Piston pusher centrifuge screen for high salinity water
The combined design of inner and outer sieve bodies and filter cloth solves the problems of low solid phase yield and screen wear in piston pusher centrifuges in high-salinity wastewater treatment, achieving more thorough solid-liquid separation and reducing equipment maintenance costs.
Patent Information
- Application Number
- CN202422597364.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-28
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-10-28
AI Technical Summary
When treating high-salinity wastewater, the existing piston pusher centrifuge has low solid phase yield, incomplete separation, severe screen wear, high equipment maintenance cost, and is sensitive to changes in suspension concentration, resulting in vibration and uneven filter cake distribution.
It adopts an inner and outer sieve structure. The inner sieve has sparse sieve holes, while the outer sieve has dense sieve holes. The filter cloth is set between the inner and outer sieves. The filter cloth is made of polypropylene fiber material. The inner sieve rubs against the pusher plate, and the outer sieve serves as a protective layer. The filter cloth improves the solid phase yield and separation efficiency and extends the life of the screen.
It improves the solid-liquid separation efficiency and solid phase yield, reduces the cost of re-evaporation of high-salinity wastewater, extends the service life of the screen, and saves equipment maintenance costs.
Smart Images
Figure CN223299665U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a piston pushing centrifuge screen for high-salt water, belonging to the technical field of high-salt water treatment equipment. Background Art
[0002] Chemical companies generate a large amount of wastewater during the production process. The wastewater has a high salt content, and direct discharge will cause serious pollution to the environment. Therefore, it is necessary to treat the wastewater with a high salt content to reduce the salt content in the wastewater and meet environmental emission requirements. As an effective treatment equipment, the triple-effect high-salinity piston pusher centrifuge can remove a large amount of salt from high-salinity wastewater, so that it meets emission standards and reduces pollution to the environment.
[0003] The piston pusher centrifuge is a high-speed rotating separation mechanism that uses centrifugal force as the driving force to achieve solid-liquid separation. The main motor drives the drum to rotate at full speed, and the wastewater suspension enters the drum continuously and evenly. Under the action of centrifugal force, the liquid phase passes through the screen and the filter holes in the drum wall and is discharged from the drum. The solid phase is trapped in the drum and forms an annular filter cake layer on the surface of the screen. While the pusher plate rotates at the same speed as the drum, it continuously reciprocates axially under the push of the piston, pushing the solid phase forward and pushing it out of the drum mouth, thereby achieving solid-liquid separation. Existing piston pusher centrifuges have the following problems when treating high-salinity wastewater:
[0004] (1) As the solid phase moves forward, it rubs against the metal screen, and a small portion of the solid phase flows out along with the liquid phase through the screen, resulting in a low solid phase yield and incomplete solid-liquid separation.
[0005] (2) It is very sensitive to changes in the solid phase concentration of the wastewater suspension and requires that the solid phase concentration of the suspension be continuously stable. If the solid phase concentration of the suspension becomes thinner (decreases), the filter cake will not have time to form and will wash away the filter cake that has already formed on the screen, resulting in uneven distribution of the filter cake layer and causing strong vibration of the drum. If the solid phase concentration of the suspension suddenly becomes thicker (increases), the fluidity of the suspension is small, which can easily cause uneven distribution of the filter cake layer and cause vibration of the drum. At the same time, the solid phase increases, making it difficult for the push plate to move, which increases the wear of the screen.
[0006] (3) The size and density of the metal screen need to be customized. The larger the density (density) of the metal screen, the more difficult it is to manufacture and the higher the customization cost. After the metal screen is damaged, the cost of replacing the metal screen is relatively high. Utility Model Content
[0007] The purpose of the utility model is to provide a piston pusher centrifuge screen for high-salinity water, which can improve the solid-liquid separation efficiency and solid phase yield when treating high-salinity wastewater, make the solid-liquid separation more thorough, reduce the cost of re-evaporation of high-salinity wastewater, extend the service life of the screen, and save equipment maintenance costs.
[0008] The technical solutions adopted in this utility model are as follows:
[0009] The piston pusher centrifuge screen for high-salt water comprises an inner sieve body, an outer sieve body and a filter cloth. The inner sieve body is a tubular structure, the outer sieve body is wrapped around the outer circumferential surface of the inner sieve body, and the filter cloth is arranged between the inner sieve body and the outer sieve body; the outer sieve body is a sheet structure, the sheet structure outer sieve body is wound into a tubular shape and then wrapped around the outer circumferential surface of the inner sieve body, and the joints of the outer sieve body after being wound into a tubular shape are connected by multiple connecting components; the sieve hole density of the inner sieve body is smaller than the sieve hole density of the outer sieve body.
[0010] As a preferred embodiment of the present invention, the connecting assembly includes a gasket and two screws, and the two screws pass through the gasket and are respectively threadedly connected to the two ends of the outer sieve body at the joint.
[0011] As a preferred embodiment of the present invention, a countersunk hole for accommodating a screw cap is formed on the gasket to prevent the screw cap from protruding from the gasket surface.
[0012] As a preferred embodiment of the present invention, the butt joint surfaces at both ends of the outer sieve body at the joint are mutually matched step surface structures.
[0013] As a preferred embodiment of the present invention, a groove for accommodating a gasket is provided on the end surface of the outer sieve body located on the outside of the joint, and the thickness of the gasket is less than or equal to the depth of the groove, which facilitates the quick and accurate installation of the gasket and prevents the gasket from protruding from the surface of the outer sieve body.
[0014] As a preferred embodiment of the present invention, the gasket is an elliptical structure or a waist-shaped structure, and the shape of the groove is consistent with the shape of the gasket.
[0015] As a preferred embodiment of the present invention, the front edge of the filter cloth is folded inward to wrap the end of the inner sieve body, and the front edge of the outer sieve body is folded inward to wrap the inner sieve body and the end of the filter cloth.
[0016] As a preferred embodiment of the present invention, the filter cloth is made of polypropylene fiber material; polypropylene fiber material has good chemical corrosion resistance and good resistance to acids and alkalis, and meets the material requirements for filtering high-salinity wastewater.
[0017] The utility model is beneficial in that:
[0018] (1) A filter cloth is set between the inner sieve body and the outer sieve body to participate in the filtration. The pore density of the filter cloth is larger, which effectively prevents the solid phase from flowing out with the liquid phase, improves the solid phase yield and solid-liquid separation efficiency, makes the solid-liquid separation more thorough, and reduces the cost of re-evaporation of high-salinity wastewater; at the same time, the presence of the filter cloth can make the filter cake easier to form, avoiding the problem of uneven distribution of the filter cake layer due to the sudden dilution of the solid phase concentration of the wastewater suspension, which prevents the filter cake from forming in time and washing away the formed filter cake.
[0019] (2) The mesh density of the outer sieve body is large (the mesh is dense), so the outer sieve body serves as the core screen. The mesh density of the inner sieve body is small (the mesh is sparse), so the inner sieve body serves as the auxiliary screen. The push plate always rubs against the inner sieve body during the axial reciprocating motion, and the solid phase only rubs against the inner sieve body during the forward movement. Therefore, the outer sieve body is well protected, thereby extending the service life of the outer sieve body, that is, extending the service life of the screen. At the same time, since the customization cost of the outer sieve body is high (because the mesh density of the outer sieve body is large and it is not easy to manufacture), and the customization cost of the inner sieve body is relatively low (because the mesh density of the inner sieve body is small and it is easy to manufacture), the replacement cost of the inner sieve body after wear is lower, which effectively saves equipment maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the structure of the utility model;
[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the utility model;
[0022] Figure 3 yes Figure 2 A is an enlarged schematic diagram;
[0023] Figure 4 It is a cross-sectional schematic diagram of the joint of the outer screen body of the utility model;
[0024] Figure 5 It is a cross-sectional schematic diagram of the outer sieve body connection assembly of the utility model.
[0025] The meaning of the reference numerals in the figures:
[0026] 1-Inner sieve body, 2-Outer sieve body, 3-Filter cloth, 4-Gasket, 5-Screw. DETAILED DESCRIPTION
[0027] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0028] like Figure 1-5As shown, this embodiment is a piston pusher centrifuge screen for high-salt water, comprising an inner sieve body 1, an outer sieve body 2 and a filter cloth 3. The inner sieve body 1 is a tubular structure, the outer sieve body 2 is wrapped around the outer circumference of the inner sieve body 1, and the filter cloth 3 is arranged between the inner sieve body 1 and the outer sieve body 2; the outer sieve body 2 is a sheet structure, the sheet structure outer sieve body 2 is wound into a tubular shape and then wrapped around the outer circumference of the inner sieve body 1, and the joints of the outer sieve body 2 after being wound into a tubular shape are connected by multiple connecting components; the sieve hole density of the inner sieve body 1 is smaller than the sieve hole density of the outer sieve body 2.
[0029] The connecting assembly of this embodiment includes a gasket 4 and two screws 5. The two screws 5 pass through the gasket 4 and are respectively threadedly connected to the two ends of the outer sieve body 2 at the joint; the joint of the outer sieve body 2 after being rolled into a tubular shape is connected by multiple connecting assemblies to form a detachable connection relationship, which is convenient for later replacement of the filter cloth 3; a countersunk hole for accommodating the nail cap of the screw 5 is formed on the gasket 4 to prevent the nail cap of the screw 5 from protruding from the surface of the gasket 4.
[0030] In this embodiment, the butt joint surfaces at both ends of the outer sieve body 2 at the joint are mutually matched step surface structures, such as Figure 4 and 5 As shown; the end surface of the outer sieve body 2 located on the outside of the joint is provided with a groove for accommodating the gasket 4, and the thickness of the gasket 4 is equal to the depth of the groove. Of course, in actual application, the thickness of the gasket 4 can also be less than the depth of the groove, which is convenient for quick and accurate installation of the gasket 4 and avoids the gasket 4 protruding from the surface of the outer sieve body 2; the gasket 4 in this embodiment is an elliptical structure. In actual application, the gasket 4 can also adopt a waist-shaped structure, and the shape of the groove is consistent with the shape of the gasket 4.
[0031] In this embodiment, the front edge of the filter cloth 3 is folded inward to wrap the end of the inner sieve body 1, and the front edge of the outer sieve body 2 is folded inward to wrap the end of the inner sieve body 1 and the filter cloth 3. Figure 3 shown.
[0032] The filter cloth 3 in this embodiment is made of polypropylene fiber material; polypropylene fiber material has good chemical corrosion resistance and good resistance to acid and alkali, and meets the material requirements for filtering high-salinity wastewater.
[0033] When in use, this embodiment is installed inside the drum of a piston-pushing centrifuge. The wastewater suspension enters the drum continuously and evenly. Under the centrifugal force of the rotating drum, the liquid phase passes through the inner sieve body 1, the filter cloth 3, the outer sieve body 2 and the filter holes on the drum wall in sequence and is discharged from the drum. The solid phase is retained in the drum and forms an annular filter cake layer on the surface of the inner sieve body 1. While the pusher plate rotates at the same speed as the drum, it continuously reciprocates axially under the push of the piston, pushing the solid phase forward and pushing the solid phase out of the drum mouth, thereby achieving solid-liquid separation.
[0034] In this embodiment, a filter cloth 3 is provided between the inner sieve body 1 and the outer sieve body 2 to participate in the filtration. The pore density of the filter cloth 3 is greater, which effectively prevents the solid phase from flowing out with the liquid phase, thereby improving the solid phase yield and the solid-liquid separation efficiency, making the solid-liquid separation more thorough, and reducing the cost of re-evaporation of high-salinity wastewater; at the same time, the presence of the filter cloth 3 can make it easier to form a filter cake, avoiding the problem of uneven distribution of the filter cake layer due to the sudden dilution of the solid phase concentration of the wastewater suspension, which prevents the filter cake from forming in time and washing away the formed filter cake.
[0035] In this embodiment, the sieve hole density of the outer sieve body 2 is large (the sieve holes are dense), so the outer sieve body 2 serves as the core screen, and the sieve hole density of the inner sieve body 1 is small (the sieve holes are sparse), so the inner sieve body 1 serves as an auxiliary screen, and the pushing plate always rubs against the inner sieve body 1 during the axial reciprocating motion, and the solid phase only rubs against the inner sieve body 1 during the forward movement. Therefore, the outer sieve body 2 is well protected, thereby extending the service life of the outer sieve body 2, that is, extending the service life of the screen; at the same time, since the customization cost of the outer sieve body 2 is high (because the sieve hole density of the outer sieve body 2 is large and it is not easy to manufacture), and the customization cost of the inner sieve body 1 is relatively low (because the sieve hole density of the inner sieve body 1 is small and it is easy to manufacture), the replacement cost of the inner sieve body 1 after wear is lower, effectively saving equipment maintenance costs.
[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.
[0037] In the description of the present invention, it should be noted that: unless otherwise clearly stipulated and limited, the terms "install", "connect", "set", and "form" should be understood in a broad sense; for example: it can be a fixed connection, setting, or a detachable connection, setting, or an integrated structure; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two elements; for those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.
[0038] In the description of the present invention, reference to terms such as "embodiment", "specific example" or "practical application" means that the specific features, structures, materials or characteristics described in combination with the embodiment are included in at least one embodiment or example of the present invention; the schematic expressions of the above terms do not necessarily refer to the same embodiment or example, and the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.
[0039] The above embodiments are only used to illustrate the technical solutions of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form. Any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of the present invention.
Claims
1. Piston pusher centrifuge screen for high brine, characterized by: It includes an inner sieve body, an outer sieve body and a filter cloth. The inner sieve body is a tubular structure, the outer sieve body is wrapped on the outer circumferential surface of the inner sieve body, and the filter cloth is arranged between the inner sieve body and the outer sieve body; the outer sieve body is a sheet structure, and the sheet structure outer sieve body is rolled into a tubular shape and wrapped on the outer circumferential surface of the inner sieve body. The joints of the outer sieve body after being rolled into a tubular shape are connected by multiple connecting components; the sieve hole density of the inner sieve body is smaller than the sieve hole density of the outer sieve body.
2. The piston pusher centrifuge screen for high brine according to claim 1, characterized in that: The connecting assembly includes a gasket and two screws. The two screws pass through the gasket and are respectively threadedly connected to the two ends of the outer sieve body at the joint.
3. The piston pusher centrifuge screen for high brine according to claim 2, characterized in that: The gasket is formed with a countersunk hole for accommodating a screw cap.
4. The piston pusher centrifuge screen for high brine according to claim 2 or 3, characterized in that: The butt joint surfaces at both ends of the outer sieve body at the joint are mutually matched step surface structures.
5. The piston pusher centrifuge screen for high brine according to claim 4, characterized in that: The end surface of the outer sieve body located on the outside of the joint is provided with a groove for accommodating a gasket, and the thickness of the gasket is less than or equal to the depth of the groove.
6. The piston pusher centrifuge screen for high brine according to claim 5, characterized in that: The gasket is an oval structure or a waist-shaped structure, and the shape of the groove is consistent with the shape of the gasket.
7. The piston pusher centrifuge screen for high brine according to claim 1, characterized in that: The front side edge of the filter cloth is folded inward to wrap the end of the inner sieve body, and the front side edge of the outer sieve body is folded inward to wrap the inner sieve body and the end of the filter cloth.
8. The piston pusher centrifuge screen for high brine according to claim 1, characterized in that: The filter cloth is made of polypropylene fiber material.