JPH0356253Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is particularly applicable to internal combustion engines and power devices, which consist of a continuous strip of a combination of a corrugated steel strip and a flat steel strip on which a layer of catalytic material can be formed. The present invention relates to a filling matrix for a catalytic reactor for purifying exhaust gas in a catalytic reactor.

[Conventional technology]

A filling matrix is formed by continuously winding three layers, that is, a strip layer consisting of two flat steel strips and a corrugated steel strip interposed between them, or a strip layer consisting of only one corrugated steel strip. However, a matrix is known in which a flap-shaped punched protrusion formed in each layer is pushed into a corresponding hole in an adjacent layer in order to fix continuous band-like layers wound together in the axial direction (German patent). Specification No. 2733640). It is also known to superimpose corrugated steel sheets on flat steel strips or to combine individual flat steel sheets with corrugated steel sheets in order to enhance the turbulence effect of the exhaust gases flowing through such a matrix (Germany). Patent Application Publication No. 2902779).

[The problem that the idea attempts to solve]

However, in any of the above-mentioned known examples, especially when the strip steel plate used is composed of a plurality of strip plates,
A disadvantage is that the manufacturing costs of such filling matrices are relatively high. A particular problem is that in the known configuration, the matrix is formed by winding a steel plate, so the matrix can only be inserted into a substantially circular casing, and the external shape of the reactor is limited by the structure of the matrix. It is. moreover,
It is also a disadvantage that a radial equalization of the exhaust gases flowing through the filling matrix and the reactor is either not possible at all or is very insufficient, even if the steel strips described above are provided with through holes.

The object of the present invention is to provide a packing matrix for a catalytic reactor that allows reactors with arbitrary external shapes to be provided at low cost and that also allows for improved radial equalization of exhaust gases.

[Means to solve the problem]

In order to solve the above problems, the present invention consists of a continuous band-like layer consisting of a corrugated steel band on which a layer of catalytic material can be formed and a flat steel band on both sides of the corrugated steel band, and the continuous band-like layer The present invention provides a packing matrix for a catalytic reactor for purifying exhaust gas, characterized in that the matrix is arranged in a casing in a meandering and folded state.

[Effect]

According to the invention, the filling matrix is constructed as a continuous band-like layer in which the individual layers are folded in a serpentine manner. This arrangement allows the individual layers of the steel strip to be connected relatively easily, leaving at least one side open during the manufacturing process. Therefore, compared to rolled-up filling matrices, where equalization of the exhaust gases can only be achieved in the circumferential direction, the present invention facilitates the flow of the exhaust gases in the radial direction, resulting in an equalized flow. be done. Thereby, the catalyst layer located on the outer side in the radial direction can also contribute to the reaction, and the matrix can be utilized more effectively.

In order to simplify manufacturing, it is possible to create a perforation-like bend in advance at the bending position of the strip steel plate for forming the matrix. filling matrices can be easily manufactured. That is, by sliding the endless paper inside the chute in the same manner as folding it while lowering it vertically into the chute after printing, it will be easily folded along the bending portion and folded into the desired matrix shape. The matrix formed in this way can then be inserted, for example, into a two-part casing, and the two parts of the casing can then be joined and fixed in the axial direction. It may also be inserted axially through a funnel into the already closed tubular casing.

〔Example〕

Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

1 to 4 illustrate an embodiment unique to the present invention in which continuous strip layers 7, 7' are folded in a meandering manner when forming a catalytic reactor for exhaust gas purification. As the belt-shaped steel plate, for example, a belt-shaped plate as shown in FIG. 6 is used. In FIG. 6, two flat steel strips 1 having through-holes 2 and a corrugated steel plate 3 located between the two are combined to form continuous strips 7, 7a, 7b,
7', and the steel plates are joined, for example, by soldering.

In the present invention, as shown in FIG. 1, such a continuous band-like layer 7 can be bent into a meandering shape to form a matrix with a rectangular cross section as shown in FIG. 1, and placed in a rectangular casing 8. can. It is even easier to fold the continuous strip layer 7 in a zigzag pattern as shown in FIGS. 2, 3, and 4. In this case, if a bending part 9 is provided at each bending point in the form of a perforation, for example, simply by dropping it from above into a suitable chute, the continuous strip layer 7' will be folded into a zigzag shape and automatically Individual layers 7a, 7b are formed and folded over. In this case, if the individual layers 7a and 7b are given different lengths a and b as shown in FIGS. 2 and 3, the elliptical casing 10 as shown in FIG. 3
A profile is obtained which can be respectively adapted to the circular tubular casing 11 as shown. As shown in Figure 4,
It is also possible to obtain a matrix which can be arranged in a rectangular cross-section casing 12, as shown in FIG. 1, by making the length b of the individual folded layers the same.

In the embodiment, for example, as shown in FIG.
The continuous strip layers 7, 7' as shown in the figure are folded in the manner shown in FIG.
and the lower part 14, in the axial direction, that is, the arrow 15
It is also fixed in the flow direction shown by . It goes without saying that the manufacturing materials, the flat steel strip 1 and the corrugated steel strip 3, are coated with a catalytic material in a known manner, that is, a layer of the catalytic material is formed, as well as the matrix constructed in this way. has the advantage of being extremely simple to manufacture. Exhaust gas can flow along the interface 17 of the individual layers 7A, 7B, in particular on the opposite side of the bend an opening 16
This allows exhaust gas that has entered the periphery of the casing to flow toward the center. Moreover, through hole 2
Since this is provided, it is possible to equalize the exhaust gas also in the direction perpendicular to the boundary surface 17 between the individual layers 7A and 7B.
The total opening area of all the through holes 2 may be set so as to achieve radial equalization while making it possible to form a flow profile without variation. In light of experience, generally speaking, the above conditions can be met if the total opening area of the through holes 2 is 5% or more of the area of the boundary surface 17. The through-holes 2 can be formed in the wave direction or in a direction 2' perpendicular thereto, the latter being preferred since they overlap correctly in the laminated state.

[Effect of idea]

As explained above, according to the present invention, it is possible to obtain a packing matrix for a catalytic reactor that can be manufactured easily and at low cost and that can equalize the flow of exhaust gas.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram schematically showing an embodiment of the present invention in which continuous strips of steel strips used for manufacturing a filling matrix are bent and folded in a serpentine shape, and Fig. 2 shows a reactor with an elliptical cross section. FIG. 3 is an explanatory diagram schematically showing continuous strip layers of steel strips folded in a zigzag pattern such that the steel strips are folded in a zigzag pattern. FIG. Figure 4 is an explanatory diagram schematically showing the zigzag folding mode of continuous strip steel sheets constituting a rectangular cross-section reactor, and FIG. 5 is a continuous strip layer of three-layer strip steel sheets for producing a filling matrix. FIG. 6 is a partial perspective view of a strip-shaped steel plate used for producing the filling matrix shown in FIG. 5. 1... Flat strip steel plate, 2... Through hole, 3...
Corrugated steel plate, 7, 7'...continuous band layer.

Claims (1)

[Claims for Utility Model Registration] 1 Consisting of continuous strip layers 7, 7', which are a combination of a corrugated steel strip 3 capable of forming a layer of catalytic material and flat steel strips 1 stacked on both sides of the corrugated steel strip. A packing matrix for a catalytic reactor for purifying exhaust gas, characterized in that the continuous band-like layer is arranged in a casing in a meandering and folded state. 2. The filling matrix according to claim 1, wherein the continuous band-like layers are folded in a zigzag pattern. 3. The filled matrix according to claim 1, wherein each portion 7a, 7b of the continuous band-like layer has a different length a, b in the bending direction. 4. The filling matrix according to claim 1, wherein a folded portion 9 is provided in advance at a folded portion of the continuous band-like layer. 5. The filled matrix according to claim 4, wherein the folded portions 9 are constructed as perforations. 6. The filling matrix according to claim 1, wherein the flat steel strip 1 is provided with through holes 2. 7 The opening cross-sectional area of all the through holes 2 is the same as that of the individual layer 7
Boundary surface 1 forming a boundary between A and 7B
7. The filling matrix according to claim 6, which occupies 5% or more of the filling matrix.