Carbon dioxide recovery apparatus

Abstract

To provide a carbon dioxide recovery apparatus which enables highly efficient gas-liquid separation between a target gas and a carbon dioxide absorption solution.SOLUTION: A carbon dioxide recovery apparatus 10 includes: a carbon dioxide absorption tower 11 provided with carbon dioxide absorption chambers 52U, 52D which allow a target gas and a carbon dioxide absorption solution to pass therethrough; gas-liquid contact parts 62U, 62D which are disposed inside the carbon dioxide absorption chambers 52U, 52D, respectively, and which allow the target gas to pass through therein and allow the carbon dioxide absorption solution to infiltrate therein; gas-liquid separation parts 64U, 64D provided with respective gas-liquid separation chambers 645 which are spaces allowing the target gas after passing through the gas-liquid contact parts 62U, 62D to flow therein from below; and an intermediate shaft part 65 and an upper shaft part 61 which supply the carbon dioxide absorption solution to upper end parts approximately at respective rotation centers of the gas-liquid contact parts 62U, 62D, and which allow the target gas to flow out of the respective gas-liquid separation chambers 645 of the gas-liquid separation parts 64U, 64D.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a carbon dioxide capture device. [Background technology]

[0002] The carbon dioxide capture device disclosed in Patent Document 1 includes a substantially cylindrical rotating drum configured to allow fluid to pass through in the radial direction, and a nozzle configured to be able to eject a carbon dioxide absorbing solution (cleaning medium) toward the inner circumferential surface of the rotating drum. This carbon dioxide capture device is configured so that the carbon dioxide absorbing solution ejected from the nozzle toward the inner circumferential surface of the rotating drum moves from the inner circumferential side to the outer circumferential side of the rotating drum by the centrifugal force of the rotation of the rotating drum. For this reason, when gas (engine exhaust gas) flows from the radially outer side to the radially inner side of the rotating drum, the gas and the carbon dioxide absorbing solution come into countercurrent contact in the rotating drum, and the carbon dioxide contained in the gas is absorbed by the carbon dioxide absorbing solution. This carbon dioxide capture device is configured so that the gas that flows into the rotating drum from the radially outer side is discharged to the outside through a hollow shaft connected to the rotating drum.

[0003] However, in the configuration described in Patent Document 1, there is a risk that a part of the carbon dioxide absorbing solution ejected from the nozzle will be discharged to the outside through the hollow shaft together with the gas due to the gas flow that has flowed into the inside of the rotating drum. In addition, Patent Document 1 does not disclose gas-liquid separation of the gas and the carbon dioxide absorbing solution. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 61-278336 Summary of the Invention

[0005] (Problem to be solved by the invention) In view of the above circumstances, one object of the present invention is to provide a carbon dioxide recovery device capable of achieving highly efficient gas-liquid separation between a gas from which carbon dioxide is to be recovered and a carbon dioxide absorbing solution.

[0006] (Means for solving the problem) In order to achieve the above object, the carbon dioxide capture device according to the present invention comprises: A carbon dioxide capture device that captures carbon dioxide by absorbing carbon dioxide contained in a target gas into a carbon dioxide absorbing solution, a carbon dioxide absorption tower provided with a carbon dioxide absorption chamber which is a space through which the target gas supplied from the outside and the carbon dioxide absorbing solution supplied from the outside can pass; A gas-liquid contact section is disposed inside the carbon dioxide absorption chamber so as to rotate around an axis line substantially parallel to the vertical direction by a driving force of a driving force source, and is configured so that the target gas can pass through the inside and the carbon dioxide absorbing solution can permeate into the inside; A carbon dioxide absorbing solution supply unit configured to supply the carbon dioxide absorbing solution supplied from the outside to an upper end portion of the approximately rotation center of the gas-liquid contact unit; a gas-liquid separation section disposed above the gas-liquid contact section inside the carbon dioxide absorption chamber so as to rotate integrally with the gas-liquid contact section, the gas-liquid separation section being provided with a gas-liquid separation chamber which is a space into which the target gas that has passed through the gas-liquid contact section can flow in from below; a target gas outlet portion having one end located inside the gas-liquid separation chamber and approximately at the center of rotation of the gas-liquid separation portion, and configured so that the target gas present inside the gas-liquid separation chamber flows out from the one end; Equipped with.

[0007] In the carbon dioxide capture device according to the present invention, the target gas that has flowed into the carbon dioxide absorption chamber flows into the gas-liquid contact section from the outer periphery and the lower side thereof, then flows out of the gas-liquid contact section from the upper surface thereof, and flows into the internal space of the gas-liquid separation section from the lower side thereof. The target gas comes into gas-liquid contact with the carbon dioxide absorbing solution while passing through the gas-liquid contact section, and the carbon dioxide contained in the target gas is absorbed by the carbon dioxide absorbing solution. The target gas that has flowed into the internal space of the gas-liquid separation section flows out of the internal space of the gas-liquid separation section through one end of the target gas outflow section.

[0008] The gas-liquid contact section is a member configured so that the carbon dioxide absorbing solution can penetrate therein, whereas the inside of the gas-liquid separation section is a space (hollow), so the flow rate of the target gas that has flowed into the internal space of the gas-liquid separation section is lower than the flow rate while passing through the inside of the gas-liquid contact section. When the flow rate of the target gas is lower, the force that transports the mist and droplets of the carbon dioxide absorbing solution contained in the target gas is reduced, so that the mist and droplets of the carbon dioxide absorbing solution contained in the target gas are less likely to reach one end of the target gas outflow section. In addition, a swirling flow of the target gas is generated in the internal space of the gas-liquid separation section due to the rotation of the gas-liquid contact section. Then, the mist and droplets of the carbon dioxide absorbing solution contained in the target gas are subjected to centrifugal force due to the swirling flow, so that the mist and droplets of the carbon dioxide absorbing solution contained in the target gas are prevented or suppressed from moving toward one end of the target gas outflow section provided at the approximate center of rotation. Therefore, the efficiency of removing the carbon dioxide absorbing solution from the target gas in the gas-liquid separation section (ratio of the removed carbon dioxide absorbing solution to the amount of carbon dioxide absorbing solution contained in the target gas: efficiency of gas-liquid separation) can be increased. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of a carbon dioxide capture device according to this embodiment. [Diagram 2] FIG. 2 is a schematic diagram showing the configuration of the carbon dioxide absorption tower of the carbon dioxide capture device according to this embodiment. [Figure 3A] FIG. 3A is an enlarged view of part IIIA in FIG. [Figure 3B] FIG. 3B is an enlarged view of part IIIB in FIG. [Figure 4] FIG. 4 is a graph showing a schematic relationship between the L / G ratio and the rotation speed of the rotor. [Diagram 5] FIG. 5 is a schematic diagram showing the configuration of a carbon dioxide diffusion tower of a carbon dioxide capture apparatus according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described. In the following description, the carbon dioxide capture device will be abbreviated as "capture device", the carbon dioxide absorption tower will be abbreviated as "absorption tower", the carbon dioxide stripper tower (sometimes called "carbon dioxide regeneration tower") will be abbreviated as "stripping tower", and the carbon dioxide absorption solution will be abbreviated as "solution". Also, the gas that is the target of carbon dioxide capture by the capture device (i.e., gas containing carbon dioxide) will be referred to as "target gas". Also, in each drawing, the upper side of the capture device is indicated by an arrow Up, and the lower side of the capture device is indicated by an arrow Dw.

[0011] The target gas source is a device or facility that generates a gas containing carbon dioxide. Specifically, the target gas source may be a metal melting furnace or a carburizing furnace that uses the heat of combustion of fossil fuels (i.e., uses fossil fuels as fuel). In this case, the target gas is the combustion exhaust gas of the fossil fuel. The solution is an aqueous amine solution.

[0012] <Configuration of the recovery device> 1 is a diagram showing a schematic configuration of a recovery apparatus 10 according to this embodiment. The recovery apparatus 10 according to this embodiment includes an absorption tower 11, a stripper tower 12a, a target gas introduction path 13, a target gas pump 14, a target gas discharge path 15, a first solution path 16, a second solution path 17, a first solution pump 18, a second solution pump 19, a heat exchanger 20, a reboiler 21, a carbon dioxide recovery path 22, a cooler 23, and a control device 24.

[0013] The absorption tower 11 is configured so that the solution absorbs carbon dioxide (in other words, carbon dioxide is removed from the target gas) by bringing the solution into gas-liquid contact with the target gas. Inside the absorption tower 11, an upper target gas chamber 51, an upper carbon dioxide absorption chamber 52U, an intermediate solution chamber 53, an intermediate target gas chamber 54, and a lower carbon dioxide absorption chamber 52D are provided in this order from the top. As described above, the absorption tower 11 of this embodiment is a multi-stage type (also called a multi-chamber type) equipped with a plurality of carbon dioxide absorption chambers 52U, 52D. In the drawings and the following description, an example in which the absorption tower 11 is a two-stage type is shown. In the following description, the "carbon dioxide absorption chamber" may be abbreviated to "absorption chamber".

[0014] The absorption tower 11 is configured so that the solution fed from the stripper tower 12a via the second solution path 17 passes through the upper absorption chamber 52U, the intermediate target gas chamber 54, and the lower absorption chamber 52D in one direction, and is discharged from the lower absorption chamber 52D to the outside of the absorption tower 11 (specifically, is fed to the stripper tower 12a). The absorption tower 11 is also configured so that the target gas fed from the target gas source 90 via the target gas introduction path 13 passes through the lower absorption chamber 52D, the intermediate target gas chamber 54, the upper absorption chamber 52U, and the upper target gas chamber 51 in the opposite direction to the one direction, and is discharged from the upper target gas chamber 51 to the outside of the absorption tower 11. Inside the absorption chambers 52U and 52D of each stage, the gas-liquid contact units 62U and 62D of each stage and the gas-liquid separation units 64U and 64D of each stage of the rotor 60 described later are rotatably arranged. The gas-liquid contacting section 62U, 62D of each stage is a section for promoting gas-liquid contact between the solution and the target gas inside the absorption chamber 52U, 52D of each stage. The gas-liquid separating section 64U, 64D of each stage is a section for removing the solution contained in the target gas flowing out of the absorption chamber 52U, 52D of each stage from the target gas (i.e., gas-liquid separation). The configuration of the absorption tower 11 will be described in detail later.

[0015] The target gas introduction path 13 is a path for supplying the target gas generated in the target gas source 90 to the absorption tower 11. One end of the target gas introduction path 13 is connected to the lower absorption chamber 52D of the absorption tower 11, and the other end is connected to the target gas source 90. The target gas pump 14 is provided on the target gas introduction path 13. The target gas pump 14 is configured to supply (pressurize) the target gas (target gas generated in the target gas source 90) on the other end side of the target gas introduction path 13 to one end side of the target gas introduction path 13 (the lower absorption chamber 52D of the absorption tower 11) by operating. A known electric gas supply pump can be used as the target gas pump 14.

[0016] The target gas discharge path 15 is a path for discharging the target gas (sometimes referred to as off-gas) after carbon dioxide has been absorbed in the absorption tower 11 to the outside of the absorption tower 11. One end of the target gas discharge path 15 is connected to the upper target gas chamber 51 of the absorption tower 11, and the other end is, for example, open to the atmosphere.

[0017] The first solution path 16 is a path for supplying the solution from the absorption tower 11 to the stripper tower 12a. One end of the first solution path 16 is connected to the lower absorption chamber 52D of the absorption tower 11, and the other end is connected to the stripper tower 12a. A first solution pump 18 and a heat exchanger 20 are provided on the first solution path 16.

[0018] The first solution pump 18 is configured to operate to feed the solution from the lower absorption chamber 52D of the absorption tower 11 toward the stripper tower 12a. The configuration of the first solution pump 18 is not particularly limited, and various conventionally known electric liquid-feed pumps can be applied.

[0019] The heat exchanger 20 is configured to exchange heat between the solution flowing through the first solution path 16 and the solution flowing through the second solution path 17. By exchanging heat between the solution flowing through the first solution path 16 and the solution flowing through the second solution path 17, the solution flowing through the first solution path 16 is heated and the solution flowing through the second solution path 17 is cooled. The configuration of the heat exchanger 20 is not limited, and various conventionally known heat exchangers can be applied.

[0020] The stripper tower 12a is configured to strip carbon dioxide from the solution by heating the solution. An upper filler 121 and a lower filler 122 are disposed inside the stripper tower 12a. Both the upper filler 121 and the lower filler 122 are members through which the solution can permeate and through which gas (steam and carbon dioxide) can pass, and for example, a porous metal or mesh-like member having a large specific surface area is applied. The lower filler 122 is a member for promoting gas-liquid contact between the solution and the steam generated by heating the solution. The upper filler 121 is disposed near the top of the stripper tower 12a, and the lower filler 122 is disposed below it. The other end of the first solution path 16 is connected between the upper filler 121 and the lower filler 122 at the top of the stripper tower 12a, and the other end of the second solution path 17 is connected below the lower filler 122 at the bottom of the stripper tower 12a (or near it). The configuration of the stripper tower 12a is not particularly limited, and a conventionally known configuration can be applied.

[0021] The reboiler 21 is configured to generate steam at a predetermined temperature (specifically, a temperature at which the solution fed to the stripper tower 12a can be heated to a temperature at which a reaction for stripping carbon dioxide occurs) by heating the solution stored inside (at the bottom) of the stripper tower 12a. Specifically, the reboiler 21 is connected to the bottom of the stripper tower 12a via a first reboiler path 31 and a second reboiler path 32. The reboiler 21 heats the solution flowing in through the first reboiler path 31 to generate steam. The steam generated in the reboiler 21 flows into the stripper tower 12a via the second reboiler path 32.

[0022] One end of the carbon dioxide capture path 22 is connected to the top of the stripping tower 12a (or its vicinity) and above the upper packing material 121. A demister 33, a mixed gas cooler 34, and a gas-liquid separator 35 are connected to the carbon dioxide capture path 22 in this order from the side closer to the stripping tower 12a. The demister 33 is configured to remove the mist of the solution vapor from the mixed gas of the solution vapor and carbon dioxide, and return the condensed water generated by the removed mist to the stripping tower 12a. The mixed gas cooler 34 is configured to liquefy the solution vapor by cooling the mixed gas of the solution vapor and carbon dioxide. The gas-liquid separator 35 is configured to separate the solution and carbon dioxide generated by the liquefaction of the vapor. With this configuration, gaseous carbon dioxide can be separated from the mixed gas of the solution vapor and carbon dioxide flowing into the carbon dioxide capture path 22. The separated carbon dioxide is discharged (recovered) to the outside of the recovery device 10. The gas-liquid separator 35 and the stripping tower 12a are connected by a solution return path 36. The solution return path 36 is configured so that the solution separated from the carbon dioxide in the gas-liquid separator 35 returns to the stripping tower 12a.

[0023] The second solution path 17 is a path for supplying the solution from the stripper tower 12a to the absorption tower 11. One end of the second solution path 17 is connected to the upper absorption chamber 52U of the absorption tower 11, and the other end of the second solution path 17 is connected to the bottom of the stripper tower 12a. A second solution pump 19, the above-mentioned heat exchanger 20, and a cooler 23 are provided on the second solution path 17.

[0024] The second solution pump 19 is configured to operate to feed the solution accumulated inside (specifically, at the bottom) of the stripping tower 12a to the absorption tower 11 (specifically, to the upper absorption chamber 52U of the absorption tower 11) through the second solution path 17. A known electric liquid feed pump can be used as the second solution pump 19.

[0025] The cooler 23 is configured to adjust (cool) the temperature of the solution fed to the absorption tower 11 to a temperature at which a reaction for absorbing carbon dioxide occurs. As the cooler 23, various known coolers are used.

[0026] The control device 24 is connected to the target gas pump 14, the first solution pump 18, the second solution pump 19, the reboiler 21, the intermediate solution pump 56 (described later), and the driving force source 67 (described later), and can control these. The control device 24 is a device including a computer equipped with a CPU, RAM, ROM, and I / F. The ROM stores a computer program for controlling the recovery device 10 including each of the above devices in advance. The CPU then reads out the computer program stored in the ROM, expands it into the RAM (using the RAM as a work area), and executes it. This controls the recovery device 10.

[0027] <Operation of the recovery device> Next, the operation of the recovery device 10 will be described.

[0028] The target gas generated in the target gas source 90 is fed (pressurized) to the lower absorption chamber 52D of the absorption tower 11 by the operation of the target gas pump 14. The target gas flowing into the lower absorption chamber 52D passes through the lower absorption chamber 52D, the intermediate target gas chamber 54, the upper absorption chamber 52U, and the upper target gas chamber 51 in sequence. In addition, the solution whose temperature has been adjusted (cooled) to a temperature suitable for absorbing carbon dioxide in the heat exchanger 20 and the cooler 23 flows into the upper absorption chamber 52U of the absorption tower 11 through the second solution path 17 by the operation of the second solution pump 19. The solution that flows into the upper absorption chamber 52U passes through the upper gas-liquid contact section 62U described later and temporarily accumulates at the bottom of the upper absorption chamber 52U, and then is fed to the intermediate solution chamber 53 by the operation of the intermediate solution pump 56, and further flows into the lower absorption chamber 52D. The absorbing liquid that has flowed into the lower absorption chamber 52D accumulates at the bottom of the lower absorption chamber 52D.

[0029] Then, the solution and the target gas come into gas-liquid contact in the gas-liquid contacting parts 62U, 62D arranged in the absorption chambers 52U, 52D of each stage, and carbon dioxide contained in the target gas is absorbed into the solution. Therefore, the concentration of carbon dioxide contained in the target gas decreases successively as the solution passes through the lower absorption chamber 52D and the upper absorption chamber 52U. Meanwhile, while the solution flows through the upper absorption chamber 52U and the lower absorption chamber 52D, the absorption ratio of carbon dioxide in the solution increases successively (the carbon dioxide loading value increases). That is, the solution goes from a carbon dioxide lean state to a carbon dioxide rich state. The target gas from which carbon dioxide has been removed (sometimes referred to as off-gas) is discharged from the upper absorption chamber 52U to the outside of the absorption tower 11 through the upper target gas chamber 51 and the target gas discharge path 15. The solution accumulated at the bottom of the lower absorption chamber 52D is fed from the absorption tower 11 to the stripping tower 12a through the first solution path 16 by the operation of the first solution pump 18. The solution flowing through the first solution path 16 is heated by heat exchange with the solution flowing through the second solution path 17 in the heat exchanger 20, and then is sent to the stripping tower 12a.

[0030] The solution that has flowed into the stripper 12a passes through the lower packing 122 and accumulates at the bottom of the stripper 12a. A part of the solution that has accumulated at the bottom of the stripper 12a flows into the reboiler 21 through the first reboiler passage 31 and is heated by the reboiler 21. The steam generated in the reboiler 21 flows into the inside of the stripper 12a through the second reboiler passage 32, and then passes through the lower packing 122 while rising from the bottom of the stripper 12a. Then, the steam comes into gas-liquid contact (countercurrent contact) with the solution flowing down from the top of the lower packing 122. As a result, the solution flowing down the lower packing 122 is heated, and carbon dioxide is stripped from the solution.

[0031] The mixture of carbon dioxide stripped from the solution and the remaining unliquefied steam passes through the upper filler 121 and flows into the carbon dioxide capture path 22 from the top of the stripping tower 12a. The upper filler 121 is a porous or mesh-like member. Therefore, when the mixture passes through the upper filler 121, the mist contained in the mixture is removed to a certain extent.

[0032] In the demister 33 provided in the carbon dioxide capture path 22, steam mist is removed from the mixed gas flowing into the carbon dioxide capture path 22. Furthermore, the mixed gas is cooled in the mixed gas cooler 34, so that the steam is condensed (liquefied). Then, in the gas-liquid separator 35, the mixed gas is separated into gaseous carbon dioxide and a liquid solution. The carbon dioxide separated in the gas-liquid separator 35 is discharged to the outside via the carbon dioxide capture path 22. That is, the carbon dioxide is captured via the carbon dioxide capture path 22. On the other hand, the solution separated in the gas-liquid separator 35 returns to the stripping tower 12a through the solution return path 36 and flows down the upper filler 121. As a result, the upper filler 121 is cooled, and the condensation of the steam contained in the mixed gas passing through the upper filler 121 is promoted.

[0033] The solution accumulated at the bottom of the stripper tower 12a is fed from the stripper tower 12a to the absorption tower 11 through the second solution path 17 by the operation of the second solution pump 19. The solution flowing through the second solution path 17 is cooled by heat exchange with the solution flowing through the first solution path 16 in the heat exchanger 20, and is further cooled by releasing heat in the cooler 23. As a result, the solution reaches a temperature suitable for absorbing carbon dioxide. The solution then flows into the upper absorption chamber 52U of the absorption tower 11.

[0034] In this manner, the operation of the first solution pump 18 and the second solution pump 19 causes the solution to circulate through the absorption tower 11, the first solution path 16, the stripper tower 12a, and the second solution path 17 in this order. During circulation, the solution repeats a reaction in which it absorbs carbon dioxide contained in the target gas in the absorption chambers 52U, 52D of each stage of the absorption tower 11 and strips the absorbed carbon dioxide in the stripper tower 12a. The carbon dioxide stripped from the solution in the stripper tower 12a is discharged from the recovery device 10 via the carbon dioxide recovery path 22.

[0035] <Configuration and operation of the absorption tower> Next, the configuration and operation of the absorption tower 11 will be described. FIG. 2 is a cross-sectional view showing the configuration of the absorption tower 11. FIG. 3A is an enlarged view of part IIIA in FIG. 2, and FIG. 3B is an enlarged view of part IIIB in FIG. 2. As shown in FIG. 2, the upper target gas chamber 51, the upper absorption chamber 52U, the intermediate solution chamber 53, the intermediate target gas chamber 54, and the lower absorption chamber 52D are provided in this order from the top inside the absorption tower 11. In addition, a rotor 60 is rotatably arranged inside the absorption tower 11. The rotor 60 is rotated by the driving force of a driving force source 67 arranged outside the absorption tower 11 (lower side in FIG. 2). The driving force source 67 is controlled by the control device 24. The driving force source 67 may be configured to output rotational power, and there is no particular limitation on the configuration of the driving force source 67. Various known motors can be applied to the driving force source 67.

[0036] Each of the absorption chambers 52U, 52D in each stage is a space through which the target gas and the solution can pass. Each of the absorption chambers 52U, 52D in each stage is configured to be able to store the solution at the bottom. Inside each of the absorption chambers 52U, 52D in each stage, the gas-liquid contact section 62U, 62D in each stage, the partition plate section 63U, 63D in each stage, and the gas-liquid separation section 64U, 64D in each stage, which are provided on the rotor 60, are rotatably arranged. One end of the target gas introduction path 13 is connected to the lower absorption chamber 52D, and the target gas fed from the target gas source 90 through the target gas introduction path 13 flows into the absorption chamber 52D in the lower stage. One end of the first solution path 16 is connected to the lower absorption chamber 52D, and the solution stored at the bottom of the lower absorption chamber 52D is fed to the stripping tower 12a through the first solution path 16.

[0037] The intermediate solution chamber 53 is a space provided adjacent to the lower side of the upper absorption chamber 52U. The intermediate solution chamber 53 is configured to be able to store a solution. The upper absorption chamber 52U and the intermediate solution chamber 53 are connected by an intermediate solution path 55. An intermediate solution pump 56 is provided on the intermediate solution path 55. The solution stored in the lower part of the upper absorption chamber 52U is fed to the intermediate solution chamber 53 through the intermediate solution path 55 by the operation of the intermediate solution pump 56. The configuration of the intermediate solution pump 56 is not particularly limited, and various known electric liquid feed pumps can be applied. The intermediate solution pump 56 is controlled by the control device 24.

[0038] The intermediate target gas chamber 54 is provided adjacent to the upper side of the lower absorption chamber 52D (in other words, between the lower absorption chamber 52D and the intermediate solution chamber 53). The lower absorption chamber 52D and the intermediate target gas chamber 54 communicate with each other via an intermediate shaft portion 65 (described later) of the rotor 60 so that the target gas can flow therethrough. The intermediate target gas chamber 54 and the upper absorption chamber 52U communicate with each other via an intermediate target gas path 57 so that the target gas can flow therethrough. Therefore, the target gas that flows from the lower absorption chamber 52D through the intermediate shaft portion 65 of the rotor 60 into the intermediate target gas chamber 54 passes through the intermediate target gas chamber 54 and flows into the upper absorption chamber 52U via the intermediate target gas path 57.

[0039] The upper target gas chamber 51 is provided adjacent to the upper absorption chamber 52U on the upper side. One end of the target gas discharge path 15 is connected to the upper target gas chamber 51. The upper target gas chamber 51 is also in communication with the upper absorption chamber 52U via an upper shaft portion 61 (described later) provided on the rotor 60 so that the target gas can flow therethrough (described later). For this reason, the target gas that flows from the upper absorption chamber 52U into the upper target gas chamber 51 through the upper shaft portion 61 of the rotor 60 passes through the inside of the upper target gas chamber 51 and flows out of the upper target gas chamber 51 (i.e., out of the absorption tower 11) through the target gas discharge path 15.

[0040] In this manner, the upper absorption chamber 52U and the lower absorption chamber 52D are connected in series via the intermediate target gas chamber 54 and the intermediate target gas path 57 so that the target gas supplied from the outside passes through in one predetermined direction (specifically, the direction from the lower absorption chamber 52D toward the upper absorption chamber 52U). The upper absorption chamber 52U and the lower absorption chamber 52D are connected in series via the intermediate solution chamber 53 and the intermediate solution path 55 so that the solution supplied from the outside passes through in the opposite direction to the above-mentioned predetermined direction (specifically, the direction from the upper absorption chamber 52U toward the lower absorption chamber 52D).

[0041] The rotor 60 includes, in order from the top, an upper shaft portion 61, an upper gas-liquid separation portion 64U, an upper partition plate portion 63U, an upper gas-liquid contact portion 62U, an intermediate shaft portion 65, a lower gas-liquid separation portion 64D, a lower partition plate portion 63D, a lower gas-liquid contact portion 62D, and a lower shaft portion 66. The above-mentioned portions of the rotor 60 are arranged coaxially and rotate together. The upper shaft portion 61, the intermediate shaft portion 65, and the lower shaft portion 66 are examples of the rotating shaft of the present invention.

[0042] The gas-liquid contacting parts 62U, 62D of each stage are members for promoting the absorption of carbon dioxide by the solution. It can also be said that the gas-liquid contacting parts 62U, 62D of each stage are members for increasing the contact area between the solution and the target gas. The gas-liquid contacting parts 62U, 62D of each stage are configured so that the solution can permeate and diffuse therein, and the target gas can flow therethrough. Specifically, the gas-liquid contacting parts 62U, 62D of each stage are configured so that the solution can permeate therein from the center of the upper surface (the upper end of the rotation center), and the permeated solution can flow down (fall) from the outer peripheral surface (the outer surface in the radial direction of the rotation) and the lower surface. The gas-liquid contacting parts 62U, 62D of each stage are configured so that the target gas can flow into the inside of the gas-liquid contacting parts 62U, 62D from the outer peripheral surface and the lower surface, and the target gas that has flowed in can flow upward from approximately the entire area of ​​the upper surface. For example, a metal member having a large specific surface area (more specifically, a porous member, a mesh member, or a cotton-like member) is applied to the gas-liquid contact parts 62U and 62D of each stage. Note that the gas-liquid contact parts 62U and 62D of each stage may include a member that houses or supports the metal member.

[0043] The gas-liquid separation section 64U, 64D of each stage is configured to separate a solution from the target gas passing through the gas-liquid contact section 62U, 62D of each stage (in other words, the target gas about to flow out from the absorption chamber 52U, 52D of each stage). The gas-liquid separation section 64U, 64D of each stage is disposed on the upper side of the gas-liquid contact section 62U, 62D of each stage. The gas-liquid separation section 64U, 64D of each stage includes a housing 641 and a tubular section 642. The housing 641 has a cylindrical container-like configuration with a bottom that is closed at the top and open at the bottom. Specifically, the housing 641 includes a flat upper plate section 643 that extends in a direction substantially perpendicular to the center of rotation (i.e., substantially horizontally) and a side plate section 644 that extends downward from the outer periphery of the upper plate section 643 when viewed in the vertical direction. The shape of the upper plate portion 643 as viewed in the vertical direction is not particularly limited, but in this embodiment, a substantially circular shape is applied. The dimensions of the gas-liquid separation portions 64U, 64D of each stage as viewed in the vertical direction are not particularly limited, but are preferably as large as possible, and may be dimensioned to overlap substantially the entire gas-liquid contact portions 62U, 62D of each stage as viewed from above. The space below the upper plate portion 643 and surrounded by the side plate portion 644 is the gas-liquid separation chamber 645.

[0044] Furthermore, the gas-liquid separation parts 64U, 64D of each stage include a plurality of blade parts 646. The blade parts 646 are members that generate a swirling flow (or increase the swirling flow) inside the gas-liquid separation chamber 645 by rotating. The plurality of blade parts 646 are provided, for example, so as to extend from the outer circumferential surface of the cylindrical part 642 toward the outside in the radial direction of rotation. The plurality of blade parts 646 may also be provided so as to extend from the inner circumferential surface of the side plate part 644 toward the inside in the radial direction of rotation.

[0045] The partition plate portion 63U, 63D of each stage is disposed between the gas-liquid contact portion 62U, 62D of each stage and the gas-liquid separation portion 64U, 64D of each stage. It can also be said that the partition plate portion 63U, 63D of each stage is a member that partitions (separates) the gas-liquid contact portion 62U, 62D of each stage and the gas-liquid separation portion 64U, 64D of each stage. The partition plate portion 63U, 63D of each stage is configured to allow the target gas to pass from the lower side to the upper side. For example, a porous metal plate, a metal mesh plate, or a punched metal can be applied to the partition plate portion 63U, 63D of each stage. In this embodiment, the partition plate portion 63U, 63D of each stage is configured to allow the target gas to pass from the lower side to the upper side over substantially the entire surface when viewed in the vertical direction. In addition, the partition plate portions 63U, 63D of each stage may be part of the gas-liquid contact portions 62U, 62D of each stage (members constituting the gas-liquid contact portions 62U, 62D of each stage) or part of the gas-liquid separation portions 64U, 64D of each stage (members constituting the gas-liquid separation portions 64U, 64D of each stage).

[0046] The upper shaft portion 61 is a portion located at the upper end of the rotor 60. The upper shaft portion 61 is an example of a carbon dioxide absorbing solution supply portion and a target gas outflow portion of the present invention. The upper shaft portion 61 has a double-tube structure. Specifically, the upper shaft portion 61 has a substantially cylindrical outer shaft portion 611 and an inner shaft portion 612, and the inner shaft portion 612 is disposed inside the outer shaft portion 611. The outer shaft portion 611 (more specifically, the space between the inner circumferential surface of the outer shaft portion 611 and the outer circumferential surface of the inner shaft portion 612) forms a path (the target gas outflow portion of the present invention) for the target gas (off-gas).

[0047] The upper end of the outer shaft portion 611 of the upper shaft portion 61 is located inside the upper target gas chamber 51, and the internal space of the outer shaft portion 611 (the space between the inner peripheral surface of the outer shaft portion 611 and the outer peripheral surface of the inner shaft portion 612) is in communication with the internal space of the upper target gas chamber 51. The inner shaft portion 612 is a cylindrical portion with both upper and lower ends open, and forms a solution path (the carbon dioxide absorbing solution supply portion of the present invention). The upper end of the inner shaft portion 612 of the upper shaft portion 61 protrudes upward from the upper end of the outer shaft portion 611 of the upper shaft portion 61, and is located outside the upper target gas chamber 51. One end of the second solution path 17 is connected to the upper end of the inner shaft portion 612 of the upper shaft portion 61.

[0048] The lower end of the upper shaft portion 61 and its vicinity are located inside the upper absorption chamber 52U. An upper gas-liquid contact portion 62U is disposed below the upper shaft portion 61. Furthermore, an upper gas-liquid separation portion 64U is disposed above the upper gas-liquid contact portion 62U so as to surround the vicinity of the lower end of the upper shaft portion 61. The upper shaft portion 61 is rotatably supported by the absorber tower 11 via a bearing.

[0049] The upper gas-liquid contacting section 62U is accommodated inside the upper absorption chamber 52U. The upper gas-liquid contacting section 62U is located below the lower end of the upper shaft section 61. Therefore, the solution flowing out from the lower end of the inner shaft section 612 of the upper shaft section 61 flows into the upper gas-liquid contacting section 62U from the approximate center of rotation on the upper surface of the upper gas-liquid contacting section 62U (the upper end of the rotation center of the upper gas-liquid contacting section 62U). The solution that has flowed into the upper gas-liquid contacting section 62U diffuses and permeates from the approximate center of rotation on the upper surface toward the outside and downward in the radial direction due to the centrifugal force and gravity of the rotation of the upper gas-liquid contacting section 62U. Then, the solution that has passed through the inside of the upper gas-liquid contacting section 62U flows down (falls) from the outer circumferential surface and the lower surface of the upper gas-liquid contacting section 62U.

[0050] The upper gas-liquid separation section 64U is disposed above the upper gas-liquid contact section 62U and the upper partition plate section 63U. A through hole penetrating in the vertical direction is provided at the center of the upper plate section 643 of the upper gas-liquid separation section 64U, and the lower end and its vicinity of the upper shaft section 61 enter the inside of the gas-liquid separation chamber 645 through the through hole provided in the upper plate section 643. A target gas path hole 613 is provided in a portion of the outer shaft section 611 of the upper shaft section 61 that enters the inside of the gas-liquid separation chamber 645. The target gas path hole 613 is a through hole (opening) that communicates between the inside of the outer shaft section (i.e., the space between the inner circumferential surface of the outer shaft section 611 and the outer circumferential surface of the inner shaft section 612) and the outside (i.e., the gas-liquid separation chamber 645) so that gas can pass through. The target gas path hole 613 is an example of an inlet of the present invention.

[0051] The cylindrical portion 642 of the upper gas-liquid separation portion 64U is provided so as to surround the periphery of the lower end of the upper shaft portion 61. Between the upper end of the cylindrical portion 642 and the lower surface of the upper plate portion 643, and between the inner peripheral surface of the cylindrical portion 642 and the outer peripheral surface of the lower end of the upper shaft portion 61, gaps through which the target gas can flow are provided. However, the gap between the inner peripheral surface of the cylindrical portion 642 and the outer peripheral surface of the lower end of the upper shaft portion 61 is closed at the lower end of the cylindrical portion 642. That is, the target gas and the solution cannot enter the gap between the inner peripheral surface of the cylindrical portion 642 and the outer peripheral surface of the lower end of the upper shaft portion 61 from the lower side of the cylindrical portion 642.

[0052] The cylindrical portion 642 of the upper gas-liquid separation unit 64U may be integrally provided (or joined) to the upper partition plate portion 63U. In this case, the cylindrical portion 642 of the upper gas-liquid separation unit 64U is configured to extend upward from the upper surface of the upper partition plate portion 63U. In this case, the portion of the upper partition plate portion 63U located between the inner peripheral surface of the cylindrical portion 642 and the outer peripheral surface of the lower end portion of the upper shaft portion 61 is configured so that the target gas and solution cannot pass through.

[0053] The upper end of the cylindrical portion 642 is located above the target gas path hole 613 of the upper shaft portion 61. Therefore, the target gas present in the gas-liquid separation chamber 645 of the upper gas-liquid separation portion 64U can flow into the interior of the upper shaft portion 61 through a gap between the upper end of the cylindrical portion 642 and the lower surface of the upper plate portion 643, a gap between the inner circumferential surface of the cylindrical portion 642 and the outer circumferential surface of the lower end of the upper shaft portion 61, and the target gas path hole 613 provided at the lower end of the upper shaft portion 61 (in other words, it can flow out from the upper gas-liquid separation portion 64U).

[0054] The intermediate shaft portion 65 is provided between the upper gas-liquid contact portion 62U and the lower gas-liquid contact portion 62D. The intermediate shaft portion 65 is a hollow shaft-shaped portion. The intermediate shaft portion 65 is an example of the carbon dioxide absorbing solution supply portion and the target gas outflow portion of the present invention. The upper portion of the intermediate shaft portion 65 is located inside the upper absorption chamber 52U. The upper end portion of the intermediate shaft portion 65 is joined to the lower portion of the upper gas-liquid contact portion 62U. The lower end portion of the intermediate shaft portion 65 and its vicinity are located inside the lower absorption chamber 52D. The lower gas-liquid contact portion 62D is disposed below the intermediate shaft portion 65, and the lower gas-liquid separation portion 64D is disposed so as to surround the lower end portion of the intermediate shaft portion 65 and its vicinity. The vertical middle portion of the intermediate shaft portion 65 is located inside the intermediate solution chamber 53 and the intermediate target gas chamber 54.

[0055] The intermediate shaft portion 65 has a cylindrical configuration with a space provided therein. The intermediate shaft portion 65 is rotatably supported by the absorption tower 11 via a bearing. The lower portion of the intermediate shaft portion 65 (a portion located inside the intermediate target gas chamber 54 and inside the lower absorption chamber 52D) has a double-tube structure. Specifically, the intermediate shaft portion 65 has a substantially cylindrical outer shaft portion 651 and an inner shaft portion 652, and the inner shaft portion 652 is disposed inside and below the outer shaft portion 651. In the upper portion of the intermediate shaft portion 65 (a portion located inside the intermediate solution chamber 53), the outer shaft portion 651 forms a solution path (a part of the carbon dioxide absorbing solution supply portion of the present invention). In the lower part of the intermediate shaft portion 65 (the part located inside the intermediate target gas chamber 54 and the lower absorption chamber 52D), the outer shaft portion 651 (specifically, the space between the inner peripheral surface of the outer shaft portion 651 and the outer peripheral surface of the inner shaft portion 652) forms a path for the target gas (the target gas outflow part of the present invention), and the inner shaft portion 652 (specifically, the internal space of the inner shaft portion 652) forms a path for the solution (a part of the carbon dioxide absorbing solution supply part of the present invention). The upper and lower ends of the inner shaft portion 652 are open, and the internal space of the outer shaft portion 651 at the upper part of the intermediate shaft portion 65 communicates with the internal space of the inner shaft portion 652 at the lower part. On the other hand, the upper and lower ends of the space between the outer shaft portion 651 and the inner shaft portion 652 are closed.

[0056] A lower gas-liquid contact section 62D is disposed below the intermediate shaft section 65, and a lower gas-liquid separation section 64D is disposed so as to surround the vicinity of the lower end of the intermediate shaft section 65. Therefore, the solution flowing out from the lower end of the inner shaft section 652 of the intermediate shaft section 65 is supplied to the lower gas-liquid contact section 62D from approximately the center of rotation of the upper surface of the lower gas-liquid contact section 62D (the upper end of approximately the center of rotation of the lower gas-liquid contact section 62D). The solution supplied to the lower gas-liquid contact section 62D diffuses and permeates from approximately the center of rotation of the upper surface toward the outside and downward in the radial direction due to the centrifugal force and gravity of the rotation of the lower gas-liquid contact section 62D. Then, the solution diffused and permeated inside the lower gas-liquid contact section 62D flows down (falls) from the outer circumferential surface and the lower surface of the lower gas-liquid contact section 62D. The solution that has flowed down from the outer peripheral surface and the bottom surface of the lower gas-liquid contact portion 62D accumulates at the bottom of the lower absorption chamber 52D.

[0057] A solution path hole 653 is provided in a portion of the intermediate shaft portion 65 located inside the intermediate solution chamber 53 and above the upper end of the inner shaft portion 652. The solution path hole 653 is a through hole that communicates between the outside and the inside of the outer shaft portion 651 of the intermediate shaft portion 65 so that the solution can pass through. Therefore, the solution stored in the intermediate solution chamber 53 flows into the interior of the intermediate shaft portion 65 through the solution path hole 653 provided in the intermediate shaft portion 65, and further flows down the interior of the inner shaft portion 652 and flows out from the lower end thereof. In addition, an upstream target gas path hole 654 is provided in a portion of the intermediate shaft portion 65 located inside the lower absorption chamber 52D, and a downstream target gas path hole 655 is provided in a portion of the intermediate shaft portion 65 located inside the intermediate target gas chamber 54. The upstream target gas path hole 654 and the downstream target gas path hole 655 are both through holes that communicate the outside of the outer shaft portion 651 with the inside of the outer shaft portion 651 (the space between the outer shaft portion 651 and the inner shaft portion 652) to allow the target gas to pass through. The upstream target gas path hole 654 is an example of an inlet of the present invention.

[0058] The lower shaft portion 66 is a generally cylindrical or round bar-shaped portion. A lower end of the lower shaft portion 66 protrudes to the outside of the absorber 11 and is connected to a driving force source 67 so that rotational power is transmitted from the driving force source 67. The lower shaft portion 66 is rotatably supported by the absorber 11 via a bearing.

[0059] The flow of the target gas in the absorption tower 11 equipped with the rotor 60 having such a configuration is as follows. The target gas that flows into the lower absorption chamber 52D through the target gas introduction path 13 flows into the lower gas-liquid contact section 62D from the outer circumferential surface and the lower surface of the lower gas-liquid contact section 62D, and passes through the inside of the lower gas-liquid contact section 62D. The target gas then flows out from the upper surface of the lower gas-liquid contact section 62D to the outside (upward) of the lower gas-liquid contact section 62D. When the target gas passes through the inside of the lower gas-liquid contact section 62D, it comes into contact with the solution that is diffusing and penetrating the inside of the lower gas-liquid contact section 62D, and carbon dioxide contained in the target gas is absorbed into the solution. On the other hand, when the target gas passes through the inside of the lower gas-liquid contact section 62D, it comes into contact with the solution, and may entrain mist or droplets of the solution. Therefore, the target gas flowing out of the lower gas-liquid contact section 62D may contain mist or droplets of the solution.

[0060] The target gas that has flowed out of the lower gas-liquid contact section 62D passes through the lower partition plate section 63D and flows into the gas-liquid separation chamber 645 of the lower gas-liquid separation section 64D. The target gas that has flowed into the lower gas-liquid separation chamber 645 flows through the gap between the cylindrical section 642 and the upper plate section 643 (in other words, over the upper end of the cylindrical section 642) into the gap between the inner circumferential surface of the cylindrical section 642 and the outer circumferential surface of the outer shaft section 651 of the intermediate shaft section 65. Then, while the target gas passes through the gas-liquid separation chamber 645 of the lower gas-liquid separation section 64D, the solution contained in the target gas is removed (described later). The target gas that has passed through the gas-liquid separation chamber 645 of the lower gas-liquid separation section 64D flows into the outer shaft section 651 through the upstream target gas path hole 654 provided at the lower end of the outer shaft section 651.

[0061] The target gas that has flowed into the outer shaft portion 651 of the intermediate shaft portion 65 flows into the intermediate target gas chamber 54 through the downstream target gas path hole 655 of the outer shaft portion 651 of the intermediate shaft portion 65, and further flows into the upper absorption chamber 52U through the intermediate target gas path 57. The target gas that has flowed into the upper absorption chamber 52U flows into the upper gas-liquid contact portion 62U from the outer peripheral surface and the lower surface of the upper gas-liquid contact portion 62U, passes through the interior of the upper gas-liquid contact portion 62U, and flows out (upward) from the upper surface of the upper gas-liquid contact portion 62U to the outside of the upper gas-liquid contact portion 62U. The target gas that has flowed out to the outside of the upper gas-liquid contact portion 62U passes through the upper partition plate portion 63U and flows into the gas-liquid separation chamber 645 of the upper gas-liquid separation portion 64U.

[0062] The target gas that has flowed into the upper gas-liquid separation chamber 645 flows through the gap between the cylindrical portion 642 and the upper plate portion 643 (in other words, over the upper end of the cylindrical portion 642) into the gap between the inner circumferential surface of the cylindrical portion 642 and the outer circumferential surface of the outer shaft portion 611 of the upper shaft portion 61, and further flows into the outer shaft portion 611 through the target gas passage hole 613 provided at the lower end of the outer shaft portion 611. Then, while the target gas passes through the gas-liquid separation chamber 645 of the upper gas-liquid separation portion 64U, the solution contained in the target gas is removed (described later). The target gas that has flowed into the outer shaft portion 611 flows into the upper target gas chamber 51 from the upper end of the outer shaft portion 611, and is further discharged from the upper target gas chamber 51 to the outside of the absorption tower 11 through the target gas discharge path 15.

[0063] Next, gas-liquid separation in the gas-liquid separation parts 64U, 64D of each stage will be described. The gas-liquid contact parts 62U, 62D of each stage are parts including porous members or mesh-like members as described above. On the other hand, the gas-liquid separation parts 64U, 64D of each stage do not have members such as the gas-liquid contact parts 62U, 62D of each stage, and the gas-liquid separation chamber 645 is simply a cavity. For this reason, the area (flow path cross-sectional area) of the space (gas, openings, etc.) through which the target gas can pass in a cross section cut by a plane perpendicular to the passing direction of the target gas (for example, a horizontal plane (a plane perpendicular to the center of rotation)) is larger in the gas-liquid separation parts 64U, 64D of each stage than in the gas-liquid contact parts 62U, 62D of each stage. For example, the porosity inside the gas-liquid separation chamber 645 of the gas-liquid separation parts 64U, 64D of each stage is larger than the porosity inside the gas-liquid contact parts 62U, 62D of each stage.

[0064] Therefore, the flow velocity of the target gas flowing inside the gas-liquid separation parts 64U, 64D of each stage is slower than the flow velocity of the target gas flowing inside the gas-liquid contact parts 62U, 62D of each stage. More specifically, the "flow velocity of the target gas from the lower side of the gas-liquid separation parts 64U, 64D of each stage toward the gap between the cylindrical part 642 and the upper plate part 643" in a side view is smaller than the "flow velocity of the target gas from the outer circumferential surface and the lower surface of the gas-liquid contact parts 62U, 62D of each stage toward the partition plate parts 63U, 63D of each stage of the gas-liquid contact parts 62U, 62D of each stage." Therefore, the mist and droplets of the solution entrained in the target gas are likely to fall by gravity during the period from when the target gas passes through the partition plate portions 63U, 63D of each stage and flows into the gas-liquid separation chambers 645 of the gas-liquid separation portions 64U, 64D of each stage until it reaches the gap between the cylindrical portion 642 and the upper plate portion 643 (while passing through the gas-liquid separation chambers 645 of the gas-liquid contact portions 62U, 62D of each stage). Therefore, the efficiency of gas-liquid separation can be improved.

[0065] Further, in the gas-liquid separation parts 64U, 64D of each stage, the gap between the cylindrical part 642 and the upper plate part 643 is provided at a position spaced above the partition plate part 63U, 63D of each stage (specifically, directly below the upper plate part 643). With this configuration, the distance from the partition plate part 63U, 63D of each stage (i.e., the lower end of the gas-liquid separation chamber 645) to the target gas path hole 613 or the downstream target gas path hole 655 of the intermediate shaft part 65 can be made larger than a configuration in which the cylindrical part 642 is not provided. That is, the distance over which the target gas flows inside the gas-liquid separation chamber 645 of the gas-liquid separation parts 64U, 64D of each stage can be made larger. Therefore, the solution contained in the target gas is easily removed from the target gas during the period from when the target gas flows into the gas-liquid separation chamber 645 to when the target gas reaches the target gas path hole 613 or the downstream target gas path hole 655.

[0066] Furthermore, when the flow rate of the target gas decreases, the force of the target gas to transport (float) the mist or droplets of the solution becomes weaker, so the mist or droplets of the solution contained in the target gas are less likely to rise (they are more likely to fall due to gravity). Therefore, the mist or droplets of the solution are prevented or suppressed from rising beyond the upper end of the cylindrical portion 642, and the efficiency of gas-liquid separation can be improved.

[0067] In this embodiment, the rotor 60 including the gas-liquid contactors 62U, 62D and the gas-liquid separators 64U, 64D is rotated by the driving force of the driving force source 67. According to this configuration, a swirling flow (a flow swirling around the axis of the rotor 60 in top view) is generated by the target gas flowing into the gas-liquid separators 64U, 64D of each stage, so that centrifugal force is applied to the mist and droplets of the solution contained in the target gas. Therefore, the mist and droplets contained in the target gas move radially outward by the centrifugal force and are separated (removed) from the target gas by adhering to the inner circumferential surface of the side plate portion 644. Even if the target gas flows radially inward while swirling, the mist and droplets contained in the target gas are prevented or suppressed from flowing out through the gap between the upper plate portion 643 and the baffle plate.

[0068] In addition, as in this embodiment, when the vane portion 646 is provided inside the gas-liquid separation unit 64U, 64D of each stage, a swirling flow is easily generated inside the gas-liquid separation unit 64U, 64D of each stage by the vane portion 646 (it can also be said that the flow rate of the swirling flow can be made larger than that of a configuration in which the vane portion 646 is not provided). Therefore, it is possible to enhance the effect of separating the mist or droplets of the solution from the target gas (further enhancing the efficiency of gas-liquid separation).

[0069] In this embodiment, the partition plate portion 63U, 63D is provided between the gas-liquid contact portion 62U, 62D of each stage and the gas-liquid separation portion 64U, 64D of each stage. With this configuration, the partition plate portion 63U, 63D of each stage can suppress the inflow of mist or droplets of the solution from the gas-liquid contact portion 62U, 62D of each stage into the gap between the gas-liquid separation portions 64U, 64D of each stage. Therefore, the efficiency of gas-liquid separation can be further improved.

[0070] In this embodiment, the absorption tower 11 has a multi-stage configuration. With this configuration, while the target gas flows through the lower absorption chamber 52D and the upper absorption chamber 52U, the carbon dioxide contained in the target gas is absorbed into the solution in each absorption chamber. Therefore, compared to the single-stage absorption tower 11, the carbon dioxide loading value of the solution can be made larger, so that a larger amount of carbon dioxide contained in the target gas can be absorbed. Therefore, the concentration of carbon dioxide contained in the target gas (off-gas) discharged from the absorption tower 11 can be kept low.

[0071] <Control of rotating objects> Next, the control of the rotor 60 will be described. Fig. 4 is a graph showing a schematic relationship between the rotation speed of the rotor 60 and the L / G ratio. The L / G ratio is a numerical value (ratio) expressed as the "flow rate of the solution per unit time" relative to the "flow rate of the target gas per unit time". When the L / G ratio changes, the dispersion state of the solution inside the gas-liquid contact parts 62U, 62D of each stage changes, and therefore the appropriate rotation speed for permeating the solution into the gas-liquid contact parts 62U, 62D of each stage changes.

[0072] Specifically, when the L / G ratio is small, the amount of solution flowing down from the upper side is small, so if the rotation speed of the rotor 60 is increased in this state, the solution flows in the outer circumferential direction at the upper part of the gas-liquid contact parts 62U, 62D of each stage, and it becomes difficult to permeate the lower part of the gas-liquid contact parts 62U, 62D of each stage (it becomes difficult to permeate the whole). Therefore, when the L / G ratio is small, the rotation speed of the rotor 60 is reduced. Then, as the L / G ratio increases, the rotation speed is increased, so that the solution can be uniformly dispersed inside the gas-liquid contact parts 62U, 62D of each stage. However, when the L / G ratio becomes large to a certain extent, the solution is uniformly dispersed inside the gas-liquid contact parts 62U, 62D of each stage without increasing the rotation speed. Therefore, in the range of the L / G ratio above a certain extent, the rotation speed is reduced as the L / G ratio increases. In this manner, in this embodiment, the rotation speed is controlled to be nonlinear with respect to the L / G ratio.

[0073] <Modification> Next, a modified example will be described. FIG. 5 is a schematic diagram showing the configuration of the stripper tower 12b of the recovery device 10 according to the modified example. As shown in FIG. 5, the stripper tower 12b of the recovery device 10 according to the modified example is provided with an exhaust gas chamber 123 and a stripper chamber 124 in this order from the top. In addition, a rotatable rotor 70 is disposed inside the stripper tower 12b of the recovery device 10, similar to the absorption tower 11 of the above embodiment. A driving force source 76 for the rotor 70 is disposed outside the stripper tower 12b. The rotor 70 includes an upper shaft portion 71, a gas-liquid contact portion 72, a partition plate portion 73, a gas-liquid separation portion 74, and a lower shaft portion 75. The upper shaft portion 71, the gas-liquid contact portion 72, the partition plate portion 73, the gas-liquid separation portion 74, and the lower shaft portion 75 can have the same configuration as the upper shaft portion 61, the gas-liquid contact portions 62U, 62D of each stage, the partition plate portions 63U, 63D of each stage, the gas-liquid separation portions 64U, 64D of each stage, and the lower shaft portion 66. That is, the gas-liquid separation portion 74 includes a housing 741, a cylindrical portion 742, an upper plate portion 743, a side plate portion 744, and a blade portion 746. The upper plate portion 743 and the side plate portion 744 form a gas-liquid separation chamber 745.

[0074] The other end of the first solution passage 16 is connected to the upper end of the inner shaft portion 712 of the upper shaft portion 71, and the solution that has absorbed carbon dioxide in the absorption tower 11 is supplied to the approximate center of rotation of the upper surface of the gas-liquid contact section 72 through the inner shaft portion 712. The solution supplied to the gas-liquid contact section 72 diffuses and permeates toward the outer periphery and downward due to centrifugal force and gravity. The solution that has passed through the gas-liquid contact section 72 flows down from the gas-liquid contact section 72 and accumulates at the bottom of the stripping chamber 124 of the stripping tower 12a. A part of the solution that has accumulated at the bottom of the stripping chamber 124 of the stripping tower 12a flows into the reboiler 21 through the first reboiler passage 31, and the steam generated in the reboiler 21 flows into the inside of the stripping chamber 124 of the stripping tower 12a through the second reboiler passage 32. The steam that has flowed into the stripping chamber 124 of the stripping tower 12a flows into the gas-liquid contact section 72 from the outer periphery and the bottom surface thereof, and passes through the inside of the gas-liquid contact section 72. Then, the steam and the solution come into gas-liquid contact inside the gas-liquid contact section 72, whereby the solution is heated and carbon dioxide is stripped from the solution.

[0075] The mixture of carbon dioxide and steam dissipated from the solution flows from the upper surface of the gas-liquid contact section 72 through the partition plate section 73 into the inside of the gas-liquid separation chamber 745 of the gas-liquid separation section 74. Then, the mixture of carbon dioxide and steam that has flowed into the inside of the gas-liquid separation chamber 745 flows into the inside of the upper shaft section 71 (the space between the outer shaft section 711 and the inner shaft section 712) through the gap between the cylindrical section 742 and the upper plate section 743, the gap between the inner peripheral surface of the cylindrical section 742 and the outer peripheral surface of the outer shaft section 711 of the upper shaft section 71, and the target gas path hole 713. Then, the mixture of carbon dioxide and steam passes through the outer shaft section 711 of the upper shaft section 71 and the exhaust gas chamber 123, and flows into the carbon dioxide capture path 22.

[0076] According to the recovery device 10 of the modified example, it is possible to improve the efficiency of gas-liquid separation because the liquid solution (mist or droplets of the solution) can be removed from the mixed gas of carbon dioxide and steam discharged from the diffusion chamber 124. Furthermore, according to the recovery device 10 of the modified example, the demister 33 does not need to be provided in the carbon dioxide recovery path 22.

[0077] <Summary of the embodiment> The carbon dioxide capture device 10 according to this embodiment is A carbon dioxide capture device 10 that captures carbon dioxide by absorbing carbon dioxide contained in a target gas into a carbon dioxide absorbing solution, A carbon dioxide absorption tower 11 is provided with carbon dioxide absorption chambers 52U and 52D, which are spaces through which a target gas supplied from the outside and a carbon dioxide absorbing solution supplied from the outside can pass; Gas-liquid contact sections 62U, 62D are arranged inside the carbon dioxide absorption chambers 52U, 52D so as to rotate around an axis line substantially parallel to the vertical direction by the driving force of a driving force source 67, and are configured so that the target gas can pass through the inside and the carbon dioxide absorbing solution can permeate into the inside; A carbon dioxide absorbing solution supply unit (upper shaft portion 61, intermediate shaft portion 65) configured to supply a carbon dioxide absorbing solution supplied from the outside to the upper end portion of the approximate rotation center of the gas-liquid contact portions 62U and 62D; A gas-liquid separation unit 64U, 64D is disposed above the gas-liquid contact unit 62U, 62D inside the carbon dioxide absorption chamber 52U, 52D so as to rotate integrally with the gas-liquid contact unit 62U, 62D, and is provided with a gas-liquid separation chamber 645, which is a space into which the target gas that has passed through the gas-liquid contact unit 62U, 62D can flow in from below; The gas-liquid separation chamber 645 is provided with a target gas outlet portion (upper shaft portion 61, intermediate shaft portion 65) whose one end is located inside the gas-liquid separation chamber 645 approximately at the center of rotation of the gas-liquid separation portions 64U, 64D and is configured so that the target gas present inside the gas-liquid separation chamber 645 flows out from the one end.

[0078] The target gas that has flowed into the carbon dioxide absorption chamber 52U, 52D flows into the gas-liquid contact section 62U, 62D from the outer periphery and the lower side, then flows out of the gas-liquid contact section 62U, 62D from the upper surface of the gas-liquid contact section 62U, 62D, and flows into the internal space (gas-liquid separation chamber 645) of the gas-liquid separation section 64U, 64D from the lower side. The target gas comes into gas-liquid contact with the carbon dioxide absorbing solution while passing through the gas-liquid contact section 62U, 62D, and the carbon dioxide contained in the target gas is absorbed by the carbon dioxide absorbing solution. The target gas that has flowed into the internal space (gas-liquid separation chamber 645) of the gas-liquid separation section 64U, 64D flows out of the internal space (gas-liquid separation chamber 645) of the gas-liquid separation section 64U, 64D through the target gas outflow section (upper shaft section 61, intermediate shaft section 65).

[0079] The gas-liquid contact parts 62U, 62D are formed of a material configured so that the carbon dioxide absorbing solution can permeate into the inside. On the other hand, since the internal space (gas-liquid separation chamber 645) of the gas-liquid separation parts 64U, 64D is hollow (in other words, the porosity of the gas-liquid contact parts 62U, 62D is smaller than the porosity of the internal space of the gas-liquid separation parts 64U, 64D), the flow rate of the target gas that has flowed into the internal space (gas-liquid separation chamber 645) of the gas-liquid separation parts 64U, 64D is lower than the flow rate while passing through the inside of the gas-liquid contact parts 62U, 62D. When the flow rate of the target gas is lowered, the force of the flow of the target gas to transport the mist and droplets of the carbon dioxide absorbing solution is reduced, so that the mist and droplets of the carbon dioxide absorbing solution contained in the target gas are less likely to reach one end of the target gas outflow part (upper shaft part 61, middle shaft part 65) (in other words, they fall by gravity before reaching the end). Therefore, the efficiency of removing the carbon dioxide absorbing solution from the target gas in the gas-liquid separation section (ratio of the amount of the removed carbon dioxide absorbing solution to the amount of the carbon dioxide absorbing solution contained in the target gas: efficiency of gas-liquid separation) can be increased.

[0080] Furthermore, a swirling flow of the target gas is generated in the internal space (gas-liquid separation chamber 645) of the gas-liquid separation units 64U, 64D by the rotation of the gas-liquid separation units 64U, 64D. Then, the centrifugal force caused by this swirling flow is applied to the mist and droplets of the carbon dioxide absorbing solution contained in the target gas, so that the mist and droplets of the carbon dioxide absorbing solution contained in the target gas are prevented or suppressed from moving toward one end of the target gas outlet unit (upper shaft unit 61, intermediate shaft unit 65) provided at the approximate center of rotation. Therefore, the efficiency of gas-liquid separation can be improved.

[0081] In the carbon dioxide capture device 10 according to this embodiment, The gas-liquid separation units 64U, 64D surround the outer periphery of one end of the target gas outflow portion (upper shaft portion 61, intermediate shaft portion 65) so that there is a gap between the outer periphery of the target gas outflow portion (upper shaft portion 61, intermediate shaft portion 65) and the outer periphery of the target gas outflow portion (upper shaft portion 61, intermediate shaft portion 65) through which the target gas can pass, and include a cylindrical portion 642 having an open upper end and a closed lower end. At one end of the target gas outlet section (upper shaft section 61, intermediate shaft section 65), a target gas inlet (target gas path hole 613, upstream target gas path hole 654) is provided at a position lower than the upper end of the cylindrical section 642.

[0082] According to this configuration, the flow path of the target gas in the internal space (gas-liquid separation chamber 645) of the gas-liquid separation unit 64U, 64D is longer than that in the configuration in which the cylindrical portion 642 is not provided. Therefore, the carbon dioxide absorbing solution contained in the target gas is less likely to reach one end of the target gas outlet portion (upper shaft portion 61, intermediate shaft portion 65). Therefore, the efficiency of gas-liquid separation can be improved. Also, according to this configuration, the target gas that has flowed into the internal space (gas-liquid separation chamber 645) of the gas-liquid separation unit 64U, 64D rises once and then flows into the target gas outlet portion (upper shaft portion 61, intermediate shaft portion 65). As described above, since the flow rate of the target gas is low, the mist and droplets of the carbon dioxide absorbing solution contained in the target gas are less likely to rise. Therefore, the mist and droplets of the carbon dioxide absorbing solution contained in the target gas are prevented or suppressed from exceeding the upper end of the cylindrical portion 642. Therefore, the efficiency of gas-liquid separation can be improved.

[0083] In the carbon dioxide capture device 10 according to this embodiment, The gas-liquid separators 64U, 64D include one or more plate-like portions (blade portions 646) extending radially outward from the outer circumferential surface of the cylindrical portion 642 when viewed in a direction substantially parallel to the axis and standing upright in the substantially vertical direction.

[0084] According to this configuration, a swirling flow is easily generated in the internal space (gas-liquid separation chamber 645) of the gas-liquid separation parts 64U and 64D by the rotation of the plate-shaped part (blade part 646) (it can also be said that the flow rate of the swirling flow is increased). Therefore, it is possible to enhance the effect of preventing or suppressing the movement of mist or droplets of the carbon dioxide absorbing solution contained in the target gas toward one end of the target gas outflow part (upper shaft part 61, middle shaft part 65).

[0085] In the carbon dioxide capture device 10 according to this embodiment, The separators 62U, 62D are provided between the gas-liquid contactors 62U, 62D and the gas-liquid separators 64U, 64D, and include porous or mesh-like plate sections (partition plate sections 63U, 63D at each stage) through which gas can pass in the substantially vertical direction.

[0086] According to such a configuration, the carbon dioxide absorbing solution passing through the gas-liquid contactors 62U, 62D from the upper surfaces of the gas-liquid contactors 62U, 62D and flowing into the gas-liquid separation sections 64U, 64D can be reduced. Therefore, the efficiency of gas-liquid separation can be improved.

[0087] In the carbon dioxide capture device 10 according to this embodiment, The carbon dioxide absorbing solution supply section (the inner shaft section 612 of the upper shaft section 61, and the inner shaft section 652 of the intermediate shaft section 65) and the target gas outflow section (the upper shaft section 61, the intermediate shaft section 65) have a cylindrical configuration with a space provided therein, At least a portion of the carbon dioxide absorbing solution supply section (the inner shaft portion 612 of the upper shaft portion 61, the inner shaft portion 652 of the intermediate shaft portion 65) is arranged approximately coaxially inside the target gas outflow section (the outer shaft portion 611 of the upper shaft portion 61, the outer shaft portion 651 of the intermediate shaft portion 65).

[0088] According to this configuration, the carbon dioxide absorbing solution can be supplied to the upper end of the approximate rotation center of the gas-liquid contact parts 62U, 62D through the carbon dioxide absorbing solution supply part (the inner shaft part 612 of the upper shaft part 61, the inner shaft part 652 of the intermediate shaft part 65). Therefore, the carbon dioxide absorbing solution can be diffused and permeated throughout the gas-liquid contact parts 62U, 62D by centrifugal force and gravity. Also, the target gas can be discharged from the approximate rotation center of the gas-liquid separation parts 64U, 64D. Also, according to this configuration, the flow distance of the target gas in the internal space (gas-liquid separation chamber 645) of the gas-liquid separation parts 64U, 64D can be increased compared to a configuration in which the cylindrical part 642 is not provided. Therefore, the efficiency of gas-liquid separation can be improved while increasing the amount of carbon dioxide absorbed from the target gas by increasing the area of ​​gas-liquid contact.

[0089] In the carbon dioxide capture device 10 according to this embodiment, The target gas outflow portion (upper shaft portion 61, intermediate shaft portion 65) is a rotating shaft that rotates by the driving force of a driving force source 67, The gas-liquid contact units 62U, 62D and the gas-liquid separation units 64U, 64D are rotatably supported with respect to the carbon dioxide absorption tower 11 by the target gas outflow unit (the upper shaft portion 61, the intermediate shaft portion 65).

[0090] According to such a configuration, since the target gas outflow portion (upper shaft portion 61, intermediate shaft portion 65) has a function as a rotating shaft (shaft member) that rotatably supports the gas-liquid contact portions 62U, 62D and the gas-liquid separation portions 64U, 64D, it is not necessary to separately arrange a rotating shaft that rotatably supports the gas-liquid contact portions 62U, 62D and the gas-liquid separation portions 64U, 64D. Therefore, it is possible to prevent or suppress an increase in the number of parts of the carbon dioxide absorption tower 11 and a complicated structure.

[0091] In the carbon dioxide capture device 10 according to this embodiment, A control device 24 is provided that can control the number of rotations per unit time of the driving force source 67. The control device 24 varies the rotation speeds per unit time of the gas-liquid contact units 62U, 62D and the gas-liquid separation units 64U, 64D in accordance with the ratio of the flow rate per unit time of the carbon dioxide absorbing solution to the flow rate per unit time of the target gas passing through the inside of the carbon dioxide absorption tower 11.

[0092] The manner in which the carbon dioxide absorbing solution permeates into the gas-liquid contact parts 62U, 62D differs depending on the L / G ratio (the ratio of the flow rate of the carbon dioxide absorbing solution per unit time to the flow rate of the target gas passing through the inside of the carbon dioxide absorption tower 11 per unit time). The manner in which the carbon dioxide absorbing solution permeates into the gas-liquid contact parts 62U, 62D also differs depending on the rotation speed per unit time of the gas-liquid contact parts 62U, 62D. Therefore, by changing the rotation speed of the gas-liquid contact parts 62U, 62D depending on the L / G ratio, the carbon dioxide absorbing solution can be diffused and permeated into a wide range (for example, into almost the entirety) of the gas-liquid contact parts 62U, 62D. In other words, the range in which the carbon dioxide absorbing solution permeates can be expanded. And, by expanding the range in which the carbon dioxide absorbing solution permeates, the area of ​​gas-liquid contact between the target gas and the carbon dioxide absorbing solution is expanded, so that the amount of carbon dioxide absorbed from the target gas can be increased.

[0093] In the carbon dioxide capture device 10 according to this embodiment, The carbon dioxide absorption tower 11 includes a plurality of carbon dioxide absorption chambers 52U and 52D. The multiple carbon dioxide absorption chambers 52U, 52D are connected in series with each other so that the target gas delivered from an external target gas source 90 passes through the multiple carbon dioxide absorption chambers 52U, 52D in one direction, and the carbon dioxide absorbing solution passes through the multiple carbon dioxide absorption chambers 52U, 52D in a direction opposite to the one direction and comes into contact with the target gas in each of the carbon dioxide absorption chambers 52U, 52D to absorb carbon dioxide contained in the target gas. A gas-liquid contact unit 62U, 62D and a gas-liquid separation unit 64U, 64D are disposed inside each of the carbon dioxide absorption chambers 52U, 52D. The gas-liquid contact sections 62U, 62D and the gas-liquid separation sections 64U, 64D disposed inside each of the carbon dioxide absorption chambers 52U, 52D are connected to each other so as to rotate coaxially and integrally, and are configured to rotate by a common driving force source 67.

[0094] In this way, when the carbon dioxide recovery device 10 is configured to include a multistage carbon dioxide absorption tower 11, the amount of carbon dioxide that can be absorbed in the carbon dioxide absorption tower 11 can be increased compared to a configuration including a single stage carbon dioxide absorption tower 11. When the gas-liquid contact units 62U, 62D and the gas-liquid separation units 64U, 64D are arranged inside each of the multiple carbon dioxide absorption chambers 52U, 52D, it is possible to prevent or suppress the carbon dioxide absorbing solution from returning from the lower absorption chamber 52D to the upper absorption chamber 52U. Note that in such a configuration, when the gas-liquid contact units 62U, 62D and the gas-liquid separation units 64U, 64D arranged inside each carbon dioxide absorption chamber 52U, 52D are connected to rotate integrally with each other and rotated by a single common driving force source 67, it is possible to prevent or suppress the structure of the carbon dioxide absorption tower 11 from becoming complicated and the number of parts from increasing.

[0095] Although the embodiment of the present invention and its modified examples have been described above, the technical scope of the present invention is not limited to the above-mentioned embodiment and modified examples. Various modifications of the present invention are possible without departing from the spirit of the present invention, and such modifications are also included in the technical scope of the present invention.

[0096] For example, in the above embodiment, an example has been shown in which the absorption tower 11 is of a two-stage type, but the number of stages (the number of absorption chambers) of the absorption tower 11 is not limited to two stages. For example, the absorption tower 11 may be of a one-stage type, or may be of a three-stage type or more. In addition, in the modified example, an example has been shown in which the stripper tower 12b is of a one-stage type, but the number of stages of the stripper tower 12b is also not limited to one stage. [Explanation of symbols]

[0097] 10...carbon dioxide capture device, 11...carbon dioxide absorption tower, 12a, 12b...carbon dioxide diffusion tower, 24...control device, 51...upper target gas chamber, 52U...upper carbon dioxide absorption chamber, 52D...lower carbon dioxide absorption chamber, 60...rotor, 61...upper shaft, 62U, 62D...gas-liquid contact section, 64U, 64D...gas-liquid separation section, 67...driving force source, 90...target gas source

Claims

1. A carbon dioxide capture device that captures carbon dioxide by absorbing carbon dioxide contained in a target gas into a carbon dioxide absorbing solution, a carbon dioxide absorption tower provided with a carbon dioxide absorption chamber which is a space through which the target gas supplied from the outside and the carbon dioxide absorbing solution supplied from the outside can pass; A gas-liquid contact section is disposed inside the carbon dioxide absorption chamber so as to rotate around an axis line substantially parallel to the vertical direction by a driving force of a driving force source, and is configured so that the target gas can pass through the inside and the carbon dioxide absorbing solution can permeate into the inside; A carbon dioxide absorbing solution supply unit configured to supply the carbon dioxide absorbing solution supplied from the outside to an upper end portion of the approximately rotation center of the gas-liquid contact unit; a gas-liquid separation section disposed above the gas-liquid contact section inside the carbon dioxide absorption chamber so as to rotate integrally with the gas-liquid contact section, the gas-liquid separation section being provided with a gas-liquid separation chamber which is a space into which the target gas that has passed through the gas-liquid contact section can flow in from below; a target gas outlet portion, one end of which is located inside the gas-liquid separation chamber and approximately at the center of rotation of the gas-liquid separation portion, and which is configured so that the target gas present inside the gas-liquid separation chamber flows out from the one end; A carbon dioxide capture device comprising:

2. The carbon dioxide capture device according to claim 1, the gas-liquid separation unit includes a cylindrical portion that surrounds an outer periphery of the one end of the target gas outflow portion so that a gap through which the target gas can pass is present between the outer periphery of the target gas outflow portion and the gas-liquid separation unit, and that has an open upper end and a closed lower end at which the gap is present; The one end of the target gas outlet portion is provided with an inlet for the target gas at a position lower than an upper end of the cylindrical portion. Carbon dioxide capture equipment.

3. The carbon dioxide capture device according to claim 2, The gas-liquid separation unit includes one or more plate-shaped portions extending from an outer circumferential surface of the cylindrical portion toward an outer side in a radial direction of rotation and standing upright in a substantially vertical direction when viewed in a direction substantially parallel to the axis. Carbon dioxide capture equipment.

4. The carbon dioxide capture device according to claim 1, a porous or mesh-like partition plate portion provided between the gas-liquid contact portion and the gas-liquid separation portion and allowing gas to pass through in a substantially vertical direction; Carbon dioxide capture equipment.

5. The carbon dioxide capture device according to claim 1, The carbon dioxide absorbing solution supply unit and the target gas outflow unit have a cylindrical configuration with a space provided therein, At least a part of the carbon dioxide absorbing solution supply unit is disposed substantially coaxially inside the target gas outflow unit. Carbon dioxide capture equipment.

6. The carbon dioxide capture device according to claim 5, the target gas outflow portion is a rotating shaft that rotates by the driving force of the driving force source, The gas-liquid contact section and the gas-liquid separation section are rotatably supported in the target gas outflow section. Carbon dioxide capture equipment.

7. The carbon dioxide capture device according to claim 1, a control device capable of controlling the number of rotations per unit time of the driving force source; The control device varies the rotation speeds per unit time of the gas-liquid contact unit and the gas-liquid separation unit in accordance with a ratio of a flow rate per unit time of the carbon dioxide absorbing solution to a flow rate per unit time of the target gas passing through the inside of the carbon dioxide absorption tower. Carbon dioxide capture equipment.

8. The carbon dioxide capture device according to any one of claims 1 to 7, The carbon dioxide absorption tower includes a plurality of the carbon dioxide absorption chambers, The plurality of carbon dioxide absorption chambers are connected in series with each other so that the target gas delivered from an external target gas source passes through the plurality of carbon dioxide absorption chambers in one direction, and the carbon dioxide absorbing solution passes through the plurality of carbon dioxide absorption chambers in a direction opposite to the one direction while contacting the target gas in each of the carbon dioxide absorption chambers, thereby absorbing carbon dioxide contained in the target gas; The gas-liquid contact section and the gas-liquid separation section are disposed inside each of the plurality of carbon dioxide absorption chambers, The gas-liquid contact unit and the gas-liquid separation unit arranged inside each of the plurality of carbon dioxide absorption chambers are connected to each other so as to rotate coaxially and integrally with each other, and are configured to be rotated by the common driving force source. Carbon dioxide capture equipment.

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