Carbon dioxide recovery system, resource generation system, and carbon dioxide recovery method

Abstract

This carbon dioxide recovery system (2) is provided with: an air conditioning device (10) comprising an outdoor unit (11) provided with a compressor (13), a heat exchanger (14), and an outdoor blower (15), and at least one indoor unit (12) provided with an indoor blower; and a carbon dioxide recovery device (30) that is provided downstream or upstream of the outdoor blower (15) or the indoor blower and that recovers carbon dioxide by means of the air blown by the outdoor blower (15) or the indoor blower.

Description

Technical Field

[0001] The present disclosure relates to a carbon dioxide recovery system, a resource generation system, and a carbon dioxide recovery method. Background Art

[0002] Patent Document 1 discloses a gas removal and concentration device that separates and removes carbon dioxide contained in a treatment target gas from the treatment target gas.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2021-94485 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In such an installation, power is required when recovering the carbon dioxide.

[0008] In view of the above circumstances, an object of the present disclosure is to provide a carbon dioxide recovery system, a resource generation system, and a carbon dioxide recovery method that can recover carbon dioxide with a simple structure.

[0009] Solutions to Solve Problems

[0010] One embodiment of the carbon dioxide recovery system disclosed in the present invention comprises: an air conditioning device, which includes an outdoor unit equipped with a compressor, a heat exchanger, and an outdoor blower, and at least one indoor unit equipped with an indoor blower; and a carbon dioxide recovery device, which is arranged downstream or upstream of the outdoor blower or the indoor blower, and recovers carbon dioxide by using the air supplied by the outdoor blower or the indoor blower.

[0011] One aspect of the resource generation system disclosed herein comprises: the carbon dioxide recovery system; a carbon dioxide storage device that stores carbon dioxide recovered by the carbon dioxide recovery system; and a carbon dioxide resource recovery system that supplies carbon dioxide from the carbon dioxide storage device to the carbon dioxide resource recovery system.

[0012] One aspect of the carbon dioxide recovery method disclosed herein is a carbon dioxide recovery method using the carbon dioxide recovery system, wherein the carbon dioxide recovery device recovers carbon dioxide using air supplied by the outdoor blower or the indoor blower.

[0013] Effects of the Invention

[0014] According to the present disclosure, it is possible to provide a carbon dioxide recovery system, a resource generation system, and a carbon dioxide recovery method that can recover carbon dioxide with a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a block diagram of the resource generation system according to the first embodiment.

[0016] Figure 2 This is a schematic diagram of the carbon dioxide recovery system of embodiment 1.

[0017] Figure 3 This is a block diagram of the carbon dioxide recovery system according to the first embodiment.

[0018] Figure 4 This is a flow chart of the carbon dioxide recovery method according to the first embodiment.

[0019] Figure 5 This is a schematic diagram of a carbon dioxide recovery system according to Embodiment 2.

[0020] Figure 6 This is a flow chart of the carbon dioxide recovery method of embodiment 2.

[0021] Figure 7 This is a schematic diagram of a carbon dioxide recovery system according to Embodiment 3.

[0022] Figure 8 This is a schematic diagram of a carbon dioxide recovery system in Embodiment 4.

[0023] Fig. 9 This is a flow chart of the carbon dioxide recovery method of embodiment 4.

[0024] Fig.10 This is a schematic diagram of a carbon dioxide recovery system in embodiment 5.

[0025] Fig.11 This is a flow chart of the carbon dioxide recovery method of embodiment 5.

[0026] Fig.12 It is a block diagram of the carbon dioxide recovery system and the power supply system according to the sixth embodiment, and is a diagram showing a power supply path in the first period.

[0027] Fig.13 It is a block diagram of the carbon dioxide recovery system and the power supply system according to the sixth embodiment, and is a diagram showing the power supply path in the second period.

[0028] Fig.14 It is a block diagram of the carbon dioxide recovery system and the power supply system according to the seventh embodiment, and is a diagram showing a power supply path in the third period.

[0029] Fig.15It is a block diagram of the carbon dioxide recovery system and the power supply system according to the seventh embodiment, and is a diagram showing a power supply path in the fourth period. DETAILED DESCRIPTION

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

[0031] Implementation Method 1

[0032] Figure 1 This is a block diagram showing the resource generation system 1 in the first embodiment. Figure 2 This is a schematic diagram showing the carbon dioxide recovery system 2 in the first embodiment. Figure 3 This is a block diagram showing the carbon dioxide recovery system 2 in the first embodiment.

[0033] (Resource Generation System 1)

[0034] The resource generation system 1 collects carbon dioxide from the air and generates resources (for example, methane, etc.) from the collected carbon dioxide. The resource generation system 1 includes a carbon dioxide collection system 2, a carbon dioxide storage device 3, and a carbon dioxide resource system 4.

[0035] like Figure 1 As shown, the carbon dioxide recovery system 2 recovers carbon dioxide from the air. The carbon dioxide storage device 3 stores the carbon dioxide recovered by the carbon dioxide recovery system. Carbon dioxide is supplied from the carbon dioxide storage device 3 to the carbon dioxide resource system 4. The carbon dioxide resource system 4 generates resources from carbon dioxide. As the carbon dioxide resource system 4, for example, a methanation system can be listed. The methanation system has a function of generating methane using carbon dioxide, water, electricity, etc. In addition, between the carbon dioxide storage device 3 and the carbon dioxide resource system 4, carbon dioxide can be transported, for example, via a pipe, or it can be carried by an operator.

[0036] (Carbon dioxide recovery system 2)

[0037] like Figure 2 and Figure 3 As shown, the carbon dioxide recovery system 2 includes an air conditioning device 10 , a carbon dioxide recovery device 30 , and a control device 50 .

[0038] The air conditioning device 10 is, for example, installed in a building (e.g., a building, an apartment, etc.). The air conditioning device 10 regulates the air in a room (inside a building, in a house). The air conditioning device 10 has the functions of cooling, heating, and dehumidifying the room. In addition, the air conditioning device 10 may also be a device having at least one of the functions of cooling, heating, and dehumidifying.

[0039] The air conditioning device 10 includes an outdoor unit 11 and an indoor unit 12. In the air conditioning device 10, a refrigerant (heat medium) circulates between the outdoor unit 11 and the indoor unit 12. In addition, one indoor unit 12 may be provided for one outdoor unit 11. In this case, the refrigerant circulates between one outdoor unit 11 and one indoor unit 12. In addition, a plurality of indoor units 12 may be provided for one outdoor unit 11. In this case, the refrigerant circulates between one outdoor unit 11 and a plurality of indoor units 12. In the present embodiment, one indoor unit 12 is provided for one outdoor unit 11.

[0040] The outdoor unit 11 includes a compressor 13, a heat exchanger 14, and an outdoor blower 15. The compressor 13 compresses the refrigerant to raise the temperature of the refrigerant. The heat exchanger 14 performs heat exchange between the refrigerant and the outside air (air). The outdoor blower 15 transfers the outside air that has undergone heat exchange through the heat exchanger 14 to the outside of the outdoor unit 11. The outdoor blower 15 blows air from the inside of the outdoor unit 11 to the outside.

[0041] The indoor unit 12 is installed in a space (indoor) to be air conditioned. The indoor unit 12 receives cold energy and heat energy from the outdoor unit 11 via a refrigerant, and performs cooling, dehumidification, and heating in the respective rooms. Examples of the indoor unit 12 include a ceiling embedded type embedded in the ceiling, a ceiling type suspended from the ceiling, and a wall-mounted type hung on the wall. However, the form of the indoor unit 12 is not particularly limited.

[0042] The indoor unit 12 includes an indoor air-sending device 16. The indoor air-sending device 16 moves the air that has exchanged heat with the refrigerant in the indoor unit 12 to the indoor room. The indoor air-sending device 16 sends air from the inside of the indoor unit 12 to the outside.

[0043] In addition, well-known structures can be adopted as the outdoor unit 11 and the indoor unit 12. For example, the outdoor unit 11 may further include an expansion valve for expanding the refrigerant, a switching valve for switching the direction of the flow of the refrigerant, and the like.

[0044] The carbon dioxide recovery device 30 is installed downstream or upstream of the outdoor blower 15 or the indoor blower 16. In other words, the carbon dioxide recovery device 30 is installed at least one of (1) downstream of the outdoor blower 15, (2) upstream of the outdoor blower 15, (3) downstream of the indoor blower 16, and (4) upstream of the indoor blower 16.

[0045] Here, (1) downstream of the outdoor fan 15 refers to, for example, a space into which the air from the outdoor fan 15 is blown when the outdoor fan 15 is blowing air. (2) upstream of the outdoor fan 15 refers to, for example, a space into which the air sucked by the outdoor fan 15 is located when the outdoor fan 15 is blowing air. (3) downstream of the indoor fan 16 refers to, for example, a space into which the air from the indoor fan 16 is blown when the indoor fan 16 is blowing air. (4) upstream of the indoor fan 16 refers to, for example, a space into which the air sucked by the indoor fan 16 is located when the indoor fan 16 is blowing air.

[0046] In the present embodiment, the carbon dioxide recovery system 2 includes a first recovery device 30 a and a second recovery device 30 b as the carbon dioxide recovery devices 30 .

[0047] The first recovery device 30a is provided in the outdoor unit 11. The first recovery device 30a is preferably installable (can be retrofitted) to the existing outdoor unit 11, for example. In the illustrated example, the first recovery device 30a is provided (1) downstream of the outdoor blower 15. However, the first recovery device 30a may be provided (2) upstream of the outdoor blower 15. The first recovery device 30a may also be provided both (1) downstream of the outdoor blower 15 and (2) upstream of the outdoor blower 15.

[0048] The second recovery device 30b is provided in the indoor unit 12. The second recovery device 30b is preferably installable (can be retrofitted) to the existing indoor unit 12, for example. In the example shown in the figure, the second recovery device 30b is provided downstream of the (3) indoor air blower 16. However, the second recovery device 30b may be provided upstream of the (4) indoor air blower 16. The second recovery device 30b may also be provided both downstream of the (3) indoor air blower 16 and upstream of the (4) indoor air blower 16.

[0049] The first recovery device 30a recovers carbon dioxide using air blown by the outdoor blower 15. The second recovery device 30b recovers carbon dioxide using air blown by the indoor blower 16. That is, each carbon dioxide recovery device 30 recovers carbon dioxide using air blown by the outdoor blower 15 or the indoor blower 16.

[0050] Hereinafter, an example of the carbon dioxide recovery device 30 will be described. However, the carbon dioxide recovery device 30 is not limited to the following example.

[0051] The carbon dioxide recovery device 30 includes a container 31 , an adsorbent 32 , a switching mechanism 33 , and a heat source 34 .

[0052] The container 31 is ventilated. Therefore, when the indoor blower 16 and the outdoor blower 15 blow air, air enters the container 31 or the air in the container 31 is exhausted. In other words, the air inside the container 31 and the air outside can be replaced by the air blown by the indoor blower 16 and the outdoor blower 15.

[0053] The container 31 only needs to be able to accommodate the adsorbent 32 and have air permeability. For example, when the adsorbent 32 is granular, a plurality of holes smaller than the particle size of the adsorbent 32 may be formed in the container 31. The entire or a portion of the container 31 may also be mesh-shaped. The material of the container 31 may be appropriately changed, and may be metal or resin. As the container 31, a structure other than the above may also be adopted.

[0054] The adsorbent 32 includes a material capable of adsorbing carbon dioxide. Examples of materials capable of adsorbing carbon dioxide include amines, zeolites, silica gel, diatomaceous earth, alumina, activated carbon, and the like. Multiple materials can be selected from the above materials and used, and materials other than the above can also be used. The adsorbent 32 can be granular (e.g., beaded (spherical), granular (cylindrical)). Alternatively, a powdered adsorbent 32 can also be used. In this case, the powdered adsorbent 32 can also be carried on the surface of the substrate. The substrate can also be, for example, in a honeycomb shape. In addition, as the adsorbent 32, a material that separates carbon dioxide when the adsorbent 32 that has adsorbed carbon dioxide is heated (e.g., 60 to 120°C) is preferred. The heating temperature is appropriately changed according to the specific material of the adsorbent 32.

[0055] The switching mechanism 33 switches the flow path (wind path) of the air blown from the outdoor blower 15 or the indoor blower 16. The switching mechanism 33 switches the wind path between the first wind path and the second wind path, for example. The air passing through the first wind path contacts the adsorbent 32 more than the air passing through the second wind path. In this case, the switching mechanism 33 switches the first wind path and the second wind path to adjust the absorption amount of carbon dioxide. In addition, the air passing through the second wind path does not need to contact the adsorbent 32. As the switching mechanism 33, for example, a movable fan is exemplified. In this case, the wind path is switched, for example, by the direction of the fan.

[0056] The heat source 34 supplies cooling energy or heating energy to the adsorbent 32. The heat source 34 generates heat or absorbs heat by, for example, receiving electric power. The heat source 34 may also supply cooling energy or heating energy to the adsorbent 32 via, for example, air blown from the outdoor blower 15 or the indoor blower 16. The heat source 34 may also supply cooling energy or heating energy to the adsorbent 32 by, for example, radiation.

[0057] Furthermore, the switching mechanism 33 and the heat source 34 may not be provided.

[0058] The carbon dioxide recovery device 30 is connected to the carbon dioxide storage device 3 via the piping 35. The piping transfers the carbon dioxide separated from the carbon dioxide recovery device 30 to the carbon dioxide storage device 3. In addition, the piping 35 may not be provided. In this case, for example, the carbon dioxide recovery device 30 can be disassembled from the air conditioning device 10, and carbon dioxide is separated from the carbon dioxide recovery device 30 disassembled from the air conditioning device 10. Thus, the carbon dioxide separated from the carbon dioxide recovery device 30 can be stored in the carbon dioxide storage device 3. In this case, the container 31 containing the adsorbent 32 in the carbon dioxide recovery device 30 can also be a cartridge, so that the container 31 can be disassembled from the carbon dioxide recovery device 30 (the main body of the carbon dioxide recovery device 30), for example.

[0059] The control device 50 controls at least the air conditioner 10 of the air conditioner 10 and the carbon dioxide recovery device 30. In the present embodiment, the control device 50 controls both the air conditioner 10 and the carbon dioxide recovery device 30. However, for example, when the carbon dioxide recovery device 30 does not include the switching mechanism 33, the heat source 34, etc., in other words, when the carbon dioxide recovery device 30 is a structure in which the adsorbent 32 is merely stored in the container 31, the control device 50 may not control the carbon dioxide recovery device 30.

[0060] In the present embodiment, the control device 50 includes a first control device 51, a second control device 52, and a third control device 53. The first control device 51 is built into the air conditioning device 10 (for example, at least one of the outdoor unit 11 and the indoor unit 12). The first control device 51 controls each structure of the air conditioning device 10. The second control device 52 is built into the carbon dioxide recovery device 30. The second control device 52 controls each structure of the carbon dioxide recovery device 30. The third control device 53 is arranged outside the air conditioning device 10 and outside the carbon dioxide recovery device 30. The third control device 53 can communicate with the first control device 51 and the second control device 52. The third control device 53 controls the first control device 51 and the second control device 52.

[0061] The control device 50 may not include all of the first control device 51, the second control device 52, and the third control device 53. For example, the control device 50 may include the first control device 51 and the second control device 52 but not include the third control device 53. In this case, the first control device 51 and the second control device 52 may also communicate directly. For example, in the case where the carbon dioxide recovery device 30 is a structure in which the adsorbent 32 is stored in the container 31, the control device 50 may include the first control device 51 but not include the second control device 52 and the third control device 53.

[0062] (Carbon dioxide recovery method)

[0063] The carbon dioxide recovery method of the present embodiment uses the above-mentioned carbon dioxide recovery system 2 . Figure 4 This is a flowchart showing the carbon dioxide recovery method and resource generation method in the first embodiment.

[0064] like Figure 4 As shown, in the carbon dioxide recovery method of this embodiment, the carbon dioxide recovery device 30 recovers carbon dioxide using air supplied by the outdoor blower 15 or the indoor blower 16. In addition, the carbon dioxide recovery device 30 uses the heat energy or cold energy of the refrigerant of the air conditioning device 10 as at least a part of the heat source for recovering or separating carbon dioxide.

[0065] For example, in the present embodiment, when the air conditioning device 10 (also referred to as "air conditioner" in the figure. The same applies to the following figures) does not condition the indoor air (for example, when neither heating nor cooling the indoor air is performed), the air supply power of the air conditioning device 10 is also used to recover or separate carbon dioxide. At this time, the control device 50 operates at least one of the outdoor blower 15 and the indoor blower 16 while stopping the compressor 13 (S11). Then, air is supplied from the outdoor blower 15 and the indoor blower 16 to the carbon dioxide recovery device 30, and carbon dioxide is recovered and separated in the carbon dioxide recovery device 30 that receives the air supply (S12). At this time, the control device 50 preferably appropriately controls the heat source 34 of the carbon dioxide recovery device 30 to promote the recovery and separation of carbon dioxide.

[0066] Furthermore, in the present embodiment, when the air conditioning device 10 is conditioning the indoor air (for example, when heating or cooling the indoor air), the air supply power of the air conditioning device 10 is also used to recover or separate carbon dioxide. At this time, the control device 50 operates both the outdoor air blower 15 and the indoor air blower 16 while the compressor 13 is in operation (S13). As a result, air is supplied from the outdoor air blower 15 and the indoor air blower 16 to the carbon dioxide recovery device 30, and carbon dioxide is recovered and separated in the carbon dioxide recovery device 30 receiving the supplied air (S14). The air supplied from the outdoor air blower 15 and the indoor air blower 16 to the carbon dioxide recovery device 30 receives heat energy or cold energy from the refrigerant, and the temperature is adjusted.

[0067] Therefore, in this embodiment, the control device 50 preferably controls at least the air conditioning device 10 among the air conditioning device 10 and the carbon dioxide recovery device 30 so that the heat energy or cold energy of the refrigerant of the air conditioning device 10 becomes at least a part of the heat source for recovery or separation of carbon dioxide performed by the carbon dioxide recovery device 30.

[0068] For example, when the heat source 34 of the second recovery device 30b (the carbon dioxide recovery device 30 provided in the indoor unit 12) needs to generate heat energy and the air conditioning device 10 performs heating operation, the heat energy generated by the heat source 34 of the second recovery device 30b can be reduced by an amount corresponding to the heat energy received by the second recovery device 30b through the air supply of the indoor fan 16. In addition, when the heat source 34 of the second recovery device 30b needs to generate cold energy and the air conditioning device 10 performs cooling operation, the cold energy generated by the heat source 34 of the second recovery device 30b can be reduced by an amount corresponding to the cold energy received by the second recovery device 30b through the air supply of the indoor fan 16.

[0069] For example, when the heat source 34 of the first recovery device 30a (the carbon dioxide recovery device 30 provided in the outdoor unit 11) needs to generate heat energy and the air conditioning device 10 performs a heating operation, the cold energy generated by the heat source 34 of the first recovery device 30a can be reduced by an amount corresponding to the cold energy received by the first recovery device 30a through the air supply of the outdoor blower 15. In addition, when the heat source 34 of the first recovery device 30a needs to generate heat energy and the air conditioning device 10 performs a cooling operation, the heat energy generated by the heat source 34 of the first recovery device 30a can be reduced by an amount corresponding to the heat energy received by the first recovery device 30a through the air supply of the outdoor blower 15.

[0070] In addition, when the heat source 34 of the second recovery device 30b needs to generate heat energy and the air conditioning device 10 performs cooling operation, for example, when the heat required by the carbon dioxide recovery device 30 and the heat supplied by the air conditioning device 10 to the carbon dioxide recovery device 30 are reversed in positive and negative, the control device 50 may also control the switching mechanism 33. In this case, for example, the switching mechanism 33 may also switch the air path to the second air path. In addition, in the case of the positive and negative reversal of the heat as described above, the control device 50 may control the heat source 34 instead of the switching mechanism 33 to further increase the supply of heat from the heat source 34.

[0071] Here, in this embodiment, when the air conditioning device 10 is conditioning the indoor air, the carbon dioxide recovery device 30 may not recover carbon dioxide. In this case, for example, the control device 50 may control the switching mechanism 33 to switch the air passage to the second air passage.

[0072] In addition, in the present embodiment, when the air conditioning device 10 does not condition the indoor air (for example, when neither heating nor cooling the indoor air is performed), the carbon dioxide may be recovered or separated by using the heat energy or cold energy of the refrigerant from the air conditioning device 10. At this time, for example, the control device 50 may operate the compressor 13 while stopping the outdoor air blower 15 and the indoor air blower 16, so that the refrigerant circulates between the indoor unit 12 and the outdoor unit 11 (so-called defrosting operation, etc.).

[0073] Furthermore, in the present embodiment, the control device 50 may control the air-conditioning device 10 as follows.

[0074] In the present embodiment, the control device 50 can operate the air conditioning device 10 in the first operation mode or the second operation mode. The air conditioning device 10 operating in the first operation mode operates at a capacity lower than the rated capacity of the air conditioning device 10. The air conditioning device 10 operating in the second operation mode operates by increasing the air supply capacity of at least one of the outdoor air blower 15 and the indoor air blower 16 compared to when operating in the first operation mode. When the air conditioning device 10 is operated by increasing the air supply capacity of at least one of the outdoor air blower 15 and the indoor air blower 16, more air is blown to the carbon dioxide recovery device 30 compared to the case where the air supply capacity is not increased. Therefore, the carbon dioxide recovery device 30 recovers more carbon dioxide.

[0075] Therefore, the control device 50 may operate the air conditioning device 10 in the second operation mode when it is determined based on the air conditioning conditions that the air conditioning device 10 should be operated in the first operation mode and when it is determined based on the carbon dioxide recovery conditions that the carbon dioxide recovery capacity should be increased.

[0076] The control device 50 selects an operation mode based on the conditions of air conditioning. The conditions of air conditioning are set based on, for example, the rotation speed of the motor of the outdoor blower 15, the rotation speed of the motor of the indoor blower 16 (hereinafter, sometimes collectively referred to as the rotation speed), the target temperature, the room temperature, and the pressure of the refrigerant. For example, the control device 50 receives an input from a user and obtains the target temperature. For example, the control device 50 obtains the room temperature from a temperature sensor. For example, the control device 50 obtains the rotation speed from the outdoor blower 15 and the indoor blower 16. For example, the control device 50 obtains the pressure of the refrigerant from a pressure sensor provided in the circulation path of the refrigerant. For example, the control device 50 obtains the rotation speed and the pressure of the refrigerant until the room temperature reaches the target temperature over time, and estimates the load of the air conditioning device 10. At this time, the control device 50 may also obtain other indicators (information), for example. At this time, the control device 50 may not obtain part or all of the target temperature, room temperature, rotation speed, and pressure of the refrigerant, for example. The control device 50 selects a preferred operation mode from a plurality of operation modes based on the estimated load of the air conditioning device 10.

[0077] Even when the control device 50 determines to operate the air conditioner 10 in the first operation mode based on such air conditioning conditions, the control device 50 may intentionally operate the air conditioner 10 in the second operation mode when it determines to increase the carbon dioxide recovery capacity based on the carbon dioxide recovery conditions.

[0078] As the recovery conditions of carbon dioxide considered by the control device 50, for example, in regions with four seasons such as Japan, seasons (times) and the like can be listed. For example, in the intermediate seasons (spring and autumn) where the air conditioning load is smaller than in summer and winter, the amount of carbon dioxide recovered may decrease as the air conditioning load decreases. Therefore, the control device 50 may also deliberately operate the air conditioning device 10 in the second operation mode based on information about the season (for example, when it is determined that the current time belongs to the above-mentioned intermediate season). In this case, when the air conditioning device 10 may excessively supply cold energy or heat energy to the room, for example, the control device 50 may also appropriately adjust the cold energy or heat energy by controlling the pressure (temperature) of the refrigerant through the compressor 13. In addition, as the recovery conditions of carbon dioxide considered by the control device 50, not only long-term changes can be made, but also short-term changes such as daytime and nighttime.

[0079] (Resource generation method)

[0080] The carbon dioxide recovered by the above-described recovery method is concentrated (S15) and stored in the carbon dioxide storage device 3 (S16). Thereafter, the carbon dioxide is transferred from the carbon dioxide storage device 3 to the carbon dioxide resource recovery system 4 (methanization system) and recovered as a resource such as methane.

[0081] As described above, according to the carbon dioxide recovery system 2 of the present embodiment, the carbon dioxide recovery device 30 recovers carbon dioxide by using the air supplied by the outdoor blower 15 or the indoor blower 16. Therefore, the carbon dioxide recovery device 30 itself (1) may not have power for air supply, or (2) when having power for air supply, it may use a power with a small capacity as the power. Thus, carbon dioxide can be recovered with a simple structure.

[0082] Furthermore, when the air conditioning device 10 is operating to condition the indoor air, the air can be supplied by the outdoor blower 15 or the indoor blower 16 to not only condition the air but also collect carbon dioxide. Thus, carbon dioxide can be collected energy-savingly (with less energy).

[0083] The control device 50 operates at least one of the outdoor blower 15 and the indoor blower 16 while stopping the compressor 13. Therefore, when the air conditioning device 10 is not operating to condition the indoor air, the outdoor blower 15 and the indoor blower 16 can be effectively used as power for recovering carbon dioxide.

[0084] When the control device 50 determines to operate the air conditioner 10 in the first operation mode based on the air conditioning conditions and determines to increase the carbon dioxide recovery capacity based on the carbon dioxide recovery conditions, the control device 50 operates the air conditioner 10 in the second operation mode. Thus, even in a period when the air conditioning conditions are relaxed (for example, in the middle seasons such as spring and autumn) when the control device 50 usually operates the air conditioner 10 in the first operation mode, the carbon dioxide recovery capacity can be increased.

[0085] The heat energy or cold energy of the refrigerant of the air conditioning device 10 becomes at least a part of the heat source for the recovery or separation of carbon dioxide by the carbon dioxide recovery device 30. Thus, even if the carbon dioxide recovery device 30 requires heat energy or cold energy, (1) the heat energy or cold energy generated by the carbon dioxide recovery device 30 itself is not required, or (2) even if the carbon dioxide recovery device 30 itself generates heat energy or cold energy, the amount of heat energy or cold energy generated can be reduced. Thus, carbon dioxide can be recovered in an energy-saving manner.

[0086] Implementation Method 2

[0087] Next, a carbon dioxide recovery system 2A according to Embodiment 2 will be described. Since the basic structure of the carbon dioxide recovery system 2A according to this embodiment is the same as that of Embodiment 1, the description will be mainly focused on the differences.

[0088] In this embodiment, if Figure 5As shown, the carbon dioxide recovery system 2A further includes a carbon dioxide sensor 60 . The carbon dioxide sensor 60 measures the carbon dioxide concentration in the room. The carbon dioxide sensor 60 is connected to the control device 50 .

[0089] Moreover, in the present embodiment, the control device 50 operates the indoor air blower 16 based on the measurement result of the carbon dioxide sensor 60. A first threshold value is stored in the control device 50. The first threshold value is a value related to the concentration of the carbon dioxide sensor 60. For example, if the carbon dioxide concentration in the room exceeds 1000ppm, it can generally be said that the carbon dioxide concentration is high. Therefore, the first threshold value may also be 1000ppm. However, the first threshold value is not limited to 1000ppm and can be set appropriately. For example, as the first threshold value, the carbon dioxide concentration in the general air can be used. As the first threshold value, a value based on the results of a prior verification test (including not only a test of an actual machine but also a simulation) can also be used.

[0090] Next, a carbon dioxide recovery method using the carbon dioxide recovery system 2A of this embodiment is described. In this recovery method, the control device 50 does not operate the compressor 13 and the indoor blower 16 together, and does not perform indoor air conditioning. However, the control device 50 may also operate the compressor 13 and the indoor blower 16 together to perform indoor air conditioning.

[0091] like Figure 5 As shown, the control device 50 obtains the indoor carbon dioxide concentration from the carbon dioxide sensor 60 (S21). When the carbon dioxide concentration is lower than the first threshold, the control device 50 does not operate the indoor fan 16 (S22). In this case, the control device 50 continues to obtain the carbon dioxide concentration, and when the carbon dioxide concentration becomes higher than the first threshold, the next process is implemented.

[0092] When the carbon dioxide concentration is higher than the first threshold value, the control device 50 operates the indoor air blower 16 and causes the carbon dioxide recovery device 30 to recover carbon dioxide (S23). At this time, the air supply power of the indoor air blower 16 can also be used for separation from the carbon dioxide recovery device 30. In addition, at this time, the outdoor air blower 15 can also be operated. The control device 50 continues to obtain the carbon dioxide concentration, and when the carbon dioxide concentration becomes lower than the first threshold value (S24), the indoor air blower 16 is stopped (S25). After that, the control device 50 continues to obtain the carbon dioxide concentration and repeats the above-mentioned judgment and processing.

[0093] In addition, in this embodiment and the following embodiments, the expression of the case where the carbon dioxide concentration is lower than the first threshold value (hereinafter referred to as the low case) and the expression of the case where the carbon dioxide concentration is higher than the first threshold value (hereinafter referred to as the high case) are used. The case where the carbon dioxide concentration is consistent with the first threshold value may be included in either case as long as it is included in only one of the low case and the high case.

[0094] Implementation 3

[0095] Next, a carbon dioxide recovery system 2B according to Embodiment 3 will be described. Since the basic structure of the carbon dioxide recovery system 2B according to this embodiment is the same as that of Embodiment 2, the description will be mainly focused on the differences.

[0096] like Figure 7 As shown, in the carbon dioxide recovery system 2B of this embodiment, the air conditioning device 10 includes a plurality of indoor units 12. A carbon dioxide recovery device 30 is provided in each indoor unit 12. In addition, the air conditioning device 10 may also include a common outdoor unit 11 for the plurality of indoor units 12. The air conditioning device 10 may also include an outdoor unit 11 for each of the plurality of indoor units 12.

[0097] In the carbon dioxide recovery method using the carbon dioxide recovery system 2B of the present embodiment, for example, the control device 50 may change the number of operating indoor blowers 16 (the number of operating indoor units 12 ) according to the carbon dioxide concentration.

[0098] Implementation 4

[0099] Next, a carbon dioxide recovery system 2C according to Embodiment 4 will be described. Since the basic structure of the carbon dioxide recovery system 2C according to this embodiment is the same as that of Embodiment 3, the description will be mainly focused on the differences.

[0100] like Figure 8 As shown, in the carbon dioxide recovery system 2C of this embodiment, the air conditioning device 10 includes a first indoor unit 12a and a second indoor unit 12b as indoor units 12. The first indoor unit 12a is an indoor unit 12 provided with a carbon dioxide recovery device 30. The second indoor unit 12b is an indoor unit 12 not provided with a carbon dioxide recovery device 30.

[0101] Next, a carbon dioxide recovery method using the carbon dioxide recovery system 2C of the present embodiment will be described. In this recovery method, the control device 50 executes the method when receiving an input to start air conditioning from a user (S30), for example.

[0102] like Fig. 9As shown, the control device 50 obtains the indoor carbon dioxide concentration from the carbon dioxide sensor 60 (S31). When the carbon dioxide concentration is lower than the first threshold value, the control device 50 operates the second indoor unit 12b (S32). In this case, the control device 50 may operate the first indoor unit 12a when it is determined to operate more indoor units 12 based on the air conditioning conditions.

[0103] When the carbon dioxide concentration is higher than the first threshold value, the control device 50 operates the first indoor unit 12a and causes the carbon dioxide recovery device 30 to recover carbon dioxide (S33). At this time, the air supply power of the indoor air supply fan 16 can also be used for separation from the carbon dioxide recovery device 30. The control device 50 continues to obtain the carbon dioxide concentration, and when the carbon dioxide concentration becomes lower than the first threshold value (S34), the second indoor unit 12b is operated instead of the first indoor unit 12a (S35). After that, the control device 50 continues to obtain the carbon dioxide concentration and repeats the above-mentioned judgment and processing.

[0104] As described above, in the carbon dioxide recovery method of this embodiment, the control device 50 gives priority to operating the indoor blower 16 of the first indoor unit 12a when the carbon dioxide concentration is higher than the first threshold value, and gives priority to operating the indoor blower 16 of the second indoor unit 12b when the carbon dioxide concentration is lower than the first threshold value.

[0105] As described above, according to the carbon dioxide recovery systems 2A, 2B, and 2C of Embodiments 2 to 4, the control device 50 operates the indoor blower 16 based on the measurement result of the carbon dioxide sensor 60. Thus, the amount of carbon dioxide recovered by the carbon dioxide recovery device 30 can be changed according to the indoor carbon dioxide concentration.

[0106] When the carbon dioxide concentration is higher than the first threshold, the control device 50 preferentially operates the indoor blower 16 of the first indoor unit 12a, and when the carbon dioxide concentration is lower than the first threshold, the control device 50 preferentially operates the indoor blower 16 of the second indoor unit 12b. Therefore, the recovery amount of carbon dioxide of the carbon dioxide recovery device 30 can be adjusted with high accuracy according to the indoor carbon dioxide concentration.

[0107] Implementation method 5

[0108] Next, a carbon dioxide recovery system 2D according to Embodiment 5 will be described. Since the basic structure of the carbon dioxide recovery system 2D according to this embodiment is the same as that of Embodiment 2, the description will be mainly focused on the differences.

[0109] In this embodiment, if Fig.10As shown, the carbon dioxide recovery system 2D includes an infrared sensor 70 instead of the carbon dioxide sensor 60. The infrared sensor 70 measures the indoor temperature. The carbon dioxide sensor 60 is connected to the control device 50. As the infrared sensor 70, an infrared sensor 70 built in the indoor unit 12 may be used.

[0110] Moreover, in the present embodiment, the control device 50 operates the indoor air blower 16 based on the measurement result of the infrared sensor 70. For example, the control device 50 can estimate the presence or absence of a living being (e.g., a person) in the room and the number of living beings (the number of people) based on the measurement result of the infrared sensor 70. When a living being exists in the room (in the room) or the number of living beings is large (the number of people is large), the control device 50 determines that the carbon dioxide concentration in the room is high.

[0111] Next, a carbon dioxide recovery method using the carbon dioxide recovery system 2D of this embodiment is described. In this recovery method, the control device 50 does not operate the compressor 13 and the indoor blower 16 together, and does not perform indoor air conditioning. However, the control device 50 may also operate the compressor 13 and the indoor blower 16 together to perform indoor air conditioning.

[0112] like Figure 5 As shown, the control device 50 detects the carbon dioxide concentration in the room from the infrared sensor 70 (S41). When the control device 50 determines that the carbon dioxide concentration is low (no one is indoors, few people), it does not operate the indoor fan 16 (S42). In this case, the control device 50 continues to obtain the measurement results from the infrared sensor 70, and when it is determined that the carbon dioxide concentration has increased, the next process is implemented.

[0113] When the control device 50 determines that the carbon dioxide concentration is high (indoors, with many people), the control device 50 operates the indoor blower 16 to cause the carbon dioxide recovery device 30 to recover carbon dioxide (S43). At this time, the air supply power of the indoor blower 16 can also be used for separation from the carbon dioxide recovery device 30. After that, the control device 50 continues to obtain the carbon dioxide concentration and repeats the above-mentioned determination and processing.

[0114] As described above, according to the carbon dioxide recovery system 2D of this embodiment, the control device 50 operates the indoor fan 16 based on the detection results of the infrared sensor 70, thereby being able to adjust the amount of carbon dioxide recovered by the carbon dioxide recovery device 30 according to, for example, the presence or absence of living organisms in the room and the number of living organisms.

[0115] Implementation 6

[0116] Next, a description will be given of a carbon dioxide recovery method according to Embodiment 6. The carbon dioxide recovery system 2, 2A, 2B, 2C, 2D of this embodiment is preferably the carbon dioxide recovery system 2, 2A, 2B, 2C, 2D of any one of Embodiments 1 to 5 described above.

[0117] In the present embodiment, first, the power supply system 80 for supplying power to the carbon dioxide recovery systems 2, 2A, 2B, 2C, and 2D will be described.

[0118] like Fig.12 and Fig.13 As shown, the power supply system 80 includes a power generation system 81 and a battery 82 .

[0119] The power generation system 81 is a power generation system 81 provided outside the carbon dioxide recovery system 2, 2A, 2B, 2C, 2D. As the power generation system 81, for example, a power generation system 81 using renewable energy can be listed. As the renewable energy, for example, solar energy can be listed. However, the power generation system 81 is not limited to the power generation system 81 using renewable energy, and for example, it can also be a power generation system 81 using thermal power. In the following, the power generated by the power generation system 81 is set to the first power. The power generation system 81 can supply the first power to both the battery 82 and the carbon dioxide recovery system 2, 2A, 2B, 2C, 2D.

[0120] The storage battery 82 receives the first power and stores the power. A known structure can be adopted as the storage battery 82. Hereinafter, the power generated by the storage battery 82 is referred to as the second power. The storage battery 82 can supply the second power to the carbon dioxide recovery systems 2, 2A, 2B, 2C, and 2D.

[0121] Next, the carbon dioxide recovery method of this embodiment is described. In this recovery method, for the carbon dioxide recovery system 2, 2A, 2B, 2C, 2D, as shown in FIG. Fig.12 As shown, during the first period, the first electricity is used to recover carbon dioxide, such as Fig.13 As shown, the carbon dioxide is recovered by using the second electricity in the second period. For example, when the power generation system 81 is a power generation system 81 using solar energy, the daytime when the power generation system 81 generates a large amount of power can be listed as the first period, and the nighttime when the power generation system 81 generates a small amount of power can be listed as the second period. The judgment of daytime and nighttime can be based on the amount of sunshine, or can be based on the time. In addition, the judgment of daytime and nighttime (the judgment of the first period and the second period) can be judged by the control device 50, for example.

[0122] In this embodiment, if Fig.12As shown, during the first period, the power generation system 81 supplies the first power to both the storage battery 82 and the carbon dioxide recovery system 2, 2A, 2B, 2C, 2D. The storage battery 82 stores the first power during the first period. Then, during the second period, the power generation system 81 stops supplying power to the carbon dioxide recovery system 2, 2A, 2B, 2C, 2D, and the storage battery 82 supplies the second power to the carbon dioxide recovery system 2, 2A, 2B, 2C, 2D.

[0123] Implementation 7

[0124] Next, a carbon dioxide recovery method according to Embodiment 7 will be described. Since the basic structure of the carbon dioxide recovery method according to this embodiment is the same as that of Embodiment 6, the description will be mainly focused on the differences.

[0125] In this embodiment, if Fig.14 and Fig.15 As shown, the power supply system 80 includes a gas generation system 83 , a gas storage device 84 , and a generator 85 instead of the battery 82 .

[0126] The gas generation system 83 and the gas storage device 84 convert the first power into gas and store the gas.

[0127] The gas generation system 83 generates gas by receiving the first power. Examples of the gas include hydrogen and methane.

[0128] The gas storage device 84 stores the gas generated by the gas generation system 83. The gas storage device 84 may also condense the gas for storage.

[0129] The generator 85 generates electricity based on the gas supplied from the gas storage device 84. The generator 85 can supply the generated electricity to the carbon dioxide recovery systems 2, 2A, 2B, 2C, and 2D. Hereinafter, the electricity supplied by the generator 85 is referred to as third electricity.

[0130] In addition, the gas generation system 83, the gas storage device 84, and the generator 85 adopt a known structure as appropriate. For example, the generator 85 may be a fuel cell (SOFC fuel cell).

[0131] Next, the carbon dioxide recovery method of this embodiment is described. In this recovery method, for the carbon dioxide recovery system 2, 2A, 2B, 2C, 2D, as shown in FIG. Fig.14 As shown, during the third period, the first electricity is used to recover carbon dioxide, such as Fig.15As shown, the third power is used to recover carbon dioxide during the fourth period. For example, when the power generation system 81 is a power generation system 81 using solar energy, the third period may include the daytime when the power generation system 81 generates a large amount of power, and the fourth period may include the nighttime when the power generation system 81 generates a small amount of power. The judgment between daytime and nighttime may be based on the amount of sunshine or the time of day. In addition, the judgment between daytime and nighttime (the judgment between the third period and the fourth period) may also be made by the control device 50, for example.

[0132] In this embodiment, if Fig.14 As shown, during the third period, the power generation system 81 supplies the first power to both the gas generation system 83 and the carbon dioxide recovery system 2, 2A, 2B, 2C, 2D. The gas generation system 83 converts the first power into gas during the third period and stores it in the gas storage device 84. Then, during the fourth period, the power generation system 81 stops supplying power to the carbon dioxide recovery system 2, 2A, 2B, 2C, 2D, and the generator 85 supplies the third power to the carbon dioxide recovery system 2, 2A, 2B, 2C, 2D.

[0133] As described above, according to the carbon dioxide recovery method of embodiments 6 and 7, the first power can be stored in the form of electricity or converted into gas for storage during a specific period (first period, third period) such as daytime, and carbon dioxide can be recovered using the stored power (second power) or the power (third power) generated by the converted gas during other periods (second period, fourth period) such as nighttime. Therefore, even if power is supplied from the power generation system 81 with large deviation in power generation such as renewable energy, carbon dioxide can be stably recovered.

[0134] In addition, the technical scope of the present disclosure is not limited to the above-mentioned embodiment, and various modifications can be added within the scope not departing from the gist of the present disclosure.

[0135] The control device 50 includes, for example, a computer system. In addition, a program for realizing the functions of each structure of the carbon dioxide recovery system 2, 2A, 2B, 2C, and 2D may be stored in a computer-readable storage medium, and the processing in each structure may be performed by causing the computer system to read and execute the program stored in the storage medium. Here, "causing the computer system to read and execute the program stored in the storage medium" includes a computer system installation program. The "computer system" mentioned here includes hardware such as an OS and peripheral devices.

[0136] In addition, a "computer system" may also include a plurality of computer devices connected via a network, including the Internet or a communication line such as a WAN, LAN, or a dedicated line. In addition, a "computer-readable storage 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 storage medium storing the program may also be a non-temporary storage medium such as a CD-ROM.

[0137] In addition, the storage medium also includes an internal or external storage medium that can be accessed from the publishing server in order to publish the program. In addition, it is also possible to divide the program into multiple parts and download them at different times and then combine them in each structure possessed by the carbon dioxide recovery system 2, 2A, 2B, 2C, and 2D. In addition, the publishing servers that publish the divided programs can also be different. And "computer-readable storage medium" also includes a storage medium that keeps the program for a certain period of time, such as a server in the case of sending the program via a network or a volatile memory (RAM) inside a computer system that becomes a client. In addition, the above program may also be a program for realizing a part of the above functions. And it may also be a program that can realize the above functions by combining with a program already stored in the computer system, i.e., a so-called differential file (differential program).

[0138] In addition, all or part of the functions of each control device 50 may be implemented using hardware such as an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array).

[0139] In addition to these, the above-mentioned embodiments or modifications may be combined as appropriate.

[0140] Description of Reference Numerals

[0141] 1 Resource Generation System

[0142] 2. 2A, 2B, 2C, 2D CO2 recovery system

[0143] 3 Carbon dioxide storage device

[0144] 4 Carbon dioxide resource recovery system

[0145] 10 Air conditioning unit

[0146] 11 Outdoor unit

[0147] 12 Indoor Unit

[0148] 12a First indoor unit

[0149] 12b Second indoor unit

[0150] 13 Compressor

[0151] 14 Heat exchanger

[0152] 15 Outdoor fan

[0153] 16 Indoor fan

[0154] 30 Carbon dioxide recovery device

[0155] 50 Control device

[0156] 60 Carbon dioxide sensor

[0157] 70 Infrared sensor

[0158] 81 Power Generation System

[0159] 82 Batteries

[0160] 85 Generator.

Claims

1. A carbon dioxide recovery system, wherein: The carbon dioxide recovery system comprises: An air conditioning device, the air conditioning device comprising an outdoor unit including a compressor, a heat exchanger, and an outdoor blower, and at least one indoor unit including an indoor blower; and A carbon dioxide recovery device is provided downstream or upstream of the outdoor blower or the indoor blower, and recovers carbon dioxide by using the air supplied by the outdoor blower or the indoor blower.

2. The carbon dioxide recovery system according to claim 1, wherein: The device further includes a control device that controls at least the air conditioning device among the air conditioning device and the carbon dioxide recovery device.

3. The carbon dioxide recovery system according to claim 2, wherein: The control device operates at least one of the outdoor air-sending fan and the indoor air-sending fan in a state where the compressor is stopped.

4. The carbon dioxide recovery system according to claim 2 or 3, wherein: The control device is capable of operating the air conditioning device in a first operation mode or a second operation mode. The air conditioning device operating in the first operation mode operates at a capacity lower than a rated capacity of the air conditioning device, The air conditioning device operating in the second operation mode operates with the air supply capacity of at least one of the outdoor fan and the indoor fan increased compared to when the air conditioning device is operating in the first operation mode. The control device operates the air conditioner in the second operation mode when it is determined based on air conditioning conditions that the air conditioner is to be operated in the first operation mode and when it is determined based on carbon dioxide recovery conditions that the carbon dioxide recovery capability is to be increased.

5. The carbon dioxide recovery system according to any one of claims 2 to 4, wherein: The control device controls at least the air conditioning device among the air conditioning device and the carbon dioxide recovery device so that the heat energy or cold energy of the refrigerant of the air conditioning device becomes at least a part of the heat source for recovery or separation of carbon dioxide performed by the carbon dioxide recovery device.

6. The carbon dioxide recovery system according to any one of claims 2 to 5, wherein: A carbon dioxide sensor is also provided, the carbon dioxide sensor is connected to the control device and measures the carbon dioxide concentration in the room, The carbon dioxide recovery device is arranged downstream or upstream of the indoor air blower. The control device operates the indoor fan based on a measurement result of the carbon dioxide sensor.

7. The carbon dioxide recovery system according to claim 6, wherein: The air-conditioning apparatus includes a plurality of the indoor units.

8. The carbon dioxide recovery system according to claim 7, wherein: The air conditioning device includes a first indoor unit and a second indoor unit as the indoor units, the first indoor unit is an indoor unit provided with the carbon dioxide recovery device, and the second indoor unit is an indoor unit not provided with the carbon dioxide recovery device. When the carbon dioxide concentration is higher than a first threshold, the control device preferentially operates the indoor fan of the first indoor unit, and when the carbon dioxide concentration is lower than the first threshold, the control device preferentially operates the indoor fan of the second indoor unit.

9. The carbon dioxide recovery system according to any one of claims 2 to 8, wherein: It also includes an infrared sensor, which is connected to the control device and measures the indoor temperature. The carbon dioxide recovery device is arranged downstream or upstream of the indoor air blower. The control device operates the indoor fan based on the detection result of the infrared sensor.

10. A resource generation system, wherein: The resource generation system comprises: The carbon dioxide recovery system according to any one of claims 1 to 9; a carbon dioxide storage device that stores carbon dioxide recovered by the carbon dioxide recovery system; and The carbon dioxide resource recovery system is configured to supply carbon dioxide from the carbon dioxide storage device to the carbon dioxide resource recovery system.

11. A method for recovering carbon dioxide, the method comprising: using the carbon dioxide recovery system according to any one of claims 1 to 9, wherein: The carbon dioxide recovery device recovers carbon dioxide using air supplied by the outdoor air blower or the indoor air blower.

12. A method for recovering carbon dioxide, the method comprising: using the carbon dioxide recovery system according to any one of claims 1 to 9, wherein: The carbon dioxide recovery device utilizes heat energy or cold energy of the refrigerant of the air conditioning device as at least a part of a heat source for recovery or separation of carbon dioxide.

13. The carbon dioxide recovery method according to claim 11 or 12, wherein: As electric power, first electric power and second electric power are supplied to the carbon dioxide recovery system, the first electric power being electric power from a power generation system outside the carbon dioxide recovery system, and the second electric power being electric power from a storage battery storing the first electric power, The carbon dioxide is recovered using the first electric power during the first period, and the carbon dioxide is recovered using the second electric power during the second period.

14. The carbon dioxide recovery method according to any one of claims 11 to 13, wherein: As electric power, first electric power and third electric power are supplied to the carbon dioxide recovery system, the first electric power being electric power from a power generation system external to the carbon dioxide recovery system, and the third electric power being electric power from a generator that generates electric power based on gas generated using the first electric power, In the third period, the first electricity is used to generate and store gas, and in the fourth period, the third electricity is used to recover carbon dioxide.

15. The carbon dioxide recovery method according to claim 14, wherein: The generator is a fuel cell.

16. The method for recovering carbon dioxide according to claim 14 or 15, wherein: The gas is hydrogen or methane.

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