Corner plugging body and chamber structure

Abstract

The utility model relates to the technical field of compressed air energy storage, in particular to a corner plugging body and a chamber structure. The plugging body is arranged at the position of the L-shaped corner where the gas storage chamber and the traffic tunnel intersect, the pressure difference thrust action inside and outside the gas storage chamber is converted from plugging body bearing to surrounding rock bearing, the stress performance of the plugging body is improved, the length of the plugging body is shortened, and the engineering investment of the plugging body is reduced; correspondingly, in order to achieve the storage function of the gas storage chamber, a gas inlet and outlet pipeline used for air inlet and outlet also needs to be arranged in a bent mode so as to adapt to the L-shaped arrangement positions of the gas storage chamber and the traffic hole.

Description

TECHNICAL FIELD

[0001] The utility model relates to compressed air energy storage technology field, especially a corner plugging body and chamber structure. BACKGROUND

[0002] Compressed air energy storage technology is a new energy storage method using high-pressure air to store energy, and its working principle is that when the power grid load is low, the excess energy in the power grid is used to drive a compressor to compress air and store it in a gas storage device. When the power grid load is high, the high-pressure air is released to drive an expander to work, converting the stored energy into electrical energy. In this technology, a tunnel-type underground artificial chamber as a gas storage device has the advantages of convenient construction, safety and reliability, flexible layout method, and becomes an important part of compressed air energy storage power station. The internal pressure of the tunnel-type underground gas storage chamber for compressed air energy storage can reach 10-15 MPa. The structure is generally provided with a sealing structure and a lining structure from the inside out, and a plugging body is arranged at the inlet end to plug the gas storage chamber to ensure that the chamber is sealed reliably under the action of the internal and external pressure difference. The plugging body is usually made of concrete to balance the axial thrust generated by the high-pressure gas in the gas storage cavity. The conventional design method of the plugging body mainly uses the cohesion and friction between the concrete and the surrounding rock, as well as the external anchoring force of the local structure to balance the internal and external pressure difference of the chamber. By adjusting the length of the plugging body, the thrust of the high-pressure gas storage chamber is balanced, resulting in a relatively long design length of the plugging body, which does not fully utilize the compressive strength of the concrete, and thus the cost of the plugging body is relatively high. Therefore, it is necessary to combine the relevant characteristics of the design of the deep underground high-pressure gas storage chamber structure to seek a plugging structure that can fully utilize the compressive strength of the concrete, meet the safety requirements, improve the stress form of the plugging body, and reduce the engineering quantity and investment.

[0003] At present, there are self-balancing plugging body structure forms, such as the self-balancing sealing plug in the scheme disclosed in application No. 202210665443.7, which is mainly applied at the T-shaped intersection of the chamber inlet. The self-balancing sealing plug is provided with a T-shaped passage inside, which connects the gas storage chamber at both ends of the inclined shaft and the sealing plug. By forming a balanced air pressure at both ends of the axial passage of the sealing plug, the safety and sealing performance of the gas storage chamber is enhanced, fully utilizing the compressive strength of the concrete and the characteristics of the chamber energy storage structure, and improving the stress performance of the plugging body, thereby reducing the length of the plugging body and the cost of the plugging body. However, the chamber structure arranged with this plugging body structure is not conducive to maintenance, and the chamber group adopts a parallel working mode. For example, when a single gas storage chamber at either end of the self-balancing sealing plug needs to be repaired, all gas storage chambers need to be deflated first to allow maintenance personnel to enter the chamber. The amount of deflation is large, the implementation is difficult, and the economy is poor.

[0004] Therefore, it is necessary to further seek a plugging body which can improve the stress form of the plugging body, reduce the engineering quantity of the plugging body, reduce investment, and also reduce the maintenance difficulty of the chamber group. Practical new type content

[0005] The utility model discloses a corner plugging body and chamber structure, and aims at the problems of complex stress, long design length and high cost of the plugging body for plugging the air inlet of the gas storage chamber in the prior art.

[0006] In order to realize the above-mentioned purpose, the utility model adopts the technical scheme that:

[0007] A corner plugging body, comprising a plugging body body, the plugging body body is arranged at the L-shaped corner position where the gas storage chamber and the traffic tunnel intersect, the plugging body body extends to the traffic tunnel and is connected with the side wall of the traffic tunnel, and the air thrust in the gas storage chamber can be resisted by the surrounding rock of the side wall of the traffic tunnel.

[0008] The utility model discloses a corner plugging body and chamber structure, and aims at the problems of complex stress, long design length and high cost of the plugging body for plugging the air inlet of the gas storage chamber in the prior art.

[0009] The corner plugging body is used for plugging the gas storage chamber at the L-shaped corner position when the chamber group is independently operated, and the maintenance difficulty of the chamber group adopting the independent operation mode is low.

[0010] As a preferred scheme of the utility model, the plugging body body is L-shaped, that is, a part of the plugging body body is coaxially arranged with the gas storage chamber, and another part of the plugging body body is arranged beyond the position of the side wall of the gas storage chamber and coaxially arranged with the traffic tunnel.

[0011] As a preferred scheme of the utility model, the end of the plugging body body towards the gas storage chamber is concave, so that the air flow has good transition when the gas is discharged, the stress of the lining structure is reduced, the energy loss is reduced, and the engineering quantity of the plugging head is further reduced.

[0012] As a preferred scheme of the utility model, the end face of the plugging body body towards the gas storage chamber is a conical face or a hemispherical face.

[0013] As a preferred scheme of the utility model, a manhole and a sealing door are further arranged in the plugging body body, the manhole is arranged in a curve, one end of the manhole is communicated with the traffic hole, the other end of the manhole is communicated with the gas storage chamber, the sealing door is located at one end of the manhole towards the gas storage chamber, and the gas inlet and outlet pipeline is located at the side of the manhole. The arrangement of the manhole and the sealing door facilitates the maintenance of the chamber.

[0014] As a preferred scheme of the utility model, the turning part of the gas inlet and outlet pipeline is transitioned through an arc segment, the arc segment is an integrated structure of the gas inlet and outlet pipeline, or an arc flow guide plate is arranged at the turning part of the gas inlet and outlet pipeline to reduce the energy loss of the turning part of the gas inlet and outlet pipeline.

[0015] As a preferred scheme of the utility model, one end of the gas inlet and outlet pipeline towards the traffic hole is arranged outside the plugging body body, which facilitates the connection with the gas conveying pipe outside.

[0016] The utility model also provides a chamber structure which comprises a traffic hole, a gas storage chamber and the corner plugging body, the traffic hole is communicated with the outside, the gas storage chamber is communicated with the traffic hole, the gas storage chamber comprises a first gas storage unit, the planar arrangement of the first gas storage unit is linear, the first gas storage unit is arranged at the end of the traffic hole in a cross manner, and the end of the first gas storage unit is connected with the traffic hole through the corner plugging body.

[0017] The chamber structure is arranged in a cross manner at the end of the traffic hole, the corner plugging body is arranged at the inlet end of the first gas storage unit for plugging and sealing, the other side surrounding rock of the traffic hole and the compressive resistance of the concrete of the corner plugging body are utilized to resist the high-pressure gas thrust, the stress performance of the plugging body and the chamber structure is improved significantly, the plugging body has a short design length, and the engineering cost is low.

[0018] As a preferred scheme of the utility model, the traffic hole and the first gas storage unit are arranged horizontally underground, the traffic hole is communicated with the outside through an auxiliary chamber, the two ends of the traffic hole are connected with the first gas storage unit respectively, and the auxiliary chamber is located between the first gas storage units on the two sides.

[0019] As a preferred scheme of the utility model, the gas storage chamber further comprises a second gas storage unit, the second gas storage unit is also arranged in a linear manner, the second gas storage unit and the first gas storage unit are arranged side by side, the second gas storage unit is communicated with the traffic hole, a linear plugging body is arranged in the second gas storage unit, and the linear plugging body is provided with a gas inlet interface.

[0020] Therefore, the corner plugging body has the advantages that:

[0021] The corner plugging body and the chamber structure provided by the utility model make full use of the compression resistance of the plugging body concrete, and solve the problem of the too long plugging body caused by the large lateral frictional resistance, and the engineering quantity is small and the investment is low. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of the arrangement position of a corner plugging body in the chamber structure in embodiment 1;

[0023] Figure 2 is Figure 1 is an enlarged view of A part in the corner plugging body;

[0024] Figure 3 is a structural plan view of a corner plugging body in embodiment 1;

[0025] Figure 4 is Figure 3 is a sectional view at B-B in the corner plugging body;

[0026] Figure 5 is a structural arrangement view of the gas inlet and outlet pipeline when a flow guide plate is arranged at the corner;

[0027] Figure 6 is a plan arrangement view of a chamber structure in embodiment 2;

[0028] Figure 7 is an elevation view of an auxiliary chamber;

[0029] Figure 8 is a plan arrangement view of a chamber structure in embodiment 3.

[0030] Figures: 1-gas storage chamber; 11-first gas storage unit; 12-second gas storage unit; 2-plugging body body; 21-gas inlet and outlet pipeline; 211-flow guide plate; 22-manhole; 3-traffic tunnel; 4-linear plugging body; 5-auxiliary chamber. DETAILED DESCRIPTION

[0031] The utility model will be described in detail in combination with the drawings.

[0032] In order to make the purpose, 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 embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] Example 1

[0034] A corner plugging body, such as Figures 1-4 As shown, it includes a sealing body 2, which is arranged at the L-shaped corner position where the gas storage chamber 1 and the traffic tunnel 3 intersect, wherein the gas storage chamber 1 is a chamber for storing compressed air, and the traffic tunnel 3 is a chamber for transportation, and the traffic tunnel 3 is connected to the outside; the sealing body 2 extends toward the traffic tunnel 3 and is connected to the side wall of the traffic tunnel 3, and can resist the air thrust in the gas storage chamber 1 through the surrounding rock of the side wall of the traffic tunnel 3; a gas inlet and outlet pipe 21 is provided in the sealing body 2, and the gas inlet and outlet pipe 21 is used to connect the gas storage chamber 1 and the traffic tunnel 3, and the gas inlet and outlet pipe 21 is set in an L-shaped bend.

[0035] This embodiment sets a sealing body at the L-shaped corner where the gas storage chamber 1 and the traffic tunnel 3 intersect, so that the thrust of the pressure difference between the inside and outside of the gas storage chamber 1 is converted from being borne by the sealing body to being borne by the surrounding rock, thereby improving the bearing performance of the sealing body, shortening the length of the sealing body, and reducing the investment in the sealing body project; accordingly, in order to realize the storage function of the gas storage chamber 1, the gas inlet and outlet pipe 21 for air in and out should also be bent to adapt to the L-shaped arrangement of the gas storage chamber 1 and the traffic tunnel 3.

[0036] By adopting the structural form of the above-mentioned corner sealing body, there is no need to expand the local cross-section of the gas storage chamber 1 at the location where the sealing body is set, and the chamber construction is convenient; the above-mentioned corner sealing body is suitable for sealing the gas storage chamber 1 at the L-shaped corner when the chamber group adopts an independent operation condition, and the maintenance difficulty of the chamber group adopting the independent operation mode is relatively low.

[0037] Specifically, in this embodiment, the sealing body 2 is L-shaped, that is, a portion of the sealing body 2 is coaxially arranged with the gas storage chamber 1, and a portion exceeds the side wall of the gas storage chamber 1 and is coaxially arranged with the traffic tunnel 3. The sealing body 2 is concave at one end facing the gas storage chamber 1, which is used for drainage, so that the airflow has a better transition during deflation, which is beneficial to reduce the stress on the lining structure and reduce energy loss, while further reducing the engineering workload of the sealing head. The end face of the sealing body 2 facing the gas storage chamber 1 can be designed as a conical surface or a hemispherical surface, with a conical slope of 1:3 being appropriate, and the diameter of the hemispherical surface being consistent with the diameter of the gas storage chamber 1.

[0038] For the convenience of later maintenance work, the plugging body 2 is also provided with a manhole 22 and a sealing door. The manhole 22 is curved at the turning position, one end of the manhole 22 is communicated with the traffic hole 3, and the other end of the manhole 22 is communicated with the gas storage chamber 1. The sealing door is located at the end of the manhole 22 facing the gas storage chamber 1, so that the inner side of the four peripheral edges of the sealing door can abut against the plugging body 2 to resist the high-pressure gas thrust, and the structure is safer and more reliable, and the sealing is more convenient to realize. Further, in the embodiment, as shown in Figure 4 the gas inlet and outlet pipeline 21 is located at the side of the manhole 22 and is preferably arranged near the lower part of the plugging body, so that the gas inlet and outlet pipeline 21 can be fixed by the buttress to prevent the gas inlet and outlet pipeline 21 from vibrating violently.

[0039] Further, since the gas flow rate in the gas inlet and outlet pipeline 21 is large, a large speed loss will be generated at the turning position, which will also increase the energy in the gas storage chamber 1. Therefore, the turning position of the gas inlet and outlet pipeline 21 is preferably connected and transitioned by an arc-shaped section in the embodiment, and the arc-shaped section is an integrated structure of the gas inlet and outlet pipeline 21. Alternatively, the turning position of the gas inlet and outlet pipeline 21 is designed as a right-angle structure for the convenience of construction, and correspondingly, an arc-shaped flow guide plate 211 is arranged at the turning position of the gas inlet and outlet pipeline 21 to reduce the energy loss at the turning position of the gas inlet and outlet pipeline 21. The arc-shaped structure at the turning position can eliminate the vortex at the turning position and effectively reduce the flow rate difference between the inner and outer sides of the pipeline after the turning.

[0040] Further, as shown in Figure 5 when the arc-shaped flow guide plate 211 is arranged at the turning position of the gas inlet and outlet pipeline 21, one end of the flow guide plate 211 is parallel to the axis direction of the traffic hole 3 for connecting the gas inlet of the gas inlet and outlet pipeline 21, and the other end of the flow guide plate 211 is parallel to the axis direction of the gas storage chamber 1 for smoothly guiding the inlet gas flow along the arc-shaped surface. Further, the number of flow guide plates 211 is preferably several, and the several flow guide plates 211 are arranged in parallel and at intervals and are arranged obliquely at the corner. The inlet gas flow in the gas inlet and outlet pipeline 21 is divided by the several flow guide plates 211 to reduce the impact energy of the single gas flow and reduce the heat loss. The arrangement of the flow guide plate 211 can reduce the heat loss of the inlet gas flow at the turning position of the pipeline, reduce the entropy of the outlet gas flow, thereby improve the energy utilization rate and increase the gas storage efficiency.

[0041] According to the numerical simulation experiment, for the gas inlet and outlet pipeline 21 with a diameter of 1m, the effect of eliminating the vortex at the turning position of the curved pipeline and reducing the flow rate difference between the inner and outer sides of the pipeline after the turning is better when five flow guide plates 211 are arranged in a row.

[0042] Further, the end of the gas inlet and outlet pipeline 21 facing the traffic hole 3 can be arranged to protrude from the plugging body 2, which is convenient for connecting with the external gas conveying pipe.

[0043] Embodiment 2

[0044] Based on Embodiment 1, this embodiment provides a cavern structure, as shown in Figure 6 、 Figure 7 , which comprises a traffic tunnel 3, a gas storage cavern 1 and the above-mentioned corner sealing body. The traffic tunnel 3 is connected with the outside world, the gas storage cavern 1 is connected with the traffic tunnel 3, and the gas storage cavern 1 comprises a first gas storage unit 11. The first gas storage unit 11 is arranged in a linear plane, and the first gas storage unit 11 is arranged at the end of the traffic tunnel 3. The end of the first gas storage unit 11 is connected with the traffic tunnel 3 through the corner sealing body.

[0045] Further, in this embodiment, the traffic tunnel 3 and the first gas storage unit 11 are both arranged horizontally underground, and the traffic tunnel 3 is connected with the outside world through an auxiliary cavern 5. The two ends of the traffic tunnel 3 are respectively connected with the first gas storage unit 11, and the auxiliary cavern 5 is located between the two first gas storage units 11. The axis direction of the first gas storage unit 11 is perpendicular to the axis direction of the traffic tunnel 3. The auxiliary cavern 5 adopts a slope, and the connection between the slope and the traffic tunnel 3 is not provided with a sealing structure, so as to facilitate the transportation of large equipment by vehicles.

[0046] In use, the special equipment for converting compressed air on the ground can be connected to the gas inlet and outlet pipeline 21 of the corner sealing body through the auxiliary cavern 5 and the traffic tunnel 3. The two first gas storage units 11 at the two ends of the traffic tunnel 3 can be independently operated and do not interfere with each other. When one of the first gas storage units 11 needs daily maintenance, the first gas storage unit 11 that needs to be maintained at present is discharged, and the other first gas storage unit 11 that does not need to be maintained can maintain a normal working state, which has little effect on the operation and maintenance of the power station.

[0047] In the above-mentioned cavern structure, the first gas storage unit 11 is arranged at the end of the traffic tunnel 3, and the corner sealing body is arranged at the inlet end of the first gas storage unit 11 to seal. The other side of the traffic tunnel 3 and the concrete of the corner sealing body itself resist the high-pressure gas thrust by the compression resistance, which significantly improves the stress form of the sealing body and the cavern structure, overcomes the problem that the sealing body is designed to be too long due to the excessive lateral friction resistance in the conventional design, further reduces the cost and construction period of the sealing body, and also reduces the length of the gas transmission path and the maintenance passage, which is convenient for later maintenance operation.

[0048] Embodiment 3

[0049] Based on Embodiment 2, this embodiment also provides a cavern structure. As shown in Figure 8As shown, the air storage chamber 1 for storing compressed air in the embodiment also comprises a second air storage unit 12, the second air storage unit 12 is also arranged in a linear form, the second air storage unit 12 and the first air storage unit 11 are arranged side by side, and the second air storage unit 12 is communicated with the traffic tunnel 3. A linear blocking body 4 in a conventional form is arranged in the second air storage unit 12, the linear blocking body 4 can adopt a wedge-shaped structure with a long length or adopt an expanded cross-section structure, a T-shaped tunnel is formed between the linear blocking body 4 and the traffic tunnel 3, and the linear blocking body 4 is convenient for the transportation vehicles to pass through; and the linear blocking body 4 is correspondingly provided with an air inlet interface for communicating the second air storage unit 12 and the traffic tunnel 3. The first air storage unit 11 and the second air storage unit 12 are independently arranged, and the gas conveying pipes connecting the first air storage unit 11 and the second air storage unit 12 can be converged through a special three-way joint, the pipeline transportation arrangement in the chamber is simplified, the three-way joint should be adapted to the compressed air energy storage working condition, and has certain temperature resistance and pressure resistance characteristics.

[0050] The above only provides a preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A corner sealing body, characterized in that: The invention comprises a blocking body body (2), wherein the blocking body body (2) is arranged at an L-shaped corner position where the gas storage chamber (1) and the traffic tunnel (3) intersect, and the blocking body body (2) extends toward the traffic tunnel (3) and is connected to the side wall of the traffic tunnel (3), and can resist the air thrust in the gas storage chamber (1) through the surrounding rock of the side wall of the traffic tunnel (3); a gas inlet and outlet pipe (21) is provided in the blocking body body (2), and the gas inlet and outlet pipe (21) is used to connect the gas storage chamber (1) and the traffic tunnel (3), and the gas inlet and outlet pipe (21) is arranged in an L-shaped bend.

2. The corner sealing body according to claim 1, characterized in that: The blocking body (2) is L-shaped.

3. The corner sealing body according to claim 1, characterized in that: One end of the sealing body (2) facing the gas storage chamber (1) is concavely arranged.

4. The corner sealing body according to claim 3, characterized in that: The end surface of the sealing body (2) facing the gas storage chamber (1) is a conical surface or a hemispherical surface.

5. The corner sealing body according to claim 1, characterized in that: A manhole (22) and a sealing door are further provided in the sealing body body (2); the manhole (22) is curved, one end of the manhole (22) is connected to the traffic tunnel (3), and the other end of the manhole (22) is connected to the gas storage chamber (1); the sealing door is located at the end of the manhole (22) facing the gas storage chamber (1); and the gas inlet and outlet pipe (21) is located on the side of the manhole (22).

6. The corner sealing body according to any one of claims 1 to 5, characterized in that: The turning point of the gas inlet and outlet pipe (21) is transitioned through an arc segment, and the arc segment is a structure integrally formed with the gas inlet and outlet pipe (21); or an arc guide plate (211) is provided at the turning point of the gas inlet and outlet pipe (21).

7. The corner sealing body according to claim 6, characterized in that: One end of the gas inlet and outlet pipe (21) facing the traffic hole (3) extends out of the blocking body (2).

8. A chamber structure, characterized in that: The invention comprises a traffic hole (3), an air storage chamber (1) and a corner sealing body according to any one of claims 1 to 7, wherein the traffic hole (3) is communicated with the outside, the air storage chamber (1) is communicated with the traffic hole (3), the air storage chamber (1) comprises a first air storage unit (11), the plane arrangement of the first air storage unit (11) is linear, the first air storage unit (11) is cross-arranged at the end of the traffic hole (3), and the end of the first air storage unit (11) is connected to the traffic hole (3) through the corner sealing body.

9. The chamber structure according to claim 8, characterized in that: The traffic tunnel (3) and the first gas storage unit (11) are both arranged horizontally underground, and the traffic tunnel (3) is connected to the outside through an auxiliary chamber (5); the two ends of the traffic tunnel (3) are respectively connected to the first gas storage unit (11), and the auxiliary chamber (5) is located between the first gas storage units (11) on both sides.

10. The chamber structure according to claim 8 or 9, characterized in that: The gas storage chamber (1) further comprises a second gas storage unit (12), which is also arranged in a linear shape. The second gas storage unit (12) and the first gas storage unit (11) are arranged in parallel, and the second gas storage unit (12) is connected to the traffic tunnel (3). A linear blocking body (4) is provided in the second gas storage unit (12), and an air inlet interface is led out of the linear blocking body (4).

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