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Filter Press Dehydration Application

The pressure filter utilizes a special filter medium to exert certain pressure on the object, which makes the liquid dialysis out of a mechanical equipment, which is a commonly used solid-liquid separation equipment. Applied to chemical production in the early 18th century, it is still widely used in chemical, pharmaceutical, metallurgy, dye, food, brewing, ceramics and environmental protection industries. The filter plate has stable performance, convenient operation, safety and saving power. The metal drum is made of seamless steel tube and plastic strainer. It is high temperature, high pressure and durable.

The structure of filter press is composed of three parts:

rack

The frame is the basic part of the filter press, the ends are the thrust plate and the pressing head, and the two sides of the girder will connect the two together, the girder is used to support the filter plate, the filter box and the compression plate. In order to meet the higher health needs, the frame needs to be covered with stainless steel. The stainless steel technology can be used for reference, and its quality can meet the needs of European customers.

A and thrust plate: it is connected with the support to the end of the press filter on the foundation. The thrust plate of the air filter press is in the middle of the feed

Holes, four corners and four holes, the two corners of the hole are washing liquid or compressed gas inlet, and the next two angles are outlet (undercurrent structure or filtrate outlet).

B. Pressure plate: to press the filter box tightly, the roller on both sides is used to support the compression plate to roll in the rail of the girder.

C. Girder: it is a load-bearing component. According to the requirements of environmental corrosion protection, rigid polyvinyl chloride, polypropylene, stainless steel coating or new anticorrosive coating can be selected.

Compaction mechanism

Manual pressure, mechanical pressure, hydraulic pressure.

A, manual compaction: the press plate is pressed tightly with A screw type mechanical jack.

B, mechanical compaction: the pressure mechanism is driven by the motor (equipped with advanced overload protector), gear payment, wire rod and fixation

Nuts are made of nuts. When pressed, the motor is turning, driving the reducer and gear, so that the silk rod is rotated in the fixed silk mother, pushing the press plate and the filter press tightly. When the pressure force is more and more big, the motor load current increases, when the big to protector set current value, maximum clamping force, motor to cut off the power supply, stop running, because of the wire rod and the fixed wire mother have reliable self-locking spiral Angle, can reliably guarantee the state of compression in the process of work, to return, motor reversal, when the weight for the hold-down plate, contact to switch back to stop.

C, hydraulic pressure: the composition of hydraulic pressure actuating mechanism consists of hydraulic station, oil cylinder, piston, piston rod and piston rod and pressure plate

The structure of the hydraulic station of the havelan card is composed of: motor, oil pump, overflow valve (regulating pressure) reversing valve, pressure gauge, oil circuit and fuel tank. Hydraulic pressure mechanical compaction, the hydraulic station for the high pressure oil, oil cylinder and a piston component cavity filled with oil, when the pressure is greater than the pressure plate running friction resistance, pressure plate slow pressure filter plate, when the pressure force to achieve the relief valve set pressure value (by pressure gauge pointer display), filter plate, filter box (plate and frame type) or filter plate (van) is compact and started unloading overflow valve, at this time, to cut off the motor power, compaction action is complete, return, reversing reversing valve, pressure oil into the cylinder rod cavity, when the hydraulic pressure plate can be overcome frictional resistance, pressure plate began to return. Automatic pressure for hydraulic pressure, clamp force is controlled by the electric contact pressure gauge, the gauge of the pointer and UCLA's pointer to set the value of process requirement, when the pressure force reaches a pressure gauge highs, power cut, the oil pump to stop the power supply, oil system due to the possible leakage and leakage cause the loss of compression force, when the lower limit to the pressure gauge pointer, electricity, oil pump start fuel supply, the pressure to reach highs, power cut, oil pump fuel cut-off, such circulation filter materials in the process of guarantee in order to achieve the effect of clamping force.

Filtering mechanism

The filter mechanism consists of filter plate, filter frame, filter cloth and press diaphragm. The filter board is covered by filter cloth, and the filter plate is made up of diaphragm plate and side plate when pressing the diaphragm. The substrate of the diaphragm plate is covered with a rubber diaphragm, the diaphragm is covered with a filter cloth, and the side plate is the ordinary filter plate. Material from the thrust plate hole into each filter chamber, solid particles because of its particle size is greater than the pore diameter of filter medium (cloth) trapped in the filter chamber, the filtrate from filter plate at the bottom of the hole of produced liquid flow out. When the filter cake needs to be pressed dry, it can also be used to compress air or steam, which can be used to reduce the moisture content of the cake.

(1) filtering mode

The filtrate outflow is filtered and filtered.

A, light flow filtration: water nozzle is installed on the lower part of each filter plate and the filtrate is directly out of the water nozzle.

B. Dark flow filtration: a liquid channel hole is provided below each filter plate and the outlet of a number of filter plates is connected to an outlet

A pipe that is connected by a fluid hole below the thrust plate is expelled.

(2) washing method

When the filter cake needs to be washed, it has one-way washing and two-way washing, dark flow one-way washing and two-way washing.

Is A unidirectional washing, Ming flow, lotion from lotion into the hole in turn into the thrust plate, wear filter cloth and filter cake, from the hole filter plate, then perforated plate produced liquid water mouth closed, no orifice of produced liquid water nozzle is open.

B, Ming is bi-directional flow washing lotion from both sides of the thrust plate above the lotion into the hole has two times of washing, namely lotion from the side of washing first, then from the other side of the washing, wash the exports and imports are diagonal direction, so also called two-way cross washing.

C, the backflow one-way flow scrubber is the liquid of the lotion from the hydraulic feed hole of the thrust plate into the perforated plate, through the filter cloth and filter cake, from the perforated filter plate.

D, the undercurrent is two-way washing lotion from check two lotion into the hole on either side of the plate at the top of the washing twice, namely washing from the side of washing first, then on the other side of washing, the export of lotion is diagonal direction, so also called undercurrent two-way cross washing.

(3) filter cloth, filter cloth is a kind of main filter medium, the selection of filter cloth and use, has a decisive effect to filtering effect, choose according to the filter material when PH value, such factors as the solid particle size to choose the appropriate filter cloth filter material and aperture to ensure low cost and high filtration efficiency, when using, to ensure that the filter cloth level not discounted, aperture open

Dehydration application

1. As a mature dehydration device, filter press is widely used in environmental protection and becomes an important equipment for sewage sludge treatment.

2: the dehydration of the sludge is mainly to remove the capillary water between the sludge particles. The water content of the sludge is often 65% to 80% after the dehydration of the normal machine.

3: mechanical dewatering equipment used to mainly include belt filter press, plate frame filter press and horizontal screw settling centrifuge. Now, it is used to use the vane filter press, vertical hydraulic filter press, diaphragm machine and high pressure plate frame machine.

4. Sludge dewatering can greatly reduce the accumulation of sludge and the cost of transportation during landfill. During composting of sludge, the sludge dehydration can guarantee the smooth composting of compost. (the sludge has lower moisture content during composting process); If sludge incineration, centralized treatment, sludge dehydration rate can greatly reduce the thermal energy consumption, and reduce the cost of hazardous materials.

5: however, the sludge composition is complex, relatively dense and relatively small, and it is usually colloidal, which determines the characteristics of its not easy to dehydrate, so far so far. In addition to the ultra-high pressure vertical hydraulic pressure filter, the rest of the filter press increases drying process to reduce the residual oil (liquid) rate.

6: low power consumption of belt type pressure filter. The water rate of filter cake is low in plastic sheet box, but the centrifugal coning centrifuge is adaptable to the fluctuation of sludge flow, good airtight performance, large amount of treatment and small area. In the past, most sewage treatment plants in China adopt centrifuge, belt filter press and plate frame filter press. The commonly used vane filter press, diaphragm filter press, and ultra-high pressure vertical hydraulic filter press, its technology is unique, is the sludge dehydration ideal equipment.