EP2273082A1 - Vorrichtung zur Aufrechterhaltung einer Harnstofflösung in einem flüssigen Zustand zur Behandlung von Dieselabgas - Google Patents

Vorrichtung zur Aufrechterhaltung einer Harnstofflösung in einem flüssigen Zustand zur Behandlung von Dieselabgas Download PDF

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Publication number
EP2273082A1
EP2273082A1 EP10168398A EP10168398A EP2273082A1 EP 2273082 A1 EP2273082 A1 EP 2273082A1 EP 10168398 A EP10168398 A EP 10168398A EP 10168398 A EP10168398 A EP 10168398A EP 2273082 A1 EP2273082 A1 EP 2273082A1
Authority
EP
European Patent Office
Prior art keywords
solution
storage tank
urea
hot gas
accordance
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Withdrawn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
EP10168398A
Other languages
English (en)
French (fr)
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 US12/499,860 external-priority patent/US20110005206A1/en
Priority claimed from US12/499,850 external-priority patent/US20110005213A1/en
Application filed by Delphi Technologies Inc filed Critical Delphi Technologies Inc
Publication of EP2273082A1 publication Critical patent/EP2273082A1/de
Withdrawn legal-status Critical Current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 start-up 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.
  • 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 is derived from waste heat in engine exhaust gas and is added to the system either by passing a portion of the exhaust gas stream directly through the solution or by passing air heated by the exhaust gas stream directly through the solution.
  • the hot gas may be impinged onto an outer surface of the storage tank.
  • a portion of an exemplary prior art system 10 for supplying a solution 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 porting mechanization 140 attached to the vehicle exhaust pipe, such as an electrically-operated valve assembly.
  • an optional filter 142 may be provided to purify exhaust gas 130 for additional cleanness of the gas into storage tank 118.
  • a delta pressure sensor 144 may be employed across filter 142 to monitor filter condition.
  • Another 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.
  • the diverted exhaust gas is directed either into or against the outside of urea storage tank 118.
  • a currently preferred arrangement is to direct the exhaust gas 130 onto or through solution 20 within storage tank 118, whether frozen or liquid, via a sparger 152, in which arrangement cooled exhaust gas 130' then exits storage tank 118 via a tank vent port 154.
  • a side benefit of first embodiment 110 is that tank vent 154 is readily thawed in the event that it has been frozen shut by internal splash of urea solution or external road spray. This arrangement eliminates a potential failure mode wherein liquid solution cannot not be pumped from reservoir tank module 16 into diesel exhaust emissions control system 12 ( FIG. 1 ) because built up vacuum in storage tank 118 cannot be relieved via a frozen vent 154.
  • a second side benefit of first embodiment 110 is that the top surface of frozen urea solution 20 is heated directly by the impinging gasses. This liquid urea solution will descend to the bottom of the storage tank 118 along the walls of the tank module 16 and become available to replenish the tank module 16. This function eliminates the condition where an air gap forms around the perimeter of the tank module 16 after the melted urea solution is drawn away from the surroundings of the tank module 16. This condition would cause the emission abatement system to stop functioning due to lack of supply of liquid urea solution.
  • This arrangement can create an exhaust-disposal problem if, for example, system 110 is conveniently located within the engine compartment of a vehicle.
  • a second exhaust pipe (not shown) may be required to dispose safely of cooled exhaust gas 130' from vent 154.
  • Second embodiment 210 of an improved system for supplying a solution of urea to a diesel exhaust emissions control system avoids this problem.
  • Second embodiment 210 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 exhaust gas per se into or against storage tank 118 as in first embodiment 110, heat is abstracted from the engine exhaust system or a component thereof 224 in known fashion, such as by a conventional finned heat exchanger or other hot air collector 226.
  • Hot air 230 rather than hot exhaust gas 130 is then fed into system 210 via a line fan 228.
  • the flow path is substantially the same as for hot exhaust gas 130 in FIG. 2 ; however, a substantial benefit of the slightly greater system complexity (heat collector and fan plus controls) is that only cooled air 230' exits vent 154.

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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)
EP10168398A 2009-07-09 2010-07-05 Vorrichtung zur Aufrechterhaltung einer Harnstofflösung in einem flüssigen Zustand zur Behandlung von Dieselabgas Withdrawn EP2273082A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
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
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

Publications (1)

Publication Number Publication Date
EP2273082A1 true EP2273082A1 (de) 2011-01-12

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Application Number Title Priority Date Filing Date
EP10168399A Withdrawn EP2273083A1 (de) 2009-07-09 2010-07-05 Vorrichtung zur Aufrechterhaltung einer Harnstofflösung in einem flüssigen Zustand zur Behandlung von Dieselabgas
EP10168398A Withdrawn EP2273082A1 (de) 2009-07-09 2010-07-05 Vorrichtung zur Aufrechterhaltung einer Harnstofflösung in einem flüssigen Zustand zur Behandlung von Dieselabgas

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Application Number Title Priority Date Filing Date
EP10168399A Withdrawn EP2273083A1 (de) 2009-07-09 2010-07-05 Vorrichtung zur Aufrechterhaltung einer Harnstofflösung in einem flüssigen Zustand zur Behandlung von Dieselabgas

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104395572A (zh) * 2012-07-24 2015-03-04 优迪卡汽车株式会社 排气净化装置、液体还原剂或者其前体的解冻方法
US10245534B2 (en) 2015-05-28 2019-04-02 Shaw Development, Llc Filter inline heater
CN112347618A (zh) * 2020-10-21 2021-02-09 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
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0878608A2 (de) * 1997-05-13 1998-11-18 Daimler-Benz Aktiengesellschaft Verfahren und Vorrichtung zur Stickoxidreduktion im Abgas einer Verbrennungseinrichtung
US6387336B2 (en) 1997-07-03 2002-05-14 Robert Bosch Gmbh Method and device for selective catalytic NOx reduction
WO2006087553A1 (en) * 2005-02-16 2006-08-24 Imi Vision Limited Exhaust as treatment
KR20070059641A (ko) * 2005-12-07 2007-06-12 현대자동차주식회사 디젤엔진의 요소 저장탱크 가열장치
US20080092531A1 (en) 2006-10-19 2008-04-24 Denso Corporation Exhaust purification device of engine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6363771B1 (en) * 1999-11-24 2002-04-02 Caterpillar Inc. Emissions diagnostic system
EP2065578A1 (de) * 2007-11-28 2009-06-03 International Engine Intellectual Property Heizsystem für in einem Abgasreinigungssystem verwendete Reagenzen
DE102008001020B4 (de) * 2008-04-07 2022-09-29 Robert Bosch Gmbh Reduktionsmittelbehälter mit Latentwärmespeicher

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0878608A2 (de) * 1997-05-13 1998-11-18 Daimler-Benz Aktiengesellschaft Verfahren und Vorrichtung zur Stickoxidreduktion im Abgas einer Verbrennungseinrichtung
US6387336B2 (en) 1997-07-03 2002-05-14 Robert Bosch Gmbh Method and device for selective catalytic NOx reduction
WO2006087553A1 (en) * 2005-02-16 2006-08-24 Imi Vision Limited Exhaust as treatment
KR20070059641A (ko) * 2005-12-07 2007-06-12 현대자동차주식회사 디젤엔진의 요소 저장탱크 가열장치
US20080092531A1 (en) 2006-10-19 2008-04-24 Denso Corporation Exhaust purification device of engine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104395572A (zh) * 2012-07-24 2015-03-04 优迪卡汽车株式会社 排气净化装置、液体还原剂或者其前体的解冻方法
EP2886815A4 (de) * 2012-07-24 2016-03-16 Ud Trucks Corp Abgasreinigungsvorrichtung und verfahren zum auftauen eines flüssigen reduktionsmittels oder vorläufers davon
US9732650B2 (en) 2012-07-24 2017-08-15 Ud Trucks Corporation Exhaust gas purification apparatus, and method for thawing liquid reducing agent or precursor thereof
US10245534B2 (en) 2015-05-28 2019-04-02 Shaw Development, Llc Filter inline heater
US11318401B2 (en) 2015-05-28 2022-05-03 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
CN112347618A (zh) * 2020-10-21 2021-02-09 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

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