EP1633960A1 - Flow reversal in exhaust system including filter - Google Patents

Flow reversal in exhaust system including filter

Info

Publication number
EP1633960A1
EP1633960A1 EP04742998A EP04742998A EP1633960A1 EP 1633960 A1 EP1633960 A1 EP 1633960A1 EP 04742998 A EP04742998 A EP 04742998A EP 04742998 A EP04742998 A EP 04742998A EP 1633960 A1 EP1633960 A1 EP 1633960A1
Authority
EP
European Patent Office
Prior art keywords
filter
gas
gas flow
collecting
exhaust gas
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Withdrawn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
EP04742998A
Other languages
German (de)
English (en)
French (fr)
Inventor
Eive Tord Ronny Allansson
Anders Klas Andreasson
Mats Lavenius
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.)
Johnson Matthey PLC
Original Assignee
Johnson Matthey PLC
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 Johnson Matthey PLC filed Critical Johnson Matthey PLC
Publication of EP1633960A1 publication Critical patent/EP1633960A1/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Withdrawn legal-status Critical Current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
    • F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
    • 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
    • F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/0233—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 using means for regenerating the filters, e.g. by burning trapped particles periodically cleaning filter by blowing a gas through the filter in a direction opposite to exhaust flow, e.g. exposing filter to engine air intake
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0093—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are of the same 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
    • F01N3/02—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
    • 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
    • F01N3/0211—Arrangements for mounting filtering elements in housing, e.g. with means for compensating thermal expansion or vibration
    • 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
    • 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
    • F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/0231—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 using means for regenerating the filters, e.g. by burning trapped particles using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
    • 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
    • F01N3/08—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
    • F01N3/2093—Periodically blowing a gas through the converter, e.g. in a direction opposite to exhaust gas flow or by reversing exhaust gas flow direction
    • 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

Definitions

  • This invention relates to engine exhaust gas treatment when the exhaust gas contains particulate matter (PM), and in particular such treatment including intermittent flow reversal in a particulate filter.
  • PM particulate matter
  • the invention provides a process for treating an exhaust gas of a lean-burn reciprocating internal combustion engine comprising, in downstreamward order, the steps of: (i) collecting PM on a first, porous filter and combusting a carbon fraction thereof: and (ii) periodically reversing the direction of gas flow through the first filter, thereby displacing uncombusted PM from the Vietnamesewhile upstream side thereof, characterised by collecting at least part of the displaced PM on a second filter.
  • the invention provides an exhaust gas treatment system for a lean-burn reciprocating internal combustion engine comprising, in downstreamward order:
  • a first, porous filter effective to collect PM for combustion of carbon fraction thereof; and (ii) means for periodically reversing the direction of gas flow through the first filter, whereby to displace uncombusted PM, characterised in that a second filter for collecting at least part of said displaced PM is disposed downstream of said first filter.
  • the second filter may have pores smaller than in the first filter, whereby to collect particles too small to be collected by the first filter.
  • the first filter can have larger pores than those of established systems using a single filtering stage.
  • the second filter can be an inexpensive, readily replaceable unit using organic material such as woven or non- woven textile e.g. paper; this is preferably mounted in a snap-on or screw-on housing, suitably made by injection-moulding.
  • Suitable filter material includes papers resistant to heat and moisture. They typically comprise cellulose with hydrophobic fibres.
  • a further characteristic of modern engines is that engine out NO x can be too low for passive filter regeneration using NO 2 generated catalytically by oxidation of NO as described in US 4,902,487. This problem can be exacerbated by the above- mentioned lower exhaust temperatures, so that, in practice, active techniques for filter regeneration may be required to maintain the back pressure across the filter within acceptable design tolerances. Such active regeneration techniques are described in EP 0758713, for example.
  • An advantage of the present invention to the practical application of the CRT ® process is that flow reversal in the first filter can be used to clear PM that is not readily combusted in NO 2 over a drive cycle. The uncombusted PM can be collected on the second filter for removal at suitable intervals.
  • the arrangement has particular use to the retrofit market, providing a practical and economic alternative to fitting expensive and fuel-costly active regeneration apparatus.
  • the gas is subjected to catalytic nitrogen monoxide (NO) oxidation upstream of the first filter.
  • the first filter may be catalysed.
  • Suitable filter catalysts include base metals for promoting PM combustion, such as La/Cs/N 2 O 5 , or one or more platinum group metals (PGM), particularly platinum.
  • the PGM can be supported on the filter material per se, or on washcoat components formulated to prevent clogging of the filter pores.
  • washcoat components can include alumina, ceria and ceria zirconia mixed or composite oxides, for example.
  • the filter catalyst can include a ⁇ O x absorber in addition to PGM-based components, in which case the filter can be referred to as a 4-way catalyst.
  • the material of the second filter may be treated externally to recover catalyst dust if the first filter is catalysed.
  • filter flow reversal is by means of a pipe junction: receiving exhaust gas inlet from an engine possibly via preceding treatment(s); feeding said gas to one end of the filter; intermittently switching said gas feed to the other end of the filter; and receiving filter outlet gas, delivering it to said second filter and thence to atmosphere, possibly via further treatment.
  • the flow switching step is operable via a condition in which all connections are open and excluding a condition in which all are closed.
  • connections to the valve may be duplicated thus: for feeding gas to the filter, a lagged pipe; and for receiving gas from the filter, a finned pipe.
  • the pipe junction suitably includes a 4-way valve.
  • a 4-way valve typically comprises: an outer cylindrical or frusto-conical casing formed with angularly spaced apertures each leading to external flow connections; and deflector means effective to: select alternatingly one from two incoming streams; or to direct a single incoming stream alternatingly to either of two outlets; or to direct two incoming streams into a single stream.
  • the deflector means is preferably operable over an arcuate path between the two extreme positions at which selected gas flow is required.
  • the deflector means may comprise a 'butterfly'.
  • the valve casing may be formed with a wall-region of greater diameter corresponding to the intended traverse of the butterfly, and the change to the lesser diameter at the extremities of the traverse is formed as a step conformed to the profile of the butterfly and effective as a seal against gas leakage.
  • the traverse of the butterfly is typically 10- 20% of the circumference of the casing. If intermediate non-selective gas flow is required, this is provided by the actuator means.
  • the deflector means may be provided by a barrel fitting fluid-tightly within the casing and rotatable on an axis transverse to the main direction of fluid flow; formed along each of two or more radial planes of the barrel at least one fluid tight dividing member; and formed in each division at least one passage open at mutually angled positions about the circumference of the barrel, said positions corresponding to the apertures.
  • the barrel (if used) can be provided by uniting sheet material to define its outer shape and internal passages or by shaping solid material and forming the passages by boring thereinto, so that the residues between bores constitute the dividing members.
  • Each passage normally has an outlet angled to its inlet, for example perpendicularly in a 4-way valve with one inlet connection and two or three outlet connections.
  • each passage may have one inlet and two outlets.
  • the valve may include means limiting angular movement of the barrel to positions in which selected flow connections or all flow connections are open.
  • Other features of the process and system may include: upstream of the junction, at least one of: i) catalytically oxidising NO to nitrogen dioxide (NO 2 ) as already mentioned; and/or ii) actively increasing the gas temperature when required; downstream of the junction, at least one of: i. a nitrogen oxides (NO x ) removal step such as a lean-NO x catalyst, a regenerable NO x sorber or selective catalytic reduction (SCR); ii. a diesel oxidation catalyst (DOC); and optionally on the first filter and/or (if heat-stable) the second filter: a catalyst effective for combustion of the carbon fraction of PM with NO 2 and/or oxygen.
  • NO x nitrogen oxides
  • SCR selective catalytic reduction
  • DOC diesel oxidation catalyst
  • the catalyst of i), ii), i or ii is suitably on a flowthrough monolithic substrate composed of ceramic, wound corrugated metal, metal as foam or sinter or orderly or random wire or flat wire.
  • the first and possibly the second filter may use substrate material similar to those of sorbents and catalysts, but in 'filter grade' permeable to gas but with limited permeability to PM.
  • Figure 1 shows a system in which flow-reversal is effected by four separate valves
  • Figure 2 shows a system in which flow reversal is effected by a single 4-way valve
  • FIGs 3 A and 3B show enlarged plan views of a valve as used in Figure 2 representing the two extreme positions of the valve.
  • the system referred to generally as 10, comprises reactor 20 connected to a diesel engine exhaust manifold (not shown) and containing oxidation catalyst 22 consisting of a ceramic honeycomb carrying a washcoat and platinum (Pt).
  • oxidation catalyst 22 consisting of a ceramic honeycomb carrying a washcoat and platinum (Pt).
  • Pt platinum
  • pipes lead via valves 24A and 24B respectively to the header spaces of one end (shown LHS) and the other (shown RHS) of PM filter 26 consisting of a filter-grade ceramic honeycomb of the wall-flow type, the passages of which are alternatingly open and closed at the inlet end and, corresponding to the inlet open passages, alternatingly closed at the outlet end.
  • the system is operated under the control of a computer programmed to: open valves 24A and 24C and close valves 24B and 24D (as shown); receive a signal as to the pressure drop across filter 26; and close valves 24A and 24C and open valves 24B and 24D when the pressure drop reaches a pre-determined level.
  • opening and closing is timed to avoid blockage or bypassing.
  • each view is numbered as in Figure 2.
  • the plan views shown in these figures relate to an essentially cylindrical valve casing 50 formed internally with circumferential regions 52 of greater diameter, defimng the range of traverse of rectangular butterfly deflector 54 having pivoted operating shaft 56 extending out of the valve casing via a seal to an actuator (not shown).
  • the extremities of the range of traverse are defined by steps 58 between the regions differing in diameter, such steps limiting gas leakage out of its intended path.
  • the exhaust gas comprising steam (H 2 O( g )), nitrogen (N 2 ), oxygen (O 2 ), carbon dioxide (CO 2 ), unburned hydrocarbon fuel (HC), carbon monoxide (CO), NO x and PM, at e.g. 300°C contacts catalyst 22 over which NO is oxidised to NO 2 and some of the HC and CO are oxidised to steam and CO 2 . It then enters filter 26 on which most of the PM is collected and the carbon content thereof is combusted by reaction with the NO 2 formed in catalyst 22 and possibly with O 2 . The PM-depleted- gas then passes to vessel 31 holding filter 34, which collects PM released from filter 26. Such PM is typically ash, in which event filter 34 may be disposable, such as fibre or paper. Another duty of filter 34 can be to collect any ultra-fine combustible PM not collected by filter 26.

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)
  • Processes For Solid Components From Exhaust (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Exhaust Silencers (AREA)
  • Filtering Materials (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
EP04742998A 2003-06-18 2004-06-18 Flow reversal in exhaust system including filter Withdrawn EP1633960A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB0314243.7A GB0314243D0 (en) 2003-06-18 2003-06-18 Engine exhaust gas treatment
PCT/GB2004/002645 WO2004113692A1 (en) 2003-06-18 2004-06-18 Flow reversal in exhaust system including filter

Publications (1)

Publication Number Publication Date
EP1633960A1 true EP1633960A1 (en) 2006-03-15

Family

ID=27636875

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04742998A Withdrawn EP1633960A1 (en) 2003-06-18 2004-06-18 Flow reversal in exhaust system including filter

Country Status (7)

Country Link
US (1) US20060254263A1 (ko)
EP (1) EP1633960A1 (ko)
JP (1) JP2006527816A (ko)
KR (1) KR20060021382A (ko)
CN (1) CN1806098A (ko)
GB (1) GB0314243D0 (ko)
WO (1) WO2004113692A1 (ko)

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WO2008151090A1 (en) * 2007-05-30 2008-12-11 Gross David J Apparatus and method for increasing filter capacity using ultrasonic regeneration
JP5929458B2 (ja) * 2012-04-17 2016-06-08 いすゞ自動車株式会社 多気筒内燃機関とその制御方法
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CN110170199B (zh) * 2014-07-23 2022-10-25 康明斯滤清系统知识产权公司 入口旁路流动管理系统和方法
US9694321B2 (en) * 2015-09-01 2017-07-04 Caterpillar Inc. Exhaust treatment system with particulate filter having wall-flow and flow-through channels
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Also Published As

Publication number Publication date
JP2006527816A (ja) 2006-12-07
GB0314243D0 (en) 2003-07-23
US20060254263A1 (en) 2006-11-16
WO2004113692A1 (en) 2004-12-29
KR20060021382A (ko) 2006-03-07
CN1806098A (zh) 2006-07-19

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