An underground high-pressure gas storage system

Abstract

The present invention provides an underground high-pressure gas storage system, comprising: an annular chamber, a transverse passage, a vertical shaft, and a blind head; the annular chamber is connected end to end through the blind head to form a gas storage space; the side walls of the annular chamber include, from the inside to the outside, a corrugated arch steel lining assembly and a lining structure; one end of the transverse passage is connected to the annular chamber through the blind head, and the other end is connected to the bottom end of the vertical shaft, and the top end of the vertical shaft is connected to the ground; the blind head is arranged at the connection between the transverse passage and the annular chamber. The application of the present invention can reduce the force exerted by gas pressure on the steel lining, thereby greatly reducing the thickness of the steel lining and saving investment. Furthermore, it is more convenient to construct the steel lining, significantly improving construction efficiency.

Description

Technical Field

[0001] The present application relates to the field of underground engineering technology, and in particular to an underground high-pressure gas storage system. Background Art

[0002] Large-scale energy storage technology is key to addressing the issues of wind and solar power curtailment, significantly improving renewable energy consumption, promoting the shift from fossil fuels to renewable energy, and achieving carbon peak and carbon neutrality. Compressed air energy storage is considered the most promising physical energy storage technology, offering advantages such as large scale, low cost, long life, and environmental friendliness.

[0003] Prior art typically uses compressed air energy storage by installing gas storage vessels within underground caverns. This method primarily relies on the tensile strength of the vessel's steel lining to withstand the high pressure of the stored gas. To increase the steel lining's load-bearing capacity, the thickness of the lining often needs to reach 30 to 100 mm, making construction difficult and investment expensive. Summary of the Invention

[0004] In view of this, the present invention provides an underground high-pressure gas storage system, which can use the stability of the surrounding rock itself to bear the high pressure of the stored gas, reduce the thickness of the steel plate, and reduce the project investment.

[0005] The technical solution of the present invention is specifically achieved as follows:

[0006] An underground high-pressure gas storage system comprises: an annular chamber, a horizontal passage, a vertical shaft and a blind head;

[0007] The annular chamber is connected end to end through a blind head to form a gas storage space; the side wall of the annular chamber includes a corrugated arch steel lining assembly and a lining structure from the inside to the outside;

[0008] One end of the transverse passage is connected to the annular chamber through a blind head, and the other end is connected to the bottom end of the vertical shaft, and the top end of the vertical shaft is connected to the ground;

[0009] The blind head is arranged at the connection between the transverse channel and the annular chamber.

[0010] Preferably, the underground high-pressure gas storage system further includes an inclined well, one end of which is connected to the annular chamber and the other end is connected to the ground, serving as a construction channel during the construction of the underground high-pressure gas storage system and being blocked by a blocking body during operation.

[0011] Preferably, the corrugated arch steel lining assembly comprises: a steel lining, fiberglass reinforced plastic, a rubber pad and a lubricating layer;

[0012] The steel liner is evenly provided with a plurality of corrugated arches protruding inwardly along its circumference, and each corrugated arch extends along the axial direction of the steel liner;

[0013] The outside of each corrugated arch is fixed with fiberglass that matches the shape of the corrugated arch, and the outside of the fiberglass is fixed with a rubber pad;

[0014] A lubricating layer is provided between the steel lining and the lining structure, and between the rubber pad at the corrugated arch and the lining structure.

[0015] Preferably, a water collecting trough is provided at the bottom of the bulkhead, which is connected to the transverse channel through a pipe; the corrugated arch steel lining assembly further includes a drainage blind pipe, which is provided in the middle of the fiberglass and rubber pad at each corrugated arch along the extension direction of the annular chamber, and the two ends of the drainage blind pipe are connected to the water collecting trough at the bottom of the bulkhead.

[0016] Preferably, the steel lining is formed by splicing together a plurality of steel lining unit segments arranged along the axial direction of the annular chamber, and each steel lining unit segment is formed by splicing together a plurality of steel plates with corrugated arches in the circumferential direction.

[0017] Preferably, the multiple steel lining unit sections are welded and fixed, and the multiple steel plates of each steel lining unit section are welded and fixed to form welds; the welds are fully penetrated single-sided butt groove welds, and the grooves are pre-milled into fan shapes in the factory, and the angle corresponding to the weld is 60°.

[0018] Preferably, the lining structure includes, from the inside to the outside, reinforced concrete secondary lining, waterproof layer and initial support structure.

[0019] Preferably, the bulkhead includes two longitudinal joints and one transverse joint, wherein the two longitudinal joints are respectively arranged at both ends of the bulkhead, the transverse joint is arranged in the middle of the bulkhead, and the two longitudinal joints and the transverse joint are connected to each other;

[0020] The two longitudinal joints are respectively connected to the two ends of the annular chamber to form a closed ring; the transverse joint is connected to the transverse channel; the middle part of the blind head is provided with concrete that blocks the two longitudinal joints and one transverse joint, and a three-way channel connecting the two longitudinal joints and the transverse joint is reserved in the concrete; valves are respectively provided on the three passages of the three-way channel.

[0021] Preferably, the outer surface of the blind head is provided with a plurality of ribs along the axis direction of the annular chamber.

[0022] Preferably, the fiberglass is alkali-free fiberglass; and the lubricating layer is an acrylate lubricating layer.

[0023] As can be seen from the above, in the underground high-pressure gas storage system of the present invention, by providing a corrugated arch steel lining assembly, the gas pressure in the annular chamber can be transferred to the surrounding rock of the annular chamber, thereby reducing the force of the gas pressure on the steel lining, thereby greatly reducing the thickness of the steel lining and saving investment. Furthermore, it is more convenient to construct the steel lining, which significantly improves construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 1 is a top view of an underground high-pressure gas storage system in an embodiment of the present invention.

[0025] Figure 2 Schematic cross-sectional view of the annular chamber in an embodiment of the present invention.

[0026] Figure 3 It is a cross-sectional schematic diagram of the corrugated arch steel lining assembly in an embodiment of the present invention.

[0027] Figure 4 for Figure 3 A partial enlarged view of point A in the middle.

[0028] Figure 5 Schematic diagram of a water collection tank in an embodiment of the present invention.

[0029] Figure 6 Schematic diagram of the weld of the steel lining in an embodiment of the present invention.

[0030] Figure 7 Schematic diagram of a steel-lined corrugated arch in an embodiment of the present invention.

[0031] Figure 8 Schematic diagram of the structure of the bulkhead in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] In order to make the technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1 to 8 As shown, the present invention provides an underground high-pressure gas storage system, comprising: an annular chamber 1, a transverse passage 3, a vertical shaft 4 and a blind head 5;

[0034] The annular chamber 1 is connected end to end through a bulkhead 5 to form a gas storage space; the side wall of the annular chamber 1 includes a corrugated arch steel lining assembly 11 and a lining structure 12 from the inside to the outside;

[0035] One end of the transverse passage 3 is connected to the annular chamber 1 through a blind 5, and the other end is connected to the bottom end of the vertical shaft 4, and the top end of the vertical shaft 4 is connected to the ground;

[0036] The blind head 5 is arranged at the connection between the transverse channel 3 and the annular chamber 1 .

[0037] In the technical solution of the present invention, the vertical shaft 4 and the transverse passage 3 can be used as passages for the high-pressure gas pipe, so that the high-pressure gas pipe is connected to the annular chamber 1 through the vertical shaft 3 and the transverse passage 3, so that gas can be transported into the annular chamber or discharged from the annular chamber through the high-pressure gas pipe; in addition, the vertical shaft 4 and the transverse passage 3 can also serve as maintenance passages during the operation of the underground high-pressure gas storage system. Since the annular chamber is set underground, the outer side of the annular chamber is in contact with the surrounding rock. By setting up the corrugated arch steel liner assembly 11, the corrugated arch structure of the steel liner can be used to transfer the main load of the high-pressure gas in the annular chamber 1 to the lining structure 12, and further to the surrounding rock outside the annular chamber. Therefore, the stability of the surrounding rock itself can be used to bear the high pressure of the stored gas, instead of relying solely on the tensile strength of the steel liner itself to bear the high pressure of the stored gas. Therefore, the thickness of the steel liner can be reduced, reducing the project investment.

[0038] In the technical solution of the present invention, a variety of implementation methods can be used to implement the above-mentioned underground high-pressure gas storage system. The following will take one of the implementation methods as an example to introduce the technical solution of the present invention in detail.

[0039] For example, preferably, in a specific embodiment of the present invention, Figure 1 As shown, the underground high-pressure gas storage system can further include an inclined well 2, one end of which is connected to the annular chamber 1, and the other end is connected to the ground, serving as a construction channel during the construction of the underground high-pressure gas storage system, and is blocked by a blocking body during operation.

[0040] By setting up an inclined shaft 2, during the construction of the underground high-pressure gas storage system, the inclined shaft 2 can be used as a passage for personnel entry and exit, waste soil transportation and material transportation during the construction period. After the construction is completed, the inclined shaft 2 is sealed with a sealing body (for example, the sealing body can be concrete), thereby preventing gas leakage from the annular chamber 1 during operation.

[0041] For another example, preferably, in a specific embodiment of the present invention, Figure 3 and Figure 4 As shown, the corrugated arch steel lining assembly 11 may include: a steel lining 101, fiberglass reinforced plastic 102, a rubber pad 103 and a lubricating layer 104;

[0042] The steel liner 101 is evenly provided with a plurality of corrugated arches protruding inwardly thereof in the circumference thereof, and each corrugated arch extends along the axial direction of the steel liner;

[0043] The outer side of each corrugated arch is fixed with a glass fiber reinforced plastic 102 that matches the shape of the corrugated arch, and the outer side of the glass fiber reinforced plastic 102 is fixed with a rubber pad 103;

[0044] A lubricating layer 104 is provided between the steel lining 101 and the lining structure 12 , and between the rubber pad 103 at the corrugated arch and the lining structure 12 .

[0045] Preferably, as an example, the fiberglass 102 can use alkali-free fiberglass. Since alkali-free fiberglass has the characteristics of corrosion resistance, flame retardancy, light weight and aging resistance, alkali-free fiberglass can be used to transfer the gas pressure on the corrugated arch, so that the corrugated arch deforms evenly and prevents the steel lining from bending.

[0046] Preferably, as an example, the lubricating layer 104 may be an acrylate lubricating layer, thereby reducing the friction shear stress between the steel liner and the lining structure 12 and preventing the steel liner from buckling and deforming under the action of shear stress.

[0047] Preferably, as an example, Figure 3 As shown, along the circumference of the steel liner 101 , a corrugated arch may be provided every 20°.

[0048] Preferably, as an example, the thickness of the steel lining 101 may be 15 mm.

[0049] In an embodiment of the present invention, a plurality of corrugated arches extending along the axial direction of the steel liner are provided on the steel liner, and glass fiber reinforced plastics 102 and rubber pads 103 are provided on the outside of each corrugated arch, so that the corrugated arch can be supported. The gas pressure in the annular chamber can be transmitted to the lining structure through the corrugated arch, glass fiber reinforced plastics and rubber pads, and can be further transmitted to the surrounding rock outside the annular chamber, thereby reducing the force of the gas pressure on the steel liner. Therefore, the thickness of the steel liner can be set to 15 mm to meet the requirements, which greatly reduces the thickness of the steel liner and saves investment. Furthermore, it is more convenient to construct the steel liner (for example, welding the steel liner), which significantly improves the construction efficiency. In addition, by providing rubber pads, the air tightness and water tightness of the steel liner can be further improved.

[0050] In addition, preferably, in a specific embodiment of the present invention, Figure 4 and Figure 5 As shown, a water collecting trough 106 may be provided at the bottom of the bulkhead 5, and the water collecting trough 106 is connected to the transverse channel 3 through a pipe 107; the corrugated arch steel lining assembly 11 may further include a drainage blind pipe 105, and the drainage blind pipe 105 is arranged in the middle of the fiberglass reinforced plastic 102 and the rubber pad 103 at each corrugated arch along the extension direction of the annular chamber, and the two ends of the drainage blind pipe 105 are connected to the water collecting trough 106 at the bottom of the bulkhead 5.

[0051] In the technical solution of the present invention, the height of the blind head 5 can be lower than the height of other positions of the annular chamber 1. By providing an annular drainage blind pipe 105, groundwater accumulated in the corrugated arch can penetrate into the drainage blind pipe and flow into the water collection tank 106 through the drainage blind pipe. When the water in the water collection tank 106 reaches a certain height, the water in the water collection tank can be pumped out through the pipe 107 in the transverse channel, thereby timely draining the water accumulated in the corrugated arch.

[0052] In addition, preferably, in a specific embodiment of the present invention, the steel lining 101 can be spliced together by multiple sections of steel lining unit segments arranged along the axial direction of the annular chamber 1, and each section of the steel lining unit segment is spliced together circumferentially by multiple steel plates with corrugated arches.

[0053] Preferably, as an example, Figure 3 As shown, the joint seams of the multiple steel plates with corrugated arches in each steel lining unit segment shall not be located at the position where the corrugated arches of the steel plates are located.

[0054] Preferably, as an example, in a specific embodiment of the present invention, the multiple steel lining unit segments can be welded and fixed, and the multiple steel plates of each steel lining unit segment can also be welded and fixed, forming welds at the welding points.

[0055] In addition, as an example, in a preferred embodiment of the present invention, as Figure 6 As shown, the weld seam of the steel lining can be a full-penetration, single-sided butt-groove weld. The groove 100 is pre-milled in the factory to form a fan, and the corresponding angle a of the weld can be 60°. During underground construction, the outer side of the steel lining abuts the lining structure, making double-sided welding impossible, and only single-sided welding is possible. Therefore, to improve weld quality, a 60° open weld is provided to ensure weld strength.

[0056] Preferably, as an example, the multiple steel lining unit segments arranged along the axial direction of the annular chamber 1 can be staggered, that is, the splicing seams of the steel plates in the first steel lining unit segment are not aligned with the splicing seams of the steel plates in the second steel lining unit segment, thereby improving the reliability of the steel lining.

[0057] In addition, preferably, as an example, in a specific embodiment of the present invention, as Figure 7 As shown, each corrugated arch of the steel liner may be formed by three arc segments continuously pressed by three center circles, wherein the radius R1 of the first arc segment and the third arc segment may be 60 mm, and the radius R2 of the second arc segment may be 140 mm.

[0058] In addition, preferably, in a specific embodiment of the present invention, the lining structure 12 may include, from the inside to the outside, a reinforced concrete secondary lining, a waterproof layer and an initial support structure.

[0059] In addition, as an example, in a preferred embodiment of the present invention, Figure 8 As shown, the bulkhead 5 includes two longitudinal joints 52 and one transverse joint 51, wherein the two longitudinal joints 52 are respectively arranged at the two ends of the bulkhead, and the transverse joint 51 is arranged in the middle of the bulkhead, and the two longitudinal joints 52 and the transverse joint 51 are connected to each other; the two longitudinal joints 52 are respectively connected to the two ends of the annular chamber 1 to form a closed ring; the transverse joint 51 is connected to the transverse channel 3; concrete 53 is provided in the middle of the bulkhead 5 to block the two longitudinal joints 52 and one transverse joint 51, and a three-way channel 54 connecting the two longitudinal joints 52 and the transverse joint 51 is reserved in the concrete 53; valves 541 are respectively provided on the three paths of the three-way channel 54.

[0060] In the technical solution of the present invention, during operation, the three valves 541 are closed, and the annular chamber 1 becomes a closed space. Because concrete 53 is placed within the bulkhead 5, the gas pressure on the left and right sides of the concrete is the product of the gas pressure and the concrete's cross-sectional area. Since the gas pressure in the closed space is constant and the concrete's cross-sectional areas are the same, the gas pressure on the left side of the concrete 53 and the gas pressure on the right side of the concrete 53 are equal and offset each other, thus reaching a state of equilibrium. Since the cross-sectional area of the three-way passage 54 is small, the gas pressure it experiences is also very small, essentially negligible relative to the gas pressure experienced by the concrete cross-section. Therefore, valves 541 are sufficient to withstand the relatively small gas pressure there. Therefore, by providing a bulkhead and concrete within the bulkhead, the high pressure exerted by the gas within the annular chamber on the connection between the annular chamber and the transverse passage 3 when the annular chamber is directly connected to the transverse passage 3 is avoided, thereby ensuring the stability and safety of the annular chamber.

[0061] Furthermore, when the annular chamber needs to be filled or vented, it is only necessary to open the three valves 541 to connect the three-way passage 54 to the high-pressure gas pipes laid in the vertical shaft and the transverse passage, thereby achieving the air intake or venting of the annular chamber. After the operation is completed, the three valves can be closed. When maintenance is required, the three valves can be opened first to release the high-pressure gas stored in the annular chamber, and then the annular chamber can be entered through the vertical shaft 4, the transverse passage 3 and the three-way passage 54 for maintenance. After the maintenance is completed, the high-pressure gas is refilled and the valves are closed.

[0062] Preferably, as an example, the bulkhead 5 can be made of reinforced and thickened steel plate material, and the outer surface of the bulkhead 5 can be provided with multiple ribs along the axis direction of the annular chamber, so as to improve the strength and stability of the bulkhead.

[0063] To sum up, in the technical solution of the present invention, by setting a corrugated arch steel lining assembly, the gas pressure in the annular chamber can be transferred to the surrounding rock of the annular chamber, thereby reducing the force of the gas pressure on the steel lining, thereby greatly reducing the thickness of the steel lining and saving investment. Furthermore, it is more convenient to construct the steel lining, which significantly improves the construction efficiency.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An underground high-pressure gas storage system, characterized in that: include: Annular chambers, cross passages, shafts and blind heads; The annular chambers are connected end to end through a bulkhead to form a gas storage space; The side wall of the annular chamber comprises, from the inside to the outside, a corrugated arch steel lining assembly and a lining structure; One end of the transverse passage is connected to the annular chamber through a blind head, and the other end is connected to the bottom end of the vertical shaft, and the top end of the vertical shaft is connected to the ground; The bulkhead is arranged at the connection between the transverse channel and the annular chamber; The underground high-pressure gas storage system further includes an inclined shaft, one end of which is connected to the annular chamber and the other end is connected to the ground, serving as a construction passage during the construction of the underground high-pressure gas storage system and being blocked by a blocking body during operation; The corrugated arch steel lining assembly comprises: a steel lining, glass fiber reinforced plastic, a rubber pad and a lubricating layer; The steel liner is evenly provided with a plurality of corrugated arches protruding inwardly along its circumference, and each corrugated arch extends along the axial direction of the steel liner; The outside of each corrugated arch is fixed with fiberglass that matches the shape of the corrugated arch, and the outside of the fiberglass is fixed with a rubber pad; A lubricating layer is provided between the steel lining and the lining structure, and between the rubber pad at the corrugated arch and the lining structure; A water collecting trough is provided at the bottom of the bulkhead, which is connected to the transverse channel through a pipe; the corrugated arch steel lining assembly further includes a drainage blind pipe, which is provided in the middle of the fiberglass reinforced plastic and rubber pad at each corrugated arch along the extension direction of the annular chamber, and the two ends of the drainage blind pipe are connected to the water collecting trough at the bottom of the bulkhead.

2. The underground high-pressure gas storage system according to claim 1, characterized in that: The steel lining is formed by splicing together a plurality of steel lining unit segments arranged along the axial direction of the annular chamber, and each steel lining unit segment is formed by splicing together a plurality of steel plates with corrugated arches in the circumferential direction.

3. The underground high-pressure gas storage system according to claim 2, characterized in that: The multiple steel lining unit sections are welded and fixed to each other, and the multiple steel plates of each steel lining unit section are welded and fixed to form welds; the welds are fully penetrated single-sided butt groove welds, and the grooves are pre-milled into fan shapes in the factory, and the angle corresponding to the weld is 60°.

4. The underground high-pressure gas storage system according to claim 1, characterized in that: The lining structure comprises, from the inside to the outside, a reinforced concrete secondary lining, a waterproof layer and an initial support structure.

5. The underground high-pressure gas storage system according to claim 1, characterized in that: The bulkhead includes two longitudinal joints and one transverse joint, wherein the two longitudinal joints are respectively arranged at both ends of the bulkhead, the transverse joint is arranged in the middle of the bulkhead, and the two longitudinal joints and the transverse joint are connected to each other; The two longitudinal joints are respectively connected to the two ends of the annular chamber to form a closed ring; the transverse joint is connected to the transverse channel; the middle part of the blind head is provided with concrete that blocks the two longitudinal joints and one transverse joint, and a three-way channel connecting the two longitudinal joints and the transverse joint is reserved in the concrete; valves are respectively provided on the three passages of the three-way channel.

6. The underground high-pressure gas storage system according to claim 5, characterized in that: The outer surface of the bulkhead is provided with a plurality of ribs along the axis direction of the annular chamber.

7. The underground high-pressure gas storage system according to claim 1, characterized in that: The glass fiber reinforced plastic is alkali-free glass fiber reinforced plastic; and the lubricating layer is an acrylate lubricating layer.

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