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An analysis of the thermodynamic efficiency for exhaust gas recirculation-condensed water recirculation-waste heat recovery condensing boilers (EGR-CWR-WHR CB)

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  • Lee, Chang-Eon
  • Yu, Byeonghun
  • Lee, Seungro

Abstract

This study presents fundamental research on the development of a new boiler that is expected to have a higher efficiency and lower emissions than existing boilers. The thermodynamic efficiency of exhaust gas recirculation-condensed water recirculation-waste heat recovery condensing boilers (EGR-CWR-WHR CB) was calculated using thermodynamic analysis and was compared with other boilers. The results show the possibility of obtaining a high efficiency when the temperature of the exhaust gas is controlled within 50–60 °C because water in the exhaust gas is condensed within this temperature range. In addition, the enthalpy emitted by the exhaust gas for the new boiler is smaller because the amount of condensed water is increased by the high dew-point temperature and the low exhaust gas temperature. Thus, the new boiler can obtain a higher efficiency than can older boilers. The efficiency of the EGR-CWR-WHR CB proposed in this study is 93.91%, which is 7.04% higher than that of existing CB that is currently used frequently.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:86:y:2015:i:c:p:267-275
    DOI: 10.1016/j.energy.2015.04.042
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    References listed on IDEAS

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    1. Lee, Seungro & Kum, Sung-Min & Lee, Chang-Eon, 2011. "Performances of a heat exchanger and pilot boiler for the development of a condensing gas boiler," Energy, Elsevier, vol. 36(7), pages 3945-3951.
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    5. Yu, Byeonghun & Kum, Sung-Min & Lee, Chang-Eon & Lee, Seungro, 2013. "Effects of exhaust gas recirculation on the thermal efficiency and combustion characteristics for premixed combustion system," Energy, Elsevier, vol. 49(C), pages 375-383.
    6. Yu, Byeonghun & Kum, Sung-Min & Lee, Chang-Eon & Lee, Seungro, 2013. "Study on the combustion characteristics of a premixed combustion system with exhaust gas recirculation," Energy, Elsevier, vol. 61(C), pages 345-353.
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    Cited by:

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    8. Ramadan, Mohamad & Khaled, Mahmoud & Haddad, Ahmad & Abdulhay, Bakri & Durrant, Andy & El Hage, Hicham, 2018. "An inhouse code for simulating heat recovery from boilers to heat water," Energy, Elsevier, vol. 157(C), pages 200-210.
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    10. 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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