Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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Numerical Investigation of Low-pollution Combustion with applying Flue Gas Recirculation in Counterflow Flames: Part I. Combustion Characteristics of Low NOx

대향류 화염에서 FGR이 적용된 저공해 연소의 수치적 해석: Part I. 저 NOx 연소특성

  • Cho, Seo-Hee (Department of Aerospace Engineering, Sunchon National University) ;
  • Lee, Kee-Man (School of Mechanical and Aerospace Engineering, Sunchon National University)
  • 조서희 (순천대학교 우주항공공학과) ;
  • 이기만 (순천대학교 기계.우주항공공학부)
  • Received : 2019.11.13
  • Accepted : 2019.12.24
  • Published : 2019.12.31
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Abstract

One of the methods for low-pollution combustion, flue gas recirculation(FGR) is effective to reduce nitrogen oxides and it was applied in CH4/air premixed counterflow flames to identify the change of flame characteristics and NOx mechanisms. Considering that the mole fraction of the products varied depending on the strain rates, the major products: CO2, H2O, O2 and N2 were recirculated as a diluent to reflect the actual combustion system. With the application of the FGR technique, a turning point of maximum flame temperature under certain strain rate condition was found. Furthermore as the recirculation ratio increased, the tendency of NO was changed before and after the turning point and the analysis on thermal NO and Fenimore NO production was conducted.

저공해 연소를 위한 방법 중 하나인 배기가스 재순환(flue gas recirculation, 이하 FGR)은 질소산화물 저감에 효과적인 연소 기법이다. 이를 메탄/공기 대향류 예혼합화염에 적용하여 화염의 특성변화와 NOx 생성 기구를 파악하기 위한 수치해석을 진행하였다. 신장률에 따라 배출되는 생성물들의 몰분율이 달라진다는 점을 고려하여 재순환율은 생성물을 기준으로 정의되었으며, 실제 연소 시스템을 반영하기 위해 주요 생성물인 CO2, H2O, O2 그리고 N2를 희석제로써 재순환하였다. FGR 기법이 적용됨에 따라 특정한 신장률 조건에서 최대화염 온도의 전환점이 발견되었다. 또한, 재순환율이 증가함에 따라 온도와 NO의 경향이 달리 나타났으며, 이를 파악하고자 NO 반응을 열적 NO와 Fenimore NO로 구분하여 분석하였다.

Keywords

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