Pneumatic slag discharging, circulation preheating and dust preventing device for boiler

The utility model relates to a boiler combustion slag discharging device, in particular to a pneumatic slag discharging, circulation preheating and dust preventing device for a boiler to replace original manual slag discharging. The pneumatic slag discharging, circulation preheating and dust preventing device comprises a closed coal slag bin with the upper portion provided with a coal slag inlet. The upper portion of the coal slag inlet is provided with a pneumatic gage valve. The lower portion of the coal slag bin is provided with a coal slag outlet. The upper portion of the coal slag outlet is provided with a bottom pneumatic gate valve. An S-shaped metal water pipe is arranged in the coal slag bin. The coal slag bin is supported by a coal slag bin support. The upper portion of the coal slag bin is provided with an exhaust pipe provided with an exhaust ball valve. The pneumatic slag discharging, circulation preheating and dust preventing device is good in slag discharging safety, and labor intensity of work