8. Application to underground coal gasification (UCG) UCG, a clean coal technology, is widely understood as a disruptive mining method that is efficient and environmentally benign. This method extracts deep and stranded coal by performing complex gasification reactions insitu within the coal seam.
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Underground coal gasification (UCG) is an alternative way to convert underground coal reserves into a synthesis gas (syngas), such as methane, hydrogen, and carbon monoxide, in situ, where it is infeasible or uneconomical for traditional mining methods [1,2,3,4].UCG has the potential to be a more environmentally friendly and costeffective way to extract energy from coal, as it can reduce the ...
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Underground coal gasification (UCG) has been shown to be a promising method for deep coal resources. A series of complicated chemical reactions can induce a considerable change in the pore structure of coal and thus promote the UCG process in turn. Currently, most studies on the effect of elevated temperature on the pore structure of coal were not involved in an air atmosphere, bringing a ...
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The Controlled Retracting Injection Point (CRIP) process for underground coal gasification (UCG) was successfully demonstrated during the Rocky Mountain I (RM I) field test conducted in the winter of 198788 near Hanna, Wyoming. The basic features for the CRIP process are its ability to maintain oxidant injection low in the coal seam by ...
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Underground coal gasification (UCG) is the process of converting hydrocarbon materials into synthesis gas insitu. Underground coal gasification is sometimes referred to as insitu coal gasification (ISCG). The process has been developed over more than a century, though only a few projects currently operate on a continuous basis.
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During deep underground coal gasification, the semicoke produced by the pyrolysis of dense coal cores is an important material for its gasification and combustion. In this paper, pressurized pyrolysis experiments were carried out on dense coal cores at 700 °C and pressures of 1, 2, and 3 MPa using a shaft furnace. The resulting semicoke and raw coal were analyzed using the characterization ...
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In the underground coal gasification (UCG) process, a feasible method for the redn. of CO2 emissions is to capture the CO2 present in syngas and reinject it as one of the gasification agents, which is called CO2 recycling. In this process, CO2 partially replaces steam as a gasification agent, which is of particular importance in areas lacking ...
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Underground Coal Gasification (UCG) requires monitoring of the gasification area because the gasification process is invisible and the reaction temperature exceeds 1000 °C. Many fracturing events ...
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article{osti_, title = {Underground coal gasification: An overview of groundwater contamination hazards and mitigation strategies}, author = {Camp, David W. and White, Joshua A.}, abstractNote = {Underground coal gasification is the in situ conversion of coal into an energyrich product gas. It takes place deep underground, using chemical reactions to consume the coal and grow a cavity.
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The growth state of the combustion cavity during underground coal gasification (UCG) affects the gasification process's efficiency, stability, and accurate monitoring and control. In this study, a simulation experiment of UCG was performed, and a horizontal coaxial gasification channel was drilled based on the constructed artificial coal seam.
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The technical feasibility of underground coal gasification (UCG) has been established through many field trials and laboratoryscale experiments over the past decades. However, the UCG is site specific and the commercialization of UCG is being hindered due to the lack of complete information for a specific site of operation. Since conducting UCG trials and data extraction are costly and ...
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The coal is converted into syngas during the underground coal gasification process in the coal seam (, in situ). The gas is produced and extracted by a well drilled into the gasified coal seam. The injection well is used to inject oxidants,, air, oxygen, vapor, or their mixture. The injection well also serves to ignite the coal seam at ...
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Underground Coal Gasification ("UCG") is a longstanding, proven process for converting coal to a synthetic gas ("syngas") with a wide range of potential end uses. Its commercial development has been restricted due to the need to match resource and end use opportunities in a supportive environment, although it is
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Coal gasification is a promising option for the future use of coal. Similarly to gasification in industrial reactors, underground coal gasification (UCG) produces syngas, which can be used for power generation or for the production of liquid hydrocarbon fuels and other valuable chemical products. As compared with conventional mining and surface gasification, UCG promises lower capital ...
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By igniting in the coal seam and injecting gas agent, underground coal gasification (UCG) causes coal to undergo thermochemical reactions in situ and, thus, to be gasified into syngas for power generation, hydrogen production, and storage. Compared with traditional mining technology, UCG has the potential sustainable advantages in energy, environment, and the economy. The paper reviewed the ...
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The Underground Coal Gasification (UCG) process is a complex and multiphysics phenomenon, thus making it difficult to develop a mathematical model that encapsulates all dynamical aspects. In this regard, datadriven modeling techniques offer a reliable alternative for prediction, control, and optimization of dynamical systems, but their ...
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The Underground Coal Gasification (UCG) process is a complex and multiphysics phenomenon, thus making it difficult to develop a mathematical model that encapsulates all dynamical aspects. In this regard, datadriven modeling techniques offer a reliable alternative for prediction, control, and optimization of dynamical systems, but their ...
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6. COAL GASIFICATION UNDERGROUND COAL GASIFICATION (UCG) PROCESS • Under the process of UCG, gasification of coal happens insitu by controlled burning. • About 350 m3 gas can be produced per tonne of coal. • Bye products of significant commercial value will be hydrocarbons, phenols, anhydrous NH3and clean water • UCG overcomes hazards of underground and open cast mining operations.
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Coal ignition is initiated through the use of an electric coil or gas firing near the face of the coal seam. Continuous oxidant flow through the injection well allows for gasification to be sustained [].The temperature of the gasification process is maintained through varying the oxidant flow to the reactor [].In UCG systems, the temperature of the coal face can reach temperatures in excess of ...
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1. Technical connotation of underground coal gasification Concept Underground coal gasification (UCG) refers to the process of producing CH4, H2 and other combustible gases through controlled combustion of coal in situ in the strata with appro priate engineering technology[1ï€6].
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In this study the characteristics of Turkish lignite for underground coal gasification process was experimentally investigated in a laboratory scale ex situ reactor. A rectangular prism shaped ex ...
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Underground coal gasification (UCG) has its own reaction characteristics with the growth of the combustion cavity because the coal seam is fixed while the gasification face moves. The theoretical understanding of UCG requires continuous and deep research. In order to explain the UCG mechanism by means of simulation calculation, based on the analysis of the reaction process of UCG, radial and ...
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Underground coal gasification (UCG) converts coal insitu into a gaseous product, commonly known as synthesis gas or syngas through the same chemical reactions that occur in surface gasifiers. ... CO2, and H2O (steam), with many of the coal impurities converted to gaseous species such as H2S and NH3. The gasification process is typically ...
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Underground coal gasification (UCG) is a complex process as it depends on many factors such as geological and geohydrological analysis of strata, physical and chemical properties of coal, operational process parameters, seismic events, analysis of produced gases in realtime.
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Increasing global energy demand is a central challenge of the 21st century. Apart from renewable energy concepts, sustainable bridging and buffering technologies are needed which simultaneously offer longterm energy supply guarantees. Underground coal gasification (UCG) shows a promising potential to meet these requirements of future energy markets by in situ conversion of coal to a valuable ...
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With underground coal gasification (UCG), the actual process takes place underground, generally below 1,200 feet. The underground setting provides both the feedstock source as well as pressures comparable to that in an aboveground gasifier. With most UCG facilities, two wells are drilled on either side of an underground coal seam.
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The Controlled Retracting Injection Point (CRIP) process for underground coal gasification (UCG) was successfully demonstrated during the Rocky Mountain I (RM I) field test conducted in the winter of 198788 near Hanna, Wyoming. The basic features for the CRIP process are its ability to maintain oxidant injection low in the coal seam by ...
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Underground coal gasification (UCG) ... The notable products in a coal pyrolysis process encompass CO, H 2, CH 4, CO 2, H 2 O, char, and to a lesser amount tar and hydrocarbons. It is thus evident that the generation of H 2 occurs principally in the reduction and pyrolysis categories.
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Abstract. Underground coal gasification is a conversion and extraction process, for the production of useful synthetic product gas from an insitu 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 ...
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Underground Coal Gasification (UCG) takes advantage of the same chemical reactions of coal to produce product gases, as those occurring in conventional gasifier reactors. The main difference is that in UCG the underground coal seam itself becomes the reactor, so that the gasification of the coal takes place underground instead of in a manufactured gasification vessel at the Obviously ...
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Underground coal gasification (UCG) is an industrial gasification process, which is carried out in nonmined coal seams. It involves injection of a gaseous oxidizing agent, usually oxygen or air, and bringing the resulting product gas to the surface through production wells drilled from the surface.
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UCG Process. Underground Coal Gasification is a chemical process that converts underground coal into a mixture of gaseous products insitu (meaning the process happens in the coal reservoirs). [4] The main products include methane, hydrogen, carbon monoxide and carbon dioxide. [5] Methane is a natural gas and a combustible energy source.
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