JP6350709B1 - Environmental management system in plant cultivation facilities - Google Patents

Abstract

An environment management system in a plant cultivation facility used for a cultivation facility that can control the inside of the plant cultivation facility to an appropriate humidity with a simple configuration. SOLUTION: A heating machine that is installed in a plant cultivation facility and that heats the cultivation facility by a combustion process when heating in the cultivation facility is required, and a dehumidifier that dehumidifies exhaust gas generated by the combustion process When the carbon dioxide recovery operation is performed to recover carbon dioxide from the dehumidified exhaust gas when the combustion process is being performed by the warmer, and the supply of carbon dioxide is required in the cultivation facility, A carbon dioxide recovery and supply device that performs a carbon dioxide supply operation to be supplied into the cultivation facility, a humidity sensor that measures humidity in the cultivation facility, and a humidity sensor when the carbon dioxide recovery operation and the carbon dioxide supply operation are not performed When the humidity in the cultivation facility measured in (1) becomes equal to or higher than a predetermined value, a dehumidification control device that dehumidifies the air in the cultivation facility by a dehumidifier is provided. [Selection] Figure 1

Description

  The present invention relates to an environmental management system in a plant cultivation facility.

  In plant cultivation facilities, the external natural environment greatly affects the temperature and humidity inside the facility. Therefore, it is necessary to control the temperature and humidity in the cultivation facility according to the external natural environment so that an environment suitable for plant growth is maintained.

Japanese Patent No. 5578469

  At night, the temperature in the cultivation facility decreases and the relative humidity increases rapidly. Therefore, heating and dehumidification are performed as necessary. At this time, if ventilation is performed for dehumidification, the temperature in the facility is lowered, and further heating is required. In addition, there is a problem that it takes cost and trouble to newly install a dehumidifier.

  The present invention has been made in view of the above circumstances, and aims to provide an environmental management system in a plant cultivation facility capable of controlling the inside of the plant cultivation facility to an appropriate humidity with a simple configuration. To do.

  An environmental management system in a plant cultivation facility according to the present invention for achieving the above object is installed in a plant cultivation facility, and when heating in the cultivation facility is required, the inside of the cultivation facility is subjected to a combustion process. A dehumidifier that dehumidifies the exhaust gas generated by the combustion process by the warmer, and collects carbon dioxide from the dehumidified exhaust gas when the dehumidifier is performing the combustion process. When the carbon dioxide recovery operation is performed and the supply of carbon dioxide is required in the cultivation facility, the carbon dioxide recovery supply is performed to supply the carbon dioxide recovered by the carbon dioxide recovery operation to the cultivation facility. A device, a humidity sensor that measures humidity in the cultivation facility, and when the carbon dioxide recovery operation and carbon dioxide supply operation are not performed in the carbon dioxide recovery supply device, The humidity of the culture facility which is measured in degrees sensor exceeds a predetermined value, characterized in that it comprises a dehumidifying controller for dehumidification of the air in the cultivation facilities by the dehumidifier.

  According to the environmental management system in the plant cultivation facility of the present invention, the inside of the plant cultivation facility can be controlled to an appropriate humidity with a simple configuration.

1 is an overall view showing a configuration of an in-facility environment management system using a dehumidification control device according to an embodiment. It is a flowchart showing a flow of the CO ₂ recovery process performed by the facility environmental management system using a dehumidification control system according to one embodiment. It is a flowchart showing a flow of CO ₂ supply process executed in the facility environment management system using the dehumidification control system according to one embodiment. It is a flowchart which shows the flow of the dehumidification process performed with the in-facility environmental management system using the dehumidification control apparatus by one Embodiment.

<Configuration of In-Facility Environmental Management System 1 Using Dehumidification Control Device According to One Embodiment>
A configuration of an in-facility environment management system 1 using a dehumidification control apparatus according to an embodiment of the present invention will be described with reference to FIG.

The in-facility environment management system 1 according to the present embodiment includes a temperature sensor 11, an illuminance sensor 12, a CO ₂ sensor 13, a humidity sensor 14, and a warmer 15, which are installed in the cultivation facility A to be managed. A purification device 16, a first three-way valve 17, a dehumidifier 18, a second three-way valve 19, a third three-way valve 20, a CO ₂ recovery supply device 21, and a control device 22 are provided.

The temperature sensor 11 measures the temperature in the cultivation facility A. The illuminance sensor 12 measures the illuminance in the cultivation facility A. The CO ₂ sensor 13 measures the carbon dioxide concentration in the cultivation facility A. The humidity sensor 14 measures the humidity in the cultivation facility A.

  The warmer 15 heats the inside of the cultivation facility A by burning fuel, and a pipe d1 is connected so that the exhaust gas discharged by the combustion process is supplied to the purification device 16. The purification device 16 removes and purifies nitrogen oxides (NOx) and sulfur oxides (SOx) from the exhaust gas introduced from the warmer 15 through the pipe d1.

  The first three-way valve 17 includes a connection port 17a connected to the purification device 16 via a pipe d2, a connection port 17b connected to the second three-way valve 19 via a pipe d3, and a pipe d4 to the dehumidifier 18. And a connection port 17c connected to each other. The first three-way valve 17 switches the flow path of the pipe d2 → pipe d4 and the flow path of the pipe d3 → pipe d4 by controlling the opening and closing of the connection ports 17a, 17b, and 17c.

  The dehumidifier 18 dehumidifies the air that has flowed in via the pipe d4, and can be constituted by a desiccant dehumidifier, for example.

  The second three-way valve 19 has a connection port 19a connected to the space in the cultivation facility A via the pipe d5, a connection port 19b connected to the outdoor space via the pipe d6, and a pipe to the first three-way valve 17. and a connection port 19c connected through d3. The second three-way valve 19 switches the flow path of the pipe d5 → pipe d3 and the flow path of the pipe d6 → pipe d3 by controlling the opening and closing of the connection ports 19a, 19b, and 19c.

The third three-way valve 20 is connected to the CO ₂ recovery and supply device 21 via the pipe d7, 20b connected to the space in the cultivation facility A via the pipe d8, and piped to the dehumidifier 18 and a connection port 20c connected via d9. The third three-way valve 20 switches the flow path of the pipe d9 → pipe d7 and the flow path of the pipe d9 → pipe d8 by controlling the opening and closing of the connection ports 20a, 20b, and 20c.

The CO ₂ recovery supply device 21 has a CO ₂ storage unit 211 and performs a CO ₂ recovery operation and a CO ₂ supply operation. The CO ₂ storage unit 211 has a first storage tower 211a and a second storage tower 211b that are connected to the third three-way valve 20 via a pipe d7 and are made of a hygroscopic agent (a substance such as silica gel or zeolite). First storage tower 211a and second storage tower 211b is pooled by adsorbing CO ₂ under high CO ₂ environment in a low CO ₂ environment, disengaging the reservoir was CO _2. In this embodiment, two storage towers are used in parallel, but one or three or more may be used. By installing a larger number of storage towers, the CO ₂ recovery and supply capacity can be improved. When installing multiple storage towers, it is convenient to replace the hygroscopic agent or perform maintenance by providing a valve at each doorway.

The control device 22 includes a CO ₂ recovery operation control unit 221, a CO ₂ supply operation control unit 222, and a dehumidification control unit 223.

The CO ₂ recovery operation control unit 221 is for recovering CO ₂ from the exhaust gas exhausted from the warmer 15 and purified and dehumidified when the warmer 15 is operating during a predetermined time period T1 at night. The CO ₂ recovery operation is executed by the CO ₂ recovery supply device 21. When executing a CO ₂ recovery operation, the CO ₂ recovery operation control unit 221, a connection port 17a and 17c of the first three-way valve 17 is in the open state, and the connection port 17b in the closed state. Further, the connection ports 20c and 20a of the third three-way valve 20 are opened, and the connection port 20b is closed.

The CO ₂ supply operation control unit 222 has the illuminance in the cultivation facility A measured by the illuminance sensor 12 at a predetermined time zone T2 during the daytime that is equal to or greater than a predetermined value and is measured in the cultivation facility A measured by the CO ₂ sensor 13. When the CO ₂ concentration is less than or equal to the predetermined value, it is determined that the supply of CO ₂ in the cultivation facility A is necessary. Then, incorporating the outside air, the reservoir column by a low CO ₂ atmosphere, the CO ₂ desorbed by supplying the recovered CO _2, the CO ₂ supply operation for causing the outflow in the cultivation facilities A The CO ₂ recovery and supply device 21 is made to execute. When executing the CO ₂ supply operation, CO ₂ supply operation control unit 222, a connection port 17a of the first three-way valve 17 is closed, the connection ports 17b and 17c in an open state. Further, the connection ports 19b and 19c of the second three-way valve 19 are opened, and the connection port 19a is closed. Further, the connection port 20c and the connection port 20a of the third three-way valve 20 are opened, and the connection port 20b is closed.

The dehumidification control unit 223 is configured such that the cultivation facility A measured by the humidity sensor 14 in a time zone T3 set in advance other than the time zone T1 that is the target of the CO ₂ recovery operation and the time zone T2 that is the target of the CO ₂ supply operation. When the humidity of the inside becomes a predetermined value or more, the dehumidification processing of the air in the cultivation facility A is performed by the dehumidifier 18 used in the CO ₂ recovery operation. When executing the dehumidifying process, the dehumidifying control unit 223 closes the connection port 17a of the first three-way valve 17 and opens the connection port 17b and the connection port 17c. Further, the connection port 19b of the second three-way valve 19 is closed, and the connection port 19a and the connection port 19c are opened. Further, the connection port 20c and the connection port 20b of the third three-way valve 20 are opened, and the connection port 20a is closed.

<Operation | movement of the in-facility environmental management system 1 using the dehumidification control apparatus by one Embodiment>
Next, the operation of the in-facility environment management system 1 according to the present embodiment will be described. In this embodiment, if the temperature in the cultivation facility A measured by the temperature sensor 11 is equal to or lower than a predetermined value, the warmer 15 is set to be switched to the ON state. The temperature value for switching the warmer 15 from the OFF state to the ON state may be changed according to the season. In the in-facility environmental management system 1, (1) processing executed in a time zone T1 preset as a target of CO ₂ recovery operation, and (2) in a time zone T2 preset as a target of CO ₂ supply operation. The processes to be executed and (3) the processes to be executed in the time zone T3 set in advance as the target of the humidity control operation other than the time zones T1 and T2 will be described with reference to the flowcharts of FIGS. .

[(1) Processing to be executed in time zone T1 set in advance as a target of CO ₂ recovery operation (see FIG. 2)]
When the start time of the time zone T1 preset as the target of the CO ₂ recovery operation arrives and the current time falls within the time zone T1 (“YES” in S1), whether or not the warmer 15 is in the ON state. Is determined by the CO ₂ recovery operation control unit 221 (S2). Here, in the CO ₂ recovery operation control unit 221, when the temperature acquired from a temperature sensor (not shown) that measures the temperature of the exhaust gas discharged from the warmer 15 exceeds a predetermined value, When a signal indicating that the warmer 15 is in the ON state is detected, it is determined that the warmer is in the ON state.

When the warmer 15 is in the ON state (“YES” in S2), the CO ₂ recovery operation control unit 221 controls the opening and closing of the first three-way valve 17 and the third three-way valve 20 (S3). Specifically, the connection ports 17a and 17c of the first three-way valve 17 are open, the connection port 17b is closed, the connection ports 20c and 20a of the third three-way valve 20 are open, and the connection port 20b is closed. It is controlled to become.

As described above, by controlling the opening and closing of the connection port of the three-way valve, the exhaust gas having a high CO ₂ concentration discharged from the warmer 15 is discharged to the purification device 16 through the pipe d1 to remove NOx and SOx. Then, it is purified, and further flows out to the dehumidifier 18 through the pipes d2 and d4 to be dehumidified. The dehumidified exhaust gas flows out to the CO ₂ recovery supply device 21 through the pipes d9 and d7.

When the exhaust gas high from the pipe d7 of the CO ₂ concentration in the CO ₂ recovery feeder 21 is introduced, the CO ₂ recovery operation under CO ₂ reservoir 211 is started, CO ₂ is the first storage tower 211a in the exhaust gas and the second It is adsorbed by the storage tower 211b (S4). Thereafter, the process returns to step S1, and during the time period T1, it is continuously monitored whether or not the warmer is in the ON state (“YES” in S1, S2).

Then, when the temperature in the cultivation facility A becomes equal to or higher than the predetermined value and the warmer 15 is switched to the OFF state (“NO” in S2), the exhaust gas having a high CO ₂ concentration does not flow out from the warmer 15, and CO _2. The collection operation is stopped (S5). Further, when the current time is not within the time zone T1 (“NO” in S1), the first three-way valve 17 and the third three-way valve 17 and the third valve are prevented so that the exhaust gas from the warmer 15 does not flow into the CO ₂ recovery supply device 21. The opening and closing of the connection port of the three-way valve 20 is controlled, and the CO ₂ recovery operation is stopped (S5).

[(2) Processing to be executed in time zone T2 set in advance as a target of CO ₂ supply operation (see FIG. 3)]
When the start time of the time zone T2 preset as the target of the CO ₂ supply operation arrives and the current time falls within the time zone T2 (“YES” in S11), the CO ₂ supply operation control unit 222 of the control device 22 It is determined whether or not the illuminance in the cultivation facility A measured by the illuminance sensor 12 is equal to or greater than a predetermined value and the CO ₂ concentration in the cultivation facility A measured by the CO ₂ sensor 13 is equal to or smaller than a predetermined value. (S12). When the CO ₂ supply operation control unit 222 determines that the illuminance in the cultivation facility A is equal to or higher than a predetermined value and the CO ₂ concentration is equal to or lower than the predetermined value (“YES” in S12), the first three-way valve 17, The opening and closing of the two-way valve 19 and the third three-way valve 20 are controlled (S13). Specifically, the connection port 17a of the first three-way valve 17 is closed, the connection ports 17b and 17c are open, the connection port 19a of the second three-way valve 19 is closed, and the connection ports 19b and 19c are open. The connection ports 20c and 20a of the third three-way valve 20 are controlled to be in an open state and the connection port 20b is in a closed state.

By controlling the opening and closing of the three-way valve in this way, the outside air flows into the CO ₂ recovery and supply device 21 via the pipes d6, d3, d4, d9, and d7. When outside air flows into the CO ₂ recovery supply device 21 from the pipe d7, since the outside air has a low CO ₂ concentration, the CO ₂ supply operation is started in the CO ₂ storage unit 211, and the first storage tower 211a and the second storage tower 211b. The CO ₂ adsorbed on the gas is released. The separated CO ₂ is supplied into the cultivation facility A from the pipe d10 together with the air flowing in from the pipe d7 (S14). The CO ₂ supply operation is performed by switching between execution and stop of the CO ₂ separation process in units of several minutes. Thereafter, the process returns to step S11, during the time period T2, the illuminance in the cultivation facilities A is equal to or higher than a predetermined value, and the CO ₂ concentration is continued monitoring of or less than a predetermined value (S11 of " YES ", S12).

And when it is judged that the illuminance in the cultivation facility A has become a predetermined value or less, or the CO ₂ concentration has become a predetermined value or more continuously for a certain period of time (“NO” in S12), or the current time is time When it is no longer in the belt T2 (“NO” in S11), the first three-way valve 17, the second three-way valve 19, and the third three-way valve 20 are connected so that outside air does not flow into the CO ₂ recovery supply device 21. The opening and closing of the port is controlled, and the CO ₂ supply operation is stopped (S15).

Moreover, in the process mentioned above, as conditions for performing the CO ₂ supply operation in the time zone T2, in addition to the illuminance within the cultivation facility A being a predetermined value or more and a CO ₂ concentration being a predetermined value or less, You may add that the measured value acquired from the sensor (not shown) which measures soil moisture content is more than predetermined value. By adding this condition, it is possible to perform environmental management by energy-saving control suitable for plant photosynthesis.

[(3) Processing executed in time zone T3 set in advance as a target for humidity control other than time zones T1 and T2 (see FIG. 4)]
When the start time of the time zone T3 preset as the target of humidity control has arrived and the current time is within the time zone T3 (“YES” in S21), the dehumidification control unit 223 of the control device 22 causes the humidity sensor 14 to It is determined whether or not the measured humidity in the cultivation facility A is equal to or higher than a predetermined value (S22). When the dehumidification control unit 223 determines that the humidity in the cultivation facility A is equal to or higher than a predetermined value (for example, 85%) (“YES” in S22), the first three-way valve 17, the second three-way valve 19, and the first The opening and closing of the three-way valve 20 is controlled (S23). Specifically, the connection port 17a of the first three-way valve 17 is closed, the connection ports 17b and 17c are open, the connection ports 19a and 19c of the second three-way valve 19 are open, the connection port 19b is closed, 3. Control is performed so that the connection port 20a of the three-way valve 20 is closed and the connection ports 20b and 20c are opened.

By controlling the opening and closing of the three-way valve in this way, the air in the cultivation facility A that has flowed in via the pipes d5, d3, and d4 flows out to the dehumidifier 18 that is used for the CO ₂ recovery operation.

  In the dehumidifier 18, the dehumidification process of the air flowing in from the pipe d4 is started by the control of the humidity control unit 223, and the dehumidified air is supplied into the cultivation facility A through the pipes d9 and d8 (S24). . Thereafter, the process returns to step S21, and during the time zone T3, it is continuously monitored whether or not the humidity in the cultivation facility A is equal to or higher than a predetermined value ("YES" in S21, S22).

  When it is determined that the humidity in the cultivation facility A has become a predetermined value or less (“NO” in S22), or when the current time is not within the time zone T3 (“NO” in S21), The opening and closing of the connection port of the first three-way valve 17 and the second three-way valve 19 is controlled so that the air in the cultivation facility A does not flow into the dehumidifier 18, and the dehumidification processing of the air in the cultivation facility A by the dehumidifier 18 is stopped. (S25).

  In addition, in the above-described processing, as a condition for executing the humidity control in the time zone T3, in addition to the humidity in the cultivation facility A being a predetermined value or higher, the outdoor absolute humidity is lower than the indoor absolute humidity. May be. By adding this condition, the effect of humidity control can be enhanced.

  According to the above embodiment, in the plant cultivation facility, when the humidity rises rapidly after sunset until the night time zone that requires heating treatment, it is simplified using existing equipment. With the system configured as above, the inside of the cultivation facility can be controlled to an appropriate humidity.

Further, in the above-described embodiment, the time zone T1 that is the target of the CO ₂ recovery operation, the time zone T2 that is the target of the CO ₂ supply operation, and the time zone T3 that is the target of the humidity control are set to the region (climate) and season. By changing the settings as appropriate, etc., the inside of the cultivation facility can be maintained in a suitable environment for plant growth with higher accuracy.

1 facility environmental management system 11 Temperature sensor 12 illumination sensor 13 CO ₂ sensor 14 and humidity sensor 15 heating unit 16 purification device 17 first three-way valve 17a, 17b, 17c connecting port 18 dehumidifier 19 second three-way valve 19a, 19b, 19c connecting port 20 third three-way valve 20a, 20b, 20c connecting port 21 CO ₂ recovery feeder 22 controller 211 CO ₂ reservoir 211a first storage tower 211b the second storage tower 221 CO ₂ recovery operation control unit 222 CO ₂ supply Operation control unit 223 Dehumidification control unit

Claims (2)

When it is installed in a plant cultivation facility and it is determined that heating in the cultivation facility is necessary, a heating machine that heats the cultivation facility by combustion processing;
A dehumidifier for dehumidifying the exhaust gas generated by the combustion treatment by the heater;
When a combustion process is being performed by the warmer, performing a carbon dioxide recovery operation for recovering carbon dioxide from the exhaust gas dehumidified by the dehumidifier, and determining that the supply of carbon dioxide is necessary in the cultivation facility A carbon dioxide recovery and supply device for performing a carbon dioxide supply operation for supplying carbon dioxide recovered by the carbon dioxide recovery operation to the cultivation facility;
A humidity sensor for measuring the humidity in the cultivation facility;
When the humidity in the cultivation facility measured by the humidity sensor is equal to or higher than a predetermined value when the carbon dioxide recovery operation and the carbon dioxide supply operation are not performed in the carbon dioxide recovery supply device, the dehumidifier An environmental management system in a plant cultivation facility, comprising: a dehumidification control device that performs dehumidification of air in the cultivation facility. The carbon dioxide recovery supply device performs the carbon dioxide recovery operation within a predetermined time zone at night, performs the carbon dioxide supply operation within a predetermined time zone during the day,
The dehumidification control device, when the humidity in the cultivation facility measured by the humidity sensor between the end of the predetermined time zone during the day and the start of the predetermined time zone during the night becomes a predetermined value or more, The environment management system in a plant cultivation facility according to claim 1, wherein the dehumidifier dehumidifies air in the cultivation facility.

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