CN118103589A - Honeycomb body with slotted metal foil for exhaust gas aftertreatment - Google Patents

Honeycomb body with slotted metal foil for exhaust gas aftertreatment Download PDF

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Publication number
CN118103589A
CN118103589A CN202280068544.4A CN202280068544A CN118103589A CN 118103589 A CN118103589 A CN 118103589A CN 202280068544 A CN202280068544 A CN 202280068544A CN 118103589 A CN118103589 A CN 118103589A
Authority
CN
China
Prior art keywords
honeycomb body
foil
length
metal foils
width
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.)
Pending
Application number
CN202280068544.4A
Other languages
Chinese (zh)
Inventor
C·施密特
P·希尔特
F·库尔斯
M·福伊特
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vitesco Technologies GmbH
Original Assignee
Vitesco Technologies GmbH
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 Vitesco Technologies GmbH filed Critical Vitesco Technologies GmbH
Publication of CN118103589A publication Critical patent/CN118103589A/en
Pending legal-status Critical Current

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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
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2807—Metal other than sintered metal
    • F01N3/281—Metallic honeycomb monoliths made of stacked or rolled sheets, foils or plates
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/10—Exhaust treating devices having provisions not otherwise provided for for avoiding stress caused by expansions or contractions due to temperature variations
    • 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
    • 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
    • F01N2330/30—Honeycomb supports characterised by their structural details
    • F01N2330/32—Honeycomb supports characterised by their structural details characterised by the shape, form or number of corrugations of plates, sheets or foils
    • 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
    • F01N2330/30—Honeycomb supports characterised by their structural details
    • F01N2330/44—Honeycomb supports characterised by their structural details made of stacks of sheets, plates or foils that are folded in S-form
    • 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
    • F01N2330/60—Discontinuous, uneven properties of filter material, e.g. different material thickness along the longitudinal direction; Higher filter capacity upstream than downstream in same housing

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

The invention relates to a honeycomb body (9) for exhaust gas aftertreatment of an internal combustion engine, wherein the honeycomb body (9) is formed from a plurality of metal foils (1) which are stacked on top of one another and wound around at least one rotation point, wherein the stacked structure is alternately formed from smooth and at least partially structured metal foils (1), wherein the metal foils (1) have a foil width (5) and a foil length (3), wherein the width (5) of the foil (1) extends along a main flow direction of the honeycomb body (9) from a gas inlet side (11) towards a gas outlet side (12), the foil length (3) extending transversely to the main flow direction, wherein at least some of the metal foils (1) have at least a number of notches (2, 13) dividing the respective metal foil (1) into a plurality of sections (8, 14, 17, 18, 20).

Description

Honeycomb body with slotted metal foil for exhaust gas aftertreatment
Technical Field
The invention relates to a honeycomb body for exhaust gas aftertreatment of an internal combustion engine, wherein the honeycomb body is formed from a plurality of metal foils which are stacked on top of one another in a layered structure and wound around at least one rotation point, wherein the layered structure is formed from smooth metal foils and at least partially structured metal foils alternately, wherein the metal foils have a foil width and a foil length, wherein the foil width extends from a gas inlet side towards a gas outlet side in a main flow direction of the honeycomb body, and the foil length extends transversely to the main flow direction.
Background
In order to achieve an exhaust gas aftertreatment of the exhaust gas of an internal combustion engine, in particular for the conversion of harmful substances contained in the exhaust gas, different catalytic converters are installed in the exhaust section. Catalytic converters generally have a honeycomb body that can be flowed through along a plurality of flow channels, the honeycomb body having a catalytically active surface on which the harmful substances chemically react to form harmless products.
A metal honeycomb body is known, which is formed of a plurality of metal foils stacked on one another in a laminated structure and sectioned into prescribed lengths. In this case, the metal foils stacked on top of each other are wound around at least one rotation point, thereby forming a honeycomb body. For the honeycomb body, both smooth, unstructured metal foils and at least partially structured metal foils are used, which are preferably stacked on top of one another alternately. Between the metal foils, so-called cells/cells are formed, which form flow channels of the honeycomb body, which flow channels can flow in the main flow direction from the gas inlet side to the gas outlet side.
The honeycomb body produced in this way, which is also referred to as the carrier body, is subsequently pressed into a housing, which is referred to as the carrier tube, and soldered to it. In known catalytic converter designs, the completely smooth metal foil and the at least partially structured metal foil extend continuously over the entire axial length of the honeycomb body.
The disadvantage of the embodiments known hitherto in the prior art is in particular that: the known honeycombs are designed in one piece along their axial length/axial extent, so that they have only limited flexibility in the axial direction. During rapid heating or rapid cooling, both radial and axial temperature differences occur in the honeycomb body due to the heat capacity of the metal foil and the carrier tube. As a result of this temperature gradient, the honeycomb body generates a torsional load between the cold and hot regions in the axial direction, which is transmitted in the form of tangential shear forces through the metal foil.
In high thermal load applications, a decrease in tangential shear forces when the corresponding yield limit of the metal foil material is exceeded results in plastic deformation of the metal foil. Such deformations occur mainly in the radial edge region of the honeycomb body or in the central region of the honeycomb body, but also in the intermediate region between the central region and the radial edge region. As a result of such plastic deformation, the conversion rate of the catalytic converter may be lowered due to exfoliation of the catalytically active coating. Furthermore, engine power may be adversely affected by the backpressure/backpressure increase in the honeycomb body. Furthermore, functional limitations may occur, in the worst case damage to components downstream in the flow direction, since parts of the exfoliated catalytically active coating, in particular the precious metals contained therein, may trigger undesired chemical interactions with downstream components.
Disclosure of Invention
It is therefore an object of the present invention to provide a honeycomb body with increased flexibility in the axial direction, whereby plastic deformation of the metal foil in high heat load applications is reduced.
The object in terms of honeycomb is achieved by a honeycomb having the features of claim 1.
One embodiment of the invention relates to a honeycomb body for exhaust aftertreatment of an internal combustion engine, wherein the honeycomb body is formed from a plurality of metal foils which are stacked on top of one another in a stacked structure and wound around at least one rotation point, wherein the stacked structure is formed from smooth metal foils and at least partially structured metal foils alternately, the metal foils having a foil width and a foil length, the foil width extending from a gas inlet side towards a gas outlet side in a main flow direction of the honeycomb body, the foil length extending transversely to the main flow direction, wherein at least some/each/individual metal foil has at least a number of slots dividing the respective metal foil into a number of sections.
The foil is formed from a thin metal sheet having a length and width that are substantially greater than the thickness of the associated metal sheet. In the honeycomb body according to the present invention, the width of the metal foil means the extension length in the axial direction of the rolled honeycomb body. The length of the metal foil extends in a direction orthogonal to the width and in the circumferential direction of the honeycomb body in the rolled honeycomb body. The metal foil has notches that penetrate the metal foil at least partially, thereby creating segments of the metal foil and thus segments of the honeycomb body. By means of this notch, the individual sections are mechanically decoupled from one another, as a result of which the flexibility of the honeycomb body is increased, wherein at the same time the structural integrity of the honeycomb body is ensured, since a complete severing of the honeycomb body is not achieved.
It is particularly advantageous if the notch extends in the direction of the length of the foil. The slot extends along the length of the foil, whereby the segmentation is performed such that a plurality of segments arranged in the axial direction are created. When the metal foil is rolled up, the slots in the honeycomb body extend in the circumferential direction of the honeycomb body. It is advantageous to form the axial sections in order to increase, in particular, the flexibility of the honeycomb body in order to compensate thermally induced stresses in the honeycomb body, in particular to prevent cracking and breaking of the washcoat, i.e. the catalytically active coating, applied to the metal foil.
It is also advantageous if the notches are arranged parallel to each other along the foil width and spaced apart from each other along the foil length.
A plurality of notches extending along the length of the foil form a row of slots. The notches within the groove rows are spaced apart from each other so that no complete severing of the metal foil occurs.
The plurality of groove rows are arranged spaced apart from one another along the foil width and parallel to one another, whereby individual axial sections are formed in the rolled honeycomb body.
A preferred embodiment is characterized in that a plurality of notches are arranged spaced apart from each other by spacers in a groove row extending along the length of the foil. The webs help to achieve that the notch does not sever the entire metal foil over its length so that the metal foil becomes unstable or destroyed. The strength of the corresponding metal foil can be influenced by the spacer width.
It is also preferred that a plurality of groove rows are arranged spaced apart from one another along the main flow direction, wherein preferably 1 to 20 groove rows, particularly preferably 1 to 12 groove rows, are provided.
Honeycomb bodies for the exhaust gas aftertreatment field of passenger cars have an axial length of usually 30mm to 180mm, so that in extensive research it has proven particularly advantageous for the number of 1 to 20 groove rows or preferably 1 to 12 groove rows to be sufficiently flexible on the one hand to prevent cracking of the catalytically active coating and on the other hand to have sufficient stability in the laminate structure so that the mechanical process of rolling up around one or more winding axes does not lead to damage to the metal foil.
It is furthermore advantageous if the webs arranged between the notches of a groove row have a length of 0.5mm to 20mm, particularly preferably a length of 1mm to 10 mm. This specification has also proved to be particularly advantageous in terms of the size of the honeycomb body that is normally used, in order to achieve a balance between flexibility and stability.
It is furthermore advantageous if the length of the webs at the central region and/or at the edge region of the respective metal foil is greater than the length of the webs between the central region and the edge region of the metal foil.
It is also advantageous if the width of the slot in the direction of the foil width is less than 2mm, particularly preferably less than 1mm. Since the purpose of the notch is mainly to interrupt the shearing forces occurring under thermal load, and furthermore the notch should not have the effect of conducting exhaust gases, it is advantageous to keep the notch as narrow as possible.
The notch may advantageously be produced, for example, by means of a partially interrupted roll cutter. Alternatively, the rolling blade may also function by controlled sinking into the foil plane. The notch may also be created by laser welding.
It is furthermore advantageous if the groove rows are unevenly distributed along the foil width. The uneven distribution of the groove rows can be particularly simple to react to specific installation situations. Thus, different temperature profiles can be achieved on different honeycombs, so that shear breaks in certain regions of the honeycombs must be greater than in other regions. By a targeted arrangement of the slot rows, a solution specifically adapted to the use case can be achieved.
It is furthermore advantageous if the spacing of the groove rows in the region of the gas inlet side differs from the spacing of the groove rows on the gas outlet side.
This is particularly advantageous because the temperatures occurring at the gas inlet side and the gas outlet side can differ from each other. Although the temperature becomes even with the operating time, initially a higher temperature occurs on the gas inlet side than on the gas outlet side, thus resulting in an additional temperature gradient.
Another advantage of the slots is that the axial heat conduction through the honeycomb body is reduced, thereby achieving better heating performance of the honeycomb body.
The grooving process is preferably integrated directly into the manufacturing process of conventional honeycomb bodies and can be performed on individual metal foils that have been cut to size or on continuous metal foils. Particularly preferably, both the smooth metal foil and the at least partially structured metal foil are provided with notches. For at least partially structured metal foils, a grooving process is performed prior to the structuring process. In particular in at least partially structured metal foils, the notch and the web length are adapted to the shortening factors that are effective for the respective structure, for example the corrugation.
Advantageous developments of the invention are described in the dependent claims and the following description of the figures.
Drawings
The present invention will be described in detail below with reference to the accompanying drawings according to embodiments. The figure shows:
fig. 1 shows a top view of a metal foil, wherein rows of slots spaced apart along the foil width and slots arranged in the rows of slots along the foil length are shown,
Fig. 2 shows a cross-section of a honeycomb body in a carrier tube, in which a plurality of groove rows are arranged which are uniformly spaced apart along the main flow direction,
Fig. 3 shows a cross-section of a honeycomb body in a carrier tube, in which a plurality of groove rows are arranged unevenly spaced along the main flow direction, and
Fig. 4 shows a cross-section of a honeycomb body in a carrier tube, in which a plurality of groove rows are arranged unevenly spaced along the main flow direction, wherein the spacing of the groove rows differs on the gas inlet side and on the gas outlet side.
Detailed Description
Fig. 1 shows a top view of a metal foil 1. The metal foil 1 shown is a smooth metal foil without structuring. What is described below for this smooth metal foil 1 can equally well be applied to at least partially structured metal foils.
The metal foil 1 has a plurality of notches 2, which notches 2 extend along the foil length 3. The individual groove rows 4 are arranged parallel to each other and spaced apart in the direction of the foil width 5. The metal foil 1 is divided into sections 8 by the slot rows 4. The sections 8 are arranged adjacent to one another in the axial direction of the produced honeycomb body.
Spacers 6, 7 are arranged between the individual notches 2 of a groove row 4. In the embodiment of fig. 1, the webs 6 in the central region and the webs 6 at the outer edge regions of the metal foil 1 are configured to be wider than the webs 7 in the middle region.
The metal foil 1 forms a single layer in a laminated structure which is then wound into a honeycomb body.
Fig. 2 shows a cross-section of a honeycomb body 9 arranged in a sleeve 10. The honeycomb body 9 can be flowed through from the gas inlet side 11 toward the gas outlet side 12 along flow channels 16 formed by the metal foil. A slot is designated by reference numeral 13, which divides the honeycomb body 9 into a plurality of sections 14. In the embodiment of fig. 2, the groove rows 15 are arranged equidistantly over the axial extent of the honeycomb body 9.
Fig. 3 shows the honeycomb body 9 in a sleeve 10. The honeycomb body 9 corresponds to the structure of the honeycomb body 9 shown in fig. 2. For the same elements, the reference numerals are identical.
Unlike fig. 2, the groove rows 15 are unevenly distributed, so that in the region of the gas inlet side 11 a narrow section 17 is formed, which is coupled with a plurality of equally wide sections 18.
Fig. 4 shows an alternative design of the honeycomb body 9. The groove rows 19 are arranged such that the section(s) 20 gradually widen from the gas inlet side 11 to the gas outlet side 12.
The different features of the various embodiments may also be combined with each other. The arrangement of the slot rows may also differ from the embodiments shown herein. Thus, the section can also widen or narrow, for example, from the gas outlet side to the gas inlet side.
The embodiments of fig. 1 to 4 are not limiting in particular, but serve to illustrate the inventive concept.
List of reference numerals:
1. metal foil
2. Notch groove
3. Foil length
4. Groove row
5. Foil width
6. Spacer sheet
7. Spacer sheet
8. Segment(s)
9. Honeycomb body
10. Bearing tube
11. Gas inlet side
12. Gas outlet side
13. Notch groove
14. Segment(s)
15. Groove row
16. Flow channel
17. Segment(s)
18. Segment(s)
19. Groove row
20. Segment(s)

Claims (10)

1. Honeycomb body (9) for exhaust gas aftertreatment of an internal combustion engine, wherein the honeycomb body (9) is formed from a plurality of metal foils (1) which are stacked on top of one another in a stacked structure and wound around at least one rotation point, wherein the stacked structure is formed alternately from smooth metal foils (1) and at least partially structured metal foils (1), wherein the metal foils (1) have a foil width (5) and a foil length (3), wherein the foil width (5) extends from a gas inlet side (11) towards a gas outlet side (12) in a main flow direction of the honeycomb body (9), the foil length (3) extends transversely to the main flow direction,
It is characterized in that the method comprises the steps of,
At least some of the metal foils (1) have at least a number of notches (2, 13) dividing the respective metal foil (1) into a plurality of sections (8, 14, 17, 18, 20).
2. Honeycomb body (9) according to claim 1, characterized in that the slots (2, 13) extend in the direction of the foil length (3).
3. Honeycomb body (9) according to any of the preceding claims, characterized in that the slots (2, 13) are arranged parallel to each other along the foil width (5) and spaced apart from each other along the foil length (3).
4. Honeycomb body (9) according to any of the preceding claims, characterized in that a plurality of slots (2, 13) are arranged spaced apart from each other by spacers (6, 7) in a slot row extending along the foil length (3).
5. Honeycomb body (9) according to any one of the preceding claims, characterized in that a plurality of slot rows (4, 15, 19) are arranged spaced apart from one another along the main flow direction, wherein preferably 1 to 20 slot rows (4, 15, 19), particularly preferably 1 to 12 slot rows (4, 15, 19) are provided.
6. Honeycomb body (9) according to any of the preceding claims, characterized in that the spacers (6, 7) arranged between the slots (2, 13) of a slot row (4, 15, 19) have a length of 0.5mm to 20mm, particularly preferably a length of 1mm to 10 mm.
7. Honeycomb body (9) according to any one of the preceding claims, characterized in that the length of the spacers (6) at the central region and/or at the edge regions of the respective metal foil (1) is greater than the length of the spacers (7) between the central region and the edge regions of the metal foil (1).
8. Honeycomb body (9) according to any of the preceding claims, characterized in that the slot width in the direction of the foil width (5) is less than 2mm, particularly preferably less than 1mm.
9. Honeycomb body (9) according to any of the preceding claims, characterized in that the rows of grooves (15, 19) are unevenly distributed along the foil width (5).
10. Honeycomb body (9) according to any of the preceding claims, characterized in that the spacing of the groove rows in the region of the gas inlet side (11) differs from the spacing of the groove rows in the gas outlet side (12).
CN202280068544.4A 2021-10-11 2022-09-27 Honeycomb body with slotted metal foil for exhaust gas aftertreatment Pending CN118103589A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102021211453.9 2021-10-11
DE102021211453.9A DE102021211453A1 (en) 2021-10-11 2021-10-11 Honeycomb body for the purpose of exhaust aftertreatment with slotted metal foils
PCT/EP2022/076784 WO2023061746A1 (en) 2021-10-11 2022-09-27 Honeycomb body for exhaust-gas aftertreatment, having slotted metal foils

Publications (1)

Publication Number Publication Date
CN118103589A true CN118103589A (en) 2024-05-28

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ID=84053276

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202280068544.4A Pending CN118103589A (en) 2021-10-11 2022-09-27 Honeycomb body with slotted metal foil for exhaust gas aftertreatment

Country Status (4)

Country Link
KR (1) KR20240051279A (en)
CN (1) CN118103589A (en)
DE (1) DE102021211453A1 (en)
WO (1) WO2023061746A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022212290A1 (en) 2022-11-18 2024-05-23 Emitec Technologies GmbH Exhaust aftertreatment device with a slotted matrix

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR0140505B1 (en) * 1991-01-31 1998-06-01 볼프강 마우스, 지그프리트 나스 Honeycomb body with non-uniform electric heating
DE4303601A1 (en) * 1993-02-08 1994-08-11 Emitec Emissionstechnologie Electrically heated honeycomb body with increased resistance through slots
JPH08103664A (en) 1994-10-04 1996-04-23 Nippondenso Co Ltd Honeycomb body and catalytic converter having catalyst carrier consisting of the honeycomb body
JP3755008B2 (en) * 1995-05-22 2006-03-15 株式会社日本自動車部品総合研究所 Method for producing metal catalyst carrier for exhaust gas purification

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DE102021211453A1 (en) 2023-04-13
WO2023061746A1 (en) 2023-04-20
KR20240051279A (en) 2024-04-19

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