首页|Effect of long reaction distance on gas composition from organic-rich shale pyrolysis under high-temperature steam environment
Effect of long reaction distance on gas composition from organic-rich shale pyrolysis under high-temperature steam environment
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When high-temperature steam is used as a medium to pyrolyze organic-rich shale,water steam not only acts as heat transfer but also participates in the chemical reaction of organic matter pyrolysis,thus affecting the generation law and release char-acteristics of gas products.In this study,based on a long-distance reaction system of organic-rich shale pyrolysis via steam injection,the effects of steam temperature and reaction distance on gas product composition are analyzed in depth and com-pared with other pyrolysis processes.The advantages of organic-rich shale pyrolysis via steam injection are then evaluated.The volume concentration of hydrogen in the gas product obtained via the steam injection pyrolysis of organic-rich shale is the highest,which is more than 60％.The hydrogen content increases as the reaction distance is extended;however,the rate of increase changes gradually.Increasing the reaction distance from 800 to 4000 mm increases the hydrogen content from 34.91％to 69.68％and from 63.13％to 78.61％when the steam temperature is 500 ℃ and 555 ℃,respectively.However,the higher the heat injection temperature,the smaller the reaction distance required to form a high concentration hydrogen pyrolysis environment(hydrogen concentration＞60％).When the steam pyrolysis temperature is increased from 500 ℃ to 555 ℃,the reaction distance required to form a high concentration of hydrogen is reduced from 3800 to 800 mm.Compared with the direct retorting process,the volume concentration of hydrogen obtained from high-temperature steam pyrolysis of organic-rich shale is 8.82 and 10.72 times that of the commonly used Fushun and Kivite furnaces,respectively.The pyrolysis of organic-rich shale via steam injection is a pyrolysis process in a hydrogen-rich environment.
Lei Wang、Rui Zhang、Guoying Wang、Jing Zhao、Dong Yang、Zhiqin Kang、Yangsheng Zhao
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Key Laboratory of In-Situ Property Improving Mining of Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China
The In-Situ Steam Injection Branch of State Center for Research and Development of Organic-Rich Shale Exploitation,Taiyuan University of Technology,Taiyuan 030024,China
School of Energy Science and Engineering,Henan Polytechnic University,Jiaozuo 454002,China
College of Mining Engineering,Taiyuan University of Technology,Taiyuan 030024,China
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Basic research program of Shanxi ProvinceBasic research program of Shanxi ProvinceNational Key R&D Program of ChinaKey R & D and promotion projects in Henan ProvinceNational Natural Science Foundation of ChinaNational Natural Science Foundation of China
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