Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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Numerical Study on Soot Formation in Opposed-flow Nonpremixed Flame by Mixing Toluene

톨루엔 혼합에 따른 대향류 확산화염 내 매연 생성에 대한 수치적 연구

  • Choi, Jae-Hyuk (Division of Marine System Engineering Korea Maritime University) ;
  • Yoon, Seok-Hun (Division of Marine System Engineering Korea Maritime University) ;
  • Yoon, Doo-Ho (Busan Campus of Korea Polytechinics VII)
  • 최재혁 (한국해양대학교 기관시스템공학부) ;
  • 윤석훈 (한국해양대학교 기관시스템공학부) ;
  • 윤두호 (한국폴리텍 VII대학 부산캠퍼스 컴퓨터응용금형과)
  • Received : 2012.01.26
  • Accepted : 2012.04.23
  • Published : 2012.04.30
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Abstract

A numerical simulation has been performed to investigate effects of toluene mixing on soot formation in pure ethylene opposed-flow nonpremixed flame. Mixture ratios of toluene were 3%, 5%, 10%, and 20%. Senkin code for 0-D simulation and oppdif code for 1-D simulation based on CHEMKIN III were utilized. 0-D results by senkin showed that concentrations of methyl radicals and benzene were increased with increasing toluene mixture ratio. This implied that the mixing of toluene in pure ethylene diffusion flame produces more PAHs and soot than those of pure ethylene flame. 1-D result of 10 % toluene reaction by oppdif code showed that production rate for H radical was a crucial factor for benzene formation. These results imply that methyl radical, benzene and H radical play a important role on soot formation in diffusion flames.

매연 생성에 대하여 톨루엔의 영향을 알아보기 위하여 순수에틸렌 대향류 확산화염에 톨루엔을 소량 혼합하여 수치해석을 수행하였다. 톨루엔($C_7H_8$)의 혼합 비율은 3%, 5%, 10%, 및 20%로 하였다. 계산에는 CHEMKIN III 기반의 Senkin 코드와 oppdif 코드를 이용하여 0-D 계산과 1-D 계산을 수행하였다. 0-D의 Senkin 계산에서는 톨루엔의 혼합율이 증가할수록 메틸라디칼의 농도는 증가하고 이에 따른 벤젠의 농도도 증가하였다. 이는 순수 에틸렌 화염에 톨루엔을 혼합할 경우 더 많은 매연이 생성될 것이라는 걸 의미한다. oppdif 코드에 의한 1-D 계산에서는 10% 톨루엔 반응식으로부터는 H 라디칼의 생성율이 결정적인 역할을 한다는 것을 알 수 있었다. 위 결과들로부터 확산화염 내 매연 생성에 있어 메틸라디칼, 벤젠과 H 라디칼이 중요한 역할을 한다는 것을 알 수 있었다.

Keywords

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