Carbon dioxide capture equipment

Abstract

To provide a carbon dioxide recovery device capable of suppressing deterioration of an adsorbent even when the outside air temperature is high.SOLUTION: A carbon dioxide recovery device 1 includes: a reactor 11 which has an adsorbent 12; an intake line 101 which is connected to the upstream side of the reactor 11 and through which gas flows; a fan 61, an intake valve 21, and an exhaust valve 31 which can adjust the flow rate of gas supplied from the intake line 101 to the adsorbent 12; an outside air temperature sensor 52 which acquires the outside air temperature at the location where the reactor 11 is installed; a carbon dioxide sensor 53 which acquires the carbon dioxide concentration in the atmosphere; a humidity sensor 54 which acquires the humidity of the atmosphere; and a flow rate control unit 56 which adjusts, by controlling the fan 61, the intake valve 21, and the exhaust valve 31, the flow rate of gas flowing into the reactor 11 on the basis of the outside air temperature, the carbon dioxide concentration, and the humidity, so that the temperature of the adsorbent during an adsorption process in which the adsorbent 12 adsorbs carbon dioxide does not exceed a preset threshold.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] Conventionally, techniques for recovering carbon dioxide from a gas containing carbon dioxide, such as outside air, 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] In the adsorption process of adsorbing carbon dioxide onto an adsorbent, the temperature of the adsorbent rises due to the heat of adsorption generated when carbon dioxide and water are adsorbed. When the outside air temperature is high, the base temperature of the adsorbent rises, and the temperature of the adsorbent when the heat of adsorption is generated also becomes high (for example, 50°C), making the adsorbent susceptible to oxidation and deterioration.

[0005] An object of the present invention is to provide a carbon dioxide capture device that can suppress deterioration of an adsorbent even when the outside air temperature is high. [Means for solving the problem]

[0006] (1) The present invention relates to a reactor (e.g., reactor 11, reactors 11a to 11c 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 airflow adjusting unit (e.g., fan 61, intake valve 21, and exhaust valve 31 described later) capable of adjusting the flow rate of the gas supplied from the intake line to the adsorbent inside the reactor, an outside air temperature detecting unit (e.g., outside air temperature sensor 52 described later) that acquires the outside air temperature of a location where the reactor is placed, and an atmosphere a carbon dioxide concentration detection unit (for example, a carbon dioxide sensor 53 described later) that acquires the carbon dioxide concentration of the outside air, a humidity detection unit (for example, a humidity sensor 54 described later) that acquires the humidity of the atmosphere, and a flow rate control unit (for example, a flow rate control unit 56 described later) that adjusts the flow rate of the gas flowing into the reactor by controlling the air flow adjustment unit based on the outside air temperature, the carbon dioxide concentration, and the humidity so that the temperature of the adsorbent in the adsorption step of adsorbing the carbon dioxide onto the adsorbent does not exceed a preset threshold value (for example, an oxidation limit temperature described later).

[0007] (2) The carbon dioxide recovery device described in (1) above further includes a temperature calculation unit (e.g., a controller 55 described later) that predicts and calculates the temperature of the adsorbent when the adsorption process is performed based on the outside air temperature, the carbon dioxide concentration, and the humidity, and the flow rate control unit may control the flow rate to a lower value (e.g., a suppressed flow rate described later) than the predetermined flow rate of the gas so that the temperature of the adsorbent falls below the threshold value based on the temperature predicted and calculated by the temperature calculation unit.

[0008] (3) In the carbon dioxide recovery device described in (2) above, the flow control unit may control the flow rate to a value lower than a preset flow rate of the gas (for example, a normal flow rate described below), and then control the flow rate to the preset flow rate.

[0009] (4) In the carbon dioxide recovery device described in any one of (1) to (3) above, the airflow adjustment unit may be a fan (e.g., fan 61 described later) that generates an airflow that sends the gas into the reactor, and the flow rate control unit may control the flow rate of the gas flowing into the reactor by adjusting the airflow rate of the fan.

[0010] (5) In the carbon dioxide recovery device described in any one of (1) to (3) above, the airflow adjustment unit may be an intake valve (e.g., intake valve 21 described later) arranged upstream of the reactor and configured to be able to adjust the flow rate, and an exhaust valve (e.g., exhaust valve 31 described later) arranged downstream of the reactor and configured to be able to adjust the flow rate, and the flow rate control unit may control the flow rate of the gas flowing into the reactor by adjusting the opening of the intake valve and the exhaust valve.

[0011] (6) In the carbon dioxide recovery device described in any one of (1) to (3) above, the reactor (for example, reactors 11a to 11c described later) may be arranged in plurality, and the flow rate control unit may be able to control the flow rate of the gas for each of the reactors at different times. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a carbon dioxide capture device that can suppress deterioration of the adsorbent even when the outside air temperature is high. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic diagram showing the configuration of a carbon dioxide capture device according to an embodiment of the present invention. [Figure 2] 1 is a graph illustrating a temperature rise of an adsorbent due to the generation of heat of adsorption. [Figure 3] 10 is a graph showing the relationship of the temperature of the adsorbent which changes depending on the outside air temperature. [Figure 4] 10 is a graph illustrating flow rate control that reflects the outside air temperature. [Figure 5] FIG. 10 is a schematic diagram showing the configuration of a carbon dioxide capture device according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0015] <Overall structure> Fig. 1 is a schematic diagram showing the configuration of a carbon dioxide capture apparatus 1 according to one embodiment of the present invention. The carbon dioxide capture apparatus 1 is applied to, for example, direct air capture (DAC) technology that captures carbon dioxide from outside air in order to reduce the carbon dioxide concentration in the outside air. The carbon dioxide captured by the carbon dioxide capture apparatus 1 is stored underground or reused as fuel or material.

[0016] As shown in FIG. 1, the carbon dioxide capture device 1 includes an intake line 101, a reactor 11, an exhaust line 102, a fan 61, an adsorbent temperature sensor 51, an outside air temperature sensor 52, a carbon dioxide sensor 53, a humidity sensor 54, a controller 55, and a flow control unit 56.

[0017] The intake line 101 is a pipe arranged on the upstream side of the reactor 11 and is a flow path for sending outside air into the reactor 11.

[0018] The exhaust line 102 is a pipe connected to the downstream side of the reactor 11, and is a flow path for exhausting the gas that has passed through the adsorbent 12 inside the reactor 11 to the outside.

[0019] 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. The reactor 11 alternately performs an adsorption step in which carbon dioxide in a gas such as intake air is adsorbed onto the adsorbent 12, and a desorption step in which the reactor is evacuated and then heated under reduced pressure to desorb the carbon dioxide adsorbed onto the adsorbent 12.

[0020] The reactor 11 of this embodiment includes an intake valve 21 disposed at a connection portion with the intake line 101, and an exhaust valve 31 disposed at a connection portion with the exhaust line 102. The intake valve 21 and the exhaust valve 31 are flow rate adjusting units that can adjust the flow rate of gas that enters the reactor 11 through an intake port and is then exhausted to the outside through an exhaust port, for example, by changing the opening degree (opening area).

[0021] The fan 61 is disposed downstream of the exhaust line 102 relative to the reactor 11. The fan 61 is a flow rate adjusting unit that can adjust the flow rate of gas that enters the reactor 11 through its intake port and is then exhausted to the outside through its exhaust port by changing the air flow rate. When the fan 61 is driven, a gas flow from "intake" to "exhaust" is generated through the exhaust line 102 toward the reactor 11. As a result, gas is introduced from the atmosphere into the reactor 11 through the intake line 101, passes through the adsorbent 12, and is then exhausted to the outside air through the exhaust line 102. The air exhausted through the exhaust line 102 has a higher ratio of nitrogen and oxygen due to the amount of carbon dioxide recovered.

[0022] The adsorbent temperature sensor 51 is an adsorbent temperature detection unit that detects the temperature of the adsorbent 12 inside the reactor 11. Temperature information detected by the adsorbent temperature sensor 51 is output to the controller 55. The adsorbent temperature is used to trigger a transition from one process to another, to detect that the temperature of the adsorbent 12 has reached an abnormal value, and so on.

[0023] The outside air temperature sensor 52 is an outside air temperature detection unit that detects the temperature of the outside air at the location where the reactor 11 performs the adsorption process. The outside air temperature detected by the outside air temperature sensor 52 is output to the controller 55. The outside air temperature is used as a base temperature for predicting the temperature of the adsorbent 12 in the adsorption process.

[0024] The carbon dioxide sensor 53 is a carbon dioxide concentration detection unit that detects the carbon dioxide concentration at the location where the adsorption process is performed in the reactor 11. Information indicating the carbon dioxide concentration detected by the carbon dioxide sensor 53 is output to the controller 55. The carbon dioxide concentration in the atmosphere is used to reflect the heat of adsorption resulting from the adsorption of carbon dioxide to the adsorbent 12 in the adsorption process in the predicted temperature.

[0025] The humidity sensor 54 is a humidity detection unit that detects the humidity at the location where the adsorption step is performed in the reactor 11. Information indicating the humidity detected by the humidity sensor 54 is output to the controller 55. The humidity in the atmosphere is used to reflect the heat of adsorption resulting from water adsorption to the adsorbent 12 in the adsorption step in the predicted temperature.

[0026] The controller 55 and the flow rate control unit 56 perform flow rate control to adjust the flow rate of the gas supplied to the reactor 11 so that the temperature of the adsorbent 12 does not reach a state where it is easily oxidized during the adsorption process. The controller 55 and the flow rate control unit 56 are configured, for example, by a computer having a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), etc. The controller 55 and the flow rate control unit 56 may also be configured using electronic components such as electric circuits, including relays. The controller 55 and the flow rate control unit 56 may each be configured independently, or may be configured as a single unit.

[0027] The flow rate control by the controller 55 and the flow rate control unit 56 reflects environmental conditions such as the outside air temperature, the atmospheric carbon dioxide concentration, and humidity. Here, the relationship between the temperature of the adsorbent 12 and the outside air temperature will be described with reference to FIGS. 2 and 3. FIG. 2 is a graph illustrating the temperature rise of the adsorbent 12 due to the generation of heat of adsorption. The vertical axis of the graph in FIG. 2 represents temperature (°C), and the horizontal axis represents the elapsed time (sec) in the adsorption process. The graph in FIG. 2 shows that immediately after the start of the adsorption process, the temperature of the adsorbent 12 rises significantly due to the heat of adsorption generated when carbon dioxide and water are adsorbed into the adsorbent 12, and then the temperature gradually decreases over time. In this example, the outside air temperature is about 30°C, so even though heat of adsorption is generated, it does not reach 50°C, at which the adsorbent 12 is susceptible to oxidation.

[0028] FIG. 3 is a graph showing the relationship between the temperature of the adsorbent 12 and the ambient temperature. The vertical axis on the left side of the graph in FIG. 3 represents the temperature of the adsorbent 12, the horizontal axis represents the ambient temperature, and the vertical axis on the right side represents the flow rate (L / min) of the gas flowing through the reactor 11. As can be seen from the graph in FIG. 3, when the ambient temperature is 40°C or higher, the temperature of the adsorbent 12 rises to 50°C or higher, exceeding the oxidation suppression temperature range. In this state, the adsorbent 12 is prone to oxidation. To suppress deterioration, it is preferable to lower the temperature of the adsorbent 12 to the oxidation suppression temperature range even when the ambient temperature is 40°C or higher. One possible method for lowering the temperature of the adsorbent 12 to the oxidation suppression temperature range during the adsorption process is to reduce the flow rate and thereby the adsorption amount. Furthermore, since the flow rate is set high when the ambient temperature is 40°C or higher, there is room to reduce the flow rate.

[0029] Flow rate control by the controller 55 and the flow rate control unit 56 will be described with reference to FIG. 4. FIG. 4 is a graph illustrating flow rate control that reflects the outside air temperature. FIG. 4(a) is a graph showing an example of the time change in adsorbent temperature predicted and calculated by the controller 55. FIG. 4(b) is a graph showing an example of the time change in flow rate adjusted by the flow rate control unit 56. The vertical axis of FIG. 4(a) indicates the temperature of the adsorbent 12, and the horizontal axis indicates the time course of the adsorption process. The vertical axis of FIG. 4(b) indicates the flow rate (supply amount) of the gas ventilated inside the reactor 11, and the horizontal axis indicates the time course of the adsorption process.

[0030] 4(a) shows the temperature change of the adsorbent 12 when the adsorption process is carried out at a constant flow rate without flow rate control when the outside air temperature is high. As shown by this dashed line, when the adsorption process is carried out at a constant flow rate without changing the flow rate when the outside air temperature is high, the temperature of the adsorbent 12 may exceed the oxidation limit temperature (50°C), which is the threshold value of the oxidation suppression region, at the beginning of the adsorption process.

[0031] The controller 55 predicts and calculates the temperature of the adsorbent 12 during the adsorption process based on the outside air temperature, carbon dioxide concentration, and humidity. The outside air temperature is a parameter related to the base temperature of the adsorbent 12. The carbon dioxide concentration in the atmosphere affects the amount of carbon dioxide adsorbed by the adsorbent 12 and is a parameter related to the heat of adsorption resulting from carbon dioxide adsorption. The humidity in the atmosphere affects the amount of water adsorbed by the adsorbent 12 and is a parameter related to the heat of adsorption resulting from water adsorption.

[0032] The temperature prediction of the adsorbent 12 by the controller 55 can be calculated, for example, using a calculation formula, a table, or a learning model constructed by machine learning that is calculated theoretically or empirically based on learning data or an experimental model based on the past operational performance of the carbon dioxide capture device 1. The controller 55 outputs the calculated and predicted temperature to the flow rate control unit 56 as a required value for flow rate control.

[0033] The flow rate control unit 56 performs flow rate control to adjust the flow rate of the gas flowing inside the reactor 11 in the adsorption step based on the predicted temperature (required value) of the adsorbent 12 input from the controller 55. As shown by the solid line in the graph of Fig. 4(a), the flow rate control unit 56 adjusts the flow rate of the gas passing through the reactor 11 so that the temperature of the adsorbent 12 does not exceed the oxidation limit temperature (50°C).

[0034] 4(b), a normal value is set in the flow rate control unit 56 as a flow rate to be applied when the temperature of the adsorbent 12 does not exceed the oxidation limit temperature even when heat of adsorption is generated in a room temperature environment. When the temperature of the adsorbent 12 does not exceed the oxidation limit temperature, the adsorption process is performed at a constant flow rate (normal value).

[0035] If the controller 55 predicts that the temperature of the adsorbent 12 will exceed the oxidation limit temperature, the flow rate control unit 56 controls the flow rate so that the temperature does not exceed the oxidation limit temperature. In the example of Fig. 4(b), the flow rate control unit 56 controls the flow rate to a suppressed flow rate that is lower than the normal value at the beginning of the adsorption process when the temperature of the adsorbent 12 becomes high. This causes the temperature of the adsorbent 12 to behave in a manner that is lower than the oxidation limit temperature, as shown by the solid line in the graph of Fig. 4(a).

[0036] The flow rate control unit 56 controls the flow rate, which has been reduced below the normal value, to return to the normal value after a certain period of time has elapsed. The suppressed flow rate and return time can be calculated, for example, using a formula, a table, or a learning model constructed by machine learning that is calculated theoretically or empirically based on learning data or an experimental model based on the past operational performance of the carbon dioxide capture device 1. The return time is information that determines the slope at which the suppressed flow rate returns to the normal value. The suppressed flow rate and return time may be set by reflecting the effects of the outside air temperature, carbon dioxide concentration, and humidity on a preset reference flow rate and return time.

[0037] The flow rate control unit 56 of this embodiment adjusts the flow rate by changing the air flow rate of the fan 61 in accordance with the set flow rate. The flow rate control unit 56 may adjust the flow rate by changing the openings of the intake valve 21 and the exhaust valve 31 as well as the fan 61. In this case, the flow rate control unit 56 may adjust the flow rate by adjusting the openings of the intake valve 21 and the exhaust valve 31 while keeping the flow rate of the fan 61 constant. Once the adsorption step is completed, a desorption step is carried out, and the carbon dioxide adsorbed in the adsorbent 12 is recovered.

[0038] As described above, the carbon dioxide capture device 1 of this embodiment includes the reactor 11 having the adsorbent 12 therein, the intake line 101 connected upstream of the reactor 11 and through which a gas containing carbon dioxide flows, a fan 61, an intake valve 21, and an exhaust valve (airflow adjustment unit) 31 that can adjust the flow rate of the gas supplied from the intake line 101 to the adsorbent 12 inside the reactor 11, an outside air temperature sensor (outside air temperature detection unit) 52 that acquires the outside air temperature of the location where the reactor 11 is placed, a carbon dioxide sensor (carbon dioxide concentration detection unit) 53 that acquires the carbon dioxide concentration in the atmosphere, a humidity sensor (humidity detection unit) 54 that acquires the humidity of the atmosphere, and a flow rate control unit 56 that adjusts the flow rate of the gas flowing into the reactor 11 based on the outside air temperature, carbon dioxide concentration, and humidity by controlling the fan 61, the intake valve 21, and the exhaust valve 31 so that the temperature of the adsorbent 12 in the adsorption process of adsorbing carbon dioxide onto the adsorbent 12 does not exceed a predetermined oxidation limit temperature (threshold value).

[0039] As a result, in situations where the outside air temperature, atmospheric carbon dioxide concentration, and humidity generate a large amount of heat of adsorption, the flow rate of the gas fed to the adsorbent 12 is suppressed. By suppressing the flow rate, the amounts of carbon dioxide and water fed to the adsorbent 12 are relatively small, so the heat of adsorption generated by the adsorption reaction is also small, and it is possible to avoid a situation in which the temperature of the adsorbent 12 exceeds the oxidation limit temperature during the adsorption process. Furthermore, by reducing the flow rate, the amount of oxygen contained in the gas fed to the adsorbent 12 is also reduced, so oxidation, which causes deterioration of the adsorbent 12, is less likely to occur. The carbon dioxide recovery device 1 of this embodiment can ensure a long life for the adsorbent 12 without adding a complex device configuration.

[0040] In addition, the carbon dioxide recovery device 1 of this embodiment further includes a controller (temperature calculation unit) 55 that predicts and calculates the temperature of the adsorbent 12 when the adsorption process is performed based on the outside air temperature, carbon dioxide concentration, and humidity, and the flow rate control unit 56 controls the flow rate to be less than the gas flow rate that is preset based on the temperature predicted and calculated by the controller 55 so that the temperature of the adsorbent 12 falls below a threshold value.

[0041] This allows the flow rate to be accurately set below the oxidation limit temperature based on the predicted temperature of the adsorbent 12 calculated based on the outside air temperature, carbon dioxide concentration, and humidity, and deterioration of the adsorbent 12 can be more reliably suppressed.

[0042] In this embodiment, the flow rate control unit 56 controls the flow rate to a flow rate (restricted flow rate) that is lower than a preset gas flow rate, and then controls the flow rate to a preset flow rate (normal flow rate).

[0043] As a result, the flow rate is reduced in the early stages of the adsorption process when the temperature of the adsorbent 12 is likely to be high, and the flow rate is increased from the middle stages onwards when the temperature drops over time, thereby increasing the amount of carbon dioxide adsorbed. This makes it possible to minimize the decrease in the carbon dioxide recovery rate caused by reducing the flow rate while suppressing deterioration of the adsorbent 12.

[0044] In addition, in this embodiment, the airflow adjustment unit is a fan 61 that generates an airflow that sends gas into the inside of the reactor 11, and the flow rate control unit 56 controls the flow rate of the gas flowing into the reactor 11 by adjusting the airflow rate of the fan 61.

[0045] This makes it possible to control the flow rate so that the temperature of the adsorbent 12 does not exceed the oxidation limit temperature during the adsorption process even in an environment with a high outside air temperature by adjusting the rotation speed of the fan 61 that generates an airflow to send gas to the adsorbent 12 in the reactor 11.

[0046] In addition, in this embodiment, the airflow adjustment unit has an intake valve 21 that is arranged upstream of the reactor 11 and configured to be able to adjust the flow rate, and an exhaust valve 31 that is arranged downstream of the reactor 11 and configured to be able to adjust the flow rate, and the flow rate control unit 56 may control the flow rate of the gas flowing into the reactor 11 by adjusting the opening degree of the intake valve 21 and the exhaust valve 31.

[0047] As a result, by adjusting the opening area of ​​the inlet and outlet of the reactor 11 by changing the opening of the intake valve 21 and the exhaust valve 31, it is possible to achieve flow control that prevents the temperature of the adsorbent 12 from exceeding the oxidation limit temperature during the adsorption process even in an environment with a high outside air temperature.

[0048] The above describes an example of a single reactor system in which carbon dioxide is captured using one reactor 11 holding an adsorbent 12, but the present invention can also be applied to a carbon dioxide capture device configured to perform the adsorption process and desorption process in parallel using multiple reactors 11.

[0049] Next, an example of a carbon dioxide capture apparatus 1a using a plurality of reactors 11a, 11b, and 11c will be described with reference to Fig. 5. Fig. 5 is a schematic diagram showing the configuration of a carbon dioxide capture apparatus 1a according to a modified example. In the following description, components that are common or similar to those in the above embodiment will be assigned the same reference numerals, and detailed description thereof may be omitted.

[0050] An intake line 101a of the carbon dioxide capture device 1a of the modified example is branched and connected to each of the multiple reactors 11a, 11b, and 11c. An exhaust line 102a is branched and connected to each of the downstream sides of reactor 11a, reactor 11b, and reactor 11c. A fan 61 is disposed at the junction of the branched parts of exhaust line 102a, and driving fan 61 can generate an airflow that sends outside air to each of the multiple reactors 11a, 11b, and 11c.

[0051] The intake valve 21 and the exhaust valve 31 arranged in each of the multiple reactors 11a, 11b, and 11c can be controlled independently for each reactor 11. This allows different processes to be performed in parallel, such as performing an adsorption process in the reactor 11a and the reactor 11c, while performing a desorption process in the reactor 11c, and controlling the flow rate so that the oxidation limit temperature is not exceeded.

[0052] As described above, in the modified example, a plurality of reactors 11a to 11c are arranged, and the flow rate control unit 56 can control the flow rate of gas for each of the reactors 11a to 11c at different timings.

[0053] This allows the temperature of the adsorbent 12 to be controlled to be lower than the oxidation limit temperature in the adsorption step, and the adsorption step and desorption step to be performed in parallel in each of the multiple reactors 11a to 11c, thereby distributing the load on the device.

[0054] Although only three reactors, ie, reactor 11a, reactor 11b, and reactor 11c, are shown in FIG. 5, the carbon dioxide capture device 1a of a modified example may have three or more reactors 11.

[0055] 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.

[0056] For example, the controller 55 may be configured to have an alarm light for notifying an operator that the temperature of the adsorbent 12 is predicted to exceed the oxidation limit temperature during the adsorption process.

[0057] The controller 55 may also use the temperature of the adsorbent 12 detected by the adsorbent temperature sensor 51 in the temperature prediction. [Explanation of symbols]

[0058] 1. Carbon dioxide capture device 11, 11a, 11b Reactor 12 Adsorbent 21 Intake valve 31 Exhaust valve 52 Outside air temperature sensor 53 Carbon dioxide sensor 54 Humidity Sensor 55 Controller 56 Flow control section 61 fans 101,101a Intake line 102,102a Exhaust 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 airflow adjusting unit capable of adjusting the flow rate of the gas supplied from the intake line to the adsorbent inside the reactor; an outside air temperature detection unit that acquires the outside air temperature of a location where the reactor is installed; a carbon dioxide concentration detection unit for acquiring the carbon dioxide concentration of the atmosphere; a humidity detection unit that acquires atmospheric humidity; a flow rate control unit that adjusts the flow rate of the gas flowing into the reactor based on the outside air temperature, the carbon dioxide concentration, and the humidity by controlling the airflow adjustment unit so that the temperature of the adsorbent in the adsorption step of adsorbing the carbon dioxide onto the adsorbent does not exceed a preset threshold value; A carbon dioxide capture device comprising:

2. a temperature calculation unit that predicts and calculates a temperature of the adsorbent when the adsorption step is performed based on the outside air temperature, the carbon dioxide concentration, and the humidity; The flow rate control unit controlling the flow rate of the gas to a value less than a preset flow rate so that the temperature of the adsorbent falls below the threshold value based on the temperature predicted and calculated by the temperature calculation unit; The carbon dioxide capture device according to claim 1 .

3. The flow rate control unit After controlling the flow rate of the gas to a value lower than a preset flow rate, the flow rate is controlled to the preset flow rate. The carbon dioxide capture device according to claim 2 .

4. The airflow adjustment unit is a fan that generates an airflow that sends the gas into the reactor; The flow rate control unit controls the flow rate of the gas flowing into the reactor by adjusting the air flow rate of the fan. The carbon dioxide recovery device according to any one of claims 1 to 3.

5. The airflow adjustment unit is an intake valve arranged upstream of the reactor and configured to be able to adjust the flow rate; an exhaust valve disposed downstream of the reactor and configured to be able to adjust the flow rate; and The flow rate control unit controls the flow rate of the gas flowing into the reactor by adjusting the opening degrees of the intake valve and the exhaust valve. The carbon dioxide recovery device according to any one of claims 1 to 3.

6. A plurality of the reactors are arranged, The flow rate control unit can control the flow rate of the gas for each of the reactors at different timings. The carbon dioxide recovery device according to any one of claims 1 to 3.

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