JPS6159192A - Heat accumulator - Google Patents

Abstract

PURPOSE:To minimize the heat losses and to increase the heat accumulating speed, by housing a metal hydride, heat pipes and a filter in a pressure hydrogen container having a heat insulating material. CONSTITUTION:When heat is to be accumulated, a high-temperature heating medium is admitted from a heating medium inlet conduit 9 into a heat exchange jacket 7. The heat of this heating medium is taken via a heat pipe 5 into a container 1, and is transmitted via heat transmitting fins 6 to a metal hydride 3. As a result, the metal hydride 3 releases hydrogen, and the hydrogen is taken outside via a metal sintered filter 4 in the container, a manifold 11 and a hydrogen inflow/outflow conduit 12 and is stored. On the other hand, when radiation is to be carried out, reversely the hydrogen stored outside is released into the container via the hydrogen inflow/outflow conduit 12, the manifold 11 and the metal sintered filter 4. The heat released when the hydrogen combines with the metal hydride 3 is transmitted from the fins 6 to the heat pipe 5, is recovered by the heating medium flowing through the heat exchange jacket 7 and taken outside via a heating medium outlet conduit 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heat storage device using a metal hydride, and particularly to a heat storage device with good thermal efficiency.

Prior Art Various metals and alloys are known to absorb hydrogen in the form of metal hydrides at a density equal to or higher than that of liquid hydrogen, and are expected to be used as hydrogen storage materials for storing hydrogen as clean energy. .

Moreover, such metal hydrides not only have the characteristic of simply storing hydrogen, but also have an energy conversion function of converting the chemical energy of hydrogen into heat or mechanical energy.

Regarding heat storage that utilizes the mutual conversion function of chemical energy and thermal energy, it is expected to be a new heat storage material because it can store much more heat per unit volume than conventional heat storage materials that store sensible heat or latent heat. has been done.

Technology to use metal hydrides as energy conversion materials is currently under development, and many attempts have been made (for example, heat pumps).

chemical compressors, heat storage, heat transport, etc.). Regarding heat storage technology (heat storage), various container structures have been proposed for the purpose of effectively utilizing the reaction heat of metal hydrides (Japanese Patent Publication No. 59-1950, JP-A No. 56-1
45602 etc.). However, in these containers, heat loss of the pressure container constituting the metal hydride,
In addition, rapid heat conduction and rapid hydrogen supply to metal hydrides are major issues.

In other words, since metal hydrides undergo reactions under hydrogen pressure, the container filled with metal hydrides needs to have a pressure-resistant structure, which increases the weight of the container.6 Therefore, when storing or dissipating heat, the entire container must be The amount of heat required for heating can no longer be ignored.

As a result, the amount of heat flowing into the pressure container has a large effect on heat storage efficiency. Therefore, in order to improve heat storage efficiency, it is necessary to reduce heat loss due to the pressure-resistant container as much as possible.

In addition, the reaction between metal hydride and hydrogen (which occurs more quickly, so a large heat storage and heat release rate can be expected, but in order to achieve this, it is necessary to increase the heat transfer rate within the powdered metal hydride layer as much as possible). At the same time, it is necessary to smoothly supply and extract hydrogen.

Purpose The present invention was made in view of the above points, and an object of the present invention is to provide a heat storage device with low heat loss and high heat storage rate.

Structure Therefore, in the present invention, a plurality of heat pipes and a plurality of metal sintered filter cylindrical bodies are housed together with a metal hydride in a cylindrical pressure-resistant hydrogen container with a heat insulating material attached to the inner wall. is arranged to airtightly penetrate one end of the pressure-resistant hydrogen container and extend from the inside of the container to the outside, and fan-shaped heat transfer fins are fixed at predetermined intervals to the heat pipe portion existing inside the container, forming a layered circular fin as a whole. At the same time, a heat exchange jacket is attached to each of the heat pipes existing outside the container, and the structure is such that the heat medium is continuously passed through the conduit in series, while the metal sintered filter is attached to each heat pipe. It is characterized in that it is arranged between the fan-shaped heat transfer fins fixed to the fins, and is connected to a manifold and connected to an external hydrogen inlet/output pipe from the other end of the pressure-resistant hydrogen container to constitute a heat storage device. .

EXAMPLE An example of the present invention will be described below with reference to the drawings. still,
Metal hydrides are dehydrogenated by heat and become metals,
In this specification, this case is also collectively referred to as metal hydride.6 FIG. 1 shows a cross-sectional view of a heat storage device according to an embodiment of the present invention, and FIG. -A cross-sectional view is shown.

In these figures, the inner wall of a cylindrical pressure-resistant hydrogen container 1 made of stainless steel, for example, is entirely covered with a heat insulating material 2, and inside it there is a metal hydride 3, a metal sintered filter 4, and a container. A heat pipe 5 is hermetically sealed through the end surface of 1.

In the case of one heat pipe 5 in this embodiment, there are four in total, and the part of each heat pipe 5 sealed inside the container 1 is not shown in the middle in FIG. 1, but it is shown in FIG. As shown, a plurality of fan-shaped heat transfer fins 6 are fixed at predetermined intervals. The heat transfer fins 6 are made of, for example, an aluminum plate to reduce weight.

A layered circular fin is formed by a bundle of four fins. Also.

A heat exchange jacket 7 is attached to a portion of the heat pipe 5 that protrudes from the container 1. The front and rear ends of these four heat exchange jackets 7 are connected by conduits 8 so that the heat medium can flow in series. Furthermore, the 2N heat exchange jacket 7 connected in series
A heat medium inlet conduit 9 and a heat medium outlet conduit 10 are attached to the frontmost end and the rearmost end.

On the other hand, the metal sintered filter 4 is a small-diameter cylindrical filter made of stainless steel, for example, and has a grooved structure that allows hydrogen to pass through but not the metal hydride 3. This metal sintered filter 4 is branched from the manifold 11, and as shown in FIG. Five are arranged.

Further, a hydrogen inlet/outlet conduit 12 for discharging hydrogen protruding outward from the end face IB of the container 1 is connected to the manifold 11, and an enlarged view of this portion is shown in FIG. 4.

With such a configuration, during heat storage, a high temperature heat medium flows through the heat medium inlet conduit 9.
from the heat exchange jacket 7. The heat of this heating medium is taken into the container 1 via the heat pipe 5 and further transferred to the metal hydride 3 via the heat transfer fins 6. As a result, the metal hydride 3 releases hydrogen, which is taken out from the metal sintered filter 4 disposed inside the container 1 through the manifold 11 and further through the hydrogen inlet/output conduit 12 and stored. On the other hand, during heat dissipation, on the contrary, hydrogen stored outside is released into the container 1 from the hydrogen inlet/output pipe 12 via the manifold 11 and the metal sintered filter 4. The heat generated when this hydrogen combines with the metal hydride 3 is transferred from the heat transfer fins 6 to the heat pipe 5, recovered by the heat medium flowing through the heat exchange jacket 7, and taken out to the outside through the heat medium outlet conduit 10.

At this time, since the metal hydride 3 is placed between the heat transfer fins 6, it can be positioned at an extremely short distance from the heat transfer surface of the heat transfer fins 6, and rapid heat conduction is possible. Further, the heat supplied to the metal hydride 3 or the heat generated in the metal hydride 3 is blocked by the heat insulating material 2 and does not reach the pressure-resistant hydrogen container 1, so that high heat storage efficiency can be obtained.

In addition, hydrogen is supplied and taken out using a metal sintered filter 4,
Since this is carried out via the manifold 11 and the hydrogen inlet/output conduit 12, hydrogen is uniformly supplied to and withdrawn from the metal hydride 3, so that the flow of hydrogen is not obstructed.

In addition, the heat pipe 5 absorbs heat from the metal hydride 3,
Since heat is dissipated, there is no dirt or corrosion on the inner tube of the heat transfer tube, and since heat transfer by the steam of the working fluid is used, it is excellent in long-distance heat transport.

Furthermore, since the heat exchange jackets 7 attached to the heat pipes 5 are connected in series, the flow rate of the heat medium on the heat transfer surface can be increased, and efficient heat exchange can be performed without stagnation of the heat medium. .

Effects As explained above, according to the present invention, since a heat insulating material is attached to the inner wall of the pressure-resistant hydrogen container, it is possible to prevent the amount of heat from flowing into the pressure-resistant hydrogen container, thereby improving heat loss. Since the fan-shaped heat transfer fins are arranged at predetermined intervals within the metal hydride layer, the heat transfer rate can be extremely increased. Since the hydrogen inlet/output pipe is connected to the metal sintered filter via the manifold, hydrogen can be smoothly supplied to and taken out of the metal hydride. Since a heat pipe is used as the heat transfer tube, effects such as long-distance heat transport can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is a sectional view showing an embodiment of the present invention;
3 is a perspective view showing how the heat pipe and fan-shaped fins are attached, and FIG. 4 is an enlarged view showing the manifold section in detail. 1...Pressure-resistant hydrogen container, 2...Insulating material, 3...Metal hydride, 4...Metal sintered filter, 5...Heat pipe, 6...Heat transfer fin, 7... Heat exchange jacket, 8... Conduit, 9... Heat medium inlet conduit, 10...
・Heat medium outlet conduit, 11...manifold pipe, 12...hydrogen in/out conduit.

Claims (1)

[Claims] A cylindrical pressure-resistant hydrogen container whose inner wall is covered with a heat insulating material, a metal hydride stored in the pressure-resistant hydrogen container, and a container that airtightly penetrates one end of the pressure-resistant hydrogen container and extends from the inside of the container to the outside. A fan-shaped heat transfer system consisting of a plurality of heat pipes and a plurality of fan-shaped heat transfer sheets made of a lightweight and highly thermally conductive material that are fixed at predetermined intervals to the parts of these heat pipes that are placed inside the container, and that form a layered circular fin as a whole. fin and
a plurality of heat exchange jackets each attached to a portion of the heat pipe disposed outside the container and connected in series through a heat medium flow conduit; and a heat transfer provided for each heat pipe inside the pressure-resistant hydrogen container. A plurality of metal sintered filter cylinders disposed between the fins, a manifold pipe connecting these metal sintered filter cylinders, and a manifold connected to the manifold and airtightly passing through the other end of the pressure-resistant hydrogen container. and a hydrogen inlet/output conduit protruding from the outside.