An ultra-low emission dust removal filter cartridge for aluminum industry

Abstract

This utility model discloses an ultra-low emission dust collector filter cartridge for the aluminum industry, including a connecting cylinder, a top cover, and a bottom cover. The connecting cylinder and the top cover are rotatably connected. An inner support hollow cylinder is fixed between the top cover and the bottom cover. A filter element is sleeved on the outside of the inner support hollow cylinder. An air port is opened at the center of the connecting cylinder, the top cover, and the bottom cover. A one-way valve is installed in the air port of the bottom cover. An impeller is fixed on the top of the one-way valve at the air port of the bottom cover. During the pulse cleaning process, the centrifugal force generated by the overall rotation of the filter cartridge effectively reduces the secondary adsorption of the shaken dust, making the dust fall into the ash hopper more easily, significantly improving the cleaning efficiency, and solving the problem of fine dust re-adhesion due to its light weight and slow settling in the prior art. At the same time, due to the improved cleaning effect, the surface of the filter element is less likely to be blocked too quickly due to dust accumulation, reducing system resistance, reducing the replacement frequency of the filter cartridge, extending the service life of the filter cartridge, and reducing the operating costs of enterprises.

Description

Technical Field

[0001] This utility model belongs to the technical field of cartridge dust collectors, specifically relating to an ultra-low emission dust collection cartridge for the aluminum industry. Background Technology

[0002] In the processes of aluminum smelting, processing, and recycled aluminum production, high-temperature smelting, refining, and material conveying generate a large amount of highly dispersed dust. To meet increasingly stringent environmental emission standards, the aluminum industry generally adopts cartridge dust collectors as the core purification equipment. Due to their high filtration accuracy, small footprint, and ultra-low emission characteristics with stable emission concentrations below 10 mg / Nm³, they have become the industry's preferred choice.

[0003] The core function of existing dust collector filter cartridges used in the aluminum industry is to filter dust-laden gas and, when necessary, remove dust from the filter element surface via pulse jet cleaning. However, in actual operation, especially when dealing with the fine particulate dust unique to the aluminum industry, the high-pressure gas used in pulse cleaning instantly backwashes the filter element. The dust that should fall into the ash hopper under gravity, but because the filter element is stationary during the pulse cleaning process, some fine dust particles, after detaching from the filter element, settle slowly due to their light weight, causing them to re-adhere to the filter element surface or adjacent filter cartridges. This reduces cleaning efficiency, and over time, it increases system resistance, affecting filtration efficiency and filter cartridge lifespan.

[0004] Therefore, this utility model proposes a dust removal filter cartridge structure that can effectively improve the pulse cleaning effect and prevent secondary dust adsorption, so as to meet the needs of the aluminum industry for continuous and stable emission compliance and energy conservation and consumption reduction. Utility Model Content

[0005] To achieve the above objectives, this utility model provides the following technical solution: an ultra-low emission dust removal filter cartridge for the aluminum industry, comprising a connecting cylinder, a top cover, and a bottom cover. The connecting cylinder and the top cover are rotatably connected at the top. An inner support hollow cylinder is fixed between the top cover and the bottom cover. A filter element is sleeved on the outside of the inner support hollow cylinder. An air port is provided at the center of the connecting cylinder, the top cover, and the bottom cover. A one-way valve is installed inside the air port of the bottom cover. An impeller is fixed on top of the one-way valve at the air port of the bottom cover.

[0006] As a preferred embodiment of this utility model, the rotating connection between the top cover and the connecting cylinder adopts a mechanical dynamic sealing structure.

[0007] As a preferred technical solution of this utility model, the air ports at the center of the connecting cylinder, the top cover and the bottom cover, as well as the impeller and the one-way valve are arranged in a collinear manner.

[0008] As a preferred technical solution of this utility model, the filter element is a cylindrical structure formed by folding and winding a continuous sheet.

[0009] As a preferred embodiment of this utility model, the top cover and bottom cover are provided with annular grooves at the outer edge of the air inlet, and the upper and lower ends of the filter element are respectively placed in the annular grooves of the top cover and bottom cover.

[0010] As a preferred technical solution of this utility model, the inner walls of the annular grooves of the top cover and the bottom cover are integrally connected with multiple partitions. The multiple partitions are arranged circumferentially around the air inlet along the inner wall of the annular groove, and the partitions are placed in the folds formed by folding the filter element.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] (1) During the pulse cleaning process, the centrifugal force generated by the overall rotation of the filter cartridge effectively reduces the secondary adsorption of the shaken dust, making the dust easier to fall into the ash hopper, significantly improving the cleaning efficiency and solving the problem of fine dust re-attaching due to its light weight and slow settling in the existing technology; at the same time, due to the improved cleaning effect, the filter element surface is less likely to be blocked too quickly due to dust accumulation, reducing system resistance, reducing the replacement frequency of the filter cartridge, extending the service life of the filter cartridge, and reducing the operating cost of the enterprise.

[0013] (2) The adoption of mechanical dynamic sealing structure effectively prevents gas leakage, ensures the sealing performance of the filter cartridge in both rotating and stationary states, ensures the stable operation of the filter cartridge dust collector, and reduces the risk of environmental pollution caused by leakage. The setting of annular grooves and separators on the top and bottom covers ensures the normal spacing of the filter element pleats, and improves the stability and filtration performance of the filter element. The collinear setting of the air ports, impellers and check valves of each component ensures smooth airflow and improves energy utilization efficiency. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 3 This is a structural schematic diagram of the present invention from one angle (with the one-way valve removed).

[0018] Figure 4 This is a structural schematic diagram of the present invention from another angle;

[0019] Figure 5 This is a schematic diagram of the structure of the bottom cover of this utility model;

[0020] Figure 6 This is a top view of the filter element in this utility model;

[0021] In the diagram: 1. Connecting cylinder; 2. Top cover; 3. Bottom cover; 4. Inner support hollow cylinder; 5. Filter element; 6. Air port; 7. One-way valve; 8. Impeller; 9. Annular groove; 10. Separator. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example

[0024] Please see Figure 1-6 The present invention provides the following technical solution: an ultra-low emission dust removal filter cartridge for the aluminum industry, comprising a connecting cylinder 1, a top cover 2 and a bottom cover 3, the connecting cylinder 1 and the top cover 2 being rotatably connected, an inner support hollow cylinder 4 being fixed between the top cover 2 and the bottom cover 3, a filter element 5 being sleeved on the outside of the inner support hollow cylinder 4, an air port 6 being provided at the center of the connecting cylinder 1, the top cover 2 and the bottom cover 3, a one-way valve 7 being installed in the air port 6 of the bottom cover 3, and an impeller 8 being fixed on the top of the one-way valve 7 at the air port 6 of the bottom cover 3.

[0025] In order to ensure the sealing performance during the rotation of the filter cartridge and prevent the leakage of dust-laden gas, in this embodiment, as a preferred technical solution of the present invention, the rotating connection between the top cover 2 and the connecting cylinder 1 adopts a mechanical dynamic sealing structure.

[0026] To ensure smooth airflow, reduce resistance loss, enable efficient airflow to drive the impeller 8 to rotate, and ensure the normal operation of the one-way valve 7, in this embodiment, as a preferred technical solution of the present invention, the air inlet 6 at the center of the connecting cylinder 1, the top cover 2, and the bottom cover 3, as well as the impeller 8 and the one-way valve 7 are arranged collinearly.

[0027] In order to increase the effective filtration area of ​​filter element 5 and improve the interception efficiency of fine particulate dust in the aluminum industry, in this embodiment, as a preferred technical solution of the present invention, filter element 5 is a cylindrical structure formed by folding and winding a continuous sheet, and the extension line of the center line of the folded cone angle does not intersect with the center line of the cylindrical structure, thereby increasing the effect of centrifugal force when the filter element rotates and reducing dust adhesion.

[0028] In order to achieve a stable connection between the filter element 5 and the top cover 2 and the bottom cover 3, and to ensure that the filter element 5 does not shift during the operation and rotation of the filter cartridge, in this embodiment, as a preferred technical solution of the present invention, the top cover 2 and the bottom cover 3 are provided with annular grooves 9 on the outer edge of the air port 6, and the upper and lower ends of the filter element 5 are respectively placed in the annular grooves 9 of the top cover 2 and the bottom cover 3.

[0029] In order to maintain the normal spacing of the pleats of the filter element 5, avoid the pleats from squeezing each other and reducing the effective filtration area, and ensure stable filtration performance, in this embodiment, as a preferred technical solution of the present invention, the inner walls of the annular grooves 9 of the top cover 2 and the bottom cover 3 are integrally connected with multiple separators 10. The multiple separators 10 are arranged circumferentially around the air port 6 along the inner wall of the annular groove 9. The separators 10 are placed in the pleats formed by the folding of the filter element 5 to ensure the normal spacing of the pleats of the filter element 5.

[0030] In this embodiment, the one-way valve 7 is a known technology that is widely used in daily life. Its working principle is that the fluid relies on pressure to push up the valve disc controlled by a spring. After the pressure is released, the spring force pushes the valve disc down, preventing backflow of liquid. It is commonly used in check valves with small diameters.

[0031] In this embodiment, the mechanical dynamic seal structure is a known technology that has been widely used in daily life. It refers to a device that prevents fluid leakage by having at least one pair of end faces kept in contact and sliding relative to each other under the action of the elastic force (or magnetic force) of the compensation mechanism perpendicular to the axis of rotation and the cooperation of the auxiliary seal.

[0032] In summary, with the help of the above-mentioned technical solution of this utility model, the filter cartridge is installed inside the cartridge dust collector and fixed to the corresponding interface of the dust collector through the connecting cylinder 1, ensuring stable operation of the filter cartridge inside the dust collector. When the cartridge dust collector is in operation, the negative pressure generated by the fan draws the dust-laden gas generated during the aluminum industry production process into the dust collector. The dust-laden gas is filtered as it flows through the filter cartridge, and the purified gas is discharged through the exhaust system, thus completing the purification treatment of the dust-laden gas.

[0033] Filter cartridge operation: During normal filtration, the fan of the filter cartridge dust collector generates negative pressure, drawing air into the filter cartridge through the air port 6 of the connecting cylinder 1. Dust-laden gas enters from the outside of the filter cartridge under this negative pressure, passing through the filter element 5. Since the filter element 5 is a cylindrical structure formed by folding and winding a continuous sheet of material, this special structure increases the filtration area, effectively trapping dust particles in the dust-laden gas. The dust is blocked on the outer surface of the filter element 5. The purified gas passes sequentially through the inner support hollow cylinder 4, the air port 6 of the top cover 2, and the air port 6 of the connecting cylinder 1, finally entering the clean air chamber of the dust collector and being discharged. At this time, the one-way valve 7 inside the air port 6 of the bottom cover 3 is closed, its valve disc tightly adhering to the valve seat under spring pressure, preventing dust-laden gas from flowing in from the air port 6 of the bottom cover 3, keeping the entire filter cartridge stationary.

[0034] As the filtration process proceeds, dust gradually accumulates on the outer surface of filter element 5. When the dust collector resistance reaches the set value, the control system starts the pulse cleaning program.

[0035] Filter cartridge working process: When pulse cleaning is required, the control system controls the pulse valve to operate, and compressed gas is rushed into the filter cartridge at high speed from the air port 6 of the connecting cylinder 1. The compressed gas exerts a strong reverse impact on the filter element 5, causing it to vibrate violently and dislodging the dust adhering to its outer surface. Simultaneously, the strong airflow exerts a pressure greater than the spring pressure on the valve disc of the one-way valve 7, opening the valve disc and allowing some airflow to escape from the air port 6 of the bottom cover 3. During the airflow's escape, it drives the impeller 8, which is fixed at the air port 6 of the bottom cover 3, to rotate. Since the impeller 8 is fixedly connected to the bottom cover 3, its rotation can drive the top cover 2, the inner support hollow cylinder 4, and the filter element 5 to rotate around the connecting cylinder 1 via the bottom cover 3. During the rotation of the filter cartridge, the centrifugal force generated by the rotation causes the dust dislodged by the pulse cleaning to move outward under the centrifugal force, reducing the amount that re-adheres to the surface of the filter element 5 or adjacent filter cartridges. After the cleaning is completed, the compressed gas stops flowing in, the valve disc of the one-way valve 7 resets and closes under the spring force, the filter cartridge stops rotating, and returns to normal filtration.

[0036] Structure and working principle of the mechanical seal: The rotating connection between the top cover 2 and the connecting cylinder 1 adopts a mechanical dynamic seal structure, which mainly consists of a rotating ring, a stationary ring, a spring, and auxiliary sealing components. The rotating ring is connected to the top cover 2 and rotates with it; the stationary ring is connected to the connecting cylinder 1 and remains stationary; the spring provides axial pressure to the rotating and stationary rings, ensuring a tight fit between their sealing end faces. During the rotation of the filter cylinder, the sealing end faces of the rotating and stationary rings slide relative to each other, forming a very thin liquid or gas film, which acts as a seal, preventing dust-laden gas from leaking from the rotating connection, ensuring stable air pressure inside the filter cylinder, and ensuring the normal operation of the filtration and dust removal processes.

[0037] Finally, it should be noted that, in this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A low-emission dust collector filter cartridge for the aluminum industry, comprising a connecting cylinder (1), a top cover (2), and a bottom cover (3), characterized in that: The connecting cylinder (1) and the top cover (2) are rotatably connected. An inner support hollow cylinder (4) is fixed between the top cover (2) and the bottom cover (3). A filter element (5) is sleeved on the outside of the inner support hollow cylinder (4). An air port (6) is opened at the center of the connecting cylinder (1), the top cover (2) and the bottom cover (3). A one-way valve (7) is installed in the air port (6) of the bottom cover (3). An impeller (8) is fixed on the top of the one-way valve (7) at the air port (6) of the bottom cover (3).

2. The ultra-low emission dust collector filter cartridge for the aluminum industry according to claim 1, characterized in that: The rotating connection between the top cover (2) and the connecting cylinder (1) adopts a mechanical dynamic sealing structure.

3. The ultra-low emission dust collector filter cartridge for the aluminum industry according to claim 1, characterized in that: The air inlet (6) at the center of the connecting cylinder (1), top cover (2) and bottom cover (3), as well as the impeller (8) and one-way valve (7) are arranged in a collinear manner.

4. The ultra-low emission dust collector filter cartridge for the aluminum industry according to claim 1, characterized in that: The filter element (5) is a cylindrical structure formed by folding and winding a continuous sheet.

5. The ultra-low emission dust collector filter cartridge for the aluminum industry according to claim 4, characterized in that: The top cover (2) and bottom cover (3) are provided with annular grooves (9) on the outer edge of the air inlet (6), and the upper and lower ends of the filter element (5) are respectively placed in the annular grooves (9) of the top cover (2) and bottom cover (3).

6. The ultra-low emission dust collector filter cartridge for the aluminum industry according to claim 5, characterized in that: The inner walls of the annular groove (9) of the top cover (2) and the bottom cover (3) are integrally connected with multiple partitions (10). The multiple partitions (10) are arranged in a circle around the air inlet (6) along the inner wall of the annular groove (9). The partitions (10) are placed in the folds formed by folding the filter element (5).

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