JPS629941Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a catalyst body for gas treatment, and more particularly to an integrated catalyst-heat exchange body that effectively carries out a catalytic reaction of a gas that requires heating or cooling treatment together with heat exchange.

Gas processing using catalytic reactions is widely practiced in the petrochemical industry, the coal chemical industry, and in fields related to so-called pollution prevention that target combustion exhaust gas. In a catalytic reaction, in order to proceed with the desired reaction, the catalyst composition, gas composition, temperature,
It is necessary to select conditions such as pressure and contact time, but among these, the factor that consumes a large amount of energy is the temperature condition. This is particularly noticeable when the gas temperature on the upstream side is lower than the appropriate temperature range for the catalytic reaction. Cooling operations are also required when the temperature is higher than the appropriate temperature range, but if the heat source is a good one, the heat is recovered, but in many cases the heat is dissipated to the outside air or cooling water.

In contrast, the inventors of the present invention used a material with good heat transfer properties such as a metal plate as a substrate, applied a catalyst component to the substrate, and applied a plate-shaped catalyst body to the outer surface of the heat transfer body in the form of fins. By using the attached catalyst structure, we were able to integrate the heat exchanger and catalytic reactor and succeeded in downsizing the device. According to the catalyst structure described above,
Since the temperature of the catalyst part is close to the temperature of the heat transfer body and the substrate, the amount of heat required to heat or cool the processing gas can be reduced and the catalytic reaction can proceed effectively.
This makes it possible to integrate the heat exchanger and catalytic reactor in cases where gas cooling without heat recovery or a slight gas temperature increase operation of around 100°C is required to obtain temperature conditions suitable for catalytic reactions. .

However, in this catalyst structure, if a simple flat metal plate with good heat transfer effect is used as the substrate of the plate-shaped catalyst, the retention of the catalyst will be extremely poor. If you use a board like a metal wire mesh,
There were problems such as a significant decrease in heat transfer properties.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a plate-shaped catalyst body that has excellent catalyst retention and heat transfer properties.

The present invention provides a catalyst body in which a catalyst layer 6 is attached to at least the substrate processed portion 2 of a substrate 4 made of a material with good heat transfer, which is composed of a flat plate portion 1 and a substrate processed portion 2 machined by drilling or protrusion forming. This is an integrated catalyst-heat exchanger characterized in that it is attached to the surface of the heat transfer member 3 in the form of fins via the flat plate portion 1.

In short, the present invention uses a metal plate as the substrate of the plate-shaped catalyst body, makes the part including the joint with the heat transfer body a flat plate, and processes other parts by machining such as grooving, perforation, and protrusion formation. By applying surface treatment such as thermal spraying after these machining processes as necessary, catalyst retention is enhanced while maintaining heat conductivity.

The present inventors focused on the heat transfer properties of plate-shaped catalyst bodies having metal substrates, which have been invented and commercialized so far, and arrived at the present invention. The present invention will be explained below with reference to Examples.

FIG. 1 shows a rectangular example of a plate-shaped catalyst fin substrate according to the present invention. The shape of the fins may be circular, oval, fan-shaped, etc., but as shown in FIG. It is joined to the heat transfer body 3. As illustrated, the machining section 2 includes grooving (Fig. 1a), expanded metal machining (Fig. 1b), and knurling (Fig. 1B).
Figure c) etc. can be implemented. The cross section of each processed part is as shown in FIG.

FIG. 3 shows the state of bonding between the heat transfer body and the substrate using an example of a grooved plate. In this example,
The flat plate portion 1 of the substrate 4 is formed by grooving the heat transfer body 3.
are joined together. The substrate 4 may be joined directly to the heat transfer body by welding or the like without grooving the heat transfer body.

FIG. 4 shows a cross section of a coated catalyst, in which a substrate 4 is bonded to a heat transfer body 3, a thermal spraying process is applied to this, and a catalyst is applied to the sprayed layer 5 to form a catalyst layer 6. It is. The spraying material may be either metal or non-metal, but a metal spraying material is suitable in order to maintain heat conductivity.

FIG. 5 shows an example of a catalyst structure in which rectangular plate-shaped catalyst fins 7 are attached to a rod-shaped heat transfer body 3, where a shows a cross section in the circumferential direction and b shows a cross section in the longitudinal direction. The heat transfer body employed in the present invention may have a tube structure through which a heat medium can pass, and may have any shape such as a rectangle, polygon, or oval. Further, the shape of the plate-shaped catalyst fins may be circular, oval, etc. as described above, and furthermore, the shape of the plate-shaped catalyst fins may be perpendicular to the longitudinal direction.

Next, regarding the materials of the substrate and heat transfer body, these are ordinary metal materials, such as mild steel, low alloy steel, stainless steel, heat-resistant alloys, aluminum and its alloys, copper and its alloys, titanium and its alloys, etc. can be used. In some cases, common ceramic materials such as alumina and silica can be used.

The components of the catalyst to be applied differ depending on the desired reaction, but oxides of transition metal elements and platinum group elements are generally used, and if necessary, auxiliaries and additives are added and kneaded. A catalyst layer can be formed by coating or pressing a material.

Further, if a combustion catalyst is used as the catalyst layer 6, an appropriate fuel can be combusted by the catalyst in the area where the plate-shaped catalyst is arranged, and the combustion heat can be transferred to the heat transfer body 3.

In addition to the shape and materials used above, size is also an important factor, and this factor is strongly influenced by the device specifications. However, in general, it is suitable that the thickness of the substrate is 1 to 3 mm, the catalyst layer is about 1 mm, and the height of the plate-shaped catalyst fins from the heat transfer body is 50 to 100 mm. Furthermore, the length of the heat transfer body is suitably 1 to 5 mm.

Next, regarding the method of using the catalyst structure according to the present invention, it is preferable to use a plurality of catalyst structures in combination. It is preferable to install the plate-shaped catalyst fins parallel to the gas flow, and in cases where the accumulation of dust contained in the gas is to be avoided, it is preferable to adopt the plate-shaped catalyst fins installed in the longitudinal direction as shown in Fig. 5. .

The arrangement of the catalyst structures may be regular or irregular depending on the reactor structure.

The present invention provides the following effects.

(1) The bondability between the substrate of the plate-shaped catalyst body and the catalyst can be improved.

(2) It is possible to provide a plate-shaped catalyst body that maintains heat transfer properties and has excellent catalyst retention properties.

[Brief explanation of the drawing]

Fig. 1 is a front view of a rectangular plate-shaped catalyst fin substrate, Fig. 2 is a cross-sectional view of the same, Fig. 3 is a cross-sectional view showing the state of bonding between the heat transfer body and the substrate, and Fig. 4 is a cross-sectional view after coating the catalyst. 5 is a cross-sectional view of a catalyst structure in which plate-shaped catalyst fins are attached to a heat transfer body. 1...Substrate flat plate section, 2...Substrate processing section, 3...
Heat transfer body, 4...Substrate, 5...Sprayed layer, 6...Catalyst layer, 7...Plate catalyst fin.

Claims (1)

[Claims for Utility Model Registration] 1. A catalyst layer 6 is attached to at least the substrate processed portion 2 of a substrate 4 made of a material with good heat transfer, which is composed of a flat plate portion 1 and a substrate processed portion 2 which has been machined by drilling or protrusion forming. An integrated catalyst-heat exchange body characterized in that a catalyst body is attached to the surface of a heat transfer body 3 in the form of fins via the flat plate portion 1. 2. The integrated catalyst-heat exchanger according to claim 1, wherein the substrate 4 is surface-treated after the machining, and a catalyst layer 6 is attached to the surface-treated surface. 3. The integrated catalyst-heat exchanger according to claim 2, wherein the surface treatment is a thermal spraying treatment.