JPH0811193B2 - Cylindrical honeycomb catalyst - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catalyst body used for exhaust gas purification of a combustion device, treatment of combustible harmful gas, catalytic combustion or the like.

2. Description of the Related Art A method of oxidizing and purifying a catalyst body for purifying exhaust gas provided in an exhaust gas passage of a combustion device such as an oil stove or a gas stove, or for treating combustible harmful gas such as an organic solvent discharged in a factory In some cases, the catalyst body has a flat plate structure composed of a porous body, a honeycomb body, or a fiber braid, and has one or more stages in the gas flow path and is horizontally arranged. It was installed (that is, at right angles to the flow direction of the exhaust gas).

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above-mentioned conventional configuration, in the flat catalyst body, the total amount of exhaust gas is collected here, and in order to purify by catalytic reaction, a tubular flow channel structure for guiding exhaust gas to the catalyst body In order to obtain a sufficient effective area of the catalyst body, the one-stage structure has a drawback that the diameter becomes large, the storage space becomes large, and the strength becomes weak. On the other hand, when the number of stages is increased, the pressure loss becomes large, and a temperature assurance means (for example, a heat retaining device, a heating device, etc.) is required to keep all the stages at a temperature suitable for the reaction. Furthermore, when the exhaust gas is purified by equipping the combustion device with the catalytic body, the entire one surface of the catalytic body is positioned to face the combustion section.
The radiant heat radiated from the upstream surface of the catalyst body, which has the highest temperature, is reduced to the combustion part, which causes the combustion part to have an abnormally high temperature and causes problems such as flashback and runaway combustion. Therefore, in reality, the catalyst body is installed at a considerable distance from the combustion section, and the exhaust gas cannot be collected in full due to the pressure loss of the catalyst body and leaks to the surrounding open section with less resistance, and therefore the exhaust gas It had the drawback that it could not be completely purified.

In view of the above problems, the present invention provides a catalyst body having a large effective surface area in a small space, high activity with low pressure loss, and easy production.

MEANS FOR SOLVING THE PROBLEMS The present invention is to support a catalytically active component on a honeycomb-shaped carrier piece in which a cylinder is vertically divided, and combine the carrier pieces into a cylindrical shape to form a support fitting at both ends. Is fixed and held to form a cylindrical honeycomb-shaped catalyst body.

Action The present invention makes it possible to secure a large area of effective catalyst surface in a small space and reduce the flow path resistance in addition to easy processing, no reaction gas leakage, and sufficiently large mechanical strength by the above means. . Especially when installed in a combustion device, a cylindrical honeycomb catalyst body that can almost completely collect exhaust gas to complete the purification reaction and at the same time reduce thermal reduction to the combustion part and prevent adverse effects on the combustion part It is provided.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.
In FIG. 1, reference numeral 1 is a carrier piece in which a catalytically active component containing platinum as a main component is carried on a honeycomb-shaped ceramic carrier which is processed into a vertically divided cylindrical shape, and three are combined to form a cylindrical catalyst cylinder 2. I am configuring. Reference numeral 3 denotes a top plate which is also mounted on the upper surface of the catalyst cylinder 2 and has a honeycomb-shaped ceramic disk supporting a catalytically active component. . Further, three bridging metal fittings 6 are provided by connecting the upper and lower metal fittings 4 and 5. As shown in the exploded view in FIG. 2, the carrier piece 1 has a curved honeycomb shape, is not bonded to the adjacent carrier piece 1, and is only pressed and supported by the support fittings 4 and 5. is there. The joint between the catalyst tube 2 and the top plate 3 is also the same, and is held by the support fitting 4 and pulled and held by the bridge fitting 6 at the bottom.

In such a shape and configuration, the joint between the carrier pieces 1 and the joint between the catalyst cylinder 2 and the top plate 3 have a microscopic gap to some extent, but sufficient catalytic activity is present on both surfaces. The components are supported, and when the reaction gas passes through the gap, the reaction is completely performed like other honeycomb openings,
There is no concern about leakage of the reaction gas. Therefore, the number of carrier pieces 1 can be set to an arbitrary number and a desired width in consideration of easiness of processing, and it is possible to avoid the difficulty of integrally forming the catalyst cylinder 2.

In addition, the catalyst cylinder 2 thus configured can secure a surface area determined by its diameter and height, and can be made small in diameter and large in area without being multi-staged. Therefore, when the reaction gas is provided in the flow path, even if it is mounted at an arbitrary position in the pipe, sufficient activity can be secured without increasing the pressure loss. Further, when this catalyst is used for purifying exhaust gas of a combustion device, it can be used by directly mounting it on the upper part of the combustion cylinder 7 as shown in FIG. That is, since it is a low pressure loss, it has no effect on combustion, and since the top plate 3 has a small area and is sufficiently separated from the combustion cylinder 7, there is almost no thermal effect on the combustion cylinder 7.
Moreover, since the exhaust gas passage is completely surrounded by the catalyst cylinder 2 or the top plate 3, there is no portion where the exhaust gas leaks,
A complete purification effect will be obtained. Of course, in this case
Alternatively, in other applications, the top plate 3 may not be used and only the catalyst cylinder 2 may be used (in that case, one end is closed), and the above effect is not impaired.

Further, the bridging metal member 6 may be outside or inside the catalyst tube 2,
The mechanical strength is remarkably increased as compared with the conventional flat plate type. Alternatively, when the support fittings 4 and 5 are held in the catalyst cylinder 2 by protruding the claws or the like, the support fittings 4 and 5 may be omitted and do not affect the above effects.

It is preferable that the cross-sectional shape of the catalyst cylinder 2 is a perfect circle in terms of strength and processing, but the shape is not necessarily limited thereto, and a substantially cylindrical shape is sufficient to satisfy the above-mentioned various effects.

EFFECTS OF THE INVENTION As described above, according to the present invention, a honeycomb-shaped carrier piece having a shape obtained by vertically dividing a cylinder is made to carry a catalytically active component, and a combination of these is made into a cylindrical shape, with supporting metal fittings at both ends. By fixing and holding the cap and forming a cylindrical honeycomb catalyst body, processing is easy and there is no leakage of reaction gas,
It is possible to provide a catalyst body which has a sufficiently large mechanical strength, secures a large area of an effective catalyst surface in a small space, and has a small flow path resistance. Also, especially when attached to the combustion device,
The exhaust gas is almost completely collected to complete the purifying reaction, and at the same time, the thermal reduction to the combustion section is reduced to prevent the adverse effect on the combustion section.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a cylindrical honeycomb-shaped catalyst body according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the cylindrical honeycomb-shaped catalyst body, and FIG. 3 is a usage example of the cylindrical honeycomb-shaped catalyst body. It is a principal part perspective view which showed. 1 ... Carrier piece, 2 ... Catalyst cylinder, 3 ... Top plate, 4, 5 ...
Support fittings, 6 ... Bridge fittings.

Claims (3)

[Claims] 1. A cylinder in which a catalytically active component is supported on a honeycomb-shaped carrier piece in a vertically divided mode of a cylinder, a plurality of the carrier pieces are assembled into a cylindrical shape, and at least both ends of the cylinder are provided with supporting metal fittings. Honeycomb catalyst body. 2. The cylindrical honeycomb-shaped catalyst body according to claim 1, wherein a disk-shaped catalyst-supporting honeycomb plate is mounted on one side opening of the honeycomb-shaped carrier piece assembled in a cylindrical shape. 3. The cylindrical honeycomb catalyst body according to claim 1 or 2, wherein a supporting metal fitting fitted on both ends of a honeycomb-shaped carrier piece assembled in a cylindrical shape is bridge-held.