Peak shaving system and method for coal-fired unit

The invention relates to the technical field of sludge drying, in particular to a peak shaving system and method for a coal-fired unit. The system comprises a sludge dryer, a coal-fired boiler, a steam turbine, a power generator, thermochemical energy storage equipment, a first heat exchanger, a second heat exchanger, a third heat exchanger, a first molten salt tank and a second molten salt tank, and the temperature of molten salt in the first molten salt tank is lower than that of molten salt in the second molten salt tank; sludge to be dried in the sludge dryer is dried through the thermochemical energy storage equipment, the first molten salt tank and the second molten salt tank, and peak regulation is carried out on the coal-fired unit through the thermochemical energy storage equipment, the first molten salt tank and the second molten salt tank. According to the scheme provided by the invention, the flexibility of the unit can be improved while sludge drying is realized. 本发明涉及污泥干化技术领域，特别涉及一种燃煤机组的调峰系统及方法。