摘要
在420t/h电站燃煤锅炉尾部建立了选择性催化还原脱硝工业性试验装置,重点研究了NH3/NOx摩尔比、反应温度、反应空速等因素对烟气脱硝效率的影响.结果表明:当NH3/NOx摩尔比小于1时,脱硝效率随着NH3/NOx摩尔比的增大而提高;当NH3/NOx摩尔比大于1时,随着NH3/NOx摩尔比的增大,脱硝效率变化不明显;当NH3/NOx摩尔比为0.9、反应温度为325～350℃时,脱硝效率达到90%;当空速小于4760h-1时,随着空速提高,脱硝效率基本不变;当空速大于4760h-1后,脱硝效率随空速提高迅速降低.试验研究还发现:氨逃逸量随着NH3/NOx摩尔比的增大而逐渐增大;当NH3/NOx摩尔比小于0.95时,氨逃逸量均能满足设计要求;在325～350℃内,SO2/SO3转化率随反应温度的升高而提高,且均小于0.6%,符合设计要求.
A series of experimental tests were conducted to study the performance of a selective catalytic reduction （SCR） flue gas denitrification system for a 420 t/h coal-fired boiler, with focus on the influence of NH3/NOx molar ratio, reaction temperature and space velocity on its denitrification efficiency. Results show that when the molar ratio of NH3/NOx is less than 1, the denitrification efficiency will rise with growing molar ratio of NH3/NOx ; and when the molar ratio is larger than 1, the denitrification efficiency will nearly remain the same; whereas when the molar ratio is 0.9 and the reaction temperature lies in 325- 350 ℃, the denitrification efficiency may reach 90%. The denitrification efficiency will basically remain the same with rising space velocity when the latter one is less than 4 760 h^-1, but drop rapidly when the velocity gets larger than 4 760 h^-1. The NH3 escape rate will rise with growing molar ratio of NHa/NOx, and if the molar ratio keeps below 0.95, the design requirement of NH3 escape rate can be satisfied. Within 325- 350 ℃, the conversion rate of SO2/SO3 will rise with the growth of temperature, which is to be kept below 0.6%, meaning the design requirement can be met.
出处
《动力工程学报》
CAS
CSCD
北大核心
2010年第6期439-443,共5页
Journal of Chinese Society of Power Engineering
基金
浙江省自然科学基金资助项目(Y5080087)
关键词
燃煤电厂
选择性催化还原
性能试验
氮氧化物
氨逃逸
coal-fired power plant
selective catalytic reduction
performance test
NO,
ammonia slip
