JP3530415B2 - Thermal storage system and auxiliary tank - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat storage system, a heat storage tank, which is applied to, for example, heat storage equipment for air conditioning, heat storage equipment for district heating and cooling facilities, heat storage equipment for intake cooling devices of gas turbine power generation facilities, and heat source equipment for industry , An auxiliary tank, and a stratified temperature type heat storage tank.

[0002]

2. Description of the Related Art As a heat storage method in a conventional heat storage system, there are a water heat storage method in which heat is stored only by using sensible heat of water, and an ice heat storage method in which water is used as a heat storage material and the latent heat of melting of water is used. Are known. In this ice heat storage method, brine (antifreeze) cooled to 0 ° C or less during heat storage
The cold heat is stored as ice by cooling the water by using, and the cold heat is taken out by directly using the cold water at the time of heat radiation or indirectly by melting the ice through the brine.

In this conventional heat storage system using the latent ice heat method, it is necessary to cool the brine to about -5 ° C. in the refrigerator when heat is stored, so that it is necessary to lower the refrigerant evaporation temperature of the refrigerator. The ratio of the amount of heat stored to the input of the refrigerator, that is, the coefficient of performance, becomes low. In addition, it is necessary to use brine when cooling the ice, and care must be taken when managing it.

As another example of the latent heat storage system, the latent heat of melting and solidification of a latent heat storage substance that changes in phase at normal temperature is used, and the latent heat storage substance is enclosed as a core substance in a capsule or container to cool water or Cold heat is stored as a solid by cooling with brine, or hot water as a liquid by heating with hot water, and at the time of heat radiation, the latent heat storage substance is indirectly melted to cool the cold heat and solidify the hot heat. The method is known. When using this latent heat storage substance that undergoes a phase change at room temperature, it is necessary to enclose it in a capsule or container from the viewpoint of handling such as when the latent heat storage substance is volatile or used in a eutectic salt solution. .

On the other hand, as these capsules and containers, spherical ones having a diameter of 70 mm and rectangular or plate-like containers having a side of several tens of cm are used, and they are filled in a heat storage tank and used in a stationary state. Then, the space between the heat storage tank container and these capsules or containers is filled with water or brine.

[0006] In such a stationary capsule system and container system, at the time of heat storage and heat dissipation, between these capsules and containers (hereinafter referred to as a heat storage material container) and a heat medium fluid such as water, or heat storage. The thermal resistance between the wall of the material container and the latent heat storage material is large. Therefore, the temperature difference between the temperature of the latent heat storage substance heated at the time of heat dissipation and the temperature of the latent heat storage substance cooled at the time of heat storage and the temperature of the heat transfer fluid used such as water needs to be about 5 ° C. or more in each state. Yes, the temperature of the heat transfer fluid used such as water during heat storage and heat dissipation is 10
It is necessary to provide a temperature difference of ℃ or more. That is, when trying to extract cold water at 5 ° C, it is necessary to cool it with brine at -5 ° C during heat storage. Also, if you try to store heat at a temperature level that does not use brine, the cold water extraction temperature will be 1
The temperature becomes 0 ° C or higher, which makes it difficult to use directly for general air conditioning.

In order to solve the problem of the system by such a latent heat storage method, a microcapsule formed by enclosing a latent heat storage substance in a microcapsule as a core substance is mixed with water to form a slurry state and fluidity. With (below,
This slurry is called a microcapsule slurry), and a system having improved heat transfer performance is known. In this system, when heat is stored, the microcapsule slurry is cooled by exchanging heat with cold water or brine by a heat exchanger to store cold heat in the latent heat storage substance in the microcapsules. In addition, at the time of heat radiation, similarly, the microcapsule slurry is heated by returning heat to the cold water or brine by a heat exchanger to take out cold heat from the latent heat storage substance in the microcapsules.

In such a microcapsule slurry system, the microcapsules themselves flow and exchange heat with the heat transfer fluid via the heat transfer surface, which is sufficiently higher than that of the stationary heat storage material container system described above. A heat transfer coefficient can be obtained, and it becomes possible to obtain a heat storage / radiation temperature close to the value of a general fluid such as water and close to the melting point and freezing point of the latent heat storage substance.

[0009]

Problems to be Solved by the Invention (First Problem) FIG.
FIG. 4 is a side sectional view showing a configuration of a stratified temperature type heat storage tank applied to a heat storage system by the water heat storage method according to the first conventional example. In this heat storage tank 201, for example, at the time of cold heat storage at night, the hot water after heat dissipation sucked from the inside of the heat storage tank 201 via the upper inflow / outflow device 202 is cooled in a heat exchanger (not shown), and the lower inflow / outflow Heat storage tank 2 via the container 203
Returned to 01. By continuing this circulation, the inside of the heat storage tank 201 is replaced with hot water after radiating heat, and heat storage is completed.

The inflow and outflow devices 202 and 203 provided in the upper and lower parts of the heat storage tank 201 shown in FIG. 15 are disc-shaped, and have a structure in which water 204 flows out and flows in horizontally from the side surface thereof. To make eggplant, water 204 is stored in the heat storage tank 2
Radially flows in and out in the direction of the cylindrical cross section of 01. That is,
Water flows in and out so as to be orthogonal to the stratification temperature in the height direction in the heat storage tank 201, and in order to suppress mixing, generally, there is no partial velocity in the height direction.

Therefore, when this heat storage tank is applied to a heat storage method using a fluid such as water or microcapsule slurry, the fluid discharged along the side surfaces of the inflow / outflow devices 203 and 202 is stored in the heat storage tank 211. Mixing occurs during ascending or descending, and uniform temperature stratification in the height direction cannot be obtained. Further, since the fluid does not go around above the inflow / outflow device 202 and below the inflow / outflow device 203, the space between the ceiling end plate 205 and the upper inflow / outflow device 202, and between the bottom end plate 206 and the lower outflow / inflow device 203. There is a problem that a dead water region is generated between them and this region cannot be effectively used for heat storage and heat dissipation.

(Second Problem) FIG. 16 is a diagram showing a structure of a stratified temperature type heat storage tank and an expansion tank applied to a heat storage system by a water heat storage method according to a second conventional example. In this heat storage system, for example, during cold heat storage at night, the heat storage tank 30
Fluid 302 sucked up from 1 is a heat exchanger (not shown)
In the heat storage tank 301 and returned to the heat storage tank 301. By continuing this circulation, the inside of the heat storage tank 301 is replaced with the cooled fluid, and the heat storage is completed.

Generally, a fluid expands and contracts with a change in temperature and a change in phase. On the other hand, in the case of the closed type heat storage tank, in order to absorb the expansion and contraction due to the temperature change and the phase change, the influence on the economical efficiency is larger than that of the water single phase, and it is necessary to devise the expansion tank.

In the heat storage system shown in FIG. 16, the heat storage tank 3
01 is provided separately from the expansion tank 303, and the top of the heat storage tank 301 and the bottom of the expansion tank 303 are connected to the pipe 304.
Connected by. In this system, the heat storage tank 30
When the fluid 302 in 1 expands, the fluid of the increased capacity is introduced from the upper part of the heat storage tank 301 into the expansion tank 303 through the pipe 304, and conversely, the fluid 302 in the heat storage tank 301 contracts. The fluid of the reduced volume is introduced from the expansion tank 303 into the heat storage tank 301 through the pipe 304.

In such a conventional expansion tank, it is necessary to install the expansion tank at a position higher than the heat storage tank, and the installation position of the expansion tank becomes high. Further, the heat storage tank also needs to enhance the pressure resistance of the liquid column head from the liquid surface of the expansion tank to the top of the heat storage tank, which causes a problem in economic efficiency.

When a microcapsule slurry formed by enclosing a phase-changing core substance in microcapsules is used as a heat storage material, the microcapsule slurry in the expansion tank is exposed to the atmosphere. The higher the concentration of the microcapsule slurry, the more the moisture evaporates and the microcapsules aggregate to form a thin film when exposed to the atmosphere. For this reason,
The thin film covers the surface of the slurry that comes into contact with the atmosphere, and eventually solidifies, and the slurry is blocked in the expansion tank. As a result, the expansion tank cannot cope with the expansion and contraction of the slurry in the heat storage tank, and the slurry deteriorates.

(Third Problem) FIG. 17 is a diagram showing a structure of a slurry circulation circuit in a heat storage system using a microcapsule slurry according to a third conventional example. In this heat storage system, when the cold heat is stored at night in summer, the heat storage tank 401
The microcapsule slurry 402 sucked up from the microcapsule slurry is cooled by exchanging heat with cold water in the heat exchanger 404 through the slurry circulation circuit 403, and stores cold heat when the latent heat storage substance of each microcapsule slurry changes to a solid phase. The heat storage tank 401 through the slurry circulation circuit 403
Returned inside. By continuing this circulation, in the heat storage tank 401, the latent heat storage substance of each microcapsule is replaced with the microcapsule slurry that has changed to the solid phase, and the heat storage is completed.

When heat is dissipated in the daytime, the slurry circulation circuit 403 is switched to supply each microcapsule in which the latent heat storage material has changed to the solid phase to the heat exchanger 404. In the heat exchanger 404, the cold water circulation circuit 405 is switched to exchange heat between the cold water returning from the load side (for example, 12 ° C.) and the microcapsule slurry, and the latent heat storage substance of each microcapsule changes to the liquid phase. Apply cold to cold water. This cold water is supplied to the load side as feed cold water (for example, 5 ° C.). The temperature of the microcapsule slurry in which the latent heat storage substance of each microcapsule has undergone a phase change is heated and returned to the heat storage tank 401.

In such a slurry circulation circuit, since the heat capacity of the microcapsule slurry is large, a large amount of slurry retains a large amount of heat.

Therefore, when the microcapsule slurry is at room temperature (about air temperature) at the start of heat storage and heat radiation, the temperature of the slurry in the pipe depends on the predetermined value of the slurry flowing in the pipe when heat storage and heat radiation are being performed. It is higher than the temperature. Therefore, when heat storage and heat dissipation are started in this state,
By the time the temperature of the slurry in the pipe drops to the predetermined temperature, the slurry having a temperature higher than the predetermined temperature flows into the heat storage tank. As a result, normal heat storage and heat radiation are not started promptly, which becomes a factor of lowering heat storage and heat radiation efficiency.

(Fourth Problem) As the quality control of the above-mentioned microcapsule slurry, in addition to the general water quality control of pH and electric conductivity, the concentration of the core substance released in the slurry due to the collapse of the microcapsules is controlled. There is a need to.

The core material of paraffin encapsulated in microcapsules is expensive, and the useful life of the microcapsules after encapsulation is about 25 years. Under such usage conditions,
The film forming the microcapsules may be disintegrated due to deterioration over time, expansion and contraction due to phase change of the core substance, or friction with the inner wall of the pipe. When the film of the microcapsules collapses, the core substance inside the microcapsules is released into the slurry. Since the liberated core substance mainly contains aliphatic hydrocarbons and the like, if attached to the heat transfer surface of the heat exchanger, the heat exchange performance is deteriorated. Therefore, in the heat storage system using the microcapsule slurry, it is necessary to keep the oil content per liter of slurry below the specified value in order not to deteriorate the performance of the heat exchanger, and the oil content in the slurry must be measured appropriately. .

The objects of the present invention are as follows.

(1) To provide a heat storage system and a heat storage tank that can be effectively used for storing and radiating heat in the heat storage tank.

(2) To provide an economical heat storage tank, auxiliary tank, and stratification temperature type heat storage tank for large expansion and contraction of the slurry, and to cope with large expansion and contraction of the slurry freely, and To provide a heat storage system, a heat storage tank, and an auxiliary tank that prevent deterioration of the slurry.

(3) Heat storage, stable heat storage from the start of heat dissipation,
To provide a heat storage system capable of radiating heat and improving heat storage and heat radiation efficiency.

(4) To provide a heat storage system capable of measuring oil content in slurry and enabling sound maintenance management.

[0028]

In order to solve the above problems and achieve the object, the heat storage system and the auxiliary tank of the present invention are configured as follows.

[0029]

[0030]

( 1 ) The heat storage system according to the present invention is a heat storage system that uses a slurry composed of a fine capsule in which a core substance accompanied by a phase change is enclosed and a liquid as a heat storage material. And, according to expansion and contraction of the slurry in the heat storage tank, a closed type auxiliary tank for inflowing the slurry from the heat storage tank and outflowing the slurry to the heat storage tank, and circulating the slurry in the heat storage tank. And a heat exchanger for exchanging heat between the slurry and the heat utilization medium circulated by the circulation circuit, wherein the slurry in the auxiliary tank is stored in the heat storage system. Cool with return water to.

( 2 ) The heat storage system of the present invention is a heat storage system that uses a slurry composed of a fine capsule in which a core substance accompanied by a phase change is enclosed and a liquid as a heat storage material. And, according to expansion and contraction of the slurry in the heat storage tank, a closed type auxiliary tank for inflowing the slurry from the heat storage tank and outflowing the slurry to the heat storage tank, and circulating the slurry in the heat storage tank. And a heat exchanger for exchanging heat between the slurry and the heat utilization medium circulated by the circulation circuit, the auxiliary tank comprising:
A container and a diaphragm member provided in the container are provided, and the diaphragm member is immersed in the container so that the inside of the diaphragm member is sealed by a fluid, depending on the expansion and contraction of the slurry in the heat storage tank. Then, the slurry flows from the heat storage tank and the slurry flows out to the heat storage tank.

( 3 ) The heat storage system of the present invention has the above ( 2 )
The system according to claim 1, wherein the fluid is return water to the heat storage system.

( 4 ) The auxiliary tank of the present invention is a hermetically sealed auxiliary tank that allows the slurry to flow from the heat storage tank and to flow out of the slurry to the heat storage tank according to the expansion and contraction of the slurry in the heat storage tank. A container and a diaphragm member provided in the container are provided, and the diaphragm member is immersed in the container so that the inside of the diaphragm member is sealed by a fluid.

( 5 ) The heat storage system of the present invention is a heat storage system which uses a slurry composed of a fine capsule in which a core substance accompanied with a phase change is enclosed and a liquid as a heat storage material. And, according to expansion and contraction of the slurry in the heat storage tank, a closed type auxiliary tank for inflowing the slurry from the heat storage tank and outflowing the slurry to the heat storage tank, and circulating the slurry in the heat storage tank. And a heat exchanger for exchanging heat between the slurry and the heat utilization medium circulated by the circulation circuit, the auxiliary tank comprising:
It is integrally installed on the upper part of the heat storage tank and includes a diaphragm member provided in the container, and in the container, the slurry is sealed by the diaphragm member, depending on the expansion and contraction of the slurry in the heat storage tank. Then, the slurry flows from the heat storage tank and the slurry flows out to the heat storage tank.

( 6 ) The heat storage system of the present invention is a heat storage system which uses a slurry composed of a microcapsule containing a core substance accompanied with a phase change and a liquid as a heat storage material. And a heat exchanger for exchanging heat between the slurry and the heat utilization medium, a slurry circulation circuit for connecting the heat exchanger and the heat storage tank, and circulating the slurry in the heat storage tank. A pump that circulates the slurry in the circulation circuit, a bypass circuit that heat-exchanges the slurry in the heat exchanger without flowing the slurry into the heat storage tank, and a heat storage start or heat release start After circulating in the bypass circuit to lower or raise the temperature of the slurry to a predetermined temperature, the slurry is circulated in the slurry circulation circuit to store the heat. A control unit for flow into equipped with a.

( 7 ) The heat storage system of the present invention has the above ( 6 )
The system according to claim 1, wherein the bypass circuit is
By-pass pipes connected to the two pipes of the circulation circuit connected to the heat storage tank, two temperature detection means provided in each of the two pipes, for detecting the temperature of the slurry in each pipe, One set of a first shutoff valve provided in one pipe, and at least one second shutoff valve provided in the bypass pipe, wherein the control unit is configured to detect the temperature. Controlling to open and close the first shutoff valve and the second shutoff valve individually based on the detection result of the means to flow the slurry in the circulation circuit into the bypass pipe and then into the heat storage tank. To do.

( 8 ) The heat storage system of the present invention is a heat storage system which uses a slurry composed of a fine capsule in which a core substance accompanied by a phase change is enclosed and a liquid as a heat storage material, in which the slurry is stored. And a circulation circuit for circulating the slurry in the heat storage tank, a heat exchanger for exchanging heat between the slurry and the heat utilization medium circulated by the circulation circuit, and a slurry in the heat storage tank According to the expansion and contraction of the heat storage tank, a closed type auxiliary tank for inflowing the slurry from the heat storage tank and flowing out the slurry to the heat storage tank, and the slurry provided with the operation of the auxiliary tank, provided on the top of the heat storage tank. And a extractor for extracting the slurry contained in at least one of the collection tank and the auxiliary tank.

[0039]

[0040]

[0041]

[0042]

[0043]

[0044]

[0045]

[0046]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) FIG. 1 is a diagram showing a configuration of a heat storage system according to a first embodiment of the present invention. This heat storage system is applied to district cooling and heating equipment, and as shown in Fig. 1, a heat storage tank (latent heat storage tank)
1, a heat exchanger 2, a slurry circulation circuit 3, a cold water circulation circuit 4, a refrigerator 5, and the like.

The heat storage tank 1 is a container for accommodating a microcapsule slurry 11 in which numerous microcapsules are mixed with water at a predetermined concentration to form a slurry state. Each microcapsule contains
A core material, which mainly contains a latent heat storage material that changes phase at room temperature and stores latent heat, is enclosed. A mixture of aliphatic hydrocarbons (paraffinic hydrocarbons), for example, a mixture of tetradecane and pentadecane is used as the latent heat storage substance, and melamine resin is used as the film of the microcapsules. The particle size of one microcapsule is preferably about 1 to 2 μm, but it is practical if it is about 20 μm or less.

A heat exchanger 2 is connected to the heat storage tank 1 via a slurry circulation circuit 3 equipped with a slurry pump 6. Further, an evaporator 51 in the refrigerator 5 is connected to the heat exchanger 2 via a cold water circulation circuit 4 equipped with a cold water pump 8.

Therefore, during heat storage and heat dissipation, the slurry pump 6 is operated to supply the microcapsule slurry 11 in the heat storage tank 1 to the heat exchanger 2 through the slurry circulation circuit 3. Further, the cold water pump 7 or 8 is operated to supply cold water to the heat exchanger 2 through the cold water circulation circuit 4. As a result, in the heat exchanger 2, the microcapsule slurry 1
Heat can be exchanged between 1 and cold water.

For example, when heat is stored at night, the microcapsule slurry 11 sucked up from the heat storage tank 1 is used as the heat exchanger 2.
In the above, the water is cooled by exchanging heat with cold water, and when the latent heat storage substance of each microcapsule changes to a solid phase, it stores cold heat and is returned to the heat storage tank 1. By continuing this circulation, the latent heat storage substance of each microcapsule is replaced with the microcapsule slurry that has changed to the solid phase in the heat storage tank 1, and the heat storage is completed.

When heat is dissipated in the daytime, the slurry circulation circuit 3 is switched to supply each microcapsule 11 in which the latent heat storage substance has changed to the solid phase to the heat exchanger 2. In the heat exchanger 2, the cold water circulation circuit 4 is switched to exchange heat between the return cold water (12 ° C.) from the load side and the microcapsule slurry to cool the latent heat storage substance of each microcapsule into a liquid phase. To cold water. This cold water is supplied to the load side as feed cold water (5 ° C.). The temperature of the microcapsule slurry 11 in which the latent heat storage material of each microcapsule has undergone a phase change is heated and returned to the heat storage tank 1.

The refrigerator 5 is operated by using inexpensive electric power at night, and the cold water generated in the evaporator 51 is transferred to the heat exchanger 2
Supply to. The heat taken by the evaporator 51 is transferred to the compressor 5
2 and the condenser 53, and then is discarded from the cooling tower 9.

FIG. 2 is a side sectional view showing the structure of the heat storage tank 1. The heat storage tank 1 has a cylindrical shape, and an upper part thereof is composed of a ceiling mirror plate 21 and a lower part thereof is composed of a bottom mirror plate 22. Outflow / inflow devices (reverse flow outflow / inflow devices) 23 and 24 are provided above and below the heat storage tank 1, respectively. The ceiling mirror plate 21 and the bottom mirror plate 22 each have a flat plate shape or a uniformly curved shape.

FIGS. 3 (a) and 3 (b) are perspective views of the inflow / outflow devices 23 and 24 seen from diagonally above and diagonally below, respectively. The inflow / outflow devices 23 and 24 are composed of a single header ring 211 or 211 having an annular (or polygonal) shape. On the upper surface of the inflow / outflow device 23, that is, the surface facing the ceiling mirror plate 21, a plurality of holes 213 are provided so as to form an annular shape as a whole. Similarly, on the lower surface of the inflow / outflow device 24, that is, on the surface facing the bottom mirror plate 22, a plurality of holes 213 are provided so as to form an annular shape as a whole.

In the heat storage tank 1 having such a structure, during cold heat storage, the microcapsule slurry circulating in the slurry circulation circuit 3 is passed through the holes 213 of the lower inflow / outflow port 24 to the bottom end plate 22 in the heat storage tank 1. Flowing in, the flow is reversed at the bottom end plate 22, and rises from the outside and inside of the header ring 211 of the inflow / outflow device 24. The flow of the microcapsule slurry that has risen in the heat storage tank 1 is reversed in the vicinity of the ceiling end plate 21 due to the suction force from the outflow / inflow device 23 side, and from each hole of the inflow / outflow device 23 to the pipe 31 of the slurry circulation circuit 3. To be leaked.

When heat is dissipated in cold heat, on the contrary, the microcapsule slurry flows into the ceiling mirror plate 21 in the heat storage tank 1 from the respective holes of the upper inflow / outflow port 23, and the flow is reversed by the ceiling mirror plate 21 to flow in and out. Descend from the outside and inside of the header ring 211 of the container 23. The flow of the microcapsule slurry descending in the heat storage tank 1 is reversed in the vicinity of the bottom end plate 22 due to the suction force from the outflow / inflow device 24 side, and the holes of the inflow / outflow device 24 are transferred to the pipe 32 of the slurry circulation circuit 3. To be leaked.

In this case, a uniform velocity distribution in the height direction can be obtained with respect to the rising or falling speed of the microcapsule slurry, so that uniform temperature stratification can be obtained in the heat storage tank 1, and the ceiling mirror plate 21 and the upper part can be obtained. The dead water area between the bottom end plate 22 and the bottom inflow / outflow device 24 is reduced, so that the inside of the heat storage tank 1 can be effectively used for heat storage and heat dissipation.

FIGS. 4 (a) and 4 (b) are perspective views showing a first modified example of the inflow / outflow devices 23 and 24 seen from diagonally above and diagonally below, respectively. In the inflow / outflow devices 25 and 26 shown in FIGS. 4A and 4B, two header rings 214 and 215 having different diameters are arranged concentrically. Then, the pipes 31 and 32 of the slurry circulation circuit 3 are branched in two directions and connected to the header rings 214 and 215, respectively. The microcapsule slurries branched by the pipes 31 and 32 are respectively fed to the respective header rings 214,
It is guided to 215 and flows out from each hole 213.

At this time, the outer and inner header rings 21
A part of the slurry flowed out from 4, 215 rises or falls from between the header rings 214, 215. As a result, it is possible to reduce the disturbance of the stratified portion due to the outflow from the header rings 214 and 215, and to obtain uniform temperature stratification. Further, since dead water areas between the ceiling mirror plate 21 and the upper inflow / outflow device 25 and between the bottom mirror plate 22 and the lower inflow / outflow device 26 are further reduced, heat storage and heat dissipation in the heat storage tank 1 are performed. It can be used effectively. Note that three or more header rings may be concentrically formed.

FIG. 5 is a structural diagram of a heat storage tank showing a second modified example of the inflow / outflow devices 23 and 24. In the inflow and outflow device shown in FIG. 5, two header rings 231 and 231 are provided, respectively.
And 232 and 232 are arranged side by side in the cylindrical cross section direction of the heat storage tank 1. Each header ring is arranged so as to face the ceiling mirror plate 21 or the bottom mirror plate 22, and the pipes 31 and 32 of the slurry circulation circuit 3 are branched into two and connected to the header rings 231 and 231 and 232 and 232, respectively. ing. Note that three or more heading rings may be arranged side by side.

Even in this case, a uniform velocity distribution can be obtained in the height direction with respect to the ascending or descending velocity of the microcapsule slurry, so that a uniform temperature stratification can be obtained in the heat storage tank 1, and the ceiling mirror plate 21 and Since the dead water area between the upper inflow / outflow device and between the bottom end plate 22 and the lower outflow / inflow device is reduced, the heat storage tank 1 can be effectively used for heat storage and heat dissipation.

(Second Embodiment) FIG. 6 is a side sectional view showing the structure of a heat storage tank according to a second embodiment of the present invention. The heat storage tank of the second embodiment is used instead of the heat storage tank 1 in the heat storage system shown in FIG.

A heat storage tank 1'shown in FIG. 6 has a cylindrical shape, and an upper part thereof is a ceiling plate 41 and a lower part is a bottom plate 4.
It consists of two. The inner side surface of the heat storage tank 1 and the ceiling flat plate 41 and the bottom flat plate 42 are substantially orthogonal to each other. An inflow / outflow device (swirl flow outflow / inflow device) is provided on each of the upper and lower inner side surfaces of the heat storage tank 1.
43 and 44 are provided so as to surround the heat storage tank 1.

FIG. 7 is a perspective view of the inflow / outflow devices 43 and 44. Each of the inflow / outflow devices 43 and 44 has an annular shape, and a plurality of nozzles 45 are provided at regular intervals on the inner surface thereof. Each nozzle 45 penetrates the inner surface of the heat storage tank 1 and projects into the heat storage tank 1, is parallel to the ceiling flat plate 41 or the bottom flat plate 42, and is fixed in the same direction with respect to the inner surface of the heat storage tank 1. It is arranged at an angle. In addition, each nozzle 45
May not be projected from the inner side surface of the heat storage tank 1, and the cross section of each nozzle 45 and the inner side surface may be flush with each other.

In the heat storage tank 1 having such a structure, during cold heat storage, the microcapsule slurry circulated in the slurry circulation circuit 3 is discharged from each nozzle 45 of the inflow / outflow port 44 to the bottom flat plate 42 in the heat storage tank 1. , And the slurry rises in the heat storage tank 1 while having a swirling flow. The microcapsule slurry that has risen in the heat storage tank 1 eventually flows out from each nozzle 45 of the inflow / outflow device 43 to the pipe 31 of the slurry circulation circuit 3 near the ceiling flat plate 41 by the suction force from the inflow / outflow device 43 side.

On the contrary, during cold heat radiation or hot heat storage, the microcapsule slurry is conversely placed in each nozzle 45 of the inflow / outflow port 43 above.
Flows parallel to the ceiling flat plate 41 in the heat storage tank 1,
The slurry descends in the heat storage tank 1 while having a swirling flow.
The microcapsule slurry that has descended in the heat storage tank 1 is eventually discharged from each nozzle 45 of the inflow / outflow device 44 to the pipe 32 of the slurry circulation circuit 3 near the bottom flat plate 42 by the suction force from the outflow / inflow device 44 side.

In this case, with respect to the rising or falling speed of the microcapsule slurry, a uniform velocity distribution in the height direction can be obtained, so that uniform temperature stratification can be obtained in the heat storage tank 1, and the vicinity of the ceiling plate 41 and Since the dead water area near the bottom flat plate 42 decreases, the inside of the heat storage tank 1 can be effectively used for heat storage and heat dissipation.

The heat storage tank is not limited to the microcapsule slurry as the heat storage medium, and water or other fluid can be applied.

(Third Embodiment) FIG. 8 is a diagram showing a structure of a heat storage tank and an expansion tank in the third embodiment. In the heat storage system of the third embodiment, an expansion tank 51 is provided separately from the heat storage tank 1 in the heat storage system shown in FIG. 1, and the top of the heat storage tank 1 and the expansion tank 5 are provided.
The bottom part of 1 is connected by a pipe 52. The expansion tank 51 is a closed type, and the inside of the expansion tank 51 is not exposed to the atmosphere. As described above, the heat storage tank 1
When the slurry in the heat storage tank 1 expands, the increased capacity of the slurry flows into the expansion tank 51 from the heat storage tank 1 through the pipe 52, and conversely, when the slurry in the heat storage tank 1 contracts, the decreased capacity Minute slurry is flowed into the heat storage tank 1 from the expansion tank 51 through the pipe 52.

Further, in the expansion tank 51, a coil-like pipe 53 is provided in the lower space for containing the slurry, and the return cold water (12 ° C.) is passed through this pipe 53. There is. Further, an inert gas such as nitrogen gas is supplied from the pipe 54 to the upper space where the slurry is not contained, and the slurry is pressurized by this inert gas.

The height of the bottom of the expansion tank 51 is set so that the slurry in the expansion tank 51 does not increase or decrease under atmospheric pressure and the slurry in the heat storage tank 1 does not cause liquid column separation. It is installed at a height of 10m or less from the top. By thus installing the expansion tank 51 so as to operate under atmospheric pressure, the cost of the tank can be reduced.

As described above, since the microcapsule slurry has a high expansion coefficient, when it is hermetically sealed in the heat storage tank, the pressure fluctuation becomes large, and it becomes necessary to keep the design pressure of the heat storage tank high.
It becomes uneconomical in terms of cost. However, in the third embodiment, by using the closed type expansion tank, it is possible to freely deal with the expansion and contraction of the slurry in the heat storage tank, and it is possible to economically carry out at a low cost. . Further, since the slurry is not exposed to the atmosphere, it is possible to prevent the occurrence of a film, the solidification phenomenon, and the deterioration of the slurry, and the slurry is always increased and decreased smoothly in the expansion tank.

Further, the film substance forming the microcapsule slurry is plastic, and chemical products such as plastics generally deteriorate with age as the temperature rises (deterioration occurs every 10 ° C. increase in temperature). The degree is about 2-3
However, in the third embodiment, it is possible to prevent deterioration of the slurry and improve heat storage efficiency by precooling the slurry in the expansion tank with return cold water. it can. Further, it is conceivable that the inflow and outflow of the slurry from the expansion tank becomes a thermal disturbance element to the heat storage tank. However, by performing the precooling with the return cold water described above, this type of disturbance can be prevented.

(Fourth Embodiment) FIG. 9A,
(B) is a figure showing the composition of the expansion tank in a 4th embodiment of the present invention. The expansion tank according to the fourth embodiment is the same as the expansion tank 51 shown in the third embodiment in the heat storage system shown in FIG.
It is used for the purpose of enhancing the hermeticity of the slurry. With the method of sealing with an inert gas such as nitrogen gas as in the third embodiment, the slurry is not exposed to the atmosphere, but the evaporation of water in the slurry cannot be suppressed. It is also possible to separate in the oil layer, but the specific gravity of the slurry itself is about 0.9, and a light oil with a specific gravity smaller than this is required, and the flammability of the light oil becomes a problem. Therefore,
The fourth embodiment has the following configuration. Figure 9
As shown in (a) and (b) of FIG.
A diaphragm diaphragm 63 is provided on the side surface of the casing 62.
Is installed, and the top of the heat storage tank 1 and the bottom of the expansion tank 61 are connected to each other by a pipe 64 penetrating the casing 62.

As described above, when the slurry in the heat storage tank 1 expands, the increased capacity of the slurry is stored in the heat storage tank 1.
From the diaphragm 6 of the expansion tank 61 via the pipe 64
Guided within 3. At this time, the diaphragm 63 swells upward as the amount of slurry in the diaphragm 63 increases, as shown in FIG. 9A. On the contrary, when the slurry in the heat storage tank 1 contracts, the reduced capacity of the slurry is introduced from the inside of the diaphragm 63 of the expansion tank 61 into the heat storage tank 1 through the pipe 64. At this time the diaphragm 63
As shown in (b) of FIG. 9, the toner shrinks downward as the amount of the slurry therein decreases.

Further, pipes 65 and 66 are provided above and below the casing 62, and the return cold water (12
(° C.) is supplied from the lower pipe 66, rises in the casing 62, and is sucked into the upper pipe 65. As a result, the casing 62 and the diaphragm 63
Cold water 67 is stored in the space formed by. In addition, piping 6
5 and 66 are provided at a height such that the cold water 67 can be stored so that the entire diaphragm 63 is immersed in the cold water 67 even when the diaphragm 63 is in the most expanded state. Also,
Although the top of the casing 62 is open, the slurry 11 is not exposed to the atmosphere due to the diaphragm 63, and the slurry 11 is in a sealed state.

FIGS. 10A and 10B show the fourth embodiment of the present invention.
It is a figure which shows the structure of the expansion tank of the bellows system which is the 1st modification of the expansion tank in embodiment of this invention. As shown in FIGS. 11A and 11B, in the expansion tank 71, a bellows type canvas bellows 7 is provided on the bottom surface inside the casing 72.
3 is installed, and the top of the heat storage tank 1 and the bottom of the canvas bellows 73 are connected to each other by a pipe 74 penetrating the casing 72.

In the same manner as described above, when the slurry in the heat storage tank 1 expands, the increased capacity of the slurry is stored in the heat storage tank 1.
Is introduced into the canvas bellows 73 of the expansion tank 71 through the pipe 74. Canvas bellows 73 at this time
As shown in FIG. 10A, the slurry expands upward as the amount of slurry in the slurry increases. On the contrary, when the slurry in the heat storage tank 1 contracts, the reduced amount of slurry is introduced into the heat storage tank 1 from the canvas bellows 73 of the expansion tank 71 through the pipe 74. At this time, the canvas bellows 73, as shown in FIG.
As the slurry inside it decreases, it contracts downward.

Further, pipes 75 and 76 are provided above and below the casing 72, and the return cold water (12
(° C.) is supplied from the lower pipe 76, rises in the casing 72, and is sucked into the upper pipe 75. As a result, the cold water 77 is stored in the space formed by the casing 72 and the canvas bellows 73. It should be noted that the pipes 75 and 76 are such that even when the canvas bellows 73 is in the most extended state, the entire canvas bellows 73 is cold water 77.
It is installed at a height where cold water 77 can be stored so as to be immersed therein. Also, although the top of the casing 72 is open,
The canvas bellows 73 is not exposed to the atmosphere due to the presence of the cold water 77, and the inside of the canvas bellows 73 is in a sealed state.

FIGS. 11A and 11B are views showing the structure of a sleeve type expansion tank which is a second modification of the expansion tank according to the fourth embodiment. As shown in (a) and (b) of FIG. 11, in the expansion tank 81, a cylinder 83 is installed on the bottom surface inside the casing 82, and the top of the heat storage tank 1 and the bottom of the cylinder 83 are connected to the pipe 8
4 is connected through the casing 82. In the cylinder 83, the piston 85 moves up and down, and the cylinder 83 and the piston 85 are always in close contact with each other.

In the same manner as described above, when the slurry in the heat storage tank 1 expands, the increased capacity of the slurry is stored in the heat storage tank 1.
From the cylinder 82 of the expansion tank 81 via the pipe 84
Be guided inside. At this time, the piston 83 inserted in the cylinder 82 moves upward as the slurry in the piston 83 increases as shown in FIG. On the contrary, when the slurry in the heat storage tank 1 contracts, the reduced capacity of the slurry is applied to the cylinder 83 of the expansion tank 81.
It is guided from the inside into the heat storage tank 1 through the pipe 84. At this time, as shown in FIG. 11B, the piston 85 moves downward as the amount of slurry in the piston 85 decreases.

Further, pipes 86 and 87 are provided above and below the casing 82, and the return cold water (12
C) is supplied from the lower pipe 87, rises in the casing 82, and is sucked into the upper pipe 86. As a result, cold water 88 is stored in the gap formed by the casing 82 and the cylinder 83. Note that the pipe 8
6, 87 are provided at a height where cold water 88 can be stored so that the entire cylinder 83 is always immersed in the cold water 88.
Although the top of the casing 82 is open, the cylinder 83 is not exposed to the atmosphere due to the presence of the cold water 88, and the inside of the cylinder 83 is sealed.

As described above, the microcapsule slurry has a high expansion coefficient and has a volume expansion coefficient of 30 times that of water. In the fourth embodiment, by using a closed expansion tank of diaphragm type, bellows type or sleeve type,
Unlike the expansion tank of the pressurization system using an inert gas described in the embodiment, the pressure generated by the expansion of the slurry in the expansion tank can be released to the atmosphere, and the pressure fluctuation range can be reduced. Therefore, the volumetric absorption amount is larger than that of the pressurization type expansion tank, and it is possible to cope with the larger expansion and contraction of the slurry. In addition, since the slurry is not exposed to the atmosphere, it is possible to prevent the occurrence of a film, the solidification phenomenon, and the deterioration of the slurry, and the slurry is always increased and decreased smoothly in the expansion tank.

Further, although the microcapsule slurry has a property that the deterioration over time becomes more remarkable as the temperature rises, in the fourth embodiment, the diaphragm 63, the canvas bellows 73 or the cylinder 83 is dipped in the return cold water to form the diaphragm. By pre-cooling the slurry in 63, the canvas bellows 73 or the cylinder 83, deterioration of the slurry can be prevented and heat storage and heat dissipation efficiency can be improved.

(Fifth Embodiment) In the fifth embodiment of the present invention, the pressurization type expansion tank shown in the third embodiment and the diaphragm shown in the fourth embodiment. method,
It is connected to an expansion tank of a bellows type or a sleeve type and is used by being installed in the heat storage system shown in FIG.

That is, in the fifth embodiment, the top of the heat storage tank 1 and the bottom of the expansion tank 51 are connected by the pipe 52, and the bottom of the expansion tank 51 is connected by the pipe 64.
(Or 74, 84) is connected to the diaphragm 63 (or canvas bellows 73, cylinder 83) via a valve (not shown).

With such a configuration, when the expansion and contraction amount of the microcapsule slurry in the heat storage tank 1 is relatively small, the valve is closed and only the expansion tank 51 of the pressurizing type is used to expand and contract the slurry. When the valve is large, the expansion valve 51 of the pressurizing type and the expansion tank 61 (or 71, 81) of the diaphragm type (or bellows type, sleeve type) can be used together. With this, when a large volume absorption amount is not required, it is not necessary to operate the expansion tank of the diaphragm type, the bellows type, or the sleeve type, which has a large operating force, so that each expansion tank can be efficiently used.

(Sixth Embodiment) FIG. 12 is a diagram showing a structure of a heat storage tank and an expansion tank in the sixth embodiment. In the heat storage system of the sixth embodiment, an expansion tank 91 is provided integrally with the heat storage tank 1 in the heat storage system shown in FIG. 1, and the top of the heat storage tank 1 and the bottom of the expansion tank 91 are bulkhead end plates. It is partitioned by 92. This expansion tank 91 has a diaphragm diaphragm 9 on its side surface.
3 is installed, the top of the heat storage tank 1 and the expansion tank 91.
The bottom part of is connected by a communication pipe 94.

In the same manner as described above, when the slurry in the heat storage tank 1 expands, the increased amount of the slurry is stored in the heat storage tank 1.
When the slurry in the heat storage tank 1 contracts from the heat storage tank 1 to the expansion tank 91 through the communication pipe 94,
The reduced volume of slurry is sent from the expansion tank 91 to the pipe 9
It is introduced into the heat storage tank 1 via 4.

Further, the bottom of the expansion tank 91 is in contact with the top of the heat storage tank 1 through the partition wall plate 92, and the slurry in the expansion tank is separated by the partition wall plate 9 from the slurry in the heat storage tank.
It is cooled by heat transfer via 2. Also, the expansion tank 9
Although the top of No. 1 is open, the slurry 11 is not exposed to the atmosphere due to the diaphragm 93 being interposed, and the slurry 11 is in a sealed state.

Since the top of the expansion tank 91 is open, the increase and decrease of the slurry occur under atmospheric pressure.
Further, the heat storage tank 1 may have a pressure resistance strength including a liquid column head from the top of the heat storage tank to the slurry liquid level of the expansion tank. Further, the top portion of the expansion tank can have a low cost structure such as a cone roof type with low pressure resistance. By thus installing the expansion tank 91 on the top of the heat storage tank 1 and operating under atmospheric pressure, it is possible to reduce the costs for the expansion tank and the heat storage tank. In addition, by covering the slurry 11 in the expansion tank 91 with the diaphragm 93,
The tightness of the slurry can be secured.

When the heat storage tank is separately installed as described above, it is necessary to increase the design pressure of the heat storage tank, which is uneconomical in terms of cost. However, in the sixth embodiment, by using the expansion tank integrated with the heat storage tank, it is possible to freely deal with the expansion and contraction of the slurry in the heat storage tank, and it is economically implemented at a low cost. be able to. In addition, since the slurry is not exposed to the atmosphere, it is possible to prevent the occurrence of a film, the solidification phenomenon, and the deterioration of the slurry, and the slurry is always increased and decreased smoothly in the expansion tank.

Further, the microcapsule slurry has a property that the deterioration over time becomes more remarkable as the temperature rises (the degree of deterioration of the film material increases about 2.5 times every 10 ° C. rise in temperature). In the embodiment, by cooling the slurry in the expansion tank with the slurry in the heat storage tank, deterioration of the slurry can be prevented and heat storage efficiency can be improved. Further, it is considered that the inflow and outflow of the slurry from the expansion tank becomes a thermal disturbance element to the heat storage tank, but by performing the above-described return cooling, this kind of disturbance can be prevented.

(Seventh Embodiment) FIG. 13 is a diagram showing the structure of the slurry circulation circuit in the heat storage system according to the seventh embodiment. 13, the same parts as those in FIG. 1 are designated by the same reference numerals. Each of the pipes 31 and 32 provided above and below the heat storage tank 1 has an electric valve 101,
102 is provided, and one electric valve 103 is provided between the pipes 31 and 32 on the upstream side of the electric valves 101 and 102.
The bypass pipe 104 provided with is connected. Pipes 31 and 32 on the upstream side of the bypass pipe 104 are provided with temperature sensors 105 and 106, respectively. Each temperature sensor 105, 106 and each electric valve 101, 10
2, 103 are connected to the control unit 107.

The operation of this heat storage system will be described below.
First, heat storage (or heat dissipation) is started after the heat storage system has been stopped for several days in the summer. At this time, the electric valves 101, 10 are controlled by the control unit 107.
2 is closed and the electric valve 103 is opened. Then, when the slurry pump 6 operates, the slurry in the pipe of the slurry circulation circuit 3 starts to circulate. At this time, the slurry circulates in a bypass circuit including the heat exchanger 2, the slurry pump 6, the pipe 32, the bypass pipe 104, and the pipe 31. At this point, the slurries in the respective pipes are at about room temperature (about ambient temperature), but the heat is exchanged by the heat exchanger 2 so that the temperature gradually decreases.

The temperature sensor 106 detects the temperature of the slurry flowing in the pipe 32, and when it detects that the temperature has reached 4.25 ° C., it sends a detection signal to the controller 107. When the control unit 107 receives the detection signal, it closes the electric valve 103, and the electric valve 101, 10
Open two. As a result, the slurry circulates in the regular slurry circulation circuit, that is, in the paths of the heat exchanger 2, the slurry pump 6, the pipe 32, the heat storage tank 1, and the pipe 31.

As described above, when the temperature of the microcapsule slurry is high at the start of heat storage and heat radiation in summer,
The temperature of the slurry in the pipe is higher than a predetermined temperature of the slurry flowing in the pipe when heat storage and heat dissipation are performed. Therefore, when heat storage and heat dissipation are started in this state, the slurry having a temperature higher than the predetermined temperature is stored in the heat storage tank 1 before the temperature of the slurry in the pipe falls to the predetermined temperature.
As a result, the heat storage and heat dissipation efficiency are reduced.

In this heat storage system, however, at the start of heat storage and heat dissipation, that is, in standby, the slurry is circulated through the bypass pipe 104 without flowing into the heat storage tank 1 until the temperature of the slurry in the pipe falls to the predetermined temperature. Let
As a result, the slurry in the pipe is cooled down to a predetermined temperature for normal heat storage and heat dissipation. Therefore,
After that, the slurry is caused to flow into the heat storage tank 1 and circulates through the regular slurry circulation circuit, so that stable heat storage and heat dissipation are performed from the start of heat dissipation and heat dissipation, and heat storage and heat dissipation efficiency is improved.

Further, as described above, instead of performing the control of closing the bypass circuit by detecting the temperature of the slurry by the temperature sensor, the temperature of the slurry in the bypass circuit is lowered by the timer (not shown) in the control unit 107. The bypass circuit may be controlled to be closed after the time is measured and the predetermined time is reached.

Thus, when the temperature of the slurry in the pipe is not strictly required, the timer can be used to start heat storage and heat dissipation after an appropriate time has elapsed.

(Eighth Embodiment) FIG. 14 is a diagram showing the structure of an oil content measuring unit according to the eighth embodiment.
This oil content measuring unit is installed in the heat storage tank 1 in the heat storage system shown in FIG. The paraffin flowing out from the collapsed microcapsules has a characteristic that the specific gravity is smaller than that of water, so that it rises due to buoyancy separation and is unevenly distributed in the upper part of the heat storage tank 1. A connecting pipe 11 is provided on the top of the heat storage tank 1.
The lower end of the sampling pot 112 is connected to the upper end of the connecting pipe 111. The middle portion of the connecting pipe 111 is connected to the top of the expansion tank 114 located below the connecting pipe 111 via the pipe 113, and the upper portion of the expansion tank 114 is located below the expansion tank 114 via the pipe 115. It is connected to the sampler 116 located. Further, the sampling pot 112 is connected to the sampler 116 via a pipe 117.

When the microcapsule slurry in the heat storage tank 1 expands, the slurry above the heat storage tank 1 flows into the expansion tank 114 via the connecting pipe 111 and the pipe 113. When the microcapsule slurry in the heat storage tank 1 contracts,
The slurry in the expansion tank 114 is connected to the pipe 113 and the connecting pipe 1.
It flows into the heat storage tank 1 via 11.

A connecting pipe 11 connecting the heat storage tank 1 and the expansion tank 114 when such expansion and contraction of the slurry occurs.
The slurry is flowed into the sampling pot 112 provided above 1. The microcapsule slurry containing a large amount of paraffin unevenly distributed in the upper part of the heat storage tank 1 expands and contracts every time the sampling pot 112 and the expansion tank 11
4 and the heat storage tank 1 are moved. Here, although the valve 124 is normally closed in the sampling pot 112,
At the time of expansion, the level sensor 121 detects the presence of the microcapsule slurry, opens the valve 124, and opens the sampler 11.
Move the microcapsule slurry to 6. The oil content in the microcapsule slurry containing a large amount of paraffin is measured to control the oil content of the microcapsule slurry in this heat storage system.

As a result of this measurement, when the oil content per 1 liter of the slurry collected in the sampler 116 is the specified value or more, the same amount of normal slurry as the amount collected in the sampler 116 is applied to the bottom of the heat storage tank 1. Piping 11 provided
Replenish from 8 in the heat storage tank 1. If the oil content is less than the specified value per liter of slurry, the slurry collected in the sampler 116 is extracted by a tank truck (not shown) and injected into the heat storage tank 1 through the pipe 118.

Similarly, the valve 123 is normally closed in the expansion tank 114. Level sensor 1 when inflated
The presence of microcapsule slurry is sensed at 22 and valve 1
Open 23 and move the microcapsule slurry to the sampler 116. The oil content in the microcapsule slurry containing a large amount of paraffin is measured to control the oil content of the microcapsule slurry in this heat storage system. The sample can also be extracted from both the sampling pot 112 and the expansion tank 114.

The oil content of the microcapsule slurry as described above is measured about once a year, and when the oil content exceeds the allowable amount, the slurry is replaced with a normal slurry to improve the aged efficiency of the heat exchanger. It is possible to prevent the deterioration of the temperature and maintain a predetermined performance.

The present invention is not limited to the above-mentioned respective embodiments, and can be modified and implemented as appropriate without departing from the scope of the invention.

[0108]

According to the heat storage system of claim 1 of the present invention, a uniform velocity distribution can be obtained in the height direction with respect to the ascending or descending velocity of the slurry. Since stratification is obtained and the dead water area between the ceiling plate and the upper inflow and outflow device and between the bottom plate and the lower inflow and outflow device is reduced, the heat storage tank is effectively used for heat storage and heat dissipation. be able to.

According to the heat storage tank of the second aspect of the present invention, a uniform velocity distribution can be obtained in the height direction with respect to the rising or falling speed of the slurry, so that uniform temperature stratification can be achieved in the heat storage tank. Since the dead water area between the ceiling plate and the upper header ring and between the bottom plate and the lower header ring is reduced, the inside of the heat storage tank can be effectively used for heat storage and heat dissipation.

According to the heat storage tank of the third aspect of the present invention, it is possible to reduce the disturbance of the stratified portion due to the outflow from the header ring, and obtain a uniform temperature stratification. Further, the dead water area between the ceiling plate and the upper header ring and between the bottom plate and the lower header ring is further reduced.

According to the heat storage tank of claim 4 of the present invention, a uniform velocity distribution can be obtained in the height direction with respect to the ascending or descending speed of the slurry, so that uniform temperature stratification can be achieved in the heat storage tank. Since the dead water area between the ceiling plate and the upper and lower inflow / outflow devices and between the bottom plate and the lower inflow / outflow device is reduced, it is possible to effectively use the heat storage tank for heat storage and heat dissipation. it can.

According to the heat storage system of claim 5 of the present invention, a uniform velocity distribution can be obtained in the height direction with respect to the rising or falling velocity of the slurry, so that uniform temperature stratification is achieved in the heat storage tank. Since it is obtained and the dead water area near the ceiling plate and the bottom plate is reduced, the inside of the heat storage tank can be effectively used for heat storage and heat dissipation.

According to the heat storage tank of claim 6 of the present invention, a uniform velocity distribution can be obtained in the height direction with respect to the ascending or descending speed of the slurry, so that uniform temperature stratification can be achieved in the heat storage tank. Since it is obtained and the dead water area near the ceiling plate and the bottom plate is reduced, the inside of the heat storage tank can be effectively used for heat storage and heat dissipation.

According to the heat storage system of claim 7 of the present invention, by using the closed type auxiliary tank, it is possible to freely cope with expansion and contraction of the slurry in the heat storage tank, and it is economical at a low cost. Can be carried out in a specific manner. Further, since the slurry is not exposed to the atmosphere, it is possible to prevent the generation of a microcapsule agglomerate film, the solidification phenomenon, and the deterioration of the slurry, and the slurry is constantly increased and decreased in the expansion tank.

According to the heat storage system of claim 8 of the present invention, the increase and decrease of the slurry in the auxiliary tank occur under atmospheric pressure, and the slurry in the heat storage tank does not cause liquid column separation. At the same time, the heat storage tank design pressure can be lowered, and the cost can be significantly reduced. According to the heat storage system of claim 9 of the present invention, by precooling the slurry in the auxiliary tank with the return water, deterioration of the slurry can be prevented and heat storage and heat dissipation efficiency can be improved. . Further, it is possible to prevent thermal disturbance to the heat storage tank due to the inflow and outflow of the slurry from the auxiliary tank.

According to the heat storage system of the tenth aspect of the present invention, the pressure generated by the expansion of the slurry in the auxiliary tank can be released to the atmosphere, and the pressure fluctuation range can be reduced. Therefore, the volumetric absorption amount becomes large, and it is possible to cope with the larger expansion and contraction of the slurry. Further, since the slurry is not exposed to the atmosphere, it is possible to prevent the occurrence of a microcapsule aggregation film, the solidification phenomenon, and the deterioration of the slurry,
The slurry is constantly increased and decreased in the auxiliary tank.

According to the heat storage system of the eleventh aspect of the present invention, by precooling the slurry in the diaphragm member by the return water, deterioration of the slurry is prevented and heat storage,
The heat dissipation efficiency can be improved.

According to the twelfth aspect of the present invention, the pressure generated by the expansion of the slurry in the auxiliary vessel can be released to the atmosphere, and the pressure fluctuation range can be reduced. Therefore, the volumetric absorption amount becomes large, and it is possible to freely cope with larger expansion and contraction of the slurry. Further, since the slurry is not exposed to the air, it is possible to prevent the generation of a microcapsule agglomeration film, the solidification phenomenon, and the deterioration of the slurry, and the slurry can be constantly increased and decreased in the auxiliary tank.

According to the heat storage system of the thirteenth aspect of the present invention, by installing the auxiliary tank integrally on the upper part of the heat storage tank, the design pressure of the heat storage tank and the auxiliary tank can be lowered, and the The cost can be reduced. Also,
Since the slurry is not exposed to the atmosphere by the diaphragm member installed in the auxiliary tank, deterioration of the microcapsule slurry can be prevented, and the slurry can be constantly increased and decreased in the auxiliary tank. Further, since the slurry is cooled via the partition wall end plate of the heat storage tank, deterioration of the slurry can be prevented and heat storage and heat radiation efficiency can be improved.

According to the stratified temperature type heat storage tank of the fourteenth aspect of the present invention, in the stratified temperature type heat storage tank using a fluid as a heat storage material, the auxiliary tank is integrally installed on the upper portion of the heat storage tank to store heat. The design pressure of the tank and the auxiliary tank can be lowered, and the cost can be significantly reduced. In addition, there is no need to install an auxiliary tank in addition to the heat storage tank,
It can save space.

According to the fifteenth aspect of the heat storage system of the present invention, the slurry in the circulation circuit is cooled down or heated up to a predetermined temperature at which normal heat storage and heat radiation are performed, and from the start of heat storage and heat radiation. Stable heat storage and heat dissipation are performed, and heat storage and heat dissipation efficiency is improved.

According to the sixteenth aspect of the heat storage system of the present invention, the slurry in the pipe is cooled down or heated up to a predetermined temperature for normal heat storage and heat radiation, and then the slurry is placed in the heat storage tank. By allowing the heat to flow and circulating through the regular circulation circuit, stable heat storage and heat dissipation are performed from the start of heat storage and heat dissipation, and heat storage and heat dissipation efficiency is improved.

According to the heat storage system of claim 17 of the present invention, the oil content in the slurry can be measured,
It can be used for sound maintenance management.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a heat storage system according to each embodiment of the present invention.

FIG. 2 is a side sectional view showing the configuration of the heat storage tank according to the first embodiment of the present invention.

FIG. 3 is a perspective view of the inflow / outflow device according to the first embodiment of the present invention.

FIG. 4 is a perspective view showing a first modified example of the inflow / outflow device according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a second modification of the inflow / outflow device according to the first embodiment of the invention.

FIG. 6 is a side sectional view showing a configuration of a heat storage tank according to a second embodiment of the present invention.

FIG. 7 is a perspective view of an inflow / outflow device according to a second embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of a heat storage tank and an expansion tank according to a third embodiment of the present invention.

FIG. 9 is a diagram showing a configuration of an expansion tank according to a fourth embodiment of the present invention.

FIG. 10 is a diagram showing a first modification of the expansion tank according to the fourth embodiment of the present invention.

FIG. 11 is a diagram showing a second modification of the expansion tank according to the fourth embodiment of the present invention.

FIG. 12 is a diagram showing a configuration of a heat storage tank and an expansion tank according to a sixth embodiment of the present invention.

FIG. 13 is a diagram showing a configuration of a slurry circulation circuit in a heat storage system according to a seventh embodiment of the present invention.

FIG. 14 is a diagram showing a configuration of an oil content measuring unit according to an eighth embodiment of the present invention.

FIG. 15 is a side sectional view showing the structure of a stratified temperature type heat storage tank applied to the heat storage system according to the first conventional example.

FIG. 16 is a diagram showing a configuration of a heat storage tank and an expansion tank applied to the heat storage system according to the second conventional example.

FIG. 17 is a diagram showing a configuration of a slurry circulation circuit in a heat storage system according to a third conventional example.

[Explanation of symbols]

1 ... Heat storage tank 1 '... Heat storage tank 11 ... Microcapsule slurry 2 ... Heat exchanger 3 ... Slurry circulation circuit 4 ... Cold water circulation circuit 5 ... Refrigerator 51 ... Evaporator 52 ... Compressor 53 ... Condenser 6 ... Slurry pump 7 ... Chilled water pump 8 ... Cold water pump 9 ... Cooling tower 21 ... Ceiling mirror plate 22 ... Bottom mirror plate 23,24,25,26 ... Inflow / outflow device (reverse flow outflow / inflow device) 211,214,215,231,232 ... Header ring 213 ... Holes 31, 32 ... Piping 41 ... Ceiling flat plate 42 ... Bottom flat plate 43, 44 ... Outflow / inflow device (swirl flow outflow / inflow device) 45 ... Nozzle 51 ... Expansion tank 52 ... Piping 53 ... Piping 61 ... Expansion tank 62 ... Casing 63 ... diaphragm 64 ... piping 65, 66 ... piping 67 ... cold water 71 ... expansion tank 72 ... casing 73 ... canvas bellows 74 ... piping 75, 76 ... piping 77 ... cold water 81 ... expansion tank 82 ... ke Housing 83 ... Cylinder 84 ... Piping 85 ... Piston 86, 87 ... Piping 88 ... Cold water 91 ... Expansion tank 92 ... Partition end plate 93 ... Diaphragm 94 ... Piping 101, 102, 103 ... Electric valve 104 ... Bypass piping 105, 106 ... Temperature sensor 107 ... Control part 111 ... Connection pipe 112 ... Sampling pot 113, 117, 118 ... Piping 114 ... Expansion tank 115 ... Piping 116 ... Sampler

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadashi Tsukano, Shinji Kandai, the root of the tree, Narita City, Chiba Prefecture, New Tokyo International Airport Authority Inside the Airport Public Corporation (72) Inventor Toshio Tashiro 24 Kamidai, the root of the tree, Narita City, Chiba Prefecture, New Tokyo International Airport Public Corporation (72) Inside Takahisa Yokose, 24 Shinji, the root of the Tree, Narita City, Chiba New Tokyo International Airport Public Corporation ( 72) Inventor Seiji Shibuya 2-1-1 Niihama, Arai-cho, Takasago-shi, Hyogo Mitsubishi Heavy Industries, Ltd. Takasago Plant (72) Inventor Shuji 2-1-1 Niihama, Arai-cho, Takasago, Hyogo Prefecture Takasago Works Mitsubishi Heavy Industries, Ltd. (72) Inventor Yoshinori Shirakata 2-1-1, Niihama, Arai-cho, Takasago, Hyogo Prefecture Takasago Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor, Yoichiro Iriya 2-1-1 Niihama, Arai-cho, Takasago-shi, Mitsubishi Heavy Industries, Ltd. Takasago Research Institute (72) Inventor Tadaaki Tanii 2-1-1, Niihama, Arai-cho, Takasago-shi, Hyogo (72) Inventor, Takasago Research Institute Enka Miyoshi 2-1-1, Niihama, Arai-cho, Takasago-shi, Hyogo Mitsubishi Heavy Industries Ltd. Takasago Research Laboratory (56) Reference JP 56-137098 (JP, A) JP 8-303976 (JP, A) Special Kaihei 9-145107 (JP, A) Actual opening Sho 59-134766 (JP, U) Actual opening Sho 61-23078 (JP, U) Special table 9-1051052 (JP, A) (58) Fields investigated ( Int.Cl. ⁷ , DB name) F28D 20/00

Claims (8)

(57) [Claims] 1. A heat storage system that uses, as a heat storage material, a slurry composed of minute capsules in which a core substance accompanied by phase change is enclosed and a liquid, and a heat storage tank for storing the slurry, and a slurry in the heat storage tank. According to the expansion and contraction of the heat storage tank, the auxiliary tank of the sealed type that flows in the slurry from the heat storage tank and the slurry flows out to the heat storage tank, and the circulation circuit for circulating the slurry in the heat storage tank, A heat exchanger for exchanging heat between the slurry circulated by a circuit and a heat utilization medium, wherein the slurry in the auxiliary tank is cooled by return water to the heat storage system. A heat storage system characterized by. 2. A heat storage system using, as a heat storage material, a slurry composed of a fine capsule in which a core substance accompanied by a phase change is enclosed and a liquid, in a heat storage tank for storing the slurry, and a slurry in the heat storage tank. According to the expansion and contraction of the heat storage tank, the sealed auxiliary tank for flowing the slurry out of the heat storage tank and the slurry outflow to the heat storage tank, and a circulation circuit for circulating the slurry in the heat storage tank, A heat exchanger for exchanging heat between the slurry and the heat utilization medium circulated by a circuit, wherein the auxiliary tank is a container, and a diaphragm member provided in the container. In the container, the diaphragm member is immersed so that the inside of the diaphragm member is sealed with a fluid, and the slurry is flowed from the heat storage tank according to the expansion and contraction of the slurry in the heat storage tank. Thermal storage system characterized by flowing a slurry to the storage tank while. 3. The heat storage system according to claim 2 , wherein the fluid is return water to the heat storage system. 4. A hermetically-sealed auxiliary tank for flowing the slurry from the heat storage tank and flowing the slurry to the heat storage tank according to expansion and contraction of the slurry in the heat storage tank, a container, and a container inside the container. An auxiliary tank comprising: a diaphragm member provided, wherein the diaphragm member is immersed in the container so that the inside of the diaphragm member is sealed by a fluid. 5. A heat storage system using, as a heat storage material, a slurry composed of microcapsules enclosing a core substance accompanied by a phase change and a liquid as a heat storage material, and a heat storage tank for storing the slurry, and a slurry in the heat storage tank. According to the expansion and contraction of the heat storage tank, the sealed auxiliary tank for flowing the slurry out of the heat storage tank and the slurry outflow to the heat storage tank, and a circulation circuit for circulating the slurry in the heat storage tank, A heat exchanger for exchanging heat between the slurry and the heat utilization medium circulated by a circuit, wherein the auxiliary tank is integrally installed on the upper part of the heat storage tank,
The container is provided with a diaphragm member, the slurry is sealed by the diaphragm member in the container, and the slurry flows from the heat storage tank according to expansion and contraction of the slurry in the heat storage tank. A heat storage system characterized by discharging slurry to a heat storage tank. 6. A heat storage system that uses, as a heat storage material, a slurry composed of minute capsules in which a core substance accompanied by a phase change is enclosed and a liquid, a heat storage tank for storing the slurry, the slurry and a heat utilization medium. A heat exchanger for heat exchange between the heat exchanger and the heat storage tank, and a slurry circulation circuit for circulating the slurry in the heat storage tank, and a slurry in the circulation circuit. A pump that circulates, a bypass circuit that heat-exchanges the slurry in the heat exchanger without causing the slurry to flow into the heat storage tank, and a slurry that circulates the slurry in the bypass circuit when heat storage starts or heat dissipation starts. And a control unit for circulating the slurry in the slurry circulation circuit and flowing into the heat storage tank after lowering or raising the temperature of the storage tank to a predetermined temperature. A heat storage system characterized by being equipped. 7. The bypass circuit is provided in each of the two pipes and a bypass pipe connected to the two pipes of the circulation circuit connected to the heat storage tank, and detects the temperature of the slurry in each pipe. Two temperature detecting means, at least one pair of first shutoff valves provided in the two pipes, and at least one second shutoff valve provided in the bypass pipe. Then, the control unit causes the slurry in the circulation circuit to flow into the bypass pipe by individually opening and closing the first shutoff valve and the second shutoff valve based on the detection result of the temperature detection means. After that, the heat storage system according to claim 6 , wherein the heat storage system is controlled to flow into the heat storage tank. 8. A heat storage system using, as a heat storage material, a slurry composed of a fine capsule in which a core substance accompanied by a phase change is enclosed and a liquid, in a heat storage tank for storing the slurry, and in the heat storage tank. A circulation circuit for circulating the slurry, a heat exchanger for exchanging heat between the slurry and the heat utilization medium circulated by the circulation circuit, and according to expansion and contraction of the slurry in the heat storage tank, A hermetically-sealed auxiliary tank that flows in the slurry from the heat storage tank and flows out to the heat storage tank, and a collection tank that is provided on the top of the heat storage tank and collects the slurry according to the action of the auxiliary tank, A heat storage system, comprising: an extractor for extracting the slurry contained in at least one of the collection tank and the auxiliary tank.