JP2023183785A - Carbon dioxide-containing gas supply system, and carbon dioxide-containing gas supply method - Google Patents

Abstract

To provide a system capable of supplying carbon dioxide-containing gas into a greenhouse as a demanding part of carbon dioxide-containing gas, and controlling humidity inside the greenhouse.SOLUTION: A carbon dioxide-containing gas supply system comprises: a boiler 20 which creates carbon dioxide-containing gas to be supplied to a demanding part of carbon dioxide-containing gas; a heat exchanger 31 which cools carbon dioxide-containing gas before supplying to the demanding part by heat exchange with outside air OA; a heat storage tank 32 which is constituted to be capable of repeatedly performing a heat storage operation and a heat radiation operation by adsorption and desorption of an adsorbate to a stored adsorbent M; an outward pipe 34 which introduces highly humid air RA in the demanding part to the heat storage tank 32; and a return pipe 35 which introduces low humid air SA which is created by drying the highly humid air RA by a heat radiation operation in the heat storage tank 32 to the demanding part, where the heat storage tank 32 performs a heat storage operation by introduction of the outside air OA which is heated by heat exchange with carbon dioxide-containing gas in the heat exchanger 31, and performs a heat radiation operation by introduction of highly humid air RA supplied from the demanding part.SELECTED DRAWING: Figure 1

Description

The present invention relates to a carbon dioxide-containing gas supply system and a carbon dioxide-containing gas supply method to a carbon dioxide-containing gas demand unit.

Conventionally, in greenhouse horticulture using greenhouses such as plastic greenhouses, heat generated by burning fuels such as heavy oil and kerosene is supplied to the greenhouse as hot air and hot water in order to control the temperature inside the greenhouse. There is. In addition, in such greenhouse horticulture, for the purpose of promoting crop growth and increasing yield, carbon dioxide-containing gas produced by burning the above-mentioned fuel is supplied into the greenhouse to promote photosynthesis of crops. It is being said.

For example, Patent Document 1 discloses a supply device that supplies carbon dioxide-containing gas and heat to crop production facilities. The supply device described in Patent Document 1 includes a combustion furnace that burns fuel, and a heat exchanger that obtains heat through heat exchange with combustion exhaust gas discharged from the combustion furnace and supplies heat to crop production facilities. Be prepared. Further, according to the supply device described in Patent Document 1, sulfur oxides, soot, nitrogen oxides, carbon monoxide, and ethylene contained in combustion exhaust gas are removed, and the combustion exhaust gas purified by these removals is used for crop production. It is supplied to the facility.

JP2016-36334A

By the way, in this type of greenhouse horticulture, in addition to controlling the temperature inside the greenhouse by supplying heat and controlling the carbon dioxide concentration in the greenhouse by supplying carbon dioxide-containing gas as described above, it is also necessary to control the humidity inside the greenhouse. There are cases. If the humidity in a greenhouse is not properly controlled, this may affect the photosynthesis and respiration of crops or cause the breeding of pests and pathogens.

For example, humidity control in a greenhouse is performed by circulating and exchanging air within the greenhouse by installing a ventilation fan. However, when controlling the humidity in a greenhouse using a ventilation fan in this way, there is a risk that moisture will be taken away from the soil and crops due to excessive ventilation. Further, when controlling the humidity in the greenhouse using a ventilation fan in this way, it is possible to reduce the relative humidity in the greenhouse, but it is difficult to reduce the absolute humidity in the greenhouse.

The above-mentioned conventional technology does not disclose or suggest improvements to this point, and it is necessary to develop a system that can supply heat and carbon dioxide-containing gas to the greenhouse and also manage the humidity inside the greenhouse, especially dehumidifying the greenhouse. was awaited.

The present invention has been made in view of the above, and provides a system that can supply carbon dioxide-containing gas into a greenhouse as a demand unit for carbon dioxide-containing gas, and also manage humidity within the greenhouse. The purpose is to

In order to solve the above-mentioned problems, the present invention provides a system for supplying carbon dioxide-containing gas to a demand section, which includes a boiler that generates the carbon dioxide-containing gas to be supplied to the demand section by burning fuel. and a heat exchanger that cools the carbon dioxide-containing gas before being supplied to the demand section by heat exchange with the introduced outside air, and a heat storage operation and a heat radiation operation by adsorption and desorption of adsorbate to the stored adsorbent. A heat storage tank configured to be repeatable, an outgoing pipe that supplies indoor air to be treated from the demand unit to the heat storage tank, and a pipe that supplies the indoor air dehumidified by heat dissipation operation in the heat storage tank from the heat storage tank. a return pipe for supplying to the demand section, the heat storage tank performs the heat storage operation by introducing the outside air heated by heat exchange with the carbon dioxide-containing gas in the heat exchanger, and The heat dissipation operation is performed by introducing the indoor air supplied from the inside.

According to the present invention, a heat exchanger is provided on the supply path of the carbon dioxide-containing gas from the boiler to the demand section of the carbon dioxide-containing gas, and the heat exchanger exchanges heat with the carbon dioxide-containing gas from the boiler and outside air. do. The outside air heated by heat exchange with the carbon dioxide-containing gas is used for heat storage operation of a heat storage tank containing an adsorbent. In the heat storage tank that has been subjected to heat storage operation using outside air, heat radiation operation is performed by introducing air from the demand section. Indoor air is dehumidified by this heat dissipation operation, and then supplied to the demand section.
That is, according to the present invention, indoor air is dehumidified by heat dissipation operation in the heat storage tank, and then the dehumidified indoor air is returned to the demand section, thereby making it possible to lower the absolute humidity of the demand section.

Further, according to the present invention, the action of the heat exchanger described above allows the carbon dioxide-containing gas to be cooled before being supplied to the demand section. As a result, only the carbon dioxide-containing gas can be supplied into the demand section without supplying heat from the boiler, especially during summer operation when the demand for heat within the demand section is small.
Further, at this time, the heat recovered from the carbon dioxide-containing gas is used for desorption of adsorbate from the heat storage material housed in the heat storage tank, that is, for heat storage operation of the heat storage tank. According to the present invention, since heat is stored by desorption of adsorbate in this way, the heat stored in the adsorbent is not lost over time, and the adsorption of adsorbate by the adsorbent, that is, heat dissipation from the heat storage tank, is prevented. Indoor air can be dehumidified by operation. In other words, using the heat recovered from the carbon dioxide-containing gas, it is possible to appropriately manage the humidity in the demand section at any timing.

The carbon dioxide-containing gas supply system may include temperature control piping for adjusting the room temperature within the demand section.
According to the present invention, in addition to the above-described humidity control within the demand section, temperature control within the demand section can be appropriately performed, and thereby the temperature within the demand section can be maintained at a temperature suitable for the crops to be grown.

Note that hot water generated by the boiler can be used as the heat medium flowing through the temperature control pipe.
By using hot water as a heat medium in this way, it is possible to appropriately heat (temperature control) the inside of the demand section, especially during operation during the winter/intermediate period when the demand for heat is large. Additionally, by using hot water from the boiler as a heat medium, there is no need to prepare a new heat medium to flow through the temperature control piping, reducing resource and energy consumption during system operation. be able to.

The carbon dioxide-containing gas supply system may include a second heat exchanger for heating the heat medium flowing through the temperature control pipe. In the second heat exchanger, heat exchange may be performed between the indoor air dehumidified by the heat dissipation operation and the heat medium flowing through the temperature control pipe.
According to the present invention, the indoor air after dehumidification can be cooled by heat exchange with the heat medium flowing through the temperature control pipe, so that it is possible to suppress the ambient temperature in the demand section from rising excessively. In addition, at this time, the heat medium flowing through the temperature control pipe can be heated by heat exchange with the indoor air after dehumidification, so heating (temperature control) in the demand section can be made more appropriate, especially during winter/intermediate operation. It can be carried out.

The carbon dioxide-containing gas supply system includes a preheating heat exchanger that heats the outside air before heat exchange with the carbon dioxide-containing gas in the heat exchanger by heat exchange with a heat medium flowing through the temperature control pipe. may be provided.
According to the present invention, outside air can be preheated prior to heat exchange with carbon dioxide-containing gas in a heat exchanger. Thereby, the temperature of the outside air introduced into the heat storage tank can be made higher by heat exchange with the carbon dioxide-containing gas, and the drying of the adsorbent in the heat storage tank (heat storage operation) can be performed more efficiently.

The carbon dioxide-containing gas supply system includes a heat storage tank for storing heat obtained from the carbon dioxide-containing gas, a cooling tower for cooling the carbon dioxide-containing gas, and a heat storage tank and a cooling tower. and a third heat exchanger that cools the carbon dioxide-containing gas before being supplied to the demand unit by heat exchange with a refrigerant circulated between at least one of the parts.
According to the present invention, the temperature of the carbon dioxide-containing gas supplied into the demand section can be further lowered, and thereby the efficiency can be improved, particularly during summer operation when the demand for heat within the demand section is small.

Note that the third heat exchanger described above is desirably disposed downstream of the heat exchanger that performs heat exchange with outside air in the supply route of the carbon dioxide-containing gas.
According to the present invention, the higher temperature carbon dioxide-containing gas can be recovered by the heat exchanger and used for the heat storage operation of the heat storage tank, so that the heat storage efficiency in the heat storage tank can be improved.

Note that cold water generated in the cooling tower may be used as the heat medium flowing through the temperature control pipe.
By using chilled water as a heat medium flowing through the temperature control piping, it is possible to appropriately cool (temperature control) the inside of the demand section, especially during operation in the summer when there is a large demand for cooling and heat. In addition, by using the cold water from the cooling tower as a heat medium, there is no need to prepare a new heat medium to flow through the temperature control piping, and it is possible to reduce resource and energy consumption during system operation. can.

Further, hot water generated in the heat storage tank may be made to flow through the temperature control piping as a heat medium.
This makes it possible to properly heat (temperature control) the demand section, especially during the winter/mid-season, in the same way as when hot water from the boiler is used as a heat medium, and also reduces resource and energy consumption related to system operation. reduction can be achieved.

The carbon dioxide-containing gas supply system may further include a measuring means for measuring the carbon dioxide concentration and temperature and humidity in the demand section, and a control means. At this time, it is preferable that the control means controls the air volume and temperature/humidity of the carbon dioxide-containing gas introduced into the demand section based on the measurement result by the measurement means.
According to the present invention, since the system is controlled based on the environment within the demand section, the inside of the greenhouse can be maintained in an environment suitable for the crops to be grown, and as a result, the quality and yield of the crops can be improved.

The present invention according to another aspect is a method for supplying carbon dioxide-containing gas to a demand section for carbon dioxide-containing gas, which includes a step of generating carbon dioxide-containing gas by burning fuel and exchanging heat with introduced outside air. , a step of cooling the carbon dioxide-containing gas before being supplied to the demand section, a step of supplying the carbon dioxide-containing gas cooled by the heat exchange into the demand section, and a step of cooling the carbon dioxide-containing gas before being supplied to the demand section; A step of introducing the outside air heated by the exchange into a heat storage tank containing an adsorbent to perform a heat storage operation of the heat storage tank; The method is characterized in that it includes a step of performing a heat radiation operation, and a step of supplying the indoor air dehumidified by the heat radiation operation into the demand section.

Moreover, the carbon dioxide-containing gas supply method may further include the step of measuring the carbon dioxide concentration and temperature and humidity in the demand section. At this time, it is desirable to determine the air volume and temperature/humidity of the carbon dioxide-containing gas to be introduced into the demand section based on the measured carbon dioxide concentration and temperature/humidity within the demand section.

According to the present invention, it is possible to provide a system capable of supplying carbon dioxide-containing gas into a greenhouse as a demand unit for carbon dioxide-containing gas, as well as controlling humidity within the greenhouse.

FIG. 1 is an explanatory diagram schematically showing an outline of a system of a carbon dioxide-containing gas supply system according to an embodiment. FIG. 2 is an explanatory diagram schematically showing the configuration of a heat storage tank containing an adsorbent. FIG. 3 is an explanatory diagram schematically showing an outline of a system of a carbon dioxide-containing gas supply system according to another embodiment. FIG. 2 is an explanatory diagram showing an example of the operation of the carbon dioxide-containing gas supply system during the daytime during the winter/intermediate period. FIG. 7 is an explanatory diagram showing another example of the operation of the carbon dioxide-containing gas supply system during the daytime during the winter/intermediate period. FIG. 7 is an explanatory diagram showing another example of the operation of the carbon dioxide-containing gas supply system during the daytime during the winter/intermediate period. FIG. 2 is an explanatory diagram showing an example of the operation of the carbon dioxide-containing gas supply system at night during the winter/intermediate period. FIG. 2 is an explanatory diagram showing an example of the operation of the carbon dioxide-containing gas supply system during the daytime in summer. FIG. 2 is an explanatory diagram showing an example of the operation of the carbon dioxide-containing gas supply system at night in summer.

Embodiments of the present invention will be described below. FIG. 1 schematically shows an outline of a system of a carbon dioxide-containing gas supply system 1 according to an embodiment. In one embodiment, the carbon dioxide-containing gas supply system 1 includes a greenhouse 10, a boiler 20, a temperature and humidity adjustment section 30, and a temperature adjustment section 40.

The greenhouse 10 is a facility for producing crops, such as a plant factory or a plastic greenhouse, and grows crops (facilities horticulture) therein. The greenhouse 10 is provided with an internal supply pipe 11, an internal temperature control pipe 12, a temperature control heat exchanger 13, and a ventilation section 14.

The internal supply pipe 11 is a pipe for supplying carbon dioxide-containing gas from a boiler 20, which will be described later, into the greenhouse 10, and its upstream end is connected to an external supply pipe 21, which will be described later, and its downstream end is connected to an external supply pipe 21, which will be described later. It is placed at a desired position within the greenhouse 10.
The internal temperature control pipe 12 is a pipe for adjusting the temperature inside the greenhouse 10, and is buried in the greenhouse 10 in one example, and is connected to the boiler 20 as a heat medium via an external temperature control pipe 22, which will be described later. The temperature inside the greenhouse 10 is adjusted from underground by circulating hot water and cold water.
The temperature adjustment heat exchanger 13 adjusts the temperature of the atmosphere in the greenhouse 10, for example, by exchanging heat with a heat medium flowing through the internal temperature adjustment pipe 12. In other words, the internal temperature control pipe 12 may be branched into a branch pipe 12a for exchanging heat with the air in the greenhouse 10 in the temperature control heat exchanger 13.
In one embodiment, the ventilation section 14 may include at least one of a ventilation fan, an opening, and a dehumidifier. The ventilation section 14 reduces the humidity (relative humidity) in the greenhouse 10 that has increased due to, for example, evapotranspiration from crops, water evaporation from the soil surface, or artificial humidification.

Note that the branch pipe 12a for supplying the heat medium to the temperature control heat exchanger 13 may be provided with a damper (not shown) for controlling the flow of the heat medium to the temperature control heat exchanger 13.

The boiler 20 burns the supplied fuel and discharges high-temperature carbon dioxide-containing gas as exhaust gas. The fuel supplied to the boiler 20 can be arbitrarily selected as long as it can generate carbon dioxide-containing gas. For example, the fuel may be a liquid fuel such as heavy oil or kerosene, or a gaseous fuel such as natural gas. Carbon dioxide-containing gas generated in the boiler 20 is supplied into the greenhouse 10 via an external supply pipe 21 and an internal supply pipe 11.

The external supply pipe 21, which is a supply route for carbon dioxide-containing gas, includes a first heat exchanger 31 (described later) of the temperature/humidity adjustment section 30, an air supply means 21a, and a third heat exchanger (described later) of the temperature adjustment section 40. The vessels 41 are arranged in this order from the upstream side.

In one embodiment, the air supply means 21a includes a fan. The fan of the air supply means 21a may be an inverter-controlled fan. The air supply means 21a introduces carbon dioxide-containing gas via a damper (not shown) provided on the inlet side (boiler 20 side), and transfers the introduced carbon dioxide-containing gas to a third heat exchanger disposed on the downstream side. Air is blown toward the container 41.

Further, in the boiler 20, hot water is generated when the above-mentioned fuel is combusted. The generated hot water is circulated between the internal temperature regulating pipe 12 (greenhouse 10 ) via the external temperature regulating pipe 22 and is used to adjust the temperature inside the greenhouse 10 .
In this embodiment, the external temperature control pipe 22 and the internal temperature control pipe 12 correspond to "temperature control piping" according to the present invention.

A circulation means 22a is arranged in the external temperature control pipe 22, which is a circulation path for the heat medium. In one embodiment, circulation means 22a includes a pump. The pump of the circulation means 22a may be an inverter-controlled pump. In this embodiment, hot water or cold water as a heat medium is circulated through the temperature control piping by the action of the circulation means 22a.

The temperature and humidity adjustment section 30 includes a first heat exchanger 31 , a heat storage tank 32 , a second heat exchanger 33 , an outgoing pipe 34 , and a returning pipe 35 . The temperature and humidity adjustment unit 30 cools the carbon dioxide-containing gas supplied from the boiler 20 and lowers the humidity of the humid air RA supplied from the greenhouse 10.

The first heat exchanger 31 is arranged upstream of the above-mentioned air supply means 21a in the external supply pipe 21 which is a supply route for carbon dioxide-containing gas. The first heat exchanger 31 lowers the temperature of the carbon dioxide-containing gas discharged from the boiler 20 before being supplied to the greenhouse 10 by exchanging heat with the introduced outside air OA.
The outside air OA subjected to heat exchange with the carbon dioxide-containing gas is passed through the outside air introduction pipe 31a as dry air DA having a higher temperature and lower humidity than the outside air OA before being introduced into the first heat exchanger 31. It is introduced into a heat storage tank 32, which will be described later.

In one embodiment, an air supply means 31c for introducing outside air OA to the first heat exchanger 31 is connected to the outside air introduction pipe 31a. The air supply means 31c includes a fan. The fan of the air supply means 31c may be an inverter-controlled fan. The air supply means 31c introduces outside air OA from the inlet side, and blows the introduced outside air OA toward the first heat exchanger 31 disposed on the downstream side.

As shown in FIG. 2, the heat storage tank 32 has a filling part 32a filled with an adsorbent M divided by a breathable partition plate, and spaces 32b, 32c is provided. An outside air introduction pipe 31a and an outgoing pipe 34 are connected to the upstream space 32b. An outside air exhaust pipe 31b and a return pipe 35 are connected to the downstream space 32c.

In addition, in FIG. 2, the upstream space 32b is illustrated for the case where the outside air introduction pipe 31a and the outgoing pipe 34 are connected after being merged, that is, the case where only one pipe is connected to the space 32b. However, as shown in FIG. 1, the outside air introduction pipe 31a and the outgoing pipe 34 may be independently connected to the space 32b. Similarly, in the upstream space 32c, the outside air exhaust pipe 31b and the return pipe 35 may be connected as one pipe as shown in FIG. The pipe 31b and the return pipe 35 may be connected independently.
In addition, in the drawings (FIGS. 3 to 9) used in the following explanation, for clarity of explanation, the outside air introduction pipe 31a, the outgoing pipe 34, the outside air exhaust pipe 31b, and the returning pipe 35 are shown to be independent of the heat storage tank 32. The illustration is based on an example where the cables are connected as follows.

As shown in FIG. 2, the outside air inlet pipe 31a, the outside air discharge pipe 31b, the outgoing pipe 34, and the incoming pipe 35 connected to the heat storage tank 32 are provided with corresponding dampers d1 to d4, respectively. The temperature and humidity adjustment section 30 controls the introduction of dry air DA and humid air RA, which will be described later, into the heat storage tank 32 by controlling the opening and closing of these dampers d1 to d4. Note that for these dampers d1 to d4, for example, motor dampers that are easy to control may be used.

Further, the outgoing pipe 34 that introduces the humid air RA from the greenhouse 10 into the heat storage tank 32 is provided with an air supply means 34a.
In one embodiment, the air supply means 34a includes a fan. The fan of the air supply means 34a may be an inverter-controlled fan. The air supply means 34a introduces humid air RA through a damper (not shown) provided on the inlet side (greenhouse 10 side), and blows the introduced humid air RA toward the heat storage tank 32 disposed on the downstream side. do.

In one embodiment, as the adsorbent M filled in the filling part 32a, for example, a granulated adsorbent can be used. This adsorbent M can be a known adsorbent that generates heat by adsorbing an adsorbate such as silica gel or zeolite, and can be used to create an adsorbent with desired performance such as ventilation resistance and heat/mass transfer. The granules can be used as an adsorbent with a heat storage function. In such cases, a composite consisting of amorphous aluminum silicate and low-crystalline clay, such as Hasclay (registered trademark) or a low-temperature regenerated adsorbent of a polymer sorbent, or a conventional adsorbent (such as silica gel or zeolite) may be used. ) can be applied as the adsorbent M.

In the heat storage tank 32, the adsorbent is desorbed from the adsorbent M by the dry air DA introduced through the outside air introduction pipe 31a, that is, heat storage operation is performed. The dry air DA used in the heat storage operation of the heat storage tank 32 is discharged to the outside of the heat storage tank 32 via the outside air discharge pipe 31b.
In addition, in the heat storage tank 32, the humid air RA introduced from the greenhouse 10 through the outgoing pipe 34 adsorbs adsorbate onto the adsorbent M, that is, performs a heat dissipation operation. The humid air RA subjected to the heat dissipation operation of the heat storage tank 32 is heated and dried by the heat generation of the adsorbent M accompanying the heat dissipation operation and the adsorption of adsorbate to the adsorbent M, so that the humid air RA has a higher temperature and lower humidity than the humid air RA. The air is supplied to the greenhouse 10 as low humidity air SA.

The second heat exchanger 33 is arranged on the supply path of the low-humidity air SA from the heat storage tank 32, that is, on the return pipe 35. The second heat exchanger 33 lowers the temperature of the high-temperature, low-humidity air SA drawn out from the heat storage tank 32, for example, by exchanging heat with the heat medium flowing through the external temperature control pipe 22. In other words, the external temperature control pipe 22 may be branched into a branch pipe 22b for exchanging heat with the low-humidity air SA in the second heat exchanger 33.

Note that a damper (not shown) for controlling the flow of the heat medium to the second heat exchanger 33 may be provided at a branch portion of the external temperature control pipe 22 from the branch pipe 22b. By opening and closing this damper, the heat medium circulating through the external temperature control pipe 22 is supplied to the greenhouse 10 via the second heat exchanger 33 or to the greenhouse 10 without passing through the second heat exchanger 33. You can choose whether to supply

The temperature adjustment section 40 includes a third heat exchanger 41, a refrigerant pipe 42, a heat storage 43, and a cooling tower 44. The temperature adjustment section 40 cools the carbon dioxide-containing gas supplied from the boiler 20.

The third heat exchanger 41 is arranged on the downstream side of the above-mentioned air supply means 21a in the external supply pipe 21 which is a supply route for carbon dioxide-containing gas. In other words, the temperature adjustment section 40 is arranged downstream of the temperature and humidity adjustment section 30. Further, the third heat exchanger 41 is connected to a heat storage 43 and a cooling tower 44, which will be described later, via a refrigerant pipe 42, and is configured to be able to circulate the refrigerant between the heat storage 43 and the cooling tower 44. .

The third heat exchanger 41 lowers the temperature of the carbon dioxide-containing gas discharged from the boiler 20 by exchanging heat with the refrigerant circulating inside the refrigerant pipe 42 . More specifically, when there is no need to dehumidify the carbon dioxide-containing gas supplied to the greenhouse 10 (when there is no need to operate the temperature/humidity adjustment section 30), the temperature of the carbon dioxide-containing gas from the boiler 20 is lowered. . The carbon dioxide-containing gas cooled in the third heat exchanger 41 is then supplied to the greenhouse 10.
The heat recovered from the carbon dioxide-containing gas by the third heat exchanger 41 is sent to the heat storage 43 via the refrigerant pipe 42, as described later, and is stored in the heat storage 43.

However, the third heat exchanger 41 is not limited to cases in which there is no need to dehumidify the carbon dioxide-containing gas supplied to the greenhouse 10; It may also be used when it is desired to further lower the gas temperature.

A circulation means 42a is arranged in the refrigerant pipe 42, which is a refrigerant circulation path. In one embodiment, circulation means 42a includes a pump. The pump of the circulation means 42a may be an inverter-controlled pump. In the present embodiment, in the temperature adjustment section 40, the refrigerant is circulated within the refrigerant pipe 42 by the action of the circulation means 42a.

As described above, the heat storage 43 introduces a refrigerant heated by heat exchange with the carbon dioxide-containing gas, thereby removing the carbon dioxide-containing gas from the carbon dioxide-containing gas into the heat storage material (for example, water) housed in the heat storage 43. Store the heat obtained.
Note that the heat storage method in the heat storage 43 is not particularly limited, and that is, sensible heat storage or latent heat storage may be performed.

Further, the heat storage 43 is connected to the external temperature control pipe 22 as a temperature control pipe via a connection pipe 43a. The connecting pipe 43a is provided with a damper (not shown), and is configured to be able to switch the connection of the connecting pipe 43a to the external temperature control pipe 22 as desired.
In the heat storage 43, by opening the damper (not shown) and connecting the connecting pipe 43a to the external temperature control pipe 22, the heat medium can be circulated between the greenhouse 10 and the heat stored in the heat storage material. Heating of the medium can be performed.

The cooling tower 44 is arranged downstream of the heat storage 43 in the refrigerant pipe 42 which is a refrigerant circulation path. In the cooling tower 44, the refrigerant whose temperature has increased due to heat exchange with the carbon dioxide-containing gas in the third heat exchanger 41 and heat storage in the heat storage material in the heat storage 43 is cooled.
The refrigerant cooled in the cooling tower 44 is supplied again to the third heat exchanger 41 via the refrigerant pipe 42, and is used to cool the carbon dioxide-containing gas.

Further, the cooling tower 44 is connected to the external temperature control pipe 22 as a temperature control pipe via a connection pipe 44a. The connecting pipe 44a is provided with a damper (not shown), and is configured to be able to switch the connection of the connecting pipe 44a to the external temperature control pipe 22 as desired.
In the cooling tower 44, by opening a damper (not shown) and connecting the connecting pipe 44a with the external temperature control pipe 22, cold water as a heat medium can be circulated between the greenhouse 10 and the internal temperature of the greenhouse 10. can be lowered.

In addition, when circulating the cold water from the cooling tower 44 to the temperature control pipe in this way, in other words, when connecting the cold water system to the temperature control pipe, the temperature control pipe is connected to the boiler 20 or the second heat control pipe. It is desirable to be fluidly separated from the hot water system such as the exchanger 33. Switching between the hot water system and the cold water system can be achieved, for example, by opening and closing a damper (not shown).

Further, the refrigerant pipe 42 may further be provided with a damper (not shown) for controlling the flow of refrigerant to the heat storage 43 and/or the cooling tower 44. By opening and closing this damper, it is possible to select whether the refrigerant circulating through the refrigerant pipe 42 is circulated to both the heat storage 43 and the cooling tower 44, or only to one of them.

The control means 2 may be provided in the carbon dioxide-containing gas supply system 1 configured as described above. The control means 2 may be configured integrally with the carbon dioxide-containing gas supply system 1, or may be configured to be able to control the carbon dioxide-containing gas supply system 1 remotely. For example, the control means 2 can individually control the operations of various dampers, air supply means, and circulation means included in the carbon dioxide-containing gas supply system 1. Further, the control means 2 controls various elements of the carbon dioxide-containing gas supply system 1 based on the internal environment (for example, internal temperature, internal humidity, and carbon dioxide concentration) of the greenhouse 10 measured by a measuring means (not shown), for example. It may be configured such that the operation can be controlled and the air volume and temperature of the carbon dioxide-containing gas supplied to the greenhouse 10, the temperature and flow rate of the heating medium, etc. can be changed as appropriate.

Although various exemplary embodiments have been described above, various additions, omissions, substitutions, and changes may be made without being limited to the exemplary embodiments described above. Also, elements from different embodiments may be combined to form other embodiments.

For example, in the above embodiment, the boiler 20 is a hot water boiler that can generate hot water at the same time as exhaust gas (carbon dioxide-containing gas). However, instead of the boiler 20, a device capable of generating and supplying at least carbon dioxide-containing gas may be connected. In this case, instead of circulating the hot water generated by the boiler 20 to the temperature control pipe, the heat medium may be circulated or supplied to the temperature control pipe using another heat medium supply means.

For example, in the above embodiment, heat exchange was performed between the carbon dioxide-containing gas from the boiler 20 and the outside air OA in the first heat exchanger 31, but the heat exchange with the carbon dioxide-containing gas is not necessarily performed with the outside air OA. There's no need to be disappointed. That is, if it is at least lower temperature than the carbon dioxide-containing gas from the boiler 20 and can be used for the heat storage operation of the heat storage tank 32 after heat exchange with the carbon dioxide-containing gas, for example, factory power or other exhaust gas may be used. You can.

For example, in the above embodiment, the external supply pipe 21, which is the supply route for carbon dioxide-containing gas, includes the temperature and humidity adjustment section 30 (first heat exchanger 31) and the temperature adjustment section 40 (third heat exchanger 41). ) are arranged in this order from the upstream side, but it is also possible to arrange the temperature adjustment section 40 upstream of the temperature and humidity adjustment section 30.

For example, in the above embodiment, only one heat storage tank 32 is arranged in the temperature/humidity adjustment section 30, but the number of heat storage tanks 32 can be changed as appropriate depending on the temperature of the carbon dioxide-containing gas supplied from the boiler 20. . At this time, the plurality of heat storage tanks 32 may be connected in series or in parallel to the external supply pipe 21 which is a supply route for carbon dioxide-containing gas.

Furthermore, for example, in the above embodiment, the outside air OA introduced into the heat storage tank 32 is heat-exchanged only with the carbon dioxide-containing gas from the boiler 20, but as shown in FIG. A preheating heat exchanger 50 may be provided upstream of the heat exchanger 31 in the path (outside air introduction pipe 31a).
Prior to heat exchange with the carbon dioxide-containing gas, by performing heat exchange between the heat medium circulating through the temperature control piping and the outside air OA, dry air DA after heat exchange with the carbon dioxide-containing gas introduced into the heat storage tank 32 can be heated to a high temperature, and the heat storage density of the adsorbent M in the heat storage tank 32 can be increased.
In addition, as will be described later, especially during summer operation, the outside air OA introduced into the first heat exchanger 31 can be lowered in temperature by exchanging heat between the outside air OA and cold water as a heat medium circulating through the temperature control piping. This allows the temperature of the carbon dioxide-containing gas supplied to the greenhouse 10 to be lowered.

The carbon dioxide-containing gas supply system 1 according to this embodiment is configured as described above. Next, examples of seasonal and hourly control of the carbon dioxide-containing gas supply system 1 described above will be described with reference to the drawings.

<Example of control during daytime during winter/intermediate period>
FIG. 4 is a schematic diagram showing an example of the operation of the carbon dioxide-containing gas supply system 1 during the daytime during the winter/intermediate period. In addition, in FIG. 4, a black part and a thick line part represent a working part, and a white part and a thin line part represent a non-working part.
In the carbon dioxide-containing gas supply system 1, during the day when crops in the greenhouse 10 perform photosynthesis, the heat storage tank 32 is operated to store heat, and a carbon dioxide-containing gas is supplied into the greenhouse 10.

Specifically, first, fuel is supplied to the boiler 20 and burned to generate carbon dioxide-containing gas and hot water.
The generated carbon dioxide-containing gas is supplied to the greenhouse 10 via the external supply pipe 21 and the internal supply pipe 11, thereby promoting photosynthesis of crops within the greenhouse 10. Note that the carbon dioxide concentration in the greenhouse 10 is desirably controlled to be approximately three times the concentration in the atmosphere (approximately 1000 to 1200 ppm), for example. Excess carbon dioxide-containing gas can be discharged to the outside of the greenhouse 10 via an exhaust pipe (not shown) connected to the external supply pipe 21.
In addition, if the outside temperature is high during the day and there is no need to raise the internal temperature of the greenhouse 10, the generated hot water does not need to be circulated within the greenhouse 10, and the generated hot water is connected to the external temperature control pipe 22. It can be discharged to the outside of the greenhouse 10 through a discharge pipe that is not connected to the greenhouse 10. On the other hand, if it is necessary to heat the inside of the greenhouse 10 when the outside temperature is low, such as on a rainy day, hot water from the boiler 20 may be circulated between the greenhouse 10 and the greenhouse 10 as a heat medium.

Here, high-temperature carbon dioxide-containing gas is discharged from the boiler 20 by combustion of fuel, but if this high-temperature carbon dioxide-containing gas is directly supplied to the greenhouse 10, the internal temperature of the greenhouse 10 will rise excessively. There is a risk of As a result, if the internal temperature of the greenhouse 10 exceeds the appropriate temperature for the crops to be grown, this may cause, for example, a decrease in the photosynthetic ability of the crops or an increase in the amount of respiration, which may result in a decrease in the quality and yield of the crops.

Therefore, in the carbon dioxide-containing gas supply system 1 according to the present embodiment, the temperature and humidity adjustment section 30 is used to lower the temperature of the carbon dioxide-containing gas, and then the carbon dioxide-containing gas is supplied into the greenhouse 10 .

Specifically, the high-temperature carbon dioxide-containing gas discharged from the boiler 20 is transferred to the first heat exchanger 31 of the temperature/humidity adjustment section 30 by the outside air, which is at least lower temperature than the carbon dioxide-containing gas from the boiler 20. Heat is exchanged with OA. The carbon dioxide-containing gas is cooled by heat exchange with the outside air OA.

Then, the carbon dioxide-containing gas cooled by the first heat exchanger 31 is supplied to the greenhouse 10 and is used for photosynthesis of crops.

Note that, if the carbon dioxide-containing gas cooled by the first heat exchanger 31 is not cooled to the extent that it can be supplied to the greenhouse 10, for example, as shown in FIG. The carbon dioxide-containing gas may be further cooled in the heat exchanger 41. The amount of cooling of the carbon dioxide-containing gas by the refrigerant in the third heat exchanger 41, in other words, the temperature of the refrigerant introduced into the third heat exchanger 41 is, for example, the temperature of the first The temperature may be determined based on the difference between the temperature of the carbon dioxide-containing gas after cooling by the heat exchanger 31 and the target temperature of the carbon dioxide-containing gas supplied to the greenhouse 10 (or the internal temperature of the greenhouse 10). The temperature of the refrigerant introduced into the third heat exchanger 41, in other words, the cooling capacity of the refrigerant by the cooling tower 44, can be controlled by the control means 2, for example.

The outside air OA subjected to heat exchange with the high-temperature carbon dioxide-containing gas in the first heat exchanger 31 is heated and dehumidified by such heat exchange, and at least the outside air OA is heated and dehumidified before being introduced into the first heat exchanger 31. The dry air DA is introduced into the heat storage tank 32 as dry air DA, which has a higher temperature and lower humidity than that of the dry air DA.

In the heat storage tank 32, a heat storage operation is performed by introducing dry air DA. Specifically, in the heat storage tank 32, the dampers d1 and d2 (see FIG. 2) corresponding to the outside air introduction pipe 31a and the outside air discharge pipe 31b are opened, and the dampers d3 and d4 corresponding to the outgoing pipe 34 and the returning pipe 35 are closed. . As a result, the dry air DA from the first heat exchanger 31 is sent from the space 32c of the heat storage tank 32 to the filling part 32a, passes through the adsorbent M filled in the filling part 32a, and the dry air DA is The air is also discharged as low-temperature, high-humidity exhaust air from the space 32b through the outside air exhaust pipe 31b. At this time, moisture (adsorbate) is desorbed from the adsorbent M by the high-temperature, low-humidity dry air DA, and the adsorbent M is thereby regenerated, allowing the heat storage tank 32 to perform heat dissipation operation.

When cooling the carbon dioxide-containing gas in the third heat exchanger 41, the refrigerant subjected to heat exchange with the carbon dioxide-containing gas in the third heat exchanger 41 is heated by such heat exchange and then , heat storage 43, and cooling tower 44 in this order.
In the heat storage 43, heat obtained by heat exchange with the carbon dioxide-containing gas is stored in a heat storage material (for example, water) accommodated in the heat storage 43.
In the cooling tower 44, the introduced refrigerant is recooled, and the heat obtained by heat exchange with the carbon dioxide-containing gas is discarded.

Note that if the heat obtained through heat exchange with the carbon dioxide-containing gas is small, the supply of refrigerant to the heat storage 43 may be omitted as appropriate; in this case, the refrigerant from the third heat exchanger is supplied to the cooling tower 44. may only be circulated.

Further, in the carbon dioxide-containing gas supply system 1 according to the present embodiment, there is no need to dehumidify the inside of the greenhouse 10 as described above, and when it is desired to cool the carbon dioxide-containing gas supplied into the greenhouse 10, Instead of cooling the carbon dioxide-containing gas by the first heat exchanger 31 of the temperature/humidity adjustment section 30 shown in FIG. 4, as shown in FIG. 6, only the third heat exchanger 41 of the temperature adjustment section 40 is used. The carbon dioxide-containing gas may be cooled using the following method.
In this case, the refrigerant subjected to heat exchange with the carbon dioxide-containing gas in the third heat exchanger 41 is heated by such heat exchange and then circulated to the heat storage 43. The heat obtained through heat exchange with the contained gas is stored in a heat storage material (for example, water).
Cooling of the carbon dioxide-containing gas using only the third heat exchanger 41 of the temperature adjustment section 40 is performed, for example, in a state where sufficient heat is stored in the adsorbent M in the heat storage tank 32.

According to the present embodiment, by providing the temperature and humidity adjustment unit 30 on the supply path (external supply pipe 21) of carbon dioxide-containing gas from the boiler 20 to the greenhouse 10, the carbon dioxide before being supplied to the greenhouse 10 is Cooling the carbon-containing gas. This prevents the internal temperature of the greenhouse 10 from rising excessively due to the supply of carbon dioxide-containing gas, and as a result, it is possible to suppress a decrease in the quality and yield of crops.

Further, according to the present invention, the outside air OA heated by heat exchange with the carbon dioxide-containing gas is used for heat storage operation of the heat storage tank 32 containing the adsorbent M, that is, for desorption of adsorbate from the adsorbent M. .
Conventionally, heat obtained from carbon dioxide-containing gas has been stored in a heat storage material, for example, in the heat storage 43, but in this case, there has been a problem that heat radiation loss occurs over time.
In this regard, in the present invention, the heat obtained from the carbon dioxide-containing gas is stored in the form of desorption of the adsorbate from the adsorbent M, thereby eliminating the conventional heat radiation loss and providing long-term storage over time and seasons. It is possible to store heat. Furthermore, by selecting a material with a large heat storage density as the adsorbent M accommodated in the heat storage tank 32, more heat can be stored from the carbon dioxide-containing gas than in the past.

Furthermore, according to the present embodiment, by further providing the temperature adjustment section 40 on the supply path (external supply pipe 21) of the carbon dioxide-containing gas, for example, when the temperature and humidity adjustment section 30 cannot sufficiently cool the carbon dioxide-containing gas, Alternatively, even after heat storage in the adsorbent M accommodated in the heat storage tank 32 has completely progressed, the carbon dioxide-containing gas before being supplied to the greenhouse 10 can be appropriately cooled.

<Example of control at night during winter/intermediate season>
FIG. 7 is a schematic diagram showing an example of the operation of the carbon dioxide-containing gas supply system 1 at night during the winter/intermediate period. In the carbon dioxide-containing gas supply system 1, at night when the crops in the greenhouse 10 do not perform photosynthesis, the heat storage tank 32 operates to dehumidify the greenhouse 10 and supply heat to the greenhouse 10.

Here, at night when the crops do not perform photosynthesis, inside the greenhouse 10, the internal temperature decreases as the outside temperature decreases, and the humidity increases as the crops respire. As described above, if the internal humidity of the greenhouse 10 increases excessively, it may affect the respiration of crops or cause the propagation of pests and pathogenic bacteria, for example.

Therefore, in this embodiment, first, the supply of fuel to the boiler 20 is stopped, and the supply of carbon dioxide-containing gas and hot water from the boiler 20 to the greenhouse 10 is stopped.
Next, the air supply means 34a of the outgoing pipe 34 is activated, and the humid air RA with increased humidity in the greenhouse 10 is introduced into the heat storage tank 32 through the outgoing pipe 34.

In the heat storage tank 32, heat radiation operation is performed by introducing humid air RA. Specifically, in the heat storage tank 32, the dampers d1 and d2 corresponding to the outside air introduction pipe 31a and the outside air discharge pipe 31b are closed, and the dampers d3 and d4 corresponding to the outgoing pipe 34 and the returning pipe 35 are opened. As a result, the humid air RA from the air supply means 34a is sent from the space 32b of the heat storage tank 32 to the filling part 32a, and passes through the adsorbent M filled in the filling part 32a. At this time, the moisture (adsorbate) in the humid air RA is adsorbed by the adsorbent M, and the adsorbent M generates heat, and the air is transferred from the space 32c to the return pipe 35 as the low-humidity air SA, which is higher in temperature and lower in humidity than the humid air RA. is derived. As a result, the adsorbent M is dried, and in the heat storage tank 32, a heat storage operation is possible by again introducing dry air DA from the outside air introduction pipe 31a.

The high temperature, low humidity air SA led out from the heat storage tank 32 is then introduced into the second heat exchanger 33. As described above, if high temperature air is introduced into the greenhouse 10 and the internal temperature rises excessively, this may have an adverse effect on crops.
Therefore, in the temperature and humidity adjustment unit 30 according to the present embodiment, the high-temperature, low-humidity air SA derived from the heat storage tank 32 is cooled by heat exchange with the heat medium circulating through the temperature control piping, and after lowering the temperature, 10.

The heat medium subjected to heat exchange with the high-temperature, low-humidity air SA in the second heat exchanger 33 is heated by such heat exchange, thereby generating hot water. Next, the hot water generated by heat exchange with the low-humidity air SA is introduced into the internal temperature control pipe 12 via the branch pipe 22b and the external temperature control pipe 22, and is used to control the temperature of the greenhouse 10.

The hot water introduced into the internal temperature control pipe 12 may flow through the internal temperature control pipe 12 to adjust the inside of the greenhouse 10 from underground, or may be used to supply heat for temperature control via the branch pipe 12a. By being introduced into the exchanger 13, the temperature may be adjusted by heat exchange with the indoor air of the greenhouse 10.
Note that when there is no need to increase the internal temperature of the greenhouse 10, that is, when the inside of the greenhouse 10 is sufficiently warm, the generated hot water is discharged into the greenhouse via a discharge pipe (not shown) connected to the external temperature control pipe 22. 10 can be discharged to the outside.
On the other hand, when it is necessary to further increase the internal temperature of the greenhouse 10, that is, when sufficient temperature control effect of the greenhouse 10 cannot be obtained only by the heat dissipation operation of the heat storage tank 32 of the greenhouse 10, the temperature is stored in the heat storage 43. The generated heat may be used to further heat the heat medium flowing through the temperature control pipe.

According to this embodiment, the heat storage tank 32, which has been subjected to heat storage operation during the day using high temperature carbon dioxide-containing gas that is exhaust gas from the boiler 20, is caused to perform heat dissipation operation using humid air RA in the greenhouse 10. The humid air RA subjected to the heat dissipation operation of the heat storage tank 32 is heated and dehumidified by the heat dissipation of the adsorbent M housed in the heat storage tank 32, and is returned into the greenhouse 10 as low humidity air SA. As a result, the air within the greenhouse 10 is ventilated from high humidity air RA to low humidity air SA, and as a result, the absolute humidity within the greenhouse 10 can be reduced.

Further, according to the present embodiment, the heat generated by the heat dissipation operation of the heat storage tank 32 is used to heat the heat medium circulating through the temperature control piping by heat exchange with the high temperature, low humidity air SA. Thereby, the temperature inside the greenhouse 10 can be adjusted at night by using the heat obtained from the carbon dioxide-containing gas during the day.

According to this embodiment, the boiler 20 is not operated at night, and only the heat stored in the adsorbent M during the daytime heat storage operation is used for temperature control (hot water supply) in the greenhouse 10. In addition, humidity control (dehumidification) can be further performed. Furthermore, since it is not necessary to operate the boiler 20 at night, the amount of fuel used in the boiler 20 can be reduced compared to the conventional method.

<Example of control during daytime in summer>
Next, an example of controlling the carbon dioxide-containing gas supply system 1 in summer will be described. FIG. 8 is a schematic diagram showing an example of the operation of the carbon dioxide-containing gas supply system 1 during the daytime in summer. In addition, in the following description of the control example for the summer period, detailed description of control that is substantially the same as that for the winter/intermediate period will be omitted.

First, fuel is supplied to the boiler 20 and burned to generate carbon dioxide-containing gas.
The generated carbon dioxide-containing gas is supplied to the greenhouse 10 via the external supply pipe 21 and the internal supply pipe 11, thereby promoting photosynthesis of crops within the greenhouse 10. At this time, since the carbon dioxide-containing gas generated in the boiler 20 is at a high temperature, the temperature and humidity adjustment section 30 is used to lower the temperature of the carbon dioxide-containing gas, and then the greenhouse is heated. The carbon dioxide-containing gas is supplied into 10.
In addition, the outside air OA subjected to heat exchange with the high temperature carbon dioxide-containing gas in the first heat exchanger 31 is heated and dehumidified by such heat exchange, and is used for heat storage operation of the heat storage tank 32.

Note that during summer operation, the outside temperature is high and there is no need to circulate hot water within the greenhouse 10. Therefore, the hot water generated in the boiler 20 can be discharged to the outside of the greenhouse 10 via a discharge pipe (not shown) connected to the external temperature control pipe 22.
In addition, during such summer operation, even if hot water is not circulated as a heat medium in the greenhouse 10 as described above, the indoor temperature of the greenhouse 10 may be lower than the appropriate temperature for the crops to be grown due to the outside temperature. There is a risk that it will be exceeded.
Therefore, during summer operation of the carbon dioxide-containing gas supply system 1 according to the present embodiment, instead of the hot water from the boiler 20, cold water from the cooling tower 44 is circulated as a heat medium through the temperature control piping. Connection switching between the hot water system including the boiler 20 and the cold water system including the cooling tower 44 can be performed by opening and closing a damper (not shown) as described above.

According to this embodiment, even during summer operation of the carbon dioxide-containing gas supply system 1, carbon dioxide-containing gas can be supplied to the greenhouse 10 to promote photosynthesis of crops in the same way as during winter/intermediate operation. Further, at this time, the heat storage tank 32 can be appropriately operated for heat storage by the outside air OA heated by heat exchange with the carbon dioxide-containing gas.

Further, during summer operation according to the present embodiment, instead of hot water from the boiler 20, cold water from the cooling tower 44 is circulated as a heat medium through the temperature control piping. Thereby, the temperature inside the greenhouse 10 can be lowered even during summer operation when the outside temperature is high, and the temperature can be appropriately maintained at the appropriate temperature for the crops.

As described above, during summer operation of the carbon dioxide-containing gas supply system 1, there is no need to circulate hot water as a heat medium through the greenhouse 10 (internal temperature control pipe 12). In other words, there is no need to heat the heat medium circulating through the temperature control piping.
From this point of view, in consideration of the heat radiation loss in the heat storage 43 described above, during summer operation, the refrigerant circulating through the refrigerant pipes 42 of the temperature adjustment section 40 is not supplied to the heat storage 43, but is circulated only to the cooling tower 44. You may also do so. The circulation path of the refrigerant in the temperature adjustment section 40 can be controlled by the opening/closing operation of the damper (not shown) as described above.

Although not shown, if the carbon dioxide-containing gas cooled by the first heat exchanger 31 has not been cooled to the extent that it can be supplied to the greenhouse 10, for example, as in the example shown in FIG. The carbon dioxide-containing gas from the boiler 20 may be further cooled in the third heat exchanger 41 of the temperature adjustment section 40.

<Example of control at night in summer>
FIG. 9 is a schematic diagram showing an example of the operation of the carbon dioxide-containing gas supply system 1 at night in summer. In addition, in the following description of the control example for the summer period, detailed description of control that is substantially the same as that for the winter/intermediate period will be omitted.

First, the supply of fuel to the boiler 20 is stopped, and the supply of carbon dioxide-containing gas to the greenhouse 10 is stopped.
Next, the air supply means 34a of the outgoing pipe 34 is activated to introduce humid air RA with increased humidity from the greenhouse 10 into the heat storage tank 32 through the outgoing pipe 34. In the heat storage tank 32, heat dissipation operation proceeds with the humid air RA from the greenhouse 10.
The low-humidity air SA heated and dehumidified by the heat dissipation operation of the heat storage tank 32 is cooled by heat exchange with the heat medium circulating through the temperature control piping in the second heat exchanger 33, and is returned to the greenhouse 10.

Here, even during nighttime operation in the summer, hot water is generated by heat exchange with the low-humidity air SA in the second heat exchanger 33, but as described above, in the summer, the greenhouse 10 There is a risk that the indoor temperature may exceed the appropriate temperature for the crops being grown.
Therefore, in the same way as the above-mentioned daytime operation in summer, during nighttime operation in summer, cold water from the cooling tower 44 is circulated through the temperature control piping as a heat medium instead of hot water from the boiler 20, and this cold water is used as a heat medium. , and the greenhouse 10 may also be cooled.

According to this embodiment, when the carbon dioxide-containing gas supply system 1 is operated at night during the summer season, the air in the greenhouse 10 is changed from high-humidity air RA to low-humidity air by the heat dissipation operation of the heat storage tank 32, similarly to the night-time operation during the winter/intermediate period. Ventilation can be performed to the air SA, and as a result, the absolute humidity inside the greenhouse 10 can be reduced.

Further, according to the present embodiment, like the daytime operation, cold water from the cooling tower 44 is circulated through the temperature control pipe instead of hot water from the boiler 20. Thereby, the temperature inside the greenhouse 10 can be lowered even during summer operation when the outside temperature is high, and the temperature can be appropriately maintained at the appropriate temperature for the crops.

Further, according to the present embodiment, the humidity control (dehumidification) in the greenhouse 10 is performed using only the heat stored in the adsorbent M during the daytime heat storage operation without operating the boiler 20 at night. In addition, the amount of fuel used in the boiler 20 can be reduced compared to the conventional method.

INDUSTRIAL APPLICABILITY The present invention is useful for a carbon dioxide-containing gas supply system used for controlling temperature and humidity in a greenhouse in greenhouse horticulture.
However, the application of the carbon dioxide-containing gas supply system 1 according to the present invention is not limited to the above-mentioned greenhouse in greenhouse horticulture, but can be applied to various demand units that utilize carbon dioxide-containing gas for various purposes. Examples of ways to use carbon dioxide-containing gas include, in addition to the above-mentioned agricultural uses, algae cultivation, chemical products (microbial reactions, methanation), oxygen and formic acid (artificial photosynthesis), and concrete production. Possible uses include dry ice production, arc welding, etc.
That is, the carbon dioxide-containing gas supply system according to the present invention is applicable to greenhouses in greenhouse horticulture, chemical plants, chemical experiment facilities, artificial photosynthesis facilities, concrete manufacturing facilities, dry ice manufacturing facilities, and arc welding as demand parts for carbon dioxide-containing gas. It is also useful in the field.

1 Carbon dioxide-containing gas supply system 2 Control means 10 Greenhouse 20 Boiler 30 Temperature and humidity adjustment section 31 First heat exchanger 32 Heat storage tank 33 Second heat exchanger 34 Outbound pipe 35 Return pipe 40 Temperature adjustment section 41 Third Heat exchanger 43 Heat storage 44 Cooling tower 50 Preheating heat exchanger DA Dry air M Adsorbent OA Outside air RA Humid air SA Low humidity air

Claims (12)

A carbon dioxide-containing gas supply system to a demand unit for carbon dioxide-containing gas, the system comprising:
a boiler that generates carbon dioxide-containing gas to be supplied to the demand unit by burning fuel;
a heat exchanger that cools the carbon dioxide-containing gas before being supplied to the demand unit by heat exchange with introduced outside air;
a heat storage tank configured to be capable of repeating heat storage operation and heat release operation by adsorption and desorption of adsorbate to the adsorbent contained therein;
an outgoing pipe that supplies indoor air to be treated from the demand unit to the heat storage tank;
a return pipe that supplies the indoor air dehumidified by the heat dissipation operation in the heat storage tank from the heat storage tank to the demand section;
The heat storage tank is
Performing the heat storage operation by introducing the outside air heated by heat exchange with the carbon dioxide-containing gas in the heat exchanger,
A carbon dioxide-containing gas supply system, characterized in that the heat dissipation operation is performed by introducing the indoor air supplied from the demand section. The carbon dioxide-containing gas supply system according to claim 1, further comprising temperature control piping for adjusting the room temperature in the demand section. The carbon dioxide-containing gas supply system according to claim 2, wherein hot water generated by the boiler is made to flow through the temperature control piping as a heat medium. According to claim 2 or 3, further comprising a second heat exchanger that heats the heat medium flowing through the temperature control pipe by heat exchange with indoor air after being dehumidified by the heat dissipation operation. A carbon dioxide-containing gas supply system as described. characterized by comprising a preheating heat exchanger that heats the outside air before heat exchange with the carbon dioxide-containing gas in the heat exchanger by heat exchange with a heat medium flowing through the temperature control pipe; The carbon dioxide-containing gas supply system according to claim 2 or 3. a heat storage tank for storing heat obtained from the carbon dioxide-containing gas;
a cooling tower for cooling the carbon dioxide-containing gas;
a third heat exchanger that cools the carbon dioxide-containing gas before being supplied to the demand section by heat exchange with a refrigerant circulated between at least one of the heat storage tank and the cooling tower; The carbon dioxide-containing gas supply system according to claim 1, comprising: a carbon dioxide-containing gas supply system according to claim 1; The carbon dioxide-containing gas supply system according to claim 6, wherein the third heat exchanger is arranged downstream of the heat exchanger in the supply route of the carbon dioxide-containing gas. Equipped with temperature control piping for adjusting the room temperature in the demand section,
The carbon dioxide-containing gas supply system according to claim 6 or 7, characterized in that cold water generated in the cooling tower is made to flow through the temperature control piping as a heat medium. Equipped with temperature control piping for adjusting the room temperature in the demand section,
8. The carbon dioxide-containing gas supply system according to claim 6, wherein hot water generated in the heat storage tank is passed through the temperature control piping as a heat medium. Measuring means for measuring carbon dioxide concentration and temperature/humidity in the demand section;
further comprising a control means;
The carbon dioxide-containing gas supply according to claim 1, wherein the control means controls the air volume and temperature/humidity of the carbon dioxide-containing gas introduced into the demand section based on the measurement result by the measuring means. system. A method for supplying carbon dioxide-containing gas to a demand unit for carbon dioxide-containing gas, the method comprising:
producing carbon dioxide-containing gas by burning fuel;
cooling the carbon dioxide-containing gas before being supplied to the demand unit by heat exchange with the introduced outside air;
supplying the carbon dioxide-containing gas cooled by the heat exchange into the demand section;
introducing the outside air heated by heat exchange with the carbon dioxide-containing gas into a heat storage tank containing an adsorbent and performing a heat storage operation of the heat storage tank;
a step of introducing indoor air from the demand unit into the heat storage tank and performing heat dissipation operation of the heat storage tank;
A carbon dioxide-containing gas supply method comprising the step of supplying the indoor air dehumidified by the heat dissipation operation into the demand unit. further comprising the step of measuring carbon dioxide concentration and temperature/humidity in the demand section,
The carbon dioxide containing gas according to claim 11, characterized in that the air volume and temperature and humidity of the carbon dioxide-containing gas introduced into the demand section are determined based on the measured carbon dioxide concentration and temperature and humidity in the demand section. Gas supply method.

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