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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received September 22, 2013
Accepted January 28, 2014

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Effects of diluents on NOx formation in coflow CH4/air diffusion flames

Huan Dong Yue Zhang¹ Zhongzhu Gu^†

School of Energy and Mechanical Engineering, Nanjing Normal University, No.78 Bancang Street, Nanjing 210042, China ¹Jiangsu Guoxin Yangzhou Power Generation Co., LTD., Bali Town, Yangzhou 225131, China

guzhongzhu@njnu.edu.cn

Korean Journal of Chemical Engineering, June 2014, 31(6), 1002-1007(6), 10.1007/s11814-014-0035-1

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Abstract

The effect of diluent addition on NOx formation in a laminar CH4/air coflow diffusion flame was investigated by numerical simulation with experimental verification. The hydrocarbon fuel stream was diluted with N2, CO2, and Ar. The volume fraction of diluents systematically changed from 0.0 to 0.5. The simulation data agree well with the experimental one. The computational results indicate that overall the three diluents reduce the formation of NO and the effects vary from weak to strong in the order: N2, Ar and CO2. Differences between the influences of the various diluents are discussed in terms of the thermal, the dilution and the direct chemical effects, respectively. Further, the addition of CO2 reduces the formation of NO2, while the addition of N2 or Ar has little effect on it. However, the formation rate of N2O increases by each of the added diluents.

Keywords

NOx Laminar Diffusion Flame Diluents

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