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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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,, the operation pressure, the gasification agent, and the laboratory coal seam geometry. ...
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In underground insitu coal gasification, gas tightness is relative, and gas leakage is absolute. From proper preparation of the gasifier to operation and underground coal gasification work, the technology can reduce the loss of gas leakage caused by structure and process.
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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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Underground coal gasification (UCG) is a clean coal mining technology without significant environmental impacts. This technology can also be used in deep, hardtoreach seams or deposits affected ...
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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) requires monitoring of the gasification area because the gasification process is invisible and the reaction temperature exceeds 1000 °C. Many fracturing events that occurred due to coal heating can be captured with Acoustic Emission (AE) monitoring technique during UCG.
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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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A process to convert coal to gas which occurs underground. Coal, and volatiles embedded in the coal (mostly methane) are partially combusted in the presence of steam, oxygen and / or air, to produce hydrogen and carbon monoxide. ... Underground coal gasification. energy. A process to convert coal to gas which occurs underground. Coal, and ...
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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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1Introduction. Underground coal gasification (UCG) is the process in which air, steam and oxygen are injected into the insitu coal seams. Then the coal is ignited and converted into syngas (such as H 2, CO, CH 4, and CO 2) [[1], [2], [3]].During the UCG process, the temperature in the gasification face and cavity can normally reach °C [[1], [2]].
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Research on hydrogen production from coal gasification is mainly focused on the formation of CO and H 2 from coal and water vapor in hightemperature environments. However, in the process of underground coal gasification, the water gas shift reaction of lowtemperature steam will absorb a lot of heat, which makes it difficult to maintain the combustion of coal seams in the process of ...
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Underground coal gasification (UCG) is an insitu gasification technology where the controlled retreating injection point (CRIP) method is usually adopted to optimize the cavity evolution and gas production stability. ... A new model for evaluation of cavity shape and volume during Underground Coal Gasification process. Energy, Volume 148, 2018 ...
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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 link,, the gasification channel between the two wells, needs to be established in the target coal seam because the underground primitive conditions, surrounding rock characteristics, and coal properties cannot readily provide a porous gasification channel for the gas flow and ensure the continuation of the gasification process.
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Coal is an important source for power generation, currently supplying 41% of the global electricity demand. Also significant quantities of coal are employed in metallurgical processes, gasification, and cement industries as well as raw materials for activated carbon and some other industrial purposes [1].The limitation of the conventional coal mining methods for extracting seams located at ...
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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 underground coal gasification (UCG) process represents a modern and effective coal mining technology that enables coal energy extraction through thermic decomposition. The coal is transformed into syngas by oxidizers (, air, technical oxygen, or water steam) and is injected into a georeactor. The produced syngas is exhausted on the surface, where it is transformed into the desired form ...
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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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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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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 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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