Filter element type closed filter and use method thereof

Abstract

The invention provides a filter element type closed filter and a using method thereof.The filter element type closed filter comprises a vertically-arranged barrel, the two ends of the barrel are connected with an upper sealing head and a lower sealing head respectively, an upper hanging plate and a lower hanging plate are arranged at the two ends in the barrel respectively, and a filter element of a hollow structure is installed between the upper hanging plate and the lower hanging plate; the two ends of the filter element are communicated with the upper sealing head and the lower sealing head respectively, micropores located between the upper hanging plate and the lower hanging plate are further formed in the circumferential wall of the filter element, a feeding pipe and a slurry discharging pipe are further connected to the barrel, and the feeding pipe and the slurry discharging pipe are communicated with the space between the upper hanging plate and the lower hanging plate respectively. An upper outlet pipe and a lower outlet pipe are connected to the upper end socket and the lower end socket respectively, and an atomizer is connected to the upper end socket. The problems that in the prior art, impurity residues exist in the filter element regeneration process, and high-pressure gas greatly impacts the filter element, so that the operation and maintenance cost is increased are solved.

Description

Technical Field

[0001] This invention relates to the field of cartridge-type sealed filter equipment technology, and in particular to a cartridge-type sealed filter and its usage method. Background Technology

[0002] Cartridge-type closed filtration devices, especially cartridge-type closed filters, are highly efficient, energy-saving, and closed-loop liquid-solid or gas-solid separation equipment, widely used in industrial fields where liquid-solid or gas-solid separation is performed under closed conditions. In existing technologies, cartridge-type closed filters become clogged or fail after a period of use due to excessive impurities trapped within the micropores of the filter element, thus requiring regeneration. Regeneration is generally carried out using high-pressure backflushing, where high-pressure gas is used as the medium to backflush the filter element, blowing out impurities from the micropores. These blown-out impurities remain inside, requiring disassembly and cleaning, which is time-consuming and labor-intensive. Furthermore, the high-pressure gas exerts a significant impact on the filter element during regeneration, shortening its lifespan and increasing operating and maintenance costs. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a cartridge-type sealed filter, which solves the problems of impurities remaining during the cartridge regeneration process and the increased operating and maintenance costs caused by the significant impact of high-pressure gas on the cartridge.

[0004] According to an embodiment of the present invention, a cartridge-type sealed filter includes a vertically arranged cylinder with an upper end cap and a lower end cap connected to both ends of the cylinder. An upper hanging plate and a lower hanging plate are respectively provided at both ends of the cylinder. A hollow filter element is installed between the upper and lower hanging plates, with both ends of the filter element communicating with the upper and lower end caps. Micropores are also provided on the peripheral wall of the filter element between the upper and lower hanging plates. A feed pipe and a discharge pipe are also connected to the cylinder, communicating with the space between the upper and lower hanging plates and being located close to them. An upper outlet pipe and a lower outlet pipe are respectively connected to the upper and lower end caps. An atomizer is also connected to the upper end cap, and the atomizer is provided with a first pressurized air inlet valve, a flushing liquid inlet valve, and an atomized gas outlet pipe connected to the upper end cap. This solution uses an atomizer to form an atomized liquid, which is then used to backwash the filter element. During the backwashing process, the atomized liquid and impurities form a flowing slurry that is discharged through the slurry drain pipe. This avoids impurities remaining inside the filter element, eliminates the need for disassembly and cleaning, and minimizes the impact on the filter element. As a result, it has lower operating and maintenance costs and solves the problems of impurities remaining during filter element regeneration and the increased operating and maintenance costs caused by the large impact of high-pressure gas on the filter element in existing technologies.

[0005] Furthermore, the lower outlet pipe is connected at the lowest point of the lower end cap.

[0006] Furthermore, the atomizer includes one of the following: a two-fluid atomizing nozzle, an ultrasonic atomizer, a vortex atomizer, or a rotary disc atomizer.

[0007] Furthermore, the upper end cap and the cylinder are detachably connected by a first connecting ring and a second connecting ring, and the lower end cap and the cylinder are detachably connected by a third connecting ring and a fourth connecting ring.

[0008] Furthermore, the upper mounting plate and the cylinder are either integrally fixed or detachably fixed.

[0009] Furthermore, the lower mounting plate and the cylinder are either integrally fixed or detachably fixed.

[0010] Furthermore, a baffle plate extending downwards is connected to the upper hanging plate, and the connection between the feed pipe and the cylinder is directly opposite the baffle plate.

[0011] Furthermore, the feed pipe is also connected to a secondary slurry valve.

[0012] Furthermore, the feed pipe is also connected to a feed valve and a second pressurized air inlet valve, and the upper outlet pipe, lower outlet pipe and slurry discharge pipe are respectively equipped with an upper outlet valve, a lower outlet valve and a slurry discharge valve.

[0013] According to the embodiment, a method for using the above-mentioned cartridge-type sealed filter is also provided: open the feed valve and the top outlet valve to start filtration; after filtration, close the feed valve and the top outlet valve, open the second pressurized air inlet valve and the bottom outlet valve to start forward blowing; close the second pressurized air inlet valve and the bottom outlet valve, open the first pressurized air inlet valve, the flushing fluid inlet valve and the slurry discharge valve to start backflushing and collect secondary slurry through the slurry discharge pipe; close the first pressurized air inlet valve and the flushing fluid inlet valve, open the bottom outlet valve to discharge the liquid from the lower end cap, and then close the bottom outlet valve and the slurry discharge valve.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The atomizer uses flushing fluid and pressurized gas to form an atomized liquid, which is then used to backwash the filter element. During the backwashing process, the atomized liquid and impurities form a flowing slurry that is discharged through the slurry drain pipe. This avoids impurities remaining inside the filter element, eliminates the need for disassembly and cleaning, and reduces the impact on the filter element. As a result, it has lower operating and maintenance costs and solves the problems of impurities remaining during filter element regeneration and the increased operating and maintenance costs caused by the large impact of high-pressure gas on the filter element in existing technologies. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0017] In the above attached figures:

[0018] 1. Cylinder body; 2. Upper end cap; 3. Lower end cap; 4. First connecting ring; 5. Second connecting ring; 6. Third connecting ring; 7. Fourth connecting ring; 8. Upper hanging plate; 9. Lower hanging plate; 10. Filter element; 11. Feed pipe; 12. Slurry discharge pipe; 13. Upper outlet pipe; 14. Lower outlet pipe; 15. Atomizer; 16. First pressurized air inlet valve; 17. Flushing liquid inlet valve; 18. Atomized gas outlet pipe; 19. Feed valve; 20. Second pressurized air inlet valve; 21. Upper outlet valve; 22. Lower outlet valve; 23. Slurry discharge valve; 24. Secondary slurry valve; 25. Baffle plate. Detailed Implementation

[0019] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] In an exemplary implementation, such as Figure 1As shown, this embodiment provides a cartridge-type sealed filter, which includes a vertically arranged cylindrical body 1. An upper end cap 2 and a lower end cap 3 are detachably connected to both ends of the cylindrical body 1. Specifically, the upper end cap 2 and the cylindrical body 1 are detachably connected via a first connecting ring 4 and a second connecting ring 5, and the lower end cap 3 and the cylindrical body 1 are detachably connected via a third connecting ring 6 and a fourth connecting ring 7. The detachable connection between the first connecting ring 4 and the second connecting ring 5, and between the third connecting ring 6 and the fourth connecting ring 7, can be achieved by bolts. Further, an upper hanging plate 8 and a lower hanging plate 9 are respectively provided at both ends inside the cylindrical body 1. The upper hanging plate 8 and the lower hanging plate 9 are respectively provided with mounting holes, and the mounting holes on the upper hanging plate 8 and the lower hanging plate 9 are aligned facing each other. A hollow filter element 10 is installed between the mounting holes. The two ends of the filter element 10 are connected to the upper end cap 2 and the lower end cap 3, respectively. Microholes are also provided on the peripheral wall of the filter element 10 between the upper hanging plate 8 and the lower hanging plate 9. Multiple sets of mounting holes and corresponding filter elements 10 can be provided, and adjustments can be made according to specific circumstances. Furthermore, a feed pipe 11 and a discharge pipe 12 are connected to the cylinder 1. The feed pipe 11 and the discharge pipe 12 are connected to the space between the upper hanging plate 8 and the lower hanging plate 9, respectively, and are positioned close to the upper hanging plate 8 and the lower hanging plate 9. An upper outlet pipe 13 and a lower outlet pipe 14 are also connected to the upper end cap 2 and the lower end cap 3, respectively. The upper end cap 2 and the lower end cap 3 are generally arc-shaped, and the outlet pipes are connected to the lower end cap 2. The lowest point of the lower head 3 allows for easy drainage of all liquid within the lower head 3. An atomizer 15 is connected to the upper head 2, equipped with a first pressurized air inlet valve 16, a flushing liquid inlet valve 17, and an atomized gas outlet pipe 18. The atomized gas outlet pipe 18 connects to the upper head 2. A feed pipe 11 is also connected to a feed valve 19 and a second pressurized air inlet valve 20. The feed valve 19 is used to introduce the raw material to be filtered, which can be a slurry or a gaseous material containing solid particulate impurities, such as a mixture of silica and fluorosilicic acid, or a mixture of dust and air. The first pressurized air inlet valve 16 and the second pressurized air inlet valve 20 can share a pressurized gas source (for outputting pressurized gas at approximately 200 kPa) and can be connected via branch pipes. Alternatively, each gas source can be independent. The gas can be air, nitrogen, or other common gases. The flushing fluid inlet valve 17 is connected to the flushing fluid source to introduce the flushing fluid, which can be water. The flushing fluid and pressurized gas are introduced into the atomizer 15 to form atomized gas, which then enters the upper end cap 2 and then the filter element 10 below. More specifically, the atomizer 15 can be a two-fluid atomizing nozzle, an ultrasonic atomizer, a vortex atomizer, a rotary disc atomizer, or other devices that can mix the flushing fluid and gas to form atomized gas. The upper outlet pipe 13, the lower outlet pipe 14, and the slurry discharge pipe 12 are respectively equipped with an upper outlet valve 21, a lower outlet valve 22, and a slurry discharge valve 23 to control their on / off states.

[0022] This embodiment also provides a method for using the above-mentioned closed filter element 10. During filtration, the inlet valve 19 and the top outlet valve 21 are opened, and the material to be filtered (such as a mixture of silica and fluorosilicic acid, or a mixture of dust and air) is introduced into the cylinder 1 through the inlet pipe 11. The material passes through the micropores on the filter element 10 and enters the hollow structure of the filter element 10, then rises into the upper end cap 2, and is then discharged through the top outlet pipe 13 to obtain the filtered product (such as fluorosilicic acid or air). The top outlet pipe 13 can be connected to the upper end cap 2 or to the cylinder 1, preferably as close as possible to the upper wall of the upper hanging plate 8, so as to allow for a greater introduction of the filtered liquid product. After one batch of filtration, a filter cake will form on the surface of the filter element 10. After cleaning, the next batch of filtration is carried out. Specifically: first, the feed valve 19 and the upper outlet valve 21 are closed to stop feeding and product discharge. Then, the second pressurized air inlet valve 20 and the lower outlet valve 22 are opened. The second pressurized air inlet valve 20 introduces gas and blows it into the cylinder 1. This allows the liquid components on the filter cake to migrate inward to the micropores and then into the filter element 10, and then be discharged through the lower outlet pipe 14 (after closing the upper outlet pipe 13, opening the lower outlet pipe 14 will also discharge some liquid from the filter element 10 and the upper end cap 2). This gas blows from the cylinder 1 into the filter element 10, which is a forward blowing process. When the liquid output from the lower outlet pipe 14 is small (or no longer), the next step, backflushing, can be carried out. Specifically, the second pressurized air inlet valve 20 and the lower outlet valve 22 are closed. 22. Stop the forward blowing, open the first pressurized air inlet valve 16, the flushing liquid inlet valve 17, and the slurry discharge valve 23. The gas and flushing liquid form atomized gas in the atomizer 15, then enter the upper end cap 2 and continue downward into the filter element 10. The flushing liquid contained in the atomized gas enters the filter element 10 along with the atomized gas and enters each micropore from the inside out, then passes through the micropores to wet the filter cake. Subsequently, the filter cake collapses outward onto the lower hanging plate 9 at the lower end of the cylinder 1. Then, with the back blowing, the atomized gas can further carry out impurities in the micropores. As the flushing liquid increases, the collapsed filter cake will form slurry in the cylinder 1 and be discharged from the slurry outlet pipe. The discharged material is secondary slurry. Then, close the first pressurized air inlet valve 16 and the flushing liquid inlet valve 17, and open the lower outlet valve 22. Drain the liquid from the lower end cap 3, then close the lower outlet valve 22 and the slurry discharge valve 23. If all the filter cake and impurities in the cylinder 1 can be discharged as secondary slurry, then the next batch of filtration can be carried out (this can be observed through the viewing window on the cylinder 1, or by observing whether the secondary slurry has become clear). Otherwise, the secondary slurry (water can also be used, but using secondary slurry can save a lot of water resources; water can also be added to the secondary slurry to reduce the solid content before introduction, which is more effective and also saves some water resources) can be used for rinsing again. Specifically, a secondary slurry valve 24 is also connected to the feed pipe 11. First, close the slurry discharge valve 23, so that there is still a small amount of residual liquid in the lower end cap 3, filter element 10, and the lower end of the cylinder 1.Then, close the first pressurized air inlet valve 16 and the flushing liquid inlet valve 17 to stop the introduction of atomizing gas. This prevents impurities and secondary slurry from entering the micropores in large quantities and causing blockage in subsequent processes. Then, open the secondary slurry valve 24 and introduce the collected secondary slurry into the cylinder 1 through the feed pipe 11. The secondary slurry carries away the residual filter cake and impurities from the slurry outlet pipe. Then, close the secondary slurry valve 24 and the discharge valve 23. Finally, open the lower outlet valve 22 and close it after the liquid in the lower end cap 3 has been discharged. The next batch of filtration can then begin.

[0023] In this design, the filter element 10 is a sintered filter element 10, more specifically, a PTFE sintered filter element 10, or alternatively, a 316L stainless steel sintered filter element 10, or other similar sintered filter elements 10. Mounting holes are provided on the upper hanging plate 8 and lower hanging plate 9 to secure both ends of the filter element 10, thus improving its stability and extending its service life. More specifically, a baffle plate 25 extending downwards from the upper hanging plate 8 is connected to the lower hanging plate 9. The connection point between the feed pipe 11 and the cylinder 1 is directly opposite the baffle plate 25. When the material is introduced (or secondary slurry), it will not directly hit the filter element 10, which is conducive to the formation of filter cake. At the same time, it also reduces the lateral stress on the filter element 10, thus enhancing the stability of the filter element 10. More specifically, the side of the baffle plate 25 facing the feed pipe 11 can also be set as an incline, with the higher side of the incline close to the feed pipe 11 and the lower side away from the feed pipe 11. The connection between the feed pipe 11 and the cylinder 1 is also directly opposite the upper or middle of the incline. In this way, when the material or secondary slurry enters the cylinder 1, it can be guided downwards under the action of the incline, and enter the cylinder 1 more smoothly.

[0024] Furthermore, in this design, the upper hanging plate 8 and the lower hanging plate 9 can be integrally fixed to the inner wall of the cylinder 1, which can improve mechanical strength, or they can be detachably fixed.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A cartridge-type sealed filter, characterized in that, The device includes a vertically oriented cylindrical body, with an upper end cap and a lower end cap connected to both ends of the cylindrical body. An upper hanging plate and a lower hanging plate are respectively installed at both ends of the cylindrical body. A hollow filter element is installed between the upper and lower hanging plates, with both ends of the filter element communicating with the upper and lower end caps. Micropores are also provided on the peripheral wall of the filter element between the upper and lower hanging plates. A feed pipe and a discharge pipe are connected to the cylindrical body, communicating with the space between the upper and lower hanging plates and positioned close to them. An upper outlet pipe and a lower outlet pipe are respectively connected to the upper and lower end caps. An atomizer is also connected to the upper end cap, and the atomizer is equipped with a first pressurized air inlet valve, a flushing liquid inlet valve, and an atomized gas outlet pipe, which is connected to the upper end cap.

2. The cartridge-type sealed filter as described in claim 1, characterized in that, The lower outlet pipe is connected to the lowest point of the lower end cap.

3. The cartridge-type sealed filter as described in claim 1, characterized in that, The atomizer includes one of the following: a two-fluid atomizing nozzle, an ultrasonic atomizer, a vortex atomizer, and a rotary disc atomizer.

4. The cartridge-type sealed filter as described in claim 1, characterized in that, The upper end cap and the cylinder are detachably connected by a first connecting ring and a second connecting ring, and the lower end cap and the cylinder are detachably connected by a third connecting ring and a fourth connecting ring.

5. The cartridge-type sealed filter as described in claim 1, characterized in that, The upper hanging plate is either integrally fixed to the cylinder or detachably fixed.

6. The cartridge-type sealed filter as described in claim 1, characterized in that, The lower hanging plate is either integrally fixed to the cylinder or detachably fixed.

7. The cartridge-type sealed filter as described in claim 1, characterized in that, The upper hanging plate is also connected to a baffle plate extending to the lower hanging plate, and the connection between the feed pipe and the cylinder body is directly opposite the baffle plate.

8. The cartridge-type sealed filter as described in any one of claims 1-7, characterized in that, The feed pipe is also connected to a secondary slurry valve.

9. The cartridge-type sealed filter as described in claim 8, characterized in that, The feed pipe is also connected to a feed valve and a second pressurized air inlet valve. The upper outlet pipe, the lower outlet pipe and the slurry discharge pipe are respectively equipped with an upper outlet valve, a lower outlet valve and a slurry discharge valve.

10. A method of using the cartridge-type sealed filter as described in claim 9, characterized in that, Open the feed valve and the top outlet valve to begin filtration; after filtration, close the feed valve and the top outlet valve, open the second pressurized air inlet valve and the bottom outlet valve to begin forward blowing; close the second pressurized air inlet valve and the bottom outlet valve, open the first pressurized air inlet valve, the flushing fluid inlet valve, and the slurry discharge valve to begin backflushing and collect secondary slurry through the slurry discharge pipe; close the first pressurized air inlet valve and the flushing fluid inlet valve, open the bottom outlet valve to discharge the liquid from the lower end cap, and then close the bottom outlet valve and the slurry discharge valve; if there are still impurities in the cylinder, open the secondary slurry valve to introduce secondary slurry and continue to use the secondary slurry to remove the impurities from the slurry discharge pipe, and then close the secondary slurry valve and the slurry discharge valve.

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