A prefabricated sealing system and design method for an artificial chamber for compressed air energy storage

Abstract

This invention relates to a prefabricated sealing system and design method for an artificial chamber for compressed air energy storage. The sealing system includes multiple arc-shaped sealing steel plates evenly distributed circumferentially around the artificial chamber. Adjacent sealing steel plates are sealed together by a circumferentially expandable longitudinal splicing joint. During the inflation and deflation cycle, the prefabricated sealing system of this invention can effectively adapt to the thermal expansion and contraction deformation of the sealing steel plates; it maintains reliable sealing performance under high-pressure operation; and it can withstand the pressure of the surrounding rock without leakage during maintenance and in no-internal-pressure conditions. The longitudinal splicing joint design significantly reduces welding workload and improves construction convenience. Through the low elasticity of the high-viscosity filler and optimized structural design, the sealing system maintains stable sealing performance under dynamic conditions, avoiding sealing failure or structural damage caused by rigid connections.

Description

Technical Field

[0001] This invention relates to the field of underground engineering support technology. More specifically, this invention relates to a prefabricated sealing system and design method for a compressed air energy storage artificial chamber. Background Technology

[0002] Compressed gas energy storage (CAES) technology, as a large-scale, long-term energy storage solution, can effectively mitigate renewable energy fluctuations and improve grid flexibility and security, and has received widespread attention in the energy sector in recent years. Among its components, the underground gas storage facility is a core element of the CAES system, and its sealing performance directly affects the power plant's operational efficiency and safety. Currently, artificially excavated hard rock chambers often use segmented, welded steel plates to form the internal sealing layer to withstand high-frequency, large-temperature-difference, and high-pressure cyclic loads. However, in practical engineering applications, this sealing system faces the following prominent technical bottlenecks:

[0003] (1) Problems of circumferential strain mismatch and corrugation structure under high cycle fatigue loading

[0004] During the normal "injection-storage-release" cycle of a CAES power plant, the internal pressure of the gas storage chamber undergoes periodic changes (typically reaching 4–10 MPa), accompanied by temperature fluctuations (up to tens of degrees Celsius) caused by compressed air. Under the coupled effect of temperature and high pressure, differences in thermal expansion and mechanical response exist between the sealing steel plate and the surrounding rock and lining layer, leading to significant circumferential strain in the steel plate. When the number of energy storage cycles accumulates to thousands or even tens of thousands, the circumferential strain amplitude in local areas of the steel plate may exceed the elastic limit of the sealing material, entering the plastic deformation range, and subsequently inducing low-cycle or high-cycle fatigue damage. Once fatigue cracks initiate and propagate, they will directly destroy the integrity of the sealing layer, causing compressed air leakage, which not only reduces energy storage efficiency but may also threaten the structural safety of the chamber.

[0005] In engineering practice, an attempt was made to incorporate a corrugated structure into the sealing steel plate to absorb some of the circumferential strain using the geometric deformation capacity of the corrugations, thereby reducing the fatigue stress level borne by the steel plate itself. However, the processing and assembly of the corrugated structure faces extremely high precision requirements: the waveform parameters of the corrugations (wave height, wave pitch, radius of curvature) must be precisely matched with the stress and deformation characteristics of the chamber; otherwise, the corrugations may become stress concentration sources. Simultaneously, when multiple corrugated steel plates are spliced ​​inside the tunnel, it is necessary to ensure continuous alignment of the corrugations at the joints, with errors controlled to within millimeters; otherwise, the weld joints will bear additional bending moments and shear forces, exacerbating the risk of cracking. These high-precision processing and assembly requirements significantly increased manufacturing costs and construction difficulty.

[0006] (2) Defects in the quality of steel plate assembly and welding in the confined space inside the tunnel

[0007] Compressed gas storage chambers are typically located hundreds of meters underground, with limited construction space and harsh working environments (humid, dusty, poorly ventilated, etc.). Sealing steel plates must be hoisted, positioned, and spliced ​​piece by piece inside the chamber, and then welded in all positions (including flat, vertical, and overhead welding). Due to irregular chamber walls, interference from the lining structure, and narrow welding operating surfaces, welders find it difficult to maintain stable welding postures and process parameters, easily leading to welding defects such as incomplete fusion, porosity, slag inclusions, and undercut. Furthermore, the high humidity of the underground environment means that if pre-welding dehumidification and preheating are inadequate, the hydrogen content in the weld may exceed the standard, inducing delayed cracking. These minute welding quality defects may be difficult to detect completely with conventional non-destructive testing, but under the high-frequency, high-pressure cyclic operation conditions of CAES (Compressed Gas Storage Equipment), severe stress concentration will occur at the defect sites, accelerating fatigue crack propagation and ultimately causing gas leakage along the weld. Once the seal fails, not only is repair difficult (requiring gas shutdown, venting, and re-welding inside the chamber), but it will also cause prolonged power plant downtime losses. Therefore, how to achieve highly reliable and fully dense steel plate splicing welds in confined underground spaces is a key technical challenge that urgently needs to be overcome in the engineering application of compressed gas storage artificial chambers. Summary of the Invention

[0008] The purpose of this invention is to provide a prefabricated sealing system and design method for a compressed air energy storage artificial chamber to solve the above-mentioned problems.

[0009] To achieve these objectives and other advantages according to the present invention, a prefabricated sealing system for a compressed air energy storage artificial chamber is provided, comprising multiple arc-shaped sealing steel plates evenly distributed circumferentially along the artificial chamber, wherein adjacent sealing steel plates are sealed and connected by a circumferentially retractable longitudinal splicing joint.

[0010] Furthermore, in the aforementioned prefabricated sealing system for a compressed air energy storage artificial chamber, the longitudinal assembly joint includes:

[0011] A cover steel plate is disposed inside the sealing steel plate and is connected to the two corresponding sealing steel plates by movable connectors. The cover steel plate has a groove along the longitudinal direction of the artificial chamber on the side facing the sealing steel plate.

[0012] An elastic connector is disposed in the groove and connected to the covering steel plate. Both ends of the sealing steel plate have inwardly flanged edges that extend into the groove and connect to the elastic connector. The elastic connector is circumferentially expandable and contractible.

[0013] A high-viscosity filler is used to fill the cavity formed by the groove, the porous sealing gasket, and the elastic connector.

[0014] Furthermore, in the prefabricated sealing system of the compressed air energy storage artificial chamber, a porous sealing gasket is provided between the tank and the corresponding two sealing steel plates.

[0015] Furthermore, in the aforementioned prefabricated sealing system for a compressed air energy storage artificial chamber, the movable connecting component includes:

[0016] A positioning element is disposed on the sealing steel plate and is provided with threaded holes;

[0017] A clamping bolt is provided. The cover steel plate has a strip-shaped through hole along the circumference. The clamping bolt passes through the strip-shaped through hole and is threaded into the threaded hole, with its head abutting against the cover steel plate.

[0018] Furthermore, in the aforementioned prefabricated sealing system for a compressed air energy storage artificial chamber, the elastic connector includes:

[0019] Two connecting plates, whose ends are respectively connected to the sealing steel plate and the covering steel plate,

[0020] A guide rod is arranged circumferentially and passes through the two connecting plates. The inner flanges of the two corresponding sealing steel plates extend between the two connecting plates and are passed through by the guide rod.

[0021] The elastic element is provided between both ends of the guide rod and the two connecting plates.

[0022] Furthermore, in the prefabricated sealing system for a compressed air energy storage artificial chamber, the connecting plate is a compressible flexible plate.

[0023] Furthermore, in the prefabricated sealing system for a compressed air energy storage artificial chamber, both ends of the guide rod are provided with limiting components, and the elastic component is a rubber ring, which is sleeved on the guide rod, and its two ends respectively abut against the corresponding limiting component and connecting plate.

[0024] Furthermore, in the prefabricated sealing system of the compressed air energy storage artificial chamber, a buffer pad is provided on the covering steel plate, and the buffer pad is connected to both of the connecting plates.

[0025] Furthermore, in the prefabricated sealing system of the compressed air energy storage artificial chamber, the sealing steel plate is welded from multiple annular plates.

[0026] The present invention also provides a design method for a prefabricated sealing system for a compressed air energy storage artificial chamber as described in any of the preceding claims, comprising the following steps:

[0027] S1. Establish a numerical calculation model of the cross-section of the gas storage chamber, and calculate the maximum displacement of multiple sealing steel plates in the gas storage under the most unfavorable operating conditions. Calculate the maximum circumferential strain generated by multiple sealing steel plates without joints. :

[0028]

[0029] in, The radius of the gas storage facility;

[0030] S2. Calculate the ultimate strain allowed for the sealing steel plate. :

[0031]

[0032] in, This is the reduction factor; The yield strength of the sealing steel plate; The deformation modulus of the sealing steel plate;

[0033] S3. Calculate the allowable circumferential deformation of a single longitudinal assembly joint. :

[0034]

[0035] in, This refers to the number of longitudinal assembly joints;

[0036] S4. When designing longitudinal assembly joints, the circumferential opening must be greater than [a certain value]. .

[0037] The beneficial effects of this invention are:

[0038] The prefabricated sealing system for compressed air energy storage artificial chambers of this invention can effectively adapt to the thermal expansion and contraction deformation of the sealing steel plate during the inflation and deflation cycle; it can maintain reliable sealing performance under high-pressure operating conditions; and it can withstand the pressure of the surrounding rock without leakage during maintenance and in no-internal-pressure conditions. The sealing system adopts a longitudinal assembly joint connection design, which significantly reduces the amount of welding work and improves the convenience of construction. Through the low elastic modulus properties of the high-viscosity filler and the optimized structural design, the sealing system maintains stable sealing performance under dynamic operating conditions, avoiding sealing failure or structural damage caused by rigid connections. Furthermore, this invention details the design process of this prefabricated sealing system, including: calculation of steel plate deformation, determination of high-viscosity filler parameters, calculation of compressive stress requirements, and selection of key structural parameters. This design method is logically clear, with well-defined steps, and has good engineering applicability, facilitating efficient implementation and widespread application by technical personnel.

[0039] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0040] Figure 1 This is a cross-sectional schematic diagram of the prefabricated sealing system for the compressed air energy storage artificial chamber described in this invention.

[0041] Figure 2 This is a longitudinal section schematic diagram of the prefabricated sealing system for the compressed air energy storage artificial chamber described in this invention;

[0042] Figure 3 This is a schematic diagram of the longitudinal assembly joint described in this invention;

[0043] Figure 4 This is a schematic diagram of the longitudinal assembly joint described in this invention;

[0044] Figure 5 This is a schematic diagram showing the connection between the clamping bolt and the cover steel plate described in this invention;

[0045] Figure 6 This is a flowchart of the design method described in this invention.

[0046] The reference numerals in the attached figures are as follows:

[0047] 1. Sealing steel plate; 2. Longitudinal assembly joint; 3. Circumferential weld; 4. Covering steel plate; 5. Clamping bolt; 6. Porous sealing gasket; 7. Buffer pad; 8. Guide rod; 9. High-viscosity filler; 10. Connecting plate; 11. Rubber ring; 12. Strip-shaped through hole. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the embodiments of this application, so that those skilled in the art can implement them based on the description. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0049] Unless otherwise specified, the experimental methods described in the following embodiments are conventional methods, and the reagents and materials described are commercially available unless otherwise specified. In the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0051] First, a brief introduction to the design concept of the embodiments of this application will be given.

[0052] The embodiments of this application address the issue of fluctuating internal pressure and temperature within a compressed air energy storage chamber during the inflation and deflation cycle. A circumferentially expandable longitudinal splicing joint 2 is used to seal the sealing steel plates 1, forming a circumferentially expandable sealing system. This system effectively accommodates the thermal expansion and contraction of the sealing steel plates 1 during inflation and deflation; maintains reliable sealing performance under high-pressure operating conditions; and withstands surrounding rock pressure without leakage during maintenance and in pressure-free conditions. The sealing system maintains stable sealing performance under dynamic operating conditions, avoiding sealing failure or structural damage caused by rigid connections.

[0053] like Figure 1 As shown, an embodiment of the present invention provides a prefabricated sealing system for a compressed air energy storage artificial chamber, including multiple arc-shaped sealing steel plates 1. The multiple sealing steel plates 1 are evenly distributed around the artificial chamber, and adjacent sealing steel plates 1 are sealed and connected by a circumferentially expandable longitudinal splicing joint 2.

[0054] In this embodiment, the artificial chamber is cylindrical, and the sealing system is correspondingly cylindrical. The sealing steel plate 1 is set as an arc-shaped plate, and multiple sealing steel plates 1 are evenly distributed around the artificial chamber. Adjacent sealing steel plates 1 are sealed and connected by longitudinal splicing joints 2. After the multiple sealing steel plates 1 are assembled, they form a cylindrical sealing system.

[0055] To ensure the sealing system of the compressed air energy storage chamber can effectively adapt to the thermal expansion and contraction deformation of the sealing steel plates 1 during the air filling and discharging cycle, adjacent sealing steel plates 1 are sealed together via longitudinal splicing joints 2. During the air filling and discharging cycle, as the sealing steel plates 1 move relative to each other, the circumferentially expandable longitudinal splicing joints 2 ensure a tight seal between them. Simultaneously, the longitudinal splicing joints 2 reduce the welding workload of the sealing system and improve construction convenience.

[0056] Preferably, as another embodiment of the present invention, such as Figure 3 and Figure 4 As shown, the longitudinal assembly joint 2 includes:

[0057] A cover steel plate 4 is disposed inside the sealing steel plate 1 and is connected to the corresponding two sealing steel plates 1 respectively through movable connectors. The cover steel plate 4 has a groove along the longitudinal direction of the artificial chamber on the side facing the sealing steel plate 1.

[0058] An elastic connector is disposed in the groove and connected to the covering steel plate 4. Both ends of the sealing steel plate 1 are provided with inwardly turned flanges that extend into the groove and connect to the elastic connector. The elastic connector is circumferentially expandable and contractible.

[0059] The high-viscosity filler 9 is used to fill the cavity formed by the groove, the porous sealing gasket 6 and the elastic connector.

[0060] In this embodiment, the covering steel plate 4 is fixed to the sealing steel plate 1 by a movable connector. A pre-tightening force is applied to the sealing steel plate 1 through the movable connector, compressing the high-viscosity filler 9 between the covering steel plate 4 and the movable connector. The contact stress between the high-viscosity filler 9 and the sealing steel plate 1 is used for sealing, ensuring a sealed connection between the two sealing steel plates 1. Furthermore, the high-viscosity filler 9 and the elastic connector can expand and contract in the circumferential direction, applying a force that brings the two sealing steel plates 1 closer together, achieving elastic expansion and contraction of the sealing system. Under the cyclic operation conditions of the chamber, the high-viscosity filler 9 and the elastic connector act as a "deformation buffer," utilizing the low elastic modulus of the materials to absorb and release the stress generated by the expansion and contraction of the steel plates, maintaining structural integrity and preventing seal failure or material tearing due to excessive deformation.

[0061] Both ends of the sealing steel plate 1 are provided with inward flanges, which are arranged radially along the artificial chamber, such as... Figure 3 As shown, when there is no gap between two adjacent sealing steel plates 1, the two inner flanges are fitted together.

[0062] The high-viscosity filler 9 is divided into two parts by an elastic connector and is in a compressed state. The two parts of the high-viscosity filler 9 exert a force on the two sealing steel plates 1, bringing them closer together. The high-viscosity filler 9 is made of silicone-based or epoxy-based high-viscosity sealant with an elastic modulus of 0.1-0.5 MPa. It has excellent flowability, low elastic modulus, and long-term weather resistance, ensuring sealing performance at high temperatures.

[0063] Preferably, in another embodiment of the present invention, a porous sealing gasket 6 is provided between the groove and the corresponding two sealing steel plates 1.

[0064] In this embodiment, the porous sealing gasket 6 is made of highly elastic silicone or EPDM rubber and has a porous structure. It deforms under the pre-tightening force of the movable connector to form a sealing layer between the cover steel plate 4 and the sealing steel plate 1.

[0065] Preferably, in another embodiment of the present invention, the movable connector includes:

[0066] A positioning element is provided on the sealing steel plate 1 and has threaded holes;

[0067] The clamping bolt 5 is provided with a strip-shaped through hole 12 along the circumference of the cover steel plate 4. The clamping bolt 5 passes through the strip-shaped through hole 12 and is threaded into the threaded hole, and its head abuts against the cover steel plate 4.

[0068] In this embodiment, by rotating the clamping bolt 5, the position of the head of the clamping bolt 5 is adjusted, and the head of the clamping bolt 5 limits the cover steel plate 4, thereby adjusting the preload force of the movable connector on the sealing steel plate 1. Simultaneously, since the positions between adjacent sealing steel plates 1 may change, a strip-shaped through hole 12 is provided circumferentially on the cover steel plate 4, such as... Figure 5 As shown, the clamping bolt 5 can slide in the strip-shaped through hole 12 as the sealing steel plate 1 moves, allowing the clamping bolt 5 to move along the strip-shaped through hole 12 when the sealing steel plate 1 deforms, avoiding bolt breakage or seal failure due to stress concentration caused by deformation, while ensuring the continuous action of the preload.

[0069] Preferably, in another embodiment of the present invention, the elastic connector includes:

[0070] Two connecting plates 10, with their ends respectively connected to the sealing steel plate 1 and the covering steel plate 4,

[0071] The guide rod 8 is arranged circumferentially and passes through the two connecting plates 10. The inner flanges of the two corresponding sealing steel plates 1 extend between the two connecting plates 10 and are passed through by the guide rod 8.

[0072] The elastic element is provided between both ends of the guide rod 8 and the two connecting plates 10.

[0073] In this embodiment, the guide rod 8 acts as a limiter, restricting the movement trajectory of the inner flanges of the two sealing steel plates 1. At the same time, the elastic element is always in a compressed state, and the two elastic elements bring the two sealing steel plates 1 closer to each other.

[0074] Preferably, in another embodiment of the present invention, the connecting plate 10 is a compressible flexible plate.

[0075] In this embodiment, the connecting plate 10 may be composed of a perforated rubber pad or a hollow aluminum plate, which absorbs the impact force generated by the expansion and contraction deformation of the sealing steel plate 1, realizes circumferential deformation release, protects the sealing structure from mechanical damage, and extends its service life.

[0076] Preferably, in another embodiment of the present invention, both ends of the guide rod 8 are provided with limiting members, and the elastic member is a rubber ring 11, which is sleeved on the guide rod 8, and its two ends respectively abut against the corresponding limiting member and the connecting plate 10.

[0077] In this embodiment, the guide rod 8 and the limiting member can be double-headed bolts, which are used for the pre-assembly and positioning of the sealing steel plate 1, and at the same time, adapt to the circumferential deformation of the steel plate during operation to ensure the continuous stability of the sealing system.

[0078] Preferably, in another embodiment of the present invention, the covering steel plate 4 is provided with a buffer pad 7, and the buffer pad 7 is connected to both of the connecting plates 10.

[0079] In this embodiment, by setting a buffer pad 7 at the end of the cover steel plate 4, the required elastic deformation capacity is provided, as well as sufficient compressive strength and extrusion resistance, preventing it from being squeezed into the gap and failing under high pressure, protecting the sealing structure from mechanical damage, and improving the system durability.

[0080] Preferably, in another embodiment of the present invention, the sealing steel plate 1 is welded from multiple annular plates.

[0081] In this embodiment, such as Figure 2 As shown, the sealing steel plate 1 is welded from multiple annular plates, and multiple circumferential welds 3 are formed on the sealing steel plate 1, which reduces the processing difficulty of the sealing steel plate 1.

[0082] Embodiments of the present invention also provide a design method for a prefabricated sealing system for a compressed air energy storage artificial chamber as described in any of the preceding claims, comprising the following steps:

[0083] S1. Establish a numerical calculation model of the cross-section of the gas storage chamber, and calculate the maximum displacement of multiple sealing steel plates 1 under the most unfavorable working conditions. Calculate the maximum circumferential strain generated by multiple sealing steel plates 1 without joints. :

[0084]

[0085] in, The radius of the gas storage facility;

[0086] S2. Calculate the ultimate strain allowed to occur in the sealing steel plate 1. :

[0087]

[0088] in, This is the reduction factor; The yield strength of the sealing steel plate 1; The deformation modulus of the sealing steel plate 1;

[0089] S3. Calculate the allowable circumferential deformation of a single longitudinal assembly joint 2. :

[0090]

[0091] in, This refers to the number of longitudinal assembly joints 2;

[0092] S4. When designing longitudinal assembly joint 2, its circumferential opening amount must be greater than [missing information]. .

[0093] In this embodiment, before designing the longitudinal assembly joint 2, the above method calculates that the circumferential opening of the longitudinal assembly joint 2 can ensure that under the most unfavorable working conditions of the gas storage tank, the circumferential opening of the longitudinal assembly joint 2 can meet the displacement generated by the multiple sealing steel plates 1.

[0094] like Figure 6 As shown, embodiments of the present invention also provide a design method for a prefabricated sealing system for a compressed air energy storage artificial chamber as described in any of the preceding claims, comprising the following steps:

[0095] S1. Establish a numerical calculation model of the gas storage chamber cross-section, calculate the maximum displacement u of the sealing layer steel plate under the most unfavorable working conditions (poor surrounding rock conditions and large burial depth), and then obtain the maximum circumferential strain generated by the jointless flat steel plate. ,

[0096]

[0097] in, The radius of the gas storage facility.

[0098] S2. Determine the number of segmented joints n, and calculate the allowable circumferential deformation δ of a single joint. Based on the maximum circumferential strain ɛ generated by the jointless flat steel plate calculated in S1, design the allowable ultimate strain of the steel plate. for:

[0099]

[0100] in, This is the reduction factor; The yield strength of the sealing steel plate 1; The deformation modulus of the sealing steel plate 1;

[0101] After determining the number n of the sealing steel plate 1 segments, the allowable circumferential deformation δ of the longitudinal assembly joint 2 can be calculated.

[0102]

[0103] in, This refers to the number of longitudinal assembly joints 2;

[0104] S3. Calculate the parameters of high-viscosity filler 9 and buffer pad 7 through experiments; the elastic modulus E and filling thickness h of high-viscosity filler 9 should be determined according to the experiment to ensure that after the clamping bolt 5 is pre-tightened, the contact pressure can reach the upper limit of the internal pressure of compressed air energy storage; the width b of high-viscosity filler 9 should be determined according to the experiment to ensure that the airtightness of high-viscosity filler 9 after pre-tightening meets the design requirements.

[0105] S4. Based on the allowable circumferential deformation δ of the longitudinal assembly joint 2 determined in S2, a finite element analysis model of the joint deformation is established. By adjusting the thickness, stiffness, and compressible deformation of the compressible pad, the joint opening reaches the design value δ under overall deformation conditions. Furthermore, the compressible pad can adopt a structural form such as perforated rubber or a prefabricated hollow aluminum square box.

[0106] In this embodiment, the above method is applied to a gas storage chamber under the following conditions:

[0107] The gas storage chamber is circular with a diameter of 18m, a maximum operating internal pressure of 18MPa, a burial depth of 200m, and is in Class III surrounding rock. The structure consists of a 20cm concrete support layer, a 5cm mortar slip layer, and a 10mm steel plate sealing layer. The steel plate is made of Q420 steel, and the sealing system uses high-viscosity silicone-based sealant (elastic modulus of 0.3MPa). The physical and mechanical parameters of the surrounding rock are: elastic modulus of 8GPa, friction angle of 50°, cohesion of 1.5MPa, and density of 2650kg / m³.

[0108] S1. Using a thermodynamic and mechanical coupled analysis method, the cyclic process of alternating temperature and pressure loads during the filling and releasing of the gas storage tank is simulated. The thermal expansion and contraction deformation and circumferential deformation of the sealing steel plate 1 caused by temperature changes and pressure fluctuations during the filling and releasing process are calculated. The maximum displacement of the surrounding rock of the gas storage tank under the above conditions is calculated to be 3.78 cm, and the maximum circumferential strain of the sealing layer steel plate is obtained as 4.2‰.

[0109] S2, according to the current production and welding process of sealing steel plate 1, sealing steel plate 1 can be designed in 12 equal blocks, so the number of joints n=12; based on the deformation of sealing steel plate 1 calculated by S1, combined with the functional requirements of sealing structure and material performance limits, the allowable deformation is calculated to be 18.75mm, and the allowable deformation of the longitudinal assembly joint 2 is determined to be δ=20mm.

[0110] S3, based on the allowable deformation δ=20mm of the longitudinal assembly joint 2 determined in S2, the elastic modulus E and filling thickness h of the high-viscosity filler 9 are determined by experiment. The elastic modulus E1 of the high-viscosity filler 9 is 0.3MPa (meeting the requirement of 0.1-0.5MPa), and the filling thickness is h=24cm;

[0111] S4. Based on the allowable circumferential deformation δ of the longitudinal assembly joint 2 determined in S2, a finite element analysis model of the joint deformation is established. The thickness, stiffness and compressible deformation of the compressible pad are adjusted to achieve the design value δ of the joint opening under the overall deformation condition.

[0112] Furthermore, although the operations of the method of this application are described in a specific order in the accompanying drawings, this does not require or imply that these operations must be performed in that specific order, or that all the operations shown must be performed to achieve the desired result. Additionally or alternatively, certain steps may be omitted, multiple steps may be combined into one step, and / or one step may be broken down into multiple steps.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application do not depart from the spirit and scope of the technical solutions of this application, and should all be covered within the scope of the claims of this application.

Claims

1. A prefabricated sealing system for a compressed air energy storage artificial chamber, characterized in that, It includes multiple arc-shaped sealing steel plates, which are evenly distributed around the artificial chamber. Adjacent sealing steel plates are sealed and connected by a circumferentially expandable longitudinal splicing joint.

2. The prefabricated sealing system for a compressed air energy storage artificial chamber as described in claim 1, characterized in that, The longitudinal assembly joint includes: A cover steel plate is disposed inside the sealing steel plate and is connected to the two corresponding sealing steel plates by movable connectors. The cover steel plate has a groove along the longitudinal direction of the artificial chamber on the side facing the sealing steel plate. An elastic connector is disposed in the groove and connected to the covering steel plate. Both ends of the sealing steel plate have inwardly flanged edges that extend into the groove and connect to the elastic connector. The elastic connector is circumferentially expandable and contractible. A high-viscosity filler is used to fill the cavity formed by the groove, the porous sealing gasket, and the elastic connector.

3. The prefabricated sealing system for a compressed air energy storage artificial chamber as described in claim 2, characterized in that, A porous sealing gasket is provided between the groove and the corresponding two sealing steel plates.

4. The prefabricated sealing system for a compressed air energy storage artificial chamber as described in claim 2, characterized in that, The movable connector includes: A positioning element is disposed on the sealing steel plate and is provided with threaded holes; A clamping bolt is provided. The cover steel plate has a strip-shaped through hole along the circumference. The clamping bolt passes through the strip-shaped through hole and is threaded into the threaded hole, with its head abutting against the cover steel plate.

5. The prefabricated sealing system for a compressed air energy storage artificial chamber as described in claim 2, characterized in that, The elastic connector includes: Two connecting plates, whose ends are respectively connected to the sealing steel plate and the covering steel plate, A guide rod is arranged circumferentially and passes through the two connecting plates. The inner flanges of the two corresponding sealing steel plates extend between the two connecting plates and are passed through by the guide rod. The elastic element is provided between both ends of the guide rod and the two connecting plates.

6. The prefabricated sealing system for a compressed air energy storage artificial chamber as described in claim 5, characterized in that, The connecting plate is a compressible flexible plate.

7. The prefabricated sealing system for a compressed air energy storage artificial chamber as described in claim 5, characterized in that, Both ends of the guide rod are provided with limiting members, and the elastic member is a rubber ring, which is sleeved on the guide rod, and its two ends respectively abut against the corresponding limiting member and the connecting plate.

8. The prefabricated sealing system for a compressed air energy storage artificial chamber as described in claim 5, characterized in that, The cover steel plate is provided with a buffer pad, which is connected to both of the connecting plates.

9. The prefabricated sealing system for a compressed air energy storage artificial chamber as described in claim 1, characterized in that, The sealing steel plate is welded from multiple annular plates.

10. A design method for a prefabricated sealing system for a compressed air energy storage artificial chamber as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Establish a numerical calculation model of the cross-section of the gas storage chamber, and calculate the maximum displacement of multiple sealing steel plates in the gas storage under the most unfavorable operating conditions. Calculate the maximum circumferential strain generated by multiple sealing steel plates without joints. : in, The radius of the gas storage facility; S2. Calculate the ultimate strain allowed for the sealing steel plate. : in, This is the reduction factor; The yield strength of the sealing steel plate; The deformation modulus of the sealing steel plate; S3. Calculate the allowable circumferential deformation of a single longitudinal assembly joint. : in, This refers to the number of longitudinal assembly joints; S4. When designing longitudinal assembly joints, the circumferential opening must be greater than [a certain value]. .

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