CN102933810B - Ring reductant mixer - Google Patents
Ring reductant mixer Download PDFInfo
- Publication number
- CN102933810B CN102933810B CN201180027335.7A CN201180027335A CN102933810B CN 102933810 B CN102933810 B CN 102933810B CN 201180027335 A CN201180027335 A CN 201180027335A CN 102933810 B CN102933810 B CN 102933810B
- Authority
- CN
- China
- Prior art keywords
- ring
- reducing agent
- discharge duct
- engine exhaust
- aftertreatment system
- 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.)
- Expired - Fee Related
Links
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 75
- 238000005507 spraying Methods 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 230000009467 reduction Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000003054 catalyst Substances 0.000 description 26
- 238000002156 mixing Methods 0.000 description 25
- 239000002244 precipitate Substances 0.000 description 17
- 238000000926 separation method Methods 0.000 description 11
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 8
- 238000004140 cleaning Methods 0.000 description 8
- 238000005096 rolling process Methods 0.000 description 8
- 230000008676 import Effects 0.000 description 7
- 238000005183 dynamical system Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000004202 carbamide Substances 0.000 description 4
- 235000013877 carbamide Nutrition 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 241000237509 Patinopecten sp. Species 0.000 description 2
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 235000020637 scallop Nutrition 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 241000256844 Apis mellifera Species 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 244000228957 Ferula foetida Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000004176 ammonification Methods 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- OHJMTUPIZMNBFR-UHFFFAOYSA-N biuret Chemical compound NC(=O)NC(N)=O OHJMTUPIZMNBFR-UHFFFAOYSA-N 0.000 description 1
- 125000006367 bivalent amino carbonyl group Chemical group [H]N([*:1])C([*:2])=O 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- ZFSLODLOARCGLH-UHFFFAOYSA-N isocyanuric acid Chemical compound OC1=NC(O)=NC(O)=N1 ZFSLODLOARCGLH-UHFFFAOYSA-N 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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]
-
- 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
- B01F25/4315—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being deformed flat pieces of material
-
- 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
-
- 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
- B01F25/4318—Ring-shaped blades or strips
-
- 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
- B01F25/431971—Mounted on the wall
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The present invention relates to use the exhaust after treatment system of the reducing agent for NOx reduction technique, engine exhaust aftertreatment system includes the ring being arranged in discharge duct.This ring contributes to the importing of reducing agent and the conversion imported by ejector, the outer surface of described ring is attached to the multiple distance pieces directly contacted with the inwall of described discharge duct, is formed for, between two distance pieces in outer surface, the inwall of described discharge duct and the plurality of distance piece of described ring, the gap that gas flows through.
Description
Technical field
The present invention relates to engine exhaust aftertreatment system, and relate more specifically to use for NOx
The exhaust after treatment system of the reducing agent of reduction technique.
Background technology
SCR can included in the pump-down process or after-treatment system of dynamical system
(SCR) system, to remove or reduction is from the nitrogen oxides (NOx or NO) of engine exhaust
Emission.SCR system uses the reducing agent being imported in gas extraction system, such as carbamide.
United States Patent (USP) US 7,581,387 disclose a kind of include mixed for make that carbamide mixes with exhaust stream
The hybrid system of hing straps.
Summary of the invention
The invention provides a kind of ejector including being configured to import in discharge duct by reducing agent and join
Put the engine exhaust aftertreatment system of ring within an exhaust-gas stream.
Accompanying drawing explanation
Fig. 1 is to include electromotor and the skeleton diagram of dynamical system of the after-treatment system with blender.
Fig. 2 is the front view of blender.
Fig. 3 is the front view of another embodiment of blender.
Fig. 4 is the front view of another embodiment of blender.
Fig. 5 is the front view of another embodiment of blender.
Fig. 6 is the front view of another embodiment of blender.
Fig. 7 is the skeleton diagram of the double branch pipe after-treatment system adding blender.
Detailed description of the invention
As it is shown in figure 1, dynamical system 10 includes electromotor 12 and produces for locating reason electromotor 12
The after-treatment system 14 of exhaust stream 16.Electromotor 12 can include other unshowned feature structures,
Such as controller, fuel system, air system, cooling system, peripheral equipment, powertrain component,
Turbocharger, exhaust gas recycling system etc..
Electromotor 12 can be any kind of electromotor (internal combustion, gas, diesel oil, fuel gas,
Natural gas, propane etc.), can have any size, with any amount of cylinder, and use
Any structure (" V " type, array, radial direction etc.).Electromotor 12 may be used for driving any machine or
Other devices, including highway truck or vehicle, field truck or machinery, earth-moving equipment, electromotor,
AEROSPACE APPLICATION, locomotive application, ocean application, pump, static equipment or other engine-driven application.
After-treatment system 14 includes discharge duct 18 and SCR (SCR) system 20.
SCR system 20 includes SCR catalyst 22, mixing duct 24, blender 26 and reducing agent supply
System 28.
SCR catalyst 22 includes being arranged in suprabasil catalyst material.Substrate can by cordierite,
Carborundum, other potteries or metal composition.Substrate can include multiple through passage and can form honeybee
Nest structure.
Reductant supply system 28 can include reducing agent 30, reducing agent source 32, pump 34, valve 36, go back
Former dose of pipeline 38 and ejector 40.Reducing agent 30 be sucked from reducing agent source 32 via pump 34 and
The conveying to ejector 40 is controlled via valve 36.Also reducing agent can be controlled by the operating of pump 34
The flowing of 30.
Mixing duct 24 is the section of the discharge duct 18 that reducing agent 30 is imported into.Mixing duct 24
Including inwall 25 and outer wall 27.Mixing duct 24 is also limited by inner width 29.
Reductant supply system 28 may also include the reducing agent 30 for freezing, prevents reducing agent
30 freeze or prevent the overheated heat management system of reducing agent 30.The component of reductant supply system 28 is also
Can be adiabatic, to prevent reducing agent 30 overheated.Reductant supply system 28 may also include for
Import compressed air to aid in the air assist system forming droplet in reducing agent spraying 44.Air
Aid system also can be used to when not using reductant line 38 and other reductant supply systems
28 components drive and send reducing agent 30.
Reducing agent 30 is from the nozzle of ejector 40 or injector tip 42, to form reducing agent spraying
44 or otherwise import in exhaust stream 16 or SCR catalyst 22.Injector tip 42
Position is so that guide reducing agent to spray directly down along the centrage of mixing duct 24 and blender 26
Mist 44.
After-treatment system 14 may also comprise diesel oxidation catalyst (DOC) 46, diesel particulate filters
Device (DPF) 48 and cleaning catalyst 50.DOC 46 and DPF 48 can be shown disposed on same
In one tank or separate.SCR catalyst 22 and cleaning catalyst 50 also can positions as shown in the figure
In the same pot or separate.
After-treatment system 14 is configured to remove, collect or convert undesirable composition from exhaust stream 16.
Carbon monoxide (CO) and unburned Hydrocarbon (HC) are changed into titanium dioxide by DOC 46
Carbon (CO2).DPF 48 collects particulate matter or soot.SCR catalyst 22 is configured to exist
The amount of the NOx of reduction exhaust stream 16 is reduced in the case of reducing agent 30.
May also include thermal source 52, to remove soot from DPF 48, heat management SCR catalyst 22,
DOC 46 or cleaning catalyst 50, to remove sulfur from SCR catalyst 22, or removing may be
The precipitate of the reducing agent 30 formed.Thermal source 52 can be presented as burner, at DOC 46
Formed exothermic reaction Hydrocarbon metering feed system, electrical heating elements, microwave device or other
Thermal source.Thermal source 52 also can be presented as and make electromotor 12 in the state producing exhaust stream 16 temperature raised
Lower operating.Thermal source 52 also can be presented as the counterbalance valve in aerofluxus or another confining device, so that aerofluxus
Flow 16 temperature to raise.
In the illustrated embodiment, exhaust stream 16 leaves electromotor 12, gets around or through thermal source 52,
Through DOC 46, DPF 48, it is then passed through SCR system 20, and then via discharge duct
18 through cleaning catalyst 50.
Also can SCR system 20 upstream, downstream or its inside other exhaust gas treatment devices are set.?
In the embodiment of diagram, SCR system 20 is positioned at DPF 48 downstream and DOC 46 is positioned at DPF 48
Upstream.Thermal source 52 is positioned at DOC 46 upstream.Cleaning catalyst 50 is positioned at SCR system 20 downstream.
In other embodiments, these devices can use various order arrange and may be combined.One
In individual embodiment, SCR catalyst 22 can combine with DPF 48, and wherein catalyst material is deposited in
On DPF 48.
Although other reducing agents 30 are possible, but carbamide is the source of most common reducing agent 30.Urine
Element reducing agent 30 decomposes or hydrolyzes ammonification (NH3) and then absorbed or be otherwise stored in
In SCR catalyst 22.Mixing duct 24 can be the longest, to assist the mixing of reducing agent 30 or equal
Even it be assigned in exhaust stream 16 and the time of staying changing into NH3 for carbamide reducing agent 30 is provided.
NH3 is reduced into nitrogen (N2) by NOx and is consumed in SCR catalyst 22.
Cleaning catalyst 50 can be presented as ammoxidation catalyst (AMOX).Cleaning catalyst 50 structure
Cause capture, store, aoxidize, reduce and/or convert and can slide past or through SCR catalyst 22
NH3.Cleaning catalyst 50 also may be configured to capture, stores, aoxidizes, reduces and/or convert other
The composition existed.
May also comprise controller and sensing system, to control electromotor 12, thermal source 52, reducing agent confession
Answer other components in system 28 and dynamical system 10 or its application.
Blender 26 includes around parts or ring 54.Ring 54 is illustrated as smooth, has super ring
Face shape and square-section, be similar to packing ring.In other embodiments, ring 54 can have various other
Cross section, including circle.
Ring 54 includes front face surface (face surface) 55, inner surface 56 and outer surface 57.Ring 54
Limited by the thickness 58 on the flow direction of exhaust stream 16, internal diameter 60, external diameter 61 and ring width 62
Fixed.Ring width 62 is the width of the parts forming ring 54 and is the difference of internal diameter 60 and external diameter 61
Half.The internal diameter 60 of ring 54 limits central opening 64.
Owing to ring 54 can be smooth, thus the surface of ring can with impenetrating thickness 58 be consistent also
Identical with front face surface 55.Transverse plane 65 is through blender and cuts mixing duct 24.The most flat
Face 65 includes the plane group parallel with it.Transverse plane 65 can arrange along front face surface 55 or
Can extend across another part of blender 26.Transverse plane 65 can be perpendicular to exhaust stream 16, as
Shown in figure.Transverse plane 65 also can be perpendicular to the inwall 25 of mixing duct 24.In other embodiments,
Transverse plane 65 can become various angle configurations with exhaust stream 16 and inwall 26.
Although ring 54 is described and illustrated as toroid and circular and have " diameter ", but ring 54
Can also be rectangle, octagonal, triangle or any other shape.The shape of ring 54 can be with
The inner circumferential of mixing duct 24 is consistent and can accordingly with the shape of its mixing duct 24 of receiving at least
Part coupling.Ring 54 also can have and is different from the shape of mixing duct 24 and is suitably sized to coordinate
In mixing duct 24, (such as, ring 54 can have the square coordinated in circular mixing duct 24
Shape).Ring width 62 may or may not be constant.The profile of ring 54 may also differ from internal shape
Shape (such as, profile can be circular, and interior shape and central opening 64 can be rectangles).
Blender 26 may also comprise the separate distance piece of inwall 25 66 of ring 54 with mixing duct 24.
Distance piece 66 also can be used to mounting ring 54.
Separation between outer surface 57 and the inwall 25 of ring 54 limits gap 68.Gap 68 can be
Annular or there is difformity.Gap 68 can have gap width 70.Gap width 70 is at ring
May or may not be constant around 54.In certain embodiments, some positions at ring 54 are permissible
There is not gap 68.
Some dimensional conditions of blender 26 presented below.These dimensional conditions can be depending on different
The a large amount of variablees that can change between dynamical system 10.Such as, suitable blender 26 size can
Depend on exhaust stream 16 speed, mixing duct 24 size, electromotor 12 load cycle, electromotor
Spray 44 drop sizes, reducing agent of 12 backpressure requirements, reducing agent is sprayed 44 speed.In order to this is described
A little variablees, limit following size in terms of ratio and provide scope.
Gap width 70 can be about 1/8 inch.In other embodiments, gap width 70 can
With between 1/16 and 1/4 inch.In other other embodiments, gap width 70 can be situated between
Between 1/16 and 1/2 inch.
The size of gap width 70 can also be the function of inner width 29.In one embodiment, gap
68 along the area of transverse plane 65 can be mixing duct along transverse plane 65 area about
1.3%.In other embodiments, gap 68 can be between mixing tube along the area of transverse plane 65
Road is along between 0.5% and 5% of the area of transverse plane 65, between 0.1% and 10% or 0.7%
And between 2%.
Ring width 62 can be about 2 inches.In other embodiments, ring width 62 can be between 1
And between 3 inches.In other other embodiments, ring width 62 can between 0.5 and 5 inch it
Between.
The size of ring width 62 can also be the function of inner width 29.In one embodiment, ring width
62 can be about the 10% of inner width 29.In other embodiments, ring width 62 can be between inner width
Between 5% and 15% of 29 or between 2% and 25%.
Gap width 70 and ring width 62 also may be selected to realize central opening 64 according to inner width 29
Intended size.In one embodiment, central opening 64 along the area of transverse plane 65 can be
Mixing duct 24 along transverse plane 65 area about 62%.In other embodiments, central authorities
Opening 64 can be between mixing duct 24 along transverse plane 65 along the area of transverse plane 65
Between 50% and 70% of area, between 40% and 80%, between 30% and 80% or 20% and 90%
Between.
Ring 54 can be made up of metallic plate, and therefore thickness 58 can be smaller, but it is permissible
It is various sizes.In one embodiment, this thickness can be less than 1(mono-) inch.At another
In embodiment, this thickness can be less than 1/4 inch.Thickness 58 is also smaller than ring width 62.
Fig. 2-6 shows the various embodiments of the blender 26 with various features as described below.Mixed
Clutch 26 can include any combination of the feature described in literary composition.Ring 54 is shown by Fig. 2 as solid surface
Go out.Fig. 2 also illustrates that distance piece 66 by being separated with inwall 25 by ring 54 and can be mounted or connected to inwall
The spot welding 72 of 25 is formed.
Fig. 3 shows that ring 54 can include the one or more openings 73 through front face surface 55.Opening
73 can have the various positions on ring 54 and can form various pattern.Fig. 3 also illustrates that distance piece
66 can be formed by the contact pin (tab) 74 extended from the outer surface 57 of ring 54.The far-end of contact pin 74 is right
The most solderable, insert or be otherwise connected to mixing duct 24, with by ring 54 and inwall 25 points
From and be mounted or connected to inwall 25, and form gap 68.
Fig. 4 shows that blender 26 can include the central construct 76 extending in central opening 64.This
A little central construct 76 can be from the inner surface 56 of ring 54 or from another position or body extension.Central authorities' knot
Structure 76 can be presented as big parts, little tinsel or silk screen.
Fig. 5 shows can increase deflector 78 on blender 26.Deflector 78 includes that deflector is opened
Mouth 80 and deflector 82.Deflector 82 and exhaust stream 16 becomes the angle configurations less than 90 degree thus
Guide exhaust stream 16 at a certain angle by deflector opening 80.Deflector 78 can pass through curved cuts
84 or punching press scallop (scallop) 86 and formed.Fig. 6 illustrates that deflector 82 also can be by distance piece
66 or central construct 76 formed.
Fig. 1 shows the blender 26 position in mixing duct 24.Blender 26 is away from ejector
It is arranged in inwall 25 at the blender distance 88 of end 42.Blender distance 88 can be so
: when reducing agent spraying 44 arrival ring 54, spraying 44 sizes when it expands are the most central
The size of opening 64.
Fig. 7 shows that blender 26 can be used in double branch pipe after-treatment system 90.Double branch pipe post processing
System 90 includes receiving exhaust stream 16 and first of the reducing agent 30 from reductant supply system 28
With the 2nd SCR arm 91 and 92.
From the exhaust stream 16 of mixing duct 24 in the separation section 93 of discharge duct 18 divided
Or separate.Separate section 93 to can be located at the separation distance 94 in blender 26 downstream.Separation distance
94 comparable mixer distances 88 are long.In one embodiment, separation distance can be the letter of inner width 29
Number.Separation distance 94 can be about 1.2 times of inner width 29.In other embodiments, separate away from
From 94 can be inner width 29 more than 1.2 times, between 1 and 2 times or between 1 and 3 times.
Double branch pipe after-treatment system 90 may also comprise and exhaust stream 16 is delivered to reductant supply system 28
First and second entrance arms 95 and 96.From the first and second rows entering arm 95 and 96
Air-flow 16 is divided or separation in the merging section 97 of discharge duct 18.
First and second enter arm 95 and 96 is shown as including DPF 48 and DOC 46, but can
Not include any of the above described one, or other components can be included.In one embodiment, first
Enter arm 95 and 96 with second and do not include DPF 48.First and second enter arm 95 and 96 also
Can be shown as relative to the first and second SCR arm 91 and 92 configurations at a right angle, but can become each
Plant other angle configurations or can configure linearly.Double branch pipe after-treatment system 90 also can be accommodated in band
Have in the box structure of the inwall separating exhaust stream.
Blender 26 component can be made up of steel or any other various materials.Blender 26 also can coat
There is the material assisting reducing agent 30 to convert or be hydrolyzed into NH3.
Industrial applicibility
Blender 26 contributes to reducing agent 30 is uniformly distributed or is mixed in exhaust stream 16, promotes
Reducing agent 30 changes into NH3, and prevents sedimentary formation.Blender 26 also should cheaply,
Little and form no minimum.But, these features are conflicted the most mutually.Such as, bigger and complicated
Structure can reducing agent 30 is uniformly distributed in exhaust stream 16 and promote reducing agent 30 change into
NH3 aspect is effectively but cheap, occupies too much space, and frequently forms a large amount of back pressure.
Reducing agent 30 is uniformly distributed in exhaust stream 16 by NH3 being directed to equably SCR
All passages of catalyst and improve the efficiency of SCR system 20 and therefore can occur to convert in a large number.
It is uniformly distributed to reducing agent 30 in exhaust stream 16 also to reduce going back needed for realizing bigger efficiency
The amount of former dose 30.It is uniformly distributed to reducing agent 30 in exhaust stream 16 still prevent too much NH3
It is directed to may result in a part of SCR catalyst region that NH3 slips over.
It is likely to be formed precipitate when reducing agent 30 resolves into the most rapidly NH3, and assembles reducing agent
The thick-layer of 30.These layers can accumulate along with increasing reducing agent 30 is injected or collects, this
Can have and stop the cooling effect resolving into NH3.As a result, reducing agent 30 be sublimed into crystal or with
Other modes are transformed into solid constituent and form precipitate.Pellet fraction can comprise biuret
(NH2CONHCONH2) or cyanuric acid ((NHCO) 3) or another kind of component, depend on
Temperature and other conditions.These precipitate may be formed at what reducing agent spraying 44 was clashed into, and precipitated or stagnated
In region or on surface.
The operating of dynamical system 10 can be adversely affected by these precipitate.Precipitate can block exhaust stream
16 flowings, cause higher back pressure and reduce electromotor 12 and after-treatment system 14 performance and efficiency.
Precipitate also can interrupt reducing agent 30 and flows and be mixed in exhaust stream 16, thus reduces and resolves into
NH3 also reduces NOx reduction efficiency.Sedimentary formation is also consumed by reducing agent 30, makes injection
Control be more difficult to and potentially reduce NOx reduction efficiency.Precipitate is also possible to corrosion and degraded SCR
The component of system 20.
Limit back pressure increase the most critically important.High back pressure can endanger electromotor 12 performance.High back pressure also can draw
Play precipitate to be formed and exhaust gas leakage.
Ring 54 can form limited back pressure, and still realizing higher reducing agent 30 is mixed into exhaust stream simultaneously
Degree in 16.The large scale of central opening 64 limits restriction and also forms turning over of exhaust stream 16
Rolling (tumbling), this rolling is mixed in exhaust stream 16 effectively for making reducing agent 30.Permitted
Many other blenders designs are achieved and are mixed or formed high turbulent flow level by eddy flow.These hybrid instruments
There is a complicated and huge structure, and the most costly and produce back pressure.Instead, it has been found that it is logical
The rolling crossing ring 54 realization is effective for mixing, produces also cheap simultaneously, and will not produce it
The back pressure of the amount that his blender is the biggest.The even shape of ring 54 is by the cheap simple sheet material of cutting
Be conducive to it to manufacture.More complicated blender needs the more complicated cutting of costliness, bends and weld.
Gap 68 can be used to allow exhaust stream 16 to flow through, still realize above-mentioned tumbling effect simultaneously.This
Plant and flow through the stagnation gathering preventing from otherwise being formed sedimentary reducing agent 30.This flowing through additionally aids
Reduce back pressure.If gap 68 is excessive, the most above-mentioned tumbling effect may be hindered, because flowing in a large number
Move and will only be in carrying out around ring 54 rather than rolling through central opening 64.If gap 68 is too small, then
Described flowing through may be not enough to prevent precipitate or realize substantially reducing of back pressure.
Gap 68 can position along the periphery of the outer surface 57 along ring 54, will gather because this is reducing agent
The position of collection.In certain embodiments, gap 68 can be only located at the bottom of ring 54, reducing agent 30
Otherwise can assemble here.
Blender 26 can affect sedimentary formation with the blender distance 88 of injector tip 42 and mix
Close effect.If blender distance 88 is too short, then reducing agent spraying 44 will focus in little space,
Because spraying 44 does not the most expand.Correspondingly, central opening 64 can be only passed through in reducing agent spraying 44
Accurate central part.Owing to spraying 44 will focus in little space and only by central opening
The heart, so above-mentioned tumbling effect may will not work, and reducing agent 30 is mixed into exhaust stream 16
In may be not up to desired degree.If blender distance 88 is long, then reducing agent spraying 44
Bigger volume will be had expanded to and can impinge upon before being converted into NH3 on ring 54 or inwall 25.
This shock may cause precipitate formed as discussed above.
Opening 73 can be used to help reduce back pressure and also weight can be alleviated.It is used as opening 73
Form flowing through and discharging area of reducing agent 30 gathering, be therefore prevented from precipitate.
Central construct 76 can help to make reducing agent to spray 44 fragmentations and atomization, thereby assists in and is converted into
NH3.Central construct 76 also can import helping the turbulent flow being converted into NH3 in exhaust stream 16.In
Centre structure 76 can be formed without precipitate, because they are positioned at the region with high flow rate and high-temperature
In.Central construct 76 also can increase rigidity and the structural strength of blender 26.
Deflector 78 can be used also to be imported by eddy flow in exhaust stream 16 for other in addition to rolling
Mixing.In certain embodiments, deflector 78 can produce reverse rotation eddy flow.As opening 73,
Deflector 78 also assists in minimizing back pressure and also can alleviate weight.It is used as deflector 78 and carrys out shape
Become flowing through and discharging area of reducing agent 30 gathering, be therefore prevented from precipitate.
Blender 26 is also suitably adapted for double branch pipe after-treatment system 90.Double branch pipe after-treatment system 90 is normal
Often with relatively large engine system combination.Double branch pipe after-treatment system 90 can allow to use less after
Process substrate.Owing to these substrates may often be such that the ceramic body of complexity, so they can use less chi
Very little economically produce.Less size also can be improved packaging and selects and improve the flowing across basal surface
Distribution.
Owing to blender 26 imports limited back pressure, so it can combine equably from first and second
Enter the exhaust stream 16 of arm 95 and 96.The rolling formed by blender 26 is also assisted in will arrange
Air-flow 16 flowing is separated into first and second and leaves in arm 91 and 92.Depend heavily on eddy flow and
The blender of turbulent flow can be formed and leave the bias current of any one in arm 91 and 92 towards first and second.
Separation distance 94 can affect exhaust stream 16 even partition that flows and leave arm 91 to first and second
With 92 in and prevent formed precipitate.
Separation distance 94 can affect exhaust stream 16 even partition that flows and leave arm 91 to first and second
In 92.If separation distance 94 is too short, then reducing agent 30 is likely not to have the time and changes into NH3
And the rolling effect from blender 26 may be big.Bad before section 93 NH3 is changed into separating
Impinge upon such as reducing agent and on wall, produce precipitate.Big rolling may cause being partial to the first He
Second leaves the one in arm 91 and 92.If separation distance is long, then may cause double branch pipe
The packaging of after-treatment system 90 is difficult and loss may be caused to activate SCR catalyst 22 and prevent shape
Become the heat needed for precipitate.
Although blender 26 is described as assisting to import reducing agent exhaust stream above, but it is also contemplated that
Blender 26 can be used to assist to import in any various flowings any various materials.Although such as institute in literary composition
The embodiments of the invention stated can be combined without departing from the scope of following claims, but for ability
It would be apparent that may be made that various remodeling and modification for field technique personnel.According to description
With the practice to the present invention, other embodiments will be apparent to for a person skilled in the art.Should
Think that description and example are the most exemplary, the true scope of the present invention by following claims and it
Equivalent indicate.
Claims (8)
1. an engine exhaust aftertreatment system (14), including:
It is configured to the injection being imported by reducing agent (30) in the discharge duct (24) of electromotor (12)
Device (40)；With
Ring (54) in the downstream of described ejector (40) is arranged in described discharge duct (24),
Wherein, the outer surface (57) of described ring (54) is attached to and described discharge duct (24)
Multiple distance pieces (66) that inwall (25) directly contacts, outer surface (57) in described ring (54),
Between two in the inwall (25) of described discharge duct (24) and the plurality of distance piece (66)
The gap (68) that gas flows through it is formed between spacing body,
Wherein, described ring (54) includes multiple opening (73), deflector (82) and extends to institute
State the central construct (76) in the central opening (64) in ring (54).
Engine exhaust aftertreatment system the most according to claim 1 (14), wherein, described
Ring (54) is smooth.
Engine exhaust aftertreatment system the most according to claim 1 (14), wherein, described
Ring (54) has toroidal shape and has square-section.
4. according to the engine exhaust aftertreatment system (14) according to any one of claim 1-3,
Wherein, described ring (54) limits central opening (64), and described central opening is along described exhaustor
The area of the transverse plane (65) in road (24) between described transverse plane (65) at described exhaustor
Between 50% and 70% of the area in road (24).
5. according to the engine exhaust aftertreatment system (14) according to any one of claim 1-3,
Wherein, described gap (68) have the width (70) between 1/16 and 1/2 inch.
6. according to the engine exhaust aftertreatment system (14) according to any one of claim 1-3,
Wherein, described gap (68) are along the area of the transverse plane (65) of described discharge duct (24)
Between the described transverse plane (65) area in described discharge duct (24) 0.5% and 5% it
Between.
7. according to the engine exhaust aftertreatment system (14) according to any one of claim 1-3,
Wherein, described ring (54) is positioned at certain distance (88) place away from described ejector (40) so that
When the spraying (44) of described reducing agent (30) arrives described ring (54), described spraying (44)
It is not more than the central opening (64) of described ring (54).
8. according to the engine exhaust aftertreatment system (14) according to any one of claim 1-3,
Wherein, described discharge duct (24) is more than described in described ring (54) downstream away from described ring (54)
Distance (94) place of the width (29) of discharge duct (24) be separated into 2 or more arm (91,
92)。
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/754,144 | 2010-04-05 | ||
| US12/754,144 US20110239631A1 (en) | 2010-04-05 | 2010-04-05 | Ring Reductant Mixer |
| PCT/US2011/030865 WO2011126930A2 (en) | 2010-04-05 | 2011-04-01 | Ring reductant mixer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102933810A CN102933810A (en) | 2013-02-13 |
| CN102933810B true CN102933810B (en) | 2016-09-28 |
Family
ID=44708017
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180027335.7A Expired - Fee Related CN102933810B (en) | 2010-04-05 | 2011-04-01 | Ring reductant mixer |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20110239631A1 (en) |
| CN (1) | CN102933810B (en) |
| DE (1) | DE112011101199T5 (en) |
| GB (1) | GB2491777A (en) |
| WO (1) | WO2011126930A2 (en) |
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- 2011-04-01 DE DE112011101199T patent/DE112011101199T5/en not_active Withdrawn
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Also Published As
| Publication number | Publication date |
|---|---|
| GB201217708D0 (en) | 2012-11-14 |
| WO2011126930A3 (en) | 2012-04-05 |
| GB2491777A (en) | 2012-12-12 |
| CN102933810A (en) | 2013-02-13 |
| WO2011126930A2 (en) | 2011-10-13 |
| DE112011101199T5 (en) | 2013-01-24 |
| US20110239631A1 (en) | 2011-10-06 |
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