EP0268026B2 - Verfahren zur Regenerierung von Partikelfiltern - Google Patents

Verfahren zur Regenerierung von Partikelfiltern Download PDF

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Publication number
EP0268026B2
EP0268026B2 EP87112215A EP87112215A EP0268026B2 EP 0268026 B2 EP0268026 B2 EP 0268026B2 EP 87112215 A EP87112215 A EP 87112215A EP 87112215 A EP87112215 A EP 87112215A EP 0268026 B2 EP0268026 B2 EP 0268026B2
Authority
EP
European Patent Office
Prior art keywords
air
burner
nozzle
exhaust
scavenging
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.)
Expired - Lifetime
Application number
EP87112215A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0268026B1 (de
EP0268026A1 (de
Inventor
Josef Ing. Schurrer
Josef Dipl.-Ing. Kreutmair
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.)
MT Aerospace AG
Original Assignee
MAN Technologie AG
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6312819&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0268026(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by MAN Technologie AG filed Critical MAN Technologie AG
Priority to AT87112215T priority Critical patent/ATE57248T1/de
Priority to JP62275560A priority patent/JP2608296B2/ja
Publication of EP0268026A1 publication Critical patent/EP0268026A1/de
Application granted granted Critical
Publication of EP0268026B1 publication Critical patent/EP0268026B1/de
Publication of EP0268026B2 publication Critical patent/EP0268026B2/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F01N3/023—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
    • F01N3/025—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 fuel burner or by adding fuel to exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details
    • F23D11/40—Mixing tubes; Burner heads
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1493—Purging the reducing agent out of the conduits or nozzle

Definitions

  • the invention relates to a method for regenerating particle filters for exhaust gases from internal combustion engines by means of a burner with an oil atomizing nozzle and two air supply devices which can be supplied with air independently of one another, wherein an air supply device is an air duct provided on the nozzle head of the oil atomizing nozzle and the second air supply device for the same Combustion air is used, purging air being fed into the burner chamber during the breaks in operation of the burner and during the operation of the internal combustion engine.
  • a device is known from US Pat. No. 4,581,891 in which the oil atomizing nozzle is arranged within a housing which can be flushed with the combustion air and which is branched off from the exhaust pipe.
  • An orifice separates the space on the nozzle side of the housing from the space in the housing which is connected to the exhaust pipe.
  • the orifice and the combustion air flowing around the nozzle prevent the exhaust gases from reaching the nozzle opening during operation of the burner.
  • deposits will form on the nozzle during the breaks in operation of the burner, since here the exhaust gas passes through the orifice unimpeded to the nozzle.
  • the invention has for its object to provide a method with which the contamination of the burner nozzle and the combustion chamber can be prevented.
  • the exhaust gases can be successfully kept away from the area of the nozzle opening during the entire operation of the internal combustion engine by the purge air flowing from the separate purge air source during the pauses in operation of the burner.
  • the nozzle opening can be continuously flushed, in particular during the breaks in operation of the burner, and the entire combustion chamber of the burner and its surroundings can also be kept free of deposits from the exhaust gases.
  • the burner areas can also be cooled and, in particular, dried. Aggressive media from condensate, which can form from exhaust gases, are thus removed.
  • the removal of condensate can advantageously be supported by means of suction channels.
  • the suction channels are arranged so that either a suction effect of the purge air is used or the channel opens into areas of different pressure, with one end of the suction channel being located at a point at which condensate collects.
  • the burner area which is kept dry and clean in this way, is particularly suitable as a measuring point for a sensor, e.g. B. for measuring the back pressure caused by the particle filter in the exhaust system.
  • the purge air duct is preferably provided with a throttle point which is arranged as close as possible to the oil atomizing nozzle in order to avoid a reversal of the flow which could be caused by brief pressure increases in the exhaust gas duct. It is important that the space of the purge air duct in the flow direction after the throttle point, that is, the space that surrounds the nozzle opening and faces the exhaust gas, is as small as possible.
  • the combustion air for the internal combustion engine can be used as the purge air source.
  • the purge air duct should preferably be supplied with compressed air of around 6 bar in order to increase the cleaning effect of the entire burner.
  • the compressed air brake system can expediently be used for this.
  • a dryer is provided between the compressor and the pressure vessel, so that this dry compressed air of 6-7 bar is particularly suitable, the burner and its surroundings in exhaust systems of condensate, the dissolved therein to keep aggressive media and particle deposits free. This largely eliminates the impairment of immovable, for example sensors, and moving components, such as valves, throttle valves, by corrosive substances. The service life and functionality of the exhaust system and the burner are thus significantly improved.
  • FIG. 1 An exemplary embodiment is shown schematically in the drawing, FIG. 1 showing the arrangement of a burner in the exhaust system and FIG. 2 the oil atomizing nozzle of the burner.
  • FIG. 1 shows an exhaust duct 10 of an internal combustion engine, not shown, in which a particle filter 11 is arranged.
  • the combustion chamber 46 of a burner 20 opens, which is equipped with an oil atomizing nozzle 34 and a mixing tube 24.
  • the burner system for regeneration of the filter 11 is designed so that the exhaust gases 13 can be used as combustion air for the burner 20 and as an oxygen-containing gas.
  • an expansion space 80 is provided which is surrounded by a housing 81, into which an inlet connection 70 for the exhaust gas 13 projects and which contains at least the hot part of the burner 20.
  • the exhaust gases 13 are led into the filter 11 via the main exhaust gas line 10, in that a main flap 82 releases the exhaust pipe 10, while a secondary flap 83 blocks the inlet connection 70 branching off from the exhaust pipe 10. Both flaps 82, 83 can be operated by the driver via a suitable mechanism 84.
  • the internal combustion engine of the vehicle is operated at idle, the main flap 82 is closed and the secondary flap 83 is opened.
  • the oxygen-containing exhaust gases 13 that arise during idling flow through the inlet connection 70 into the expansion space 80.
  • the fuel supply 29 to the burner 20 is released.
  • the fuel emerging from the nozzle 34 mixes with the partial flow of the exhaust gas 13 flowing in from the expansion tank.
  • the mixing tube 24 is arranged such that the combustion gases 23 are sucked back into the mixing tube 24 from the combustion chamber 46 via an annular cylindrical recirculation space 75.
  • the fuel 29 is heated and evaporated by the recirculating combustion gases 86 and mixed with these and the exhaust gas 13 to form a completely combustible gas which is ignited with an ignition device 85 and burns completely in the combustion zone 46 within the flame tube 47.
  • the burner 20 or the flame tube 47 is surrounded by a flow tube 71 which contains openings 72 through which the exhaust gases 13 partially reach the outlet of the flame tube 47 from the expansion space 80.
  • the exhaust gas entering here thus mixes with the hot gas 23 emerging from the flame tube 47.
  • the hot gas is brought to lower temperatures with the cooler exhaust gases 23 and, on the other hand, the oxygen in the hot gas 23 is enriched.
  • the hot gas 53 cooled in this way and mixed with oxygen then flows in the flow direction of the main exhaust gases 13 after the main flap 82 into the exhaust pipe 10 in order to get into the filter 11 from there.
  • the exhaust gas 13 can simultaneously be used to cool the flame tube 47 by providing corresponding openings 72 in the area of the flame tube 47 as well.
  • the exhaust gases 13 flow directly to the filter 11 in the exhaust pipe.
  • a purge air channel is provided on the nozzle head 30, which is explained in more detail in connection with FIG.
  • FIG. 2 shows a detail from FIG. 1, namely the oil atomizing nozzle 34.
  • the oil atomizing nozzle 34 consists of a nozzle assembly 31 which carries the actual nozzle or the nozzle head 30.
  • the oil atomizing nozzle 34 is surrounded by a casing 44, which forms an annular space 32 in the region of the nozzle head 30, which contains a throttle point 40 and is connected via an opening 35 in the casing 44 to a purge air source (not shown).
  • a purge air flow 33 is introduced into the purge air channel 32 through the opening 35, whereby it flows into the mixing tube 39, grazing the nozzle head 30 in front of the nozzle opening 36, through the orifice 37 for the combustion air 38.
  • This purge air flow 33 prevents the con clocks combustion gases with the nozzle head 30 and thus always keeps the nozzle opening 56 free of contamination.
  • the throttle point 40 is as close as possible to the nozzle opening, preferably immediately in front of the nozzle opening 36 (not shown), in order to keep the space between the throttle point and the outlet from the environment as small as possible.
  • a pressure peak on the exhaust gas side will then have no space to penetrate into the purge air channel 32 against the purge air, since the purge air can only be compressed slightly in accordance with the small space. This effect can also be achieved by the capillary-like design of the purge air channel end in the vicinity of the nozzle opening.
  • a purge air jet brushes the nozzle opening 56 and the propagation of a pressure wave from the exhaust system to the nozzle opening is prevented.
  • a tubular channel is conceivable, which opens laterally at the nozzle opening, for example into an annular space, which has a small diameter and surrounds the nozzle opening.
  • the combustion air for the internal combustion engine can be used as the purge air source, but the purge air should be biased to about 1.5 times the exhaust gas pressure in order to avoid backflows.
  • compressed air generated by means of a compressor or the like is used as purge air.
  • this requires additional equipment, the compressed air's preserving effect offsets the additional expenditure.
  • dry compressed air which flows continuously through the burner and parts of the exhaust system during the breaks in operation, these components are largely kept free of residues from the exhaust gases, which increases the functionality and the service life of the system.
  • the purge air flow 33 also cools the oil atomizing nozzle 31 and can be switched on whenever the associated internal combustion engine is in operation.
  • the purge air flow can also be used to extract the condensate via suitably arranged suction pipes.
  • suction pipes 50 and 51 are shown in FIG.
  • suction pipe 50 which connects the expansion chamber 80 to the combustion chamber 46 of the burner 20
  • condensate is suctioned off due to the differential pressure prevailing in the two rooms and collects at the bottom of the housing 81.
  • the second suction pipe 51 is arranged in the burner housing 36. Here the suction takes place directly by means of the purge air 33.
  • the vehicle is generally equipped with an optical and / or acoustic display which, depending on the pressure loss of the filter, in conjunction with the engine speed and exhaust gas temperature or other variables, emits a signal which indicates that the filter is about to regenerate must become.
  • the air purge offers a further advantage, namely that a pressure sensor 52 can be arranged in a flow area of the purge air and thus in a cooler area of the exhaust system.
  • a suitable location for this is a space in the burner housing 36, from where the purge air 33 is introduced into the purge air duct 35/32 and which is separated from the combustion chamber 46 by a partition 54.
  • the driver will briefly operate the vehicle in idle mode and close the main flap 82 via operating elements, at the same time open the secondary flap 83 and thus initiate the regeneration process.
  • the regeneration phase can be ended after a prescribed time of between 5 and 15 minutes.
  • the driver will then switch from regeneration mode to driving mode, so that the exhaust gases again reach the filter via the main exhaust pipe. Then the journey or vehicle operation (filter operation) can be continued.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Processes For Solid Components From Exhaust (AREA)
EP87112215A 1986-10-30 1987-08-22 Verfahren zur Regenerierung von Partikelfiltern Expired - Lifetime EP0268026B2 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AT87112215T ATE57248T1 (de) 1986-10-30 1987-08-22 Brenner zur regenerierung von partikelfiltern.
JP62275560A JP2608296B2 (ja) 1986-10-30 1987-10-29 粒子フィルタの再生方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863636967 DE3636967A1 (de) 1986-10-30 1986-10-30 Brenner zur regenerierung von partikelfiltern
DE3636967 1986-10-30

Publications (3)

Publication Number Publication Date
EP0268026A1 EP0268026A1 (de) 1988-05-25
EP0268026B1 EP0268026B1 (de) 1990-10-03
EP0268026B2 true EP0268026B2 (de) 1993-08-18

Family

ID=6312819

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87112215A Expired - Lifetime EP0268026B2 (de) 1986-10-30 1987-08-22 Verfahren zur Regenerierung von Partikelfiltern

Country Status (2)

Country Link
EP (1) EP0268026B2 (enrdf_load_stackoverflow)
DE (2) DE3636967A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10227907B2 (en) 2014-06-03 2019-03-12 Faurecia Emissions Control Technologies, Usa, Llc Mixer and doser cone assembly

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4912920A (en) * 1989-02-02 1990-04-03 Toa Nenryo Kogyo Kabushiki Kaisha Ultrasonic burner system for regenerating a filter
US5353618A (en) 1989-08-24 1994-10-11 Armco Steel Company, L.P. Apparatus and method for forming a tubular frame member
US5157969A (en) * 1989-11-29 1992-10-27 Armco Steel Co., L.P. Apparatus and method for hydroforming sheet metal
US7118613B2 (en) 2004-01-13 2006-10-10 Arvin Technologies, Inc. Method and apparatus for cooling the components of a control unit of an emission abatement assembly
US7628011B2 (en) 2004-01-13 2009-12-08 Emcon Technologies Llc Emission abatement assembly and method of operating the same
US7025810B2 (en) 2004-01-13 2006-04-11 Arvin Technologies, Inc. Method and apparatus for shutting down a fuel-fired burner of an emission abatement assembly
US7243489B2 (en) 2004-01-13 2007-07-17 Arvin Technologies, Inc. Method and apparatus for monitoring engine performance as a function of soot accumulation in a filter
US7685811B2 (en) 2004-01-13 2010-03-30 Emcon Technologies Llc Method and apparatus for controlling a fuel-fired burner of an emission abatement assembly
US8641411B2 (en) 2004-01-13 2014-02-04 Faureua Emissions Control Technologies, USA, LLC Method and apparatus for directing exhaust gas through a fuel-fired burner of an emission abatement assembly
US7908847B2 (en) 2004-01-13 2011-03-22 Emcon Technologies Llc Method and apparatus for starting up a fuel-fired burner of an emission abatement assembly
US7581389B2 (en) 2004-01-13 2009-09-01 Emcon Technologies Llc Method and apparatus for monitoring ash accumulation in a particulate filter of an emission abatement assembly
US8789363B2 (en) 2007-06-13 2014-07-29 Faurecia Emissions Control Technologies, Usa, Llc Emission abatement assembly having a mixing baffle and associated method
DE202008001547U1 (de) 2007-07-24 2008-04-10 Emcon Technologies Germany (Augsburg) Gmbh Baugruppe zur Einbringung eines Reduktionsmittels in die Abgasleitung einer Abgasanlage einer Verbrennungskraftmaschine
DE102014108878A1 (de) * 2014-06-25 2015-12-31 Twintec Technologie Gmbh Verfahren zum Betrieb eines Abgasbrenners
US9828897B2 (en) 2015-04-30 2017-11-28 Faurecia Emissions Control Technologies Usa, Llc Mixer for a vehicle exhaust system
WO2016176076A1 (en) 2015-04-30 2016-11-03 Faurecia Emissions Control Technologies, Usa, Llc Full rotation mixer
US9719397B2 (en) 2015-04-30 2017-08-01 Faurecia Emissions Control Technologies Usa, Llc Mixer with integrated doser cone
US9714598B2 (en) 2015-04-30 2017-07-25 Faurecia Emissions Control Technologies, Usa, Llc Mixer with integrated doser cone
US10933387B2 (en) 2016-10-21 2021-03-02 Faurecia Emissions Control Technologies, Usa, Llc Reducing agent mixer
DE102017109626A1 (de) * 2017-05-04 2018-11-08 Volkswagen Aktiengesellschaft Abgasanlage für einen Verbrennungsmotor sowie Verfahren zum Betreiben einer solchen Abgasanlage
US10787946B2 (en) 2018-09-19 2020-09-29 Faurecia Emissions Control Technologies, Usa, Llc Heated dosing mixer

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2821932A1 (de) * 1978-05-19 1979-11-22 Karl Bodemer Mischeinrichtung zur verbrennung von fluessigen kohlenwasserstoffen, insbesondere heizoel und dieseloel
JPS59158312A (ja) * 1983-02-25 1984-09-07 Hitachi Ltd デイ−ゼルエンジン排気浄化装置
JPS6011617A (ja) * 1983-06-30 1985-01-21 Mitsubishi Electric Corp 車載用燃焼装置
US4557108A (en) * 1983-09-14 1985-12-10 Mitsubishi Denki Kabushiki Kaisha Combustion apparatus for vehicle
JPH0621544B2 (ja) 1983-11-09 1994-03-23 株式会社日立製作所 デイ−ゼルエンジン排気浄化装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10227907B2 (en) 2014-06-03 2019-03-12 Faurecia Emissions Control Technologies, Usa, Llc Mixer and doser cone assembly
US10294843B2 (en) 2014-06-03 2019-05-21 Faurecia Emissions Control Technologies, Usa, Llc Mixer and doser cone assembly

Also Published As

Publication number Publication date
DE3636967A1 (de) 1988-05-19
DE3636967C2 (enrdf_load_stackoverflow) 1989-04-27
DE3765393D1 (de) 1990-11-08
EP0268026B1 (de) 1990-10-03
EP0268026A1 (de) 1988-05-25

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