Carbon dioxide capture device

Abstract

Provided is a carbon dioxide recovery device that can save energy by efficiently driving an air blower during carbon dioxide recovery.　The present invention comprises: a main body 10 having a flow path 11 in which air containing carbon dioxide flows; an air blower 20 that introduces air to the flow path 11; an adsorption unit 30 that is disposed in the flow path 11 and adsorbs carbon dioxide contained in gas introduced to the flow path 11; a drive force adjustment unit which is provided to the air blower 20 and adjusts the flow rate of air introduced to the flow path 11; and a control unit 40 that adjusts the flow rate of gas introduced to the flow path 11 by means of the drive force adjustment unit on the basis of a change in adsorption rate capability VQ, i.e., the amount of carbon dioxide which can be adsorbed per unit time, which changes in accordance with the amount of carbon dioxide adsorbed in the adsorption unit.

Description

[Technical Field]

[0001] This invention relates to a carbon dioxide recovery device for recovering carbon dioxide from a gas containing carbon dioxide. [Background technology]

[0002] Conventional carbon dioxide recovery devices are known to include a main body having a flow passage through which a gas containing carbon dioxide flows, a blower for introducing the gas into the flow passage, and an adsorption unit positioned in the flow passage for adsorbing carbon dioxide contained in the gas flowing through the passage. Carbon dioxide is recovered from the gas by adsorbing the carbon dioxide contained in the gas introduced into the flow passage by the blower onto the adsorption unit (see, for example, Patent Document 1).

[0003] Conventional carbon dioxide recovery devices work by bringing a gas introduced into a flow path into contact with an adsorption section, which is constructed by supporting an adsorbent material such as an amine on a substrate, thereby adsorbing the carbon dioxide contained in the gas onto the adsorption section. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] U.S. Patent Application Publication No. 2017 / 0106330 [Overview of the project] [Problems that the invention aims to solve]

[0005] Conventional carbon dioxide capture systems use a blower to introduce a constant flow rate of gas into the flow path. As a result, the blower cannot be operated efficiently throughout the entire process, from the start to the stop of carbon dioxide adsorption in the adsorption section, and therefore energy savings cannot be achieved.

[0006] The objective of this invention is to provide a carbon dioxide capture device that can conserve energy by efficiently driving a blower during carbon dioxide capture. This will ultimately contribute to mitigating or reducing the impact of climate change. [Means for solving the problem]

[0007] The carbon dioxide recovery device according to the present invention comprises a main body having a flow passage through which a gas containing carbon dioxide flows, a blowing unit for introducing the gas into the flow passage, an adsorption unit arranged in the flow passage for adsorbing carbon dioxide contained in the gas introduced into the flow passage, a flow rate adjustment unit for adjusting the flow rate of the gas introduced into the flow passage, and a control unit that adjusts the flow rate of the gas introduced into the flow passage by the flow rate adjustment unit based on a change in adsorption rate capacity, which is the amount of carbon dioxide that can be adsorbed per unit time, depending on the amount of carbon dioxide adsorbed by the adsorption unit.

[0008] Furthermore, the carbon dioxide recovery device according to the present invention has an adsorbent in the adsorption unit whose adsorption rate capacity decreases as the amount of carbon dioxide adsorbed increases, and the control unit reduces the flow rate of the gas introduced into the flow passage by the flow rate adjustment unit in accordance with the decrease in the adsorption rate capacity.

[0009] Furthermore, in the carbon dioxide recovery device according to the present invention, the flow rate adjustment unit is a blower that constitutes the blowing unit, and the flow rate of the gas introduced into the flow passage is adjusted by adjusting the driving force.

[0010] Furthermore, in the carbon dioxide recovery device according to the present invention, the blowing unit consists of multiple blowers, and the flow rate adjustment unit adjusts the number of blowers being driven among the multiple blowers.

[0011] Furthermore, the carbon dioxide recovery device according to the present invention comprises a plurality of adsorption modules, each having the main body and the adsorption unit, and each of the flow passages arranged in parallel with each other; the air blowing unit is maintained at a predetermined airflow rate and introduces gas into the flow passages of each of the plurality of adsorption modules; and the flow rate adjustment unit is provided in each of the plurality of adsorption modules and is a flow rate adjustment damper capable of adjusting the flow rate of gas introduced into the flow passage.

[0012] Furthermore, in the carbon dioxide recovery device according to the present invention, the control unit causes the adsorption unit to adsorb carbon dioxide within a predetermined range, excluding the minimum and maximum values ​​of the amount of carbon dioxide that the adsorption unit can adsorb.

[0013] Furthermore, in the carbon dioxide recovery apparatus according to the present invention, the control unit acquires the adsorption rate capability from the amount of carbon dioxide adsorbed, based on a numerical table representing the adsorption rate capability for the amount of carbon dioxide adsorbed in the adsorption unit. [Effects of the Invention]

[0014] According to the present invention, by setting the gas flow rate to the optimal level for carbon dioxide adsorption in the adsorption section, where the adsorption rate capacity changes depending on the amount of carbon dioxide adsorbed, the air blower can be driven efficiently, thereby enabling energy savings. [Brief explanation of the drawing]

[0015] [Figure 1] Figure 1 is a schematic diagram of a carbon dioxide recovery device according to a first embodiment of the present invention. [Figure 2] Figure 2 shows a first embodiment of the present invention, where Figure 2(a) is a graph showing the relationship between the passage of time and the amount of carbon dioxide adsorbed by the adsorbent, Figure 2(b) is a graph showing the relationship between the passage of time and the adsorption rate of carbon dioxide by the adsorbent, and Figure 2(c) is a graph showing the relationship between the amount of carbon dioxide adsorbed by the adsorbent and the adsorption rate. [Figure 3]Figure 3 shows a first embodiment of the present invention, where Figure 3(a) is a graph showing the relationship between the time course and the amount of carbon dioxide adsorbed by the adsorbent at multiple different airflow rates, and Figure 3(b) is a graph showing the relationship between the time course and the carbon dioxide adsorption rate of the adsorbent at multiple different airflow rates. [Figure 4] Figure 4 is a graph showing the relationship between air velocity and pressure loss according to the first embodiment of the present invention. [Figure 5] Figure 5 shows a first embodiment of the present invention, where Figure 5(a) is a graph showing the relationship between the amount of carbon dioxide adsorbed by the adsorbent and the airflow velocity, and Figure 5(b) is a graph showing the relationship between the airflow velocity and the driving force of the blower. [Figure 6] Figure 6 is a flowchart of the airflow rate adjustment process according to the first embodiment of the present invention. [Figure 7] Figure 7 is a schematic diagram of a carbon dioxide recovery device according to a second embodiment of the present invention. [Figure 8] Figure 8 is a flowchart of the airflow rate adjustment process according to the second embodiment of the present invention. [Figure 9] Figure 9 is a schematic diagram of a carbon dioxide recovery device showing a state in which some of the blowers according to the second embodiment of the present invention are stopped. [Figure 10] Figure 10 is a schematic diagram of a carbon dioxide recovery device according to a third embodiment of the present invention. [Figure 11] Figure 11 is a graph showing the relationship between the amount of carbon dioxide adsorbed and the adsorption rate of each adsorption module according to the third embodiment of the present invention. [Figure 12] Figure 12 is a diagram illustrating the operation of each adsorption module according to the third embodiment of the present invention. [Figure 13] Figure 13 is a graph showing the relationship between the driving force of a blower according to the fourth embodiment of the present invention and the carbon dioxide concentration of the air discharged from the flow passage, the relationship between the driving force of the blower over time, and the relationship between the carbon dioxide concentration of the air discharged from the flow passage over time. [Figure 14]Figure 14 is a graph showing the relationship between the driving force of a blower and the carbon dioxide concentration of the air discharged from the air passage when adjusting the driving force of the blower according to the fourth embodiment of the present invention. [Figure 15] Figure 15 is a graph showing the relationship between the time course and the amount of carbon dioxide adsorbed when the temperature of the air introduced into the flow path changes according to another embodiment. [Figure 16] Figure 16 shows another embodiment; Figure 16(a) is a graph showing the relationship between elapsed time and the amount of carbon dioxide adsorbed when the adsorbent deteriorates, and Figure 16(b) is a graph showing the relationship between elapsed time and the amount of carbon dioxide adsorbed when the upper limit of the working capacity is reduced. [Figure 17] Figure 17 is a perspective view of a heat exchanger for heating an adsorbent material according to another embodiment. [Figure 18] Figure 18 shows another embodiment; Figure 18(a) is a graph showing the relationship between elapsed time and the amount of carbon dioxide adsorbed when the upper and lower limits of the working capacity are displaced in a direction approaching the equilibrium adsorption amount, and Figure 18(b) is a graph showing the relationship between elapsed time and the amount of carbon dioxide adsorbed when the upper and lower limits of the working capacity are displaced in a direction away from the equilibrium adsorption amount. [Modes for carrying out the invention]

[0016] <First Embodiment> Figures 1 to 6 show one embodiment of the present invention. Figure 1 is a schematic diagram of a carbon dioxide capture device, Figure 2(a) is a graph showing the relationship between the passage of time and the amount of carbon dioxide adsorbed by the adsorbent, Figure 2(b) is a graph showing the relationship between the passage of time and the carbon dioxide adsorption rate of the adsorbent, Figure 2(c) is a graph showing the relationship between the amount of carbon dioxide adsorbed by the adsorbent and the adsorption rate, Figure 3(a) is a graph showing the relationship between the passage of time and the amount of carbon dioxide adsorbed by the adsorbent at several different airflow rates, Figure 3(b) is a graph showing the relationship between the passage of time and the carbon dioxide adsorption rate of the adsorbent at several different airflow rates, Figure 4 is a graph showing the relationship between air velocity and pressure loss, Figure 5(a) is a graph showing the relationship between the amount of carbon dioxide adsorbed by the adsorbent and air velocity, Figure 5(b) is a graph showing the relationship between air velocity and the driving force of the blower, and Figure 6 is a flowchart of the airflow rate adjustment process.

[0017] The carbon dioxide capture device 1 of this embodiment is applied, for example, to direct air capture (DAC) technology, which captures carbon dioxide from the atmosphere in order to reduce the concentration of carbon dioxide in the atmosphere. The carbon dioxide captured by the carbon dioxide capture device 1 can be stored underground or reused as fuel or material.

[0018] As shown in Figure 1, the carbon dioxide recovery device 1 comprises a main body 10 having a flow passage 11 through which air flows, a blower 20 which serves as a blower and flow rate adjustment unit for introducing air into the flow passage 11, an adsorption unit 30 positioned in the flow passage 11 for adsorbing carbon dioxide contained in the air introduced into the flow passage 11, and a control unit 40 for adjusting the flow rate of air introduced into the flow passage 11 by controlling the driving force K of the blower 20.

[0019] The main body 10 consists of a box-shaped member with a flow passage 11 extending linearly inside. The main body 10 has an air inlet 11a for introducing air into the flow passage 11 and an air outlet 11b for discharging the air introduced into the flow passage 11. An inlet-side opening / closing damper 12 for opening and closing the air inlet 11a is provided on the edge of the air inlet 11a of the main body 10. In addition, an outlet-side opening / closing damper 13 for opening and closing the air outlet 11b is provided on the edge of the air outlet 11b of the main body 10.

[0020] The blower 20 is, for example, an axial flow blower driven by an electric motor, and is positioned downstream of the airflow direction of the flow passage 11. The blower 20 has a drive force adjustment unit, such as an inverter, which can change the drive force K of the electric motor, and the airflow rate can be adjusted by adjusting the drive force K.

[0021] The adsorption section 30 is constructed by supporting, for example, an amine-based adsorbent on a plate-shaped substrate that is permeable to air. The adsorption section 30 has a larger air contact area than the cross-sectional area of ​​the flow passage 11 by arranging a plurality of plate-shaped substrates at an angle to the direction of air flow. The adsorption section 30 is provided with a heater (not shown) for heating the adsorbent when desorbing the adsorbed carbon dioxide.

[0022] The control unit 40 includes a CPU, ROM, RAM, etc. When the control unit 40 receives an input signal from a device connected to the input side, the CPU reads a program stored in the ROM based on the input signal, stores the state detected by the input signal in the RAM, and transmits an output signal to a device connected to the output side.

[0023] As shown in Figure 1, the input side of the control unit 40 is connected to a flow sensor 41 for detecting the flow rate of air introduced into the flow passage 11, an introduction-side carbon dioxide concentration sensor 42 for detecting the concentration of carbon dioxide contained in the air introduced into the flow passage 11, and an exhaust-side carbon dioxide concentration sensor 43 for detecting the concentration of carbon dioxide contained in the air discharged from the flow passage 11. The output side of the control unit 40 is connected to a blower 20.

[0024] The carbon dioxide recovery device 1, configured as described above, alternately switches between a recovery mode, in which carbon dioxide contained in the air is adsorbed onto the adsorption unit 30 and recovered, and a desorption mode, in which carbon dioxide adsorbed onto the adsorption unit 30 is desorbed.

[0025] When the carbon dioxide recovery device 1 is operating in recovery mode, the blower 20 is driven with the inlet-side damper 12 opening the air inlet 11a of the flow passage 11 and the discharge-side damper 13 opening the air outlet 11b of the flow passage 11.

[0026] As a result, air is introduced into the flow passage 11 of the main body 10 from the air inlet 11a, and the air after carbon dioxide has been adsorbed in the adsorption section 30 is discharged from the air outlet 11b.

[0027] Furthermore, when the carbon dioxide recovery device 1 is operating in desorption mode, the blower 20 is stopped with the inlet-side damper 12 closing the air inlet 11a of the flow passage 11 and the outlet-side damper 13 closing the air outlet 11b of the flow passage 11. In addition, in desorption mode, the adsorption unit 30 is heated by a heater (not shown) and the flow passage 11 is evacuated by a vacuum pump (not shown) to desorb the carbon dioxide adsorbed on the adsorption unit 30.

[0028] In the recovery mode of the carbon dioxide recovery device 1, the airflow of the blower 20 is adjusted according to the amount of carbon dioxide adsorbed by the adsorption section 30. The relationship between the amount of carbon dioxide adsorbed by the adsorbent material in the adsorption section 30 and the airflow of the blower 20 is explained below.

[0029] An air flow rate F of sufficient magnitude Air_excess When carbon dioxide is adsorbed on the adsorbent constituting the adsorption section 30 at (mol / kg / s), the adsorption amount Q (mol / kg) of carbon dioxide in the adsorbent changes from the state where Q is 0 to the equilibrium adsorption amount Q which is the maximum adsorption amount * (mol / kg) (in the figure, the equilibrium adsorption amount Q * is described as 1 (mol / kg)), when carbon dioxide is adsorbed on the adsorbent up to the vicinity of Q, the relationship between the elapsed time t and the adsorption amount Q of carbon dioxide becomes as shown in Fig. 2(a). Also, the relationship between the elapsed time t and the adsorption rate V Q (mol / kg / s), which is the adsorption amount of carbon dioxide per unit time (also referred to as the adsorption rate capacity), becomes as shown in Fig. 2(b). Therefore, the relationship between the adsorption amount Q and the adsorption rate V Q of the adsorbent is such that as the adsorption amount Q increases, the adsorption rate V Q decreases, as shown in Fig. 2(c).

[0030] Further, the carbon dioxide recovery device 1 starts the recovery mode, for example, from an adsorption amount Q that is 0.2 times the equilibrium adsorption amount Q * of the adsorbent, and ends the recovery mode at an adsorption amount Q that is 0.8 times the equilibrium adsorption amount Q[[ID=2)]] L of the adsorbent. Also, the carbon dioxide recovery device 1 starts the desorption mode from an adsorption amount Q that is 0.8 times the equilibrium adsorption amount Q * of the adsorbent, and ends the desorption mode at an adsorption amount Q that is 0.2 times the equilibrium adsorption amount Q H of the adsorbent. At this time, the range of the adsorption amount Q that is 0.2 times or more and 0.8 times or less of the equilibrium adsorption amount Q * of the adsorbent is referred to as the working capacity (WC), and the carbon dioxide recovery device 1 switches between the recovery mode and the desorption mode within the range of the working capacity. Here, the working capacity is the adsorption amount Q that is 0.2 times or more and 0.8 times or less of the equilibrium adsorption amount Q H of the adsorbent * of the adsorbent L of the adsorbent * of the adsorbent L or more and the adsorption amount Q H or less of the adsorbent is referred to as the working capacity (WC), and the carbon dioxide recovery device 1 switches between the recovery mode and the desorption mode within the range of the working capacity. Here, the working capacity is the adsorption amount Q that is 0.2 times or more and 0.8 times or less of the equilibrium adsorption amount Q * of the adsorbent L [[ID=)5]]or more and the adsorption amount Q HThe following range is not limited to the specified range, but is acceptable as long as it is within a predetermined range excluding the minimum and maximum values ​​of carbon dioxide that the adsorbent can adsorb. The working capacity is, for example, the equilibrium adsorption amount Q of the adsorbent. * Adsorption amount Q is 0.1 times that of L Adsorption amount Q is 0.9 times greater than above. H The following range may also be used.

[0031] Also, a sufficiently large airflow F Air_excess When carbon dioxide is adsorbed onto an adsorbent, the amount of carbon dioxide adsorbed at the lower limit of the working capacity Q L The adsorption rate V when this occurs Q As shown in Figure 2(b), this becomes 0.157 (mol / kg / s). Here, the airflow rate adjusted so that the adsorption rate is 0.157 (mol / kg / s) at the start of carbon dioxide adsorption by the adsorbent is the reference airflow rate F. Air_nоrmal It is defined as (mol / kg / s).

[0032] Figure 3(a) is a graph showing the relationship between time t and the amount of carbon dioxide adsorbed Q for each of several different types of airflow rates F. Figure 3(b) shows the relationship between time t and the carbon dioxide adsorption rate V for each of several different types of airflow rates F. Q This graph shows the relationship between the two.

[0033] As shown in Figures 3(a) and 3(b), the airflow rate F is set to the reference airflow rate F Air_nоrmal If the airflow is increased to an excessive amount, the relationship between the elapsed time t and the amount of carbon dioxide adsorbed Q, and the relationship between the elapsed time t and the carbon dioxide adsorption rate V will be determined. Q The relationship is the standard air flow rate F Air_nоrmal This is almost identical to the case described above. That is, when the airflow rate is greater than the standard airflow rate, the amount of carbon dioxide adsorbed Q and the adsorption rate V per unit of time t are determined. Q Since the efficiency does not improve significantly, it can be seen that the operating efficiency of the air circulating fan is low.

[0034] Furthermore, as shown in Figures 3(a) and (b), the airflow rate F of the blower 20 is set to the reference airflow rate F Air_nоrmal If it is made smaller than this, the carbon dioxide adsorption rate V will be lower when the amount of carbon dioxide adsorbed Q is low. Q The standard airflow rate F Air_nоrmal Adsorption rate V Q It becomes lower than that. In other words, when the airflow rate is made smaller than the standard airflow rate, the adsorption rate of carbon dioxide V with respect to the elapsed time t Q Since there are areas where the amount of adsorption is smaller, and the overall adsorption amount is also smaller, it can be seen that the adsorption capacity of the adsorbent is not being fully utilized.

[0035] Furthermore, pressure loss occurs in the circulating air at the adsorption section 30 in the flow passage 11. For this reason, the blower 20 is driven at high speed when the amount of carbon dioxide adsorbed Q in the adsorption section 30 is small (lower limit of working capacity), as shown in the graph of the relationship between air velocity and pressure loss in Figure 4, and at low speed when the amount of carbon dioxide adsorbed Q is large (upper limit of working capacity). As a result, as shown in Figure 5(a), the air velocity in the flow passage 11 decreases as the amount of carbon dioxide adsorbed Q in the adsorption section 30 increases, and as shown in Figure 5(b), the driving force of the blower 20 decreases as the air velocity in the flow passage 11 decreases.

[0036] Based on the relationship between the adsorbent and the airflow rate described above, the control unit 40 performs an airflow rate adjustment process in the recovery mode, controlling the airflow rate of the blower 20 to adjust the airflow rate introduced into the flow passage 11. The operation of the control unit 40 at this time will be explained using the flowchart in Figure 6.

[0037] (Step S1) In step S1, the control unit 40 determines whether the operating mode is recovery mode. If it determines that the mode is recovery mode, it proceeds to step S2. If it does not determine that the mode is recovery mode, it repeats the process in step S1.

[0038] (Step S2) If the operating mode is determined to be recovery mode in step S1, the control unit 40 determines the current amount of carbon dioxide adsorbed in the adsorption unit 30 Σ(ΔQ) ads The value is estimated, and the process moves to step S3.

[0039] Here, the amount of carbon dioxide adsorbed in the adsorption section 30 is Σ(ΔQ). ads ) is the air flow rate F introduced into the flow passage 11, which is detected by the flow sensor 41. Air The carbon dioxide concentration C of the air introduced into the flow passage 11 is detected by the introduction-side carbon dioxide concentration sensor 42. in , and the carbon dioxide concentration C of the air discharged from the flow passage 11 as detected by the exhaust-side carbon dioxide concentration sensor 43 оut It is estimated based on this.

[0040] (Step S3) In step S3, the control unit 40 determines the current amount of carbon dioxide adsorbed, Σ(ΔQ), which was estimated in step S2. ads Based on this, the adsorption rate capacity V Q The result is calculated, and the process moves on to step S4.

[0041] Here, the adsorption rate capacity V Q This is the amount of carbon dioxide adsorbed in the adsorption section 30 Σ(ΔQ ads Adsorption rate capability V for ) Q It is calculated based on a numerical table that represents the values.

[0042] (Step S4) In step S4, the control unit 40 determines the adsorption rate capacity V calculated in step S3. Q Based on this, the airflow rate F introduced into the flow passage 11 Air The decision is made, and the process moves to step S5.

[0043] Here, the airflow rate F introduced into the flow passage 11 Air This is the calculated adsorption rate capacity V Q The carbon dioxide concentration C of the air introduced into the flow passage 11 is detected by the introduction-side carbon dioxide concentration sensor 42. inRelationship (F Air =V Q / C in ) is determined from.

[0044] (Step S5) In step S5, the control unit 40 determines the airflow rate F to be introduced into the flow passage 11, which was determined in step S4. Air Based on this, the driving force K of the blower 20 is set, and the process moves to step S6.

[0045] (Step S6) In step S6, the control unit 40 determines the current amount of carbon dioxide adsorbed Σ(ΔQ) ads ) is the upper limit of working capacity Q H Determine whether the amount is greater than or equal to the above, and the amount of adsorption Σ(ΔQ) ads ) is the upper limit of working capacity Q H If it is determined that the above is true, the process moves to step S7, and the upper limit Q of the working capacity is determined. H If it is not determined that the above conditions apply, the process returns to step S2.

[0046] (Step S7) In step S6, the current amount of carbon dioxide adsorbed is Σ(ΔQ). ads ) is the upper limit of working capacity Q H If it is determined that the above conditions are met, in step S7 the control unit 40 switches the operation mode to the disengagement mode and proceeds to step S8.

[0047] (Step S8) In step S8, the control unit 40 determines whether or not a stop command has been input. If it determines that a stop command has been input, it proceeds to step S9. If it does not determine that a stop command has been input, it returns to step S1.

[0048] (Step S9) If it is determined in step S8 that a stop command has been entered, in step S9 the control unit 40 stops the carbon dioxide recovery device 1 and terminates the air flow rate adjustment process.

[0049] Thus, according to the carbon dioxide recovery device 1 of this embodiment, the device comprises a main body 10 having a flow passage 11 through which air containing carbon dioxide flows, a blower 20 for introducing air into the flow passage 11, an adsorption unit 30 arranged in the flow passage 11 for adsorbing carbon dioxide contained in the gas introduced into the flow passage 11, a driving force adjustment unit provided on the blower 20 for adjusting the flow rate of air introduced into the flow passage 11, and an adsorption rate capacity V which is the amount of carbon dioxide that can be adsorbed per unit time, which changes according to the amount of carbon dioxide adsorbed in the adsorption unit. Q The system includes a control unit 40 that adjusts the flow rate of gas introduced into the flow passage 11 by a driving force adjustment unit based on the changes in the flow rate.

[0050] Furthermore, the adsorption unit 30 increases its adsorption rate capacity V as the amount of carbon dioxide adsorbed Q increases. Q The adsorbent has a reduced adsorption rate capacity V, and the control unit 40 controls the adsorption rate capacity V. Q As the value decreases, the drive force adjustment unit reduces the flow rate of gas introduced into the flow passage 11.

[0051] Furthermore, the method for recovering carbon dioxide contained in the air is to repeatedly alternate between a recovery step of adsorbing carbon dioxide onto an adsorption unit 30 and a desorption step of desorbing the carbon dioxide adsorbed onto the adsorption unit 30 in the recovery step, and in each of the repeatedly performed recovery steps, the driving force of the blower 20 constituting the blower unit is reduced so as time progresses that the flow rate of air to the adsorption unit 30 decreases.

[0052] This allows the adsorption rate capacity V to be determined according to the amount of carbon dioxide adsorbed Q. Q By adjusting the airflow rate to the optimal level for carbon dioxide adsorption to the adsorption section 30, which changes over time, the blower 20 can be driven efficiently, thereby enabling energy savings.

[0053] The flow rate adjustment unit is a blower 20 that constitutes the air blowing unit, and adjusts the flow rate of air introduced into the air passage 11 by adjusting the driving force K.

[0054] This makes it possible to reliably adjust the airflow rate in the flow passage 11.

[0055] Furthermore, the control unit 40 causes the adsorption unit 30 to adsorb carbon dioxide within a predetermined range (working capacity) excluding the minimum and maximum values ​​of the amount of carbon dioxide that the adsorption unit 30 can adsorb Q.

[0056] This allows the maximum adsorption amount Q and adsorption rate capacity V of the adsorption unit 30 to vary depending on environmental conditions. Q Regardless of the circumstances, it becomes possible to stably adsorb carbon dioxide by the adsorption unit 30.

[0057] Furthermore, the control unit 40 controls the adsorption rate capacity V relative to the amount of carbon dioxide adsorbed Q in the adsorption unit 30. Q Based on a numerical table representing the adsorption amount Q, the adsorption rate capacity V Q Obtain it.

[0058] This makes it possible to reduce the amount of computational processing required in the control unit 40, and thus enable the use of an inexpensive control device.

[0059] <Second Embodiment> Figures 7 to 9 show a second embodiment of the present invention. Figure 7 is a schematic diagram of a carbon dioxide recovery device, Figure 8 is a flowchart of the airflow rate adjustment process, and Figure 9 is a schematic diagram of a carbon dioxide recovery device showing some of the blowers stopped. Components similar to those in the above embodiment are denoted by the same reference numerals.

[0060] In this embodiment, the carbon dioxide recovery device 1 is equipped with multiple blowers 20, which serve as a blowing unit and a flow rate adjustment unit, on the downstream side of the airflow passage 11 of the main body 10 in the direction of air flow.

[0061] Furthermore, an exhaust-side carbon dioxide concentration sensor 43 and an exhaust-side opening / closing damper 13 are provided on the downstream side of each of the multiple blowers 20 in the main unit 10.

[0062] In the carbon dioxide capture device 1 configured as described above, the control unit 40 performs an airflow rate adjustment process in the capture mode, which controls the number of operating blowers 20 and the airflow rate of the blowers 20 to adjust the flow rate of air introduced into the flow passage 11. The operation of the control unit 40 at this time will be explained using the flowchart in Figure 8, which will show the differences from the first embodiment.

[0063] (Step S5-1) In step S5-1, the control unit 40 determines the air flow rate F to be introduced into the flow passage 11, which was determined in step S4. Air Based on this, the number of blowers 20 to be operated is determined, and the process proceeds to step S5-2 or step S5-3.

[0064] (Step S5-2) In step S5-2, the control unit 40 sets the driving force K of the blower 20 to be driven, assuming that the number of blowers 20 to be operated is 1, and then proceeds to step S6.

[0065] In this case, if there is only one blower 20 in operation, as shown in Figure 9, the drive of the blower 20 that is to be stopped is stopped, and the discharge-side opening / closing damper 13 corresponding to the blower 20 that is to be stopped is closed.

[0066] (Step S5-3) In step S5-3, if the number of blowers to be operated determined in step S5-1 is multiple, the control unit 40 sets the number of blowers 20 to be driven and the driving force K of each blower 20 to be driven, and then proceeds to step S6.

[0067] Thus, according to the carbon dioxide recovery device 1 of this embodiment, similar to the previous embodiment, the adsorption rate capacity V depends on the amount of carbon dioxide adsorbed Q. Q By circulating air at an optimal flow rate for carbon dioxide adsorption through the flow passage 11 to the adsorption section 30, which changes in temperature, the blower 20 can be driven efficiently, thereby enabling energy savings.

[0068] Furthermore, the air blowing section consists of multiple blowers 20, and the flow rate adjustment section adjusts the number of blowers 20 that are driven among the multiple blowers 20.

[0069] This allows the optimal flow rate of air for carbon dioxide adsorption to be introduced into the flow passage 11 by changing the number of blowers 20 in operation. Therefore, when the required air flow rate is low, the energy consumption for driving the blowers 20 can be further reduced.

[0070] <Third Embodiment> Figures 10 to 12 show a third embodiment of the present invention. Figure 10 is a schematic diagram of a carbon dioxide capture device, Figure 11 is a graph showing the relationship between the amount of carbon dioxide adsorbed and the adsorption rate of each adsorption module, and Figure 12 is a diagram illustrating the operation of each adsorption module. Components similar to those in the above embodiments are denoted by the same reference numerals.

[0071] The carbon dioxide recovery device 1 of this embodiment has a main body 10 and an adsorption unit 30, and is equipped with a plurality of adsorption modules (MOD.1, MOD.2, MOD.3, MOD.4, MOD.5 in Figure 10) in which each flow passage 11 is arranged in parallel with each other.

[0072] Furthermore, the carbon dioxide recovery device 1 is provided with one air outlet 11b for each of the multiple adsorption modules, and an air outlet opening / closing damper 13 is provided on the edge of the air outlet 11b.

[0073] Furthermore, the carbon dioxide capture device 1 is positioned as a blower unit downstream of the flow passage 11 of the multiple adsorption modules, with one blower 20 provided for each of the multiple adsorption modules.

[0074] Between each of the multiple adsorption modules' adsorption sections 30 and the blower 20, there is an opening adjustment damper 14, which serves as a flow rate adjustment unit that opens and closes the flow passage 11 of each of the multiple adsorption modules in a manner that allows for adjustment of the opening degree.

[0075] In each of the multiple adsorption modules of the carbon dioxide recovery device 1 configured as described above, the device is operated while switching between recovery mode and desorption mode.

[0076] Here, for example, if the time required for the recovery mode is four times the time required for the desorption mode, a carbon dioxide recovery device 1 equipped with five adsorption modules is configured as shown in Figure 10. In the carbon dioxide recovery device 1 equipped with five adsorption modules, four adsorption modules (MOD.1, MOD.2, MOD.3, MOD.4 in Figure 10) are operated in recovery mode, and one adsorption module (MOD.5 in Figure 10) is operated in desorption mode.

[0077] Furthermore, the four adsorption modules operating in recovery mode each have an adsorption rate capacity V of the adsorption unit 30 relative to each of the multiple adsorption modules. Q The airflow rate F introduced into the flow passage 11 is determined accordingly. Air The opening degree of each of the opening degree adjustment dampers 14 of the multiple adsorption modules is adjusted accordingly.

[0078] In this process, the four adsorption modules in recovery mode start the recovery mode at different times, resulting in the carbon dioxide adsorption amount Q and adsorption rate capacity V shown in Figure 11. Q As shown in the graph illustrating the relationship, the respective adsorption rate capacities V Q The timing of switching from recovery mode to detachment mode is made different.

[0079] Figure 12 shows the airflow rate F introduced into the flow passage 11 in each adsorption module. Air This shows the change over time. The size of the white arrows for each adsorption module in Figure 12 represents the airflow rate F. Air This shows the size. Here, the adsorption modules operating in desorption mode switch over time in the order of MOD.5, MOD.4, MOD.3, MOD.2, and MOD.1, as shown in Figure 12. At this time, the adsorption modules in recovery mode each have an air flow rate F AirThe parameters are adjusted to be different. This ensures that the total airflow rate supplied to each of the multiple adsorption modules remains constant. In this case, the blower 20 is driven with a constant driving force K.

[0080] Thus, according to the carbon dioxide recovery device 1 of this embodiment, similar to the previous embodiment, the adsorption rate capacity V depends on the amount of carbon dioxide adsorbed Q. Q By circulating air at an optimal flow rate for carbon dioxide adsorption through the flow passage 11 to the adsorption section 30, which changes in temperature, the blower 20 can be driven efficiently, thereby enabling energy savings.

[0081] Furthermore, the device comprises multiple adsorption modules, each having a main body 10 and an adsorption unit 30, with each flow passage 11 arranged in parallel with the others. The air blower maintains a predetermined airflow rate and introduces gas into each of the flow passages 11 of the multiple adsorption modules. The flow rate adjustment unit is provided for each of the multiple adsorption modules and is a flow rate adjustment damper capable of adjusting the flow rate of gas introduced into the flow passage 11.

[0082] This allows the airflow rate to be kept constant across the multiple adsorption modules, while ensuring that the optimal flow rate of air is distributed through the flow passage 11 in each adsorption module. Since there is no need to change the airflow rate, the blower 20 can be operated more efficiently.

[0083] <Fourth Embodiment> Figures 13 and 14 show a fourth embodiment of the present invention. Figure 13 is a graph showing the relationship between the driving force of the blower and the carbon dioxide concentration of the air discharged from the airflow passage, the relationship between the time course and the driving force of the blower, and the relationship between the time course and the carbon dioxide concentration of the air discharged from the airflow passage. Figure 14 is a graph showing the relationship between the driving force of the blower and the carbon dioxide concentration of the air discharged from the airflow passage when adjusting the driving force of the blower. Components similar to those in the above embodiments are denoted by the same reference numerals.

[0084] The carbon dioxide recovery device 1 of the present embodiment has the same configuration as that of the first embodiment (Fig. 1).

[0085] The control unit 40 controls to continue the recovery mode until the amount of carbon dioxide adsorbed Σ(ΔQ ads ) in the adsorption unit 30 reaches the upper limit Q H of the working capacity, and performs feedback control to adjust the driving force K of the blower 20 so that the carbon dioxide concentration C оut of the air discharged from the flow path 11 becomes a predetermined target carbon dioxide concentration C оbj in the vicinity of 0 ppm, such as 80 ppm (ΔC = C оbj - C оut ).

[0086] That is, the control unit 40 detects the carbon dioxide concentration C оut of the air discharged from the flow path 11 by the discharge-side carbon dioxide concentration sensor 43, and adjusts the driving force K of the blower 20 so that the detected carbon dioxide concentration C оut of the air becomes the target carbon dioxide concentration C оbj , thereby adjusting the introduction amount of the air introduced into the flow path 11.

[0087] Here, in a state where the flow rate of the air introduced into the flow path 11 is used as the reference air flow rate, when the time of the recovery mode for adsorbing carbon dioxide by the adsorption unit 30 from the lower limit Q L to the upper limit Q H requires 8000 seconds, the relationship between the driving force of the blower 20 and the target carbon dioxide concentration C оbj is shown in the upper part of Fig. 13. In the upper part of Fig. 13, at the 1000-second time point, since the adsorption rate capacity V Q of the adsorption unit 30 is large, it shows that the driving force K of the blower 20 for which the target carbon dioxide concentration C оbj is large. Also, at the 4500-second time point and the 8000-second time point, as time elapses, the adsorption rate capacity V Q of the adsorption unit 30 becomes small, and it shows that the driving force K of the blower 20 for which the target carbon dioxide concentration C оbj also becomes small.

[0088] At this time, the driving force K of the blower 20 decreases over time as shown in the middle of FIG. 13. Also, the carbon dioxide concentration C of the air discharged from the flow passage 11 оut converges to 80 ppm over time as shown in the lower part of FIG. 13.

[0089] In addition, due to the aging change of the adsorption part 30 such as the decrease in the carbon dioxide adsorption performance of the adsorbent, the carbon dioxide adsorption force of the adsorption part 30 decreases, or the blower 20 undergoes aging change, the driving force K of the blower 20 and the carbon dioxide concentration C of the air discharged from the flow passage 11 оut and the relationship between them may change. With the aging change of the adsorption part 30 and the blower 20, the relationship between the driving force K of the blower 20 and the carbon dioxide concentration C оut changes in the order of curve (a), curve (b), and curve (c) over time as shown in FIG. 14, and the driving force K of the blower 20 required to make the carbon dioxide concentration C оut increases. Thus, even when aging changes occur in the adsorption part 30 and the blower 20, the carbon dioxide concentration C of the air discharged from the flow passage 11 оut is maintained at the target carbon dioxide concentration C by adjusting the driving force K of the blower 20. оbj

[0090] Thus, according to the carbon dioxide recovery device 1 of the present embodiment, a main body part 10 having a flow passage through which a gas containing carbon dioxide flows, a blower 20 for introducing the gas into the flow passage 11, an adsorption part 30 disposed in the flow passage 11 for adsorbing carbon dioxide contained in the air introduced into the flow passage 11, a driving force adjustment part provided in the blower 20 for adjusting the flow rate of the air introduced into the flow passage 11, and the concentration C of carbon dioxide contained in the air discharged from the flow passage 11 оut is detected by an exhaust side carbon dioxide concentration sensor 43, and the concentration C of carbon dioxide contained in the air discharged from the flow passage 11 detected by the exhaust side carbon dioxide concentration sensor 43 оut is the concentration C of a predetermined carbon dioxide оbj ​The system includes a control unit 40 that adjusts the flow rate of gas introduced into the flow passage 11 by the drive force adjustment unit of the blower 20, so as to achieve this.

[0091] As a result, the concentration of carbon dioxide C in the air discharged from the flow passage 11 оut The target carbon dioxide concentration C оbj By maintaining this, it becomes possible to maintain the amount of carbon dioxide adsorbed in the adsorption section 30, and the blower 20 can be driven efficiently in relation to the amount of carbon dioxide adsorbed, thereby enabling energy saving.

[0092] Furthermore, the flow rate adjustment unit is a blower 20, which adjusts the flow rate of air introduced into the flow passage 11 by adjusting the driving force.

[0093] This makes it possible to reliably adjust the airflow rate in the flow passage 11.

[0094] In the fourth embodiment described above, a carbon dioxide recovery device 1 equipped with one blower 20 as the air blowing unit was shown, but it is not limited to this. For example, as shown in Figure 7, it is also applicable to the carbon dioxide recovery device 1 of the second embodiment equipped with multiple blowers 20 as the air blowing unit. In this case, by adjusting the number of blowers 20 that are driven among the multiple blowers 20, the carbon dioxide concentration C of the air discharged from the flow passage 11 can be adjusted. оut However, the target carbon dioxide concentration C оbj The flow rate of air introduced into the flow passage 11 may be adjusted accordingly. By changing the number of blowers 20 in operation, the optimal flow rate of air for carbon dioxide adsorption can be introduced into the flow passage 11, thereby further reducing the energy consumption required to drive the blowers 20 when the required air flow rate is low.

[0095] Furthermore, as shown in Figure 10, when applied to a third embodiment of the carbon dioxide recovery device 1 equipped with multiple adsorption modules, the opening degree of each flow passage 11 of the multiple adsorption modules is adjusted by the opening degree adjustment damper 14, thereby controlling the carbon dioxide concentration C of the air discharged from the flow passage 11. оut However, the target carbon dioxide concentration C оbj The flow rate of air introduced into the flow passage 11 of each adsorption module may be adjusted accordingly.

[0096] <Other Embodiments> In another embodiment, in the carbon dioxide recovery device shown in Figure 1, the driving force K of the blower 20 is controlled based on the flow rate of air introduced into the flow passage 11 detected by the flow sensor 41.

[0097] This makes it possible to adjust the airflow rate introduced into the air passage when the carbon dioxide capture device is installed outdoors and is affected by outdoor wind.

[0098] Furthermore, the carbon dioxide recovery device is equipped with numerical tables that show the relationship between relative humidity and the amount of moisture adsorbed, and the relationship between temperature and the amount of moisture adsorbed, for the adsorbent material in the adsorption section. In desorption mode, the heat required to desorb the carbon dioxide adsorbed by the adsorption section and the heat required to desorb the moisture adsorbed by the adsorption section are added to the heat absorption section. For example, by supplying low-pressure superheated steam at 5 kPa and 81°C (relative humidity 10%) to the heat absorption section, carbon dioxide and moisture are desorbed from the heat absorption section.

[0099] This makes it possible to reliably remove carbon dioxide and moisture from the heat absorption section when the carbon dioxide capture device is installed outdoors and is affected by the humidity of the outdoor air.

[0100] Furthermore, when the outdoor temperature where the carbon dioxide capture device is installed is high, and the temperature of the air introduced into the flow passage 11 is higher than the reference temperature, as shown in Figure 15, the equilibrium adsorption amount of carbon dioxide in the adsorption section in capture mode decreases, and the upper limit of the working capacity QH The time required to reach the desired state may be longer. On the other hand, the amount of heat required to heat the heat absorption section in the release mode becomes smaller. In such cases, it is possible to maintain the working capacity range by extending the operating time in the recovery mode and extending the operating time of the blower. This makes it possible to suppress the decrease in the amount of carbon dioxide adsorbed in the recovery mode.

[0101] Furthermore, when the outdoor temperature where the carbon dioxide capture device is installed is low, and the temperature of the air introduced into the flow passage 11 is lower than the reference temperature, as shown in Figure 15, the equilibrium adsorption amount of carbon dioxide in the adsorption section in capture mode increases, and the upper limit of the working capacity Q H The time required to reach the desired state may be shortened. On the other hand, the amount of heat required to heat the heat absorption section in the release mode increases. In such cases, it is possible to maintain the working capacity range by shortening the operating time in the recovery mode and shortening the operating time of the blower. This makes it possible to suppress the decrease in the amount of carbon dioxide adsorbed in the recovery mode.

[0102] Furthermore, in carbon dioxide capture devices, the equilibrium adsorption amount Q of carbon dioxide deteriorates over time due to the aging of the adsorbent material in the adsorption section. * As Q decreases, the upper limit of the working capacity in recovery mode is reached, as shown in Figure 16(a). H Time T to reach ads_d The reference time T ads This becomes longer. In this case, the carbon capture system will require more energy to drive the blower, and the total amount of carbon dioxide captured will decrease. Therefore, the carbon capture system will have a working capacity limit Q H The adsorption unit is deemed to have reached the end of its lifespan if the time required to reach the end of its lifespan exceeds a predetermined time. The carbon dioxide recovery system can operate normally by replacing the adsorption unit based on the determination of its lifespan.

[0103] Furthermore, in carbon dioxide capture devices, the equilibrium adsorption amount Q of carbon dioxide deteriorates over time due to the aging of the adsorbent material in the adsorption section.* When Q becomes small, in order to maintain the operating time of the recovery mode, the upper limit of the working capacity Q is set as shown in Figure 16(b). H Upper limit Q H_d The limit may be reduced. In this case, the carbon dioxide recovery device will reduce the upper limit of its working capacity by repeating the recovery mode. Therefore, the carbon dioxide recovery device will determine that the adsorption unit has reached the end of its lifespan when the upper limit of its working capacity falls below a predetermined value. The carbon dioxide recovery device can operate normally by replacing the adsorption unit based on the determination of the adsorption unit's lifespan.

[0104] Furthermore, in order to desorb the carbon dioxide adsorbed on the adsorbent in the adsorption section, the carbon dioxide recovery device may also include a heat exchanger 50, as shown in Figure 17, which consists of a tube 51 through which a refrigerant flows and a plurality of fins 52 provided on the outer surface of the tube 51, placed within the adsorbent. In this case, the adsorbent is held in the gaps between the plurality of fins 52 that make up the heat exchanger 50, making it possible to suppress the uneven distribution of granular adsorbent.

[0105] On the other hand, if steam is supplied directly to the adsorbent in the adsorption section to desorb carbon dioxide adsorbed onto the adsorbent, uneven distribution of the granular adsorbent may occur in the adsorption section. If uneven distribution of the adsorbent occurs in the adsorption section, air will circulate mainly around the areas where the density of the adsorbent has decreased, causing the relationship between the work and rotational speed of the blower to deviate from the normal range. Therefore, the degree of uneven distribution of the adsorbent should be determined based on the relationship between the work and rotational speed of the blower, and if the degree of uneven distribution of the adsorbent exceeds a predetermined range, the adsorbent should be replenished in the adsorption section to eliminate the uneven distribution of the adsorbent.

[0106] Furthermore, the carbon dioxide recovery system may control the airflow rate of the blower based on the difference between the required airflow rate (the necessary airflow rate) and the actual airflow rate introduced into the flow passage, so that the actual airflow rate introduced into the flow passage equals the required airflow rate. The carbon dioxide recovery system determines that a malfunction, such as fouling of the blower, has occurred if the airflow rate of the blower increases due to repeated operation in recovery mode. The carbon dioxide recovery system can then perform maintenance on the blower based on the determination of the blower malfunction, thereby enabling normal operation.

[0107] Furthermore, the carbon dioxide capture device uses the flow rate F of air introduced into the flow path. air , the carbon dioxide concentration of the air introduced into the flow path C in and the carbon dioxide concentration C in the air discharged from the flow path оut Based on this, the instantaneous amount of carbon dioxide adsorbed ΔQ ads By calculating and sequentially integrating these values, the amount of carbon dioxide adsorbed at the adsorption site Σ(ΔQ) is obtained. ads ) calculate this and get Q L The current amount of carbon dioxide adsorbed Q is estimated by adding it to (Q = Σ(ΔQ) ads )+Q L ).

[0108] Since the amount of carbon dioxide adsorbed Q is estimated by sequential integration, integration errors accumulate as the recovery and desorption modes are repeated. Lower limit of working capacity Q L and upper limit Q H However, as shown in Figure 18(a), the equilibrium adsorption amount Q * When the displacement is in a direction approaching Q, the upper limit of the working capacity Q H and equilibrium adsorption amount Q * As the difference between the two decreases, the carbon dioxide adsorption rate decreases, and the operating time T in recovery mode decreases. ads This becomes longer. Also, the lower limit of working capacity Q L and upper limit Q H However, as shown in Figure 18(b), the equilibrium adsorption amount Q * When the displacement is in a direction away from the target, the upper limit of the working capacity QH and equilibrium adsorption amount Q * As the difference between the two increases, the carbon dioxide adsorption rate increases, and the operating time T in recovery mode increases. ads The operating time T in the capture mode of the carbon dioxide capture device is shortened. ads If the amount of carbon dioxide adsorbed in the adsorption unit Q falls outside the predetermined range, carbon dioxide is desorbed until the amount of carbon dioxide adsorbed in the adsorption unit Q approaches 0, and the working capacity lower limit Q L The system may be operated in a reset mode to adsorb carbon dioxide until a certain amount is reached, and then the recovery mode may be performed. The reset mode may be performed after repeating the recovery mode and desorption mode operation a predetermined number of times.

[0109] Furthermore, when adjusting the blower's driving force based on the carbon dioxide concentration of the air discharged from the flow path, the relationship between the blower's driving force and the carbon dioxide concentration of the air discharged from the flow path is nonlinear, resulting in a time lag. For this reason, adjusting the carbon dioxide concentration of the air discharged from the flow path can be done more accurately by applying a multivariable control system that takes into account factors such as the wind speed of the outdoor air, the humidity of the outdoor air, the temperature of the outdoor air, the performance of the adsorbent, the presence or absence of areas where pressure loss in the adsorption section is low, and the fouling of the blower.

[0110] In the first to fourth embodiments described above, a carbon dioxide recovery device 1 for recovering carbon dioxide from the air was shown, but the invention is not limited thereto. The carbon dioxide recovery device of the present invention may be used, for example, to recover carbon dioxide contained in gas discharged from a boiler. [Explanation of symbols]

[0111] 1. Carbon dioxide capture device 10 Main body 11 Distribution path 11a Air inlet 11b Air outlet 14. Opening angle adjustment damper 20 Blower 30 Adsorption part 40 Control Unit 41 Flow Sensor 42. Inlet-side carbon dioxide concentration sensor 43. Emission-side carbon dioxide concentration sensor

Claims

1. A main body having a flow passage through which a gas containing carbon dioxide flows, A blower unit that introduces gas into the aforementioned flow passage, An adsorption unit is arranged in the flow passage and adsorbs carbon dioxide contained in the gas introduced into the flow passage, A flow rate adjustment unit that adjusts the flow rate of the gas introduced into the flow passage, A control unit adjusts the flow rate of the gas introduced into the flow passage by the flow rate adjustment unit based on the change in adsorption rate capacity, which is the amount of carbon dioxide that can be adsorbed per unit time, depending on the amount of carbon dioxide adsorbed in the adsorption unit. The system includes a flow sensor for detecting the flow rate of gas introduced into the flow passage, The control unit, Based on the flow rate detected by the flow sensor, the amount of carbon dioxide adsorbed in the adsorption unit is estimated. Based on the estimated amount of adsorption, the adsorption rate capability is obtained. Based on the acquired adsorption rate capacity, the flow rate of the gas to be introduced into the flow passage is determined. The flow rate adjustment unit is controlled based on the determined flow rate. Carbon dioxide capture device.

2. The adsorption section has an adsorbent whose adsorption rate capacity decreases as the amount of carbon dioxide adsorbed increases. The control unit reduces the flow rate of the gas introduced into the flow passage by the flow rate adjustment unit as the adsorption rate capacity decreases. The carbon dioxide recovery apparatus according to claim 1.

3. The flow rate adjustment unit is a blower that constitutes the blowing unit, and adjusts the flow rate of the gas introduced into the flow passage by adjusting the driving force. The carbon dioxide recovery apparatus according to claim 1.

4. The aforementioned air blowing unit consists of multiple blowers, The flow rate adjustment unit adjusts the number of blowers to be driven among the multiple blowers. The carbon dioxide recovery apparatus according to claim 1.

5. The system comprises a plurality of adsorption modules, each having the main body and the adsorption portion, and each having the flow passages arranged in parallel with each other. The air blowing unit is maintained at a predetermined airflow rate and introduces gas into the flow passages of each of the multiple adsorption modules. The flow rate adjustment unit is provided in each of the multiple adsorption modules and is a flow rate adjustment damper capable of adjusting the flow rate of the gas introduced into the flow passage. The carbon dioxide recovery apparatus according to claim 1.

6. The control unit causes the adsorption unit to adsorb carbon dioxide within a predetermined range, excluding the minimum and maximum values ​​of carbon dioxide that the adsorption unit can adsorb. The carbon dioxide recovery apparatus according to claim 1.

7. The control unit obtains the adsorption rate capability from the amount of carbon dioxide adsorbed, based on a numerical table representing the adsorption rate capability for the amount of carbon dioxide adsorbed in the adsorption unit. The carbon dioxide recovery apparatus according to claim 1.

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