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Exergy and coupled system analysis of hydrophilic polymeric membrane condenser in coal-fired power plants

Author

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  • Xiao, Liehui
  • Ning, Zhuo
  • Chen, Bin
  • Chen, Jie-Chao
  • Yuan, Wu-Zhi
  • Huang, Si-Min

Abstract

Hydrophilic polymeric membrane condenser (HPMC) is an efficient equipment for the recovery of heat and humidity from flue gas. The previous studies have primarily focused on the performances of water and heat recovery. However, the research on recovered heat grade and irreversible loss of HPMC remains limited. Moreover, the heat utilization of HPMC's outlet water also deserves considerable attention. Therefore, this study conducts a numerical investigation to explore the exergy performance of HPMC, and a novel system that integrates HPMC with absorption heat pump is proposed. The exergy efficiency increases from 16 % to 48 % in HPMC along the water flow direction, attributed to a decrease in exergy destruction. The elevation of flue gas temperature exhibits a notable enhancement in the recovered exergy flux, while concurrently intensifying the exergy destruction. The optimal cooling water temperature and flow rate are 28 °C and 1.8 t/h, respectively, to attain the maximum recovered exergy flux. The novel system demonstrates exceptional efficiency in heat and humidity recovery, as well as exergy performance. The payback period of the novel system is 1.33 years with operating duration of 5500 h/year. This study offers a new perspective on the exergy performance and heat utilization of HPMC.

Suggested Citation

  • Xiao, Liehui & Ning, Zhuo & Chen, Bin & Chen, Jie-Chao & Yuan, Wu-Zhi & Huang, Si-Min, 2025. "Exergy and coupled system analysis of hydrophilic polymeric membrane condenser in coal-fired power plants," Energy, Elsevier, vol. 314(C).
    • Handle: RePEc:eee:energy:v:314:y:2025:i:c:s0360544224039227
    DOI: 10.1016/j.energy.2024.134144
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