Abstract: The reasons of faults frequently occurred in the slag disposal system of the 670 MW boiler of Huadian Weifang Power Generation Company Limited were analyzed. The relevant reformation method was proposed. After the system had been reformed, the problem of frequent faults of slag disposal system were solved, the service live of the device was lengthened, the maintenance work was lightened, and favorable effects were obtained.

Key words: 670 MW boiler, slag disposal system, reason of fault, technical reformation