A method and system for controlling the air volume of a dual-gate gas lifting system for LNG storage tanks.

Abstract

A dual-gate airflow control method and system for LNG storage tank gas lifting includes the following steps: starting the gas source, fine-tuning the opening of the electric gate to bring the gas pressure inside the chamber within a preset equilibrium pressure band, increasing the opening of both the electric and manual gates, and then using the electric gate to regulate the gas pressure inside the tank lifting chamber; when the dome rises to a preset proximity distance from the predetermined height, reducing the opening of the electric gate and performing a dome status check; after the dome status check is passed, dynamically increasing the opening of the electric gate to allow the dome to complete the remaining stroke and be welded at the predetermined height, at which point the openings of both the electric and manual gates are reduced to zero. This dual-gate airflow control method uses a series-connected, coordinated control of the electric and manual gates, ensuring precise and safe adjustment.

Description

Technical Field

[0001] This invention relates to the field of LNG storage tanks, and more specifically to the field of gas lifting technology. Background Technology

[0002] The installation of the dome of liquefied natural gas (LNG) storage tanks commonly employs a pneumatic jacking process. This process involves the following steps: after forming a sealed cavity inside the tank, air is continuously supplied into the cavity. The cavity pressure slowly lifts the dome, weighing hundreds of tons, from the supporting columns. Once the dome reaches the predetermined height, it is welded and fixed to the components on the tank wall. This process is the most complex and highest-risk core construction node in LNG storage tank construction, including pre-jacking, multiple inspections, and pneumatic jacking stages, placing extremely high demands on the precision of pneumatic pressure control and the adaptability to different stages.

[0003] Currently, in the construction of LNG storage tank pneumatic jacking, manual gate valves are commonly used for air volume regulation and control. As recorded by Wang Yangjian in "Design and Control of Power System for Pneumatic Jacking Operation of Large LNG Storage Tank Top" (Petrochemical Construction, 2020, 42(1):66-67.) and Li Yi et al. in "Research on Overall Pneumatic Jacking Construction Technology of Large Cryogenic Storage Tank Arch and Internal Ceiling" (China Equipment Engineering, 2024, (5):237-240.), the operators manually adjust the opening and closing degree of the gate valve based on experience to meet the air pressure change requirements throughout the process. This method is not only cumbersome, but also has unavoidable lag and accuracy deviation, making it difficult to achieve fine adjustment of air pressure. It is easy to cause unstable air pressure during tank jacking, resulting in problems such as excessively fast or slow jacking speed or tank tilting. Existing solutions also include those using automated control structures. For example, Chinese patent CN217503327U discloses an automated control system for the construction of large LNG storage tanks. This system uses an automatic control terminal to control the pressurizing fan, thereby controlling the air intake and the rising speed of the tank top and the air pressure inside the pipes. However, this method, which relies solely on electrical control, poses a significant safety hazard should any electrical control component fail.

[0004] How to safely and accurately achieve phased air pressure control during the high-risk construction process of arch jacking is a problem that needs to be solved. Summary of the Invention

[0005] One object of the present invention is to provide a dual-gate airflow control method for LNG storage tank gas lifting.

[0006] To achieve the above objectives, a dual-gate airflow control method for LNG storage tank gas lifting is applied to an electric gate and a manual gate connected in series on the airflow delivery pipeline. The electric gate is located upstream near the gas source, and the manual gate is located downstream near the storage tank. The control method includes the following steps: activating the gas source, adjusting the manual gate to a first opening degree and then locking it; adjusting the electric gate to a second opening degree, which is smaller than the first opening degree, causing the gas pressure inside the storage tank cavity to slowly rise until the dome and supporting columns begin to separate; keeping the manual gate locked, and fine-tuning the opening degree of the electric gate to... The air pressure inside the storage tank cavity is within a preset equilibrium pressure zone. When the dome is raised after passing the dome suspension inspection, the manual gate is opened wider, and the electric gate is used to adjust the air pressure inside the storage tank cavity. When the distance between the dome and the predetermined height decreases to a preset proximity distance, the opening of the electric gate is reduced, so that the air pressure inside the storage tank cavity is again within the preset equilibrium pressure zone. After the dome status inspection is passed, the opening of the electric gate is increased, so that the dome completes the remaining stroke and is located at the predetermined height. The dome welding work is then carried out, and the openings of the electric gate and the manual gate are gradually reduced until the welding is completed.

[0007] In one or more embodiments, a first-level pressure reduction is performed after the arch is completed with a tack weld; a second-level pressure reduction is performed after the first circumferential continuous weld is completed; and a third-level pressure reduction is performed after all welds are completed, until the opening degree of both the electric gate and the manual gate is reduced to zero.

[0008] In one or more embodiments, when the electric gate malfunctions, the control power supply to the electric gate is cut off and the airflow is switched to be controlled by the manual gate.

[0009] In one or more embodiments, during the lifting stage, a dual-closed-loop PID control method is used to control the electric gate. The control method includes the following steps: taking the real-time rising speed of the arch as the outer loop control object and the air pressure change rate inside the storage tank cavity as the inner loop control object, and adjusting the motor driving the electric gate to correct the air volume output in real time.

[0010] In one or more embodiments, if the instantaneous drop rate of air pressure inside the storage tank cavity exceeds a preset safety threshold or the rising speed of the dome is negative during the lifting of the dome, a rapid closing command is immediately issued to the electric gate and the manual gate.

[0011] In one or more embodiments, the first opening is 50% to 70%; the second opening is 10% to 20%.

[0012] Another objective of this invention is to provide a dual-gate airflow control system for LNG storage tank gas lifting. This system includes an airflow delivery pipeline, an electric gate, a manual gate, a pressure detection module, and a control module. The airflow delivery pipeline has its inlet connected to a gas source and its outlet connected to the storage tank cavity. The electric gate is located upstream of the airflow delivery pipeline, near the gas source. The manual gate is connected in series downstream of the electric gate, also near the storage tank. The pressure detection module includes multiple detection points located within the storage tank cavity for real-time acquisition of internal pressure data. The control module is signal-connected to the electric gate and the pressure detection module, receiving pressure data and issuing adjustment commands.

[0013] In one or more embodiments, multiple air volume delivery pipes are arranged in parallel, and each air volume delivery pipe is equipped with an electric gate and a manual gate connected in series. Each air volume delivery pipe is signal-connected to the control module.

[0014] In one or more embodiments, the manual gate includes a gate body, a hand chain hoist, and a fixed bracket, wherein the hand chain hoist is connected to the fixed bracket and is used to drive the gate to open and close.

[0015] In one or more embodiments, the manual gate further includes a locking mechanism connected to the hand chain hoist for fixing the manual gate at a set opening position.

[0016] The above-mentioned dual-gate airflow control method uses electric and manual gates in series and coordinated control. The electric gate is used as the main control adjustment element with a small opening at the upstream, while the manual gate is used as the upper limit of safety capacity and the last physical barrier at the downstream. At each stage of air lifting, the pressure inside the tank is adjusted according to the different requirements of each stage, which can always ensure the safety of operation under different working conditions. Attached Figure Description

[0017] The above and other features, properties and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the dual-gate airflow control system for LNG storage tank gas lifting. Figure 2 This is a schematic diagram of a specific embodiment of a dual-gate airflow control system; Figure 3 This is the control flowchart for the electric gate during the air-lifting stage; Figure 4 This is a schematic diagram of a specific embodiment of the dual-gate opening at different air-lifting stages; Figure 5 This is a schematic diagram of a manual gate. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from those described herein. Those skilled in the art can make similar extensions and derivations based on actual application situations without departing from the spirit of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0019] It should be noted that these and other accompanying drawings are merely examples and are not drawn to scale, and should not be construed as limiting the scope of protection of the present invention.

[0020] The dual-gate airflow control method for LNG storage tank gas jacking uses, for example... Figure 1 and Figure 2 The precision control system shown is in operation.

[0021] The system includes an air delivery pipeline 101, an electric gate 102, a manual gate 103, an air pressure detection module 104, and a control module 105.

[0022] The air inlet of the air delivery pipe 101 is connected to an air source 109, such as a blower, and the outlet is connected to the storage tank cavity 110. The connection between the air delivery pipe 101 and the storage tank is welded and sealed, serving as the sole channel for supplying gas to the top cavity of the storage tank. When the air pressure inside the storage tank cavity 110 exceeds the weight of the dome 108, the dome 108 is pushed upward by the air pressure until it reaches the top of the tank.

[0023] Multiple parallel air delivery pipelines and air sources can be installed simultaneously, such as... Figure 1 As shown, another airflow delivery pipeline is configured in parallel: air source 109', electric gate 102', and manual gate 103'. In some embodiments, 2 to 4 parallel delivery pipelines can be configured. Each delivery pipeline is signal-connected to the control module 105.

[0024] The electric gate 102 is installed on the upstream side of the main pipeline near the gas source 109. It is driven by a motor and equipped with a high-precision position sensor, frequency conversion adjustment module and PLC control unit. At the same time, it establishes a data transmission connection with the control module 105 to realize remote monitoring and adjustment.

[0025] The high-precision position sensor is preferably 0.1% accurate, and can provide real-time and accurate feedback of the gate opening and closing degree data.

[0026] Specifically, operators can monitor air pressure changes in real time through the output data of the air pressure detection module 104. When the air pressure deviates from the set range, the operator can manually rotate the electric gate opening and closing knob or the control module can automatically issue an adjustment command to the electric gate, which will then automatically open and close to precisely adjust the airflow. This can control the air pressure fluctuation within the LNG storage tank's lifting cavity within ±0.2 kPa.

[0027] The manual gate 103 is installed downstream of the pipeline near the storage tank and is connected in series with the electric gate 102. The two are separated by a set distance, such as 1200-1500mm. This set distance ensures smooth airflow and that the two gates do not interfere with each other when they are opened and closed.

[0028] The specific structure of the manual gate 103 is as follows: Figure 5 As shown, the device includes a gate body 1030, which is mounted on a fixed bracket 18 via a hand-operated hoist 19. The opening degree of the gate body 1030 is controlled by the hand-operated hoist 19. The fixed bracket 18 is welded and fixed to the main pipeline, providing stable support for the gate body 1030 and preventing the gate from shifting due to airflow impact during adjustment. The hand-operated hoist 19 serves as the sole power source for manual adjustment. The manual gate is also connected to a locking mechanism, which reliably fixes the hand-operated hoist in the set position, preventing the manual gate from shifting.

[0029] The gate body is made of high-strength carbon steel, which makes it structurally stable and resistant to airflow impact.

[0030] Both manual and electric gates are equipped with opening lines, with precise markings indicating the opening and closing degrees from 0% to 100%, allowing for intuitive reading of the adjustment range. The opening lines on the manual gates also facilitate coarse adjustments by the operator.

[0031] The air pressure detection module 104 includes multiple detection points deployed within the tank cavity. For example, multiple high-precision pressure transmitters with a detection accuracy of ±0.05 kPa are respectively deployed beside the pressure relief valve on the sealing plate of the main gate opening at the top of the tank and at the blind flange of the casing. They transmit detection data once per second to comprehensively and accurately collect real-time air pressure data within the tank's lifting cavity, avoiding errors from single-point detection. The detection data is synchronously transmitted to the control module via a data transmission line, providing real-time and accurate data for the fine adjustment of the electric gate, and also providing an intuitive air pressure reference for manual emergency adjustment.

[0032] The control module 105 establishes a signal connection with the electric gate 102 and the air pressure detection module 104 to directly control the opening degree of the electric gate.

[0033] In this system, the electric gate 102 acts as the main throttling element with a small opening upstream, while the manual gate 103 acts as a safety capacity barrier with a large opening downstream. Fine-tuning of the flow rate in the series pipeline relies on the upstream electric gate; even a small change in opening can produce a significant and predictable pressure response. In terms of safety, even if the electric gate malfunctions, the limited opening of the downstream manual gate can still constrain the airflow into the storage tank. In case of emergency, it can physically and instantly isolate the storage tank from the entire gas supply pipeline, preventing uncontrolled pressure.

[0034] The system does not require significant modifications to the existing lifting equipment and is highly adaptable.

[0035] The following section introduces the dual-gate airflow control method, taking into account the specific steps of LNG tank gas lifting and the aforementioned dual-gate airflow control system.

[0036] First, the air source is activated, for example, by setting the blower to its rated output, to initiate the pre-lifting process. The operator uses a hand-operated hoist to adjust the manual gate to the first opening degree and the electric gate to the second opening degree, where the second opening degree is less than the first opening degree, so that the air pressure inside the tank's lifting chamber reaches the preset initial lifting threshold, such as 1490 Pa. In one specific embodiment, the first opening degree is 50%~70%; the second opening degree is 10%~20%.

[0037] The throttling effect of the series gate valve pipeline is mainly determined by the opening degree of the upstream electric gate valve 102. After both gates are opened, the gas pressure inside the storage tank cavity rises slowly. The subsequent manual gate valve 103 is locked at its opening degree to prevent the gate valve from shifting under the action of airflow, ensuring the stability of the basic air volume. At the same time, as a physical safety limit, even if the electric gate valve is accidentally fully opened, the gas pressure inside the cavity will not exceed the maximum value allowed by the capacity limit of the manual gate valve.

[0038] The operator continuously observes the average air pressure at each detection point in the control module until the arch 108 shows initial signs of separation from the supporting column supporting the arch, at which point the arch suspension check begins.

[0039] During the dome suspension check, the opening of the electric gate 102 is finely adjusted to keep the air pressure inside the tank cavity 110 within the preset equilibrium pressure zone. The preset equilibrium pressure zone is designed to ensure that the supporting force of the air pressure inside the tank cavity 110 on the dome 108 is approximately equal to the weight of the dome 108. Specifically, it can be calculated by dividing the weight of the dome by the effective pressure-bearing area of ​​the lifting cavity and then adding the sealing friction correction.

[0040] When the air pressure inside the storage tank cavity 110 remains stable within this range and reaches the preset duration, such as 5 or 8 minutes and the air pressure deviation at each detection point does not exceed the preset threshold, the conditions for personnel to enter the tank for inspection are deemed met.

[0041] Subsequently, operators entered the storage tank to check the separation of the dome 108 from each supporting column. During this period, the opening of the electric gate 102 was maintained at a condition that kept the air pressure inside the tank cavity 110 within a preset equilibrium pressure zone. For example, based on the air pressure inside the cavity being within 5% of the opening, the electric gate 102 was dynamically fine-tuned to ensure the safety of personnel inside the tank. This method not only significantly reduces the number of personnel required to control the gate on-site but also provides a more precise adjustment effect.

[0042] If the suspension inspection is deemed satisfactory, the air-lifting phase will then commence.

[0043] Increasing the opening degree of the electric gate 102 and the manual gate 103 raises the air pressure inside the storage tank cavity 110 to above the equilibrium pressure zone, causing the dome 108 to begin rising. As the dome 108 continues to rise, the cavity volume increases, and the air volume required to maintain the predetermined rising rate continues to increase, requiring the electric gate 102 to increase its opening degree accordingly. The preset normal air pressure range for the storage tank dome lifting is 1490-1639 Pa.

[0044] For example, the opening degree of the electric gate 102 is gradually increased to 30-40%, 50-60%, and 70-80%, while the opening degree of the manual gate 103 is gradually increased to 70-80% and 80-99%, and the opening degree of the manual gate 103 is locked again after the manual gate 103 reaches the required level.

[0045] For example, during the lifting phase, when the average air pressure is detected to be lower than the preset lower limit (e.g., 1490 Pa) or higher than the preset upper limit (e.g., 1639 Pa), the operator can rotate the opening / closing knob of the electric gate 102, or the control center can directly issue an adjustment command to the electric gate 102 to make corresponding adjustments. If the air pressure is too low, the opening degree of the electric gate 102 is increased to increase the airflow to compensate for the air pressure; if the air pressure is too high, the opening degree of the electric gate 102 is decreased to reduce the airflow to stabilize the air pressure and ensure the stability of the entire lifting process.

[0046] During this stage, the air volume demand increases rapidly throughout the entire lifting process. Traditional single-gate systems cannot maintain precise resolution throughout the entire stroke, while the series structure of dual-gate systems allows for a rapid and precise increase in air volume throughout the lifting process. At the same time, by coarsely adjusting the manual gate, a higher flow rate benchmark is reset, allowing the electric gate to continue performing precise adjustments under the new benchmark, preventing the non-linear increase in flow rate that is prone to occur with traditional single-gate systems.

[0047] In a preferred embodiment, the fine adjustment of the electric gate can be achieved using a dual-closed-loop PID control method. Due to the compressibility of air, there is an inherent physical lag between changes in the internal air pressure and the actual displacement response of the dome. For large storage tanks, where the volume of the lifting cavity can reach thousands of cubic meters, this lag is particularly significant. If a simple feedback control method is used with the dome's rising speed or air pressure as the sole control objective, the controller must wait for the dome displacement signal to reflect the air pressure change before responding. This control lag is difficult to eliminate and can easily lead to overshoot problems.

[0048] Based on this, the outer ring uses the real-time rising speed of the arch 108 as the control object, and the set value is the target rising speed preset according to the construction specifications, such as... Figure 3 As shown, the outer-loop PID controller takes the deviation between the actual lift-off speed and the target speed as input, and outputs the desired rate of change of air pressure within the cavity. The inner-loop PID controller takes the deviation between the actual rate of change of air pressure and the desired rate of change of air pressure as input, and outputs the motor drive signal controlling the opening of the electric gate. The control module synchronously receives commands, drives the motor to actuate, and performs fine-tuning of the electric gate's opening and closing degree in increments of 0.5%, thereby regulating the airflow and air pressure. This method can suppress the transmission hysteresis effect caused by the compressibility of gas, further improving the accuracy of regulation.

[0049] As the arch 108 rises until it reaches a predetermined proximity to the target height, the operator gradually reduces the opening of the electric gate 102. The air pressure inside the chamber slowly decreases, re-entering the balanced pressure zone, causing the arch to decelerate and hover. During this stage, the arch's condition is checked again, including parameters such as its inclination, edge alignment, and the relative position of the arch to the bearing ring, to ensure that the arch's rising position meets the requirements.

[0050] Finally, after the arch condition inspection is qualified, the opening of the electric gate 102 is dynamically increased so that the air pressure in the cavity is slightly higher than the balance pressure band. The arch completes the remaining stroke and is positioned at the predetermined height, and the welding work between the arch and components such as the pressure ring begins.

[0051] During the welding process, the pressure reduction process can be carried out in stages.

[0052] Such as combination Figure 4 The process involves performing a first-stage depressurization after the dome and pressure ring are properly positioned and welded, lowering the internal pressure to the equilibrium pressure zone. For example, this can be done by gradually reducing the opening degree of the electric gate by rotating the gate's knob, slowly reducing the pressure inside the tank to the initial lifting threshold, such as 1490 Pa. Then, the operator pulls the manual hoist to gradually close the manual gate, while simultaneously reducing the speed of the blower to gradually decrease the airflow and prevent sudden pressure drops that could cause tank swaying.

[0053] The first circumferential continuous weld was then performed. After the circumferential weld was completed, the opening and closing degree of the electric gate and the manual gate were further reduced.

[0054] After all welds are completed and the storage tank is fully secured and the air pressure drops to a safe range, the third stage of depressurization is carried out. The electric gate and the manual gate are alternately reduced in opening until both drop to zero.

[0055] Finally, the gas supply was shut off, and the pressure in the tank's jacking chamber was depressurized.

[0056] Furthermore, if the control module detects a danger signal during the process, such as a sudden drop in internal air pressure exceeding a preset safety threshold, or a negative rising speed of the dome, it indicates that the preconditions for continuing the dome raising have been violated, and the dome is at risk of falling and becoming unstable. The control module will immediately issue a rapid closing command to both the electric and manual gates. For example, both can be closed simultaneously, or the manual gate, which is closer to the tank, can be closed first. After both gates are closed, the remaining air pressure inside the cavity is isolated from the external atmosphere, continuing to provide some support to the dome.

[0057] When the electric gate experiences a power outage or electrical fault, the control module immediately triggers an audible and visual alarm. The operator then cuts off the power supply to the electric gate and switches the airflow control to a purely manual mode, with the manual gate as the primary control element. The operator reads the real-time air pressure data inside the storage tank using feedback data from the air pressure detection module or a local pressure gauge. They then unlock the chain hoist and slowly adjust the manual gate's opening by pulling it according to the gate's scale, adjusting it by 1-2% at a time to gradually restore the air pressure inside the storage tank to the preset normal range.

[0058] At this time, the manual gate acts as an emergency adjustment tool, which can quickly stabilize the air pressure and effectively ensure the safety of the lifting process.

[0059] The aforementioned dual-gate control method, through the series coordination and collaborative control of manual and electric gates, offers significant advantages over single-gate control schemes in gas jacking processes with multi-stage requirements. Furthermore, this flexible approach adapts to different LNG storage tank specifications, varying construction conditions, and various unforeseen circumstances.

[0060] In some embodiments, numbers describing the quantity of components and attributes are used. It should be understood that such numbers used in the description of embodiments are modified in some examples with the terms "approximately," "approximately," or "generally." Unless otherwise stated, "approximately," "approximately," or "generally" indicates that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may be changed according to the characteristics required by individual embodiments. In some embodiments, numerical parameters should take into account specified significant digits and employ a general method of digit reservation. Although the numerical ranges and parameters used to confirm their breadth of scope in some embodiments of this application are approximate values, in specific embodiments, such values ​​are set as precisely as feasible. Those skilled in the art will understand that the above specific parameter values ​​can be adaptively adjusted in combination with different tank specifications and dome weights.

[0061] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any variations and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the scope of the invention, fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for controlling the airflow of a dual-gate gas lifting system for LNG storage tanks, characterized in that, The control method uses an electric gate and a manual gate connected in series on an air delivery pipeline. The electric gate is located upstream near the air source, and the manual gate is located downstream near the storage tank. The control method includes the following steps: Start the gas source, so that the manual gate is locked after being adjusted to the first opening degree, and the electric gate is adjusted to the second opening degree, which is smaller than the first opening degree, so that the gas pressure in the storage tank cavity rises slowly until the dome and the supporting column are initially separated. Keep the manual gate in the locked state and finely adjust the opening of the electric gate so that the air pressure in the tank cavity is within the preset equilibrium pressure band. After the dome suspension inspection is passed, when raising the dome, the manual gate is opened more and the electric gate is used to adjust the air pressure inside the storage tank cavity. When the distance between the dome and the predetermined height decreases to the preset proximity distance, the opening of the electric gate is reduced so that the air pressure in the tank cavity is once again within the preset equilibrium pressure zone; After the arch condition inspection is passed, the opening of the electric gate is increased so that the arch completes the remaining stroke and is located at the predetermined height for arch welding. The opening of the electric gate and the manual gate is then gradually decreased until welding is completed.

2. The method as described in claim 1, characterized in that, During the welding stage, the first level of pressure reduction is performed after the arch is tack welded; the second level of pressure reduction is performed after the first circumferential continuous weld is completed; and the third level of pressure reduction is performed after all welds are completed, until the opening degree of both the electric gate and the manual gate is reduced to zero.

3. The method as described in claim 1, characterized in that, When the electric gate malfunctions, the control power supply to the electric gate is cut off and the manual gate is used to control the air volume.

4. The method as described in claim 1, characterized in that, During the lifting stage, a dual-closed-loop PID control method is used to control the electric gate. The control method includes the following steps: taking the real-time rising speed of the arch as the outer loop control object and the air pressure change rate in the tank cavity as the inner loop control object, and adjusting the motor driving the electric gate to correct the air volume output in real time.

5. The method as described in claim 1, characterized in that, If, during the lifting of the roof, the instantaneous drop rate of the gas pressure inside the storage tank exceeds a preset safety threshold, or if the roof's rising speed becomes negative, a rapid closing command is immediately sent to the electric gate and the manual gate.

6. The method as described in claim 1, characterized in that, The first opening is 50% to 70%; the second opening is 10% to 20%.

7. A dual-gate airflow control system for LNG storage tank gas lifting, characterized in that, For performing the method as described in any one of claims 1-6, the system comprises: The air delivery pipeline has its inlet end connected to the air source and its outlet end connected to the storage tank cavity. An electric gate is installed upstream of the air delivery pipeline and close to the air source. A manual gate is connected in series downstream of the electric gate and close to the side of the storage tank; The air pressure detection module includes multiple detection points deployed within the tank cavity for real-time acquisition of air pressure data within the cavity; and The control module is connected to the electric gate and the air pressure detection module, and is used to receive air pressure data and issue adjustment commands.

8. The system as described in claim 7, characterized in that, Multiple air volume delivery pipes are connected in parallel, and each air volume delivery pipe is equipped with an electric gate and a manual gate connected in series. Each air volume delivery pipe is signal-connected to the control module.

9. The system as described in claim 7, characterized in that, The manual gate includes a gate body, a hand chain hoist, and a fixed bracket. The hand chain hoist is connected to the fixed bracket and is used to drive the gate to open and close.

10. The system as described in claim 9, characterized in that, The manual gate also includes a locking mechanism connected to the hand chain hoist, used to fix the manual gate at a set opening position.

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