An underground gas storage reservoir with internal support

Abstract

The present invention discloses an underground gas storage with internal support, belonging to the technical field of underground gas storage, and capable of solving the problem that when the sealing layer of the existing underground gas storage bears external pressure, the sealing layer with a relatively thin thickness will be unstable and damaged, while the sealing layer with a large thickness will increase the project investment. The underground gas storage includes: a lining; a sealing layer provided on the inner wall of the lining; a plurality of telescopic support rings sequentially arranged on the inner side of the sealing layer along the tunnel length direction of the underground gas storage, each telescopic support ring is coaxial with the tunnel body of the underground gas storage and is in close contact with the inner wall of the sealing layer; the telescopic support ring includes a plurality of corrugated plates distributed in a ring shape and a plurality of telescopic members for connecting every two adjacent corrugated plates, and the telescopic members are connected to the undulating ends of the corrugated plates; the telescopic support ring is used to always support the sealing layer during the expansion or contraction process of the underground gas storage. The present invention is used for underground gas storage.

Description

Technical Field

[0001] The present invention relates to an underground gas storage with internal support, belonging to the technical field of underground gas storage. Background Art

[0002] With the continuous growth of energy demand and the pursuit of clean energy, compressed air energy storage technology, as a large-scale energy storage technology, has received extensive attention. The gas storage is a key component of a compressed air energy storage power station, and its safety and stability directly affect the performance of the entire energy storage system. All underground gas storages need to be sealed with a sealing layer. Due to the large underground burial depth of underground gas storages, most of them are below the groundwater level. When the gas storage is in a non-pressure state or a low-pressure state where the groundwater pressure is higher than the pressure inside the storage, the sealing layer bears the external pressure. At this time, the relatively thin sealing layer will be unstable and damaged, and a large-thickness sealing layer will undoubtedly increase the project investment exponentially. Summary of the Invention

[0003] The present invention provides an underground gas storage with internal support, which can solve the problem that when the sealing layer of the existing underground gas storage bears external pressure, the relatively thin sealing layer will be unstable and damaged, while a large-thickness sealing layer will increase the project investment.

[0004] The present invention provides an underground gas storage with internal support, and the underground gas storage includes:

[0005] Lining

[0006] A sealing layer, provided on the inner wall of the lining

[0007] A plurality of telescopic support rings, which are sequentially arranged along the length direction of the underground gas storage on the inner side of the sealing layer. Each telescopic support ring is coaxial with the cavity of the underground gas storage and is in close contact with the inner wall of the sealing layer

[0008] The telescopic support ring includes a plurality of corrugated plates distributed in a ring shape and a plurality of telescopic members for connecting every two adjacent corrugated plates. The telescopic members are connected to the undulating ends of the corrugated plates; the telescopic support ring is used to always support the sealing layer during the expansion or contraction process of the underground gas storage

[0009] Optionally, the corrugated plate is in a sine wave shape

[0010] Optionally, in the circumferential direction of the cavity of the underground gas storage, the radius of curvature of the corrugated plate is the same as that of the cavity of the underground gas storage

[0011] Optionally, the wave height of the corrugated plate is determined according to the allowable stress of the corrugated plate, the number of corrugations of the corrugated plate and the designed internal pressure of the underground gas storage

[0012] The wavelength of the corrugated plate is determined according to the wave height of the corrugated plate.

[0013] Optionally, the thickness of the corrugated plate is determined according to the internal pressure thickness and the external pressure thickness;

[0014] The internal pressure thickness is determined according to the designed internal pressure of the underground gas storage, the inner diameter of the underground gas storage, the allowable stress of the corrugated plate, and the corrugation influence coefficient; wherein, the corrugation influence coefficient is the ratio of the principal stress of the corrugated plate to the principal stress of a flat plate of the same material and the same size;

[0015] The external pressure thickness is determined according to the maximum external pressure of the corrugated plate, the inner diameter of the underground gas storage, the elastic modulus of the corrugated plate, and the Poisson's ratio.

[0016] Optionally, a sealing plate is fixed at the undulating end of the corrugated plate, and the sealing plate covers the undulating end of the corrugated plate;

[0017] The telescopic member is connected to the sealing plates at the ends of two adjacent corrugated plates.

[0018] Optionally, the telescopic member is connected to the sealing plate by a buckle.

[0019] Optionally, the telescopic members of two adjacent telescopic support rings are arranged staggeredly.

[0020] Optionally, the telescopic member is a spring or a hydraulic telescopic rod.

[0021] Optionally, the material of the corrugated plate is alloy steel.

[0022] The beneficial effects that the present invention can produce include:

[0023] The underground gas storage with internal support provided by the present invention, by arranging a plurality of telescopic support rings inside the sealing layer, since the telescopic support ring is composed of a plurality of corrugated plates and telescopic members, when the underground gas storage expands or contracts, the telescopic member can adjust the length of the entire telescopic support ring, so that the corrugated plate always supports the sealing layer, thereby avoiding the instability and damage of the relatively thin sealing layer under pressure, and also avoiding the problem that using a sealing layer with a large thickness will increase the project investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic cross-sectional structure diagram of an underground gas storage with internal support provided by an embodiment of the present invention;

[0025] Figure 2 It is Figure 1 The structural schematic diagram of the AA section in

[0026] Figure 3 It is Figure 1 The structural schematic diagram of the BB section in

[0027] Figure 4 for Figure 1 Schematic diagram of the structure of the CC section.

[0028] Reference numerals:

[0029] 1. Corrugated plate; 2. Expansion member; 3. Sealing layer; 4. Lining; 5. Underground gas storage. DETAILED DESCRIPTION

[0030] The present invention is described in detail below with reference to the embodiments, but the present invention is not limited to these embodiments.

[0031] The embodiment of the present invention provides an underground gas storage with internal support, such as Figures 1 to 4 As shown, the underground gas storage includes:

[0032] Lining 4; in practical applications, it is generally concrete lining.

[0033] The sealing layer 3 is arranged on the inner wall of the lining 4 .

[0034] Multiple retractable support rings are arranged in sequence on the inner side of the sealing layer 3 along the length direction of the underground gas storage reservoir 5. Each retractable support ring is coaxial with the hole body of the underground gas storage reservoir 5 and is in close contact with the inner wall of the sealing layer 3. The retractable support ring includes multiple corrugated plates 1 distributed in a ring shape and multiple retractable parts 2 for connecting every two adjacent corrugated plates 1. The retractable parts 2 are connected to the undulating ends of the corrugated plates 1. The retractable support ring is used to always support the sealing layer 3 during the expansion or contraction of the underground gas storage reservoir 5.

[0035] The corrugated plate 1 can be made of high-strength, corrosion-resistant alloy steel. It can withstand high pressures (self-stabilizing and able to withstand sufficient external pressure during the long-term operation of the underground gas storage 5) and has good durability in humid or corrosive gas storage environments. Furthermore, considering the corrugated structure requires good cold-bending properties, this steel also meets processing requirements.

[0036] The telescopic part 2 needs to have high toughness and a certain degree of elasticity. A spring or a hydraulic telescopic rod with telescopic performance can be selected. It has good elastic limit and fatigue strength, can maintain stable performance during frequent telescopic process, and keep this telescopic support ring in close contact with the sealing layer 3 at all times, ensuring that the small pieces of corrugated plate 1 are firmly connected and adaptable to deformation.

[0037] In this embodiment of the present invention, the corrugated plate 1 utilizes a sinusoidal shape, which improves its compressive strength and deformation adaptability under pressure. Depending on the shape and size of the gas storage reservoir, the circular corrugated plate is divided into 3 to 8 small sections. The wave height and wavelength of the corrugated plate 1 are determined by comprehensively considering factors such as the gas storage reservoir's inner diameter, operating pressure, and steel properties.

[0038] In practical applications, the wave height of the corrugated plate 1 is determined according to the allowable stress of the corrugated plate 1 , the number of corrugations of the corrugated plate 1 and the design internal pressure of the underground gas storage reservoir 5 ; the wavelength of the corrugated plate 1 is determined according to the wave height of the corrugated plate 1 .

[0039] Specifically, the wave height of corrugated plate 1 ,wavelength ;in, is the allowable stress of the corrugated plate 1, is the number of corrugations of corrugated plate 1, is the area reduction coefficient (generally 0.8~0.9 based on experience), is the design internal pressure of the underground gas storage 5, is the correlation coefficient between wavelength and wave height (generally 5~10 based on experience).

[0040] Each small piece of corrugated plate 1 needs to fit the inner wall of the gas storage hole. In the circumferential direction of the hole of the underground gas storage 5, the curvature radius of the corrugated plate 1 is The curvature radius of the cavern of the underground gas storage 5 same.

[0041] In the embodiment of the present invention, the thickness of the corrugated plate 1 can be determined according to the internal pressure thickness and the external pressure thickness.

[0042] Among them, the internal pressure thickness is determined according to the design internal pressure of the underground gas storage reservoir 5, the inner diameter of the underground gas storage reservoir 5, the allowable stress of the corrugated plate 1 and the corrugation influence coefficient; the corrugation influence coefficient is the ratio of the principal stress of the corrugated plate 1 to the principal stress of a flat plate of the same material and size.

[0043] The external pressure thickness is determined according to the maximum external pressure of the corrugated plate 1 , the inner diameter of the underground gas storage reservoir 5 , the elastic modulus and Poisson's ratio of the corrugated plate 1 .

[0044] Specifically, for the thickness of the corrugated plate 1, the larger value of the two cases is taken into account, namely, the internal pressure during operation and the external pressure during maintenance operation. When considering the internal pressure, based on the thin-walled cylinder theory, the influence of the corrugation shape on the bearing capacity is considered and the corrugation influence coefficient is introduced. , this coefficient can be obtained through numerical simulation analysis, that is, (Numerical simulation of the same size conditions, the principal stress of corrugated plate 1 The principal stress of a plate of the same material and size The internal pressure thickness of the corrugated plate 1 is ,in is the design internal pressure of underground gas storage 5, is the inner diameter of the underground gas storage 5, is the allowable stress of the corrugated plate 1; when considering the operation under external pressure, using the theory of cylindrical shell structures under external pressure and combining with the engineering importance and construction influence, a safety reduction factor (with a value ranging from 0.5 to 0.9) is introduced, then , is the maximum external pressure acting on the corrugated plate 1 calculated by numerical simulation, is the elastic modulus of the corrugated plate 1, is the Poisson's ratio, from which the minimum thickness under external pressure can be obtained , that is, the external pressure thickness; finally, the larger value under the two calculation conditions is taken as the design thickness of the corrugated plate 1.

[0045] Preferably, a sealing plate is fixed at the undulating end of the corrugated plate 1, and the sealing plate covers the undulating end of the corrugated plate 1; the telescopic member 2 is connected to the sealing plates at the ends of two adjacent corrugated plates 1.

[0046] In practical applications, the sealing plate is made of steel plate.

[0047] The two ends of the segmented corrugated plate 1 are sealed with steel plates, which can increase the strength of the segmented corrugated plate 1 and is also beneficial to the installation of the telescopic member 2.

[0048] The sealing plates of adjacent corrugated plates 1 are connected together by high-strength springs. The length of the spring should be designed according to the circumferential deformation result of the chamber in numerical calculation. According to Hooke's law, the deformation formula is:

[0049] ;

[0050] Among them, is the deformation amount of the telescopic member 2; is the external force acting on the telescopic member 2; is the cross-sectional area of the telescopic member 2; is the original length of the telescopic member 2; is the elastic modulus of the telescopic member 2.

[0051] Given the circumferential deformation, averaging the circumferential deformation to each telescopic member 2, the original length of the telescopic member 2 can be obtained .

[0052] Further, the telescopic member 2 and the sealing plate are connected by a buckle.

[0053] The two ends of the telescopic member 2 are respectively fixed to the sealing plates of the segmented corrugated plate 1 through a traditional buckle structure. The use of the buckle method is beneficial to disassembly and assembly and convenient for later maintenance. 2 to 3 telescopic members 2 can be installed on one side of each corrugated plate 1.

[0054] In the present invention, the advantage of dividing the corrugated plate 1 into several pieces is that when the gas storage expands or contracts, the corrugated plate 1 can expand or contract simultaneously without being damaged due to excessive stress generated in the corrugated plate 1.

[0055] The advantage of providing the telescopic member 2 is that by using the telescopic property of a spring or a hydraulic telescopic rod, the length of the telescopic support ring can be adjusted to always keep the corrugated plate 1 in close contact with the sealing layer 3.

[0056] The advantage of setting the support plate as the corrugated plate 1 is that the thickness of the support plate can be reduced, and the stiffness of the steel plate can be increased by adopting a corrugated form, thereby improving the support strength.

[0057] The advantage of using steel plates to seal the two ends of the corrugated plate 1 is that it can increase the strength of the corrugated plate 1 and is also beneficial for installing the telescopic member 2.

[0058] The advantage of using a snap structure to fix the telescopic member 2 is that it is beneficial for disassembling and assembling the telescopic member 2, facilitating later maintenance.

[0059] During the actual installation of the telescopic support ring, the telescopic members 2 of adjacent two telescopic support rings are arranged staggeredly.

[0060] Specifically, referring to Figure 1 as shown, one ring of telescopic support ring is arranged every meter (the spacing can be set to 1 m). In the circumferential direction of the tunnel body, the annular corrugated plate is evenly divided into several pieces, and adjacent two corrugated plates 1 are connected by telescopic members 2.

[0061] During the arrangement process, measuring instruments are used to ensure that the center of each ring of telescopic support ring coincides with the axis of the tunnel body, and the rings are parallel to each other, with the error controlled within the range of ±1 cm.

[0062] The width of the telescopic support ring can be 50 cm. According to the length of the tunnel body and the usage requirements, the axial arrangement quantity of the telescopic support rings is determined. In the axial direction, the joints of adjacent two rings of telescopic support rings should be arranged staggeredly to avoid the joints concentrating at the same position, so as to improve the stability of the overall structure.

[0063] Through the design of the corrugated plate 1 in the shape of a sine wave, the present invention improves the compressive resistance and deformation adaptation ability, and can effectively cope with the complex pressure environment of the gas storage.

[0064] By comprehensively considering factors such as the inner diameter of the gas storage, the operating pressure, and the steel material properties, etc., the present invention accurately calculates the wave height, wave length, and thickness of the corrugated plate 1 to ensure the safety and stability of the structure under different working conditions.

[0065] The telescopic member 2 of the present invention is made of a spring or a hydraulic telescopic rod with telescopic performance, which can always maintain stable performance during frequent telescoping, ensure firm connection between the corrugated plates 1, adapt to structural deformation, and keep the corrugated plates 1 in close contact with the sealing layer 3 all the time.

[0066] Through reasonable circumferential and longitudinal arrangement methods, the present invention ensures the overall stability of the structure, and the error control and staggered arrangement of joints further improve the reliability of the structure.

[0067] By providing an internal support structure such as a telescopic support ring, the present invention has a simple structure, is convenient for disassembly and assembly, and is also convenient for maintenance and repair.

[0068] As described above, the above are only several embodiments of the present application, and do not impose any form of limitation on the present application. Although the present application is disclosed above with preferred embodiments, it is not intended to limit the present application. Any person skilled in the art, without departing from the scope of the technical solution of the present application, making some changes or modifications using the technical content disclosed above is equivalent to equivalent implementation cases, and all belong to the scope of the technical solution.

Claims

1. An underground gas storage with internal support, characterized in that The underground gas storage includes: A lining; A sealing layer disposed on the inner wall of the lining; A plurality of telescopic support rings sequentially arranged along the length direction of the underground gas storage hole on the inner side of the sealing layer. Each telescopic support ring is coaxial with the hole body of the underground gas storage and is in close contact with the inner wall of the sealing layer; The telescopic support ring includes a plurality of corrugated plates distributed in a ring shape and a plurality of telescopic members for connecting every two adjacent corrugated plates. The telescopic members are connected to the undulating ends of the corrugated plates; the telescopic support ring is used to always support the sealing layer during the expansion or contraction of the underground gas storage; the corrugated plate is in a sine wave shape; The telescopic members of two adjacent telescopic support rings are arranged staggeredly; A sealing plate is fixed to the undulating end of the corrugated plate, and the sealing plate covers the undulating end of the corrugated plate; the telescopic member is connected to the sealing plates at the ends of two adjacent corrugated plates; The wave height of the corrugated plate is determined according to the allowable stress of the corrugated plate, the number of corrugations of the corrugated plate, and the designed internal pressure of the underground gas storage; the wavelength of the corrugated plate is determined according to the wave height of the corrugated plate; The thickness of the corrugated plate is determined according to the internal pressure thickness and the external pressure thickness; The internal pressure thickness is determined according to the designed internal pressure of the underground gas storage, the inner diameter of the underground gas storage, the allowable stress of the corrugated plate, and the corrugation influence coefficient; wherein, the corrugation influence coefficient is the ratio of the principal stress of the corrugated plate to the principal stress of a flat plate of the same material and the same size; the external pressure thickness is determined according to the maximum external pressure of the corrugated plate, the inner diameter of the underground gas storage, the elastic modulus of the corrugated plate, and the Poisson's ratio.

2. The underground gas storage according to claim 1, characterized in that In the circumferential direction of the hole body of the underground gas storage, the radius of curvature of the corrugated plate is the same as the radius of curvature of the hole body of the underground gas storage.

3. The underground gas storage reservoir according to claim 1, wherein, The telescopic member and the sealing plate are connected by a buckle.

4. The underground gas storage reservoir according to claim 1, characterized in that, The telescopic member is a spring or a hydraulic telescopic rod.

5. The underground gas storage reservoir according to claim 1, characterized in that, The material of the corrugated plate is alloy steel.

Images