Underground chamber with breathing gas storage film and working method of underground chamber

Abstract

The invention provides an underground chamber with a breathing gas storage membrane, comprising: an embedded part comprising a main body and a cover body, a chamber with an open upper end is formed in the main body and forms a working cavity, and the cover body is arranged at the open upper end of the main body and enables the working cavity to form a sealing cavity; the gas storage film is arranged in the working cavity, a cavity is formed in the gas storage film, a gas storage cavity is formed in the gas storage film, and a compression cavity is formed between the inner wall of the working cavity and the outer wall of the gas storage film; the first pipe body assembly communicates with the gas storage cavity and is used for inputting or outputting medium gas in the gas storage cavity; and the second pipe body assembly communicates with the compression cavity and is used for inputting or outputting air in the compression cavity and enabling the air storage cavity to be compressed or expanded. The underground chamber with the breathing gas storage film is compact in structure, low in construction difficulty, good in sealing performance, capable of achieving stable output of medium gas, small in occupied area, low in manufacturing cost, good in using effect and wide in application range.

Description

Technical Field

[0001] The invention relates to a gas storage device, in particular to an underground chamber with a breathing gas storage membrane and a working method thereof. Background Art

[0002] Carbon dioxide energy storage (CES) technology is a new type of physical energy storage technology based on compressed air energy storage (CAES) and Brayton power generation cycle. The energy storage time can exceed 16 hours, and the energy release power can reach GW level. It has the advantages of high energy storage density, long operating life, and compact system equipment. It is suitable for large-scale long-term energy storage and has good development and application prospects. In the existing technical application, during the low electricity price period, the normal pressure gaseous carbon dioxide is converted into high pressure liquid carbon dioxide through a multi-stage compressor, and the electrical energy is converted into the form of carbon dioxide internal energy for storage; during the peak electricity consumption period, the high pressure liquid carbon dioxide is expanded into normal pressure gaseous carbon dioxide through a multi-stage expander to generate electricity, and finally realize the storage and release of electrical energy. In current technology, there are three main storage methods for compressed air energy storage and carbon dioxide energy storage: 1. Underground cave gas storage: Use underground natural caves, such as salt caves, depleted oil and gas wells or newly built gas storage wells, as places to store high-pressure carbon dioxide, but suitable natural caves are not everywhere, and there are certain restrictions on site selection; the impact of alternating stress on the cave wall during filling and discharging may cause collapse over time. 2. Artificial chamber gas storage: It is composed of concrete lining and sealing layer combined with surrounding rock, but this solution is only applicable to areas with many hard rock types and a wide distribution of the bottom layer, and the site selection of facilities is more demanding; and the supporting facilities for carbon dioxide energy storage must be built near the artificial chamber, so when selecting the site for the artificial chamber, it is necessary to consider whether there is enough flat ground nearby to build a factory or whether there are land leveling conditions, which to a certain extent increases the difficulty of site selection for artificial chambers. 3. High-pressure metal tank gas storage: Build large high-pressure metal containers and pass high-pressure carbon dioxide into them for storage. This solution has no requirements for the construction location and only requires the provision of a site. However, the construction cost of high-pressure containers is too high, and usually a metal container with a thickness of 50-80mm is required. Summary of the invention

[0003] Technical issues to be solved

[0004] The technical problem to be solved by the present invention is to provide an underground chamber with a breathing gas storage membrane which is based on mechanics, has high structural strength, good sealing performance, and can output gas pressure stably.

[0005] Technical solutions to the problem

[0006] The present invention provides an underground chamber with a breathing gas storage membrane, which comprises:

[0007] The embedded part is buried underground and includes a main body 1 and a cover 3. The main body 1 is formed with a chamber with an open upper end to form a working chamber. The cover 3 is arranged at the open upper end of the main body 1 and makes the working chamber form a sealed chamber.

[0008] The gas storage membrane 2 is arranged in the working chamber, the gas storage membrane 2 is provided with a chamber to form a gas storage chamber 20, and a compression chamber 10 is formed between the inner wall of the working chamber and the outer wall of the gas storage membrane 2;

[0009] A first tube assembly 5 is communicated with the gas storage chamber 20 and is used for inputting or outputting the medium gas in the gas storage chamber 20;

[0010] The second tube assembly 6 is communicated with the compression chamber 10 and is used for inputting or outputting the air in the compression chamber 10 and compressing or expanding the air storage chamber 20 .

[0011] Furthermore, the main body 1 is a truncated cone structure with a small upper end and a large lower end.

[0012] Furthermore, the upper open end of the main body 1 extends upward to form a neck 13 , the top surface of the neck 13 serves as a lower support surface 13 a and is used to support the cover body 3 , and a sealing ring is provided between the contact surface of the lower support surface 13 a and the cover body 3 .

[0013] Furthermore, the lower end of the second tube assembly 6 is located inside the neck.

[0014] Furthermore, the cover body 3 is sealed by its own gravity and the soil pressure on its upper end and can withstand high pressure.

[0015] Furthermore, the angle α between the side wall 12 of the main body 1 and the bottom surface 11 thereof is greater than or equal to 50° and less than or equal to 65°.

[0016] Furthermore, the angle α between the side wall 12 of the main body 1 and the bottom surface 11 thereof is greater than or equal to 57° and less than or equal to 58°.

[0017] Furthermore, the ratio of the diameter of the neck of the main body 1 to the diameter of its bottom surface is greater than or equal to 1 / 5 and less than 1 / 3.

[0018] Furthermore, a rounded corner is provided between the side wall and the bottom surface of the main body 1 .

[0019] Furthermore, the cover body 3 is an inverted truncated cone structure with a larger upper end and a smaller lower end.

[0020] Furthermore, the cover body 3 includes a parallel lower bottom surface 3a and an upper bottom surface 3b, and the area of ​​the upper bottom surface 3b is larger than that of the lower bottom surface 3a. The lower bottom surface 3a is used as a sealing surface to fit the open end surface of the main body 1 and achieve the sealing of the working chamber, and the upper bottom surface 3b is used as a supporting surface to compress soil or rock and generate downward pressure on the cover body 3.

[0021] Furthermore, the upper bottom surface 3b and the lower bottom surface 3a are coaxially arranged circular surfaces and are connected by an inclined surface 3c.

[0022] Furthermore, the angle β between the inclined surface 3c and the upper bottom surface 3b is greater than or equal to 10° and less than or equal to 20°.

[0023] Furthermore, the angle β between the inclined surface 3c and the upper bottom surface 3b is greater than or equal to 16° and less than or equal to 17°.

[0024] Furthermore, a diameter ratio of the upper bottom surface 3b to the lower bottom surface 3a is greater than or equal to 3:1 and less than or equal to 5:1.

[0025] Furthermore, the main body 1 and the cover 3 are both made of reinforced concrete.

[0026] Furthermore, the diameter of the lower bottom surface 3 a is the same as the diameter of the neck of the main body 1 .

[0027] Furthermore, a manhole passage 7 is provided on the cover body 3 , and the manhole passage 7 extends upward to the ground and is used for maintenance. A sealing door is provided on the manhole passage 7 .

[0028] Furthermore, the sealing door is arranged at the lower end of the manhole passage 7 and opens inwardly.

[0029] Furthermore, the lower end of the manhole passage 7 is located inside the neck of the main body.

[0030] Furthermore, the first tube body assembly 5 includes a first air inlet pipe 51 for air intake into the air storage chamber and a first air outlet pipe 52 for air exhaust from the air storage chamber, the first air inlet pipe 51 is provided with a first turbine generator 511, the first air outlet pipe 52 is provided with a first compressor 521, and a liquid storage tank 53 for storing a medium is provided between the first air inlet pipe 51 and the first air outlet pipe 52.

[0031] Furthermore, the second tube body assembly 6 includes a second air inlet pipe 61 for air intake into the compression chamber and a second air outlet pipe 62 for air exhaust from the compression chamber. The second air inlet pipe 61 is provided with a second compressor 611 , and the second air outlet pipe 62 is provided with a second turbine generator 621 .

[0032] At the same time, the present invention also provides a working method of an underground chamber with a breathing gas storage membrane, which comprises the following steps:

[0033] S1, energy storage stage: when the electricity price is low at night, the gaseous carbon dioxide in the gas storage chamber is compressed by the first compressor and stored in the liquid storage tank; the carbon dioxide in the gas storage chamber gradually decreases, and the normal pressure air in the atmosphere is compressed by the second compressor to form compressed air and stored in the compression chamber, thereby maintaining the pressure in the gas storage chamber or the working chamber;

[0034] S2, energy release stage: during the day when electricity prices are high, the liquid carbon dioxide in the storage tank is expanded through the first turbine expander generator to generate electricity, and the expanded gaseous carbon dioxide enters the underground air storage chamber. The carbon dioxide in the air storage chamber gradually increases, and at the same time, the high-pressure air in the compression chamber is discharged to maintain the pressure in the air storage chamber or the working chamber. The discharged compressed air generates electricity through the second turbine expander generator and returns to the atmosphere.

[0035] Furthermore, in step S1, the pressure of the compressed air filled into the compression chamber is the same as the pressure of the carbon dioxide discharged from the air storage chamber; in step S2, the pressure of the carbon dioxide filled into the air storage chamber is the same as the pressure of the compressed air discharged from the compression chamber.

[0036] Beneficial Effects

[0037] The underground chamber with a breathable gas storage membrane of the present invention aims at the problems existing in the existing gas storage, redesigns and optimizes the structure of the underground chamber based on mechanics, so that it is not restricted by regions and environments, can be dug downward on any flat ground, and effectively improves the pressure-bearing capacity by using the pressure-bearing principle, so as to realize the universalization of artificial chambers at a lower cost; the cone is used as the main shape of the underground chamber, and the gravity of the underground rock formation itself is effectively used, so that the pressure of the high-pressure gas in the chamber acts on the underground rock formation itself over a large area, thereby reducing the top outlet pressure; a trapezoidal steel-concrete cover body with a larger top and a smaller bottom is used, which effectively increases the weight of the cover body itself and ensures its strength, while reducing the sealing size, and adopts a sealing ring as one of the sealing methods to reduce the difficulty of sealing; the top of the steel-concrete cover is filled with a large amount of rock formation, which increases Increase the weight to achieve low difficulty and high quality sealing; built-in breathing gas storage membrane, the gas membrane is mainly used to isolate air and carbon dioxide, and by controlling the air pressure in the chamber to shrink or expand the gas membrane, finally obtain a stable carbon dioxide output pressure; the release process of the air in the tank is also connected to the generator, and the internal energy is converted into electrical energy, so as to achieve the purpose of energy saving and emission reduction; it occupies a small area, most of the buildings of the gas storage facilities constructed by this scheme are underground, and only the positions of the inlet and outlet pipes and maintenance pipes need to be left on the ground, and the corresponding ground can still be used to place other equipment, reducing the cost of land use; the underground chamber with a breathing gas storage membrane of the present invention has a compact structure, low construction difficulty, good sealing performance, can achieve stable output of medium gas, and occupies a small area, low manufacturing cost, good use effect and wide application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic structural diagram of an underground chamber with a breathing gas storage membrane according to the present invention;

[0039] Figure 2 It is a structural schematic diagram of the main body of the underground chamber with a breathing gas storage membrane of the present invention;

[0040] Figure 3 It is a structural schematic diagram of the cover of the underground chamber with a breathing gas storage membrane of the present invention;

[0041] Figure 4 This is a pipeline connection diagram of the underground chamber with a breathing gas storage membrane of the present invention;

[0042] Figure 5 It is a force analysis diagram of the underground chamber with a breathing gas storage membrane of the present invention. DETAILED DESCRIPTION

[0043] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0044] See also Figure 1-Figure 5 The present invention provides an underground chamber with a breathing gas storage membrane, which includes embedded parts, a gas storage membrane 2, a first pipe body assembly 5 and a second pipe body assembly 6.

[0045] The embedded part is buried underground and is made of reinforced concrete as a whole. It is an underground project. The embedded part includes a main body 1 and a cover body 3. A chamber is formed in the main body 1. The upper end of the chamber is open (open) to form a working chamber. The cover body 3 is arranged (covered) on the upper open end of the main body 1, which makes the working chamber form a sealed chamber.

[0046] In the present application, the main body 1 is a truncated cone-shaped structure with a small upper end and a large lower end, that is, a structure similar to a cone, and its side wall is an inclined surface. Therefore, the internal working cavity also forms a truncated cone (cone) structure with a small upper end and a large lower end, which can reduce the pressure at the upper open end, and can reduce the difficulty of sealing construction, and achieve better and more stable sealing; in this embodiment, the angle α between the side wall 12 of the main body 1 and its bottom surface 11 is greater than or equal to 50° and less than or equal to 65°, and preferably, the angle α is greater than or equal to 57° and less than or equal to 58°; at the same time, the upper open end of the main body 1 extends vertically upward The neck 13 is cylindrical and has a neck opening formed inside thereof, which serves as the open end of the main body (working chamber). The top surface of the neck 13 is a plane, which serves as a lower support surface 13a for supporting the cover body 3. At the same time, a sealing ring is provided between the lower support surface 13a and the contact surface of the cover body 3. The cover body 3 is fitted on the top surface of the neck 13, and the sealing is achieved by the self-gravity of the cover body 3 and the pressure of the soil or rock on the upper end of the cover body 3, and can withstand the high pressure in the working chamber. Therefore, an annular groove is provided on the top surface of the neck 13, and a sealing ring is provided in the annular groove. The sealing ring has a thickness greater than the depth of the annular groove, and its upper end protrudes outside the annular groove. When the cover body is closed, it is deformed under pressure and fits against the lower surface of the cover body 3 to form a seal; in order to further improve the sealing reliability, the above-mentioned annular grooves can be multiple and coaxially arranged, that is, multiple coaxial sealing rings are arranged to achieve a multi-channel sealing structure, which greatly improves the sealing reliability; in the present application, the bottom surface of the main body 1 is a plane, and the ratio of the diameter of the neck of the main body 1 to the diameter of the bottom surface of the main body 1 is greater than or equal to 1 / 5 and less than 1 / 3, preferably 1 / 4, that is, the diameter of the main body 1 The diameter of the bottom surface is 4 times the diameter of the neck 13. Under this ratio, combined with the slope of the side wall of the main body 1, the construction difficulty can be reduced, the overall structural strength and pressure-bearing capacity can be improved, and at the same time, the aperture can be minimized within the pressure-bearing capacity to facilitate the sealing of the cover 3 and reduce the pressure on the open end of the main body during operation, thereby greatly reducing the difficulty of sealing construction and improving the sealing reliability and stability. In order to facilitate construction and improve structural strength, a rounded corner is provided between the side wall and the bottom surface of the main body 1, that is, a circular arc transition connection is used to avoid sharp angles and improve compressive strength.

[0047] At the same time, the cover body 3 is an inverted truncated cone structure with a larger upper end and a smaller lower end. Specifically, the cover body 3 has a parallel lower bottom surface 3a and an upper bottom surface 3b, and the area of ​​the upper bottom surface 3b is larger than the area of ​​the lower bottom surface 3a. The lower bottom surface 3a is used as a sealing surface to fit the open end (neck) end surface of the main body 1 to achieve the sealing of the working chamber. The upper bottom surface 3b is used as a supporting surface to pile soil or rocks. The soil or rocks exert downward pressure on the cover body 3, and the gravity of the cover body 3 itself compresses the lower bottom surface 3a of the cover body 3. The top surface of the upper open end (neck) of the main body 1 is sealed; in this embodiment, the upper bottom surface 3b and the lower bottom surface 3a are coaxial circular surfaces, and the diameter of the upper bottom surface 3b is greater than the diameter of the lower bottom surface 3a, and the diameter ratio of the two is greater than or equal to 3:1 and less than or equal to 5:1, preferably, 4. At the same time, the upper bottom surface 3b and the lower bottom surface 3a are connected by an inclined surface 3c to form a truncated cone structure with a larger upper end and a smaller lower end. In order to improve the structural strength and increase the weight to a certain extent, the upper bottom surface extends upward for a short distance The upper and lower bottom surfaces are separated to form a cylindrical structure, which avoids the formation of acute angles at the edges of the upper and lower bottom surfaces, improves the structural strength and pressure-bearing capacity, and at the same time, increases a certain thickness and increases its own weight; in this embodiment, the angle β between the inclined surface 3c and the upper bottom surface 3b is greater than or equal to 10° and less than or equal to 20°. Preferably, the angle β is greater than or equal to 16° and less than or equal to 17°. In combination with the diameter ratio of the upper and lower bottom surfaces, while ensuring the structural strength, the upper end pressure area can be maximized and transferred to the lower bottom surface to form a pressing surface for the neck, thereby increasing the pressing force, improving the pressure-bearing capacity of the working chamber, and at the same time, improving the sealing performance; in this application, the diameter of the lower bottom surface 3a is the same as the diameter (outer diameter) of the neck of the main body 1. Therefore, the lower bottom surface 3a can transfer all the pressure of the cover body 3 and the upper end of the cover body 3 to the neck, thereby achieving compression and sealing, while bearing the pressure inside the working chamber, and realizing the maximum utilization of the pressure; at the same time, the above-mentioned parameterized setting is adopted to make the area of ​​the upper bottom surface of the cover body 3 equal to or slightly larger than the bottom surface of the main body 1.

[0048] The air storage membrane 2 is arranged in the working chamber and can produce elastic deformation. A chamber is provided in the air storage membrane 2 to form an air storage chamber 20 for storing medium gas. At the same time, a compression chamber 10 is formed between the inner wall of the working chamber and the outer wall of the air storage membrane 2 for introducing compressed air and controlling the pressure in the air storage chamber.

[0049] The first tube body assembly 5 is in communication with the air storage chamber 20, and is used for inputting or outputting the medium gas in the air storage chamber 20. Specifically, the first tube body assembly 5 includes a first air inlet pipe 51 and a first air outlet pipe 52. The first air inlet pipe 51 is used for air inlet to the air storage chamber, and the first air outlet pipe 52 is used for air outlet to the air storage chamber. One end of each of the first air inlet pipe 51 is located in the air storage chamber 20, and the other end passes through the cover body and extends to the ground. At the same time, a first turbine generator 511 is provided on the first air inlet pipe 51, and a first compressor 521 is provided on the first air outlet pipe 52. The first compressor 521 and the first turbine generator 511 are both located on the ground. A liquid storage tank 53 is provided between the first air outlet pipe 52 for storing a medium, that is, the inlet end of the liquid storage tank 53 is connected to the first air outlet pipe 52, and a first compressor is provided on the first air outlet pipe 52 for compressing the low-pressure medium in the air storage cavity into a high-pressure medium and then storing it in the liquid storage tank. The outlet end of the liquid storage tank 53 is connected to the first air inlet pipe 51, and a first turbine generator is provided on the first air inlet pipe 51. The high-pressure medium output by the liquid storage tank is expanded and generated by the first turbine expansion generator to form a gaseous low-pressure medium, and is transferred to the air storage cavity 20 for storage to form a cycle. In this application, the medium is carbon dioxide;

[0050] The second tube body assembly 6 is connected to the compression chamber 10, and is used for the input or output of air in the compression chamber 10, thereby compressing or expanding the air storage chamber 20 to generate different air storage pressures. Specifically, the second tube body assembly 6 includes a second air inlet pipe 61 and a second air outlet pipe 62, wherein the second air inlet pipe 61 is used for air intake into the compression chamber. Therefore, a second compressor 611 is provided on the second air inlet pipe 61, which is used to compress the air in the environment and transport it into the compression chamber. The second air outlet pipe 62 is used for exhausting the compression chamber. A second turbine generator 621 is provided on the second air outlet pipe 62, which can expand the exhausted compressed gas to generate electricity, thereby improving energy utilization and avoiding or reducing losses. In the present application, the lower end of the second tube body assembly 6 is located inside the neck to avoid contact with the air storage membrane, thereby improving stability in use and extending service life.

[0051] At the same time, a manhole channel 7 is provided on the cover body 3, and the manhole channel 7 extends upward to the ground for maintenance. A sealing door is provided on the manhole channel 7. In the present embodiment, the sealing door is arranged at the lower end of the manhole channel 7 and opens inwardly, which can increase the sealing reliability of the sealing door, that is, the sealing door is pressed against the bottom surface of the cover body by the internal pressure. The greater the pressure, the better the sealing performance. While improving the sealing performance, the reliability of use is greatly improved; and the lower end of the manhole channel 7 is also located in the neck of the main body to avoid contact with the gas storage membrane; the artificial channel is a vertically arranged steel pipe structure with an anti-rust layer coated on the surface. It can adopt a multi-section structure and be installed in the form of assembly and splicing, which is convenient for production, transportation and assembly.

[0052] The following is a brief acceptance analysis of the embedded parts (main body and cover) in this application:

[0053] See also Figure 5 The lower bottom surface 3a of the cover body 3 fits with the top surface of the neck of the main body 1, and the neck of the main body 1 is pressed tightly by the weight of the cover body 3 itself. At the same time, the top of the cover body 3 is covered with soil or rocks, and the gravity of the soil or rocks forms pressure on the cover body, and the pressure is transmitted to the neck of the main body through the lower bottom surface of the cover body; at the same time, since the area of ​​the upper bottom surface 3b of the cover body is larger than the area of ​​the lower bottom surface 3a, the contact area with the soil or rock can be increased, that is, the pressure of the upper soil and rock on the cover body is increased, and more soil or rock can be carried, which indirectly increases the pressure of the lower bottom surface of the cover body on the neck of the main body, improves the overall sealing, and at the same time, increases the pressure bearing capacity of the working chamber. At the same time, the side wall of the cover body is an inclined surface, which can generate a certain inclined pressure on the soil at the lower end of the inclined surface. Since the main body is a truncated cone structure with a small upper end and a large lower end, this part of the soil is just located on the outside of the side wall of the main body. The force generated by the inclined surface of the cover body can be transmitted to the side wall of the main body 1 through the soil or rock, thereby increasing the internal pressure-bearing capacity; inside the main body 1, the pressure generated by the working chamber (including the air storage chamber and the compression chamber) will generate an outward thrust on the side wall of the working chamber and the lower bottom surface of the cover body, and there is an inward pressure on the outside of the main body. Therefore, through this structural setting, the pressure-bearing capacity of the working chamber in the main body can be greatly improved, which is suitable for different air storage needs and has a wide range of uses.

[0054] At the same time, the present invention also provides a working method of an underground chamber with a breathing gas storage membrane, which comprises the following steps:

[0055] S1, energy storage stage: at night when the electricity price is low, the 1.5Mpa gaseous carbon dioxide in the gas storage chamber is compressed through the first outlet pipe and the first compressor, compressed to 7.5Mpa and stored in the liquid storage tank; at this time, the carbon dioxide in the gas storage chamber gradually decreases, and the normal pressure air in the atmosphere is compressed through the second compressor to form 1.5Mpa compressed air, which is stored in the compression chamber through the second inlet pipe, thereby maintaining the pressure in the gas storage chamber or the working chamber;

[0056] S2, energy release stage: during the day when electricity prices are high, the 7.5Mpa liquid carbon dioxide in the storage tank is expanded to generate electricity through the first turbine expander generator, and the expanded 1.5Mpa gaseous carbon dioxide enters the underground air storage cavity through the first air inlet pipe. At this time, the carbon dioxide in the air storage cavity gradually increases. At the same time, the high-pressure air in the compression cavity is discharged through the second air outlet pipe, thereby maintaining the pressure in the air storage cavity or the working cavity. The discharged compressed air generates electricity through the second turbine expander generator and returns to the atmosphere. The internal energy is converted into electrical energy, thereby achieving the purpose of energy saving and emission reduction.

[0057] In order to maintain a stable pressure and form a stable pressure input or output, in this embodiment, the pressure of the compressed air filled into the compression chamber is the same as the pressure of the carbon dioxide discharged from the air storage chamber; the pressure of the carbon dioxide filled into the air storage chamber is the same as the pressure of the compressed air discharged from the compression chamber.

[0058] The underground chamber with a breathable gas storage membrane of the present invention aims at the problems existing in the existing gas storage, redesigns and optimizes the structure of the underground chamber based on mechanics, so that it is not restricted by regions and environments, can be dug downward on any flat ground, and effectively improves the pressure-bearing capacity by using the pressure-bearing principle, so as to realize the universalization of artificial chambers at a lower cost; the cone is used as the main shape of the underground chamber, and the gravity of the underground rock formation itself is effectively used, so that the pressure of the high-pressure gas in the chamber acts on the underground rock formation itself over a large area, thereby reducing the top outlet pressure; a trapezoidal steel-concrete cover body with a larger top and a smaller bottom is used, which effectively increases the weight of the cover body itself and ensures its strength, while reducing the sealing size, and adopts a sealing ring as one of the sealing methods to reduce the difficulty of sealing; the top of the steel-concrete cover is filled with a large amount of rock formation, which increases Increase the weight to achieve low difficulty and high quality sealing; built-in breathing gas storage membrane, the gas membrane is mainly used to isolate air and carbon dioxide, and by controlling the air pressure in the chamber to shrink or expand the gas membrane, finally obtain a stable carbon dioxide output pressure; the release process of the air in the tank is also connected to the generator, and the internal energy is converted into electrical energy, so as to achieve the purpose of energy saving and emission reduction; it occupies a small area, most of the buildings of the gas storage facilities constructed by this scheme are underground, and only the positions of the inlet and outlet pipes and maintenance pipes need to be left on the ground, and the corresponding ground can still be used to place other equipment, reducing the cost of land use; the underground chamber with a breathing gas storage membrane of the present invention has a compact structure, low construction difficulty, good sealing performance, can achieve stable output of medium gas, and occupies a small area, low manufacturing cost, good use effect and wide application range.

[0059] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An underground chamber with a breathing gas storage membrane, characterized in that: include: The embedded part is buried underground and includes a main body 1 and a cover 3. The main body 1 is formed with a chamber with an open upper end to form a working chamber. The cover 3 is arranged at the open upper end of the main body 1 and makes the working chamber form a sealed chamber. The gas storage membrane 2 is arranged in the working chamber, the gas storage membrane 2 is provided with a chamber to form a gas storage chamber 20, and a compression chamber 10 is formed between the inner wall of the working chamber and the outer wall of the gas storage membrane 2; A first tube assembly 5 is communicated with the gas storage chamber 20 and is used for inputting or outputting the medium gas in the gas storage chamber 20; The second tube assembly 6 is communicated with the compression chamber 10 and is used for inputting or outputting the air in the compression chamber 10 and compressing or expanding the air storage chamber 20 .

2. The underground chamber with a breathing gas storage membrane as claimed in claim 1, characterized in that: The main body 1 is a truncated cone structure with a small upper end and a large lower end.

3. The underground chamber with a breathing gas storage membrane as claimed in claim 1, characterized in that: The upper open end of the main body 1 extends upward to form a neck 13 , the top surface of the neck 13 serves as a lower support surface 13 a and is used to support the cover 3 , and a sealing ring is provided between the lower support surface 13 a and the contact surface of the cover 3 .

4. The underground chamber with a breathing gas storage membrane as claimed in claim 1, characterized in that: The angle α between the side wall 12 of the main body 1 and the bottom surface 11 thereof is greater than or equal to 50° and less than or equal to 65°.

5. The underground chamber with a breathing gas storage membrane as claimed in claim 1, characterized in that: The cover body 3 is an inverted truncated cone structure with a larger upper end and a smaller lower end.

6. The underground chamber with a breathing gas storage membrane as claimed in claim 1, characterized in that: The cover body 3 includes a parallel lower bottom surface 3a and an upper bottom surface 3b, and the area of ​​the upper bottom surface 3b is larger than that of the lower bottom surface 3a. The lower bottom surface 3a is used as a sealing surface to fit the open end surface of the main body 1 and achieve the sealing of the working chamber, and the upper bottom surface 3b is used as a supporting surface to compress soil or rock and generate downward pressure on the cover body 3.

7. The underground chamber with a breathing gas storage membrane as claimed in claim 1, characterized in that: The diameter ratio of the upper bottom surface 3b to the lower bottom surface 3a is greater than or equal to 3:1 and less than or equal to 5:

1.

8. The underground chamber with a breathing gas storage membrane as claimed in claim 1, characterized in that: The first tube body assembly 5 includes a first air inlet pipe 51 for air intake into the air storage chamber and a first air outlet pipe 52 for air exhaust from the air storage chamber. The first air inlet pipe 51 is provided with a first turbine generator 511, the first air outlet pipe 52 is provided with a first compressor 521, and a liquid storage tank 53 for storing a medium is provided between the first air inlet pipe 51 and the first air outlet pipe 52.

9. The underground chamber with a breathing gas storage membrane as claimed in claim 1, characterized in that: The second tube body assembly 6 includes a second air inlet pipe 61 for air intake into the compression chamber and a second air outlet pipe 62 for air exhaust from the compression chamber. The second air inlet pipe 61 is provided with a second compressor 611 , and the second air outlet pipe 62 is provided with a second turbine generator 621 .

10. A working method of an underground chamber with a breathing gas storage membrane, characterized in that: The following steps are involved: S1, energy storage stage: when the electricity price is low at night, the gaseous carbon dioxide in the gas storage chamber is compressed by the first compressor and stored in the liquid storage tank; the carbon dioxide in the gas storage chamber gradually decreases, and the normal pressure air in the atmosphere is compressed by the second compressor to form compressed air and stored in the compression chamber, thereby maintaining the pressure in the gas storage chamber or the working chamber; S2, energy release stage: during the day when electricity prices are high, the liquid carbon dioxide in the storage tank is expanded through the first turbine expander generator to generate electricity, and the expanded gaseous carbon dioxide enters the underground air storage chamber. The carbon dioxide in the air storage chamber gradually increases, and at the same time, the high-pressure air in the compression chamber is discharged to maintain the pressure in the air storage chamber or the working chamber. The discharged compressed air generates electricity through the second turbine expander generator and returns to the atmosphere.

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