Tunnel type gas storage chamber for compressed air energy storage and construction method

Abstract

The invention relates to the technical field of compressed air energy storage, in particular to a tunnel type gas storage chamber for compressed air energy storage and a construction method. The first air storage straight channel and the second air storage straight channel which are linear are used as main chambers for storing compressed air, and the first transverse channel and the second transverse channel are transversely connected with the first air storage straight channel and the second air storage straight channel on the two sides correspondingly to form an annular channel, so that circulation can be formed in the chambers to reduce local extreme high temperature; compared with the mode that an annular channel is directly adopted for streaming, construction is more convenient; according to the scheme, the first air storage straight channel is inflated through the air inlet and outlet pipeline with the air inflation direction consistent with the axis direction of the first air storage straight channel, so that the air flow flowing back from the backflow channel can be driven to continue to flow in the air inflation direction through the inflation air flow with high air pressure and high flow speed during air inflation, and air flow self-circulation is formed; and formation of local extreme high temperature is slowed down or even avoided, and the gas storage efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to a tunnel type air storage chamber for compressed air energy storage and a construction method thereof. Background Art

[0002] Compressed air energy storage technology is a new energy storage method that uses high-pressure air to store energy. Its working principle is to use excess energy in the grid to drive the compressor to compress the air and store it in the gas storage device when the grid load is low. When the grid load is peak, the high-pressure air is released to drive the expander to do work and convert the stored energy into electrical energy. In this technology, the tunnel-type underground artificial chamber is a type of gas storage device with the advantages of convenient construction, safety and reliability, and flexible layout methods, becoming an important part of the compressed gas energy storage power station.

[0003] The gas storage pressure of the high-pressure gas storage chamber is generally around 7MPa~15MPa, which belongs to the medium-high pressure range. According to the air flow principle and simulation verification, it is found that when the gas storage chamber is inflated from normal pressure, due to the air compression and the conversion of the kinetic energy of the air inlet into internal energy, the temperature inside the chamber will continue to rise, and the temperature rise rate of each part of the chamber along the axial direction is not consistent; when one-way inflation is adopted and the gas storage chamber has a blind end, gas inflation stagnation and high temperature accumulation will occur at the blind end. As the rated gas storage pressure of the gas storage chamber continues to increase, the local extreme temperature may even reach 700 degrees Celsius. This extreme high temperature environment will cause irreversible damage to the structure and materials of the gas storage chamber. For example, the lining structure will crack and peel off, the mechanical properties of the lining concrete will be greatly degraded, and even burst; in addition, if the chamber sealing structure uses rubber materials, it will oxidize, degrade, and deform significantly under high temperature conditions, and even completely lose its shape and structural stability. In addition, adhesive materials such as epoxy resin will also completely fail under high temperature, and the structural sealing performance will be greatly degraded or even fail. In other words, local extreme high temperatures will shorten the life of the chamber, reduce the safety, stability and durability of the chamber structure, and the sealing of the chamber will be difficult to guarantee.

[0004] At present, the research on the layout of compressed air energy storage tunnel gas storage chambers mostly adopts straight or annular shapes for single chambers. For traditional straight-cylinder chambers, the gas storage chambers are arranged in a straight line underground, with a blind end and a concrete plugging head at the entrance for plugging. Gas inlet and outlet pipes are set at the plugging head for gas inlet and outlet. Compared with annular gas storage chambers, straight-cylinder gas storage chambers have the advantages of convenient construction and low cost. Figure 1The figure shows the effect simulation diagram of the temperature field distribution in a single linear gas storage chamber after it is inflated to 1MPa. It can be seen from the figure that the temperature distribution of the linear cylindrical gas storage cavern is very uneven, and the highest temperature can reach 312 degrees. In order to avoid the problem of local extreme high temperature, during the first inflation of the straight-cylindrical chamber or the inflation after maintenance, if the inlet is inflated at a normal rate, it is necessary to stop the inflation when the temperature exceeds a certain value, and continue the inflation after the local high temperature in the chamber is reduced to a normal value through heat transfer; otherwise, the inflation rate at the inlet of the gas storage chamber needs to be reduced to a small enough level to avoid local high temperature during the gas storage process. Both of these chamber inflation methods take a long time and have low gas storage efficiency. Therefore, for straight-cylindrical artificial chambers, the longer the gas storage length of a single gas storage chamber, the higher the air temperature near the tail end, and the lower the gas storage efficiency. Although the existing annular chamber can achieve better fluidity and higher gas storage efficiency by not setting up blind ends, the existence of the curvature makes the construction of the chamber difficult and the cost high. For example, at the turning point, the concrete pouring construction of the curved section lining cannot be constructed using a lining trolley, and can only be poured using a small template, resulting in low construction efficiency; the curved section structure is subjected to complex forces under the action of internal pressure, and the internal sealing structure, such as the sealing steel plate, has inconsistent inner and outer arc lengths, making the processing and welding of the sealing steel plate difficult. Summary of the invention

[0005] The purpose of the present invention is to address the problem of local extreme high temperature in the prior art straight-cylinder artificial caverns used for compressed air energy storage, which requires slowing down the inflation speed during the inflation process, resulting in long gas storage time and low gas storage efficiency. If an annular cavern is used, the difference in inner and outer chord lengths of the curved section lining concrete casting and the sealing structure leads to difficulty in splicing construction. A tunnel-type gas storage cavern and a construction method for compressed air energy storage are provided.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: A tunnel-type gas storage chamber for compressed air energy storage, comprising an energy storage unit and an auxiliary chamber, wherein the auxiliary chamber is used to communicate with the outside world; the energy storage unit comprises a plurality of linear chambers, wherein the plurality of linear chambers are connected in sequence to form an annular reflux channel, wherein the axes of all the linear chambers are arranged in a straight line, and any one of the linear chambers is connected to the auxiliary chamber; a sealing body for closing the reflux channel is arranged in the auxiliary chamber, wherein the sealing body is provided with a gas inlet and outlet pipe, and the outlet direction of the gas inlet and outlet pipe is arranged unidirectionally along the axial direction of the reflux channel.

[0007] In the tunnel-type gas storage chamber of the present scheme, a ring-shaped channel is formed by adopting several straight-type chambers to serve as a gas storage chamber for storing compressed air. Compared with directly stacking multiple traditional straight-cylinder gas storage chambers for gas storage to increase the gas storage capacity, the fluidity of a single gas storage chamber is improved, which is conducive to quickly reducing the chamber temperature. The gas storage efficiency is better than the effect of simply stacking multiple straight-cylinder gas storage chambers. In addition, compared with directly using a ring-shaped channel with an arc bend for bypass flow, the gas storage chamber composed of multiple straight-type chambers in the present scheme is more convenient to construct, and the cavern structure is more favorable for stress. Specifically, this scheme connects the reflux channel with the auxiliary chamber through any linear chamber, and sets a sealing body at the connection of the auxiliary chamber, and inflates the reflux channel by means of gas inlet and outlet pipes arranged in the same direction as the axial direction of the reflux channel. In this way, the inlet airflow can enter the gas storage chamber in one direction, and during inflation, the inlet airflow with high pressure and high flow rate is used to drive the airflow returning from the reflux channel to continue to flow in the inflation direction, thereby forming a self-circulation of airflow, which can slow down or even avoid the formation of local extreme high temperature and improve the gas storage efficiency.

[0008] As a preferred embodiment of the present invention, the plane shape of the reflux channel is a polygonal structure connected end to end, such as a triangle, rectangle, pentagon, hexagon, etc., but is not limited to the above examples. In the above reflux channel, the lengths of the linear chambers may be consistent or inconsistent, and the axes between the multiple linear chambers may also have different degrees of inclination.

[0009] As a preferred embodiment of the present invention, a plurality of the linear chambers include a first gas storage straight channel, a second gas storage straight channel, a first transverse channel and a second transverse channel, the auxiliary chamber is connected to one end of the first gas storage straight channel, the first gas storage straight channel, the second gas storage straight channel, the first transverse channel and the second transverse channel are all linear; the first gas storage straight channel, the first transverse channel, the second gas storage straight channel and the second transverse channel are connected in sequence (i.e., the first gas storage straight channel is connected to the first transverse channel, the first transverse channel is connected to the second gas storage straight channel, and the second gas storage straight channel is connected to the second transverse channel), and the other end of the second transverse channel is connected to the first gas storage straight channel. The first gas storage straight channel, the first transverse channel, the second gas storage straight channel and the second transverse channel form an annular reflux channel.

[0010] As a preferred embodiment of the present invention, the first gas storage straight channel and the second gas storage straight channel are both arranged horizontally, that is, the axis of the first gas storage straight channel and the axis of the second gas storage straight channel are both in a relatively horizontal position, and the variation range of the front-to-back height of the axis of the first gas storage straight channel / the second gas storage straight channel is small (or a small horizontal inclination angle is allowed), which does not mean that the first gas storage straight channel and the second gas storage straight channel are required to be absolutely horizontal, but they can be slightly inclined or deviated, which is more horizontal relative to "vertical".

[0011] Since most rock strata are stacked up and down and the characteristics of rock strata at the same height are the same or similar, the first gas storage straight duct and the second gas storage straight duct are arranged horizontally. This is beneficial to reducing the disturbance to the surrounding rock mass during chamber excavation, ensuring the stability of the overlying surrounding rock, and reducing the difficulty of chamber excavation.

[0012] As a preferred embodiment of the present invention, the axes of the first gas storage straight channel and the second gas storage straight channel are at the same height, which is conducive to smooth air flow and convenient construction. That is, when the horizontal inclination angle between the axis of the first gas storage straight channel and the horizontal plane is α, and the horizontal inclination angle between the axis of the second gas storage straight channel and the horizontal plane is β, then 25°≥α=β≥0°. As another possible implementation method, the axis positions of the first gas storage straight channel and the second gas storage straight channel can also be slightly staggered, one higher and the other lower.

[0013] In the above scheme, the first gas storage straight channel and the second gas storage straight channel can be arranged in parallel or not in parallel. For example, the first gas storage straight channel and the second gas storage straight channel can be arranged in an arrangement in which one end is close and the other end is far away. The lengths of the first transverse channel and the second transverse channel can be set to be the same or different. In addition, the first transverse channel and the second transverse channel can also be arranged crosswise, or connected to the gas storage straight channels on both sides at a certain inclination angle, and the two transverse channels do not intersect, which is not limited to the above examples.

[0014] As a preferred embodiment of the present invention, the first transverse channel and the second transverse channel are arranged opposite to each other (relative to the cross arrangement), and the first transverse channel is arranged closer to the entrance of the first gas storage straight channel than the second transverse channel, a first straight channel is left from the entrance end of the first gas storage straight channel to the intersection with the first transverse channel, and the outlet direction of the gas inlet and outlet pipeline is arranged along the axial direction of the first gas storage straight channel.

[0015] The outlet direction of the gas inlet and outlet pipeline is arranged along the axial direction of the first gas storage straight channel, so that the gas along the axial direction of the first gas storage straight channel is used as the starting direction of the gas circumferential flow in the reflux channel, and the gas flows back to the inlet through the first transverse channel; in the process of high-pressure gas filling into the first gas storage straight channel, it is found through research that the gas will generate vortices near the inlet due to the expansion effect, so this scheme can reduce the influence of the airflow refluxed from the first transverse channel on the airflow flowing forward along the first gas storage straight channel by arranging the first straight channel between the inlet end of the first gas storage straight channel and the intersection of the first transverse channel.

[0016] As a preferred solution of the present invention, a second straight is left from the tail end of the first gas storage straight to the intersection with the second transverse channel, a third straight is left from the end of the second gas storage straight close to the entrance to the intersection with the first transverse channel, and a fourth straight is left from the end of the second gas storage straight away from the entrance to the intersection with the second transverse channel, that is, the terminal end of the first gas storage straight is a blind end, and both ends of the second gas storage straight are blind ends, the ends of the first transverse channel are respectively connected to the first gas storage straight and the second gas storage straight, and the ends of the second transverse channel are respectively connected to the first gas storage straight and the second gas storage straight, so that the overall energy storage unit is in the shape of a ladder. The second straight, the third straight and the fourth straight are arranged to facilitate turning construction at the intersection.

[0017] As other possible implementation methods, the end of the first transverse channel can be set beyond the second gas storage straight channel, that is, a small straight section is reserved between the end of the first transverse channel and the intersection of the second gas storage straight channel; similarly, the end of the second transverse channel can also be set beyond the second gas storage straight channel, and a certain side wall position of the second transverse channel can be used as the starting point for excavating the second gas storage straight channel, not limited to the above examples.

[0018] As a preferred solution of the present invention, the tunnel-type gas storage chamber can be arranged into a chamber group. That is, the number of the energy storage units is set to several groups, several groups of the energy storage units are arranged in parallel, and several groups of the energy storage units are connected to the auxiliary chamber at the same location to increase the gas storage capacity.

[0019] The present invention also provides a construction method of a tunnel-type air storage chamber for compressed air energy storage, which uses any of the above-mentioned tunnel-type air storage chambers for compressed air energy storage, and includes the following steps: based on the auxiliary chamber, all the linear chambers are constructed so that annular reflux channels are formed between all the linear chambers.

[0020] The use of any of the above-mentioned tunnel-type gas storage chambers for compressed air energy storage for construction is not only convenient for construction, but the formed chamber structure can also form an air-filled network loop with good gas flowability.

[0021] In addition, the use of the above-mentioned gas storage chamber structure for construction can be carried out through multiple working faces at the same time, shortening the construction period. For example, in the process of constructing the reflux channel, part of the first linear chamber can be constructed first. When the first linear chamber is constructed to the specified distance, it can be constructed in two directions at the same time: one direction continues to construct the first linear chamber along the straight direction, and the other direction is to dig toward the wall of the first linear chamber to construct the second linear chamber; based on the constructed linear chamber, the next linear chamber is constructed in sequence until all the linear chambers form a circular reflux channel.

[0022] Alternatively, as another preferred embodiment of the present invention, the first gas storage straight channel may be constructed first, and based on the first gas storage straight channel, the first transverse channel and the second transverse channel may be constructed transversely; based on the first transverse channel and the second transverse channel, the second gas storage straight channel may be constructed, so that the first gas storage straight channel, the first transverse channel, the second transverse channel and the second gas storage straight channel form an annular channel as a whole, and the construction is convenient and quick.

[0023] Furthermore, as a preferred embodiment of the present invention, the above-mentioned construction method also includes the step of constructing a plurality of temporary transverse passages between the first transverse passage and the second transverse passage based on the first gas storage straight passage, wherein the temporary transverse passages are used to transversely connect the first gas storage straight passage and the second gas storage straight passage; after the construction of the second gas storage straight passage is completed, all temporary transverse passages are backfilled.

[0024] This plan is based on the first gas storage straight channel. By opening multiple transverse channels, it is beneficial to speed up the construction progress. After the construction of the second gas storage straight channel is completed, the channels except the first transverse channel and the second transverse channel at the head and tail ends are backfilled, that is, the temporary transverse channels between the first transverse channel and the second transverse channel at the head and tail ends are backfilled, which is beneficial to ensure that the cooling effect is maximized.

[0025] The chamber structure formed by the above-mentioned construction method can utilize the inflation airflow at the inlet end of the first gas storage straight channel to drive the reflux of the annular channel to continue to flow along the first gas storage straight channel during inflation, thereby forming a self-circulation of airflow, improving the situation where the existing gas storage straight channel is prone to local extreme temperatures, reducing the frequency of pressure relief and re-inflation during the entire inflation and deflation process, thereby improving the gas storage efficiency.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: The tunnel-type gas storage chamber provided by the present invention is used for compressed air energy storage. The chamber is easy to construct, low in cost, and easy to maintain. The chamber structure has good air flow and can use the inflation airflow to form a reflux self-circulation, reducing the temperature accumulation phenomenon under rapid inflation, which is beneficial to speeding up the inflation speed, improving the gas storage efficiency, and adapting to the working conditions of gas storage chambers with a longer gas storage length. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a simulation diagram of the effect of the temperature field distribution in the straight-cylindrical gas storage chamber after the chamber is inflated to 1MPa in the prior art; Figure 2 It is a structural schematic diagram of a tunnel-type air storage chamber for compressed air energy storage in Example 1; Figure 3 It is an enlarged schematic diagram of the connection between the auxiliary chamber and the first gas storage straight channel; Figure 4 This is a simulation diagram of the effect of a tunnel-type air storage chamber for compressed air energy storage in Example 1; Figure 5 It is a structural schematic diagram of a tunnel-type air storage chamber for compressed air energy storage in Example 2.

[0028] Icons: 1-first gas storage straight channel; 11-first straight channel; 12-second straight channel; 2-second gas storage straight channel; 21-third straight channel; 22-fourth straight channel; 3-auxiliary chamber; 4-sealing body; 5-gas inlet and outlet pipeline; 6-first transverse channel; 7-second transverse channel; 8-temporary transverse channel. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] Example 1 A tunnel type air storage chamber for compressed air energy storage, such as Figure 2 As shown, it includes an energy storage unit and an auxiliary chamber 3, and the auxiliary chamber 3 is used to communicate with the outside. The energy storage unit includes a plurality of linear chambers, which are connected in sequence to form a circular reflux channel, and the axes of all linear chambers are arranged in a straight line; any linear chamber is connected to the auxiliary chamber 3; a plugging body 4 for closing the reflux channel is arranged in the auxiliary chamber 3, and the plugging body 4 is provided with a gas inlet and outlet pipe 5, and the outlet direction of the gas inlet and outlet pipe 5 is arranged unidirectionally along the axial direction of the reflux channel.

[0032] Compared with directly stacking multiple straight-cylindrical gas storage chambers for gas storage, this improves the fluidity of a single gas storage chamber, is conducive to quickly reducing the chamber temperature, and has a better gas storage efficiency than the overall effect of simply stacking multiple straight-cylindrical gas storage chambers. Compared with a single straight-cylindrical gas storage chamber, the gas storage capacity is large and the length of the site occupied is small; moreover, the gas storage chamber in this scheme is organically combined by multiple straight-cylindrical chambers, which is more convenient to construct and more favorable to the force of the cavern structure than directly using an annular channel with an arc bend for bypass flow. By adopting the above scheme, by allowing the inlet airflow to enter the gas storage chamber in one direction, the inlet airflow with high air pressure and high flow rate can be used during inflation to drive the airflow returning from the annular channel to continue to flow in the inflation direction, thereby forming a self-circulation of airflow, slowing down or even avoiding the formation of local extreme high temperature, and improving the gas storage efficiency. In addition, by reducing the risk of local extreme high temperature formation in the chamber, it is conducive to avoiding the situation where the sealing layer of the cavern is damaged due to high temperature, thereby ensuring the safety of the sealing structure of the gas storage cavern.

[0033] Specifically, in this embodiment, a plurality of linear chambers include a first gas storage straight channel 1, a second gas storage straight channel 2, a first transverse channel 6, and a second transverse channel 7. The first gas storage straight channel 1, the second gas storage straight channel 2, the first transverse channel 6, and the second transverse channel 7 are all linear artificial chambers. The first gas storage straight channel 1 and the second gas storage straight channel 2 are arranged opposite to each other, and the first transverse channel 6 and the second transverse channel 7 are arranged opposite to each other. The first transverse channel 6 is arranged closer to the inlet end side of the first gas storage straight channel 1 relative to the second transverse channel 7. The first gas storage straight channel 1, the first transverse channel 6, the second gas storage straight channel 2, and the second transverse channel 7 are connected in sequence, and the second transverse channel 7 is connected to the first gas storage straight channel 1, thereby forming a reflux channel. Either end of the first gas storage straight channel 1 is used as the inlet end and connected to the auxiliary chamber 3, and the outlet direction of the gas inlet and outlet pipe 5 is arranged along the axial direction of the first gas storage straight channel 1, so that the inlet end of the first gas storage straight channel 1 is used as the starting position of the inflation airflow. Among them, the first gas storage straight channel 1, the second gas storage straight channel 2, the first transverse channel 6 and the second transverse channel 7 are all of equal cross-sectional structure, which is convenient for unified construction using a lining trolley, and the construction is convenient. Among them, the cross-sectional dimensions of the first gas storage straight channel 1 and the second gas storage straight channel 2 can be set to be consistent, and the cross-sectional dimensions of the first transverse channel 6 and the second transverse channel 7 can be set to be consistent, which is convenient for unifying the model of excavation equipment; the first transverse channel 6 and the second transverse channel 7 preferably adopt a smaller cross-sectional dimension than the first gas storage straight channel 1 to reduce the workload of excavation, and can also be consistent with the cross-sectional dimensions of the first gas storage straight channel 1 and the second gas storage straight channel 2. The length of the first transverse channel 6 and the second transverse channel 7 is controlled as much as possible to be more than 3 times the width of the first gas storage straight channel 1 or the second gas storage straight channel 2, preferably 4-6 times the width, so that multiple straight-cylinder gas storage caverns will not affect each other.

[0034] Furthermore, in this embodiment, it is preferred that the first gas storage straight channel 1 and the second gas storage straight channel 2 are both arranged horizontally, and specifically, a slope of 1%-3% can be arranged to facilitate drainage. The chamber structure is arranged relatively horizontally, which is conducive to the chamber structure resisting internal and external pressures, and the rock formation has a relatively stable pressure resistance; the axes of the first gas storage straight channel 1 and the second gas storage straight channel 2 are at the same height position, and the gas storage chamber is in the same plane as a whole, which is conducive to smooth air flow and convenient construction.

[0035] In this embodiment, the first gas storage straight channel 1 and the second gas storage straight channel 2 are arranged in parallel, and the first transverse channel 6 vertically connects the first gas storage straight channel 1 and the second gas storage straight channel 2, and the second transverse channel 7 vertically connects the first gas storage straight channel 1 and the second gas storage straight channel 2, so the construction route is short, and the construction is convenient and fast. In this embodiment, the length of the first gas storage straight channel 1 is consistent with the length of the second gas storage straight channel 2, and the two ends of the first gas storage straight channel 1 and the second gas storage straight channel 2 are aligned, which is conducive to the uniform flow of air in the annular chamber.

[0036] Among them, a first straight channel 11 is left from the entrance end of the first gas storage straight channel 1 to the intersection with the first transverse channel 6, and a second straight channel 12 is left from the tail end of the first gas storage straight channel 1 to the intersection with the second transverse channel 7; a third straight channel 21 is left from the end of the second gas storage straight channel 2 close to the entrance to the intersection with the first transverse channel 6, and a fourth straight channel 22 is left from the end of the second gas storage straight channel 2 far from the entrance to the intersection with the second transverse channel 7. The setting of the first straight channel 11 can reduce the influence of the airflow backflowing from the first transverse channel 6 on the airflow flowing forward along the first gas storage straight channel 1; the setting of the second straight channel 12, the third straight channel 21 and the fourth straight channel 22 facilitates the construction of the intersection, and their lengths are preferably short when the construction conditions are met.

[0037] The above-mentioned gas storage chamber also includes a vertical shaft or an inclined shaft, and the vertical shaft / inclined shaft is connected to the auxiliary chamber 3. The axis of the auxiliary chamber 3 in this embodiment is arranged on the same horizontal plane as the axis of the first gas storage straight channel 1, and the horizontal angle between the axis of the auxiliary chamber 3 and the first gas storage straight channel 1 is θ, which is preferably set to 90°≤θ≤180°. Figure 3 As shown, the auxiliary chamber 3 and the first gas storage straight channel 1 are arranged on the same straight line or connected with the inflation direction at a large angle, so that they are arranged close to the same axis, which is convenient for construction and avoids drilling above the gas storage area for gas storage as much as possible, which is beneficial to the stability of the surrounding rock. Alternatively, as another possible implementation method, the transportation channel can be directly extended to the ground through a longer auxiliary chamber.

[0038] As another possible implementation mode, another transverse channel may be provided between the first transverse channel 6 and the second transverse channel 7 to connect the first gas storage straight channel 1 and the second gas storage straight channel 2, and a circulating flow may be formed in the chamber.

[0039] According to simulation verification, during the inflation process, the inlet gas enters the first gas storage straight channel 1 from the gas inlet and outlet pipe 5. After the flow field stabilizes, the gas will flow from the first gas storage straight channel 1 along other transverse channels (temporary transverse channel 8 and second transverse channel 7) except those near the inlet end into the second gas storage straight channel 2, and finally flow back to the first gas storage straight channel 1 from the first transverse channel 6 near the inlet end, forming a Figure 1 The circulation flow is shown in Figure 2. According to the simulation of temperature effect, Figure 4 As shown, the air velocity distribution in the first gas storage straight channel 1 and the second gas storage straight channel 2 is relatively uniform, there is no area close to zero velocity, and the maximum temperature is 140 degrees. Therefore, the temperature distribution in the entire artificial gas storage chamber is basically uniform, and the maximum temperature is close to the average temperature, which is better than the temperature control effect of the linear cylindrical gas storage chamber in the prior art.

[0040] The gas storage chamber provided in this embodiment is used for compressed air energy storage. The chamber is easy to construct, low in cost, and easy to maintain. The chamber structure can form airflow reflux and use the inflated airflow to form a reflux self-circulation, which is beneficial to speed up the inflation speed, improve the gas storage efficiency, and expand the gas storage length scale of the existing straight-cylinder gas storage chamber to increase the gas storage capacity. The above-mentioned gas storage chamber structure can be used to carry out relevant transformation work on the existing straight-cylinder gas storage chamber groups such as traditional rake type, comb type, and fishbone type, so as to improve the temperature control ability of the existing gas storage chamber and realize resource reuse.

[0041] Furthermore, one or more guide plates with arc-shaped structures can be set at the intersection or turning section of the above-mentioned gas storage chamber to achieve smooth turning of airflow, control unidirectional flow of airflow, avoid vortex formation, and promote smooth flow of airflow. In this way, the temperature distribution during inflation will be more uniform, which is more conducive to temperature control of the gas storage chamber; if multiple guide plates are arranged at intervals, the airflow can be stratified, so that the air flows in layers with less interference between layers, reducing the energy impact of the airflow on the cave wall, which is conducive to reducing energy loss and improving energy utilization.

[0042] Example 2 Based on Example 1, this embodiment also provides a tunnel-type gas storage chamber for compressed air energy storage. The tunnel-type gas storage chamber in this embodiment adopts a chamber group arrangement structure, such as Figure 5 As shown, the number of the energy storage units is set in several groups, and the energy storage units are arranged in parallel. The energy storage units are connected to the same auxiliary chamber, and the gas storage capacity is large. The auxiliary chamber is comb-shaped and is connected to several energy storage units through connecting branches.

[0043] Example 3 Based on Example 1, this embodiment also provides a construction method of a tunnel-type gas storage chamber for compressed air energy storage, using the above-mentioned tunnel-type gas storage chamber for compressed air energy storage, comprising the following steps: S1: Based on the auxiliary chamber 3, the first gas storage straight channel 1 is excavated, so that the excavation lengths of the first gas storage straight channel 1 and the second gas storage straight channel 2 are basically the same, and a certain length of straight channel is reserved at the end to facilitate the intersection construction, and the construction positions corresponding to the first transverse channel 6 and the second transverse channel 7 are determined in the first gas storage straight channel 1.

[0044] S2: Based on the first gas storage straight channel 1, the first transverse channel 6 and the second transverse channel 7 can be constructed horizontally at the same time, which is conducive to shortening the construction period; in order to speed up the construction progress, a temporary transverse channel 8 can be excavated between the first transverse channel 6 and the second transverse channel 7 at the same time. The setting of the temporary transverse channel 8 can determine whether to excavate or determine the specific number of temporary transverse channels 8 according to the overall scale requirements of the gas storage chamber to ensure the safety of the chamber excavation.

[0045] S3: Based on the first transverse channel 6 and the second transverse channel 7, the second gas storage straight channel 2 is constructed to achieve two-way excavation and speed up the construction process. If a temporary transverse channel 8 is provided, two-way excavation can be performed based on the temporary transverse channel 8 at the same time. After the excavation of the second gas storage straight channel 2 is completed, the temporary transverse channel 8 is backfilled to ensure that the airflow circulation efficiency in the cave is maximized and the temperature in the cave is quickly reduced. This solution is convenient and fast to construct with low cost.

[0046] Numerical simulation analysis proves that although multiple temporary transverse passages 8 are set between the first gas storage straight channel 1 and the second gas storage straight channel 2 to connect, the progress of the chamber construction can be improved, but with the increase of airflow routes, the cooling effect is reduced. Therefore, in this embodiment, during the construction period, multiple temporary passages can be started to speed up the excavation progress of the chamber, and it is preferred to backfill them in the later stage.

[0047] As another possible implementation method, the above-mentioned gas storage chamber structure can also be used for further modification of the existing straight-cylindrical gas storage chamber, that is, based on the first gas storage straight channel 1 connected to the auxiliary chamber 3, the first transverse channel 6 and the second transverse channel 7 are transversely constructed at the side wall, and then based on the first transverse channel 6 and the second transverse channel 7, the second gas storage straight channel 2 is transversely constructed, so that the first gas storage straight channel 1, the first transverse channel 6, the second transverse channel 7 and the second gas storage straight channel 2 form a ring channel as a whole, thereby improving the phenomenon that the existing straight-cylindrical gas storage chamber is prone to extremely high temperature at the rear end of the chamber, and at the same time solving the problem of the existing ring-shaped gas storage chamber being difficult to construct and having high cost.

[0048] The chamber structure formed by the construction method of this scheme has a relatively large airflow velocity near the gas inlet and outlet pipe 5 during inflation, and a relatively low velocity in the second gas storage pipe and each transverse channel. After the gas enters the chamber along the pipe, the high-speed airflow at the inlet end can push the low-speed airflow refluxed from the first transverse channel 6 to flow along the first gas storage straight channel 1. The flow at a place farther from the inlet gradually becomes mainly unidirectional, and the airflow in the second gas storage straight channel 2 continuously refluxes through the first transverse channel 6. The airflow at a relatively low velocity at a distance in the first gas storage straight channel 1 will enter the second gas storage straight channel 2 through the second transverse channel 7, thereby forming a self-circulation of airflow, improving the situation where the existing gas storage straight channel is prone to local extreme temperatures, thereby greatly shortening the time for the first inflation and inflation after maintenance, and improving the gas storage efficiency.

[0049] Example 4 The present embodiment also provides a tunnel-type air storage chamber for compressed air energy storage. Compared with Example 1, the difference of this embodiment mainly lies in that the structural shape of the energy storage unit has no blind ends. In this embodiment, the cross-sectional dimensions of several linear chambers are consistent, and several linear chambers are connected end to end to form a reflux channel in a polygonal structural form. The plane shape of the reflux channel can be a triangle, rectangle, pentagon or hexagon, etc. The auxiliary chamber can be vertically connected to the side wall of any linear chamber, and can also be connected to the end of any linear chamber to form a "b" shape. Multiple linear chambers are connected to each other at a large angle, and there is no blind end at the end of the linear chamber.

[0050] Example 5 Based on the tunnel-type gas storage chamber for compressed air energy storage in Example 1 or Example 4, this embodiment also provides a construction method of a tunnel-type gas storage chamber for compressed air energy storage, comprising the following steps: First, part of the first linear chamber is constructed. When the first linear chamber is constructed to the specified distance, it is constructed in two directions at the same time: one direction is to continue to construct the first linear chamber along the straight line, and the other direction is to excavate toward the wall of the first linear chamber to construct the second linear chamber; Based on the linear chamber that has been constructed, the next linear chamber is constructed in sequence until all the linear chambers form a circular reflux channel. The simultaneous construction of multiple working surfaces is conducive to shortening the construction period.

[0051] It should be noted that, in the description of the specific embodiments of the present invention, the terms "horizontal" and "parallel" and the like, unless otherwise specified, do not mean that the corresponding structures are required to be absolutely horizontal or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding structures are set in directions such as "horizontal" and "parallel", and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding structure is arranged within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0052] In addition, the expressions "first" and "second" in the terms are only used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components. In addition, in the description of the embodiments of the present invention, "several" represents at least 2, and can be any of 2, 3, 4, 5, 6, 7, 8, 9, etc., and can even be more than 9.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tunnel-type gas storage chamber for compressed air energy storage, comprising an energy storage unit and an auxiliary chamber (3), wherein the auxiliary chamber (3) is used to communicate with the outside, and is characterized in that: The energy storage unit comprises a plurality of linear chambers, the plurality of linear chambers are connected in sequence to form an annular reflux channel, the axes of all the linear chambers are arranged in a straight line, and any one of the linear chambers is connected to the auxiliary chamber (3); A sealing body (4) for sealing the reflux channel is provided in the auxiliary chamber (3); the sealing body (4) is provided with a gas inlet and outlet pipe (5); the outlet direction of the gas inlet and outlet pipe (5) is unidirectionally arranged along the axial direction of the reflux channel.

2. A tunnel-type air storage chamber for compressed air energy storage according to claim 1, characterized in that: The plane shape of the reflux channel is a polygonal structure connected end to end.

3. The tunnel-type air storage chamber for compressed air energy storage according to claim 1, characterized in that: The plurality of linear chambers comprise a first gas storage straight channel (1), a second gas storage straight channel (2), a first transverse channel (6) and a second transverse channel (7); the auxiliary chamber (3) is connected to one end of the first gas storage straight channel (1); the first gas storage straight channel (1), the first transverse channel (6), the second gas storage straight channel (2) and the second transverse channel (7) are connected in sequence; and the other end of the second transverse channel (7) is connected to the first gas storage straight channel (1).

4. A tunnel-type air storage chamber for compressed air energy storage according to claim 3, characterized in that: The first gas storage straight channel (1) and the second gas storage straight channel (2) are both arranged horizontally, and the axes of the first gas storage straight channel (1) and the second gas storage straight channel (2) are at the same height.

5. The tunnel-type air storage chamber for compressed air energy storage according to claim 3, characterized in that: The first transverse channel (6) and the second transverse channel (7) are arranged opposite to each other, and the first transverse channel (6) is arranged closer to the entrance of the first gas storage straight channel (1) than the second transverse channel (7), a first straight channel (11) is left from the entrance end of the first gas storage straight channel (1) to the intersection with the first transverse channel (6), and the outlet direction of the gas inlet and outlet pipeline (5) is arranged along the axial direction of the first gas storage straight channel (1).

6. A tunnel-type air storage chamber for compressed air energy storage according to claim 5, characterized in that: A second straight channel (12) is left from the tail end of the first gas storage straight channel (1) to the intersection with the second transverse channel (7), a third straight channel (21) is left from the end of the second gas storage straight channel (2) close to the entrance to the intersection with the first transverse channel (6), and a fourth straight channel (22) is left from the end of the second gas storage straight channel (2) away from the entrance to the intersection with the second transverse channel (7).

7. A tunnel-type air storage chamber for compressed air energy storage according to any one of claims 1 to 6, characterized in that: The energy storage units are provided in a plurality of groups, and the plurality of groups of energy storage units are arranged in parallel, and the plurality of groups of energy storage units are connected to the auxiliary chamber (3) at the same location.

8. A construction method for a tunnel-type gas storage chamber for compressed air energy storage, characterized in that: A tunnel-type air storage chamber for compressed air energy storage according to any one of claims 1 to 7 comprises the following steps: based on the auxiliary chamber (3), all the linear chambers are constructed so that annular reflux channels are formed between all the linear chambers.

9. The construction method according to claim 8, characterized in that: The steps of constructing the reflux channel include: First, part of the first linear chamber is constructed. When the first linear chamber is constructed to the specified distance, it is constructed in two directions at the same time: one direction is to continue to construct the first linear chamber along the straight line, and the other direction is to excavate toward the wall of the first linear chamber to construct the second linear chamber; Based on the constructed linear chamber, the next linear chamber is constructed in sequence until all the linear chambers form a circular reflux channel; Alternatively, in the case of adopting a tunnel-type gas storage chamber for compressed air energy storage as claimed in any one of claims 3 to 5, the step of constructing the return channel comprises: first constructing a first gas storage straight channel (1), and based on the first gas storage straight channel (1), laterally constructing a first transverse channel (6) and a second transverse channel (7); based on the first transverse channel (6) and the second transverse channel (7), simultaneously constructing the second gas storage straight channel (2).

10. The construction method according to claim 9, characterized in that: In the case of using a tunnel-type gas storage chamber for compressed air energy storage as described in any one of claims 3 to 5, the step of constructing the reflux channel also includes the following steps: Based on the first gas storage straight channel (1), at least one temporary transverse channel (8) is constructed between the first transverse channel (6) and the second transverse channel (7), wherein the temporary transverse channel (8) is used to transversely connect the first gas storage straight channel (1) and the second gas storage straight channel (2); After the construction of the second gas storage straight channel (2) is completed, all temporary transverse channels (8) are backfilled.

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