NO20191182A1 - Exhaust gas catalytic converter - Google Patents

Exhaust gas catalytic converter

Info

Publication number
NO20191182A1
NO20191182A1 NO20191182A NO20191182A NO20191182A1 NO 20191182 A1 NO20191182 A1 NO 20191182A1 NO 20191182 A NO20191182 A NO 20191182A NO 20191182 A NO20191182 A NO 20191182A NO 20191182 A1 NO20191182 A1 NO 20191182A1
Authority
NO
Norway
Prior art keywords
exhaust gas
catalytic converter
gas catalytic
counter
hold
Prior art date
Application number
NO20191182A
Inventor
Mehmet Coskun Baydak
Martin Hauser
Thomas Schlicht
Vivian Reck
Johannes Liepert
Original Assignee
Man Energy Solutions Se
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Man Energy Solutions Se filed Critical Man Energy Solutions Se
Publication of NO20191182A1 publication Critical patent/NO20191182A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/004—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 specially adapted for marine propulsion, i.e. for receiving simultaneously engine exhaust gases and engine cooling water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/18—Construction facilitating manufacture, assembly, or disassembly
    • F01N13/1838—Construction facilitating manufacture, assembly, or disassembly characterised by the type of connection between parts of exhaust or silencing apparatus, e.g. between housing and tubes, between tubes and baffles
    • F01N13/1844—Mechanical joints
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • F01N3/2875—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration by using elastic means, e.g. spring leaves, for retaining catalyst body in the housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2350/00—Arrangements for fitting catalyst support or particle filter element in the housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
    • F01N2590/02—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for marine vessels or naval applications
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Ocean & Marine Engineering (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Description

The invention relates to an exhaust gas catalytic converter according to the preamble of Claim 1.
From DE 10 2015 004 006 A1 and from DE 10 2015 219 827 A1, exhaust gas catalytic converters for diesel internal combustion engines for ships and stationary diesel internal combustion engines are known, in particular SCR exhaust gas catalytic converters.
Accordingly, DE 10 2015 004 006 A1 discloses an exhaust gas catalytic converter with an exhaust gas catalytic converter housing and multiple catalyst modules received in the exhaust gas catalytic converter housing, wherein the catalyst modules form one or more exhaust gas catalytic converter units. Each catalyst module comprises a catalyst body flowed through by exhaust gas and a housing, wherein the respective catalyst body is received in the respective housing and is surrounded by the same in portions. Furthermore, the exhaust gas catalytic converter comprises a support grid and a countersupport comprising multiple counter-support braces running parallel to one another. The catalyst modules are clamped between the support grid and the counter-support braces of the counter-support namely in such a manner that the catalyst modules lie against the support grid with first flowed-through ends and against the counter-support with second flowed-through ends. In addition, the exhaust gas catalytic converter comprises multiple hold-downs. By way of the hold-downs, which support themselves on a housing structure of the exhaust gas catalytic converter, the counter-support braces can be pressed against the second flowed-through ends of the catalyst modules. The hold-downs support themselves with a first end on a housing structure and with a second end on a hold-down brace, wherein the hold-down brace presses the counter-support brace against the second flowed-through ends of the catalyst modules.
There is a need for an exhaust gas catalytic converter which on the one hand is easily assembled and disassembled, and with which on the other hand a defined, uniform force even when passing through temperature cycles can be exerted on the catalyst modules even under operating conditions.
Starting out from this, the present invention is based on the object of creating a new type of exhaust gas catalytic converter. This object is solved through an exhaust gas catalytic converter according to Claim 1.
According to the invention, a hold-down each acts on opposite ends of the respective counter-support brace in the region of each counter-support brace, which with a first portion presses against the respective counter-support brace, which with a second portion projects into a recess of the respective counter-support brace, and which with a third portion extends through a housing structure of the exhaust gas catalytic converter housing extending transversely to the respective counter-support brace.
The respective hold-down comprises a spring element which supports itself on the one hand on the first portion of the respective hold-down and on the other hand on the respective housing structure of the exhaust gas catalytic converter housing. The spring force of the respective spring element presses the first portion against the respective counter-support brace and the second portion into the recess of the respective countersupport brace.
Such an exhaust gas catalytic converter can be easily assembled and disassembled. Furthermore, a defined, uniform force can be exerted on the catalyst modules with such an exhaust gas catalytic converter, namely when passing through thermal temperature cycles.
According to an advantageous further development of the exhaust gas catalytic converter according to the invention, the respective hold-down extends with the third portion completely through the respective housing structure of the exhaust gas catalytic converter housing in each case extending transversely to the respective counter-support brace and projects with a fourth portion on a side of the housing structure of the exhaust gas catalytic converter housing facing away from the counter-support brace relative to the housing structure. By exerting a force on the fourth portion of the respective holddown which is greater than the spring force of the spring element and directed contrary to the same, the first portion of the respective hold-down can be lifted off the respective counter-support brace and the second portion of the respective hold-down can be moved out of the recess of the respective counter-support brace. These details serve for the easy assembly and disassembly of the exhaust gas catalytic converter. Furthermore, these details serve for exerting a defined, uniform force on the catalyst modules.
According to a further advantageous further development of the exhaust gas catalytic converter according to the invention, a spring travel limiter is arranged on the first portion of the respective hold-down, namely on a side facing away from the respective counter-support brace and facing the respective housing structure of the exhaust gas catalytic converter housing, which limits a spring travel directed against the spring force of the spring element. By way of this it can be prevented during the assembly and disassembly of the exhaust gas catalytic converter that the spring elements are damaged.
According to a further advantageous further development of the exhaust gas catalytic converter according to the invention, the respective recess of the respective countersupport brace, into which the second portion of the respective hold-down projects, is larger than the second portion, so that the second portion of the respective hold-down projects into the respective recess with play in the longitudinal direction of the countersupport brace. By way of this, thermally-induced longitudinal elongations of the countersupport braces can be compensated.
Preferentially, the spring elements of the hold-downs are dimensioned in such a manner that in particular when during the operation of the exhaust gas catalytic converter the exhaust gas catalytic converter housing and the catalyst modules are heated to operating temperature, the spring elements exert a spring force on the catalyst modules in the order of magnitude of 50 N to 200 N per catalyst module, in particular in the order of magnitude of 75 N to 150 N per catalyst module. The hold-downs are dimensioned in such a manner that in particular when the exhaust gas catalytic converter is out of operation and the exhaust gas catalytic converter housing and the catalyst modules have cooled down to ambient temperature that force which has to be exerted for releasing the respective hold-down is at least 25% preferentially at least 50% greater than the spring force of the respective spring element. Such dimensioning of the spring elements and hold-downs allows a simple assembly and disassembly of the exhaust gas catalytic converter on the one hand and a defined force can be exerted on the catalyst modules even when passing through temperature cycles on the other hand, in order to prevent unintentional releasing of the same.
Preferred further developments of the invention are obtained from the subclaims and the following description. Exemplary embodiments of the invention are explained in more detail by way of the drawing without being restricted to this. There it shows:
Fig. 1: a schematised lateral view of an exhaust gas catalytic converter according to the invention;
Fig. 2: a schematised plan view of the exhaust gas catalytic converter according to the invention;
Fig. 3: a detail of the exhaust gas catalytic converter of Fig. 1 and 2 in a first state;
Fig. 4 a hold-down of the exhaust gas catalytic converter of Fig. 1 and 2 by itself;
Fig. 5: the detail of Fig. 3 in a second state.
The invention relates to an exhaust gas catalytic converter of an internal combustion engine for ship or marine applications.
In particular, the exhaust gas catalytic converter according to the invention is designed as SCR exhaust gas catalytic converter of a diesel internal combustion engine of a ship.
An exhaust gas catalytic converter 10 according to the invention comprises an exhaust gas catalytic converter housing 11. In the shown exemplary embodiment, the exhaust gas catalytic converter housing 11 comprises multiple side walls 12 and a base wall 13.
The exhaust gas catalytic converter 10, furthermore, comprises multiple catalyst module 14 received in the exhaust gas catalytic converter housing 11. Each of the catalyst modules 14 comprises a preferentially metallic housing and a ceramic catalyst body, wherein the respective catalyst body of the respective catalyst module 14 is received in the respective housing and in portions surrounded by the same. For the sake of a simple representation, catalyst bodies and housings of the respective catalyst module 14 are not shown separately but the catalyst module 14 is shown as a unit in a schematised manner.
The exhaust gas catalytic converter 10 comprises a support grid 15, which in the shown exemplary embodiment forms the base wall 13 of the exhaust gas catalytic converter housing 11, and a counter-support 17 comprises multiple counter-support braces 16 extending parallel to one another. The catalyst modules 14 are clamped between the support grid 13 and the counter-support 17, namely in such a manner that the catalyst modules 14 lie on the support grid 15 with first flowed-through ends and against the counter-support 17, namely the counter-support braces 16 with second flowed-through ends located opposite.
In the shown exemplary embodiment, the catalyst modules 14 have a cuboid contour with a rectangular cross section. The catalyst modules 14 positioned in the exhaust gas catalytic converter housing 11 are arranged in the manner of multiple rows and columns, i.e. in the manner of an array, next to one another and on top of one another. The counter-support braces 16 of the counter-support 17 extend either in the direction of the rows or in the direction of the columns of array of catalyst modules 14 along edges of the catalyst modules 14, wherein in particular when the counter-support braces 16 extend for example in the direction of the rows of the catalyst modules 14, at least some of the counter-support braces 16, namely the middle counter-support braces 16, extend overlappingly over the edges of the catalyst modules 14 of adjacent rows of catalyst modules 14.
The exhaust gas catalytic converter 10 comprises multiple hold-downs 18. By way of the hold-downs 18, which support themselves on housing structures 19 of the exhaust gas catalytic converter housing 11, the counter-support braces 16 of the counter-support 17 can be pressed against the second ends of the catalyst modules 14. In the region of each counter-support brace 16 of the counter-support 17, a hold-down 18 each acts on the ends located opposite one another of the respective counter-support brace 16. Each hold-down 18 comprises a first portion 20 which presses against the respective countersupport brace 16. On a side of the first portion 20 facing the respective counter-support brace 16, a second portion 21 of the hold-down 18 projects relative to the first portion 20, which projects into a recess 22 of the respective counter-support brace 16. Furthermore, the respective hold-down 18 comprises a third portion 23 which extends through the respective housing structure 19 of the exhaust gas catalytic converter housing 11, wherein the respective housing structure 19 extends transversely to the respective counter-support brace 16. This third portion 23 of the respective countersupport 18 extends completely through the respective housing structure 19 of the exhaust gas catalytic converter housing 11 extending transversely to the respective counter-support brace 16 and, with a fourth portion 24, projects on a side of the housing structure 16 facing away from the counter-support brace 16 relative to the housing structure 19 of the exhaust gas catalytic converter housing 11.
In the shown exemplary embodiment, the hold-down 18 with the portions 20, 21, 23 and 24, is a threaded screw with a nut, wherein the nut provides the first portion 20 of the hold-down 18, wherein a threadless shank of the threaded screw provides the third portion 23 of the hold-down 18, wherein a screw head provides the fourth portion 24 of the hold-down 18, and wherein a region of a threaded portion of the screw shank projecting relative to the nut provides the second portion 21 of the hold-down 18.
In addition, the respective hold-down 18 comprises a spring element 25 formed as compression spring. The respective spring element 25 supports itself on the one hand on the first portion 20 of the respective hold-down 18, namely on a side of the first portion 20 facing away from the respective counter-support brace 16, and on the other hand the spring element 25 supports itself on the respective housing structure 19 of the exhaust gas catalytic converter housing 11, namely on a side of the respective housing structure 19 facing the first portion of the hold-down 18. The receptive housing structure 19 is designed as cross beam to the respective counter-support brace 16. The spring element 25 of the respective hold-down 18 provides a spring force which presses the first portion 20 of the hold-down 18 against the respective counter-support brace 16 of the countersupport 17 and thus the second portion 21 of the respective hold-down 18 into the corresponding recess 22 of the respective counter-support brace 16.
By exerting a force on the fourth portion 24 of the respective hold-down 18, which is greater than the spring force of the spring element 25 of the respective hold-down 18 and directed opposite to the same, the first portion 20 of the respective hold-down 18 can be lifted off the respective counter-support brace 16 and the second portion 21 of the respective hold-down 18 can be moved out of the recess 22 of the respective counter-support brace 16 so that individual catalyst modules 14 can then be easily assembled and disassembled.
Fig. 5 shows a corresponding tool 26 in a highly schematised manner, which acts on the fourth portion 24 of the respective hold-down 16 in order to exert a force counteracting the spring force of the spring element 25 on the respective hold-down 18.
As already explained, the second portion 21 of the respective hold-down 18 engages in a corresponding recess 22 of the respective counter-support brace. This recess 22 of the counter-support brace 16 is dimensioned in such a manner that the same is larger than the second portion 21, so that accordingly the second portion 21 projects into the respective recess 22 with play in the longitudinal direction of the counter-support brace 16, as a result of which during the operation in particular thermally-induced longitudinal changes of the counter-support brace 16 can be compensated.
A spring travel limiter 27 is arranged on the first portion 20 of the respective hold-down 18 on a side facing away from the respective counter-support brace 16 and facing the housing structure 19. In particular when in terms of Fig. 5 a force counteracting the spring force of the spring element 25 is exerted on the respective hold-down 18 via the tool 26, the spring travel limiter 27 limits a spring travel of the spring element 25 directed against the spring force of the spring element 25, in order to thereby avoid damaging the same.
In the shown exemplary embodiment, the spring travel limiter 27 is formed as disc 28 with at least one projection 29, wherein the discs 28 extend transversely to the spring travel of the spring element 25 and the or each projection 29 extends in the direction of the spring travel of the spring element 25. The projection 29 can extend for example cylindrically or sleeve-like about the edge of the disc 28.
In Fig. 3 and 5, a spring travel element 25 is visualised in each case by a dimension Y. This dimension Y corresponds to the current distance between the first portion 20 of the respective hold-down 18 and the housing structure 19, through which the respective hold-down 18 extends with its third portion 23. A dimension X visualises a distance between the first flowed-through end of the catalyst modules 14 and a side of the respective counter-support brace 16 facing away from the catalyst modules 14.
During the operation, the housing 11 of the exhaust gas catalytic converter 10 and also the catalyst modules 14 are subject to a thermally-induced elongation or dimension change. The hold-downs 18 are preferentially dimensioned in such a manner, in particular the length of the second portion 21 of the respective hold-down 18, so that when the exhaust gas catalytic converter is out of operation and the exhaust gas catalytic converter housing 11 and the catalyst modules 14 have cooled down to ambient temperature, that force that has to be exerted for releasing the respective hold-down 18 via the tool 26 is at least 25%, preferentially at least 50% greater than the spring force of the respective spring element 25, which presses the respective second portion 21 into the respective recess 22. The spring elements 25 of the hold-downs 18 are preferentially dimensioned in such a manner that in particular when during the operation of the exhaust gas catalytic converter the exhaust gas catalytic converter housing 11 and the catalyst modules 14 are each heated to operating temperature, the spring elements 25 of all hold-downs 18 in their entirety exert a spring force on the catalyst modules 14 in the order of magnitude of 50 N to 200 N per catalyst module 14, in particular in the order of magnitude of 75 N to 150 N per catalyst module 14. By way of this, on the one hand, in particular when catalyst modules 14 and exhaust gas catalytic converter housing 11 have cooled down to ambient temperature, a simple assembly and disassembly of the catalyst modules 14 can take place, while on the other hand, during the operation, i.e. when exhaust gas catalytic converter housing 11 and catalyst modules 14 are heated to operating temperature, the catalyst modules 14 can be securely clamped between the support grid 15 and the counter-support 17.
List of reference numbers
10 Exhaust gas catalytic converter
11 Exhaust gas catalytic converter housing
12 Side wall
13 Base wall
14 Catalyst module
15 Support grid
16 Counter-support brace
17 Counter-support
18 Hold-down
19 Housing structure
20 First portion
21 Second portion
22 Recess
23 Third portion
24 Fourth portion
25 Spring element
26 Tool
27 Spring travel limiter
28 Disc
29 Projection

Claims (9)

1. An exhaust gas catalytic converter (10), in particular of a diesel internal combustion engine of a ship,
with an exhaust gas catalytic converter housing (11),
with multiple catalyst modules (14) received in the exhaust gas catalytic converter housing (11), wherein each catalyst module (14) comprises a catalyst body flowed through by exhaust gas and a housing for the catalyst body, wherein the respective catalyst body is received in the respective housing and surrounded by the same in portions,
with a support grid (15) and a counter-support (17) comprising multiple countersupport braces (16) extending parallel to one another, wherein the catalyst modules (14) are clamped between the support grid (15) and the counter-support (17) in such a manner that the catalyst modules (14) with first flowed-through ends lie against the support grid (15) and second flowed-through ends located opposite against the counter-support (17),
with multiple hold-downs (18), which act on housing structures (19) of the exhaust gas catalytic converter housing (11) and press the counter-support braces (16) of the counter-support (17) against the second flowed-through ends of the catalyst modules (14), characterized in that
a hold-down (18) each acts in the region of each counter-support brace (16) on ends of the respective counter-support brace (16) located opposite, which with a first portion (20) presses against the respective counter-support brace (16), which with a second portion (21) projects into a recess (22) of the respective countersupport brace (16), and which with a third portion (23) extends through a housing structure (19) of the exhaust gas catalytic converter housing (11) extended transversely to the respective counter-support brace (16),
in that the respective hold-down (18) comprises a spring element (25), which supports itself on the one hand on the first portion (20) of the respective holddown (18) and on the other hand on the respective housing structure (19) of the exhaust gas catalytic converter housing (11).
2. The exhaust gas catalytic converter according to Claim 1, characterized in that the respective hold-down (18) extends with the third portion (23) completely through the respective housing structure (19) of the exhaust gas catalytic converter housing (11) extending transversely to the respective counter-support brace (16) and with a fourth portion (24) projects on a side of the housing structure (19) of the exhaust gas catalytic converter housing (11) facing away from the countersupport brace (16) relative to the housing structure (19).
3. The exhaust gas catalytic converter according to Claim 1 or 2, characterized in that the spring force of the respective spring element (25) presses the first portion (20) against the respective counter-support brace (16) and the second portion (20) into the recess (22) of the respective counter-support brace (16).
4. The exhaust gas catalytic converter according to Claim 2 and 3, characterized in that by exerting a force on the fourth portion (24) of the respective hold-down (18), which is greater than the spring force of the spring element (25) and counter-directed to the same, the first portion (20) of the respective hold-down (18) can be lifted off the respective counter-support brace (16) and the second portion (21) of the respective hold-down (18) can be moved out of the recess (22) of the respective counter-support brace (16).
5. The exhaust gas catalytic converter according to any one of the Claims 1 to 4, characterized in that the respective recess (22) of the respective counter-support brace (16), into which the second portion (21) of the respective hold-down (18) projects, is greater than the second portion (21), so that the second portion (21) projects into the respective recess (22) with play in the longitudinal direction of the counter-support brace (16).
6. The exhaust gas catalytic converter according to any one of the Claims 1 to 5, characterized in that on the first portion (20) of the respective hold-down (18), namely on a side of the first portion (20) facing away from the respective countersupport brace (16) and facing the respective housing structure (19) of the exhaust gas catalytic converter housing (11), a spring travel limiter (27) is arranged, which limits a spring travel directed against the spring force of the spring element
7. The exhaust gas catalytic converter according to Claim 6, characterized in that the spring travel limiter (27) is formed as a disc (28) with at least one projection (29), wherein the disc (28) extends transversely to the spring travel and the or each projection (29) in the direction of the spring travel.
8. The exhaust gas catalytic converter according to any one of the Claims 1 to 7, characterized in that the spring elements (25) of the hold-downs (18) are dimensioned in such a manner that in particular when the exhaust gas catalytic converter housing (11) and the catalyst modules (14) are heated to operating temperature, the spring elements (25) exert a spring force on the catalyst modules (14)in the order of magnitude of 50 N to 200 N per catalyst module, in particular in the order of magnitude of 75 N to 150 N per catalyst module.
9. The exhaust gas catalytic converter according to any one of the Claims 1 to 7, characterized in that the hold-downs (18) are dimensioned in such a manner that in particular when the exhaust gas catalytic converter housing (11) and the catalyst modules (14) have cooled down to ambient temperature, that force that has to be exerted for releasing the respective hold-down (18) is at least 25%, preferentially at least 50% greater than the spring force of the respective spring element (14).
NO20191182A 2018-10-04 2019-10-03 Exhaust gas catalytic converter NO20191182A1 (en)

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CN (1) CN111005791B (en)
CH (1) CH715416B1 (en)
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DE102018124468A1 (en) 2020-04-09
KR20200038850A (en) 2020-04-14
CN111005791B (en) 2022-11-15
CH715416B1 (en) 2023-04-28
FI20195812A1 (en) 2020-04-05
CH715416A2 (en) 2020-04-15
CN111005791A (en) 2020-04-14
KR102601852B1 (en) 2023-11-13

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