Carbon dioxide recovery system

Abstract

A carbon dioxide recovery system (1) includes: a refrigerant circuit (R) having a first adsorption member (15A) and a second adsorption member (15B) that adsorb carbon dioxide in target air, respectively, and a refrigerant flow path switching mechanism (90) that switches the flow of the refrigerant to a first heat sink (18A) and a second heat sink (18B) that are arranged side by side, and performs a refrigeration cycle; a first housing portion (11A) that forms a first space (S1) in which the first adsorption member (15A) and the first heat sink (18A) are arranged; a second housing portion (11B) that forms a second space (S2) in which the second adsorption member (15B) and the second heat sink (18B) are arranged; an air flow path switching mechanism (30) that switches the air flow of the first space (S1) and the second space (S2); and a recovery unit (60) that selectively recovers carbon dioxide that is desorbed from the first adsorption member (15A) and the second adsorption member (15B).

Description

Technical Field

[0001] This disclosure relates to a carbon dioxide recovery system. Background Technology

[0002] Systems exist for recovering carbon dioxide from the air. Patent Document 1 describes a carbon dioxide recovery system comprising an adsorption plate loaded with an adsorbent and a flow pipe for heating the adsorption plate. Carbon dioxide in the air is adsorbed by the adsorbent. A heating medium flowing in the flow pipe heats and regenerates the adsorbent on the adsorption plate. The carbon dioxide released from the adsorbent is pumped and stored.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2023-13169 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In the carbon dioxide recovery system disclosed in Patent Document 1, it is desirable to improve energy consumption efficiency.

[0008] The purpose of this disclosure is to improve the energy consumption efficiency of carbon dioxide recovery systems.

[0009] Methods for solving problems

[0010] The first method is based on a carbon dioxide recovery system. The carbon dioxide recovery system (1) includes: a first adsorption unit (15A) and a second adsorption unit (15B), which respectively adsorb carbon dioxide from the target air; a refrigerant circuit (R) for a refrigeration cycle, which includes a compressor (81), a first radiator (18A) and a second radiator (18B) arranged in parallel, a pressure reducing mechanism (82), an evaporator (36, 36A, 36B), and a refrigerant flow path switching mechanism (90) for switching the refrigerant flow between the first radiator (18A) and the second radiator (18B); the first The container (11A) has a first space (S1) in which a first adsorption component (15A) and a first radiator (18A) are arranged; a second container (11B) has a second space (S2) in which a second adsorption component (15B) and a second radiator (18B) are arranged; an airflow switching mechanism (30) switches the airflow between the first space (S1) and the second space (S2); and a recovery unit (60) selectively recovers carbon dioxide that has escaped from the first adsorption component (15A) and the second adsorption component (15B).

[0011] In the first configuration, the refrigerant flow path switching mechanism (90) selectively directs the refrigerant to either the first radiator (18A) or the second radiator (18B). The air flow path switching mechanism (30) selectively directs the target air to either the first space (S1) or the second space (S2). This enables the following actions: simultaneously adsorbing carbon dioxide from the target air onto the first adsorption component (15A) in the first space (S1) and heating / regenerating the second adsorption component (15B) using the second radiator (18B); and simultaneously adsorbing carbon dioxide from the target air onto the second adsorption component (15B) in the second space (S2) and heating / regenerating the first adsorption component (15A) using the first radiator (18A). Carbon dioxide detached from the first adsorption component (15A) and the second adsorption component (15B) is recovered by the recovery unit (60).

[0012] Thus, a refrigerant circuit (R) that performs a refrigeration cycle is used as the heat source for heating / regenerating the first adsorption unit (15A) and the second adsorption unit (15B). Therefore, energy consumption efficiency can be improved compared to heat sources such as heaters.

[0013] The second method, based on the first method, includes a recovery unit (60) having: a recovery flow path (61) for conveying carbon dioxide detached from the first adsorption component (15A) and the second adsorption component (15B) to a designated recovery section (63); and a recovery switching mechanism (64) for switching the flow of carbon dioxide in the recovery flow path (61). The carbon dioxide recovery system (1) also includes a control unit (C) that controls the refrigerant flow path switching mechanism (90), the air flow path switching mechanism (30), and the recovery switching mechanism (64) to perform a first operation and a second operation. In the first operation, the first radiator (18A) heats the first adsorption component (15A), the target air flows in the second space (S2), and the carbon dioxide that has separated from the first adsorption component (15A) is transported to the recovery unit (63) side via the recovery flow path (61). In the second operation, the second radiator (18B) heats the second adsorption component (15B), the target air flows in the first space (S1), and the carbon dioxide that has separated from the second adsorption component (15B) is transported to the recovery unit (63) side via the recovery flow path (61).

[0014] In the second method, the control unit (C) performs the first and second actions. In the first action, the refrigerant compressed by the compressor (81) dissipates heat in the first radiator (18A). As a result, the first radiator (18A) heats the first adsorption component (15A), and carbon dioxide is released from the first adsorption component (15A). The carbon dioxide released from the first adsorption component (15A) is transported to the designated recovery unit (63) via the recovery flow path (61). Simultaneously, in the first action, the target air flows in the second space (S2) of the second housing unit (11B). As a result, carbon dioxide in the air is adsorbed by the second adsorption component (15B).

[0015] In the second operation, the refrigerant compressed by the compressor (81) dissipates heat in the second radiator (18B). As a result, the second radiator (18B) heats the second adsorption component (15B), and carbon dioxide is released from the second adsorption component (15B). The carbon dioxide released from the second adsorption component (15B) is transported to the designated recovery section (63) via the recovery flow path (61). Simultaneously, in the second operation, the target air flows in the first space (S1) of the first housing section (11A). As a result, carbon dioxide in the air is adsorbed by the first adsorption component (15A).

[0016] The third method, based on the second method, configures the refrigerant flow path switching mechanism (90) to switch between a first state where refrigerant flows to the first radiator (18A) and a second state where refrigerant flows to the second radiator (18B). The air flow path switching mechanism (30) is configured to switch between a third state where the object space containing the object air is connected to the first space (S1) and the object space is blocked from the second space (S2) and a fourth state where the object space is connected to the second space (S2) and the object space is blocked from the first space (S1). The recovery switching mechanism (64) is configured to switch between a fifth state where the first space (S1) is connected to the recovery unit (63) and a sixth state where the second space (S2) is connected to the recovery unit (63). In the first operation, the control unit (C) controls the refrigerant flow path switching mechanism (90) to the first state, the air flow path switching mechanism (30) to the fourth state, and the recovery switching mechanism (64) to the fifth state. In the second operation, the control unit (C) controls the refrigerant flow path switching mechanism (90) to the second state, the air flow path switching mechanism (30) to the third state, and the recovery switching mechanism (64) to the sixth state.

[0017] In the third mode, during the first operation, the refrigerant flow path switching mechanism (90) is in the first state, the air flow path switching mechanism (30) is in the fourth state, and the recovery switching mechanism (64) is in the fifth state. As a result, the first adsorption component (15A) is heated by the first radiator (18A) through which the refrigerant flows. Carbon dioxide detached from the first adsorption component (15A) flows from the first space (S1) to the recovery flow path (61). At the same time, carbon dioxide in the air flowing in the second space (S2) is adsorbed by the second adsorption component (15B).

[0018] In the second operation, the refrigerant flow path switching mechanism (90) enters the second state, the air flow path switching mechanism (30) enters the third state, and the recovery switching mechanism (64) enters the sixth state. As a result, the second adsorption component (15B) is heated by the second radiator (18B) through which the refrigerant flows. Carbon dioxide detached from the second adsorption component (15B) flows from the second space (S2) to the recovery flow path (61). At the same time, carbon dioxide in the air flowing in the first space (S1) is adsorbed by the first adsorption component (15A).

[0019] The fourth method, based on any one of the first to third methods, further includes a downstream flow path (24) located downstream of the first housing section (11A) and the second housing section (11B). The evaporator (36) is disposed in the downstream flow path (24).

[0020] In the fourth method, the air used for the regeneration of the first adsorption unit (15A) and the second adsorption unit (15B) flows in the downstream flow path (24). In the downstream flow path (24), the heat of this air can be transferred to the refrigerant via the evaporator (36). As a result, the heat of the air used for the regeneration of the first adsorption unit (15A) or the second adsorption unit (15B) can be recovered into the refrigerant in the refrigerant circuit (R). Therefore, this heat can be utilized for the regeneration of the first adsorption unit (15A) and the second adsorption unit (15B).

[0021] The fifth method, based on any of the first to third methods, further includes an upstream flow path (21) located upstream of the first housing section (11A) and the second housing section (11B). The evaporator (36) is disposed in the upstream flow path (21).

[0022] In the fifth method, air cooled by the evaporator (36) flows through the first adsorption unit (15A) and the second adsorption unit (15B) in the upstream flow path (21). The temperature of the air passing through the first adsorption unit (15A) and the second adsorption unit (15B) decreases, thereby increasing the adsorption efficiency of carbon dioxide in the first adsorption unit (15A) and the second adsorption unit (15B).

[0023] The sixth method, based on the fifth method, includes a control unit (C) that controls the rotational speed of the compressor (81) so that the evaporator (36) cools the air to below the dew point temperature.

[0024] In the sixth method, the air dehumidified by the evaporator (36) flows in the first adsorption component (15A) and the second adsorption component (15B). As a result, it is possible to suppress the deterioration of the first adsorption component (15A) and the second adsorption component (15B) due to the influence of moisture in the air.

[0025] The seventh method, based on any of the methods 1 through 6, has a confluence path (87) in which the refrigerant circuit (R) is connected to both the liquid-side end of the first radiator (18A) and the liquid-side end of the second radiator (18B). A pressure reducing mechanism (82) is provided in the confluence path (87).

[0026] In the seventh method, the number of pressure reducing mechanisms (82) can be reduced, thereby simplifying the refrigerant circuit (R).

[0027] The eighth method, based on any of the methods 1 through 7, includes an auxiliary radiator (73) in the refrigerant circuit (R) for heating water to generate water vapor. The carbon dioxide recovery system also includes a supply path (71) for supplying the water vapor generated by the auxiliary radiator (73) to the interior of the first space (S1) and the second space (S2).

[0028] In the eighth method, water vapor generated by the auxiliary radiator (73) can be supplied to the vicinity of the first adsorption unit (15A) and the second adsorption unit (15B) during regeneration via the supply path (71). As a result, the regeneration efficiency of carbon dioxide in the first adsorption unit (15A) and the second adsorption unit (15B) can be improved.

[0029] The ninth method is based on any of the methods 2 to 8, wherein the refrigerant circuit (R) has an auxiliary evaporator (75) configured in the recovery flow path (61).

[0030] In the ninth method, the heat from the carbon dioxide flowing in the recovery flow path (61) can be recovered into the refrigerant in the refrigerant circuit (R) via the evaporator (36). Therefore, this heat can be used for the regeneration of the first adsorption unit (15A) and the second adsorption unit (15B).

[0031] In the tenth embodiment, the carbon dioxide recovery system further includes: a first flow path (22A, 23A, 26A, 27A) capable of communicating with a first space (S1) of the first containment unit (11A); and a second flow path (22B, 23B, 26B, 27B) capable of communicating with a second space (S2) of the second containment unit (11B). The refrigerant circuit (R) has a first evaporator (36A) and a second evaporator (36B) arranged side-by-side as evaporators. The first evaporator (36A) is located in the first flow path (22A, 23A, 26A, 27A). The second evaporator (36B) is located in the second flow path (22B, 23B, 26B, 27B).

[0032] In the tenth method, when carbon dioxide in the target air is adsorbed onto the first adsorption member (15A) in the first space (S1), the refrigerant in the first evaporator (36A) can be evaporated by the air flowing in the first flow path (22A, 23A, 26A, 27A). Therefore, the heat imparted to the refrigerant by the first evaporator (36A) can be used to heat the second adsorption member (15B) by the second radiator (18B). When the second adsorption member (15B) in the second space (S2) adsorbs carbon dioxide in the target air, the refrigerant in the second evaporator (36B) can be evaporated by the air flowing in the second flow path (22B, 23B, 26B, 27B). Therefore, the heat imparted to the refrigerant by the second evaporator (36B) can be used to heat the first adsorption member (15A) by the first radiator (18A).

[0033] The 11th method, based on the 10th method, includes a recovery unit (60) comprising: a recovery flow path (61) for conveying carbon dioxide separated from the first adsorption unit (15A) and the second adsorption unit (15B) to a designated recovery section (63); and a recovery switching mechanism (64) for switching the flow of carbon dioxide in the recovery flow path (61). The carbon dioxide recovery system also includes a control unit (C). The control unit (C) controls the refrigerant flow path switching mechanism (90), the air flow path switching mechanism (30), and the recovery switching mechanism (64) to perform a first action and a second action, in which the first radiator (18A) heats the first adsorption unit (15A), and the target air flows in the second space (S2) and the second flow path (22B, 23B, 26B, 27B) in the second evaporator (36B), and flows from the first adsorption unit (15A) to the second evaporator (36B) in the second evaporator (36B). A) The separated carbon dioxide is transported to the recovery section (63) side via the recovery flow path (61). In the second operation, the second radiator (18B) heats the second adsorption component (15B). The target air flows in the first space (S1) and the first evaporator (36A) of the first flow path (22A, 23A, 26A, 27A). The carbon dioxide separated from the second adsorption component (15B) is transported to the recovery section (63) side via the recovery flow path (61).

[0034] In the 11th method, the control unit (C) performs the first and second operations. In the first operation, the refrigerant compressed by the compressor (81) dissipates heat in the first radiator (18A) and evaporates in the second evaporator (36B). In the first operation, the first radiator (18A) heats the first adsorption member (15A), and carbon dioxide is removed from the first adsorption member (15A). The carbon dioxide removed from the first adsorption member (15A) is transported to the designated recovery unit (63) via the recovery flow path (61). At the same time, in the first operation, the target air flows in the second space (S2) and the second flow path (22B, 23B, 26B, 27B) of the second housing (11B). As a result, carbon dioxide in the air is adsorbed by the second adsorption member (15B). In the second evaporator (36B) of the second flow path (22B, 23B, 26B, 27B), the heat of the target air is transferred to the refrigerant.

[0035] In the second operation, the refrigerant compressed by the compressor (81) dissipates heat in the second radiator (18B) and evaporates in the first evaporator (36A). In the second operation, the second radiator (18B) heats the second adsorption unit (15B), and carbon dioxide is released from the second adsorption unit (15B). The carbon dioxide released from the second adsorption unit (15B) is transported to the designated recovery section (63) via the recovery flow path (61). Simultaneously, in the second operation, the target air flows between the first space (S1) of the first housing section (11A) and the second flow path (22B, 23B, 26B, 27B). As a result, carbon dioxide in the air is adsorbed by the first adsorption unit (15A). In the first evaporator (36A) of the first flow path (22A, 23A, 26A, 27A), the heat of the target air is transferred to the refrigerant.

[0036] The 12th method, based on the 11th method, has a refrigerant flow path switching mechanism (90) configured to switch between a first state in which the refrigerant flows to the first radiator (18A) and the second evaporator (36B) and a second state in which the refrigerant flows to the second radiator (18B) and the first evaporator (36A). The airflow path switching mechanism (30) is configured to switch between a third state in which the first space (S1) is connected to the object space containing the object air and the first flow path (22A, 23A, 26A, 27A) and the second space (S2) is blocked from the object space and the second flow path (22B, 23B, 26B, 27B) and the fourth state in which the second space (S2) is connected to the object space and the second flow path (22B, 23B, 26B, 27B) and the first space (S1) is blocked from the object space and the first flow path (22A, 23A, 26A, 27A). The recycling switching mechanism (64) is configured to switch between a fifth state in which the first space (S1) is connected to the recycling unit (63) and a sixth state in which the second space (S2) is connected to the recycling unit (63). In the first operation, the control unit (C) controls the refrigerant flow path switching mechanism (90) to the first state, the air flow path switching mechanism (30) to the fourth state, and the recovery switching mechanism (64) to the fifth state. In the second operation, the control unit (C) controls the refrigerant flow path switching mechanism (90) to the second state, the air flow path switching mechanism (30) to the third state, and the recovery switching mechanism (64) to the sixth state.

[0037] In the 12th mode, during the first operation, the refrigerant flow path switching mechanism (90) is in the first state, the air flow path switching mechanism (30) is in the fourth state, and the recovery switching mechanism (64) is in the fifth state. As a result, the first adsorption component (15A) is heated by the first radiator (18A) through which the refrigerant flows, and the heat of the target air in the second evaporator (36B) of the second flow path (22B, 23B, 26B, 27B) is transferred to the refrigerant. Carbon dioxide detached from the first adsorption component (15A) flows from the first space (S1) to the recovery flow path (61). At the same time, carbon dioxide in the air flowing in the second space (S2) is adsorbed by the second adsorption component (15B).

[0038] In the second operation, the refrigerant flow path switching mechanism (90) enters the second state, the air flow path switching mechanism (30) enters the third state, and the recovery switching mechanism (64) enters the sixth state. As a result, the second adsorption component (15B) is heated by the second radiator (18B) through which the refrigerant flows, and the heat of the target air in the first evaporator (36A) of the first flow path (22A, 23A, 26A, 27A) is transferred to the refrigerant. Carbon dioxide detached from the second adsorption component (15B) flows from the second space (S2) to the recovery flow path (61). At the same time, carbon dioxide in the air flowing in the first space (S1) is adsorbed by the first adsorption component (15A).

[0039] In the 13th method, based on any of the 10th to 12th methods, the first flow path (23A, 27A) is located downstream of the first space (S1). The first flow path (23B, 27B) is located downstream of the second space (S2).

[0040] In the 13th embodiment, the air used for regeneration of the first adsorption unit (15A) flows from the first space (S1) through the first flow path (23A, 27A). Alternatively, the air used for regeneration of the second adsorption unit (15B) flows from the second space (S2) through the second flow path (23B, 27B). Therefore, the heat from the air used for regeneration of the first adsorption unit (15A) and the second adsorption unit (15B) can be recovered into the refrigerant in the refrigerant circuit (R) via the first evaporator (36A) and the second evaporator (36B). Thus, this heat can be utilized for the regeneration of the first adsorption unit (15A) and the second adsorption unit (15B).

[0041] In the 14th method, based on any of the 10th to 12th methods, the first flow path (22A, 26A) is located upstream of the first space (S1). The second flow path (22B, 26B) is located upstream of the second space (S2). Therefore, air cooled by the first evaporator (36A) of the first flow path (22A, 26A) flows in the first adsorption unit (15A). Alternatively, air cooled by the second evaporator (36B) of the second flow path (22B, 26B) flows in the second adsorption unit (15B). The temperature of the air passing through the first adsorption unit (15A) and the second adsorption unit (15B) decreases, thereby increasing the adsorption efficiency of carbon dioxide in the first adsorption unit (15A) and the second adsorption unit (15B). Attached Figure Description

[0042] Figure 1 This is a diagram showing the overall structure of a carbon dioxide recovery system.

[0043] Figure 2 This is a piping system diagram of a refrigeration cycle unit.

[0044] Figure 3 This is a block diagram of the main equipment.

[0045] Figure 4 It is a timing diagram showing the operation of each adsorption unit.

[0046] Figure 5 It is used to explain the first operation and Figure 1 The corresponding diagram.

[0047] Figure 6 It is used to explain the second operation and Figure 1 The corresponding diagram.

[0048] Figure 7 This is a schematic diagram of the overall structure of the carbon dioxide recovery system in Modified Example 1.

[0049] Figure 8 This is a piping system diagram of the refrigeration cycle device in variation 1.

[0050] Figure 9 This is a timing diagram showing the operation of each adsorption unit in Modified Example 1.

[0051] Figure 10 This is a schematic diagram of the overall structure of the carbon dioxide recovery system in Modified Example 2.

[0052] Figure 11 This is a schematic diagram of the overall structure of the carbon dioxide recovery system in Modified Example 3.

[0053] Figure 12 This is a piping system diagram of the refrigeration cycle device in variation example 3.

[0054] Figure 13 This is a schematic diagram of the overall structure of the carbon dioxide recovery system in Modified Example 4.

[0055] Figure 14 This is a schematic diagram of the overall structure of the carbon dioxide recovery system in Modified Example 5.

[0056] Figure 15 This is a piping system diagram of the refrigeration cycle device in variation 5.

[0057] Figure 16 This is a schematic diagram of the overall structure of the carbon dioxide recovery system in Modified Example 6. Detailed Implementation

[0058] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that this disclosure is not limited to the embodiments shown below, and various modifications can be made without departing from the technical concept of this disclosure. The accompanying drawings are for conceptual illustration of this disclosure; therefore, for ease of understanding, dimensions, ratios, or quantities may sometimes be exaggerated or simplified as needed.

[0059] (1) Overall composition

[0060] The embodiment of this disclosure is a carbon dioxide recovery system (1). The carbon dioxide recovery system (1) of this example recovers carbon dioxide from the air. The carbon dioxide recovery system (1) of this example constitutes a DAC (Direct Air Capture) system that directly separates and recovers carbon dioxide from outdoor air.

[0061] Figure 1 The carbon dioxide recovery system (1) shown includes an adsorption device (10), a recovery unit (60), a water vapor supply unit (70), and a controller (C). For example... Figure 2 As shown, the carbon dioxide recovery system (1) includes a refrigeration cycle device (80) with a refrigerant circuit (R).

[0062] The adsorption device (10) has multiple adsorption units (U1, U2). Each adsorption unit (U1, U2) has adsorption components (15A, 15B). Each adsorption unit (U1, U2) performs an adsorption action to adsorb carbon dioxide from outdoor air onto the adsorption components (15A, 15B) and a regeneration action to regenerate / remove the carbon dioxide adsorbed on the adsorption components (15A, 15B).

[0063] The recovery unit (60) is a device for recovering carbon dioxide that has escaped from the adsorption components (15A, 15B). The steam supply unit (70) is a device for supplying steam to the adsorption components (15A, 15B) during regeneration. The refrigeration cycle device (80) is a heat source for heating / regenerating the adsorption components (15A, 15B). Figure 3 The controller (C) shown controls the adsorption device (10), the recovery unit (60), the steam supply unit (70), and the refrigeration cycle device (80).

[0064] (2) Adsorption device

[0065] The adsorption device (10) has a first adsorption unit (U1) and a second adsorption unit (U2) as multiple adsorption units. The number of multiple adsorption units (U1, U2) is only one example, and in detail, there may be more than three units, as described later. The first adsorption unit (U1) has a first housing (11A), a first adsorption component (15A), and a first heat sink (18A). The second adsorption unit (U2) has a second housing (11B), a second adsorption component (15B), and a second heat sink (18B).

[0066] The adsorption device (10) has an air flow path (20), a fan (35) for conveying air through the air flow path (20), an air flow path switching mechanism (30), and an evaporator (36).

[0067] (2-1) Shell

[0068] The first shell (11A) is an example of a first receiving section, and the second shell (11B) is an example of a second receiving section. The first shell (11A) and the second shell (11B) are both hollow. A first space (S1) is formed inside the first shell (11A), and a second space (S2) is formed inside the second shell (11B).

[0069] In the first housing (11A), a first inlet (I1) and a first outlet (O1) are formed. The first inlet (I1) is an opening located on the upstream side of the first space (S1), and the first outlet (O1) is an opening located on the downstream side of the first space (S1). In the second housing (11B), a second inlet (I2) and a second outlet (O2) are formed. The second inlet (I2) is an opening located on the upstream side of the second space (S2), and the second outlet (O2) is an opening located on the downstream side of the second space (S2).

[0070] (2-2) Adsorption component

[0071] The first adsorption component (15A) is disposed in the first space (S1) of the first housing (11A). The second adsorption component (15B) is disposed in the second space (S2) of the second housing (11B).

[0072] Each adsorption component (15A, 15B) has a substrate that allows air circulation and an adsorbent loaded on the substrate. The substrate is composed of a ceramic material with multiple pores, a metal material with multiple pores, a porous component with multiple fine pores, metal fibers, carbon fibers, etc. The thermal conductivity of the substrate is preferably 1 [W / (m·K)] or higher.

[0073] Adsorbents have the property of adsorbing carbon dioxide. Adsorbents are, for example, amine-based substances. Adsorbents have the following characteristics: the higher the temperature, the easier it is for carbon dioxide to detach; the lower the temperature, the easier it is for carbon dioxide to be adsorbed. The term "adsorption" here includes not only the adsorption of carbon dioxide onto the surface of a solid or liquid, but also its absorption within the solid or liquid. Furthermore, "adsorption" includes not only physical adsorption but also chemical adsorption. The adsorbent (60) is composed of a liquid membrane.

[0074] (2-3) Radiator

[0075] A first radiator (18A) is disposed in a first space (S1) of a first housing (11A). The first radiator (18A) is disposed close to a first adsorption component (15A). The first adsorption component (15A) is in contact with the first radiator (18A). The first radiator (18A) heats the first adsorption component (15A) by refrigerant flowing inside it. A second radiator (18B) is disposed close to a second adsorption component (15B). The second adsorption component (15B) is in contact with the second radiator (18B). The second radiator (18B) heats the second adsorption component (15B) by refrigerant flowing inside it.

[0076] (2-4) Airflow path

[0077] The airflow path (20) is, for example, a flow path consisting of pipes. The airflow path (20) includes an intake pipe (21), a first inflow side branch pipe (22A), a second inflow side branch pipe (22B), a first outflow side branch pipe (23A), a second outflow side branch pipe (23B), and an exhaust pipe (24).

[0078] One end (inflow end) of the suction pipe (21) is connected to the outdoor space. The other end (outflow end) of the suction pipe (21) is connected to one end (inflow end) of the first inflow-side branch pipe (22A) and one end (inflow end) of the second inflow-side branch pipe (22B). The other end (outflow end) of the first inflow-side branch pipe (22A) is connected to the first inlet (I1). The other end (outflow end) of the second inflow-side branch pipe (22B) is connected to the second inlet (I2). One end (inflow end) of the first outflow-side branch pipe (23A) is connected to the first outlet (O1). One end (inflow end) of the second outflow-side branch pipe (23B) is connected to the second outlet (O2). The other ends (outflow ends) of the first outflow-side branch pipe (23A) and the second outflow-side branch pipe (23B) are connected to one end (inflow end) of the discharge pipe (24). The other end (outlet end) of the discharge pipe (24) is connected to the outdoor space. The suction pipe (21) is an example of an upstream flow path. The discharge pipe (24) is an example of a downstream flow path.

[0079] (2-5) Fan

[0080] The fan (35) is located inside the discharge duct (24). The fan (35) may be, for example, a propeller fan. The fan (35) may also be located in the intake duct (21).

[0081] (2-6) Airflow path switching mechanism

[0082] The airflow path switching mechanism (30) switches the airflow between the first space (S1) and the second space (S2). The airflow path switching mechanism (30) is configured to switch between a third state in which the object space (outdoor space) containing outdoor air as the object air is connected to the first space (S1) and the outdoor space is blocked from the second space (S2), and a fourth state in which the outdoor space is connected to the second space (S2) and the airflow path (20) is blocked from the first space (S1).

[0083] Specifically, the airflow path switching mechanism (30) has a first inflow side damper (31), a first outflow side damper (32), a second inflow side damper (33), and a second outflow side damper (34). The first inflow side damper (31) and the first outflow side damper (32) are disposed in the first adsorption unit (U1). The second inflow side damper (33) and the second outflow side damper (34) are disposed in the second adsorption unit (U2).

[0084] The first inflow side damper (31) opens and closes the first flow inlet (I1). The second inflow side damper (33) opens and closes the second flow inlet (I2). The first outflow side damper (32) opens and closes the first flow outlet (O1). The second outflow side damper (34) opens and closes the second flow outlet (O2). Figure 1 Solid lines represent open dampers, and dashed lines represent closed dampers.

[0085] When the airflow path switching mechanism (30) is in the third state, the first inflow side damper (31) and the first outflow side damper (32) are in the open state, and the second inflow side damper (33) and the second outflow side damper (34) are in the closed state. When the airflow path switching mechanism (30) is in the third state, the air in the airflow path (20) flows in the first space (S1), while the second space (S2) is blocked from the airflow path (20).

[0086] When the airflow path switching mechanism (30) is in the fourth state, the second inflow side damper (33) and the second outflow side damper (34) are in the open state, and the first inflow side damper (31) and the first outflow side damper (32) are in the closed state. When the airflow path switching mechanism (30) is in the fourth state, the air in the airflow path (20) flows in the second space (S2), while the first space (S1) is blocked from the airflow path (20).

[0087] (2-7) Evaporator

[0088] In this embodiment, the evaporator (36) is disposed within the discharge pipe (24). The evaporator (36) is located downstream of the first adsorption unit (U1) and the second adsorption unit (U2) in the air flow path (20). The evaporator (36) allows the refrigerant flowing inside it to exchange heat with the air flowing in the discharge pipe (24). The evaporator (36) recovers the residual heat of the air discharged to the outside as the heat of vaporization of the refrigerant.

[0089] (3) Recycling Unit

[0090] The recovery unit (60) selectively recovers carbon dioxide that has escaped from the first adsorption unit (15A) and the second adsorption unit (15B). The recovery unit (60) has a recovery flow path (61), a pump (62), and a recovery tank (63) as a recovery section.

[0091] The recovery flow path (61) is a flow path used to transport carbon dioxide separated from the first adsorption unit (15A) and the second adsorption unit (15B) 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 (inflow end) of the first suction path (61a) is connected to the first housing (11A) and communicates with the first space (S1). One end (inflow end) of the second suction path (61b) is connected to the second housing (11B) and communicates with the second space (S2). One end (inflow end) of the recovery flow path (61) is connected to the other end (outflow end) of the first suction path (61a) and the other end (outflow end) of the second suction path (61b). The other end (outflow end) of the main flow path (61c) is connected to the recovery tank (63).

[0092] A pump (62) is installed in the recovery flow path (61). The pump (62) delivers carbon dioxide from the recovery flow path (61). The pump (62) also serves as a pressure reducing device for the first space (S1) and the second space (S2). The recovery tank (63) is a storage container for storing the carbon dioxide flowing out of the recovery flow path (61).

[0093] The recovery unit (60) has a recovery switching mechanism (64) for switching the flow of carbon dioxide in the recovery flow path (61). The recovery switching mechanism (64) is configured to switch between a fifth state that connects the first space (S1) to the recovery tank (63) side (the outflow side of the recovery flow path (61)) and a sixth state that connects the second space (S2) to the recovery tank (63) side (the outflow side of the recovery flow path (61)).

[0094] The recycling switching mechanism (64) has a first recycling valve (64a) and a second recycling valve (64b). The first recycling valve (64a) is located in the first suction path (61a). The second recycling valve (64b) is located in the second suction path (61b). The first recycling valve (64a) and the second recycling valve (64b) are composed of on / off valves such as solenoid valves, but they can also be flow regulating valves. When the recycling switching mechanism (64) is in the fifth state, the first recycling valve (64a) is in the open state and the second recycling valve (64b) is in the closed state. When the recycling switching mechanism (64) is in the sixth state, the second recycling valve (64b) is in the open state and the first recycling valve (64a) is in the closed state.

[0095] (4) Steam supply unit

[0096] The steam supply unit (70) supplies the generated steam to the adsorption units (U1, U2) in the regeneration operation. The steam supply unit (70) has a supply path (71), a generation tank (72), and an auxiliary radiator (73).

[0097] The supply path (71) has a first inlet path (71a), a second inlet path (71b), and a main supply path (71c). One end (inflow end) of the main supply path (71c) is connected to the top of the generating tank (72). One end (inflow end) of the first inlet path (71a) and one end (inflow end) of the second inlet path (71b) are connected to the other end (outflow end) of the main supply path (71c). The other end (outflow end) of the first inlet path (71a) is connected to the first housing (11A) and communicates with the first space (S1). The other end (outflow end) of the second inlet path (71b) is connected to the second housing (11B) and communicates with the second space (S2).

[0098] A first inlet valve (74a) is provided on the first inlet passage (71a), and a second inlet valve (74b) is provided on the second inlet passage (71b). The first inlet valve (74a) and the second inlet valve (74b) are composed of on-off valves such as solenoid valves, but they can also be flow regulating valves.

[0099] The generating tank (72) is a container used to generate water vapor. Water from a specified water source is supplied into the generating tank (72). An auxiliary radiator (73) is disposed inside the generating tank (72). The auxiliary radiator (73) generates water vapor by heating the water in the generating tank (72). The water vapor generated in the generating tank (72) is supplied to the adsorption units (U1, U2) in the regeneration operation via the supply path (71).

[0100] (5) Refrigeration cycle device

[0101] like Figure 2 As shown, the refrigeration cycle device (80) has a refrigerant circuit (R) filled with refrigerant. The refrigerant circuit (R) performs a refrigeration cycle by circulating the refrigerant. The refrigerant circuit (R) has a compressor (81), a first radiator (18A), a second radiator (18B), an auxiliary radiator (73), an expansion valve (82), and an evaporator (36).

[0102] The compressor (81) compresses the intake refrigerant and discharges the compressed refrigerant. The first radiator (18A) and the second radiator (18B) are arranged side-by-side in the refrigerant circuit (R). In this embodiment, the auxiliary radiator (73) is arranged side-by-side with the first radiator (18A) and the second radiator (18B) 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) arranged side-by-side. The first radiator (18A) is located in the first high-pressure flow path (85a), the second radiator (18B) is located in the second high-pressure flow path (85b), and the auxiliary radiator (73) is located in the auxiliary high-pressure flow path (86). The auxiliary radiator (73) may also be arranged in series with the first radiator (18A) and the second radiator (18B) in the refrigerant circuit (R).

[0103] The refrigerant circuit (R) has a confluence path (87) connected to the liquid side end of the first radiator (18A) and the liquid side end of the second radiator (18B). The confluence path (87) is a liquid line connected to 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 confluence path (87). The expansion valve (82) is an example of a pressure reducing mechanism, for example, an electronic expansion valve. An evaporator (36) is provided between the expansion valve (82) in the refrigerant circuit (R) and the suction section of the compressor (81). An auxiliary on / off valve (91) is provided in the third high-pressure flow path (85c). The auxiliary on / off valve (91) is a solenoid on / off valve, but it can also be a flow regulating valve.

[0104] The refrigerant circuit (R) has a refrigerant flow path switching mechanism (90) that switches the flow of refrigerant. The refrigerant flow path switching mechanism (90) is configured to switch between a first state in which the refrigerant flows to the first radiator (18A) and a second state in which the refrigerant flows to the second radiator (18B).

[0105] The refrigerant flow path switching mechanism (90) has a first on / off valve (90a) and a second on / off valve (90b). The first on / off valve (90a) is located in the first high-pressure flow path (85a). The second on / off valve (90b) is located in the second high-pressure flow path (85b). The first on / off valve (90a) and the second on / off valve (90b) are electromagnetic on / off valves, but they can also be flow regulating valves. When the refrigerant flow path switching mechanism (90) is in the first state, the first on / off valve (90a) is in the open state and the second on / off valve (90b) is in the closed state. When the refrigerant flow path switching mechanism (90) is in the second state, the second on / off valve (90b) is in the open state and the first on / off valve (90a) is in the closed state.

[0106] (6) Controller

[0107] Figure 3 The controller (C) shown includes a microcomputer and a storage device for storing software used to operate the microcomputer.

[0108] The controller (C) controls the opening and closing states of each damper (31, 32, 33, 34), the ON / OFF state of the fan (35), the ON / OFF state of the pump (62), the opening and closing states of each recovery valve (64a, 64b), the opening and closing states of each inlet valve (74a, 74b), the ON / OFF state of the compressor (81), the opening degree of the expansion valve (82), and the opening and closing states of each on / off valve (90a, 90b). The controller (C) controls the speed of the compressor (81). The controller (C) can also control the speed of the fan (35) and the pump (62).

[0109] (7) Operational movements

[0110] The operation of the carbon dioxide recovery system (1) is explained. For example... Figure 4 As shown, the carbon dioxide recovery system (1) alternately performs a first operation and a second operation. The first operation is an example of the first action. In the first operation, while the first adsorption unit (U1) is regenerating, the second adsorption unit (U2) is adsorbing. The second operation is an example of the second action. In the second operation, while the first adsorption unit (U1) is adsorbing, the second adsorption unit (U2) is regenerating.

[0111] In other words, the first adsorption unit (U1) alternates between regeneration and adsorption operations. The second adsorption unit (U2) alternates between regeneration and adsorption operations. In this example, the execution time T1 of the regeneration operation performed by each adsorption unit (U1, U2) is the same as the execution time T2 of the adsorption operation performed by each adsorption unit (U1, U2).

[0112] The controller (C) operates the fan (35), pump (62), and compressor (81) during the first and second operations. The controller (C) also adjusts the opening of the expansion valve (82) appropriately during the first and second operations.

[0113] (7-1) First Operation

[0114] exist Figure 5In the first operation shown, the controller (C) controls the refrigerant flow path switching mechanism (90), the air flow path switching mechanism (30), and the recovery switching mechanism (64) so ​​that the first radiator (18A) heats the first adsorption component (15A), air in the air flow path (20) flows in the second space (S2), and carbon dioxide released from the first adsorption component (15A) is transported to the recovery tank (63) via the recovery flow path (61). Specifically, in the first operation, the controller (C) sets the refrigerant flow path switching mechanism (90) to the first state, the air flow path switching mechanism (30) to the fourth state, and the recovery switching mechanism (64) to the fifth state. More specifically, in the first operation, the controller (C) closes the first inflow side damper (31) and the first outflow side damper (32), opens the second inflow side damper (33) and the second outflow side damper (34), opens the first recovery valve (64a), closes the second recovery valve (64b), opens the first inlet valve (74a), closes the second inlet valve (74b), opens the first on / off valve (90a), closes the second on / off valve (90b), and opens the auxiliary on / off valve (91).

[0115] exist Figure 2 In the refrigerant circuit (R) shown, the refrigerant compressed by the compressor (81) is split into the first high-pressure flow path (85a) and the auxiliary high-pressure flow path (86). The refrigerant in the first high-pressure flow path (85a) dissipates heat to the air in the first space (S1) as it flows through the first radiator (18A). The refrigerant in the auxiliary high-pressure flow path (86) dissipates heat to the water around it as it flows through the auxiliary radiator (73). The refrigerant that has passed through the first high-pressure flow path (85a) and the auxiliary high-pressure flow path (86) merges in the confluence path (87) and is then depressurized by the expansion valve (82). The depressurized refrigerant absorbs heat from the surrounding air and evaporates as it flows in the evaporator (36). The refrigerant evaporated in the evaporator (36) is drawn into the compressor (81) and compressed again.

[0116] In the first operation, outdoor air from the outdoor space flows sequentially through the intake pipe (21) and the second inflow-side branch pipe (22B) into the second space (S2) of the second housing (11B). In the second space (S2), carbon dioxide in the air is adsorbed by the second adsorption component (15B). The air that has passed through the second adsorption component (15B) flows sequentially through the second outflow-side branch pipe (23B) and the discharge pipe (24). In the evaporator (36) within the discharge pipe (24), the air exchanges heat with the refrigerant, and the heat of the air is recovered as the heat of vaporization of the refrigerant. The air in the discharge pipe (24) is discharged into the outdoor space.

[0117] In the first operation, the first radiator (18A) heats the first adsorption component (15A). As a result, carbon dioxide is removed from the first adsorption component (15A). When the pump (62) operates, the first space (S1) becomes negative pressure. As a result, the removal of carbon dioxide from the first adsorption component (15A) is promoted.

[0118] In the generating tank (72), water heated by the auxiliary radiator (73) becomes water vapor. The water vapor generated in the generating tank (72) flows into the first space (S1) via the supply path (71). By supplying water vapor to the vicinity of the first adsorption component (15A), the removal of carbon dioxide from the first adsorption component (15A) is promoted.

[0119] Carbon dioxide detached from the first adsorption unit (15A) is sent to the recovery tank (63) via the recovery flow path (61). The carbon dioxide is stored in the recovery tank (63).

[0120] (7-2) Second rotation

[0121] exist Figure 6 In the second operation shown, the controller (C) controls the refrigerant flow path switching mechanism (90), the air flow path switching mechanism (30), and the recovery switching mechanism (64) so ​​that the second radiator (18B) heats the second adsorption component (15B), air in the air flow path (20) flows in the first space S1, and carbon dioxide released from the second adsorption component (15B) is transported to the recovery tank (63) via the recovery flow path (61). Specifically, in the second operation, the controller (C) sets the refrigerant flow path switching mechanism (90) to the second state, the air flow path switching mechanism (30) to the fifth state, and the recovery switching mechanism (64) to the sixth state. More specifically, in the second operation, the controller (C) opens the first inflow side damper (31) and the first outflow side damper (32), closes the second inflow side damper (33) and the second outflow side damper (34), closes the first recovery valve (64a), opens the second recovery valve (64b), closes the first inlet valve (74a), opens the second inlet valve (74b), closes the first on / off valve (90a), opens the second on / off valve (90b), and opens the auxiliary on / off valve (91).

[0122] exist Figure 2In the refrigerant circuit (R) shown, the refrigerant compressed by the compressor (81) is split into the second high-pressure flow path (85b) and the auxiliary high-pressure flow path (86). The refrigerant in the second high-pressure flow path (85b) dissipates heat to the air in the second space (S2) as it flows through the second radiator (18B). The refrigerant in the auxiliary high-pressure flow path (86) dissipates heat to the water around it as it flows through the auxiliary radiator (73). The refrigerant that has passed through the second high-pressure flow path (85b) and the auxiliary high-pressure flow path (86) merges in the confluence path (87) and is then depressurized by the expansion valve (82). The depressurized refrigerant absorbs heat from the surrounding air and evaporates as it flows in the evaporator (36). The refrigerant evaporated in the evaporator (36) is drawn into the compressor (81) and compressed again.

[0123] In the second operation, outdoor air from the outdoor space flows sequentially through the intake pipe (21) and the first inflow-side branch pipe (22A) into the first space (S1) of the first housing (11A). In the first space (S1), carbon dioxide in the air is adsorbed by the first adsorption component (15A). The air that has passed through the first adsorption component (15A) flows sequentially through the first outflow-side branch pipe (23A) and the discharge pipe (24). In the evaporator (36) inside the discharge pipe (24), the air exchanges heat with the refrigerant, and the heat of the air is recovered as the heat of vaporization of the refrigerant. The air in the discharge pipe (24) is discharged into the outdoor space.

[0124] In the second operation, the second radiator (18B) heats the second adsorption component (15B). As a result, carbon dioxide is removed from the second adsorption component (15B). When the pump (62) operates, the second space (S2) becomes negative pressure. As a result, the removal of carbon dioxide from the second adsorption component (15B) is promoted.

[0125] In the generating tank (72), water heated by the auxiliary radiator (73) becomes water vapor. The water vapor generated in the generating tank (72) flows into the second space (S2) via the supply path (71). By supplying water vapor to the vicinity of the second adsorption component (15B), the removal of carbon dioxide from the second adsorption component (15B) is promoted.

[0126] Carbon dioxide detached from the second adsorption unit (15B) is sent to the recovery tank (63) via the recovery flow path (61). The carbon dioxide is stored in the recovery tank (63).

[0127] (8) Features

[0128] (8-1)

[0129] The carbon dioxide recovery system (1) has a refrigerant circuit (R) for performing a refrigeration cycle, the refrigerant circuit (R) having a compressor (81), a first radiator (18A) and a second radiator (18B) arranged side by side, an expansion valve (82), an evaporator (36), and a refrigerant flow path switching mechanism (90) for switching the flow of refrigerant between the first radiator (18A) and the second radiator (18B). The carbon dioxide recovery system (1) includes: a first housing section (11A) having a first space (S1) in which a first adsorption component (15A) and a first radiator (18A) are disposed; a second housing section (11B) having a second space (S2) in which a second adsorption component (15B) and a second radiator (18B) are disposed; an airflow switching mechanism (30) for switching the airflow between the first space (S1) and the second space (S2); and a recovery unit (60) for selectively recovering carbon dioxide that has escaped from the first adsorption component (15A) and the second adsorption component (15B).

[0130] In this configuration, the refrigerant flow path switching mechanism (90) selectively directs the refrigerant to either the first radiator (18A) or the second radiator (18B). The air flow path switching mechanism (30) selectively directs outdoor air to either the first space (S1) or the second space (S2). This enables the following actions: simultaneously adsorbing carbon dioxide from outdoor air onto the first adsorption component (15A) in the first space (S1) and heating / regenerating the second adsorption component (15B) using the second radiator (18B); and simultaneously adsorbing carbon dioxide from outdoor air onto the second adsorption component (15B) in the second space (S2) and heating / regenerating the first adsorption component (15A) using the first radiator (18A). Carbon dioxide detached from the first adsorption component (15A) and the second adsorption component (15B) is recovered by the recovery unit (60).

[0131] In this configuration, a refrigerant circuit (R) that performs a refrigeration cycle is used as the heat source for heating / regenerating the first adsorption unit (15A) and the second adsorption unit (15B). Therefore, energy consumption efficiency can be improved compared to heat sources such as heaters.

[0132] (8-2)

[0133] The carbon dioxide recovery system (1) also includes a controller (C) that controls the refrigerant flow path switching mechanism (90), the air flow path switching mechanism (30), and the recovery switching mechanism (64) to perform a first action and a second action. In the first action, the first radiator (18A) heats the first adsorption component (15A), outdoor air flows in the second space (S2) of the second housing (11B), and carbon dioxide released from the first adsorption component (15A) is transported to the recovery tank (63) side via the recovery flow path (61). In the second action, the second radiator (18B) heats the second adsorption component (15B), outdoor air flows in the first space (S1) of the first housing (11A), and carbon dioxide released from the second adsorption component (15B) is transported to the recovery tank (63) side via the recovery flow path (61).

[0134] In this configuration, the first and second actions can be performed by the controller (C). Preferably, the controller (C) continuously operates the compressor (81) while switching the refrigerant flow between the first radiator (18A) and the second radiator (18B) via the refrigerant flow path switching mechanism (90). This reduces the number of times the compressor (81) starts and stops, improving energy efficiency. Reducing the number of times the compressor (81) starts and stops also extends the lifespan of the compressor (81).

[0135] (8-3)

[0136] The evaporator (36) of the refrigerant circuit (R) is located within the discharge pipe (24), which serves as the downstream flow path. During the first and second operations, air that has just undergone regeneration and passed through the adsorption components (15A, 15B) passes through the evaporator (36). Therefore, relatively hot air flows within the evaporator (36). This high-temperature air can be used as the heat of vaporization for the refrigerant flowing within the evaporator (36). In other words, the heat of this air can be recovered into the refrigerant in the refrigerant circuit (R) via the evaporator (36), and can be used as heat for the regeneration of the adsorption components (15A, 15B) during the regeneration operation. As a result, energy consumption efficiency can be further improved.

[0137] (8-4)

[0138] The refrigerant circuit (R) has a confluence path (87) connecting the liquid side end of the first radiator (18A) and the liquid side end of the second radiator (18B). An expansion valve (82) serving as a pressure reducing mechanism is provided in the confluence path (87).

[0139] In this configuration, the refrigerant pressure can be reduced by providing only one expansion valve (82) in the confluence path (87). Therefore, compared with the configuration in which expansion valves are provided in the first high-pressure flow path (85a) and the second high-pressure flow path (85b) respectively, the number of expansion valves (82) can be reduced. Thus, the configuration of the refrigerant circuit (R) can be simplified.

[0140] (8-5)

[0141] The refrigerant circuit (R) has an auxiliary radiator (73) for heating water to generate water vapor. The carbon dioxide recovery system (1) also has a supply path (71) for supplying the water vapor generated by the auxiliary radiator (73) to the first space (S1) and the second space (S2) of the first housing (11A). The controller (C) controls the first inlet valve (74a) and the second inlet valve (74b) as supply switching mechanisms, so that water vapor generated by the auxiliary radiator (73) is supplied to the first space (S1) in the first operation and to the second space (S2) in the second operation.

[0142] In this configuration, water vapor can be supplied to the adsorption components (15A, 15B) during the regeneration process, thereby improving the regeneration efficiency of the adsorption components (15A, 15B).

[0143] Furthermore, the refrigerant circuit (R) is used not only as a heat source for the regeneration of the adsorption components (15A, 15B), but also as a heat source for generating water vapor. Therefore, the carbon dioxide recovery system (1) can be simplified.

[0144] (9) Variations

[0145] The above embodiments can also be configured as follows. It should be noted that, in the following description, the differences from the embodiments described above will be explained in principle.

[0146] (9-1) Variation Example 1

[0147] As mentioned above, the number of adsorption units (U1, U2) is not limited to two, but can also be three or more. Figure 7The carbon dioxide recovery system (1) of the modified example 1 shown has a third adsorption unit (U3). The third adsorption unit (U3) has a third housing (11C) forming a third space (S3), a third adsorption component (15C) disposed in the third space (S3), and a third radiator (18C). A third inlet (I3) and a third outlet (O3) are formed in the third housing (11C). The air flow path (20) has a third inlet-side branch pipe (22C) and a third outlet-side branch pipe (23C). The air flow path switching mechanism (30) has a third inlet-side damper (37) for opening and closing the third inlet (I3) and a third outlet-side damper (38) for opening and closing the third outlet (O3). The recovery flow path (61) has a third suction path (61d). The recovery switching mechanism (64) has a third recovery valve (64c). The supply path (71) has a third inlet path (71d). A third inlet valve (74c) is provided in the third inlet channel (71d).

[0148] like Figure 8 As shown, the refrigerant circuit (R) has a third high-pressure flow path (85c). The refrigerant flow path switching mechanism (90) has a third on / off valve (90c) provided in the third high-pressure flow path (85c).

[0149] like Figure 9 As shown, the carbon dioxide recovery system (1) sequentially performs the first operation, the second operation, and the third operation. The first operation involves the second adsorption unit (U2) and the third adsorption unit (U3) performing adsorption operations simultaneously with the regeneration of the first adsorption unit (U1). The second operation involves the second adsorption unit (U2) performing adsorption operations simultaneously with the regeneration of the first adsorption unit (U1) and the third adsorption unit (U3). The third operation involves the third adsorption unit (U3) performing regeneration operations simultaneously with the adsorption of the first adsorption unit (U1) and the second adsorption unit (U2). The first operation is an example of the first operation, and the second operation is an example of the second operation.

[0150] The first adsorption unit (U1), the second adsorption unit (U2), and the third adsorption unit (U3) alternately perform regeneration and adsorption actions. The execution time T1 of the regeneration action performed by each adsorption unit (U1, U2) is shorter than the execution time T2 of the adsorption action performed by each adsorption unit (U1, U2, U3).

[0151] In the first operation, the controller (C) controls the refrigerant flow path switching mechanism (90), the air flow path switching mechanism (30), and the recovery switching mechanism (64) so ​​that the first radiator (18A) heats the first adsorption component (15A), the air in the air flow path (20) flows in the second space (S2) and the third space (S3), and the carbon dioxide that has been removed from the first adsorption component (15A) is transported to the recovery tank (63) via the recovery flow path (61). Specifically, in the first operation, the controller (C) closes the first inflow side damper (31) and the first outflow side damper (32), opens the second inflow side damper (33), the second outflow side damper (34), the third inflow side damper (37), and the third outflow side damper (38), opens the first recovery valve (64a), closes the second recovery valve (64b) and the third recovery valve (64c), opens the first inlet valve (74a), closes the second inlet valve (74b) and the third inlet valve (74c), opens the first on / off valve (90a), closes the second on / off valve (90b) and the third on / off valve (90c), and opens the auxiliary on / off valve (91).

[0152] In the second operation, the controller (C) controls the refrigerant flow path switching mechanism (90), the air flow path switching mechanism (30), and the recovery switching mechanism (64) so ​​that the second radiator (18B) heats the second adsorption component (15B), the air in the air flow path (20) flows in the first space (S1) and the third space (S3), and the carbon dioxide that has been removed from the second adsorption component (15B) is transported to the recovery tank (63) via the recovery flow path (61). Specifically, in the second operation, the controller (C) closes the second inflow side damper (33) and the second outflow side damper (34), opens the first inflow side damper (31), the first outflow side damper (32), the third inflow side damper (37), and the third outflow side damper (38), opens the second recovery valve (64b), closes the first recovery valve (64a) and the third recovery valve (64c), opens the second inlet valve (74b), closes the first inlet valve (74a) and the third inlet valve (74c), opens the second on / off valve (90b), closes the first on / off valve (90a) and the third on / off valve (90c), and opens the auxiliary on / off valve (91).

[0153] In the third operation, the controller (C) controls the refrigerant flow path switching mechanism (90), the air flow path switching mechanism (30), and the recovery switching mechanism (64) so ​​that the third radiator (18C) heats the third adsorption component (15C), the air in the air flow path (20) flows in the first space (S1) and the second space (S2), and the carbon dioxide that has been removed from the third adsorption component (15C) is transported to the recovery tank (63) via the recovery flow path (61). Specifically, in the third operation, the controller (C) closes the third inflow side damper (37) and the third outflow side damper (38), opens the first inflow side damper (31), the first outflow side damper (32), the second inflow side damper (33) and the second outflow side damper (34), opens the third recovery valve (64c), closes the first recovery valve (64a) and the second recovery valve (64b), opens the third inlet valve (74c), closes the first inlet valve (74a) and the second inlet valve (74b), opens the third on / off valve (90c), closes the first on / off valve (90a) and the second on / off valve (90b), and opens the auxiliary on / off valve (91).

[0154] The specific airflow and refrigerant flow are the same as in the above-described embodiment, so their description is omitted. Similarly, the number of adsorption units (U1, U2) can be four or more.

[0155] (9-2) Variation Example 2

[0156] exist Figure 10 In the modified example 2 shown, the evaporator (36) of the refrigerant circuit (R) is arranged in the suction pipe (21) which serves as the upstream flow path. A temperature sensor (51) and a humidity sensor (52) are arranged in the suction pipe (21). The temperature sensor (51) detects the temperature of the air flowing upstream of the evaporator (36) in the suction pipe (21). The humidity sensor (52) detects the humidity (strictly speaking, relative humidity) of the air flowing upstream of the evaporator (36) in the suction pipe (21).

[0157] In Modification 2, during the first operation, the air cooled by the evaporator (36) passes through the second adsorption component (15B) in the second space (S2). Therefore, the temperature of the second adsorption component (15B) decreases, and its adsorption efficiency increases. Furthermore, the heat from the outdoor air is recovered by the refrigerant via the evaporator (36). Therefore, this heat can be used for the regeneration of the first adsorption component (15A).

[0158] In Modification 2, during the second operation, air cooled by the evaporator (36) passes through the first adsorption component (15A) in the first space (S1). Therefore, the temperature of the first adsorption component (15A) decreases, and its adsorption efficiency increases. Furthermore, the heat from the outdoor air is recovered by the refrigerant via the evaporator (36). Therefore, this heat can be used for the regeneration of the second adsorption component (15B).

[0159] In Variation 2, the controller (C) controls the rotational speed of the compressor (81) to cool the air flowing in the suction pipe (21) to below the dew point temperature using the evaporator (36). Specifically, the controller (C) calculates the dew point temperature of the air flowing in the suction pipe (21) based on the temperature detected by the temperature sensor (51) and the humidity detected by the humidity sensor (52), and then calculates the target evaporation pressure of the evaporator (36) to achieve the air temperature below the dew point temperature. The controller (C) controls the rotational speed of the compressor (81) to bring the evaporation pressure of the evaporator (36) to the target evaporation pressure. As a result, moisture in the air condenses, dehumidifying the air.

[0160] In the first and second operations, the air dehumidified by the evaporator (36) flows through the first adsorption unit (15A) and the second adsorption unit (15B). As a result, it is possible to suppress the adhesion of moisture in the air to the first adsorption unit (15A) and the second adsorption unit (15B), and to suppress the deterioration of the adsorbent due to the influence of moisture. Especially when the adsorbent is an amine-based substance, the adsorbent is prone to deterioration due to the influence of moisture. By dehumidifying the air upstream of the adsorption units (15A, 15B), the deterioration of adsorbents containing amine-based substances can be effectively suppressed.

[0161] (9-3) Variation Example 3

[0162] In variation 3, the evaporator (36) includes an inflow-side evaporator (41) and an outflow-side evaporator (42). Figure 11 As shown, the inflow-side evaporator (41) is disposed in the suction pipe (21), and the outflow-side evaporator (42) is disposed in the discharge pipe (24). An external air temperature sensor (53) for detecting the temperature of outdoor air is provided in the suction pipe (21).

[0163] like Figure 12As shown, the refrigerant circuit (R) of Modified Example 3 has a first low-pressure flow path (88a) and a second low-pressure flow path (88b) arranged side by side. An inflow-side evaporator (41) and a first low-pressure on / off valve (91a) are provided in the first low-pressure flow path (88a). The first low-pressure on / off valve (91a) is located upstream of the inflow-side evaporator (41) in the first low-pressure flow path (88a). An outflow-side evaporator (42) and a second low-pressure on / off valve (91b) are provided in the second low-pressure flow path (88b). The second low-pressure on / off valve (91b) is located upstream of the second evaporator (36b) in the second low-pressure flow path (88b).

[0164] In the first and second operations, the controller (C) controls the refrigerant circuit (R) based on the external air temperature detected by the external air temperature sensor (53) to switch the first refrigerant action in which the refrigerant flows in the inflow side evaporator (41) and the second refrigerant action in which the refrigerant flows in the outflow side evaporator (42).

[0165] Specifically, when the outdoor air temperature is higher than a specified value, the controller (C) opens the first low-pressure on / off valve (91a) and closes the second low-pressure on / off valve (91b). As a result, in the refrigerant circuit (R), the first refrigerant action occurs, where the refrigerant flows in the inflow-side evaporator (41) and stops flowing out of the outflow-side evaporator (42). When the outdoor air temperature is relatively high, the temperature difference between the refrigerant and the air in the inflow-side evaporator (41) increases. Therefore, the heat absorbed from the outdoor air to the refrigerant in the inflow-side evaporator (41) increases, which can improve the COP of the refrigeration cycle device (80). In addition, the cooling effect and dehumidification effect of the air in the suction pipe (21) can be increased.

[0166] When the outdoor air temperature is lower than a specified value, the controller (C) closes the second low-pressure on / off valve (91b) and opens the first low-pressure on / off valve (91a). As a result, in the refrigerant circuit (R), a second refrigerant operation occurs where the refrigerant flows in the outflow-side evaporator (42) and stops in the inflow-side evaporator (41). When the outdoor air temperature is relatively low, the temperature difference between the refrigerant and the air in the inflow-side evaporator (41) becomes smaller. In this case, the heat of the outside air cannot be fully recovered in the inflow-side evaporator (41), and the cooling and dehumidification effects of the air cannot be fully obtained. In Modification 3, under such conditions, the refrigerant flows in the outflow-side evaporator (42), so the residual heat of the air used for the regeneration of the first adsorption component (15A) and the second adsorption component (15B) can be recovered to the refrigerant circuit (R). Therefore, the COP of the refrigeration cycle device (80) can be improved.

[0167] (9-4) Variation 4

[0168] exist Figure 13 In the modified example 4 shown, an auxiliary evaporator (75) and a water container (76) serving as a water recovery unit are provided in the recovery unit (60). The auxiliary evaporator (75) is provided side-by-side with the evaporator (36) in the refrigerant circuit (R), for example. The water container (76) is connected to the main flow path (61c) of the recovery flow path (61). Gas containing carbon dioxide flowing in the recovery flow path (61) passes through the water container (76). The auxiliary evaporator (75) is disposed inside the water container (76).

[0169] The auxiliary evaporator (75) causes the water contained in the gas flowing in the water container (76) to condense. The condensed water is recycled back to the water container (76), for example, by being discharged into the interior of the water container (76) through a drain.

[0170] The controller (C) can also control the speed of the compressor (81) in the same way as in Modification 2, so that water condenses from the gas. Alternatively, a pressure regulating valve can be installed in the refrigerant circuit (R) to adjust the evaporation pressure of the auxiliary evaporator (75). The water recovery unit can also be a tray that receives water condensed by the auxiliary evaporator (75).

[0171] (9-5) Variation 5

[0172] Figure 14 and Figure 15 The carbon dioxide recovery system (1) of Modified Example 5 shown differs from the above embodiment in the configuration of the first adsorption unit (U1), the second adsorption unit (U2), and the refrigerant circuit (R).

[0173] (9-5-1) Composition of a carbon dioxide recovery system

[0174] like Figure 14 As shown, the first adsorption unit (U1) has a first housing (11A). The first housing (11A) has a first inflow-side partition plate (16A) and a first outflow-side partition plate (17A). The first inflow-side partition plate (16A) is located upstream of the air flow path (20) of the first housing (11A), and the first outflow-side partition plate (17A) is located downstream of the air flow path (20) of the first housing (11A). Inside the first housing (11A), a first space (S1) is formed between the first inflow-side partition plate (16A) and the first outflow-side partition plate (17A). A first inlet (I1) is formed in the first inflow-side partition plate (16A), and a first outlet (O1) is formed in the first outflow-side partition plate (17A).

[0175] A first inflow side flow path (26A) and a first outflow side flow path (27A) are formed in the first housing (11A). The first inflow side flow path (26A) and the first outflow side flow path (27A) constitute a first flow path that can communicate with the first space (S1). A first fan (35A) is disposed in the first inflow side flow path (26A). The first fan (35A) may also be disposed in the first outflow side flow path (27A). In Modification 5, a first evaporator (36A) is disposed in the first outflow side flow path (27A).

[0176] The second adsorption unit (U2) has a second housing (11B). The second housing (11B) has a second inflow-side partition plate (16B) and a second outflow-side partition plate (17B). The second inflow-side partition plate (16B) is located upstream of the air flow path (20) of the second housing (11B), and the second outflow-side partition plate (17B) is located downstream of the air flow path (20) of the second housing (11B). Inside the second housing (11B), a second space (S2) is formed between the second inflow-side partition plate (16B) and the second outflow-side partition plate (17B). A second inlet (I2) is formed in the second inflow-side partition plate (16B), and a second outlet (O2) is formed in the second outflow-side partition plate (17B).

[0177] A second inflow side flow path (26B) and a second outflow side flow path (27B) are formed in the second housing (11B). The second inflow side flow path (26B) and the second outflow side flow path (27B) constitute a second flow path that can communicate with the second space (S2). A second fan (35B) is arranged in the second inflow side flow path (26B). The second fan (35B) may also be arranged in the second outflow side flow path (27B). In Modification 5, a second evaporator (36B) is arranged in the second outflow side flow path (27B).

[0178] The airflow path switching mechanism (30) in Modified Example 5 is the same as in the embodiment. A first inflow side damper (31) is provided at the first inlet (I1), a first outflow side damper (32) is provided at the first outlet (O1), a second inflow side damper (33) is provided at the second inlet (I2), and a second outflow side damper (34) is provided at the second outlet (O2).

[0179] like Figure 15As shown, the refrigerant circuit (R) of Modified Example 5 has a first evaporator (36A) and a second evaporator (36B). The first evaporator (36A) and the second evaporator (36B) are arranged side by side in the refrigerant circuit (R). Specifically, a first low-pressure flow path (88a) and a second low-pressure flow path (88b) are arranged side by side on the suction side of the compressor (81) in the refrigerant circuit (R). The first evaporator (36A) is located in the first low-pressure flow path (88a), and the second evaporator (36B) is located in the second low-pressure flow path (88b).

[0180] The refrigerant flow path switching mechanism (90) of Modification 5 includes a first low-pressure side valve (93a) and a second low-pressure side valve (93b). The first low-pressure side valve (93a) is disposed in the first low-pressure flow path (88a), and the second low-pressure side valve (93b) is disposed in the second low-pressure flow path (88b). In this example, the first low-pressure side valve (93a) and the second low-pressure side valve (93b) are electromagnetic on / off valves. The first low-pressure side valve (93a) and the second low-pressure side valve (93b) can also be electronic expansion valves or flow regulating valves capable of adjusting their opening degree.

[0181] In Modification 5, when the refrigerant flow path switching mechanism (90) is in the first state, the first on-off valve (90a) is in the open state, the second on-off valve (90b) is in the closed state, the first low-pressure side valve (93a) is in the closed state, and the second low-pressure side valve (93b) is in the open state. When the refrigerant flow path switching mechanism (90) is in the second state, the second on-off valve (90b) is in the open state, the first on-off valve (90a) is in the closed state, the second low-pressure side valve (93b) is in the closed state, and the first low-pressure side valve (93a) is in the open state.

[0182] (9-5-2) Operational movements

[0183] The carbon dioxide recovery system (1) alternately operates in the first and second modes. In Variation 5, the controls associated with the first evaporator (36A) and the second evaporator (36B) differ from the controls in the implementation method.

[0184] In the first operation, the controller (C) stops the first fan (35A) and starts the second fan (35B). In the first operation, the controller (C) controls the refrigerant flow path switching mechanism (90), the air flow path switching mechanism (30), and the recovery switching mechanism (64), causing the first radiator (18A) to heat the first adsorption component (15A), the target air in the air flow path (20) to flow in the second inflow side flow path (26B) and the second space (S2), and the carbon dioxide released from the first adsorption component (15A) to be transported to the recovery tank (63) via the recovery flow path (61). Specifically, in the first operation, the controller (C) sets the refrigerant flow path switching mechanism (90) to the first state, the air flow path switching mechanism (30) to the fourth state, and the recovery switching mechanism (64) to the fifth state. More specifically, in the first operation, the controller (C) closes the first inflow side damper (31) and the first outflow side damper (32), opens the second inflow side damper (33) and the second outflow side damper (34), opens the first recovery valve (64a), closes the second recovery valve (64b), opens the first inlet valve (74a), closes the second inlet valve (74b), opens the first on / off valve (90a), closes the second on / off valve (90b), opens the auxiliary on / off valve (91), closes the first low-pressure side valve (93a), and opens the second low-pressure side valve (93b).

[0185] exist Figure 15 In the refrigerant circuit (R) shown, the refrigerant compressed by the compressor (81) is split into a first high-pressure flow path (85a) and an auxiliary high-pressure flow path (86). The refrigerant in the first high-pressure flow path (85a) dissipates heat to the air in the first space (S1) as it flows through the first radiator (18A). The refrigerant in the auxiliary high-pressure flow path (86) dissipates heat to the water around it as it flows through the auxiliary radiator (73). The refrigerant that has passed through the first high-pressure flow path (85a) and the auxiliary high-pressure flow path (86) merges in the confluence path (87) and is then depressurized by the expansion valve (82). The depressurized refrigerant flows in the second low-pressure flow path (88b) and passes through the second evaporator (36B). The refrigerant in the second evaporator (36B) absorbs heat from the surrounding air and evaporates. The refrigerant evaporated in the second evaporator (36B) is drawn into the compressor (81) and compressed again.

[0186] In the first operation, outdoor air from the outdoor space flows into the second space (S2) through the second inflow side passage (26B) and the second inlet (I2). In the second space (S2), carbon dioxide in the air is adsorbed by the second adsorption component (15B). The air that has passed through the second adsorption component (15B) flows through the second outlet (O2) in the second outflow side passage (27B). In the second evaporator (36B) of the second outflow side passage (27B), the air exchanges heat with the refrigerant, and the heat of the air is recovered as the heat of vaporization of the refrigerant. The air in the second outflow side passage (27B) is discharged into the outdoor space. In the first operation, the first radiator (18A) heats the first adsorption component (15A). As a result, carbon dioxide is removed from the first adsorption component (15A).

[0187] In the second operation, the controller (C) stops the second fan (35B) and starts the first fan (35A). In the second operation, the controller (C) controls the refrigerant flow path switching mechanism (90), the air flow path switching mechanism (30), and the recovery switching mechanism (64), causing the second radiator (18B) to heat the second adsorption component (15B), and the target air in the air flow path (20) to flow in the first inflow side flow path (26A) and the first space (S1). Carbon dioxide released from the second adsorption component (15B) is transported to the recovery tank (63) via the recovery flow path 61. Specifically, in the second operation, the controller (C) sets the refrigerant flow path switching mechanism (90) to the second state, the air flow path switching mechanism (30) to the third state, and the recovery switching mechanism (64) to the sixth state. More specifically, in the second operation, the controller (C) closes the second inflow side damper (33) and the second outflow side damper (34), opens the first inflow side damper (31) and the first outflow side damper (32), opens the second recovery valve (64b), closes the first recovery valve (64a), opens the second inlet valve (74b), closes the first inlet valve (74a), opens the second on / off valve (90b), closes the first on / off valve (90a), opens the auxiliary on / off valve (91), closes the second low-pressure side valve (93b), and opens the first low-pressure side valve (93a).

[0188] exist Figure 15In the refrigerant circuit (R) shown, the refrigerant compressed by the compressor (81) is split into the second high-pressure flow path (85b) and the auxiliary high-pressure flow path (86). The refrigerant in the second high-pressure flow path (85b) dissipates heat to the air in the second space (S2) as it flows through the second radiator (18B). The refrigerant in the auxiliary high-pressure flow path (86) dissipates heat to the water around it as it flows through the auxiliary radiator (73). The refrigerant that has passed through the second high-pressure flow path (85b) and the auxiliary high-pressure flow path (86) merges in the confluence path (87) and is then depressurized by the expansion valve (82). The depressurized refrigerant flows in the first low-pressure flow path (88a) and passes through the first evaporator (36A). The refrigerant in the first evaporator (36A) absorbs heat from the surrounding air and evaporates. The refrigerant evaporated in the first evaporator (36A) is drawn into the compressor (81) and compressed again.

[0189] In the second operation, outdoor air from the outdoor space flows into the first space (S1) through the first inflow side passage (26A) and the first inlet (I1). In the first space (S1), carbon dioxide in the air is adsorbed by the first adsorption component (15A). The air that has passed through the first adsorption component (15A) flows through the first outlet (O1) in the first outflow side passage (27A). In the first evaporator (36A) of the first outflow side passage (27A), the air exchanges heat with the refrigerant, and the heat of the air is recovered as the heat of vaporization of the refrigerant. The air in the first outflow side passage (27A) is discharged into the outdoor space. In the second operation, the second radiator (18B) heats the second adsorption component (15B). As a result, carbon dioxide is removed from the second adsorption component (15B).

[0190] In Modification 5, at the start of the second operation, the relatively high-temperature air from the first space (S1) on the regeneration side passes through the first evaporator (36A). Therefore, in the first evaporator (36A), the heat utilized in the regeneration of the first adsorption unit (15A) can be recovered. In Modification 5, at the start of the first operation, the relatively high-temperature air from the second space (S2) on the regeneration side passes through the second evaporator (36B). Therefore, in the second evaporator (36B), the heat utilized in the regeneration of the second adsorption unit (15B) can be recovered.

[0191] (9-6) Variation 6

[0192] Compared with Modification 5, Modification 6 differs in the configuration of the first evaporator (36A) and the second evaporator (36B). For example... Figure 16As shown, the first evaporator (36A) is disposed on the upstream side of the first space (S1), i.e., the first inflow side flow path (26A), and the second evaporator (36B) is disposed on the upstream side of the second space (S2), i.e., the second inflow side flow path (26B). The configuration of Modification 6 is the same as that of Modification 5 except for the above.

[0193] In Modification 6, during the first operation, outdoor air passes through the second evaporator (36B) in the second inflow side passage (26B). The air cooled by the second evaporator (36B) passes through the second adsorption unit (15B) in the second space (S2). Therefore, the temperature of the second adsorption unit (15B) decreases, and its adsorption efficiency increases. Furthermore, the heat from the outdoor air is recovered by the refrigerant via the second evaporator (36B). Therefore, this heat can be used for the regeneration of the first adsorption unit (15A).

[0194] In Modification 6, during the second operation, outdoor air passes through the first evaporator (36A) in the first inflow side passage (26A). The air cooled by the first evaporator (36A) passes through the first adsorption member (15A) in the first space (S1). Therefore, the temperature of the first adsorption member 1 decreases, and the adsorption efficiency of the first adsorption member (15A) increases. Furthermore, the heat from the outdoor air is recovered by the refrigerant via the first evaporator (36A). Therefore, this heat can be used for the regeneration of the second adsorption member (15B).

[0195] In Modification 6, similarly to Modification 2, the controller (C) controls the rotational speed of the compressor (81) so that the first evaporator (36A) and the second evaporator (36B) cool the air to below the dew point temperature. This allows for the dehumidification of the air flowing before passing through the adsorption components (15A, 15B).

[0196] In Modifications 5 and 6, the number of adsorption units (U) is only one. The carbon dioxide recovery system (1) may also have three or more adsorption units (U). In Modifications 5 and 6, a single inflow path connected to the inflow ends of the first inflow side path (26A) and the second inflow side path (26B) may be provided, with a fan configured in the inflow path. A single outflow path connected to the outflow ends of the first outflow side path (27A) and the second outflow side path (27B) may also be provided, with a fan configured in the outflow path. The refrigerant circuit (R) of Modifications 5 and 6 may also be applied to... Figure 1The carbon dioxide recovery system (1) of the above-described embodiment is shown. In this case, the first evaporator (36) of Modification 5 may also be configured in the first outflow side branch pipe (23A) as the first flow path, and the second evaporator (36B) of Modification 5 may be configured in the second outflow side branch pipe (23B) as the second flow path. Alternatively, the first evaporator (36) of Modification 6 may be configured in the first inflow side branch pipe (22A) as the first flow path, and the second evaporator (36B) of Modification 6 may be configured in the second inflow side branch pipe (22B) as the second flow path.

[0197] (10) and other implementation methods

[0198] In the above-described embodiments and variations, the configuration described below may also be adopted.

[0199] The carbon dioxide recovery system (1) may not be a direct DAC system that recovers carbon dioxide from the atmosphere. For example, the carbon dioxide recovery system (1) may also recover carbon dioxide from air mixed with industrial exhaust gases.

[0200] The pressure reducing mechanism may not be an expansion valve (82), but rather a capillary tube or an expander powered by the refrigerant. The expansion valve (82) may also be a temperature-sensing expansion valve.

[0201] The adsorption component (50) can also adsorb carbon dioxide from indoor air without adsorbing outdoor air. The adsorption component (50) can also be used, for example, in ventilation devices for indoor air exchange.

[0202] The first and second containment sections may not necessarily be shells composed of a single component; they may also be formed by connecting multiple components together to create the first space (S1) and the second space (S2).

[0203] The air flow path switching mechanism (30) can be a component other than a damper, such as a sliding gate, a ball valve for switching air flow, etc.

[0204] The refrigerant flow path switching mechanism (90) may not be an on / off valve, but may be a three-way valve or a four-way valve.

[0205] The recycling switching mechanism (64) may not be an on / off valve, but may be a three-way valve, a four-way valve or a rotary valve.

[0206] The supply switching mechanism may not be an on / off valve, but may be a three-way valve, a four-way valve, or a rotary valve.

[0207] The recovery unit for recovering carbon dioxide does not necessarily have to be a recovery tank; for example, it could be an adsorption unit that adsorbs the recovered carbon dioxide. The carbon dioxide recovery system (1) may not necessarily have a recovery unit. The recovery unit (60) may also introduce the recovered carbon dioxide into the ground. In other words, the recovery unit for recovering carbon dioxide can also be soil.

[0208] The recovery unit (60) may also include a first recovery flow path communicating with a first space, a second recovery flow path communicating with a second space, a first pump disposed in the first recovery flow path, and a second pump disposed in the second recovery flow path. In this configuration, the controller (C) operates the first pump (62) and stops the second pump (62) in the first operation. As a result, carbon dioxide detached from the first adsorption component (15A) can be transported to the recovery tank (63) through the first recovery flow path. In the second operation, the controller (C) operates the second pump (62) and stops the first pump (62). As a result, carbon dioxide detached from the second adsorption component (15B) can be transported to the recovery tank (63) through the second recovery flow path.

[0209] The carbon dioxide recovery system (1) may also be without a fan in the air flow path (20). In this case, it is sufficient to guide air supplied from other devices, such as factory exhaust gas, into the air flow path (20).

[0210] The embodiments and variations have been described above. However, it should be understood that various changes in manner and details can be made without departing from the spirit and scope of the claims. Furthermore, the above embodiments, variations, and other embodiments can be appropriately combined or substituted as long as they do not impair the function of the object of this disclosure.

[0211] The terms “first,” “second,” “third,” etc., used above are for distinguishing the statements that are given to these statements, and there is no limit to the number or order of these statements.

[0212] Industrial applicability

[0213] As explained above, this disclosure is useful for carbon dioxide recovery systems.

[0214] Explanation of reference numerals in the attached figures

[0215] 1. Carbon Dioxide Recovery System

[0216] 11A First Shell (First Containment Section)

[0217] 11B Second Shell (Second Containment Section)

[0218] 15A First Adsorption Component

[0219] 15B Second Adsorption Component

[0220] 18A First Heatsink

[0221] 18B Second Radiator

[0222] 21. Suction pipe (upstream flow path)

[0223] 22A First inflow side branch pipe (first flow path)

[0224] 22B Second inflow branch pipe (second flow path)

[0225] 23A First outflow branch pipe (first flow path)

[0226] 23B Second outflow branch pipe (second flow path)

[0227] 24. Discharge pipe (downstream flow path)

[0228] 26A 1st inflow side flow path (1st flow path)

[0229] 26B 2nd inflow side flow path (2nd flow path)

[0230] 27A 1st outflow side flow path (1st flow path)

[0231] 27B 2nd outflow side flow path (2nd flow path)

[0232] 30 Airflow path switching mechanism

[0233] 36 Evaporator

[0234] 60 recycling units

[0235] 61 Recycling Flow Path

[0236] 63 Recycling Tanks (Recycling Department)

[0237] 64 Recycling Switching Mechanism

[0238] 71 Supply Route

[0239] 73 Auxiliary Radiator

[0240] 75 Auxiliary Evaporator

[0241] 81 Compressor

[0242] 82 Expansion valve (pressure reducing mechanism)

[0243] 87 Confluence Road

[0244] 90 Refrigerant Flow Path Switching Mechanism

[0245] C. Controller (Control Unit)

[0246] R refrigerant circuit

[0247] S1 First Space

[0248] S2 Second Space

Claims

1. A carbon dioxide recovery system, comprising: The first adsorption component (15A) and the second adsorption component (15B) adsorb carbon dioxide from the target air, respectively; The refrigerant circuit (R) for performing a refrigeration cycle has a compressor (81), a first radiator (18A) and a second radiator (18B) arranged in parallel, a pressure reducing mechanism (82), an evaporator (36, 36A, 36B), and a refrigerant flow path switching mechanism (90) for switching the flow of refrigerant between the first radiator (18A) and the second radiator (18B). The first receiving section (11A) has a first space (S1) in which the first adsorption member (15A) and the first heat sink (18A) are disposed; The second receiving section (11B) has a second space (S2) in which the second adsorption member (15B) and the second heat sink (18B) are arranged; An airflow switching mechanism (30) switches the airflow between the first space (S1) and the second space (S2); and The recovery unit (60) selectively recovers carbon dioxide that has escaped from the first adsorption component (15A) and the second adsorption component (15B).

2. The carbon dioxide recovery system according to claim 1, wherein, The recovery unit (60) includes: a recovery flow path (61) for conveying carbon dioxide separated from the first adsorption component (15A) and the second adsorption component (15B) to a designated recovery section (63); and a recovery switching mechanism (64) for switching the flow of carbon dioxide in the recovery flow path (61). The carbon dioxide recovery system also includes a control unit (C) that controls the refrigerant flow path switching mechanism (90), the air flow path switching mechanism (30), and the recovery switching mechanism (64) to perform a first action and a second action. In the first action, the first radiator (18A) heats the first adsorption component (15A), the target air flows in the second space (S2), and the carbon dioxide detached from the first adsorption component (15A) is transported to the recovery unit (63) side via the recovery flow path (61). In the second action, the second radiator (18B) heats the second adsorption component (15B), the target air flows in the first space (S1), and the carbon dioxide detached from the second adsorption component (15B) is transported to the recovery unit (63) side via the recovery flow path (61).

3. The carbon dioxide recovery system according to claim 2, wherein, The refrigerant flow path switching mechanism (90) is configured to switch between a first state in which the refrigerant flows to the first radiator (18A) and a second state in which the refrigerant flows to the second radiator (18B). The airflow path switching mechanism (30) is configured to switch between a third state in which the object space containing the object air is connected to the first space (S1) and the object space is blocked from the second space (S2), and a fourth state in which the object space is connected to the second space (S2) and the object space is blocked from the first space (S1). The recycling switching mechanism (64) is configured to switch between a fifth state that connects the first space (S1) to the recycling unit (63) and a sixth state that connects the second space (S2) to the recycling unit (63). In the first operation, the control unit (C) controls the refrigerant flow path switching mechanism (90) to the first state, the air flow path switching mechanism (30) to the fourth state, and the recovery switching mechanism (64) to the fifth state. In the second operation, the control unit (C) controls the refrigerant flow path switching mechanism (90) to the second state, the air flow path switching mechanism (30) to the third state, and the recovery switching mechanism (64) to the sixth state.

4. The carbon dioxide recovery system according to any one of claims 1 to 3, further comprising a downstream flow path (24) located downstream of the first containment section (11A) and the second containment section (11B), The evaporator (36) is disposed in the downstream flow path (24).

5. The carbon dioxide recovery system according to any one of claims 1 to 3, further comprising an upstream flow path (21) located upstream of the first containment section (11A) and the second containment section (11B), The evaporator (36) is configured in the upstream flow path (21).

6. The carbon dioxide recovery system according to claim 5, comprising a control unit (C) that controls the rotational speed of the compressor (81) to cool the air to below the dew point temperature by the evaporator (36).

7. The carbon dioxide recovery system according to any one of claims 1 to 6, wherein, The refrigerant circuit (R) has a confluence path (87) that connects to both the liquid side end of the first radiator (18A) and the liquid side end of the second radiator (18B). The pressure reducing mechanism (82) is located in the merging path (87).

8. The carbon dioxide recovery system according to any one of claims 1 to 7, wherein, The refrigerant circuit (R) has an auxiliary radiator (73) for heating water to generate water vapor. It also has a supply path (71) for supplying water vapor generated by the auxiliary radiator (73) to the interior of the first space (S1) and the second space (S2).

9. The carbon dioxide recovery system according to any one of claims 2 to 8, wherein, The refrigerant circuit (R) has an auxiliary evaporator (75) configured in the recovery flow path (61).

10. The carbon dioxide recovery system according to claim 1, wherein, The carbon dioxide recovery system also includes: a first flow path (22A, 23A, 26A, 27A) capable of communicating with the first space (S1) of the first containment section (11A); and A second flow path (22B, 23B, 26B, 27B) capable of communicating with the second space (S2) of the second containment section (11B), The refrigerant circuit (R) has a first evaporator (36A) and a second evaporator (36B) arranged side by side as evaporators. The first evaporator (36A) is configured in the first flow path (22A, 23A, 26A, 27A). The second evaporator (36B) is configured in the second flow path (22B, 23B, 26B, 27B).

11. The carbon dioxide recovery system according to claim 10, wherein, The recovery unit (60) includes: a recovery flow path (61) for conveying carbon dioxide separated from the first adsorption unit (15A) and the second adsorption unit (15B) to a designated recovery section (63); and A recycling switching mechanism (64) switches the flow of carbon dioxide in the recycling flow path (61). The carbon dioxide recovery system also includes a control unit (C) that controls the refrigerant flow path switching mechanism (90), the air flow path switching mechanism (30), and the recovery switching mechanism (64) to perform a first action and a second action. In the first action, the first radiator (18A) heats the first adsorption component (15A), and the target air flows in the second space (S2) and the second evaporator (36B) of the second flow path (22B, 23B, 26B, 27B). Carbon dioxide released from the first adsorption component (15A) is transported to the recovery section (63) via the recovery flow path (61). In the second operation, the second radiator (18B) heats the second adsorption component (15B). The target air flows in the first space (S1) and the first evaporator (36A) of the first flow path (22A, 23A, 26A, 27A). Carbon dioxide released from the second adsorption component (15B) is transported to the recovery section (63) via the recovery flow path (61).

12. The carbon dioxide recovery system according to claim 11, wherein, The refrigerant flow path switching mechanism (90) is configured to switch between a first state in which the refrigerant flows to the first radiator (18A) and the second evaporator (36B) and a second state in which the refrigerant flows to the second radiator (18B) and the first evaporator (36A). The airflow path switching mechanism (30) is configured to switch between a third state in which the first space (S1) is connected to the object space containing the object air and the first flow path (22A, 23A, 26A, 27A) and the second space (S2) is blocked from the object space and the second flow path (22B, 23B, 26B, 27B) and a fourth state in which the second space (S2) is connected to the object space and the first flow path (22A, 23A, 26A, 27A) and the first space (S1) is blocked from the object space and the first flow path (22A, 23A, 26A, 27A). The recycling switching mechanism (64) is configured to switch between a fifth state that connects the first space (S1) to the recycling unit (63) and a sixth state that connects the second space (S2) to the recycling unit (63). In the first operation, the control unit (C) controls the refrigerant flow path switching mechanism (90) to the first state, the air flow path switching mechanism (30) to the fourth state, and the recovery switching mechanism (64) to the fifth state. In the second operation, the control unit (C) controls the refrigerant flow path switching mechanism (90) to the second state, the air flow path switching mechanism (30) to the third state, and the recovery switching mechanism (64) to the sixth state.

13. The carbon dioxide recovery system according to any one of claims 10 to 12, wherein, The first flow path (23A, 27A) is located downstream of the first space (S1). The first flow path (23B, 27B) is located downstream of the second space (S2).

14. The carbon dioxide recovery system according to any one of claims 10 to 12, wherein, The first flow path (22A, 26A) is located upstream of the first space (S1). The second flow path (22B, 26B) is located on the upstream side of the second space (S2).

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