JP2000304480A - Thermal storage system, thermal storage tank, auxiliary tank, and stratified temperature type thermal storage tank - Google Patents

Abstract

(57) [Summary] To provide a heat storage system and a heat storage tank that can be effectively used for storing and radiating heat in a heat storage tank. In a heat storage system using a slurry composed of microcapsules and a liquid in which a core substance with a phase change is sealed and a liquid as a heat storage material, a heat storage tank for storing the slurry, and the heat storage tank. The slurry 11 in the
And a heat exchanger for exchanging heat between the slurry 11 and the heat utilization medium circulated by the circulation circuit. At least one set of inflow / outflow units having a plurality of holes provided in a substantially annular shape so as to face the ceiling plate (21) and the floor plate (22) of the tank 1 to flow out and flow the slurry 11 through each of the holes. 23 and 24 were provided.

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 applied to, for example, a heat storage facility for air conditioning, a heat storage facility for a district cooling / heating facility, a heat storage facility for an intake cooling device of a gas turbine power generation facility, and an industrial heat source facility. , 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 using only 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 the water is used. Are known. In this ice heat storage method, brine (antifreeze) cooled to 0 ° C. or less during heat storage
The water is cooled by using water to store cold heat as ice, and the heat is extracted by directly using cold water or indirectly melting the ice via brine during heat radiation.

In the heat storage system using the conventional ice latent heat method, when storing heat, it is necessary to cool the brine to about -5.degree. C. with a refrigerator, so that it is necessary to lower the refrigerant evaporation temperature of the refrigerator. The ratio of the amount of stored heat to the input of the refrigerator, that is, the coefficient of performance, is reduced. In addition, it is necessary to use brine when cooling ice, and care must be taken in its management.

As another example of a latent heat storage system, a latent heat storage material that changes phase at room temperature is utilized, and the latent heat storage material is encapsulated in a capsule or container as a core material to form cold water or water. Cooling as a solid by cooling using brine, or storing heat as a liquid by heating using warm water, and indirectly melting the cold heat by indirectly melting the latent heat storage material during heat radiation, taking out the heat by solidifying Methods are known. When using the latent heat storage material that changes phase at normal temperature, it is necessary to enclose the latent heat storage material in a capsule or container in terms of handling when the latent heat storage material has volatility or when used in a eutectic salt solution. .

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

[0006] In such a stationary capsule system and a container system, during heat storage and heat radiation, between these capsules or containers (hereinafter referred to as heat storage material containers) 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 of the latent heat storage material heated at the time of heat release or the temperature difference between the temperature of the latent heat storage material cooled at the time of heat storage and the temperature of the heat medium fluid used, such as water, must be about 5 ° C. or more in each state. The temperature of the heat transfer fluid used such as water during heat storage and heat release is 10
It is necessary to provide a temperature difference of at least ° C. That is, when trying to extract cold water of 5 ° C., it is necessary to cool with brine of −5 ° C. when storing heat. In addition, if it is attempted to store heat at a temperature level where brine is not used, the cold water discharge temperature will be 1
The temperature is 0 ° C. or higher, which is a temperature that cannot be directly used for general air conditioning and the like.

In order to solve the problem of the system using such a latent heat storage method, a microcapsule formed by encapsulating a latent heat storage material as a core material in a microcapsule is mixed with water to form a slurry to form a fluid. (Below,
This slurry is called a microcapsule slurry), and a system with improved heat transfer performance is known. In this system, at the time of heat storage, the microcapsule slurry is cooled by exchanging heat with cold water or brine by a heat exchanger to cool the latent heat storage material in the microcapsules. Further, at the time of heat radiation, the microcapsule slurry is similarly returned by a heat exchanger and heated by exchanging heat with cold water or brine, thereby extracting cold heat from the latent heat storage material in the microcapsules.

[0008] In such a microcapsule slurry system, the microcapsules themselves flow and exchange heat with the heat transfer fluid through the heat transfer surface, which is sufficiently higher than the above-mentioned stationary heat storage material container system. A heat transfer coefficient is obtained, and it becomes possible to obtain a heat storage / release 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 material.

[0009]

[Problem to be Solved by the Invention] (First Problem) FIG.
FIG. 2 is a side sectional view showing a configuration of a stratified temperature type heat storage tank applied to a heat storage system using a water heat storage method according to a first conventional example. In this heat storage tank 201, for example, during cold heat storage at night, hot water after heat radiation drawn up from the heat storage tank 201 via the upper inflow / outflow unit 202 is cooled in a heat exchanger (not shown), and flows out of the lower side. Heat storage tank 2 via vessel 203
01 is returned. By continuing this circulation, the inside of the heat storage tank 201 is replaced by hot water after the heat release and cold water, and the heat storage is completed.

The inflow / outflow units 202 and 203 provided at the upper and lower sides of the heat storage tank 201 shown in FIG. 15 are disk-shaped, and have a structure in which water 204 flows out and flows in from the side in the horizontal direction. To make the water 204,
01 flows radially in the direction of the section of the cylinder. That is,
Water flows in and out so as to be orthogonal to the stratification heating in the height direction in the heat storage tank 201, and therefore, in order to suppress the mixing, generally, a speed in the height direction is not given.

For this reason, 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 flows into the heat storage tank 211. Mixing occurs during ascent or descent, and uniform temperature stratification in the height direction cannot be obtained. Further, since the fluid does not flow above the inflow / outflow device 202 and below the outflow / inflow device 203, the fluid flows between the ceiling head plate 205 and the upper inflow / outflow device 202 and between the bottom head plate 206 and the lower inflow / outflow device 203. There is a problem that a dead water area is generated in between, and this area cannot be effectively used for heat storage and heat radiation.

(Second Problem) FIG. 16 is a diagram showing the configuration of a stratified temperature type heat storage tank and an expansion tank applied to a heat storage system using a water heat storage method according to a second conventional example. In this heat storage system, for example, during the cold heat storage at night, the heat storage tank 30
Fluid 302 sucked from 1 is a heat exchanger (not shown)
, And returned into 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.

In general, a fluid expands and contracts with a change in temperature and a change in phase. On the other hand, in the case of a closed type heat storage tank, in order to absorb expansion and contraction due to temperature change and phase change, the effect on economics is greater than in the case of a single water phase, and it is necessary to devise an expansion tank.

In the heat storage system shown in FIG.
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 a pipe 304.
Connected by In this system, the heat storage tank 30
When the fluid 302 in the storage tank 1 expands, the increased amount of fluid is guided from the upper part of the heat storage tank 301 into the expansion tank 303 via the pipe 304, and conversely, when the fluid 302 in the heat storage tank 301 contracts. Then, the reduced amount of fluid is guided from the expansion tank 303 into the heat storage tank 301 via the pipe 304.

In such a conventional expansion tank, the expansion tank needs to be installed at a position higher than the heat storage tank, and the installation position of the expansion tank becomes higher. Further, the heat storage tank also needs to enhance the pressure resistance of the liquid column head from the liquid level of the expansion tank to the top of the heat storage tank, and thus has a problem in economy.

When a microcapsule slurry formed by encapsulating a phase-change core material in a microcapsule is used as a heat storage material, the microcapsule slurry in the expansion tank is exposed to the atmosphere. As the microcapsule slurry becomes particularly high in concentration, when it is exposed to the atmosphere, moisture evaporates, and the microcapsules aggregate to form a thin film. For this reason,
The thin film covers the surface of the slurry in contact with the atmosphere and eventually solidifies, causing the slurry to block in the expansion tank. As a result, the expansion tank cannot cope with expansion and contraction of the slurry in the heat storage tank, and the slurry deteriorates.

(Third Problem) FIG. 17 is a diagram showing a configuration 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, during cold night heat storage in summer, the heat storage tank 401
Is cooled by exchanging heat with cold water in the heat exchanger 404 through the slurry circulation circuit 403, and cools when the latent heat storage material of each microcapsule slurry changes to a solid phase. Heat storage tank 401 through the slurry circulation circuit 403
It is returned inside. By continuing this circulation, the heat storage tank 401 is replaced with the microcapsule slurry in which the latent heat storage material of each microcapsule has changed to a solid phase, and the heat storage is completed.

At the time of heat release in the daytime, the slurry circulation circuit 403 is switched to supply each microcapsule whose latent heat storage material has changed to a 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 returned cold water (for example, 12 ° C.) and the microcapsule slurry from the load side, and the latent heat storage material of each microcapsule changes to the liquid phase. Give cold heat 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 material of each microcapsule has changed 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 has large heat.

Therefore, if the microcapsule slurry is at room temperature (approximately air temperature) at the start of heat storage and heat radiation, the temperature of the slurry in the pipe will be a predetermined value of the slurry flowing through the pipe during heat storage and heat radiation. It is higher than the temperature. Therefore, when heat storage and heat radiation are started in this state,
By the time the temperature of the slurry in the pipe falls 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 do not start promptly, which is a factor of reducing heat storage and heat radiation efficiency.

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

The core substance of paraffin encapsulated in microcapsules is expensive, and the useful life of microcapsules after encapsulation is about 25 years. Under these usage conditions,
The film constituting the microcapsule may be degraded by aging, expansion and contraction due to a phase change of the core substance, or friction with the inner wall of the pipe. When the capsule of the microcapsule disintegrates, the core material inside the capsule is released into the slurry. Since the liberated core material contains aliphatic hydrocarbons and the like as a main constituent material, if it adheres to the heat transfer surface of the heat exchanger, the heat exchange performance is reduced. Therefore, in the heat storage system using the microcapsule slurry, it is necessary to keep the oil content per liter of the slurry below the specified value in order not to lower 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 a heat storage tank, an auxiliary tank, and a stratified temperature type heat storage tank which are economical against large expansion and contraction of the slurry, and can freely cope with large expansion and contraction of the slurry, 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 radiation,
To provide a heat storage system capable of dissipating heat and improving heat storage and heat radiation efficiency.

(4) An object of the present invention is to provide a heat storage system capable of measuring oil content in a slurry and enabling sound maintenance management.

[0028]

Means for Solving the Problems In order to solve the above problems and achieve the object, a heat storage system, a heat storage tank, an auxiliary tank, and a stratified temperature type heat storage tank of the present invention are constituted as follows.

(1) The heat storage system of the present invention uses, as a heat storage material, a slurry composed of minute capsules in which a core material containing a latent heat storage material with a phase change as a main constituent material and a liquid are enclosed, and a liquid. , A heat storage tank for storing the slurry, a circulation circuit for circulating the slurry in the heat storage tank, and heat exchange for performing heat exchange between the slurry and a heat utilization medium circulated by the circulation circuit And a plurality of holes provided in the heat storage tank in a substantially annular shape so as to face the ceiling plate and the floor plate of the heat storage tank, and the slurry flows out and in through each of the holes. At least one set of inlet / outlet was provided.

(2) The heat storage tank of the present invention is a heat storage tank for storing a liquid or a slurry acting as a heat storage material, and a plurality of the heat storage tanks provided in a substantially annular shape so as to face the ceiling plate and the floor plate, respectively. And at least one set of inflow / outflow devices for flowing and inflowing the fluid or slurry through each of the holes.

(3) The heat storage tank of the present invention is the heat storage tank according to the above (2), and each of the outflow / inflow units is provided with a plurality of the header rings concentrically.

(4) The heat storage tank of the present invention is the heat storage tank described in (2) above, and each of the outflow / inflow units is provided with a plurality of the header rings.

(5) The heat storage system according to the present invention is a heat storage system using a slurry composed of a microcapsule in which a core substance mainly composed of a latent heat storage substance with a phase change is enclosed and a liquid as a heat storage material. A heat storage tank for storing the slurry, a circulation circuit for circulating the slurry in the heat storage tank, and a heat exchanger for exchanging heat between the slurry and a heat utilization medium circulated by the circulation circuit. The heat storage tank is provided so as to surround the heat storage tank in the vicinity of a ceiling flat plate and a floor flat plate, respectively, and the slurry flows out into the heat storage tank in a swirling flow form and the slurry from the heat storage tank. Was provided with a set of inflow / outflow devices having a plurality of holes for swirling.

(6) The heat storage tank of the present invention is a heat storage tank for storing a liquid or slurry acting as a heat storage material, and is provided near the ceiling flat plate and the floor flat plate of the tank so as to surround the heat storage tank. And a set of inflow / outflow devices having a plurality of nozzles for flowing the slurry into the heat storage tank in a swirling flow and for flowing the slurry from the heat storage tank in a swirling flow.

(7) The heat storage system of the present invention uses, as a heat storage material, a slurry composed of minute capsules in which a core material containing a latent heat storage material having a phase change as a main constituent material and a liquid and a liquid are contained. In, a heat storage tank for storing the slurry, expansion of the slurry in the heat storage tank,
In response to shrinkage, a closed auxiliary tank that flows in slurry from the heat storage tank and flows out of the slurry to the heat storage tank, a circulation circuit for circulating the slurry in the heat storage tank, and circulation by the circulation circuit A heat exchanger for exchanging heat between the slurry to be used and a heat utilization medium.

(8) The heat storage system of the present invention is the same as the above (7).
And the auxiliary tank is provided so as to be located within 10 m below the top of the heat storage tank.

(9) The heat storage system of the present invention is the same as the above (7).
Or the system according to (8), wherein the slurry in the auxiliary tank is cooled by return water to the heat storage system.

(10) The heat storage system according to the present invention is the system according to the above (7) or (8), wherein the auxiliary tank comprises 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 by a fluid, and in accordance with expansion and contraction of the slurry in the heat storage tank, the slurry flows from the heat storage tank and the slurry flows into the heat storage tank. leak.

(11) The heat storage system of the present invention has the above (1)
0) and the fluid is return water to the heat storage system.

(12) The auxiliary tank according to the present invention is a closed type auxiliary tank that flows in slurry from the heat storage tank and flows out slurry to the heat storage tank in accordance with expansion and contraction of the slurry in the heat storage tank. , A container, and a diaphragm member provided in the container, wherein the diaphragm member was immersed in the container so that the inside of the diaphragm member was sealed with a fluid.

(13) The heat storage system according to the present invention is the system according to the above (7), wherein the auxiliary tank is provided integrally with the heat storage tank, and is a diaphragm member provided in the container. In the container, the slurry is sealed by the diaphragm member, and the slurry flows in from the heat storage tank and flows out to the heat storage tank in accordance with expansion and contraction of the slurry in the heat storage tank.

(14) A stratified-temperature-type heat storage tank according to the present invention is a stratified-temperature-type heat storage tank using a fluid as a heat storage material, wherein the heat storage tank stores the fluid, and the fluid accumulates and contracts in the heat storage tank. And an auxiliary tank integrally provided on the upper part of the heat storage tank for flowing the fluid from the heat storage tank and flowing out the fluid to the heat storage tank.

(15) The heat storage system of the present invention uses, as a heat storage material, a slurry composed of minute capsules in which a core material containing a latent heat storage material having a phase change as a main constituent material and a liquid are enclosed, and a liquid. , A heat storage tank for storing the slurry, a circulation circuit for circulating the slurry in the heat storage tank, and heat exchange for performing heat exchange between the slurry and a heat utilization medium circulated by the circulation circuit And a means for causing the slurry in the circulation circuit to lower or raise the temperature to a predetermined temperature at the start of heat storage or heat radiation, and then to flow into the heat storage tank.

(16) The heat storage system of the present invention uses, as a heat storage material, a slurry composed of minute capsules in which a core substance containing a latent heat storage substance having a phase change as a main constituent substance and a liquid are sealed, and a liquid. , A heat storage tank for storing the slurry, a circulation circuit for circulating the slurry in the heat storage tank, and heat exchange for performing heat exchange between the slurry and a heat utilization medium circulated by the circulation circuit And a bypass pipe connected to two pipes of the circulation circuit connected to the heat storage tank, and two temperature detecting means provided in each of the two pipes and detecting a temperature of slurry in each pipe. At least one set of first shut-off valves provided on the two pipes, at least one second shut-off valve provided on the bypass pipe, and detection of the temperature detecting means. Control means for opening and closing the first shut-off valve and the second shut-off valve individually based on the result to flow the slurry in the circulation circuit through the bypass pipe and then into the heat storage tank. And with.

(17) The heat storage system of the present invention uses, as a heat storage material, a slurry composed of minute capsules in which a core material containing a latent heat storage material having a phase change as a main constituent material and a liquid are sealed, and a liquid. , A heat storage tank for storing the slurry, a circulation circuit for circulating the slurry in the heat storage tank, and heat exchange for performing heat exchange between the slurry and a heat utilization medium circulated by the circulation circuit Vessel, in accordance with the expansion and contraction of the slurry in the heat storage tank, a closed auxiliary tank that flows the slurry from the heat storage tank and flows out the slurry to the heat storage tank while being provided at the top of the heat storage tank, A collecting tank that collects the slurry with the action of the auxiliary tank, and an extractor that extracts slurry contained in at least one of the collecting tank and the auxiliary tank.

[0046]

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

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

Therefore, during heat storage and heat release, 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. The chilled water pump 7 or 8 is operated to supply chilled water to the heat exchanger 2 through the chilled water circulation circuit 4. Thereby, the microcapsule slurry 1 in the heat exchanger 2
Heat can be exchanged between 1 and cold water.

For example, during nighttime heat storage, the microcapsule slurry 11 sucked from the heat storage tank 1 is transferred to the heat exchanger 2.
Is cooled by exchanging heat with cold water, and stores the cold heat when the latent heat storage material of each microcapsule changes to a solid phase, and is returned to the heat storage tank 1. By continuing this circulation, the latent heat storage material of each microcapsule is replaced with the microcapsule slurry that has changed to a solid phase in the heat storage tank 1, and the heat storage is completed.

At the time of heat release 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 a solid phase to the heat exchanger 2. In the heat exchanger 2, the chilled water circulation circuit 4 is switched to exchange heat between the returned chilled water (12 ° C.) from the load side and the microcapsule slurry, and the cryogenic heat generated when the latent heat storage material of each microcapsule changes to the liquid phase. In cold water. This cold water is supplied to the load side as feed cold water (5 ° C.). The microcapsule slurry 11 in which the latent heat storage material of each microcapsule has changed phase is heated and returned to the heat storage tank 1.

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

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 its upper part is made up of a ceiling head plate 21 and its lower part is made up of a bottom head plate 22. Outflow / inflow devices (reversed flow outflow / inflow devices) 23 and 24 are provided above and below the heat storage tank 1, respectively. Note that the ceiling head plate 21 and the bottom head plate 22 each have a flat plate shape or a uniformly curved shape.

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

In the heat storage tank 1 having such a configuration, at the time of cold heat storage, the microcapsule slurry circulating in the slurry circulation circuit 3 is passed through the respective holes 213 of the lower inflow / outflow device 24 and the bottom head plate 22 in the heat storage tank 1 is discharged. In the direction, the flow is reversed by the bottom end plate 22, and rises from the outside and the inside of the header ring 211 of the inflow / outflow unit 24. The flow of the microcapsule slurry that has risen in the heat storage tank 1 is reversed near the ceiling end plate 21 due to the suction force from the inflow / outflow device 23, and from each hole of the inflow / outflow device 23 to the pipe 31 of the slurry circulation circuit 3. Will be leaked.

On the other hand, at the time of cooling / radiating heat, the microcapsule slurry flows in the direction of the ceiling head plate 21 in the heat storage tank 1 from each hole of the upper outlet / outlet unit 23, and the flow is reversed by the ceiling head plate 21, so that the slurry flows out. It descends from the outside and inside of the header ring 211 of the container 23. The flow of the microcapsule slurry that has descended in the heat storage tank 1 is reversed near the bottom end plate 22 due to the suction force from the inflow / outflow device 24, and from each hole of the inflow / outflow device 24 to the pipe 32 of the slurry circulation circuit 3. Will be leaked.

In this case, a uniform velocity distribution in the height direction can be obtained with respect to the ascending or descending speed of the microcapsule slurry, so that a uniform temperature stratification is obtained in the heat storage tank 1 and the ceiling head plate 21 and the upper Since the dead water area between the outflow / inflow device 23 and the bottom end plate 22 and the inflow / outflow device 24 in the lower portion is reduced, the inside of the heat storage tank 1 can be effectively used for heat storage and heat radiation.

FIGS. 4A and 4B are perspective views showing a first modification of the inflow / outflow units 23 and 24, respectively, as viewed from obliquely above and obliquely below. 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 respectively have header rings 214 and
215 and flows out of each hole 213.

At this time, the outer and inner header rings 21
A part of the slurry flowing out from the header rings 214 and 215 rises or falls from between the header rings 214 and 215. Thereby, disturbance of the stratified portion due to outflow from the header rings 214 and 215 can be reduced, and uniform temperature stratification can be obtained. Moreover, since the dead water area between the ceiling end plate 21 and the upper outflow / inflow unit 25 and between the bottom end plate 22 and the lower outflow / inflow unit 26 is further reduced, the inside of the heat storage tank 1 is used for heat storage and heat radiation. It can be used effectively. Note that three or more header rings may be configured concentrically.

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

Also in this case, a uniform velocity distribution in the height direction can be obtained with respect to the rising or lowering speed of the microcapsule slurry, so that a uniform temperature stratification can be obtained in the heat storage tank 1 and Since the dead water area between the upper outflow / inflow device and the bottom head plate 22 and the lower inflow / outflow device is reduced, the inside of the heat storage tank 1 can be effectively used for heat storage and heat radiation.

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

The heat storage tank 1 ′ shown in FIG. 6 has a cylindrical shape.
Consists of two. The inner side surface of the heat storage tank 1 is approximately perpendicular to the ceiling flat plate 41 and the bottom flat plate 42. An inflow / outflow device (a swirl flow outflow / inflow device) is provided on the upper and lower inner surfaces of the heat storage tank 1 respectively.
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. The inflow / outflow devices 43 and 44 have an annular shape, and a plurality of nozzles 45 are provided at regular intervals on the inner surface thereof. Each nozzle 45 penetrates through the inner surface of the heat storage tank 1 and protrudes into the heat storage tank 1, and is parallel to the ceiling flat plate 41 or the bottom flat plate 42, and each is fixed in the same direction with respect to the inner surface of the heat storage tank 1. They are arranged at an angle. 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 configured to be on the same plane.

In the heat storage tank 1 having such a configuration, at the time of cold heat storage, the microcapsule slurry circulating in the slurry circulation circuit 3 is supplied from the nozzles 45 of the lower inflow / outflow unit 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 is eventually discharged from the nozzles 45 of the inflow / outflow device 43 to the piping 31 of the slurry circulation circuit 3 near the ceiling flat plate 41 due to the suction force from the inflow / outflow device 43 side.

On the other hand, when radiating cold heat or storing heat, the microcapsule slurry is conversely discharged from each nozzle 45
Flows into the heat storage tank 1 in parallel to the ceiling flat plate 41,
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 unit 44 to the pipe 32 of the slurry circulation circuit 3 near the bottom plate 42 due to the suction force from the inflow / outflow unit 44 side.

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

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

(Third Embodiment) FIG. 8 is a diagram showing a configuration of a heat storage tank and an expansion tank according to the third embodiment. In the heat storage system according to 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.
1 are connected by a pipe 52. The expansion tank 51 is of 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 amount of slurry flows from the heat storage tank 1 into the expansion tank 51 via the pipe 52, and when the slurry in the heat storage tank 1 contracts, Of the slurry is flowed into the heat storage tank 1 from the expansion tank 51 via the pipe 52.

Further, in the expansion tank 51, a coiled pipe 53 is provided in a lower space in which the slurry is stored, and the return cold water (12 ° C.) is passed through the pipe 53. I have. An inert gas such as nitrogen gas is supplied from a pipe 54 to an upper space in which the slurry is not stored, and the slurry is pressurized by the inert gas.

The height of the bottom of the expansion tank 51 is adjusted so that the slurry in the expansion tank 51 increases or decreases under the atmospheric pressure and the slurry in the heat storage tank 1 does not cause liquid column separation. It is installed so that the height is less than 10m below the top. By installing the expansion tank 51 so as to operate under the atmospheric pressure, the cost for the tank can be reduced.

As described above, since the microcapsule slurry has a high expansion coefficient, the pressure fluctuation becomes large when the slurry is sealed in the heat storage tank, and it is necessary to increase the design pressure of the heat storage tank.
It becomes uneconomical in cost. However, in the third embodiment, by using a closed type expansion tank, it is possible to freely cope with expansion and contraction of the slurry in the heat storage tank, and it is possible to implement economically at low cost. . Further, since the slurry is not exposed to the atmosphere, the formation and solidification of the film and the deterioration of the slurry can be prevented, and the slurry can be smoothly increased and decreased in the expansion tank at all times.

Further, the film material constituting the microcapsule slurry is plastic, and chemical products such as plastic generally deteriorate with time as the temperature increases (deterioration occurs every time the temperature rises by 10 ° C.). About 2-3 degrees
However, in the third embodiment, the slurry in the expansion tank is pre-cooled by returning cold water to prevent the deterioration of the slurry and improve the heat storage efficiency. it can. In addition, 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. By performing the above-described pre-cooling with the return cold water, this kind of disturbance can be prevented.

(Fourth Embodiment) FIG.
(B) is a figure showing composition of an expansion tank in a 4th embodiment of the present invention. The expansion tank according to the fourth embodiment is different from the heat storage system shown in FIG. 1 in that the expansion tank 51 shown in the third embodiment is replaced with the expansion tank 51 shown in the third embodiment.
It is used for the purpose of further improving the hermeticity of the slurry. In 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 the slurry cannot be suppressed. It is also conceivable that the slurry is separated in an oil layer, but the specific gravity of the slurry itself is about 0.9, and light oil having a lower specific gravity is required, and the flammability of the light oil becomes a problem. Therefore,
The fourth embodiment has the following configuration. FIG.
As shown in (a) and (b) of FIG.
A diaphragm 63 of a diaphragm type is provided on a side surface in the casing 62.
Is installed, and the top of the heat storage tank 1 and the bottom of the expansion tank 61 are connected through a casing 62 by a pipe 64.

In the same manner as described above, when the slurry in the heat storage tank 1 expands, the increased amount of slurry is transferred to the heat storage tank 1.
From the expansion tank 61 via a pipe 64
Guided into 3. At this time, the diaphragm 63 swells upward as the slurry inside increases, as shown in FIG. 9A. Conversely, when the slurry in the heat storage tank 1 contracts, the reduced amount of the slurry is guided from the inside of the diaphragm 63 of the expansion tank 61 to the inside of the heat storage tank 1 via the pipe 64. At this time, the diaphragm 63
As shown in FIG. 9B, as the slurry inside decreases, it shrinks downward.

Further, pipes 65 and 66 are provided above and below the casing 62, and the return cold water (12
C) is supplied from a lower pipe 66, rises inside the casing 62, and is sucked into an upper pipe 65. Thereby, the casing 62 and the diaphragm 63
The cold water 67 is stored in the gap formed by the above. In addition, piping 6
The reference numerals 5 and 66 are provided at a height at which 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 portion of the casing 62 is open, the slurry 11 is not exposed to the atmosphere due to the interposition of the diaphragm 63, and the slurry 11 is in a sealed state.

FIGS. 10A and 10B show a fourth embodiment of the present invention.
It is a figure which shows the structure of the expansion tank of the bellows type which is a 1st modification of the expansion tank in embodiment. 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, the top of the heat storage tank 1 and the bottom of the canvas bellows 73 are connected through a casing 72 by a pipe 74.

In the same manner as described above, when the slurry in the heat storage tank 1 expands, the increased amount of slurry is transferred to the heat storage tank 1.
Through the pipe 74 and into the canvas bellows 73 of the expansion tank 71. At this time, canvas bellow 73
As shown in FIG. 10A, as the slurry inside increases, it extends upward. Conversely, when the slurry in the heat storage tank 1 shrinks, the reduced amount of the slurry is guided from the inside of the canvas bellows 73 of the expansion tank 71 into the heat storage tank 1 via the pipe 74. At this time, as shown in FIG.
It shrinks downward as the slurry inside decreases.

Further, pipes 75 and 76 are provided above and below the casing 72, respectively.
° C) is supplied from a lower pipe 76, rises inside the casing 72, and is sucked into an upper pipe 75. As a result, cold water 77 is stored in the gap between the casing 72 and the canvas bellows 73. It should be noted that the pipes 75 and 76 are configured such that even when the canvas bellows 73 is in the most extended state,
It is provided at a height where cold water 77 can be stored so as to be immersed therein. The top of the casing 72 is open,
The presence of the cold water 77 does not expose the canvas bellows 73 to the atmosphere, and the interior of the canvas bellows 73 is in a sealed state.

FIGS. 11A and 11B are diagrams showing a configuration of a sleeve type expansion tank which is a second modification of the expansion tank according to the fourth embodiment. As shown in FIGS. 11A and 11B, in the expansion tank 81, a cylinder 83 is provided on the bottom surface in the casing 82, and the top of the heat storage tank 1 and the bottom of the cylinder 83 are connected to a pipe 8.
4 and 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.

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.
From the cylinder 82 of the expansion tank 81 via a pipe 84
Guided inside. At this time, the piston 83 inserted in the cylinder 82 moves upward as the slurry inside increases, as shown in FIG. Conversely, when the slurry in the heat storage tank 1 contracts, the reduced amount of slurry is supplied to the cylinder 83 of the expansion tank 81.
It is led into the heat storage tank 1 from inside through a pipe 84. At this time, the piston 85 moves downward as the slurry inside decreases, as shown in FIG. 11B.

Further, pipes 86 and 87 are provided above and below the casing 82, respectively.
° C) is supplied from a lower pipe 87, rises inside the casing 82, and is sucked into an upper pipe 86. As a result, cold water 88 is stored in the gap between the casing 82 and the cylinder 83. In addition, piping 8
6 and 87 are provided at a height where the 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 in a sealed state.

As described above, the microcapsule slurry has a high expansion coefficient, and has a volume expansion coefficient 30 times that of water. In the fourth embodiment, by using a closed type expansion tank of a diaphragm type, a bellows type or a sleeve type, the third type is used.
Unlike the expansion tank of the pressurization method using the 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 width can be reduced. Therefore, the volume absorption amount is larger than that of the pressurized expansion tank, and it is possible to cope with a larger expansion and contraction of the slurry. Further, since the slurry is not exposed to the atmosphere, it is possible to prevent the formation and solidification of the film and the deterioration of the slurry, and the increase and decrease of the slurry are always smoothly performed in the expansion tank.

Further, the microcapsule slurry has the property that the aging deteriorates remarkably as the temperature increases, but in the fourth embodiment, the diaphragm 63, the canvas bellows 73 or the cylinder 83 is immersed in the return cold water, and the diaphragm is immersed. By pre-cooling the slurry in 63, the canvas bellows 73 or the cylinder 83, the deterioration of the slurry can be prevented, and the heat storage and heat radiation efficiency can be improved.

(Fifth Embodiment) In a fifth embodiment of the present invention, the pressurized expansion tank shown in the third embodiment and the diaphragm shown in the fourth embodiment are used. method,
The expansion tank of the bellows type or the sleeve type is connected and used 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 to the pipe 64.
(Or 74, 84) connected to the diaphragm 63 (or the 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 pressurized expansion tank 51 is used to expand and contract the slurry. When the pressure is large, the valve can be opened to use the pressurized expansion tank 51 and the expansion tank 61 (or 71, 81) of the diaphragm type (or bellows type, sleeve type) in combination. Accordingly, when a large volume absorption amount is not required, the expansion tank of the diaphragm type, the bellows type or the sleeve type having a large operating force does not need to be operated, and each expansion tank can be used efficiently.

(Sixth Embodiment) FIG. 12 is a diagram showing a configuration of a heat storage tank and an expansion tank according to a sixth embodiment. In the heat storage system according to 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 partition wall end plates. 92. In this expansion tank 91, a diaphragm type diaphragm 9 is provided on the side surface.
3 and the top of the heat storage tank 1 and the expansion tank 91
Are connected by a communication pipe 94.

As described above, when the slurry in the heat storage tank 1 expands, the increased amount of slurry is transferred to the heat storage tank 1.
Flows through the communication pipe 94 into the expansion tank 91, and conversely, when the slurry in the heat storage tank 1 shrinks,
The reduced amount of slurry is transferred from the expansion tank 91 to the pipe 9
4 flows into the heat storage tank 1.

Furthermore, the bottom of the expansion tank 91 is in contact with the top of the heat storage tank 1 via the partition head plate 92, and the slurry in the expansion tank is separated from the partition head plate 9 by the slurry in the heat storage tank.
2 to be cooled by heat transfer. The expansion tank 9
Although the top portion of 1 is open, the slurry 11 is not exposed to the atmosphere due to the interposition of the diaphragm 93, and the slurry 11 is in a sealed state.

Since the top of the expansion tank 91 is open, the slurry increases or decreases under atmospheric pressure.
Further, the heat storage tank 1 may have a pressure resistance including a liquid column head from the top of the heat storage tank to the slurry level of the expansion tank. Furthermore, the expansion tank can have a low-pressure-resistant structure such as a cone roof type at the top but is inexpensive. By installing the expansion tank 91 at the top of the heat storage tank 1 and operating under the atmospheric pressure in this manner, it is possible to reduce the cost of the expansion tank and the heat storage tank. Further, by covering the slurry 11 in the expansion tank 91 with the diaphragm 93,
Sealability of the slurry can be ensured.

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 cost. However, in the sixth embodiment, by using the expansion tank integrated with the heat storage tank, the expansion and contraction of the slurry in the heat storage tank can be freely dealt with, and it is economically implemented at low cost. be able to. Further, since the slurry is not exposed to the atmosphere, the formation and solidification of the film and the deterioration of the slurry can be prevented, and the slurry can be constantly increased and decreased in the expansion tank smoothly.

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

(Seventh Embodiment) FIG. 13 is a diagram showing a configuration of a slurry circulation circuit in a heat storage system according to a seventh embodiment. 13, the same parts as those in FIG. 1 are denoted 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 between the pipes 31 and 32 on the upstream side of the electric valves 101 and 102.
Is connected. Temperature sensors 105 and 106 are provided in the pipes 31 and 32 on the upstream side of the bypass pipe 104, respectively. Each temperature sensor 105, 106 and each electric valve 101, 10
2 and 103 are connected to the control unit 107.

Hereinafter, the operation of the heat storage system will be described.
First, it is assumed that heat storage (or heat release) is started after the heat storage system has been stopped for several days in summer. At this time, the electric valves 101, 10
2 is closed, and the electric valve 103 is opened. When the slurry pump 6 operates, the slurry in 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 temperature of the slurry in each pipe is almost normal temperature (about the temperature), but the temperature is gradually lowered by heat exchange in the heat exchanger 2.

The temperature sensor 106 detects the temperature of the slurry flowing in the pipe 32, and sends a detection signal to the control unit 107 when detecting that the temperature reaches, for example, 4.25 ° C. Upon receiving the detection signal, the control unit 107 closes the electric valve 103, and
Open 2. Thereby, the slurry circulates in the regular slurry circulation circuit, that is, 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 radiation are performed. For this reason, when the heat storage and heat radiation 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.
And the heat storage and heat radiation efficiency are reduced.

However, in the heat storage system, at the start of heat storage and heat radiation, that is, at the time of standby, the slurry does not flow into the heat storage tank 1 but circulates through the bypass pipe 104 until the temperature of the slurry in the pipe falls to the predetermined temperature. Let it.
Thereby, the slurry in the pipe is cooled down to a predetermined temperature at which normal heat storage and heat radiation are performed. Therefore,
Thereafter, the slurry is allowed to flow into the heat storage tank 1 and circulated through the regular slurry circulation circuit, whereby stable heat storage and heat radiation are performed from the start of heat storage and heat radiation, and heat storage and heat radiation efficiency are improved.

Instead of controlling the closing of the bypass circuit by detecting the temperature of the slurry with the temperature sensor as described above, the timer (not shown) in the control unit 107 lowers the temperature of the slurry in the bypass circuit. The time may be measured, and after reaching a predetermined time, control may be performed so as to close the bypass circuit.

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

(Eighth Embodiment) FIG. 14 is a diagram showing a configuration of an oil content measuring section according to the eighth embodiment.
This oil measurement unit is installed in the heat storage tank 1 in the heat storage system shown in FIG. The paraffin flowing out of the collapsed microcapsules has a characteristic that the specific gravity is smaller than that of water. Therefore, the paraffins rise due to buoyancy separation and are unevenly distributed above the heat storage tank 1. A connecting pipe 11 is provided at the top of the heat storage tank 1.
The lower end of the sampling pot 112 is connected to an upper end of the connection pipe 111. Further, the middle part of the connection pipe 111 is connected to the top of an expansion tank 114 located below the connection pipe 111 via a pipe 113, and the upper part of the expansion tank 114 is located below the expansion tank 114 via a pipe 115. It is connected to a located sampler 116. Further, the sampling pot 112 is connected to a 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. Also, when the microcapsule slurry in the heat storage tank 1 shrinks,
The slurry in the expansion tank 114 is connected to the pipe 113 and the connecting pipe 1.
11 flows into the heat storage tank 1.

When the expansion and contraction of the slurry occurs, the connecting pipe 11 connecting the heat storage tank 1 and the expansion tank 114 is connected.
Slurry flows into 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 is subjected to the sampling pot 112 and the expansion tank
4 and the heat storage tank 1. Here, the valve 124 is normally closed in the sampling pot 112,
At the time of inflation, the level sensor 121 detects the presence of the microcapsule slurry, opens the valve 124, and sets the sampler 11
6. Transfer the microcapsule slurry to 6. The oil content of the microcapsule slurry containing a large amount of paraffin is measured, and the oil content of the microcapsule slurry in the heat storage system is managed.

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

Similarly, in the expansion tank 114, the valve 123 is normally closed. Level sensor 1 when inflated
22 detects the presence of the microcapsule slurry and
23 is opened and the microcapsule slurry is moved to the sampler 116. The oil content of the microcapsule slurry containing a large amount of paraffin is measured, and the oil content of the microcapsule slurry in the heat storage system is managed. Also, a sample can 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 thereby improve the aging efficiency of the heat exchanger. Can be prevented and predetermined performance can be maintained.

The present invention is not limited to the above embodiments, but can be implemented with appropriate modifications without departing from the scope of the invention.

[0108]

According to the heat storage system according to the first aspect of the present invention, a uniform speed distribution in the height direction can be obtained with respect to the rising or lowering speed of the slurry. Since stratification is obtained and the dead water area between the ceiling plate and the upper and lower outlets and between the bottom plate and the lower outlet and inlet is reduced, the heat storage tank is effectively used for heat storage and heat dissipation. be able to.

According to the heat storage tank according to the second aspect of the present invention, a uniform velocity distribution in the height direction can be obtained with respect to the rising or lowering speed of the slurry, so that a uniform temperature stratification in the heat storage tank can be obtained. 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 radiation.

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

According to the heat storage tank of the fourth aspect of the present invention, a uniform velocity distribution in the height direction can be obtained with respect to the rising or lowering speed of the slurry, so that a uniform temperature stratification in the heat storage tank. It is possible to effectively use the heat storage tank for heat storage and heat dissipation because the dead water area between the ceiling plate and the upper flow outlet and between the bottom plate and the lower flow outlet is reduced. it can.

According to the heat storage system of the fifth aspect of the present invention, a uniform speed distribution in the height direction can be obtained with respect to the rising or lowering speed of the slurry, so that a uniform temperature stratification can be achieved in the heat storage tank. As a result, since the dead water area near the ceiling flat plate and the bottom flat plate is reduced, the inside of the heat storage tank can be effectively used for heat storage and heat radiation.

According to the heat storage tank according to the sixth aspect of the present invention, a uniform velocity distribution in the height direction can be obtained with respect to the rising or lowering speed of the slurry. As a result, since the dead water area near the ceiling flat plate and the bottom flat plate is reduced, the inside of the heat storage tank can be effectively used for heat storage and heat radiation.

According to the heat storage system according to the seventh aspect of the present invention, by using the closed auxiliary tank, expansion and contraction of the slurry in the heat storage tank can be freely dealt with, and economical at low cost. It can be implemented in a practical manner. Further, since the slurry is not exposed to the atmosphere, it is possible to prevent the generation and solidification phenomenon of the microcapsule aggregated film and the deterioration of the slurry, and the increase and decrease of the slurry are always smoothly performed in the expansion tank.

According to the heat storage system of the present invention, the increase and decrease of the slurry in the auxiliary tank occur under the atmospheric pressure, and the slurry in the heat storage tank does not cause liquid column separation. At the same time, the design pressure of the heat storage tank can be reduced, and the cost can be significantly reduced. According to the heat storage system of the ninth aspect of the present invention, by performing pre-cooling of the slurry in the auxiliary tank with the return water, deterioration of the slurry can be prevented, and heat storage and heat radiation efficiency can be improved. . Further, it is possible to prevent thermal disturbance to the heat storage tank due to 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 width can be reduced. Therefore, the volume absorption amount is increased, and it is possible to cope with larger expansion and contraction of the slurry. In addition, since the slurry is not exposed to the air, it is possible to prevent the generation and solidification of the microcapsule aggregated film and the deterioration of the slurry,
The slurry is constantly smoothly increased and decreased in the auxiliary tank.

According to the heat storage system of the present invention, by pre-cooling the slurry in the diaphragm member by the return water, deterioration of the slurry is prevented, and
Heat radiation efficiency can be improved.

According to the auxiliary tank according to the twelfth 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 width can be reduced. Therefore, the volume absorption amount increases, and it is possible to freely cope with larger expansion and contraction of the slurry. Further, since the slurry is not exposed to the atmosphere, it is possible to prevent the generation and solidification phenomenon of the microcapsule aggregated film and the deterioration of the slurry, and the increase and decrease of the slurry are always smoothly performed in the auxiliary tank.

According to the heat storage system of the present invention, the design pressure of the heat storage tank and the auxiliary tank can be reduced by installing the auxiliary tank integrally with the upper part of the heat storage tank. Cost can be reduced. Also,
Since the slurry is not exposed to the atmosphere by the diaphragm member installed in the auxiliary tank, the deterioration of the microcapsule slurry can be prevented, and the slurry can be smoothly increased and decreased constantly in the auxiliary tank. Furthermore, since the slurry is cooled via the partition head plate of the heat storage tank, the deterioration of the slurry can be prevented, and the heat storage and heat radiation efficiency can be improved.

[0120] According to the stratified temperature type heat storage tank 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 provided on the upper part of the heat storage tank, so that the heat storage is realized. The design pressure of the tank and the auxiliary tank can be reduced, and the cost can be significantly reduced. In addition, there is no need for an auxiliary tank installation place other than the heat storage tank,
Space can be saved.

According to the heat storage system according to the fifteenth aspect 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 radiation are performed, and heat storage and heat radiation efficiency are improved.

According to 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 release, and then the slurry is stored in the heat storage tank. By causing the heat to flow and circulating through the regular circulation circuit, heat storage and heat radiation are performed stably from the start of heat storage and heat radiation, and heat storage and heat radiation efficiency are improved.

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

[Brief description of the 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 modification 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 present 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 view 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 illustrating a configuration of an oil measurement unit according to an eighth embodiment of the present invention.

FIG. 15 is a side sectional view showing the configuration 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 a heat storage system according to a 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]

DESCRIPTION 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 ... Cooled water pump 8 ... Cold water pump 9 ... Cooling tower 21 ... Ceiling head plate 22 ... Bottom head plate 23,24,25,26 ... Outflow / inflow device (reversed 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 (rotating flow outflow / inflow device) 45 ... Nozzle 51 ... Expansion tank 52 ... Piping 53 ... Piping 61 ... Expansion tank 62 ... Casing 63 ... diaphragm 64 ... pipe 65,66 ... pipe 67 ... cold water 71 ... expansion tank 72 ... casing 73 ... canvas bellow 74 ... pipe 75,76 ... pipe 77 ... cold water 81 ... Expansion tank 82 ... Casing 83 ... Cylinder 84 ... Piping 85 ... Piston 86, 87 ... Piping 88 ... Cold water 91 ... Expansion tank 92 ... Partition wall 93 ... Diaphragm 94 ... Piping 101, 102, 103 ... Electric valve 104 ... Bypass piping 105, 106 temperature sensor 107 control unit 111 connecting pipe 112 sampling pot 113, 117, 118 pipe 114 expansion tank 115 pipe 116 sampler

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Akira Fukuda, Inventor, 24, Kinone Jindai, Narita, Chiba Prefecture Inside the New Tokyo International Airport Corporation (72) Inventor, Tadashi Tsuno 24, Kinone Jindai, Narita, Chiba, Japan (72) Inventor Toshihiro Suzuki 24, Kinone Jindai, Narita City, Chiba Prefecture New Tokyo International Airport Corporation (72) Inventor Toshio Tashiro 24, Kinone Jindai, Narita City, Chiba Prefecture New Tokyo International Airport Corporation (72) Inventor Takao Yokose 24, Kinonejidai, Narita-shi, Chiba Pref. Inside the New Tokyo International Airport Corporation (72) Inventor Seiji Shibuya 2-1-1, Aramachi-cho, Niihama, Takasago-shi, Hyogo Mitsubishi Heavy Industries, Ltd. 2-1-1 Niihama, Arai-machi, Takasago City, Hyogo Prefecture Inside the Takasago Works, Mitsubishi Heavy Industries, Ltd. (72) Inventor Yoshinori Shirakata Niihama, Arai-machi, Takasago City, Hyogo Prefecture 2-1-1, Mitsubishi Heavy Industries, Ltd. Takasago Research Laboratory (72) Inventor Yoichiro Iriya 2-1-1, Araimachi, Takasago, Hyogo Prefecture Mitsubishi Heavy Industries, Ltd. Takasago Research Laboratory (72) Inventor Tadaaki Yai Takasago, Hyogo Prefecture 2-1-1, Niihama, Araimachi Inside the Takasago Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Mika Shinka 2-1-1, Niihama, Araimachi, Takasago-shi, Hyogo Prefecture Inside the Takasago Laboratory, Mitsubishi Heavy Industries, Ltd.

Claims (17)

[Claims] 1. A heat storage system that uses, as a heat storage material, a slurry composed of fine capsules in which a core substance with a phase change is enclosed and a liquid, wherein the heat storage tank stores the slurry; A circulation circuit for circulating the slurry; and a heat exchanger for performing heat exchange between the slurry and a heat utilization medium circulated by the circulation circuit, wherein the heat storage tanks are respectively provided in the heat storage tanks. A plurality of holes provided in a substantially annular shape so as to face the ceiling plate and the floor plate, and at least one set of an inflow / outflow device for flowing out and inflow of the slurry through each of the holes. system. 2. A heat storage tank for storing a fluid or a slurry acting as a heat storage material, comprising a header ring having a plurality of substantially annular holes formed in the tank so as to face the ceiling plate and the floor plate, respectively. A heat storage tank comprising at least one set of an inflow / outflow device for flowing out and inflow of the liquid or slurry through each of the holes. 3. The heat storage tank according to claim 2, wherein each of the inflow / outflow devices includes a plurality of the header rings in a concentric shape. 4. The heat storage tank according to claim 2, wherein each of the outflow / inflow devices is provided with a plurality of the header rings. 5. A heat storage system using, as a heat storage material, a slurry composed of fine capsules in which a core substance with a phase change is enclosed and a liquid, wherein: a heat storage tank for storing the slurry; A circulation circuit for circulating the slurry, and a heat exchanger for performing heat exchange between the slurry and a heat utilization medium circulated by the circulation circuit, wherein a ceiling flat plate and a floor flat plate of the heat storage tank are provided. A set of inflow / outflow ports are provided so as to surround the heat storage tanks in the vicinity, respectively, and have a plurality of holes through which the slurry flows out into the heat storage tank in a swirling manner and the slurry flows from the heat storage tank in a swirling manner. A heat storage system comprising a vessel. 6. A heat storage tank for storing a fluid or a slurry acting as a heat storage material, provided near the ceiling flat plate and the floor flat plate of the tank so as to surround the heat storage tank, and the liquid storage tank is provided in the heat storage tank. Alternatively, a heat storage tank is provided with a set of inflow / outflow devices having a plurality of nozzles for discharging the slurry in a swirl shape and for flowing the liquid or slurry from the heat storage tank in a swirl shape. 7. A heat storage system using, as a heat storage material, a slurry composed of microcapsules in which a core substance with a phase change is enclosed and a liquid, a heat storage tank for storing the slurry, and a slurry in the heat storage tank. A closed auxiliary tank for flowing slurry from the heat storage tank and flowing out the slurry to the heat storage tank in accordance with the expansion and contraction of the heat storage tank; a circulation circuit for circulating the slurry in the heat storage tank; A heat exchanger for performing heat exchange between the slurry circulated by a circuit and the heat utilization medium. 8. The heat storage tank may be located at a position below the top of the heat storage tank.
The heat storage system according to claim 7, wherein the heat storage system is provided so as to be located within 0 m. 9. The method according to claim 7, wherein the slurry in the auxiliary tank is cooled by return water to the heat storage system.
Or the heat storage system according to 8. 10. The auxiliary tank includes a container and a diaphragm member provided in the container, wherein the diaphragm member is immersed in the container so that the inside of the diaphragm member is sealed with a fluid, The heat storage system according to claim 7 or 8, wherein the slurry flows in from the heat storage tank and flows out to the heat storage tank in accordance with expansion and contraction of the slurry in the tank. 11. The heat storage system according to claim 10, wherein the fluid is return water to the heat storage system. 12. A closed auxiliary tank for flowing slurry from said heat storage tank and flowing out slurry to said heat storage tank in accordance with expansion and contraction of the slurry in the heat storage tank. An auxiliary tank, comprising: a provided diaphragm member; and wherein the diaphragm member is immersed in the container so that the inside of the diaphragm member is sealed by a fluid. 13. The auxiliary tank is provided integrally with an upper part of the heat storage tank and includes a diaphragm member provided in the container. In the container, the slurry is sealed by the diaphragm member, and the heat storage is performed. The heat storage system according to claim 7, wherein the slurry flows in from the heat storage tank and flows out to the heat storage tank in accordance with expansion and contraction of the slurry in the tank. 14. A stratified temperature type heat storage tank using a fluid as a heat storage material, wherein the heat storage tank stores the fluid, and the fluid flows from the heat storage tank according to expansion and contraction of the fluid in the heat storage tank. A stratified temperature type heat storage tank, comprising: an auxiliary tank integrally provided above the heat storage tank for discharging a fluid to the heat storage tank. 15. A heat storage system using, as a heat storage material, a slurry composed of fine capsules in which a core substance with a phase change is enclosed and a liquid, wherein: a heat storage tank for storing the slurry; A circulation circuit for circulating the slurry; a heat exchanger for performing heat exchange between the slurry circulated by the circulation circuit and the heat utilization medium; and a slurry in the circulation circuit at the start of heat storage or heat release. Means for lowering or raising the temperature to a predetermined temperature and then flowing the same into the heat storage tank. 16. A heat storage system using, as a heat storage material, a slurry composed of fine capsules in which a core substance with a phase change is enclosed and a liquid, wherein: a heat storage tank for storing the slurry; A circulation circuit for circulating the slurry, a heat exchanger for exchanging heat between the slurry circulated by the circulation circuit and a heat utilization medium, and two pipes of the circulation circuit connected to the heat storage tank And two temperature detecting means provided in each of the two pipes and detecting a temperature of the slurry in each of the pipes; and at least one set of first shutoffs provided in the two pipes. A valve, at least one second shutoff valve provided in the bypass pipe, and individually opening the first shutoff valve and the second shutoff valve based on a detection result of the temperature detecting means. By, thermal storage system, characterized in that after flowing the slurry in the circulation circuit to the bypass pipe, equipped with a, and control means for controlling so as to flow into the heat storage tank. 17. A heat storage system using, as a heat storage material, a slurry composed of a microcapsule in which a core substance with a phase change is enclosed and a liquid, wherein: a heat storage tank for storing the slurry; A circulation circuit for circulating the slurry, a heat exchanger for performing heat exchange between the slurry and a heat utilization medium circulated by the circulation circuit, and in accordance with expansion and contraction of the slurry in the heat storage tank, A closed-type auxiliary tank that flows in the slurry from the heat storage tank and flows out the slurry to the heat storage tank; and a collection tank that is provided on the top of the heat storage tank and collects the slurry with the action of the auxiliary tank. An extractor for extracting the slurry contained in at least one of the collection tank and the auxiliary tank.