Plate and frame filtering system and filtering method for reducing water content of sludge fine slag

The invention discloses a plate-and-frame filtering system for reducing the water content of sludge fine slag and a filtering method. The plate-and-frame filtering system comprises a plate-and-frame filter, a cyclic heating module, a material back-blowing module, a squeezing back-blowing module and a vacuum squeezing back-blowing module, the plate-and-frame filter comprises a plurality of squeezing plates and a plurality of heating plates, two adjacent squeezing plates and the heating plate clamped between the two squeezing plates form a filter frame cavity, and each plate is oppositely provided with a liquid inlet hole and a liquid outlet hole; a through hole is formed in an end plate and connected with a gas-liquid separation tank through a filtrate outlet pipe, and the top of the gas-liquid separation tank is connected with a vacuum pump through a pipeline. The hot water feeding main pipe is connected with the liquid inlet hole of each heating plate, and the hot water return pipe is connected with the liqu