A membrane filter press with reduced sludge moisture content

Abstract

The application relates to a diaphragm filter press with reduced sludge moisture content, which comprises a rack, a plurality of diaphragm plates, a plurality of distribution plates, a compression plate, a driving member, the compression plate is arranged on the rack, the diaphragm plates and the distribution plates are arranged on the rack in an interlaced mode, the driving member is used for moving the diaphragm plates and the distribution plates towards the compression plate and making the diaphragm plates abut against the distribution plates to form cavities, filter cloths are arranged on the diaphragm plates and the distribution plates, exhaust and drainage ports are arranged on the diaphragm plates and the distribution plates and are used for being communicated with the cavities, and a back blowing device for air drying and draining the filter cloths and the surfaces of sludge cakes is arranged on the compression plate. The application has the effect of reducing the moisture content of sludge after filter pressing.

Description

Technical Field

[0001] This application relates to the field of filter presses, and more particularly to a diaphragm filter press that reduces the moisture content of sludge. Background Technology

[0002] A filter press is a solid-liquid separation device used in wastewater treatment to press sludge for subsequent processing. Currently, conventional diaphragm box filter presses have a feed pressure of 0.8-1.2 MPa and a water pressing pressure of 1.0-1.6 MPa. The moisture content of the filter cake is generally between 60-70%.

[0003] During the operation of a filter press, as the sludge water enters the filter plates through the central feed inlet, it is observed that as the sludge cake thickens, the water in the newly entering sludge needs to be squeezed to pass through the filter cloth. The thicker the sludge cake, the greater the resistance, causing the filter press's output water to gradually decrease over time. Only when the water drips in a thin stream from the filter nozzle can the water pressing and sludge discharge begin. Therefore, the sludge feeding time becomes very long. When the plate and frame stop feeding as the output water begins to decrease and start pressing, the sludge cake is often difficult to form, easily causing sludge to stick to the filter cloth, leading to the failure of the filter cloth. Furthermore, the resulting sludge cake has a sandwich structure, that is, the sludge cake is dry on the outside and wet on the inside. This results in a persistently high moisture content in the sludge. Sludge with excessively high moisture content can mostly only be sent to power plants for incineration or chemical processing, with limited treatment options.

[0004] Therefore, there is an urgent need for a filter press that can reduce the moisture content of sludge. Utility Model Content

[0005] In order to reduce the moisture content of sludge after filtration, this application provides a diaphragm filter press that reduces the moisture content of sludge.

[0006] This application provides a diaphragm filter press that reduces the moisture content of sludge, employing the following technical solution: A diaphragm filter press for reducing sludge moisture content includes a frame, several diaphragm plates, several auxiliary plates, a pressing plate, and a driving component. The pressing plate is mounted on the frame, and the diaphragm plates and auxiliary plates are arranged alternately on the frame. The driving component moves the diaphragm plates and auxiliary plates toward the pressing plate, causing the diaphragm plates to press against the auxiliary plates to form a cavity. Filter cloth is provided on both the diaphragm plates and auxiliary plates, and exhaust and drainage ports are provided on both the diaphragm plates and auxiliary plates for communicating with the cavity. A back-blowing device is provided on the pressing plate for air-drying and draining the filter cloth and sludge cake surface.

[0007] By adopting the above technical solution, by setting exhaust and drainage ports connected to the cavity on the diaphragm plate and the distribution plate, the discharge of air and filtrate during the filter press process can be accelerated, reducing air retention and filtrate accumulation in the cavity; the back-blowing device on the pressing plate dries and drains the filter cloth and the surface of the sludge cake, which can further reduce residual moisture, thereby reducing the moisture content of the sludge cake and improving the sludge reduction effect and filter press efficiency.

[0008] Optionally, the vent and drain ports are provided at the four corners of the diaphragm plate and the four corners of the mounting plate.

[0009] By adopting the above technical solution, the exhaust and drainage outlets are specifically set at the four corners of the diaphragm plate and the distribution plate, exhaust and drainage can be carried out simultaneously from multiple directions, further optimizing the gas and liquid discharge path, reducing local gas and liquid retention, accelerating the sludge filling speed of the cavity, shortening the feeding time, and improving the continuity of filter press.

[0010] Optionally, the diaphragm plate has a receiving groove that extends along the thickness direction of the diaphragm plate. The bottom of the receiving groove is provided with several protrusions, and a gap is formed between the protrusions and the filter cloth of the diaphragm plate to allow water and air to flow.

[0011] By adopting the above technical solution, the receiving groove and protrusion of the diaphragm plate form a gap for water and air flow. The gap forms a drainage channel, which can reduce the resistance of water passing through the mud cake and filter cloth, accelerate the mud-water separation speed, reduce the mud cake sandwich phenomenon, and reduce the moisture content.

[0012] Optionally, the filter plate has a flow protrusion on the side facing the diaphragm plate, and a gap is formed between the flow protrusion and the filter cloth of the filter plate to allow water and air to flow.

[0013] By adopting the above technical solution, the distribution plate forms a flow gap with the filter cloth through the flow protrusions, which can optimize the water and air discharge path on the distribution plate side, enhance the rapid separation function of mud and water, and form a synergistic effect with the gap of the diaphragm plate, further improving the solid-liquid separation efficiency.

[0014] Optionally, the driving component includes a hydraulic cylinder, a driving plate, and a hydraulic station. The driving plate is slidably connected to the frame along a direction close to or away from the pressing plate. The diaphragm plate and the matching plate are both located between the driving plate and the pressing plate. The length direction of the hydraulic cylinder is parallel to the sliding direction of the driving plate. The cylinder body is mounted on the frame. The piston rod of the hydraulic cylinder is connected to the driving plate. The hydraulic station is used to supply oil to the hydraulic cylinder.

[0015] By adopting the above technical solution, the driving component achieves stable driving through the oil cylinder, drive plate and hydraulic station, which can accurately control the diaphragm plate and the matching plate to move towards the pressing plate and press against it, ensuring the sealing effect of the filter chamber, avoiding mud and liquid leakage during the filtration process, and at the same time, it can stably maintain the filtration pressure and ensure the consistency of the filtration effect.

[0016] Optionally, the backflush device includes a compressed air source and a backflush pipe. The backflush pipe is connected to the drive plate. The backflush pipe is used to introduce air into the exhaust drain port, and the compressed air source is used to supply air to the backflush pipe.

[0017] By adopting the above technical solution, the backflushing device introduces gas into the exhaust and drainage port through the compressed air source and backflushing pipe, which can specifically blow away the residual filtrate between the surface of the mud cake and the filter cloth and discharge it through the exhaust and drainage port, reducing the moisture residue when the filter plate is loosened, and further reducing the moisture content of the mud cake.

[0018] Optionally, the backflush device includes a heating element, which includes a heating box and a heating tube. The heating box is disposed on the backflush tube, and the backflush tube communicates with the interior of the heating box. The heating tube passes through the heating box and is used to increase the temperature inside the heating box.

[0019] By adopting the above technical solution, the heating element increases the temperature of the backflushing gas through the heating box and heating pipe. The hot air flow can enhance the evaporation and drying effect of the residual filtrate, accelerate the moisture removal speed, and is especially suitable for deep dewatering of sludge with high water content, thereby improving the dryness of the sludge cake.

[0020] Optionally, the diaphragm plate is provided with an adjustment device for changing the protrusion degree of the protrusion. The adjustment device includes an adjustment plate, a connecting rod, a screw, and a threaded sleeve. An adjustment cavity is formed in the diaphragm plate. The adjustment plate is slidably connected to the adjustment cavity along the thickness direction of the diaphragm plate. The protrusion is disposed on the adjustment plate and protrudes through the receiving groove of the diaphragm plate. The screw is vertically disposed and rotatably connected to the receiving groove. The threaded sleeve is threadedly connected to the screw. One end of the connecting rod is rotatably connected to the threaded sleeve, and the other end of the connecting rod is rotatably connected to the adjustment plate.

[0021] By adopting the above technical solution, the adjustment device can change the degree of protrusion of the protrusion through the screw, connecting rod and other structures, thereby adjusting the size of the gap between the diaphragm plate and the filter cloth, adapting to the mud-water separation requirements of mud cakes of different thicknesses, optimizing the flow channel resistance, and ensuring that efficient drainage can still be maintained and the filter press efficiency can be maintained during the mud cake thickening process.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting exhaust and drainage ports on the diaphragm plate and the distribution plate, the air and filtrate are discharged more quickly. Combined with the back-flushing device to dry and drain the filter cloth and the surface of the filter cake, the moisture content of the filter cake can be reduced. 2. The optimized exhaust and drainage structure reduces the time for sludge to fill the filter plate chamber, and the efficient feeding and pressing mode shortens the duration of a single cycle. Attached Figure Description

[0023] Figure 1 It is a diaphragm filter press that reduces the moisture content of sludge.

[0024] Figure 2 yes Figure 1 A schematic diagram of the structure of the diaphragm plate and the supporting plate.

[0025] Figure 3 yes Figure 2 A cross-sectional view of the center panel, used to show the adjustment device.

[0026] Figure 4 yes Figure 1 A schematic diagram of the backflush device.

[0027] Reference numerals: 1. Frame; 2. Diaphragm plate; 21. Receiving groove; 22. Adjustment chamber; 23. Exhaust and drain port; 3. Assembly plate; 4. Pressing plate; 5. Drive component; 51. Oil cylinder; 52. Drive plate; 53. Hydraulic station; 6. Adjustment device; 61. Adjustment plate; 62. Connecting rod; 63. Screw; 64. Threaded sleeve; 7. Protrusion; 71. Flow protrusion; 8. Filter cloth; 9. Backflush device; 91. Compressed air source; 92. Backflush pipe; 93. Heating component; 931. Heating box; 932. Heating tube. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 -Appendix Figure 4 This application will be described in further detail.

[0029] This application discloses a diaphragm filter press that reduces the moisture content of sludge. (Refer to...) Figure 1 and Figure 2 A diaphragm filter press for reducing sludge moisture content includes a frame 1, several diaphragm plates 2, several auxiliary plates 3, a pressing plate 4, and a drive unit 5. The pressing plate 4 is vertically arranged and fixedly mounted on the frame 1. The drive unit 5 includes a hydraulic cylinder 51, a drive plate 52, and a hydraulic station 53. The drive plate 52 is vertically arranged and slides along the length of the frame 1. The length of the hydraulic cylinder 51 is parallel to the length of the frame 1 and is fixedly mounted on the frame 1. The piston rod of the hydraulic cylinder 51 is fixedly connected to the drive plate 52. The hydraulic station 53 provides power to the hydraulic cylinder 51. Several diaphragm plates 2 and several auxiliary plates 3 are located between the pressing plate 4 and the drive plate 52. The diaphragm plates 2 and auxiliary plates 3 are alternately distributed along the distance between the pressing plate 4 and the drive plate 52. Both the diaphragm plates 2 and auxiliary plates 3 are slidably connected to the frame 1. Both the diaphragm plates 2 and auxiliary plates 3 have feed inlets.

[0030] Reference Figure 2 and Figure 3Both sides of the diaphragm plate 2 are provided with receiving grooves 21. The receiving grooves 21 extend along the thickness direction of the diaphragm plate 2. When the diaphragm plate 2 and the supporting plate 3 are pressed together, the receiving grooves 21 of the diaphragm plate 2 and the supporting plate 3 form a cavity for receiving mud cake. The four corners of the diaphragm plate 2 and the four corners of the supporting plate 3 are provided with exhaust and drainage ports 23. The exhaust and drainage ports 23 extend along the length direction of the frame 1 and penetrate the corresponding plates. The exhaust and drainage ports 23 are connected to the cavity.

[0031] Reference Figure 2 and Figure 3 An adjustment device 6 is provided on the diaphragm plate 2. The adjustment device 6 includes an adjustment plate 61, a connecting rod 62, a screw 63, and a threaded sleeve 64. An adjustment cavity 22 is opened in the diaphragm plate 2. The adjustment plate 61 is vertically arranged and slides along the thickness direction of the diaphragm plate 2 to be connected to the adjustment cavity 22. The screw 63 is vertically arranged and rotatably connected to the adjustment cavity 22. The upper end of the screw 63 extends out of the diaphragm plate 2. The threaded sleeve 64 is coaxially arranged with the screw 63 and is threadedly connected to the screw 63. One end of the connecting rod 62 is rotatably connected to the adjustment plate 61, and the other end of the connecting rod 62 is rotatably connected to the threaded sleeve 64. Several protrusions 7 are provided on the adjustment plate 61, and the protrusions 7 extend out of the bottom of the receiving groove 21.

[0032] Reference Figure 2 The side wall of the distribution plate 3 facing the diaphragm plate 2 is provided with several flow protrusions 71. Both the diaphragm plate 2 and the distribution plate 3 are provided with filter cloth 8. A gap for water supply and air flow is formed between the filter cloth 8 and the protrusions 7 of the diaphragm plate 2. A gap for water supply and air flow is also formed between the filter cloth 8 and the flow protrusions 71 of the distribution plate 3.

[0033] Reference Figure 1 and Figure 4 The drive plate 52 is also equipped with a backflush device 9, which includes a compressed air source 91, a backflush pipe 92, and a heating element 93. One end of the backflush pipe 92 is connected to the output end of the compressed air source 91. The backflush pipe 92 is a flexible hose. The other end of the backflush pipe 92 is provided with four branch pipes. The four branch pipes are connected to the drive plate 52. The four branch pipes are used to supply air to the exhaust drain port 23. The heating element 93 includes a heating box 931 and a heating pipe 932. The backflush pipe 92 is connected to the heating box 931. The heating pipe 932 passes through the heating box 931. The heating pipe 932 is used to introduce waste gas with residual heat from the factory.

[0034] The implementation principle of a diaphragm filter press for reducing sludge moisture content in this application embodiment is as follows: Sludge is conveyed through the feed inlet to the space between the diaphragm plate 2 and the distribution plate 3. Through the squeezing between the diaphragm plate 2 and the distribution plate 3, the sludge and water are separated. Water and air are quickly squeezed out from the four exhaust and drainage ports 23 of the diaphragm plate 2 and the distribution plate 3 through the filter cloth 8. After the sludge enters the space between the diaphragm plate 2 and the distribution plate 3, the diaphragm plate 2, through the protrusions 7, enables the sludge and water to be separated quickly, allowing the water to pass through the sludge cake layer more quickly and reach the drainage port. That is, the feeding process replaces part of the water pressing function, making the feeding and pressing process highly efficient. Then, through the exhaust and drainage ports 23 of the distribution plate 3, the water can be quickly discharged from the sludge cake. After the drainage is completed, the back-blowing device 9 blows air between the filter cloth 8 and the sludge cake to reduce the adhesion of the sludge cake to the filter cloth 8. Furthermore, the heating element 93 makes the blown air hot, further reducing the moisture content of the sludge cake.

[0035] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A diaphragm filter press for reducing sludge moisture content, comprising a frame (1), a plurality of diaphragm plates (2), a plurality of auxiliary plates (3), a pressing plate (4), and a driving component (5), wherein the pressing plate (4) is disposed on the frame (1), the diaphragm plates (2) and auxiliary plates (3) are arranged alternately on the frame (1), and the driving component (5) is used to move the diaphragm plates (2) and auxiliary plates (3) toward the pressing plate (4) and cause the diaphragm plates (2) to press against the auxiliary plates (3) to form a cavity, wherein filter cloth (8) is disposed on both the diaphragm plates (2) and the auxiliary plates (3), characterized in that: Both the diaphragm plate (2) and the mounting plate (3) are provided with exhaust and drainage ports (23), which are used to communicate with the cavity. The pressing plate (4) is provided with a back-blowing device (9) for air-drying and draining the filter cloth (8) and the surface of the mud cake.

2. A diaphragm filter press for reducing sludge moisture content according to claim 1, characterized in that: The vent and drain outlets (23) are provided at the four corners of the diaphragm plate (2) and the four corners of the mounting plate (3).

3. A diaphragm filter press for reducing sludge moisture content according to claim 1, characterized in that: The diaphragm plate (2) has a receiving groove (21) inside. The receiving groove (21) extends along the thickness direction of the diaphragm plate (2). The bottom of the receiving groove (21) is provided with several protrusions (7). A gap is formed between the protrusions (7) and the filter cloth (8) of the diaphragm plate (2) to allow water and air to flow.

4. A diaphragm filter press for reducing sludge moisture content according to claim 1, characterized in that: The panel (3) has a flow protrusion (71) on the side facing the diaphragm plate (2), and a gap is formed between the flow protrusion (71) and the filter cloth (8) of the panel (3) for water and air to flow.

5. A diaphragm filter press for reducing sludge moisture content according to claim 1, characterized in that: The drive unit (5) includes a cylinder (51), a drive plate (52), and a hydraulic station (53). The drive plate (52) is slidably connected to the frame (1) in a direction close to or away from the pressure plate (4). The diaphragm plate (2) and the matching plate (3) are both located between the drive plate (52) and the pressure plate (4). The length direction of the cylinder (51) is parallel to the sliding direction of the drive plate (52). The cylinder body of the cylinder (51) is set on the frame (1). The piston rod of the cylinder (51) is connected to the drive plate (52). The hydraulic station (53) is used to supply oil to the cylinder (51).

6. A diaphragm filter press for reducing sludge moisture content according to claim 5, characterized in that: The backflush device (9) includes a compressed air source (91) and a backflush pipe (92). The backflush pipe (92) is connected to the drive plate (52). The backflush pipe (92) is used to pass air into the exhaust drain port (23). The compressed air source (91) is used to supply air to the backflush pipe (92).

7. A diaphragm filter press for reducing sludge moisture content according to claim 6, characterized in that: The backflush device (9) includes a heating element (93), which includes a heating box (931) and a heating tube (932). The heating box (931) is disposed on the backflush tube (92), and the backflush tube (92) is connected to the interior of the heating box (931). The heating tube (932) passes through the heating box (931) and is used to increase the temperature inside the heating box (931).

8. A diaphragm filter press for reducing sludge moisture content according to claim 3, characterized in that: The diaphragm plate (2) is provided with an adjustment device (6) for changing the protrusion degree of the protrusion of the protrusion (7). The adjustment device (6) includes an adjustment plate (61), a connecting rod (62), a screw (63), and a threaded sleeve (64). An adjustment cavity (22) is opened in the diaphragm plate (2). The adjustment plate (61) is slidably connected to the adjustment cavity (22) along the thickness direction of the diaphragm plate (2). The protrusion (7) is set on the adjustment plate (61). The protrusion (7) passes through the receiving groove (21) of the diaphragm plate (2). The screw (63) is set vertically. The screw (63) is rotatably connected to the receiving groove (21). The threaded sleeve (64) is threadedly connected to the screw (63). One end of the connecting rod (62) is rotatably connected to the threaded sleeve (64). The other end of the connecting rod (62) is rotatably connected to the adjustment plate (61).

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