Compressed air energy storage structure for filling and burying pipeline in pressure balance type abandoned mine laneway

Abstract

The invention relates to the technical field of mine energy storage, and particularly discloses a pressure balance type abandoned mine roadway filling and pipeline burying compressed air energy storage structure which comprises an air storage pipeline, an air inlet pipeline, an air compressor, an air outlet pipeline and a generator. Wherein the rigid gas storage pipeline is horizontally arranged in a horizontal roadway of a mine, and the space between the outer wall of the gas storage pipeline and the mine is filled with particulate matter to form a stress adjusting area with deformability. One end of the air inlet pipeline is connected with an air inlet of the air storage pipeline, and the other end of the air inlet pipeline is connected with the air compressor located outside the mine. One end of the air outlet pipeline is connected with an air outlet of the air storage pipeline, the other end of the air outlet pipeline is connected with the generator located outside the mine, and control valves are arranged on the air inlet pipeline and the air outlet pipeline so as to control connection and disconnection of the pipelines. According to the compressed air energy storage structure, the sealing performance, the safety and the long-term stability of a gas storage are greatly improved, and the development cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of mine energy storage, and in particular to a pressure-balanced abandoned mine tunnel filling buried pipeline compressed air energy storage structure. Background Art

[0002] In recent years, with the rapid development of intermittent energy such as wind and solar energy, the problems of wind and solar power abandonment and the control and safety issues brought about by the grid connection of intermittent energy have arisen. In order to meet the large-scale grid connection needs of intermittent energy and ensure the safe operation of the power grid, it is necessary to greatly improve the energy storage capacity of the current power grid.

[0003] Energy storage technology is of great significance in improving energy efficiency, promoting the development of new energy-related industries, and promoting the realization of energy strategic transformation. Compressed air energy storage is the second most suitable technology for GW-level large-scale power energy storage after pumped storage. Compressed air energy storage refers to the use of electrical energy to compress air during the low load period of the power grid, sealing the air at high pressure in a storage space, such as a gas tank and an underground cavern, and releasing the compressed air during the peak load period of the power grid to drive the steam turbine to generate electricity.

[0004] On the one hand, the increase in the number of abandoned mines will bring about problems such as the destruction of land resources and the deterioration of the ecological environment, such as surface collapse and mine water hazards; on the other hand, abandoned mines still have a large amount of usable space resources. Therefore, making full use of abandoned mines to build compressed air energy storage can well meet the needs of renewable energy consumption and peak load regulation in load areas. Summary of the invention

[0005] In view of the above problems, the present invention provides a pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure, which greatly improves the sealing, safety and long-term stability of the gas storage and reduces the development cost. Specifically, the technical solution of the present invention is as follows.

[0006] A pressure-balanced abandoned mine tunnel filled buried pipeline compressed air energy storage structure includes: an air storage pipeline, an air intake pipeline, an air compressor, an air outlet pipeline and a generator. Wherein: the rigid air storage pipeline is horizontally arranged in the horizontal tunnel of the mine, and a stress adjustment zone with deformable ability is formed between the outer wall of the air storage pipeline and the mine by filling with granular materials. One end of the air intake pipeline is connected to the air inlet of the air storage pipeline, and the other end is connected to the air compressor located outside the mine. One end of the air outlet pipeline is connected to the air outlet of the air storage pipeline, and the other end is connected to the generator located outside the mine, and control valves are provided on the air intake pipeline and the air outlet pipeline to control the on-off of the pipeline.

[0007] Furthermore, the stress adjustment area includes an inner layer area with smaller particles and an outer layer area with larger particles, and the particle size of the outer layer area gradually increases from the inside to the outside. Thus, the deformable effect can be maintained without causing concentrated stress on the gas storage pipeline. Optionally, the particle diameter of the outer layer area is 1.2 to 3 times the particle diameter of the inner layer area.

[0008] Furthermore, the gas storage pipeline is also covered with a rigid outer tube, and a stress adjustment zone with deformability is formed by the particles filled therebetween. Preferably, the gas storage pipeline and / or the outer tube have an anti-corrosion layer on their outer walls. Optionally, the anti-corrosion layer includes a polyethylene layer, an adhesive layer, and an epoxy resin layer in order from the inside to the outside.

[0009] Furthermore, the particles are formed by rigid particles coated with an elastic layer, or by rigid particles distributed in an elastic matrix.

[0010] Furthermore, the particle size of the rigid particles is 1-10 mm, and the thickness of the coating layer is 0.2-0.5 mm.

[0011] Furthermore, the ratio of the rigid particles to the elastic matrix is ​​1.8-2.2 parts by weight: 1 part by weight, and the particle size of the particles formed by the rigid particles is 2-15 mm.

[0012] Optionally, the rigid particles include at least one of sand, ore, slag and the like.

[0013] Optionally, the material of the elastic layer or the elastic matrix includes at least one of rubber, plastic and the like.

[0014] Furthermore, a displacement sensor is arranged on the inner wall of the gas storage pipeline to ensure the safety and stability of the gas storage pipeline.

[0015] Furthermore, an openable and closable inspection port is provided at the end of the gas storage pipeline to facilitate inspection of the interior of the pipeline.

[0016] Furthermore, a bellows compensator is provided on the gas storage pipeline so that the gas storage pipeline can adapt to the size changes caused by thermal expansion and contraction.

[0017] Furthermore, the valve on the air intake pipeline includes an air intake valve and an overpressure cut-off valve which are sequentially arranged between the air intake pipeline and the air storage pipeline.

[0018] Furthermore, the valve on the gas outlet pipeline includes a gas outlet valve and an overpressure relief valve which are sequentially arranged between the gas outlet pipeline and the gas storage pipeline.

[0019] Compared with the prior art, the present invention has at least the following beneficial technical effects: the pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure of the present invention can not only well meet the needs of renewable energy consumption and peak load regulation in load areas by installing high-pressure gas storage pipelines in deep abandoned mine tunnels as gas storage space. In addition, in view of the harsh geological conditions, complex geostress environment and local collapse damage state of abandoned mine tunnels, the present invention forms a stress adjustment zone with deformable ability between the gas storage pipeline and the tunnel by filling with granular materials, thereby coordinating the force of the gas pressure in the gas storage pipeline and the external pressure of the tunnel, which can more effectively resist alternating loads and greatly improve the safety and long-term stability of the gas storage pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0021] Figure 1 This is a schematic structural diagram of a pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure in the following embodiments.

[0022] Figure 2 1 is a cross-sectional view of a gas storage pipeline and its stress adjustment area in the following embodiments.

[0023] Figure 3 It is a cross-sectional view of another gas storage pipeline and its stress adjustment area in the following embodiments.

[0024] Figure 4 A cross-sectional view of another gas storage pipeline and its stress adjustment area in the following embodiments.

[0025] The marks in the figure represent: 1-air storage pipeline, 2-air inlet pipeline, 3-air compressor, 4-air outlet pipeline, 5-generator, 6-stress adjustment area, 7-outer pipe, 101-inspection port, 102-bellows compensator, 201-inlet valve, 202-overpressure cut-off valve, 401-air outlet valve, 402-overpressure relief valve, 601-inner area, 602-outer area. DETAILED DESCRIPTION

[0026] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0027] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or component needs to have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0028] The pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure of the present invention is now further described in conjunction with the accompanying drawings and specific embodiments of the specification.

[0029] refer to Figure 1 and Figure 2 , an example of a pressure-balanced abandoned mine tunnel filled with buried pipeline compressed air energy storage structure, including: a gas storage pipeline 1, an air inlet pipeline 2, an air compressor 3, an air outlet pipeline 4 and a generator 5. Specifically, the mine includes a vertical shaft and a horizontal tunnel at the bottom of the vertical shaft. The gas storage pipeline 1 is a seamless steel pipe, which is horizontally arranged in the horizontal tunnel. The gas storage pipeline 1 can be Figure 1 The "U"-shaped pipe shown can also be a straight pipe or any other suitable shape of pipe, which is mainly used to store high-pressure gas inside. The thickness of the gas storage pipe 1 can be determined according to the maximum gas storage pressure and considering a certain safety factor.

[0030] The air intake pipe 2 is vertically arranged in the shaft, and its lower end is connected to the air intake port on the side wall of the air storage pipe 1, and a control valve is provided between the two to control the on-off of the air storage pipe 1. The upper end of the air intake pipe 2 is connected to the air compressor 3 located outside the mine. The air compressor 3 is mainly used to compress the external air and then fill it into the air storage pipe 1 through the air pipe 2 for storage.

[0031] The gas outlet pipe 4 is vertically arranged in the shaft, the lower end of the gas outlet pipe 4 is connected to the gas outlet on the side wall of the gas storage pipe 1, and a control valve is provided between the two to control the on-off of the gas outlet pipe 4, the upper end of the gas outlet pipe 4 is connected to the generator 5 located outside the mine, after opening the control valve between the gas outlet pipe 4 and the gas storage pipe 1, the high-pressure air in the gas storage pipe 1 enters the generator 5 to drive it to operate and generate electricity, thereby converting the gas storage energy into electrical energy, and utilizing abandoned mines to realize the consumption of renewable energy and the peak-shaving needs of load areas.

[0032] Furthermore, considering the special circumstances such as the adverse geological conditions, complex geostress environment and local collapse damage of abandoned mine tunnels, in this embodiment, a stress adjustment zone 6 with deformable ability is formed by filling with granular materials between the outer wall of the gas storage pipeline 1 and the mine, and the granular materials can be selected from sand, ore, steel slag, etc. The provision of the stress adjustment zone 6 helps to coordinate the force of the gas pressure inside the gas storage pipeline and the pressure outside the tunnel, which can more effectively resist the alternating load and greatly improve the safety and long-term stability of the gas storage pipeline. This is because in tunnels with poor surrounding rock strength and integrity, local collapse often occurs, which causes the abnormal increase of local loads to be transmitted to the outer wall of the gas storage pipeline 1, which may cause the gas storage pipeline 1 to be locally overstressed and compressed inwardly deformed, thereby causing local deformation or even damage to the gas storage pipeline 1. Through the stress adjustment zone 6 with deformable ability, these tunnel pressures can be evenly transmitted to the outer wall of the gas storage pipeline 1. At this time, these pressures can offset the expansion of the gas storage pipeline 1 caused by the air pressure in the pipe, avoid stress concentration in a specific position, and prevent deformation and damage of the gas storage pipeline 1 caused by local stress. In addition, the provision of the stress adjustment zone 6 helps to buffer the destructive effect of disturbance loads on the tunnel caused by sudden collapse of local tunnels during long-term use of the tunnel. This is because the particles are hard inside and soft outside, which can absorb external impact or vibration energy, reduce direct impact on the pipeline, and prevent damage to the gas storage pipeline 1.

[0033] In addition, the stress adjustment area 6 also helps to reduce the heat loss during the process of filling and discharging, and improve the energy storage efficiency of the gas storage. This is because the granular material used in the present invention forms a porous structure after accumulation, and its thermal conductivity is very low, which can effectively isolate heat transfer and form an insulating environment, thereby reducing the dissipation of heat released during the air compression process (when filling), and then this part of the heat is absorbed and utilized again during the air expansion process (when deflation).

[0034] In a more preferred embodiment, the particulate matter in the pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure of the above-mentioned embodiment is formed by rigid particles (such as sand, gravel, ore, slag, etc.) coated with an elastic layer (such as rubber, plastic, etc.) (referred to as particulate matter A), wherein the particle size of the rigid particles is 1~10mm, and the thickness of the coating layer is 0.2~0.5mm. For example, the particle size of the rigid particles is 1mm and the thickness of the coating layer is 0.2mm, the particle size of the rigid particles is 2mm and the thickness of the coating layer is 0.3mm, the particle size of the rigid particles is 5mm and the thickness of the coating layer is 0.3mm, the particle size of the rigid particles is 8mm and the thickness of the coating layer is 0.4mm, and the particle size of the rigid particles is 10mm and the thickness of the coating layer is 0.5mm.

[0035] In another more preferred embodiment, the particulate matter of the pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure of the above embodiment is formed by rigid particles (such as sand, ore, steel slag, etc.) distributed in an elastic matrix (such as rubber, plastic, etc.) (referred to as particle B), and its particle size is 2-15 mm, such as 2 mm, 4 mm, 5 mm, 8 mm, 10 mm, 12 mm, 15 mm, etc. The ratio of the rigid particles to the elastic matrix is ​​1.8-2.2 parts by weight: 1 part by weight, such as 1.8:1, 1.9:1, 2:1, 2.2:1, etc.

[0036] The above-mentioned particles A and particles B have both certain rigidity and certain elasticity. On the one hand, they can better buffer the disturbance load around the tunnel. On the other hand, the stress adjustment area 6 that is squeezed and deformed can be restored after the disturbance load disappears, which is convenient for dealing with subsequent disturbance loads and preventing the stress adjustment area 6 from gradually becoming dense after multiple squeezing, thereby losing its deformability and eventually losing its protective effect on the gas storage pipeline 1. Therefore, the stress adjustment area 6 formed by the above-mentioned particles A and particles B has a better ability to coordinate the stress load on the gas storage pipeline 1.

[0037] In another more preferred embodiment, referring to Figure 3 When the abandoned mine tunnel is severely damaged or collapsed or is in a high stress area, a rigid outer tube 7 can be put on the gas storage pipeline 1, and the particles are filled between the two to form a stress adjustment zone with deformable ability, so that part of the surrounding rock stress is borne by the rigid outer tube 7, thereby achieving effective protection of the gas storage pipeline 1 and improving the anti-deformation ability.

[0038] In another embodiment, an anti-corrosion layer is further provided on the outer wall of the gas storage pipeline 1 and / or the outer tube 7, and the anti-corrosion layer includes a polyethylene layer, an adhesive layer, and an epoxy resin layer from the inside to the outside. Any other suitable anti-corrosion layer can also be used to improve the safety and durability of the gas storage pipeline 1 and the outer tube 7 in the underground humid environment and increase the service life.

[0039] In another embodiment, the gas storage pipeline 1 of the pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure of the above embodiment is formed by multiple steel pipes connected by flanges, and sealing gaskets are provided between the flanges of adjacent pipes to ensure good sealing of the connection and prevent air leakage. The length of each steel pipe can be between 10 and 15 meters, and other suitable lengths can be selected according to actual needs.

[0040] In another embodiment, reference Figure 4The stress adjustment area 6 of the pressure-balanced abandoned mine tunnel filling buried pipeline compressed air energy storage structure of the above embodiment includes an inner layer area 601 with smaller particles and an outer layer area 602 with larger particles, and the particle size of the outer layer area 602 gradually increases from the inside to the outside. The particle diameter of the outer layer area 602 is 1.2 to 3 times the particle diameter of the inner layer area 601, so that the deformable effect can be maintained and the contact form between the particles and the pipe wall can be converted from point contact to surface contact, avoiding the formation of concentrated stress on the gas storage pipeline 1, and at the same time, it is conducive to forming a porous low thermal conductivity structure.

[0041] In another embodiment, a displacement sensor, such as a ring-type deformation sensor, is arranged on the inner wall of the gas storage pipeline 1 of the pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure of the above-mentioned embodiment. When the displacement sensor detects that the displacement of the inner wall of the gas storage pipeline is negative and exceeds the set limit, it means that the external stress is too large. At this time, it is necessary to start the air compressor 3 to inflate the gas storage pipeline 1 to increase the pipeline pressure until the data fed back by the displacement sensor is within the normal range, and then stop the inflation and pressurization. When the displacement is a positive number and exceeds a certain limit, it means that the air pressure in the pipe is too high. At this time, it is necessary to open the valve to release the air through the outlet pipe 4 to reduce the pressure in the gas storage pipeline 1, and stop reducing the pressure when the data fed back by the sensor is within the normal range. This cycle is repeated to dynamically adjust the gas pressure inside the pipeline to ensure the safety and stability of the gas storage pipeline 1.

[0042] In another embodiment, the end of the gas storage pipeline 1 of the pressure-balanced abandoned mine tunnel filling and burying pipeline compressed air energy storage structure of the above embodiment is provided with an opening and closing inspection port 101, which adopts a quick-opening blind plate structure. The inspection port facilitates the entry and exit of the maintenance robot to inspect the inside of the gas storage pipeline 1.

[0043] In another embodiment, the gas storage pipeline 1 of the pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure of the above embodiment is provided with a bellows compensator 102. Furthermore, a bellows compensator 102 can be arranged every 60m, so as to utilize its own effective expansion and contraction to absorb the dimensional change of the gas storage pipeline 1 caused by thermal expansion and contraction, compensate for axial, lateral and angular displacement, and also have the function of noise reduction and vibration reduction.

[0044] In another embodiment, the valves on the air inlet pipe 2 of the pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure of the above embodiment include an air inlet valve 201 and an overpressure cut-off valve 202 which are sequentially arranged between the air inlet pipe 2 and the gas storage pipe 1. The valves on the air outlet pipe 4 include an air outlet valve 401 and an overpressure relief valve 402 which are sequentially arranged between the air outlet pipe 4 and the gas storage pipe 1. Among them: the overpressure cut-off valve 202 plays an emergency cut-off protection role, and has the function of monitoring the overpressure cut-off of the gas storage pressure. When the pressure in the gas storage pipe 1 is higher than the set pressure value, the cut-off valve can be quickly and urgently cut off to stop the gas storage pipe 1 from being inflated, so as to buy time for the manual control of the closing of the air inlet valve 201, thereby achieving the purpose of safety monitoring.

[0045] High-pressure gas is usually stored in the gas storage pipeline 1. When it is needed, the outlet valve 401 and the overpressure relief valve 402 are opened, and the high-pressure gas in the gas storage pipeline 1 is transported to the generator 5 through the outlet pipeline 4, and the gas storage energy is converted into electrical energy and transported out. When the pressure in the gas storage pipeline 1 exceeds the set value for some reason, the overpressure relief valve 402 is activated to immediately discharge a certain amount of gas to ensure the safe transportation of the energy storage gas.

[0046] Finally, it should be noted that any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. Although the above describes the specific implementation of the present invention in conjunction with the drawings, it is not a limitation of the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, various modifications or deformations that can be made by those skilled in the art without creative labor are still within the protection scope of the present invention.

Claims

1. A pressure-balanced abandoned mine tunnel filled with buried pipeline compressed air energy storage structure, characterized in that: include: An air storage pipeline, an air intake pipeline, an air compressor, an air outlet pipeline and a generator; wherein: the rigid air storage pipeline is horizontally arranged in a horizontal tunnel of a mine, and a stress adjustment zone with deformability is formed between the outer wall of the air storage pipeline and the mine by filling with granular matter; one end of the air intake pipeline is connected to the air inlet of the air storage pipeline, and the other end is connected to the air compressor located outside the mine; one end of the air outlet pipeline is connected to the air outlet of the air storage pipeline, and the other end is connected to the generator located outside the mine, and control valves are provided on both the air intake pipeline and the air outlet pipeline.

2. The pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure according to claim 1 is characterized in that: A displacement sensor is arranged on the inner wall of the gas storage pipeline.

3. The pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure according to claim 1 is characterized in that: The end of the gas storage pipeline is provided with an inspection port that can be opened and closed.

4. The pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure according to claim 1 is characterized in that: A bellows compensator is arranged on the gas storage pipeline.

5. The pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure according to claim 1 is characterized in that: The valves on the air intake pipeline include an air intake valve and an overpressure cut-off valve which are sequentially arranged between the air intake pipeline and the air storage pipeline; Optionally, the valve on the air outlet pipeline includes an air outlet valve and an overpressure relief valve which are sequentially arranged between the air outlet pipeline and the air storage pipeline.

6. The pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure according to claim 1 is characterized in that: The stress adjustment area includes an inner layer area with smaller particles and an outer layer area with larger particles, and the particle size of the outer layer area gradually increases from the inside to the outside; Optionally, the diameter of the particles in the outer layer is 1.2 to 3 times the diameter of the particles in the inner layer.

7. The pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure according to claim 1 is characterized in that: The gas storage pipeline is also covered with a rigid outer tube, and a stress adjustment zone with deformability formed by the particles is provided between the two; Preferably, the gas storage pipeline and / or the outer pipe has an anti-corrosion layer on its outer wall; Optionally, the anti-corrosion layer includes a polyethylene layer, an adhesive layer, and an epoxy resin layer from the inside to the outside.

8. The pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure according to any one of claims 1 to 7, characterized in that: The particles are formed by rigid particles coated with an elastic layer, or by rigid particles distributed in an elastic matrix.

9. The pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure according to claim 8 is characterized in that: The particle size of the rigid particles is 1-10 mm, and the thickness of the coating layer is 0.2-0.5 mm; Alternatively, the ratio of the rigid particles to the elastic matrix is ​​1.8-2.2 parts by weight: 1 part by weight, and the particle size of the particles formed by the rigid particles is 2-15 mm.

10. The pressure-balanced abandoned mine tunnel filling and buried pipeline compressed air energy storage structure according to claim 8, characterized in that: The rigid particles include at least one of sand, ore, and steel slag; Optionally, the elastic layer or the elastic matrix is ​​made of at least one of rubber and plastic.

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