DE102007019999A1 - Evaporator unit for introducing an oxidizable substance in the gas stream of an exhaust pipe - Google Patents

Evaporator unit for introducing an oxidizable substance in the gas stream of an exhaust pipe Download PDF

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Publication number
DE102007019999A1
DE102007019999A1 DE200710019999 DE102007019999A DE102007019999A1 DE 102007019999 A1 DE102007019999 A1 DE 102007019999A1 DE 200710019999 DE200710019999 DE 200710019999 DE 102007019999 A DE102007019999 A DE 102007019999A DE 102007019999 A1 DE102007019999 A1 DE 102007019999A1
Authority
DE
Germany
Prior art keywords
exhaust pipe
oxidizable substance
evaporator unit
introducing
gas stream
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Withdrawn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
DE200710019999
Other languages
German (de)
Inventor
Wolfgang Dr. Hahnl
Tobias Danner
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.)
Faurecia Emissions Control Technologies Germany GmbH
Original Assignee
ArvinMeritor Emissions Technologies GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ArvinMeritor Emissions Technologies GmbH filed Critical ArvinMeritor Emissions Technologies GmbH
Priority to DE200710019999 priority Critical patent/DE102007019999A1/en
Priority to PCT/EP2008/003308 priority patent/WO2008135176A1/en
Publication of DE102007019999A1 publication Critical patent/DE102007019999A1/en
Withdrawn legal-status Critical Current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
    • F01N3/0253—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 adding fuel to exhaust gases
    • 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
    • F01N3/36—Arrangements for supply of additional fuel
    • 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
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • 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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • 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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F01N2610/107—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance using glow plug heating elements
    • 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
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus

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)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

Eine Verdampfereinheit zur Einbringung einer oxidierbaren Substanz in den Gasstrom einer Abgasleitung, mit einem Gehäuse, das einen in die Abgasleitung ragenden Abschnitt mit einer Einlaßöffnung aufweist, und einem Heizelement, das in einer im Gehäuse ausgebildeten Kammer angeordnet ist, ist dadurch gekennzeichnet, daß der in die Abgasleitung ragende Abschnitt nahe der Einlaßöffnung ein Abfangelement aufweist, das verhindert, daß Tropfen der oxidierbaren Substanz zur Innenwandung der Abgasleitung gelangen.An evaporator unit for introducing an oxidizable substance into the gas flow of an exhaust pipe, comprising a housing having a portion projecting into the exhaust pipe with an inlet opening, and a heating element which is arranged in a chamber formed in the housing, characterized in that the exhaust pipe projecting portion near the inlet opening has a catch element which prevents drops of the oxidizable substance to reach the inner wall of the exhaust pipe.

Description

Die Erfindung betrifft eine Verdampfereinheit zur Einbringung einer oxidierbaren Substanz in den Gasstrom einer Abgasleitung, mit einem Gehäuse, das einen in die Abgasleitung ragenden Abschnitt mit einer Auslaßöffnung aufweist, und einem Heizelement, das in einer im Gehäuse ausgebildeten Kammer angeordnet ist.The The invention relates to an evaporator unit for introducing a oxidizable substance in the gas stream of an exhaust pipe, with a Housing, the has a projecting into the exhaust pipe section with an outlet opening, and a heating element disposed in a chamber formed in the housing is.

Derartige Verdampfereinheiten sind bekannt und dienen beispielsweise dazu, Kraftstoff in den Abgasstrom stromaufwärts eines Partikelfilters mit vorgeschaltetem Oxidationskatalysator einzubringen, um auf diese Weise eine Regeneration des Partikelfilters zu bewirken.such Evaporator units are known and serve, for example, Fuel in the exhaust stream upstream of a particulate filter with introduce upstream oxidation catalyst in order to this Way to cause a regeneration of the particulate filter.

Unter bestimmten Betriebsbedingungen können kleine Tropfen der oxidierbaren Substanz die Auslaßöffnung des in den Abgasleitung ragenden Abschnitts erreichen. Diese geraten in einen stromabwärts des in die Abgasleitung ragenden Abschnitts gebildeten Wirbel und fließen schließlich an der Außenwand des Abschnitts nach unten, wo sie sich an der Innenwandung der Abgasleitung sammeln. Die Verdampfung dieser Tropfen ist sehr zeitintensiv und hängt von der Oberflächentemperatur der Leitungswandung in diesem Bereich ab.Under certain operating conditions small drops of oxidizable substance the outlet of the reach the section projecting into the exhaust pipe. These are advised in a downstream of the protruding into the exhaust pipe section vortex and flow after all on the outside wall down the section where it joins the inner wall of the exhaust pipe collect. The evaporation of these drops is very time consuming and depends on the surface temperature the conduit wall in this area.

Die Aufgabe der Erfindung besteht darin, für eine gleichmäßigere und schnellere Verdampfung der oxidierbaren Substanz zu sorgen.The The object of the invention is to provide a more even and to provide faster evaporation of the oxidizable substance.

Erfindungsgemäß weist dazu bei einer Verdampfereinheit der eingangs genannten Art der in die Abgasleitung ragende Abschnitt nahe der Auslaßöffnung ein Abfangelement auf, das verhindert, daß Tropfen der oxidierbaren Substanz zur Innenwandung der Abgasleitung gelangen. Da sich die Tropfen nun nicht mehr an der Innenwandung der Abgasleitung absetzen können, wird eine gleichmäßigere und schnellere Verdampfung erreicht.According to the invention to an evaporator unit of the type mentioned in the into the exhaust pipe projecting portion near the outlet opening Intercepting element that prevents drops of oxidizable Substance get to the inner wall of the exhaust pipe. Since the Do not drop drops on the inner wall of the exhaust pipe anymore can, will be a smoother and faster Evaporation achieved.

Die erfindungsgemäße Verdampfereinheit inklusive spezieller Ausgestaltungen wird anhand der beigefügten 1 bis 7 erläutert.The evaporator unit according to the invention including special embodiments will be described with reference to the attached 1 to 7 explained.

1 zeigt eine Verdampfereinheit 10, deren Gehäuse 12 mit einem Abschnitt 14 in eine Abgasleitung 16 ragt und eine Auslaßöffnung 18 aufweist. Im Inneren des Gehäuses 12 ist eine Kammer ausgebildet, in der ein Heizelement 20 in Form einer Glühkerze angeordnet ist. Das Gehäuse 12 weist außerdem eine Einlaßöffnung 22 für Kraftstoff auf. Der Pfeil A bezeichnet die Hauptströmungsrichtung des Abgases. Der Abschnitt 14 hat nahe der Auslaßöffnung 18 (hier genau unterhalb der Auslaßöffnung 18) ein Abfangelement 24 in Form eines pfannenartig ausgebildeten Tropfenfängers. Wenn nur eine kleine Menge von Tropfen aus der Auslaßöffnung 18 austritt, sammeln sie sich im Tropfenfänger und verdampfen in der heißen Umgebung des Abgases. 1 shows an evaporator unit 10 whose housing 12 with a section 14 in an exhaust pipe 16 protrudes and an outlet opening 18 having. Inside the case 12 a chamber is formed in which a heating element 20 is arranged in the form of a glow plug. The housing 12 also has an inlet opening 22 for fuel. The arrow A indicates the main flow direction of the exhaust gas. The section 14 has near the outlet 18 (here just below the outlet 18 ) an intercepting element 24 in the form of a pan-shaped drip. If only a small amount of drops from the outlet 18 leaking, they collect in the drip and evaporate in the hot environment of the exhaust gas.

Um eine größere Oberfläche für die Verdampfung der Tropfen bereitzustellen, kann, wie in 2 dargestellt, ein Drahtgestrick oder -geflecht, ein Schaum oder irgendein anderes poröses Material verwendet werden, das als Abfangelement 24 dient und die Tropfen auffängt. In 2 ist mit 26 die in der Kammer 28 aufsteigende Flüssigkeit bezeichnet. 30 bezeichnet einen an der Auslaßöffnung gebildeten Tropfen. Der aus der Auslaßöffnung 18 austretende Dampf trägt das Bezugszeichen 32.In order to provide a larger surface for the evaporation of the drops, as in 2 shown, a wire mesh or braid, a foam or any other porous material may be used as the intercepting element 24 serves and the drops field. In 2 is with 26 those in the chamber 28 ascending liquid called. 30 denotes a drop formed at the outlet opening. The from the outlet opening 18 emerging steam bears the reference numeral 32 ,

Die 3 bis 5 zeigen eine weitere Ausgestaltung der Verdampfereinheit 10. Hier wird als Abfangelement 24 eine ebene Führungsplatte verwendet. Diese ist ebenfalls unterhalb der Auslaßöffnung 18 angebracht und steigt in Strömungsrichtung A des Abgases gesehen an. Die Tropfen 30, die die Wirbelzone 34 der Strömung 36 auf der stromabwärtigen Seite des Abschnitts 14 erreichen, werden zur Außenseite der Führungsplatte geführt. Hier hat das Abgas eine höhere Strömungsgeschwindigkeit. In 5 ist mit 38 die Strömungstrennung aufgrund des in die Abgasleitung ragenden Abschnitts 14 bezeichnet. Durch den Geschwindigkeitsunterschied zwischen den Tropfen und dem Abgas erfolgt eine bessere Verdampfung der flüssigen Substanz, insbesondere des Kraftstoffs.The 3 to 5 show a further embodiment of the evaporator unit 10 , Here is called interception 24 used a flat guide plate. This is also below the outlet 18 attached and increases in the flow direction A of the exhaust gas seen. The drops 30 that the vortex zone 34 the flow 36 on the downstream side of the section 14 reach are guided to the outside of the guide plate. Here the exhaust gas has a higher flow velocity. In 5 is with 38 the flow separation due to the protruding into the exhaust pipe section 14 designated. Due to the difference in velocity between the drops and the exhaust gas, a better evaporation of the liquid substance, in particular of the fuel, takes place.

Die in 6 gezeigte Ausgestaltung weist einen in die Abgasleitung ragenden Abschnitt 14 auf, der im Querschnitt oval geformt ist, um den vorgenannten Wirbelbereich stromabwärts des Abschnitts 14 zu vermeiden. Durch Verwendung einer zusätzlichen Führungsplatte als Abfangelement 24, wie in 7 dargestellt, das unter einem spitzen Winkel zur Hauptströmungsrichtung A des Abgases angeordnet ist, kann zudem ein veränderter Wirbel 40 zur besseren Vermischung des Dampfes mit dem Abgasstrom erzeugt werden.In the 6 embodiment shown has a projecting into the exhaust pipe section 14 which is oval in cross-section to the aforementioned vortex region downstream of the section 14 to avoid. By using an additional guide plate as a capture element 24 , as in 7 which is arranged at an acute angle to the main flow direction A of the exhaust gas, may also be an altered vortex 40 be created for better mixing of the steam with the exhaust stream.

Insgesamt läßt sich durch die erfindungsgemäße Ausgestaltung eine höhere Leistung der Verdampfereinheit 10 erzielen. Außerdem bewirkt die erfindungsgemäße Verdampfereinheit 10 eine bessere Vermischung der eingebrachten oxidierbaren Substanz mit dem Abgasstrom.Overall, a higher performance of the evaporator unit can be achieved by the inventive design 10 achieve. In addition, the evaporator unit according to the invention causes 10 a better mixing of the introduced oxidizable substance with the exhaust gas stream.

Claims (1)

Verdampfereinheit zur Einbringung einer oxidierbaren Substanz in den Gasstrom einer Abgasleitung, mit einem Gehäuse, das einen in die Abgasleitung ragenden Abschnitt mit einer Einlaßöffnung aufweist, und einem Heizelement, das in einer im Gehäuse ausgebildeten Kammer angeordnet ist, dadurch gekennzeichnet, daß der in die Abgasleitung ragende Abschnitt nahe der Einlaßöffnung ein Abfangelement aufweist, das verhindert, daß Tropfen der oxidierbaren Substanz zur Innenwandung der Abgasleitung gelangen.An evaporator unit for introducing an oxidizable substance into the gas flow of an exhaust pipe, comprising a housing having a section projecting into the exhaust pipe with an inlet opening, and a heating element arranged in a chamber formed in the housing, characterized in that the protruding into the exhaust pipe section near the inlet opening has a catch element which prevents drops of the oxidizable substance to reach the inner wall of the exhaust pipe.
DE200710019999 2007-04-27 2007-04-27 Evaporator unit for introducing an oxidizable substance in the gas stream of an exhaust pipe Withdrawn DE102007019999A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE200710019999 DE102007019999A1 (en) 2007-04-27 2007-04-27 Evaporator unit for introducing an oxidizable substance in the gas stream of an exhaust pipe
PCT/EP2008/003308 WO2008135176A1 (en) 2007-04-27 2008-04-24 Evaporator unit for introducing an oxidisable substance into the gas stream of an exhaust line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710019999 DE102007019999A1 (en) 2007-04-27 2007-04-27 Evaporator unit for introducing an oxidizable substance in the gas stream of an exhaust pipe

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DE102007019999A1 true DE102007019999A1 (en) 2008-10-30

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DE200710019999 Withdrawn DE102007019999A1 (en) 2007-04-27 2007-04-27 Evaporator unit for introducing an oxidizable substance in the gas stream of an exhaust pipe

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WO (1) WO2008135176A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2966512A1 (en) 2010-10-21 2012-04-27 Coutier Moulage Gen Ind DEVICE FOR INTRODUCING A LIQUID ADDITIVE IN A THERMAL ENGINE EXHAUST LINE

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS601314A (en) * 1983-06-20 1985-01-07 Nissan Motor Co Ltd Post-treatment device for fine particles exhausted from internal-combustion engine
US6601385B2 (en) * 2001-10-17 2003-08-05 Fleetguard, Inc. Impactor for selective catalytic reduction system
DE102004004738A1 (en) * 2004-01-30 2005-08-18 Robert Bosch Gmbh Method and device for the after-treatment of an exhaust gas of an internal combustion engine
SE528119C2 (en) * 2004-08-06 2006-09-05 Scania Cv Ab Arrangement for supplying a medium to an exhaust line of an internal combustion engine
DE102005006260A1 (en) * 2005-02-11 2006-08-24 Daimlerchrysler Ag Addition device for adding reducing agent in an exhaust pipe of an internal combustion engine

Also Published As

Publication number Publication date
WO2008135176A1 (en) 2008-11-13

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Date Code Title Description
8127 New person/name/address of the applicant

Owner name: EMCON TECHNOLOGIES GERMANY (AUGSBURG) GMBH, 86, DE

8139 Disposal/non-payment of the annual fee