Pressure-bearing test device for underground concrete lining gas storage cavern of compressed air energy storage power station

Abstract

The invention discloses a pressure-bearing test device for an underground concrete lining gas storage cavern of a compressed air energy storage power station, which belongs to the field of compressed air energy storage and comprises a gas storage bin, a cover plate, a sealing part, a sealing structure, a temperature optical fiber sensor, a pressure sensor and a strain sensor. The gas storage bin is arranged on the surface of the concrete lining, and bolts are annularly arranged on the outer surface of the gas storage bin; a threaded hole is formed in the cover plate; an air inlet pipe is arranged on one side of the sealing part, and a three-way component is arranged on the air inlet pipe; the sealing structure is arranged on the inner side of the concrete lining; and the temperature optical fiber sensor, the pressure sensor and the strain sensor are arranged on the sealing structure. According to the invention, the influence of circular inflation and deflation in the high-pressure gas storage bin on the temperature in the bin body can be monitored, and the concrete lining simulates the underground artificial chamber environment; the deformation rule of the structure under pressure fluctuation can be tested, and meanwhile, the annular lining can also uniformly distribute air pressure, so that the stress concentration phenomenon of the structure is reduced. The device focuses on the deformation process of the concrete lining and provides key mechanical parameters for engineering application.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to a pressure test device for an underground concrete-lined gas storage chamber of a compressed air energy storage power station. Background Art

[0002] Compressed air energy storage is a new technology that uses compressed air as a medium to store excess electrical energy. The working principle is that when the power demand is low, the excess electrical energy is used to drive the compressor to compress the air into the underground gas storage reservoir, and when the power demand is peak, the compressed gas is released to drive the turbine to generate electricity. In this process, no fossil fuels are involved, and it is clean and safe. Artificial lined chambers will become a large-scale energy storage device that will be widely used in the future.

[0003] At present, compressed air energy storage systems mainly include surface steel tanks, artificial caverns, and salt caverns. Large-scale compressed air energy storage systems mainly rely on underground energy storage reservoirs, in which underground rock mass is the main bearing structure, which has higher economic benefits than ground gas storage reservoirs. Underground gas storage facilities can utilize a variety of underground spaces, including salt caverns formed after salt layer leaching, rock-lined caverns, abandoned mines, depleted oil and gas reservoirs, and aquifers. Artificial caverns are flexible in site selection and are less affected by geological conditions, and are gradually becoming the main gas storage method. At present, artificial cavern gas storage reservoirs in China are still under construction, and there is no test device designed for this special stress environment. Therefore, this device is mainly used for indoor compressed air storage mechanical tests to test the air tightness of the sealing structure and the mechanical properties of the concrete lining, so as to obtain the pressure, temperature and deformation characteristics of the warehouse during the filling and discharging process, and provide key experimental data for the related projects of compressed air energy storage artificial caverns. Summary of the invention

[0004] In order to solve the technical problem in the above-mentioned prior art that there is currently no test device designed for this special stress environment for artificial cavern gas storage in China, the present invention provides a pressure test device for an underground concrete-lined gas storage cavern of a compressed air energy storage power station.

[0005] In order to realize the above technical solution, the present invention provides a pressure test device for an underground concrete-lined gas storage chamber of a compressed air energy storage power station, comprising:

[0006] The gas storage bin is arranged on the outer surface of the concrete lining to constrain the concrete lining inside the device, and a number of bolts are arranged around the outer surface of the gas storage bin;

[0007] The cover plate is provided with threaded holes corresponding to the bolts. After the two cover plates pass through the bolts, they are threadedly connected to the gas storage bin through the bolts;

[0008] The sealing part has an air inlet pipe on one side and a three-way component on the upper end of the air inlet pipe;

[0009] Equipped with sealing rubber strip;

[0010] Sealing structure: the sealing structure is arranged inside the concrete lining;

[0011] The temperature optical fiber sensor, the pressure sensor and the strain sensor are arranged on the surface of the sealing structure.

[0012] Furthermore, an outer shell is provided outside the gas storage bin.

[0013] Furthermore, the outer shell is made of a rigid material, and the rigid material includes steel or copper.

[0014] Furthermore, the connection lines of the temperature optical fiber sensor, the pressure sensor and the strain sensor pass through the air intake pipe and are connected to the three-way component at the upper end of the air intake pipe.

[0015] Furthermore, the concrete lining is in the shape of a ring.

[0016] The beneficial effects of the present invention are:

[0017] The present invention proposes a pressure test device for underground concrete-lined gas storage chambers in compressed air energy storage power stations, which can monitor the impact of circulating gas filling and discharging in high-pressure gas storage chambers on the temperature inside the chamber. The concrete lining simulates the environment of an underground artificial chamber, and can test its deformation law under pressure fluctuations. At the same time, the annular lining can also evenly distribute the air pressure and reduce the stress concentration phenomenon of the structure. The device focuses on the deformation process of the concrete lining and provides key mechanical parameters for engineering applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part 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 an improper limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of the overall structure of a pressure test device for an underground concrete-lined gas storage chamber of a compressed air energy storage power station provided by the present invention;

[0020] Figure 2 It is a side view of a pressure test device for an underground concrete-lined gas storage chamber of a compressed air energy storage power station;

[0021] Figure 3 It is the cross-sectional view of section AA;

[0022] Figure 4 It is a schematic diagram of the assembly cover plate of the present invention;

[0023] Figure 5It is a schematic diagram of the sealing part and the air intake duct of the present invention;

[0024] Figure 6 It is a schematic diagram of the concrete lining of the present invention;

[0025] Figure 7 It is a schematic diagram of the sealing structure of the present invention.

[0026] The above drawings include the following reference numerals:

[0027] 1. Cover plate; 11. Threaded hole; 2. Air inlet pipe; 21. Three-way component; 3. Sealing part; 4. Rubber sealing strip; 5. Air storage bin; 51. Bolts; 6. Concrete lining; 7. Sealing structure; 8. Outer shell. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0030] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0031] See also Figures 1 to 7 As shown, the present invention provides a pressure test device for an underground concrete-lined gas storage chamber of a compressed air energy storage power station, comprising:

[0032] The gas storage bin 5 is arranged on the outer surface of the concrete lining 6 to constrain the concrete lining 6 inside the device, and a plurality of bolts 51 are arranged around the outer surface of the gas storage bin 5;

[0033] The cover plate 1 is provided with threaded holes 11 corresponding to the bolts 51. After the two cover plates 1 pass through the bolts 51, they are threadedly connected to the gas storage bin 5 through the bolts 51;

[0034] A sealing part 3, an air inlet pipe 2 is arranged on one side of the sealing part 3, a three-way component 21 is arranged on the upper end of the air inlet pipe 2, and a sealing rubber strip is arranged on the other side of the sealing part 3;

[0035] A sealing structure 7, the sealing structure 7 is arranged inside the concrete lining 6;

[0036] The temperature optical fiber sensor, the pressure sensor and the strain sensor are arranged on the surface of the sealing structure 7 .

[0037] That is to say, when the pressure test device of the compressed air energy storage power station underground concrete lining 6 gas storage cavern provided by the present invention is actually used, hereinafter referred to as the pressure test device, the air inlet pipe 2 of the pressure test device is controlled by the control device to pass or release the test gas into the sealing structure 7, so as to test the air tightness of the sealing structure 7 and the mechanical properties of the concrete lining 6. In addition, during the process of filling and discharging, the pressure, temperature and deformation characteristics inside the pressure test device can be measured by the temperature optical fiber sensor, pressure sensor and strain sensor arranged on the sealing structure 7, and the test results are returned to the control device and the data is recorded in real time, providing key experimental data for the related projects of the compressed air energy storage artificial cavern.

[0038] During this process, the sealing parts 3 arranged on the upper and lower surfaces of the pressure test device can seal and pressurize the gas inside the device; the gas storage bin 5 arranged on the outside of the pressure test device can simulate the underground surrounding rock to constrain the concrete lining 6 inside the device; the air inlet pipe 2 arranged at the center of the sealing part 3 on the pressure test device can be used to inject high-pressure test gas into the cavity; the sealing structure 7 arranged on the inner side of the concrete lining 6 can seal the test gas and transfer the load to the concrete lining 6 at the same time; the concrete lining 6 arranged between the sealing structure 7 and the outer shell 8 is used to bear the load transferred by the sealing structure 7 and transfer the gas pressure.

[0039] As a preferred embodiment, a shell is provided outside the gas storage bin 5 for bearing the load and ensuring the safety of the device.

[0040] As a preferred embodiment, the outer shell 8 is made of a rigid material, and the rigid material includes steel or copper. That is to say, the outer shell 8 acts as a rigid constraint, carries the load transmitted by the concrete lining 6, and ensures the safety of the device during the experiment.

[0041] As a preferred embodiment, the connection lines of the temperature optical fiber sensor, the pressure sensor and the strain sensor pass through the air intake pipe 2 and are connected to the three-way component 21 at the upper end of the air intake pipe 2. That is to say, the air intake pipe 2 can not only serve as the inlet of the high-pressure test gas, but also as the inlet of the lines of the temperature optical fiber sensor, the pressure sensor and the strain sensor. The three-way component 21 used at the upper end of the air intake pipe 2 can connect the temperature optical fiber sensor, the pressure sensor and the strain sensor.

[0042] As a preferred embodiment, the concrete lining 6 is annular. That is to say, the annular concrete lining 6 can be used to bear the air pressure, so that the air pressure is evenly transmitted to the outer shell 8 of the air storage bin 5, thereby reducing the stress concentration effect of the air storage bin 5.

[0043] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0044] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pressure test device for an underground concrete-lined gas storage chamber of a compressed air energy storage power station, characterized in that: include: An air storage bin (5), the air storage bin (5) being arranged on the outer surface of the concrete lining (6) to constrain the concrete lining (6) inside the device, and a plurality of bolts (51) being arranged around the outer surface of the air storage bin (5); A cover plate (1), wherein the cover plate (1) is provided with a threaded hole (11) corresponding to the bolt (51), and after the two cover plates (1) pass through the bolt (51), they are threadedly connected to the gas storage bin (5) through the bolt (51); A sealing portion (3), wherein an air intake pipe (2) is provided on one side of the sealing portion (3), and a three-way component (21) is provided at the upper end of the air intake pipe (2); and a sealing rubber strip is provided on the other side of the sealing portion (3); A sealing structure (7), wherein the sealing structure (7) is arranged inside the concrete lining (6); A temperature optical fiber sensor, a pressure sensor and a strain sensor, wherein the temperature optical fiber sensor, the pressure sensor and the strain sensor are arranged on the surface of the sealing structure (7).

2. The pressure test device for the underground concrete-lined gas storage chamber of a compressed air energy storage power station according to claim 1 is characterized in that: An outer shell (8) is provided outside the gas storage bin (5).

3. The pressure test device for the underground concrete-lined gas storage chamber of the compressed air energy storage power station according to claim 2 is characterized in that: The outer shell (8) is made of a rigid material, and the rigid material includes steel or copper.

4. The pressure test device for the underground concrete-lined gas storage chamber of a compressed air energy storage power station according to claim 1, characterized in that: The connection lines of the temperature optical fiber sensor, the pressure sensor and the strain sensor pass through the air intake pipe (2) and are connected to the three-way component (21) at the upper end of the air intake pipe (2).

5. The pressure test device for the underground concrete-lined gas storage chamber of a compressed air energy storage power station according to any one of claims 1 to 4, characterized in that: The concrete lining (6) is in the shape of a ring.

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