During the operation of the sludge dewatering machine, the dewatering part mainly includes gravity dehydration and pressure dehydration. Gravity dewatering refers to the fact that the sludge with low solid content after screening is evenly distributed on the filter belt with a running speed of 1-7 m/min. With the operation of the filter belt, the large part of the sludge is gradually removed due to gravity. Partially free water. There is also a small amount of water for free gravity dewatering through the tiny mesh holes above the filter cloth itself.
Pressurized dewatering means that after gravity dewatering, the sludge gradually enters the filter belt, and is limited to the predetermined width of the sludge dewatering machine filter belt without side leakage and thickening of the sludge cake. At the same time, the sludge is gradually passed through a series of fixed-size rollers, and the pressure of the extruded sludge is successively increased to achieve the purpose of dewatering.
That is to say, during the operation of the sludge dewatering machine, the purpose of high-efficiency dehydration is achieved by gradually increasing the sludge pressing force.
The sludge with high efficiency dewatering in the high pressure shear zone, with appropriate pressure gradient changes to reduce the moisture content of the mud cake.
The resulting sludge is forced to completely discharge a small amount of water remaining in the mud cake by means of a high-pressure shear zone to obtain a mud cake having a lower water content.