EP2705226A1 - Exhaust system for a diesel engine - Google Patents

Exhaust system for a diesel engine

Info

Publication number
EP2705226A1
EP2705226A1 EP12726912.4A EP12726912A EP2705226A1 EP 2705226 A1 EP2705226 A1 EP 2705226A1 EP 12726912 A EP12726912 A EP 12726912A EP 2705226 A1 EP2705226 A1 EP 2705226A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
coated
walls
coating
catalyst coating
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.)
Withdrawn
Application number
EP12726912.4A
Other languages
German (de)
French (fr)
Inventor
Albertus Martinus Herman Wieland
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.)
DAF Trucks NV
Original Assignee
DAF Trucks NV
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 DAF Trucks NV filed Critical DAF Trucks NV
Publication of EP2705226A1 publication Critical patent/EP2705226A1/en
Withdrawn legal-status Critical Current

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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • 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
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
    • 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
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/02—Combinations of different methods of purification filtering and catalytic conversion
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • F01N2510/068—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings
    • F01N2510/0682—Surface coverings for exhaust purification, e.g. catalytic reaction characterised by the distribution of the catalytic coatings having a discontinuous, uneven or partially overlapping coating of catalytic material, e.g. higher amount of material upstream than downstream or vice versa
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/18—Ammonia
    • 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

Definitions

  • the invention relates to an exhaust gas system for a diesel engine comprising an inlet and an outlet and a filter located in between comprising a plurality of channels arranged next to one another and having porous walls, where neighbouring channels are alternately shut off by an end plug at the inlet end and the outlet end, as a result of which the exhaust gas is forced to flow through the walls which are at least partially coated with a first coating.
  • a filter located in between comprising a plurality of channels arranged next to one another and having porous walls, where neighbouring channels are alternately shut off by an end plug at the inlet end and the outlet end, as a result of which the exhaust gas is forced to flow through the walls which are at least partially coated with a first coating.
  • An exhaust system of this type is generally known in the form of a diesel particle filter (DPF) in which the walls of the channels are coated with a selective catalytic reduction catalyst (SCR catalyst). The end plugs are generally installed before the walls are coated.
  • DPF diesel particle filter
  • SCR catalyst selective catalytic reduction catalyst
  • the exhaust gas system according to the invention is characterized in that from the outlet end to a distance from this outlet end, the walls are coated with a second coating, where the end plugs in the outlet ends have a length that is at least equal to said distance over which the walls are coated with the second coating. If the AMOX catalyst has not been coated in the place of the end plugs on the walls of the channels, the exhaust gas will partially flow through the AMOX catalyst coated wall sections and partially through the SCR catalyst coated wall sections.
  • Figure 1 shows an embodiment of the exhaust gas system according to the invention in longitudinal section
  • FIG. 1 gives a detailed representation of the interior of the exhaust gas system shown in Fig. 1.
  • FIG. 1 shows an embodiment of the exhaust gas system for a diesel engine according to the invention.
  • the exhaust gas system 1 comprises a housing 3 which has an inlet 5 and an outlet 7 and a filter 9 accommodated in the housing.
  • the filter comprises channels 11A and 11B extending in the direction of flow and having porous walls 13.
  • the channels are open at one end and closed at the other by means of an end plug 15, 17.
  • the channels 11 A open at the inlet end 19 and closed at the outlet end 21 are then surrounded by channels 19B open at the outlet end 21and closed at the inlet end 19.
  • the exhaust gas 19 is forced to flow through the walls 13.
  • Figure 2 gives a detailed representation of the interior of the filter 9 in enlarged form. From the inlet end 19 onwards the walls 13 are coated with an SCR coating 25 over a first distance and coated with an AMOX catalyst coating 29 from the outlet end 21 onwards over a second distance 27. The end plugs 17 in the outlet ends have a length that at least equals said second distance 27 over which the walls are coated with the AMOX catalyst coating 29. As a result, one side of the wall sections coated with the AMOX catalyst coating is covered and the exhaust gas cannot but flow first through the wall sections 13 coated with SCR catalyst coating 25. Only then can the exhaust gas flow past the wall sections 13 coated with the AMOX catalyst coating 29.

Landscapes

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

Abstract

An exhaust gas system for a diesel engine comprises a filter 9 that includes channels extending in the direction of flow and having porous walls 13 which are clad with an SCR catalyst coating 25. Neighbouring channels are alternately shut off by end plugs 15, 17 at the inlet end and the outlet end, as a result of which the exhaust gas is forced to flow through the walls. The walls 13 are coated with an AMOX catalyst coating 29 from the end 21 over a distance 27. The end plugs 17 in the outlet ends have a length that at least equals said distance 27. As a result, one side of the wall sections coated with the AMOX catalyst coating is covered and the exhaust gas cannot but flow first through the wall sections coated with SCR catalyst coating 25 and only then can the exhaust gas flow past the wall sections coated with the AMOX catalyst coating 29.

Description

Exhaust gas system for a diesel engine
DESCRIPTION:
Field of the invention
The invention relates to an exhaust gas system for a diesel engine comprising an inlet and an outlet and a filter located in between comprising a plurality of channels arranged next to one another and having porous walls, where neighbouring channels are alternately shut off by an end plug at the inlet end and the outlet end, as a result of which the exhaust gas is forced to flow through the walls which are at least partially coated with a first coating. State of the art
An exhaust system of this type is generally known in the form of a diesel particle filter (DPF) in which the walls of the channels are coated with a selective catalytic reduction catalyst (SCR catalyst). The end plugs are generally installed before the walls are coated.
Once the exhaust gas has flown through the DFP with the SCR catalyst on it, it is desirable to have the filtered exhaust gas flow past an ammonia oxidation catalyst (AMOX catalyst). Summary of the invention
It is an object of the invention to provide an exhaust gas system of the type defined in the opening paragraph which is advantageously provided with an AMOX catalyst. For this purpose the exhaust gas system according to the invention is characterized in that from the outlet end to a distance from this outlet end, the walls are coated with a second coating, where the end plugs in the outlet ends have a length that is at least equal to said distance over which the walls are coated with the second coating. If the AMOX catalyst has not been coated in the place of the end plugs on the walls of the channels, the exhaust gas will partially flow through the AMOX catalyst coated wall sections and partially through the SCR catalyst coated wall sections. By covering one side of the sections of the walls which are coated with the AMOX catalyst, the exhaust gas cannot but flow first through the SCR catalyst coated sections of the walls. Not until then can the exhaust gas flow past the wall sections coated with the AMOX catalyst coating. By shutting off the wall sections coated with the AMOX catalyst coating by means of the end plugs, no extra closing means are required. Only the end plugs in the outlet end need to be made longer than normal.
Brief description of the drawing figures. The invention will be further described below in more detail with reference to an embodiment of the exhaust gas system according to the invention represented in the drawing figures, in which:
Figure 1 shows an embodiment of the exhaust gas system according to the invention in longitudinal section; and
Figure 2 gives a detailed representation of the interior of the exhaust gas system shown in Fig. 1.
Detailed description of the drawing figures Figure 1 shows an embodiment of the exhaust gas system for a diesel engine according to the invention. The exhaust gas system 1 comprises a housing 3 which has an inlet 5 and an outlet 7 and a filter 9 accommodated in the housing. The filter comprises channels 11A and 11B extending in the direction of flow and having porous walls 13. The channels are open at one end and closed at the other by means of an end plug 15, 17. The channels 11 A open at the inlet end 19 and closed at the outlet end 21 are then surrounded by channels 19B open at the outlet end 21and closed at the inlet end 19. As a result, the exhaust gas 19 is forced to flow through the walls 13.
Figure 2 gives a detailed representation of the interior of the filter 9 in enlarged form. From the inlet end 19 onwards the walls 13 are coated with an SCR coating 25 over a first distance and coated with an AMOX catalyst coating 29 from the outlet end 21 onwards over a second distance 27. The end plugs 17 in the outlet ends have a length that at least equals said second distance 27 over which the walls are coated with the AMOX catalyst coating 29. As a result, one side of the wall sections coated with the AMOX catalyst coating is covered and the exhaust gas cannot but flow first through the wall sections 13 coated with SCR catalyst coating 25. Only then can the exhaust gas flow past the wall sections 13 coated with the AMOX catalyst coating 29.
Albeit the invention has been elucidated in the foregoing with reference to the drawing figures, it should be set out that the invention is not by any manner or means restricted to the embodiments shown in the drawing figures. The invention also extends to any embodiments deviating from the embodiments shown in the drawing figures within the spirit and scope defined by the claims.

Claims

CLAIMS:
1. An exhaust gas system (1) for a diesel engine comprising an inlet (5) and an outlet (7) and a filter (9) located in between comprising a plurality of channels (11A, 11B) arranged next to one another and having porous walls (13), where neighbouring channels are alternately shut off by an end plug (15, 17) at the inlet end (19) and the outlet end (21), as a result of which the exhaust gas is forced to flow through the walls (13) which are at least partially coated with a first coating (25), characterized in that from the outlet end (21) to a distance (27) from this outlet end, the walls (13) are coated with a second coating (29), where the end plugs (17) in the outlet ends have a length that is at least equal to said distance (27) over which the walls (13) are coated with the second coating (29).
2. An exhaust gas system (1) as claimed in claim 1, characterized in that the filter (9) is a diesel particle filter, in that the first coating (25) is a selective catalytic reduction coating and in that the second coating (29) is an ammonia oxidation catalyst coating.
EP12726912.4A 2011-05-02 2012-05-01 Exhaust system for a diesel engine Withdrawn EP2705226A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NL2006705 2011-05-02
NL2006993A NL2006993C2 (en) 2011-05-02 2011-06-24 EXHAUST GAS SYSTEM FOR A DIESEL ENGINE.
PCT/NL2012/050304 WO2012158022A1 (en) 2011-05-02 2012-05-01 Exhaust system for a diesel engine

Publications (1)

Publication Number Publication Date
EP2705226A1 true EP2705226A1 (en) 2014-03-12

Family

ID=46246154

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12726912.4A Withdrawn EP2705226A1 (en) 2011-05-02 2012-05-01 Exhaust system for a diesel engine

Country Status (4)

Country Link
US (1) US20150113965A1 (en)
EP (1) EP2705226A1 (en)
NL (1) NL2006993C2 (en)
WO (1) WO2012158022A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014045067A1 (en) * 2012-09-24 2014-03-27 Smiths Detection-Watford Limited On-demand vapour generator
CN103670611B (en) * 2013-12-16 2016-04-27 上海三一重机有限公司 A kind of exhaust gas processing device and comprise the diesel engine of this exhaust gas processing device
GB2531338B (en) * 2014-10-17 2018-09-12 Jaguar Land Rover Ltd Particulate filter

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012135871A1 (en) * 2011-03-29 2012-10-04 Basf Corporation Multi-component filters for emissions control

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
GB9919013D0 (en) * 1999-08-13 1999-10-13 Johnson Matthey Plc Reactor
GB0812544D0 (en) * 2008-07-09 2008-08-13 Johnson Matthey Plc Exhaust system for a lean burn IC engine
US8844274B2 (en) * 2009-01-09 2014-09-30 Ford Global Technologies, Llc Compact diesel engine exhaust treatment system
US8246922B2 (en) * 2009-10-02 2012-08-21 Basf Corporation Four-way diesel catalysts and methods of use
WO2011045847A1 (en) * 2009-10-13 2011-04-21 日産ディーゼル工業株式会社 Exhaust purification device for engine
EP2501464B1 (en) * 2009-11-20 2018-02-28 Basf Se Zoned catalyzed soot filter
US8591820B2 (en) * 2011-03-11 2013-11-26 Corning Incorporated Honeycomb filters for reducing NOx and particulate matter in diesel engine exhaust
US8789356B2 (en) * 2011-07-28 2014-07-29 Johnson Matthey Public Limited Company Zoned catalytic filters for treatment of exhaust gas

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012135871A1 (en) * 2011-03-29 2012-10-04 Basf Corporation Multi-component filters for emissions control

Also Published As

Publication number Publication date
US20150113965A1 (en) 2015-04-30
NL2006993C2 (en) 2012-11-05
WO2012158022A1 (en) 2012-11-22

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