A silver powder collection and filtration device and method in a spray pyrolysis method for producing silver powder

Abstract

This invention belongs to the field of environmental filtration technology, and specifically relates to a silver powder collection and filtration device and method in the production of silver powder using a spray pyrolysis method. It includes a pulse-jet bag filter body, which is equipped with an inlet pipe, a suction unit, and a bag filter unit. The bag filter unit includes: a mounting plate fixed inside the pulse-jet bag filter body, on which several detachable filter bags are inserted; several sealing covers corresponding to the filter bags, which are detachably mounted on the top of the mounting plate; and a reversing pipe fixedly inserted through the side wall of the sealing covers. This invention can efficiently filter and collect silver powder, preventing silver powder leakage to ensure sufficient collection and preventing environmental pollution. It can also automatically alert and locate damaged filter bags for convenient subsequent maintenance, while reducing the frequency of pulse backflushing and adapting to existing equipment for cost reduction.

Description

Technical Field

[0001] This invention belongs to the field of environmental filtration technology, and in particular relates to a silver powder collection and filtration device and method in the production of silver powder by spray pyrolysis. Background Technology

[0002] The spray pyrolysis method prepares ultrafine silver powder by atomizing silver salt precursors and pyrolyzing them at high temperatures. The silver powder has the characteristics of easy agglomeration, high activity, and conductivity. Pulse bag filter dust collectors are often combined with cyclone separators to form a two-stage collection system, which is suitable for high-temperature working conditions, efficiently captures fine powder, and the collection system can prevent ultrafine silver powder from escaping and polluting the environment.

[0003] When exhaust gas containing silver powder enters the dust collector, it passes through the outside of the filter bag, where the silver powder is intercepted. The purified gas is discharged through the inside of the filter bag. However, the silver powder produced in the spray pyrolysis method has an ultra-fine particle size, strong agglomeration, high surface activity, and conductivity. It is easy to adsorb and agglomerate to form a stubborn filter cake. Moreover, it is easy to oxidize and corrode the filter material at high temperatures. This can lead to pore blockage, fiber breakage, or damage to the filter bag, resulting in the escape of silver powder. This not only affects the silver powder collection efficiency and yield but also pollutes the environment. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a silver powder collection and filtration device and method for producing silver powder using a spray pyrolysis method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a silver powder collection and filtration device for silver powder production by spray pyrolysis, comprising a pulse bag filter body, wherein the pulse bag filter body is provided with a dust inlet pipe, a suction unit and a bag filter unit, wherein the bag filter unit comprises: The mounting plate is fixed inside the pulse bag dust collector body, and several detachable filter bags are inserted into the mounting plate. Several sealing covers are arranged one-to-one above the filter bag, and the sealing covers are detachably installed on the top of the mounting plate; A reversing pipe is fixedly inserted through the side wall of the sealing cover. An air inlet pipe connected to the filter bag is fixedly inserted at the bottom of the reversing pipe. A main solenoid valve and an auxiliary solenoid valve are respectively installed inside the reversing pipe on both sides of the air inlet pipe. A redundant filter unit is located on one side of the secondary solenoid valve and is connected to the interior of the reversing pipe; The switching detection unit is located between the suction unit and the air outlet of the pulse bag filter body.

[0006] Preferably, the redundant filtration unit includes a sealing frame fixed to the outer wall of the sealing cover, and the sealing frame is located on the side of the secondary solenoid valve away from the main solenoid valve. The sealing frame is connected to the reversing pipe. A movable frame plate is provided on the side of the sealing frame away from the reversing pipe, and a filter cloth block is fixed inside the movable frame plate. The movable frame plate is equipped with a telescopic support assembly, and the movable frame plate is connected to the sealing frame through the telescopic support assembly.

[0007] Preferably, the telescopic support assembly includes several support blocks fixed to the outer wall of the sealing frame, several sliding rods are fixed to the side wall of the movable frame plate, and the sliding rods are slidably connected to the side wall of the support blocks. A support spring is fixed between the handle of the sliding rod and the support block.

[0008] Preferably, an insulating sleeve coaxial with one of the slide rods is fixed to the outer wall of the sealing cover. An insulating rod is slidably connected inside the insulating sleeve and fixedly connected to the slide rod on the same side. A resistance column is fixed to the end of the insulating rod. A conductive ring that slides in contact with the resistance column is fixed inside the insulating sleeve, and the connection circuit between the conductive ring and the resistance column is electrically connected to the control terminal of the pulse bag dust collector.

[0009] Preferably, a flexible sealing sleeve is fixed to the side wall of the movable frame plate, and the end of the flexible sealing sleeve away from the movable frame plate is fixedly connected to the inner side wall of the sealing frame.

[0010] Preferably, the switching detection unit includes a detection box, which is fixed between the air outlet of the pulse bag dust collector and the air inlet of the suction unit. A laser dust monitor is fixed on the top of the detection box, and the detection end of the laser dust monitor is located inside the detection box. The control end of the pulse bag dust collector controls the main solenoid valve and the auxiliary solenoid valve to work according to the electrical signal fed back by the laser dust monitor.

[0011] Preferably, the intake pipe is a tapered pipe, and the inner diameter of the intake end of the intake pipe is smaller than the inner diameter of the outlet end. The intake pipe has a movable hollow float inside, and an installation plate is fixedly sleeved on the outer wall of the intake pipe. The side wall of the installation plate has several grooves, and a return bar is hinged inside the groove. An upper connecting post is fixed to the bottom of the hollow float, and a lower connecting post is fixed to the lower end of the side wall of the return bar. The lower connecting post is connected to the upper connecting post through a connecting rope.

[0012] A method for collecting and filtering silver powder in the production of silver powder by spray pyrolysis, which uses the silver powder collection and filtration device for the production of silver powder by spray pyrolysis as described above, includes the following steps: Step 1: The silver powder produced by the spray pyrolysis method is introduced into the filter chamber of the pulse bag dust collector through the dust inlet pipe; Step 2: The silver powder is filtered and collected through the filter bags of the bag filter unit; Step 3: Monitor the dust concentration of the filtered airflow online by switching the detection unit. When the switching detection unit detects that the dust concentration exceeds the standard, it sends an electrical signal back to the pulse bag filter body. Step 4: The control terminal of the pulse bag filter controls the main and auxiliary solenoid valves to operate. At this time, the airflow is filtered through the redundant filter unit. Step 5: After the silver powder production stops, the staff shuts down the pulse bag filter and, according to the filter bag number displayed on the control terminal of the pulse bag filter, disassembles and replaces the corresponding filter bag, while discharging the silver powder filtered by the redundant filter unit.

[0013] Compared with existing technologies, the advantages of a silver powder collection and filtration device and method in the production of silver powder by spray pyrolysis are as follows: By coordinating the pulse dust collector, dust inlet pipe, suction unit, and bag filter unit, the produced silver powder can be filtered and collected. The bag filter unit, with its internal sealing cover, reversing pipe, air inlet pipe, main solenoid valve, auxiliary solenoid valve, redundant filtration unit, and switching detection unit, can minimize the leakage of silver powder due to filter bag damage, based on the dust concentration in the filtered airflow and the redundant filtration design. This ensures sufficient silver powder collection and prevents silver powder from polluting the environment.

[0014] By coordinating the insulating sleeve, insulating rod, resistance column, and conductive ring, the system can automatically alert personnel to locate the damaged filter bag when phenomena such as filter bag breakage occur, based on the amount of dust in the airflow, thus facilitating subsequent maintenance.

[0015] By utilizing the buoyancy of the airflow and cooperating with the hollow float, mounting plate, backlash bar, upper connecting column, lower connecting column, and connecting rope, the device can beat the filter bag during the silver powder filtration and collection process, causing the silver powder adhering to and accumulating on the outside of the filter bag to fall off. This effectively reduces the frequency of pulse backflushing. At the same time, the entire device can be directly modified on existing pulse bag dust collectors, reducing cost investment. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a silver powder collection and filtration device in the production of silver powder by spray pyrolysis provided by the present invention; Figure 2 This is a three-dimensional structural schematic diagram of the filter bag of a silver powder collection and filtration device in the production of silver powder by spray pyrolysis provided by the present invention; Figure 3 This is a schematic diagram showing the position of the filter cloth block in a silver powder collection and filtration device for producing silver powder using a spray pyrolysis method, as provided by the present invention. Figure 4 This is a three-dimensional structural diagram of the reversing pipe of a silver powder collection and filtration device in the production of silver powder by spray pyrolysis provided by the present invention. Figure 5 This is a bottom view of the reversing pipe of a silver powder collection and filtration device in the spray pyrolysis method for producing silver powder provided by the present invention. Figure 6 This is a three-dimensional structural schematic diagram of the insulating sleeve of a silver powder collection and filtration device in the production of silver powder by spray pyrolysis provided by the present invention. Figure 7 This is a schematic diagram of the connection structure between the resistance column and the insulating sleeve of a silver powder collection and filtration device in the production of silver powder by spray pyrolysis provided by the present invention.

[0017] In the diagram: 1. Pulse bag filter body; 2. Dust inlet pipe; 3. Suction unit; 4. Bag filter unit; 5. Mounting plate; 6. Filter bag; 7. Sealing cover; 8. Reversing pipe; 9. Air inlet pipe; 10. Main solenoid valve; 11. Auxiliary solenoid valve; 12. Redundant filter unit; 121. Sealing frame; 122. Movable frame plate; 123. Filter cloth block; 13. Switching detection unit; 131. Detection box; 132. Laser dust monitor; 14. Telescopic support assembly; 141. Support block; 142. Slide rod; 143. Support spring; 15. Insulating sleeve; 16. Insulating rod; 17. Resistance column; 18. Conductive ring; 19. Flexible sealing sleeve; 20. Hollow float; 21. Mounting plate; 22. Return bar; 23. Upper connecting column; 24. Lower connecting column; 25. Connecting rope. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] like Figures 1-7As shown, a silver powder collection and filtration device for silver powder production by spray pyrolysis includes a pulse bag filter body 1. The pulse bag filter body 1 is provided with a dust inlet pipe 2, a suction unit 3, and a bag filter unit 4. The bag filter unit 4 includes: a mounting plate 5, which is fixed inside the pulse bag filter body 1. Several detachable filter bags 6 are inserted into the mounting plate 5. Several sealing covers 7 are correspondingly arranged above the filter bags 6. The sealing covers 7 are detachably installed on the top of the mounting plate 5. A reversing pipe 8 is fixedly inserted through the side wall of the sealing cover 7. An air inlet pipe 9 communicating with the filter bags 6 is fixedly inserted into the bottom of the reversing pipe 8. A main solenoid valve 10 and a secondary solenoid valve 11 are respectively installed inside the reversing pipe 8 on both sides of the air inlet pipe 9. A redundant filter unit 12 is arranged on one side of the secondary solenoid valve 11 and communicates with the inside of the reversing pipe 8. The redundant filter unit 12 includes: The sealing frame 121 is fixed to the outer wall of the sealing cover 7 and is located on the side of the auxiliary solenoid valve 11 away from the main solenoid valve 10. The sealing frame 121 is connected to the reversing pipe 8. A movable frame plate 122 is provided on the side of the sealing frame 121 away from the reversing pipe 8. A filter cloth block 123 is fixed inside the movable frame plate 122. A telescopic support assembly 14 is installed on the movable frame plate 122 and the movable frame plate 122 is connected to the sealing frame 121 through the telescopic support assembly 14. The telescopic support assembly 14 includes several support blocks 141 fixed to the outer wall of the sealing frame 121. Several sliding rods 142 are fixed to the side wall of the movable frame plate 122 and are slidably connected to the side wall of the support blocks 141. A support spring 143 is fixed between the handle of the sliding rod 142 and the support block 141, which can facilitate the movable frame plate 122 to return to its original position after the airflow disappears.

[0020] An insulating sleeve 15, coaxial with one of the slide rods 142, is fixed to the outer wall of the sealing cover 7. An insulating rod 16 is slidably connected inside the insulating sleeve 15, and the insulating rod 16 is fixedly connected to the slide rod 142 on the same side. A resistance column 17 is fixed to the end of the insulating rod 16. A conductive ring 18, which is in slidable contact with the resistance column 17, is fixed inside the insulating sleeve 15. The connection circuit between the conductive ring 18 and the resistance column 17 is electrically connected to the control terminal of the pulse bag dust collector body 1. When the contact point between the resistance column 17 and the conductive ring 18 changes, the resistance of the connection circuit between the resistance column 17 and the conductive ring 18 changes synchronously.

[0021] A flexible sealing sleeve 19 is fixed to the side wall of the movable frame plate 122, and the end of the flexible sealing sleeve 19 away from the movable frame plate 122 is fixedly connected to the inner side wall of the sealing frame 121. The flexible sealing sleeve 19 can ensure the sealing between the movable frame plate 122 and the sealing frame 121, and will not affect the normal movement of the movable frame plate 122.

[0022] The switching detection unit 13 is located between the suction unit 3 and the outlet of the pulse bag dust collector 1. The switching detection unit 13 includes a detection box 131, which is fixed between the outlet of the pulse bag dust collector 1 and the inlet of the suction unit 3. A laser dust monitor 132 is fixed on the top of the detection box 131, and the detection end of the laser dust monitor 132 is located inside the detection box 131. The control end of the pulse bag dust collector 1 controls the main solenoid valve 10 and the auxiliary solenoid valve 11 to work according to the electrical signal fed back by the laser dust monitor 132. The laser dust monitor 132 can determine the dust concentration by emitting laser and calculating the intensity of the laser light that is received and scattered back.

[0023] The intake pipe 9 is a tapered pipe, and the inner diameter of the intake end of the intake pipe 9 is smaller than the inner diameter of the outlet end. The intake pipe 9 is equipped with a movable hollow float 20. The outer wall of the intake pipe 9 is fixedly fitted with an installation plate 21, and the side wall of the installation plate 21 is provided with several grooves. The inside of the grooves is hinged with a rebound bar 22. The bottom of the hollow float 20 is fixed with an upper connecting post 23, and the lower end of the side wall of the rebound bar 22 is fixed with a lower connecting post 24. The lower connecting post 24 is connected to the upper connecting post 23 through a connecting rope 25, which can facilitate periodic rebound and knocking of the filter bag 6, and facilitate the shaking off of silver powder adhering to the surface of the filter bag 6.

[0024] The operating principle of this invention is explained as follows: The suction unit 3 generates a negative pressure suction force within the filter chamber of the pulse bag dust collector 1, and the silver powder produced by the spray pyrolysis method is introduced into the filter chamber of the pulse bag dust collector 1 through the dust inlet pipe 2. The airflow containing silver powder entering the filter chamber enters the filter bag 6 under the action of the negative pressure suction force. At this time, the filter bag 6 filters and traps the silver powder in the airflow. The filtered airflow enters the reversing pipe 8 through the filter bag 6 and the air inlet pipe 9, and is discharged through one side of the main solenoid valve 10. Then, the airflow passes through the detection box 131 and is sucked out by the suction unit 3. The suction unit 3 includes components such as a negative pressure fan, a drive motor, a sealed pipe, and a shock-absorbing base. When the airflow passes through the inside of the detection box 131, the laser dust monitor 132 emits a laser to irradiate the particles in the airflow. The built-in sensor receives the scattered light signal and converts it into an electrical signal. The data processing module calculates the real-time dust concentration, which can be monitored online. When the dust concentration exceeds the threshold, it indicates that there may be phenomena such as filter bag 6 being damaged or pores being enlarged. At this time, the laser dust monitor 132 will send an electrical signal back to the control terminal of the pulse bag dust collector 1. After receiving the electrical signal from the laser dust monitor 132, the control terminal of the pulse bag dust collector 1 immediately controls each main solenoid valve 10 to close and each auxiliary solenoid valve 11 to open. At this time, the airflow through the filter bag 6 enters the sealing frame 121 through the inlet pipe 9 and the reversing pipe 8, and is discharged through the filter cloth block 123 inside the movable frame plate 122. The filter cloth block 123 can intercept and filter silver powder and other substances that may be contained in the airflow. Thus, by using redundant filtration structure, when the filter bag 6 may be damaged or the pores may be enlarged, the dust in the airflow can be intercepted and filtered in a secondary manner, minimizing the possibility of silver powder escaping. Secondly, when the airflow containing silver powder passes through the filter cloth 123, the airflow resistance is high due to the blocking effect of the silver powder-containing airflow on the pores of the filter cloth 123. At this time, the airflow thrust on the filter cloth 123 decreases synchronously, resulting in a smaller displacement of the movable frame plate 122 away from the sealing frame 121. However, for the undamaged filter bag 6 with no enlarged pores, the airflow passes through the filter cloth normally. At this time, the filter cloth 123 is subjected to the thrust of the airflow, causing the displacement of the movable frame plate 122 to increase. After receiving the electrical signal from the laser dust monitor 132, the pulse bag dust collector 1 connects the connection circuit between each resistor column 17 and the conductive ring 18. Since the displacement of the filter cloth 123 through which the silver powder-containing airflow passes is similar to that of the pure air... The different displacements of the filter cloth blocks 123 as they flow through result in different contact points between the resistor column 17 and the conductive ring 18. Consequently, the length of the resistor column 17 connected to the conductive ring 18 varies (the length of the resistor column 17 connected to the conductive ring 18 at the filter cloth block 123 where the silver powder-containing airflow passes is shorter, resulting in a lower resistance in the circuit connecting the resistor column 17 and the conductive ring 18). Based on the differences in the electrical signals of the circuit connecting each resistor column 17 and the conductive ring 18, the pulse bag dust collector 1 can determine the location of the filter bag 6 that may be damaged or have enlarged pores. Each filter bag 6 has a corresponding number, and the control terminal of the pulse bag dust collector 1 will display the corresponding number. Subsequently, the staff can quickly locate the filter bag 6 with defects such as damage or enlarged pores based on the number information, facilitating maintenance. During the normal silver powder filtration and collection process, due to the negative pressure suction of the suction unit 3, the airflow needs to enter the reversing pipe 8 through the air inlet pipe 9. Under the action of airflow, the hollow float 20 will move upward. At this time, the hollow float 20 will drive the lower ends of each impact bar 22 to deflect inward through the upper connecting column 23, connecting rope 25 and lower connecting column 24. Meanwhile, the control end of the pulse bag dust collector 1 will periodically control the main solenoid valve 10 to close and keep the auxiliary solenoid valve 11 closed. At this time, due to the disappearance of the flowing airflow, under the action of gravity, the hollow float 20 moves downward, and each impact bar 22 will quickly rotate and hit the inner wall of the filter bag 6. Under the impact vibration of the rotating impact bar 22, The silver powder adhering to the surface of the filter bag 6 will detach from the surface of the filter bag 6. Therefore, by periodically controlling the closing of the main solenoid valve 10, the filter bag 6 can be vibrated and detached by the impact bar 22 rotating and striking it. On the one hand, this can minimize the possibility of the silver powder being deeply embedded in the pores of the filter bag 6, and on the other hand, it can minimize the long-term adhesion of silver powder that may clog the filter bag 6 and affect the ventilation efficiency. (The periodic closing frequency of the main solenoid valve 10 can be preset according to production parameters such as the silver powder output through the control terminal of the pulse bag dust collector 1). The time points for the periodic closing of the main solenoid valve 10 corresponding to each filter bag 6 can be staggered to avoid the simultaneous closing of the main solenoid valve 10 and its impact on normal ventilation and filtration.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A silver powder collection and filtration device for silver powder production by spray pyrolysis, comprising a pulse bag filter body (1), wherein the pulse bag filter body (1) is provided with a dust inlet pipe (2), a suction unit (3), and a bag filter unit (4), characterized in that, The bag filter unit (4) includes: Mounting plate (5) is fixed inside the pulse bag dust collector body (1), and several detachable filter bags (6) are inserted into the mounting plate (5). Several sealing covers (7) are arranged one-to-one above the filter bag (6), and the sealing covers (7) are detachably installed on the top of the mounting plate (5); A reversing pipe (8) is fixedly inserted through the side wall of the sealing cover (7). An air inlet pipe (9) connected to the filter bag (6) is fixedly inserted at the bottom of the reversing pipe (8). A main solenoid valve (10) and a secondary solenoid valve (11) are respectively installed inside the reversing pipe (8) at the positions on both sides of the air inlet pipe (9). A redundant filter unit (12) is disposed on one side of the secondary solenoid valve (11) and is connected to the interior of the reversing pipe (8); The switching detection unit (13) is set between the suction unit (3) and the outlet end of the pulse bag dust collector body (1).

2. The silver powder collection and filtration device for silver powder production by spray pyrolysis according to claim 1, characterized in that, The redundant filter unit (12) includes a sealing frame (121) fixed on the outer wall of the sealing cover (7), and the sealing frame (121) is located on the side of the auxiliary solenoid valve (11) away from the main solenoid valve (10). The sealing frame (121) is connected to the reversing pipe (8). The side of the sealing frame (121) away from the reversing pipe (8) is provided with a movable frame plate (122), and a filter cloth block (123) is fixed inside the movable frame plate (122). The movable frame plate (122) is equipped with a telescopic support assembly (14), and the movable frame plate (122) is connected to the sealing frame (121) through the telescopic support assembly (14).

3. The silver powder collection and filtration device for silver powder production by spray pyrolysis according to claim 2, characterized in that, The telescopic support assembly (14) includes several support blocks (141) fixed to the outer wall of the sealing frame (121). Several sliding rods (142) are fixed to the side wall of the movable frame plate (122), and the sliding rods (142) are slidably connected to the side wall of the support block (141). A support spring (143) is fixed between the handle of the sliding rod (142) and the support block (141).

4. The silver powder collection and filtration device for silver powder production by spray pyrolysis according to claim 3, characterized in that, An insulating sleeve (15) coaxial with one of the slide rods (142) is fixed on the outer wall of the sealing cover (7). An insulating rod (16) is slidably connected inside the insulating sleeve (15), and the insulating rod (16) is fixedly connected to the slide rod (142) on the same side. A resistor column (17) is fixed at the end of the insulating rod (16). A conductive ring (18) that slides in contact with the resistor column (17) is fixed inside the insulating sleeve (15), and the connection circuit between the conductive ring (18) and the resistor column (17) is electrically connected to the control terminal of the pulse bag dust collector body (1).

5. The silver powder collection and filtration device for silver powder production by spray pyrolysis according to claim 2, characterized in that, The side wall of the movable frame plate (122) is fixed with a flexible sealing sleeve (19), and the end of the flexible sealing sleeve (19) away from the movable frame plate (122) is fixedly connected to the inner side wall of the sealing frame (121).

6. The silver powder collection and filtration device for silver powder production by spray pyrolysis according to claim 1, characterized in that, The switching detection unit (13) includes a detection box (131), which is fixed between the air outlet of the pulse bag dust collector (1) and the air inlet of the suction unit (3). A laser dust monitor (132) is fixed on the top of the detection box (131), and the detection end of the laser dust monitor (132) is located inside the detection box (131). The control end of the pulse bag dust collector (1) controls the main solenoid valve (10) and the auxiliary solenoid valve (11) to work according to the electrical signal fed back by the laser dust monitor (132).

7. The silver powder collection and filtration device for silver powder production by spray pyrolysis according to claim 1, characterized in that, The air intake pipe (9) is a tapered pipe, and the inner diameter of the air intake end of the air intake pipe (9) is smaller than the inner diameter of the air outlet end. The air intake pipe (9) is provided with a movable hollow float (20). The outer wall of the air intake pipe (9) is fixedly sleeved with an installation plate (21), and the side wall of the installation plate (21) is provided with several grooves. The grooves are hinged with a return bar (22). The bottom of the hollow float (20) is fixed with an upper connecting column (23), and the lower end of the side wall of the return bar (22) is fixed with a lower connecting column (24). The lower connecting column (24) is connected to the upper connecting column (23) through a connecting rope (25).

8. A method for collecting and filtering silver powder in the production of silver powder by spray pyrolysis, comprising the silver powder collection and filtration device for the production of silver powder by spray pyrolysis as described in claim 1, characterized in that, The method includes the following steps: Step 1: The silver powder produced by spray pyrolysis is introduced into the filter chamber of the pulse bag dust collector (1) through the dust inlet pipe (2); Step 2: The silver powder is filtered and collected through the filter bag (6) of the bag dust collection unit (4); Step 3: The dust concentration of the filtered airflow is monitored online by switching detection unit (13). When the dust concentration exceeds the standard, the switching detection unit (13) sends an electrical signal back to the pulse bag dust collector body (1). Step 4: The control terminal of the pulse bag dust collector (1) controls the main solenoid valve (10) and the auxiliary solenoid valve (11) to work. At this time, the airflow is filtered through the redundant filter unit (12). Step 5: After the silver powder production stops, the staff shuts down the pulse bag dust collector (1) and, according to the filter bag (6) number displayed on the control terminal of the pulse bag dust collector (1), disassembles and replaces the corresponding filter bag (6), and discharges the silver powder filtered by the redundant filter unit (12).

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