An underground gas storage

Abstract

The present application relates to a kind of underground gas storage, including gas storage body, first drain pipe and multiple second drain pipes, the gas storage body includes supporting layer and the sealing layer being arranged in the supporting layer, the multiple second drain pipes and at least part of the first drain pipe are arranged between the supporting layer and the sealing layer, the second drain pipe is annularly arranged and is sleeved on the gas storage body, the multiple second drain pipes are spaced apart in the length direction of the gas storage body, the first drain pipe is located at the bottom of the gas storage body, each second drain pipe is communicated with the first drain pipe, water inlet is formed on the second drain pipe, and the end of the first drain pipe away from the gas storage body forms drain port.The underground gas storage provided in the present application solves the problem that the operation process of the existing gas storage cavern drainage system is complicated and the operation cost is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressed gas storage, in particular to an underground gas storage. BACKGROUND

[0002] With the accelerating pace of global energy transformation, the seasonal and intermittent nature of renewable energy has prompted the industry to seek underground gas energy storage technologies, such as compressed air energy storage and hydrogen energy storage, to achieve stable energy supply. In the process of exploring efficient and reliable compressed air energy storage technology, the design and performance of the drainage system of the underground gas storage as a key component are particularly important.

[0003] Traditionally, the compressed air energy storage chamber has water seepage inside due to the cracking of surrounding rock and shotcrete, which not only reduces the effective gas storage space, but also threatens the performance of the sealing material, thereby affecting the reliability of the entire energy storage system. Current drainage solutions, such as pipe column water diversion, water collection well collection, and water pump extraction, although solve the problem of water seepage to some extent, but the operation process is relatively complicated and the running cost is high, resulting in low drainage efficiency and practicability. SUMMARY

[0004] The main purpose of the present application is to provide an underground gas storage, which aims to solve the problem of complicated operation process and high running cost of the existing gas storage chamber drainage system.

[0005] To achieve the above purpose, the underground gas storage provided by the present application comprises a gas storage body, a first drainage pipe and a plurality of second drainage pipes, the gas storage body comprises a supporting layer and a sealing layer arranged in the supporting layer, the plurality of second drainage pipes and at least part of the first drainage pipe are arranged between the supporting layer and the sealing layer, the second drainage pipe is arranged in a ring shape and is sleeved on the gas storage body, the plurality of second drainage pipes are arranged at intervals in the length direction of the gas storage body, the first drainage pipe is located at the bottom of the gas storage body, each second drainage pipe is in communication with the first drainage pipe, a water inlet hole is formed on the second drainage pipe, and a drainage port is formed at the end of the first drainage pipe away from the gas storage body.

[0006] According to some embodiments of the present application, a water pressure control assembly is further included, the water pressure control assembly comprises a pressure regulating valve and a plurality of water pressure monitoring sensors, the pressure regulating valve is arranged on the first drainage pipe, the plurality of water pressure monitoring sensors are respectively arranged in the first drainage pipe and the plurality of second drainage pipes, and the pressure regulating valve and the plurality of water pressure monitoring sensors are electrically connected with a controller.

[0007] According to some embodiments of the present application, a filling layer is arranged between the supporting layer and the sealing layer, and the first drainage pipe and the plurality of second drainage pipes are embedded in the filling layer.

[0008] According to some embodiments of the present application, the water inlet holes are provided in plurality.

[0009] According to some embodiments of the present application, the second drainage pipe comprises a first pipe segment at the upper portion of the gas storage body and a second pipe segment at the lower portion of the gas storage body, the water inlet holes on the first pipe segment are arranged on the side of the second drainage pipe facing away from the sealing layer, and the water inlet holes on the second pipe segment are arranged on the side of the second drainage pipe facing the sealing layer.

[0010] According to some embodiments of the present application, the water inlet holes on the second drainage pipe are arranged from dense to sparse in the direction from top to bottom.

[0011] According to some embodiments of the present application, the first drainage pipe is arranged to be inclined downwardly away from the gas storage body.

[0012] According to some embodiments of the present application, the first drainage pipe is provided with water collecting holes on the pipe segment close to the gas storage body.

[0013] According to some embodiments of the present application, each of the second drainage pipes is connected to the first drainage pipe through a connecting piece, and the connecting piece is arranged to be telescopic.

[0014] According to some embodiments of the present application, a water collecting pool is further provided, the water collecting pool is connected to the drainage port, the bottom of the water collecting pool is connected to a water outlet pipe, and a valve is arranged on the water outlet pipe.

[0015] The present application has at least the following beneficial effects:

[0016] In the application, the gas storage body comprises a supporting layer and a sealing layer arranged in the supporting layer, the plurality of second drainage pipes and at least part of the first drainage pipe are arranged between the supporting layer and the sealing layer, the second drainage pipes are arranged in a ring shape and are sleeved on the gas storage body, the plurality of second drainage pipes are arranged at intervals in the length direction of the gas storage body, the first drainage pipe is located at the bottom of the gas storage body, each second drainage pipe is communicated with the first drainage pipe, the second drainage pipe is provided with a water inlet hole, and the end of the first drainage pipe away from the gas storage body is provided with a drainage port. When the underground water seeps into the supporting layer of the gas storage body, the underground water can only enter the second drainage pipe between the supporting layer and the sealing layer due to the sealing of the sealing layer, and the water flows through the second drainage pipe into the first drainage pipe under the action of gravity, and is finally discharged from the drainage port. The application realizes water diversion through the plurality of second drainage pipes, and realizes water collection and drainage through the second drainage pipes. After the pipeline is arranged, no complex operation process is needed, and the underground water is automatically discharged from the gas storage body under the action of gravity. Compared with the existing drainage scheme of water diversion through a pipe column, water collection in a water collecting well and water pumping, the operation process is greatly simplified, and the operation cost is reduced. The seepage water around the gas storage body is completely and efficiently discharged, which not only maximally guarantees the effective gas storage space, but also significantly enhances the performance and service life of the sealing material, and further improves the overall gas storage efficiency and system reliability. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 A top view of the underground gas storage provided by the embodiment of the present application;

[0019] Figure 2 A sectional view of the gas storage body in Figure 1 ;

[0020] Figure 3 A structure schematic view of the underground gas storage in Figure 1 after removing the gas storage body;

[0021] Figure 4 A connection structure view of the first drainage pipe and the second drainage pipe in Figure 1 ;

[0022] Reference numerals:

[0023] 100 - underground gas storage; 1 - gas storage body; 11 - supporting layer; 12 - sealing layer; 13 - filling layer; 2 - first drainage pipe; 21 - drainage opening; 3 - second drainage pipe; 31 - water inlet hole; 32 - first pipe section; 33 - second pipe section; 4 - water pressure regulating assembly; 41 - pressure regulating valve; 5 - connecting piece; 6 - water collecting pool; 61 - water outlet pipe. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0025] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0026] In addition, if the embodiments of the present application involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes A scheme, or B scheme, or A and B schemes. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of a person skilled in the art. When the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope of the present application.

[0027] The present application provides an underground gas storage, Figures 1 to 4 The present application provides an underground gas storage.

[0028] As Figures 1 to 3As shown, the underground gas storage 100 provided by the embodiment of the present application comprises a gas storage body 1, a first drainage pipe 2 and a plurality of second drainage pipes 3. The gas storage body 1 comprises a supporting layer 11 and a sealing layer 12 arranged in the supporting layer 11. The plurality of second drainage pipes 3 and at least part of the first drainage pipe 2 are arranged between the supporting layer 11 and the sealing layer 12. The second drainage pipes 3 are arranged in a ring shape and are sleeved on the gas storage body 1. The plurality of second drainage pipes 3 are arranged at intervals in the length direction of the gas storage body 1. The first drainage pipe 2 is located at the bottom of the gas storage body 1. Each of the second drainage pipes 3 is in communication with the first drainage pipe 2. Water inlets 31 are formed in the second drainage pipes 3. The end of the first drainage pipe 2 away from the gas storage body 1 is provided with a drainage outlet 21.

[0029] In the present application, the gas storage body 1 comprises a supporting layer 11 and a sealing layer 12 arranged in the supporting layer 11. The plurality of second drainage pipes 3 and at least part of the first drainage pipe 2 are arranged between the supporting layer 11 and the sealing layer 12. The second drainage pipes 3 are arranged in a ring shape and are sleeved on the gas storage body 1. The plurality of second drainage pipes 3 are arranged at intervals in the length direction of the gas storage body 1. The first drainage pipe 2 is located at the bottom of the gas storage body 1. Each of the second drainage pipes 3 is in communication with the first drainage pipe 2. Water inlets 31 are formed in the second drainage pipes 3. The end of the first drainage pipe 2 away from the gas storage body 1 is provided with a drainage outlet 21. When underground water seeps into the supporting layer 11 of the gas storage body 1, due to the sealing of the sealing layer 12, the underground water can only enter the second drainage pipes 3 located between the supporting layer 11 and the sealing layer 12. Since the first drainage pipe 2 is located at the bottom of the gas storage body 1 and is connected with each of the second drainage pipes 3, water flows through the second drainage pipes 3 into the first drainage pipe 2 under the action of gravity, and is finally discharged from the drainage outlet 21. The present application realizes water diversion through the plurality of second drainage pipes 3, and realizes water collection and drainage through the second drainage pipes 3. After the pipeline is laid, no complex operation process is required. Underground water is automatically discharged from the gas storage body 1 under the action of gravity. Compared with the existing drainage scheme of water diversion through a pipe column, water collection by a water collection well and water pumping, the operation process is greatly simplified, and the operation cost is reduced. By completely and efficiently discharging the seepage water around the gas storage body 1, the effective gas storage space is maximized, the performance and service life of the sealing material are significantly improved, and the overall gas storage efficiency and system reliability are improved.

[0030] It should be noted that the gas storage body 1 is arranged in a cylindrical shape. The distance between two adjacent second drainage pipes 3 is less than half of the radius of the gas storage body 1.

[0031] Specifically, the supporting layer 11 is made of sprayed concrete, and the sealing layer 12 is spliced by multiple steel plate linings.

[0032] In some embodiments, geotextile is wrapped on the second drain pipe 3 to filter solid particles and prevent solids from entering the second drain pipe 3 and blocking the pipe and affecting drainage.

[0033] The first drain pipe 2 and the second drain pipe 3 are both made of metal material to avoid deformation of the first drain pipe 2 and the second drain pipe 3 under internal pressure after the gas storage body 1 is filled with compressed gas, which leads to failure of drainage and affects the stability of the sealing structure.

[0034] When the gas storage body 1 is filled with compressed gas, a large internal pressure is applied to the sealing layer 12, and at this time, a large water pressure needs to be applied to the sealing layer 12 by underground water to offset part of the internal pressure and avoid deformation of the sealing layer 12. When the compressed gas in the gas storage body 1 is gradually output, the internal pressure decreases, and the water pressure needs to be reduced to maintain the balance between the gas pressure and the water pressure. Therefore, in some embodiments, as shown in Figure 3 The underground gas storage 100 further includes a water pressure regulating assembly 4, which includes a pressure regulating valve 41 and multiple water pressure monitoring sensors. The pressure regulating valve 41 is arranged on the first drain pipe 2, and the multiple water pressure monitoring sensors are arranged in the first drain pipe 2 and the multiple second drain pipes 3, respectively. The pressure regulating valve 41 and the multiple water pressure monitoring sensors are electrically connected to a controller. In this way, the water pressure at each position is monitored by the multiple water pressure monitoring sensors, and the detected water pressure values are sent to the controller. The controller determines the water pressure regulating value according to the current water pressure value and the gas pressure value in the gas storage body 1 to control the opening degree and opening and closing time of the pressure regulating valve 41, so that the water pressure and the gas pressure are balanced to achieve fine regulation of water pressure during operation and avoid deformation of the sealing layer 12 and affect the sealing performance.

[0035] It should be noted that when the compressed gas in the gas storage body 1 is exhausted, the pressure regulating valve 41 needs to be controlled to be always open to discharge underground water as much as possible to avoid deformation of the sealing layer 12 under the action of water pressure.

[0036] Further, in order to share the internal pressure received by the sealing layer 12, in some embodiments, as shown in Figure 2As shown, the support layer 11 and the sealing layer 12 are provided with a filling layer 13, and the first drain pipe 2 and the plurality of second drain pipes 3 are embedded in the filling layer 13. In this way, on the one hand, the filling layer 13 can transmit the internal pressure of the sealing layer 12 to the support layer 11, avoiding the deformation of the sealing layer 12 due to excessive internal pressure; on the other hand, the filling layer 13 can fill the gaps between the second drain pipes 3, avoiding the accumulation of groundwater. At the same time, the first drain pipe 2 and the plurality of second drain pipes 3 are embedded in the filling layer 13, which can avoid the deformation of the first drain pipe 2 and the second drain pipe 3 due to internal pressure.

[0037] In some embodiments, as shown in Figure 1 As shown, the water inlet hole 31 is provided with a plurality of water inlet holes. By providing a plurality of water inlet holes 31, the water collection efficiency of the second drain pipe 3 is improved.

[0038] The arrangement position of the water inlet hole 31 is not limited, as long as the groundwater can enter the second drain pipe 3 from the water inlet hole 31, for example, in some embodiments, as shown in Figure 3 As shown, the second drain pipe 3 includes a first pipe segment 32 located at the upper part of the gas storage body 1 and a second pipe segment 33 located at the lower part of the gas storage body 1, the water inlet hole 31 on the first pipe segment 32 is arranged on the side of the second drain pipe 3 away from the sealing layer 12, and the water inlet hole 31 on the second pipe segment 33 is arranged on the side of the second drain pipe 3 facing the sealing layer 12. In this way, on the one hand, the groundwater above the gas storage body 1 can enter the second drain pipe 3 under the action of gravity, and on the other hand, for the groundwater below the gas storage body 1, when the groundwater upwells, it can enter the second drain pipe 3 from the water inlet hole 31, avoiding seepage from the sealing layer 12 into the gas storage body 1.

[0039] Since the groundwater above the gas storage body 1 has a larger water pressure acting on the sealing layer 12, and the groundwater below the gas storage body 1 has a smaller water pressure acting on the sealing layer 12, in some embodiments, the plurality of water inlet holes 31 on the second drain pipe 3 are arranged from dense to sparse from top to bottom. In this way, when the compressed gas in the gas storage body 1 is exhausted, the groundwater above the gas storage body 1 can be quickly discharged through the dense water inlet holes 31, avoiding the deformation of the sealing layer 12 under the action of water pressure.

[0040] Further, in some embodiments, the first drain pipe 2 is inclined downward away from the gas storage body 1. In this way, the groundwater in the first drain pipe 2 can be discharged faster under the action of gravity.

[0041] In some embodiments, the first drain pipe 2 is provided with a plurality of water collecting holes on the pipe section close to the gas storage body 1. By providing the plurality of water collecting holes, the discharge efficiency of the underground water at the bottom of the gas storage body 1 is improved, and the underground water is prevented from seeping into the gas storage body 1 from the sealing layer 12.

[0042] In some embodiments, as shown in Figure 4 each second drain pipe 3 is connected to the first drain pipe 2 through a connecting piece 5, and the connecting piece 5 is provided in an extendable manner. In this way, the connection between the first drain pipe 2 and the second drain pipe 3 is deformed under the action of the internal air pressure, which affects the drainage efficiency.

[0043] In order to improve the resource utilization, in some embodiments, as shown in Figure 3 the underground gas storage 100 further comprises a water collecting pool 6, the water collecting pool 6 is connected to the drain port 21, the bottom of the water collecting pool 6 is connected to a water outlet pipe 61, and the water outlet pipe 61 is provided with a valve. In this way, the underground water can be collected in the water collecting pool 6 and transported to the water using area through the water outlet pipe 61, so as to improve the utilization rate of the underground water.

[0044] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An underground gas storage facility with adjustable and controllable drainage function, characterized in that, The system includes a gas storage tank, a first drain pipe, and multiple second drain pipes. The gas storage tank includes a support layer and a sealing layer disposed within the support layer. The multiple second drain pipes and at least a portion of the first drain pipes are disposed between the support layer and the sealing layer. The second drain pipes are arranged in a ring and sleeved on the gas storage tank. The multiple second drain pipes are spaced apart along the length of the gas storage tank. The first drain pipe is located at the bottom of the gas storage tank. Each second drain pipe is connected to the first drain pipe. The second drain pipes have water inlets. The end of the first drain pipe away from the gas storage tank has a drain outlet. It also includes a water pressure control component, which includes a pressure regulating valve and multiple water pressure monitoring sensors. The pressure regulating valve is located on the first drain pipe, and the multiple water pressure monitoring sensors are respectively located in the first drain pipe and the multiple second drain pipes. The pressure regulating valve and the multiple water pressure monitoring sensors are all electrically connected to the controller. The water pressure at various locations is monitored by multiple water pressure monitoring sensors, and the detected water pressure values ​​are sent to the controller. The controller determines the water pressure control value based on the current water pressure value and the gas pressure value in the gas storage tank, thereby controlling the opening degree and opening and closing time of the pressure regulating valve to maintain the balance between water pressure and gas pressure, so as to achieve fine-grained water pressure control during operation. A filling layer is provided between the support layer and the sealing layer, and the first drainage pipe and the multiple second drainage pipes are all embedded in the filling layer.

2. The underground gas storage facility as described in claim 1, characterized in that, The water inlet has multiple holes.

3. The underground gas storage facility as described in claim 2, characterized in that, The second drain pipe includes a first pipe section located at the upper part of the gas storage tank and a second pipe section located at the lower part of the gas storage tank. The water inlet on the first pipe section is located on the side of the second drain pipe facing away from the sealing layer, and the water inlet on the second pipe section is located on the side of the second drain pipe facing the sealing layer.

4. The underground gas storage facility as described in claim 2, characterized in that, The multiple water inlets on the second drain pipe are arranged from dense to sparse in the direction from top to bottom.

5. The underground gas storage facility as described in claim 1, characterized in that, The first drain pipe is inclined downwards in a direction away from the gas storage tank.

6. The underground gas storage facility as described in claim 1, characterized in that, The first drain pipe has multiple water collection holes on the pipe section near the gas storage tank.

7. The underground gas storage facility as described in claim 1, characterized in that, Each of the second drain pipes is connected to the first drain pipe via a connector, which is telescopically oriented.

8. The underground gas storage facility as described in claim 1, characterized in that, It also includes a water collection tank, which is connected to the drain outlet. The bottom of the water collection tank is connected to a water outlet pipe, and a valve is provided on the water outlet pipe.

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