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A study on the effects of CO-tubes insertion on the emission characteristics of a compact heat exchanger

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  • Lee, Jaepark
  • Kim, Jong-Min
  • Lee, Seungro
  • Lee, Chang-Eon

Abstract

The effects of CO-tubes insertion on NOx (nitrogen oxides) and CO emissions from a compact heat exchanger were numerically simulated using a quasi one-dimensional premixed flame model, and the results were compared to experiments with a laboratory-scale heat exchanger and a commercial compact condensing boiler with a heat exchanger installed. The “CO-tubes” means that pre-cooling tubes were inserted between the burner and the main heat exchanger to reduce CO concentration. In the numerical results, the outlet concentration of NO increased as the distance between the burner and the CO-tubes was increased up to 3 cm. However, NO concentration was little affected by the CO-tubes when the distance was greater than 3 cm. Additionally, the concentration of CO reached a minimum at the distance of 3 cm. CO concentration increased when the distance from the burner to the CO-tubes was increased or decreased between 2 cm and 3 cm. These simulated results showed good agreement with the experimental results using a laboratory-scale heat exchanger. However, the maximum and minimum distances for NO and CO concentrations were different. When the CO-tubes were subsequently applied in a working commercial boiler, CO concentration was dramatically reduced by the CO-tubes and NO concentration was also slightly decreased.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:3:p:1652-1658
    DOI: 10.1016/j.energy.2010.12.065
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    References listed on IDEAS

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    1. Macor, A. & Pavanello, P., 2009. "Performance and emissions of biodiesel in a boiler for residential heating," Energy, Elsevier, vol. 34(12), pages 2025-2032.
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    1. 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.
    2. Liu, Fengguo & Zheng, Longfeng & Zhang, Rui, 2020. "Emissions and thermal efficiency for premixed burners in a condensing gas boiler," Energy, Elsevier, vol. 202(C).
    3. 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.
    4. Yu, Byeonghun & Lee, Seungro & Lee, Chang-Eon, 2015. "Study of NOx emission characteristics in CH4/air non-premixed flames with exhaust gas recirculation," Energy, Elsevier, vol. 91(C), pages 119-127.
    5. 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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