摘要
以某火电厂330 MW机组选择性催化还原(SCR)烟气脱硝系统为例,针对运行中存在的氨逃逸率高、空气预热器压差大、脱硝反应器出口与烟囱入口NO_x浓度监测数据偏差大等问题,进行了流场、浓度场测试及催化剂检测。结果表明,流场分布不均是造成催化剂磨损的主要因素;催化剂活性下降、喷氨流量分布不合理是造成脱硝系统故障的原因;通过喷氨优化调整可以改善脱硝反应器出口NO_x浓度分布均匀性,降低氨逃逸率。同时结合诊断分析,对电厂脱硝系统的改造提出了建议。
Taking the SCR （selective catalytic reduction） system in a 330-MW power plant as an example, the concentration and flow distribution measurement and catalyst detection arc carried out to solve the problems occurred during the operation, such as the high ammonia escape rate, the large pressure difference of the air preheater and the high NOx concentration deviation between the SCR outlet and the stack inlet. The results show that the uneven flow distribution is the major cause for catalyst corrosion, and the decreased activity of the catalyst and the unreasonable ammonia injection contribute to the fault of the SCR system. Through optimal adjustment of the ammonia injection, the distribution of SCR outlet NOx concentration is improved and the ammonia escape is reduced. Meanwhile, suggestions for the SCR system upgrading are proposed based on the diagnosis analysis.
出处
《中国电力》
CSCD
北大核心
2016年第5期63-66,75,共5页
Electric Power
关键词
选择性催化还原
流场
催化剂
喷氨
故障诊断
selective catalytic reduction
flow distribution
catalyst
ammonia injection
fault diagnosis
