DE102008049685A1 - Exhaust gas aftertreatment arrangement for motor vehicle, has urea tank connected with supplying device over supply pipe, and heated portion staying in thermal contact with exhaust gas pipe to heat supply pipe with waste heat of exhaust gas - Google Patents
Exhaust gas aftertreatment arrangement for motor vehicle, has urea tank connected with supplying device over supply pipe, and heated portion staying in thermal contact with exhaust gas pipe to heat supply pipe with waste heat of exhaust gas Download PDFInfo
- Publication number
- DE102008049685A1 DE102008049685A1 DE102008049685A DE102008049685A DE102008049685A1 DE 102008049685 A1 DE102008049685 A1 DE 102008049685A1 DE 102008049685 A DE102008049685 A DE 102008049685A DE 102008049685 A DE102008049685 A DE 102008049685A DE 102008049685 A1 DE102008049685 A1 DE 102008049685A1
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- DE
- Germany
- Prior art keywords
- exhaust gas
- exhaust
- supply pipe
- pipe
- exhaust pipe
- 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.)
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Classifications
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- 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]
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- 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
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using heat
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- 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
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
-
- 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
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- 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
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
Abstract
Description
Die Erfindung betrifft eine Abgasnachbehandlungsanordnung für einen Kraftwagen nach dem Oberbegriff von Patentanspruch 1.The The invention relates to an exhaust aftertreatment arrangement for A motor vehicle according to the preamble of claim 1.
Gattungsgemäße Abgasnachbehandlungsanordnungen sind bekannt und dienen der Reduktion von Stickoxidemissionen insbesondere von Dieselmotoren. 3-Wege-Katalysatoren, wie sie bei Ottomotoren verwendet werden, können aufgrund des Sauerstoffüberschusses im dieselmotorischen Abgas hierfür nicht eingesetzt werden. Um eine Reduktion der Stickoxidemissionen von Dieselmotoren zu erzielen, werden dort selektiv arbeitende SCR-Katalysatoren (Selective Catalytic Reduction Katalysator) eingesetzt. Im Abgasdieselmotor anfallende Stickoxide werden mittels solcher Katalysatoren durch Zugabe eines Reduktionsmittels zu Stickstoff und Wasser reduziert. Als Reduktionsmittel wird dabei Ammoniak eingesetzt. Da reiner Ammoniak im gasförmigen Zustand und auch Ammoniaklösungen schwer zu handhaben sind, erfolgt eine Zuführung des reduzierenden Ammoniaks in Form einer wässrigen Harnstofflösung. Die Harnstofflösung ist in einem Harnstofftank bevorratet und wird über eine Zuführleitung zu einer Einrichtung zum Zuführen der Harnstofflösung in die Abgasleitung des Kraftwagens geleitet. Aufgrund der Temperaturen in der Abgasleitung verdampft die Harnstofflösung beim Zuführen, der Harnstoff wird in Kohlendioxid und Ammoniak zersetzt.generic Exhaust gas aftertreatment arrangements are known and serve the reduction of Nitrogen oxide emissions, especially of diesel engines. 3-way catalysts, as used in gasoline engines, due to the excess of oxygen in the diesel engine exhaust gas for this purpose not be used. To a reduction of nitrogen oxide emissions diesel engines, there are selective SCR catalysts (Selective catalytic reduction catalyst) used. In the exhaust diesel engine accumulating nitrogen oxides are by means of such catalysts Addition of a reducing agent reduced to nitrogen and water. As a reducing agent while ammonia is used. Because pure ammonia in the gaseous state and also ammonia solutions are difficult to handle, there is a feed of the reducing Ammonia in the form of an aqueous urea solution. The urea solution is stored in a urea tank and becomes a device via a supply line for feeding the urea solution into the exhaust pipe of the motor vehicle. Due to the temperatures in the exhaust pipe evaporates the urea solution during feeding, the Urea is decomposed into carbon dioxide and ammonia.
Aus
der
Es ist somit Aufgabe der vorliegenden Erfindung, eine Abgasnachbehandlungsanordnung der eingangs genannten Art so weiter zu entwickeln, dass ein Beheizen einer Harnstoffleitung auf verbesserte Weise ermöglicht wird.It is therefore an object of the present invention, an exhaust aftertreatment device of the type mentioned above to develop so that a heating allows a urea line in an improved manner becomes.
Diese Aufgabe wird durch eine Abgasnachbehandlungsanordnung mit den Merkmalen des Patentanspruchs 1 gelöst. Diese umfasst einen Harnstofftank, welcher über eine Zuführleitung mit einer Einrichtung zum Zuführen einer Harnstofflösung in eine Abgasleitung eines Kraftwagens verbunden ist. Die Einrichtung zum Zuführen der Harnstofflösung ist dabei in der Regel als Düse ausgeprägt, über welche dosierte Mengen der Harnstofflösung, gegebenenfalls zusammen mit Druckluft aerosolisiert in die Abgasleitung eingesprüht werden können. Zumindest ein Teilbereich der Zuführleitung ist dabei beheizbar.These Task is by an exhaust aftertreatment device with the features of claim 1. This includes a urea tank, which via a supply line with a device for feeding a urea solution into an exhaust pipe a motor vehicle is connected. The device for feeding The urea solution is usually as a nozzle pronounced over which metered amounts of the urea solution, optionally aerosolized together with compressed air into the exhaust pipe can be sprayed. At least one subarea the supply line is heated.
Erfindungsgemäß ist nun vorgesehen, dass der beheizbare Teilbereich zum Beheizen der Zuführleitung mittels Abwärme des Abgases in thermischem Kontakt mit der Abgasleitung steht. Dies überwindet die genannten Nachteile des Standes der Technik. Zum einen kann eine kürzere Leitungsführung für die Zuführleitung gewählt werden, da diese ohnehin in den Bereich der Abgasleitung geführt werden muss, um mit der Einrichtung zum Zuführen von Harnstofflösung verbunden werden zu können. Weiterhin sind die Temperaturen in der Abgasleitung deutlich höher als jene in einer Kraftstoffrücklaufleitung. Auch der Massenstrom von Abgas in der Abgasleitung ist höher als derjenige von Kraftstoff in der Kraftstoffrücklaufleitung. Dadurch wird eine hinreichende Wärmekapazität zur Verfügung gestellt, um eine hinreichende Erwärmung der Harnstofflösung zu gewährleisten. Über den Schutz vor Einfrieren der Harnstofflösung in der Zuführleitung hinaus kann so vorteilhaft gewährleistet werden, dass bei der Abgabe der Harnstofflösung in den Abgasstrom der Abgasleitung vom Abgas weniger Wärme auf die versprühte Harnstofflösung übertragen werden muss. Damit wird dem Abgas weniger Wärme entzogen, was die Wirkung eines nachgestalteten SCR-Katalysators verbessert. Bei entsprechend hoher Aufheizung der Harnstofflösung in der Zuführleitung kann bereits in der Zuführleitung eine Hydrolyse der Harnstofflösung in Ammoniak und Kohlendioxid erzielt werden. Damit wird unmittelbar reaktives Reduktionsmittel in den Abgasstrom eingebracht, ohne dass eine vorgelagerte Reaktion im Abgasstrom selbst stattfinden muss.According to the invention now provided that the heatable portion for heating the Supply line by means of waste heat of the exhaust gas in thermal Contact with the exhaust pipe is. This overcomes the mentioned disadvantages of the prior art. For one thing, one can shorter cable routing for the supply line be chosen, as this anyway in the field of exhaust pipe must be guided to with the device for feeding be connected by urea solution. Furthermore, the temperatures in the exhaust pipe are much higher as those in a fuel return line. Also the mass flow Exhaust gas in the exhaust pipe is higher than that of Fuel in the fuel return line. This will a sufficient heat capacity available provided sufficient heating of the urea solution to ensure. About the protection against freezing the urea solution in the feed line addition can be guaranteed so advantageous that in the Delivery of the urea solution in the exhaust gas stream of the exhaust pipe transferred less heat from the exhaust gas to the sprayed urea solution must become. Thus, less heat is removed from the exhaust gas, which improves the effect of a redesigned SCR catalyst. at correspondingly high heating of the urea solution in the Feed line can already in the feed hydrolysis of the urea solution into ammonia and carbon dioxide be achieved. This immediately becomes a reactive reducing agent introduced into the exhaust stream, without any upstream reaction must take place in the exhaust stream itself.
Es hat sich dabei als besonders vorteilhaft herausgestellt, die Zuführleitung so auszuführen, dass der beheizbare Teilbereich der Zuführleitung im Wesentlichen spiralförmig eine Mantelfläche der Abgasleitung umläuft. Damit wird eine größere Wärmetauscherfläche zur Verfügung gestellt, über welche Wärmeenergie aus dem Abgas in die Harnstofflösung übertreten kann. Bei hinreichend hohem Temperaturtransport vom Abgas in die Harnstofflösung kann es also bereits in der Zuführleitung zu einer Hydrolyse des Harnstoffs kommen, so dass sich ein Gleichgewicht zwischen einer Gas und einer Flüssigkeitsphase bildet, wobei vorzugsweise eine Dampfsättigungskonzentration von Ammoniak in der Gasphase erreicht wird.It has been found to be particularly advantageous to design the feed line so that the heatable portion of the feed line essentially spirals a circumferential surface of the exhaust pipe circulates. This provides a larger heat exchanger surface over which heat energy can pass from the exhaust gas into the urea solution. At a sufficiently high temperature transport from the exhaust gas into the urea solution may therefore already come in the feed line to a hydrolysis of the urea, so that forms a balance between a gas and a liquid phase, preferably a vapor saturation concentration of ammonia in the gas phase is achieved.
Es ist weiterhin vorteilhaft, den beheizbaren Teilbereich der Zuführleitung auf einer der Abgasleitung abgewandten Seite von einem Schutzrohr zu umgeben. In einer besonders bevorzugten Ausführungsform verläuft das Schutzrohr koaxial mit der Abgasleitung, wobei eine Innenfläche des Schutzrohres zu einer Mantelfläche der Abgasleitung beabstandet ist. In dem gebildeten Hohlraum ist schließlich der beheizbare Teilbereich der Zuführleitung angeordnet. Dies schützt die Zuführleitung von Wärmeverlusten an ihrem dem Abgasrohr abgewandten Seite und gleichzeitig vor mechanischen Beschädigungen, beispielsweise durch Steinschlag. Auch im Falle eines Unfalls kann das unkontrollierte Austreten von heißen Ammoniakdämpfen, welche gegebenenfalls ein Sicherheitsrisiko darstellen könnten, vermieden werden.It is also advantageous, the heatable portion of the supply on a side facing away from the exhaust pipe from a protective tube to surround. In a particularly preferred embodiment the protective tube runs coaxially with the exhaust pipe, wherein an inner surface of the protective tube to a lateral surface the exhaust pipe is spaced. In the cavity formed Finally, the heatable portion of the supply arranged. This protects the feed line from Heat losses on their side facing away from the exhaust pipe and at the same time against mechanical damage, for example by rockfall. Even in the case of an accident, the uncontrolled Exiting hot ammonia vapors, which optionally could be a security risk.
Es hat sich weiterhin als vorteilhaft erwiesen, in Strömungsrichtung der Harnstofflösung vor dem beheizbaren Teilbereich ein Rückschlagventil in der Zuführleitung anzuordnen. Durch eine partielle Hydrolyse des Harnstoffs in der Zuführleitung und ein damit einhergehendes Verdampfen des wässrigen Anteils der Harnstofflösung, kann im beheizbaren Teilbereich ein Überdruck entstehen. Durch das Rückschlagventil wird vorteilhaft vermieden, dass Wasserdampf, Ammoniak und CO2 aus der Harnstoffhydrolyse, bzw. unhydrolysierte und unverdampfte Harnstofflösung in Richtung des Harnstofftanks zurückgedrückt wird. Das Rückschlagventil ermöglicht so die Aufrechterhaltung einer Strömung der Harnstofflösung in die gewünschte Richtung, also auf die Einrichtung zum Zuführen der Harnstofflösung in die Abgasleitung zu.It has also proven to be advantageous in the flow direction the urea solution before the heated portion To arrange check valve in the supply line. By a partial hydrolysis of the urea in the feed line and concomitant evaporation of the aqueous portion the urea solution, can in the heated part of a positive pressure arise. By the check valve is advantageous avoided that water vapor, ammonia and CO2 from the urea hydrolysis, or unhydrolysed and unevaporated urea solution in Direction of the urea tank is pushed back. The check valve thus allows the maintenance a flow of urea solution into the desired Direction, ie the means for supplying the urea solution into the exhaust pipe too.
Die Erfindung betrifft schließlich weiterhin einen Kraftwagen mit einer Abgasnachbehandlungsanordnung der beschriebenen Art.The Finally, the invention relates to a motor vehicle with an exhaust aftertreatment arrangement of the type described.
Im Folgenden soll anhand der Zeichnung die Erfindung und ihre Ausführungsform näher erläutert werden. Die einzige Figur zeigt hierbei eine schematisch Darstellung eines Ausführungsbeispiels einer erfindungsgemäßen Abgasnachbehandlungsanordnung.in the The following is to the invention and its embodiment with reference to the drawing be explained in more detail. The only figure shows Here is a schematic representation of an embodiment an exhaust aftertreatment arrangement according to the invention.
Die
im Ganzen mit
In
einem Teilbereich
Das
Schutzrohr
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- - EP 1316689 A2 [0003, 0003] - EP 1316689 A2 [0003, 0003]
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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DE102008049685A DE102008049685A1 (en) | 2008-09-30 | 2008-09-30 | Exhaust gas aftertreatment arrangement for motor vehicle, has urea tank connected with supplying device over supply pipe, and heated portion staying in thermal contact with exhaust gas pipe to heat supply pipe with waste heat of exhaust gas |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008049685A DE102008049685A1 (en) | 2008-09-30 | 2008-09-30 | Exhaust gas aftertreatment arrangement for motor vehicle, has urea tank connected with supplying device over supply pipe, and heated portion staying in thermal contact with exhaust gas pipe to heat supply pipe with waste heat of exhaust gas |
Publications (1)
Publication Number | Publication Date |
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DE102008049685A1 true DE102008049685A1 (en) | 2009-06-10 |
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Application Number | Title | Priority Date | Filing Date |
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DE102008049685A Withdrawn DE102008049685A1 (en) | 2008-09-30 | 2008-09-30 | Exhaust gas aftertreatment arrangement for motor vehicle, has urea tank connected with supplying device over supply pipe, and heated portion staying in thermal contact with exhaust gas pipe to heat supply pipe with waste heat of exhaust gas |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010021058A1 (en) * | 2010-05-19 | 2011-11-24 | Gm Global Technology Operations Llc (N.D.Ges.D. Staates Delaware) | Device for heating reducing agent in reducing agent container of exhaust gas after-treatment plant of internal-combustion engine for vehicle, has heating element, which is connected with exhaust gas line |
EP3267003B1 (en) * | 2016-07-05 | 2020-03-04 | RENAULT s.a.s. | Passive heating system of an scr system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1316689A2 (en) | 2001-12-03 | 2003-06-04 | PUReM Abgassysteme GmbH & Co. KG | Reducing agent metering device |
-
2008
- 2008-09-30 DE DE102008049685A patent/DE102008049685A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1316689A2 (en) | 2001-12-03 | 2003-06-04 | PUReM Abgassysteme GmbH & Co. KG | Reducing agent metering device |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010021058A1 (en) * | 2010-05-19 | 2011-11-24 | Gm Global Technology Operations Llc (N.D.Ges.D. Staates Delaware) | Device for heating reducing agent in reducing agent container of exhaust gas after-treatment plant of internal-combustion engine for vehicle, has heating element, which is connected with exhaust gas line |
EP3267003B1 (en) * | 2016-07-05 | 2020-03-04 | RENAULT s.a.s. | Passive heating system of an scr system |
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OAV | Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1 | ||
R005 | Application deemed withdrawn due to failure to request examination |