EP2273083A1 - Appareil pour conserver une solution d'urée dans un état liquide pour le traitement d'échappement pour diesel - Google Patents

Appareil pour conserver une solution d'urée dans un état liquide pour le traitement d'échappement pour diesel Download PDF

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Publication number
EP2273083A1
EP2273083A1 EP10168399A EP10168399A EP2273083A1 EP 2273083 A1 EP2273083 A1 EP 2273083A1 EP 10168399 A EP10168399 A EP 10168399A EP 10168399 A EP10168399 A EP 10168399A EP 2273083 A1 EP2273083 A1 EP 2273083A1
Authority
EP
European Patent Office
Prior art keywords
solution
urea
storage tank
exhaust gas
exhaust
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10168399A
Other languages
German (de)
English (en)
Inventor
Bob X. Li
Joseph V. Bonadies
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.)
Delphi Technologies Inc
Original Assignee
Delphi Technologies Inc
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
Priority claimed from US12/499,850 external-priority patent/US20110005213A1/en
Priority claimed from US12/499,860 external-priority patent/US20110005206A1/en
Application filed by Delphi Technologies Inc filed Critical Delphi Technologies Inc
Publication of EP2273083A1 publication Critical patent/EP2273083A1/fr
Withdrawn legal-status Critical Current

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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
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
    • 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
    • F01N2410/00—By-passing, at least partially, exhaust from inlet to outlet of apparatus, to atmosphere or to other device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1406—Storage means for substances, e.g. tanks or reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1466—Means for venting air out of conduits or tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1486—Means to prevent the substance from freezing

Definitions

  • the present invention relates to emissions control in compression-ignited internal combustion engines; more particularly, to systems for injecting urea into diesel exhaust to scavenge nitrogen oxides and rejuvenating a diesel particulate filter; and most particularly, to a system for heating and liquefying a storage tank solution of urea at normally sub-freezing urea-solution temperatures.
  • urea injection systems are commonly in use in the prior art.
  • An aqueous urea solution is injected into the hot exhaust pipe, where urea is hydrolyzed into ammonia ahead of a selective catalytic reduction (SCR) converter.
  • SCR selective catalytic reduction
  • Ammonia reacts with NOx trapped on the catalyst face to form N 2 , CO 2 , and H 2 O, thereby lowering the level of noxious emissions in the exhaust.
  • a serious problem in the prior art is that at temperatures below about -11°C, the urea solution can freeze.
  • a thermal heating system and method are required to thaw the solid solution into a liquid solution (or to keep the solution from freezing) to permit a pump to draw solution for delivery into an engine emissions abatement system.
  • a typical prior art urea supply system comprises a relatively small reservoir tank module from which liquid urea solution is dispensed into a diesel engine exhaust system, and a larger storage tank in which the tank module is immersed.
  • the tank module contains a resistance heater that can liquefy suitable quantities of solution in a short time upon engine startup under cold conditions, as is required to meet government air pollution standards. Solution in the surrounding storage tank then is heated by transfer of heat through the walls of the heated reservoir tank module.
  • the storage tank be able to re-supply the reservoir tank module within a short time after starting of the engine.
  • meeting this requirement can be difficult because of limited heat flow through the walls of the reservoir tank module, which typically is formed of a plastic polymer having relatively low thermal conductivity.
  • US Patent No. 6,387,336 discloses generally that an electric heating system and/or a heating device that uses waste heat of the engine coolant and/or the exhaust gas can be used to heat the frozen urea.
  • exhaust gas may be passed through the jacket of a doublewalled feed pipe between the storage tank and the point of injection. It is not disclosed or suggested to pass exhaust gas through a heat exchanger disposed within the stored solution in the storage tank.
  • a system for keeping a reservoir solution of urea in a liquid state at normally sub-freezing temperatures comprises a reservoir tank module disposed in a storage tank.
  • the reservoir tank module preferably includes a level sensing apparatus, inlet and outlet ports for supplying and withdrawing urea solution, and at least one heating element.
  • the walls of the reservoir tank module are preferably immersed in urea solution contained in the storage tank, which solution is partially heated by passage of heat through the walls of the reservoir tank module.
  • additional heat for melting frozen urea solution in the storage tank is derived from waste heat in engine exhaust gas and is added to the system by passing a portion of the exhaust gas stream through a gas/liquid heat exchanger disposed within the solution in the storage tank.
  • the cooled exhaust gas may be conveniently disposed of either by being returned to the tailpipe or by feeding the exhaust gas into the engine intake manifold in a method of exhaust gas recirculation (EGR).
  • EGR exhaust gas recirculation
  • a portion of an exemplary prior art system 10 for supplying a solution 20 of urea to a diesel exhaust emissions abatement system 12 for a diesel engine 14 comprises a reservoir tank module 16 disposed within a storage tank 18 for urea solution 20.
  • Solution 20 enters tank module 16 via an inlet 22 and is dispensed via an outlet 24.
  • a heater 26 is disposed within tank module 16 for liquefying solution 20 within module 16. Excess heat from heater 26 is intended to pass through the walls 28 of tank module 16 and locally liquefy solution 20 in proximity to tank module 16 and inlet 22 to allow gravitational replenishment of solution into tank module 16.
  • walls 28 of reservoir tank module 16 are typically formed of a plastic polymer having relatively low thermal conductivity such that at extreme low temperature conditions insufficient heat is passed into storage tank 18 to maintain an adequate rate of liquefaction and replenishment.
  • a portion 130 of the exhaust stream 132 from engine 14 is diverted, preferably following the diesel particulate filter 134 and before the engine muffler 136 and tail pipe 138.
  • Portion 130 is preferably diverted by a porting mechanization 140 attached to the vehicle exhaust pipe, such as an electrically-operated valve assembly.
  • a pressure sensor 146 combined with a temperature sensor 148 on the bypass flow line 150 may be employed to enable calculation of the flow rate of exhaust portion 130 and thereby assist in controlling flow through porting mechanism 140.
  • the diverted exhaust gas portion 130 is directed through a gas/liquid heat exchanger 152 disposed within the urea solution 20 in urea storage tank 118.
  • This arrangement can create an exhaust-disposal problem if, for example, system 110 is conveniently located within the engine compartment of a vehicle. Therefore, cooled exhaust gas 130' exits storage tank 118 via a tank port 154 and is directed back into the engine exhaust system via return line 156.
  • the exit and return points in the exhaust system for gas 130,130' can be selected anywhere that provides a pressure drop sufficient to cause gas flow through heat exchanger 152, but preferably either upstream or downstream of all emissions abatement components such that no untreated exhaust escapes the exhaust system.
  • bypass flow line 150 for exhaust gas portion 130 passes through reservoir tank module 116 where some auxiliary heating of solution 20 occurs by heat loss from line 150.
  • a second embodiment 210 of an improved system for supplying a solution of urea to a diesel exhaust emissions control system is very similar to first embodiment 110 and employs numerous identical components, so indicated by the same numbers as in FIG. 2 .
  • the difference is that, instead of piping cooled exhaust gas 130' back into the exhaust system via return line 156, gas 130' is piped via line 256 to the intake manifold of engine 14 for use in an EGR method as is well known in the engine arts. Otherwise, the flow path of gas 130 is substantially the same as in FIG. 2 .

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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)
EP10168399A 2009-07-09 2010-07-05 Appareil pour conserver une solution d'urée dans un état liquide pour le traitement d'échappement pour diesel Withdrawn EP2273083A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/499,850 US20110005213A1 (en) 2009-07-09 2009-07-09 Apparatus for Maintaining a Urea Solution in a Liquid State for Treatment of Diesel Exhaust
US12/499,860 US20110005206A1 (en) 2009-07-09 2009-07-09 Apparatus for Maintaining a Urea Solution in a Liquid State for Treatment of Diesel Exhaust

Publications (1)

Publication Number Publication Date
EP2273083A1 true EP2273083A1 (fr) 2011-01-12

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Application Number Title Priority Date Filing Date
EP10168399A Withdrawn EP2273083A1 (fr) 2009-07-09 2010-07-05 Appareil pour conserver une solution d'urée dans un état liquide pour le traitement d'échappement pour diesel
EP10168398A Withdrawn EP2273082A1 (fr) 2009-07-09 2010-07-05 Appareil pour conserver une solution d'urée dans un état liquide pour le traitement d'échappement pour diesel

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP10168398A Withdrawn EP2273082A1 (fr) 2009-07-09 2010-07-05 Appareil pour conserver une solution d'urée dans un état liquide pour le traitement d'échappement pour diesel

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5859651B2 (ja) 2012-07-24 2016-02-10 Ｕｄトラックス株式会社 排気浄化装置、液体還元剤又はその前駆体の解凍方法
US10245534B2 (en) 2015-05-28 2019-04-02 Shaw Development, Llc Filter inline heater
DE102019118528B4 (de) 2019-07-09 2022-08-11 Volkswagen Aktiengesellschaft Temperierungssystem für ein Reduktionsmittel zur Abgasnachbehandlung eines Verbrennungsmotors sowie Verfahren zur Temperierung eines solchen Reduktionsmittels
CN112347618B (zh) * 2020-10-21 2023-03-31 潍柴动力股份有限公司 一种确定尿素解冻效率的方法、装置及存储介质

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001038704A1 (fr) * 1999-11-24 2001-05-31 Caterpillar Inc. Systeme de diagnostic d'emissions
US6387336B2 (en) 1997-07-03 2002-05-14 Robert Bosch Gmbh Method and device for selective catalytic NOx reduction
US20080092531A1 (en) 2006-10-19 2008-04-24 Denso Corporation Exhaust purification device of engine
EP2065578A1 (fr) * 2007-11-28 2009-06-03 International Engine Intellectual Property Système de chauffage pour produit chimique utilisé dans un système de purification des gaz d'échappement
DE102008001020A1 (de) * 2008-04-07 2009-10-08 Robert Bosch Gmbh Reduktionsmittelbehälter mit Latentwärmespeicher

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19719998C2 (de) * 1997-05-13 2003-10-30 Daimler Chrysler Ag Verfahren und Vorrichtung zur Stickoxidreduktion im Abgas einer Verbrennungseinrichtung
JP2008530447A (ja) * 2005-02-16 2008-08-07 アイエムアイ・ビジョン・リミテッド 排気ガス処理
KR20070059641A (ko) * 2005-12-07 2007-06-12 현대자동차주식회사 디젤엔진의 요소 저장탱크 가열장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6387336B2 (en) 1997-07-03 2002-05-14 Robert Bosch Gmbh Method and device for selective catalytic NOx reduction
WO2001038704A1 (fr) * 1999-11-24 2001-05-31 Caterpillar Inc. Systeme de diagnostic d'emissions
US20080092531A1 (en) 2006-10-19 2008-04-24 Denso Corporation Exhaust purification device of engine
EP2065578A1 (fr) * 2007-11-28 2009-06-03 International Engine Intellectual Property Système de chauffage pour produit chimique utilisé dans un système de purification des gaz d'échappement
DE102008001020A1 (de) * 2008-04-07 2009-10-08 Robert Bosch Gmbh Reduktionsmittelbehälter mit Latentwärmespeicher

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