JPS5978901A - Hydrogen supply device - Google Patents

Abstract

PURPOSE:To provide an inexpensive and safe titled device which can supply easily hydrogen at an ordinary temp. by constituting said device wherein a porous pipe provided in a vessel packed therein with a metallic hydride having an adequate equil. pressure for dissociation of hydrogen is communicated with the opening of a vessel through a filter. CONSTITUTION:A partition wall 3 having a through-hole 4 is provided in a vessel 1 having an opening 2 at one end, and a filter 5 which allows the permeation of hydrogen but prohibits the permeation of a pulverized metallic hydride is provided in the hole 4 to prevent the scattering of the pulverized powder to the outside of the vessel. Said filter is communicated with the opening 2. A porous pipe 6 which allows the permeation of hydrogen but prohibits the permeation of the metallic hydride is connected to said filter 5 and provides a passage for hydrogen. The metallic hydride which is obtd. from an MmNiAl alloy or the like (Mm is Mischmetal) and has 1.2-10atm equil. pressure for dissociation of hydrogen at 20 deg.C is packed around said pipe. A valve body 7 which is opened by >=10 atm hydrogen pressure is provided to assure safety; further, a connector 8 which is normally held closed is mounted in the opening 2 and is made to have corresponding male and female shape to a connector 9 attached thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hydrogen supply device, and more particularly to a hydrogen supply device that incorporates a metal hydride that stores hydrogen and can safely and easily supply hydrogen at product temperature.

It is known that certain metals and alloys exothermically absorb hydrogen to form metal hydrides, and that these metal hydrides reversibly and endothermically release hydrogen. L1 is expected to be used as a hydrogen storage and supply device that takes advantage of the characteristics of metal hydrides.

Unlike conventional hydrogen supply devices such as hydrogen gas cylinders and hydrogen generators, the present invention uses a metal hydride that stores hydrogen as a hydrogen supply source to supply hydrogen at low cost, safety, and convenience. The purpose is to provide a hydrogen supply device that can.

The hydrogen supply device of the present invention includes a container having an opening at one end;
A filter that transmits hydrogen but does not transmit metal hydride is installed in the container so as to communicate with the opening, and a filter that transmits hydrogen but does not transmit metal hydride is connected to the filter and extends in the axial direction of the container. A porous tube that does not permeate hydrides and a container filled with the outer space of this porous tube have a hydrogen dissociation equilibrium pressure of 1.2 to 1 at a temperature of 20°C.
A metal hydride having a pressure of 0 atm, and a valve body that opens the inside of the container when the hydrogen pressure inside the container is 10 atm or more.
The device is characterized by comprising a connector connected to the container opening and closed in a lightning condition.

1 and 2 do not show an embodiment of the hydrogen supply device of the present invention. The container I has an opening 2 at −・+>iil, and the opening 1 is isolated from the inside of the container by a partition 3, and Yf of this partition
A filter 5 that allows hydrogen to pass through but does not allow metal hydrides to pass through is attached to the pJ through hole 4, which communicates with the opening L1. If metal hydrides do not repeatedly absorb and release hydrogen, the particle size may become as small as several 71 (t'5), which may fly out of the container when hydrogen is supplied, so a filter is used to prevent this. It is. The tuff filter desirably has a pore size of 2 microns or less and is formed, for example, from porous sintered metal.

Connected to the filter, a porous tube 6 that allows hydrogen to pass through but does not allow metal hydrides to pass through is attached to one end of the porous tube 6.
' LJ, and the other end extends along the tube axis to the bottom of the container or near the bottom of the container, and the axial hydrogen flow in the container is 1/2.
&. In addition to the porous tube, &iAl is fixedly supported at the bottom of the container as required.

As shown in FIG. 3, the logarithm of the hydrogen dissociation equilibrium pressure P of a metal hydride generally has a linear relationship with the reciprocal of the absolute temperature 'r, but the metal hydride used in the present invention does not release hydrogen at room temperature. The hydrogen PJ'l equilibrium pressure at a temperature of 20 DEG C. is selected to be 1.2 to 10 atm so that the hydrogen can be released in one well. Specific examples of such metal hydride alloys are listed in the table below.

In particular, in the present invention, the atmosphere is generally used as a heating source,
Since the metal hydride releases the hydrogen occluded, it is desirable that the metal hydride has a small reaction heat, and from this point of view, 8mNiAl-based and MmNiMn-based alloys are preferably used. Here, Mm is Mitsushmetal, which is a mixture of rare earth elements.

The metal hydride container of the present invention has a valve body 7 so that hydrogen can be automatically released to the outside of the container when the hydrogen pressure inside the container suddenly becomes crystallized.

As described above, the container 2n of the present invention is used at room temperature and has a hydrogen dissociation equilibrium pressure specified as a metal hydride, but in practice, the hydrogen pressure inside the container is IO pressure It is preferable to use a valve body that automatically opens when the pressure exceeds 10 atm and closes automatically when the pressure drops below 10 atm. Valve bodies that automatically open and close in response to the pressure are already commercially available. easily available. For example, as a metal hydride alloy, Mm N r 4.6^'0.4
The temperature at which the dissociation equilibrium pressure of hydrogen reaches 10 atm is 55°C. The position where the valve body is placed in the container is
Particularly, but not limited to, threading, between containers [
A suitable value is near .

A connector 8, which is closed in the tπ state, is attached to the opening 1 and 2 of the metal hydride container.Here, the normal state means that the metal hydride container is in a closed state when the metal hydride container supplies hydrogen, etc. This means that it is not in use, and when it is used, it will automatically connect the hydrogen pipe between the connectors when it is connected to the connectors listed above. A second connector 9 to be formed is provided at the use end.

Various types of connectors consisting of a pair of male type and -m type have already been proposed and are commercially available. The second connector is connected to the carrier cass pipe by a suitable joint, for example, when hydrogen is supplied from the container of the present invention as a carry gas for a gas tank 1'' gas flow.

Furthermore, in the container of the present invention, heat exchange between hydrogen on the surface of the container and the gold J7i5 hydride falling inside the container when releasing hydrogen and replenishing hydrogen is preferably carried out. 7f" (for rapid operation, appropriate fins 10 and 11 are installed inside and outside the container. In the illustrated embodiment, the fins 10 in the container extend radially from the inner wall of the container and are connected to the porous tube. It also plays a supporting role.

Further, the space within the container is divided into two or more compartments by a partition wall 12 that is permeable to hydrogen but not permeable to metal hydrides. The partition wall material is preferably one that has elasticity;
Therefore, layers of ceramic fibers such as glass fibers, alumina fibers, silica fibers, and silica-alumina fibers are preferably used. By dividing the filling space of the metal hydride with the above-mentioned elastic material, the volume change when the metal hydride absorbs and releases hydrogen is absorbed and the container is prevented from breaking. If it is possible to do so, it is possible to construct a transverse hydrogen passage within the container and rapidly carry out the hydrogen absorption and release reaction of the metal hydride.

According to the device of the present invention, the product temperature is 21%.
．． Hydrogen can be supplied to 1 without requiring heat IJ+Jf, making it safer, cheaper and more compact than conventional hydrogen gas cylinders and hydrogen generators. For example, it can be individually installed in a phase separation device such as a gas chromatograph, and therefore can be easily used as a hydrogen supply device without requiring long piping.

[Brief explanation of drawings]

Fig. 1 is a dark blue sectional view showing an embodiment of the hydrogen supply device of the present invention, and Fig. 2 is a horizontal tl along the line II-II in Fig. 1.
Ji plane diagram, Figure 3 (Hydrogen decomposition of metal hydrides)
This is a graph that does not show flat 1φ1 pressure special bamboo. 1... Container, 2... Open 1", 5... Filter,
6...Porous pipe, 7...Valve body, 8...Connector, 1
(), 11... Fin, 12... Partition wall. 12 “Applicant Sekisui Chemical” Nigyo Co., Ltd. Representative Ichigo Mototoshi Numa 3-

Claims (1)

[Claims] (1) - A container having I with respect to 1, a filter that permeates hydrogen but does not permeate metal hydrides and is installed in the container so as to communicate with the opening, and is connected to the filter, and A porous tube that permeates hydrogen in the axial direction of the container but does not permeate metal hydrides, and the space outside the porous tube is filled in the container with a hydrogen dissociation pressure of 1 at a temperature of 20°C. 1.When the metal hydride is at a pressure of 2 to 10 atm and the water in the container is above 10 atm, the inside of the container is opened to the atmosphere and connected to the opening of the container. A hydrogen supply device characterized by comprising a connector that is closed in a critical state.