Ammonia spraying amount fine control device of denitration system

The utility model discloses a denitration system ammonia injection amount fine control device which comprises an ammonia water storage tank, a dilution water tank and a CEMS detector used for detecting NOx emission concentration, the ammonia water storage tank is connected with an ammonia water pneumatic control valve through an ammonia water delivery pump, and the ammonia water pneumatic control valve is connected with a mixer through an ammonia water flowmeter. The dilution water tank is connected with a dilution water pneumatic adjusting valve through a dilution water pump, the dilution water pneumatic adjusting valve is connected with a mixer through a dilution water flowmeter, the dilution water pump is connected with a dilution water conveying adjusting device, and the mixer is connected with spray guns through a plurality of manual ball valves. A spray gun flowmeter is mounted on each spray gun; according to the utility model, the accurate control of a denitration reducing agent is realized through mul