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Energy, exergy and economic benefits deriving from LNG-fired power plant: Cold energy power generation combined with carbon dioxide capture

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  • Ouyang, Tiancheng
  • Tan, Jiaqi
  • Wu, Wencong
  • Xie, Shutao
  • Li, Difan

Abstract

According to The Paris Agreement, countries need to strictly control carbon emissions before global warming causes great damage to the environment. Therefore, how to reduce carbon emissions to restore carbon neutrality has become an inevitable life-and-death matter for all countries from a long-term perspective. In view of the ever-increasing LNG-fired power plants and the wasted LNG cold energy in vaporization process, a new environment-friendly cold energy utilization method is proposed to meet energy conservation and pollution reduction targets in this paper, integrating the organic Rankine cycle and the carbon dioxide capture cycle. Moreover, a full and deliberate comparison of pure and binary fluids is made to determine the optimal fluids of organic Rankine cycle (R600a) and carbon dioxide capture cycle (NH3+R125), respectively. After being optimized by genetic algorithm, the thermal efficiency is 33.7% and exergy efficiency reaches 47.2%. Meanwhile, the net specific work and total carbon dioxide capture generated by the system are 110.1 kWh/tLNG and 0.78 t/tLNG. In terms of economic benefit, this cold energy utilization system can recover the total investment cost in 1.85 years. Thus, the practical application of this proposed method is completely feasible and economical, and it can recover capital in a short time.

Suggested Citation

  • Ouyang, Tiancheng & Tan, Jiaqi & Wu, Wencong & Xie, Shutao & Li, Difan, 2022. "Energy, exergy and economic benefits deriving from LNG-fired power plant: Cold energy power generation combined with carbon dioxide capture," Renewable Energy, Elsevier, vol. 195(C), pages 214-229.
    • Handle: RePEc:eee:renene:v:195:y:2022:i:c:p:214-229
    DOI: 10.1016/j.renene.2022.06.033
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