Carbon Dioxide Isolation Device and Carbon Dioxide Isolation Method

Abstract

Provided is a carbon dioxide gas sequestering device that sequesters carbon dioxide gas in a water region. This carbon dioxide gas sequestering device includes: a gas introduction unit that introduces a gas containing carbon dioxide gas; a water intake unit that takes in water from a water region; an air bubble generation unit that generates air bubbles of the gas introduced by the gas introduction unit in the water taken in by the water intake unit; and a settling pipe for sending the water containing the air bubble into the water region. With respect to the air bubbles, the air bubble generation unit generates air bubbles of a size such that Brownian motion occurs.

Description

Technical Field

[0001] The present disclosure relates to a carbon dioxide separation device and a carbon dioxide separation method.

Background Art

[0002] As one of various efforts to suppress the emission of carbon dioxide into the atmosphere, the isolation of carbon dioxide in water areas has been studied. Patent Document 1 discloses a technique for dissolving micro-bubbled carbon dioxide in seawater.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Even if carbon dioxide is micro-bubbled, the bubbles may rise from the water. In that case, it is necessary to pump the water containing the bubbles under a large pressure, consuming a lot of energy. Also, a method of retaining carbon dioxide in water in the form of liquid carbon dioxide or solid carbon dioxide (dry ice) instead of micro-bubbles is conceivable, but a large amount of energy is consumed for the production of liquid carbon dioxide or solid carbon dioxide. Therefore, a technology that can realize the isolation of carbon dioxide in water areas by a simpler method is required.

Means for Solving the Problems

[0005] The present disclosure can be realized in the following forms.

[0006] (1) According to a first aspect of the present disclosure, there is provided a carbon dioxide isolation device for isolating carbon dioxide in a water area. This carbon dioxide isolation device includes a gas introduction part for introducing a gas containing carbon dioxide, a water intake part for taking in water from the water area, a bubble generation part for generating bubbles of the gas introduced by the gas introduction part in the water taken in by the water intake part, and a settling pipe for sending the water containing the bubbles into the water area. The bubble generation part generates bubbles having a size that causes Brownian motion as the bubbles. According to the carbon dioxide isolation device of such a form, since the size of the bubbles containing carbon dioxide is a size that causes Brownian motion, the possibility that the bubbles do not rise and remain in the water area increases. Therefore, carbon dioxide can be isolated in the water area by a simple method. (2) In the carbon dioxide isolation device of the above form, the size of the bubbles is preferably less than 1 μm in diameter. In such a form, since the ratio of the surface area to the volume of the bubbles increases, the carbon dioxide in the bubbles is more likely to dissolve in water. (3) The carbon dioxide isolation device of the above form may further include a cooling part for cooling the water. In such a form, the amount of carbon dioxide dissolved in water can be increased, so that the water in which carbon dioxide is dissolved can be easily sedimented by gravity. (4) In the above form, the cooling part may be provided in the water intake part. In such a form, it is easy to increase the amount of carbon dioxide dissolved in water. (5) In the carbon dioxide isolation device of the above form, the cooling part may lower the temperature of the water to the water temperature of the water area near the outlet of the settling pipe. In such a form, it is easy to increase the amount of carbon dioxide dissolved in water. (6) The carbon dioxide gas isolation device of the above form may further include a flow rate measurement unit that measures the flow rate of the gas introduced by the gas introduction unit, a first concentration measurement unit that measures the concentration of the carbon dioxide gas in the gas, and a calculation unit that calculates the amount of the carbon dioxide gas introduced into the bubble generation unit based on the flow rate measured by the flow rate measurement unit and the concentration measured by the first concentration measurement unit, and an output unit that outputs information representing the calculated introduction amount of the carbon dioxide gas. In such a form, the amount of the carbon dioxide gas introduced into the carbon dioxide gas isolation device can be confirmed. (7) The carbon dioxide gas isolation device of the above form may further include a flow rate measurement unit that measures the flow rate of the gas introduced by the gas introduction unit, a first concentration measurement unit that measures the concentration of the carbon dioxide gas in the gas, a second concentration measurement unit that measures the concentration of the carbon dioxide gas near the water surface of the water area, and a calculation unit that calculates the amount of the carbon dioxide gas introduced into the bubble generation unit based on the flow rate measured by the flow rate measurement unit and the concentration measured by the first concentration measurement unit, and calculates the isolation amount of the carbon dioxide gas isolated in the water area based on the calculated introduction amount of the carbon dioxide gas and the increase amount of the concentration of the carbon dioxide gas measured by the second concentration measurement unit, and an output unit that outputs information representing the calculated isolation amount. In such a form, the amount of the carbon dioxide gas isolated in the water area can be confirmed. (8) In the carbon dioxide gas isolation device of the above form, the output unit may output the information representing the isolation amount to an emission trading server as information representing a credit used for the emission trading of the carbon dioxide gas. In such a form, the amount of the carbon dioxide gas isolated in the water area by the carbon dioxide gas isolation device can be used for the emission trading of the carbon dioxide gas. The present disclosure can be realized not only in the form of the carbon dioxide gas isolation device described above but also in the form of a carbon dioxide gas isolation method, a carbon dioxide gas isolation system, and the like.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0008] A. First Embodiment: FIG. 1 is an explanatory drawing showing the schematic configuration of a carbon dioxide gas isolation apparatus 100 as the first embodiment of the present disclosure. The carbon dioxide gas isolation apparatus 100 is an apparatus for isolating carbon dioxide gas in a water area 90. The water area 90 includes, for example, the ocean, lakes, rivers, etc. The carbon dioxide gas isolation apparatus 100 may be disposed on the ground, or may be disposed on water by installing it on a ship or a floating island. The carbon dioxide gas isolation apparatus 100 includes a gas introduction unit 10, a water intake unit 20, a bubble generation unit 30, a sedimentation pipe 40, and a control unit 50.

[0009] The gas introduction unit 10 introduces a gas containing carbon dioxide gas into the carbon dioxide gas isolation apparatus 100. The gas introduction unit 10 includes, for example, a pipe and a valve connected to a pipeline or a tank for transporting carbon dioxide gas.

[0010] The gas introduction unit 10 is provided with a flow rate measurement unit 11 and a first concentration measurement unit 12. The flow rate measurement unit 11 includes a flow sensor that measures the flow rate of the gas introduced by the gas introduction unit 10. The first concentration measurement unit 12 includes a carbon dioxide gas sensor that measures the concentration of carbon dioxide gas in the gas introduced by the gas introduction unit 10. Information representing the gas flow rate measured by the flow rate measurement unit 11 and information representing the carbon dioxide gas concentration measured by the first concentration measurement unit 12 are output to the control unit 50.

[0011] The water intake section 20 takes in water from the water area 90. The water intake section 20 includes, for example, pipes and pumps for pumping water from the water area 90. The water taken in from the water area 90 is seawater or fresh water. Note that the water intake section 20 may take in water from a water area different from the water area 90 where the carbon dioxide gas separation device 100 is installed or from a water source through pipelines or tanks.

[0012] The water intake section 20 is provided with a cooling section 21. The cooling section 21 cools the water taken in by the water intake section 20. In the present embodiment, the cooling section 21 reduces the temperature of the water taken in from the water intake section 20 to the water temperature at the outlet of the sedimentation pipe 40 described later. As the cooling section 21, for example, a chiller can be used. As shown in FIG. 2, carbon dioxide gas (CO 2 ) is known to dissolve more in water as the water temperature is lower.

[0013] The bubble generation section 30 generates bubbles of the gas introduced by the gas introduction section 10 in the water taken in by the water intake section 20. The bubble generation section 30 generates bubbles of a size that causes Brownian motion. Bubbles of a size that causes Brownian motion stay in water without rising for a long period of several weeks to several months while making irregular movements. The size that causes Brownian motion is less than 1 μm in diameter. Bubbles with a diameter of less than 1 μm are called ultrafine bubbles. Whether Brownian motion occurs and the size of the bubbles can be analyzed, for example, by the particle trajectory analysis method (PTA method). The bubble generation section 30 of the present embodiment is a pressure dissolution type ultrafine bubble generator. As the bubble generation section 30, in addition, a high-speed swirling liquid flow type ultrafine bubble generator can be used. Note that bubbles with a diameter larger than that of ultrafine bubbles and less than 100 μm and more than 1 μm in diameter are called microbubbles. Ultrafine bubbles have the property of being less likely to rise than microbubbles.

[0014] The downcomer 40 is a pipe that sends water containing the bubbles generated by the bubble generation unit 30 into the water area 90. The outlet of the downcomer 40 is arranged, for example, in a shallow sea area within a water depth of 200 m. Note that the outlet of the downcomer 40 may be arranged in the deep sea exceeding a water depth of 200 m. A water temperature sensor 41 is provided near the outlet of the downcomer 40. "Near the outlet" means, for example, an area within a radius of 10 m from the outlet of the downcomer 40. Hereinafter, the water discharged from the downcomer 40 is referred to as "carbon dioxide-containing water". The carbon dioxide-containing water may contain carbon dioxide in both a state dissolved in water and a state of bubbles. In order to suppress the intake of the carbon dioxide-containing water discharged from the downcomer 40 by the intake unit 20, it is preferable that the outlet of the downcomer 40 is provided at a position deeper than the position where the intake unit 20 takes water from the water area 90.

[0015] The control unit 50 is a device that comprehensively controls the operations of each part of the carbon dioxide separation device 100 described above, such as the bubble generation unit 30 and the cooling unit 21. The control unit 50 includes a CPU and a memory, and functions as a calculation unit 51 and an output unit 52 by executing a predetermined program stored in the memory. Note that the control unit 50, the calculation unit 51, and the output unit 52 may be configured by a circuit.

[0016] The calculation unit 51 acquires the gas flow rate measured by the flow rate measurement unit 11 and the carbon dioxide concentration measured by the first concentration measurement unit 12, and calculates the amount of carbon dioxide introduced into the bubble generation unit 30 based on these.

[0017] The output unit 52 outputs information representing the introduced amount of carbon dioxide calculated by the calculation unit 51. In the present embodiment, the output unit 52 outputs information representing the introduced amount of carbon dioxide to an external server device 200 using a predetermined communication line such as an Internet line. Note that the system including the carbon dioxide separation device 100 and the server device 200 can be referred to as a "carbon dioxide separation system".

[0018] FIG. 3 is a flowchart of the carbon dioxide separation process executed by the control unit 50. This process is a process executed when a predetermined instruction is received from the administrator of the carbon dioxide separation device 100, and the carbon dioxide separation method is realized by this process.

[0019] In step S10, the control unit 50 starts the intake of water by the water intake unit 20 and the introduction of gas by the gas introduction unit 10, and drives the bubble generation unit 30 to start discharging carbon dioxide-containing water containing ultrafine-bubbled carbon dioxide from the sedimentation tube 40.

[0020] In step S11, the control unit 50 measures the water temperature near the outlet of the sedimentation tube 40 using the water temperature sensor 41. Then, in step S12, the control unit 50 controls the cooling unit 21 to cool the water so that the water taken in by the water intake unit 20 drops to the water temperature measured by the water temperature sensor 41. In this specification, "lowering to the water temperature measured by the water temperature sensor 41" means lowering the temperature of the water within a range of an error of about +0 to -10°C with respect to the water temperature measured by the water temperature sensor 41.

[0021] In step S13, the calculation unit 51 calculates the introduction amount of the carbon dioxide introduced into the carbon dioxide separation device 100 based on the information representing the gas flow rate acquired from the flow rate measurement unit 11 and the information representing the carbon dioxide concentration acquired from the first concentration measurement unit 12. Specifically, the calculation unit 51 calculates the introduction amount of the carbon dioxide by time-integrating the product of the gas flow rate and the carbon dioxide concentration for a predetermined period. The predetermined period is, for example, a period such as one day, one week, one month, or one year.

[0022] In step S14, the output unit 52 outputs information representing the introduced amount of carbon dioxide gas calculated by the calculation unit 51. In the present embodiment, the output unit 52 outputs information representing the introduced amount of carbon dioxide gas to an external server device 200 using a predetermined communication line such as an Internet line. Based on the information output from the output unit 52, the server device 200 performs display, distribution, etc. of the introduced amount of carbon dioxide gas introduced into the carbon dioxide gas separation device 100.

[0023] In step S15, the control unit 50 determines whether or not it has received a stop instruction for the carbon dioxide gas separation process from the administrator. In step S15, if it is determined that the stop instruction has been received, the control unit 50 ends the carbon dioxide gas separation process. In step S15, if it is not determined that the stop instruction has been received, the control unit 50 returns the process to step S11 and continues to discharge the carbon dioxide gas-containing water.

[0024] According to the carbon dioxide gas separation device 100 of the present embodiment described above, since the size of the bubbles containing the carbon dioxide gas generated by the bubble generation unit 30 is the size at which Brownian motion occurs, the bubbles of the carbon dioxide gas released into the water area 90 do not rise in the water due to Brownian motion, and the possibility of staying in the water area 90 increases. Therefore, in order to suppress the rise of the bubbles, it is not necessary to perform pressure feeding with a large pressure, and the carbon dioxide gas can be separated into the water area 90 by a simple method.

[0025] Also, in this embodiment, in order to generate ultra-fine bubbles with a diameter of less than 1 μm as bubbles, the ratio of the surface area to the volume of the bubbles increases. Therefore, the carbon dioxide gas in the bubbles is more likely to dissolve in water, and the carbon dioxide-containing water discharged from the outlet of the sedimentation tube 40 becomes heavier than the surrounding water. As a result, the carbon dioxide-containing water can be sent to the deep area of the water area 90 without power, and the energy required for carbon dioxide isolation can be reduced. In particular, in this embodiment, the cooling unit 21 lowers the temperature of the water containing carbon dioxide gas. As shown in FIG. 2, the lower the water temperature, the more carbon dioxide gas dissolves in water. Therefore, by lowering the water temperature to the water temperature near the outlet of the sedimentation tube 40 by the cooling unit 21, a large amount of carbon dioxide gas can be dissolved in water, thereby increasing the specific gravity of the carbon dioxide-containing water. Then, the carbon dioxide-containing water can be easily gravity-settled, so that carbon dioxide gas can be efficiently isolated into the water area 90. Further, in this embodiment, since the cooling unit 21 is provided in the water intake unit 20, carbon dioxide gas can be dissolved in water more efficiently than when the cooling unit 21 is provided in other parts.

[0026] Also, in this embodiment, in order to output information representing the amount of carbon dioxide gas supplied to the bubble generation unit 30 to the external server device 200, it is easy for the administrator or a third party to confirm the amount of carbon dioxide gas introduced into the carbon dioxide isolation device 100.

[0027] Note that, in this embodiment, the output unit 52 outputs information representing the introduced amount of carbon dioxide gas to the server device 200. On the other hand, the output unit 52 may output information representing the introduced amount of carbon dioxide gas to a display device connected to the control unit 50 for display. In this case, the server device 200 may not be connected to the control unit 50.

[0028] B. Second Embodiment: FIG. 4 is an explanatory diagram showing a schematic configuration of a carbon dioxide isolation device 101 in the second embodiment. The carbon dioxide isolation device 101 in the second embodiment is different from the carbon dioxide isolation device 100 of the first embodiment in that it includes a second concentration measurement unit 60.

[0029] In the second embodiment, the second concentration measurement unit 60 is disposed near the water surface of the water area 90 and measures the concentration of carbon dioxide gas near the water surface. A plurality of second concentration measurement units 60 are arranged near the water surface and are each connected to the control unit 50. Each second concentration measurement unit 60 is provided, for example, on a buoy floating on the water surface. The number and range in which the second concentration measurement unit 60 is arranged are determined according to the area of the water surface where the bubbles of a specified size or more are discharged from the sedimentation pipe 40 and may rise. Note that "near the water surface" refers to, for example, the range within 10 m from the water surface to the sky.

[0030] FIG. 5 is a flowchart of the carbon dioxide gas separation process executed by the control unit 50 in the second embodiment. In step S20, the control unit 50 starts the water intake by the water intake unit 20 and the gas introduction by the gas introduction unit 10, drives the bubble generation unit 30, and starts discharging carbon dioxide gas-containing water containing ultra-fine bubbled carbon dioxide gas from the sedimentation pipe 40.

[0031] In step S21, the control unit 50 measures the water temperature near the outlet of the sedimentation pipe 40 using the water temperature sensor 41. Then, in step S22, the control unit 50 controls the cooling unit 21 to cool the water so that the water taken in by the water intake unit 20 drops to the water temperature measured by the water temperature sensor 41.

[0032] In step S23, the calculation unit 51 calculates the introduction amount of the carbon dioxide gas introduced into the carbon dioxide gas separation device 100 based on the information representing the gas flow rate acquired from the flow rate measurement unit 11 and the information representing the carbon dioxide gas concentration acquired from the first concentration measurement unit 12. Specifically, similar to the first embodiment, the calculation unit 51 calculates the introduction amount of the carbon dioxide gas by time-integrating the product of the gas flow rate and the carbon dioxide gas concentration for a predetermined period.

[0033] In step S24, the calculation unit 51 calculates the amount of carbon dioxide gas isolated in the water area 90 based on the amount of carbon dioxide gas introduced calculated in step S23 and the increase in the concentration of carbon dioxide gas measured by the second concentration measurement unit 60. Specifically, the calculation unit 51 acquires information representing the carbon dioxide gas concentration near the water surface from each second concentration measurement unit 60, and from the product of the increase in the carbon dioxide gas concentration during the above-described period and the space volume covered by the second concentration measurement unit 60, obtains the amount of increase in carbon dioxide gas in the area where each second concentration measurement unit 60 is arranged. Then, by summing up the amounts of increase in carbon dioxide gas calculated for each second concentration measurement unit 60, the amount of increase in carbon dioxide gas in the entire area where the plurality of second concentration measurement units 60 are arranged is calculated. The calculation unit 51 calculates the amount of isolation of carbon dioxide gas isolated in the water area 90 by subtracting the total amount of increase in carbon dioxide gas thus calculated from the amount of carbon dioxide gas introduced calculated in step S23.

[0034] In step S25, the output unit 52 outputs information representing the amount of carbon dioxide gas isolated calculated by the calculation unit 51. In the present embodiment, the output unit 52 outputs information representing the amount of carbon dioxide gas isolated to an external server device 200 using a predetermined communication line such as an Internet line. The server device 200 performs display, distribution, etc. of the amount of carbon dioxide gas isolated based on the information output from the output unit 52.

[0035] In step S26, the control unit 50 determines whether or not a stop instruction for the carbon dioxide gas isolation process has been received from the administrator. In step S26, if it is determined that a stop instruction has been received, the control unit 50 ends the carbon dioxide gas isolation process. In step S26, if it is not determined that a stop instruction has been received, the control unit 50 returns the process to step S21 and continues to discharge the carbon dioxide gas-containing water.

[0036] According to the carbon dioxide gas isolation device 100 of the second embodiment described above, by measuring the increase in the concentration of carbon dioxide gas near the water surface with the second concentration measurement unit 60, the amount of carbon dioxide gas isolated in the water area 90 can be accurately calculated.

[0037] In addition, in this embodiment, a plurality of second concentration measurement units 60 are arranged near the water surface. However, the number of the second concentration measurement units 60 is not limited to a plurality and may be one. For example, the carbon dioxide concentration at a representative position near the water surface of the water area 90 is measured by one second concentration measurement unit 60, and by using a function or a map representing the relationship between the increase amount of the carbon dioxide concentration at the representative position and the increase amount of the carbon dioxide in the entire area where bubbles may rise, the increase amount of the carbon dioxide in the entire area may be estimated.

[0038] In the second embodiment, the server device 200 may be an emission trading server that conducts carbon dioxide emission trading. In this case, the output unit 52 outputs information representing the carbon dioxide isolation amount to the server device 200 as information representing the credit used for carbon dioxide emission trading. A client device that conducts emission trading is connected to the server device 200 through a predetermined communication line such as an Internet line. Each client device can obtain a carbon dioxide emission quota by accessing the server device 200 and purchasing credits. In the second embodiment, since the carbon dioxide isolation amount in which the carbon dioxide is isolated in the water area 90 is calculated instead of the carbon dioxide introduction amount in which the carbon dioxide is introduced into the carbon dioxide isolation device 100, the credit used for emission trading can be accurately obtained.

[0039] C. Other Embodiments: (C-1) In the above-described embodiment, the cooling unit 21 is provided in the water intake unit 20. In contrast, the cooling unit 21 may be provided in the bubble generation unit 30 or the sedimentation pipe 40. Also, the cooling unit 21 can be omitted. When the cooling unit 21 is omitted, the water intake unit 20 takes in water with a low water temperature from a water depth approximately the same as the water depth at which the outlet of the sedimentation pipe 40 is provided, making it easier for carbon dioxide gas to dissolve in the water. When the water intake unit 20 takes in water from a water depth approximately the same as the water depth at the outlet of the sedimentation pipe 40, it is preferable that the water intake unit 20 takes in water from upstream of the outlet of the sedimentation pipe 40. This is because if water is taken in from downstream of the outlet of the sedimentation pipe 40, there is a high possibility that carbon dioxide gas has already dissolved in the water. When the carbon dioxide gas separation device 100 is installed on a ship, by providing the sedimentation pipe 40 at the stern and the water intake unit 20 near the bow, the water intake unit 20 can take in water from upstream of the outlet of the sedimentation pipe 40.

[0040] (C-2) In the above-described embodiment, the water temperature sensor 41 is provided in the sedimentation pipe 40, and the control unit 50 controls the cooling unit 21 according to the water temperature measured by the water temperature sensor 41. In contrast, the carbon dioxide gas separation device 100 may not be provided with the water temperature sensor 41. In this case, the cooling unit 21 reduces the temperature of the water taken in by the water intake unit 20 to a preset water temperature. The water temperature to be set is not limited to the water temperature at the water depth where the outlet of the sedimentation pipe 40 is provided, and can be any water temperature as long as it is lower than the water temperature immediately after the water intake unit 20 takes in water.

[0041] (C-3) In the above-described embodiment, the carbon dioxide gas supplied to the bubble generation unit 30 does not have to be high-purity carbon dioxide gas. For example, low-purity carbon dioxide gas discharged in large quantities from a fixed emission source such as a thermal power plant may be used. By using such low-purity carbon dioxide gas, there is no need to perform pretreatment such as high-purity separation, so a large amount of energy is not consumed, and carbon dioxide gas separation can be realized at low cost.

[0042] (C-4) In the above-described embodiment, the gas introduced by the gas introduction unit 10 may be air containing carbon dioxide. In this case, if the amount of carbon dioxide isolated is calculated according to the carbon dioxide concentration in the air and the isolated amount is output to the emission trading server described in the second embodiment, emission trading can be performed without incurring the energy and cost for transporting carbon dioxide.

[0043] (C-5) In the above-described embodiment, when the gas introduced by the gas introduction unit 10 contains methane, the concentration of methane may be measured, and the amount of methane isolated may be calculated from the gas flow rate. Methane has a higher greenhouse effect than carbon dioxide, and the global warming potential is 25 for methane while it is 1 for carbon dioxide. Therefore, the amount of methane isolated may be multiplied by the global warming potential to be converted into the amount of carbon dioxide isolated, and the above-described emission trading may be performed.

[0044] The present disclosure is not limited to the above-described embodiments, and can be realized in various configurations without departing from the gist thereof. For example, the technical features in the embodiments corresponding to the technical features in each form described in the summary of the invention can be appropriately replaced or combined in order to solve part or all of the above-described problems, or to achieve part or all of the above-described effects. Further, if the technical feature is not described as essential in this specification, it can be appropriately deleted.

Description of Reference Numerals

[0045] 10... gas introduction unit, 11... flow rate measurement unit, 12... first concentration measurement unit, 20... water intake unit, 21... cooling unit, 30... bubble generation unit, 40... sedimentation pipe, 41... water temperature sensor, 50... control unit, 51... calculation unit, 52... output unit, 60... second concentration measurement unit, 90... water area, 100, 101... carbon dioxide isolation device, 200... server device

Claims

1. A carbon dioxide gas isolation device for isolating carbon dioxide gas in a water area, comprising: a gas introduction part for introducing a gas containing carbon dioxide gas; a flow rate measurement part for measuring the flow rate of the gas introduced by the gas introduction part; a first concentration measurement part for measuring the concentration of the carbon dioxide gas in the gas; a water intake part for taking in water from the water area; a bubble generation part for generating bubbles of the gas introduced by the gas introduction part in the water taken in by the water intake part; a sedimentation pipe for sending the water containing the bubbles into the water area; a second concentration measurement part for measuring the concentration of carbon dioxide gas near the water surface of the water area; calculating the amount of carbon dioxide gas introduced into the bubble generation part based on the flow rate measured by the flow rate measurement part and the concentration measured by the first concentration measurement part, and calculating the isolation amount of the carbon dioxide gas isolated in the water area based on the calculated introduction amount of the carbon dioxide gas and the increase amount of the concentration of the carbon dioxide gas measured by the second concentration measurement part; an output part for outputting information representing the calculated isolation amount; and the bubble generation part generates bubbles having a size that causes Brownian motion as the bubbles, the carbon dioxide gas isolation device.

2. The carbon dioxide gas isolation device according to claim 1, wherein the size of the bubbles is less than 1 μm in diameter, the carbon dioxide gas isolation device.

3. The carbon dioxide gas isolation device according to claim 1 or claim 2, further comprising a cooling part for cooling the water, the carbon dioxide gas isolation device.

4. The carbon dioxide gas isolation device according to claim 3, wherein the cooling part is provided in the water intake part, the carbon dioxide gas isolation device.

5. The carbon dioxide gas isolation device according to claim 3 or claim 4, wherein the cooling part reduces the temperature of the water to the water temperature of the water area near the outlet of the sedimentation pipe, the carbon dioxide gas isolation device.

6. The carbon dioxide gas isolation device according to any one of claims 1 to 5, wherein the output part outputs the information representing the isolation amount to an emission trading server as information representing a credit used for carbon dioxide emission trading, the carbon dioxide gas isolation device.

7. A carbon dioxide gas isolation method for isolating carbon dioxide gas in a water area, comprising: introducing a gas containing carbon dioxide gas by a gas introduction part; a flow rate measurement part measures the flow rate of the gas introduced by the gas introduction part; a first concentration measurement part measures the concentration of the carbon dioxide gas in the gas; taking in water from the water area by a water intake part; The bubble generation unit generates bubbles of the gas introduced by the gas introduction unit in the water taken in by the water intake unit. The water containing the bubbles is sent into the water area by a sedimentation pipe. The second concentration measurement unit measures the concentration of carbon dioxide gas near the water surface of the water area. Based on the flow rate measured by the flow rate measurement unit and the concentration measured by the first concentration measurement unit, the amount of the carbon dioxide gas introduced into the bubble generation unit is calculated. Based on the calculated introduction amount of the carbon dioxide gas and the increase amount of the concentration of the carbon dioxide gas measured by the second concentration measurement unit, the isolation amount of the carbon dioxide gas isolated in the water area is calculated. Information representing the calculated isolation amount is output. The bubble generation unit generates bubbles having a size that causes Brownian motion as the bubbles, and is a carbon dioxide gas isolation method.

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