Carbon dioxide circulating cooling system

Abstract

The utility model discloses a carbon dioxide circulating cooling system which comprises a high-temperature and high-pressure gas storage tank, a gas-liquid heat exchanger, a throttle valve, a liquid storage tank, an energy release component, a heat-conducting medium and a carbon dioxide circulating cooling mechanism, the heat-conducting medium comprises a first heat-conducting medium tank and a second heat-conducting medium tank; the carbon dioxide circulating cooling mechanism comprises a gas storage tank, a regulating valve and a direct injection cooling part which are sequentially connected with the energy release assembly, a liquid inlet of the direct injection cooling part is connected with an outlet of the second heat-conducting medium tank, a liquid outlet of the direct injection cooling part is connected with an inlet of the first heat-conducting medium tank, and a gas inlet of the direct injection cooling part is connected with an outlet of the regulating valve. The device is reasonable in design, the cooling capacity of the low-temperature carbon dioxide after energy release and the heat after heat exchange of the heat-conducting medium are effectively utilized, the heat-conducting medium can be cooled, the low-temperature carbon dioxide after energy release can be heated, and the energy consumed by subsequent evaporation and compression of the carbon dioxide is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of compressed gas energy storage, in particular to a carbon dioxide circulation cooling system. Background Art

[0002] To address energy shortages and climate change and achieve sustainable development, many countries and regions around the world have established carbon neutrality goals. The "Implementation Plan for Science and Technology Support for Carbon Peaking and Carbon Neutrality" guides the scientific and technological innovation work on carbon peaking and carbon neutrality within the scientific and technological community, as well as relevant industries, sectors, localities, and enterprises.

[0003] Compressed carbon dioxide energy storage technology has been widely developed and applied in recent years. CO2's excellent thermophysical properties make it a particularly effective energy storage system. With a critical point of 31.3°C, CO2 reaches a supercritical state more easily than air, making its liquefaction easier. However, when compressed CO2 energy storage is used for refrigeration and temperature control, the released CO2 is often directly evaporated and compressed into the next cycle, ignoring the cooling capacity of the low-temperature CO2. This evaporation and compression process also consumes significant energy, reducing system efficiency.

[0004] Therefore, a rationally designed carbon dioxide circulation cooling system is needed to effectively utilize the cooling capacity of the low-temperature carbon dioxide after energy release and the heat after heat exchange with the heat transfer medium. It can not only cool the heat transfer medium but also heat the low-temperature carbon dioxide after energy release, reducing the energy consumed in the subsequent evaporation and compression of carbon dioxide and improving system efficiency. Utility Model Content

[0005] The technical problem to be solved by the present invention is to provide a carbon dioxide circulation cooling system in response to the above-mentioned deficiencies in the prior art. The system has a reasonable design and effectively utilizes the cooling capacity of the low-temperature carbon dioxide after energy release and the heat after heat exchange with the heat-conducting medium. It can not only cool the heat-conducting medium but also heat the low-temperature carbon dioxide after energy release, thereby reducing the energy consumed in the subsequent evaporation and compression of the carbon dioxide and improving the system efficiency.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a carbon dioxide circulating cooling system, characterized by comprising a high-temperature and high-pressure gas storage tank, a gas-liquid heat exchanger, a throttle valve, a liquid storage tank and an energy release component connected in sequence, a heat-conducting medium connected to the gas-liquid heat exchanger, and a carbon dioxide circulating cooling mechanism connected to the energy release component and cooling the heat-conducting medium;

[0007] The heat transfer medium includes a first heat transfer medium tank and a second heat transfer medium tank, the outlet of the first heat transfer medium tank is connected to the liquid inlet of the gas-liquid heat exchanger, and the inlet of the second heat transfer medium tank is connected to the liquid outlet of the gas-liquid heat exchanger;

[0008] The carbon dioxide circulation cooling mechanism includes a gas storage tank, a regulating valve and a direct injection cooling component which are sequentially connected to the energy release component. The liquid inlet of the direct injection cooling component is connected to the outlet of the second heat transfer medium tank, the liquid outlet of the direct injection cooling component is connected to the inlet of the first heat transfer medium tank, and the air inlet of the direct injection cooling component is connected to the outlet of the regulating valve.

[0009] The above-mentioned carbon dioxide circulating cooling system is characterized in that: the high-temperature and high-pressure gas storage tank is connected to the air inlet of the gas-liquid heat exchanger, and the throttle valve is connected to the air outlet of the gas-liquid heat exchanger;

[0010] The air outlet of the direct injection cooling element is connected to the inlet of the compressor, and the outlet of the compressor is connected to the high-temperature and high-pressure gas storage tank.

[0011] The above-mentioned carbon dioxide circulating cooling system is characterized in that: a first control valve is provided between the outlet of the first heat transfer medium tank and the liquid inlet of the gas-liquid heat exchanger, and a second control valve is provided between the inlet of the second heat transfer medium tank and the gas-liquid heat exchanger;

[0012] A third control valve is provided between the liquid inlet of the direct-injection cooling element and the outlet of the second heat transfer medium tank, and a fourth control valve is provided between the liquid outlet of the direct-injection cooling element and the inlet of the first heat transfer medium tank.

[0013] The above-mentioned carbon dioxide circulating cooling system is characterized in that a first temperature sensor is provided on the first heat transfer medium tank, and a second temperature sensor is provided on the second heat transfer medium tank.

[0014] The above-mentioned carbon dioxide circulating cooling system is characterized in that the energy-releasing component is a carbon dioxide ice maker.

[0015] The above-mentioned carbon dioxide circulation cooling system is characterized in that: the direct injection cooling component includes a box body, a carbon dioxide pipeline arranged on the box body and connected to the outlet of the regulating valve and a plurality of injection branches connected to the carbon dioxide pipeline and extending into the box body, and a heat transfer medium pipeline running through the box body, the liquid inlet and liquid outlet of the heat transfer medium pipeline extend out of the box body, the liquid inlet of the heat transfer medium pipeline is connected to the outlet of the second heat transfer medium tank, and the liquid outlet of the heat transfer medium pipeline is connected to the inlet of the first heat transfer medium tank.

[0016] The above-mentioned carbon dioxide circulation cooling system is characterized in that: the box is connected to a carbon dioxide outlet pipe and a clean gas pipeline;

[0017] The bottom of the injection branch pipe is close to the heat transfer medium pipeline, and a nozzle is provided at the bottom of the injection branch pipe.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. The utility model sets a heat-conducting medium as a cold source to cool the high-temperature and high-pressure gas output from the high-temperature and high-pressure gas storage tank, so as to facilitate subsequent self-condensation into liquid carbon dioxide, which is input into the energy release component for refrigeration and temperature adjustment to meet the needs of the carbon dioxide compression energy storage refrigeration system.

[0020] 2. The carbon dioxide channel and the heat transfer medium channel in the direct injection cooling part of the utility model are both pipes, which adopt a non-direct contact method to exchange heat and cold; and the carbon dioxide enters the direct injection cooling part by direct injection, which can make the heat transfer medium cooling effect better and more efficient, and at the same time make the carbon dioxide heating effect better and more efficient.

[0021] 3. The utility model does not completely release the cooling capacity of the carbon dioxide after energy release, so the low-temperature carbon dioxide released by the energy release component is used to cool the heat transfer medium after heat exchange, thereby improving the cooling efficiency of the system's heat transfer medium, reducing energy waste, and improving energy storage efficiency;

[0022] At the same time, the carbon dioxide after releasing energy is heated by a heat-conducting medium and enters the next cycle, realizing a gas energy storage cycle and improving energy utilization efficiency. Compared with the conventional method of discharging excess heat, this method is more environmentally friendly, safe and economical.

[0023] In summary, the utility model has a reasonable design and effectively utilizes the cooling capacity of the low-temperature carbon dioxide after energy release and the heat after heat exchange with the heat-conducting medium. It can not only cool the heat-conducting medium, but also heat the low-temperature carbon dioxide after energy release, thereby reducing the energy consumed in the subsequent evaporation and compression of the carbon dioxide and improving the system efficiency.

[0024] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the present utility model.

[0026] Figure 2 This is a schematic structural diagram of the direct injection cooling component of the utility model.

[0027] Description of the accompanying drawings:

[0028] 1—High-temperature and high-pressure gas storage tank; 2—Gas-liquid heat exchanger; 3—Throttle valve;

[0029] 4—Liquid storage tank; 5—Energy release assembly; 6—Gas storage tank;

[0030] 7—regulating valve; 8—direct injection cooling element; 8-1—tank;

[0031] 8-2—Carbon dioxide pipeline; 8-3—Clean gas pipeline; 8-4—Heat transfer medium pipeline;

[0032] 8-5—Injection branch pipe; 8-6—Nozzle; 8-7—CO2 outlet pipe;

[0033] 9-1—first heat transfer medium tank; 9-2—second heat transfer medium tank;

[0034] 9-3—first control valve; 9-4—second control valve;

[0035] 9-5—Third control valve; 9-6—Fourth control valve; 10—Compressor;

[0036] 11—First temperature sensor; 12—Connecting pipe; 13—Second temperature sensor. DETAILED DESCRIPTION

[0037] like Figure 1 and Figure 2 As shown, the utility model includes a high-temperature and high-pressure gas storage tank 1, a gas-liquid heat exchanger 2, a throttle valve 3, a liquid storage tank 4 and an energy release component 5 connected in sequence, as well as a heat-conducting medium connected to the gas-liquid heat exchanger 2 and a carbon dioxide circulation cooling mechanism connected to the energy release component 5 and cooling the heat-conducting medium;

[0038] The heat transfer medium includes a first heat transfer medium tank 9-1 and a second heat transfer medium tank 9-2, the outlet of the first heat transfer medium tank 9-1 is connected to the liquid inlet of the gas-liquid heat exchanger 2, and the inlet of the second heat transfer medium tank 9-2 is connected to the liquid outlet of the gas-liquid heat exchanger 2;

[0039] The carbon dioxide circulation cooling mechanism includes a gas storage tank 6, a regulating valve 7 and a direct injection cooling component 8 which are connected in sequence to the energy release component 5. The liquid inlet of the direct injection cooling component 8 is connected to the outlet of the second heat transfer medium tank 9-2, the liquid outlet of the direct injection cooling component 8 is connected to the inlet of the first heat transfer medium tank 9-1, and the air inlet of the direct injection cooling component 8 is connected to the outlet of the regulating valve 7.

[0040] In this embodiment, the high-temperature and high-pressure gas storage tank 1 is connected to the air inlet of the gas-liquid heat exchanger 2, and the throttle valve 3 is connected to the air outlet of the gas-liquid heat exchanger 2;

[0041] The air outlet of the direct injection cooling element 8 is connected to the inlet of the compressor 10 , and the outlet of the compressor 10 is connected to the high-temperature and high-pressure gas storage tank 1 .

[0042] In this embodiment, a first control valve 9-3 is provided between the outlet of the first heat transfer medium tank 9-1 and the liquid inlet of the gas-liquid heat exchanger 2, and a second control valve 9-4 is provided between the inlet of the second heat transfer medium tank 9-2 and the gas-liquid heat exchanger 2;

[0043] A third control valve 9-5 is provided between the liquid inlet of the direct injection cooling element 8 and the outlet of the second heat transfer medium tank 9-2, and a fourth control valve 9-6 is provided between the liquid outlet of the direct injection cooling element 8 and the inlet of the first heat transfer medium tank 9-1.

[0044] In this embodiment, a first temperature sensor 13 is provided on the first heat transfer medium tank 9 - 1 , and a second temperature sensor 10 is provided on the second heat transfer medium tank 9 - 2 .

[0045] In this embodiment, the energy release component 5 is a carbon dioxide ice maker.

[0046] like Figure 2 As shown, in this embodiment, the direct injection cooling member 8 includes a box body 8-1, a carbon dioxide pipeline 8-2 arranged on the box body 8-1 and connected to the outlet of the regulating valve 7, and a plurality of injection branches 8-5 connected to the carbon dioxide pipeline 8-2 and extending into the box body 8-1, and a heat transfer medium pipeline 8-4 running through the box body 8-1, the liquid inlet and the liquid outlet of the heat transfer medium pipeline 8-4 extend out of the box body 8-1, the liquid inlet of the heat transfer medium pipeline 8-4 is connected to the outlet of the second heat transfer medium tank 9-2, and the liquid outlet of the heat transfer medium pipeline 8-4 is connected to the inlet of the first heat transfer medium tank 9-1.

[0047] In this embodiment, the box 8-1 is connected to a carbon dioxide outlet pipe 8-7 and a clean gas pipeline 8-3;

[0048] The bottom of the injection branch pipe 8-5 is close to the heat transfer medium pipeline 8-4, and a nozzle 8-6 is provided at the bottom of the injection branch pipe 8-5.

[0049] In this embodiment, during specific implementation, the temperature of carbon dioxide in the high-temperature and high-pressure gas storage tank 1 is greater than 31.3° C., and the pressure is greater than 7.38 MPa.

[0050] In this embodiment, during specific implementation, a gas-liquid heat exchanger 2 is provided to cool the temperature of the carbon dioxide in the high-temperature and high-pressure gas storage tank 1 through a heat-conducting medium, and to reduce the pressure of the supercritical carbon dioxide through a throttle valve 3. The decompression is self-condensed into liquid carbon dioxide, and the carbon dioxide is transported to a liquid storage tank 4 for energy storage.

[0051] In this embodiment, during specific implementation, the carbon dioxide after passing through the energy release component 5 is low-temperature and low-pressure carbon dioxide gas, but there will be some incompletely gasified carbon dioxide liquid.

[0052] In this embodiment, during specific implementation, a regulating valve 7 is provided to control the flow rate of direct injection of carbon dioxide to achieve control of the cooling temperature.

[0053] In this embodiment, during specific implementation, the compressor 10 is connected to the outlet of the carbon dioxide outlet pipe 8-7 and is also connected to the high-temperature and high-pressure gas storage tank 1 to form a closed-loop system to achieve carbon dioxide recycling.

[0054] In this embodiment, during specific implementation, the heat transfer medium is normal pressure water or heat transfer oil.

[0055] In this embodiment, during specific implementation, the energy release component 5 can also be other equipment that requires liquid carbon dioxide refrigeration and temperature control.

[0056] In this embodiment, during specific implementation, the temperature of the carbon dioxide gas obtained after the energy release component 5 is used is very low, usually between -30°C and -50°C. These gases will usually continue to be used to maintain a low-temperature environment. When the temperature of the carbon dioxide gas rises to a temperature that does not meet the requirements, it will usually be heated and pressurized again to enter the next cycle. For this system, the cold capacity carried by the carbon dioxide after the temperature is increased is completely sufficient to cool the heat transfer medium. At the same time, the heat carried by the heat transfer medium can heat this part of the carbon dioxide before entering the next cycle, thereby improving energy utilization.

[0057] In this embodiment, during specific implementation, an injection branch pipe 8-5 and a heat transfer medium pipeline 8-4 are set. The injection branch pipe 8-5 is a gas pipeline, and the heat transfer medium pipeline 8-4 is a liquid pipeline. Heat exchange is transmitted through the air; the direct injection cooling part 8 adopts a carbon dioxide direct injection method, and the heat transfer medium channel is a liquid pipeline. The introduced carbon dioxide contacts the heat transfer medium pipeline for heat exchange.

[0058] The box 8-1 is provided with a well-sealed outer wall. At the same time, in order to ensure the safety of the direct injection method, when the carbon dioxide concentration inside the box 8-1 is too high or the temperature is too low, people should be restricted from approaching. At the same time, valves should be installed at the inlet and outlet of the box 8-1 to open or close according to the specific situation.

[0059] In this embodiment, during specific implementation, a connecting pipe 12 is further provided between the first heat transfer medium tank 9 - 1 and the second heat transfer medium tank 9 - 2 . A valve may be provided on the connecting pipe 12 to be opened or closed according to specific circumstances.

[0060] When the present invention is used, the first control valve 9-3 and the second control valve 9-4 are operated and opened, and the heat-conducting medium in the first heat-conducting medium tank 9-1 enters the gas-liquid heat exchanger 2 through the first control valve 9-3. At the same time, the carbon dioxide gas in the high-temperature and high-pressure gas storage tank 1 enters through the air inlet of the gas-liquid heat exchanger 2. The heat-conducting medium in the gas-liquid heat exchanger 2 cools the carbon dioxide gas and is discharged through the air outlet of the gas-liquid heat exchanger 2. The cooled carbon dioxide gas is then depressurized by the throttle valve 3. The supercritical carbon dioxide is self-condensed into liquid carbon dioxide and stored in the liquid storage tank 4. The liquid carbon dioxide in the liquid storage tank 4 is sent to the energy release component 5 for refrigeration and temperature control, and the gaseous carbon dioxide is output and enters the gas storage tank 6.

[0061] At the same time, the heat transfer medium in the gas-liquid heat exchanger 2 passes through the outlet of the gas-liquid heat exchanger 2 and the second control valve 9-4 and enters the second heat transfer medium tank 9-2 for recycling. The second temperature sensor 10 detects the temperature of the heat transfer medium in the second heat transfer medium tank 9-2. If the temperature of the second heat transfer medium tank 9-2 is not greater than the required value, the heat transfer medium in the second heat transfer medium tank 9-2 enters the first heat transfer medium tank 9-1 for recycling through the connecting pipe 12.

[0062] If the temperature of the second heat transfer medium tank 9-2 is greater than the required value, the third control valve 9-5 and the fourth control valve 9-6 are operated to open, and the gaseous carbon dioxide in the gas storage tank 6 enters the direct injection cooling component 8 through the regulating valve 7. At the same time, the heat transfer medium in the second heat transfer medium tank 9-2 enters through the liquid inlet of the direct injection cooling component 8, and the heat transfer medium is cooled by direct injection of gaseous carbon dioxide. The heat transfer medium after the cold zone enters the first heat transfer medium tank 9-1 through the liquid outlet of the direct injection cooling component 8 and the fourth control valve 9-6 for recycling, and the gaseous carbon dioxide at the outlet of the direct injection cooling component 8 is pressurized and heated by the compressor 10 until the required high-temperature and high-pressure gaseous carbon dioxide is obtained and input into the high-temperature and high-pressure gas storage tank 1 for storage, thereby realizing the recycling of carbon dioxide.

[0063] In summary, the utility model has a reasonable design and effectively utilizes the cooling capacity of the low-temperature carbon dioxide after energy release and the heat after heat exchange with the heat-conducting medium. It can not only cool the heat-conducting medium, but also heat the low-temperature carbon dioxide after energy release, thereby reducing the energy consumed in the subsequent evaporation and compression of the carbon dioxide and improving the system efficiency.

[0064] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A carbon dioxide circulation cooling system, characterized in that: The invention comprises a high-temperature and high-pressure gas storage tank (1), a gas-liquid heat exchanger (2), a throttle valve (3), a liquid storage tank (4), and an energy release component (5) connected in sequence, as well as a heat-conducting medium connected to the gas-liquid heat exchanger (2) and a carbon dioxide circulation cooling mechanism connected to the energy release component (5) and cooling the heat-conducting medium; The heat-conducting medium comprises a first heat-conducting medium tank (9-1) and a second heat-conducting medium tank (9-2), the outlet of the first heat-conducting medium tank (9-1) is connected to the liquid inlet of the gas-liquid heat exchanger (2), and the inlet of the second heat-conducting medium tank (9-2) is connected to the liquid outlet of the gas-liquid heat exchanger (2); The carbon dioxide circulation cooling mechanism comprises a gas storage tank (6), a regulating valve (7) and a direct injection cooling element (8) which are sequentially connected to the energy release component (5); the liquid inlet of the direct injection cooling element (8) is connected to the outlet of the second heat transfer medium tank (9-2); the liquid outlet of the direct injection cooling element (8) is connected to the inlet of the first heat transfer medium tank (9-1); and the air inlet of the direct injection cooling element (8) is connected to the outlet of the regulating valve (7).

2. A carbon dioxide circulation cooling system according to claim 1, characterized in that: The high-temperature and high-pressure gas storage tank (1) is connected to the air inlet of the gas-liquid heat exchanger (2), and the throttle valve (3) is connected to the air outlet of the gas-liquid heat exchanger (2); The air outlet of the direct injection cooling element (8) is connected to the inlet of the compressor (10), and the outlet of the compressor (10) is connected to the high-temperature and high-pressure gas storage tank (1).

3. A carbon dioxide circulation cooling system according to claim 1, characterized in that: A first control valve (9-3) is provided between the outlet of the first heat transfer medium tank (9-1) and the liquid inlet of the gas-liquid heat exchanger (2), and a second control valve (9-4) is provided between the inlet of the second heat transfer medium tank (9-2) and the gas-liquid heat exchanger (2); A third control valve (9-5) is provided between the liquid inlet of the direct-injection cooling element (8) and the outlet of the second heat-conducting medium tank (9-2), and a fourth control valve (9-6) is provided between the liquid outlet of the direct-injection cooling element (8) and the inlet of the first heat-conducting medium tank (9-1).

4. A carbon dioxide circulation cooling system according to claim 1, characterized in that: The first heat-conducting medium tank (9-1) is provided with a first temperature sensor (11), and the second heat-conducting medium tank (9-2) is provided with a second temperature sensor (13).

5. A carbon dioxide circulation cooling system according to claim 1, characterized in that: The energy release component (5) is a carbon dioxide ice maker.

6. A carbon dioxide circulation cooling system according to claim 1, characterized in that: The direct injection cooling element (8) includes a housing (8-1), a carbon dioxide pipeline (8-2) arranged on the housing (8-1) and connected to the outlet of the regulating valve (7), and a plurality of injection branches (8-5) connected to the carbon dioxide pipeline (8-2) and extending into the housing (8-1), and a heat transfer medium pipeline (8-4) running through the housing (8-1), wherein the liquid inlet and the liquid outlet of the heat transfer medium pipeline (8-4) extend out of the housing (8-1), the liquid inlet of the heat transfer medium pipeline (8-4) is connected to the outlet of the second heat transfer medium tank (9-2), and the liquid outlet of the heat transfer medium pipeline (8-4) is connected to the inlet of the first heat transfer medium tank (9-1).

7. A carbon dioxide circulation cooling system according to claim 6, characterized in that: The box (8-1) is connected to a carbon dioxide outlet pipe (8-7) and a clean gas pipeline (8-3); The bottom of the injection branch pipe (8-5) is close to the heat-conducting medium pipeline (8-4), and a nozzle (8-6) is provided at the bottom of the injection branch pipe (8-5).

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