SCR flue gas denitrification double-fluid heating spray gun system of coal-fired boiler

The utility model discloses a coal-fired boiler SCR flue gas denitration double-fluid heating spray gun system which comprises a boiler high-temperature economizer rear flue, and a double-fluid spraygun gas source pipeline penetrates through the position between the flue and a flue heat preservation layer in the horizontal section direction of the boiler high-temperature economizer rear flue. Laying and mounting around a boiler high-temperature economizer rear flue by 3/4 circle; a double-fluid spray gun ammonia water pipeline is laid and mounted around the flue by 3/4 circle in the horizontal section direction of the boiler high-temperature economizer rear flue; a plurality of double-fluid spray guns are arranged on the front wall and the rear wall of a rear flue of the boiler high-temperature economizer in the horizontal direction in a cross hedging mode. The SCR flue gas denitrification double-fluid heating spray gun system of the coal-fired boiler solves the problems of low denitrification efficiency, hig