Heat and carbon dioxide utilization system

Abstract

To provide a heat and carbon dioxide utilization system that uses an adsorbent to generate a large amount of heat per unit volume when water vapor is adsorbed, and that can supply carbon dioxide with a balanced supply of heat and carbon dioxide.SOLUTION: A heat and carbon dioxide utilization system comprises: drying and cooling an adsorbent having pores capable of adsorbing and desorbing water vapor and carbon dioxide by flowing heated air through the adsorbent, and then supplying dehumidified air containing carbon dioxide to the adsorbent to cause the adsorbent to adsorb carbon dioxide; transporting the adsorbent with adsorbed carbon dioxide to a horticultural facility; and supplying the carbon dioxide released from the adsorbent into the horticultural facility, and then supplying the heat generated when the adsorbent adsorbs water vapor.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a system for utilizing heat and carbon dioxide, and in particular to the utilization of heat and carbon dioxide in the agricultural field such as greenhouse horticulture. [Background technology]

[0002] The amount of carbon dioxide emissions from heating greenhouse cultivation is the largest in the agriculture, forestry and fisheries industries, and there is an urgent need to develop new cultivation techniques that do not use fossil fuels. In addition, the soaring cost of fuel is putting pressure on farmers' management, so there are hopes for a stable supply of heat at low cost by utilizing exhaust heat.

[0003] In the above-mentioned background, it has been proposed to use an adsorbent capable of adsorbing water vapor and to utilize the heat released when the adsorbent adsorbs water vapor. For example, Patent Document 1 proposes a heating system for automobiles and the like, in which water vapor is adsorbed onto an adsorbent such as zeolite and the heat generated during the adsorption is utilized.

[0004] Furthermore, Patent Document 2 proposes a system in which heat from factory waste heat, solar heat, and heat pumps is used to heat and store heat in an adsorbent (heat storage material), and when the heat is to be used, moist outside air is supplied to the adsorbent, making it possible to supply high-temperature, low-humidity intake air to the heat demander using the stored heat and the heat generated when the adsorbent adsorbs moisture.In order to make it possible to utilize low-temperature exhaust heat, a composite of amorphous aluminum silicate and low-crystalline clay or a polymeric sorbent is used.

[0005] Furthermore, Patent Document 3 proposes a system in which high-humidity air in a horticultural facility is sent to an adsorbent, which adsorbs and dehumidifies the air, and at the same time, the air heated by the heat generated during adsorption is sent into the horticultural facility, thereby simultaneously heating and dehumidifying the facility, and the system is said to be capable of preventing high-humidity conditions that lead to the occurrence of plant diseases such as powdery mildew and flower spots.The system is also said to be suitable for the adsorbent, as it has a very large water vapor adsorption amount in high-humidity regions.

[0006] On the other hand, in greenhouse horticulture, the use of carbon dioxide is required to promote photosynthesis. In view of this, it has been proposed to recover carbon dioxide from the exhaust gas of heaters used in horticultural facilities and apply the carbon dioxide to the horticultural facilities. For example, Patent Document 4 describes a carbon dioxide supply device for a horticultural facility, which includes a means for recovering and concentrating carbon dioxide contained in a combustion exhaust gas using a carbon dioxide adsorbent capable of adsorption and desorption by pressure swing without requiring a heat source, a means for storing the concentrated carbon dioxide at a pressure equal to or higher than atmospheric pressure, and a means for releasing the carbon dioxide stored in the carbon dioxide adsorbent into the horticultural facility so that the concentration becomes suitable for photosynthesis when necessary in the horticultural facility. This patent document states that the device can easily start and stop the supply of carbon dioxide into the greenhouse with minimal power. In addition, the carbon dioxide adsorbent may be an adsorbent that has a large amount of carbon dioxide adsorption at atmospheric pressure or higher and releases it simply by returning it to atmospheric pressure, and one example is HASClay (registered trademark) made of a complex of low-crystalline clay and amorphous material.

[0007] Patent Document 5 describes a carbon dioxide supply device for a horticultural facility, which includes a means for recovering and storing carbon dioxide contained in a combustion exhaust gas using a carbon dioxide adsorbent capable of adsorbing and desorbing depending on the concentration difference of carbon dioxide, and further includes a means for releasing the carbon dioxide stored in the carbon dioxide adsorbent into the horticultural facility when necessary by feeding dehumidified air. This patent document states that the device can easily supply carbon dioxide into a greenhouse without using a vacuum pump or compressor required for the pressure swing method. In addition, the carbon dioxide adsorbent may be an adsorbent that has a large amount of carbon dioxide adsorption under exhaust gas conditions (carbon dioxide concentration of about 10 vol%) and can release carbon dioxide in the atmosphere (carbon dioxide concentration of about 0.03 vol%), and is preferably zeolite.

[0008] However, Patent Documents 4 and 5 do not disclose the use of the adsorption heat of the above-mentioned adsorbent to supply heat within a horticultural facility. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Special Publication No. 2015-516909 [Patent Document 2] JP 2017-089946 A [Patent Document 3] JP 2020-074758 A [Patent Document 4] JP 2012-016322 A [Patent Document 5] JP 2013-074887 A [Non-patent literature]

[0010] [Non-Patent Document 1] Fukushima International Research and Education Institute (F-REI) Research and Development Survey Results in Agriculture, Forestry and Fisheries Sector 2023.03.29. Summary of the Invention [Problem to be solved by the invention]

[0011] The Fukushima International Research and Education Institute (F-REI)'s "Report on Research and Development Survey Results in the Agriculture, Forestry and Fisheries Sectors" (non-patent document 1 above) dated March 29, 2023, lists the construction and demonstration of a regional network that utilizes heat and carbon dioxide recovered from exhaust heat and exhaust gas from biomass power plants in remote horticultural facilities as one of the institute's research topics. In contrast, Patent Documents 4 and 5 above only propose, as a method of supplying carbon dioxide, the use of carbon dioxide contained in the combustion exhaust gas discharged from a horticultural facility, but do not mention the use of carbon dioxide in the exhaust gas discharged from another factory, such as the biomass power plant. As mentioned above, in greenhouse horticulture, in addition to the supply of carbon dioxide during the day, a supply of heat is also necessary at night when heating is required. Although heat supply systems using adsorbents and carbon dioxide supply systems using adsorbents have both been proposed, no consideration has been given to the use of adsorbents to enable the supply of both heat and carbon dioxide.

[0012] In light of this, there is a need to develop a system that can effectively utilize the carbon dioxide contained in exhaust gases emitted from biomass power plants and other factories, and that can supply both heat and carbon dioxide by using adsorbents. However, as long as a porous adsorbent is used, it is impossible to selectively extract either heat or carbon dioxide, and it is necessary to balance the supply of heat and carbon dioxide necessary for cultivation in a horticultural facility.

[0013] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide a heat and carbon dioxide utilization system that uses an adsorbent to generate a large amount of heat per unit volume when water vapor is adsorbed, and that is capable of supplying carbon dioxide with a balanced supply of heat and carbon dioxide. [Means for solving the problem]

[0014] As a result of extensive investigations aimed at achieving the above-mentioned object, the inventors have discovered a system for utilizing heat and carbon dioxide that uses an adsorbent having pores capable of adsorbing and desorbing water vapor and carbon dioxide, making it possible to supply both heat and carbon dioxide, that generates a large amount of heat per unit volume when the adsorbent adsorbs water vapor, and that makes it possible to supply carbon dioxide with a balanced amount of heat and carbon dioxide supplied, and have completed the present invention.

[0015] That is, in order to solve the above problems, the present invention employs the following means. [1] A step of drying an adsorbent having pores capable of adsorbing and desorbing water vapor and carbon dioxide by flowing heated air through the adsorbent, further cooling the adsorbent, and then supplying dehumidified air containing carbon dioxide to the adsorbent to adsorb carbon dioxide; Transporting the adsorbent having the carbon dioxide adsorbed thereon to a horticultural facility; and supplying the carbon dioxide released from the adsorbent into the horticultural facility, and then supplying heat generated when the adsorbent adsorbs water vapor; A heat and carbon dioxide utilization system comprising: [2] The heat and carbon dioxide utilization system according to [1], wherein the adsorbent is capable of supplying a heat quantity of 500 kJ or more per 1 L of volume and capable of supplying 5 to 30 g of carbon dioxide per 1 L of volume. [3] The heat and carbon dioxide utilization system according to [1] or [2], wherein the adsorbent has a water vapor adsorption amount of 10% or less of the maximum water vapor adsorption amount when carbon dioxide is supplied. [4] The heat and carbon dioxide utilization system according to any one of [1] to [3], wherein the adsorbent is an amorphous aluminum silicate, an aluminum silicate complex consisting of a low-crystalline layered clay mineral and an amorphous aluminum silicate, or a zeolite. [5] The system for utilizing heat and carbon dioxide described in any one of [1] to [4], wherein the heated air is heated by exhaust heat. [6] The system for utilizing heat and carbon dioxide described in any one of [1] to [5], wherein the air containing carbon dioxide is supplied from exhaust gas. [7] The system for utilizing heat and carbon dioxide described in any one of [1] to [6], wherein the step of adsorbing carbon dioxide is carried out in a biomass power plant. [8] The heat and carbon dioxide utilization system described in [7], further comprising a step of releasing carbon dioxide within the horticultural facility and transporting the adsorbent that has adsorbed water vapor to the biomass power plant. Effect of the Invention

[0016] In a typical horticultural facility, 1000m 2 In the case of a 1000m2 facility, the amount of heat supplied when the heater is operated for 10 hours is approximately 3,000 MJ, and the amount of carbon dioxide required is 20 to 30 kg. 2 In a horticultural facility of this size, it is possible to supply approximately 3,000 MJ of heat through water vapor adsorption, and at the same time, it is possible to supply 20 to 120 kg of carbon dioxide. Furthermore, in the present invention, exhaust heat and exhaust gas from a biomass power plant that does not use fossil fuels are used as the heat used to dry the adsorbent and the air used to adsorb carbon dioxide into the dried adsorbent, thereby making it possible to reduce costs and the amount of carbon dioxide emitted into the outside air. [Brief description of the drawings]

[0017] [Figure 1] Diagram showing the carbon dioxide adsorption process [Diagram 2] FIG. 1 shows an example of a process for supplying heat and carbon dioxide. [Diagram 3] FIG. 1 shows the change in carbon dioxide concentration and relative humidity over time when a composite of amorphous aluminum silicate and low-crystalline clay is used. [Figure 4]FIG. 1 shows the change in carbon dioxide concentration and relative humidity over time when synthetic zeolite is used. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, a heat and carbon dioxide utilization system in an embodiment of the present invention (hereinafter referred to as the "present embodiment") will be described, but the present invention is not limited to the following embodiment. In addition, when a numerical range is expressed using "~", it means that the numerical values ​​stated as the lower limit and upper limit are also included.

[0019] The heat and carbon dioxide utilization system in this embodiment includes the following steps (I) to (III). (I) A process in which heated air is passed through an adsorbent having pores capable of adsorbing and desorbing water vapor and carbon dioxide to dry the adsorbent, and then the adsorbent is cooled, and then dehumidified air containing carbon dioxide is supplied to the adsorbent to adsorb the carbon dioxide (hereinafter sometimes referred to as a "carbon dioxide adsorption process"). (II) A step of transporting the adsorbent having adsorbed carbon dioxide to a horticultural facility (hereinafter also referred to as a "transportation step"). (III) A process of supplying the carbon dioxide released from the adsorbent into the horticultural facility, and then supplying heat generated when the adsorbent adsorbs water vapor (hereinafter, also referred to as a "heat and carbon dioxide supply process").

[0020] <Adsorbent with pores capable of adsorbing and desorbing water vapor and carbon dioxide> In this embodiment, an adsorbent having pores capable of adsorbing and desorbing water vapor and carbon dioxide is used. Examples of adsorbents having pores capable of adsorbing and desorbing water vapor and carbon dioxide include aluminum silicate, zeolite, activated alumina, silica gel, etc. Specifically, the aluminum silicate is an amorphous aluminum silicate or an aluminum silicate complex composed of a low-crystalline layered clay mineral and an amorphous aluminum silicate.

[0021] The adsorbent used in this embodiment is preferably capable of supplying a calorific value of 500 kJ or more per 1 L of volume, and capable of supplying 5 to 30 g of carbon dioxide per 1 L of volume. Moreover, the adsorbent used in this embodiment is preferably one whose water vapor adsorption amount during carbon dioxide supply is 10% or less of the maximum water vapor adsorption amount. Specific preferred adsorbents include the above-mentioned aluminum silicates or zeolites.

[0022] <Carbon dioxide adsorption process> In the present embodiment, heated air is passed through the adsorbent to dry the adsorbent, and the adsorbent is then cooled. After that, dehumidified air containing carbon dioxide is supplied to the adsorbent to adsorb the carbon dioxide. As the air containing carbon dioxide, it is preferable to use exhaust gas containing a large amount of carbon dioxide, and in particular, it is particularly preferable to use exhaust gas from a biomass power plant that does not use fossil fuels. Therefore, the carbon dioxide adsorption step in this embodiment is preferably carried out in a biomass power plant.

[0023] FIG. 1 is a diagram showing an example of a carbon dioxide adsorption process using exhaust gas as air containing carbon dioxide. In the diagram, reference numeral 1 is an exhaust gas inlet, 2 is a heat exchanger for drying the adsorbent, 3 is a fan, 4 is a heat exchanger for drying the desiccant, 5 is a cooling device, 6 is a dehumidifier, 7 is a cooling device, 8 is a fan, 9 is a carbon dioxide supplier, 10 is an exhaust gas exhaust port, 11 is an outside air inlet, 12 is a fan, 13 is an adsorbent dryer, 14 is an outside air exhaust port, 15 is an outside air inlet, 16 is a fan, 17 is an outside air exhaust port, and 18 is an adsorbent cooling location.

[0024] (Drying the adsorbent) In this embodiment, the adsorbent is dried by supplying outside air that has been warmed by indirect heat exchange with exhaust heat into the adsorbent dryer (13), as described below. That is, exhaust gas introduced from the exhaust gas inlet (1) is drawn in by the fan (3) and exchanges heat with outside air introduced from the outside air inlet (11) drawn in by the fan (12) in the adsorbent drying heat exchanger (2). The outside air introduced from the outside air inlet (11) is warmed by the adsorbent drying heat exchanger (2), and the adsorbent placed in the adsorbent dryer (13) is dried by this warmed outside air. In this case, the adsorbent dryer (13) may be any structure capable of drying the adsorbent, and may be, for example, a container containing the adsorbent, or may be a structure in which the adsorbent is directly placed in the adsorbent dryer (13). Air containing water vapor generated when the adsorbent is dried is discharged from the outside air outlet (14).

[0025] (Cooling of the adsorbent) In the adsorption of carbon dioxide into the adsorbent, it is necessary to cool the adsorbent before the carbon dioxide is adsorbed. Therefore, the adsorbent dried in the adsorbent dryer (13) is placed in an adsorbent cooling area (18) while minimizing contact with outside air, and cooled until it reaches room temperature or close to the outside air temperature. The adsorbent may be left to cool naturally, or may be cooled in a refrigerator or the like.

[0026] (Carbon dioxide adsorption) In the carbon dioxide adsorption step, the adsorbent that adsorbs carbon dioxide is cooled in the adsorbent cooling place (18) and then placed in the carbon dioxide supply machine (9). On the other hand, the exhaust gas containing carbon dioxide passes through the fan (3), and then undergoes heat exchange with outside air introduced through an outside air inlet (15) in a heat exchanger (4) for drying a desiccant. Thereafter, the exhaust gas is cooled in a cooling device (5) and dehumidified by a dehumidifier (6).

[0027] In the dehumidifier (6), a process of adsorbing water vapor in the exhaust gas onto a desiccant material using a desiccant rotor or a batch process, and a process of removing the moisture adsorbed onto the desiccant material are carried out. The dehumidifying material (adsorbent) used in the dehumidifier (6) is preferably the same as the adsorbent that adsorbs carbon dioxide. The moisture removal process is carried out by warming outside air introduced through the outside air inlet (15) in the desiccant drying heat exchanger (4) and drawing it through the fan (16) to the dehumidifier (6) to dry the desiccant in the dehumidifier (6), and then discharging the outside air together with moisture from the outside air exhaust port (17). The temperature of the air introduced into the dehumidifier (6) to dry the desiccant needs to be higher than the temperature of the air introduced into the adsorbent dryer (13) described above.

[0028] The temperature of the exhaust gas rises due to the dehumidification in the dehumidifier (6), so it is cooled by a cooling device (7) provided downstream, and is then drawn in by a fan (8) and sent to a carbon dioxide supplying device (9). In this carbon dioxide supplying device (9), the dried and cooled adsorbent adsorbs the carbon dioxide contained in the exhaust gas, and an adsorbent capable of supplying heat and carbon dioxide is produced. The exhaust gas introduced into the carbon dioxide supplying device (9) is released to the outside air through an exhaust gas exhausting device (10). In the example of FIG. 1, two fans (3, 8) are placed in the exhaust gas line, but the installation locations and number of fans are not limited as long as they can circulate the exhaust gas air.

[0029] <Transportation process> The adsorbent having adsorbed carbon dioxide obtained in the above step is transported to a horticultural facility. At this time, it is necessary to transport the adsorbent having adsorbed carbon dioxide while minimizing its exposure to outside air.

[0030] <Heat and carbon dioxide supply process> In a horticultural facility, air with a low carbon dioxide concentration from within the horticultural facility is fed into the adsorbent with carbon dioxide adsorbed therein and transported in the above process, thereby releasing and supplying carbon dioxide, and then high humidity air from within the horticultural facility is fed in, making it possible to supply heat by the heat generated when the adsorbent adsorbs water vapor. FIG. 2 is a diagram showing an example of a heat and carbon dioxide supply process. In the figure, 21 is an air inlet for the horticultural facility, 22 is a heat and carbon dioxide supply device, 23 is a fan, 24 is an air exhaust port for the horticultural facility, 25 is a carbon dioxide concentration sensor, and 26 is a temperature sensor.

[0031] (Supply of carbon dioxide to horticultural facilities) The first step is to supply carbon dioxide into the horticultural facility. First, the adsorbent with the carbon dioxide adsorbed therein that has been delivered to the horticultural facility is set in the heat and carbon dioxide supply device (22). Next, as soon as the time period when carbon dioxide is needed arrives, the system is operated so that, for example, the fan (23) operates when the carbon dioxide concentration detected by the carbon dioxide concentration sensor (25) becomes 800 ppm or less, and the fan (23) stops when the carbon dioxide concentration becomes 1200 ppm or more. When the fan (23) operates, the fan (23) takes in air from the horticultural facility air inlet (21) and introduces it into the heat and carbon dioxide supply device (22). When air with a low carbon dioxide concentration (800 ppm in the above example) from the horticultural facility is introduced into the heat and carbon dioxide supply device (22), the carbon dioxide adsorbed in the adsorbent is released due to the difference in carbon dioxide concentration, and carbon dioxide is supplied to the horticultural facility from the horticultural facility air outlet (24) through the fan (23). Carbon dioxide is supplied in this manner, and when the end time for carbon dioxide supply arrives, the supply of carbon dioxide is terminated.

[0032] (Supply of heat to horticultural facilities) Next, after the evening of the same day when carbon dioxide was supplied, as soon as it becomes necessary to supply heat to the horticultural facility, the fan (23) is operated according to the temperature detected by the temperature sensor (26), for example, when the temperature falls below 10°C, and when the temperature rises above 15°C, the fan (23) is stopped. When the fan (23) is operated, it takes in high-humidity air from the greenhouse air inlet (21) and introduces it into the heat and carbon dioxide supplying device (22). When the high-humidity air from the horticultural facility is introduced into the heat and carbon dioxide supplying device (22), water vapor is adsorbed into the adsorbent that has finished the supply of carbon dioxide, generating heat, and warm, dry air is supplied into the horticultural facility through the air outlet (24) via the fan (23). Heat is supplied in this manner, and when the time to finish supplying heat arrives, the supply of heat is terminated.

[0033] The adsorbent that has finished supplying heat to the horticultural facility, i.e., the adsorbent with water vapor adsorbed therein, can be transported to the biomass power plant where the carbon dioxide adsorption process was carried out, and there, the adsorbent can be reused by being subjected to the carbon dioxide adsorption process again. EXAMPLES

[0034] In order to grasp the amount of heat and carbon dioxide supplied to the horticultural facility, the water vapor adsorption amount and carbon dioxide adsorption amount were evaluated using Example 1, in which a composite of amorphous aluminum silicate and low-crystalline clay (HASClay GI-Z, manufactured by Ishihara Sangyo Kaisha, Ltd.) (hereinafter referred to as "aluminum silicate composite") was used as the adsorbent, and Example 2, in which a synthetic zeolite (Zeolite 13X, manufactured by Union Showa Co., Ltd.) was used.

[0035] <Heat supply by adsorbent> (Evaluation method) The aluminum silicate complex and zeolite 13X were each dried at 100°C for 6 hours, and then weighed to obtain the dry mass of each adsorbent. Next, each adsorbent was placed in a thermohygrostat at 25°C and 90% relative humidity to adsorb water vapor, and the mass after 6 hours was measured and obtained as the mass after adsorption. The adsorption amount was calculated from the dry mass and the mass after adsorption according to the following formula. Adsorption amount (kg / kg) = (mass after adsorption - dry mass) ÷ dry mass Based on the water vapor adsorption evaluation results, two heating values, one based on mass and one based on volume, were calculated from each hydration enthalpy value using the following formula. Calorific value (kJ / kg) = water vapor adsorption amount × hydration enthalpy Calorific value (kJ / L) = Calorific value (kJ / kg) x Bulk density The results are shown in Table 1.

[0036] [Table 1]

[0037] As shown in Table 1, in Example 1, in which an aluminum silicate complex was used as the adsorbent, the calorific value was expected to be 2333 kJ / kg on a mass basis and 956 kJ / L on a volume basis. 2 It was found that 3000 MJ of heat is required to heat a horticultural facility of this size, and the amount of adsorbent capable of adsorbing water vapor to obtain this amount of heat is 1286 kg in mass and 3136 L in volume. In contrast, in Example 2 using zeolite 13X, the expected calorific value is 812 kJ / kg on a mass basis and 577 kJ / L on a volume basis. Therefore, it was found that the amount of adsorbent capable of adsorbing water vapor to obtain the calorific value of 3000 MJ is 3695 kg in mass and 5204 L in volume.

[0038] <Amount of carbon dioxide supplied by adsorbent> (Evaluation method) The aluminum silicate complex and zeolite 13X were each dried at 100°C for 6 hours, and then weighed to determine the dry mass of each adsorbent. After sufficient cooling, each adsorbent was placed in a 170mL small container, and dry gas containing 10vol% carbon dioxide was passed through at a flow rate of 2L per minute to adsorb carbon dioxide into the adsorbent until the carbon dioxide concentration at the outlet of the small container became the same as that at the inlet, 10vol% carbon dioxide concentration. Next, outside air was bubbled to contain water vapor and a relative humidity of 90% was passed through the container at a flow rate of 2 liters per minute, and the carbon dioxide concentration at the outlet of the container was measured. FIG. 3 shows the changes in carbon dioxide concentration and relative humidity over time when the aluminum silicate complex was used, and FIG. 4 shows the changes in carbon dioxide concentration and relative humidity over time when zeolite 13X was used.

[0039] As shown in Figure 3, when the aluminum silicate complex was used, the carbon dioxide concentration at the outlet of the small container reached 1 vol% 10 minutes after the start of carbon dioxide release. The amount of carbon dioxide released at this time was 1.38 g, which is equivalent to 8.13 g per liter. This amount was calculated from the amount of aluminum silicate complex required for heating, 3136 L, and it was shown that it was possible to release 25.5 kg of carbon dioxide. The amount of water vapor adsorbed in the 10 minutes until the end of carbon dioxide release was 0.41 g, calculated by integrating the difference in the amount of water vapor obtained by converting the relative humidity at the inlet and outlet into absolute humidity. From Table 1, the maximum water vapor adsorption amount that the aluminum silicate complex in the small container can adsorb is calculated to be 170 mL x (0.41 kg / L) x (0.72 kg / kg) = 50.18 g, and the water vapor adsorption amount of 0.41 g was only 0.82% of the maximum water vapor adsorption amount.

[0040] On the other hand, as shown in Figure 4, when zeolite 13X was used, the outlet carbon dioxide concentration of the small container reached 1 vol% 45 minutes after the start of carbon dioxide release. The amount of carbon dioxide released at this time was 3.20 g, which is equivalent to 18.80 g per liter. This amount was calculated from the amount of zeolite 13X required for heating, 5204 L, and it was shown that it was possible to release 97.8 kg of carbon dioxide. The amount of water vapor adsorbed in the 45 minutes until the end of carbon dioxide release was 1.87 g, calculated by integrating the difference in the amount of water vapor obtained by converting the relative humidity at the inlet and outlet into absolute humidity. From Table 1, the maximum amount of water vapor that the zeolite 13X in the small container can adsorb is calculated to be 170 mL x (0.71 kg / L) x (0.21 kg / kg) = 25.35 g, and the water vapor adsorption amount of 1.87 g was 7.4% of the maximum water vapor adsorption amount.

[0041] These results show that if you want to increase the amount of heat in winter, it is effective to use an aluminum silicate complex, and if you do not need much heat in spring or autumn but want to use a lot of carbon dioxide, it is effective to use zeolite 13X. Of course, whether to use an aluminum silicate complex or zeolite 13X depends on the crop, and a choice that suits each situation is necessary. [Explanation of symbols]

[0042] 1: Exhaust gas inlet 2: Heat exchanger for drying adsorbent 3: Fan 4: Heat exchanger for drying dehumidifying material 5: Cooling device 6:Dehumidifier 7: Cooling device 8: Fan 9: Carbon dioxide supply machine 10: Exhaust gas outlet 11: Fresh air intake 12: Fan 13:Adsorbent dryer 14: Outside air exhaust port 15: Fresh air intake 16: Fan 17: Outside air exhaust port 18: Adsorbent cooling area 21: Air inlet for horticultural facility 22: Heat and carbon dioxide supply device 23: Fan 24: Air exhaust outlet in horticultural facility 25: Carbon dioxide concentration sensor 26:Temperature sensor

Claims

1. a step of drying the adsorbent by flowing heated air through the adsorbent having pores capable of adsorbing and desorbing water vapor and carbon dioxide, and then cooling the adsorbent, and then supplying dehumidified air containing carbon dioxide to the adsorbent to adsorb carbon dioxide; Transporting the adsorbent having the carbon dioxide adsorbed thereon to a horticultural facility; and supplying the carbon dioxide released from the adsorbent into the horticultural facility, and then supplying heat generated when the adsorbent adsorbs water vapor; A heat and carbon dioxide utilization system comprising:

2. The heat and carbon dioxide utilization system according to claim 1, wherein an adsorbent capable of supplying a heat quantity of 500 kJ or more per 1 L of volume and capable of supplying 3 to 30 g of carbon dioxide per 1 L of volume is used as the adsorbent.

3. 2. The system for utilizing heat and carbon dioxide according to claim 1, wherein an adsorbent having a water vapor adsorption amount of 10% or less of a maximum water vapor adsorption amount when carbon dioxide is supplied is used as the adsorbent.

4. 2. The system for utilizing heat and carbon dioxide according to claim 1, wherein the adsorbent is an amorphous aluminum silicate, an aluminum silicate complex consisting of a low-crystalline layered clay mineral and an amorphous aluminum silicate, or a zeolite.

5. The heat and carbon dioxide utilization system according to any one of claims 1 to 4, wherein the heated air is heated by exhaust heat.

6. The heat and carbon dioxide utilization system according to any one of claims 1 to 4, wherein the air containing carbon dioxide is supplied from exhaust gas.

7. The heat and carbon dioxide utilization system according to any one of claims 1 to 4, wherein the carbon dioxide adsorption step is carried out in a biomass power plant.

8. The heat and carbon dioxide utilization system according to claim 7, further comprising a step of releasing carbon dioxide within the horticultural facility and transporting the adsorbent that has adsorbed water vapor to the biomass power plant.

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