JP6513592B2 - Catalyst unit and exhaust gas catalyst - Google Patents

Description

  The invention relates to a catalytic unit based on the preamble of claim 1. The invention further relates to an exhaust gas catalyst.

  The catalytic unit for the exhaust gas catalyst comprises a plurality of catalytic modules. Each catalyst module comprises a ceramic catalyst body which is flowed by means of the exhaust gas and a metallic, rectangular cross-section housing for the ceramic catalyst body, which is also called canning. The housings of the respective catalyst modules contain the respective catalyst bodies, and partially surround the catalyst bodies, and more specifically, openly surround the flow-through end of the catalyst bodies, in this case: One throughflow end is at the inflow end of the respective catalyst body and the other throughflow end is at the outflow end.

  In catalytic units known from practice, the catalytic modules are arranged in an array in the form of a plurality of rows and stages, in which case the directly adjacent catalytic modules are made of their metal and have a rectangular cross section. In the area of the housing, in particular, they are fixedly connected by welding. If one catalyst module has to be replaced in one catalyst unit, this weld connection has to be removed, for example by grinding, which may damage the adjacent catalyst module. Therefore, it is disadvantageous to connect adjacent catalyst modules by welding.

  Therefore, there is a need for a catalyst unit for the catalyst, which allows the catalyst module to be replaced more easily.

  Starting from this, the problem underlying the present invention is to provide a new catalytic unit for the exhaust gas catalyst and an exhaust gas catalyst equipped with such a catalytic unit.

  This task is solved by the catalyst unit according to claim 1. According to the invention, the catalyst module is positioned on the support grid by the first throughflow end, and the opposite retainer is positioned on the opposite second throughflow end of the catalyst module . The catalyst module is clamped between the support grid and the counter holder. The counter holder comprises a plurality of counter holding bars running parallel to one another, the counter holding bar being in contact at a first end with the exhaust gas catalyst housing structure and on the opposite second side At its end, it cooperates with a presser bar that extends perpendicularly to the counterbar. The opposing retaining bars are connected at their second ends to the presser retaining bars by means of axially extending connecting means of the opposing retaining bars, which as a result of the connection also the opposing retaining bars have their first The ends are connected to push the structural elements of the housing structure. The invention enables simple and trouble-free replacement of the catalyst module of the catalyst unit without risk of damage to the adjacent catalyst module and secure clamping of the catalyst module between the support grid and the counter holder. Allow for tightening.

  According to an advantageous variant, the opposing retaining bars push the inclined contour of the structural elements of the housing structure by their first ends, in particular in this case the opposing retaining bars have their first ends. Press the clamping force on the catalyst module in the area of the part. In this way, the catalyst module can be clamped particularly advantageously between the support grid and the counter-holder.

  According to a further advantageous variant, in order to clamp the catalyst module between the support grid and the counter holder, the area of their second ends on all the counter bars by means of the presser bar You can apply power within. In this way, the catalyst module can be clamped particularly advantageously between the support grid and the counter-holder.

  Preferably, a clamping force can be applied by means of a press on the presser-retaining bar, which on the one hand abuts on the presser-retaining bar and on the other hand on the housing structure of the exhaust gas catalyst. In this way, the catalyst module can be clamped particularly advantageously between the support grid and the counter-holder.

  According to a further advantageous variant, the spring element resiliently supports the hold-down bar in the exhaust gas catalyst housing structure and / or the counter-hold bar in the catalyst module and / or the hold-down bar. . This elastic strut support is advantageous to compensate for temperature induced expansion.

  An exhaust gas catalyst according to the invention is defined in claim 9.

  Preferred variants of the invention are evident from the dependent claims and the following description. Exemplary embodiments of the invention will be described in more detail on the basis of the drawings, without being restricted thereto.

FIG. 1 shows a perspective view of a catalyst unit according to the invention for exhaust gas catalysts. It is sectional drawing of the catalyst unit of FIG. FIG. 2 shows the catalyst unit of FIG. 1 without the counter holder. It is a figure which shows the opposing holding tool of the catalyst unit of FIG. Figure 2 shows detail V of figure 1; Figure 2 shows detail VI of figure 1;

  The present invention relates to a catalyst unit and an exhaust gas catalyst for an exhaust gas catalyst of an internal combustion engine for marine or marine applications. In particular, the catalytic unit according to the invention is configured as an SCR catalytic unit for the SCR exhaust gas catalyst of a marine diesel internal combustion engine. 1 to 6 show various views and details of one preferred exemplary embodiment of a catalyst unit.

  The catalytic unit 10 according to the invention comprises a plurality of catalytic modules 11, which are positioned directly one after the other in an array in the form of stages and rows. Each catalyst module 11 includes a metal housing 12 that accommodates a ceramic catalyst body (not shown). The metal housings 12 are rectangular in cross section in the exemplary embodiment shown, and these housings 12 partially surround the outside of the rectangular catalyst body. The housing 12, also called canning, opens the catalyst body so that at its opposite end, the inflow end and the outflow end of the respective catalyst module 11 are formed.

  The catalyst unit 10 comprises a support grid 13. The catalyst module 11 stands on the support grid 13 in the region of the first flow-through end. At the opposite, second through-flow end of the catalyst module 11, the counter holder 14 is positioned, and the catalyst module 11 is clamped between the support grid 13 and the counter holder 14.

  As best seen in FIG. 1, the support grid 13 is parallel to the plurality of parallelly running first support bars 15a and parallel to one another and perpendicular to the first support bars 15a. And a second support bar 15b running on which the catalyst module 11 is positioned.

  Each of the sealing elements 16 (FIG. 6) is mounted between the support bars 15a or 15b which run directly parallel to one another of the support grid 13 on which the directly adjacent catalyst modules 11 are positioned. See, for example, this sealing element prevents exhaust gas flow between the housings 12 of the catalyst modules 11 that are directly adjacent. Thus, in FIG. 6 there is shown a gap 17 between the two directly adjacent housings 12 of the catalyst module 11, for which the sealing element 16 blocks the exhaust gas flow through this gap 17 and thus all Of the exhaust gas flow through the catalytic body of the catalytic module 11. The sealing element 16 visible in FIG. 6 is positioned on a U-profiled section beam 18 which runs parallel to one another in the support grid 13 in FIG. It is positioned between the supporting bars 15b.

  As can be seen from FIG. 6, the housing 12 of the catalyst module 11 is provided at its first throughflow end with curved or bent edged support legs 19 which are sealed It is braced against the element 16, ie stands on this sealing element. If the wall thickness of the canning is large enough at the ends, the edges need not be bent. To that end, the wall thickness should be between 2 mm and 20 mm. In FIG. 6, a gap 20 is formed between the support bars 15 a and 15 b and the first throughflow end of the catalyst module 11, and this gap is a catalyst between the support grid 13 and the facing holder 14. It is preferable not to clamp the module 11.

  As can be seen from FIG. 6, each catalyst module 11 and the individual support bars 15a, 15b of the support grid 13 cooperate. In the free space defined between the directly adjacent support bars 15a or 15b, in which the sealing elements 16 are positioned, the catalyst modules 11 are engaged by their support legs 19. In this way, the support bars 15a, 15b running parallel to one another provide individual tolerance corrections to the dimensional tolerances of the catalyst module 11, so that the individual tolerances of the adjacent catalyst modules 11 are not accumulated. Thereby, the catalyst unit 10 according to the invention can be incorporated particularly advantageously into the housing structure of the exhaust gas catalyst.

  As already described in detail, the catalyst module 11 is clamped between the support grid 13 and the counter holder 14. The counter holder 14 comprises a plurality of counter holding bars 21 running parallel to one another. Each of the opposing holding bars 21 abuts on the exhaust gas catalyst housing structure 27 a by means of the first end 22, and on the opposite second end 23 the opposing holding bars 21 and these opposing holding bars In cooperation with the vertically extending presser bar 24.

  In order to clamp the catalyst module 11 between the support grid 13 and the facing holder 14, a clamping force can be applied on the facing holding bar 21 by means of the pressure holding bar 24. By this clamping force, the counter retaining bar 21 is pushed against the housing 12 of the catalyst module 11 and consequently the catalyst module 11 is pushed against the support grid 13, whereby the support grid 13 and the counter holder Clamping of the catalyst module 11 is carried out between 14 and 14.

  Opposite retaining bars 21 extending along two rows or stages of the catalyst module 11 positioned directly next to one another are pressed onto the catalyst modules 11 of these directly adjacent rows or stages. ing. Only the outer counter retaining bar 21 is pressed onto the catalyst module 11 of only one row or stage.

  The clamping force to be exerted on the countering holding bar 21 of the countering holder 14 by the holder holding bar 24 is provided by the two pushers 26 in the illustrated exemplary embodiment, which are It is attached to the opposite end of the retaining bar 24. Each pusher 26 bears by its first end on the presser-retaining bar 24 and at its second end on the housing structure 27b of the catalyst housing and in this respect cooperates with the pusher 26 The nut 28 makes it possible to adjust the distance between the housing structure 27b and the presser bar 24 and thus the clamping force.

  The counter retaining bars 21 are connected at their second ends 23 to the presser retaining bars 24 by means of an axially extending connecting means 25 of the counter retaining bars 21 which, as a result of the connection, also faces the counter retaining bars. 21 are connected by their first end 22 to push the structural element 29 of the housing structure 27a. As best seen in FIG. 5, the coupling means 25 extend through the flange portion 30 at the second end 23 of each opposing holding bar 21 as well as the presser holding bar 24 common to the opposing holding bar 21. More specifically, it extends in the axial or longitudinal direction of the opposing holding bar 21. By means of this connection, which is preferably realized by means of connecting screws, forces acting in the axial or longitudinal direction of the opposing retaining bars 21 are exerted on the opposing retaining bars 21 so that the opposing retaining bars 21 have their first ends 22. , Push the inclined contour 31 of the structural element 29 of the housing structure 27a. In this case, the counter retaining bars 21 exert a further clamping force on the catalyst modules 11 in the region of their first ends 22 in this case.

  The clamping force required to clamp the catalyst module 11 between the support grid 13 and the countering fixture 14 is therefore, on the one hand, by means of the presser bar 24 and the second end 23 of the counterbar 21 on the other side. In that case, it is applied on the housing 12 of the catalyst module 11 by the first end 22 of the countering holding bar 21 via the cooperation of the coupling means 25 and the structural elements 29 of the housing structure 27a and the facing holding bar 21.

  According to an advantageous variant of the invention, the counter-holder 14 resiliently bears against the housing structure 27b and, in particular, the area of the pusher 26 between the presser-retaining bar 24 and the housing structure 27b. It is supported in tension via a spring element 32 which is supported in tension internally.

  Likewise, the catalyst unit 10 can be resiliently supported by spring elements (not shown) mounted between the support grid 13 and the housing structure 27c of the catalyst housing of the exhaust gas catalyst.

  Furthermore, a spring element (not shown) can be provided which elastically supports the counter retaining bar 21 resiliently against the housing 12 and / or the presser retaining bar 24 and / or the housing structure 29 of the catalyst module 11.

  Such a spring element makes it possible to offset the change in geometry of the catalyst unit 10 due to temperature cycling. In addition to this, the counter-holder can be implemented elastically, in particular by using spring steel.

  The catalytic unit 10 according to the invention thus comprises a plurality of catalytic modules 11 arranged in an array in stages and rows positioned directly next to one another. The catalyst modules 11 are braced by means of their housing 12 of rectangular cross section by means of the first end on the stationary support grid 13. On the opposite side of the catalyst module 11, a counter holder 14 comprising a plurality of movable counter holding bars 21 and one presser holding bar 24 is arranged. The catalyst module 11 is clamped between the stationary support grid 13 and the movable counter holder 14.

  In order to finally clamp the catalyst module 11 between the support grid 13 and the counter holder 14, each counter retaining bar 21 is fitted by means of the first end 22 against the housing structure 27 a of the exhaust gas catalyst housing. At the second end 23 opposite to the facing holding bar 21, a common holding and holding bar 24 is attached. In this case, the first clamp force can be applied on the pressing and holding bar 24 by the pressing tool 26 and on the second end 23 of the facing holding bar 21 by the pressing and holding bar 24. A second clamping force is applied at the first end 22 of the counterholding bar 21 via the cooperation of the coupling means 25 and the inclined contour 31 of the structural element 29 of the housing structure 27a.

  The contour 31 of the structural element 29 of the housing structure 27a is such that by tightening the connection means 25, the first ends 22 of the counter retaining bars 21 in their axial or longitudinal direction, the structural element of the housing structure 27a, ie the housing structure 27a In contrast to 29, in particular, the more strongly it is pushed against the contour 31 of the structural element 29, the more the first end 22 of the countering retaining bar 21 is pushed so as to push the housing 12 of the catalyst module 11 more strongly doing.

  The thermal expansion of the catalyst unit 10 is preferably offset by the spring elements attached to the support grid 13 and / or the pressure retaining bar 24 and / or the counter retaining bar 21. One alternative to offset the thermal expansion is that the opposing retaining bars 21 and preferably the retaining bars 24 of the opposing retainers 14 are manufactured from an elastic material, in particular from spring steel. In this way, thermal expansion that may possibly occur can be directly received and offset by the counter holder 14.

  Several such catalyst units 10 can be used in one housing of one exhaust gas catalyst.

DESCRIPTION OF REFERENCE NUMERALS 10 catalyst unit 11 catalyst module 12 housing 13 support grid 14 facing holder 15 a support bar 15 b support bar 16 sealing element 17 gap 18 section beam 19 support leg 20 gap 21 facing holding bar 22 end 23 end 24 presser holding bar 25 Connection means 26 pressing tool 27a housing structure 27b housing structure 27c housing structure 28 nut 29 structural element 30 flange portion 31 contour 32 spring element

Claims (9)

Equipped with several catalyst modules (11)
Each of the catalyst modules (11) comprises a ceramic catalyst body which is flowed by means of exhaust gas, and a metallic housing (12) for the ceramic catalyst body,
A catalyst unit (10) for an exhaust gas catalyst, wherein each of said ceramic catalyst bodies is housed within each of said metal housings (12) and partially surrounded by each of said metal housings (12). ), In particular in an SCR catalytic unit for the SCR exhaust gas catalyst of an internal combustion engine,
Said catalyst module (11) is positioned on the support grid (13) by the first flow through end,
A facing holder (14) is positioned at a second through-flow end opposite to the catalyst module (11), the catalyst module (11) comprising the support grid (13) and the facing holder. Clamped between (14) and
The counter-holder (14) comprises a plurality of counter-holding bars (21) running parallel to one another, wherein the counter-holding bar (21) is a housing of the exhaust gas catalyst at a first end (22) Working in conjunction with a pressure retaining bar (24) which abuts on the structure (27a) and which extends at the opposite second end (23) perpendicularly to the counter retaining bar (21) Said counter retaining bars (21), at their second ends (23), by means of an axially extending connecting means (25) of said counter retaining bars (21) and said retaining bars (24) Connected, and as a result of the connection, the opposite retaining bars (21) are connected to push the structural element (29) of the housing structure (27a) by their first end (22) A catalytic unit characterized by   Said opposing retaining bars (21) push the inclined contour (31) of said structural element (29) of said housing structure (27a) by their first end (22), in particular in this case: Catalyst unit according to claim 1, characterized in that the counter retaining bars (21) push in such a way as to exert a clamping force on the catalyst module (11) in the area of their first end (22).   In order to clamp the catalyst module (11) between the support grid (13) and the facing holder (14), the hold down bar (24) on all the facing holding bars (21) Catalyst unit according to claim 1 or 2, characterized in that forces can be applied in the area of their second ends (23).   A clamping force can be exerted on the presser-retaining bar (24) by means of a presser (26), the presser (26) on the one hand on the presser-retaining bar (24) and on the other hand the housing of the exhaust gas catalyst Catalyst unit according to claim 3, characterized in that it is in contact with the structure (27).   5. A device as claimed in any one of the preceding claims, characterized in that a spring element (32) resiliently supports the hold-down bar (24) on the exhaust gas catalyst housing structure (27). Catalytic unit.   A spring element elastically supports the opposing holding bar (21) on the catalyst module (11) and / or the presser holding bar (24) and / or the structural element (29). The catalyst unit according to any one of claims 1 to 5.   A catalyst unit as claimed in any one of the preceding claims, characterized in that the structural element (29) is resiliently mounted relative to the housing structure (27).   Catalyst unit according to any one of the preceding claims, characterized in that the counter-holder (14) is embodied resiliently, preferably from spring steel.   An exhaust gas catalyst comprising a plurality of catalyst units (10) according to any one of the preceding claims.