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Study on the Applicability of Autothermic Pyrolysis In Situ Conversion Process for Low-Grade Oil Shale: A Case Study of Tongchuan, Ordos Basin, China

Author

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  • Dazhong Ren

    (State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China
    State Center for Research and Development of Oil Shale Exploitation, Beijing 100083, China
    Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs, Xi’an Shiyou University, Xi’an 710065, China)

  • Zhendong Wang

    (Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs, Xi’an Shiyou University, Xi’an 710065, China
    School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Fu Yang

    (Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs, Xi’an Shiyou University, Xi’an 710065, China
    School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China)

  • Hao Zeng

    (State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China
    State Center for Research and Development of Oil Shale Exploitation, Beijing 100083, China)

  • Chenyuan Lü

    (State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China
    State Center for Research and Development of Oil Shale Exploitation, Beijing 100083, China)

  • Han Wang

    (College of Construction Engineering, Jilin University, Changchun 130021, China)

  • Senhao Wang

    (School of Engineering and Technology, China University of Geosciences, Beijing 100083, China)

  • Shaotao Xu

    (School of Engineering and Technology, China University of Geosciences, Beijing 100083, China)

Abstract

The feasibility of the autothermic pyrolysis in situ conversion (ATS) process for low-grade oil shale (OS) has not been determined. In this research, the pyrolysis and combustion properties of Tongchuan OS, with a 4.04% oil yield, were systematically analyzed. The findings revealed that temperatures between 350 and 425 °C favored oil production, while temperatures from 450 to 520 °C resulted in a higher rate of gaseous generation. At 300 °C, the volume expansion and ignition coking caused by the large amount of bitumen generated resulted in severe pore plugging, which significantly increased the combustion activation energy of the residue, while the presence of substantial flammable bitumen also significantly decreased the ignition and combustion temperatures. From 300 to 520 °C, the combustion performance of residue decreases continuously. In addition, pyrolysis residues of Tongchuan exhibited a slightly higher calorific value, between 425 and 520 °C, owing to its higher fixed carbon content (10.79%). Based on the ideal temperature screening method outlined for Tongchuan OS, the recommended preheating temperature for Tongchuan OS was 425 °C, while the optimum temperature for the retorting zone should be 510 °C, considering a heat utilization rate of 40%. These findings contribute valuable insights for the application of the ATS process to low-grade OS.

Suggested Citation

  • Dazhong Ren & Zhendong Wang & Fu Yang & Hao Zeng & Chenyuan Lü & Han Wang & Senhao Wang & Shaotao Xu, 2024. "Study on the Applicability of Autothermic Pyrolysis In Situ Conversion Process for Low-Grade Oil Shale: A Case Study of Tongchuan, Ordos Basin, China," Energies, MDPI, vol. 17(13), pages 1-21, June.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:13:p:3225-:d:1426569
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    References listed on IDEAS

    as
    1. Kang, Zhiqin & Zhao, Yangsheng & Yang, Dong, 2020. "Review of oil shale in-situ conversion technology," Applied Energy, Elsevier, vol. 269(C).
    2. Guo, Wei & Yang, Qinchuan & Deng, Sunhua & Li, Qiang & Sun, Youhong & Su, Jianzheng & Zhu, Chaofan, 2022. "Experimental study of the autothermic pyrolysis in-situ conversion process (ATS) for oil shale recovery," Energy, Elsevier, vol. 258(C).
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