JPS593001A - Reactor for metallic hydride - Google Patents

Abstract

PURPOSE:To stably carry out the occlusion and release of gaseous hydrogen by arranging many small tubes permeable to gaseous hydrogen and many heat medium tubes in a tightly sealed container filled with metallic hydride in a uniformly distributed state. CONSTITUTION:Many tubes 8 permeable to gaseous hydrogen, having 2-20mm. inside diameter and made of synthetic resin having many micropores of 1-5mum size, a sintered metallic body or the like are arranged in a tightly sealed container 1, and many heat transfer medium tubes 9 having >=2mm. inside diameter and made of an elastic and flexible material such as polyethylene or fluororesin are also arranged in the container 1. The space among the tubes 8, 9 in the container 1 is filled with powdered metallic hydride 10. When gaseous hydrogen is occluded and realsed using the apparatus, the hydrogen occluding and releasing reactions of the metallic hydride 10 are accelerated, and the tubes 8, 9 are not damaged by the cubic expansion and shrinkage and can be used for a long term because the tubes 8, 9 are distributed alternately and uniformly in the metallic hydride 10 and are flexible.

Description

[Detailed description of the invention] The present invention relates to metal hydride reactors.

It is known that certain metals and alloys reversibly absorb and release hydrogen. Hydrogen storage is an exothermic reaction.1. Hydrogen release is an endothermic reaction. Heat pumps, hydrogen storage devices, hydrogen purification devices, etc. that utilize the characteristics of metal hydrides,
Chemical engines etc. #! There are dormitories.

In these metal hydride devices, the metal hydride undergoes a hydrogen absorption/desorption reaction in a closed container, but the reaction rate is regulated by hydrogen diffusion and heat conduction. The metal hydride expands and contracts in the hydrogen storage device, becomes a fine powder, and is densely packed, allowing hydrogen to flow smoothly into the metal hydride layer and improving heat conduction in the metal hydride layer to make it a fine powder. There was a problem that the value decreased.

In order to solve the above problems, the inventor has requested a practical application Ivl.
As shown in No. 156-40879, a metal hydride reactor was proposed in which heat transfer fins were provided inside a tubular container and a porous tube for hydrogen diffusion was provided in the center. The heat transfer fins improve heat transfer, but the amount of metal hydride filled is limited, and the heat capacity of the heat transfer twin is limited. However, the conditions were said to be disadvantageous for heat pumps, etc.

The present inventor has proposed that the heat transfer between the metal hydride and the heating medium is not carried out through the container wall of the filled container, but by arranging a heating medium group consisting of a large number of elements in the metal hydride layer. In addition, I thought about forming a hydrogen flow path with a large group of permeable bodies so that hydrogen could flow even if the permeable body for hydrogen flow was not crushed or partially crushed. made an invention.

The gist of the present invention is to provide a hydrogen permeable body that is filled with a metal hydride inside a closed container, and includes a group of heat medium tubes consisting of a large number of thin tubes, and a permeable body that permeates hydrogen but does not permeate the metal hydride. The metal hydride reactor is characterized in that the group is located within the metal hydride layer.

An example of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a closed container, which has a substantially cylindrical cross section and is sealed at both ends 2.3. 4.5
This is a support plate for supporting the group of thin tubes within the closed container l. Reference numerals 6 and 6 denote hydrogen flow joints, which are supported by the support plate 4. Reference numerals 7 and 7 designate heat medium flow joints, which are supported by the support plate 5.

A large number of groups of 8 permeable bodies are provided between the hydrogen flow joints 6.6. The permeable body 8 #i is preferably made into a tubular body with an inner diameter of about 2 to 20 mm, and porous with a pore diameter of l to 5 μm. The material of the transparent body 8 is a porous molded product of synthetic resin such as fluororesin, a sintered synthetic resin, a nonwoven fabric of metal fiber or carbon fiber, a sintered metal, or sintered ceramics.

The transparent body 8 is preferably highly flexible, and the airtight container 1
If the inner diameter of the tubular permeable body 8 is less than 2 m, hydrogen flow resistance will be large, and if the inner diameter exceeds 20 m, the permeable body 8 will be expanded and compressed by the metal hydride. There is a tendency to get crushed. If the pore size of the pores of the permeable body 8 is less than 1 μm, the resistance to permeation and diffusion of hydrogen becomes large, and if it exceeds 5 μm, fine powder metal hydride tends to permeate through the pores.

An example of a large number of groups of 8 transparent bodies Fi is shown in FIG.

It's getting better. The heat medium tubes 9 groups are evenly distributed in the closed container 1, and the heat medium tubes 9 are shown positioned between the transparent bodies 8 and 80. The spaces between the 8 groups of permeable bodies and the 9 groups of heat medium tubes are filled with a finely powdered metal hydride 10. The heat medium tube 9 is preferably one having high elasticity and flexibility, and is made of polyethylene, polypropylene, vinyl chloride resin, fluororesin, or the like. These synthetic resins have the advantage that the refreshing substances in the heating medium do not adhere to them.

The elasticity of the heat medium tube 90 realizes absorption of the expansion and contraction of the metal hydride 10, and the flammability of the heat medium tube 90 prevents it from being destroyed by pressure caused by the expansion and contraction of the metal hydride 10. It is preferable that the inner diameter of the heat medium tube 9 is 2 or more in order to reduce the flow resistance of the heat medium, and that the rounding is 20 W or less to prevent the metal hydride 10 from being crushed due to expansion and contraction.

It is better for the 8 groups of hydrogen permeable bodies and the 9 groups of heat medium pipes to be thin and large in number, apart from hydrogen flow resistance and heat medium flow resistance. Therefore, in order to increase the rate of hydrogen diffusion into the hydrogen permeable body 8 and the rate of heat transfer between the heating medium and the metal hydride 100, the distance of hydrogen diffusion and the distance of heat transfer should be smaller. The distance between the hydrogen permeable bodies 8.8 and the distance between the heat medium pipes 9.9 are preferably K tf 1 to 50 m I/Cfk.

FIGS. 4 and 5 show another example of the present invention.

Heat medium flow joints 7.7 are supported by support plates 4.5 on the inside of both ends 2.3 of the closed container 1, and a hydrogen inlet/output O joint 11 is further supported by 1 support plate 4.

The permeable body 8a of the hydrogen permeable body 88 group is the permeable body 8 of FIGS.
The difference is that one end is sealed.

When two metal hydride reactors of the present invention are connected to move and exchange hydrogen to form a heat pump device, the hydrogen permeable bodies 88 group shown in FIG. Can be as busy as possible.

In addition, a heat insulating material layer 12 such as synthetic resin foam or asbestos is provided between the 10 layers of metal hydride and the inner wall surface of the closed container l.
The metal hydride 1o and the closed container 1 are insulated. By providing the heat insulating material layer 12, the heat generated by the metal hydride 1o is not transmitted to the closed container IK, but is transmitted to the heat medium flowing through the group of heat medium tubes 9, thereby reducing heat loss.

The metal hydride reactor of the present invention has the above-mentioned configuration buttons and exhibits the effects described below.

- Since the distance between the heating medium and the metal hydride is shortened, heat conduction between the two becomes good, and the hydrogen absorption/desorption reaction of the metal hydride can proceed rapidly.

■ Since the heat medium tube group consisting of many thin tubes is distributed and located in the metal hydride layer, the temperature distribution of the metal hydride layer is uniform, and the potassium and hydrogen absorption/desorption reactions can proceed uniformly. .

■ Since the hydrogen permeable body group consisting of many permeable bodies is located in the metal hydride layer, hydrogen diffusion from the hydrogen permeable body to the metal hydride occurs rapidly, and the hydrogen absorption/desorption reaction rate of the metal hydride is reduced. becomes large.

■ Since there are many heat medium tubes and hydrogen permeable bodies in the metal hydride layer, the expansion and contraction of the metal hydride is absorbed.
No force is applied to the wall of the sealed container, preventing deformation and damage, and reducing the thickness of the wall of the sealed container.

■ As mentioned above, the sealed container does not require pressure resistance and the reaction of the metal hydride layer can be carried out uniformly.
Operation can be simplified.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing an example of the metal hydride reactor of the present invention, Fig. 2 is a longitudinal sectional view taken along the line ■-■ in Fig. 1, and Fig. 3
The figure is a plan view showing an example of a hydrogen permeable group! FIG. 4 is a longitudinal cross-sectional view showing another example of the metal hydride reactor of the present invention, and FIG. 5 is a longitudinal cross-sectional view taken along the line 5 in FIG. iFi sealed container, 8+8aa hydrogen permeable body, 9#'i heat medium tube, 10 metal hydride. Patent applicant Sekisui Chemical Co., Ltd. Representative Mototoshi Fujinuma Figure 1 Figure 2! I! Figure 4 Figure 5

Claims (1)

[Claims] L A metal hydride is filled inside a closed container, and a group of heat medium tubes consisting of many thin tubes and a group of hydrogen permeable bodies consisting of a number of permeable bodies that permeate hydrogen but do not permeate metal hydride are inside the metal hydride layer. Metal hydride reactor characterized by being located in a busy position