The utility model discloses a gasifier annulus blows scavenging arrangement, include that the high pressure that connects gradually through the pipeline blows scavenging arrangement, first -class gauge, first governing valve, first check valve and first back hand valve, first back hand valve divide into two the tunnel, connects the gasifier superheat section all the way, and another way is connected with the third check valve and sets up in the distributor of gasifier shell body outer wall, the distributor is connected with the first temperature meter and third governing valve, it is sealed that gasifier cinder notch below balance pipe bottom is connected to the third governing valve, the distributor sweeps pipeline connection with the gasifier annulus, the high pressure blows the scavenging arrangement and is connected with coal nozzle and nozzle shroud ring crack blow line. The utility model discloses can avoid the corruption of expansion joint department and the nozzle cover department high temperature of coal nozzle overheated, be applicable to the shell gasifier.