CN109958512A - Exhaust-gas treatment system for engine - Google Patents
Exhaust-gas treatment system for engine Download PDFInfo
- Publication number
- CN109958512A CN109958512A CN201811525363.1A CN201811525363A CN109958512A CN 109958512 A CN109958512 A CN 109958512A CN 201811525363 A CN201811525363 A CN 201811525363A CN 109958512 A CN109958512 A CN 109958512A
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- Prior art keywords
- injector
- baffle
- exhaust
- treatment system
- exhaust pipe
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
- B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector mixers
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- 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
- F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
- F01N3/108—Auxiliary reduction catalysts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9413—Processes characterised by a specific catalyst
- B01D53/9418—Processes characterised by a specific catalyst for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/21—Mixing gases with liquids by introducing liquids into gaseous media
- B01F23/213—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
- B01F23/2132—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids using nozzles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
- B01F25/23—Mixing by intersecting jets
- B01F25/231—Mixing by intersecting jets the intersecting jets having the configuration of sheets, cylinders or cones
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
- B01F25/4316—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/40—Static mixers
- B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
- B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
- B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
- B01F25/43197—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor characterised by the mounting of the baffles or obstructions
- B01F25/431974—Support members, e.g. tubular collars, with projecting baffles fitted inside the mixing tube or adjacent to the inner wall
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- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series
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- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series
- F01N13/0097—Exhaust or silencing apparatus characterised by constructional features having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
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- 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
- F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
- F01N3/2066—Selective catalytic reduction [SCR]
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- 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
- F01N3/24—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 constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/12—Methods and means for introducing reactants
- B01D2259/124—Liquid reactants
-
- 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
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- 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
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
-
- 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)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Toxicology (AREA)
- Dispersion Chemistry (AREA)
- Biomedical Technology (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Materials Engineering (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
A kind of exhaust-gas treatment system for engine includes exhaust pipe, baffle and injector.Exhaust pipe receives the discharge gas from engine.Baffle plate setting is in exhaust pipe.Baffle is oriented with the first angle of the central longitudinal axis relative to exhaust pipe, a part of discharge gas is directed towards injector ledge along baffle on downstream direction.Baffle includes multiple openings, in order to the discharge gas Uniform Flow in baffle downstream.Injector is mounted in injector ledge, and is oriented with the second angle of the central longitudinal axis relative to exhaust pipe along downstream direction, and reducing agent is transported in discharge gas.First angle is acute angle and second angle is obtuse angle.
Description
Technical field
The present invention relates to a kind of exhaust-gas treatment systems for engine.More particularly, it relates to a kind of for having
There is the exhaust-gas treatment system of the engine of reducing agent catalyst converter.
Background technique
Before discharge gas is discharged into atmosphere, exhaust-gas treatment system is released commonly used in processing and removal from engine
The various pollutants in discharge gas put.Exhaust-gas treatment system as a kind of uses the reducing agent of such as urea and for example selects
Selecting property catalysis reduction (SCR) catalyst Exhaust treating catalyst device, in order to from discharge gas remove pollutant (such as
NOx).In this case, reducing agent is frequently injected into the exhaust gas flow of catalyst converter upstream.Reducing agent is by exhaust
It is reacted with discharge gas while managing catalyst converter and converts non-polluting object ingredient for various pollutants.For example, urea is urged in SCR
It is reacted in the presence of agent with the NOx being present in discharge gas, and is nitrogen and water by NOx conversion.In order to effectively from discharge
Pollutant is removed in gas, reducing agent is needed appropriate with discharge gas and equably mixed.
U.S. Patent No. 8,621,846 are related to a kind of exhaust-gas treatment system for internal combustion engine.Exhaust-gas treatment system packet
Exhaust fluid injector is included, exhaust fluid is transported to discharge gas in the upstream direction.In addition, exhaust-gas treatment system includes
Exhaust stream baffle positioned at exhaust fluid injector upstream.Exhaust stream baffle is limited downstream and close to exhaust fluid injector
Determine the low pressure velocity field of turbulent flow.
Summary of the invention
According on one side, a kind of exhaust-gas treatment system for engine is disclosed.Exhaust-gas treatment system includes exhaust
Pipeline, baffle and injector.Exhaust pipe receives the discharge gas from engine.Baffle plate setting is in exhaust pipe.Baffle
It is oriented with the first angle of the central longitudinal axis relative to exhaust pipe, by a part on downstream direction along baffle
Discharge gas is directed towards injector ledge.Baffle includes multiple openings, in order to the discharge gas Uniform Flow in baffle downstream.
Injector is mounted in injector ledge, and with the second angle of the central longitudinal axis relative to exhaust pipe with downstream side
To orientation, reducing agent is transported in discharge gas.First angle is acute angle and second angle is obtuse angle.
A kind of exhaust-gas treatment system for engine is disclosed according to another aspect,.Exhaust-gas treatment system includes being used for
Receive exhaust pipe, baffle, injector, static mixer and the reducing agent catalyst converter of the discharge gas from engine.Baffle
It is arranged in exhaust pipe, and with the first angle of the central longitudinal axis relative to exhaust pipe orientation, it will be in downstream
Injector ledge is directed towards along a part of discharge gas of baffle on direction.Baffle includes multiple openings, in order to baffle
The discharge gas Uniform Flow in downstream.In addition, injector is mounted in injector ledge, and relative in exhaust pipe
The second angle of heart longitudinal axis is oriented with downstream direction, and reducing agent is transported in discharge gas.Static mixer setting
In the exhaust pipe in injector downstream.Static mixer includes multiple blades, in order to the mixing of reducing agent and discharge gas.
In addition, reducing agent catalyst converter is arranged in the exhaust pipe in static mixer downstream, in order to restore the nitrogen in discharge gas
Oxide.First angle is acute angle and second angle is obtuse angle.
Detailed description of the invention
Fig. 1 shows the exemplary exhaust treatment system for engine of embodiment according to the present invention；
Fig. 2 shows the amplification sectional views of the exhaust-gas treatment system of embodiment according to the present invention；
Fig. 3 shows the magnification fluoroscopy sectional view of the exhaust-gas treatment system of embodiment according to the present invention, and which depict rows
The baffle of gas processing system towards upstream face；
Fig. 4 shows the magnification fluoroscopy sectional view of the exhaust-gas treatment system of embodiment according to the present invention, and which depict rows
The surface for the downstream of the baffle of gas processing system；And
Fig. 5 shows the perspective view of the baffle of the exhaust-gas treatment system of embodiment according to the present invention.
Specific embodiment
Fig. 1 shows the exemplary exhaust treatment system 100 for engine 102.Engine 102 can be internal-combustion engine
Machine, such as diesel engine.Although it is contemplated that diesel engine, but it is understood that, exhaust-gas treatment system 100 can with such as
Under other kinds of engine be used together: such as, but not limited to petrol engine, dual fuel engine, homogeneous-charge compression point
Fiery engine and any other similar engine.It for ease of description and discusses, will be begged under the background of diesel engine
By the present invention.Exhaust-gas treatment system 100 is configured to before the discharge gas received from engine 102 is discharged into the atmosphere
Manage discharge gas.In one embodiment, exhaust-gas treatment system 100 is selective catalytic reduction system operating 104, and be configured to by
Nitrogen oxides present in discharge gas (NOx) is reduced into nitrogen and water.
Referring to Fig.1, Fig. 2, Fig. 3 and Fig. 4, exhaust-gas treatment system 100 include exhaust pipe 106, baffle 108, injector
110, mixer 112 and reducing agent catalyst converter 114.Exhaust pipe 106 is connected to engine 102, and is configured to receive from hair
The discharge gas that motivation 102 is discharged.Exhaust pipe 106 facilitates the discharge gas discharged by engine 102 flowing to environment.Gear
Plate 108 is arranged in exhaust pipe 106, and with the first angle of the central longitudinal axis 118 relative to exhaust pipe 106
' A ' orientation (as shown in Figure 2).Baffle 108 is configured to facilitate the discharge gas Uniform Flow in 108 downstream of baffle.Baffle 108
Details will discuss in the description below.Along the direction of exhaust gas flow, mixer 112 be can be set in baffle 108 and spray
In the exhaust pipe 106 in 110 downstream of emitter.It is uniform that mixer 112 can be used for facilitating the reducing agent sprayed by injector 110
It is mixed into discharge gas.In one embodiment, mixer 112 is (as shown in Figure 1, Figure 2, Fig. 3 the and Fig. 4 institute of static mixer 116
Show).Static mixer 116 may include multiple blades 120 and multiple openings 122 for being limited between multiple blades 120, to have
The appropriate atomization and reducing agent for helping reducing agent are uniformly mixed into discharge gas.In one embodiment, mixer 112 can be with
Discharge gas eddy flow is generated, in order to which reducing agent is uniformly mixed into discharge gas.In addition, the setting of reducing agent catalyst converter 114 exists
Downstream in exhaust pipe 106 and positioned at mixer 112.Reducing agent catalyst converter 114 is configured to promote to reduce by reducing agent to arrange
Pollutant present in deflation body.In one embodiment, reducing agent can be diesel exhaust fluid, such as ammonia, urea etc..
In this case, reducing agent catalyst converter 114 facilitates (such as the nitrogen oxides of nitrogen oxide present in discharge gas
(NOx)) nitrogen and water are reduced into.
Injector 110 is mounted in injector ledge 126, injector ledge 126 can be formed in exhaust pipe 106 or
Such as it is attached to thereon by welding etc..Injector ledge 126 may include injector mounting flange 130 (in Fig. 2, Fig. 3 and figure
In 4 best seen from) to install injector 110.The tip portion 134 of injector 110 projects through injector mounting flange 130 simultaneously
And it can extend towards exhaust pipe 106.In certain embodiments, the outermost end of tip portion 134 can be not extended past spray
The inner surface of emitter mounting flange 130.The orientation of the configuration of injector ledge 126 and injector mounting flange 130 cooperate so that
Injector 110 orients in a manner of for the downstream, so that the axis 136 of injector 110 is in relative in exhaust pipe 106
The second angle ' B ' (Fig. 2) of heart longitudinal axis 118.Therefore, injector 110 is with the center longitudinal axis relative to exhaust pipe 106
The second angle ' B ' of line 118 is oriented with downstream direction.In one embodiment, the axis 136 of injector 110 is relative to exhaust
The normal 138 of the central longitudinal axis 118 of pipeline 106 is in third angle ' C '.In one embodiment, second angle ' B ' is
Obtuse angle, and third angle ' C ' is acute angle.Injector 110 orients in a manner of as follows: so that injector 110 is in downstream side
Reducing agent is conveyed towards mixer 112 or reducing agent catalyst converter 114 upwards.Third angle C can be from about 40 ° to about 70 °
In the range of, this depends on discharge characteristic, such as the flow and speed of discharge gas.
In addition, injector ledge 126 can limit room 140, for receiving a part discharge gas for flowing through exhaust pipe 106
Body.Moreover, tip portion 134 (injector 110) extends in room 140.In one embodiment, tip portion 134 can
To be not extended past the inner surface of injector mounting flange 130.Room 140 can be by being limited to baffle 108 and injector ledge
Receive a part of discharge gas in gap 142 between 126.As shown in Figure 1, Figure 2, Figure 3 and Figure 4, gap 142 can be limited to spray
Between emitter mounting flange 130 and baffle 108.Before leaving injector ledge 126, a part of discharge gas is along injector
The profile of ledge 126.Due to orientation (first angle ' A ') of the baffle 108 in exhaust pipe 106, a part of discharge gas is logical
It crosses baffle 108 and room 140 (injector ledge 126) is directed by gap 142.
Baffle 108 is oriented in exhaust pipe 106 in a manner of as follows, so that baffle 108 will be on downstream direction
Injector ledge 126 is directed towards along a part of discharge gas of baffle 108.Baffle 108 can from injector ledge 126 to
It extends in exhaust pipe 106 outside, and central longitudinal axis can be extended upwardly past in the party upstream far from mixer 112
118。
Referring to figs. 1 to Fig. 5, baffle 108 can be slab structure, and may include outer periphery 150, from outer periphery 150
Outwardly extending multiple lugs 152, towards upstream face 154, for the downstream surface 158 (as shown in Figure 4) and multiple open
Mouth 160.In one embodiment, baffle 108 can be the form of elliptical flat-plate.Although baffle 108 is envisioned for elliptical flat-plate,
But baffle 108 can be the form of the plate (such as circular slab) of any other analogous shape.Multiple openings 160 facilitate baffle
The discharge gas Uniform Flow in 108 downstreams.Multiple openings 160 are extended to by the width of baffle 108 from towards upstream face 154
Surface 158 for the downstream.Therefore, baffle 108 allows at least part discharge gas to pass through multiple openings 160 from baffle 108
Upstream flow to the downstream of baffle 108.In some implementations, it is provided closer to the width of the opening 160 of outer periphery 150
Greater than the distal side that outer periphery 150 is arranged in and closer to the width of the opening at the center of baffle 108 160.The difference of opening 160
Width can contribute to the downstream in baffle 108 and realize that discharge gas is uniformly distributed along the width of exhaust pipe 106.
By coupling multiple lugs 152 with the wall 162 of exhaust pipe 106, baffle 108 can support or be mounted on exhaust
In pipeline 106.Multiple lugs 152 can be connected to by welding, fastening or any other suitable method known in the art
Exhaust pipe 106.Baffle 108 is supported in exhaust pipe 106 so that first angle ' A ' be limited to surface 158 for the downstream or
Towards between upstream face 154 and central longitudinal axis 118.In addition, baffle 108 is also vertical to be orientated relative to exhaust pipe
The fourth angle ' D ' of axis 164 orients.First angle A is acute angle, and can be in the range of from about 30 ° to about 80 °, this
Flow and speed depending on discharge characteristic, such as discharge gas.In one embodiment, first angle ' A ' is based on second jiao
It spends ' B ', that is, baffle 108 depends on injector 110 relative to central longitudinal axis relative to the orientation of central longitudinal axis 118
118 orientation or with the change in orientation.First angle ' A ' can change with second angle ' B ', in order to pass through gap
142 make a part of discharge gas enter injector ledge 126.It is appreciated that selection second angle ' B ' makes by injector 110
The reducing agent impingement mix device 112 of injection interacts with mixer 112.In addition, as shown in figure 4, baffle 108 can couple
To exhaust pipe 106, to limit one or more circular passages 166 between the wall 162 and outer periphery 150 of exhaust pipe 106.
In one embodiment, multiple openings 160 can contribute to discharge gas along row with one or more circular passages 166 together
The even width of feed channel 106 is distributed.
Baffle 108 can also include 168 (the hereinafter referred to first end of end that 126 nearside of injector ledge is arranged in
168) the second end 170 and far from injector ledge 126 being arranged.First end 168 and injector ledge 126 limit together
The gap 142 between them is determined, by the gap 142, a part of discharge gas, which is guided into, to be entered the room in 140 and therefore enter
In injector ledge 126.In addition, first end 168 may include notch 174, to be mentioned for the reducing agent that is discharged by injector 110
For channel.Notch 174 can be limited along the outer periphery of baffle 108 150, and can form opening 176, to allow by injector
In a part for the exhaust pipe 106 that the reducing agent of 110 discharges enters 108 downstream of baffle.In one embodiment, notch 174
U-shaped opening can be formed along outer periphery 150 at first end 168.
Baffle 108 can also include one or more directing plates 180, in the upstream direction from towards upstream face 154
Extend outwardly.Each directing plate 180 includes far from the free end 182 being arranged towards upstream face 154 and being connected to first end
The connecting pin 184 in portion 168.In addition, the nearside of the central longitudinal axis 118 of exhaust pipe 106 is arranged in free end 182, and
The distal side of the centrally disposed longitudinal axis 118 in connecting pin 184.In addition, free end 182 can be set in the distal side of notch 174, and
The nearside in notch 174 can be set in connecting pin 184.In this way, each directing plate 180 may be located remotely from towards upstream face
154 extend, and can be with the 5th angle ' E ' orientation towards upstream face 154 relative to baffle 108.Therefore, Mei Geyin
Guide plate 180 can limit angle (hexagonal degree ' F ') relative to the central longitudinal axis 118 of exhaust pipe 106.Implement at one
In example, hexagonal degree ' F ' can be equal to first angle ' A '.Baffle 108 is arranged in exhaust pipe 106, so that each directing plate
The upstream towards upstream face 154 is arranged in 180 free end 182.Each directing plate 180 in exhaust pipe 106 it is this
Arrangement and each directing plate 180 can help to guide a part of discharge gas relative to the orientation towards upstream face 154
It is directed in injector ledge 126 into room 140 and therefore through gap 142.Although it is contemplated that one or more directing plates
180, but it is understood that, it is convenient to omit directing plate 180, and in this case, baffle 108 is relative to center longitudinal direction
Axis 118 tilts a part of discharge gas helped guide inside room 140 and passes through gap 142.Entered by gap 142 and is sprayed
A part of discharge gas of device ledge 126 can be convex along injector before the injector ledge 126 for leaving 108 downstream of baffle
The profile of frame 126.
Industrial applicibility
During operation, exhaust pipe is entered by the entrance of exhaust pipe 106 from the discharge gas that engine 102 discharges
106.When discharge gas is advanced through exhaust pipe 106, discharge gas is contacted with baffle 108.A part of discharge gas passes through
Multiple openings 160 simultaneously pass through circular passage 166, and rest part is deflected and drawing towards upstream face 154 along baffle 108
It leads.Once leaving opening 160 (i.e. the downstream of baffle 108) by a part of discharge gas of multiple openings 160, then a part
Flowing just become uniform.It is equal that this Uniform Flow means that a part of discharge gas is presented along the width of exhaust pipe 106
The flowing of even distribution, rather than concentrated along any any fluid flow line (such as along central longitudinal axis 118).Along baffle
The discharge gas of 108 remainder for deflecting and guiding towards upstream face 154 enters injector ledge by gap 142
126.In addition, directing plate 180, which may also help in, is directed towards injector ledge by gap 142 for the discharge gas of remainder
126.A part of discharge gas being contained in room 140 is flowed along the profile of injector ledge 126.
When the profile flowing along injector ledge 126, discharge gas connects with the reducing agent sprayed by injector 110
Touching, and reducing agent can be carried secretly, to help to cause reducing agent atomization process.Hereafter, at least partly load has reducing agent
A part of discharge gas a part of discharge gas for leaving room 140 and passing through the opening 160 of baffle 108 back to downstream.Stream
It crosses room 140 and a part of discharge gas for therefore flowing through injector ledge 126 prevents reducing agent in 126 inner product of injector ledge
Poly- and deposition.Moreover, being projected into room 140 with the tip portion 134 of injector 110 and therefore entering injector ledge
126, a part of discharge gas flowed into room 140 can be with heated tip part 134.The tip portion 134 of injector 110 adds
The flowing of discharge gas around heat and tip portion 134 can avoid or reduce reducing agent in the aperture of injector 110 and/or
The deposition and condensation of emitting unacceptable amount in flow channel, so that it is guaranteed that the normal operating of injector 110.
Claims (20)
1. a kind of exhaust-gas treatment system for engine, the exhaust-gas treatment system include:
Exhaust pipe, for receiving the discharge gas from the engine；
Baffle in the exhaust pipe is set, wherein the baffle is with the center longitudinal axis relative to the exhaust pipe
The first angle of line orients, and it is convex that a part of discharge gas on downstream direction along the baffle is directed towards injector
Frame, the baffle include multiple openings, to facilitate the discharge gas Uniform Flow in the baffle downstream；And
The injector being mounted in the injector ledge, the injector is on the downstream direction relative to the exhaust
The second angle of the central longitudinal axis of pipeline orients, and reducing agent is transported in discharge gas,
Wherein, the first angle is acute angle and the second angle is obtuse angle.
2. exhaust-gas treatment system according to claim 1 further includes static mixer, the static mixer is arranged in institute
It states in injector and the exhaust pipe in the baffle downstream, the static mixer includes multiple blades, to facilitate
State the mixing of reducing agent and discharge gas.
3. exhaust-gas treatment system according to claim 2 further includes the row that the static mixer downstream is arranged in
Reducing agent catalyst converter in feed channel.
4. exhaust-gas treatment system according to claim 1, wherein the injector ledge is limited for receiving discharge gas
Room, the injector ledge includes the injector mounting flange for installing the injector, wherein the injector extends
Into the room.
5. exhaust-gas treatment system according to claim 2, wherein the baffle is extended outwardly into from the injector ledge
The central longitudinal axis is extended upwardly beyond in the exhaust pipe and in the party upstream far from the static mixer.
6. exhaust-gas treatment system according to claim 1, wherein the baffle includes that setting is close in the injector ledge
The end of side defines gap between the end and the injector ledge, wherein the baffle will be in the downstream direction
On along a part of discharge gas guidance of the baffle by the gap into the injector ledge.
7. exhaust-gas treatment system according to claim 6, wherein the end includes the periphery margin along the baffle
Fixed notch, the reducing agent that the notch provides for being discharged by the injector enter the channel in the exhaust pipe.
8. exhaust-gas treatment system according to claim 6, wherein the baffle includes the baffle towards upstream face
It further include one or more directing plates, one or more of directing plates are outside towards upstream face from described in the upstream direction
Extend so that a part of discharge gas is directed towards the gap.
9. exhaust-gas treatment system according to claim 8, wherein one or more of directing plates are in the updrift side
On surface is oriented with the angle of the central longitudinal axis relative to the exhaust pipe from the upstream face.
10. exhaust-gas treatment system according to claim 1, wherein the baffle includes multiple lugs, the multiple lug
The exhaust pipe is adapted for couple to so that the baffle to be mounted in the exhaust pipe.
11. exhaust-gas treatment system according to claim 1, wherein the first angle be based on the injector relative to
The second angle of the central longitudinal axis.
12. a kind of exhaust-gas treatment system for engine, the exhaust-gas treatment system include:
Exhaust pipe, for receiving the discharge gas from the engine；
Baffle in the exhaust pipe is set, and the baffle is with of the central longitudinal axis relative to the exhaust pipe
One angle orientation, is directed towards injector ledge for a part of discharge gas on downstream direction along the baffle, institute
Stating baffle includes multiple openings to facilitate the discharge gas Uniform Flow in the baffle downstream；
The injector being mounted in the injector ledge, the injector is on the downstream direction relative to the exhaust
The second angle of the central longitudinal axis of pipeline orients, and reducing agent is transported in discharge gas；
Static mixer, the static mixer are arranged in the exhaust pipe in the injector downstream, described static mixed
Clutch includes multiple blades, to facilitate the mixing of the reducing agent and discharge gas；And
Reducing agent catalyst converter in the exhaust pipe in the static mixer downstream is set, to facilitate reduction discharge gas
Nitrogen oxide in body,
Wherein, the first angle is acute angle and the second angle is obtuse angle.
13. exhaust-gas treatment system according to claim 12, wherein the injector ledge is limited for receiving discharge gas
The room of body, the injector ledge include the injector mounting flange for installing the injector, wherein the injector prolongs
It reaches in the room.
14. exhaust-gas treatment system according to claim 12, wherein the baffle extends outwardly from the injector ledge
The central longitudinal axis is extended upwardly beyond into the exhaust pipe and in the party upstream far from the static mixer.
15. exhaust-gas treatment system according to claim 12, wherein the baffle includes being arranged in the injector ledge
The end of nearside defines gap between the end and the injector ledge, wherein the baffle will be in the downstream side
The injector ledge is entered by the gap along a part of discharge gas guidance of the baffle upwards.
16. exhaust-gas treatment system according to claim 15, wherein the end includes the periphery margin along the baffle
Fixed notch, the reducing agent that the notch provides for being discharged by the injector enter logical in the exhaust pipe
Road.
17. exhaust-gas treatment system according to claim 15, wherein the baffle includes the gear towards upstream face
Plate further includes one or more directing plates, one or more of directing plates in the upstream direction from it is described towards upstream face to
Outer extension is to be directed towards the gap for a part of discharge gas.
18. exhaust-gas treatment system according to claim 17, wherein one or more of directing plates are in the party upstream
Surface is oriented with the angle of the central longitudinal axis relative to the exhaust pipe from the upstream face upwards.
19. exhaust-gas treatment system according to claim 12, wherein the baffle includes multiple lugs, the multiple convex
Ear is adapted for couple to the exhaust pipe so that the baffle to be mounted in the exhaust pipe.
20. exhaust-gas treatment system according to claim 12, wherein the first angle be based on the injector relative to
The second angle of the central longitudinal axis.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1720814.1 | 2017-12-14 | ||
| GB1720814.1A GB2569339B (en) | 2017-12-14 | 2017-12-14 | Exhaust treatment system for an engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109958512A true CN109958512A (en) | 2019-07-02 |
| CN109958512B CN109958512B (en) | 2022-08-02 |
Family
ID=61008726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811525363.1A Active CN109958512B (en) | 2017-12-14 | 2018-12-13 | Exhaust treatment system for engine |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109958512B (en) |
| GB (1) | GB2569339B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112576345A (en) * | 2019-09-27 | 2021-03-30 | 佛吉亚排放控制技术美国有限公司 | Decomposition tube for heated dosing device |
| JP2023084259A (en) * | 2021-12-07 | 2023-06-19 | 株式会社豊田自動織機 | Exhaust purification device |
| WO2023115905A1 (en) * | 2021-12-22 | 2023-06-29 | 潍柴动力股份有限公司 | Scr mixer and vehicle |
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| WO2023115905A1 (en) * | 2021-12-22 | 2023-06-29 | 潍柴动力股份有限公司 | Scr mixer and vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2569339A (en) | 2019-06-19 |
| GB2569339B (en) | 2020-10-14 |
| CN109958512B (en) | 2022-08-02 |
| GB201720814D0 (en) | 2018-01-31 |
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