天然气再燃技术中再燃区空气过量系数和温度对再燃效果的影响  

Influence of the Stoichiometric Ratio and Temperature in Reduction Zone on Effect of Reburning by Natual Gas

作　　者：方斌[1] 陆方[1] 闫玉林[1] 罗永浩[1] 

机构地区：[1]上海交通大学机械与动力工程学院热能工程研究所,上海200240

出　　处：《锅炉技术》2005年第3期48-50,80,共4页Boiler Technology

摘　　要：论述了天然气再燃的基本反应机理,再燃区空气过量系数(氧浓度)对再燃反应机理的影响,并且分析比较了不同温度条件下再燃区空气过量系数(SR2)对再燃反应降低NOx排放效果的影响。在天然气再燃反应过程中,天然气可以通过高温热力分解或是氧化反应2条途径来还原NOx。在再燃温度为1200℃的低温情况下,当再燃区空气过量系数在0.93～0.94范围内,NOx还原效果最佳;而在1400℃的高温情况下,SR2的选取范围较宽,即使在SR2值很低的情况下,NOx还原效果仍较明显。此外,在考虑SR2对降低NOx排放效果的同时也应综合考虑燃料的燃尽程度以及飞灰的排放质量。This paper describes the reaction mechanism of natual gas reburning and the influence of the stoichiometric ratio (oxygen concentration) in reburning region on the reburning reaction. The influence of stoichiometric ratio in reburning region on the effect of NO_ x reduction by the reburning under different temperature is also summarized. The decomposition and oxidation of natural gas is considered to be two different routes for NO_ x reduction by natural gas reburning. In addition, the influence of selection of SR_ 2 on the burnout of fuels and unburned carbon on ash should be considered besides the effect of SR_ 2 on NO_ x reduction.

关 键 词：再燃 燃煤机组 空气过量系数 温度 NOx 

分 类 号：TK16[动力工程及工程热物理—热能工程]