The laminated sludge dehydrator is mainly composed of metering tank, flocculation mixing tank, mixing device, dehydration main body, filtrate tank, motor, electric control cabinet and support. The water inlet and outlet on the equipment are all configured with flanges to facilitate on-site pipeline connection. Power saving, no blockage, small floor space, no vibration, no noise, low concentration sludge dewatering (≥ 2000mg / L), extremely low maintenance frequency and 24-hour continuous operation.
Structure and working principle
The stacked screw sludge dehydrator is composed of stacked screw body, driving device, filtrate tank, mixing system, frame body, etc. When the stacked screw sludge dehydrator works, the sludge is lifted to the mixing tank through the sludge pump. At this time, the dosing pump also quantitatively transmits the chemical solution to the mixing tank. The mixing motor drives the whole mixing system to fully mix the sludge and the chemical solution, resulting in alum. When the liquid level reaches the upper position of the liquid level sensor, the liquid level sensor receives a signal to make the main motor of the stacked screw work, so as to start pressure filtration of the sludge flowing into the stacked screw main body, Under the action of the screw shaft, the sludge is lifted to the sludge outlet step by step, and the filtrate flows out from the gap between the fixed ring and the swimming ring.
(1) Stacked spirochete
The stacked screw body is composed of fixed ring, traveling ring, spiral shaft, screw, gasket and several connecting plates. The whole stacked screw body is made of stainless steel 304. The fixed ring is connected together through six screws. Gasket and traveling ring are installed between the fixed rings. Both the fixed ring and traveling ring are made of wear-resistant materials, so that the service life of the whole machine is long. The spiral shaft passes through the middle of the fixed ring and traveling ring, And the floating ring is sleeved on the spiral shaft.
The main body is a filtering device formed by multiple fixed rings and swimming rings, through which a spiral shaft passes. The front section is the concentration section and the rear section is the dehydration section, which completes the sludge concentration and pressing dehydration in one barrel, replacing the traditional filter cloth and centrifugal filtration mode with a unique and subtle filter body mode. After gravity concentration in the concentration section, the sludge is transported to the dehydration section. In the process of moving forward, with the gradual reduction of filter joint and pitch and the blocking effect of back pressure plate, great internal pressure is generated, and the volume is continuously reduced to achieve the purpose of full dehydration.
(2) Spiral shaft
The spiral shaft is composed of taper shaft and spiral blade.
Firstly, the spiral blade is cut by laser, and the taper shaft is roughly processed after pouring and forming, and then the spiral blade and the taper shaft are welded by full welding. According to the working condition of the screw stacking sludge dehydrator, the outer circle of the spiral shaft blade is in direct contact with the traveling ring, resulting in friction, and the blade surface is always in contact with the sludge, resulting in some wear. Therefore, The treatment process adopted by our company is: hard material surfacing is applied to the outer circle of the spiral blade, then thermal spraying is applied to the surface of the whole shaft, and then grinding is applied to the outer circle of the spiral blade,. And finish turning the shafts at both ends to ensure the coaxiality and surface finish of the two shafts.
(3) Driving device
The driving device is the power source of the equipment, and the performance of the driving device will directly affect the performance of the whole machine. Therefore, our company selects domestic brands of motor and reducer with superior performance. The protection grade of the motor is IP54 and the insulation grade is f. Explosion proof motors can also be used according to customer requirements, and frequency conversion starting and speed regulation methods can be adopted to adapt to different application conditions and avoid the impact of load.
(4) Filtrate tank
The filtrate tank is welded by stainless steel 304 plates to collect the filtrate filtered by the main body of the screw stack. The periphery of the filtrate tank is connected with the frame body through screws, and a flange is set on the side of the filtrate tank to connect with external equipment.
(5) Hybrid system
It is mainly used to mix the sludge with the main body to form alum for dehydration. The mixing tank is provided with a mud inlet, an overflow port and a vent, and a liquid level regulating device, so that the feed rate of sludge can be adjusted.
(6) Frame body
The frame body is welded by high-strength channel steel, and the surface is treated with anti-corrosion treatment. The overall welding effect is good and the rigidity is good.
The sludge pump pumps the sludge into the mixing tank - the sludge enters the main body of the screw stacker for concentration and dehydration - the sludge is discharged at the pressing plate after being pressed by the screw. Sludge dewatering stage has two parts, one is sludge thickening and the other is sludge dewatering. The first section of the screw stacker body is the sludge thickening section. The pitch of the sludge thickening section is relatively large. The higher the pitch is, the smaller the pitch will be and the greater the pressure will be. Under the continuous mutual movement and extrusion of the moving ring and the fixed ring, the sludge is discharged through the obstruction of the pressing plate.
- It is suitable for dehydration of high and low concentration sludge. When dewatering low concentration (2000mg / L ~) sludge, there is no need to build concentration tank and storage tank, so as to reduce the construction cost, reduce the release of phosphorus and the generation of anaerobic odor. (high concentration sludge must have fluidity)
- No blockage, reduce flushing water consumption, save water cost and reduce the burden of internal circulation caused by the backflow of cleaning water.
- The electric control cabinet, flocculation mixing tank and dehydration main body are integrated, which reduces the floor area and is simple and convenient to install.
- The dehydrator is basically in closed operation, and the treatment is stable and timely, so as to reduce the on-site odor to an ideal level and improve the working environment of workers.
- Realize full-automatic 24-hour operation and reduce the labor intensity of operators.
- The running speed of spiral shaft is low, 2-3 revolutions per minute, low power consumption, and there is no vibration and noise on site.
- The body is made of stainless steel, which can greatly prolong the service life. Only the spiral shaft and traveling ring are replaced, which has a long service life.
- The daily maintenance time is short and the maintenance operation is simple.
Users can reasonably select the working parameters of the equipment according to the physical properties of the separated material (suspension), separation requirements, treatment capacity, process requirements and other factors, so as to obtain satisfactory separation effect and economic benefits. Colors and materials can be customized.
Sludge treatment capacity