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WO2008106977A1 - Système et procédé de dosage de fluide - Google Patents

Système et procédé de dosage de fluide Download PDF

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Publication number
WO2008106977A1
WO2008106977A1 PCT/DK2008/050045 DK2008050045W WO2008106977A1 WO 2008106977 A1 WO2008106977 A1 WO 2008106977A1 DK 2008050045 W DK2008050045 W DK 2008050045W WO 2008106977 A1 WO2008106977 A1 WO 2008106977A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
channel part
dosing system
outlet
period
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.)
Ceased
Application number
PCT/DK2008/050045
Other languages
English (en)
Inventor
Niels Torp Madsen
Peter Rosenbeck Mortensen
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.)
Emitec Denmark AS
Original Assignee
Grundfos Nonox AS
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 Grundfos Nonox AS filed Critical Grundfos Nonox AS
Publication of WO2008106977A1 publication Critical patent/WO2008106977A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • 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 by exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
    • 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

  • the present invention relates to a system and method for dosing fluid.
  • the system comprises a fluid guide for guiding fluid from a feeding device, typically being a pump, and to a delivery position typically being an exhaust system of a combustion engine.
  • urea derivatives in piping and nozzle systems used for atomizing and introducing the so atomised urea into the exhaust system of a combustion engine.
  • the urea is dissolved in a fluid (water) and deposits are typically formed based on urea and/or urea derivatives.
  • the deposits are often formed on surfaces of the piping and/or nozzle, and as these deposits growth in size they start to block fluid passages resulting in a still poorer atomization and control of the delivered amount. Eventually the passages are totally blocked and the passages must be cleaned in some way which typically requires dismantling and manually removal of the deposits.
  • dry urea must be present (the water has to evaporate) • dry such as dewatered urea has to reach temperatures above 175°C without water present the flow passages of the piping and/or nozzle must be non-smooth in order to make an attachment point for the deposits presence of cavities, dead ends or re-circulating flow regions; e.g. regions where in-flowing or over-flowing fluid does not come directly into contact with the surface of the regions, such as flow over a rectangular cavity.
  • the fluid is preferably a urea in water solution (liquefied urea), typical 32,5% urea in demineralised water, Adblue (DIN 70070 / AUS32) or denoxium.
  • liquefied urea typical 32,5% urea in demineralised water
  • Adblue DIN 70070 / AUS32
  • denoxium denoxium
  • the invention relates in a first aspect to a dosing system for dosing a first fluid into a stream of a second fluid, the system preferably comprising, a fluid guide and a fluid feeding device, wherein the fluid guide comprises a channel part having an inlet arranged to receive the first fluid from the fluid feeding device and an outlet arranged to deliver the first fluid to the second fluid, and wherein - the channel part and the outlet are shaped and arranged so that heat conducted from the second fluid may evaporate first fluid present in the channel part and generate an interface between a gas phase located downstream of a liquid phase, said interface being sufficiently stable to keep the generated gas phase distinct from a liquid phase of the first fluid when no first fluid is fed to the inlet.
  • deposits may in some situations be formed in the gas containing region. However, such deposits are removed automatically e.g. by being dissolved or eroded by liquid flowing into the gas containing region when liquid is fed into the channel part. Thus, while many of the known systems seek to avoid formation of deposits, the present invention may be viewed as accepting such formations and flushing them away.
  • gas inclusions such as small air bubbles
  • Such gas inclusions in the piping may result from liquid evaporating locally or be introduced when liquid is fed to the channel part.
  • These gas inclusions act as damping means in the channel part resulting in a slow response in the outlet of the piping to e.g. a rapid increase in pressure at the inlet of the piping.
  • the present invention has also shown to have the potential to overcome problems related to such gas inclusions.
  • gas inclusions will have a tendency to fill up an entire cross section of e.g. the channel part (and thus not only at one side of the channel part) whereby the flow through the channel part will have a tendency to push such gas inclusions out of the channel part and the outlet. Furthermore, as it is aimed at avoiding or minimising cavities, dead end and re-circulating flow regions, gas inclusions in such regions will be minimised accordingly.
  • the channel part of a dosing system according to the present invention may comprise only one outlet, the only one outlet being the one arranged to deliver the first fluid to the second fluid, so that fluid flowing into the channel part may only leave the channel part through its outlet.
  • the channel part may be shaped so that no cavities, dead ends or re-circulating flow regions are present.
  • a dosing system may further comprise a strainer arranged upstream of the outlet or at the inlet of the channel part. Such a strainer can be used to prevent impurities, such as particles, present in the feeding device from entering the nozzle.
  • the outlet further comprises an atomization device.
  • the atomization device may comprise at least two converging nozzle channels.
  • the at least two converging channels may be formed in a circular disc attached to the downstream end of the channel part.
  • Such a device may be used to atomize the liquefied urea by letting fluid jets from the converging channels impinge each other.
  • the circular or oval disc may be an end of a tubular member, the tubular member being adapted to receive a downstream end region of the channel part.
  • the parts may be held together e.g. by welding, press-fitting, gluing, or mechanical fastening means. Other appropriate ways of assembling the channel part and the atomization device will be well-known to a person skilled in the art.
  • the channel part may have an external circular cross section with an external diameter being larger than or equal to 2 mm.
  • the longitudinal extension of the channel part may be shorter than 10 m, such as shorter than 5 m, preferably shorter than 2 m, or even shorter than 0.2 m.
  • the surface roughness on the surface of the channel part (1) measured by Rz may be smaller than,
  • the surface roughness should preferably be so small that deposits are not easily formed on the surfaces.
  • the channel part may be made from stainless steel, aluminium or plastic.
  • other types of materials may be more appropriate, e.g. to prevent disadvantageous chemical reactions with the material.
  • the atomization device may be made from stainless steel or ceramics.
  • Preferred embodiments of the invention further comprise a reservoir for storing the first fluid, the reservoir being in fluid communication with the fluid feeding device, preferably by a tube made from stainless steel, aluminium, or plastic.
  • the present invention relates to an exhaust system comprising a dosing system according to the first aspect and an exhaust pipe through which the second fluid flows, the outlet of the fluid guide being arranged so as to feed the first fluid into the second fluid.
  • the outlet may be arranged flush with or protruding the interior surface of the exhaust pipe.
  • the outlet may protrude the interior wall to an extent being smaller than half the diameter of the exhaust pipe through which the second fluid flows, and preferably smaller than 1.5 times the external diameter of the channel part.
  • a downstream region of the channel part may be arranged in the wall of the exhaust pipe in such a manner that thermal contact between said region of the channel part and the wall of the exhaust pipe surrounding the channel part is established.
  • a downstream region of the channel part may be arranged in the wall of the exhaust pipe in such a manner that the said region is thermally isolated from the wall of the exhaust pipe.
  • heating of the nozzle is limited and the thermal decomposition of the first fluid inside the nozzle is reduced.
  • the present invention relates to a method utilising a dosing system according to the first aspect of the present invention or an exhaust system according to second aspect of the present invention.
  • the method preferably comprises feeding first liquid into the channel part through its inlet during a first period at a first flow rate, and feeding first liquid into the channel part through its inlet during a succeeding second period at a second flow rate or not feeding first liquid into the channel part through its inlet during a succeeding second period, wherein - the duration of the second period is not sufficiently short or the second flow rate, if different from zero, is not sufficiently high to prevent evaporation of first fluid out of the outlet during the second period, said evaporation taking place in regions of the channel part (1) located in or in the vicinity of the second fluid.
  • the first flow rate may be greater than the second flow rate, and the second flow rate may be zero.
  • the first and/or the second flow rate may be constant during the first and/or second period respectively. Alternatively it may vary during a first and/or a second period.
  • the duration of a first period may be between 0.1 and 1 second, and the duration of a second period may be between 0.1 and 1 second.
  • Fig. 1 shows a cross sectional view of a fluid guide integrated in an exhaust pipe according to the present invention
  • Fig. 2 shows the temperature conditions in the channel part
  • Fig. 3 shows a dosing system according to the present invention
  • Fig. 4 shows a cross sectional view of an atomization device attached to a channel part according to the present invention
  • Fig. 5 shows seven embodiments of arrangements according to the present invention of the fluid guide in an exhaust pipe.
  • the fluid guide which guides fluid from a feeding device to an exhaust gas comprises a channel part 1 having at its inlet a strainer 2 and at its outlet an atomization device 3.
  • the outlet of the fluid guide and the atomization device 3 are arranged in a wall of pipe 5 leading exhaust gasses from a combustion engine to a catalyst.
  • the atomization device 3 is arranged so that it is flush with or protrudes slightly the interior surface of the pipe 5. It should be noted that fig. 1 is not executed to scale; the longitudinal extension of the channel part 1 is typically many times larger than the diameter of the channel part 1.
  • the downstream region of the channel part 1 is, as indicated in fig. 1, arranged in the wall 5 of the exhaust pipe in such a manner that thermal contact between said region of the channel part 1 and the wall 5 of the exhaust pipe surrounding the channel part 1 is established.
  • This may be provided in a number of ways, for instance by shaping the channel part 1 and the hole in the exhaust pipe so that the channel part 1 is press-fitted into the wall of the exhaust pipe, the channel part is welded, soldered, glued, or the like to the wall.
  • the arrangement of the channel part 1 in the wall 5 of the exhaust system is preferably so that if the respective surfaces do not abut each other, the thermal conductivity between the channel part 1 and the wall 5 of the exhaust pipe is similar to, such as equal to, or higher than the thermal conductive of the wall 5 or the channel part 1.
  • the channel part 1 is thermally isolated from the wall 5 of the exhaust pipe. Such isolation is typically established by manufacturing the flange for receiving the channel part in a material having a low conductivity, such as plastic.
  • the channel part 1 is shaped with a constant circular cross section so that no cavities are present in the channel part 1. Furthermore, the interior surface of the channels part has a roughness of smaller than ⁇ RZ25
  • the channel part 1 in the embodiment of fig. 1 is disclosed as having a constant cross sectional area throughout its longitudinal extension, the cross sectional area may decrease or increase in the direction towards the atomization device 3. Furthermore, the cross section may deviate from circular and may be e.g. elliptic. However, a cross section with corners, such as a square-shaped is typically less attractive as it may produce re-circulating flow or areas with no flow in or at the vicinity of such corners.
  • the internal diameter of the channel part 1 is smaller than 4.0 mm, such as smaller than 2.8 mm, preferably smaller than 2.2 mm, such as smaller than 1.3mm.
  • the atomization device 3 is also shaped so that substantially no cavities, dead ends or re-circulating flow regions are present. In accordance with the embodiment shown in fig. 1 this is accomplished by forming the atomization device 3 with two converging nozzle channels 4a, 4b each extending from the interior surface Ia of the channel part 1 and to the outer surface 3a of the atomization device 3. However, the region between the inlets of the two nozzle channels 4a, 4b facing upstream the channel part 1 may be exposed to deposits. If deposits occur in this region, they will not influence the flow as the region is small compared to the diameter of the channel part.
  • the fluid guide may in many situations work with no atomization device 3 provided, and the outlet of the fluid guide is thereby provided by the end of the channel part 1.
  • a typical scenario where no atomization device is provided is where the internal diameter of the channel part 1 is so small and the flow into which the urea (or in general the liquid) is introduced has sufficient momentum to disperse the jet emerged from the end of the channel part 1.
  • the fluid guide may be equipped with other types of atomization devices than the one shown in fig. 1.
  • a venturi-shaped outlet may be applied to the end of the channel part 1 to provide atomization, or the outlet may be shaped as a hollow cone, full cone, flat fan, solid stream atomizer, or the like.
  • the fluid guide comprises a strainer 2 at its inlet.
  • This strainer 2 filters particulates from the fluid flowing into the channel part 1, which particulates have a size which could block the nozzle channels 4a, 4b if not filtered off.
  • the strainer may be considered as a cavity as the cross section of it may be larger than the internal diameter of the channel part 1 in order to allow a demanded flow through it without giving rise to a large pressure drop.
  • the temperature of the strainer should be kept below 175°C to avoid creation of deposits, such as urea derivatives. Accordingly, the strainer is arranged sufficiently distant from the exhaust system and other heat source in order to avoid heating of the strainer.
  • the demands for urea will typically vary to a large extent.
  • feeding of urea through the fluid guide is typically done with pulse width modulation typically so that the flow through the fluid guide stops completely at some instants in time.
  • heat from the hot exhaust gasses will start to evaporate fluid present in the vicinity of the atomization device 3. Thereby a liquid-gas interface 6 will be created above which the fluid is a liquid and below which the fluid is a gas.
  • the size of the cross section of the channel part 1 is selected so that the surface 5 tension of the fluid-gas interface will be sufficient to keep the liquid-gas interface 6 stable at least when the interface is orientated facing in the direction of the gravity.
  • the cross section of the fluid guide is selected so that the fluid-gas interface 6 is stable irrespectively of its orientation relative to the gravity.
  • the internal diameter of the tube used for the channel part is 10 typically below 4.0 mm, such as smaller than 2.8 mm, preferably smaller than 2.2 mm, such as smaller than 1.3 mm. Such diameters make it possible for the surface tension of liquid, e.g. liquefied urea, to "block" the tube, and thereby make a sharp distinction between dry and wet side in the tube.
  • a gas comprising urea may have a tendency to create deposits in the form of urea crystals or urea derivatives on interior surfaces of the downstream end of the channel part 1 and on the surface of the atomization device 3 facing upstream. However, such deposits are removed either as the temperature in the regions of the deposits reaches the decomposition temperature
  • the sharp distinction between liquid and gas by the liquid- 25 gas interface 6 represents a sharp change in temperature.
  • the temperature in the liquid above the interface 6 will be below or at the boiling temperature of the liquid, which means that for urea the temperature of the liquid will not exceed the boiling point of 103 0 C.
  • formations of the urea and/or urea derivative, such as cyanuric acid, ammeline and ammelide, as deposits requires a temperature of 30 175°C or above, formation of such deposits will be unlikely in the liquid.
  • the fluid guide is shown in connection with a urea feeding device 7.
  • This urea feeding device 7 is adapted to feed urea into the fluid guide at a controllable rate typically in a pulse width modulated manner and may be constituted by a metering pump (not shown) or a similar pumping device.
  • the urea feeding device 7 delivers the fluid to the channel part 1 through the strainer 2 arranged at the inlet of the channel part 1.
  • the strainer may be arranged in another location e.g. before the pump as long as it is ensured that impurities are filtered off.
  • the channel part 1 with the feeding device 7 connected to its inlet has typically no fluid connection to the ambience upstream of liquid-gas interface 6 whereby this fluid tight system will further stabilise the liquid-gas interface 6.
  • the fluid tightness is preferably provided by a valve (not shown) located upstream of the channel part 1, and preferably in the feeding device 7 where the fluid tightness is provided by e.g. a pump (not shown) of the feeding device 7.
  • the feeding device 7 is typically connected to a reservoir (not shown) storing the water solution of urea so that the feeding device 7 receives urea from this reservoir.
  • the connection between the reservoir and the feeding device 7 is typically also designed so as to avoid deposits in a manner similar to the fluid guide.
  • the connection is typically a tube made of plastic, stainless steel or aluminium.
  • the tube used for the channel part is made of material of sufficient strength and has a wall thickness of sufficient size to avoid expansion in radial direction of the channel part 1.
  • Such dimensioning of the channel part 1 is made in order to assure that a pressure increase of the fluid present in the tube, e.g. when a fluid pulse is feed into the tube, will not result in a substantial buffering of fluid in the fluid guide.
  • An acceptable buffer size is related to the time for creating sufficient atomization pressure. The time is preferably less than 25 ms.
  • Typical dimensions of the channel part are an internal diameter of below 4.0 mm, such as smaller than 2.8 mm, preferably smaller than 2.2 mm, such as smaller than 1.3 mm and a wall thickness of 1 mm.
  • the material of the channel pipe is preferably stainless steel, but may be other materials such of aluminium or plastic.
  • the strainer 2 and channel part 1 are connected to the urea feeding device 7 by a flange 8 as indicated in the close-up of fig 3.
  • the connection by the flange 8 may be detachable so that the strainer may be removed for cleaning or replacement if being clogged.
  • the fluid feeding device 7 is located at a distance from the point where the atomised urea is to be delivered (the location of the atomisation device 3).
  • the channel part 1 is guided uninterrupted, typically as a single piece, from the strainer 2 to the atomisation device 3.
  • a typical length of the channel part 1 is between 0.04 m and 10 m. It should be mentioned that although it is preferred to manufacture the channel part 1 as a one piece element, the channel part 1 may be assembled from various pieces. However, in such embodiments the flow passage between such various parts should be made sufficiently smooth and should not contain cavities, dead ends or re-circulating flow regions which could result in formation of deposits.
  • the atomization device 3 is typical made from a circular disc, round or oval, with nozzle channels 4a, 4b which are attached to the end of the channel 1 by soldering, welding, gluing, or press- fitting.
  • the atomization device may alternatively be made as shown in fig. 4.
  • the atomization device 3 is made as a tubular part which closely fits the exterior of the channel part 1.
  • the atomization device 3 and/or channel part 1 may be provided as a spare part whereby a damaged atomization device 3 may easily be replaced.
  • the atomization device 3 is typically made of stainless steel, but may be made from other materials, such as ceramics.
  • the end of the channel is chamfered and the disc with nozzle channels 4a 4b is consequently oval (it is assumed that the channel part has a circular cross section which need not to be the case).
  • the fluid being present in the channel part 1 in the vicinity of the exhaust pipe 5 will boil and evaporate out of the nozzle channels 4a and 4b, and the interface 6 will be created and travel upstream in the channel part 1 as shown in fig. 2.
  • the duration of the pulse where liquid is fed to the channels part 1 is preferably selected so that the volume of the channel part 1 filled with gas is filled with liquid during a pulse.
  • the pulse width and flow rate may not be sufficient to fill the volume filled with gas.
  • this is not considered as being a problem as the heat will evaporate liquefied urea in the channel part 1 resulting in a flow of urea out of the nozzle channels 4a and 4b.
  • Amplitude modulation may provide the same or similar effects as the flow rate through the channel part 1 may be insufficient to avoid evaporation of liquid and generation of the interface 6 during some periods. Later, however, the flow rate will be sufficient to fill the channel part 1.
  • Fig. 5 shows seven embodiments according to the present invention pertaining to arranging a fluid guide in an exhaust system.
  • the figure discloses that the channel part 1 with atomization device 3 may be arranged in a flange 9 used for attaching the channel part 1 with atomization device 3 to the wall of the exhaust pipe 5.
  • the figures show that the orientation of the spray in the exhaust pipe 5 is controllable by the orientation of the atomization device relative to the wall of the pipe 5 as shown in the examples of fig. 5.
  • the fluid guide may be arranged in a bend of the pipe 5. It should be noted that although fig. 5 shows different embodiments, two or more of these embodiments may be used together.

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  • 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 porte sur un système de dosage permettant de doser un premier fluide dans un courant d'un second fluide, le système comprenant un guide de fluide et un dispositif d'alimentation en fluide (7). Le guide de fluide comprend une partie de canal (1) ayant un orifice d'entrée disposé pour recevoir le premier fluide du dispositif d'alimentation en fluide (7) et un orifice de sortie disposé pour distribuer le premier fluide au second fluide. En outre, la partie de canal (1) et l'orifice de sortie sont dimensionnés et disposés de telle sorte que la chaleur dégagée du second fluide peut faire évaporer le premier fluide présent dans la partie de canal (1) et générer une interface entre une phase gazeuse située en aval d'une phase liquide, ladite interface étant suffisamment stable pour conserver la phase gazeuse générée distincte d'une phase liquide du premier fluide lorsque le premier fluide n'est pas transmis à l'orifice d'entrée. L'invention porte en outre sur un système d'échappement comprenant un tel système de dosage et sur un procédé utilisant un tel système de dosage ou un tel système d'échappement.
PCT/DK2008/050045 2007-03-02 2008-02-26 Système et procédé de dosage de fluide Ceased WO2008106977A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200700320 2007-03-02
DKPA200700320 2007-03-02

Publications (1)

Publication Number Publication Date
WO2008106977A1 true WO2008106977A1 (fr) 2008-09-12

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4230054A1 (de) * 1991-06-28 1994-03-10 Man Nutzfahrzeuge Ag Zerstäuberdüse
DE19946901A1 (de) * 1999-09-30 2001-04-05 Bosch Gmbh Robert Vorrichtung zur Beaufschlagung eines strömenden Gases mit einem Reaktionsmittel
WO2004035188A1 (fr) * 2002-10-14 2004-04-29 Robert Bosch Gmbh Dispositif d'atomisation
EP1669566A1 (fr) * 2003-09-19 2006-06-14 Nissan Diesel Motor Co., Ltd. Dispositif de purification des gaz d'echappement d'un moteur
WO2006075029A1 (fr) * 2005-01-17 2006-07-20 Robert Bosch Gmbh Dispositif de post-traitement de gaz d'echappement
DE102005019347A1 (de) * 2005-04-26 2006-11-02 Daimlerchrysler Ag Abgabevorrichtung sowie Verfahren zur Einbringung von Reduktionsmittel in ein Abgas einer Brennkraftmaschine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4230054A1 (de) * 1991-06-28 1994-03-10 Man Nutzfahrzeuge Ag Zerstäuberdüse
DE19946901A1 (de) * 1999-09-30 2001-04-05 Bosch Gmbh Robert Vorrichtung zur Beaufschlagung eines strömenden Gases mit einem Reaktionsmittel
WO2004035188A1 (fr) * 2002-10-14 2004-04-29 Robert Bosch Gmbh Dispositif d'atomisation
EP1669566A1 (fr) * 2003-09-19 2006-06-14 Nissan Diesel Motor Co., Ltd. Dispositif de purification des gaz d'echappement d'un moteur
WO2006075029A1 (fr) * 2005-01-17 2006-07-20 Robert Bosch Gmbh Dispositif de post-traitement de gaz d'echappement
DE102005019347A1 (de) * 2005-04-26 2006-11-02 Daimlerchrysler Ag Abgabevorrichtung sowie Verfahren zur Einbringung von Reduktionsmittel in ein Abgas einer Brennkraftmaschine

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