JPS59134497A - Heat accumulator - Google Patents

Abstract

PURPOSE:To enhance heat-accumulating density and supply thermal energy having favorable property free from lowering of temperature, by capsules containing pentaerythritol and an organic heat-transmitting medium immiscible therewith are contained in a high-pressure water tank of a steam accumulator. CONSTITUTION:In the interior of each of the capsules 6, a crystal (particulates) of a latent heat type heat-accumulating material consisting of pentaerythritol is contained in the condition of being immersed in an organic heat-transmitting medium immiscible therewith, e.g., a silicone oil. When accumulating heat, a steam is blown into pressurized water 5 contained in a pressure vessel 3 through nozzles 4, thereby raising the temperature of pressurized water 5. When the temperature of water 5 exceeds 188 deg.C, pentaerythritol undergoes a crystalline transition, so that the quantity of heat accumulated at 188 deg.C is increased. When releasing heat, a controlling valve 2 is opened, whereby pressurized water 5 is evaporated, and steam flows out. When the temperature of water 5 is lowered below 188 deg.C, pentaerythritol is converted into a low-temperature stable phase, and steam of a constant temperature approximate to 188 deg.C is discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat storage device using a steam accumulator.

Currently, steam is used in various factories, but the required steam flow rate usually varies over time. However, boilers that generate steam are more efficient when operated steadily, so these fluctuations can be absorbed and flattened to save energy.
A steam accumulator is used for measuring purposes.

Figure 1lE1 shows a schematic diagram of Kamataru Steam 7 Cumulator, where 1 is the control valve on the inflow side, 2 is the control valve on the outflow side, 3 is the pressure vessel, 4 is the nozzle, and 5 is the pressure water. .

When the steam accumulator having such a structure is busy storing heat, steam is drawn into the pressure water 5 in the pressure vessel 3 through the nozzle 4 from the control valve 1 on the inflow side. The blown steam condenses extremely quickly and releases latent heat, temporarily raising the temperature of the pressure water 5.

Furthermore, when heat is released, the control valve 2 on the outflow side is opened, so that the pressure water 5 evaporates and steam flows out.

In this way, a steam accumulator constitutes a heat storage device that generates water vapor by pressurizing water vapor into a high-pressure water tank, condensing and storing it, and reducing the pressure as necessary. Since it is essentially a sensible heat storage device, its temperature decreases as it is busy releasing heat energy as water vapor.

[However, in order to increase the amount of heat storage and supply high-quality thermal energy without significantly lowering the temperature, it is necessary to increase the size of the pressure vessel 3, which is unavoidable. This was done in consideration of the actual situation.
The present invention uses pentaerythritol as a heat storage material with high heat storage density to provide a heat storage device that can improve heat storage density and supply high-quality thermal energy without lowering the temperature.

Hereinafter, the heat storage device of the present invention will be explained based on FIG. 2.

In this figure, the same symbols as in FIG. 1 indicate the same A geometric parts.

Reference numeral 6 indicates a capsule in which a heat storage material crystal made of penquerythritol is housed together with a fluid that does not dissolve therein.

Pentaerythritol CC (CH20H) is an excellent latent heat storage material that is used as a raw material for resins, cosmetics, explosives, etc., and undergoes crystal transition at 188°C, absorbing and releasing about 280 kJ7 kg of latent heat at this time. Supercooling phenomenon is not often observed.

However, since it is an organic powder, its thermal conductivity is low and good heat transfer characteristics cannot be obtained as it is.

Therefore, we focused on the fact that it has a crystalline structure even in a heat storage state, and mixed it with an organic heat medium that is incompatible with it, and encapsulated it.

The organic heating medium is preferably one that does not change crystal properties and has high specific heat and thermal conductivity, such as silicone oil, diphenyl ether, or (c) hydrocarbon heating medium (
Caloria HT manufactured by Ekunn Co., Ltd., Nippon Steel Chemical Co., Ltd. (Copper Therm-S 1) If soaked in Nippon Oil Co., Ltd. (trade name of High Therm 2 or higher manufactured by Nippon Oil Co., Ltd.) to impart fluidity, effective heat transfer is achieved by natural convection within the capsule. can be made to do so.

As described above, in the heat storage device of the present invention having such a structure, during heat storage, when steam is blown into the pressure water 5 in the pressure vessel 3 from the control valve 1 on the inflow side through the nozzle 4, the blown steam is extremely It rapidly condenses and releases latent heat, raising the temperature of the pressure water 5. Then, the temperature rise of the pressure water 5 is the crystal transition temperature of pentaerythritol (
When the temperature exceeds 188° C.), the heat is transferred to the pentaerythritol crystals (powder) through the wall of the capsule 6 and the fluid heat transfer medium, causing a crystalline transformation of the pentaerythritol. Therefore, the amount of heat storage at 188° C. increases in proportion to the amount of pentaerythritol filled.

Also, by opening the control valve 2 on the outflow side during heat radiation,
Pressure water 5 evaporates and steam flows out, but when the temperature of pressure water 5 drops below 188°C, penquerythritol transforms into a low temperature stable phase and releases heat.

Therefore, the amount of steam generated in the vicinity of 188° C. increases, and since the steam at a constant temperature is released in this vicinity, heat is effectively utilized, and the amount of heat storage also increases.

Figure 3 shows penquerythritol 1 in powder crystal form.
An example is shown in which a capsule 12 is sealed together with the above-mentioned organic heat medium 11.

When encapsulating in the capsule 12, it is preferable to remove oxygen and simultaneously mix and seal a deterioration inhibitor such as a carboxylic acid, a salt thereof, or an ester thereof.

As explained above, in the heat storage device of the present invention, pentaerythritol crystals and an organic heat medium that is incompatible with the pentaerythritol crystals are sealed in a capsule and housed in the high-pressure water tank of the steam accumulator, increasing the heat storage density. 0, which has the advantage of being able to emit high-quality thermal energy without causing a drop in temperature.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a steam accumulator, Figure 2 is a schematic diagram of a steam accumulator containing a capsule showing an embodiment of the heat storage device of the present invention, and Figure 1 is a schematic diagram of a steam accumulator containing a capsule showing an embodiment of the heat storage device of the present invention. A cross-sectional view of the encapsulation is shown. In the figure, 1.2 is a control valve, 3 is a pressure vessel, 4 is a nozzle, and 5
indicates pressure water, and 6 indicates a capsule. Figure 1 Figure 2 Figure 3

Claims (2)

[Claims] (1) A heat storage device characterized in that a capsule filled with pentaerythritol and an organic heat medium that is incompatible with the pentaerythritol is housed in a high-pressure water tank of a steam accumulator. (2) The heat storage device according to claim 11, characterized in that an organic heat medium is mixed with a deterioration inhibitor.