Carbon dioxide-alcohol hybrid energy storage device and method of use thereof

Abstract

This invention relates to the field of physical energy storage technology, providing a carbon dioxide-ethanol mixed energy storage device and its usage method. The device includes: a carbon dioxide cylinder; a carbon dioxide filling component for filling the cylinder with carbon dioxide, forming liquid carbon dioxide within the cylinder; a carbon dioxide releasing component for releasing the gaseous carbon dioxide generated in the cylinder; and an alcohol circulation heating and cooling structure disposed around the carbon dioxide cylinder. When carbon dioxide is being filled, the alcohol circulation heating and cooling structure provides liquid alcohol to cool the cylinder, liquefying the gaseous carbon dioxide into liquid carbon dioxide. During this process, the liquid alcohol absorbs heat to form gaseous alcohol. When carbon dioxide needs to be released, the alcohol circulation heating and cooling structure heats the carbon dioxide cylinder with the formed gaseous alcohol, vaporizing the liquid carbon dioxide into gaseous carbon dioxide. During this process, the gaseous alcohol releases heat to form liquid alcohol. This invention effectively saves energy and ensures efficiency.

Description

Technical Field

[0001] This invention relates to the field of physical energy storage technology, and in particular to a carbon dioxide-ethanol mixed energy storage device and its usage method. Background Technology

[0002] Current research on compressed gas energy storage devices mainly focuses on large-volume devices that store energy through large gas tanks. Although the gas pressure inside the tanks is high, the compression of the gas has not progressed to the point of gas liquefaction.

[0003] Because most current designs use large gas tanks that store gas, the filling and defilling processes only consider how to safely and efficiently achieve filling and defilling. Traditional solutions do not address how to achieve step-by-step compression and release of gas pressure or how to improve the accuracy and timeliness of heat regulation in the energy cycle. This results in traditional solutions being unable to miniaturize the gas tanks, reduce the overall size of the energy storage system, and have high requirements for application scenarios. Furthermore, traditional solutions cannot quickly and accurately replenish heat through electric heating when the system loses energy, leading to operational difficulties and low efficiency in energy storage power generation. Summary of the Invention

[0004] The purpose of this invention is to solve at least one technical problem in the background art and to provide a carbon dioxide-ethanol mixed energy storage device and its usage method.

[0005] To achieve the above objectives, the present invention provides a carbon dioxide-ethanol mixed energy storage device, comprising:

[0006] Carbon dioxide cylinders;

[0007] A carbon dioxide filling assembly is connected to the carbon dioxide cylinder, fills the carbon dioxide cylinder with carbon dioxide, and forms liquid carbon dioxide in the carbon dioxide cylinder.

[0008] A carbon dioxide venting assembly is connected to the carbon dioxide cylinder to release the gaseous carbon dioxide generated in the carbon dioxide cylinder.

[0009] An alcohol circulation heating and cooling structure is installed around the carbon dioxide cylinder. When the carbon dioxide cylinder is filled with carbon dioxide gas, the alcohol circulation heating and cooling structure provides liquid alcohol to cool the carbon dioxide cylinder, liquefying the gaseous carbon dioxide in the carbon dioxide cylinder into liquid carbon dioxide. During the liquefaction process, the liquid alcohol absorbs heat to form gaseous alcohol.

[0010] When the carbon dioxide cylinder releases carbon dioxide gas, the alcohol circulation heating and cooling structure heats the carbon dioxide cylinder with the gaseous alcohol, vaporizing the liquid carbon dioxide in the carbon dioxide cylinder to form gaseous carbon dioxide. During the vaporization of carbon dioxide, the gaseous alcohol releases heat to form liquid alcohol.

[0011] According to one aspect of the invention, it further includes: an electric heater disposed around the periphery of the carbon dioxide cylinder to provide the necessary heat when the carbon dioxide cylinder releases gaseous carbon dioxide.

[0012] According to one aspect of the present invention, the carbon dioxide inflation assembly includes: an inflation pipeline and an inflation pump, a first check valve, a first flow meter and a first gas tank connected in sequence to the inflation pipeline.

[0013] According to one aspect of the present invention, the carbon dioxide venting assembly includes: a venting pipeline and a pressure gauge, a solenoid valve, a second check valve, a second flow meter, and a second gas tank connected in sequence to the venting pipeline.

[0014] According to one aspect of the present invention, the alcohol circulating heating and cooling structure includes:

[0015] A heat exchange copper tube is installed around the carbon dioxide cylinder;

[0016] The input tube has one end connected to the input end of the heat exchange copper tube;

[0017] A gaseous alcohol delivery tube, one end of which is connected to the other end of the input tube;

[0018] A liquid alcohol delivery tube, one end of which is connected to the other end of the input tube;

[0019] A third check valve is installed on the gaseous alcohol delivery pipe;

[0020] A gas cylinder is located at the other end of the gaseous alcohol delivery pipe to supply gaseous alcohol.

[0021] The fourth check valve is installed on the liquid alcohol delivery pipe;

[0022] A liquid tank is located at the other end of the liquid alcohol delivery pipe to supply liquid alcohol;

[0023] One end of the output tube is connected to the output end of the heat exchange copper tube;

[0024] A suction pump, installed on the output pipe, pumps out the alcohol from the heat exchange copper pipe;

[0025] A gas-liquid separation device is installed on the output pipe downstream of the suction pump to separate gaseous alcohol and liquid alcohol and deliver them to the gas tank and the liquid tank respectively.

[0026] To achieve the above objectives, the present invention also provides a method of using a carbon dioxide-ethanol mixed energy storage device, comprising:

[0027] Gaseous carbon dioxide is filled into the carbon dioxide cylinder using a carbon dioxide filling assembly.

[0028] Liquid alcohol is supplied to the periphery of the carbon dioxide cylinder through an alcohol circulation heating and cooling structure. The liquid alcohol absorbs heat to cool the carbon dioxide cylinder, thus cooling the gaseous carbon dioxide in the cylinder to form liquid carbon dioxide. During this process, some of the alcohol absorbs heat to form gaseous alcohol.

[0029] When it is necessary to release gaseous carbon dioxide from the carbon dioxide cylinder through the carbon dioxide venting component to generate electricity, the gaseous alcohol formed by the alcohol circulation heating and cooling structure heats the carbon dioxide cylinder, vaporizing the liquid carbon dioxide in the carbon dioxide cylinder into gaseous carbon dioxide. Then, the gaseous carbon dioxide formed by the carbon dioxide venting component is released to drive the generator to generate electricity. During the vaporization of carbon dioxide, the gaseous alcohol releases heat to form liquid alcohol.

[0030] According to one aspect of the invention, it further includes: supplementing the heat required when releasing gaseous carbon dioxide from the carbon dioxide cylinder via an electric heater.

[0031] According to one aspect of the invention, the electric heater provides the heat required when a carbon dioxide cylinder releases gaseous carbon dioxide, comprising:

[0032] Open the valve on the carbon dioxide cylinder nozzle. If the cylinder nozzle pressure is lower than the pressure value for driving the generator, it is necessary to determine whether the carbon dioxide cylinder is about to run out of gas. If there is gas, it means that the low pressure is due to low temperature. In this case, start the electric heater to heat the cylinder and continue to monitor the pressure until the pressure reaches a level sufficient to drive the generator.

[0033] At this point, heating is stopped to stabilize the gas pressure, and the pressure is monitored cyclically. If the pressure is lower than the pressure value for driving the generator, heating is restarted until the gas supply decreases to such a low level that the gas pressure remains lower than the pressure value for driving the generator even with continuous heating. At this point, the electric heater is kept in heating mode until the net weight of the remaining carbon dioxide in the cylinder is less than the preset value of the exhaust gas. If there is flow at the cylinder opening, heating will continue until the flow rate is 0. At this point, all liquid carbon dioxide has been vaporized and can no longer be released, and the electric heating ends.

[0034] According to one aspect of the present invention, a carbon dioxide-ethanol mixed energy storage device includes: a carbon dioxide cylinder; a carbon dioxide filling assembly connected to the carbon dioxide cylinder to fill the cylinder with carbon dioxide and form liquid carbon dioxide in the cylinder; a carbon dioxide venting assembly connected to the carbon dioxide cylinder to release the gaseous carbon dioxide generated in the cylinder; and an alcohol circulation heating and cooling structure disposed around the carbon dioxide cylinder. When the carbon dioxide cylinder is filled with carbon dioxide gas, the alcohol circulation heating and cooling structure provides liquid alcohol to cool the cylinder, liquefying the gaseous carbon dioxide in the cylinder into liquid carbon dioxide. During the liquefaction process, the liquid alcohol absorbs heat to form gaseous alcohol. When the carbon dioxide cylinder releases carbon dioxide gas, the alcohol circulation heating and cooling structure heats the cylinder with the formed gaseous alcohol, vaporizing the liquid carbon dioxide in the cylinder into gaseous carbon dioxide. During the vaporization process, the gaseous alcohol releases heat to form liquid alcohol. This configuration allows the alcohol to be supplied in different states during the filling and releasing of carbon dioxide from the cylinder via a circulating heating and cooling structure. This helps the cylinder rapidly cool the carbon dioxide into a liquid state during filling and rapidly heat it into a gaseous state during releasing to drive the generator. Furthermore, during filling and releasing, the alcohol undergoes state transformation due to heat absorption and release, and the transformed alcohol can be recycled. Therefore, energy is effectively saved during carbon dioxide filling and releasing, and the endothermic and exothermic effects of the alcohol are utilized efficiently, improving energy efficiency.

[0035] According to one aspect of the present invention, the invention further includes an electric heater disposed around the periphery of the carbon dioxide cylinder to supplement the heat required when the carbon dioxide cylinder releases gaseous carbon dioxide. With this configuration, since system energy is lost, relying solely on the heat absorption and release of alcohol would affect system operating efficiency. Therefore, the present invention supplements the heating by incorporating an electric heater, ensuring that the carbon dioxide cylinder receives additional heat when releasing gaseous carbon dioxide, thus guaranteeing the flow rate and pressure of carbon dioxide and ensuring the normal operation of the system.

[0036] According to one aspect of the present invention, the alcohol circulation heating and cooling structure includes: a heat exchange copper tube disposed around a carbon dioxide cylinder; an input pipe, one end of which is connected to the input end of the heat exchange copper tube; a gaseous alcohol conveying pipe, one end of which is connected to the other end of the input pipe; a liquid alcohol conveying pipe, one end of which is connected to the other end of the input pipe; a third check valve disposed on the gaseous alcohol conveying pipe; a gas tank disposed on the other end of the gaseous alcohol conveying pipe for supplying gaseous alcohol; a fourth check valve disposed on the liquid alcohol conveying pipe; a liquid tank disposed on the other end of the liquid alcohol conveying pipe for supplying liquid alcohol; an output pipe, one end of which is connected to the output end of the heat exchange copper tube; a suction pump disposed on the output pipe for pumping out alcohol from the heat exchange copper tube; and a gas-liquid separation device disposed on the output pipe downstream of the suction pump for separating gaseous alcohol and liquid alcohol and conveying them to the gas tank and liquid tank respectively. This setup allows for the following: When the carbon dioxide cylinder is being filled, liquid alcohol is supplied to the heat exchange copper tubes via a liquid tank, liquid alcohol delivery pipe, and input pipe. The liquid alcohol absorbs heat, cooling the gaseous carbon dioxide in the cylinder to form liquid carbon dioxide. The alcohol then absorbs heat, creating a gas-liquid mixture. This mixture is then separated by a gas-liquid separator and stored in separate gas and liquid tanks. Similarly, when the carbon dioxide cylinder is being released, gaseous alcohol is supplied to the heat exchange copper tubes via a gas tank, gaseous alcohol delivery pipe, and input pipe. The gaseous alcohol releases heat, heating the liquid carbon dioxide in the cylinder to form gaseous carbon dioxide, which is then released. The alcohol then releases heat, again creating a gas-liquid mixture. This mixture is then separated by a gas-liquid separator and stored in separate gas and liquid tanks. This cycle repeats continuously, allowing for the reuse of alcohol for heating and cooling, effectively saving energy and improving system operability and controllability.

[0037] According to the solution of the present invention, the present invention can achieve the following beneficial effects:

[0038] This invention effectively reduces the size of the carbon dioxide cylinder and the overall energy storage device by forming liquid carbon dioxide from carbon dioxide gas under high pressure. Moreover, in order to solve the problem of significantly reduced energy conversion efficiency caused by large changes in gas pressure, a thermoelectric heat exchange system was designed based on the miniaturized carbon dioxide cylinder. Through the heat exchange effect of alcohol and intelligent energy-saving electric heating compensation design, the energy storage efficiency problem of small high-pressure energy storage devices is significantly solved.

[0039] This invention can minimize energy loss in high-voltage energy storage systems and improve energy exchange efficiency. By using an intelligent electric heating system, it can solve the problem of system cycle interruption in extreme environments while saving energy. Furthermore, by adjusting the parameters of the heating program, the efficiency of the entire system can be optimized under different natural environments. Attached Figure Description

[0040] Figure 1 This schematic diagram illustrates the structural layout of a carbon dioxide-ethanol mixed energy storage device according to one embodiment of the present invention.

[0041] Figure 2 The diagram illustrates the heating logic block diagram of an electric heater according to one embodiment of the present invention. Detailed Implementation

[0042] The invention will now be discussed with reference to exemplary embodiments. It should be understood that the described embodiments are merely intended to enable those skilled in the art to better understand and thus implement the invention, and are not intended to imply any limitation on the scope of the invention.

[0043] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment".

[0044] Figure 1 This schematic diagram illustrates the structural layout of a carbon dioxide-ethanol mixed energy storage device according to one embodiment of the present invention. Figure 1 As shown, in this embodiment, the carbon dioxide-ethanol mixed energy storage device includes:

[0045] Carbon dioxide cylinder 1;

[0046] The carbon dioxide filling component 2 is connected to the carbon dioxide cylinder 1, fills the carbon dioxide cylinder 1 with carbon dioxide, and forms liquid carbon dioxide in the carbon dioxide cylinder 1.

[0047] The carbon dioxide venting component 3 is connected to the carbon dioxide cylinder 1 and releases the gaseous carbon dioxide generated in the carbon dioxide cylinder 1.

[0048] An alcohol circulation heating and cooling structure 4 is set around the carbon dioxide cylinder 1. When the carbon dioxide cylinder 1 is filled with carbon dioxide gas, the alcohol circulation heating and cooling structure 4 provides liquid alcohol to cool the carbon dioxide cylinder 1, liquefying the gaseous carbon dioxide in the carbon dioxide cylinder 1 into liquid carbon dioxide. During the liquefaction process, the liquid alcohol absorbs heat to form gaseous alcohol.

[0049] When the carbon dioxide cylinder 1 releases carbon dioxide gas, the alcohol circulation heating and cooling structure 4 heats the carbon dioxide cylinder 1 with the resulting gaseous alcohol, vaporizing the liquid carbon dioxide in the cylinder 1. During the vaporization process, the gaseous alcohol releases heat, forming liquid alcohol. This configuration allows the alcohol circulation heating and cooling structure 4 to provide alcohol in different states during the filling and releasing of carbon dioxide gas in the carbon dioxide cylinder 1. This helps the cylinder 1 quickly cool the carbon dioxide to a liquid state during filling and quickly heat the carbon dioxide to a gaseous state during releasing, driving the generator to generate electricity. Furthermore, during filling and releasing, the alcohol undergoes state transformation due to heat absorption and release. The alcohol in the transformed state can be recycled, thus effectively saving energy during carbon dioxide filling and releasing, efficiently utilizing the heat absorption and release of alcohol, and improving energy efficiency.

[0050] Furthermore, such as Figure 1 As shown, in this embodiment, the invention further includes an electric heater 5, disposed around the periphery of the carbon dioxide cylinder 1, to supplement the heat required when the carbon dioxide cylinder 1 releases gaseous carbon dioxide. This arrangement is necessary because system energy loss occurs, and relying solely on the heat absorption and release of alcohol would affect system efficiency. Therefore, the invention supplements heating by using the electric heater 5, ensuring that the carbon dioxide cylinder 1 receives additional heat when releasing gaseous carbon dioxide, thus maintaining the flow rate and pressure of carbon dioxide and guaranteeing the normal operation of the system.

[0051] Furthermore, in this embodiment, the present invention also includes: a weighing meter 28, which is installed at the bottom of the carbon dioxide cylinder 1 to monitor the weight of the carbon dioxide cylinder 1 and ensure that the weight of the carbon dioxide cylinder 1 and the carbon dioxide inside it is within the normal range.

[0052] Furthermore, such as Figure 1 As shown, in this embodiment, the carbon dioxide filling assembly 2 includes: a filling pipeline 6 and a filling pump 7, a first check valve 8, a first flow meter 9, and a first gas tank 10 connected in sequence to the filling pipeline 6. This configuration allows carbon dioxide gas to be supplied through the first gas tank 10, the flow rate of carbon dioxide to be monitored by the first flow meter 9, and the backflow of gas to be prevented by the first check valve 8, ensuring a safe, stable, and controllable process for filling carbon dioxide gas.

[0053] Furthermore, such as Figure 1As shown, in this embodiment, the carbon dioxide venting assembly 3 includes: a venting pipeline 11 and a pressure gauge 12, a solenoid valve 13, a second check valve 14, a second flow meter 15, and a second gas tank 16 connected in sequence to the venting pipeline 11. This configuration allows the solenoid valve 13 to control the emission output of gas from the carbon dioxide cylinder 1, the pressure gauge 12 to monitor whether the pressure of the emitted carbon dioxide gas meets the power generation standards, the second check valve 14 to prevent gas backflow, the second flow meter 15 to monitor the flow rate of carbon dioxide, and finally, the second gas tank 16 to store the gaseous carbon dioxide emitted after power generation.

[0054] In this embodiment, the gaseous carbon dioxide through the second flow meter 15 can drive the generator to generate electricity.

[0055] Furthermore, such as Figure 1 As shown, in this embodiment, the alcohol circulation heating and cooling structure 4 includes:

[0056] The heat exchange copper tube 17 is installed around the carbon dioxide cylinder 1;

[0057] One end of the input tube 18 is connected to the input end of the heat exchange copper tube 17;

[0058] One end of the gaseous alcohol delivery tube 19 is connected to the other end of the input tube 18;

[0059] One end of the liquid alcohol delivery tube 20 is connected to the other end of the input tube 18;

[0060] The third check valve 21 is installed on the gaseous alcohol delivery pipe 19;

[0061] Gas tank 22 is located at the other end of gaseous alcohol delivery pipe 19 to supply gaseous alcohol;

[0062] The fourth check valve 23 is installed on the liquid alcohol delivery pipe 20;

[0063] Liquid tank 24 is located at the other end of liquid alcohol delivery pipe 20 to supply liquid alcohol;

[0064] One end of the output tube 25 is connected to the output end of the heat exchange copper tube 17;

[0065] A suction pump 26 is installed on the output pipe 25 to pump out the alcohol in the heat exchange copper pipe 17.

[0066] A gas-liquid separator 27, located on the output pipe 25 downstream of the suction pump 26, separates gaseous and liquid alcohol and delivers them to the gas tank 22 and liquid tank 24 respectively. This arrangement allows liquid alcohol to be supplied to the heat exchange copper pipe 17 via the liquid tank 24, liquid alcohol delivery pipe 20, and input pipe 18 while the carbon dioxide cylinder 1 is being filled. The liquid alcohol absorbs heat, cooling the gaseous carbon dioxide in the carbon dioxide cylinder 1 to form liquid carbon dioxide. Simultaneously, the alcohol absorbs heat, forming a gas-liquid mixture. This mixture is then separated by the gas-liquid separator 27 and stored in the gas tank 22 and liquid tank 24 respectively. When the carbon dioxide cylinder 1 is being vented, the liquid alcohol is released through the gas tank 22... Gaseous alcohol is delivered into the heat exchange copper pipe 17 via the gaseous alcohol delivery pipe 19 and the input pipe 18. After the gaseous alcohol releases heat, it heats the liquid carbon dioxide in the carbon dioxide cylinder 1 to form gaseous carbon dioxide, which is then released. At this time, the alcohol releases heat and forms a mixture of gas and liquid. The mixture of gas and liquid is separated by the gas-liquid separation device 27 and stored in the gas tank 22 and the liquid tank 24 respectively. This cycle is repeated, and the alcohol can be reused for heating and cooling, effectively saving energy and improving the operability and controllability of the system.

[0067] Furthermore, to achieve the above objectives, the present invention also provides a method of using a carbon dioxide-ethanol mixed energy storage device, comprising:

[0068] Gaseous carbon dioxide is filled into carbon dioxide cylinder 1 through carbon dioxide filling component 2;

[0069] Liquid alcohol is supplied to the periphery of carbon dioxide cylinder 1 through the alcohol circulation heating and cooling structure 4. The liquid alcohol absorbs heat to cool carbon dioxide cylinder 1, thereby cooling the gaseous carbon dioxide in carbon dioxide cylinder 1 to form liquid carbon dioxide. During this process, some alcohol absorbs heat to form gaseous alcohol.

[0070] When gaseous carbon dioxide from carbon dioxide cylinder 1 needs to be released through the carbon dioxide venting assembly 3 to generate electricity, the gaseous alcohol formed by the alcohol circulation heating and cooling structure 4 heats carbon dioxide cylinder 1, vaporizing the liquid carbon dioxide in cylinder 1. This gaseous carbon dioxide is then released through the carbon dioxide venting assembly 3 to drive the generator. During the vaporization of carbon dioxide, the gaseous alcohol releases heat, forming liquid alcohol. This configuration allows the alcohol circulation heating and cooling structure 4 to provide alcohol in different states during the filling and releasing of carbon dioxide gas from cylinder 1. This helps to quickly cool the carbon dioxide to a liquid state during filling and quickly heat it to a gaseous state during releasing to drive the generator. Furthermore, during filling and releasing, the alcohol undergoes state transformation due to heat absorption and release. The transformed alcohol can be recycled, thus effectively saving energy during carbon dioxide filling and releasing, efficiently utilizing the heat absorption and release of alcohol, and improving energy efficiency.

[0071] Furthermore, in this embodiment, the present invention also includes: supplementing the heat required when the carbon dioxide cylinder 1 releases gaseous carbon dioxide through the electric heater 5.

[0072] In this embodiment, such as Figure 2 As shown, the electric heater 5 provides the heat required when the carbon dioxide cylinder 1 releases gaseous carbon dioxide. The specific method includes:

[0073] Open the valve (i.e., solenoid valve 13) on the cylinder head of carbon dioxide cylinder 1. If the cylinder head pressure is lower than the pressure value required to drive the generator (e.g., <1mp), it is necessary to determine whether carbon dioxide cylinder 1 is about to run out of gas (no pressure does not mean no gas; it may be that the temperature is too low and the liquid CO2 cannot be vaporized smoothly). If there is gas (tare net weight >2kg), it means that the low pressure is due to the low temperature. Then, start the electric heater 5 to heat the cylinder and continue to monitor the pressure until the pressure reaches a level sufficient to drive the generator (e.g., 1mp; the value of 1mp can vary depending on the stable gas release pressure required by the generator).

[0074] At this point, heating is stopped to stabilize the gas pressure (to prevent the gas pressure and flow rate from continuing to rise), and the pressure is monitored cyclically. If the pressure is lower than the pressure value that drives the generator (e.g., 1 MPa), heating is restarted until the gas supply decreases to such a low level that the gas pressure remains lower than the pressure value that drives the generator even with continuous heating. At this point, the electric heater 5 is kept in heating mode until the remaining net weight of the carbon dioxide cylinder 1 is less than the preset value (e.g., <2 kg). If there is a flow at the cylinder opening (indicating that gas is still being released), heating will continue until the flow rate = 0. At this point, all liquid carbon dioxide has been vaporized and can no longer be released, and the electric heating ends.

[0075] In this embodiment, the entire heating process actually occurs in the latter half of the process after the alcohol gas is heated by the heat exchange copper tube and after the alcohol gas is exhausted (completely condensed and liquefied). (The alcohol gas is not unlimited; the total amount of alcohol gas depends on the heat released during the previous energy storage, which was absorbed by the liquid alcohol used for cooling and turned into alcohol gas, which is stored in an insulated gas tank.)

[0076] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A carbon dioxide-ethanol mixed energy storage device, characterized in that, include: Carbon dioxide cylinder (1); A carbon dioxide filling component (2) is connected to the carbon dioxide cylinder (1) to fill the carbon dioxide cylinder (1) with gaseous carbon dioxide and form liquid carbon dioxide in the carbon dioxide cylinder (1); The carbon dioxide venting assembly (3) is connected to the carbon dioxide cylinder (1) to release the gaseous carbon dioxide generated in the carbon dioxide cylinder (1); An alcohol circulation heating and cooling structure (4) is set around the carbon dioxide cylinder (1). When the carbon dioxide cylinder (1) is filled with carbon dioxide gas, the alcohol circulation heating and cooling structure (4) provides liquid alcohol to cool the carbon dioxide cylinder (1) and liquefies the gaseous carbon dioxide in the carbon dioxide cylinder (1) into liquid carbon dioxide. During the liquefaction of carbon dioxide, the liquid alcohol absorbs heat to form gaseous alcohol. When the carbon dioxide cylinder (1) releases carbon dioxide gas, the alcohol circulation heating and cooling structure (4) heats the carbon dioxide cylinder (1) with the gaseous alcohol formed, and vaporizes the liquid carbon dioxide in the carbon dioxide cylinder (1) to form gaseous carbon dioxide. During the vaporization of carbon dioxide, the gaseous alcohol releases heat to form liquid alcohol. It also includes: an electric heater (5), which is disposed around the carbon dioxide cylinder (1) to provide the heat required when the carbon dioxide cylinder (1) releases gaseous carbon dioxide; The carbon dioxide inflation assembly (2) includes: an inflation pipeline (6) and an inflation pump (7), a first check valve (8), a first flow meter (9) and a first air tank (10) connected in sequence to the inflation pipeline (6); The alcohol circulation heating and cooling structure (4) includes: A heat exchange copper tube (17) is disposed around the carbon dioxide cylinder (1); The input tube (18) is connected at one end to the input end of the heat exchange copper tube (17); A gaseous alcohol delivery tube (19) is connected at one end to the other end of the input tube (18); One end of the liquid alcohol delivery tube (20) is connected to the other end of the input tube (18); A third check valve (21) is installed on the gaseous alcohol delivery pipe (19); A gas cylinder (22) is provided at the other end of the gaseous alcohol delivery pipe (19) to supply gaseous alcohol; A fourth check valve (23) is installed on the liquid alcohol delivery pipe (20); A liquid tank (24) is provided at the other end of the liquid alcohol delivery pipe (20) to supply liquid alcohol; One end of the output tube (25) is connected to the output end of the heat exchange copper tube (17); A suction pump (26) is installed on the output pipe (25) to pump out alcohol from the heat exchange copper pipe (17); A gas-liquid separation device (27) is installed on the output pipe (25) downstream of the suction pump (26) to separate gaseous alcohol and liquid alcohol and deliver them to the gas tank (22) and the liquid tank (24) respectively.

2. The carbon dioxide-ethanol mixed energy storage device according to claim 1, characterized in that, The carbon dioxide venting assembly (3) includes: a venting pipeline (11) and a pressure gauge (12), a solenoid valve (13), a second check valve (14), a second flow meter (15), and a second gas tank (16) connected in sequence to the venting pipeline (11).

3. The method of using the carbon dioxide-ethanol mixed energy storage device according to claim 1 or 2, characterized in that, include: Gaseous carbon dioxide is filled into the carbon dioxide cylinder (1) through the carbon dioxide filling component (2); Liquid alcohol is supplied to the periphery of the carbon dioxide cylinder (1) through the alcohol circulation heating and cooling structure (4). The liquid alcohol absorbs heat to cool the carbon dioxide cylinder (1), thereby cooling the gaseous carbon dioxide in the carbon dioxide cylinder (1) to form liquid carbon dioxide. During this process, some alcohol absorbs heat to form gaseous alcohol. When it is necessary to release gaseous carbon dioxide from carbon dioxide cylinder (1) through carbon dioxide venting assembly (3) to generate electricity, the gaseous alcohol formed is heated by alcohol circulation heating and cooling structure (4) to heat carbon dioxide cylinder (1), vaporizing liquid carbon dioxide in carbon dioxide cylinder (1) to form gaseous carbon dioxide. Then, the gaseous carbon dioxide formed is released through carbon dioxide venting assembly (3) to drive generator to generate electricity. During the process of vaporizing carbon dioxide, gaseous alcohol releases heat to form liquid alcohol.

4. The method of using the carbon dioxide-ethanol mixed energy storage device according to claim 3, characterized in that, Also includes: The electric heater (5) provides the heat required to release gaseous carbon dioxide from the carbon dioxide cylinder (1).

5. The method of using the carbon dioxide-ethanol mixed energy storage device according to claim 4, characterized in that, The electric heater (5) provides the heat required when the carbon dioxide cylinder (1) releases gaseous carbon dioxide, including: Open the valve of the cylinder mouth pipeline of carbon dioxide cylinder (1). If the cylinder mouth pressure is lower than the pressure value for driving the generator to generate electricity, it is necessary to determine whether the carbon dioxide cylinder (1) is about to run out of gas. If there is gas, it means that the low pressure is due to low temperature. Then start the electric heater (5) to heat it and continue to monitor the pressure until the pressure reaches a level sufficient to drive the generator to generate electricity. At this time, heating is stopped to stabilize the gas pressure, and the pressure is checked cyclically. If the pressure is lower than the pressure value of the generator, heating is restarted until the gas supply decreases to the point that the gas pressure is always lower than the pressure value of the generator even if heating continues. At this time, the electric heater (5) is kept in the heating state until the remaining net weight of the carbon dioxide cylinder (1) is less than the preset value of the tail gas. If there is flow at the cylinder opening, heating will continue until the flow rate = 0. At this time, all liquid carbon dioxide has been vaporized and can no longer be released, so the electric heating ends.

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