JP6718419B2 - Carbon dioxide application equipment - Google Patents

Description

The present disclosure relates to carbon dioxide application devices.

Carbon dioxide application devices are known for applying carbon dioxide to agricultural greenhouses in order to improve the yield and quality of horticultural plants. On the other hand, the agricultural house is equipped with a warmer to prevent the temperature from dropping at night. The warmer burns heavy oil, kerosene, or the like to supply hot air to the agricultural house.

Therefore, a carbon dioxide application device has been devised in which carbon dioxide in combustion exhaust gas generated from a warmer at night is stored by an adsorbent, and the stored carbon dioxide is supplied into an agricultural greenhouse during the daytime (Patent Document 1).

JP, 2005-142531, A

However, for example, when the operating rate of the warmer at night is low, a sufficient amount of carbon dioxide is not stored in the adsorbent of the carbon dioxide application device. Therefore, it becomes difficult to supply sufficient carbon dioxide into the agricultural greenhouse during the daytime.

One aspect of the present disclosure aims to appropriately supply carbon dioxide into an agricultural greenhouse.

One aspect of the present disclosure is a carbon dioxide application device as a main application device configured to supply carbon dioxide contained in combustion exhaust gas into an agricultural greenhouse. The carbon dioxide application device includes an adsorption tank, a device, a supply control unit, and a concentration detection unit. The adsorption tank has therein an adsorbent configured to adsorb carbon dioxide in the combustion exhaust gas. Further, the device is provided in the carbon dioxide supply flow path and is configured to flow down the gas in the carbon dioxide supply flow path. Further, the supply control unit is configured to supply the carbon dioxide adsorbed by the adsorbent in the adsorption tank into the agricultural house by the device via the carbon dioxide supply passage. Further, the concentration detection unit is configured to measure or estimate the concentration of carbon dioxide supplied from the adsorption tank into the agricultural greenhouse. Then, the supply control unit supplies carbon dioxide when the concentration of carbon dioxide measured or estimated by the concentration detection unit falls below a predetermined threshold value while supplying carbon dioxide from the adsorption tank into the agricultural house. The device is configured to supply carbon dioxide from the auxiliary application device into the agricultural house through the flow path.

According to such a configuration, when the residual amount of carbon dioxide stored in the adsorption tank is reduced and it becomes impossible to supply a sufficient amount of carbon dioxide from the adsorption tank into the agricultural house, the auxiliary application device is used. Carbon dioxide is supplied into the agricultural house. Therefore, even if a sufficient amount of carbon dioxide is not stored in the adsorption tank, a sufficient amount of carbon dioxide can be supplied into the agricultural house.

Therefore, carbon dioxide can be appropriately supplied into the agricultural house.
The supply control unit, while supplying carbon dioxide from the auxiliary application device into the agricultural house, the concentration of carbon dioxide measured or estimated by the concentration detection unit is a threshold value that is set separately from the threshold value described above. Above, the supply of carbon dioxide from the auxiliary application device may be stopped.

According to such a configuration, as a result of supplying carbon dioxide from the auxiliary application device into the agricultural house, when the inside of the agricultural house reaches an appropriate carbon dioxide concentration, the supply of carbon dioxide from the auxiliary application device is stopped. It Therefore, it is possible to suppress excessive operation of the auxiliary application device and maintain the carbon dioxide in the agricultural house at an appropriate concentration.

In addition, the auxiliary application device may be configured as a device that heats the inside of the agricultural house while generating carbon dioxide by burning the fuel.
With such a configuration, it is possible to effectively use energy.

The auxiliary application device may also be configured as a cylinder that stores carbon dioxide. The supply control unit may be configured to supply the carbon dioxide released from the auxiliary application device diluted with air into the agricultural house.

With such a configuration, it is possible to suppress the local supply of carbon dioxide into the agricultural house or to supply the carbon dioxide having an appropriate concentration into the agricultural house.

FIG. 1 is a block diagram schematically showing the configuration of the carbon dioxide application device in the present embodiment. FIG. 2 is a flowchart of the CO2 supply process. FIG. 3 is a graph showing changes in the carbon dioxide concentration in the agricultural house. FIG. 4 is a graph showing changes in the concentration of carbon dioxide in the flow path of the carbon dioxide application device.

Hereinafter, embodiments to which the present disclosure is applied will be described with reference to the drawings.
[1. Constitution]
The carbon dioxide application device 1 shown in FIG. 1 is a device as a main application device for supplying the carbon dioxide contained in the combustion exhaust gas into the agricultural house 100. The carbon dioxide application device 1 is arranged inside or outside the agricultural house 100. The carbon dioxide application device 1 includes a combustion device 2, a first liquid storage tank 3, a second liquid storage tank 4, a blower 5, an adsorption tank 6, a control unit 7, a purification unit 8, and an auxiliary application device. 9 and.

Further, the carbon dioxide application device 1 is provided with a flow path for flowing down the combustion exhaust gas and flowing down the carbon dioxide toward the inside of the agricultural house 100. Specifically, the carbon dioxide application device 1 includes an exhaust gas flow channel 10, a first intake flow channel 11, a cooling air flow channel 12, a second intake flow channel 13, and an applied air flow channel 14. The in-house flow path 15, the auxiliary flow path 16, the out-house flow path 17, and the first to third tank flow paths 18 to 20 are provided. Further, the carbon dioxide application apparatus 1 includes a plurality of open/close valves 12A, 14A, 15A, 15B, 16A, 17A, 17B for opening/closing the flow paths.

<Combustion device>
The combustion device 2 is a device that mainly burns fuel such as heavy oil and kerosene at night to warm the air in the agricultural house 100. The combustion exhaust gas is discharged through the exhaust gas passage 10 which is a chimney.

<First and second liquid storage tanks>
The first and second liquid storage tanks 3 and 4 are devices that store liquid therein and that cool and purify a part of the combustion exhaust gas generated from the combustion device 2 with the liquid.

The combustion exhaust gas generated in the combustion device 2 flows into the first liquid storage tank 3 through the first intake passage 11, and the combustion exhaust gas that has passed through the first liquid storage tank 3 is included in the second intake passage 13 Through the second liquid storage tank 4. Then, the combustion exhaust gas that has passed through the second liquid storage tank 4 flows into the in-house flow path 15.

Each of the first and second liquid storage tanks 3 and 4 is configured so that the combustion exhaust gas that has flowed into the tank passes through the liquid inside the tank. In the first and second liquid storage tanks 3 and 4, the combustion exhaust gas is cooled by heat exchange with the liquid, and a part of the components contained in the combustion exhaust gas is removed by the compound contained in the liquid. That is, the carbon dioxide application device 1 cools and purifies the combustion exhaust gas in two stages by the first and second liquid storage tanks 3 and 4.

The liquid stored in the first and second liquid storage tanks 3 and 4 is preferably one capable of removing harmful substances such as sulfides and nitrides contained in the combustion exhaust gas. For example, an aqueous solution of a compound that reacts with a sulfide or a nitride can be preferably used as the liquid.

Further, a cooling air flow path 12 for cooling the stored liquid is connected to the first liquid storage tank 3. The cooling air flow passage 12 cools the liquid by supplying the cooling air into the liquid. The cooling air flow path 12 has an opening/closing valve 12A. The on-off valve 12A is opened when the cooling air is supplied into the liquid, and in other cases, the on-off valve 12A is closed.

<Blower>
The blower 5 is a device that is provided in the in-house flow path 15 and configured to flow gas in the in-house flow path 15. The blower 5 supplies the combustion exhaust gas to the adsorption tank 6 via the flow path, or supplies carbon dioxide from the adsorption tank 6 or the auxiliary application device 9 into the agricultural house 100. In addition, one end of the in-house flow path 15 is disposed in the agricultural house 100. An out-of-house flow path 17 is branched from the in-house flow path 15, and one end of the out-house flow path 17 is disposed outside the agricultural house 100.

By the operation of the blower 5, gas such as combustion exhaust gas in the in-house flow path 15 is pressure-fed toward the agricultural house 100 and the out-of-house flow path 17. Hereinafter, the side to which the gas sent by the blower 5 is directed is referred to as the downstream side. Moreover, the opposite side of the downstream side is described as the upstream side.

<Adsorption tank>
The adsorption tank 6 has therein an adsorbent that adsorbs carbon dioxide in the combustion exhaust gas. As the adsorbent, for example, a porous material such as activated carbon or zeolite can be used. The adsorption tank 6 is connected to the first tank flow path 18 branched from the external house flow path 17. Further, the adsorption tank 6 is connected to the purification unit 8 via the second tank flow path 19.

In the carbon dioxide adsorption step described later, when the combustion exhaust gas passes through the adsorption tank 6, the carbon dioxide in the combustion exhaust gas is adsorbed by the adsorbent. On the other hand, in the carbon dioxide application step described below, the application air passes through the adsorption tank 6 to desorb carbon dioxide from the adsorbent. The desorbed carbon dioxide is applied to the agricultural house 100.

<Purification section>
The purification unit 8 is a device that removes harmful substances (eg, sulfur oxides, nitrogen oxides, etc.) that adversely affect the growth of plants from the combustion exhaust gas. Specifically, for example, the purifying unit 8 may have a filter or the like containing granular activated carbon. Then, the purifying unit 8 may remove the harmful substance by causing the granular activated carbon to adsorb the harmful substance contained in the combustion exhaust gas passing through the purifying unit 8. The purifying unit 8 is connected to the third tank flow path 20 that branches from the downstream side of the branch point of the in-house flow path 15 and the out-house flow path 17.

<Auxiliary application device>
The auxiliary application device 9 is a device that supplies carbon dioxide into the agricultural house 100 when carbon dioxide cannot be sufficiently supplied from the adsorption tank 6 in the carbon dioxide application process. The carbon dioxide application device 1 may be configured by using, as the auxiliary application device 9, a device that has been conventionally used for applying carbon dioxide into the agricultural house 100.

The auxiliary application device 9 may be configured, for example, as a combustion device that generates carbon dioxide by burning a fuel such as kerosene. Further, the auxiliary application device 9 may be configured as, for example, a carbon dioxide cylinder that stores high-pressure carbon dioxide. The carbon dioxide supplied from the auxiliary application device 9 flows into the upstream side of the blower 5 in the in-house flow path 15 via the auxiliary flow path 16.

<Multiple on-off valves>
The cooling air flow passage 12, the application air flow passage 14, and the auxiliary flow passage 16 are provided with open/close valves 12A, 14A, 16A, respectively. The applied air flow path 14 is a flow path branched from the upstream side of the blower 5 in the in-house flow path 15, and one end thereof is arranged outside the agricultural house 100.

Further, the in-house flow passage 15 is provided with first and second opening/closing valves 15A and 15B. The first opening/closing valve 15A is located on the upstream side of the branch point of the third tank flow path 20 and on the downstream side of the branch point of the outside-house flow path 17. The second on-off valve 15B is located downstream of the branch point of the third tank flow path 20.

Further, the outside-house flow passage 17 is provided with first and second opening/closing valves 17A and 17B. The first opening/closing valve 17A is located upstream of the branch point of the first tank flow path 18, and the second opening/closing valve 17B is located downstream of the branch point.

<Control part>
The control unit 7 is a device that controls the carbon dioxide application device 1. The control unit 7 may be composed of, for example, a computer or the like. Specifically, the control unit 7 controls the operation and stop of the blower 5 and the opening and closing of each on-off valve provided in the flow path. Further, the control unit 7 receives the measurement signals from the flow passage concentration sensor 15C and the greenhouse concentration sensor 100A.

The channel concentration sensor 15C is a concentration sensor for measuring the concentration of carbon dioxide supplied from the adsorption tank 6 in the channel. The concentration sensor 15C in the flow path is provided, for example, on the downstream side of the second opening/closing valve 17B in the flow path 15 in the house. On the other hand, the in-house concentration sensor 100A is a concentration sensor for measuring the concentration of carbon dioxide in the agricultural house 100. The in-house concentration sensor 100A is provided in the agricultural house 100.

[2. processing]
The carbon dioxide application device 1 performs processing for realizing an adsorption step of recovering carbon dioxide from combustion exhaust gas and an application step of supplying carbon dioxide into the agricultural house 100.

<Adsorption process>
The adsorption step is mainly performed by operating the blower 5 during combustion in the combustion device 2 at night. The combustion of the combustion device 2 may be started by the control unit 7. In the adsorption step, the open/close valve 12A of the cooling air flow path 12, the open/close valve 14A of the application air flow path 14, the open/close valve 16A of the auxiliary flow path 16, the second open/close valve 15B of the in-house flow path 15, and the out-house flow path. The first opening/closing valve 17A of 17 is closed, and the first opening/closing valve 15A of the in-house flow path 15 and the second opening/closing valve 17B of the out-house flow path 17 are opened.

Therefore, the combustion exhaust gas generated in the combustion device 2 sequentially passes through the purification unit 8 and the adsorption tank 6 by the operation of the blower 5, and flows out of the agricultural house 100. When the combustion exhaust gas passes through the purification unit 8, harmful substances are removed from the combustion exhaust gas. Further, when the combustion exhaust gas passes through the adsorption tank 6, the carbon dioxide contained in the combustion exhaust gas is adsorbed by the adsorbent.

<Application process>
The application process is performed in order to supply carbon dioxide into the agricultural house 100 during the daytime. The application process has a main mode, a sub mode, and a stop mode. Carbon dioxide is supplied from the adsorption tank 6 in the main mode, and carbon dioxide is supplied from the auxiliary application device 9 in the sub mode. The main and sub modes are executed by operating the blower 5. Further, in the stop mode, the blower 5 is stopped and the supply of carbon dioxide into the agricultural house 100 is stopped.

In the main mode, the opening/closing valve 12A of the cooling air flow path 12, the opening/closing valve 16A of the auxiliary flow path 16, the first opening/closing valve 15A of the in-house flow path 15, and the second opening/closing valve 17B of the out-house flow path 17 are closed. The opening/closing valve 14A of the application air flow path 14, the second opening/closing valve 15B of the in-house flow path 15, and the first opening/closing valve 17A of the out-house flow path 17 are opened.

Therefore, the operation of the blower 5 causes the application air to flow in from the application air flow path 14 and is pumped into the agricultural house 100. Specifically, the applied air sequentially passes through the adsorption tank 6 and the purification unit 8 and flows into the agricultural house 100. When the application air passes through the adsorption tank 6, carbon dioxide adsorbed on the adsorbent flows out, and the outflowing carbon dioxide flows into the agricultural house 100 together with the application air.

On the other hand, in the sub mode, for example, when the auxiliary application device 9 is configured as a combustion device, the control unit 7 starts the combustion of the auxiliary application device 9 at the time of or before the transition to the sub mode, for example. Let Further, the open/close valve 12A of the cooling air flow path 12, the open/close valve 14A of the application air flow path 14, and the first and second open/close valves 17A and 17B of the outside-house flow path 17 are closed, and the open/close valve of the auxiliary flow path 16 is closed. 16A and the first and second on-off valves 15A and 15B of the in-house flow path 15 are opened.

Therefore, by operating the blower 5, the carbon dioxide supplied from the auxiliary application device 9 is pressure-fed into the agricultural house 100. Specifically, the carbon dioxide sequentially passes through the auxiliary flow path 16 and the in-house flow path 15 and flows into the agricultural house 100.

In addition, for example, when the auxiliary application device 9 is configured as a carbon dioxide cylinder, the control unit 7 opens the valve of the carbon dioxide cylinder when shifting to the sub mode. Further, the opening/closing valve 12A of the cooling air flow path 12 and the first and second opening/closing valves 17A, 17B of the outside-house flow path 17 are closed, and the opening/closing valve 14A of the application air flow path 14 and the opening/closing valve of the auxiliary flow path 16 are closed. 16A and the first and second on-off valves 15A and 15B of the in-house flow path 15 are opened.

Therefore, by the operation of the blower 5, the application air flowing in from the application air flow path 14 and the carbon dioxide supplied from the auxiliary application device 9 are pressure-fed into the agricultural house 100. Specifically, the carbon dioxide is diluted to a suitable concentration by the application air, passes through the in-house flow path 15, and flows into the agricultural house 100. Thereby, it becomes possible to suppress the local supply of carbon dioxide into the agricultural house 100 or to supply the carbon dioxide having an appropriate concentration into the agricultural house 100.

<CO2 supply process>
The control unit 7 periodically starts the CO2 supply process of FIG. 2 in the application process. As a result, the processing of each mode described above is realized. Although the main mode flag is used in the supply process, the main mode flag is set to 0 when the carbon dioxide application device 1 is reset.

In S200, the concentration of carbon dioxide in the agricultural greenhouse 100 (hereinafter, greenhouse concentration) is measured or estimated based on the measurement signal from the greenhouse concentration sensor 100A. Instead of the in-house concentration sensor 100A, the in-house concentration may be measured or estimated based on the measurement signal from the in-house concentration sensor 15C. When the concentration in the house is equal to or lower than the first threshold value (500 ppm as an example) (S200: Yes), the process proceeds to S205. On the other hand, if not (S200: No), the process proceeds to S240.

In S205, it is determined whether or not the main mode flag is 1. If the determination is affirmative (S205: Yes), the process proceeds to S220, and if the determination is negative (S205: No), the process proceeds to S210.

In S210, the main mode is started. That is, the supply of carbon dioxide from the adsorption tank 6 into the agricultural house 100 is started. Then, in subsequent S215, 1 is set to the main mode flag, and thereafter, this processing ends.

In S220, it is determined whether t seconds (for example, 10 seconds) have elapsed since the start of the main mode. If the determination is affirmative (S220: Yes), the process proceeds to S225, and if the determination is negative (S220: No), the process proceeds to S235.

On the other hand, in S225, the concentration of carbon dioxide (hereinafter, the concentration in the flow channel) at the downstream side of the second opening/closing valve 15B in the flow channel 15 in the house is measured based on the measurement signal from the concentration sensor 15C in the flow channel. The concentration of carbon dioxide supplied from the adsorption tank 6 into the agricultural house 100 (hereinafter referred to as the supply concentration) is measured or estimated based on the concentration in the flow path. Note that the supply concentration may be measured or estimated based on the measurement signal from the in-house concentration sensor 100A instead of the in-channel concentration sensor 15C. Then, it is determined whether the measured or estimated supply concentration is below a predetermined threshold value. Specifically, when the concentration in the flow path is equal to or lower than the second threshold value (1.0% as an example) (S225: Yes), the process proceeds to S230. In addition, when the concentration in the flow path is the second threshold value, the concentration in the house can be, for example, 300 ppm or less. On the other hand, when the concentration in the flow path is higher than the second threshold value (S225: No), the process proceeds to S235.

Here, the second threshold is a value lower than the first threshold. It is also conceivable to measure or estimate the supply concentration from the adsorption tank 6 based on the concentration in the house instead of the concentration in the flow path. However, compared to the change in the supply concentration being reflected in the flow channel concentration, there is a larger delay before the decrease in the supply concentration is reflected in the greenhouse concentration. In order to measure or estimate the supply concentration more quickly, the supply concentration is measured or estimated based on the concentration in the flow path.

In S230, the sub mode is started. That is, the supply of carbon dioxide from the auxiliary application device 9 into the agricultural house 100 is started. Then, this process ends. In addition, when the auxiliary application device 9 is configured as a combustion device, the blower 5 is operated after a predetermined delay period (30 seconds as an example) has elapsed after the combustion of the auxiliary application device 9 is started at the time of shifting to the sub mode. May be started. Further, the opening/closing valve 14A of the application air flow path 14 may be opened during this delay period. As a result, carbon monoxide generated at the start of combustion of the auxiliary application device 9 is released into the atmosphere, and the carbon monoxide can be suppressed from flowing into the agricultural house 100.

On the other hand, in S235, the main mode is continued, and this processing ends.
On the other hand, in S240, which is performed when the in-house concentration is higher than the first threshold value, the stop mode is started. That is, the supply of carbon dioxide from the adsorption tank 6 and the auxiliary application device 9 is stopped. Specifically, the blower 5 is stopped. Further, for example, when the auxiliary application device 9 is configured as a combustion device, the combustion of the auxiliary application device 9 may be stopped. Further, for example, when the auxiliary application device 9 is configured as a carbon dioxide cylinder, the valve of the carbon dioxide cylinder is closed. Further, at this time, all of the plurality of on-off valves 12A, 14A, 15A, 15B, 16A, 17A, 17B of the flow path may be closed. Then, in subsequent S245, the main mode flag is set to 0, and this processing ends.

In the application process, the CO2 supply process causes the greenhouse concentration to fluctuate as shown in the graph of FIG. That is, when the greenhouse concentration decreases during the stop mode in which carbon dioxide is not supplied to the agricultural house 100 and the greenhouse concentration becomes the first threshold value or less at time T0, a positive determination is made in S200 of the CO2 supply process. .. Then, in the subsequent S205, the value of the main mode flag is determined.

When the in-house concentration first becomes equal to or lower than the first threshold value in the stop mode, the main mode flag is 0, so the main mode is started in S210, and carbon dioxide is supplied from the adsorption tank 6 into the agricultural house 100. To be done. Then, in subsequent S215, the main mode flag is set to 1.

Further, when the main mode flag is 1 and the in-house concentration is determined to be the first threshold value or less in S200, an affirmative determination is made in S205, the process proceeds to S220, and t seconds after the transition to the main mode. Is determined. When a negative determination is made in S220, the main mode is continued and the value of the main mode flag is maintained at 1. On the other hand, if an affirmative judgment is made in S220, then the flow shifts to S225, where it is judged whether the concentration in the flow path is at or below the second threshold value. When a negative determination is made in S225, the main mode is continued and the value of the main mode flag is maintained at 1. On the other hand, when a positive determination is made in S225, the main mode is switched to the sub mode. At this time as well, the value of the main mode flag is maintained at 1.

In the stop mode, the main mode, and the sub mode, when the in-house concentration exceeds the first threshold value, the stop mode is started in S240, and the main mode flag is set to 0 in S245.

Further, T0, T2, T4, and T6 in FIG. 3 indicate timings when the in-house concentration exceeds the first threshold value and the in-house concentration changes to the first threshold value or less. The main mode is started at these timings. On the contrary, T1, T3, and T5 indicate the timing when the in-house concentration changes from the state where the in-house concentration is equal to or lower than the first threshold value to the state where the in-house concentration exceeds the first threshold value. The stop mode is started at these timings.

Note that the description of the second threshold value in FIG. 3 indicates a standard of the greenhouse concentration when the flow channel concentration reaches the second threshold value. Further, the description of the first threshold value in FIG. 4 indicates a guideline of the concentration in the flow path when the concentration in the house becomes the first threshold value.

After that, it is assumed that the concentration in the house decreases during the stop mode, an affirmative determination is made at S200 at time T6, and the time T7 comes after t seconds have elapsed after the main mode was started at S210. At this time, as shown in FIG. 4, the concentration in the flow channel becomes equal to or lower than the second threshold value, and a positive determination is made in S225. That is, the remaining amount of carbon dioxide stored in the adsorption tank 6 becomes small, and a sufficient amount of carbon dioxide cannot be supplied from the adsorption tank 6. At this time, S230 of the CO2 supply process is executed, and the mode shifts to the sub mode. That is, carbon dioxide is supplied from the auxiliary application device 9 into the agricultural house 100. After that, if the in-house concentration increases and it is determined at S200 that the in-house concentration exceeds the first threshold value at time T8, S240 of the CO2 supply process is executed, and the mode shifts to the stop mode.

When the auxiliary application device 9 is configured as a combustion device, the auxiliary application device 9 may heat the inside of the agricultural house 100. This enables effective use of energy. Further, at this time, the carbon dioxide application device 1 may collect the carbon dioxide generated from the auxiliary application device 9. Specifically, the control unit 7 controls the opening/closing valve 12A of the cooling air flow passage 12, the opening/closing valve 14A of the application air flow passage 14, the second opening/closing valve 15B of the in-house flow passage 15, and the outside-house flow passage 17. Even if the first opening/closing valve 17A is closed and the opening/closing valve 16A of the auxiliary flow path 16, the first opening/closing valve 15A of the in-house flow path 15, and the second opening/closing valve 17B of the out-house flow path 17 are opened. good. Thereby, when the blower 5 is operated, the carbon dioxide supplied from the auxiliary application device 9 is sequentially pressure-fed to the purification section 8 and the adsorption tank 6. Therefore, the carbon dioxide is adsorbed by the adsorbent in the adsorption tank 6.

Further, the carbon dioxide may be recovered while being supplied from the auxiliary application device 9 into the agricultural house 100. That is, the control unit 7 controls the opening/closing valve 12A of the cooling air flow path 12, the opening/closing valve 14A of the application air flow path 14, the first opening/closing valve 15A of the in-house flow path 15, and the second opening/closing of the out-house flow path 17. The opening/closing valve 16A of the auxiliary flow path 16, the second opening/closing valve 15B of the in-house flow path 15, and the first opening/closing valve 17A of the out-house flow path 17 may be opened while closing the valve 17B.

Thereby, when the blower 5 is operated, the carbon dioxide supplied from the auxiliary application device 9 flows into the agricultural house 100 after sequentially passing through the adsorption tank 6 and the purification unit 8. Therefore, carbon dioxide can be adsorbed on the adsorbent in the adsorption tank 6. When the carbon dioxide adsorbed by the adsorbent reaches the maximum capacity, the carbon dioxide passes through the adsorption tank 6 and flows into the agricultural house 100. Therefore, while supplying carbon dioxide from the auxiliary application device 9 into the agricultural house 100, the carbon dioxide can be recovered.

[3. effect]
(1) According to the above-described embodiment, when the remaining amount of carbon dioxide stored in the adsorption tank 6 decreases and it becomes impossible to supply a sufficient amount of carbon dioxide from the adsorption tank 6 into the agricultural house 100, Carbon dioxide is supplied from the auxiliary application device 9 into the agricultural house 100. Therefore, even if the adsorption tank 6 does not store a sufficient amount of carbon dioxide, a sufficient amount of carbon dioxide can be supplied into the agricultural house 100.

Moreover, the supply of carbon dioxide from the adsorption tank 6 and the auxiliary application device 9 is performed using the blower 5. Therefore, it is possible to suppress the local supply of carbon dioxide into the agricultural house 100.

Therefore, carbon dioxide can be appropriately supplied into the agricultural house 100.
(2) Further, when carbon dioxide is supplied to the inside of the agricultural house 100 from the auxiliary application device 9 and the inside of the agricultural house 100 has an appropriate carbon dioxide concentration, the supply of carbon dioxide from the auxiliary application device 9 is stopped. To be done. Therefore, it is possible to suppress the excessive operation of the auxiliary application device 9 and maintain the carbon dioxide in the agricultural house 100 at an appropriate concentration.

[4. Other Embodiments]
(1) In the above embodiment, the in-flow passage concentration sensor 15C is provided in the in-house flow passage 15 on the downstream side of the second opening/closing valve 17B. However, the channel concentration sensor 15C may be provided at a different position in the channel. Specifically, the in-channel concentration sensor 15C is, for example, near the branch point of the in-house channel 15 with the third tank channel 20, the third tank channel 20, the second tank channel 19, or the like. May be provided in.

(2) The function of one component in the above embodiment may be shared by a plurality of components, or the function of a plurality of components may be performed by one component. Further, a part of the configuration of the above embodiment may be omitted as long as the problem can be solved. It should be noted that all aspects included in the technical idea specified by the wording recited in the claims are embodiments of the present disclosure.

[5. Correspondence with claims]
The control unit 7 and the plurality of on-off valves 12A, 14A, 15A, 15B, 16A, 17A, 17B in the above embodiment correspond to an example of the supply control unit. Further, the flow channel including at least the in-house flow channel 15 in the carbon dioxide application device 1 corresponds to an example of the carbon dioxide supply flow channel. Further, S200 and S225 of the CO2 supply process correspond to an example of the concentration detecting unit.

DESCRIPTION OF SYMBOLS 1... Carbon dioxide application apparatus, 2... Combustion apparatus, 5... Blower, 6... Adsorption tank, 7... Control part, 9... Auxiliary application apparatus, 15C... Flow path concentration sensor, 12A, 14A, 15A, 15B, 16A, 17A, 17B... Multiple on-off valves, 100... Agricultural house, 100A... In-house concentration sensor.

Claims (4)

A carbon dioxide application device as a main application device configured to supply carbon dioxide contained in combustion exhaust gas into an agricultural house,
An adsorption tank in which an adsorbent configured to adsorb carbon dioxide in the combustion exhaust gas is arranged,
A blower provided in the carbon dioxide supply channel and configured to flow down the gas in the carbon dioxide supply channel,
A supply control unit configured to supply carbon dioxide adsorbed to the adsorbent of the adsorption tank into the agricultural house by the blower via the carbon dioxide supply flow path,
And house the concentration is the concentration of carbon dioxide in said agricultural houses, the measured or estimated to as configured density detection and a feed concentration is the concentration of carbon dioxide supplied to the agricultural the house from adsorption tank And a section,
The supply control unit ,
After before Symbol predetermined time from the supply start time point of carbon dioxide from the adsorption tank to the agricultural houses inside has passed, below the supply threshold the feed concentration has been determined in advance, the carbon dioxide supply channel Through the blower , configured to supply carbon dioxide from the auxiliary application device into the agricultural house ,
When supplying carbon dioxide into the agricultural house from the auxiliary application device, when the house concentration exceeds a house threshold value larger than the supply threshold value, the supply of carbon dioxide from the auxiliary application device is stopped. A carbon dioxide application device configured to shut down . The carbon dioxide application device according to claim 1, wherein
The supply concentration is the concentration of carbon dioxide in the flow path that connects the adsorption tank and the agricultural house.
Carbon dioxide application device. The carbon dioxide application device according to claim 1 or 2, wherein
The auxiliary application device is configured as a device for heating the inside of the agricultural house while burning the fuel to generate carbon dioxide. The carbon dioxide application device according to claim 1 or 2, wherein
The auxiliary application device is configured as a cylinder for storing carbon dioxide,
The carbon dioxide application device is configured such that the supply control unit supplies carbon dioxide released from the auxiliary application device diluted with air into the agricultural greenhouse.

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