Underground cavern temperature and air pressure control system

Abstract

The invention discloses an underground cavern temperature and air pressure control system in the technical field of underground energy storage, which comprises a pressure relief and temperature control cavern arranged beside a gas storage cavern, a first heat transfer pipeline and a second heat transfer pipeline are arranged on a rock wall between the pressure relief and temperature control cavern in a penetrating manner, and the front end of the first heat transfer pipeline extends into the gas storage cavern and is provided with a valve; the second heat transfer pipeline is arranged in the through hole in a sliding mode, the rear end of the second heat transfer pipeline extends into the pressure relief and temperature control cavern, and a spraying device and a driving device are arranged in the pressure relief and temperature control cavern. When the internal air pressure of the gas storage cavern exceeds the standard, valves on the heat transfer pipeline groups are opened to discharge the gas in the gas storage cavern into the pressure relief and temperature control cavern, the pressure of the gas storage cavern is relieved, and when the temperature of the gas storage cavern exceeds the standard, the first heat transfer pipeline and the second heat transfer pipeline are in butt joint, and the spraying device is started to spray the gas in the gas storage cavern. Heat in the gas storage cavern is discharged outwards through the heat transfer pipeline, so that the temperature and the pressure in the gas storage cavern are in a normal state, and long-term safe and stable operation of the gas storage cavern is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground energy storage, in particular to an underground cavern temperature and pressure control system. BACKGROUND

[0002] Compressed air energy storage is a new type of energy storage technology that is rapidly developing. At present, most of the compressed air energy storage power stations that have been built or are being planned use newly built hard rock caverns, and the gas storage pressure reaches more than 10 MPa. The compression of high-pressure gas forms a high-temperature and high-pressure state in the cavern, and in some parts of the cavern, super-high pressure and super-high temperature phenomena may occur, which adversely affect the surrounding rock and structural materials. At present, the main treatment measures for local super-high pressure and super-high temperature in the gas storage cavern are to improve the strength of the surrounding rock and the lining structure and other materials, which is a passive defense measure. How to efficiently and quickly deal with super-high pressure and super-high temperature phenomena has not been reported, so it is necessary to study a compressed air energy storage underground cavern temperature and pressure control system that can alleviate the local super-high pressure and super-high temperature conditions in the gas storage cavern. SUMMARY

[0003] In order to overcome the shortcomings of the existing gas storage cavern that cannot actively deal with local super-high pressure and super-high temperature conditions, the technical problem to be solved by the present application is to provide an underground cavern temperature and pressure control system that can adjust the temperature and pressure in the gas storage cavern.

[0004] The technical scheme adopted by the present application to solve its technical problem is: The underground cavern temperature and pressure control system comprises a gas storage cavern, a pressure relief and temperature control cavern is provided beside the gas storage cavern and is in communication with the outside atmosphere, a plurality of through holes are provided on the rock wall between the two caverns, a heat transfer pipe group is inserted into the through holes, the heat transfer pipe group comprises a first heat transfer pipe close to the gas storage cavern and a second heat transfer pipe close to the pressure relief and temperature control cavern, the first heat transfer pipe is fixed in the through hole, the outer wall of the first heat transfer pipe is sealed with the inner wall of the through hole, the front end of the first heat transfer pipe extends into the gas storage cavern, and a valve is provided at the front end of the first heat transfer pipe, the second heat transfer pipe is slidably arranged in the through hole, the rear end of the second heat transfer pipe extends into the pressure relief and temperature control cavern, a spraying device and a driving device are provided in the pressure relief and temperature control cavern, the driving device can drive the second heat transfer pipe to move back and forth along the through hole, so as to realize the butt joint and disengagement with the first heat transfer pipe.

[0005] Further, the pressure relief and temperature control cavern is arranged in parallel in the middle of the gas storage cavern, the wall thickness between the two caverns is not less than 20 mm, and the length of the pressure relief and temperature control cavern is not less than 1 / 3 of the length of the gas storage cavern.

[0006] Further, the diameters of the first heat transfer pipe and the second heat transfer pipe are 50-70 mm, and the arrangement spacing of adjacent heat transfer pipe groups is 3-5 m. Further, the diameters of the first heat transfer pipe and the second heat transfer pipe are 50-70 mm, and the arrangement spacing of adjacent heat transfer pipe groups is 3-5 m.

[0007] Further, the first heat transfer pipe and the second heat transfer pipe respectively extend into the gas storage chamber and the pressure relief and temperature control chamber by a length of not less than 2 m.

[0008] Further, the rear end of the first heat transfer pipe extends to a position of 2 / 3-3 / 4 from the front of the through hole, and a sealing cover is arranged between the front end side wall of the first heat transfer pipe and the inner wall of the gas storage chamber.

[0009] Further, the first heat transfer pipe and the second heat transfer pipe are both copper pipes.

[0010] Further, the driving device is a hydraulic or electric telescopic rod, the fixed end of which is fixed to the inner wall of the pressure relief and temperature control chamber, and the telescopic end is fixedly connected with the second heat transfer pipe.

[0011] Further, all the second heat transfer pipes are divided into groups, the pipes in each group are fixed together through a connecting piece, and the telescopic end of the driving device is fixedly connected with the connecting piece.

[0012] Further, a control system is further included, a plurality of temperature detectors and pressure detectors are evenly arranged in the gas storage chamber, and the valve, the driving device, the spraying device, the temperature detectors and the pressure detectors are electrically connected with the control system.

[0013] Further, the valve is a pressure valve, and the valve is automatically opened when the pressure in the gas storage chamber exceeds a set threshold.

[0014] The beneficial effects of the present application are as follows: by adding a pressure relief and temperature control chamber beside the gas storage chamber, and arranging a heat transfer pipe group on the rock wall between the two chambers to communicate, when the internal pressure of the gas storage chamber exceeds the standard, the valve on the heat transfer pipe group can be opened to discharge the gas in the gas storage chamber into the pressure relief and temperature control chamber, so as to relieve the pressure of the gas storage chamber, when the temperature of the gas storage chamber exceeds the standard, the first heat transfer pipe and the second heat transfer pipe in the heat transfer pipe group can be connected, and the spraying device can be opened, so that the heat in the gas storage chamber is discharged outward through the heat transfer pipe group, and the gas storage chamber is cooled, so that the temperature and pressure in the gas storage chamber are both in the normal state, and the long-term safe and stable operation of the gas storage chamber is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic diagram of the present application.

[0016] In the figure, 1 is a gas storage chamber, 2 is a pressure relief and temperature control chamber, 3 is a rock wall, 4 is a heat transfer pipe group, 5 is a spraying device, 6 is a driving device, 7 is a control system, 8 is a temperature detector, 9 is a pressure detector, 31 is a through hole, 41 is a first heat transfer pipe, 42 is a second heat transfer pipe, 43 is a valve, and 44 is a sealing cover. Detailed Implementation

[0017] The invention will be further described below with reference to the accompanying drawings.

[0018] It should be noted that if this invention uses directional terms such as up, down, left, right, front, and back, these are for describing the relative positions of components and are not specific references to the absolute positions of related components or the relationships between them. They are only used to explain the relative positional relationships and movements of components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. If this invention uses terms related to quantity such as "many," "multiple," or "several," these specifically refer to two or more.

[0019] Increased area of ​​the mating parts, sealing cover like Figure 1 As shown, the underground cavern temperature and pressure control system provided by the present invention includes a gas storage cavern 1. Next to the gas storage cavern 1 is a pressure relief and temperature control cavern 2 connected to the outside atmosphere. Multiple through holes 31 are provided on the rock wall 3 between the two caverns. A heat transfer pipe group 4 is inserted into the through holes 31. The heat transfer pipe group 4 includes a first heat transfer pipe 41 near the gas storage cavern 1 and a second heat transfer pipe 42 near the pressure relief and temperature control cavern 2. The first heat transfer pipe 41 is fixed in the through hole 31, and its outer wall is sealed to the inner wall of the through hole 31. Its front end extends into the gas storage cavern 1 and is provided with a valve 43 at its front end. The second heat transfer pipe 42 is slidably disposed in the through hole 31, and its rear end extends into the pressure relief and temperature control cavern 2. The pressure relief and temperature control cavern 2 is provided with a spray device 5 and a driving device 6. The driving device 6 can drive the second heat transfer pipe 42 to move back and forth along the through hole 31 to achieve docking and disengagement with the first heat transfer pipe 41.

[0020] The working process of this invention is as follows: when the gas pressure in the gas storage chamber 1 exceeds the set value, valve 43 can be opened to allow the high-pressure gas in the gas storage chamber 1 to be discharged to the depressurization and temperature control chamber 2 through the first heat transfer pipe 41 and the second heat transfer pipe 42, and to the outside, thereby reducing the gas pressure in the gas storage chamber 1. When the pressure reaches the set value, valve 43 is closed. When the gas storage chamber 1 is in normal working condition, the rear end of the first heat transfer pipe 41 and the front end of the second heat transfer pipe 42 are not in contact, and the heat of the gas in the gas storage chamber 1 will not be discharged to the depressurization and temperature control chamber 2 through the first heat transfer pipe 41 and the second heat transfer pipe 42. When the temperature in the gas storage chamber 1 does not exceed the set value, the drive device 6 drives the second heat transfer pipe 42 to move into the through hole 31, so that the front end of the second heat transfer pipe 42 contacts the rear end of the first heat transfer pipe 41. At the same time, the spray device 5 is turned on to cool the second heat transfer pipe 42, and the heat in the gas storage chamber 1 is discharged to the depressurization and temperature control chamber 2 through the first heat transfer pipe 41 and the second heat transfer pipe 42, thereby reducing the temperature in the gas storage chamber 1. If the temperature and pressure in the gas storage chamber 1 exceed the standard, the valve 43 is opened at the same time and the first heat transfer pipe 41 and the second heat transfer pipe 42 are connected, so that the temperature and pressure in the gas storage chamber 1 can quickly return to the set value.

[0021] Considering the structural strength and ease of construction, most current gas storage caverns 1 are linear structures. Therefore, to fully depressurize and cool the gas storage cavern 1, the depressurization and temperature control cavern 2 is preferably arranged parallel to the middle of the gas storage cavern 1, and the length of the depressurization and temperature control cavern 2 is not less than 1 / 3 of the length of the gas storage cavern 1. Alternatively, multiple depressurization and temperature control caverns 2 can be used, arranged at intervals along the length of the gas storage cavern 1, to facilitate the dissipation of localized high temperature and high pressure within the gas storage cavern 1. To ensure the structural strength of the gas storage cavern 1, the thickness of the rock wall 3 between the gas storage cavern 1 and the depressurization and temperature control cavern 2 is preferably not less than 20 mm.

[0022] During actual construction, taking into account factors such as cost, ease of construction, and heat transfer and ventilation performance, the diameters of the first heat transfer pipe 41 and the second heat transfer pipe 42 can be selected as 50-70mm, and the arrangement spacing between adjacent heat transfer pipe groups 4 is 3-5m. In addition, in order to improve heat transfer efficiency, both the first heat transfer pipe 41 and the second heat transfer pipe 42 are copper pipes.

[0023] In order to enable the first heat transfer pipe 41 and the second heat transfer pipe 42 to come into contact with the high-temperature gas in the gas storage chamber 1 and the spray water of the spray device 5 respectively, the length of the first heat transfer pipe 41 and the second heat transfer pipe 42 extending into the gas storage chamber 1 and the depressurization and temperature control chamber 2 respectively is not less than 2m.

[0024] Since creating a through hole 31 in the rock wall 3 might affect the sealing performance of the gas storage chamber 1, the rear end of the first heat transfer pipe 41 can be extended to 2 / 3-3 / 4 of the distance from the front to the rear of the through hole 31. Sealing material can be filled between the outer wall of the first heat transfer pipe 41 and the inner wall of the through hole 31 for fixation. This increases the contact area between the first heat transfer pipe 41 and the through hole 31, ensuring sealing performance, and also reduces the length of the second heat transfer pipe 42, facilitating movement. Furthermore, a steel plate sealing cover 44 can be welded between the front side wall of the first heat transfer pipe 41 and the inner wall of the gas storage chamber 1 to shield the through hole 31, ensuring that the sealing effect of the gas storage chamber 1 is not affected.

[0025] For the drive device 6, a hydraulic or electric telescopic rod can be used. Its fixed end is fixed to the inner wall of the pressure relief and temperature control chamber 2, and its telescopic end is fixedly connected to the second heat transfer pipe 42. Since there are many pipes, installing an independent drive device 6 for each pipe would lead to high costs and increased control complexity. Therefore, all the second heat transfer pipes 42 can be divided into multiple groups. The pipes in each group are fixed together by a connector, and then the telescopic end of a drive device 6 is fixedly connected to the connector. This reduces the number of drive devices 6, lowers costs, and improves control convenience.

[0026] To achieve automated control of depressurization and cooling in the gas storage chamber 1, this invention also includes a control system 7. Multiple temperature detectors 8 and pressure detectors 9 are evenly distributed within the gas storage chamber 1. The valves 43, drive devices 6, spray devices 5, temperature detectors 8, and pressure detectors 9 are all electrically connected to the control system 7. The control system 7 of this invention uses existing hardware and software, constructing hardware execution logic based on conventional industrial control principles, without involving substantial modifications to software program algorithms, control models, or electronic circuit principles. Its control process is as follows: when one or more temperature detectors 8 or pressure detectors 9 detect localized high temperature or high pressure, the control system 7 contacts the nearby second heat transfer pipe 42 with the first heat transfer pipe 41 and activates the corresponding spray device 5, or opens the valve 43 on the nearby first heat transfer pipe 41 to drain the localized high temperature or high pressure until the temperature detectors 8 and pressure detectors 9 return to normal values, at which point the corresponding operation is closed. The valve 43 can be a pressure valve with a specific pressure. When the pressure in the gas storage chamber 1 exceeds the set threshold, the valve 43 will open automatically without the need for control by the control system 7, thus achieving automatic adjustment of the pressure in the gas storage chamber 1.

Claims

1. An underground cavern temperature and pressure control system, including a gas storage cavern (1), characterized in that: Next to the gas storage cavern (1) is a pressure relief and temperature control cavern (2) connected to the outside atmosphere. Multiple through holes (31) are connected to the rock wall (3) between the two caverns. A heat transfer pipe assembly (4) is inserted into each through hole (31). The heat transfer pipe assembly (4) includes a first heat transfer pipe (41) near the gas storage cavern (1) and a second heat transfer pipe (42) near the pressure relief and temperature control cavern (2). The first heat transfer pipe (41) is fixed inside the through hole (31), and its outer wall is connected to the outside atmosphere. The inner wall of the through hole (31) is sealed, and the front end extends into the gas storage chamber (1), and a valve (43) is provided at the front end. The second heat transfer pipe (42) is slidably installed in the through hole (31), and its rear end extends into the depressurization and temperature control chamber (2). The depressurization and temperature control chamber (2) is equipped with a spray device (5) and a driving device (6). The driving device (6) can drive the second heat transfer pipe (42) to move back and forth along the through hole (31) to achieve docking and disconnection with the first heat transfer pipe (41).

2. The underground cavern temperature and pressure control system as described in claim 1, characterized in that: The pressure relief and temperature control chamber (2) is arranged in parallel in the middle of the gas storage chamber (1), and the thickness of the rock wall (3) between them is not less than 20 mm. The length of the pressure relief and temperature control chamber (2) is not less than 1 / 3 of the length of the gas storage chamber (1).

3. The underground cavern temperature and pressure control system as described in claim 1, characterized in that: The diameter of the first heat transfer pipe (41) and the second heat transfer pipe (42) is 50-70mm, and the arrangement spacing of adjacent heat transfer pipe groups (4) is 3-5m.

4. The underground cavern temperature and pressure control system as described in claim 1, characterized in that: The first heat transfer pipe (41) and the second heat transfer pipe (42) extend into the gas storage chamber (1) and the depressurization and temperature control chamber (2) respectively for a length of not less than 2m.

5. The underground cavern temperature and pressure control system as described in claim 1, characterized in that: The rear end of the first heat transfer pipe (41) extends to a position of 2 / 3-3 / 4 of the front-to-back of the through hole (31), and a sealing cover (44) is provided between the front side wall of the first heat transfer pipe (41) and the inner wall of the gas storage chamber (1).

6. The underground cavern temperature and air pressure control system as described in claim 1, characterized in that: Both the first heat transfer pipe (41) and the second heat transfer pipe (42) are copper pipes.

7. The underground cavern temperature and air pressure control system as described in claim 1, characterized in that: The driving device (6) is a hydraulic or electric telescopic rod, with its fixed end fixed to the inner wall of the pressure relief and temperature control chamber (2) and its telescopic end fixedly connected to the second heat transfer pipe (42).

8. The underground cavern temperature and pressure control system as described in claim 7, characterized in that: All the second heat transfer pipes (42) are divided into multiple groups, and the pipes in each group are fixed together by connectors. The telescopic end of the drive device (6) is fixedly connected to the connectors.

9. The underground cavern temperature and pressure control system as described in any one of claims 1-8, characterized in that: It also includes a control system (7), and the gas storage chamber (1) is equipped with multiple temperature detectors (8) and air pressure detectors (9) evenly distributed. The valve (43), drive device (6), spray device (5), temperature detector (8) and air pressure detector (9) are all electrically connected to the control system (7).

10. The underground cavern temperature and pressure control system as described in claim 9, characterized in that: The valve (43) is a pressure valve. When the pressure in the gas storage chamber (1) exceeds the set threshold, the valve (43) will open automatically.

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