DE2201990B2 - Device for the catalytic conversion of exhaust gases for their detoxification - Google Patents

Description

30th

The invention relates to a device for the catalytic conversion of exhaust gases for their Detoxification according to the preamble of claim 1.

Such a device is known from US-PS 3149 925, wherein the K jtalysatorbehälter extends obliquely through the jacket. The two ends of the catalyst container are firmly connected to the jacket in a gas-tight manner. Since, however, arise in these devices because of exothermic chemical reactions high temperatures occur considerable * o thermal expansions in particular in the walls of the catalyst container. Such thermal expansions cannot be compensated for in the known device.

The invention is used in a device of the <s The type specified in the preamble of claim 1 solved the problem in connection with a subdivision of the catalyst container a particularly simple sliding connection to compensate for thermal expansion of the catalyst container to be provided. ή>

This is achieved according to the invention by the characterizing features in claim 1

By dividing the catalyst container into two catalyst chambers and utilizing the End cap of one catalyst chamber for sliding support of the walls of the other catalyst chamber an easy to assemble, two-chamber catalytic converter converter that is durable in operation is created. This connection between the two otherwise independent catalyst chambers is particularly suitable for an inclined arrangement of the two catalyst chambers in the Jacket of the device. By sliding the walls of one chamber on the end cap The other chamber has a very simple construction, in which the chambers except for the facing end caps can be completely identical to one another, so that the This considerably reduces manufacturing costs

A catalytic two-chamber exhaust gas converter in which the exhaust gas flows through the chambers is known per se (US-PS 31 80 712). Here, too, in one embodiment, there is a sliding support for the chambers to compensate for Thermal expansion provided. However, the chambers are each from one end of the shell attached cantilevered and not connected to each other with their adjacent ends, the sliding support is provided by sliding elements attached to the bottom of the shell, so that each The chamber for itself is stored in the jacket of the device and is a gas-tight connection between the adjacent ones Ends are missing

Also is a catalytic exhaust converter with cross-flow! Catalyst container known per se (US-PS 27 76 875), which to compensate for thermal changes in length in its longitudinal direction is divided into several container sections, which are, however, in open communication with each other and have at their ends facing perpendicularly angled flanges, which are under training an expansion gap at a distance from one another, so that a sliding support of the container sections The container sections are also firmly riveted to longitudinal struts that thermal expansions can only be compensated for stress-free for the walls of the container sections can, if there is the same thermal expansion in terms of size and direction for the longitudinal struts is due to the sliding support provided according to the invention between the two catalyst chambers achieved that occurring in the catalyst chambers thermal expansion regardless of which are directly compensated for in other built-in components.

In a preferred embodiment of the invention, the catalyst chambers are with their bottom walls Slidably supported on struts arranged laterally at a distance from one another in the jacket additional sliding support on the struts is the free stretchability of the catalyst chambers More secure guaranteed, the strut support also contributes to a jamming of the sliding connection the two end caps of the catalyst chambers.

The invention is explained below with reference to a preferred embodiment, wherein on the drawing is referred to. In the drawing shows

l · i g. 1 shows a vertical longitudinal section along the central axis of the device,

2 shows a horizontal section along the line 2-2 in Fig. I,

Figure 3 is a cross section taken along line 3-3 in Fig. 1. and

Figure 4 is a cross section taken along line 4-4 in Fig. 1.

As shown in the drawing, there is the device for the catalytic conversion of exhaust gases in an elongated jacket with the outer wall 12 and the inner wall 10, which are in a certain A thermal insulating layer 15 enclosing between them are arranged at a distance from one another. the Ends of the walls 10 and 12 contact each other and are provided with two closure caps 20, e.g.

customary knurled border 18, firmly connected, whereby the opposite end faces of the jacket are closed.

Two deflector plates 22 are in the interior of the jacket at a small distance from the closure caps 20 attached Each of the deflector plates has an opening 24 with a shoulder-like edge that is axially aligned with an opening 26 with a shoulder-like edge is arranged in the closure caps 20 in the openings 24 and 26 is a ι ο gas inlet line 28 at one end of the Um converter, and one at the opposite end Gas outlet line 30 attached. Each of the baffle plates 22 has a number of air vents 31. The gas inlet line 28, like the gas outlet line 30, end within the deflector plates 22

Inside the device are two catalyst chambers 33 and 34 at a certain distance from the Abweispktten 22 attached The catalyst chambers are to accommodate a catalytic material for the Detoxification of the exhaust gases provided when the gases from the inlet line 28 to the outlet line 30 through the Chambers flow.

As can be seen from the drawing, the catalyst chambers 33 and 34 are essentially structured identical. Each of the chambers has an elongated top wall 37 and an elongated bottom wall 38, which are connected by means of two side walls 39 without openings. The ceiling and floor walls show rows of openings 40, each arranged in the longitudinal direction, to allow the flow through the chambers to allow with gas. The front end of the chamber 33, which is located adjacent to the inlet conduit 28, is closed by an end cover 42. The end cover 42 has an end wall 44 without openings across the chamber and a flange-like edge 45 which is directed towards the gas inlet and which is offset on one side The opposite end of the chamber 33 is closed by a gas-impermeable end cap 46 which is connected within the end of the chamber to its top, bottom and side walls The rear end of the chamber 34, which is located adjacent to the outlet conduit 30, is through a End cover 49 closed, which has a gas-impermeable end wall 50 across the chamber 34 and back has a flange-like edge 52 which protrudes towards the gas outlet and is offset on one side from that of the chamber 33 adjacent end of the chamber 34 is closed by an end cap 47 without openings, which with the Top and bottom wall and connected to the side walls of the chamber 34 is ».

The catalyst chambers 33 and 34 are located diagonally inside the device. You are with theirs End covers 42 and 49 fixedly connected to the inner wall 10 of the jacket. For this purpose, the flange-like protrudes Edge 45 on the sides and on the bottom of the chamber 33 ″ beyond the edge of the chamber and is in the area 55 laterally outward on the sides of the chamber, and downward in area 56 at the bottom of the chamber recessed The outwardly recessed areas 55 and 56 of the edge 45 are curved so that they are at the opposite parts of the inner wall 10 of the jacket and are firmly connected to these. The flange-like edge 52 on the sides and on the top of the chamber 34 protrudes above the rear Edge of the chamber 34 and is in the area 57 on the sides of the chamber laterally outward, and in the Area 58 at the top of the chamber to the top remote Just like the remote areas 55 and 56, the remote areas 57 and 58 of the flange-like edge 52 curved so that they are attached to the adjacent parts of the inner wall 10 of the jacket rest, and are firmly connected to these. To this Way prevent the recessed areas 55 to 58 according to Figure 2 a gas flow along the sides of the Chambers 33 and 34. The catalyst chambers 33 and 34 are displaceable at their adjacent ends connected to each other to expand and contract both against each other and in relation to each other to allow on the jacket in the event of temperature changes in the converter. To this end, the end cap 47 protrudes with its edge region 60 over the top and bottom walls 37 and 38 and over the side walls 39 of the Chamber 34 out. The rear edges of the top, bottom and side walls 37-39 of chamber 33 are Slidably displaceable over the protruding edge region 60. In this way, the ceiling and the bottom wall and the side walls of the chamber 34 are the extension of the corresponding walls of the Chamber 33 and allow dev. an expansion and contraction of the chambers against each other.

It is advantageous if the adjoining top and bottom walls 37 and 38 of the chambers 33 and 34 are oppositely congruent. The Oberkai! '? the chamber 34 opposite the outlet line 30 has an arcuate cross-section corresponding to the curvature of the upper part of FIG Inner wall 10 of the jacket. The cross section flattens out in the direction of that adjacent to the inlet End of the chamber 33 up to the straight line. Conversely, the edge of the bottom surface 38 faces the chamber 33 opposite the inlet line 28 has an arcuate cross section, which in the direction of the outlet line 30 adjacent end of the chamber 34 flattened to the straight line Since the chambers are diagonally inside the Device lying is due to the oppositely congruent shape of the ceiling and floor walls the chambers an inlet space and an outlet space created for the chambers through which a more uniform Gas flow through the chambers is assured to detoxify the gas flow in the most effective way to be able to.

In the embodiment shown in the drawing, the catalyst chambers 33 and 34 are on a number of longitudinally extending wedge-shaped struts 68 slidably supported the have a certain distance from each other sideways. The struts 68 are between the bottom wall 38 each of the chambers 33 and 34 and the lower part of the inner wall 10 of the jacket V-shaped struts has two wall parts 70. Your vertex lies on the BDdenwand 38 of the chambers between two adjacent rows of openings 40 movable to. The lower ends of the wall parts 70 run into finger-like projections 71 that diverge to the side, which are firmly connected to the inner wall of the jacket. Because of the inclined arrangement of the chambers it takes the height of the wall portions 70 of the struts 68 from the end adjacent the inlet conduit 28 towards the the outlet line 30 adjacent end steadily.

In the wall parts 70 of the struts: »A number of openings 72 can be made around the Evenly distribute the gas flow after leaving the chambers.

According to Figure 3, the chambers 33 and 34 are in the Inner jacket 10 additionally for expansion and contraction by means of folded edges 73 at the corners

guided between the side walls 39 and the top and bottom walls 37 and 38, the folded edges 73 protrude obliquely outwards from the chambers.

The folded edges engage slidably in inwardly open longitudinal beads 75, which are essentially extend along the entire length of the sheath.

The folded edges 73 and the longitudinal beads 75 can also be omitted. The side walls of the catalyst chambers are then curved and lie on the adjacent parts of the inner wall 10 of the shell.

For this purpose 3 sheets of drawings

Claims (2)

1 claims: 1. Device for the catalytic conversion of exhaust gases for their detoxification, with an in an elongated jacket, at the ends of which gas inlet and gas outlet lines open Catalyst container, which has gas-permeable bottom and top walls, not gas-permeable Has side walls and non-gas-permeable end caps, with its ends attached to the jacket is ι ο and is connected to the jacket with its side walls in a gas-tight manner, characterized in that that the tCatalyst container is in two catalyst chambers (33, 34) is subdivided, at their ends facing each other, by non-gas-permeable End caps (46, 47) are closed, and that the end cap (47) of a catalyst chamber (34) protrudes from this and the ends of the bottom, top and side walls of the other catalyst chamber (33 * sliding on this end cap (47) propped them up. 2. Device according to claim 1, characterized in that that the catalyst chambers (33, 34) with their bottom walls (38) on the side at a distance struts (68) arranged in the jacket (10, 12, 15) are slidably supported.