Carbon dioxide recovery device and carbon dioxide recovery method

Abstract

This carbon dioxide recovery device, which recovers carbon dioxide contained in air flowing through at least one of a first air flow path and a second air flow path, is provided with: an adsorbent that adsorbs carbon dioxide; a separation unit that separates the carbon dioxide adsorbed on the adsorbent; a measurement unit that measures a parameter in the air that contributes to the adsorption efficiency of the adsorbent with respect to carbon dioxide; a first transport path that transports the adsorbent via the first air flow path and the separation unit; a second transport path that transports the adsorbent via the second air flow path and the separation unit; a switching unit that switches between a state in which the adsorbent is conveyed through the first conveyance path, a state in which the adsorbent is conveyed through the second conveyance path, and a state in which the adsorbent is conveyed through both the first conveyance path and the second conveyance path; a control unit that controls the switching unit on the basis of the measurement result of the measurement unit; and a recovery unit that recovers the carbon dioxide separated by the separation unit.

Description

Technical Field

[0001] The present disclosure relates to a carbon dioxide recovery device and a carbon dioxide recovery method. Background Art

[0002] Patent Document 1 discloses a technique 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. 2021-169079 Summary of the invention

[0006] Problems to be solved by the invention

[0007] It is required to efficiently recover carbon dioxide through adsorbents.

[0008] In view of the above situation, an object of the present disclosure is to provide a carbon dioxide recovery device and a carbon dioxide recovery method that can efficiently recover carbon dioxide.

[0009] Means for solving problems

[0010] One embodiment of the carbon dioxide recovery device disclosed herein is a carbon dioxide recovery device that recovers carbon dioxide contained in air circulating in at least one of a first air flow path and a second air flow path, wherein the carbon dioxide recovery device comprises: an adsorbent that adsorbs carbon dioxide; a separation unit that separates the carbon dioxide adsorbed on the adsorbent; a measuring unit that measures a parameter in the air that contributes to the adsorption efficiency of the adsorbent on carbon dioxide; a first conveying path that conveys the adsorbent via the first air flow path and the separation unit; a second conveying path that conveys the adsorbent via the second air flow path and the separation unit; a switching unit that switches between a state in which the adsorbent is conveyed through the first conveying path, a state in which the adsorbent is conveyed through the second conveying path, and a state in which the adsorbent is conveyed through both the first conveying path and the second conveying path; a control unit that controls the switching unit based on a measurement result of the measuring unit; and a recovery unit that recovers the carbon dioxide separated by the separation unit.

[0011] One aspect of the carbon dioxide recovery method disclosed herein is a carbon dioxide recovery method, which uses an adsorbent that adsorbs carbon dioxide to recover carbon dioxide contained in air flowing through at least one of a first air flow path and a second air flow path, wherein the carbon dioxide recovery method comprises: a switching process, in which, based on the measurement result of a parameter in the air that contributes to the adsorption efficiency of carbon dioxide by the adsorbent, the conveying path of the adsorbent is switched between a state in which the adsorbent is conveyed through a first conveying path via the first air flow path, a state in which the adsorbent is conveyed through a second conveying path via the second air flow path, and a state in which the adsorbent is conveyed through both the first conveying path and the second conveying path; an adsorption process, in which, the adsorbent is conveyed through the conveying path switched in the switching process, so that the air flowing through at least one of the air flow paths contacts the adsorbent, so that the adsorbent adsorbs carbon dioxide; a separation process, in which the carbon dioxide is separated from the adsorbent that adsorbed carbon dioxide in the adsorption process; and a recovery process, in which the carbon dioxide separated in the separation process is recovered.

[0012] Effects of the Invention

[0013] According to the present disclosure, a carbon dioxide recovery device and a carbon dioxide recovery method capable of efficiently recovering carbon dioxide can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the carbon dioxide recovery system of embodiment 1.

[0015] Figure 2 This is a flowchart illustrating the switching process of the carbon dioxide recovery method according to the first embodiment.

[0016] Figure 3 This is a flowchart illustrating the switching process of the carbon dioxide recovery method according to the first embodiment.

[0017] Figure 4 This is a schematic diagram of a carbon dioxide recovery system according to Embodiment 2.

[0018] Figure 5 This is a schematic diagram of a carbon dioxide recovery system according to Embodiment 3.

[0019] Figure 6 This is a schematic diagram of a carbon dioxide recovery system in Embodiment 4.

[0020] Figure 7 This is a schematic diagram of a carbon dioxide recovery system in embodiment 5. DETAILED DESCRIPTION

[0021] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be noted that the scope of the present disclosure is not limited to the following embodiments, and any changes can be made within the scope of the technical concept of the present disclosure.

[0022] Implementation method 1.

[0023] Figure 1 1 is a schematic diagram showing a carbon dioxide recovery system 1 including a carbon dioxide recovery device 10 according to the first embodiment.

[0024] like Figure 1 As shown, the carbon dioxide recovery system 1 includes a carbon dioxide recovery device 10, an outdoor unit 21 and an indoor unit 22 of an air conditioner.

[0025] The outdoor unit 21 is installed outdoors and includes: a first air flow path 21b formed in the outdoor unit 21, a first air intake port 21a for introducing air into the first air flow path 21b, a first air outlet 21c for blowing out the air flowing in the first air flow path 21b, and a first blower 21d for forming the air flow in the first air flow path 21b.

[0026] The indoor unit 22 is installed indoors. The indoor unit 22 includes: a second air flow path 22b formed in the indoor unit 22, a second air intake port 22a for introducing air into the second air flow path 22b, a second air outlet 22c for blowing out the air flowing in the second air flow path 22b, and a second blower 22d for forming the air flow in the second air flow path 22b.

[0027] The carbon dioxide recovery device 10 recovers carbon dioxide contained in the air flowing through at least one of the first air flow path 21b and the second air flow path 22b. The carbon dioxide recovery device 10 includes an adsorbent, a separation unit 12, a first temperature and humidity sensor 13A, a second temperature and humidity sensor 13B, a first conveying path 14, a second conveying path 15, a switching unit 16, a control unit 17, and a recovery unit 18.

[0028] 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 supported on the surface of the substrate. The substrate can also be, for example, in a honeycomb shape.

[0029] The separation unit 12 has the function of separating carbon dioxide from the adsorbent. The separation unit 12 may also be provided with a heater to separate carbon dioxide by heating (e.g., 60 to 120° C.) the adsorbent. The heating temperature may also be appropriately changed according to the specific material of the adsorbent. Alternatively, the separation unit 12 may also be provided with a vacuum pump to separate carbon dioxide by placing the adsorbent under reduced pressure conditions.

[0030] The first temperature and humidity sensor 13A measures the temperature (hereinafter also referred to as the first temperature) and humidity (hereinafter also referred to as the first humidity) of the first air inlet 21 a . The measurement results of the first temperature and humidity sensor 13A are output to the control unit 17 .

[0031] The second temperature and humidity sensor 13B measures the temperature (hereinafter also referred to as the second temperature) and humidity (hereinafter also referred to as the second temperature) of the second air intake port 22 a . The measurement results of the second temperature and humidity sensor 13B are output to the control unit 17 .

[0032] The first temperature and humidity sensor 13A and the second temperature and humidity sensor 13B are examples of measuring units. The first temperature, the first humidity, the second temperature, and the second humidity are examples of parameters in the air that contribute to the adsorption efficiency of carbon dioxide by the adsorbent. In the present disclosure, the first humidity and the second humidity refer to relative humidity.

[0033] The first transport path 14 is a path for transporting the adsorbent via the first air flow path 21b and the separation unit 12. The second transport path 15 is a path for transporting the adsorbent via the second air flow path 22b and the separation unit 12. The adsorbent may be transported using, for example, a conveyor or a blower.

[0034] The first conveying path 14 includes a first duct 14a, a second duct 14b, and a third duct 14c. The first duct 14a connects the separation part 12 and the outdoor unit 21 via the switching part 16. The second duct 14b is provided in the outdoor unit 21. The second duct 14b intersects with the first air flow path 21b. The second duct 14b may be provided inside the outdoor unit 21 or may be installed in the outdoor unit 21. The second duct 14b may be provided at a position where the airflow of the first air flow path 21b hits. The second duct 14b connects the first duct 14a and the third duct 14c. The third duct 14c connects the outdoor unit 21 and the separation part 12 without passing through the switching part 16. In the first conveying path 14, the adsorbent is transported from the separation part 12 to the outdoor unit 21 through the first duct 14a, transported in the outdoor unit 21 through the second duct 14b, and returned to the separation part 12 from the outdoor unit 21 through the third duct 14c.

[0035] The second transport path 15 includes a first duct 15a, a second duct 15b, and a third duct 15c. The first duct 15a connects the separation part 12 and the indoor unit 22 via the switching part 16. The second duct 15b is provided in the indoor unit 22. The second duct 15b intersects with the second air flow path 22b. The second duct 15b may be provided inside the indoor unit 22 or may be installed in the indoor unit 22. The second duct 15b may be provided at a position where the airflow of the second air flow path 22b hits. The second duct 15b connects the first duct 15a and the third duct 15c. The third duct 15c connects the indoor unit 22 and the separation part 12 without passing through the switching part 16. In the second transport path 15, the adsorbent is transported from the separation part 12 to the indoor unit 22 through the first duct 15a, transported in the indoor unit 22 through the second duct 15b, and returned to the separation part 12 from the indoor unit 22 through the third duct 15c.

[0036] The switching unit 16 is provided in the first pipe 14a of the first conveying path 14 and the first pipe 15a of the second conveying path 15. The switching unit 16 switches between a state in which the adsorbent is conveyed through the first conveying path 14, a state in which the adsorbent is conveyed through the second conveying path 15, and a state in which the adsorbent is conveyed through both the first conveying path 14 and the second conveying path 15. The switching unit 16 includes, for example, a valve, and opens or closes the first conveying path 14 and the second conveying path 15 by opening and closing the valve.

[0037] The measurement results of the first temperature and humidity sensor 13A and the second temperature and humidity sensor 13B are input to the control unit 17. The control unit 17 controls the switching unit 16 based on the measurement results of the first temperature and humidity sensor 13A and the second temperature and humidity sensor 13B. The control of the control unit 17 will be described later.

[0038] The recovery unit 18 is connected to the separation unit 12. The recovery unit 18 recovers the carbon dioxide separated by the separation unit 12. The recovery unit 18 has, for example, a methanogenic system that has a function of generating methane using carbon dioxide, water, electricity, etc. The recovery unit 18 may also have a gas cylinder capable of storing carbon dioxide.

[0039] The carbon dioxide recovery method of the present embodiment includes a switching step, an adsorption step, a separation step, and a recovery step.

[0040] In the switching process, the control unit 17 controls the switching unit 16 based on the measurement results of the first temperature and humidity sensor 13A and the second temperature and humidity sensor 13B to switch the transport path of the adsorbent. Figure 2 as well as Figure 3 Switching of the transport path will be described.

[0041] like Figure 2As shown, first, the control unit 17 determines whether the transport condition of the adsorbent is satisfied for each of the outdoor unit 21 and the indoor unit 22 (step S11). When the temperature of the air inlet is below 60°C and the humidity of the air inlet is below 60%, it is determined that the transport condition is satisfied. When the temperature of the air inlet is higher than 60°C or the humidity of the air inlet is higher than 60%, the adsorbent is not transported because the adsorption efficiency of the adsorbent for carbon dioxide is reduced.

[0042] When neither the outdoor unit 21 nor the indoor unit 22 satisfies the transport condition, the control unit 17 controls the switching unit 16 so that the adsorbent is not transported in either the first transport path 14 or the second transport path 15 (ie, the transport of the adsorbent is stopped) (step S12).

[0043] When one of the outdoor unit 21 and the indoor unit 22 satisfies the transport condition and the other does not, the control unit 17 controls the switching unit 16 to transport the adsorbent through the first transport path 14 or the second transport path 15 of the one that satisfies the transport condition (step S13).

[0044] When both the outdoor unit 21 and the indoor unit 22 meet the delivery conditions, Figure 3 The control unit 17 determines whether the absolute value V1 of the difference between the first humidity of the first air inlet 21a and the second humidity of the second air inlet 22a is greater than 10% (step S21). That is, when the first humidity is M1 and the second humidity is M2, V1 = |M1-M2|.

[0045] When the absolute value V1 is greater than 10%, the control unit 17 determines which of the first humidity and the second humidity is lower, and controls the switching unit 16 so that the adsorbent is transported through the first transport path 14 or the second transport path 15 of the side with lower humidity (step S22). That is, when the first humidity is lower than the second humidity by more than 10%, the control unit 17 controls the switching unit 16 so as to switch the transport path of the adsorbent to the first transport path 14. When the second humidity is lower than the first humidity by more than 10%, the control unit 17 controls the switching unit 16 so as to switch the transport path of the adsorbent to the second transport path 15. The lower the humidity, the higher the adsorption performance of the adsorbent. By transporting the adsorbent through the transport path of the side with lower humidity, the adsorbent's adsorption efficiency of carbon dioxide is improved compared with the transport path of the side with higher humidity.

[0046] When the absolute value V1 is 10% or less, it is considered that the humidity of the air inlet is substantially the same in the outdoor unit 21 and the indoor unit 22. In this case, the control unit 17 determines whether the absolute value V2 of the difference between the first temperature of the first air inlet 21a and the second temperature of the second air inlet 22a is greater than 5°C (step S23). That is, when the first temperature is T1 and the second temperature is T2, V2 = |T1-T2|.

[0047] When the absolute value V2 is greater than 5°C, the control unit 17 determines which of the first temperature and the second temperature is lower, and controls the switching unit 16 so as to transport the adsorbent through the first transport path 14 or the second transport path 15 of the lower temperature (step S24). That is, when the first temperature is lower than the second temperature by more than 5°C, the control unit 17 controls the switching unit 16 so as to switch the transport path of the adsorbent to the first transport path 14. When the second temperature is lower than the first temperature by more than 5°C, the control unit 17 controls the switching unit 16 so as to switch the transport path of the adsorbent to the second transport path 15. The lower the temperature, the higher the adsorption performance of the adsorbent. By transporting the adsorbent through the transport path of the lower temperature, the adsorbent's adsorption efficiency of carbon dioxide is improved compared with the transport path of the higher temperature.

[0048] When the absolute value V2 is 5°C or less, the temperature of the air inlet is considered to be substantially the same in the outdoor unit 21 and the indoor unit 22. When the humidity and temperature of the air inlet are substantially the same in the outdoor unit 21 and the indoor unit 22, the control unit 17 controls the switching unit 16 to switch the transport path of the adsorbent to the first transport path 14 (step S25). Since the flow rate of air in the first air flow path 21b arranged outdoors is greater than the flow rate of air in the second air flow path 22b arranged indoors, the amount of carbon dioxide recovered can be increased by transporting the adsorbent using the first transport path 14.

[0049] In the adsorption step, the adsorbent is transported through the transport path switched in the switching step, so that the air flowing through the first air flow path 21 b or the second air flow path 22 b contacts the adsorbent, and the adsorbent adsorbs carbon dioxide.

[0050] The first transport path 14 intersects the first air flow path 21b in the outdoor unit 21. Therefore, when the adsorbent is transported through the first transport path 14, the air flowing through the first air flow path 21b comes into contact with the adsorbent transported through the first transport path 14.

[0051] The second transport path 15 intersects the second air flow path 22b in the indoor unit 22. Therefore, when the adsorbent is transported through the second transport path 15, the air flowing through the second air flow path 22b comes into contact with the adsorbent transported through the second transport path 15.

[0052] In the separation process, carbon dioxide is separated from the adsorbent adsorbed with carbon dioxide by the separation unit 12. The separation unit 12 may separate carbon dioxide by heating the adsorbent. Alternatively, the separation unit 12 may separate carbon dioxide by placing the adsorbent under reduced pressure. The separated carbon dioxide is transported to the recovery unit 18. The adsorbent from which carbon dioxide has been separated is used again in the adsorption process.

[0053] In the recovery step, the separated carbon dioxide is recovered by the recovery unit 18 .

[0054] As described above, the carbon dioxide recovery device 10 of the present embodiment comprises: an adsorbent for adsorbing carbon dioxide; a separation unit 12 for separating the carbon dioxide adsorbed on the adsorbent; a first temperature and humidity sensor 13A and a second temperature and humidity sensor 13B for measuring parameters in the air that contribute to the adsorption efficiency of the adsorbent on carbon dioxide; a first conveying path 14 for conveying the adsorbent via the first air flow path 21b and the separation unit 12; a second conveying path 15 for conveying the adsorbent via the second air flow path 22b and the separation unit 12; a switching unit 16 for switching between a state in which the adsorbent is conveyed through the first conveying path 14, a state in which the adsorbent is conveyed through the second conveying path 15, and a state in which the adsorbent is conveyed through both the first conveying path 14 and the second conveying path 15; a control unit 17 for controlling the switching unit 16 based on the measurement results of the first temperature and humidity sensor 13A and the second temperature and humidity sensor 13B; and a recovery unit 18 for recovering the carbon dioxide separated by the separation unit 12.

[0055] In addition, the carbon dioxide recovery method of the present embodiment comprises: a switching process, in which the conveying path of the adsorbent is switched between a state in which the adsorbent is conveyed through the first conveying path 14, a state in which the adsorbent is conveyed through the second conveying path 15, and a state in which the adsorbent is conveyed through both the first conveying path 14 and the second conveying path 15, based on the measurement results of parameters in the air that contribute to the adsorption efficiency of the adsorbent on carbon dioxide; an adsorption process, in which the adsorbent is conveyed through the conveying path switched in the switching process, so that the air flowing in at least one of the first air flow path 21b and the second air flow path 22b contacts the adsorbent, so that the adsorbent adsorbs carbon dioxide; a separation process, in which the carbon dioxide is separated from the adsorbent that adsorbed carbon dioxide in the adsorption process; and a recovery process, in which the carbon dioxide separated in the separation process is recovered.

[0056] According to such a carbon dioxide recovery device 10 or a carbon dioxide recovery method, carbon dioxide can be recovered efficiently by switching the transport path of the adsorbent based on the measurement result of the parameter in the air that contributes to the adsorption efficiency of carbon dioxide by the adsorbent.

[0057] In addition, the first air flow path 21b is provided in the outdoor unit 21, and the second air flow path 22b is provided in the indoor unit 22. The control unit 17 controls the switching unit 16 based on the measurement results of the first temperature and humidity sensor 13A measuring the first temperature and the first humidity of the first air intake port 21a and the second temperature and humidity sensor 13B measuring the second temperature and the second humidity of the second air intake port 22a.

[0058] The temperature and humidity of the air are often different outdoors and indoors. The adsorption performance of the adsorbent is affected by the temperature and humidity of the air. By switching the transport path of the adsorbent based on the measurement results of the first temperature and humidity sensor 13A and the second temperature and humidity sensor 13B, the recovery efficiency of carbon dioxide can be further improved.

[0059] Furthermore, when the first temperature and the second temperature are 60° C. or higher and the first humidity and the second humidity are 60% or higher, the control unit 17 controls the switching unit 16 to stop the conveyance of the adsorbent.

[0060] When the first temperature and the second temperature are 60°C or higher and the first humidity and the second humidity are 60% or higher, the adsorption efficiency of carbon dioxide by the adsorbent decreases. In this case, by stopping the transport of the adsorbent and not adsorbing carbon dioxide by the adsorbent, the power used to transport the adsorbent can be saved, thereby achieving power saving.

[0061] In addition, when the first temperature and the second temperature are substantially the same and the first humidity and the second humidity are substantially the same, the control unit 17 controls the switching unit 16 so that the adsorbent is transported through the first transport path 14. It should be noted that in the present disclosure, when the absolute value V2 of the difference between the first temperature and the second temperature is 5° C. or less, the first temperature and the second temperature are deemed to be substantially the same. When the absolute value V1 of the difference between the first humidity and the second humidity is 10% or less, the first humidity and the second humidity are deemed to be substantially the same.

[0062] The air flow rate in the first air flow path 21b is greater than that in the second air flow path 22b. Therefore, when the first temperature and the second temperature are substantially the same and the first humidity and the second humidity are substantially the same, the amount of carbon dioxide recovered can be increased by transporting the adsorbent using the first transport path 14.

[0063] Implementation method 2.

[0064] Next, a description will be given of a carbon dioxide recovery system 1 including a carbon dioxide recovery device 10 according to Embodiment 2. 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] like Figure 4 As shown, the carbon dioxide recovery system 1 of this embodiment includes a carbon dioxide recovery device 10, a first indoor unit 31, and a second indoor unit 32. The first indoor unit 31 and the second indoor unit 32 may be installed in the same room or in different rooms.

[0066] The first indoor unit 31 is installed indoors. The first indoor unit 31 is, for example, a cooling and heating machine. The first indoor unit 31 includes: a first air flow path 31b formed in the first indoor unit 31, a first air intake port 31a for introducing air into the first air flow path 31b, a first outlet port 31c for blowing out the air flowing in the first air flow path 31b, and a first blower 31d for forming an air flow in the first air flow path 31b.

[0067] The second indoor unit 32 is installed in the house. The second indoor unit 32 is, for example, a cooling and heating machine. The second indoor unit 32 includes: a second air flow path 32b formed in the second indoor unit 32, a second air intake port 32a for introducing air into the second air flow path 32b, a second outlet port 32c for blowing out the air flowing in the second air flow path 32b, and a second blower 32d for forming an air flow in the second air flow path 32b.

[0068] The carbon dioxide recovery device 10 recovers carbon dioxide contained in the air flowing through at least one of the first air flow path 31b and the second air flow path 32b. The carbon dioxide recovery device 10 includes an adsorbent, a separation unit 12, a first carbon dioxide sensor 19A, a second carbon dioxide sensor 19B, a first conveying path 14, a second conveying path 15, a switching unit 16, a control unit 17, and a recovery unit 18.

[0069] The first carbon dioxide sensor 19A measures the carbon dioxide concentration of the first air intake port 31 a (hereinafter also referred to as the first carbon dioxide concentration). The measurement result of the first carbon dioxide sensor 19A is output to the control unit 17 .

[0070] The second carbon dioxide sensor 19B measures the carbon dioxide concentration of the second air intake port 32 a (hereinafter also referred to as the second carbon dioxide concentration). The measurement result of the second carbon dioxide sensor 19B is output to the control unit 17 .

[0071] The first carbon dioxide sensor 19A and the second carbon dioxide sensor 19B are examples of measuring units. The first carbon dioxide concentration and the second carbon dioxide concentration are examples of parameters in the air that contribute to the adsorption efficiency of carbon dioxide by the adsorbent.

[0072] The carbon dioxide recovery method of the present embodiment includes a switching step, an adsorption step, a separation step, and a recovery step. The carbon dioxide recovery method of the present embodiment is different from the first embodiment in switching of the transport path in the switching step.

[0073] That is, in the present embodiment, in the switching step, the control unit 17 controls the switching unit 16 based on the measurement results of the first carbon dioxide sensor 19A and the second carbon dioxide sensor 19B to switch the transport path of the adsorbent.

[0074] Specifically, the control unit 17 determines which of the first carbon dioxide concentration in the first air inlet 31a and the second carbon dioxide concentration in the second air inlet 32a is higher, and controls the switching unit 16 to transport the adsorbent through the first transport path 14 or the second transport path 15 having the higher carbon dioxide concentration.

[0075] In the present embodiment, the first air flow path 31b is provided in the first indoor unit 31, and the second air flow path 32b is provided in the second indoor unit 32. The control unit 17 controls the switching unit 16 based on the measurement results of the first carbon dioxide sensor 19A measuring the first carbon dioxide concentration at the first air intake port 31a and the second carbon dioxide sensor 19B measuring the second carbon dioxide concentration at the second air intake port 32a.

[0076] In the first indoor unit 31 and the second indoor unit 32 installed indoors, the temperature and humidity of the air at the air intake port are generally the same. By switching the transport path of the adsorbent based on the measurement results of the first carbon dioxide sensor 19A and the second carbon dioxide sensor 19B, carbon dioxide can be more efficiently recovered from air with a high carbon dioxide concentration.

[0077] Implementation method 3.

[0078] Next, a description will be given of a carbon dioxide recovery system 1 including a carbon dioxide recovery device 10 according to Embodiment 3. The basic structure of the carbon dioxide recovery system 1 according to this embodiment is the same as that of Embodiment 2, and therefore, the description will be mainly focused on the differences.

[0079] like Figure 5 As shown, the carbon dioxide recovery system 1 of the present embodiment includes a carbon dioxide recovery device 10, a first indoor unit 31, and a second indoor unit 32. The carbon dioxide recovery device 10 includes an adsorbent, a separation unit 12, a first temperature and humidity sensor 13A, a second temperature and humidity sensor 13B, a first carbon dioxide sensor 19A, a second carbon dioxide sensor 19B, a first conveying path 14, a second conveying path 15, a switching unit 16, a control unit 17, and a recovery unit 18.

[0080] The first temperature and humidity sensor 13A measures the first temperature and the first humidity of the first air inlet 31 a . The measurement result of the first temperature and humidity sensor 13A is output to the control unit 17 .

[0081] The second temperature and humidity sensor 13B measures the second temperature and the second humidity of the second air inlet 32 ​​a . The measurement result of the second temperature and humidity sensor 13B is output to the control unit 17 .

[0082] The carbon dioxide recovery method of this embodiment includes a switching step, an adsorption step, a separation step, and a recovery step. The carbon dioxide recovery method of this embodiment is different from Embodiments 1 and 2 in switching of the transport path in the switching step.

[0083] Sometimes, the first indoor unit 31 and the second indoor unit 32 are arranged in different rooms, and the first indoor unit 31 performs heating operation, and the second indoor unit 32 performs cooling operation. In this case, the temperature and humidity may be different at the first air intake port 31a and the second air intake port 32a. It should be noted that, in the present embodiment, the first indoor unit 31 may be a cooling and heating machine, or a heating-only machine. The second indoor unit 32 may be a cooling and heating machine, or a cooling-only machine. The first indoor unit 31 and the second indoor unit 32 may be part of a common air conditioner, or part of different air conditioners.

[0084] In this embodiment, in the switching process, when the first indoor unit 31 is performing heating operation and the second indoor unit 32 is performing cooling operation, the control unit 17 controls the switching unit 16 to switch the delivery path of the adsorbent based on the measurement results of the first temperature and humidity sensor 13A, the second temperature and humidity sensor 13B, the first carbon dioxide sensor 19A and the second carbon dioxide sensor 19B.

[0085] First, the control unit 17 determines whether the temperature of the air intake port of each of the first indoor unit 31 and the second indoor unit 32 is 60° C. or less.

[0086] In both the first indoor unit 31 and the second indoor unit 32, when the temperature of the air intake port is higher than 60°C, the control unit 17 controls the switching unit 16 so that the adsorbent is not transported in either the first transport path 14 or the second transport path 15 (i.e., the transport of the adsorbent is stopped).

[0087] When the temperature of the air intake port in either the first indoor unit 31 or the second indoor unit 32 is below 60°C and the temperature of the air intake port in the other is greater than 60°C, the control unit 17 controls the switching unit 16 so as to transport the adsorbent through the first transport path 14 or the second transport path 15 on the side where the temperature of the air intake port is below 60°C.

[0088] In both the first indoor unit 31 and the second indoor unit 32, when the temperature of the air intake port is 60°C or less, the control unit 17 determines whether the absolute value V3 of the difference between the first carbon dioxide concentration at the first air intake port 31a and the second carbon dioxide concentration at the second air intake port 32a is greater than 100 ppm (volume basis. The same shall apply hereinafter in the present disclosure). That is, when the first carbon dioxide concentration is C1 and the second carbon dioxide concentration is C2, V3 = |C1-C2|.

[0089] When the absolute value V3 is greater than 100ppm, the control unit 17 determines which of the first carbon dioxide concentration and the second carbon dioxide concentration is higher, and controls the switching unit 16 so that the adsorbent is transported through the first transport path 14 or the second transport path 15, whichever has the higher carbon dioxide concentration. That is, when the first carbon dioxide concentration is higher than the second carbon dioxide concentration by more than 100ppm, the control unit 17 controls the switching unit 16 so that the transport path of the adsorbent is switched to the first transport path 14. When the second carbon dioxide concentration is higher than the first carbon dioxide concentration by more than 100ppm, the control unit 17 controls the switching unit 16 so that the transport path of the adsorbent is switched to the second transport path 15.

[0090] When the absolute value V3 is 100 ppm or less, it is considered that the carbon dioxide concentrations at the air intake ports of the first indoor unit 31 and the second indoor unit 32 are substantially the same. In this case, the control unit 17 determines which of the first humidity at the first air intake port 31a and the second humidity at the second air intake port 32a is lower, and controls the switching unit 16 so that the adsorbent is transported through the first transport path 14 or the second transport path 15 having the lower humidity.

[0091] In this embodiment, when the first indoor unit 31 is performing heating operation and the second indoor unit 32 is performing cooling operation, the control unit 17 controls the switching unit 16 based on the measurement results of the first carbon dioxide sensor 19A, the second carbon dioxide sensor 19B, the first temperature and humidity sensor 13A, and the second temperature and humidity sensor 13B.

[0092] When the first indoor unit 31 is in heating operation and the second indoor unit 32 is in cooling operation, the adsorbent delivery path is switched based on the measurement results of the first carbon dioxide sensor 19A, the second carbon dioxide sensor 19B, the first temperature and humidity sensor 13A, and the second temperature and humidity sensor 13B, so that carbon dioxide can be recovered more efficiently.

[0093] Implementation method 4.

[0094] Next, a description will be given of a carbon dioxide recovery system 1 including a carbon dioxide recovery device 10 according to Embodiment 4. 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.

[0095] like Figure 6 As shown, the carbon dioxide recovery system 1 of the present embodiment includes a carbon dioxide recovery device 10, an outdoor unit 21, and an indoor unit 22. The carbon dioxide recovery device 10 includes an adsorbent, a separation unit 12, a first temperature and humidity sensor 13A, a second temperature and humidity sensor 13B, a first conveying path 14, a second conveying path 15, a switching unit 16, a control unit 17, a recovery unit 18, and a storage unit 40.

[0096] The storage unit 40 is provided between the separation unit 12 and the switching unit 16. The adsorbent from which carbon dioxide is separated by the separation unit 12 is stored in the storage unit 40. The storage unit 40 is configured to store an amount of adsorbent capable of performing multiple adsorption processes. The storage unit 40 has an inlet for feeding the adsorbent and an outlet for conveying the adsorbent. The storage unit 40 is a sealed container in order not to adsorb humidity in the atmosphere.

[0097] The carbon dioxide recovery method of the present embodiment includes a switching step, an adsorption step, a separation step, a storage step, and a recovery step.

[0098] In the storage step, the adsorbent from which carbon dioxide has been separated in the separation step is stored in the storage unit 40 .

[0099] In the carbon dioxide recovery method of this embodiment, when the first adsorption process is completed, the adsorbent adsorbed with carbon dioxide is transported to the separation unit 12 to perform the separation process. At the same time, the second amount of adsorbent is transported from the storage unit 40 to the first transport path 14 or the second transport path 15 to perform the second adsorption process. In this way, the adsorption process and the separation process can be performed simultaneously.

[0100] The carbon dioxide recovery device 10 of the present embodiment further includes a storage unit 40 for storing an adsorbent.

[0101] The carbon dioxide recovery method of the present embodiment further includes a storage step of storing the adsorbent from which carbon dioxide has been separated in the separation step in the storage unit 40 , and performing the adsorption step and the separation step simultaneously using the adsorbent stored in the storage unit 40 .

[0102] Since the adsorption process and the separation process can be performed simultaneously, the recovery efficiency of carbon dioxide is further improved.

[0103] Implementation method 5.

[0104] Next, a description will be given of a carbon dioxide recovery system 1 including a carbon dioxide recovery device 10 according to Embodiment 5. 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.

[0105] like Figure 7 As shown, the carbon dioxide recovery system 1 of the present embodiment includes a carbon dioxide recovery device 10, an outdoor unit 21, and an indoor unit 22. The carbon dioxide recovery device 10 includes an adsorbent, a separation unit 12, a first conveying path 14, a second conveying path 15, a switching unit 16, a control unit 17, a recovery unit 18, a moisture adsorption unit 51, a first temperature sensor 52A, and a second temperature sensor 52B.

[0106] The moisture adsorption unit 51 is a dehumidifier that adsorbs moisture in the air. The moisture adsorption unit 51 is, for example, a dehumidification rotor arranged across the first duct 14a and the first duct 15a. In the first duct 14a, the moisture adsorption unit 51 is arranged between the switching unit 16 and the outdoor unit 21. In the first duct 15a, the moisture adsorption unit 51 is arranged between the switching unit 16 and the indoor unit 22. The moisture adsorption unit 51 may also be arranged between the separation unit 12 and the switching unit 16 in the first duct 14a and the first duct 15a.

[0107] The first temperature sensor 52A measures the temperature of the first air intake port 21 a (hereinafter also referred to as the first temperature). The measurement result of the first temperature sensor 52A is output to the control unit 17 .

[0108] The second temperature sensor 52B measures the temperature of the second air intake port 22 a (hereinafter also referred to as the second temperature). The measurement result of the second temperature sensor 52B is output to the control unit 17 .

[0109] The first temperature sensor 52A and the second temperature sensor 52B are examples of a measuring unit.

[0110] The carbon dioxide recovery method of the present embodiment includes a switching step, an adsorption step, a separation step, and a recovery step.

[0111] In the present embodiment, in the adsorption process, the adsorbent is transported to the first transport path 14 or the second transport path 15 while the air flowing through the first transport path 14 and the second transport path 15 is dehumidified by the moisture adsorption unit 51, so that the adsorbent adsorbs carbon dioxide. Thus, the adsorption performance of the adsorbent can be improved compared to the case where the moisture adsorption unit 51 is not provided.

[0112] In addition, in this embodiment, since the air flowing through the first conveying path 14 and the second conveying path 15 is dehumidified by the moisture adsorption unit 51, in the switching process, the control unit 17 controls the switching unit 16 based on the measurement results of the first temperature sensor 52A and the second temperature sensor 52B to switch the conveying path of the adsorbent.

[0113] First, the control unit 17 determines whether the temperature of the air intake port of each of the outdoor unit 21 and the indoor unit 22 is 60° C. or less.

[0114] When the air intake temperature of both the outdoor unit 21 and the indoor unit 22 is higher than 60° C., the control unit 17 controls the switching unit 16 so that the adsorbent is not transported in either the first transport path 14 or the second transport path 15 (i.e., the transport of the adsorbent is stopped).

[0115] When the temperature of the air intake port in either the outdoor unit 21 or the indoor unit 22 is below 60°C and the temperature of the air intake port in the other unit is higher than 60°C, the control unit 17 controls the switching unit 16 so as to transport the adsorbent through the first transport path 14 or the second transport path 15 on the side where the temperature of the air intake port is below 60°C.

[0116] When the air inlet temperature is 60°C or lower in both the outdoor unit 21 and the indoor unit 22, the control unit 17 determines whether the absolute value V2 of the difference between the first temperature of the first air inlet 21a and the second temperature of the second air inlet 22a is greater than 5°C.

[0117] When the absolute value V2 is greater than 5° C., the control unit 17 determines which of the first temperature and the second temperature is lower, and controls the switching unit 16 to transport the adsorbent through the first transport path 14 or the second transport path 15 having the lower temperature.

[0118] When the absolute value V2 is 5°C or less, the air inlet temperature is considered to be substantially the same in the outdoor unit 21 and the indoor unit 22. When the humidity and temperature of the air inlet are substantially the same in the outdoor unit 21 and the indoor unit 22, the control unit 17 controls the switching unit 16 to switch the transport path of the adsorbent to the first transport path 14.

[0119] The carbon dioxide recovery device of this embodiment further includes a moisture adsorption unit 51 that adsorbs moisture in the air flowing through the first conveying path 14 and the second conveying path 15. The control unit 17 controls the switching unit 16 based on the measurement results of the first temperature sensor 52A that measures the first temperature of the first air intake port 21a and the second temperature sensor 52B that measures the second temperature of the second air intake port 22a.

[0120] The adsorption performance of the adsorbent can be improved by adsorbing moisture in the air flowing through the first conveying path 14 and the second conveying path 15 by the moisture adsorption unit 51. In addition, by switching the conveying path of the adsorbent in the first conveying path 14 and the second conveying path 15 based on the measurement results of the first temperature sensor 52A and the second temperature sensor 52B, carbon dioxide can be efficiently recovered.

[0121] It should be noted that 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 gist of the present disclosure.

[0122] In embodiments 1, 4, and 5, the second air flow path 22b may also be provided in the ventilation system. In this case, the ventilation system includes, for example, the second air flow path 22b formed in the ventilation system, an air intake port for introducing air into the second air flow path 22b, an air outlet for blowing out the air flowing in the second air flow path 22b, and a ventilation fan for forming the air flow in the second air flow path 22b.

[0123] In the switching step in the above-described embodiment, the threshold values ​​of the temperature, humidity, and carbon dioxide concentration of the air intake port used for switching the transport path are merely examples and may be appropriately changed depending on the specific material of the adsorbent.

[0124] In Embodiment 3, similarly to Embodiment 1, the control unit 17 may determine whether or not the adsorbent transport condition is satisfied for each of the first indoor unit 31 and the second indoor unit 32 .

[0125] Furthermore, the above-described embodiments and modifications may be appropriately combined.

[0126] For example, the storage unit 40 of Embodiment 4 may be provided in the carbon dioxide recovery device 10 of Embodiments 1 to 3 and 5. In this case, for example, in Embodiment 1, when both the outdoor unit 21 and the indoor unit 22 satisfy the transport conditions, the control unit 17 may control the switching unit 16 so that the adsorbent is transported through both the first transport path 14 and the second transport path 15. In addition, in Embodiments 2 and 3, when the carbon dioxide concentrations at the air intake ports of the first indoor unit 31 and the second indoor unit 32 are substantially the same, the control unit 17 may control the switching unit 16 so that the adsorbent is transported through both the first transport path 14 and the second transport path 15. In Embodiment 5, when the air intake port temperature of both the outdoor unit 21 and the indoor unit 22 is 60° C. or less, the control unit 17 may control the switching unit 16 so that the adsorbent is transported through both the first transport path 14 and the second transport path 15.

[0127] Thus, since carbon dioxide can be adsorbed at a plurality of locations simultaneously, carbon dioxide can be recovered more efficiently.

[0128] In addition, the control unit 17 has a computer system inside. Moreover, the processing in the control unit 17 can be performed by recording a program for realizing the functions of each structure of the carbon dioxide recovery system 1 in a computer-readable recording medium, and making the computer system read and execute the program recorded in the recording medium. In addition, hardware other than the control unit 17 can also perform the above-mentioned processing.

[0129] 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.

[0130] 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, a 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.

[0131] 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 merge them into each structure possessed by the carbon dioxide recovery system 1 after downloading them at different time intervals. In addition, the distribution servers that distribute the divided programs may also be different. In addition, the "computer-readable recording medium" also includes a medium that retains 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 may also be a program for realizing a part of the above-mentioned functions. In addition, it may also be a program that can realize the above-mentioned functions by combining with a program already recorded in a computer system, that is, a so-called differential file (differential program).

[0132] Description of Reference Numerals

[0133] 10 Carbon dioxide recovery device 12 Separation unit 13A First temperature and humidity sensor (measuring unit) 13B Second temperature and humidity sensor (measuring unit) 14 First conveying path 15 Second conveying path 16 Switching unit 17 Control unit 18 Recovery unit 19A First carbon dioxide sensor (measuring unit) 19B Second carbon dioxide sensor (measuring unit) 21 Outdoor unit 21a First air intake port (air intake port) 21b First air flow path 22 Indoor unit 22a Second air intake port (air intake port) 22b Second air flow path 31 First indoor unit 31a First air intake port (air intake port) 31b First air flow path 32 Second indoor unit 32a Second air intake port (air intake port) 32b Second air flow path 40 Storage unit 51 Moisture adsorption unit 52A First temperature sensor (measuring unit) 52B Second temperature sensor (measuring unit)

Claims

1. A carbon dioxide recovery device for recovering carbon dioxide contained in air flowing through at least one of a first air flow path and a second air flow path, wherein: The carbon dioxide recovery device comprises: an adsorbent, wherein the adsorbent adsorbs carbon dioxide; a separation unit that separates the carbon dioxide adsorbed on the adsorbent; a measuring unit, the measuring unit measuring a parameter in the air that contributes to the adsorption efficiency of the adsorbent on carbon dioxide; a first transport path that transports the adsorbent via the first air flow path and the separation portion; a second transport path that transports the adsorbent via the second air flow path and the separation portion; a switching unit configured to switch a state in which the adsorbent is transported through the first transport path, a state in which the adsorbent is transported through the second transport path, and a state in which the adsorbent is transported through both the first transport path and the second transport path; a control unit configured to control the switching unit based on a measurement result of the measuring unit; as well as A recovery unit recovers the carbon dioxide separated by the separation unit.

2. The carbon dioxide recovery device according to claim 1, wherein: The first air flow path is provided in the outdoor unit. The second air flow path is provided in the indoor unit. The measuring unit includes: a first temperature and humidity sensor, the first temperature and humidity sensor measuring a first temperature and a first humidity of a first air intake port for introducing air into the first air flow path; and a second temperature and humidity sensor, the second temperature and humidity sensor measuring a second temperature and a second humidity of a second air intake port for introducing air into the second air flow path. The control unit controls the switching unit based on measurement results of the first temperature and humidity sensor and the second temperature and humidity sensor.

3. The carbon dioxide recovery device according to claim 1, wherein: The first air flow path is provided in the first indoor unit. The second air flow path is provided in the second indoor unit. The measuring unit includes: a first carbon dioxide sensor, the first carbon dioxide sensor measures the carbon dioxide concentration of a first air intake port that introduces air into the first air flow path; and a second carbon dioxide sensor, the second carbon dioxide sensor measures the carbon dioxide concentration of a second air intake port that introduces air into the second air flow path. The control unit controls the switching unit based on measurement results of the first carbon dioxide sensor and the second carbon dioxide sensor.

4. The carbon dioxide recovery device according to claim 3, wherein: The measuring unit further includes: a first temperature and humidity sensor, the first temperature and humidity sensor measuring the temperature and humidity of the first air intake port; and a second temperature and humidity sensor, the second temperature and humidity sensor measuring the temperature and humidity of the second air intake port. When the first indoor unit performs a heating operation and the second indoor unit performs a cooling operation, the control unit controls the switching unit based on measurement results of the first carbon dioxide sensor, the second carbon dioxide sensor, the first temperature and humidity sensor, and the second temperature and humidity sensor.

5. The carbon dioxide recovery device according to any one of claims 1 to 4, wherein: The carbon dioxide recovery device further includes a storage unit for storing the adsorbent.

6. The carbon dioxide recovery device according to claim 1, wherein: The carbon dioxide recovery device further includes a moisture adsorption unit that adsorbs moisture in the air flowing through the first transport path and the second transport path. The first air flow path is provided in the outdoor unit. The second air flow path is provided in the indoor unit. The measuring unit includes: a first temperature sensor for measuring the temperature of a first air intake port for introducing air into the first air flow path; and a second temperature sensor for measuring the temperature of a second air intake port for introducing air into the second air flow path. The control unit controls the switching unit based on measurement results of the first temperature sensor and the second temperature sensor.

7. The carbon dioxide recovery device according to claim 1, wherein: The measuring unit includes: a first temperature and humidity sensor, the first temperature and humidity sensor measuring a first temperature and a first humidity of a first air intake port for introducing air into the first air flow path; and a second temperature and humidity sensor, the second temperature and humidity sensor measuring a second temperature and a second humidity of a second air intake port for introducing air into the second air flow path. The control unit controls the switching unit to stop conveyance of the adsorbent when the first temperature and the second temperature are 60° C. or higher and the first humidity and the second humidity are 60% or higher.

8. The carbon dioxide recovery device according to claim 1, wherein: The measuring unit includes: a first temperature and humidity sensor, the first temperature and humidity sensor measuring a first temperature and a first humidity of a first air intake port for introducing air into the first air flow path; and a second temperature and humidity sensor, the second temperature and humidity sensor measuring a second temperature and a second humidity of a second air intake port for introducing air into the second air flow path. The control unit controls the switching unit so that the adsorbent is transported through the first transport path when the first temperature and the second temperature are substantially the same and the first humidity and the second humidity are substantially the same.

9. The carbon dioxide recovery device according to claim 1, wherein: The first air flow path is provided in the outdoor unit. The second air flow path is provided in the ventilation system, The measuring unit includes: a first temperature and humidity sensor, the first temperature and humidity sensor measuring a first temperature and a first humidity of a first air intake port for introducing air into the first air flow path; and a second temperature and humidity sensor, the second temperature and humidity sensor measuring a second temperature and a second humidity of a second air intake port for introducing air into the second air flow path. The control unit controls the switching unit based on measurement results of the first temperature and humidity sensor and the second temperature and humidity sensor.

10. The carbon dioxide recovery device according to claim 1, wherein: The carbon dioxide recovery device further includes a moisture adsorption unit that adsorbs moisture in the air flowing through the first transport path and the second transport path. The first air flow path is provided in the outdoor unit. The second air flow path is provided in the ventilation system, The measuring unit includes: a first temperature sensor for measuring the temperature of a first air intake port for introducing air into the first air flow path; and a second temperature sensor for measuring the temperature of a second air intake port for introducing air into the second air flow path. The control unit controls the switching unit based on measurement results of the first temperature sensor and the second temperature sensor.

11. A method for recovering carbon dioxide, using an adsorbent for adsorbing carbon dioxide, to recover carbon dioxide contained in air flowing through at least one of a first air flow path and a second air flow path, wherein: The carbon dioxide recovery method comprises: a switching step of switching a conveying path of the adsorbent between a state in which the adsorbent is conveyed through a first conveying path through the first air flow path, a state in which the adsorbent is conveyed through a second conveying path through the second air flow path, and a state in which the adsorbent is conveyed through both the first conveying path and the second conveying path, based on a measurement result of a parameter in the air that contributes to an adsorption efficiency of carbon dioxide by the adsorbent; an adsorption step, in which the adsorbent is transported through the transport path switched in the switching step, so that air flowing through the at least one air flow path contacts the adsorbent, and the adsorbent adsorbs carbon dioxide; a separation step of separating carbon dioxide from the adsorbent that has adsorbed carbon dioxide in the adsorption step; as well as A recovery step, in which the carbon dioxide separated in the separation step is recovered.

12. The carbon dioxide recovery method according to claim 11, wherein: The carbon dioxide recovery method further comprises a storage step in which the adsorbent from which the carbon dioxide has been separated in the separation step is stored in a storage unit. The adsorption process and the separation process are simultaneously performed using the adsorbent stored in the storage unit.

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