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Optimization of temperature parameters for the autothermic pyrolysis in-situ conversion process of oil shale

Author

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  • Xu, Shaotao
  • Lü, Xiaoshu
  • Sun, Youhong
  • Guo, Wei
  • Li, Qiang
  • Liu, Lang
  • Kang, Shijie
  • Deng, Sunhua

Abstract

In this study, a temperature optimization strategy for the Huadian oil shale autothermal pyrolysis in-situ conversion process (ATS) was first proposed by systematically investigating the reaction characteristics of various semi-cokes. As the pyrolysis temperature rised, the semi-coke's calorific value was found to undergo three different stages of increasing, decreasing, and flattening, peaking at around 330 °C. Additionally, the semi-cokes formed at different temperatures exhibited similar combustion characteristics, including combustion activation energy, combustion characteristic parameters, and product release characteristics. Due to the serious pore blockage caused by the substantial generation and the ignition coking of the bitumen, the reaction characteristics of semi-cokes were dramatically decreased at about 330 °C. Finally, the relationship between in-situ heat generation and demand at various stages of ATS process was discussed, and a reasonable strategy for the screening of temperature parameters was proposed. According to this strategy, the optimal control temperature for the preheating stage was determined at 350–370 °C and at Tact (defined in 4.3.2) for the retorting zone in the reaction stage. The results of this study provide a new perspective on the theoretical foundation of the ATS process and have crucial guiding implications for practical engineering applications.

Suggested Citation

  • Xu, Shaotao & Lü, Xiaoshu & Sun, Youhong & Guo, Wei & Li, Qiang & Liu, Lang & Kang, Shijie & Deng, Sunhua, 2023. "Optimization of temperature parameters for the autothermic pyrolysis in-situ conversion process of oil shale," Energy, Elsevier, vol. 264(C).
    • Handle: RePEc:eee:energy:v:264:y:2023:i:c:s0360544222031954
    DOI: 10.1016/j.energy.2022.126309
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    References listed on IDEAS

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    1. Zhan, Honglei & Qin, Fankai & Chen, Sitong & Chen, Ru & Meng, Zhaohui & Miao, Xinyang & Zhao, Kun, 2022. "Two-step pyrolysis degradation mechanism of oil shale through comprehensive analysis of pyrolysis semi-cokes and pyrolytic gases," Energy, Elsevier, vol. 241(C).
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    Cited by:

    1. Shangli Liu & Haifeng Gai & Peng Cheng, 2023. "Technical Scheme and Application Prospects of Oil Shale In Situ Conversion: A Review of Current Status," Energies, MDPI, vol. 16(11), pages 1-22, May.
    2. Xu, Shaotao & Sun, Youhong & Yang, Qinchuan & Wang, Han & Kang, Shijie & Guo, Wei & Shan, Xuanlong & He, Wentong, 2023. "Product migration and regional reaction characteristics in the autothermic pyrolysis in-situ conversion process of low-permeability Huadian oil shale core," Energy, Elsevier, vol. 283(C).
    3. Zhang, Xu & Guo, Wei & Pan, Junfan & Zhu, Chaofan & Deng, Sunhua, 2024. "In-situ pyrolysis of oil shale in pressured semi-closed system: Insights into products characteristics and pyrolysis mechanism," Energy, Elsevier, vol. 286(C).
    4. Wang, Yanwen & Han, Xiangxin & Jiang, Xiumin, 2023. "Exploring pyrolysis of the aromatics in shale oil by experimental study and kinetic modelling," Energy, Elsevier, vol. 279(C).

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