EP0840840B1 - A catalyst carrier arrangement - Google Patents
A catalyst carrier arrangement Download PDFInfo
- Publication number
- EP0840840B1 EP0840840B1 EP96911153A EP96911153A EP0840840B1 EP 0840840 B1 EP0840840 B1 EP 0840840B1 EP 96911153 A EP96911153 A EP 96911153A EP 96911153 A EP96911153 A EP 96911153A EP 0840840 B1 EP0840840 B1 EP 0840840B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- monolith
- casing
- metal
- catalyst body
- 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.)
- Revoked
Links
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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 constitute 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.
- US 4,909,994 discloses a carrier arrangement for catalytic converters comprising a catalyst body which consists of a monolith of carrier members designed to support a catalytic material, said carrier members formed by superposed, alternately flat and corrugated metal foils which are helically wound to form through-flow channels extending through the catalyst body, and of a metal casing, the material thickness of which exceeds that of the metal foils and which casing encloses the monolith, whereby the interior width of the casing exceeds that of the monolith, whereby a gap forms between the casing and the monolith, and said gap is bridged at least in the area of a section by a radial bandlike depression of the casing extending circumferentially around the monolith.
- the subject invention provides a simple, reliable and economical solution to the securement problem.
- the solution functions both when applied to metal monoliths soldered together in the manner indicated above and when applied to metal monoliths joined together in some other manner, without soldering.
- the characteristic features of the attachment arrangement appear from the appended claims.
- 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 monolith 3 When the monolith 3 is heated by the exhaust gases flowing through it, the monolith 3 expands quicker than the casing 2, which is due partly to the more intimate contact of the monolith 3 with the hot exhaust gases, partly to the larger material thickness of the casing 2. 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. When the casing and the monolith 3 again cool down, 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.
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)
Description
The subject invention concerns a carrier arrangement
for catalytic converters.
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.
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.
When the hot exhaust gases flow through the monolith
during the combustion engine operation the thin carrier
member foils are heated very rapidly. Usually, the
temperature quickly reaches between 500 and 800°C. In
some types of engines, the temperature may rise to the
range of up to between 1100 and 1200°C. As soon as the
engine stops, the temperature of the catalyst body
rapidly sinks to the level of the ambient temperature.
The repeated temperature changes constitute 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. When the
abovementioned high temperature levels are reached, 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.
When the engine is stopped and the exhausts cool
down the opposite phenomenon occurs, i.e. the monolith
foils cool at a higher speed than the surrounding thicker
casing. As a result, considerable tensile forces generate
between the outermost part of the monolith and the cover.
For the reasons outlined in the aforegoing,
considerable problems are involved as regards the
attachment of metal monoliths in their casings. Several
various solutions have been proposed and tested, but
often with poor results. Some viable constructions have
been developed, e.g. by the German company Emitec GmbH,
but they are comparatively complex and expensive. A
feature common to all these prior-art solutions is that
they apply to monoliths wherein the various metal foil
layers are interconnected by means of soldering, with the
outermost layer being soldered to the surrounding jacket.
US 4,909,994 discloses a carrier arrangement for
catalytic converters comprising a catalyst
body which consists of a monolith of carrier members
designed to support a catalytic material, said carrier
members formed by superposed, alternately flat and
corrugated metal foils which are helically wound to form
through-flow channels extending through the catalyst
body, and of a metal casing, the material thickness of
which exceeds that of the metal foils and which casing
encloses the monolith, whereby the interior width of the
casing exceeds that of the monolith, whereby a gap forms
between the casing and the monolith, and said gap is
bridged at least in the area of a section by a radial
bandlike depression of the casing extending
circumferentially around the monolith.
The subject invention provides a simple, reliable
and economical solution to the securement problem. The
solution functions both when applied to metal monoliths
soldered together in the manner indicated above and when
applied to metal monoliths joined together in some other
manner, without soldering. The characteristic features of
the attachment arrangement appear from the appended
claims.
The invention will be described in closer detail in
the following with reference to the accompanying drawing,
wherein
In accordance with the invention, 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. Along these depressions 7 the casing 2
and the monolith 3 are interconnected, preferably only at
spaced intervals 8, for instance by means of soldering or
welding.
When the monolith 3 is heated by the exhaust gases
flowing through it, the monolith 3 expands quicker than
the casing 2, which is due partly to the more intimate
contact of the monolith 3 with the hot exhaust gases,
partly to the larger material thickness of the casing 2.
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. When the casing and the
monolith 3 again cool down, the monolith 3 may again
retract and thus again open up a gap 6.
Because the monolith 3 is exposed only to minor
local deformations in the area of the depressions 7 and
is allowed to expand and contract freely elsewhere, 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 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.
The invention is not limited to the embodiments as
shown and described but could be modified in a variety of
ways within the scope of the appended claims.
Claims (2)
- A carrier arrangement for catalytic converters, comprising a catalyst body (1) which consists of a monolith (3) of carrier members designed to support a catalytic material, said carrier members formed by superposed, alternately flat and corrugated metal foils (4) which are helically wound to form through-flow channels (5) extending through the catalyst body (1), and of a metal casing (2), the material thickness of which exceeds that of the metal foils (4) and which casing encloses the monolith (3), whereby the interior width of the casing (2) exceeds that of the monolith (3), whereby a gap (6) forms between the casing (2) and the monolith (3), and said gap (6) is bridged at least in the area of a section (7) by a radial bandlike depression of the casing (2) extending circumferentially around the monolith (3),
characterized in that said monolith (3) being soldered or welded to the casing (2) along said section (7). - An arrangement as claimed in claim 1,
characterized in that in the area of said section (7) the monolith (3) is attached to the casing (2) only in some points (8) circumferentially around the monolith.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9501556 | 1995-04-27 | ||
| SE9501556A SE506670C2 (en) | 1995-04-27 | 1995-04-27 | Catalyst mounting arrangement |
| PCT/SE1996/000499 WO1996034188A1 (en) | 1995-04-27 | 1996-04-18 | A catalyst carrier arrangement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0840840A1 EP0840840A1 (en) | 1998-05-13 |
| EP0840840B1 true 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 |
|---|---|---|---|---|
| KR20010005491A (en) * | 1997-03-21 | 2001-01-15 | 닐손 스벤 멜커 | Improvements in catalytic reactors |
| 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 |
| DE60206308T2 (en) * | 2001-02-12 | 2006-03-16 | Ecocat Oy | Process for producing a corrugated sheet 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4909994A (en) * | 1987-07-10 | 1990-03-20 | Nissan Motor Co., Ltd. | Catalytic converter |
| DE3926072A1 (en) * | 1989-08-07 | 1991-02-21 | Behr Gmbh & Co | Catalyser for purifying IC engine exhausts - has circumferential corrugation impressed into jacket surrounding catalyst support matrix |
| 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 |
| US5079210A (en) * | 1989-11-16 | 1992-01-07 | Toyota Jidosha Kabushiki Kaisha | Metallic support for exhaust gas purifying catalyst |
Family Cites Families (2)
| 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 |
| DE8812762U1 (en) * | 1988-10-11 | 1989-06-29 | Emitec Gesellschaft für Emissionstechnologie mbH, 5204 Lohmar | Catalyst with double jacket system |
-
1995
- 1995-04-27 SE SE9501556A patent/SE506670C2/en not_active IP Right Cessation
-
1996
- 1996-04-18 KR KR1019970707550A patent/KR19990008026A/en not_active Application Discontinuation
- 1996-04-18 EP EP96911153A patent/EP0840840B1/en not_active Revoked
- 1996-04-18 WO PCT/SE1996/000499 patent/WO1996034188A1/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 DE DE69629196T patent/DE69629196T2/en not_active Revoked
- 1996-04-18 JP JP8532022A patent/JPH11504094A/en active Pending
- 1996-04-18 CN CN96193516A patent/CN1084429C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4909994A (en) * | 1987-07-10 | 1990-03-20 | Nissan Motor Co., Ltd. | Catalytic converter |
| DE3926072A1 (en) * | 1989-08-07 | 1991-02-21 | Behr Gmbh & Co | Catalyser for purifying IC engine exhausts - has circumferential corrugation impressed into jacket surrounding catalyst support matrix |
| 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 |
| US5079210A (en) * | 1989-11-16 | 1992-01-07 | Toyota Jidosha Kabushiki Kaisha | Metallic support for exhaust gas purifying catalyst |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1182468A (en) | 1998-05-20 |
| SE9501556L (en) | 1996-10-28 |
| WO1996034188A1 (en) | 1996-10-31 |
| DE69629196T2 (en) | 2004-02-19 |
| SE506670C2 (en) | 1998-01-26 |
| SE9501556D0 (en) | 1995-04-27 |
| KR19990008026A (en) | 1999-01-25 |
| DE69629196D1 (en) | 2003-08-28 |
| CN1084429C (en) | 2002-05-08 |
| ES2203689T3 (en) | 2004-04-16 |
| EP0840840A1 (en) | 1998-05-13 |
| JPH11504094A (en) | 1999-04-06 |
| AU5412096A (en) | 1996-11-18 |
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