Decomposition furnace dispersing system capable of preventing internal crust

The utility model discloses a decomposing furnace dispersing system capable of preventing internal skinning, and relates to the field of decomposing furnace auxiliary devices. The preheating device comprises a preheating furnace of the dispersing furnace, a feed port of the preheating furnace is arranged on the side wall of the preheating furnace, a guide plate inclining downwards is mounted on the inner wall of the preheating furnace, the top end of the top surface of the guide plate is communicated with the bottom surface of the feed port, and an included angle formed by the guide plate and the horizontal plane is 15-25 degrees. The distance between the end of the material guide plate and the inner wall of the preheating furnace is 150-200 mm, through holes are distributed in the material guide plate, and the end of the material guide plate is of a flat head structure. The problems that local high temperature is generated at the connecting part of the conical part and the straight barrel of the decomposing