High-water-content filter material filter pressing device

Abstract

The utility model discloses a high-water-content filter material filter pressing device which comprises a squaring adjusting tank, a plate-and-frame filter press, a plate-and-frame feeding centrifugal pump, an air compressor, a squeezing water tank, a recycling tank and a filter residue conveying belt, and a discharging port of the squaring adjusting tank is connected with a plate-and-frame feeding port of the plate-and-frame filter press through a plate-and-frame feeding pipe; a feeding hole of the squaring regulating tank is connected with a squaring wastewater pipeline, and a reflux inlet of the squaring regulating tank is connected with a plate frame feeding pipe; a plate-and-frame squeezing opening of the plate-and-frame filter press is connected with a backwater inlet of the squeezing water tank, and a water outlet of the squeezing water tank is connected with the plate-and-frame squeezing opening of the plate-and-frame filter press; and the plate frame feeding centrifugal pump is arranged on the plate frame feeding pipe. According to the utility model, pumping is carried out on the plate-and-frame filter press through the plate-and-frame feeding centrifugal pump, so that the characteristics of high moisture content of the photovoltaic single crystal wastewater and large flow of the photovoltaic single crystal wastewater can be met, and the equipment investment and construction cost is reduced.

Description

Technical Field

[0001] The utility model relates to a filter pressure treatment device for photovoltaic single crystal wastewater, belonging to the technical field of wastewater resource utilization. Background Art

[0002] In the photovoltaic single crystal wastewater treatment project, there is a part of machine wastewater. After the water passes through the plate and frame filter press, it is discharged to the reuse water pool and then lifted to the water points of each production workshop by the reuse pump. The specific process is as follows Figure 1 shown.

[0003] The mud treatment process of the plate and frame filter press is mainly completed by the following steps: the first step - the pressing step. Under the action of the plate and frame electrical control system, the pressing step of the plate and frame filter press is completed by the oil cylinder, oil pump and hydraulic components. When the system is pressed at the hydraulic station and the oil cylinder, the filter chamber composed of each filter plate is sealed to prepare for filtration; the second step - the feeding step (filtration). Under the pressure of the feed pump, the filter material is fed into the filter chamber composed of the filter plates through the plate and frame feed port. Each filter plate is wrapped with a layer of filter cloth, and a filter chamber is formed between the filter cloths of two adjacent filter plates. After the plate and frame are pressed, each filter chamber becomes a closed space. After the sludge enters the filter chamber, the solid particles form filter residue on the filter cloth until it slowly fills the filter chamber to form a filter cake. The water molecules in the filter material pass through the filter The small holes on the cloth are gathered to the plate and frame filtrate discharge port for discharge; the third step - the squeezing step, by sending high-pressure squeezing water into the plate and frame diaphragm plate, the inner cavity of each diaphragm plate is a closed cavity. The volume of the diaphragm plate is expanded to a certain extent under the action of high-pressure squeezing water, which makes the chambers of each filter chamber relatively smaller, completing the re-squeezing of the filter cake, so that the moisture remaining in the filter cake is further reduced, and the filtrate is discharged outside the machine; the fourth step - the backflush step, uses high-pressure compressed air to blow the sludge in the middle hole of the filter plate formed after the filter plate is compressed back to the sludge pool; the fourth step - the loosening step, contrary to the pressing step, when the system loosens the hydraulic station and the oil cylinder, the filter plates are loosened to facilitate mud unloading; the fifth step - the mud unloading step, through the plate taking and plate pulling steps, the filter cakes on each filter plate are unloaded one by one.

[0004] The feed pumps commonly used for plate and frame systems are screw pumps and pneumatic diaphragm pumps. The advantages of screw pumps are: 1) they can transport high-viscosity liquids; 2) they provide high head, making them particularly suitable for lifting high-mud-content sludge-water mixtures from sludge thickening tanks to plate and frame processes. Because screw pumps are positive displacement pumps, they are suitable for frequency converter control, with flow rate proportional to frequency. Regardless of whether the plate and frame is just beginning or nearing the end of feed, the screw pump automatically adjusts its operating frequency based on the sludge pressure, ensuring constant pressure feed for the plate and frame. However, the disadvantages of screw pumps are that they are expensive for high-flow applications, and their screw length requirements require a large footprint. Overall, they are suitable for projects with relatively low flow rates and no specific footprint requirements. They are generally used in processes where the medium is high in sludge after sedimentation or concentration.

[0005] The advantage of a pneumatic diaphragm pump is that it automatically adapts to the plate and frame feed pressure and can operate dry without damage. Powered by compressed air, a pneumatic diaphragm pump operates at a higher frequency when the plate and frame are just being fed. As the plate and frame fill up, the pump operates at a lower frequency. Ultimately, the pump automatically maintains a balance between the air source pressure controlling the pump and the feed pressure. If the pressures become equal, the pump will stop operating. A disadvantage of a pneumatic diaphragm pump is its limited flow rate. When high flow rates are required for mud feeding, pneumatic diaphragm pumps are not suitable. Utility Model Content

[0006] Purpose of the utility model: In order to solve the problem that photovoltaic single crystal wastewater has a large flow rate and a high water content, which leads to high cost of the existing filter press device, the utility model provides a high-water content filter media filter press device.

[0007] Technical solution: To achieve the above purpose, the technical solution adopted by this utility model is:

[0008] A high-water content filter media filter press device, comprising a square regulating tank, a plate-frame filter press, a plate-frame feed centrifugal pump, an air compressor, a squeeze water tank, a reuse tank, and a filter residue conveyor belt, wherein the discharge port of the square regulating tank is connected to the plate-frame feed port of the plate-frame filter press through a plate-frame feed pipe, the feed port of the square regulating tank is connected to the square wastewater pipeline, and the reflux port of the square regulating tank is connected to the plate-frame feed pipe through a reflux pipeline; the plate-frame pressing port of the plate-frame filter press is connected to the plate-frame pressing port of the plate-frame filter press. The over-pressing return water pipe is connected to the return water inlet of the squeeze water tank, and the water outlet of the squeeze water tank is connected to the plate and frame squeezing port of the plate and frame filter press through the squeeze water pipe; the filter residue conveyor belt is located below the filter residue discharge port of the plate and frame filter press; the plate and frame water outlet of the plate and frame filter press is connected to the water inlet of the reuse pool through the plate and frame water outlet pipe; the air compressor is connected to the air inlet of the plate and frame filter press through the air pipe; the plate and frame feed centrifugal pump is arranged on the plate and frame feed pipe.

[0009] Preferably, it comprises a centrifugal pump frequency converter and a frequency converter control unit, wherein the centrifugal pump frequency converter is connected to the plate frame feeding centrifugal pump, and the frequency converter control unit is provided with the centrifugal pump frequency converter and is connected to the plate frame control unit.

[0010] Preferably, the plate frame feed pipe is provided with a feed valve, a feed pressure sensor, and a feed pressure gauge, and the feed valve and the feed pressure sensor are connected to the plate frame control unit.

[0011] Preferably, a reflux valve is provided on the reflux pipeline, and the reflux valve is connected to the plate frame control unit.

[0012] Preferably, a square root regulating level meter is provided on the square root regulating tank, and the square root regulating level meter is connected to the plate and frame control unit.

[0013] Preferably, a back-blow valve is provided on the air pipe, and the back-blow valve is connected to the plate frame control unit.

[0014] Preferably, the board frame control unit is a PLC controller.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The utility model is provided with a square regulating tank, a plate and frame filter press, a plate and frame feed centrifugal pump, an air compressor, a squeeze water tank, a reuse tank, and a filter residue conveyor belt, and the plate and frame filter press is pumped into the plate and frame feed centrifugal pump. Therefore, it can not only meet the characteristics of high water content and large flow rate of photovoltaic single crystal wastewater, but also reduce construction costs and equipment prices. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the photovoltaic single crystal wastewater treatment process.

[0018] Figure 2 It is a structural schematic diagram of a filter press device for filter media with high moisture content. DETAILED DESCRIPTION

[0019] The present invention is further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention made by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0020] Photovoltaic single crystal wastewater treatment process Figure 1 As shown, there is a part of machine-added wastewater in the photovoltaic single crystal wastewater treatment project. After the incoming water passes through the plate and frame filter press 2, it is discharged to the reuse water pool and then lifted to the water points of each production workshop by the reuse pump.

[0021] The wastewater from the processing plant has the following characteristics: a large volume of nearly 26,000 tons per day; a high moisture content, with a silica fume concentration of approximately 500 mg / L, equivalent to a moisture content of around 99.95%. This means that the medium lifted by the feed pump is mostly water, with silica fume accounting for a very small proportion. A screw pump would be inappropriate for this application. The reason: the medium's low viscosity undermines the advantages of a screw pump; high-flow, high-lift screw pumps are expensive, significantly increasing equipment investment costs; and high-flow, high-lift screw pumps require a large footprint. Therefore, using a screw pump would require a larger pump room, increasing Party A's civil engineering investment and land costs.

[0022] Because the amount of wastewater from the prescription is very large, the pneumatic diaphragm pump is not suitable. For this reason, this embodiment provides a high water content filter press device, such as Figure 2As shown, the filter press comprises a square opening regulating tank 1, a plate and frame filter press 2, a plate and frame feed centrifugal pump 3, an air compressor 4, a squeeze water tank 5, a recycling tank 6, and a filter residue conveyor belt 7. The square opening regulating tank 1 is provided with a square opening regulating liquid level meter 14, which is connected to the plate and frame control unit 9. The square opening regulating liquid level meter 14 monitors the liquid level of the square opening regulating tank 1 in real time.

[0023] like Figure 2 As shown, it includes a centrifugal pump inverter 31 and a inverter control unit 8. The centrifugal pump inverter 31 is connected to the plate frame feeding centrifugal pump 3. The centrifugal pump inverter 31 is set in the inverter control unit 8 and is connected to the plate frame control unit 9.

[0024] The discharge port 12 of the open-type regulating tank 1 is connected to the plate-frame feed port 21 of the plate-frame filter press 2 via a plate-frame feed pipe 210. The feed port 11 of the open-type regulating tank 1 is connected to the open-type wastewater pipeline 15. The return port 13 of the open-type regulating tank 1 is connected to the plate-frame feed pipe 210 via a return pipe 110. The return pipe 110 is provided with a return valve 111, which is connected to the plate-frame control unit 9. The plate-frame feed pipe 210 is provided with a feed valve 211, a feed pressure sensor 212, and a feed pressure gauge 213. The feed valve 211 and feed pressure sensor 212 are connected to the plate-frame control unit 9. The plate-frame feed centrifugal pump 3 is provided on the plate-frame feed pipe 210. A high-lift centrifugal pump is selected for the plate-frame feed centrifugal pump 3. Centrifugal pumps are suitable for use in situations where the water content of the medium is very high. Therefore, as long as the centrifugal pump has a high head and can maintain the feed pressure, it will be sufficient. The plate-frame feed centrifugal pump 3 pumps the wastewater from the square-opening regulating tank 1 into the plate-frame feed port 21 of the plate-frame filter press 2. The pumping pressure of the plate-frame feed centrifugal pump 3 is monitored by the feed pressure gauge 213, and the feed pressure is monitored in real time by the feed pressure gauge 213.

[0025] The plate-frame pressing port 22 of the plate-frame filter press 2 is connected to the return water inlet of the press water tank 5 via a press return water pipe 220, and the water outlet of the press water tank 5 is connected to the plate-frame pressing port 22 of the plate-frame filter press 2 via a press water pipe 230. The filter residue conveyor belt 7 is located below the filter residue discharge port of the plate-frame filter press 2 and conveys the filter residue produced by the plate-frame filter press 2 out via the filter residue conveyor belt 7. The plate-frame water outlet 23 of the plate-frame filter press 2 is connected to the water inlet of the reuse tank 6 via a plate-frame water outlet pipe 240. The air compressor 4 is connected to the air inlet 24 of the plate-frame filter press 2 via an air pipe 250. The air pipe 250 is provided with a backflush valve 251, which is connected to the plate-frame control unit 9. The plate-frame filter press 2 is pressurized by the air compressor 4.

[0026] The inverter control unit 8 and the plate and frame control unit 9 utilize PLC controllers, which offer a high degree of automation. This PLC controls the lift of the plate and frame feed centrifugal pump 3 to meet diverse photovoltaic single crystal wastewater treatment conditions. In the pre-filtering stage, the plate and frame feed centrifugal pump 3 is controlled to operate at a low frequency and low speed to meet low lift conditions and avoid overcurrent failures in the feed pump motor. In the mid-filtering stage, the operating frequency of the plate and frame feed centrifugal pump 3 is increased to meet higher lift pressure conditions. In the post-filtering stage, the operating frequency of the plate and frame feed centrifugal pump 3 is further increased to meet the target pressure and maintain constant feed pressure. Therefore, if the plate and frame filter media has a high moisture content, a high-lift centrifugal pump can be selected as the plate and frame feed pump. Since the plate and frame are loads with variable lift conditions, the inverter control unit 8 controls the lift of the plate and frame feed centrifugal pump 3, allowing it to meet diverse operating conditions. For projects, this achieves the same results while significantly reducing investment costs. (For example, a centrifugal pump with a head of 70 meters and a flow rate of 250 tons / hour costs about RMB 63,000 per unit, while a screw pump costs about RMB 550,000 per unit.)

[0027] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A filter press device for filter media with high water content, characterized by: The invention comprises a square regulating tank (1), a plate-frame filter press (2), a plate-frame feed centrifugal pump (3), an air compressor (4), a squeeze water tank (5), a recycling tank (6), and a filter residue conveyor belt (7). The discharge port (12) of the square regulating tank (1) is connected to the plate-frame feed port (21) of the plate-frame filter press (2) through a plate-frame feed pipe (210), the feed port (11) of the square regulating tank (1) is connected to the square wastewater pipeline (15), the return port (13) of the square regulating tank (1) is connected to the plate-frame feed pipe (210) through a return pipe (110); the plate-frame squeeze port (22) of the plate-frame filter press (2) is connected to the plate-frame squeeze port (22) through a press The squeeze return water pipe (220) is connected to the return water inlet of the squeeze water box (5), and the water outlet of the squeeze water box (5) is connected to the plate-frame squeeze port (22) of the plate-frame filter press (2) through the squeeze water pipe (230); the filter residue conveyor belt (7) is located below the filter residue discharge port of the plate-frame filter press (2); the plate-frame water outlet (23) of the plate-frame filter press (2) is connected to the water inlet of the reuse tank (6) through the plate-frame water outlet pipe (240); the air compressor (4) is connected to the air inlet (24) of the plate-frame filter press (2) through the air pipe (250); and the plate-frame feed centrifugal pump (3) is arranged on the plate-frame feed pipe (210).

2. The high-water content filter press device according to claim 1, characterized in that: It comprises a centrifugal pump frequency converter (31) and a frequency converter control unit (8), wherein the centrifugal pump frequency converter (31) is connected to the plate frame feeding centrifugal pump (3), and the frequency converter control unit (8) is provided with the centrifugal pump frequency converter (31) and is connected to the plate frame control unit (9).

3. The high-water content filter press device according to claim 2, characterized in that: The plate frame feed pipe (210) is provided with a feed valve (211), a feed pressure sensor (212), and a feed pressure gauge (213). The feed valve (211) and the feed pressure sensor (212) are connected to the plate frame control unit (9).

4. The high-water content filter press device according to claim 3, characterized in that: A reflux valve (111) is provided on the reflux pipe (110), and the reflux valve (111) is connected to the plate frame control unit (9).

5. The high-water content filter press device according to claim 4, characterized in that: The square root regulating tank (1) is provided with a square root regulating level meter (14), and the square root regulating level meter (14) is connected to the plate frame control unit (9).

6. The high-water content filter press device according to claim 5, characterized in that: The air pipe (250) is provided with a back-blowing valve (251), and the back-blowing valve (251) is connected to the plate frame control unit (9).

7. The high-water content filter press device according to claim 6, characterized in that: The plate frame control unit (9) is a PLC controller.

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