GB2560374A - Multi doser SCR system - Google Patents

Multi doser SCR system Download PDF

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Publication number
GB2560374A
GB2560374A GB1703855.5A GB201703855A GB2560374A GB 2560374 A GB2560374 A GB 2560374A GB 201703855 A GB201703855 A GB 201703855A GB 2560374 A GB2560374 A GB 2560374A
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Prior art keywords
doser
last
reagent
dosers
line
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Application number
GB1703855.5A
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GB2560374B (en
GB201703855D0 (en
Inventor
R Craig Andrew
A P Sykes Martin
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Delphi International Operations Luxembourg SARL
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Delphi International Operations Luxembourg SARL
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Priority to GB1703855.5A priority Critical patent/GB2560374B/en
Publication of GB201703855D0 publication Critical patent/GB201703855D0/en
Priority to PCT/EP2018/055517 priority patent/WO2018162508A1/en
Publication of GB2560374A publication Critical patent/GB2560374A/en
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Publication of GB2560374B publication Critical patent/GB2560374B/en
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Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • 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
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • 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

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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)

Abstract

A Selective Catalytic Reduction (SCR) system 10 comprises a tank 12 (containing a reagent R), a pump 14, a first doser 16 and a last doser 30. The dosers are arranged in-line. A first feed pipe 18 connects the first doser and the pump. A last feed pipe is arranged between the first doser and the last doser. A plurality of dosers may be arranged in series so each doser receives reagent from the previous doser in line. All the dosers apart from the last doser may have an inlet 22 for receiving reagent and an outlet 24 for delivering reagent to the next doser in line. All the feed pipes in the system may directly extend from an outlet to an inlet of a doser. The system may be free from connecting blocks, manifolds, distributors and T-junctions.

Description

(54) Title of the Invention: Multi doser SCR system Abstract Title: Multi doser SCR system (57) A Selective Catalytic Reduction (SCR) system 10 comprises a tank 12 (containing a reagent R), a pump 14, a first doser 16 and a last doser 30. The dosers are arranged in-line. A first feed pipe 18 connects the first doser and the pump. A last feed pipe is arranged between the first doser and the last doser. A plurality of dosers may be arranged in series so each doser receives reagent from the previous doser in line. All the dosers apart from the last doser may have an inlet 22 for receiving reagent and an outlet 24 for delivering reagent to the next doser in line. All the feed pipes in the system may directly extend from an outlet to an inlet of a doser. The system may be free from connecting blocks, manifolds, distributors and T-junctions.
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Figure GB2560374A_D0001
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Figure GB2560374A_D0002
Multi doser SCR system
TECHNICAL FIELD
The present invention relates to a SCR system having several doser organised in an in-line architecture.
BACKGROUND OF THE INVENTION
Multi-doser Selective Catalytic Reduction (SCR) systems are adapted to spray reagent in the exhaust gases of an internal combustion engine. Said systems have a tank filled with reagent and a pump flowing said reagent to a plurality of dosers. The dosers of said system are connected in parallel to the outlet of the pump or to a common manifold, or via “T” or “Y” junction elements. Such complex and expensive system architecture are typically provided for engines having several bank of cylinders, V6 type for instance, or requiring spray upstream and downstream the exhaust pipe.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to resolve the above mentioned problems in providing a Selective Catalytic Reduction system (SCR system) comprising a tank, a pump, a first doser, a last doser for injecting in an exhaust pipe reagent stored in the tank and delivered by the pump to the dosers, the dosers being arranged in-line. The system further comprises a first feed pipe inter-connected between the first doser and the pump and, a last feed pipe arranged between the first doser and the last doser.
The first doser is provided with an inlet for receiving reagent from the pump and, an outlet for delivering reagent to the last doser.
The SCR system further comprises a second doser inserted in the line between the first doser and the last doser, said second doser receiving reagent from the first doser via the first feed pipe and delivering reagent to the last doser via the last feed pipe.
In a further alternative, the SCR system comprises a plurality of dosers arranged in-line one after the other wherein, the first doser in the line is the only doser to receive the reagent from the pump, all the other dosers from the second to the last receiving reagent R from the previous doser in the line.
All the dosers from the first to the last but one in the line have an inlet for receiving reagent R and, an outlet for delivering reagent to the next doser in line.
All the feed pipes of the system directly extend from an outlet, to the inlet, of a doser.
The system is free from connecting blocks, manifold, distributors, Tjunction or any element adapted to divide the flow in a plurality of routes joining as many dosers.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is now described by way of example with reference to the accompanying figure 1 which sketches a SCR system as per the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A powertrain system comprises an internal combustion engine and an exhaust pipe wherein exhaust gases are filtered and chemically treated to remove pollutants prior to exiting the tailpipe. The powertrain system further comprises a selective catalytic reduction system 10, hereafter SCR system 10, adapted to spray a reagent R, such as urea fluid, at an injection point of the pipe.
Engines having two or more banks of cylinders, such as V6 engines, have several exhaust pipes and thus several reagent injection points. It is also common to have reagent injection in the hot part of the exhaust pipe, upstream a particulate filter and also, in the cold part of the pipe downstream said filter.
More in details in reference to the figure 1, the SCR system 10 comprises a tank 12 storing the reagent R, a pump 14 immersed in the reagent R is arranged to suck said reagent R and deliver it to a first doser 16 adapted to spray the reagent R at a first injection point Pl of the exhaust pipe. To flow the reagent from the pump 14 to said first doser 16, a first feed pipe 18 is connected to the pump outlet 20 and it extend to the first doser inlet 22. Said first doser 16 is also provided with an outlet 24 connected to another feed pipe, which in the example shown is a last feed pipe 26 extending to the inlet 28 of a last doser 30 adapted to spray the reagent R at a last injection point P30 of the exhaust pipe.
An electronic control unit 32, ECU, electrically connected to the dosers 16, 30 delivers command signal to said dosers also, to avoid freezing of the reagent R, or to thaw a frozen system, heater elements 34 are arranged in several points of the system, in the tank and over the length of the feed lines.
Furthermore, the dosers of the SCR system can be air cooled, as the first doser 16 shown, or liquid cooled as the last doser 30 is. Also, the pump 14 represented immersed in the tank may be arranged outside the tank with a suction line from its inlet to the reagent R.
The SCR system 10 has an in-line organisation of the dosers, the last doser 30 receiving reagent R from the first doser 16 rather than directly from the pump. The fluid connection is done by the first doser 16 that is provided with an inlet 22 and with an outlet 24. This in-line architecture advantageously simplifies and frees the system 10 from any flow dividing elements such as connection blocks, T-junction elements, manifold, distributors arranged away from the dosers between two in a feed pipe.
Such an architecture can be extended to SCR systems 10, not shown, provided with three dosers. In this case a second doser 36 is inserted in the line between the first doser 16 and the last doser 30. The first doser receives reagent R from the pump 14, the second doser 36 receives reagent R from the first doser 16 and, the last doser 30 receives reagent R from the second doser 36. Said second doser 36 is then provided, similarly to the first doser 16, with and inlet 22 and with an outlet 24.
More generally, an SCR system 10 having one pump 14, “n” dosers arranged in-line comprises “n” feed pipes, as many as injectors. The first feed pipe 18 is arranged between the pump 14 and the first doser 16 and, the other n-1 feed pipes are arranged between consecutive dosers. In such architecture of SCR system, the first doser as well as all the intermediate dosers, from the second to the last but one, are provided with an inlet 22 and with an outlet 24. The nth doser 30, last in the line, connected to said last but one doser has just an inlet 28.
LIST OF REFERENCES R reagent
P1 first inj ection point
P30 last injection point
SCR system tank pump first doser first feed pipe pump outlet first doser inlet first doser outlet last feed pipe inlet of the last doser last doser
ECU heater electrical connector second doser

Claims (7)

1. Selective Catalytic Reduction system (10) (SCR system) comprising a tank (12), a pump (14), a first doser (16), a last doser (30) for injecting in an exhaust pipe reagent (R) stored in the tank (12) and delivered by the pump (14) to the dosers, said dosers being arranged in-line, the system (10) further comprising a first feed pipe (18) inter-connected between the first doser (16) and the pump (14) and, a last feed pipe arranged between the first doser (16) and the last doser (30).
2. SCR system (10) as claimed in the preceding claim wherein the first doser (16) is provided with an inlet (22) for receiving reagent (R) from the pump (14) and, an outlet (24) for delivering reagent (R) to the last doser (30).
3. SCR system (10) as claimed in any one of the preceding claims further comprising a second doser (36) inserted in the line between the first doser (16) and the last doser (30), said second doser (36) receiving reagent (R) from the first doser (16) via the first feed pipe (18) and delivering reagent (R) to the last doser (30) via the last feed pipe (26).
4. SCR system (10) as claimed in any of the preceding claims comprising a plurality of dosers (16, 36, 30) arranged in-line one after the other wherein, the first doser (16) in the line is the only doser to receive the reagent (R) from the pump (14), all the other dosers from the second (36) to the last (30) receiving reagent (R) from the previous doser in the line.
5. SCR system (10) as claimed in claim 4 wherein all the dosers from the first (16) to the last but one in the line have an inlet (22) for receiving reagent (R) and, an outlet (24) for delivering reagent (24) to the next doser in line.
6. SCR system (10) as claimed in claim 5 wherein all the feed pipes of the system directly extend from an outlet (20, 24) to the inlet (22, 28) of a doser.
7. SCR system (10) as claimed in any of the preceding claims wherein the system (10) is free from connecting blocks, manifold, distributors, T-junction or any element adapted to divide the flow in a plurality of routes joining as many dosers.
Intellectual
Property
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Application No: GB1703855.5 Examiner: Rachel Smith
GB1703855.5A 2017-03-10 2017-03-10 Multi doser SCR system Active GB2560374B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1703855.5A GB2560374B (en) 2017-03-10 2017-03-10 Multi doser SCR system
PCT/EP2018/055517 WO2018162508A1 (en) 2017-03-10 2018-03-06 Multi doser scr system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1703855.5A GB2560374B (en) 2017-03-10 2017-03-10 Multi doser SCR system

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GB201703855D0 GB201703855D0 (en) 2017-04-26
GB2560374A true GB2560374A (en) 2018-09-12
GB2560374B GB2560374B (en) 2019-08-14

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014014399A1 (en) * 2012-07-05 2014-01-23 Scania Cv Ab Method pertaining to an scr system and an scr system.
US20140360168A1 (en) * 2013-06-07 2014-12-11 Jeffrey Michael Broderick System and Method for Sequential Injection of Reagent to Reduce NOx from Combustion Sources
DE102014201816A1 (en) * 2014-01-31 2015-06-18 Mtu Friedrichshafen Gmbh System for dosing of reducing agent in an exhaust device of an internal combustion engine and internal combustion engine

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009027182A1 (en) * 2009-06-25 2010-12-30 Robert Bosch Gmbh Injection system for injecting fluid into an exhaust tract
US10036314B2 (en) * 2016-01-11 2018-07-31 Caterpillar Inc. Fuel system flush circuitry and method for operating the same
DE102016218710A1 (en) * 2016-09-28 2018-03-29 Bayerische Motoren Werke Aktiengesellschaft Method for emptying an exhaust aftertreatment device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014014399A1 (en) * 2012-07-05 2014-01-23 Scania Cv Ab Method pertaining to an scr system and an scr system.
US20140360168A1 (en) * 2013-06-07 2014-12-11 Jeffrey Michael Broderick System and Method for Sequential Injection of Reagent to Reduce NOx from Combustion Sources
DE102014201816A1 (en) * 2014-01-31 2015-06-18 Mtu Friedrichshafen Gmbh System for dosing of reducing agent in an exhaust device of an internal combustion engine and internal combustion engine

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Publication number Publication date
GB2560374B (en) 2019-08-14
WO2018162508A1 (en) 2018-09-13
GB201703855D0 (en) 2017-04-26

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