Working steps of screw press sludge dewatering machine

The sludge after conditioning the rubber plume of the snail sludge dewatering machine is introduced into the fine screen of the screening and separating barrel, and is tumbling at a slow speed under the action of the centrifugal screening machine (rotation speed 30r.p.m., power 0.25KW/set) A large amount of supernatant liquid (free water) is filtered out to achieve the function of sludge concentration and weight reduction, improve the processing capacity of the machine, and shorten the operation and processing time.

Screening the separated sludge can greatly reduce the permeable load of the filter cloth. At this time, the structure of the mud mass is stable, and there is no overflow or side overflow of the flow, which improves the dehydration efficiency of the rear stage roller press and reduces the moisture content of the mud cake.

The sludge with low solid content screened out by the snail sludge dewatering machine is evenly distributed on the filter belt with a running speed of 1~7m/min. With the operation of the filter belt, most of it is gradually removed due to the action of gravity. free water. There is also a small part of water for free gravity dehydration through the tiny mesh holes on the filter cloth itself.

The sludge mass after gravity dehydration enters the filter press belt through the concave inlet throat, and it is limited to the predetermined width of the filter belt of the Qili environmental protection sludge dewatering machine without side leakage and thickening of the sludge cake. At the same time, let the sludge pass through a series of fixed-size rollers step by step, and the dehydration is achieved by gradually increasing the pressure of the squeezed sludge; the sludge that has been squeezed and dehydrated at the beginning enters a series of fixed-size main rollers and auxiliary rollers, through successively increasing Greater sludge extrusion force to achieve the purpose of dewatering; dewatered sludge in the high-pressure shear zone (the area where the pressure of the squeezed sludge is increased by the bearing angle arranged by the rollers) is reduced by appropriate pressure gradient changes. The moisture content of the cake. The sludge that comes out uses the high-pressure shear zone (the power is the pressure of the air compressor, which can be adjusted freely according to the actual needs of the operation), to force the little water remaining in the mud cake to completely discharge, so as to obtain a mud cake with a lower moisture content.

Utilize the reasonably distributed nozzles fixed on the closed device (the device is easy to maintain and clean, and there is no flushing water splashing out to wet the mud cake), and the pump (maximum water output 8M3/hr, head 45m, power 2.2KW) ) into the cleaning water from the nozzle to spray the water column (cleaning water pressure 4kg/cm2, total water demand 7m3/hr) to the upper and lower filter cloth for upper and lower spraying action, the sprayed water is 65. Fan-shaped, which is beneficial to reduce the pressure loss of water; the amount and speed of spraying water can be adjusted arbitrarily according to the actual requirements of the operation to remove the dirt remaining between the meshes of the filter cloth; and the water pressure cleaning can maintain the permeable function of the filter cloth and reduce the filter cloth. The moisture content of the cake increases the service life of the filter cloth and prevents side leakage due to serious blockage of the filter cloth of the Qili Environmental Protection Sludge Dewatering Machine. The cleaning device is equipped with a filtrate retention and receiving device, so that the filtrate can be recovered and treated as flushing water.

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