CN117628836A - Carbon dioxide energy storage system and method for reducing carbon dioxide temperature floating - Google Patents

Abstract

The embodiment of the invention relates to the technical field of carbon dioxide energy storage, and discloses a carbon dioxide energy storage system and a method for reducing carbon dioxide temperature floating, wherein the carbon dioxide energy storage system comprises a gas storage, a preheater, an energy storage loop, a liquid storage tank, an energy release loop and a first fan; the preheater is provided with first hot passageway and first cold passageway, and gas storage storehouse, first cold passageway, energy storage circuit, liquid storage pot and energy release circuit connect gradually and form the closed loop, and first fan and first hot passageway intercommunication, first fan still communicate underground mine, and first fan is arranged in driving the air in the underground mine and gets into first hot passageway to provide heat for the carbon dioxide that flows through first cold passageway. By the mode, the embodiment of the invention can improve the temperature of the carbon dioxide entering the energy storage loop in winter.

Description

Carbon dioxide energy storage system and method for reducing carbon dioxide temperature floating

Technical Field

The embodiment of the invention relates to the technical field of carbon dioxide energy storage, in particular to a carbon dioxide energy storage system and a method for reducing carbon dioxide temperature floating.

Background

At present, a carbon dioxide energy storage system is divided into an energy storage process and an energy release process, wherein the energy storage process is to compress and cool carbon dioxide at normal temperature and normal pressure in a gas storage to form low-temperature liquid carbon dioxide, the energy release process is to gasify and heat the liquid carbon dioxide to form high-temperature and high-pressure carbon dioxide, and the high-temperature and high-pressure carbon dioxide enters an expansion machine to expand and do work to generate electricity, and then the carbon dioxide at normal temperature and normal pressure flows into the gas storage, so that energy is released. In winter, if the temperature of the carbon dioxide stored in the gas storage is low, on one hand, according to the principle of thermal expansion and contraction, the volume of the carbon dioxide of the inner membrane is reduced, the outer membrane is required to be increased to supplement air to the interlayer cavity between the inner membrane and the outer membrane in order to maintain the shape to resist wind and snow, so that the energy consumption is increased, on the other hand, the temperature of the carbon dioxide is difficult to reach the rated temperature of the inlet of the compressor, the temperature of the working medium at the outlet of the compressor is lower than the rated temperature, and the efficiency of the energy storage system is reduced. In summer, the environment temperature is high, the gaseous carbon dioxide after expansion work is only radiated in the atmosphere, the temperature of the gaseous carbon dioxide can be increased at extremely high temperature, the temperature of the gas stored in the gas storage accommodating cavity can exceed the design temperature condition of the inner membrane, and the safety risk exists.

Disclosure of Invention

In order to solve at least one of the problems, a technical scheme adopted by the embodiment of the invention is as follows: the carbon dioxide energy storage system comprises an air storage, a preheater, an energy storage loop, a liquid storage tank, an energy release loop and a first fan; the preheater is provided with first hot passageway and first cold passageway, and gas storage storehouse, first cold passageway, energy storage circuit, liquid storage pot and energy release circuit connect gradually and form the closed loop, and first fan and first hot passageway intercommunication, first fan still communicate underground mine, and first fan is arranged in driving the air in the underground mine and gets into first hot passageway to provide heat for the carbon dioxide that flows through first cold passageway.

Optionally, one end of the first fan is communicated with the underground mine, and the other end of the first fan is communicated with the inlet of the first heat channel; or one end of the first fan is connected with the outlet of the first heat channel, and the other end of the first fan is communicated with the outside; or, the preheater is arranged at the wellhead of the underground mine, the preheater covers the wellhead of the underground mine, the inlet of the first heat channel is communicated with the wellhead of the underground mine, one end of the first fan is communicated with the outlet of the first heat channel, and the other end of the first fan is communicated with the outside.

Optionally, the carbon dioxide energy storage system further comprises a first gas pipeline extending at least partially into the underground mine, the first gas pipeline further communicating with the first thermal passage, and the first fan is configured to drive air in the underground mine through the first gas pipeline into the first thermal passage.

Optionally, the carbon dioxide energy storage system further comprises a second fan and a heat exchanger, the heat exchanger is provided with a second cold channel and a second hot channel, the gas storage, the first cold channel, the energy storage loop, the liquid storage tank, the energy release loop and the second hot channel are sequentially connected to form a closed loop, the second fan is communicated with the second cold channel, the second fan is further communicated with the underground mine, and the second fan is used for driving air in the underground mine to flow into the second cold channel so as to cool the carbon dioxide flowing through the second hot channel.

Optionally, one end of the second fan is communicated with the underground mine, the other end of the second fan is communicated with an inlet of the second cold channel, and an outlet of the second cold channel is communicated with the outside; or the inlet of the second cooling channel is communicated with the underground mine, one end of the second fan is communicated with the outlet of the second cooling channel, and the other end of the second fan is communicated with the outside; or, the heat exchanger is arranged at the wellhead of the underground mine, the heat exchanger covers the wellhead of the underground mine, the inlet of the second cooling channel is communicated with the wellhead of the underground mine, one end of the second fan is communicated with the outlet of the second cooling channel, and the other end of the second fan is communicated with the outside.

Optionally, the carbon dioxide energy storage system further comprises a second gas duct extending at least partially into the underground mine, the second gas duct further communicating with the second cold aisle, the second fan being for driving air in the underground mine through the second bleed air aisle into the second cold aisle.

Optionally, the underground mine comprises a shaft and an underground tunnel, the bottom of the shaft is communicated with the underground tunnel, the first gas pipeline part penetrates through the shaft and then stretches into the underground tunnel, the first gas pipeline is provided with a gas inlet, and air in the underground tunnel can enter the first gas pipeline from the gas inlet.

Optionally, the carbon dioxide energy storage system further comprises a third fan, the gas storage warehouse is in sealed connection with the inlet of the underground mine, the third fan is connected with the outlet of the underground mine, and the third fan is used for pumping out air in the underground mine when the carbon dioxide energy storage system is in an initial state.

In order to solve at least one of the above technical problems, another technical solution adopted in the embodiment of the present invention is: providing another carbon dioxide energy storage system, which comprises a gas storage, an energy storage loop, a liquid storage tank, an energy release loop, a heat exchanger and a second fan; the air storage, the first cold channel, the energy storage loop, the liquid storage tank, the energy release loop and the second hot channel are sequentially connected to form a closed loop, the second fan is communicated with the second cold channel and is also communicated with the underground mine, and the second fan is used for driving air in the underground mine to flow into the second cold channel so as to cool carbon dioxide flowing through the second hot channel.

In order to solve at least one of the above technical problems, another technical solution adopted in the embodiment of the present invention is: the method for reducing the carbon dioxide temperature floating comprises the steps that when the carbon dioxide temperature in a gas storage is lower than a first preset temperature, a first fan is opened and drives air in an underground mine to flow into a first hot channel, carbon dioxide flowing through a first cold channel absorbs heat and then enters an energy storage loop, and the energy storage loop compresses and condenses the carbon dioxide into a liquid state and then stores the liquid state in a liquid storage tank; and/or when the temperature of the carbon dioxide in the gas storage is higher than a second preset temperature, the second fan is turned on to drive the air in the underground mine to flow into the second cold channel, and the carbon dioxide flowing through the second hot channel absorbs the cold energy of the air in the second cold channel to cool and then flow into the gas storage for storage.

The beneficial effects of the embodiment of the invention at least comprise one of the following: (1) When the temperature in the abandoned mines with a plurality of widely-distributed coal mines, iron ores and copper ores is higher than the temperature of the carbon dioxide in the gas storage, the first fan drives the high-temperature air in the underground mines to enter the first hot channel and then to be discharged outside, and the carbon dioxide flowing out of the gas storage can absorb the heat of the air in the first hot channel when passing through the first cold channel, so that the temperature of the carbon dioxide entering the energy storage loop is increased, the temperature of the carbon dioxide can reach the rated temperature of the compressor in the energy storage loop, the efficiency of the energy storage system is improved, and the external heat supply is reduced.

(2) The air in the underground mine can be utilized to cool or preheat the carbon dioxide in the carbon dioxide energy storage system, and the temperature of the carbon dioxide gas is regulated, so that the energy consumption of the carbon dioxide energy storage system is effectively reduced. The system is particularly suitable for preheating the gaseous carbon dioxide at the outlet of the gas storage in winter and/or cooling the gaseous carbon dioxide at the inlet of the gas storage in summer, so that energy consumption caused by weather is compensated, and the carbon dioxide energy storage system does not need to add more energy for cooling or preheating the carbon dioxide.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or portions are generally identified by like reference numerals throughout the several figures. In the drawings, elements or portions thereof are not necessarily drawn to scale.

FIG. 1 is a schematic diagram of a carbon dioxide energy storage system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a carbon dioxide energy storage system according to an embodiment of the present invention when a first heat channel is disposed between a first fan and an underground mine

FIG. 3 is a schematic diagram of a carbon dioxide energy storage system according to an embodiment of the present invention when a preheater is disposed at a wellhead of an underground mine;

FIG. 4 is a schematic diagram of a carbon dioxide energy storage system including a first gas conduit according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a carbon dioxide energy storage system according to an embodiment of the present invention including a second fan and a heat exchanger;

FIG. 6 is a schematic diagram of a carbon dioxide energy storage system according to an embodiment of the present invention when a second cooling channel is disposed between a second fan and an underground mine;

FIG. 7 is a schematic diagram of a carbon dioxide energy storage system according to an embodiment of the present invention when a heat exchanger is disposed at a wellhead of an underground mine;

FIG. 8 is a schematic diagram of a carbon dioxide energy storage system including a second gas conduit according to an embodiment of the present invention;

FIG. 9 is a schematic cross-sectional view of A-A of FIG. 8;

FIG. 10 is a schematic diagram of a carbon dioxide energy storage system including a heat exchange assembly according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of another carbon dioxide energy storage system provided in an embodiment of the present invention;

Fig. 12 is a schematic diagram of another carbon dioxide energy storage system provided in an embodiment of the present invention when a preheater is provided at the wellhead of an underground mine.

Detailed Description

In order that the invention may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "upper," "lower," "inner," "outer," "vertical," "horizontal," and the like as used in this specification, refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience of description and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.

In addition, the technical features mentioned in the different embodiments of the invention described below can be combined with one another as long as they do not conflict with one another.

In carbon dioxide energy storage systems, the carbon dioxide stored in the gas reservoir needs to be compressed, and the temperature of the carbon dioxide entering the compressor needs to be adapted to the rated operating temperature of the compressor. In order to ensure that the gas storage can store enough carbon dioxide, the occupied area of the gas storage is large, so the gas storage is usually required to be arranged on open ground, and the temperature on the ground changes in a floating way along with the change of seasons, so that the temperature of the carbon dioxide in the gas storage also changes in a floating way along with the change of seasons. When the ground temperature is too low in winter, the temperature of the carbon dioxide in the gas storage is difficult to be matched with the rated working temperature of the compressor, so that the temperature of the carbon dioxide at the outlet of the compressor in the energy storage loop is lower than the rated working temperature, the efficiency of the energy storage system is easy to be reduced, the temperature of the carbon dioxide entering the compressor needs to be controlled, and in addition, when the temperature of the gas stored in the storage accommodating cavity is extremely high in summer, the temperature of the gas stored in the storage accommodating cavity can exceed the design temperature condition of the inner film, so that the safety risk exists. The applicant finds that China has rich mineral resources, such as coal mines, iron ores, copper ores and the like, a large number of abandoned underground mines can be left after the mining is finished, the underground mines are far away from the ground, the air temperature in some underground mines has the characteristic of being warm in winter and cool in summer, and the underground mines with the underground depth not exceeding 500 meters are exemplified; while the air temperature in some underground mines remains high throughout the year, illustrative of underground mines with depths in excess of 500 meters, a common feature of these underground mines is: the air temperature in the underground mines does not change greatly with the change of seasons, and the underground mines are not searched for to be utilized in a carbon dioxide gas-liquid two-phase energy storage system.

Referring to fig. 1, the carbon dioxide energy storage system includes: the present invention provides a carbon dioxide energy storage system 100, comprising: the system comprises a gas storage 11, a preheater 12, a storage loop 13, a liquid storage tank 14, an energy release loop 15 and a first fan 16. The gas storage 11 is used for storing carbon dioxide at normal temperature and normal pressure, the preheater 12 is provided with a first hot channel 121 and a first cold channel 122, an inlet of the first cold channel 122 is communicated with an outlet of the gas storage 11, an outlet of the first cold channel 122 is communicated with an inlet of the energy storage loop 13, an outlet of the energy storage loop 13 is communicated with an inlet of the liquid storage tank 14, an inlet of the energy release loop 15 is communicated with an outlet of the liquid storage tank 14, and an outlet of the energy release loop 15 is communicated with an inlet of the gas storage 11, so that the gas storage 11, the first cold channel 122, the energy storage loop 13, the liquid storage tank 14 and the energy release loop 15 are sequentially connected to form a closed loop. The energy storage loop 13 is used for compressing and condensing carbon dioxide at normal temperature and normal pressure into liquid state and storing the liquid carbon dioxide in the liquid storage tank 14, and the energy release loop 15 is used for evaporating and expanding the liquid carbon dioxide in the liquid storage tank 14 and then releasing energy to form gaseous carbon dioxide at normal temperature and normal pressure to flow into the gas storage 11. The first fan 16 is communicated with the first heat channel 121, the first fan 16 is further communicated with the underground mine 200, the first fan 16 is used for driving air in the underground mine 200 to enter the first heat channel 121, when carbon dioxide at normal temperature and normal pressure in the air storage 11 flows through the first cold channel 122, the carbon dioxide can exchange heat with the air in the underground mine 200 flowing through the first heat channel 121, so that the temperature of the carbon dioxide entering the energy storage circuit 13 can be matched with the working temperature of the compressor 1321 in the energy storage circuit 13. Specifically, when the temperature of the carbon dioxide in the gas storage 11 is lower than the first preset temperature (for example, during winter), the first fan 16 is started, and when the carbon dioxide flows through the first cold aisle 122, the heat of the air in the underground mine 200 flowing through the first hot aisle 121 can be absorbed, so that the temperature of the carbon dioxide entering the energy storage loop 13 can be increased, the efficiency of the carbon dioxide energy storage system 100 can be improved, the influence of the floating of the carbon dioxide temperature in the gas storage 11 along with the seasonal variation on the efficiency of the carbon dioxide energy storage system 100 can be reduced, and the carbon dioxide energy storage system 100 can stably operate throughout the year. It should be noted that the first preset temperature is a temperature of air in the underground mine 200, and the first preset temperature may be above 10 ℃. The embodiment can fully utilize the energy of constant-temperature air flow in the underground space of the abandoned mine, realize the reutilization of space and energy, improve the running stability of the carbon dioxide energy storage system, reduce the running energy consumption of the carbon dioxide energy storage system and save energy.

In some embodiments, control valves (not numbered) may be provided at the inlet of the gas storage 11, the outlet of the gas storage 11, the inlet of the liquid storage tank 14, and the outlet of the liquid storage tank 14 to control the on and off of carbon dioxide flow in the carbon dioxide energy storage system 100.

Further, the preheater 12 itself has a heating function, and when the temperature of the carbon dioxide cannot be matched with the rated temperature of the compressor 1321 in the energy storage circuit 13 by only absorbing the heat of the air flowing through the first heat channel 121, the heating function of the preheater 12 itself can be started to further heat the carbon dioxide flowing through the first cold channel 121, so that the temperature of the carbon dioxide is matched with the rated temperature of the compressor 1321 in the energy storage circuit 13.

Further, the first fan 16 is disposed between the underground mine 200 and the first thermal passage 121. Specifically, one end of the first fan 16 is connected to the underground mine 200, the other end of the first fan 16 is connected to the inlet of the first heat tunnel 121, and the first fan 16 drives air in the underground mine 200 to flow through the first heat tunnel 121 and then flow out from the outlet of the first heat tunnel 121.

Further, referring to fig. 1, a control valve (not numbered) may be provided between the underground mine 200 and the first fan 16 to control the on and off of the air flow in the underground mine 200.

In some embodiments, referring to fig. 2, the first fan 16 may not be disposed between the underground mine 200 and the first heat channel 121, specifically, the inlet of the first heat channel 121 is in communication with the underground mine 200, one end of the first fan 16 is in communication with the outlet of the first heat channel 121, and the other end of the first fan 16 is in communication with the outside.

Further, referring to fig. 2, a control valve (not numbered) may be further provided between the underground mine 200 and the first heat tunnel 121 to control the on and off of the air flow in the underground mine 200.

In some embodiments, referring to fig. 3, the preheater 12 is disposed at the wellhead of the underground mine 200, and the preheater 12 covers the wellhead of the underground mine 200, one end of the first heat channel 121 of the preheater 12 is communicated with the wellhead of the underground mine 200, one end of the first fan 16 is communicated with the outlet of the first heat channel 121, the other end of the first fan 16 is communicated with the outside, and the first fan 16 can drive air in the underground mine 200 into the first heat channel 121 and then exhaust the air out of the outside through the first fan 16. In the present embodiment, by providing the preheater 12 at the wellhead of the underground mine 200, the pipe that leads the air in the underground mine 200 out to the first heat tunnel 121 is shortened, which is advantageous in saving the pipe cost and reducing the heat loss generated by the air in the underground mine 200 flowing through the pipe.

Further, referring to fig. 3, a control valve (not numbered) may be further disposed between the first fan 16 and the first heat channel 121 to control the on and off of the air flow in the underground mine 200.

In some embodiments, referring to fig. 1, the first thermal pathway 121 is sealingly connected to the outlet of the underground mine 200, or alternatively, the first blower 16 is sealingly connected to the outlet of the underground mine 200, such that when the first blower 16 is activated, air within the underground mine 200 may be driven into the first thermal pathway 121.

In some embodiments, the first thermal channel 121 may not form a sealing connection with the outlet of the underground mine 200, specifically referring to fig. 4, the carbon dioxide energy storage system 100 further includes a first gas pipe 17, one end of the first gas pipe 17 is communicated with the inlet of the first thermal channel 121, the other end of the first gas pipe 17 extends into the bottom of the underground mine 200 and extends at the bottom of the underground mine 200, the portion of the first gas pipe 17 extending into the underground mine 200 is further provided with a plurality of first air inlets 171 at intervals, and when the first fan 16 is started, air in the underground mine 200 enters the first gas pipe 17 from the first air inlets 171 and then flows through the first thermal channel 121 to be discharged outside. In winter, the temperature of the air near the bottom of the underground mine 200 is higher than the temperature of the air near the wellhead, so in this embodiment, by providing the first gas pipe 17, the air with higher temperature at the bottom of the underground mine 200 can be driven into the first thermal channel 121, thereby improving the efficiency of the carbon dioxide energy storage system.

In some embodiments, the carbon dioxide energy storage system 100 further comprises a first temperature detector (not shown) mounted in the gas storage 11 at the inlet of the energy storage circuit 13 or in the gas storage 11 for detecting the temperature of the carbon dioxide entering the energy storage circuit 13. When the temperature of the carbon dioxide entering the energy storage circuit 13 is lower than the temperature of the air in the underground mine 200, the carbon dioxide can flow through the first cold aisle 122 and absorb the heat of the air in the underground mine 200 flowing through the first hot aisle 121, so that the temperature of the carbon dioxide entering the energy storage circuit 13 can be increased, and the efficiency of the energy storage system 100 can be improved.

When the temperature of the carbon dioxide entering the energy storage loop 13 is smaller than the first preset temperature, the first fan 16 can be started, at this time, when the carbon dioxide at normal temperature and normal pressure in the gas storage 11 flows through the first cold channel 122, the carbon dioxide absorbs heat in the first hot channel 121 and enters the energy storage loop 13, the energy storage loop 13 compresses and condenses the carbon dioxide into liquid, the liquid carbon dioxide is stored in the liquid storage tank 14, and the liquid carbon dioxide in the liquid storage tank 14 forms the carbon dioxide at normal temperature and normal pressure after expansion work of the energy release loop 15 and flows into the gas storage 11. When the temperature of the carbon dioxide in the gas storage 11 is greater than or equal to the first preset temperature, the first fan 16 may be turned off, at this time, the carbon dioxide does not need to exchange heat with the air flowing through the first heat channel 121 when flowing through the first cold channel 122, and directly flows into the energy storage loop 13, the energy storage loop 13 compresses and condenses the carbon dioxide into liquid, and then the liquid carbon dioxide is stored in the liquid storage tank 14, and the liquid carbon dioxide in the liquid storage tank 14 is stored in the gas storage 11 after being expanded by the energy release loop 15 to do work. In this embodiment, when the temperature of the carbon dioxide entering the energy storage circuit 13 is lower than the first preset temperature, the first fan 16 may be started to enable the carbon dioxide passing through the first cold channel 122 to absorb the heat of the air flowing through the first hot channel 121 and then enter the energy storage circuit 13, so as to raise the temperature of the carbon dioxide entering the energy storage circuit 13, thereby being beneficial to enabling the temperature of the carbon dioxide to reach the rated temperature of the compressor 1321 in the energy storage circuit 13, and ensuring that the compressor 1321 in the energy storage circuit 13 can compress the carbon dioxide.

The carbon dioxide after expansion work from the energy release loop 15 flows into the gas storage 11 and can only dissipate heat in the atmosphere, and in summer, the ambient temperature is high, the temperature of the carbon dioxide in the gas storage 11 can also rise, and even in extreme high-temperature weather, the temperature of the gas stored in the accommodating cavity of the gas storage 11 can exceed the design temperature condition of the inner membrane, so that the safety risks such as rupture of the gas storage 11 exist. Thus, referring to fig. 5, the carbon dioxide energy storage system 100 further includes a second fan 18 and a heat exchanger 19, where the heat exchanger 19 is provided with a second hot channel 191 and a second cold channel 192, and the gas storage 11, the first cold channel 122, the energy storage loop 13, the liquid storage tank 14, the energy release loop 15, and the second hot channel 191 are sequentially connected to form a closed loop. The second fan 18 is in communication with the second cold aisle 192, the second fan 18 is also in communication with the underground mine 200, and the second fan 18 is configured to drive air in the underground mine 200 to flow into the second cold aisle 192 to cool the carbon dioxide flowing through the second hot aisle 191. When the carbon dioxide after expanding and releasing energy through the energy releasing loop 15 flows through the second heat channel 191, the carbon dioxide can absorb the cold energy of the air flowing through the second cold channel 192, so that the carbon dioxide can flow into the air storage 11 after being cooled, the influence of the environment on the temperature of the carbon dioxide after expanding and acting of the energy releasing loop 15 in summer is reduced, the carbon dioxide energy storage system 100 can stably operate throughout the year, and the temperature of the carbon dioxide flowing into the air storage 11 can be lower than the design temperature of the air storage 11 in extreme high temperature in summer, so that the safety of the air storage 11 is improved.

A second temperature sensor (not shown) may also be provided at the outlet of the energy release circuit 15 for detecting the temperature of the carbon dioxide exiting the energy release circuit 15. When the temperature of the carbon dioxide flowing out of the energy release loop 15 is higher than the second preset temperature, the second fan 18 can be started, and at this time, when the carbon dioxide expanded and acting from the energy release loop 15 passes through the second hot channel 191, the cold energy of the air flowing through the second cold channel 192 is absorbed and flows into the air storage 11, so that the high-temperature carbon dioxide is prevented from directly entering the air storage 11, and the safety risk caused by the fact that the temperature of the carbon dioxide in the air storage 11 is higher than the design temperature of the air storage 11 is prevented. When the temperature of the carbon dioxide flowing out of the energy release circuit 15 is lower than or equal to the second preset temperature, the second fan 18 may be turned off, and at this time, the carbon dioxide expanded from the energy release circuit 15 does not exchange heat with the air in the second cold channel 192 when flowing through the second hot channel, and directly flows into the air storage 11. Wherein the second preset temperature may be 40 ℃ or less, and illustratively, the second preset temperature may be the temperature of the air in the underground mine 200. When the temperature of the carbon dioxide after the expansion work of the energy release loop 15 is higher than the second preset temperature, the second fan 18 is started to enable the carbon dioxide after the expansion work of the energy release loop 15 to flow into the gas storage 11 after being cooled in the second cold channel 192, so that the influence of the environment on the temperature of the carbon dioxide after the expansion work of the energy release loop 15 in summer is reduced, the carbon dioxide energy storage system 100 can stably operate throughout the year, and the temperature of the carbon dioxide flowing into the gas storage 11 can be lower than the design temperature of the gas storage 11 in extreme high temperature in summer, and the safety of the gas storage 11 is improved.

It should be noted that, referring to fig. 5, when the carbon dioxide energy storage system 100 is disposed near the underground mine 200 with warmth in winter and cool in summer, the preheater 12, the first fan 16, the heat exchanger 19 and the second fan 18 may be disposed in the carbon dioxide energy storage system 100 at the same time, so that the first fan 16 may be started and the second fan 18 may be turned off when the temperature of the carbon dioxide in the air storage 11 is lower than the first preset temperature in the energy storage stage, so that the carbon dioxide absorbs the heat of the air flowing through the first hot channel 121 when flowing through the first cold channel 122, and the temperature of the carbon dioxide is raised and then enters the energy storage loop 13; in the energy release stage, when the temperature of the carbon dioxide in the air storage 11 is higher than the second preset temperature, the second fan 18 can be started and the first fan 16 can be closed, so that the carbon dioxide after the energy release loop 15 expands and works can transfer heat to the air flowing through the second cold channel 192 when flowing through the second hot channel 191, and the carbon dioxide flows into the air storage 11 for storage after being cooled. It should be noted that, when the carbon dioxide energy storage system 100 is disposed in the underground mine 200 kept at a high temperature throughout the year, only the preheater 12 and the first fan 16 are required to be disposed in the carbon dioxide energy storage system 100, so that when the temperature of the carbon dioxide in the air storage 11 is lower than the first preset temperature, the carbon dioxide can absorb the heat of the air flowing through the first hot channel 121 when flowing through the first cold channel 122, and the carbon dioxide is further raised in temperature and then enters the energy storage circuit 13.

In some embodiments, referring to fig. 5, the second fan 18 is disposed between the underground mine 200 and the second cold aisle 192. Specifically, one end of the second fan 18 is communicated with the underground mine 200, the other end of the second fan 18 is communicated with the inlet of the second cold channel 192, the outlet of the second cold channel 192 is communicated with the outside, when the second fan 18 is started, the second fan 18 drives the low-temperature air in the underground mine 200 to absorb the heat of the carbon dioxide flowing through the second hot channel 191 when the low-temperature air flows through the second cold channel 192, and then the heat flows out of the outside from the outlet of the second cold channel 192.

Further, referring to fig. 5, a control valve (not numbered) may be provided between the underground mine 200 and the second fan 18 to control the turning on and off of the air flow in the underground mine 200.

In some embodiments, the second fan 18 may not be disposed between the underground mine 200 and the second cold aisle 192. Specifically, referring to fig. 6, the inlet of the second cooling channel 192 is communicated with the underground mine 200, one end of the second fan 18 is communicated with the outlet of the second cooling channel 192, the other end of the second fan 18 is communicated with the outside, and when the second fan 18 is started, the second fan 18 drives the low-temperature air in the underground mine 200 to absorb the heat of the carbon dioxide flowing through the second hot channel 191 when flowing through the second cooling channel 192, and then flows out of the outside from the other end of the second fan 18.

Further, referring to fig. 6, a control valve (not numbered) may be further provided between the underground mine 200 and the second cold aisle 192 to control the turning on and off of the air flow in the underground mine 200.

In some embodiments, referring to fig. 7, the heat exchanger 19 is disposed at the wellhead of the underground mine 200, and the heat exchanger 19 covers the wellhead of the underground mine 200, the inlet of the second cooling passage 192 of the heat exchanger 19 communicates with the wellhead of the underground mine 200, one end of the second fan 18 communicates with the outlet of the second cooling passage 192, the other end of the second fan 18 communicates with the outside, when the second fan 18 is started, the low-temperature air in the underground mine 200 enters the second cooling passage 192 and absorbs the heat of the carbon dioxide flowing through the second hot passage 191, and then the air in the second cooling passage 192 is discharged outside through the second fan 18. In the present embodiment, by providing the heat exchanger 19 at the wellhead of the underground mine 200, the pipe that leads the air in the underground mine 200 out to the second cold passage 192 is shortened, which is advantageous in saving the pipe cost and reducing the heat loss generated by the air in the underground mine 200 flowing through the pipe.

Further, referring to fig. 7, a control valve (not numbered) may be provided between the second fan 18 and the second cooling passage 192 to control the on and off of the air flow in the underground mine 200.

It should be noted that referring to fig. 7, the underground mine 200 may be provided with a plurality of wellheads, the preheater 12 is provided at one of the wellheads, and the heat exchanger 19 is provided at the other wellhead.

In some embodiments, referring to fig. 6, the second cold aisle 192 is sealingly connected to an outlet of the underground mine 200, or alternatively, the second fan 18 is sealingly connected to an outlet of the underground mine 200, such that when the second fan 18 is activated, air within the underground mine 200 may be driven into the second cold aisle 192.

In some embodiments, the second cold aisle 122 may not form a sealed connection with the outlet of the underground mine 200, and in particular, referring to fig. 8 and 9, the carbon dioxide energy storage system 100 further includes a second gas duct 22, one end of the second gas duct 22 is in communication with the inlet of the second cold aisle 122, the other end of the second gas duct 22 extends into the bottom of the underground mine 200 and extends at the bottom of the underground mine 200, and a plurality of second air inlets 221 are spaced apart from the portion of the second gas duct 22 extending into the underground mine 200, and when the second fan 18 is activated, air in the underground mine 200 enters the second gas duct 22 from the second air inlets 221 of the second gas duct 22 and then flows through the second cold aisle 122 to be discharged outside. In summer, the temperature of the air near the bottom of the underground mine 200 is lower than that near the wellhead, so in this embodiment, by providing the second gas pipeline 22 and the second gas inlet 221 thereof, the air with lower temperature at the bottom of the underground mine 200 is driven to enter the second cold channel 192, which is beneficial to further reducing the temperature of the carbon dioxide entering the gas storage 11, improving the heat exchange effect of the heat exchanger 19 and enabling the carbon dioxide energy storage system 100 to stably operate throughout the year.

In some embodiments, referring to fig. 8, an underground mine 200 includes a wellbore 201 and an underground tunnel 202, the underground tunnel 202 communicating with a bottom of the wellbore 201, a first gas conduit 17 extending through the wellbore 201 into the underground tunnel 202, and extending in the underground tunnel 202. The second gas conduit 22 extends through the wellbore 201 into the underground roadway 202 and extends within the underground roadway 202. The distance between the underground tunnel 202 and the ground is generally more than 100 meters, so that the air temperature in the underground tunnel 202 varies less with seasons, and the air temperature in the underground tunnel 202 tends to be lower than the air temperature on the ground in summer so that the air in the underground tunnel 202 can absorb heat of the carbon dioxide flowing through the second hot passage 191 while flowing through the second cold passage 192, and the air temperature in the underground tunnel 202 tends to be higher than the air temperature on the ground in winter so that the air in the underground tunnel 202 can transfer heat to the carbon dioxide flowing through the first cold passage 122 while flowing through the first hot passage 121.

In some embodiments, the energy storage circuit 13 includes a condenser 131 and at least one compressed energy storage portion 132, the compressed energy storage portion 132 including a compressor 1321 and an energy storage heat exchanger 1322. When the number of the compressed energy storage parts 132 is one, the outlet of the gas storage 11 is communicated with the inlet of the compressor 1321, the outlet of the compressor 1321 is communicated with the inlet of the energy storage heat exchanger 1322, the outlet of the energy storage heat exchanger 1322 is communicated with the condenser 131, and the condenser 131 is also communicated with the inlet of the liquid storage tank 14. The compressor 1321 is used for compressing gaseous carbon dioxide, the energy storage heat exchanger 1322 is used for absorbing heat generated during compression of the gaseous carbon dioxide to cool the carbon dioxide, and the condenser 131 is used for condensing the gaseous carbon dioxide into a liquid state. When the first fan 18 is started, the energy storage process of the carbon dioxide energy storage system 100 is as follows: the gaseous carbon dioxide in the gas storage 11 at normal temperature and normal pressure is absorbed by the heat of the air flowing through the first hot channel 121 when passing through the first cold channel 122, then enters the compressor 1321 to be compressed, the compressed gaseous carbon dioxide enters the energy storage heat exchanger 1322 to release heat, then the released gaseous carbon dioxide enters the condenser 131 to be condensed into liquid carbon dioxide, and the liquid carbon dioxide enters the liquid storage tank 14 to be stored. Because the compressor 1321 needs to consume electric energy during operation, the energy storage process of the energy storage system 100 can be performed in the electricity consumption low-valley period, so that the surplus electric energy in the power grid can be supplied to the compressor 1321 for use, and the electric energy waste of the power grid in the electricity consumption low-valley period is reduced. When the number of the compression accumulator 132 is plural, the plural compressors 1321 and the plural accumulator heat exchangers 1322 are alternately connected in sequence, and the outlet of the gas storage 11 is communicated with the inlet of the compressor 1321 at the beginning, and the accumulator heat exchanger 1322 at the end is connected with the condenser 131. By compressing gaseous carbon dioxide multiple times using a plurality of compressors 1321, the compression ratio of gaseous carbon dioxide can be increased.

In some embodiments, the energy release circuit 15 includes an evaporator 151 and at least one expansion energy release portion 152, the expansion energy release portion 152 including an energy release heat exchanger 1522 and an expander 1521. The inlet of the evaporator 151 is communicated with the outlet of the liquid storage tank 14, when the number of the expansion energy release parts 152 is one, the outlet of the evaporator 151 is communicated with the inlet of the energy release heat exchanger 1522, the inlet of the expander 1521 is communicated with the outlet of the energy release heat exchanger 1522, and the outlet of the inlet expander 1521 of the second thermal channel 191 is communicated. The evaporator 151 is used for evaporating liquid carbon dioxide into a gaseous state, the energy release heat exchanger 1522 is used for providing heat for the carbon dioxide, and the expander 1521 is used for generating electricity. When the second fan 18 is activated, the energy release process of the carbon dioxide energy storage system 100 is: the liquid carbon dioxide in the liquid storage tank 14 enters the evaporator 151 to be evaporated into high-pressure gaseous carbon dioxide, the high-pressure gaseous carbon dioxide enters the energy release heat exchanger 1522 to absorb heat to form high-temperature high-pressure carbon dioxide, the high-temperature high-pressure carbon dioxide enters the expander 1521 to expand and do work, the expander 1521 drives the generator to generate electricity, the pressure and the temperature of the carbon dioxide flowing out of the expander 1521 are reduced, and then the carbon dioxide flows into the gas storage 11 through the second heat channel 191, wherein the air in the underground roadway 202 can absorb the heat of the carbon dioxide flowing through the second heat channel 191 when flowing through the second cold channel 192, so that the temperature of the carbon dioxide is further reduced to the design temperature of the gas storage 11, and the safety of the gas storage 11 is improved. The generator can be connected with the power grid, so that the generator can provide electric energy for the power grid in the power utilization peak time period, and the power supply pressure of the power grid in the power utilization peak time period can be relieved. When the number of the expansion energy release parts 152 is plural, the plural energy release heat exchangers 1522 are alternately connected with the plural expansion machines 1521 in turn, and the inlet of the energy release heat exchanger 1522 at the start end is communicated with the evaporator 151, and the inlet of the second heat passage 191 is communicated with the outlet of the expansion machine 1521 at the end. By providing a plurality of expanders 1521, the pressure potential energy stored in the carbon dioxide can be converted into electric energy as much as possible, thereby improving the energy storage efficiency of the energy storage system 100 and reducing the pressure energy waste of the carbon dioxide.

In some embodiments, referring to fig. 10, the carbon dioxide energy storage system 100 further includes a heat exchange assembly 23, where the heat exchange assembly 23 includes a cold storage tank 231 and a heat storage tank 232, heat exchange mediums are disposed in the cold storage tank 231 and the heat storage tank 232, and the cold storage tank 231 and the heat storage tank 232 form a heat exchange circuit (not numbered) between the energy storage circuit 13 and the energy release circuit 15, and the heat exchange mediums can flow in the heat exchange circuit. Specifically, the cold storage tank 231, the energy storage heat exchanger 1322, the heat storage tank 232, and the energy release heat exchanger 1522 are sequentially connected end to form a closed loop, thereby forming the heat exchange circuit described above. In the energy storage process of the carbon dioxide energy storage system 100, the heat exchange medium absorbs the heat in the energy storage heat exchanger 1322 to form a high-temperature heat exchange medium when flowing through the energy storage heat exchanger 1322 from the cold storage tank 231, and then the heat exchange medium flows into the heat storage tank 232 for storage, so that the energy generated when the carbon dioxide in the energy storage heat exchanger 1322 is compressed by the compressor 1321 is transferred into the heat exchange assembly 23. During the energy release process of the carbon dioxide energy storage system 100, the heat exchange medium flows into the energy release heat exchanger 1522 from the heat storage tank 232, so that the carbon dioxide flowing through the energy release heat exchanger 1522 can absorb the heat temporarily stored in the heat exchange medium in the heat exchange assembly 23, and then the heat exchange medium flows into the cold storage tank 231 for storage, thereby forming the circulation flow of the heat exchange medium in the heat exchange loop. In this embodiment, by arranging the cold storage tank 231 and the heat storage tank 232, and connecting the cold storage tank 231, the energy storage heat exchanger 1322, the heat storage tank 232 and the energy release heat exchanger 1522 end to end in sequence to form a heat exchange loop, when the heat exchange medium flows in the heat exchange loop, the heat of the compressed gaseous carbon dioxide in the energy storage heat exchanger 1322 can be transferred to the gaseous carbon dioxide in the energy release heat exchanger 1522, so that the heat generated when the carbon dioxide is compressed is fully utilized, and the waste of energy is reduced.

In the embodiment of the invention, in winter, when the temperature in the abandoned mines with a plurality of widely distributed coal mines, iron ores and copper ores is higher than the temperature of the carbon dioxide in the gas storage, the first fan 16 drives the high-temperature air in the underground mine 200 to enter the first hot channel 121 and then to be discharged outside, and the carbon dioxide flowing out of the gas storage 11 can absorb the heat of the air in the first hot channel 121 when passing through the first cold channel 122, so that the temperature of the carbon dioxide entering the energy storage loop 13 is increased, the temperature of the carbon dioxide can reach the rated temperature of the compressor 1321 in the energy storage loop 13, the efficiency of the carbon dioxide energy storage system 100 is improved, and the external heat supply is reduced.

The present invention provides another embodiment of a method for reducing carbon dioxide temperature drift, which is applied to the carbon dioxide energy storage system 100, and the method for reducing carbon dioxide temperature drift comprises,

when the temperature of the carbon dioxide in the gas storage 11 is lower than a first preset temperature, the first fan 16 is turned on to drive the air in the underground mine 200 to flow into the first heat channel 121, the carbon dioxide flowing through the first cold channel 122 absorbs heat and then enters the energy storage loop 13, and the energy storage loop 13 compresses and condenses the carbon dioxide into a liquid state and then stores the liquid state in the liquid storage tank 14; and/or the number of the groups of groups,

When the temperature of the carbon dioxide in the air storage 11 is higher than the second preset temperature, the second fan 18 is turned on to drive the air in the underground mine 200 to flow into the second cold channel 192, and the carbon dioxide flowing through the second hot channel 191 absorbs the cold energy of the air in the second cold channel 192 to cool and then flow into the air storage 11 for storage.

In this embodiment, when the temperature of the carbon dioxide in the air storage 11 is lower than the first preset temperature in winter, the temperature of the carbon dioxide can be adapted to the rated operating temperature of the compressor 1321 by starting the first fan 16 to enable the carbon dioxide flowing through the first cold channel 122 to absorb the heat of the air flowing through the first hot channel 121 and then enter the compressor 1321. When the temperature of the gaseous carbon dioxide at the outlet of the expander 1521 is higher than the second preset temperature in summer, the second fan 18 is started to cool the carbon dioxide flowing through the second thermal channel 191 and then flow into the gas storage 11, so that the temperature of the carbon dioxide is reduced to be matched with the rated working temperature of the compressor 1321, and the normal operation of the compressor 1321 is ensured.

Referring to fig. 11, the carbon dioxide energy storage system 300 includes: the energy storage device comprises an air storage 11, an energy storage loop 13, an energy storage tank 14, an energy release loop 15, a second fan 18 and a heat exchanger 19. The heat exchanger 19 is provided with a second hot channel 191 and a second cold channel 192, and the gas storage 11, the energy storage circuit 13, the liquid storage tank 14, the energy release circuit 15 and the second hot channel 191 are sequentially connected to form a closed loop. The second fan 18 is in communication with the second cold aisle 192, the second fan 18 is also in communication with the underground mine 200, and the second fan 18 is configured to drive air in the underground mine 200 to flow into the second cold aisle 192 to cool the carbon dioxide flowing through the second hot aisle 191. When the carbon dioxide after expanding and releasing energy through the energy releasing loop 15 flows through the second heat channel 191, the carbon dioxide can absorb the cold energy of the air flowing through the second cold channel 192, so that the carbon dioxide can flow into the air storage 11 after being cooled, the influence of the environment on the temperature of the carbon dioxide after expanding and acting of the energy releasing loop 15 in summer is reduced, the carbon dioxide energy storage system 100 can stably operate throughout the year, and the temperature of the carbon dioxide flowing into the air storage 11 can be lower than the design temperature of the air storage 11 in extreme high temperature in summer, so that the safety of the air storage 11 is improved.

In this embodiment, when the temperature of the carbon dioxide flowing out of the energy release circuit 15 is higher than the second preset temperature, the second fan 18 is started to transfer heat to the air flowing through the second cold channel 192 when the carbon dioxide passes through the second hot channel 191, and then the heat flows into the air storage 11, so that the high-temperature carbon dioxide can be prevented from directly entering the air storage 11, and the safety risk caused by that the temperature of the carbon dioxide in the air storage 11 is higher than the design temperature of the air storage 11 can be prevented.

In some embodiments, referring to fig. 12, the heat exchanger 19 is disposed at the wellhead of the underground mine 200, and the heat exchanger 19 covers the wellhead of the underground mine 200, the inlet of the second cooling passage 192 of the heat exchanger 19 is communicated with the wellhead of the underground mine 200, one end of the second fan 18 is communicated with the outlet of the second cooling passage 192, the other end of the second fan 18 is communicated with the outside, when the second fan 18 is started, the low-temperature air in the underground mine 200 enters the second cooling passage 192 and absorbs the heat of the carbon dioxide flowing through the second hot passage 191, and then the air in the second cooling passage 192 is discharged out of the outside through the second fan 18. In the present embodiment, by providing the heat exchanger 19 at the wellhead of the underground mine 200, the pipe that leads the air in the underground mine 200 out to the second cold passage 192 is shortened, which is advantageous in saving the pipe cost and reducing the heat loss generated by the air in the underground mine 200 flowing through the pipe.

The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.

Claims (10)

1. The carbon dioxide energy storage system is characterized by comprising an air storage, a preheater, an energy storage loop, a liquid storage tank, an energy release loop and a first fan;

the preheater is provided with a first hot channel and a first cold channel, the gas storage warehouse, the first cold channel, the energy storage loop, the liquid storage tank and the energy release loop are sequentially connected to form a closed loop, the first fan is communicated with the first hot channel and is also communicated with an underground mine, and the first fan is used for driving air in the underground mine to enter the first hot channel so as to provide heat for carbon dioxide flowing through the first cold channel.

2. The carbon dioxide energy storage system of claim 1, wherein the carbon dioxide energy storage system comprises,

one end of the first fan is communicated with the underground mine, and the other end of the first fan is communicated with the inlet of the first heat channel;

Or,

one end of the first fan is connected with the outlet of the first heat channel, and the other end of the first fan is communicated with the outside;

or,

the preheater is arranged at the wellhead of the underground mine, the wellhead of the underground mine is covered by the preheater, the inlet of the first heat channel is communicated with the wellhead of the underground mine, one end of the first fan is communicated with the outlet of the first heat channel, and the other end of the first fan is communicated with the outside.

3. The carbon dioxide energy storage system of claim 1, wherein the carbon dioxide energy storage system comprises,

the carbon dioxide energy storage system further comprises a first gas pipeline, the first gas pipeline at least partially stretches into the underground mine, the first gas pipeline is further communicated with the first heat channel, and the first fan is used for driving air in the underground mine to enter the first heat channel through the first gas pipeline.

4. The carbon dioxide energy storage system of claim 1, wherein the carbon dioxide energy storage system comprises,

the carbon dioxide energy storage system further comprises a second fan and a heat exchanger, wherein the heat exchanger is provided with a second cold channel and a second hot channel, the gas storage warehouse, the first cold channel, the energy storage loop, the liquid storage tank, the energy release loop and the second hot channel are sequentially connected to form a closed loop, the second fan is communicated with the second cold channel, the second fan is further communicated with an underground mine, and the second fan is used for driving air in the underground mine to flow into the second cold channel so as to cool carbon dioxide flowing through the second hot channel.

5. The carbon dioxide energy storage system of claim 4, wherein the carbon dioxide energy storage system comprises,

one end of the second fan is communicated with the underground mine, the other end of the second fan is communicated with the inlet of the second cold channel, and the outlet of the second cold channel is communicated with the outside;

or,

the inlet of the second cooling channel is communicated with the underground mine, one end of the second fan is communicated with the outlet of the second cooling channel, and the other end of the second fan is communicated with the outside;

or,

the heat exchanger is arranged at the wellhead of the underground mine, the heat exchanger covers the wellhead of the underground mine, the inlet of the second cooling channel is communicated with the wellhead of the underground mine, one end of the second fan is communicated with the outlet of the second cooling channel, and the other end of the second fan is communicated with the outside.

6. The carbon dioxide energy storage system of claim 4, wherein the carbon dioxide energy storage system comprises,

the carbon dioxide energy storage system further comprises a second gas pipeline, the second gas pipeline at least partially stretches into the underground mine, the second gas pipeline is further communicated with the second cold channel, and the second fan is used for driving air in the underground mine to enter the second cold channel through the second air entraining channel.

7. A carbon dioxide energy storage system according to claim 3, wherein,

the underground mine comprises a shaft and an underground tunnel, the bottom of the shaft is communicated with the underground tunnel, the first gas pipeline part penetrates through the shaft and then stretches into the underground tunnel, the first gas pipeline is provided with an air inlet, and air in the underground tunnel can enter the first gas pipeline from the air inlet.

8. The carbon dioxide energy storage system of claim 1, wherein the carbon dioxide energy storage system comprises,

the carbon dioxide energy storage system further comprises a third fan, the gas storage warehouse is in sealing connection with the inlet of the underground mine, the third fan is connected with the outlet of the underground mine, and the third fan is used for pumping out air in the underground mine when the carbon dioxide energy storage system is in an initial state.

9. The carbon dioxide energy storage system is characterized by comprising an air storage warehouse, an energy storage loop, a liquid storage tank, an energy release loop, a heat exchanger and a second fan;

the gas storage, the first cold channel, the energy storage loop, the liquid storage tank, the energy release loop and the second hot channel are sequentially connected to form a closed loop, the second fan is communicated with the second cold channel and is also communicated with the underground mine, and the second fan is used for driving air in the underground mine to flow into the second cold channel so as to cool carbon dioxide flowing through the second hot channel.

10. A method for reducing the temperature drift of carbon dioxide, applied to a carbon dioxide energy storage system according to any one of claims 1-9,

when the temperature of the carbon dioxide in the gas storage is lower than a first preset temperature, the first fan is turned on to drive air in the underground mine to flow into the first heat channel, the carbon dioxide flowing through the first cold channel absorbs heat and then enters the energy storage loop, and the energy storage loop compresses and condenses the carbon dioxide into liquid and then stores the liquid in the liquid storage tank;

and/or the number of the groups of groups,

when the temperature of the carbon dioxide in the gas storage is higher than a second preset temperature, the second fan is turned on to drive the air in the underground mine to flow into the second cold channel, and the carbon dioxide flowing through the second hot channel absorbs the cold energy of the air in the second cold channel to cool and then flows into the gas storage for storage.