Carbon dioxide capture equipment

Abstract

To provide a carbon dioxide recovery device capable of effectively improving the recovery rate of carbon dioxide without adding complex components.SOLUTION: A carbon dioxide recovery device 1 includes: a reactor 11 which has an adsorbent 12; an intake line 101 through which gas flows; an exhaust line 102 through which gas flows after passing through the adsorbent 12; an exhaust valve 31 which is disposed in the exhaust line 102 and capable of opening and closing the path of the exhaust line 102; a fan 61 which sends gas from the intake line 101 into the adsorbent 12 inside the reactor 11; and a control device 90 which, in an adsorption process in which the adsorbent 12 adsorbs carbon dioxide, executes first adsorption control in which airflow is generated by the fan 61 in a state where the path of the exhaust line 102 is opened by the exhaust valve 31, and second adsorption control in which airflow is generated to increase the internal pressure of the reactor 11 in a state where the path of the exhaust line 102 is closed by the exhaust valve 31 after the first adsorption control is executed.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a carbon dioxide capture device. [Background technology]

[0002] Conventionally, techniques for recovering carbon dioxide from carbon dioxide-containing gases such as the atmosphere have been known. This type of technique is described, for example, in Patent Document 1. Patent Document 1 describes a method for separating gaseous carbon dioxide from a gas mixture by cyclic adsorption / desorption using an adsorbent that adsorbs gaseous carbon dioxide. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2017-528318 Summary of the Invention [Problem to be solved by the invention]

[0004] Possible methods for increasing the amount of carbon dioxide captured include increasing the size of the equipment or improving the performance of the pump or heat source. However, changing the equipment configuration requires additional parts and may also increase the operating costs of the carbon dioxide capture equipment. There is room for improvement in conventional technology in terms of improving the carbon dioxide capture rate while avoiding the cost increase caused by changing the equipment configuration.

[0005] An object of the present invention is to provide a carbon dioxide capture device that can effectively improve the carbon dioxide capture rate without adding complex parts. [Means for solving the problem]

[0006] (1) The present invention relates to a reactor (e.g., reactor 11, reactor 11a, and reactor 11b described later) having an adsorbent (e.g., adsorbent 12 described later) therein, an intake line (e.g., intake line 101, intake line 101a described later) connected to the upstream side of the reactor and through which a gas containing carbon dioxide flows, an exhaust line (e.g., exhaust line 102, exhaust line 102a, and exhaust line 102b described later) connected to the downstream side of the reactor and through which the gas flows after passing through the adsorbent, and an exhaust opening / closing device (e.g., exhaust valve 31, exhaust valve 31a, and exhaust valve 31b described later) disposed on the exhaust line and capable of opening and closing a path of the exhaust line. b), an airflow generating device (for example, fan 61 described later) that generates an airflow that sends the gas from the intake line to the adsorbent inside the reactor, and a control device (for example, control device 90 described later) that performs a first adsorption control in an adsorption process in which the carbon dioxide is adsorbed by the adsorbent, in which the airflow generating device generates the airflow while the exhaust line path is opened by the exhaust opening and closing device, and a second adsorption control in which the airflow is generated while the exhaust line path is closed by the exhaust opening and closing device after the first adsorption control is performed, thereby increasing the internal pressure of the reactor.

[0007] (2) In the carbon dioxide capture device described in (1) above, the airflow generating device may be a fan disposed upstream of the reactor in the intake line.

[0008] (3) In the carbon dioxide recovery device described in (1) or (2) above, the control device may transition from the first adsorption control to the second adsorption control when the concentration of the carbon dioxide in the gas that has passed through the reactor exceeds a threshold value.

[0009] (4) In the carbon dioxide capture device described in (1) or (2) above, the control device may transition to the second adsorption control after a predetermined time has elapsed since the first adsorption control was executed.

[0010] (5) In the carbon dioxide recovery device according to the above (1) or (2), a plurality of the reactors (for example, reactors 11a and 11b described later) are arranged, and the control device may be able to perform the first adsorption control and the second adsorption control for each of the reactors at different timings.

Advantages of the Invention

[0011] According to the present invention, it is possible to provide a carbon dioxide recovery device that can effectively improve the carbon dioxide recovery rate without adding complicated components.

Brief Description of the Drawings

[0012] [Figure 1] It is a schematic diagram showing the configuration of a carbon dioxide recovery device according to an embodiment of the present invention. [Figure 2] It is a graph explaining the relationship between the carbon dioxide adsorption amount and the internal pressure of the reactor. [Figure 3] It is a flowchart showing an example of the flow of the adsorption control process by the control device of the carbon dioxide recovery device of the present embodiment. [Figure 4] It is a schematic diagram explaining the relationship between the fan and a plurality of reactors in the carbon dioxide recovery device according to a modified example.

Embodiments for Carrying Out the Invention

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0014] FIG. 1 is a schematic diagram showing the configuration of a carbon dioxide recovery device 1 according to an embodiment of the present invention. The carbon dioxide recovery device 1 is applied to a direct air capture technology (DAC: Direct Air Capture) for recovering carbon dioxide in the atmosphere, for example, to reduce the carbon dioxide concentration in the atmosphere. The carbon dioxide recovered by the carbon dioxide recovery device 1 is stored underground or reused as fuel or material.

[0015] As shown in FIG. 1, the carbon dioxide capture device 1 includes a reactor 11, an intake line 101, a fan 61, an intake valve 21, an exhaust line 102, an exhaust valve 31, a carbon dioxide line 150, a capture valve 51, a vacuum pump 62, a water restorer 63, a compressor 64, a carbon dioxide tank 65, a carbon dioxide sensor 80, and a control device 90.

[0016] The reactor 11 contains an adsorbent 12 for adsorbing carbon dioxide. The adsorbent 12 is a particulate material that adsorbs carbon dioxide at low temperatures (for example, in the range of -30°C to 50°C) and desorbs (releases) carbon dioxide at high temperatures (for example, in the range of 50°C to 110°C) when the ambient carbon dioxide concentration is low. An example of such an adsorbent 12 is a solid amine carbon dioxide adsorbent formed by supporting an amine on a porous material such as silica.

[0017] The reactor 11 alternately carries out an adsorption process in which carbon dioxide in a gas such as the air that has been taken in is adsorbed onto the adsorbent 12, and a desorption process in which the adsorbent 12 is desorbed by reducing pressure and heating after creating a vacuum state.

[0018] The intake line 101 is a pipe that takes in gas such as the atmosphere containing carbon dioxide and sends it to the reactor 11. The gas containing carbon dioxide is supplied to the inside of the reactor 11 through the intake line 101.

[0019] The fan 61 is disposed on the upstream side of the intake line 101 relative to the reactor 11. When the fan 61 is driven, it generates a gas flow from "intake" to "exhaust" through the intake line 101 relative to the reactor 11.

[0020] The intake valve 21 is disposed on the upstream side of the reactor 11 in the intake line 101. The intake valve 21 is controlled to an open state that opens the intake line 101 during the adsorption process, and is controlled to a closed state that closes the intake line 101 during the desorption process.

[0021] The exhaust line 102 is a pipe connected to the downstream side of the reactor 11. The gas (air) after carbon dioxide has been adsorbed by the adsorbent 12 is discharged to the outside through the exhaust line 102. The gas discharged through the exhaust line 102 has a higher ratio of nitrogen and oxygen due to the amount of carbon dioxide recovered.

[0022] The exhaust valve 31 is disposed in the exhaust line 102. The exhaust valve 31 is controlled to an open state that opens the path of the exhaust line 102 during the adsorption process, and is controlled to a closed state that closes the path of the exhaust line 102 during the desorption process.

[0023] The carbon dioxide line 150 is connected to the reactor 11. The carbon dioxide line 150 is a pipe for recovering the carbon dioxide desorbed in the desorption step, and high-concentration carbon dioxide flows through it.

[0024] Recovery valve 51 is disposed at the connection between carbon dioxide line 150 and reactor 11. Recovery valve 51 is controlled to an open state that connects carbon dioxide line 150 with the inside of reactor 11 during the desorption step in which carbon dioxide is recovered, and is controlled to a closed state that isolates carbon dioxide line 150 from the inside of reactor 11 during the adsorption step.

[0025] The vacuum pump 62 is disposed in the carbon dioxide line 150. By driving the vacuum pump 62, the carbon dioxide desorbed in the desorption step of the reactor 11 is sucked into the carbon dioxide line 150 and recovered.

[0026] The water restorer 63 is disposed downstream of the vacuum pump 62 in the carbon dioxide line 150. The water restorer 63 cools the gas that has passed through the vacuum pump 62, thereby recovering water from the gas and increasing the concentration of carbon dioxide.

[0027] The compressor 64 is disposed downstream of the water restorer 63 in the carbon dioxide line 150. The compressor 64 compresses the highly concentrated carbon dioxide recovered in the water restorer 63 and sends it to the carbon dioxide tank 65.

[0028] The carbon dioxide tank 65 is disposed downstream of the compressor 64 in the carbon dioxide line 150. The carbon dioxide tank 65 is a container for storing the carbon dioxide recovered through the carbon dioxide line 150.

[0029] The carbon dioxide sensor 80 is a carbon dioxide concentration detection unit that detects the carbon dioxide concentration at the outlet of the reactor 11. Information indicating the carbon dioxide concentration detected by the carbon dioxide sensor 80 is output to the control device 90 and is used to determine the end of adsorption.

[0030] The control device 90 controls the operation of devices used for adsorption and desorption of carbon dioxide, such as driving and stopping the devices. The control device 90 is, for example, a computer having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc. The control device 90 may be configured as a single device or multiple devices. The control device 90 may also be configured using an electric circuit such as a relay.

[0031] Next, we will explain the control for recovering carbon dioxide by the control device 90. The control device 90 of this embodiment achieves a high carbon dioxide adsorption rate by performing two types of adsorption control, namely, first adsorption control and second adsorption control, in the adsorption process of adsorbing carbon dioxide into the adsorbent 12.

[0032] In the first adsorption control, the control device 90 controls both the intake valve 21 and the exhaust valve 31 to an open state, and controls the recovery valve 51 to a closed state. Then, the control device 90 drives the fan 61 to send a gas containing carbon dioxide to the adsorbent 12 inside the reactor 11 through the intake line 101.

[0033] In the second adsorption control, the control device 90 performs control to increase the internal pressure of the reactor 11 in order to increase the carbon dioxide adsorption rate more than in the first adsorption control. Here, with reference to Fig. 2, the effect of increasing the adsorption rate by increasing the internal pressure of the reactor 11 will be described. Fig. 2 is a graph illustrating the relationship between the amount of carbon dioxide adsorption and the internal pressure of the reactor 11. In the graph of Fig. 2, the horizontal axis represents the carbon dioxide partial pressure (kPa), and the vertical axis represents the amount of carbon dioxide adsorption (g / kg).

[0034] In Figure 2, the relationship between the adsorption amount of the adsorbent 12 and the partial pressure of carbon dioxide when the temperature of the adsorbent 12 is low is shown by a solid line, and the relationship between the adsorption amount of the adsorbent 12 and the partial pressure of carbon dioxide when the temperature of the adsorbent 12 is high is shown by a dashed line.

[0035] In the example of Figure 2, consider the case where the supply concentration of carbon dioxide supplied to the reactor 11 is 400 ppm. Even if the supply concentration of carbon dioxide is the same, 400 ppm, it can be seen that there is a difference in the adsorption amount when the inside of the reactor 11 is at atmospheric pressure and when the inside of the reactor 11 is pressurized. In this example, it can be seen that the adsorption amount increases both when the temperature of the adsorbent 12 is low and when it is high. Note that in this embodiment, adsorption by the adsorbent 12 is carried out at room temperature to improve the adsorption rate.

[0036] After the first adsorption control, the control device 90 performs second adsorption control to increase the internal pressure of the reactor 11 and increase the partial pressure of carbon dioxide, thereby creating an environment in which carbon dioxide is easily adsorbed even at the end of the adsorption process. In the second adsorption control, the control device 90 performs a pressurized adsorption process in which the exhaust valve 31 is changed from an open state to a closed state and the fan 61 is driven while maintaining the intake valve 21 open and the recovery valve 51 closed.

[0037] Next, a transition condition for transitioning from the first adsorption control to the second adsorption control will be described. In this embodiment, the transition condition is set to be that the carbon dioxide concentration at the outlet of the reactor 11 is equal to or greater than a predetermined threshold. When the first adsorption control is performed, the adsorption reaction progresses and the adsorption amount approaches saturation, making it difficult for the adsorbent 12 to capture additional carbon dioxide. Therefore, the carbon dioxide concentration of the gas passing through the adsorbent 12 becomes higher as the adsorbent approaches saturation than before. The control device 90 monitors the carbon dioxide concentration at the outlet of the reactor 11 to determine whether the adsorbent 12 is approaching saturation. If the adsorbent approaches saturation, the control device 90 transitions from the first adsorption control to the second adsorption control, which has a higher adsorption rate. The threshold may be set by a demonstration experiment or the like as a carbon dioxide concentration indicating that the adsorbent 12 is approaching saturation, or may be theoretically calculated based on the device configuration or the like.

[0038] Furthermore, the transition condition can also be set to be that the first adsorption control has been performed for a predetermined time. The predetermined time is a time set in advance for the adsorbent 12 to approach a saturated state. The predetermined time may be set theoretically based on data such as the airflow rate of the fan 61, the airflow time of the fan 61, and the carbon dioxide concentration in the atmosphere, or may be set based on experiments using the carbon dioxide capture device 1.

[0039] Fig. 3 is a flowchart showing an example of the flow of adsorption control processing by the control device 90 of the carbon dioxide recovery device 1 of this embodiment. The flowchart in Fig. 3 is started when the state of the adsorbent 12 satisfies the conditions for performing the adsorption process. The conditions for performing the adsorption process are not particularly limited. For example, the processing in Fig. 3 is started when a temperature sensor (not shown) detects that the temperature of the adsorbent 12 has reached a temperature suitable for performing the adsorption process (for example, room temperature).

[0040] In step S11, the control device 90 executes a first adsorption control to send air to the adsorbent 12 that satisfies the execution conditions. By executing the first adsorption control, an airflow that flows through the intake line 101, the reactor 11, and the exhaust line 102 is generated by driving the fan 61, and carbon dioxide contained in the gas is adsorbed by the adsorbent 12.

[0041] In step S12, the control device 90 determines whether a transition condition for transitioning from the first adsorption control to the second adsorption control is satisfied. The transition condition is set such that the carbon dioxide concentration at the outlet of the reactor 11 is equal to or greater than a preset threshold value.

[0042] If the carbon dioxide concentration at the outlet of the reactor 11 detected by the carbon dioxide sensor 80 is equal to or greater than a preset threshold, the control device 90 proceeds to step S13 (step S12; Yes). If the carbon dioxide concentration detected by the carbon dioxide sensor 80 is not equal to or greater than a preset threshold, the control device 90 continues monitoring the carbon dioxide sensor 80 that detects the carbon dioxide concentration at the outlet of the reactor 11 (step S12; No).

[0043] In step S13, the control device 90 transitions from the first adsorption control to the second adsorption control. By executing the first adsorption control, the exhaust valve 31 on the outlet side of the reactor 11 is closed, and the internal pressure of the reactor 11 increases due to the continuously operating fan 61. As the internal pressure of the reactor 11 increases, the partial pressure of carbon dioxide also increases, resulting in a state in which the amount of adsorption increases compared to atmospheric pressure. After the processing of step S13, the adsorption process ends. After the adsorption process, a desorption process is executed in which carbon dioxide is desorbed from the adsorbent 12 of the reactor 11.

[0044] In the desorption step, the intake valve 21 and exhaust valve 31 of the reactor 11 are closed, and the recovery valve 51 is opened. The vacuum pump 62 is operated to draw air into the reactor 11 and reduce the pressure to create a vacuum or near-vacuum state. A heat source device (not shown) supplies thermal energy to the inside of the reactor 11, raising the temperature of the adsorbent 12 of the reactor 11. By controlling the temperature rise of the adsorbent 12, the adsorbent 12 is also heated to a predetermined temperature (e.g., 80°C) sufficient for the desorption step, and the carbon dioxide adsorbed in the adsorbent 12 is desorbed. Next, the vacuum pump 62 is driven, and the desorbed carbon dioxide is stored in the carbon dioxide tank 65 via the carbon dioxide line 150. After the desorption step, the adsorption step is performed again. The carbon dioxide capture device 1 alternately performs the adsorption step and the desorption step, compressing the desorbed carbon dioxide and storing it in the carbon dioxide tank 65, thereby removing and recovering carbon dioxide from the air.

[0045] As described above, the carbon dioxide recovery device 1 of this embodiment includes a reactor 11 having an adsorbent 12 therein, an intake line 101 connected to the upstream side of the reactor 11 and through which gas containing carbon dioxide flows, an exhaust line 102 connected to the downstream side of the reactor 11 and through which gas flows after passing through the adsorbent 12, an exhaust valve (exhaust opening and closing device) 31 arranged on the exhaust line 102 and capable of opening and closing the path of the exhaust line 102, a fan (airflow generating device) 61 that generates an airflow that sends gas from the intake line 101 to the adsorbent 12 inside the reactor 11, and a control device 90 that performs a first adsorption control in the adsorption process of adsorbing carbon dioxide into the adsorbent 12, in which the exhaust valve 31 opens the path of the exhaust line 102 and generates an airflow using the fan 61, and a second adsorption control that generates an airflow using the exhaust valve 31 and closes the path of the exhaust line 102 using the exhaust valve 31 after the first adsorption control is performed, thereby increasing the internal pressure of the reactor 11.

[0046] As a result, in the second adsorption control, since the downstream side of the reactor 11 is closed by the exhaust valve 31 and the blowing by the fan 61 continues, gas is no longer discharged through the exhaust line 102 and the internal pressure of the reactor 11 increases. As the internal pressure of the reactor 11 increases, the partial pressure of carbon dioxide in the reactor 11 improves, and the adsorption amount per unit time of the adsorbent 12 increases. Also, in the first adsorption control, since the exhaust valve 31 is open, continuous supply to the adsorbent 12 by the fan 61 is possible, so the total amount of gas supplied to the adsorbent 12 throughout the adsorption process can be ensured. And, it is also possible to shift to the second adsorption control with a high adsorption rate at a stage where the adsorption of carbon dioxide to the adsorbent 12 has progressed to some extent and the adsorption rate has decreased, realizing efficient recovery of carbon dioxide.

[0047] Also, the air flow generation device of the present embodiment is the fan 61 disposed on the upstream side of the reactor 11 in the intake line 101.

[0048] Thereby, it is possible to increase the internal pressure of the reactor 11 in the second adsorption control by using the fan 61 for supplying the gas to be adsorbed to the adsorbent 12. Also, in a configuration where a fan is disposed on the downstream side of the reactor 11, even if the fan is driven, the internal pressure of the reactor 11 cannot be increased due to the closed exhaust valve 31, and a separate pipe for sending the blowing by the fan to the upstream side of the reactor 11 must be prepared. In this regard, in the configuration of the present embodiment, since the fan 61 is disposed on the upstream side, a configuration in which the internal pressure of the reactor 11 can be increased by the blowing of the fan 61 can be realized without changing the piping configuration or the like.

[0049] Also, in the present embodiment, when the concentration of carbon dioxide in the gas that has passed through the reactor 11 exceeds the threshold value, the control device 90 shifts from the first adsorption control to the second adsorption control.

[0050] Thereby, it is possible to shift to the second adsorption control with a high adsorption rate at the timing when the adsorbent 12 is in a state close to saturation, and the carbon dioxide adsorption rate throughout the adsorption process can be further improved.

[0051] Further, in the present embodiment, the control device 90 may shift to the second adsorption control after a predetermined time has elapsed since the execution of the first adsorption control.

[0052] Thereby, the control device 90 can determine the timing of shifting from the first adsorption control to the second adsorption control by a timer or the like without monitoring the carbon dioxide concentration at the outlet of the reactor 11, and can realize a configuration for improving the adsorption rate with a simple configuration.

[0053] As described above, an example of the single reactor method of recovering carbon dioxide using one reactor 11 that holds the adsorbent 12 has been described, but the present invention can also be applied to a carbon dioxide recovery device configured to perform an adsorption step and a desorption step in parallel using a plurality of reactors 11.

[0054] Next, referring to FIG. 4, an example of a carbon dioxide recovery device 1a using a plurality of reactors 11a and 11b will be described. FIG. 4 is a schematic diagram for explaining the relationship between the fan 61 and the plurality of reactors 11a and 11b in the carbon dioxide recovery device 1 according to the modified example. In the following description, the same reference numerals are given to the configurations that are common or similar to those in the above embodiment, and detailed descriptions may be omitted.

[0055] FIG. 4 shows a reactor 11a in which the second adsorption control is being executed because the adsorption step is approaching the end, and a reactor 11b in which the first adsorption control is being executed from the beginning to the middle of the adsorption step, among the plurality of reactors 11. In addition, in FIG. 4, illustration of the configuration for recovering carbon dioxide into the carbon dioxide tank 65 and the configuration of the intake valve 21 and the like are omitted.

[0056] The intake line 101a of the carbon dioxide recovery device 1a of the modified example is branched and connected to each of the plurality of reactors 11a and 11b. A fan 61 is disposed on the upstream side of the intake line 101a, and by driving the fan 61, it is possible to generate an air flow that sends air into each of the plurality of reactors 11a and 11b.

[0057] In this modification, an exhaust line 102a is arranged downstream of the reactor 11a, and an exhaust line 102b is arranged downstream of the reactor 11b. An exhaust valve 31a is arranged in the exhaust line 102a, and an exhaust valve 31b is arranged in the exhaust line 102b.

[0058] The control device 90 independently controls the exhaust valve 31a and the exhaust valve 31b, thereby enabling the first adsorption control to be performed to close the exhaust valve 31a corresponding to the reactor 11a nearing the end of the adsorption process, while opening the exhaust valve 31b corresponding to the reactor 11b in the early to middle stages of the adsorption process.

[0059] In the modification described above, a plurality of reactors 11a to 11b are arranged, and the control device 90 can perform the first adsorption control and the second adsorption control for each of the reactors 11a to 11b at different timings.

[0060] This allows the adsorption rate to be improved, and the load on the device to be distributed by performing the adsorption step and the desorption step in parallel in each of the multiple reactors 11a to 11b.

[0061] Although only two reactors 11a and 11b are shown in FIG. 4, the carbon dioxide capture device 1a of a modified example may have three or more reactors 11.

[0062] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. Furthermore, the effects described in the above embodiments are merely preferred effects, and the present invention is not limited to those described in the above embodiments.

[0063] In the above embodiment and modified example, the fan 61 as an airflow generating device is arranged upstream of the reactor 11, but this configuration is not limited to this. A configuration in which the fan is arranged downstream of the reactor and a pump that increases the internal pressure of the reactor is arranged separately as an airflow generating device may also be used. In this case, in the first adsorption control, the downstream fan exerts suction force to supply air to the adsorbent, and in the second adsorption control, the fan for the reactor is stopped while the pump increases the internal pressure of the reactor. In this way, the airflow generating device that generates the airflow in the first adsorption control and the airflow generating device that increases the internal pressure of the reactor by the airflow in the second adsorption control may be configured as separate, independent devices. [Explanation of symbols]

[0064] 1. Carbon dioxide capture device 11, 11a, 11b Reactor 12 Adsorbent 21 Intake valve 31, 31a, 31b Exhaust valve 61 fans 90 Control device 101,101a Intake line 102, 102a, 102b Exhaust line 150 Carbon Dioxide Line

Claims

1. a reactor having an adsorbent therein; an intake line connected to the upstream side of the reactor and through which a gas containing carbon dioxide flows; an exhaust line connected to the downstream side of the reactor and through which the gas passes after passing through the adsorbent; an exhaust opening and closing device disposed in the exhaust line and capable of opening and closing a path of the exhaust line; an airflow generating device that generates an airflow that sends the gas from the intake line to the adsorbent inside the reactor; a control device that executes a first adsorption control in an adsorption step of adsorbing the carbon dioxide into the adsorbent, in which the airflow generating device generates the airflow while the exhaust line path is opened by the exhaust opening and closing device, and a second adsorption control that generates the airflow while the exhaust line path is closed by the exhaust opening and closing device after the first adsorption control is executed, thereby increasing the internal pressure of the reactor; A carbon dioxide capture device comprising:

2. The airflow generating device is a fan disposed upstream of the reactor in the intake line; The carbon dioxide capture device according to claim 1 .

3. The control device When the concentration of the carbon dioxide in the gas that has passed through the reactor exceeds a threshold value, the first adsorption control is switched to the second adsorption control. The carbon dioxide recovery device according to claim 1 or 2.

4. The control device transitioning to the second adsorption control after a predetermined time has elapsed since the first adsorption control was executed; The carbon dioxide recovery device according to claim 1 or 2.

5. A plurality of the reactors are arranged, The control device The first adsorption control and the second adsorption control can be performed at different timings for each of the reactors. The carbon dioxide recovery device according to claim 1 or 2.

Images