Composite filter element for high-pressure-difference dust remover

Abstract

The utility model belongs to the technical field of environmental protection, and relates to a composite filter element for a high-pressure-difference dust remover, which comprises a filter bag (2) arranged on a metal sintering cylinder (1), and is characterized in that a micro-vibration device (6) is arranged in the metal sintering cylinder (1) and comprises a reset spring piece (7) and an impact plate (8), the reset spring piece (7) is mounted on the inner wall of the metal sintering cylinder (1), and the impact plate (8) is mounted on the inner wall of the metal sintering cylinder (1). An impact plate (8) is arranged on the reset spring piece (7); the impact plate (8) is made of PTFE (Polytetrafluoroethylene); the micro-vibration devices (6) are arranged on the inner wall of the metal sintering cylinder (1) in an upper-lower two-layer mode in a staggered and annular mode. Pulse dust cleaning airflow enters the metal sintering cylinder (1) to drive the micro-vibration device (6), so that the impact plate (8) instantly impacts the inner wall of the metal sintering cylinder (1), the whole filter element vibrates, and dust can be well stripped from the surface of a filter bag (2) in cooperation with pulse dust cleaning.

Description

Technical Field

[0001] The utility model belongs to the technical field of environmental protection, is used in a filtering system of a high negative pressure dust collector in an oxygen recovery system of a lithium battery roller kiln, and is specifically a composite filter element for a high pressure difference dust collector. Background Art

[0002] The roller kiln for the production of lithium battery raw materials is equipped with an oxygen recovery system. The oxygen in the roller kiln is collected by the oxygen recovery system and pressurized to 0.4MPa by the oxygen compressor before entering the roller kiln again, forming an oxygen recycling system. The temperature in the roller kiln is around 900℃. The lithium battery raw materials in the kiln produce ultra-fine dust after high-temperature calcination. The dust diameter is between 0.05 microns and 0.1 microns after testing. The dust in the kiln enters the oxygen recovery system along with the oxygen. Dust will greatly reduce the life of the oxygen compressor and even damage the compressor. Therefore, a dust collector is installed on the oxygen recovery system. Through the dust collector, the dust content of the oxygen entering the oxygen compressor is ≤5mg / m³.

[0003] Due to the production process requirements, the pressure inside the roller kiln must be maintained between -15Pa and -2Pa. The oxygen recovery system uses a variable frequency high negative pressure centrifugal fan. The pressure difference of the conventional dust collector is maintained at about 1500Pa. When the oxygen recovery system is operating normally, the pressure difference at the inlet and outlet of the dust collector is about 2500Pa to 3000Pa. As the dust on the outer surface of the dust collector filter increases, the pressure difference of the dust collector is slowly rising. At the same time, the operating temperature of the dust collector is about 230℃.

[0004] At present, the dust collector filter elements that can be used under the above working conditions are membrane filter bags, metal sintered filter cartridges and ceramic fiber filter cartridges. When using membrane filter bags, the filter bags are made of flexible materials and must be used with the internal metal frame. Due to the large pressure difference of the dust collector, the metal frame is made of 4mm steel wire, and the frame spacing is 30mm. The filter bag is easily torn under the condition of high pressure difference for a long time. When using metal sintered filter cartridges or ceramic fiber filter cartridges, the processes of the two cannot cover the surface with ultrafine filter membranes, and the filtration accuracy cannot meet the requirements. The ultrafine dust in the oxygen will directly penetrate the filter element, or even get stuck in the filter element, resulting in a significant increase in the resistance of the dust collector, and it is impossible to use pulse cleaning to clean the dust on the filter element.

[0005] Traditional pulse cleaning uses instantaneous airflow to blow dust off the outer surface of the filter element. However, due to the large pressure difference of the dust collector, the airflow generated by pulse cleaning cannot completely clean the dust on the outer surface of the filter element.

[0006] The bag filter element disclosed in the relevant reference CN201949745U is a plastic filter element covered with filter holes, and the filter bag is a ceramic fiber filter bag. One end of the filter element has a detachable threaded rod connection end. Although it is easy to disassemble and assemble, the dust on the surface of the filter bag cannot be cleaned by itself. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a composite filter element for a high-pressure differential dust collector, which can effectively peel off dust from a filter bag and prevent the filter bag from being torn at the gap under a high-pressure differential condition.

[0008] In order to solve the above technical problems, the utility model provides a composite filter element for a high-pressure differential dust collector, including a filter bag, which is arranged on a metal sintered cylinder. A micro-vibration device is arranged in the metal sintered cylinder, and the micro-vibration device includes a reset spring sheet and an impact plate. The reset spring sheet is installed on the inner wall of the metal sintered cylinder, and an impact plate is arranged on the reset spring sheet; the impact plate is made of PTFE; the micro-vibration device is arranged in an upper and lower two layers in an alternating ring shape on the inner wall of the metal sintered cylinder.

[0009] By adopting the above technical solution, the pulse cleaning airflow enters the metal sintering cylinder, drives the micro-vibration device, and makes the impact plate instantly hit the inner wall of the metal sintering cylinder, causing the entire filter element to vibrate. In combination with pulse cleaning, the dust can be better peeled off the surface of the filter bag. The impact plate is made of PTFE material to avoid sparks when hitting the metal sintering cylinder, eliminating safety hazards.

[0010] Preferably, the surface of the filter bag is coated with a PTFE film.

[0011] By adopting the above technical solution, the filtration accuracy of the filter bag after being covered with PTFE membrane reaches 0.05 microns, the membrane surface is smooth, and the dust stripping efficiency is high.

[0012] Preferably, an outer flange is arranged on the top of the filter bag, and a metal retaining ring is arranged inside the outer flange.

[0013] Preferably, sealing rings are provided on the top opening and the outer flange of the metal sintering cylinder.

[0014] By adopting the above technical solution, after the metal sintered cylinder is placed on the flower plate, the filter bag is pressed tightly under the action of gravity, and at the same time, the sealing retaining ring is pressed tightly to ensure the sealing state of the top of the filter element.

[0015] Preferably, a conical sealing ring is provided between the filter bag and the flower plate.

[0016] By adopting the above technical solution, the conical sealing ring arranged between the flower plate and the filter bag is squeezed under the action of the gravity of the metal sintering cylinder to form a sealed environment, thereby ensuring the sealing of the filter bag.

[0017] Preferably, the sealing baffle ring and the conical sealing ring are both made of silicone rubber.

[0018] By adopting the above technical solution, the silicone rubber sealing ring covers the metal sintering cylinder mouth and the filter bag mouth together to form a seal, and the conical silicone rubber and the flower plate are squeezed due to weight, and the silicone rubber is deformed and sealed.

[0019] Preferably, the metal sintered cylinder is provided with filter holes, and the gap between the filter holes is 0.4-0.6 mm.

[0020] By adopting the above technical solution and using a filter hole gap of 0.4-0.6 mm, it is possible to avoid the filter bag from being torn at the gap under a high pressure difference.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. The pulse cleaning airflow of the utility model enters the metal sintering cylinder, drives the micro-vibration device, and makes the impact plate instantly hit the inner wall of the metal sintering cylinder, so that the whole filter element vibrates, and the pulse cleaning can effectively remove the dust from the surface of the filter bag.

[0023] 2. The impact plate of the utility model is made of PTFE material to avoid sparks when striking the metal sintering cylinder, eliminating safety hazards.

[0024] 3. The gap between the filter holes of the utility model is 0.4-0.6mm, which prevents the filter bag from being torn at the gap under high pressure difference. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the utility model;

[0026] Figure 2 This is a sectional view taken along the AA line of the present invention;

[0027] Figure 3 It is a BB-section view of the utility model;

[0028] Figure 4 This is a schematic diagram of the filter element of the utility model during normal filtering;

[0029] Figure 5 This is a schematic diagram of the filter element of the utility model during normal cleaning.

[0030] Figure number: 1. Metal sintered cylinder, 2. Filter bag, 3. Outer flange, 4. Sealing ring, 5. Metal ring, 6. Micro-vibration device, 7. Reset spring sheet, 8. Impact plate, 9. Conical sealing ring, 10. Flower plate, 11. Filter hole, 12. Rivet. DETAILED DESCRIPTION

[0031] like Figure 1As shown, the composite filter element for high pressure differential dust collector includes a filter bag 2, which is sleeved on a metal sintered cylinder 1. The metal sintered cylinder 1 is a stainless steel metal sintered cylinder, and a filter hole 11 is arranged on the cylinder. The gap of the filter hole 11 is 0.4-0.6mm, so as to prevent the filter bag 2 from being torn at the gap under the condition of high pressure differential. An outer flange 3 is arranged on the top of the filter bag 2, and a metal retaining ring 5 is arranged inside the outer flange 3. A sealing retaining ring 4 is arranged on the top opening and the outer flange 3 of the metal sintered cylinder 1. After the metal sintered cylinder 1 is placed on the flower plate 10, the filter bag 2 is pressed tightly under the action of gravity, and the sealing retaining ring 4 is pressed tightly at the same time.

[0032] A conical sealing ring 9 is arranged between the filter bag 2 and the flower plate 10. The conical sealing ring 9 is squeezed under the gravity of the metal sintered cylinder 1 to form a sealed environment to ensure the sealing of the filter bag 2. The sealing ring 4 and the conical sealing ring 9 are made of silicone rubber. Due to the weight squeezing between the silicone rubber and the flower plate 10, the silicone rubber deforms and seals.

[0033] like Figure 2 , 3 As shown, a micro-vibration device 6 is arranged in the metal sintered tube 1. The micro-vibration device 6 includes a reset spring sheet 7 and an impact plate 8. The reset spring sheet 7 is installed on the inner wall of the metal sintered tube 1, and the impact plate 8 is arranged on the reset spring sheet 7; the reset spring sheet 7 and the impact plate 8 are connected by a stainless steel rivet 12. The impact plate 8 is made of PTFE. The micro-vibration device 6 is arranged in an upper and lower two-layer form on the inner wall of the metal sintered tube 1 in an alternating ring shape. The pulse cleaning airflow enters the metal sintered tube 1, drives the micro-vibration device 6, and makes the impact plate 8 instantly impact the inner wall of the metal sintered tube 1, so that the entire filter element vibrates, and the pulse cleaning can well peel off the dust from the surface of the filter bag 2. The knocking plate is made of PTFE material to avoid sparks when knocking the metal sintered tube 1, eliminating safety hazards.

[0034] The surface of the filter bag 2 is coated with PTFE film, the filtration accuracy reaches 0.05 microns, the membrane surface is smooth, and the dust stripping efficiency is high.

[0035] like Figure 4 As shown, the filter bag 2 is evenly attached to the outside of the metal sintered cylinder 1. During normal operation, the dust 13 on the surface is evenly attached to the metal sintered cylinder 1. The pores of the metal sintered cylinder 1 are about 0.5 mm, which can prevent the filter bag 2 from being torn at the gap under high pressure difference.

[0036] like Figure 5As shown, during pulse cleaning, the airflow enters the filter element, and the filter bag on the outer surface of the filter element expands instantly, shaking off the dust 13 on the outer surface of the filter bag. At the same time, a pneumatic micro-vibration device is provided in the metal sintering cylinder. The pulse cleaning airflow enters the filter element, driving the micro-vibration device 6, allowing the impact plate 8 to instantly impact the inner wall of the metal sintering cylinder 1, causing the entire filter element to vibrate, and the pulse cleaning can better peel off the dust 13 from the surface of the filter bag 2. After cleaning, the reset spring sheet 7 on the micro-vibration device 6 can reset the impact plate 8, ensuring that each pulse cleaning can be repeatedly used.

[0037] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments. Without departing from the principles, the embodiments of the present invention may be deformed or modified in any way.

Claims

1. A composite filter element for a high-pressure differential dust collector, comprising a filter bag (2), the filter bag (2) being arranged on a metal sintered cylinder (1), characterized in that: A micro-vibration device (6) is arranged inside the metal sintering cylinder (1), and the micro-vibration device (6) comprises a reset spring sheet (7) and an impact plate (8), the reset spring sheet (7) is mounted on the inner wall of the metal sintering cylinder (1), and the impact plate (8) is arranged on the reset spring sheet (7); the impact plate (8) is made of PTFE; the micro-vibration device (6) is arranged in an alternating ring shape on the inner wall of the metal sintering cylinder (1) in the form of an upper and a lower layer.

2. A composite filter element for a high pressure differential dust collector according to claim 1, characterized in that: The surface of the filter bag (2) is coated with a PTFE film.

3. A composite filter element for a high pressure differential dust collector according to claim 2, characterized in that: An outer flange (3) is arranged on the top of the filter bag (2), and a metal retaining ring (5) is arranged inside the outer flange (3).

4. A composite filter element for a high pressure differential dust collector according to claim 3, characterized in that: A sealing retaining ring (4) is provided on the top opening and the outer flange (3) of the metal sintering cylinder (1).

5. A composite filter element for a high pressure differential dust collector according to claim 4, characterized in that: A conical sealing ring (9) is provided between the filter bag (2) and the flower plate (10).

6. A composite filter element for a high pressure differential dust collector according to claim 5, characterized in that: The sealing retaining ring (4) and the conical sealing ring (9) are both made of silicone rubber.

7. A composite filter element for a high pressure differential dust collector according to claim 1, characterized in that: The metal sintered cylinder (1) is provided with a filtering hole (11).

8. A composite filter element for a high pressure differential dust collector according to claim 7, characterized in that: The gap between the filter holes (11) is 0.4-0.6 mm.

Images