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Principle analysis of stacked screw sludge dewatering machine
- 2018-12-03-

Stacked screw sludge dewatering machineThe method is a screw press dehydrator, which can reduce the sedimentation tank and sludge thickening tank and save the construction cost of the sewage station. The stacked screw sludge dewatering machine cleverly uses the automatic renewal filter cake filtration technology to replace the traditional filter sieve filtration, and its own renewal of the filter cake filtration technology ensures the continuous and stable mud-water separation effect of the dewatering machine, and the strong extrusion force generated by the change of screw diameter and pitch , And the tiny gap between the moving ring and the fixed ring, to realize the squeezing and dewatering of the sludge. It is a new type of solid-liquid separation equipment.

principle:

1. Concentration: When the screw pushing shaft rotates, the multiple solid and living laminations arranged on the periphery of the pushing shaft move relative to each other. Under the action of gravity, water is filtered out from the gap of the relatively moving laminations to realize kuai rapid concentration.
2. Dehydration: The concentrated sludge moves forward with the rotation of the screw shaft; along the direction of the mud cake outlet, the pitch of the screw shaft gradually decreases, and the gap between the rings gradually decreases, and the volume of the spiral cavity Continuously shrinking; under the action of the back pressure plate at the outlet, the internal pressure gradually increases. Under the continuous continuous operation of the screw drive shaft, the water in the sludge is squeezed and discharged, and the solid content of the filter cake continues to increase to realize the sludge Continuous dehydration.
3. Self-cleaning: The rotation of the screw shaft pushes the moving ring to continuously rotate. The equipment relies on the movement between the fixed ring and the moving ring to achieve a continuous self-cleaning process, thereby cleverly avoiding the common blocking problem of traditional dehydrators.

work process:

1 Through the flocculation test, determine the matching flocculant type and dosage ratio

2Through the sludge transfer pump, the sludge is transported to the sludge transfer port

3 The sludge is transported to the flocculation mixing tank after adjusting the flow through the metering tank, and is fully mixed by stirring

4 After being fully stirred by a mixer to form a larger alum, it is sent into the main body of the snail

5 Alum flowers are concentrated by gravity in the concentration section, and a large amount of filtrate is removed from the filter slit of the concentration section. The filtrate in the thickening section has low solid content and is directly returned to the original pool.

6 The concentrated sludge advances forward along the spiral axis, and is fully dehydrated in the dehydration section under the action of various combined forces. The filtrate in the dehydration section has a relatively high solid content and can be returned to the flocculation mixing tank for dehydration again.

7 The gap between the moving ring and the fixed ring of the dehydration section becomes narrow, and the back pressure plate at the discharge port is adjusted to further pressurize the dehydration to discharge the mud cake.

Dehydration operation process:

The sludge in the sludge tank transports mercury through the sludge and is transported to the metering tank. The sewage tank has no return pipe, and the excess sludge flows back to the sludge pond through the return pipe.

The sludge and flocculant are fully mixed in the flocculation mixing tank by a mixer to form alum. The ideal diameter of the flowers is about 5 mm.

Gonghua is concentrated by gravity in the concentration section, and a large amount of filtrate is discharged from the filter slot of the concentration section, and the filtrate is sent back to the original pool or adjustment tank. The concentrated sludge continues to advance along the rotating direction of the screw shaft, and is fully dehydrated under the internal pressure formed by the back pressure plate.

The dehydrated mud cake is discharged from the gap formed by the back pressure plate and the main body of the stacked screw. The sludge treatment capacity and the moisture content of the mud cake can be adjusted by adjusting the rotation speed of the screw shaft and the gap of the back pressure plate. The stacked screw sludge dewatering machine developed and produced by Dezhou Hongman Environmental Protection Technology Co., Ltd. is a screw-type press dewatering machine, which does not require a sedimentation tank and a sludge thickening tank, which can save the construction cost of the sewage station. The stacked screw sludge dewatering machine cleverly uses the automatic renewal filter cake filtration technology to replace the traditional filter sieve filtration, and its own renewal of the filter cake filtration technology ensures the continuous and stable mud-water separation effect of the dewatering machine, and the strong extrusion force generated by the change of screw diameter and pitch , And the tiny gap between the moving ring and the fixed ring, to realize the squeezing and dewatering of the sludge. It is a new type of solid-liquid separation equipment.