Apparatus for recovering carbon dioxide and method for recovering carbon dioxide

Abstract

To provide a method for recovering carbon dioxide which recovers high-purity carbon dioxide at a low energy cost.SOLUTION: An apparatus for recovering carbon dioxide according to one aspect of the present invention includes: a first storage unit that is constituted by a partition wall that separates an internal space from the atmosphere, stores first liquid in which gas containing carbon dioxide is dissolved in the internal space, and retains first gas in a first space not filled with the first liquid; an impure gas removal unit that removes an impure gas from the first gas retained in the first space; a second storage unit that is constituted by a partition wall that separates an internal space from the atmosphere, stores second liquid obtained from the first liquid treated by the impure gas removal unit, and retains the second gas in a second space not filled with the second liquid; and an accumulation unit that recovers carbon dioxide from the second gas and accumulates the carbon dioxide.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to a carbon dioxide recovery device and a carbon dioxide recovery method that increase the purity of carbon dioxide by degassing a liquid by reducing the pressure, and then heating and reducing the pressure of the liquid to recover the carbon dioxide. [Background technology]

[0002] As a measure against global warming, there is a worldwide demand to reduce the burden on the global environment by reducing the amount of carbon dioxide in the atmosphere. To achieve this, two things are necessary: ​​reducing carbon dioxide emissions and, at the same time, reducing the concentration of carbon dioxide in the atmosphere by capturing carbon dioxide that is already present in the atmosphere. The concentration of carbon dioxide in the atmosphere is low, at around 400 ppm, so in order to reduce the concentration of carbon dioxide in the atmosphere, a method that minimizes the release of new carbon dioxide as energy for capture is required.

[0003] One method of capturing carbon dioxide without releasing new carbon dioxide is to capture it through seawater or freshwater, which contains dissolved carbon dioxide from the atmosphere, and a known method is to extract carbon dioxide from the aforementioned seawater or freshwater by reducing the pressure.

[0004] Patent Document 1 describes a carbon dioxide recovery system that depressurizes a regeneration tank installed in a seawater circulation line with one end immersed in seawater, and separates carbon dioxide dissolved in the seawater. Specifically, the system separates carbon dioxide bubbles in a decompressed space to remove carbon dioxide from seawater, and recovers the carbon dioxide.

[0005] However, the device described in Patent Document 1 uses the Pitot tube effect to reduce the pressure inside the regeneration tank, and requires a high-pressure pump to circulate the liquid through a liquid circulation path that includes a pressurized tank to which a high pressure of 5 MPa is applied, which requires a large amount of electricity. For this reason, a carbon dioxide recovery method that can recover high-purity carbon dioxide at low energy costs is desired. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2023-048054 Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide a method for recovering carbon dioxide, which recovers high-purity carbon dioxide at low energy cost. [Means for solving the problem]

[0008] In order to solve the above problems, a carbon dioxide recovery device in one aspect of the present invention includes a first storage section that is composed of a partition wall that separates the atmosphere from an internal space, and that stores a first liquid in which a gas containing carbon dioxide is dissolved in the internal space, and that allows a first gas to remain in a first space that is not filled with the first liquid; an impure gas removal unit that removes impure gas from the first gas remaining in the first space; a second storage section that is composed of a partition wall that separates the atmosphere from an internal space, stores a second liquid obtained from the first liquid treated by the impure gas removal section, and allows a second gas to remain in a second space that is not filled with the second liquid; and an accumulation section that recovers and accumulates carbon dioxide from the second gas.

[0009] Another aspect of the present invention is a storage section that is composed of a partition wall that separates the atmosphere from an internal space, and stores a first liquid in the internal space, in which a gas including carbon dioxide is dissolved, and stores a first gas in a space that is not filled with the first liquid; an impure gas removal unit that removes impure gas from the first gas remaining in the space; an accumulation section in which, after the first gas has been treated by the impure gas removal section, a second liquid obtained from the first liquid is stored in the storage section, and carbon dioxide is recovered from the second gas remaining in a space in the internal space that is not filled with the second liquid, and the carbon dioxide is accumulated; The carbon dioxide recovery device is characterized by having: [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a carbon dioxide recovery device that improves the purity of carbon dioxide recovered from a liquid at low energy cost. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic diagram of a carbon dioxide recovery device according to a first embodiment of the present invention. [Figure 2] Graph showing the amount of dissolved metal in seawater at atmospheric pressure equilibrium. [Figure 3] FIG. 5 is a schematic diagram of a carbon dioxide recovery device according to a second embodiment of the present invention. [Figure 4] FIG. 10 is a schematic diagram of a carbon dioxide recovery device according to a third embodiment of the present invention. [Figure 5] FIG. 10 is a schematic diagram of a carbon dioxide recovery device according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] In one aspect of the present invention, the carbon dioxide recovery device is provided with a first storage section that is composed of a partition wall that separates the atmosphere from an internal space, stores a first liquid in the internal space in which a gas containing carbon dioxide is dissolved, and retains the first gas in the first space that is not filled with the first liquid.

[0013] In addition, the apparatus includes an impure gas removal unit that removes impure gas from the first gas remaining in the first space, and a second storage unit that is composed of a partition wall that separates the atmosphere from the internal space, stores a second liquid obtained from the first liquid treated by the impure gas removal unit, and allows the second gas to remain in the second space that is not filled with the second liquid.

[0014] In addition, it has an accumulation section that recovers and accumulates carbon dioxide from the second gas.

[0015] Another aspect of the present invention is a storage section that is composed of a partition wall that separates the atmosphere from an internal space, stores a first liquid in the internal space in which a gas containing carbon dioxide is dissolved, and allows the first gas to remain in the space that is not filled with the first liquid, and further includes an impure gas removal section that removes impure gas from the first gas remaining in the space.

[0016] Furthermore, after the first gas is treated by the impure gas removal section, a second liquid obtained from the first liquid is stored in the storage section, and a storage section is provided that recovers and stores carbon dioxide from the second gas that remains in the space in the internal space that is not filled with the second liquid.

[0017] This will be explained in detail below with reference to the drawings.

[0018] A carbon dioxide capture device according to one embodiment of the present invention captures carbon dioxide from the atmosphere by reducing the pressure of a liquid containing dissolved carbon dioxide, such as rainwater, river water, lake water, or seawater, using a vacuum pump to capture the carbon dioxide dissolved in the liquid. In freshwater such as rainwater or river water, atmospheric carbon dioxide is dissolved at equilibrium pressure. Seawater, by comparison, has an even higher solubility of carbon dioxide. Furthermore, the solubility of carbon dioxide in water is high at low temperatures and low at high temperatures. Furthermore, the higher the atmospheric pressure, the higher the solubility of carbon dioxide, and the lower the atmospheric pressure, the lower the solubility.

[0019] In order to reduce the amount of carbon dioxide in the atmosphere as a measure against global warming, it is necessary to extract carbon dioxide while feeding and discharging large amounts of seawater or freshwater into the device. In order to capture carbon dioxide from seawater or freshwater using low energy, it is desirable to extract carbon dioxide by depressurizing the seawater or freshwater.

[0020] The carbon dioxide capture device according to the present invention can capture carbon dioxide at low cost with a simple device configuration. Specifically, seawater or freshwater is pumped, the carbon dioxide released from the storage section is captured, and the seawater or freshwater is circulated within the device using the siphon principle. Here, for example, the storage section is a Torricelli vacuum (a vacuum space created at the top as water is pumped), and a Torricelli vacuum refers to a vacuum space created in a space above the height limit at which water can be pumped by reducing pressure. It is generally known that a Torricelli vacuum is formed due to the relationship between atmospheric pressure, the specific gravity of the solution, and the vapor pressure of the solution; for water at sea level, a Torricelli vacuum occurs when the depth exceeds approximately 10 meters.

[0021] In one embodiment of the carbon dioxide capture device of the present invention, carbon dioxide dissolved in seawater or freshwater is released as a gas when a Torricelli vacuum is applied, so that the carbon dioxide can be discharged using a vacuum pump and captured in a capture tank. The carbon dioxide capture device of the present invention also utilizes, for example, the siphon principle to circulate the pumped seawater or freshwater within the device under reduced pressure. The method of circulation within the device is not limited to the siphon principle, and any other known technology may be used as long as it is a mechanism for circulating a liquid.

[0022] In the carbon dioxide capture device of the present invention, the pressure density due to the weight of the liquid in the water supply channel and the pressure density of the liquid in the drainage channel are the same if the water supply channel and the drainage channel are at the same height. In other words, if the water level of the water supply surface is higher than the water level of the drainage surface, the liquid can be caused to flow from the water supply side to the drainage side by potential energy without power assistance such as a water flow pump. Furthermore, even if the water supply surface and the drainage surface are at the same height, the liquid can be circulated within the device by providing slight power assistance using a water flow pump. By adopting the above-mentioned configuration and method, the carbon dioxide capture device of the present invention is able to capture carbon dioxide with low energy.

[0023] Furthermore, the present invention can increase the purity of recovered carbon dioxide at low energy costs. Carbon dioxide dissolves in liquids such as seawater at atmospheric pressure equilibrium. Nitrogen, oxygen, and carbon dioxide are primarily present in the atmosphere. Carbon dioxide is ionizable, so it dissolves in basic liquids such as seawater in higher amounts than nitrogen and oxygen. It is also generally known that carbon dioxide dissolves in liquid as carbonic acid, bicarbonate ions, and carbonate ions, depending on the pH of the liquid. While readily soluble in liquids, ionized carbon dioxide takes time to release from the liquid due to reduced pressure. Therefore, the gas released from seawater due to reduced pressure initially contains a high proportion of impurity gases such as nitrogen and oxygen, and the proportion of carbon dioxide increases over time. The purity of carbon dioxide can be increased by reducing the pressure of the liquid and gradually reducing the release of impurity gases. Then, the carbon dioxide released is recovered.

[0024] Figure 2 shows the dissolved amounts of each gas in seawater at atmospheric equilibrium. Seawater at atmospheric equilibrium has a pH of approximately 8, with the amounts of each gas per liter being approximately 88 mg of carbon dioxide, 8 mg of oxygen, and 3.3 mg of nitrogen. Furthermore, some carbon dioxide exists as bicarbonate ions. At this pH, the ratio of carbon dioxide in seawater is carbonic acid:bicarbonate ions:carbonate ions = 1:100:10, with ionized carbon dioxide accounting for most of the carbon dioxide in seawater. Using the dissolved amounts of carbon dioxide, oxygen, and nitrogen in seawater mentioned above as a reference, experimental measurements of the gas release rates released by depressurizing seawater revealed that the release rate of oxygen was higher than that of carbon dioxide in a 20-minute depressurization experiment. The carbon dioxide release rate was approximately 2% of the total carbon content over 20 minutes, while that of oxygen was on the order of 10%. Therefore, the release rate decreases as the absolute amount of oxygen decreases over the course of depressurization. In other words, the purity of carbon dioxide recovered later in time is higher than the purity of carbon dioxide recovered at the beginning of depressurization, so high-purity carbon dioxide can be recovered by selectively recovering the released gas from seawater at certain times.

[0025] Furthermore, it is generally known that when seawater or freshwater is heated, dissolved gases are gradually released as the temperature of the liquid rises, with the amount of carbon dioxide released beginning to increase at around 60°C under normal pressure, and most of the dissolved carbon dioxide is released at around 80°C. Oxygen and nitrogen are also gradually released from the liquid as the water temperature rises, but unlike carbon dioxide, most of the dissolved gas is released at around 100°C. For this reason, in order to recover high-purity carbon dioxide, it is desirable to heat seawater or freshwater to a temperature between 60°C and less than 100°C under normal pressure. Similarly, when recovering carbon dioxide by decompressing the liquid, it is desirable to recover the released gas at a liquid temperature and degree of vacuum that do not cause the liquid to boil under reduced pressure.

[0026] The liquid from which carbon dioxide is captured can be seawater, rainwater, river water, lake water, or tap water. Alternatively, as described in the examples below, a liquid can be circulated within a system to capture atmospheric CO2 and then capture the CO2 from the captured liquid. In this case, a basic aqueous solution such as an amine can be used to capture CO2 because it has a chemical bond. The use of a fluorine-based active liquid with high CO2 solubility increases the capture efficiency. Furthermore, the fluorine-based active liquid with high CO2 solubility is characterized by being selected from fluorocarbons that may have a substituent and a branched and / or cyclic structure in terms of viscosity. Examples include perflubron, perfluorodecalin, Fluorinert FC-3283, perfluorobutyl perfluorotetrahydrofuran, and perfluoro-1-isopropoxyhexane. Other examples include perfluoro-1,4-diisopropoxybutane and hydrofluoroethers (Novec 7100, Novec 7300). These examples do not limit the scope of the present invention. It is also useful to mix other liquids to adjust the physical properties of the liquid.

[0027] The present invention will be described in detail below with reference to preferred embodiments. However, the present invention is not limited to the following embodiments, and appropriate modifications and improvements to the following embodiments based on the ordinary knowledge of those skilled in the art are also included within the scope of the present invention, provided that they do not deviate from the spirit of the present invention.

[0028] [First embodiment] An example of the functional configuration of the carbon dioxide recovery device of the present invention will be described below with reference to FIG.

[0029] With discharge valve 105 closed, the inside of first reservoir 101 is depressurized by vacuum pump 102, and injection valve 104 is opened to supply liquid 100 into first reservoir 101. In this example, liquid 100 is seawater. The injection valve is controlled so that a constant amount of liquid 100 is supplied by a water level sensor (not shown) provided in first reservoir 101, and the amount of liquid is set to a level that allows first space 103 to exist inside first reservoir 101.

[0030] First space 103 is depressurized to about 3 kPa by vacuum pump 102. In first space 103, carbon dioxide released by liquid 100 due to the depressurization and gas containing nitrogen and oxygen as impurity gases are present, and these gases are discharged to the outside of first reservoir 101 by vacuum pump 102. Depending on the environment, at least one of nitrogen and oxygen may be an impurity gas.

[0031] The vacuum pump 102 may operate intermittently or continuously.

[0032] After degassing liquid 100 by reducing the pressure for a certain period of time, valve 116 is closed to stop the operation of vacuum pump 102, and discharge valve 105 is opened to supply liquid 100 to second reservoir 108. The interior of second reservoir 108 is depressurized in advance, and liquid 100 is supplied from first reservoir 101 to second reservoir 108 by its own weight, but a separate water flow pump may also be provided to supply liquid 100. Furthermore, since air cannot immediately dissolve into degassed liquid 100 even when it is returned to an atmospheric pressure environment, a method in which liquid 100 is first discharged to an atmospheric pressure environment and then injected into second reservoir 108 may also be used.

[0033] Liquid 107 inside second reservoir 108 is liquid 100 degassed in first reservoir 101. The sizes of first reservoir 101 and second reservoir 108 were determined so that the amount of liquid 107 would be such that second space 110 exists inside second reservoir 108. Valve 105 was closed, and gas containing carbon dioxide released from liquid 107 inside second reservoir 108 by vacuum pump 109 was collected via vapor filter 111 and stored in CO2 storage portion 112.

[0034] In this embodiment, the degree of vacuum in the second space 110 was approximately 3 kPa, but this pressure is not limited and may be reduced below atmospheric pressure. The gas release promoter 115 acts as an oscillator to vibrate the liquid 107, thereby accelerating gas release. The oscillator is driven by a drive circuit (not shown). Since the vibration of the liquid 107 promotes gas release, the frequency is not limited. A low frequency with sufficient vibration amplitude may be used, for example, vibration in the range of 1 Hz to 1 MHz. Furthermore, the gas release promoter 115 is not limited to an oscillator. As long as it can promote gas release from the liquid 107, it may be a heater or a porous material that generates bubbles in the liquid by reducing pressure, such as boiling stones. The gas release promoter 115 may also be provided in the first storage section 101. The second storage section may be configured to leak carbon dioxide under vacuum.

[0035] After reducing the pressure of liquid 107 for a certain period of time and recovering the released gas, valve 117 is closed and then valve 113 is opened to allow carbon dioxide to leak in, thereby bringing second space 110 to atmospheric pressure. Discharge valve 114 is opened, and liquid 107 is discharged by its own weight to the outside of second reservoir 108. High-purity carbon dioxide is recovered from the liquid by repeating the above-described method.

[0036] [Second embodiment] An example of the functional configuration of the carbon dioxide recovery device of the present invention will be described below with reference to FIG.

[0037] The liquid 100 is seawater, and is supplied to the reservoir 120 via a supply pump 121 through a liquid space 122. The reservoir 120 has a partition wall inside, and the pumped liquid 100 creates a first space 103 and a second space 110. The first space 103 is depressurized by a vacuum pump 102. Similarly, the second space 110 is depressurized by a vacuum pump 109.

[0038] First space 103 and second space 110 are each evacuated to a vacuum of about 3 kPa using a vacuum pump, and the lift of liquid 100 is set to about 10 m, which is the Torricelli vacuum height. When supply pump 121 slightly pumps liquid 100, liquid 100 inside first reservoir 101 moves sequentially to second reservoir 108 in accordance with the pumping amount of liquid 100 so as to maintain the Torricelli vacuum height. Liquid 100 is drained by its own weight from a drain outlet at the bottom end of discharge pipe 123.

[0039] That is, the liquid 100 is circulated with little energy using the siphon principle. The time required to degas impurity gases from the liquid 100 and the time required to recover carbon dioxide are determined by the relationship between the amount of liquid 100 supplied by the supply pump 121, the amount stored in the first reservoir 101, and the amount stored in the second reservoir 108.

[0040] In this embodiment, gas release promoting section 115 accelerates gas release by vibrating liquid 107 as an oscillator, but is not limited to an oscillator as long as it can promote gas release. Gas release promoting section 115 may also be provided in first storage section 101. Furthermore, although the lift of liquid 100 due to reduced pressure between first space 103 and second space 110 is set to 10 m, this is not limited thereto, and the lift of liquid 100 may be adjusted by lowering the degree of vacuum in the aforementioned spaces. Furthermore, the degree of vacuum in first space 103 and second space 110 does not need to be the same and may be different.

[0041] In this embodiment, the liquid 100 is seawater, but this is not limited to seawater, and it may be river water, for example.If the supply surface water level of the liquid 100 is higher than the discharge surface water level, the liquid 100 may be circulated without a supply pump.

[0042] [Third embodiment] An example of the functional configuration of the carbon dioxide recovery device of the present invention will be described below with reference to Fig. 4. In this embodiment, the device is configured with one storage section 120, and is configured to time-selectively recover gas released into space 130.

[0043] The liquid 100 containing dissolved carbon dioxide is seawater, but is not limited to seawater. The reservoir 120 is depressurized by the vacuum pump 102 with the valve 131 open and the valve 132 closed. The injection valve 104 is opened to inject the liquid 100 into the reservoir 120, thereby forming a space 130 above the reservoir 120. The method of injecting the liquid 100 to a desired liquid level is automatic control, in which a water level sensor (not shown) detects the liquid level of the liquid 100 inside the reservoir 120 and adjusts the injection valve 104, but other means may also be used. In this embodiment, a control device (not shown) is provided, configured to release gas released from the liquid 100 during the first 20 minutes after the depressurization of the space 130 to the outside of the reservoir 120 via the valve 131.

[0044] Next, valve 131 was closed and valve 132 was opened, and for 60 minutes, gas containing carbon dioxide released from liquid 100 was accumulated in CO2 accumulation section 112. After the desired time of gas collection was completed, valve 117 was closed and leak valve 106 was opened, and space 130 was set to atmospheric pressure.

[0045] The drain valve 114 is opened to allow the liquid 100 to drain from the reservoir 120 under its own weight.

[0046] Furthermore, by repeating the above procedure, highly pure carbon dioxide can be recovered.

[0047] [Fourth embodiment] An example of the functional configuration of the carbon dioxide recovery device of the present invention will be described below with reference to FIG.

[0048] With discharge valve 105 closed, the inside of first reservoir 101 is depressurized by vacuum pump 102, and injection valve 104 is opened to supply liquid 100 into first reservoir 101. In this example, liquid 100 is seawater. The injection valve is controlled so that a constant amount of liquid 100 is supplied by a water level sensor (not shown) provided in first reservoir 101, and the amount of liquid is set to a level that allows first space 103 to exist inside first reservoir 101.

[0049] First space 103 is depressurized to about 3 kPa by vacuum pump 102. In first space 103, carbon dioxide released by liquid 100 due to the depressurization and gas containing nitrogen and oxygen as impurity gases are present, and this gas is discharged to the outside of first reservoir 101 by vacuum pump 102. Vacuum pump 102 may operate intermittently or continuously.

[0050] After degassing liquid 100 by reducing the pressure for a certain period of time, valve 116 is closed to stop the operation of vacuum pump 102, and discharge valve 105 and leak valve 106 are opened to supply liquid 100 to second reservoir 108. Because the interior of second reservoir 108 is at atmospheric pressure, liquid 100 is supplied from first reservoir 101 to second reservoir 108 by its own weight, but a separate water flow pump may also be provided to supply liquid 107 inside second reservoir 108. Liquid 107 inside second reservoir 108 is liquid 100 degassed in first reservoir 101. The sizes of first reservoir 101 and second reservoir 108 are determined so that the amount of liquid 107 is such that second space 110 exists inside second reservoir 108.

[0051] Valve 105 is closed, and liquid 107 is heated by heater 140. Heater 140 is preferably an electric heater using green electricity, or energy derived from factory exhaust heat, geothermal heat, or sunlight. In this embodiment, liquid 107 is heated to 80°C at normal pressure, but the temperature is not limited thereto, and a range of 60°C to less than 100°C is preferable in order to recover highly pure carbon dioxide.

[0052] The carbon dioxide-containing gas released into the second space 110 is sucked by the compressor 124 through the steam filter 153 and the buffer tank 141. After being heated for a predetermined time, the liquid 107 is discharged from the second storage section 108 by its own weight by opening the discharge valve 114. A predetermined amount of liquid 143 is stored in the third storage section 144. The liquid 143 may be any liquid in which carbon dioxide dissolves, such as pure water, seawater, fresh water, or a basic liquid. In this embodiment, ordinary tap water was used. It is generally known that carbon dioxide dissolves more readily in water than oxygen or nitrogen, and water can be considered a readily available, inexpensive CO2 filter. The compressor 124 supplies the carbon dioxide-containing gas to the third storage section 144 to pressurize the third space 144. The amount of carbon dioxide supplied to the third space 144 is preferably an amount sufficient to saturate the liquid 143, but the pressure in the third space 144 will vary depending on the amount of impurity gases contained in the supplied gas. Therefore, the pressure in the third space 144 ranges from several to several tens of atmospheres.

[0053] After the gas containing carbon dioxide has dissolved in the liquid 143, valve 157 is opened to discharge the gas in the third space 144. This gas contains a large amount of oxygen and nitrogen that could not be dissolved due to supersaturation, so it is discharged to the atmosphere, but since it also contains carbon dioxide, it may be recovered in the buffer tank 141. The fourth storage section 147 is depressurized in advance, and valve 156 is opened to pump the liquid 143 into the fourth storage section 145 due to the pressure difference between the third space 144 and the fourth space 147. Once the pumping is complete, valve 156 is closed. The pumped liquid 146 is depressurized and releases impure gases including carbon dioxide into the fourth space 147. The impure gases are recovered in the buffer tank 141 by a vacuum pump 149.

[0054] After collecting the impure gas for a desired time, valve 148 is closed and valve 154 is opened, and the liquid 146 is supplied to fifth storage section 150, which has been depressurized in advance, by its own weight. Carbon dioxide is released from liquid 151 into fifth space 152, and is collected by vacuum pump 109 through filter 153 and stored in CO2 storage section 112. Carbon dioxide may be stored in the CO2 storage section by pressurizing it with a compressor.

[0055] After recovering the carbon dioxide from the liquid 151, valve 117 is closed, the operation of vacuum pump 109 is stopped, and valve 113 is opened to return fifth space 152 to atmospheric pressure using carbon dioxide. Third reservoir 142 is at atmospheric pressure because valve 157 is open, and valve 155 is opened to supply liquid 151 to third reservoir 142 using the weight of liquid 151. After the supply of liquid 151 is completed, valves 113 and 157 are closed.

[0056] The method may not require the step in fourth storage section 145, as the effect of increasing the carbon dioxide concentration can be achieved without this step. By repeating the steps described above, it becomes possible to recover highly pure carbon dioxide.

[0057] The following are some aspects of the present invention.

[0058] [Mode 1] a first storage section that is composed of a partition wall that separates the atmosphere from an internal space, and that stores a first liquid in which a gas including carbon dioxide is dissolved in the internal space, and causes a first gas to remain in a first space that is not filled with the first liquid; an impure gas removal unit that removes impure gas from the first gas remaining in the first space; a second storage section that is composed of a partition wall that separates the atmosphere from an internal space, stores a second liquid obtained from the first liquid treated by the impure gas removal section, and allows a second gas to remain in a second space that is not filled with the second liquid; and an accumulation section that recovers and accumulates carbon dioxide from the second gas.

[0059] [Mode 2] a storage section that is composed of a partition wall that separates the atmosphere from an internal space, and stores a first liquid in the internal space in which a gas containing carbon dioxide is dissolved, and allows the first gas to remain in a space that is not filled with the first liquid; an impure gas removal unit that removes impure gas from the first gas remaining in the space; an accumulation section in which, after the first gas has been treated by the impure gas removal section, a second liquid obtained from the first liquid is stored in the storage section, and carbon dioxide is recovered from the second gas remaining in a space in the internal space that is not filled with the second liquid, and the carbon dioxide is accumulated; A carbon dioxide recovery device comprising:

[0060] [Mode 3] 3. The carbon dioxide recovery apparatus according to claim 1, wherein the impure gas contains at least one of nitrogen and oxygen.

[0061] [Mode 4] 4. The carbon dioxide recovery device according to any one of aspects 1 to 3, wherein any or all of the storage sections for storing the liquid are decompressed relative to atmospheric pressure.

[0062] [Mode 5] 5. The carbon dioxide recovery device according to any one of aspects 1 to 4, wherein the liquid stored in the storage section is drained by its own weight.

[0063] [Mode 6] 6. The carbon dioxide recovery device according to any one of aspects 1 to 5, wherein the liquid in which the carbon dioxide is dissolved circulates by the siphon principle.

[0064] [Mode 7] 7. The carbon dioxide recovery device according to any one of aspects 1 to 6, wherein the storage unit that stores the liquid in which carbon dioxide is dissolved in the internal space has a Torricelli vacuum space.

[0065] [Mode 8] 8. The carbon dioxide recovery device according to any one of aspects 1 to 7, wherein the gas release is promoted by at least one of heating, decompression, vibration, and a porous body.

[0066] [Mode 9] The carbon dioxide recovery device according to Aspect 1, wherein the second storage section is vacuum leaked with carbon dioxide. [Explanation of symbols]

[0067] 100 liquid 101 First Reservoir 102 Vacuum pump 103 First space 104 Injection valve 105 Exhaust valve 106 Leak Valve 107 Liquid 108 Second Reservoir 109 Vacuum Pump 110 Second space 111 Steam filter 112 CO2 storage section 113 Valve 114 Exhaust valve 115 Gas release promotion section 116 Valve 117 Valve

Claims

1. a first storage section that is composed of a partition wall that separates the atmosphere from an internal space, and that stores a first liquid in which a gas including carbon dioxide is dissolved in the internal space, and causes a first gas to remain in a first space that is not filled with the first liquid; an impure gas removal unit that removes impure gas from the first gas remaining in the first space; a second storage section that is composed of a partition wall that separates the atmosphere from an internal space, stores a second liquid obtained from the first liquid treated by the impure gas removal section, and allows a second gas to remain in a second space that is not filled with the second liquid; and an accumulation section that recovers and accumulates carbon dioxide from the second gas.

2. a storage section that is composed of a partition wall that separates the atmosphere from an internal space, and stores a first liquid in the internal space in which a gas containing carbon dioxide is dissolved, and allows the first gas to remain in a space that is not filled with the first liquid; an impure gas removal unit that removes impure gas from the first gas remaining in the space; an accumulation section in which, after the first gas has been treated by the impure gas removal section, a second liquid obtained from the first liquid is stored in the storage section, and carbon dioxide is recovered from the second gas remaining in a space in the internal space that is not filled with the second liquid, and the carbon dioxide is accumulated; A carbon dioxide recovery device comprising:

3. 3. The carbon dioxide recovery system according to claim 1, wherein the impure gas contains at least one of nitrogen and oxygen.

4. 3. The carbon dioxide recovery device according to claim 1, wherein any or all of the storage sections for storing the liquid are decompressed relative to atmospheric pressure.

5. 3. The carbon dioxide recovery device according to claim 1, wherein the liquid stored in the storage section is drained by its own weight.

6. 3. The carbon dioxide recovery device according to claim 1, wherein the liquid in which the carbon dioxide is dissolved circulates by the siphon principle.

7. 3. The carbon dioxide recovery device according to claim 1, wherein the storage section for storing the liquid in which carbon dioxide is dissolved in the internal space has a Torricelli vacuum space.

8. 3. The carbon dioxide recovery device according to claim 1, wherein the gas release is accelerated by at least one of heating, reducing pressure, vibrating, and using a porous material.

9. The carbon dioxide recovery device according to claim 1 , wherein the second storage section is configured to vacuum leak carbon dioxide.

Images