Ammonia spraying grating anti-blocking device for SCR denitration system

The invention provides an ammonia spraying grating anti-blocking device for an SCR denitration system. The ammonia spraying grating anti-blocking device for the SCR denitration system can effectively solve the problem of spraying port blocking and guarantee the effective and stable operation of the system. The ammonia spraying grating anti-blocking device for the SCR denitration system comprises a denitration reactor inlet flue, an SCR denitration reactor is connected with the denitration reactor inlet flue, an ammonia spraying grating is arranged in the denitration reactor inlet flue, and an ammonia storage tank is connected with the ammonia spraying grating through an ammonia evaporator and a mixer in sequence. The ammonia spraying grating anti-blocking device for the SCR denitration system is characterized in that an ammonia dilution fan is connected with the mixer through a heater.