A belt filter press

Abstract

This application discloses a belt filter press, including a frame and a first filter belt, a second filter belt, and a third filter belt arranged sequentially from top to bottom. A gravity dewatering zone is formed above the first filter belt, and a pre-compression zone is formed above the second filter belt. The lower layer of the second filter belt and the upper layer of the third filter belt together form a pressing dewatering zone. A first baffle plate, a second baffle plate, a third baffle plate, and a fourth baffle plate are respectively installed on the inner side of the first filter belt, the bottom of the first filter belt, the inner side of the second filter belt, and the inner side of the third filter belt to collect the filtrate dripping from the upper filter belt. This application can solve the problem of increased sludge moisture content caused by filtrate dripping in traditional methods. By independently collecting and guiding the filtrate generated in each zone corresponding to different dewatering stages to the outside of the belt filter press for discharge, it avoids upstream filtrate entering the downstream dewatering zone. Therefore, it can better dry the sludge, avoid the squeezed filtrate returning to the sludge through the filter belt, and improve sludge dewatering efficiency.

Description

Technical Field

[0001] This application relates to the field of industrial filtration equipment technology, and in particular to a belt filter press. Background Technology

[0002] A belt filter press is a continuous solid-liquid separation device, mainly used for sludge dewatering and industrial filter cake treatment. Its core working principle involves sludge sequentially passing through three zones: gravity dewatering, pre-compression, and pressing. The flocculated sludge flocs are retained on the filter belt, while the filtrate is discharged through the belt, ultimately forming a sludge cake with low moisture content. However, existing belt filter presses typically employ a stacked structure for the gravity dewatering, pre-compression, and pressing zones, leading to the following two problems in practical applications:

[0003] The filtrate produced by gravity dewatering or filter belt pressing of the preceding sludge will seep down through the filter belt under the action of gravity. This causes the sludge that has already been treated in the upper layer to be re-contaminated by the seeping filtrate in the upper layer during the subsequent pressing process, which increases the moisture content of the lower layer of sludge again and affects the dewatering effect of the final sludge cake.

[0004] For belt filter presses, the filter belt needs to be washed with high-pressure water after pressing sludge to remove the sludge clogging the inside of the filter belt, thereby achieving the purpose of filter belt regeneration and reuse. This washing process generates a large amount of flowing water, which will also seep down into the subsequent pressing process due to gravity, thus affecting the moisture content of the final sludge cake.

[0005] To address the aforementioned issues, Chinese utility model patent CN219136632U discloses a water-blocking device for a filter press, which guides the flow of filtrate by setting up a drainage channel and a water guide plate. However, this solution still has drawbacks. The drainage channel and the water guide plate are separated and in an open state, making it easy for filtrate to overflow. Furthermore, the water-blocking device consists of multiple components, making installation and disassembly cumbersome and increasing maintenance and time costs.

[0006] Therefore, there is an urgent need for a new type of water-blocking device that is simple in structure, easy to maintain, and can completely guide the filtrate from each area to be discharged, so as to improve the dewatering efficiency of belt filter presses. Summary of the Invention

[0007] The purpose of this application is to solve the problem of contaminated water recirculation in the prior art. This application provides a belt filter press with a baffle plate.

[0008] To achieve the above objectives, this application adopts the following technical solution: a belt filter press, comprising a frame, a first filter belt, a second filter belt, and a third filter belt arranged sequentially from top to bottom on the frame and circulating in a front-back direction. A gravity dewatering zone is formed above the first filter belt, and a pre-compression zone is formed above the second filter belt. The lower layer of the second filter belt and the upper layer of the third filter belt together form a pressing dewatering zone. A first baffle plate, a second baffle plate, a third baffle plate, and a fourth baffle plate are respectively installed on the inner side of the first filter belt, the bottom of the first filter belt, the inner side of the second filter belt, and the inner side of the third filter belt to respectively receive the filtrate dripping from the upper filter belt. The first baffle plate, the second baffle plate, the third baffle plate, and the fourth baffle plate all extend inclinedly in the front-back direction.

[0009] In one possible implementation, the first, second, third, and fourth water-blocking plates each include a pair of slopes with an obtuse angle and a water-receiving trough connected to the pair of slopes. The water-receiving trough extends in a front-back direction, and the bottom of the water-receiving trough is lower than the lowest point of the pair of slopes.

[0010] In one possible implementation, the pair of slopes form a "V" shape with a low center and high sides, and the water receiving trough is located at the intersection between the pair of slopes, with the cross-section of the water receiving trough being U-shaped.

[0011] In one possible implementation, the water receiving tank has a drain hole at its lower end, and the belt filter press also includes multiple drainage channels that are respectively connected to the drain holes of each baffle plate.

[0012] In one possible implementation, the pair of slopes form a ridge-like structure with a high center and low sides, and each of the slopes has a water collection trough connected to its outer edge, with the water collection trough located at the lowest point of each slope.

[0013] In one possible implementation, the depth of the water receiving trough is 50-100mm.

[0014] In one possible implementation, the included angle between a pair of slopes is 135° to 170°.

[0015] In one possible implementation, the widths of the first and second baffles are respectively greater than the width of the first filter belt, and the widths of the third and fourth baffles are respectively greater than the widths of the second and third filter belts.

[0016] In one possible implementation, at least one of the first, second, third, and fourth water-blocking plates has a plurality of groove structures on its surface in contact with water, and the plurality of grooves extend from the outer edge of each water-blocking plate to the center of the water-blocking plate; each water-blocking plate is made of a corrosion-resistant material; and each water-blocking plate has a hydrophobic coating on its surface.

[0017] In one possible implementation, at least one of the first, second, third, and fourth baffles is detachably connected to the frame.

[0018] This application provides a baffle plate device for a belt filter press, which effectively solves the problem of increased sludge moisture content caused by filtrate dripping in the prior art. Corresponding to the three dewatering stages—gravity dewatering zone, pre-compression zone, and pressing dewatering zone—the device independently collects and guides the filtrate generated in each zone to the outside of the belt filter press for discharge, thereby preventing upstream filtrate from entering the downstream dewatering zone. This significantly reduces the moisture content of the final sludge cake, improves dewatering efficiency, and allows for better sludge drying, preventing return water from flowing back into the sludge through the filter belt, thus improving sludge dewatering efficiency.

[0019] The main beneficial effects of this application are:

[0020] (1) Multiple zones are independently guided to avoid filtrate backflow and improve dewatering efficiency: The first baffle plate and the second baffle plate (gravity dewatering zone), the third baffle plate (pre-compression zone) and the fourth baffle plate (pressing dewatering zone) are set independently, so that the filtrate generated in each dewatering stage is collected separately and guided to the outside of the filter press for discharge, avoiding upstream filtrate backflow to the downstream dewatering zone, thereby significantly reducing the moisture content of the final cake and improving the overall dewatering efficiency.

[0021] (2) Optimize the structure of the baffle plate to enhance the filtrate collection capacity: By forming a flow guide structure with a low center and high sides or a high center and low sides through a pair of inclined slopes, the filtrate can be quickly collected into the water receiving tank and discharged through the drainage channel to prevent the filtrate from dripping or splashing, or to avoid secondary pollution of the sludge by the filtrate.

[0022] (3) Modular and detachable design for easy maintenance and replacement

[0023] Each baffle plate is detachably connected to the frame via connecting rods (such as bolts, clips, or flanges), which facilitates installation, cleaning, or replacement and reduces maintenance costs. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a belt filter press provided for one embodiment of this application.

[0025] Figure 2This is a top view of the baffle plate below the gravity dehydration zone in one embodiment of this application.

[0026] Figure 3 This is a three-dimensional schematic diagram of a water baffle plate in one embodiment of this application.

[0027] Figure 4 This is a cross-sectional view of the baffle plate in one embodiment of this application.

[0028] Figure 5 This is a top view of the baffle plate below the gravity dehydration area in another embodiment of this application.

[0029] Figure 6 This is a perspective view of the baffle plate in another embodiment of this application.

[0030] Figure 7 This is a cross-sectional view of the baffle plate in another embodiment of this application.

[0031] The components are as follows: 10. Gravity dewatering zone; 11. First baffle plate; 12. Second baffle plate; 13. First filter belt; 14, 15. Gravity dewatering roller; 16. First correction roller; 20. Pre-compression zone; 21. Third baffle plate; 22. Second filter belt; 23, 24. Pre-compression roller; 30. Pressing dewatering zone; 31. Fourth baffle plate; 32. Third filter belt; 33, 34. Extrusion roller; 35, 36. High-pressure roller; 4. Frame; 5. Water receiving trough; 6. Drainage hole; 7. Drainage channel; 8. Water receiving trough; 9. Groove. Detailed Implementation

[0032] To explain in detail the technical content, structural features, achieved objectives, and effects of the utility model, the technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. In the following description, for illustrative purposes, numerous specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the utility model. However, various exemplary embodiments may also be implemented without these specific details or in one or more equivalent arrangements. Furthermore, the various exemplary embodiments may differ, but are not necessarily exclusive. For example, the specific shape, construction, and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment without departing from the inventive concept.

[0033] In the following description, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0034] Furthermore, in this application, spatial relative terms such as “below,” “under,” “under,” “lower,” “above,” “upper,” “above,” “higher,” and “side” (e.g., as in “sidewall”) are used to describe the relationship between one component and another component as shown in the accompanying drawings. The spatial relative terms are intended to include different orientations of the equipment in use, operation, and / or manufacture other than those depicted in the drawings.

[0035] In this application, unless otherwise expressly specified and limited, the term "connection" shall be interpreted broadly. For example, "connection" may be a fixed connection, a detachable connection, or an integral part; it may be a direct connection or an indirect connection through an intermediate medium.

[0036] like Figure 1 As shown, this application provides a belt filter press, including a frame 4 and a first filter belt 13, a second filter belt 22, and a third filter belt 32 arranged sequentially from top to bottom on the frame and circulating in the front-back direction. A gravity dewatering zone 10 is formed above the first filter belt 13, and a pre-compression zone 20 is formed above the second filter belt 22. The lower layer of the second filter belt 22 and the upper layer of the third filter belt 32 together form a pressing dewatering zone 30. The first filter belt 13, the second filter belt 22, and the third filter belt 32 are independent of each other and circulate in a cycle.

[0037] The first filter belt 13 is tensioned on the outside of the gravity dewatering rollers 14 and 15 and the first alignment roller 16. The first filter belt 13 extends in the front-to-back direction and its rear end is inclined downward. A first baffle plate 11 is provided on the inner side of the first filter belt 13, and a second baffle plate 12 is provided at the bottom of the first filter belt 13. A backwashing device for cleaning the first filter belt is provided below the first filter belt 13. The first baffle plate 11 and the second baffle plate 12 are approximately parallel to the direction of the upper filter belt of the first filter belt 13, and the left and right sides of the first baffle plate 11 extend to the frame 4. The width of the first baffle plate 11 and the second baffle plate 12 is greater than the width of the first filter belt 13. In actual operation, the material enters from behind the first filter belt 13, the first filter belt 13 rotates counterclockwise, the material is in the gravity dewatering zone 10, the filtrate flows downward and is collected by the first baffle plate 11, and the backwash water of the first filter belt 13 is collected by the second baffle plate 12.

[0038] The second filter belt 22 is tensioned on the outside of multiple pre-compression rollers 23 and 24 and multiple extrusion rollers 33 and 34. A second baffle plate 21 is installed in the second filter belt 22. The second baffle plate 21 is located below the upper filter belt of the second filter belt 22. Similarly, the second baffle plate 21 extends in the front-to-back direction and its rear end is inclined downward. The gravity dewatering zone and the pre-compression zone are independent of each other. The sludge leaving the first filter belt 13 falls to the front end of the second filter belt 22 in the pre-compression zone. The second filter belt 22 rotates in a clockwise direction. The third baffle plate 21 receives the sludge filtrate that has been pre-compressed on the second filter belt 22.

[0039] The third filter belt 32 is tensioned on the outside of multiple extrusion rollers 33 and 34 and multiple high-pressure rollers 35 and 36, and rotates counterclockwise. A fourth baffle plate 31 is installed on the inner side of the third filter belt. The fourth baffle plate 31 is located below the upper filter belt of the third filter belt 32 and the multiple extrusion rollers. The central part of the fourth baffle plate 31 extends roughly in the front-to-back direction, and the front and rear ends of the fourth baffle plate curve upward to form a concave longitudinal cross section. The lower filter belt of the second filter belt 22 and the upper filter belt of the third filter belt 32 overlap in the pressing and dewatering zone and squeeze each other, so that the material sandwiched between the second filter belt 22 and the third filter belt 32 is squeezed and dried, and the filtrate falls into the fourth baffle plate 31, collects and is guided away.

[0040] The two ends of the first baffle plate 11, the second baffle plate 12, the third baffle plate 21, and the fourth baffle plate 31 are respectively fixedly connected to the frame 4 of the belt filter press via connecting rods. In the preferred embodiment of this application, the connection between the baffle plate and the belt filter press via connecting rods is a detachable connection, including but not limited to bolt connection, snap connection, or flange connection.

[0041] Each baffle plate is wider than the filter belt. By adjusting the height difference between the two ends of the baffle plate, a guiding slope can be formed to receive the filtrate passing through the filter belt and guide it along its inclined direction to the outside of the belt filter press for discharge. In some embodiments of this application, the baffle plate is made of stainless steel, engineering plastic, or a metal material with anti-corrosion surface treatment. The surface of the baffle plate is provided with a hydrophobic coating to increase its corrosion resistance and stability, and to increase its service life. Example

[0042] See Figure 2 , 3 As shown in Figure 4, this embodiment illustrates a structure that can be used for the first, second, and third water-blocking plates described above. The fourth water-blocking plate is formed by bending this water-blocking plate structure, or by forming multiple water-blocking plates. Figure 3The water-retaining plate structure shown is assembled from two slopes with an obtuse angle and a water-receiving groove connected to the two slopes. The two slopes are joined together at a predetermined angle of 135° to form a "∨" shaped structure. A water-receiving groove 5 extending along the length of the water-retaining plate is provided at the connection point of the two slopes. The cross-section of the water-receiving groove 5 is U-shaped, and its bottom is lower than the connection line of the two slopes. The depth of the water-receiving groove 5 is 50-100mm.

[0043] In one embodiment, the bottom of the water receiving tank 5 at the inclined lower end is provided with a drain hole 6, and the filtrate collected in the water receiving tank 5 is guided out through the drain hole 6 connected to the drain channel 7.

[0044] In a preferred embodiment, the surface of the baffle plate that contacts the filtrate is provided with a plurality of groove structures 9. The groove structures 9 extend from the edge of the baffle plate toward the center, so that when the filtrate falls, it can flow orderly along the grooves to the water receiving tank. The bottom of the water receiving tank is lower than the lowest point of a pair of slopes, so that the filtrate can be smoothly collected and guided to the drainage channel 7. Example

[0045] The difference between this embodiment and Embodiment 1 is that the water-retaining plate structure in this embodiment is ridge-shaped, with a high center and low sides. The water-retaining plate is composed of a pair of slopes joined together at a predetermined angle of 150° to form a "∧" shaped structure. Figure 5 , 6 As shown in Figure 7, a connecting water tank 8 is provided at each of the two non-adjacent ends of a pair of slopes. The outer side wall of each connecting water tank 8 is provided with an upwardly extending baffle with a baffle height of 50-100mm. An opening is provided at the lower end of the water tank 8, which can be used to export the collected filtrate and finally guide it to the outside of the filter press through the drainage channel.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope. The scope of protection of this utility model is defined by the appended claims, specification, and their equivalents.

Claims

1. A belt filter press, comprising a frame, a first filter belt, a second filter belt, and a third filter belt arranged sequentially from top to bottom on the frame and circulating in a back-and-forth direction, characterized in that: A gravity dewatering zone is formed above the first filter belt, and a pre-compression zone is formed above the second filter belt. The lower filter belt of the second filter belt and the upper filter belt of the third filter belt together form a pressing dewatering zone. A first baffle plate, a second baffle plate, a third baffle plate, and a fourth baffle plate are respectively installed on the inner side of the first filter belt, the bottom of the first filter belt, the inner side of the second filter belt, and the inner side of the third filter belt to receive the filtrate dripping from the upper filter belt. The first baffle plate, the second baffle plate, the third baffle plate, and the fourth baffle plate all extend inclinedly in the front-back direction.

2. A belt filter according to claim 1, characterized in that The first, second, third, and fourth water-blocking plates each include a pair of slopes with an obtuse angle and a water-receiving trough connected to the pair of slopes. The water-receiving trough extends in the front-back direction, and the bottom of the water-receiving trough is lower than the lowest point of the pair of slopes.

3. A belt filter according to claim 2, characterised in that The pair of slopes form a "V" shape structure with a low center and high sides. The water receiving trough is located at the intersection between the pair of slopes, and the cross-section of the water receiving trough is U-shaped.

4. A belt filter according to claim 3, characterised in that The water receiving tank is provided with a drain hole at its lower end, and the belt filter press also includes multiple drainage channels that are respectively connected to the drain holes of each baffle plate.

5. A belt filter according to claim 2, characterized in that The two slopes form a ridge-like structure with a high center and low sides. Each slope has a water collection trough connected to its outer edge, and the water collection trough is located at the lowest point of each slope.

6. A belt filter according to claim 2, characterized in that The depth of the water receiving trough is 50-100mm.

7. A belt filter according to claim 2, characterized in that The included angle between a pair of slopes is 135° to 170°.

8. A belt filter according to claim 1, characterized in that The widths of the first and second baffles are greater than the width of the first filter belt, and the widths of the third and fourth baffles are greater than the widths of the second and third filter belts, respectively.

9. A belt filter according to claim 1, characterized in that At least one of the first, second, third, and fourth water-blocking plates has a plurality of groove structures on its surface in contact with water, and the plurality of grooves extend from the outer edge of each water-blocking plate to the center of the water-blocking plate; each water-blocking plate is made of a corrosion-resistant material; and each water-blocking plate has a hydrophobic coating on its surface.

10. A belt filter according to claim 1, characterized in that At least one of the first, second, third, and fourth water baffles is detachably connected to the frame.

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