Circulation type system

Abstract

To provide a circulation type system capable of improving energy efficiency.SOLUTION: A circulation type system 1 includes a biomass generator 10 for supplying power to a specific facility F, and a first air conditioner 40 for performing air conditioning of the specific facility F on the basis of waste heat generated by use of fuel in the biomass generator 10. An agricultural greenhouse cultivation system includes a second air conditioner 60 that performs air conditioning of an agricultural greenhouse AH in which plants are cultivated, a second power supply unit 50 that supplies generated power in a biomass generator 10 to at least one of equipment of the agricultural greenhouse AH and the second air conditioner 60, and a carbon dioxide supply unit 70 that supplies carbon dioxide generated by use of fuel in the biomass generator 10 to the agricultural greenhouse AH, in which the agricultural greenhouse AH grows wood for obtaining a woody material usable as fuel in the biomass generator 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a circulation system. [Background technology]

[0002] In recent years, energy-saving air conditioning systems have been proposed for cooling or heating facilities (see, for example, Patent Document 1). Such air conditioning systems have been attracting attention for their improved energy efficiency. In addition, systems have also been proposed that use solar power to generate electricity for facilities (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2022-114707 [Patent Document 2] Japanese Patent Application Publication No. 2018-161044 Summary of the Invention [Problem to be solved by the invention]

[0004] The systems described in Patent Documents 1 and 2 aim to improve energy efficiency by improving energy efficiency based on control and by utilizing natural energy. However, the present inventors have been considering improving energy efficiency from a completely different perspective, and have found that the systems described in Patent Documents 1 and 2 are still insufficient in terms of energy efficiency.

[0005] The present invention has been made to solve the above-mentioned problems of the prior art, and its object is to provide a circulation system that can achieve improvements in terms of energy efficiency. [Means for solving the problem]

[0006] The circular system of the present invention comprises a biomass generator that generates biomass electricity by using wood material as fuel to rotate a turbine and supply electricity to a specific facility; an air conditioner that air-conditions the specific facility using waste heat generated by the use of the fuel in the biomass generator; a second air conditioner that air-conditions an agricultural greenhouse in which plants are cultivated using waste heat generated by the use of the fuel in the biomass generator; a first supply structure that supplies the electricity generated in the biomass generator to at least one of the equipment in the agricultural greenhouse and the second air conditioner, and a second supply structure that supplies carbon dioxide generated by the use of the fuel in the biomass generator to the agricultural greenhouse, and the agricultural greenhouse is used to grow wood to obtain wood material that can be used as fuel for the biomass generator. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a circulation system that can improve energy efficiency. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a configuration diagram showing a circulation type system according to an embodiment of the present invention. [Figure 2] FIG. 2 is a configuration diagram showing an example of a carbon dioxide supply unit shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention will be described below in accordance with preferred embodiments. Note that the present invention is not limited to the embodiments shown below, and the embodiments can be modified as appropriate without departing from the spirit of the present invention. In addition, in the embodiments shown below, some components are omitted from illustration and description, but for the details of the omitted technologies, publicly known or well-known technologies are applied as appropriate within the scope of not causing any contradiction with the content described below.

[0010] FIG. 1 is a configuration diagram showing a recycling system according to an embodiment of the present invention. The recycling system 1 shown in FIG. 1 includes a biomass generator 10, and supplies a specific facility F, such as a hotel, with electricity generated by the biomass generator 10 and an air-conditioned environment utilizing waste heat from the biomass generator 10. The recycling system 1 shown in FIG. 1 also cultivates plants using the air-conditioned environment utilizing the electricity generated and waste heat from the biomass generator 10, as well as the carbon dioxide generated. In particular, the recycling system 1 according to this embodiment is designed to grow wood to produce its own fuel for the biomass generator 10, thereby improving energy efficiency.

[0011] The circulation system 1 includes a first power supply unit 20, a heat storage tank 30, and a first air conditioner 40 in addition to the biomass power generator 10 described above.

[0012] The biomass generator 10 generates electricity using wood materials as fuel. Examples of wood materials include wood pellets and wood chips. The wood material may also be firewood. The biomass generator 10 according to this embodiment generates electricity by burning these wood materials to rotate a turbine (not shown). When the wood materials are burned, waste heat and carbon dioxide are generated.

[0013] The first power supply unit 20 is a component that includes a power line that supplies the power generated by the biomass generator 10 to a specific facility F. The power generated by the biomass generator 10 is supplied to the specific facility F via this first power supply unit 20 and is used for equipment such as lighting equipment and cooking appliances in the specific facility F. It is preferable that the first power supply unit 20 includes a storage battery intended for the specific facility F, and is configured to store electricity in the storage battery and then supply it to the specific facility F. The first power supply unit 20 also supplies operating power for the first air conditioner 40.

[0014] The heat storage tank 30 stores waste heat generated by the use of fuel in the biomass power generator 10. This heat storage tank 30 stores heat by, for example, using the waste heat to heat a heat medium such as water. Note that the heat storage tank 30 is not limited to storing heat in water, and may store heat in other heat medium fluids, or may store heat in a heat storage material such as heat storage ceramics.

[0015] The first air conditioner 40 is equipment for preparing an air-conditioned environment in a specific facility F, and is configured, for example, by an absorption chiller / heater that performs heating and cooling by utilizing heat in the heat storage tank 30. However, the first air conditioner 40 is not limited to this, and may also be configured by an absorption chiller that performs only cooling, a radiant panel that introduces chilled or hot water to heat or cool the room, or a combination thereof.

[0016] As described above, the circulation system 1 of this embodiment is equipped with a biomass generator 10, a first power supply unit 20, a heat storage tank 30, and a first air conditioner 40, and is therefore able to obtain electricity and provide an air-conditioned environment at a specific facility F, such as a hotel.

[0017] Furthermore, the circulation system 1 according to this embodiment includes an agricultural greenhouse AH, a second power supply unit (first supply structure) 50, a second air conditioner 60, and a carbon dioxide supply unit (second supply structure) .

[0018] The agricultural greenhouse AH is a facility for cultivating plants, and may be a simple cultivation facility such as a vinyl greenhouse, or a closed cultivation facility with a roof and lighting equipment that cultivates plants using the light from the lighting equipment.

[0019] In particular, in this embodiment, the agricultural house AH is used to grow lumber to obtain wood material that can be used as fuel in the biomass power generator 10. The agricultural house AH preferably includes a first house AH1 for growing lumber and a second house AH2 for cultivating crops. The lumber grown in the first house AH1 is not particularly limited, but examples include cedar, pine, and cypress. The lumber grown in the first house AH1 is preferably so-called elite trees. An elite tree is a seedling selected from among seedlings obtained by crossbreeding particularly superior trees with excellent growth performance. Furthermore, the first house AH1 is used to grow lumber until it becomes a sapling suitable for planting, but it may also be grown beyond that stage. The crops grown in the second house AH2 are also not particularly limited, but examples include strawberries, eggplants, cucumbers, cherry tomatoes, and various other varieties.

[0020] The second power supply unit 50 is a component that includes a power line that supplies the power generated by the biomass generator 10 to the agricultural house AH. The power generated by the biomass generator 10 is supplied to the agricultural house AH through this second power supply unit 50 and is used for equipment such as lighting equipment and water sprinklers in the agricultural house AH. The second power supply unit 50 may also include a storage battery intended for the agricultural house AH, and may be configured to store electricity in the storage battery and then supply it to the agricultural house AH. The second power supply unit 50 also supplies operating power to the second air conditioner 60.

[0021] The second air conditioner 60 is a device for adjusting the air-conditioning environment in the agricultural greenhouse AH, and is configured, for example, by an absorption chiller / heater that performs heating and cooling by utilizing the heat in the heat storage tank 30. However, the second air conditioner 60 is not limited to this, and may be configured by an absorption chiller that performs only cooling, a radiant panel that introduces chilled or hot water to heat or cool the room, or a combination thereof.

[0022] The carbon dioxide supplying unit 70 supplies the agricultural house AH with carbon dioxide generated by the use of fuel in the biomass power generator 10. The carbon dioxide supplying unit 70 preferably includes a tank 75 (see FIG. 2) and the like, as will be described later.

[0023] In addition to the biomass generator 10, the first power supply unit 20, the heat storage tank 30, and the first air conditioner 40, the circulation system 1 further includes a second power supply unit 50, a second air conditioner 60, a carbon dioxide supply unit 70, and an agricultural greenhouse AH. Therefore, the circulation system 1 can provide the agricultural greenhouse AH with the power generated by the biomass generator 10, an air-conditioned environment using waste heat, and carbon dioxide. In particular, the agricultural greenhouse AH produces its own fuel, thereby improving energy efficiency, since it grows wood to obtain wood material that is used as fuel for the biomass generator 10. More specifically, since carbon dioxide is not required in a specific facility F, using it to grow wood in the agricultural greenhouse AH can improve energy efficiency. Furthermore, when the demand for electricity or air conditioning in the specific facility F is low or when there is no room for storage in the heat storage tank 30 or storage battery, the electricity and heat can be used to grow wood in the agricultural greenhouse AH, further improving energy efficiency.

[0024] In addition, if the demand for electricity or air conditioning in a specific facility F is not low or if there is room to store electricity or heat in the heat storage tank 30 or storage battery, the electricity or heat may be used to grow wood in the agricultural greenhouse AH.

[0025] If the carbon dioxide required to grow the wood that forms the woody material is generated by burning the woody material, then the carbon dioxide environment can be considered to be plus or minus zero at the time of biomass power generation. Therefore, supplying the carbon dioxide generated during biomass power generation to the agricultural greenhouse AH will also result in a temporary reduction in carbon dioxide.

[0026] 2 is a configuration diagram showing an example of the carbon dioxide supply unit 70 shown in FIG. 2. As shown in FIG. 2, the carbon dioxide supply unit 70 preferably includes an exhaust path 71, which serves as a carbon dioxide supply path, a filter 72, a blower 73, a compressor 74, and a tank 75. The exhaust path 71 is a flow path through which exhaust gas from the biomass generator 10 flows. This exhaust path 71 has a first exhaust path 71a connecting the biomass generator 10 to the tank 75, and a second exhaust path 71b connecting the tank 75 to the agricultural house AH. A filter 72, a blower 73, and a compressor 74 are provided in this order along the first exhaust path 71a from the biomass generator 10 side, and a part of the first exhaust path 71a that is closer to the biomass generator 10 than the filter 72 constitutes a heat exchanger HE.

[0027] The heat exchanger HE is disposed below the heat storage tank 30. That is, the first exhaust passage 71a is connected to the tank 75 via the heat storage tank 30. The heat storage tank 30 is configured to introduce a heat medium as described above. Therefore, the heat exchanger HE heats the heat medium in the heat storage tank 30 by using the high-temperature exhaust gas generated in the biomass generator 10. Furthermore, the exhaust gas from the biomass generator 10 is cooled by heat exchange by the heat exchanger HE.

[0028] The filter 72 removes impurities from the exhaust gas. This filter 72 is preferably a combination of a dust filter that removes soot and the like contained in the exhaust gas, and a NOx absorption filter that removes nitrogen oxides. The blower 73 is a blowing means for smoothly circulating the exhaust gas. The compressor 74 compresses the exhaust gas (gas containing a large amount of carbon dioxide) and stores it in a tank 75 under high pressure. The tank 75 stores the gas containing a large amount of carbon dioxide under high pressure.

[0029] When the carbon dioxide concentration in the agricultural house AH is sufficient, the carbon dioxide supply unit 70 stores the exhaust gas in a tank 75 without disposing of it, and when the carbon dioxide in the agricultural house AH is insufficient, the carbon dioxide supply unit 70 supplies the required amount of carbon dioxide from the tank 75 to the agricultural house AH.

[0030] The carbon dioxide supply unit 70 cools the exhaust gas by utilizing heat exchange in the heat exchanger HE, but in case the cooling is insufficient, it may be provided with a separate cooling means such as a heat exchanger, or with a flow path for discarding the exhaust gas.

[0031] Furthermore, the carbon dioxide supply unit 70 preferably includes a control unit 76, a distribution mechanism 77, a flow meter 78, and a concentration meter 79, and performs distribution control to supply appropriate amounts of carbon dioxide to each of the first house AH1 and the second house AH2.

[0032] The control unit 76 controls the supply of carbon dioxide to the agricultural house AH in the carbon dioxide supply unit 70, and controls the opening and closing of the tank 75 and the opening degree of the distribution mechanism 77 based on signals from the flow meter 78 and the concentration meter 79.

[0033] The distribution mechanism 77 is a valve with an adjustable opening that is disposed in the second exhaust path 71b. By controlling this distribution mechanism 77, it is possible to adjust the amount of gas flowing through the second exhaust path 71b toward the first house AH1 side and the second house AH2 side.

[0034] The flow meter 78 measures the gas flow rate. This flow meter 78 includes a first flow meter 78a that measures the flow rate of the gas flowing on the first house AH1 side of the second exhaust path 71b, and a second flow meter 78b that measures the flow rate of the gas flowing on the second house AH2 side of the second exhaust path 71b. Information on the flow rates measured by the first flow meter 78a and the second flow meter 78b is sent to the control unit 76.

[0035] The concentration meter 79 measures the carbon dioxide concentration in the agricultural greenhouse AH. The concentration meter 79 includes a first concentration meter 79a that measures the carbon dioxide concentration in the first house AH1 and a second concentration meter 79b that measures the carbon dioxide concentration in the second house AH2. Information on the concentrations measured by the first concentration meter 79a and the second concentration meter 79b is transmitted to the control unit 76.

[0036] Here, the control unit 76 controls the amount of carbon dioxide supplied from the tank 75 to the agricultural house AH based on one of the following two viewpoints.

[0037] First, the control unit 76 controls the amount of gas supplied from the tank 75 to each house AH1, AH2 based on the ratio between the amount of carbon dioxide required in the first house AH1 and the amount of carbon dioxide required in the second house AH2. Specifically, the amount of carbon dioxide required in the first house AH1 is assumed to be CA1, and the amount of carbon dioxide required in the second house AH2 is assumed to be CA2. In this case, the control unit 76 adjusts the aperture of the distribution mechanism 77 so that (CA1 / CA1+CA2) of the gas from the tank 75 flows into the first house AH1. This also means that the control unit 76 adjusts the aperture of the distribution mechanism 77 so that (CA2 / CA1+CA2) of the gas from the tank 75 flows into the second house AH2. As a result, the control unit 76 supplies carbon dioxide at a ratio corresponding to the required amounts of carbon dioxide CA1, CA2.

[0038] The control unit 76 receives signals from the first concentration meter 79a and the second concentration meter 79b, and stops the supply of carbon dioxide from the tank 75 when the carbon dioxide concentration detected by either concentration meter 79a, 79b reaches a predetermined concentration (e.g., 800 ppm).

[0039] Furthermore, it is preferable to consider the growth rate of the wood or crop and the type of wood or crop when calculating the required amounts of carbon dioxide CA1 and CA2, because the required amounts of carbon dioxide CA1 and CA2 may change depending on the growth rate of the wood or crop and the type of wood or crop.

[0040] Second, the control unit 76 controls the carbon dioxide concentration in each house AH1, AH2 based on the ratio between the amount of carbon dioxide required in the first house AH1 and the amount of carbon dioxide required in the second house AH2. The required amounts of carbon dioxide CA1, CA2 are the same as above. Also, assume that the carbon dioxide concentration in the air is 400 ppm. In this case, the control unit 76 controls the amount of concentration added to 400 ppm so that it matches the ratio between the amounts of carbon dioxide CA1, CA2 required in each house AH1, AH2.

[0041] It is preferable that the control unit 76 supplies gas from the tank 75 until either the first house AH1 or the second house AH2 reaches a specified concentration (for example, 800 ppm).

[0042] Referring again to FIG. 1 , the agricultural greenhouse AH preferably includes a flow path R for spatially connecting the first house AH1 and the second house AH2. For example, given the relationship between the wood and crops to be cultivated, the optimum temperature for one of the first house AH1 and the second house AH2 may be higher and the optimum temperature for the other may be slightly lower. In this case, the circulation system 1 controls the appropriate temperature for one of the houses AH1 and AH2 and utilizes the heat leakage through the flow path R to maintain the temperature environment for the other house. This is because the temperature control of only one of the first house AH1 and the second house AH2 can also maintain the temperature environment for the other house. Similarly, the circulation system 1 may supply carbon dioxide to one of the first house AH1 and the second house AH2 when plants are in the growing season and the other is not, and utilize the outflow of carbon dioxide through the flow path R without supplying carbon dioxide to the other house. This is because the carbon dioxide concentration of the first house AH1 or the second house AH2 can also be maintained by controlling the carbon dioxide concentration of only one of the houses AH1 and AH2. In particular, it is preferable to combine the control of the carbon dioxide supply by the control unit 76 (see FIG. 2) with the opening and closing control of the flow path R to perform more appropriate carbon dioxide supply control.

[0043] It is preferable that the flow path R be openable and closable, since there are cases where it is not always desirable to prevent temperature leakage or carbon dioxide outflow.

[0044] Furthermore, in this embodiment, it is assumed that the power output of the biomass generator 10 is X kW, the power generation efficiency is Y, the planned total annual operation time is Z hours, and the calorific value of the wood material is C kW / kg. In this case, it is preferable that the agricultural greenhouse AH is one that grows seedlings of a number of trees equivalent to the mass required to obtain X·Z / C·Y at the time of harvesting.

[0045] This means that when the seedlings grown in the agricultural greenhouse AH grow and are harvested and cut down, it will theoretically be possible to cover the fuel used for the year, making it close to a completely circular system.

[0046] The details are as follows. First, if the power output of the biomass generator 10 is X (kW) and the power generation efficiency is Y, then the input amount required to generate power per hour is X / Y (kW). Here, if the calorific value of wood material is C (kW / kg), then the wood material required to generate power per hour is X / C·Y (kg). Therefore, if the planned total operating time per year is Z hours, then the wood material required to generate power per year is X·Z / C·Y (kg). Note that the planned total operating time per year is, for example, 24 × 365 = 8,760 hours for a biomass generator 10 that performs baseload operation, or 365 hours for a biomass generator 10 with a timer schedule.

[0047] The agricultural greenhouse AH grows the number of seedlings that will yield X·Z / C·Y (kg) when harvested. For example, in the case of cedar wood pellets, the calorific value C is 4.65kW / kg, so the amount of cedar wood pellets required to generate electricity for one year is X·Z / 4.65·Y (kg). Here, the average volume of one cedar tree is 0.57m 3Assuming an average specific gravity of 0.6, the average weight per tree, AW, is 342 kg. If the average percentage of wood waste (the average percentage of the weight of wood pellets from one tree), AC, is just under 30%, then the wood pellets obtained from one cedar tree are approximately 100 kg. Therefore, the number of cedar trees required to generate electricity in one year is X·Z / AW·AC·4.65·Y = X·Z / 465Y (trees).

[0048] Therefore, when the biomass power generator 10 uses cedar wood pellets as the wood material, it is preferable that the agricultural greenhouse AH is one that grows more than X·Z / 465·Y seedlings.

[0049] Here, let's assume that there are two biomass generators 10 (power output 165 kW) that use cedar wood pellets, one of which operates as a base load 24 hours a day, 365 days a year, and the other operates 16 hours a day, 365 days a year, from 7:00 to 23:00, in line with the operating hours of a specific facility F. In this case, the power output X is 165 kW, and the total operating time Z is 14,600 hours. The power generation efficiency Y is assumed to be 0.3. In this case, the value of the calculation formula X·Z / 465·Y is approximately 17,268.81. Therefore, the agricultural greenhouse AH in this case will be able to grow more than 17,269 cedar seedlings.

[0050] If such a number of cultivated seedlings were to be planted, 2,500 cedar trees would be planted per hectare. Therefore, the required area would be 6.7 hectares. Japan's forest area is approximately 250,000 hectares, and the area of ​​privately owned mountains is often around 400 hectares, so 6.7 hectares is quite realistic. Therefore, a complete recycling system 1 would also be possible.

[0051] Furthermore, even if the wood material is not cedar wood pellets, it is possible to calculate the number of seedlings that will yield X·Z / C·Y (kg). For example, in the case of pine or cypress, the average weight at the time of harvest is clear. Furthermore, when these wood materials are made into wood pellets or wood chips, known values ​​can be used for the calorific value. Furthermore, just like with cedar above, it is possible to calculate the percentage of scrap wood. However, if all of the wood is used as firewood, there is no need to calculate the percentage of scrap wood.

[0052] Next, the operation of the recycling system 1 according to this embodiment will be described. First, the biomass generator 10 burns wood material as fuel. As a result, the biomass generator 10 generates electricity and obtains waste heat and carbon dioxide.

[0053] The generated power is supplied by the first power supply unit 20 to the specific facility F and to the first air conditioner 40. Preferably, the first power supply unit 20 includes a storage battery, and power is supplied to the specific facility F and the first air conditioner 40 via the storage battery.

[0054] Furthermore, the generated power is supplied by the second power supply unit 50 to the agricultural house AH, the second air conditioner 60, and the carbon dioxide supply unit 70. It is preferable that the second power supply unit 50 includes a storage battery, and that power is supplied to the agricultural house AH, the second air conditioner 60, and the carbon dioxide supply unit 70 via the storage battery.

[0055] 2, the exhaust gas generated by the combustion of wood materials in the biomass generator 10 is supplied to the heat exchanger HE in the heat storage tank 30 through the exhaust path 71 and is used to heat the heat medium in the heat storage tank 30. In this way, heat is stored in the heat storage tank 30.

[0056] Furthermore, the exhaust air that has passed through the heat exchanger HE has impurities removed through a filter 72 and is then compressed and stored in a tank 75 by a compressor 74. Carbon dioxide is then supplied from the tank 75 into the agricultural house AH as needed. The supply of carbon dioxide is controlled by a control unit that receives a signal from a carbon dioxide concentration sensor provided in the agricultural house AH. The supply of carbon dioxide may also be performed manually by an operator who refers to the carbon dioxide concentration meter.

[0057] Furthermore, the first air conditioner 40 and the second air conditioner 60 use the thermal energy stored in the heat storage tank 30 to air-condition the specific facility F and the agricultural greenhouse AH. Furthermore, the agricultural greenhouse AH preferably has equipment for pumping groundwater, which is used for growing timber and cultivating crops. Furthermore, the agricultural greenhouse AH is preferably one for growing seedlings in a number of trees equivalent to the mass of trees that will yield X·Z / C·Y (kg) at the time of harvest.

[0058] In particular, in this embodiment, the first house AH1 is used to grow timber. Therefore, the circulation system 1 can provide electricity and an appropriate air-conditioning environment to a specific facility F, while also growing timber to obtain wood materials as fuel, thereby improving energy efficiency.

[0059] In this way, the recycling system 1 according to this embodiment uses wood materials as fuel to supply the power generated by the biomass generator 10 to a specific facility F, and uses the waste heat to air-condition the specific facility F. Furthermore, the power generated by the biomass generator 10, the air-conditioning environment created by the waste heat, and the carbon dioxide generated are also supplied to the agricultural greenhouse AH. In addition, wood is grown in the agricultural greenhouse AH to obtain the wood materials used as fuel. In other words, the recycling system 1 is designed to grow its own fuel for the biomass generator 10, which generates power and an air-conditioning environment for the specific facility F. Therefore, while supplying power and the like to the specific facility F, the system can obtain its own fuel, making it possible to improve energy efficiency.

[0060] The agricultural house AH also has a first house AH1 for cultivating lumber to obtain woody material that can be used as fuel in the biomass power generator 10, and a second house AH2 for cultivating crops. This allows not only lumber but also crops to be cultivated, and crops and lumber, which have different optimum growth environments, to be grown in separate environments.

[0061] Furthermore, let us assume that the power output of biomass generator 10 is X (kW), the power generation efficiency is Y, the planned total annual operating time is Z hours, and the calorific value of the wood material is C (kW / kg). In this case, agricultural greenhouse AH is designed to cultivate a number of seedlings equivalent to the number of trees that will yield a mass of X·Z / C·Y (kg) when harvested. As a result, when the seedlings cultivated in agricultural greenhouse AH grow, are harvested, and used for fuel, the annual fuel consumption can theoretically be covered. Therefore, a recycling system 1 can be created that is close to a complete recycling system.

[0062] The carbon dioxide supply unit 70 is structured so that gas from which impurities have been removed by a filter 72 is compressed and stored in a tank 75, and the high-temperature exhaust gas from the biomass power generator 10 is cooled in a heat storage tank 30 and then stored in the tank 75. This makes it possible to extract thermal energy from the exhaust gas, compress and store the carbon dioxide in the tank 75, and supply only the required amount to the agricultural greenhouse AH. Therefore, it is possible to store heat and carbon dioxide efficiently, and use only the required amount of carbon dioxide.

[0063] The present invention has been described above based on the above embodiment, but the present invention is not limited to the above embodiment, and modifications may be made within the scope of the spirit of the present invention, publicly known or well-known technologies may be combined as appropriate, or embodiments may be combined with each other.

[0064] For example, in the above embodiment, the agricultural house AH is configured to grow timber in the first house AH1 and cultivate crops in the second house AH2. However, this is not limiting, and the agricultural house AH may be configured to grow only timber. Furthermore, the agricultural house AH may be configured to grow multiple types of timber. [Explanation of symbols]

[0065] 1: Circulation system 10: Biomass generator 20: 1st power supply section 30: Heat storage tank 40: 1st air conditioner 50:Second power supply section (first supply structure) 60:Second air conditioner 70: Carbon dioxide supply section (second supply structure) 72: Filter 75: Tank AH: Agricultural greenhouse AH1: 1st House AH2: 2nd House F: Specific facilities HE: Heat exchanger

Claims

1. Biomass generators generate electricity by using wood materials as fuel to rotate turbines and supply power to specific facilities. a first air conditioner that performs air conditioning of the specific facility based on waste heat generated by the use of the fuel in the biomass generator; a second air conditioner that air-conditions an agricultural greenhouse in which plants are grown, using waste heat generated by the use of the fuel in the biomass generator; and a first supply structure that supplies the generated power in the biomass generator to at least one of equipment in the agricultural greenhouse and the second air conditioner; a second supply structure that supplies carbon dioxide generated by the use of the fuel in the biomass generator to the agricultural greenhouse, The agricultural greenhouse is used to grow wood to obtain woody materials that can be used as fuel in the biomass power generator. A circular system characterized by:

2. The agricultural greenhouse includes a first greenhouse for growing wood to obtain woody materials that can be used as the fuel in the biomass power generator, and a second greenhouse for cultivating crops. The circulation system according to claim 1 .

3. When the power output of the biomass generator is X kW, the power generation efficiency is Y, the calorific value of the fuel is C kW / kg, and the planned total annual operating time is Z hours, the agricultural greenhouse will grow seedlings of the number of trees equivalent in weight to obtain X Z / C Y at the time of harvesting. The circulation system according to claim 1 .

4. The biomass generator further includes a heat storage tank for storing waste heat generated by the use of the fuel, The second supply structure includes a filter that removes impurities from the exhaust gas from the biomass power generator after cooling by storing heat in the heat storage tank, and a tank that compresses and stores the gas from which the impurities have been removed by the filter. The gas in the tank is supplied to the agricultural greenhouse, thereby supplying carbon dioxide generated by the use of the fuel to the agricultural greenhouse. The circulation system according to claim 1 .

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