A new type of high-pressure double-membrane gasholder and installation method

Abstract

This invention discloses a novel high-pressure double-membrane gas storage tank and its installation method, comprising a foundation ring beam, an outer membrane, an inner membrane, a bottom membrane, and a flexible connecting device. The outer membrane, inner membrane, and bottom membrane are all fixed to the foundation ring beam, with a gas storage cavity formed between the inner and bottom membranes, and an inter-membrane cavity formed between the outer and inner membranes. The outer membrane comprises multiple membrane sheets segmented along a meridian, and these membrane sheets are connected into a whole by the flexible connecting device. The flexible connecting device includes a steel cable structure and multiple fixing units distributed along the meridian. A gap is reserved between adjacent fixing units on the same meridian. The steel cable structure is connected to each fixing unit. Each fixing unit includes a first clamping plate, a second clamping plate, and a fastening assembly. The first and second clamping plates are located on the inner and outer sides of the splicing area of ​​adjacent membrane sheets, respectively, and are pressed together by the fastening assembly. This invention can solve the problems of low pressure and insufficient volume in existing ordinary double-membrane gas storage tanks, as well as the high cost, long construction period, and complex maintenance of external steel inner membrane gas storage tanks.

Description

Technical Field

[0001] This invention relates to the field of gas storage equipment technology, specifically to a novel high-pressure double-membrane gas storage tank and its installation method suitable for storing biogas, natural gas, syngas, biomass gas and other low- to medium-low-pressure combustible gases. Background Technology

[0002] Existing dual-membrane gas storage tanks typically consist of an inner membrane, an outer membrane, a foundation ring beam, an air supply system, and a control system. These tanks maintain their shape by continuously supplying air into the membrane cavity and store and release gas by raising and lowering the inner membrane. They offer advantages such as light weight, rapid construction, and good corrosion resistance, making them widely used in wastewater treatment, livestock biogas production, anaerobic fermentation of kitchen waste, industrial organic wastewater treatment, and renewable energy projects.

[0003] However, traditional dual-membrane gas storage tanks rely primarily on the tension of the membrane material itself and the intermembrane air pressure for structural pressure support. Their effective volume is typically limited to a maximum of around 20,000 m³, and their operating pressure is generally 600 Pa to 800 Pa. For large-scale biogas projects, regional centralized gas supply projects, and projects requiring stable low-to-medium pressure gas supply, traditional dual-membrane gas storage tanks suffer from insufficient pressure and inadequate effective volume, making it difficult to simultaneously meet the requirements of large-capacity storage and high output pressure.

[0004] To address the issue of insufficient pressure-bearing capacity in dual-membrane gas storage tanks, existing technologies also employ an external steel and internal membrane gas storage tank design. This type of structure uses an external steel shell to bear the main load, while the internal membrane isolates the gas medium. This allows for a gas storage capacity of up to 150,000 m³ and an operating pressure of 2.5 kPa to 4 kPa, effectively meeting the engineering requirements for higher pressures and larger volumes.

[0005] However, the external steel internal membrane gas storage tank still has obvious drawbacks: First, the manufacturing and installation costs of the steel structure are high, and the overall cost is significantly higher than that of double membrane structures; Second, the large number of steel components and the large amount of on-site assembly work make construction organization complex, construction difficult, and the project cycle usually requires 5 to 6 months; Third, the extensive use of steel increases material consumption and transportation and hoisting costs, resulting in a waste of steel resources; Fourth, the steel shell is exposed to the outdoor environment for a long time, requiring anti-corrosion maintenance, weld inspection and structural maintenance, resulting in a large amount of maintenance work in the later stage.

[0006] Therefore, how to further improve the effective volume and pressure-bearing capacity of double-membrane gas storage tanks while retaining their advantages of convenient construction, lightweight materials, and simple maintenance, so that their performance is close to that of external steel internal membrane gas storage tanks, and at the same time significantly reduce costs and construction difficulties, has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] The purpose of this invention is to provide a novel high-pressure double-membrane gas storage tank and its installation method. This double-membrane gas storage tank can improve the pressure-bearing capacity and upper volume limit of the double-membrane structure, thereby solving the problems of low pressure and insufficient volume of existing ordinary double-membrane gas storage tanks, as well as the high cost, long construction period, and complex maintenance of outer steel inner membrane gas storage tanks.

[0008] This invention is achieved through the following technical solution: In a first aspect, the present invention provides a novel high-pressure dual-membrane gas storage tank, comprising a base ring beam, an outer membrane, an inner membrane, a bottom membrane, and a flexible connecting device; the outer membrane, inner membrane, and bottom membrane are all fixed on the base ring beam, and a gas storage cavity is formed between the inner membrane and the bottom membrane, and an inter-membrane cavity is formed between the outer membrane and the inner membrane; the outer membrane comprises multiple membrane sheets divided along a meridian, and the multiple membrane sheets are connected into a whole by the flexible connecting device; the flexible connecting device comprises a steel cable structure and multiple fixing units distributed along a meridian, with a gap reserved between adjacent fixing units on the same meridian, the steel cable structure being connected to each fixing unit, and the fixing unit comprising a first clamping plate, a second clamping plate, and a fastening assembly, the first clamping plate and the second clamping plate being located on the inner and outer sides of the splicing part of adjacent membrane sheets respectively, and the fastening assembly applying a clamping force to the first clamping plate and the second clamping plate.

[0009] As a further embodiment of the present invention, the cable structure includes a central top plate and pressure-bearing steel ropes; the central top plate is disposed on the top of the outer membrane, and each membrane sheet of the outer membrane is connected to the central top plate; there are multiple pressure-bearing steel ropes and they are evenly distributed around the central top plate, with the upper end of each pressure-bearing steel rope anchored to the central top plate and the lower end anchored to the foundation ring beam, and each pressure-bearing steel rope is connected to all fixed units on each warp line.

[0010] As a further embodiment of the present invention, the second clamping plate is located on the outside of the outer membrane, and a plurality of fixing seats are provided on the second clamping plate. The fixing seats are provided with cable holes adapted to the pressure-bearing steel rope, and the pressure-bearing steel rope is passed through the cable holes.

[0011] As a further aspect of the present invention, the gap between adjacent fixed units on the same meridian is 1mm to 5mm.

[0012] As a further embodiment of the present invention, the fastening assembly includes a plurality of anti-loosening bolts arranged at intervals along the length direction of the fixing unit. The anti-loosening bolts pass through bolt holes on the first clamping plate and the second clamping plate and are then locked by nuts to achieve clamping and fixing of adjacent diaphragms.

[0013] As a further aspect of the present invention, the adjacent membranes between the first clamping plate and the second clamping plate are arranged in an overlapping manner, the overlapping length of which is greater than the width of the first clamping plate and the second clamping plate, and the overlapping edges of the adjacent membranes are rolled.

[0014] As a further aspect of the present invention, an air supply system is also included, which is used to supply air to the membrane cavity to maintain the cabinet shape and assist in pressure bearing.

[0015] As a further aspect of the present invention, it also includes a pressure monitoring system and a control system. The pressure monitoring system includes a membrane cavity pressure detection device and a gas storage pressure detection device inside the cabinet. The control system adjusts the output of the air supply system according to the detection results to maintain the stable operation of the gas storage cabinet.

[0016] As a further aspect of the present invention, the effective volume of the gas storage chamber is 20,000 m³ to 150,000 m³, and the working pressure is 2.5 kPa to 4 kPa.

[0017] In a second aspect, the present invention provides an installation method for a novel high-pressure double-membrane gas storage tank as described in the first aspect, comprising the following steps: S1, Construction foundation ring beam; S2. Lay the base film and inner film; S3. Lay out the outer membrane and connect multiple membrane sheets of the outer membrane into a whole using a flexible connecting device; S4. Install the air supply system, pressure monitoring system, and control system; S5. Perform inflation molding, tension adjustment and sealing test to form a high-pressure double-membrane gas storage tank.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects: 1. This invention improves the traditional double-membrane gas storage tank's load-bearing method, which relies primarily on the overall stress of the membrane material, by setting a flexible connection device between the inside and outside of the outer membrane. This transforms the load-bearing method into a composite load-bearing method where discrete node clamping and continuous membrane surface work together, thereby significantly improving the overall pressure-bearing capacity of the double-membrane gas storage tank. 2. By reserving a gap of several millimeters between adjacent fixed units on the same meridian, the present invention allows the membrane material to release local deformation during expansion, contraction and pressure fluctuations, thus avoiding the problems of local tearing, stress concentration and fatigue failure of the membrane material that are prone to occur when using rigid continuous pressure plates. 3. This invention achieves a working pressure of 2.5kPa to 4kPa and an effective volume range of 20,000 m³ to 150,000 m³ without the need for a large steel outer shell, combining the advantages of ordinary double-membrane gas holders and outer steel inner membrane gas holders in terms of performance. 4. The fixed unit used in this invention is a modular component, which can be prefabricated, transported and assembled on site. The amount of steel consumed is much less than that of the overall outer steel shell structure, resulting in lower overall cost, simpler construction organization and shorter construction period. 5. This invention reduces the work of corrosion protection, weld inspection and long-term maintenance of large-area steel structures, which can reduce the difficulty of later maintenance and operation and maintenance costs. It is suitable for sewage treatment, agricultural biogas, industrial wastewater anaerobic digestion, kitchen waste treatment and other scenarios that require medium and low pressure large volume gas storage. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings: Figure 1 This is a perspective view of the novel high-pressure double-membrane gas storage tank of the present invention (fixed unit not shown). Figure 2 This is a cross-sectional view of the novel high-pressure double-membrane gas storage tank of the present invention (fixed unit not shown). Figure 3 This is a schematic diagram showing the connection of the steel cable structure, fixing unit, and outer membrane in this invention; Figure 4 For the present invention Figure 3 A magnified view of a portion of the image; Figure 5 This is a cross-sectional view of the fixed unit in this invention.

[0020] The attached diagram shows the markings and corresponding component names: 1-Basic ring beam, 11-Inlet and outlet air pipes, 12-Anti-tension pile, 2-Outer membrane, 21-Diaphragm, 211-Rolled edge, 3-Inner membrane, 4-Bottom membrane, 5-Air storage chamber, 6-Intermembrane chamber, 7-Cable structure, 71-Central top plate, 72-Pressure-bearing steel rope, 8-Fixing unit, 81-First clamping plate, 82-Second clamping plate, 821-Fixing seat, 83-Fastening assembly, 9-Gap. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0023] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0024] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0025] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0026] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0027] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces), unless otherwise explicitly specified.

[0028] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 the embodiments of this application and simplifying the description, and are not intended to 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 the embodiments of this application.

[0029] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0030] Please refer to Figures 1 to 5 This application provides a novel high-pressure dual-membrane gas storage tank, comprising a base ring beam 1, an outer membrane 2, an inner membrane 3, a bottom membrane 4, and a flexible connecting device. The outer membrane 2, inner membrane 3, and bottom membrane 4 are all fixed on the base ring beam 1, and a gas storage cavity 5 is formed between the inner membrane 3 and the bottom membrane 4, and an inter-membrane cavity 6 is formed between the outer membrane 2 and the inner membrane 3. The outer membrane 2 includes multiple membrane sheets 21 divided along the meridian, and the multiple membrane sheets 21 are connected into a whole by the flexible connecting device. The flexible connecting device includes a steel cable structure 7 and multiple fixing units 8 distributed along the meridian. A gap 9 is reserved between adjacent fixing units 8 on the same meridian. The steel cable structure 7 is connected to each fixing unit 8. The fixing unit 8 includes a first clamping plate 81, a second clamping plate 82, and a fastening assembly 83. The first clamping plate 81 and the second clamping plate 82 are located on the inner and outer sides of the splicing part of adjacent membrane sheets 21, respectively. The fastening assembly 83 applies a clamping force to the first clamping plate 81 and the second clamping plate 82.

[0031] The lower edges of the inner membrane 3 and outer membrane 2 are respectively sealed to the foundation ring beam 1 to form stable stress boundaries and sealing boundaries. The bottom membrane 4 is laid on the foundation ring beam 1, and the inner membrane 3 and the bottom membrane 4 are connected to form an air storage chamber 5. An inlet and outlet air pipe 11 connected to the air storage chamber 5 is provided on the foundation ring beam 1 for the entry and exit of the gas stored in the cabinet. Both the inner membrane 3 and the outer membrane 2 are made of weather-resistant composite membrane material. An inter-membrane cavity 6 is formed between the outer membrane 2 and the inner membrane 3. This inter-membrane cavity 6 is actually a pressure regulating space. Pressurized air is introduced into the inter-membrane cavity 6 to maintain the shape of the cabinet and assist in pressure bearing.

[0032] The inner membrane 3, like existing conventional double-membrane gas storage tanks, is formed by heat-sealing the individual membrane pieces into a single structure. The outer membrane 2 can be divided into multiple membrane pieces 21 along the warp, and adjacent membrane pieces 21 are connected as a whole by a flexible connecting device. Specifically, multiple fixing units 8 are distributed along the warp direction at the splicing points of adjacent membrane pieces 21. These fixing units 8 use fastening components 83 to apply clamping force to the first clamping plate 81 and the second clamping plate 82, thereby pressing the inner and outer sides of the splicing points of adjacent membrane pieces 21 together to achieve a sealing effect. Simultaneously, a steel cable structure 7 is provided to connect to each fixing unit 8 for pressure bearing.

[0033] Because a gap 9 is reserved between two adjacent fixed units 8 on the same meridian, the membrane material's ductility and overall uniform deformation capacity can be preserved while improving the membrane's fixing strength. Since the aforementioned flexible connection device is located in the force transmission area between the inner and outer sides of the outer membrane 2, the load on the outer membrane 2 under pressure is distributed and transmitted through multiple fixed units 8, and the outer membrane 2 maintains flexible following during gas storage expansion or contraction.

[0034] According to some embodiments of this application, the cable structure 7 includes a central top plate 71 and pressure-bearing steel ropes 72; the central top plate 71 is disposed on the top of the outer membrane 2, and each membrane 21 of the outer membrane 2 is connected to the central top plate 71; there are multiple pressure-bearing steel ropes 72 and they are evenly distributed around the central top plate 71, with the upper end of each pressure-bearing steel rope 72 anchored to the central top plate 71 and the lower end anchored to the foundation ring beam 1, and each pressure-bearing steel rope 72 is connected to all fixed units 8 on each warp.

[0035] The aforementioned central top plate 71 is sealed to the top of each diaphragm 21 of the outer membrane 2. The pressure-bearing steel ropes 72 are evenly distributed circumferentially along the central top plate 71, and their direction is along the meridian. After the upper and lower ends of the pressure-bearing steel ropes 72 are anchored, their positions are precisely at the joints of adjacent diaphragms 21, and each pressure-bearing steel rope 72 is connected to all fixed units 8 on the corresponding meridian. Anchoring components can be pre-installed on the foundation ring beam 1 to facilitate the anchoring operation of the lower ends of the pressure-bearing steel ropes 72.

[0036] The flexible connection device in this application can be understood as a flexible discrete connection structure similar to the force logic of chainmail. Unlike the traditional method of treating a large area of ​​membrane material as a single continuous force-bearing surface, this application uses multiple spaced fixing units 8 to disperse the local force borne by the outer membrane 2 into multiple discrete nodes and transmit it to adjacent membrane areas. Because a gap of several millimeters 9 is maintained between adjacent fixing units 8, the membrane material can still undergo slight extension and deformation compensation during the expansion, contraction, and pressure fluctuations of the cabinet, thereby achieving a balance between strength and flexibility.

[0037] According to some embodiments of this application, the second clamping plate 82 is located outside the outer membrane 2, and a plurality of fixing seats 821 are provided on the second clamping plate 82. The fixing seats 821 have cable holes adapted to the pressure-bearing steel rope 72, and the pressure-bearing steel rope 72 passes through the cable holes. In this application, the first clamping plate 81 is located inside the outer membrane 2, and the pressure-bearing steel rope 72 and the second clamping plate 82 are located outside the outer membrane 2. A plurality of fixing seats 821 are provided on the second clamping plate 82 along the length direction, and the pressure-bearing steel rope 72 passes through the cable holes opened on the fixing seats 821, thereby connecting all fixing units 8 in the same warp direction with the corresponding pressure-bearing steel rope 72 to achieve pressure bearing.

[0038] According to some embodiments of this application, the gap 9 reserved between adjacent fixing units 8 on the same meridian is 1mm to 5mm. The several millimeters of gap 9 reserved between each fixing unit 8 constitutes a flexible buffer joint, used to compensate for the differences in expansion and contraction of the membrane material during radial, circumferential, and axial deformation, avoiding local stress concentration in the membrane material. The several millimeters of gap 9 reserved between each fixing unit 8 ensures that while the fixing units 8 are continuously distributed, they still maintain the necessary local expansion and contraction margin and overall flexibility coordination capability of the membrane material.

[0039] Unlike traditional continuous pressure plates or rigid clamping structures, this application does not seamlessly attach each fixing unit 8, but rather leaves a gap 9 of several millimeters between adjacent fixing units 8. This gap 9 is not an assembly error, but an intentionally formed flexible buffer zone. When the gas storage tank rises during inflation, retracts during deflation, or is subjected to wind loads, snow loads, or temperature deformation, the membrane material can release local elongation and shortening through this gap 9, thereby making the stress on the entire membrane more balanced.

[0040] According to some embodiments of this application, the fastening assembly 83 includes a plurality of anti-loosening bolts spaced apart along the length of the fixing unit 8. These anti-loosening bolts pass through bolt holes on the first clamping plate 81 and the second clamping plate 82 and are then locked with nuts to clamp and fix adjacent diaphragms 21. To prevent loosening under alternating loads, certain anti-loosening measures can be taken, such as one or more combinations of spring washers, self-locking nuts, nylon locking elements, or double nuts, to adapt to the alternating loads and vibrations generated during repeated filling and discharging of the gas storage tank.

[0041] According to some embodiments of this application, adjacent diaphragms 21 between the first clamping plate 81 and the second clamping plate 82 are arranged in an overlapping manner, with the overlap length being greater than the width of the first clamping plate 81 and the second clamping plate 82, and the overlapping edges of the adjacent diaphragms 21 having rolled edges 211. By arranging the adjacent diaphragms 21 in an overlapping manner, it is beneficial to improve the pressing reliability and sealing performance of the first clamping plate 81 and the second clamping plate 82 on the spliced ​​parts of the adjacent diaphragms 21. At the same time, by providing rolled edges 211 at the overlapping edges of the adjacent diaphragms 21, since the rolled edges 211 are located on both sides in the width direction of the clamping plate, the anti-slip capability of the adjacent diaphragms 21 can be improved.

[0042] Specifically, to facilitate the installation of the anti-loosening bolts, holes can be made at the joint of adjacent diaphragms 21. During installation, the anti-loosening bolts pass sequentially through the first clamping plate 81, the hole in the diaphragm 21, and the second clamping plate 82, and are then locked with nuts. It should be noted that the first clamping plate 81 and the second clamping plate 82 in this application can be short flat plates or arc-shaped structures to better conform to the curvature of the cabinet top or side wall. Each fixing unit 8 is preferably installed using a factory prefabrication and on-site assembly method. The material of the clamping plates can be selected from galvanized steel, stainless steel, or corrosion-resistant carbon steel, depending on the design pressure, environmental corrosiveness, and diaphragm specifications.

[0043] According to some embodiments of this application, the dual-membrane gas storage tank further includes an air supply system (not shown in the figure), which supplies air to the intermembrane cavity 6 to maintain the shape of the tank and assist in pressure bearing. In this application, the outer membrane 2 is a pressure-bearing protective membrane used to maintain the shape of the tank and withstand the intermembrane pressure; the inner membrane 3 is a working membrane that forms the effective gas storage cavity 5, used to define the gas storage space. The air supply system continuously supplies air to the intermembrane cavity 6 between the inner membrane 3 and the outer membrane 2 to maintain the formed state of the outer membrane 2 and provide external stable support for the inner membrane 3.

[0044] According to some embodiments of this application, the dual-membrane gas storage tank further includes a pressure monitoring system and a control system (neither shown in the figure). The pressure monitoring system includes a pressure detection device for the intermembrane cavity 6 and a gas storage pressure detection device inside the tank. The control system adjusts the output of the air supply system according to the detection results to maintain the stable operation of the dual-membrane gas storage tank.

[0045] The aforementioned pressure detection device for the intermembrane cavity 6 is used to detect the pressure in the intermembrane cavity 6, and the pressure detection device for the gas storage chamber 5 inside the cabinet is used to detect the pressure in the gas storage chamber 5. Both of these pressure detection devices can be pressure sensors. The control system automatically adjusts the air supply volume of the air supply system based on the detection results of the intermembrane pressure and the gas pressure inside the cabinet, i.e., according to the change in the gas storage volume inside the cabinet and the state of the intermembrane cavity 6, maintaining the intermembrane cavity 6 in a predetermined supported state and controlling the working pressure of the gas storage chamber 5 within the range of 2.5 kPa to 4 kPa. Due to the presence of the flexible connection device, the outer membrane 2 can maintain good geometric stability even under high pressure conditions, avoiding localized bulging, membrane slippage, or stress imbalance that easily occur in ordinary double-membrane gas storage tanks under high-pressure conditions.

[0046] The effective volume of the dual-membrane gas storage tank in this application can be increased from the existing ordinary dual-membrane gas storage tank of 20,000 m³ to the range of 20,000 m³ to 150,000 m³, and the working pressure can be increased from 600 Pa to 800 Pa to 2.5 kPa to 4 kPa. Compared with the external steel and internal membrane gas storage tank, this application does not require a complete steel shell. Under the premise of achieving similar performance, it can significantly reduce the amount of steel used, and the overall cost can be reduced by about 50%. Since it does not require large-scale steel shell fabrication, welding, hoisting and anti-corrosion construction, the construction period is significantly shortened and the construction difficulty is significantly reduced. Compared with ordinary dual-membrane gas storage tanks, it significantly improves the effective volume and pressure bearing capacity while maintaining the advantages of flexible membrane structure.

[0047] The installation method of the novel high-pressure double-membrane gas storage tank described above, provided in this application embodiment, includes the following steps: S1. Construction of foundation ring beam 1. The foundation ring beam 1 can be made of reinforced concrete. To increase the stability of the foundation ring beam 1, anti-uplift piles 12 can be installed on the underside of the foundation ring beam 1.

[0048] S2. Lay the bottom membrane 4 and the inner membrane 3. The bottom membrane 4 is laid on the foundation ring beam 1, and the inner membrane 3 is connected to the bottom membrane 4 to form the gas storage chamber 5.

[0049] S3. Lay out the outer membrane 2 and connect the multiple membrane sheets 21 of the outer membrane 2 into a whole through a flexible connecting device. The lower edge of the outer membrane 2 is connected to the foundation ring beam 1. The membrane sheets 21 of the outer membrane 2 are connected to each other through the fixing unit 8. At the same time, a steel cable structure 7 is set up. After the outer membrane 2 is installed, a membrane cavity 6 is formed between it and the inner membrane 3.

[0050] S4. Install the air supply system, pressure monitoring system, and control system. The air supply system continuously supplies air to the membrane chamber 6 to maintain the cabinet's shape and provide auxiliary pressure resistance. The pressure monitoring system detects the pressure in the membrane chamber 6 and the air storage chamber 5. The control system adjusts the air supply system output based on the pressure detection results to maintain the stable operation of the dual-membrane air storage cabinet.

[0051] S5. Perform inflation molding, tension adjustment and sealing test to form a high-pressure double-membrane gas storage tank.

[0052] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A new type of high pressure double membrane gasholder, characterized in that, The system includes a base ring beam, an outer membrane, an inner membrane, a bottom membrane, and a flexible connecting device. The outer membrane, inner membrane, and bottom membrane are all fixed to the base ring beam, with a gas storage cavity formed between the inner membrane and the bottom membrane, and an inter-membrane cavity formed between the outer membrane and the inner membrane. The outer membrane comprises multiple membrane sheets divided along the warp, and these membrane sheets are connected into a whole by the flexible connecting device. The flexible connecting device includes a steel cable structure and multiple fixing units distributed along the warp. A gap is reserved between adjacent fixing units on the same warp. The steel cable structure is connected to each fixing unit. Each fixing unit includes a first clamping plate, a second clamping plate, and a fastening assembly. The first clamping plate and the second clamping plate are located on the inner and outer sides of the splicing part of adjacent membrane sheets, respectively. The fastening assembly applies a clamping force to the first clamping plate and the second clamping plate.

2. The novel high pressure double membrane gasholder according to claim 1, characterized in that, The cable structure includes a central top plate and pressure-bearing steel ropes; the central top plate is located on top of the outer membrane, and each membrane sheet of the outer membrane is connected to the central top plate; there are multiple pressure-bearing steel ropes that are evenly distributed around the central top plate, with the upper end of each pressure-bearing steel rope anchored to the central top plate and the lower end anchored to the foundation ring beam, and each pressure-bearing steel rope is connected to all fixed units on each warp line.

3. The novel high pressure double membrane gasholder according to claim 2, characterized in that, The second clamping plate is located on the outside of the outer membrane. The second clamping plate is provided with several fixing seats. The fixing seats are provided with cable holes adapted to the pressure-bearing steel rope, and the pressure-bearing steel rope is passed through the cable holes.

4. The novel high pressure double membrane gasholder according to claim 1, characterized in that, The gap between adjacent fixed units on the same meridian is 1mm to 5mm.

5. The novel high-pressure double-membrane gas storage tank according to claim 1, characterized in that, The fastening assembly includes a plurality of anti-loosening bolts arranged at intervals along the length of the fixing unit. The anti-loosening bolts pass through bolt holes on the first clamping plate and the second clamping plate and are locked by nuts to achieve clamping and fixing of adjacent diaphragms.

6. The novel high-pressure double-membrane gas storage tank according to claim 1, characterized in that, The adjacent membranes between the first clamping plate and the second clamping plate are arranged in an overlapping manner, with the overlap length being greater than the width of the first clamping plate and the second clamping plate, and the overlapping edges of the adjacent membranes having rolled edges.

7. The novel high pressure double membrane gasholder according to claim 1, characterized in that, It also includes an air supply system for supplying air to the membrane cavity to maintain the cabinet's shape and assist in pressure resistance.

8. The novel high pressure double membrane gasholder according to claim 7, characterized in that, It also includes a pressure monitoring system and a control system. The pressure monitoring system includes a membrane cavity pressure detection device and a gas storage pressure detection device inside the cabinet. The control system adjusts the output of the air supply system according to the detection results to maintain the stable operation of the gas storage cabinet.

9. The novel high pressure double membrane gasholder according to claim 1, characterized in that, The effective volume of the gas storage chamber is 20,000 m³ to 150,000 m³, and the working pressure is 2.5 kPa to 4 kPa.

10. A method of installing a novel high pressure double membrane gasholder as claimed in claim 8, characterized in that, Includes the following steps: S1, Construction foundation ring beam; S2. Lay the base film and inner film; S3. Lay out the outer membrane and connect multiple membrane sheets of the outer membrane into a whole using a flexible connecting device; S4. Install the air supply system, pressure monitoring system, and control system; S5. Perform inflation molding, tension adjustment and sealing test to form a high-pressure double-membrane gas storage tank.

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