Gas storage compressed gas temperature control system and method

Abstract

The invention relates to the technical field of energy storage engineering, and particularly discloses a gas storage compressed gas temperature control system and method.The gas storage compressed gas temperature control system comprises a compressed gas input device, a heat pump device, a gas storage, a sensing controller, a gas temperature increasing and pressurizing device and a compressed gas output device; the heat pump device is used for cooling high-pressure compressed gas input by the compressed gas input device, the gas storage is communicated with the heat pump device, the gas input end and the gas output end of the gas warming and pressurizing device are both communicated with the gas storage, and the gas input end of the compressed gas output device is connected with the gas input end of the gas warming and pressurizing device in parallel. And the sensor controller is respectively connected with the gas storage, the gas warming and pressurizing device and the heat pump device through signals. According to the system, the temperature of gas in the gas storage can be basically kept unchanged in the inflation and deflation processes, the gas storage cost is reduced, and the utilization rate of energy generated in the inflation and deflation processes is high.

Description

Technical Field

[0001] The present invention relates to the field of energy storage engineering technology, and in particular to a compressed gas temperature control system and method for a gas storage facility. Background Art

[0002] Among the many types of energy storage systems, gas energy storage with compressed gas as its core has gained wide recognition in the industry due to its longer energy storage time and larger energy storage capacity. From the current situation, waste gas mines and salt caverns are usually used as gas storage reservoirs. Although this method reduces the construction cost of the energy storage system to a certain extent, it will limit the site selection of the energy storage system. Therefore, the development of gas storage reservoirs for above-ground gas storage is imperative. However, in existing compressed gas energy storage projects, the cost of gas storage accounts for too high a proportion of the total cost (up to 50%), so the development of above-ground gas storage is restricted. Therefore, in order to be able to freely select a site, the cost of above-ground gas storage can be reduced through technical improvements and other means.

[0003] The cost of a gas storage facility is directly correlated with its volume. For a given storage capacity, reducing the facility's volume can effectively reduce costs. Taking a compressed gas energy storage system as an example, during the storage phase, the internal thermal parameters of the facility follow a highly variable process, with pressure and temperature rising significantly. However, this temperature increase causes a decrease in density, resulting in a smaller density difference before and after storage and a larger storage volume. Therefore, to reduce the size of a gas storage facility, the temperature rise during storage should be minimized as much as possible. Ideally, the temperature of the storage facility should remain constant. Summary of the Invention

[0004] The purpose of the present invention is to provide a compressed gas temperature control system for a gas storage reservoir, which can basically maintain the gas temperature in the gas storage reservoir unchanged during the filling and deflation process, reduce the gas storage cost, and have a high utilization rate of the energy generated during the filling and deflation process.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A compressed gas temperature control system for a gas storage reservoir comprises a compressed gas input device, a heat pump device, a gas storage reservoir, a sensor controller, a gas heating and pressurizing device, and a compressed gas output device, wherein the compressed gas input device is connected to the heat pump device, the heat pump device is used to cool the high-pressure compressed gas input by the compressed gas input device, the gas storage reservoir is connected to the heat pump device, and is used to store the compressed gas cooled by the heat pump device, the gas input end and the output end of the gas heating and pressurizing device are both connected to the gas storage reservoir, and are used to heat and pressurize the gas output from the gas storage reservoir before returning it to the gas storage reservoir, the gas input end of the compressed gas output device is connected in parallel with the gas input end of the gas heating and pressurizing device, and is used to output the compressed gas in the gas storage reservoir, the sensor controller is respectively connected to the gas storage reservoir, the gas heating and pressurizing device, and the heat pump device through signals, and is used to monitor the temperature of the compressed gas in the gas storage reservoir, and control the heat pump device to regulate the inflation temperature of the gas in the gas storage reservoir during inflation according to the monitored temperature, and / or control the gas heating and pressurizing device to regulate the discharge temperature of the gas in the gas storage reservoir during deflation.

[0007] In a further embodiment, the heat pump device includes a heat pump evaporator, a first compressor, a heat pump condenser and a first throttle valve which are connected in series to form a closed loop. The heat pump evaporator has a gas channel and a cooling medium channel which are in contact with each other and used for heat exchange. The heat pump condenser has a cooling medium channel and a heating medium channel which are in contact with each other and used for heat exchange. The first compressor is connected in series between one end of the cooling medium channel of the heat pump condenser and one end of the cooling medium channel of the heat pump evaporator. The first throttle valve is connected in series between the other end of the cooling medium channel of the heat pump condenser and the other end of the cooling medium channel of the heat pump evaporator. The gas storage and the compressed gas input device are respectively connected in series at both ends of the gas channel.

[0008] In a further solution, the gas heating and pressurizing device includes a heater, a second compressor, a first pump, a high-temperature water tank, a second pump, and a low-temperature water tank. The heater, the second compressor and the gas storage reservoir are connected in series in sequence to form a closed loop. The heater has a heating medium channel and a gas channel that are in contact with each other and used for heat exchange. The gas storage reservoir and the second compressor are respectively connected to the two ends of the gas channel of the heater, one end of the first pump and the low-temperature water tank are respectively connected to the two ends of the heating medium channel of the heater, the other end of the first pump is connected to one end of the high-temperature water tank, the other end of the high-temperature water tank is connected to one end of the second pump, and the other end of the second pump and the low-temperature water tank are respectively connected to the two ends of the heating medium channel of the heat pump condenser.

[0009] In a further solution, the sensor controller includes a sensor and a controller, the sensor includes a temperature sensor, the temperature sensor is connected to the gas storage reservoir, and is used to detect the temperature inside the gas storage reservoir. The input signal end of the controller is connected to the temperature sensor, and is used to input the temperature signal of the temperature sensor. The output signal end of the controller is respectively connected to the first pump, the first compressor and the second compressor, and is used to control the speed of the first pump, the first compressor and the second compressor, respectively.

[0010] In a further embodiment, the compressed gas input device includes a multi-stage compressor and a multi-stage cooler, which are connected in sequence to obtain high-pressure gas; the compressed gas output device includes a second throttle valve and a turbine, and the second throttle valve is connected in series between the turbine and the gas storage reservoir.

[0011] In a further embodiment, the compressed gas temperature control system of the gas storage reservoir further includes an input end of a three-way valve connected to the gas storage reservoir, and two output ends of the three-way valve are respectively connected to the input end of the heater and the input end of the compressed gas output device.

[0012] In a further solution, the compressed gas temperature control system of the gas storage reservoir also includes a heat storage device, which is connected between the compressed gas input device and the compressed gas output device, and is used to store the heat generated during the compression process of the compressed gas input device and / or output the stored heat to the compressed gas output device.

[0013] A method for controlling the temperature of compressed gas in a gas storage reservoir, comprising using any of the above-mentioned compressed gas temperature control systems for a gas storage reservoir, and comprising the following steps:

[0014] During the process of charging the gas storage, when the sensor controller detects that the temperature inside the gas storage exceeds a threshold, the heat pump device and the sensor controller regulate the charging temperature of the gas inputted into the gas storage by the compressed gas input device so that the temperature of the gas inside the gas storage does not rise above the threshold as the gas enters the gas storage;

[0015] During the process of deflation of the gas storage reservoir, when the sensor controller detects that the temperature inside the gas storage reservoir is lower than the threshold value, the temperature of a part of the deflated gas output from the compressed gas storage reservoir to the compressed gas output device is regulated by the gas heating and pressurizing device and the sensor controller, so that a part of the deflated gas is heated and then flows back to the gas storage reservoir to increase the temperature of the gas storage reservoir, so as to maintain the temperature of the gas storage reservoir; the other part of the deflated gas continues to be output to the compressed gas output device.

[0016] In a further solution, the method for controlling the temperature of compressed gas in a gas storage reservoir further includes controlling the amount of the gas released in one part and the gas released in another part by using a three-way valve.

[0017] In a further embodiment, the gas storage compressed gas temperature control method further includes:

[0018] During the process of regulating the inflation temperature, the inflation is heat exchanged through the hot water storage in the gas heating and pressurizing device; during the process of regulating the deflation temperature, the deflation is heat exchanged through the hot water storage in the gas heating and pressurizing device.

[0019] Beneficial effects of the present invention:

[0020] During the filling process of the compressed gas temperature control system for a gas storage reservoir, a heat pump device and a sensor controller are used to regulate the temperature of the gas entering the reservoir, preventing the reservoir temperature from rising as the gas enters. During the deflation process, a gas heating and pressurizing device and a sensor controller are used to raise the temperature of the gas output from the reservoir, keeping the reservoir temperature essentially constant during deflation, ultimately ensuring a near-isothermal operation.

[0021] The heat released by the gas during the inflation process is stored by hot water storage, and is used to heat up part of the output gas during the deflation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 is a schematic diagram of a compressed gas temperature control system for a gas storage facility according to an embodiment of the present invention;

[0024] In the figure: 1. Compressed gas input device; 2. Heat pump evaporator; 3. Gas storage reservoir; 4. Second compressor; 5. Three-way valve; 6. Second throttle valve; 7. Compressed gas output device; 8. Heat storage device; 9. Second pump; 10. High-temperature water tank; 11. First pump; 12. Heater; 13. Low-temperature water tank; 14. Heat pump condenser; 15. First throttle valve; 16. First compressor; 17. Sensor controller. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] like Figure 1As shown, a compressed gas temperature control system for a gas storage reservoir comprises a compressed gas input device 1, a heat pump device, a gas storage reservoir 3, a sensor controller 17, a gas heating and pressurizing device and a compressed gas output device 7, wherein the compressed gas input device 1 is connected to the heat pump device, and the heat pump device is used to cool the high-pressure compressed gas input by the compressed gas input device 1, and the gas storage reservoir 3 is connected to the heat pump device for storing the compressed gas cooled by the heat pump device, and the gas input end and the output end of the gas heating and pressurizing device are both connected to the gas storage reservoir 3 for cooling the compressed gas. The gas output from gas reservoir 3 is heated and pressurized before flowing back to gas storage 3. The gas input of the compressed gas output device 7 is connected in parallel with the gas input of the gas heating and pressurizing device, and is used to output the compressed gas from gas storage 3. The sensor controller is respectively connected to gas storage 3, the gas heating and pressurizing device, and the heat pump device via signals. It is used to monitor the temperature of the compressed gas in gas storage 3 and, based on the monitored temperature, control the heat pump device to regulate the gas temperature in gas storage 3 during inflation and / or control the gas heating and pressurizing device to regulate the gas temperature in gas storage 3 during deflation. Solid arrows in the figure indicate the direction of medium flow, and dashed arrows indicate the direction of energy transmission.

[0027] Its working principle is that when the gas storage reservoir 3 is inflated, when the sensor controller monitors that the temperature inside the gas storage reservoir 3 rises and exceeds a threshold value, the heat pump device is used to reduce the temperature of the gas input from the compressed gas input device 1 to the gas storage reservoir 3 during inflation; when the gas storage reservoir 3 is deflated, when the sensor controller monitors that the temperature inside the gas storage reservoir 3 drops and exceeds a threshold value, the gas heating and pressurizing device is used to control part of the gas output from the gas storage reservoir 3 to be heated and then returned to the gas storage reservoir 3, so that the gas in the gas storage reservoir 3 can maintain a constant temperature, thereby improving the compressed gas output efficiency, and the other part of the gas continues to be compressed and output by the gas output device 7 to meet power generation or other energy conversion operations.

[0028] According to the above working principle, some embodiments or implementation structures are provided, the heat pump device includes a heat pump evaporator 2, a first compressor 16, a heat pump condenser 14 and a first throttle valve 15 which are connected in series in sequence to form a closed loop, the heat pump evaporator 2 has a gas channel and a cooling medium channel that are in contact with each other and used for heat exchange, the heat pump condenser 14 has a cooling medium channel and a heating medium channel that are in contact with each other and used for heat exchange, the first compressor 16 is connected in series between one end of the cooling medium channel of the heat pump condenser 14 and one end of the cooling medium channel of the heat pump evaporator 2, the first throttle valve 15 is connected in series between the other end of the cooling medium channel of the heat pump condenser 14 and the other end of the cooling medium channel of the heat pump evaporator 2, and the gas storage reservoir 3 and the compressed gas input device 1 are respectively connected in series at both ends of the gas channel.

[0029] The heat pump evaporator 2 is used to cool the high-pressure compressed gas input by the compressed gas input device 1, and the cooling medium in the heat pump evaporator 2 absorbs the energy released after the gas is cooled. After absorbing the energy, the cooling medium in the heat pump evaporator 2 is compressed by the first compressor 16 and output to the heat pump condenser 14 for condensation to release heat. After the flow and pressure are adjusted by the first throttle valve 15, the heat is returned to the heat pump evaporator 2 for recirculation.

[0030] In some embodiments, the gas heating and pressurizing device includes a heater 12, a second compressor 4, a first pump 11, a high-temperature water tank 10, a second pump 9, and a low-temperature water tank 13. The heater 12, the second compressor 4, and the gas storage reservoir 3 are connected in series to form a closed loop. The heater 12 has a heating medium channel and a gas channel that are in contact with each other and used for heat exchange. The gas storage reservoir 3 and the second compressor 4 are respectively connected to the two ends of the gas channel of the heater 12. One end of the first pump 11 and the low-temperature water tank 13 are respectively connected to the two ends of the heating medium channel of the heater 12. The other end of the first pump 11 is connected to one end of the high-temperature water tank 10. The other end of the high-temperature water tank 10 is connected to one end of the second pump 9. The other end of the second pump 9 and the low-temperature water tank 13 are respectively connected to the two ends of the heating medium channel of the heat pump condenser 14. It can be understood that the mutual contact between the above-mentioned two channels can be that the outer walls are attached to each other, or the two channels are close to each other.

[0031] In some embodiments, part of the gas output from the gas storage reservoir 3 is heated by the heater 12, and the heated gas is compressed by the second compressor 4 and then returned to the gas storage reservoir 3, thereby heating the gas in the gas storage reservoir 3 so that the gas in the gas storage reservoir 3 can be maintained at a constant threshold temperature. The heater 12 can use hot water storage as a heating medium to exchange heat with part of the gas, thereby heating the gas. The hot water storage after heat exchange is returned to the low-temperature water tank 13 for storage. When the heat pump condenser 14 needs heat exchange, it flows to the heat pump condenser 14 to absorb the heat released by the condensation of the cooling medium in the heat pump condenser 14, and then flows to the high-temperature water tank 10 for storage through the action of the second pump 9. The stored high-temperature hot water storage can be drained into the heater 12 through the action of the first pump 11, and used as a heating medium for heat exchange with the above-mentioned part of the gas.

[0032] In some embodiments, the sensor controller 17 includes a sensor and a controller. The sensor includes a temperature sensor, which is connected to the gas storage reservoir 3 and is used to detect the temperature within the gas storage reservoir 3. The controller's input signal terminal is connected to the temperature sensor for inputting a temperature signal from the temperature sensor. The controller's output signal terminal is respectively connected to the first pump 11, the first compressor 16, and the second compressor 4, for controlling the speeds of the first pump 11, the first compressor 16, and the second compressor 4, respectively. Dashed lines without arrows in the figure indicate signal connections. When the temperature sensor detects that the temperature within the gas storage reservoir 3 has dropped below a rated value, the controller can increase the speeds of the first pump 11 and the second compressor 4, thereby appropriately increasing the temperature, pressure, and speed of the gas returning to the gas storage pipe, thereby improving the temperature regulation efficiency of the gas within the gas storage tank. When the temperature sensor detects that the temperature within the gas storage reservoir 3 has risen above a rated value, the controller can control the speed of the first compressor 16 to increase the flow rate and speed of the cooling medium, thereby increasing the heat exchange of the heat pump evaporator 2 and improving the cooling effect of the gas flowing through the heat pump evaporator 2 and input to the gas storage reservoir 3, thereby improving the temperature regulation efficiency of the gas within the gas storage tank.

[0033] In some embodiments, the sensor may also include a pump flow sensor and a compressor pressure sensor. The temperature sensor is connected to the gas storage reservoir 3 for detecting the temperature inside the gas storage reservoir 3. The pump flow sensor is connected to the first pump 11 for detecting the flow of heating medium transmitted by the first pump 11 to the heater 12. The compressor pressure sensor is connected to the first compressor 16 for detecting the flow of cooling medium compressed by the first compressor 16. The temperature sensor, pump flow sensor, and compressor pressure sensor are connected to the controller input signal end through a signal line, and the controller output signal end is connected to the first pump 11 and the first compressor 16 for controlling the speed of the first pump 11 and / or the first compressor 16. When the temperature sensor detects that the temperature in the gas storage reservoir 3 is too high during inflation and the heat exchange temperature of the heat pump evaporator 2 needs to be controlled, the first compressor 16 can be controlled to adjust the pressure of the compressed cooling medium of the first compressor 16 to a preset pressure value, and the pressure of the cooling medium entering the heat pump condenser 14 can be adjusted. The condenser can release heat, thereby adjusting the temperature of the high-pressure and low-temperature cooling medium. After pressure control and flow adjustment through the first throttle valve 15, it continues to be used to cool the heat pump evaporator 2. The preset pressure value can be monitored by the compressor pressure sensor. The cooling medium can be a refrigerant. When the temperature sensor detects that the temperature in the gas storage reservoir 3 is too low during deflation and the temperature of the heat exchange gas passing through the heater 12 needs to be controlled, the controller controls the first pump 11 to accelerate the rotation, so that the flow rate of the heating medium entering the heater 12 is adjusted to a preset flow rate value. The preset flow rate value can be monitored by the pump flow sensor. As the heat exchanged gas absorbs heat, the temperature of the gas heated by the heater 12 and entering the gas storage reservoir 3 reaches the control value, which is used to balance the gas temperature in the gas storage reservoir 3. This can improve energy regulation or output efficiency.

[0034] In some embodiments, the compressed gas input device 1 includes a multi-stage compressor and a multi-stage cooler, which are sequentially connected and interspersed to obtain high-pressure gas. The compressed gas output device 7 includes a second throttle valve 6 and a turbine, with the second throttle valve 6 connected in series between the turbine and the gas storage reservoir 3. By compressing air through the multi-stage compressor and the multi-stage cooler, input gas at a preset temperature and pressure can be obtained, and the heat generated can be stored in the heat storage device 8 described below.

[0035] In some embodiments, the compressed gas temperature control system for the gas storage reservoir further includes a three-way valve 5, the input end of which is in communication with the gas storage reservoir 3, and the two output ends of the three-way valve 5 are respectively in communication with the input end of the heater 12 and the input end of the compressed gas output device 7. The three-way valve 5 can regulate and distribute the gas entering the two output ends, ensuring that an appropriate amount of gas is used to maintain the temperature and pressure of the gas in the gas storage reservoir 3, while ensuring that the remaining amount of gas is used to meet the requirements of power generation or other energy conversion. It is conceivable that two one-way valves can be used in place of the three-way valve.

[0036] In some embodiments, the compressed gas temperature control system of the gas storage facility also includes a heat storage device 8, which is connected between the compressed gas input device 1 and the compressed gas output device 7, and is used to store the heat generated during the compression process of the compressed gas input device 1 and / or output the stored heat to the compressed gas output device 7.

[0037] The present invention also provides a method for controlling the temperature of compressed gas in a gas storage facility, comprising using any of the above-mentioned compressed gas temperature control systems for a gas storage facility, and comprising the following steps:

[0038] During the process of charging the gas storage 3, when the sensor controller 17 detects that the temperature inside the gas storage 3 exceeds a threshold value, the heat pump device and the sensor controller 17 regulate the charging temperature of the gas inputted into the gas storage 3 by the compressed gas input device 1, so that the temperature of the gas inside the gas storage 3 does not rise above the threshold value as the gas enters the gas storage 3;

[0039] During the process of deflation of the gas storage reservoir 3, when the sensor controller 17 detects that the temperature inside the gas storage reservoir 3 is lower than the threshold value, the temperature of a part of the deflated gas output from the compressed gas storage reservoir 3 to the compressed gas output device is regulated by the gas heating and pressurizing device and the sensor controller 17, so that a part of the deflated gas is heated and then flows back to the gas storage reservoir 3 to increase the temperature of the gas storage reservoir 3, so as to maintain the temperature of the gas storage reservoir 3; the other part of the deflated gas continues to be output to the compressed gas output device 7.

[0040] A method for controlling the temperature of compressed gas in a gas storage facility further includes controlling the amount of a portion of the gas being vented and another portion of the gas being vented by a three-way valve 5 .

[0041] A method for controlling the temperature of compressed gas in a gas storage facility further includes:

[0042] During the process of regulating the inflation temperature, the inflation is heat exchanged through the hot water storage in the gas heating and pressurizing device; during the process of regulating the deflation temperature, the deflation is heat exchanged through the hot water storage in the gas heating and pressurizing device.

[0043] A specific implementation method may be that in a compressed gas energy storage system, during the filling process of the gas storage reservoir 3, the gas enters the compressed gas input device 1 and exchanges heat with the heat storage device 8 to store thermal energy. The compressed gas input device 1 has N-stage compression and N-stage cooling. The heat storage medium used by the heat storage device 8 has N-stage circuits, N is greater than or equal to 1, and the heat storage medium may be water, molten salt, heat transfer oil, or a packed bed, etc., and high-pressure gas enters the gas storage reservoir 3. Since continuous inflation will cause the pressure and temperature of the gas storage reservoir 3 to rise, a rated value is set for the temperature of the gas storage reservoir 3. When the sensor controller 17 senses that the temperature of the gas storage reservoir 33 is higher than the rated value, the sensor controller 17 controls the first compressor 16 to increase the speed and increase the cooling capacity, so that the heat pump evaporator 2 has a cooling effect, so that the gas enters the heat pump evaporator 2 for cooling, and then enters the gas storage reservoir 3 for storage, thereby ensuring that the temperature of the gas storage reservoir 3 remains constant. In the heat pump system, water flows through the heat pump evaporator 2, absorbs heat, and then enters the first compressor 16 for compression. It then flows through the heat pump condenser 14, releasing heat, storing the heat in the high-temperature water tank 10. The water then expands through a throttle valve before returning to the heat pump evaporator 2. During deflation, gas flowing out of the gas storage 3 first passes through a three-way valve 5. A portion of the gas enters the second throttle valve 6 for pressure reduction, and then enters the turbine of the compressed gas output device 7 to generate electricity. The compressed gas output device 7 can have M stages of heating and expansion, where M is greater than or equal to 1. Because continuous deflation causes the pressure and temperature of the gas storage 3 to drop, when the sensor controller 17 senses that the temperature of the gas storage 3 is below the rated value, it controls the first pump 11 to increase the water flow rate, increasing heat release. Some of the gas enters the heater 12 to absorb the heat stored in the high-temperature water tank 10. It also controls the second compressor 4 to increase its speed, pressurizing the gas and returning it to the gas storage 3 for storage. Ultimately, this ensures a near-isothermal temperature in the gas storage 3 during both charging and deflating. When the gas heating and pressurizing device is releasing gas, the hot water in the high-temperature water tank 10 is input into the heater 12 through the first pump 11 for cooling, thereby providing heat to the gas, and then returns to the low-temperature water tank 13 after releasing the heat.

[0044] It should be noted that the terms "first," "second," etc., in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so as to facilitate the embodiments of the present application described herein.

[0045] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0046] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention as claimed.

Claims

1. A compressed gas temperature control system for a gas storage facility, characterized in that: The invention comprises a compressed gas input device (1), a heat pump device, a gas storage reservoir (3), a sensor controller (17), a gas temperature-increasing and pressure-increasing device, and a compressed gas output device (7). The compressed gas input device (1) is connected to the heat pump device. The heat pump device is used to cool the high-pressure compressed gas input by the compressed gas input device (1). The gas storage reservoir (3) is connected to the heat pump device and is used to store the compressed gas cooled by the heat pump device. The gas input end and the output end of the gas temperature-increasing and pressure-increasing device are both connected to the gas storage reservoir (3) and are used to cool the compressed gas output by the gas storage reservoir (3). The gas is heated and pressurized and then flows back to the gas storage reservoir (3). The gas input end of the compressed gas output device (7) is connected in parallel with the gas input end of the gas heating and pressurizing device, and is used to output the compressed gas in the gas storage reservoir (3). The sensor controller is respectively connected to the gas storage reservoir (3), the gas heating and pressurizing device and the heat pump device through signals, and is used to monitor the temperature of the compressed gas in the gas storage reservoir (3), and control the heat pump device to adjust the inflation temperature of the gas in the gas storage reservoir (3) when charging according to the monitored temperature, and / or control the gas heating and pressurizing device to adjust the deflation temperature of the gas in the gas storage reservoir (3) when deflation.

2. A gas storage compressed gas temperature control system according to claim 1, characterized in that: The heat pump device comprises a heat pump evaporator (2), a first compressor (16), a heat pump condenser (14) and a first throttle valve (15) which are sequentially connected in series to form a closed loop. The heat pump evaporator (2) has a gas channel and a cooling medium channel which are in contact with each other and used for heat exchange. The heat pump condenser (14) has a cooling medium channel and a heating medium channel which are in contact with each other and used for heat exchange. The first compressor (16) is connected in series between one end of the cooling medium channel of the heat pump condenser (14) and one end of the cooling medium channel of the heat pump evaporator (2). The first throttle valve (15) is connected in series between the other end of the cooling medium channel of the heat pump condenser (14) and the other end of the cooling medium channel of the heat pump evaporator (2). The gas storage (3) and the compressed gas input device (1) are respectively connected in series at both ends of the gas channel.

3. A gas storage compressed gas temperature control system according to claim 2, characterized in that: The gas heating and pressurizing device comprises a heater (12), a second compressor (4), a first pump (11), a high-temperature water tank (10), a second pump (9), and a low-temperature water tank (13). The heater (12), the second compressor (4), and the gas storage reservoir (3) are sequentially connected in series to form a closed loop. The heater (12) has a heating medium channel and a gas channel that are in contact with each other and used for heat exchange. The gas storage reservoir (3) and the second compressor (4) are respectively connected to the two ends of the gas channel of the heater (12). One end of the first pump (11) and the low-temperature water tank (13) are respectively connected to the two ends of the heating medium channel of the heater (12). The other end of the first pump (11) is connected to one end of the high-temperature water tank (10). The other end of the high-temperature water tank (10) is connected to one end of the second pump (9). The other ends of the second pump (9) and the low-temperature water tank (13) are respectively connected to the two ends of the heating medium channel of the heat pump condenser (14).

4. A gas storage compressed gas temperature control system according to claim 3, characterized in that: The sensor controller (17) includes a sensor and a controller, wherein the sensor includes a temperature sensor, the temperature sensor is connected to the gas storage reservoir (3) and is used to detect the temperature in the gas storage reservoir (3), an input signal end of the controller is connected to the temperature sensor and is used to input a temperature signal from the temperature sensor, and an output signal end of the controller is respectively connected to the first pump (11), the first compressor (16) and the second compressor (4) and is respectively used to control the rotation speeds of the first pump (11), the first compressor (16) and the second compressor (4).

5. The compressed gas temperature control system for a gas storage facility according to claim 1, characterized in that: The compressed gas input device (1) includes a multi-stage compressor and a multi-stage cooler, which are connected in sequence to obtain high-pressure gas; the compressed gas output device (7) includes a second throttle valve (6) and a turbine, and the second throttle valve (6) is connected in series between the turbine and the gas storage reservoir (3).

6. A gas storage compressed gas temperature control system according to claim 1, characterized in that: The input end of the three-way valve (5) is connected to the gas storage reservoir (3), and the two output ends of the three-way valve (5) are respectively connected to the input end of the heater (12) and the input end of the compressed gas output device (7).

7. The compressed gas temperature control system for a gas storage facility according to claim 1, characterized in that: The invention also includes a heat storage device (8), which is connected between the compressed gas input device (1) and the compressed gas output device (7) and is used to store heat generated during the compressed gas input device (1) and / or output the stored heat to the compressed gas output device (7).

8. A method for controlling the temperature of compressed gas in a gas storage facility, comprising using a gas storage facility compressed gas temperature control system according to any one of claims 1 to 7, characterized in that: The following steps are involved: During the process of charging the gas storage reservoir (3), when the sensor controller (17) detects that the temperature inside the gas storage reservoir (3) exceeds a threshold value, the charging temperature of the gas inputted into the gas storage reservoir (3) by the compressed gas input device (1) is regulated by the heat pump device and the sensor controller (17), so that the temperature of the gas inside the gas storage reservoir (3) does not rise above the threshold value as the gas enters the gas storage reservoir (3); During the process of deflation of the gas storage reservoir (3), when the sensor controller (17) detects that the temperature in the gas storage reservoir (3) is lower than a threshold value, the temperature of a portion of the deflated gas outputted from the compressed gas storage reservoir (3) to the compressed gas output device is regulated by the gas heating and pressurizing device and the sensor controller (17), so that a portion of the deflated gas is heated and then flows back to the gas storage reservoir (3) to increase the temperature of the gas storage reservoir (3) and to maintain the temperature of the gas storage reservoir (3); the other portion of the deflated gas is continuously used to be outputted to the compressed gas output device (7).

9. A method for controlling the temperature of compressed gas in a gas storage facility according to claim 8, characterized in that: The method further comprises controlling the amount of the circulating part of the deflated gas and the circulating amount of the other part of the deflated gas by means of a three-way valve (5).

10. A method for controlling compressed gas temperature in a gas storage facility according to claim 8, characterized in that: The method further comprises: During the process of regulating the inflation temperature, the inflation is heat exchanged through the hot water storage in the gas heating and pressurizing device; during the process of regulating the deflation temperature, the deflation is heat exchanged through the hot water storage in the gas heating and pressurizing device.

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