WO2012101230A1 - Système scr d'urée - Google Patents

Système scr d'urée Download PDF

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Publication number
WO2012101230A1
WO2012101230A1 PCT/EP2012/051265 EP2012051265W WO2012101230A1 WO 2012101230 A1 WO2012101230 A1 WO 2012101230A1 EP 2012051265 W EP2012051265 W EP 2012051265W WO 2012101230 A1 WO2012101230 A1 WO 2012101230A1
Authority
WO
WIPO (PCT)
Prior art keywords
pump
urea
pressure regulator
scr system
injector
Prior art date
Application number
PCT/EP2012/051265
Other languages
English (en)
Inventor
Pierric Besnard
Original Assignee
Inergy Automotive Systems Research (Société Anonyme)
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 (Société Anonyme) filed Critical Inergy Automotive Systems Research (Société Anonyme)
Publication of WO2012101230A1 publication Critical patent/WO2012101230A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/04—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being hot or corrosive
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • F04B17/046—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids the fluid flowing through the moving part of the motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/08—Regulating by delivery pressure
    • 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
    • F01N2610/1433—Pumps
    • 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 urea SCR system comprising a metering pump (preferably of the piston type) and a pressure regulator.
  • the system used by most heavy goods vehicle manufacturers for reducing ⁇ emissions to the required value 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
  • the supply device comprises a rotary pump driven by a motor and which is regulated to supply the injector with urea solution at a given pressure.
  • Gear pumps give good results in practice and as to the driving motors, those with magnetic coupling give good results since they allow heating of the urea solution (see for instance WO 2009/147146 in the name of the Applicant).
  • Such pumps have however several drawbacks: they are rather complicated, expensive and since the magnetic coils, the case being, are generally not surrounding the cavity through which the liquid flows, heating is not optimum.
  • the present invention aims at solving that problem by providing a urea SCR system comprising a metering pump and a pressure regulator.
  • metering pumps are regulated to deliver a given flow rate and not a given pressure, which makes them unsuitable as such for SCR systems with an injector that must be supplied at constant pressure.
  • the present invention solves that problem by coupling a pressure regulator to the metering pump.
  • this pump is a piston pump driven by a magnetic coil wherein the coils are surrounding the internal volume where the liquid flows so that it can easily be unfrozen.
  • the present invention applies to an SCR system i.e. a system able to meter a reducing agent capable of reducing the NO x present in the exhaust gases of the engine of a vehicle engine by Selective Catalytic Reduction. This is
  • ammonia precursor in aqueous solution advantageously an ammonia precursor in aqueous solution.
  • the invention gives good results with aqueous solutions of urea and in particular, eutectic water/urea solutions such as solutions of AdBlue ® , the urea content of which is between 31.8 wt% and 33.2 wt% and which contain around 18% of ammonia.
  • the invention may also be applied to urea/ammonium formate mixtures also in aqueous solution, sold under the trademark Denoxium ® and which contain around 13% of ammonia.
  • the latter have the advantage, with respect to urea, of freezing only from -35°C onwards (as opposed to -11°C), but have the disadvantages of corrosion problems linked to the release of formic acid.
  • the SCR system comprises a metering pump (of the piston type preferably), an injector and a pressure regulator which is either located downstream of the pump (first embodiment) or integrated to it (second embodiment).
  • the second embodiment is preferred because it is simpler, implies less hydraulic connections and allows defrosting the regulator together with the pump (which is especially easy with magnetic driven pumps as explained above).
  • the first embodiment allows having less pressure variations.
  • the injector is a regulated injector.
  • the dosing is done by the opening time of the injector supplied with urea at a defined pressure.
  • the injector is a "passive" injector.
  • the dosing is done by the metering pump itself.
  • Figure 1 attached relates to the first option (pressure regulator downstream of the pump) and Figure 2, to a preferred embodiment of the second option (pressure regulator integrated to the pump).
  • Figure 1 shows an SCR system 100 with a urea tank 11, an injector 12, a piston/metering pump 13 and a mechanical pressure regulator 14 (ball+spring or plate+spring, etc..) in order to supply urea to the injector 12.
  • a mechanical pressure regulator 14 ball+spring or plate+spring, etc..
  • This system allows regulating the pressure delivered to the injector thanks to the use of a pump combined with a pressure regulator.
  • FIG. 1 shows an SCR piston pump 200 with an integrated pressure regulator 21, leading to:

Landscapes

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

Abstract

La présente invention se rapporte à un système SCR comprenant une pompe de mesure et un régulateur de pression.
PCT/EP2012/051265 2011-01-27 2012-01-26 Système scr d'urée WO2012101230A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP11152347 2011-01-27
EP11152347.8 2011-01-27

Publications (1)

Publication Number Publication Date
WO2012101230A1 true WO2012101230A1 (fr) 2012-08-02

Family

ID=45540876

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/051265 WO2012101230A1 (fr) 2011-01-27 2012-01-26 Système scr d'urée

Country Status (1)

Country Link
WO (1) WO2012101230A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109012175A (zh) * 2013-03-22 2018-12-18 日本碍子株式会社 还原剂喷射装置、废气处理装置以及废气处理方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002025075A1 (fr) * 2000-09-22 2002-03-28 Robert Bosch Gmbh Dispositif pour le dosage d'un agent de reduction
WO2003027454A1 (fr) * 2001-09-25 2003-04-03 Argillon Gmbh Pompe a agents de reduction pour systeme de traitement de gaz d'echappement d'un moteur a combustion interne
WO2009147146A1 (fr) 2008-06-03 2009-12-10 Inergy Automotive Systems Research (Société Anonyme) Procédé pour démarrer un système de réduction catalytique sélective
WO2010119116A2 (fr) * 2009-04-16 2010-10-21 Inergy Automotive Systems Research (Société Anonyme) Système et procédé de stockage d'un additif et d'injection de celui-ci dans les gaz d'échappement d'un moteur

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002025075A1 (fr) * 2000-09-22 2002-03-28 Robert Bosch Gmbh Dispositif pour le dosage d'un agent de reduction
WO2003027454A1 (fr) * 2001-09-25 2003-04-03 Argillon Gmbh Pompe a agents de reduction pour systeme de traitement de gaz d'echappement d'un moteur a combustion interne
WO2009147146A1 (fr) 2008-06-03 2009-12-10 Inergy Automotive Systems Research (Société Anonyme) Procédé pour démarrer un système de réduction catalytique sélective
WO2010119116A2 (fr) * 2009-04-16 2010-10-21 Inergy Automotive Systems Research (Société Anonyme) Système et procédé de stockage d'un additif et d'injection de celui-ci dans les gaz d'échappement d'un moteur

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109012175A (zh) * 2013-03-22 2018-12-18 日本碍子株式会社 还原剂喷射装置、废气处理装置以及废气处理方法

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