WO2012107315A1 - Système scr (réduction catalytique sélective) pour moteur à combustion interne - Google Patents

Système scr (réduction catalytique sélective) pour moteur à combustion interne Download PDF

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Publication number
WO2012107315A1
WO2012107315A1 PCT/EP2012/051495 EP2012051495W WO2012107315A1 WO 2012107315 A1 WO2012107315 A1 WO 2012107315A1 EP 2012051495 W EP2012051495 W EP 2012051495W WO 2012107315 A1 WO2012107315 A1 WO 2012107315A1
Authority
WO
WIPO (PCT)
Prior art keywords
tank
liquid
passage
level
tanks
Prior art date
Application number
PCT/EP2012/051495
Other languages
English (en)
Inventor
Philippe Lucien Valmy GEORIS
Joel Op De Beeck
Original Assignee
Inergy Automotive Systems Research
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 Inergy Automotive Systems Research filed Critical Inergy Automotive Systems Research
Publication of WO2012107315A1 publication Critical patent/WO2012107315A1/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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • 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
    • 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 application relates to an SCR system for an internal combustion engine.
  • the system used by most manufacturers of heavy goods vehicles for reducing NO x emissions to the required value generally consists in carrying out a selective catalytic reaction with reducing agents such as urea ("Urea SCR" or selective catalytic reduction using ammonia generated in situ in the exhaust gases by an ammonia precursor, for example by decomposition of a urea solution).
  • reducing agents such as urea
  • Urea SCR or selective catalytic reduction using ammonia generated in situ in the exhaust gases by an ammonia precursor, for example by decomposition of a urea solution.
  • ammonia precursor will be referred to as "urea" in the remainder of the description, but it should be noted that other liquid precursors may be suitable.
  • 5,884,475 describes the use of 2 urea tanks in series: one for storage, referred to as passive and one of smaller volume, referred to as active, which is heated and which is used for starting in the event of freezing.
  • the passive tank is located above the active tank so that the urea can be transferred by gravity from one tank to the other, which means that a transfer pump is not required.
  • the present invention aims to solve this problem and to provide an SCR system having an architecture with 2 tanks located at different levels, the upper tank of which makes it possible to gravity fill the lower tank while enabling the latter to be efficiently vented.
  • the present invention relates to an SCR system for an internal combustion engine comprising a first tank (1) and a second tank (2) equipped with a venting system, located at a level below that of the first tank (1) and that may be gravity filled with liquid originating from the first tank (1), according to which the passage between the two tanks is equipped with a device that closes off said passage under the effect of the hydrostatic pressure of the liquid of the first tank (1) and that only opens up said passage when the level of liquid in the second tank (2) is below a setpoint level.
  • the present invention may be applied to any internal combustion engine.
  • the liquid concerned by the present invention is an ammonia precursor, and preferably urea.
  • urea is understood to mean any, generally aqueous, solution containing urea.
  • the invention gives good results with eutectic water/urea solutions for which there is a quality standard: for example, according to the standard DIN 70070, in the case of the AdBlue ® solution
  • the urea content is between 31.8% and 33.2% (by weight) (i.e. 32.5 +/- 0.7 wt%) hence implying an available amount of ammonia between 18.0% and 18.8%.
  • the invention may also be applied to the urea/ammonium formate mixtures, also in aqueous solution, sold under the trade name DenoxiumTM and of which one of the compositions (Denoxium-30) contains an amount of ammonia equivalent to that of the Adblue ® solution.
  • the latter have the advantage of only freezing below -30°C (as opposed to -11°C), but have the disadvantages of corrosion problems linked to the possible release of formic acid and a less available market (whereas urea is widely used and readily available even in fields such as agriculture).
  • the present invention is particularly advantageous in the context of eutectic water/urea solutions.
  • the liquid is held in tanks (1) and (2) which may be made from any material, preferably one having good chemical resistance to the liquid in question. In general, this is metal or plastic.
  • Polyolefins in particular polyethylene (and more particularly HDPE or high-density
  • polyethylene constitute preferred materials, in particular in the case where the liquid is urea.
  • These tanks may be produced by any processing method known in the case of hollow bodies.
  • One preferred processing method in particular when the tanks are made of plastic, and in particular HDPE, is the extrusion-blow moulding process.
  • a parison in one or more parts is obtained by extrusion, and is then shaped by blow moulding in a mould.
  • One-part moulding of the tank from a single parison gives good results.
  • the two tanks are rigid.
  • the first tank (1) is a flexible bag as described above, whilst the second tank (2) has a rigid wall.
  • the first tank (1) is a flexible bag "taken" from a commercial packaging of an Adblue ® solution consisting of a bag-in-box, i.e. a cardboard box comprising an inner flexible bag, generally of square/rectangular section.
  • the second tank (2) is provided with a heating element.
  • This tank (2) is also advantageously provided with a base plate or mounting plate (i.e. a support having substantially the shape of a plate) onto which at least one active accessory of the urea storage system and/or injection system is attached.
  • This base plate generally has a perimeter, closed up on itself, of any shape. Usually, its perimeter has a circular shape.
  • This base plate is generally attached to the upper wall or to the lower wall of the tank and it incorporates at least one active storage and/or injection component. This means that the component is attached to or produced as one part with the base plate. This component may be incorporated inside tank (2), or outside of it with, if necessary, a connection (delivery tube) passing through it.
  • the base plate according to this variant of the invention incorporates several active storage and/or metering components and, very particularly preferably, it incorporates all the active components which are in contact with the liquid additive found in, coming out of or going into tank (2).
  • the component is chosen from the following elements: a pump; a filter; a level gauge; a temperature sensor; a quality sensor; a pressure sensor and a pressure regulator. It is advantageous for the feed pump to be incorporated into such a base plate and for this base plate to also incorporate other active components (preferably all the active components) as defined above.
  • the second tank (2) comprises a fill pipe whilst the first tank (1) is in fact a make-up tank that is attached to or brought into contact with the second tank and it does not necessarily have to have a fill pipe (since it is somewhat like a reserve/make-up cartridge).
  • the first tank (1) When the first tank (1) is rigid, it is preferable to either to vent it, or to add a pressure-equalizing line that opens, for example, into the fill pipe. When it is flexible on the other hand, it is possible to work without such arrangements.
  • the passage between the two tanks is equipped with a device that closes off said passage under the effect of the hydrostatic pressure of the liquid of the first tank (1) and that only opens up said passage when the level of liquid in the second tank (2) is below a setpoint level.
  • the term "passage” may be understood to mean a simple opening, but preferably it is a pipe, and preferably a pipe connected to a hole in the bottom of the first tank (1) and comes out substantially in the bottom of the second tank (2) also.
  • the closure device is also located in the bottom of this pipe and therefore, in the bottom of the second tank (2) so that the setpoint level is close to the bottom (almost empty) level of this tank.
  • the closure device comprises a float
  • Figures 1 and 2 relate to a same variant with a rigid first tank (1), and they illustrate the fact that the float opens up the transfer pipe (line) as soon as the level of liquid in the tank (2) drops below a certain level.
  • Figure 3 relates to a variant where the first tank (1) is a flexible bag.
  • This bag is included in a cradle. Although it is illustrated laid flat, a variant according to which it is bag with a square/rectangular section placed on one tip and therefore inclined (preferably at 45°) gives good results in practice.

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

L'invention porte sur un système SCR pour un moteur à combustion interne, comprenant un premier réservoir (1) et un second réservoir (2) équipé d'un système de ventilation, placé à un niveau inférieur à celui du premier réservoir (1) et qui peut être rempli par gravité de liquide provenant du premier réservoir (1), le passage entre les deux réservoirs étant équipé d'un dispositif qui ferme ledit passage sous l'effet de la pression hydrostatique du liquide présent dans le premier réservoir (1) et qui n'ouvre ledit passage que lorsque le niveau du liquide dans le second réservoir (2) est inférieur à un niveau de consigne.
PCT/EP2012/051495 2011-02-10 2012-01-31 Système scr (réduction catalytique sélective) pour moteur à combustion interne WO2012107315A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2011/0086 2011-02-10
BE201100086 2011-02-10

Publications (1)

Publication Number Publication Date
WO2012107315A1 true WO2012107315A1 (fr) 2012-08-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/051495 WO2012107315A1 (fr) 2011-02-10 2012-01-31 Système scr (réduction catalytique sélective) pour moteur à combustion interne

Country Status (1)

Country Link
WO (1) WO2012107315A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015082827A1 (fr) * 2013-12-02 2015-06-11 Inergy Automotive Systems Research (Société Anonyme) Système de stockage perfectionné d'un additif liquide
DE102014207169A1 (de) * 2014-04-15 2015-10-15 Bayerische Motoren Werke Aktiengesellschaft Tankvorrichtung für ein Kraftfahrzeug
DE102016206392A1 (de) 2016-04-15 2017-10-19 Bayerische Motoren Werke Aktiengesellschaft Fahrzeug-Tanksystem, insbesondere für ein flüssiges Reduktionsmittel, mit zumindest zwei voneinander getrennt angeordneten Behältern
US10344659B2 (en) 2014-12-04 2019-07-09 Cummins Power Generation Ip, Inc. Auxiliary diesel exhaust fluid systems

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB836075A (en) * 1957-07-24 1960-06-01 George Hamilton Elliott Improvements in or relating to tanks and other containers intended to be repeatedly filled with liquids
JP2007055353A (ja) * 2005-08-23 2007-03-08 Nissan Diesel Motor Co Ltd 液体タンク装置
EP1810866A2 (fr) * 2006-01-18 2007-07-25 Cnh U.K. Limited Réservoir de carburant pour véhicule agricole
EP2014886A1 (fr) * 2007-07-09 2009-01-14 Delphi Technologies, Inc. Récipient pour le dosage d'un liquide
FR2921911A1 (fr) * 2007-09-21 2009-04-10 Inergy Automotive Systems Res Systeme de stockage et d'injection d'une solution d'additif dans des gaz d'echappement d'un moteur.
DE102008034223A1 (de) * 2008-07-23 2010-01-28 Bayerische Motoren Werke Aktiengesellschaft Reduktionsmitteltank zum Bereitstellen von Reduktionsmittel an einer Abgasanlage mit Absperrventil
DE102008060937A1 (de) * 2008-12-06 2010-06-10 Daimler Ag Kraftfahrzeug-Behälteranordnung
WO2010078990A1 (fr) * 2009-01-09 2010-07-15 Robert Bosch Gmbh Système pour introduire un agent réduisant les polluants dans des gaz d'échappement

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB836075A (en) * 1957-07-24 1960-06-01 George Hamilton Elliott Improvements in or relating to tanks and other containers intended to be repeatedly filled with liquids
JP2007055353A (ja) * 2005-08-23 2007-03-08 Nissan Diesel Motor Co Ltd 液体タンク装置
EP1810866A2 (fr) * 2006-01-18 2007-07-25 Cnh U.K. Limited Réservoir de carburant pour véhicule agricole
EP2014886A1 (fr) * 2007-07-09 2009-01-14 Delphi Technologies, Inc. Récipient pour le dosage d'un liquide
FR2921911A1 (fr) * 2007-09-21 2009-04-10 Inergy Automotive Systems Res Systeme de stockage et d'injection d'une solution d'additif dans des gaz d'echappement d'un moteur.
DE102008034223A1 (de) * 2008-07-23 2010-01-28 Bayerische Motoren Werke Aktiengesellschaft Reduktionsmitteltank zum Bereitstellen von Reduktionsmittel an einer Abgasanlage mit Absperrventil
DE102008060937A1 (de) * 2008-12-06 2010-06-10 Daimler Ag Kraftfahrzeug-Behälteranordnung
WO2010078990A1 (fr) * 2009-01-09 2010-07-15 Robert Bosch Gmbh Système pour introduire un agent réduisant les polluants dans des gaz d'échappement

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015082827A1 (fr) * 2013-12-02 2015-06-11 Inergy Automotive Systems Research (Société Anonyme) Système de stockage perfectionné d'un additif liquide
DE102014207169A1 (de) * 2014-04-15 2015-10-15 Bayerische Motoren Werke Aktiengesellschaft Tankvorrichtung für ein Kraftfahrzeug
US10344659B2 (en) 2014-12-04 2019-07-09 Cummins Power Generation Ip, Inc. Auxiliary diesel exhaust fluid systems
DE102016206392A1 (de) 2016-04-15 2017-10-19 Bayerische Motoren Werke Aktiengesellschaft Fahrzeug-Tanksystem, insbesondere für ein flüssiges Reduktionsmittel, mit zumindest zwei voneinander getrennt angeordneten Behältern
DE102016206392B4 (de) 2016-04-15 2022-03-10 Bayerische Motoren Werke Aktiengesellschaft Fahrzeug-Tanksystem, insbesondere für ein flüssiges Reduktionsmittel, mit zumindest zwei voneinander getrennt angeordneten Behältern

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