Carbon dioxide recovery system

Abstract

This carbon dioxide recovery system is provided with: an outdoor unit for a first heat pump device, said outdoor unit having a heat exchanger and a first blower; a recovery unit that has an adsorbent capable of adsorbing carbon dioxide and that recovers carbon dioxide from air; and a separation unit that separates carbon dioxide from the adsorbent moved from the recovery unit, and when the first heat pump device performs a cooling operation, the first blower sends the airflow heated by the heat exchanger toward the separation unit.

Description

Technical Field

[0001] The present disclosure relates to carbon dioxide recovery systems. Background Art

[0002] Patent Document 1 discloses a device for removing carbon dioxide from the air using an adsorbent capable of adsorbing carbon dioxide.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-131166 Summary of the invention

[0006] Problems to be solved by the invention

[0007] There is a demand for improving the recovery efficiency of carbon dioxide by an adsorbent. In the structure of Patent Document 1, a reduced pressure pump is used to separate carbon dioxide from an adsorbent, which increases the energy required for separation.

[0008] In view of the above situation, an object of the present disclosure is to provide a carbon dioxide recovery system capable of improving the recovery efficiency of carbon dioxide.

[0009] Means for solving problems

[0010] One embodiment of the carbon dioxide recovery system disclosed in the present invention comprises: an outdoor unit of a first heat pump device, the outdoor unit having a heat exchanger and a first blower; a recovery unit, the recovery unit having an adsorbent capable of adsorbing carbon dioxide and recovering carbon dioxide from the air; and a separation unit, the separation unit separating carbon dioxide from the adsorbent moved from the recovery unit, and when the first heat pump device performs a cooling operation, the first blower sends the airflow heated by the heat exchanger toward the separation unit.

[0011] Effects of the Invention

[0012] According to the present disclosure, it is possible to provide a carbon dioxide recovery system capable of improving the recovery efficiency of carbon dioxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the carbon dioxide recovery system of embodiment 1.

[0014] Figure 2 This is a schematic diagram of a carbon dioxide recovery system according to Embodiment 2.

[0015] Figure 3 This is a schematic diagram of a carbon dioxide recovery system according to Embodiment 3.

[0016] Figure 4This is a schematic diagram of a carbon dioxide recovery system in Embodiment 4.

[0017] Figure 5 This is a schematic diagram of a carbon dioxide recovery system in embodiment 5.

[0018] Figure 6 This is a schematic diagram of a carbon dioxide recovery system in embodiment 6.

[0019] Figure 7 This is a schematic diagram of a carbon dioxide recovery system in embodiment 7.

[0020] Figure 8 This is a schematic diagram of a carbon dioxide recovery system in embodiment 8.

[0021] Fig. 9 This is a schematic diagram of a carbon dioxide recovery system in Embodiment 9.

[0022] Fig.10 This is a schematic diagram of a carbon dioxide recovery system in embodiment 10.

[0023] Fig.11 This is a schematic diagram of a carbon dioxide recovery system in embodiment 11.

[0024] Fig. 12A This is an example of a Ts diagram of a normal vapor compression heat pump cycle.

[0025] Fig. 12B This is a schematic diagram of a heat pump cycle.

[0026] Fig.13 This is an example of a Ts diagram for a transcritical heat pump cycle.

[0027] Fig.14 This is an example of a Ts diagram of a heat pump cycle using a non-azeotropic mixed refrigerant.

[0028] Fig.15 This is a schematic diagram of a carbon dioxide recovery system in embodiment 12.

[0029] Fig.16 This is a schematic diagram of the scroll tube of embodiment 12. DETAILED DESCRIPTION

[0030] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In addition, the scope of the present disclosure is not limited to the following embodiments, and can be arbitrarily changed within the scope of the technical concept of the present disclosure. Implementation method 1.

[0031] Figure 1 This is a schematic diagram of the carbon dioxide recovery system 1 according to the first embodiment.

[0032] like Figure 1 As shown, the carbon dioxide recovery system 1 includes an outdoor unit 10 , a recovery unit 21 , and a separation unit 23 .

[0033] The outdoor unit 10 is a part of the first heat pump device and is used together with an indoor unit (not shown). In the present embodiment, the first heat pump device is an air conditioner having at least a function of cooling a room. The outdoor unit 10 and the indoor unit are connected by a pipe (not shown) for circulating a refrigerant.

[0034] The outdoor unit 10 includes a housing 11, a heat exchanger 12, and a first air-sending device 13. The outdoor unit 10 also includes a compressor (not shown) and the like.

[0035] The housing 11 has an inlet 14 and an outlet 15. The heat exchanger 12 and the first blower 13 are disposed inside the housing 11. The heat exchanger 12 exchanges heat between the refrigerant and the outside air (air). The first blower 13 blows air from the inside of the outdoor unit 10 to the outside.

[0036] When the first blower 13 is driven, air is sucked into the housing 11 from the suction port 14 . The air sucked into the housing 11 passes through the heat exchanger 12 and is blown out of the housing 11 from the blowout port 15 .

[0037] Hereinafter, the upstream side in the flow direction of the airflow generated by the first blower 13 is also simply referred to as the upstream side, and the downstream side in the flow direction of the airflow generated by the first blower 13 is also simply referred to as the downstream side.

[0038] The recovery unit 21 has a function of recovering carbon dioxide from the air. The recovery unit 21 is disposed downstream of the first blower 13. A first duct 22 is provided between the first blower 13 and the recovery unit 21 to transmit airflow from the first blower 13 to the recovery unit 21.

[0039] The recovery unit 21 has an adsorbent. The adsorbent includes a material that can adsorb carbon dioxide. Examples of materials that can adsorb carbon dioxide include amines, zeolites, silica gel, diatomaceous earth, alumina, activated carbon, and the like. A variety of materials can be selected from the above materials, and materials other than the above can also be used. The adsorbent can be granular (e.g., beaded (spherical), granular (cylindrical)). Alternatively, a powdered adsorbent can also be used. In this case, the powdered adsorbent can be carried on the surface of the substrate. The substrate can be, for example, in a honeycomb shape. For example, the powdered adsorbent can be carried on a honeycomb rotor. The adsorbent can be a liquid adsorption liquid.

[0040] The recovery unit 21 is configured to be able to hold the adsorbent at a position where it receives the airflow generated by the first blower 13 .

[0041] For example, the recovery unit 21 may include a container that can contain an adsorbent and has air permeability. In this case, the container is disposed at a position that receives the airflow generated by the first blower 13 .

[0042] Alternatively, for example, when the adsorbent is carried on the honeycomb rotor, the recovery unit 21 may include a support unit for supporting the honeycomb rotor at a position where the recovery unit 21 receives the airflow generated by the first blower 13 .

[0043] The airflow blown out from the blow-out port 15 driven by the first blower 13 contacts the adsorbent held in the recovery unit 21. As a result, air enters the adsorbent, or the air in the adsorbent is discharged. The recovery unit 21 allows the airflow generated by the first blower 13 to contact the adsorbent, so that the adsorbent adsorbs carbon dioxide. That is, in this embodiment, the recovery unit 21 uses the air supply power of the first blower 13 for the recovery of carbon dioxide.

[0044] The separation unit 23 has a function of separating carbon dioxide from the adsorbent adsorbing carbon dioxide. The separation unit 23 is arranged on the downstream side of the first blower 13. A second duct 24 for transmitting the airflow from the first blower 13 to the separation unit 23 is provided between the first blower 13 and the separation unit 23. The separation unit 23 is configured to be able to hold the adsorbent at a position receiving the airflow generated by the first blower 13.

[0045] The adsorbent that has adsorbed carbon dioxide in the recovery unit 21 moves to the separation unit 23. In addition, the adsorbent that has separated carbon dioxide in the separation unit 23 moves to the recovery unit 21 again.

[0046] like Figure 1 As shown, the adsorbent may be transported (moved) from the recovery unit 21 to the separation unit 23 via the first pipe 25 , and transported (moved) from the separation unit 23 to the recovery unit 21 via the second pipe 26 .

[0047] Alternatively, for example, when the adsorbent is carried on the honeycomb rotor, the honeycomb rotor may be arranged across the recovery section 21 and the separation section 23 , and the adsorbent may be moved between the recovery section 21 and the separation section 23 by the rotation of the honeycomb rotor.

[0048] The airflow blown out from the blow-out port 15 driven by the first blower 13 contacts the adsorbent held in the separation section 23. Here, when the first heat pump device performs cooling operation, the air sucked into the frame 11 from the suction port 14 is heated to, for example, 45°C to 70°C by the heat exchanger 12. The first blower 13 sends the airflow heated by the heat exchanger 12 toward the separation section 23. Therefore, the airflow heated by the heat exchanger 12 contacts the adsorbent held in the separation section 23. The separation section 23 heats the adsorbent by bringing the heated airflow sent from the first blower 13 into contact with the adsorbent, thereby separating carbon dioxide from the adsorbent. In the present embodiment, the separation section 23 uses the air supply power of the first blower 13 for the separation of carbon dioxide.

[0049] As described above, the carbon dioxide recovery system 1 of the present embodiment includes: an outdoor unit 10 of a first heat pump device, the outdoor unit 10 having a heat exchanger 12 and a first blower 13; a recovery unit 21 having an adsorbent capable of adsorbing carbon dioxide and recovering carbon dioxide from air; and a separation unit 23 that separates carbon dioxide from the adsorbent moved from the recovery unit 21. When the first heat pump device performs cooling operation, the first blower 13 sends the airflow heated by the heat exchanger 12 toward the separation unit 23.

[0050] The air heated by the heat exchanger 12 is supplied to the separation unit 23 by the air supply power of the first blower 13. The separation unit 23 uses the heat of the air heated by the heat exchanger 12 as at least a part of the heat source for separation of carbon dioxide. Therefore, carbon dioxide can be separated in an energy-saving and low-cost manner, and the recovery efficiency of carbon dioxide is improved.

[0051] Furthermore, the first blower 13 sends the airflow that has passed through the heat exchanger 12 toward both the recovery unit 21 and the separation unit 23 .

[0052] Thus, the air blowing power of the first air blower 13 can be used to collect and separate carbon dioxide, thereby achieving further energy saving. Implementation method 2.

[0053] Next, the carbon dioxide recovery system 1 according to Embodiment 2 will be described. The basic structure of the carbon dioxide recovery system 1 according to this embodiment is the same as that of Embodiment 1, and therefore the description will be mainly focused on the differences.

[0054] Figure 2 This is a schematic diagram of a carbon dioxide recovery system 1 according to a second embodiment.

[0055] like Figure 2 As shown, in the present embodiment, the carbon dioxide recovery system 1 further includes a second blower 31 , a control unit 32 , and a merging unit 33 .

[0056] The second blower 31 supplies the outside air or the indoor air which has not passed through the heat exchanger 12 to the recovery unit 21 via the junction 33. A third duct 34 is provided between the second blower 31 and the junction 33 to transfer the airflow from the second blower 31 to the junction 33.

[0057] The confluence part 33 is arranged between the first blower 13 and the recovery part 21. In the present embodiment, the first duct 22 is provided between the first blower 13 and the confluence part 33, and transmits the airflow from the first blower 13 to the confluence part 33. The confluence part 33 mixes the air from the first blower 13 after passing through the heat exchanger 12 with the outside air or indoor air from the second blower 31 that has not passed through the heat exchanger 12, and supplies the mixed air to the recovery part 21. When the first heat pump device performs cooling operation, the airflow generated by the first blower 13 is mixed with the outside air or indoor air sent by the second blower 31, so that the temperature is lowered and supplied to the recovery part 21. A temperature sensor (not shown) for measuring the temperature of the mixed air is provided at the confluence part 33.

[0058] In the present embodiment, the air flow of the mixed air formed by mixing the air from the first blower 13 and the outside air or the indoor air from the second blower 31 contacts the adsorbent held in the recovery unit 21. The mixed air flow contacts the adsorbent, and the adsorbent adsorbs carbon dioxide. That is, in the present embodiment, the recovery unit 21 uses the air supply power of the first blower 13 and the second blower 31 for the recovery of carbon dioxide.

[0059] The control unit 32 controls each structure of the carbon dioxide recovery system 1. In the present embodiment, the control unit 32 controls the flow rate of air supplied from the second blower 31 to the confluence portion 33 based on the measurement result of the temperature sensor provided at the confluence portion 33. For example, the control unit 32 may control the flow rate of air from the second blower 31 by controlling the opening of a flow control valve provided at the third duct 34. The control unit 32 may also control the flow rate of air from the second blower 31 by controlling the rotation speed of the second blower 31.

[0060] As described above, the carbon dioxide recovery system 1 of the present embodiment further includes the second blower 31 that supplies the outside air or the room air that has not passed through the heat exchanger 12 to the recovery unit 21 .

[0061] Thus, the outside air or indoor air from the second blower 31 can be used for the recovery of carbon dioxide in the recovery unit 21. In addition, when the temperature of the air in contact with the adsorbent is high, the adsorption efficiency of the adsorbent for carbon dioxide may be reduced. By supplying the outside air or indoor air that has not passed through the heat exchanger 12 to the recovery unit 21, the reduction in adsorption efficiency can be suppressed. Therefore, the recovery efficiency of carbon dioxide is improved.

[0062] The carbon dioxide concentration of indoor air often increases with human breathing. When the indoor air is supplied to the recovery unit 21 by the second blower 31, carbon dioxide can be recovered from air with a high carbon dioxide concentration, so the recovery efficiency of carbon dioxide is further improved.

[0063] In addition, when the air from the first blower 13 that has passed through the heat exchanger 12 is mixed with the outside air or indoor air from the second blower 31 that has not passed through the heat exchanger 12, the temperature of the air supplied to the recovery unit 21 can be lowered compared to the case where only the air from the first blower 13 is supplied to the recovery unit 21. The control unit 32 controls the flow rate of the air supplied from the second blower 31 to the confluence unit 33 based on the measurement result of the temperature sensor that measures the temperature of the mixed air, so that the temperature of the air in contact with the adsorbent can be more reliably adjusted to a temperature suitable for the adsorption of carbon dioxide. Implementation method 3.

[0064] Next, the carbon dioxide recovery system 1 according to Embodiment 3 will be described. The basic structure of the carbon dioxide recovery system 1 according to this embodiment is the same as that of Embodiment 1, and therefore the description will be mainly focused on the differences.

[0065] Figure 3 It is a schematic diagram of the carbon dioxide recovery system 1 of Embodiment 3.

[0066] like Figure 3 As shown, in the present embodiment, the carbon dioxide recovery system 1 further includes a restriction unit 35 .

[0067] The restriction portion 35 is provided between the first blower 13 and the recovery portion 21. The restriction portion 35 restricts the airflow generated by the first blower 13 from reaching the recovery portion 21. The restriction portion 35 is a plate-shaped member that blocks the airflow from the first blower 13 toward the recovery portion 21, for example.

[0068] In this embodiment, only the air from the second blower 31 is supplied to the adsorbent held in the recovery unit 21. The airflow generated by the second blower 31 is brought into contact with the adsorbent, so that the adsorbent adsorbs carbon dioxide. That is, in this embodiment, the recovery unit 21 uses the air supply power of the second blower 31 for the recovery of carbon dioxide.

[0069] As described above, the carbon dioxide recovery system 1 of the present embodiment further includes the restriction unit 35 provided between the first blower 13 and the recovery unit 21 and restricting the airflow heated by the heat exchanger 12 from reaching the recovery unit 21 .

[0070] Thus, the air heated by the heat exchanger 12 is not supplied to the recovery unit 21, but only the outside air or indoor air that has not passed through the heat exchanger 12 is supplied from the second blower 31. Therefore, it is possible to prevent the adsorption efficiency of carbon dioxide by the adsorbent from being reduced due to the temperature increase of the air supplied to the recovery unit 21. In addition, the air heated by the heat exchanger 12 is supplied only to the separation unit 23, so the amount of air supplied to the separation unit 23 can be increased. Therefore, the recovery efficiency of carbon dioxide is improved. Implementation method 4.

[0071] Next, the carbon dioxide recovery system 1 according to Embodiment 4 will be described. The basic structure of the carbon dioxide recovery system 1 according to this embodiment is the same as that of Embodiment 1, and therefore the description will be mainly focused on the differences.

[0072] Figure 4 It is a schematic diagram of the carbon dioxide recovery system 1 of the fourth embodiment.

[0073] like Figure 4 As shown, in the present embodiment, the carbon dioxide recovery system 1 further includes a second heat pump device 40 .

[0074] The second heat pump device 40 is provided between the first blower 13, the recovery unit 21, and the separation unit 23. The second heat pump device 40 includes an evaporator 41, a condenser 42, a compressor 43, and an expansion valve 44.

[0075] In the second heat pump device 40, the refrigerant circulates between the evaporator 41 and the condenser 42. Specifically, the refrigerant in the gas state compressed by the compressor 43 flows to the condenser 42. The refrigerant in the condenser 42 exchanges heat with the surrounding air to heat the surrounding air. The refrigerant that becomes a liquid state through heat exchange is expanded by the expansion valve 44 and flows into the evaporator 41. The refrigerant in the evaporator 41 exchanges heat with the surrounding air to cool the surrounding air. The refrigerant that becomes a gas state through heat exchange returns to the compressor 43.

[0076] The evaporator 41 is located between the first blower 13 and the recovery unit 21. In the present embodiment, the first duct 22 is provided between the first blower 13 and the evaporator 41 to transfer the airflow from the first blower 13 to the evaporator 41. The air from the first blower 13 is cooled by passing through the evaporator 41 and is supplied to the recovery unit 21. In addition, the air from the first blower 13 is dehumidified by passing through the evaporator 41.

[0077] The condenser 42 is located between the first blower 13 and the separation unit 23. In the present embodiment, the second duct 24 is provided between the first blower 13 and the condenser 42 to transfer the airflow from the first blower 13 to the condenser 42. The air from the first blower 13 is heated by passing through the condenser 42 and is supplied to the separation unit 23.

[0078] As described above, the carbon dioxide recovery system 1 of this embodiment further includes the second heat pump device 40 having the evaporator 41 and the condenser 42. The evaporator 41 is located between the first blower 13 and the recovery unit 21, and the condenser 42 is located between the first blower 13 and the separation unit 23.

[0079] By cooling the air from the first blower 13 using the evaporator 41, the temperature of the air supplied to the recovery unit 21 can be adjusted to a temperature suitable for the adsorption of carbon dioxide by the adsorbent. By heating the air from the first blower 13 using the condenser 42, the temperature of the air supplied to the separation unit 23 can be adjusted to a temperature suitable for separating carbon dioxide from the adsorbent. Therefore, the recovery efficiency of carbon dioxide can be improved. In addition, when the humidity of the air in contact with the adsorbent is high, the adsorption efficiency of carbon dioxide by the adsorbent may be reduced. By dehumidifying the air supplied to the recovery unit 21 using the evaporator 41, the reduction of the adsorption efficiency can be prevented.

[0080] In addition, the temperature suitable for the adsorbent to adsorb carbon dioxide is, for example, 5° C. to 30° C., and the temperature suitable for separating carbon dioxide from the adsorbent is, for example, 60° C. to 120° C. The present disclosure is not limited thereto, and the appropriate temperature varies depending on the specific material of the adsorbent.

[0081] Here, when the first heat pump device is an air conditioner having a function of cooling and heating a room, the first heat pump device performs a cooling operation and a heating operation according to the season, the temperature, and the like.

[0082] When the first heat pump device performs heating operation, the first blower 13 supplies the airflow cooled by the heat exchanger 12 to the recovery unit 21 through the evaporator 41 and supplies the airflow cooled by the heat exchanger 12 to the separation unit 23 through the condenser 42 .

[0083] The airflow cooled by the heat exchanger 12 can be heated by the condenser 42 and supplied to the separation unit 23. Therefore, even when the first heat pump device is performing a heating operation, carbon dioxide can be recovered and separated.

[0084] In addition, in the present embodiment, it is preferred that the second heat pump device 40 is a transcritical heat pump cycle in which the refrigerant operates at a pressure higher than the critical pressure. The working fluid used in the transcritical heat pump cycle is a refrigerant with carbon dioxide refrigerant as a main component. As the working fluid used in the transcritical heat pump cycle, carbon dioxide refrigerant, a mixed refrigerant using carbon dioxide refrigerant, etc. can be listed.

[0085] First, refer to Fig. 12A , a general vapor compression heat pump cycle in which the refrigerant operates at a pressure lower than the critical pressure is described. Fig. 12A This is an example of a Ts diagram of a normal vapor compression heat pump cycle. Fig. 12B This is a schematic diagram of the heat pump cycle. Fig. 12A In the equation, the vertical axis is temperature and the horizontal axis is entropy. Fig. 12A As shown, in a conventional vapor compression heat pump cycle, the refrigerant flowing inside the condenser 42 has a gas single-phase region (region from state 1 to state 1a), a gas-liquid two-phase region (region from state 1a to state 1b), and a liquid single-phase region (region from state 1b to state 2). The gas-liquid two-phase region (region from state 1a to state 1b) is a latent heat region in which the gas refrigerant liquefies without a temperature change. When the air upstream of the separation section is heated by the condenser 42, it is preferred that the temperature difference between the refrigerant and the air is large during the process from state 1 to state 2. However, in a conventional vapor compression heat pump cycle, the proportion of the gas-liquid two-phase region (region from state 1a to state 1b) as a latent heat region in the region from state 1 to state 2 is large, so it is difficult to give the refrigerant and the air a temperature difference.

[0086] Fig.13 This is an example of a Ts diagram for a transcritical heat pump cycle. Fig.13 In the equation, the vertical axis is temperature and the horizontal axis is entropy. Fig.13 As shown, in the transcritical heat pump cycle, the refrigerant flowing inside the condenser 42 becomes a refrigerant in a supercritical state. The specific heat of the refrigerant in the supercritical state changes, so there is no latent heat region, and the temperature of the refrigerant changes during the entire process from state 1 to state 2. Therefore, it is easy to form a temperature difference between the refrigerant and the air, which can reduce energy loss. In addition, the temperature of the refrigerant is easy to change, so it is easy to heat the refrigerant.

[0087] Therefore, when the second heat pump device 40 is a transcritical heat pump cycle, the air from the first blower 13 can be efficiently heated by the condenser 42. Therefore, the temperature of the air supplied to the separation unit 23 can be increased, and the recovery efficiency of carbon dioxide can be improved.

[0088] Alternatively, the second heat pump device 40 may use a non-azeotropic mixed refrigerant with different boiling points as the working fluid. For example, a mixed refrigerant containing carbon dioxide as a main component and mixed with another refrigerant with a different boiling point (propane, freon, etc.) may be used.

[0089] Fig.14 This is an example of a Ts diagram for a heat pump cycle using a non-azeotropic refrigerant mixture. Fig.14 In the figure, the vertical axis is temperature and the horizontal axis is entropy. In a heat pump cycle using a non-azeotropic mixed refrigerant, the boiling points of the mixed refrigerants are different, so the refrigerant flowing inside the condenser 42 has a latent heat region (the region from state 1a to state 1b) with temperature changes. The temperature of the refrigerant also changes in the latent heat region, so it is easy to form a temperature difference between the refrigerant and the air, and it is easy to increase the temperature of the refrigerant.

[0090] Therefore, when the second heat pump device 40 uses a non-azeotropic mixed refrigerant with different boiling points as a working fluid, the air from the first blower 13 can be efficiently heated by the condenser 42. Therefore, the temperature of the air supplied to the separation unit 23 can be increased, and the recovery efficiency of carbon dioxide can be improved. In addition, compared with the case where a single refrigerant is used as a working fluid, the internal pressure of the second heat pump device 40 can be reduced, so the pressure resistance design of the equipment can be relaxed. Implementation method 5.

[0091] Next, the carbon dioxide recovery system 1 according to Embodiment 5 will be described. The basic structure of the carbon dioxide recovery system 1 according to this embodiment is the same as that of Embodiments 1 to 4, and therefore the description will be mainly focused on the differences.

[0092] Figure 5 It is a schematic diagram of the carbon dioxide recovery system 1 of Embodiment 5.

[0093] This embodiment is a combination of Embodiment 2 and Embodiment 4. Specifically, the carbon dioxide recovery system 1 of this embodiment includes an outdoor unit 10 , a recovery unit 21 , a separation unit 23 , a second blower 31 , a control unit 32 , a merging unit 33 , and a second heat pump device 40 .

[0094] In the present embodiment, the confluence portion 33 is disposed between the first blower 13 and the evaporator 41. The first duct 22 is disposed between the first blower 13 and the confluence portion 33, and transmits airflow from the first blower 13 toward the evaporator 41. The confluence portion 33 mixes air from the first blower 13 that has passed through the heat exchanger 12 with outside air or indoor air from the second blower 31 that has not passed through the heat exchanger 12, and sends the mixed air toward the evaporator 41. The mixed air is cooled by passing through the evaporator 41, and is supplied to the recovery portion 21.

[0095] In addition, in the present embodiment, the temperature sensor is provided in front of the recovery unit 21 to measure the temperature of the air in front of the recovery unit 21 (i.e., the air after passing through the evaporator 41). The control unit 32 controls the flow rate of the air supplied from the second blower 31 to the confluence unit 33 based on the measurement result of the temperature sensor.

[0096] As described above, in the present embodiment, the second air-sending device 31 allows the outside air or the room air that has not passed through the heat exchanger 12 to pass through the evaporator 41 and supplies the air to the recovery unit 21 .

[0097] Thus, the outside air or indoor air from the second blower 31 can be used for the recovery of carbon dioxide in the recovery unit 21. In addition, the outside air or indoor air from the second blower 31 can be cooled and dehumidified by the evaporator 41 and supplied to the recovery unit 21. Therefore, the recovery efficiency of carbon dioxide is improved.

[0098] Furthermore, when the first heat pump device performs heating operation, the carbon dioxide recovery system 1 of this embodiment mixes the airflow generated by the first blower 13 with the outside air or indoor air sent by the second blower 31 to increase the temperature and supply the mixed air to the recovery unit 21 .

[0099] When the first heat pump device performs heating operation, the airflow generated by the first blower 13 is cooled by the heat exchanger 12. However, when the temperature of the air supplied to the recovery unit 21 is too low, the adsorption efficiency of carbon dioxide may be reduced. The airflow generated by the first blower 13 is mixed with the outside air or indoor air sent by the second blower 31, so that the temperature is increased and the air is supplied to the recovery unit 21. In this way, the adsorption efficiency of carbon dioxide can be prevented from being reduced.

[0100] When the first heat pump device performs heating operation, the temperature of the indoor air is higher than the temperature of the outdoor air. When the airflow generated by the first blower 13 is mixed with the indoor air sent by the second blower 31, the temperature of the airflow generated by the first blower 13 can be raised more effectively. Implementation method 6.

[0101] Next, the carbon dioxide recovery system 1 according to Embodiment 6 will be described. The basic structure of the carbon dioxide recovery system 1 according to this embodiment is the same as that of Embodiment 5, and therefore the description will be mainly focused on the differences.

[0102] Figure 6 It is a schematic diagram of the carbon dioxide recovery system 1 of the sixth embodiment.

[0103] In the present embodiment, the carbon dioxide recovery system 1 further includes a restriction unit 35 .

[0104] In the present embodiment, the restriction portion 35 is provided in the first duct 22 or the second duct 24. The restriction portion 35 restricts at least a part of the airflow generated by the first blower 13 from reaching the evaporator 41 or the condenser 42.

[0105] For example, the restriction portion 35 may be a plate-shaped member provided in the first duct 22 or the second duct 24 and blocking the airflow from the first blower 13 toward the evaporator 41 or the condenser 42. The restriction portion 35 may also be configured to be movable between the first duct 22 and the second duct 24. In this case, by changing the position of the restriction portion 35 relative to the first duct 22 or the second duct 24, the flow path opening rate of the restriction portion 35 to the first duct 22 or the second duct 24 is changed.

[0106] The restriction portion 35 may also be a flow control valve respectively provided in the first pipe 22 and the second pipe 24. In this case, the flow passage opening rate of the restriction portion 35 to the first pipe 22 is changed by changing the opening of the flow control valve provided in the first pipe 22, and the flow passage opening rate of the restriction portion 35 to the second pipe 24 is changed by changing the opening of the flow control valve provided in the second pipe 24.

[0107] The control unit 32 controls the flow passage opening rate of the first pipe 22 and the second pipe 24 by the restriction unit 35 according to the operation mode of the first heat pump device and the like.

[0108] For example, when the first heat pump device performs cooling operation, the control unit 32 controls the restriction unit 35 so that the flow path opening rate of the first pipe 22 becomes 0% and the flow path opening rate of the second pipe 24 becomes 100%. For example, when the restriction unit 35 is a plate-shaped member, Figure 6 As shown, the control unit 32 moves the restriction unit 35 toward the first pipe 22. When the restriction unit 35 is a flow control valve, the control unit 32 sets the opening of the flow control valve provided in the first pipe 22 to 0%, and sets the opening of the flow control valve provided in the second pipe 24 to 100%. Thus, the airflow heated by the heat exchanger 12 is restricted from reaching the evaporator 41 (i.e., supplied to the recovery unit 21). Therefore, it is possible to prevent the adsorption efficiency of the adsorbent on carbon dioxide from being reduced due to the increase in the temperature of the air supplied to the recovery unit 21.

[0109] When the first heat pump device performs heating operation, the control unit 32 controls the restriction unit 35 so that the flow path opening rate of the first pipe 22 becomes 100% and the flow path opening rate of the second pipe 24 becomes 0%. For example, when the restriction unit 35 is a plate-shaped member, the control unit 32 moves the restriction unit 35 toward the second pipe 24. When the restriction unit 35 is a flow control valve, the control unit 32 sets the opening of the flow control valve provided in the first pipe 22 to 100% and sets the opening of the flow control valve provided in the second pipe 24 to 0%. Thus, the air flow cooled by the heat exchanger 12 is restricted from reaching the condenser 42 (i.e., supplied to the separation unit 23). Therefore, it is possible to prevent the recovery efficiency of carbon dioxide from being reduced due to the decrease in the temperature of the air supplied to the separation unit 23. In addition, in this case, the second blower 31 may also blow air toward the condenser 42 (i.e., the separation unit 23).

[0110] The control of the flow channel opening rate by the control unit 32 is not limited to this, and the flow channel opening rate may be arbitrarily changed according to the conditions of each season.

[0111] For example, when the first heat pump device is in heating operation, the control unit 32 may control the restriction unit 35 so that the flow path opening rate of the first pipe 22 becomes 0% and the flow path opening rate of the second pipe 24 becomes 100%. Even in this case, the airflow cooled by the heat exchanger 12 can be heated by the condenser 42 and supplied to the separation unit 23, so that carbon dioxide can be separated. In addition, the air from the first blower 13 is dehumidified by passing through the heat exchanger 12, so it is easy to increase the temperature by the condenser 42.

[0112] In addition, the control unit 32 can set the flow channel opening rate of the first pipe 22 and the second pipe 24 to any value between 0 and 100%.

[0113] As described above, in the present embodiment, the carbon dioxide recovery system 1 comprises: a second heat pump device 40, wherein the second heat pump device 40 has an evaporator 41 and a condenser 42; a restriction unit 35, wherein the restriction unit 35 is disposed in the first pipe 22 for transmitting the airflow from the first blower 13 toward the evaporator 41 or the second pipe 24 for transmitting the airflow from the first blower 13 toward the condenser 42, and restricts at least a portion of the airflow generated by the first blower 13 from reaching the evaporator 41 or the condenser 42; and a control unit 32, wherein the control unit 32 controls the flow path opening rate of the restriction unit 35 to the first pipe 22 and the second pipe 24.

[0114] By controlling the flow passage opening rate of the first pipe 22 and the second pipe 24 by the restricting unit 35 according to the operation mode of the first heat pump device and the like, carbon dioxide can be collected more efficiently. Implementation method 7.

[0115] Next, the carbon dioxide recovery system 1 according to Embodiment 7 will be described. The basic structure of the carbon dioxide recovery system 1 according to this embodiment is the same as that of Embodiment 6, and therefore the description will be mainly focused on the differences.

[0116] Figure 7 It is a schematic diagram of the carbon dioxide recovery system 1 of the seventh embodiment.

[0117] like Figure 7 As shown, in the present embodiment, the carbon dioxide recovery system 1 further includes a heater 46 .

[0118] The heater 46 is disposed between the condenser 42 and the separation unit 23. The heater 46 further heats the air heated by the condenser 42 and supplies the air to the separation unit 23. This can further improve the recovery efficiency of carbon dioxide. Implementation method 8.

[0119] Next, the carbon dioxide recovery system 1 according to Embodiment 8 will be described. The basic structure of the carbon dioxide recovery system 1 according to this embodiment is the same as that of Embodiment 5, and therefore the description will be mainly focused on the differences.

[0120] Figure 8 It is a schematic diagram of the carbon dioxide recovery system 1 of the eighth embodiment.

[0121] like Figure 8 As shown, in the present embodiment, the carbon dioxide recovery system 1 includes a second heat pump device 60 instead of the second heat pump device 40 .

[0122] The second heat pump device 60 is provided between the first blower 13 and the recovery unit 21 and the separation unit 23. The second heat pump device 60 includes an evaporator 61, a first condenser 62, a second condenser 63, a compressor 64, a first regulating valve 65, and a second regulating valve 66.

[0123] The evaporator 61 is located between the first blower 13 and the joining portion 33 . The air from the first blower 13 and part of the air from the second blower 31 are cooled by the evaporator 61 and are then supplied to the joining portion 33 .

[0124] The second condenser 63 is located between the first blower 13 and the merging portion 33 . The air from the first blower 13 and the other part of the air from the second blower 31 are heated by the second condenser 63 and supplied to the merging portion 33 .

[0125] The merging portion 33 is disposed between the second heat pump device 60 and the recovery portion 21. The merging portion 33 mixes the air cooled by the evaporator 61 and the air heated by the second condenser 63, and supplies the mixed air to the recovery portion 21.

[0126] The first condenser 62 is located between the first blower 13 and the separation unit 23. The air from the first blower 13 is heated by passing through the first condenser 62 and is supplied to the separation unit 23.

[0127] The first regulating valve 65 is located between the evaporator 61 and the second condenser 63. The first regulating valve 65 is an expansion valve that expands the refrigerant.

[0128] The second regulating valve 66 is located between the first condenser 62 and the second condenser 63. The second regulating valve 66 regulates the amount of refrigerant flowing through the first condenser 62 and the second condenser 63. The controller 32 may control the second regulating valve 66 based on the measurement result of the temperature sensor provided at the junction 33.

[0129] As described above, the carbon dioxide recovery system 1 of the present embodiment includes the second heat pump device 60, which includes the evaporator 61, the first condenser 62, the second condenser 63, the first regulating valve 65 located between the evaporator 61 and the second condenser 63, and the second regulating valve 66 located between the first condenser 62 and the second condenser 63. The evaporator 61 and the second condenser 63 are located between the first blower 13 and the recovery unit 21, and the first condenser 62 is located between the first blower 13 and the separation unit 23.

[0130] The use of the evaporator 61 and the second condenser 63 makes it possible to more accurately adjust the temperature of the air supplied to the recovery unit 21. Therefore, the recovery efficiency of carbon dioxide is further improved. Implementation method 9.

[0131] Next, the carbon dioxide recovery system 1 according to Embodiment 9 will be described. The basic structure of the carbon dioxide recovery system 1 according to this embodiment is the same as that of Embodiment 8, and therefore the description will be mainly focused on the differences.

[0132] Fig. 9 It is a schematic diagram of the carbon dioxide recovery system 1 of the ninth embodiment.

[0133] like Fig. 9 As shown, in the present embodiment, the carbon dioxide recovery system 1 further includes a total heat exchanger 71 .

[0134] The total heat exchanger 71 is arranged on the upstream side of the second blower 31. The second blower 31 supplies the indoor air after passing through the total heat exchanger 71 to the recovery unit 21. Thus, the exhaust heat of the indoor air is recovered using the total heat exchanger 71 and then supplied to the recovery unit 21. Therefore, the energy efficiency of the system as a whole can be improved. Implementation method 10.

[0135] Next, the carbon dioxide recovery system 1 according to Embodiment 10 will be described. The basic structure of the carbon dioxide recovery system 1 according to this embodiment is the same as that of Embodiment 9, and therefore the description will be mainly focused on the differences.

[0136] Fig.10 This is a schematic diagram of the carbon dioxide recovery system 1 according to the tenth embodiment.

[0137] like Fig.10 As shown, in the present embodiment, the carbon dioxide recovery system 1 further includes a third heat pump device 80 , a carbon dioxide tank 85 , and a first supply path 86 .

[0138] The third heat pump device 80 is located downstream of the separation unit 23. The third heat pump device 80 includes an evaporator 81, a condenser (third condenser) 82, a compressor 83, and an expansion valve 84.

[0139] The gas containing high concentration of carbon dioxide discharged from the separation unit 23 passes through the evaporator 81 and is cooled. The carbon dioxide is thereby liquefied. The liquefied carbon dioxide is stored in the carbon dioxide tank 85 .

[0140] The condenser 82 heats the surrounding fluid (e.g., air, water). The first supply path 86 connects the condenser 82 to the second pipe 24. The fluid heated in the condenser 82 is supplied to the separation portion 23 via the first supply path 86 and the second pipe 24. In addition, the fluid heated in the condenser 82 may also be directly supplied to the separation portion 23 via the first supply path 86.

[0141] As described above, the carbon dioxide recovery system 1 of the present embodiment further includes the third heat pump device 80 that liquefies the carbon dioxide separated from the adsorbent in the separation unit 23 .

[0142] Thereby, the carbon dioxide separated in the separation unit 23 can be liquefied and stored at a low volume.

[0143] The carbon dioxide recovery system 1 of the present embodiment further includes a first supply path 86 for supplying the fluid heated in the condenser 82 of the third heat pump device 80 to the separation unit 23 .

[0144] Thus, the heat of the fluid heated in the condenser 82 can be used as a part of the heat source for separation of carbon dioxide. Therefore, the recovery efficiency of carbon dioxide can be further improved. Implementation method 11.

[0145] Next, the carbon dioxide recovery system 1 according to the eleventh embodiment will be described. The basic structure of the carbon dioxide recovery system 1 according to the present embodiment is the same as that of the tenth embodiment, and therefore the description will be mainly focused on the differences.

[0146] Fig.11 This is a schematic diagram of the carbon dioxide recovery system 1 according to the eleventh embodiment.

[0147] like Fig.11 As shown, in the present embodiment, the carbon dioxide recovery system 1 further includes a second supply path 88 .

[0148] The gas after the carbon dioxide is recovered is discharged from the recovery unit 21. The second supply path 88 connects the recovery unit 21 to the second pipe 24. The gas discharged from the recovery unit 21 is supplied to the separation unit 23 via the second supply path 88 and the second pipe 24. In addition, the gas discharged from the recovery unit 21 can also be directly supplied to the separation unit 23 via the second supply path 88.

[0149] As described above, the carbon dioxide recovery system 1 of the present embodiment further includes the second supply path 88 for supplying the gas exhausted from the recovery unit 21 to the separation unit 23 .

[0150] When the adsorbent adsorbs carbon dioxide in the recovery unit 21, adsorption heat is generated. By supplying the gas discharged from the recovery unit 21 to the separation unit 23, the adsorption heat can be used as a part of the heat source for separation of carbon dioxide. Therefore, the recovery efficiency of carbon dioxide can be further improved. Implementation method 12.

[0151] Next, the carbon dioxide recovery system 1 according to the twelfth embodiment will be described. The basic structure of the carbon dioxide recovery system 1 according to the present embodiment is the same as that of the tenth embodiment, and therefore the description will be mainly focused on the differences.

[0152] Fig.15 This is a schematic diagram of the carbon dioxide recovery system 1 according to the twelfth embodiment.

[0153] like Fig.15 As shown, in the present embodiment, the carbon dioxide recovery system 1 includes a liquefaction system 100 instead of the third heat pump device 80 .

[0154] The liquefaction system 100 includes a liquefaction heat exchanger 101, a compressor 103, and a scroll 104. The liquefaction system 100 liquefies the carbon dioxide separated from the adsorbent in the separation unit 23 using cold energy generated in the scroll 104. In addition, the liquefaction system 100 only needs to include at least one liquefaction heat exchanger 101, and may also include a plurality of liquefaction heat exchangers 101.

[0155] The compressor 103 supplies compressed gas obtained by compressing atmospheric air, dry air, or the like to the scroll 104 .

[0156] Fig.16 is a schematic diagram of the scroll 104 .

[0157] like Fig.16 As shown, the scroll 104 has a main body 104a, a cold air outlet 104b, a warm air outlet 104c, a compressed gas supply port 104d and a valve 104e.

[0158] The main body 104a has a cylindrical shape extending in the longitudinal direction. The cold air outlet 104b is provided at one end of the main body 104a in the longitudinal direction. The warm air outlet 104c is provided at the other end of the main body 104a in the longitudinal direction.

[0159] The compressed gas supply port 104d is provided on the side of the main body 104a. The compressed gas supply port 104d is provided close to the cold air outlet 104b. Compressed gas is supplied from the compressor 103 to the compressed gas supply port 104d. The compressed gas is introduced into the interior of the main body 104a from the compressed gas supply port 104d. The compressed gas supply port 104d is configured such that the compressed gas introduced from the compressed gas supply port 104d forms a swirling flow along the inner peripheral surface of the main body 104a inside the main body 104a.

[0160] The valve 104e is provided inside the main body 104a. The valve 104e is provided close to the heating outlet 104c. The valve 104e reduces the flow path area of ​​the swirl flow compared to the cross-sectional area of ​​the main body 104a. The valve 104e allows a part of the gas forming the swirl flow to be discharged from the heating outlet 104c and prevents the discharge of the remaining gas.

[0161] The operation of the scroll 104 will be described.

[0162] First, compressed gas is introduced from the compressor 103 to the compressed gas supply port 104d. The compressed gas forms an outer swirling flow Q along the inner circumferential surface of the main body 104a. The gas flows toward the warm air outlet 104c (valve 104e) while being pressed against the inner circumferential surface of the main body 104a. The temperature of the gas increases as it approaches the warm air outlet 104c. In addition, due to the centrifugal force of the swirl, the pressure near the inner circumferential surface of the main body 104a is higher than the pressure in the center of the main body 104a. Due to the pressure difference, the temperature of the gas flowing near the inner circumferential surface of the main body 104a is higher than the temperature of the gas flowing in the center of the main body 104a.

[0163] When the gas forming the outer swirl flow Q reaches the valve 104e, the gas in the gas that flows near the inner circumference of the main body 104a and becomes high temperature passes between the valve 104e and the inner circumference of the main body 104a, and is discharged from the warm air outlet 104c as a high-temperature first fluid F1. On the other hand, the gas flowing in the center of the main body 104a is prevented from being discharged by the valve 104e and moves toward the cold air outlet 104b on the opposite side. The gas forms an inner swirl flow P in the center of the main body 104a and flows toward the cold air outlet 104b. The temperature of the gas decreases as it moves toward the cold air outlet 104b. The gas that flows in the center of the main body 104a and becomes low temperature is discharged from the cold air outlet 104b as a low-temperature second fluid F2.

[0164] When the temperature of the compressed gas supplied from the compressed gas supply port 104d is set to T1, the temperature of the first fluid F1 discharged from the warm air outlet 104c is set to T2, and the temperature of the second fluid F2 discharged from the cold air outlet 104b is set to T3, T2>T1>T3.

[0165] That is, the scroll 104 causes the compressed gas introduced from the compressor 103 to rotate at high speed inside the main body 104a, and uses the swirling flow generated by the high-speed rotation and the pressure difference generated by the compression and expansion of the gas to separate the compressed gas into a high-temperature first fluid F1 (warm air) and a low-temperature second fluid F2 (cold air). By using the scroll 104, cold energy can be generated with a simple structure. In addition, the temperature and heat of the cold energy can be adjusted by, for example, the pressure, temperature, flow rate, and flow rate of the first fluid F1 and the second fluid F2 of the compressed gas supplied to the scroll 104. The flow rates of the first fluid F1 and the second fluid F2 can be adjusted by the valve 104e.

[0166] The second fluid F2 discharged from the cold air outlet 104b is supplied to the liquefaction heat exchanger 101. The liquefaction heat exchanger 101 cools and liquefies the carbon dioxide by exchanging heat between the second fluid F2 and the carbon dioxide separated from the adsorbent in the separation unit 23. The liquefied carbon dioxide is stored in the carbon dioxide tank 85.

[0167] like Fig.15 As shown, the first fluid F1 discharged from the warm air outlet 104c may be supplied to the separation unit 23 via the third supply path 105. In this case, the heat of the high-temperature first fluid F1 can be used as a part of the heat source for separation of carbon dioxide.

[0168] Alternatively, the second fluid F2 after heat exchange in the liquefaction heat exchanger 101 may be supplied to the recovery unit 21 via the fourth supply path 106. In this case, the energy of the compressed gas introduced into the scroll 104 can be reused as power for supplying air to the recovery unit 21.

[0169] In addition, the first fluid F1 may not be supplied to the separation unit 23 . The second fluid F2 may not be supplied to the recovery unit 21 .

[0170] As described above, the carbon dioxide recovery system 1 of the present embodiment further comprises: a vortex 104, which separates the compressed air into a first fluid F1 and a second fluid F2 having a lower temperature than the first fluid F1, and discharges the first fluid F1 and the second fluid F2 respectively; and a liquefaction heat exchanger 101, which liquefies the carbon dioxide by exchanging heat between the second fluid F2 and the carbon dioxide separated from the adsorbent in the separation section 23.

[0171] Thereby, the carbon dioxide separated in the separation unit 23 can be liquefied and stored at a low volume. In addition, the carbon dioxide can be liquefied with a simple structure.

[0172] Furthermore, the carbon dioxide recovery system 1 further includes a third supply path 105 for supplying the first fluid F1 discharged from the scroll 104 to the separation unit 23 .

[0173] Thus, the heat of the high-temperature first fluid F1 can be used as a part of the heat source for separation of carbon dioxide. Therefore, the recovery efficiency of carbon dioxide can be further improved.

[0174] In addition, the technical scope of the present disclosure is not limited to the above-mentioned embodiment, and various modifications can be added within the scope not departing from the gist of the present disclosure.

[0175] For example, in Embodiment 5, the merging portion 33 is disposed upstream of the evaporator 41 , but the present disclosure is not limited thereto. The merging portion 33 may be disposed downstream of the evaporator 41 .

[0176] In Embodiment 8, one evaporator 61 and one second condenser 63 are provided between the first blower 13 and the recovery unit 21, but the present disclosure is not limited thereto. Two or more evaporators or two or more condensers may be provided between the first blower 13 and the recovery unit 21.

[0177] In Embodiment 8, the second condenser 63 may be located between the evaporator 61 and the recovery unit 21 . In this case, the air dehumidified by the evaporator 61 is heated by the second condenser 63 and supplied to the recovery unit 21 .

[0178] Furthermore, the above-described embodiments and modifications may be combined as appropriate.

[0179] For example, the total heat exchanger 71 of the ninth embodiment may be provided in the carbon dioxide recovery system 1 of the first to eighth embodiments.

[0180] The third heat pump device 80 and the first supply path 86 of the tenth embodiment may also be provided in the carbon dioxide recovery system 1 of the first to eighth embodiments.

[0181] The second supply path 88 of the eleventh embodiment may also be provided in the carbon dioxide recovery system 1 of the first to ninth embodiments.

[0182] The liquefaction system 100 of the twelfth embodiment may be provided in the carbon dioxide recovery system 1 of the first to ninth embodiments.

[0183] In addition, the control unit 32 has a computer system inside. In addition, a program for realizing the functions of each structure of the carbon dioxide recovery system 1 may be recorded in a computer-readable recording medium, and the computer system may read and execute the program recorded in the recording medium, thereby performing the processing in the control unit 32. In addition, hardware other than the control unit 32 may also perform the above-mentioned processing.

[0184] Here, "causing a computer system to read and execute a program recorded in a recording medium" includes installing the program in the computer system. The "computer system" mentioned here includes an OS and hardware such as peripheral devices.

[0185] In addition, the "computer system" may also include a plurality of computer devices connected via a network including the Internet or a communication line such as a WAN, LAN, or a dedicated line. In addition, a "computer-readable recording medium" refers to a removable medium such as a floppy disk, a magneto-optical disk, a ROM, a CD-ROM, or a storage device such as a hard disk built into the computer system. In this way, the recording medium storing the program may also be a non-temporary recording medium such as a CD-ROM.

[0186] In addition, the recording medium also includes an internal or external recording medium that can be accessed from a distribution server in order to distribute the program. In addition, it is also possible to divide the program into multiple parts and combine the various structures possessed by the carbon dioxide recovery system 1 after downloading them at different time intervals. In addition, the distribution server for each of the divided programs may also be different. Moreover, the "computer-readable recording medium" also includes a recording medium that maintains the program for a certain period of time, such as a volatile memory (RAM) inside a computer system that becomes a server or client when the program is sent via a network. In addition, the above-mentioned program can also be used to implement a part of the above-mentioned functions. Moreover, it can also be a so-called differential file (differential program) that can implement the above-mentioned functions by combining with a program already recorded in a computer system. Description of Reference Numerals

[0187] 1…Carbon dioxide recovery system 10…Outdoor unit 12…Heat exchanger 13…First air blower 21…Recovery unit 22…First pipe 23…Separation unit 24…Second pipe 31…Second air blower 32…Control unit 35…Restriction unit 40, 60…Second heat pump device 41, 61…Evaporator 42…Condenser 46…Heater 62…First condenser 63…Second condenser 65…First regulating valve 66…Second regulating valve 71…Total heat exchanger 80…Third heat pump device 82…Condenser (third condenser) 86…First supply path 88…Second supply path 100…Liquidation system 101…Liquidation heat exchanger 104…Scroll 105…Third supply path.

Claims

1. A carbon dioxide recovery system, wherein: The carbon dioxide recovery system comprises: An outdoor unit of a first heat pump device, the outdoor unit having a heat exchanger and a first blower; a recovery unit having an adsorbent capable of adsorbing carbon dioxide and recovering carbon dioxide from air; and a separation unit that separates carbon dioxide from the adsorbent moved from the recovery unit, When the first heat pump device performs cooling operation, the first blower sends the airflow heated by the heat exchanger toward the separation portion.

2. The carbon dioxide recovery system according to claim 1, wherein: The first blower sends the airflow that has passed through the heat exchanger toward both the recovery section and the separation section.

3. The carbon dioxide recovery system according to claim 1 or 2, wherein: The carbon dioxide recovery system further includes a second blower configured to supply external air or indoor air that has not passed through the heat exchanger to the recovery unit.

4. The carbon dioxide recovery system according to claim 3, wherein: The carbon dioxide recovery system further includes a restriction unit provided between the first blower and the recovery unit and restricting the airflow heated by the heat exchanger from reaching the recovery unit.

5. The carbon dioxide recovery system according to any one of claims 1 to 4, wherein: The carbon dioxide recovery system further includes a second heat pump device, wherein the second heat pump device includes an evaporator and a condenser. The evaporator is located between the first blower and the recovery unit. The condenser is located between the first blower and the separation portion.

6. The carbon dioxide recovery system according to claim 3, wherein: The carbon dioxide recovery system further includes a second heat pump device, wherein the second heat pump device includes an evaporator and a condenser. The evaporator is located between the first blower and the recovery unit. The condenser is located between the first blower and the separation unit. The second air-sending device allows the outside air or the indoor air that has not passed through the heat exchanger to pass through the evaporator and supplies the air to the recovery unit.

7. The carbon dioxide recovery system according to claim 6, wherein: The carbon dioxide recovery system further includes a restriction unit configured to restrict the airflow heated by the heat exchanger from reaching the evaporator when the first heat pump device performs cooling operation.

8. The carbon dioxide recovery system according to any one of claims 5 to 7, wherein: The carbon dioxide recovery system further includes a heater disposed between the condenser and the separation unit.

9. The carbon dioxide recovery system according to any one of claims 5 to 8, wherein: The second heat pump device is a transcritical heat pump cycle in which the refrigerant operates at a pressure higher than a critical pressure.

10. The carbon dioxide recovery system according to claim 9, wherein: The second heat pump device uses a refrigerant containing carbon dioxide as a main component as a working fluid.

11. The carbon dioxide recovery system according to any one of claims 5 to 10, wherein: The second heat pump device uses a non-azeotropic mixed refrigerant as a working fluid.

12. The carbon dioxide recovery system according to any one of claims 5 to 11, wherein: When the first heat pump device performs heating operation, the first blower supplies the airflow cooled by the heat exchanger to the recovery unit through the evaporator and supplies the airflow to the separation unit through the condenser.

13. The carbon dioxide recovery system according to claim 12, wherein: The carbon dioxide recovery system includes a second blower configured to supply external air or indoor air that has not passed through the heat exchanger to the recovery unit. When the first heat pump device performs a heating operation, the airflow generated by the first blower is mixed with the outside air or the indoor air blown by the second blower to increase the temperature and is supplied to the recovery unit.

14. The carbon dioxide recovery system according to any one of claims 5 to 11, wherein: The carbon dioxide recovery system also has: a restriction portion, the restriction portion being provided in a first duct transmitting airflow from the first blower toward the evaporator or a second duct transmitting airflow from the first blower toward the condenser, and restricting at least a portion of the airflow generated by the first blower from reaching the evaporator or the condenser; and A control unit controls a flow channel opening rate of the restriction unit with respect to the first pipe and the second pipe.

15. The carbon dioxide recovery system according to any one of claims 1 to 4, wherein: The carbon dioxide recovery system includes a second heat pump device, the second heat pump device having an evaporator, a first condenser, a second condenser, a first regulating valve located between the evaporator and the second condenser, and a second regulating valve located between the first condenser and the second condenser. The evaporator and the second condenser are located between the first blower and the recovery unit. The first condenser is located between the first blower and the separation portion.

16. The carbon dioxide recovery system according to any one of claims 1 to 15, wherein: The carbon dioxide recovery system also has: Total heat exchanger; and A second air blower is provided for supplying the indoor air after passing through the total heat exchanger to the recovery unit.

17. The carbon dioxide recovery system according to any one of claims 1 to 16, wherein: The carbon dioxide recovery system further includes a third heat pump device that liquefies the carbon dioxide separated from the adsorbent in the separation unit.

18. The carbon dioxide recovery system according to claim 17, wherein: The carbon dioxide recovery system further includes a first supply path that supplies the fluid heated in the third condenser of the third heat pump device to the separation unit.

19. The carbon dioxide recovery system according to any one of claims 1 to 18, wherein: The carbon dioxide recovery system further includes a second supply path configured to supply the gas exhausted from the recovery unit to the separation unit.

20. The carbon dioxide recovery system according to any one of claims 1 to 16, wherein: The carbon dioxide recovery system also has: A scroll tube, wherein the scroll tube separates the compressed air into a first fluid and a second fluid having a lower temperature than the first fluid, and discharges the first fluid and the second fluid respectively; as well as A liquefaction heat exchanger liquefies the carbon dioxide by exchanging heat between the second fluid and the carbon dioxide separated from the adsorbent in the separation section.

21. The carbon dioxide recovery system according to claim 20, wherein: The carbon dioxide recovery system further includes a third supply path configured to supply the first fluid discharged from the scroll to the separation unit.

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