Underground gas storage and compressed air energy storage power station
By placing the construction channel and the gas filling/discharging channel on opposite sides of the gas storage facility, and by rationally designing the channel diameter and concrete layer thickness, the impact of gas filling/discharging pipeline vibration on the stability of the gas storage facility was resolved, achieving long-term stable operation and improved safety.
Patent Information
- Application Number
- CN202423152308.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-12-20
AI Technical Summary
The filling and releasing pipelines of underground gas storage facilities experience severe vibrations during the filling and releasing process, affecting the stability and safety of the gas storage facilities.
The construction access and the gas filling and venting access are located on both sides of the gas storage area. The diameter of the gas filling and venting access is reasonably selected based on the pipeline diameter, and the thickness of the concrete layer is reasonably determined. The construction access and the gas filling and venting access are placed on both sides of the gas storage area to reduce disturbance to the surrounding rock and damage to the concrete layer.
This improved the stability and safety of the underground gas storage facility, reduced damage to the concrete layer, enabled long-term stable operation, and shortened the construction period.
Smart Images
Figure CN223609870U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to underground gas storage technical field especially relates to a kind of underground gas storage and compressed air energy storage power station. BACKGROUND
[0002] Compressed air energy storage power station uses compressed air energy storage system to store energy and generate electricity, and the compressed air energy storage system is a technology using compressed air energy storage. When storing energy, the motor drives the multi-stage compressor to compress air to high pressure and store it in the gas storage device, completing the conversion of electric energy to air pressure energy. When releasing energy, the compressed air is released from the gas storage device and enters the multi-stage expander to work, completing the conversion of air pressure energy to electric energy. One implementation of the gas storage device is to build an underground artificial cavern, i.e., an underground gas storage, which has the advantage of large gas storage capacity and is more suitable for large-scale compressed air energy storage systems.
[0003] In the process of implementing the utility model, the inventors found that at least the following problems exist in the prior art: The filling and discharging pipeline of the underground gas storage will produce severe vibration during the filling and discharging process, which seriously affects the stability of the underground gas storage. SUMMARY
[0004] The purpose of the utility model is to provide an underground gas storage and compressed air energy storage power station that can operate continuously and stably.
[0005] To achieve this purpose, on the one hand, an underground gas storage is provided, which includes a gas storage area, the gas storage area includes at least one group of gas storage caverns; further comprising a construction passage, the construction passage is communicated with all gas storage caverns during the construction of the gas storage area; further comprising a filling and discharging passage, a filling and discharging pipeline is laid along the direction of the filling and discharging passage in the filling and discharging passage, the filling and discharging pipeline is communicated with all gas storage caverns; the construction passage and the filling and discharging passage are located on both sides of the gas storage area, respectively.
[0006] Further, a maintenance passage is laid in the construction passage, and a sealing door body is arranged at the intersection of the maintenance passage and the gas storage cavern.
[0007] Further, the filling and discharging passage includes a filling and discharging main passage and at least one group of filling and discharging branch passages, each group of the filling and discharging branch passages communicates the filling and discharging main passage with each group of the gas storage caverns.
[0008] Further, the construction passage includes a construction main passage and at least one group of construction branch passages, each group of the construction branch passages communicates the construction main passage with each group of the gas storage caverns.
[0009] Further, on the gas storage cavern, the construction branch passage and the filling and discharging branch passage are arranged in the same line.
[0010] Further, the at least one group of gas storage caverns is annular.
[0011] Further, the gas storage caverns comprise two straight segments and connecting segments, and the two connecting segments are connected with the end portions of the two straight segments respectively.
[0012] Further, the construction passage is communicated with one of the connecting segments, and the gas charging and discharging pipeline is communicated with the other connecting segment; or, the construction passage is communicated with one of the connecting segments, and the gas charging and discharging pipeline is communicated with one of the straight segments.
[0013] Further, the outer side of the gas charging and discharging pipeline is backfilled with concrete.
[0014] In another aspect, a compressed air energy storage power station is also provided, comprising the underground gas storage as described above.
[0015] One of the above technical solutions has the following advantages or beneficial effects: since the construction passage and the gas charging and discharging passage of the underground gas storage are located at two sides of the gas storage area respectively, the excavation diameter of the gas charging and discharging passage is reasonably selected according to the diameter of the gas charging and discharging pipeline. Therefore, compared with the prior art, the excavation section of the gas charging and discharging passage in the rock mass is small, the disturbance to the original surrounding rock is smaller, the thickness of the concrete layer backfilled in the gas charging and discharging pipeline and the gas charging and discharging passage is thinner, the vibration is better transmitted to the surrounding rock during the gas charging and discharging process, the concrete layer is not easy to be damaged, and the gas charging and discharging pipeline is more stable under the gas charging and discharging working condition. Therefore, the underground gas storage of the embodiment can be stably operated. Since the compressed air energy storage power station comprises the underground gas storage as described above, the compressed air energy storage power station can realize long-time energy storage. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 is a structure of an underground gas storage.
[0017] In the figure: 1-gas storage cavern; 2-construction passage; 3-inspection passage; 4-gas charging and discharging passage. DETAILED DESCRIPTION
[0018] In order to make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the utility model embodiment will be further described in detail below in combination with the drawings. Obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the protection scope of the utility model. It should be explained that, in the case of no conflict, the following embodiments and the features in the embodiments can be combined with each other.
[0019] The compressed air energy storage power station adopts a compressed air energy storage system to store energy and generate electricity. The compressed air energy storage system includes a compressor unit, an expander unit and an underground gas storage. When storing energy, air is compressed to a medium-high pressure state by the compressor unit and then introduced into the underground gas storage through a charging pipeline. When generating electricity is needed, compressed air in the underground gas storage is introduced into the air inlet of the expander unit through a discharging pipeline to drive the expander to expand and generate electricity. The above process is also called energy release. Since energy storage and energy release are not performed at the same time, the charging pipeline and the discharging pipeline are connected to the underground gas storage through a common pipeline, i.e., a charging and discharging pipeline. At the other end of the charging and discharging pipeline, two branches are divided, one of which is connected to the compressor unit and the other of which is connected to the expander unit. A valve group is arranged at the branch point to select whether the underground gas storage is connected to the compressor unit or the expander unit by switching the valve group.
[0020] When using an underground gas storage to store gas, a long section of the charging and discharging pipeline is buried underground, and a section of the charging and discharging pipeline connected to the compressor unit / expander unit is located on the ground. That is, the charging and discharging pipeline is laid from the ground to the underground gas storage. The structure used for storing gas in the gas storage is called a gas storage chamber. In a large-scale compressed air energy storage power station, there are multiple gas storage chambers, each of which is connected to the charging and discharging pipeline. The inventors found that the disturbance of the charging and discharging pipeline located in the underground part to the original surrounding rock is large, thereby affecting the stability and safety of the underground gas storage. Therefore, the present embodiment provides an underground gas storage and a compressed air energy storage power station that can operate stably for a long time.
[0021] As shown in Figure 1 The underground gas storage of the present embodiment includes a gas storage area, which includes at least one group of gas storage chambers 1 for storing medium-high pressure gas. The underground gas storage also includes a construction passage 2 and a charging and discharging passage 4. The construction passage 2 is connected to all the gas storage chambers 1 during the construction of the gas storage area, and the charging and discharging passage 4 has a charging and discharging pipeline connected to all the gas storage chambers 1. The construction passage 2 and the charging and discharging passage 4 are respectively located on both sides of the gas storage area.
[0022] The construction passage is usually a slope shaft from the ground to the underground when the underground gas storage is located in a mountain. When the underground gas storage is located in a mountain, the construction passage is a horizontal tunnel from the ground to the mountain or from the half mountain. No matter which one, the construction passage is a passage connecting the outside and the underground gas storage. In the prior art, the buried part of the charging and discharging pipeline is directly laid in the construction passage after the construction of the gas storage cavern in the gas storage area is completed, and then the concrete is backfilled between the outside of the charging and discharging pipeline and the construction passage to fix the charging and discharging pipeline. However, the diameter of the charging and discharging pipeline is much smaller than that of the construction passage, so the thickness of the concrete layer outside the charging and discharging pipeline is very thick. Since the charging and discharging pipeline is filled with high-pressure gas during operation, the charging and discharging pipeline will vibrate during the charging and discharging process. Since the strength of the concrete is less than that of the surrounding rock, the concrete layer will crack and break under the charging and discharging working condition, which will increase the vibration degree of the charging and discharging pipeline.
[0023] The underground gas storage of the embodiment vibrates. Since the construction passage 2 and the charging and discharging passage 4 are located on the two sides of the gas storage area respectively, the diameter of the charging and discharging passage 4 is reasonably selected according to the diameter of the charging and discharging pipeline, so that the thickness of the concrete area outside the charging and discharging pipeline can also be reasonably determined. Compared with the prior art, the diameter of the charging and discharging passage 4 of the embodiment matches the charging and discharging pipeline, and the thickness of the concrete layer during backfilling is reasonable. Under normal circumstances, the excavation diameter of the charging and discharging passage is smaller than that of the construction passage, so compared with the prior art, the excavation section of the charging and discharging passage in the rock mass is smaller, the disturbance to the original surrounding rock is smaller, the thickness of the concrete layer backfilled in the charging and discharging pipeline and the charging and discharging passage is thinner, the vibration is better transmitted to the surrounding rock during the charging and discharging process, the concrete layer is not easy to damage, and the charging and discharging pipeline is more stable under the charging and discharging working condition. Therefore, the underground gas storage of the embodiment can be continuously and stably operated for a long time. In addition, in the embodiment, the construction passage 2 and the charging and discharging passage 4 are located on the two sides of the gas storage area respectively, so the construction passage 2 and the charging and discharging passage 4 can be constructed at the same time, which shortens the construction period compared with the prior art.
[0024] The construction passage 2 is used to transport equipment and personnel to all the gas storage caverns 1 during the construction of the gas storage area. After the construction of the gas storage area is completed, the maintenance passage 3 is laid in the construction passage 2, and a sealing door body is arranged at the intersection of the maintenance passage 3 and the gas storage cavern 1. The maintenance passage 3 is used for personnel and maintenance equipment to enter the underground gas storage during the operation of the underground gas storage. In the prior art, the maintenance passage 3 and the inlet and outlet pipeline are located in the construction passage 2, and the concrete is backfilled outside them. At this time, the vibration of the inlet and outlet pipeline will affect the safety of the personnel in the maintenance passage 3. In the embodiment, since the construction passage 2 and the charging and discharging passage 4 are located on the two sides of the gas storage area respectively, the maintenance passage 3 and the charging and discharging pipeline are also located on the two sides of the gas storage area respectively, so that the maintenance passage 3 and the charging and discharging pipeline do not affect each other.
[0025] Further, the construction passage 2 and the charging / discharging passage 4 are symmetrically arranged. As shown in Figure 1 When the gas storage area comprises two or more groups of gas storage caverns 1, the construction passage 2 comprises a main construction passage and branch construction passages, and the branch construction passages are connected to each of the gas storage caverns 1. The number of the branch construction passages is consistent with the number of the gas storage caverns 1. Meanwhile, the charging / discharging passage 4 comprises a main charging / discharging passage and branch charging / discharging passages, and the branch charging / discharging passages are connected to each of the gas storage caverns 1. The number of the branch charging / discharging passages is consistent with the number of the gas storage caverns 1. When the charging / discharging passage 4 comprises the main charging / discharging passage and the branch charging / discharging passages, the charging / discharging pipeline is arranged along the main charging / discharging passage and the branch charging / discharging passages. When the construction passage 2 comprises the main construction passage and the branch construction passages, the maintenance passage 3 is arranged along the main construction passage and the branch construction passages.
[0026] Further, the branch construction passages and the branch charging / discharging passages are collinear on some positions of the gas storage caverns 1. Further, the main construction passage and the main charging / discharging passage are symmetrically arranged relative to the gas storage area. The gas storage caverns 1 can be selected from any existing shape, such as a cylindrical gas storage cavern 1, a vertical shaft gas storage cavern 1 or a horizontal tunnel gas storage cavern 1. As preferred, the gas storage caverns 1 of the present embodiment are horizontal tunnels. Further, as shown in Figure 1 the gas storage caverns 1 are annular horizontal tunnels. As preferred, the annular horizontal tunnel gas storage cavern 1 comprises two straight segments and two connecting segments, the two straight segments are arranged in proximity to parallel, and the two connecting segments are arc-shaped and connected to the ends of the two straight segments. The construction passage 2 comprises the main construction passage and the branch construction passages, and the charging / discharging passage 4 comprises the main charging / discharging passage and the branch charging / discharging passages, and each of the gas storage caverns 1 is connected to one of the branch construction passages and one of the branch charging / discharging passages. The specific positions of the gas storage caverns 1, the construction passage 2 and the charging / discharging passage 4 are also affected by the geological conditions. As shown in Figure 1 on some of the gas storage caverns 1, the branch construction passages and the branch charging / discharging passages can be respectively located on the two connecting segments, and the branch construction passages and the branch charging / discharging passages are collinearly arranged. On other gas storage caverns 1, the branch construction passages are located on the connecting segments, and the branch charging / discharging passages are located on the straight segments.
[0027] The present embodiment also provides a compressed air energy storage power station comprising any of the underground gas storage libraries described above. Since the underground gas storage library can be stably operated for a long time, the compressed air energy storage power station can achieve long-time and large-scale energy storage.
[0028] In the description of the utility model, unless another definite provision and limitation, the term "link", "connection", "fix" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can pass through the indirect connection of intermediate medium, can be two element internal communication or two element mutual action relation. For ordinary skilled person in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to specific circumstances.
[0029] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the direct contact of the first and second features, also can include the contact of the first and second features not direct but through the additional feature between them.And, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the horizontal height of the first feature is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the horizontal height of the first feature is less than the second feature.
[0030] Obviously, the above embodiment of the utility model is only for clear illustration of the utility model, and is not the limitation of the embodiment of the utility model.For ordinary skilled person in the art, on the basis of the above-mentioned description, other different forms of changes or variations can be made.The need for all the embodiments is not exhausted here.The any modification, equivalent replacement and improvement, etc. made in the spirit and principle of the utility model should be included in the protection scope of the utility model claims.
Claims
1. An underground gas storage, characterized in that, The underground gas storage comprises a gas storage area, which comprises at least one group of gas storage caverns. The underground gas storage further comprises a construction passage, which is in communication with all the gas storage caverns during the construction of the gas storage area. The underground gas storage further comprises a gas filling and discharging passage, in which a gas filling and discharging pipeline is laid along the direction of the gas filling and discharging passage, and the gas filling and discharging pipeline is in communication with all the gas storage caverns. The construction passage and the gas filling and discharging passage are respectively located on two sides of the gas storage area.
2. The underground gas storage according to claim 1, characterized in that, A maintenance passage is laid in the construction passage, and a sealing door is arranged at the intersection of the maintenance passage and the gas storage cavern.
3. The underground gas storage according to claim 1, characterized in that, The gas filling and discharging passage comprises a main gas filling and discharging passage and at least one group of gas filling and discharging branch passages, and each group of the gas filling and discharging branch passages is in communication with the main gas filling and discharging passage and each group of the gas storage caverns.
4. The underground gas storage reservoir of claim 3, wherein, The construction passage comprises a main construction passage and at least one group of construction branch passages, and each group of the construction branch passages is in communication with the main construction passage and each group of the gas storage caverns.
5. The underground gas storage reservoir of claim 4, wherein, The construction branch passages and the gas filling and discharging branch passages are arranged in the same line on the gas storage cavern.
6. The underground gas storage reservoir of claim 1, wherein, At least one group of the gas storage caverns is annular.
7. The underground gas storage reservoir of claim 6, wherein, The gas storage cavern comprises two straight segments and two connecting segments, and the two connecting segments are respectively connected with the end portions of the two straight segments.
8. The underground gas storage reservoir of claim 7, wherein, The construction passage is in communication with one of the connecting segments, and the gas filling and discharging pipeline is in communication with the other connecting segment; or the construction passage is in communication with one of the connecting segments, and the gas filling and discharging pipeline is in communication with one of the straight segments.
9. The underground gas storage reservoir of claim 1, wherein, The outer side of the gas filling and discharging pipeline is backfilled with concrete.
10. A compressed air energy storage power plant, characterized in that, The underground gas storage comprises the underground gas storage according to any one of claims 1-9.