Compressed gas energy storage device and construction process

Abstract

The application discloses a compressed gas energy storage device and a construction process, which comprises a vertical shaft and a gas storage chamber. The vertical shaft is arranged on the upper portion of the gas storage chamber and is used for connecting the gas storage chamber with the outside. The application further comprises a support component which is arranged inside a rock mass for support. The support component comprises a plurality of connecting blocks which are connected in a head-tail mode to form a ring shape. The gas storage chamber is arranged in the ring shape, and a grouting channel is arranged in the connecting block. The above structure of the application applies a prestress greater than the working pressure of the hole body to the hole body in advance, so that the flexible rock mass completes the limit deformation in advance. After the limit deformation occurs, the grouting channel of the connecting block is grouted, the support structure is fixed, and then the deformation of the flexible rock mass is fixed, so that the underground gas storage device will not occur repeatedly during normal operation, and the adverse effects of the repeated deformation of the flexible rock mass on the underground gas storage device are avoided.

Description

Technical Field

[0001] This invention relates to the field of compressed gas energy storage technology in flexible rock formations, and more specifically, to a compressed gas energy storage device and its construction process. Background Technology

[0002] Compressed air energy storage refers to an energy storage method that uses electrical energy to compress air during periods of low grid load, sealing the air at high pressure in abandoned mines, submerged seabed gas tanks, caves, expired oil and gas wells, or newly built gas wells, and releasing the compressed air to drive a steam turbine to generate electricity during periods of high grid load.

[0003] The main problem currently facing the installation of gas storage devices in flexible rock masses is that when the gas storage device is filled with gas, the surrounding rock mass will be squeezed and deformed as the pressure increases, expanding outward as a whole. When the internal pressure of the gas storage device decreases, the surrounding rock mass will expand inward as the pressure decreases. This cyclical change will cause the support system of the gas storage device and the surrounding soil to lose stability in the repeated changes, and eventually the system will collapse due to the combined effects of stress concentration and other phenomena. Therefore, current underground gas storage systems are all set up in hard rock strata to avoid this risk. However, construction in hard rock strata will lead to higher costs. Therefore, it is necessary to propose a solution that can be used in flexible rock strata to reduce construction costs and overcome the problems mentioned above to a certain extent. Summary of the Invention

[0004] The purpose of this invention is to provide a compressed gas energy storage device and construction process to solve the problem that the use of gas storage devices in flexible rock formations in the prior art is prone to collapse.

[0005] The embodiments of the present invention are achieved through the following technical solutions:

[0006] A compressed gas energy storage device includes a vertical shaft and a gas storage chamber. The vertical shaft is disposed above the gas storage chamber and is used to connect the gas storage chamber to the outside. It also includes a support member, which is used to be disposed inside the rock mass for support.

[0007] The supporting component includes several annular connecting units, which are spliced ​​together along a circular path to form the gas storage chamber. Each connecting unit includes several connecting blocks, which are connected end-to-end to form the connecting unit. Each connecting block is provided with a grouting channel, which is used to fix two adjacent connecting blocks during the grouting process.

[0008] In one embodiment of the present invention, the connecting block includes a first splicing block, and a plurality of first semi-circular through holes are provided on both sides of the first splicing block.

[0009] In one embodiment of the present invention, two first semi-circular through holes are respectively opened on both sides of the first splicing block.

[0010] In one embodiment of the present invention, a circular hole is provided on one side of the first splicing block.

[0011] In one embodiment of the present invention, the connecting unit includes two second splicing blocks, a plurality of third splicing blocks and a plurality of fourth splicing blocks, wherein the second splicing blocks and the plurality of third splicing blocks are disposed on the same layer, and the fourth splicing blocks and the plurality of third splicing blocks are disposed on another layer adjacent to the second splicing blocks;

[0012] Each of the two second splicing blocks has a second semi-circular through hole at one end, and the two second splicing blocks with the second semi-circular through holes are connected at one end. Several third splicing blocks are respectively connected to the other ends of the two second splicing blocks, and a drainage hole is provided in the middle of the fourth splicing block.

[0013] The second, third, and fourth splicing blocks each have a diversion hole that runs through the center in an arc direction.

[0014] In one embodiment of the present invention, each of the second and third splicing blocks is provided with two of the aforementioned diversion holes in the middle.

[0015] In one embodiment of the present invention, an asphalt mortar layer, a glass glue layer and a rubber sealing layer are sequentially provided on the inner side of the connecting block, and a sensor is also provided inside the connecting block for collecting the deformation of the supporting component.

[0016] In one embodiment of the present invention, the asphalt mortar layer is 19-21 mm thick, and the rubber sealing layer is 14-16 mm thick.

[0017] A construction process for a compressed gas energy storage device, comprising the compressed gas energy storage device as described in claim 7, further comprising:

[0018] S101: Excavate a space in flexible rock mass to house a gas storage chamber;

[0019] S102: Several connecting blocks are set in the above space, and the connecting blocks form a gas storage chamber;

[0020] S103: Apply asphalt mortar, glass glue and rubber sealing layer sequentially to the inner wall of the gas storage chamber to form a sealing layer;

[0021] S104: When the first connecting block is used, the grouting system is connected to the two pre-joined first semi-circular through holes through the sealing layer; when the second and third connecting blocks are used, the grouting system is connected to the two pre-joined second semi-circular through holes.

[0022] S105: After the overall sealing is completed, pressurize the gas storage chamber with air. Based on the deformation data collected by the pre-embedded sensor and the pressure data in the gas storage chamber, grout is injected into the connecting block to apply prestress.

[0023] In one embodiment of the present invention, step S105 further includes:

[0024] Grouting begins when the working pressure inside the gas storage chamber exceeds 15%.

[0025] When the pre-applied pressure reaches 20% of the working pressure, the grouting pressure reaches its maximum value. Maintain this maximum grouting pressure until one hour after the grouting material has set. If the grouting pressure does not decrease during this period, slowly reduce the grouting pressure until work is stopped.

[0026] The pressure inside the gas storage chamber is maintained at 20%. When the strength of the grouting material reaches 80%, the pressure inside the gas storage chamber is reduced to normal atmospheric pressure at a rate of no more than 5% per hour to complete the application of prestress.

[0027] The technical solutions of the embodiments of the present invention have at least the following advantages and beneficial effects:

[0028] The structure described above using this invention mainly includes a support structure, a shaft, and a gas storage chamber. The support components include several connecting units, and each connecting unit includes several connecting blocks. A grouting channel is provided within the connecting block to fill the connecting block with cement slurry, thereby fixing the entire support structure. By inflating and pressurizing the gas storage chamber, a prestress greater than the working pressure of the cavern is applied to the cavern body in advance, allowing the flexible rock mass to undergo ultimate deformation beforehand. After the ultimate deformation occurs, grout is injected into the grouting channel of the connecting block, fixing the support structure and thus fixing the deformation of the flexible rock mass. This ensures that during normal operation, the underground gas storage device will no longer experience repeated strain, avoiding the adverse effects of repeated deformation of the flexible rock mass on the underground gas storage device. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the connection unit using the first splicing block in this invention;

[0031] Figure 2 This is a schematic diagram of the connection unit structure using the second and third splicing blocks in this invention;

[0032] Figure 3 This is a schematic diagram of the connection unit structure using the fourth and third splicing blocks in this invention;

[0033] Figure 4 This is a front view schematic diagram of the repeating unit in Embodiment 3 of the present invention;

[0034] Figure 5 This is a schematic diagram of the structure of the first splicing block of the present invention;

[0035] Figure 6 This is a schematic diagram of the structure of the second splicing block of the present invention;

[0036] Figure 7 This is a cross-sectional schematic diagram of the second splicing block of the present invention;

[0037] Figure 8 This is a schematic diagram of the structure of the third splicing block of the present invention;

[0038] Figure 9 This is a cross-sectional schematic diagram of the third splicing block of the present invention;

[0039] Figure 10 This is a schematic diagram of the structure of the fourth splicing block of the present invention;

[0040] Figure 11 This is a cross-sectional schematic diagram of the fourth splicing block of the present invention;

[0041] Figure 12 This is a plan view of the gas storage chamber and the vertical shaft of the present invention;

[0042] Figure 13 This is a vertical schematic diagram of the gas storage chamber and shaft of the present invention;

[0043] Figure 14 This is a cross-sectional schematic diagram of the gas storage chamber of the present invention;

[0044] Icons: 1-First splicing block, 2-Second splicing block, 3-Third splicing block, 4-First semi-circular through hole, 5-Circular hole, 6-Diverting hole, 7-Second semi-circular through hole, 8-Gas storage chamber, 9-Vertical shaft, 10-Drainage hole, 11-Fourth splicing block. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0046] Example 1:

[0047] Please refer to Figure 1 , Figures 12-14 The present invention provides a compressed gas energy storage device, including a vertical shaft 9 and a gas storage chamber 8. The gas storage chamber 8 is used to store high-pressure gas and is connected to the vertical shaft 9. The rest of the gas storage chamber 8 is sealed. Gas outlet and gas inlet are both completed through the vertical shaft 9. At the same time, the vertical shaft 9 can also serve as a necessary passage during construction.

[0048] It also includes support components set in the rock strata. The support components mainly provide support for the entire device. The support components are composed of several ring-shaped connecting units. Each connecting unit is composed of several arc-shaped connecting blocks. Several connecting blocks are connected end to end to form a ring structure. Then, several ring-shaped connecting units are installed and spliced ​​along a circular path to finally form a ring-shaped hollow gas storage chamber 8, in which high-pressure gas is stored.

[0049] Several connecting blocks are equipped with grouting channels inside. Cement grout is injected into all connecting blocks through the grouting channels to fix the connecting blocks in place.

[0050] The structure of the present invention mainly includes a support structure, a vertical shaft 9, and a gas storage chamber 8. The support structure includes several connecting units, and each connecting unit includes several connecting blocks. Grouting channels are provided in the connecting blocks. After the gas storage chamber 8 is completely sealed, gas is introduced into the gas storage chamber 8 to increase the pressure. A prestress greater than the working pressure of the cave is applied to the cave body in advance, so that the flexible rock mass completes the ultimate deformation in advance. After the ultimate deformation occurs, grout is injected into the grouting channels of the connecting blocks, and the support structure is fixed, thereby fixing the deformation of the flexible rock mass. This ensures that the underground gas storage device will no longer experience repeated strain during normal operation, avoiding the adverse effects of repeated deformation of the flexible rock mass on the underground gas storage device.

[0051] Example 2:

[0052] refer to Figure 1 and Figure 5 Based on Embodiment 1, more specifically regarding the connecting unit, the connecting unit includes several first splicing blocks 1, the first splicing blocks 1 being an arc-shaped structure, so that several first splicing blocks 1 can be connected to form a ring structure.

[0053] A first semi-circular hole 5 is provided on both sides of the first splicing block 1, so that when two adjacent first splicing blocks 1 are connected, a complete circular hole 5 can be formed. The circular hole 5 is mainly used for grouting work, so that two adjacent first splicing blocks 1 can be fixedly connected.

[0054] In this embodiment, two first semi-circular holes 5 are respectively opened on both sides of the first splicing block 1. In this way, when splicing, two complete through holes are formed on both sides of the first splicing block 1. One through hole is a grouting channel for grouting, and the other through hole is used for venting, which is conducive to better injecting cement grout between the two first splicing blocks 1.

[0055] In addition, a circular hole 5 is provided on one side of the first splicing block 1. This diversion hole 6 is also used for venting to prevent air from being squeezed between the first connecting block and the rock wall, which would cause the first connecting block to not fit tightly with the rock wall.

[0056] Example 3:

[0057] refer to Figures 2-4 , Figures 6-11 Based on Embodiment 1, another structure for the connecting unit is provided. In this embodiment, the connecting unit is a two-layer structure, including two second splicing blocks 2, several third splicing blocks 3 and several fourth connecting blocks. The second splicing blocks 2 and several third splicing blocks 3 are in the same layer, and the fourth connecting blocks and several other third splicing blocks 3 are in another layer. The two-layer structure is a repeating unit, which is installed sequentially.

[0058] The second, third, and fourth connecting blocks have roughly similar structures, all being arc-shaped block structures. Two second connecting blocks 2 are connected at one end with the second semi-circular through hole 7. Several third connecting blocks 3 are respectively connected to the other ends of the two second connecting blocks 2, forming one layer of the ring structure. The remaining several third connecting blocks are connected to both sides of the fourth connecting block, forming another layer of the ring structure.

[0059] One end of the second splicing block 2 has a second semi-circular through hole 7. When two second splicing blocks 2 are connected, the two second semi-circular through holes 7 can form a complete through hole, which serves as the grouting channel for the structure provided in this embodiment. The fourth splicing block 11 has a drainage hole 10 in the middle, which also serves as a grouting channel. It should be noted that the through hole formed by the two second semi-circular through holes 7 must be aligned with the drainage hole 10 of the fourth splicing block 11.

[0060] The second splicing block 2, the third splicing block 3, and the fourth splicing block 11 each have two diversion holes 6 inside. These diversion holes 6 connect to both sides of the second splicing block 2 or the third splicing block 3. Thus, when the second splicing block 2 and the third splicing block 3 are installed into a complete arc shape, the internal diversion holes 6 will also form a complete ring. Similarly, when the fourth splicing block 11 and the remaining third splicing blocks 3 are installed into a complete arc shape, the internal diversion holes 6 will also form a complete ring.

[0061] By injecting grout into the grouting hole formed by the second semi-circular through hole 7 of the two second splicing blocks 2, the cement grout will reach each second splicing block 2 and third splicing block 3 along the diversion hole 6, and the cement grout will continue to flow into the drainage hole 10 of the fourth splicing block 11, so that the cement grout flows to the fourth splicing block 11 and the third splicing block 3 located in the same layer of the fourth splicing block 11. After the cement grout solidifies, all the second splicing blocks 2 and third splicing blocks 3, the fourth connecting block and the third splicing block 3 are connected into a whole.

[0062] This embodiment has a simpler structure than embodiment two and can be formed by one-time injection. The two embodiments can be selected according to construction needs.

[0063] Example 4:

[0064] Based on Embodiments 1, 2, and 3, an asphalt mortar layer, a glass glue layer, and a rubber sealing layer are sequentially arranged on the inner side of the connecting block. A sensor is also installed inside the connecting block to collect the deformation of the supporting component. More specifically, the asphalt mortar layer is 19-21 mm thick, and the rubber sealing layer is 14-16 mm thick.

[0065] Example 5:

[0066] As shown in the figure, based on Embodiment 4, the present invention also provides a construction process for a compressed gas energy storage device, including the aforementioned compressed gas energy storage device, and further comprising:

[0067] First, the underground gas storage device is formed in the flexible rock mass using shield tunneling, and a space for setting up the gas storage chamber 8 is excavated in the flexible rock mass.

[0068] Several connecting blocks are set up in the aforementioned space, and the connecting blocks enclose the gas storage chamber 8.

[0069] Apply asphalt mortar, glass glue, and rubber sealing layer sequentially to the inner wall of gas storage chamber 8 to form a sealing layer;

[0070] When the first connecting block is used, the grouting system passes through the sealing layer and connects to one of the two sets of first semi-circular through holes 4 that are spliced ​​together. The other set of two first semi-circular through holes 4 is connected to the air pump. When the second and third connecting blocks are used, the grouting system is connected to the two sets of second semi-circular through holes 7 that are spliced ​​together.

[0071] S105: After the overall sealing is completed, pressurize the air storage chamber 8 with air. Based on the deformation data collected by the pre-embedded sensor and the pressure data in the air storage chamber 8, grout is injected into the connecting block to apply prestress.

[0072] More detailed information regarding the grouting process is as follows:

[0073] Grouting begins when the working pressure inside gas storage chamber 8 exceeds 15%.

[0074] When the pre-applied pressure reaches 20% of the working pressure, the grouting pressure reaches its maximum value. Maintain this maximum grouting pressure until one hour after the grouting material has set. If the grouting pressure does not decrease during this period, slowly reduce the grouting pressure until work is stopped.

[0075] The internal pressure of the gas storage chamber 8 is maintained at 20%. When the strength of the grouting material reaches 80%, the pressure inside the gas storage chamber 8 is reduced to normal atmospheric pressure at a rate of no more than 5% per hour to complete the application of prestress.

[0076] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. 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 construction process for a compressed gas energy storage device, characterized by, The compressed gas energy storage device comprises a shaft (9) and a gas storage chamber (8), the shaft (9) is arranged on the upper part of the gas storage chamber (8), the shaft (9) is used for connecting the gas storage chamber (8) with the outside, and the support member is arranged inside the rock mass for support, the support member comprises a plurality of annular connection units, the connection units are spliced along a circular path to form the gas storage chamber (8), the connection unit comprises a plurality of connection blocks, the connection blocks are connected in a head-to-tail manner to form the connection unit, a grouting channel is arranged in the connection block, and the grouting channel is used for fixing the adjacent two connection blocks in the grouting process; The connection unit further comprises a first splicing block (1), two second splicing blocks (2), a plurality of third splicing blocks (3) and a plurality of fourth splicing blocks, a plurality of first semicircular through holes (4) are formed on the two sides of the first splicing block (1); The second splicing block (2) and the plurality of third splicing blocks (3) are arranged in the same layer, and the fourth splicing block (11) and the plurality of third splicing blocks (3) are arranged on the other layer of the adjacent second splicing block (2); One end of the two second splicing blocks (2) is provided with a second semicircular through hole (7), one end of the two second splicing blocks (2) with the second semicircular through hole (7) is connected, the other end of the two second splicing blocks (2) is connected with the plurality of third splicing blocks (3), and the fourth splicing block (11) is provided with a drainage hole (10) in the middle part; The second splicing block (2), the third splicing block (3) and the fourth splicing block are provided with a shunt hole (6) penetrating in the arc direction in the middle part, and further comprising: S101: a space for arranging the gas storage chamber (8) is excavated in the flexible rock mass by using a shield machine; S102: a plurality of connection blocks are arranged in the space, and the connection blocks are arranged to form the gas storage chamber (8); S103: an asphalt mortar layer, glass glue and a rubber sealing layer are sequentially applied to the inner wall of the gas storage chamber (8) to form a sealing layer; S104: when the connection block adopts the first splicing block (1), the grouting system is connected with the two spliced first semicircular through holes (4) through the sealing layer; when the connection block adopts the second splicing block (2) and the third splicing block (3), the grouting system is connected with the two spliced second semicircular through holes (7); S105: after the overall sealing is completed, the gas storage chamber (8) is inflated and pressurized, the grouting into the connection block is performed according to the deformation data collected by the pre-embedded sensor and the pressure data in the gas storage chamber (8), and the pre-stress is applied; the gas storage chamber (8) is inflated and pressurized, the pre-stress greater than the working pressure of the hole body is applied to the hole body in advance, the flexible rock mass is deformed in advance, after the limit deformation occurs, the grouting channel of the connection block is grouted, the support structure is fixed, and then the deformation of the flexible rock mass is fixed.

2. The construction process of a compressed gas energy storage device according to claim 1, characterized in that, The step S105 further comprises: When the internal working pressure of the gas storage chamber (8) exceeds 15% or more, the grouting is started. The grouting pressure reaches the maximum value when the pre-applied pressure reaches 20% of the working pressure, and the grouting pressure is slowly reduced to stop working when the grouting pressure does not decrease for one hour after the grouting material reaches the final setting; The internal pressure of the gas storage chamber (8) is maintained at 20%, and when the strength of the grouting material reaches 80%, the pressure in the gas storage chamber (8) is reduced to normal atmospheric pressure at a speed of not more than 5% per hour, and the application of prestress is completed.

3. The construction process of a compressed gas energy storage device according to claim 2, wherein Two first semicircular through holes (4) are arranged on the two sides of the first splicing block (1).

4. The construction process of a compressed gas energy storage device according to claim 3, wherein A circular hole (5) is arranged on one side of the first splicing block (1).

5. The construction process of a compressed gas energy storage device according to claim 4, wherein, Two shunt holes (6) are arranged in the middle of each second splicing block (2) and third splicing block (3).

6. The construction process of a compressed gas energy storage device according to any one of claims 1-5, characterized in that, The inner side of the connecting block is sequentially provided with an asphalt mortar layer, glass glue and a rubber sealing layer, and a sensor is further arranged in the connecting block, and the sensor is used to collect the deformation amount of the supporting member.

7. The construction process of a compressed gas energy storage device according to claim 6, wherein The asphalt mortar layer is 19-21mm, and the rubber sealing layer is 14-16mm.

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