CN117988926A - Method for backfilling open pit to build underground gas storage and underground gas storage - Google Patents
Method for backfilling open pit to build underground gas storage and underground gas storage Download PDFInfo
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- CN117988926A CN117988926A CN202410180888.5A CN202410180888A CN117988926A CN 117988926 A CN117988926 A CN 117988926A CN 202410180888 A CN202410180888 A CN 202410180888A CN 117988926 A CN117988926 A CN 117988926A
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- 239000002699 waste material Substances 0.000 claims abstract description 12
- 239000002893 slag Substances 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- 239000010410 layer Substances 0.000 claims description 23
- 238000012423 maintenance Methods 0.000 claims description 12
- 239000012791 sliding layer Substances 0.000 claims description 10
- 239000004576 sand Substances 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 3
- 238000004146 energy storage Methods 0.000 abstract description 13
- 230000029087 digestion Effects 0.000 abstract description 3
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- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 238000012983 electrochemical energy storage Methods 0.000 description 1
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- 239000002245 particle Substances 0.000 description 1
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- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
The invention belongs to the technical field of compressed air energy storage, and provides a method for backfilling open pit and building an underground gas storage, and the underground gas storage, which comprises the steps of deep digging the bottom of an open abandoned pit to excavate partial bedrock, and building the underground gas storage on the bedrock; building a vertical shaft, enabling the bottom of the vertical shaft to be communicated with an underground gas storage, paving a plurality of gas pipelines communicated with the inside of the underground gas storage in the vertical shaft, building artificial surrounding rock at the bottom of a pit, and wrapping the underground gas storage and the bottom of the vertical shaft; backfilling stripping waste slag in the adjacent mine to be mined into an open-air waste pit to form a backfill area, exposing the top of the vertical shaft from the top of the backfill area, and connecting a plurality of gas pipelines in the vertical shaft with a compressor and an expander on the ground surface. The invention can solve the problems of high construction cost and high difficulty of the traditional gas storage chamber, and can also solve the problems of digestion of the adjacent stripping slag, ground disaster prevention and ecological restoration.
Description
Technical Field
The invention belongs to the technical field of compressed air energy storage, and particularly relates to a method for backfilling open pit to build an underground gas storage and the underground gas storage.
Background
Compressed AIR ENERGY Storage (CAES) is a novel physical energy Storage technology for storing energy and generating electricity by using Compressed air as a medium, and can realize large-scale Storage and scheduling of energy sources and improve the stability and reliability of an electric power system. Compared with the modes of water pumping and energy storage, electrochemical energy storage and the like, the CAES has the advantages of long service life, large scale, low cost, environmental friendliness, convenient maintenance and the like, is widely paid attention to, and is the energy storage technology with the most prospect at present.
The gas storage is a structure for storing high-pressure air, and is generally built in a deep underground rock body in a single excavation mode. The compressed air energy storage underground gas storage which is built independently has high manufacturing cost and complex construction process, and site selection is limited by geological conditions, so that excellent sites are difficult to obtain. However, after the surface mine is exploited in a large scale, a large scale surface pit is often left, and the abandoned pit is necessarily backfilled according to the concepts of slag on-site digestion, ground disaster prevention and ecological restoration, but a large amount of funds, manpower and material resources are wasted in the simple backfilling operation.
Disclosure of Invention
The invention aims to provide a method for backfilling open pit and building an underground gas storage and the underground gas storage, so as to solve the problems of high construction cost and high difficulty of the traditional gas storage chamber and solve the problems of digestion, ground disaster prevention and ecological restoration of the nearby stripping slag.
In order to achieve the above object, the present invention provides the following solutions: a method for backfilling open pit to build underground gas storage, comprising the following steps:
Deep digging the bottom of an open-air abandoned pit until a part of bedrock is excavated, and building an underground gas storage on the bedrock;
Building a vertical shaft, enabling the bottom of the vertical shaft to be communicated with an underground gas storage, paving a plurality of gas pipelines communicated with the inside of the underground gas storage in the vertical shaft, building artificial surrounding rock at the bottom of a pit, and wrapping the underground gas storage and the bottom of the vertical shaft;
Backfilling stripping waste slag in the adjacent mine to be mined into an open-air waste pit to form a backfill area, exposing the top of the vertical shaft from the top of the backfill area, and connecting a plurality of gas pipelines in the vertical shaft with a compressor and an expander on the ground surface.
Preferably, after the bottom of the open-air abandoned pit is excavated deeply to excavate part of the bedrock, a bracket is built on the top of the bedrock, a drainage pipeline is paved, and the underground gas storage is built on the bracket.
Preferably, the construction of the artificial surrounding rock adopts a construction mode of layered staggered joint construction.
Preferably, the shaft is built in a bottom-up manner, with the backfill zone being progressively raised as it is backfilled.
The underground gas storage comprises a gas storage body and a plug, wherein the plug is arranged in the middle of the gas storage body and is communicated with the inside of the gas storage body, and the bottom of the vertical shaft is communicated with the plug.
Preferably, the side wall of the gas storage comprises a steel lining, a sliding layer and a primary lining support layer from inside to outside, and the sliding layer is used for reducing structural constraint between the steel lining and the primary lining support layer and reducing pressure of deformation caused by temperature change in the steel lining when compressed gas enters and exits to the primary lining support layer structure.
Preferably, the slip layer includes fine sand and linoleum.
Preferably, an overhaul channel is arranged in the plug, one end of the overhaul channel is communicated with the inside of the gas storage, the other end of the overhaul channel is communicated with the bottom of the vertical shaft, and two groups of airtight doors are arranged in the overhaul channel along the direction of the overhaul channel.
Preferably, one end of the gas transmission pipelines, which is far away from the compressor and the expander, penetrates through the side wall of the plug and the side wall of the gas storage and is communicated with the inside of the gas storage.
Compared with the prior art, the invention has the following advantages and technical effects:
1. According to the invention, the outdoor abandoned mine pit is used as the site of the compressed air energy storage gas storage, the resource advantages of the abandoned mine pit are fully utilized while the necessary requirements of the control and ecological restoration of the responsive disaster are met, and the gas storage is buried in a backfilling mode, so that the construction of the compressed air energy storage underground gas storage is avoided, and the construction cost of the compressed air energy storage is greatly reduced.
2. In the invention, the construction place of the compressed air energy storage gas storage warehouse belongs to an open air environment, compared with the traditional underground closed environment construction, the risk of collapse and burial can be reduced, the personal safety of staff is ensured, meanwhile, the construction difficulty is greatly reduced, and the method has better technical feasibility.
3. According to the invention, the resource advantage is fully utilized, the compressed air energy storage gas storage is built from inside to outside and from bottom to top, the construction of the compressed air energy storage underground gas storage is avoided, the rock mass is independently excavated, the building mode is simple and feasible, and the multi-win is realized in the aspects of electric power storage adjustment, ecological protection, resource development, cost saving, technical feasibility and the like.
4. In the invention, the constructed underground gas storage for storing energy effectively stores surplus energy and relieves the voltage consumption in the electricity consumption peak period.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a gas storage and a new pit to be excavated according to the present invention;
FIG. 2 is a schematic diagram of the backfill of stripping waste slag in an adjacent mine according to the present invention;
FIG. 3 is an overall cross-sectional view of the overall construction of the present invention;
FIG. 4 is a three-dimensional perspective view of the gas reservoir and artificial surrounding rock of the present invention;
FIG. 5 is a schematic diagram of a layered gas reservoir of the present invention;
FIG. 6 is a schematic cross-sectional view of a gas reservoir of the present invention;
FIG. 7 is a schematic structural view of a plug of the present invention;
1, a gas storage; 2. a plug; 3. artificial surrounding rock; 4. a bedrock; 5. a rock-soil body; 6. backfilling the area; 7. a shaft; 8. a gas line; 9. a steel lining; 10. a sliding layer; 11. a reinforcing mesh; 12. primary lining of the protective layer; 13. open-air abandoned mine pits; 14. adjacent to the mountain to be mined; 15. an airtight door; 16. a drainage pipe; 17. and (5) overhauling the channel.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1-7, the present invention provides a method for constructing an underground gas storage by backfilling an open pit, comprising the following steps:
Deep digging the bottom of the open-air abandoned pit 13 until a part of the bedrock 4 is excavated, and building an underground gas storage on the bedrock 4;
The diameter of the open-air abandoned pit 13 is more than one kilometer, and the depth is more than one hundred meters, so that enough space is ensured to accommodate the structures such as an underground gas storage, a vertical shaft 7, an artificial surrounding rock 3 and the like, stripping waste slag in an adjacent mountain 14 to be mined can be fully consumed during backfilling, and geological disasters of an open-air slope are avoided; and simultaneously, the original topography is restored and conditions are provided for implementing ecological restoration.
Building a vertical shaft 7, enabling the bottom of the vertical shaft 7 to be communicated with an underground gas storage, paving a plurality of gas pipelines 8 communicated with the inside of the underground gas storage in the vertical shaft 7, building artificial surrounding rock 3 at the bottom of a pit, and wrapping the underground gas storage and the bottom of the vertical shaft 7;
When the underground gas storage is built, a plurality of gas pipelines 8 are led out from the underground gas storage, and when a vertical shaft 7 communicated with the underground gas storage is built on the underground gas storage, the plurality of gas pipelines 8 are laid along with the building of the vertical shaft 7. After the building height of the vertical shaft 7 exceeds a certain height, pouring the artificial surrounding rock 3 to wrap the underground gas storage and part of the vertical shaft 7.
Backfilling stripping waste slag in the adjacent mine 14 to be mined into an open-air waste pit 13 to form a backfill area 6, exposing the top of the vertical shaft 7 from the top of the backfill area 6, and connecting a plurality of gas pipelines 8 in the vertical shaft 7 with a compressor and an expander on the ground surface.
After the casting of the artificial surrounding rock 3 is completed, backfilling stripping waste slag in the adjacent mine 14 to be mined into the open-air waste pit 13 to gradually form a backfill area 6. In the process of forming the backfill area 6, the vertical shaft 7 is continuously built, so that the vertical shaft 7 is gradually raised along with the backfill of the backfill area 6 until the backfill area 6 is backfilled to the vicinity of the ground surface.
Further optimization is achieved in that a service elevator (not shown in the figure) is arranged in the shaft 7.
The setting of the overhaul elevator can facilitate the overhaul of the underground gas storage by staff.
According to a further optimization scheme, the number of the gas pipelines 8 in the vertical shaft 7 is two, and two groups of gas pipelines 8 respectively enter and exit the underground gas storage. The vertical shaft 7 can provide reliable protection for the gas pipeline 8, ensure that the gas pipeline 8 is reliably connected with a compressor and an expander on the underground gas storage and the ground,
Further optimizing scheme, after the bottom of the open-air abandoned pit 13 is excavated to the bottom of the excavated part of the bedrock 4, a bracket is built at the top of the bedrock 4, a drainage pipeline 16 is laid, and an underground gas storage is built on the bracket.
After the underground gas reservoir is built on the rack, it should be ensured that the lower part of the underground gas reservoir is below the bedrock layer formed by the bedrock 4, as shown in fig. 3.
Further optimizing scheme, the construction of the artificial surrounding rock 3 adopts a construction mode of layered staggered joint construction.
The artificial surrounding rock 3 is formed by casting concrete, and the underground gas storage and the bottom part structure of the vertical shaft 7 are integrally cast during construction. The artificial surrounding rock 3 is wrapped outside the underground gas storage in a certain range, so that reliable supporting conditions are provided for the underground gas storage. The bottom part structure of the underground gas storage and the vertical shaft 7 can be completely sealed by adopting a layered staggered joint construction mode.
Further optimizing scheme, the vertical shaft 7 is built in a bottom-up mode, and the vertical shaft is gradually increased along with backfilling of the backfilling area 6.
The underground gas storage comprises a gas storage 1 and a plug 2, wherein the plug 2 is arranged in the middle of the gas storage 1, the plug 2 is communicated with the inside of the gas storage 1, and the bottom of a vertical shaft 7 is communicated with the plug 2.
The main function of the air reservoir 1 is to store high pressure air; the main function of the plug 2 is to fix the gas pipeline 8 and communicate the gas storage 1 with the vertical shaft 7, so that air can conveniently circulate between the gas storage 1 and the ground compressor and the expander, and workers can conveniently enter the gas storage 1 to carry out maintenance and other works.
The plug 2 is arranged in the middle of the gas storage 1, so that energy loss in the process of inflation and deflation can be effectively reduced.
Further optimizing scheme, the lateral wall of gas storage 1 includes steel lining 9, sliding layer 10 and primary backing layer 12 from inside to outside, and sliding layer 10 is used for reducing the structural constraint between steel lining 9 and primary backing layer 12, reduces the deformation to primary backing layer 12 structure's pressure that the temperature variation brought because of compressed gas business turn over in steel lining 9.
Further preferably, the slip layer 10 comprises fine sand and linoleum.
Specifically, during construction, the asphalt felt is tightly paved on the outer side of the steel lining 9 along the circumferential direction, fine sand particles are uniformly sprayed on the surface of the asphalt felt after the asphalt felt is paved, and when the asphalt felt is supported and protected, the friction resistance between the steel lining 9 and the primary lining support layer 12 can be effectively reduced, so that the steel lining 9 and the primary lining support layer 12 can freely slide when the air pressure in the steel lining 9 changes.
As shown in fig. 5 and 6, after the support is erected on the bedrock 4, the gas storage 1 is constructed in the direction of the steel lining 9, the sliding layer 10 and the primary lining support layer 12, specifically, after the steel lining 9 is fixedly connected to the support, fine sand and linoleum are paved on the steel lining 9, then, transverse steel bars and longitudinal steel bars are built on the steel lining 9 paved with the fine sand and the linoleum to form a double-layer and multi-layer steel bar net 11, after the steel bar net 11 is built, the concrete degree is poured to form the primary lining support layer 12, and the pouring thickness of the primary lining support layer 12 is not less than 300mm.
The steel liner 9 is made of Q345 steel, the thickness of which is controlled between 5-30mm, and serves as a steel liner seal for the gas storage 1.
The sliding layer 10 is positioned between the steel lining 9 and the primary lining support layer 12, and allows sliding to occur between the steel lining 9 and the primary lining support layer 12, so that structural constraint between the steel lining 9 and the primary lining support layer 12 can be reduced, and pressure on the primary lining support layer 12 structure caused by deformation due to temperature change when compressed gas enters and exits in the steel lining 9 can be reduced.
Further optimizing scheme, the inside of end cap 2 is provided with maintenance passageway 17, and the one end of maintenance passageway 17 communicates with the inside of gas storage 1, and the other end of maintenance passageway 17 communicates with the bottom of shaft 7, is provided with two sets of air tight door 15 along the direction of maintenance passageway 17 in the maintenance passageway 17.
Further optimizing scheme, one end of a plurality of gas pipelines 8 far away from the compressor and the expander penetrates through the side wall of the plug 2 and the side wall of the gas storage 1 and is communicated with the inside of the gas storage 1.
As shown in fig. 7, the plug 2 is poured by using encrypted reinforced concrete. Two airtight doors 15 are arranged in the overhaul channel 17, a high-pressure door is arranged close to the gas storage 1, and a low-pressure door is arranged far away from the gas storage 1. Meanwhile, two gas transmission pipelines 8 for gas inlet and gas outlet extend out from the inside of the steel lining 9, penetrate through steel bars in the plug 2, enter the vertical shaft 7, cling to the inner wall of the vertical shaft 7, follow the construction progress of the vertical shaft 7, and finally are connected with a compressor and an expander on the ground.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (9)
1. A method for backfilling open pit to build underground gas storage, comprising the following steps:
deep digging the bottom of an open-air abandoned pit (13) until a part of bedrock (4) is excavated, and building an underground gas storage on the bedrock (4);
Building a vertical shaft (7), enabling the bottom of the vertical shaft (7) to be communicated with an underground gas storage, paving a plurality of gas pipelines (8) communicated with the inside of the underground gas storage in the vertical shaft (7), building artificial surrounding rock (3) at the bottom of a pit, and wrapping the underground gas storage and the bottom of the vertical shaft (7);
backfilling stripping waste slag in a mountain (14) to be mined adjacent to the mountain to be mined into an open-air waste pit (13) to form a backfill area (6), exposing the top of a vertical shaft (7) from the top of the backfill area (6), and connecting a plurality of gas pipelines (8) in the vertical shaft (7) with a compressor and an expander on the ground surface.
2. A method of constructing an underground gas storage with pit backfill according to claim 1, wherein: after the bottom of the open-air abandoned pit (13) is deeply excavated to excavate partial bedrock (4), a bracket is built at the top of the bedrock (4) and a drainage pipeline (16) is laid, and an underground gas storage is built on the bracket.
3. A method of constructing an underground gas storage with pit backfill according to claim 1, wherein: the construction of the artificial surrounding rock (3) adopts a layered staggered joint construction mode.
4. A method of constructing an underground gas storage with pit backfill according to claim 1, wherein: the vertical shaft (7) is built in a bottom-up mode, and rises gradually along with the backfilling of the backfilling area (6).
5. An underground gas storage, characterized in that: the underground gas storage comprises a gas storage (1) and a plug (2), the plug (2) is arranged in the middle of the gas storage (1) and is communicated with the inside of the gas storage (1), and the bottom of the vertical shaft (7) is communicated with the plug (2).
6. An underground gas storage according to claim 5, wherein: the side wall of the gas storage (1) comprises a steel lining (9), a sliding layer (10) and a primary lining support layer (12) from inside to outside, wherein the sliding layer (10) is used for reducing structural constraint between the steel lining (9) and the primary lining support layer (12) and reducing pressure of deformation caused by temperature change when compressed gas enters and exits into the steel lining (9) on the primary lining support layer (12) structure.
7. An underground gas storage according to claim 6, wherein: the sliding layer (10) comprises fine sand and linoleum.
8. An underground gas storage according to claim 5, wherein: the inside of end cap (2) is provided with maintenance passageway (17), the one end of maintenance passageway (17) with the inside intercommunication of gas storage (1), the other end of maintenance passageway (17) with the bottom intercommunication of shaft (7), follow in maintenance passageway (17) the direction of maintenance passageway (17) is provided with two sets of air tight door (15).
9. An underground gas storage according to claim 8, wherein: one end, far away from the compressor and the expander, of the plurality of gas pipelines (8) penetrates through the side wall of the plug (2) and the side wall of the gas storage (1) and is communicated with the inside of the gas storage (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410180888.5A CN117988926A (en) | 2024-02-18 | 2024-02-18 | Method for backfilling open pit to build underground gas storage and underground gas storage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410180888.5A CN117988926A (en) | 2024-02-18 | 2024-02-18 | Method for backfilling open pit to build underground gas storage and underground gas storage |
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| Publication Number | Publication Date |
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| CN117988926A true CN117988926A (en) | 2024-05-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410180888.5A Pending CN117988926A (en) | 2024-02-18 | 2024-02-18 | Method for backfilling open pit to build underground gas storage and underground gas storage |
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| Country | Link |
|---|---|
| CN (1) | CN117988926A (en) |
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- 2024-02-18 CN CN202410180888.5A patent/CN117988926A/en active Pending
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