On November 7, large coke fell off during soot blowing to L7 and R7 (rear part of high-temperature superheater) of ා 1 unit of changre power plant, which led to the trip of slag conveyor, deformation of scraper, failure of three hydraulic shut-off doors close to climbing section, and disconnection of oil pressure chain wheel of slag conveyor, which required emergency repair of slag carrier. As ා 1 unit is responsible for the important tasks of steam extraction and urban heating, the slag extractor shutdown for a long time will lead to the non-stop accident of ා 1 boiler.

        In order to repair the slag extractor urgently and avoid the non-stop operation of No.1 unit, Changji project company selects 13 boiler professional technicians to organize slag extractor repair team, and Qiao Peisheng, general manager of the project company, leads the repair team. In the face of complex maintenance site environment, unit load reduction, heating reduction and even forced shutdown and other possible situations, the slag extractor repair team overcame all difficulties, and after continuous 7 hours of hard work, the slag extractor was successfully repaired and the unit returned to normal operation.

       In case of emergency, the emergency repair work of slag extractor avoided an accident shutdown, which fully demonstrated the spirit of Wanneng people to face difficulties and not be afraid of hardship and fatigue.（Liu Yuanli ）