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Regulating the oxidative assisted pyrolysis of Huadian oil shale by preheating temperature and oxygen flow rate

Author

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  • Xu, Shaotao
  • Sun, Youhong
  • Guo, Wei
  • Yang, Qinchuan
  • Li, Qiang
  • Guo, Mingyi
  • Bai, Fengtian
  • Zhu, Chaofan
  • Deng, Sunhua

Abstract

The effects of preheating temperature and oxygen flow rate on the reaction behaviour and product yields and characteristics after the oxidative assisted pyrolysis (OP) of Huadian oil shale were systematically investigated in this paper. The results show two marked temperature boundaries in the OP reaction process, namely, the initiation temperature and the ignition temperature. First, an obvious initiation process could be found when the oil shale was preheated above a relatively lower temperature of 190 °C, which was considered to be the first boundary temperature of OP. Actually, the initiation was caused by the self-heating effect which could effectively enhance the pyrolysis of kerogen. Moreover, the self-heating effect could be strengthened by increasing the oxygen flow rate. However, an excessively high preheating temperature or oxygen flow rate may result in excessively high internal temperatures, which could exceed the ignition temperature of some organics, that is, the second boundary temperature of OP. Furthermore, the self-heating effect could improve the contents of heavy components, asphaltenes, and resins in the shale oil products at a suitable preheating temperature. Finally, a mechanism whereby the preheating temperature and oxygen flow rate influence the OP behaviour of oil shale was proposed.

Suggested Citation

  • Xu, Shaotao & Sun, Youhong & Guo, Wei & Yang, Qinchuan & Li, Qiang & Guo, Mingyi & Bai, Fengtian & Zhu, Chaofan & Deng, Sunhua, 2023. "Regulating the oxidative assisted pyrolysis of Huadian oil shale by preheating temperature and oxygen flow rate," Energy, Elsevier, vol. 262(PB).
    • Handle: RePEc:eee:energy:v:262:y:2023:i:pb:s0360544222024884
    DOI: 10.1016/j.energy.2022.125602
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    References listed on IDEAS

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    1. Huang, Lijuan & Wang, Yu & Li, Zongfa & Zhang, Liang & Yin, Yuchuan & Chen, Chao & Ren, Shaoran, 2021. "Experimental study on piloted ignition temperature and auto ignition temperature of heavy oils at high pressure," Energy, Elsevier, vol. 229(C).
    2. Niu, Mengting & Wang, Sha & Han, Xiangxin & Jiang, Xiumin, 2013. "Yield and characteristics of shale oil from the retorting of oil shale and fine oil-shale ash mixtures," Applied Energy, Elsevier, vol. 111(C), pages 234-239.
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    Cited by:

    1. Nie, Bin, 2023. "Study on thermal decomposition of oil shale: Two-phase fluid simulation in wellbore," Energy, Elsevier, vol. 272(C).
    2. Wei, Jianguang & Yang, Erlong & Li, Jiangtao & Liang, Shuang & Zhou, Xiaofeng, 2023. "Nuclear magnetic resonance study on the evolution of oil water distribution in multistage pore networks of shale oil reservoirs," Energy, Elsevier, vol. 282(C).
    3. 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).
    4. Huang, Xudong & Kang, Zhiqin & Zhao, Jing & Wang, Guoying & Zhang, Hongge & Yang, Dong, 2023. "Experimental investigation on micro-fracture evolution and fracture permeability of oil shale heated by water vapor," Energy, Elsevier, vol. 277(C).

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