Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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A Study on the Effects of Hydrogen Addition and Swirl Intensity in CH4-Air Premixed Swriling Flames

메탄-공기 예혼합 선회화염에서 수소첨가와 선회강도 영향에 관한 연구

  • KIM, HAN SEOK (Department of Clean Fuel & Power Generation, Korea Institute of Machinery & Materials) ;
  • CHO, JU HYEONG (Department of Clean Fuel & Power Generation, Korea Institute of Machinery & Materials) ;
  • KIM, MIN KUK (Department of Clean Fuel & Power Generation, Korea Institute of Machinery & Materials) ;
  • HWANG, JEONGJAE (Department of Clean Fuel & Power Generation, Korea Institute of Machinery & Materials) ;
  • LEE, WON JUNE (Department of Clean Fuel & Power Generation, Korea Institute of Machinery & Materials)
  • 김한석 (한국기계연구원 청정연료발전연구실) ;
  • 조주형 (한국기계연구원 청정연료발전연구실) ;
  • 김민국 (한국기계연구원 청정연료발전연구실) ;
  • 황정재 (한국기계연구원 청정연료발전연구실) ;
  • 이원준 (한국기계연구원 청정연료발전연구실)
  • Received : 2019.10.10
  • Accepted : 2019.12.30
  • Published : 2019.12.30
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Abstract

The combustion characteristics of methane/hydrogen pre-mixed flame have been investigated with swirl stabilized flame in a laboratory-scale pre-mixed combustor with constant heat load of 5.81 kW. Hydrogen/methane fuel and air were mixed in a pre-mixer and introduced to the combustor through a burner nozzle with different degrees of swirl angle. The effects of hydrogen addition and swirl intensity on the combustion characteristics of pre-mixed methane flames were examined using particle image velocimetry (PIV), micro-thermocouples, various optical interference filters and gas analyzers to provide information about flow velocity, temperature distributions, and species concentrations of the reaction field. The results show that higher swirl intensity creates more recirculation flow, which reduces the temperature of the reaction zone and, consequently, reduces the thermal NO production. The distributions of flame radicals (OH, CH, C2) are dependent more on the swirl intensity than the percentage of hydrogen added to methane fuel. The NO concentration at the upper part of the reaction zone is increased with an increase in hydrogen content in the fuel mixture because higher combustibility of hydrogen assists to promote faster chemical reaction, enabling more expansion of the gases at the upper part of the reaction zone, which reduces the recirculation flow. The CO concentration in the reaction zone is reduced with an increase in hydrogen content because the amount of C content is relatively decreased.

Keywords

References

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