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System integration optimization for coal-fired power plant with CO2 capture by Na2CO3 dry sorbents

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  • Wu, Ying
  • Chen, Xiaoping
  • Ma, Jiliang
  • Wu, Ye
  • Liu, Daoyin
  • Xie, Weiyi

Abstract

For the post-combustion CO2 capture by the Na2CO3 dry sorbents, system integration of CO2 capture into an existing coal-fired power plant is of great significance, as the huge energy consumption of CO2 capture results in great efficiency penalty. By system integration optimization, nearly 80% of the low temperature energy released from the CO2 capture could be recovered to gain more power output and provide considerable heat supply for users, yielding a respective 0.6% and 34.13% increment of the net electric efficiency and coal utilization coefficient. Besides, combination with the waste heat recovery of flue gas further increases the net electric efficiency by 0.57%. Both the thermodynamic and exergy analysis results show that the optimization measures provide a promising way for system integration of the coal-fired power plant with CO2 capture. Techno-economic analysis results shows that cost of electricity and cost of CO2 avoided are obviously reduced due to the optimization measures proposed in this paper.

Suggested Citation

  • Wu, Ying & Chen, Xiaoping & Ma, Jiliang & Wu, Ye & Liu, Daoyin & Xie, Weiyi, 2020. "System integration optimization for coal-fired power plant with CO2 capture by Na2CO3 dry sorbents," Energy, Elsevier, vol. 211(C).
    • Handle: RePEc:eee:energy:v:211:y:2020:i:c:s0360544220316625
    DOI: 10.1016/j.energy.2020.118554
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