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Thermodynamic and economic performance of oxy-combustion power plants integrating chemical looping air separation

Author

Listed:
  • Qing, Menglei
  • Jin, Bo
  • Ma, Jinchen
  • Zou, Xixian
  • Wang, Xiaoyu
  • Zheng, Chuguang
  • Zhao, Haibo

Abstract

Oxygen supply from cryogenic air separation unit (ASU) causes high economic cost and energy penalty, which hinders the practicability of oxy-combustion technology. Chemical looping air separation (CLAS) as a thermodynamic-efficient and cost-effective approach can satisfy the oxygen demands for oxy-combustion power plants. To optimize process configuration and identify the effect of recycling position for oxy-combustion power plants integrating CLAS (i.e. OXY-CLAS), the paper focuses on process simulation, thermodynamic analysis and techno-economic evaluation of two typical OXY-CLAS systems. For sastifying the oxygen concentration demand in oxy-combustion, the mixture of recycled flue gas and steam is adopted as the reduction medium in CLAS. For OXY-CCLAS (using cold recycled flue gas as oxygen releasing medium in CLAS), its net efficiency and exergy efficiency are 4.80 and 4.54% points higher than those of oxy-combustion coupled with cryogenic ASU, respectively. Meanwhile, its cost of electricity is reduced about 12.18% whilst its CO2 avoidance cost and CO2 capture cost decrease about 48.14% and 39.34%, respectively. When compared between two OXY-CLAS systems, OXY-WCLAS (utilizing warm recycled flue gas in CLAS) exhibits better performance both on thermodynamic and economic aspects. The exergy efficiency of WCLAS system is 1.29% points higher than that of CCLAS system.

Suggested Citation

  • Qing, Menglei & Jin, Bo & Ma, Jinchen & Zou, Xixian & Wang, Xiaoyu & Zheng, Chuguang & Zhao, Haibo, 2020. "Thermodynamic and economic performance of oxy-combustion power plants integrating chemical looping air separation," Energy, Elsevier, vol. 206(C).
    • Handle: RePEc:eee:energy:v:206:y:2020:i:c:s0360544220312433
    DOI: 10.1016/j.energy.2020.118136
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    References listed on IDEAS

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    1. Cormos, Calin-Cristian, 2020. "Energy and cost efficient manganese chemical looping air separation cycle for decarbonized power generation based on oxy-fuel combustion and gasification," Energy, Elsevier, vol. 191(C).
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    5. Serrano, José Ramón & Arnau, Francisco José & García-Cuevas, Luis Miguel & Gutiérrez, Fabio Alberto, 2022. "Thermo-economic analysis of an oxygen production plant powered by an innovative energy recovery system," Energy, Elsevier, vol. 255(C).

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