关键词: NO_x, SCR脱硝设备, 氨逃逸, 烟气速度, 优化

Abstract: Through the test study on the SCR denitration device in coal-fired power plants, it is observed that the air leakage in the SCR equipments and the electrostatic precipitator cause the NO_x emission concentration to increase. Moreover, the differences of flue gas speed and the unevenness of NH₃ /NO_x ratio at SCR device inlet also contribute to the ammonia slip increase and thus lower down the denitration efficiency. Therefore, the regulation on these parameters is conducted, which can successfully alleviate the unevenness of the flue gas speed, reduce the ammonia slip rate and the NO_x concentration and improve the denitration efficiency. Based on the test case study, it is recommended that for the SCR equipments in coal-fired power plants, flow field design should be optimized before commissioning and regulation test should also be conducted periodically after commissioning.

Key words: NO_x, SCR denitration equipment, ammonia slip, flue gas speed, optimization