System device for automatically regulating and controlling pressure of chlorine header pipe in magnesium electrolysis production

Abstract

The invention relates to the technical field of magnesium electrolysis production, in particular to a system device for automatically regulating and controlling the pressure of a chlorine main pipe in magnesium electrolysis production, which comprises the chlorine main pipe, a chlorine distribution table, a chlorine compressor and a defoaming machine, the pressure transmitter is arranged on the chlorine main pipe and is used for monitoring the pressure of the chlorine main pipe; a first pneumatic corrugated pipe adjusting valve and a second pneumatic corrugated pipe adjusting valve. Through interlocking control of the DCS control system, the pressure transmitter and the pneumatic control valve, automatic adjustment of the negative pressure of the chlorine gas header pipe is achieved, manual intervention is not needed, and the control efficiency and accuracy are greatly improved. The system can monitor the pressure of the chlorine main pipe in real time and automatically adjust the opening degree of the pneumatic adjusting valve according to a set value, so that the negative pressure value of the chlorine main pipe is effectively controlled to fluctuate within a set range, and the problems of frequent pressure fluctuation and large fluctuation range in a traditional manual control mode are solved.

Description

Technical Field

[0001] The invention relates to the technical field of magnesium electrolysis production, in particular to a system device for automatically regulating the pressure of a chlorine main pipe in magnesium electrolysis production. Background Art

[0002] In the production process of multipolar magnesium electrolytic cells, the treatment of anode chlorine is a key link. The chlorine compressor generates negative pressure at the front end, sucking the anode chlorine generated during the operation of the electrolytic cell into the chlorine treatment system for compression and purification; while it generates positive pressure at the back end, supplying the compressed and purified chlorine to the subsequent chlorination process. When the electrolytic cell is operating normally, maintaining a suitable main pipe pressure is the basic condition to ensure the smooth operation of the electrolysis-chlorination process.

[0003] However, the control of the pressure of the chlorine main pipe of the electrolytic cell faces many challenges. If the pressure is controlled too high, the air around the electrolytic cell may be sucked into the electrolytic cell, which will not only aggravate the combustion and oxidation of the liquid magnesium and affect the operating current efficiency of the electrolytic cell, but also accelerate the accumulation of slag, thereby shortening the operating life of the electrolytic cell. At the same time, the air sucked into the chlorine system will also affect the concentration of chlorine, thereby affecting the stable operation of the chlorination process. In addition, the high negative pressure control of the chlorine main pipe will also lead to an increase in the volatilization loss of molten electrolyte components and increase the frequency of cleaning the chlorine system.

[0004] On the contrary, if the negative pressure of the electrolytic cell chlorine main pipe is controlled too low, the anode chlorine may overflow from the slot, deteriorating the on-site working environment. At the same time, too low a negative pressure in the main pipe will also cause the anode chlorine to not be pumped away in time, and the chlorine will react with the small magnesium beads produced by electrolysis, which can easily lead to the electrolytic cell being hot, and will also affect the operating current efficiency of the electrolytic cell.

[0005] In the actual production process, the instantaneous flow rate of anode chlorine gas produced by the electrolytic cell will fluctuate with the consumption of magnesium chloride components. At the same time, the normal feeding and magnesium extraction operations of the electrolytic cell will also cause fluctuations in the instantaneous flow rate of chlorine gas. Such frequent fluctuations will seriously affect the smooth operation of the chlorination-electrolysis process of the full-process titanium sponge production enterprise.

[0006] At present, in the magnesium electrolysis process of full-process titanium sponge production enterprises, the control of the negative pressure of the chlorine main pipe of the electrolytic cell mainly relies on manual switch to adjust the valve opening in front of the chlorine compressor. However, due to the unstable chlorine flow rate, frequent fluctuations and large range in the magnesium electrolysis production process, operators are required to monitor and adjust on site 24 hours a day. At the same time, it is difficult to accurately control the opening of the control valve by manual operation alone, and the opening is often not adjusted enough or too much, resulting in the negative pressure of the chlorine main pipe often exceeding the control index range, seriously affecting the stable operation of the electrolysis-chlorination process.

[0007] In addition, the chlorine compressor room in the magnesium electrolysis production process belongs to a high-risk production area involving chlorine and acid, which poses a great safety risk. In order to overcome the shortcomings of the prior art and reduce the safety production risk, the present invention designs and provides an automatic negative pressure adjustment control system for the chlorine main pipe of the electrolytic cell. Summary of the invention

[0008] The purpose of the present invention is to provide a system device for automatically regulating the pressure of the chlorine main pipe in magnesium electrolysis production, so as to solve the problems raised in the above background technology that the chlorine flow rate in the magnesium electrolysis production process is unstable, fluctuates frequently and over a large range, and requires operators to monitor and adjust on site 24 hours a day.

[0009] To achieve the above object, the present invention provides a system device for automatically regulating the pressure of a chlorine main pipe in magnesium electrolysis production, comprising a chlorine main pipe, a chlorine distribution table, a chlorine compressor, and a defoamer;

[0010] A pressure transmitter, which is installed on the chlorine main pipe and is used to monitor the pressure of the chlorine main pipe;

[0011] a first pneumatic bellows regulating valve and a second pneumatic bellows regulating valve, wherein the first pneumatic bellows regulating valve is installed on the chlorine circulation pipeline inside the chlorine compressor, the output end of the defoamer is also connected through a lead-out branch pipe, and the second pneumatic bellows regulating valve is installed on the lead-out branch pipe for adjusting the chlorine flow;

[0012] A DCS automatic control system is interlocked with a pressure transmitter, a pneumatic regulating valve and a pneumatic bellows regulating valve, and automatically calculates and controls the openings of the first pneumatic bellows regulating valve and the second pneumatic bellows regulating valve according to the pressure value of the chlorine main pipe monitored by the pressure transmitter, so as to realize automatic, timely and accurate control of the negative pressure value of the chlorine main pipe.

[0013] As a preferred embodiment of the present invention, a manual regulating valve is further included. The manual regulating valve is installed on the outlet branch pipe at the rear end of the defoamer and is in a normally open state for assisting in regulating the flow rate of chlorine.

[0014] As a preferred embodiment of the present invention, a chlorine main pressure control module is set in the DCS automatic control system to control the upper and lower limits of the chlorine main pressure. When the pressure transmitter monitors that the chlorine main pressure exceeds the set upper and lower limits, the DCS automatic control system automatically calculates and controls the opening of the first pneumatic bellows regulating valve and the second pneumatic bellows regulating valve according to the deviation value, thereby controlling the chlorine flow rate to offset the pressure exceeding the set value.

[0015] As a preferred embodiment of the present invention, the first pneumatic bellows regulating valve and the second pneumatic bellows regulating valve adjust the chlorine flow rate to achieve automatic regulation and control of the negative pressure value of the chlorine main pipe, thereby ensuring the smooth operation of the electrolytic cell.

[0016] As a preferred embodiment of the present invention, the output end of the chlorine main pipe is connected to the input end of the chlorine distribution table, the output end of the chlorine distribution table is connected to the input end of the chlorine compressor, the output end of the chlorine compressor is connected to the input end of the defoamer, and the output end of the defoamer is connected to the input end of the chlorination process.

[0017] As a preferred solution of the present invention, a manual bellows-sealed stop valve is installed on the pipeline between the chlorine gas distribution station and the chlorine compressor.

[0018] As a preferred embodiment of the present invention, the DCS automatic control system further includes an automatic adjustment module and an alarm module. The automatic adjustment module is used to calculate and control the opening sizes of the first pneumatic bellows regulating valve and the second pneumatic bellows regulating valve according to the chlorine main pipe pressure value monitored in real time by the pressure transmitter through a preset algorithm to achieve accurate control of the negative pressure value of the chlorine main pipe; the alarm module is used to send an alarm signal to remind the operator to take corresponding measures when the pressure transmitter monitors that the chlorine main pipe pressure value exceeds a preset safety range.

[0019] As a preferred embodiment of the present invention, a sedimentation trough is provided at the bottom of the middle section of the lead-out branch pipe, a slope is installed on one side of the upper opening of the sedimentation trough, a filter screen is installed on the outside of one side of the sedimentation trough, a rotating shaft is installed horizontally inside the sedimentation trough, a spiral pusher is installed on the rotating shaft, a debris discharge port is provided at the bottom of one side of the sedimentation trough, and the rotating shaft is driven to rotate by a motor.

[0020] As a preferred embodiment of the present invention, the method for controlling the negative pressure of the chlorine main pipe by adjusting the chlorine flow rate returned to the chlorine distribution station is as follows:

[0021] S1. Install a manual regulating valve and a second pneumatic bellows regulating valve on the outlet branch pipe at the rear end of the defoamer, and connect the other end of the outlet branch pipe to the chlorine gas distribution table in front of the chlorine compressor;

[0022] S2. Install a pressure transmitter on the chlorine main pipe to monitor the pressure of the chlorine main pipe in real time;

[0023] S3, interlocking control of the pressure transmitter, the second pneumatic bellows regulating valve and the DCS automatic control system;

[0024] S4. Set the upper and lower limit control values ​​of the chlorine main pipe pressure in the DCS automatic control system;

[0025] S5. When the pressure transmitter detects that the pressure of the chlorine main pipe exceeds the upper and lower limits set by the DCS automatic control system, the DCS automatic control system automatically calculates and controls the opening size of the second pneumatic bellows regulating valve according to the size of the deviation value, thereby adjusting the chlorine flow rate returning to the chlorine distribution station to offset the pressure part that exceeds the set value, thereby realizing automatic, timely and accurate control of the negative pressure value of the electrolytic cell chlorine main pipe.

[0026] As a preferred embodiment of the present invention, the method for controlling the negative pressure of the chlorine main pipe by adjusting the chlorine flow rate at the chlorine compressor outlet to return to the chlorine compressor inlet is as follows:

[0027] T1. Install the first pneumatic bellows regulating valve on the chlorine gas circulation pipeline inside the chlorine compressor;

[0028] T2. Interlock the pressure transmitter, the first pneumatic bellows regulating valve and the DCS automatic control system;

[0029] T3. Set the upper and lower limit control values ​​of the chlorine main pipe pressure in the DCS automatic control system;

[0030] T4. When the pressure transmitter detects that the pressure of the chlorine main pipe exceeds the upper and lower limits of the DCS automatic control system, the DCS automatic control system automatically calculates and controls the opening size of the first pneumatic bellows regulating valve according to the size of the deviation value, thereby adjusting the chlorine flow at the outlet of the chlorine compressor back to the inlet of the chlorine compressor to offset the pressure part that exceeds the set value, thereby realizing automatic, timely and accurate control of the negative pressure value of the chlorine main pipe of the electrolytic cell.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. In the system device for automatically controlling the pressure of the chlorine main pipe in magnesium electrolysis production, the system realizes automatic adjustment of the negative pressure of the chlorine main pipe through the interlocking control of the DCS control system, pressure transmitter and pneumatic control valve, without manual intervention, greatly improving the control efficiency and accuracy.

[0033] 2. In the system device for automatically controlling the pressure of the chlorine main pipe in magnesium electrolysis production, the system can monitor the pressure of the chlorine main pipe in real time, and automatically adjust the opening of the pneumatic control valve according to the set value, so as to effectively control the negative pressure value of the chlorine main pipe to fluctuate within the set range, reducing the problems of frequent pressure fluctuations and large fluctuation ranges in the traditional manual control mode. When the pressure of the chlorine main pipe deviates from the set value, the system can respond quickly and automatically adjust the opening of the pneumatic control valve to offset the pressure that exceeds the set value, thereby realizing timely and accurate control of the negative pressure of the chlorine main pipe. The automated control of the system reduces the need for manual on-site monitoring and adjustment, and reduces the safety risks faced by operators, especially in high-risk production areas involving chlorine and acid, realizing unmanned control and greatly improving the level of safe production.

[0034] 3. In the system device for automatically controlling the pressure of the chlorine main pipe in magnesium electrolysis production, by accurately controlling the negative pressure of the chlorine main pipe, the system helps to maintain the smooth operation of the electrolysis-chlorination process, improves the operating current efficiency of the electrolytic cell, and reduces production problems caused by chlorine pressure fluctuations, such as slag accumulation and chlorine concentration fluctuations. The system effectively prevents the anode chlorine from overflowing from the slot, improves the on-site working environment, and reduces the secondary reaction of chlorine with small magnesium beads produced by electrolysis, reducing the risk of hot tanks in the electrolytic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0036] Figure 2 It is a schematic diagram of the internal structure of the branch pipe in the present invention;

[0037] The meaning of each number in the figure is:

[0038] 1. Pressure transmitter; 2. Manual bellows sealed stop valve; 3. First pneumatic bellows regulating valve; 4. Manual regulating valve; 5. Second pneumatic bellows regulating valve; 6. DCS automatic control system; 7. Chlorine main pipe; 8. Chlorine distribution table; 9. Chlorine compressor; 10. Defoamer; 11. Chlorination process; 12. Lead-out branch pipe; 121. Sedimentation tank; 122. Slope; 123. Rotating shaft; 124. Spiral pusher; 125. Impurity discharge port; 126. Motor; 13. Filter. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] The present invention provides a system device for automatically regulating the pressure of the chlorine main pipe in magnesium electrolysis production, such as Figure 1-Figure 2 As shown, it includes a chlorine main pipe 7, a chlorine distribution table 8, a chlorine compressor 9, and a defoamer 10;

[0041] A pressure transmitter 1 is installed on the chlorine main pipe 7 and is used to monitor the pressure of the chlorine main pipe 7;

[0042] A first pneumatic bellows regulating valve 3 and a second pneumatic bellows regulating valve 5. The first pneumatic bellows regulating valve 3 is installed on the chlorine gas circulation pipeline inside the chlorine compressor 9. The output end of the defoamer 10 is also connected through the lead-out branch pipe 12. The second pneumatic bellows regulating valve 5 is installed on the lead-out branch pipe 12 to adjust the chlorine gas flow rate;

[0043] The DCS automatic control system 6 is interlocked with the pressure transmitter 1, the pneumatic regulating valve 3 and the pneumatic bellows regulating valve 5. According to the pressure value of the chlorine main pipe monitored by the pressure transmitter 1, the opening sizes of the first pneumatic bellows regulating valve 3 and the second pneumatic bellows regulating valve 5 are automatically calculated and controlled to realize automatic, timely and accurate control of the negative pressure value of the chlorine main pipe 7.

[0044] In this embodiment, a manual regulating valve 4 is also included. The manual regulating valve 4 is installed on the outlet branch pipe 12 at the rear end of the defoamer 10 and is in a normally open state for assisting in regulating the flow rate of chlorine gas.

[0045] Specifically, a chlorine main pressure control module is set in the DCS automatic control system 6 to control the upper and lower limits of the chlorine main pressure. When the pressure transmitter 1 detects that the pressure of the chlorine main 7 exceeds the set upper and lower limits, the DCS automatic control system 6 automatically calculates and controls the opening of the first pneumatic bellows regulating valve 3 and the second pneumatic bellows regulating valve 5 according to the deviation value, thereby controlling the chlorine flow rate to offset the pressure that exceeds the set value.

[0046] Furthermore, the first pneumatic bellows regulating valve 3 and the second pneumatic bellows regulating valve 5 can realize automatic regulation and control of the negative pressure value of the chlorine main pipe 7 by adjusting the chlorine flow rate, thereby ensuring the smooth operation of the electrolytic cell.

[0047] Furthermore, the output end of the chlorine main pipe 7 is connected to the input end of the chlorine distribution table 8, the output end of the chlorine distribution table 8 is connected to the input end of the chlorine compressor 9, the output end of the chlorine compressor 9 is connected to the input end of the defoamer 10, and the output end of the defoamer 10 is connected to the input end of the chlorination process 11.

[0048] Furthermore, a manual bellows-sealed stop valve 2 is installed on the pipeline between the chlorine gas distribution station 8 and the chlorine compressor 9 .

[0049] Furthermore, the DCS automatic control system 6 further includes an automatic adjustment module and an alarm module. The automatic adjustment module is used to calculate and control the opening sizes of the first pneumatic bellows regulating valve 3 and the second pneumatic bellows regulating valve 5 through a preset algorithm according to the pressure value of the chlorine main pipe 7 monitored in real time by the pressure transmitter 1, so as to achieve precise control of the negative pressure value of the chlorine main pipe 7; the alarm module is used to send an alarm signal to remind the operator to take corresponding measures when the pressure transmitter 1 monitors that the pressure value of the chlorine main pipe 7 exceeds a preset safety range.

[0050] Further, a sedimentation tank 121 is provided at the bottom of the middle section of the outlet branch pipe 12, a slope 122 is installed on one side of the upper opening of the sedimentation tank 121, a filter screen 13 is installed on the outside of one side of the sedimentation tank 121, a rotating shaft 123 is installed horizontally inside the sedimentation tank 121, a spiral pusher 124 is installed on the rotating shaft 123, and a discharge port 125 is provided at the bottom of one side of the sedimentation tank 121, and the rotating shaft 123 is driven to rotate by a motor 126. By setting the sedimentation tank 121, the system can effectively capture and deposit impurity particles carried in the chlorine, such as dust, particulate matter, etc. This helps to purify the chlorine, improve its quality, and reduce the burden of subsequent processing procedures. The discharge port 125 provided at the bottom of the sedimentation tank 121 is convenient for discharging the deposited impurities regularly or as needed, keeping the sedimentation tank clean and effective, and ensuring the continuous and stable operation of the system. The installation of the filter screen 13 further enhances the impurity separation effect, which can prevent finer impurities from entering the chlorine main pipe and improve the purity of the chlorine. The motor 126 drives the rotating shaft 123 to rotate, driving the spiral pusher 124 to move in the sedimentation tank, realizing the automatic collection and pushing of impurities to the impurity discharge port, reducing the frequency and labor intensity of manual cleaning. The design of the slope 122 helps to guide the impurities in the chlorine gas to enter the sedimentation tank smoothly, while reducing the resistance in the flow of chlorine gas, optimizing the flow field distribution, and improving the overall efficiency of the system.

[0051] Further, the method for controlling the negative pressure of the chlorine main pipe 7 by adjusting the chlorine flow rate returned to the chlorine distribution station 8 is as follows:

[0052] S1. Install a manual regulating valve 4 and a second pneumatic bellows regulating valve 5 on the outlet branch pipe 12 at the rear end of the defoamer 10, and connect the other end of the outlet branch pipe 12 to the chlorine gas distribution table 8 in front of the chlorine compressor 9;

[0053] S2. Install a pressure transmitter 1 on the chlorine main pipe 7 to monitor the pressure of the chlorine main pipe in real time;

[0054] S3, interlocking control of the pressure transmitter 1, the second pneumatic bellows regulating valve 5 and the DCS automatic control system 6;

[0055] S4, setting the upper and lower limit control values ​​of the chlorine main pipe pressure in the DCS automatic control system 6;

[0056] S5. When the pressure transmitter 1 detects that the pressure of the chlorine main pipe exceeds the upper and lower limits set by the DCS automatic control system 6, the DCS automatic control system 6 automatically calculates and controls the opening size of the second pneumatic bellows regulating valve 5 according to the size of the deviation value, thereby adjusting the chlorine flow rate returning to the chlorine distribution station 8 to offset the pressure part that exceeds the set value, thereby realizing automatic, timely and accurate control of the negative pressure value of the chlorine main pipe of the electrolytic cell.

[0057] Further, the method for controlling the negative pressure of the chlorine main pipe 7 by adjusting the chlorine flow rate at the outlet of the chlorine compressor 9 back to the inlet of the chlorine compressor 9 is as follows:

[0058] T1, installing a first pneumatic bellows regulating valve 3 on the chlorine gas circulation pipeline inside the chlorine compressor 9;

[0059] T2, interlocking control of the pressure transmitter 1, the first pneumatic bellows regulating valve 3 and the DCS automatic control system 6;

[0060] T3, setting the upper and lower limit control values ​​of the chlorine main pipe 7 pressure in the DCS automatic control system 6;

[0061] T4. When the pressure transmitter 1 detects that the pressure of the chlorine main pipe exceeds the upper and lower limits of the DCS automatic control system 6, the DCS automatic control system 6 automatically calculates and controls the opening size of the first pneumatic bellows regulating valve 3 according to the size of the deviation value, thereby adjusting the chlorine flow rate at the outlet of the chlorine compressor 9 back to the inlet of the chlorine compressor 9 to offset the pressure part that exceeds the set value, thereby realizing automatic, timely and accurate control of the negative pressure value of the chlorine main pipe of the electrolytic cell.

[0062] By installing a regulating valve on the outlet branch pipe at the rear end of the defoamer and connecting it to the chlorine distribution table, combined with the pressure transmitter and DCS automatic control system, the negative pressure of the chlorine main pipe can be accurately controlled. When the main pipe pressure exceeds the set range, the system can automatically adjust the chlorine flow rate returned to the chlorine distribution table to ensure that the negative pressure value is stable within the preset range. By adjusting the chlorine flow rate at the outlet of the chlorine compressor back to its inlet, the chlorine circulation process is further optimized. This method not only helps to maintain a stable negative pressure in the chlorine main pipe, but also improves the overall treatment efficiency of chlorine and the response speed of the system. With the help of the DCS automatic control system, the negative pressure of the chlorine main pipe is automatically, timely and accurately controlled. This greatly reduces the need for manual intervention, improves the automation level of the system, and reduces the difficulty and labor intensity of operation. By real-time monitoring of the pressure of the chlorine main pipe and automatically adjusting the opening of the relevant valves according to the pressure changes, system failures or safety accidents caused by excessive or low pressure are effectively prevented. This significantly improves the stability and safety of the system. This technical method is not only applicable to the control of negative pressure in the main chlorine pipe of the electrolytic cell, but also provides new ideas and directions for the optimization of chlorine treatment process. By finely adjusting the flow and pressure of chlorine, the quality and treatment effect of chlorine can be further improved.

[0063] Finally, it should be noted that the electronic components of the DCS automatic control system 6, chlorine gas distribution station 8, etc. in this embodiment are all universal standard parts or parts known to those skilled in the art, and their structures and principles are known to 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 respectively, and the specific connection means should refer to the working sequence between the electrical components in the above-mentioned working principle to complete the electrical connection, which are all well-known technologies in the art.

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A system device for automatically controlling the pressure of the chlorine main pipe in magnesium electrolysis production, characterized in that: include Chlorine main pipe (7), chlorine distribution table (8), chlorine compressor (9), defoamer (10); A pressure transmitter (1), the pressure transmitter (1) being installed on the chlorine main pipe (7) and used for monitoring the pressure of the chlorine main pipe (7); A first pneumatic bellows regulating valve (3) and a second pneumatic bellows regulating valve (5), wherein the first pneumatic bellows regulating valve (3) is installed on a chlorine gas circulation pipeline inside a chlorine compressor (9), and the output end of the defoamer (10) is also connected via an outlet branch pipe (12), and the second pneumatic bellows regulating valve (5) is installed on the outlet branch pipe (12) and is used to adjust the flow rate of chlorine gas; A DCS automatic control system (6) is interlocked with a pressure transmitter (1), a pneumatic control valve (3) and a pneumatic bellows control valve (5) to automatically calculate and control the openings of the first pneumatic bellows control valve (3) and the second pneumatic bellows control valve (5) according to the pressure value of the chlorine main pipe monitored by the pressure transmitter (1), so as to realize automatic, timely and accurate control of the negative pressure value of the chlorine main pipe (7).

2. The system device for automatically controlling the pressure of the chlorine main pipe in magnesium electrolysis production according to claim 1, characterized in that: It also comprises a manual regulating valve (4), which is installed on the outlet branch pipe (12) at the rear end of the defoamer (10) and is in a normally open state, and is used to assist in regulating the flow rate of chlorine gas.

3. The system device for automatically controlling the pressure of the chlorine main pipe in magnesium electrolysis production according to claim 1, characterized in that: The DCS automatic control system (6) is provided with a chlorine main pipe pressure control module for controlling the upper and lower limits of the chlorine main pipe pressure. When the pressure transmitter (1) detects that the pressure of the chlorine main pipe (7) exceeds the set upper and lower limits, the DCS automatic control system (6) automatically calculates and controls the opening of the first pneumatic bellows regulating valve (3) and the second pneumatic bellows regulating valve (5) according to the deviation value, thereby controlling the chlorine flow to offset the pressure exceeding the set value.

4. The system device for automatically controlling the pressure of the chlorine main pipe in magnesium electrolysis production according to claim 1, characterized in that: The first pneumatic bellows regulating valve (3) and the second pneumatic bellows regulating valve (5) achieve automatic regulation and control of the negative pressure value of the chlorine main pipe (7) by regulating the chlorine flow rate, thereby ensuring the smooth operation of the electrolytic cell.

5. The system device for automatically controlling the pressure of the chlorine main pipe in magnesium electrolysis production according to claim 1, characterized in that: The output end of the chlorine main pipe (7) is connected to the input end of the chlorine distribution table (8), the output end of the chlorine distribution table (8) is connected to the input end of the chlorine compressor (9), the output end of the chlorine compressor (9) is connected to the input end of the defoamer (10), and the output end of the defoamer (10) is connected to the input end of the chlorination process (11).

6. The system device for automatically controlling the pressure of the chlorine main pipe in magnesium electrolysis production according to claim 5, characterized in that: A manual bellows-sealed stop valve (2) is installed on the pipeline between the chlorine gas distribution station (8) and the chlorine compressor (9).

7. The system device for automatically controlling the pressure of the chlorine main pipe in magnesium electrolysis production according to claim 5, characterized in that: The DCS automatic control system (6) further comprises an automatic adjustment module and an alarm module. The automatic adjustment module is used to calculate and control the opening sizes of the first pneumatic bellows regulating valve (3) and the second pneumatic bellows regulating valve (5) according to the pressure value of the chlorine main pipe (7) monitored in real time by the pressure transmitter (1) through a preset algorithm, so as to achieve accurate control of the negative pressure value of the chlorine main pipe (7); and the alarm module is used to send out an alarm signal to remind the operator to take corresponding measures when the pressure transmitter (1) monitors that the pressure value of the chlorine main pipe (7) exceeds a preset safety range.

8. The system device for automatically controlling the pressure of the chlorine main pipe in magnesium electrolysis production according to claim 1, characterized in that: A sedimentation trough (121) is provided at the bottom of the middle section of the lead-out branch pipe (12); a slope (122) is installed on one side of the upper opening of the sedimentation trough (121); a filter screen (13) is installed on the outside of one side of the sedimentation trough (121); a rotating shaft (123) is installed transversely inside the sedimentation trough (121); a spiral push piece (124) is installed on the rotating shaft (123); a debris discharge port (125) is provided at the bottom of one side of the sedimentation trough (121); and the rotating shaft (123) is driven to rotate by a motor (126).

9. The system device for automatically controlling the pressure of the chlorine main pipe in magnesium electrolysis production according to claim 1, characterized in that: The method for controlling the negative pressure of the chlorine main pipe (7) by adjusting the chlorine flow rate returning to the chlorine distribution station (8) is as follows: S1. Install a manual regulating valve (4) and a second pneumatic bellows regulating valve (5) on the outlet branch pipe (12) at the rear end of the defoamer (10), and connect the other end of the outlet branch pipe (12) to the chlorine gas distribution table (8) in front of the chlorine compressor (9); S2. Install a pressure transmitter (1) on the chlorine main pipe (7) to monitor the pressure of the chlorine main pipe in real time; S3, interlockingly controlling the pressure transmitter (1), the second pneumatic bellows regulating valve (5) and the DCS automatic control system (6); S4, setting the upper and lower limit control values ​​of the chlorine main pipe pressure in the DCS automatic control system (6); S5. When the pressure transmitter (1) detects that the pressure of the chlorine main pipe exceeds the upper and lower limits set by the DCS automatic control system (6), the DCS automatic control system (6) automatically calculates and controls the opening of the second pneumatic bellows regulating valve (5) according to the size of the deviation value, thereby adjusting the chlorine flow rate returning to the chlorine distribution station (8) to offset the pressure portion exceeding the set value, thereby achieving automatic, timely and accurate control of the negative pressure value of the chlorine main pipe of the electrolytic cell.

10. The system device for automatically controlling the pressure of the chlorine main pipe in magnesium electrolysis production according to claim 1, characterized in that: The method for controlling the negative pressure of the chlorine main pipe (7) by adjusting the chlorine flow rate at the outlet of the chlorine compressor (9) back to the inlet of the chlorine compressor (9) is as follows: T1, installing a first pneumatic bellows regulating valve (3) on the chlorine gas circulation pipeline inside the chlorine compressor (9); T2, interlockingly controlling the pressure transmitter (1), the first pneumatic bellows regulating valve (3) and the DCS automatic control system (6); T3, setting the upper and lower limit control values ​​of the pressure of the chlorine main pipe (7) in the DCS automatic control system (6); T4. When the pressure transmitter (1) detects that the pressure of the chlorine main pipe exceeds the upper and lower limits of the DCS automatic control system (6), the DCS automatic control system (6) automatically calculates and controls the opening of the first pneumatic bellows regulating valve (3) according to the size of the deviation value, thereby adjusting the chlorine flow rate at the outlet of the chlorine compressor (9) back to the inlet of the chlorine compressor (9) to offset the pressure portion exceeding the set value, thereby realizing automatic, timely and accurate control of the negative pressure value of the chlorine main pipe of the electrolytic cell.

Images