Gas storage chamber steel lining welding seam gas leakage detection device and method

Abstract

The invention relates to the technical field of compressed air energy storage, and particularly discloses a gas storage chamber steel lining welding seam gas leakage detection device and method, and the device comprises a supporting frame which can move up and down, a sealing structure, a hydraulic loading module, an air pressure applying module, and a monitoring module. The supporting frame is used for moving or lifting the sealing structure; the sealing structure comprises an I-shaped steel ring and sealing rubber pads, the sealing rubber pads are fixed to the edge positions of two wing plates of the I-shaped steel ring, two circles of sealing rubber pads are arranged around the two wing plates, and the two circles of sealing rubber pads are matched with a web of the I-shaped steel ring to seal the steel lining weld joint, so that the steel lining weld joint is located in the closed space; a plurality of hydraulic loading modules are arranged along the circumferential direction of the I-shaped steel ring and are used for pressing the hydraulic loading modules; the air pressure applying module is used for applying set air pressure into the closed space; and the monitoring module is used for detecting the air pressure change condition in the closed space.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to a device and method for detecting gas leakage in a steel lining weld of a gas storage chamber. Background Art

[0002] CAES (Compressed Air Energy Storage) technology uses electricity generated during off-peak periods to compress and store air, releasing the compressed air during peak periods to generate electricity. In a CAES system, the air storage chamber is a crucial component for storing compressed air. To ensure the structural tightness of the air storage chamber, an airtightness test is required. When testing the airtightness of the air storage chamber structure, methods such as the gas trace method can often be used. The gas trace method injects an easily detectable gas (such as helium) into the system as a tracer gas, then uses the gas to detect gas leaks around the sealed system. However, for large-scale underground chambers, gas leaks into the surrounding rock formations, making this method ineffective for determining airtightness. The pressure differential method applies a certain pressure differential and monitors the pressure changes inside and outside the system to determine if there are leaks in the system.

[0003] In CAES-lined chambers, the primary sealing function is provided by steel linings and low-permeability concrete linings. When steel plates are spliced, welding is often used to connect them; the presence of the steel lining welds determines the airtightness of the CAES chamber.

[0004] The prior art discloses some methods for conducting physical tests in the laboratory. However, these methods cannot be directly used in actual projects because they involve issues such as on-site installation of sealing devices. Therefore, there is currently a lack of on-site testing and test equipment for testing the permeability of steel lining welds and lining construction joints in actual projects. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a gas storage chamber steel lining weld leakage detection device and method to perform steel lining weld air tightness testing. The device and method can evaluate the leakage points of the steel lining weld and then use them for subsequent maintenance.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions: In a first aspect, the present invention provides a gas storage chamber steel lining weld leakage detection device, comprising a lifting and movable support frame, a sealing structure, a hydraulic loading module, an air pressure application module and a monitoring module; The lifting and movable support frame is used to move or lift the sealing structure; The sealing structure includes an I-shaped steel ring and a sealing rubber pad. The sealing rubber pad is fixed to the edges of the two wing plates of the I-shaped steel ring and is provided with two circles around the two wing plates. The two circles of sealing rubber pad cooperate with the web of the I-shaped steel ring to seal the steel lining weld, so that the steel lining weld is located in a closed space. The hydraulic loading modules are arranged in plurality along the circumferential direction of the I-shaped steel ring to compress the sealing structure; The air pressure applying module is used to apply a set air pressure into the enclosed space; The monitoring module is used to detect changes in air pressure in a confined space.

[0007] As a further technical solution, the I-shaped steel ring is an integral steel ring.

[0008] As a further technical solution, the I-shaped steel ring is a multi-section spliced ​​steel ring.

[0009] As a further technical solution, air injection holes and monitoring holes are reserved on the web of the I-shaped steel ring.

[0010] As a further technical solution, the air pressure application module includes a gas injection steel pipe, a gas storage cylinder, and a gas injection pipe; the gas storage cylinder is connected to the gas injection steel pipe, the gas injection steel pipe is connected to the gas injection pipe, and the gas injection pipe is threadedly connected to the I-shaped steel ring and pre-tightened by a nut.

[0011] As a further technical solution, the monitoring module includes a pressure gauge, a temperature sensor and a data acquisition device. The pressure gauge includes a first pressure gauge for directly measuring the internal pressure of the confined space, and a second pressure gauge and a third pressure gauge installed on the gas injection steel pipe and the gas injection pipe; the first pressure gauge, the second pressure gauge, the third pressure gauge and the temperature sensor are all connected to the data acquisition device.

[0012] As a further technical solution, the temperature sensor is arranged on the gas injection steel pipe or the gas injection pipe.

[0013] As a further technical solution, a plurality of the air pressure applying modules can be provided along the circumferential direction of the I-shaped steel ring.

[0014] In a second aspect, the present invention further provides a detection method based on the above-mentioned gas storage chamber steel lining weld leakage detection device, which is specifically as follows: The sealing structure is placed on a lifting and movable support frame, and the lifting and movable support frame is moved to the position of the steel lining weld seam so that the I-shaped steel ring completely covers the weld seam; A hydraulic loading module, an air pressure application module and a monitoring module are respectively installed on the sealing structure; The hydraulic loading module gradually presses against the I-shaped steel ring, compressing the sealing rubber pad, so that a closed space is formed between the I-shaped steel ring and the steel lining weld; Inject compressed gas into the confined space at a set rate; Holding pressure setting time; Observe the changes in the value of the monitoring module. If the value of the monitoring module gradually decreases, it means that there is gas leakage in the steel lining weld; if the value of the monitoring module remains unchanged within the set time, it means that there is no gas leakage in the steel lining weld.

[0015] As a further technical solution, when the I-shaped steel ring is a segmented steel ring, the lower structure is transported to a position perpendicular to the cross-section of the cavern, and then the upper structure is placed in the position of the lower structure. After being tightened by the hydraulic loading module, the upper and lower structures are connected by sealing gaskets and bolts.

[0016] The beneficial effects of the present invention are as follows: 1. The present invention achieves sealing of the steel lining weld by means of an I-shaped steel ring and a sealing rubber pad. Specifically, the sealing rubber pad is fixed to the edge positions of the two wing plates of the I-shaped steel ring, and two circles are arranged around the two wing plates. The two circles of sealing rubber pad cooperate with the web of the I-shaped steel ring to seal the steel lining weld, so that the steel lining weld is located in a confined space, which is convenient for the subsequent air pressure application test. The sealing device proposed in the present invention has a simple structure and can achieve a relatively good sealing effect. In addition, the I-shaped steel ring and the sealing rubber pad can cooperate with a lifting and movable support frame to realize the sealing detection of each steel lining weld in the entire gas storage chamber.

[0017] 2. In order to realize the installation of the air pressure applying module, the present invention reserves an air injection hole on the I-shaped steel ring in advance. The air injection pipe can be fixed in the air injection hole in advance. When injecting air, it is only necessary to directly connect the air injection pipe to the air pressure applying module. The whole process is simple and convenient to operate.

[0018] 3. The pressure gauges in the monitoring module of the present invention include a first pressure gauge that directly measures the internal pressure of the enclosed space, and a second pressure gauge and a third pressure gauge installed on the gas injection steel pipe and the gas injection pipe. By comparing the numerical changes of the first pressure gauge and the second pressure gauge and the third pressure gauge, the result of whether the steel lining weld is leaking can be directly obtained; it has the advantages of high detection efficiency and accuracy, simple operation, and easy portability. It can quickly and comprehensively evaluate the gas sealing and permeability of steel plate welds and lining construction joints, reducing safety hazards caused by leakage problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] Figure 1 This is a main structural diagram of the gas storage chamber steel lining weld gas leakage detection device proposed by the present invention; Figure 2 It is a cross-sectional view of the gas storage chamber steel lining weld leakage detection device proposed by the present invention in an uncompressed state; Figure 3 This is a cross-sectional view of the gas storage chamber steel lining weld leakage detection device proposed by the present invention in a compressed state; Figure 4 It is a cross-sectional view of the gas storage chamber steel lining weld leakage detection device proposed by the present invention when it moves to the next weld to be detected; Figure 5 This is a structural diagram of a gas storage chamber steel lining weld gas leakage detection device that can be assembled in sections; Figure 6 This is a cross-sectional view of the non-assembled portion of the main structure of the I-shaped steel ring; Figure 7 This is a cross-sectional view of the assembly of the main structure of the I-shaped steel ring; In the figure: 1. Surrounding rock; 2. Lining; 3. Steel lining; 4. Sealing rubber pad; 5. I-shaped steel ring; 6. Confined space; 7. Gas injection pipe; 8. Hydraulic cylinder; 9. Hydraulic station; 10. High-pressure oil pipe; 11. First pressure gauge; 12. Nut; 13. Second pressure gauge; 14. First temperature sensor; 15. Control valve; 16. Gas injection steel pipe; 17. Steel lining weld; 18. Tire; 19. Liftable and movable support frame; 20. Cylinder trolley; 21. Gas storage cylinder; 22. Second temperature sensor; 23. Flow meter; 24. Third pressure gauge; 25. Bolt; 26. Rubber pad; 27. Lower structure; 28. Upper structure; 29. ​​Reserved bolt holes. DETAILED DESCRIPTION

[0021] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise clearly indicated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprising" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations; In order to solve the technical problems existing in the prior art, this embodiment provides a gas storage chamber steel lining weld seam gas leakage detection device and detection method, wherein the gas storage chamber steel lining weld seam gas leakage detection device Figure 1 、 Figure 2 、 Figure 3 As shown, it includes a main structure, a hydraulic loading module, and an air pressure application and monitoring module; Among them, the main structure includes an I-shaped steel ring 5 with a reserved threaded hole, a sealing rubber pad 4, a cylinder fixing frame, and a lifting and movable support frame 19. The I-shaped steel ring 5 is set on the lifting and movable support frame 19. The lifting and movable support frame 19 is used to move and lift the I-shaped steel ring 5 to a specified position, and the sealing rubber pad 4 is fixed to the outer ring of the I-shaped steel ring 5 to seal the weld on the steel lining 3. The outer layer of the steel lining 3 is the lining 2, and the outer layer of the lining 2 is the surrounding rock 1; the cylinder fixing frame is mainly used to fix the hydraulic cylinder 8; further, the I-shaped steel ring 5 includes two wing plates and a web plate. A sealing rubber gasket 4 is arranged along the edges of the two wing plates to form two circles of sealing rubber gaskets 4. The two circles of sealing rubber gaskets 4 cooperate with the web plate to seal the steel lining weld 17, so that the steel lining weld 17 is located in a closed space 6, and then a subsequent sealing test experiment is carried out. At the same time, air injection holes and monitoring holes are provided on the web plate. The air injection holes are used to inject compressed gas into the closed space 6, and the monitoring holes are used to monitor the air pressure. The air injection holes and monitoring holes are arranged on the web plate instead of the wing plate to ensure the strength of the I-shaped steel ring 5.

[0023] Furthermore, the hydraulic loading module includes a hydraulic cylinder 8, a high-pressure oil pipe 10 and a hydraulic station 9. The hydraulic cylinder 8 is connected to the hydraulic station 9 through the high-pressure oil pipe 10. Multiple hydraulic cylinders 8 are arranged along the circumferential direction of the I-shaped steel ring 5; the hydraulic loading module is used to compress the I-shaped steel ring 5 and the sealing rubber pad 4.

[0024] Furthermore, the air pressure application and monitoring module includes a gas cylinder 21 with a high-pressure reducing valve, a cylinder trolley 20, an air injection pipe 7, a nut 12, an air injection steel pipe 16, a control valve 15, multiple pressure gauges, multiple temperature sensors, a flow meter 23 and a sensor collection box; the gas cylinder 21 with a high-pressure reducing valve is installed on the cylinder trolley 20, and the gas cylinder 21 is connected to a section of the air injection pipe 7 through the air injection steel pipe 16, and the air injection pipe 7 is threaded or welded to the reserved air injection hole on the I-shaped steel ring 5; and is pre-tightened by the nut 12; a control valve 15, multiple pressure gauges, multiple temperature sensors, a flow meter 23, etc. are provided on the air injection steel pipe 16; specifically, in this embodiment, it includes a second air pressure gauge 13, a third air pressure gauge 24, a first temperature sensor 14, and a second temperature sensor 22.

[0025] Furthermore, a first barometer 11 is provided, and the pressures measured by the first barometer 11, the second barometer 13 and the third barometer 24 verify each other; after the pressures displayed by the first barometer 11, the second barometer 13 and the third barometer 24 reach the design pressure, the control valve 15 is closed.

[0026] Furthermore, the I-shaped steel ring 5 in this embodiment can be selected as an integral type or a segmented assembly type according to actual needs, and the segmented assembly type can be divided into two to four sections. Figure 5 、 Figure 6 、 Figure 7 The diagram shows the upper and lower structures. A rubber pad 26 is set between the two structures, which are spliced ​​with bolts. The purpose of the segmented assembly structure is to improve the deformation capacity of the main structure. For the segmented structure, the lower half structure 27 is first transported to a position perpendicular to the cross section of the cavern, and then the upper half structure 28 is placed in the position of the lower half structure 27. Reserved bolt holes 29 are set on the lower half structure 27 and the upper half structure 28. The reserved bolt holes 29 are connected to the bolts 25 through the rubber pad 26; then the structure is rotated until the segmented assembled I-shaped steel ring 5 is parallel to the cross section of the cavern.

[0027] Furthermore, the layout positions of the hydraulic cylinders 8 in the integral and segmented assembled I-shaped steel rings 5 ​​are different, and the distribution positions of the hydraulic cylinders 8 in the segmented assembled I-shaped steel ring 5 avoid the splicing positions.

[0028] Furthermore, gas injection holes and monitoring holes are reserved on the webs of the integral and segmented assembled I-shaped steel rings 5. The positions of the reserved gas injection holes and monitoring holes can be the same or different, and for the convenience of construction, the gas injection pipe 7 can be fixed in advance at the gas injection hole positions. When injecting gas, it is only necessary to connect the gas injection steel pipe 16 to the gas injection pipe 7; similarly, the monitoring holes can also be welded with monitoring pipes in advance; the gas injection pipe 7 can also be welded to the webs of the I-shaped steel ring 5 in advance, that is, before the I-shaped steel ring 5 is installed, the gas injection pipe 7 and the monitoring pipe are welded thereon.

[0029] Furthermore, based on the above-mentioned gas storage chamber steel lining weld gas leakage detection device, this embodiment also provides a gas storage chamber steel lining weld gas leakage detection device detection method, comprising the following steps: In the existing gas storage chamber, lining 2 and steel lining sealing layer have been installed inside the rock body; Figure 2 As shown, first lower the movable support frame 19 to make the tire 18 touch the ground, and drive the main device to the position of the steel lining weld 17 to be tested, so that the I-shaped steel ring 5 completely covers the weld (as shown in FIG. Figure 3 (As shown). The hydraulic loading module, air pressure application module, and monitoring module are installed on the main structure of the device. During the installation of the hydraulic loading module, the hydraulic cylinder 8 is fixed to the cylinder mounting bracket and connected to the hydraulic station 9 via a high-pressure oil pipe 10.

[0030] During the installation of the air pressure application and monitoring module, wrap the air injection pipe 7 and the connecting pipe of the first air pressure gauge 11 with raw tape and screw them onto the I-shaped steel ring 5. Tighten the nuts 12 on the inside and outside of the steel ring and apply thread lock glue. The I-shaped steel ring 5 can be equipped with multiple threaded holes as needed for installing temperature sensors, air pressure gauges, or air injection pipes 7. Only one threaded hole for air injection is shown in the diagram.

[0031] Components such as the control valve 15, second barometer 13, third barometer 24, first temperature sensor 14, second temperature sensor 22, and flowmeter 23 are connected via a gas injection steel pipe 16 and then to a gas storage cylinder 21. The various sensors are connected to the sensor collection box. The gas injection steel pipe 16 is connected to the gas injection pipe 7 via a conversion joint.

[0032] The liftable support frame 19 and tire 18 are retracted, and under the action of the hydraulic station 9, the hydraulic cylinders 8 in different directions gradually press toward the I-shaped steel ring 5 and tighten the sealing rubber pad 4, so that a closed space 6 is formed between the I-shaped steel ring 5 and the steel lining weld 17.

[0033] During the test, the control valve 15 of the gas cylinder 21 is opened, and the gas in the cylinder is released by adjusting the high-pressure pressure reducing valve (with a range of 16 MPa). The output pressure of the high-pressure pressure reducing valve is adjusted to 2-4 MPa. After the third pressure gauge 24, second temperature sensor 22, and flowmeter 23 connected to the gas injection pipe 16 generate data, the control valve 15 is opened and adjusted to inject compressed air or other gas into the confined space 6 at a constant rate. After the pressure indicated by the first and second pressure gauges 11 and 13 reaches the design pressure, the control valve 15 is closed and the pressure is maintained for 30 minutes. The changes in the sensor data over time are recorded during the process. If gas leaks from the steel lining weld 17, the pressure and temperature inside the confined space 6 will gradually decrease. By comparing the pressure-time curves displayed by the first and second pressure gauges 11 and 13, and the temperature-time curves displayed by the first and second temperature sensors 14 and 22, the sealing performance of the confined space 6 can be analyzed.

[0034] After the sealing test of the lining 2 in this area is completed and there is no air leakage, the movable support frame 19 and tire 18 are lowered to continue testing the air tightness of the next round of welds. Figure 4 This is a cross-sectional view of the gas storage chamber steel lining weld leak detection device as it moves to the next weld to be tested, and so on. If a pressure drop in that area causes a leak, additional steel plate is added at the weld location and installed by welding. After installation, the device is continued to be used for leak detection according to the above steps. The output pressure of the high-pressure reducing valve should be adjusted to 10 MPa, and the pressure holding time should be increased to 1 hour.

[0035] Furthermore, if the I-shaped steel ring 5 adopts a segmented steel ring, the lower half structure 27 is first transported to a position perpendicular to the cross section of the cavern, and then the upper half structure 28 is placed in the position of the lower half structure 27, and connected with the bolts 25 through the sealing gasket; then the structure is rotated until the segmented assembled I-shaped steel ring 5 is parallel to the cross section of the cavern.

[0036] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A gas storage chamber steel lining weld leakage detection device, characterized in that: It includes a lifting and movable support frame, a sealing structure, a hydraulic loading module, an air pressure application module and a monitoring module; The lifting and movable support frame is used to move or lift the sealing structure; The sealing structure includes an I-shaped steel ring and a sealing rubber pad. The sealing rubber pad is fixed to the edges of the two wing plates of the I-shaped steel ring and is provided with two circles around the two wing plates. The two circles of sealing rubber pad cooperate with the web of the I-shaped steel ring to seal the steel lining weld, so that the steel lining weld is located in a closed space. The hydraulic loading modules are arranged in plurality along the circumferential direction of the I-shaped steel ring to compress the sealing structure; The air pressure applying module is used to apply a set air pressure into the enclosed space; The monitoring module is used to detect changes in air pressure in a confined space.

2. The gas storage chamber steel lining weld leakage detection device according to claim 1, characterized in that: The I-shaped steel ring is an integral steel ring.

3. The gas storage chamber steel lining weld leakage detection device according to claim 1, characterized in that: The I-shaped steel ring is a multi-section spliced ​​steel ring.

4. The gas storage chamber steel lining weld leakage detection device according to claim 1, characterized in that: Air injection holes and monitoring holes are reserved on the web of the I-shaped steel ring.

5. The gas storage chamber steel lining weld leakage detection device according to claim 1, characterized in that: The air pressure application module includes a gas injection steel pipe, a gas storage cylinder, and a gas injection pipe; the gas storage cylinder is connected to the gas injection steel pipe, the gas injection steel pipe is connected to the gas injection pipe, and the gas injection pipe is threadedly connected to the I-shaped steel ring and pre-tightened by a nut.

6. The gas storage chamber steel lining weld leakage detection device according to claim 5, characterized in that: The monitoring module includes a pressure gauge, a temperature sensor and a data acquisition device. The pressure gauge includes a first pressure gauge that directly measures the internal pressure of the confined space, and a second pressure gauge and a third pressure gauge installed on the gas injection steel pipe and the gas injection pipe; the first pressure gauge, the second pressure gauge, the third pressure gauge and the temperature sensor are all connected to the data acquisition device.

7. The gas storage chamber steel lining weld leakage detection device according to claim 6, characterized in that: The temperature sensor is arranged on the gas injection steel pipe or the gas injection pipe.

8. The gas storage chamber steel lining weld leakage detection device according to claim 1, characterized in that: The air pressure applying modules are arranged in plurality along the circumferential direction of the I-shaped steel ring.

9. A detection method for detecting gas leakage in a gas storage chamber steel lining weld according to any one of claims 1 to 8, characterized in that: The details are as follows: The sealing structure is placed on a lifting and movable support frame, and the lifting and movable support frame is moved to the position of the steel lining weld seam so that the I-shaped steel ring completely covers the weld seam; A hydraulic loading module, an air pressure application module and a monitoring module are respectively installed on the sealing structure; The hydraulic loading module gradually presses against the I-shaped steel ring, compressing the sealing rubber pad, so that a closed space is formed between the I-shaped steel ring and the steel lining weld; Inject compressed gas into the confined space at a set rate; Holding pressure setting time; Observe the changes in the value of the monitoring module. If the value of the monitoring module gradually decreases, it means that there is gas leakage in the steel lining weld; if the value of the monitoring module remains unchanged within the set time, it means that there is no gas leakage in the steel lining weld.

10. The detection method of the gas storage chamber steel lining weld leakage detection device according to claim 9, characterized in that: When the I-shaped steel ring is a segmented steel ring, the lower structure is transported to a position perpendicular to the cross section of the cavern, and then the upper structure is placed in the position of the lower structure. After being tightened by the hydraulic loading module, the upper and lower structures are connected with sealing gaskets and bolts.

Images