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Effect of gas nonlinearity on boilers equipped with vapor-pump (BEVP) system for flue-gas heat and moisture recovery


  • Wang, Jingyi
  • Hua, Jing
  • Fu, Lin
  • Zhou, Ding


Conventional condensing heat exchangers are considered inefficient in the recovery of surplus heat in flue gas from gas boilers. Different waste heat recovery schemes have emerged for improving the efficiency. The boilers equipped with vapor-pump system (BEVP system) is one of such schemes. This paper focuses on the investigation of gas nonlinearity effect on the overall performance of a BEVP system. It is found that gases are varied-heat-capacity fluids during heat exchange in a BEVP system. Due to gas nonlinearity effect, there is an operation limit for the Subsystem II and thereby the overall system. With the increase of thermal-network return (TNR) water temperature from 45 °C to 65 °C, the maximum system efficiency declines from 92.5% to 74.6%. Also, the maximum TNR water temperature that becomes to cause a significant adverse impact on the operation of the BEVP system appears to be 81.8 °C. To mitigate the gas nonlinearity effect, an optimized configuration is proposed for the BEVP system. Under the optimized configuration, the heat exchange efficiency of the Subsystem II is elevated considerably, namely latent heat exchange efficiency and total heat recovery efficiency both climbing by 14%. In addition, if there were infinite stages inside the Subsystem II, the total heat recovery efficiency would be 100%.

Suggested Citation

  • 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).
  • Handle: RePEc:eee:energy:v:198:y:2020:i:c:s0360544220304825
    DOI: 10.1016/

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    References listed on IDEAS

    1. 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.
    2. 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.
    3. 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.
    4. 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.
    5. 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.
    6. Brückner, Sarah & Liu, Selina & Miró, Laia & Radspieler, Michael & Cabeza, Luisa F. & Lävemann, Eberhard, 2015. "Industrial waste heat recovery technologies: An economic analysis of heat transformation technologies," Applied Energy, Elsevier, vol. 151(C), pages 157-167.
    7. 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.
    8. 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.
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