Bibliografie tematiche / Entrained flow coal gasification

Letteratura scientifica selezionata sul tema "Entrained flow coal gasification"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 31 gennaio 2023

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Articoli di riviste sul tema "Entrained flow coal gasification"

1

Kim, Hakduck, Kitae Jeon, Heechang Lim e Juhun Song. "Parameter analysis of an entrained flow gasification process". Advances in Mechanical Engineering 10, n. 12 (dicembre 2018): 168781401881525. http://dx.doi.org/10.1177/1687814018815255.

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This work presents primary results of a parameter study for entrained flow gasification using a steady-flow reactor model. The influences of important parameters such as coal types, gasifier pressure, gas/coal feeding rate, and coal particle size were studied based on coal conversion and gas product species. The prediction results were compared and validated against those published previously. In particular, a relative importance of reaction stoichiometry, temperature, reaction time (kinetics), or residence time considered in this simulation work was evaluated to affect the gas composition produced from different coals. The optimal carbon monoxide concentration was observed at an oxygen-to-fuel ratio of 0.8, while a greatest carbon conversion was found at a steam-to-fuel ratio of 0.4. Coal particle size has a strong influence on carbon conversion. However, the coal feeding rate has no effect on carbon conversion despite differences in residence time.
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Chui, E. H., A. J. Majeski, D. Y. Lu, R. Hughes, H. Gao, D. J. McCalden e E. J. Anthony. "Simulation of entrained flow coal gasification". Energy Procedia 1, n. 1 (febbraio 2009): 503–9. http://dx.doi.org/10.1016/j.egypro.2009.01.067.

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3

Rajper, Suheb Ali, Imran Nazir Unar, Azizullah Channa e Zulfiqar Ali Bhatti. "Investigation of Performance for Entrained Flow Gasifier Through Simulations". January 2020 39, n. 1 (1 gennaio 2020): 97–110. http://dx.doi.org/10.22581/muet1982.2001.10.

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Pakistan has proven huge coal reserves but still unable to harvest the energy due to unavailability of ingenious technology. Coal gasification is robust, efficient and environmental friendly technology but it is highly sensitive to the coal characteristics. Scant literature is available on the development of the coal gasification technology which suits the characteristics of indigenous coal reserves. This papers presents the simulation of entrained flow gasifier for using indigenous coal through process modeling software namely Aspen Plus® to evaluate various system flow steps within an entrained flow gasifier. General techniques have also been discussed for creating the equilibrium-bases simulations of gasification systems. Peng-Robinson equation was used to correlate the volume of species with respect to state variables (temperature and pressure). The effects of composition of different indigenous coals like Thar, Lakhra and Sonda were investigated through simulations along with O/C (Oxygen-to-Carbon) ratio. Parametric study revealed that the O/C ratio along with other related system parameters have great influence on the performance. Sulfur could be available in different forms in coal like pyrite, sulfate or organic sulfur so appropriate form of sulfur in feedstocks should be corrected for better accuracy of model results. The highest percentages of CO i.e. 44.2, 37.8, and 46.6% were obtained from Thar coal (air dried form), Lakhra coal and Sonda coal respectively at the 0.3 O/C ratio. The decrease in LHV and HHV (Lower and Higher Heating Values) of syngas was observed on increase of O/C ratio for all coal types. The composition of as received Thar coal gave maximum LHV (1.5x104 KJ/Kg) and HHV (1.78x104 KJ/Kg) at the 0.3 O/C ratio. The future work could be extended by simulating biomass composition in the developed model of gasifier in transient simulations.
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Zhang, Guan, Hou, Zhang, Li, Meng e Wang. "Markov Chain Simulation of Coal Ash Melting Point and Stochastic Optimization of Operation Temperature for Entrained Flow Coal Gasification". Energies 12, n. 22 (7 novembre 2019): 4245. http://dx.doi.org/10.3390/en12224245.

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In the entrained flow coal gasification process, the gas production is critically affected by the operating temperature (OT) and coal ash melting point (AMP), and the AMP is one of key factors for the determinations of OT. Considering the fact that coal is a typical nonhomogeneous substance and the coal ash composition varies from batch to batch, this paper proposes the application of the Markov Chain (MC) method in simulation of the random AMP series and the stochastic optimization of OT based on MC simulation for entrained flow coal gasification. The purpose of this paper is to provide a more accurate optimal OT decision method for entrained flow coal gasification practice. In this paper, the AMP was regarded as a random variable, and the random process method, Markov Chain, was used to describe the random AMP series of feed coal. Firstly, the MC simulation model about AMP was founded according to an actual sample data, 200 sets of AMP data from an industrial gasification plant under three simulation schemes (the sample data were individually divided into 16, eight and four state groups,). The comparisons between the simulation results and the actual values show that the founded MC simulation model descries the AMP series very well. Then, a stochastic programming model based on MC simulation for OT optimization was developed. Finally, this stochastic programming optimization model was optimized by genetic algorithm (GA). Comparing with the conventional OT optimization method, the proposed stochastic OT optimization model integrated MC simulation can ascertain a more accurate OT for guiding the coal gasification practice.
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Liu, Xiao Di, Tian Yi Hao, Yong Zhang e Xue Ying Gu. "Update Progress of Pressurized Entrained-Flow Gasifier with Coal Slurry in China". Applied Mechanics and Materials 672-674 (ottobre 2014): 716–22. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.716.

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Coal Water Slurry (CWS) gasification technology has a stable market due to its technical advantages. China did a lot of research and development work in coal slurry gasification technology, which has made considerable progress. Especially CWS gasification technology with Membrane Water Wall which was put into operation in recent years got a significant improvement in terms of safety, fuel flexibility, reliability and continuous operation cycles.
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Feng, Ping, Weigang Lin, Peter Arendt Jensen, Wenli Song, Lifang Hao, Klaus Raffelt e Kim Dam-Johansen. "Entrained flow gasification of coal/bio-oil slurries". Energy 111 (settembre 2016): 793–802. http://dx.doi.org/10.1016/j.energy.2016.05.115.

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Liu, Xiang Jun, Wu Rong Zhang e Tae Jun Park. "Modelling coal gasification in an entrained flow gasifier". Combustion Theory and Modelling 5, n. 4 (dicembre 2001): 595–608. http://dx.doi.org/10.1088/1364-7830/5/4/305.

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WATANABE, H., e M. OTAKA. "Numerical simulation of coal gasification in entrained flow coal gasifier". Fuel 85, n. 12-13 (settembre 2006): 1935–43. http://dx.doi.org/10.1016/j.fuel.2006.02.002.

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Pomykała, Radosław. "Properties of Waste from Coal Gasification in Entrained Flow Reactors in the Aspect of Their Use in Mining Technology / Właściwości odpadów ze zgazowania węgla w reaktorach dyspersyjnych w aspekcie ich wykorzystania w technologiach górniczych". Archives of Mining Sciences 58, n. 2 (1 giugno 2013): 375–93. http://dx.doi.org/10.2478/amsc-2013-0026.

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Most of the coal gasification plants based of one of the three main types of reactors: fixed bed, fluidized bed or entrained flow. In recent years, the last ones, which works as „slagging“ reactors (due to the form of generated waste), are very popular among commercial installations. The article discusses the characteristics of the waste from coal gasification in entrained flow reactors, obtained from three foreign installations. The studies was conducted in terms of the possibilities of use these wastes in mining technologies, characteristic for Polish underground coal mines. The results were compared with the requirements of Polish Standards for the materials used in hydraulic backfill as well as suspension technology: solidification backfill and mixtures for gob caulking.
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ITAYA, Yoshinori, Nobusuke KOBAYASHI, Shigenobu HATANO e Akina FUJIMORI. "B209 GASIFICATION OF COMBINED BIOMASS AND COAL IN DOWN-FLOW ENTRAINED BED(Combustion-6)". Proceedings of the International Conference on Power Engineering (ICOPE) 2009.2 (2009): _2–129_—_2–134_. http://dx.doi.org/10.1299/jsmeicope.2009.2._2-129_.

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Tesi sul tema "Entrained flow coal gasification"

1

Alonso, Lozano Alvaro. "Coal gasification in entrained flow gasifiers simulation & comparison". Thesis, Högskolan i Gävle, Avdelningen för bygg- energi- och miljöteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-12726.

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RAKHSHI, AALIA. "A COMPUTATIONAL STUDY OF DEVOLATILIZATION AND KINETICS IN ENTRAINED FLOW COAL GASIFICATION". OpenSIUC, 2018. https://opensiuc.lib.siu.edu/dissertations/1534.

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Computational fluid dynamics (CFD) modeling is an integral part of the design cycle of modern entrained flow gasifiers. Gasification modeling considers an interacting multi-phase media in a turbulent environment. Several gasification sub-models have been developed and validated over the last thirty five years related to turbulence, gaseous combustion, devolatilization and char reactions. The CFD model of gasification must be valid for a range of operating conditions, reactor designs and feedstock compositions. Although tremendous strides have been made in every aspect of gasification modeling, shortcomings do exist in many of the sub-models. Two problems of practical significance are studied in this dissertation. The first is related to devolatilization and the second deals with the accuracy of the gaseous and char combustion models. A focus and consideration of the two problems will improve the predictive capability of the gasification model. In the first, a new framework for volatile breakdown is developed for entrained flow gasification modeling. The framework is based on an optimized solution of an under-determined system of equations formulated using a two-step Moore-Penrose generalized matrix approach. The approach permits the determination of the volatile composition using just the Proximate-Ultimate analysis data of coal. The method can be utilized for all coal types irrespective of origin.The accuracy and consistency of the framework is demonstrated by direct comparison with available devolatilization breakdown data. The overall performance of the framework is also appraised by incorporating it in a CFD simulation of an actual entrained flow gasifier, the 2550 TPD ConocoPhillips EGas technology based two stage oxygen blown gasifier. The reactor exit syngas composition from the simulation is favorably compared with available experimental data. In the second problem, a kinetics assessment of the quasi-global homogeneous and heterogeneous reaction mechanisms is carried out for entrained flow coal gasification modeling. Accurate closure of the chemical source term in gasification modeling necessitates a detailed study of turbulence-chemistry interaction. Towards this end, time-scale analysis of the homogeneous reactions is discussed using eigenvalue analysis of the reaction rate Jacobian matrix. A singular value decomposition of the stoichiometric reaction matrix is performed to assess the behavior of the homogeneous reactions in a reduced species vector space. The significant factors affecting the heterogeneous char reactions is assessed and the relative importance of bulk diffusion and inherent char kinetics is analyzed in a gasifier. The overall study is carried out using numerical and experimental results of an actual pilot scale gasifier, the 200 TPD (tons per day) Mitsubishi Heavy Industries (MHI) pilot scale air blown gasifier.
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Silaen, Armin. "Comprehensive Modeling and Numerical Investigation of Entrained-Flow Coal Gasifiers". ScholarWorks@UNO, 2010. http://scholarworks.uno.edu/td/1148.

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Numerical simulations of coal gasification process inside a generic 2-stage entrainedflow gasifier are carried out using the commercial CFD solver ANSYS/FLUENT. The 3-D Navier-Stokes equations and eight species transport equations are solved with three heterogeneous global reactions, three homogeneous reactions, and one thermal cracking equation of volatiles. Finite rates are used for the heterogeneous solid-gas reactions. Both finite rate and eddy-breakup combustion models are calculated for each homogeneous gas-gas reaction, and the smaller of the two rates is used. Lagrangian-Eulerian method is employed. The Eulerian method calculates the continuous phase while the Lagrangian method tracks each coal particle. Fundamental study is carried out to investigate effects of five turbulence models (standard k-ε, k-ω, RSM, k-ω SST, and k-ε RNG) and four devolatilization models (Kobayashi, single rate, constant rate, and CPD) on gasification simulation. A study is also conducted to investigate the effects of different operation parameters on gasification process including coal mixture (dry vs. slurry), oxidant (oxygen-blown vs. air-blown), and different coal distributions between two stages. Finite-rate model and instantaneous gasification model are compared. It is revealed that the instantaneous gasification approach can provide an overall evaluation of relative changes of gasifier performance in terms of temperature, heating value, and gasification efficiency corresponding to parametric variations, but not adequately capture the local gasification process predicted by the finite rate model in most part of the gasifier. Simulations are performed to help with design modifications of a small industrial demonstration entrained-flow gasifier. It is discovered that the benefit of opening the slag tap on the quench-type gasifier wider by allowing slag to move successfully without clogging is compromised by increased heat losses, reduced gasification performance, downgraded syngas heating value, and increased unburned volatiles. The investigation of heat transfer on fuel injectors shows that blunt tip fuel injector is less likely to fail compared to conical tip fuel injector because the maximum high temperature on the injector is scattered. Two concentric fuel/oxidant injections provide better fuel-oxidant mixing and higher syngas heating value than four separate fuel and oxidant injections.
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Lu, Xijia. "An Applied Numerical Simulation of Entrained-Flow Coal Gasification with Improved Sub-models". ScholarWorks@UNO, 2013. http://scholarworks.uno.edu/td/1696.

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Abstract (sommario):
The United States holds the world's largest estimated reserves of coal and is also a net exporter of it. Coal gasification provides a cleaner way to utilize coal than directly burning it. Gasification is an incomplete oxidation process that converts various carbon-based feedstocks into clean synthetic gas (syngas), which can be used to produce electricity and mechanical power with significantly reduced emissions. Syngas can also be used as feedstock for making chemicals and various materials. A Computational Fluid Dynamics (CFD) scheme has been used to simulate the gasification process for many years. However, many sub-models still need to be developed and improved. The objective of this study is to use the improved CFD modeling to understand the thermal-flow behavior and the gasification process and to provide guidance in the design of more efficient and cheaper gasifiers. Fundamental research has been conducted to improve the gasification sub-models associated with the volatile thermal cracking, water-gas-shift (WGS) reaction, radiation effect, low-rank-coal gasification, coal to synthetic-natural-gas (SNG), and ash deposition mechanisms. The improved volatile thermal cracking model includes H2S and COS contents. A new empirical WGS reaction model is developed by matching the result with experimental data. A new coal demoisturization model is developed for evaporating the inherent moisture inside the coal particles during low-rank-coal gasification. An ash deposition model has also been developed. Moreover, the effect of different radiation models on the simulated result has been investigated, and the appropriate models are recommended. Some improved model tests are performed to help modify an industrial entrained-flow gasifier. A two-stage oxygen feeding scheme and a unique water quench design are investigated. For the two-stage oxygen feeding design, both experimental data and CFD predictions verify that it is feasible to reduce the peak temperature and achieve a more uniform temperature distribution in the gasifier by controlling the injection scheme without changing the composition and production rate of the syngas. Furthermore, the CFD simulation can acceptably approximate the thermal-flow and reaction behaviors in the coal gasification process, which can then be used as a preliminary screening tool for improving existing gasifiers’ performance and designing new gasifiers.
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Young, Christopher Michael. "Pressure Effects on Black Liquor Gasification". Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11539.

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Gasification of black liquor is an alternative to the combustion of black liquor, which is currently the dominant form of chemical recovery in the paper industry. Gasification of black liquor offers the possibility of higher thermal efficiencies than combustion, reducing manufacturing costs and creating new revenue streams through a forest biorefinery. Pressurizing the gasification reactor further enhances the efficiency advantage of gasification over combustion. This study uses a pressurized entrained flow reactor (PEFR) to study black liquor gasification behavior under pressures, temperatures, and heating rates similar to those of next-generation high-temperature black liquor gasifiers. The effects of pressure on black liquor char morphology, gasification rates, pyrolysis carbon yields, and sulfur phase distribution were studied. These characteristics were investigated in three main groups of experiments at 900oC: pyrolysis (100% N2), gasification with constant partial pressure (0.25 bar H2O and 0.50 bar CO2), and gasification with constant mole fraction (10% CO2, 2% H2O, 1.7% CO, 0.3% H2), under five, ten, and fifteen bar total pressure. It was found that pressure had an impact on the char physical characteristics immediately after the char entered the reactor. Increasing pressure had the effect of decreasing the porosity of the chars. Pressure also affected particle destruction and reagglomeration mechanisms. Surface areas of gasification chars decreased with increasing pressures, but only at low carbon conversions. The rate of carbon conversion in gasification was shown to be a function of the gas composition near the particle, with higher levels of inhibiting gases slowing carbon conversion. The same phenomenon of product gas inhibition observed in gasification was used to explain carbon conversions in pyrolysis reactions. Sulfur distribution between condensed and gas phases was unaffected by increasing total pressure in the residence times investigated. Significant amounts of sulfur are lost during initial devolatilization. With water present this gas phase sulfur forms H2S and did not return to the condensed phase.
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Duchesne, Marc A. "Slagging in Entrained-flow Gasifiers". Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23353.

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Gasification is a flexible technology which is applied in industry for electricity generation, hydrogen production, steam raising and liquid fuels production. Furthermore, it can utilize one or more feedstocks such as coal, biomass, municipal waste and petroleum coke. This versatility, in addition to being adaptable to various emissions control technologies (including carbon capture) renders it an attractive option for years to come. One of the most common gasifier types is the entrained-flow slagging gasifier. The behaviour of inorganic fuel components in these gasifiers is still ill-understood even though it can be the determining factor in their design and operation. A literature review of inorganic matter transformation sub-models for entrained-flow slagging gasifiers is provided. Slag viscosity was identified as a critical property in the sub-models. Slag viscosity models are only applicable to a limited range of slag compositions and conditions, and their performance is not easily assessed. An artificial neural network model was developed to predict slag viscosity over a broad range of temperatures and slag compositions. Furthermore, a toolbox was developed to assist slag viscosity model users in the selection of the best model for given slag compositions and conditions, and to help users determine how well the best model will perform. The slag viscosities of coal, petroleum coke and coal/petroleum coke blends were measured in the temperature range of 1175-1650ºC. Interaction of vanadium-rich slags with various materials was investigated. The results from the first two parts of a three-part research program which involves fuel characterization, testing in a 1 MWth gasifier, and computational fluid dynamics (CFD) modeling for entrained-flow slagging gasification are presented. The end goal is to develop a CFD model which includes inorganic matter transformations. Fuel properties were determined with prioritization based on their application; screening of potential fuels, ensuring proper gasifier operation, gasifier design and/or CFD modeling. Using CanmetENERGY’s 1 MWth gasifier, five gasification tests were completed with the characterized coals. Solid samples from the refractory liners, in-situ gas sampling probe sheaths and impingers, the slag tap, the slag pot, quench discharge water and scrubber water were collected and characterized.
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Kumar, Mayank Ph D. Massachusetts Institute of Technology. "Multiscale CFD simulations of entrained flow gasification". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/69495.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.
Cataloged from PDF version of thesis.
Includes bibliographical references.
The design of entrained flow gasifiers and their operation has largely been an experience based enterprise. Most, if not all, industrial scale gasifiers were designed before it was practical to apply CFD models. Moreover, gasification CFD models developed over the years may have lacked accuracy or have not been tested over a wide range of operating conditions, gasifier geometries and feedstock compositions. One reason behind this shortcoming is the failure to incorporate detailed physics and chemistry of the coupled non-linear phenomena occurring during solid fuel gasification. In order to accurately predict some of the overall metrics of gasifier performance, like fuel conversion and syngas composition, we need to first gain confidence in the sub-models of the various physical and chemical processes in the gasifier. Moreover, in a multiphysics problem like gasification modeling, one needs to balance the effort expended in any one submodel with its effect on the accuracy of predicting some key output parameters. Focusing on these considerations, a multiscale CFD gasification model is constructed in this work with special emphasis on the development and validation of key submodels including turbulence, particle turbulent dispersion and char consumption models. The integrated model is validated with experimental data from various pilot-scale and laboratory-scale gasifier designs, further building confidence in the predictive capability of the model. Finally, the validated model is applied to ascertain the impact of changing the values of key operating parameters on the performance of the MHI and GE gasifiers. The model is demonstrated to provide useful quantitative estimates of the expected gain or loss in overall carbon conversion when critical operating parameters such as feedstock grinding size, gasifier mass throughput and pressure are varied.
by Mayank Kumar.
Ph.D.
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Rasid, Ruwaida Abdul. "Modelling and simulation of entrained flow gasification processes". Thesis, University of Leeds, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.595675.

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Depletion of conventional fossil fuel resources, as well as concerns regarding their environmental impact is a driving factor in the search for cleaner alternative fuels. Through the gasification of solid fuels, the produced syngas can be reacted to produce a cleaner, alternative liquid fuel. This thesis presents the development and use of a combination of fundamental and process models to evaluate alternative fuel production through a pressurised entrained flow gasification process. These include an equilibrium model, a one dimensional model and a process model. An equilibrium model using the non-stoichiometric approach based on the minimisation of Gibbs free energy and the Lagrange multipliers was established. A series of evaluations were performed to study the impact of the process conditions related to the entrained flow gasification, at the same time validating the model through comparisons with commercial software. It was shown that the model was not only quick to be developed, the results were also in excellent agreement with the commercial software it was compared to. A detailed one dimensional model of an entrained flow gasifier was developed from first principles. It is more complex than the equilibrium model, as it allows for evaluation of the variables along the length of the gasifier. Review of the available one-dimensional models of entrained flow gasifiers in the literature revealed inconsistent implementation of heat transfer mechanisms. The study showed that the solid-wall radiation along with the heterogeneous heat of reactions were the dominant heat transfer mechanisms in the entrained flow gasifier. In addition, although this model was developed specifically for a coal gasification process, assessment of biomass addition was also studied. ]t was shown that the best biomass mixtures were between 25% - 50%. A process model was developed in AspenHYSYS, which has enabled the entrained flow gasifier to be integrated with related auxiliary process equipment to model desired operating conditions. Implementation of the coal and biomass gasification for a polygeneration process is promising. Technoeconomic studies reveal that although biomass introduction may increase the costs of fuel, they are more environmentally-friendly as negative carbon emission can be achieved.
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Gibbs, Laura Anne. "Coal devolatilization in an entrained flow reactor". Thesis, University of Ottawa (Canada), 1989. http://hdl.handle.net/10393/6029.

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Joyce, James Alexander. "Pressurised entrained flow gasification of sugar cane wastes for cogeneration /". [St. Lucia, Qld.], 2006. http://adt.library.uq.edu.au/public/adt-QU20060713.095935/index.html.

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Libri sul tema "Entrained flow coal gasification"

1

Smoot, L. Pulverized-Coal Combustion and Gasification: Theory And Applications For Continuous Flow Processes. Springer, 2013.

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Smoot, L. Pulverized-Coal Combustion and Gasification: Theory and Applications for Continuous Flow Processes. Springer, 2013.

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Capitoli di libri sul tema "Entrained flow coal gasification"

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Kumar, Mayank. "Entrained Flow Gasification: Current Status and Numerical Simulations". In Coal and Biomass Gasification, 281–306. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7335-9_11.

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Erickson, T. A., D. W. Brekke, J. E. Tibbetts e B. C. Folkedahl. "Techniques for Determining Inorganic Transformations During Entrained-Flow Coal Gasification". In The Impact of Ash Deposition on Coal Fired Plants, 101–12. Boca Raton: Routledge, 2022. http://dx.doi.org/10.1201/9780203736616-11.

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ten Brink, H. M., G. Hamburg e S. Eenkhoorn. "Slagging in Entrained-Flow Gasification and Low-NOx Firing Conditions". In The Impact of Ash Deposition on Coal Fired Plants, 113–22. Boca Raton: Routledge, 2022. http://dx.doi.org/10.1201/9780203736616-12.

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Adeyemi, Idowu A., e Isam Janajreh. "Detailed Kinetics-Based Entrained Flow Gasification Modeling of Utah Bituminous Coal and Waste Construction Wood Using Aspen Plus". In ICREGA’14 - Renewable Energy: Generation and Applications, 607–22. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-05708-8_49.

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Kamalanathan, Premkumar, e Rajesh Kumar Upadhyay. "Measurement Techniques: Cold Flow Studies". In Coal and Biomass Gasification, 175–206. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7335-9_7.

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Agarwal, Ramesh K., Mengqiao Yang e Subhodeep Banerjee. "Transient Cold Flow Simulation of a Fast Fluidized Bed Fuel Reactor for Chemical Looping Combustion". In Coal and Biomass Gasification, 331–47. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7335-9_13.

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Liu, Zhen, Jiansheng Zhang e Fenghua Zhang. "A Simplified Equilibrium Model for Simulating Entrained Flow Gasifiers". In Clean Coal Technology and Sustainable Development, 531–39. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2023-0_72.

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Hallgren, Anders, Lars A. Andersson e Ingemar Bjerle. "High Temperature Gasification of Biomass in an Atmospheric Entrained Flow Reactor". In Advances in Thermochemical Biomass Conversion, 338–49. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1336-6_26.

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Xu, H. P., H. B. Zhao e C. G. Zheng. "Numerical Simulation of an Entrained Flow Gasifier by an Eulerian Model". In Clean Coal Technology and Sustainable Development, 585–90. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2023-0_79.

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Feng, Z. Y., Z. Liu, X. H. Fang, F. H. Zhang, B. Z. Peng e Z. J. Gong. "Modeling of Cold Flow Field in an Entrained-Flow Gasifier with Single or Multiple Injectors". In Clean Coal Technology and Sustainable Development, 575–84. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2023-0_78.

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Atti di convegni sul tema "Entrained flow coal gasification"

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Bhatnagar, Ankit, e S. Pushpavanam. "Efficiency Improvement in Entrained Flow Gasification". In ASME/JSME 2011 8th Thermal Engineering Joint Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajtec2011-44307.

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Abstract (sommario):
In this work a one dimensional steady state model is developed for a single stage and two-stage bottom fed entrained flow coal gasifier for. The single stage model was first analysed for two different oxidants (i) oxygen and (ii) air to study their effects on gasification. Analysis proved oxygen to be the better oxidant. The model is then extended to a two stage gasifier. Here 30 (70) percent of the coal is fed in the first stage (second stage). The first (second) stage operates in oxidant rich (lean) environment. The performances of single stage and two-stage models are compared in terms of their cold gas efficiencies for the same coal feed rates. It is observed that a two-stage system has better cold gas efficiency (77%) than a single stage system (72%) with lower oxygen consumption. The two-stage model is used to optimise the O2/Coal ratio as the H2O/Coal ratio is varied in the 2nd stage. The optimum yields the highest cold gas efficiency with minimum possible oxygen consumption.
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Du, Min, Yingli Hao e Sheng Liu. "Numerical Study on Coal Gasification in Texaco Entrained-Flow Coal Gasifier". In 2009 Asia-Pacific Power and Energy Engineering Conference. IEEE, 2009. http://dx.doi.org/10.1109/appeec.2009.4918551.

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Zhang, Cheng. "Numerical Modeling of Coal Gasification in an Entrained-Flow Gasifier". In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88481.

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Abstract (sommario):
The gasification technology has been applied in Integrated Gasification Combined Cycle (IGCC) plants for the production of power, and polygeneration plants for the production of industrial chemicals, fuels, hydrogen, and power. The major advantages of the gasification technology are its potential for feed-stock flexibility, product flexibility, and relative simple removal of harmful emissions of nitrogen oxides (NOx), sulfur oxides (SOx), and CO2. Entrained-flow gasifiers are the preferred gasifier design for future deployment due to their high carbon conversion, high efficiency and high syngas purity. Current entrained-flow gasifier designs still have serious problems such as injector failure, refractory failure, slag blockages, downstream fouling and poisoning, poor space efficiency, and lack of dynamic feedstock flexibility. To better understand the entrained-flow gasification process, we performed steady Reynolds-averaged Navier-Stokes (RANS) modeling of the laboratory-scale gasifier developed at Brigham Young University (BYU) using ANSYS Fluent. An Eulerian approach is used to describe the gas phase, and a Lagrangian approach is used to describe the particle phase. The interactions between the gas phase and particle phase is modeled using the particle-source-in-cell approach. Turbulence is modeled using the shear-stress transport (SST) k–ω model. Turbulent particle dispersion is taken into account by using the discrete random walk model. Devolatilization is modeled using a version of the chemical percolation devolatilization (CPD) model, and char consumption is described with a shrinking core model. Turbulent combustion in the gas phase is modeled using a finite-rate/eddy-dissipation model. Radiation is considered by solving the radiative transport equation with the discrete ordinates model. Second-order upwind scheme is used to solve all gas phase equations. First, to validate the flow solver, we performed numerical modeling of a non-reacting particle-laden bluff-body flow. For the non-reacting flow, the predicted mean velocities of the gas phase and the particle phase are in good agreement with the experimental data. Next, we performed numerical modeling of the gasification process in the BYU gasifier. The predicted profiles of the mole fractions of the major species (i.e. CO, CO2, H2, and H2O) along the centerline are in reasonable agreement with the experimental data. The predicted carbon conversion at the gasifier exit agrees with the experimental data. The predicted temperature at the gasifier exit agrees with the estimated value based on water-gas shift equilibrium considerations. The numerical model was further applied to study the effects of the equivalence ratio, particle size, and swirl on the gasification process.
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Zhang, Cheng, Kiel Schultheiss, Aniruddha Mitra e Mosfequr Rahman. "Parametric Studies of Coal Gasification in an Entrained-Flow Gasifier". In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51966.

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Abstract (sommario):
Although alternative energy sources, such as nuclear, wind, and solar, are showing great potential, hydrocarbon fuels are expected to continue to play an important role in the near future. There is an increasing interest in developing technologies to use hydrocarbon fuels cleanly and efficiently. The gasification technology that converts hydrocarbon fuels into syngas is one of these promising technologies. Entrained-flow gasifiers are the preferred gasifier design for future deployment due to their high carbon conversion, high efficiency and high syngas purity. Current designs of entrained-flow gasifiers still have serious problems such as injector failure, refractory failure, slag blockages, downstream fouling and poisoning, poor space efficiency, and lack of dynamic feedstock flexibility. To better understand the entrained-flow gasification process, we performed parametric studies of coal gasification in the laboratory-scale gasifier developed at Brigham Young University (BYU) using ANSYS FLUENT. An Eulerian approach was used to describe the gas phase, and a Lagrangian approach was used to describe the particle phase. The interactions between the gas phase and particle phase was modeled using the particle-source-in-cell approach. Turbulence was modeled using the standard k-ε model. Turbulent particle dispersion was taken into account by using the discrete random walk model. Devolatilization was modeled using a version of the chemical percolation devolatilization (CPD) model, and char consumption was described with a shrinking core model. Turbulent combustion in the gas phase was modeled using a finite-rate/eddy-dissipation model. Radiation was considered by solving the radiative transport equation with the discrete ordinates model. Second-order upwind scheme was used to solve all gas phase equations. First, the numerical model was validated by using experimental data for the mole fractions of the major species (CO, CO2, H2, and H2O) along the gasifier centerline. Then, the effects of concentrations of steam and oxygen at the inlets, and steam preheat temperature were studied. Model predictions found that increasing the steam concentration or steam preheat temperature in the secondary inlet generally decreases CO concentration, while increasing CO2 and H2 concentrations. Increasing the steam concentration in the secondary inlet showed no significant effects on predicted gas temperature in the gasifier. Increasing the oxygen concentration in the primary inlet generally increases gas temperature, CO and CO2 concentrations, while decreasing H2 concentration.
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Watanabe, Hiroaki, Kazuyoshi Ichikawa, Maromu Otaka e Jun Inumaru. "Numerical Simulation of Coal Ash Particle Behavior in Entrained Flow Coal Gasifier". In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45744.

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The objective of this study is to develop an evaluation tool for a design and performance of a coal gasifier by a numerical simulation technique. In the present paper, a gas-particle two phase reacting flow calculation is carried out for a prediction of phenomena in an entrained flow coal gasifier due to coal and ash particles behavior, such as ash deposition on the wall. A transportation of the coal particles is modeled via a Lagrangian manner. The ash particle adhesion on the wall of the gasifier is discriminated by an empirical ash adhesion model based on a liquid phase fraction concept in the ash particle. The gas phase properties are calculated by three dimensional time-mean Eulerian conservation equations. The turbulent flow field is determined by the k-ε two equations model. Radiative heat transfer is calculated by the discrete transfer radiation method. Coal gasification reaction model is composed of three chemical processes in the current model: a pyrolysis, a char gasification and gas phase reactions. 2 tons/day (t/d) air-blown pressurized entrained flow coal gasifier, which has been constructed and operated by Central Research Institute of Electric Power Industry (CRIEPI) was targetted. As a result, a relationship between an operating condition (air ratio) of the gasifier and the gasifier performance is presented. The trend of the ash deposition on the gasifier inner wall is also presented. Comparison between the computational and the experimental results shows that the most feature of the gasifier performance and the profile of the ash deposition have been captured by the present model. It was confirmed that the numerical simulation approach is very useful for the assessment of gasifier performance and operation support.
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Aijun Wang, Xiaotao Zhang, Hongqiang Zhang, H. Arellano-Garcia e G. Wozny. "Performance evaluation of biomass co-gasification with coal in entrained-flow gasifirer". In Environment (ICMREE). IEEE, 2011. http://dx.doi.org/10.1109/icmree.2011.5930867.

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Monaghan, Rory F. D., Mayank Kumar, Simcha L. Singer, Cheng Zhang e Ahmed F. Ghoniem. "Reduced Order Modeling of Entrained Flow Solid Fuel Gasification". In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-12985.

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Reduced order models that accurately predict the operation of entrained flow gasifiers as components within integrated gasification combined cycle (IGCC) or polygeneration plants are essential for greater commercialization of gasification-based energy systems. A reduced order model, implemented in Aspen Custom Modeler, for entrained flow gasifiers that incorporates mixing and recirculation, rigorously calculated char properties, drying and devolatilization, chemical kinetics, simplified fluid dynamics, heat transfer, slag behavior and syngas cooling is presented. The model structure and submodels are described. Results are presented for the steady-state simulation of a two-metric-tonne-per-day (2 tpd) laboratory-scale Mitsubishi Heavy Industries (MHI) gasifier, fed by two different types of coal. Improvements over the state-of-the-art for reduced order modeling include the ability to incorporate realistic flow conditions and hence predict the gasifier internal and external temperature profiles, the ability to easily interface the model with plant-wide flowsheet models, and the flexibility to apply the same model to a variety of entrained flow gasifier designs. Model validation shows satisfactory agreement with measured values and computational fluid dynamics (CFD) results for syngas temperature profiles, syngas composition, carbon conversion, char flow rate, syngas heating value and cold gas efficiency. Analysis of the results shows the accuracy of the reduced order model to be similar to that of more detailed models that incorporate CFD. Next steps include the activation of pollutant chemistry and slag submodels, application of the reduced order model to other gasifier designs, parameter studies and uncertainty analysis of unknown and/or assumed physical and modeling parameters, and activation of dynamic simulation capability.
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Abaimov, N. A., E. B. Butakov, A. P. Burdukov e A. F. Ryzhkov. "Investigation of steam-air-blown two-stage entrained-flow gasification of mechanoactivated coal". In PHYSICS, TECHNOLOGIES AND INNOVATION (PTI-2018): Proceedings of the V International Young Researchers’ Conference. Author(s), 2018. http://dx.doi.org/10.1063/1.5055074.

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Du, Min, Yingli Hao e Yan Wang. "Numerical Simulation of Coal Gasification in a 1 t/h Two-Stage Entrained Flow Gasifier". In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43303.

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Coal gasification has received increasing attention in the past two decades due to the growing demand for clean gaseous fuels. Numerical simulations of the coal gasification process inside a two-stage dry feed entrained flow gasifier were carried out using the commercial CFD solver FLUENT. The predicted main product gas components and carbon conversion were in well agreement with the measured data, which verified the validity of the model. A series of calculations were carried out to investigate the effects of operating parameters on the performance of gasifier, including the coal particle size, coal type and coal feeding ratio between the first and the second stages. The flow field, coal particle deposition on the wall, gas temperature and mole fraction inside of the gasifier were analyzed. And the simulation results indicated that the performance of gasifier is improved with decreasing particle size. The low volatile component fraction or high ash content in coal is not propitious to the gasification performance. And the performance of gasifier of the case with coal distribution with 75% (first stage) vs. 25% (second stage) is better than the case with 50% (first stage) vs. 50% (second stage) and the case with 100% for the first stage. The calculation is helpful for designing the operating conditions of the gasifier.
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Roy, Arnab, Srinath V. Ekkad e Uri Vandsburger. "Prediction and Validation of Performance of an Entrained Flow Gasifier Model". In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-63770.

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Computational fluid dynamics (CFD) simulation of a single stage, dry-feed entrained flow gasifier is carried out to predict several physical and chemical processes within the gasifier. The model is developed using a commercial software package FLUENT. The CFD model is based on an Eulerian-Lagrangian framework, where the continuous fluid phase is modeled in Eulerian approach and the particle flow trajectory is simulated in Lagrangian frame. The two phases are coupled by appropriate source terms in the conservation equations. The gasification process can be divided into the following sub-processes, which are inert heating, moisture release, coal devolatilization, char gasification and gas phase reactions. Discrete Phase Model (DPM) is used to model the coal particles and coupled with heterogeneous particle surface reactions in Species Transport module. The interaction between reaction chemistry and turbulence is described by Finite-rate/Eddy dissipation model. The simulation provides detailed information of temperature field and species concentration profile inside the gasifier. The temperature distribution clearly indicates the three different reaction zones for devolatilization, gasification and reduction. Steady state model predictions are compared with benchmark experimental data from literature. The trend of the predicted species mole fraction distribution is in good agreement within error bound of the experiment. The model thus provides a validated set of model parameters along with an insight to the underlying flow physics and chemical reactions of gasification process that can be employed to improve design of experiments. This study also develops the basis to achieve further accuracy incorporating complex effects such as detailed reaction kinetic mechanisms, proper devolatilization models, effect of ash-slag transition and particle deposition.
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Rapporti di organizzazioni sul tema "Entrained flow coal gasification"

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Maghzi, Shawn, Ramanathan Subramanian, George Rizeq, Surinder Singh, John McDermott, Boris Eiteneer, David Ladd, Arturo Vazquez, Denise Anderson e Noel Bates. Product Characterization for Entrained Flow Coal/Biomass Co-Gasification. Office of Scientific and Technical Information (OSTI), settembre 2011. http://dx.doi.org/10.2172/1084032.

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Maghzi, Shawn, Ramanathan Subramanian, George Rizeq, Surinder Singh, John McDermott, Boris Eiteneer, David Ladd, Arturo Vazquez, Denise Anderson e Noel Bates. Product Characterization for Entrained Flow Coal/Biomass Co-Gasification. Office of Scientific and Technical Information (OSTI), dicembre 2011. http://dx.doi.org/10.2172/1048879.

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Anderson, C. M. Subtask 3.16 - Low-Cost Coal-Water Fuel for Entrained-Flow Gasification. Office of Scientific and Technical Information (OSTI), ottobre 1997. http://dx.doi.org/10.2172/3812.

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Fu, R. Assessment of modular IGCC (integrated gasification combined cycle) plants based on entrained flow coal gasification. Office of Scientific and Technical Information (OSTI), giugno 1989. http://dx.doi.org/10.2172/6914200.

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Celik, I., e M. Chattree. Trend analysis of coal gasification product yields in an entrained flow reactor. Office of Scientific and Technical Information (OSTI), ottobre 1989. http://dx.doi.org/10.2172/6991221.

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Anderson, C. M. Task 3.16 -- Low-cost coal-water fuel for entrained-flow gasification. Semi-annual report, July 1--December 31, 1995. Office of Scientific and Technical Information (OSTI), gennaio 1998. http://dx.doi.org/10.2172/633997.

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Burton Davis, Gary Jacobs, Wenping Ma, Khalid Azzam, Janet ChakkamadathilMohandas e Wilson Shafer. Sensitivity of Fischer-Tropsch Synthesis and Water-Gas Shift Catalystes to Poisons form High-Temperature High-Pressure Entrained-Flow (EF) Oxygen-Blown Gasifier Gasification of Coal/Biomass Mixtures. Office of Scientific and Technical Information (OSTI), settembre 2009. http://dx.doi.org/10.2172/1002145.

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Burtron Davis, Gary Jacobs, Wenping Ma, Khalid Azzam, Dennis Sparks e Wilson Shafer. Sensitivity of Fischer-Tropsch Synthesis and Water-Gas Shift Catalysts to Poisons from High-Temperature High-Pressure Entrained-Flow (EF) Oxygen-Blown Gasifier Gasification of Coal/Biomass Mixtures. Office of Scientific and Technical Information (OSTI), settembre 2010. http://dx.doi.org/10.2172/1002146.

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Davis, Burton, Gary Jacobs, Wenping Ma, Dennis Sparks, Khalid Azzam, Janet Chakkamadathil Mohandas, Wilson Shafer e Venkat Ramana Rao Pendyala. Sensitivity of Fischer-Tropsch Synthesis and Water-Gas Shift Catalysts to Poisons from High-Temperature High-Pressure Entrained-Flow (EF) Oxygen-Blown Gasifier Gasification of Coal/Biomass Mixtures. Office of Scientific and Technical Information (OSTI), settembre 2011. http://dx.doi.org/10.2172/1052997.

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Leininger, T. F., A. Robin, D. Y. Jung, J. S. Kassman, J. K. Wolfenbarger e P. P. Yang. Integration and testing of hot desulfurization and entrained flow gasification for power generation systems. Office of Scientific and Technical Information (OSTI), novembre 1992. http://dx.doi.org/10.2172/10107050.

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