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Study on the combustion characteristics of a premixed combustion system with exhaust gas recirculation

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

Abstract

The boiler of a premixed combustion system with EGR (exhaust gas recirculation) is investigated to explore the potential for increasing thermal efficiency and lowering pollutant emissions. To achieve this purpose, a thermodynamic analysis is performed to predict the effect of EGR on the thermodynamic efficiency for various equivalence ratios. Experiments of a preheated air condensing boiler with EGR were conducted to measure the changes in the thermal efficiency and the characteristics of the pollutant emission. Finally, a 1-D premixed code was calculated to understand the effect of the EGR method on the NO reduction mechanism. The results of the thermodynamic analysis show that the thermodynamic efficiency is not changed because the temperature and the amount of the exhaust gas are unchanged, even though the EGR method is implemented in the system. However, when the EGR method is used with an equivalence ratio near 1.00, it is experimentally verified that the thermal efficiency increases and the NOx concentration decreases. Based on the results from numerical calculations, it is shown that the NO production rates of N + O2 ↔ NO + O and N + OH ↔ NO + H are remarkably changed due to the decrease in the flame temperature and the NO mole fraction is decreased.

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  • 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.
    • Handle: RePEc:eee:energy:v:61:y:2013:i:c:p:345-353
    DOI: 10.1016/j.energy.2013.08.057
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    References listed on IDEAS

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    1. Yu, Byeonghun & Kum, Sung-Min & Lee, Chang-Eon & Lee, Seungro, 2013. "Combustion characteristics and thermal efficiency for premixed porous-media types of burners," Energy, Elsevier, vol. 53(C), pages 343-350.
    2. Lakshmanan, T. & Nagarajan, G., 2011. "Study on using acetylene in dual fuel mode with exhaust gas recirculation," Energy, Elsevier, vol. 36(5), pages 3547-3553.
    3. Park, Cheolwoong & Kim, Sungdae & Kim, Hongsuk & Moriyoshi, Yasuo, 2012. "Stratified lean combustion characteristics of a spray-guided combustion system in a gasoline direct injection engine," Energy, Elsevier, vol. 41(1), pages 401-407.
    4. 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.
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    Cited by:

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    4. Zhao, Hao & Dana, Alon G. & Zhang, Zunhua & Green, William H. & Ju, Yiguang, 2018. "Experimental and modeling study of the mutual oxidation of N-pentane and nitrogen dioxide at low and high temperatures in a jet stirred reactor," Energy, Elsevier, vol. 165(PB), pages 727-738.
    5. 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.
    6. 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.
    7. Khabbazian, Ghasem & Aminian, Javad & Khoshkhoo, Ramin Haghighi, 2022. "Experimental and numerical investigation of MILD combustion in a pilot-scale water heater," Energy, Elsevier, vol. 239(PA).

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