An underground gas storage reservoir and compressed air energy storage power station based on mountain terrain

Abstract

The present invention discloses an underground gas storage reservoir and a compressed air energy storage power station based on mountain terrain, and relates to the field of compressed air energy storage technology. The underground gas storage reservoir based on mountain terrain includes at least one group of gas storage caverns, all of which are buried in the mountain; it also includes a construction passage, which is a flat tunnel excavated from the construction passage entrance located at the waist of the mountain to the inside of the mountain, and all the gas storage caverns are continuously excavated into the mountain through the construction passage; the elevation of the gas storage cavern is greater than the elevation of the construction passage entrance. The present invention solves the technical problem that the existing underground gas storage reservoir and compressed air energy storage power station construction requires the special construction of drainage and ventilation structures, resulting in a long construction period, and has the technical effect of facilitating drainage and ventilation and shortening the project construction period.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to an underground gas storage reservoir and a compressed air energy storage power station based on mountain terrain. Background Art

[0002] Compressed air energy storage power stations use compressed air energy storage systems to generate electricity. Compressed air energy storage systems are a technology that uses compressed air to store energy. When storing energy, an electric motor drives a multi-stage compressor to compress the air to high pressure and store it in a gas storage device, completing the conversion of electrical energy to air pressure energy. When releasing energy, the compressed air is released from the gas storage device and passed into a multi-stage expander to perform work, completing the conversion of air pressure energy to electrical energy. One way to implement a gas storage device is to build an underground artificial cavern, namely an underground gas storage, which has the advantage of a large gas storage capacity and is more suitable for large-scale compressed air energy storage systems.

[0003] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: Since underground gas storage is a medium-high pressure gas storage device, the currently built underground gas storage is constructed in the form of a vertical shaft. In order to ensure that the surrounding rock can bear a certain stress and remain stable during the operation of the gas storage, the excavation of the vertical shaft must basically reach a certain depth. As the depth of the vertical shaft increases, the problems of difficult drainage and poor ventilation and smoke exhaust in the vertical shaft become more and more obvious, and corresponding supporting facilities need to be constructed. Therefore, the construction of existing underground gas storage generally has the problem of a long construction period. Summary of the invention

[0004] The object of the present invention is to provide an underground gas storage based on mountain terrain which can shorten the construction period.

[0005] To achieve this goal, on the one hand, an underground gas storage facility based on mountain terrain is provided, comprising at least one group of gas storage caverns, all of which are buried in the mountain; and also comprising a construction passage, wherein the construction passage is a flat tunnel excavated from a construction passage entrance located at the waist of the mountain to the inside of the mountain, and all of the gas storage caverns are further excavated into the mountain through the construction passage; the elevation of the gas storage caverns is greater than the elevation of the construction passage entrance.

[0006] Furthermore, the elevation of the construction passage gradually increases from the entrance of the construction passage to the gas storage cavern.

[0007] Furthermore, the elevation of the gas storage cavern near the construction passage is lower than the elevation of the gas storage cavern far from the construction passage.

[0008] Furthermore, after the construction of the gas storage cavern is completed, a gas charging and discharging pipeline is laid in the construction channel.

[0009] Furthermore, a connecting tunnel is provided inside the gas storage cavern, and the connecting tunnel serves as a construction and transportation passage when the gas storage cavern is constructed. A blocking body is provided on the connecting tunnel after the construction of the gas storage cavern is completed.

[0010] Furthermore, one end of the connecting tunnel is connected to the middle position of the gas storage cavern, and the gas storage cavern extends to both sides from the connection point between the connecting tunnel and the gas storage cavern.

[0011] Furthermore, during the construction of the gas storage cavern, an assembly station is also provided in the gas storage cavern, and the assembly station is located at both ends of the connecting tunnel.

[0012] Furthermore, after the construction of the gas storage cavern is completed, a sealing door is provided on the gas storage cavern, and the blocking body is located on a side of the sealing door away from the gas storage cavern.

[0013] On the other hand, a compressed air energy storage power station is also provided, comprising a ground plant area and an underground gas storage reservoir based on mountain terrain as described in any of the above items, wherein the elevation of the underground gas storage reservoir based on mountain terrain is greater than the elevation of the ground plant area.

[0014] Furthermore, the entrance of the construction channel is also located at the lower part of the mountain. The construction channel is arranged inside the mountain from bottom to top. The entrance of the construction channel is arranged close to the compressor unit and the expansion unit. The compressor unit and the expansion unit are located in the ground plant.

[0015] One of the above technical solutions has the following advantages or beneficial effects: The underground gas storage of the present invention is constructed based on the mountain terrain, and the natural elevation difference of the mountain is used to form the required burial depth of the gas storage cavern. When constructing the underground gas storage of the present invention, an entrance to the construction channel is excavated at a position close to the side wall of the mountain, a construction channel is excavated from the entrance to the inside of the mountain, and a gas storage cavern is excavated from the other end of the construction channel to the inside of the mountain. The construction channel is a flat tunnel. The excavation technology of the flat tunnel is mature and the construction speed is fast. Moreover, compared with the existing vertical shaft, the flat tunnel can also improve the smoke exhaust and drainage conditions in the construction area of ​​the gas storage cavern. In the underground gas storage of the present invention, the elevation of the gas storage cavern is greater than the elevation of the entrance of the construction channel. Compared with the prior art, the construction steps of the smoke exhaust and drainage structure are reduced.

[0016] In summary, the underground gas storage based on mountain terrain of the present invention has the advantages of fast construction speed and short construction period. The compressed air energy storage power station of the present invention is built on the mountain. Due to the above-mentioned underground gas storage based on mountain terrain, the construction period of the project is greatly shortened compared with similar projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a compressed air energy storage power station;

[0018] Figure 2 This is a schematic diagram of the structure of an underground gas storage facility based on mountain terrain.

[0019] In the figure: 10-ground plant area; 20-underground gas storage; 21-gas storage cavern; 22-construction passage; 221-main construction passage; 222-construction branch passage; 23-connecting tunnel; 231-first connecting tunnel; 232-second connecting tunnel; 24-assembly station; 25-charging and discharging pipelines; 30-mountain; 31-construction passage entrance. DETAILED DESCRIPTION

[0020] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0021] like Figure 1 and Figure 2 As shown, the compressed air energy storage power station of this embodiment includes an underground gas storage reservoir 20 and a ground plant area 10. The underground gas storage reservoir 20 is an underground gas storage reservoir based on mountain terrain as will be described in detail below. After the compressed air energy storage power station is built, the underground gas storage reservoir 20 is connected to the compressor unit and the expansion unit located in the ground plant area 10 through the inlet and outlet gas pipelines. The ground plant area 10 of this embodiment is relative to the underground gas storage reservoir 20 set in the mountain 30 as will be described in detail below. Its elevation is lower than the construction elevation of the underground gas storage reservoir 20, and it can be located on any relatively open plane below the waist of the mountain 30.

[0022] like Figure 1 and Figure 2As shown, the underground gas storage 20 of this embodiment is constructed based on the mountain terrain, and the natural elevation difference of the mountain 30 is used to form the required burial depth of the gas storage cavern 21. Most preferably, the underground gas storage is buried in the mountain 30 50-200 meters away from the top of the mountain. The underground gas storage based on the mountain terrain includes at least one group of gas storage caverns 21, all of which are buried in the mountain 30, and the gas storage caverns 21 are used to store compressed air. For a compressed air energy storage power station, the larger the volume of the gas storage cavern 21, the greater the amount of electricity stored. Preferably, the gas storage caverns 21 of this embodiment are more than two groups. The gas storage cavern 21 can adopt any existing artificial gas storage cavern, and can extend in a direction parallel to the ground or in the elevation direction of the mountain 30. Preferably, the gas storage cavern of this embodiment adopts the form of a flat cave. In the prior art, there are also many forms of flat caverns, for example, the gas storage cavern is a strip flat cave. Preferably, the gas storage cavern of this embodiment is annular. The annular gas storage cavern has no head or plug, which prevents the extremely high pressure area and extremely high temperature area formed by air compression in the local (head). Furthermore, the annular gas storage cavern includes two mutually parallel straight line segments and two arc segments, and the straight line segments and the arc segments are connected end to end, and the stress condition of the annular gas storage cavern is better. Of course, the annular gas storage cavern can also be any other shape, such as a circular ring.

[0023] like Figure 1 and Figure 2 As shown, the underground gas storage is also provided with a construction passage 22, which is a flat tunnel excavated from the construction passage entrance 31 located at the waist of the mountain to the inside of the mountain 30, and all the gas storage caverns 21 are excavated into the mountain 30 through the construction passage 22. The construction passage 22 is used to transport construction equipment to the construction area of ​​the gas storage cavern 21 during construction, and can be used to place the gas charging and discharging pipeline 25 after the underground gas storage is built. Before the construction of the gas storage, the location of the construction passage entrance 31 at the waist of the mountain is determined through the project address evaluation. During the construction of the gas storage, the construction passage entrance 31 is first excavated from the waist of the mountain, and drilling and blasting or other methods can be selected for excavation. Then, the construction passage 22 is excavated from the construction passage entrance 31 into the mountain 30, and finally all the gas storage caverns 21 are excavated from the construction passage 22.

[0024] The underground gas storage based on mountain terrain of the present invention has a construction passage 22 which is a flat tunnel. The excavation process of the flat tunnel is mature and the construction speed is fast. Construction materials such as steel lining can be conveniently and quickly transported to the construction site through the construction passage 22 in the form of a flat tunnel through construction tools such as transport trolleys. Compared with the prior art, the use of lifting equipment such as cranes is greatly reduced, the use of manpower and material resources is greatly reduced, and the construction period is shortened. In addition, the existing underground gas storage can only exhaust smoke through the vertical shaft. If the number of vertical shafts is small and the ventilation holes are arranged unreasonably, it is easy to cause the problem of poor ventilation in the construction area of ​​the underground gas storage. At the same time, the welding of the steel lining of the underground gas storage will produce a large amount of smoke. If it is not discharged in time, it will not only affect the normal construction, but also threaten the health of the construction workers. The underground gas storage is built based on the mountain 30 in a flat tunnel manner, and the ventilation and smoke exhaust conditions will be greatly improved. Compared with the existing underground gas storage, the construction amount of the vertical shaft is greatly reduced, which not only reduces the investment in related equipment, but also shortens the construction period.

[0025] On this basis, if Figure 1 and Figure 2 As shown, the elevation of the gas storage cavern 21 is greater than the elevation of the construction channel entrance 31, which is more convenient for smoke exhaust of the underground gas storage. Furthermore, the elevation of the construction channel 22 gradually increases from the construction channel entrance 31 to the gas storage cavern 21, so that the entire construction channel 22 is an inclined plane, so that the above-mentioned construction channel 22 can transport various construction equipment. Furthermore, the elevation of the gas storage cavern 21 close to the construction channel 22 is lower than its elevation away from the construction channel 22. As a whole, the gas storage cavern 21 is arranged in an inclined state, and the position of the gas storage cavern 21 close to the main construction channel 221 is lower than the position away from the main construction channel 221. The elevation of the gas storage cavern 21 also gradually increases starting from the construction channel 22.

[0026] The elevation changes of the construction passage 22 and the gas storage cavern 21 make the construction passage 22 and the gas storage cavern have a certain slope as a whole. Since the groundwater in the mountain 30 has the characteristic of small lateral infiltration, the groundwater mainly seeps out from the top and bottom. Therefore, the construction passage 22 and the gas storage cavern with a certain slope can make the groundwater seepage naturally drain, reducing the impact of groundwater seepage on the construction process of the gas storage. In particular, the construction procedures such as steel lining welding and concrete pouring of the gas storage cavern have a great impact on the construction. In the prior art, it is necessary to carry out drainage operations before construction. However, the underground gas storage constructed based on the mountain terrain of the present invention uses the elevation difference to form a natural drainage structure when excavating the construction passage 22 and the gas storage cavern. The groundwater seepage is naturally discharged during the above construction, which reduces the time of drainage operations and further shortens the construction period.

[0027] Furthermore, drainage ditches are provided along the inner bottom surface of the construction channel 22. Preferably, at least two drainage ditches are provided, and the two drainage ditches are respectively located on both sides of the inner bottom surface of the construction channel 22 for guiding water to be discharged at a fixed point.

[0028] like Figure 1 and Figure 2 As shown, the construction channel 22 includes a main construction channel 221 and at least one branch construction channel 222. One end of the main construction channel 221 is connected to the construction channel entrance 31 located at the waist of the mountain, and the other end is connected to all the branch construction channels 222. One end of the branch construction channel 222 is connected to the main construction channel 221, and the other end is extended to the construction position of the gas storage cavern 21. When there are more than two groups of gas storage caverns 21, at least one branch construction channel 222 is correspondingly set for each group of gas storage caverns 21. Multiple construction teams can use the branch construction channels 222 to carry out construction at the same time, shortening the construction period.

[0029] like Figure 2 As shown, a preferred structure of the underground gas storage in this embodiment is: the underground gas storage includes at least two groups of gas storage caverns. The cross section of the gas storage cavern is circular. The innermost layer of the gas storage cavern is a steel lining, and the area wrapped in the steel lining is the gas storage area. During construction, the rock layer where the gas storage cavern 21 is located is excavated from the construction channel 22, the excavation diameter is larger than the diameter of the steel lining, and then the steel lining is constructed in the excavated space. After the steel lining is constructed, concrete is filled between the steel lining and the rock layer. The two gas storage caverns are arranged side by side.

[0030] like Figure 2 As shown, the underground gas storage of this embodiment also includes a connecting tunnel 23. The connecting tunnel includes a first connecting tunnel 231, which is located between two gas storage caverns, and the middle part of the first connecting tunnel 231 is connected to the construction channel 22. The first connecting tunnel 231 can be connected to the main construction channel 221, and can also be connected to the construction branch channel 222. The construction equipment enters the excavation of the gas storage cavern 21 through the construction channel 22 and the first connecting tunnel 231. The two ends of the first connecting tunnel 231 are respectively a group of gas storage caverns 21, and the equipment and materials are respectively introduced into the two groups of gas storage caverns through the first connecting tunnel. At this time, the two groups of gas storage caverns 21 can be constructed at the same time, which speeds up the construction.

[0031] like Figure 2As shown, when the gas storage cavern is annular, the annular gas storage cavern 21 includes two parallel straight segments and two arc segments, and the straight segments are connected end to end. A second connecting lane 232 is also provided between the parallel straight segments of a group of annular gas storage caverns 21, and the two ends of the second connecting lane 232 are respectively connected to the two straight segments. Equipment and materials enter through the second connecting lane, and the construction of a group of gas storage caverns can be divided into four groups of construction equipment and personnel for simultaneous construction through the second connecting lane 232. That is, starting from the connection between one end of the second connecting lane and the straight segment, it is divided into left and right construction straight segments, and one end of the second connecting lane is also divided into left and right construction. Two groups of construction equipment and personnel meet at the arc segment at one end, and the other two groups of construction equipment and personnel meet at the arc segment at the other end, and finally the construction of a group of gas storage caverns is completed, further speeding up the construction speed. The construction direction of the gas storage cavern is not limited to the annular gas storage cavern 21, and any shape that can be constructed in two groups through the second connecting tunnel is acceptable. In some cases, the first connecting tunnel 231 and the second connecting tunnel 232 are collectively referred to as connecting tunnels 23.

[0032] like Figure 2 As shown, as a preference, an assembly station 24 is provided on the gas storage cavern, and the assembly station 24 serves as a steel lining assembly and finishing workshop during the construction period, and is a part of the gas storage cavern after the construction is completed. Further, the assembly station 24 is located at both ends of the connecting tunnel.

[0033] Preferably, after the steel plate and backfill concrete of the group of gas storage caverns are constructed, a blocking body and a sealing door are usually provided in the second connecting lane after construction. The sealing door is used to block the position connected to the gas storage cavern, and the blocking body is used to fill the internal space of the connecting lane. In addition to the blocking body and the sealing door, the first connecting lane is also provided with an inspection channel after construction. The inspection channel can be connected to the sealing door for daily maintenance during operation. Of course, after the main construction of the gas storage cavern 21 is completed, the first connecting lane and the second connecting lane can be provided with a blocking body, a sealing door and a charging and discharging pipe as needed.

[0034] like Figure 2 As shown, as a preference, the underground gas storage of this embodiment sets the gas charging and discharging pipe 25 in the construction channel 22. One end of the gas charging and discharging pipe 25 is connected to the compressor unit and the expansion unit, and the other end is connected to the gas storage cavern 21 connected thereto through the construction branch channel 222 of each gas storage cavern 21 through the inside of the construction main channel 221. The above arrangement makes the stress condition of the underground gas storage better during operation and prolongs the continuous use time of the underground gas storage.

[0035] like Figure 1 and Figure 2As shown, the compressed air energy storage power station of this embodiment includes an underground gas storage and a ground plant area, and the underground gas storage adopts an underground gas storage based on mountain terrain. The ground plant area is set up halfway up the mountain or near the mountain 30, and its elevation is lower than the underground gas storage located inside the mountain 30, and is located on a relatively open plane below the underground gas storage.

[0036] like Figure 1 As shown, further, the construction channel entrance 31 is also located at the lower part of the mountain 30, and the construction channel 22 is arranged inside the mountain from bottom to top. The construction channel entrance 31 is arranged close to the compressor unit and the expansion unit. The compressor unit and the expansion unit are located in the ground plant 10, and the elevation of the ground plant is lower than the overall elevation of the underground gas storage.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An underground gas storage based on mountain terrain, characterized in that: It comprises at least one group of gas storage caverns, all of which are buried in the mountain; It also includes a construction passage, which is a flat tunnel excavated from the construction passage entrance located at the waist of the mountain to the inside of the mountain, and all the gas storage caverns are continuously excavated into the mountain through the construction passage; The elevation of the gas storage cavern is greater than the elevation of the entrance of the construction passage.

2. The underground gas storage based on mountain terrain according to claim 1 is characterized in that: The elevation of the construction passage gradually increases from the entrance of the construction passage to the gas storage cavern.

3. The underground gas storage based on mountain terrain according to claim 1 is characterized in that: The elevation of the gas storage cavern close to the construction passage is lower than the elevation of the gas storage cavern far from the construction passage.

4. The underground gas storage based on mountain terrain according to claim 1 is characterized in that: After the construction of the gas storage cavern is completed, gas charging and discharging pipelines are laid in the construction channel.

5. The underground gas storage based on mountain terrain according to claim 1 is characterized in that: A connecting tunnel is arranged inside the gas storage cavern, and the connecting tunnel serves as a construction and transportation passage when the gas storage cavern is under construction. A blocking body is arranged on the connecting tunnel after the construction of the gas storage cavern is completed.

6. The underground gas storage based on mountain terrain according to claim 5 is characterized in that: One end of the connecting tunnel is communicated with the middle position of the gas storage cavern, and the gas storage cavern extends to both sides from the connection point between the connecting tunnel and the gas storage cavern.

7. The underground gas storage based on mountain terrain according to claim 5 is characterized in that: During the construction of the gas storage cavern, an assembly station is further provided in the gas storage cavern, and the assembly station is located at both ends of the connecting tunnel.

8. The underground gas storage based on mountain terrain according to claim 5 is characterized in that: After the construction of the gas storage cavern is completed, a sealing door is provided on the gas storage cavern, and the blocking body is located on a side of the sealing door away from the gas storage cavern.

9. A compressed air energy storage power station, characterized in that: It comprises a ground plant area and an underground gas storage based on mountain terrain as described in any one of claims 1 to 8, wherein the elevation of the underground gas storage based on mountain terrain is greater than the elevation of the ground plant area.

10. The compressed air energy storage power station according to claim 9, characterized in that: The entrance of the construction channel is also located at the lower part of the mountain. The construction channel is arranged inside the mountain from bottom to top. The entrance of the construction channel is arranged close to the compressor unit and the expansion unit. The compressor unit and the expansion unit are located in the ground plant.

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