Carbon dioxide supply device

Abstract

To provide a carbon dioxide supply device which can reduce running cost.SOLUTION: A carbon dioxide supply device 10 measures variations of carbon dioxide concentration in a housing due to time elapse through a carbon dioxide sensor 12b that can measure the carbon dioxide concentration in the housing when desorption voltage potential is applied to an electrochemical cell 12a. Desorption learning data representing relation between the time elapse and desorption amounts of the carbon dioxide from the electrochemical cell 12a is generated based on the variations of the carbon dioxide concentration in the housing due to the measured time elapse. Application time of the desorption voltage potential in a desorption mode is configured based on the desorption learning data to be capable of preventing wasteful application of the desorption voltage potential so as to reduce running cost.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a carbon dioxide supply device that supplies carbon dioxide desorbed from an electrochemical cell to a carbon dioxide supply target by alternately performing an adsorption mode of adsorbing carbon dioxide onto the electrochemical cell and a desorption mode of desorbing carbon dioxide from the electrochemical cell. Background Art

[0002] For example, Patent Literature 1 and Patent Literature 2 disclose carbon dioxide recovery devices that recover carbon dioxide from indoor air using an electrochemical device or an aqueous sodium hydroxide solution to reduce the carbon dioxide concentration. Prior Art Literature Patent Literature

[0003] Patent Literature 1 Japanese Unexamined Patent Application Publication No. 2018-144024 Patent Literature 2 Japanese Unexamined Patent Application Publication No. 2022-8288 Summary of Invention Problems to be Solved by the Invention

[0004] Attempts have been made to increase the yield of crops using the carbon dioxide recovery device as described above. In this case, a device that performs carbon dioxide recovery and supply is used to recover carbon dioxide from the atmosphere and supply the recovered carbon dioxide into a vinyl greenhouse. Thereby, increasing the carbon dioxide concentration in the vinyl greenhouse to, for example, about three times the normal concentration makes it possible to increase the yield of crops by up to about 30%.

[0005] However, when recovering and supplying carbon dioxide, if excessive energy is consumed in the device, there is a problem that the running cost for operating the device increases.

[0006] This disclosure is made in view of the above-mentioned points and aims to provide a carbon dioxide supply device that can reduce running costs. [Means for solving the problem]

[0007] To achieve the above objective, a carbon dioxide supply device according to a first aspect of this disclosure has an electrochemical cell (12a) arranged in a housing that adsorbs carbon dioxide by applying an adsorption potential and desorbs the adsorbed carbon dioxide by applying a desorption potential, and supplies carbon dioxide desorbed from the electrochemical cell to a carbon dioxide supply target (16) by alternately performing an adsorption mode in which carbon dioxide is adsorbed onto the electrochemical cell and a desorption mode in which carbon dioxide is desorbed from the electrochemical cell. A carbon dioxide sensor (12b) for measuring the carbon dioxide concentration inside the enclosure, The desorption data measurement unit (S400~S440) applies a desorption potential to an electrochemical cell adsorbing carbon dioxide while the enclosure is sealed, and measures the change in carbon dioxide concentration inside the enclosure over time using a carbon dioxide sensor. The system includes a desorption learning data generation unit (S450) that generates desorption learning data representing the relationship between elapsed time and the amount of carbon dioxide desorbed from the electrochemical cell, based on the change in carbon dioxide concentration inside the housing over time, as measured by the desorption data measurement unit, Detaching learning data Within a range less than or equal to the maximum detachment time The system is configured to set the application time of the desorption potential in desorption mode.

[0008] In the carbon dioxide supply device according to the first embodiment described above, the desorption data measurement unit measures the change in carbon dioxide concentration inside the housing over time when a desorption potential is applied to the electrochemical cell, using a carbon dioxide sensor capable of measuring the carbon dioxide concentration inside the housing. Then, the desorption learning data generation unit generates desorption learning data that represents the relationship between elapsed time and the amount of carbon dioxide desorbed from the electrochemical cell, based on the change in carbon dioxide concentration inside the housing over time measured by the desorption data measurement unit. In this way, desorption learning data that represents the relationship between elapsed time and the amount of carbon dioxide desorbed from the electrochemical cell is generated based on the change in carbon dioxide concentration inside the housing when carbon dioxide is actually desorbed from the electrochemical cell. Within a range less than or equal to the maximum detachment time By setting the application time of the desorption potential in desorption mode, it is possible to prevent the unnecessary application of the desorption potential, such as continuing to apply the desorption potential even when the desorption of carbon dioxide adsorbed on the electrochemical cell has substantially finished, thereby reducing running costs.

[0009] Furthermore, a carbon dioxide supply device according to a second aspect of this disclosure has an electrochemical cell (12a) arranged in a housing that adsorbs carbon dioxide by applying an adsorption potential and desorbs the adsorbed carbon dioxide by applying a desorption potential, and supplies carbon dioxide desorbed from the electrochemical cell to a carbon dioxide supply target (16) by alternately performing an adsorption mode in which carbon dioxide is adsorbed onto the electrochemical cell and a desorption mode in which carbon dioxide is desorbed from the electrochemical cell. A carbon dioxide sensor (12b) for measuring the carbon dioxide concentration inside the enclosure, The adsorption data measurement unit (S500~S540) applies an adsorption potential to an electrochemical cell while the enclosure is sealed and the carbon dioxide concentration inside the enclosure is higher than the carbon dioxide concentration in the atmosphere, and measures the change in carbon dioxide concentration inside the enclosure over time using a carbon dioxide sensor. The system includes an adsorption learning data generation unit (S550) that generates adsorption learning data representing the relationship between elapsed time and the amount of carbon dioxide adsorbed by the electrochemical cell, based on the change in carbon dioxide concentration inside the housing over time, as measured by the adsorption data measurement unit. Adsorption learning data Within a range less than or equal to the maximum adsorption time The system is configured to set the application time of the adsorption potential in adsorption mode.

[0010] In the carbon dioxide supply device according to the second embodiment described above, the adsorption data measurement unit measures the change in carbon dioxide concentration inside the housing over time when an adsorption potential is applied to the electrochemical cell, using a carbon dioxide sensor capable of measuring the concentration of carbon dioxide inside the housing. Then, the adsorption learning data generation unit generates adsorption learning data that represents the relationship between elapsed time and the amount of carbon dioxide adsorbed from the electrochemical cell, based on the change in carbon dioxide concentration inside the housing over time measured by the adsorption data measurement unit. In this way, adsorption learning data that represents the relationship between elapsed time and the amount of carbon dioxide adsorbed by the electrochemical cell is generated based on the change in carbon dioxide concentration inside the housing when carbon dioxide is actually adsorbed by the electrochemical cell. Therefore, this adsorption learning data Within a range less than or equal to the maximum adsorption time By setting the application time of the adsorption potential in adsorption mode, it is possible to prevent the unnecessary application of the adsorption potential, such as continuing to apply the adsorption potential even though carbon dioxide that can be adsorbed by the electrochemical cell has already been adsorbed, thereby reducing running costs.

[0011] The reference numbers in parentheses above are merely examples of correspondences with specific configurations in embodiments described later, in order to facilitate understanding of this disclosure, and are not intended to limit the scope of this disclosure in any way.

[0012] Furthermore, technical features described in each claim of the patent claims, other than those described above, will become clear from the description of the embodiments and the accompanying drawings, which will be discussed later. [Brief explanation of the drawing]

[0013] [Figure 1] It is a configuration diagram schematically showing the configuration of a carbon dioxide supply device according to an embodiment. [Figure 2] It is a flowchart showing carbon dioxide supply processing executed by a control device, including learning mode processing for generating adsorption learning data and desorption learning data. [Figure 3] (a) shows the operating states of respective parts when the carbon dioxide supply device operates in an adsorption mode, and (b) is a diagram showing the operating states of respective parts when the carbon dioxide supply device operates in a desorption mode. [Figure 4] It is a table showing examples of execution conditions and execution timing for learning mode processing. [Figure 5] It is a flowchart showing details of the learning mode processing. [Figure 6] (a) shows the operating states of respective parts when the carbon dioxide supply device operates in a preliminary preparation adsorption mode, (b) shows the operating states of respective parts when the carbon dioxide supply device operates in a learning desorption mode, and (c) is a diagram showing the operating states of respective parts when the carbon dioxide supply device operates in a learning adsorption mode. [Figure 7] It is a flowchart showing details of desorption learning data generation processing. [Figure 8] It is a graph showing an example of a change in carbon dioxide concentration in a recovery container over time, measured using a carbon dioxide sensor in the learning desorption mode. [Figure 9] It is a graph showing an example of desorption learning data that represents the relationship between elapsed time and the amount of carbon dioxide desorbed from an electrochemical cell, generated based on a change in carbon dioxide concentration in the recovery container over time. [Figure 10] It is a flowchart showing details of adsorption learning data generation processing. [Figure 11] It is a graph showing an example of a change in carbon dioxide concentration in a recovery container over time, measured using a carbon dioxide sensor in the learning adsorption mode. [Figure 12]This graph is an example of adsorption learning data created based on changes in carbon dioxide concentration in the collector over elapsed time, which shows the relationship between elapsed time and the amount of carbon dioxide adsorbed to an electrochemical cell. [Figure 13] This is an explanatory diagram for explaining the update of adsorption learning data according to the difference between the preliminary preparation adsorption time and the execution time of the learning adsorption mode. [Figure 14] This is a flowchart showing details of the adsorption mode execution time setting process. [Figure 15] This is a table showing examples of whether adsorption learning data needs to be corrected, selection conditions, and control values for each operation type of the carbon dioxide supply device in the adsorption mode. [Figure 16] This is an explanatory diagram for explaining the correction of adsorption learning data. [Figure 17] This is a flowchart showing details of the desorption mode execution time setting process. [Figure 18] This is a table showing examples of whether desorption learning data needs to be corrected, selection conditions, and control values for each operation type of the carbon dioxide supply device in the desorption mode. [Figure 19] This is an explanatory diagram for explaining the correction of desorption learning data. DETAILED DESCRIPTION OF EMBODIMENTS

[0014] Hereinafter, a carbon dioxide supply device according to an embodiment of the present disclosure will be described in detail with reference to the drawings. Identical or corresponding reference numerals are given to identical or equivalent parts across a plurality of drawings. The carbon dioxide supply device according to the present embodiment recovers carbon dioxide from air containing carbon dioxide, and supplies the recovered carbon dioxide to carbon dioxide supply destinations such as agricultural facilities including plastic greenhouses and carbon dioxide storage tanks. FIG. 1 schematically shows the configuration of the carbon dioxide supply device according to the present embodiment.

[0015] The carbon dioxide supply device 10 shown in Figure 1 includes a first on-off valve 11, a recovery unit 12, a second on-off valve 13, a blower 14, a flow path switching valve 15, a carbon dioxide sensor 16a installed at the carbon dioxide supply destination 16, and a control device 17, among other things.

[0016] The first on-off valve 11 is installed in the flow piping that connects the atmosphere and the inside of the recovery unit 12. The on-off state of the first on-off valve 11 is controlled by the control device 17. When the first on-off valve 11 is opened, air containing carbon dioxide can be introduced into the recovery unit 12 via the flow piping that connects the atmosphere and the inside of the recovery unit 12. On the other hand, when the first on-off valve 11 is closed, the flow piping that connects the atmosphere and the inside of the recovery unit 12 is blocked.

[0017] The second on-off valve 13 is installed in the flow piping that connects the inside of the recovery unit 12 and the blower 14. The open / closed state of the second on-off valve 13 is controlled by the control device 17. When the second on-off valve 13 is open, air can flow from the recovery unit 12 to the blower 14 through the flow piping that connects the inside of the recovery unit 12 and the blower 14. On the other hand, when the second on-off valve 13 is closed, the flow piping that connects the inside of the recovery unit 12 and the blower 14 is blocked. Therefore, when both the first and second on-off valves 11 and 13 are closed, the flow piping that connects the recovery unit 12 to the outside is blocked, and the inside of the recovery unit 12 becomes sealed.

[0018] The recovery unit 12 includes, for example, an electrochemical cell 12a located inside a metal casing. Furthermore, the recovery unit 12 includes a carbon dioxide sensor 12b capable of measuring the carbon dioxide concentration inside the recovery unit 12. The carbon dioxide sensor 12b is positioned to measure the carbon dioxide concentration in the atmosphere after carbon dioxide has been removed by the electrochemical cell 12a, for example, when air containing carbon dioxide flows through the recovery unit 12.

[0019] The electrochemical cell 12a is capable of adsorbing carbon dioxide through an electrochemical reaction, separating it from the atmosphere, and desorbing the adsorbed carbon dioxide. The atmosphere from which carbon dioxide has been separated is released to the outside via the blower 14 and the flow path switching valve 15. The carbon dioxide desorbed from the electrochemical cell 12a is supplied to the carbon dioxide supply destination 16 by the blower 14 as atmosphere containing a large amount of carbon dioxide. The recovery unit 12 has two openings. One opening is an inlet for introducing atmosphere containing carbon dioxide from the outside into the housing of the recovery unit 12. The other opening is an outlet for discharging the atmosphere from which carbon dioxide has been removed, or the atmosphere containing a large amount of carbon dioxide desorbed from the electrochemical cell 12a. The flow path piping equipped with the first on-off valve 11 is connected to the inlet, and the flow path piping equipped with the second on-off valve 13 is connected to the outlet. Note that "inside the recovery unit 12" is synonymous with "inside the housing".

[0020] Multiple electrochemical cells 12a are stacked inside the housing of the recovery unit 12. The stacking direction of the multiple electrochemical cells 12a is perpendicular to the direction of atmospheric flow. Each electrochemical cell 12a is constructed in a plate shape, and its plate surface is arranged to intersect with the cell stacking direction. A predetermined gap is provided between adjacent electrochemical cells 12a. The gap provided between adjacent electrochemical cells 12a serves as a flow path for the atmosphere.

[0021] Each electrochemical cell 12a is constructed by stacking components such as a working electrode current collector layer, a working electrode, a separator, a counter electrode, and a counter electrode current collector layer in the order described. The working electrode is the negative electrode, and the counter electrode, which is paired with the working electrode, is the positive electrode. By changing the potential difference applied between the working electrode and the counter electrode, electrons can be supplied to the working electrode to adsorb carbon dioxide onto the carbon dioxide adsorbent on the working electrode, or electrons can be released from the working electrode to desorb the adsorbed carbon dioxide. In other words, by applying an adsorption potential between the working electrode and the counter electrode of the electrochemical cell 12a, carbon dioxide can be adsorbed onto the electrochemical cell 12a (the carbon dioxide adsorbent on the working electrode). Furthermore, by applying a desorption potential different from the adsorption potential between the working electrode and the counter electrode of the electrochemical cell 12a, carbon dioxide can be desorbed from the electrochemical cell 12a.

[0022] The working electrode current collector layer consists of a porous conductive material having pores through which carbon dioxide-containing air can pass. The working electrode current collector layer only needs to have gas permeability and conductivity, and materials such as metallic materials or carbonaceous materials can be used as the material for forming the working electrode current collector layer.

[0023] The working electrode is formed from a mixture of materials including a carbon dioxide adsorbent, a conductive material, and a binder. The carbon dioxide adsorbent has the property of adsorbing carbon dioxide by accepting electrons and desorbing the adsorbed carbon dioxide by releasing electrons. For example, polyanthraquinone can be used as the carbon dioxide adsorbent. The conductive material forms a conductive path to the carbon dioxide adsorbent. For example, carbon materials such as carbon nanotubes, carbon black, and graphene can be used as the conductive material. The binder is for holding the carbon dioxide adsorbent and the conductive material. For example, a conductive resin can be used as the binder. For example, the conductive resin can be an epoxy resin containing Ag as a conductive filler, or a fluororesin such as polytetrafluoroethylene (PTFE) or polyvinylidene fluoride (PVDF).

[0024] The counter electrode is formed from a mixture of materials including an electroactivating auxiliary, a conductive substance, and a binder. The conductive substance and binder of the counter electrode are the same as those of the working electrode, so their explanation is omitted. The electroactivating auxiliary of the counter electrode is composed of a material having an active substance that acts as an electron donor. The electroactivating auxiliary of the counter electrode is an auxiliary electroactive species that facilitates electron transfer with the carbon dioxide adsorbent of the working electrode. As an electroactivating auxiliary, for example, a metal complex that enables electron transfer by changing the valence of metal ions can be used. Examples of such metal complexes include cyclopentadienyl metal complexes such as ferrocene, nickerosene, and cobaltocene, or porphyrin metal complexes. These metal complexes may be polymers or monomers. The counter electrode current collector layer is formed from a conductive material such as a metal material or a carbonaceous material, similar to the working electrode current collector layer.

[0025] A separator is placed between the working electrode and the counter electrode to separate them. The separator is an insulating ion-permeable membrane that prevents physical contact between the working electrode and the counter electrode, thereby suppressing electrical short circuits, while also allowing ions to pass through. Cellulose membranes, polymers, composite materials of polymers and ceramics, etc., can be used as separators.

[0026] Furthermore, the electrochemical cell 12a is provided with an electrolyte that spans both the working electrode and the counter electrode. For example, an ionic liquid can be used as the electrolyte. An ionic liquid is a salt of a liquid that is non-volatile at room temperature and pressure.

[0027] Although not shown in the illustration, each blower 14 has a fan that is rotated by a motor. The blowers 14 are turned on and off and their rotation speed is controlled by the control device 17. The blowers 14 are turned on by the control device 17 when carbon dioxide is adsorbed onto the electrochemical cell 12a in the recovery unit 12, or when the adsorbed carbon dioxide is desorbed from the electrochemical cell 12a and the desorbed carbon dioxide is supplied to the carbon dioxide supply destination 16. Alternatively, a pump capable of circulating air may be used as the blower 14.

[0028] The flow path switching valve 15 is a three-way valve that switches the flow path of the air (air from which carbon dioxide has been removed or air containing a high concentration of carbon dioxide) flowing through the flow path piping downstream of the blower 14. The switching of the flow path of the flow path switching valve 15 is controlled by the control device 17. Specifically, when carbon dioxide is adsorbed into the electrochemical cell 12a in the recovery unit 12, the control device 17 controls the flow path switching valve 15 to connect the flow path piping downstream of the blower 14 to the outside (atmosphere). As a result, the air from which carbon dioxide has been removed is released to the outside. On the other hand, when the electrochemical cell 12a desorbs the adsorbed carbon dioxide, the control device 17 controls the flow path switching valve 15 to connect the flow path piping downstream of the blower 14 to the carbon dioxide supply destination 16. As a result, air containing carbon dioxide desorbed from the electrochemical cell 12a, that is, air containing a higher concentration of carbon dioxide than usual (for example, air with a carbon dioxide concentration about three times that of normal), is supplied to the carbon dioxide supply destination 16.

[0029] The carbon dioxide sensor 16a detects the carbon dioxide concentration at the carbon dioxide supply destination 16 at predetermined time intervals. When the carbon dioxide concentration detected by the carbon dioxide sensor 16a reaches a predetermined target upper limit concentration, the control device 17 stops supplying carbon dioxide from the carbon dioxide supply device 10. Furthermore, for example, if the carbon dioxide supply destination 16 is an agricultural facility, and the carbon dioxide concentration decreases due to photosynthesis of crops and reaches a predetermined target lower limit concentration, the control device 17 resumes supplying carbon dioxide from the carbon dioxide supply device 10.

[0030] The control device 17 consists of a well-known microcomputer including a CPU, ROM, and RAM, and its peripheral devices. The peripheral devices include sensors 12b and 16a, an electrochemical cell 12a, and I / O circuits for exchanging signals with the blower 14.

[0031] The control device 17 performs various calculations based on a control program stored in a storage medium such as ROM, and controls the operation of various controlled devices such as the first on-off valve 11, the electrochemical cell 12a in the recovery unit 12, the second on-off valve 13, the blower 14, and the flow path switching valve 15. For example, when supplying carbon dioxide to the carbon dioxide supply destination 16, the control device 17 controls the operation of various controlled devices so that a series of control sequences, including adsorption mode and desorption mode, are executed in the carbon dioxide supply device 10. Furthermore, the control device 17 executes a learning mode process to create adsorption learning data for setting the application time of the adsorption potential in the adsorption mode (which can also be called the execution time of the adsorption mode) and desorption learning data for setting the application time of the desorption potential in the desorption mode (which can also be called the execution time of the desorption mode). The learning mode process will be described in detail later. In addition, the control device 17 can control the rotation speed of the blower 14 while the adsorption mode and desorption mode are being executed.

[0032] In this case, when supplying air containing a large amount of carbon dioxide to the carbon dioxide supply destination 16, the carbon dioxide supply device 10 alternately performs adsorption mode and desorption mode. In this case, for example, if the adsorption potential is continuously applied to the electrochemical cell 12a even though the electrochemical cell 12a has already adsorbed adsorbable carbon dioxide, or if the desorption potential is continuously applied even though the desorption of carbon dioxide adsorbed on the electrochemical cell 12a has substantially finished, energy will be wasted, leading to an increase in running costs.

[0033] Therefore, in this embodiment, the control device 17 generates adsorption learning data that represents the relationship between elapsed time and the amount of carbon dioxide adsorbed by the electrochemical cell 12a, based on the change in the concentration of carbon dioxide in the recovery device 12 when carbon dioxide is actually adsorbed by the electrochemical cell 12a. Then, the control device 17 sets the application time of the adsorption potential in the adsorption mode based on the generated adsorption learning data, thereby preventing the unnecessary application of the adsorption potential and the consumption of energy, and thus reducing running costs.

[0034] Furthermore, in this embodiment, the control device 17 generates desorption learning data that represents the relationship between elapsed time and the amount of carbon dioxide desorbed from the electrochemical cell 12a, based on the change in carbon dioxide concentration in the recovery unit 12 when carbon dioxide is actually desorbed from the electrochemical cell 12a. Then, the control device 17 sets the application time of the desorption potential in the desorption mode based on the generated desorption learning data, thereby preventing the unnecessary application of the desorption potential and the consumption of energy, and further reducing running costs.

[0035] The carbon dioxide supply process performed by the control device 17, which includes a learning mode process for creating adsorption learning data and desorption learning data, will be described below with reference to the flowchart in Figure 2.

[0036] As shown in the flowchart of Figure 2, the control device 17 first determines in step S100 whether or not to execute the learning mode. The control device 17 can determine whether or not to execute the learning mode according to, for example, the learning mode execution conditions shown in Figure 4. Specifically, the learning mode execution conditions may include the occurrence of a learning mode execution request by the user, the start of operation by turning on the power of the carbon dioxide supply device 10, nighttime (when the carbon dioxide supply device 10 is not in use), maintenance such as cleaning of the electrochemical cell 12a, or immediately after replacement of the electrochemical cell 12a.

[0037] Furthermore, when the carbon dioxide supply device 10 is applied to agricultural use, the number of times the learning mode is executed may be changed depending on the weather, region, season, and scale of the supply destination. For example, in sunny weather, or in regions or seasons with long hours of sunshine, photosynthesis by crops is promoted, so the carbon dioxide supply time becomes relatively longer. Similarly, if the scale of the carbon dioxide supply destination is large, the carbon dioxide supply time also becomes relatively longer. This is because if the carbon dioxide concentration in the external environment changes during a long period of carbon dioxide supply, setting the execution time of the adsorption mode or desorption mode using the adsorption learning data or desorption learning data from before the change in carbon dioxide concentration may not result in setting an appropriate execution time.

[0038] In step S100, if the control device 17 determines that the conditions for executing the learning mode are met and that the learning mode should be executed, it proceeds to step S110. On the other hand, if the control device 17 determines that the learning mode should not be executed, it proceeds to step S120.

[0039] In step S110, the control device 17 performs a learning mode process. The learning mode process will be described in detail later. After the learning mode process is completed, the control device 17 proceeds to step S160. In step S120, the control device 17 sets the execution time of the adsorption mode included in the series of control sequences. The process for setting this adsorption mode execution time will be described in detail after the explanation of the learning mode process.

[0040] In step S130, the control device 17 starts the adsorption mode. In this adsorption mode, as shown in Figure 3(a), the first on-off valve 11 is opened to allow air containing carbon dioxide to be introduced into the recovery unit 12. The second on-off valve 13 is also opened to allow the air from which carbon dioxide has been removed to be discharged from the recovery unit 12. The blower 14 is driven at a specified rotational speed so that air is drawn into the recovery unit 12. The flow path switching valve 15 connects the flow path piping downstream of the blower 14 to the outside. Furthermore, in the adsorption mode, an adsorption potential is applied between the working electrode and the counter electrode of the electrochemical cell 12a of the recovery unit 12, such that the carbon dioxide adsorbent on the working electrode can adsorb carbon dioxide. This adsorption potential is a specified potential and is variable according to the operation type described later.

[0041] Through the control of the first on-off valve 11, the electrochemical cells 12a of the recovery unit 12, the second on-off valve 13, the blower 14, and the flow path switching valve 15, in the adsorption mode, as shown by the dotted arrow in Figure 3(a), air containing carbon dioxide passes through the first on-off valve 11 and enters the recovery unit 12. The carbon dioxide contained in the air that enters the recovery unit 12 is adsorbed by multiple electrochemical cells 12a. As a result, carbon dioxide is removed from the air. The air from which carbon dioxide has been removed passes through the second on-off valve 13 and the blower 14, is guided by the flow path switching valve 15 to a flow path piping that leads to the outside, and is released to the outside through that flow path piping.

[0042] In step S140, the control device 17 determines whether the suction mode execution time set in step S120 has elapsed. In this determination process, if the control device 17 determines that the suction mode execution time has elapsed, it proceeds to step S150. On the other hand, if the control device 17 determines that the suction mode execution time has not elapsed, it repeatedly executes the determination process in step S140 until the suction mode execution time has elapsed.

[0043] In step S150, the process for terminating the adsorption mode is executed. Specifically, the control device 17 terminates the application of the adsorption potential between the working electrode and the counter electrode of the electrochemical cell 12a. The control device 17 also resets the count value of the counter that counts the adsorption mode execution time.

[0044] In step S160, the control device 17 sets the execution time of the detachment mode included in the series of control sequences. The process for setting this detachment mode execution time will be described in detail after the learning mode process is described.

[0045] In step S170, the control device 17 starts the desorption mode. In this desorption mode, as shown in Figure 3(b), the first on-off valve 11 is opened to allow air containing carbon dioxide to be introduced into the recovery unit 12. The second on-off valve 13 is also opened to allow the air from which carbon dioxide has been removed to be discharged from the recovery unit 12. The blower 14 is driven at a specified rotational speed so that air is drawn into the recovery unit 12. The flow path switching valve 15 connects the flow path piping downstream of the blower 14 to the carbon dioxide supply destination 16. Furthermore, in the desorption mode, a desorption potential is applied between the working electrode and the counter electrode of the electrochemical cell 12a of the recovery unit 12, which allows carbon dioxide to be desorbed from the carbon dioxide adsorbent at the working electrode. This desorption potential is a specified potential and is variable according to the operation type described later.

[0046] Through the control of the first on-off valve 11, the electrochemical cells 12a of the recovery unit 12, the second on-off valve 13, the blower 14, and the flow path switching valve 15, in the desorption mode, as shown by the dotted arrow in Figure 3(b), air containing carbon dioxide passes through the first on-off valve 11 and enters the recovery unit 12. The air that enters the recovery unit 12 is mixed with the carbon dioxide desorbed from the multiple electrochemical cells 12a, resulting in air rich in carbon dioxide. This air rich in carbon dioxide passes through the second on-off valve 13 and the blower 14, and is guided by the flow path switching valve 15 to a flow path piping leading to the carbon dioxide supply destination 16, where it is supplied.

[0047] In step S180, the control device 17 determines whether the desorption mode execution time set in step S160 has elapsed, or whether the carbon dioxide concentration at the carbon dioxide supply destination 16 has reached the target upper limit concentration. In this determination process, if the control device 17 determines that the desorption mode execution time has elapsed or that the carbon dioxide concentration at the carbon dioxide supply destination 16 has reached the target upper limit concentration, it proceeds to step S190. On the other hand, if the control device 17 determines that the desorption mode execution time has not elapsed and the carbon dioxide concentration at the carbon dioxide supply destination 16 has not reached the target upper limit concentration, it repeatedly executes the determination process in step S180 until the desorption mode execution time has elapsed or until the carbon dioxide concentration at the carbon dioxide supply destination 16 reaches the target upper limit concentration.

[0048] In step S190, the control device performs the termination process for the desorption mode. Specifically, the control device 17 terminates the application of the desorption potential between the working electrode and the counter electrode of the electrochemical cell 12a. The control device 17 also resets the count value of the counter that counts the execution time of the desorption mode.

[0049] In step S200, the control device 17 determines whether the carbon dioxide concentration at the carbon dioxide supply destination 16 has reached the target upper limit concentration by performing the adsorption mode and desorption mode described above. If it determines that the carbon dioxide concentration at the carbon dioxide supply destination 16 has reached the target upper limit concentration, the control device 17 proceeds to step S210. On the other hand, if it determines that the carbon dioxide concentration at the carbon dioxide supply destination 16 has not reached the target upper limit concentration, the control device 17 returns to step S120 and repeats the execution of the adsorption mode and desorption mode.

[0050] In step S210, the control device 17 determines, for example, whether the carbon dioxide supply destination 16 is an agricultural facility and whether the carbon dioxide concentration has decreased due to photosynthesis of crops and reached the target lower limit concentration. If it determines that the carbon dioxide concentration at the carbon dioxide supply destination 16 has reached the target lower limit concentration, the control device 17 returns to step S120 and resumes the supply of carbon dioxide by the carbon dioxide supply device 10. On the other hand, if it determines that the carbon dioxide concentration at the carbon dioxide supply destination 16 has not reached the target lower limit concentration, the control device 17 repeatedly performs the determination process in step S210 until the carbon dioxide concentration reaches the target lower limit concentration.

[0051] Next, the learning mode processing will be explained. Details of the learning mode processing are shown in the flowchart in Figure 5. In step S300 of the flowchart in Figure 5, a predetermined estimated time is set as the pre-adsorption time, during which it is estimated that an amount of carbon dioxide equivalent to the maximum adsorption capacity of the electrochemical cell 12a will be adsorbed onto the electrochemical cell 12a.

[0052] In the following step S310, the control device 17 starts a pre-adsorption mode in which carbon dioxide is adsorbed onto the electrochemical cell 12a for the above-mentioned pre-adsorption time as preparation for learning. In this pre-adsorption mode, as shown in Figure 6(a), the first on-off valve 11 is opened to allow air containing carbon dioxide to be introduced into the recovery unit 12. The second on-off valve 13 is also opened to allow the air from which carbon dioxide has been removed to be discharged from the recovery unit 12. The blower 14 is driven at a predetermined constant rotational speed so that a predetermined amount of air is drawn into the recovery unit 12. The flow path switching valve 15 connects the flow path piping downstream of the blower 14 to the outside. Furthermore, in the pre-adsorption mode, a pre-adsorption potential is applied between the working electrode and the counter electrode of the electrochemical cell 12a of the recovery unit 12, so that the carbon dioxide adsorbent of the working electrode can adsorb carbon dioxide. The pre-adsorption potential is a predetermined constant potential.

[0053] Through the control of the first on-off valve 11, the electrochemical cells 12a of the recovery unit 12, the second on-off valve 13, the blower 14, and the flow path switching valve 15, in the pre-preparation adsorption mode, as shown by the dotted arrow in Figure 6(a), air containing carbon dioxide passes through the first on-off valve 11 and enters the recovery unit 12. The carbon dioxide contained in the air that enters the recovery unit 12 is adsorbed by multiple electrochemical cells 12a. As a result, carbon dioxide is removed from the air. The air from which carbon dioxide has been removed passes through the second on-off valve 13 and the blower 14, is guided by the flow path switching valve 15 to a flow path piping that leads to the outside, and is released to the outside through that flow path piping.

[0054] In step S320, the control device 17 determines whether the pre-adsorption time has elapsed. If the control device 17 determines that the pre-adsorption time has elapsed, it proceeds to step S330. On the other hand, if the control device 17 determines that the pre-adsorption time has not elapsed, it repeatedly executes the determination process in step S320 until the pre-adsorption time has elapsed.

[0055] In step S330, the termination process for the pre-preparation adsorption mode is executed. Specifically, the control device 17 terminates the application of the pre-preparation adsorption potential between the working electrode and the counter electrode of the electrochemical cell 12a. The control device 17 also closes the first and second on-off valves 11 and 13 to block the inflow of air containing carbon dioxide from the outside into the recovery unit 12 and the outflow of air from the recovery unit 12 from which carbon dioxide has been removed. Furthermore, the control device 17 stops the operation of the blower 14. The control device 17 also resets the count value of the counter that counts the pre-preparation adsorption time.

[0056] As described above, it is also possible to terminate the pre-adsorption mode by determining that an amount of carbon dioxide equivalent to the maximum adsorption amount has been adsorbed onto the electrochemical cell 12a in the recovery unit 12, without setting a pre-adsorption time or determining the elapsed time of the set pre-adsorption time. Specifically, the carbon dioxide concentration in the atmosphere downstream of the electrochemical cell 12a, after carbon dioxide has been removed by the electrochemical cell 12a, is measured by the carbon dioxide sensor 12b. When the change in carbon dioxide concentration downstream of the electrochemical cell 12a indicates that the electrochemical cell 12a has adsorbed the maximum amount of carbon dioxide; that is, after carbon dioxide has been removed by the electrochemical cell 12a and the carbon dioxide concentration has decreased, an amount of carbon dioxide equivalent to the maximum adsorption amount has been adsorbed onto the electrochemical cell 12a, and it is no longer possible to adsorb any more carbon dioxide, causing the carbon dioxide concentration to rise. In this case, the execution time of the pre-adsorption mode, from the start of the pre-adsorption mode to the end of the pre-adsorption mode, is measured by a counter or the like.

[0057] In step S340, the control device 17 executes a detachment learning data creation process to create detachment learning data. In step S350, the control device 17 executes an adsorption learning data creation process to create adsorption learning data. Figure 7 is a flowchart detailing the detachment learning data creation process. Figure 10 is a flowchart detailing the adsorption learning data creation process. The detachment learning data creation process and the adsorption learning data creation process will be described in detail below with reference to their respective flowcharts.

[0058] In the desorption learning data creation process, first, as shown in step S400 of the flowchart in Figure 7, the control device 17 starts the learning desorption mode. In this learning desorption mode, as shown in Figure 6(b), the control device 17 applies a desorption potential between the working electrode and the counter electrode of the electrochemical cell 12a that is capable of desorbing the carbon dioxide adsorbed on the carbon dioxide adsorbent of the working electrode by the pre-preparation adsorption mode described above. In the learning desorption mode, the first and second on-off valves 11 and 13 are kept closed, and the blower 14 is also kept stopped.

[0059] In step S410, the control device 17 starts monitoring the carbon dioxide concentration in the recovery unit 12 using the carbon dioxide sensor 12b. For example, the control device 17 samples the carbon dioxide concentration in the recovery unit 12, as measured by the carbon dioxide sensor 12b, at predetermined time intervals. In this way, the control device 17 can measure the change in the carbon dioxide concentration in the recovery unit 12 over time using the carbon dioxide sensor 12b, while keeping the recovery unit 12 sealed and applying a desorption potential to the electrochemical cell 12a that adsorbs carbon dioxide.

[0060] In step S420, the control device 17 determines whether the change in carbon dioxide concentration measured by the carbon dioxide sensor 12b has fallen below a predetermined value. Once the desorption of carbon dioxide adsorbed on the electrochemical cell 12a is complete, the increase in carbon dioxide concentration in the recovery unit 12 almost stops, and the change in carbon dioxide concentration falls below a predetermined value. Therefore, if the change in carbon dioxide concentration falls below a predetermined value, it can be considered that the desorption of carbon dioxide from the electrochemical cell 12a has substantially finished.

[0061] Whether or not the desorption of carbon dioxide from the electrochemical cell 12a has substantially finished can also be determined by another method. For example, the carbon dioxide concentration in the recovery unit 12 when the desorption of carbon dioxide from the electrochemical cell 12a is completely finished can be determined from the maximum amount of carbon dioxide adsorbed by the electrochemical cell 12a and the volume of the recovery unit 12. Furthermore, based on the determined carbon dioxide concentration at the completion of desorption, a desorption concentration threshold can be set at which the desorption of carbon dioxide from the electrochemical cell 12a can be considered to be almost complete. Then, when the carbon dioxide concentration measured by the carbon dioxide sensor 12b reaches the desorption concentration threshold, it can be determined that the desorption of carbon dioxide from the electrochemical cell 12a has substantially finished.

[0062] If a positive determination is made in step S420, the control device 17 proceeds to step S430. On the other hand, if a negative determination is made, the control device 17 repeatedly performs the determination in step S420 until a positive determination is made. In step S430, the control device 17 terminates monitoring of the carbon dioxide concentration in the recovery unit 12 using the carbon dioxide sensor 12b. In the following step S440, the control device 17 stops applying the desorption potential between the working electrode and the counter electrode of the electrochemical cell 12a, thereby ending the learning desorption mode.

[0063] Figure 8 is a graph showing an example of the change in carbon dioxide concentration in the recovery unit 12 over time, measured using the carbon dioxide sensor 12b in the learning desorption mode. As shown in the graph in Figure 8, a relatively low carbon dioxide concentration is detected at the start of monitoring. However, by applying a desorption potential to the electrochemical cell 12a, carbon dioxide is desorbed from the electrochemical cell 12a and released into the recovery unit 12, so the carbon dioxide concentration in the recovery unit 12 increases over time. Monitoring of the carbon dioxide concentration is stopped when the increase in carbon dioxide concentration has almost stopped. This makes it possible to measure the change in carbon dioxide concentration in the recovery unit 12 over time, as shown in the graph in Figure 8.

[0064] In step S450, the control device 17 creates desorption learning data that represents the relationship between elapsed time and the amount of carbon dioxide desorbed from the electrochemical cell 12a, based on the change in carbon dioxide concentration in the recovery unit 12 over time, as shown in Figure 8. Figure 9 is a graph showing an example of desorption learning data. Since the volume in the recovery unit 12 is known, the control device 17 can calculate desorption learning data that represents the relationship between elapsed time and the amount of carbon dioxide desorbed, as shown in Figure 9, from the change in carbon dioxide concentration over time, as shown in Figure 8. In step S460, the control device 17 stores the created desorption learning data in a storage medium such as RAM, disk, or flash memory. This completes the desorption learning data creation process.

[0065] Next, the adsorption learning data creation process will be described. In the adsorption learning data creation process, first, as shown in step S500 of the flowchart in Figure 10, the control device 17 starts the learning adsorption mode. In this learning adsorption mode, as shown in Figure 6(c), the control device 17 applies a desorption potential between the working electrode and the counter electrode of the electrochemical cell 12a that allows the carbon dioxide released into the recovery unit 12 by the learning desorption mode described above to be adsorbed onto the carbon dioxide adsorbent of the working electrode. In the learning adsorption mode, the first and second on-off valves 11 and 13 are kept closed, and the blower 14 is also kept stopped.

[0066] In step S510, the control device 17 starts monitoring the carbon dioxide concentration in the recovery unit 12 using the carbon dioxide sensor 12b. For example, the control device 17 samples the carbon dioxide concentration in the recovery unit 12, as measured by the carbon dioxide sensor 12b, at predetermined time intervals. In this way, the control device 17 can measure the change in the carbon dioxide concentration in the recovery unit 12 over time using the carbon dioxide sensor 12b, while keeping the recovery unit 12 sealed and with carbon dioxide released into the recovery unit 12 present, when an adsorption potential is applied to the electrochemical cell 12a.

[0067] In step S520, the control device 17 determines whether the change in carbon dioxide concentration measured by the carbon dioxide sensor 12b has fallen below a predetermined value. When the adsorption of carbon dioxide in the recovery unit 12 by the electrochemical cell 12a is completed, the decrease in carbon dioxide concentration in the recovery unit 12 almost stops, and the change in carbon dioxide concentration falls below a predetermined value. Therefore, when the change in carbon dioxide concentration falls below a predetermined value, it can be considered that the adsorption of carbon dioxide by the electrochemical cell 12a has substantially finished.

[0068] Whether or not the adsorption of carbon dioxide by the electrochemical cell 12a has substantially finished can also be determined by another method. For example, since the adsorption learning data creation process is executed following the desorption learning data creation process, an adsorption concentration threshold can be set based on the carbon dioxide concentration in the recoverer 12 at the start of the desorption learning data creation process, which indicates that the adsorption of carbon dioxide by the electrochemical cell 12a has substantially finished. This is because if the carbon dioxide concentration in the recoverer 12 decreases to the adsorption concentration threshold based on the carbon dioxide concentration at the start of the desorption learning data creation process, the carbon dioxide desorbed from the electrochemical cell 12a in the learning desorption mode can be considered to have been adsorbed again by the electrochemical cell 12a. Therefore, when the carbon dioxide concentration measured by the carbon dioxide sensor 12b reaches the adsorption concentration threshold, it can be considered that the adsorption of carbon dioxide by the electrochemical cell 12a has substantially finished.

[0069] If a positive determination is made in step S520, the control device 17 proceeds to step S530. On the other hand, if a negative determination is made, the control device 17 repeatedly performs the determination in step S520 until a positive determination is made. In step S530, the control device 17 stops monitoring the carbon dioxide concentration in the recovery unit 12 using the carbon dioxide sensor 12b. In the following step S540, the control device 17 stops applying the adsorption potential between the working electrode and the counter electrode of the electrochemical cell 12a, thereby ending the learning adsorption mode. At this time, the control device 17 measures and stores the duration of the learning adsorption mode from its start to its end.

[0070] Figure 11 is a graph showing an example of the change in carbon dioxide concentration in the recovery unit 12 over time, measured using the carbon dioxide sensor 12b in the learning adsorption mode. As shown in the graph in Figure 11, a relatively high carbon dioxide concentration is detected at the start of monitoring. However, by applying an adsorption potential to the electrochemical cell 12a, the carbon dioxide in the recovery unit 12 is adsorbed onto the electrochemical cell 12a, so the carbon dioxide concentration in the recovery unit 12 decreases over time. Monitoring of the carbon dioxide concentration is stopped when the decrease in carbon dioxide concentration has almost stopped. This makes it possible to measure the change in carbon dioxide concentration in the recovery unit 12 over time, as shown in the graph in Figure 11.

[0071] In step S550, the control device 17 creates adsorption learning data representing the relationship between elapsed time and the amount of carbon dioxide adsorbed onto the electrochemical cell 12a, based on the change in carbon dioxide concentration in the recovery unit 12 over time, as shown in Figure 11. Figure 12 is a graph showing an example of adsorption learning data. Since the volume in the recovery unit 12 is known, the control device 17 can calculate adsorption learning data representing the relationship between elapsed time and the amount of carbon dioxide adsorbed, as shown in Figure 12, from the change in carbon dioxide concentration over time, as shown in Figure 11.

[0072] In step S560, it is determined whether the pre-preparation adsorption time set in step S300 of the flowchart in Figure 5 matches the execution time of the learning adsorption mode. If it is determined that they do not match, the control device 17 proceeds to step S570. If it is determined that they match, the control device 17 proceeds to step S580.

[0073] In step S570, the control device 17 updates the adsorption learning data created in step S550 according to the difference between the pre-preparation adsorption time and the time spent in the learning adsorption mode. For example, the control device updates the adsorption learning data by changing the elapsed time relative to the amount of carbon dioxide adsorbed according to the ratio of the pre-preparation adsorption time to the time spent in the learning adsorption mode. Specifically, if the pre-preparation adsorption time is longer than the time spent in the learning adsorption mode, the adsorption learning data is expanded in the time axis direction according to the ratio of the pre-preparation adsorption time to the time spent in the learning adsorption mode, as shown in Figure 13. Conversely, if the pre-preparation adsorption time is shorter than the time spent in the learning adsorption mode, the adsorption learning data is reduced in the time axis direction according to the ratio of the pre-preparation adsorption time to the time spent in the learning adsorption mode, as shown in Figure 13. In addition to the ratio of the pre-preparation adsorption time to the time spent in the learning adsorption mode, it is also possible to calculate the ratio of expansion or reduction of the adsorption learning data in the time axis direction by multiplying the difference between the pre-preparation adsorption time and the time spent in the learning adsorption mode by a predetermined coefficient.

[0074] As described above, the adsorption learning data is created based on the change in carbon dioxide concentration inside the recoverer 12 when carbon dioxide inside the recoverer 12 is adsorbed onto the electrochemical cell 12a while the recoverer 12 is sealed. In contrast, in the adsorption mode included in a series of control sequences executed in the carbon dioxide supply device 10 to supply carbon dioxide to the carbon dioxide supply destination 16, the recoverer 12 is not sealed, and air containing carbon dioxide flows through the recoverer 12 by the blower 14. To compensate for this difference in situations, this embodiment utilizes the difference between the pre-preparation adsorption time and the learning adsorption mode execution time. That is, the pre-preparation adsorption time is the time during which carbon dioxide is adsorbed onto the electrochemical cell 12a while air containing carbon dioxide flows through the recoverer 12, similar to the adsorption mode included in the series of control sequences. Therefore, by expanding or contracting the adsorption learning data in the time axis direction according to the difference between the pre-preparation adsorption time and the learning adsorption mode execution time, the adsorption learning data can be updated to fit the adsorption mode included in the series of control sequences.

[0075] In step S580, the control device 17 stores the created or updated suction learning data in a storage medium such as RAM, disk, or flash memory. This completes the suction learning data creation process.

[0076] Next, the process of setting the suction mode execution time in step S120 of the flowchart in Figure 2 will be explained in detail with reference to the flowchart in Figure 14.

[0077] In step S600, the control device 17 determines whether or not modification of the adsorption learning data is necessary, depending on the operation type of the adsorption mode of the carbon dioxide supply device 10. In this embodiment, as shown in Figure 15, one of the following operation types of the adsorption mode of the carbon dioxide supply device 10 is selected, depending on the selection conditions: balanced type, energy-saving type, or rapid adsorption type. If the balanced type is selected, it is determined that modification of the adsorption learning data is unnecessary. If the energy-saving type or rapid adsorption type is selected, it is determined that modification of the adsorption learning data is necessary. If the control device 17 determines that modification of the adsorption learning data is necessary, it proceeds to step S610. If it determines that modification of the adsorption learning data is unnecessary, it proceeds to step S640.

[0078] In the balanced configuration, standard control values ​​(default values) are used for both the adsorption potential applied to the electrochemical cell 12a and the control voltage driving the blower 14. The standard control values ​​for the adsorption potential applied to the electrochemical cell 12a and the control voltage driving the blower 14 are the same as the control values ​​used when the pre-preparation adsorption mode is executed in learning mode. Therefore, if the user specifies the balanced configuration, no modification of the adsorption learning data is necessary.

[0079] The energy-saving type uses lower control values ​​than the balanced type for the adsorption potential applied to the electrochemical cell 12a and the control voltage driving the blower 14. Therefore, the energy-saving type requires less energy to drive the carbon dioxide supply device 10 than the balanced type. However, the energy-saving type takes longer for carbon dioxide to be adsorbed by the electrochemical cell 12a than the balanced type. For this reason, if the energy-saving type is selected, it is necessary to modify the adsorption learning data.

[0080] The rapid adsorption type uses higher control values ​​than the balanced type for the adsorption potential applied to the electrochemical cell 12a and the control voltage driving the blower 14. Therefore, the rapid adsorption type requires more energy to drive the carbon dioxide supply device 10 than the balanced type. However, the rapid adsorption type can adsorb carbon dioxide by the electrochemical cell 12a more quickly than the balanced type. For this reason, even when the rapid adsorption type is selected, it is necessary to modify the adsorption learning data.

[0081] The selection criteria for choosing one of the three operating types—balanced, energy-saving, or rapid adsorption—can be arbitrarily set. Generally, the selection criteria for the energy-saving type should be set so that it is selected when only a small amount of carbon dioxide needs to be supplied to the carbon dioxide supply destination 16. For example, as shown in Figure 15, the selection criteria for the energy-saving type could be for operation at night, during bad weather, or at the user's request. Generally, the selection criteria for the rapid adsorption type should be set so that it is selected when a large amount of carbon dioxide needs to be supplied quickly to the carbon dioxide supply destination 16. For example, as shown in Figure 15, the rapid adsorption type could be used during the daytime, during periods of active photosynthesis by crops, or at the user's request. The balanced type is selected when neither the energy-saving nor the rapid adsorption selection criteria apply, or at the user's request.

[0082] In step S610, the control device 17 determines control values ​​for the adsorption potential applied to the electrochemical cell 12a and the control voltage driving the blower 14, according to the selected operation type. As described above, the default value is used for the balanced type. However, the control values ​​for the energy-saving type and the rapid adsorption type may be fixed values ​​appropriate to each type, or they may be variable values. In other words, in the case of the energy-saving type and the rapid adsorption type, the required amount of carbon dioxide to the carbon dioxide supply destination 16 may change, so the control value may be varied according to that required amount.

[0083] In step S620, the control device 17 modifies the adsorption learning data based on the control value set in step S610. For example, the control device 17 modifies the adsorption learning data according to the difference in magnitude between the normal control value (default value) and the set control value. For example, the adsorption learning data can be modified by expanding or contracting the adsorption learning data in the time axis direction according to the ratio of the set control value to the normal control value, as shown in Figure 16. As shown in Figure 16, if the energy-saving type is selected as the operation type, the adsorption learning data is modified to expand in the time axis direction, and if the rapid adsorption type is selected, the adsorption learning data is modified to contract in the time axis direction. In addition to the ratio of the set control value to the normal control value, it is also possible to calculate the ratio of expanding or contracting the adsorption learning data in the time axis direction by multiplying the difference between the normal control value and the set control value by a predetermined coefficient.

[0084] In step S630, the control device 17 stores the corrected suction learning data in a storage medium such as RAM, disk, or flash memory.

[0085] In step S640, the control device 17 sets the adsorption mode execution time based on the adsorption learning data. At this time, the control device 17 sets the adsorption mode execution time within a range less than or equal to the maximum adsorption time in the adsorption learning data. This prevents the unnecessary application of the adsorption potential, such as continuing to apply the adsorption potential even though carbon dioxide that can be adsorbed by the electrochemical cell 12a has already been adsorbed, thereby reducing running costs.

[0086] Next, the process of setting the execution time of the detachment mode in step S160 of the flowchart in Figure 2 will be explained in detail with reference to the flowchart in Figure 17.

[0087] In step S700, the control device 17 determines whether or not modification of the desorption learning data is necessary, depending on the operation type of the desorption mode of the carbon dioxide supply device 10. In this embodiment, as shown in Figure 18, one of the following operation types of the desorption mode of the carbon dioxide supply device 10 is selected, depending on the selection conditions: balanced type, energy-saving type, or rapid desorption type. If the balanced type is selected, it is determined that modification of the desorption learning data is unnecessary. If the energy-saving type or rapid desorption type is selected, it is determined that modification of the desorption learning data is necessary. If the control device 17 determines that modification of the desorption learning data is necessary, it proceeds to step S710. If it determines that modification of the desorption learning data is unnecessary, it proceeds to step S740.

[0088] In the balanced configuration, standard control values ​​(default values) are used for both the desorption potential applied to the electrochemical cell 12a and the control voltage driving the blower 14. The standard control value for the desorption potential is the same as the control value used when the learning-required desorption mode is executed in learning mode. Therefore, if the user specifies the balanced configuration, no modification of the desorption learning data is necessary.

[0089] The energy-saving type uses lower control values ​​than the balanced type for the desorption potential applied to the electrochemical cell 12a and the control voltage driving the blower 14. Therefore, the energy-saving type requires less energy to drive the carbon dioxide supply device 10 than the balanced type. However, the energy-saving type takes longer to desorb carbon dioxide from the electrochemical cell 12a than the balanced type. For this reason, if the energy-saving type is selected, it is necessary to modify the desorption learning data.

[0090] The rapid desorption type uses higher control values ​​than the balanced type for the desorption potential applied to the electrochemical cell 12a and the control voltage driving the blower 14. Therefore, the rapid desorption type requires more energy to drive the carbon dioxide supply device 10 than the balanced type. However, the rapid desorption type can desorb carbon dioxide from the electrochemical cell 12a more quickly than the balanced type. For this reason, even when the rapid desorption type is selected, it is necessary to modify the desorption learning data.

[0091] The selection criteria for choosing between the balanced, energy-saving, and rapid desorption operation types can be arbitrarily set. Generally, the selection criteria for the energy-saving type should be set so that it is selected when only a small amount of carbon dioxide needs to be supplied to the carbon dioxide supply destination 16. For example, as shown in Figure 19, the selection criteria for the energy-saving type can be when it is sufficient to maintain the carbon dioxide concentration at the carbon dioxide supply destination 16, during bad weather, when the scale of the carbon dioxide supply destination is small, or when requested by the user. Generally, the selection criteria for the rapid desorption type should be set so that it is selected when it is necessary to quickly supply a large amount of carbon dioxide to the carbon dioxide supply destination 16. For example, as shown in Figure 18, the rapid desorption type can be selected when it is necessary to quickly change the carbon dioxide concentration at the carbon dioxide supply destination 16, such as early in the morning, when the scale of the carbon dioxide supply destination 16 is large, or when requested by the user. The balanced type is selected when neither the selection criteria for the energy-saving type nor the rapid adsorption type apply, or when requested by the user.

[0092] In step S710, the control device 17 determines control values ​​for the desorption potential applied to the electrochemical cell 12a and the control voltage driving the blower 14, according to the selected operation type. As described above, the default value is used for the balanced type. However, the control values ​​for the energy-saving type and the rapid desorption type may be fixed values ​​or variable values ​​appropriate to each type, similar to the setting process for the adsorption mode execution time.

[0093] In step S720, the control device 17 modifies the detachment learning data based on the control value set in step S710. For example, the control device 17 modifies the detachment learning data according to the difference in magnitude between the normal control value (default value) and the set control value. For example, the detachment learning data can be modified by expanding or contracting the detachment learning data in the time axis direction according to the ratio of the set control value to the normal control value, as shown in Figure 19. As shown in Figure 19, if the energy-saving type is selected as the operation type, the detachment learning data is modified to expand in the time axis direction, and if the rapid detachment type is selected, the detachment learning data is modified to contract in the time axis direction.

[0094] In step S730, the control device 17 stores the corrected detachment learning data in a storage medium such as RAM, disk, or flash memory.

[0095] In step S740, the control device 17 sets the desorption mode execution time based on the desorption learning data. At this time, the control device 17 sets the desorption mode execution time within a range less than or equal to the maximum desorption time in the desorption learning data. This prevents the unnecessary application of the desorption potential, such as continuing to apply the desorption potential even though the desorption of carbon dioxide adsorbed on the electrochemical cell 12a has substantially finished, thereby reducing running costs.

[0096] While preferred embodiments of this disclosure have been described above, this disclosure can be implemented in various ways without being limited to the embodiments described above, and without departing from the spirit of this disclosure.

[0097] For example, in the embodiment described above, an example was explained in which the operating type of the carbon dioxide supply device 10 in the adsorption mode and the operating type of the carbon dioxide supply device 10 in the desorption mode are selected by separate selection conditions. However, the operating type of the carbon dioxide supply device 10 in the adsorption mode and the operating type of the carbon dioxide supply device 10 in the desorption mode may be selected by common selection conditions. In this case, the carbon dioxide supply device 10 will operate with the same operating type in both the adsorption mode and the desorption mode.

[0098] Furthermore, in the above-described embodiment, in both the adsorption mode and the desorption mode, when the operation type of the carbon dioxide supply device 10 is set to the energy-saving type, both the voltage applied to the electrochemical cell 12a and the control voltage of the blower 14 are reduced. However, in the energy-saving operation type, either the voltage applied to the electrochemical cell 12a or the control voltage of the blower 14 may be reduced. Moreover, the energy-saving operation type may be set in two stages, where in the first energy-saving operation type, either the voltage applied to the electrochemical cell 12a or the control voltage of the blower 14 is reduced, and in the second energy-saving operation type, both the voltage applied to the electrochemical cell 12a and the control voltage of the blower 14 are reduced. Similarly, for the rapid adsorption type and rapid desorption type operation types, either the voltage applied to the electrochemical cell 12a or the control voltage of the blower 14 may be increased. Moreover, the rapid adsorption type and rapid desorption type operation types may be set in two stages.

[0099] Furthermore, in the embodiment described above, the control device 17 was configured to perform all the calculation processing necessary to execute a series of control sequences. However, at least some of the processing of the control device 17 may be performed by a processing device other than the control device 17, such as an external server capable of communicating with the control device 17.

[0100] Finally, this specification discloses several technical concepts and several combinations thereof, as listed below.

[0101] (Technical thought 1) A carbon dioxide supply device having an electrochemical cell (12a) arranged inside a housing that adsorbs carbon dioxide by applying an adsorption potential and desorbs the adsorbed carbon dioxide by applying a desorption potential, and which supplies carbon dioxide desorbed from the electrochemical cell to a carbon dioxide supply target (16) by alternately performing an adsorption mode in which carbon dioxide is adsorbed onto the electrochemical cell and a desorption mode in which carbon dioxide is desorbed from the electrochemical cell, A carbon dioxide sensor (12b) for measuring the carbon dioxide concentration inside the housing, With the enclosure sealed, a desorption potential is applied to the electrochemical cell adsorbing carbon dioxide, and the change in carbon dioxide concentration inside the enclosure over time is measured using the carbon dioxide sensor in the desorption data measurement unit (S400~S440), The system includes a desorption learning data generation unit (S450) that generates desorption learning data representing the relationship between elapsed time and the amount of carbon dioxide desorbed from the electrochemical cell, based on the change in carbon dioxide concentration inside the housing over time, as measured by the desorption data measurement unit, A carbon dioxide supply device in which the application time of the desorption potential in the desorption mode is set based on the desorption learning data.

[0102] (Technical thought 2) A blower (14) that sends air containing carbon dioxide into the aforementioned enclosure, The carbon dioxide supply device according to technical concept 1 further comprises a pre-learning preparation unit (S300~S330) which, while supplying air containing carbon dioxide into the housing with the blower, applies an adsorption potential to the electrochemical cell, thereby causing the electrochemical cell to be in a state of adsorbing carbon dioxide before measurement by the desorption data measurement unit.

[0103] (Technical Thought 3) The carbon dioxide supply device according to technical concept 2, wherein the pre-learning preparation unit adsorbs carbon dioxide onto the electrochemical cell until a predetermined estimated time has elapsed in which it is estimated that an amount of carbon dioxide equivalent to the maximum adsorption amount of the electrochemical cell has been adsorbed onto the electrochemical cell, or until the concentration change downstream of the electrochemical cell, as measured by the carbon dioxide sensor, indicates the adsorption of the maximum adsorption amount of the electrochemical cell.

[0104] (Technical Thought 4) When carbon dioxide desorbed from the electrochemical cell after measurement by the desorption data measurement unit is present in the housing, the adsorption data measurement unit (S500~S540) applies an adsorption potential to the electrochemical cell while maintaining a sealed state inside the housing, and measures the change in carbon dioxide concentration inside the housing over time using the carbon dioxide sensor, The system further comprises an adsorption learning data generation unit (S550) that generates adsorption learning data representing the relationship between elapsed time and the amount of carbon dioxide adsorbed by the electrochemical cell, based on the change in carbon dioxide concentration inside the housing over time, as measured by the adsorption data measurement unit, A carbon dioxide supply device according to any one of technical ideas 1 to 3, wherein the application time of the adsorption potential in the adsorption mode is set based on the adsorption learning data.

[0105] (Technical Thought 5) The carbon dioxide supply device according to any one of technical ideas 1 to 4, wherein the desorption data measuring unit measures the change in carbon dioxide concentration over time until the change in carbon dioxide concentration over time falls below a predetermined value, or until the carbon dioxide concentration inside the housing rises to a value indicating the completion of desorption of carbon dioxide from the electrochemical cell.

[0106] (Technical Thought 6) A carbon dioxide supply device according to technical concept 2 or 3, further comprising a desorption learning data modification unit (S710, S720) that modifies the desorption learning data so as to change the elapsed time with respect to the amount of carbon dioxide desorbed, in accordance with at least one of the airflow rate of the blower and the difference between the desorption potential applied to the electrochemical cell in the desorption mode and the desorption potential measured by the desorption data measurement unit, when setting the application time of the desorption potential in the desorption mode based on the desorption learning data.

[0107] (Technical Thought 7) The carbon dioxide supply device according to any one of Technical Ideas 1 to 6, wherein the generation of the desorption learning data is performed in accordance with at least one of the following: when requested by the user, when the carbon dioxide supply device starts operation, during the shutdown period of the carbon dioxide supply device, when the operating time or number of operations of the carbon dioxide supply device reaches a predetermined value, after maintenance or replacement of the electrochemical cell, and when it is a learning timing according to the weather, region, and season.

[0108] (Technical Thought 8) A carbon dioxide supply device having an electrochemical cell (12a) arranged inside a housing that adsorbs carbon dioxide by applying an adsorption potential and desorbs the adsorbed carbon dioxide by applying a desorption potential, and which supplies carbon dioxide desorbed from the electrochemical cell to a target for carbon dioxide supply by alternately performing an adsorption mode in which carbon dioxide is adsorbed onto the electrochemical cell and a desorption mode in which carbon dioxide is desorbed from the electrochemical cell, A carbon dioxide sensor (12b) for measuring the carbon dioxide concentration inside the housing, The adsorption data measurement unit (S500~S540) applies an adsorption potential to the electrochemical cell while the enclosure is sealed and the carbon dioxide concentration inside the enclosure is higher than the carbon dioxide concentration in the atmosphere, and measures the change in the carbon dioxide concentration inside the enclosure over time using the carbon dioxide sensor, The system includes an adsorption learning data generation unit (S550~S570) that generates adsorption learning data representing the relationship between elapsed time and the amount of carbon dioxide adsorbed by the electrochemical cell, based on the change in carbon dioxide concentration inside the housing over time, as measured by the adsorption data measurement unit, A carbon dioxide supply device in which the application time of the adsorption potential in the adsorption mode is set based on the adsorption learning data.

[0109] (Technical Thought 9) Prior to measurement by the adsorption data measurement unit, the desorption data measurement unit (S400~S440) applies a desorption potential to the electrochemical cell adsorbing carbon dioxide while the inside of the housing is sealed, and measures the change in carbon dioxide concentration inside the housing over time using the carbon dioxide sensor. The system further includes a desorption learning data generation unit (S450) that generates desorption learning data representing the relationship between elapsed time and the amount of carbon dioxide desorbed from the electrochemical cell, based on the change in carbon dioxide concentration inside the housing over time, as measured by the desorption data measurement unit, A carbon dioxide supply device according to technical concept 8, wherein the application time of the desorption potential in the desorption mode is set based on the desorption learning data.

[0110] (Technical Thought 10) A blower (14) that sends atmospheric gas containing carbon dioxide into the aforementioned enclosure, The carbon dioxide supply device according to technical concept 9 further comprises a pre-learning preparation unit (S300~S330) which, while supplying atmospheric gas containing carbon dioxide into the housing with the blower, applies an adsorption potential to the electrochemical cell, thereby causing the electrochemical cell to be in a state of adsorbing carbon dioxide before measurement by the desorption data measurement unit.

[0111] (Technical Thought 11) The carbon dioxide supply device according to technical concept 10, wherein the pre-learning preparation unit adsorbs carbon dioxide onto the electrochemical cell until an estimated time has elapsed in which it is estimated that an amount of carbon dioxide equivalent to the maximum adsorption amount of the electrochemical cell has been adsorbed onto the electrochemical cell, or until the concentration change downstream of the electrochemical cell, as measured by the carbon dioxide sensor, indicates the adsorption of the maximum adsorption amount of the electrochemical cell.

[0112] (Technical Thought 12) The carbon dioxide supply device according to any one of technical ideas 8 to 11, wherein the adsorption data measurement unit measures the change in carbon dioxide concentration over time until the change in carbon dioxide concentration over time falls below a predetermined value, or until the carbon dioxide concentration inside the housing decreases to a value indicating the completion of carbon dioxide adsorption to the electrochemical cell.

[0113] (Technical Thought 13) The adsorption data measurement unit measures the change in carbon dioxide concentration over time until the change in carbon dioxide concentration over time falls below a predetermined value, or until the carbon dioxide concentration inside the housing decreases to a value indicating the completion of carbon dioxide adsorption to the electrochemical cell. The carbon dioxide supply device according to technical concept 11, wherein the adsorption learning data generation unit updates the adsorption learning data by changing the elapsed time relative to the amount of carbon dioxide adsorbed according to the difference between the adsorption time of carbon dioxide by the pre-learning preparation unit and the measurement time by the adsorption data measurement unit.

[0114] (Technical Thought 14) A carbon dioxide supply device according to any one of technical ideas 10, 11, and 13, further comprising an adsorption learning data modification unit (S610, S620) that modifies the adsorption learning data so as to change the elapsed time for the amount of carbon dioxide adsorbed, in accordance with at least one of the airflow rate of the blower and the difference between the adsorption potential applied to the electrochemical cell in the adsorption mode and the adsorption potential measured by the adsorption data measurement unit, when setting the application time of the adsorption potential in the adsorption mode based on the adsorption learning data.

[0115] (Technical Thought 15) The carbon dioxide supply device according to any one of Technical Ideas 8 to 14, wherein the generation of the adsorption learning data is performed in accordance with at least one of the following: when requested by the user, when the carbon dioxide supply device starts operation, during the shutdown period of the carbon dioxide supply device, when the operating time or number of operations of the carbon dioxide supply device reaches a predetermined value, after maintenance or replacement of the electrochemical cell, and when it is a learning timing according to the weather, region, or season.

[0116] (Technical Thought 16) A carbon dioxide supply device according to any one of technical ideas 1 to 15, wherein the adsorption mode and the desorption mode are repeatedly performed until the carbon dioxide concentration in the carbon dioxide supply target reaches a target concentration. [Explanation of Symbols]

[0117] 10: Carbon dioxide supply device, 11: First shut-off valve, 12: Recovery unit, 12a: Electrochemical cell, 12b: Carbon dioxide sensor, 13: Second shut-off valve, 14: Blower, 15: Flow path switching valve, 16: Carbon dioxide supply destination, 16a: Carbon dioxide sensor, 17: Control device

Claims

1. A carbon dioxide supply device having an electrochemical cell (12a) arranged inside a housing that adsorbs carbon dioxide by applying an adsorption potential and desorbs the adsorbed carbon dioxide by applying a desorption potential, and which supplies carbon dioxide desorbed from the electrochemical cell to a carbon dioxide supply target (16) by alternately performing an adsorption mode in which carbon dioxide is adsorbed onto the electrochemical cell and a desorption mode in which carbon dioxide is desorbed from the electrochemical cell, A carbon dioxide sensor (12b) for measuring the carbon dioxide concentration inside the housing, With the enclosure sealed, a desorption data measurement unit (S400-S440) applies a desorption potential to the electrochemical cell adsorbing carbon dioxide and measures the change in carbon dioxide concentration inside the enclosure over time using the carbon dioxide sensor. The system includes a desorption learning data generation unit (S450) that generates desorption learning data representing the relationship between elapsed time and the amount of carbon dioxide desorbed from the electrochemical cell, based on the change in carbon dioxide concentration inside the housing over time, as measured by the desorption data measurement unit, A carbon dioxide supply device in which the application time of the desorption potential in the desorption mode is set within a range less than or equal to the maximum desorption time in the desorption learning data.

2. A blower (14) that sends air containing carbon dioxide into the enclosure, The carbon dioxide supply device according to claim 1, further comprising: a pre-learning preparation unit (S300 to S330) which, while supplying air containing carbon dioxide into the housing with the blower, applies an adsorption potential to the electrochemical cell, thereby causing the electrochemical cell to be in a state of adsorbing carbon dioxide before measurement by the desorption data measurement unit.

3. The carbon dioxide supply device according to claim 2, wherein the pre-learning preparation unit causes carbon dioxide to adsorb onto the electrochemical cell until a predetermined estimated time has elapsed in which it is estimated that an amount of carbon dioxide equivalent to the maximum adsorption amount of the electrochemical cell has been adsorbed onto the electrochemical cell, or until the concentration change downstream of the electrochemical cell, as measured by the carbon dioxide sensor, indicates the adsorption of the maximum adsorption amount of the electrochemical cell.

4. When carbon dioxide desorbed from the electrochemical cell after measurement by the desorption data measurement unit is present in the housing, the adsorption data measurement unit (S500 to S540) applies an adsorption potential to the electrochemical cell while maintaining a sealed state inside the housing, and measures the change in carbon dioxide concentration inside the housing over time using the carbon dioxide sensor. The system further comprises an adsorption learning data generation unit (S550) that generates adsorption learning data representing the relationship between elapsed time and the amount of carbon dioxide adsorbed by the electrochemical cell, based on the change in carbon dioxide concentration inside the housing over time, as measured by the adsorption data measurement unit, The carbon dioxide supply device according to any one of claims 1 to 3, wherein the application time of the adsorption potential in the adsorption mode is set based on the adsorption learning data.

5. The carbon dioxide supply device according to any one of claims 1 to 3, wherein the desorption data measuring unit measures the change in carbon dioxide concentration over time until the change in carbon dioxide concentration over time falls below a predetermined value, or until the carbon dioxide concentration inside the housing rises to a value indicating the completion of desorption of carbon dioxide from the electrochemical cell.

6. The carbon dioxide supply device according to claim 2 or 3, further comprising a desorption learning data modification unit (S710, S720) that modifies the desorption learning data so as to change the elapsed time with respect to the amount of carbon dioxide desorbed, in accordance with at least one of the magnitude of the control voltage that drives the blower and the magnitude of the desorption potential applied to the electrochemical cell, when setting the application time of the desorption potential in the desorption mode based on the desorption learning data.

7. The carbon dioxide supply device according to any one of claims 1 to 3, wherein the generation of the desorption learning data is performed in accordance with at least one of the following: when requested by the user, when the carbon dioxide supply device starts operation, during the shutdown period of the carbon dioxide supply device, when the operating time or number of operations of the carbon dioxide supply device reaches a predetermined value, after maintenance or replacement of the electrochemical cell, and when it is a learning timing according to the weather, region, and season.

8. A carbon dioxide supply device having an electrochemical cell (12a) arranged inside a housing that adsorbs carbon dioxide by applying an adsorption potential and desorbs the adsorbed carbon dioxide by applying a desorption potential, and which supplies carbon dioxide desorbed from the electrochemical cell to a target for carbon dioxide supply by alternately performing an adsorption mode in which carbon dioxide is adsorbed onto the electrochemical cell and a desorption mode in which carbon dioxide is desorbed from the electrochemical cell, A carbon dioxide sensor (12b) for measuring the carbon dioxide concentration inside the housing, The adsorption data measurement unit (S500-S540) applies an adsorption potential to the electrochemical cell while the enclosure is sealed and the carbon dioxide concentration inside the enclosure is higher than the carbon dioxide concentration in the atmosphere, and measures the change in the carbon dioxide concentration inside the enclosure over time using the carbon dioxide sensor. The system includes an adsorption learning data generation unit (S550 to S570) that generates adsorption learning data representing the relationship between elapsed time and the amount of carbon dioxide adsorbed by the electrochemical cell, based on the change in carbon dioxide concentration inside the housing over time, as measured by the adsorption data measurement unit, A carbon dioxide supply device in which the application time of the adsorption potential in the adsorption mode is set within a range less than or equal to the maximum adsorption time in the adsorption learning data.

9. Prior to measurement by the adsorption data measurement unit, the desorption data measurement unit (S400-S440) applies a desorption potential to the electrochemical cell adsorbing carbon dioxide while the inside of the housing is sealed, and measures the change in carbon dioxide concentration inside the housing over time using the carbon dioxide sensor. The system further includes a desorption learning data generation unit (S450) that generates desorption learning data representing the relationship between elapsed time and the amount of carbon dioxide desorbed from the electrochemical cell, based on the change in carbon dioxide concentration inside the housing over time, as measured by the desorption data measurement unit, The carbon dioxide supply device according to claim 8, wherein the application time of the desorption potential in the desorption mode is set based on the desorption learning data.

10. A blower (14) that sends air containing carbon dioxide into the enclosure, The carbon dioxide supply device according to claim 9, further comprising: a pre-learning preparation unit (S300 to S330) which, while supplying air containing carbon dioxide into the housing with the blower, applies an adsorption potential to the electrochemical cell, thereby causing the electrochemical cell to be in a state of adsorbing carbon dioxide before measurement by the desorption data measurement unit.

11. The carbon dioxide supply device according to claim 10, wherein the pre-learning preparation unit causes carbon dioxide to adsorb onto the electrochemical cell until an estimated time has elapsed in which it is estimated that an amount of carbon dioxide equivalent to the maximum adsorption amount of the electrochemical cell has been adsorbed onto the electrochemical cell, or until the concentration change downstream of the electrochemical cell, as measured by the carbon dioxide sensor, indicates the adsorption of the maximum adsorption amount of the electrochemical cell.

12. The carbon dioxide supply device according to any one of claims 8 to 11, wherein the adsorption data measurement unit measures the change in carbon dioxide concentration over time until the change in carbon dioxide concentration over time falls below a predetermined value, or until the carbon dioxide concentration inside the housing decreases to a value indicating the completion of adsorption of carbon dioxide to the electrochemical cell.

13. The adsorption data measurement unit measures the change in carbon dioxide concentration over time until the change in carbon dioxide concentration over time falls below a predetermined value, or until the carbon dioxide concentration inside the housing decreases to a value indicating the completion of carbon dioxide adsorption to the electrochemical cell. The carbon dioxide supply device according to claim 11, wherein the adsorption learning data generation unit updates the adsorption learning data by changing the elapsed time relative to the amount of carbon dioxide adsorbed according to the difference between the adsorption time of carbon dioxide by the pre-learning preparation unit and the measurement time by the adsorption data measurement unit.

14. The carbon dioxide supply device according to any one of claims 10, 11, and 13, further comprising an adsorption learning data modification unit (S610, S620) that modifies the adsorption learning data so as to change the elapsed time with respect to the amount of carbon dioxide adsorbed, in accordance with at least one of the magnitude of the control voltage that drives the blower and the magnitude of the adsorption potential applied to the electrochemical cell, when setting the application time of the adsorption potential in the adsorption mode based on the adsorption learning data.

15. The carbon dioxide supply device according to any one of claims 8 to 11, wherein the generation of the adsorption learning data is performed in accordance with at least one of the following: when requested by the user, when the carbon dioxide supply device starts operation, during the shutdown period of the carbon dioxide supply device, when the operating time or number of operations of the carbon dioxide supply device reaches a predetermined value, after maintenance or replacement of the electrochemical cell, and when it is a learning timing according to the weather, region, and season.

16. The carbon dioxide supply device according to any one of claims 1 to 3, 8 to 11, wherein the adsorption mode and the desorption mode are repeated until the carbon dioxide concentration in the carbon dioxide supply target reaches a target concentration.

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