Coal water slurry water-cooled wall gasification furnace in waste boiler process

The utility model discloses a coal water slurry water-cooled wall gasification furnace in a waste boiler process, which comprises a gasification furnace, a waste heat boiler and a guide pipe; the lower end of the gasification furnace and the lower end of the waste heat boiler are connected through the guide pipe in series to form a U-shaped structure; a gasification chamber is a membrane type straight pipe water-cooled wall or a spiral coil pipe water-cooled wall; a water-cooled wall inlet header is arranged at the bottom of the gasification chamber; a water-cooled wall outlet header is arranged on the top of the gasification chamber; a chiller is arranged at the outlet of a downcomer; one end of the guide pipe is arranged below the chiller; the other end of the guide pipe is arranged below an overheater; and an evaporated and heated surface is arranged above the overheater. According to the utility model, the overhaul cost is saved; the longer effective operation time can be ensured; deposited dust at the guide pipe can be effectively avoided; protective gas between a pressure shell and the gasification chamber is capable of ensuring the pressure shell to work at lower temperature; heat of the waste heat boiler and high-temperature synthesis gas is exchanged to generate medium-pressure saturated or overheated steam; heat, the coal calorific value of which is 10-13%, can be recycled; and the thermal efficiency of a system is effectively increased.