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Experimental Study on the Factors of the Oil Shale Thermal Breakdown in High-Voltage Power Frequency Electric Heating Technology

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  • Youhong Sun

    (Construction Engineering College, Jilin University, Changchun 130026, China
    National-Local Joint Engineering Laboratory of In-Situ Conversion, Drilling and Exploitation Technology for Oil Shale, Changchun 130021, China
    Key Laboratory of Drilling and Exploitation Technology in Complex Condition, Ministry of Land and Resource, Changchun 130026, China
    School of Engineering and Technology, China University of Geosciences, Beijing 100083, China)

  • Shichang Liu

    (Construction Engineering College, Jilin University, Changchun 130026, China
    National-Local Joint Engineering Laboratory of In-Situ Conversion, Drilling and Exploitation Technology for Oil Shale, Changchun 130021, China
    Key Laboratory of Drilling and Exploitation Technology in Complex Condition, Ministry of Land and Resource, Changchun 130026, China)

  • Qiang Li

    (Construction Engineering College, Jilin University, Changchun 130026, China
    National-Local Joint Engineering Laboratory of In-Situ Conversion, Drilling and Exploitation Technology for Oil Shale, Changchun 130021, China
    Key Laboratory of Drilling and Exploitation Technology in Complex Condition, Ministry of Land and Resource, Changchun 130026, China)

  • Xiaoshu Lü

    (Construction Engineering College, Jilin University, Changchun 130026, China
    National-Local Joint Engineering Laboratory of In-Situ Conversion, Drilling and Exploitation Technology for Oil Shale, Changchun 130021, China
    Key Laboratory of Drilling and Exploitation Technology in Complex Condition, Ministry of Land and Resource, Changchun 130026, China
    Department of Electrical Engineering and Energy Technology, University of Vaasa, P.O. Box 700, FIN-65101 Vaasa, Finland)

Abstract

We conducted an experimental study on the breakdown process of oil shale by high-voltage power frequency electric heating in-situ pyrolyzing (HVF) technology to examine the impact mechanisms of the electric field intensity, initial temperature, and moisture content on a breakdown, using Huadian oil shale samples. A thermal breakdown occurred when the electric field intensity was between 100 and 180 V/cm. The greater the electric field intensity, the easier the thermal breakdown and the lower the energy consumption. The critical temperature of the oil shale thermal breakdown ranged from 93 to 102 °C. A higher initial temperature increases the difficulty of breakdown, which is inconsistent with the classical theory of a solid thermal breakdown. The main factor that affects the electrical conductivity of oil shale is the presence of water, which is also a necessary condition for the thermal breakdown of oil shale. There should be an optimal moisture content that minimizes both the breakdown time and energy consumption for oil shale’s thermal breakdown. The thermal breakdown of oil shale results from heat generation and dissipation. The electric field intensity only affects the heat generation process, whereas the initial temperature and moisture content impact both the heat generation and dissipation processes, and the impacts of moisture content are greater than those of the initial temperature.

Suggested Citation

  • Youhong Sun & Shichang Liu & Qiang Li & Xiaoshu Lü, 2022. "Experimental Study on the Factors of the Oil Shale Thermal Breakdown in High-Voltage Power Frequency Electric Heating Technology," Energies, MDPI, vol. 15(19), pages 1-12, September.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:19:p:7181-:d:929134
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    References listed on IDEAS

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    1. Kang, Zhiqin & Zhao, Yangsheng & Yang, Dong, 2020. "Review of oil shale in-situ conversion technology," Applied Energy, Elsevier, vol. 269(C).
    2. Xudong Huang & Dong Yang & Zhiqin Kang, 2020. "Study on the Pore and Fracture Connectivity Characteristics of Oil Shale Pyrolyzed by Superheated Steam," Energies, MDPI, vol. 13(21), pages 1-14, November.
    3. Jing Zhang & Feipeng Wang & Jian Li & Hehuan Ran & Xudong Li & Qiang Fu, 2017. "Breakdown Voltage and Its Influencing Factors of Thermally Aged Oil-Impregnated Paper at Pulsating DC Voltage," Energies, MDPI, vol. 10(9), pages 1-16, September.
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