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Combined fluidized bed retorting and circulating fluidized bed combustion system of oil shale: 3. Exergy analysis

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  • Mu, Mao
  • Han, Xiangxin
  • Jiang, Xiumin

Abstract

Exergy analysis as well as energy analysis is applied to Chinese comprehensive utilization system, in which oil shale is firstly introduced to fluidized bed (FB) retort for obtaining oil and resulting semicoke is fed to circulating fluidized bed (CFB) reactor for further utilization. During the calculation, linear programming helps optimize the efficiency of FB retort in the system. In the light of the results, the process flow diagram of the whole system is redrawn. Also, this paper discusses how three operating parameters (the retorting temperature, the mass of burned fuel gas and the temperature of circulating ash) influence the system, especially exergy efficiency. With the retorting temperature increasing, the exergy efficiency first increase and then decrease, and the highest exergy efficiency is in the temperature range 460–490 °C. Compared with retorting temperature, the mass of burned fuel gas and circulating ash temperature have less effect on the exergy efficiency of the whole system. But it is a good strategy for stable operation of the system to burn more fuel gas to provide more energy and exergy to FB retorting unit. This work could give further detailed suggestions and more reference data to operate the system stably and efficiently.

Suggested Citation

  • Mu, Mao & Han, Xiangxin & Jiang, Xiumin, 2018. "Combined fluidized bed retorting and circulating fluidized bed combustion system of oil shale: 3. Exergy analysis," Energy, Elsevier, vol. 151(C), pages 930-939.
    • Handle: RePEc:eee:energy:v:151:y:2018:i:c:p:930-939
    DOI: 10.1016/j.energy.2018.03.100
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    References listed on IDEAS

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    1. Han, Xiangxin & Niu, Mengting & Jiang, Xiumin, 2014. "Combined fluidized bed retorting and circulating fluidized bed combustion system of oil shale: 2. Energy and economic analysis," Energy, Elsevier, vol. 74(C), pages 788-794.
    2. Yang, Qingchun & Qian, Yu & Kraslawski, Andrzej & Zhou, Huairong & Yang, Siyu, 2016. "Advanced exergy analysis of an oil shale retorting process," Applied Energy, Elsevier, vol. 165(C), pages 405-415.
    3. Yang, Qingchun & Qian, Yu & Kraslawski, Andrzej & Zhou, Huairong & Yang, Siyu, 2016. "Framework for advanced exergoeconomic performance analysis and optimization of an oil shale retorting process," Energy, Elsevier, vol. 109(C), pages 62-76.
    4. 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:

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    2. Wei Guo & Zhendong Wang & Youhong Sun & Xiaoshu Lü & Yuan Wang & Sunhua Deng & Qiang Li, 2020. "Effects of Packer Locations on Downhole Electric Heater Performance: Experimental Test and Economic Analysis," Energies, MDPI, vol. 13(2), pages 1-17, January.

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