JP2018166451A - Stored heat utilization structure - Google Patents

Abstract

To provide a stored heat utilization structure that can uniformize an energy balance through the year.SOLUTION: A stored heat utilization structure comprises: a power generator 1; a heat storage tank 2; a heat utilization facility 3; a heat storage unit 5 which stores exhaust heat generated in the power generator 1 in the heat storage tank 2 mainly during summer; an exhaust heat utilization unit 6 which utilizes exhaust heat generated in the power generator 1 in the heat utilization facility 3 mainly during seasons from autumn until spring with winter between them; and a stored heat utilization unit 10 which takes out and utilizes the stored heat stored in the heat storage tank 2 in the heat utilization facility 3 mainly during winter in addition to the utilization of exhaust heat by the exhaust heat utilization unit 6. During summer when exhaust heat from the power generator 1 is left over, the left-over exhaust heat is stored in the heat storage tank 2, and the stored heat is taken out and utilized in winter when heat is in short supply. This makes it possible to uniformize energy balance between winter and summer.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a heat storage utilization structure that stores and uses exhaust heat generated by power generation.

In Japan, active utilization of unused thinned wood as woody biomass is now being studied. Some of them are also in operation.
After timber is cut down by main cutting or thinning, the thinned wood and branches are left unused in the forest. Then unused wood that occurs, it becomes approximately 20 million ^{m 3} per year. It has been a problem for a long time to cultivate these new demands and make effective use of them. Recently, woody biomass power generation using such thinned wood for power generation has begun.

About woody biomass power generation, there is an introduction article on the following Forestry Agency homepage.
http: // www. rinya. maff. go. jp / j / sanson / kassei / pdf / shishin_s2-2_1￣2. pdf

  Woody biomass power generation includes a “steam boiler / turbine system” with an output of 5000 kW or more and a “gasification / engine system” with an output of 100 to 2000 kW. In both methods, thinned wood, which is difficult to use for building materials, is accumulated in the stockyard, dried and processed into chips. This is supplied from the chip silo to a steam boiler or gasifier, and the generator is operated to generate electricity. Power generation waste heat is generated as a by-product of power generation. In the steam boiler / turbine system, hot water is discharged after the steam is cooled. In the gasification / engine system, hot water is discharged after the engine is cooled. Power generation waste heat is generated in the form of warm wastewater.

These power generation exhaust heat is used as energy for operating the power plant. However, excessive exhaust heat that still cannot be used is generated. This excess waste heat should be used effectively as an energy resource.
On the Forestry Agency website, a method has been proposed in which an agricultural house is attached to a power plant for woody biomass power generation, and excess waste heat is used for heating the agricultural house.

  However, several problems arise when trying to operate an agricultural house stably at the same time as woody biomass power generation.

First, in the winter when the environmental temperature is low, surplus exhaust heat alone is insufficient as a heating heat source for agricultural houses. Therefore, in order to assist the heating of the agricultural house, a heating facility must be prepared separately from the excess exhaust heat. Boilers are generally used for heating equipment, and eventually, fossil fuels such as oil are burned.
On the other hand, it is not necessary to heat the agricultural house in the summer when the environmental temperature is high. For this reason, excess exhaust heat is used up. As a result, surplus exhaust heat must be cooled, and energy is required for cooling. In order to save energy for cooling, the exhaust heat generated must be reduced. As a result, the power generation output is suppressed, and the power plant cannot operate at a stable output throughout the year. If it operates at a stable output throughout the year, excess waste heat will be discarded in the summer, making it a very wasteful facility.

  It is desirable for power plants to maintain a stable output throughout the year. However, if such power generation is continued at the woody biomass power plant, the excess exhaust heat becomes insufficient in the summer and in the winter. Thus, in the woody biomass power plant, an effective energy recycling process that balances stable power generation output and use of excess exhaust heat has not been established. In other words, there is no such woody biomass power plant that can operate the generators stably throughout the year and effectively utilize the excess exhaust heat throughout the year.

As introduced on the Forestry Agency website mentioned above, surplus waste heat generated by power generation can be used for agriculture. At that time, it is conceivable not only to use the generated exhaust heat as it is, but also to store the excess exhaust heat once in a heat storage tank and take it out for use.
As prior art documents relating to agricultural use and heat storage of such excess exhaust heat, the applicant has grasped Patent Documents 1 to 3 listed below.

Patent Document 1 has the following description.
[wrap up]
[Problem] To provide a heat storage tank capable of enhancing the heat insulation effect of stored water and suppressing heat loss.
[Solution] A tank body 13 is installed on the upper surface of the base concrete 12, and the structure of the side wall 14 and the bottom wall 15 for constructing the tank body 13 is a heat insulating structure. Porous concrete 27 as a heat insulating material is filled in the inner and outer mold panels 24 and 25 constituting the side wall 14. Porous concrete 30 as a heat insulating material is placed on the upper surface of the base concrete 12, and the bottom plate 31 is supported on the upper surface. Further, the roof 16 is constituted by an inner panel 34, a heat insulating material layer 35 and an outer panel 36.
[0024]
The heat storage tank 11 is supplied with water as a stored fluid from a water supply pipe (not shown) and stored. This water is insulated by the porous concrete 27, 30 and the heat insulating material layer 35, and the heat transfer to the outside or the heat transfer from the outside to the stored water stored in the tank is suppressed, and the heat retaining effect is enhanced.

Patent Document 2 has the following description.
[Claim 1] A substrate, a pipe disposed on a lower surface of the substrate, and a greenhouse installed on the substrate are provided, and air in the greenhouse is circulated through the pipe to perform air conditioning in the greenhouse. A floating greenhouse characterized by that.
[Publication, page 2, right column, lines 12-18]
The floating plant factory having the above-described structure is floated on the surface of water such as the sea, river, lake, etc., and the air in the plant factory 1 is exchanged by a heat exchanger using pipes utilizing the temperature difference between the temperature and the water temperature. The room can be heated and heated at night. Further, for example, by floating the water plant factory of the present invention on the surface of the water near the discharge port of the warm water discharged from the nuclear power plant or the like, the exhaust heat energy of the nuclear power plant or the like can be used effectively.

Patent Document 3 has the following description.
[Claim 1]
It is provided with an outer shell that forms a space inside, and at least a part of the outer shell is a greenhouse structure made of a light-transmitting outer peripheral material,
A temperature adjustment member is disposed in the space, and the temperature adjustment member includes a heat storage material layer and a water retention material layer laminated so as to contact the heat storage material layer. Greenhouse structure.
[Claim 4]
The greenhouse according to any one of claims 1 to 3, wherein the heat storage material layer includes at least one selected from the group consisting of mortar, concrete, asphalt, marble, brick, talc, wax, serpentine, and amphibolite. Structure.

JP 2004-60995 A Japanese Patent Publication No.7-110186 JP2013-39123A

Patent Document 1 discloses a heat storage tank. This heat storage tank uses hot water or cold water as a storage heat storage material. Many parts are made of concrete in addition to the base concrete to store hot and cold water. The inside of the side wall and the bottom wall constituting the tank main body is filled with a heat insulating material to enhance the heat insulating effect of the stored hot water or cold water, thereby suppressing heat loss. This is an example using water as a heat storage material.
However, Patent Document 1 does not mention a utilization process related to stored heat.

The above Patent Document 2 discloses a floating greenhouse. This floating greenhouse warms the greenhouse using the latent heat of water. The plant factory is floated on the surface of the water, and the air conditioning in the plant factory is performed using the temperature difference between the water temperature and the temperature. That is, a greenhouse is installed on a barge (floating body) composed of a substrate and a pipe disposed on the lower surface of the substrate, and the pipe is used for air conditioning as a heat exchanger. For example, by floating on the surface of the sea, rivers, lakes, etc., the air in the plant factory is warmed by a heat exchanger using pipes, and night heating is performed. In addition, for example, a floating plant factory is floated on the surface of the water near the discharge port of warm wastewater from a nuclear power plant or the like to disclose that waste heat energy can be effectively utilized.
However, the technique of Patent Document 2 depends on natural phenomena such as the sea, rivers, and lakes, and depends on the region and season. It does not suggest balancing energy throughout the year. In addition, as an example of the use of power generation waste heat, it only shows the warm drainage of a nuclear power plant, and there is no mention of energy balance.

The said patent document 3 discloses a greenhouse structure. This greenhouse structure uses a heat storage material layer in a so-called plastic house provided with a light-transmitting peripheral material used for facility cultivation of vegetables, fruits, garden plants and the like. It is disclosed that mortar, marble, brick, or the like is used for the heat storage material layer.
However, Patent Document 3 merely discloses the use of mortar, brick, or the like for the heat storage material layer used for the greenhouse structure.

  Thus, Patent Documents 1 to 3 merely list water, bricks, and the like as heat storage materials. It does not disclose a means for effectively using the exhaust heat generated on a scale across seasons.

〔the purpose〕
The present invention solves the above problems and has been made for the following purpose.
To provide a heat storage utilization structure that can make the energy balance uniform throughout the year.

The heat storage utilization structure of claim 1 employs the following configuration in order to achieve the above object.
A generator,
A heat storage tank,
Heat utilization facilities;
A heat storage unit for storing waste heat generated by the generator in the heat storage tank mainly during the summer season;
A waste heat utilization unit that uses the waste heat generated by the generator at the heat utilization facility, mainly from autumn to winter and between spring,
Mainly during the winter, the heat utilization facility includes a heat storage utilization unit that takes out the heat stored in the heat storage tank and uses it in addition to the use of waste heat by the waste heat utilization unit.

The heat storage utilization structure according to claim 2 adopts the following structure in addition to the structure according to claim 1.
The said heat storage utilization unit is comprised including the heat pump for taking out the heat storage stored in the heat storage tank.

The heat storage utilization structure of claim 3 employs the following structure in addition to the structure of claim 1 or 2.
The heat storage tank uses a liquid heat storage material as a heat storage material.

The heat storage utilization structure according to claim 4 adopts the following structure in addition to the structure according to claim 1 or 2.
The heat storage tank uses a solid heat storage material as a heat storage material.

In addition to the structure as described in any one of Claims 1-4, the heat storage utilization structure of Claim 5 employ | adopted the following structure.
The heat storage tank is provided in the basement, and the heat utilization facility is provided on the ground.

In addition to the structure as described in any one of Claims 1-5, the following structure was employ | adopted for the heat storage utilization structure of Claim 6.
The heat utilization facility is an agricultural facility.

The heat storage utilization structure of claim 1 stores, in the heat storage tank, waste heat generated by the power generator by the heat storage unit mainly during summer. During the summer, when the environmental temperature is high, the exhaust heat of the generator is accumulated and stored in a heat storage tank.
Mainly in autumn and spring, the heat utilization facility uses the exhaust heat generated by the generator by the exhaust heat utilization unit. In the fall and spring season, the waste heat from the generator will be used at the heat utilization facility.
Mainly during the winter, in the heat utilization facility, in addition to the use of the exhaust heat by the exhaust heat utilization unit, the heat storage utilization unit extracts and uses the heat accumulation stored in the heat storage tank. During the winter, when the environmental temperature is low, the exhaust heat from the generator alone cannot be used to cover the heat used in the heat utilization facility. Therefore, the heat stored in the heat storage tank during the summer is taken out and used.
In this way, during the summer season when the exhaust heat of the generator is full, the excess heat is stored in a heat storage tank, and the stored heat storage is taken out and used in winter when there is not enough heat. Thereby, the energy balance in winter and summer can be made uniform.

  The heat storage utilization structure according to claim 2 includes a heat pump for taking out heat storage stored in the heat storage tank by the heat storage use unit, and can efficiently take out and use the heat storage.

  The heat storage utilization structure of claim 3 is easy to install the heat storage material because the heat storage tank uses a liquid heat storage material as the heat storage material.

  In the heat storage utilization structure according to claim 4, since the heat storage tank uses a solid heat storage material as a heat storage material, the solid heat storage material maintains a certain shape, so that heat exchange can be easily designed.

  In the heat storage utilization structure of claim 5, the heat storage tank is provided in the basement, and the heat utilization facility is provided on the ground. In the basement where the heat storage tank is installed, the annual temperature change is small compared to the ground, so it is easy to design the amount of heat storage. In addition, the underground has less heat storage loss due to heat dissipation than the ground. On the ground where the heat utilization facility is provided, it is easy to use the equipment in various forms.

In the heat storage utilization structure according to claim 6, the heat utilization facility is an agricultural facility. For this reason, the exhaust heat of power generation can be used for agriculture, and surplus heat can be effectively utilized throughout the year while the generator is stably operated throughout the year.

It is a figure explaining the structure of the heat storage utilization structure of 1st Embodiment of this invention. It is a figure explaining the operation state of the said 1st Embodiment. It is a figure explaining the structure of the heat storage utilization structure of 2nd Embodiment. It is a figure explaining the operation state of the said 2nd Embodiment. It is a figure explaining the simulation used by the specific example.

  Next, an embodiment for carrying out the present invention will be described.

[First Embodiment]
FIG. 1 is a diagram illustrating a configuration of a heat storage utilization structure according to the first embodiment to which the present invention is applied.

〔Basic structure〕
The heat storage utilization structure of the first embodiment includes a generator 1, a heat storage tank 2, and a heat utilization facility 3.

〔Generator〕
As the generator 1, for example, a woody biomass generator can be applied. As the power generation method of the generator 1, a steam turbine method, a gasification-engine method, an organic Rankine cycle method, or the like can be employed. As a power generation method, a method in which warm water discharged as exhaust heat is about 70 to 80 ° C. or higher is particularly preferable. Specifically, a gasification-engine system and an organic Rankine cycle system are preferable. This is because the capacity of the heat storage tank 2 can be reduced to save construction costs.
Assuming that the temperature of the heat utilization facility 3 is room temperature, the amount of heat to be stored in the summer in the heat storage tank 2 is the product of (capacity of the heat storage tank 2) and (heat storage temperature-room temperature). For example, if the hot water discharged as exhaust heat is about 35 ° C. as in the steam turbine system, the capacity of the heat storage tank 2 is 5.5 times or more than that of the gasification-engine system or organic Rankine cycle system described above. I need it. If the heat storage tank 2 with a small capacity designed for the gasification-engine system or the organic Rankine cycle system is applied to the steam turbine system, the generator 1 cannot be cooled in the summer and the generator 1 must be stopped. It will be impossible.

[Heat storage tank]
The heat storage tank 2 is provided underground. The heat storage tank 2 contains a heat storage material 14 in the internal space. A heat insulating layer 13 is provided around the heat storage tank 2 so as to minimize the loss of heat stored in the heat storage material 14 to the surrounding ground.

  In this example, a liquid heat storage material is used as the heat storage material 14. As the liquid heat storage material, for example, water, antifreeze or the like can be used.

[Heat utilization facility]
The heat utilization facility 3 is provided on the ground. In this example, the heat utilization facility 3 is an agricultural facility. Examples of the agricultural facility include a crop cultivation facility, an animal breeding facility, a processing / preparation facility, and a storage facility. Among these, a crop cultivation facility can be suitably applied. Specifically, there are a glass room for cultivating agricultural crops, a vinyl house, a seedling facility for various crops, etc., and an accompanying irrigation device, a monorail for transportation, and the like can be included.

[Heat utilization unit]
The heat storage utilization structure of 1st Embodiment is equipped with the heat storage unit 5, the waste heat utilization unit 6, and the heat storage utilization unit 10 as a heat utilization unit.

The exhaust heat utilization unit 6 uses the exhaust heat generated in the generator 1 in the heat utilization facility 3 mainly from autumn to winter and spring.
In the figure, the exhaust heat utilization unit 6 is shown as a water pipe that is in thermal contact with the air in the heat utilization facility 3. The exhaust heat utilization unit 6 (water pipe) distributes the warm exhaust water discharged from the generator 1. The heat of the waste water is waste heat discharged from the generator 1. The exhaust heat discharged from the generator as exhaust hot water heats the air in the heat utilization facility 3 by heat exchange when the exhaust heat utilization unit 6 (water pipe) is circulated.

The heat storage unit 5 stores the exhaust heat generated in the generator 1 in the heat storage tank 2 mainly during summer.
In the figure, the heat storage unit 5 is shown as a water pipe that is in thermal contact with the heat storage material 14 of the heat storage tank 2. The heat storage unit 5 (water pipe) distributes the warm water discharged from the generator 1. The heat of the waste water is waste heat discharged from the generator 1. The exhaust heat discharged from the generator as the exhaust water is stored in the heat storage material 14 by heat exchange when flowing through the heat storage unit 5 (water pipe).

The heat storage use unit 10 takes out and uses the heat stored in the heat storage tank 2 in addition to the use of the exhaust heat by the exhaust heat use unit 6 in the heat use facility 3 mainly during the winter season.
The heat storage utilization unit 5 includes a heat pump 11 for taking out the heat stored in the heat storage tank 2, a heat absorption pipe 17, and a heat radiating pipe 18.

  As the heat pump 11, a heat pump that uses heat of vaporization and heat of condensation of the heat medium can be applied. In the figure, the heat absorption pipe 17 is shown as a flow pipe in thermal contact with the heat storage material 14 of the heat storage tank 2. In the same figure, the heat radiating pipe 18 is shown as a circulation pipe that is in thermal contact with the air in the heat utilization facility 3.

  A heat medium having a reduced pressure and a temperature lower than that of the surroundings is circulated through the heat absorption pipe 17 to exchange heat with the heat storage material 14 of the heat storage tank 2, and the heat stored in the heat storage material 14 is absorbed by the heat medium. The heat medium absorbed by the heat absorption tube 17 is pressurized to increase the temperature and circulate through the heat dissipation tube 18. The air in the heat utilization facility 3 is heated by heat exchange when the heat medium heated by pressurization flows through the heat radiating pipe 18.

  In the illustrated example, the generator 1 and the heat pump 11 are accommodated in an equipment room 8 constructed on the ground.

[Operation]
FIG. 2 is a diagram illustrating an operational state of the heat storage utilization structure of the first embodiment. (A) shows the operational state in the summer, (B) shows the operational state in the spring and autumn, and (C) shows the operational state in the winter.

  As shown in FIG. 2A, the exhaust heat generated by the generator 1 is stored in the heat storage tank 2 by the heat storage unit 5 during the summer. Waste heat water discharged from the generator 1 is circulated through the heat storage unit 5 (water pipe), and waste heat discharged from the generator 1 (heat of waste water) is stored in the heat storage material 14 by heat exchange.

  As shown in FIG. 2 (B), in the spring and autumn, the exhaust heat generated in the generator 1 is used in the heat utilization facility 3 by the exhaust heat utilization unit 6. Waste heat water discharged from the generator 1 is circulated to the waste heat utilization unit 6 (water pipe), and the air in the heat utilization facility 3 is heated by the waste heat discharged from the generator 1 (heat of the waste water temperature).

  As shown in FIG. 2C, in the winter season, the exhaust heat generated in the generator 1 is used in the heat utilization facility 3 by the exhaust heat utilization unit 6 in the same manner as in the spring and autumn periods described above. At the same time, the heat storage use unit 10 takes out and uses the heat stored in the heat storage tank 2.

In the exhaust heat utilization unit 6, the air in the heat utilization facility 3 is heated by the exhaust heat (heat of exhaust water) discharged from the generator 1 as in the above-described spring and autumn periods.
In the heat storage utilization unit 10, by the operation of the heat pump 11, the heat medium whose pressure is reduced and the temperature is lowered from the surroundings is circulated through the heat absorption pipe 17, and the heat stored in the heat storage material 14 is absorbed by the heat medium. The heat medium absorbed by the heat absorption tube 17 is pressurized to raise the temperature and circulate through the heat radiating tube 18 (hot water) to heat the air in the heat utilization facility 3. It is also possible to heat the air in the heat utilization facility 3 by circulating hot air from the heat pump 11 instead of the heat radiating pipe 18 (warm water).

[Effects of First Embodiment]
The heat storage utilization structure of the first embodiment has the following operational effects.

The heat storage utilization structure of the first embodiment stores waste heat generated by the power generator by the heat storage unit in the heat storage tank mainly during summer. During the summer, when the environmental temperature is high, the exhaust heat of the generator is accumulated and stored in a heat storage tank.
Mainly in autumn and spring, the heat utilization facility uses the exhaust heat generated by the generator by the exhaust heat utilization unit. In the fall and spring season, the waste heat from the generator will be used at the heat utilization facility.
Mainly during the winter, in the heat utilization facility, in addition to the use of the exhaust heat by the exhaust heat utilization unit, the heat storage utilization unit extracts and uses the heat accumulation stored in the heat storage tank. During the winter, when the environmental temperature is low, the exhaust heat from the generator alone cannot be used to cover the heat used in the heat utilization facility. Therefore, the heat stored in the heat storage tank during the summer is taken out and used.
In this way, during the summer season when the exhaust heat of the generator is full, the excess heat is stored in a heat storage tank, and the stored heat storage is taken out and used in winter when there is not enough heat. Thereby, the energy balance in winter and summer can be made uniform.

  The heat storage utilization structure of 1st Embodiment contains the heat pump for taking out the heat storage by which the said heat storage utilization unit was stored in the heat storage tank, and can take out and use heat storage efficiently.

  In the heat storage utilization structure of the first embodiment, since the heat storage tank uses a liquid heat storage material as a heat storage material, installation of the heat storage material is easy.

  In the heat storage utilization structure of the first embodiment, the heat storage tank is provided underground, and the heat utilization facility is provided above the ground. In the basement where the heat storage tank is installed, the annual temperature change is less than that on the ground, so it is easy to design the amount of heat storage. In addition, the underground has less heat storage loss due to heat dissipation than the ground. On the ground where the heat utilization facility is provided, it is easy to use the equipment in various forms.

  In the heat storage utilization structure of the first embodiment, the heat utilization facility is an agricultural facility. For this reason, the exhaust heat of power generation can be used for agriculture, and surplus heat can be effectively utilized throughout the year while the generator is stably operated throughout the year.

[Second Embodiment]
FIG. 3 is a diagram illustrating a heat storage utilization structure according to the second embodiment to which the present invention is applied.
In the second embodiment, the heat storage tank 2 uses a solid heat storage material as the heat storage material 14.

In the heat storage tank 2 of this example, a solid heat storage material is accommodated in the internal space.
In this example, the heat storage unit 5 (water pipe) is disposed near the surface of the solid heat storage material so as to be in thermal contact with the solid heat storage material.
A heat pump 11 constituting the heat storage utilization unit 10 is accommodated in the underground heat storage tank 2. The heat absorption pipe | tube 17 which comprises the heat storage utilization unit 10 is arrange | positioned in the surface vicinity of the solid heat storage material so that it may contact with the said solid heat storage material thermally.

  As the solid heat storage material, various materials can be used. For example, brick, concrete, mortar, stone and the like can be used.

  Other than that is the same as that of the said 1st Embodiment, and attaches | subjects the same code | symbol to the same part.

[Operation]
FIG. 4 is a diagram illustrating an operational state of the heat storage utilization structure of the second embodiment. (A) shows the operational state in the summer, (B) shows the operational state in the spring and autumn, and (C) shows the operational state in the winter.

  As shown in FIG. 4A, the exhaust heat generated by the generator 1 is stored in the heat storage tank 2 by the heat storage unit 5 during the summer. Waste heat water discharged from the generator 1 is circulated through the heat storage unit 5 (water pipe), and waste heat discharged from the generator 1 (heat of waste water) is stored in the heat storage material 14 by heat exchange.

  As shown in FIG. 4 (B), in the spring and autumn, the exhaust heat generated in the generator 1 is used in the heat utilization facility 3 by the exhaust heat utilization unit 6. Waste heat water discharged from the generator 1 is circulated to the waste heat utilization unit 6 (water pipe), and the air in the heat utilization facility 3 is heated by the waste heat discharged from the generator 1 (heat of the waste water temperature).

  As shown in FIG. 4C, in the winter season, the exhaust heat generated in the generator 1 is used in the heat utilization facility 3 by the exhaust heat utilization unit 6 in the same manner as in the spring and autumn seasons described above. At the same time, the heat storage use unit 10 takes out and uses the heat stored in the heat storage tank 2.

In the exhaust heat utilization unit 6, the air in the heat utilization facility 3 is heated by the exhaust heat (heat of exhaust water) discharged from the generator 1 as in the above-described spring and autumn periods.
In the heat storage utilization unit 10, by the operation of the heat pump 11, the heat medium whose pressure is reduced and the temperature is lowered from the surroundings is circulated through the heat absorption pipe 17, and the heat stored in the heat storage material 14 is absorbed by the heat medium. The heat medium absorbed by the heat absorption tube 17 is pressurized to raise the temperature and circulate through the heat radiating tube 18 (hot water) to heat the air in the heat utilization facility 3. It is also possible to heat the air in the heat utilization facility 3 by circulating hot air from the heat pump 11 instead of the heat radiating pipe 18 (warm water).

[Effects of Second Embodiment]
In the heat storage utilization structure of the second embodiment, since the heat storage tank uses a solid heat storage material as a heat storage material, the solid heat storage material maintains a certain shape, so that heat exchange can be easily designed.
Other than that, there exists an effect similar to the said 1st Embodiment.

〔Concrete example〕
A specific example of the heat storage utilization structure described above will be described.

  This specific example is a model in which the heat utilization facility 3 in each of the above-described embodiments is an agricultural house, and surplus exhaust heat generated from woody biomass power generation is used for the agricultural house. The generator 1 used for woody biomass power generation employs a gasification-engine system in which the temperature of the hot waste water that generates exhaust heat becomes 80 ° C.

In this specific example, excessive surplus heat is stored even when used in an agricultural house, mainly in summer. This heat storage is used to heat agricultural houses, mainly in winter.
In other words, it is a heat storage process that can be used throughout the year by flexibly responding to changes in the environmental temperature due to seasonal changes when surplus waste heat generated from woody biomass power generation is effectively used for heating an agricultural house.

In spring and autumn, if the generated heat is used as it is for heating the agricultural house, the energy balance will match.
In summer, when the outside air temperature is high, heating of the agricultural house is no longer necessary. Since the generated heat exhaust heat becomes surplus exhaust heat as it is, it is stored in the heat storage tank 2.
In winter, when the outside air temperature is low, heating of the agricultural house is not enough with just the heat generated from the power generation, so the heat stored in the heat storage tank 2 is taken out and supplemented.

  FIG. 5 shows a diagram of the basic concept of heat calculation used in this specific example and its calculation method. The following simulation is performed based on this basic concept and calculation method.

[Simulation 1]
First, the heat storage tank 2 was provided in the basement, and was in the form of a pool using water as a heat storage material. The heat pump 11 is used only in winter.
It was assumed to be installed in Sapporo, one of the typical cold regions in Japan.

  Table 1 shows the result of simulation by the above method.

Based on the average monthly temperature in Sapporo City from January to December, we examined the heat input and output with this system. The temperature in the farmhouse is 25 ° C throughout the year, the area is 46225 m ² , the power generation capacity is 689 kW, the depth of the underground pool is 2.5 m, and the insulation of the underground pool is 10 cm styrofoam and heat pump of 0.36 W / m ² · ° C The COP was 3.0. The average monthly temperature of Sapporo City used here is based on the “Data / Materials” (http://www.jma.go.jp/jma/menu/menuport.html) item on the website of the Japan Meteorological Agency. The values indicated by the normal value for each month (statistical period: 1981 to 2010) were used. In August, power generation was stopped for regular power generation maintenance.

  As can be seen from the results in Table 1, it is possible to operate in this specific example even in Sapporo, one of the typical cold regions in Japan. Further, for example, in an area where the water temperature of the underground pool fluctuates from this case, it is possible to cope by adjusting the water level of the underground pool.

[Simulation 2]
Next, we examined the use of brick as a heat storage material in the underground process.
In this case, it is assumed that the heat pump 11 is installed in the basement, and heat is exchanged between the brick portion and the heat pump 11 with air. The bricks used here are, for example, JIS R1250 ordinary brick, JIS A5213 building brick, JIS R2204 refractory brick of Japanese Industrial Standard (JIS), put clay, shale, mud in a mold, baked and hardened in a kiln, or compressed Is made. The heat pump 11 is driven only in winter.

  Table 2 shows the simulation results assuming that this specific example is performed in Sapporo as in the previous example.

Based on the average monthly temperature in Sapporo City from January to December, we examined the heat input and output with this system. The temperature in the agricultural house is 25 ° C. throughout the year, the area is 44100 m ² , the power generation capacity is 689 kW, the total thickness of the brick is 2.5 m, the specific heat of the brick is 1.0 kJ / kg · ° C., and the heat insulation of the basement is 0.00. The COP of a 10 cm styrofoam and heat pump of 36 W / m ² · ° C. is obtained as 3.0. In August, power generation was stopped for regular power generation maintenance.

  As can be seen from the results in Table 1, it is possible to operate in this specific example even in Sapporo, one of the typical cold regions in Japan.

[Effects of specific examples]
In this specific example, surplus exhaust heat generated from woody biomass power generation can be effectively used without inputting extra fossil fuel-derived energy from the outside. This is a heat storage process that can be used throughout the year by heating agricultural houses using surplus waste heat and flexibly responding to changes in the outside air temperature due to seasonal changes. It can be applied to a cultivation system with a uniform energy balance throughout the year.

[Modification]
The above has described a particularly preferred embodiment of the present invention. However, the present invention is not intended to be limited to the illustrated embodiment, and can be implemented by being modified in various aspects, and the present invention includes various modifications. This is the purpose.

For example, general materials such as water and concrete can be used as the heat storage material. Other, magnesium hydroxide Mg _{(OH) 2} and calcium hydroxide Ca _{(OH) 2,} erythritol _C 4 _H 10 _{O 4,} sodium acetate trihydrate _{CH 3 COO 4 Na · 3H 2} O, sodium 10 sulfate dihydrate Chemical substances such as Na ₂ SO ₄ .10H ₂ O can be used.

In each embodiment mentioned above, from the viewpoint of storing the excess waste heat of woody biomass power generation, it selected from the thing which can increase a certain amount of capacity and can satisfy the cost aspect.

1: Generator 2: Heat storage tank 3: Heat utilization facility 5: Heat storage unit 6: Waste heat utilization unit 8: Equipment room 10: Heat storage utilization unit 11: Heat pump 13: Heat insulation layer 14: Heat storage material 17: Heat absorption pipe 18: Heat radiation tube

Claims (6)

A generator,
A heat storage tank,
Heat utilization facilities;
A heat storage unit for storing waste heat generated by the generator in the heat storage tank mainly during the summer season;
A waste heat utilization unit that uses the waste heat generated by the generator at the heat utilization facility, mainly from autumn to winter and between spring,
In the heat utilization facility mainly during the winter, in addition to the use of exhaust heat by the exhaust heat utilization unit, a heat storage utilization unit for taking out and using the heat accumulation stored in the heat storage tank is provided. Usage structure. The heat storage utilization structure according to claim 1, wherein the heat storage utilization unit is configured to include a heat pump for taking out heat accumulation stored in the heat storage tank. The heat storage utilization structure according to claim 1 or 2, wherein the heat storage tank uses a liquid heat storage material as a heat storage material. The heat storage utilization structure according to claim 1 or 2, wherein the heat storage tank uses a solid heat storage material as a heat storage material. The heat storage utilization structure according to any one of claims 1 to 4, wherein the heat storage tank is provided in the basement, and the heat use facility is provided on the ground. The heat storage facility according to any one of claims 1 to 5, wherein the heat utilization facility is an agricultural facility.

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