Assembly type compressed air energy storage underground gas storage chamber structure with adjustable circumferential stress

Abstract

The invention discloses an assembly type compressed air energy storage underground gas storage chamber structure with adjustable circumferential stress, which comprises a gas storage chamber main body, a strain monitoring mechanism and a pressing mechanism, and is characterized in that the gas storage chamber main body comprises a plurality of lining units, and the plurality of lining units can be spliced into a cylindrical structure for gas storage; the pressing mechanism comprises a plurality of pressing ribs and a tensioning mechanism; and the pressing ribs are used for binding all the lining unit main bodies. The lining unit has the beneficial effects that the prestressed tendons are in a tensioned state and are fixedly embedded in the first hole channels formed in the lining unit body, so that the overall strength and stability of the lining unit are enhanced, and the anti-cracking performance of the lining unit is improved; in addition, the pressing force between the lining units is dynamically adjusted according to the stress, the pressure fluctuation of the filling material in the inflation and deflation period is effectively balanced and relieved, the durability is remarkably improved, and the service life is remarkably prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to an assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress. Background Art

[0002] Compressed air energy storage is a new technology that uses compressed air as a medium to store surplus electric energy. Its main function is to reduce peak loads and fill valleys and improve the quality of electricity. Its working principle is to use the excess electric energy in the power grid to drive the air compressor during the low power consumption period, compress the air to a high pressure state and store it in the underground cavern; at the peak of power consumption, the high-pressure air is released and mixed with a small amount of gas fuel, and then burned and expanded in the gas turbine to drive the generator to generate electricity. As an important part of the compressed air energy storage power station, the underground gas storage is the key technology to ensure its operating performance and reliability. At present, the geological structures of underground gas storage suitable for compressed air energy storage are mainly divided into three categories: ① artificially dissolved salt rock cavity; ② porous medium rock in aquifer; ③ artificially excavated underground caverns in hard rock. Since the first two methods require relatively special geological conditions, in areas with rich wind resources but no special geological structures, artificially excavated underground chambers in hard rock have become the most feasible underground gas storage solutions.

[0003] Generally speaking, the lining and sealing layer of gas storage are the key to the stability and sealing of gas storage. In existing research, underground gas storage lining mainly includes two forms: integral cast-in-place type and piecewise assembly type.

[0004] The integral cast-in-place lining is widely used due to its mature technology and strong integrity. However, under the action of high-pressure alternating loads and temperature loads, the integral cast-in-place lining is prone to cracks, with a large number of cracks and a large width. Although the lining is allowed to work with cracks, the cracks in the lining usually do not affect the stability of the gas storage reservoir, but too many or too wide cracks can easily lead to failure of the sealing layer. For example, the flexible sealing layer is easily squeezed into the cracks under the action of high internal pressure, resulting in local damage or even rupture of the sealing layer. In addition, the generation of cracks can easily cause local stress concentration in the sealing layer. Under the action of high-pressure alternating loads and temperature loads, the fatigue damage of the sealing layer is further aggravated, causing plastic deformation and local buckling failure of the sealing layer, which in turn leads to failure of the sealing layer.

[0005] Segmented prefabricated lining has become another common choice due to its advantages of high construction efficiency and short construction period. Segmented prefabricated lining is assembled from multiple prefabricated lining units, and each unit is connected by filling materials or other connecting devices. The pre-seam design alleviates the stress concentration problem caused by high-pressure alternating loads and temperature loads of the integral cast-in-place lining to a certain extent, and reduces the cracking of the lining units. However, segmented prefabricated lining still has many problems. First of all, under the action of high-pressure alternating loads and temperature loads, the segmented lining only reduces the cracking of the lining units, but cracks are still difficult to avoid.

[0006] In addition, during the operation of the compressed air energy storage underground gas storage chamber, it is necessary to undergo frequent inflation and deflation cycles, which causes the circumferential stress of the lining unit in the gas storage chamber to fluctuate periodically. In the current technology, after each lining unit is compressed and fixed by a clamping device, its compression force is maintained at a fixed value, and it lacks the ability to adaptively adjust according to the pressure changes inside the gas storage chamber. Specifically, when the pressure inside the gas storage chamber is at a high level, the high-pressure environment can effectively offset most of the compression force, so that the pressure on the filling material between adjacent lining units is relatively small; however, when the pressure inside the gas storage chamber drops to a low level, the low-pressure environment can only offset a small part of the compression force, resulting in a significant increase in the pressure on the filling material. Therefore, during the periodic changes of inflation and deflation of the gas storage chamber, the pressure experienced by the filling material fluctuates violently, which seriously weakens its durability. Summary of the invention

[0007] The purpose of the present invention is to overcome the above-mentioned technical deficiencies and propose an assembled compressed air energy storage underground gas storage chamber structure with adjustable annular stress, so as to solve the technical problems in the prior art that the segmented assembled lining is prone to cracks under high-pressure alternating loads and temperature loads, and the durability of the filling material is low.

[0008] In order to achieve the above technical objectives, the present invention adopts the following technical solutions:

[0009] The present invention provides an assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress, comprising:

[0010] Compared with the prior art, the beneficial effect of the assembled compressed air energy storage underground gas storage chamber structure with adjustable circumferential stress provided by the present invention is that when in use, multiple lining units are assembled to form a cylindrical structure for gas storage. Each lining unit includes a lining unit body and a plurality of prestressed tendons. The prestressed tendons are in a tensioned state and are respectively fixedly embedded in the first channels opened in the lining unit body to enhance the overall strength and stability of the lining unit, thereby providing its crack resistance. At the same time, the strain gauge can measure the strain of the lining unit body along the circumference of the cylindrical structure in real time, that is, monitor the circumferential deformation of the gas storage chamber body caused by gas pressure during the gas storage process. When the strain monitoring mechanism detects that the strain of the lining unit body has changed, the tensioning mechanism will adjust the tension of the compression tendons according to the change in the strain. If the strain increases, it means that the main body of the gas storage chamber is subjected to greater annular pressure. At this time, the tensioning mechanism will increase the tension of the compression ribs to resist this pressure; conversely, if the strain decreases, the tensioning mechanism will reduce the tension of the compression ribs. Through this adjustment mechanism, the compression force between the lining units can be dynamically adjusted according to the strain of the main body of the lining unit along the circumference of the cylindrical structure, effectively balancing and reducing the pressure fluctuations of the filling material during the inflation and deflation cycle, significantly improving its durability and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of an assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress provided by one embodiment of the present invention;

[0012] Figure 2 yes Figure 1 A schematic diagram of the structure of a lining unit;

[0013] Figure 3 yes Figure 1 A schematic diagram of the structure of a lining unit with a cable inlet and a cable outlet;

[0014] Figure 4 yes Figure 1 A schematic diagram of the structure of the clamping mechanism in FIG.

[0015] Figure 5 yes Figure 4 A partial enlarged view of the middle area A;

[0016] Figure 6 The pressure distribution of the gas storage chamber body at various locations on the ring is calculated using the numerical simulation method;

[0017] Description of the accompanying drawings: 1-gas storage chamber body, 11-lining unit, 111-lining unit body, 1111-first channel, 1112-inlet hole, 1113-outlet hole, 1114-second channel, 1115-detection groove, 112-prestressed tendon, 12-filling material, 13-sliding layer, 14-sealing layer, 15-buffer layer, 151-drainage hole, 2-strain monitoring mechanism, 21-strain gauge, 3-compression Mechanism, 31-compression ribs, 311-anchor, 32-tensioning mechanism, 321-compression plate, 322-protective plate, 323-mounting plate, 324-screw, 3241-first bearing, 3242-second bearing, 325-rotational driving member, 3251-rotational driving motor, 3252-driving pulley, 3253-driven pulley, 3254-synchronous belt, 326-fixed block, 327-containment shell, 4-surrounding rock. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0019] In order to solve the technical problems in the prior art that the segmented assembled lining is prone to cracks under high-pressure alternating loads and temperature loads, and the durability of the filling material is low, the present invention provides an assembled compressed air energy storage underground gas storage chamber structure with adjustable annular stress, which can increase the crack resistance of the segmented assembled lining, and at the same time can dynamically adjust the compression force between the lining units according to the internal pressure of the gas storage chamber, thereby effectively balancing and reducing the pressure fluctuation of the filling material during the inflation and deflation cycle, and significantly improving its durability and service life.

[0020] See also Figure 1 and Figure 4 , Figure 1 This is a structural schematic diagram of an assembled compressed air energy storage underground gas storage chamber structure with adjustable annular stress in one embodiment of the present invention. The assembled compressed air energy storage underground gas storage chamber structure with adjustable annular stress includes an gas storage chamber body 1, a strain monitoring mechanism 2 and a clamping mechanism 3.

[0021] The gas storage chamber main body 1 includes a plurality of lining units 11, and a plurality of the lining units 11 can be assembled into a cylindrical structure for storing gas. Each of the lining units 11 includes a lining unit main body 111 and a plurality of prestressed tendons 112. A plurality of first channels 1111 extending circumferentially around the cylindrical structure are provided in the lining unit main body 111. Each of the prestressed tendons 112 is in a tensioned state and is fixedly embedded in a corresponding first channel 1111.

[0022] The strain monitoring mechanism 2 includes a plurality of strain gauges 21 , each of which is arranged on the inner wall of the lining unit body 111 and is used to measure the strain amount of the lining unit body 111 along the circumferential direction of the cylindrical structure.

[0023] The clamping mechanism 3 includes a plurality of clamping ribs 31 and a tensioning mechanism 32; the clamping ribs 31 are used to bind each of the lining unit bodies 111 so that each of the lining unit bodies 111 remains in the cylindrical structure; the tensioning mechanism 32 is connected to both ends of the clamping ribs 31 and can drive both ends of the clamping ribs 31 to move so as to adjust the tension of each clamping rib 31 according to the circumferential strain of the lining unit body 111 along the cylindrical structure.

[0024] When in use, multiple lining units 11 are assembled to form a cylindrical structure for gas storage. Each lining unit 11 includes a lining unit body 111 and a plurality of prestressed tendons 112. The prestressed tendons 112 are in a tensioned state and are respectively fixedly embedded in the first channels 1111 opened in the lining unit body 111 to enhance the overall strength and stability of the lining unit 11, thereby providing its crack resistance. At the same time, the strain gauge 21 can measure the strain of the lining unit body 111 along the circumference of the cylindrical structure in real time, that is, monitor the circumferential deformation of the gas storage chamber body 1 caused by gas pressure during the gas storage process. When the strain monitoring mechanism 2 detects that the strain of the lining unit body 111 has changed, the tensioning mechanism 32 will adjust the tension of the compression rib 31 according to the change in the strain. If the strain increases, it means that the gas storage chamber body 1 is subjected to a greater annular pressure. At this time, the tensioning mechanism 32 will increase the tension of the compression rib 31 to resist this pressure; conversely, if the strain decreases, the tensioning mechanism 32 will reduce the tension of the compression rib 31. Through this adjustment mechanism, the compression force between the lining units can be dynamically adjusted according to the strain of the lining unit body 111 along the circumference of the cylindrical structure, thereby effectively balancing and reducing the pressure fluctuation of the filling material during the inflation and deflation cycle, and significantly improving its durability and service life.

[0025] In addition, since the prestress of each lining unit can be applied separately and does not affect each other, the prestress value can be flexibly designed and adjusted according to the actual stress conditions of the lining unit, thereby achieving precise control of the prestress size and further optimizing the stress performance of the lining unit. Specifically, the prestress value of the prestressed tendons 112 in each lining unit can be determined by the following steps:

[0026] (1) Obtain the engineering parameters of the underground gas storage chamber and use numerical simulation methods to obtain the pressure at each lining unit (e.g. Figure 6 );

[0027] (2) According to the pressure at the location of each lining unit, the prestress value of the prestressed tendons 112 in each lining unit is determined, and the magnitude of the pressure is proportional to the magnitude of the prestress value.

[0028] In one embodiment, see Figure 1-Figure 3 , an outer wall of one of the lining unit bodies 111 is provided with an inlet hole 1112 and an outlet hole 1113. One end of the inlet hole 1112 is located on the outer wall of the lining unit body 111, and the other end is located at one end of the lining unit body 111; one end of the outlet hole 1113 is located on the outer wall of the lining unit body 111, and the other end is located at the other end of the lining unit body 111. A second channel 1114 extending around the circumference of the cylindrical structure is also provided in each of the other lining unit bodies 111. The compression rib 31 enters the interior of the lining unit body 111 through the inlet hole 1112, and then passes through the second channels 1114 of other lining unit bodies 111 in sequence, and then extends out from the outlet hole 1113 of the lining unit body 111. By inserting the compression rib 31 into each lining unit body 111 , the tightness of the combination between the compression rib 31 and each lining unit body 111 can be improved. At the same time, each second channel 1114 can also limit the compression rib 31 to improve the stability of the compression rib 31 .

[0029] In one embodiment, see Figure 1-Figure 4 The tensioning mechanism 32 includes a clamping plate 321, two protective plates 322, a mounting plate 323, two screws 324 and a rotating driving member 325. The clamping plate 321 is fixedly connected to the two ends of the clamping rib 31. In this embodiment, the clamping plate 321 is fixedly connected to the two ends of the clamping rib 31 via two anchors 311. Two parallel screw holes are provided on the clamping plate 321. One ends of the two protective plates 322 are fixed to the lining unit body 111 having an inlet hole 1112 and an outlet hole 1113. The two ends of the mounting plate 323 are fixed to the other ends of the two protective plates 322. One ends of the two screws 324 are rotatably set on the two protective plates 322, and the other ends of the two screws 324 are rotatably set on the mounting plate 323. The two screws 324 are rotatably inserted into the two screw holes. The rotation driving member 325 is connected to the two screw rods 324 and is used to drive the two screw rods 324 to rotate synchronously.

[0030] During use, when the tension of the compression rib 31 needs to be adjusted, the rotating drive member 325 is started, and the rotating drive member 325 synchronously drives the two screws 324 to rotate. When the two screws 324 rotate, they act on the compression plate 321. Since the compression plate 321 cannot rotate, the rotation of the two screws 324 can be converted into a translational movement of the compression plate 321. The compression plate 321 drives the two ends of the compression rib 31 to move closer to or away from the lining unit body 111. When close to the lining unit body 111, the pressure of the compression rib 31 decreases, and when away from the lining unit body 111, the pressure of the compression rib 31 increases.

[0031] In one embodiment, see Figure 1-Figure 4 The tensioning mechanism 32 further includes two fixing blocks 326, and the two fixing blocks 326 are respectively fixed on the two protection plates 322. One end of the two screw rods 324 is rotatably disposed in the two fixing blocks 326, respectively, to provide stable support for the rotation of the screw rods 324.

[0032] In one embodiment, see Figure 1-Figure 4 The tensioning mechanism 32 further includes a first bearing 3241 and a second bearing 3242. The inner ring of the first bearing 3241 is fixedly sleeved on the screw rod 324, and the outer ring of the first bearing 3241 is fixedly connected to the fixing block 326. The inner ring of the second bearing 3242 is fixedly sleeved on the screw rod 324, and the outer ring of the second bearing 3242 is fixedly connected to the mounting plate 323. The provision of the first bearing 3241 and the second bearing 3242 reduces the friction resistance when the screw rod 324 rotates, and improves the efficiency and stability of the tensioning mechanism 32.

[0033] In one embodiment, see Figure 1-Figure 5 The rotating driving member 325 includes a rotating driving motor 3251, two driving pulleys 3252, two driven pulleys 3253 and two synchronous belts 3254. The housing of the rotating driving motor 3251 is fixed to the mounting plate 323. The two driving pulleys 3252 are coaxially fixed to the output shaft of the rotating driving motor 3251. The two driven pulleys 3253 are coaxially fixed to the two screw rods 324 respectively. One end of the two synchronous belts 3254 is respectively wound around the two driving pulleys 3252, and the other end of the two synchronous belts 3254 is respectively wound around the two driven pulleys 3253. The rotating driving motor 3251 drives the two screw rods 324 to rotate synchronously through the driving pulley 3252, the driven pulley 3253 and the synchronous belt 3254, thereby realizing the adjustment of the tension of the compression rib 31.

[0034] In one embodiment, see Figure 1-Figure 5The tensioning mechanism 32 further includes a housing shell 327. The housing shell 327 is fixed to the mounting plate 323, and a through hole is formed on the housing shell 327. The housing of the rotation driving motor 3251 is fixed in the housing shell 327, and the output shaft of the rotation driving motor 3251 passes through the through hole and extends out of the housing shell 327. The output shaft of the rotation driving motor 3251 is rotatably disposed in the through hole, and the housing shell 327 provides protection for the rotation driving motor 3251 to prevent it from being disturbed and damaged by the external environment.

[0035] In one embodiment, see Figure 1-Figure 4 A detection groove 1115 is provided on the inner side wall of the lining unit body 111. The strain gauge 21 is fitted into the detection groove 1115 to measure the strain amount of the lining unit body 111 along the circumferential direction of the cylindrical structure.

[0036] In one embodiment, see Figure 1 The gas storage chamber body 1 further includes a plurality of fillers 12. The fillers 12 are embedded between two adjacent lining unit bodies 111 to improve the sealing performance of the connection between the two adjacent lining unit bodies 111.

[0037] In one embodiment, see Figure 1 The gas storage chamber body 1 also includes two plugs, which are respectively fixed to the two ends of the cylindrical structure to close the inner cavity of the cylindrical structure. One of the plugs is provided with a vent hole for connecting an external gas injection and extraction device.

[0038] In one embodiment, see Figure 1 The gas storage chamber body 1 also includes a sliding layer 13, a sealing layer 14 and a buffer layer 15. The sliding layer 13 is arranged on the inner wall of the lining unit body 111 to reduce the friction between the lining and the sealing layer 14. The sealing layer 14 is arranged on the inner wall of the sliding layer 13 to prevent gas leakage. The buffer layer 15 is arranged between the outer wall of the concrete lining and the surrounding rock 4 to absorb and disperse the pressure of the surrounding rock on the lining. The buffer layer 15 is provided with a drainage hole 151 to drain seepage water such as groundwater.

[0039] In one embodiment, see Figure 1 The thickness of the sealing layer 14 at the connection of each two adjacent lining unit bodies 111 is greater than the thickness at other positions. The sealing layer 14 is made of a flexible filling material, and by locally thickening the sealing layer 14, the durability of the sealing layer is enhanced and the construction cost of the gas storage is reduced.

[0040] In order to better understand the present invention, the implementation process of the technical solution of the present invention is described in detail below:

[0041] Step 1: Design of segmented prestressed lining energy storage chamber

[0042] According to the geological structure, surrounding rock characteristics, operating pressure, designed burial depth, injection rate, injection frequency, etc. of the energy storage chamber, it is analyzed and judged whether to use segmented prestressed lining. If so, parameter design is carried out, including lining concrete grade, spacing, diameter, strength grade and tension size of the annular prestressed tendons of the lining unit, segment position of the lining unit, number of segments, lining unit form, filling material selection, sealing structure form, monitoring structure form, etc.

[0043] Step 2: Excavation and treatment of surrounding rock

[0044] This step is divided into two categories: existing underground chambers and newly excavated underground chambers. For existing underground chambers, surrounding rock reinforcement and surface treatment are required to make them meet the requirements of strength, stability and cross-sectional shape. For newly excavated underground chambers, standardized construction is carried out according to the designed cross-sectional shape, and support is provided as the excavation progresses.

[0045] Step 3: Buffer layer construction

[0046] The construction quality of the inner wall of the buffer layer is controlled according to the standard design section size. Construction methods such as mesh spraying and formwork cast-in-place can be used. It is required to have certain structural strength, toughness and sealing performance. The cavity gap between the buffer layer and the lining sheet can be filled with grouting behind the wall to ensure direct fit and load transfer between the two.

[0047] Step 4: Prefabrication of lining units

[0048] The lining unit is prefabricated in the factory with high-strength concrete, and the first hole for the annular prestressed tendons and the inlet hole, outlet hole and second hole for the compression tendons are reserved. The prestressed tendons are constructed using the post-tensioning method. When the concrete reaches the designed strength, one end is anchored first, and then the other end is tensioned to the designed prestress value and the anchoring is completed. After the tensioning is completed, the hole is grouted to enhance the bonding strength between the prestressed tendons and the hole, and the two ends are sealed and anchored to ensure long-term reliability.

[0049] Step 5: Installation of lining units

[0050] After the prefabricated lining units are transported to the site, they are assembled according to the designed prestress value to form a complete annular lining structure. The lining unit joints are connected with flexible filling materials.

[0051] Step 6: Sealing layer construction

[0052] Lay a sliding layer on the inner surface of the lining to reduce the friction between the sealing layer and the lining and reduce the impact of deformation on the sealing layer. Then lay a sealing layer on the inner surface of the sliding layer. During construction, the thickened part of the sealing layer needs to be aligned with the lining joint.

[0053] Step 7: Plug Construction

[0054] The two ends of the annular lining structure are respectively sealed by two plugs.

[0055] Step 8: Monitor Structural Construction

[0056] It includes lining unit monitoring, lining unit joint monitoring, and sealing structure monitoring. Each monitoring component is independent of each other, and its construction node is interspersed in the construction process of the corresponding monitored object. Due to the large volume and axial length of the underground energy storage chamber, it is sufficient to set up a group of monitoring at a certain distance in the extension direction of the chamber, or focus on monitoring weak positions and install a control structure in the monitoring room.

[0057] Step 9: Pressurization, commissioning and operation of the energy storage chamber

[0058] After completing the above construction processes, the inflation and gas injection equipment is installed, and the pressurization and pressure relief debugging and trial operation are carried out in the energy storage chamber. The construction quality, operation stability and sealing performance of the energy storage chamber are detected and analyzed through the dual means of remote monitoring system and manual entry into the chamber for monitoring. After confirming that it meets the design requirements, it is allowed to enter normal operation.

[0059] Step 9: Control and maintenance during operation

[0060] During the long-term operation of underground energy storage chambers, the lining structure, sealing structure and other device structures will age and be damaged to a certain extent, resulting in performance degradation, and maintenance or replacement is necessary. Therefore, through remote monitoring and surveillance systems and regular on-site inspections of the chambers, problems that occur during operation can be discovered and rectified in a timely manner to ensure the long-term stability and sealing performance of the compressed air energy storage underground chambers.

[0061] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

[0062] In summary, the beneficial effects of the technical solution provided by the present invention include:

[0063] (1) By applying circumferential prestress in each lining unit, the tensile strength of the lining unit is effectively improved, and the generation and expansion of cracks on the lining unit are reduced.

[0064] (2) According to the actual stress conditions of the lining at different locations, the prestress value applied to the lining unit is flexibly designed to optimize the stress performance of the lining. The lining units are connected by flexible filling materials. The elastic properties of the materials can adapt to the deformation caused by high internal pressure and cyclic loads, alleviate the stress concentration problem, and improve the stability of the overall lining structure.

[0065] (3) In terms of sealing layer design, the present invention innovatively proposes to perform local thickening only at the connection of the lining units, which not only enhances the durability of the sealing layer, but also reduces the amount of materials used and construction costs. The present invention significantly improves the sealing and long-term stability of the gas storage reservoir through the innovative combination of segmented prestressed lining design, connection of flexible filling materials, and local thickening of the sealing layer, providing a solution that takes both economy and safety into account for the efficient and reliable operation of the compressed air energy storage system.

[0066] (4) The strain gauge 21 can measure the strain of the lining unit body 111 along the circumferential direction of the cylindrical structure in real time, that is, monitor the circumferential deformation of the gas storage chamber body 1 caused by gas pressure during the gas storage process. When the strain monitoring mechanism 2 detects that the strain of the lining unit body 111 has changed, the tensioning mechanism 32 will adjust the tension of the compression rib 31 according to the change in the strain. If the strain increases, it means that the gas storage chamber body 1 is subjected to a greater circumferential pressure. At this time, the tensioning mechanism 32 will increase the tension of the compression rib 31 to resist this pressure; conversely, if the strain decreases, the tensioning mechanism 32 will reduce the tension of the compression rib 31. Through this adjustment mechanism, the compression force between the lining units can be dynamically adjusted according to the strain of the lining unit body 111 along the circumferential direction of the cylindrical structure, thereby effectively balancing and reducing the pressure fluctuation of the filling material during the inflation and deflation cycle, and significantly improving its durability and service life.

Claims

1. An assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress, characterized in that: include: A gas storage chamber body, the gas storage chamber body comprising a plurality of lining units, a plurality of the lining units can be assembled into a cylindrical structure for gas storage, each of the lining units comprises a lining unit body and a plurality of prestressed tendons, a plurality of first channels extending around the circumference of the cylindrical structure are provided in the lining unit body, each of the prestressed tendons is in a tensioned state and is fixedly embedded in a corresponding first channel; A strain monitoring mechanism, wherein the strain monitoring mechanism comprises a plurality of strain gauges, each of which is arranged on the inner side wall of the lining unit body and is used to measure the strain amount of the lining unit body along the circumferential direction of the cylindrical structure; and The clamping mechanism comprises a plurality of clamping ribs and a tensioning mechanism; the clamping ribs are used to bind each of the lining unit bodies, and the tensioning mechanism is connected to both ends of the clamping ribs and can drive both ends of the clamping ribs to move, so as to adjust the tension of each clamping rib according to the strain of the lining unit body along the circumferential direction of the cylindrical structure.

2. The assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress according to claim 1 is characterized in that: An inlet hole and an outlet hole are provided on the outer side wall of one of the lining unit bodies, one end of the inlet hole is located on the outer side wall of the lining unit body, and the other end is located at one end of the lining unit body, one end of the outlet hole is located on the outer side wall of the lining unit body, and the other end is located at the other end of the lining unit body, and each of the other lining unit bodies is also provided with a second channel extending circumferentially around the cylindrical structure, the compression rib enters the interior of the lining unit body through the inlet hole, passes through the second channels of other lining unit bodies in sequence, and then extends out from the outlet hole of the lining unit body.

3. The assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress according to claim 2 is characterized in that: The tensioning mechanism includes a clamping plate, two protective plates, a mounting plate, two screws and a rotating drive component. The clamping plate is fixedly connected to both ends of the clamping rib. Two parallel screw holes are provided on the clamping plate. One end of the two protective plates is fixed to a lining unit body having a wire inlet and a wire outlet. Both ends of the mounting plate are respectively fixed to the other ends of the two protective plates. One end of the two screws is respectively rotatably set on the two protective plates. The other ends of the two screws are both rotatably set on the mounting plate. The two screws are respectively rotatably inserted into the two screw holes. The rotating drive component is connected to the two screws and is used to drive the two screws to rotate synchronously.

4. The assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress according to claim 3 is characterized in that: The tensioning mechanism further comprises two fixing blocks, the two fixing blocks are respectively fixed on the two protection plates, and one ends of the two screw rods are respectively rotatably arranged on the two fixing blocks.

5. The assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress according to claim 4 is characterized in that: The tensioning mechanism also includes a first bearing and a second bearing, the inner ring of the first bearing is fixedly sleeved on the screw rod, the outer ring of the first bearing is fixedly connected to the fixing block, the inner ring of the second bearing is fixedly sleeved on the screw rod, and the outer ring of the second bearing is fixedly connected to the mounting plate.

6. The assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress according to claim 3 is characterized in that: The rotary drive component includes a rotary drive motor, two driving pulleys, two driven pulleys and two synchronous belts. The housing of the rotary drive motor is fixed to the mounting plate. The two driving pulleys are coaxially fixed to the output shaft of the rotary drive motor. The two driven pulleys are coaxially fixed to the two screw rods respectively. One end of the two synchronous belts is respectively wound around the two driving pulleys, and the other end of the two synchronous belts is respectively wound around the two driven pulleys.

7. The assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress according to claim 6 is characterized in that: The tensioning mechanism also includes a receiving shell, which is fixed to the mounting plate. A through hole is formed on the receiving shell. The shell of the rotating drive motor is fixed in the receiving shell. The output shaft of the rotating drive motor passes through the through hole and extends out of the receiving shell. The output shaft of the rotating drive motor is rotatably disposed in the through hole.

8. The assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress according to claim 1 is characterized in that: A detection groove is provided on the inner side wall of the lining unit body, and the strain gauge is fitted in the detection groove.

9. The assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress according to claim 1 is characterized in that: The gas storage chamber body also includes a sliding layer, a sealing layer and a buffer layer. The sliding layer is arranged on the inner wall of the lining unit body, the sealing layer is arranged on the inner wall of the sliding layer, the buffer layer is arranged between the outer wall of the concrete lining and the surrounding rock, and drainage holes are opened in the buffer layer.

10. The assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress according to claim 9 is characterized in that: The thickness of the sealing layer at the connection point between each two adjacent lining unit bodies is greater than the thickness at other positions.

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