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http://dx.doi.org/10.3795/KSME-B.2007.31.1.099

The Effect of Residence Time and Heat Loss on NOx Formation Characteristics in the Downstream Region of CH4/Air Premixed Flame  

Hwang, Cheol-Hong (인하대학교 산업과학기술연구소)
Hyun, Sung-Ho (인하대학교 대학원 기계공학과)
Tak, Young-Jo (인하공업전문대학 자동차과)
Lee, Chang-Eon (인하대학교 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.31, no.1, 2007 , pp. 99-108 More about this Journal
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.
Keywords
NOx; Premixed Flame; Post-flame Region; Residence Time; Heat Loss;
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Times Cited By KSCI : 1  (Citation Analysis)
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