An intermittent compression system, control method and system controller

Abstract

The present invention provides an intermittent compression system, a control method and a system controller, which can reduce energy consumption costs and carbon emissions. The intermittent compression system includes: a first compression device, which is used to compress carbon dioxide gas; a first intermediate energy storage mechanism, the inlet of which is connected to the first outlet of the first compression device; a second intermediate energy storage mechanism, the inlet of which is connected to the outlet of the first intermediate energy storage mechanism; and a dry ice making mechanism, the inlet of which is connected to the second outlet of the first compression device and the outlet of the second intermediate energy storage mechanism.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to an intermittent compression system, a control method and a system controller. Background Art

[0002] Since carbon dioxide causes global warming, the world is vigorously developing carbon dioxide capture, utilization and storage to achieve large-scale greenhouse gas emission reduction. Carbon dioxide can be directly used as a product and has a wide range of uses in industrial production and residents' lives. Therefore, the resource utilization and storage of carbon dioxide are of great significance. In various carbon dioxide capture, utilization and storage processes, the compression process of carbon dioxide is generally involved. For example, the process of making dry ice from carbon dioxide gas is to first compress carbon dioxide to liquefy it, and then pass it through a dry ice machine using a throttling expansion process. The compression process of carbon dioxide is the main energy-consuming link, with a high proportion of energy consumption costs and a carbon footprint. Summary of the invention

[0003] In view of this, embodiments of the present invention are directed to providing an intermittent compression system, a control method, and a system controller, which can reduce energy consumption costs and reduce carbon emissions.

[0004] According to one aspect of the present invention, an intermittent compression system provided by an embodiment of the present invention includes: a first compression device, the first compression device is used to compress carbon dioxide gas; a first intermediate energy storage mechanism, the inlet of the first intermediate energy storage mechanism is connected to the first outlet of the first compression device, and the first intermediate energy storage mechanism is configured to convert the carbon dioxide gas compressed by the first compression device into a liquid in a thermodynamic state at a gas-liquid-solid coexistence point and store it; a second intermediate energy storage mechanism, the inlet of the second intermediate energy storage mechanism is connected to the outlet of the first intermediate energy storage mechanism, and the second intermediate energy storage mechanism is configured to compress the carbon dioxide gas output by the first intermediate energy storage mechanism and convert it into liquefied carbon dioxide at a higher pressure, and store the liquefied carbon dioxide; a dry ice making mechanism, the inlet of the dry ice making mechanism is respectively connected to the second outlet of the first compression device and the outlet of the second intermediate energy storage mechanism, and the dry ice making mechanism is configured to make dry ice from the carbon dioxide gas compressed by the first compression device.

[0005] In one embodiment, the first intermediate energy storage mechanism includes: a first storage tank, the first storage tank is used to store carbon dioxide, the carbon dioxide in the first storage tank is in a thermodynamic state of a gas-liquid-solid coexistence point, the inlet of the first storage tank is connected to the first outlet of the first compression device, and the first storage tank is configured to convert the carbon dioxide gas compressed by the first compression device into a liquid in a thermodynamic state of a gas-liquid-solid coexistence point and store it; wherein the inlet of the first storage tank is the inlet of the first intermediate energy storage mechanism, and the outlet of the first storage tank is the outlet of the first intermediate energy storage mechanism.

[0006] In one embodiment, the second intermediate energy storage mechanism includes: a first liquefaction compression device, the inlet of the first liquefaction compression device is connected to the outlet of the first storage tank, the first liquefaction compression device is configured to compress the carbon dioxide gas output from the first storage tank and convert it into liquefied carbon dioxide of higher pressure; a second storage tank, the inlet of the second storage tank is connected to the outlet of the first liquefaction compression device, the outlet of the second storage tank is connected to the dry ice making mechanism, and the second storage tank is configured to store liquid carbon dioxide compressed and liquefied by the first liquefaction compression device; wherein the carbon dioxide stored in the second storage tank is in a thermodynamic state of liquid phase, the inlet of the first liquefaction compression device is the inlet of the second intermediate energy storage mechanism, and the outlet of the second storage tank is the outlet of the second intermediate energy storage mechanism.

[0007] In one embodiment, the first liquefaction and compression device includes: a first compression component, the inlet of the first compression component is connected to the outlet of the first storage tank, and the first compression component is configured to pressurize the carbon dioxide gas output from the first storage tank to a liquefaction pressure; a first liquefaction component, the inlet of the first liquefaction component is connected to the outlet of the first compression component, and the outlet of the first liquefaction component is connected to the inlet of the second storage tank, and the first liquefaction component is configured to condense the carbon dioxide pressurized by the first compression component into a liquid; wherein the inlet of the first compression component is the inlet of the first liquefaction and compression device, and the outlet of the first liquefaction component is the outlet of the first liquefaction and compression device.

[0008] In one embodiment, the dry ice making mechanism includes: a second liquefaction and compression device, wherein the inlet of the second liquefaction and compression device is connected to the second outlet of the first compression device, and the second liquefaction and compression device is configured to compress and liquefy the carbon dioxide gas compressed by the first compression device into liquefied carbon dioxide; a dry ice machine, wherein the first inlet of the dry ice machine is connected to the outlet of the second liquefaction and compression device, and the second inlet of the dry ice machine is connected to the outlet of the second intermediate energy storage mechanism, and the dry ice machine is configured to make dry ice from the liquefied carbon dioxide liquefied and compressed by the second liquefaction and compression device, and to make dry ice from the liquefied carbon dioxide output by the second intermediate energy storage mechanism; wherein the second inlet of the dry ice machine is one of the inlets of the dry ice making mechanism, and the inlet of the second liquefaction and compression device is the other inlet of the dry ice making mechanism.

[0009] In one embodiment, the second liquefaction compression device includes: a second compression assembly, the inlet of the second compression assembly is connected to the second outlet of the first compression device, and the second compression assembly is configured to pressurize the carbon dioxide raw gas compressed by the first compression device to a liquefaction pressure; a second liquefaction assembly, the inlet of the second liquefaction assembly is connected to the outlet of the second compression assembly, and the second liquefaction assembly is configured to condense the carbon dioxide pressurized by the second compression assembly into a liquid; wherein the inlet of the second compression assembly is the inlet of the second liquefaction compression device, and the outlet of the second liquefaction assembly is the outlet of the second liquefaction compression device.

[0010] In one embodiment, the gas outlet of the dry ice machine is connected to the inlet of the first compression device.

[0011] According to another aspect of the present invention, a control method for an intermittent compression system provided in an embodiment of the present invention is applied to the intermittent compression system described in any of the above embodiments, and the control method for the intermittent compression system includes: when the power consumption period is in the normal power period, controlling the first compression device to compress the carbon dioxide gas, and then controlling the dry ice making mechanism to make dry ice from the carbon dioxide gas compressed by the first compression device; when the power consumption period is in the valley power period, controlling the first compression device to compress the carbon dioxide gas, and then controlling the dry ice making mechanism to make dry ice from the carbon dioxide gas compressed by the first compression device; at the same time, controlling the first intermediate energy storage mechanism to output the carbon dioxide gas to the second intermediate energy storage mechanism, and controlling the second intermediate energy storage mechanism to compress the carbon dioxide output by the first intermediate energy storage mechanism and convert it into liquefied carbon dioxide with a higher pressure and store it; when the power consumption period is in the peak power period, controlling the first compression device to compress the carbon dioxide gas, and controlling the compressed carbon dioxide gas to be input into the first intermediate energy storage mechanism for storage; at the same time, controlling the second intermediate energy storage mechanism to output liquid carbon dioxide to the dry ice making mechanism to make dry ice.

[0012] In one embodiment, the first intermediate energy storage mechanism includes: a first storage tank, the inlet of the first storage tank is connected to the first outlet of the first compression device; the second intermediate energy storage mechanism includes: a first compression assembly, a first liquefaction assembly and a second storage tank, the inlet of the first compression assembly is connected to the outlet of the first storage tank, the inlet of the first liquefaction assembly is connected to the outlet of the first compression assembly, and the inlet of the second storage tank is connected to the outlet of the first liquefaction compression device; the dry ice making mechanism includes: a second compression assembly, a second liquefaction assembly and a dry ice machine, the inlet of the second compression assembly is connected to the second outlet of the first compression device, the inlet of the second liquefaction assembly is connected to the outlet of the second compression assembly, and the gas outlet of the dry ice machine is connected to the inlet of the first compression device; the control method of the intermittent compression system includes: when the power consumption period is in the flat power period, controlling the first compression device to compress the carbon dioxide gas, and then controlling the second compression assembly to pressurize the carbon dioxide raw gas compressed by the first compression device to the liquefaction pressure, controlling the second liquefaction assembly to condense the carbon dioxide pressurized by the second compression assembly into a liquid state, and controlling the dry ice machine to pressurize the carbon dioxide raw gas compressed by the second compression assembly into a liquid state. The liquefied carbon dioxide liquefied by the two liquefaction components is made into dry ice, and the carbon dioxide gas discharged when making dry ice in the dry ice machine is controlled to be input back to the first compression device; when the power consumption period is in the off-peak period, the carbon dioxide raw gas at normal pressure and the carbon dioxide gas output by the dry ice machine are controlled to be compressed to the liquefaction pressure in sequence by the first compression device and the second compression component, and then condensed and liquefied by the second liquefaction component, and then input into the dry ice machine to take out dry ice, and the carbon dioxide gas discharged when making dry ice in the dry ice machine is input back to the first compression device, and at the same time, the first storage tank is controlled to output carbon dioxide gas to the first compression component, and the first compression component is used to compress the carbon dioxide gas to the first compression component. The component pressurizes the carbon dioxide gas output from the first storage tank to the liquefaction pressure, then controls the first liquefaction component to condense the carbon dioxide pressurized by the first compression component into liquid, and finally inputs the liquid carbon dioxide into the second storage tank for storage; when the power consumption period is in the peak power period, controls the carbon dioxide raw gas to be compressed to the pressure of the first storage tank through the first compression device, and then inputs it into the first storage tank for storage, and at the same time, controls the second storage tank to output liquid carbon dioxide to the dry ice machine to make dry ice, and the carbon dioxide gas discharged when making dry ice in the dry ice machine is then input back to the first compression device.

[0013] According to another aspect of the present invention, an embodiment of the present invention provides a system controller for an intermittent compression system, wherein the system controller for the intermittent compression system comprises: a flat power control module, which is used to control the first compression device to compress the carbon dioxide gas when the power consumption period is in the flat power period, and then control the dry ice making mechanism to make dry ice from the carbon dioxide gas compressed by the first compression device; a valley power control module, which is used to control the first compression device to compress the carbon dioxide gas when the power consumption period is in the valley power period, and then control the dry ice making mechanism to make dry ice from the carbon dioxide gas compressed by the first compression device; at the same time, control the first intermediate energy storage mechanism to output the carbon dioxide gas to the second intermediate energy storage mechanism, and control the second intermediate energy storage mechanism to compress the carbon dioxide gas output by the first intermediate energy storage mechanism and convert it into liquefied carbon dioxide of higher pressure and store it; a peak power control module, which is used to control the first compression device to compress the carbon dioxide gas when the power consumption period is in the peak power period, and control the compressed carbon dioxide gas to be input into the first intermediate energy storage mechanism for storage; at the same time, control the second intermediate energy storage mechanism to output liquid carbon dioxide to the dry ice making mechanism to make dry ice.

[0014] The intermittent compression system, control method and system controller provided by the embodiments of the present invention reasonably utilize the country's time-of-use electricity price policy. During the compression process of carbon dioxide, more compression energy-consuming work is allocated during the off-peak period and intermediate products are stored, thereby reducing the compression energy-consuming work during the peak period. The compression energy consumption during the peak period is only the compression of the low-pressure section of the first compression device, and the continuous input of carbon dioxide raw gas is maintained throughout the day without affecting the stable operation of the upstream carbon dioxide capture process. The continuous operation of dry ice production is also maintained throughout the day without affecting the stable production and supply of dry ice, thereby saving electricity costs and shaving peaks and filling valleys, thereby reducing carbon emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a schematic structural diagram of an intermittent compression system provided by an exemplary embodiment of the present application.

[0016] Figure 2 Shown is a schematic structural diagram of an intermittent compression system provided by another exemplary embodiment of the present application.

[0017] Figure 3 Shown is a schematic diagram of the principles of a control method for an intermittent compression system provided by an exemplary embodiment of the present application.

[0018] Explanation of the reference numerals: 1. first compression device; 201. first intermediate energy storage mechanism; 202. second intermediate energy storage mechanism; 203. dry ice making mechanism; 204. first liquefaction compression device; 205. second liquefaction compression device; 2. second compression assembly; 3. second liquefaction assembly; 5. first compression assembly; 6. first liquefaction assembly; 7. second storage tank; 8. dry ice machine; 100. first pipeline; 110. second pipeline; 120. third pipeline; 200. fourth pipeline; 300. fifth pipeline. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0020] In addition, in the exemplary embodiments, because the same reference numerals denote the same components having the same structure or the same steps of the same method, if one embodiment is described exemplarily, only the structures or methods different from the described embodiments are described in other exemplary embodiments. When a component is described as being "connected" to another component, the one component may be "directly connected" to the other component, or "electrically connected" to the other component through a third component. In addition, unless explicitly described to the contrary, the term "include" and its corresponding terms should be understood to include only the components described, and should not be understood to exclude any other components.

[0021] Figure 1 FIG. 1 is a schematic diagram of the structure of an intermittent compression system provided by an exemplary embodiment of the present application. Figure 1 As shown, the intermittent compression system includes: a first compression device 1, the first compression device 1 is used to compress carbon dioxide gas; a first intermediate energy storage mechanism 201, the inlet of the first intermediate energy storage mechanism 201 is connected to the first outlet of the first compression device 1, and the first intermediate energy storage mechanism 201 is configured to convert the carbon dioxide gas compressed by the first compression device 1 into a liquid in a thermodynamic state at a gas-liquid-solid coexistence point and store it; a second intermediate energy storage mechanism 202, the inlet of the second intermediate energy storage mechanism 202 is connected to the outlet of the first intermediate energy storage mechanism 201, and the second intermediate energy storage mechanism 202 is configured to compress the carbon dioxide gas output by the first intermediate energy storage mechanism 201 and convert it into liquefied carbon dioxide at a higher pressure, and store the liquefied carbon dioxide; a dry ice making mechanism 203, the inlet of the dry ice making mechanism 203 is respectively connected to the second outlet of the first compression device 1 and the outlet of the second intermediate energy storage mechanism 202, and the dry ice making mechanism 203 is configured to make dry ice from the carbon dioxide gas compressed by the first compression device 1.

[0022] The dry ice making mechanism 203 is used to perform the work of making dry ice from carbon dioxide gas. After the carbon dioxide raw gas is input into the first compression device 1, it is compressed by the first compression device 1 and input into the dry ice making mechanism 203 from the second outlet. The dry ice making mechanism 203 compresses and liquefies the carbon dioxide gas and then makes dry ice. The dry ice making mechanism 203 can obtain dry ice by throttling and expanding liquid carbon dioxide through a throttling expansion process. At the same time, a portion of the carbon dioxide gas will be released and returned to the inlet of the first compression device 1. The carbon dioxide gas compressed by the first compression device 1 can be input into the first intermediate energy storage mechanism 201 and the second intermediate energy storage mechanism 202 through the first outlet for storage, or it can be directly input into the dry ice making mechanism 203 through the second outlet to make dry ice.

[0023] Based on the structure of the intermittent compression system, different control methods can be used to achieve intermittent energy storage. For example, according to the different electricity price periods of the day, it can be divided into three sections: flat, peak, and valley. Different working strategies are selected for each period, so that the compression energy consumption during the peak electricity period is only the compression of the low-pressure section of the first compression device 1, from normal pressure to about 0.6MPa, and the compression of the high-pressure section compressed to 2-8MPa is transferred to the valley electricity period, thereby halving the peak electricity energy consumption and reducing the electricity cost of the whole day by at least 20%. At the same time, the continuous input of carbon dioxide raw gas throughout the day does not affect the stable operation of the upstream carbon dioxide capture process, and the continuous operation of dry ice making throughout the day does not affect the stable production and supply of dry ice. The first intermediate energy storage mechanism 201 and the second intermediate energy storage mechanism 202 are used to store carbon dioxide in different forms. Carbon dioxide can be stored in, for example, a storage tank according to the usage scenario.

[0024] Figure 2 FIG. 1 is a schematic diagram of the structure of an intermittent compression system provided by another exemplary embodiment of the present application. Figure 2 As shown, the first intermediate energy storage mechanism 201 may include: a first storage tank, the first storage tank is used to store carbon dioxide, the carbon dioxide in the first storage tank is in a thermodynamic state of a gas-liquid-solid coexistence point, the inlet of the first storage tank is connected to the first outlet of the first compression device 1, and the first storage tank is configured to convert the carbon dioxide gas compressed by the first compression device 1 into a liquid in a thermodynamic state of a gas-liquid-solid coexistence point and store it; wherein, the inlet of the first storage tank is the inlet of the first intermediate energy storage mechanism 201, and the outlet of the first storage tank is the outlet of the first intermediate energy storage mechanism 201.

[0025] The gas compressed by the first compression device 1 can be input to the dry ice making mechanism 203, or can be input to the first storage tank for storage. Specifically, the intermittent compression system can also include a first pipeline 100, the first pipeline 100 is connected in series with the first compression device 1 and the first storage tank, one end of the first pipeline 100 is connected to the first outlet of the first compression device 1, and the other end of the first pipeline 100 is connected to the inlet of the first storage tank, and the first compression device 1 is used to compress the raw gas to a specified pressure higher than the pressure of the first storage tank. The carbon dioxide stored in the first storage tank is in a thermodynamic state of gas-liquid-solid coexistence point. When the first storage tank outputs gaseous carbon dioxide, the liquid carbon dioxide in the first storage tank changes into solid and gaseous carbon dioxide, and the solid carbon dioxide is retained in the first storage tank, and the gaseous carbon dioxide is output to the second intermediate energy storage mechanism 202. When the first storage tank inputs gaseous carbon dioxide (from the first compression device 1), the gaseous carbon dioxide input to the first storage tank and the solid carbon dioxide in the first storage tank are jointly changed into liquid carbon dioxide, and the pressure of the gaseous carbon dioxide input to the first storage tank is higher than the pressure in the first storage tank. The output pressure of the first compression device 1 is preferably 0.54 to 0.6 MPa.

[0026] In one embodiment, if Figure 2 As shown, the second intermediate energy storage mechanism 202 includes: a first liquefaction compression device 204, the inlet of the first liquefaction compression device 204 is connected to the outlet of the first storage tank, and the first liquefaction compression device 204 is configured to compress the carbon dioxide gas output from the first storage tank and convert it into liquefied carbon dioxide of higher pressure; a second storage tank 7, the inlet of the second storage tank 7 is connected to the outlet of the first liquefaction compression device 204, the outlet of the second storage tank 7 is connected to the dry ice making mechanism 203, and the second storage tank 7 is configured to store liquid carbon dioxide compressed and liquefied by the first liquefaction compression device 204; wherein the carbon dioxide stored in the second storage tank 7 is in a thermodynamic state of a liquid phase, the inlet of the first liquefaction compression device 204 is the inlet of the second intermediate energy storage mechanism 202, and the outlet of the second storage tank 7 is the outlet of the second intermediate energy storage mechanism 202.

[0027] The second intermediate energy storage mechanism 202 includes a first liquefaction compression device 204 and a second storage tank 7. The first liquefaction compression device 204 is used to pressurize gaseous carbon dioxide to a liquefaction pressure, and then condense it into a liquid state, and store the liquid carbon dioxide in the second storage tank 7. The carbon dioxide stored in the second storage tank 7 is in a thermodynamic state of a liquid phase, preferably at a pressure of 2 to 8 MPa.

[0028] In one embodiment, if Figure 2As shown, the first liquefaction compression device 204 includes: a first compression component 5, the inlet of the first compression component 5 is connected to the outlet of the first storage tank, and the first compression component 5 is configured to pressurize the carbon dioxide gas output from the first storage tank to the liquefaction pressure; a first liquefaction component 6, the inlet of the first liquefaction component 6 is connected to the outlet of the first compression component 5, and the outlet of the first liquefaction component 6 is connected to the inlet of the second storage tank 7, and the first liquefaction component 6 is configured to condense the carbon dioxide pressurized by the first compression component 5 into a liquid state; wherein, the inlet of the first compression component 5 is the inlet of the first liquefaction compression device 204, and the outlet of the first liquefaction component 6 is the outlet of the first liquefaction compression device 204.

[0029] The first compression assembly 5 is used to pressurize the carbon dioxide gas to the liquefaction pressure, and the first liquefaction assembly 6 is used to condense the carbon dioxide into a liquid state. Specifically, the fifth pipeline 300 is connected in series with the first compression assembly 5 and the first liquefaction assembly 6, one end of the fifth pipeline 300 is connected to the outlet of the first storage tank, and the other end of the fifth pipeline 300 is connected to the inlet of the first compression assembly 5, and the outlet of the first compression assembly 5 is connected to the inlet of the first liquefaction assembly 6, and the outlet of the first liquefaction assembly 6 is connected to the inlet of the second storage tank 7, and the outlet of the second storage tank 7 is connected to the dry ice making mechanism 203, and the second storage tank 7 can also provide liquid carbon dioxide for the dry ice making mechanism 203 to make dry ice. It can be understood that the source of liquid carbon dioxide used by the dry ice making mechanism 203 to make dry ice has two parts, one part is carbon dioxide raw gas, which is directly input and then compressed by the first compression device 1 and input to the dry ice making mechanism 203 to generate liquid carbon dioxide, and the other part is liquid carbon dioxide directly input from the second storage tank 7.

[0030] In one embodiment, if Figure 2 As shown, the dry ice making mechanism 203 includes: a second liquefaction compression device 205, the inlet of the second liquefaction compression device 205 is connected to the second outlet of the first compression device 1, and the second liquefaction compression device 205 is configured to compress and liquefy the carbon dioxide gas compressed by the first compression device 1 into liquefied carbon dioxide; a dry ice machine 8, the first inlet of the dry ice machine 8 is connected to the outlet of the second liquefaction compression device 205, the second inlet of the dry ice machine 8 is connected to the outlet of the second intermediate energy storage mechanism 202, and the dry ice machine 8 is configured to make dry ice from the liquefied carbon dioxide compressed by the second liquefaction compression device 205, and to make dry ice from the liquefied carbon dioxide output by the second intermediate energy storage mechanism 202; wherein the second inlet of the dry ice machine 8 is one of the inlets of the dry ice making mechanism 203, and the inlet of the second liquefaction compression device 205 is another inlet of the dry ice making mechanism 203.

[0031] The first liquefaction compression device 204 and the second liquefaction compression device 205 operate in different time periods to adjust the energy consumption during peak power periods, valley power periods and flat power periods. The first compression device 1 and the dry ice machine 8 operate continuously throughout the day, and the first liquefaction compression device 204 and the second liquefaction compression device 205 operate intermittently. The second liquefaction compression device 205 and the first liquefaction compression device 204 are bifurcated at the first compression device 1. When the second liquefaction compression device 205 is working, it directly compresses and liquefies the carbon dioxide gas and then makes dry ice. When the first intermediate energy storage mechanism 201 is in operation, it is mainly used to convert the carbon dioxide gas into liquid carbon dioxide and then store it. Specifically, the second pipeline 110 is connected in series with the second storage tank 7 and the dry ice machine 8. The second storage tank 7 stores liquid carbon dioxide. The outlet of the second storage tank 7 is connected to the inlet of the dry ice machine 8. The second storage tank 7 can directly input liquid carbon dioxide into the dry ice machine 8.

[0032] In one embodiment, if Figure 2 As shown, the second liquefaction compression device 205 includes: a second compression component 2, the inlet of the second compression component 2 is connected to the second outlet of the first compression device 1, and the second compression component 2 is configured to pressurize the carbon dioxide raw gas compressed by the first compression device 1 to a liquefaction pressure; a second liquefaction component 3, the inlet of the second liquefaction component 3 is connected to the outlet of the second compression component 2, and the second liquefaction component 3 is configured to condense the carbon dioxide pressurized by the second compression component 2 into a liquid; wherein, the inlet of the second compression component 2 is the inlet of the second liquefaction compression device 205, and the outlet of the second liquefaction component 3 is the outlet of the second liquefaction compression device 205.

[0033] The second liquefaction compression device 205 includes a second compression assembly 2 and a second liquefaction assembly 3. The second compression assembly 2 is used to pressurize the carbon dioxide gas compressed by the first compression device 1 to the liquefaction pressure, and the second liquefaction assembly 3 is used to condense the carbon dioxide into a liquid state. Specifically, the fourth pipeline 200 is connected in series with the second compression assembly 2 and the second liquefaction assembly 3. One end of the fourth pipeline 200 is connected to the second outlet of the first compression assembly 5, and the other end of the fourth pipeline 200 is connected to the inlet of the second compression assembly 2. The outlet of the second compression assembly 2 is connected to the inlet of the second liquefaction assembly 3, and the outlet of the second liquefaction assembly 3 is connected to the first inlet of the dry ice machine 8. After the second liquefaction assembly 3 condenses the carbon dioxide into liquid carbon dioxide, the liquid carbon dioxide is input into the dry ice machine 8 to make dry ice. The dry ice machine 8 uses the throttling expansion process to obtain dry ice after throttling expansion of liquid carbon dioxide, and discharges carbon dioxide back to gas at the same time.

[0034] In one embodiment, if Figure 2 As shown, the gas outlet of the dry ice machine 8 is connected to the inlet of the first compression device 1 .

[0035] Specifically, the third pipeline 120 connects the gas outlet of the dry ice machine 8 and the inlet of the first compression device 1, and recycles the carbon dioxide discharged from the dry ice machine 8. The first compression device 1 also has a raw gas inlet for directly inputting the carbon dioxide raw gas. Therefore, the carbon dioxide gas compressed by the first compression device 1 has two sources, one is the directly input carbon dioxide raw gas, and the other is the carbon dioxide gas recovered from the dry ice machine 8. The output pressure of the first compression device 1 is preferably 0.54-0.6MPa.

[0036] Figure 3 FIG. 1 is a schematic diagram showing the principle of a control method for an intermittent compression system provided by an exemplary embodiment of the present application. The control method for an intermittent compression system provided by an embodiment of the present invention is applied to any of the above embodiments. Figure 2 The intermittent compression system shown in Figure 3 As shown, the control method of the intermittent compression system includes:

[0037] S1. When the electricity consumption period is in the normal period, the first compression device is controlled to compress the carbon dioxide gas, and then the dry ice making mechanism is controlled to make dry ice from the carbon dioxide gas compressed by the first compression device.

[0038] According to the different electricity price periods of the day, it is divided into three periods: flat, peak and valley. Usually, all three periods are 8 hours. During the day, the peak electricity period usually refers to the time period with the highest electricity demand, which usually occurs during the peak hours of the day, such as in the morning or afternoon. During these periods, the electricity demand usually reaches a peak when people are working, using electrical equipment or performing other high-energy consumption activities. Valley electricity period usually refers to the time period with the lowest electricity demand. These periods usually occur in the late night or early morning of the day. Electricity users are usually resting or sleeping, and the electricity demand is relatively low. The flat electricity period is the time period between the peak electricity period and the valley electricity period. During the flat electricity period, the electricity demand is at a medium level, not as high as the peak period, nor as low as the valley period.

[0039] During the normal power period, the process of making dry ice from carbon dioxide raw gas is carried out normally. The carbon dioxide raw gas at normal pressure is compressed to the liquefaction pressure by the dry ice making mechanism 203, condensed and liquefied, and then dry ice is made. The carbon dioxide gas discharged when making dry ice is recycled back to the inlet of the first compression device 1. At this time, only the first compression device 1 and the dry ice making mechanism 203 are in operation, and the power consumption is moderate.

[0040] S2. When the electricity consumption period is in the off-peak period, the first compression device is controlled to compress the carbon dioxide gas, and then the dry ice making mechanism is controlled to make dry ice from the carbon dioxide gas compressed by the first compression device; at the same time, the first intermediate energy storage mechanism is controlled to output the carbon dioxide gas to the second intermediate energy storage mechanism, and the second intermediate energy storage mechanism is controlled to compress the carbon dioxide gas output by the first intermediate energy storage mechanism and convert it into liquefied carbon dioxide of higher pressure and store it.

[0041] During the valley power period, the process of making dry ice from carbon dioxide raw gas and the process of the first intermediate energy storage mechanism 201 outputting gas and compressing, liquefying, and storing it in the second intermediate energy storage mechanism 202 are completed. The carbon dioxide raw gas at normal pressure and the circulating gas output by the dry ice making mechanism 203 are used to make dry ice through the first compression device 1 and the dry ice making mechanism 203, and the carbon dioxide gas discharged when making dry ice is recycled back to the entrance of the first compression device 1. At the same time, the first intermediate energy storage mechanism 201 outputs carbon dioxide gas, which is compressed to the liquefaction pressure, condensed and liquefied by the second intermediate energy storage mechanism 202, and finally stored. At this time, the compression of the high-pressure section compressed to 2-8MPa is transferred to the valley power period, and the most electricity is consumed during the valley power period.

[0042] S3. When the electricity consumption period is in the peak electricity consumption period, the first compression device is controlled to compress the carbon dioxide gas, and the compressed carbon dioxide gas is controlled to be input into the first intermediate energy storage mechanism for storage; at the same time, the second intermediate energy storage mechanism is controlled to output liquid carbon dioxide to the dry ice making mechanism to make dry ice.

[0043] During the peak electricity period, the process of compressing the carbon dioxide gas and inputting it into the first intermediate energy storage mechanism 201 for storage and the process of outputting the liquid from the second intermediate energy storage mechanism 202 and inputting it into the dry ice making mechanism 203 for making dry ice are completed. The carbon dioxide raw gas at normal pressure and the circulating gas output from the dry ice making mechanism 203 are compressed to the pressure of the first intermediate energy storage mechanism 201 by the first compression device 1 and inputted into the first intermediate energy storage mechanism 201 for storage. At the same time, the second intermediate energy storage mechanism 202 outputs liquid carbon dioxide, which is then inputted into the dry ice making mechanism 203 for making dry ice, and the carbon dioxide gas outputted from the dry ice making mechanism 203 is recycled back to the inlet of the first compression device 1. At this time, the compression energy consumption during the peak electricity period is only the compression of the low-pressure section of the first compression device 1, thereby halving the peak electricity energy consumption and reducing the electricity cost for full-day operation by at least 20%.

[0044] The control method mentioned above makes the compression energy consumption during the peak power period only the compression of the low-pressure section of the first compression device 1 from normal pressure to about 0.6MPa, and transfers the compression of the high-pressure section compressed to 2-8MPa to the valley power period, thereby halving the peak power consumption and reducing the electricity cost of the whole day by at least 20%; at the same time, the continuous input of carbon dioxide raw gas throughout the day does not affect the stable operation of the upstream carbon dioxide capture process, and also maintains the continuous operation of the dry ice making mechanism 203 throughout the day, without affecting the stable production and supply of dry ice. The present invention is also applicable to the carbon dioxide compression process in other fields, playing the role of saving electricity costs and shaving peaks and filling valleys.

[0045] In one embodiment, if Figure 2 As shown, the first intermediate energy storage mechanism 201 includes: a first storage tank, the inlet of the first storage tank is connected to the first outlet of the first compression device 1; the second intermediate energy storage mechanism 202 includes: a first compression component 5, a first liquefaction component 6 and a second storage tank 7, the inlet of the first compression component 5 is connected to the outlet of the first storage tank, the inlet of the first liquefaction component 6 is connected to the outlet of the first compression component 5, and the inlet of the second storage tank 7 is connected to the outlet of the first liquefaction compression device 204; the dry ice making mechanism 203 includes: a second compression component 2, a second liquefaction component 3 and a dry ice machine 8, the inlet of the second compression component 2 is connected to the second outlet of the first compression device 1, the inlet of the second liquefaction component 3 is connected to the outlet of the second compression component 2, and the gas outlet of the dry ice machine 8 is connected to the inlet of the first compression device 1.

[0046] Based on this, the control method of the intermittent compression system can be adjusted as follows:

[0047] The above S1 includes: when the power consumption period is in the normal power period, controlling the first compression device 1 to compress the carbon dioxide gas, and then controlling the second compression component 2 to pressurize the carbon dioxide raw gas compressed by the first compression device 1 to the liquefaction pressure, controlling the second liquefaction component 3 to condense the carbon dioxide pressurized by the second compression component 2 into a liquid state, controlling the dry ice machine 8 to make dry ice from the liquefied carbon dioxide liquefied by the second liquefaction component 3, and controlling the carbon dioxide gas discharged from the dry ice machine 8 when making dry ice to be input back to the first compression device 1; the above S2 includes: when the power consumption period is in the valley power period, controlling the carbon dioxide raw gas at normal pressure and the carbon dioxide gas output by the dry ice machine 8 to be compressed to the liquefaction pressure by the first compression device 1 and the second compression component 2 in sequence, and then condensed and liquefied by the second liquefaction component 3, and then input into the dry ice machine 8. The ice machine 8 makes dry ice, and the carbon dioxide gas discharged when making dry ice in the dry ice machine 8 is input back to the first compression device 1. At the same time, the first storage tank is controlled to output the carbon dioxide gas to the first compression component 5, and the first compression component 5 pressurizes the carbon dioxide gas output from the first storage tank to the liquefaction pressure, and then controls the first liquefaction component 6 to condense the carbon dioxide pressurized by the first compression component 5 into liquid, and finally inputs the liquid carbon dioxide into the second storage tank 7 for storage; the above S3 includes: when the power consumption period is in the peak power period, the carbon dioxide raw gas is controlled to be compressed to the pressure of the first storage tank through the first compression device 1, and then input into the first storage tank for storage, and at the same time, the second storage tank 7 is controlled to output liquid carbon dioxide to the dry ice machine 8 to make dry ice, and the carbon dioxide gas discharged when making dry ice in the dry ice machine 8 is input back to the first compression device 1.

[0048] The normal power period includes the process of making dry ice from carbon dioxide raw gas. The carbon dioxide raw gas at normal pressure is compressed to the liquefaction pressure by the first compression device 1 and the second compression component 2 in sequence, then condensed and liquefied by the second liquefaction component 3, and then input into the dry ice machine 8 to make dry ice. The carbon dioxide gas output by the dry ice machine 8 is recycled back to the inlet of the first compression device 1.

[0049] The off-peak period includes the process of making dry ice from carbon dioxide raw gas and the process of outputting gas from the first storage tank and compressing and liquefying it and inputting it into the second storage tank 7. The carbon dioxide raw gas at normal pressure and the circulating gas output from the dry ice machine 8 are compressed to the liquefaction pressure by the first compression device 1 and the second compression component 2 in sequence, and then condensed and liquefied by the second liquefaction component 3, and then input into the dry ice machine 8 to make dry ice. The carbon dioxide gas output from the dry ice machine 8 is recycled back to the inlet of the first compression device 1. At the same time, the carbon dioxide gas output from the first storage tank is compressed to the liquefaction pressure by the first compression component 5, and then condensed and liquefied by the first liquefaction component 6, and then input into the second storage tank 7 for storage.

[0050] The peak power period includes the process of carbon dioxide gas being compressed and input into the first storage tank for storage and the process of liquid being output from the second storage tank 7 and input into the dry ice machine 8 for making dry ice. The carbon dioxide raw gas at normal pressure and the circulating gas output from the dry ice machine 8 are compressed to the pressure of the first storage tank by the first compression device 1 and input into the first storage tank for storage. At the same time, the second storage tank 7 outputs liquid carbon dioxide, which is then input into the dry ice machine 8 for making dry ice, and the carbon dioxide gas output from the dry ice machine 8 is recycled back to the inlet of the first compression device 1.

[0051] Therefore, in the above method, the first compression device 1 and the dry ice machine 8 are operated continuously throughout the day, and the first compression assembly 5, the first liquefaction assembly 6, the second compression assembly 2 and the second liquefaction assembly 3 are operated intermittently.

[0052] According to another aspect of the present invention, an embodiment of the present invention provides a system controller for an intermittent compression system, the system controller for the intermittent compression system is used to execute the control method of the intermittent compression system in any one of the above embodiments, and the system controller for the intermittent compression system includes: a flat power control module, which is used to control the first compression device to compress the carbon dioxide gas when the power consumption period is in the flat power period, and then control the dry ice making mechanism to make dry ice from the carbon dioxide gas compressed by the first compression device; a valley power control module, which is used to control the first compression device to compress the carbon dioxide gas when the power consumption period is in the valley power period, and then control the dry ice making mechanism to make dry ice from the carbon dioxide gas compressed by the first compression device; at the same time, control the first intermediate energy storage mechanism to output the carbon dioxide gas to the second intermediate energy storage mechanism, and control the second intermediate energy storage mechanism to compress the carbon dioxide gas output by the first intermediate energy storage mechanism and convert it into liquefied carbon dioxide with a higher pressure and store it; a peak power control module, which is used to control the first compression device to compress the carbon dioxide gas when the power consumption period is in the peak power period, and control the compressed carbon dioxide gas to be input into the first intermediate energy storage mechanism for storage; at the same time, control the second intermediate energy storage mechanism to output liquid carbon dioxide to the dry ice making mechanism to make dry ice.

[0053] The system controller of the intermittent compression system provided by the embodiment of the present invention reasonably utilizes the country's time-of-use electricity price policy. During the compression process of carbon dioxide, more compression energy-consuming work is allocated during the off-peak period and intermediate products are stored, thereby reducing the compression energy-consuming work during the peak period. The compression energy consumption during the peak period is only the compression of the low-pressure section of the first compression device, and the continuous input of carbon dioxide raw gas is maintained throughout the day without affecting the stable operation of the upstream carbon dioxide capture process. The continuous operation of dry ice production is also maintained throughout the day without affecting the stable production and supply of dry ice, thereby saving electricity costs and shaving peaks and filling valleys, thereby reducing carbon emissions.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An intermittent compression system, characterized in that: include: A first compression device (1), the first compression device (1) is used to compress carbon dioxide gas; a first intermediate energy storage mechanism (201), wherein the inlet of the first intermediate energy storage mechanism (201) is connected to the first outlet of the first compression device (1), and the first intermediate energy storage mechanism (201) is configured to convert the carbon dioxide gas compressed by the first compression device (1) into a liquid in a thermodynamic state at a gas-liquid-solid coexistence point and store the liquid; a second intermediate energy storage mechanism (202), wherein the inlet of the second intermediate energy storage mechanism (202) is connected to the outlet of the first intermediate energy storage mechanism (201), and the second intermediate energy storage mechanism (202) is configured to compress the carbon dioxide gas output by the first intermediate energy storage mechanism (201) and convert it into liquefied carbon dioxide with a higher pressure and store it; a dry ice making mechanism (203), wherein the inlet of the dry ice making mechanism (203) is respectively connected to the second outlet of the first compression device (1) and the outlet of the second intermediate energy storage mechanism (202), and the dry ice making mechanism (203) is configured to make dry ice from the carbon dioxide gas compressed by the first compression device (1); The control methods of intermittent compression system include: When the electricity consumption period is in the normal period, the first compression device (1) is controlled to compress the carbon dioxide gas, and then the dry ice making mechanism (203) is controlled to make dry ice from the carbon dioxide gas compressed by the first compression device (1); When the electricity consumption period is in the off-peak period, the first compression device (1) is controlled to compress the carbon dioxide gas, and then the dry ice making mechanism (203) is controlled to make dry ice from the carbon dioxide gas compressed by the first compression device (1); at the same time, the first intermediate energy storage mechanism (201) is controlled to output the carbon dioxide gas to the second intermediate energy storage mechanism (202), and the second intermediate energy storage mechanism (202) is controlled to compress the carbon dioxide gas output by the first intermediate energy storage mechanism (201) and convert it into liquefied carbon dioxide with a higher pressure and store it; When the electricity consumption period is in the peak electricity consumption period, the first compression device (1) is controlled to compress the carbon dioxide gas, and the compressed carbon dioxide gas is controlled to be input into the first intermediate energy storage mechanism (201) for storage; at the same time, the second intermediate energy storage mechanism (202) is controlled to output liquid carbon dioxide to the dry ice making mechanism (203) to make dry ice.

2. The intermittent compression system according to claim 1, characterized in that: The first intermediate energy storage mechanism (201) comprises: A first storage tank, the first storage tank is used to store carbon dioxide, the carbon dioxide in the first storage tank is in a thermodynamic state at a gas-liquid-solid coexistence point, the inlet of the first storage tank is connected to the first outlet of the first compression device (1), and the first storage tank is configured to convert the carbon dioxide gas compressed by the first compression device (1) into a liquid in a thermodynamic state at a gas-liquid-solid coexistence point and store it; wherein the inlet of the first storage tank is the inlet of the first intermediate energy storage mechanism (201), and the outlet of the first storage tank is the outlet of the first intermediate energy storage mechanism (201).

3. The intermittent compression system according to claim 2, characterized in that: The second intermediate energy storage mechanism (202) comprises: a first liquefaction compression device (204), wherein the inlet of the first liquefaction compression device (204) is connected to the outlet of the first storage tank, and the first liquefaction compression device (204) is configured to compress the carbon dioxide gas output from the first storage tank and convert it into liquefied carbon dioxide with a higher pressure; a second storage tank (7), wherein the inlet of the second storage tank (7) is connected to the outlet of the first liquefaction compression device (204), the outlet of the second storage tank (7) is connected to the dry ice making mechanism (203), and the second storage tank (7) is configured to store liquid carbon dioxide compressed and liquefied by the first liquefaction compression device (204); The carbon dioxide stored in the second storage tank (7) is in a liquid thermodynamic state, the inlet of the first liquefaction compression device (204) is the inlet of the second intermediate energy storage mechanism (202), and the outlet of the second storage tank (7) is the outlet of the second intermediate energy storage mechanism (202).

4. The intermittent compression system according to claim 3, characterized in that: The first liquefaction compression device (204) comprises: a first compression assembly (5), wherein the inlet of the first compression assembly (5) is connected to the outlet of the first storage tank, and the first compression assembly (5) is configured to pressurize the carbon dioxide gas output from the first storage tank to a liquefied pressure; a first liquefaction assembly (6), wherein the inlet of the first liquefaction assembly (6) is in communication with the outlet of the first compression assembly (5), the outlet of the first liquefaction assembly (6) is in communication with the inlet of the second storage tank (7), and the first liquefaction assembly (6) is configured to condense the carbon dioxide pressurized by the first compression assembly (5) into a liquid state; The inlet of the first compression component (5) is the inlet of the first liquefaction compression device (204), and the outlet of the first liquefaction component (6) is the outlet of the first liquefaction compression device (204).

5. The intermittent compression system according to claim 1, characterized in that: The dry ice making mechanism (203) comprises: a second liquefaction compression device (205), wherein the inlet of the second liquefaction compression device (205) is connected to the second outlet of the first compression device (1), and the second liquefaction compression device (205) is configured to compress and liquefy the carbon dioxide gas compressed by the first compression device (1) into liquefied carbon dioxide; A dry ice machine (8), wherein a first inlet of the dry ice machine (8) is connected to an outlet of the second liquefaction compression device (205), and a second inlet of the dry ice machine (8) is connected to an outlet of the second intermediate energy storage mechanism (202), and the dry ice machine (8) is configured to convert liquefied carbon dioxide compressed by the second liquefaction compression device (205) into dry ice, and to convert liquefied carbon dioxide outputted from the second intermediate energy storage mechanism (202) into dry ice; The second inlet of the dry ice machine (8) is one of the inlets of the dry ice making mechanism (203), and the inlet of the second liquefaction compression device (205) is another inlet of the dry ice making mechanism (203).

6. The intermittent compression system according to claim 5, characterized in that: The second liquefaction compression device (205) comprises: a second compression assembly (2), the inlet of the second compression assembly (2) being in communication with the second outlet of the first compression device (1), the second compression assembly (2) being configured to pressurize the carbon dioxide raw gas compressed by the first compression device (1) to a liquefied pressure; a second liquefaction component (3), the inlet of the second liquefaction component (3) being in communication with the outlet of the second compression component (2), the second liquefaction component (3) being configured to condense the carbon dioxide pressurized by the second compression component (2) into a liquid state; The inlet of the second compression component (2) is the inlet of the second liquefaction compression device (205), and the outlet of the second liquefaction component (3) is the outlet of the second liquefaction compression device (205).

7. The intermittent compression system according to claim 5, characterized in that: The gas outlet of the dry ice machine (8) is in communication with the inlet of the first compression device (1).

8. A control method for an intermittent compression system, applied to the intermittent compression system according to claim 1, characterized in that: The control methods of intermittent compression system include: When the electricity consumption period is in the normal period, the first compression device (1) is controlled to compress the carbon dioxide gas, and then the dry ice making mechanism (203) is controlled to make dry ice from the carbon dioxide gas compressed by the first compression device (1); When the electricity consumption period is in the off-peak period, the first compression device (1) is controlled to compress the carbon dioxide gas, and then the dry ice making mechanism (203) is controlled to make dry ice from the carbon dioxide gas compressed by the first compression device (1); at the same time, the first intermediate energy storage mechanism (201) is controlled to output the carbon dioxide gas to the second intermediate energy storage mechanism (202), and the second intermediate energy storage mechanism (202) is controlled to compress the carbon dioxide gas output by the first intermediate energy storage mechanism (201) and convert it into liquefied carbon dioxide with a higher pressure and store it; When the electricity consumption period is in the peak electricity consumption period, the first compression device (1) is controlled to compress the carbon dioxide gas, and the compressed carbon dioxide gas is controlled to be input into the first intermediate energy storage mechanism (201) for storage; at the same time, the second intermediate energy storage mechanism (202) is controlled to output liquid carbon dioxide to the dry ice making mechanism (203) to make dry ice.

9. The control method of an intermittent compression system according to claim 8, characterized in that: The first intermediate energy storage mechanism (201) comprises: a first storage tank, the inlet of the first storage tank is connected to the first outlet of the first compression device (1); the second intermediate energy storage mechanism (202) comprises: a first compression assembly (5), a first liquefaction assembly (6) and a second storage tank (7), the inlet of the first compression assembly (5) is connected to the outlet of the first storage tank, the inlet of the first liquefaction assembly (6) is connected to the outlet of the first compression assembly (5), and the inlet of the second storage tank (7) is connected to the outlet of the first liquefaction compression device (204); the dry ice making mechanism (203) comprises: a second compression assembly (2), a second liquefaction assembly (3) and a dry ice machine (8), the inlet of the second compression assembly (2) is connected to the second outlet of the first compression device (1), the inlet of the second liquefaction assembly (3) is connected to the outlet of the second compression assembly (2), and the gas outlet of the dry ice machine (8) is connected to the inlet of the first compression device (1); The control method of the intermittent compression system comprises: When the electricity consumption period is in the normal period, the first compression device (1) is controlled to compress the carbon dioxide gas, and then the second compression component (2) is controlled to pressurize the carbon dioxide raw gas compressed by the first compression device (1) to a liquefaction pressure, the second liquefaction component (3) is controlled to condense the carbon dioxide pressurized by the second compression component (2) into a liquid state, the dry ice machine (8) is controlled to make dry ice from the liquefied carbon dioxide liquefied by the second liquefaction component (3), and the carbon dioxide gas discharged from the dry ice machine (8) when making dry ice is controlled to be input back into the first compression device (1); When the electricity consumption period is in the off-peak period, the carbon dioxide raw gas at normal pressure and the carbon dioxide gas output by the dry ice machine (8) are controlled to be compressed to a liquefaction pressure by the first compression device (1) and the second compression component (2) in sequence, and then condensed and liquefied by the second liquefaction component (3), and then input into the dry ice machine (8) to make dry ice, and the carbon dioxide gas discharged from the dry ice machine (8) when making dry ice is input back into the first compression device (1), and at the same time, the first storage tank is controlled to output carbon dioxide gas to the first compression component (5), the first compression component (5) pressurizes the carbon dioxide gas output by the first storage tank to a liquefaction pressure, and then the first liquefaction component (6) is controlled to condense the carbon dioxide pressurized by the first compression component (5) into a liquid state, and finally the liquid carbon dioxide is input into the second storage tank (7) for storage; When the electricity consumption period is during the peak electricity consumption period, the carbon dioxide raw gas is controlled to be compressed to the pressure of the first storage tank through the first compression device (1), and then input into the first storage tank for storage. At the same time, the second storage tank (7) is controlled to output liquid carbon dioxide to the dry ice machine (8) to make dry ice. The carbon dioxide gas discharged when making dry ice in the dry ice machine (8) is then input back into the first compression device (1).

10. A system controller for an intermittent compression system, characterized in that: The system controller of the intermittent compression system comprises: A flat power control module, used for controlling the first compression device (1) to compress the carbon dioxide gas when the power consumption period is in the flat power period, and then controlling the dry ice making mechanism (203) to make dry ice from the carbon dioxide gas compressed by the first compression device (1); A valley power control module is used for controlling the first compression device (1) to compress the carbon dioxide gas when the power consumption period is in the valley power period, and then controlling the dry ice making mechanism (203) to make dry ice from the carbon dioxide gas compressed by the first compression device (1); at the same time, controlling the first intermediate energy storage mechanism (201) to output the carbon dioxide gas to the second intermediate energy storage mechanism (202), and controlling the second intermediate energy storage mechanism (202) to compress the carbon dioxide gas output by the first intermediate energy storage mechanism (201) and convert it into liquefied carbon dioxide with a higher pressure for storage; The peak power control module is used to control the first compression device (1) to compress the carbon dioxide gas when the power consumption period is in the peak power period, and control the compressed carbon dioxide gas to be input into the first intermediate energy storage mechanism (201) for storage; at the same time, control the second intermediate energy storage mechanism (202) to output liquid carbon dioxide to the dry ice making mechanism (203) to make dry ice.

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