Argon recovery system and automatic control method for double membrane gas holder

Abstract

The application discloses an argon recovery system, relates to the technical field of double-membrane gas holder application, and comprises a double-membrane gas holder, a compressor, a catalytic system, a control system, a liquid level gauge, a first flowmeter, a second flowmeter and a circulation loop control valve which are electrically connected with the control system, the liquid level gauge is used for monitoring the height of the inner membrane of the double-membrane gas holder, the compressor is connected to the outlet of the double-membrane gas holder, the catalytic system is arranged on the pipeline at the outlet of the compressor, the first flowmeter is arranged on the pipeline between the double-membrane gas holder and the raw material gas inlet, the second flowmeter is arranged on the pipeline between the compressor and the gas total discharge outlet, the circulation loop is arranged in parallel with the compressor, and the circulation loop control valve is arranged on the circulation loop. The application further discloses a double-membrane gas holder automatic control method, which is used for the argon recovery system as described above. The application makes the equipment operation more stable, realizes higher degree of automation and reduces waste.

Description

Technical Field

[0001] This invention relates to the field of dual-membrane gas holder application technology, and in particular to an argon gas recovery system and an automatic control method for dual-membrane gas holders. Background Technology

[0002] Traditional gas holders, as key equipment for storing raw materials in industrial production, directly impact production efficiency and cost control through their operational stability and resource utilization. However, in actual operating conditions, when the inner membrane height abnormally rises or the system pressure exceeds the safety threshold, the current conventional approach is often to directly vent and depressurize. This crude operation not only causes serious waste of raw materials but also creates multiple hidden dangers for the long-term stable operation of the equipment. From the perspective of resource loss, the raw materials vented directly are often high-value gases that have undergone multiple processes such as purification and compression. Some of their components may be core raw materials in the production process, or even contain rare components. These gases are directly discharged into the atmosphere without effective recovery, leading to high raw material procurement costs, unnecessary waste of production resources, and potential environmental compliance risks due to the emission of harmful substances. Furthermore, the harm caused by direct venting is even more pronounced in terms of equipment operational stability. On the one hand, a sudden depressurization process can cause drastic changes in the stress state of the inner membrane of the gas holder. Frequent pressure spikes and drops can exacerbate fatigue wear on the inner membrane material, reduce its service life, and may even lead to serious equipment failures such as inner membrane tearing and seal failure. On the other hand, the high gas velocity and strong impact force during venting can cause impact damage to the gas holder's support structure, sealing devices, and other components, affecting the structural integrity of the equipment. Furthermore, direct venting can lead to excessive system pressure fluctuations, affecting the pressure balance of upstream and downstream production processes, triggering a chain reaction of abnormal equipment operation and product quality fluctuations. In severe cases, it may force the entire production line to shut down for maintenance, resulting in huge economic losses. Therefore, there is an urgent need for an argon recovery system and an automatic control method for dual-membrane gas holders to solve the above-mentioned technical problems. Summary of the Invention

[0003] The purpose of this invention is to provide an argon recovery system and an automatic control method for a dual-membrane gas holder, so as to solve the problems existing in the prior art, make the equipment operate more smoothly, achieve a higher degree of automation, and reduce waste.

[0004] To achieve the above objectives, the present invention provides the following solution: This invention provides an argon recovery system, including a dual-membrane gas holder, a compressor, a catalytic system, a control system, a liquid level gauge, a first flow meter, a second flow meter, and a circulation loop control valve. The liquid level gauge monitors the height of the inner membrane of the dual-membrane gas holder. The compressor is connected to the outlet of the dual-membrane gas holder. The catalytic system is located on the pipeline at the compressor outlet. The first flow meter is located on the pipeline between the dual-membrane gas holder and the raw material gas inlet. The second flow meter is located on the pipeline between the compressor and the gas outlet. The circulation loop is connected in parallel with the compressor, and the circulation loop control valve is located on the circulation loop. The liquid level gauge, the first flow meter, the second flow meter, and the circulation loop control valve are all electrically connected to the control system. When the reading of the liquid level gauge is greater than a set value, the control system outputs an electrical signal to control the circulation loop control valve to close slightly. When the reading of the liquid level gauge is less than the set value, the control system outputs an electrical signal to control the circulation loop control valve to open wider. When the difference between the two flow meters is greater than a set difference, the control system outputs an electrical signal to control the circulation loop control valve to close slightly.

[0005] In some embodiments, a first high-level venting line is also included, which is disposed between the first flow meter and the dual-membrane gas holder, and a first control valve is provided on the first high-level venting line.

[0006] In some embodiments, a second control valve is also included, which is disposed on the pipeline between the first high-level venting pipeline and the dual-membrane gas holder.

[0007] In some embodiments, a second high-level venting line and a third high-level venting line are also included. The second high-level venting line is connected inside the dual-membrane gas holder and is located near the inlet of the dual-membrane gas holder. The third high-level venting line is connected inside the dual-membrane gas holder and is located near the outlet of the dual-membrane gas holder.

[0008] In some embodiments, a first pressure indicator and a second pressure indicator are also included, wherein the first pressure indicator is used to monitor the pressure inside the inner membrane of the dual-membrane gas holder, and the second pressure indicator is used to monitor the pressure between the inner and outer membranes of the dual-membrane gas holder.

[0009] In some embodiments, a first pressure transmitter and a second pressure transmitter are also included. The first pressure transmitter is used to monitor the pressure inside the inner membrane of the dual-membrane gas holder and transmit an electrical signal to the control system. The second pressure transmitter is used to monitor the pressure between the inner and outer membranes of the dual-membrane gas holder and transmit an electrical signal to the control system.

[0010] In some embodiments, a cooling system is also included, which uses cooling circulating water to cool the return gas in the circulation loop.

[0011] The present invention also provides an automatic control method for a dual-membrane gas holder, for use in the argon recovery system described above, comprising the following steps: S1: Set the inner membrane running height of the dual-membrane gas holder to 4.5m-7.5m, set the preset value of the difference between the first flow meter and the second flow meter, and set an alarm device to alarm when the inner membrane running height is less than 4.2m or greater than 7.8m; S2: When the difference between the two flow meters is greater than the preset value, the control system outputs an electrical signal to control the control valve of the circulation loop to reduce the fixed opening degree, and checks the difference between the two flow meters again at regular intervals. When the difference begins to decrease, the opening degree is stopped. If the difference between the two flow meters increases, the fixed opening degree is reduced until the difference between the two flow meters is less than the preset value. S3: When the inner membrane running height is less than or equal to 4.5m, the control system outputs an electrical signal to control the circulation loop control valve to increase the fixed opening degree, and checks the inner membrane height again at regular intervals. If the height increases, the opening degree is stopped; if the height decreases, the fixed opening degree is continued to increase. When the height exceeds 6m, the opening degree is stopped. S4: When the inner membrane running height is greater than or equal to 7.5m, the control system outputs an electrical signal to control the circulation loop control valve to reduce the fixed opening degree, and checks the inner membrane height again at regular intervals. If the height decreases, the opening degree is stopped from increasing; if the height increases, the fixed opening degree is continued to increase. When the height is lower than 5.5m, the opening degree is stopped from decreasing. S5: When the inner membrane operates at a height greater than 8m, the high-level venting pipeline before the inlet of the double membrane gas holder is vented to stop gas from entering the double membrane gas holder.

[0012] In some implementations, when the inner membrane operates at a height greater than 8.5m, the high-level venting pipeline inside the double-membrane gas holder and the high-level venting pipeline before the inlet of the double-membrane gas holder are all vented, and venting stops when the height is less than or equal to 5m.

[0013] In some implementations, the fixed opening degree of the control valve in each cycle is 0.5%.

[0014] The present invention achieves the following technical effects compared to the prior art: The argon recovery system provided by this invention utilizes a dual-membrane gas holder to buffer argon, with a liquid level gauge monitoring the inner membrane height in real time. Combined with a control system that adjusts the circulation loop control valve, this prevents excessive argon overflow or insufficient argon from causing a supply interruption. Simultaneously, the first and second flow meters monitor the gas flow rates at the inlet and outlet. When the difference exceeds a set value, the control valve closes, reducing unnecessary argon loss during transmission and processing, significantly improving the argon recovery rate and reducing waste from direct argon venting in industrial production, thereby lowering the cost of purchasing new argon for enterprises. Furthermore, the parallel design of the circulation loop and compressor allows argon that does not meet emission or reuse standards to re-enter the circulation process, further improving argon utilization. The dual-membrane gas holder itself has the characteristic of stabilizing internal pressure. The inner membrane stores argon, and the interlayer between the outer and inner membranes allows for pressure adjustment. Combined with the monitoring of the liquid level gauge and the adjustment of the control valve, the argon pressure and storage capacity within the gas holder remain within a stable range. During subsequent compressor and catalytic system processing, the intake air volume and pressure remain stable, avoiding problems such as sudden changes in compressor load and incomplete catalytic reaction caused by air volume fluctuations, resulting in more stable operation. The liquid level gauge, two flow meters, and circulation loop control valves are all linked to the control system's electrical signals, eliminating the need for frequent manual monitoring of the gas tank level and gas flow, as well as manual valve adjustment. The control system automatically issues commands to close or open valves based on preset standards, achieving unattended automated operation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the connection of the argon recovery system in some embodiments of the present invention.

[0017] In the diagram: 1-First flow meter; 2-Second flow meter; 3-Dual diaphragm gas holder; 4-Liquid level gauge; 5-Circulation loop control valve; 6-Compressor; 7-First high-level vent line; 8-First control valve; 9-Second control valve; 10-Second high-level vent line; 11-Third high-level vent line; 12-First pressure transmitter; 13-First pressure indicator; 14-Second pressure transmitter; 15-Second pressure indicator; 16-Cooling system. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] The purpose of this invention is to provide an argon recovery system and an automatic control method for a dual-membrane gas holder, so as to solve the problems existing in the prior art, make the equipment operate more smoothly, achieve a higher degree of automation, and reduce waste.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Example 1 like Figure 1 As shown, this invention provides an argon recovery system, including a dual-membrane gas holder 3, a compressor 6, a catalytic system, a control system, a liquid level gauge 4, a first flow meter 1, a second flow meter 2, and a circulation loop control valve 5. The liquid level gauge 4 is used to monitor the height of the inner membrane of the dual-membrane gas holder 3. The compressor 6 is connected to the outlet of the dual-membrane gas holder 3. The catalytic system is installed on the pipeline at the outlet of the compressor 6. The first flow meter 1 is installed on the pipeline between the dual-membrane gas holder 3 and the raw material gas inlet. The second flow meter 2 is installed on the pipeline between the compressor 6 and the gas outlet. The circulation loop is connected in parallel with the compressor 6, and the circulation loop control valve 5 is installed on the circulation loop. The liquid level gauge 4, the first flow meter 1, the second flow meter 2, and the circulation loop control valve 5 are all electrically connected to the control system. When the reading of the liquid level gauge 4 is greater than the set value, the control system outputs an electrical signal to control the circulation loop control valve 5 to close slightly. When the reading of the liquid level gauge 4 is less than the set value, the control system outputs an electrical signal to control the circulation loop control valve 5 to open wider. When the difference between the two flow meters is greater than the set difference, the control system outputs an electrical signal to control the circulation loop control valve 5 to close slightly.

[0022] By using a dual-membrane gas holder 3 to buffer argon gas, and a liquid level gauge 4 to monitor the inner membrane height in real time, along with the control system adjusting the circulation loop control valve 5, the system can prevent excessive argon overflow or insufficient argon from causing a supply interruption. Simultaneously, the first flow meter 1 and the second flow meter 2 monitor the gas flow at the inlet and outlet. When the difference exceeds a set value, the control valve closes, reducing unnecessary argon loss during transmission and processing, significantly improving the argon recovery rate, reducing waste from direct argon venting in industrial production, and thus lowering the cost of purchasing new argon for enterprises. Furthermore, the parallel design of the circulation loop and compressor 6 allows argon that does not meet emission or reuse standards to re-enter the circulation process, further improving argon utilization. The dual-membrane gas holder 3 itself has the characteristic of stabilizing internal pressure. The inner membrane stores argon gas, and the interlayer between the outer and inner membranes allows for pressure adjustment. Combined with the monitoring of the liquid level gauge 4 and the adjustment of the control valve, the argon pressure and storage capacity within the gas holder remain within a stable range. During subsequent processing by compressor 6 and the catalytic system, the intake volume and pressure remain stable, avoiding problems such as sudden load changes in compressor 6 and incomplete catalytic reaction caused by fluctuations in gas volume, resulting in more stable operation. The liquid level gauge 4, the two flow meters, and the circulation loop control valve 5 are all electrically linked to the control system, eliminating the need for frequent manual monitoring of the gas tank level and gas flow, as well as manual valve adjustment. The control system automatically issues commands to close or open the valves according to preset standards, achieving unattended automated operation.

[0023] In some embodiments, the argon recovery system further includes a first high-level venting pipeline 7, which is located between the first flow meter 1 and the double-membrane gas holder 3. A first control valve 8 is installed on the first high-level venting pipeline 7. The first control valve 8 can be manually operated or electrically controlled via connection to a control system. Under normal operating conditions, the first high-level venting pipeline 7 is normally closed. When the inner membrane height of the double-membrane gas holder 3 is too high, the circulation loop control valve 5 alone may not be able to achieve rapid regulation. Prolonged exposure of the inner membrane to excessive height may cause damage. By opening the first high-level venting pipeline 7 through the first control valve 8, gas is vented before reaching the double-membrane gas holder 3, rapidly reducing the intake volume from the source. This avoids risks such as stretching damage and sealing failure of the inner membrane due to prolonged overpressure and overcapacity, while also protecting the outer membrane interlayer pressure balance system of the double-membrane gas holder 3 and preventing damage to the overall structure of the gas holder. Compared to ordinary venting pipelines, high-level venting design can guide the vented gas to high altitudes for discharge, avoiding safety hazards caused by low-altitude accumulation (such as the risk of oxygen deficiency due to argon leakage, and potential safety issues after mixing with air).

[0024] In some embodiments, the argon recovery system further includes a second control valve 9, which is located on the pipeline between the first high-level vent line 7 and the dual-membrane gas holder 3. When pressure relief is required through the first high-level vent line 7, the second control valve 9 can be closed and the first control valve 8 can be opened to ensure that excess raw material gas is completely vented from the high level, preventing some gas from still flowing into the gas holder and causing incomplete pressure relief, and ensuring that the inner membrane height quickly returns to a safe range. When the system is recovering normally and venting is not required, the first control valve 8 can be closed and the second control valve 9 can be opened to ensure that all raw material gas enters the dual-membrane gas holder 3, preventing gas leakage from the vent line and waste, and preventing air backflow into the gas holder from affecting the purity of argon, making safety protection more precise and argon recovery more efficient.

[0025] In some embodiments, the argon recovery system further includes a second high-level vent pipe 10 and a third high-level vent pipe 11. The second high-level vent pipe 10 is connected inside the double-membrane gas holder 3 and is located near the inlet of the double-membrane gas holder 3. The third high-level vent pipe 11 is connected inside the double-membrane gas holder 3 and is located near the outlet of the double-membrane gas holder 3. The second high-level vent pipe 10 (near the inlet) can quickly release excess raw material gas that has just entered the gas holder, avoiding a sudden increase in local pressure at the inlet end that could cause excessive stretching of the inner membrane at the inlet side. The third high-level vent pipe 11 (near the outlet) can release the argon gas that has been buffered inside the gas holder, preventing the gas holder from becoming overpressured due to untimely regulation by the subsequent compressor 6 and circulation loop at the outlet end. This is especially suitable for scenarios with large gas holder volumes and lag in gas flow. Together with the existing first high-level venting pipeline 7 (front-end interception), it forms a triple safety protection system of front-end interception and regional depressurization in the gas holder, reducing the risk of damage to the inner membrane of the gas holder caused by local overpressure and overall overcapacity. At the same time, the high-level emission design avoids the accumulation of argon gas at low altitudes, ensuring the safety of the production environment.

[0026] In some embodiments, the argon recovery system further includes a first pressure indicator 13 and a second pressure indicator 15. The first pressure indicator 13 monitors the pressure within the inner membrane of the dual-membrane gas holder 3, and the second pressure indicator 15 monitors the pressure between the inner and outer membranes of the dual-membrane gas holder 3. The first pressure indicator 13 provides real-time feedback on the actual pressure of the argon gas inside the gas holder, providing accurate pressure data support for the control system to adjust the circulation loop control valve 5 and the high-level venting pipeline, avoiding misjudgments in regulation caused by mismatch between liquid level and pressure (such as pressure deviation caused by changes in gas temperature). The second pressure indicator 15 monitors the interlayer pressure between the inner and outer membranes (the core balance pressure of the dual-membrane gas holder 3), ensuring that the interlayer pressure is always maintained within the design range, guaranteeing the normal expansion and sealing performance of the inner membrane, and preventing the inner membrane from shifting, wrinkling, or breaking due to excessively high or low interlayer pressure. The dual pressure data is presented intuitively, allowing operators to quickly grasp the operating status of the gas holder, providing a clear basis for manual intervention and parameter optimization, and improving the convenience of system operation and maintenance.

[0027] In some embodiments, the argon recovery system further includes a first pressure transmitter 12 and a second pressure transmitter 14. The first pressure transmitter 12 monitors the pressure inside the inner membrane of the dual-membrane gas holder 3 and transmits an electrical signal to the control system. The second pressure transmitter 14 monitors the pressure between the inner and outer membranes of the dual-membrane gas holder 3 and transmits an electrical signal to the control system. The first pressure transmitter 12 provides real-time feedback on the argon pressure inside the inner membrane. The control system can combine data from the liquid level gauge 4 and the flow meter to accurately determine the pressure change trend (such as a sudden increase in pressure due to temperature rise or pressure fluctuations caused by fluctuations in the intake volume), and automatically trigger actions such as opening the high-level venting pipeline and adjusting the circulation loop control valve 5, avoiding delays or misjudgments due to manual intervention, making pressure control more precise and responsive. The second pressure transmitter 14 uploads the inter-membrane balance pressure data in real time. If the inter-membrane pressure is lower or higher than a set threshold, the control system can automatically activate the inter-membrane pressure replenishment or depressurization device (if configured) to quickly restore the inter-membrane pressure balance, ensuring that the inner membrane is always in a stable support state and avoiding fluctuations in intake and exhaust flow caused by inter-membrane pressure imbalance. Compared to indirect control that relies solely on liquid level height, the direct pressure data provided by pressure transmitters makes the control logic of the control system more scientific, adaptable to complex operating conditions such as changes in gas temperature and composition, and ensures that the system operating parameters are always within the optimal range.

[0028] In some embodiments, the argon recovery system further includes a cooling system 16, which uses circulating cooling water to cool the return gas in the circulation loop. During the pressurization process of the compressor 6, the argon gas generates a large amount of heat due to adiabatic compression, causing the gas temperature to rise sharply. This cooling system is configured to cool the high-temperature gas before it enters the compressor inlet during compressor return. The high-temperature gas discharged from the compressor outlet directly enters the catalytic system, which can directly utilize the heat from the compressor exhaust, reducing the heater power.

[0029] Example 2 This embodiment also provides an automatic control method for a dual-membrane gas holder, specifically for the argon recovery system in Embodiment 1, comprising the following steps: S1: Set the inner membrane running height of the dual-membrane gas holder 3 to 4.5m-7.5m, set the preset value of the difference between the first flow meter 1 and the second flow meter 2, and set an alarm device to alarm when the inner membrane running height is less than 4.2m or greater than 7.8m; S2: When the difference between the two flow meters is greater than the preset value, the control system outputs an electrical signal to control the circulation loop control valve 5 to reduce the fixed opening degree, and checks the difference between the two flow meters again at regular intervals. When the difference begins to decrease, the opening degree is stopped. If the difference between the two flow meters increases, the fixed opening degree is reduced until the difference between the two flow meters is less than the preset value. S3: When the inner membrane running height is less than or equal to 4.5m, the control system outputs an electrical signal to control the circulation loop control valve 5 to increase the fixed opening degree, and checks the inner membrane height again at regular intervals. If the height increases, the opening degree is stopped; if the height decreases, the fixed opening degree is continued to increase. When the height exceeds 6m, the opening degree is stopped.

[0030] S4: When the inner membrane running height is greater than or equal to 7.5m, the control system outputs an electrical signal to control the circulation loop control valve 5 to reduce the fixed opening degree, and checks the inner membrane height again at regular intervals. If the height decreases, the opening degree is stopped from increasing; if the height increases, the fixed opening degree is continued to increase. When the height is lower than 5.5m, the opening degree is stopped from decreasing.

[0031] S5: When the inner membrane runs at a height greater than 8m, the high-level venting pipeline before the inlet of the double membrane gas holder 3 is vented to stop gas from entering the double membrane gas holder 3.

[0032] The circulating loop control valve 5 employs a closed-loop logic of fixed opening adjustment combined with interval re-inspection: after adjustment, the system monitors changes in height and flow rate difference in real time to determine the control effect and decide whether to continue operation. This avoids sudden changes in operating conditions (such as sudden pressure rises and falls) caused by excessive single adjustment, and also prevents continuous deviation from the optimal operating range due to insufficient adjustment, ensuring the system smoothly returns to the optimal operating range. Refined flow rate and height linkage control: the control valve is only closed slightly when the flow rate difference exceeds the preset value (meaning excessive argon loss), avoiding blind venting; when the inner membrane height does not reach the extreme threshold, the circulating loop is used for adjustment instead of venting, maximizing the retention of argon in the gas holder. High-level venting at the front end is only initiated at extremely high levels (≥8m). Compared to the design of venting immediately upon exceeding the warning level, this significantly reduces argon emissions under normal fluctuating operating conditions, improves recovery rate, and reduces enterprise procurement costs.

[0033] In some embodiments, when the inner membrane operating height is greater than 8.5m, all high-level venting lines inside the dual-membrane gas holder 3 and before the inlet of the dual-membrane gas holder 3 are vented. Venting stops when the height is less than or equal to 5m. The high-level venting line before the inlet (first high-level venting line 7) cuts off the entry of raw material gas from the source, preventing excessive gas from continuously flowing into the gas holder and preventing the inner membrane height from rising further. The high-level venting lines inside the gas holder (second high-level venting line 10 and third high-level venting line 11) directly release the excess argon gas already buffered in the gas holder, accelerating the drop in inner membrane height and preventing irreversible damage such as tensile failure and weld cracking caused by prolonged overcapacity and overpressure. The synergistic effect of dual venting, compared to a single venting line, can reduce the pressure and liquid level of the gas holder to a safe range in a short time, preventing equipment scrapping or safety accidents caused by extreme overpressure.

[0034] In some embodiments, the fixed opening degree of the control valve 5 in each cycle is adjusted by 0.5%. This 0.5% micro-fixed opening degree adjustment is a fine-tuning mode, which can avoid sudden changes in system parameters caused by a single large adjustment. When the inner membrane height deviates from the normal range or the flow difference exceeds the preset value, the micro-opening adjustment allows the pressure, liquid level, and pipeline flow in the gas holder to change slowly, avoiding problems such as sudden pressure rises or falls and inner membrane height rebound caused by excessive adjustment. Combined with the control logic of interval re-inspection, the optimal operating state can be gradually approached through multiple small adjustments, ensuring that the system is always in a stable transition condition, which is especially suitable for industries with high requirements for gas flow and pressure stability. Even if a misadjustment occurs with a 0.5% micro-opening adjustment, the impact on the system operating condition is minimal, and it can be quickly corrected in the next re-inspection adjustment, avoiding chain problems such as argon waste and pressure imbalance caused by misadjustment, and improving the fault tolerance rate.

[0035] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An argon gas recovery system, characterized in that: The system includes a dual-membrane gas holder, a compressor, a catalytic system, a control system, a liquid level gauge, a first flow meter, a second flow meter, and a circulation loop control valve. The liquid level gauge monitors the height of the inner membrane of the dual-membrane gas holder. The compressor is connected to the outlet of the dual-membrane gas holder. The catalytic system is located on the pipeline at the compressor outlet. The first flow meter is located on the pipeline between the dual-membrane gas holder and the feed gas inlet. The second flow meter is located on the pipeline between the compressor and the total gas outlet. The circulation loop is connected in parallel with the compressor, and the circulation loop control valve is located on the circulation loop. The liquid level gauge, the first flow meter, the second flow meter, and the circulation loop control valve are all electrically connected to the control system. When the reading of the liquid level gauge is greater than a set value, the control system outputs an electrical signal to control the circulation loop control valve to close slightly. When the reading of the liquid level gauge is less than the set value, the control system outputs an electrical signal to control the circulation loop control valve to open wider. When the difference between the two flow meters is greater than a set difference, the control system outputs an electrical signal to control the circulation loop control valve to close slightly.

2. The argon recovery system according to claim 1, characterized in that: It also includes a first high-level venting pipeline, which is located between the first flow meter and the dual-membrane gas holder, and a first control valve is installed on the first high-level venting pipeline.

3. The argon recovery system according to claim 2, characterized in that: It also includes a second control valve, which is located on the pipeline between the first high-level venting pipeline and the dual-membrane gas holder.

4. The argon recovery system according to claim 1, characterized in that: It also includes a second high-level venting line and a third high-level venting line. The second high-level venting line is connected inside the double-membrane gas holder and is located near the inlet of the double-membrane gas holder. The third high-level venting line is connected inside the double-membrane gas holder and is located near the outlet of the double-membrane gas holder.

5. The argon recovery system according to claim 1, characterized in that: It also includes a first pressure indicator and a second pressure indicator. The first pressure indicator is used to monitor the pressure inside the inner membrane of the dual-membrane gas holder, and the second pressure indicator is used to monitor the pressure between the inner and outer membranes of the dual-membrane gas holder.

6. The argon recovery system according to claim 1, characterized in that: It also includes a first pressure transmitter and a second pressure transmitter. The first pressure transmitter is used to monitor the pressure inside the inner membrane of the dual-membrane gas holder and transmit an electrical signal to the control system. The second pressure transmitter is used to monitor the pressure between the inner and outer membranes of the dual-membrane gas holder and transmit an electrical signal to the control system.

7. The argon recovery system according to claim 1, characterized in that: It also includes a cooling system that uses circulating cooling water to cool the return gas in the circulation loop.

8. An automatic control method for a dual-membrane gas holder, characterized in that: The process for the argon recovery system as described in any one of claims 1-7 includes the following steps: S1: Set the inner membrane running height of the dual-membrane gas holder to 4.5m-7.5m, set the preset value of the difference between the first flow meter and the second flow meter, and set an alarm device to alarm when the inner membrane running height is less than 4.2m or greater than 7.8m; S2: When the difference between the two flow meters is greater than the preset value, the control system outputs an electrical signal to control the control valve of the circulation loop to reduce the fixed opening degree, and checks the difference between the two flow meters again at regular intervals. When the difference begins to decrease, the opening degree is stopped. If the difference between the two flow meters increases, the fixed opening degree is reduced until the difference between the two flow meters is less than the preset value. S3: When the inner membrane running height is less than or equal to 4.5m, the control system outputs an electrical signal to control the circulation loop control valve to increase the fixed opening degree, and checks the inner membrane height again at regular intervals. If the height increases, the opening degree is stopped; if the height decreases, the fixed opening degree is continued to increase. When the height exceeds 6m, the opening degree is stopped. S4: When the inner membrane running height is greater than or equal to 7.5m, the control system outputs an electrical signal to control the circulation loop control valve to reduce the fixed opening degree, and checks the inner membrane height again at regular intervals. If the height decreases, the opening degree is stopped from increasing; if the height increases, the fixed opening degree is continued to increase. When the height is lower than 5.5m, the opening degree is stopped from decreasing. S5: When the inner membrane operates at a height greater than 8m, the high-level venting pipeline before the inlet of the double membrane gas holder is vented to stop gas from entering the double membrane gas holder.

9. The automatic control method for a dual-membrane gas holder according to claim 8, characterized in that: When the inner membrane operates at a height greater than 8.5m, all high-level venting pipelines inside the double-membrane gas holder and in front of the double-membrane gas holder inlet are vented. Venting stops when the height is less than or equal to 5m.

10. The automatic control method for a dual-membrane gas holder according to claim 8, characterized in that: The fixed opening degree of the control valve in each cycle is 0.5%.

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