Carbon dioxide recovery system

Abstract

To provide a carbon dioxide recovery system which can recover carbon dioxide from a low concentration carbon dioxide containing gas with low energy.SOLUTION: A carbon dioxide recovery system 1 according to the invention includes: a water ejector 20 which sets water as a drive fluid and a carbon dioxide containing gas as a suction fluid; a water storage tank 10 which temporarily stores water to be supplied to the water ejector 20; a water drum 30 which is provided at the downstream of the water ejector 20 and temporarily stores water that has passed through the water ejector 20 and the carbon dioxide containing gas which has been suctioned by the water ejector 20; and a carbon dioxide concentration device which is provided at the downstream of the water drum 30 and receives the carbon dioxide containing gas of a gas layer in the water ejector 30 to concentrate carbon dioxide. The water storage tank 10 is provided at a height such that a pressure needed for driving the water ejector 20 and the carbon dioxide concentration device can be secured as potential energy.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a carbon dioxide capture system for concentrating carbon dioxide from a carbon dioxide-containing gas. [Background technology]

[0002] The increase in atmospheric carbon dioxide concentration has been pointed out as a cause of climate change such as global warming, and progress is being made in the development of technologies to curb the increase in atmospheric carbon dioxide concentration, such as capturing carbon dioxide from fossil fuel combustion exhaust gases.In addition, Direct-Air-Capture (DAC) technology has also been developed, which directly reduces atmospheric carbon dioxide concentration by capturing carbon dioxide already present in the atmosphere, rather than at the time of carbon dioxide release into the atmosphere.

[0003] However, the carbon dioxide concentration in the atmosphere is approximately 400 ppm, which is two orders of magnitude lower than the carbon dioxide concentration in combustion exhaust gas (several mol%), so the amount of energy required per unit of carbon dioxide capture tends to be enormous. For this reason, even greater energy-saving technologies are required for DAC.

[0004] In this regard, Patent Document 1 discloses a technology for desorbing carbon dioxide adsorbed on a honeycomb rotor by passing atmospheric air through the honeycomb rotor containing a carbon dioxide adsorbent and passing a regeneration gas obtained by desorbing carbon dioxide from a carbon dioxide-containing gas through the honeycomb rotor. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2023-45570 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in Patent Document 1, a cooling water facility is required because a blower is used to circulate the gas, and steam is used to desorb carbon dioxide, which results in the problem of the facility becoming more complex and increasing energy consumption.

[0007] The present invention has been made to solve the above problems, and has an object to provide a carbon dioxide recovery system that can recover carbon dioxide from a gas containing low concentrations of carbon dioxide with low energy consumption. [Means for solving the problem]

[0008] (1) The carbon dioxide capture system according to the present invention comprises: a water ejector using water as a driving fluid and a carbon dioxide-containing gas as a suction fluid; a water tank that temporarily stores water to be supplied to the water ejector; a water drum provided downstream of the water ejector and configured to temporarily store the water that has passed through the water ejector and the carbon dioxide-containing gas that has been sucked by the water ejector; a carbon dioxide concentrator that is provided downstream of the water drum and receives the carbon dioxide-containing gas from the gas layer of the water drum and concentrates the carbon dioxide therein; The water tank is provided at a height that can secure the pressure required to drive the water ejector and the carbon dioxide concentrator as potential energy.

[0009] (2) The carbon dioxide capture system according to the present invention further comprises: a water ejector using water as a driving fluid and a carbon dioxide-containing gas as a suction fluid; a water tank provided at a position higher than the water ejector and configured to temporarily store water to be supplied to the water ejector; a water pump provided between the water ejector and the water tank to pressurize water supplied from the water tank to the water ejector; a water drum provided downstream of the water ejector and configured to temporarily store the water that has passed through the water ejector and the carbon dioxide-containing gas that has been sucked by the water ejector; and a carbon dioxide concentrator that is provided downstream of the water drum and receives carbon dioxide-containing gas in the gas layer of the water drum and concentrates the carbon dioxide.

[0010] (3) The carbon dioxide capture system according to the present invention further comprises: a water ejector using water as a driving fluid and a carbon dioxide-containing gas as a suction fluid; a carbon dioxide concentrator for suction fluid that concentrates carbon dioxide in the carbon dioxide-containing gas sucked into the water ejector; a water tank provided at a position higher than the water ejector and configured to temporarily store water to be supplied to the water ejector; a water drum provided downstream of the water ejector and configured to temporarily store the water that has passed through the water ejector and the carbon dioxide-containing gas that has been sucked by the water ejector; and a carbon dioxide concentrator that is provided downstream of the water drum and receives carbon dioxide-containing gas in the gas layer of the water drum and concentrates the carbon dioxide.

[0011] (4) In addition, in the device described in (3) above, the carbon dioxide concentrator for suction fluid is characterized in that it is configured to include a carbon dioxide separation membrane.

[0012] (5) The carbon dioxide capture system according to the present invention further comprises: a water ejector using water as a driving fluid and a carbon dioxide-containing gas as a suction fluid; a water tank provided at a position higher than the water ejector and configured to temporarily store water to be supplied to the water ejector; a water drum provided downstream of the water ejector and configured to temporarily store the water that has passed through the water ejector and the carbon dioxide-containing gas that has been sucked by the water ejector; a circulating water pump that pressurizes the water stored in the water drum and supplies the water to the water ejector; and a carbon dioxide concentrator that is provided downstream of the water drum and receives carbon dioxide-containing gas in the gas layer of the water drum and concentrates the carbon dioxide.

[0013] (6) The carbon dioxide capture system according to the present invention further comprises: a water ejector using water as a driving fluid and a carbon dioxide-containing gas as a suction fluid; a water tank provided at a position higher than the water ejector and configured to temporarily store water to be supplied to the water ejector; a water drum provided downstream of the water ejector and configured to temporarily store the water that has passed through the water ejector and the carbon dioxide-containing gas that has been sucked by the water ejector; an energy recovery device that recovers energy of the water discharged from the water drum to the outside; and a carbon dioxide concentrator that is provided downstream of the water drum and receives carbon dioxide-containing gas in the gas layer of the water drum and concentrates the carbon dioxide.

[0014] (7) In addition, in the device described in any one of (1) to (6) above, the carbon dioxide concentrator is characterized in that it is configured to include a carbon dioxide separation membrane.

[0015] (8) In addition, in the device described in any one of (1) to (6) above, the carbon dioxide concentrating device is characterized in that it is configured to include a multi-cylinder switching type carbon dioxide adsorption device. [Effects of the Invention]

[0016] According to the carbon dioxide recovery system of the present invention, carbon dioxide can be recovered from a low-concentration carbon dioxide-containing gas with low energy consumption. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a schematic diagram showing a carbon dioxide capture system according to a first embodiment of the present invention. [Figure 2] FIG. 10 is a schematic diagram showing a carbon dioxide capture system according to a second embodiment of the present invention. [Figure 3] FIG. 10 is a schematic diagram showing a carbon dioxide capture system according to a third embodiment of the present invention. [Figure 4] FIG. 10 is a schematic diagram showing a carbon dioxide capture system according to a fourth embodiment of the present invention. [Figure 5] FIG. 10 is a schematic diagram showing a carbon dioxide capture system according to a fifth embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] [Embodiment 1] First, the configuration and functions of the first embodiment of the present invention will be described with reference to FIG. The carbon dioxide capture system 1 according to the first embodiment of the present invention includes a water tank 10, a water ejector 20, a water drum 30, a dehumidifier 40, first and third carbon dioxide separation membranes 51 to 53, and a carbon dioxide adsorption / separation device 60. The first to third carbon dioxide separation membranes 51 to 53 and the carbon dioxide adsorption / separation device 60 correspond to the carbon dioxide concentrator of the present invention. In this embodiment, a configuration is described in which three carbon dioxide separation membranes, ie, first to third carbon dioxide separation membranes 51 to 53, are arranged in series, but the present invention is not limited to this.

[0019] The water tank 10 is a reservoir for pumped storage power generation that is installed at a height that can secure the pressure required to drive the water ejector 20, the first to third carbon dioxide separation membranes 51 to 53, and the carbon dioxide adsorption and separation device 60 as potential energy, and stores water in a state of high potential energy. Water is supplied to the water storage device 10 via a water supply line 71 .

[0020] The water ejector 20 is a typical ejector that creates a reduced pressure state using water supplied from a water ejector inlet line 72 as a driving fluid, and receives atmospheric air, which is a carbon dioxide-containing gas, from an atmospheric air receiving line 74 . A supply flow rate control valve 73, which is a remotely controlled butterfly valve, is provided in the water ejector inlet line 72 to adjust the flow rate of water supplied from the water tank 10 to the water ejector 20.

[0021] The water drum 30 is a vertical cylindrical drum provided downstream of the water ejector 20, and temporarily stores the water and air received from the water ejector outlet line 75. A water discharge line 77 for discharging water from the water drum 30 is provided with a discharge water amount adjustment valve 78 consisting of a remotely controlled butterfly valve, which adjusts the flow rate of water discharged from the water drum 30 .

[0022] The dehumidifier 40 is a typical pressure swing adsorption (PSA) type dryer that switches between multiple cylinders filled with dehumidifying materials such as zeolite. It receives gas from the gas layer in the water drum 30 through the water drum outlet gas line 76, dehumidifies it, and discharges it to the dry gas line 81.

[0023] The first to third carbon dioxide separation membranes 51 to 53 are membrane separation units formed by stacking carbon dioxide separation membranes made of polymeric materials, and utilize the differential pressure between the dry gas line 81 and the carbon dioxide-enriched gas line 84 to concentrate carbon dioxide from the dry gas flowing through the dry gas line 81 and discharge it as carbon dioxide-enriched gas to the carbon dioxide-enriched gas line 84.

[0024] The carbon dioxide adsorption separation device 60 is a typical temperature swing adsorption (TSA) type carbon dioxide adsorption device that uses multiple cylinders filled with dehumidifying material such as zeolite by switching between them, and adsorbs carbon dioxide from the carbon dioxide-enriched gas received from the carbon dioxide-enriched gas line 84, discharges the unadsorbed nitrogen and oxygen to the outside from the surplus gas line 85, and discharges the high-concentration carbon dioxide gas to the high-concentration carbon dioxide gas discharge line 86.

[0025] Next, the operation of the carbon dioxide capture system 1 according to this embodiment will be described. The carbon dioxide capture system 1 controls the supply flow rate adjustment valve 73 to a predetermined opening degree to supply water at a predetermined flow rate to the water ejector 20. In this embodiment, water is supplied to the water ejector 20 at a hydraulic head pressure of 1.2 MPaG by the water tank 10, for example.

[0026] The water supplied to the water ejector 20 creates a reduced pressure state by utilizing Bernoulli's principle as it flows at high speed through the small diameter portion inside the water ejector 20. As a result, atmospheric air is supplied to the water ejector 20 from the atmospheric air receiving line 74.

[0027] Inside the water ejector 20, the high-speed flowing water is mixed with air supplied from the air receiving line 74. As the diameter inside the water ejector 20 expands and the flow rate decreases, the pressure recovers to, for example, 0.5 MPaG, and the mixed air is compressed from atmospheric pressure to 0.5 MPaG.

[0028] At this time, the air is compressed while coming into contact with the water and being cooled, so the compression process of the air is close to isothermal compression, resulting in high compression efficiency. In the wake of the water ejector 20, a multiphase fluid of water and air flows through the water ejector outlet line 75 toward the water drum 30.

[0029] The multiphase fluid of water and air that flows into the water drum 30 becomes saturated at 0.5 MPaG and separates into a gas layer and a liquid layer. The water that flows into the water drum 30 is discharged to the outside via a water discharge line 77, with its flow rate regulated by a discharge water amount control valve 78. The air at 0.5 MPaG is discharged to the outside of the drum through a water drum outlet gas line 76.

[0030] The air discharged from the water drum outlet gas line 76 to the outside of the drum is supplied to the dehumidifier 40 at a pressure of 0.5 MPaG, where it is dehumidified to a dew point of approximately -70°C under atmospheric pressure, and then discharged to the dry gas line 81. It is assumed that the differential pressure in the dehumidifier 40 is 0.1 MPa and the pressure in the dry gas line 81 is 0.4 MPaG.

[0031] The dry gas discharged to the dry gas line 81 is supplied to the first carbon dioxide separation membrane 51, where carbon dioxide preferentially permeates at a differential pressure of 100 kPa and is discharged to the first carbon dioxide separation membrane outlet line 82. The non-permeating gas, which has a high ratio of nitrogen and oxygen, is discharged to the outside from the first carbon dioxide separation membrane non-permeating gas line 91.

[0032] The carbon dioxide concentration of the dry gas that has permeated the first carbon dioxide separation membrane 51 is increased from about 400 ppm in the atmosphere to 4000 ppm, which is ten times higher.

[0033] The dry gas discharged to the first carbon dioxide separation membrane outlet line 82 is supplied to the second carbon dioxide separation membrane 52 at a pressure of 0.3 MPaG, and carbon dioxide preferentially permeates at a differential pressure of 100 kPa, and is discharged to the second carbon dioxide separation membrane outlet line 83. The non-permeating gas, which has a high proportion of nitrogen and oxygen, is discharged to the outside through the second carbon dioxide separation membrane non-permeating gas line 92.

[0034] The carbon dioxide concentration of the dry gas that has permeated the second carbon dioxide separation membrane 52 is increased tenfold from about 4,000 ppm to 40,000 ppm, that is, to a concentration of about 4%.

[0035] The dry gas discharged to the second carbon dioxide separation membrane outlet line 83 is supplied to the third carbon dioxide separation membrane 53 at a pressure of 0.2 MPaG, and carbon dioxide preferentially permeates at a differential pressure of 100 kPa, and is discharged to the carbon dioxide-enriched gas line 84. The non-permeating gas, which has a high proportion of nitrogen and oxygen, is discharged to the outside from the third carbon dioxide separation membrane non-permeating gas line 93.

[0036] The carbon dioxide concentration of the dry gas that has permeated the third carbon dioxide separation membrane 53 is increased tenfold from about 4% to about 40%.

[0037] The carbon dioxide concentrated gas discharged to the carbon dioxide concentrated gas line 84 is supplied to the carbon dioxide adsorption / separation device 60 at a pressure of 0.1 MPaG, where the carbon dioxide concentration is increased to 95%, and the gas is discharged to the outside through the high concentration carbon dioxide gas discharge line 86.

[0038] According to the carbon dioxide capture system 1 of this embodiment, atmospheric air is taken in by utilizing the reduced pressure created in the ejector by utilizing the hydraulic head pressure based on the difference in elevation between the water tank 10 and the water ejector 20, and the differential pressure required for the first to third carbon dioxide separation membranes 51 to 53 and the carbon dioxide adsorption separation device 60 can be obtained by pressure recovery downstream of the water ejector 20, thereby significantly reducing the atmospheric pressure boost power required to concentrate carbon dioxide.

[0039] Furthermore, compared to compressing the atmosphere using electricity generated by pumped storage hydroelectric power generation, there is no loss of potential energy due to the power generation equipment, so the potential energy of water can be used more efficiently to concentrate carbon dioxide in the atmosphere.

[0040] Furthermore, according to the carbon dioxide capture system 1 of this embodiment, the pressure recovery process downstream of the water ejector 20 described above is carried out while in contact with water, which is close to isothermal compression, and therefore the air can be compressed efficiently.

[0041] In this embodiment, the water tank 10 has been described as a reservoir for pumped storage power generation, but it may also be a river, lake, waterfall, etc., or it may be an artificially created elevation difference, such as a water tank on the roof of a building or a rooftop pool.

[0042] Furthermore, in this embodiment, the water ejector 20 is described as receiving atmospheric air, but the water ejector 20 may receive any gas containing carbon dioxide, such as combustion exhaust gas from fossil fuels.

[0043] Furthermore, in this embodiment, the dehumidifier 40 has been described as a pressure swing adsorption (PSA) type dryer, but a thermal swing adsorption (TSA) type dryer in which the adsorbent is regenerated by heating may also be used.

[0044] Furthermore, in this embodiment, the first to third carbon dioxide separation membranes 51 to 53 have been described as membrane separation units in which carbon dioxide separation membranes made of polymeric materials are stacked, but inorganic materials such as zeolite may also be used, or hybrid membranes of both may also be used, and these may be selected appropriately according to the design conditions. Furthermore, although the first to third carbon dioxide separation membranes 51 to 53 are configured as three carbon dioxide separation membranes arranged in series, the number of carbon dioxide separation membranes is not limited to three and may be selected appropriately according to design conditions.

[0045] Furthermore, in the present embodiment, the non-permeated gas from the first to third carbon dioxide separation membranes 51 to 53 is described as being discharged to the outside, but it may also be used for cooling purposes within the system after being depressurized and lowered in temperature. For example, by cooling the water drum outlet gas flowing through the water drum outlet gas line 76, the moisture content can be reduced, thereby reducing the load on the dehumidifier 40. Furthermore, by cooling the water supplied to the water ejector 20, the heat associated with the compression of air can be efficiently removed.

[0046] [Embodiment 2] Next, the configuration and functions of the second embodiment will be described with reference to FIG. The same numbers are used for components having the same configurations and functions as those in the first embodiment. The carbon dioxide capture system 200 according to the second embodiment includes a water pump 210 .

[0047] The water pump 210 is a centrifugal pump that pressurizes the water supplied from the water tank 10 and discharges it to the water pump outlet line 271 .

[0048] Next, the operation of the carbon dioxide capture system 200 according to this embodiment will be described. The explanation of the same functions as those in the first embodiment will be omitted.

[0049] When the head pressure due to the difference in height between the water tank 10 and the water ejector 20 is lower than the differential pressure required for the water ejector 20 and the first to third carbon dioxide separation membranes 51 to 53, the water is pressurized by the water pump 210 and supplied to the water ejector 20.

[0050] For example, if the head pressure due to the difference in height between the water tank 10 and the water ejector 20 is only about 0.5 MPaG, the water pump 210 increases the pressure by 0.7 MPa and supplies the water to the water ejector 20 at a pressure of 1.2 MPaG.

[0051] According to the carbon dioxide capture system 200 of this embodiment, the pressure increase amount of the water pump 210 can be added to the head pressure due to the difference in elevation between the water tank 10 and the water ejector 20, so that the system can be installed on land where a sufficient difference in elevation between the water tank 10 and the water ejector 20 cannot be secured.

[0052] [Embodiment 3] Next, the configuration and functions of the third embodiment will be described with reference to FIG. Components having the same configurations and functions as those in the first and second embodiments are given the same numbers. The carbon dioxide capture system 300 according to the third embodiment has a carbon dioxide separation membrane for suction fluid 310. The carbon dioxide separation membrane for suction fluid 310 corresponds to the carbon dioxide concentrator for suction fluid of the present invention.

[0053] The carbon dioxide separation membrane 310 for suction fluid is a membrane separation unit made up of stacked carbon dioxide separation membranes made of polymeric material, and utilizes the differential pressure between the atmospheric air receiving line 74 and the carbon dioxide-enriched atmospheric air receiving line 372 to concentrate carbon dioxide from the atmospheric air and discharge it as carbon dioxide-enriched atmospheric air to the carbon dioxide-enriched atmospheric air receiving line 372.

[0054] Next, the operation of the carbon dioxide capture system 300 according to this embodiment will be described. Explanation of the same functions as those in the first and second embodiments will be omitted.

[0055] Due to the reduced pressure state generated in the water ejector 20, a pressure difference occurs between the upstream and downstream of the carbon dioxide separation membrane 310 for suction fluid. Using this pressure difference, the carbon dioxide concentration of the air supplied from the air receiving line 74 is increased from about 400 ppm to, for example, about 4000 ppm, and then the air is sucked into the water ejector 20. The non-permeating gas with a high ratio of nitrogen and oxygen is discharged to the outside from the carbon dioxide separation membrane non-permeating gas line 371 for suction fluid.

[0056] According to the carbon dioxide capture system 300 of this embodiment, the carbon dioxide concentration of the air drawn into the water ejector 20 can be increased by the carbon dioxide separation membrane for suction fluid 310, thereby reducing the power of the water pump 210 per unit mass of carbon dioxide. Furthermore, since the load on the first to third carbon dioxide separation membranes 51 to 53 and the carbon dioxide adsorption and separation device 60 can be reduced, it becomes possible to reduce the number of pieces of equipment installed.

[0057] [Embodiment 4] Next, the configuration and functions of the fourth embodiment will be described with reference to FIG. The same numbers are used for components having the same configurations and functions as those in the first to third embodiments. The carbon dioxide capture system 400 according to the fourth embodiment has a water circulation line 471 that branches off from the water discharge line 77 and circulates the water discharged from the water drum 30 to the water ejector inlet line 72, and the water circulation line 471 is provided with a circulating water pump 410, a water cooler 420, and a circulating water flow control valve 473.

[0058] The circulating water pump 410 is a centrifugal pump that pressurizes the water temporarily stored in the water drum 30 and supplies it to the water ejector inlet line 72 .

[0059] The water cooler 420 is a shell-and-tube type heat exchanger, and cools the circulating water pressurized by the circulating water pump 410 using a refrigerant (not shown).

[0060] The circulating water flow rate control valve 473 is a remotely controlled butterfly valve that adjusts the flow rate of the circulating water.

[0061] Next, the operation of the carbon dioxide capture system 400 according to this embodiment will be described. Explanation of the same functions as those in the first to third embodiments will be omitted.

[0062] The circulating water pump 410 pressurizes the water temporarily stored in the water drum 30 to a pressure of 0.5 MPaG and supplies it to the inlet (for example, 0.8 MPaG) of the water pump 210. The water pump 210 pressurizes both the water supplied from the water tank 10 and the water supplied from the circulating water pump 410 and supplies it to the water ejector 20.

[0063] When water is circulated, heat caused by the compression of atmospheric air accumulates in the circulating water, causing the temperature of the water to rise. Therefore, the circulating water is cooled by the water cooler 420 to maintain a constant temperature.

[0064] According to the carbon dioxide capture system 400 of this embodiment, the flow rate of water supplied to the water ejector 20 can be increased by the circulating water pump 410, so that the flow rate of air sucked into the water ejector 20 can be increased without being limited by the flow rate of water supplied from the water tank 10.

[0065] [Embodiment 5] Next, the configuration and functions of the fifth embodiment will be described with reference to FIG. The same numbers are used for components having the same configurations and functions as those in the first to fourth embodiments. The carbon dioxide capture system 500 according to the fifth embodiment further includes a water turbine 510 and a power generator 520 in addition to the configuration of the fourth embodiment.

[0066] The water turbine 510 is a Francis type water turbine, and is installed on the water discharge line 77. The generator 520 is a general three-phase generator, and converts the rotational motion of the water turbine 510 into electricity.

[0067] Next, the operation of the carbon dioxide capture system 500 according to this embodiment will be described. Explanation of the same functions as those in the first to fourth embodiments will be omitted.

[0068] The water turbine 510 converts the flow of water discharged from the water drum 30 to the outside into turbine rotation. The generator 520 generates electricity by rotating a power generating element with the rotation of the water turbine 510.

[0069] The electricity generated by the generator 520 is consumed by the water pump 210 , the circulating water pump 410 , the dehumidifier 40 , and the carbon dioxide adsorption / separation device 60 .

[0070] According to the carbon dioxide capture system 500 of this embodiment, the energy of the water that is discharged to the outside under pressure inside the water drum 30 can be recovered in the form of electricity by the water turbine 510 and the generator 520, thereby reducing the energy required to concentrate carbon dioxide.

[0071] In this embodiment, the water turbine 510 has been described as a Francis type water turbine, but it may be another type of water turbine, such as a Pelton type water turbine, a propeller type water turbine, or a cross-flow type water turbine. [Industrial Applicability]

[0072] INDUSTRIAL APPLICABILITY The present invention can be used as a carbon dioxide recovery system that can recover carbon dioxide from a gas containing low concentrations of carbon dioxide with low energy consumption. [Explanation of symbols]

[0073] 1 Carbon dioxide capture system (embodiment 1) 10 Water Tank 20 Water ejector 30 water drums 40 Dehumidifier 51 First carbon dioxide separation membrane 52 Second carbon dioxide separation membrane 53 The third carbon dioxide separation membrane 60 Carbon dioxide adsorption separation device 71 Water Supply Line 72 Water ejector inlet line 73 Supply flow control valve 74 Atmospheric Receiving Line 75 Water ejector outlet line 76 Water drum outlet gas line 77 Water Dispensing Line 78 Discharge water volume control valve 81 Dry gas line 82 First carbon dioxide separation membrane outlet line 83 Second carbon dioxide separation membrane outlet line 84 Carbon dioxide enrichment gas line 85 Surplus Gas Line 86 High concentration carbon dioxide gas discharge line 91 First carbon dioxide separation membrane non-permeable gas line 92 Second carbon dioxide separation membrane non-permeable gas line 93 Third carbon dioxide separation membrane non-permeable gas line 200 Carbon dioxide capture system (embodiment 2) 210 Water Pump 271 Water pump outlet line 300 Carbon dioxide recovery system (embodiment 3) 310 Carbon dioxide separation membrane for suction fluid 372 Carbon dioxide enriched atmospheric receiving line 400 Carbon dioxide capture system (embodiment 4) 410 Circulating Water Pump 420 water cooler 471 Water Circulation Line 473 Circulating water flow control valve 500 Carbon dioxide recovery system (embodiment 5) 510 Water Turbine 520 Generator

Claims

1. a water ejector using water as a driving fluid and a carbon dioxide-containing gas as a suction fluid; a water tank that temporarily stores water to be supplied to the water ejector; a water drum provided downstream of the water ejector and configured to temporarily store the water that has passed through the water ejector and the carbon dioxide-containing gas that has been sucked by the water ejector; a carbon dioxide concentrator that is provided downstream of the water drum and receives the carbon dioxide-containing gas from the gas layer of the water drum and concentrates the carbon dioxide therein; A carbon dioxide capture system, wherein the water tank is provided at a height that can secure the pressure required to drive the water ejector and the carbon dioxide concentrator as potential energy.

2. a water ejector using water as a driving fluid and a carbon dioxide-containing gas as a suction fluid; a water tank provided at a position higher than the water ejector and configured to temporarily store water to be supplied to the water ejector; a water pump provided between the water ejector and the water tank to pressurize water supplied from the water tank to the water ejector; a water drum provided downstream of the water ejector and configured to temporarily store the water that has passed through the water ejector and the carbon dioxide-containing gas that has been sucked by the water ejector; a carbon dioxide concentrator that is provided downstream of the water drum and receives carbon dioxide-containing gas from the gas layer of the water drum and concentrates the carbon dioxide.

3. a water ejector using water as a driving fluid and a carbon dioxide-containing gas as a suction fluid; a carbon dioxide concentrator for suction fluid that concentrates carbon dioxide in the carbon dioxide-containing gas sucked into the water ejector; a water tank provided at a position higher than the water ejector and configured to temporarily store water to be supplied to the water ejector; a water drum provided downstream of the water ejector and configured to temporarily store the water that has passed through the water ejector and the carbon dioxide-containing gas that has been sucked by the water ejector; a carbon dioxide concentrator that is provided downstream of the water drum and receives carbon dioxide-containing gas from the gas layer of the water drum and concentrates the carbon dioxide.

4. The carbon dioxide recovery system according to claim 3, wherein the carbon dioxide concentrator for suction fluid includes a carbon dioxide separation membrane.

5. a water ejector using water as a driving fluid and a carbon dioxide-containing gas as a suction fluid; a water tank provided at a position higher than the water ejector and configured to temporarily store water to be supplied to the water ejector; a water drum provided downstream of the water ejector and configured to temporarily store the water that has passed through the water ejector and the carbon dioxide-containing gas that has been sucked by the water ejector; a circulating water pump that pressurizes the water stored in the water drum and supplies the water to the water ejector; a carbon dioxide concentrator that is provided downstream of the water drum and receives carbon dioxide-containing gas from the gas layer of the water drum and concentrates the carbon dioxide.

6. a water ejector using water as a driving fluid and a carbon dioxide-containing gas as a suction fluid; a water tank provided at a position higher than the water ejector and configured to temporarily store water to be supplied to the water ejector; a water drum provided downstream of the water ejector and configured to temporarily store the water that has passed through the water ejector and the carbon dioxide-containing gas that has been sucked by the water ejector; an energy recovery device that recovers energy of the water discharged from the water drum to the outside; a carbon dioxide concentrator that is provided downstream of the water drum and receives carbon dioxide-containing gas from the gas layer of the water drum and concentrates the carbon dioxide.

7. 7. The carbon dioxide recovery system according to claim 1, wherein the carbon dioxide concentrator includes a carbon dioxide separation membrane.

8. 7. The carbon dioxide recovery system according to claim 1, wherein the carbon dioxide concentrator includes a multi-cylinder switching type carbon dioxide adsorption device.

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