Adsorption unit and carbon dioxide recovery system

Abstract

An adsorption unit (U) comprises a plurality of modules (M) which are constituted by separate members and are connected to each other. The plurality of modules (M) include: an inflow side module (M2) that includes an inflow port (I) through which air flows into an accommodation chamber (S) and an inflow side opening / closing mechanism (41) which opens and closes the inflow port (I); an adsorption module (M1) that is provided with an adsorption member (12); and an outflow side module (M3) that includes an outflow port (O) through which air in the accommodation chamber (S) flows out and an outflow side opening / closing mechanism (43) which opens and closes the outflow port (O).

Description

Adsorption units and carbon dioxide capture systems

[0001] The present disclosure relates to adsorption units and carbon dioxide capture systems.

[0002] There is a system that captures carbon dioxide from the air. In the carbon dioxide capture system described in Patent Document 1, an adsorption member 4 is placed inside a storage unit. An upstream opening and a downstream opening of the storage unit are provided with a sliding door, which serves as an opening and closing mechanism. When the sliding door is open and air flows through the storage unit, carbon dioxide in the air is adsorbed by the adsorption member. When the sliding door is closed and the storage unit is suctioned, the carbon dioxide adsorbed by the adsorption member is desorbed.

[0003] Special Publication No. 2022-528676

[0004] In Patent Document 1, the opening and closing mechanism is provided integrally with the housing, which makes it difficult to handle the opening and closing mechanism.

[0005] An object of the present disclosure is to provide a suction unit whose opening and closing mechanism can be easily handled.

[0006] The first aspect relates to an adsorption unit including a storage section (11) that forms a storage chamber (S) and an adsorption member (12) that is disposed in the storage chamber (S) of the storage section (11) and adsorbs carbon dioxide in the air. The adsorption units (U1, U2) are configured from separate members and include multiple modules (M) that are connected to each other. The multiple modules (M) include an inlet-side module (M2) that has an inlet (I) through which air flows into the storage chamber (S) and an inlet-side opening / closing mechanism (41) that opens and closes the inlet (I), an adsorption module (M1) that is provided with the adsorption member (12), and an outlet-side module (M3) that has an outlet (O) through which air flows out of the storage chamber (S) and an outlet-side opening / closing mechanism (43) that opens and closes the outlet (O).

[0007] In the first aspect, the inlet-side module (M2) having the inlet-side opening / closing mechanism (41), the outlet-side module (M3) having the outlet-side opening / closing mechanism (43), and the adsorption module (M1) provided with the adsorption member (12) are configured as separate components, and these modules (M) are connected. Therefore, the outlet-side opening / closing mechanism (43) and the inlet-side opening / closing mechanism (41) can be handled separately from the adsorption module (M1). Therefore, the outlet-side opening / closing mechanism (43) and the inlet-side opening / closing mechanism (41) can be easily handled.

[0008] In a second aspect, in the first aspect, the plurality of modules (M) are connected to each other to form a storage section (11).

[0009] In the second embodiment, the storage section (11) can be formed by combining a plurality of modules (M).

[0010] In the third aspect, in the second aspect, the adsorption module (M1) has a cylindrical frame (31) that forms part of the storage section (11). The inlet module (M2) closes one end of the frame (31) in the cylindrical axis direction. The outlet module (M3) closes the other end of the frame (31) in the cylindrical axis direction.

[0011] In the third embodiment, the inlet module (M2) and the outlet module (M3) also serve as members for closing the openings on the end sides of the frame (31).

[0012] In a fourth aspect, in the second or third aspect, the plurality of modules (M) are arranged in the order of an inlet module (M2), an adsorption module (M1), and an outlet module (M3). The arrangement direction of the plurality of modules (M) is defined as a first direction, a direction perpendicular to the first direction is defined as a second direction, and a direction perpendicular to both the first and second directions is defined as a third direction. The length of the plurality of modules (M) in the first direction is shorter than the lengths of the plurality of modules (M) in the second and third directions.

[0013] In the fourth aspect, the storage section (11) can be made smaller in size in the direction in which the plurality of modules (M) are arranged.

[0014] In the fifth embodiment, in the fourth embodiment, the inlet module (M2) and the adsorption module (M1) are directly connected to each other, and the adsorption module (M1) and the outlet module (M3) are directly connected to each other.

[0015] In the fifth aspect, since there are no other modules between the inlet side module (M2) and the adsorption module (M1) or between the adsorption module (M1) and the outlet side module (M3), the storage section (11) can be further reduced in size in the arrangement direction of the multiple modules (M).

[0016] In a sixth aspect, in any one of the second to fifth aspects, the inlet-side opening and closing mechanism (41) has a plate-shaped inlet-side damper (14) that opens and closes the inlet (I), and the outlet-side opening and closing mechanism (43) has a plate-shaped outlet-side damper (15) that opens and closes the outlet (O).

[0017] In the sixth aspect, the use of the plate-shaped inlet damper (14) and the plate-shaped outlet damper (15) enables the size of the accommodating section (11) to be reduced.

[0018] In a seventh aspect, in any one of the first to sixth aspects, the plurality of modules (M) includes a fan module (M4) located upstream of the adsorption module (M1) in the air flow direction or downstream of the adsorption module (M1) in the air flow direction, the fan module (M4) having a fan (16) that transports air flowing through the storage chamber (S).

[0019] In the seventh aspect, by assembling a fan module (M4) in the suction units (U1, U2), it is possible to add a function of transporting air to the suction units (U1, U2).

[0020] The eighth aspect relates to a carbon dioxide capture system. The carbon dioxide capture system includes a first adsorption unit (U1) and a second adsorption unit (U2) as the adsorption units of any one of the first to seventh aspects, and a refrigerant circuit (R) that performs a refrigeration cycle and includes a compressor (81), a first radiator (13A) that heats the adsorption member (12) of the first adsorption unit (U1), a second radiator (13B) that heats the adsorption member (12) of the second adsorption unit (U2), a pressure reduction mechanism (82), and an evaporator (17). The first radiator (13A) is provided in the adsorption module (M1) of the first adsorption unit (U1). The second radiator (13B) is provided in the adsorption module (M1) of the second adsorption unit (U2).

[0021] In the eighth aspect, the first adsorption unit (U1) is provided with the first adsorption member (12A) and the first radiator (13A) in the adsorption module (M1), thereby adding a function of heating and regenerating the first adsorption member (12A) to the first adsorption unit (U1).The second adsorption unit (U2) is provided with the second adsorption member (12B) and the second radiator (13B) in the adsorption module (M1), thereby adding a function of heating and regenerating the second adsorption member (12B) to the second adsorption unit (U2).

[0022] The first radiator (13A) is located close to the first adsorption member (12A), which can improve the efficiency of heating and regeneration of the first adsorption member (12A).The second radiator (13B) is located close to the second adsorption member (12B), which can improve the efficiency of heating and regeneration of the second adsorption member (12B).

[0023] In a ninth aspect, in the eighth aspect, the plurality of modules (M) includes a downstream evaporator module (M5) located downstream of the outlet module (M3) in the air flow direction, and the evaporator (17) is provided in the downstream evaporator module (M5) so that the air passes through the outlet (O).

[0024] In the ninth aspect, by assembling a downstream evaporator module (M5) to each adsorption unit (U1, U2), each adsorption unit (U1, U2) can be provided with a function of recovering the heat of the regenerated air to the refrigerant circuit (R). Specifically, the heat used for heating and regenerating the adsorption member (12) can be recovered into the refrigerant in the refrigerant circuit (R) by the evaporator (17) downstream of the adsorption member (12).

[0025] In a tenth aspect, in the eighth aspect, the plurality of modules (M) includes an upstream evaporator module (M6) located upstream of the inlet module (M2) in the air flow direction, and the evaporator (17) is provided in the upstream evaporator module (M6) so that the air passes through the evaporator (17) before flowing through the inlet (I).

[0026] In the tenth aspect, by assembling an upstream evaporator module (M6) to each of the adsorption units (U1, U2), each of the adsorption units (U1, U2) can be provided with a function of cooling the air before adsorption. Specifically, the air cooled in the second evaporator (17B) flows through each of the adsorption members (12), thereby lowering the temperature of each of the adsorption members (12) and improving the adsorption efficiency of each of the adsorption members (12).

[0027] The eleventh aspect relates to a carbon dioxide capture system. The carbon dioxide capture system (1) includes a plurality of adsorption units (U1, U2) including three or more adsorption units as the adsorption units of any one of the first to seventh aspects. The plurality of adsorption units (U1, U2) are arranged side by side in a circumferential direction around an axis that is the vertical direction. Each of the storage sections (11) of the plurality of adsorption units (U1, U2) has a surface (51) that defines an air flow path (50) inside the plurality of adsorption units (U1, U2). The air flow path (50) communicates with each of the inlets (I) or each of the outlets (O) of each of the adsorption units (U1, U2).

[0028] In the eleventh aspect, the plurality of adsorption units (U1, U2) are arranged in the circumferential direction, so that an air flow path (50) shared by the adsorption units (U1, U2) is formed inside the adsorption units (U1, U2).

[0029] A twelfth aspect is any one of the eighth to eleventh aspects, further comprising a heat source unit (48) having a compressor (81) and a suction device (62) that sucks carbon dioxide from the storage chamber (S) to the outside of the storage section (11).

[0030] In the twelfth aspect, the compressor (81) and the suction device (62) are provided in a heat source unit (48) separate from the adsorption units (U1, U2), thereby making it possible to reduce the size of the adsorption units (U1, U2).

[0031] FIG. 1 is a diagram showing the overall configuration of a carbon dioxide capture system according to an embodiment. FIG. 2 is a piping diagram of a refrigeration cycle device. FIG. 3 is a perspective view of an adsorption unit. FIG. 4 is an exploded perspective view of an adsorption unit. FIG. 5 is a perspective view of an adsorption module. FIG. 6 is an exploded perspective view of an adsorption unit according to another example of the embodiment. FIG. 7 is an exploded perspective view of an adsorption unit according to Modification 1. FIG. 8 is a perspective view showing a schematic configuration of a carbon dioxide capture system according to Modification 2. FIG. 9 is a perspective view showing a schematic configuration of a carbon dioxide capture system according to Modification 3.

[0032] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the present disclosure is not limited to the embodiments shown below, and various modifications are possible within the scope of the technical concept of the present disclosure. Since the drawings are intended to conceptually explain the present disclosure, dimensions, ratios, or numbers may be exaggerated or simplified as necessary to facilitate understanding.

[0033] (1) Overall Configuration An embodiment of the present disclosure is a carbon dioxide capture system (1). The carbon dioxide capture system (1) of this example captures carbon dioxide from the air. The carbon dioxide capture system (1) of this example constitutes a DAC (Direct Air Capture) system that separates and captures carbon dioxide directly from outdoor air.

[0034] As shown in Fig. 1, the carbon dioxide capture system (1) includes an adsorption device (10), a capture device (60), a steam supply device (70), and a controller (C). As shown in Fig. 2, the carbon dioxide capture system (1) includes a refrigeration cycle device (80) having a refrigerant circuit (R).

[0035] The adsorption device (10) has a plurality of adsorption units (U1, U2). Each of the adsorption units (U1, U2) has an adsorption member (12). Each of the adsorption units (U1, U2) performs an adsorption operation of adsorbing carbon dioxide in the outdoor air onto the adsorption member (12) and a regeneration operation of regenerating and desorbing the carbon dioxide adsorbed onto the adsorption member (12).

[0036] The recovery device (60) recovers carbon dioxide desorbed from the adsorption member (12). The steam supply device (70) supplies steam to the adsorption member (12) during regeneration. The refrigeration cycle device (80) is a heat source for heating and regenerating the adsorption member (12). The controller (C) controls the adsorption device (10), the recovery device (60), the steam supply device (70), and the refrigeration cycle device (80).

[0037] (2) Overview of the Adsorption Device As shown in Fig. 1, the adsorption device (10) has a first adsorption unit (U1) and a second adsorption unit (U2) as a plurality of adsorption units. The number of the plurality of adsorption units is merely an example, and as will be described in detail later, the number may be three or more. The first adsorption unit (U1) and the second adsorption unit (U2) are disposed outside the room.

[0038] The first adsorption unit (U1) includes a first casing (11A), a first adsorption member (12A), a first radiator (13A), a first inlet damper (14A), a first outlet damper (15A), a first fan (16A), and a first evaporator (17A). The first casing (11A) is formed with a first storage chamber (S1) in which the first adsorption member (12A) and the first radiator (13A) are disposed, a first inlet (I1) through which air flows into the first storage chamber (S1), and a first outlet (O1) through which air flows out of the first storage chamber (S1).

[0039] The second adsorption unit (U2) includes a second casing (11B), a second adsorption member (12B), a second radiator (13B), a second inlet damper (14B), a second outlet damper (15B), a second fan (16B), and a second evaporator (17B). The second casing (11B) includes a second storage chamber (S2) in which the second adsorption member (12B) and the second radiator (13B) are disposed, a second inlet (12) through which air flows into the second storage chamber (S2), and a second outlet (O2) through which air flows out of the second storage chamber (S2). The first adsorption unit (U1) and the second adsorption unit (U2) will be described in detail below.

[0040] (3) Recovery Device The recovery device (60) sends carbon dioxide separated from outdoor air to a predetermined recovery unit. The recovery device (60) has a recovery flow path (61), a pump (62), and a recovery tank (63) that serves as a recovery unit.

[0041] The recovery flow path (61) is a flow path for sending carbon dioxide desorbed from the first adsorption member (12A) and the second adsorption member (12B) to the recovery tank (63). The recovery flow path (61) has a first suction path (61a), a second suction path (61b), and a main flow path (61c). One end (inlet end) of the first suction path (61a) is connected to the first casing (11A) and communicates with the first storage chamber (S1). One end (inlet end) of the second suction path (61b) is connected to the second casing (11B) and communicates with the second storage chamber (S2). One end (inlet end) of the recovery flow path (61) is connected to the other end (outlet end) of the first suction path (61a) and the other end (outlet end) of the second suction path (61b). The other end (outlet end) of the main flow path (61c) is connected to the recovery tank (63).

[0042] The pump (62) is provided in the recovery flow path (61). The pump (62) transports carbon dioxide in the recovery flow path (61). The pump (62) is a suction device that reduces the pressure in the first storage chamber (S1) and the second storage chamber (S2). The recovery tank (63) is a storage container that stores the carbon dioxide that has flowed out through the recovery flow path (61).

[0043] The recovery device (60) includes a first recovery valve (64a) and a second recovery valve (64b). The first recovery valve (64a) is provided in the first suction passage (61a). The second recovery valve (64b) is provided in the second suction passage (61b). The first recovery valve (64a) and the second recovery valve (64b) are formed as on-off valves such as solenoid on-off valves, but may also be flow rate control valves.

[0044] (4) Steam Supply Device The steam supply device (70) supplies the generated steam to the adsorption units (U1, U2) in the regenerating operation. The steam supply device (70) includes a supply path (71), a generation tank (72), and an auxiliary radiator (73).

[0045] The supply channel (71) has a first inlet channel (71a), a second inlet channel (71b), and a main supply channel (71c). One end (inlet end) of the main supply channel (71c) is connected to the top of the refinery tank (72). One end (inlet end) of the first inlet channel (71a) and one end (inlet end) of the second inlet channel (71b) are connected to the other end (outlet end) of the main supply channel (71c). The other end (outlet end) of the first inlet channel (71a) is connected to the first casing (11A) and communicates with the first storage chamber (S1). The other end (outlet end) of the second inlet channel (71b) is connected to the second casing (11B) and communicates with the second storage chamber (S2).

[0046] The first introduction passage (71a) is provided with a first introduction valve (74a), and the second introduction passage (71b) is provided with a second introduction valve (74b). The first introduction valve (74a) and the second introduction valve (74b) are configured as on-off valves such as solenoid on-off valves, but may also be flow rate control valves.

[0047] The production tank (72) is a container for generating steam. Water is supplied from a predetermined water source to the inside of the production tank (72). The auxiliary radiator (73) is disposed inside the production tank (72). The auxiliary radiator (73) generates steam by heating the water in the production tank (72). The steam generated in the production tank (72) is supplied to the adsorption units (U1, U2) in the regeneration operation via the supply path (71).

[0048] (5) Refrigeration Cycle Device As shown in Fig. 2, the refrigeration cycle device (80) has a refrigerant circuit (R) filled with a refrigerant. The refrigerant circuit (R) performs a refrigeration cycle by circulating the refrigerant. The refrigerant circuit (R) has a compressor (81), a first radiator (13A), a second radiator (13B), an auxiliary radiator (73), an expansion valve (82), a first evaporator (17A), and a second evaporator (17B).

[0049] The compressor (81) compresses the drawn refrigerant and discharges the compressed refrigerant. The first radiator (13A) and the second radiator (13B) are provided in parallel to each other in the refrigerant circuit (R). The auxiliary radiator (73) of this embodiment is provided in parallel to the first radiator (13A) and the second radiator (13B) in the refrigerant circuit (R). Specifically, the high-pressure line of the refrigerant circuit (R) has a first high-pressure flow path (85a), a second high-pressure flow path (85b), and an auxiliary high-pressure flow path (86), which are parallel to each other. The first radiator (13A) is provided in the first high-pressure flow path (85a), the second radiator (13B) is provided in the second high-pressure flow path (85b), and the auxiliary radiator (73) is provided in the auxiliary high-pressure flow path (86). The auxiliary radiator (73) may be provided in series with the first radiator (13A) and the second radiator (13B) in the refrigerant circuit (R).

[0050] The refrigerant circuit (R) has a first high-pressure on-off valve (90a) and a second high-pressure on-off valve (90b). The first high-pressure on-off valve (90a) is provided in the first high-pressure flow path (85a) upstream of the first radiator (13A). The second high-pressure on-off valve (90b) is provided in the second high-pressure flow path (85b) upstream of the second radiator (13B). The first low-pressure on-off valve (91a) and the second low-pressure on-off valve (91b) are electromagnetic on-off valves, but may be flow control valves.

[0051] The refrigerant circuit (R) has a junction flow path (87) connecting a liquid side end of the first radiator (13A) and a liquid side end of the second radiator (13B). The junction flow path (87) is a liquid line connecting the first high-pressure flow path (85a), the second high-pressure flow path (85b), and the third high-pressure flow path (85c). An expansion valve (82) is provided in the junction flow path (87). The expansion valve (82) is an example of a pressure reducing mechanism, and may be, for example, an electronic expansion valve. The evaporator (17) is provided between the expansion valve (82) and the suction portion of the compressor (81) in the refrigerant circuit (R). An auxiliary on-off valve (91) is provided in the third high-pressure flow path (85c). The auxiliary on-off valve (91) is an electromagnetic on-off valve, but may also be a flow rate control valve.

[0052] The first evaporator (17A) and the second evaporator (17B) are provided in parallel to each other in the refrigerant circuit (R). In this embodiment, the low-pressure line of the refrigerant circuit (R) has a first low-pressure flow path (88a) and a second low-pressure flow path (88b) that are parallel to each other. The first low-pressure flow path (88a) is provided with the first evaporator (17A). The second low-pressure flow path (88b) is provided with the second evaporator (17B).

[0053] The refrigerant circuit (R) has a first low-pressure on-off valve (91a) and a second low-pressure on-off valve (91b). The first low-pressure on-off valve (91a) is provided in the first low-pressure flow path (88a) upstream of the first evaporator (17A). The second low-pressure on-off valve (91b) is provided in the second low-pressure flow path (88b) upstream of the second evaporator (17B). The first low-pressure on-off valve (91a) and the second low-pressure on-off valve (91b) are electromagnetic on-off valves, but may also be flow control valves.

[0054] (6) Detailed Configuration of Suction Unit The detailed configuration of the suction unit (U) will be described in detail with reference to Figures 3 to 5. In the following description, terms such as "upper," "lower," "front," "rear," "right," and "left" are based on the directions indicated by the arrows in Figure 3. The front-to-rear direction corresponds to the first direction, the left-to-right direction corresponds to the second direction, and the up-down direction corresponds to the third direction. The first suction unit (U1) and the second suction unit (U2) are basically configured the same.

[0055] In the following description, the first adsorption unit (U1) and the second adsorption unit (U2) will be referred to as an adsorption unit (U), the first casing (11A) and the second casing (11B) as a casing (11), the first storage chamber (S1) and the second storage chamber (S2) as a storage chamber (S), the first inlet (I1) and the second inlet (I2) as an inlet (I), the first outlet (O1) and the second outlet (O2) as an outlet (O), and the first adsorption member (12A) and the second adsorption member (12B) as an adsorption section. The first radiator (13A) and the second radiator (13B) may be referred to as radiators (13), the first inlet-side damper (14A) and the second inlet-side damper (14B) as inlet-side dampers (14), the first outlet-side damper (15A) and the second outlet-side damper (15B) as outlet-side dampers (15), the first fan (16A) and the second fan (16B) as fans (16), and the first evaporator (17A) and the second evaporator (17B) as evaporators (17).

[0056] As shown in FIGS. 3 and 4 , the adsorption unit (U) has a plurality of modules (M). The plurality of modules (M) includes an adsorption module (M1), an inlet-side module (M2), and an outlet-side module (M3). In addition, the plurality of modules (M) of this embodiment also includes a fan module (M4) and a downstream evaporator module (M5). In the adsorption unit (U) of this embodiment, the fan module (M4), the inlet-side module (M2), the adsorption module (M1), the outlet-side module (M3), and the downstream evaporator module (M5) are arranged in this order from the front to the rear. The arrangement direction of the plurality of modules (M) corresponds to the first direction. The modules (M) are each composed of separate members and are connected to each other to form an integrated casing (11).

[0057] (6-1) Adsorption Module The adsorption module (M1) constitutes the main body of the adsorption unit (U). As shown in FIG. 5, the adsorption module (M1) includes a cylindrical first frame (31), an adsorption member (12), and a radiator (13). The cylindrical axis direction of the first frame (31) corresponds to the first direction, in other words, the arrangement direction of the modules (M). The adsorption module (M1) (strictly speaking, the first frame (31)) has a length in the front-rear direction (first direction) that is shorter than the length in the left-right direction (second direction) and the up-down direction (third direction). The first frame (31) is formed in a rectangular shape that is vertically elongated.

[0058] The first frame (31) has a first left frame (31a), a first right frame (31b), a first lower frame (31c), and a first upper frame (31d). The first left frame (31a) extends vertically from the left end of the first lower frame (31c) to the left end of the first upper frame (31d). The first right frame (31b) extends vertically from the right end of the first lower frame (31c) to the right end of the first upper frame (31d).

[0059] The first frame (31) has an interior formed with a storage chamber (S) for accommodating the adsorption member (12) and the radiator (13). An inlet opening (31e) is formed at one end (front end) of the first frame (31) in the axial direction. An outlet opening (31f) is formed at the other end (rear end) of the first frame (31) in the axial direction.

[0060] The radiator (13) is installed on the upper surface of the first lower frame (31c). The radiator (13) of this example has a plurality of flat tubes (20) that are heat transfer tubes. The flat tubes (20) are flat, multi-hole tubes having a plurality of refrigerant flow paths. The flat tubes (20) and their internal flow paths extend in the left-right direction (second direction). When viewed from a cross section in the first direction, the flat tubes (20) are formed in an elliptical or oval shape extending in the air flow direction (first direction). The plurality of flat tubes (20) are arranged at predetermined intervals in the up-down direction (third direction).

[0061] The radiator (13) has a first header collecting pipe (23) and a second header collecting pipe (24). The first header collecting pipe (23) extends vertically along the first left frame (31a). The second header collecting pipe (24) extends vertically along the first right frame (31b). One ends of the flat tubes (20) communicate with the interior of the first header collecting pipe (23), and the other ends of the flat tubes (20) communicate with the interior of the second header collecting pipe (24). The first header collecting pipe (23) constitutes a dividing section that divides the refrigerant (gas refrigerant) into the flat tubes (20). The second header collecting pipe (24) constitutes a confluence section that combines the refrigerant (liquid refrigerant) that has passed through the flat tubes (20).

[0062] The adsorption member (12) has a base material through which air can pass and an adsorbent supported on the base material. The base material is made of a ceramic material having a plurality of pores, a metal material having a plurality of pores, a porous material having a plurality of pores, metal fiber, carbon fiber, or the like. The thermal conductivity of the base material is preferably 1 [W / (m·K)] or more.

[0063] The adsorbent has the property of adsorbing carbon dioxide. The adsorbent is, for example, an amine-based substance. The higher the temperature of the adsorbent, the easier it is to desorb carbon dioxide, and the lower the temperature, the easier it is to adsorb carbon dioxide. Here, "adsorption" includes not only carbon dioxide being adsorbed onto the surface of a solid or liquid, but also carbon dioxide being absorbed into the interior of a solid or liquid. Furthermore, "adsorption" includes not only physical adsorption but also chemical adsorption. The adsorbent is composed of a liquid film.

[0064] The adsorption member (12) has a plurality of adsorption portions (12a) arranged between adjacent flat tubes (20). The adsorption portions (12a) are in proximity to or in contact with the surfaces of the flat tubes (20) at the ends in the thickness direction (vertical direction in this example). This facilitates transfer of heat from the flat tubes (20) to the adsorption portions (12a).

[0065] (6-2) Inlet-Side Module As shown in Fig. 4, the inlet-side module (M2) is disposed at one end (front side) of the adsorption module (M1) in the first direction. The inlet-side module (M2) closes the inlet-side opening (31e) of the first frame (31).

[0066] The inlet-side module (M2) has a cylindrical second frame (32) and a plurality of inlet-side damper units (41) arranged inside the second frame (32). The plurality of inlet-side damper units (41) are an example of an inlet-side opening / closing mechanism.

[0067] The length of the inlet module (M2) (strictly speaking, the second frame (32)) in the front-rear direction (first direction) is shorter than the length in the left-right direction (second direction) and the up-down direction (third direction). The second frame (32) is formed in a rectangular shape that is vertically long.

[0068] In this embodiment, 18 inflow side damper units (41) are arranged inside the second frame (32). Specifically, two inflow side damper units (41) are arranged horizontally, and nine columns are arranged vertically. The number and arrangement of the inflow side damper units (41) are not limited to this.

[0069] Each inlet-side damper unit (41) includes an inlet (I), a plate-shaped inlet-side damper (14) that opens and closes the inlet (I), and an inlet-side motor (42) that drives the inlet-side damper (14). In the inlet-side damper unit (41) of this embodiment, a plurality of inlet-side dampers (14) (two in this example) are provided for each inlet (I). The two inlet-side dampers (14) are arranged in the vertical direction. The inlet (I) is a hole extending in the second direction. Specifically, the inlet (I) is a horizontally elongated rectangular hole with its long side extending in the second direction and its short side extending in the third direction. The inlet-side damper (14) is formed in the shape of a plate having a predetermined thickness. The inlet-side damper (14) is formed in the shape of a horizontally elongated rectangle with its long side extending horizontally and its short side perpendicular to the long side.

[0070] The inlet side motor (42) adjusts the angle of the inlet side damper (14) around its rotation axis. The direction of the rotation axis of the inlet side motor (42) is perpendicular to the first direction. Specifically, the direction of the rotation axis of the inlet side motor (42) in this example is the second direction. The direction of the rotation axis of the inlet side motor (42) corresponds to the longitudinal direction of the inlet side damper (14). The direction of the rotation axis of the inlet side motor (42) may be a third direction, which is the vertical direction. In this case, it is preferable that the inlet side damper (14) is configured to be elongated vertically in the third direction. The inlet side damper (14) may be square when viewed in the plate thickness direction.

[0071] In this embodiment, the inlet motor (42) is disposed outside the second frame (32). Specifically, the inlet motor (42) is held by the left frame and the right frame of the second frame (32).

[0072] The inlet-side motor (42) switches the inlet-side damper (14) between an open state and a closed state. When the inlet-side damper (14) is in the closed state, the short sides of the inlet-side damper (14) are vertical; in other words, the thickness direction of the inlet-side damper (14) corresponds to the first direction (front-to-back direction). When the inlet-side damper (14) is in the open state, the short sides of the inlet-side damper (14) are horizontal; in other words, the thickness direction of the inlet-side damper (14) corresponds to the third direction (up-down direction). Because the inlet-side damper (14) is in the shape of a plate extending along the rotation axis, the space required for opening and closing the inlet-side damper (14) can be minimized.

[0073] (6-3) Outlet-Side Module As shown in Fig. 4, the outlet-side module (M3) is disposed on the other end (rear side) of the adsorption module (M1) in the first direction. The outlet-side module (M3) closes the outlet-side opening (31f) of the first frame (31).

[0074] The outlet-side module (M3) has a cylindrical third frame (33) and a plurality of outlet-side damper units (43) arranged inside the third frame (33). The plurality of outlet-side damper units (43) are an example of an outlet-side opening / closing mechanism.

[0075] The length of the outlet module (M3) (strictly speaking, the third frame (33)) in the first direction is shorter than the lengths of the third and second directions. The third frame (33) is formed in a vertically elongated rectangular shape.

[0076] In this embodiment, 18 outlet side damper units (43) are arranged inside the third frame (33). Specifically, two outlet side damper units (43) are arranged in the horizontal direction, and nine rows are arranged in the vertical direction. The number and arrangement of the outlet side damper units (43) are not limited to this.

[0077] Each outlet-side damper unit (43) includes an outlet (O), a plate-shaped outlet-side damper (15) that opens and closes the outlet (O), and an outlet-side motor (44) that drives the outlet-side damper (15). In the present embodiment, the outlet-side damper unit (43) is provided with a plurality of (two in this example) outlet-side dampers (15) for each outlet (O). The two outlet-side dampers (15) are arranged in the vertical direction. The outlet (O) is a rectangular hole extending in the second direction. Specifically, the outlet (O) is a horizontally elongated rectangular hole with its long side extending in the second direction and its short side extending in the third direction. The outlet-side damper (15) is formed in the shape of a plate having a predetermined thickness. The outlet-side damper (15) is formed in the shape of a horizontally elongated rectangle having a long side extending horizontally and a short side perpendicular to the long side.

[0078] The outlet-side motor (44) adjusts the angle of the outlet-side damper (15) around its rotation axis. The direction of the rotation axis of the outlet-side motor (44) is perpendicular to the first direction. Specifically, the direction of the rotation axis of the outlet-side motor (44) in this example is the second direction. The direction of the rotation axis of the outlet-side motor (44) corresponds to the longitudinal direction of the outlet-side damper (15). The direction of the rotation axis of the outlet-side motor (44) may be a third direction, which is the vertical direction. In this case, it is preferable that the outlet-side damper (15) is configured to be elongated vertically in the third direction. The outlet-side damper (15) may be square when viewed in the thickness direction.

[0079] In this embodiment, the outflow motor (44) is disposed outside the third frame (33). Specifically, the outflow motor (44) is held by the left frame of the third frame (33) and the right frame of the third frame (33).

[0080] The outlet-side motor (44) switches the outlet-side damper (15) between an open state and a closed state. When the outlet-side damper (15) is in the closed state, the short sides of the outlet-side damper (15) are vertical; in other words, the thickness direction of the outlet-side damper (15) corresponds to the first direction (front-to-back direction). When the outlet-side damper (15) is in the open state, the short sides of the outlet-side damper (15) are horizontal; in other words, the thickness direction of the outlet-side damper (15) corresponds to the third direction (up-down direction). Because the outlet-side damper (15) is in the shape of a plate extending along the rotation axis, the space required for opening and closing the outlet-side damper (15) can be minimized.

[0081] 3 and 4, the fan module (M4) of this embodiment is disposed upstream of the adsorption module (M1) in the air flow direction. Specifically, the fan module (M4) is disposed on one end (front side) of the inlet module (M2) in the first direction.

[0082] The fan module (M4) has a cylindrical fourth frame (34), a fan support (26) arranged inside the fourth frame (34), and a fan (16) supported by the fan support (26).

[0083] The fan module (M4) (strictly speaking, the fourth frame (34)) has a length in the front-rear direction (first direction) that is shorter than the length in the left-right direction (second direction) and the up-down direction (third direction). The fourth frame (34) is formed in a rectangular shape that is vertically long. An intake port (45) for introducing outdoor air into the casing (11) is formed at one end (front side) of the fourth frame (34).

[0084] The fan support portion (26) of this embodiment has a stay (26a) extending vertically from the bottom frame to the top frame of the fourth frame (34). The stay (26a) may extend horizontally from the left frame to the right frame of the fourth frame (34). The fan support portion (26) and the fan (16) are disposed at a central position in the left-right direction (second direction) of the fan module (M4).

[0085] The fan (16) is fixed to the stay (26a). In this embodiment, two fans (16) are arranged one above the other. The fan (16) is a propeller fan. The fan (16) transports air flowing through the storage chamber (S).

[0086] (6-5) Outlet-Side Evaporator Module As shown in Fig. 4, the downstream-side evaporator module (M5) is disposed downstream of the outlet-side module (M3) in the air flow direction. Specifically, the downstream-side evaporator module (M5) is disposed on the other end side (rear side) of the outlet-side module (M3) in the first direction.

[0087] The downstream evaporator module (M5) has a cylindrical fifth frame (35) and an evaporator (17) disposed inside the fifth frame (35). An outlet (46) for discharging air from inside the casing (11) to the outside of the room is formed on the other end (rear side) of the fifth frame (35).

[0088] The length of the outlet-side evaporator module (strictly speaking, the fifth frame (35)) in the front-rear direction (first direction) is shorter than the length in the left-right direction (second direction) and the up-down direction (third direction). The fifth frame (35) is formed in a rectangular shape that is vertically long.

[0089] The evaporator (17) is disposed inside the fifth frame (35). The evaporator (17) is a fin-and-tube air heat exchanger having a heat transfer tube and a plurality of fins through which the heat transfer tube passes. The evaporator (17) may be a heat exchanger in which a plurality of flat tubes are disposed between two header pipes, similar to the above-described radiator (13). The evaporator (17) of this embodiment receives air that has passed through the adsorption member (12).

[0090] (6-6) Connection Structure As shown in Fig. 4, the casing (11) is constructed by connecting the above-mentioned modules (M) in the arrangement direction (transverse direction). Specifically, the adsorption module (M1) and the inlet-side module (M2) are directly connected, and the adsorption module (M1) and the outlet-side module (M3) are directly connected. The inlet-side module (M2) and the fan module (M4) are directly connected, and the outlet-side module (M3) and the downstream evaporator module (M5) are directly connected.

[0091] The frames (31-35) of each module (M) are arranged so as to overlap one another when viewed from a first direction. The first frame (31) and the second frame (32) are directly connected, and the first frame (31) and the third frame (33) are directly connected. The second frame (32) and the fourth frame (34) are directly connected, and the fourth frame (34) and the fifth frame (35) are directly connected. The modules (M) are configured to be detachable from one another. This allows maintenance and replacement of the equipment installed in each module (M) while the modules (M) are detached. Furthermore, the order of the modules (M) can be changed before they are connected to one another.

[0092] (7) Operation The operation of the carbon dioxide capture system (1) will be described. The carbon dioxide capture system (1) alternates between a first operation and a second operation. In the first operation, the first adsorption unit (U1) performs a regeneration operation while the second adsorption unit (U2) performs an adsorption operation. In the second operation, the first adsorption unit (U1) performs an adsorption operation while the second adsorption unit (U2) performs a regeneration operation. The first adsorption unit (U1) and the second adsorption unit (U2) repeatedly alternate between the adsorption operation and the regeneration operation.

[0093] (7-1) First Operation In the first operation, the second fan (16B), the compressor (81), and the pump (62) are in an operating state. The first inlet damper (14A) and the first outlet damper (15A) are closed, the second inlet damper (14B) and the second outlet damper (15B) are closed, the first recovery valve (64a) is open, the second recovery valve (64b) is closed, the first introduction valve (74a) is open, the second introduction valve (74b) is closed, the first high-pressure on-off valve (90a) is open, the second high-pressure on-off valve (90b) is closed, the first low-pressure on-off valve (91a) is closed, and the second low-pressure on-off valve (91b) is open.

[0094] In the refrigerant circuit (R) during the first operation, the refrigerant compressed by the compressor (81) dissipates heat (condenses) in the first radiator (13A) and the auxiliary radiator (73). The refrigerant that has dissipated heat is reduced in pressure by the expansion valve (82), evaporated in the second evaporator (17B), and then compressed again by the compressor (81).

[0095] In the first operation, outdoor air transported by the second fan (16B) flows into the second storage chamber (S2) through the second inlet (I2). In the second storage chamber (S2), carbon dioxide in the air is adsorbed by the second adsorption member (12B). After passing through the second adsorption member (12B), the air flows out through the second outlet (O2) and passes through the second evaporator (17B). In the second evaporator (17B), heat is exchanged between the air and the refrigerant, and the heat of the air is recovered as the heat of evaporation of the refrigerant. After passing through the second evaporator (17B), the air is discharged to the outdoor space.

[0096] In the first operation, the first radiator (13A) heats the first adsorption member (12A). As a result, carbon dioxide is desorbed from the first adsorption member (12A). When the pump (62) is operated, the first storage chamber (S1) is brought into negative pressure. As a result, desorption of carbon dioxide from the first adsorption member (12A) is promoted.

[0097] In the generation tank (72), water heated by the auxiliary radiator (73) is converted into water vapor. The water vapor generated in the generation tank (72) flows into the first storage chamber (S1) through the supply channel (71). The supply of water vapor to the periphery of the first adsorption member (12A) promotes desorption of carbon dioxide in the first adsorption member (12A).

[0098] The carbon dioxide desorbed from the first adsorption member (12A) is sent to the recovery tank (63) through the recovery passageway (61). The carbon dioxide is stored in the recovery tank (63).

[0099] (7-2) Second Operation In the second operation, the first fan (16A), the compressor (81), and the pump (62) are in an operating state. The first inlet damper (14A) and the first outlet damper (15A) are in an open state, the second inlet damper (14B) and the second outlet damper (15B) are in a closed state, the first recovery valve (64a) is in a closed state, the second recovery valve (64b) is in an open state, the first introduction valve (74a) is in a closed state, the second introduction valve (74b) is in an open state, the first high-pressure on-off valve (90a) is in a closed state, the second high-pressure on-off valve (90b) is in an open state, the first low-pressure on-off valve (91a) is in an open state, and the second low-pressure on-off valve (91b) is in a closed state.

[0100] In the refrigerant circuit (R) during the second operation, the refrigerant compressed by the compressor (81) dissipates heat (condenses) in the second radiator (13B) and the auxiliary radiator (73). The refrigerant that has dissipated heat is reduced in pressure by the expansion valve (82), evaporated in the first evaporator (17A), and then compressed again by the compressor (81).

[0101] In the second operation, outdoor air transported by the first fan (16A) flows into the first storage chamber (S1) through the first inlet (I1). In the first storage chamber (S1), carbon dioxide in the air is adsorbed by the first adsorption member (12A). The air that has passed through the first inlet (I1) flows out through the first outlet (O1) and passes through the first evaporator (17A). In the first evaporator (17A), heat is exchanged between the air and the refrigerant, and the heat of the air is recovered as the heat of evaporation of the refrigerant. The air that has passed through the first evaporator (17A) is discharged to the outdoor space.

[0102] In the second operation, the second radiator (13B) heats the second adsorption member (12B). As a result, carbon dioxide is desorbed from the second adsorption member (12B). When the pump (62) is operated, the second storage chamber (S2) is brought into negative pressure. As a result, desorption of carbon dioxide from the second adsorption member (12B) is promoted.

[0103] In the generation tank (72), water heated by the auxiliary radiator (73) is converted into water vapor. The water vapor generated in the generation tank (72) flows into the second storage chamber (S2) through the supply channel (71). The supply of water vapor to the periphery of the second adsorption member (12B) promotes desorption of carbon dioxide in the second adsorption member (12B).

[0104] The carbon dioxide desorbed from the second adsorption member (12B) is sent to the recovery tank (63) through the recovery passageway (61). The carbon dioxide is stored in the recovery tank (63).

[0105] (8) Features (8-1) The adsorption units (U1, U2) include a plurality of modules (M) that are formed from separate members and are connected to one another. The plurality of modules (M) include an inlet-side module (M2) having an inlet (I) through which air flows into the storage chamber (S) and an inlet-side damper unit (41) that opens and closes the inlet (I), an adsorption module (M1) that is provided with an adsorption member (12), and an outlet-side module (M3) having an outlet (O) through which air flows out of the storage chamber (S) and an outlet-side damper unit (43) that opens and closes the outlet (O).

[0106] In this configuration, the inlet-side damper unit (41) and the outlet-side damper unit (43) are configured as separate members from the adsorption module (M1), so that the inlet-side damper unit (41) and the outlet-side damper unit (43) can be handled separately from the adsorption member (12) and the radiator (13). Specifically, for example, the inlet-side module (M2) can be separated from the other modules (M) to perform replacement or maintenance of the inlet-side damper unit (41). Alternatively, the outlet-side module (M3) can be separated from the other modules (M) to perform replacement or maintenance of the outlet-side damper unit (43).

[0107] (8-2) The plurality of modules (M) are connected to each other to form a casing (11).

[0108] In this configuration, each module (M) can be handled separately and a casing made of a single part is not required.

[0109] (8-3) The adsorption module (M1) has a cylindrical first frame (31) that constitutes part of the casing (11). The inlet module (M2) closes one end of the first frame (31) in the cylindrical axis direction. The outlet module (M3) closes the other end of the first frame (31) in the cylindrical axis direction. In this configuration, the inlet module (M2) and the outlet module (M3) also serve as members that close the openings of the first frame (31).

[0110] (8-4) In the plurality of modules (M), an inlet-side module (M2), an adsorption module (M1), and an outlet-side module (M3) are arranged in this order. If the arrangement direction of the plurality of modules (M) is defined as a first direction, a direction perpendicular to the first direction is defined as a second direction, and a direction perpendicular to the first direction and the second direction is defined as a third direction, the length of the plurality of modules (M) in the first direction is shorter than the lengths of the plurality of modules (M) in the second and third directions.

[0111] This configuration allows the casing (11) to be made smaller in size in the direction in which the modules (M) are arranged. The reduced volume of the storage chamber (S) allows the pump (62) to quickly reduce the internal pressure of the storage chamber (S) to a negative pressure in the adsorption unit (U) during regeneration. This improves the efficiency of regeneration of the adsorption member (12).

[0112] (8-5) The inlet module (M2) and the adsorption module (M1) are directly connected to each other. The adsorption module (M1) and the outlet module (M3) are directly connected to each other.

[0113] In this configuration, since there are no other modules between the inlet module (M2) and the adsorption module (M1) or between the adsorption module (M1) and the outlet module (M3), the storage chamber (S) can be made smaller in size in the direction of arrangement of the modules (M). This reduced volume of the storage chamber (S) allows the pump (62) to quickly reduce the internal pressure of the storage chamber (S) to a negative pressure in the adsorption unit (U) during regeneration. This improves the regeneration efficiency of the adsorption member (12).

[0114] (8-6) The inlet damper unit (41) has a plate-shaped inlet damper (14) that opens and closes the inlet (I). The outlet damper unit (43) has a plate-shaped outlet damper (15) that opens and closes the outlet (O). By using the plate-shaped inlet damper (14) or the plate-shaped outlet damper (15), the casing (11) can be made smaller.

[0115] (8-7) The plurality of modules (M) includes a fan module (M4) located upstream of the inlet module (M2) in the air flow direction. The fan module (M4) has a fan (16) that transports air flowing through the storage chamber (S).

[0116] In this configuration, the fan module (M4) can be separated from the other modules (M), making it easier to handle the fan (16). Specifically, replacement and maintenance of the fan (16) can be easily performed.

[0117] Additionally, the arrangement of the fan module (M4) in the casing (11) can be changed. Specifically, for example, as shown in FIG. 6, the fan module (M4) can be arranged downstream of the outlet module (M3) in the air flow direction. In the example of FIG. 6, the fan module (M4) is arranged downstream of the downstream evaporator module (M5). In this case, the fan (16) is located downstream of the adsorption member (12). The fan module (M4) can be arranged between the outlet module (M3) and the downstream evaporator module (M5), or, for example, between the inlet module (M2) and the adsorption module (M1), or between the outlet module (M3) and the adsorption module (M1).

[0118] (8-8) The carbon dioxide capture system (1) uses the radiator (13) of the refrigeration cycle device (80) as a heat source to heat and regenerate the adsorption member (12). This improves the energy consumption efficiency of the carbon dioxide capture system (1) compared to when a heater is used as a heat source, for example.

[0119] (8-9) The adsorption module (M1) is provided with a radiator (13) together with the adsorption member (12). The radiator (13) is located close to the adsorption member (12), so that the adsorption member (12) can be efficiently heated, and the regeneration efficiency of the adsorption member (12) can be improved.

[0120] (8-10) The plurality of modules (M) includes a downstream evaporator module (M5) located downstream of the outlet module (M3) in the air flow direction. The evaporator (17) is provided in the downstream evaporator module (M5) so that the air passes through the outlet (O).

[0121] In this configuration, the air that has passed through the adsorption member (12) during the regeneration operation passes through the evaporator (17). In the evaporator (17), the residual heat of the air used to regenerate the adsorption member (12) can be used as the heat of evaporation of the refrigerant. In other words, the residual heat of the air can be recovered in the refrigerant in the refrigerant circuit (R), and this heat can be used to regenerate the adsorption member (12).

[0122] As will be described in detail later, the arrangement of the evaporator modules (M5, M6) each having an evaporator (17) can also be changed.

[0123] (9) Modifications The above embodiment may have the following modified configurations: In the following explanation, differences from the above embodiment will be mainly described.

[0124] (9-1) Modification 1 As shown in FIG. 7 , the adsorption unit (U) of Modification 1 has an upstream evaporator module (M6) instead of the downstream evaporator module (M5) of the embodiment. The upstream evaporator module (M6) is disposed upstream of the inlet module (M2) in the air flow direction. Specifically, the upstream evaporator module (M6) is disposed between the inlet module (M2) and the fan module (M4).

[0125] The upstream evaporator module (M6) has a cylindrical sixth frame (36) and an evaporator (17) disposed inside the sixth frame (36). An inlet (45) for introducing outdoor air into the casing (11) is formed at one end (front side) of the sixth frame (36).

[0126] The upstream evaporator module (strictly speaking, the sixth frame (36)) has a length in the front-rear direction (first direction) that is shorter than the length in the left-right direction (second direction) and the length in the up-down direction (third direction). The sixth frame (36) is formed in a rectangular shape that is vertically long.

[0127] The evaporator (17) is disposed inside the sixth frame (36). In the adsorption operation, the evaporator (17) cools the outdoor air before it passes through the adsorption member (12). The outdoor air is cooled, thereby decreasing the temperature of the adsorption member (12). As a result, the adsorption efficiency of the adsorption member (12) increases.

[0128] The evaporator (17) may dehumidify the outdoor air by cooling it to a temperature equal to or lower than the dew point temperature. In this case, the control unit (C) adjusts the evaporation pressure of the evaporator (17), specifically the rotation speed of the compressor (81), so as to dehumidify the outdoor air. By dehumidifying the outdoor air, adhesion of moisture in the air to the adsorption member (12) can be suppressed. As a result, deterioration of the adsorbent of the adsorption member (12) due to the influence of moisture can be suppressed.

[0129] (9-2) Modification 2 As shown in FIG. 8 , the carbon dioxide capture system (1) of Modification 2 has three or more (five in this example) adsorption units (U). The configuration of the adsorption units (U) is the same as in the above-described embodiment. The multiple adsorption units (U) are arranged side by side in the circumferential direction around an axis that is the vertical direction. In this example, the first adsorption unit (U1) and the second adsorption unit (U2) are arranged closer to the front, the third adsorption unit (U3) is arranged closer to the right, and the fourth adsorption unit (U4) and the fifth adsorption unit (U5) are arranged closer to the rear.

[0130] In addition, the carbon dioxide recovery system (1) has a heat source unit (48). The heat source unit (48) has a heat source side casing (49), and a compressor (81) and a pump (62) arranged inside the heat source side casing (49). Refrigerant piping and valves of the refrigerant circuit (R) and piping and valves of the recovery flow path (61) are provided inside the heat source side casing (49). A water vapor supply device (70) may be arranged inside the heat source side casing (49).

[0131] The plurality of adsorption units (U) and the heat source unit (48) are arranged so as to form an air flow path (50) therein.

[0132] Specifically, each adsorption unit (U) is disposed such that its rear surface (51) (inner surface) defines an air flow path (50). An outlet (46) is formed in the rear surface (51). An inlet (45) is formed in the outer surface of each adsorption unit (U). The air flow path (50) communicates with each outlet (O) via the outlet (46) of each adsorption unit (U).

[0133] In the second modification, when the fan (16) of the adsorption unit (U) is operating during the adsorption operation, outdoor air passes through the inlet (45) and the inlet (I) of the adsorption unit (U) and flows into the storage chamber (S). After passing through the adsorption member (12) of the storage chamber (S), the air passes through the outlet (O) and the outlet (46) and flows into the air flow path (50). The air in the air flow path (50) is blown upward.

[0134] In the second modification, three or more adsorption units (U) are arranged in the circumferential direction around an axis that is in the vertical direction, so that air flow paths (50) can be formed inside these adsorption units (U). These air flow paths (50) are shared by the multiple adsorption units (U). This allows the number of parts of the carbon dioxide capture system (1) to be reduced.

[0135] In the second modification, the compressor (81) and the pump (62) are not provided in the adsorption unit (U) but in the heat source unit (48), which allows the adsorption unit (U) to be further reduced in size.

[0136] In this example, the air flow path (50) is formed inside the plurality of adsorption units (U) and the heat source units (48) arranged in the circumferential direction, but the heat source units (48) may be omitted. In this case, the air flow path (50) is formed inside the plurality of adsorption units (U) arranged in the circumferential direction.

[0137] The adsorption unit (U) of the second modification may be disposed in the opposite direction in the short-side direction. Specifically, the air flow path (50) may communicate with the inlet (I) through the suction port (45). When the fan (16) of the adsorption unit (U) is operating during adsorption operation, outdoor air flows downward through the air flow path (50), passes through the suction port (45) and the inlet (I) of the adsorption unit (U), and enters the storage chamber (S). After passing through the adsorption member (12) of the storage chamber (S), the air passes through the outlet (O) and the discharge port (46) and is blown outward in the radial direction from the adsorption unit (U).

[0138] (9-3) Modification 3 As shown in FIG. 9, the carbon dioxide capture system (1) of Modification 3 differs from Modification 2 in the arrangement of the fan (16). In Modification 3, the fan (16) is arranged in the air flow path (50). The fan (16) is arranged near the upper side of the air flow path (50). The fan (16) is supported by a stay (not shown). The fan (16) blows air upward. Each adsorption unit (U) does not have the fan module (M4) of the embodiment.

[0139] In the second modification, when the fan (16) is operated, outdoor air passes through the inlet (45) and the inlet (I) of the adsorption unit (U) performing adsorption operation and flows into the storage chamber (S). After passing through the adsorption member (12) of the storage chamber (S), the air passes through the outlet (O) and the outlet (46) and flows into the air flow path (50). The air in the air flow path (50) passes through the fan (16) and is blown upward.

[0140] In the third modification, the fan (16) is shared by a plurality of suction units (U), so that the number of fans (16) can be reduced.

[0141] In the third modification, when the fan (16) of the adsorption unit (U) is operating during the adsorption operation, outdoor air passes through the inlet (45) and the inlet (I) of the adsorption unit (U) and flows into the storage chamber (S). After passing through the adsorption member (12) of the storage chamber (S), the air passes through the outlet (O) and the outlet (46) and flows into the air flow path (50). The air in the air flow path (50) is blown upward.

[0142] The adsorption unit (U) of the third modification may be disposed in the opposite direction in the short-side direction. Specifically, the air flow path (50) may communicate with the inlet (I) through the suction port (45). When the fan (16) is operated, outdoor air passes through the fan (16) and flows downward through the air flow path (50). This air passes through the suction port (45) and the inlet (I) of the adsorption unit (U) and flows into the storage chamber (S). After passing through the adsorption member (12) of the storage chamber (S), the air passes through the outlet (O) and the discharge port (46) and is blown outward in the radial direction from the adsorption unit (U).

[0143] (10) Other Embodiments In the above-described embodiment and each modification, the following configuration may be adopted.

[0144] The adsorption unit (U) may not have the fan module (M4), the upstream evaporator module (M6), or the downstream evaporator module (M5). In this case, for example, a duct may be connected to the casing (11), and the fan (16) and the evaporator (17) may be disposed in the duct.

[0145] The heat source for heating the adsorption member (12) does not have to be a refrigeration cycle device, and may be a heater.

[0146] Each module (M) may have a frame member for supporting the corresponding device instead of the frame body (31). In this case, the frame members of each module (M) are connected to each other. The adsorption unit (U) has a casing that houses the connected frame members.

[0147] The carbon dioxide capture system (1) does not have to be a DAC system that directly captures carbon dioxide from the atmosphere. For example, the carbon dioxide capture system (1) may capture carbon dioxide from a mixture of air and industrial exhaust gases.

[0148] The pressure reducing mechanism does not have to be the expansion valve (82) and may be a capillary tube or an expander that recovers the power of the refrigerant. The expansion valve (82) may be a temperature sensitive expansion valve.

[0149] The adsorbing member (12) may adsorb carbon dioxide in room air instead of outdoor air. The adsorbing member (12) may be applied to, for example, a ventilation system for ventilating a room.

[0150] The inflow side switching mechanism and the outflow side switching mechanism may be a slide shutter or a valve such as a ball valve that switches the air flow.

[0151] The capture unit that captures carbon dioxide does not have to be a capture tank, and may be, for example, an adsorption unit that adsorbs the captured carbon dioxide. The carbon dioxide capture system (1) does not necessarily have to have a capture unit. The capture device (60) may introduce the captured carbon dioxide underground. In other words, the capture unit that captures carbon dioxide may be soil.

[0152] Although the embodiments and modifications have been described above, it will be understood that various modifications in form and details are possible without departing from the spirit and scope of the claims. Furthermore, the above embodiments, modifications, and other embodiments may be combined or substituted as appropriate as long as the functionality of the subject matter of the present disclosure is not impaired.

[0153] The above-mentioned descriptions such as "first," "second," "third," etc. are used to distinguish the words to which these descriptions are attached, and do not limit the number or order of the words.

[0154] As explained above, the present disclosure is useful for adsorption units and carbon dioxide capture systems.

[0155] 1 Carbon dioxide capture system 11 Casing (accommodation section) 12 Adsorption member 13A First radiator 13B Second radiator 14 Inlet damper 15 Outlet damper 16 Fan 17 Evaporator 31 First frame (frame) 41 Inlet damper unit (inlet opening / closing mechanism) 43 Outlet damper unit (outlet opening / closing mechanism) 48 Heat source unit 50 Air flow path 51 Back surface (face) 62 Pump (suction device) 81 Compressor 82 Expansion valve (pressure reducing mechanism) I Inlet M Module M1 Adsorption module M2 Inlet module M3 Outlet module M4 Fan module M5 Downstream evaporator module M6 Upstream evaporator module O Outlet R Refrigerant circuit S Accommodation chamber U Adsorption unit U1 First adsorption unit U2 Second adsorption unit

Claims

1. An adsorption unit comprising a storage section (11) forming a storage chamber (S) and an adsorption member (12) disposed in the storage chamber (S) of the storage section (11) and adsorbing carbon dioxide in the air, the adsorption unit comprising a plurality of modules (M) formed from separate members and connected to one another, the plurality of modules (M) including: an inlet-side module (M2) having an inlet (I) for allowing air to flow into the storage chamber (S) and an inlet-side opening / closing mechanism (41) for opening and closing the inlet (I); an adsorption module (M1) in which the adsorption member (12) is provided; and an outlet-side module (M3) having an outlet (O) for allowing air to flow out of the storage chamber (S) and an outlet-side opening / closing mechanism (43) for opening and closing the outlet (O).

2. The suction unit according to claim 1, wherein the plurality of modules (M) are connected to each other to form the storage section (11).

3. The adsorption unit according to claim 2, wherein the adsorption module (M1) has a cylindrical frame (31) that forms part of the storage section (11), the inlet module (M2) closes one end of the frame (31) in the cylindrical axis direction, and the outlet module (M3) closes the other end of the frame (31) in the cylindrical axis direction.

4. The adsorption unit according to claim 2 or 3, wherein the plurality of modules (M) are arranged in the order of the inlet module (M2), the adsorption module (M1), and the outlet module (M3), and the arrangement direction of the plurality of modules (M) is defined as a first direction, a direction perpendicular to the first direction is defined as a second direction, and a direction perpendicular to the first direction and the second direction is defined as a third direction, the length of the plurality of modules (M) in the first direction is shorter than the lengths of the plurality of modules (M) in the second and third directions.

5. The adsorption unit according to claim 4, wherein the inlet module (M2) and the adsorption module (M1) are directly connected to each other, and the adsorption module (M1) and the outlet module (M3) are directly connected to each other.

6. The adsorption unit according to any one of claims 1 to 5, wherein the inlet opening / closing mechanism (41) has a plate-shaped inlet damper (14) that opens and closes the inlet (I), and the outlet opening / closing mechanism (43) has a plate-shaped outlet damper (15) that opens and closes the outlet (O).

7. An adsorption unit according to any one of claims 1 to 6, wherein the plurality of modules (M) includes a fan module (M4) located upstream of the adsorption module (M1) in the air flow or downstream of the adsorption module (M1) in the air flow, and the fan module (M4) has a fan (16) that transports air flowing through the storage chamber (S).

8. A carbon dioxide recovery system comprising: a first adsorption unit (U1) and a second adsorption unit (U2) as adsorption units according to any one of claims 1 to 7; and a refrigerant circuit (R) having a compressor (81), a first radiator (13A) that heats the adsorption member (12) of the first adsorption unit (U1), a second radiator (13B) that heats the adsorption member (12) of the second adsorption unit (U2), a pressure reducing mechanism (82), and an evaporator (17) and performing a refrigeration cycle, wherein the first radiator (13A) is provided in an adsorption module (M1) of the first adsorption unit (U1), and the second radiator (13B) is provided in an adsorption module (M1) of the second adsorption unit (U2).

9. The carbon dioxide capture system according to claim 8, wherein the plurality of modules (M) includes a downstream evaporator module (M5) located downstream of the outlet module (M3) in the air flow, and the evaporator (17) is provided in the downstream evaporator module (M5) so that the air passes through the outlet (O).

10. The carbon dioxide capture system according to claim 8, wherein the plurality of modules (M) includes an upstream evaporator module (M6) located upstream of the inlet module (M2) in the air flow, and the evaporator (17) is provided in the upstream evaporator module (M6) so that air passes through the upstream evaporator module (M6) before flowing through the inlet (I).

11. A carbon dioxide capture system comprising a plurality of adsorption units (U1, U2) including three or more adsorption units as the adsorption unit according to any one of claims 1 to 7, wherein the plurality of adsorption units (U1, U2) are arranged side by side in a circumferential direction around an axis that is the vertical direction, and each of the storage sections (11) of the plurality of adsorption units (U1, U2) has a surface (51) that defines an air flow path (50) inside the plurality of adsorption units (U1, U2), and the air flow path (50) communicates with each of the inlets (I) or each of the outlets (O) of each of the adsorption units (U1, U2).

12. The carbon dioxide capture system according to any one of claims 8 to 11, further comprising a heat source unit (48) having the compressor (81) and a suction device (62) that sucks carbon dioxide from the storage chamber (S) to the outside of the storage section (11).

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