天然气再燃烧降低NO_x的数值模拟研究  

Numerical Simulation about Natural Gas Reburn to Reduces NO_x

作　　者：陈朝晖[1] 张忠孝[1] 

机构地区：[1]上海理工大学动力工程学院

出　　处：《电站系统工程》2008年第5期13-16,共4页Power System Engineering

摘　　要：对实验用管式炉进行数值模拟计算。采用标准k-ε湍流模型、NOx生成模型,对管式锅炉内的流场情况、管式锅炉内的NOx的浓度进行模拟计算。模拟计算表明,提高再然区温度有利于NOx的还原,再燃区过量空气系数越小越有利于NOx的还原,再燃天然气数量的增加可降低NOx浓度的排放,同时再燃天然气的比例提高到一定的水平,再增加天然气数量后对还原NOx的影响逐步减小。Based on CFD, the process of coal reburning in a boiler was simulated. The effect of some key factor such as rebum zone temperature, stoichiometric coefficient and rebum rate on NOx formation regulation was studied on a one-dimensional test system with multi-function such as air stage and fuel rebuming. The results showed that the NOx reduction efficient increased with the increase of therebum zone temperature. There existed an optimum value （0.8-0.9） for rebum zone stoichiometric coefficient. Given the economical reason, the best rate of reburning is 20%.

关 键 词：管式炉 天然气再燃 NOx还原 数值模拟 

分 类 号：X701.7[环境科学与工程—环境工程]