JPH0271052A - Sensible heat storage device - Google Patents

Abstract

PURPOSE:To maintain predetermined heat storage temperature and to dissipate heat by removing the heat of heat storage liquid stored in a high temperature liquid space, feeding the liquid in which its temperature is reduced to a low temperature liquid space, applying the heat of an external heat source to the liquid of low temperature to heat it, and feeding it to the high temperature liquid space. CONSTITUTION:The upper space of a float 4 becomes a high temperature liquid space 6, and the lower space becomes a low temperature liquid space 6. A recess is formed at the center of the upper surface (i.e., the face at the high temperature liquid space side) of the float, a bendable tube 8 is disposed from the lower end of a through hole formed from the bottom through the float by a swivel joint out of a storage tank 2 from the lower part of its sidewall through the space 6, and opened with the space 6 in the tank 2 through a feed pump 9 and a heat sink unit EX-2. On the other hand, a conduit 11 opened in the sidewall of the space 5 is provided through a feed pump 10, a heater EX-2 by an external heat source out of the lower part of the sidewall of the space 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat storage device that stores heat by utilizing the sensible heat of soaked water.

As a heat storage material used in a heat storage device that heats and stores heat with an external heat source and extracts and uses the M-heated heat as needed,
There are latent heat storage materials that utilize the latent heat of fusion of substances, and sensible heat storage materials that utilize the specific heat of substances.

Water has an extremely high specific heat among all substances, is chemically stable, can be used directly, and is extremely cheap. Currently, it is used exclusively as a heat storage material for water heaters that use late-night electricity.

However, since water evaporates at 100 degrees Celsius, the heat storage temperature is low enough to be used as a heat source for generating industrial high-pressure steam, etc., and as a sensible heat storage device with a heat storage temperature of several hundred degrees, no heat is generated even at the heat storage temperature. Special oils, etc. are used.

By the way, in a sensible heat storage device, if heat exchange piping is provided in the heat storage tank and the heat stored in the heat storage material is extracted using the utilization fluid or heat transfer fluid, the temperature of the heat storage material will gradually decrease and remain constant. The drawback is that it is difficult to extract a certain amount of heat at a given temperature.

As a sensible heat storage device that can solve this problem and keep the temperature of the heat storage material constant even when the stored heat is taken out, for example, 1ECEC (Intersociety Entry) is available.
ergy Conversion Engine
'ring Conference)'
Thermal Energy Storage a
The paper titled ``t900℃'' describes a two-tank sensible heat storage device (t900℃).
wo generic type of
(Lhermal storage tank)
is introduced. This system has two liquid tanks, a high-temperature liquid tank and a low-temperature liquid tank.The high-temperature liquid tank stores the heat storage liquid heated to a predetermined heat storage temperature, and when heat is used, the liquid stored in the high-temperature liquid tank is taken out. The liquid whose temperature has been lowered by this is transferred to a low-temperature liquid tank and stored, and when storing heat, the liquid is taken out from the low-temperature liquid tank, heated to a predetermined heat storage temperature by an external heat source, and transferred to a high-temperature liquid tank. It is something to accumulate.

In this system, the total amount of heat storage liquid stored inside the high temperature liquid tank and the low temperature liquid tank is constant. Therefore, as one type of this system, the paper describes a vertical cylindrical storage tank with a raft that extends over its entire cross section that can be raised and lowered, and the space inside the tank is divided into upper and lower parts, and the upper part of the raft is The lower part of the raft is used as a high-temperature liquid space, and the lower part of the raft is used as a low-temperature liquid space.The high-temperature liquid space stores a molten salt of 2CO3 (Li-Na-) at 900°C, and the same molten salt at 425°C is stored in the low-temperature liquid space. A system for storing information is disclosed.

The present invention provides a sensible heat storage device of a type in which the interior of the above-mentioned vertical cylindrical storage tank is divided into upper and lower halves by a float (raft) that can be raised and lowered to create a high-temperature liquid space and a low-temperature liquid space. It is an object of the present invention to provide a concrete configuration for storing external heat using a heat exchanger and extracting and utilizing the stored heat.

In order to accomplish the above-mentioned problems, the present invention provides a sensible heat storage device of the type described above, in which one high-temperature liquid space is separated from the other low-temperature liquid space in a storage tank space partitioned by a float. A radiator installed in the middle of the pipe to transfer the heat storage liquid to the pipe, a radiator installed in the middle of the pipe to radiate heat from the liquid flowing inside the pipe, a pipe to transfer the heat storage liquid from the low-temperature liquid space to the high-temperature liquid space, and the pipe to transfer the heat storage liquid from the low-temperature liquid space to the high-temperature liquid space. The liquid is heated by an external heat source.

1 - With the above configuration, the heat storage liquid is heated to a predetermined heat storage temperature by an external heat source via a heater and stored in the high temperature liquid space, and when extracting heat, the high temperature liquid stored in the high temperature liquid space is The liquid is transferred to the low-temperature liquid space through a pipe, during which time the required heat is extracted through a radiator, and the liquid whose temperature has decreased is stored in the low-temperature liquid space. As a result, the high-temperature liquid decreases and the low-temperature liquid increases, but as the float moves up and down, the volume of the rain space changes depending on the amount of liquid.

The embodiment structure and operation of the above invention will be made clear by the following detailed description of the embodiments with reference to the drawings.

Support 1λ FIG. 1 is a diagram showing the overall configuration of an embodiment of the present invention.

The outer circumferential wall of the vertical cylindrical tank 2 installed on the base Fal is properly insulated 3, and its internal space extends over almost the entire horizontal section, and is divided into two spaces, upper and lower, by a float 4 that can move up and down. It is divided into. In this example,
The upper space of the float 4 is a high temperature liquid space 5, and the lower space is a low temperature liquid space 6. A recess is provided in the center of the upper surface of the float (i.e., the surface facing the high-temperature liquid space), and a tube 8 that can be bent by a swivel joint is connected to the low-temperature liquid space from the lower end of the through-hole that penetrates the float from the bottom. 6 and exits from the lower part of the side wall to the outside of the storage tank 2, and a transfer pump 9,
After passing through the radiator EX-2, it opens into the low temperature liquid space in the storage tank 2.

On the other hand, a pipe line 11 is provided which exits from the lower part of the side wall of the low temperature liquid space 6, passes through a transfer pump 10, a heater EX-1 using an external heat source, and opens into the side wall of the high temperature liquid space.

In the storage tank 2, a liquid that does not evaporate at a predetermined heat storage temperature and pressure, such as a heat medium liquid that does not evaporate even at high temperatures, such as Dowsum, Neo SK, and Caloria (all trade names), is used as a heat storage material to connect the high temperature liquid space 5 and the low temperature liquid. The space 6 is filled.

A breathing tank 13 is connected to the upper part of the internal space of the storage tank 2 via a pipe 12 that penetrates the storage tank wall and extends to the outside. The inside of the pleading tank 13 is divided into upper and lower parts by a rubber membrane 14, and a weight 15 is placed in the center of the rubber membrane. The internal space of the storage tank 2 is pressurized with this pressure via the pipe 12.

The storage tank 2 can be made of any metal, concrete, fine ceramic brick, or a hybrid system using a combination thereof. Although the figure shows an above-ground tank, it is also possible to use an underground or semi-underground tank.

Further, in the above example, the space above the float 4 is a high-temperature liquid space, and the space below is a low-temperature liquid space, but the opposite may be used.

If the specific gravity of the float 4 is made approximately equal to the specific gravity of the heat storage liquid to be stored, it can be automatically stopped at any position. The float automatically moves so that the volume of the rain space becomes the required volume.

When moving the float by controlling its position, the liquid temperature in the high-temperature liquid space is detected, the detected temperature is compared with a predetermined high-temperature liquid storage temperature, and the liquid transfer pump 9 is operated so that the temperature difference becomes zero. The position of the float may be controlled along with the flow rate of .1.0. Or heater EX-1 or radiator EX
It is also possible to detect the heating amount or heat radiation amount of −2 and control the amount of elevation of the float based on the detected value.

To keep the float horizontal at all times, see Figure 2 (a) and (b).
It is advisable to provide a balancing wire 16,17 of the rope as shown in ). Also, when moving the float with a drive source,
As shown in FIGS. 3(a) and 3(b), the boo 118 provided on one side of the balance wire may be driven by one drive source.

In addition, when a circular float is provided in a vertical cylindrical storage tank, the float rotates around the center within the tank, so for example, a frame is provided in the vertical direction on the inner surface of the side wall and is engaged with the float. It is necessary to provide a mechanism to prevent the float from rotating, such as by making a notch and engaging it.

The temperature difference between the heat storage liquid in the high temperature liquid space and the low temperature liquid space partitioned by the float is such that, for example, the temperature of the high temperature liquid is 30°C.
If the temperature of the low-temperature liquid is 0°C and 100°C, it will be 200°C, which is an extremely large temperature difference. Therefore, it is preferable to fill the inside of the float with a heat insulating material or apply super insulation by evacuating it. Further, in order to adjust the difference in thermal expansion caused by the temperature difference between the upper and lower surfaces of the float, it is desirable to form a membrane shape with wrinkles on at least one surface.

Furthermore, if there is a large gap between the inner surface of the side wall of the storage tank and the outer periphery of the float, the liquid stored in both spaces will mix through this gap, so it is preferable to provide a sealing means on the periphery of the float.

As a sealing means, as shown in Fig. 1(a), a plurality of balanced ring-shaped horizontal protruding plates 20 are provided on the edge of the float so as to be close to the inner surface of the storage tank wall with a small gap to form a labyrinth. As shown in FIG. 4(b), an elastic thin metal plate 21 is bent into an arcuate cross section and resiliently pressed against the inner surface of the storage tank wall, or a flexible membrane 22 is bent as shown in FIG. 4(c).
It is possible to use one in which the inside is filled with a foam material 23.

It goes without saying that the materials of these sealing members should be able to withstand the temperature of the stored liquid.However, if the space above the float is a high temperature liquid space and the space below is a low temperature liquid space, As shown in Fig. 5, even if a through hole 24 of an appropriate size is made in the float 4, no convection will occur between the upper and lower spaces. It is even more effective to provide the float 4 with an appropriate number of holes of appropriate size in order to reduce the resistance to movement in this direction. In the example in Figure 1, the heater EX-1 and the radiator EX-2 are shown as separate units, but depending on the design, they may be used in common and combined into one heat exchanger. It may be used for heating and heat radiation.

In the embodiment shown in FIG. 1, the heater EX-1 is provided in the middle of the pipe line 11 from the low temperature liquid space 6 to the high temperature liquid space 5, but in the embodiment shown in FIG. 5 is a space below the float 4, and by fixing the position of the bottom at a fixed position, the heater EX-1 can be installed at the bottom. In this device, the pump 10 is connected to the low temperature liquid space 6.
The liquid that has flowed into the high-temperature liquid space via the pipe 11 is heated to a predetermined N heat temperature by the heater EX-1 and rises upward by convection, and the float 4 also increases the amount of liquid that has flowed into the high-temperature liquid space 5. will rise accordingly. In addition, in Fig. 6, heater EX
It is also possible to place the high temperature liquid space above the float 4 and the low temperature liquid space below the float 4, by setting the radiator EX-1 outside the storage tank or by setting the radiator EX-2 inside the storage tank.

The structure of the float can be any structure, such as a single-deck structure, a double-deck structure, or a ring-shaped rigid structure with a membrane inside. In consideration of providing buoyancy and heat insulation between the upper and lower spaces of the float, it is convenient to have a structure with a double shell W and heat insulation inside.

Further, the shape of the storage tank is not limited to a vertical cylindrical shape, and may be any of various known cylindrical storage tanks with a horizontal cross section such as a square or rectangle, and may also be of the pressure vessel type. The material for the inner surface of the storage tank and the float must be one that has a heat storage temperature (A grade, for example, refractory brick or INC0NEL (common product name)).

Effects As described above, the configuration of the present invention extracts the heat from the heat storage liquid stored in the high temperature/α space, transfers the low temperature heat storage 7α to the low temperature/liquid space, and transfers the heat from the external heat source to the low temperature heat storage liquid. and heat it to a high temperature/I! By transferring the liquid to a space and stably raising and lowering the float accordingly, high-temperature liquid can be stored at a constant temperature in a single storage tank without changing the overall volume.
It becomes possible to radiate heat while maintaining a constant heat storage temperature.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a system diagram showing the overall configuration of an embodiment of the present invention, and FIGS. 2(a) and 2(b) are side views showing an example of how the balance wire for preventing capsizing of the float is housed in the net. Figure, Figure 3<a
), (b) are side views showing an example of a float lifting drive device, and FIG. 4(a). <b) and (C) are cross-sectional views (not shown) of sealing devices between the peripheral edge of the float and the inner surface of the side wall of the storage tank, respectively, and Fig. 5 is a cross-sectional view (not shown) of the sealing device between the peripheral edge of the float and the inner surface of the side wall of the storage tank. FIG. 6 is a sectional view including a system diagram showing the overall configuration of the pond according to the embodiment. 2...Storage tank, 3...Insulation, 4-...Float, 5...High temperature liquid space, 6...Low temperature liquid space, 8.11...Pipe line, 9.10...Transfer pump, 1゛3...Breathing tank, 16.17... Balance wire, 19... Drive motor, 20 2L, 22.23... Sealing means, 24...
Communication opening, EX-L...heater, □□8 [- Consideration

Claims (14)

[Claims] (1) It has an insulated vertical storage tank and a float that extends over almost the entire horizontal cross section of the internal space and is movable up and down. The heat storage liquid is stored in the high temperature liquid space at a predetermined heat storage temperature and pressure, and the heat storage liquid is stored in the high temperature liquid space at a predetermined heat storage temperature and pressure. The heat storage liquid stored in the liquid space is taken out and heat radiated, the heat storage liquid that has dropped to a predetermined low temperature is stored in the low temperature liquid space, and during heat storage, the heat storage liquid in the low temperature liquid space is taken out and heated, and then transferred to the high temperature liquid space. In a vertical sensible heat storage device for storing heat storage, a pipe line that transfers the heat storage liquid from the high temperature liquid space to the low temperature liquid space of the heat storage tank, a radiator installed in the middle of the pipe line that radiates heat from the liquid flowing in the pipe, and the low temperature liquid A sensible heat storage device characterized by having a pipe for transferring a heat storage liquid from a space to a high temperature liquid space, and a heater provided in the middle of the pipe for heating the liquid flowing in the pipe using a heat source. (2) Claim 1 characterized in that the space above the float is a high-temperature liquid space, and the space below is a low-temperature liquid space.
The device described in. (3) The space below the above float is a high temperature liquid space,
2. The apparatus according to claim 1, wherein the upper space is a low temperature liquid space. (4) The apparatus according to claim 1, wherein the position of the float is operated by detecting the liquid temperature in the high-temperature liquid space so that the liquid temperature reaches a predetermined heat storage temperature. (5) The apparatus according to claim 1, wherein the position of the float is controlled by the amount of heating by the heater and the amount of heat radiated by the radiator. (6) The apparatus according to claim 1, wherein the specific gravity of the float is approximately equal to the specific gravity of the heat storage liquid. (7) Claim 1, wherein the float moves naturally due to the transfer of liquid between the spaces above and below the float, and is provided with a balance wire to prevent the float from overturning. The device described in. (8) The device according to claim 1, wherein said float is configured to move up and down while maintaining a horizontal state by applying a driving force to a balance wire from the outside. 9. The apparatus according to claim 1, further comprising rotation stopping means for preventing the float from rotating about the center line of the vertical storage tank. (10) The device according to claim 1, wherein the float is insulated. (11) Claim 1 characterized in that a sealing means for sealing between the periphery of the float and the inner surface of the storage tank wall is provided.
The device described in. (12) The device according to claim 1, wherein the float is provided with an opening that communicates the upper and lower spaces. (13) The apparatus according to claim 1, wherein means for transferring heat storage liquid between the upper and lower spaces of the float is provided in the storage tank. (14) An apparatus according to claim 1, wherein the heater is provided in a high temperature liquid space.