600MW亚临界机组锅炉SCR系统优化试验研究

600 MW sub-critical unit boiler SCR improvement test research

针对某亚临界600 MW机组选择性催化还原(SCR)系统存在变工况下耗氨量大,脱硝运行困难,氮氧化物波动较大和空预器堵塞等问题,对不同负荷(550,300 MW)下出口氮氧化物浓度场和流场进行分析研究,通过调节喷氨格栅实现了机组在不同负荷下运行的最优化,浓度场分布近乎均匀,测点左右偏差降低到15%以下,空预器阻力压差最大降幅为26.13%,可为同型号燃煤锅炉脱硝系统运行提供可靠的数据参考。

Based on the condition of a sub-critical 600 MW selective catalytic reduction( SCR) abnormal large ammonia consumption,denitration system operation difficult,NOxlarge fluctuation and air preheater blockage and other problems,the author analyzed the outlet NOxdensity and flow field. By adjusting ammonia injection grid,the unit operation was optimized,density field was almost equally distributed. Testing point deviation was lowered to under 15%. Decreasing of air preheater resistance pressure difference reach to 26. 13%.