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%.
出处
《电站系统工程》
北大核心
2008年第5期13-16,共4页
Power System Engineering
关键词
管式炉
天然气再燃
NOx还原
数值模拟
boiler
natural gas reburn
NOx reduction
numerical simulation
