Journal articles on the topic 'Coal gasification'
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1
Dhawan, Heena, Rohit Kumar, Sreedevi Upadhyayula, K. K. Pant, and D. K. Sharma. "Fractionation of coal through organo-separative refining for enhancing its potential for the CO2-gasification." International Journal of Coal Science & Technology 7, no. 3 (July 29, 2020): 504–15. http://dx.doi.org/10.1007/s40789-020-00348-7.
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Abstract Coal gasification has already been extensively studied earlier under varying conditions of steam, CO2, O2, inert conditions. Belbaid coal and its e, N and NMP-DETA SCC products recovered through organo-refining under milder ambient pressure conditions were subjected to CO2-gasification in a fixed bed reactor under varying conditions. CO2 being an inert gas becomes the most challenging to be utilized during the gasification process. The SCCs showed better CO2-gasification reactivity than the raw Belbaid coal at 900 °C. The use of the catalyst K2CO3 tremendously increased the gasification reactivity for both raw coal and the SCCs. The use of sugarcane bagasse for CO2-gasification along with raw coal as well as with residual coal was also studied. Gasification under CO2 atmosphere conditions was used to structurally understand the coals as the coal structure gets loosened after extraction.
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Li, Han Xu, Xiang Cao, and Yong Xin Tang. "Study of Effect of Ternary-Component Blended Coal on Coal Gasification Reaction at High Temperature." Applied Mechanics and Materials 295-298 (February 2013): 3104–9. http://dx.doi.org/10.4028/www.scientific.net/amm.295-298.3104.
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Three typical Chinese individual coals which existed remarkable difference on coal ash chemical composition and ash fusion temperature were selected to carry out coal blending experiments to study the coal gasification reaction at high temperature by means of using ternary-component blended coal technique and TGA-DTA method. According to ternary-component blended coal with a certain proportion, ash chemical composition and coal-char/CO2 gasification reactivity were analyzed by X-ray fluorescence (XRF) and thermogravimetric analysis-derivative thermogravimetric analysis (TGA-DTG), respectively. The results show that the ash chemical components change because ternary-component blended coals change the mineral composition, and hence, the gasification reactivity can be affected as well. Moreover, in accordance with reactivity index R, it indicates that the order of gasification reactivity of three individual coals and four blended coal options is coal x > option B > option A > option D > option C > coal z >coal y. Meanwhile, a new mathematical model called per unit ash alkali index B* was established by using the ash chemical component dates, which has a good corresponding relationship with R for four blending coal options. Utilizing ternary-component blended coal technique could improve the high-temperature coal ash gasification reaction.
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Zhao, Li Hong, Xi Jie Chu, and Shao Juan Cheng. "Sulfur Transfers from Pyrolysis and Gasification of Coal." Advanced Materials Research 512-515 (May 2012): 2526–30. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.2526.
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The sulfur transformation during pyrolysis and gasification of three kinds of coals was studied and the release of H2S and COS during the process was examined. During pyrolysis, besides the property of coal, reaction temperature is the most important factor that affects the sulfur removal. The main sulfur-containing gases is H2S, the ratio of sulfur-containing gases amount to total sulfur amount in coal reaches 25.8% for LS coal, 31.8% for YT coal and 13.1% for HJ coal, respectively. During CO2 gasification, compared with pyrolysis and steam gasification, there are more COS and less H2S formation, because CO could react with sulfide to form COS. During steam gasification, only H2S formation and no COS detected, because H2 has stronger reducibility to form H2S than CO. And the formation rate of sulfur during gasification is consistent with the gasification reactivity of three coal chars, indicated that coal rank is the major factor which affects the sulfur distribution during gasification.
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Kapusta, Krzysztof, Marian Wiatowski, Krzysztof Stańczyk, Renato Zagorščak, and Hywel Rhys Thomas. "Large-scale Experimental Investigations to Evaluate the Feasibility of Producing Methane-Rich Gas (SNG) through Underground Coal Gasification Process. Effect of Coal Rank and Gasification Pressure." Energies 13, no. 6 (March 13, 2020): 1334. http://dx.doi.org/10.3390/en13061334.
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An experimental campaign on the methane-oriented underground coal gasification (UCG) process was carried out in a large-scale laboratory installation. Two different types of coal were used for the oxygen/steam blown experiments, i.e., “Six Feet” semi-anthracite (Wales) and “Wesoła” hard coal (Poland). Four multi-day gasification tests (96 h continuous processes) were conducted in artificially created coal seams under two distinct pressure regimes-20 and 40 bar. The experiments demonstrated that the methane yields are significantly dependent on both the properties of coal (coal rank) and the pressure regime. The average CH4 concentration for “Six Feet” semi-anthracite was 15.8%vol. at 20 bar and 19.1%vol. at 40 bar. During the gasification of “Wesoła” coal, the methane concentrations were 10.9%vol. and 14.8%vol. at 20 and 40 bar, respectively. The “Six Feet” coal gasification was characterized by much higher energy efficiency than gasification of the “Wesoła” coal and for both tested coals, the efficiency increased with gasification pressure. The maximum energy efficiency of 71.6% was obtained for “Six Feet” coal at 40 bar. A positive effect of the increase in gasification pressure on the stabilization of the quantitative parameters of UCG gas was demonstrated.
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Yin, Zhenyong, Hao Xu, Yanpen Chen, and Tiantian Zhao. "Coal char characteristics variation in the gasification process and its influencing factors." Energy Exploration & Exploitation 38, no. 5 (July 27, 2020): 1559–73. http://dx.doi.org/10.1177/0144598720935523.
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Underground coal gasification is a burgeoning coal exploitation technique that coal is directly converted into gaseous fuel by controlled combustion. In this paper, the gasification experiments of Inner Mongolia lignite, Xinjiang subbituminous coal, and Hancheng medium volatile bitumite were conducted respectively by using the tube furnace coal gasification experiment system. The gasification process was conducted under 3°C/min increment within the range of 600–900°C. The gas composition was analyzed by gas chromatography and the pore structure of the coal char was detected by low-temperature N2 adsorption. The results show that the gasification temperature, gasification agent, and coal type have an important influence on the gasification reaction. With the increase of gasification temperature, the effective component, gas calorific value, and gas production rate increase. When CO2 is used as the gasifying agent, the effective components in the gas are mainly CO. When H2O(g) is used as the gasifying agent, the effective component of gas is H2. The coal gasification performance with low thermal maturity is obvious better than the high rank coal with higher coalification. N2 adsorption–desorption experiments show that the pore is mainly composed by transition pore and the micropores, the specific surface area is chiefly controlled by a pore size of 2–3 nm. With the increase of coalification degree, the adsorption amount, specific surface area, and total pore volume show a decreasing trend. The gasifying agent has a great influence on the pore structure of the coal char. The gasification effect of H2O (g) is significantly better than that of CO2. Analyzing the gasification characteristics and pore changes of different coal rank coals under different gasification agents, we found that Inner Mongolia lignite is more conducive to the transport of gasification agents and gaseous products in coal.
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Wiatowski, Marian, Krzysztof Kapusta, Aleksandra Strugała-Wilczek, Krzysztof Stańczyk, Alberto Castro-Muñiz, Fabián Suárez-García, and Juan Ignacio Paredes. "Large-Scale Experimental Simulations of In Situ Coal Gasification in Terms of Process Efficiency and Physicochemical Properties of Process By-Products." Energies 16, no. 11 (May 31, 2023): 4455. http://dx.doi.org/10.3390/en16114455.
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This paper presents a series of surface experiments simulating underground coal gasification (UCG). The main goal of the experiments was to investigate the influence of the gasification medium and the coal rank on the gasification process. Four multi-day trials were carried out using a laboratory gasification facility designed for the large-scale experimental simulations of UCG and located in the Experimental Mine “Barbara”, located at Mikołów, Poland. Two Polish bituminous coals were investigated: coal sourced from “Piast-Ziemowit” mine and coal sourced from “Wesoła” mine. Each of the two coals was gasified in two separate experiments using oxygen-enriched air (OEA) and pure oxygen as the respective gasifying agents. Gasification with oxygen resulted in significantly higher gas quality and higher process efficiency than gasification with OEA. Higher concentrations of hydrogen (23.2% and 25.5%) and carbon monoxide (31.8% and 33.4%) were obtained when oxygen was used as a gasifying reagent, while lower concentrations were obtained in the case of gasification with OEA (7.1% and 9.5% of hydrogen; 6.4% and 19.7% of carbon monoxide). Average gas calorific values were 7.96 MJ/Nm3 and 9.14 MJ/Nm3 for the oxygen experiments, compared to 2.25 MJ/Nm3 and 3.44 MJ/Nm3 for the OEA experiments (“Piast-Ziemowit” coal and “Wesoła” coal, respectively). The higher coalification degree of “Wesoła” coal (82.01% of carbon) compared to the “Piast-Ziemowit” coal (68.62% of carbon) definitely improves the gas quality and energy efficiency of the process. The rate of water condensate production was higher for the oxygen gasification process (5.01 kg/h and 3.63 kg/h) compared to the OEA gasification process (4.18 kg/h and 2.63 kg/h, respectively), regardless of the type of gasified coal. Additionally, the textural characteristics (porosity development) of the chars remaining after coal gasification experiments were analyzed. A noticeable development of pores larger than 0.7 nm was only observed for the less coalified “Piast-Ziemowit” coal when analyzed under the more reactive atmosphere of oxygen.
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Kačur, Ján, Marek Laciak, Milan Durdán, and Patrik Flegner. "Investigation of Underground Coal Gasification in Laboratory Conditions: A Review of Recent Research." Energies 16, no. 17 (August 28, 2023): 6250. http://dx.doi.org/10.3390/en16176250.
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The underground coal gasification (UCG) technology converts coal into product gas and provides the option of environmentally and economically attractive coal mining. Obtained syngas can be used for heating, electricity, or chemical production. Numerous laboratory coal gasification trials have been performed in the academic and industrial fields. Lab-scale tests can provide insight into the processes involved with UCG. Many tests with UCG have been performed on ex situ reactors, where different UCG techniques, the effect of gasification agents, their flow rates, pressures, and various control mechanisms to improve gasification efficiency and syngas production have been investigated. This paper provides an overview of recent research on UCG performed on a lab scale. The study focuses on UCG control variables and their optimization, the effect of gasification agents and operating pressure, and it discusses results from the gasification of various lignites and hard coals, the possibilities of steam gasification, hydrogen, and methane-oriented coal gasification, approaches in temperature modeling, changes in coal properties during gasification, and environmental risks of UCG. The review focuses on laboratory tests of UCG on ex situ reactors, results, and the possibility of knowledge transfer to in situ operation.
8
Bielowicz, Barbara, and Jacek Misiak. "The Impact of Coal’s Petrographic Composition on Its Suitability for the Gasification Process: The Example of Polish Deposits." Resources 9, no. 9 (September 9, 2020): 111. http://dx.doi.org/10.3390/resources9090111.
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In this paper, we discuss the impact of the rank of coal, petrographic composition, and physico-chemical coal properties on the release and composition of syngas during coal gasification in a CO2 atmosphere. This study used humic coals (parabituminous to anthracite) and lithotypes (bright coal and dull coal). Gasification was performed at temperatures between 600 and 1100 °C. It was found that the gas release depends on the temperature and rank of coal, and the reactivity increases with the increasing rank of coal. It was shown that the coal lithotype does not affect the gas composition or the process. Until 900 °C, the most intense processes were observed for higher rank coals. Above 1000 °C, the most reactive coals had a vitrinite reflectance of 0.5–0.6%. It was confirmed that the gasification of low-rank coal should be performed at temperatures above 1000 °C, and the reactivity of coal depends on the petrographic composition and physico-chemical features. It was shown that inertinite has a negative impact on the H2 content; at 950 °C, the increase in H2 depends on the rank of coal and vitrinite content. The physicochemical properties of coal rely on the content of maceral groups and the rank of coal. An improved understanding these relationships will allow the optimal selection of coal for gasification.
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Zhao, Li Hong, Xi Jie Chu, and Shao Juan Cheng. "Kinetic Study of CO2 Gasification of Coal Chars." Advanced Materials Research 550-553 (July 2012): 2754–57. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.2754.
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The CO2 gasification of three coal chars were investigated for determining the gasification reactivity and the kinetic parameters. Experiments were conducted in a fluidized-bed reactor at temperature of 1173 k, 1273 k and 1373 k at atmospheric pressure. Gasification kinetic parameters of the samples were determined using Homogeneous model and shrinking-core model. It is found that the gasification reaction under chemical-reaction-rate control, the gasification reactivity of coal char are strongly dependent on the rank of coals and gasification temperature. Both models could describe CO2 gasification equally well, these kinetic values are comparable with the reported in the literature for the other chars under chemical control conditions.
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Hotchkiss, R. "Coal gasification technologies." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 217, no. 1 (February 1, 2003): 27–33. http://dx.doi.org/10.1243/095765003321148664.
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This paper reviews coal gasification processes and technology. Sources of more detailed information in specific areas are suggested. The merits and disadvantages of incorporating coal gasification into power generation plants are discussed. The recent history of coal gasification technology and the current state of projects are summarized. The potential for large-scale coal gasification, small-scale coal gasification and cogasification of coal with biomass and/or wastes in the current economic climate is discussed.
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Dai, Fei, Shengping Zhang, Yuanpei Luo, Ke Wang, Yanrong Liu, and Xiaoyan Ji. "Recent Progress on Hydrogen-Rich Syngas Production from Coal Gasification." Processes 11, no. 6 (June 9, 2023): 1765. http://dx.doi.org/10.3390/pr11061765.
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Coal gasification is recognized as the core technology of clean coal utilization that exhibits significant advantages in hydrogen-rich syngas production and CO2 emission reduction. This review briefly discusses the recent research progress on various coal gasification techniques, including conventional coal gasification (fixed bed, fluidized bed, and entrained bed gasification) and relatively new coal gasification (supercritical water gasification, plasma gasification, chemical-looping gasification, and decoupling gasification) in terms of their gasifiers, process parameters (such as coal type, temperature, pressure, gasification agents, catalysts, etc.), advantages, and challenges. The capacity and potential of hydrogen production through different coal gasification technologies are also systematically analyzed. In this regard, the decoupling gasification technology based on pyrolysis, coal char–CO2 gasification, and CO shift reaction shows remarkable features in improving comprehensive utilization of coal, low-energy capture and conversion of CO2, as well as efficient hydrogen production. As the key unit of decoupling gasification, this work also reviews recent research advances (2019–2023) in coal char–CO2 gasification, the influence of different factors such as coal type, gasification agent composition, temperature, pressure, particle size, and catalyst on the char–CO2 gasification performance are studied, and its reaction kinetics are also outlined. This review serves as guidance for further excavating the potential of gasification technology in promoting clean fuel production and mitigating greenhouse gas emissions.
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Hao, Jia, and Qi Min Wang. "The Interaction Mechanism of Biomass and Coal Co-Gasification." Advanced Materials Research 724-725 (August 2013): 330–33. http://dx.doi.org/10.4028/www.scientific.net/amr.724-725.330.
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The development of biomass and coal co-gasification technology not only helps to alleviate the energyshortage crisis, but also reduces the pollution of fossil fuels to ecological environment. Co-gasification of biomass and coal can overcome in a certain extent tar emerge in biomass gasification, alkali chloride corrosion, low reaction temperature etc, can increase the calorific value of the gasified gas, can also improve the gasification characteristics. However, due to the biomass compositions differences and the gasification technologies differences, there are the different studies results of co-gasification of biomass and coal. This paper summarized and analyzed the biomass and coal co-gasification study literatures, it is conclude that the biomass compositions can enhance the coal gasification reaction if the biomass compositions intensive mixed with the coal compositions. If not, the biomass gasification and the coal gasification would react separately. This conclusion provides a theoretical basis of the biomass and coal co-gasification and accelerates the biomass gasification technologies development.
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Md Isa, Kamariah, Kahar Osman, Nik Rosli Abdullah, Nor Fadzilah Othman, and Nurulnatisya Ahmad. "Coal Type, Temperature and Gasifiying Agent Effects on Low-Rank Coal Gasification Using CFD Method." CFD Letters 12, no. 10 (November 1, 2020): 111–27. http://dx.doi.org/10.37934/cfdl.12.10.111127.
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Low-Rank Coal (LRC) gasification utilising Fluidised Bed Gasifier (FBG) is more efficient for LRC that has higher reactivity, moisture, tar, volatile, and ash content but lower calorific value compared to other types of coals. This work investigated the application of Computational Fluid Dynamics (CFD) in simulating LRC gasification under different temperatures which is lower (873K), normal (973K) and higher (1073K) temperature atmosphere. Besides that, the effect of LRC type and gasifying agents on the producer gas CO+H2 composition, Lower Heating Value (LHV) and Cold Gas Efficiency (CGE) were also studied using High-rank Coal (HRC) as comparison. The results obtained showed that LRC gasification using oxygen increased LHV and CGE. Lower temperature gasification using oxygen at 873 increased CO+H2, LHV and CGE for LRC compared to higher temperatures at 973K and 1073K. This prediction suggests that LRC gasification using oxygen at lower temperature increases the LRC gasification efficiency.
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Chen, Jinbo, Peng Jiang, Yipei Chen, and Shuai Liu. "Investigation on Synergism and Its Influence Parameters between Coal and Biomass during Co-Gasification Based on Aspen Plus." Processes 12, no. 5 (April 30, 2024): 919. http://dx.doi.org/10.3390/pr12050919.
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The co-gasification of coal and biomass offers numerous benefits, including improved gasification efficiency, reduced pollution emissions, and the utilization of renewable resources. However, there is a lack of comprehensive research on the synergistic effects of, and influence parameters on, coal–biomass co-gasification. This study employs Aspen Plus simulations to investigate the co-gasification behavior of coal and corn straw, focusing on the synergistic effects and the impact of various operating conditions. A synergistic coefficient is defined to quantify the interactions between the feedstocks. Sensitivity analyses explore the effects of gasification temperature (800–1300 °C), coal rank (lignite, bituminous, anthracite), biomass mass fraction (0–50%), oxygen-to-carbon ratio, and steam-to-carbon ratio on the synergistic coefficients of effective syngas content (CO + H2), specific oxygen consumption, specific fuel consumption, and cold gas efficiency. The results reveal an optimal biomass mass fraction of 10% for maximizing cold gas efficiency, with the syngas primarily consisting of H2 (36.8%) and CO (61.6%). Higher gasification temperatures (up to 1200 °C) improve syngas quality and process efficiency, while higher-rank coals exhibit better gasification performance compared to lignite. Optimal oxygen-to-carbon and steam-to-carbon ratios are identified for maximizing syngas yield and quality. These findings provide valuable guidance for the design and optimization of industrial coal–biomass co-gasification processes, enabling the maximization of syngas quality, process efficiency, and resource utilization.
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Slobodyanyuk, V. Р., S. О. Shlapak, O. В. Tselishchev, S. О. Kudryavtsev, M. G. Loriia, and O. A. Duryshev. "Development of a laboratory unit and a solid fuel gasification reactor." Вісник Східноукраїнського національного університету імені Володимира Даля, no. 1 (281) (February 14, 2024): 98–101. http://dx.doi.org/10.33216/1998-7927-2024-281-1-98-101.
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The paper investigates the process of gasification of pyrolysis coal and other coal-containing materials A schematic diagram of the installation of the gasification process of pyrolysis coal and other coal-containing materials was developed, the design of the reactor for coal gasification and the methodology for conducting experiments and analysing the gasification process of pyrolysis coal and other coal-containing materials were developed. Research methods - modelling of the coal gasification process using the results of theoretical studies. A detailed analysis of the experimental and theoretical data concerning the feasibility of the pyrolysis coal gasification process was carried out, a schematic diagram of the laboratory installation and the design of the gasification reactor were developed. The main goal is to develop a method of gasification of solid pulverised fuel that will simplify the process control and ensure its stability due to the unity of the drying and gasification processes of pyrolysis coal, which are linked by means of a gasification reactor. Additionally, this method provides for the neutralisation of harmful impurities generated during the coal gasification process. As a result of theoretical studies of the solid fuel gasification process, a design of a coal gasification reactor was proposed, which is an ideal displacement reactor. The length-diameter ratio for the working part of the reactor should be at least 10:1. It is proposed to use a heat-resistant molybdenum steel tube (operating temperature up to 1600 0C) with a diameter of two inches to manufacture the reactor. Also, to study the gasification process of pyrolysis coal and other coal-containing materials, a laboratory installation for gasification of solid crushed fuel is proposed, in which a gas mixture of carbon dioxide and oxygen is fed into the reactor and serves as an activator of the gasification process. The prospects of coal processing by gasification to produce a mixture of combustible gases (H2, CO, CH4) are investigated. It is analysed that coal gasification allows obtaining valuable gas that can be used not only as an energy fuel, but also as a technological raw material for the production of methanol, dimethyl ether, hydrogen production, and use as a reducing agent in metallurgical processes.
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El-Tawil, Asmaa A., Bo Björkman, Maria Lundgren, Frida Bäck, and Lena Sundqvist Ökvist. "Influence of Modified Bio-Coals on Carbonization and Bio-Coke Reactivity." Metals 12, no. 1 (December 28, 2021): 61. http://dx.doi.org/10.3390/met12010061.
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Substitution of coal in coking coal blend with bio-coal is a potential way to reduce fossil CO2 emissions from iron and steelmaking. The current study aims to explore possible means to counteract negative influence from bio-coal in cokemaking. Washing and kaolin coating of bio-coals were conducted to remove or bind part of the compounds in the bio-coal ash that catalyzes the gasification of coke with CO2. To further explore how the increase in coke reactivity is related to more reactive carbon in bio-coal or catalytic oxides in bio-coal ash, ash was produced from a corresponding amount of bio-coal and added to the coking coal blend for carbonization. The reaction behavior of coals and bio-coals under carbonization conditions was studied in a thermogravimetric analyzer equipped with a mass spectrometer during carbonization. The impact of the bio-coal addition on the fluidity of the coking coal blend was studied in optical dilatometer tests for coking coal blends with and without the addition of bio-coal or bio-coal ash. The result shows that the washing of bio-coal will result in lower or even negative dilatation. The washing of bio-coals containing a higher amount of catalytic components will reduce the negative effect on bio-coke reactivity, especially with acetic acid washing when the start of gasification temperature is less lowered. The addition of bio-coal coated with 5% kaolin do not significantly lower the dilatation-relative reference coking coal blend. The reactivity of bio-cokes containing bio-coal coated with kaolin-containing potassium oxide was higher in comparison to bio-coke containing the original bio-coal. The addition of ash from 5% of torrefied bio-coals has a moderate effect on lowering the start of gasification temperature, which indicates that the reactive carbon originating from bio-coal has a larger impact.
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Chai, Yi-fan, Guo-ping Luo, Sheng-li An, Jun Peng, and Yi-ci Wang. "Influence of unburned pulverized coal on gasification reaction of coke in blast furnace." High Temperature Materials and Processes 38, no. 2019 (February 25, 2019): 733–38. http://dx.doi.org/10.1515/htmp-2019-0016.
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AbstractIn order to explore the influence of unburned pulverized coal on gasification reaction of coke in blast furnace, kinetic rules of gasification reaction between CO2 and coke powder adding pulverized coals with different volatiles were studied by thermogravimetric analysis. The results showed that weight-loss ratio of samples reacted with CO2 increased after adding pulverized coal, and the weight-loss ratio rose with the increase of coal’s addition. When the content of pulverized coal was up to 50%, the weight-loss ratio of the sample which adding pulverized coal with high volatile was higher under the same temperature. The activation energy about C-CO2 gasification reaction of samples reduced observably after adding pulverized coal. The activation energy of samples had a largest decrease with 83.408 kJ mol−1 at the range of 1223 K~1373 K and it was 28.97 kJ mol−1 at the range of 1373 K~1523 K. The addition of pulverized coal with high volatile can reduce the reaction activation energy of samples more effectively. In the soft melting zone, the gasification reaction model of coke blocks attached the unburned pulverized coal was up to unreacted core model and porous volume-reacted model jointly.
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Yu, Hai Long, Feng Kun Wang, Gui Fang Zhang, and Jian Zhong Liu. "Numerical Simulation of Coal Oil Water Slurry Gasification Process in New-Type Coal Water Slurry Gasifier." Applied Mechanics and Materials 229-231 (November 2012): 2501–5. http://dx.doi.org/10.4028/www.scientific.net/amm.229-231.2501.
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The gasification process of coal oil water (COW) slurry in new-type coal water slurry(CWS) gasification furnace was studied with numerical simulation method. The temperature and concentration fields were obtained for the gasification furnace. The simulated results showed that the gasification effect of the new-type coal water slurry gasification is better than the common coal water slurry gasification. In the new-type gasification furnace, the average temperature is slightly increased and the carbon translative ratio is increased by 1.81%. The effective component (CO+H2) in coal gas at the outlet of the furnace is increased by 10.58%, and the concentration of CO2and H2O is greatly decreased. The H2O dissolution ratio is greatly increased and the gasification effect is obviously better that that of the common coal water slurry.
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Othman, Nor Fadzilah, and Mohd Hariffin Bosrooh. "GASIFICATION STUDY OF SARAWAK COALS." ASEAN Journal on Science and Technology for Development 25, no. 1 (November 19, 2017): 67–72. http://dx.doi.org/10.29037/ajstd.232.
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Thermogravimetry (TG) has been applied in a preliminary investigation, to the gasification of two low rank Sarawak coals. The coal samples, about 10 mg were investigated within the temperature range 30–900°C at different heating rate of 10, 20 and 30°C min-1, under a synthetic air atmosphere for the gasification study. The kinetic parameters were determined using Arrhenius type reaction model assuming a first-order reaction. The reactivity, RT values are fitted with Arrhenius equation at r2 = 0.83 - 0.98 for MP coal, while the RT values for MB coal are fitted with the Arrhenius equation at r2 = 0.99. The activation energy, EA for MP coal are in the range of 3.7 -4.7 kJ mol-1 and for MB coal are 7.6 - 25.6 kJ mol-1 at 3 different heating rates.
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Liu, Lang, Qingrui Jiao, Jian Yang, Bowen Kong, Shan Ren, and Qingcai Liu. "Influences of Ash-Existing Environments and Coal Structures on CO2 Gasification Characteristics of Tri-High Coal." Processes 8, no. 11 (October 28, 2020): 1367. http://dx.doi.org/10.3390/pr8111367.
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Two kinds of tri-high coals were selected to determine the influences of ash-existing environments and coal structures on CO2 gasification characteristics. The TGA results showed that the gasification of ash-free coal (AFC) chars was more efficient than that of corresponding raw coal (RC) chars. To uncover the reasons, the structures of RCs and AFCs, and their char samples prepared at elevated temperatures were investigated with SEM, BET, XRD, Raman and FTIR. The BET, SEM and XRD results showed that the Ash/mineral matter is associated with coal, carbon forms the main structural framework and mineral matters are found embedded in the coal structure in the low-rank tri-high coal. The Raman and FTIR results show that the ash can hinder volatile matters from exposing to the coal particles. Those results indicate that the surface of AFC chars has more free active carbon sites than raw coal chars, which are favorable for mass transfer between C and CO2, thereby improving reactivity of the AFC chars. However, the gasification reactivity was dominated by pore structure at elevated gasification temperatures, even though the microcrystalline structure, functional group structure, and increase in the disorder carbon were improved by acid pickling.
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Abdullah, Ragimun, Haula Rosdiana, and Milla Sepliana Setyowati. "Strengthening of the Coal-Gasification Industry: Evidence from Indonesia." Journal of Economics and Behavioral Studies 13, no. 5(J) (November 9, 2021): 55–62. http://dx.doi.org/10.22610/jebs.v13i5(j).3221.
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The purpose of this research is to analyze Indonesia's coal-gasification industry policy. This research needs to map the undeveloped coal-gasification industry. In fact, the coal-gasification industry can increase the economic value of coal, increase local income, absorb the labor force, and reduce pollution. It also has some strategic roles in national fiscal revenue and foreign exchange reserves and is of great significance to regional development. The research methods used are quantitative and qualitative. The results of this study indicate that government needs to provide some financial incentives for the coal-gasification industries, especially for pioneer companies for having coal-gasification works, and ensure that policies taken will be able to encourage economic growth and investment in Indonesia’s coal-gasification industry. To support investment in the coal-gasification industry, it is necessary to formulate policies and rules to provide a sign for its implementation.
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Bielowicz, Barbara. "Petrographic Characteristics of Coal Gasification and Combustion by-Products from High Volatile Bituminous Coal." Energies 13, no. 17 (August 25, 2020): 4374. http://dx.doi.org/10.3390/en13174374.
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The coal was gasified in a fluidized bed reactor with CO2 as a gasifying agent at 889–980 °C. The coal and gasification residue produced during gasification was burned at temperatures up to 900 °C. The petrographic analysis, gasification residues, and fly and bottom ash resulting from the combustion of coal and chars showed the efficiency of the gasification and combustion processes. The gasification residue primarily comprised inertoids and crassinetwork, which accounted for 60% of the sample. The analysis of the petrographic composition of fly ash revealed that the fly ash formed during the combustion of gasification residue had a higher mineral content. The fly ash from the combustion of gasification products contained significantly less unburned coal compared to that from coal. The samples of the bottom ash from coal combustion were composed of approximately 25% organic matter, most of which was chars. The bottom ash formed from the combustion of coal gasification products was composed mainly of mineral matter (95% or higher). The obtained results have significant implications in determining future waste management strategies.
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Zhang, Zeyi, and Yingjuan Shao. "Simulation of co-production system based on coal partial gasification under different reactant gas atmospheres." E3S Web of Conferences 385 (2023): 02029. http://dx.doi.org/10.1051/e3sconf/202338502029.
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In order to explore the comparison of coal partial gasification hydrogen-electricity cogeneration systems under different gasification agent atmospheres, based coal partial gasification, including steam cycle power generation and syngas processing for hydrogen production, a hydrogen-electric co-production system and its model of partial coal gasification and semi-coke combustion are constructed, respectively using (H2O/O2) and (CO2/O2) as gasification reactant gas. The effects of oxygen-coal ratio and carbon conversion on exergy efficiency and syngas composition under different gasification reaction gas atmospheres were studied by Aspen Plus simulation. The exergy efficiency under different gasification agent atmospheres increases first and then decreases with the increase of oxygen-coal ratio and carbon conversion rate. Using (CO2/O2) as gasification agent has higher exergy efficiency. The composition of syngas changes little under different oxygen-coal ratios, while the overall content of H2, CO and CH4 in syngas will increase with the increase of carbon conversion rate, but the growth rate will continue to decline.
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Ariunaa, A., D. Bernhardt, M. Beckmann, K. Gebauer, N. Hack, A. Seifert, R. Fischer, S. Unz, J. Narangerel, and B. Purevsuren. "Research on the thermal decomposition of Mongolian Baganuur lignite and Naryn sukhait bituminous coal." Mongolian Journal of Chemistry 16 (March 22, 2016): 22–29. http://dx.doi.org/10.5564/mjc.v16i0.665.
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The technical characteristics, elemental composition of the organic and mineral matters, ash melting behaviors and carbonization and gasification reactivities of coals from Baganuur and Naryn sukhait deposits were investigated. The results of proximate and ultimate analysis confirmed that the coal from Baganuur deposit can be graded as a low rank lignite B2 mark coal and Naryn sukhait coal is a bituminous G mark one. The carbonization and gasification experiments were performed using TGA apparatus and fixed bed quartz reactor. The data obtained with two experimental reactors showed that Baganuur lignite had lower thermal stability and much higher CO2 gasification reactivity at 950°C as compared to those for Naryn sukhait bituminous coal.Mongolian Journal of Chemistry 16 (42), 2015, 22-29
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Gordienko, M. O. "The selection of technological basis of deep processing of coal." Journal of Coal Chemistry 4 (2021): 15–21. http://dx.doi.org/10.31081/1681-309x-2021-0-4-15-21.
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THE SELECTION OF TECHNOLOGICAL BASIS OF DEEP PROCESSING OF COAL © M.O. Gordienko (State Enterprise "Ukrainian State Research Coal Chemical Institute (UHIN)", 61023, Kharkov, Vesnina st., 7, Ukraine) The article is devoted to the analysis of the possibility of expanding the raw material base of thermal energy, as well as meeting the demand for motor fuels and chemical products through the thermochemical processing of coal, the reserves of which are large enough and available for extraction and transportation. Moreover, in contrast to technologies such as methanization and liquefaction, the most promising type of deep processing of coal seems to be its gasification. This process is carried out in sealed devices of high power according to the technologies that have a long history of improvement on an industrial scale by the world's leading companies. It was emphasized that Ukraine has significant reserves of low-calorie coal (constantly expanding due to waste of coal preparation), the thermochemical processing of which can significantly expand the domestic energy base. The basic principles of classification and technological foundations of existing industrial and industrial research installations for gasification of coal and similar materials are given. The basic diagrams and main parameters of the existing installations, which carry out the gasification process at temperatures below the melting point of the mineral (ash-forming) components of the raw material, are described - Sasol Lurgi and SES Gasification Technology (SGT). Based on the data on the world experience in the operation of thermochemical coal processing units, it is shown that low-temperature (carried out at a temperature below the melting point of the mineral ashforming components) gasification of various types of non-coking coal with certain technological solutions can be no less effective than more complex and expensive high-temperature technologies. There are grounds for believing that the efficiency of gasification with ash removal in a solid state can be further increased by using some of the technological capabilities available in coke production. Keywords: brown coal, non-coking coals, thermochemical processing, gasification, efficiency, degree of carbon conversion, energy carriers, synthesis gas, environmental safety. Corresponding author M.O. Gordienko, е-mail: yo@ukhin.org.ua
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Gordienko, M. O. "The selection of technological basis of deep processing of coal." Journal of Coal Chemistry 4 (2021): 15–21. http://dx.doi.org/10.31081/1681-309x-2021-0-4-15-21.
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THE SELECTION OF TECHNOLOGICAL BASIS OF DEEP PROCESSING OF COAL © M.O. Gordienko (State Enterprise "Ukrainian State Research Coal Chemical Institute (UHIN)", 61023, Kharkov, Vesnina st., 7, Ukraine) The article is devoted to the analysis of the possibility of expanding the raw material base of thermal energy, as well as meeting the demand for motor fuels and chemical products through the thermochemical processing of coal, the reserves of which are large enough and available for extraction and transportation. Moreover, in contrast to technologies such as methanization and liquefaction, the most promising type of deep processing of coal seems to be its gasification. This process is carried out in sealed devices of high power according to the technologies that have a long history of improvement on an industrial scale by the world's leading companies. It was emphasized that Ukraine has significant reserves of low-calorie coal (constantly expanding due to waste of coal preparation), the thermochemical processing of which can significantly expand the domestic energy base. The basic principles of classification and technological foundations of existing industrial and industrial research installations for gasification of coal and similar materials are given. The basic diagrams and main parameters of the existing installations, which carry out the gasification process at temperatures below the melting point of the mineral (ash-forming) components of the raw material, are described - Sasol Lurgi and SES Gasification Technology (SGT). Based on the data on the world experience in the operation of thermochemical coal processing units, it is shown that low-temperature (carried out at a temperature below the melting point of the mineral ashforming components) gasification of various types of non-coking coal with certain technological solutions can be no less effective than more complex and expensive high-temperature technologies. There are grounds for believing that the efficiency of gasification with ash removal in a solid state can be further increased by using some of the technological capabilities available in coke production. Keywords: brown coal, non-coking coals, thermochemical processing, gasification, efficiency, degree of carbon conversion, energy carriers, synthesis gas, environmental safety. Corresponding author M.O. Gordienko, е-mail: yo@ukhin.org.ua
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Chen, Junwei, Weibin Chen, Yang Jiao, and Xidong Wang. "Gasification Kinetics of Bituminous Coal Char in the Mixture of CO2, H2O, CO, and H2." Energies 12, no. 3 (February 4, 2019): 496. http://dx.doi.org/10.3390/en12030496.
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The gasification kinetics of bituminous coal char was investigated in a mixture of CO2, H2O, CO, H2, and N2 under isothermal conditions. In addition, the impacts of gasification temperature, gasification time, and gas composition on the gasification process were analyzed. As the experimental results suggest, there is a significant increase of the carbon conversion degree of bituminous coal char not just when gasification temperature and time increase, but also when H2 and CO concentration decreases. The kinetics of bituminous coal char in the gasification process was successfully modeled as a shrinking unreacted core. It is concluded that the gasification of bituminous coal char is controlled by an internal chemical reaction in the early stage and diffusion in the later stage. The activation energies of bituminous coal char gasification for different stages were studied. Moreover, it is proposed for the first time, to our knowledge, that the diffusion-control step is significantly shortened with the decrease of the CO2/H2O ratio. As scanning-electron-microscopy results suggest, bituminous coal char gasified in CO2/H2O = 1/3 atmosphere has numerous inner pores (0–5 m). Therefore, in the process of gasification, the inner pores provide a gas channel that reduces the gas diffusion resistance and thus shortens the diffusion-control step. These results can serve as a reference for industrialized application of the technology of coal gasification direct reduced iron.
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Odineze, M. C., and J. A. Olowokere. "Kinetic Study and Modeling of Nigerian Sub Bituminous Coal Char Using the Random Pore Technique." Journal of Engineering Research and Reports 25, no. 9 (September 25, 2023): 28–38. http://dx.doi.org/10.9734/jerr/2023/v25i9978.
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Inorder to augment for the short supply of energy for industrial purposes, the kinetics of carbon-dioxide gasification of two Nigerian sub bituminous coal chars was studied in this work using a thermogravimetric analyser (TGA). This paper, reports the findings on gasification of typical Enugu (Udi) and Kogi (Okaba) coal of Nigeria in carbon dioxide medium at atmospheric pressure. Proximate and ultimate analysis was performed on the coal samples based on their origin to determine their properties and values. Result shows that Udi coal has a higher heating value as compared to Okaba coal. The effect of the temperature of gasification ranging from 900oC to 1000oC at different concentration of carbon dioxide of 100%, 70% and 40% at atmospheric pressure was studied. The gasification process of coal involves pyrolysis and char gasification. It was found that the reactivity of char gasification increased with the increase of pyrolysis heating rate, which demonstrate the effect of temperature on gasification. A random pore model approach with a novel kinetic scheme was used to describe the behaviour of the coal char. The simulated predictive model result was compared with the observed experimental result, which were in good agreement. Based on the obtained result, it was observed that the rate of carbon conversion increases with increase in concentration of carbon dioxide over time, and vice versa. The activation energy for the coal samples vary depending on their origin and were found to be 97.58kJ/mol and 103kJ/mol for Kogi coal and Enugu coal respectively. Products of coal gasification will serve as a promising fuel alternative.
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Petrovic, David, Dusko Djukanovic, Dragana Petrovic, and Igor Svrkota. "Contribution to creating a mathematical model of underground coal gasification process." Thermal Science 23, no. 5 Part B (2019): 3275–82. http://dx.doi.org/10.2298/tsci180316155p.
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Underground coal gasification, as an auto thermal process, includes processes of degasification, pyrolysis, and the gasification itself. These processes occur as a result of a high temperature and the management of coal combustion during addition of gasification agent. Air, water vapor mixed with air, air or water vapor enriched with oxygen, or pure oxygen, may be used as gasification agents. Resulting gas that is extracted in this process may vary in chemical composition, so it is necessary to adjust it. That is the reason why it is necessary to develop a mathematical model of the underground gasification process prior to any operations in coal deposit, in order to obtain as much accurate prediction of the process as possible. Numerical calculation provides prediction of gas mixture?s chemical composition, which enables calculation of gas components? energy contents and total energy content of the gas in predicted underground coal gasification process. It is one of the main criteria in the economic assessment of underground coal gasification process. This paper, based on available data on researches in this area, provides a contribution to creation of mathematical model of underground coal gasification.
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Zheng, Shu, Yixiang Shi, Zhiqi Wang, Pengjie Wang, Gang Liu, and Huaichun Zhou. "Development of new technology for coal gasification purification and research on the formation mechanism of pollutants." International Journal of Coal Science & Technology 8, no. 3 (May 7, 2021): 335–48. http://dx.doi.org/10.1007/s40789-021-00420-w.
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AbstractCoal-fired power generation is the main source of CO2 emission in China. To solve the problems of declined efficiency and increased costs caused by CO2 capture in coal-fired power systems, an integrated gasification fuel cell (IGFC) power generation technology was developed. The interaction mechanisms among coal gasification and purification, fuel cell and other components were further studied for IGFCs. Towards the direction of coal gasification and purification, we studied gasification reaction characteristics of ultrafine coal particles, ash melting characteristics and their effects on coal gasification reactions, the formation mechanism of pollutants. We further develop an elevated temperature/pressure swing adsorption rig for simultaneous H2S and CO2 removals. The results show the validity of the Miura-Maki model to describe the gasification of Shenhua bituminous coal with a good fit between the predicted DTG curves and experimental data. The designed 8–6–1 cycle procedure can effectively remove CO2 and H2S simultaneously with removal rate over 99.9%. In addition, transition metal oxides used as mercury removal adsorbents in coal gasified syngas were shown with great potential. The techniques presented in this paper can improve the gasification efficiency and reduce the formation of pollutants in IGFCs.
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Wei, Minghui, Yilin He, Aihua Deng, and Qiuyang Tao. "Research on Temperature Simulation of Underground Coal Gasification Wellbore." Academic Journal of Science and Technology 8, no. 3 (December 28, 2023): 81–89. http://dx.doi.org/10.54097/7et0jy56.
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This study aims to integrate the theoretical distribution calculation of temperature and pressure during the gasification process through the derivation of heat conduction, thermal radiation and pressure control theory in the underground coal gasification process, and analyze the temperature of the underground coal gasification process through finite element modeling. Field influencing factors and pressure changes over time. It is of great significance to obtain the relevant parameters of the gasification chamber in the underground coal gasification process.
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Petrovic, David, Lazar Kricak, Milanka Negovanovic, Stefan Milanovic, Jovan Markovic, Nikola Simic, and Ljubisav Stamenic. "Valorization of non-balanced coal reserves in Serbia for underground coal gasification." Thermal Science 23, no. 6 Part B (2019): 4067–81. http://dx.doi.org/10.2298/tsci190725390p.
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In the name of a better and safer energy future, it is our responsibility to focus our knowledge and activities to save on imported liquid and gas fossil fuels, as well as coal on which energy security of Serbia is based. The rationalization in the use of available energy resources certainly positively affects economy and the environment of a country. This paper indicates motivations for the application of the underground coal gasification process, as well as surface gasification for Serbia. The goal is to burn less coal, while simultaneously utilizing more gas from the onsite underground coal gasification, or by gasification in various types of gas generators mounted on the surface. In both cases, from the obtained gas, CO2, NOx, and other harmful gases are extracted in scrubbers. This means that further gas combustion byproducts do not pollute the atmosphere in comparison with traditional coal combustion. In addition, complete underground coal gasification power requirements could be offset by the onsite solar photovoltaic power plant, which furthermore enhances environmental concerns of the overall coal utilization.
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Qiu, Qili, Danping Pan, Wendi Zhang, Fan Zeng, and Longlong Liu. "Catalytic Kinetics and Mechanisms of KCl with Different Concentrations on Gasification of Coal Char." Processes 10, no. 7 (July 12, 2022): 1357. http://dx.doi.org/10.3390/pr10071357.
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In this work, the influence of KCl concentration on the gasification characteristics of lignite coal char between 800–1100 °C is studied through the experiments of temperature programmed gasification and isothermal gasification using a thermogravimetric analyzer. The gasification kinetics, characteristic parameters, and the reaction mechanism of catalytic gasification is explored using the random pore model (RPM). In view of temperature programmed gasification, the gasification rate of coal char is relatively slow when the temperature is below 700 °C, and only when the temperature is higher than 700 °C, the gasification starts to accelerate. Results show that with the existence of a catalyst, the temperature required for gasification reaction is reduced and the gasification reaction rate is increased. Furthermore, the higher concentration of KCl leads to the shorter half reaction time, the higher gasification rate, and the stronger catalysis. In addition, the activation energy of AW-char (the char from acid-washed coal) is the highest, while the activation energy and the energy level required for the gasification reaction are reduced by adding KCl. Based on the analysis of the catalytic mechanism, it is found that the unified mechanism of catalytic gasification of alkali and alkaline earth metals is applicable for the KCl catalysis on coal char gasification.
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Dai, Li, and Hualin Wang. "Removal of Solid Impurities from Coal Gasification Wastewater by Sand Filtration." E3S Web of Conferences 241 (2021): 01001. http://dx.doi.org/10.1051/e3sconf/202124101001.
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Coal gasification wastewater has complex pollutant components and high COD value, and contains a variety of toxic and harmful substances. The treatment of coal gasification wastewater has always been one of the important problems in the development of coal gasification industry in China. In this paper, aiming at the removal of fine particle pollution in coal gasification wastewater, the sand filtration method was used to explore the changes of parameters such as solid content removal, separation accuracy, grade efficiency under the conditions of separating different bed thicknesses. With this separation method, the fine particle pollutants in coal gasification wastewater can be effectively removed by more than 95%, the separation accuracy can reach 0.46 μm. The operation conditions are optimized for further industrial application.
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Vamvuka, D. "Gasification of Coal." Energy Exploration & Exploitation 17, no. 6 (December 1999): 515–81. http://dx.doi.org/10.1177/014459879901700603.
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KOYAMA, Shuntaro. "Coal Gasification Technology." Journal of the Society of Mechanical Engineers 99, no. 930 (1996): 379–81. http://dx.doi.org/10.1299/jsmemag.99.930_379.
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Dave, Priyank, Dr J. K. Parikh, and S. A. Channiwala. "Design and Development of a Novel Hybrid Gasifier for High Ash Content Coal as feed stock." Journal of Research in Engineering and Applied Sciences 8, no. 2 (May 4, 2023): 518–23. http://dx.doi.org/10.46565/jreas.202382518-523.
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India has large proven reserve of coal but most of the coal has large quantity of ash. Utilization of this high ash content coal is again a verychallenging task. Presently, gasification of high ash coals has not yet been in application due to the difficulties arising from the ash handlingprocesses. In this work an attempt was made to design a partially fluidized bed reactor that can handle 30 kg/hr coal as a feedstock. By usingan appropriate design procedure a complete design of a hybrid gasifier was studied deeply. The major aim of present research is todetermine the air flow rate for proper gasification, reactor diameter and reactor height, feed particle diameter, nozzle orientation and numbernozzles, reduction zone diameter and height. Experiments were carried out with feeding rate of 9.8 kg/hr with high ash content coal having39.83% ash. Satisfactory results have been found during experiments. The average producer gas generation during trial run was found to be29.8 Nm3/hr while average calorific value of producer gas was about 4500 kJ/Nm3. The work described here favours us understand the realgasification process for high ash content coal and thus facilitates the industrial application of gasification technology.
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Green, Michael. "Recent developments and current position of underground coal gasification." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 232, no. 1 (July 23, 2017): 39–46. http://dx.doi.org/10.1177/0957650917718772.
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Underground coal gasification is a conversion and extraction process, for the production of useful synthetic product gas from an in-situ coal seam, to use in power generation, heat production or as a chemical feedstock. While many variants of the underground coal gasification process have been considered and over 75 trials performed throughout the world, the recent work has tended to focus on the control of the process, its environmental impact on underground and surface conditions and its potential for carbon capture and storage. Academic research has produced a set of mathematical models of underground coal gasification, and the European Union-supported programme has addressed the production of a decarbonised product gas for carbon capture and storage. In recent years, significant progress has been made into the modelling of tar formation, spalling, flows within the cavity and the control of minor gasification components, like BTEX and phenols, from underground coal gasification cavities (BTEX refers to the chemicals benzene, toluene, ethylbenzene and xylene). The paper reviews the most recent underground coal gasification field trial and modelling experience and refers to the pubic concern and caution by regulators that arise when a commercial or pilot-scale project seeks approval. It will propose solutions for the next generation of underground coal gasification projects. These include the need to access deeper coal seams and the use of new techniques for modelling the process.
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Tian, Hui Ying, Yang Li, Ying Dou Zhang, Quan Sheng Liu, Ke Duan Zhi, Run Xia He, and Xiao Rong Zhang. "Fundamental Study on Steam Gasification Reactivity of Typical Different Metamorphic Grade Coals." Advanced Materials Research 953-954 (June 2014): 1201–4. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.1201.
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The steam gasification experiment of FJC lignite, BL lignite, SH bituminous and TT anthracite were carried out by using an own design WFSM-3060TL Catalyst Evaluation Unit apparatus. The infulence of coal rank on the steam gasification activity was investigated. Experiment conditions: heating rate:15°C/min (25°C-500°C), 2°C/min (500°C-850°C). The resuts show that gasification of lignite is better. With the deepening of coal rank, the steam gasifiction reactivity of coal samples decreases obviously, the higher the coal rank is, the worse the gasification reactivity is.
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Rizkiana, Jenny, Ryzka Pranata, Hasna Nisrina Fauzi, Winny Wulandari, and Dwiwahju Sasongko. "Low Rank Coal Pre-treatment to Increase Its Reactivity Towards Gasification with Biomass." MATEC Web of Conferences 156 (2018): 03020. http://dx.doi.org/10.1051/matecconf/201815603020.
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Coal can be used to produce hydrogen through steam gasification process. Indonesia has abundant coal reserves and thus hydrogen production from coal is very attractive. However, steam gasification of coal usually requires high temperature due to its low volatile content. The use of catalyst, such as alkaline and alkaline earth metal (AAEM) may promote the hydrogen production. AAEM metal can be found in biomass and thus co-gasification of coal and biomass may become the attractive solution as the AAEM may volatilize during gasification and catalyze the coal when it attaches to the coal surface. However, the presence of silicate may decrease catalytic activity of the attached AAEM and thus it needs to be removed by deashing process. This research aims to determine the effect of the solution type, solution concentration, reaction temperature, and reaction time of coal deashing. The results showed that deashing process decreased the ash content of coal to some extent proved by the gravimetric analysis result. The decrease of ash content also affected to the surface morphology of the coal as some pores are formed and thus the surface area of coal increased slightly. The increase of surface area allows more AAEM to be attached to the coal surface so that the coal may become more reactive towards steam gasification.
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Li, Yan, Guoshun Wang, Zhaohao Li, Jiahai Yuan, Dan Gao, and Heng Zhang. "A Life Cycle Analysis of Deploying Coking Technology to Utilize Low-Rank Coal in China." Sustainability 12, no. 12 (June 15, 2020): 4884. http://dx.doi.org/10.3390/su12124884.
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At present, the excess capacity in China’s coke industry can be deployed to utilize some low-rank coal, replacing coking coal with potential economic gains, energy efficiency, and environmental benefits. This study presents a life cycle analysis to model these potential benefits by comparing a metallurgical coke technical pathway with technical pathways of gasification coke integrated with different chemical productions. The results show that producing gasification coke is a feasible technical pathway for the transformation and development of the coke industry. However, its economic feasibility depends on the price of cokes and coals. The gasification coke production has higher energy consumption and CO2 emissions because of its lower coke yield. Generally speaking, using gasification coke to produce F-T oils has higher economic benefits than producing methanol, but has lower energy efficiency and higher carbon emissions.
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Zhang, Zhi-Yuan, Heng-Tao Zhou, Qian Zhou, Pei-Jun Rao, and Huan-Guang Zhu. "Catalytic Effect of Inherently-Water-Soluble Sodium on Zhundong Coal Gasification." Science of Advanced Materials 12, no. 7 (July 1, 2020): 1019–26. http://dx.doi.org/10.1166/sam.2020.3751.
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Coal loaded with inherently-water-soluble sodium was prepared with dicyclohexyl-18-crown-6 to investigate the effects of inherently-water-soluble sodium on temperature-programmed isothermal gasification. The results were compared with Na2CO3-loaded coal using thermo-gravimetric analysis (TGA), and the results showed that sodium had a catalytic effect on gasification, and water-soluble sodium had a stronger catalytic ability than Na2CO3. The isothermal gasification reaction of inherently-water-soluble-sodium-loaded coal was complete in 4.68 min, whereas that of Na2CO3-loaded coal was complete in 5.39 min. Chemisorption of CO2 to chars was investigated by TGA at 300 C, which showed that the order of CO2 chemisorption capacity was similar to that of the catalytic abilities during gasification. Therefore, the CO2 chemisorption capacity accurately reflects differences in the gasification reactivity. Moreover, the distribution of sodium in coal and char structures were investigated by multiple techniques, including scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and X-ray diffraction (XRD). EDS-mapping images of Na-loaded coal indicated that inherently-water-soluble sodium mainly adhered to coal particles. This finding shows that coal graphitization was strongly inhibited by inherently-water-soluble sodium, which further strengthened the chemisorption of CO2 to char and the reactivity of char during gasification.
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Yopianita, Aria, Aida Syarif, uhammad Yerizam, and Rusdianasari Rusdianasari. "Biocoal Characterization as an Environmentally Friendly Alternative Energy Innovation Composite Variations of Gasified Char with Coconut Shell Charcoal." Indonesian Journal of Fundamental and Applied Chemistry 7, no. 2 (June 25, 2022): 68–79. http://dx.doi.org/10.24845/ijfac.v7.i2.68.
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In accordance with the mandate of the Regulation of the Indonesian Minister of Energy and Mineral Resources for the use of cleaner coal through coal gasification projects, in the future the coal gasification industry will produce char as a by-product. This study aims to characterize coal gasification char using a prototype underground coal gasification (UCG) and the addition of coconut shell charcoal biomass as a raw material for making biobriquettes. By using coal as raw material from the Muara Tiga Besar Mine of PT Bukit Asam, five kinds of coal samples from different layers were obtained, which from the characterization results, both coal and char, did not have too significant deviations so that the research variables could be ignored. The results of the characterization of char from coal gasification results compared to the initial sample of coal showed an increase in calorific value, a decrease in sulfur content and a significant decrease in water content, so it can be concluded that char from coal gasification has good potential as a raw material for biobriquettes. By using char and coconut shell charcoal with the ratio of variations in the composition of char and coconut shell compositions is 100%:0%; 75%:25%; 50%:50%; 25%:75% and 0%:100% carried out the briquetting process. The results of the biobriquette characterization met the criteria of the Indonesian National Standard (SNI) 01-6235-2000 and Minister of Energy and Mineral Resources regulation No. 047 of 2006
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Ardila-Barragán, Marco Antonio, Carlos Francisco Valdés-Rentería, Brennan Pecha, Alfonso López-Díaz, Eduardo Gil-Lancheros, Marley Cecilia Vanegas-Chamorro, Jesús Emilio Camporredondo-Saucedo, and Luis Fernando Lozano-Gómez. "Gasification of coal, Chenopodium Album biomass, and co-gasification of a coal-biomass mixture by thermogravimetric-gas analysis." Revista Facultad de Ingeniería 28, no. 53 (October 2, 2019): 53–77. http://dx.doi.org/10.19053/01211129.v28.n53.2019.10147.
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Gasification studies were performed on sub-bituminous coal of the province Centro in Boyacá state of Colombia, vegetable biomass Chenopodium album (cenizo) and co-gasification of coal-biomass mixtures agglomerated with paraffin in a thermogravimetric analyzer. Biomass synergistically promoted thermochemical transformation of the coal was observed. Experimental results were compared to equilibrium composition simulations. Ash fusibility tests of the coal-biomass mixture were carried out, which allowed to clarify its behavior, such as dry or fluid ash according to own chemical composition, during the gasification process. The experimental tests allowed determining the differences in thermal decomposition, between coal, cenizo and coal-biomass blend, which are attributable to the physicochemical properties of each one solid fuel. During the tests, gas chromatography analyses were performed to establish the compositions of the syngas. The syngas obtained from biomass had the highest concentration of CO and the lowest H2; the coal and the coal-biomass mixture were slightly minor respectively. Concentrations of CH4, CO2 and C2H4 were similar between coal and biomass. This result is consistent with the higher calorific value of the coal syngas. The production of syngas from the coal-biomass mixture had the lowest contents of H2 and CO due to synergistic phenomena that occur with the fuel mixture. The co-gasification of the mixture gave the highest syngas production, carbon conversion, and thermal efficiency. These results indicate the viability of co-gasification of coal-Chenopodium album agglomerated mixtures. In gasification of non-agglomerated mixtures of coal-cenizo, the biomass can be burned directly without producing syngas.
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Zdravkov, Alexander, Doris Groβ, Dragana Životić, Ivan Kojić, Ksenija Stojanović, and Achim Bechtel. "Preliminary petrographic assessment of the suitability of Bobov Dol coals, SW Bulgaria for fluidized-bed coal gasification." Review of the Bulgarian Geological Society 85, no. 1 (July 2024): 79–84. http://dx.doi.org/10.52215/rev.bgs.2024.85.1.79.
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Coal samples from seams Ia, I, IIa+b, III, IV, and V from the Bobov Dol deposit in SW Bulgaria were studied using optical microscopy and proximate analysis in order to determine their suitability for fluidized-bed gasification. The moderate- to high seam averaged ash yields and the huminite reflectance values in the range 0.43–0.5 classify the studied coals as medium- to very low grade, low-rank A (sub-bituminous) according to the International classification of in-seam coals. Based on the organic composition and ash yields, the coals from seams IIa+b, III, IV, and V seem more suitable for fluidized-bed gasification, but their usefulness will depend largely on the coal pre-processing.
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Li, Guang Yu, Shi Sen Xu, Jun Cang Xia, and Yong Qiang Ren. "Study on Gasification Characteristics of Petroleum Asphalt in a Two-Stage Gasifier." Advanced Materials Research 953-954 (June 2014): 1673–77. http://dx.doi.org/10.4028/www.scientific.net/amr.953-954.1673.
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The gasification performance of petroleum asphalt in a two-stage gasifier was investigated through experiments and simulations. The analysis results of asphalt samples show that the asphalt has characteristics of high volatile content, high calorific value, and low ash content. Coal pyrolysis model, gas-solid heterogeneous reaction model, gas homogeneous reaction model and Gibbs free energy minimization method were employed to build the two-stage entrained flow gasification model and simulate the asphalt gasification process using Aspen Plus software. The results indicate that the cold gas efficiency of asphalt is 3% higher than that of bituminous coal, while the consumption of coal and oxygen is 40% lower than that of bituminous coal. The gasification performance of asphalt is superior to that of coal. In addition, the cold gas efficiency of asphalt can be increased by about 3% when the two-stage gasification process is employed. The utilization rate of coal in the two-stage gasifier is much higher than that in traditional one-stage gasifier.
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Bielowicz, Barbara. "Selected Critical Raw Materials in Waste from Coal Gasification in Poland." Energies 14, no. 23 (December 2, 2021): 8071. http://dx.doi.org/10.3390/en14238071.
Full textAbstract:
In an effort to identify new sources of critical raw materials (CRMs) possibility of recovering selected CRMs from Polish coals, chars, and ashes resulting from the combustion of coals and chars was investigated. The samples were collected from pilot fluidized bed gasification systems. The search for CRMs in coal gasification wastes has not been widely reported before. The study used 2 bituminous coal and 1 lignite sample; the concentration of individual critical raw materials (CRMs) was analyzed using the ICP-MS method. The obtained results were compared with Clarke values in coal ash and in the Earth’s crust, and with the adopted cut-off grade. As shown by the analysis, the highest concentrations of CRMs can be found in fly ash, mainly in samples from the eastern part of the Upper Silesian Coal Basin. This applies mostly to Be, Cs, or Sb due to the fact that their concentrations were found to be higher than the Clarke value in the Earth’s crust; the mentioned fly ashes could be used as potential sources of critical elements if appropriate recovery technologies are developed. In addition, the tested materials have elevated Se, Pb, Ni concentrations, but their recovery is currently not economically viable. Compared to the currently adopted cut-off grade levels, there are no critical elements in the analyzed coal gasification waste that could be recovered.
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Konovsek, Damjan, Zdravko Praunseis, Jurij Avsec, Gorazd Bercic, Andrej Pohar, Simon Zavsek, and Milan Medved. "Underground coal gasification - the Velenje Coal Mine energy and economic calculations." Chemical Industry and Chemical Engineering Quarterly 23, no. 2 (2017): 269–77. http://dx.doi.org/10.2298/ciceq160504042k.
Full textAbstract:
Underground coal gasification (UCG) is a viable possibility for the exploitation of vast coal deposits that are unreachable by conventional mining and can meet the energy, economic and environmental demands of the 21st century. Due to the complexity of the process, and the site-specific coal and seam properties, it is important to acknowledge all the available data and past experiences, in order to conduct a successful UCG operation. Slovenia has huge unmined reserves of coal, and therefore offers the possibility of an alternative use of this domestic primary energy source. According to the available underground coal gasification technology, the energy and economic assessment for the exploitation of coal to generate electricity and heat was made. A new procedure for the estimation of the energy efficiency of the coal gasification process, which is also used to compare the energy analyses for different examples of coal exploitation, was proposed, as well as the technological schemes and plant operating mode in Velenje, and the use of produced synthetic coal gas (syngas). The proposed location for the pilot demonstration experiment in Velenje Coal Mine was reviewed and the viability of the underground coal gasification project in Velenje was determined.
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Saik, P., V. Lozynskyi, D. Malachkevych, and O. Cherniaіeva. "To the issue of underground gasification of low-thickness unconditioned coal reserves." Collection of Research Papers of the National Mining University 71 (December 2022): 91–103. http://dx.doi.org/10.33271/crpnmu/71.091.
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Purpose. Formation of an innovative approach in the rational development of low-thickness unconditioned coal reserves with the establishment of their suitability for underground gasification technology and the study of mass and heat indicators of the gasification process on the example of the mine of PJSC "DTEK Pavlohradvuhillia" named after Heroiv Kosmosu. Methods. The possibility of implementing the technology of in situ underground coal gasification was based on analytical studies. On the basis of the work developed by the professor of the Department of Mining Engineering and Education of "Dnipro University of Technology" Dychkovskyi R.O "Methods for assessing the suitability of reserves for underground coal gasification" established the general coefficient of the suitability of coal reserves for gasification located within the minefield named after Heroiv Kosmosu and are promising for future development. The output parameters of combustible and ballast generator gases, and the chemical and energy efficiency of the gasification process were studied using the "MTB SPGV" software, which passed industrial approval both during laboratory and field tests. Findings. Current issues related to the application of a combination the technologies for the development of low-thickness non-conditional coal reserves, which allow significantly extend the life of the mining enterprise, are highlighted. In particular, after working out the productive areas of coal reserves, the orientation of production is aimed at the processing of reserves at the place of their occurrence by underground gasification technology. Criteria for the suitability of coal reserves were established, which allowed the establishment of the priority of coal seams gasification. Based on the change in the parameters of the fuel mixture, the output of combustible and ballast generator gases was investigated. Originality. It was established that when air and oxygen-enriched blowing is supplied to the underground gas generator, the output volume of combustible generator gases remains the same, the difference lies in the concentration of these gases in the initial mixture. This is due to the high content of nitrogen during air blowing, which does not enter into a chemical reaction with coal, and at temperatures in the reaction channel below 900°C, the output of CO decreases by 25-46%. Practical implications. The conditions of the mine named after Heroiv Kosmosu defined criteria for the suitability of coal for gasification. Two coal seams of the mine c12 and c7top are in conditions of sufficient suitability for underground coal gasification.
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He, Chengqian, and Di Wu. "Study on the proportion of coal gasification slag paste filling material." E3S Web of Conferences 352 (2022): 01003. http://dx.doi.org/10.1051/e3sconf/202235201003.
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Aiming at the utilization of coal gasification slag, it is proposed to prepare coal gasification slag as mine filling material. The optimum ratio of cement: coal gasification slag: gangue is 1:5:1, the mass fraction is 70%, and the dosage of quicklime is 4%. The strength of backfill reaches 4.23mpa, which can meet the requirements of mine backfill strength.