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Letteratura scientifica selezionata sul tema "Underground coal gasification"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 30 luglio 2024

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Articoli di riviste sul tema "Underground coal gasification"

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, n. 1 (23 luglio 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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Wei, Minghui, Yilin He, Aihua Deng e Qiuyang Tao. "Research on Temperature Simulation of Underground Coal Gasification Wellbore". Academic Journal of Science and Technology 8, n. 3 (28 dicembre 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, Dusko Djukanovic, Dragana Petrovic e Igor Svrkota. "Contribution to creating a mathematical model of underground coal gasification process". Thermal Science 23, n. 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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Kačur, Ján, Marek Laciak, Milan Durdán e Patrik Flegner. "Investigation of Underground Coal Gasification in Laboratory Conditions: A Review of Recent Research". Energies 16, n. 17 (28 agosto 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.

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Kreinin, E. V., e A. Yu Zorya. "Underground coal gasification problems". Solid Fuel Chemistry 43, n. 4 (agosto 2009): 215–18. http://dx.doi.org/10.3103/s0361521909040053.

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Saik, Pavlo, Volodymyr Falshtynskyi, Vasyl Lozynskyi, Roman Dychkovskyi, Mykhailo Berdnyk e Edgar Cabana. "Substantiating the operating parameters for an underground gas generator as a basic segment of the mining energy-chemical complex". IOP Conference Series: Earth and Environmental Science 1156, n. 1 (1 aprile 2023): 012021. http://dx.doi.org/10.1088/1755-1315/1156/1/012021.

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Abstract This paper presents the main aspects of changing the coal mining technology based on the introduction of underground coal gasification technology for the mining-geological conditions of the occurrence of State Enterprise “Lvivvuhillia” coal seams on the example of “Chervonohradska” mine. When conducting analytical studies using the “Material-heat balance of underground coal gasification” software, predictive quantitative-qualitative indicators of the injected blast mixture and gasification products have been determined depending on the structure and elemental composition of the coal seam, host rocks, water saturation of the seam, and water inflow into the gasification channel. The heat energy loss of an underground gas generator during the gasification of thin and ultra-thin coal seams has been revealed. The heat and energy capacity of the underground gas generator has been determined depending on the type of supply of the injected blast mixture to the combustion face “mirror” and the performance indicators of the gas generator segment within the mining energy-chemical complex taking into account the quantitative-qualitative indicators of generator gas and liquid chemical raw material of the condensate.

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Petrovic, David, Lazar Kricak, Milanka Negovanovic, Stefan Milanovic, Jovan Markovic, Nikola Simic e Ljubisav Stamenic. "Valorization of non-balanced coal reserves in Serbia for underground coal gasification". Thermal Science 23, n. 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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Durdán, Milan, Marta Benková, Marek Laciak, Ján Kačur e Patrik Flegner. "Regression Models Utilization to the Underground Temperature Determination at Coal Energy Conversion". Energies 14, n. 17 (1 settembre 2021): 5444. http://dx.doi.org/10.3390/en14175444.

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The underground coal gasification represents a technology capable of obtaining synthetic coal gas from hard-reached coal deposits and coal beds with tectonic faults. This technology is also less expensive than conventional coal mining. The cavity is formed in the coal seam by converting coal to synthetic gas during the underground coal gasification process. The cavity growth rate and the gasification queue’s moving velocity are affected by controllable variables, i.e., the operation pressure, the gasification agent, and the laboratory coal seam geometry. These variables can be continuously measured by standard measuring devices and techniques as opposed to the underground temperature. This paper researches the possibility of the regression models utilization for temperature data prediction for this reason. Several regression models were proposed that were differed in their structures, i.e., the number and type of selected controllable variables as independent variables. The goal was to find such a regression model structure, where the underground temperature is predicted with the greatest possible accuracy. The regression model structures’ proposal was realized on data obtained from two laboratory measurements realized in the ex situ reactor. The obtained temperature data can be used for visualization of the cavity growth in the gasified coal seam.

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Saik, P., V. Lozynskyi, D. Malachkevych e O. Cherniaіeva. "To the issue of underground gasification of low-thickness unconditioned coal reserves". Collection of Research Papers of the National Mining University 71 (dicembre 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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Zha, Xiao Xiong, Hai Yang Wang e Shan Shan Cheng. "Finite Element Analysis of the Subsidence of Cap Rocks during Underground Coal Gasification Process". Advanced Materials Research 859 (dicembre 2013): 91–94. http://dx.doi.org/10.4028/www.scientific.net/amr.859.91.

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This paper discusses the possible surface subsidence and deformation of the overlying rock during the underground coal gasification (UCG) process, which is an important part of feasibility studies for UCG operations. First coal seam roof movement and surface subsidence in the shallow UCG process were simulated by a finite element model coupled with heat transfer module in COMSOL. Numerical results from this model were compared with and in good agreement to the existing studies. This was followed by the development of model for deeper coal seam cases. The comparison of the numerical results from two models shows that surface uneven settlement in deep underground coal gasification is only 7% of that in shallow underground coal gasification.

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Tesi sul tema "Underground coal gasification"

Perkins, Gregory Martin Parry Materials Science &amp Engineering Faculty of Science UNSW. "Mathematical modelling of underground coal gasification". Awarded by:University of New South Wales. Materials Science and Engineering, 2005. http://handle.unsw.edu.au/1959.4/25518.

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Mathematical models were developed to understand cavity growth mechanisms, heat and mass transfer in combination with chemical reaction, and the factors which affect gas production from an underground coal gasifier. A model for coal gasification in a one-dimensional spatial domain was developed and validated through comparison with experimental measurements of the pyrolysis of large coal particles and cylindrical coal blocks. The effects of changes in operating conditions and coal properties on cavity growth were quantified. It was found that the operating conditions which have the greatest impact on cavity growth are: temperature, water influx, pressure and gas composition, while the coal properties which have the greatest impact are: the thermo-mechanical behaviour of the coal, the coal composition and the thickness of the ash layer. Comparison of the model results with estimates from field scale trials, indicate that the model predicts growth rates with magnitudes comparable to those observed. Model results with respect to the effect of ash content, water influx and pressure are in agreement with trends observed in field trials. A computational fluid dynamics model for simulating the combined transport phenomena and chemical reaction in an underground coal gasification cavity has been developed. Simulations of a two-dimensional axi-symmetric cavity partially filled with an inert ash bed have shown that when the oxidant is injected from the bottom of the cavity, the fluid flow in the void space is dominated by a single buoyancy force due to temperature gradients established by the combustion of volatiles produced from the gasification of carbon at the cavity walls. Simulations in which the oxidant was injected from the top of the cavity reveal a weak fluid circulation due to the absence of strong buoyancy forces, leading to poor gasification performance. A channel model of gas production from underground coal gasification was developed, which incorporates a zero-dimensional cavity growth model and mass transfer due to natural convection. A model sensitivity study is presented and model simulations elucidate the effects of operating conditions and coal properties on gas production.

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Mortazavi, Hamid Reza. "Rubbling and structural stability of underground coal gasification reactors /". Thesis, Connect to this title online; UW restricted, 1989. http://hdl.handle.net/1773/7051.

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Roullier, Benjamin David. "Modelling the local environmental impact of underground coal gasification". Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/40878/.

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Underground coal gasification (UCG) has the potential to access vast resources of stored fossil energy in a safe, clean and environmentally sound manner. Previous experiments have however led to concerns around surface subsidence, groundwater pollution and water table lowering. These issues can be prevented through the use of appropriate site selection and an understanding of the processes which cause these effects. Numerical simulations provide a cost effective means of predicting these issues without the need for costly and publically opposed field trials. This work uses a commercially available discrete element code to simulate the coupled thermal, hydraulic and mechanical phenomena which cause environmental damage. Surface subsidence is predicted through the displacements of fully deformable discrete elements separated by a network of fractures. The flow of groundwater through these fractures is simulated in order to predict the effects of water table lowering and the inflow of groundwater into the UCG cavity. Heat conduction from the cavity walls is simulated using an explicit finite difference algorithm which predicts both thermal expansion effects and the influence of temperature on rock material properties. Comparison of results with experimental observations in the literature show good agreement for subsidence and groundwater behaviour, while initial predictions for a range of designs show clear relationships between environmental effects and operating conditions. Additional work is suggested to incorporate groundwater contaminant transport effects, and it is envisioned that the overall model will provide a valuable screening tool for the selection of appropriate site designs for the future development of UCG as an economically viable and environmentally sound source of energy.

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González, Martínez de Miguel Gerardo José. "A hydromechanically-based risk framework for CO₂ storage coupled to underground coal gasification". Thesis, University of Newcastle upon Tyne, 2014. http://hdl.handle.net/10443/2579.

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Most of the energy produced in the world comes from fossil fuels: coal, oil and gas. Amongst them, coal is the most abundant and widespread fossil fuel in the world. Underground Coal Gasi cation (UCG), an in situ method to extract the calori c value of the coal, has been known for a century but has had very limited implementation throughout the world, mainly due to the availability of cheap oil over that period. It is now gaining relevance in order to unlock vast resources of coal currently not exploitable by conventional mining. However, growing concern on increased levels of carbon dioxide concentration in the atmosphere is pointing out the necessity to reduce the use of fossil fuels. Since alternative sources of energy (e.g. nuclear and renewables) are not in a position to meet the constantly increasing demand in a short term, carbon capture and its geological sequestration (CCS) is considered the best remedial option. An environmental risk assessment framework has been developed for coupling UCG to CCS accounting for bene ts and cost from both global and local perspectives. A UCG site presents signi cant di erences from other typical CCS projected scenarios, most notably the injection of CO2 into a heavily fractured zone. A model which accounts for ow in fractures represented by dual-porosity ow (TOUGH2) is coupled to a geomechanical model (FLAC3D). The impact of this fractured zone in the CO2 injection pressure buildup and stress eld is evaluated. Furthermore the effect of stress-dependent fracture permeability is assessed with the hydro-mechanically i coupled compositional simulator GEM. Simulation results suggest that in such a scenario, CO2 injectivity and dissolution improve though con nement is compromised and commercial injection rates seem unattainable. The e ects of miscibility and relative permeability on pressure buildup implemented in semianalytical solutions are also evaluated. Albeit further research is required, a UCG operation may, therefore, not be able to accommodate the produced CO2 in the gasi ed cavity and its surroundings in a safe and economical fashion. Rigorous studies and management practices are needed to establish the requirements for secure long-term con nement of the carbon dioxide in such scenario.

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Hyder, Zeshan. "Site Characterization, Sustainability Evaluation and Life Cycle Emissions Assessment of Underground Coal Gasification". Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/28970.

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Underground Coal Gasification (UCG), although not a new concept, is now attracting considerable global attention as a viable process to provide a â cleanâ and economic fuel from coal. Climate change legislation and the declining position of coal reserves (i.e., deeper and thinner seams) in many parts of the world are promoting and fueling the UCG renaissance. This research presents an analysis of operational parameters of UCG technology to determine their significance and to evaluate the effective range of values for proper control of the process. The study indicates that cavity pressures, gas and water flow rates, development of linkage between wells, and continuous monitoring are the most important operating parameters. A protocol for the selection of suitable sites for UCG projects is presented in this study. The site selection criteria are developed based on successes and failures of previous experiments and pilot studies. The criteria take into account the site characteristics, coal quality parameters, hydrology of the area, availability of infrastructure and regulatory and environmental restrictions on sites. These criteria highlight the merits and demerits of the selected parameters, their importance in site selection and their economic and environmental potentials. Based on the site selection criteria, a GIS model is developed to assist in selecting suitable sites for gasification in any given area of interest. This GIS model can be used as a decision support tool as well since it helps in establishing the tradeoff levels between factors, ranking and scaling of factors, and, most importantly, evaluating inherent risks associated with each decision set. The potential of UCG to conform to different frameworks defined to assess the capability and potential of any project that merits the label, â sustainable,â has been evaluated. It has been established that UCG can integrate economic activity with ecosystem integrity, respect for the rights of future generations to the use of resources and the attainment of sustainable and equitable social and economic benefits. The important aspects of UCG that need to be considered for its sustainable development are highlighted. In addition, the environmental benefits of UCG have been evaluated in terms of its potential for reduction in greenhouse gas (GHG) emissions. The findings indicate that UCG significantly reduces GHG emissions compared to other competitive coal exploiting technologies. A model to compute the life cycle greenhouse emissions of UCG has been developed, and it reveals that UCG has distinctive advantages in terms of GHG emissions over other technologies and competes favorably with the latest power generation technologies. In addition to GHG emissions, the environmental impacts of these technologies based on various impact assessment indicators are assessed to determine the position of UCG in the technology mix. It is clear from the analysis that UCG has prominent environmental advantages and has the potential to develop and utilize coal resources in an environmentally friendly and economically sound manner.
Ph. D.

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Tian, Hong [Verfasser]. "Development of a thermo-mechanical model for rocks exposed to high temperatures during underground coal gasification / Hong Tian". Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2013. http://d-nb.info/1035674211/34.

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Nakaten, Natalie Christine [Verfasser]. "Economic competitiveness of underground coal gasification combined with carbon capture and storage in the Bulgarian energy network / Natalie Christine Nakaten". Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2015. http://d-nb.info/1076066712/34.

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Konstantinou, Eleni. "An experimental study on the impact of temperature, gasifying agents composition and pressure in the conversion of coal chars to combustible gas products in the context of Underground Coal Gasification". Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/98615/.

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The key controlling factor in the effective energy conversion of coal to combustible gases during the UCG process is the behaviour of the pyrolysed char in the reduction zone of the UCG cavity, which has not been published in available academic literature. This study investigates the impact of the operating parameters during the reduction zone of UCG using a bespoke high pressure high temperature rig which was developed as part of this research work. This rig, operating at temperatures of up to 900 oC and at pressures up to 5.0 MPa, simulates the UCG process including each UCG zone individually for a broad range of underground conditions to a depth of 500 m. Carbon dioxide and steam were used as the primary reductants with char derived from dry steam coal and anthracite sample. Carbon dioxide and steam were injected at a variety of pressures and temperatures, plus at a range of relative H2O/CO2 proportions. The composition of the resulting product gas of both coals was measured and subsequently used to calculate carbon conversion (X), carbon conversion of combustible gases ( ), cold gas efficiency (CGE) and low heating value (LHV) of the product gas. Optimal operating conditions were determined for the dry steam coal and anthracite that produced the best gas composition both at atmospheric and elevated pressure and are unique for each UCG system. A shrinking core model was employed to describe the behaviour of the pyrolised char to determine the activation energy and pre-exponential factor at atmospheric pressure for both coals. The evolution of the volatile matter of both coals and its contribution to the overall UCG performance was also determined. An optimum H2O/CO2 ratio was determined for both coals which enhanced the gasification rate of both coal chars up to the ratio of 2:1, above this ratio the effect saturated for both coals. It was shown that pressure increases the reduction-gasification process of the chars which suggests that there is an optimum operating pressure which produces a peak in carbon conversion, CGE and LHV for the product gas over the conditions tested that differs for each coal. Therefore UCG projects aiming at reaching higher pressures will not achieve an increase in the output, unless there are some new effects occurring above 4.0 MPa. Pressure enhances the gas solid reactions and almost doubles the max carbon conversion ( of combustible gases achieved at elevated pressure compared to that at atmospheric pressure. A shrinking core model was modified to take into account the effect of total pressure to the gasification rate of dry steam coal at 900 oC and pressures ranging from 0.7 to 1.65 MPa. Reaction constants for various pressures at 900 oC were determined for both coal chars. Analysis of data shown that typical UCG operations on low rank coals provides a combustible product gas that relies heavily on releasing the volatile matter from the coal and does not depend on the carbon conversion of char to gas which justifies the high CGE and LHV of the product gas found in the field trials. It was found that carbon conversion X is not significantly affected by the type of coal and that the carbon converted during UCG is between approximately 45% for high rank coals up to 55% for low rank coals. Experimental results were used to calculate the output, size and UCG model of a potential power plant which produced realistic solutions and proves that high rank coals can be suitable for UCG projects. Anthracite can produce almost the same amount of combustible gases as the dry steam coal operating under specific conditions but with a lower CGE and LHV which suggests that anthracite may be found to be more suitable for producing hydrocarbons with UCG than energy.

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Schrier, Loren Clare. "Identification of by-products and investigation into the dechlorination mechanism of the Chemchar cocurrent flow gasification process by gas chromatography-mass selective detection /". free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9904867.

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Thesis (Ph. D.)--University of Missouri-Columbia, 1998.
Trademark symbol follows Chemchar in title. Typescript. Vita. Includes bibliographical references (leaf 130). Also available on the Internet.

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Otto, Christopher [Verfasser], Michael [Akademischer Betreuer] Kühn e Thomas [Akademischer Betreuer] Kempka. "Numerical analysis of thermal, hydraulic and mechanical processes in the near- and far-field of underground coal gasification reactors / Christopher Otto ; Michael Kühn, Thomas Kempka". Potsdam : Universität Potsdam, 2017. http://d-nb.info/1218402946/34.

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Libri sul tema "Underground coal gasification"

Technology Information Forecasting and Assessment Council (India), a cura di. Underground coal gasification: Status, prospects & challenges. New Delhi: Technology Information, Forecasting, and Assessment Council, 2007.

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V, Stefanik I͡U. Geotekhnologii͡a nekondit͡sionnykh tverdykh topliv. Kiev: Nauk. dumka, 1990.

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Eugene, Boysen John, University of North Dakota. Energy and Environmental Research Center. e Gas Research Institute, a cura di. Detailed evaluation of process and environmental data from the Rocky Mountain 1 underground coal gasification field test: Final report. [Grand Forks, ND (P.O. Box 9018, Grand Forks, 58202-9018): Energy & Environmental Research Center, University of North Dakota, 1998.

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Gosnold, William D. Postgasification thermal regime of the Rocky Mountain 1 underground coal gasification test site: Topical report. [Grand Forks, ND (P.O. Box 9018, Grand Forks, 58202-9018): Energy & Environmental Research Center, University of North Dakota, 1998.

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Hassett, David J. Leaching and attenuation characteristics of unaltered and thermally altered materials from the Rocky Mountain 1 underground coal gasification field site: Topical report. [Grand Forks, ND (P.O. Box 9018, Grand Forks, 58202-9018): Energy & Environmental Research Center, University of North Dakota, 1998.

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United States. Mine Safety and Health Administration. Belt entry ventilation review: Report of findings and recommendations. [Washington, D.C.?]: U.S. Dept. of Labor, Mine Safety and Health Administration, 1989.

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A, Kühnel R., Gas Research Institute e Federal Energy Technology Center (U.S.), a cura di. Atlas of minerals and related phases in unaltered and thermally altered materials from the Rocky Mountain 1 underground coal gasification field site. Chicago, Ill: Gas Research Institute, 1998.

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Underground Coal Gasification and Combustion. Elsevier, 2018. http://dx.doi.org/10.1016/c2014-0-03452-1.

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Klimenko, Alexander Y., e Michael S. Blinderman. Underground Coal Gasification and Combustion. Elsevier Science & Technology, 2017.

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Klimenko, Alexander Y., e Michael S. Blinderman. Underground Coal Gasification and Combustion. Elsevier Science & Technology, 2017.

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Capitoli di libri sul tema "Underground coal gasification"

Gluyas, J. G. "Underground Coal Gasification". In Selective Neck Dissection for Oral Cancer, 1–4. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-02330-4_119-1.

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Shrivastava, Devansh. "Underground coal gasification modelling". In Modeling and Simulation of Fluid Flow and Heat Transfer, 19–33. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781032712079-2.

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Aghalayam, Preeti. "Cavity Models for Underground Coal Gasification". In Coal and Biomass Gasification, 207–21. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7335-9_8.

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Nikolaevich, Shabarov Arkady, Tsirel Sergey Vadimovich e Goncharov Evgeniy Vladimirovich. "Complex Technology of Underground Coal Gasification and Coal-Based Methane Recovery Using Geodynamic Zoning". In XVIII International Coal Preparation Congress, 505–11. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40943-6_77.

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Hettema, M. H. H., K. H. A. A. Wolf e C. J. de Pater. "Thermo-mechanical properties of roof rock of coal for underground gasification". In Topics in Applied Mechanics, 347–54. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-2090-6_38.

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L’Homme, G. A., J. P. Pirard e P. Ledent. "Oxy-Reactivity of Coal at Low Temperature and High Pressure During Great Depth Underground Gasification Tests". In Fundamental Issues in Control of Carbon Gasification Reactivity, 107–29. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3310-4_6.

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Wang, Jian-jun, Huan-zhen Zhao, Chao Zhang, Sheng Zhou, Xue-lei Hao e Xiang-yi Ren. "Study on Spray Cooling of Ultra-high Temperature Production Wellbore in Underground Coal Gasification". In Springer Series in Geomechanics and Geoengineering, 6805–15. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1964-2_579.

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Xin, Lin, Jing Wu, Bowei Wang, Maofei Niu, Jiaze Li, Weihao Xu, Xin Wang, Zhenjie Shang, Hualong Li e Yan Ma. "Study on Similar Material Ratio and Mechanical Properties of Surrounding Rock in Underground Coal Gasification". In Advances in Energy Resources and Environmental Engineering, 1397–408. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-42563-9_135.

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Fu, Xiaojin, Jing Wu, Bowei Wang, Mingze Feng, Kaixuan Li e Jiaze Li. "Study on pyrolysis characteristics of large-scale metabituminous coal in underground gasification based on thermogravimetric tests". In Energy Revolution and Chemical Research, 288–94. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003332657-42.

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Bhattacharyya, Sudip. "Greenfield Energies from Underground Coal Gasification and Liquefaction of Solid Fossil Fuels—Basics and Future Potentiality in India". In Macromolecular Characterization of Hydrocarbons for Sustainable Future, 185–210. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-6133-1_13.

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Atti di convegni sul tema "Underground coal gasification"

Kacur, Jan. "UNDERGROUND COAL GASIFICATION IN LABORATORY CONDITIONS". In SGEM2011 11th International Multidisciplinary Scientific GeoConference and EXPO. Stef92 Technology, 2011. http://dx.doi.org/10.5593/sgem2011/s18.118.

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Hong Son, Nguyen Le, Nguyen Hoang Anh e Hoang Ngoc Dong. "Review of Underground Coal Gasification Technologies". In 2016 3rd International Conference on Green Technology and Sustainable Development (GTSD). IEEE, 2016. http://dx.doi.org/10.1109/gtsd.2016.26.

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Mastalerz, Maria D., Agnieszka Drobniak e John A. Rupp. "POTENTIAL OF ILLINOIS BASIN COALS FOR UNDERGROUND COAL GASIFICATION". In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-316331.

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Sajjad, Mojibul, e Mohammad Rasul. "Underground Coal Gasification in abandoned Coal Seam Gas blocks". In 1st International e-Conference on Energies. Basel, Switzerland: MDPI, 2014. http://dx.doi.org/10.3390/ece-1-b002.

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Zhao, Yufeng, Zhen Dong, Yanpeng Chen, Hao Chen, Junjie Xue, Shanshan Chen, Mengyuan Zhang e Yan Peng. "Stress-Dependent Characteristics of Coal Permeability in Gasification Zone of Underground Coal Gasification". In 57th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2023. http://dx.doi.org/10.56952/arma-2023-0389.

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Abstract (sommario):

ABSTRACT Underground coal gasification (UCG) is an environment friendly way to produce coal resource and its efficiency depends on gas flow through porous medium. Therefore, the flow behavior especially the stress-dependent permeability characteristics are important topics for the UCG. The stress-dependent permeability characteristics in combustion zone are widely investigated, while, ones in gasification zone are rarely investigated but they are important for gas flow from injection wells to production wells. In this study, first, permeability tests for coal after heating below 500°C were conducted under various confining pressure. Secondly, microscopic structures of coal samples after heating were observed by the scanning electron microscope (SEM). Finally, the stress-dependent permeability characteristics of coal after heating were discussed and a model involving thermal-mechanical effect was built. The main results show that (1) permeability decreases and then increases with temperature. The increase magnitude of permeability becomes obvious at 200°C and it rises significantly up to 430% at 500°C. (2) the stress-dependent behavior of permeability decreases with temperature. The decrease magnitude can be 60%. (3) samples’ microscopic structures are affected by coal pyrolysis after heating and further affect permeability characteristics. Before 200°C, obvious change of microscopic structure is width increase of existing microscopic fractures. After 200°C, lots of new microscopic fractures are generated and macroscopic fractures may also be generated in some samples. (4) considering impacts of stress, thermal swelling and microscopic fracture generated by coal pyrolysis on permeability, a model is generated and its mean error is less than 4.3%. INTRODUCTION Underground coal gasification (UCG) technology, as a cutting-edge technology for clean coal, has developed rapidly in recent years and has also been the focus of academic and industrial circles[1]. This technology can mine deep and ultra-deep coal seams that cannot be mined by ordinary mining technology. The coal reserves of these coal reservoirs are often much higher than those of the middle and shallow coal seams. In addition, since the redox reaction occurs in the formation, the raw coal is converted into clean energy based on CO, CH4, and H2 in the original position[2]. This process leaves the ash produced by gasification in the ground and avoids environmental pollution. It also saves the cost of transporting coal to the ground under normal mining conditions [3].

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Biezen, E. N., Johannes Bruining e Johannes Molenaar. "An Integrated Model for Underground Coal Gasification". In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 1994. http://dx.doi.org/10.2118/28583-ms.

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Deng, Hui, Zhangxing Chen e Daiming Li. "Coupled Geomechanical Modeling of Underground Coal Gasification". In Canadian Unconventional Resources Conference. Society of Petroleum Engineers, 2011. http://dx.doi.org/10.2118/148829-ms.

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Biezen, E. N. J., J. Bruining e J. Molenaar. "An Integrated 3D Model for Underground Coal Gasification". In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 1995. http://dx.doi.org/10.2118/30790-ms.

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Centofanti, John. "Underground Coal Gasification: A New Source of Gas". In SPE Asia Pacific Oil & Gas Conference and Exhibition. Society of Petroleum Engineers, 2020. http://dx.doi.org/10.2118/202244-ms.

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Iwaszenko, Sebastian, e Karolina Nurzynska. "GPR data visualization for underground coal gasification process research". In IGARSS 2014 - 2014 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2014. http://dx.doi.org/10.1109/igarss.2014.6946761.

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Rapporti di organizzazioni sul tema "Underground coal gasification"

D. Steve Dennis. Underground Coal Gasification Test Project. Office of Scientific and Technical Information (OSTI), dicembre 2005. http://dx.doi.org/10.2172/914533.

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Yang, X., J. Wagoner e A. Ramirez. Monitoring of Underground Coal Gasification. Office of Scientific and Technical Information (OSTI), agosto 2012. http://dx.doi.org/10.2172/1345326.

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Friedmann, S., E. Burton e R. Upadhye. LLNL Capabilities in Underground Coal Gasification. Office of Scientific and Technical Information (OSTI), giugno 2006. http://dx.doi.org/10.2172/897981.

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Burton, E. A., R. Upadhye e S. J. Friedmann. Best Practices in Underground Coal Gasification. Office of Scientific and Technical Information (OSTI), settembre 2017. http://dx.doi.org/10.2172/1580018.

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Author, Not Given. Underground coal gasification program plan, FY 1988. Office of Scientific and Technical Information (OSTI), giugno 1988. http://dx.doi.org/10.2172/6389320.

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Dobbs, R. L. II, e W. B. Krantz. Combustion front propagation in underground coal gasification. Office of Scientific and Technical Information (OSTI), ottobre 1990. http://dx.doi.org/10.2172/6035494.

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Author, Not Given. Underground coal gasification program plan, FY 1989. Office of Scientific and Technical Information (OSTI), giugno 1989. http://dx.doi.org/10.2172/6124641.

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Upadhye, R., E. Burton e J. Friedmann. Science and Technology Gaps in Underground Coal Gasification. Office of Scientific and Technical Information (OSTI), giugno 2006. http://dx.doi.org/10.2172/897969.

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Siriwardane, H., e A. Layne. Ground movements associated with large-scale underground coal gasification. Office of Scientific and Technical Information (OSTI), settembre 1989. http://dx.doi.org/10.2172/6778771.

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Camp, David W., e Joshua A. White. Underground coal gasification: An overview of groundwater contamination hazards and mitigation strategies. Office of Scientific and Technical Information (OSTI), marzo 2015. http://dx.doi.org/10.2172/1378507.

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