CN-121993220-A - Compression energy storage cavity sealing structure based on dilatant material and construction method

CN121993220ACN 121993220 ACN121993220 ACN 121993220ACN-121993220-A

Abstract

The invention discloses a compression energy storage cavity sealing structure based on a dilatant material and a construction method, wherein the sealing structure comprises a plurality of flexible membrane units which are continuously spliced along the axial direction and/or the circumferential direction of the cavity and attached to the inner surface of the cavity lining, the spliced edges of the adjacent flexible membrane units are sealed and fixed on the inner wall of the cavity lining through a plurality of pressing mechanisms, each flexible membrane unit is formed by compounding an outer flexible membrane material, an inner flexible membrane material and a three-dimensional space grid framework clamped between the outer flexible membrane material and the inner flexible membrane material, the edges of the outer flexible membrane material and the inner flexible membrane material extend outwards relative to the three-dimensional space grid framework, and the dilatant fluid material is filled in a hollow structure inside the three-dimensional space grid framework. The sealing structure can effectively avoid joint sinking failure caused by the cracking of the lining of the cavity, is suitable for deformation under the circulation, and ensures that the sealing layer is densely filled and accurately installed by matching with the construction method of the prefabricated section and the reserved filling opening, thereby remarkably improving the long-term sealing reliability and construction quality of the compressed air energy storage cavity.

Inventors

HU JUNQING
JIN SHENGYAO
WEN RUI
XIA CAICHU
ZHANG FANGYONG
Ye Yihang
LIU YINYONG

Assignees

上海勘测设计研究院有限公司
宁波大学

Dates

Publication Date: 20260508
Application Date: 20260327

Claims (10)

1. The utility model provides a pressure gas energy storage cavity seal structure based on dilatant material, its characterized in that includes a plurality of gentle membrane unit, a plurality of gentle membrane unit splice in succession along cavity axial and/or hoop and laminate in cavity lining internal surface, and the concatenation limit of adjacent gentle membrane unit seals and is fixed in cavity lining inner wall through a plurality of hold-down mechanism, every gentle membrane unit is by outer gentle membrane material, inlayer gentle membrane material and the three-dimensional space grid skeleton complex between the two of clamp locate, the edge of outer gentle membrane material and inlayer gentle membrane material outwards extends for three-dimensional space grid skeleton, the dilatant fluid material has been filled in the hollow structure of three-dimensional space grid skeleton inside, dilatant fluid material is the fluid state when shear stress is less than the threshold value, is the solid state when being higher than the threshold value to avoid invagination seam inefficacy because of cavity lining crack leads to.
2. The compressed air energy storage cavity sealing structure based on dilatant materials according to claim 1, wherein the three-dimensional space grid framework is a grid structure with a hollow filling core layer, and the outer layer flexible membrane material and the inner layer flexible membrane material are respectively single-layer or multi-layer.
3. The compressed air energy storage cavity sealing structure based on dilatant materials according to claim 1 or 2, wherein the three-dimensional space grid framework is made of high-density polyethylene, the outer layer flexible membrane material and the inner layer flexible membrane material are woven by one or more of plastic coated cloth, fiber cloth or woven cloth, and the outer layer flexible membrane material and the inner layer flexible membrane material are compounded with the three-dimensional space grid framework in a thermal bonding mode.
4. The compressed air energy storage cavity sealing structure based on a dilatant material according to claim 1, wherein the dilatant fluid material is a nano silica-polyethylene glycol dispersion system or a starch-water system dilatant fluid material.
5. The compressed air energy storage cavity sealing structure based on dilatant materials according to claim 1, wherein the flexible membrane units are designed in a segmented or full-circle mode according to the cavity size, and the outer flexible membrane materials and the inner flexible membrane materials extending from the edges of the flexible membrane units are used for lap joint sealing between the adjacent flexible membrane units.
6. The compressed air energy storage cavity sealing structure based on dilatant materials according to claim 1, wherein each pressing mechanism comprises a first pressing strip prefabricated part, a second pressing strip prefabricated part and a connecting piece, the first pressing strip prefabricated part is fixed on a cavity lining, the first pressing strip prefabricated part presses the inner surface of the edge of the outer-layer flexible membrane material, the second pressing strip prefabricated part presses the inner surface of the edge of the inner-layer flexible membrane material, the connecting piece penetrates through a corresponding flexible membrane unit, and two ends of the connecting piece are respectively clamped with the corresponding first pressing strip prefabricated part and the corresponding second pressing strip prefabricated part.
7. The compressed air energy storage cavity sealing structure based on dilatant material according to claim 6, wherein the first pressing strip prefabricated member comprises a first pressing strip and an anchoring portion which are integrally arranged, the first pressing strip is pressed against the inner surface of the edge of the outer flexible membrane material, the anchoring portion is embedded and fixed on the cavity lining, a first clamping groove is formed in the first pressing strip prefabricated member, the first clamping groove penetrates through the first pressing strip and extends into the anchoring portion, the second pressing strip prefabricated member comprises a second pressing strip, a second clamping groove is formed in one side of the second pressing strip, and two ends of the connecting piece are respectively embedded in the first clamping groove and the second clamping groove.
8. The dilatant material-based pneumatic energy storage cavity sealing structure according to claim 7, wherein waterproof adhesive tapes are respectively arranged between the first pressing strip and the edge of the outer-layer flexible membrane material and between the second pressing strip and the edge of the inner-layer flexible membrane material.
9. The inflatable material-based pneumatic energy storage cavity sealing structure according to claim 8, wherein the waterproof adhesive tape arranged between the first pressing strip and the edge of the outer flexible membrane material is a whole circle of waterproof adhesive tape, and the waterproof adhesive tape arranged between the second pressing strip and the edge of the inner flexible membrane material is a whole circle of waterproof adhesive tape.
10. A method of constructing a dilatant material based pneumatic energy storage cavern seal structure as claimed in any one of claims 1 to 9 comprising the steps of: S1, prefabricating a plurality of base sections of a three-dimensional space grid framework attached to the inner wall of a cavity lining according to the inner diameter size of the cavity lining; S2, respectively cutting an outer-layer flexible membrane material and an inner-layer flexible membrane material according to the size of each base section, and compositing the outer-layer flexible membrane material and the inner-layer flexible membrane material on the inner surface and the outer surface of each base section to form a plurality of flexible membrane units; S3, elastic line positioning is carried out on the inner surface of the lining of the cavity, a plurality of flexible membrane units are continuously attached to the inner surface of the lining of the cavity along the axial direction and/or the circumferential direction of the cavity, the splicing edges of adjacent flexible membrane units are aligned, partial splicing edges of the adjacent flexible membrane units are sealed and fixed through a partial compression mechanism, in the fixing process, the splicing seams of the reserved partial splicing edges are temporarily not fixed, and are used as a plurality of filling ports and a plurality of exhaust ports, and a continuous flexible membrane circular ring bag structure is formed after the fixation; S4, filling the dilatant fluid material into the flexible membrane annular bag structure in a segmented mode through a plurality of filling openings, and sealing and fixing the residual splicing edges of the adjacent flexible membrane units through a residual pressing mechanism after the dilatant fluid material is uniformly filled; And S5, after the whole section of the chamber is filled, performing secondary sealing treatment on the splicing seams of all the splicing edges.

Description

Compression energy storage cavity sealing structure based on dilatant material and construction method Technical Field The invention belongs to the technical field of underground energy storage, and particularly relates to a compressed air energy storage cavity sealing structure based on a dilatant material and a construction method. Background The large-scale energy storage technology is a key for realizing the efficient utilization of renewable energy sources, and can push the energy source structure to be converted into clean low carbon. Among them, the compressed air energy storage technology is regarded as one of the most potential physical energy storage technologies due to the advantages of large capacity, low cost, long service life, environmental friendliness and the like. In this technology, how to ensure that the gas in the underground gas storage cavern does not leak or the leakage amount is controlled within an allowable range is a key problem. For this purpose, a lining cavity structure composed of a sealing layer, a concrete lining and surrounding rocks has been developed. In this structure, the surrounding rock mainly bears the gas storage pressure, the lining is used for sharing and transmitting the pressure, and the sealing layer plays a core sealing role. The sealing layer mainly comprises a steel lining and a flexible sealing, wherein the steel lining sealing is realized by paving a steel plate with a certain thickness on the inner wall of the lining. Since the steel lining is a rigid structure, the steel lining bears a larger load under the condition that surrounding rock conditions are not good, and the corresponding design thickness is large, which causes a large increase in construction cost. The flexible sealing is mainly realized by flexible sealing materials with good air tightness and large deformability, such as flexible sealing materials. Compared with the steel lining sealing mode, the flexible sealing mode has a larger development prospect, but under the long-term temperature and internal pressure circulation effect, the mechanical property and air tightness of the flexible sealing material are deteriorated, so that the service life of the flexible sealing material is shortened. In order to solve the problem, the method mainly starts from two aspects, namely, a sealing material with better high-temperature resistance is adopted, and a temperature control measure is started when the system temperature is too high. These methods can alleviate the sealing problem to some extent. However, under high pressure gas storage conditions, the concrete lining inevitably develops cracks due to the tensile strength of the concrete being far exceeded by the internal pressure induced hoop tensile stress. Once the lining structure is cracked, the flexible sealing layer is very easy to squeeze into cracks under the drive of high internal pressure, so that the failure of the cracks is induced, and the sealing function is lost. Although the limited crack design can be adopted in the structural design stage, the maximum crack width of the lining is effectively controlled to reduce the risk of sealing failure, the design is realized by enhancing the rigidity of the lining, which can lead the lining to bear more load proportion originally shared by surrounding rocks, weakens the bearing potential of the surrounding rocks and further causes the risk of secondary failure of the lining structure. Disclosure of Invention In order to solve the problem of seam trapping failure caused by lining cracking of a flexible sealing layer in a complicated service environment of an underground gas storage cavity, the invention provides a sealing structure of a compressed gas energy storage cavity and a construction method, which have high safety and high efficiency and are novel in material system; by matching the construction method of the prefabricated section and the reserved filling opening, the sealing layer is ensured to be densely filled and accurately installed, and the reliability and construction quality of long-term sealing of the compressed air energy storage cavity are obviously improved. The pressure air energy storage cavity sealing structure based on the dilatant material comprises a plurality of flexible membrane units, the flexible membrane units are continuously spliced and attached to the inner surface of a cavity lining along the axial direction and/or the circumferential direction of the cavity, the spliced edges of the adjacent flexible membrane units are sealed and fixed on the inner wall of the cavity lining through a plurality of pressing mechanisms, each flexible membrane unit is formed by compounding an outer flexible membrane material, an inner flexible membrane material and a three-dimensional space grid framework clamped between the outer flexible membrane material and the inner flexible membrane material, the edges of the outer flexible membrane material and the inner flexible membr