A gas storage reservoir

Abstract

The present invention discloses a gas storage reservoir, which relates to the technical field of artificial gas storage reservoirs. The present invention provides a gas storage reservoir combined with a dam, which is formed by at least combining an in-dam gas storage reservoir and a shoulder gas storage reservoir. The in-dam gas storage reservoir is arranged in the dam body of a hydropower station project dam, and the shoulder gas storage reservoir is arranged in the mountain bodies on both banks of the dam body. As a part of the overall gas storage reservoir, the in-dam gas storage reservoir is constructed by leveraging the geographical advantages and concrete structure advantages during the construction of the hydropower station. It uses the massive concrete of the dam itself as a support, which can not only withstand the high pressure in the gas storage reservoir, but also effectively reduce the construction difficulty of the gas storage reservoir and significantly save the engineering investment of the gas storage reservoir.

Description

Technical Field

[0001] The present invention relates to the technical field of artificial gas storage reservoirs, and in particular to a gas storage reservoir. Background Art

[0002] Compressed air energy storage is a new type of energy storage method at present. It compresses air to more than 10 MPa at a low electricity price during the low electricity consumption period, and uses the compressed air to generate electricity during the peak electricity consumption period to earn the price difference.

[0003] A gas storage reservoir is a key building for realizing compressed air energy storage. At present, artificial caverns are mostly excavated in underground rocks as gas storage reservoirs to store compressed air. Excavating artificial caverns in underground rocks requires a large burial depth to withstand the pressure in the gas storage reservoir. However, too large a burial depth often results in great construction difficulty and long construction period, thus also leading to a significant increase in project cost, which is not conducive to the popularization and application of underground gas storage reservoir technology.

[0004] Currently, many energy bases are comprehensive energy bases integrating multiple energy sources such as hydropower, wind power, photovoltaic and energy storage. For example, the dam of a hydropower station project is built in high mountain and canyon areas, and the dam body is located between high and steep mountain bodies on both sides. Moreover, the dam of the hydropower station project is mostly built of concrete, creating natural conditions for the construction of an artificial gas storage reservoir. Summary of the Invention

[0005] The purpose of the present invention is to provide a gas storage reservoir that can be used for storing compressed air. By utilizing the construction characteristics of the dam of a hydropower station project and adopting the method of jointly constructing a gas storage reservoir in the dam body and the mountain body, the construction difficulty of the underground gas storage reservoir can be effectively reduced, and the project investment can be greatly reduced, thereby solving the problems of great construction difficulty and high project cost existing in the existing underground excavation of artificial caverns.

[0006] To achieve the above purpose, the present invention provides the following solution:

[0007] The present invention provides a gas storage reservoir, which is at least jointly formed by an in-dam gas storage reservoir and a shoulder gas storage reservoir, wherein:

[0008] The in-dam gas storage reservoir is opened in the dam body of the hydropower station project dam;

[0009] The shoulder gas storage reservoir is opened in at least one of the two mountain bodies on both sides of the dam body, and the shoulder gas storage reservoir is communicated with the in-dam gas storage reservoir;

[0010] An air charging and discharging pipeline is arranged on at least one of the in-dam gas storage reservoir and the shoulder gas storage reservoir.

[0011] Optionally, it further includes a reconstructed gas storage reservoir, which is opened in the temporary underground building of the abandoned water conservancy and hydropower project; the reconstructed gas storage reservoir is communicated with at least one of the in-dam gas storage reservoir and the abutment gas storage reservoir.

[0012] Optionally, the abutment gas storage reservoirs are opened in the mountains on both banks of the dam body, and the reconstructed gas storage reservoir is communicated with the abutment gas storage reservoir in one of the mountains through a gas storage reservoir communication channel.

[0013] Optionally, the in-dam gas storage reservoir is arranged near the bottom of the dam body, and the thickness of the concrete of the dam body at the top and both sides of the in-dam gas storage reservoir is not less than 10m.

[0014] Optionally, an inspection gallery connected to the in-dam gas storage reservoir is opened in the dam body. A plug is arranged at the intersection of the in-dam gas storage reservoir and the inspection gallery. The plug divides the in-dam gas storage reservoir into two mutually spaced parts; the charging and discharging pipeline is buried in the plug. The charging and discharging pipeline has at least three pipeline openings, at least one of which extends into the inspection gallery, at least one of which extends into the in-dam gas storage reservoir at one end of the plug, and at least one of which extends into the in-dam gas storage reservoir at the other end of the plug.

[0015] Optionally, when the rock of the mountain is hard rock, the burial depth of the abutment gas storage reservoir is at least 110m; when the rock of the mountain is soft rock, the burial depth of the abutment gas storage reservoir is at least 200m.

[0016] Optionally, steel bars are buried around the in-dam gas storage reservoir.

[0017] Optionally, a sealing layer is arranged on the inner wall of the in-dam gas storage reservoir; the inner walls of the abutment gas storage reservoir and the reconstructed gas storage reservoir are sequentially provided with a concrete lining layer and a sealing layer from outside to inside.

[0018] Optionally, the cross-section of the cave of the in-dam gas storage reservoir is circular or elliptical; the cross-section of the cave of the abutment gas storage reservoir is circular or elliptical; the cross-section of the cave of the reconstructed gas storage reservoir is circular or elliptical.

[0019] Optionally, at least one of the in-dam gas storage reservoir, the abutment gas storage reservoir and the reconstructed gas storage reservoir is internally provided with a temperature control device to control the temperature in the gas storage reservoir.

[0020] Optionally, the temperature control device is a cooling device.

[0021] Optionally, the cooling device includes a plurality of annular cooling pipes filled with cooling water inside, and the annular cooling pipes are spaced along the length extension direction of the in-dam gas storage reservoir, the abutment gas storage reservoir and the reconstructed gas storage reservoir.

[0022] Optionally, the interval T0 between any two adjacent ones of the annular cooling pipes is 2 m to 5 m.

[0023] The present invention achieves the following technical effects compared with the prior art:

[0024] The gas storage reservoir proposed by the present invention is a combined dam and reservoir gas storage reservoir, which is formed by at least combining an in-dam gas storage reservoir and a shoulder gas storage reservoir. The in-dam gas storage reservoir is arranged in the dam body of the hydropower project dam, and the shoulder gas storage reservoir is arranged in the mountain bodies on both sides of the dam body. As a part of the overall gas storage reservoir, the in-dam gas storage reservoir is constructed by taking advantage of the geographical advantages and concrete structure advantages during the construction of the hydropower station. It uses the large-volume concrete of the dam itself as a support, which can not only resist the high pressure in the gas storage reservoir, but also effectively reduce the construction difficulty of the gas storage reservoir and greatly save the engineering investment of the gas storage reservoir.

[0025] In some technical solutions disclosed by the present invention, the gas storage reservoir further includes a reconstructed gas storage reservoir, and the reconstructed gas storage reservoir is arranged in the abandoned temporary underground buildings of the water conservancy and hydropower project, such as diversion tunnels, temporary ecological water discharge tunnels, etc. Usually, these temporary buildings have a relatively deep buried depth and have the conditions to be used as underground gas storage reservoirs. The present invention utilizes the abandoned temporary underground buildings during the construction of water conservancy and hydropower projects to solve the effective buried depth of the underground gas storage reservoir, and further reduces the construction difficulty and project cost of the deep underground gas storage reservoir. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a schematic diagram of the overall structure of the gas storage reservoir disclosed in the embodiment of the present invention;

[0028] Figure 2 It is Figure 1 the A-A sectional view of the plug shown in

[0029] Figure 3 It is Figure 1 the B-B sectional view of the in-dam gas storage reservoir shown in

[0030] Figure 4 It is Figure 1 the C-C sectional view of the shoulder gas storage reservoir shown in

[0031] Figure 5 It is Figure 1 the D-D sectional view of the reconstructed gas storage reservoir shown in

[0032] Among them, the reference numerals are as follows:

[0033] 100 - gas storage reservoir;

[0034] 1 - dam body; 2 - mountain body; 3 - dam - shoulder gas storage reservoir; 4 - in - dam gas storage reservoir; 5 - plug; 6 - concrete lining layer; 7 - annular cooling pipeline; 8 - gas charging and discharging pipeline; 81 - transverse pipeline; 82 - longitudinal pipeline; 9 - inspection gallery; 10 - sealing layer; 11 - reconstructed gas storage reservoir; 12 - gas storage reservoir connection channel. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0036] One of the purposes of the present invention is to provide a gas storage reservoir, which can be used for storing compressed air. By utilizing the characteristics of the construction of the dam of a hydropower station project and adopting the method of jointly constructing a gas storage reservoir in the dam body and the mountain body, the construction difficulty of the underground gas storage reservoir can be effectively reduced, and the project investment can be greatly reduced, thereby solving the problems of large construction difficulty and high project cost existing in the existing underground - excavated artificial caverns.

[0037] In order to make the above - mentioned objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] Embodiment 1

[0039] As Figure 1 shown, this embodiment provides a gas storage reservoir 100, which is at least jointly formed by the in - dam gas storage reservoir 4 and the dam - shoulder gas storage reservoir 3. The in - dam gas storage reservoir 4 is opened in the dam body 1 of the hydropower station project dam, and both ends of the in - dam gas storage reservoir 4 extend and are arranged towards the mountain bodies 2 on both sides; at least one of the two mountain bodies 2 on both sides of the dam body 1 is provided with a dam - shoulder gas storage reservoir 3, that is, a dam - shoulder gas storage reservoir 3 can be opened only in the mountain body 2 on one side of the dam body 1. Specifically, a dam - shoulder gas storage reservoir 3 can be opened only in Figure 1 the left - hand mountain body 2 as Figure 1 shown, or a dam - shoulder gas storage reservoir 3 can be opened only in Figure 1A dam shoulder gas storage 3 is respectively arranged in the left mountain body 2 and the right mountain body 2 shown in the figure. The dam shoulder gas storage 3 can be built both upstream and downstream of the anti-seepage curtain of the dam. All the dam shoulder gas storage 3 are connected to the in-dam gas storage 4, so as to form a combined gas storage, that is, the gas storage 100. An air charging and discharging pipeline 8 is arranged on the gas storage 100. The air charging and discharging pipeline 8 is used to connect the inside and outside of the gas storage 100, that is, the gas outside the storage can be introduced into the gas storage 100 for storage, and the gas in the gas storage 100 can also be discharged to the outside of the storage. In actual operation, the air charging and discharging pipeline 8 can be arranged only on the in-dam gas storage 4 or only on the dam shoulder gas storage 3, or the air charging and discharging pipeline 8 can be arranged on both the in-dam gas storage 4 and the dam shoulder gas storage 3 at the same time; arranging the air charging and discharging pipeline 8 on both the in-dam gas storage 4 and the dam shoulder gas storage 3 at the same time is more conducive to improving the gas storage or exhaust efficiency of the gas storage 100. The above-mentioned gas storage 100 is essentially a combined gas storage of a reservoir and a dam, which can be used to store compressed air. Moreover, this gas storage is constructed by taking advantage of the geographical advantages and concrete structure advantages during the construction of the hydropower station. It uses the large-volume concrete of the dam itself as the gas storage, which can not only resist the high pressure in the gas storage, but also effectively reduce the construction difficulty of the gas storage and greatly save the project investment of the gas storage; at the same time, it can solve the effective buried depth of the existing underground gas storage, and further reduce the project cost.

[0040] In this embodiment, in addition to the above-mentioned in-dam gas storage 4 and dam shoulder gas storage 3, the gas storage 100 also includes a reconstructed gas storage 11. The reconstructed gas storage 11 is arranged in the abandoned temporary underground building of the water conservancy and hydropower project. In essence, it is reconstructed from the abandoned temporary underground building of the water conservancy and hydropower project, so it is called the "reconstructed gas storage". The reconstructed gas storage 11 is connected to at least one of the in-dam gas storage 4 and the dam shoulder gas storage 3. As Figure 1 shown, in this embodiment, it is preferably that the dam shoulder gas storage 3 is arranged in both mountain bodies 2 on both sides of the dam body 1. The two ends of the in-dam gas storage 4 in the dam body 1 extend to the left and right mountain bodies 2 respectively to be connected to the dam shoulder gas storage 3 in the two mountain bodies 2 respectively. The above-mentioned reconstructed gas storage 11 is connected to the dam shoulder gas storage 3 in one of the mountain bodies 2 through the gas storage connection channel 12, as Figure 1As shown in the figure, the reconstructed gas storage reservoir 11 communicates with the dam shoulder gas storage reservoir 3 in the right mountain body 2. Further, it is preferable that the extending direction of the reconstructed gas storage reservoir 11 is perpendicular to the extending direction of the dam shoulder gas storage reservoir 3. In this solution, the temporary buildings abandoned during the construction of water conservancy and hydropower projects are reconstructed into a part of the gas storage reservoir 100. First, the in-dam gas storage reservoir 4 in the dam body 1 and the reconstructed gas storage reservoir 11 are mostly at the same elevation, and can be directly connected through the dam shoulder gas storage reservoir 3 in the dam shoulder mountain body. The construction is simple, which is conducive to saving the engineering quantity of the gas storage reservoir, and thus saving the project investment. Second, when the capacity of the reconstructed gas storage reservoir 11 is large enough, the dam shoulder gas storage reservoir 3 in the dam shoulder mountain body can be used as a traffic corridor. Third, when the position of the reconstructed gas storage reservoir 11 is relatively low, it can be connected to the dam shoulder gas storage reservoir 3 through a section of gas storage reservoir connecting passage 12, and the construction is simple. During the construction of water conservancy and hydropower projects, a considerable part of the temporary underground buildings such as diversion tunnels and temporary ecological water discharge tunnels are abandoned after their functions are completed. These temporary buildings are often buried deeply and have the conditions to be used as underground gas storage reservoirs. This solution makes full use of them. Generally, after a sealing layer 10 is set in the abandoned diversion tunnel and temporary ecological water discharge tunnel, it can be directly used as the reconstructed gas storage reservoir 11, which not only solves the problem of the burial depth required for artificial caverns, but also effectively reduces the construction difficulty and project cost of the underground gas storage reservoir.

[0041] In this embodiment, the dam of the hydropower station project is generally large in volume and is made of concrete. There is completely enough space inside it to build a gas storage cavern, and it can withstand the pressure above 10 MPa generated by the compressed air in the gas storage reservoir 100. The in-dam gas storage reservoir 4 can be regarded as a reserved corridor in the dam body 1. It uses the large-volume concrete of the dam itself as a support, which can not only resist the high pressure in the gas storage reservoir 100, but also greatly save the project investment of the gas storage reservoir. The in-dam gas storage reservoir 4 is arranged at a lower position of the dam body 1, that is, it is preferably arranged near the bottom of the dam body 1. The main reasons are as follows: First, at the lower position of the dam body 1, the width of the dam body (in the upstream and downstream directions of the dam body) is larger, which will create enough space for building the in-dam gas storage reservoir 4. Second, generally during the construction of water conservancy and hydropower projects, the positions of the temporary buildings excavated in the mountain body are also relatively low, which is convenient for the utilization of the temporary buildings and reduces the connection difficulty between the reconstructed gas storage reservoir 11 in the temporary building and the dam shoulder gas storage reservoir 3. The dam shoulder gas storage reservoir 3 is generally arranged at the same elevation as the in-dam gas storage reservoir 4. During the construction of the dam foundation excavation of the dam body 1, the dam shoulder gas storage reservoir 3 connected to the in-dam gas storage reservoir 4 can be directly excavated on the mountain bodies 2 on both sides without excavating vertical shafts or inclined shafts, reducing the construction difficulty of the dam shoulder gas storage reservoir 3.

[0042] In this embodiment, the thickness of the concrete of the dam body at the top and on both sides of the gas storage reservoir 4 in the dam is not less than 10 m, that is, the minimum distances from the gas storage reservoir 4 in the dam to the top of the dam body 1, the upstream surface of the dam body 1, and the downstream surface of the dam body 1 are 10 m, so as to ensure that there is a thick enough concrete layer reserved around the gas storage reservoir 4 in the dam to resist the high pressure in the gas storage reservoir 100. The smaller the thickness of the concrete of the dam body at the bottom of the gas storage reservoir 4 in the dam is, the better, but generally not less than 5 m, that is, the minimum distance from the gas storage reservoir 4 in the dam to the bottom of the dam is 5 m, so as to ensure the strength of the bottom of the gas storage reservoir 4 in the dam.

[0043] Furthermore, in this embodiment, steel bars can be embedded in the concrete around the gas storage reservoir 4 in the dam to ensure that there are no cracks or fewer cracks in the concrete around the gas storage reservoir 4. The steel bars are preferably in the form of an arc-shaped steel bar structure adapted to the outer contour of the gas storage reservoir 4 in the dam.

[0044] In this embodiment, a maintenance corridor 9 connected to the gas storage reservoir 4 in the dam is provided in the dam body 1, and the maintenance corridor 9 extends from the upstream side to the downstream side of the dam body 1. A plug 5 is provided at the position where the gas storage reservoir 4 in the dam intersects with the maintenance corridor 9. The plug 5 divides the gas storage reservoir 4 in the dam into two spaced left and right parts. As Figure 1 shown, the part of the gas storage reservoir 4 in the dam on the left side of the plug 5 is communicated with the dam shoulder gas storage reservoir 3 in the left mountain body 2, and the part of the gas storage reservoir 4 in the dam on the right side of the plug 5 is communicated with the dam shoulder gas storage reservoir 3 in the right mountain body 2. Preferably, only one set of gas charging and discharging pipelines 8 is provided and buried in the plug 5. The gas charging and discharging pipelines 8 have at least three pipeline openings, at least one of which penetrates the side wall of the gas storage reservoir 4 in the dam and extends into the maintenance corridor 9, at least one of which penetrates the left end of the plug 5 and extends into the gas storage reservoir 4 in the dam on the left side of the plug 5, and at least one of which penetrates the right end of the plug 5 and extends into the gas storage reservoir 4 in the dam on the right side of the plug 5. In this solution, the plug 5 is formed by casting concrete, and the gas charging and discharging pipelines 8 are buried in the plug 5 and communicate with the gas storage reservoir 4 at both ends of the plug 5 to achieve pressure balance at both ends of the plug 5; this structural arrangement of only providing one plug 5 in the gas storage reservoir 4 in the dam and burying the gas charging and discharging pipelines 8 in the plug 5 can greatly shorten the length of the plug. Compared with the plugs of conventional underground gas storage reservoirs, a large amount of concrete can be saved and the cost can be reduced.

[0045] Furthermore, the gas charging and discharging pipelines 8 can specifically be in the structures such as a three-way pipeline, a four-way pipeline, or a five-way pipeline, etc. Taking the gas charging and discharging pipelines 8 as a three-way pipeline as an example, as Figure 2As shown in the figure, the gas charging and discharging pipeline 8 includes a transverse pipeline 81 and a longitudinal pipeline 82. The transverse pipeline 81 is buried in the plug 5 and extends along the length direction of the dam-internal gas storage 4. Both ends of the transverse pipeline 81 penetrate through the left and right ends of the plug 5 respectively to realize the connection with the dam-internal gas storage 4 on both sides of the plug 5; the longitudinal pipeline 82 intersects with the transverse pipeline 81. One end of the longitudinal pipeline 82 is buried in the plug 5 and communicated with the transverse pipeline 81, and the other end of the longitudinal pipeline 82 penetrates through the side wall of the dam-internal gas storage 4 and extends into the maintenance corridor 9. As a further preferred solution, the longitudinal pipeline 82 is perpendicular to the transverse pipeline 81 and is connected to the middle of the transverse pipeline 81, that is, the gas charging and discharging pipeline 8 as a whole is a T-shaped tee pipeline. In actual use, a control valve can be set at any pipeline port of the gas charging and discharging pipeline 8 to control the opening and closing and the opening degree of each pipeline port of the gas charging and discharging pipeline 8.

[0046] In this embodiment, when the rock of the mountain body 2 is hard rock, the burial depth of the dam shoulder gas storage 3 is at least 110 m; hard rock is a scientific and technical term in highway transportation announced in 1996, usually including granite, andesite, basalt, quartzite, gneiss, etc., and the compressive strength is often above 60 MPa. When the rock of the mountain body 2 is soft rock, the burial depth of the dam shoulder gas storage 3 is at least 200 m; soft rock refers to loose, soft, weak rock layers with low strength, large porosity, poor cementation degree, being significantly affected by structural planes and weathering or containing a large amount of expansive clay minerals. Such rocks are mostly mudstone, shale, siltstone and argillaceous ore rock, which are natural and complex geological media.

[0047] In this embodiment, a sealing layer 10 can be directly set on the inner wall of the dam-internal gas storage 4. The inner walls of the dam shoulder gas storage 3 and the reconstructed gas storage 11 are sequentially provided with a concrete lining layer 6 and a sealing layer 10 from outside to inside. Here, the concrete lining and sealing operations can be carried out according to the conventional lining and sealing methods of underground artificial gas storages. The sealing layer 10 can prevent the gas stored in the gas storage 100 from leaking, and the sealing layer 10 is generally made of thin steel plates, flexible concrete, acrylate, etc.

[0048] In this embodiment, the cross-section of the reservoir hole of the dam-internal gas storage 4 is circular or oval; the cross-section of the reservoir hole of the dam shoulder gas storage 3 is circular or oval; the cross-section of the reservoir hole of the reconstructed gas storage 11 is circular or oval. Setting the cross-section of the gas storage reservoir hole as circular or oval has good stress conditions and is beneficial to the structural safety of the gas storage.

[0049] In this embodiment, at least one of the in-dam gas storage 4, the abutment gas storage 3, and the reconstructed gas storage 11 is internally provided with a temperature control device to control the temperature inside the gas storage 100, mainly to prevent the temperature inside the gas storage 100 from being too high. Preferably, the temperature control device is specifically a cooling device, which includes a temperature detection device and a number of annular cooling pipes 7. The temperature detection device can be a thermometer or a temperature sensor, which is arranged in at least one of the in-dam gas storage 4, the abutment gas storage 3, and the reconstructed gas storage 11 to monitor the temperature inside the gas storage 100 in real time. The number of annular cooling pipes 7 are spaced along the length extension direction of the in-dam gas storage 4, the abutment gas storage 3, and the reconstructed gas storage 11. All the annular cooling pipes 7 can be connected to the same water inlet pipe and the same water outlet pipe at the same time, and all the annular cooling pipes 7 together form a cooling water circulation device; or each annular cooling pipe 7 has an independent water inlet pipe and a water outlet pipe, and each annular cooling pipe 7 forms a cooling water circulation device respectively; or, at least two adjacent annular cooling pipes 7 are connected to the same water inlet pipe and the same water outlet pipe at the same time, and the whole system forms a plurality of cooling water circulation devices. This structure is more conducive to the sectional temperature control of the gas storage 100. In this embodiment, it is preferred that all the annular cooling pipes 7 are connected to the same water inlet pipe and the same water outlet pipe at the same time, that is, all the annular cooling pipes 7 together form a cooling water circulation device. Corresponding water pumps and valves can be configured on the water inlet pipe and the water outlet pipe to control the on-off and flow rate of the coolant in the annular cooling pipes 7, and further adjust the temperature and the cooling rate inside the gas storage 100.

[0050] Furthermore, the above cooling device can use the deep water part of the reservoir where the dam 1 is located as the circulating cooling medium. The temperature of the deep water part of the reservoir is generally between 4°C and 6°C, and the water temperature is relatively low. When the compressed air inside the gas storage 100 is compressed, the temperature rises. If not controlled, it may rise above 100°C, which is not conducive to the durability of the buildings inside the gas storage 100 during long-term operation. By using the low-temperature reservoir water to circulate in the annular cooling pipes 7, the temperature inside the gas storage 100 can be effectively reduced, which is beneficial to the durability of the structure inside the gas storage 100. The annular cooling pipes 7 are arranged on the inner surface of the sealing layer 10 and are arranged along the contour of the cavity of the gas storage 100; the interval T0 between any two adjacent annular cooling pipes 7 inside the gas storage 100 is 2m to 5m, and it can be locally densified, and the specific tightness can be adjusted according to actual use requirements.

[0051] For high dams in water conservancy and hydropower projects, that is, the dam 1 is generally built in a canyon between high and steep mountain bodies 2 on both sides. The height of the mountain bodies 2 on both sides reaches several hundred meters or even more than a thousand meters. When building the dam 1 of a water conservancy and hydropower project, the gas storage 100 can be built by using the dam 1 concrete, the mountain bodies 2 on both sides, and the abandoned temporary underground buildings of the water conservancy and hydropower project. The gas storage 100 has the following advantages:

[0052] (1) The combined gas storage method of reservoir and dam can not only utilize the abandoned temporary buildings during the construction of water conservancy and hydropower projects to solve the effective burial depth of underground gas storage caverns, but also reduce the construction difficulty of deep underground gas storage caverns and the project cost of gas storage caverns.

[0053] (2) The underground gas storage cavern that can be used as a compressed air energy storage power station: The concrete dams of hydropower station projects are generally large in volume and are built of concrete. There is completely enough space inside to build gas storage caverns, and they can withstand the pressure above 10 MPa generated by the compressed air in the gas storage caverns.

[0054] (3) By using the characteristics of the construction of dams in hydropower station projects and adopting the combined gas storage cavern construction method of underground gas storage cavern and gas storage cavern built inside the dam, the construction difficulty of gas storage caverns can be effectively reduced and the project investment can be greatly reduced.

[0055] (4) By using deep reservoir water to cool the gas storage cavern, the temperature inside the gas storage cavern can be effectively reduced, which is beneficial to the durability of the structure inside the gas storage cavern. The heat-exchanged reservoir water can also be discharged back into the reservoir, realizing the recycling of low-cost resources, which is beneficial to energy conservation and environmental protection.

[0056] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0057] Specific examples are used in the present invention to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, there will be changes in the specific implementation manner and application scope according to the idea of the present invention. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A gas storage reservoir, characterized in that, It is formed by at least the combination of an in-dam gas storage reservoir and a shoulder gas storage reservoir, where: The in-dam gas storage reservoir is arranged within the dam body of the hydropower project dam; The shoulder gas storage reservoir is arranged in at least one of the two mountain bodies on both banks of the dam body, and the shoulder gas storage reservoir communicates with the in-dam gas storage reservoir; An air charging and discharging pipeline is arranged on at least one of the in-dam gas storage reservoir and the shoulder gas storage reservoir.

2. The gas storage reservoir according to claim 1, characterized in that, It further includes a reconstructed gas storage reservoir, which is arranged within the temporary underground building of the abandoned water conservancy and hydropower project; the reconstructed gas storage reservoir communicates with at least one of the in-dam gas storage reservoir and the shoulder gas storage reservoir.

3. The gas storage reservoir according to claim 2, characterized in that, The shoulder gas storage reservoir is arranged in both of the mountain bodies on both banks of the dam body, and the reconstructed gas storage reservoir communicates with the shoulder gas storage reservoir in one of the mountain bodies through a gas storage reservoir communication channel.

4. The gas storage reservoir according to any one of claims 1 to 3, characterized in that, The in-dam gas storage reservoir is arranged near the bottom of the dam body, and the concrete thickness of the dam body at the top and both sides of the in-dam gas storage reservoir is not less than 10 m.

5. The gas storage reservoir according to any one of claims 1 to 3, characterized in that An inspection gallery connected to the in-dam gas storage reservoir is arranged within the dam body. A plug is arranged at the intersection of the in-dam gas storage reservoir and the inspection gallery, and the plug divides the in-dam gas storage reservoir into two mutually spaced parts; the air charging and discharging pipeline is buried within the plug, and the air charging and discharging pipeline has at least three pipeline openings, where at least one pipeline opening extends into the inspection gallery, at least one pipeline opening extends into the in-dam gas storage reservoir at one end of the plug, and at least one pipeline opening extends into the in-dam gas storage reservoir at the other end of the plug.

6. The gas storage reservoir according to any one of claims 1 to 3, characterized in that, When the rock of the mountain body is hard rock, the burial depth of the shoulder gas storage reservoir is at least 110 m; when the rock of the mountain body is soft rock, the burial depth of the shoulder gas storage reservoir is at least 200 m.

7. The gas storage reservoir according to any one of claims 1 to 3, characterized in that, Reinforcing bars are buried around the in-dam gas storage reservoir.

8. The gas storage reservoir according to claim 2 or 3, characterized in that, A sealing layer is arranged on the inner wall of the in-dam gas storage reservoir; the inner walls of the shoulder gas storage reservoir and the reconstructed gas storage reservoir are sequentially provided with a concrete lining layer and a sealing layer from outside to inside.

9. The gas storage reservoir according to claim 2 or 3, characterized in that, The cross-section of the reservoir cavity of the in-dam gas storage reservoir is circular or oval; the cross-section of the reservoir cavity of the shoulder gas storage reservoir is circular or oval; the cross-section of the reservoir cavity of the reconstructed gas storage reservoir is circular or oval.

10. The gas storage reservoir according to claim 2 or 3, characterized in that, A temperature control device is arranged inside at least one of the in-dam gas storage reservoir, the shoulder gas storage reservoir and the reconstructed gas storage reservoir to control the temperature inside the gas storage reservoir.

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