An automatic dust cleaning system device for a bag-type dust collector of a chlorine gas system of a multi-polarity magnesium electrolytic cell

Abstract

The utility model relates to electrolytic bath equipment technical field, concretely for a kind of for multi-polarity magnesium electrolytic cell chlorine system cloth bag dust collector automatic dust cleaning system device, including shell, the inside upper portion of shell is equipped with spout pipe, the lower end of spout pipe is connected with cloth bag, the side of shell is connected to electrolytic cell by chlorine gas access pipeline, main valve is installed on chlorine gas access pipeline, the pipeline of shell connection electrolytic cell is also connected to standby dust cleaning system by branch pipeline, switch valve is installed on branch pipeline;The inside lower end of shell is provided with conical dust collecting bin, dust collecting bin bottom is connected with dust material collection box by pipeline, and dust valve is installed on pipeline.In the device for multi-polarity magnesium electrolytic cell chlorine system cloth bag dust collector automatic dust cleaning system, realize full-automatic dust cleaning process by the feedback signal of DCS control unit in combination with differential pressure transmitter and dust bin liquid level meter.

Description

Technical Field

[0001] This utility model relates to the field of electrolytic cell equipment technology, specifically to an automatic dust removal system device for a bag filter dust collector in a chlorine system of a multipolar magnesium electrolytic cell. Background Technology

[0002] In the chlorine treatment process of multipolar magnesium electrolysis cells, bag filters play a crucial role. Their stable operation and efficient dust removal are of great significance for ensuring smooth production processes, reducing equipment wear and tear, and improving product quality.

[0003] Existing technologies (such as the invention with application number 201910324835.5) focus on solving the problem of uneven air intake in baghouse dust collectors. By installing partitions within the housing and using specific inlet pipes, diversion pipes, and connecting pipe structures, dust-laden air can enter each chamber more evenly, thus optimizing the airflow to each bag. However, this technical solution primarily focuses on the air intake stage and has significant shortcomings in its dust removal function. In the chlorine system of a multipolar magnesium electrolysis cell, baghouse dust collectors face more complex and demanding operating conditions. The dust entrained in chlorine gas is not only fine in particle size but also corrosive, making it extremely easy for dust to adhere to the surface of the bags, and conventional cleaning methods are insufficient to completely remove it. Traditional cleaning methods, such as manual cleaning, are extremely labor-intensive, and operating in a chlorine environment poses a serious threat to the health and safety of workers. Even with the adoption of some automated dust removal technologies, the lack of sufficient consideration of the special characteristics of the magnesium electrolysis cell chlorine system and the imprecise control of the timing and intensity of dust removal often lead to problems such as over-duration, which causes increased wear on the filter bags and shortens their service life, or insufficient dust accumulation, which increases system resistance, affects chlorine transport efficiency, and may even cause safety accidents. Utility Model Content

[0004] The purpose of this invention is to provide an automatic dust removal system for a bag filter in a chlorine system of a multipolar magnesium electrolytic cell, in order to solve the problem mentioned in the background art that the dust mixed in the chlorine gas is not only fine in particle size, but also has a certain degree of corrosiveness, which makes it easy for dust to adhere to the surface of the filter bag, and conventional dust removal methods are difficult to completely remove it.

[0005] To achieve the above objectives, this utility model provides an automatic dust removal system for a bag filter dust collector in a chlorine system of a multipolar magnesium electrolytic cell. The system includes a housing; a blowpipe is installed inside the upper part of the housing, and a filter bag is connected to the lower end of the blowpipe; one side of the housing is connected to the electrolytic cell via a chlorine inlet pipe, on which a main valve is installed; a backup dust removal system is also connected externally via a branch pipe to the housing connected to the electrolytic cell, and a switch valve is installed on the branch pipe; a conical dust collection bin is located inside the lower part of the housing, and a dust collection box is connected to the bottom of the dust collection bin via a pipe, on which a dust discharge valve is installed.

[0006] This device uses the outer casing as its main body, with the blowpipes and filter bags forming the core dust removal unit. Chlorine gas is introduced into the pipeline and connected to the electrolytic cell, allowing dust-laden chlorine gas to enter the dust collector. The main valve controls the flow of chlorine gas. A backup dust removal system is connected to the external pipeline to provide dust removal assurance. Dust collection bins and dust collection boxes collect dust through ash discharge valves.

[0007] Preferably, one side of the outer casing is connected to an alkaline washing system via a pipeline, and a switch valve is installed on the pipeline to draw the residual chlorine gas in the bag filter to the alkaline washing system for washing and absorption, preventing the residual chlorine gas from overflowing during the opening of the ash discharge valve.

[0008] This feature is equipped with an external alkaline washing system, which is controlled by a switch valve. It is turned on before ash discharge to draw residual chlorine gas from the dust collector into the alkaline washing system. The residual chlorine gas is then removed by the neutralization reaction between the alkaline solution and the chlorine gas.

[0009] Preferably, the blowing pipe is connected to a chlorine compressor via a circulation pipeline.

[0010] This setup connects the blowpipe to the chlorine compressor via a circulation pipeline. The pressure generated by the chlorine compressor is used to deliver chlorine gas to the blowpipe, providing a power source for dust removal.

[0011] Preferably, the input pipeline of the chlorine compressor is connected to one end of the injection pipe, and the output end of the chlorine compressor is divided into two pipelines. The first pipeline is connected to the other end of the injection pipe, and the second pipeline is connected to the chlorination process. Both pipelines are equipped with switch valves. The switch valve on the second pipeline is normally open and is used to continuously supply chlorine gas from the electrolytic anode to the chlorination process.

[0012] This setup divides the output of the chlorine compressor into two lines. The first line connects to the blowpipe for ash removal, and the second line connects to the chlorination process. The normally open valve on the second line ensures that chlorine gas from the electrolytic anode is continuously supplied to subsequent processes, so that ash removal and chlorine supply for production do not interfere with each other.

[0013] Preferably, an ash silo level gauge and a vibrator are installed on one side of the ash collection silo, and a differential pressure transmitter is installed on the outside of one side of the housing.

[0014] This system includes a ash hopper level gauge to monitor the dust level in the ash hopper in real time, a vibrator to assist in cleaning and discharging ash through vibration, and a differential pressure transmitter to monitor the pressure difference between the top and bottom of the bag filter to reflect the bag blockage status.

[0015] Preferably, the system also includes a DCS control unit. The DCS control unit receives signals from the differential pressure transmitter and the ash hopper level gauge. The differential pressure transmitter monitors the differential pressure value across the bag filter. When the differential pressure value exceeds the process control limit, the DCS control unit controls the opening of the valve in the circulation pipeline through the feedback signal from the differential pressure transmitter. Positive pressure chlorine gas from the rear end of the chlorine compressor is then injected into the filter bags through the blowpipe. At the same time, the vibrator is activated. The blowing and vibration remove the dust adhering to the surface of the filter bags and dislodge it into the ash collection hopper at the bottom of the bag filter. After the differential pressure of the filter bags returns to normal, the valve in the circulation pipeline is closed, and the vibrator is turned off.

[0016] This setting allows the DCS control unit to receive signals from the differential pressure transmitter and the ash silo level gauge. When the differential pressure exceeds the upper limit, it controls the circulation pipeline valve to open, starts the chlorine compressor's blowing and rapping devices to remove dust from the surface of the filter bags; after the differential pressure returns to normal, it shuts down the relevant components.

[0017] Preferably, when the accumulated dust in the ash collection hopper reaches the upper limit of the ash hopper level gauge, a signal is fed back to the DCS control unit. The DCS control unit then operates to open the switch valve on the branch pipeline of the external backup dust removal system, while simultaneously closing the main valve on the chlorine inlet pipeline, thereby automatically switching to the backup dust removal system. At the same time, the switch valve on the pipeline of the alkaline washing system is opened, and the residual chlorine in the bag filter is drawn into the alkaline washing system for washing and absorption. After 10 minutes of suction, the DCS control unit closes the switch valve on the pipeline of the alkaline washing system through signal feedback, and simultaneously starts the vibrator and opens the ash discharge valve to shake the dust in the ash collection hopper into the sealed dust collection box.

[0018] When the dust level in the ash collection silo reaches the upper limit of the level gauge, the DCS control unit switches to the backup dust removal system, closes the main valve, starts the alkaline washing system to treat the residual chlorine gas, and then starts the vibrator and ash discharge valve to discharge the ash.

[0019] Preferably, when the level gauge of the ash hopper reaches the lower limit of the process control, the DCS control unit controls the ash discharge valve to close through signal feedback, and at the same time shuts down the vibrator, thus completing the automatic ash removal of the bag filter.

[0020] When the ash silo level gauge detects that the dust level has reached the lower limit, the DCS control unit will shut down the ash discharge valve and the vibrator to end the ash cleaning process.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] This automatic dust removal system for baghouse dust collectors in multipolar magnesium electrolysis cell chlorine systems utilizes a DCS control unit combined with feedback signals from a differential pressure transmitter and an ash hopper level gauge to achieve a fully automatic dust removal process. When the baghouse differential pressure exceeds the upper limit, the system automatically triggers positive pressure chlorine gas injection from the chlorine compressor and simultaneously starts the vibrator, avoiding over- or under-cleaning. This extends the service life of the baghouse, reduces system resistance, and improves chlorine transport efficiency. An external backup dust removal system and an alkaline washing system ensure continuous operation of the dust collector during main system dust removal or ash discharge. When the dust level in the ash collection hopper reaches the upper limit, the system automatically switches to the backup dust removal system, while the alkaline washing system treats residual chlorine, effectively solving the problem of chlorine leakage during traditional ash discharge. The conical ash collection hopper and sealed dust collection box design, combined with the vibrator-assisted ash discharge, ensures leak-free dust collection, meeting environmental protection requirements and effectively improving the environmental quality of the workshop and surrounding area.

[0023] The design of the chlorine compressor's circulation pipeline allows the chlorine used in the ash removal process to be recycled back to the chlorination process, achieving zero resource waste and reducing enterprise production costs. The entire ash removal and discharge process is fully automated by the DCS control unit, requiring no manual intervention, reducing maintenance manpower, and avoiding the health threats posed by the chlorine environment to operators. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 2 This is a partial structural schematic diagram of the present invention;

[0026] The meanings of the labels in the diagram are as follows:

[0027] 1. Outer shell; 11. Ash collection silo; 12. Dust collection box; 13. Ash discharge valve; 14. Alkali washing system; 15. Chlorine inlet pipeline; 151. Main valve; 2. Filter bag; 3. Pulse pipe; 4. Vibrator; 5. Ash silo level gauge; 6. Differential pressure transmitter; 7. Backup ash cleaning system; 71. Branch pipeline; 8. DCS control unit; 9. Chlorine compressor; 10. Electrolytic cell. Detailed Implementation

[0028] 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.

[0029] This utility model provides an automatic dust removal system device for a bag filter dust collector in a chlorine system of a multipolar magnesium electrolytic cell, such as... Figure 1 , Figure 2 As shown, the device includes an outer shell 1. A blowpipe 3 is installed inside the upper part of the outer shell 1. A filter bag 2 is connected to the lower end of the blowpipe 3. One side of the outer shell 1 is connected to the electrolytic cell 10 through a chlorine gas inlet pipe 15. A main valve 151 is installed on the chlorine gas inlet pipe 15. A backup dust removal system 7 is also connected to the outer shell 1 to the electrolytic cell 10 through a branch pipe 71. The backup dust removal system 7 generally adopts a conventional bag filter dust collector. A switch valve is installed on the branch pipe 71. A conical dust collection bin 11 is set inside the lower end of the outer shell 1. A dust collection box 12 is connected to the bottom of the dust collection bin 11 through a pipe, and a dust discharge valve 13 is installed on the pipe.

[0030] The outer casing 1 serves as the main body of the device. The blowpipe 3 and filter bag 2 inside form the core dust removal unit. Chlorine gas is introduced through pipe 15, which connects to the electrolytic cell 10, allowing dust-laden chlorine gas to enter the dust collector. The main valve 151 controls the flow of chlorine gas. A branch pipe 71 connects to a backup dust removal system 7, providing dust removal assurance. The ash collection bin 11 and dust collection box 12 collect dust through the ash discharge valve 13. This establishes a complete basic structure for chlorine dust removal and dust collection. The backup dust removal system 7 ensures continuous operation of the device, preventing production interruptions due to dust removal. The conical ash collection bin 11 is designed to facilitate natural dust fall and centralized collection.

[0031] In this embodiment, as Figure 1 As shown, one side of the outer casing 1 is connected to an alkaline washing system 14 via a pipeline, and a switch valve is installed on the pipeline to draw the residual chlorine gas in the bag filter to the alkaline washing system for washing and absorption, preventing the residual chlorine gas from overflowing during the opening of the ash discharge valve 13.

[0032] The outer casing 1 is connected to an external alkaline washing system 14, controlled by a switch valve. It is activated before ash discharge to draw residual chlorine gas from the dust collector into the alkaline washing system 14. The alkaline solution neutralizes the chlorine gas, removing the residual chlorine. This completely eliminates the risk of chlorine leakage during ash discharge, ensuring operator safety and environmental protection, and preventing chlorine pollution of the air.

[0033] Specifically, such as Figure 1 As shown, the blow pipe 3 is connected to the chlorine compressor 9 through a circulation pipeline.

[0034] The blowpipe 3 is connected to the chlorine compressor 9 via a circulation pipeline. The pressure generated by the chlorine compressor 9 is used to deliver chlorine gas to the blowpipe 3, providing a power source for dust removal. This achieves self-sufficiency in dust removal power, eliminating the need for an additional gas source, reducing equipment costs and energy consumption, while ensuring a stable chlorine supply during the dust removal process.

[0035] Furthermore, such as Figure 1 , Figure 2As shown, the input pipe of the chlorine compressor 9 is connected to one end of the blow pipe 3. The output end of the chlorine compressor 9 is divided into two pipes. The first pipe is connected to the other end of the blow pipe 3, and the second pipe is connected to the chlorination process. Both pipes are equipped with switch valves. The switch valve on the second pipe is normally open and is used to continuously supply chlorine gas from the electrolytic anode to the chlorination process.

[0036] The output of the chlorine compressor 9 is divided into two lines. The first line connects to the blowpipe 3 for ash removal, and the second line connects to the chlorination process. The normally open valve on the second line ensures a continuous supply of chlorine gas from the electrolytic anode to subsequent processes, preventing ash removal and chlorine supply from interfering with each other. This ensures the ash removal function while maintaining normal production of the chlorination process, improving chlorine utilization, and achieving rational resource allocation.

[0037] Furthermore, such as Figure 1 As shown, an ash silo level gauge 5 and a vibrator 4 are installed on one side of the ash collection silo 11, and a differential pressure transmitter 6 is installed on the outside of one side of the outer casing 1.

[0038] The ash hopper level gauge 5 monitors the dust level in the ash collection hopper 11 in real time, and the vibrator 4 assists in ash cleaning and discharge through vibration; the differential pressure transmitter 6 monitors the pressure difference between the upper and lower parts of the bag filter, reflecting the clogging status of the filter bags 2. This provides data for automatic ash cleaning and discharge, enables precise control, improves ash cleaning efficiency, and prevents excessive dust accumulation from affecting the dust removal effect and equipment operation.

[0039] Furthermore, such as Figure 1 As shown, it also includes a DCS control unit 8. The DCS control unit 8 receives signals from the differential pressure transmitter 6 and the ash hopper level gauge 5. The differential pressure transmitter 6 monitors the differential pressure value between the upper and lower parts of the bag filter. When the differential pressure value exceeds the upper limit of the process control, the DCS control unit 8 controls the opening of the switching valve of the circulation pipeline through the feedback signal of the differential pressure transmitter 6. Positive pressure chlorine gas at the rear end of the chlorine compressor 9 is sprayed onto the filter bag 2 through the blowpipe 3. At the same time, the vibrator 4 is started. Through blowing and vibration, the dust adhering to the surface of the filter bag 2 is removed to the ash collection hopper 11 at the bottom of the bag filter. After the differential pressure of the filter bag 2 returns to normal, the switching valve of the circulation pipeline is closed, and the vibrator 4 is turned off.

[0040] The DCS control unit 8 receives signals from the differential pressure transmitter 6 and the ash hopper level gauge 5. When the differential pressure exceeds the upper limit, it controls the circulation pipeline valve to open, starts the chlorine compressor 9 to blow air and the vibrator 4 to remove dust from the surface of the filter bag 2; after the differential pressure returns to normal, it shuts down the relevant components. This achieves automated and intelligent dust removal, cleaning in a timely manner according to the actual dust blockage, avoiding over- or under-cleaning, extending the service life of the filter bag 2, and maintaining stable system operation.

[0041] Furthermore, such as Figure 1As shown, when the accumulated dust in the ash collection bin 11 reaches the upper limit of the monitoring value of the ash bin level gauge 5, the signal is fed back to the DCS control unit 8. The DCS control unit 8 operates the switch valve on the branch pipeline of the external backup dust removal system to open, and at the same time closes the main valve on the chlorine gas inlet pipeline, thereby realizing automatic switching to the backup dust removal system 7. At the same time, the pipeline switch valve of the alkaline washing system 14 is opened, and the residual chlorine gas in the bag filter is drawn to the alkaline washing system for washing and absorption. After 10 minutes of suction, the DCS control unit 8 closes the pipeline switch valve of the alkaline washing system 14 through signal feedback, and at the same time starts the vibrator 4 and opens the ash discharge valve 13, shaking the dust in the ash collection bin 11 into the sealed dust collection box 12.

[0042] When the dust level in the ash collection hopper 11 reaches the upper limit of the level gauge 5, the DCS control unit 8 switches to the standby dust removal system 7, closes the main valve 151, and starts the alkaline washing system 14 to treat residual chlorine gas. After completion, the vibrator 4 and the ash discharge valve 13 are started to discharge ash. This ensures continuous operation of the dust collector and avoids production disruptions caused by the main system's dust removal process; it also ensures the safe handling of residual chlorine gas and guarantees no chlorine gas leakage during the ash discharge process, achieving safe and efficient dust discharge.

[0043] Furthermore, such as Figure 1 As shown, when the level gauge 5 in the ash hopper reaches the lower limit of the process control, the DCS control unit 8 controls the ash discharge valve 13 to close through signal feedback, and at the same time shuts down the vibrator 4, thus completing the automatic cleaning of the bag filter.

[0044] When the ash hopper level gauge 5 detects that the dust level has reached the lower limit, the DCS control unit 8 controls the ash discharge valve 13 and the vibrator 4 to close, ending the ash removal process. Precise control of the ash discharge process prevents energy waste and equipment damage from continued operation after the dust has been discharged, ensuring a complete and efficient end to the ash removal process.

[0045] In operation, the automatic dust removal system for a bag filter in a chlorine system of a multipolar magnesium electrolytic cell, as described in this invention, firstly, the dust-laden chlorine gas generated by the electrolytic cell 10 enters the outer casing 1 through the chlorine gas inlet pipe 15, with the main valve 151 open. As the dust-laden chlorine gas passes through the filter bag 2 connected below the blowpipe 3, the dust is trapped on the surface of the filter bag, while the clean chlorine gas continues to flow through the bag. During this process, the second pipeline valve at the output end of the chlorine compressor 9 remains open, continuously supplying the purified chlorine gas to the chlorination process, maintaining the continuity of the production flow.

[0046] During operation, the differential pressure transmitter 6 continuously monitors the differential pressure value across the bag filter, and the ash hopper level gauge 5 monitors the dust height in the ash collection hopper 11 in real time and feeds the data back to the DCS control unit 8. When the differential pressure value monitored by the differential pressure transmitter 6 exceeds the process control limit, it indicates that too much dust has accumulated on the surface of the filter bag 2, hindering the passage of chlorine gas. At this time, the DCS control unit 8 starts the dust removal program. If the ash hopper level gauge 5 detects that the accumulated dust height in the ash collection hopper 11 has reached the upper limit, it means that the ash collection hopper is about to be full, and the DCS control unit 8 will also start the corresponding processing program.

[0047] When the differential pressure triggers the dust removal process, the DCS control unit 8 opens the valves of the circulation pipeline. Positive-pressure chlorine gas from the rear of the chlorine compressor 9 is then injected through the blowpipe 3 onto the filter bags 2. The powerful airflow loosens the dust adhering to the surface of the bags. Simultaneously, the vibrator 4 activates, further dislodging the dust from the bags through vibration, ultimately collecting it in the dust collection bin 11 at the bottom of the baghouse dust collector. Once the differential pressure on the filter bags 2 returns to normal, the DCS control unit 8 closes the valves of the circulation pipeline and simultaneously shuts off the vibrator 4, completing one dust removal operation.

[0048] If the ash hopper level gauge 5 detects that the dust level in the ash collection hopper 11 has reached its upper limit, the DCS control unit 8 operates the switch valve on the external backup dust removal system 7 to open, while simultaneously closing the main valve 151 on the chlorine inlet pipe 15, automatically switching to the backup dust removal system 7 to ensure uninterrupted chlorine dust removal. Subsequently, the DCS control unit 8 opens the pipeline switch valve of the alkaline washing system 14, drawing the residual chlorine in the bag filter to the alkaline washing system for washing and absorption, using the neutralization reaction between the alkali solution and chlorine to eliminate the residual chlorine. After 10 minutes, the residual chlorine is basically treated, and the DCS control unit 8 closes the pipeline switch valve of the alkaline washing system 14 through signal feedback, while simultaneously starting the vibrator 4 and opening the ash discharge valve 13. With the vibration assistance of the vibrator 4, the dust in the ash collection hopper 11 is shaken down into the sealed dust collection box 12.

[0049] When the level gauge 5 in the ash hopper reaches the lower limit of the process control, it indicates that the dust in the ash collection hopper 11 has been basically emptied. The DCS control unit 8 controls the ash discharge valve 13 to close through signal feedback, and at the same time shuts down the vibrator 4, completing the entire automatic dust removal process of the bag filter. The device returns to the initial dust removal operation state and continues to cycle through the dust-containing chlorine gas dust removal, monitoring and dust removal.

[0050] Finally, it should be noted that the electronic components in the above-mentioned components, such as the vibrator 4 and the ash hopper level gauge 5, are all general standard parts or components known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. In the idle part of this device, all the above-mentioned electrical components are connected by wires. The specific connection method should refer to the working order between the electrical components in the above working principle to complete the electrical connection. All of these are technologies known in the art.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An automatic dust removal system device for a bag filter in a chlorine system of a multipolar magnesium electrolytic cell, comprising a housing (1), characterized in that: A blowpipe (3) is installed inside the upper part of the outer shell (1). A cloth bag (2) is connected to the lower end of the blowpipe (3). One side of the outer shell (1) is connected to the electrolytic cell (10) through a chlorine inlet pipe (15). A main valve (151) is installed on the chlorine inlet pipe (15). A backup dust removal system (7) is also connected to the outer shell (1) and the electrolytic cell (10) through a branch pipe (71). A switch valve is installed on the branch pipe (71). A conical dust collection bin (11) is set inside the lower end of the outer shell (1). A dust collection box (12) is connected to the bottom of the dust collection bin (11) through a pipe. A dust discharge valve (13) is installed on the pipe.

2. The device for automatic dust cleaning system of bag-type dust collector for chlorine gas system of multi-polarity magnesium electrolytic cell according to claim 1, characterized in that: One side of the outer shell (1) is connected to an alkaline washing system (14) via a pipeline, and a switch valve is installed on the pipeline to draw the residual chlorine gas in the bag filter to the alkaline washing system for washing and absorption, so as to prevent the residual chlorine gas from overflowing during the opening of the ash discharge valve (13).

3. The device for automatic dust cleaning system of bag filter for chlorine gas system of multi-polarity magnesium electrolytic cell according to claim 2, characterized in that: The blow pipe (3) is connected to a chlorine compressor (9) via a circulation pipeline.

4. The device for automatic dust cleaning system of bag-type dust collector of chlorine gas system for multi-polarity magnesium electrolytic cell of claim 3, characterized in that: The input pipe of the chlorine compressor (9) is connected to one end of the blow pipe (3). The output end of the chlorine compressor (9) is divided into two pipes. The first pipe is connected to the other end of the blow pipe (3), and the second pipe is connected to the chlorination process. Both pipes are equipped with switch valves. The switch valves on the second pipe are normally open and are used to continuously supply chlorine gas from the electrolytic anode to the chlorination process.

5. The device for automatic dust cleaning system of bag filter for chlorine gas system of multi-polarity magnesium electrolytic cell according to claim 4, characterized in that: A ash silo level gauge (5) and a vibrator (4) are installed on one side of the ash silo (11), and a differential pressure transmitter (6) is installed on the outside of one side of the outer casing (1).

6. The automatic dust removal system device for a bag filter in a chlorine system of a multipolar magnesium electrolytic cell according to claim 5, characterized in that: It also includes a DCS control unit (8), which receives signals from a differential pressure transmitter (6) and a ash hopper level gauge (5). The differential pressure transmitter (6) monitors the pressure difference between the upper and lower parts of the bag filter. When the pressure difference exceeds the upper limit of the process control, the DCS control unit (8) controls the opening of the valve of the circulation pipeline through the feedback signal of the differential pressure transmitter (6). The positive pressure chlorine gas at the rear end of the chlorine compressor (9) is sprayed onto the filter bag (2) through the blowpipe (3), and the vibrator (4) is started at the same time. The dust adhering to the surface of the filter bag (2) is removed to the ash collection hopper (11) at the bottom of the bag filter through the blowing and vibration. After the pressure difference of the filter bag (2) returns to normal, the valve of the circulation pipeline is closed, and the vibrator (4) is turned off.

7. The device for automatic dust cleaning system of bag filter for chlorine gas system of multi-polarity magnesium electrolytic cell according to claim 6, characterized in that: When the dust accumulation in the ash collection bin (11) reaches the upper limit of the monitoring value of the ash bin level gauge (5), the signal is fed back to the DCS control unit (8). The DCS control unit (8) operates to open the switch valve on the branch pipeline of the external backup dust removal system and closes the main valve on the chlorine gas inlet pipeline, thereby realizing automatic switching to the backup dust removal system (7). At the same time, the pipeline switch valve of the alkaline washing system (14) is opened to draw the residual chlorine gas in the bag filter to the alkaline washing system for washing and absorption. After 10 minutes of suction, the DCS control unit (8) closes the pipeline switch valve of the alkaline washing system (14) through signal feedback, and at the same time starts the vibrator (4) and opens the ash discharge valve (13) to shake the dust in the ash collection bin (11) into the sealed dust collection box (12).

8. The device for automatic dust cleaning system of bag-type dust collector of chlorine gas system for multi-polarity magnesium electrolytic cell of claim 7, characterized in that: When the level gauge (5) of the ash hopper reaches the lower limit of the process control, the DCS control unit (8) controls the ash discharge valve (13) to close through signal feedback, and at the same time closes the vibrator (4) to complete the automatic cleaning of the bag filter.

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