WO2013079509A1 - Système de post-traitement des gaz d'échappement et procédé d'introduction d'un agent de réduction dans un canal pour gaz d'échappement d'un moteur à combustion interne - Google Patents

Système de post-traitement des gaz d'échappement et procédé d'introduction d'un agent de réduction dans un canal pour gaz d'échappement d'un moteur à combustion interne Download PDF

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Publication number
WO2013079509A1
WO2013079509A1 PCT/EP2012/073794 EP2012073794W WO2013079509A1 WO 2013079509 A1 WO2013079509 A1 WO 2013079509A1 EP 2012073794 W EP2012073794 W EP 2012073794W WO 2013079509 A1 WO2013079509 A1 WO 2013079509A1
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WO
WIPO (PCT)
Prior art keywords
mixing chamber
reducing agent
exhaust
metering pump
line
Prior art date
Application number
PCT/EP2012/073794
Other languages
German (de)
English (en)
Inventor
Rainer Gansel
Andreas Kerst
Ulrich Meingast
Godehard Nentwig
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 RU2014126214A priority Critical patent/RU2643277C1/ru
Priority to CN201280056397.5A priority patent/CN103946500A/zh
Publication of WO2013079509A1 publication Critical patent/WO2013079509A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—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
    • F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
    • 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
    • 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
    • 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

  • Exhaust gas aftertreatment system and method for introducing a reducing agent into an exhaust passage of an internal combustion engine Exhaust gas aftertreatment system and method for introducing a reducing agent into an exhaust passage of an internal combustion engine
  • the invention relates to an exhaust aftertreatment system and a method for introducing a reducing agent into an exhaust passage of an internal combustion engine according to the preamble of the independent claims.
  • exhaust aftertreatment systems for the aftertreatment of the exhaust gases of internal combustion engines, in particular for the aftertreatment of nitrogen oxides in the exhaust gas, exhaust aftertreatment systems are known in which a reducing agent, usually aqueous urea solution is metered into the exhaust duct of the internal combustion engine, wherein ammonia is formed from the aqueous urea solution by hydrolysis in the exhaust duct.
  • a reducing agent usually aqueous urea solution
  • ammonia is formed from the aqueous urea solution by hydrolysis in the exhaust duct.
  • the nitrogen oxides are converted by the ammonia to environmentally harmless substances such as nitrogen and water.
  • an exhaust aftertreatment system is known in which aqueous urea solution and compressed air are supplied via a pump to a mixing chamber, the urea solution is atomized by means of compressed air in the mixing chamber and the aerosol is metered into the exhaust passage by means of an injection valve.
  • the exhaust aftertreatment system according to the invention and the method for introducing a reducing agent into an exhaust passage of an internal combustion engine with the features of the independent claims have the advantage that the pump are designed as a metering pump, wherein the promotion and a demand-based metering of the reducing agent to the mixing chamber or to the exhaust passage through the Metering pump takes place.
  • the metering pump is valve-free connected via a reducing agent line to the exhaust passage of an internal combustion engine.
  • valve-free connection of the metering pump to the exhaust duct makes the system "ice-proof", which means that if reductant in the reductant line freezes, it is possible for this reductant to expand without damaging components of the exhaust aftertreatment system
  • the space between the mixing chamber and the metering pump does not expose it to the high thermal load through the exhaust gas duct, while the reducing agent may extend over the end of the reducing agent line in the direction of the mixing chamber or the exhaust gas duct Due to the gapless arrangement of the mixing chamber on the exhaust gas duct, an additional line connecting the mixing chamber and the exhaust gas duct can be dispensed with ammer be heated by the exhaust duct, for example, to promote evaporation of the reducing agent or melt deposits of the reducing agent in the mixing chamber.
  • the measures listed in the dependent claims advantageous refinements and improvements of the specified exhaust aftertreatment system and the specified method are possible.
  • the reducing agent line at least in an opening into the mixing chamber section, is designed as a capillary. Due to the high adhesion forces between the liquid reducing agent and the wall of the capillary, an uncontrolled entry of the reducing agent from the reducing agent line into the mixing chamber is avoided. Thus, only reducing agent enters the mixing chamber, if the reducing agent in the capillary is additionally set under a, compared to the pressure in the mixing chamber, increased pressure. Furthermore, the free surface of the reducing agent with respect to the interface to the outlet opening in the mixing chamber is small, so that there is only a slight evaporation of the reducing agent.
  • a throttle is arranged in the reducing agent line between the metering pump and the mixing chamber. Through the throttle pressure fluctuations in the reducing agent line can be damped, so that no unwanted metering of reducing agent into the mixing chamber.
  • heating means in particular an exhaust gas are provided in the exhaust passage, which heat the mixing chamber to a temperature above a melting temperature of crystallization of the reducing agent.
  • the heating means such as an electrical resistance heater
  • the mixing chamber can also be heated to a temperature above the melting temperature of crystallization of the reducing agent in operating points of the internal combustion engine in which the heat supplied by the exhaust gas of the internal combustion engine alone is insufficient.
  • conveying means are provided which convey the reducing agent, in particular in a shutdown request for the internal combustion engine, from the reducing agent line in the reservoir.
  • the conveying means in particular of the metering pump different funding, the reducing agent from the reducing agent line can be conveyed back into the reservoir, which can be dispensed with a freeze-resistant design of the system and the components of the system of low mate- rials, for example, simple polymer materials manufactured can be.
  • the mixing chamber is connected via a spray tube with an exhaust passage of an internal combustion engine.
  • the atomized reducing agent can be supplied to the exhaust passage such that the exiting reducing agent does not deposit on the walls of the exhaust passage.
  • a valve in particular a check valve, is arranged.
  • the compressed gas supply to the mixing chamber can be interrupted or opened as needed, whereby the demand for compressed gas, compared to a continuous supply of the mixing chamber with compressed gas, is reduced.
  • a return impact valve which additionally prevents backflow of the reducing agent from the mixing chamber into the pressurized gas supply.
  • valve in the compressed gas supply and the metering pump are controlled by a common control unit, as can be the amount of supplied compressed gas ideally adapted to the supplied by the metering amount of the reducing agent.
  • FIGS. 1 and 2 identical components or components having the same function are identified by the same reference numerals.
  • Fig. 1 shows a first embodiment of an exhaust aftertreatment system according to the invention.
  • FIG. 3 shows a further alternative embodiment of an exhaust aftertreatment system according to the invention.
  • FIG. 4 shows a further alternative exemplary embodiment of an exhaust aftertreatment system according to the invention.
  • FIG. 1 shows an exhaust gas aftertreatment system 10 according to the invention.
  • a reservoir 40 for a reducing agent 42 is connected via a line 43, 45 with a delivery unit 50.
  • a filter 44 is arranged in the line 43,45 .
  • the delivery unit 50 comprises a metering pump 55 and a prefilter 52.
  • the delivery unit 50 is connected via a reducing agent line 60 to a first input 71 of a mixing chamber 70.
  • the delivery unit 50 is spatially separated from the mixing chamber 70.
  • the mixing chamber 70 has a second input 72, via which a compressed gas supply 30 is connected to the mixing chamber 70.
  • the pressurized gas supply 30 comprises a pressurized gas source 32, from which a gas 33 under a pressure can be supplied to the mixing chamber 70 via a supply line 34, 36.
  • a valve 35 is arranged, with which the compressed gas source 32 can be separated from the mixing chamber 70.
  • the mixing chamber 70 has a mixing space 75 into which the supply line 34, 36 and the reducing agent line 60 open. Between the first input 71 of the mixing chamber 70 and the mixing space 75, a filter 74 and a throttle 73 are arranged in the reducing agent line 60.
  • a spray pipe 77 leads into an exhaust gas duct 20 of an internal combustion engine 5, wherein the mixing chamber 70 or the mixing space 75 are arranged directly on an exhaust-carrying region of the exhaust gas duct 20.
  • a device 25 for exhaust aftertreatment in the exhaust passage 20 is arranged in the exhaust gas flow direction downstream of the spray tube 77.
  • a control unit 80 is connected via a signal line 82 to the metering pump 55 of the delivery unit 50.
  • the control unit 80 is connected via a further signal line 84 to the valve 35.
  • the metering pump 55 of the delivery unit 50 is valve-free connected to the exhaust passage 20, ie between the output of the metering pump 55 and the exhaust passage no valve is arranged, the metering pump 55 itself, however, may have a known pressure-side valve to complete a compression space in the metering pump 55.
  • the exhaust gas of the engine 5 flows through the exhaust passage 20 to the exhaust gas aftertreatment device 25.
  • a reducing agent 42 can be metered into the exhaust duct 20 exhaust duct 20 via the spray tube 77.
  • the control of the exhaust aftertreatment system 10 is carried out by the control unit 80, via which the metering pump 55 of the delivery unit 50 is driven.
  • the reducing agent 42 is conveyed from the reservoir 40 via the line 43 to a first filter 44, in which particles and impurities are filtered out of the reducing agent. Via the line 45, the reducing agent 42 is further promoted to the delivery unit 50. In the delivery unit 50, the reducing agent 42 flows through a further filter 52, in which again impurities and particles are filtered out of the reducing agent 42, and reaches the metering pump 55.
  • the metering pump 55 measures depending on the signal of the control device 80, a quantity of the reducing agent 42 and promotes this amount of reducing agent 42 via the reducing agent line 60 to the first input 71 of the mixing chamber 70.
  • the reducing agent 42 flows through another filter 74 and a throttle 73 before it enters the mixing chamber 75.
  • the reducing agent 42 is atomized by means of a gas 33, wherein the supply of the gas 33 via a line 36 which is connected to a second input 72 of the mixing chamber 70.
  • the compressed gas supply 30 is connected, wherein the gas 33 flows from the compressed gas source 32, for example a compressed air reservoir, via the line 34, 36 to the mixing chamber 75 of the mixing chamber 70.
  • the gas is 33, preferably compressed air, under a relation to the pressure in the exhaust passage 20 and in the mixing chamber 75 increased pressure, for example, a pressure between 5 and 20bar.
  • the line 34, 36 by a valve 35 which is controlled by the controller 80, the connection between the compressed gas source 32 and the mixing chamber 70 close.
  • the valve 35 and the metering pump 55 via the control unit 80 and the need of the gas 33 for atomizing the reducing agent 42 are adapted to the supplied by the metering pump 55 to the mixing chamber 70 and the mixing chamber 75 amount of the reducing agent 42.
  • the atomized reducing agent 42 in particular an aerosol of the reducing agent 42, is supplied from the mixing chamber 75 via the spray tube 77 to the exhaust passage 20 and there supports the exhaust aftertreatment in the device 25 for exhaust aftertreatment.
  • a reducing agent 42 find, for example, aqueous urea solution or fuel, in particular diesel fuel, for the reduction of nitrogen oxides use.
  • the control of the valve 35 for example a solenoid valve, is carried out electrically, but can also be done mechanically, pneumatically or hydraulically.
  • the control of the metering pump 55 is also preferably carried out electrically, but is not limited to electrical drive sources.
  • the filters 44, 52, 74 in particular the filters 52 and 74, at least partially eliminated.
  • the throttle 73 in the reducing agent line 60 the entire reducing agent line 60 or at least the part of the reducing agent line 60 which opens into the mixing space 75 can also be designed as a capillary.
  • the throttle 73 can be completely eliminated.
  • FIG. 2 discloses a further exemplary embodiment of an exhaust aftertreatment system 10 according to the invention.
  • a mixing chamber 70 arranged directly on the exhaust duct 20 has two inlets 71, 72, the mixing chamber being connected to the delivery unit 50 via the first inlet 71 through the reducing agent line 60.
  • the second input 72 of the mixing chamber 70 is connected in this embodiment via a second line 34 for the gas 33 to the delivery unit 50.
  • the delivery unit 50 includes the metering pump 55, with which the reducing agent 42 are supplied from the reservoir 40 of the mixing chamber 70 can.
  • the delivery unit 50 has a compressed gas supply 30 with a further pump 90, wherein the further pump 90 is connected via a line 92 to the environment.
  • a drive unit 91 for example an electric motor, is arranged.
  • an air filter 29 is arranged in line 92.
  • the line 34 which connects the further pump 30 with the mixing chamber 75 of the mixing chamber 70, comprises a storage volume 37 and a further filter 38 to filter out impurities from the compressed gas 33.
  • the delivery unit 50 is connected via a line 43,45 with the reservoir 40 for the reducing agent 42, wherein from the reducing agent line 60, which connects the metering pump 55 of the delivery unit 50 with the mixing chamber 75 of the mixing chamber 70, a return line 57,59 branches off for returning the reducing agent 42 in the line 45 in front of the metering pump 55 opens.
  • a first, preferably electrically switchable, valve 53 and a check valve 54 is arranged in the return line 57, 59.
  • a control unit 80 is connected via a first signal line 82 to the metering pump 55 and via a second signal line 84 to the further pump 90 or the drive unit 91 of the further pump 90.
  • the metering pump 55 is actuated via the control unit 80, which conveys the reducing agent 42 to the mixing space 75 of the mixing chamber 70.
  • the further pump 90 is controlled by the control unit 80 directly or by means of the drive unit 91, whereby the mixing chamber 75 according to the amount of the supplied reducing agent 42, a corresponding amount of gas 33, in particular compressed air, is supplied, with which the reducing agent 42 in the mixing chamber 75 is atomized.
  • the valve 53 is closed, whereby the return line 57, 59 is interrupted and a return flow of the reducing agent 42 via the return line 57, 59 is prevented.
  • the return line 57, 59 is also interrupted by the check valve 54 in order not to bypass the metering produce pump 55, so that no reducing agent 42, for example, by an increase in pressure in the reservoir 40 on the metering pump 55 can flow past into the mixing chamber 70.
  • the need-based supply of reducing agent 42 and of the gas 33 required for atomizing the reducing agent 42 avoids unnecessary transport of fluids, as a result of which the exhaust-gas aftertreatment system 10 is particularly energy-efficient. If there is a shutdown request for the internal combustion engine 5 during normal operation of the exhaust aftertreatment system 10, parts of the exhaust aftertreatment system 10, in particular the mixing chamber 70 and the reducing agent line 60, are emptied. For this purpose, the valve 53 is opened.
  • pressurized gas 33 is fed to the mixing space 75, which presses the reducing agent 42 back into the mixing chamber 70 and into the reducing agent line 60.
  • the gas 33 By the gas 33, the reducing agent 42 is conveyed via the return line 57, 59 and the lines 45, 43 back into the reservoir 40.
  • the check valve 54 opens by the pressure of the gas 33 and the back-flowing reducing agent 33, whereby the connection via the return line 57, 59 is released.
  • FIG. 3 shows a further, alternative embodiment of an exhaust aftertreatment system 10 according to the invention.
  • the structure corresponds largely to the structure of FIG. 1, so that will be discussed below only on the differences.
  • the reservoir 40 for the reducing agent 42 is connected via lines 43, 45 to the delivery unit 50, which in turn are connected via the reducing agent line 60 to the first input 71 of the mixing chamber 70.
  • the mixing chamber 70 has a mixing space 75, which is arranged within an exhaust gas leading portion of the exhaust passage 20.
  • a continuation of the reducing agent line 60 in the mixing chamber 70 has a filter 74 and a throttle 73, preferably a supercritical throttle, which are arranged between the first input 71 of the mixing chamber 70 and the mixing chamber 75.
  • the mixing space 75 is above a Compressed gas supply 30, which is connected to the second input 72 of the mixing chamber 70, acted upon by a pressurized gas 33, wherein between the second input 72 and the mixing chamber, a filter 38, a throttle 79 and a check valve 39 are arranged.
  • heating means 78 are arranged in the form of an electrical heating resistor, with which the mixing chamber 75 can be additionally heated.
  • the delivery unit 50 has, in addition to the metering pump 55, a return line 57, 59, in which a remindsaugpumpe 58 is arranged.
  • the return line 57, 59 represents a bypass to the metering pump 55, wherein the reducing agent 42 is connected from the reducing agent line 60 through the remindsaugpumpe 58 via the return line 57, 59 and the lines 45,43 with the reservoir 40.
  • the control unit 80 is connected to the metering pump 55 via a first signal line 82. Via a second signal line 84, the control device 80 is connected to the valve 35 in the line 34, 36, which connects the compressed gas source 32 with the mixing chamber 75 of the mixing chamber 70.
  • a third signal line 86 leads from the controller 80 to the suction pump 58.
  • the metering of the reducing agent 42 is analogous to the comments on Fig. 1 and Fig. 2. Since it may occur in the use of reducing agents which contain soluble substances, such as aqueous urea solution, crystallization of these substances may be in the reducing agent 42 leading areas of the exhaust aftertreatment system, for example in the mixing chamber 70, in particular in the mixing chamber 75 in the spray tube 77, deposits and / or crystallization, which reduce the fluidic connection from the reservoir 40 to the exhaust duct 20 in cross section or completely clog, which a functional impairment can lead to failure of the exhaust aftertreatment system 10.
  • additional heating means 78 such as an electrical resistance heating or extended to operating conditions of the internal combustion engine 5, in which the supplied via the exhaust gas of the internal combustion engine 5 heat alone is not sufficient to melt the crystallization or decomposition of the deposits.
  • additional heating means 78 may also be integrated in the embodiments of FIGS. 1, 2 and 4 according to the embodiment of FIG. 3.
  • the additional heating means 78 and the mixing chamber 70 or the mixing chamber 75 and the spray tube 77 are heated solely by the heat of the exhaust gas in the exhaust duct 20 in such a way that the crystallization of the deposits or decomposition of the deposits occurs.
  • the return line 57,59 is closed by the remindsaugpumpe 58, so that no bypass of the metering pump 55 is possible.
  • the reducing agent 42 is conveyed from the reducing agent line 60 through the remindsaugpumpe 58 back into the reservoir 40.
  • FIG. 4 shows a further embodiment of an exhaust aftertreatment system according to the invention.
  • the embodiment of FIG. 4 differs from the embodiment of FIG. 2 only in so far that the further pump 90 is not integrated into the delivery unit 50, but the other pump 90, and standing with the other pump 90 in a directly functional relationship Air filter 29 and / or the optional storage volume 37 and the further filter 38 outside the delivery unit, in particular spatially separated from the delivery unit, is arranged.
  • the further pump 90 is driven by a drive unit 91 which, for example, is an electric motor.
  • the function corresponds largely to the embodiment of FIG. 2, however, the delivery unit 50 is less complex in manufacturing and assembly due to the smaller number of components and the other pump 90 can at any point, in particular remote from the exhaust duct 20 and or the reducing agent 42, be arranged.

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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

L'invention concerne un système de post-traitement de gaz d'échappement (10), ainsi qu'un procédé d'introduction d'un agent de réduction (42) dans un canal pour gaz d'échappement (20) d'un moteur à combustion interne (5). Le système de post-traitement de gaz d'échappement (10) comprend un réservoir (40), une pompe de dosage (55), une chambre de mélange (70) ainsi qu'une alimentation en gaz comprimé (30). La pompe de dosage (55) transporte l'agent de réduction (42) depuis le réservoir (40) vers la chambre de mélange (70), l'alimentation en gaz comprimé (30) introduisant un gaz (33) dans la chambre de mélange (70) de sorte que l'agent de réduction (42) est pulvérisé. La chambre de mélange (70) est espacée de la pompe de dosage (55), la pompe de dosage (55) alimentant la chambre de mélange (70) en agent de réduction (42) par le biais d'une conduite d'agent de réduction (60). La chambre de mélange (70) est directement agencée sur une zone de passage des gaz d'échappement du canal pour gaz d'échappement (20). La mesure de l'agent de réduction (42) du canal pour gaz d'échappement (20) s'effectue par le biais de la pompe de dosage (55).
PCT/EP2012/073794 2011-11-29 2012-11-28 Système de post-traitement des gaz d'échappement et procédé d'introduction d'un agent de réduction dans un canal pour gaz d'échappement d'un moteur à combustion interne WO2013079509A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
RU2014126214A RU2643277C1 (ru) 2011-11-29 2012-11-28 Система снижения токсичности отработавших газов и способ подачи восстановителя в выпускной тракт двигателя внутреннего сгорания
CN201280056397.5A CN103946500A (zh) 2011-11-29 2012-11-28 用于将还原剂施加到内燃机的废气通道中的废气再处理系统及方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011087288.4 2011-11-29
DE102011087288A DE102011087288A1 (de) 2011-11-29 2011-11-29 Abgasnachbehandlungssystem und Verfahren zum Einbringen eines Reduktionsmittels in einen Abgaskanal einer Brennkraftmaschine

Publications (1)

Publication Number Publication Date
WO2013079509A1 true WO2013079509A1 (fr) 2013-06-06

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Country Link
CN (1) CN103946500A (fr)
DE (1) DE102011087288A1 (fr)
RU (1) RU2643277C1 (fr)
WO (1) WO2013079509A1 (fr)

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DE102016208171A1 (de) * 2016-05-12 2017-11-16 Robert Bosch Gmbh Vorrichtung und Verfahren zum Verbessern der Rücksaugbarkeit von Reduktionsmittel in einem Abgasreduktionssystem
DE102016013816A1 (de) * 2016-11-21 2018-05-24 Albonair Gmbh Reduktionsmitteldosiersystem mit Leitungsbeheizung
JP2023088038A (ja) * 2021-12-14 2023-06-26 ヤンマーホールディングス株式会社 還元剤供給装置
KR102621892B1 (ko) * 2023-04-05 2024-01-09 에스티엑스엔진 주식회사 액상 유체 분사 구조

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