EP0840840A1 - A catalyst carrier arrangement - Google Patents
A catalyst carrier arrangementInfo
- Publication number
- EP0840840A1 EP0840840A1 EP96911153A EP96911153A EP0840840A1 EP 0840840 A1 EP0840840 A1 EP 0840840A1 EP 96911153 A EP96911153 A EP 96911153A EP 96911153 A EP96911153 A EP 96911153A EP 0840840 A1 EP0840840 A1 EP 0840840A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- monolith
- casing
- gap
- arrangement
- section
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
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
- F01N3/24—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
- F01N3/2842—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration specially adapted for monolithic supports, e.g. of honeycomb type
-
- 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
- F01N2330/00—Structure of catalyst support or particle filter
- F01N2330/02—Metallic plates or honeycombs, e.g. superposed or rolled-up corrugated or otherwise deformed sheet metal
Definitions
- the subject invention concerns a carrier arrangement for catalytic converters.
- metal substrates As substrates to be used to support the catalytic material in internal combustion engine exhaust systems ceramic materials are predominantly used. In latter years, metal substrates have, however, come into use to an increasingly large extent. The advantage of metal substrates is their ability to reach working temperatures more rapidly than do cermamic ones, as accordingly they begin their exhaust gases purification function at an earlier stage after start, which is a most essential feature. Moreover, metal substrates are more efficient thermal conductors, and thus they may be heated more quickly and the risk of local overheating is reduced. In addition, metal substrates support higher temperatures than ceramic ones.
- metal monoliths As carrier members supporting the catalytic material so called metal monoliths are used. These consist of metal foils, preferably of stainless steel, wound into rolls wherein metal foils of flat configuration alternate with metal foils of corrugated configuration, whereby throughflow channels extending through the catalyst body are formed.
- the foil thickness is small, normally only about 0.05 mm.
- the catalyst body also includes a metal cover forming a jacket surrounding the monolith in contact with the latter. The cover thickness may amount to approximately 1 - 1.6 mm.
- the thin carrier member foils are heated very rapidly.
- the temperature quickly reaches between 500 and 800°C.
- the temperature may rise to the range of up to between 1100 and 1200°C.
- the temperature of the catalyst body rapidly sinks to the level of the ambient temperature.
- the repeated temperature changes constitue a problem that affects the catalyst long-term durability.
- the rapidly heated thin foils of the monolith also expand quickly.
- the surrounding casing in abutment against the monolith but not in close contact with the exhausts and in addition having a larger material thickness, is heated and expands at a slower pace. During the heating, the casing thus prevents the monolith from expanding, which gives rise to considerable radial compressive forces that cause deformations to form in the monolith.
- the strength of the metal also is reduced considerably, often down to about 10% of its strength at room temperature, which aggravates the deformations and reduces the monolith life further.
- Fig. 1 is a broken schematical longitudinal sectional view through a catalyst body
- Fig. 2 is a similar schematical longitudinal sectional view through a catalyst body showing a modified arrangement of attachment in accordance with the invention
- Fig. 3 is a larger-scale view of a part of the attachment arrangement in accordance with the invention.
- Fig. 1 illustrates a basic design of the inventive object.
- a catalyst body 1 comprises a metal casing 2 enclosing a so called monolith 3.
- the latter in turn consists of carrier members, designed to support a catalytic material and consisting of helically wound metal foils, arranged so that flat metal foils 4 alternate with corrugated metal foils, so as to form through-flow channels 5 extending through the catalyst body 1.
- the monolith 3 has a width or diameter that is slightly smaller than the internal width of the casing 2. Accordingly, a gap 6 forms between the casing 2 and the monolith 3, the size of which varies within different temperature ranges.
- the casing 2 is provided with at least one band-like depression 7, in accordance with the embodiment illustrated in the drawing figure with two such depressions, the gap 6 around the monolith 3 thus being eliminated in the area opposite said depressions.
- the casing 2 and the monolith 3 are interconnected, preferably only at spaced intervals 8, for instance by means of soldering or welding.
- the expansion may now take place essentially unimpededly, with the exception of in the area of the depressions 7 where a certain deformation of the outermost foil 4 of the monolith 3 will take place. Consequently, no compressive forces will generate along the major part of the surface of the monolith 3.
- the monolith 3 may again retract and thus again open up a gap 6.
- the catalyst body 1 may operate in an intact condition over a longer period than has hitherto been possible, with consequential increase of its serviceable life. Further improvements may be achieved by omitting to join one or some of the outermost foils 4 along the entire foil length to the the foils immediately interiorly thereof but instead joining them to one another at points spaced laterally from the points 8 of attachment. When the monolith 3 cools down, with consequential contraction, the tensile forces at the points 8 of attachment will not be very pronounced because of the resiliency imparted to the outermost foils 4 between their interconnection points. Figs.
- FIG. 2 and 3 illustrate a modification of the mode of attachment in accordance with the invention.
- an exhaust pipe 9 serves as the casing.
- the monolith 3 is provided at each end with a circumferential collar 10 which projects past its associated monolith end and which is attached to the exhaust pipe 9.
- the collars 10 preferably are attached to the monolith 3 at discrete intervals 12.
- the collars 10 bridge a gap 11 formed between the exhaust pipe 9 and the monolith 3, the latter thus, upon heating and cooling, being given a compara- tively free space in which to expand and contract while at the same time it is securely anchored inside the exhaust pipe 9.
- the gap 6 could be eliminated by introduction of one or several inserts between the casing 2 and the monolith 3 instead of by forming depressions 7 in the casing.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Catalysts (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9501556A SE506670C2 (en) | 1995-04-27 | 1995-04-27 | Catalyst mounting arrangement |
SE9501556 | 1995-04-27 | ||
PCT/SE1996/000499 WO1996034188A1 (en) | 1995-04-27 | 1996-04-18 | A catalyst carrier arrangement |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0840840A1 true EP0840840A1 (en) | 1998-05-13 |
EP0840840B1 EP0840840B1 (en) | 2003-07-23 |
Family
ID=20398107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96911153A Revoked EP0840840B1 (en) | 1995-04-27 | 1996-04-18 | A catalyst carrier arrangement |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0840840B1 (en) |
JP (1) | JPH11504094A (en) |
KR (1) | KR19990008026A (en) |
CN (1) | CN1084429C (en) |
AU (1) | AU5412096A (en) |
DE (1) | DE69629196T2 (en) |
ES (1) | ES2203689T3 (en) |
SE (1) | SE506670C2 (en) |
WO (1) | WO1996034188A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE257904T1 (en) * | 1997-03-21 | 2004-01-15 | Kemira Metalkat Oy | CATALYTIC REACTOR |
CN1096542C (en) * | 1997-03-21 | 2002-12-18 | 凯米拉梅塔尔卡特公司 | Improvements in catalytic reactors |
SE9704265L (en) * | 1997-11-21 | 1998-10-19 | Nilcon Eng Ab | Catalyst with cam flange for clamping |
SE522537C2 (en) | 2000-03-21 | 2004-02-17 | Kemira Metalkat Oy | Catalyst support with jacket |
EP1230978B1 (en) * | 2001-02-12 | 2005-09-28 | Ecocat Oy | Method for manufacturing a corrugated metal reactor packing |
JP5080306B2 (en) * | 2008-02-14 | 2012-11-21 | エコキャット オサケユイチア | Improved catalytic reactor |
DE102018201738A1 (en) * | 2018-02-05 | 2019-08-08 | Continental Automotive Gmbh | Catalyst and process for its preparation |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3664361D1 (en) * | 1985-07-25 | 1989-08-17 | Interatom | Mounting device for a metallic flue gas catalyst support body, and method of manufacturing it |
JPH0721855Y2 (en) * | 1987-07-10 | 1995-05-17 | 日産自動車株式会社 | Catalytic converter device |
DE8812762U1 (en) * | 1988-10-11 | 1989-06-29 | Emitec Gesellschaft für Emissionstechnologie mbH, 5204 Lohmar | Catalyst with double jacket system |
DE3926072C2 (en) * | 1989-08-07 | 1994-01-13 | Emitec Emissionstechnologie | Exhaust gas purification catalyst with elastic elements to compensate for longitudinal expansion |
DE3930680A1 (en) * | 1989-09-14 | 1991-03-28 | Behr Gmbh & Co | Radial and axial movements of expanding exhaust purifier - matrix in housing are permitted by fixed and mobile supports incorporating spring strips |
JPH0634927B2 (en) * | 1989-11-16 | 1994-05-11 | トヨタ自動車株式会社 | Metal carrier for exhaust gas purification catalyst |
-
1995
- 1995-04-27 SE SE9501556A patent/SE506670C2/en not_active IP Right Cessation
-
1996
- 1996-04-18 JP JP8532022A patent/JPH11504094A/en active Pending
- 1996-04-18 KR KR1019970707550A patent/KR19990008026A/en not_active Application Discontinuation
- 1996-04-18 AU AU54120/96A patent/AU5412096A/en not_active Abandoned
- 1996-04-18 ES ES96911153T patent/ES2203689T3/en not_active Expired - Lifetime
- 1996-04-18 WO PCT/SE1996/000499 patent/WO1996034188A1/en not_active Application Discontinuation
- 1996-04-18 CN CN96193516A patent/CN1084429C/en not_active Expired - Fee Related
- 1996-04-18 DE DE69629196T patent/DE69629196T2/en not_active Revoked
- 1996-04-18 EP EP96911153A patent/EP0840840B1/en not_active Revoked
Non-Patent Citations (1)
Title |
---|
See references of WO9634188A1 * |
Also Published As
Publication number | Publication date |
---|---|
SE9501556L (en) | 1996-10-28 |
SE9501556D0 (en) | 1995-04-27 |
DE69629196D1 (en) | 2003-08-28 |
DE69629196T2 (en) | 2004-02-19 |
CN1182468A (en) | 1998-05-20 |
AU5412096A (en) | 1996-11-18 |
SE506670C2 (en) | 1998-01-26 |
EP0840840B1 (en) | 2003-07-23 |
ES2203689T3 (en) | 2004-04-16 |
JPH11504094A (en) | 1999-04-06 |
WO1996034188A1 (en) | 1996-10-31 |
CN1084429C (en) | 2002-05-08 |
KR19990008026A (en) | 1999-01-25 |
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