JPH0121279Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention maximizes the hydrogen gas storage and release capacity of hydrogen storage metal over a long period of time by storing and releasing hydrogen gas as fully and quickly as possible. This invention relates to a metal storage container for storing hydrogen.

Hydrogen storage metals have the property of storing hydrogen in the form of metal hydrides, and various uses have been proposed (thermal storage tanks, heat pumps, hydrogen gas purification equipment, etc.), but in any case, hydrogen storage metals have the property of storing hydrogen in the form of metal hydrides. A storage container is required to release it as needed.

Conventionally, this type of storage container has been applied, for example, to a so-called external heat medium channel type as shown in FIG. 1A. 1B is a cross-sectional view of a main part of the hydrogen storage metal storage container portion 2, and FIG. 1C is a cross-sectional view taken along the line C--C in FIG. 1B. In the external heat transfer medium flow path type shown in FIG. It is connected to the header 3 and further connected to the collecting header 3 with a hydrogen gas flow path 4. As shown in FIGS. 1B and 1C, the storage cartridge 2 has a hydrogen gas distribution pipe 6 connected to one axial end of the sealed cylinder 5, and a hydrogen gas distribution pipe 6 installed in the sealed cylinder 5, which is slightly recessed from the end surface of the connection side. Disc-shaped filter 1 made of wire mesh, etc.
0 to form a hydrogen gas chamber 7 between the insertion side end face and the filter 10, and a hydrogen storage metal 8 is filled in a sealed cylinder 5 partitioned by the filter 10.

When exchanging heat (that is, when taking hydrogen in and out), a heating medium is introduced from the inlet 9a and then transferred to the outlet 9a.
While deriving from b, in the storage cartridge 2, hydrogen storage or hydrogen absorption shown as metal + H ₂ → metal hydride or metal hydride → metal + H ₂ is performed, and hydrogen is introduced or discharged accordingly. .

By the way, in the storage cartridge 2,
In order to increase the ability to absorb and release hydrogen gas, the sealed cylinder 5 is formed to be as long as possible, and hydrogen storage metal 8 is filled therein so as to have an even density. It is always taken in and out from the filter 10 side. Therefore, the hydrogen gas storage reaction first occurs on the inlet side (near the filter 10),
As unreacted hydrogen sequentially moves towards the back, the hydrogen storage reaction itself also moves towards the back. However, since the hydrogen storage metal has the property of causing volumetric expansion and decreasing the porosity by storing hydrogen gas, the flow path resistance gradually increases from the inlet side. Therefore, the hydrogen gas pushing pressure to spread hydrogen gas throughout the packed bed needs to increase as the storage reaction progresses.
Since the flow path resistance increases as the occlusion reaction progresses, it is said that hydrogen cannot be sufficiently occluded deep inside.

The present invention was developed with attention to these circumstances, and it is a method for storing and storing hydrogen gas in hydrogen storage metals.
The object of the present invention is to provide a metal storage container for storing hydrogen that allows release to occur as fully and quickly as possible.

The hydrogen storage metal storage container of the present invention, which has achieved the above object, has a plurality of hydrogen storage metal storage chambers and hydrogen gas dispersion chambers each by dividing the inside of the hydrogen storage metal storage container with a filter. The gist is that the hydrogen gas dispersion chambers are formed into sections so as to be adjacent to each other, and a hydrogen gas passage is formed in the storage chamber so that the hydrogen gas dispersion chambers are communicated with each other.

The configuration and effects of the present invention will be explained below with reference to the drawings.

Fig. 2 is a sectional view of a storage cartridge constituting the storage container of the present invention, and Fig. 3 is a -
Line cross-sectional view in the direction of arrows, Fig. 4 shows − in Fig. 2.
In the line cross-sectional view taken in the direction of arrows, inside the sealed cylinder 5 constituting the storage cartridge 2, filters 10, 10 are formed on both end surfaces.
A, a small-volume cylindrical unit storage chamber (hereinafter referred to as a unit cartridge) 2a, 2b, and 2c, which is surrounded by a hydrogen storage metal 8 and is filled with a hydrogen storage metal 8 and has a hydrogen gas passage 13 at its axial center, are coaxially connected to each other. Unit cartridges 2 that store multiple units in one direction and are located adjacent to each other.
A spacer 11 is provided between a, 2b, and 2c, leaving a slight gap, respectively, to form hydrogen gas dispersion chambers 7a, 7b, and the like. Then, the storage cartridge 2 having the above structure is placed inside the outer container 1 in the same manner as shown in FIG. 1A, thereby forming a storage container. In manufacturing the above-mentioned storage cartridge 2, as shown in Fig. 5,
Unit cartridge 2 filled with hydrogen storage metal 8
a etc. are inserted into the sealed cylinder 5 through the spacer 11, and then the sealed cylinder 5 is subjected to a drawing process to bring the unit cartridge 2a and each wall of the sealed cylinder 5 into close contact, thereby achieving heat transfer with the heat medium. Recommended to improve performance. Further, as shown in FIG. 6, the sealing cylinder 5 is placed vertically, one or two cylinders 13a containing spacers 11 are placed against it, and after the hydrogen storage metal is charged, the next filter 10 is placed. If a method of repeatedly assembling is adopted, there is an advantage that a product with even higher heat exchange with the heating medium can be manufactured.

When storing hydrogen, while a refrigerant is flowing into the outer container 1, hydrogen gas is introduced through the collecting header 3 and the distribution pipe 6 and pushed into the storage cartridge 2. The forced hydrogen gas flows from the hydrogen gas dispersion chamber 7 at the inlet to the filter 1 as shown by the arrow in FIG.
Passing through 0, the first unit cartridge 2a
While flowing into the hydrogen storage metal 8 and being stored in the hydrogen storage metal 8,
A portion passes through the hydrogen gas passage 13 to the intermediate hydrogen gas dispersion chamber 7a, further passes through the filter 10, and is stored in the second unit cartridge 26. Part is the first unit cartridge 2a
Since hydrogen is introduced into the first unit cartridge through the rear side of the unit cartridge 2a, hydrogen storage is also performed from the rear of the cartridge 2a, and hydrogen storage in the unit cartridge is performed uniformly in the axial and circumferential directions. be able to. If this is not desired, the filter 10a on the rear side may be replaced with one that does not have transmission performance. Similarly, the third and subsequent unit cartridges 2c also absorb hydrogen evenly.

Although the hydrogen gas dispersion chamber 7a etc. are drawn relatively large in the figure, from the viewpoint of increasing the filling amount of the hydrogen storage metal as much as possible, it is better to make them as small as possible under the condition that the diffusion of hydrogen gas is not inhibited. desirable. Although the hydrogen gas passage 13 has a considerably smaller cross-sectional area than the filters 10 and 10a, the resistance here is extremely small, so that the hydrogen gas can smoothly flow into the inner part of the cartridge.

The basic structure of the present invention is as described above, but other embodiments are shown, for example, in FIGS. 7 and 8 (a sectional view of the storage cartridge 2 corresponding to FIG. 3). That is, in FIG. 7, the unit cartridge 2
A plurality of heat transfer plates 14 are arranged in the hydrogen storage metal storage chamber c, and these are joined to the inner circumferential wall of the unit cartridge 2c, and the heat transfer promoting effect of the heat transfer plates 14 is used to transfer the hydrogen storage metal. This ensures efficient heating and cooling by the heat medium. Next, in FIG. 8, a curved heat transfer plate 14a is used in place of the heat transfer plate 14 in FIG. I'm trying to get it.

The present invention is configured as described above, and can obtain the effects as summarized below.

(1) Hydrogen storage metal is filled in parts, so
The individual filling thicknesses seen in the direction of hydrogen gas flow are much smaller than in the past, making it possible to easily and sufficiently flow hydrogen gas. Therefore, even if the flow path resistance increases due to hydrogen storage in the upstream filled hydrogen gas layer, a sufficient flow rate is still ensured, and no problem occurs in supplying hydrogen to the downstream side.

(2) Since the divided hydrogen storage metal packed beds are communicated with each other by the hydrogen gas passageway and the hydrogen gas distribution chamber, hydrogen can be quickly and sufficiently supplied to all the hydrogen storage metal packed beds including the inner part. Gas can be introduced. Therefore, not only hydrogen storage but also hydrogen release operations can be performed efficiently.

[Brief explanation of drawings]

1A to 1C are cross-sectional views showing a conventional external heat medium flow path storage container, where A is a vertical cross-sectional view of the main part, B is a cross-sectional view of the main part of a storage cartridge, and C is a cross-sectional view of the main part of the storage cartridge.
2 is a cross-sectional view of the storage cartridge according to the present invention; FIG. 3 is a cross-sectional view taken along the line - in FIG. 2; FIG. 4 is a cross-sectional view taken along the line - in FIG. 2; The figure is a state diagram of the storage cartridge according to the present invention before drawing processing, Figures 6 to 8 are sectional views showing embodiments of the storage cartridge according to the present invention, Figure 6 is a view corresponding to Figure 2, Figures 7 and 8 are The figure is a diagram equivalent to Figure 3. 1... Outer container, 2... Storage cartridge (storage container), 2a, 2b, 2c... Unit cartridge (storage chamber), 7, 7a, 7b... Hydrogen gas dispersion chamber,
8...Hydrogen storage metal, 10, 10a...Filter, 13...Hydrogen gas passage.

Claims (1)

[Scope of utility model registration request] By dividing the inside of the hydrogen storage metal storage container with a filter, a plurality of hydrogen storage metal storage chambers and a plurality of hydrogen gas dispersion chambers are adjacent to each other, and the storage chamber has a hydrogen gas passage. A metal storage container for hydrogen storage, characterized in that the hydrogen gas dispersion chambers are interconnected by forming a channel.