WO2013117230A1 - Injecteur d'agent de réduction - Google Patents
Injecteur d'agent de réduction Download PDFInfo
- Publication number
- WO2013117230A1 WO2013117230A1 PCT/EP2012/052242 EP2012052242W WO2013117230A1 WO 2013117230 A1 WO2013117230 A1 WO 2013117230A1 EP 2012052242 W EP2012052242 W EP 2012052242W WO 2013117230 A1 WO2013117230 A1 WO 2013117230A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- injector
- internal combustion
- combustion engine
- exhaust pipe
- exhaust
- Prior art date
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
- 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
- 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
Definitions
- the disclosure relates to an injector for injecting a NO x reduction agent upstream of a NO x reduction catalyst in an exhaust pipe.
- BACKGROUND Combustion of various fuels using air as fuel oxidizer can emit various polluting side-products.
- air oxygen may react with air nitrogen to produce various nitrogen oxides, generically known as NO x .
- NO x nitrogen oxides
- high combustion temperatures are generally advantageous to improve the energy efficiency of thermodynamic cycles, in particular in internal combustion engines, the resulting emissions of NO x in exhaust fumes have generally negative effects.
- exhaust NO x can react with atmospheric moisture to produce nitric acid, which can then precipitate as acid rain. Its photochemistry also promotes the generation of ozone in the lower atmospheric layers, where it is usually harmful, and its destruction in the upper atmospheric layers, where ozone filters harmful ultraviolet radiation.
- SCR selective catalytic reduction
- a catalyst promotes the reduction of NO x by a gaseous reduction agent, such as ammonia or urea, to produce nitrogen and water.
- a gaseous reduction agent such as ammonia or urea
- a first object of the disclosure is that of providing a compact and robust injector capable nevertheless of ensuring a thorough mixing of the injected reducing agent with the exhaust fumes within a short length of the exhaust pipes.
- such an injector for injecting a NO x reduction agent upstream of a NO x reduction catalyst in an exhaust pipe comprises at least one bent duct with a plurality of outlet orifices distributed over its length.
- this injector with the bent tube installed transversally to the exhaust pipe, can distribute the reducing agent across the cross-section of the exhaust pipe, thus facilitating, within a short length of the exhaust pipe, a thorough mixing of the reducing agent with the flow of exhaust fumes through the exhaust pipe.
- said bent duct may be a serpentine duct with successive bends in alternate directions.
- said bends may be adapted to be fixed to an inner surface of the exhaust pipe, for example by welding, brazing or soldering.
- Such a serpentine shape can further enhance the distribution of the NO x reduction agent across the exhaust flow.
- the attachment of the bends to the inner wall of the exhaust pipe reinforces the injector against vibrations such as those produced by an internal combustion engine.
- said bent duct may be bent in a different shape, such as that of a spiral duct, which also allow a distribution of the outlet orifices across the cross-section of the exhaust pipe.
- said outlet orifices may be substantially oriented in a downstream direction of the exhaust pipe segment.
- the orientation of the outlet orifices may not diverge from the downstream direction by more than 15°, and preferably may not diverge by more than 5°. With this orientation, clogging of the outlet orifices by soot and other particles carried by the exhaust fumes can be substantially avoided.
- aid outlet orifices may have a plurality of different diameters, in order to optimize the distribution of the ⁇ reduction agent across the exhaust flow.
- said reduction agent may comprise gaseous ammonia, which disperses easily in the exhaust fumes and effectively reduces NO x in the subsequent selective catalytic reduction without leaving substantial side-products.
- Another object of the disclosure is that of providing a robust, compact and efficient internal combustion engine exhaust treatment unit comprising at least an exhaust pipe with a NO x reduction catalyst.
- said internal combustion engine exhaust treatment unit may further comprise the abovementioned injector upstream of said NO x reduction catalyst.
- exhaust fumes may also include additional pollutants.
- said internal combustion engine exhaust treatment unit may comprise a combined selective catalytic reduction and particle filter unit including said NO x reduction catalyst.
- SCR-PF selective catalytic reduction and particle filter
- exhaust fumes may also include additional pollutants resulting from an incomplete combustion, such as carbon monoxide and volatile hydrocarbons. Consequently, according to an eighth aspect of the present disclosure, said internal combustion engine exhaust treatment unit may further comprise an oxidation catalyst located within the exhaust pipe, upstream of said injector, in order to prevent or at least reduce the emissions of such additional pollutants. Since at least part of the soot and other fine particles may also be burnt in this oxidation catalyst, its upstream location has also the advantage of reducing the risk of clogging of the outlet orifices of said injector by fine particles carried by the exhaust fumes.
- the present disclosure also relates to an internal combustion engine comprising the abovementioned internal combustion engine exhaust treatment unit.
- said internal combustion engine may be a Diesel engine.
- it may alternatively be any other sort of internal combustion engine, such as, for example, an Otto engine.
- said internal combustion engine may further comprise a turbocharger with a turbine located upstream of said internal combustion engine exhaust treatment unit.
- the upstream location of the turbine prevents pressure losses at the turbine inlet.
- FIG. 1 is a schematic view of an internal combustion engine and exhaust treatment unit according to a first embodiment
- FIG. 2 is a back view of a reduction agent injector of the exhaust treatment unit of FIG. 1;
- FIG. 3 is a detail cut view of a duct of the injector of FIG. 2;
- FIGS. 4A to 4C are back views of reduction agent injectors according to several alternative embodiments.
- Engine 1 Internal combustion engine 1, which will henceforth be referred to as “engine 1”, is a Diesel engine comprising at least one combustion chamber 2 defined by a piston 3, a cylinder 4 and a cylinder head 5.
- Engine 1 also includes a fuel injector 6 for injecting fuel directly into the combustion chamber 2, an inlet 7 and an outlet 8 in the cylinder head 5, as well as inlet and outlet valves 9, 10 for opening and closing said inlet 7 and outlet 8.
- the fuel injector 6 is connected to a fuel supply system (not illustrated).
- An airflow sensor 11 is integrated in the inlet 7.
- air enters in the combustion chamber 2 through the inlet 7 is mixed within the combustion chamber 2 with fuel injected into the combustion chamber 2 by the fuel injector 6, and the resulting air/fuel mixture is ignited within the combustion chamber 2 by the compression heat during a compression stroke of the piston 3.
- the combustion of the air/fuel mixture drives an expansion stroke of the piston 3 and the resulting combustion gases leave the combustion chamber 2 as exhaust fumes through the outlet 8.
- the engine 1 also comprises a turbocharger 12 including a compressor 12a located upstream of the inlet 7 and a turbine 12b located downstream of the outlet 8. Said compressor 12a and turbine 12b are coupled by a common shaft 12c, so that the expansion of exhaust fumes in the turbine 12b drives the compression on inlet air in the compressor 12a. By increasing the inlet pressure in the combustion chamber 2, the turbocharger 12 can increase the power output and efficiency of the engine 1.
- the engine 1 further comprises, downstream of the turbine 12a, an exhaust treatment unit 13 comprising an exhaust pipe 14 and, within that exhaust pipe 14, an oxidation catalyst 15, a reduction agent injector 16 and a combined selective catalytic reduction and particle filter unit 17, henceforth referred to as "SCR-PF 17".
- the exhaust pipe 14 ends in a silencer 18.
- the exhaust treatment unit 13 also comprises a NOx sensor 19, an exhaust pressure sensor 20 and an exhaust temperature sensor 21 located between the turbine 12b and the oxidation catalyst 15, as well as a reduction agent concentration sensor 22 located downstream of the SCR-PF 17.
- the reduction agent injector 16 is connected to a reduction agent supply device 23, such as that described in detail in French patent application publication FR 2 816 986, that can supply the reduction agent injector 16 with gaseous ammonia as a reduction agent.
- Sensors 11, 19, 20 and 21 are connected to an engine electronic control unit 24, henceforth referred to as ECU 24, which is also connected to the fuel injector 6 and reduction agent supply device 23, as well as to command input devices such as a throttle pedal (not illustrated) in order to command operation of the engine 1 and exhaust treatment unit 13 in response to user commands and operation parameters.
- ECU 24 engine electronic control unit 24, henceforth referred to as ECU 24, which is also connected to the fuel injector 6 and reduction agent supply device 23, as well as to command input devices such as a throttle pedal (not illustrated) in order to command operation of the engine 1 and exhaust treatment unit 13 in response to user commands and operation parameters.
- the reduction agent injector 16 is illustrated in more detail in FIGS. 2 and 3. It comprises a serpentine duct: 25 presenting successive bends 26 in alternate directions.
- the serpentine duct 25 is oriented transversally to the exhaust pipe 14 and said bends 26 are brazed to an inner surface 27 of the exhaust pipe segment 24 so as to rigidly support the serpentine duct 25 in the exhaust pipe segment 24.
- the serpentine duct 25 traverses the wall of the exhaust pipe segment 24 and is open so as to form a reduction agent inlet connectable to the reduction agent supply device 23.
- the opposite end 29 of the serpentine duct 25 is closed.
- the reduction agent injector 16 presents a plurality of outlet orifices 30 distributed over the whole cross-section of the exhaust pipe segment 24. As illustrated in FIG. 3, these outlet orifices 30, oriented in the downstream direction, ensure the injection of the reduction agent in the exhaust: flow. Since the outlet orifices 30 are distributed transversally in the exhaust pipe segment 24, this injection can ensure a thorough mixing of the reduction agent and the exhaust fumes within a very short distance in the downstream direction before reaching the SCR-PF 17, without an additional gas mixer. In order to optimise the distribution of reduction agent in the exhaust flow, the diameter of each outlet orifice 30 may be different. The pitch between individual outlet orifices 30 may also be adapted to that purpose.
- FIGS. 4A to 4C Alternative embodiments of the reduction agent injector 16 are illustrated in FIGS. 4A to 4C.
- the bent duct 25' is a spiral duct.
- the multiple coils of this spiral duct 25' are brazed to a crossbar 50 whose two opposite ends 50a, 50b are in turn brazed to the inner surface 27 of the exhaust pipe segment 24.
- the bent duct 25" has three successive bends 26" in the same direction, giving it a triangular shape. As in the first embodiment, these bends 26" are brazed to the inner surface 27 of the exhaust pipe segment 24.
- the reduction agent injector 16 may also comprise more than one such bent duct.
- the reduction agent injector 16 comprises two serpentine ducts 25, arranged closely behind each other in the flow direction within the exhaust pipe segment 24.
- the bends 26 of each serpentine duct 25 are brazed to an inner surface 27 of the exhaust pipe segment 24.
- the bent duct or ducts also present a plurality of outlet orifices 30 distributed over the whole cross-section of the exhaust pipe segment 24 and oriented in the downstream direction.
- the exhaust fumes exiting the turbine 12b enter the exhaust treatment unit 13, where they reach the oxidation catalyst 15.
- the oxidation catalyst 15 such products of partial combustion of the fuel/air mixture in the combustion chamber 2 as carbon monoxide, hydrocarbons and some solid particles are further oxidized by the remaining oxygen.
- the partially depolluted exhaust fumes then reach reduction agent injector 16 where they are mixed with the gaseous reduction agent supplied by the reduction agent supply device 23, commanded by the ECU 24, through said reduction agent injector 16.
- the mixture of exhaust fumes and gaseous reduction agent flows to the SCR-PF 17, where the NO x reduction catalyst accelerates the reaction between the reduction agent and the NO x in the exhaust fumes, and at least part of the remaining soot and fine particles are blocked and eventually burned.
- the exhaust fumes thus exiting the exhaust treatment unit 13 behind the SCR-PF 17 are substantially depolluted.
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
La présente invention concerne un injecteur (16) permettant d'injecter un agent de réduction de NOx en amont d'un catalyseur de réduction de NOx dans un tuyau d'échappement (14). L'injecteur (16) comprend un segment de tuyau d'échappement (24) et un tuyau coudé (25) avec une pluralité d'orifices de sortie (30).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2012/052242 WO2013117230A1 (fr) | 2012-02-09 | 2012-02-09 | Injecteur d'agent de réduction |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2012/052242 WO2013117230A1 (fr) | 2012-02-09 | 2012-02-09 | Injecteur d'agent de réduction |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2013117230A1 true WO2013117230A1 (fr) | 2013-08-15 |
Family
ID=45755310
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2012/052242 WO2013117230A1 (fr) | 2012-02-09 | 2012-02-09 | Injecteur d'agent de réduction |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2013117230A1 (fr) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20170120193A1 (en) * | 2015-11-04 | 2017-05-04 | Ford Global Technologies, Llc | Methods and systems for a mixer |
US10794252B1 (en) | 2019-04-18 | 2020-10-06 | Faurecia Emissions Control Technologies, Usa, Llc | Direct spray exhaust mixer system |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2816986A1 (fr) | 2000-11-20 | 2002-05-24 | Toyota Motor Co Ltd | Dispositif d'alimentation en agent de reduction pour un moteur a combustion interne |
US6887435B1 (en) | 2000-06-23 | 2005-05-03 | The Babcock & Wilcox Company | Integrated air foil and ammonia injection grid for SCR systems |
US6905658B2 (en) | 2001-06-29 | 2005-06-14 | The Babcock & Wilcox Company | Channelized SCR inlet for improved ammonia injection and efficient NOx control |
US20080141662A1 (en) * | 2006-12-14 | 2008-06-19 | Markus Schuster | Fluid injecting and mixing systems for exhaust after-treatment devices |
EP1975381A1 (fr) * | 2006-01-06 | 2008-10-01 | MITSUI ENGINEERING & SHIPBUILDING CO., LTD | Procede de denitrification de gaz d'echappement et appareil correspondant |
DE102008043726A1 (de) | 2007-11-16 | 2009-05-20 | Denso Corp., Kariya-shi | Abgasreinigungssystem |
WO2011000685A1 (fr) * | 2009-07-01 | 2011-01-06 | Sulzer Chemtech Ag | Dispositif pour le nettoyage de gaz d'échappement contenant des nox |
EP2348204A1 (fr) * | 2010-01-22 | 2011-07-27 | Peugeot Citroën Automobiles SA | Dispositif d'injection de gaz et ligne d'échappement comprenant un tel dispositif |
-
2012
- 2012-02-09 WO PCT/EP2012/052242 patent/WO2013117230A1/fr active Application Filing
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6887435B1 (en) | 2000-06-23 | 2005-05-03 | The Babcock & Wilcox Company | Integrated air foil and ammonia injection grid for SCR systems |
FR2816986A1 (fr) | 2000-11-20 | 2002-05-24 | Toyota Motor Co Ltd | Dispositif d'alimentation en agent de reduction pour un moteur a combustion interne |
US6905658B2 (en) | 2001-06-29 | 2005-06-14 | The Babcock & Wilcox Company | Channelized SCR inlet for improved ammonia injection and efficient NOx control |
EP1975381A1 (fr) * | 2006-01-06 | 2008-10-01 | MITSUI ENGINEERING & SHIPBUILDING CO., LTD | Procede de denitrification de gaz d'echappement et appareil correspondant |
US20080141662A1 (en) * | 2006-12-14 | 2008-06-19 | Markus Schuster | Fluid injecting and mixing systems for exhaust after-treatment devices |
DE102008043726A1 (de) | 2007-11-16 | 2009-05-20 | Denso Corp., Kariya-shi | Abgasreinigungssystem |
WO2011000685A1 (fr) * | 2009-07-01 | 2011-01-06 | Sulzer Chemtech Ag | Dispositif pour le nettoyage de gaz d'échappement contenant des nox |
EP2348204A1 (fr) * | 2010-01-22 | 2011-07-27 | Peugeot Citroën Automobiles SA | Dispositif d'injection de gaz et ligne d'échappement comprenant un tel dispositif |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20170120193A1 (en) * | 2015-11-04 | 2017-05-04 | Ford Global Technologies, Llc | Methods and systems for a mixer |
CN106640289A (zh) * | 2015-11-04 | 2017-05-10 | 福特环球技术公司 | 用于混合器的方法和系统 |
US10040028B2 (en) * | 2015-11-04 | 2018-08-07 | Ford Global Technologies, Llc | Methods and systems for a mixer |
RU2698582C2 (ru) * | 2015-11-04 | 2019-08-28 | Форд Глобал Текнолоджиз, Ллк | Смеситель отработавших газов (варианты) и система для смесителя отработавших газов |
CN106640289B (zh) * | 2015-11-04 | 2021-01-01 | 福特环球技术公司 | 用于混合器的方法和系统 |
US10794252B1 (en) | 2019-04-18 | 2020-10-06 | Faurecia Emissions Control Technologies, Usa, Llc | Direct spray exhaust mixer system |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20100186382A1 (en) | Emissions system mounting device with reductant mixing | |
US8869518B2 (en) | Burner for a diesel aftertreatment system | |
US7971433B2 (en) | Helical exhaust passage | |
US8250857B2 (en) | Exhaust aftertreatment system | |
US20100269492A1 (en) | Diesel aftertreatment system | |
JP5605441B2 (ja) | 排気ガス昇温用バーナー装置 | |
US20170152778A1 (en) | Reductant mixing system for an exhaust gas after-treatment device | |
KR101787333B1 (ko) | 배기 시스템 및 선택적인 촉매 환원을 위한 방법 | |
EP2628913A1 (fr) | Dispositif de dénitration de gaz d'échappement marins | |
CN103210194B (zh) | 用于排气处理装置的入口装置 | |
JP2009156076A (ja) | 内燃機関の排気ガス浄化装置 | |
JP2010019239A (ja) | 排気浄化装置 | |
GB2512896A (en) | A mixer module and an emissions cleaning module | |
JP2009156071A (ja) | 内燃機関の排気ガス浄化装置 | |
US20130125543A1 (en) | Heating apparatus for internal combustion engine exhaust aftertreatment | |
US7805931B2 (en) | Self-sustaining oxy-exothermal filter regeneration system | |
US8220252B2 (en) | Exhaust gas emissions reactor and method of treating exhaust gas | |
KR20170087419A (ko) | 가스 터빈용 결빙-방지 시스템 | |
WO2013117230A1 (fr) | Injecteur d'agent de réduction | |
JP5566283B2 (ja) | 内燃エンジンの排出ラインの酸化触媒に対するターボチャージャの継手 | |
US20140318111A1 (en) | Decomposition tube for an engine | |
JP2010019082A (ja) | 内燃機関の排気浄化システム | |
JP4924834B2 (ja) | 内燃機関の排気ガス浄化装置 | |
US20200102873A1 (en) | Diesel emissions fluid injector mixer | |
US20190040786A1 (en) | Asymmetric catalyst cone for swirl induction of exhaust gas flow |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 12705240 Country of ref document: EP Kind code of ref document: A1 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
122 | Ep: pct application non-entry in european phase |
Ref document number: 12705240 Country of ref document: EP Kind code of ref document: A1 |