US20150113965A1 - Exhaust system for a diesel engine - Google Patents

Exhaust system for a diesel engine Download PDF

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Publication number
US20150113965A1
US20150113965A1 US14/115,207 US201214115207A US2015113965A1 US 20150113965 A1 US20150113965 A1 US 20150113965A1 US 201214115207 A US201214115207 A US 201214115207A US 2015113965 A1 US2015113965 A1 US 2015113965A1
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United States
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.)
Abandoned
Application number
US14/115,207
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
Assigned to DAF TRUCKS N.V. reassignment DAF TRUCKS N.V. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WIELAND, ALBERTUS MARTINUS HERMAN
Publication of US20150113965A1 publication Critical patent/US20150113965A1/en
Abandoned 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
    • F01N3/02—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.
  • 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
  • AMOX catalyst ammonia oxidation 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.
  • FIG. 1 shows an embodiment of the exhaust gas system according to the invention in longitudinal section
  • FIG. 2 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 11 A and 11 B 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 19 B open at the outlet end 21 and closed at the inlet end 19 .
  • the exhaust gas 19 is forced to flow through the walls 13 .
  • FIG. 2 gives a detailed representation of the interior of the filter 9 in enlarged form.
  • 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 .
  • 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)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (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

    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:
  • FIG. 1 shows an embodiment of the exhaust gas system according to the invention in longitudinal section; and
  • FIG. 2 gives a detailed representation of the interior of the exhaust gas system shown in FIG. 1.
    •  DETAILED DESCRIPTION OF THE DRAWING FIGURES
  • 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 11A open at the inlet end 19 and closed at the outlet end 21 are then surrounded by channels 19B open at the outlet end 21 and closed at the inlet end 19. As a result, the exhaust gas 19 is forced to flow through the walls 13.
  • FIG. 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 (2)

1. 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, 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.
2. An exhaust gas system as claimed in claim 1, characterized in that the filter is a diesel particle filter, in that the first coating is a selective catalytic reduction coating and in that the second coating is an ammonia oxidation catalyst coating.
US14/115,207 2011-05-02 2012-05-01 Exhaust system for a diesel engine Abandoned US20150113965A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
NL2006705 2011-05-02
NL2006705 2011-05-02
NL2006993 2011-06-24
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
US20150113965A1 true US20150113965A1 (en) 2015-04-30

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ID=46246154

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/115,207 Abandoned US20150113965A1 (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)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170241312A1 (en) * 2014-10-17 2017-08-24 Jaguar Land Rover Limited Particulate filter
US20190086304A1 (en) * 2012-09-24 2019-03-21 Smiths Detection-Watford Limited On-demand vapour generator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8246922B2 (en) * 2009-10-02 2012-08-21 Basf Corporation Four-way diesel catalysts and methods of use
US8591820B2 (en) * 2011-03-11 2013-11-26 Corning Incorporated Honeycomb filters for reducing NOx and particulate matter in diesel engine exhaust
US8756926B2 (en) * 2008-07-09 2014-06-24 Johnson Matthey Public Limited Company Exhaust system for a lean burn ic engine
US8789356B2 (en) * 2011-07-28 2014-07-29 Johnson Matthey Public Limited Company Zoned catalytic filters for treatment of exhaust gas
US8802016B2 (en) * 2009-11-20 2014-08-12 BASF Catalyst Germany GmbH Zoned catalyzed soot filter
US8844274B2 (en) * 2009-01-09 2014-09-30 Ford Global Technologies, Llc Compact diesel engine exhaust treatment system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9919013D0 (en) * 1999-08-13 1999-10-13 Johnson Matthey Plc Reactor
EP2489844A1 (en) * 2009-10-13 2012-08-22 UD Trucks Corporation Exhaust purification device for engine
US8722000B2 (en) * 2011-03-29 2014-05-13 Basf Corporation Multi-component filters for emissions control

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8756926B2 (en) * 2008-07-09 2014-06-24 Johnson Matthey Public Limited Company 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
US8802016B2 (en) * 2009-11-20 2014-08-12 BASF Catalyst Germany GmbH 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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20190086304A1 (en) * 2012-09-24 2019-03-21 Smiths Detection-Watford Limited On-demand vapour generator
US10775283B2 (en) * 2012-09-24 2020-09-15 Smiths Detection-Watford Limited On-demand vapor generator
US20170241312A1 (en) * 2014-10-17 2017-08-24 Jaguar Land Rover Limited Particulate filter
US10233804B2 (en) * 2014-10-17 2019-03-19 Jaguar Land Rover Limited Particulate filter

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Publication number Publication date
NL2006993C2 (en) 2012-11-05
WO2012158022A1 (en) 2012-11-22
EP2705226A1 (en) 2014-03-12

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Legal Events

Date Code Title Description
AS Assignment

Owner name: DAF TRUCKS N.V., NETHERLANDS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WIELAND, ALBERTUS MARTINUS HERMAN;REEL/FRAME:032439/0937

Effective date: 20140106

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION