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

The Korean Society of Mechanical Engineers (대한기계학회)
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The Effect of Residence Time and Heat Loss on NOx Formation Characteristics in the Downstream Region of CH4/Air Premixed Flame

CH4/Air 예혼합화염의 하류영역에서 체류시간 및 열손실에 의한 NOx의 생성특성

  • 황철홍 (인하대학교 산업과학기술연구소) ;
  • 현승호 (인하대학교 대학원 기계공학과) ;
  • 탁영조 (인하공업전문대학 자동차과) ;
  • 이창언 (인하대학교 기계공학과)
  • Published : 2007.01.01
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Abstract

In this study, the NOx formation characteristics of one-dimensional $CH_4$/Air premixed flame using detailed-kinetic chemistry are examined numerically. The combustor length and the amount of heat loss are varied to investigate the effect of residence time and heat loss on the NOx formation in a post-flame region. In the flame region, NO is mainly produced by the Prompt NO mechanism including $N_2$O-intermediate NO mechanism over all equivalence ratios. However, thermal NO mechanism is more important than Prompt NO mechanism in the post-flame region. In the case of adiabatic condition, the increase of combustor length causes the remarkable increase of NO emission at the exit due to the increase of residence time. On the other hand, NO reaches the equilibrium state in the vicinity of flame region, considering radiation and conduction heat losses. Furthermore the NO, in the case of $\phi$=1.2, is gradually reduced in the downstream region as the heat loss is increased. From these results, it can be concluded that the controls of residence time and heat loss in a combustor should be recognized as an important NOx reduction technology.

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References

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