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Title: The interaction between soot and NO formation in a laminar axisymmetric coflow ethylene/air diffusion flame

Abstract

The interaction between soot and NO formation in a laminar axisymmetric coflow ethylene/air diffusion flame was investigated by numerical simulation. A detailed gas-phase reaction scheme and a simplified soot model were employed. The results show that the formation of NO has little effect on that of soot. However, the formation of soot in the flame significantly suppresses the formation of NO. The peak NO concentration and NO emission index are reduced by 28 and 46%, respectively, due to the formation of soot. The influence of soot on NO formation is caused by not only the radiation-induced thermal effect, but also the reaction-induced chemical effect. Relatively the thermal effect is more significant, causing 25 and 38% reduction, respectively, in peak NO concentration and NO emission index. The chemical effect is caused by the competition for acetylene (C{sub 2}H{sub 2}) between soot and NO formation. The formation of soot consumes acetylene in the flame and thus lowers the formation rate of radical CH. This reduces the reaction rate of CH + N{sub 2} = HCN + N, which is the rate-limiting step of the prompt NO formation route, the dominant route in the studied flame. (author)

Authors:
;  [1]
  1. Institute for Chemical Process and Environmental Technology, National Research Council Canada, 1200 Montreal Road, Ottawa, ON, K1A 0R6 (Canada)
Publication Date:
OSTI Identifier:
20880651
Resource Type:
Journal Article
Resource Relation:
Journal Name: Combustion and Flame; Journal Volume: 149; Journal Issue: 1-2; Other Information: Elsevier Ltd. All rights reserved
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; SOOT; ACETYLENE; ETHYLENE; AIR; AXIAL SYMMETRY; LAMINAR FLAMES; DIFFUSION; HYDROCYANIC ACID; COMBUSTION KINETICS; SYNTHESIS; NITRIC OXIDE; COMPUTERIZED SIMULATION; RADICALS

Citation Formats

Guo, Hongsheng, and Smallwood, Gregory J. The interaction between soot and NO formation in a laminar axisymmetric coflow ethylene/air diffusion flame. United States: N. p., 2007. Web. doi:10.1016/J.COMBUSTFLAME.2006.11.006.
Guo, Hongsheng, & Smallwood, Gregory J. The interaction between soot and NO formation in a laminar axisymmetric coflow ethylene/air diffusion flame. United States. doi:10.1016/J.COMBUSTFLAME.2006.11.006.
Guo, Hongsheng, and Smallwood, Gregory J. Sun . "The interaction between soot and NO formation in a laminar axisymmetric coflow ethylene/air diffusion flame". United States. doi:10.1016/J.COMBUSTFLAME.2006.11.006.
@article{osti_20880651,
title = {The interaction between soot and NO formation in a laminar axisymmetric coflow ethylene/air diffusion flame},
author = {Guo, Hongsheng and Smallwood, Gregory J.},
abstractNote = {The interaction between soot and NO formation in a laminar axisymmetric coflow ethylene/air diffusion flame was investigated by numerical simulation. A detailed gas-phase reaction scheme and a simplified soot model were employed. The results show that the formation of NO has little effect on that of soot. However, the formation of soot in the flame significantly suppresses the formation of NO. The peak NO concentration and NO emission index are reduced by 28 and 46%, respectively, due to the formation of soot. The influence of soot on NO formation is caused by not only the radiation-induced thermal effect, but also the reaction-induced chemical effect. Relatively the thermal effect is more significant, causing 25 and 38% reduction, respectively, in peak NO concentration and NO emission index. The chemical effect is caused by the competition for acetylene (C{sub 2}H{sub 2}) between soot and NO formation. The formation of soot consumes acetylene in the flame and thus lowers the formation rate of radical CH. This reduces the reaction rate of CH + N{sub 2} = HCN + N, which is the rate-limiting step of the prompt NO formation route, the dominant route in the studied flame. (author)},
doi = {10.1016/J.COMBUSTFLAME.2006.11.006},
journal = {Combustion and Flame},
number = 1-2,
volume = 149,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}