JPS58182087A - Heat accumulating device by metal hydride - Google Patents

Abstract

PURPOSE:To speed up the heat transfer to both ends of a heat pipe and consequently obtain high heat exchange rate even in the heat pipe, which is doughnut-shape as a vessel for metal hydride and the length of which is far longer as compared to its diameter, by a structure wherein a heat exchanger is installed in contact with the outer periphery at the almost middle of the longitudinal length of the heat pipe. CONSTITUTION:In order to accumulate heat, heat energy is transferred from heat transfer medium 23 through the heat pipe to metal hydride 13 in order to heat the hydride 18. Hydrogen gas released from the heated hydride is led through a porous conduit 21, a hydrogen entry conduit 20 and a control valve 19 to hydrogen cylinder or the like in order to be stored. In order to release heat, hydrogen gas is sent from said hydrogen cylinder or the like through the control valve 19, the hydrogen entry conduit 20 and the porous conduit 21 to the metal hydride 18 in order to bring the H2 gas into contact and react with the metal hydride 18. In the titled heat accumulating device, because the metal hydride 18 contact with the central hollow inside of the heat pipe and yet the heat exchanger 22 is installed at the middle of the outer tube 14 of the heat pipe, heat can be transferred in both front and rear directions by means of the heat pipe, resulting in enabling to efficiently transfer the heat supplied from the heat transfer medium 23 to the metal hydride 18 or the heat generated from the metal hydride 18 to the heat transfer medium 23.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat storage device using metal hydrides.
Details L-(The central openings at both ends of the donut-shaped heat pipe are closed, and the closing member is equipped with a hydrogen inlet/output conduit with an on/off valve.) A heat vibrator is attached to the outer periphery of the approximately central portion in the longitudinal direction of the metal hydride container. The present invention relates to a metal hydride heat storage device that is connected to each other, and a heat storage device that includes a plurality of metal hydride containers, a heat insulating body into which they can be inserted and supported, a heat exchanger, a hydrogen gas distributor, and a hydrogen gas storage tank.

-1), i. In recent years, metal hydrides have been developed as hydrogen storage materials because they have the property of reversibly absorbing and releasing large amounts of hydrogen.
, → is attracting attention, and its use as a heat storage material is also attracting attention because of the large reaction heat generated during hydrogen absorption and release. In a heat storage device or a hydrogen storage device that uses a metal hydride, it is important to allow the metal hydride to efficiently absorb heat and to efficiently extract heat generated from the metal hydride.

Problems with the equipment using metal hydrides as described above include (a) When metal hydrides are repeatedly hydrogenated and dehydrogenated, they tend to become pulverized and the volume of the packed bed decreases;
(b) Metal hydrides themselves have low thermal conductivity, which is disadvantageous in terms of heat transfer (transfer of reaction heat).

In order to solve the above problem, the inventors of the present invention have already developed a metal hydride container in which the central openings at both ends of a donut-shaped heat pipe are closed and a hydrogen inlet/outlet conduit with an on-off valve is provided in the closing member. At the end of the heat pipe on the closing member side where the hydrogen inlet/output conduit is not installed, a metal hydride heat storage device connected to a heat exchanger, a plurality of cylinders of the metal oxide container, and a heat insulating body capable of inserting and supporting these. A heat storage device comprising a heat exchanger, a hydrogen gas distributor, and a hydrogen gas storage tank is disclosed in Japanese Patent Application No. 145601/1983.

FIG. 1 shows a longitudinal cross-sectional view of an embodiment of a heat storage device using one of the metal hydride containers described above.

(1) and (2) are the outer W and inner pipe of the donut-shaped heat pipe, respectively, and (3) is the wick, the hollow part of which is filled with an appropriate amount of working fluid. The openings at both ends of this donut-shaped heat pipe are closed by closing plates (4a, 4
b), and a hydrogen inlet/output conduit (8) having an on-off valve (7) is attached to the closing plate (4a), and furthermore, the hydrogen inlet/outlet conduit (8) is attached to the closing plate (4a) from the section to the closing plate (4a). Hydrogen passes through the central hollow part (5) of the heat pipe, but metal hydrides cannot pass through it.For example, a porous conduit (91) made of sintered alloy with a closed end is extended, and the central hollow part (5) is filled with metal hydride (6).In addition, there is a heat exchanger (0) at the end of the donut-shaped heat pipe.
0 is connected to the heat exchanger, this heat exchanger is filled with a heat medium an, and has an inlet/outlet conduit (12a, 12b) for 1 μl of the heat medium. Furthermore, the metal hydride container is covered with a heat insulating material αJ. This heat storage device has little heat loss to the pressure container, and the large contact between the heat pipe and the metal hydride makes it possible to exchange cells effectively.

In this device, in order to further increase the contact area between the metal hydride powder and the inner tube of the heat pipe, and to reduce the influence of swelling due to pulverization due to hydrogen absorption and release of the metal hydride, it is necessary to The layer needs to be thin. In other words, the length of the donut-shaped heat pipe must be made longer than its diameter.

4-j It takes time for heat transfer between the metal hydride layers packed in the vicinity of the closing plate (4a) on the opposite side from the end, and the energy exchange rate decreases.

t, - This invention relates to improvement of the above heat storage device,
The central hollow part of the doughnut-shaped heat pipe is filled with metal hydride, and the central openings at both ends of the central hollow part are closed by closing members, and the closing member has an on-off valve. The heat pipe is installed so that the heat pipe is connected to the central hollow part of the pipe through a partition through which the hydride cannot pass through. The present invention provides a metal hydride heat storage device in which a heat exchanger is connected to enable heat exchange between a working fluid and another fluid.

The device of this invention is characterized in that the heat exchanger is connected to the outer periphery of the heat pipe at approximately the center in the longitudinal direction, and since heat is transferred from the center of the heat pipe, the metal hydride Even if the donut-shaped heat pipe of the container has a long shape relative to its diameter, heat is quickly transferred to both ends of the heat pipe and a high heat exchange rate can be achieved.

FIG. 2 shows a longitudinal section of one embodiment of the heat storage device.
α9 is the outer tube and inner tube of the donut-shaped heat pipe, αG is the wick, (17a) and (17b) are the closing plates of the nut-shaped heat vibrator, and σ is the metal hydride.
! ll is an on-off valve, group is a hydrogen inlet/output conduit, 5 is a porous conduit, (2) is a heat exchanger, heating is a heating medium, (24a) (24b
) is a heat medium inlet/outlet conduit, ■ is a heat exchange fin, c! BJ indicates a heat insulating material. This heat storage device performs heat exchange as follows.

During heat storage, thermal energy is transferred from the heating medium to the metal hydride container to heat the metal hydride mark U through the heat pipe, and the generated hydrogen gas is passed through the porous conduit c1.
11, the hydrogen is filtered, and then passed through a hydrogen inlet/outlet conduit plate and an on/off valve decoy, and then led to a hydrogen cylinder or the like (not shown) and stored.

During heat dissipation, hydrogen gas from a hydrogen cylinder, etc. passes through an on-off valve and a hydrogen inlet/output conduit, passes through a porous conduit (211), contacts the metal hydride α barrel, and reacts.The generated heat is transferred to heat exchanger H through a heat pipe. , heats the heat medium and utilizes this heat.

In this heat storage device, the metal hydride stopper is in contact with the central hollow inner surface of the heat pipe, and the heat exchanger is the outer tube α4 of the heat pipe.
Because it is installed in the center of the heat pipe, it is possible to transfer heat in both the directions of arrows A and B, and the heat generated when F is supplied to the heat medium is efficiently transferred to the heat medium. (The direction of heat transfer in this case is A.

(The arrows are in opposite directions for both directions B). Furthermore, the influence of swelling caused by pulverization of the metal hydride can be minimized.

From another point of view, the present invention is characterized in that the central hollow part of a donut-shaped heat pipe is filled with a metal hydride, the central openings at both ends of the central hollow part are closed by a closing member, and the closing member has an on-off valve. a plurality of metal hydride pipes installed so as to communicate with the central hollow portion of the heat pipe through a partition that allows hydrogen to pass through but not the metal hydride; A heat insulating body having a rectangular parallelepiped shape and having horizontal grooves arranged in parallel on one side thereof into which these metal hydride containers can be inserted and supported, a heat insulating cover for the opening of these horizontal grooves, a heat insulating body and a heat insulating cover. A heat exchanger is attached to the body and is located around the outer periphery of the heat pipe at approximately the center in the longitudinal direction of each metal hydride container, which enables heat exchange between the working fluid of the heat pipe and other fluids, and a heat exchanger that enables heat exchange between the working fluid of the heat pipe and other fluids. The present invention provides a metal hydride heat storage device comprising a hydrogen gas distributor and a hydrogen gas storage tank connected to an inlet/outlet part.

1. An example of which heat storage device is shown in Figure 1@8. This heat storage device uses eight metal hydride containers (using doughnut-shaped heat pipes) of a certain diameter and length, and (27a), (27b), and (27c) are metal hydride containers @ are the insulation main body, (29a), (29b),
(29c), t29d) are on-off valves, <5Oa), (8
0b), (80c) are joints, (31) is a water volume distributor, the older sister is a hydrogen storage tank, (88a) (8!Ib) are heat medium inlet/output conduits, ta4a), (84b), (84c) are metal The heat exchanger section of the hydride container, - represents the heat exchanger, respectively. This heat storage device performs heat exchange 8- as follows. During heat storage, the heated heat medium is guided from the heat medium inlet of (88b) to the heat exchanger, and the heat exchanger part (84a) protrudes into the heat exchanger of the metal hydride container.
, (84b entered (84c)'t-by heating,
The metal hydride in the metal hydride containers (27a) (27b) (27c) is heated. Open/close valves (29a), (29b), (29c), (29d) for generating hydrogen gas
Hydrogen is generated through The generated heat is transferred to the heat medium through the heat exchange parts caaa), (84b), and (84c) of the metal hydride container, and is used as a heat source for heating, cooling, and hot water supply, for example.

This heat storage device uses a plurality of metal hydride containers of the heat storage device shown in FIG. 2, which have a highly efficient heat exchange function. Therefore, highly efficient heat exchange is possible, and not only can the capacity of F heat storage (heat storage scale) be easily changed by increasing or decreasing the number of metal hydride containers, but each metal hydride container can be It is a high-performance heat storage device that has the advantage of being able to be handled independently of the container.

[Brief explanation of drawings]

Figure 1 was published in Japanese Patent Application Laid-Open No. 56-1456
01, FIG. 2 is a vertical cross-sectional view of an embodiment of a metal hydride container used in the heat storage device of the present invention, and FIG. 8 is a longitudinal sectional view of an embodiment of the heat storage device of the present invention. FIG. 2 is a perspective view including a partial cross-sectional view illustrating the internal structure of the device. (1) α leakage: outer tube of donut-shaped heat pipe, (2
) (to)...Tube, till f211-...Porous conduit, rmr22Im-...Heat exchanger, l1llq...
・Heat medium, (12a) (12b) (24a) (24b
) (88a) (88b)... Heat medium inlet/output conduit, 03 (to)... Insulating material, (c)... Heat exchange fin, (27
a) (27b) (27c) - Metal hydride container, @
...insulation body, (80a) [80b) (80c) -
Connection part, 131)...Hydrogen distributor, 02...Hydrogen storage tank, and (84a) (84b) (84c)...
・Heat exchange part of metal hydride container.

Claims (1)

[Claims] 1. The central hollow part of the donut-shaped heat pipe is filled with a metal hydride, and the center openings at both ends of the central hollow part are closed by a closing member, and the closing member has a hydrogen inlet/outlet valve having an on-off valve. At the outer periphery of the heat vibrator at approximately the center in the longitudinal direction of the metal hydride container installed so as to communicate with the central hollow part of the heat pipe through a conduit through which hydrogen can pass but metal hydride cannot pass through a partition, A metal hydride heat storage device connected to a heat exchanger that enables heat exchange between the working fluid of the heat pipe and other fluids. 2. The central hollow part of the doughnut-shaped heat pipe is filled with metal hydride, and the center openings at both ends of the central hollow part are closed with closing members, and the closing member has a hydrogen inlet/outlet conduit having an on-off valve, through which hydrogen passes. A plurality of metal hydride containers are installed so as to communicate with the central hollow part of the heat pipe through partitions that cannot pass the metal hydride. a heat insulating body formed by horizontal grooves arranged side by side into which chemical containers can be inserted and supported;
A heat insulating cover for the opening of these horizontal grooves, a heat insulating body, and a heat insulating cover are attached to the heat insulating body and the heat insulating cover, and the heat pipe working fluid and other fluids are connected to the outer periphery of the heat pipe in the longitudinal direction of each metal hydride container. A metal hydride heat storage device comprising a heat exchanger that enables heat exchange, a hydrogen gas distributor and a hydrogen gas storage tank connected to a hydrogen inlet/outlet of each metal hydride container.