CCUS carbon dioxide underground storage cavity reinforcing structure

Abstract

The utility model discloses a CCUS carbon dioxide underground storage cavity reinforcing structure which comprises three layers of functional composite layered structural bodies forming a cavity, the three layers of functional composite layered structural bodies are respectively an anti-corrosion layer, a buffer layer and a grid type constraint shell from inside to outside, the anti-corrosion layer is in direct contact with a storage medium, and the buffer layer is in direct contact with the grid type constraint shell. The buffer layer is located outside the anti-corrosion layer and can deform in a self-adaptive mode, the grid type restraining shell provides an active restraining force system for the whole, the anti-corrosion layer made of basalt fiber reinforced polymer materials is adopted, the corrosion problem of steel is avoided, and the compressive strength is improved; the buffer layer made of expansive clay and rubber composite materials achieves micro-crack self-repairing and stress self-adaptive adjustment, the grid type constraint shell which is made of carbon fiber materials and exerts prestress constructs an active constraint system, and the corrosion resistance, displacement adaptability and bearing efficiency of the storage cavity are improved. And the safety and the stability of underground storage of carbon dioxide are effectively guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to carbon dioxide underground storage field, specifically, relate to a CCUS carbon dioxide underground storage cavity reinforcing structure. BACKGROUND

[0002] In the CCUS (carbon capture, utilization and storage) technology, the traditional storage cavity structure has some deficiencies when facing carbon dioxide storage environment. For example, the material used for contacting storage medium, such as traditional steel, is prone to electrochemical corrosion in CO2 humid environment, which seriously affects the service life and safety of the cavity. The rigid buffer layer is difficult to adapt to the displacement change under complex geological conditions, which is easy to cause structural damage. In addition, the traditional passive support system has stress hysteresis problem, and cannot timely and effectively cope with the complex stress borne by the storage cavity.

[0003] How to invent a CCUS carbon dioxide underground storage cavity reinforcing structure to improve these problems has become a problem to be solved by the technical personnel in the field. UTILITY MODEL CONTENT

[0004] In order to make up for the above deficiencies, the utility model provides a CCUS carbon dioxide underground storage cavity reinforcing structure, which aims at improving the problems of traditional carbon dioxide underground storage cavity, such as easy electrochemical corrosion, difficult to adapt to complex geological conditions and easy to cause structural damage, and passive support system stress hysteresis.

[0005] The utility model is realized as follows: a CCUS carbon dioxide underground storage cavity reinforcing structure, comprising three layers of functional composite layered structure constituting the cavity, the three layers of functional composite layered structure are anticorrosion layer, buffer layer and grid type constraint shell from inside to outside, the anticorrosion layer directly contacts the storage medium, the buffer layer is located at the outside of the anticorrosion layer and can self-adaptively deform, the grid type constraint shell provides active constraint force system to the whole, the top surface of the buffer layer is provided with a plurality of connecting pipelines connected to the inside of the anticorrosion layer, and the top end of each connecting pipeline extends to the outside of the grid type constraint shell through the gap provided on the grid type constraint shell.

[0006] In a preferred technical scheme of the utility model, the anticorrosion layer is basalt fiber reinforced polymer material.

[0007] In a preferred technical scheme of the utility model, the buffer layer is expanded clay and rubber composite material.

[0008] In a preferred technical scheme of the utility model, the grid type constraint shell is carbon fiber material.

[0009] In a preferred technical scheme of the utility model, the grid type constraint shell includes hoop, axial muscle and oblique muscle, the hoop is spirally arranged along the axial direction of cavity, the number of axial muscle is multiple and is spirally arranged along the axial direction of cavity and is evenly distributed in the form of ring with the center of cavity as the center, the number of oblique muscle is multiple and is divided into two groups, the two groups of oblique muscle are mirror image distributed and are spirally extended and crossed with the axial direction of cavity.

[0010] In a preferred technical scheme of the utility model, the buffer layer is internally embedded with a monitoring layer, and the monitoring layer is an optical fiber sensor network.

[0011] In a preferred technical scheme of the utility model, the grid type constraint shell is externally provided with a plurality of hoop reinforcing ribs, the plurality of hoop reinforcing ribs are spaced apart on the outside of the grid type constraint shell, the cross section of each hoop reinforcing rib is isosceles trapezoidal, and the length of one side of the grid type constraint shell is greater than the length of the other side.

[0012] The utility model discloses a CCUS carbon dioxide underground storage cavity reinforcing structure, which has the advantages that the corrosion problem of steel is avoided and the compressive strength is improved by adopting the basalt fiber reinforced polymer material anticorrosive layer, the buffer layer of swelling clay and rubber composite material realizes microcrack self-repair and stress self-adaptive adjustment, the grid type constraint shell of carbon fiber material and pre-stress is used to construct an active constraint system, the corrosion resistance, displacement adaptability and bearing efficiency of the storage cavity are improved, and the safety and stability of carbon dioxide underground storage are effectively ensured. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as a limitation to the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of the drawings.

[0014] Fig. 1 It is the overall structure schematic perspective drawing provided by the embodiment of the utility model;

[0015] Fig. 2 It is the overall structure schematic perspective drawing provided by the embodiment of the utility model;

[0016] Fig. 3 It is the overall structure schematic perspective drawing provided by the embodiment of the utility model;

[0017] Fig. 4The utility model provides a whole cross section structure diagrammatic perspective drawing of annular reinforcing rib.

[0018] In the drawing: 1 - anticorrosive layer; 2 - buffer layer; 3 - grid type constraint shell; 4 - connecting pipeline; 5 - annular reinforcing rib; 301 - annular rib; 302 - axial rib; 303 - oblique rib. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantage of the utility model embodiment clearer, the following will combine the drawings in the utility model embodiment to clearly and completely describe the technical scheme in the utility model embodiment, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0020] Please refer to Figs. 1 to 4 The utility model provides a kind of technical scheme: a CCUS carbon dioxide underground storage cavity reinforcing structure, including three layers of function composite layered structure of the cavity, three layers of function composite layered structure are anticorrosive layer 1, buffer layer 2 and grid type constraint shell 3 from inside to outside respectively, anticorrosive layer 1 directly contacts storage medium, buffer layer 2 is located at the outside of anticorrosive layer 1 and can be self-adapting deformation, grid type constraint shell 3 provides initiative constraint force system to whole, buffer layer 2 top surface is provided with several connecting pipelines 4 connected to the inside of anticorrosive layer 1, and the top of each connecting pipeline 4 extends to the outside of grid type constraint shell 3 by the gap provided on grid type constraint shell 3.

[0021] Further, anticorrosive layer 1 is basalt fiber reinforced polymer material.

[0022] Anticorrosive layer 1 is basalt fiber reinforced polymer material. Vacuum assisted resin infusion molding process is adopted, the acid resistance of basalt fiber is utilized, the electrochemical corrosion problem of traditional steel in CO2 humid environment is overcome, and the compressive strength is improved.

[0023] Further, buffer layer 2 is composite material of swelling clay and rubber.

[0024] Buffer layer 2 is composite material of swelling clay and rubber. Swelling montmorillonite accounts for 12-15%, and rubber matrix is styrene-butadiene rubber, and honeycomb cavity structure (pore diameter 10mm, wall thickness 2mm) is pre-placed in layer, and temperature adaptability is-30 DEG C~80 DEG C to keep elasticity. Microcrack self-repairing and stress self-adapting adjustment are realized by clay and rubber composite, and the displacement upper limit of relative traditional rigid buffer layer is improved.

[0025] Further, the grid type constraint shell 3 is made of carbon fiber material.

[0026] T700 grade carbon fiber bundle is used, 12K filament bundle specification, and prestress is applied. The node uses three-dimensional weaving + nano SiO2 modified epoxy resin curing. The active constraint system is constructed by carbon fiber grid to avoid the stress lag defect of traditional passive support.

[0027] Further, the grid type constraint shell 3 includes hoop ribs 301, axial ribs 302 and oblique ribs 303. The hoop ribs 301 are spirally arranged along the axial direction of the cavity. The axial ribs 302 are evenly distributed in a ring shape around the center of the cavity. The oblique ribs 303 are divided into two groups and are spirally extended at an angle of 45° to the axial direction of the cavity.

[0028] The prestress of the three-direction ribs is different. The prestress of the hoop ribs 301 is the largest, the prestress of the axial ribs 302 is the second, and the prestress of the oblique ribs 303 is the smallest. By spatially weaving the three-direction ribs, an anisotropic reinforcing system is formed to optimize the bearing efficiency under complex stress state.

[0029] Further, the buffer layer 2 is embedded with a monitoring layer, which is an optical fiber sensor network.

[0030] Armored grating optical fiber is used, and the layout mode is serpentine wiring. The monitoring parameters are strain, temperature and acoustic emission. A distributed optical fiber sensing network is integrated to realize real-time and global monitoring of the structure health state.

[0031] Further, the grid type constraint shell 3 is externally provided with a plurality of hoop reinforcing ribs 5. The plurality of hoop reinforcing ribs 5 are distributed at intervals outside the grid type constraint shell 3. The cross section of each hoop reinforcing rib 5 is isosceles trapezoidal, and the length of one side of the trapezoidal cross section facing the grid type constraint shell 3 is greater than the length of the other side.

[0032] The connection mode of the plurality of hoop reinforcing ribs 5 and the grid type constraint shell 3 is carbon fiber bundle binding combined with nano aluminum sol adhesion. The trapezoidal cross section reinforcing rib optimizes the hoop stiffness distribution and reduces the peeling of the rectangular rib.

[0033] Working principle: The whole storage cavity is composed of anticorrosion layer 1, buffer layer 2 and grid type constraint shell 3, the anticorrosion layer 1 directly contacted with the storage medium adopts basalt fiber reinforced polymer material, utilizes its acid resistance to effectively resist the electrochemical corrosion of CO2 humid environment, at the same time, enhances the compressive strength, and protects the internal structure. The buffer layer 2 is composed of swelling clay and rubber composite material, and a honeycomb cavity structure is pre-set in the buffer layer 2, when the cavity is displaced or stressed due to the change of geological conditions, the swelling clay and rubber composite material can realize microcrack self-repairing and stress self-adaptive adjustment. The grid type constraint shell 3 adopts carbon fiber material and prestress, and through the spatial weaving of the hoop, axial and inclined three-directional ribs, an active constraint system is formed, different prestress settings optimize the bearing efficiency under the complex stress state, and stress lag is avoided. The optical fiber sensor network monitoring layer in the buffer layer monitors the parameters such as strain, temperature and acoustic emission in real time, and feeds back the structure health state. The external hoop stiffening rib utilizes the isosceles trapezoidal section to optimize the hoop stiffness distribution, reduces the peeling risk, and the parts jointly act, so that the carbon dioxide underground storage cavity is safe and stable in operation.

[0034] The preferred embodiments of the utility model are described above only, and are not used for limiting the utility model, for the person skilled in the art, the utility model can have various changes and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A CCUS carbon dioxide underground storage cavity reinforcement structure comprising a three-layered functional composite layered structure body constituting a cavity, characterized by, The three-layer functional composite layered structure is composed of an anticorrosion layer, a buffer layer and a grid type constraint shell from inside to outside, the anticorrosion layer directly contacts the storage medium, the buffer layer is located outside the anticorrosion layer and can self-adaptively deform, the grid type constraint shell provides an active constraint force system for the whole, the top surface of the buffer layer is provided with a plurality of connecting pipelines connected to the inside of the anticorrosion layer, and the top end of each connecting pipeline extends to the outside of the grid type constraint shell through the gap provided on the grid type constraint shell.

2. The CCUS carbon dioxide underground storage cavern reinforcement structure of claim 1, wherein: The anticorrosion layer is made of basalt fiber reinforced polymer material.

3. The CCUS carbon dioxide underground storage cavern reinforcement structure of claim 1, wherein: The buffer layer is made of swelling clay and rubber composite material.

4. The CCUS carbon dioxide underground storage cavern reinforcement structure of claim 1, wherein: The grid type constraint shell is made of carbon fiber material.

5. The CCUS carbon dioxide subsurface storage cavern reinforcement structure of claim 1, wherein: The grid type constraint shell comprises hoop ribs, axial ribs and oblique ribs, the hoop ribs are spirally arranged along the axial direction of the cavity, the number of the axial ribs is multiple and the axial ribs are evenly distributed in the form of a ring with the center of the cavity as the center, and the number of the oblique ribs is multiple and the oblique ribs are divided into two groups, the two groups of oblique ribs are mirror distributed and spirally extended at an angle of 45° with the axial direction of the cavity.

6. The CCUS carbon dioxide underground storage cavern reinforcement structure of claim 1, wherein: The buffer layer is embedded with a monitoring layer, and the monitoring layer is an optical fiber sensor network.

7. The CCUS carbon dioxide underground storage cavern reinforcement structure of claim 1, wherein: The grid type constraint shell is provided with a plurality of hoop reinforcing ribs outside, the plurality of hoop reinforcing ribs are distributed at intervals outside the grid type constraint shell, the cross section of each hoop reinforcing rib is isosceles trapezoidal, and the length of one side of the hoop reinforcing rib is greater than the length of the other side toward the grid type constraint shell.

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