WO2008080694A1 - Élément de chauffage de ventilation pour réservoir d'agent de réduction - Google Patents

Élément de chauffage de ventilation pour réservoir d'agent de réduction Download PDF

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Publication number
WO2008080694A1
WO2008080694A1 PCT/EP2007/062438 EP2007062438W WO2008080694A1 WO 2008080694 A1 WO2008080694 A1 WO 2008080694A1 EP 2007062438 W EP2007062438 W EP 2007062438W WO 2008080694 A1 WO2008080694 A1 WO 2008080694A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid line
tank
reducing agent
heater
line
Prior art date
Application number
PCT/EP2007/062438
Other languages
German (de)
English (en)
Inventor
Rainer Haeberer
Matthias Horn
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Priority to EP07822658A priority Critical patent/EP2108076A1/fr
Publication of WO2008080694A1 publication Critical patent/WO2008080694A1/fr

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
    • F01N3/08—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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • 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
    • 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
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • 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
    • F01N2610/1466—Means for venting air out of conduits or tanks
    • 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
    • F01N2610/1486—Means to prevent the substance from freezing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • a reducing agent is injected into the exhaust stream to convert the nitrogen oxides by means of a catalyst into elemental nitrogen and water.
  • liquid reducing agent is used in which the active substance, for example urea, is dissolved in water.
  • the reducing agent is stored in a tank, from which it is taken with a feed pump.
  • antifreeze is added so that conventional liquid reducing agents freeze between -11 C ° and -40 C ° . Since the nitrogen oxides must be reduced even at low temperatures, the reducing agent must first be thawed.
  • a heater is attached to the tank bottom, which thaws the frozen reducing agent. The agent is first liquefied in the area close to the heating, wherein this thawed reducing agent is still surrounded by a thick ice shell. The aspiration of the liquid reductant so entrapped would result in a vacuum, so that promotion of the reductant will not commence until the heater has thawed most of the frozen mass and ice. Therefore, the start of operation of the decompression system is significantly delayed.
  • a ventilation heating is provided in addition to the tank heating, which is arranged so that through the ice sheet through a pressure compensation can take place.
  • a corresponding channel which serves for ventilation and thus compensates for the volume reduction by the delivered liquid reducing agent. In this way, it is not necessary to wait with the start of the denitrification system until the tank heater has thawed the reducing agent so far that the ice cover has a gap through which a pressure equalization can take place.
  • Figure 1 is a sectional view of a tank according to the prior art.
  • Figure 2 is a sectional view of a reducing agent tank, with a heated
  • Fluid line is provided, which is carried out according to a first aspect of the present invention.
  • Figure 3 is a sectional view of a reducing agent tank, with a heated
  • Fluid line is provided, which is designed according to a second aspect of the invention.
  • FIG. 1 shows a cross section through a reducing agent tank according to the prior art.
  • the reducing agent tank 100 comprises a delivery line 102 for conveying the reducing agent 106, 108 present in the tank.
  • the volume of already transported reducing agent is occupied by air 110.
  • a heater 104 which converts frozen reductant 108 into liquid reductant 106, which may then be conveyed.
  • the liquid reductant 106 is trapped. In this case, due to the vacuum effect of the ice sheet 108, no liquid reducing agent can be taken although it is present.
  • a fluid line for a reducing agent tank which can be heated by means of a ventilation heater.
  • the fluid line is intended to convey the reducing agent liquefied by the tank heater 204.
  • the fluid line 202 according to the invention carries a ventilation heater 220, which extends along the fluid line 202. If the ventilation heating is activated, a continuous region of the frozen reducing agent extending longitudinally to the fluid line is heated and liquefied. This area forms a channel through which air can flow which compensates for the volume corresponding to the delivered liquid reductant. In this way, the closed ice shell 208 does not form a hermetic enclosure for the liquid reductant 206, which prevents the conveyance of the enclosed liquid reductant due to vacuum suction.
  • the heating is provided throughout a longitudinal section of the delivery line 202 which extends between the liquid reducing agent 206 and the ice cover.
  • the ventilation heater extends along a route that also allows ventilation when (just at the tank heater 204) only a little of the reducing agent has been liquefied and the tank is filled to the ceiling of the tank.
  • the ventilation heater runs concentrically around the fluid line and surrounds it.
  • the heater can run along an outer side of the fluid line, for example in the form of a rod, which is arranged next to the fluid line.
  • the suction end of the fluid line 202 is near the heater 204.
  • an electric heater is used as the ventilation heater.
  • the electric heater is a wire that is wound around the fluid line, and thus circumferentially surrounds the fluid line.
  • a heating foil or a heating layer can also be used.
  • the fluid line comprises a ventilation heater, which extends longitudinally to the fluid line, is arranged parallel thereto and is connected to it in a heat-conducting manner, for example by mechanical contact.
  • the ventilation heater may consist of a carrier, for example a rod-shaped tube, which has a heating wire, a heating foil or a heating layer.
  • the ventilation heater extends along the entire fluid line.
  • a reducing agent tank is also provided, in which the fluid line equipped with the ventilation heating has, as described above, an intake opening which is arranged in the vicinity of the tank heater. Since the reducing agent melts in the area near the tank heater first, this allows the operation of the decoupling system shortly after activation of the tank heater and the ventilation heater.
  • the ventilation heater can be made in one piece with the fluid line, for example by being embedded in the wall of the fluid line.
  • the ventilation heater is tubular and forms an internal passage in which the fluid conduit is located.
  • the liquefaction of a continuous thin layer 222 around the fluid line frozen in the reducing agent is sufficient to allow the pressure compensation of the enclosed liquid reducing agent in the promotion.
  • the ventilation heating according to the invention such a layer can be generated in a very short time.
  • FIG. 3 shows a reducing agent tank with a fluid line formed according to a second aspect of the invention.
  • a ventilation line is provided in the embodiment shown in FIG. 3, which is arranged spatially separated from the delivery line.
  • the embodiment shown in FIG. 3 thus comprises, according to a second aspect of the invention, a fluid line 330 which serves as a ventilation line.
  • the ventilation heater 332 arranged on this ventilation line 330 serves to thaw the reducing agent present in the ventilation line.
  • the vent line includes a vent opening disposed in the tank interior near the tank heater 304. Therefore, if the tank heater 304 is activated, liquid reductant is generated in the vicinity of the heater, which is enclosed by frozen reductant 308. Since the ventilation opening is arranged close to the tank heating and thus is in fluid communication with the liquid reducing agent, the volume of the liquid reducing agent which is conveyed can be compensated by the ventilation line by the intake of ambient air.
  • a suction port of the delivery line 302 is provided in the vicinity of the tank heater 304.
  • the delivery line passes through the tank bottom into the interior of the tank 300.
  • the delivery line 302 is equipped with a delivery heater 320. tats, which ensures the liquefaction of the reducing agent in the delivery line.
  • vent opening of the vent conduit 330 is spaced apart from the adjacent mammalian opening of the delivery conduit 302 to prevent air entering the vent from being drawn in from the delivery conduit 302.
  • the vent line 330 which is formed with the ventilation heater 332, preferably opens into the environment at a location which is above the tank ceiling to prevent unwanted leakage of the reducing agent. Reducing agent located in the ventilation duct is prevented from escaping by gravity.
  • the ventilation heater 332 can completely surround or be arranged next to the ventilation line 330, so that it is ensured that the ventilation line 330 can generate a continuous channel over its entire length, through which air can flow.
  • the vent heater 332 may be a wire wrapped around the vent conduit 330. Alternatively, a correspondingly arranged nearby heating rod can be used.
  • a heating element a heating foil or a heating layer may also be used.
  • the heat is generated by electric current.
  • the venting line 330 creates a connection between the liquid reducing agent 306 enclosed in the tank 300 and the direct environment
  • the embodiment shown in FIG. 2 forms a channel between the airspace 210 within the airspace 210 Tank 200 and the enclosed liquid reducing agent 206 creates.
  • the embodiment shown in Figure 2 therefore allows no direct pressure equalization with the ambient air, but only with the air space 210, which is present in the tank, and which is separated from the environment by the tank cover.
  • the embodiment shown in FIG. 2 therefore preferably comprises a pressure compensation mechanism between the air space 210 and the surroundings.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

La présente invention concerne une conduite pour fluide (202) destinée à un réservoir d'agent de réduction (200) d'un système d'élimination des oxydes d'azote. Cette conduite pour fluide comprend un élément de chauffage de ventilation (220) qui s'étend au moins le long d'une section longitudinale de la conduite pour fluide et qui est conçu pour chauffer la conduite pour fluide.
PCT/EP2007/062438 2006-12-28 2007-11-16 Élément de chauffage de ventilation pour réservoir d'agent de réduction WO2008080694A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07822658A EP2108076A1 (fr) 2006-12-28 2007-11-16 Élément de chauffage de ventilation pour réservoir d'agent de réduction

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006061735.5 2006-12-28
DE102006061735A DE102006061735A1 (de) 2006-12-28 2006-12-28 Belüftungsheizung für Reduktionsmitteltank

Publications (1)

Publication Number Publication Date
WO2008080694A1 true WO2008080694A1 (fr) 2008-07-10

Family

ID=38983281

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2007/062438 WO2008080694A1 (fr) 2006-12-28 2007-11-16 Élément de chauffage de ventilation pour réservoir d'agent de réduction

Country Status (3)

Country Link
EP (1) EP2108076A1 (fr)
DE (1) DE102006061735A1 (fr)
WO (1) WO2008080694A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011124770A1 (fr) 2010-04-06 2011-10-13 Mgi Coutier Réservoir de fluide avec système de mise à l'air
US20120315196A1 (en) * 2010-01-13 2012-12-13 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Apparatus having a tank and a delivery unit for reducing agent

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008031647A1 (de) * 2008-07-04 2010-02-04 Continental Automotive Gmbh Füllstandssensor und System mit einem Füllstandssensor und einem Fluidreservoir
EP2161421B2 (fr) * 2008-09-03 2017-08-09 Delphi International Operations Luxembourg S.à r.l. Appareil de stockage de réducteur NOx sur un véhicule
DE102008048798A1 (de) * 2008-09-24 2010-03-25 Emitec Gesellschaft Für Emissionstechnologie Mbh Tank für ein Reduktionsmittel mit Heizeinrichtungen
DE102009015124A1 (de) * 2009-03-31 2010-10-07 Continental Automotive Gmbh Entnahmeeinrichtung für eine wässrige Flüssigkeit in einem Kraftfahrzeug
DE102009047637A1 (de) * 2009-12-08 2011-06-09 Robert Bosch Gmbh Entlüftungselement für Vorratstank
DE102010010528A1 (de) * 2010-03-05 2011-09-08 Emitec Gesellschaft Für Emissionstechnologie Mbh Vorrichtung zur Bereitstellung eines flüssigen Reduktionsmittels
FR3004217B1 (fr) * 2013-04-09 2015-04-24 Peugeot Citroen Automobiles Sa Reservoir de stockage de liquide d'un vehicule
DE202013010565U1 (de) * 2013-11-22 2014-11-24 Seuffer gmbH & Co. KG Tankmodul für einen Flüssigkeitstank
DE102015218457A1 (de) 2015-09-25 2017-03-30 Robert Bosch Gmbh Heizeinrichtung für einen Flüssigkeitsbehälter
FR3061256B1 (fr) 2016-12-26 2019-09-27 Plastic Omnium Advanced Innovation And Research Compensateur de pression dans une bulle de liquide emprisonnee dans la glace.
DE102018214157A1 (de) 2018-08-22 2020-02-27 Robert Bosch Gmbh Tankanordnung

Citations (4)

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DE202006010615U1 (de) * 2005-09-26 2006-10-26 Dbk David + Baader Gmbh Tanksystem mit einem Haupttank und einer Abschmelzvorrichtung mit Schmelztank
DE102005025724A1 (de) * 2005-06-04 2006-12-07 Eichenauer Heizelemente Gmbh & Co. Kg Harnstoffversorgungssystem für einen Abgasreinigungskatalysator und hierfür geeigneter Heizeinsatz
WO2006131201A2 (fr) * 2005-06-04 2006-12-14 Eichenauer Heizelemente Gmbh & Co.Kg Systeme d'apport d'uree pour catalyseur de purification de gaz d'echappement, et element chauffant approprie
WO2006136306A1 (fr) * 2005-06-22 2006-12-28 Eichenauer Heizelemente Gmbh & Co. Kg Systeme d'alimentation en agent de reduction destine a un catalyseur d'epuration des gaz d'echappement et dispositif de chauffage correspondant

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005025724A1 (de) * 2005-06-04 2006-12-07 Eichenauer Heizelemente Gmbh & Co. Kg Harnstoffversorgungssystem für einen Abgasreinigungskatalysator und hierfür geeigneter Heizeinsatz
WO2006131201A2 (fr) * 2005-06-04 2006-12-14 Eichenauer Heizelemente Gmbh & Co.Kg Systeme d'apport d'uree pour catalyseur de purification de gaz d'echappement, et element chauffant approprie
WO2006136306A1 (fr) * 2005-06-22 2006-12-28 Eichenauer Heizelemente Gmbh & Co. Kg Systeme d'alimentation en agent de reduction destine a un catalyseur d'epuration des gaz d'echappement et dispositif de chauffage correspondant
DE202006010615U1 (de) * 2005-09-26 2006-10-26 Dbk David + Baader Gmbh Tanksystem mit einem Haupttank und einer Abschmelzvorrichtung mit Schmelztank

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120315196A1 (en) * 2010-01-13 2012-12-13 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Apparatus having a tank and a delivery unit for reducing agent
US10041392B2 (en) * 2010-01-13 2018-08-07 Emitec Gesellschaft Fuer Emissionstechnologie Mbh Apparatus having a tank and a delivery unit for reducing agent
WO2011124770A1 (fr) 2010-04-06 2011-10-13 Mgi Coutier Réservoir de fluide avec système de mise à l'air

Also Published As

Publication number Publication date
EP2108076A1 (fr) 2009-10-14
DE102006061735A1 (de) 2008-07-03

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