Numerical analysis of pulverized coal combustion characteristics using advanced low-NOx burner

被引:138
作者
Kurose, R
Makino, H
Suzuki, A
机构
[1] Cent Res Inst Elect Power Ind, Yokosuka Res Lab, Kanagawa 2400196, Japan
[2] Cent Res Inst Elect Power Ind, CS Promot Off, Chiyoda Ku, Tokyo 1008126, Japan
[3] CD Adapco JAPAN Co LTD, Nishi Ku, Kanagawa 2208137, Japan
关键词
pulverized coal combustion; numerical simulation; advanced low-NOx; burner;
D O I
10.1016/j.fuel.2003.07.003
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
A three-dimensional numerical simulation is applied to a pulverized coal combustion field in a test furnace equipped with an advanced low-NOx burner called Cl-alpha burner, and the detailed combustion characteristics are investigated. In addition, the validities of the existing NOx formation and reduction models are examined. The results show that a recirculation flow is formed in the high-gas-temperature region near the Cl-alpha burner outlet, and this lengthens the residence time of coal particles in this high-temperature region, promotes the evolution of volatile matter and the progress of char reaction, and produces an extremely low-O-2 region for effective NO reduction. It is also found that, by lessening the effect of NO reduction in Levy et al.'s model and taking the NO formation from char N into account, the accuracy of the NO prediction is improved. The efficiency factor of the conversion of char N to NO affects the total NO concentration downstream after the injection of staged combustion air. (C) 2004 Elsevier Ltd. All rights reserved.
引用
收藏
页码:693 / 703
页数:11
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