Water spraying and cooling system for fire grate type garbage incinerator and automatic control method thereof

The invention relates to the field of municipal domestic garbage incineration, and particularly relates to a water spraying and cooling system for a fire grate type garbage incinerator and an automatic control method thereof. The left and right side walls of an outlet of the incinerator and the left and right side walls of an inlet of a high-temperature superheater are provided with thermocouplesat the same time correspondingly, atomized water drops enter the incinerator to be mixed with flue gas for vaporization and heat absorption, so that the temperature of the flue gas of an outlet of a hearth is reduced; according to the temperature size of the real-time feedback, the opening degree signal of a regulating valve is given through the DCS logic operation, the water spraying flow of theinlet furnace is adjusted, and after the temperature of the flue gas is reduced to a safe setting value, a water conveying pump and a valve are immediately closed, the compressed air pushes an air cylinder piston, and a spray