A multi-stage bag dust removal system for metal smelting flue gas treatment

Abstract

The present invention provides a multi-stage bag dust removal system for treating metal smelting flue gas, belonging to the field of gas dust removal technology. It includes a tank body with multiple filter chambers evenly arranged along its circumference, each filter chamber is provided with a dust filter assembly that divides the filter chamber into a lower chamber and an upper chamber, an air inlet channel is provided at the inner bottom of the tank body, and the air inlet channel is provided with multiple first air inlets connected to each lower chamber, an air outlet channel is provided in the tank body, and the air outlet channel is provided with multiple first air outlets connected to each upper chamber, the upper chamber of one of two adjacent filter chambers is connected to the lower chamber of the other by a connecting air duct, and a tank cover is detachably provided on the top of the tank body. By controlling the first electronic gate, the second electronic gate, and the third electronic gate, the equipment can achieve primary, secondary, or even tertiary filtration. When performing primary and secondary filtration operations, the dust filter assembly in the idle filter chamber can be inspected and repaired.

Description

Technical Field

[0001] The present invention relates to the technical field of gas dust removal, and in particular to a multi-stage bag dust removal system for treating metal smelting flue gas. Background Art

[0002] Metal smelting is an industrial process that extracts or refines metals through high-temperature treatment of metal ores or recycled metal raw materials. This process not only produces the target metal or alloy but also generates a variety of wastes that require proper disposal. Flue gas from the metal smelting process is one such waste that requires multiple purification steps before it meets standards and can be discharged. The flue gas produced by metal smelting contains a variety of harmful gases and dust particles. Purification of this flue gas requires first removing particulate impurities, followed by chemical treatment to remove harmful gases.

[0003] The bag dust collector is a gas filtering equipment widely used in industrial production. The patent with publication number CN116492781A discloses a bag dust collector, including a box body, an ash hopper, an air bag, an air inlet and an air outlet. The bottom of the box body is welded to the top of the ash hopper, the air bag is fixedly installed on the side of the box body, the air inlet is opened at the bottom of the side of the box body, and the air outlet is opened at the top of the other side of the box body. One end of a connecting pipe is welded on the right side of the air bag, and a plurality of injection pipes are welded on the lower end face of the connecting pipe. A flower plate is welded in the middle of the inner cavity of the box body, and a plurality of filter cartridges are clamped on the flower plate. One end of the injection pipe extends into the upper port of the filter cartridge. The flue gas passes through the filter cartridge from bottom to top in the box body and is discharged from the air outlet. The dust particles in the flue gas are intercepted and filtered by the filter cartridge, and then pulse airflow is intermittently blown out through the injection pipe to shake off the dust impurities on the surface of the filter cartridge.

[0004] However, in the actual production process of metal smelting flue gas, the pulse airflow cannot completely remove the impurities on the filter cartridge, and in the flue gas with a certain temperature, the impurities are easily adhered to each other, causing the filtration efficiency of the filter cartridge to gradually decrease. Summary of the Invention

[0005] In view of the above problems in the prior art, the present invention provides a multi-stage bag dust removal system for treating metal smelting flue gas.

[0006] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows:

[0007] Provided is a multi-stage bag dust removal system for metal smelting fume treatment, comprising a tank body, wherein a plurality of filter chambers are evenly arranged along the circumference of the tank body, each filter chamber is provided with a dust filter assembly, and the filter chamber is divided into a lower chamber and an upper chamber by the dust filter assembly, an air inlet channel is coaxially arranged at the inner bottom of the tank body, an air inlet pipe connected to the air inlet channel is connected to the tank body, a plurality of first air inlets connected one by one to each lower chamber are opened on the air inlet channel, a first electronic gate for opening and closing each first air inlet is provided on the air inlet channel, an air outlet channel is coaxially arranged in the tank body, and the tank body The top is connected to an outlet pipe connected to the air outlet channel, the air outlet channel is provided with a plurality of first air outlets connected one by one with each upper chamber, the air outlet channel is provided with a second electronic gate for opening and closing each first air outlet, adjacent filter chambers are connected by a connecting air duct, one end of the connecting air duct is connected with the lower chamber of the filter chamber on one side, and the other end is connected with the upper chamber of the filter chamber on the other side, and a third electronic gate for opening and closing the connecting air duct is provided at the end of the connecting air duct close to the upper chamber, and a tank cover is detachably provided on the top of the tank body, and the dust filter assembly can be inspected by removing the tank cover.

[0008] Furthermore, the dust filter assembly includes a connecting plate and a plurality of filter elements. A support plate is provided in the filter chamber. A plurality of through-holes are formed through the support plate. The filter element is detachably inserted into the support plate. The top end of the filter element abuts against the connecting plate. The connecting plate is detachably connected to the support plate.

[0009] It also includes a dust blowing assembly, which includes an air inlet pipe and a detachable air distribution coil arranged in the upper chamber of each filter chamber. One end of the air inlet pipe is connected to the air distribution coil, and the other end is connected to an external pulse air source. A plurality of blowing nozzles are connected to the air distribution coil, and the blowing nozzles correspond to the filter elements one by one and the air outlet end is vertically downward.

[0010] Furthermore, a hanging ear is fixedly provided on the connecting plate, and a connecting piece for connecting the filter element is provided on the connecting plate.

[0011] Furthermore, the connecting member includes a rotating handle and a buckle ring. The rotating handle is rotatably set on the connecting plate. The buckle ring includes a rotating handle rotatably set on the connecting plate and a movable ring vertically guided and slidably set on the connecting plate. The rotating handle is threadedly sleeved on the outer side of the movable ring. An elastic sheet is fixedly provided on the bottom wall of the movable ring. The elastic sheet extends outward away from one end of the movable ring. Multiple elastic sheets are evenly spaced along the circumference of the movable ring. A limiting portion is provided on the connecting plate for sliding upward with the movable ring to limit the inward contraction of the movable end of the elastic sheet. A circle of hanging grooves is coaxially provided on the filter element for the movable end of the elastic sheet to extend into.

[0012] Furthermore, a support frame is fixedly provided on the connecting plate, the support frame is located below the gas distribution coil, and a connecting hoop for connecting the gas distribution coil is provided on the support frame.

[0013] Furthermore, a dust exhaust assembly is provided at the bottom of the filter chamber, and the dust exhaust assembly includes a dust collecting hopper provided at the bottom of each filter chamber, the bottom of the dust collecting hopper is connected to a dust exhaust gate, and a dust receiving hopper is provided on the outside of the dust collecting hopper at the bottom of the tank body.

[0014] Furthermore, a heat-insulating chamber is provided in the tank body between two adjacent filter chambers, a connecting air duct is provided in the heat-insulating chamber, and both ends of the connecting air duct are sealedly connected to the heat-insulating chamber.

[0015] Furthermore, the top end of the air inlet channel is coaxially connected to the bottom end of the air outlet channel, and a cooling cylinder is coaxially sleeved on the outer side of the air inlet channel and the air outlet channel. The upper part of the cooling cylinder is connected to the insulation chamber, the bottom of the cooling cylinder is connected to the inlet pipe, and the bottom of the insulation chamber is connected to the outlet pipe. The inlet pipe and the outlet pipe are externally connected to the cooling system.

[0016] Furthermore, a dust sensor is provided in each upper chamber, and the dust sensor is electrically connected to the first electronic gate, the second electronic gate and the third electronic gate. The dust sensor is used to detect the dust concentration of the airflow in the upper chamber in real time.

[0017] Furthermore, an air flow sensor is provided in each connecting air duct, the dust sensor is electrically connected to the first electronic gate, the second electronic gate and the third electronic gate, and the air flow sensor is used to detect the gas flow passing between two adjacent filter chambers in real time.

[0018] The beneficial effects of the present invention are: a multi-stage bag dust removal system is composed of three filter chambers with an integrated structure. According to the requirements of the flue gas treatment process, one, two or even three filter chambers can be connected to the flue gas treatment system to achieve primary filtration treatment, secondary filtration treatment or even tertiary filtration treatment of the flue gas. When using the primary filtration treatment and secondary filtration treatment processes, the staff can inspect and repair the dust filter components in the idle filter chambers, thereby achieving the purpose of inspecting the filter components with reduced dust removal and filtration status in the bag dust removal system without shutting down the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the multi-stage bag dust removal system according to an embodiment of the present application;

[0020] Figure 2 This is a schematic diagram of the partial explosion structure of the multi-stage bag dust removal system according to an embodiment of the present application;

[0021] Figure 3 This is a partial cross-sectional structural diagram of a multi-stage bag dust removal system according to an embodiment of the present application;

[0022] Figure 4 This is a schematic diagram of the cross-sectional structure of the connection between the connecting plate and the filter element in the embodiment of the present application.

[0023] Among them, 1. tank body; 11. filter chamber; 12. lower chamber; 13. upper chamber; 14. connecting air duct; 15. tank cover 21. connecting plate; 22. filter element; 221. hanging groove; 23. support plate; 24. perforation; 25. turning handle; 261. movable ring; 262. elastic sheet; 27. connecting clamp; 3. air inlet channel; 31. air inlet pipe; 32. first air inlet; 4. air outlet channel; 41. air outlet pipe; 42. first air outlet; 51. air inlet pipe; 52. air distribution coil; 53. blowing nozzle; 61. dust collecting hopper; 62. dust collecting hopper; 71. heat insulation chamber; 72. cooling cylinder; 73. inlet pipe; 74. outlet pipe; 75. connecting hole. DETAILED DESCRIPTION

[0024] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0025] The embodiment of the present invention provides a multi-stage bag dust removal system for treating metal smelting flue gas, comprising Figure 1 、 Figure 2 and Figure 3 , comprising a tank body 1, in which a plurality of spacers are fixedly installed, and the tank body 1 is evenly divided into a plurality of filter chambers 11 along its own circumference by the plurality of spacers, and a dust filter assembly is provided in each filter chamber 11, and the dust filter assembly filters the passing flue gas by the principle of bag dust removal, and the filter chamber 11 is divided into a lower chamber 12 and an upper chamber 13 by the dust filter assembly, and in each filter chamber 11, the flue gas passes through the dust filter assembly from bottom to top. An air inlet channel 3 is coaxially provided at the inner bottom of the tank body 1, and an air inlet pipe 31 connected to the air inlet channel 3 is connected to the tank body 1, and a plurality of first air inlets 32 are provided on the air inlet channel 3, which are connected one by one to the lower chamber 12 of each filter chamber 11, and a first electronic gate for opening and closing the first air inlet 32 ​​is provided at each first air inlet 32 ​​on the air inlet channel 3.

[0026] An air outlet channel 4 is coaxially fixedly installed within the tank body 1. An air outlet pipe 41 connected to the top of the tank body 1 is connected to the air outlet channel 4. A plurality of first air outlets 42 are provided on the air outlet channel 4, each connected to each upper chamber 13. A second electronic gate for opening and closing the corresponding first air outlet 42 is provided at each first air outlet 42 on the air outlet channel 4. Adjacent filter chambers 11 are connected by a connecting air duct 14. One end of the connecting air duct 14 is connected to the lower chamber 12 of one filter chamber 11, and the other end is connected to the upper chamber 13 of the other filter chamber 11. The multiple filter chambers 11 are circulated and connected through the multiple connecting air ducts 14. A third electronic gate for opening and closing the connecting air duct 14 is provided at one end of each connecting air duct 14 near the upper chamber 13. A tank cover 15 is detachably mounted on the top of the tank body 1 . There are multiple tank covers 15 , and each of the multiple tank covers 15 corresponds to each filter chamber 11 . The dust filter assembly in the corresponding filter chamber 11 can be inspected and repaired by removing the tank cover 15 .

[0027] Specifically, the dust filter assembly includes a connecting plate 21 and multiple filter elements 22. A support ring is fixedly mounted on the inner wall of the filter chamber 11. A support plate 23 is detachably mounted on the support ring. The support plate 23 has multiple perforations 24 extending therethrough. The filter elements 22 are detachably inserted into the perforations 24 on the support plate 23. The connecting plate 21 is positioned above the support plate 23. The top of the filter element 22 abuts the connecting plate 21, and the connecting plate 21 and the support plate 23 are detachably connected. The side edges of the support plate 23 are integrally folded outward to form a lap, which is hooked onto the support ring. The side edges of the connecting plate 21 are integrally folded to form a flange. When the support plate 23 and the connecting plate 21 are engaged, through-holes are provided through the support ring, the lap, and the flange. Pins are inserted through the three to secure them together. After the tank lid 15 is opened, the filter elements 22 can be removed for inspection by removing the connecting plate 21.

[0028] A dust blowing assembly is also provided in the tank body 1, and the dust blowing assembly includes an air inlet pipe 51 and an air distribution coil 52 that can be removed from the upper chamber 13 of each filter chamber 11. One end of the air inlet pipe 51 is connected to the air distribution coil 52, and the other end is connected to an external pulse air source. A plurality of blowing nozzles 53 are connected to the air distribution coil 52. The blowing nozzles 53 correspond to the filter element 22 one by one, and the air outlet ends extend vertically downward into the filter element 22. A pulse valve is provided in each filter chamber 11. By opening the pulse valve, a pulse airflow can be blown into the filter element 22 by the blowing nozzle 53 to blow off the filtered dust on the surface of the filter element 22. When disassembling and assembling the filter element 22 in each filter chamber 11, the air distribution coil 52 needs to be removed before the filter element 22 can be disassembled.

[0029] In the embodiment of the present application, a dust discharge assembly is provided at the bottom of the filter chamber 11. The dust discharge assembly includes a dust hopper 61 disposed at the bottom of each filter chamber 11. A dust discharge gate is connected to the bottom of each dust hopper 61. Dust and impurities blown off from each filter chamber 11 fall into the dust hopper 61. The dust discharge gate is periodically opened to discharge impurities from the dust hopper 61. A dust collecting hopper 62 is also provided at the bottom of the tank body 1, outside the dust hopper 61. Impurities discharged from the dust hopper 61 are collected by the dust collecting hopper 62. A screw conveyor is provided at the bottom of the dust collecting hopper 62 to discharge the dust collected in the dust collecting hopper 62.

[0030] In the bag dust removal system proposed in the embodiment of the present application, the flue gas can be treated in one, two, or even multiple stages according to the requirements of the flue gas treatment process. Specifically, the number of filter chambers 11 in the tank body 1 is three, and the system can achieve one, two, and three stages of flue gas filtration treatment. When the system is performing one or two stages of treatment, the filter element 22 in the filter chamber 11 can be promptly inspected and repaired by utilizing the idle filter chamber 11, thereby improving the filtering effect of impurities in the flue gas. At the same time, the inspection and repair of the filter element 22 can be completed without shutting down the equipment.

[0031] In the embodiment of the present application, a lifting lug is fixedly mounted on the connecting plate 21 by welding, and a connector for connecting the filter element 22 is provided on the connecting plate 21. After the connecting plate 21 is placed on the support plate 23, the filter element 22 is connected using the connector. By hoisting the connecting plate 21 as a whole upward, the connecting plate 21 and the filter element 22 thereon can be lifted out of the tank body 1 as a whole, which can effectively improve the efficiency of filter maintenance.

[0032] Reference Figure 4The top of the movable ring 261 passes through the rotating handle 25 and the movable ring 261 is threadedly connected to the rotating handle 25, and an elastic piece 262 is fixedly installed on the bottom wall of the movable ring 261. The elastic piece 262 extends outward from one end of the movable ring 261 away from the center of the movable ring 261. A plurality of elastic pieces 262 are evenly spaced along the circumference of the movable ring 261. A circle of limiting parts is coaxially fixed on the connecting plate 21, and the elastic piece 262 remains in contact with the limiting part. As the movable ring 261 rises, the movable end of the elastic piece 262 is retracted to the inside of the movable ring 261. As the movable ring 261 falls, the elastic piece 262 extends outward under the action of elastic force. The filter element 22 is coaxially defined with a circle of mounting grooves 221 into which the movable ends of the elastic pieces 262 extend. When the connecting plate 21 is placed over the filter element 22, the movable ring 261 is lowered, causing the movable ends of the elastic pieces 262 to extend outward, engaging the movable ends of the elastic pieces 262 in the mounting grooves. This allows the filter element 22 to be lifted along with the connecting plate 21 when the connecting plate 21 is raised. To remove the filter element 22 from the connecting plate 21, the rotating handle 25 is rotated to lift the movable ring 261 upward, allowing the movable ends of the elastic pieces 262 to exit the mounting grooves, releasing the connection between the connecting plate 21 and the filter element 22 for easy removal.

[0033] Furthermore, multiple support brackets are fixed to the connecting plate 21. Connecting clamps 27 are fixed to the tops of the support brackets. These brackets are positioned between the air distribution coil 52 and the connecting plate. Connecting clamps 27 are used to connect and secure the air distribution coil 52. The support brackets support the air distribution coil 52, preventing the ends of the air distribution coil 52 from bending and deforming under the action of gravity. Furthermore, after removing the connection of the air distribution coil 52, the connecting plate 21 can be lifted to lift the air distribution coil 52 out of the filter chamber 11, thereby improving the efficiency of removing the dust filter assembly.

[0034] Furthermore, an insulating chamber 71 can be formed between two adjacent filter chambers 11 in the tank body 1 by two partitions, and the connecting air duct 14 is installed in the insulating chamber 71, which can effectively isolate the heat of the flue gas between the two filter chambers 11. When the dust filter component in one filter chamber 11 is inspected and repaired, the heat in the adjacent filter chamber 11 can be effectively isolated to avoid burns from the adjacent filter chamber 11 during the inspection and repair process.

[0035] In the embodiment of the present application, the top of the air inlet channel 3 is coaxially connected to the bottom of the air outlet channel 4. A cooling tube 72 is coaxially sleeved on the outside of the air inlet channel 3 and the air outlet channel 4. The upper portion of the cooling tube 72 is connected to the heat insulation chamber 71 through a connecting hole 75. The bottom of the cooling tube 72 is connected to an inlet pipe 73, and the bottom of the heat insulation chamber 71 is connected to an outlet pipe 74. The inlet pipe 73 and the outlet pipe 74 are connected to an external cooling system. A cooling medium is introduced from the inlet pipe 73 into the gap between the cooling tube 72 and the air inlet channel 3 and the air outlet channel 4 through the cooling system. The cooling medium fills the cooling tube 72 from the bottom to the top and then enters the heat insulation chamber 71 from the top of the cooling tube 72. The outlet pipe 74 can be provided with a valve. After the cooling medium partially fills the heat insulation chamber 71, it is discharged from the outlet pipe 74. The cooling medium is used to cool the flue gas passing through the air inlet channel 3, the air outlet channel 4, and the connecting air duct 14, thereby reducing the phenomenon of the flue gas causing the filter element 22 to stick. The cooling medium can be cooling water or cold air. In the embodiment of the present application, a set of cooling cylinders 72 can be used for cooling the flue gas of the multi-stage filter chamber 11 at the same time, saving equipment costs.

[0036] Furthermore, a dust sensor is provided in each upper chamber 13 and is electrically connected to the first, second, and third electronic gates. The dust sensor is used to detect in real time the dust concentration of the airflow passing through the upper chamber 13. When the bag dust removal system adopts a two-stage filtration process, the first electronic gate corresponding to the first filter chamber 11 where the flue gas enters is opened, and the other first electronic gates are closed. The third electronic gate of the air duct 14 connecting the first and second filter chambers 11 is opened, and the other third electronic gates are closed. The second electronic gate corresponding to the second filter chamber 11 is opened, and the other second electronic gates are closed.

[0037] When the dust sensor in the first filter chamber 11 detects that the dust concentration in the smoke after filtration in the current filter chamber 11 exceeds the standard threshold, the computer controls the first electronic gate of the current filter chamber 11 to close, the third electronic gate between the current filter chamber 11 and the lower filter chamber 11 to close, the second electronic gate of the lower filter chamber 11 to close, the first electronic gate of the lower filter chamber 11 to open, the third electronic gate between the lower filter chamber 11 and the third filter chamber 11 to open, and the second electronic gate of the third filter chamber 11 to open. In this way, the level rotation of each filter chamber 11 in the bag dust removal system is controlled by the real-time dust concentration of the smoke after filtration in the first filter chamber 11, avoiding the reduction of the dust removal and filtration effect of the bag dust removal system due to damage of the filter element 22 in the first filter chamber 11.

[0038] Furthermore, an air flow sensor is provided in each connecting air duct 14, and the dust sensor is electrically connected to the first electronic gate, the second electronic gate and the third electronic gate. The air flow sensor is used to detect in real time the gas flow passing between two adjacent filter chambers 11. Similarly, when the bag dust removal system adopts a two-stage filtration process, when the air flow sensor in the first filter chamber 11 detects that the gas flow of the current filter chamber 11 passing into the lower filter chamber 11 after filtration is lower than the standard threshold, the computer controls the first electronic gate of the current filter chamber 11 to close, the third electronic gate between the current filter chamber 11 and the lower filter chamber 11 to close, the second electronic gate of the lower filter chamber 11 to close, the first electronic gate of the lower filter chamber 11 to open, the third electronic gate between the lower filter chamber 11 and the third filter chamber 11 to open, and the second electronic gate of the third filter chamber 11 to open. This allows the real-time gas flow of the flue gas after filtration in the primary filter chamber 11 to control the level rotation of each filter chamber 11 in the bag dust removal system, thereby avoiding the reduction of the dust removal and filtration power of the bag dust removal system due to the sticking of the filter element 22 in the primary filter chamber 11.

[0039] The dust sensor and the air flow sensor are set together to monitor the working status of the bag dust collector in many aspects, rotate the levels of each filter chamber 11 in time, and idle the filter chamber 11 with reduced status. The staff will inspect and repair the filter chamber 11 with reduced status while the other filter chambers 11 are in normal working condition, and restore the operation of the bag dust removal system in time.

[0040] Those skilled in the art will appreciate that while preferred embodiments of the present invention have been described, further variations and modifications may be made to these embodiments once those skilled in the art are aware of the underlying inventive concepts. Therefore, the appended claims are intended to be interpreted as encompassing the preferred embodiments and all variations and modifications that fall within the scope of the present invention. Clearly, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, the present invention is intended to encompass such modifications and variations as fall within the scope of the claims and their equivalents.

Claims

1. A multi-stage bag dust removal system for metal smelting flue gas treatment, characterized by: The invention comprises a tank body (1), wherein a plurality of filter chambers (11) are evenly arranged along the circumference of the tank body (1), each filter chamber (11) is provided with a dust filter assembly, and the filter chamber (11) is divided into a lower chamber (12) and an upper chamber (13) by the dust filter assembly, an air inlet channel (3) is coaxially arranged at the inner bottom of the tank body (1), an air inlet pipe (31) connected to the air inlet channel (3) is connected to the tank body (1), a plurality of first air inlets (32) connected one by one with each lower chamber (12) are opened on the air inlet channel (3), a first electronic gate for opening and closing each first air inlet (32) is provided on the air inlet channel (3), an air outlet channel (4) is coaxially arranged in the tank body (1), and a first electronic gate for opening and closing each first air inlet (32) is provided on the top of the tank body (1). ) is connected to an air outlet pipe (41), a plurality of first air outlets (42) are provided on the air outlet channel (4) and are connected to each upper chamber (13) one by one, a second electronic gate for opening and closing each first air outlet (42) is provided on the air outlet channel (4), adjacent filter chambers (11) are connected via a connecting air duct (14), one end of the connecting air duct (14) is connected to the lower chamber (12) of the filter chamber (11) on one side, and the other end is connected to the upper chamber (13) of the filter chamber (11) on the other side, a third electronic gate for opening and closing the connecting air duct (14) is provided at one end of the connecting air duct (14) close to the upper chamber (13), and a tank cover (15) is detachably provided on the top of the tank body (1), and the dust filter assembly can be inspected and repaired by removing the tank cover (15).

2. The multi-stage bag dust removal system for metal smelting flue gas treatment according to claim 1 is characterized in that: The dust filter assembly comprises a connecting plate (21) and a plurality of filter elements (22); a support plate (23) is provided in the filter chamber (11); a plurality of through holes (24) are provided through the support plate (23); the filter element (22) is detachably provided in the support plate (23); the top end of the filter element (22) abuts against the connecting plate (21); and the connecting plate (21) and the support plate (23) are detachably connected; The invention also includes a dust blowing assembly, which includes an air inlet pipe (51) and a detachable air distribution coil (52) arranged in the upper chamber (13) of each filter chamber (11), one end of the air inlet pipe (51) is connected to the air distribution coil (52), and the other end is connected to an external pulse air source, and a plurality of blowing nozzles (53) are connected to the air distribution coil (52), and the blowing nozzles (53) correspond to the filter elements (22) one by one, and the air outlet ends are vertically downward.

3. The multi-stage bag dust removal system for treating metal smelting flue gas according to claim 2 is characterized in that: A hanging lug is fixedly provided on the connecting plate (21), and a connecting piece for connecting the filter element (22) is provided on the connecting plate (21).

4. The multi-stage bag dust removal system for metal smelting fume treatment according to claim 3 is characterized in that: The connecting member comprises a rotating handle (25) and a buckling ring, wherein the rotating handle (25) is rotatably arranged on the connecting plate (21), and the buckling ring comprises a rotating handle (25) rotatably arranged on the connecting plate (21) and a movable ring (261) vertically guided and slidably arranged on the connecting plate (21), wherein the rotating handle (25) is threadedly sleeved on the outer side of the movable ring (261), and an elastic sheet (262) is fixedly arranged on the bottom wall of the movable ring (261), wherein the elastic sheet (262) extends outwardly away from one end of the movable ring (261), and a plurality of elastic sheets (262) are evenly spaced along the circumference of the movable ring (261), and a limiting portion is provided on the connecting plate (21) for sliding upward with the movable ring (261) to limit the movable end of the elastic sheet (262) from shrinking inwardly, and a circle of hanging grooves (221) for the movable end of the elastic sheet (262) to extend into are coaxially provided on the filter element (22).

5. The multi-stage bag dust removal system for metal smelting fume treatment according to claim 3 is characterized in that: A support frame is fixedly provided on the connecting plate (21), the support frame is located below the gas distribution coil (52), and a connecting hoop (27) for connecting the gas distribution coil (52) is provided on the support frame.

6. The multi-stage bag dust removal system for treating metal smelting flue gas according to claim 1 is characterized in that: A dust discharge assembly is provided at the bottom of the filter chamber (11), and the dust discharge assembly includes a dust collecting hopper (61) provided at the bottom of each filter chamber (11), the bottom of the dust collecting hopper (61) is connected to a dust discharge gate, and a dust receiving hopper (62) is provided at the bottom of the tank body (1) outside the dust collecting hopper (61).

7. The multi-stage bag dust removal system for treating metal smelting flue gas according to claim 1 is characterized in that: A heat-insulating chamber (71) is provided between two adjacent filter chambers (11) in the tank body (1), the connecting air duct (14) is provided in the heat-insulating chamber (71), and both ends of the connecting air duct (14) are sealedly connected to the heat-insulating chamber (71).

8. The multi-stage bag dust removal system for treating metal smelting flue gas according to claim 7, characterized in that: The top end of the air inlet channel (3) is coaxially connected to the bottom end of the air outlet channel (4); a cooling tube (72) is coaxially sleeved on the outer sides of the air inlet channel (3) and the air outlet channel (4); the upper part of the cooling tube (72) is connected to the heat insulation chamber (71); the bottom of the cooling tube (72) is connected to an inlet pipe (73); the bottom of the heat insulation chamber (71) is connected to an outlet pipe (74); the inlet pipe (73) and the outlet pipe (74) are externally connected to a cooling system.

9. A multi-stage bag dust removal system for treating metal smelting flue gas according to any one of claims 1 to 8, characterized in that: A dust sensor is provided in each upper chamber (13), the dust sensor being electrically connected to the first electronic gate, the second electronic gate and the third electronic gate, and the dust sensor being used to detect in real time the dust concentration of the airflow passing through the upper chamber (13).

10. The multi-stage bag dust removal system for treating metal smelting flue gas according to claim 9, characterized in that: An air flow sensor is provided in each of the connecting air ducts (14). The dust sensor is electrically connected to the first electronic gate, the second electronic gate and the third electronic gate. The air flow sensor is used to detect the gas flow passing between two adjacent filter chambers (11) in real time.

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