Abstract:

Ammonia desulfurization is of high desulfurization efficiency,and easy to operate.But it is has disadvantages such as ammonia escaping and(NH4)2SO4 aerosol forming.By analysis the removal efficiency on NOx,dust,NH3,droplets,SO3and other pollutants made by ammonia desulfurization system and wet electrostatic precipitator(WESP), their synergistic removal effect on typical pollutants above were systematically studied.The results show that the mass concentration of dust at the outlet of WESP is less than 10mg/m3，and 30%～40%NOx，90%SO3 and 80% droplets can be shrugged off, but only about 50% NH3 can be removed by the WESP and ammonia desulfurization system.Therefore,ultralow emission of dust and NOx can be achieved by WESPs and ammonia desulfurization systems,which has a significant effect on preventing aerosol forming caused by ammonia desulfurization.But their effect on ammonia escaping control still needs to be updated.

Key words: ammonia desulfurization, WESP, ammonia escaping, (NH4)2SO4 aerosol, ultralow emission, synergistic desulfurization