JPH047154Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a hydrogen purification device that purifies hydrogen gas using a palladium permeable membrane.

[Conventional technology]

Generally, as a hydrogen purification apparatus for highly purifying hydrogen gas using a palladium permeable membrane, an apparatus as shown in FIG. 6 is known. In the figure, 1
is a thin tube for hydrogen permeation formed in the shape of a cylinder with a bottom.
As shown in Fig. 7, a wire 2 wound in a spiral shape
The outer periphery of is covered with a palladium permeable membrane 3. This hydrogen permeation thin tube 1 is heated at a high temperature (300~
High purity is achieved by dissociating only hydrogen molecules on the outer surface of the palladium-permeable membrane 3, passing them through the palladium-permeable membrane, and associating them inside to form hydrogen molecules again. . Reference numeral 5 denotes a pure hydrogen extraction cylindrical body, which has a bottom plate with porous through holes, into which the upper openings of the hydrogen permeation thin tubes 1 are respectively inserted and suspended. 5a is a pure hydrogen extraction pipe extending from the upper part of the pure hydrogen extraction cylinder 5, and 5b is an engaging stepped portion formed on the outer peripheral surface of the pure hydrogen extraction cylinder 5. Reference numeral 6 denotes a cylindrical housing with a bottom, the inside of the tip of the upper opening being formed as a joint part 7, and inside the upper opening,
By positioning the lower end of the hydrogen permeation capillary tube 1, lifting the entire cylinder 1, and engaging the joint part 7 with the engagement step part 5b on the outer circumferential surface of the pure hydrogen extraction cylinder 5, the cylinder body It is attached to 5. Reference numeral 8 denotes a screw body, which is provided on the outer periphery of the joint portion 7 and the step portion 5b, and is tightened to strengthen the engagement between the two and to make the engagement portion airtight. Reference numeral 9 denotes a supply pipe provided at the bottom of the housing 6, which supplies hydrogen gas mixed with impurities to the inside of the housing 6. 1
Reference numeral 0 denotes a rectifying material filled in the bottom of the housing 6, which is formed into a cotton-like shape by intertwining a plurality of spiral metal pieces, and diffuses the hydrogen gas supplied from the pipe 9 to flow inside the housing 6. It is designed to flow upward in a uniform state. Reference numeral 11 denotes an exhaust gas discharge pipe whose one end is open on the outer peripheral surface slightly above the center of the housing 6.
Impurities that are supplied inside and do not pass through the permeable membrane are discharged to the outside together with a small amount of hydrogen gas.

[Problem that the invention attempts to solve]

However, in the above-mentioned hydrogen purification device, the exhaust gas exhaust pipe 11 is provided slightly above the middle of the housing to exhaust the exhaust gas after hydrogen permeation. Impurity-containing gas remains. In other words, the partial pressure of impurities remaining in the upper part of the hydrogen permeation thin tube 1 increases, the permeation efficiency decreases, and the amount of impurity-containing hydrogen to be discharged from the exhaust gas discharge pipe 11 has to be increased. There is. In addition, this device rectifies impurity-containing hydrogen gas supplied from the upper part of the supply pipe 9 with a rectifier 10 made of entangled spiral metal pieces,
This rectifying material 10 has uneven distribution of spiral metal pieces, so it is difficult to uniformly rectify the flow.
Since a lot of metal powder generated during processing is attached to the surface of the rectifying material 10, this metal powder flies inside the housing 6 due to the flow of hydrogen gas and adheres to the surface of the palladium permeable membrane 3. This causes a problem in that the palladium permeable membrane 3 becomes brittle and the life of the hydrogen permeable thin tube is shortened.

This invention was devised in view of these circumstances, and its purpose is to provide a hydrogen purification device with high hydrogen purification efficiency.

[Means for solving problems]

In order to achieve the above object, the hydrogen purification device of this invention includes a pure hydrogen extraction cylinder which is equipped with a pure hydrogen extraction pipe and is formed in an airtight manner, and one end of which is closed and the other end of which is connected to the pure hydrogen extraction cylinder. A plurality of thin tubes for hydrogen permeation that are open on the side opposite to the surface on which the hydrogen extraction pipe is attached and hang down from the pure hydrogen extraction cylinder with one end facing down, and a bottomed tube that accommodates the plurality of thin tubes for hydrogen permeation. a connector for removably connecting the upper opening of the bottomed cylindrical housing to the pure hydrogen extraction cylinder; an exhaust gas discharge pipe having one end opening into the circumferential body of the bottomed cylindrical housing; is provided with a supply pipe for supplying impurity-containing hydrogen that opens at the center of the bottom of the bottomed cylindrical housing, and the vicinity of the upper opening of the bottomed cylindrical housing is formed with a large diameter part, and the exhaust gas discharge pipe is One end is this large diameter part,
It also has a configuration in which it opens above the hydrogen permeation thin tube.

Next, this invention will be explained in detail based on examples.

〔Example〕

FIG. 1 shows an embodiment of this invention. That is, this hydrogen purification device has a pure hydrogen extraction cylinder 1
A flange 18 is provided horizontally protruding from the upper outer peripheral surface of the housing 7, while the upper part of the bottomed cylindrical housing 19 is formed into a large diameter part 20, and a flange 21 corresponding to the flange 18 is provided on the upper outer peripheral surface of the bottomed cylindrical housing 19. There is. Then, in this large diameter portion 20, the pure hydrogen extraction cylinder 1 is placed.
7 and a large number of hydrogen permeation thin tubes 1 hanging down from the bottom of the cylindrical body 17.
9, the flanges 18 and 21 are connected to the left and right sides through an O-ring 23.
Tighten with the split clamp 24 (see Figure 2),
The pure hydrogen extraction cylinder 17 and the housing 19 are integrated. When the clamp 24 is not in the tightened state, it has an arch shape that widens toward the end as shown by the solid line in FIG. ,
A substantially V-shaped groove 26 (first
(see figure) to provide uniform tightening force. Further, in this embodiment, one end of the exhaust gas discharge pipe 27 is connected to the large diameter portion of the housing 19.
0, and the upper part of the supply pipe 28 protrudes from the bottom of the housing 19, and the fourth
As shown in the drawings and FIG. 5, gas outlets 35 are formed on the outer peripheral surface of the protrusion 29 at predetermined intervals in the circumferential direction by closing the upper opening. By controlling the gas outlet 35 in this manner, the supplied gas can be uniformly supplied into the housing 19 and raised within the housing 19 as a laminar flow without requiring the conventional flocculent straightener. The other parts are the same as in FIG.

In this configuration, impurity-containing hydrogen gas blown out from the gas outlet 35 of the supply pipe 28 becomes a uniform laminar flow due to the action of the gas outlet 35 and rises inside the housing 19, and is passed through the hydrogen permeation capillary 1 into pure hydrogen gas. only is collected in the pure hydrogen extraction cylinder 17,
The impure gas is discharged from the exhaust gas discharge pipe 27.

Thus, in this embodiment, the supply pipe 28
The upper end protrudes into the housing 19 to close the upper opening, and gas outlets 35 are provided on the outer circumferential surface at predetermined intervals in the circumferential direction. This makes it possible to prevent the palladium permeable membrane 3 of the hydrogen permeation thin tube 1 from deteriorating due to the metal pieces attached to the flocculent rectifying material, thereby extending the life of the hydrogen permeation thin tube 1. In addition, the upper part of the housing 19 is made particularly large in diameter, and one end of the exhaust gas discharge pipe 27 is opened there, so that impurity gas is removed using a housing that has the same thickness throughout as in the conventional example (Fig. 6). Since the impure gas is not allowed to be released, the impure gas is easily sucked into the large diameter portion 20 when removing the gas, and the impure gas can be extracted efficiently. Moreover, since the hydrogen permeation capillary tube 1 is not extracted from the upper part of the housing 19, instead of being extracted from the middle part of the housing as in the conventional example, the entire hydrogen permeation capillary tube 1 can be effectively used for hydrogen purification. Together with the above-mentioned high efficiency of impure gas discharge, the efficiency of hydrogen purification can be greatly improved. In particular, by making the upper part of the housing larger in diameter and performing the extraction from there, there will be no problem even if the lower part (other than the upper part) of the housing is made smaller in diameter.
Therefore, by reducing the diameter of the lower portion of the housing, the device can be made smaller. Moreover, in this embodiment, the pure hydrogen extraction cylinder and the housing are integrated by fitting the flanges together and tightening them with a clamp instead of using a conventional bite-type joint. There is no metal surface shavings (particles) caused by this, and moreover, accurate bonding can be achieved.

In the above embodiment, the opening on the outer peripheral surface of the supply pipe is formed into a rectangular shape, but it may be formed into a circular, elliptical, polygonal, or other shape, and the shape is not limited in any way. In some cases, the integration of the pure hydrogen extraction cylinder and the housing may be
It is also possible to use a bite joint as shown in the figure.

[Effect of idea]

As described above, in the hydrogen purification device of this invention, the vicinity of the upper opening of the bottomed cylindrical housing is formed into a large diameter part, and one end of the exhaust gas discharge pipe is opened into this large diameter part, so that hydrogen This makes it possible to effectively utilize the entire permeation tube, resulting in an improvement in hydrogen purification efficiency.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of this invention, Fig. 2 is a partially cutaway plan view of the clamp used in it, Fig. 3 is an explanatory diagram of its tightening, and Fig. 4 is the first embodiment of the invention.
FIG. 5 is an enlarged sectional view of the bottom of FIG. 1, FIG. 6 is a sectional view of the conventional example, and FIG. 7 is a partially enlarged sectional view of the hydrogen permeation thin tube. DESCRIPTION OF SYMBOLS 1... Thin tube for hydrogen permeation, 3... Palladium permeation membrane, 17... Pure hydrogen extraction cylinder, 19... Housing, 24... Clamp, 27... Exhaust gas discharge pipe, 28... Supply pipe.

Claims (1)

[Scope of utility model registration request] A pure hydrogen extraction cylinder is provided with a pure hydrogen extraction pipe and is formed in an airtight manner, and one end is closed and the other end is opened on the opposite side of the pure hydrogen extraction cylinder to the surface on which the pure hydrogen extraction pipe is attached. A plurality of hydrogen permeation thin tubes that hang down from the pure hydrogen extraction cylinder in a downward state, a bottomed cylindrical housing that accommodates the plurality of hydrogen permeation thin tubes, and an upper opening of the bottomed cylindrical housing that is a coupling device that is detachably connected to the pure hydrogen extraction cylinder; an exhaust gas discharge pipe that has one end opening into the circumferential body of the bottomed cylindrical housing; and an impurity-containing pipe that has one end that opens at the center of the bottom of the bottomed cylindrical housing. The bottomed cylindrical housing has a supply pipe for supplying hydrogen, and the vicinity of the upper opening of the bottomed cylindrical housing is formed with a large diameter part, and one end of the exhaust gas discharge pipe is the large diameter part, and is connected to the capillary tube for hydrogen permeation. A hydrogen purification device characterized by an opening at the top.