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A theoretical fundamental investigation on boilers equipped with vapor-pump system for Flue-Gas Heat and Moisture Recovery


  • Wang, Jingyi
  • Hua, Jing
  • Fu, Lin
  • Wang, Zhe
  • Zhang, Shigang


There is tremendous surplus heat in flue gas from gas boilers which cannot be efficiently recovered by conventional condensing heat exchangers. As one of heat recovery systems, boilers equipped with vapor-pump system (BEVP system) is complicated. To improve system performance, theoretical investigation and mathematical models are required. However, these are not proposed in previous work. In this study, thermodynamic work principles and moisture loop of BEVP system are analyzed. It utilizes the ‘constant vapor flux’ property of natural gas combustion and the humidity level of combustion generated vapor flux depends on the humidity level of combustion air. The system is divided into two subsystems for better understanding. Subsystem I is used for dehumidification, and subsystem II is for total heat recovery, serving as a ‘vapor pump’. The core optimization principle of BEVP system is to decrease the moisture transfer driven force of vapor pump, which is used for total heat recovery in Subsystem II. A mathematical model is established to quantitatively characterize the BEVP system. Analytical solutions are derived with clear physical significances and additivity property. The mathematical model is used to conduct performance analyses under various conditions. The systematic feasible domain is developed with iso-efficiency lines.

Suggested Citation

  • 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.
  • Handle: RePEc:eee:energy:v:171:y:2019:i:c:p:956-970
    DOI: 10.1016/

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    References listed on IDEAS

    1. Wang, Chaojun & He, Boshu & Yan, Linbo & Pei, Xiaohui & Chen, Shinan, 2014. "Thermodynamic analysis of a low-pressure economizer based waste heat recovery system for a coal-fired power plant," Energy, Elsevier, vol. 65(C), pages 80-90.
    2. Westerlund, Lars & Hermansson, Roger & Fagerström, Jonathan, 2012. "Flue gas purification and heat recovery: A biomass fired boiler supplied with an open absorption system," Applied Energy, Elsevier, vol. 96(C), pages 444-450.
    3. Zhao, X.B. & Tang, G.H. & Ma, X.W. & Jin, Y. & Tao, W.Q., 2014. "Numerical investigation of heat transfer and erosion characteristics for H-type finned oval tube with longitudinal vortex generators and dimples," Applied Energy, Elsevier, vol. 127(C), pages 93-104.
    4. Lee, Chang-Eon & Yu, Byeonghun & Lee, Seungro, 2015. "An analysis of the thermodynamic efficiency for exhaust gas recirculation-condensed water recirculation-waste heat recovery condensing boilers (EGR-CWR-WHR CB)," Energy, Elsevier, vol. 86(C), pages 267-275.
    5. 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.
    6. Heng Chen & Yungang Wang & Qinxin Zhao & Haidong Ma & Yuxin Li & Zhongya Chen, 2014. "Experimental Investigation of Heat Transfer and Pressure Drop Characteristics of H-type Finned Tube Banks," Energies, MDPI, Open Access Journal, vol. 7(11), pages 1-11, November.
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    Cited by:

    1. 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).


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