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Numerical Simulation of Oil Shale Pyrolysis under Microwave Irradiation Based on a Three-Dimensional Porous Medium Multiphysics Field Model

Author

Listed:
  • Hao Wang

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Xiaogang Li

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Jingyi Zhu

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China
    College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China)

  • Zhaozhong Yang

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Jie Zhou

    (Institute of Applied Electromagnetics, Sichuan University, Chengdu 610064, China)

  • Liangping Yi

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

Abstract

The pyrolysis characteristics of oil shale during heat treatment dominate the oil production of kerogen. In this study, the pyrolysis characteristics of oil shale in a laboratory microwave apparatus were investigated based on a novel fully coupled three-dimensional electromagnetic-thermal-chemical-hydraulic model according to the experimental microwave apparatus. By simulating the electric field, temperature distribution, and kerogen decomposition within oil shale subjected to microwave irradiation, several parameters, including waveguide, position, and power, were successfully optimized. The results indicated that the non-uniform temperature distribution was consistent with the distribution of the electric field. Double microwave ports were more effective than single ports in terms of heating rate and temperature uniformity. There was an optimal location where the highest heating efficiency was obtained, which was on the left of the cavity center. When irradiation was conducted over a range of microwave powers, a higher power was suitable for achieving a rapid temperature increase, whereas a lower power was suitable to gain a high efficiency of the pyrolysis rate. Therefore, a variable power heating mode was introduced to decrease the heating time and improve the heat uniformity simultaneously during oil shale pyrolysis. Specifically, the secondary reactions of oil products should be maximally avoided by controlling the microwave power.

Suggested Citation

  • Hao Wang & Xiaogang Li & Jingyi Zhu & Zhaozhong Yang & Jie Zhou & Liangping Yi, 2022. "Numerical Simulation of Oil Shale Pyrolysis under Microwave Irradiation Based on a Three-Dimensional Porous Medium Multiphysics Field Model," Energies, MDPI, vol. 15(9), pages 1-20, April.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:9:p:3256-:d:805200
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    References listed on IDEAS

    as
    1. Fuke Dong & Zijun Feng & Dong Yang & Yangsheng Zhao & Derek Elsworth, 2018. "Permeability Evolution of Pyrolytically-Fractured Oil Shale under In Situ Conditions," Energies, MDPI, vol. 11(11), pages 1-9, November.
    2. Song, Xianzhi & Zhang, Chengkai & Shi, Yu & Li, Gensheng, 2019. "Production performance of oil shale in-situ conversion with multilateral wells," Energy, Elsevier, vol. 189(C).
    3. Jia Liu & Jianguo Wang & Chunfai Leung & Feng Gao, 2018. "A Fully Coupled Numerical Model for Microwave Heating Enhanced Shale Gas Recovery," Energies, MDPI, vol. 11(6), pages 1-28, June.
    4. Wang, Guoying & Liu, Shaowei & Yang, Dong & Fu, Mengxiong, 2022. "Numerical study on the in-situ pyrolysis process of steeply dipping oil shale deposits by injecting superheated water steam: A case study on Jimsar oil shale in Xinjiang, China," Energy, Elsevier, vol. 239(PC).
    5. Hongyuan Qi & Huayi Jiang & Yanzhen You & Juan Hu & Yulong Wang & Zhe Wu & Hongxin Qi, 2022. "Mechanism of Magnetic Nanoparticle Enhanced Microwave Pyrolysis for Oily Sludge," Energies, MDPI, vol. 15(4), pages 1-22, February.
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