Water-containing material laying device

Abstract

The application discloses a device for laying sludge, which comprises a sludge laying assembly; wherein the sludge laying assembly comprises a first assembly and a second assembly, each of which has a channel; the second end of the second assembly is provided with a discharging port; the second end of the first assembly is connected with the first end of the second assembly, so that the channel of the first assembly is communicated with the channel of the second assembly; the cross section of the channel of the second assembly is the same in the direction perpendicular to the sludge advancing direction; the bottom surface of the second assembly for carrying sludge is a plane; the cross section area of the channel of the first assembly at the second end is smaller than that at the first end; and the cross section of the channel of the second assembly is the same as that of the channel of the first assembly at the second end. The device can more uniformly lay the water-containing material (such as sludge) on the filter cloth.

Description

Technical Field

[0001] This invention belongs to the field of solid-liquid separation technology, specifically, it relates to equipment for solid-liquid separation of sludge, and more specifically, it relates to a device for laying sludge in a sludge treatment system. Background Technology

[0002] As the amount of urban sewage generated continues to increase, the number of corresponding sewage treatment facilities is also increasing, leading to a growing amount of sludge, a byproduct of sewage treatment. How to properly handle and dispose of this ever-increasing volume of sludge has become an urgent environmental protection issue in my country.

[0003] The remaining sludge undergoes solid-liquid separation, and the separated liquid and solid are further purified using appropriate methods. There are various methods for solid-liquid separation, including pressing, extrusion, and centrifugation, and correspondingly, a wide variety of equipment is used. Currently, belt dewatering machines are widely used. In belt dewatering machines, the material is placed between two filter belts, and pressure is applied by pressure rollers. The advantages are that the filter belts are made of soft material, which does not form a fixed-volume cavity, resulting in a high compressibility limit for the material. However, it suffers from problems such as short extrusion time and low extrusion pressure.

[0004] Filtration is also a common method for dewatering materials with high water content (such as residual sludge). It involves using filter cloth to support the water-containing material for dewatering, folding the filter cloth, spraying it with the material, and then subjecting it to prolonged compression. This ensures that all the filter cloth and the water-containing material on it receive a longer compression time and greater compression pressure. For example, the applicant's patent applications CN202210362474.5 and CN202210363857.4 both involve laying multiple layers of water-containing material (sludge) on filter cloth and separating the solid and liquid components of the sludge through compression.

[0005] Laying sludge on the filter cloth is a crucial step in this method, aiming to maximize the thickness of each layer. For example, Chinese Patent Application Publication CN114748900A discloses a material-laying device where the repeated movement of the push plate of the cloth coating device evenly coats the material between two layers of filter cloth. Summary of the Invention

[0006] On the one hand, this application provides an apparatus for laying sludge, which can more evenly lay water-containing materials (such as sludge) on filter cloth.

[0007] On the other hand, the sludge laying device of this application can not only lay filter cloth, but also evenly lay sludge on the filter cloth, shortening the time for laying multiple layers of sludge.

[0008] On the other hand, the sludge laying method of this application can evenly lay sludge on the filter cloth in a short time, thereby improving the sludge laying efficiency.

[0009] This application discloses a sludge laying device, comprising: a sludge laying assembly; wherein the sludge laying assembly includes a first assembly and a second assembly, each having a channel; the second end of the second assembly is provided with a discharge port; the second end of the first assembly is connected to the first end of the second assembly, such that the channels of the first assembly and the channels of the second assembly are connected; the channels of the second assembly have the same cross-section perpendicular to their bottom surface; the bottom surface of the second assembly that supports the sludge is a plane; the cross-sectional area of ​​the channel of the first assembly at the second end is smaller than the cross-sectional area at the first end; and the cross-section of the channel of the second assembly is the same as the cross-section of the channel of the first assembly at the second end.

[0010] Specifically, in the horizontal direction perpendicular to the sludge flow direction, the width of the second end of the first component channel is greater than the width of the first end; in the vertical direction perpendicular to the sludge flow direction, the height of the second end of the first component channel is less than the height of the first end.

[0011] Using the sludge-laying component of this application, sludge can flow out evenly from the outlet of the first component and be laid on the filter cloth. No additional component is needed to scrape the sludge on the filter cloth.

[0012] On the other hand, there is a sludge-laying device in which multiple sludge-laying components are distributed in parallel within the housing.

[0013] The number of sludge-laying components installed in the sludge-laying device can be adjusted depending on the scale of sludge treatment and conditions such as the width of the filter cloth. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the mud-laying component;

[0015] Figure 2 This is a top view of the mud-laying assembly;

[0016] Figure 3 This is a schematic diagram of an existing mud-laying component;

[0017] Figure 4 This is a schematic diagram of the sludge laying device;

[0018] Figure 5 This is a cross-sectional schematic diagram of the sludge laying device;

[0019] Figure 6 This is a magnified view of a part of the sludge-laying device. Detailed Implementation

[0020] The apparatus for laying sludge according to the present invention is described in further detail below, but this does not limit the scope of protection of this application, which is defined by the claims. Certain specific details disclosed provide a comprehensive understanding of the various disclosed embodiments. However, those skilled in the art will know that embodiments can be implemented without using one or more of these specific details, but with other materials, etc.

[0021] Unless the context otherwise requires, the terms “comprising” and “including” in the specification and claims shall be understood as open-ended and inclusive, meaning “including, but not limited to”.

[0022] The terms "implementation," "an implementation," "another implementation," or "certain implementations" used in this specification refer to specific features, structures, or characteristics described in relation to the implementation, which are included in at least one implementation. Therefore, "implementation," "an implementation," "another implementation," or "certain implementations" do not necessarily all refer to the same implementation. Furthermore, specific features, structures, or characteristics can be combined in any way within one or more implementations. Each feature disclosed in this specification can be replaced by any alternative feature that provides the same, equivalent, or similar purpose. Therefore, unless otherwise specified, the disclosed features are merely general examples of equivalent or similar features.

[0023] Existing sludge-laying components suffer from uneven sludge discharge, with inconsistent sludge thickness on the filter cloth. Some areas have thicker sludge, while others have almost no sludge or a very thin layer. Therefore, additional components are needed to level the sludge on the filter cloth; or the uneven, multi-layered sludge can be directly compressed, resulting in poor solid-liquid separation.

[0024] This application discloses a sludge laying device, comprising: a sludge laying assembly; wherein the sludge laying assembly includes a first assembly and a second assembly, each having a channel; the second end of the second assembly is provided with a discharge port; the second end of the first assembly is connected to the first end of the second assembly, such that the channels of the first assembly and the channels of the second assembly are connected; the channels of the second assembly have the same cross-section perpendicular to the sludge travel direction; the bottom surface of the second assembly bearing the sludge is a plane; the cross-sectional area of ​​the channel of the first assembly at the second end is smaller than the cross-sectional area at the first end; and the cross-section of the channel of the second assembly is the same as the cross-section of the channel of the first assembly at the second end.

[0025] The first end of the first component is connected to the channel of the third component for conveying sludge. Sludge from the third component enters the second component from the end of the first component with a larger cross-sectional area. Due to the change in the cross-sectional area of ​​the channel in the second component, a pressurizing effect is applied within the channel, resulting in a wider distribution of sludge in the horizontal direction perpendicular to the sludge flow (i.e., the width of the channel) within the second component. After flowing into the second component from the end of the first component with a smaller cross-sectional area, the sludge further spreads horizontally within the channel of the second component, potentially occupying the entire channel, and then flows out evenly from the outlet of the second component, spreading onto the filter cloth.

[0026] In some implementations, in the horizontal direction perpendicular to the sludge flow direction, the width of the second end of the first component channel is greater than the width of the first end.

[0027] In the vertical direction perpendicular to the sludge flow direction, the height of the second end of the first component channel is less than the height of the first end.

[0028] Alternatively, the width of the channel in the first component gradually increases from the first end to the second end.

[0029] The height of the channel in the first component gradually decreases from the first end to the second end.

[0030] Through the design of the first component channel structure, sludge enters the channel through the first section of the first component. During its movement, the pressure gradually increases, and the sludge gradually disperses from the center of the first component to both sides in a continuous manner. The bottom dynamic center of the first component channel is continuously dispersed to both sides in the width direction.

[0031] Alternatively, the cross-section of the channel at the first end of the first component can be circular, near-circular, polygonal, elliptical, or other shapes. Considering ease of processing and assembly, a more preferred option is that the cross-section of the channel at the first end of the first component can be circular or near-circular.

[0032] The first component channel has a cross-section at the second end that is a polygon with a straight line in the width direction. Preferably, it can be a polygon with parallel sides, such as a parallelogram or rectangle.

[0033] In some implementations, the cross-sectional area of ​​the first component channel at the second end is 0.7-1.0 times that of the first end.

[0034] In some embodiments, the length of the first component in the sludge flow direction is in a ratio of 1:0.6 to 1:3 to the width of the first component channel at the second end.

[0035] The width of the second end of the first component refers to the length of the second component channel in the horizontal direction perpendicular to the sludge flow direction.

[0036] The length of the first component refers to the length between the first end and the second end.

[0037] In some embodiments, the ratio of the length L1 of the first component to the length L2 of the second component in the sludge flow direction is 1:0.5 to 1:8.

[0038] The cross-section of the second component channel is a polygon with a straight line in the width direction. Preferably, it can be a polygon with parallel sides at the top and bottom; more preferably, the structures on both sides between the top and bottom surfaces of the second component channel are symmetrically arranged.

[0039] For example, the cross-section of the second component channel can be rectangular, etc. That is, the cross-sectional shape of the second component channel is the same as that of the first component channel at the second end.

[0040] The sludge discharged from the second end of the first component flows into the channel of the second component in the width direction, towards the side walls. The sludge can be continuously dispersed throughout the bottom of the channel of the second component and flows out evenly through the outlet of the second component.

[0041] The second end of the second component is arc-shaped with the discharge port facing downwards.

[0042] The first and second components of this application can be integrated as one unit or separate units.

[0043] With the sludge-laying assembly of this application, sludge flowing in from the first end of the first assembly can flow out evenly and continuously through the outlet after passing through the channels of the first and second assemblies, and is evenly and continuously distributed on the filter cloth. The thickness of the sludge laid on the filter cloth is relatively uniform, or the surface of the sludge is relatively flat. No additional steps or components are needed to level the laid sludge. Therefore, while saving process steps or reducing components, a good solid-liquid separation effect can be achieved.

[0044] On the other hand, there is a device for laying sludge, wherein the sludge-laying component is placed in the cavity inside the housing.

[0045] The bottom surface of the cavity inside the shell is provided with a material laying port, and the discharge port at the second end of the second component of the mud laying assembly coincides with the material laying port in a direction perpendicular to the bottom surface.

[0046] The cross-sectional area of ​​the material spreading port is greater than or equal to the cross-sectional area of ​​the discharge port at the second end of the second component. This configuration allows sludge to flow downwards through the discharge port of the second component of the material spreading assembly and the material spreading port of the shell.

[0047] A downwardly extending pusher head is provided at the first end of the housing near the material inlet and substantially parallel to the second end of the second component. The first end of the pusher head is connected to the first end of the housing. During the pushing process, the second front end of the pusher head, which is opposite to the first end, is lower than the material inlet.

[0048] Alternatively, the shell and the pusher head are an integral structure, with the end of the pusher head extending downwards below the material inlet. The height difference between the second end of the pusher head and the material inlet is greater than the thickness of the sludge being laid.

[0049] Therefore, during the filter cloth laying process, the pusher head can push the filter cloth forward and press it down, so that there is a certain distance between the filter cloth and the material laying port, leaving space in the vertical direction for laying a certain thickness of sludge, and the sludge laid on the filter cloth will not stick to the sludge laying component.

[0050] In some implementations, the cross-section perpendicular to the inclined plane gradually decreases from the first end to the second end of the pusher head.

[0051] That is, the second end of the pusher head that contacts the filter cloth has the smallest cross-sectional area and the least friction with the filter cloth. During the cloth laying process, the second end of the pusher head moves forward against the filter cloth. The friction between the pusher head and the filter cloth is small, making it easier to lay the filter cloth.

[0052] In some embodiments, the second end of the coating head is configured as an arc shape. The arc shape is an arc protruding in a downward direction towards the coating head.

[0053] The arc-shaped second end can smoothly push the filter cloth, reducing the stress on the filter cloth during the laying process.

[0054] In some implementations, the fabric pusher includes:

[0055] A pusher column is provided at the second end of the pusher head; a back plate at the first end; and two support plates, each of which extends from the outer peripheral wall of the pusher column toward the second end back plate, connecting the pusher column and the back plate.

[0056] The cross-section of the pusher column is circular or near-circular.

[0057] The back plate is basically quadrilateral in shape. In the vertical direction perpendicular to the sludge flow direction, the length of the back plate is less than the diameter of the pusher column.

[0058] Preferably, the shape of the rear plate is consistent with that of the first end of the housing.

[0059] The diameter of the pusher column is smaller than the length of the rear plate in the vertical direction, or the diameter of the pusher column is smaller than the height of the first end of the housing in the vertical direction.

[0060] The end of the support plate is smoothly connected to the outer peripheral wall of the pusher column.

[0061] The fabric pusher can be separate from the housing or integrated into it. When the fabric pusher is integrated into the housing, the back plate of the fabric pusher can be replaced by the first end of the housing.

[0062] Optionally, a reinforcing plate can be installed between the two support plates. The reinforcing plate increases the mechanical strength of the fabric pusher.

[0063] In some embodiments, the fabric pusher head is rotatably connected to the housing. That is, the fabric pusher head is rotatably connected to the first end of the housing.

[0064] The pusher head includes a first position that can be rotated upwards to an upper limit and a second position that can be rotated downwards to a lower limit.

[0065] In the first position, the second end of the pusher head is higher than the top surface of the sludge layer. In the second position, the distance between the second end of the pusher head and the material inlet is greater than the thickness of the sludge layer.

[0066] This configuration allows the second end of the pusher head to press against the filter cloth during sludge laying. Under the force of the filter cloth, it rotates to a second position, which is a certain distance below the sludge laying inlet. This distance allows for sufficient space to accommodate the pre-flowing sludge. Alternatively, the distance between the sludge laying inlet and the second end of the pusher head can be greater than the thickness of the laid sludge, preventing the lower surface of the housing from contacting and becoming contaminated with the sludge. In practical use, the initial sludge flow velocity can be used to calculate the thickness of each sludge flow. Based on this thickness, the pusher head can be designed to control the second position of its second end during sludge laying.

[0067] Optionally, when the pusher head rotates to the first position, the height of the pusher column axis is lower than the height of the pusher head rotation center.

[0068] An elastic element is provided between the pusher head and the first end of the housing for driving the pusher head to rotate to the first position.

[0069] In some implementations, multiple sets of mud-laying components are arranged side-by-side within the housing.

[0070] Specifically, the second component of multiple mud-laying assemblies is laid side by side inside the shell.

[0071] Alternatively, the discharge ports of the second component can be aligned with each other.

[0072] On the other hand, a method for laying sludge, using the above-mentioned sludge laying device, wherein the sludge flows into the channel through the first end of the first component and flows onto the filter cloth from the outlet of the second component.

[0073] The sludge in this application may include sludge from water treatment plants, domestic sewage, industrial sludge, and dredging sludge from urban water bodies. Sludge typically contains various microorganisms, organic matter, and inorganic particles. Sludge not only contains solid matter but also has a certain degree of viscosity, making it relatively difficult to disperse and distribute.

[0074] The inventors tried various methods, such as designing the first component as a single-diameter expansion structure and the second component as a constant-diameter structure. After the sludge flows into the first component from the small cross-section end, it is easy for it to concentrate and flow to both sides, or simply spray onto the filter cloth from the middle of the channel. It is difficult to spread the sludge evenly on the filter cloth.

[0075] In some embodiments, the sludge of this application has an adhesion stress of 400-1500 Pa and a water content of 75wt%-88wt%.

[0076] Optionally, the relationship between the unit flow rate of sludge and the cross-sectional area of ​​the discharge port of the second component can be 0.015–0.04 L / (s·cm). 2 ).

[0077] By controlling the sludge flow rate and using the sludge-laying component provided in this application to ensure more uniform sludge flow, the overall thickness distribution of the sludge-laying is uniform.

[0078] The method for laying sludge according to this application can evenly distribute sludge on filter cloth.

[0079] The equipment for laying sludge according to this application will be further described below with reference to the accompanying drawings.

[0080] As attached Figure 1 , 2 As shown, the sludge laying component 1 of the sludge laying equipment includes a first component 1-1 and a second component 1-2. Both the first component 1-1 and the second component 1-2 have channels for sludge flow.

[0081] The first end 1-11 of the first component 1-1 is connected to the third component 1-3 for conveying sludge, and the second end 1-12 of the first component 1-1 is connected to the second component 1-2. The other end of the second component 1-2 is provided with a discharge port 1-21, which is arc-shaped and downward-facing. Alternatively, the first and second components can be an integrated structure, or the first, second, and third components can be an integrated structure.

[0082] One specific implementation method is shown in the appendix. Figure 1 As shown, the cross-section of the channel at the first end 1-11 of the first component 1-1 is circular or near-circular, and it is connected to the channel of the third component 1-3. The cross-section at the second end 1-12 of the channel of the first component 1-1 is rectangular. The horizontal direction perpendicular to the sludge flow direction is the width of the channel, and the vertical direction perpendicular to the sludge flow direction is the height of the channel. From the first end 1-11 to the second end 1-12 of the first component 1-1, the width of the channel of the first component 1-1 gradually increases, while the height of the channel gradually decreases. The cross-sectional area of ​​the second end of the channel of the first component 1-1 is 0.7 to 1 times that of the first end.

[0083] In the direction of sludge flow, the ratio of the length of the first component 1-1 to the width of the second end of the first component is 1:0.6 to 1:3, and the ratio of the length of the first component 1-1 to the length of the second component 1-2 is 1:0.5 to 1:8.

[0084] As attached Figure 4 As shown, four sets of sludge-laying components 1 can be arranged side by side inside the housing 11, with the discharge ports 1-21 of the sludge-laying components 1 located on the same straight line. This facilitates uniform distribution of sludge on the filter cloth. The third component 1-3 of the sludge-laying component 1 passes through the second end of the housing, and the discharge port of the second component 1-2 is close to the first end of the housing.

[0085] The structure of housing 11 is shown in the appendix. Figure 4-6 .

[0086] The bottom of the housing 11, near the first end of the housing, is provided with a material spreading port 1121. The discharge port 1-21 of the mud spreading assembly 1 coincides with the material spreading port 1121 in a direction perpendicular to the bottom of the housing. The first end of the housing 11 is provided with a downwardly extending pusher head 113. The first end of the pusher head 113 is connected to the first end of the housing 11. During the pushing process, the second end of the pusher head 113, which is opposite to the first end, is lower than the material spreading port 1121.

[0087] The pusher head 113 can be an integral part of the housing 11; or the pusher head 113 and the housing 11 can be separate parts, and the pusher head 113 can be rotatably connected to the first end of the housing 11 through a connector.

[0088] One structure of the pusher head 113 can be found in the attached document. Figure 5-6 The pusher head 113 includes a pusher column 1134, a back plate, a first support plate 1131, and a second support plate 1132; one end of the first and second support plates is connected to the outer periphery of the pusher column 1134, and the second end is connected to the two opposite sides of the back plate.

[0089] The first and second support plates are tangent to the outer peripheral wall of the pusher column 1134, respectively.

[0090] The pusher post 1134 has a circular or near-circular cross-section, and its diameter is smaller than the distance between the two sides connecting the rear plate and the first and second support plates. This shape of the pusher post increases the strength of the pusher head. The pusher head 1134, thus formed, gradually decreases in height perpendicular to the support plates from the first end to the second end. The shape of the rear plate is consistent with the shape of the first end of the housing.

[0091] In this embodiment, a reinforcing plate 1133 is provided between the two support plates to strengthen the structure of the fabric pusher 113.

[0092] Preferred, such as Figure 6 As shown, in some specific embodiments, the extension length of the second support plate 1132 connected to the pusher post 1134 from below is less than the extension length of the first support plate 1131 connected to the pusher post 1134 from above. The reinforcing plate 1133 connects at both ends to the end of the second support plate 1132 away from the pusher post 1134 and the middle of the first support plate 1131, respectively.

[0093] Of course, the pusher head 113 can also be a solid structure, as long as its cross-section gradually increases from the first end to the second end. That is, the cross-section of the second end, which is in contact with the filter cloth, is the smallest.

[0094] In one embodiment, the pusher head 113 and the housing 11 are separate parts, and the pusher head 113 is rotatably mounted on the first end of the housing 11.

[0095] During the sludge laying process, the pusher head 113 pushes the filter cloth forward, laying it flat on a flat plate. Simultaneously, sludge flows from the laying inlet onto the filter cloth. Once the filter cloth has been laid from one end of the flat plate to the other, the pusher head 113 moves backward, stopping the flow of sludge from the laying inlet during this backward movement. This process is repeated until the pusher head 113 reaches one end of the flat plate, at which point it pushes the cloth again, repeating the above steps. Because no material is laid during the backward movement, it can quickly retract, shortening the laying time for each layer of sludge.

[0096] During the sludge laying process, the pusher column 1134 of the pusher head 113 rotates downward to the second position. The second position is lower than the sludge laying opening, and the distance between the second position and the sludge laying opening is greater than the thickness of the sludge being laid.

[0097] After the filter cloth is laid, when it is moved backward, the pusher head 113 includes a first position where it rotates upward to the upper limit, and the pusher head 113 is in the first position above the upper surface of the sludge.

[0098] In this embodiment, a structure for driving the pusher head 113 to rotate between a first position and a second position can be provided between the pusher head 113 and the housing 11.

[0099] In this embodiment, the fabric pusher head 113 can be driven to rotate by a separate small motor. Alternatively, an elastic element, such as a torsion spring, can be used to drive the fabric pusher head 113 to rotate to the first position.

[0100] In some specific embodiments, the pusher head 113 is mounted on the first end of the housing 11 via a rotating shaft, the axis of which extends laterally perpendicular to the sludge flow direction. A limiting structure is provided between the pusher head 113 and the housing 11 to limit the upper limit position of the pusher head 113's upward rotation and the upper limit position of its downward rotation.

[0101] The limiting structure can be set between the rotating shaft and the bushing on the pusher head 113. The limiting structure has a first limiting structure and a second limiting structure. The first limiting structure limits the upper limit position of the pusher head 113 when it rotates upward, limiting the pusher head 113 to a first position. The second limiting structure limits the upper limit position of the pusher head 113 when it rotates downward, limiting the pusher head 113 to a second position.

[0102] In some other possible embodiments, the rotation of the pusher head 113 can be limited by the front end face of the housing 11. Specifically, the rotating shaft can be positioned between the middle of the first end face of the housing 11 and the pusher head 113, with a gap between the rear plate of the pusher head 113 and the housing 11 for the pusher head 113 to rotate. When the pusher head 113 rotates to the first position, the upper end of the pusher head 113 near the housing 11 abuts against the front end of the housing 11; when the pusher head 113 rotates to the second position, the lower end of the pusher head 113 near the housing 11 abuts against the front end of the housing 11.

[0103] Preferably, in this embodiment, an elastic element is provided between the pusher head 113 and the housing 11. The elastic element drives the pusher head 113 to rotate to a first position. During the forward feeding process of the housing 11, the reaction force exerted by the filter cloth 71 on the pusher head 113 is greater than the elastic force of the elastic element. Driven by the reaction force of the filter cloth 71, the pusher head 113 rotates to a second position. Thus, the pusher head 113 can automatically switch between the first and second positions and can match the pusher head 113's fabric spreading action.

[0104] Alternatively, when the pusher head 113 rotates to the first position, the height of the axis of the pusher column 1134 is lower than the height of the rotation center of the pusher head 113, thereby ensuring that the pusher head 113 can smoothly rotate to the second position under the reaction force of the filter cloth 71.

[0105] Example 1

[0106] This embodiment utilizes the appendix Figure 1 The equipment and method for laying sludge shown are described, wherein the first component 1-1 has a length of 300 mm and a channel cross-sectional area of ​​25 cm² at the first end. 2 The length of the second end is 200mm and the width is 10mm; the length of the second component 1-2 is 330mm.

[0107] The sludge (adhesion stress 600 Pa, water content 82%) was applied at a rate of 0.02 L / (s·cm). 2The flow rate is conveyed through the third component 1-3 to the channels of the first and second components, and can flow out evenly through the outlet of the second component, laying a sludge layer with a thickness of about 10mm on the filter cloth, with the thickness of the sludge on the entire filter cloth varying within 1mm.

[0108] Comparative Example 1

[0109] This comparative example utilizes the appendix Figure 3 Equipment for laying sludge and methods for laying sludge, such as Figure 3 As shown, the cross-sectional area of ​​the first component 1-1' gradually increases along the sludge flow direction. In the vertical plane perpendicular to the sludge flow direction, the height of the channel remains essentially constant, while the width gradually increases in the horizontal direction perpendicular to the sludge flow direction. The first component 1-1' connects to the second component 1-2' at its first end and to the third component 1-3' at its second end. The cross-sectional area of ​​the channel at the first end of the first component 1-1' is 50 cm². 2 The cross-sectional area of ​​the second end is 20cm². 2 The length of the first component 1-1' is 300mm, and the length of the second component 1-2' is 330mm.

[0110] The sludge (adhesion stress 600 Pa, water content 82%) was applied at a rate of 0.02 L / (s·cm). 2 The sludge flow rate is conveyed to the channels of the first and second components through the third component 1-3'. The sludge flow rate is small on both sides of the discharge port of the second component and larger in the middle. The thickness of the sludge laid on the filter cloth is not uniform. The sludge is laid on the filter cloth with a thickness of about 10mm. The sludge on the entire filter cloth varies by 2-3mm.

[0111] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An apparatus for laying sludge, comprising: A mud-laying component is placed inside a housing, and a material-laying port is provided on the bottom surface of the cavity inside the housing. The sludge-laying assembly includes a first assembly and a second assembly, each having a channel. The second end of the second assembly has a discharge port. The second end of the first assembly is connected to the first end of the second assembly, so that the channels of the first assembly and the second assembly are connected. The channel of the second assembly has a cross-section that is a polygon with parallel upper and lower sides and the same cross-section in a direction perpendicular to the direction of sludge movement. The bottom surface of the second assembly that carries the sludge is a plane. The cross-sectional area of ​​the first component channel at the second end is less than or equal to the cross-sectional area at the first end, and the cross-section of the second component channel is the same as the cross-section of the first component channel at the second end. The cross-section of the first component channel at the first end is circular or near-circular; In the first component, from the first end to the second end, the width of its channel gradually increases in the horizontal direction perpendicular to the sludge flow direction, and the height of its channel gradually decreases in the vertical direction perpendicular to the sludge flow direction. The discharge port at the second end of the second component of the mud-laying assembly coincides with the material-laying port in a direction perpendicular to the bottom surface, and the cross-sectional area of ​​the material-laying port is greater than or equal to the cross-sectional area of ​​the discharge port at the second end of the second component. A downwardly extending, rotatable pusher head is provided at the first end of the shell near the material inlet and substantially parallel to the second end of the second component. The first end of the pusher head is connected to the first end of the shell. During the pushing process, the second front end of the pusher head, which is opposite to the first end, is lower than the material inlet. The height difference between the second end of the pusher head and the material inlet is greater than the thickness of the sludge being laid.

2. The apparatus according to claim 1, characterized in that, The first and second components can be integrated as one unit or separate units.

3. The apparatus according to claim 1, characterized in that, The cross-section of the first component channel at the second end is a polygon with parallel sides on both the top and bottom.

4. The apparatus according to claim 1, characterized in that, The cross-section of the first component channel at the second end is rectangular or trapezoidal.

5. The apparatus according to any one of claims 1-4, characterized in that, The cross-sectional area of ​​the first component channel at the second end is 0.7-1.0 times that of the first end.

6. The apparatus according to any one of claims 1-4, characterized in that, The ratio of the length of the first component in the sludge flow direction to the width of the second end of the first component is 1:0.6 to 1:

3.

7. The apparatus according to any one of claims 1-4, characterized in that, In the direction of sludge flow, the ratio of the length L1 of the first component to the length L2 of the second component is 1:0.5 to 1:

8.

8. The apparatus according to claim 1, characterized in that, Multiple mud-laying components are arranged side by side inside the shell; the discharge ports of the second component are on the same straight line.

9. The apparatus according to claim 1, characterized in that, The fabric pusher includes a first position that can be rotated upward to an upper limit and a second position that can be rotated downward to a lower limit; In the first position, the second end of the pusher head is higher than the top surface of the sludge. In the second position, the distance between the second end of the pusher head and the material inlet is greater than the thickness of the sludge.

10. The apparatus according to claim 9, characterized in that, An elastic element is provided between the pusher head and the first end of the housing for driving the pusher head to rotate to the first position.

11. The apparatus according to claim 1, characterized in that, The second end of the pusher head is provided with a pusher column with a circular or near-circular cross-section, and the rear plate of the first end of the pusher head has the same shape as the first end of the shell; The first ends of the first support plate and the second support plate are respectively connected to the outer periphery of the pusher column, and the first support plate and the second support plate are respectively tangent to the outer periphery wall of the pusher column; The second ends of the first and second support plates are connected to the opposite sides of the rear plate.

12. The apparatus according to claim 11, characterized in that, The back plate is basically quadrilateral in shape. In the vertical direction perpendicular to the sludge flow direction, the length of the back plate is less than the diameter of the pusher column.

13. A method for laying sludge using the apparatus for laying sludge according to any one of claims 1-4, comprising: The sludge flows into the channel from the first end of the first component and onto the filter cloth from the outlet of the second component. The adhesion stress of the sludge is 400~1500 Pa, and the water content is 75%-88%. The relationship between the unit flow rate and cross-sectional area of ​​sludge is 0.015~0.04 L / (s·cm). 2 ).

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