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Method of flash evaporation and condensation – heat pump for deep cooling of coal-fired power plant flue gas: Latent heat and water recovery

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Listed:
  • Li, Yuzhong
  • Yan, Min
  • Zhang, Liqiang
  • Chen, Guifang
  • Cui, Lin
  • Song, Zhanlong
  • Chang, Jingcai
  • Ma, Chunyuan

Abstract

Flue gas waste heat recovery and utilization is an efficient means to improve the energy efficiency of coal-fired power plants. At present, the surface corrosion and fouling problems of heat exchanger hinder the development of flue gas deep cooling. In this study, a novel flue gas deep cooling method that can reduce flue gas temperature below the dew point of vapor to recover latent heat and obtain clean water simultaneously is proposed to achieve improved energy efficiency. The heat transfer mode of this method is the direct contact mode, which takes the scrubber, e.g. the flue gas desulfurization (FGD) scrubber, as the deep cooling exchanger. The flash evaporation and condensation (FEC) device and heat pump (HP) are utilized to provide low-temperature medium, such as FGD slurry or water, for washing and deep cooling flue gas, to collect recovered water, and to absorb recovered waste heat. This method is called as the FEC–HP method. This paper elaborated on two optional models of the proposed method. The mechanism for recovering heat and water was also analyzed using the customized flue gas humidity chart, and the method to quantitate recovered heat and water, as well as the results of the case of a 300MW coal-fired generator set were provided. Net present value calculations showed that this method is profitable in the scenario of burning high-water-content coals. Several potential advantages of this method and suggestions for practical application were also discussed.

Suggested Citation

  • Li, Yuzhong & Yan, Min & Zhang, Liqiang & Chen, Guifang & Cui, Lin & Song, Zhanlong & Chang, Jingcai & Ma, Chunyuan, 2016. "Method of flash evaporation and condensation – heat pump for deep cooling of coal-fired power plant flue gas: Latent heat and water recovery," Applied Energy, Elsevier, vol. 172(C), pages 107-117.
    • Handle: RePEc:eee:appene:v:172:y:2016:i:c:p:107-117
    DOI: 10.1016/j.apenergy.2016.03.017
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    8. Zhao, Chunhao & Wang, Zhengfeng & Gao, Dan & Chen, Haiping & Zhang, Heng, 2022. "Simulation and techno-economic analysis of moisture and heat recovery from original flue gas in coal-fired power plants by macroporous ceramic membrane," Energy, Elsevier, vol. 259(C).
    9. Sun, Fangtian & Zhao, Jinzi & Fu, Lin & Sun, Jian & Zhang, Shigang, 2017. "New district heating system based on natural gas-fired boilers with absorption heat exchangers," Energy, Elsevier, vol. 138(C), pages 405-418.
    10. Lin, Xiaolong & Li, Qinlun & Wang, Lukai & Guo, Yifan & Liu, Yinhe, 2020. "Thermo-economic analysis of typical thermal systems and corresponding novel system for a 1000 MW single reheat ultra-supercritical thermal power plant," Energy, Elsevier, vol. 201(C).
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    12. Young-Min Kim & Assmelash Negash & Syed Safeer Mehdi Shamsi & Dong-Gil Shin & Gyubaek Cho, 2021. "Experimental Study of a Lab-Scale Organic Rankine Cycle System for Heat and Water Recovery from Flue Gas in Thermal Power Plants," Energies, MDPI, vol. 14(14), pages 1-13, July.
    13. Shang, Sheng & Li, Xianting & Chen, Wei & Wang, Baolong & Shi, Wenxing, 2017. "A total heat recovery system between the flue gas and oxidizing air of a gas-fired boiler using a non-contact total heat exchanger," Applied Energy, Elsevier, vol. 207(C), pages 613-623.
    14. Wang, Jingyi & Hua, Jing & Fu, Lin & Zhou, Ding, 2020. "Effect of gas nonlinearity on boilers equipped with vapor-pump (BEVP) system for flue-gas heat and moisture recovery," Energy, Elsevier, vol. 198(C).
    15. Zhao, Yulong & Wang, Shixue & Ge, Minghui & Li, Yanzhe & Liang, Zhaojun & Yang, Yurong, 2018. "Performance analysis of a thermoelectric generator applied to wet flue gas waste heat recovery," Applied Energy, Elsevier, vol. 228(C), pages 2080-2089.
    16. Cui, Lin & Song, Xiangda & Li, Yuzhong & Wang, Yang & Feng, Yupeng & Yan, Lifan & Dong, Yong, 2018. "Synergistic capture of fine particles in wet flue gas through cooling and condensation," Applied Energy, Elsevier, vol. 225(C), pages 656-667.
    17. Syed Safeer Mehdi Shamsi & Assmelash A. Negash & Gyu Baek Cho & Young Min Kim, 2019. "Waste Heat and Water Recovery System Optimization for Flue Gas in Thermal Power Plants," Sustainability, MDPI, vol. 11(7), pages 1-20, March.
    18. Wang, Jingyi & Hua, Jing & Fu, Lin & Wang, Zhe & Zhang, Shigang, 2019. "A theoretical fundamental investigation on boilers equipped with vapor-pump system for Flue-Gas Heat and Moisture Recovery," Energy, Elsevier, vol. 171(C), pages 956-970.

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