JPH0257867A - Latent heat accumulator - Google Patents

Abstract

PURPOSE:To maintain the temperature of water at a temperature capable of insulating from a normal heat insulator, and to reduce its cost by suitably setting the volume of a water storage space with respect to the heat storage temperature and time of a heat storage material. CONSTITUTION:Water in a heat exchanging tube 6 is heated by the heat of a heat storage material 7, and water filled in a water storage space 4 is simultaneously heated through the wall of an inner tank. If the volume of the space 4 is suitably set with respect to heat storage temperature and time, the water is not evaporated to steam, and can be stored in a hot water state. Accordingly, even if the heat insulator of an outer tank is of general heat insulator such as glass wool, etc., the quantity of leakage heat can be stopped to an allowable degree. When the fact that water temperature in the space 4 is reduced to a predetermined temperature or lower is detected by a thermocouple 12, a solenoid valve 13 is opened. When a mixture water plug 17 is opened, hot temperature water in the tube 6 is fed into the space 4, and the temperature of the hot water therein is raised. Since the hot water or steam in the tube 6 is once introduced into the water in the space, there is no danger of outputting the hot water or steam of high temperature from the plug 17.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a latent heat storage device that stores heat using a latent heat storage material and extracts and utilizes the heat in the form of hot water or steam.

By storing energy such as night electricity and industrial waste heat as heat,
Inorganic compounds such as caustic soda-based compounds, or eutectic mixed salts thereof, are often promising as heat storage materials for latent heat storage devices that can be extracted and used as needed, as they have relatively large latent heat and are inexpensive. (For example, Electronic Technology Research Institute Investigation Report (No. 213) "Load-following power generation in nuclear power plants using latent heat storage") However, since these materials have a high melting point of approximately 300°C, they cannot be used in the form of hot water or low-pressure steam. When used as a heat storage material in a heat storage device used in

In view of the above-mentioned circumstances, the present invention aims to store heat in a heat storage material having a heat storage temperature of, for example, about 300°C by using inexpensive heat insulating materials that have been commonly used and heat exchange technology. An object of the present invention is to provide a latent heat storage device suitable for extracting and utilizing the heat generated in the form of hot water or low-pressure steam.

A latent heat storage device for hot water according to the present invention in order to achieve the above-mentioned problems consists of an inner tank and an inner tank, each of which is formed by filling a heat insulating material between two double walls, and which are spaced apart from each other. The inner tank has an outer tank, and a heat exchange pipe connected to an external water supply pipe to allow water to be heated and used as hot water to flow through the inner tank.

means for heating the latent heat storage material and filled with the latent heat storage material, and the space between the inner tank and the outer tank communicates with the heat exchange pipe via a valve on the outlet side and extends to the outside. It is characterized by being connected to a hot water outlet pipe and filled with water to be heated and used as hot water.

Further, the latent heat storage device for steam according to the present invention has an inner tank and an outer tank, each of which is formed by filling a double wall with a heat insulating material, and which are spaced apart from each other.

The inner tank is provided with a heat exchange tube that allows water to be heated and used as steam to flow through it and a means for heating the latent heat storage material, and is filled with the latent heat storage material, and the inner tank and the outer tank are The space between is connected to the external water supply pipe and the inlet side of the heat exchange pipe.

The outlet side of the heat exchange tube is specially designed to be connected to a steam extraction tube.

Since the heat storage device of the present invention is constructed as described above, during heat storage, the heat storage material heats the water in the heat exchange tube, and the heat that has leaked to some extent through the insulation material on the inner tank wall is transferred to the inner and outer tanks. The temperature in the water storage space between the The heat of this water will be insulated by the heat insulating material in the outer tank, but by appropriately setting the volume of the water storage space in relation to the heat storage temperature and heat storage time of the heat storage material, the temperature of the water inside can be maintained at a normal temperature. It is possible to maintain the temperature at a level that can be insulated by using the heat insulating material. When hot water or steam is extracted and used, the water in the water storage space is replaced by the extracted amount from the external water supply pipe, so that the temperature is maintained below a predetermined temperature.

Embodiments Below, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a sectional view showing the structure of an embodiment of a latent heat storage device for hot water according to the present invention.

The heat storage device 1 has a double structure consisting of an inner tank 2 and an outer tank 3, each of which has a double wall filled with a heat insulating material, and there is a space between these that can store water. 4 is formed. As the heat insulating material for the inner tank 2, for example, rock wool is used, and as the heat insulating material for the outer tank 3, for example, an ordinary heat insulating material commonly used in the past, such as glass wool, is used.

The inner tank 2 has a heat exchange pipe 6 connected to an external water supply pipe 5.
．． A heating means (not shown) is provided for heating the latent heat storage material using late-night electricity, industrial waste heat, etc., and the remaining space is filled with a latent heat storage material 7 such as a caustic soda-based eutectic mixed salt. ing.

In the case of the illustrated embodiment, the heat exchange tube 6 is formed by connecting a plurality of straight tubes in parallel between headers provided at the top and bottom, respectively, and is supported by a mesh metal support member 8 in the form of a lattice. This support member also has the function of increasing the heat transfer area during heat exchange and generating turbulence when the molten heat storage material flows, thereby promoting heat transfer.

A check valve 9 is provided in the piping from the water supply pipe 5 to the heat exchange pipe 6 to prevent water heated by the heat storage device from flowing back. A pipe 10 is provided that branches from the upstream side of the check valve 9 and reaches the water storage space 4 between the inner and outer tanks, and in the middle of this pipe 10 is a float that is closed when the water surface reaches the top of the water storage space. A valve 11 is provided, which keeps the water storage space 4 filled with water at all times.

An extraction pipe extending from the outlet side header of the heat exchange tube 6 leads to the water storage space 4 through a solenoid valve 13 that is opened by a signal from a thermocouple 12 that detects the temperature of the water in the water storage space 4 . Further, a pipe 14 branched from the upstream side of the electromagnetic valve 13 reaches the water storage space 4 via a check valve 15.

A hot water outlet pipe 16 is provided in the water storage space 4 and connected to a hot water mixing faucet 17 . Further, a safety 18 is provided at the top of the water storage space 4.

Since this device is configured as described above, the heat of the heat storage material 7 not only heats the water in the heat exchange tube 6 but also heats the water filling the water storage space 4 via the inner tank wall. By appropriately setting the volume of the water storage space 4 with respect to the heat storage temperature and heat storage time, the water therein does not turn into steam and can be stored in a hot water state. Therefore, even if the heat insulating material of the outer tank is a material with a heat insulating property that has been commonly used in the past, such as glass wool, the amount of leaked heat can be kept to an allowable level.

When the mixing faucet 17 for utilizing hot water is opened, the hot water in the water storage space 4 is discharged at water supply pressure via the water supply pipe 5.10 and the float valve 11. In this case, it is conventionally known that when the temperature of the hot water in the water storage space 4 is high, the amount of cold water mixed by the mixing faucet 17 is automatically increased.

When the thermocouple 12 detects that the water temperature in the water storage space 4 has fallen below a predetermined temperature, the solenoid valve 13 opens.
When the mixing faucet 17 is opened, the high temperature hot water in the heat exchange pipe 6 flows into the water storage space 4, and the temperature of the hot water therein rises. Since the high-temperature hot water or steam in the heat exchange tube 6 is guided into the water in the phlegm storage space, there is no possibility that the high-temperature hot water or steam will come out from the faucet 17.

During heat storage, the water remaining in the heat exchange tube 6 vaporizes and becomes high pressure, but by appropriately setting the cracking pressure of the check valve 15, the pressure can be released into the water storage space 4. This prevents the pressure from rising abnormally, and at this time, the steam injected into the water storage space 4 heats the water therein and raises its temperature.

FIG. 2 shows an embodiment of a latent heat storage device that extracts heat stored in a latent heat storage material as steam or high-temperature water. In this embodiment, a water storage space 4 is provided between an inner tank 2 and an outer tank 3, each of which has a double wall filled with a heat insulating material, and the inner tank contains water to be heated and used. This embodiment is similar to the above-mentioned embodiment in that a heat exchange tube 6 through which heat flows through and a heating means (not shown) are provided, and the remaining space is filled with a latent heat storage material 7.

However, in this embodiment, the water supply pipe 5 is only introduced into the water storage space 4 via a float valve 11 that closes when the water level in the water storage space reaches the highest level.

The inlet side of the heat exchange pipe 6 is open to the water storage space 4 via a check valve 9. Also, the outlet side of the heat exchange pipe 6 is branched into two, and the branch pipe is connected to the water storage space via the check valve 15, which is the same as in the previous embodiment, but the main pipe is removed. It is connected directly to the pipe 16 and is provided with a valve 2°.

Therefore, in the heat storage state, the heat of the latent heat storage material 7 heats the water in the heat exchange tube 6 to steam, and also heats the water in the water storage space through the inner tank wall to raise the temperature. heat storage temperature,
If the 8 noodles in the water storage space 4 are set appropriately for the heat storage time, the temperature of the water therein can be sufficiently insulated with a conventionally commonly used heat insulating material. Also, check valve 1
This is similar to the previous embodiment of No.5.

When taking out steam, by opening the valve 20, the steam in the heat exchange pipe 6 can be taken out. When the steam in the heat exchange pipe 6 decreases, the check valve 9 opens, and the hot water in the water storage space 4 flows in at the water supply pressure of the water supply pipe 5, is heated by the heat storage material 7, and becomes steam.

Note that if the load pressure at the end of the take-out pipe 16 is increased, high-temperature water can also be taken out.

As described above, according to the present invention, the insulation of a latent heat storage device with a high heat storage temperature can be improved to prevent heat leakage by using an inexpensive insulation material that has conventionally been used as insulation material for night-time power water heaters, etc. This can be done without increasing the cost, resulting in cost reduction.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment in which the present invention is applied to a latent heat storage device for hot water, and FIG. 2 is a longitudinal sectional view showing an embodiment in which the invention is applied to a latent heat storage device for steam. ... Heat storage device ... Outer tank ... Water supply pipe ... Latent heat storage material 1 ... Float valve 3 ... Solenoid valve 7 ... Mixing faucet 2 ... Inner tank 4 ... Water storage space 6...Heat exchange pipe 9.15...Check valve 12...Thermocouple 16...Hot water or steam extraction pipe 20...Valve

Claims (2)

[Claims] (1) Each double wall is filled with a heat insulating material, and has an inner tank and an outer tank spaced apart from each other, and the inner tank is connected to an external water supply pipe and heated. A heat exchange pipe through which water to be used as hot water flows through, and means for heating the latent heat storage material are provided, and the space between the inner tank and the outer tank is filled with the latent heat storage material, and the space between the inner tank and the outer tank is 1. A hot water latent heat storage device, characterized in that a hot water take-out pipe is connected to the pipe outlet side through a valve and extends to the outside, and is filled with water to be heated and used as hot water. (2) It has an inner tank and an outer tank, which are each made of a double wall filled with insulation material and are spaced apart from each other, and the inner tank contains water that is to be heated and used as steam. A heat exchange pipe that makes steam flow through the tank and a means for heating the latent heat storage material are provided, and the space between the inner tank and the outer tank is filled with the latent heat storage material, and the space between the inner tank and the outer tank is filled with an external water supply pipe and the A latent heat storage device for steam, characterized in that the inlet side of the heat exchange tube is connected to the inlet side of the heat exchange tube, and the outlet side of the heat exchange tube is connected to a steam extraction tube.