IDEAS home Printed from https://ideas.repec.org/a/eee/energy/v334y2025ics0360544225031044.html

Micromechanical response characteristics and control mechanism of SCCO2 injection into the semi-coke layer of tar-rich coal in-situ pyrolysis

Author

Listed:
  • Yang, Xiaolong
  • Shi, Qingmin
  • Wang, Shuangming
  • Cui, Shidong
  • Kou, Bingyang
  • Li, Chunhao

Abstract

Tar-rich coal in-situ pyrolysis (TCIP) can form developed pore-fissure structure spaces to provide an ideal storage vehicle for CO2 geological storage. To investigate the CO2 storage stability, tar-rich coal in-situ pyrolysis semi-coke (simulated burial depth: 1000 m; temperatures: 200 °C, 400 °C, 600 °C) was exposed to the SCCO2-H2O-coal system (12 days/10 MPa/45 °C) in this study. The influence of supercritical CO2 (SCCO2) injection on the micromechanical properties of the in-situ pyrolysis semi-coke layer was analyzed by nanoindentation, X-ray diffraction (XRD), and Raman. The results indicated that the increasing pyrolysis temperature significantly strengthened the micromechanical properties of the in-situ pyrolysis semi-coke layer, but there were variations in the mechanism of SCCO2 on different pyrolysis coal. For 200 °C pyrolysis coal, the extractive removal of low molecular compounds and CO2 adsorption swelling reduced the orderliness of aromatic structures and weakened their micromechanical properties. In contrast, for high-temperature pyrolysis coals with dense and ordered structures (400 °C, 600 °C), the constraint of the rigid skeleton resulted in CO2 adsorption swelling to squeeze the aromatic layer. This process enhanced intermolecular forces and promoted the tight arrangement of macromolecular structures, thereby causing a remarkable elevation in Young's modulus and hardness.

Suggested Citation

  • Yang, Xiaolong & Shi, Qingmin & Wang, Shuangming & Cui, Shidong & Kou, Bingyang & Li, Chunhao, 2025. "Micromechanical response characteristics and control mechanism of SCCO2 injection into the semi-coke layer of tar-rich coal in-situ pyrolysis," Energy, Elsevier, vol. 334(C).
    • Handle: RePEc:eee:energy:v:334:y:2025:i:c:s0360544225031044
    DOI: 10.1016/j.energy.2025.137462
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0360544225031044
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.energy.2025.137462?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to

    for a different version of it.

    References listed on IDEAS

    as
    1. Liu, Ang & Liu, Shimin, 2022. "Mechanical property alterations across coal matrix due to water-CO2 treatments: A micro-to-nano scale experimental study," Energy, Elsevier, vol. 248(C).
    2. Zheng, Yangfeng & Zhai, Cheng & Chen, Aikun & Yu, Xu & Xu, Jizhao & Sun, Yong & Cong, Yuzhou & Tang, Wei & Zhu, Xinyu & Li, Yujie, 2023. "Microstructure evolution of bituminite and anthracite modified by different fracturing fluids," Energy, Elsevier, vol. 263(PB).
    3. Zhang, Xiaogang & Ranjith, P.G. & Ranathunga, A.S., 2019. "Sub- and super-critical carbon dioxide flow variations in large high-rank coal specimen: An experimental study," Energy, Elsevier, vol. 181(C), pages 148-161.
    4. Niu, Qinghe & Cao, Liwen & Sang, Shuxun & Zhou, Xiaozhi & Wang, Zhenzhi & Wu, Zhiyong, 2017. "The adsorption-swelling and permeability characteristics of natural and reconstituted anthracite coals," Energy, Elsevier, vol. 141(C), pages 2206-2217.
    5. Yang, Wei & Wang, Yihan & Yan, Fazhi & Si, Guangyao & Lin, Baiquan, 2022. "Evolution characteristics of coal microstructure and its influence on methane adsorption capacity under high temperature pyrolysis," Energy, Elsevier, vol. 254(PA).
    6. Sonibare, Oluwadayo O. & Haeger, Tobias & Foley, Stephen F., 2010. "Structural characterization of Nigerian coals by X-ray diffraction, Raman and FTIR spectroscopy," Energy, Elsevier, vol. 35(12), pages 5347-5353.
    7. Wang, Fangfang & Wu, Caifang & Zhang, Xiaodong & Gao, Bin, 2024. "Mechanism of SC-CO2 extraction-induced changes to adsorption heat of tectonic coal," Energy, Elsevier, vol. 294(C).
    8. Shi, Qingmin & Cui, Shidong & Wang, Shuangming & Mi, Yichen & Sun, Qiang & Wang, Shengquan & Shi, Chenyu & Yu, Jizhou, 2022. "Experiment study on CO2 adsorption performance of thermal treated coal: Inspiration for CO2 storage after underground coal thermal treatment," Energy, Elsevier, vol. 254(PA).
    9. He, Hengyi & Liu, Peng & Nie, Baisheng & Zhao, Yulong & Wang, Lei & Liu, Xianfeng & Deng, Bozhi & Zhao, Zhengduo & Zhang, Hao & Zhao, Dan & Bao, Song, 2024. "Micromechanical property evolution and damage mechanism of coal subjected to ScCO2 treatment," Energy, Elsevier, vol. 304(C).
    Full references (including those not matched with items on IDEAS)

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Li, Yunzhuo & Ji, Huaijun & Li, Guichuan & Hu, Shaobin & Liu, Xu, 2023. "Effect of supercritical CO2 transient high-pressure fracturing on bituminous coal microstructure," Energy, Elsevier, vol. 282(C).
    2. Wang, Ziwei & Qin, Yong & Shen, Jian & Li, Teng & Zhang, Xiaoyang & Cai, Ying, 2022. "A novel permeability prediction model for coal based on dynamic transformation of pores in multiple scales," Energy, Elsevier, vol. 257(C).
    3. Peng, Zeyu & Zhang, Qian & Liang, Litong & Gao, Zhihua & Wang, Dong & Li, Le & Han, Chun & Jia, Yu & Huang, Wei, 2024. "Evolution of structure and pyrolysis behavior of macerals and their interaction based on macro separation of a sub-bituminous coal," Energy, Elsevier, vol. 312(C).
    4. Gao, Changjing & Liu, Dameng & Vandeginste, Veerle & Cai, Yidong & Sun, Fengrui, 2023. "Thermodynamic energy change and occurrence mechanism of multiple fluids in coal reservoirs," Energy, Elsevier, vol. 283(C).
    5. Zhang, Xiaogang & Jin, Chao & Zhang, Decheng & Zhang, Chengpeng & Ranjith, P.G. & Yuan, Yong, 2023. "Carbon dioxide flow behaviour in macro-scale bituminous coal: An experimental determination of the influence of effective stress," Energy, Elsevier, vol. 268(C).
    6. Lingling Lu & Chen Guo & Zhenlong Chen & Hang Yuan, 2022. "Quantitative Identification of Water Sources of Coalbed Methane Wells, Based on the Hydrogen and Oxygen Isotopes of Produced Water—A Case of the Zhijin Block, South China," Energies, MDPI, vol. 15(24), pages 1-19, December.
    7. Wang, Wendi & Ji, Huaijun & Han, Chu & Liu, Zhen & Hu, Shaobin, 2025. "Micrometer-scale structural alterations and mesoscopic damage mechanisms in coal induced by SC-CO2 impact," Energy, Elsevier, vol. 329(C).
    8. Niu, Dong & Liang, Weiguo & Yan, Jiwei & Yao, Hongbo, 2025. "Study on the transportation and permeability characteristics of mixed-phase CO2 at different temperatures in deep coal seams," Energy, Elsevier, vol. 335(C).
    9. Fan, Yuqiang & Guan, Jun & He, Demin & Hong, Yu & Zhang, Qiumin, 2023. "The influence of inherent minerals on the constant-current electrolysis process of coal-water slurry," Energy, Elsevier, vol. 285(C).
    10. Zhao, Jingyu & Deng, Jun & Wang, Tao & Song, Jiajia & Zhang, Yanni & Shu, Chi-Min & Zeng, Qiang, 2019. "Assessing the effectiveness of a high-temperature-programmed experimental system for simulating the spontaneous combustion properties of bituminous coal through thermokinetic analysis of four oxidation stages," Energy, Elsevier, vol. 169(C), pages 587-596.
    11. Zhang, Chao & Zhao, Yangsheng & Feng, Zijun & Wang, Lei & Meng, Qiaorong & Lu, Yang & Gao, Qiang, 2023. "Comparative study on the chemical structure characteristics of lump coal during superheated water vapor pyrolysis and conventional pyrolysis," Energy, Elsevier, vol. 276(C).
    12. Huping Wang & Zhao Wang & Haikui Yin & Chao Jin & Xiaogang Zhang & Langtao Liu, 2023. "CO 2 Flow Characteristics in Macro-Scale Coal Sample: Effect of CO 2 Injection Pressure and Buried Depth," Sustainability, MDPI, vol. 15(10), pages 1-20, May.
    13. He, Jun & Wang, Bohao & Lu, Zhongliang, 2023. "Experimental study on the effect of magma intrusion and temperature on the pore structure of coal," Energy, Elsevier, vol. 284(C).
    14. Gu, Suqian & Xu, Zhiqiang & Ren, Yangguang & Tu, Yanan & Sun, Meijie & Liu, Xiangyang, 2021. "An approach for upgrading lignite to improve slurryability: Blending with direct coal liquefaction residue under microwave-assisted pyrolysis," Energy, Elsevier, vol. 222(C).
    15. Wendi Sun & Li Bai & Mingshu Chi & Xiuling Xu & Zhao Chen & Kecheng Yu, 2023. "Study on the Evolution Pattern of the Aromatics of Lignin during Hydrothermal Carbonization," Energies, MDPI, vol. 16(3), pages 1-14, January.
    16. Niu, Qinghe & Hu, Mingwei & Chang, Jiangfang & Wang, Wei & Yuan, Wei & Wang, Qizhi & Zheng, Yongxiang & Shang, Songhua, 2024. "Explosive fracturing mechanism in low-permeability sandstone-type uranium deposits considering different acidification reactions," Energy, Elsevier, vol. 312(C).
    17. Zhang, Wenda & Sun, Shaozeng & Zhao, Yijun & Zhao, Zujie & Wang, Pengxiang & Feng, Dongdong & Li, Pengfei, 2020. "Effects of total pressure and CO2 partial pressure on the physicochemical properties and reactivity of pressurized coal char produced at rapid heating rate," Energy, Elsevier, vol. 208(C).
    18. Huang, Haiping & Wang, Eric, 2020. "A laboratory investigation of the impact of solvent treatment on the permeability of bituminous coal from Western Canada with a focus on microbial in-situ processing of coals," Energy, Elsevier, vol. 210(C).
    19. Abunowara, Mustafa & Sufian, Suriati & Bustam, Mohamad Azmi & Eldemerdash, Usama & Suleman, Humbul & Bencini, Roberto & Assiri, Mohammed Ali & Ullah, Sami & Al-Sehemi, Abdullah G., 2020. "Experimental measurements of carbon dioxide, methane and nitrogen high-pressure adsorption properties onto Malaysian coals under various conditions," Energy, Elsevier, vol. 210(C).
    20. Zhang, Lu & Li, Yuan & Zhou, Hongcang, 2018. "Preparation and characterization of DBU-loaded MCM-41 for adsorption of CO2," Energy, Elsevier, vol. 149(C), pages 414-423.

    More about this item

    Keywords

    ;
    ;
    ;
    ;

    JEL classification:

    Statistics

    Access and download statistics

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:energy:v:334:y:2025:i:c:s0360544225031044. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: http://www.journals.elsevier.com/energy .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.