摘要
某360 MW燃煤机组启机后,脱硝装置氨耗量不断增加,直至喷氨阀门全开,NO x排放浓度接近50 mg/m 3,存在超标风险。经过诊断发现启机过程中,在脱硝装置入口烟温不足的情况下,脱硝系统提前约5 h投运;且启机之后脱硝装置入口烟温长期偏低,造成硫酸氢铵在催化剂床层中生成及沉积量增大,堵塞催化剂微孔,导致催化剂活性下降较快。通过分析原因,制定了升高脱硝装置入口烟温的方案,调整后脱硝效率升高,且氨耗量明显下降。该研究为同类问题的解决提供了参考。
After the start-up of a 360 MW coal-fired unite,the ammonia consumption of denitrification facilities increased until the ammonia injection valve was fully opened,and the NO x emission concentration was close to 50 mg/m 3,at the risk of exceeding the standard.After diagnosis,it was found that during the start-up process,the denitrification system was put into operation about 5 hours in advance under the condition of low flue gas temperature at the inlet of denitrification facilities.After the start-up,the flue gas temperature at the inlet of denitrification facilities was low for a long time,which resulted in more formation and deposition of ammonium bisulfate in the catalyst bed.This can block the micropores of the catalyst and lead to a rapid decrease in catalyst activity.Through the analysis of the reasons,the scheme of increasing the inlet flue gas temperature of denitrification facilities was implemented.After adjustment,the denitrification efficiency increased and the ammonia consumption decreased obviously.It provides a reference for solving similar problems.
作者
廉珂
田平
贺改
LIAN Ke;TIAN Ping;HE Gai
出处
《电力科技与环保》
2020年第4期27-30,共4页
Electric Power Technology and Environmental Protection
关键词
启机
烟温
脱硝效率
氨耗量
硫酸氢铵
start-up
flue gas temperature
denitration efficiency
ammonia consumption
ammonium bisulfate
