LNG receiving station tank pressure detection system and detection method

Abstract

The application relates to the technical field of pressure detection, in particular to a LNG receiving station tank internal pressure detection system and a detection method, which comprises a pressure detection module and a gas storage tank, and the pressure detection module is arranged on the gas storage tank. The pressure detection module comprises a pipe, a sliding block and a sealing column, a sealing ring is arranged on the pipe, an installation plate is arranged on the pipe, a controller is arranged on the installation plate, and the controller is connected with a pressure gauge. A sliding groove A is arranged on the pipe. The sliding block is arranged in the pipe, two clamping blocks are symmetrically and elastically arranged in the sliding block, an outer thread pipe penetrates through the sliding block and is screw-connected with the sliding block, a driving piece for driving the outer thread pipe to rotate is arranged in the pipe. The sealing column is arranged on the inner side of the installation plate, the sealing column is located in the outer thread pipe, a pressure detection probe is detachably arranged on the inner side of the sealing column, and the pressure detection probe is connected with the controller. The application can realize effective and rapid disassembly, the pressure detection probe can be replaced conveniently and simply in the subsequent replacement, and gas leakage does not occur.

Description

Technical Field

[0001] This invention relates to the field of pressure detection technology, and in particular to a pressure detection system and method for LNG receiving station tanks. Background Technology

[0002] LNG storage tanks are special equipment that require real-time monitoring of their internal gas pressure. If a gas leak occurs, it can easily lead to irreversible losses. The gas pressure inside the tank is mainly detected by a pressure detection system. Traditional pressure detection systems mainly use mechanical pressure gauges for pressure detection, which have low accuracy. Currently, electric pressure gauges are commonly used for detection. Electric pressure gauges provide high accuracy, but their main probe structure, namely the sensor, has a limited lifespan and is very troublesome to replace.

[0003] Chinese Patent CN218787486U discloses a pressure monitoring device for LNG storage tanks, relating to the field of pressure monitoring equipment technology. The device includes a conduit with a chuck at one end and a locking bolt passing through the outer wall of the chuck. A sealing sleeve is fitted to the center of the inner wall of the chuck. A pressure relief assembly is installed on the outer wall of one end of the conduit, and a connecting pipe passes through the top of the conduit. A pressure gauge is installed at the top of the connecting pipe, and an antenna is electrically connected to the outer wall of the pressure gauge. A power supply assembly is installed at the top of the pressure gauge. Through the coordination of an adjusting handwheel, a pressure relief pipe, and a pressure relief nozzle, pressure is transmitted via the handwheel connecting the pressure relief pipe to the conduit. When the pressure inside the tank is too high, turning the handwheel loosens the pressure relief pipe, allowing the pressure to be released through the pressure relief nozzle. This solves the problem of the inability to release high pressure inside the tank, which could easily lead to tank expansion.

[0004] However, the device still has shortcomings: First, the device will automatically depressurize when the pressure inside the tank is too high. As is known, liquefied petroleum gas is an extremely flammable and explosive gas, and the device generates electricity through solar panels, which are extremely hot. If the pressure is directly depressurized, the consequences would be unimaginable. Furthermore, if the pressure detection element needs to be replaced after the device is installed, the entire gauge needs to be removed, at which point the liquefied petroleum gas will leak directly, and the operation is also cumbersome. Summary of the Invention

[0005] The purpose of this invention is to address the problems existing in the background art by proposing an LNG receiving terminal tank pressure detection system and detection method.

[0006] The technical solution of the present invention: On one hand, the present invention proposes an LNG receiving station tank pressure detection system, including a pressure detection module and a gas storage tank, wherein the pressure detection module is installed on the gas storage tank.

[0007] The pressure detection module includes a tube, a slider, and a sealing post. A sealing ring is installed on the outside of the tube, and a mounting plate is mounted on the top of the tube. A controller is mounted on the mounting plate and connected to a pressure gauge. A groove A is provided on the tube, located below the sealing ring. The slider is slidably positioned inside the tube, and two symmetrically and elastically sliding blocks are installed within the slider. These blocks extend along the inner side of their respective side grooves A and are slidably connected to them. An externally threaded tube is rotatably mounted inside the tube, passing through the slider and helically connected to it. A drive component is installed inside the tube to rotate the externally threaded tube. The sealing post is detachably mounted inside the mounting plate, located within the externally threaded tube and sealingly fitted with it. A pressure detection probe is detachably mounted inside the sealing post and connected to the controller.

[0008] Preferably, the system also includes a flow detection module and an alarm module, both of which are connected to the alarm module via a controller. The flow detection module includes an outlet pipe, flow meter A, and flow meter B. The outlet pipe is connected to the output end of the gas storage tank, and the output end of the outlet pipe is connected to a valve. Flow meter A and flow meter B are located at the input and output ends of the valve, respectively.

[0009] Preferably, the driving component includes a turbine and a worm. The turbine is sleeved on the outside of the externally threaded tube and fixedly connected to it, the worm is disposed inside the insertion tube and rotatably connected to it, and the outer end of the worm extends out of the insertion tube, and the worm is meshed with the turbine.

[0010] Preferably, a connector is provided on the mounting plate, a sealing post is located inside the connector and slidably connected to it, a sealing sleeve is provided at the top of the sealing post, and the sealing sleeve is spirally connected to the connector.

[0011] Preferably, a connecting wire is detachably installed on the sealing sleeve, and the connecting wire is connected to the controller.

[0012] Preferably, a groove B is provided above the bottom surface of the sealing column, the pressure detection probe is located inside the groove B and is detachably connected to the sealing column, and a limiting ring is provided at the bottom of the sealing column.

[0013] On the other hand, the present invention also proposes a method for detecting the pressure inside an LNG receiving station tank, comprising the following steps;

[0014] S1. Install the pressure detection module, insert the tube into the pre-drilled hole of the gas tank. During the insertion process, the clamp will automatically retract first, and then automatically pop out after entering the gas tank. Then, the external threaded tube will be driven to rotate by the drive component, causing the slider to rise. The clamp will then be used to clamp and seal from the inside of the gas tank with the external sealing ring.

[0015] S2. Release the lock on the sealing column, pull the sealing column up to the appropriate height, install the pressure detection probe, then press down the sealing column and lock it, connect the sealing column to the controller and power on.

[0016] S3. After adding gas to the gas tank, seal it. The pressure detection probe detects the current pressure value in the gas tank. The pressure value is analyzed and calculated by the controller and then displayed on the pressure gauge.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects:

[0018] By incorporating a driveable, lifting slider within the insertion tube, and two symmetrically and elastically sliding locking blocks within the slider, installation is simple: press the insertion tube down to insert it into the gas tank, at which point the locking blocks pop out automatically. Pulling up the slider then uses the locking blocks and sealing rings to secure it to the gas tank. For later removal, simply press down the slider, causing the locking blocks to retract automatically at the lower edge of the slide groove A, allowing for easy removal of the insertion tube. The operation is simple and convenient. Furthermore, considering the lifespan of the main sensor structure of the pressure detection probe under long-term operation in a liquefied gas environment, this invention prevents gas leakage during probe replacement. Simultaneously, this invention can automatically determine whether the gas leak is originating from the gas tank itself or an external pipeline, and automatically triggers an alarm when an anomaly occurs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention;

[0020] Figure 2 This is a diagram showing the connection structure of the various components on the cannula;

[0021] Figure 3 This is a diagram showing the connection structure between the slider and the externally threaded pipe.

[0022] Figure 4 This is a diagram showing the connection structure of the various components on the sealing column;

[0023] Figure 5 Connection structure diagram of various components on the gas storage tank.

[0024] Reference numerals: 1. Insertion tube; 101. Slide A; 2. Sealing ring; 3. Mounting plate; 4. Controller; 5. Pressure gauge; 6. Slider; 7. Clamping block; 8. External threaded pipe; 9. Turbine; 10. Worm gear; 11. Connector; 12. Sealing sleeve; 13. Connecting wire; 14. Sealing column; 141. Slide B; 142. Limiting ring; 15. Pressure detection probe; 16. Gas tank; 17. Gas outlet pipe; 18. Flow meter A; 19. Valve; 20. Flow meter B. Detailed Implementation

[0025] Example 1

[0026] like Figures 1-5As shown, the present invention proposes an LNG receiving station tank pressure detection system, which includes a pressure detection module and a gas storage tank 16, with the pressure detection module installed on the gas storage tank 16.

[0027] The pressure detection module includes a tube 1, a slider 6, and a sealing post 14. A sealing ring 2 is installed on the outside of the tube 1, and a mounting plate 3 is installed at the top of the tube 1. A controller 4 is installed on the mounting plate 3, and the controller 4 is connected to a pressure gauge 5. A sliding groove A101 is provided on the tube 1, located below the sealing ring 2. The slider 6 is slidably disposed inside the tube 1. Two locking blocks 7 are symmetrically and elastically disposed inside the slider 6. The locking blocks 7 on both sides extend out along the inner side of the corresponding sliding groove A101 and are slidably connected to it. An externally threaded tube 8 is rotatably disposed inside the tube 1, passing through the slider 6 and being helically connected to it. A driving component for driving the externally threaded tube 8 to rotate is provided inside the tube 1. The driving component includes a turbine 9 and a worm gear 10. The turbine 9 is sleeved on the outside of the externally threaded tube 8 and fixedly connected to it. The worm gear 10 is disposed inside the tube 1 and rotatably connected to it, with its outer end extending out of the tube 1. The worm gear 10 is meshed with the turbine 9. A sealing column 14 is detachably mounted inside the mounting plate 3. A connector 11 is mounted on the mounting plate 3. The sealing column 14 is located inside the connector 11 and is slidably connected to it. A sealing sleeve 12 is mounted on the top of the sealing column 14, and the sealing sleeve 12 is spirally connected to the connector 11. A connecting wire 13 is detachably mounted on the sealing sleeve 12 and is connected to the controller 4. The sealing column 14 is located inside the external threaded pipe 8 and is sealed to its interior. A pressure detection probe 15 is detachably mounted inside the sealing column 14 and is connected to the controller 4. A groove B141 is provided above the bottom surface of the sealing column 14. The pressure detection probe 15 is located inside the groove B141 and is detachably connected to the sealing column 14. A limiting ring 142 is provided at the bottom of the sealing column 14.

[0028] In this embodiment, the gas storage tank 16 always contains gas after it is put into use. The normal lifespan of the gas storage tank 16 is generally much longer than the lifespan of the pressure detection probe 15. Therefore, the pressure detection probe 15 needs to be replaced when its lifespan is reached to prevent inaccurate detection results. In this structure, the pressure detection probe 15 can be replaced by pulling up the sealing rod 14, which prevents gas leakage and provides better protection for the safety of personnel and surrounding property. Furthermore, when disassembling the insertion tube 1 later, simply press down the slider 6, causing the locking block 7 to retract automatically under the lower edge limit of the slide groove A401, allowing the insertion tube 1 to be easily removed. The operation is simple and convenient.

[0029] Example 2

[0030] like Figure 5As shown, the present invention proposes an LNG receiving station tank pressure detection system, which includes a pressure detection module, a gas storage tank 16, a flow detection module and an alarm module, with the pressure detection module installed on the gas storage tank 16.

[0031] The pressure detection module includes a tube 1, a slider 6, and a sealing post 14. A sealing ring 2 is installed on the outside of the tube 1, and a mounting plate 3 is installed at the top of the tube 1. A controller 4 is installed on the mounting plate 3, and the controller 4 is connected to a pressure gauge 5. A sliding groove A101 is provided on the tube 1, located below the sealing ring 2. The slider 6 is slidably disposed inside the tube 1. Two locking blocks 7 are symmetrically and elastically disposed inside the slider 6. The locking blocks 7 on both sides extend out along the inner side of the corresponding sliding groove A101 and are slidably connected to it. An externally threaded tube 8 is rotatably disposed inside the tube 1, passing through the slider 6 and being helically connected to it. A driving component for driving the externally threaded tube 8 to rotate is provided inside the tube 1. The driving component includes a turbine 9 and a worm gear 10. The turbine 9 is sleeved on the outside of the externally threaded tube 8 and fixedly connected to it. The worm gear 10 is disposed inside the tube 1 and rotatably connected to it, with its outer end extending out of the tube 1. The worm gear 10 is meshed with the turbine 9. A sealing column 14 is detachably mounted inside the mounting plate 3. A connector 11 is mounted on the mounting plate 3. The sealing column 14 is located inside the connector 11 and is slidably connected to it. A sealing sleeve 12 is mounted on the top of the sealing column 14, and the sealing sleeve 12 is spirally connected to the connector 11. A connecting wire 13 is detachably mounted on the sealing sleeve 12 and is connected to the controller 4. The sealing column 14 is located inside the external threaded pipe 8 and is sealed to its interior. A pressure detection probe 15 is detachably mounted inside the sealing column 14 and is connected to the controller 4. A groove B141 is provided above the bottom surface of the sealing column 14. The pressure detection probe 15 is located inside the groove B141 and is detachably connected to the sealing column 14. A limiting ring 142 is provided at the bottom of the sealing column 14.

[0032] Both the flow detection module and the pressure detection module are connected to the alarm module via controller 4. The flow detection module includes an outlet pipe 17, flow meter A18, and flow meter B20. The outlet pipe 17 is connected to the output end of the gas storage tank 16, and the output end of the outlet pipe 17 is connected to valve 19. Flow meter A18 and flow meter B20 are located at the input and output ends of valve 19, respectively.

[0033] In this embodiment, flow meter A18, together with flow meter B20, detects the gas supply status of the gas outlet pipe 17. If the gas storage tank 16 is in the gas supply state, the data change detected by the pressure detection probe 15, together with the normal dynamic data fed back by flow meter A18 and flow meter B20, will not trigger an alarm. However, during the gas supply process, if the difference between the values ​​of flow meter A18 and flow meter B20 exceeds the reasonable range, it indicates that there is a gas leak, and the alarm will sound. This structure can help the staff determine whether the leak is caused by the gas storage tank 16 itself or by the gas supply connection structure.

[0034] Example 3

[0035] This invention proposes a pressure detection method based on the LNG receiving station tank pressure detection system described in Embodiment 1 or Embodiment 2, comprising the following steps:

[0036] S1. Install the pressure detection module and insert the tube 1 into the pre-drilled hole of the gas tank 16. During the insertion process, the locking block 7 will first automatically retract and then automatically pop out after entering the gas tank 16. Then, the external threaded tube 8 will be driven to rotate by the driving component, causing the slider 6 to rise. The locking block 7 will be used to clamp and seal the gas tank 16 from the inside with the external sealing ring 2.

[0037] S2. Release the lock on the sealing column 14, pull the sealing column 14 up to the appropriate height, install the pressure detection probe 15, then press down the sealing column 14 and lock it, connect the sealing column 14 to the controller 4 and power on.

[0038] S3. After adding gas to the gas storage tank 16 and sealing it, the pressure detection probe 15 detects the current pressure value in the gas storage tank 16. The pressure value is analyzed and calculated by the controller 4 and then displayed on the pressure gauge 5.

[0039] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A pressure detection system for an LNG receiving terminal tank, characterized in that, It includes a pressure detection module and a gas storage tank (16), with the pressure detection module installed on the gas storage tank (16); The pressure detection module includes a tube (1), a slider (6), and a sealing column (14). A sealing ring (2) is provided on the outside of the tube (1). A mounting plate (3) is provided at the top of the tube (1). A controller (4) is provided on the mounting plate (3). The controller (4) is connected to a pressure gauge (5). A groove A (101) is provided on the tube (1). The groove A (101) is located below the sealing ring (2). The slider (6) is slidably disposed inside the tube (1). Two locking blocks (7) are symmetrically and elastically disposed inside the slider (6). The locking blocks (7) on both sides extend along the inner side of the corresponding side groove A (101) and are slidably connected to it. An external threaded tube (8) is rotatably disposed inside the tube (1). The external threaded tube (8) passes through the slider (6) and is connected to it. The spiral connection is provided, and a drive component for rotating the external threaded tube (8) is provided inside the insertion tube (1); the sealing column (14) is detachably provided inside the mounting plate (3), the sealing column (14) is located inside the external threaded tube (8) and is sealed to its interior, and the pressure detection probe (15) is detachably provided inside the sealing column (14); the mounting plate (3) is provided with a connector (11), the sealing column (14) is located inside the connector (11) and is slidably connected to it, the top of the sealing column (14) is provided with a sealing sleeve (12), and the sealing sleeve (12) is spirally connected to the connector (11); the sealing sleeve (12) is detachably provided with a connecting line (13), and the pressure detection probe (15) is electrically connected to the controller (4) through the connecting line (13).

2. The LNG receiving terminal tank pressure detection system according to claim 1, characterized in that, It also includes a flow detection module and an alarm module. The flow detection module and the pressure detection module are both connected to the alarm module through the controller (4). The flow detection module includes an outlet pipe (17), flow meter A (18) and flow meter B (20). The outlet pipe (17) is connected to the output end of the gas storage tank (16). The output end of the outlet pipe (17) is connected to the valve (19). Flow meter A (18) and flow meter B (20) are located at the input end and output end of the valve (19) respectively.

3. The LNG receiving terminal tank pressure detection system according to claim 1, characterized in that, The driving components include a turbine (9) and a worm (10); the turbine (9) is sleeved on the outside of the external threaded tube (8) and fixedly connected to it, the worm (10) is set inside the insertion tube (1) and rotatably connected to it, and the outer end of the worm (10) extends out of the insertion tube (1), and the worm (10) meshes with the turbine (9).

4. The LNG receiving terminal tank pressure detection system according to claim 1, characterized in that, A groove B (141) is provided above the bottom surface of the sealing column (14). The pressure detection probe (15) is located inside the groove B (141) and is detachably connected to the sealing column (14). A limiting ring (142) is provided at the bottom of the sealing column (14).

5. A detection method for an LNG receiving terminal tank pressure detection system according to any one of claims 1-4, characterized in that, Includes the following steps: S1. Install the pressure detection module and insert the tube (1) into the pre-drilled hole of the gas tank (16). During the insertion process, the clamp (7) will automatically retract first and then automatically pop out after entering the gas tank (16). Then, the external thread tube (8) will be driven to rotate by the drive component, so that the slider (6) will rise. The clamp (7) will be used to clamp and seal from the inside of the gas tank (16) in conjunction with the external sealing ring (2). S2. Release the lock on the sealing column (14), pull the sealing column (14) up to the appropriate height, install the pressure detection probe (15), then press down the sealing column (14) and lock it, connect the sealing column (14) to the controller (4) and power on; S3. After adding gas to the gas storage tank (16) and sealing it, the pressure detection probe (15) detects the current pressure value in the gas storage tank (16). The pressure value is analyzed and calculated by the controller (4) and then displayed on the pressure gauge (5).

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