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Performances of a heat exchanger and pilot boiler for the development of a condensing gas boiler

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  • Lee, Seungro
  • Kum, Sung-Min
  • Lee, Chang-Eon

Abstract

In this research, design factors for a heat exchanger and boiler were investigated using a simplified model of a heat exchanger and pilot condensing boiler, respectively. Specifications of each heat exchanger component (e.g., upper heat exchanger (UHE) and lower heat exchanger (LHE); coil heat exchanger (CHE); baffles) were investigated using a model apparatus, and the comprehensive performance of the pilot gas boiler was examined experimentally. The heating efficiency of the boiler developed was about 90% when using the optimal designed heat exchangers. Compared to a conventional Bunsen-type boiler, the heating efficiency was improved about 10%. Additionally, NOx and CO emissions were about 30ppm and 160ppm, respectively, based on a 0% O2 basis at an equivalence ratio of 0.70, which is an appropriate operating condition. However, the pollutant emission of the boiler developed is satisfactory considering the emission performance of a condensing boiler, even though CO emission must be reduced.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:7:p:3945-3951
    DOI: 10.1016/j.energy.2011.05.018
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    References listed on IDEAS

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    1. Kermes, Vít & Be˘lohradský, Petr & Oral, Jaroslav & Stehlík, Petr, 2008. "Testing of gas and liquid fuel burners for power and process industries," Energy, Elsevier, vol. 33(10), pages 1551-1561.
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    3. Lee, Jaepark & Kim, Jong-Min & Lee, Seungro & Lee, Chang-Eon, 2011. "A study on the effects of CO-tubes insertion on the emission characteristics of a compact heat exchanger," Energy, Elsevier, vol. 36(3), pages 1652-1658.
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    2. 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.
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    5. Yu, Byeonghun & Kum, Sung-Min & Lee, Chang-Eon & Lee, Seungro, 2012. "An experimental study of heat transfer and pollutant emission characteristics at varying distances between the burner and the heat exchanger in a compact combustion system," Energy, Elsevier, vol. 42(1), pages 350-357.
    6. Liu, Fengguo & Zheng, Longfeng & Zhang, Rui, 2020. "Emissions and thermal efficiency for premixed burners in a condensing gas boiler," Energy, Elsevier, vol. 202(C).
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    10. Li, Zhouhang & Zhai, Yuling & Li, Kongzhai & Wang, Hua & Lu, Junfu, 2016. "A quantitative study on the interaction between curvature and buoyancy effects in helically coiled heat exchangers of supercritical CO2 Rankine cycles," Energy, Elsevier, vol. 116(P1), pages 661-676.
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