Assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress

Abstract

The present invention discloses an assembled compressed air energy storage underground gas storage chamber structure with adjustable circumferential stress, comprising a gas storage chamber body, a strain monitoring mechanism, and a clamping mechanism. The gas storage chamber body comprises a plurality of lining units, and a plurality of the lining units can be assembled into a cylindrical structure for gas storage; the clamping mechanism comprises a plurality of clamping ribs and a tensioning mechanism; the clamping ribs are used to bind the respective lining unit bodies. The beneficial effects provided by the present invention are as follows: the prestressed ribs 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 improving its crack resistance; in addition, the clamping force between the lining units is dynamically adjusted according to the stress magnitude, effectively balancing and reducing the pressure fluctuation of the filling material during the inflation and deflation cycle, significantly improving its durability and service life.

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 (CAES) is a new technology that uses compressed air as a medium to store excess electricity. Its primary purpose is to smooth out peak demand and improve power quality. During periods of low electricity demand, excess grid power drives an air compressor, compressing the air to a high pressure and storing it in an underground chamber. During peak demand, the high-pressure air is released and mixed with a small amount of gas fuel. This air is then burned and expanded in a gas turbine, driving a generator for power generation. As a crucial component of a CAES power plant, underground gas storage is a key technology for ensuring its operational performance and reliability. Currently, the geological structures suitable for CAES are primarily categorized into three types: 1) artificially dissolved salt rock cavities; 2) porous rock in aquifers; and 3) artificially excavated underground chambers in hard rock. Because the first two methods require relatively specialized geological conditions, artificially excavated underground chambers in hard rock are the most viable option for CES in areas with abundant wind resources but lacking specialized geological structures.

[0003] Generally speaking, the lining and sealing layer of a gas storage reservoir are key to its stability and sealing. In existing research, underground gas storage linings mainly include integral cast-in-place and piecemeal assembly.

[0004] Integral cast-in-place linings are widely adopted due to their mature technology and strong integrity. However, under the action of high-pressure alternating loads and temperature loads, integral cast-in-place linings are prone to cracks, and the cracks are numerous and wide. Although linings are allowed to operate with cracks, and cracks in the lining usually do not affect the stability of the gas storage reservoir, too many or too wide cracks can easily lead to failure of the sealing layer. For example, the flexible sealing layer can easily be squeezed into the cracks under the action of high internal pressure, causing local damage or even rupture of the sealing layer. In addition, the generation of cracks can easily trigger 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 such as 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-jointed design alleviates the stress concentration problem caused by high-pressure alternating loads and temperature loads in 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, 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 compressed air energy storage underground gas storage chambers, they need to undergo frequent inflation and deflation cycles, which causes the circumferential stress of the lining units in the gas storage chamber to fluctuate periodically. In current technology, after each lining unit is compressed and fixed by a compression 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, and this phenomenon 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 circumferential 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 number 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 strain. If the strain increases, it means that the main body of the gas storage chamber is subjected to greater circumferential 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 lining unit main body 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 1 is a schematic structural 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 entry hole and a cable exit hole;

[0014] Figure 4 yes Figure 1 A schematic structural diagram of the pressing 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 annular surface is calculated using the numerical simulation method;

[0017] Explanation of reference numerals: 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 rib, 311-anchor, 32-tensioning mechanism, 321-compression plate, 322-protective plate, 323-mounting plate, 324-screw, 3241-first bearing, 3242-second bearing, 325-rotational drive member, 3251-rotational drive 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 solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to 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 circumferential 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 high and low pressure inside the gas storage chamber, thereby effectively balancing and reducing the pressure fluctuations 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 circumferential stress in one embodiment of the present invention. The assembled compressed air energy storage underground gas storage chamber structure with adjustable circumferential stress includes a 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. The lining unit main body 111 is provided with a plurality of first channels 1111 extending circumferentially around the cylindrical structure. Each of the prestressed tendons 112 is in a tensioned state and is fixedly embedded in the corresponding first channel 1111.

[0022] The strain monitoring mechanism 2 includes a plurality of strain gauges 21 . Each of the strain gauges 21 is arranged on the inner wall of the lining unit body 111 and is used to measure the strain 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 number of prestressed tendons 112. The prestressed tendons 112 are in a tensioned state and are 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 due to 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 tendon 31 according to the change in the strain. If the strain increases, it means that the gas storage chamber body 1 is subjected to 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 circumference of the cylindrical structure, thereby effectively balancing and reducing the pressure fluctuations 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 independently without affecting 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 magnitude 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 , a wire inlet hole 1112 and a wire outlet hole 1113 are provided on the outer side wall of one of the lining unit bodies 111. One end of the wire inlet hole 1112 is located on the outer side 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 wire outlet hole 1113 is located on the outer side 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 wire 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 wire outlet hole 1113 of the lining unit body 111. By inserting the compression ribs 31 into the interior of each lining unit body 111, the tightness of the combination between the compression ribs 31 and each lining unit body 111 can be improved. At the same time, each second channel 1114 can also limit the compression ribs 31 to improve the stability of the compression ribs 31.

[0029] In one embodiment, see Figures 1-4 The tensioning mechanism 32 includes a pressing plate 321, two protective plates 322, a mounting plate 323, two screws 324 and a rotating drive member 325. The pressing plate 321 is fixedly connected to the two ends of the pressing rib 31. In this embodiment, the pressing plate 321 is fixedly connected to the two ends of the pressing rib 31 via two anchors 311. Two parallel screw holes are provided on the pressing plate 321. One ends of the two protective plates 322 are fixed to the lining unit body 111 having the wire inlet hole 1112 and the wire 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 main body 111. When close to the lining unit main body 111, the pressure of the compression rib 31 decreases, and when away from the lining unit main body 111, the pressure of the compression rib 31 increases.

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

[0032] In one embodiment, see Figures 1-4 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 mounted on the screw 324, while 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 mounted on the screw 324, while the outer ring of the second bearing 3242 is fixedly connected to the mounting plate 323. The arrangement of the first bearing 3241 and the second bearing 3242 reduces frictional resistance during the rotation of the screw 324, thereby improving the efficiency and stability of the tensioning mechanism 32.

[0033] In one embodiment, see Figure 1-Figure 5 The rotating drive member 325 includes a rotating drive motor 3251, two driving pulleys 3252, two driven pulleys 3253 and two synchronous belts 3254. The housing of the rotating drive motor 3251 is fixed to the mounting plate 323. The two driving pulleys 3252 are coaxially fixed to the output shaft of the rotating drive 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 drive 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 327. The housing 327 is fixed to the mounting plate 323 and has a through-hole. The housing of the rotation drive motor 3251 is fixed within the housing 327. The output shaft of the rotation drive motor 3251 passes through the through-hole and extends outside the housing 327. The output shaft of the rotation drive motor 3251 is rotatably disposed within the through-hole. The housing 327 provides protection for the rotation drive motor 3251, preventing it from being disturbed or damaged by the external environment.

[0035] In one embodiment, see Figures 1-4 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 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 further includes two plugs, which are fixed to the two ends of the cylindrical structure to seal the inner cavity of the cylindrical structure. One of the plugs is provided with a vent hole for connecting to an external gas injection and extraction device.

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

[0039] In one embodiment, see Figure 1 The thickness of the sealing layer 14 at the junction of each pair of adjacent lining unit bodies 111 is greater than at other locations. The sealing layer 14 is made of a flexible filling material and is locally thickened, which not only enhances its durability but also reduces gas storage construction costs.

[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] Based on the geological structure, surrounding rock characteristics, operating pressure, designed burial depth, injection and production rate, injection and production frequency of the energy storage chamber, it is analyzed and determined whether to use segmented prestressed lining. If so, parameter design is carried out, including lining concrete grade, spacing, diameter, strength grade and tensioning force 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 ensure that they meet the strength, stability, and cross-sectional shape requirements. For newly excavated underground chambers, standardized construction is carried out according to the designed cross-sectional shape, and support is provided as excavation progresses.

[0045] Step 3: Buffer layer construction

[0046] The inner wall of the buffer layer is constructed to a quality controlled manner based on standard design cross-sectional dimensions. Construction methods such as mesh shotcrete and formwork cast-in-place can be used, requiring a certain level of structural strength, toughness, and sealing performance. The gap between the buffer layer and the lining can be filled with back-fill grouting to ensure direct contact and load transfer between the two.

[0047] Step 4: Prefabrication of lining units

[0048] The lining units are precast in the factory using high-strength concrete. Pre-reinforced primary channels for the circumferential prestressed tendons and pre-reinforced inlet and outlet holes, as well as secondary channels, are reserved for the compression bars. The prestressed tendons are post-tensioned. Once the concrete reaches the designed strength, one end is anchored, and the other end is tensioned to the designed prestress value to complete the anchoring. After tensioning, the channels are grouting to strengthen the bond between the tendons and the channels, and both ends are sealed 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 prestressing 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] A sliding layer is laid on the inner surface of the lining to reduce friction between the sealing layer and the lining, thus minimizing the impact of deformation on the sealing layer. A sealing layer is then laid on the inner surface of the sliding layer, with the thickened portion of the sealing layer aligned with the lining joints during construction.

[0053] Step 7: Plug construction

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

[0055] Step 8: Monitor Structural Construction

[0056] This includes monitoring of lining units, lining unit joints, and sealing structures. Each monitoring component is independent of the others, and its construction nodes are interspersed with the construction process of the corresponding monitored object. Due to the large volume and axial length of underground energy storage chambers, it is sufficient to set up a group of monitoring units at regular intervals along the extension of the chamber. Alternatively, monitoring can be focused on weak points, and a control structure can be installed within the monitoring room.

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

[0058] After completing the above construction processes, the inflation and gas injection equipment is installed, and 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] Over the long term, underground energy storage chambers experience a degree of aging and damage to their linings, sealing structures, and other components, leading to performance degradation and requiring repair, maintenance, or replacement. Therefore, remote monitoring systems and regular on-site inspections of the chambers are used to identify operational issues and promptly rectify them, ensuring the long-term stability and sealing performance of compressed air energy storage chambers.

[0061] The specific embodiments of the present invention described above do not limit the scope of protection 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 scope of protection 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) The prestress applied to the lining units is flexibly designed based on the actual stress conditions at different locations, optimizing the lining's stress-bearing performance. Lining units are connected using flexible filler materials, whose elastic properties can adapt to deformation caused by high internal pressure and cyclic loading, alleviating stress concentration and improving the stability of the lining's overall structure.

[0065] (3) In terms of sealing layer design, the present invention innovatively proposes a design that only thickens the lining units locally at their joints, which not only enhances the durability of the sealing layer but also reduces material usage and construction costs. Through the innovative combination of a segmented prestressed lining design, flexible filling material connections, and local thickening of the sealing layer, the present invention significantly improves the sealing and long-term stability of the gas storage reservoir, providing a solution that balances economy and safety for the efficient and reliable operation of compressed air energy storage systems.

[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, 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, the plurality of lining units being assembled into a cylindrical structure for gas storage, each of the lining units comprising a lining unit body and a plurality of prestressed tendons, the lining unit body being provided with a plurality of first channels extending circumferentially around the cylindrical structure, each of the prestressed tendons being in a tensioned state and fixedly embedded in a corresponding first channel; a strain monitoring mechanism, the strain monitoring mechanism comprising 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 of the lining unit body along the circumferential direction of the cylindrical structure; and A compression mechanism, comprising a plurality of compression ribs and a tensioning mechanism; the compression ribs are used to bind the lining unit bodies; the tensioning mechanism is connected to both ends of the compression ribs and can drive both ends of the compression ribs to move, so as to adjust the tension of each compression rib according to the strain of the lining unit body along the circumferential direction of the cylindrical structure; A wire inlet and a wire outlet are formed on the outer side wall of one of the lining unit bodies, one end of the wire inlet 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 wire outlet 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; each of the other lining unit bodies is further provided with a second channel extending around the circumference of the cylindrical structure; the compression rib enters the interior of the lining unit body through the wire inlet, then passes through the second channels of the other lining unit bodies in sequence, and then extends out of the wire outlet hole of the lining unit body; 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, and the buffer layer is arranged between the outer wall of the lining unit body and the surrounding rock. Drainage holes are opened in the buffer layer.

2. The assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress according to claim 1 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 the two 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 the lining unit body having a wire inlet hole and a wire outlet hole. The two 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 respectively 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.

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 further includes two fixing blocks, which are respectively fixed on the two protective plates, and one ends of the two screw rods are respectively rotatably arranged on the two fixing blocks.

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 also includes a first bearing and a second bearing, the inner ring of the first bearing is fixedly sleeved on the screw, the outer ring of the first bearing is fixedly connected to the fixed block, the inner ring of the second bearing is fixedly sleeved on the screw, and the outer ring of the second bearing is fixedly connected to the mounting plate.

5. The assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress according to claim 2 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 screws 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.

6. The assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress according to claim 5 is characterized in that: The tensioning mechanism also includes a receiving shell, which is fixed to the mounting plate. A through-hole is provided on the receiving shell. The housing of the rotation drive motor is fixed in the receiving shell. The output shaft of the rotation drive motor passes through the through-hole and extends out of the receiving shell. The output shaft of the rotation drive motor is rotatably disposed in the through-hole.

7. 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.

8. The assembled compressed air energy storage underground gas storage chamber structure with adjustable hoop stress according to claim 1 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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