대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제40권9호
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  • Pages.577-587
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  • 2016
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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가동조건 변화에 따른 순산소 마일드 연소 형성 연구

Formation of Oxy-Fuel MILD Combustion under Different Operating Conditions

  • 이필형 (인천대학교 기계시스템공학부) ;
  • 황상순 (인천대학교 기계시스템공학부)
  • Lee, Pil Hyong (Division of Mechanical System Engineering, Incheon Nat'l Univ.) ;
  • Hwang, Sang Soon (Division of Mechanical System Engineering, Incheon Nat'l Univ.)
  • 투고 : 2016.03.30
  • 심사 : 2016.07.10
  • 발행 : 2016.09.01
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초록

순산소 마일드 연소는 공기를 사용하는 연소에 비하여 열효율 및 연소안정성이 높고 배기가스 배출량이 낮아 유망한 연소기술 중 하나로 알려져 있지만 마일드 화염의 형성에는 아직까지 많은 어려움이 있는 실정이다. 본 논문에서는 순산소 마일드 형성을 위하여 연소기 형상 및 운전조건 변화가 순산소 마일드 연소에 미치는 영향을 3차원 수치해석을 적용하여 분석하였다. 수치해석 결과 마일드 연소화염의 특징인 고온영역과 평균온도를 감소시키는 데 있어서 산화제유속 증가가 보다 효과적임을 확인하였다. 또한 외부 예열이 없는 조건에서도 최적화된 산소-연료 공급조건에서 순산소 마일드 연소화염의 형성 가능성을 확인하였고 안정적인 순산소 마일드 연소는 당량비 0.90, 연료유속 10 m/s, 산소유속 200 m/s, 노즐간 거리 33.5 mm 조건에서 보다 안정적으로 형성됨을 확인할 수 있었다.

Although the formation of oxy-fuel MILD combustion is considered one of the promising combustion technologies for high thermal efficiency, low emissions and stability have been reported as difficulties. In this paper, the effect of combustor geometry and operating conditions on the formation of oxy-fuel MILD combustion was analyzed using numerical simulation. The results show that the high temperature region and average temperature decreased due to an increase in oxygen inlet velocity; moreover, a high degree of temperature uniformity was achieved using an optimized combination of fuels and an oxygen injection configuration without external oxygen preheating. In particular, the oxy-fuel MILD combustion flame was found to be very stable with a combustion flame region at equivalence ratio 0.90, fuel velocity 10 m/s, oxygen velocity 200 m/s, and nozzle distance 33.5 mm.

키워드

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