Study on the Pore Structures and Adsorption Characteristics of Coking Coal of Liulin Mining in China Under the Condition of High Temperature and High Pressure
In order to study the change of pore structure and adsorption characteristics of coking coal after the high-temperature and high-pressure adsorption test, the coking coal from the Liulin coalmine was selected for the research. Both the mercury injection experiments were carried out on the raw coal a...
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Frontiers Media S.A.
2022-04-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.877462/full |
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| author | Qi Lingling Qi Lingling Qi Lingling Qi Lingling Peng Xinshan Wang Zhaofeng Wang Zhaofeng Wang Zhaofeng Wang Zhaofeng Chen Xiangjun Chen Xiangjun Chen Xiangjun Chen Xiangjun Dai Juhua |
| author_facet | Qi Lingling Qi Lingling Qi Lingling Qi Lingling Peng Xinshan Wang Zhaofeng Wang Zhaofeng Wang Zhaofeng Wang Zhaofeng Chen Xiangjun Chen Xiangjun Chen Xiangjun Chen Xiangjun Dai Juhua |
| author_sort | Qi Lingling |
| collection | DOAJ |
| description | In order to study the change of pore structure and adsorption characteristics of coking coal after the high-temperature and high-pressure adsorption test, the coking coal from the Liulin coalmine was selected for the research. Both the mercury injection experiments were carried out on the raw coal and the coal after the isothermal adsorption experiment processing with a pressure of 11 MPa and temperature ranging from 30 to 90°C. The results show that the pressure is beneficial to gas adsorption, while the temperature has a restraining effect on the gas adsorption of coking coal, and there is a good negative exponential relationship between the adsorption capacity and temperature. The hysteresis loop of that after the high-temperature and high-pressure isothermal adsorption test is smaller than that of raw coal, and the connectivity of pores becomes worse. In the process of the mercury injection experiment, the hysteresis loop of coking coal after the high-temperature and high-pressure adsorption experiment is smaller than that of raw coal. This demonstrates that the open pores decrease and the semi-closed pores increase, and then the connectivity of the pores becomes worse, which is not conducive to the gas flow when the coking is subjected to high-temperature and high-pressure action. After the high-temperature and high-pressure adsorption experiment, the volume of macropores, visible pores, and crannies of the coking coal decreases, and the volume of micropores and minipores increases. However, the total pore volume reduced overall. Under the same pressure, with the increase in temperature, the volume of macropores, visible pores, and crannies increases, while the volume of micropores and minipores decreases, and the total pore volume increases. After the high-temperature and high-pressure adsorption experiment, the proportion of micropores and minipores increases, and the specific surface area also increases. Under the same pressure, the surface areas of micropores and minipores decrease and the total specific surface area also decreases with the increase in temperature. |
| first_indexed | 2024-04-14T05:46:44Z |
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| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-14T05:46:44Z |
| publishDate | 2022-04-01 |
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| spelling | doaj.art-736f07d8989a45678147431e8befd21d2022-12-22T02:09:16ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-04-011010.3389/feart.2022.877462877462Study on the Pore Structures and Adsorption Characteristics of Coking Coal of Liulin Mining in China Under the Condition of High Temperature and High PressureQi Lingling0Qi Lingling1Qi Lingling2Qi Lingling3Peng Xinshan4Wang Zhaofeng5Wang Zhaofeng6Wang Zhaofeng7Wang Zhaofeng8Chen Xiangjun9Chen Xiangjun10Chen Xiangjun11Chen Xiangjun12Dai Juhua13School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, ChinaMOE Engineering Research Center of Coal Mine Disaster Prevention and Emergency Rescue, Jiaozuo, ChinaCollaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo, ChinaState Key Laboratory Cultivation Base for Gas Geology and Gas Control, Jiaozuo, ChinaSchool of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, ChinaSchool of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, ChinaMOE Engineering Research Center of Coal Mine Disaster Prevention and Emergency Rescue, Jiaozuo, ChinaCollaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo, ChinaState Key Laboratory Cultivation Base for Gas Geology and Gas Control, Jiaozuo, ChinaSchool of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, ChinaMOE Engineering Research Center of Coal Mine Disaster Prevention and Emergency Rescue, Jiaozuo, ChinaCollaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Jiaozuo, ChinaState Key Laboratory Cultivation Base for Gas Geology and Gas Control, Jiaozuo, ChinaSchool of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, ChinaIn order to study the change of pore structure and adsorption characteristics of coking coal after the high-temperature and high-pressure adsorption test, the coking coal from the Liulin coalmine was selected for the research. Both the mercury injection experiments were carried out on the raw coal and the coal after the isothermal adsorption experiment processing with a pressure of 11 MPa and temperature ranging from 30 to 90°C. The results show that the pressure is beneficial to gas adsorption, while the temperature has a restraining effect on the gas adsorption of coking coal, and there is a good negative exponential relationship between the adsorption capacity and temperature. The hysteresis loop of that after the high-temperature and high-pressure isothermal adsorption test is smaller than that of raw coal, and the connectivity of pores becomes worse. In the process of the mercury injection experiment, the hysteresis loop of coking coal after the high-temperature and high-pressure adsorption experiment is smaller than that of raw coal. This demonstrates that the open pores decrease and the semi-closed pores increase, and then the connectivity of the pores becomes worse, which is not conducive to the gas flow when the coking is subjected to high-temperature and high-pressure action. After the high-temperature and high-pressure adsorption experiment, the volume of macropores, visible pores, and crannies of the coking coal decreases, and the volume of micropores and minipores increases. However, the total pore volume reduced overall. Under the same pressure, with the increase in temperature, the volume of macropores, visible pores, and crannies increases, while the volume of micropores and minipores decreases, and the total pore volume increases. After the high-temperature and high-pressure adsorption experiment, the proportion of micropores and minipores increases, and the specific surface area also increases. Under the same pressure, the surface areas of micropores and minipores decrease and the total specific surface area also decreases with the increase in temperature.https://www.frontiersin.org/articles/10.3389/feart.2022.877462/fullhigh temperature and high pressurepore structureadsorption characteristicscoking coaldeep mining area |
| spellingShingle | Qi Lingling Qi Lingling Qi Lingling Qi Lingling Peng Xinshan Wang Zhaofeng Wang Zhaofeng Wang Zhaofeng Wang Zhaofeng Chen Xiangjun Chen Xiangjun Chen Xiangjun Chen Xiangjun Dai Juhua Study on the Pore Structures and Adsorption Characteristics of Coking Coal of Liulin Mining in China Under the Condition of High Temperature and High Pressure Frontiers in Earth Science high temperature and high pressure pore structure adsorption characteristics coking coal deep mining area |
| title | Study on the Pore Structures and Adsorption Characteristics of Coking Coal of Liulin Mining in China Under the Condition of High Temperature and High Pressure |
| title_full | Study on the Pore Structures and Adsorption Characteristics of Coking Coal of Liulin Mining in China Under the Condition of High Temperature and High Pressure |
| title_fullStr | Study on the Pore Structures and Adsorption Characteristics of Coking Coal of Liulin Mining in China Under the Condition of High Temperature and High Pressure |
| title_full_unstemmed | Study on the Pore Structures and Adsorption Characteristics of Coking Coal of Liulin Mining in China Under the Condition of High Temperature and High Pressure |
| title_short | Study on the Pore Structures and Adsorption Characteristics of Coking Coal of Liulin Mining in China Under the Condition of High Temperature and High Pressure |
| title_sort | study on the pore structures and adsorption characteristics of coking coal of liulin mining in china under the condition of high temperature and high pressure |
| topic | high temperature and high pressure pore structure adsorption characteristics coking coal deep mining area |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.877462/full |
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