600MW机组SCR性能诊断与分析

引对福建省某600MW火电机组液氨耗量较大问题，进行SCR速度场和氨逃逸测定，为降低液氨耗量提供理论依据。通过微压计和气体分析仪测量SCR出入口烟气速度和NH3逃逸，并使用Tecplot对数据进行后处理。分析结果显示SCR入口烟道的布置方式对烟气流场有较大影响。速度场对氨逃逸有较大影响，脱硝效率越高NH3逃逸率越高；SCR出口速度场和NH3逃逸率间接反映催化剂的活性和堵塞情况，出口速度场高速区的存在可能会对管道带来磨损。

Diagnosis and Analysis on SCR Performance of 600-MW Units

Aiming at the issue of high ammonia consumption in one 600-MW unit in Fujian Province, the SCR vehwity field and ammonia slip are measured as theoretical evidences to reduce the ammonia slip volume. The flue gas velocity and ammonia slip at the SCR inlet and outlet wtlues are measured by using micro-manometer and gas analyzer and then the measurement data are pust-prncessed by using Tecplot. The analysis resuhs show that the SCR inlet arrangement significantly affects the flue gas velocity distribution while the flue gas velocity fieht has great impacts on the ammonia slipping. The higher the NO3 capture effieieucy, the higher ammonia slip rate will be reached. The SCR nutlel flue gas velocity field and the ammonia slip rate indirectly reflect the activity as well as the plugging of catalysts. Moreover, piping wearing may occur due to the existence of high velocity area at the outlet.