• Title/Summary/Keyword: Nitrgen oxide(NOx)

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The Role of Oxygen Atom in the NOx Formation of DME/Air Nonpremixed Flames (DME/Air 비예혼합화염의 NOx 생성에서 산소원자의 역할)

  • Kim, Tae-Hyun;Hwang, Cheol-Hong;Lee, Seung-Ro;Lee, Chang-Eon
    • Journal of the Korean Society of Combustion
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    • v.14 no.1
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    • pp.9-18
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    • 2009
  • The NOx emission characteristics of DME in counterflow nonpremixed flames were investigated numerically, and brief experiments were carried out to compare the flame shapes and NOx emissions with those of $C_{3}H_{8}$ and $C_{2}H_{6}$. The DME flames were calculated using Kaiser's mechanism, while the $C_{2}H_{6}$ flames were calculated using the $C_3$ mechanism. These mechanisms were combined with the modified Miller-Bowman mechanism for the analysis of NOx. Experimental results show that DME flame has the characteristics of partial premixed flame and the flame length becomes very shorter compared with general hydrocarbon fuels and then, the NOx emission of DME is low as much as 60 % of $C_{3}H_{8}$. In the calculated results of counterflow nonpremixed flames, the $EI_{NO}$ of DME nonpremixed flame is low as much as 50 % of the $C_{2}H_{6}$ nonpremixed flame. The cause of $EI_{NO}$ reduction is attributed mainly to the characteristics of partial premixed flame due to the existence of O atom in DME and partly to the O-C bond in DME, instead of C-C bond in hydrocarbon fuels.

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Fundamental Studies on NOx Emission Characteristics in a Dimethyl Ether/Air Nonpremixed Flame (DME/Air 비예혼합화염의 NOx 생성 특성에 관한 기초 연구)

  • Kim, Tae-Hyun;Kim, Jong-Hyun;Lee, Chang-Eon
    • Proceedings of the KSME Conference
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    • 2008.11b
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    • pp.1973-1978
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    • 2008
  • The NOx emission characteristics of DME in counterflow nonpremixed flames were investigated numerically, and brief experiments were carried out to compare the flame shapes and NOx emissions with those of $C_3H_8$ and $C_2H_6$. The DME flames were calculated using Kaiser's mechanism, while the $C_2H_6$ flames were calculated using the $C_3$ mechanism. These mechanisms were combined with the modified Miller-Bowman mechanism for the analysis of NOx. Experimental results show that DME flame has the characteristics of partial premixed flame and the flame length becomes very shorter compared with general hydrocarbon fuels and then, the NOx emission of DME is low as much as 60% of $C_3H_8$. In the calculated results of counterflow nonpremixed flames, the EINO of DME nonpremixed flame is low as much as 50% of the $C_2H_6$ nonpremixed flame. The cause of $EI_{NO}$ reduction is attributed mainly to the characteristics of partial premixed flame due to the existence of O atom in DME and partly to the O-C bond in DME, instead of C-C bond in hydrocarbon fuels.

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