Device for preventing slag of pulverized coal gasification waste heat boiler from hanging on wall

The utility model discloses a device for preventing slag of a pulverized coal gasification waste heat boiler from hanging on a wall. The device is composed of a porous annular high-pressure steam injection pipe, a fixing support, a fixing clamp, a high-pressure steam conveying pipe I, a steam adjusting valve I, a high-pressure steam conveying pipe II and a steam adjusting valve II. According to the utility model, a negative pressure zone is formed near a high-pressure high-speed steam jet flow ejected by the porous annular high-pressure steam injection pipe, and when the mixture of synthesis gas and slag discharged from a slag opening of a gasification chamber approaches the negative pressure zone, the mixture can flow along the negative pressure zone and is blocked by the high-pressure annular steam jet flow to directly fall into a water bath; slag is prevented from splashing to the inner wall of the waste boiler water cooling grate, and the wall hanging phenomenon is prevented. The utility model has the cha