摘要
在淮南烟煤中浸渍添加尿素和（NH4）2SO4，研究复合再燃脱硝过程中N2O的生成特性．再燃实验在石英固定床反应器上进行，温度范围为800～1200℃．研究发现，复合再燃过程中，再燃和氮还原剂脱硝都会部分将NO转化成N2O，因此NO被还原的程度越大，N2O的排放浓度越高．氮还原剂的添加量越大，生成的N2O浓度越高，而添加尿素时的N2O排放量比添加硫酸铵时大得多．从NO转化成N2O的比例来说，使用氮还原剂添加量不大的情况下，与原煤再燃的N2O排放比例比较接近．随着反应器的温度的升高，N2O排放量迅速降低．低氧浓度亦有利于减少NO向N2O的转化．
Fixed bed experiments were done to study N2O formation during the advanced reburning process by adding nitrogen agents to Huainan pulverized bituminous coal（800--1 200℃）. Both reburning coal and nitrogen agents can turn NO in the simulated flue gas into N2O, therefore, N2O emission increases with the reduction of NO. Increasing the amount of additive agents also enhances NzO emission, and adding urea produces more N2O than （NH4 ）2SO4 adding urea. In most cases, the ratio of N2O formation to NO reduction is not much higher than that from baseline reburning. The ratio of NzO formation to NO reduction drops at a higher bed temperature and in a richer atmosphere.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2008年第4期323-327,共5页
Journal of Combustion Science and Technology
基金
国家自然科学基金资助项目(50776034)
关键词
环保
复合再燃
氮氧化物
氧化亚氮
environmental protection
advanced reburn
nitric oxides
nitrous oxide
