Gas storage

Abstract

The invention discloses a gas storage which comprises a gas storage body, a rotating shaft arranged in the gas storage body and a driving device arranged outside the gas storage body. One end of the rotating shaft is rotationally connected with the inner wall of the gas storage body, and the other end penetrates through the side wall of the gas storage body and is connected with the output end of the driving device; a plurality of impellers are arranged on the rotating shaft in the length direction, a cavity is formed in a blade of each impeller, and a phase change material is arranged in each cavity and exchanges heat with gas in the gas storage body. According to the gas storage, the technical problem of how to achieve constant-temperature gas charging and discharging of the gas storage is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of novel energy storage, and in particular relates to a gas storage facility. Background Art

[0002] Compressed air energy storage technology is a key technology to achieve peak shaving and valley filling in conventional power systems, and to improve the efficiency, safety, and economy of conventional energy generation and transmission. It is also the core foundation for promoting open sharing and flexible trading of energy production and consumption, achieving multi-energy synergy, building an energy Internet, and promoting power system reform. Accelerating the development of energy storage technology and industry is of great strategic significance for building a "clean, low-carbon, safe and efficient" modern energy industry system and promoting energy transformation.

[0003] At present, when the gas storage is inflated and deflated, the temperature of the gas in the storage will change with the process of inflation and deflation, which puts forward very high sealing requirements for the sealing materials of the gas storage. It is not only necessary to prevent gas leakage, but also to keep the performance stable during repeated temperature changes without deformation and cracking. The requirements are relatively high. If the constant temperature inflation and deflation of the gas storage can be achieved, it will be beneficial to the stability of the flow state of the gas in the storage, and at the same time reduce the requirements for the sealing materials of the gas storage, which will have a positive effect on the stable operation of the gas storage. Summary of the invention

[0004] In order to solve the problems existing in the prior art, the present invention aims to provide a gas storage reservoir, which can solve the technical problem of how to achieve constant temperature charging and discharging of the gas storage reservoir.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A gas storage reservoir comprises a gas storage reservoir body, and its structural features are: it also comprises a rotating shaft arranged in the gas storage reservoir body and a driving device arranged outside the gas storage reservoir body; one end of the rotating shaft is rotatably connected to the inner wall of the gas storage reservoir body, and the other end passes through the side wall of the gas storage reservoir body and is connected to the output end of the driving device; a plurality of impellers are arranged on the rotating shaft along the length direction, and at least one cavity is arranged on the blades of the impeller, and a phase change material is arranged in the cavity.

[0007] Since phase change materials can utilize latent heat to store heat, and the heat storage density is relatively large, phase change materials can be materials with high thermal conductivity and high latent heat of phase change, such as lauric acid, n-decanoic acid, eicosane, docosane, calcium chloride hexahydrate, sodium sulfate decahydrate, disodium hydrogen phosphate dodecahydrate, sodium carbonate decahydrate, etc., which can be selected according to actual working conditions and needs. The drive device can be an electric motor, and the shaft can be sealed by a dry gas sealing structure at the side wall of the gas storage body. During the filling and discharging process of the gas storage, heat is exchanged between the phase change material and the gas in the gas storage body, thereby adjusting the temperature in the gas storage. During the filling and discharging process of the gas storage, high-pressure gas enters the gas storage body through the filling and discharging pipes. As the gas pressure inside the gas storage body increases, the temperature inside it gradually rises. At this time, the phase change material in the gas storage body will absorb heat and undergo phase changes due to the increase in internal temperature. The phase change material melts and absorbs a large amount of latent heat, and the rotating shaft rotates under the action of the driving device to enhance convective heat transfer. The combined effect of the two can significantly reduce the temperature of the gas in the gas storage reservoir body. During the deflation process of the gas storage reservoir, after the high-pressure gas is discharged through the charging and discharging pipes, the high-pressure gas inside the gas storage reservoir body decreases, and the internal temperature also decreases accordingly. At this time, the phase change material in the gas storage reservoir body will release heat and undergo a phase change due to the decrease in internal temperature. The phase change material solidifies and releases heat, and the rotating shaft rotates under the action of the driving device to enhance convective heat transfer. The combined effect of the two can significantly increase the temperature in the gas storage reservoir. The gas storage of the present invention, by arranging a phase change material in the gas storage reservoir body, when the temperature in the gas storage reservoir changes, the phase change of the phase change material is used to absorb or release heat, thereby reducing the fluctuation of the gas temperature in the gas storage reservoir body and achieving constant temperature operation of the gas storage reservoir. The gas storage of the present invention improves the convective heat transfer capacity in the gas storage body by providing a rotating shaft and an impeller, shortens the time for the gas temperature distribution in the gas storage body to reach equilibrium, thereby making the gas storage filling and discharging process more stable, achieving higher power generation efficiency, and reducing operating costs. The gas storage of the present invention can reduce the storage capacity of the gas storage to a limited extent under the same installed capacity, thereby shortening the construction period of the overall gas storage project.

[0008] Preferably, the impeller is provided with a plurality of blades, the plurality of blades are arranged along the circumference of the rotating shaft, and each blade is provided with a plurality of cavities along the length direction.

[0009] Preferably, the cavity includes a first cavity and a second cavity, and a phase change material is arranged in the first cavity; along the length direction of the blade, the first cavity and the second cavity are arranged alternately, and the first cavity and the second cavity are respectively arranged at the roots of two adjacent blades. Phase change material is only arranged in the first cavity, and no phase change material is arranged in the second cavity. The phase change material is arranged at intervals on the blade, and the phase change materials on two adjacent blades are arranged in a staggered manner. When the phase change material does not undergo a phase change, the rotating shaft is in a state of torque balance. When the gas is filled and discharged in the gas storage reservoir, causing the phase change material to undergo a phase change, the position of the phase change material is bound to change, which in turn causes the torque of the rotating shaft to be unbalanced, thereby causing the rotating shaft to rotate, and the power for the continuous rotation of the rotating shaft mainly comes from the driving device. The gas storage reservoir of the present invention can save energy by arranging the setting position of the phase change material so that part of its power is converted from the gravity of the phase change material when the rotating shaft rotates.

[0010] Preferably, the shaft is provided with a sleeve, and the plurality of impellers are arranged in the sleeve; both ends of the sleeve along the length direction are fixedly connected to the inner wall of the gas storage body, and the sleeve is provided with a plurality of first ventilation units along the length direction. By providing a plurality of first ventilation units, the impellers are driven by the shaft to rotate, so that the surrounding air is accelerated, and the surrounding air enters and exits through the first ventilation units, thereby driving the gas in the entire gas storage body to accelerate, strengthen heat transfer, and enhance the uniformity of temperature distribution in the gas storage body.

[0011] Preferably, the sleeve is provided with distributed optical fibers and multiple groups of second ventilation units along the length direction, and the distributed optical fibers are arranged along the second ventilation units. By providing the distributed optical fibers, the real-time flow state of the gas inside the gas storage body is monitored, including parameters such as temperature, humidity, and flow rate, thereby achieving real-time monitoring of key parameters of the gas storage operation.

[0012] Preferably, the distributed optical fiber is electrically connected to a central control console disposed outside the gas storage body, and the central control console is electrically connected to the driving device. The distributed optical fiber runs through the side wall of the gas storage body and can be equipped with an aviation plug. The central control console studies and analyzes the data fed back by the distributed optical fiber and adjusts the energy supply of the driving device to achieve real-time adjustment of the rotation speed of the shaft, thereby making the gas storage filling and deflation process more stable and achieving higher power generation efficiency.

[0013] Preferably, along the length direction of the sleeve, the first ventilation units and the second ventilation units are arranged alternately, and the impeller is disposed between the first ventilation units and the second ventilation units.

[0014] Specifically, each group of the first ventilation units is provided with a plurality of first ventilation holes, which are strip ventilation holes and are evenly arranged along the circumference of the sleeve; each group of the second ventilation units is provided with a plurality of second ventilation holes, which are circular ventilation holes and are evenly arranged along the length and circumference of the sleeve. The circular ventilation holes are used to install distributed optical fibers, and the opening area of ​​the strip ventilation holes is relatively large, which can reduce the weight of the sleeve structure and reduce costs, and can also increase the ventilation volume.

[0015] Preferably, the melting point of the phase change material is in the range of 40 to 60°C. When no phase change material is provided, the gas temperature control in the gas storage reservoir body can be varied in the range of 0 to 80°C, and the variation range depends on the filling and discharging speed, filling and discharging time, gas storage reservoir structure and physical properties of sealing materials, etc., and the temperature of the gas storage reservoir body is in the range of 40 to 60°C for a long time. In order to reduce the high and low temperature difference, a phase change material with a phase change temperature in the range of 40 to 60°C is selected, and a phase change material with a high thermal conductivity and a high latent heat of phase change can accelerate the heat absorption and release rate of the phase change material and increase the heat absorption and release.

[0016] Preferably, the volume of the phase change material is 85-95% of the volume of the cavity.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The gas storage of the present invention has a phase change material disposed in the gas storage body. When the temperature in the gas storage changes, the phase change of the phase change material is used to absorb or release heat, thereby reducing the fluctuation of the gas temperature in the gas storage body and realizing the constant temperature operation of the gas storage;

[0019] 2. The gas storage of the present invention improves the convective heat transfer capacity in the gas storage body by providing a rotating shaft and an impeller, shortens the time for the gas temperature distribution in the gas storage body to reach equilibrium, thereby making the filling and discharging process of the gas storage more stable, achieving higher power generation efficiency, and reducing operating costs;

[0020] 3. The gas storage of the present invention can reduce the storage capacity of the gas storage to a limited extent under the same installed capacity, thereby shortening the construction period of the overall gas storage project;

[0021] 4. The gas storage of the present invention arranges the position of the phase change material so that part of the power of the rotating shaft is converted from the gravity of the phase change material when the rotating shaft rotates, which can save energy;

[0022] 5. The gas storage of the present invention is provided with a sleeve and a first ventilation unit on the sleeve, so that the surrounding air is accelerated when the impeller is driven by the rotating shaft to rotate, and the surrounding air enters and exits through the first ventilation unit, thereby driving the gas in the entire gas storage body to accelerate the movement, strengthening heat transfer, and enhancing the uniformity of temperature distribution in the gas storage body;

[0023] 6. The gas storage of the present invention can monitor the temperature, humidity and other parameters inside the gas storage body in real time by setting distributed optical fibers, thereby achieving real-time monitoring and adjustment of key parameters of the gas storage operation;

[0024] 7. In the gas storage of the present invention, the central control console studies and analyzes the data fed back by the distributed optical fiber, and adjusts the energy supply of the driving device to achieve real-time regulation of the rotation speed of the shaft, thereby making the filling and discharging process of the gas storage more stable and achieving higher power generation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the gas storage of the present invention;

[0026] Figure 2 yes Figure 1 Schematic diagram of the middle sleeve structure;

[0027] Figure 3 yes Figure 1 Schematic diagram of the rotating shaft and impeller structure;

[0028] Figure 4 yes Figure 3 Schematic diagram of the arrangement structure of phase change material on the blades of the middle impeller;

[0029] Figure 5 yes Figure 1 Schematic diagram of the medium dry gas seal structure;

[0030] Figure 6 yes Figure 1 Schematic diagram of the fixed sleeve structure.

[0031] In the figure:

[0032] 1-gas storage body, 2-sleeve, 201-first ventilation unit, 201-1 first ventilation hole, 202-second ventilation unit, 202-1-second ventilation hole, 3-impeller, 301-blade, 302-cavity, 302-1-first cavity, 302-2-second cavity, 4-distributed optical fiber, 5-central control console, 6-driving device, 7-charging and discharging pipes, 8-fixed sleeve, 9-aviation plug, 10-dry sealing structure, 11-rotating shaft, 12-phase change material. DETAILED DESCRIPTION

[0033] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict. For the convenience of description, if the words "upper", "lower", "left" and "right" appear in the following, they only indicate that the upper, lower, left and right directions are consistent with the drawings themselves, and do not limit the structure.

[0034] like Figure 1 As shown, the gas storage provided in this embodiment includes a gas storage body 1, a rotating shaft 11 arranged in the gas storage body 1, and a driving device 6 arranged outside the gas storage body 1. The gas storage body 1 is provided with a gas charging and discharging pipe 7. The rotating shaft 11 is arranged along the length direction of the gas storage body 1, and the driving device 6 adopts an electric motor. Figure 1 , Figure 5 and Figure 6 As shown, one end of the rotating shaft 2 along the length direction is rotatably connected to the inner wall of the gas storage body 1, and a fixed sleeve 8 is provided at the connection point, and the other end passes through the side wall of the gas storage body 1 and is connected to the output end of the driving device 3, and a dry gas sealing structure 10 is provided at the penetration point for sealing. Figure 3 As shown, the rotating shaft 2 is provided with a plurality of impellers 3 at intervals along the length direction. Figure 4 As shown, the impeller 3 is provided with a plurality of blades 301, and the plurality of blades 301 are arranged circumferentially along the rotating shaft 11, and each blade 301 is provided with a plurality of cavities 302 along the length direction. The cavity 302 includes a first cavity 302-1 and a second cavity 302-2, and a phase change material 12 is arranged in the first cavity 302-1, while no phase change material is arranged in the second cavity 302-2, and the volume of the phase change material 12 is 85 to 95% of the volume of the first cavity 302-1. Along the length direction of the blade 301, the first cavity 302-1 and the second cavity 302-2 are arranged alternately, and the first cavity 302-1 and the second cavity 302-2 are respectively arranged at the roots of two adjacent blades 301. The phase change material 12 is lauric acid, and the phase change temperature of lauric acid is 43.5 to 48.2°C. As shown Figure 1 and Figure 2As shown, the rotating shaft 11 is provided with a sleeve 2, and a plurality of impellers 3 are arranged in the sleeve 2, and the sleeve 2 is welded to the gas storage reservoir body 1. The sleeve 2 is provided with a plurality of groups of first ventilation units 201 and a plurality of groups of second ventilation units 202 along the length direction, and the first ventilation units 201 and the second ventilation units 202 are arranged alternately along the length direction of the sleeve 2, and the impeller 3 is arranged between the first ventilation units 201 and the second ventilation units 202. Each group of first ventilation units 201 is provided with a plurality of first ventilation holes 201-1, and the first ventilation holes 201-1 are strip-shaped ventilation holes, and the plurality of first ventilation holes 201-1 are evenly arranged along the circumferential direction of the sleeve 2. Each group of second ventilation units 202 is provided with a plurality of second ventilation holes 202-1, and the second ventilation holes 202-1 are circular ventilation holes, and the plurality of second ventilation holes 202-1 are evenly arranged along the length and circumferential direction of the sleeve 2. The second ventilation hole 202-1 is provided with a distributed optical fiber 4, which is electrically connected to a central control console 5 disposed outside the gas storage reservoir body 1, and the central control console 5 is electrically connected to a driving device 6. The distributed optical fiber 4 penetrates the side wall of the gas storage reservoir body 1, and an aviation plug 9 is provided at the penetration point.

[0035] When the gas storage is inflated, high-pressure gas enters the gas storage body 1 through the gas filling and discharging pipe 7. As the high-pressure gas inside the gas storage body 1 increases, the temperature inside it gradually rises. At this time, the phase change material 12 in the gas storage body 1 absorbs the internal heat to produce a phase change, changing from solid to liquid, so that the overall center of gravity of the impeller 3 also changes, thereby causing the impeller 3 to rotate. At the same time, under the action of the driving device 6, the rotating shaft 11 drives the impeller 3 to rotate continuously, thereby driving the local air around the impeller 3 to accelerate the movement, and the air enters and exits through the first ventilation hole 201-1, thereby driving the gas in the entire gas storage body 1 to accelerate the movement, strengthening the heat exchange between the phase change material 12 and the high-temperature gas, and enhancing the uniformity of the temperature distribution in the gas storage body 1. The phase change of the phase change material 12 is used to absorb heat, thereby reducing the fluctuation of the gas temperature in the gas storage body 1 and realizing the constant temperature operation of the gas storage. When the gas storage is deflated, the high-pressure gas is discharged to the outside of the gas storage body 1 through the gas filling and discharging pipe 7. As the high-pressure gas inside the gas storage body 1 decreases, the temperature inside it gradually decreases. At this time, the phase change material 12 inside the gas storage body 1 changes phase due to the decrease in internal temperature, from liquid to solid, so that the overall center of gravity of the impeller 3 also changes, thereby causing the impeller 3 to rotate. At the same time, under the action of the driving device 6, the rotating shaft 11 drives the impeller 3 to rotate continuously, thereby driving the local air around the impeller 3 to accelerate the movement, and the air enters and exits through the first ventilation hole 201-1, thereby driving the gas in the entire gas storage body 1 to accelerate the movement, strengthening the heat exchange between the phase change material 12 and the low-temperature gas, and enhancing the uniformity of the temperature distribution in the gas storage body 1. The phase change of the phase change material 12 is used to release heat, thereby reducing the fluctuation of the gas temperature in the gas storage body 1 and realizing the constant temperature operation of the gas storage.

[0036] The distributed optical fiber 4 on the sleeve 2 can monitor the real-time flow state of the gas inside the gas storage body 1, including parameters such as temperature, humidity, and flow rate, and feed the data back to the central control console 5, and study the monitoring data to analyze the flow state of the gas inside the gas storage body 1 and the characteristics of the arranged phase change material 12. The constant temperature point of the gas storage is the temperature point where the morphology of the phase change material 12 changes. The constant temperature operation of the gas storage is achieved by monitoring and controlling the morphology of the phase change material 12. At the same time, the central control console 5 adjusts the energy supply of the drive device 7 according to the real-time data, and controls the rotation speed of the shaft 11 to make the gas temperature inside the gas storage uniform and stable, thereby achieving the purpose of constant temperature operation of the gas storage.

[0037] The contents explained in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the present invention, and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the embodiments made by those skilled in the art fall within the scope defined by the claims attached to the present invention.

Claims

1. A gas storage reservoir, comprising a gas storage reservoir body (1), characterized in that: It also includes a rotating shaft (11) arranged in the gas storage reservoir body (1) and a driving device (6) arranged outside the gas storage reservoir body (1); one end of the rotating shaft (11) is rotatably connected to the inner wall of the gas storage reservoir body (1), and the other end passes through the side wall of the gas storage reservoir body (1) and is connected to the output end of the driving device (6); A plurality of impellers (3) are arranged on the rotating shaft (11) along the length direction, and at least one cavity (302) is arranged on the blades (301) of the impeller (3), and a phase change material (12) is arranged in the cavity (302).

2. The gas storage according to claim 1, characterized in that: The impeller (3) is provided with a plurality of blades (301), the plurality of blades (301) are arranged circumferentially along the rotating shaft (11), and each blade (301) is provided with a plurality of cavities (302) along the length direction.

3. The gas storage according to claim 2, characterized in that: The cavity (302) comprises a first cavity (302-1) and a second cavity (302-2), and a phase change material (12) is arranged in the first cavity (302-1); along the length direction of the blade (301), the first cavity (302-1) and the second cavity (302-2) are arranged alternately, and the first cavity (302-1) and the second cavity (302-2) are respectively arranged at the roots of two adjacent blades (301).

4. The gas storage according to claim 1, characterized in that: The rotating shaft (11) is provided with a sleeve (2) on its outer shell, and a plurality of impellers (3) are arranged in the sleeve (2); both ends of the sleeve (2) along the length direction are fixedly connected to the inner wall of the gas storage reservoir body (1), and the sleeve (2) is provided with a plurality of groups of first ventilation units (201) along the length direction.

5. The gas storage according to claim 4, characterized in that: The sleeve (2) is provided with distributed optical fibers (4) and a plurality of groups of second ventilation units (202) along the length direction, and the distributed optical fibers (4) are arranged along the second ventilation units (202).

6. The gas storage according to claim 5, characterized in that: The distributed optical fiber (4) is electrically connected to a central control console (5) arranged outside the gas storage reservoir body (1), and the central control console (5) is electrically connected to a driving device (6).

7. The gas storage according to claim 5, characterized in that: Along the length direction of the sleeve (2), the first ventilation units (201) and the second ventilation units (202) are arranged alternately, and the impeller (3) is arranged between the first ventilation unit (201) and the second ventilation unit (202).

8. The gas storage according to claim 5, characterized in that: Each group of the first ventilation units (201) is provided with a plurality of first ventilation holes (201-1), the first ventilation holes (201-1) are strip-shaped ventilation holes, and the plurality of first ventilation holes (201-1) are evenly arranged along the circumferential direction of the sleeve (2); each group of the second ventilation units (202) is provided with a plurality of second ventilation holes (202-1), the second ventilation holes (202-1) are circular ventilation holes, and the plurality of second ventilation holes (202-1) are evenly arranged along the length and circumferential direction of the sleeve (2).

9. The gas storage according to any one of claims 1 to 8, characterized in that: The melting point of the phase change material (12) is in the range of 40 to 60°C.

10. The gas storage according to any one of claims 1 to 8, characterized in that: The volume of the phase change material (12) is 85-95% of the volume of the cavity (302).

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