Carbon dioxide trapping device and use method thereof

Abstract

The invention discloses a carbon dioxide trapping device and a use method thereof, and belongs to the technical field of carbon dioxide trapping. Comprising a drying mechanism, a first cooling mechanism, a second cooling mechanism, a compressor, a first water supply mechanism, a gas-liquid separator, a second water supply mechanism and gas to be treated, cooling liquid is stored in the first water supply mechanism, and the first water supply mechanism pumps the cooling liquid into the first cooling mechanism and the second cooling mechanism; hot water is stored in the second water supply mechanism, and the second water supply mechanism pumps the hot water into the first cooling mechanism and the second cooling mechanism; according to the carbon dioxide trapping device and the using method thereof, the purpose of separating carbon dioxide from to-be-treated gas in a liquid state can be achieved, and meanwhile the purpose of preventing pipelines in the first cooling mechanism and the second cooling mechanism from being blocked by frozen water vapor can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of carbon dioxide capture, and in particular to a carbon dioxide capture device and a use method thereof. Background Art

[0002] Global warming is a serious environmental problem that humans are currently facing. The extreme weather and rising sea levels caused by it seriously threaten the normal production and life of humans. Carbon dioxide is a major greenhouse gas. In recent years, with the rapid development of industry, the increasing consumption of fossil fuels has led to an increase in the carbon dioxide content in the atmosphere year by year. Industrial waste gas contains a large amount of carbon dioxide. In order to reduce the impact of carbon dioxide on the climate, on the one hand, it is necessary to vigorously promote energy-saving and emission reduction technologies to reduce carbon dioxide emissions from the source; on the other hand, it is necessary to strengthen the resource utilization of carbon dioxide and turn waste into treasure. Carbon dioxide needs to be captured and processed, so carbon dioxide capture equipment is needed.

[0003] For example, a carbon dioxide capture device with Chinese publication number CN117582808B includes a tower-shaped tank body, the left side of the outer surface of the tower-shaped tank body is fixedly connected to a right-angle airway, a servo motor is installed on the left side of the outer surface of the gearbox, a shift plate is fixedly connected to the bottom of the outer surface of the rotating shaft, an auxiliary component is arranged near the shift plate on the outer surface of the rotating shaft, a connecting disk is fixedly connected to the center of the outer surface of the rotating shaft, a conical interception net is fixedly connected to the edge of the outer surface of the connecting disk, a right-angle rod is fixedly connected to the top of the connecting disk, the outer cylindrical surface of the rotating shaft is rotatably connected to the center of the disk, a rotating ring is rotatably connected to the bottom of the disk, a trumpet bucket is fixedly connected to the bottom of the rotating ring, and a through hole is connected to the trumpet bucket. The carbon dioxide capture device achieves the effect of rapid capture, can reduce the influence of flue gas heat, and allows the flue gas to fully contact with ammonia water, so as to fully capture carbon dioxide; However, the existing treatment method is to capture carbon dioxide, transport it to a designated location, and bury it deep underground, while this technical solution uses ammonia water to capture carbon dioxide, so carbon dioxide is dissolved in ammonia water. Therefore, during transportation, another technology is needed to separate ammonia water and carbon dioxide. Otherwise, ammonia water and carbon dioxide need to be transported together, resulting in part of the transportation space of a transport vehicle being occupied by ammonia water, which undoubtedly increases transportation costs. Using another technology to separate ammonia water and carbon dioxide increases the separation cost and takes up capture time.

[0004] Another example is a method for low-temperature distillation, purification and recovery of carbon dioxide, which is published in China with the publication number CN115069057B. It directly uses raw gas as a refrigerant, and uses carbon dioxide's own high-pressure throttling to provide cooling capacity. No other devices are required to provide cooling capacity, and the energy consumption is low. The process flow is simple and reliable. The raw gas enters the cooler after being compressed in the compressor; the raw gas is sent to the main heat exchanger and then enters the reboiler; the raw gas is further cooled by the reflux gas in the subcooler, and then sent to the No. 1 gas-liquid separator after being reduced in pressure and temperature by the No. 1 throttle valve; the liquid carbon dioxide condensed by the No. 1 gas-liquid separator is sent to the distillation tower as reflux liquid to participate in distillation, and the gas coming out of the No. 1 gas-liquid separator is reheated by the cooler and the main heat exchanger as the regeneration gas of the adsorber; the crude gas obtained from the distillation tower is cooled by the cooler and then enters the No. 2 gas-liquid separator; the carbon dioxide liquid obtained from the distillation tower is reduced in pressure by the No. 2 throttle valve, and then sent to the carbon dioxide product pipeline after being reheated by the cooler and the main heat exchanger; This technical solution uses a cooler and a heat exchanger to lower the temperature of carbon dioxide and increases the pressure of carbon dioxide through a compressor. However, when the gas enters the cooler or heat exchanger, if the gas is not completely dry at this time, the moisture contained in it may freeze due to the decrease in temperature and block the pipes of the cooler or heat exchanger, resulting in the cooler or heat exchanger being unable to discharge the gas, thereby affecting the capture of carbon dioxide. Summary of the invention

[0005] The object of the present invention is to provide a carbon dioxide capture device and a method of using the same to solve the problems raised in the above background technology.

[0006] In view of the above problems, the technical solution proposed by the present invention is: A carbon dioxide capture device comprises a drying mechanism, a first cooling mechanism, a second cooling mechanism, a compressor, a first water supply mechanism, a gas-liquid separator, a second water supply mechanism, and a gas to be treated, wherein the first water supply mechanism stores a coolant, and the first water supply mechanism pumps the coolant into the first cooling mechanism and the second cooling mechanism, the second water supply mechanism stores hot water, and the second water supply mechanism pumps the hot water into the first cooling mechanism and the second cooling mechanism, the first cooling mechanism and the second cooling mechanism discharge the liquid in the first cooling mechanism and the second cooling mechanism, and the gas to be treated flows through the drying mechanism, the first cooling mechanism, the compressor, the second cooling mechanism, and the gas-liquid separator in sequence.

[0007] As a preferred technical solution of the present invention, the drying mechanism includes a drying box, which is provided with a drying chamber and a heating chamber from the inside to the outside, the interior of the drying chamber is filled with an acidic desiccant, four groups of heaters are installed on the outside of the drying box, and one end of the four groups of heaters is in contact with the wall surface of the heating chamber, one side of the drying box is connected to a feed pipe through a one-way valve, and the gas to be treated enters the drying chamber through the feed pipe.

[0008] As a preferred technical solution of the present invention, the first cooling mechanism and the second cooling mechanism both include a cooling box, a pair of discharge pipes are connected between the cooling box in the first cooling mechanism and the drying box, and a sixth solenoid valve is connected between the pair of discharge pipes.

[0009] As a preferred technical solution of the present invention, a condenser is installed inside the cooling box, and a plurality of cooling fins are installed on the surface of the condenser. One end of the condenser in the first cooling mechanism is connected to one of the discharge pipes. The first cooling mechanism and the second cooling mechanism also include a first solenoid valve and a cold water pipe. The cooling box is connected to the cold water pipe through the first solenoid valve. The first water supply mechanism includes a cold water tank. The coolant is stored in the cold water tank. A pair of first pumps are installed on the outside of the cold water tank. The pair of first pumps pump the coolant into the pair of cold water pipes.

[0010] As a preferred technical solution of the present invention, the first cooling mechanism and the second cooling mechanism both include a second solenoid valve and a hot water pipe, and the cooling tank is connected to the hot water pipe through the second solenoid valve, and the second water supply mechanism includes a hot water tank, the hot water is stored in the hot water tank, an electric heating wire is installed inside the hot water tank, and a pair of second pumps are installed outside the hot water tank, and the pair of second pumps pump the hot water into the pair of hot water pipes.

[0011] As a preferred technical solution of the present invention, the first cooling mechanism and the second cooling mechanism further include a third solenoid valve and a drain pipe, and the cooling box is connected to the drain pipe through the third solenoid valve.

[0012] As a preferred technical solution of the present invention, a temperature sensor is installed inside the hot water tank, and a controller is installed outside the hot water tank. The controller is connected to the temperature sensor via an ADC converter.

[0013] As a preferred technical solution of the present invention, a pair of air inlet pipes are provided between the compressor and the first cooling mechanism, a fourth solenoid valve is connected between the pair of air inlet pipes, the free ends of the pair of air inlet pipes are respectively connected to the other end of the condenser in the first cooling mechanism and the inlet of the compressor, a pair of air outlet pipes are provided between the compressor and the second cooling mechanism, a fifth solenoid valve is connected between the pair of air outlet pipes, the free ends of the pair of air outlet pipes are respectively connected to one end of the condenser in the second cooling mechanism and the outlet of the compressor, and a conduit is connected between the other end of the condenser in the second cooling mechanism and the inlet of the gas-liquid separator.

[0014] In another aspect, the present invention provides a method for using a carbon dioxide capture device, comprising the following steps: Step 1: introduce the gas to be treated after desulfurization into the drying box, and start four sets of heaters to heat the air in the drying chamber. After the gas to be treated is dried by hot air and acidic desiccant, most of the moisture in it can be removed. While drying the gas to be treated, open one of the first solenoid valves and start one of the first pumps to allow the coolant to enter the cooling box of the first cooling mechanism. When the cooling box of the first cooling mechanism is filled with coolant, close the first solenoid valve and the first pump. Step 2, opening the sixth solenoid valve, the dry gas enters the condenser in the first cooling mechanism through a pair of discharge pipes, and exchanges heat with the coolant in the cooling box of the first cooling mechanism, thereby reducing the temperature of the gas to be treated; Step three, open the fourth solenoid valve, and the cooled gas to be treated enters the compressor through a pair of air inlet pipes, then close the fourth solenoid valve, start the compressor and open one of the third solenoid valves, so that the coolant in the cooling box of the first cooling mechanism flows out completely, and the compressor squeezes the gas to be treated to increase its pressure, when the coolant flows out completely, close one of the third solenoid valves and start one of the second pumps and one of the second solenoid valves, and at the same time start another first pump and another first solenoid valve, so that the hot water fills the cooling box of the first cooling mechanism to eliminate ice in the condenser of the first cooling mechanism, so that the coolant fills the cooling box of the second cooling mechanism, and finally close one of the second pumps and one of the second solenoid valves, another first pump and another first solenoid valve; Step 4, open the fifth solenoid valve, the high-pressure gas to be treated enters the condenser of the second cooling mechanism through a pair of gas outlet pipes, and exchanges heat with the coolant in the cooling box of the second cooling mechanism, thereby reducing the temperature of the gas to be treated again, and finally flows into the gas-liquid separator. At this time, liquefied carbon dioxide flows out from the bottom outlet of the gas-liquid separator, and the remaining gas is discharged from the top of the gas-liquid separator. At this time, open one of the third solenoid valves to make all the hot water in the cooling box of the first cooling mechanism flow out, and then close one of the third solenoid valves; Step five, open another third solenoid valve to allow all the coolant in the cooling box of the second cooling mechanism to flow out, then close the third solenoid valve, start another second pump to open another second solenoid valve, so that hot water fills the cooling box of the second cooling mechanism, close another second pump and another second solenoid valve again, so that the hot water eliminates the ice in the condenser of the second cooling mechanism, finally open the third solenoid valve again to allow all the hot water to flow out, and close the third solenoid valve again.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. The carbon dioxide capture device and the method of using the same, by changing the temperature and pressure of the gas to be treated to make it reach the critical temperature and critical pressure of carbon dioxide, i.e., 31.1 degrees Celsius and 73 atmospheres, at which time the carbon dioxide becomes liquid, and the liquid carbon dioxide and the remaining gases are separated, thereby collecting the liquid carbon dioxide, thereby achieving the purpose of improving transportation efficiency and reducing transportation costs; 2. Hot water is used to heat the condenser, so that the frozen water vapor blocked in the condenser is melted by heat, thereby ensuring the fluidity of the condenser and avoiding the situation where the frozen water vapor hinders the flow of the gas to be treated. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the structure of a carbon dioxide capture device and its use disclosed in an embodiment of the present invention; Figure 2 It is a first top cross-sectional schematic diagram of a carbon dioxide capture device disclosed in an embodiment of the present invention; Figure 3 A side cross-sectional schematic diagram of a carbon dioxide capture device disclosed in an embodiment of the present invention; Figure 4 This is a second top cross-sectional schematic diagram of the carbon dioxide capture device disclosed in an embodiment of the present invention.

[0017] In the figure: 100, drying mechanism; 1001, drying box; 1002, heater; 1003, heating chamber; 1004, drying chamber; 200, discharge pipe; 300, sixth solenoid valve; 400, first cooling mechanism; 4001, cooling box; 4002, condenser; 4003, heat dissipation fins; 4004, first solenoid valve; 4005, cold water pipe; 4006, hot water pipe; 4007, drain pipe; 500, first water supply Mechanism; 5001, cold water tank; 5002, first pump; 600, compressor; 700, air inlet pipe; 800, fourth solenoid valve; 900, air outlet pipe; 1000, fifth solenoid valve; 1100, gas-liquid separator; 1200, conduit; 1300, second water supply mechanism; 13001, hot water tank; 13002, controller; 13003, heating wire; 13004, second pump; 13005, temperature sensor. DETAILED DESCRIPTION

[0018] 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.

[0019] See also Figure 1 - Figure 4 The present invention provides a technical solution: a carbon dioxide capture device, comprising a drying mechanism 100, a first cooling mechanism 400, a second cooling mechanism, a compressor 600, a first water supply mechanism 500, a gas-liquid separator 1100, a second water supply mechanism 1300, and a gas to be treated. The first water supply mechanism 500 stores a coolant, and the first water supply mechanism 500 pumps the coolant into the first cooling mechanism 400 and the second cooling mechanism. The second water supply mechanism 1300 stores hot water, and the second water supply mechanism 1300 pumps hot water into the first cooling mechanism 400 and the second cooling mechanism. The first cooling mechanism 400 and the second cooling mechanism discharge the liquid in the first cooling mechanism 400 and the second cooling mechanism. The gas to be treated flows through the drying mechanism 100, the first cooling mechanism 400, the compressor 600, the second cooling mechanism, and the gas-liquid separator 1100 in sequence.

[0020] In one embodiment of the present invention, further, the drying mechanism 100 includes a drying box 1001, and the drying box 1001 is provided with a drying chamber 1004 and a heating chamber 1003 from the inside to the outside, the interior of the drying chamber 1004 is filled with an acidic desiccant, four groups of heaters 1002 are installed on the outside of the drying box 1001, and one end of the four groups of heaters 1002 is in contact with the wall of the heating chamber 1003, one side of the drying box 1001 is connected to a feed pipe through a one-way valve, and the gas to be treated enters the drying chamber 1004 through the feed pipe.

[0021] In one embodiment of the present invention, further, the first cooling mechanism 400 and the second cooling mechanism both include a cooling box 4001, a pair of discharge pipes 200 are connected between the cooling box 4001 in the first cooling mechanism 400 and the drying box 1001, and a sixth solenoid valve 300 is connected between the pair of discharge pipes 200.

[0022] Function An embodiment of the present invention, further, a condenser 4002 is installed inside the cooling box 4001, and a plurality of cooling fins 4003 are installed on the surface of the condenser 4002, one end of the condenser 4002 in the first cooling mechanism 400 is connected to one of the discharge pipes 200, the first cooling mechanism 400 and the second cooling mechanism also include a first solenoid valve 4004 and a cold water pipe 4005, the cooling box 4001 is connected to the cold water pipe 4005 through the first solenoid valve 4004, the first water supply mechanism 500 includes a cold water tank 5001, the coolant is stored in the cold water tank 5001, and a pair of first pumps 5002 are installed on the outside of the cold water tank 5001, and the pair of first pumps 5002 pump the coolant into the pair of cold water pipes 4005.

[0023] Specifically, the coolant is added into the cooling box 4001 from the outside.

[0024] Function An embodiment of the present invention, further, the first cooling mechanism 400 and the second cooling mechanism both include a second solenoid valve and a hot water pipe 4006, and the cooling box 4001 is connected to the hot water pipe 4006 through the second solenoid valve, the second water supply mechanism 1300 includes a hot water tank 13001, hot water is stored in the hot water tank 13001, a heating wire 13003 is installed inside the hot water tank 13001, and a pair of second pumps 13004 are installed outside the hot water tank 13001, and the pair of second pumps 13004 pump the hot water into the pair of hot water pipes 4006.

[0025] Specifically, the water in the hot water tank 13001 is added from the outside.

[0026] In one embodiment of the present invention, further, the first cooling mechanism 400 and the second cooling mechanism each include a third solenoid valve and a drain pipe 4007 , and the cooling box 4001 is connected to the drain pipe 4007 via the third solenoid valve.

[0027] In one embodiment of the present invention, further, a temperature sensor 13004 is installed inside the hot water tank 13001, and a controller 13002 is installed outside the hot water tank 13001, and the controller 13002 is connected to the temperature sensor 13005 through an ADC converter.

[0028] Specifically, the controller 13002 has a display screen for displaying the temperature monitored by the temperature sensor 13005 , so that the user can know the temperature in the hot water tank 13001 .

[0029] In accordance with an embodiment of the present invention, further, a pair of air inlet pipes 700 are provided between the compressor 600 and the first cooling mechanism 400, a fourth solenoid valve 800 is connected between the pair of air inlet pipes 700, free ends of the pair of air inlet pipes 700 are respectively connected to the other end of the condenser 4002 in the first cooling mechanism 400 and the inlet of the compressor 600, a pair of air outlet pipes 900 are provided between the compressor 600 and the second cooling mechanism, a fifth solenoid valve 1000 is connected between the pair of air outlet pipes 900, free ends of the pair of air outlet pipes 900 are respectively connected to one end of the condenser 4002 in the second cooling mechanism and the outlet of the compressor 600, a conduit 1200 is connected between the other end of the condenser 4002 in the second cooling mechanism and the inlet of the gas-liquid separator 1100.

[0030] Specifically, the number of compressors 600 and cooling mechanisms can be adjusted according to actual capture requirements.

[0031] Specifically, each electrical component in the present technical solution is automatically controlled by a PLC controller, and each electrical component can also be manually controlled.

[0032] 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.

[0033] See also Figure 1 - Figure 4 The present invention provides a technical solution: a method for using a carbon dioxide capture device, comprising the following steps: Step 1: introduce the desulfurized gas to be treated into the drying box 1001, and start the four sets of heaters 1002 to heat the air in the drying chamber 1004. After the gas to be treated is dried by hot air and acidic desiccant, most of the moisture in it can be removed. While drying the gas to be treated, open one of the first solenoid valves 4004 and start one of the first pumps 5002, so that the coolant enters the cooling box 4001 of the first cooling mechanism 400. When the cooling box 4001 of the first cooling mechanism 400 is filled with coolant, close the first solenoid valve 4004 and the first pump 5002; Step 2: Open the sixth solenoid valve 300, and the dry gas enters the condenser 4002 in the first cooling mechanism 400 through a pair of discharge pipes 200, and exchanges heat with the coolant in the cooling box 4001 of the first cooling mechanism 400, thereby reducing the temperature of the gas to be treated; Step 3, open the fourth solenoid valve 800, and the cooled gas to be treated enters the compressor 600 through a pair of air inlet pipes 700, then close the fourth solenoid valve 800, start the compressor 600 and open one of the third solenoid valves, so that the coolant in the cooling box 4001 of the first cooling mechanism 400 flows out completely, and the compressor 600 squeezes the gas to be treated to increase its pressure. When the coolant flows out completely, close one of the third solenoid valves and start one of the second pumps 13004 and one of the second solenoid valves, and start another first pump 5002 and another first solenoid valve 4004 at the same time, so that the hot water fills the cooling box 4001 of the first cooling mechanism 400 to eliminate the ice in the condenser 4002 of the first cooling mechanism 400, so that the coolant fills the cooling box 4001 of the second cooling mechanism, and finally close one of the second pumps 13004 and one of the second solenoid valves, another first pump 5002 and another first solenoid valve 4004; Step 4, open the fifth solenoid valve 1000, the high-pressure gas to be treated enters the condenser 4002 of the second cooling mechanism through a pair of gas outlet pipes 900, and exchanges heat with the coolant in the cooling box 4001 of the second cooling mechanism, thereby reducing the temperature of the gas to be treated again, and finally flows into the gas-liquid separator 1100. At this time, liquefied carbon dioxide flows out from the bottom outlet of the gas-liquid separator 1100, and the remaining gas is discharged from the top of the gas-liquid separator 1100. At this time, open one of the third solenoid valves to make all the hot water in the cooling box 4001 of the first cooling mechanism 400 flow out, and then close one of the third solenoid valves; Step five, open another third solenoid valve to allow all the coolant in the cooling box 4001 of the second cooling mechanism to flow out, then close the third solenoid valve, start another second pump 13004 to open another second solenoid valve, so that hot water fills the cooling box 4001 of the second cooling mechanism, close another second pump 13004 and another second solenoid valve again, so that the hot water can eliminate the ice in the condenser 4002 of the second cooling mechanism, finally open the third solenoid valve again to allow all the hot water to be discharged, and close the third solenoid valve again.

Claims

1. A carbon dioxide capture device, characterized in that: The invention comprises a drying mechanism (100), a first cooling mechanism (400), a second cooling mechanism, a compressor (600), a first water supply mechanism (500), a gas-liquid separator (1100), a second water supply mechanism (1300), and a gas to be treated, wherein the first water supply mechanism (500) stores a cooling liquid, and the first water supply mechanism (500) pumps the cooling liquid into the first cooling mechanism (400) and the second cooling mechanism, the second water supply mechanism (1300) stores hot water, and the second water supply mechanism (1300) pumps the hot water into the first cooling mechanism (400) and the second cooling mechanism, the first cooling mechanism (400) and the second cooling mechanism discharge the liquid in the first cooling mechanism (400) and the second cooling mechanism, and the gas to be treated flows through the drying mechanism (100), the first cooling mechanism (400), the compressor (600), the second cooling mechanism, and the gas-liquid separator (1100) in sequence.

2. A carbon dioxide capture device according to claim 1, characterized in that: The drying mechanism (100) comprises a drying box (1001), wherein the drying box (1001) is provided with a drying chamber (1004) and a heating chamber (1003) in sequence from the inside to the outside, wherein the interior of the drying chamber (1004) is filled with an acidic desiccant, and four groups of heaters (1002) are installed on the outside of the drying box (1001), and one end of the four groups of heaters (1002) is in contact with the wall surface of the heating chamber (1003), and one side of the drying box (1001) is connected to a feed pipe via a one-way valve, and the gas to be treated enters the drying chamber (1004) via the feed pipe.

3. A carbon dioxide capture device according to claim 2, characterized in that: The first cooling mechanism (400) and the second cooling mechanism both comprise a cooling box (4001); a pair of discharge pipes (200) are connected between the cooling box (4001) in the first cooling mechanism (400) and the drying box (1001); and a sixth solenoid valve (300) is connected between the pair of discharge pipes (200).

4. A carbon dioxide capture device according to claim 3, characterized in that: The cooling box (4001) is provided with a condenser (4002) inside, and a plurality of heat dissipation fins (4003) are provided on the surface of the condenser (4002). One end of the condenser (4002) in the first cooling mechanism (400) is connected to one of the discharge pipes (200). The first cooling mechanism (400) and the second cooling mechanism also include a first solenoid valve (4004) and a cold water pipe (4005). The cooling box (4001) is connected to the cold water pipe (4005) via the first solenoid valve (4004). The first water supply mechanism (500) includes a cold water tank (5001). The coolant is stored in the cold water tank (5001). A pair of first pumps (5002) are provided on the outside of the cold water tank (5001). The pair of first pumps (5002) pump the coolant into the pair of cold water pipes (4005).

5. A carbon dioxide capture device according to claim 4, characterized in that: The first cooling mechanism (400) and the second cooling mechanism both include a second solenoid valve and a hot water pipe (4006), and the cooling tank (4001) is connected to the hot water pipe (4006) via the second solenoid valve. The second water supply mechanism (1300) includes a hot water tank (13001), the hot water is stored in the hot water tank (13001), an electric heating wire (13003) is installed inside the hot water tank (13001), and a pair of second pumps (13004) are installed outside the hot water tank (13001), and the pair of second pumps (13004) pump the hot water into the pair of hot water pipes (4006).

6. A carbon dioxide capture device according to claim 5, characterized in that: The first cooling mechanism (400) and the second cooling mechanism also each comprise a third solenoid valve and a drain pipe (4007), and the cooling box (4001) is connected to the drain pipe (4007) via the third solenoid valve.

7. A carbon dioxide capture device according to claim 5, characterized in that: A temperature sensor (13004) is installed inside the hot water tank (13001), and a controller (13002) is installed outside the hot water tank (13001). The controller (13002) is connected to the temperature sensor (13005) via an ADC converter.

8. A carbon dioxide capture device according to claim 4, characterized in that: A pair of air inlet pipes (700) are provided between the compressor (600) and the first cooling mechanism (400), a fourth solenoid valve (800) is connected between the pair of air inlet pipes (700), the free ends of the pair of air inlet pipes (700) are respectively connected to the other end of the condenser (4002) in the first cooling mechanism (400) and the inlet of the compressor (600), a pair of air outlet pipes (900) are provided between the compressor (600) and the second cooling mechanism, a fifth solenoid valve (1000) is connected between the pair of air outlet pipes (900), the free ends of the pair of air outlet pipes (900) are respectively connected to one end of the condenser (4002) in the second cooling mechanism and the outlet of the compressor (600), and a conduit (1200) is connected between the other end of the condenser (4002) in the second cooling mechanism and the inlet of the gas-liquid separator (1100).

9. A method for using a carbon dioxide capture device, applied to a carbon dioxide capture device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1, introducing the gas to be treated after desulfurization treatment into the drying box (1001), and starting the four sets of heaters (1002) to heat the air in the drying chamber (1004). After the gas to be treated is dried by hot air and acidic desiccant, most of the moisture in the gas can be removed. While drying the gas to be treated, one of the first solenoid valves (4004) is opened and one of the first pumps (5002) is started, so that the coolant enters the cooling box (4001) of the first cooling mechanism (400). When the cooling box (4001) of the first cooling mechanism (400) is filled with coolant, the first solenoid valve (4004) and the first pump (5002) are closed; Step 2, opening the sixth solenoid valve (300), the dry gas enters the condenser (4002) in the first cooling mechanism (400) through a pair of discharge pipes (200), and exchanges heat with the coolant in the cooling box (4001) of the first cooling mechanism (400), thereby reducing the temperature of the gas to be treated; Step 3, opening the fourth solenoid valve (800), allowing the cooled gas to be treated to enter the compressor (600) through a pair of air inlet pipes (700), then closing the fourth solenoid valve (800), starting the compressor (600) and opening one of the third solenoid valves, so that all the coolant in the cooling box (4001) of the first cooling mechanism (400) flows out, and the compressor (600) squeezes the gas to be treated to increase its pressure. When all the coolant flows out, closing one of the third solenoid valves and starting one of the second pumps (13004 ) and one of the second solenoid valves, and simultaneously start another first pump (5002) and another first solenoid valve (4004), so that hot water fills the cooling box (4001) of the first cooling mechanism (400) to eliminate ice in the condenser (4002) of the first cooling mechanism (400), so that coolant fills the cooling box (4001) of the second cooling mechanism, and finally closes one of the second pumps (13004) and one of the second solenoid valves, another first pump (5002) and another first solenoid valve (4004); Step 4, open the fifth solenoid valve (1000), the high-pressure gas to be treated enters the condenser (4002) of the second cooling mechanism through a pair of gas outlet pipes (900), and exchanges heat with the coolant in the cooling box (4001) of the second cooling mechanism, thereby reducing the temperature of the gas to be treated again, and finally flows into the gas-liquid separator (1100), at which time the liquefied carbon dioxide flows out from the bottom outlet of the gas-liquid separator (1100), and the remaining gas is discharged from the top of the gas-liquid separator (1100), at which time one of the third solenoid valves is opened to allow all the hot water in the cooling box (4001) of the first cooling mechanism (400) to flow out, and then one of the third solenoid valves is closed; Step five, open another third solenoid valve to allow all the coolant in the cooling box (4001) of the second cooling mechanism to flow out, then close the third solenoid valve, start another second pump (13004) and open another second solenoid valve to allow hot water to fill the cooling box (4001) of the second cooling mechanism, close another second pump (13004) and another second solenoid valve again, allow the hot water to eliminate the ice in the condenser (4002) of the second cooling mechanism, finally open the third solenoid valve again to allow all the hot water to be discharged, and close the third solenoid valve again.

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