Carbon dioxide recovery device, carbon dioxide recovery process and carbon dioxide recovery system

Abstract

A carbon dioxide recovery device according to the present invention comprises an air-permeable container arranged outside an elevator car or outside a counterweight in a shaft of the elevator car, and an adsorbent that adsorbs carbon dioxide and is contained in the container.

Description

Technical area

[0001] The present invention relates to a carbon dioxide recovery apparatus, a carbon dioxide recovery method and a carbon dioxide recovery system. State of the art

[0002] Patent Document 1 discloses a technology for removing carbon dioxide from the air using an adsorbent that can adsorb carbon dioxide. Literature listPatent document

[0003] Patent Document 1: Unexamined Japanese Patent Application Publication JP 2020- 131 166 A Brief description of the inventionProblem to be solved by the invention

[0004] When carbon dioxide is adsorbed by an adsorbent, the carbon dioxide concentration in the air at the surface of the adsorbent progressively decreases. As the carbon dioxide concentration decreases, the carbon dioxide recovery efficiency by the adsorbent decreases. Therefore, to maintain carbon dioxide recovery efficiency, it is preferable to continuously expose the adsorbent to air where the carbon dioxide concentration has not decreased. However, if, for example, equipment is provided solely for continuously exposing the adsorbent to air, the actual carbon dioxide recovery efficiency of the entire system may decrease due to the energy consumption of the equipment.

[0005] The present invention has been conceived in view of the above circumstances, and an object of the present invention is to provide a carbon dioxide recovery apparatus, a carbon dioxide recovery method, and a carbon dioxide recovery system that can maintain the efficiency of carbon dioxide recovery in an entire system. Solution to the problem

[0006] One aspect of a carbon dioxide recovery apparatus according to the present invention includes an air-permeable container disposed outside an elevator car or outside a counterweight in a shaft of the elevator car, and an adsorbent that adsorbs carbon dioxide and is contained in the container.

[0007] One aspect of a carbon dioxide recovery method according to the present invention comprises: a filling step of filling an adsorbent adsorbing carbon dioxide into an air-permeable container disposed outside an elevator car or outside a counterweight in a shaft of the elevator car; an adsorption step of causing carbon dioxide to be adsorbed by the adsorbent by moving the elevator car up and down to bring the adsorbent into contact with air containing carbon dioxide; and a recovery step of recovering the adsorbent that has adsorbed carbon dioxide from the container.

[0008] One aspect of a carbon dioxide recovery system according to the present invention includes the carbon dioxide recovery device, the elevator car, the counterweight, and a control panel that controls the upward and downward movement of the elevator car. Effects of the invention

[0009] The present invention makes it possible to provide a carbon dioxide recovery apparatus, a carbon dioxide recovery method, and a carbon dioxide recovery system that can maintain the efficiency of carbon dioxide recovery in the entire system. Short description of the drawings

[0010] The drawings show in: Fig. 1 is a schematic diagram of a carbon dioxide recovery system according to embodiment 1. Fig. 2 is a schematic diagram of a carbon dioxide recovery system according to embodiment 2. Fig. 3 a cross-sectional view along the line AA passing through the Fig. 2 is indicated by the arrow. Fig. 4 is a schematic diagram of a carbon dioxide recovery system according to embodiment 3. Fig. 5 a diagram showing the relationship between the loading ratio and the energy consumption in an elevator device. Fig. 6 is a schematic diagram of a carbon dioxide recovery system according to embodiment 4. Fig. 7 is a schematic diagram of a carbon dioxide recovery system according to embodiment 5. Fig. 8 is a schematic diagram of a part of a configuration of a carbon dioxide recovery system according to Embodiment 6. Description of the embodiments

[0011] Embodiments of the present invention will be described below with reference to the drawings. Furthermore, the scope of the present invention is not limited to the following embodiments and can be freely modified within the scope of the technical ideas of the present invention. Embodiment 1

[0012] Fig. 1 is a schematic diagram of a carbon dioxide recovery apparatus and a carbon dioxide recovery system according to Embodiment 1.

[0013] As in Fig. As shown in Figure 1, the carbon dioxide recovery system 1 includes a carbon dioxide recovery device 10 and an elevator device 20. The carbon dioxide recovery system 1 is located in a building B in which the elevator device 20 is installed.

[0014] The elevator device 20 includes an elevator car 21, a counterweight 22, a rope 23, a hoist 24, a control panel 25, and the like. The elevator car 21 and the counterweight 22 are arranged in a shaft P formed in the building B. Furthermore, the elevator car 21 and the counterweight 22 can move up and down in the shaft P. The elevator device 20 may be of a type for transporting passengers or may be of a type for transporting only freight.

[0015] The elevator car 21 and the counterweight 22 are each attached to one end of the rope 23. The lifting device 24 guides the rope 23 so that the elevator car 21 is moved up and down. The control panel 25 is electrically connected to the lifting device 24. The control panel 25 is arranged near the lifting device 24 in the figure, but can also be arranged further away from the lifting device 24.

[0016] The control panel 25 controls the length, speed, direction, or the like of the rope 23 guided by the hoist 24. Based on the control of the control panel 25, the elevator car 21 moves between each floor F of the building B and can stop at any floor F. In the figure, the number of floors F of the building B is three, but the number of floors F can also be two, four, or more.

[0017] The carbon dioxide recovery device 10 comprises a container 11 and an adsorbent 12. The carbon dioxide recovery device 10 is arranged outside the elevator car 21 or outside the counterweight 22 in the shaft P. In Fig. 1, the carbon dioxide recovery device 10 is attached to a bottom of the elevator car 21. However, the carbon dioxide recovery device 10 may also be attached to a top or bottom of the counterweight 22.

[0018] The container 11 is permeable to air. Thus, when the elevator car 21 and the counterweight 22 move upward and downward, air in the shaft P enters the interior of the container 11. Furthermore, the air in the container 11 is discharged into the shaft P. This means that the air in the container 11 can be replaced by the air in the shaft P by means of the upward and downward movement of the elevator car 21 and the counterweight 22.

[0019] The container 11 only needs to be able to accommodate the adsorbent 12 and be permeable to air. For example, if the adsorbent 12 is granular, a plurality of holes smaller than the grain size of the adsorbent 12 can be formed in the container 11. The container 11 can be entirely or partially mesh-like. The material of the container 11 can also be different, as needed, such as a metal or a resin. A structure other than the one described above can also be used for the container 11.

[0020] The adsorbent 12 contains 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. A plurality of the above-mentioned materials may also be selected and used, or a material other than one of the above-described materials may be used.

[0021] The adsorbent 12 can be in granular form (e.g., in the form of beads (spherical) or in the form of pellets (columnar)). Alternatively, the adsorbent 12 can also be used in powder form. In this case, the powdered adsorbent 12 can be applied to a surface of a base material. The base material can, for example, have the shape of a honeycomb structure.

[0022] The carbon dioxide recovery method according to the present embodiment includes a filling step, an adsorption step, and a recovery step.

[0023] In the filling step, the adsorbent 12 is filled into the container 11.

[0024] In the adsorption step, by moving the elevator car 21 up and down to bring carbon dioxide-containing air into contact with the adsorbent 12, carbon dioxide is adsorbed by the adsorbent 12.

[0025] In the recovery step, the adsorbent 12 that has adsorbed carbon dioxide is recovered from the container 11.

[0026] Furthermore, the recovery step can be performed, for example, during maintenance and inspection of the elevator device 20. During this process, the adsorbent 12 that has adsorbed carbon dioxide can be removed from the container 11, and new adsorbent 12 can be filled into the container 11. Alternatively, the container 11 can be completely replaced. The carbon dioxide can be extracted from the recovered adsorbent 12 and used to produce methane or the like.

[0027] As described above, the carbon dioxide recovery apparatus 10 according to the present embodiment includes the air-permeable container 11 disposed outside the elevator car 21 or outside the counterweight 22 in the shaft P of the elevator car 21, and the adsorbent 12 that adsorbs carbon dioxide and is contained in the container 11.

[0028] Furthermore, the carbon dioxide recovery method according to the present embodiment includes the filling step of filling the carbon dioxide-adsorbing adsorbent 12 into the air-permeable container 11 disposed outside the elevator car 21 or outside the counterweight 22 in the shaft P of the elevator car 21; the adsorption step of causing carbon dioxide to be adsorbed by the adsorbent 12 by moving the elevator car 21 up and down to bring the adsorbent 12 into contact with carbon dioxide-containing air; and the recovery step of recovering the adsorbent 12 that has adsorbed carbon dioxide from the container 11.

[0029] According to such a carbon dioxide recovery device 10 or such a carbon dioxide recovery method, the air in the container 11 can be efficiently replaced with the air in the shaft P by using an airflow generated in the shaft P when the elevator device 20 is in operation. Thus, air whose carbon dioxide concentration has been reduced by contact with the adsorbent 12 can be discharged from the container 11, and air whose carbon dioxide concentration has not been reduced can be taken into the container 11.

[0030] Thus, the efficiency of carbon dioxide recovery can be maintained. Furthermore, energy and costs can be saved compared to a case where, for example, a dedicated fan or the like is used to generate airflow, and the efficiency of carbon dioxide recovery can be maintained throughout the entire system.

[0031] The container 11 can also be attached to the top or bottom of the elevator car 21. In this case, the air is likely to hit the container 11 as the elevator car 21 moves up and down. Thus, the air in the container 11 can be more efficiently replaced by the air in the elevator shaft P, improving the efficiency of carbon dioxide recovery. Furthermore, the installation area of ​​the carbon dioxide recovery device 10 can be increased compared to a case where the container 11 is attached to the counterweight 22.

[0032] Since the amount of adsorbent 12 filled into the container 11 can be increased, the efficiency of carbon dioxide recovery can be improved. The container 11 can be attached to both the top and bottom of the elevator car 21. If the container 11 is attached not only to the top and bottom of the elevator car 21 but also to the outside of the counterweight 22, the recovery efficiency can be further improved.

[0033] For example, if the operating rate of the elevator device 20 is low, it is conceivable that an airflow has fewer opportunities to impact the carbon dioxide recovery device 10, thus reducing the efficiency of carbon dioxide recovery. Thus, when a stopping time of the elevator car 21 exceeds a threshold, the elevator car 21 can be moved upwards or downwards without any user intervention or the like. This control can be performed by the control panel 25 or other control devices. The threshold can be specified as needed, but may be, for example, 10 minutes.

[0034] In this way, when the elevator car 21 moves up and down, when the stopping time of the elevator car 21 exceeds the threshold, the efficiency of recovering carbon dioxide by the carbon dioxide recovery device 10 can be maintained even in a state where the operation rate of the elevator device 20 is low. Embodiment 2

[0035] Next, a carbon dioxide recovery system according to Embodiment 2 will be described. The carbon dioxide recovery system according to the present embodiment has a similar basic configuration to that according to Embodiment 1, and thus, the description thereof will focus on the different points.

[0036] In Embodiment 1, the carbon dioxide recovery device 10 is attached to the elevator car 21 or the counterweight 22 and moves up and down during the operation of the elevator device 20. In contrast, in the present embodiment, a carbon dioxide recovery device 10 as shown in the Fig. 2 and Fig. 3, attached to a wall surface of a shaft P. That is, in the present embodiment, the carbon dioxide recovery device 10 remains stationary in the shaft P even when an elevator device 20 is in operation.

[0037] In the example according to Fig. 2 and Fig. 3, a container 11 is arranged along a wall surface P1 in the shaft P. The container 11 is then filled with an adsorbent 12. The container 11 can be arranged over a plurality of floors F. Alternatively, a plurality of containers 11 can be arranged for each floor F.

[0038] When the container 11 is fixed in the shaft P as in the present embodiment, an airflow generated in the shaft P when the elevator device 20 is operating impinges on the stationary container 11. This airflow can replace the air in the container 11 with air in the shaft P. Then, the volume of the container 11 and the amount of the adsorbent 12 filled in the container 11 can be increased. This can further improve the efficiency of carbon dioxide recovery. Embodiment 3

[0039] Next, a carbon dioxide recovery system according to Embodiment 3 will be described. The carbon dioxide recovery system according to the present embodiment has a similar basic configuration to that according to Embodiment 1, and thus, the description thereof will focus on the different points.

[0040] As in Fig. 4, in the present embodiment, a separation device b1 and a methanation system b2 are arranged in a building B.

[0041] The separation device b1 functions to separate carbon dioxide from an adsorbent 12. The separation device b1 may include a heater and separate carbon dioxide by heating the adsorbent 12 (e.g., to 60°C to 120°C). The heating temperature may be appropriately changed according to the specific material of the adsorbent 12. Alternatively, the separation device b1 may include a vacuum pump and separate the carbon dioxide by reducing the pressure on the adsorbent 12.

[0042] The methanation system b2 functions to generate methane using carbon dioxide, water, electricity, and the like. The methanation system b2 can generate methane using electricity generated with renewable energy (e.g., sunlight or the like). Solar cells or the like can be arranged in the building B for the operation of the methanation system b2.

[0043] A carbon dioxide recovery system 1 according to the present embodiment circulates the adsorbent 12 as follows.

[0044] First, the carbon dioxide is adsorbed by the adsorbent 12 in the shaft P.

[0045] Next, the adsorbent 12 is supplied from a container 11 to the separation device b1.

[0046] Next, the carbon dioxide is separated from the adsorbent 12 by the separation device b1.

[0047] Next, the captured carbon dioxide is fed to the methanation system b2, and methane is produced in the methanation system b2.

[0048] Next, the adsorbent 12 from which the carbon dioxide has been separated is supplied to the container 11 and filled into the container 11.

[0049] Furthermore, a storage tank for storing the adsorbent 12 may be arranged after the carbon dioxide separation. In this case, the above-described circulation of the adsorbent 12 can be carried out without delay.

[0050] Here, when the adsorbent 12 is filled into the container 11, the amount of the adsorbent 12 filled into the container 11 can be changed according to the loading ratio of an elevator car 21. For example, the amount of the adsorbent 12 filled into the container 11 can be controlled via a control panel 25. The loading ratio of the elevator car 21 can be determined by the following expression (1). In the expression (1), R is the loading ratio (%), x1 is the weight of the elevator car 21, x2 is the loading weight in the elevator car 21, x3 is the weight of a carbon dioxide recovery device 10 attached to the elevator car 21, and n is the allowable weight. R=(x1+x2+x3) / n×100

[0051] Furthermore, a value of (x1 + x2 + x3) can be detected, for example, using a sensor that measures the load applied to a rope 23. The control panel 25 can calculate the loading ratio R based on the value of x1 + x2 + x3 measured by the sensor.

[0052] Fig. 5 is a diagram illustrating the relationship between the loading ratio R and the energy consumption of an elevator device 20. As in Fig. As shown in Figure 5, the energy consumption of the elevator device 20 is lowest when the loading ratio R is 50%. Thus, when the loading ratio R is 50% or less, the adsorbent 12 can be filled into the container 11 (that is, the value of x3 can be increased) to further approximate the loading ratio R to 50%.

[0053] In this case, the energy consumption of the elevator device 20 can be reduced by filling the adsorbent 12 into the container 11. Preferably, the amount of the adsorbent 12 filled into the container 11 should be controlled so that the loading ratio R becomes 50%. Embodiment 4

[0054] Next, a carbon dioxide recovery system according to Embodiment 4 will be described. The carbon dioxide recovery system according to the present embodiment has a similar basic configuration to that according to Embodiment 3, and thus, the description thereof will focus on the different points.

[0055] As in Fig. 6, in the present embodiment, a blower b3 is arranged in a building B. The blower b3 is arranged on each floor F and blows the air in the floor F into the shaft P. The carbon dioxide concentration of the air in the floor F often increases due to human breath. Thus, when the air in the floor F is blown into the shaft P, the carbon dioxide concentration in the shaft P can be increased. A step of increasing the carbon dioxide concentration in the shaft P is referred to as a "concentration increasing step" in this specification.

[0056] That is, a carbon dioxide recovery method according to the present embodiment includes the concentration-increasing step in addition to the filling step, the adsorption step, and the recovery step. In the concentration-increasing step, the carbon dioxide concentration in the shaft P is increased by supplying air from the floor F into the shaft P. Thus, the efficiency of carbon dioxide recovery by a carbon dioxide recovery device 10 can be further improved.

[0057] Furthermore, the carbon dioxide concentration in the shaft P can also be increased using devices other than the blower b3. Embodiment 5

[0058] Next, a carbon dioxide recovery system according to Embodiment 5 will be described. The carbon dioxide recovery system according to the present embodiment has a similar basic configuration to that according to Embodiment 3, and thus, the description thereof will focus on the different points.

[0059] As in Fig. 7, in the present embodiment, ventilation openings A1 and A2 are arranged in a shaft P. In Fig. 7, the number of vents A1 and A2 is two, but this number can be changed as needed and can also be one, three, or more. The first vent A1 is located at an upper end portion of the shaft P, and the second vent A2 is located at a lower end portion of the shaft P.

[0060] As the adsorption of carbon dioxide by a carbon dioxide recovery device 10 progresses, the carbon dioxide concentration in the air in the shaft P progressively decreases. As the carbon dioxide concentration decreases, the efficiency of carbon dioxide recovery by the carbon dioxide recovery device 10 decreases. Thus, in the present embodiment, outside air is introduced into the shaft P through the vents A1 and A2. This allows the carbon dioxide concentration in the shaft P to be returned to the same level as that of the outside air, so that a decrease in the efficiency of carbon dioxide recovery can be suppressed.

[0061] Furthermore, the ventilation openings A1 and A2 can be simple openings. Ventilation fans can also be arranged at the ventilation openings A1 and A2 to actively cause outside air to flow into the shaft P. Outside air can be directed into the shaft P through one of the ventilation openings A1, A2, and the air in the shaft P can be exhausted through the other of the ventilation openings A1, A2. Embodiment 6

[0062] Next, a carbon dioxide recovery system according to Embodiment 6 will be described. The carbon dioxide recovery system according to the present embodiment has a similar basic configuration to that according to Embodiment 1, and thus, the description thereof will focus on the different points.

[0063] In the present embodiment, a case will be described in which a building B has a plurality of elevator devices 20.

[0064] For example, in an elevator lobby of a building or residential complex, a plurality of elevator devices are often arranged in parallel to shorten the waiting time for an elevator. When one or more elevator devices 20 are on standby, even if the other elevator devices 20 are operating for carbon dioxide recovery, an increase in passenger waiting time can be avoided. That is, when the elevator device 20 is operated in a state where there are no passengers or the like on board, the waiting time can be effectively utilized for carbon dioxide recovery.

[0065] Thus, in the present embodiment, a configuration as shown in Fig.8 is used. That is, a carbon dioxide recovery system 1 includes a plurality of elevator devices 20 and 20A. The structure of the elevator device 20A may be the same as that of the elevator device 20. The elevator device 20A includes an elevator car 21A, a hoist 24A, and a control panel 25A. The control panel 25A controls the hoist 24A to move the elevator car 21A up and down.

[0066] Furthermore, communication takes place between an operation panel 25 and the operation panel 25A, and the operating state of both is shared. A carbon dioxide recovery device 10 may be mounted on the elevator car 21A, similar to the first elevator car 21 according to Embodiment 1. Alternatively, the elevator cars 21 and 21A may be arranged in a common shaft P, and the carbon dioxide recovery device 10 may be mounted in the shaft P, as in Embodiment 2.

[0067] The control panels 25 and 25A communicate with each other, and when one of the elevator cars 21 and 21A is stopped, the other is moved up or down. For example, when the elevator car 21 is stopped, the elevator car 21A is moved up and down. Since the airflow hits the carbon dioxide recovery device 10 when the elevator car 21A moves up and down, the recovery of carbon dioxide by the adsorbent 12 can be promoted.

[0068] As described above, the carbon dioxide recovery system 1 of the present embodiment includes a plurality of elevator cars (the first elevator car 21 and the second elevator car 21A) and a plurality of control panels (the first control panel 25 and the second control panel 25A). The control panel 25A communicates with the control panel 25 and moves the elevator car 21A up and down when the elevator car 21 is stopped.

[0069] This configuration improves the efficiency of carbon dioxide recovery while avoiding prolonged passenger waiting times. The same control system can also be used for a case where three or more elevators are arranged in parallel.

[0070] Furthermore, the technical scope of the present invention is not limited to the embodiments described above, and various modifications can be made within a scope that does not deviate from the spirit of the present invention.

[0071] For example, instead of the methanation system b2 described in Embodiment 3, or in addition to this methanation system, a cylinder capable of storing carbon dioxide may be provided. In this case, the carbon dioxide separated from the adsorbent 12 by the separation device b1 can be stored in the cylinder. The cylinder in which the carbon dioxide is stored can be transported to another location (such as a factory), and the carbon dioxide can then be used there.

[0072] Furthermore, the above-described embodiments and modified examples can also be combined as needed.

[0073] For example, in the carbon dioxide recovery system 1 in which the container 11 is mounted in the shaft P as in Embodiment 2, the adsorbent 12 can be caused to circulate as described with respect to Embodiment 3.

[0074] Furthermore, the above-described control panel 25 has a computer system therein. Then, a program for implementing functions of each configuration of the above-described carbon dioxide recovery system 1 can be recorded on a computer-readable recording medium, and the above-described processing can be performed in the control panel 25 by causing the computer system to read and execute the program recorded on the recording medium. Hardware other than the control panel 25 can also perform the above-described processing.

[0075] In this context, "causing the computer system to read and execute the program recorded on the recording medium" involves installing the program on the computer system. The "computer system" described here includes an operating system and hardware, such as peripheral devices.

[0076] The "computer system" may also include a plurality of computer devices connected via a network, including the Internet, or a communications line, such as a WAN, LAN, or leased line. The term "computer-readable recording medium" also refers to a portable medium, such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, as well as a storage device, such as a hard disk built into a computer system. Thus, the recording medium on which the program is stored may be a non-volatile recording medium, such as a CD-ROM.

[0077] The recording medium also includes an internal or external recording medium that can be accessed by a distribution server to deliver the program. Furthermore, a configuration may be used in which the program is divided into a plurality of parts, each of which is downloaded at a different time and then combined with each component of the carbon dioxide recovery system 1, and the distribution servers that deliver the divided parts of the program may be different.

[0078] Furthermore, the "computer-readable recording medium" includes a medium that stores a program for a specific time, such as volatile memory (RAM) within a computer system that serves as a server or client when transmitting programs over a network. The above-described program may also be a program for implementing some of the above-described functions. Furthermore, the program may be a so-called difference file (a difference program) that can implement the above-described functions in combination with a program already recorded on the computer system. List of reference symbols 1 carbon dioxide recovery system 10 Carbon dioxide recovery device 11 containers 12 adsorbents 21 elevator car 21A Second elevator car 22 Counterweight 25 Control panel 25A Second control panel A1, A2 ventilation opening F Floor P Shaft P1 wall area QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] JP 2020-131 166 A

[0003]

Claims

[1] Carbon dioxide recovery device comprising: - an air-permeable container arranged outside a lift car or outside a counterweight in a shaft of the lift car; and - an adsorbent that adsorbs carbon dioxide and is contained in the container. [2] The carbon dioxide recovery device according to claim 1, wherein the container is attached to at least one of a top and a bottom of the elevator car. [3] The carbon dioxide recovery device according to claim 1, wherein the container is mounted in the shaft. [4] Carbon dioxide recovery process comprising: - a filling step for filling a carbon dioxide adsorbent into an air-permeable container arranged outside an elevator car or outside a counterweight in a shaft of the elevator car; - an adsorption step for causing the adsorption of carbon dioxide by the adsorbent by moving the elevator car upwards and downwards to bring the adsorbent into contact with air containing carbon dioxide; and - a recovery step for recovering the adsorbent that has adsorbed carbon dioxide from the container. [5] The carbon dioxide recovery method according to claim 4, wherein the adsorbent is filled into the container so that the loading ratio of the elevator car becomes 50% in the filling step. [6] The carbon dioxide recovery method according to claim 4 or 5, further comprising a concentration increasing step of increasing the carbon dioxide concentration in the shaft by supplying air from a floor into the shaft. [7] Carbon dioxide recovery system comprising: - the carbon dioxide recovery device according to one of claims 1 to 3; - the elevator car; - the counterweight; and - a control panel that controls the upward and downward movement of the elevator car. [8] The carbon dioxide recovery system according to claim 7, wherein the control panel causes the adsorbent to be filled into the container when a loading ratio of the elevator car is 50% or less. [9] The carbon dioxide recovery system according to claim 7 or 8, wherein the control panel moves the elevator car up and down when a stopping time of the elevator car exceeds a threshold value. [10] A carbon dioxide recovery system according to any one of claims 7 to 9, further comprising: - a second elevator car; and - a second control panel that controls the upward and downward movement of the second elevator car, the second control panel communicating with the control panel and moving the second elevator car up and down when the elevator car has stopped. [11] A carbon dioxide recovery system according to any one of claims 7 to 10, wherein outside air is introduced into the shaft through a ventilation opening formed in the shaft.

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