CN118242102A - Vertical shaft gas storage cave group and compressed air energy storage system - Google Patents
Vertical shaft gas storage cave group and compressed air energy storage system Download PDFInfo
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- CN118242102A CN118242102A CN202211667446.0A CN202211667446A CN118242102A CN 118242102 A CN118242102 A CN 118242102A CN 202211667446 A CN202211667446 A CN 202211667446A CN 118242102 A CN118242102 A CN 118242102A
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- 238000003860 storage Methods 0.000 title claims abstract description 185
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Abstract
The invention discloses a vertical shaft gas storage cave group and a compressed air energy storage system, and relates to the technical field of compressed air energy storage. The vertical shaft gas storage cave group comprises at least one group of vertical shaft gas storage cave which is cylindrical and extends downwards from the ground surface longitudinally; the vertical shaft gas storage cave comprises a gas storage chamber and a filling layer, wherein the gas storage chamber comprises an upper sealing head, a lower sealing head, a gas storage cavity, a gas inlet pipe and a gas outlet pipe. The compressed air energy storage system provided by the invention comprises the vertical shaft gas storage cave group. The vertical shaft gas storage cave group has the advantages that the construction period is short when in construction, and each vertical shaft gas storage cave can be independently constructed and can be constructed in stages; the number of the gas storage chambers of the operation shaft can be selected according to the requirements after the operation is built, and the gas storage volume can be adjusted.
Description
Technical Field
The invention relates to the technical field of compressed air energy storage, in particular to a vertical shaft gas storage cave group.
Background
Compressed air energy storage technology is a large-scale, long-time and large-capacity electric energy storage technology. When electricity is used in low-peak, the high-pressure air is released from the air storage system and is subjected to work generation through the expander to convert the air internal energy into electric energy to be released.
The compressed air energy storage system stores the high-pressure air through the air storage system, and the air storage pressure is usually about 10MPa, and belongs to a medium-high pressure range. The existing gas storage systems are divided into an overground gas storage system and an underground gas storage system, and the underground gas storage system is particularly suitable for an underground stratum area.
In the process of implementing the present invention, the inventor finds that at least the following problems exist in the prior art:
Since the air storage system of the compressed air energy storage system is power class dependent. The existing underground gas storage mostly utilizes a large-scale integrated cave, the existing gas storage system is a large-scale gas storage tank, the gas storage system needs to be built at one time, and the gas storage volume cannot be changed after the gas storage system is built, so that the adjustment flexibility of the existing compressed air energy storage system is low, and the gas storage capacity cannot be adjusted after the gas storage system is built. Since the air storage capacity and pressure of compressed air are directly related to the efficiency and the electricity storage capacity of the system, that is, if the air storage capacity can be increased, the electricity storage capacity of the compressed air energy storage system can be greatly increased, and the adjustability of the whole system can be greatly increased. Based on the above, it is needed to provide a gas storage system with adjustable gas storage volume, which can be constructed in stages.
Disclosure of Invention
The invention aims to provide a gas storage system which can be constructed in stages.
In order to achieve the purpose, on one hand, the vertical shaft gas storage cave group comprises at least one group of vertical shaft gas storage cave, wherein the vertical shaft gas storage cave is cylindrical and extends downwards from the ground surface longitudinally; the vertical shaft gas storage cave comprises a gas storage chamber and a filling layer, wherein the filling layer is arranged close to the ground surface, and the gas storage chamber is positioned at the lower end of the filling layer; the air storage chamber comprises an upper end socket, a lower end socket, an air storage cavity, an air inlet pipe and an air outlet pipe, wherein the upper end socket and the lower end socket are respectively connected with two ends of the air storage cavity, the upper end socket is positioned at one end close to the filling layer, and the lower end socket is positioned at one end far away from the filling layer; the air inlet pipe and the air outlet pipe are both connected with the upper sealing head.
Preferably, the depth of the air storage chamber is 80-160 m, and the diameter length of the cross section is 2-12 m; the depth of the filling layer is at least 20 meters; the distance between the central lines of the vertical shaft gas storage chambers is more than 50 meters.
Preferably, the shaft gas storage chambers are provided with eight groups or nine groups, and the center line distances between every two shaft gas storage chambers are the same.
Preferably, a first anchoring structure is arranged between the filling layer and the surrounding rock.
Preferably, the structure of the air storage cavity is as follows: the first steel lining layer is paved on the inner surface of the first concrete lining layer, and the outer surface of the first concrete lining layer is fixedly connected with surrounding rock.
Preferably, the steel lining layer comprises at least one section of circular steel pipe, and at least one section of pressure steel pipe is fixedly connected from bottom to top in sequence.
Preferably, the structure of the lower seal head is as follows: the second steel lining layer is paved on the inner surface of the second concrete lining layer, and the outer surface of the second concrete lining layer is fixedly connected with surrounding rock; the second steel lining layer is fixedly connected with the first steel lining layer.
Preferably, the structure of the upper end socket is as follows: a third steel lining layer and a third concrete lining layer are sequentially arranged from inside to outside, the third steel lining layer is paved on the inner surface of the third concrete lining layer, and the outer surface of the third concrete lining layer is fixedly connected with surrounding rock; the third steel lining layer is fixedly connected with the first steel lining layer.
Preferably, at least two sets of the shaft gas storage chambers are arranged at different depths in the underground.
In another aspect, a compressed air energy storage system includes any of the aforementioned shaft gas storage caverns.
The beneficial effect of this scheme:
In the prior art, a vertical shaft and a roadway are mostly arranged around the outside of an air storage chamber, so that equipment can enter the ground, a hole is dug underground from the vertical shaft or the roadway, the air storage chamber is paved in the hole, and the vertical shaft is buried after the air storage chamber is built. Therefore, in the prior art, the construction speed of the air storage chamber is difficult to be improved because the vertical shafts are buried after the construction is finished. According to the vertical shaft gas storage cave group, the gas storage chambers are designed to be a plurality of single wells and are arranged in the vertical shaft gas storage cave, the gas storage chambers can be assembled on the ground in advance, a vertical shaft for placing the gas storage chambers is dug from the ground during construction, the gas storage chambers assembled in advance are fixed after being placed in the vertical shaft, and finally a filling layer is buried above the gas storage chambers. Therefore, the vertical shaft gas storage cave group of the scheme only needs to dig a vertical shaft for placing the gas storage chambers during construction, a plurality of vertical shaft gas storage cave digs a plurality of wells, and after the gas storage chambers are assembled, only the filling layer is needed to be buried above the gas storage chambers, so that the whole vertical shaft is not needed to be buried. Therefore, the method does not need to additionally dig a vertical shaft and a roadway during construction of the gas storage cave group of the well, and can improve the construction speed. In addition, when the gas storage cave group of the well is constructed, each vertical shaft can be independently constructed, construction surfaces are not interfered with each other, and the construction speed can be further improved. Furthermore, the gas storage cave group of the well can be constructed in stages, a shaft gas storage cave can be built at the beginning, the compressed air energy storage system can be guaranteed to be put into operation, and a plurality of shaft gas storage cave can be built again to be used in the previous compressed air energy storage system if the gas storage capacity is required to be increased in the later stage.
Based on this, the compressed air energy storage system of this scheme has that construction speed is fast, can stage construction, gas storage volume adjustable advantage.
Drawings
FIG. 1 is a schematic view of a vertical shaft gas storage cavern group of the present invention;
FIG. 2 is a schematic view of another embodiment of the shaft air storage cavern group of the present invention;
FIG. 3 is a schematic view of a structure of the shaft air storage chamber of the present invention;
fig. 4 is a schematic view of the structure of the wall of the air storage chamber.
In the figure: 100-a vertical shaft gas storage cave; 110-a filling layer; 120-an air storage chamber; 121-upper end socket; 122-an air storage chamber; 123-lower end socket; 124-an air inlet pipe; 125-an air outlet pipe; 1221-a first steel backing layer; 1222-a first concrete lining; 200-a vertical shaft gas storage cave group; 300-surrounding rock.
Detailed Description
In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature. The center line of the column shape means a center axis in the height direction, and the cross section means a plane sectioned along a plane perpendicular to the center axis.
Embodiment one:
As shown in fig. 1-4, this embodiment improves a vertical shaft gas storage cave group 200, which is disposed underground. As shown in fig. 1 and 2, the shaft air storage cave group includes at least one set of shaft air storage cave 100. As shown in fig. 3, the shaft air storage chamber 100 has a cylindrical shape and extends longitudinally downward from the earth's surface, and has a shape similar to a subterranean well. The vertical shaft gas storage chamber 100 comprises a gas storage chamber 120 and a filling layer 110, wherein the filling layer 110 is arranged close to the ground surface, the gas storage chamber 120 is positioned at the lower end of the filling layer 110, and the gas storage chamber is used for storing medium-high pressure air. The filling layer is used for anchoring the air storage chamber on one hand and is used for arranging other pipelines such as an air inlet pipe and an air outlet pipe of the air storage chamber on the other hand. Because the gas inlet and the gas outlet of the vertical shaft gas storage cave are medium-pressure gas, the gas inlet and the gas outlet are not performed simultaneously in general, namely, the vertical shaft gas storage cave only enters the gas or only exits the gas in a certain period, and therefore, the gas inlet and the gas outlet pipeline can also be a pipeline.
The air storage chamber 120 comprises an upper sealing head 121, a lower sealing head 123, an air storage cavity 122, an air inlet pipe 124 and an air outlet pipe 125, wherein the upper sealing head 121 and the lower sealing head 123 are respectively connected to two ends of the air storage cavity 122, the upper sealing head 121 is located at one end close to the filling layer, and the lower sealing head 123 is located at one end far away from the filling layer.
Therefore, the well gas storage cave group of the scheme comprises at least one group of shaft gas storage cave, each shaft gas storage cave can be independently constructed and independently operated, the construction can be carried out according to the needs in stages, the number of the operated shaft gas storage cave can be adjusted or the number of the operated shaft gas storage cave can be increased after the construction, and the adjustability of the whole gas storage system is further improved.
Because the gas storage chamber is used for storing medium-high pressure gas, the shape and the size of the gas storage chamber are obtained through self bearing design, underground anti-lifting stable design and hole group stable design analysis, preferably, the depth of the gas storage chamber 120 is 80-160 meters, the diameter length of the cross section is 2-12 meters, the depth of the filling layer 110 is at least 20 meters, and the pressure bearing and stable operation of the vertical shaft gas storage chamber can be ensured. On the basis, in order to prevent the peripheral geological collapse, the center line distance between the vertical shaft gas storage chambers needs to be greater than 50 meters.
Preferably, as shown in fig. 1, the vertical shaft gas storage chambers are provided with eight or nine groups, the central line distances between every two vertical shaft gas storage chambers are the same, and the vertical shaft gas storage chambers are arranged in an array. For example, the shaft gas storage cave has eight groups, and two groups of each row are four rows altogether. Or the vertical shaft gas storage cave is provided with nine groups, and three groups of three rows are three rows altogether. The shaft gas storage tunnel group with eight shaft gas storage tunnels can be opened from one group to eight groups according to the requirement, and the minimum step length of each capacity adjustment is one group of shaft gas storage tunnels, namely, the adjustment capacity is eight gears. Similarly, the capacity adjustment capability of the vertical shaft gas storage cave group with nine vertical shaft gas storage cave sets is nine. The arrangement form not only ensures that the dynamic stability of the whole system in operation is better, but also ensures that the total gas storage volume and the adjustment step length can meet the requirements of most of the existing compressed air energy storage systems.
Preferably, a first anchoring structure is arranged between the filling layer of the vertical shaft gas storage cave and the surrounding rock. During construction, a vertical shaft gas storage cave is firstly excavated downwards from the ground surface, then a gas storage chamber assembled in advance is placed in the vertical shaft, and a first anchoring structure is arranged on a filling layer above the gas storage chamber and around the vertical shaft and used for fixing the whole vertical shaft gas storage cave. The first anchoring structure may be a rebar, anchor rod, or the like anchoring structure.
Preferably, as shown in fig. 4, the air storage chamber 122 has a structure as follows: the first steel lining layer 1221 and the first concrete lining 1222 are sequentially arranged from inside to outside, the first steel lining layer is paved on the inner surface of the first concrete lining, and the outer surface of the first concrete lining is fixedly connected with the surrounding rock 300.
The cross section of the air storage cavity 122 of this embodiment has a diameter of 2m to 12 m, and preferably, the thickness of the first steel lining layer is 50 mm to 70 mm, and the strength and the air storage volume of the air storage cavity are comprehensively considered.
Preferably, the first steel lining layer comprises at least one section of pressure steel pipe, and the at least one section of pressure steel pipe is fixedly connected from bottom to top in sequence.
Preferably, the first steel lining of the gas storage chamber and/or the arc-shaped steel plate of the upper head and/or the inner side of the second steel lining of the lower head are coated, for example coated with a corrosion-resistant material, using a laser cladding process. Laser cladding, also known as laser cladding or laser cladding, is a novel surface modification technique. The laser cladding has the characteristics of small dilution, compact structure, good combination of the coating and the matrix, suitability for cladding materials, large granularity and content variation, and the like. Because the air storage cavity can expand and contract in the inflation and deflation, the laser cladding process is adopted to carry out coating for a plurality of times, thereby avoiding the occurrence of cracking sites, prolonging the service life and reducing the maintenance times.
Preferably, the outer side of at least one section of pressure steel pipe close to the upper end socket is provided with a second anchoring structure. The air storage chamber of this embodiment sets up in the shaft, and the air storage chamber includes upper end enclosure, low head and air storage chamber, and the upper end enclosure is close to ground and arranges, and the low head is close to the geocenter and arranges. Because the rock-soil pressure near the earth center is larger, the lower seal head and the pressure steel pipe nearby the lower seal head can not be anchored in order to improve the construction speed. But the penstock near the upper head (i.e., near the packing) needs to be anchored, where a second anchoring structure is provided. And determining the number of the pressure steel pipes needing to be provided with the second anchoring structure according to the geotechnical geological conditions and the capacity and the landfill depth of the gas storage chamber.
Preferably, the first and second anchors each comprise an anchor rib with hooks, preferably the first anchor further comprises an anchor seat fixedly connected with the complete surrounding area inside the shaft.
Preferably, the structure of the lower seal head is: the second steel lining layer is paved on the inner surface of the second concrete lining layer, the outer surface of the second concrete lining layer is fixedly connected with surrounding rock, and the second steel lining layer is in sealing connection with the first steel lining layer.
Preferably, the structure of the upper seal head is: the third steel lining layer is paved on the inner surface of the third concrete lining layer, and the outer surface of the third concrete lining layer is fixedly connected with surrounding rock; and the third steel lining layer is fixedly connected with the first steel lining layer. The third steel lining layer of the upper seal head is fixedly connected with the first steel lining layer of the air storage cavity, and the second steel lining layer of the lower seal head is fixedly connected with the first steel lining layer of the air storage cavity.
The filling layer is located the upside of air receiver for fixed air receiver makes the air receiver keep apart with external relatively, and the intake pipe and the outlet duct of fixed air receiver can be from the upper end enclosure of air receiver to ground can be whole filling layer, also can be partly the filling layer (the degree of depth of filling layer is 20 meters at least), and the filling layer can also further set up blind well to ground this moment for place other spare parts and automatically controlled components and parts etc.. The material of the filling layer may include concrete, crushed rock, etc.
Preferably, the depths of the underground arrangement of the at least two sets of shaft gas storage caverns are different. Namely, the depths of the underground arrangement of different vertical shaft gas storage chambers are different. The positions of the vertical shaft gas storage tunnel can be reasonably arranged according to the underground rock types and the underground geological conditions, so that the vertical shaft gas storage tunnel group of the embodiment is more flexible in site selection during construction and wider in adaptive geological conditions.
Taking a vertical shaft gas storage cave group comprising eight groups of vertical shaft gas storage cave as an example, one construction method comprises the following steps:
Step 100: geological survey. After geological mapping is carried out on the site, drilling and sampling are carried out, and the test is returned to a laboratory test, wherein the detection content comprises rock mechanical property test, cyclic loading test, rock thermodynamic property test, rock and ore identification and water quality analysis.
Step 200: and digging a vertical shaft where the air storage chamber is located. Step 210: and assembling the gas storage cavity, and assembling an upper sealing head and a lower sealing head at two ends of the gas storage cavity. Step 220: the air storage chamber is placed in the shaft. Step 230: and pouring concrete around the lower seal head and the gas storage cavity. Step 230: and assembling a first anchoring structure, pouring concrete at the upper end socket, installing an air inlet pipe and an air outlet pipe, and burying a filling layer.
Embodiment two:
A compressed air energy storage system comprising any of the shaft gas storage caverns of the above embodiments. Compared with an overground air storage tank, the vertical shaft air storage cave group has the advantages of being low in cost, convenient to maintain daily and free of occupying ground space. Compared with underground gas storages of other compressed air energy storage systems, the vertical shaft gas storage cave group in the implementation comprises at least one group of vertical shaft gas storage cave, each vertical shaft gas storage cave can independently operate, and the vertical shaft gas storage cave has the advantages that the number of the vertical shaft gas storage cave can be selected to operate according to requirements, and then the gas storage volume is adjusted.
Preferably, the vertical shaft gas storage cave group is positioned underground of a compressed air energy storage system factory building, and is compact in structure and convenient to maintain.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. The vertical shaft gas storage cave group is characterized by comprising at least one group of vertical shaft gas storage cave, wherein the vertical shaft gas storage cave is cylindrical and extends downwards from the ground surface longitudinally; the vertical shaft gas storage cave comprises a gas storage chamber and a filling layer, wherein the filling layer is arranged close to the ground surface, and the gas storage chamber is positioned at the lower end of the filling layer; the air storage chamber comprises an upper end socket, a lower end socket, an air storage cavity, an air inlet pipe and an air outlet pipe, wherein the upper end socket and the lower end socket are respectively connected to two ends of the air storage cavity, the upper end socket is positioned at one end close to the filling layer, and the lower end socket is positioned at one end far away from the filling layer; the air inlet pipe and the air outlet pipe are both connected to the upper sealing head.
2. The vertical shaft gas storage cave group according to claim 1, wherein the depth of the gas storage chamber is 80-160 m, and the diameter length of the cross section is 2-12 m; the depth of the filling layer is at least 20 meters; the distance between the central lines of every two vertical shaft gas storage chambers is greater than 50 meters.
3. The vertical shaft gas storage cave group according to claim 1, wherein the vertical shaft gas storage cave groups are eight groups or nine groups, and the center line distances between every two vertical shaft gas storage cave groups are the same.
4. The vertical shaft gas storage cave group as claimed in claim 1, wherein a first anchoring structure is arranged between the filling layer and the surrounding rock.
5. The vertical shaft gas storage cave group according to claim 1, wherein the structure of the gas storage cavity is as follows: the inner surface of the first concrete lining is fixedly connected with surrounding rock.
6. The vertical shaft gas storage cave group according to claim 5, wherein the steel lining layer comprises at least one section of circular steel pipe, and at least one section of pressure steel pipe is fixedly connected from bottom to top in sequence.
7. The vertical shaft gas storage cave group according to claim 1, wherein the structure of the lower seal head is: the second steel lining layer is paved on the inner surface of the second concrete lining layer, and the outer surface of the second concrete lining layer is fixedly connected with surrounding rock; the second steel lining layer is fixedly connected with the first steel lining layer.
8. The vertical shaft gas storage cave group according to claim 1, wherein the upper seal head has the structure that: the method comprises the steps that a third steel lining layer and a third concrete lining layer are sequentially arranged from inside to outside, the third steel lining layer is paved on the inner surface of the third concrete lining layer, and the outer surface of the third concrete lining layer is fixedly connected with surrounding rock; the third steel lining layer is fixedly connected with the first steel lining layer.
9. The group of shaft gas storage caverns of claim 1, wherein at least two of the groups of shaft gas storage caverns are disposed at different depths in the subsurface.
10. A compressed air energy storage system comprising a shaft air storage cavern group as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211667446.0A CN118242102A (en) | 2022-12-23 | 2022-12-23 | Vertical shaft gas storage cave group and compressed air energy storage system |
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| CN202211667446.0A CN118242102A (en) | 2022-12-23 | 2022-12-23 | Vertical shaft gas storage cave group and compressed air energy storage system |
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| CN202211667446.0A Pending CN118242102A (en) | 2022-12-23 | 2022-12-23 | Vertical shaft gas storage cave group and compressed air energy storage system |
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