Carbon dioxide collection module

Abstract

To provide a carbon dioxide collection module which can increase an amount of collected carbon dioxide per unit time without increasing the cubic volume.SOLUTION: A carbon dioxide collection module 1 collects carbon dioxide and includes: an absorption part 2 having an absorber for absorbing carbon dioxide contained in air; and a filter part 3 which is located between the absorption part 2 and air around the carbon dioxide collection module 1, allows transmission of air, and prevents transmission of the absorber. The absorption part 2 can change the projection area of the absorption part 2 when viewed in an air flow direction by deforming its shape.SELECTED DRAWING: Figure 3

Description

[Technical field]

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

[0002] As a method for capturing carbon dioxide, a chemical absorption method using an aqueous solution of an amine compound (hereinafter, referred to as an "amine aqueous solution") as an absorbing liquid is known. For example, Patent Document 1 discloses a carbon dioxide capture method in which carbon dioxide is captured by an amine aqueous solution. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-104775 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the carbon dioxide capture method disclosed in Patent Document 1, the amine aqueous solution, which is an absorbent, is difficult to handle. Therefore, a technique is known in which the amine aqueous solution is impregnated into a porous carrier to facilitate handling of the amine. A carbon dioxide capture module having an absorption section constituted by the porous carrier impregnated with the amine aqueous solution captures carbon dioxide in the air by the absorbent when air passes through the absorption section. The amount of carbon dioxide that the carbon dioxide capture module can capture per unit time is proportional to the amount of air passing through the absorption section per unit time.

[0005] The amount of air passing through the absorption section per unit time is proportional to the projected area of ​​the absorption section when viewed in the air flow direction, so the carbon dioxide capture module can increase the amount of carbon dioxide captured per unit time by increasing the projected area of ​​the absorption section.

[0006] When the carbon dioxide capture module is heated, the carbon dioxide captured by the absorbent is desorbed from the absorbent. The carbon dioxide capture module is heated while sealed in a heating chamber of a thermal regeneration device. For this reason, the heating chamber has a volume capable of accommodating the entire carbon dioxide capture module. Therefore, when the volume of the carbon dioxide capture module is increased to increase the projected area of ​​the absorption section, the thermal regeneration device having the heating chamber according to the volume of the carbon dioxide capture module is required. On the other hand, it is desirable to reduce the size of the thermal regeneration device in order to improve ease of installation and ease of handling. Therefore, there is a demand for a carbon dioxide capture module that increases the amount of carbon dioxide captured per unit time without increasing the volume.

[0007] An object of the present invention is to provide a carbon dioxide capture module that increases the amount of carbon dioxide captured per unit time without increasing the volume. [Means for solving the problem]

[0008] The present inventors have studied a carbon dioxide capture module that increases the amount of carbon dioxide captured per unit time without increasing the volume. As a result of extensive studies, the present inventors have come up with the following configuration.

[0009] A carbon dioxide capture module for capturing carbon dioxide includes an absorption section including an absorbent material that absorbs carbon dioxide contained in air, and a filter section that covers the absorbent material and allows air to pass through but prevents the absorption of carbon dioxide through the absorbent material. The absorption section can change its projected area as viewed from the air flow direction by changing its shape.

[0010] The carbon dioxide capture module having the above-mentioned configuration can change the projected area of ​​the absorption section when viewed from the direction in which air flows through the carbon dioxide capture module by modifying the shape. The carbon dioxide capture module can increase the amount of air passing through the absorption section per unit time, for example, by modifying the shape to increase the projected area. At this time, the volume of the carbon dioxide capture module remains the same as before the modification of the shape, since no new absorption section is added to increase the projected area. This makes it possible to increase the amount of carbon dioxide captured per unit time without increasing the volume.

[0011] In addition, the volume of the carbon dioxide capture module is the same as before the shape is changed because no new absorption section is added to increase the projected area. Therefore, even if the shape of the carbon dioxide capture module is changed to, for example, reduce the projected area, the volume does not increase. This eliminates the need to prepare a heating chamber that corresponds to the expansion of the volume of the carbon dioxide capture module, and allows the thermal regeneration device to be made more compact.

[0012] From another viewpoint, it is preferable that the carbon dioxide capture module of the present invention includes the following configuration: The absorption section is configured to be capable of changing its shape between a capture form in which carbon dioxide contained in the air is captured by the absorbent material, and a desorption form in which the carbon dioxide captured by the absorbent material is desorbed from the absorbent material. The projected area in the capture form is larger than the projected area in the desorption state.

[0013] The amount of air passing through the absorption section having the above-mentioned configuration per unit time is greater in the capture mode in which carbon dioxide is captured by the absorbent than in the desorption mode in which carbon dioxide is desorbed from the absorption member, thereby making it possible to increase the amount of carbon dioxide captured per unit time in the capture mode without increasing the volume.

[0014] From another viewpoint, the carbon dioxide capture module of the present invention preferably includes the following configuration: The absorbent is an amine compound capable of absorbing carbon dioxide.

[0015] The amine-based compound absorbent has a large carbon dioxide absorption capacity. Therefore, by using the amine-based compound as the absorbent, the carbon dioxide capture speed can be improved. This makes it possible to increase the amount of carbon dioxide captured per unit time without increasing the volume.

[0016] From another viewpoint, the carbon dioxide capture module of the present invention preferably includes the following configuration: The carbon dioxide capture module is configured to be deformable into any shape.

[0017] In the above configuration, the carbon dioxide capture module can be modified to have any shape and any size of the projected area without increasing the volume. Therefore, the carbon dioxide module can capture carbon dioxide efficiently by the absorption section, the shape of which takes into account the surrounding air flow, etc. This makes it possible to increase the amount of carbon dioxide captured per unit time without increasing the volume.

[0018] From another viewpoint, the carbon dioxide capture module of the present invention preferably includes the following configuration: The carbon dioxide capture module has a plurality of split modules, each including the absorption section and the filter section. One of the plurality of split modules is connected to one of the remaining split modules, and one of the connected adjacent split modules is foldable so that a surface through which air passes in one split module approaches a surface through which air passes in the other absorption section.

[0019] In the above-mentioned configuration, the plurality of split modules can be switched between a state in which the projected area is reduced and a state in which the projected area is increased by transforming into a folded form and an unfolded form, thereby making it possible to increase the amount of carbon dioxide captured per unit time without increasing the volume.

[0020] According to another aspect, the carbon dioxide capture module of the present invention preferably includes the following configuration: The carbon dioxide capture module has a plurality of split modules, each including the absorption section and the filter section. One of the plurality of split modules is connected to one of the remaining split modules, and one of the connected adjacent split modules is movable in a predetermined direction relative to the other split module.

[0021] In the above-mentioned configuration, the plurality of split modules can be switched between a state in which the projected area is reduced and a state in which the projected area is increased by deforming into a state before the split modules are moved in the predetermined direction and a state in which the split modules are moved in the predetermined direction, thereby making it possible to increase the amount of carbon dioxide captured per unit time without increasing the volume.

[0022] From another viewpoint, the carbon dioxide capture module of the present invention preferably includes the following configuration: It has a plurality of split modules, each including the absorption section and the filter section. One of the plurality of split modules has a housing section capable of housing the remaining split modules, and the remaining split modules are housed in the housing section.

[0023] In the above-mentioned configuration, the split module can be switched between a state in which the projected area is reduced and a state in which the projected area is increased by deforming the split module between a state in which the remaining absorption sections are accommodated in a storage section of one of the absorption sections and a state in which the remaining absorption sections are removed from the storage section, thereby making it possible to increase the amount of carbon dioxide captured per unit time without increasing the volume.

[0024] From another point of view, the carbon dioxide capture module of the present invention preferably includes the following configuration: The absorption section is cylindrical, and an absorbent material is located on the circumferential surface.

[0025] As a result, the projected area of ​​the cylindrical absorption section remains constant even if the air flow changes in any radial direction around the axis, making it possible to increase the amount of carbon dioxide captured per unit time without increasing the volume. Effect of the Invention

[0026] According to one embodiment of the present invention, it is possible to provide a carbon dioxide capture module that can increase the amount of carbon dioxide captured per unit time without increasing the volume. [Brief description of the drawings]

[0027] [Figure 1] FIG. 1 is a schematic perspective view showing a desorption mode of the carbon dioxide capture module according to the first embodiment of the present invention. [Diagram 2] FIG. 2 is an axial cross-sectional view of the desorption configuration of the carbon dioxide capture module according to the first embodiment of the present invention. [Diagram 3] FIG. 3 is a diagram showing a schematic diagram of the capture form of the carbon dioxide capture module according to the first embodiment of the present invention. [Figure 4] FIG. 4 is a diagram showing the projected area of ​​the desorption form and the projected area of ​​the capture form of the carbon dioxide capture module according to the first embodiment of the present invention. [Diagram 5] FIG. 5 is an exploded perspective view of the absorption section and the filter section of the carbon dioxide capture module according to the first embodiment of the present invention. [Figure 6] FIG. 6 is a schematic diagram illustrating the operation of the absorption section and the filter section of the carbon dioxide capture module according to the first embodiment of the invention. [Figure 7] FIG. 7 is a schematic perspective view showing a carbon dioxide capture module according to the second embodiment of the present invention. [Figure 8]FIG. 8 is a top perspective view in the axial direction of a carbon dioxide capture module according to a second embodiment of the present invention. [Figure 9] FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. [Figure 10] FIG. 10 is an exploded perspective view of an absorbing section and a filtering section according to the second embodiment of the present invention. [Figure 11] FIG. 11 is a perspective view that illustrates a capture form of the carbon dioxide capture module according to the second embodiment of the present invention. [Figure 12] FIG. 12 is an axial cross-sectional view that typically illustrates the capture form of the carbon dioxide capture module according to the second embodiment of the present invention. [Figure 13] FIG. 13 is a schematic diagram illustrating a state in which air is circulated by a blower through the carbon dioxide capture module according to the second embodiment of the invention. [Figure 14] FIG. 14 is a diagram showing a state in which a carbon dioxide capture module according to a modified example of the second embodiment of the invention is separated into a plurality of separate module parts. [Figure 15] FIG. 15 is a cross-sectional view of a carbon dioxide capture module according to another embodiment of the present invention. [Figure 16] FIG. 16 is a schematic perspective view showing a desorption form and a capture form of a carbon dioxide capture module according to another embodiment of the present invention. [Figure 17] FIG. 17 is a vertical cross-sectional view of a carbon dioxide capture module according to another embodiment of the present invention. [Figure 18] FIG. 18 is a longitudinal cross-sectional view of a portion of a carbon dioxide capture module according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Each embodiment will be described below with reference to the drawings. In each drawing, the same parts are given the same reference numerals, and the description of the same parts will not be repeated. Note that the dimensions of the components in each drawing do not faithfully represent the actual dimensions of the components and the dimensional ratios of each component.

[0029] In the following description, the expression "connected" includes not only the case where members are directly fixed to each other, but also the case where they are fixed to each other via another member. That is, in the following description, the expression "fixed" includes the meaning of direct and indirect fixation between members.

[0030] [Embodiment 1] 1 to 6, a schematic configuration of a carbon dioxide capture module 1, which is a first embodiment of the carbon dioxide capture module of the present invention, will be described. The carbon dioxide capture module 1 is a module that is placed in a living space such as the room of an ordinary home, for example, to capture a small amount of carbon dioxide contained in the surrounding air.

[0031] (Overall composition) The overall configuration of the carbon dioxide capture module 1 will be described with reference to Figs. 1 to 3. Fig. 1 is a schematic perspective view showing a desorption form of the carbon dioxide capture module 1 according to the first embodiment of the present invention. Fig. 2 is an axial cross-sectional view of the desorption form of the carbon dioxide capture module. Fig. 3 is a diagram showing a capture form of the carbon dioxide capture module. Fig. 4 is a diagram showing a projected area A1 of the desorption form and a projected area A2 of the capture form of the carbon dioxide capture module 1. In Fig. 1, a dot pattern is applied to the absorption section 2 for the sake of explanation. In Figs. 1 and 3, the sealing section 4 shown in Fig. 2 is omitted for the sake of convenience.

[0032] 1, the carbon dioxide capture module 1 has a substantially cylindrical outer shape. The carbon dioxide capture module 1 has an absorption section 2, a filter section 3, and a sealing section 4.

[0033] The absorption section 2 is composed of a rectangular sheet-like member that is long in one direction. The absorption section 2 has an absorbent 21 that absorbs carbon dioxide contained in the air.

[0034] The filter portion 3 allows air to pass through but prevents air from passing through the absorbent material 21. In this embodiment, the filter portion 3 includes a first filter portion 31 and a second filter portion 32.

[0035] The first filter section 31 is composed of a rectangular sheet-like member that is long in one direction. The first filter section 31 is arranged in close contact with one surface in the thickness direction of the absorbent section 2 so as to cover the entirety of said one surface. The second filter section 32 has a similar configuration to the first filter section 31. The second filter section 32 is arranged in close contact with the other surface in the thickness direction of the absorbent section 2 so as to cover the entirety of the other surface in the thickness direction.

[0036] The first filter section 31 and the second filter section 32 are wound into a roll together with the absorbing section 2, with the absorbing section 2 sandwiched in the thickness direction. That is, the carbon dioxide capture module 1 of this embodiment has a substantially cylindrical outer shape.

[0037] The sealing part 4 seals the absorbing part 2 with the first filter part 31 and the second filter part 32. The sealing part 4 is made of, for example, a resin film. The sealing part 4 is bonded to both ends of the first filter part 31 and the second filter part 32 in the axial direction. That is, the sealing part 4 seals the gap between the first filter part 31 and the second filter part 32. The absorbing part 2 is covered by the first filter part 31, the second filter part 32, and the sealing part 4. Therefore, the first filter part 31, the second filter part 32, and the sealing part 4 prevent the absorbing material 21 from leaking to the outside. Note that the resin film may be made of any material that can be bonded to the first filter part 31 and the second filter part 32 and prevent the absorbing material 21 from leaking. In addition, the sealing portion 4 may be configured to join both axial ends of the first filter portion 31 and the second filter portion 32, and both axial ends of the first filter portion 31 and the second filter portion 32 in a direction perpendicular to the axial direction.

[0038] A part of the first filter section 31 is located on the outer peripheral surface of the carbon dioxide capture module 1. That is, as shown in Fig. 1 and Fig. 2, with the absorption section 2, the first filter section 31 and the second filter section 32 wound in a roll shape, only a part of the first filter section 31 is exposed to the outside. That is, in the carbon dioxide capture module 1 in this state, only a part of the filter section 3 is in contact with the surrounding air on the outside of the carbon dioxide capture module 1. The rest of the filter section 3 of the carbon dioxide capture module 1 in this state is not in contact with the surrounding air on the outside of the carbon dioxide capture module 1.

[0039] As shown in Fig. 3, the absorption section 2 and the filter section 3 can be transformed from a rolled-up form to a form in which one end in the longitudinal direction located on the radially outer side is pulled out in one direction. Note that in Fig. 3, the carbon dioxide capture module 1 has a form in which the absorption section 2 and the filter section 3 are partially wound into a roll, but the entire rolled-up portion may be transformed into a form in which it is pulled out in one direction. In other words, the carbon dioxide capture module 1 may be configured so that it can be transformed into any shape.

[0040] In the following, the form in which the absorption section 2 and the two filter sections 3 are wound into a roll shape is referred to as the detachment form of the carbon dioxide capture module 1, and the form in which the absorption section 2 and the two filter sections 3 are pulled out in one direction from the roll-shaped portion is referred to as the capture form of the carbon dioxide capture module 1.

[0041] The capture form means the form in which the absorbent 21 of the carbon dioxide capture module 1 captures carbon dioxide in the air. The desorption form means the form in which the carbon dioxide captured by the absorbent 21 of the carbon dioxide capture module 1 is desorbed from the absorbent in the heating chamber of the thermal regeneration device.

[0042] In the carbon dioxide capture module 1 in the desorption form, the filter section 3 located on the outer circumferential surface of the roll-shaped portion comes into contact with the air surrounding the outside of the carbon dioxide capture module 1. On the other hand, in the carbon dioxide capture module 1 in the capture form, the air surrounding the carbon dioxide capture module 1 comes into contact with the filter section 3 located on the outer circumferential surface of the roll-shaped portion and with the filter section 3 pulled out from the roll-shaped portion. That is, by transforming the carbon dioxide capture module 1 into the capture form, it is possible to increase the area of ​​contact between the filter section 3 and the air surrounding the outside of the carbon dioxide capture module 1. In the present invention, a mechanism that realizes the function of increasing the area of ​​contact between the filter section 3 and the air surrounding the outside of the carbon dioxide capture module 1 is referred to as a deformation mechanism.

[0043] 4, in the carbon dioxide capture module 1 in desorption form, if the direction perpendicular to the axis of the roll-shaped portion is the air flow direction, then the projected area A1 (hatched portion) of the absorption section 2 when the carbon dioxide capture module 1 in desorption form is viewed in the air flow direction is the area through which air flowing toward the carbon dioxide capture module 1 in desorption form can pass. In other words, the projected area A1 of the carbon dioxide capture module 1 in desorption form indirectly indicates the amount of air from which carbon dioxide is captured per unit time by the carbon dioxide capture module 1 in desorption form.

[0044] In the carbon dioxide capture module 1 in capture form, if the direction perpendicular to the plane in the thickness direction of the absorption section 2 is the air flow direction, the projected area A2 (hatched portion) of the absorption section 2 when the carbon dioxide capture module 1 in capture form is viewed in the air flow direction is an area through which air flowing toward the carbon dioxide capture module 1 in capture form can pass. In other words, the projected area A2 of the carbon dioxide capture module 1 in capture form indirectly indicates the amount of air from which carbon dioxide is captured per unit time by the carbon dioxide capture module 1 in capture form.

[0045] The projected area A2 of the carbon dioxide capture module 1 in the capture form is larger than the projected area A1 of the carbon dioxide capture module 1 in the desorption form. In other words, the projected area of ​​the carbon dioxide capture module 1 changes from the projected area A1 to the projected area A2 due to the transformation from the desorption form to the capture form. At this time, the volume of the carbon dioxide capture module 1 does not change.

[0046] In the carbon dioxide capture module 1 having the above-mentioned configuration, the projected area of ​​the absorption section 2 as viewed from the air flow direction can be changed by modifying the shapes of the absorption section 2 and the filter section 3. In the carbon dioxide capture module 1 in the desorption form, the amount of air passing through the absorption section 2 per unit time can be increased by modifying the shapes of the absorption section 2 and the filter section 3 so as to increase the projected area from A1 to A2. At this time, the volume of the carbon dioxide capture module 1 in the capture form is the same as before the modification of the shape, since no new absorption section 2 is added to increase the projected area A1 of the carbon dioxide capture module 1 in the desorption state. This makes it possible to increase the amount of carbon dioxide captured per unit time without increasing the volume.

[0047] In addition, the volume of the carbon dioxide capture module 1 remains the same as before the change, because no new absorption section has been added to increase the amount of absorbent 21 per unit volume. Therefore, the carbon dioxide capture module 1 in the desorption form can efficiently desorb the carbon dioxide captured by the absorbent 21.

[0048] (Detailed configuration of the absorption section and the filter section) Next, the configurations of the absorption section 2 and the filter section 3 will be described in detail with reference to Fig. 5 and Fig. 6. Fig. 5 is an exploded perspective view of the absorption section 2 and the filter section 3 of the carbon dioxide capture module 1. Fig. 6 is a schematic diagram illustrating the operation of the absorption section 2 and the filter section 3 of the carbon dioxide capture module 1.

[0049] The absorbing section 2 has an absorbent 21 that absorbs carbon dioxide, and a base material 22 impregnated with the absorbent 21. The absorbing section 2 is, for example, obtained by impregnating the base material 22 with the liquid absorbent 21. The absorbent 21 is, for example, an amine-based absorbent that absorbs carbon dioxide. The base material 22 is, for example, a sheet-like sponge made of polyurethane, melamine resin, or the like. The sheet-like sponge may be, for example, an activated carbon filter having activated carbon attached thereto.

[0050] Examples of amine-based absorbents that absorb carbon dioxide include monoethanolamine, diethanolamine, triethanolamine, 2-amino-2-methyl-1-propanol, 2-isopropylaminoethanol, 2-(methylamino)ethanol, 2-(ethylamino)ethanol, N-methyldiethanolamine, ethylenediamine, hexamethylenediamine, diethylenetriamine, piperazine, o-xylylenediamine, m-xylylenediamine, and p-xylylenediamine, and mixtures thereof. These amines may also be mixed with a liquid such as ethylene glycol that has a high boiling point and a molecular diameter of 4 Å or more that does not pass through the filter unit 3. When using the amine-based absorbent as a mixture, it is preferable that the concentration of the liquid amine-based absorbent is 30% or more.

[0051] Furthermore, as the amine-based absorbent, a polymeric amine having a number average molecular weight of 500 or more, or a polymer of an amine monomer and a dicarboxylic acid monomer, the number average molecular weight of which is 500 or more, may be used.

[0052] These high molecular weight amines and polymers having a number average molecular weight of 500 or more are liquid or solid, have almost no volatility, and even if they volatilize, the amount is extremely small, so that they have no effect on the human body.

[0053] Such high molecular weight amines do not volatilize like ethanolamine, which is a low molecular weight amine, so there is no need to block the permeation of the volatilized amine absorbent in the filter section 3. For this reason, the filter section 3 may have a lower performance in blocking gas permeation compared to a filter that can block the permeation of the volatilized amine absorbent, but instead allows air to pass through more easily.

[0054] As the polymeric amine, for example, polyethyleneimine is preferable, and the number average molecular weight is preferably from 10,000 to 100,000. The polyethyleneimine may be a branched polyethyleneimine which is a liquid, or a linear polyethyleneimine which is a solid.

[0055] If the number average molecular weight of the liquid polyethyleneimine exceeds 100,000, the viscosity becomes too high and handling becomes difficult. However, by setting the upper limit of the number average molecular weight of the polyethyleneimine to 100,000, it is possible to prevent the handling from becoming difficult.

[0056] The liquid absorbent 21 is, for example, monoethanolamine. The absorbent 21 may be an amine-based compound capable of absorbing carbon dioxide. The amine-based compound is preferably one that can be used without problems near room temperature. In this embodiment, the amine-based compound absorbent 21 used is one that absorbs a large amount of carbon dioxide at room temperature. By using such a type of amine-based compound, the carbon dioxide capture speed at room temperature can be improved.

[0057] The filter section 3 is made of a material that is permeable to air but not permeable to the absorbent material 21. As a constituent material of the filter section 3, for example, a film-like or sheet-like porous resin such as a polyolefin-based porous film or a PTFE (polytetrafluoroethylene) porous film can be used.

[0058] The filter section 3 may have a filter body made of a film-like or sheet-like porous resin, and a support for supporting the filter body. In this case, the support is preferably disposed in close contact with the surface opposite to the surface on which the absorbing section 2 is disposed, among both surfaces in the thickness direction of the filter body. The support may be deformable into a roll shape and may be made of a material that is permeable to air.

[0059] The operation of the absorption unit 2 and the filter unit 3 when the absorption unit 2 is sandwiched between a pair of filter units 3 will be described with reference to Fig. 6. Air containing nitrogen (N2), oxygen (O2), carbon dioxide (CO2), etc. flows toward one of the filter units 3 along with the wind flow indicated by the imaginary arrows. The air passes through one of the filter units 3 and reaches the absorption unit 2. Carbon dioxide (CO2) contained in the air that reaches the absorption unit 2 is absorbed by the absorbent material 21 impregnated in the base material 22. Air containing nitrogen (N2), oxygen (O2), etc. other than carbon dioxide (CO2) passes through the other filter unit 3 without being absorbed by the absorbent material 21.

[0060] In this way, a small amount of carbon dioxide (CO2) contained in the air that has passed through the filter section 3 is absorbed and collected by the absorbent material 21 of the absorption section 2.

[0061] The filter section 3 prevents permeation of amines constituting the liquid amine-based absorbent impregnated in the absorption section 2. Thus, the amines are trapped in the absorption section 2 by the two filter sections 3 sandwiching the absorption section 2. Therefore, the harmful amine-based absorbent in the absorption section 2 does not leak out of the carbon dioxide capture module 1.

[0062] A used carbon dioxide capture module 1 in which carbon dioxide has been absorbed in the absorbent 21 can be reused, for example, as follows. That is, after a predetermined period of time has passed, the used carbon dioxide capture modules 1 are collected at a factory or the like equipped with a regeneration furnace. A large number of used carbon dioxide capture modules 1 collected at the factory or the like are heated in the regeneration furnace, for example, to about 120°C, causing the absorbent 21 in the absorption section 2 to release carbon dioxide.

[0063] The carbon dioxide released from this carbon dioxide capture module 1 can be captured and used for other purposes, such as artificial photosynthesis, which synthesizes chemicals using solar energy.

[0064] The carbon dioxide capture module 1 that has been regenerated by releasing carbon dioxide from the absorbent 21 is delivered to each home again. In this way, the carbon dioxide capture module 1 can be used for a long period of time by repeating the cycle of capturing, recovering, and regenerating carbon dioxide.

[0065] (Structure of the deformation mechanism) The carbon dioxide capture module 1 may have a deformation mechanism that increases the contact area between the filter section 3 and the surrounding air outside the carbon dioxide capture module 1. The deformation mechanism is a mechanism that can unfold the roll-shaped absorption section 2 and two filter sections 3. The deformation mechanism is, for example, a mechanism that uses an electric motor to feed and unfeed the roll-shaped absorption section 2 and filter section 3. The deformation mechanism can increase the amount of carbon dioxide captured per unit time by transforming the carbon dioxide capture module 1 from the desorption form to the capture form.

[0066] As described above, the exemplary carbon dioxide capture module 1 according to this embodiment has an absorption section 2 having an absorbent 21 that absorbs carbon dioxide contained in the air, and a filter section 3 that is located between the absorption section 2 and the air surrounding the carbon dioxide capture module 1, and that allows air to pass through but prevents the absorbent 21 from passing through.

[0067] The carbon dioxide capture module 1 can increase the amount of air passing through the absorption section 2 per unit time by modifying the shape of the absorption section 2 so as to increase the projected area of ​​the absorption section 2 when viewed in the air flow direction. This can increase the amount of carbon dioxide captured per unit time in the absorption section 2.

[0068] [Embodiment 2] Next, a carbon dioxide capture module 101 which is a second embodiment of the carbon dioxide capture module of the present invention will be described with reference to Figs. 7 to 13. In the following, the same components as those in the first embodiment are given the same reference numerals, their description will be omitted, and components different from those in the first embodiment will be described. Fig. 7 is a schematic perspective view showing the carbon dioxide capture module 101. Fig. 8 is a top see-through view of the carbon dioxide capture module 101 as viewed from the axial direction. Fig. 9 is a cross-sectional view taken along the line IX-IX in Fig. 8. Fig. 10 is an exploded perspective view of the absorption section 2 and the filter section 3. Fig. 11 is a perspective view showing a typical capture form of the carbon dioxide capture module 101. Fig. 12 is a cross-sectional view in the axial direction showing a typical capture form of the carbon dioxide capture module 101.

[0069] As shown in Fig. 7, the carbon dioxide trapping module 101 is configured in a cylindrical shape. The carbon dioxide trapping module 101 has a plurality of separate module parts 111. Each of the plurality of separate module parts 111 is configured in a cylindrical or columnar shape. The plurality of separate module parts 111 are concentrically arranged in the carbon dioxide trapping module 101 in the desorption form. The inside of the cylindrical separate module part 111 is configured as a storage part.

[0070] 8 and 9, the divided module part 111a, which has the largest diameter among the multiple divided module parts 111, contains divided module part 111b, which has the second largest diameter after divided module part 111a. The divided module part 111b contains divided module part 111c, which has a smaller diameter than divided module part 111b. The outer peripheral surface of the carbon dioxide capture module 101 is formed by the outer peripheral surface of divided module part 111a.

[0071] The multiple division module units 111 have the same structure. Therefore, in the following, the configuration of one division module unit 111 will be described, and the description of the configurations of the other division module units will be omitted.

[0072] The divided module section 111 has a divided absorbent section 102, a first divided filter section 131, a second divided filter section 132, and a sealing section 104. The divided absorbent section 102 is formed by a sheet-like base material including an absorbent material 21 (see FIG. 6) in a cylindrical shape. The divided absorbent section 102 is included in the absorbent section 2.

[0073] The first divided filter section 131 is configured in a cylindrical shape. The first divided filter section 131 is arranged in close contact with the outer peripheral surface of the divided absorption section 102 so as to cover the entire outer peripheral surface of the divided absorption section 102. The second divided filter section 132 has a similar configuration to the first divided filter section 131. The second divided filter section 132 is arranged in close contact with the inner peripheral surface of the divided absorption section 102 so as to cover the entire inner peripheral surface of the divided absorption section 102. The first divided filter section 131 and the second divided filter section 132 are included in the filter section 103.

[0074] In the carbon dioxide trapping module 101 in the desorption mode, the first separated filter section 131 of the separated module section 111 a having the largest diameter is in contact with the surrounding air outside the carbon dioxide trapping module 101 .

[0075] 7 and 9, the sealing portion 104 covers the peripheral ends in the axial direction of the divided absorbent portion 102 and the first and second divided filter portions 131 and 132 that are in close contact with both side surfaces of the divided absorbent portion 102. In this embodiment, the sealing portions 104 of the divided module portions 111a, 111b, and 111c are formed in an annular shape.

[0076] The sealing portion 104 blocks the divided absorption portion 102 from contacting the surrounding air other than the air passing through the first divided filter portion 131 and the second divided filter portion 132. In other words, the divided absorption portion 102, including its peripheral end portion, is not exposed to the outside. This prevents the amine-based absorbent material of the divided absorption portion 102 from leaking out to the outside through the first divided filter portion 131 and the second divided filter portion 132.

[0077] Next, the specific configuration of the absorption section 2 and the filter section 103 will be described with reference to Fig. 10. As shown in Fig. 10, the filter section 103 has an LTA zeolite membrane 103b formed on one surface of a plate-shaped porous substrate 103a. The LTA zeolite membrane 103b of the filter section 103 is a porous membrane having fine pores (micropores) resulting from a crystal structure. The LTA zeolite membrane 103b allows the passage of molecules smaller than the diameter of the pores by a molecular sieve action, while preventing the passage of molecules larger than the diameter of the pores.

[0078] The LTA zeolite membrane 103b of this embodiment is made of Na-LTA zeolite that contains Na ions in the framework. The pore diameter of this zeolite is larger than the molecular diameter of air and smaller than that of amine. Therefore, the amine constituting the amine-based absorbent does not permeate.

[0079] The LTA zeolite membrane 103b is preferably an Na-LTA zeolite when the amine absorbent of the absorbing section 2 is a linear amine having a relatively small molecular diameter, such as monoethanolamine, etc. When the amine absorbent is a branched amine having a relatively large molecular diameter, such as 2-amino-2-methyl-1-propanol or xylenediamine having a phenyl group, etc., a Ca-LTA zeolite may be used.

[0080] As the porous substrate 103a on one of the main surfaces of which the LTA zeolite membrane 103b is formed, for example, a ceramic substrate such as an alumina substrate made of aluminum oxide, a porous resin substrate, or the like can be used.

[0081] By forming a film of zeolite on the porous substrate 103a, the LTA zeolite membrane 103b can be stably maintained.

[0082] The filter section 103 is opposed to the absorbing section 2 such that the LTA zeolite membrane 103b formed on one surface in the thickness direction faces the absorbing section 2.

[0083] In this manner, in the filter section 103, the LTA zeolite membrane 103b faces the inner absorption section 2, and the porous substrate 103a faces the outside where it can come into contact with the surrounding air outside the carbon dioxide capture module 101. This allows the inner LTA zeolite membrane 103b to be protected by the outer porous substrate 103a, and damage to the inner LTA zeolite membrane 103b can be prevented.

[0084] The sealing portion 104 is preferably made of a corrosion-resistant material, in particular an alkali-resistant resin material such as polyethylene, polypropylene, nylon, polytetrafluoroethylene, ethylene tetrafluoroethylene, phenol resin, or epoxy resin.

[0085] Furthermore, the sealing portion 104 may be made of a metal material, for example, a corrosion-resistant metal material such as stainless steel. As the metal material, iron, copper, titanium, chromium, or nickel may be used in addition to stainless steel depending on the type of amine-based absorbent. When a metal material that may be corroded by the amine-based absorbent is used as the base material, a corrosion-resistant material, for example, a metal such as titanium, chromium, or nickel, or a resin such as polytetrafluoroethylene (PTFE) may be used as a coating to cover the surface of the base material.

[0086] Next, the multiple separate module parts 111a, 111b, and 111c that constitute the carbon dioxide trapping module 101 will be described with reference to FIGS.

[0087] As shown in Figures 11 and 12, of the split module parts 111a and 111b adjacent in the radial direction, one split module part 111a is connected to the other split module part 111b. The split module part 111b moves relative to the split module part 111a in the axial direction, which is a predetermined direction. Similarly, the split module part 111c moves relative to the split module part 111b in the axial direction, which is a predetermined direction. In other words, the carbon dioxide capture module 101 is expandable and contractable in the axial direction.

[0088] Moreover, of the split module parts 111a and 111b adjacent in the radial direction, one axial end of the split module part 111b located radially inward of the split module part 111a is configured not to come off from one axial end of the split module part 111a. Similarly, one axial end of the split module part 111c located radially inward of the split module part 111b is configured not to come off from one axial end of the split module part 111c. In other words, the split module parts 111 adjacent in the radial direction are connected to each other so as not to be separated.

[0089] In the following, the state in which one of the multiple split module sections 111 accommodates another split module in the accommodation section thereof and is arranged concentrically is referred to as the desorption form of the carbon dioxide capture module 101, and the state in which the multiple split module sections 111 are moved axially is referred to as the capture form of the carbon dioxide capture module 101.

[0090] In the carbon dioxide trapping module 101 in the desorption form, only the first divided filter section 131 on the outer circumferential side of the divided module section 111a having the largest diameter among the multiple divided module sections 111 comes into contact with the surrounding air outside the carbon dioxide trapping module 101. On the other hand, in the carbon dioxide trapping module 101 in the trapping form, the first divided filter section 131 of each of the multiple divided module sections 111a, 111b, and 111c can come into contact with the surrounding air outside the carbon dioxide trapping module 101. That is, by changing the form of the carbon dioxide trapping module 101 to the trapping form, the contact area between the first divided filter section 131 and the surrounding air can be increased. The carbon dioxide trapping module 101 has a deformation mechanism that increases the area of ​​the first divided filter section 131 that comes into contact with the surrounding air outside the carbon dioxide trapping module 101.

[0091] In addition, in the carbon dioxide capture module 101, when the radial direction of the split module section 111 is the air flow direction (see the arrows in Figs. 11 and 12), the projected area of ​​the multiple split absorption sections 102 when viewed in the air flow direction can be changed. The projected area of ​​the multiple split absorption sections 102 in the carbon dioxide capture module 101 in the capture form is the sum of the projected areas of the split absorption sections 102 possessed by each of the split module sections 111a, 111b, and 111c. The projected area of ​​the multiple split absorption sections 102 in the carbon dioxide capture module 101 in the desorption form is the projected area of ​​the split absorption section 102 possessed by the split module section 111a. Therefore, the projected area of ​​the split absorption section 102 in the carbon dioxide capture module 101 in the capture form is larger than the projected area of ​​the split absorption section 102 in the carbon dioxide capture module 101 in the desorption form.

[0092] With the above-mentioned configuration, the carbon dioxide capture module 101 can increase the amount of carbon dioxide captured per unit time without increasing the volume by transforming from the desorption form to the capture form.

[0093] Furthermore, the carbon dioxide capture module 101 having a plurality of cylindrical divided module parts 111a, 111b, and 111c may have a mechanism for forcibly circulating air using, for example, a blower.

[0094] [Modification of the second embodiment] A modified example of the carbon dioxide trapping module 101 will be described with reference to Fig. 13 and Fig. 14. Fig. 13 is a schematic diagram for explaining how air is circulated through the carbon dioxide trapping module 101 by a blower 108. Fig. 14 is a diagram showing a state in which the carbon dioxide trapping module 201 101 is separated into a plurality of separate module parts 111a, 111b, and 111c.

[0095] As shown in Fig. 13, the carbon dioxide capture module 101 in the capture form has a substantially triangular pyramid-shaped space having a circular opening 112 formed by a plurality of separate module parts 111a, 111b, and 111c. The carbon dioxide capture module 101 may have a blower 108 that blows air toward the opening 112. The carbon dioxide capture module 101 in the capture form forcibly blows air into all of the separate module parts 111a, 111b, and 111c by the blower 108. This makes it possible to increase the amount of air passing through the absorption section 102 within a given time. Therefore, it is possible to increase the amount of carbon dioxide captured per unit time without increasing the volume.

[0096] Moreover, like a carbon dioxide capture module 201 shown in FIG. 14, the separated module sections 111 adjacent to each other in the radial direction may be configured to be separable from each other.

[0097] In the carbon dioxide capture module 201, the split module part 111b located radially inward of the split module part 111a among the split module parts 111a and 111b adjacent to each other in the radial direction is configured to be removable from the split module part 111a. That is, the split module part 111a and the split module part 111b are separable. Similarly, the split module part 111b and the split module part 111c adjacent to each other in the radial direction are separable.

[0098] As a result, the carbon dioxide capture module 201 in the desorption form can be transformed into the carbon dioxide capture module 201 in the capture form by separating the multiple separate module parts 111a, 111b, and 111c from one another. The multiple separate module parts 111a, 111b, and 111c can be arranged in any positions spaced apart from one another. As a result, the carbon dioxide capture module 201 can increase the amount of carbon dioxide captured per unit time without increasing its volume.

[0099] [Other embodiments] 15 has a plurality of plate-shaped split modules 311 including a split absorption section 302, a first split filter section 331, and a second split filter 332. One of the plurality of split modules 311 is connected to one of the remaining split modules 311. In addition, adjacent connected split modules 311 are configured to be foldable so that a surface through which air passes in one split module 311 approaches a surface through which air passes in the other split module 311. That is, the plurality of split modules 311 are configured to be foldable in an accordion-like shape.

[0100] The carbon dioxide capture module 301 can be transformed into a detachment form in which the multiple split modules 311 are folded and into a capture form in which the multiple split modules 311 are extended. In the carbon dioxide capture module 301 in the capture form, when the direction perpendicular to the direction in which the multiple split modules 311 extend is defined as the air flow direction (arrow X), the projected area as seen in the air flow direction is larger than the projected area as seen in the air flow direction in the case where the direction perpendicular to the surface of the split module 311 through which air passes is defined as the air flow direction (arrow Y) in the carbon dioxide capture module 301 in the desorption form.

[0101] As a result, the carbon dioxide trapping module 301 increases the area of ​​the first divided filter section 311 and the second divided filter section 312 that come into contact with the surrounding air outside the carbon dioxide trapping module 301 by transforming from the desorption form to the capture form. That is, the carbon dioxide trapping module 301 in the desorption form can increase its projected area by transforming into the carbon dioxide trapping module 301 in the capture form. This allows the carbon dioxide trapping module 301 to increase the amount of carbon dioxide trapped per unit time without increasing its volume.

[0102] In the carbon dioxide capture module 301, the divided absorption section 302, the first divided filter section 311, and the second divided filter section 312 are folded in an accordion shape. However, the absorption section and the filter section may be folded in four or in a roll shape, for example.

[0103] 16 and 17, the carbon dioxide capture module 401 has a plurality of rectangular column-shaped split module parts 411a and 411b. The split module part 411a is larger than the split module 411b. The split module 411b is located inside the split module 411a.

[0104] The split module part 411b is connected to the split module part 411a. The split module part 411b moves relative to the split module part 411a in the axial direction, which is a predetermined direction. That is, the carbon dioxide capture module 401 of this embodiment is expandable and contractable in the axial direction. The carbon dioxide capture module 401 is configured to be capable of changing its shape between a capture shape extended in the axial direction and a detached state shortened in the axial direction.

[0105] In addition, one axial end of the split module part 411b located inside the split module 411a is configured not to come out of one axial end of the split module part 411a. That is, the split module part 411a and the split module 411b are connected so as not to be separated.

[0106] The split modules 411a and 411b have a plurality of split absorption sections 402 and a plurality of split filter sections 403. The split filter sections 403 are arranged on the outer side surfaces along the axial direction of the split module 411a. One outer side surface perpendicular to the axial direction of the split module 411a is sealed by a sealing section 104. Thus, the split module 411a has an internal space surrounded by the sealing section 104 and the plurality of split filter sections 403.

[0107] A plurality of plate-shaped divided absorption sections 402 are arranged in the internal space of the split modules 411a and 411b. The divided absorption sections 402 are arranged in a line at intervals along the axial direction. Furthermore, the divided absorption sections 402 of the split module 411b are arranged between the divided absorption sections 402 of the split module 411a. Furthermore, the divided filter sections 403 of the split module 411b are arranged between the divided filter sections 403 of the split module 411a. The divided absorption sections 402 and the divided filter sections 403 of the split module 411b are configured to be movable in the axial direction relative to the divided absorption section 402 of the split module 441a.

[0108] In the carbon dioxide trapping module 401 in the trapping form, the split module 411b moves in the axial direction relative to the split module 411a. That is, in the carbon dioxide trapping module 401 in the trapping form, the split absorption section 402 and the split filter section 403 of the split module 411b are located outside the split module 411a.

[0109] In the carbon dioxide capture module 401 in the capture form, when the direction perpendicular to the extension direction of the split module 411b is the air flow direction, the projected area as viewed in the air flow direction is larger than the projected area in the carbon dioxide capture module 401 in the desorption form.

[0110] In the second embodiment, the separate module section 111c of the carbon dioxide trapping module 101 is configured to have a hollow cylindrical shape. However, as shown in Fig. 18, the separate module section 511c of the carbon dioxide trapping module 501 may have a configuration in which a separate filter section 503 is disposed on the outer periphery side of a cylindrical absorption section 502. In the first embodiment, the second filter section 32 and the first filter section 31 arranged in the radial direction are in close contact with each other in the carbon dioxide capture module 1 wound in a roll shape. However, there may be a gap between the second filter section and the first filter section.

[0111] In the first embodiment, the absorbent section 2 and the filter section 3 are wound in a roll shape. However, the absorbent section and the filter section may be, for example, folded.

[0112] Although the embodiment of the present invention has been described above, the above-mentioned embodiment is merely an example for carrying out the present invention. Therefore, the present invention is not limited to the above-mentioned embodiment, and it is possible to carry out the above-mentioned embodiment by appropriately modifying it within the scope of the gist of the present invention. [Explanation of symbols]

[0113] 1, 101, 201, 301, 401, 501 Carbon dioxide capture module 2, 302, 502 Absorption section 21 Absorbent material 22 Base material 3, 103 Filter section 31, 331 First filter section 32, 332 Second filter section 111, 111a, 111b, 111c, 411a, 411b Split module 102, 302, 402, 502 Split absorption section 103a Porous substrate 103b LTA type zeolite membrane 112 Aperture 131 First division filter section 132 Second division filter section 4, 104 Sealing part 108 Blower 403, 503 split filter section A1, A2 projected area X, Y Air flow direction

Claims

1. A carbon dioxide capture module that captures carbon dioxide, An absorption section including an absorbent material that absorbs carbon dioxide contained in the air; a filter portion that covers the absorbent material and allows air to pass through but prevents air from passing through the absorbent material; The absorbing portion is The projected area of ​​the absorption section when viewed in the air flow direction can be changed by changing the shape. Carbon dioxide capture module.

2. 2. The carbon dioxide capture module of claim 1, The absorbing portion is The absorbent is configured to be capable of changing its shape between a capture shape in which carbon dioxide contained in the air is captured by the absorbent and a desorption shape in which the carbon dioxide captured by the absorbent is desorbed from the absorbent, The projected area in the collection form is: is larger than the projected area in the detached form; Carbon dioxide capture module.

3. The carbon dioxide capture module according to claim 1 or 2, The absorbent is an amine-based compound capable of absorbing carbon dioxide. Carbon dioxide capture module.

4. 2. The carbon dioxide capture module of claim 1, Configured to be deformable into any shape; Carbon dioxide capture module.

5. 2. The carbon dioxide capture module of claim 1, a plurality of division modules each including the absorption section and the filter section; One of the plurality of split modules is connected to one of the remaining split modules, and the split modules are foldable so that a surface through which air passes of one of the adjacent split modules connected to each other is brought close to a surface through which air passes of the other split module. Carbon dioxide capture module.

6. 2. The carbon dioxide capture module of claim 1, a plurality of division modules each including the absorption section and the filter section; One of the plurality of split modules is connected to one of the remaining split modules, and one of the adjacent split modules connected to each other is movable in a predetermined direction relative to the other split module. Carbon dioxide capture module.

7. 2. The carbon dioxide capture module of claim 1, a plurality of division modules each including the absorption section and the filter section; One of the plurality of division modules has a housing portion capable of housing the remaining division modules, and the remaining division modules are housed in the housing portion. Carbon dioxide capture module.

8. The carbon dioxide capture module according to claim 1 or 2, The absorbing portion is It is cylindrical and has an absorbent material located on its circumferential surface. Carbon dioxide capture module.

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