System and method for preventing pressure build-up in a gas supply conduit

Abstract

This invention relates to the field of glass production technology, specifically to a system and method for preventing pressure buildup in a gas supply pipeline. The system includes: a pressure vessel containing a pre-set volume of liquid; a pressure sensor and a liquid level sensor mounted on the pressure vessel; and an atmospheric pressure vessel. A liquid inlet at the bottom of the pressure vessel is connected to the interior of the atmospheric pressure vessel via a first connecting pipe, and a drain outlet at the bottom of the atmospheric pressure vessel is connected to the liquid inlet at the bottom of the pressure vessel via a second connecting pipe. An automatic regulating valve is mounted on the first connecting pipe, and a liquid delivery pump is mounted on the second connecting pipe. This invention, through the combination of the pressure vessel and the atmospheric pressure vessel, and by placing a liquid in the pressure vessel, aims to reduce pressure fluctuations in the gas supply pipeline during reversal, thereby preventing overpressure venting.

Description

Technical Field

[0001] This invention relates to the field of glass production technology, and more specifically to a system and method for preventing pressure buildup in gas supply pipelines. Background Technology

[0002] Glass production is a continuous process, but the combustion system of glass melting furnaces has the characteristic of intermittent burner switching. During the switching, the gas supply is interrupted for about 30 seconds, and the normal gas supply pressure must be restored immediately after the switching. The switching cycle is about once every 20 minutes. Since glass production consumes a large amount of gas, when the downstream burner branch pipes are suddenly cut off at the same time, the pressure regulating valve group on the upstream main pipe cannot react quickly enough. This will cause the pipeline pressure between the downstream of the pressure regulating valve group and the shut-off valve to rise instantly. Sometimes, it may also cause the safety valve to open and release due to overpressure, or the emergency shut-off valve to automatically shut off due to overpressure. This will affect the normal production, safety management, and environmental protection of the enterprise.

[0003] To alleviate this problem, the traditional approach is to install a gas buffer tank on the pressurized section of the pipeline, giving the pressure regulating valve assembly more buffer time. However, the effect is not significant because the volume of the buffer tank is fixed. Before pressurization, the buffer tank is already filled with gas, and its buffering method only utilizes the pressure difference to accommodate some excess gas, reducing the pressure rise. Therefore, the smaller the allowable pressure difference, the larger the required volume needs to be. However, buffer tanks are flammable gas storage tanks and are hazard sources. A larger buffer tank volume increases the risk, which necessitates a limit to the buffer tank's volume. Therefore, the buffering effect of existing technology is not significant. Summary of the Invention

[0004] The purpose of this invention is to provide a system for preventing gas supply pipeline pressure buildup, thereby solving the above-mentioned technical problems;

[0005] The present invention also aims to provide a method for preventing gas supply pipeline pressure buildup, thereby solving the above-mentioned technical problems;

[0006] The technical problem solved by this invention can be achieved by the following technical solutions:

[0007] A system for preventing gas supply pipeline pressure buildup includes,

[0008] A pressure vessel is provided with a predetermined volume of liquid. The gas transmission port at the upper end of the pressure vessel is connected to the main gas supply pipeline of an external gas supply system. The pressure vessel is provided with a pressure sensor for detecting the pressure of the external gas supply system and a liquid level sensor for detecting the liquid level inside the pressure vessel.

[0009] An atmospheric pressure vessel, wherein the liquid transmission port at the bottom of the pressure vessel is connected to the interior of the atmospheric pressure vessel through a first connecting pipe, and the liquid discharge port at the bottom of the atmospheric pressure vessel is connected to the liquid transmission port at the bottom of the pressure vessel through a second connecting pipe, wherein an automatic regulating valve is provided on the first connecting pipe, and a liquid delivery pump is provided on the second connecting pipe;

[0010] An automation controller is connected to the pressure sensor, the liquid level sensor, the automatic regulating valve, and the liquid transfer pump. It receives the pressure signal output by the pressure sensor and the liquid level signal output by the liquid level sensor. Based on the pressure signal and the liquid level signal, the automation controller outputs a valve control signal to the automatic regulating valve and a pump control signal to the liquid transfer pump.

[0011] Preferably, the first connecting pipe extends from the top of the atmospheric pressure vessel to the bottom of the atmospheric pressure vessel.

[0012] Preferably, a flow regulating valve for controlling the liquid flow rate is provided on the first connecting pipe downstream of the automatic regulating valve.

[0013] Preferably, a one-way valve is provided on the second connecting pipe downstream of the liquid transfer pump.

[0014] Preferably, a safety valve is provided between the first connecting pipe and the second connecting pipe.

[0015] Preferably, the atmospheric pressure container has an overflow port at the top, a vent at the top, and a replenishment valve at the bottom, which is connected to an external replenishment pipeline.

[0016] Preferably, the liquid transfer port at the bottom of the pressure vessel is provided with a first maintenance shut-off valve, and the drain port at the bottom of the atmospheric pressure vessel is provided with a second maintenance shut-off valve.

[0017] Preferably, a separation device is provided at the interface between the gas and the liquid phase in the pressure vessel.

[0018] A method for preventing gas pipeline pressure buildup, used to implement the aforementioned system for preventing gas pipeline pressure buildup, comprising,

[0019] Step S1: When the external gas supply system is switched, the gas pressure in the pressure vessel rises. When the pressure of the external gas supply system is greater than or equal to a fourth pressure setting value, the automatic regulating valve opens, and the liquid phase in the pressure vessel flows into the atmospheric pressure vessel through the first connecting pipe.

[0020] Step S2: When the liquid level inside the pressure vessel is less than or equal to a first liquid level setting value or the pressure of the external gas supply system is less than or equal to a second pressure setting value, the automatic regulating valve is closed.

[0021] Step S3: When the pressure of the external gas supply system drops to less than or equal to a first pressure set value, the liquid transfer pump is turned on, and the liquid phase in the atmospheric pressure container is sent back to the pressure container through the second connecting pipe.

[0022] Step S4: Detect whether the pressure of the external air supply system rises again to a level greater than or equal to a third pressure setting value. If yes, proceed to step S5; otherwise, wait for the liquid level in the pressure vessel to rise to a level greater than or equal to a second liquid level setting value, complete one work cycle, and return to step S1 to execute the next work cycle.

[0023] Step S5: Turn off the liquid delivery pump and check whether the pressure of the external air supply system continues to rise. If the pressure of the external air supply system rises to a level greater than or equal to the fourth pressure setting value, open the automatic regulating valve and return to step S2. If the pressure of the external air supply system falls back to a level less than or equal to the first pressure setting value, the liquid delivery pump is restarted and step S3 continues.

[0024] Preferably, the first pressure setting value is greater than the pressure when the external gas supply system is working normally, the second pressure setting value is greater than the first pressure setting value, the third pressure setting value is greater than the second pressure setting value, and the fourth pressure setting value is greater than the second pressure setting value;

[0025] The second liquid level setting value is the highest liquid level value of the pressure vessel, and the first liquid level setting value is the lowest liquid level value of the pressure vessel.

[0026] The beneficial effects of the present invention are as follows: By adopting the above technical solution, the present invention achieves the purpose of reducing pressure fluctuations in the gas supply pipeline during reversal and avoiding overpressure venting by combining a pressure vessel and an atmospheric pressure vessel and setting a liquid phase in the pressure vessel. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the system for preventing gas supply pipeline pressure buildup according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the steps of a method for preventing gas supply pipeline pressure buildup according to an embodiment of the present invention.

[0029] In the attached diagram: 1. Pressure vessel; 2. Atmospheric pressure vessel; 3. Liquid transfer pump; 4. Check valve; 5. Safety valve; 6. Automatic control valve; 7. Flow regulating valve; 8. Pressure sensor; 9. Liquid level sensor; 10. First maintenance shut-off valve; 11. Second maintenance shut-off valve; 12. Replenishment valve; 13. Vent; 14. Overflow port; 15. Separation device; PLC, automation controller. Detailed Implementation

[0030] 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.

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0033] A system to prevent gas pipeline pressure buildup, such as Figure 1 As shown, including,

[0034] A pressure vessel 1 is provided with a pre-set volume of liquid. The gas transmission port at the upper end of the pressure vessel 1 is connected to the main gas supply pipeline of an external gas supply system. The pressure vessel 1 is provided with a pressure sensor 8 for detecting the external gas supply system and a liquid level sensor 9 for detecting the liquid level inside the pressure vessel 1.

[0035] An atmospheric pressure vessel 2 is provided. The liquid transmission port at the bottom of the pressure vessel 1 is connected to the interior of the atmospheric pressure vessel 2 through a first connecting pipe. The liquid discharge port at the bottom of the atmospheric pressure vessel 2 is connected to the liquid transmission port at the bottom of the pressure vessel 1 through a second connecting pipe. An automatic regulating valve 6 is provided on the first connecting pipe, and a liquid transfer pump 3 is provided on the second connecting pipe.

[0036] An automation controller PLC is connected to a pressure sensor 8, a liquid level sensor 9, an automatic regulating valve 6, and a liquid transfer pump 3. It receives the pressure signal output by the pressure sensor 8 and the liquid level signal output by the liquid level sensor 9. Based on the pressure signal and the liquid level signal, the automation controller PLC outputs a valve control signal to the automatic regulating valve 6 and a pump control signal to the liquid transfer pump 3.

[0037] Specifically, pressure vessel 1 is used to store excess gas in the gas pipeline during reversal, and releases the gas that causes pipeline pressure buildup into pressure vessel 1. Atmospheric pressure vessel 2 is used to store the liquid phase released from pressure vessel 1 during reversal, and the liquid phase in atmospheric pressure vessel 2 must be returned to pressure vessel 1 in a timely manner after reversal.

[0038] The first connecting pipe and the automatic regulating valve 6 are used to transfer the liquid phase material in the pressure vessel 1 to the atmospheric pressure vessel 2, and the second connecting pipe and the liquid transfer pump 3 are used to send the liquid phase material in the atmospheric pressure vessel 2 back to the atmospheric pressure vessel 2.

[0039] The opening and closing of the automatic regulating valve 6 is automatically controlled by the automatic controller PLC. The automatic regulating valve 6 opens automatically when the system starts to pressurize, releasing the liquid phase in the pressure vessel 1 into the atmospheric pressure vessel 2. The liquid transfer pump 3 is used to return the liquid phase in the atmospheric pressure vessel 2 to the pressure vessel 1 after the pressure buffering is completed.

[0040] Furthermore, before the reversal and pressurization, pressure vessel 1 is filled with liquid, while atmospheric pressure vessel 2 is empty. During the reversal, excess gas in the pipeline enters pressure vessel 1, and under the action of gas pressure, it forces the liquid in pressure vessel 1 into atmospheric pressure vessel 2, increasing the space in pressure vessel 1 used for gas storage. After the reversal, the pressure of the external gas supply system returns to normal, and at this time, liquid transfer pump 3 promptly pumps the liquid in atmospheric pressure vessel 2 back to pressure vessel 1, reducing the space in pressure vessel 1 used for gas storage.

[0041] Preferably, the present invention provides a pressure vessel 1 with variable gas phase space, and a complete set of equipment consisting of an atmospheric pressure vessel 2 and other facilities that are matched with the pressure vessel 1. The gas phase space of the pressure vessel 1 of the present invention can be automatically adjusted according to predetermined changes in conditions to achieve continuous automated control. The change in gas phase space will multiply its buffer capacity, greatly increase its ability to accept gas, and improve the volume utilization rate of the pressure vessel.

[0042] Furthermore, the present invention achieves changes in the volume of the gas phase space by adding a liquid phase substance into the pressure vessel and controlling the liquid level of the liquid phase substance. At the same time, the present invention is equipped with an automatic controller PLC to automatically control each component in the device according to the actual required expansion volume and the pressure fluctuation range that the device can withstand.

[0043] In a preferred embodiment, the first connecting pipe extends from the top of the atmospheric pressure vessel 2 to the bottom of the atmospheric pressure vessel 2;

[0044] Preferably, the first connecting pipe extends from the top of the atmospheric pressure vessel 2 to the bottom of the atmospheric pressure vessel 2, which is beneficial for adjusting the discharge flow rate when operating the flow regulating valve 7 and for preventing the liquid phase from splashing and evaporating inside the atmospheric pressure vessel 2.

[0045] In a preferred embodiment, a flow regulating valve 7 for controlling the liquid flow rate is provided on the first connecting pipe downstream of the automatic regulating valve 6; preferably, the flow regulating valve 7 can regulate the flow rate of the liquid phase discharged to the atmospheric pressure vessel 2, control the discharge speed, and keep the pressure of the pressure vessel 1 stable when the gas phase space changes.

[0046] In a preferred embodiment, a check valve 4 is provided on the second connecting pipe downstream of the liquid transfer pump 3.

[0047] Specifically, the one-way valve 4 is used to prevent the liquid in the pressure vessel 1 from flowing back uncontrollably into the atmospheric pressure vessel 2, ensuring the one-way flow of the liquid phase in the second connecting pipe.

[0048] In a preferred embodiment, a safety valve 5 is provided between the first connecting pipe and the second connecting pipe;

[0049] Specifically, safety valve 5 is used to automatically discharge the overpressurized liquid phase into atmospheric pressure container 2 when the system is overpressurized.

[0050] In a preferred embodiment, the atmospheric pressure container 2 is provided with an overflow port 14 at the top, a vent 13 at the top, and a replenishment valve 12 at the bottom, which is connected to an external replenishment pipeline.

[0051] Specifically, the overflow port 14 is used to overflow when the liquid in this device is excessive, the vent port 13 is used to maintain the atmospheric pressure container 2 at atmospheric pressure, and the replenishment valve 12 is normally closed when the device needs to be replenished with liquid.

[0052] In a preferred embodiment, the liquid transfer port at the bottom of the pressure vessel 1 is provided with a first maintenance shut-off valve 10, and the drain port at the bottom of the atmospheric pressure vessel 2 is provided with a second maintenance shut-off valve 11.

[0053] Specifically, the first maintenance shut-off valve 10 and the second maintenance shut-off valve 11 are normally open valves during normal operation of this device, and are manually closed when maintenance is required.

[0054] In a preferred embodiment, a separation device 15 is provided at the interface between the gas and liquid phase inside the pressure vessel 1.

[0055] Specifically, the separation device 15 can separate the gas and liquid phases and prevent them from seeping into each other. In this embodiment, the separation device 15 specifically adopts a floating plate.

[0056] It should be noted that the purpose of this invention is to solve problems encountered in glass industry production lines. Taking the gas supply system of a glass melting furnace that burns natural gas as a typical case, a solution is proposed. For glass melting furnaces that burn other gases, or for similar gas supply systems in non-glass industries, if similar gas supply pipeline pressure problems are encountered, the device of this invention can also be used to solve them, and should also fall within the protection scope of this invention.

[0057] A method for preventing gas supply pipeline pressure buildup, used to implement the gas supply pipeline pressure prevention system in any of the embodiments, such as... Figure 2 As shown, including,

[0058] Step S1: When the external gas supply system is switched, the gas pressure in the pressure vessel 1 rises. When the pressure of the external gas supply system is greater than or equal to a fourth pressure setting value, the automatic regulating valve 6 opens, and the liquid phase in the pressure vessel 1 flows into the atmospheric pressure vessel 2 through the first connecting pipe.

[0059] Step S2: When the liquid level inside the pressure vessel 1 is less than or equal to a first liquid level setting value or the pressure of the external air supply system is less than or equal to a second pressure setting value, the automatic regulating valve 6 is closed.

[0060] Step S3: When the pressure of the external gas supply system drops to less than or equal to a first pressure setting value, the liquid transfer pump 3 is turned on, and the liquid phase in the atmospheric pressure container 2 is sent back to the pressure container 1 through the second connecting pipe.

[0061] Step S4: Check if the pressure of the external air supply system rises again to a level greater than or equal to a third pressure setting value. If yes, proceed to step S5; otherwise, wait for the liquid level in pressure vessel 1 to rise to a level greater than or equal to a second liquid level setting value, complete one work cycle, and return to step S1 to execute the next work cycle.

[0062] Step S5: Turn off the liquid transfer pump 3 and check whether the pressure of the external air supply system continues to rise. If the pressure of the external air supply system rises to a level greater than or equal to the fourth pressure setting value, open the automatic regulating valve 6 and return to step S2. If the pressure of the external air supply system falls back to a level less than or equal to the first pressure setting value, the liquid transfer pump 3 is restarted and step S3 is continued.

[0063] In a preferred embodiment, the first pressure setting value is greater than the pressure when the external gas supply system is operating normally, the second pressure setting value is greater than the first pressure setting value, the third pressure setting value is greater than the second pressure setting value, and the fourth pressure setting value is greater than the second pressure setting value.

[0064] The second liquid level setting is the highest liquid level value of pressure vessel 1, and the first liquid level setting is the lowest liquid level value of pressure vessel 1.

[0065] Specifically, in this embodiment, a pressure sensor 8 is installed in the top gas phase space of the pressure vessel 1 to detect the pressure of the external gas supply system in real time. Simultaneously, the detected value PT is output to the automation controller PLC. The control program set within the automation controller PLC automatically controls the start and stop of the liquid transfer pump 3 and the opening and closing of the automatic regulating valve 6.

[0066] When PT ≥ fourth pressure set value P4, the automatic regulating valve 6 is opened;

[0067] When PT ≥ the third pressure setting value P3, the liquid transfer pump 3 is turned off;

[0068] When PT ≤ the second pressure setpoint P2, the automatic regulating valve 6 is closed;

[0069] When PT ≤ first pressure set value P1, start liquid transfer pump 3;

[0070] In this embodiment, the pressure of the external gas supply system during normal operation is set to P0. The relationship of the pressure setpoints is: P4 > P3 > P2 > P1 > P0.

[0071] Specifically, in this embodiment, a liquid level sensor 9 is provided on the side wall of the pressure vessel 1 to detect the liquid level inside the pressure vessel 1 in real time. Simultaneously, the detected value LT is output to the automation controller PLC. The control program set within the automation controller PLC automatically controls the start and stop of the liquid transfer pump 3 and the opening and closing of the automatic regulating valve 6.

[0072] When LT ≥ the second liquid level set value L2, the liquid transfer pump 3 is turned off;

[0073] When LT ≤ the first liquid level set value L1, the automatic regulating valve 6 is closed;

[0074] Where L2 > L1, specifically in this embodiment, L2 is the highest liquid level value when pressure vessel 1 is working normally, and L1 is the lowest liquid level value.

[0075] Specific Implementation Example 1,

[0076] This embodiment considers a typical large-scale glass melting furnace in China, with a natural gas consumption of approximately 9000 Nm³. 3 / h. The reversing time is estimated at 30 seconds. During the reversal, the closing reaction time of the pressure regulating valve assembly on the upstream main pipeline is estimated at 10 seconds. The gas flow rate during the pressure regulating valve closing process is estimated at 50% of the normal flow rate. Each reversal will generate approximately 12.5 Nm³ of gas. 3 Excess natural gas. Therefore, the task of pressure vessel 1 in this invention is to contain this excess 12.5 Nm. 3 Natural gas; the main gas pipeline supply pressure is calculated as P0 = 2.5 bar, then 12.5 Nm.3 The volume of natural gas at 2.5 bar is approximately 3.6 m³. 3 That is, the difference between the high and low liquid levels in pressure vessel 1 needs to be at least 3.6m. 3 The water volume. In engineering practice, the effective volume of pressure vessel 1 can be defined as 4m³. 3 Considering this, pressure vessel 1 can be adopted with a nominal volume of 6m³. 3 Pressure vessel 1, high liquid level L2 = 5m 3 Low liquid level L1 = 1m 3 Atmospheric pressure vessel 2 can also use the same 6m... 3 2. Atmospheric pressure vessel.

[0077] In this embodiment, the liquid phase in pressure vessel 1 is water. During the reversal, the 4m of water in pressure vessel 1... 3 The water needs to be discharged into atmospheric pressure vessel 2 within 30 seconds. Therefore, the diameter of the drain pipe from pressure vessel 1 to atmospheric pressure vessel 2 should not be less than DN200.

[0078] In this embodiment, the outlet pressure of the liquid transfer pump 3 must exceed 2.5 bar, and a maximum of 5 bar can be selected. The flow rate requirement is that it cannot be too small or too large; it must be controlled to be within 4 m³ / h. 3 The time it takes for water to be pumped from atmospheric pressure vessel 2 back to pressure vessel 1 is 10 to 15 minutes. Therefore, the key point in pump selection is that the flow rate should be controlled within the range of 16 to 24 m³ / s at an outlet pressure of 2.5 to 3 bar. 3 / h;

[0079] Based on the above-mentioned configuration and selection of main equipment and pipelines, the workflow of this embodiment is as follows:

[0080] When the external gas supply system is operating normally, the working pressure is 2.5 bar, i.e., P0 = 2.5 bar. Further, the fourth pressure setting value P4 = 2.7 bar, the third pressure setting value P3 = 2.65 bar, the second pressure setting value P2 = 2.6 bar, and the first pressure setting value P1 = 2.55 bar are set.

[0081] When the glass melting furnace is about to start reversing, the liquid level in pressure vessel 1 is LT = 5m. 3 The gas phase space pressure PT = 2.5 bar, and both the liquid transfer pump 3 and the automatic regulating valve 6 are in the closed state. When the reversal begins, the system pressure will rise rapidly. When it rises to PT ≥ 2.7 bar, the automatic regulating valve 6 opens, the buffering begins, and the liquid level in pressure vessel 1 will drop rapidly until LT ≤ 1 m. 3 At that time, the automatic regulating valve 6 closes, and the buffering is completed.

[0082] After buffering, the pressure PT will return to the normal 2.5 bar. The system is set to start the liquid transfer pump 3 when PT drops to PT≤2.55 bar, initiating the tank transfer process. Water is sent from container 2 back to pressure vessel 1. Since the filling process is relatively slow, the rise in liquid level will not affect the system pressure; at this time, the system pressure should be the normal 2.5 bar. When the liquid level in pressure vessel 1 rises to LT≥5m... 3 At this time, liquid transfer pump 3 shuts off, and the next cycle begins.

[0083] During the drop in liquid level in pressure vessel 1, PT may also drop accordingly. The PLC of the automation controller is set to close the automatic regulating valve 6 when PT ≤ 2.6 bar. After the automatic regulating valve 6 is closed, the PLC of the automation controller is set to start the liquid transfer pump 3 when PT continues to drop to PT ≤ 2.55 bar. Since the start of the liquid transfer pump 3 generally does not cause the system pressure to rise, in this case, LT does not need to drop to L1 to complete one working cycle.

[0084] During the rise of the liquid level in pressure vessel 1, PT may also rise. The automatic controller PLC is set to stop the liquid transfer pump 3 when PT ≥ 2.65 bar to prevent overpressure caused by the pump's operation. After the liquid transfer pump 3 stops, if PT continues to rise, the automatic regulating valve 6 will open when PT ≥ 2.7 bar, and the buffer will restart. If PT stops rising, it will decrease until it returns to the normal pressure of 2.5 bar. When PT decreases to PT ≤ 2.55 bar, the pump will restart, and the transfer process will continue until the liquid level in pressure vessel 1 reaches LT ≥ 5 m. 3 When the liquid transfer pump 3 stops, the system completes one work cycle and prepares for the next work cycle.

[0085] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A system for preventing gas supply pipeline pressure buildup, characterized in that, include, A pressure vessel is provided with a predetermined volume of liquid. The gas transmission port at the upper end of the pressure vessel is connected to the main gas supply pipeline of an external gas supply system. The pressure vessel is provided with a pressure sensor for detecting the pressure of the external gas supply system and a liquid level sensor for detecting the liquid level inside the pressure vessel. An atmospheric pressure vessel, wherein the liquid transmission port at the bottom of the pressure vessel is connected to the interior of the atmospheric pressure vessel through a first connecting pipe, and the liquid discharge port at the bottom of the atmospheric pressure vessel is connected to the liquid transmission port at the bottom of the pressure vessel through a second connecting pipe, wherein an automatic regulating valve is provided on the first connecting pipe, and a liquid delivery pump is provided on the second connecting pipe; An automation controller is connected to the pressure sensor, the liquid level sensor, the automatic regulating valve, and the liquid transfer pump. It receives the pressure signal output by the pressure sensor and the liquid level signal output by the liquid level sensor. Based on the pressure signal and the liquid level signal, the automation controller outputs a valve control signal to the automatic regulating valve and a pump control signal to the liquid transfer pump. The system performs the following steps to prevent gas supply pipeline pressure buildup: Step S1: When the external gas supply system is switched, the gas pressure in the pressure vessel rises. When the pressure of the external gas supply system is greater than or equal to a fourth pressure setting value, the automatic regulating valve opens, and the liquid phase in the pressure vessel flows into the atmospheric pressure vessel through the first connecting pipe. Step S2: When the liquid level inside the pressure vessel is less than or equal to a first liquid level setting value or the pressure of the external gas supply system is less than or equal to a second pressure setting value, the automatic regulating valve is closed. Step S3: When the pressure of the external gas supply system drops to less than or equal to a first pressure set value, the liquid transfer pump is turned on, and the liquid phase in the atmospheric pressure container is sent back to the pressure container through the second connecting pipe. Step S4: Detect whether the pressure of the external air supply system rises again to a level greater than or equal to a third pressure setting value. If yes, proceed to step S5; otherwise, wait for the liquid level in the pressure vessel to rise to a level greater than or equal to a second liquid level setting value, complete one work cycle, and return to step S1 to execute the next work cycle. Step S5: Turn off the liquid transfer pump and check whether the pressure of the external air supply system continues to rise. If the pressure of the external air supply system rises to a level greater than or equal to the fourth pressure setting value, open the automatic regulating valve and return to step S2. If the pressure of the external air supply system falls back to a level less than or equal to the first pressure setting value, the liquid transfer pump is restarted and step S3 continues. The first pressure setting value is greater than the pressure when the external gas supply system is working normally; the second pressure setting value is greater than the first pressure setting value; the third pressure setting value is greater than the second pressure setting value; and the fourth pressure setting value is greater than the second pressure setting value. The second liquid level setting value is the highest liquid level value of the pressure vessel, and the first liquid level setting value is the lowest liquid level value of the pressure vessel.

2. The system for preventing gas supply pipeline pressure buildup according to claim 1, characterized in that, The first connecting pipe extends from the top of the atmospheric pressure vessel to the bottom of the atmospheric pressure vessel.

3. The system for preventing gas supply pipeline pressure buildup according to claim 1, characterized in that, A flow regulating valve for controlling the liquid flow rate is provided on the first connecting pipe downstream of the automatic regulating valve.

4. The system for preventing gas supply pipeline pressure buildup according to claim 1, characterized in that, A one-way valve is provided on the second connecting pipe downstream of the liquid transfer pump.

5. The system for preventing gas supply pipeline pressure buildup according to claim 1, characterized in that, A safety valve is provided between the first connecting pipe and the second connecting pipe.

6. The system for preventing gas supply pipeline pressure buildup according to claim 1, characterized in that, The atmospheric pressure container has an overflow port at the top, a vent at the top, and a replenishment valve at the bottom, which is connected to an external replenishment pipeline.

7. The system for preventing gas supply pipeline pressure buildup according to claim 1, characterized in that, The pressure vessel has a first maintenance shut-off valve at the liquid transfer port at the bottom, and the atmospheric pressure vessel has a second maintenance shut-off valve at the drain port at the bottom.

8. The system for preventing gas supply pipeline pressure buildup according to claim 1, characterized in that, A separation device is provided at the interface between the gas and the liquid phase inside the pressure vessel.

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