EP2108076A1 - Ventilation heater for reducing agent tank - Google Patents

Ventilation heater for reducing agent tank

Info

Publication number
EP2108076A1
EP2108076A1 EP07822658A EP07822658A EP2108076A1 EP 2108076 A1 EP2108076 A1 EP 2108076A1 EP 07822658 A EP07822658 A EP 07822658A EP 07822658 A EP07822658 A EP 07822658A EP 2108076 A1 EP2108076 A1 EP 2108076A1
Authority
EP
European Patent Office
Prior art keywords
fluid line
tank
reducing agent
heater
line
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Withdrawn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
EP07822658A
Other languages
German (de)
French (fr)
Inventor
Rainer Haeberer
Matthias Horn
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.)
Robert Bosch GmbH
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
Publication of EP2108076A1 publication Critical patent/EP2108076A1/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Withdrawn legal-status Critical Current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
    • F01N3/08—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

The invention relates to a fluid line (202) for a reducing agent tank (200) of a system for removing nitrogen oxides, said fluid line comprising a ventilation heater (220) which extends at least along one longitudinal section of the fluid line and is designed to heat said line.

Description

Beschreibung description
Titeltitle
Belüftungsheizung für ReduktionsmitteltankVentilation heater for reducing agent tank
Stand der TechnikState of the art
Zur Entfernung von Stickoxiden im Abgasstrom von Verbrennungsmotoren wird ein Reduktionsmittel in den Abgasstrom eingespritzt, um die Stickoxide mittels eines Katalysators in elementaren Stickstoff und Wasser umzuwandeln. Hierzu wird flüssiges Redukti- onsmittel verwendet, in dem die aktive Substanz, beispielsweise Harnstoff, in Wasser gelöst ist. Das Reduktionsmittel wird in einem Tank gelagert, aus dem es mit einer Förderpumpe entnommen wird.To remove nitrogen oxides in the exhaust stream of internal combustion engines, a reducing agent is injected into the exhaust stream to convert the nitrogen oxides by means of a catalyst into elemental nitrogen and water. For this purpose, 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.
Um das Einfrieren des flüssigen Reduktionsmittels zu verhindern, wird Anti- Frostschutzmittel zugesetzt, so dass übliche flüssige Reduktionsmittel zwischen -11 C° und -40 C° gefrieren. Da auch bei tiefen Temperaturen die Stickoxide reduziert werden müssen, muss das Reduktionsmittel zunächst aufgetaut werden. Dazu ist am Tankboden eine Heizung angebracht, die das gefrorene Reduktionsmittel auftaut. Das Mittel wird zunächst in dem heizungsnahen Bereich verflüssigt, wobei dieses aufgetaute Reduktions- mittel noch von einer dicken Eishülle umgeben ist. Das Absaugen des so eingeschlossenen flüssigen Reduktionsmittels würde zu einem Vakuum führen, so dass mit der Förderung des Reduktionsmittels erst begonnen wird, wenn die Heizung den Grossteil der gefrorenen Masse und die Eisdecke aufgetaut hat. Daher wird der Betriebsstart des Entsti- ckungssystems deutlich verzögert.In order to prevent the freezing of the liquid reducing agent, 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. For this purpose, 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.
Vorteile der ErfindungAdvantages of the invention
Mit der vorliegenden Erfindung ist es möglich, auch bei anfangs gefrorenem Tankinhalt das Entstickungssystem nach sehr kurzer Zeit zu starten. Erfindungsgemäß kann mit der Förderung des Reduktionsmittels begonnen werden, sobald sich eine ausreichende Menge an Reduktionsmittel gesammelt hat, wobei eine noch geschlossene Eisdecke und somit der hermetische Einschluss des flüssigen Reduktionsmittels den Betrieb des Systems nicht behindert. Erfindungsgemäß wird zusätzlich zur Tankheizung eine Belüftungsheizung vorgesehen, die so angeordnet ist, dass durch den Eispanzer hindurch ein Druck- ausgleich stattfinden kann. Mithilfe der Erfindung ist es möglich, einen entsprechenden Kanal vorzusehen, der zur Belüftung dient und somit die Volumenverminderung durch das geförderte flüssige Reduktionsmittel ausgleicht. Auf diese Weise ist es nicht erforderlich, mit dem Start des Entstickungssystems zu warten, bis die Tankheizung das Reduktions- mittel soweit aufgetaut hat, dass die Eisdecke eine Lücke aufweist, durch die ein Druckausgleich stattfinden kann.With the present invention, it is possible to start the Entstickungssystem after a very short time even at the beginning of frozen tank contents. According to the invention can be started with the promotion of the reducing agent as soon as a sufficient amount of reducing agent has collected, with a still closed ice cover and thus the hermetic inclusion of the liquid reducing agent does not hinder the operation of the system. According to the invention, 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. By means of the invention it is possible to provide 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.
Kurze Beschreibung der ZeichnungenBrief description of the drawings
Anhand der Zeichnungen wird die Erfindung nachstehend erläutert.With reference to the drawings, the invention will be explained below.
Es zeigen:Show it:
Figur 1 eine Schnittansicht eines Tanks gemäß dem Stand der Technik.Figure 1 is a sectional view of a tank according to the prior art.
Figur 2 eine Schnittansicht eines Reduktionsmitteltanks, der mit einer beheiztenFigure 2 is a sectional view of a reducing agent tank, with a heated
Fluidleitung vorgesehen ist, die gemäß eines ersten Aspekts der vorliegenden Erfindung ausgeführt ist.Fluid line is provided, which is carried out according to a first aspect of the present invention.
Figur 3 eine Schnittansicht eines Reduktionsmitteltanks, der mit einer beheizbarenFigure 3 is a sectional view of a reducing agent tank, with a heated
Fluidleitung vorgesehen ist, die gemäß eines zweiten Aspekts der Erfindung ausgeführt ist.Fluid line is provided, which is designed according to a second aspect of the invention.
Die Figur 1 zeigt einen Querschnitt durch einen Reduktionsmitteltank nach dem Stand der Technik. Der Reduktionsmitteltank 100 umfasst eine Förderleitung 102 zum Fördern des im Tank befindlichen Reduktionsmittels 106, 108. Das Volumen von bereits gefördertem Reduktionsmittel wird von Luft 110 eingenommen. Am Boden des Tanks 100 ist eine Heizung 104 vorgesehen, die gefrorenes Reduktionsmittel 108 in flüssiges Reduktionsmittel 106 umwandelt, welches dann gefördert werden kann. Liegt jedoch die oberste Stelle 114 der Grenzfläche zwischen flüssigem 106 und festem 108 Reduktionsmittel unter der Eisoberfläche, dann ist das flüssige Reduktionsmittel 106 eingeschlossen. In diesem Fall kann auf Grund der Vakuumwirkung des Eispanzers 108 kein flüssiges Reduktionsmittel entnommen werden, obwohl es vorliegt. Bei stetiger Wärmezufuhr steigt auf Grund von Konvektionsbewegungen die oberste Stelle der 114 der Grenzfläche zwischen flüssigem und festem Reduktionsmittel weiter nach oben und erreicht die Eisoberfläche. Erst ab dann kann das flüssige Reduktionsmittel 106 gefördert werden, wobei das innere des Eispanzers 108 über die freie Stelle 114' belüftet werden kann.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. At the bottom of the tank 100, there is provided a heater 104 which converts frozen reductant 108 into liquid reductant 106, which may then be conveyed. However, if the uppermost point 114 of the interface between liquid 106 and solid 108 reducing agent is below the ice surface, then 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. With constant heat supply due to convective movements, the uppermost point 114 of the interface between liquid and solid reducing agent continues to rise and reaches the ice surface. Only then can the liquid reducing agent 106 be conveyed, wherein the interior of the ice sheet 108 can be aerated via the free point 114 '.
Ausführungsform Gemäß einer ersten Ausführung der Erfindung wird eine Fluidleitung für einen Reduktionsmitteltank vorgesehen, die mittels einer Belüftungsheizung beheizt werden kann. Die Fluidleitung ist dafür vorgesehen, das von der Tankheizung 204 verflüssigte Reduktions- mittel zu fördern. Gleichzeitig trägt die erfindungsgemäße Fluidleitung 202 eine Belüftungsheizung 220, die sich entlang der Fluidleitung 202 erstreckt. Wird die Belüftungsheizung aktiviert, so wird ein durchgehender, sich zur Fluidleitung längs erstreckender Bereich des gefrorenen Reduktionsmittels erwärmt und verflüssigt. Dieser Bereich bildet einen Kanal, durch den hindurch Luft strömen kann, die das Volumen ausgleicht, welches dem geförderten flüssigen Reduktionsmittel entspricht. Auf diese Weise bildet der geschlossene Eispanzer 208 keine hermetische Umschließung für das flüssige Reduktionsmittel 206, die auf Grund von Vakuumsog das Fördern des umschlossenen flüssigen Reduktionsmittels verhindert.embodiment According to a first embodiment of the invention, a fluid line for a reducing agent tank is provided, 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. At the same time, 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.
In einer bevorzugten Ausführung ist die Heizung durchgehend über einen Längsabschnitt der Förderleitung 202 vorgesehen, der zwischen dem flüssigen Reduktionsmittel 206 und der Eisdecke verläuft. Vorzugsweise erstreckt sich die Belüftungsheizung entlang einer Strecke, die eine Belüftung auch ermöglicht, wenn (direkt an der Tankheizung 204) nur wenig des Reduktionsmittels verflüssigt wurde und der Tank bis zur Decke des Tanks hin gefüllt ist. Gemäß einer bevorzugten Ausführung verläuft die Belüftungsheizung konzentrisch um die Fluidleitung und umgreift diese. Alternativ kann die Heizung entlang einer Außenseite der Fluidleitung verlaufen, beispielsweise in Form eines Stabs, der neben der Fluidleitung angeordnet ist. Vorteilhafterweise befindet sich das Saugende der Fluidleitung 202 in der Nähe der Heizung 204.In a preferred embodiment, 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. Preferably, 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. According to a preferred embodiment, the ventilation heater runs concentrically around the fluid line and surrounds it. Alternatively, 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. Advantageously, the suction end of the fluid line 202 is near the heater 204.
In einer bevorzugten Ausführungsform wird als Belüftungsheizung eine elektrische Heizeinrichtung verwendet. Vorzugsweise ist die elektrische Heizeinrichtung ein Draht, der um die Fluidleitung gewickelt ist, und so die Fluidleitung umfänglich umgreift. Statt Draht kann auch eine Heizfolie oder eine Heizschicht verwendet werden. Alternativ umfasst die Fluid- leitung eine Belüftungsheizung, die sich zu der Fluidleitung längs erstreckt, parallel neben diese angeordnet ist und mit dieser wärmeleitend verbunden ist, beispielsweise durch mechanischen Kontakt. In diesem Fall kann die Belüftungsheizung aus einem Träger bestehen, beispielsweise ein stabförmiges Rohr, welches über einen Heizdraht, eine Heizfolie oder eine Heizschicht verfügt. Eine besonders einfache Herstellung ergibt sich, wenn die Belüftungsheizung über eine Länge der Fluidleitung vorgesehen ist, die dem gesamten im Tank befindlichen Abschnitt der Fluidleitung entspricht. Alternativ erstreckt sich die Belüftungsheizung entlang der gesamten Fluidleitung. Erfindungsgemäß wird auch ein Reduktionsmitteltank vorgesehen, bei dem die mit der Belüftungsheizung ausgestattete Fluidleitung, wie oben beschrieben, eine Ansaugöffnung aufweist, die in der Nähe der Tankheizung angeordnet ist. Da in dem Bereich nahe der Tankheizung das Reduktionsmittel als Erstes schmilzt, erlaubt dies den Betrieb des Ent- stickungssystems bereits kurz nach Aktivierung der Tankheizung und der Belüftungsheizung.In a preferred embodiment, an electric heater is used as the ventilation heater. Preferably, the electric heater is a wire that is wound around the fluid line, and thus circumferentially surrounds the fluid line. Instead of wire, a heating foil or a heating layer can also be used. Alternatively, 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. In this case, 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. A particularly simple production results when the ventilation heating is provided over a length of the fluid line which corresponds to the entire section of the fluid line located in the tank. Alternatively, the ventilation heater extends along the entire fluid line. According to the invention, 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.
Die Belüftungsheizung kann einteilig mit der Fluidleitung ausgeführt sein, beispielsweise indem diese in die Wand der Fluidleitung eingebettet ist. Alternativ ist die Belüftungshei- zung rohrförmig und bildet eine innere Passage, in der die Fluidleitung angeordnet ist.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. Alternatively, the ventilation heater is tubular and forms an internal passage in which the fluid conduit is located.
In der in Figur 2 dargestellten Ausführung genügt die Verflüssigung einer durchgehenden dünnen Schicht 222 um die im Reduktionsmittel eingefrorene Fluidleitung herum, um den Druckausgleich des eingeschlossenen flüssigen Reduktionsmittels bei der Förderung zu ermöglichen. Mit der erfindungsgemäßen Belüftungsheizung kann eine solche Schicht in kürzester Zeit erzeugt werden.In the embodiment shown in Figure 2, 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. With the ventilation heating according to the invention, such a layer can be generated in a very short time.
Die Figur 3 zeigt einen Reduktionsmitteltank mit einer Fluidleitung, die gemäß eines zweiten Aspekts der Erfindung ausgebildet ist.FIG. 3 shows a reducing agent tank with a fluid line formed according to a second aspect of the invention.
Im Vergleich zu der in Figur 2 dargestellten Ausführung, in der die Belüftungsheizung ein Belüftungskanal um die Förderleitung herum ausbildet, ist in der Figur 3 dargestellten Ausführung eine Belüftungsleitung vorgesehen, die räumlich getrennt von der Förderleitung angeordnet ist.Compared to the embodiment shown in FIG. 2, in which the ventilation heating system forms a ventilation channel around the delivery line, a ventilation line is provided in the embodiment shown in FIG. 3, which is arranged spatially separated from the delivery line.
Die in Figur 3 dargestellte Ausführung umfasst somit gemäß eines zweiten Aspekts der Erfindung eine Fluidleitung 330, die als Belüftungsleitung dient. Die an dieser Belüftungsleitung 330 angeordnete Belüftungsheizung 332 dient zum Auftauen des Reduktionsmittels, das in der Belüftungsleitung vorliegt. Die Belüftungsleitung umfasst eine Belüftungs- Öffnung, die in dem Tankinneren in der Nähe der Tankheizung 304 angeordnet ist. Wird daher die Tankheizung 304 aktiviert, so wird flüssiges Reduktionsmittel in der Nähe der Heizung erzeugt, welches von gefrorenem Reduktionsmittel 308 umschlossen ist. Da die Belüftungsöffnung nahe der Tankheizung angeordnet ist und somit in Fluidkommunikation mit dem flüssigen Reduktionsmittel steht, kann über die Belüftungsleitung durch Einsau- gen von Umgebungsluft das Volumen des flüssigen Reduktionsmittels ausgeglichen werden, das gefördert wird. Ebenfalls in der Nähe der Tankheizung 304 ist eine Ansaugöffnung der Förderleitung 302 vorgesehen. Die Förderleitung tritt durch den Tankboden in das Innere des Tanks 300. Die Förderleitung 302 ist mit einer Förderheizung 320 ausges- tattet, die für die Verflüssigung des in der Förderleitung befindlichen Reduktionsmittels sorgt.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. Also in the vicinity of the tank heater 304, a suction port of the delivery line 302 is provided. 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.
Vorzugsweise ist die Belüftungsöffnung der Belüftungsleitung 330 entfernt von der An- Säugöffnung der Förderleitung 302 räumlich getrennt, um zu vermeiden, dass durch die Belüftung eintretende Luft von der Förderleitung 302 eingesogen wird.Preferably, the 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.
Die Belüftungsleitung 330, die mit der Belüftungsheizung 332 ausgebildet ist, mündet vorzugsweise in die Umgebung an einer Stelle, die oberhalb der Tankdecke liegt, um ein unerwünschtes Austreten des Reduktionsmittels zu vermeiden. Reduktionsmittel, das sich in der Belüftungsleitung befindet, wird durch die Schwerkraft am Austreten gehindert. Wie auch in der Figur 2 dargestellten Ausführung kann die Belüftungsheizung 332 die Belüftungsleitung 330 vollständig umgreifen oder neben dieser angeordnet sein, so dass gewährleistet ist, dass die Belüftungsleitung 330 über ihre gesamte Länge einen zusam- menhängenden Kanal erzeugen kann, durch den Luft fließen kann. Wie bereits bemerkt, kann die Belüftungsheizung 332 ein Draht sein, der um die Belüftungsleitung 330 herum gewickelt ist. Alternativ kann ein entsprechend in der Nähe angeordneter Heizstab verwendet werden. Als Heizelement kann ferner eine Heizfolie oder eine Heizschicht verwendet werden. Vorteilhafterweise wird die Wärme durch elektrischen Strom erzeugt.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. As in the embodiment shown in FIG. 2, 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. As already noted, the vent heater 332 may be a wire wrapped around the vent conduit 330. Alternatively, a correspondingly arranged nearby heating rod can be used. As a heating element, a heating foil or a heating layer may also be used. Advantageously, the heat is generated by electric current.
Durch Vergleich mit der Figur 2 kann in der Figur 3 erkannt werden, dass die Belüftungsleitung 330 eine Verbindung zwischen dem im Tank 300 eingeschlossenen flüssigen Reduktionsmittel 306 und der direkten Umgebung schafft, wohingegen die in Figur 2 dargestellte Ausführung einen Kanal zwischen dem Luftraum 210 innerhalb des Tanks 200 und dem eingeschlossenen flüssigen Reduktionsmittel 206 schafft. Die in Figur 2 dargestellte Ausführung erlaubt daher keinen direkten Druckausgleich mit der Umgebungsluft, sondern nur mit dem Luftraum 210, der im Tank vorliegt, und der durch die Tankdecke von der Umgebung getrennt ist. Vorzugsweise umfasst die in Figur 2 dargestellte Ausführung daher einen Druckausgleichsmechanismus zwischen dem Luftraum 210 und der Umge- bung.By comparison with FIG. 2, it can be seen in FIG. 3 that the venting line 330 creates a connection between the liquid reducing agent 306 enclosed in the tank 300 and the direct environment, whereas 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.
Die oben beschriebenen Ausführungen der Erfindung werden vorzugsweise in Tankanlagen von Denoxtronic-Systemen verwendet. The embodiments of the invention described above are preferably used in tank systems of Denoxtronic systems.

Claims

Ansprüche claims
1. Fluidleitung für einen Reduktionsmitteltank (200, 300) eines Entstickungssystems, dadurch gekennzeichnet, dass die Fluidleitung (202, 330) eine Belüftungsheizung (220, 332) umfasst, wobei sich die Belüftungsheizung (220, 332) zumindest entlang eines Längsabschnitts der Fluidleitung (202, 330) erstreckt und eingerichtet ist, die1. fluid line for a reducing agent tank (200, 300) of a denitrification system, characterized in that the fluid line (202, 330) comprises a ventilation heater (220, 332), wherein the ventilation heater (220, 332) at least along a longitudinal section of the fluid line ( 202, 330) extends and is set up, the
Fluidleitung (202, 330) zu erwärmen.Fluid line (202, 330) to heat.
2. Fluidleitung nach Anspruch 1, wobei die Fluidleitung (202, 330) eine Förderleitung (202, 302) für Reduktionsmittel umfasst, die zur Förderung von Reduktionsmittel aus dem Reduktionsmitteltank (200, 300) vorgesehen ist.2. The fluid line according to claim 1, wherein the fluid line (202, 330) comprises a delivery line (202, 302) for reducing agent, which is provided for the delivery of reducing agent from the reducing agent tank (200, 300).
3. Fluidleitung nach Anspruch 1, wobei die Fluidleitung (330) eine Belüftungsleitung (330) umfasst, wobei die Belüftungsleitung (330) eingerichtet und angeordnet ist, einen Druckunterschied zwischen dem Inneren (306) des Reduktionsmitteltanks (300) und der Umgebung auszugleichen.The fluid line of claim 1, wherein the fluid line (330) comprises a vent line (330), the vent line (330) being arranged and arranged to equalize a pressure differential between the interior (306) of the reductant tank (300) and the environment.
4. Fluidleitung nach Anspruch 1, wobei die Belüftungsheizung (220, 332) eine elektrische Heizeinrichtung umfasst, die zumindest über einen Längsabschnitt der Fluidleitung (202, 330) neben dieser verläuft oder zumindest über einen Längsabschnitt der Fluid- leitung (202, 330) diese umgreift.4. fluid line according to claim 1, wherein the ventilation heater (220, 332) comprises an electric heater which extends at least over a longitudinal portion of the fluid line (202, 330) adjacent to this or at least over a longitudinal section of the fluid line (202, 330) this embraces.
5. Fluidleitung (202, 330) nach Anspruch 4, wobei die elektrische Heizeinrichtung einen Heizdraht oder einer Heizfolie umfasst.5. fluid line (202, 330) according to claim 4, wherein the electric heater comprises a heating wire or a heating foil.
6. Fluidleitung (202, 330) nach Anspruch 1, wobei sich der Längsabschnitt über die gesamte Strecke der Fluidleitung (202, 330) erstreckt oder über die gesamte Strecke der Fluidleitung (202, 330) erstreckt, die in dem Reduktionsmitteltank (200, 300) liegt.6. fluid line (202, 330) according to claim 1, wherein the longitudinal portion over the entire length of the fluid line (202, 330) extends or extends over the entire distance of the fluid line (202, 330) in the reducing agent tank (200, 300 ) lies.
7. Reduktionsmitteltank (200) mit einer am Tankboden vorgesehenen Tankheizung (204) und einer Fluidleitung (202) nach Anspruch 2, wobei die Fluidleitung (202) eine7. reducing agent tank (200) having a provided on the tank bottom tank heater (204) and a fluid line (202) according to claim 2, wherein the fluid line (202) a
Ansaugöffnung aufweist, die in der Nähe der Tankheizung (204) angeordnet ist, durch das Innere des Tanks führt, und durch die Tankdecke nach außen tritt. Intake port, which is located near the tank heater (204), passes through the interior of the tank, and passes through the tank ceiling to the outside.
8. Reduktionsmitteltank (300) mit einer Fluidleitung (330) nach Anspruch 3, wobei die Fluidleitung (330) durch den Tankboden nach außen tritt und eine Belüftungsöffnung aufweist, die oberhalb der Tankdecke angeordnet ist.8. reducing agent tank (300) having a fluid line (330) according to claim 3, wherein the fluid line (330) passes through the tank bottom to the outside and having a ventilation opening, which is arranged above the tank ceiling.
9. Reduktionsmitteltank (300) nach Anspruch 8, wobei der Reduktionsmitteltank (300) ferner eine Förderleitung (302) für Reduktionsmittel (306) umfasst, die eine Ansaugöffnung aufweist, welche in der Nähe der Tankheizung (304) angeordnet ist. The reducing agent tank (300) according to claim 8, wherein the reducing agent tank (300) further comprises a reducing agent supply line (302) having a suction port disposed in the vicinity of the tank heater (304).
EP07822658A 2006-12-28 2007-11-16 Ventilation heater for reducing agent tank Withdrawn EP2108076A1 (en)

Applications Claiming Priority (2)

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DE102006061735A DE102006061735A1 (en) 2006-12-28 2006-12-28 Fluid line for reducing agent tank of denitrification system, has ventilation heater extending along longitudinal section of fluid line and equipped to heat fluid line, where conveyor line is provided for conveying reducing agent from tank
PCT/EP2007/062438 WO2008080694A1 (en) 2006-12-28 2007-11-16 Ventilation heater for reducing agent tank

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