Ash dredging comprehensive utilization system for accumulated ash at bottom of horizontal flue of boiler

The utility model discloses an ash dredging comprehensive utilization system for accumulated ash at the bottom of a horizontal flue of a boiler. According to a pulverized coal boiler arranged in a pi shape, the smoke flow speed in a horizontal flue area is reduced, ash particles cannot be brought to a tail flue area, a large amount of ash is accumulated in the horizontal flue area, and normal heat exchange of a heating surface in the area is affected. The device comprises a wall enclosure smoke exhaust port pipe (1) connected with a water cooling wall extending bottom enclosure wall, a sealing box body device (2) is fixed outside a wall enclosure smoke exhaust port pipe panel, the bottom of the sealing box body device is connected with an upper ash falling pipe (4), the bottom of the upper ash falling pipe is connected with a hanging water cooling pipe bundle (8), and the hanging water cooling pipe bundle (8) is connected with the wall enclosure smoke exhaust port pipe panel. The water cooling pipe bundle (8)