Carbon dioxide recovery system

Abstract

A carbon dioxide recovery system according to the present disclosure comprises: an adsorption unit that recovers carbon dioxide in air using an adsorbent; a transport unit that transports air in an indoor space to the adsorption unit; a heat recovery unit that recovers heat from the air; a separation unit that separates the carbon dioxide from the adsorbent; a first path that extends from the indoor space to the adsorption unit via the heat recovery unit; a second path that extends from the indoor space to the adsorption unit without passing through the heat recovery unit; a switching valve that switches the transport path of the air between the first path and the second path; and a control unit that controls the switching valve.

Description

Carbon dioxide capture system

[0001] This disclosure relates to a carbon dioxide capture system. This application claims priority to Japanese Patent Application No. 2024-101614, filed on June 25, 2024, the contents of which are incorporated herein by reference.

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

[0003] Japanese Patent Application Publication No. 2020-131166

[0004] In the configuration of Patent Document 1, carbon dioxide is captured from outside air with a low carbon dioxide concentration, so the efficiency of carbon dioxide capture by the adsorbent is low, and the cost of carbon dioxide capture is high.

[0005] In view of the above circumstances, the present disclosure aims to provide a carbon dioxide capture system that can reduce the cost of capturing carbon dioxide.

[0006] The carbon dioxide capture system according to the present disclosure comprises an adsorption unit that captures carbon dioxide in the air using an adsorbent, a transport unit that transports indoor air to the adsorption unit, a heat recovery unit that recovers heat from the air, a separation unit that separates carbon dioxide from the adsorbent, a first path from the indoors to the adsorption unit via the heat recovery unit, a second path from the indoors to the adsorption unit without passing through the heat recovery unit, a switching valve that switches the air transport path between the first path and the second path, and a control unit that controls the switching valve.

[0007] According to the present disclosure, it is possible to provide a carbon dioxide capture system that can reduce the cost of capturing carbon dioxide.

[0008] Fig. 1 is a schematic diagram showing a carbon dioxide capture system according to embodiment 1. Fig. 2 is a schematic diagram showing a carbon dioxide capture system according to embodiment 2. Fig. 3 is a schematic diagram showing a carbon dioxide capture system according to embodiment 3. Fig. 4 is a schematic diagram showing a carbon dioxide capture system according to embodiment 4.

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the scope of the present disclosure is not limited to the following embodiments and can be modified as desired within the scope of the technical concept of the present disclosure.

[0010] Embodiment 1. Fig. 1 is a schematic diagram showing a carbon dioxide capture system 1 according to embodiment 1. As shown in Fig. 1, the carbon dioxide capture system 1 includes an adsorption unit 2, a transport unit 3, a heat recovery unit 4, a separation unit 5, a switching valve 6, a control unit 7, a first temperature detection unit 8, and a second temperature detection unit 9. The carbon dioxide capture system 1 also includes an inside air transport path 11, an outside air transport path 14 (third path), and an adsorbent movement path 15.

[0011] The room air conveying path 11 is connected to the adsorption unit 2. The room air conveying path 11 guides indoor air to the adsorption unit 2. The room air conveying path 11 has a first path 12 and a second path 13. The first path 12 leads from the room to the adsorption unit 2 via the heat recovery unit 4. The second path 13 leads from the room to the adsorption unit 2 without passing through the heat recovery unit 4. The room air conveying path 11 is provided with a switching valve 6 that switches the indoor air conveying path between the first path 12 and the second path 13.

[0012] The conveying unit 3 is provided in the indoor air conveying path 11. The conveying unit 3 conveys indoor air to the adsorption unit 2. The conveying unit 3 is, for example, a blower. In the illustrated example, the conveying unit 3 is provided between the indoor space and the switching valve 6. In this case, a single conveying unit 3 can be used to convey indoor air to the adsorption unit 2 in both the first path 12 and the second path 13. Note that separate conveying units 3 may be provided for the first path 12 and the second path 13. In this case, for the first path 12, the conveying unit 3 may be provided in the heat recovery unit 4. For the second path 13, the conveying unit 3 may be provided in the second path 13 between the switching valve 6 and the adsorption unit 2.

[0013] The adsorption unit 2 recovers carbon dioxide from the air using an adsorbent. The adsorbent contains a material capable of adsorbing carbon dioxide. Examples of materials capable of adsorbing carbon dioxide include amine, zeolite, silica gel, diatomaceous earth, alumina, and activated carbon. A plurality of materials may be selected from the above, or materials other than those listed above may be used. The adsorbent may be in a granular form (e.g., bead-like (spherical) or pellet-like (cylindrical)). Alternatively, a powdered adsorbent may be used. In this case, the powdered adsorbent may be supported on the surface of a substrate. The substrate may be, for example, honeycomb-shaped. For example, the powdered adsorbent may be supported on a honeycomb rotor. The adsorbent may be a liquid adsorption liquid.

[0014] The adsorption unit 2 is disposed outdoors. In this embodiment, the adsorption unit 2 is provided in the outdoor unit 100 of the air conditioner. The adsorption unit 2 is configured to be able to hold an adsorbent at a position that receives the airflow generated by the blower of the outdoor unit 100. The adsorption unit 2 may have, for example, a container that is capable of accommodating the adsorbent and that is breathable. The adsorbent held in the adsorption unit 2 is hit by the airflow generated by driving the blower of the outdoor unit 100. The adsorption unit 2 brings the adsorbent into contact with outside air transported by the blower of the outdoor unit 100, thereby adsorbing carbon dioxide into the adsorbent. Note that the device in which the adsorption unit 2 is provided may be any device that can generate an airflow, and is not limited to the outdoor unit 100. For example, the adsorption unit 2 may be provided in a ventilation fan or the like.

[0015] The adsorption unit 2 is configured so that the airflow of indoor air transported from the indoor air transport path 11 hits the adsorbent held in the adsorption unit 2. The adsorption unit 2 brings the indoor air transported from the indoor air transport path 11 into contact with the adsorbent, causing carbon dioxide to be adsorbed by the adsorbent. That is, the adsorption unit 2 uses the indoor air transported via the indoor air transport path 11 to capture carbon dioxide. Indoor air contains the exhaled breath of indoor users, and therefore has a higher carbon dioxide concentration than outdoor air. For example, the carbon dioxide concentration of outdoor air is approximately 410 ppm, while the carbon dioxide concentration of indoor air is approximately 1000 ppm. By using indoor air with a high carbon dioxide concentration to capture carbon dioxide, the carbon dioxide capture efficiency is improved and the carbon dioxide capture cost can be reduced.

[0016] The outside air transport path 14 is connected to the separation unit 5. The outside air transport path 14 leads from the outdoors to the separation unit 5 via the heat recovery unit 4. The outside air transport path 14 guides outside air to the separation unit 5 via the heat recovery unit 4. The outside air transport path 14 may be provided with a second transport unit (not shown) that transports the outside air to the separation unit 5. The second transport unit may be provided in the heat recovery unit 4.

[0017] The first temperature detector 8 detects the temperature of the indoor air. The first temperature detector 8 is provided in the indoor air conveying path 11 between the indoor space and the switching valve 6. The first temperature detector 8 may also be provided indoors. The detection result of the first temperature detector 8 is output to the control unit 7.

[0018] The second temperature detector 9 detects the temperature of the outside air. The second temperature detector 9 is provided on the outside air transfer path 14, upstream of the heat recovery unit 4. The detection result of the second temperature detector 9 is output to the control unit 7.

[0019] The control unit 7 controls the switching valve 6 based on the detection results of the first temperature detection unit 8 and the second temperature detection unit 9. Specifically, the control unit 7 controls the switching valve 6 to switch the indoor air transport path to the first path 12 when the temperature detected by the first temperature detection unit 8 (the indoor air temperature) is higher than the temperature detected by the second temperature detection unit 9 (the outside air temperature). Furthermore, the control unit 7 controls the switching valve 6 to switch the indoor air transport path to the second path 13 when the temperature detected by the first temperature detection unit 8 (the indoor air temperature) is equal to or lower than the temperature detected by the second temperature detection unit 9 (the outside air temperature).

[0020] The heat recovery unit 4 recovers heat from indoor air. The heat recovery unit 4 is installed outdoors. However, the heat recovery unit 4 may also be installed indoors.

[0021] Specifically, in the heat recovery unit 4, the first path 12 of the indoor air transport path 11 and the outdoor air transport path 14 intersect, and heat exchange occurs between the indoor air flowing through the first path 12 and the outdoor air flowing through the outdoor air transport path 14. Note that in the heat recovery unit 4, the indoor air flowing through the first path 12 and the outdoor air flowing through the outdoor air transport path 14 only exchange heat and are not mixed.

[0022] As described above, the control unit 7 controls the switching valve 6 to switch the air transport path to the first path 12 when the temperature of the indoor air is higher than the temperature of the outdoor air. Therefore, the indoor air passes through the heat recovery unit 4 (first path 12) only when the temperature of the indoor air is higher than the temperature of the outdoor air. That is, in the heat recovery unit 4, the temperature of the indoor air circulating through the first path 12 is higher than the temperature of the outdoor air circulating through the outdoor air transport path 14. The heat recovery unit 4 recovers heat from the indoor air circulating through the first path 12 by heat exchange between the indoor air circulating through the first path 12 and the outdoor air circulating through the outdoor air transport path 14, and transfers the heat to the outdoor air circulating through the outdoor air transport path 14. Therefore, the temperature of the outdoor air circulating through the outdoor air transport path 14 increases as the air passes through the heat recovery unit 4.

[0023] The separation unit 5 separates carbon dioxide from the adsorbent that has adsorbed carbon dioxide in the adsorption unit 2. The separation unit 5 separates carbon dioxide from the adsorbent by heating the adsorbent that has adsorbed carbon dioxide. The separation unit 5 is configured to be able to hold the adsorbent at a position that receives the flow of outside air transported from the outside air transport path 14. The adsorbent held in the separation unit 5 is heated when the flow of outside air, whose temperature has increased by passing through the heat recovery unit 4, hits the adsorbent. In other words, the heat recovered in the heat recovery unit 4 is supplied to the separation unit 5 via the outside air transport path 14. The separation unit 5 uses the heat recovered in the heat recovery unit 4 to separate carbon dioxide. The separation unit 5 may further include a heating device for heating the adsorbent.

[0024] The separation unit 5 is located outdoors. The adsorption unit 2 and the separation unit 5 are provided at a distance from each other. An adsorbent transfer path 15 is provided between the adsorption unit 2 and the separation unit 5. The adsorbent transfer path 15 transfers the adsorbent between the adsorption unit 2 and the separation unit 5. The adsorbent transfer path 15 has, for example, two pipes connecting the adsorption unit 2 and the separation unit 5. The adsorbent that has adsorbed carbon dioxide in the adsorption unit 2 transfers from the adsorption unit 2 to the separation unit 5 via one pipe. The adsorbent from which carbon dioxide has been separated in the separation unit 5 transfers from the separation unit 5 to the adsorption unit 2 via the other pipe.

[0025] As described above, the carbon dioxide capture system 1 according to this embodiment comprises an adsorption unit 2 that captures carbon dioxide in the air using an adsorbent, a transport unit 3 that transports indoor air to the adsorption unit 2, a heat recovery unit 4 that recovers heat from the air, a separation unit 5 that separates carbon dioxide from the adsorbent, a first path 12 that runs from the indoors to the adsorption unit 2 via the heat recovery unit 4, a second path 13 that runs from the indoors to the adsorption unit 2 without passing through the heat recovery unit 4, a switching valve 6 that switches the air transport path between the first path 12 and the second path 13, and a control unit 7 that controls the switching valve 6.

[0026] According to this carbon dioxide capture system 1, the adsorption unit 2 can use indoor air with a high carbon dioxide concentration transported via the first path 12 or the second path 13 to capture carbon dioxide. This improves the carbon dioxide capture efficiency and reduces the carbon dioxide capture cost. Furthermore, for example, when air that has passed through the adsorption unit 2 is taken back into the room, the carbon dioxide concentration in the indoor air can be reduced, which allows the ventilation airflow to be reduced and the air conditioning load to be reduced.

[0027] The carbon dioxide recovery system 1 also includes an outside air transport path 14 that runs from outdoors to the separation part 5 via the heat recovery part 4. According to this configuration, the heat recovered in the heat recovery part 4 can be supplied to the separation part 5 via the outside air transport path 14 and used for separating carbon dioxide in the separation part 5. Therefore, the energy required for separating carbon dioxide can be reduced, and the cost of recovering carbon dioxide can be further reduced.

[0028] The carbon dioxide capture system 1 also includes a first temperature detection unit 8 that detects the temperature of the indoor air. The control unit 7 controls the switching valve 6 based on the detection result of the first temperature detection unit 8. According to this configuration, by switching the air transport path between the first path 12 and the second path 13 based on the indoor air temperature, heat can be efficiently recovered in the heat recovery unit 4.

[0029] The carbon dioxide capture system 1 also includes a second temperature detection unit 9 that detects the temperature of the outside air. The control unit 7 controls the switching valve 6 to switch to the first path 12 when the temperature detected by the first temperature detection unit 8 is higher than the temperature detected by the second temperature detection unit 9. With this configuration, when the temperature of the indoor air is higher than the temperature of the outside air, air is transported from the indoors to the adsorption unit 2 via the heat recovery unit 4, thereby enabling efficient heat recovery in the heat recovery unit 4. Furthermore, when the temperature of the indoor air is equal to or lower than the temperature of the outside air, air is transported from the indoors to the adsorption unit 2 without passing through the heat recovery unit 4, thereby reducing the energy required to transport the air.

[0030] Furthermore, the heat recovery unit 4 is installed outdoors. This configuration makes it easy to install and maintain the heat recovery unit 4, and reduces the cost of the entire system.

[0031] The adsorption unit 2 and the separation unit 5 are also provided at a distance from each other. The carbon dioxide capture system 1 is provided with an adsorbent transfer path 15 that transfers the adsorbent between the adsorption unit 2 and the separation unit 5. With this configuration, the adsorption unit 2 and the separation unit 5 are provided at a distance from each other, which makes it possible to suppress the heat from the separation unit 5 from being transmitted to the adsorption unit 2. Therefore, a temperature rise in the adsorption unit 2 can be suppressed, and a decrease in the adsorption efficiency of the adsorption unit 2 due to a temperature rise in the adsorption unit 2 can be suppressed. Furthermore, a temperature drop in the separation unit 5 can be suppressed, and a decrease in the separation efficiency of the separation unit 5 due to a temperature drop in the separation unit 5 can be suppressed. Furthermore, when the adsorption unit 2 is provided in the outdoor unit 100, providing the adsorption unit 2 and the separation unit 5 at a distance from each other also makes it possible to suppress the heat from the separation unit 5 from being transmitted to the outdoor unit 100. Therefore, a temperature rise in the outdoor unit 100 can be suppressed, and a decrease in the air conditioning performance of an air conditioner equipped with the outdoor unit 100 due to a temperature rise in the outdoor unit 100 can be suppressed.

[0032] Second Embodiment Next, a carbon dioxide capture system according to a second embodiment will be described with reference to Fig. 2. The carbon dioxide capture system according to this embodiment has the same basic configuration as that of the first embodiment, and therefore differences will be mainly described.

[0033] In this embodiment, the carbon dioxide recovery system 1A further includes a renewable energy heat supply unit 21. The renewable energy heat supply unit 21 is provided between the heat recovery unit 4 and the separation unit 5 in the outside air transport path 14. The renewable energy heat supply unit 21 supplies renewable energy heat to the outside air that has passed through the heat recovery unit 4. Renewable energy heat includes, for example, solar heat and geothermal heat. Renewable energy heat includes waste heat generated when power generated by solar heat, geothermal heat, or wind is used to operate external equipment such as a heat pump. In other words, the renewable energy heat supply unit 21 heats the outside air that has passed through the heat recovery unit 4 using at least one of solar heat, geothermal heat, and waste heat generated when power generated by solar heat, geothermal heat, or wind is used to operate external equipment.

[0034] As described above, the carbon dioxide recovery system 1A according to this embodiment includes the renewable energy heat supply unit 21, which is provided between the heat recovery unit 4 and the separation unit 5 in the outside air transport path 14 and supplies renewable energy heat to the air that has passed through the heat recovery unit 4. According to this configuration, the renewable energy heat can be used to separate carbon dioxide in the separation unit 5. Therefore, the cost of recovering carbon dioxide can be further reduced.

[0035] Third Embodiment Next, a carbon dioxide capture system according to a third embodiment will be described with reference to Fig. 3. The carbon dioxide capture system according to this embodiment has the same basic configuration as that of the second embodiment, and therefore differences will be mainly described.

[0036] In the present embodiment, the carbon dioxide recovery system 1B further includes a waste heat supply unit 22. The waste heat supply unit 22 is provided between the heat recovery unit 4 and the separation unit 5 in the outside air transport path 14. In the illustrated example, the waste heat supply unit 22 is provided downstream of the renewable energy heat supply unit 21 in the outside air transport path 14. The waste heat supply unit 22 may also be provided upstream of the renewable energy heat supply unit 21 in the outside air transport path 14.

[0037] The waste heat supply unit 22 supplies waste heat from the heat pump to the outdoor air that has passed through the heat recovery unit 4. The heat pump may be, for example, the outdoor unit 100 in which the adsorption unit 2 is provided, or an indoor unit that is paired with the outdoor unit 100. The heat pump may be an air conditioner different from the air conditioner that includes the outdoor unit 100. The heat pump may be a water heater. The waste heat supply unit 22 uses the waste heat from the heat pump to heat the outdoor air that has passed through the heat recovery unit 4.

[0038] As described above, the carbon dioxide recovery system 1B according to this embodiment includes the waste heat supply unit 22, which is provided between the heat recovery unit 4 and the separation unit 5 in the outside air transfer path 14 and supplies waste heat from the heat pump to the air that has passed through the heat recovery unit 4. With this configuration, the waste heat from the heat pump can be used to separate carbon dioxide in the separation unit 5. Therefore, the cost of recovering carbon dioxide can be further reduced.

[0039] Fourth Embodiment Next, a carbon dioxide capture system according to a fourth embodiment will be described with reference to Fig. 4. The carbon dioxide capture system according to this embodiment has the same basic configuration as that of the third embodiment, and therefore differences will be mainly described.

[0040] In the present embodiment, the carbon dioxide recovery system 1C further includes a heater 23. The heater 23 is provided in the outside air transport path 14 between the heat recovery unit 4 and the separation unit 5. In the illustrated example, the heater 23 is provided in the outside air transport path 14 downstream of the renewable energy heat supply unit 21 and the waste heat supply unit 22. The heater 23 may be provided in the outside air transport path 14 upstream of the renewable energy heat supply unit 21 and the waste heat supply unit 22, or may be provided between the renewable energy heat supply unit 21 and the waste heat supply unit 22. The heater 23 heats the outside air that has passed through the heat recovery unit 4. By providing the heater 23, for example, even if the amount of heat supplied from the heat recovery unit 4, the renewable energy heat supply unit 21, and the waste heat supply unit 22 is insufficient for separating carbon dioxide in the separation unit 5, the shortage of heat can be compensated for.

[0041] As described above, the carbon dioxide recovery system 1C according to this embodiment includes the heater 23, which is provided in the outside air transfer path 14 between the heat recovery unit 4 and the separation unit 5 and heats the air that has passed through the heat recovery unit 4. According to this configuration, the heater 23 can be used to reliably heat the air that is transferred to the separation unit 5. Therefore, the cost of recovering carbon dioxide can be reduced.

[0042] The technical scope of the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present disclosure.

[0043] For example, in the above embodiment, the adsorption unit 2 is provided in the outdoor unit 100 of the air conditioner. However, the adsorption unit 2 need not be provided in the outdoor unit 100 as long as it is configured so that indoor air transported from the indoor air transport path 11 comes into contact with the adsorbent held in the adsorption unit 2. If the adsorption unit 2 is provided in the outdoor unit 100, the adsorption unit 2 can use both the outside air transported by the blower of the outdoor unit 100 and the indoor air with a high carbon dioxide concentration transported via the indoor air transport path 11 to capture carbon dioxide.

[0044] The transfer unit 3, the heat recovery unit 4, the switching valve 6, and the control unit 7 may be located indoors or outdoors. When the transfer unit 3, the heat recovery unit 4, the switching valve 6, and the control unit 7 are all located outdoors, maintainability is improved.

[0045] Furthermore, in the third embodiment, the carbon dioxide recovery system 1B may not have the renewable energy heat supply unit 21, and may have only the waste heat supply unit 22. In the fourth embodiment, the carbon dioxide recovery system 1C may not have the renewable energy heat supply unit 21 and the waste heat supply unit 22, and may have only the heater 23. The carbon dioxide recovery system 1C may not have the waste heat supply unit 22, and may have only the renewable energy heat supply unit 21 and the heater 23. The carbon dioxide recovery system 1C may not have the renewable energy heat supply unit 21, and may have only the waste heat supply unit 22 and the heater 23.

[0046] The above-mentioned control unit 7 has an internal computer system. A program for realizing the functions of each component included in the above-mentioned carbon dioxide capture systems 1, 1A, 1B, and 1C may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into and executed by the computer system to perform the processing in the above-mentioned control unit 7. Furthermore, hardware other than the control unit 7 may perform the above-mentioned processing.

[0047] Here, "loading a program recorded on a recording medium into a computer system and executing it" includes installing the program into a computer system. The "computer system" here includes the OS and hardware such as peripheral devices.

[0048] Furthermore, a "computer system" may include multiple computer devices connected via a network including the Internet or communication lines such as a WAN, LAN, or dedicated line. Furthermore, a "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, as well as storage devices such as hard disks built into a computer system. Thus, the recording medium storing the program may be a non-transitory recording medium such as a CD-ROM.

[0049] The recording medium also includes internal or external recording media accessible from a distribution server for distributing the program. The program may be divided into multiple parts, downloaded at different times, and then combined in each component of the carbon dioxide capture systems 1, 1A, 1B, and 1C. Each divided program may be distributed by a different distribution server. Furthermore, the term "computer-readable recording medium" also includes a storage medium that stores a program for a certain period of time, such as volatile memory (RAM) within a computer system that serves as a server or client when a program is transmitted over a network. The program may also be a storage medium for implementing part of the above-described functions. Furthermore, the program may be a so-called differential file (differential program) that can realize the above-described functions in combination with a program already stored in the computer system.

[0050] Note that all or part of the functions of the control unit 7 may be realized using hardware such as an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array).

[0051] In addition, the above-described embodiments and modifications may be combined as appropriate.

[0052] REFERENCE SIGNS LIST 1, 1A, 1B, 1C Carbon dioxide recovery system 2 Adsorption section 3 Transport section 4 Heat recovery section 5 Separation section 6 Switching valve 7 Control section 8 First temperature detection section 9 Second temperature detection section 11 Inside air transport path 12 First path 13 Second path 14 Outside air transport path (third path) 15 Adsorbent movement path 21 Renewable energy heat supply section 22 Waste heat supply section 23 Heater

Claims

1. A carbon dioxide recovery system comprising: an adsorption unit that recovers carbon dioxide in the air using an adsorbent; a transport unit that transports indoor air to the adsorption unit; a heat recovery unit that recovers heat from the air; a separation unit that separates carbon dioxide from the adsorbent; a first path that runs from the indoors to the adsorption unit via the heat recovery unit; a second path that runs from the indoors to the adsorption unit without passing through the heat recovery unit; a switching valve that switches the air transport path between the first path and the second path; and a control unit that controls the switching valve.

2. The carbon dioxide capture system according to claim 1, further comprising a third path extending from the outdoors through the heat recovery section to the separation section.

3. A carbon dioxide capture system as described in claim 1 or 2, further comprising a first temperature detection unit that detects the temperature of indoor air, and the control unit controls the switching valve based on the detection result of the first temperature detection unit.

4. A carbon dioxide capture system as described in claim 3, further comprising a second temperature detection unit that detects the temperature of outside air, and wherein the control unit controls the switching valve to switch to the first path when the temperature detected by the first temperature detection unit is higher than the temperature detected by the second temperature detection unit.

5. A carbon dioxide recovery system as described in any one of claims 1 to 4, further comprising: a third path leading from outdoors to the separation part via the heat recovery part; and a renewable energy heat supply part provided in the third path between the heat recovery part and the separation part, which supplies renewable energy heat to air that has passed through the heat recovery part.

6. The carbon dioxide recovery system described in claim 5, wherein the renewable energy heat supply unit uses at least one of solar heat, geothermal heat, and waste heat generated when power generated by solar heat, geothermal heat, or wind is used to operate external equipment.

7. A carbon dioxide recovery system as described in any one of claims 1 to 6, comprising: a third path leading from outdoors to the separation part via the heat recovery part; and a waste heat supply part provided in the third path between the heat recovery part and the separation part, which supplies waste heat from a heat pump to air that has passed through the heat recovery part.

8. A carbon dioxide recovery system as described in any one of claims 1 to 7, comprising: a third path leading from outdoors to the separation part via the heat recovery part; and a heater provided in the third path between the heat recovery part and the separation part, for heating air that has passed through the heat recovery part.

9. The carbon dioxide recovery system according to any one of claims 1 to 8, wherein the heat recovery unit is installed outdoors.

10. A carbon dioxide capture system according to any one of claims 1 to 9, wherein the adsorption section and the separation section are provided at a distance from each other, and an adsorbent transfer path is provided for transferring the adsorbent between the adsorption section and the separation section.

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