EP3126645A1 - Anti-clogging device for diesel exhaust fluid supply - Google Patents

Anti-clogging device for diesel exhaust fluid supply

Info

Publication number
EP3126645A1
EP3126645A1 EP15774127.3A EP15774127A EP3126645A1 EP 3126645 A1 EP3126645 A1 EP 3126645A1 EP 15774127 A EP15774127 A EP 15774127A EP 3126645 A1 EP3126645 A1 EP 3126645A1
Authority
EP
European Patent Office
Prior art keywords
dosing module
reservoir
def
inlet
feed line
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Withdrawn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
EP15774127.3A
Other languages
German (de)
French (fr)
Other versions
EP3126645A4 (en
Inventor
JR. Harry Edward GORMAN
John Bartel
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.)
Volvo Truck Corp
Original Assignee
Volvo Truck Corp
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 Volvo Truck Corp filed Critical Volvo Truck Corp
Publication of EP3126645A1 publication Critical patent/EP3126645A1/en
Publication of EP3126645A4 publication Critical patent/EP3126645A4/en
Withdrawn legal-status Critical Current

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]
    • 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
    • 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
    • F01N2610/14—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
    • F01N2610/1433—Pumps
    • 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
    • F01N2610/1493—Purging the reducing agent out of the conduits or nozzle
    • 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 invention relates to Diesel Exhaust Fluid dosing apparatuses for vehicles, and more particularly to a device for alleviating clogging of the dosing apparatus.
  • Diesel Exhaust Fluid commonly referred to as AdBlue in Europe, is an aqueous urea solution of 32.5% high-purity urea and 67.5% deionized water.
  • DEF is consumed as a reactant in selective catalytic reduction (SCR) systems to lower the NOx content in the diesel exhaust emissions from diesel engines.
  • SCR selective catalytic reduction
  • DEF is typically carried on the vehicle in a supply tank and a dosing apparatus draws DEF from the tank and injects it into the exhaust upstream of an SCR catalyst.
  • the urea is converted via thermolysis and hydrolysis into ammonia. Inside the SCR catalyst body, the ammonia then reduces the nitrogen oxides (NOx) into water and nitrogen.
  • NOx nitrogen oxides
  • a dosing apparatus in addition to the supply tank, will typically include a supply module having a pump and a dosing module including a valve and injector.
  • urea Under certain conditions, in particular with exposure of DEF in the dosing module to exhaust gas heat, urea can crystallize out of the DEF solution and collect in the dosing module components, which can prevent free movement of the injector. Crystallized urea will rapidly dissolve on contact with DEF; however, when the injector is stuck, air in the supply line becomes a pressurized pocket that prevents DEF from flowing to the dosing module.
  • One solution known in the art is a dosing valve having a return line for continuous flow of DEF through the dosing module.
  • the invention proposes a solution to the clogging problem.
  • a reservoir is placed at the dosing valve inlet on a T-connection.
  • the reservoir provides a closed chamber to receive trapped air in the DEF supply line, allowing DEF to flow to the dosing module.
  • DEF contacts the crystallized urea causing the clog, the urea dissolves, freeing the injector so that normal action of the dosing module is restored.
  • the appended Figure shows a schematic view of a DEF dosing apparatus according to the invention.
  • the apparatus includes a DEF supply tank 10, a pump (or supply module) 20, and a dosing module 30.
  • a supply line 15 connects the pump inlet 22 to the supply tank 10.
  • a feed line 24 connects the pump outlet 26 to a T connector 40.
  • the T connector 40 has an inlet 42 to receive DEF from the pump 20, a first outlet 44 to deliver DEF to the dosing module 30 and a second outlet 46 connecting to a reservoir 50.
  • the reservoir 50 is a closed chamber, which may be a capped pipe, for example, or another vessel that can be connected in fluid communication with the line between the pump and dosing module to accept air that would otherwise be trapped in the line between the pump and the dosing module if urea has crystallized in the dosing module.
  • the apparatus facilitates the flow of DEF even when crystallized urea might cause a blockage.
  • the reservoir 50 may be placed vertically above the dosing module 30.

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

An apparatus for supplying Diesel Exhaust Fluid to an engine exhaust gas treatment system includes a reservoir to collect trapped air if the dosing module is clogged with crystalized urea. The reservoir is placed at the dosing valve inlet on a T-connection. The reservoir provides a closed chamber to receive trapped air in the DEF supply line, allowing DEF to flow to the dosing module. When DEF contacts the crystallized urea causing the clog, the urea dissolves, freeing the injector so that normal action of the dosing module is restored.

Description

ANTI-CLOGGING DEVICE FOR DIESEL EXHAUST FLUID SUPPLY Field of the Invention
The invention relates to Diesel Exhaust Fluid dosing apparatuses for vehicles, and more particularly to a device for alleviating clogging of the dosing apparatus.
Background and Summary
Diesel Exhaust Fluid (DEF), commonly referred to as AdBlue in Europe, is an aqueous urea solution of 32.5% high-purity urea and 67.5% deionized water. DEF is consumed as a reactant in selective catalytic reduction (SCR) systems to lower the NOx content in the diesel exhaust emissions from diesel engines.
DEF is typically carried on the vehicle in a supply tank and a dosing apparatus draws DEF from the tank and injects it into the exhaust upstream of an SCR catalyst. The urea is converted via thermolysis and hydrolysis into ammonia. Inside the SCR catalyst body, the ammonia then reduces the nitrogen oxides (NOx) into water and nitrogen.
A dosing apparatus, in addition to the supply tank, will typically include a supply module having a pump and a dosing module including a valve and injector.
Under certain conditions, in particular with exposure of DEF in the dosing module to exhaust gas heat, urea can crystallize out of the DEF solution and collect in the dosing module components, which can prevent free movement of the injector. Crystallized urea will rapidly dissolve on contact with DEF; however, when the injector is stuck, air in the supply line becomes a pressurized pocket that prevents DEF from flowing to the dosing module.
One solution known in the art is a dosing valve having a return line for continuous flow of DEF through the dosing module.
The invention proposes a solution to the clogging problem.
According to the invention, a reservoir is placed at the dosing valve inlet on a T-connection. The reservoir provides a closed chamber to receive trapped air in the DEF supply line, allowing DEF to flow to the dosing module. When DEF contacts the crystallized urea causing the clog, the urea dissolves, freeing the injector so that normal action of the dosing module is restored.
Brief Description of the Drawing
The sole Figure is a schematic view of an apparatus according to the invention. Detailed Description
The appended Figure shows a schematic view of a DEF dosing apparatus according to the invention.
The apparatus includes a DEF supply tank 10, a pump (or supply module) 20, and a dosing module 30. A supply line 15 connects the pump inlet 22 to the supply tank 10. A feed line 24 connects the pump outlet 26 to a T connector 40.
The T connector 40 has an inlet 42 to receive DEF from the pump 20, a first outlet 44 to deliver DEF to the dosing module 30 and a second outlet 46 connecting to a reservoir 50. The reservoir 50 is a closed chamber, which may be a capped pipe, for example, or another vessel that can be connected in fluid communication with the line between the pump and dosing module to accept air that would otherwise be trapped in the line between the pump and the dosing module if urea has crystallized in the dosing module. By providing a chamber for the air trapped in the line, the apparatus facilitates the flow of DEF even when crystallized urea might cause a blockage.
The reservoir 50 may be placed vertically above the dosing module 30.
When DEF flows to and contacts the crystallized urea, the crystallized urea dissolves, freeing the dosing injector.
In the present application, the use of terms such as "including" is open-ended and is intended to have the same meaning as terms such as "comprising" and not preclude the presence of other structure, material, or acts. Similarly, though the use of terms such as "can" or "may" is intended to be open-ended and to reflect that structure, material, or acts are not necessary, the failure to use such terms is not intended to reflect that structure, material, or acts are essential. To the extent that structure, material, or acts are presently considered to be essential, they are identified as such.
While this invention has been illustrated and described in accordance with a preferred embodiment, it is recognized that variations and changes may be made therein without departing from the invention as set forth in the claims.

Claims

We claim:
1. An apparatus for delivering aqueous urea fluid into an exhaust gas system of a combustion engine, comprising:
a dosing module mountable on an engine exhaust conduit and configured to deliver aqueous urea fluid to the exhaust conduit;
a feed line connected to carry aqueous urea fluid to an inlet of the dosing module; and, a reservoir for collecting air trapped in the feed line connected to the feed line at the inlet of the dosing module.
2. The apparatus of claim 1, comprising a pump connected on the feed line to deliver aqueous urea fluid to the feed line.
3. The apparatus of claim 2, comprising an aqueous urea fluid supply tank and a supply line connecting the supply tank to the pump.
4. The apparatus of claim 1, wherein the feed line includes a branch at the inlet of the dosing module, the reservoir connected to the branch.
5. The apparatus of claim 1, wherein the reservoir is vertically above the dosing module.
6. An apparatus for delivering aqueous urea fluid to an exhaust gas system of a combustion engine, comprising:
a supply tank 10 for storing aqueous urea fluid;
a pump 20 having an inlet and an outlet, the inlet connected by a supply line to the supply tank;
a dosing module 30;
a feed line 24 connecting the pump outlet 26 to the dosing module, the feed line having a T- connector at the dosing module, the T connector 40 having an inlet 42 to receive DEF from the pump 20, a first outlet 44 to deliver DEF to the dosing module 30, and a second outlet 46;
a reservoir 50 connected to the second outlet to collect air trapped at an inlet of the dosing module.
7. The apparatus of claim 6, wherein the reservoir 50 is a closed chamber.
EP15774127.3A 2014-04-04 2015-03-27 Anti-clogging device for diesel exhaust fluid supply Withdrawn EP3126645A4 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201461975152P 2014-04-04 2014-04-04
PCT/US2015/023042 WO2015153350A1 (en) 2014-04-04 2015-03-27 Anti-clogging device for diesel exhaust fluid supply

Publications (2)

Publication Number Publication Date
EP3126645A1 true EP3126645A1 (en) 2017-02-08
EP3126645A4 EP3126645A4 (en) 2018-01-17

Family

ID=54241140

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15774127.3A Withdrawn EP3126645A4 (en) 2014-04-04 2015-03-27 Anti-clogging device for diesel exhaust fluid supply

Country Status (3)

Country Link
US (1) US20170002710A1 (en)
EP (1) EP3126645A4 (en)
WO (1) WO2015153350A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3333386B1 (en) 2016-12-12 2019-08-28 Perkins Engines Company Limited Injector deposit dissolution system and method
DE102017215950A1 (en) * 2017-09-11 2019-03-14 Robert Bosch Gmbh Connector for fluid lines of an exhaust aftertreatment system
CN111120054B (en) * 2019-12-30 2021-04-16 潍柴动力股份有限公司 Control method for reducing urea crystallization of engine SCR (Selective catalytic reduction) box

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008530446A (en) * 2005-02-16 2008-08-07 アイエムアイ・ビジョン・リミテッド Exhaust gas treatment
DE102006061732A1 (en) * 2006-12-28 2008-07-03 Robert Bosch Gmbh Liquid reducing agent dosage device for reduction of nitrogen oxides in exhaust gas, has storage container connected with work container, and storage pump for pumping liquid reducing agent from storage container to work container
DE102006061734A1 (en) * 2006-12-28 2008-07-03 Robert Bosch Gmbh Liquid reducing agent e.g. aqueous urea solution, dosing device for e.g. diesel-operated internal combustion engine, of motor vehicle, has dosing line connected with operating container, which is connected with storage container
DE102009005790B4 (en) * 2009-01-22 2023-05-17 Albonair Gmbh dosing system
EP2151559B1 (en) * 2008-08-08 2011-04-06 Magneti Marelli S.p.A. Injection device for injecting a reducing substance into an exhaust system of an internal combustion engine
US8584707B2 (en) * 2009-04-22 2013-11-19 International Engine Intellectual Property Company, Llc Dosing manifold assembly
JP5625475B2 (en) * 2010-05-17 2014-11-19 いすゞ自動車株式会社 Exhaust gas purification system
DE102012208936A1 (en) * 2012-05-29 2013-12-05 Robert Bosch Gmbh Injection system, exhaust aftertreatment device

Also Published As

Publication number Publication date
EP3126645A4 (en) 2018-01-17
WO2015153350A1 (en) 2015-10-08
US20170002710A1 (en) 2017-01-05

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