Method for repairing chilling ring of gasifier

The invention relates to a technique of repairing a chilling ring of a waste coal water slurry gasifier. The method for repairing the chilling ring of the gasifier comprises the steps that an original outer ring tube is cut down from the inner ring of a cavity base; lathe turning is carried out on a water outlet of a water distribution hole on the inner ring of the cavity base, impurities on the lathe turning surface are removed by abrasive blasting, a thickness removed by the lathe turning is made up by spray welding, and a new water distribution hole is drilled in the inner ring of the cavity base; impurities on washed parts of the outer surface of a water distribution inner ring are removed by the abrasive blasting, and an original size of the water distribution inner ring is recovered through processing and polishing after the spray welding; and a new outer ring tube is fabricated, the outer ring tube is cut into at least three sections which are butt jointed and positioned and fixed to the inner ring of the cavity base, and the outer ring tube is welded on the inner ring of the cavity base. The waste chilling ring is repaired, so an expensive fee for replacing a new chilling ring is saved, production cost of an enterprise is saved, and waste reutilization is realized.