Carbon dioxide supply and dehydration / heating system in horticultural facility

Abstract

To provide a system that can collectively perform the following three: performing recovery / supply of carbon dioxide by using combustion exhaust gas; performing dehydration / heating in horticultural facility; and efficiently heating and regenerating both a dehumidifying material necessary for dehumidifying the combustion exhaust gas and a dehumidifying material necessary for dehydration / heating the inside of horticultural facility by using exhaust heat from a burner.SOLUTION: Recovery / supply of carbon dioxide is performed by using combustion exhaust gas, dried low dew point air after carbon dioxide is recovered from the combustion exhaust gas is heated by exhaust heat from a burner, regeneration of a dehumidifying material necessary for carbon dioxide recovery is performed by using the heated air, and regeneration of a dehumidifying material used for dehydrating / heating the inside of a horticultural facility is performed by using exhaust heat having a lower temperature than the exhaust heat used in regenerating the dehumidifying material.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a carbon dioxide supply and dehumidification / warming system in a horticultural facility, and particularly to a carbon dioxide supply and dehumidification / warming system in a horticultural facility that utilizes exhaust gas and exhaust heat generated by a combustion machine.

Background Art

[0002] In protected horticulture cultivation, since the application of carbon dioxide promotes photosynthesis and is expected to increase the yield of crops and the like, it is desirable to recover and utilize carbon dioxide from the exhaust gas generated by the combustion machine used for heating in the horticultural facility. At the same time, since the soaring fuel costs are squeezing the management of farmers, the utilization of the heat discharged from the combustion machine is expected. In addition, in protected horticulture cultivation, when dew condensation occurs, diseases such as gray mold occur, causing considerable damage. Therefore, there are many needs for dehumidification inside the horticultural facility at night.

[0003] Among the above backgrounds, a method has been devised to recover carbon dioxide from the exhaust gas (hereinafter referred to as "combustion exhaust gas") generated by the combustion machine used for heating in the horticultural facility using an adsorbent that adsorbs and desorbs carbon dioxide and supply it into the horticultural facility. For example, in Patent Document 1, in a method of recovering and supplying carbon dioxide from combustion exhaust gas using an adsorbent, since the presence of water vapor affects the amount of carbon dioxide recovered, the combustion exhaust gas cooled by outside air is dehumidified by a desiccant air conditioner or the like, and then the low dew point air obtained by dehumidifying using a dehumidifying material such as zeolite is blown into a tank storing the carbon dioxide adsorbent (

[0019] ). Further, it is also described in the same patent document that zeolite is preferably used as an adsorbent for adsorbing and desorbing carbon dioxide (

[0020] ). In Patent Document 2, combustion exhaust gas is dehumidified in a dehumidification tower containing zeolite, and then carbon dioxide is adsorbed and recovered in a storage tower containing zeolite, and the recovered carbon dioxide is supplied into a horticultural facility. At the same time, a system is devised in which each of the zeolites is heated and regenerated by heaters installed in the dehumidification tower and the storage tower. However, none of these have developed a system that utilizes waste heat from a combustion engine.

[0004] Regarding the above-mentioned method for dehumidifying a horticultural facility at night, in Patent Document 3, high-humidity air in the horticultural facility is sent into a dehumidifying material (water vapor adsorbent), and water vapor is adsorbed by the dehumidifying material. At the same time, air heated by the heat generated during adsorption is sent into the horticultural facility, so that dehumidification and heating (hereinafter referred to as "dehumidification / heating") of the horticultural facility are performed simultaneously. In this system, it has been proposed to utilize waste heat from a heater (combustion engine) to heat and regenerate the dehumidifying material used for dehumidification. Further, in the same patent document, as the dehumidifying material, it is preferable to use one having a large water vapor adsorption amount and capable of adsorbing in a wide humidity range. As such an adsorbent, an amorphous aluminum silicate or an aluminum silicate composite composed of a low-crystalline layered clay mineral and an amorphous aluminum silicate is used (see

[0015] ). However, in the system described in Patent Document 3, a system that adds the use of carbon dioxide in combustion exhaust gas and supplies it into a horticultural facility has not been developed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0006] As described above, in facility horticulture cultivation, a system having three elements that can utilize carbon dioxide in combustion exhaust gas, dehumidify the inside of the horticultural facility, and utilize the exhaust heat from the combustion machine is required.

[0007] Specifically, in a horticultural facility, carbon dioxide application is carried out during the day, but at night, while recovering carbon dioxide from the combustion exhaust gas, it is necessary to dehumidify and warm the inside of the horticultural facility. Furthermore, it is required to efficiently regenerate the dehumidifying material necessary for carbon dioxide recovery and the dehumidifying material necessary for dehumidifying and warming the inside of the horticultural facility using the heat discharged from the combustion machine at night.

[0008] However, as described above, although systems for supplying carbon dioxide in combustion exhaust gas into a horticultural facility and systems for dehumidifying and warming the inside of a horticultural facility have already been proposed, a system equipped with both has not been proposed. In addition, there are problems in efficiently performing both the regeneration of the dehumidifying material necessary for carbon dioxide recovery and the regeneration of the dehumidifying material necessary for dehumidifying and warming the inside of the horticultural facility using the exhaust heat from the combustion machine.

[0009] The present invention has been made in view of the above situation, and aims to provide a system that can collectively perform three operations: recovering and supplying carbon dioxide using combustion exhaust gas, dehumidifying and warming the inside of a horticultural facility, and efficiently heating and regenerating both the dehumidifying material necessary for dehumidifying the combustion exhaust gas and the dehumidifying material necessary for dehumidifying and warming the inside of the horticultural facility using the exhaust heat from the combustion machine. In the above system, zeolite is used as an adsorbent for carbon dioxide recovery and supply, and for dehumidification and heating in a horticultural facility, an amorphous aluminum silicate or an aluminum silicate composite composed of a low-crystalline layered clay mineral and an amorphous aluminum silicate is used as a dehumidifying material (water vapor adsorbent). The object is to provide a system that more efficiently regenerates both the dehumidifying material required for dehumidifying the combustion exhaust gas and the dehumidifying material required for dehumidification and heating in a horticultural facility using the exhaust heat from a combustion machine.

Means for Solving the Problems

[0010] As a result of investigations to achieve the above object, the present inventors heated the dry low dew point air after recovering carbon dioxide from the combustion exhaust gas with the exhaust heat from a combustion machine, and used this heated air to regenerate the dehumidifying material required for carbon dioxide recovery. Also, the dehumidifying material used for dehumidification and heating in a horticultural facility is regenerated using exhaust heat at a lower temperature than the exhaust heat used for regenerating the dehumidifying material, thereby enabling carbon dioxide recovery and supply, dehumidification and heating in a horticultural facility, and utilization of the exhaust heat from a combustion machine to be carried out in a lump sum. Also, it was found that the dehumidification of the combustion exhaust gas can be carried out in two stages: upstream dehumidification using an amorphous aluminum silicate or an aluminum silicate composite composed of a low-crystalline layered clay mineral and an amorphous aluminum silicate as the dehumidifying material, and downstream dehumidification using zeolite as the dehumidifying material, so that the exhaust heat from the combustion machine can be efficiently utilized.

[0011] The present invention has been completed based on these findings, and the present invention for solving the above problems is as follows. [1] After dehumidifying the combustion exhaust gas cooled to near the outside air temperature, carbon dioxide in the combustion exhaust gas is adsorbed and recovered by an adsorbent, and the dry low dew point air after recovering the carbon dioxide is heated by the exhaust heat from the combustion machine, and the dehumidifying material used in the dehumidifying step is regenerated using the heated air, and the recovered carbon dioxide is supplied to a horticultural facility by sending air having a lower carbon dioxide concentration than the combustion exhaust gas to the adsorbent, a carbon dioxide recovery and supply step, and, By sending the high humidity air in the horticultural facility to a dehumidifying material, dehumidified and heated air is supplied into the horticultural facility, and regeneration of the dehumidifying material used for dehumidification and heating is performed by using exhaust heat at a lower temperature than the exhaust heat used for regenerating the dehumidifying material in the carbon dioxide recovery step, a dehumidification and heating step in the horticultural facility A carbon dioxide recovery, supply, dehumidification, and heating system in a horticultural facility, including [2] Using zeolite as the adsorbent, and using an amorphous aluminum silicate or an aluminum silicate composite composed of a low crystalline layered clay mineral and an amorphous aluminum silicate as the dehumidifying material used for dehumidification and heating, the carbon dioxide recovery, supply, dehumidification, and heating system in the horticultural facility according to [1]. [3] Performing the dehumidification of the combustion exhaust gas in two stages, upstream dehumidification using an amorphous aluminum silicate or an aluminum silicate composite composed of a low crystalline layered clay mineral and an amorphous aluminum silicate as the dehumidifying material, and downstream dehumidification using zeolite as the dehumidifying material, the carbon dioxide supply, dehumidification, and heating system in the horticultural facility according to [1] or [2].

Effect of the Invention

[0012] According to the present invention, it is possible to recover and supply carbon dioxide necessary for promoting photosynthesis in facility horticulture cultivation using combustion exhaust gas, and to dehumidify and heat the inside of the horticultural facility, and by using the exhaust heat from the combustion machine, both the dehumidifying material necessary for dehumidifying the combustion exhaust gas and the dehumidifying material necessary for dehumidifying and heating the inside of the horticultural facility can be efficiently regenerated.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Embodiments for Carrying Out the Invention

[0014] Hereinafter, the carbon dioxide supply and dehumidification / warming system in the embodiments of the present invention (hereinafter referred to as "the present embodiment") will be described, but the present invention is not limited to the following embodiments.

[0015] The carbon dioxide supply and dehumidification / warming system in the greenhouse of the present embodiment includes the following steps (I) and (II). (I) After dehumidifying the combustion exhaust gas cooled to near the outside air temperature, the carbon dioxide in the combustion exhaust gas is adsorbed and recovered by an adsorbent, and the low dew-point air after recovering the carbon dioxide is heated by the exhaust heat from the burner. The dehumidifying material used in the dehumidification process is regenerated using the heated air, and the recovered carbon dioxide is supplied to the horticultural facility by sending air with a lower carbon dioxide concentration than the combustion exhaust gas to the adsorbent. Carbon dioxide recovery / supply process. (II) The high-humidity air in the horticultural facility is sent to the dehumidifying material to supply dehumidified and heated air into the horticultural facility, and the regeneration of the dehumidifying material used for dehumidification and heating is carried out by using exhaust heat at a lower temperature than the exhaust heat used for regenerating the dehumidifying material in the carbon dioxide recovery process. Dehumidification / warming process in the horticultural facility.

[0016] <Cooling and dehumidification of combustion exhaust gas> In the carbon dioxide supply and dehumidification / warming system in the horticultural facility according to this embodiment, since carbon dioxide is recovered from the combustion exhaust gas using an adsorbent, the high-temperature combustion exhaust gas is cooled to near the outside air temperature and then the combustion exhaust gas is dehumidified. The cooling of the combustion exhaust gas is performed by cooling water, outside air, etc. using a heat exchanger, and the combustion exhaust gas is cooled to near the outside air temperature, for example, until it reaches a temperature of outside air temperature + 30°C or lower, preferably until it reaches a temperature of outside air temperature + 10°C or lower. Also, the dehumidification of the combustion exhaust gas is performed using a dehumidifying material.

[0017] <Adsorbent used in the carbon dioxide recovery / supply process> As an adsorbent for adsorbing and desorbing carbon dioxide used in the carbon dioxide recovery / supply process, there is no particular limitation as long as it has a large adsorption amount of carbon dioxide in exhaust gas with a carbon dioxide concentration of about 10 vol% and can release carbon dioxide in outside air with a carbon dioxide concentration of about 0.04 vol%, but zeolite, especially synthetic zeolite, is suitable.

[0018] <Dehumidifying material used for dehumidifying combustion exhaust gas> In the carbon dioxide recovery / supply process, the combustion exhaust gas cooled to near the outside air temperature is dehumidified, and the dehumidifying material used for dehumidification is regenerated using the exhaust heat from the combustion machine. Therefore, the dehumidifying material used for dehumidifying the combustion exhaust gas can adsorb water vapor at a temperature close to the outside air and can be dried with exhaust heat without any problem. Specifically, aluminum silicate, and the above-mentioned zeolite, etc. may be mentioned. Here, the aluminum silicate referred to is an amorphous aluminum silicate or an aluminum silicate composite composed of a low-crystalline layered clay mineral and an amorphous aluminum silicate.

[0019] The combustion exhaust gas dehumidified by this dehumidifying material is sent to an adsorbent that adsorbs and desorbs carbon dioxide. Since the presence of water vapor affects the amount of carbon dioxide adsorbed (recovered), it is preferable to prevent moisture from being brought into the adsorbent. For this purpose, it is preferable to use the same dehumidifying material for dehumidifying the combustion exhaust gas as the carbon dioxide adsorbent used for adsorbing the combustion exhaust gas. Specifically, it is preferable to use zeolite, which is the above-mentioned preferable adsorbent.

[0020] On the other hand, in this embodiment, since the waste heat of the combustion exhaust gas is used for regenerating the dehumidifying material used for dehumidifying the exhaust gas, a dehumidifying material that can be efficiently regenerated is suitable. Table 1 below shows the regeneration rates of an aluminosilicate composite (manufactured by Ishihara Sangyo Co., Ltd., Haskrei GI-Z) composed of a low-crystalline layered clay mineral and an amorphous aluminosilicate, and a synthetic zeolite (manufactured by Union Showa Co., Ltd., Zeolite 13X). The regeneration rate is shown as the moisture desorption rate by adsorbing water vapor for 24 hours at 25°C and 90% RH for each 1 g of each sample, then heating and drying at each temperature and measuring the mass over time.

[0021]

Table 1

[0022] As shown in this table, it can be said that an aluminosilicate that can be dried at a lower temperature than zeolite is suitable for the dehumidifying material from the viewpoint of efficient regeneration. Therefore, in this embodiment, the combustion exhaust gas is dehumidified in two stages. On the upstream side, an aluminosilicate that can be dried at a low temperature and has a large dehumidification amount is used to enable more efficient regeneration at a lower temperature. At the same time, it is preferable to use zeolite for the downstream dehumidifying material to prevent moisture from being brought into the adsorbent. The zeolite used for the downstream dehumidifying material is preferably of the same type as the zeolite used for the adsorbent, but different types, for example, zeolites with high water vapor adsorption selectivity, may also be used. In this case, however, since the heat generation amount during dehumidification increases and the temperature of the exhaust gas further rises, it is necessary to note that the carbon dioxide adsorption amount in the adsorbent decreases.

[0023] <Dehumidifying material used in the dehumidification and heating process> The dehumidifying material used in the dehumidification and heating process is not particularly limited as long as it is an adsorbent that adsorbs water vapor and generates heat. However, it is preferably an adsorbent that has a large amount of water vapor adsorption and desorption and can adsorb in a wide humidity range to cope with various humidity conditions. Examples of such adsorbents include amorphous aluminum silicate, composites of low-crystalline layered clay minerals and amorphous aluminum silicate, etc. Adsorbents such as silica gel and alumina gel can also be used for dehumidification and heating. These adsorbents may be used alone or in combination.

[0024] <Regeneration of dehumidifying material using exhaust heat> In this embodiment, the heat discharged from the combustion machine at night is used to regenerate both the dehumidifying material required for carbon dioxide recovery and the dehumidifying material required for dehumidification in the horticultural facility. As described above, in the recovery of carbon dioxide using an adsorbent that adsorbs and desorbs carbon dioxide, since the presence of water vapor affects the carbon dioxide adsorption (recovery) amount, in the regeneration of the dehumidifying material used for dehumidification from the combustion exhaust gas, it is desirable to remove water vapor as much as possible, and it is preferable to use air drier than the outside air as the air used for regeneration. Therefore, in the present invention, the dry low dew point air after recovering carbon dioxide from the combustion exhaust gas is used, the air is heated by the exhaust heat from the combustion machine, and the heated air is used to regenerate the dehumidifying material required for carbon dioxide recovery. On the other hand, in the heating and dehumidification process in the horticultural facility, since the adsorption and desorption of water vapor by the dehumidifying material are repeated, it does not require the degree of dryness required in the regeneration of the dehumidifying material required for the above-mentioned carbon dioxide recovery. Therefore, in the present embodiment, as described above, after regenerating the dehumidifying material required for carbon dioxide recovery using the exhaust heat from the combustion machine, the exhaust heat at a temperature lower than the exhaust heat used for regenerating the dehumidifying material is utilized to regenerate the dehumidifying material required for dehumidification within the horticultural facility, thereby efficiently drying both dehumidifying materials.

[0025] Hereinafter, each step of the present embodiment will be described with reference to FIG. 1 showing the carbon dioxide recovery step and the dehumidification / warming step at night A, FIG. 2 showing the carbon dioxide supply step during the day A, FIG. 3 showing the carbon dioxide recovery step and the dehumidification / warming step at night B on the day following night A, and FIG. 4 showing the carbon dioxide supply step during the day B on the day following day A. Each step shall be repeated in the order of night A, day A, night B, and day B. In each figure, "horticultural facility" is denoted as "house", and elements common among multiple drawings are given the same reference numerals, omitting repeated detailed descriptions of those elements.

[0026] <Carbon Dioxide Recovery and Supply Step> In the present embodiment, when the combustion machine is operating at night using the adsorbent and dehumidifying material described above, two systems of lines are simultaneously operating: a line for adsorbing and storing carbon dioxide from the combustion exhaust gas dehumidified using the dehumidifying material, and a line for releasing and regenerating the water vapor adsorbed during dehumidification from the dehumidifying material. In addition, as the dry air for releasing the adsorbed water vapor from the dehumidifying material, the dry low dew point air after recovering and storing carbon dioxide from the combustion exhaust gas after dehumidification is heated by heat exchange with the high-temperature exhaust gas in another line and then used. This enables a higher degree of dryness and regeneration in a shorter time compared to using outside air or the like for regeneration.

[0027] FIG. 1 is a diagram showing an example of the carbon dioxide recovery step and the dehumidification / warming step at night A. In the figure, 1 is the exhaust gas inlet, 2 is the exhaust gas outlet, 3 is the outside air inlet, 4 is the outside air outlet, 5 is the indoor air inlet of the house, 6 is the indoor air outlet of the house, 7 is the outside air inlet, 8 is the indoor air outlet of the house, 11 is the heat exchanger A, 12 is the heat exchanger B, 13 is the heat exchanger C, 21 is the fan A, 22 is the fan B, 23 is the fan C, 24 is the fan D, 25 is the fan E, 31 is the dehumidification tower A1, 32 is the dehumidification tower A2, 33 is the dehumidification tower B1, 34 is the dehumidification tower B2, 35 is the adsorption tower, 36 is the dehumidification tower X1, and 37 is the dehumidification tower Y1.

[0028] (Recovery of carbon dioxide) In this embodiment, the recovery of carbon dioxide is as described below. High-temperature exhaust gas containing carbon dioxide is cooled to near the outside air temperature through three heat exchangers, and after two-stage dehumidification, carbon dioxide is recovered in the adsorption tower. That is, the exhaust gas introduced from the exhaust gas inlet (1) is attracted by the fan A (21) and exchanges heat with the low dew-point air that has passed through the adsorption tower (35) in the heat exchanger A (11). The exhaust gas whose temperature has decreased in the heat exchanger A (11) exchanges heat with the outside air attracted by the fan D (24) from the outside air inlet (3) in the heat exchanger B (12). Further, the exhaust gas whose temperature has decreased in the heat exchanger B (12) is cooled to near the outside air temperature using cooling water (chiller) or outside air in the heat exchanger C (13). The exhaust gas cooled to near the outside air temperature is attracted by the fan B (22), dehumidified in two stages in the dehumidification tower A1 (31) and the dehumidification tower A2 (32), and carbon dioxide is adsorbed and recovered in the adsorption tower (35).

[0029] (Regeneration of the dehumidification tower during carbon dioxide recovery) Regarding the regeneration of the dehumidification towers B1(33) and B2(34) that performed dehumidification during the previous night B and the current day B, the air is drawn by the fan B(22), dehumidified in two stages by the dehumidification towers A1(31) and A2(32), and the low dew point air after carbon dioxide is adsorbed and recovered by the adsorption tower(35) is used. The low dew point air drawn by the fan C(23) is heated by the heat exchanger A(11) to become high-temperature dry air, and is sent in the direction opposite to that during dehumidification in the order of the dehumidification tower B2(34) and the dehumidification tower B1(33) for regeneration. The dried air used for regeneration is drawn by the fan C(23) and discharged to the outside air from the exhaust gas outlet(2).

[0030] (Supply of Carbon Dioxide) Figure 2 is a diagram showing an example of the carbon dioxide supply process during the day A. The supply of carbon dioxide is carried out during the day (after morning). The supply air with a lower carbon dioxide concentration than the exhaust gas is drawn by the fan B(22), taken in from the outside air inlet(7), dehumidified by the dehumidification towers A1(31) and A2(32), and then sent to the adsorption tower(35) where carbon dioxide is released. The air containing the released carbon dioxide is supplied into the house from the house internal air outlet(8) via the fan B(22). The signal for carbon dioxide release is such that when the carbon dioxide concentration measured by the carbon dioxide concentration meter installed in the house is lower than the reference value A, the fan B(22) operates, and when the carbon dioxide concentration exceeds the reference value B, the fan B(22) stops.

[0031] <Dehumidification and Heating Process> An example of the dehumidification and heating process during the night A is shown in Figure 1. In this embodiment, the drying of the dehumidification material that adsorbed water vapor and was used for dehumidification and heating during the previous night B is carried out by using waste heat at a lower temperature than the waste heat used for the regeneration of the dehumidification material used for the dehumidification of combustion exhaust gas. That is, after heat exchange is performed between the combustion exhaust gas and air used for drying the dehumidifying material for dehumidifying combustion exhaust gas described in the previous item in the heat exchanger A (11), the combustion exhaust gas and the outside air attracted by the fan D from the outside air inlet (3) are subjected to heat exchange in the heat exchanger B (12), and the air is introduced into the dehumidifying tower X1 (36) to regenerate the dehumidifying material in the dehumidifying tower X1, passes through the fan D (24), and is discharged to the outside air from the outside air outlet (4). On the other hand, into the dehumidifying tower Y1 (37) dried at night on the previous day B, the humid air in the house attracted by the fan E (25) from the house air inlet (5) is introduced, dehumidification is performed, and the high-temperature dry air warmed by the adsorption of water vapor is discharged into the house from the house air outlet (6).

[0032] <Switching of carbon dioxide recovery and supply process> After carbon dioxide is supplied, carbon dioxide recovery is required again from the night of that day. At that time, the line of the dehumidification process is switched to perform the operation. FIG. 3 shows the carbon dioxide recovery process and the dehumidification and heating process on the night B of the day following the night A. In the present embodiment, the recovery of carbon dioxide on the next day is as described below. The high-temperature exhaust gas containing carbon dioxide is cooled to near the outside air temperature through three heat exchangers, dehumidified in two stages, and then carbon dioxide is recovered in the adsorption tower. That is, the exhaust gas introduced from the exhaust gas inlet (1) is attracted by the fan A (21) and exchanges heat with the low dew point air that has passed through the adsorption tower (35) in the heat exchanger A (11). The exhaust gas whose temperature has decreased in the heat exchanger A (11) exchanges heat with the outside air attracted by the fan D (24) from the outside air inlet (3) in the heat exchanger B (12). Further, the exhaust gas whose temperature has decreased in the heat exchanger B (12) is cooled to a temperature near the outside air temperature by the heat exchanger C (13). The exhaust gas cooled to near the outside air temperature is attracted by the fan B (22), dehumidified in two stages in the dehumidifying tower B1 (33) and the dehumidifying tower B2 (34), and carbon dioxide is adsorbed and recovered in the adsorption tower (35). For the regeneration drying of the dehumidification towers A1 (31) and A2 (32) that were dehumidified during the previous night A and the current day A, the air is drawn by the fan B (22), dehumidified in two stages by the dehumidification towers B1 (33) and B2 (34), and the dried low dew point air after carbon dioxide is adsorbed and recovered by the adsorption tower (35) is used. The low dew point air drawn by the fan C (23) is heated by the heat exchanger A (11) to become high-temperature dried air, and is sent in the reverse direction of the dehumidification process in the order of the dehumidification tower A2 (32) and the dehumidification tower A1 (31) for regeneration. The air after being used for regeneration is drawn by the fan C (23) and discharged to the outside air from the exhaust gas outlet (2).

[0033] (Supply of Carbon Dioxide) Figure 4 is a diagram showing an example of the carbon dioxide supply process during the day B which is the day after the day A. The supply of carbon dioxide is carried out during the day (after morning). The supply air with a lower carbon dioxide concentration than the combustion exhaust gas is drawn by the fan B (22), takes in air from the outside air inlet (7), is dehumidified by the dehumidification towers B1 (33) and B2 (34), and then sent to the adsorption tower (35) to release the carbon dioxide adsorbed by the adsorbent. The air containing the released carbon dioxide is supplied and discharged into the house from the house interior air outlet (8) via the fan B (22). The signal for carbon dioxide release is a system where when the carbon dioxide concentration measured by the carbon dioxide concentration meter installed in the house is lower than the reference value A, the fan B (22) operates, and when the carbon dioxide concentration exceeds the reference value B, the fan B (22) stops.

[0034] <Switching of the Dehumidification and Heating Process> Figure 3 shows an example of the dehumidification and heating process during the night B. On the previous night, for the drying of the dehumidifying material that adsorbed water vapor and was used for dehumidification and heating in A, after the heat exchanger A (11) performed heat exchange between the combustion exhaust gas after heat exchange with the air used for regenerating the dehumidifying material for dehumidifying the combustion exhaust gas described in the previous item and the outside air attracted by the fan D (24) from the outside air inlet (3), the air that has undergone heat exchange in the heat exchanger B (12) is introduced into the dehumidification tower Y1 (37) to regenerate the dehumidifying material in the dehumidification tower Y1, passes through the fan D (24), and is discharged to the outside air from the outside air outlet (4). On the other hand, into the dehumidification tower X1 (36) regenerated on the previous night in A, the humid air in the house attracted by the fan E (25) from the house air inlet (5) is introduced, dehumidification is performed, and the high-temperature dry air warmed by the adsorption of water vapor is discharged into the house from the house air outlet (6).

[0035] As described above, the preferred embodiments of the present invention have been described in detail. However, the present invention is not limited to such specific embodiments, and various modifications and changes are possible within the scope described in the claims.

Explanation of Reference Numerals

[0036] 1: Exhaust gas inlet 2: Exhaust gas outlet 3: Outside air inlet 4: Outside air outlet 5: House air inlet 6: House air outlet 7: Outside air inlet 8: House air outlet 11: Heat exchanger A 12: Heat exchanger B 13: Heat exchanger C 21: Fan A 22: Fan B 23: Fan C 24: Fan D 25: Fan E 31: Dehumidification tower A1 32: Dehumidification tower A2 33: Dehumidification tower B1 34: Dehumidification tower B2 35: Adsorption tower 36: Dehumidification Tower X1 37: Dehumidification Tower Y1

Claims

1. After dehumidifying the combustion exhaust gas cooled to near the outside air temperature, carbon dioxide in the combustion exhaust gas is adsorbed and recovered by an adsorbent, and the low dew-point air after recovering the carbon dioxide is heated by the exhaust heat from the combustor, and the dehumidifying material used in the dehumidification step is regenerated using the heated air, and the recovered carbon dioxide is supplied to a horticultural facility by sending air having a lower carbon dioxide concentration than the combustion exhaust gas to the adsorbent, a carbon dioxide recovery / supply step, and humid air in the horticultural facility is sent to a dehumidifying material to supply dehumidified and heated air into the horticultural facility, and the regeneration of the dehumidifying material is performed by using exhaust heat at a temperature lower than the exhaust heat used for regenerating the dehumidifying material in the carbon dioxide recovery step, a dehumidification / warming step in the horticultural facility A carbon dioxide recovery / supply and dehumidification / warming system in a horticultural facility including the above steps.

2. The carbon dioxide recovery / supply and dehumidification / warming system in a horticultural facility according to claim 1, wherein zeolite is used as the adsorbent, and an amorphous aluminosilicate or an aluminosilicate composite composed of a low-crystalline layered clay mineral and an amorphous aluminosilicate is used as the dehumidifying material used for dehumidification and warming.

3. The carbon dioxide recovery / supply and dehumidification / warming system in a horticultural facility according to claim 1 or 2, wherein the dehumidification of the combustion exhaust gas is performed in two stages: upstream dehumidification using an amorphous aluminosilicate or an aluminosilicate composite composed of a low-crystalline layered clay mineral and an amorphous aluminosilicate as the dehumidifying material, and downstream dehumidification using zeolite as the dehumidifying material.

Images