JPH02218441A - Catalyst or catalyst carrier - Google Patents

Abstract

PURPOSE:To prevent the relative movement of two adjoining catalyst plates by forming the recesses and projections of the adjoining corrugated plates allover in the contact part into such shape as to permit them to be engageably overlapped. CONSTITUTION:The interengaging parts of a first corrugated plate and a second corrugated plate are both formed into such shape as to permit their overlapping. The projections of the first corrugated plate are inserted into the recesses of the second corrugated plate to exert lateral force thereon so as to avoid relative displacement therebetween, thereby heightening their mechanical strength.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a catalyst or a catalyst support, and particularly to a catalyst or a catalyst support formed by stacking two types of corrugated plates.

[Prior Art] Various types of catalysts or catalyst supports have been proposed that are constructed by alternately stacking two types of corrugated plates with different waveforms for the purpose of removing nitrogen oxides or for catalytic combustion. has been done. According to Japanese Unexamined Patent Publication No. 63-182038, as shown in FIG. The second corrugated plate 2, which mainly determines the angle, has a waveform with a period λ2 and an amplitude A2, and between λ1 and λ2, A2 = □ A1 m where n-1, °2 or 3 m = 1.2 .3.4.5 or 6 There is a relationship of m≧n, and the amplitude A2 is selected to be smaller than A1.

[Problem to be solved by the invention]

Although the above-mentioned known example has a feature that the cross-sectional area distribution of the gas passage is uniform, it has the following drawbacks. That is, firstly, the space near the contact portion 3 between the first corrugated plate l and the second corrugated plate 2 is extremely narrow and does not substantially act as a catalyst surface, and this portion does not function as an effective surface.
Material will be lost. The second drawback is the first
Since the contact portions 4 of the corrugated plate 1 and the second corrugated plate 2 are convex and in contact with each other, when a vertical or horizontal force is applied, relative displacement or movement of the product is likely to occur. From the viewpoint of uniform passage cross-sectional distribution and mechanical strength, it is necessary to completely fix this contact point 4 chemically or mechanically, such as by brazing.

Therefore, an object of the present invention is to provide a catalyst or a catalyst support that does not exhibit the above-mentioned drawbacks. It is an object of the present invention to provide a catalyst or a catalyst support that does not cause any relative displacement in response to external force without applying any chemical or mechanical bonding at the contact portions of adjacent corrugated plates.

[Means to solve the problem]

An object of the present invention is to provide a catalyst or catalyst support structure in which catalyst or catalyst support corrugated plates having waveforms with different periods and amplitudes are stacked adjacent to each other, in which all contact portions of the adjacent corrugated plates are stacked with each other. This problem can be solved by using a catalyst or catalyst support structure characterized by forming concave portions and convex portions so that they fit and overlap. Relative displacement of adjacent catalyst plates can be prevented without joining.

Also, among the corrugated plates adjacent to each other, the first corrugated plate has a period λ1 and an amplitude ! , the second corrugated plate has a period λ2,
A waveform with an amplitude of 12, ! , > 12, and A1
and A2, λ2=A1 However, it is preferable to construct such that there is a relationship where n is an odd number.

Furthermore, among the mutually adjacent corrugated plates, the shape of the first corrugated plate is substantially sinusoidal or trapezoidal, and the shape of the second corrugated plate is composed of a concave portion, a convex portion, and a linear portion. is preferred.

[Effect]

First, a case will be described in which the first corrugated plate and the second corrugated plate are both sinusoidal.

By making the contact portions of the first corrugated plate and the second corrugated plate the same and overlapping each other, the convex portion of the first corrugated plate is inserted into the concave portion of the second corrugated plate, Even if a force is applied in the left and right direction, no relative displacement will occur between the two.

In order to establish such a situation with the second corrugated plates located above and below the first corrugated plate, assuming that the waveform periods of the first and second corrugated plates are A1 and A2, respectively, λ2= A1, n= By stacking two types of corrugated plates alternately, the contact area between the first corrugated plate and the second corrugated plate has the structure shown above at any location, and both can be mechanically separated. , it is possible to obtain a catalyst or catalyst support that does not undergo relative displacement due to external force without chemical bonding.

Alternatively, the same effect can be obtained by forming the second corrugated plate alternately with concave portions and convex portions only at the positions where the second corrugated plate contacts the first corrugated plate, and making the other portions smooth.

On the other hand, the shape of the first corrugated plate is not only the sinusoidal shape described above, but also a polygonal shape, such as a triangle or trapezoid, and the first corrugated plate contact portion of the second corrugated plate is similar to the contact portion of the first corrugated plate shape. The same effect can be obtained even if the surface is made into a polygonal shape such as a triangle or trapezoid, and other non-contact parts are made smooth.

In order to construct a catalyst having such a shape as a catalyst or a catalyst support, two types of corrugated plates may be laminated as described above, or they may be wound spirally.

〔Example〕

FIG. 1 shows a part of a structural diagram of an embodiment of a catalyst or catalyst support according to the invention.

As described above, both the first corrugated plate 1 and the second corrugated plate 2 are sinusoidal, and the relationship between their periods λ2 and λ2 is λ2=λ in this case.

Note that the amplitudes of both waveforms f, , l! may be arbitrary, but considering specific surface area, pressure loss, aperture ratio, etc., lI>21z is preferable.

In addition, the materials constituting the first and second corrugated plates are as follows:
It is not particularly limited depending on the purpose of use, and it can be anything that can be molded and processed, such as metals, inorganic fibers, or materials with catalytically active contact parts supported on them. There are no particular limitations.

In the case of this embodiment, since the second corrugated plate also has a sinusoidal shape, it also has the unique effect of having a larger specific surface area than the smooth plate described later. Furthermore, since both contact portions overlap, no relative displacement occurs due to external force.

Other embodiments according to the present invention are shown in FIGS. 2-4.

In the case of FIG. 2, in the embodiment of FIG. 1, the shape of the second corrugated plate other than the contact portion between the first corrugated plate and the second corrugated plate is made flat.

Furthermore, in FIGS. 3 and 4, the first corrugated plate shape is triangular and trapezoidal (as an example of a polygonal shape), and in this case, as in FIGS. 1 and 2, adjacent corrugated plates are The effect of fixing is similar.

Although not shown, the specific surface area may be increased by forming the non-contact portion of the second corrugated plate with the first corrugated plate into a triangular, trapezoidal, etc. shape, as in FIG.

In addition, FIG. 5 shows a configuration in which a semicircular convex portion is provided in a portion of the first corrugated plate other than the contact portion with the second corrugated plate.
The strength of the corrugated plate can be improved. Further, in FIG. 6, the non-contact portion of the first corrugated plate with the second corrugated plate is further formed into a sinusoidal curve shape, so that the specific surface area can be improved.

〔Effect of the invention〕

According to the present invention, mutual movement can be restrained without mechanically or chemically bonding the first corrugated plate and the second corrugated plate, which are adjacent corrugated plates constituting the catalyst or the catalyst support, and the mechanical strength is increased. can be increased.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of a first embodiment of a catalyst or catalyst support according to the present invention, FIGS. 2 to 7 are structural diagrams of a catalyst or catalyst support showing other embodiments of the present invention, and FIG. The figure is a structural diagram of a catalyst support according to the prior art. l...first corrugated plate, 2...second corrugated plate, 3.4...
・Contact area between both corrugated plates. Applicant Babcock Hitachi Co., Ltd. Agent Patent Attorney Takeshi Kawakita Figure 1 Figure 2 Figure 3

Claims (3)

[Claims] (1) In a catalyst or catalyst support structure formed by stacking adjacent catalyst or catalyst support corrugated plates having waveforms with different periods and amplitudes, all the contact parts of the adjacent corrugated plates are mutually concave and convex. 1. A catalyst or catalyst support structure, characterized in that the catalyst or catalyst support structure is configured such that the parts form and overlap each other. (2) In claim (1), among the mutually adjacent corrugated plates, the first corrugated plate has a waveform with a period λ_1 and an amplitude l_1, and the second corrugated plate has a waveform with a period λ_2 and an amplitude l_2, A catalyst or catalyst support structure characterized in that l_1>l_2, and there is a relationship between λ_1 and λ_2 as follows: λ_2=(1/n)λ_1, where n is an odd number. (3) In claim (1), among the mutually adjacent corrugated plates, the first corrugated plate has a substantially sinusoidal or trapezoidal waveform, and the second corrugated plate has a concave portion, a convex portion, and a linear shape. A catalyst or catalyst support structure comprising: