Interactions of dynamic supercritical CO2 fluid with different rank moisture-equilibrated coals: Implications for CO2 sequestration in coal seams

doi:10.1016/j.cjche.2020.10.020

中国化学工程学报 ›› 2021, Vol. 35 ›› Issue (7): 288-301.DOI: 10.1016/j.cjche.2020.10.020

• Resources and Environmental Technology • 上一篇

Interactions of dynamic supercritical CO₂ fluid with different rank moisture-equilibrated coals: Implications for CO₂ sequestration in coal seams

Zichao Hu, Chao Li, Dengfeng Zhang

Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China;State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China

收稿日期:2020-05-07 修回日期:2020-09-14 出版日期:2021-07-28 发布日期:2021-09-30
通讯作者: Dengfeng Zhang
基金资助:
This research is sponsored by the National Natural Science Foundation of China (41762013), the Open Foundation of Key Laboratory of Shale Oil and Gas Exploration & Production, SINOPEC (G5800-19-ZS-KFZY001), and the National Major Project during the 13th Five-Year Plan Period (2016ZX05061).

Interactions of dynamic supercritical CO₂ fluid with different rank moisture-equilibrated coals: Implications for CO₂ sequestration in coal seams

Zichao Hu, Chao Li, Dengfeng Zhang

Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China;State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China

Received:2020-05-07 Revised:2020-09-14 Online:2021-07-28 Published:2021-09-30
Contact: Dengfeng Zhang
Supported by:
This research is sponsored by the National Natural Science Foundation of China (41762013), the Open Foundation of Key Laboratory of Shale Oil and Gas Exploration & Production, SINOPEC (G5800-19-ZS-KFZY001), and the National Major Project during the 13th Five-Year Plan Period (2016ZX05061).

摘要/Abstract

摘要： The interactions between CO₂ and coals during CO₂-ECBM (CO₂ sequestration in deep coal seams with enhanced coal-bed methane recovery) could change pore morphology and chemistry property of coals, thereby affecting adsorption, diffusion and flow capability of CO₂ and CH₄ within coal reservoirs. To simulate CO₂-ECBM process more practically, the dynamic interactions of supercritical CO₂ (scCO₂) and moisture-equilibrated coals were performed at temperature of 318.15 K, pressure of 12.00 MPa, and duration of 12.00 h. The impacts of the interactions on physicochemical properties of coals were investigated. Results indicate that scCO₂/H₂O exposure shows minor effect on micropores of coals. However, the exposure significantly decreases the mesopore surface area of bituminous coals, while increases that of anthracites. The mesopore volume and the average mesopore diameter of all the coals after scCO₂/H₂O exposure decrease. The multi-fractal analysis verifies that the scCO₂ exposure can enhance the pore connectivity of various rank coals. Apart from the pore morphology, the exposure of scCO₂/H₂O also affects the oxygenic functional groups on coal surface. Particularly, the exposure of scCO₂/H₂O reduces the content of CO and CO of coals. The content of COOH of low rank coals including Hehua-M2# coal, Zhongqiang-4# coal, Buliangou-9# coal and Tashan-5# coal decreases, while the high rank Laochang-11# coal and Kaiyuan-9# coal witness a growth in COOH. The content of total oxygenic functional groups of all coals after interaction with scCO₂/H₂O decreases; on the contrary, that of CC/CH of all coals after scCO₂/H₂O exposure increases. In summary, the interaction with scCO₂/H₂O significantly changes the pore system and oxygenic functional groups of various rank coals, which needs further attention regarding CO₂-ECBM.

关键词: Coal, Sequestration, Moisture, Supercritical carbon dioxide, Methane

Abstract: The interactions between CO₂ and coals during CO₂-ECBM (CO₂ sequestration in deep coal seams with enhanced coal-bed methane recovery) could change pore morphology and chemistry property of coals, thereby affecting adsorption, diffusion and flow capability of CO₂ and CH₄ within coal reservoirs. To simulate CO₂-ECBM process more practically, the dynamic interactions of supercritical CO₂ (scCO₂) and moisture-equilibrated coals were performed at temperature of 318.15 K, pressure of 12.00 MPa, and duration of 12.00 h. The impacts of the interactions on physicochemical properties of coals were investigated. Results indicate that scCO₂/H₂O exposure shows minor effect on micropores of coals. However, the exposure significantly decreases the mesopore surface area of bituminous coals, while increases that of anthracites. The mesopore volume and the average mesopore diameter of all the coals after scCO₂/H₂O exposure decrease. The multi-fractal analysis verifies that the scCO₂ exposure can enhance the pore connectivity of various rank coals. Apart from the pore morphology, the exposure of scCO₂/H₂O also affects the oxygenic functional groups on coal surface. Particularly, the exposure of scCO₂/H₂O reduces the content of CO and CO of coals. The content of COOH of low rank coals including Hehua-M2# coal, Zhongqiang-4# coal, Buliangou-9# coal and Tashan-5# coal decreases, while the high rank Laochang-11# coal and Kaiyuan-9# coal witness a growth in COOH. The content of total oxygenic functional groups of all coals after interaction with scCO₂/H₂O decreases; on the contrary, that of CC/CH of all coals after scCO₂/H₂O exposure increases. In summary, the interaction with scCO₂/H₂O significantly changes the pore system and oxygenic functional groups of various rank coals, which needs further attention regarding CO₂-ECBM.

Key words: Coal, Sequestration, Moisture, Supercritical carbon dioxide, Methane

Zichao Hu, Chao Li, Dengfeng Zhang. Interactions of dynamic supercritical CO₂ fluid with different rank moisture-equilibrated coals: Implications for CO₂ sequestration in coal seams[J]. 中国化学工程学报, 2021, 35(7): 288-301.

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Interactions of dynamic supercritical CO₂ fluid with different rank moisture-equilibrated coals: Implications for CO₂ sequestration in coal seams

Interactions of dynamic supercritical CO₂ fluid with different rank moisture-equilibrated coals: Implications for CO₂ sequestration in coal seams

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