JPS60188697A - Heat radiating vessel for alloy absorbing and storing hydrogen - Google Patents

Abstract

PURPOSE:To improve the heat transfer rate of a heat radiating vessel for an alloy absorbing and storing hydrogen, by providing a plurality of holed separator plates in a direction crossing at a right angle with a flow path of hydrogen in the vessel so as to form small chambers and dividing these small chambers further into small chambers by elastic fins. CONSTITUTION:A vessel 1 comprises external fins 2, caps 3, 4 and a hydrogen flow pipe 5, and the cap 4 and the flow pipe 5 are mounted after setting holed separator plates 6, internal fins 7 and absorbing and storing alloys 8 to be inserted into the vessel. The internal fin, having elasticity in itself and as a set of fins so as to be closely attached to an internal wall of the vessel, divides the inside of a pipe of the vessel 1 into small chambers in the radial direction. Accordingly, the vessel results to improve its heat transfer rate because the numerous small chambers are formed by simplified construction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat transfer container for a hydrogen storage alloy, and relates to the container which can alleviate excessive stress concentration on the container wall, improve heat transfer coefficient, and is easy to manufacture and maintain. be.

Containers for hydrogen-absorbing alloys (hereinafter referred to as alloys) must have the ability to cool the alloy during hydrogen storage and heat it during desorption, but because the alloy is a powder, the thermal conductivity of the alloy layer is extremely low. It is small and slows down the heat transfer for cooling and heating.

Therefore, it is necessary to increase the heat transfer area between the container and the cooling or heating medium, and fins or the like are provided on the heat transfer surface of the container.

In the present invention, the alloy container is formed of a tube, and fins are provided on the outside of the tube, and at the same time, perforated partition plates and fins are also provided on the alloy layer inside the tube, thereby increasing the heat transfer area and facilitating the retention of the alloy powder. This is what we are trying to do. .

By the way, alloys have the property of expanding when hydrogen is absorbed and contracting when hydrogen is removed, and repeated expansion and removal may generate excessive stress in the container member.

As a countermeasure, generally, a void is provided inside the container to allow for expansion, and the container is divided into small chambers to prevent the scattering and movement of the alloy powder, and to prevent expansion lumps when absorbing hydrogen, thereby dispersing stress. I'm taking measurements.

The present invention provides an alloy container in which the interior of the container is divided into small chambers using elastic fins, and at the same time the heat transfer coefficient is improved, and the container manufacturing and alloy filling operations are facilitated. .

That is, the present invention provides a heat transfer container in which a hydrogen storage alloy is loaded, in which a hydrogen flow path is provided in the axial direction of the container, and a plurality of perforated partition plates are provided in a direction perpendicular to the direction of the flow path. The present invention relates to a heat transfer container for a hydrogen storage alloy, characterized in that the container is divided into small chambers, and elastic internal fins are provided to further divide the inside of the container small chamber into small chambers in the radial direction.

FIG. 1 is a diagram showing an embodiment of the container of the present invention.

In the figure, a container 1 has external fins 2. Lid 3゜4 and hydrogen, conduit 5 and lid 3 or lid 4 and conduit 5,
Perforated partition plate6. It is installed after loading the internal fins 7 and storage alloy 8 into the container.

The filling procedure includes, for example, container 1. After manufacturing the external fins 2 and the lid 3, first, the perforated partition plate 6a is inserted, and then the internal fins 7a are inserted. Then, a predetermined amount of granular alloy 8a is weighed and filled. Next, the perforated partition plate 6b is charged, the internal fins and the alloy are sequentially charged, and finally the lid 4 and the conduit 5 are charged.
Install.

By sequentially charging the items into the container in this manner, the alloy 8 can be easily uniformly dispersed throughout the container 1.

Hydrogen is a conduit5. Hydrogen passes through the perforated partition plate 6, comes into contact with the alloy 8, and generates a phenomenon of occlusion or dissociation with the alloy in relation to the exchange of heat with the outside or the pressure of hydrogen itself.

On the other hand, Alloy 8 generates heat and expands when it absorbs hydrogen, and endothermically contracts when it dissociates.

Therefore, the container 1 needs to smoothly transfer heat to and from the alloy 8 and at the same time avoid generating excessive stress due to expansion and contraction of the alloy 8.

Generally, in cases where an alloy is placed inside the tube and a heating medium is placed outside the tube, such as in this case, the heating medium outside the tube is a gas or liquid.
Since a material with excellent thermal conductivity is used and external fins are provided, the heat transfer coefficient on the outside of the tube is extremely high. On the other hand, the inside of the tube is made of alloy powder and the voids are made large to avoid expansion and contraction of the alloy, and the heat transfer coefficient is extremely low.

In contrast, the container of the present invention can provide the following effects.

(1) Regarding the expansion and contraction of the alloy, approximately 5
A void of 0% is provided to prevent excessive stress on the container wall.

(2) Furthermore, divide the container into small chambers to avoid stress concentration.

(3) A perforated partition plate 6 is arranged in the partition dividing the small chambers in the direction of hydrogen flow to prevent Alloy 8 powder from moving to the adjacent small chamber when hydrogen passes through.

(4) Furthermore, internal fins 7 are provided in the radial direction of the container to prevent movement in the circumferential direction.

(5) Here, the internal fins 7 not only function as partitions but also have the effect of improving the heat transfer coefficient inside the container.

The present invention provides such a heat transfer container. (1) A perforated partition plate is provided in the hydrogen passage direction (axial direction of the heat transfer tube) to allow hydrogen to flow, and to prevent scattering of alloy powder. New ideas include: preventing movement and dividing the container into small chambers; ■ installing elastic internal fins inside the heat transfer tube to improve the heat transfer coefficient within the tube; and dividing the container into small chambers. It is a point.

In addition, in the container of the present invention, the internal perforated partition plate may be made of a porous material in addition to foam metal, sintered metal, wire mesh laminate, etc.
Depending on the temperature and pressure, inorganic (ceramics) or organic materials can also be used. The appropriate distance between the partition plates is 0.3 to 15 times the diameter of the heat transfer tube.

In addition, the internal fins themselves and a set of fins are configured to have elasticity so as to be in close contact with the container wall. Stainless steel materials, steel materials,
There are aluminum materials. The shape of the internal fins is shown in Figure 2 (a
It is preferable that the tube 1 can be divided into small chambers as shown in ), and it is appropriate that the tube can be divided into 2 to 60 chambers in cross section.

Alloy 8 is preferably uniformly filled in each chamber,
Normal filling rate is 50±30%.

Furthermore, the internal fins are made by bundling the folded plate-like fins 9 in the direction of the arrow 10 as shown in FIG. 2(C).
Alternatively, fold the fin plate 11 as shown in Figure 2 ((11), wrap it in the direction of the arrow 12, and
It can also be configured as shown in Figure 1ll). In addition to these, a structure made of wavy fins 13 as shown in FIG. The heat transfer area of the fins can also be improved.

Note that the internal fins themselves are required to have high adhesion to the inner wall of the pipe. This is to prevent the movement of alloy powder grains and improve the heat transfer coefficient, but for this purpose, the fins themselves need to have elasticity, as shown in Figure 2 (' b)～
In the example of (e), the fins 9 or 11 are made somewhat larger than the tube when charging the tube, and as shown in FIG. It is also possible to adopt a structure in which consideration is given to not impairing the adhesion even if the size increases.

Below, the effects of the present invention will be listed in comparison with the case where there is no perforated partition plate and internal fin according to the present invention.

(1) Concerning concentration of excessive stress on the container wall: In the absence of partitions, fins, etc., in a normal tubular container, the alloy expands and contracts repeatedly, causing the wall to bulge outward and break. In order to prevent this, it is necessary to increase the thickness of the container wall, but in the case of the present invention, even if the container wall thickness is reduced, the container will not be destroyed.

(2) In the case of the present invention, it is possible to prevent the alloy from scattering, and maintenance of downstream instruments, etc. is easy, and the lifespan is extended.

(3) The heat transfer coefficient is improved several times to several tens of times compared to the alloy itself.

(4) Providing elasticity to the internal fins facilitates production and assembly.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an example of an embodiment of the container of the present invention, and Fig. 2 (
a) to (a) are diagrams showing examples of the structure of internal fins according to the present invention. Sub-agents 1) Clear agent Ryo Hagiwara -

Claims (1)

[Claims] In a heat transfer container in which a hydrogen storage alloy is loaded, a hydrogen flow path is provided in the axial direction of the container, and a plurality of perforated partition plates are provided in a direction perpendicular to the flow path direction to divide the inside of the container into small chambers. A heat transfer container for a hydrogen storage alloy, characterized in that the inside of the small chamber of the container is further divided into small chambers in the radial direction by providing internal fins having elasticity.