Liquefied air storage system

Abstract

The invention relates to a liquefied air storage system which comprises an air filtering system, an air liquefaction system and a liquefied air storage system, and air leakage detection and early warning structures are arranged at an outlet of the air filtering system and an inlet of the air liquefaction system; the liquid leakage detection early warning structure is arranged at an outlet of the air liquefaction system and an inlet of the liquefied air storage system, the liquefied air storage system, the air liquefaction system, the air leakage detection early warning structure and the liquid leakage detection early warning structure are all connected with the monitoring control system, and the monitoring control system is connected with the maintenance early warning structure. And inlet and outlet pipelines of the liquefied air storage system are provided with valves. By arranging the air leakage detection early warning structure and the liquid leakage detection early warning structure, the situation that the working efficiency of the system is affected by air leakage in the system intercommunication process can be relieved, the whole system is monitored through the monitoring control system to ensure normal operation of the system, maintenance early warning can be controlled when abnormity occurs, and flow speed control can be conducted through arranging a valve.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage equipment, and in particular relates to a liquefied air storage system. Background Art

[0002] As a new type of energy storage technology, the liquefied air storage system is an energy storage system that uses cryogenic technology to liquefy and store air. It includes the energy storage stage and the energy release stage. The energy storage stage is to use electricity or renewable energy during off-peak hours to compress the purified air to a high-pressure state through a multi-stage compressor, and then cool it step by step in the heat exchanger, and finally release it through a cryogenic expander or throttle valve and store it in a liquid air storage tank. At the same time, the compression heat is recovered and stored in the corresponding hot tank. In the energy release stage, the stored liquid air is pumped to a higher deflation pressure, and the stored cold energy is used to increase liquid and gas production and energy efficiency. The high-pressure air is heated by ambient heat, then superheated by the stored compression heat, and finally expanded to generate electricity and release energy.

[0003] In this process, the liquid air storage tank plays an extremely important role as a transfer device. The common liquid air storage tank is a cylinder with an arc-shaped top. The liquid filling port and the liquid outlet are generally set at the top and cannot be adjusted. In the process of storing the liquefied air in the liquid air storage tank, it is easy for the pipeline to rupture and the liquefied air to leak, affecting the efficiency of the device.

[0004] In summary, the prior art has the problem that the injection port and the liquid outlet cannot control the flow rate of the injection and the liquid outlet, and the entire system pipeline has a problem of no timely warning of air leakage and liquid leakage. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of the present invention to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] Therefore, the purpose of the present invention is to provide a liquefied air storage system, which can solve the problem that the liquid injection port and the liquid outlet cannot control the flow rate of liquid injection and liquid discharge in the prior art, and the entire system pipeline cannot be warned in time when there is a gas leakage or liquid leakage problem. The present invention provides a liquefied air storage system, which includes an air filtration system, an air liquefaction system and a liquefied air storage system, an air leakage detection and warning structure is arranged at the outlet of the air filtration system and the inlet of the air liquefaction system; a liquid leakage detection and warning structure is arranged at the outlet of the air liquefaction system and the inlet of the liquefied air storage system, the liquefied air storage system, the air liquefaction system, the air leakage detection and warning structure and the liquid leakage detection and warning structure are all connected to a monitoring and control system, the monitoring and control system is connected to a maintenance and warning system, and the inlet and outlet pipelines of the liquefied air storage system are provided with valves.

[0007] Optionally, the detection and control system has a central controller and a display screen.

[0008] Optionally, the gas leakage detection and warning structure is two gas flow meters, which are respectively arranged at the inlet of the air liquefaction system and the outlet of the air filtration system, and transmit the detected data to the monitoring and control system.

[0009] Optionally, the liquefied air storage system is a liquefied air storage tank, and the hydraulic air storage tank comprises, from the inside to the outside, an inner liner, a temperature insulation layer, a vacuum layer, a buffer layer and an outer shell, a temperature sensor and a humidity sensor are respectively arranged at the inner top of the liquefied air storage system, a first pressure detector is arranged at the inner bottom of the liquefied air storage system, a first control connector is fixedly arranged at the upper top on the left side of the liquefied air storage system, and the first control connector is connected to the interior through a first liquid injection port, and a liquid outlet control connector is fixedly arranged at the lower top on the right side of the liquefied air storage system, and the liquid outlet control connector is connected to the interior through the liquid outlet port.

[0010] Optionally, a second control connector is provided below the first control connector, and the second control connector is connected to the interior via a second liquid injection port, and both the second liquid injection port and the first liquid injection port are downwardly inclined ports.

[0011] Optionally, the left side of the first control connector comprises, from the inside to the outside, an inner liner, a thermal insulation layer, a vacuum layer, a buffer layer and an outer shell; a gradient spiral is arranged on the left side of the inner liner, and the gradient spiral is matched with the spiral mouth of the pipeline; a knob is arranged on the top of the first control connector, and the knob is fixedly connected to the rotating column; the rotating column and the rotary valve are a whole; a second rubber ring is arranged on the outside of the rotary valve, and the second rubber ring is matched with the first rubber ring in the inner liner; the vacuum layer is in the middle of the rotary valve, and the two sides of the vacuum layer are thermal insulation layers.

[0012] Optionally, the first control connector, the second control connector and the liquid outlet control connector have the same structure.

[0013] Optionally, the second control connector and the liquid pump are spirally connected via a hose, and the liquid pump is connected to a liquid leakage detection and warning structure.

[0014] Optionally, the upper part of the leakage detection and warning structure is a pipeline opening, above the pipeline opening is a rubber layer, below is a filter layer, below the filter layer is a liquid storage tank, and a second pressure detector is arranged inside the liquid storage tank, and the second pressure detector is connected to the monitoring and control system.

[0015] In summary, the present invention includes at least one of the following beneficial effects: The present invention can alleviate the impact of air leakage on the system's working efficiency during system communication by setting up an air leakage detection and early warning structure and a liquid leakage detection and early warning structure. The entire system can be monitored by a monitoring control system to ensure the normal operation of the system. If an abnormality occurs, control and maintain early warning, and the valve setting can control the flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A schematic diagram of a liquefied air storage system of the present invention; Figure 2 A schematic diagram of the storage structure of a liquefied air storage system of the present invention; Figure 3 It is a schematic diagram of the valve structure of a liquefied air storage system of the present invention; Figure 4 A side view of a valve blocking structure of a liquefied air storage system of the present invention; Figure 5 A liquid leakage detection and early warning structure for a liquefied air storage system of the present invention List of illustration symbols: 1. First liquid filling port; 2. Buffer layer; 3. Vacuum layer; 4. Insulation layer; 5. Temperature sensor; 6. Humidity sensor; 7. Knob; 8. Gradient spiral; 9. First control connector; 10. Second control connector; 11. Second liquid filling port; 12. First pressure detector; 13. Liquid outlet control connector; 14. Rotating column; 15. Rotating valve; 16. First rubber ring; 17. Second rubber ring; 18. Rubber layer; 19. Pipeline port; 20. Liquid storage tank; 21. Second pressure detector; 22. Liquid pump; 23. Hose; 24. Air filtration system; 25. Leakage detection and warning structure; 26. Air liquefaction system; 27. Leakage detection and warning structure; 28. Liquefied air storage system; 29. ​​Monitoring and control system; 30. Maintenance warning. Implementation

[0018] The following is combined with Figure 1-5 The present invention is described in further detail.

[0019] Embodiment 1, refer to Figure 1-5 In order to solve the problem that the liquid injection port and the liquid outlet cannot control the flow rate of liquid injection and liquid discharge in the prior art, and the entire system pipeline cannot be warned in time when there is a gas leakage or liquid leakage problem, the present invention discloses a liquefied air storage system, including an air filtration system 24, an air liquefaction system 26 and a liquefied air storage system 28, a gas leakage detection and warning structure 25 is arranged at the outlet of the air filtration system 24 and the inlet of the air liquefaction system 26; a liquid leakage detection and warning structure 27 is arranged at the outlet of the air liquefaction system 26 and the inlet of the liquefied air storage system 28, the liquefied air storage system 28, the air liquefaction system 26, the gas leakage detection and warning structure 25 and the liquid leakage detection and warning structure 27 are all connected to a monitoring and control system 29, the monitoring and control system 29 is connected to a maintenance warning 30, the inlet and outlet pipelines of the liquefied air storage system 28 are provided with valves, and the detection and control system 29 has a central controller and a display screen.

[0020] The setting of the gas leakage detection warning structure 25 and the liquid leakage detection warning structure 27 ensures that there is no gas leakage between the air filtration system 24 and the air liquefaction system 26, and there is no liquid leakage between the air liquefaction system 26 and the liquefied air storage system 28, thereby ensuring the liquefaction efficiency of the system. The results of the gas leakage detection warning structure 25 and the liquid leakage detection warning structure 27 are transmitted to the central controller in the monitoring and control system 29. The central control system determines whether it needs to be submitted to the maintenance warning 30 through comparison and other processing, and displays the data on the display screen to facilitate subsequent monitoring of the system. The setting of the valve can control the flow rate of the liquid inlet and outlet to avoid damage to the inside of the liquefied air storage system 28 caused by too fast flow rate.

[0021] The gas leakage detection and warning structure 25 is two gas flow meters, which are respectively arranged at the inlet of the air liquefaction system 26 and the outlet of the air filtration system 24 , and transmit the detected data to the monitoring and control system 29 .

[0022] The data on the two gas flow meters are compared by the leakage detection warning structure 25, and compared with the preset interval by the central controller in the monitoring control system 29. If it does not meet the reasonable range, it will be transmitted to the maintenance warning 30 for warning processing, so as to facilitate subsequent targeted maintenance.

[0023] The liquefied air storage system 18 is a liquefied air storage tank, which includes an inner liner, a thermal insulation layer 4, a vacuum layer 3, a buffer layer 2 and an outer shell from the inside to the outside. The temperature sensor 5 and the humidity sensor 6 are respectively arranged at the inner top of the liquefied air storage system 28, and the first pressure detector 12 is arranged at the inner bottom of the liquefied air storage system 28. A first control connector 9 is fixedly arranged on the upper top of the left side of the liquefied air storage system 28, and the first control connector 9 is connected to the interior through the first liquid filling port 1. A liquid outlet control connector 13 is fixedly arranged on the lower top of the right side of the liquefied air storage system 28, and the liquid outlet control connector 13 is connected to the interior through the liquid outlet.

[0024] The temperature sensor 5, the humidity sensor 6 and the first pressure detector 12 are used to detect the state of the liquefied air in the liquefied air storage system 28, and the data are transmitted to the central controller in the monitoring and control system 29 for processing to determine whether to start the maintenance warning 30, which is an alarm.

[0025] A second control connector 10 is disposed below the first control connector 9 . The second control connector 10 is connected to the interior via a second liquid injection port 11 . Both the second liquid injection port 11 and the first liquid injection port 11 are downwardly inclined.

[0026] The second liquid injection port 11 and the first liquid injection port 1 are both downwardly inclined to prevent liquid from accumulating in the pipeline, so that liquid air can enter the liquefied air storage system 28 better.

[0027] The left side of the first control connector 9 comprises, from the inside to the outside, an inner liner, a thermal insulation layer 4, a vacuum layer 3, a buffer layer 2 and an outer shell. A gradient spiral 8 is arranged on the left side of the inner liner, and the gradient spiral 8 is matched with the spiral mouth of the pipeline. A knob 7 is arranged on the top of the first control connector 9. The knob 7 is fixedly connected to a rotating column 14. The rotating column 14 and the rotary valve 15 are a whole. A second rubber ring 17 is arranged on the outside of the rotary valve 15, and the second rubber ring 17 is matched with the first rubber ring 16 in the inner liner. The middle of the rotary valve 15 is a vacuum layer 3, and the two sides of the vacuum layer 3 are thermal insulation layers 4. The first control connector 9, the second control connector 10 and the liquid outlet control connector 13 have the same structure.

[0028] By connecting the gradient spiral 8 and the pipeline, liquid leakage can be effectively alleviated. The knob 7 controls the rotating column 14, and the rotating column 14 controls the rotation of the rotary valve 15 to control the flow of the liquid inlet and the liquid outlet. The first control connector 9 and the rotary valve 15 are both provided with a vacuum layer 3 and a thermal insulation layer 4 to isolate the external temperature and ensure the stability of the system. The cooperation of the second rubber ring 17 and the first rubber ring 16 can prevent liquid and air leakage.

[0029] The second control connector 10 and the liquid pump 22 are spirally connected through a hose 23, and the liquid pump 22 is connected to a leakage detection and early warning structure 27. The upper part of the leakage detection and early warning structure 27 is a pipeline opening 19, and above the pipeline opening 19 is a rubber layer 18, and below is a filter layer, and below the filter layer is a liquid storage tank 20. A second pressure detector 21 is arranged inside the liquid storage tank 20, and the second pressure detector 21 is connected to a monitoring and control system 29.

[0030] A vacuum layer 3 is set on the outer circle of the leakage detection and warning structure 27, and a rubber layer 18 is set on the upper part to avoid gasification caused by temperature changes. The liquefied air will fall into the interior of the liquid storage tank 20, and the second pressure detector 21 will provide the pressure data to the monitoring and control system 29. The monitoring and control system 29 reports the fault to the maintenance and warning 30. When maintenance is required, the liquid pump 22 can be opened to transfer the internal hydraulic air to the liquefied air storage system 28 through the hose 23.

[0031] The above are all preferred embodiments of the present invention, and the protection scope of the invention is not limited thereby. Therefore, any equivalent changes made according to the structure, shape, principle and method of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquefied air storage system, comprising an air filtration system (24), an air liquefaction system (26) and a liquefied air storage system (28), characterized in that: The system further comprises an air leakage detection and early warning structure (25) arranged at the outlet of the air filtration system (24) and the inlet of the air liquefaction system (26); a liquid leakage detection and early warning structure (27) arranged at the outlet of the air liquefaction system (26) and the inlet of the liquefied air storage system (28); the liquefied air storage system (28), the air liquefaction system (26), the air leakage detection and early warning structure (25) and the liquid leakage detection and early warning structure (27) are all connected to a monitoring and control system (29); the monitoring and control system (29) is connected to a maintenance early warning system (30); and the inlet and outlet pipelines of the liquefied air storage system (28) are provided with valves.

2. A liquefied air storage system according to claim 1, characterized in that: The detection control system (29) is provided with a central controller and a display screen.

3. A liquefied air storage system according to claim 2, characterized in that: The gas leakage detection and early warning structure (25) is two gas flow meters, which are respectively arranged at the inlet of the air liquefaction system (26) and the outlet of the air filtration system (24), and transmit the detected data to the monitoring and control system (29).

4. A liquefied air storage system according to claim 1, characterized in that: The liquefied air storage system (28) is a liquefied air storage tank. The liquefied air storage tank comprises, from the inside to the outside, an inner liner, a temperature insulation layer (4), a vacuum layer (3), a buffer layer (2) and an outer shell. The temperature sensor (5) and the humidity sensor (6) are respectively arranged at the inner top of the liquefied air storage system (28). The first pressure detector (12) is arranged at the inner bottom of the liquefied air storage system (28). A first control connector (9) is fixedly arranged at the upper top of the left side of the liquefied air storage system (28). The first control connector (9) is connected to the interior through a first liquid injection port (1). A liquid outlet control connector (13) is fixedly arranged at the lower top of the right side of the liquefied air storage system (28). The liquid outlet control connector (13) is connected to the interior through the liquid outlet port.

5. A liquefied air storage system according to claim 4, characterized in that: A second control connector (10) is provided below the first control connector (9); the second control connector (10) is connected to the interior via a second liquid injection port (11); the second liquid injection port (11) and the first liquid injection port (1) are both downwardly inclined ports.

6. A liquefied air storage system according to claim 5, characterized in that: The left side of the first control connector (9) comprises, from the inside to the outside, an inner liner, a thermal insulation layer (4), a vacuum layer (3), a buffer layer (2) and an outer shell. A gradient spiral (8) is arranged on the left side of the inner liner, and the gradient spiral (8) is matched with the spiral opening of the pipeline. A knob (7) is arranged on the top of the first control connector (9). The knob (7) is fixedly connected to a rotating column (14). The rotating column (14) and the rotary valve (15) are an integral whole. A second rubber ring (17) is arranged on the outside of the rotary valve (15). The second rubber ring (17) is matched with the first rubber ring (16) in the inner liner. The vacuum layer (3) is in the middle of the rotary valve (15), and the thermal insulation layers (4) are arranged on both sides of the vacuum layer (3).

7. A liquefied air storage system according to claim 6, characterized in that: The first control connector (9), the second control connector (10) and the liquid outlet control connector (13) have the same structure.

8. A liquefied air storage system according to claim 5, characterized in that: The second control connector (10) and the liquid pump (22) are spirally connected via a hose (23), and the liquid pump (22) is connected to a liquid leakage detection and warning structure (27).

9. A liquefied air storage system according to claim 1, characterized in that: The upper half of the liquid leakage detection and early warning structure (27) is a pipeline opening (19), the upper part of the pipeline opening (19) is a rubber layer (18), the lower part is a filter layer, the lower part of the filter layer is a liquid storage tank (20), a second pressure detector (21) is arranged inside the liquid storage tank (20), and the second pressure detector (21) is connected to the monitoring and control system (29).

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