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Thermodynamic analysis of a solar thermochemical cycle-based direct coal liquefaction system for oil production

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  • Kong, Hui
  • Kong, Xianghui
  • Wang, Jian
  • Zhang, Jun

Abstract

Two-step thermochemical cycling based on metal oxide is a promising means of harvesting solar energy, in which hydrogen could be obtained through water splitting via the reduction and oxidation reactions driven by concentrated solar heat. A new kind of solar thermochemical cycle-based direct coal liquefaction system for oil production is proposed and analyzed in this paper. The coal gasification part of the traditional coal liquefaction system for hydrogen generation is replaced by thermochemical cycling process. In addition, fuel coal consumption in the coal-fired boiler for the steam generation of the traditional direct coal liquefaction system could be reduced through the heat recovery of gas mixture or oxygen carrier of the thermochemical cycle. To reveal the characteristics of the new system, the reduction of pollutant emissions, energy efficiency and relative coal saving ratio are used as the key parameters. A large amount of SO2, NOx and CO2 in this coupling system could be reduced as the coal-fired boiler part for steam generation is replaced by the heat recovery from solar thermochemical cycling. The new proposed system is optimized with the reduction temperature and different gas or solid heat recovery rate allocation of the thermochemical cycles, in order to improve the energy efficiency and simplify the system device. Solar-to-hydrogen efficiency of the two-step thermochemical cycle part could be improved by proper heat recovery and extra pure oxygen will be obtained by the reduction reaction of the thermochemical cycling part. The theoretical energy efficiency of ∼47% and the relative coal saving ratio of ∼42.6% for the proposed system (the reduction and oxidation temperatures are 1500 °C and 821 °C with 70% solid heat recovery rate from oxygen carrier for water splitting) may indicate a meaningful route for oil production by direct coal liquefaction.

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  • Kong, Hui & Kong, Xianghui & Wang, Jian & Zhang, Jun, 2019. "Thermodynamic analysis of a solar thermochemical cycle-based direct coal liquefaction system for oil production," Energy, Elsevier, vol. 179(C), pages 1279-1287.
    • Handle: RePEc:eee:energy:v:179:y:2019:i:c:p:1279-1287
    DOI: 10.1016/j.energy.2019.05.019
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    References listed on IDEAS

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    Cited by:

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    3. Yadav, Deepak & Banerjee, Rangan, 2022. "Thermodynamic and economic analysis of the solar carbothermal and hydrometallurgy routes for zinc production," Energy, Elsevier, vol. 247(C).
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    5. Jie, Dingfei & Xu, Xiangyang & Guo, Fei, 2021. "The future of coal supply in China based on non-fossil energy development and carbon price strategies," Energy, Elsevier, vol. 220(C).
    6. Kong, Hui & Wang, Jian & Zheng, Hongfei & Wang, Hongsheng & Zhang, Jun & Yu, Zhufeng & Bo, Zheng, 2022. "Techno-economic analysis of a solar thermochemical cycle-based direct coal liquefaction system for low-carbon oil production," Energy, Elsevier, vol. 239(PC).
    7. Zhang, Yueling & Li, Junjie & Yang, Xiaoxiao, 2021. "Comprehensive competitiveness assessment of four coal-to-liquid routes and conventional oil refining route in China," Energy, Elsevier, vol. 235(C).
    8. Kong, Hui & Li, Zheng & Yu, Zhufeng & Zhang, Jun & Wang, Hongsheng & Wang, Jian & Gao, Dan, 2021. "Environmental and economic multi-objective optimization of comprehensive energy industry: A case study," Energy, Elsevier, vol. 237(C).
    9. Liu, Rongtang & Liu, Ming & Zhao, Yongliang & Ma, Yuegeng & Yan, Junjie, 2021. "Thermodynamic study of a novel lignite poly-generation system driven by solar energy," Energy, Elsevier, vol. 214(C).

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