CN106567763A - Mixing device applied to engine SCR system, engine SCR system and engine - Google Patents
Mixing device applied to engine SCR system, engine SCR system and engine Download PDFInfo
- Publication number
- CN106567763A CN106567763A CN201610915715.9A CN201610915715A CN106567763A CN 106567763 A CN106567763 A CN 106567763A CN 201610915715 A CN201610915715 A CN 201610915715A CN 106567763 A CN106567763 A CN 106567763A
- Authority
- CN
- China
- Prior art keywords
- tube portion
- electromotor
- mixing arrangement
- scr system
- tapered
- 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.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—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
-
- 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
-
- 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
- B01F25/421—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 by moving the components in a convoluted or labyrinthine path
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1486—Means to prevent the substance from freezing
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention provides a mixing device applied to an engine SCR system. The mixing device comprises an outer pipe, an inner pipe and a flow guiding component. The outer pipe is provided with multiple through holes and connected with a gas inlet pipe of the engine SCR system. The inner pipe is provided with multiple through holes and composed of a gradually-reducing pipe part and a straight pipe part which are integrally connected, and in addition, the gradually-reducing pipe part communicates with the straight pipe part so as to be used for receiving discharged gas entering the inner pipe from the gas inlet pipe. The upper end of the flow guiding component is fitted to the inner wall of the outer pipe, and the lower end of the flow guiding component is fitted to the outer wall of the straight pipe part, so that a flow guiding space is formed between the inner wall of the flow guiding component and the outer wall of the gradually-reducing pipe part. The invention further provides the engine SCR system comprising the mixing device and an engine comprising the engine SCR system.
Description
Technical field
The present invention relates to engine exhaust (such as waste gas) catalytic reduction technique, in particular it relates to be used for electromotor SCR systems
The mixing arrangement of system, including the electromotor SCR system of this mixing arrangement and starting including this electromotor SCR system
Machine.
Background technology
Due to diesel combustion characteristic, HC, CO of discharge exists a large amount of diesel engine with respect to gasoline engine much less in emission
NOx.Therefore, Exhaust Control for Diesel Engine it is important that reduce NOx discharge capacity.
SCR (Selective Catalytic Reduction, catalytic reduction technique) is using NH3 and NOx (nitrogen oxidations
Thing) there is catalytic reduction reaction to reduce the technology of NOx in even eliminating electromotor, such as the waste gas of diesel engine, to meet state
IV and above emission request.Generally, SCR system is broadly divided into control unit, carbamide dosage device, carbamide and tail gas according to function
Mixing arrangement and the part of catalytic reaction unit four.
Wherein, dress is being mixed with the waste gas of diesel engine by the carbamide that carbamide dosage device sprays according to the control of control unit
Put middle mixing so that aqueous solution of urea and waste gas are hydrolyzed reaction, and producing carries out the reducing agent ammonia of catalytic reduction reaction, and
And, in catalytic reaction unit, nitrogen oxides are reduced to nitrogen by ammonia in the presence of catalyst, so that diesel engine vent gas
Meet Abgasgesetz.
Referring to Fig. 1, the mixing arrangement for electromotor SCR system of the prior art is it illustrates, wherein, the mixing dress
Put bore partially including air inlet, the inner tube with multiple through holes and the outer tube with multiple through holes.Partial exhaust stream is inclined by air inlet
Multiple apertures, such as 7 holes on cone are imported between inner tube and outer tube, so as to dispel the urea droplets on outer wall of inner tube.Due to 7
Individual gas inlet hole amount is less so that flow velocity when waste gas stream is reached at urea droplets drop point is very low, is difficult to take away at outer wall of inner tube
Urea droplets, in turn result in crystallization risk herein higher.
Additionally, outer wall is bored in air inlet partially welding together with inner tube wall, carbamide spray fan in the presence of waste gas stream, urinate by part
Plain drop is liable to stick to the weld of air inlet partially cone and inner tube, easily forms urea crystals body, thus the knot at this region
Brilliant risk is also higher.Meanwhile, inner tube bottom velocity is slower, and carbamide liquid film is thicker, and liquid film is easily accumulated in herein, also easily forms urine
Plain crystalline polamer, affects the reliability and adaptability of SCR aftertreatment system.
Accordingly, it would be desirable to solve the problems, such as there is crystallization risk in prior art in mixing arrangement.
The content of the invention
The purpose of the present invention is to overcome there is a problem of in mixing arrangement crystallization risk, and the purpose is by following technical side
What case was realized.
The invention provides a kind of mixing arrangement for electromotor SCR system, the mixing arrangement includes：With multiple
The outer tube of through hole, the outer tube is connected with the air inlet pipe of the electromotor SCR system；Inner tube with multiple through holes, it is described interior
Pipe is made up of the tapered tube portion and straight-tube portion of integrally connected, also, the tapered tube portion is connected with the air inlet pipe, is used
In the aerofluxuss that reception is entered via the air inlet pipe；And air guide, wherein, the upper end of the air guide is engaged to described
The inwall of outer tube, the lower end of the air guide is engaged to the outer wall of the straight-tube portion, so as in the air guide
Diversion space is formed between the outer wall of wall and the tapered tube portion.
By this structure of mixing arrangement, when SCR system is run, urea droplets are injected in mixing arrangement and arrange
Gas enters air inlet pipe, and quick exhaust stream, this quick exhaust stream can be produced between tapered tube portion and air guide
The urea droplets on the outer wall of tapered tube portion can well be purged so that carbamide quickly spreads decomposition, it is impossible in drop point area
Domain is collected as crystal form, also, this quick exhaust stream can purge the urea droplets of the interior intracavity of tapered tube portion, make
Obtaining carbamide cannot be collected as crystal form on the inwall of tapered tube portion.Additionally, this mixing arrangement can modularly set
A part is calculated as, in being integrated to the SCR system or SCR catalytic mufflers of state IV or state V institutes organic type, highly versatile.
According to a further aspect in the invention, the air guide is tapered or arc is bowl-shape.
According to a further aspect in the invention, the tapered tube portion is tapered or arc is bowl-shape.
According to a further aspect in the invention, the described tapered tube portion of said inner tube is provided with least one and cuts at outer edge
Mouthful, so as to form at least one groove between the tapered tube portion and the air guide, the aerofluxuss of entrance via it is described extremely
A few groove enters the diversion space.
According to a further aspect in the invention, the tapered tube portion and the straight-tube portion are one by rotary press modelling
Connection, or, the tapered tube portion and the straight-tube portion are integrally connected and described tapered by overlap joint welding
Tube portion is inserted in the straight-tube portion.
According to a further aspect in the invention, an at least exhausting hole of said inner tube is in the diversion space.
According to a further aspect in the invention, the bottom of the straight-tube portion is provided with least one guiding gutter, and air-flow can
Flow out from least one guiding gutter.
Present invention also offers a kind of electromotor SCR system, the electromotor SCR system includes previously described mixing dress
Put.Present invention also offers a kind of electromotor, the electromotor includes previously described electromotor SCR system.The electromotor
For example, diesel engine.
Description of the drawings
By the detailed description for reading hereafter preferred implementation, various other advantages and benefit is common for this area
Technical staff will be clear from understanding.Accompanying drawing is only used for illustrating the purpose of preferred implementation, and is not considered as to the present invention
Restriction.And in whole accompanying drawing, it is denoted by the same reference numerals identical part.In the accompanying drawings：
Fig. 1 shows the mixing arrangement for electromotor SCR system of the prior art；
Fig. 2 shows the sectional view of the mixing arrangement for electromotor SCR system according to embodiment of the present invention, its
In, the flow path that the aerofluxuss of entrance are purged is shown with arrow；
Fig. 3 shows the axonometric chart of the mixing arrangement according to embodiment of the present invention, wherein, for high-visible, remove
Outer tube and air inlet pipe, also, show carbamide jet path；
Fig. 4 shows the axonometric chart of the inner tube of the mixing arrangement according to embodiment of the present invention；
Fig. 5 shows the axonometric chart of the air guide of the mixing arrangement according to embodiment of the present invention；
Fig. 6 shows the mixing arrangement of alternate embodiments of the invention, wherein, for high-visible, only illustrate
Air guide and inner tube.
Specific embodiment
The illustrative embodiments of the disclosure are more fully described below with reference to accompanying drawings.Although showing this public affairs in accompanying drawing
The illustrative embodiments opened, it being understood, however, that may be realized in various forms the disclosure and the reality that should not be illustrated here
The mode of applying is limited.On the contrary, there is provided these embodiments are able to be best understood from the disclosure, and can be by this public affairs
The scope opened it is complete convey to those skilled in the art.
Embodiments of the present invention are described in detail hereinafter with reference to Fig. 2 to Fig. 5.
Fig. 2 shows the sectional view of the mixing arrangement 100 for electromotor SCR system according to embodiment of the present invention,
Wherein, mixing arrangement 100 includes：Outer tube 10 with multiple through holes, the inner tube 20 with multiple through holes and air guide 30,
Outer tube 10 is for example connected by welding with the air inlet pipe 40 of electromotor SCR system, and air inlet pipe 40 is for example by entering for linking together
Gas straight tube 411 and air inlet eccentric pipe 412 are constituted.Inner tube 20 by integrally connected 212 groups of tapered tube portion 211 and straight-tube portion
Into, also, tapered tube portion 211 connects with air inlet pipe 40, for example, connect with air inlet eccentric pipe 412, for receiving via air inlet
The aerofluxuss that pipe 40 is entered.The upper end of air guide 30 is engaged to the inwall of outer tube 10, and the lower end of air guide 30 is engaged to straight tube
The outer wall of part 212, so as to form diversion space S between the outer wall of the inwall of air guide 30 and tapered tube portion 211.
By this structure of mixing arrangement, when SCR system is run, urea droplets are injected in mixing arrangement and arrange
Gas enters air inlet pipe, and quick exhaust stream, this quick exhaust stream can be produced between tapered tube portion and air guide
The urea droplets on the outer wall of tapered tube portion can well be purged so that carbamide quickly spreads decomposition, it is impossible in drop point area
Domain is collected as crystal form, also, this quick exhaust stream can purge the urea droplets of the interior intracavity of tapered tube portion, make
Obtaining carbamide cannot be collected as crystal form on the inwall of tapered tube portion.Additionally, this mixing arrangement can modularly set
A part is calculated as, in being integrated to the SCR system or SCR catalytic mufflers of state IV or state V institutes organic type, highly versatile.
Additionally, mixing arrangement 100 can also include urea nozzle installing port 50, as shown in Figure 2, urea nozzle installing port
50 are used to receive carbamide injection apparatus 70 as shown in Figure 3.Additionally, mixing arrangement 100 can also include bottom cover 60, bottom cover 60
Outer tube 10 is for example hermetically connected to by welding, for inner tube 20 to be airtightly maintained in outer tube 10, such as Fig. 2 and Fig. 3
It is shown.
Additionally, air guide 30 is tapered, as shown in Figure 5, but air guide 30 can also be curved bowl-shape, that is, be in
Non-tapered is bowl-shape.Additionally, tapered tube portion 211 is curved bowl-shape, as shown in Fig. 2 to Fig. 4, but tapered tube portion 211
Can also tapered or vase bottleneck shape, as long as the shape with gradual change.
By this shape contour of tapered tube portion, carbamide spray fan drop point segment smoothing transition can be made, further be made
Obtaining carbamide cannot be collected as crystal form in drop point region.
Additionally, the tapered tube portion 211 of inner tube 20 is provided with least one otch 213 at outer rim, example in figs. 3 and 4
Such as it is 3 otch, so as to form at least one groove between tapered tube portion 211 and air guide 30, such as 3 grooves are entered
Aerofluxuss enter diversion space S between tapered tube portion 211 and air guide 30 via such as 3 grooves.This can be further
Improve the intensity that aerofluxuss are purged.
Additionally, tapered tube portion 211 and straight-tube portion 212 are integrally connected by rotary press modelling, this can be caused
Carbamide spray fan drop point region smoothly transits, such that it is able to further such that carbamide cannot be collected as crystal form in drop point region.
Alternatively, tapered tube portion 211 with straight-tube portion 212 is welded and integrally connected by overlap joint, and tapered tube portion 211
In insertion straight-tube portion 212, as shown in alternate embodiments in figure 6, this can reduce difficulty of processing, also, will
Reducing pipe is inserted partially in inner tube and outside welding can reduce crystallizing risk.
Additionally, an at least exhausting hole of inner tube 20 is in the diversion space S between tapered tube portion 211 and air guide 30
In, for example, in the diversion space S of the first row through hole of inner tube 20 between tapered tube portion 211 and air guide 30, such as scheme
Shown in 2 and Fig. 6.This can make exhaust stream pass through an at least exhausting hole, such as the first exhausting hole enter inner tube 20 in, so as to and
When purge the urea droplets assembled at the inwall of inner tube 20, reduce adhesion time and adhesive capacity of the urea droplets on wall, from
And avoid forming urea deposits in inner tube wall.Additionally, the caliber of inner tube, perforate size and the number of openings can be according to electromotors
Exhaust gas flow carrys out reasonable design, to ensure the uniformity of air velocity and mixing, while meeting the requirement of the pressure loss.
Additionally, the bottom of straight-tube portion is provided with least one guiding gutter 214, lead for for example, three in the present embodiment
Chute, air-flow can flow out from least one guiding gutter 214, it is to avoid form air-flow dead band in interior bottom of the tube and urea crystals occur
Phenomenon.
Additionally, this mixing arrangement can be configured in electromotor SCR system, also, this electromotor SCR system can be with
In being attached to electromotor, the electromotor is, for example, diesel engine.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any those familiar with the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
All should be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Enclose and be defined.
Claims (10)
1. a kind of mixing arrangement for electromotor SCR system, it is characterised in that the mixing arrangement includes：
Outer tube with multiple through holes, the outer tube is connected with the air inlet pipe of the electromotor SCR system；
Inner tube with multiple through holes, said inner tube is made up of the tapered tube portion and straight-tube portion of integrally connected, also, described
Tapered tube portion is connected with the air inlet pipe, for receiving the aerofluxuss entered via the air inlet pipe；And
Air guide, wherein, the upper end of the air guide is engaged to the inwall of the outer tube, and the lower end of the air guide is matched somebody with somebody
The outer wall of the straight-tube portion is bonded to, so as to be formed between the outer wall of the inwall of the air guide and the tapered tube portion
Diversion space.
2. mixing arrangement according to claim 1, it is characterised in that the air guide is tapered or arc is bowl-shape.
3. mixing arrangement according to claim 1, it is characterised in that the tapered tube portion is tapered or arc is bowl-shape.
4. the mixing arrangement according to any one of claims 1 to 3, it is characterised in that said inner tube it is described tapered
Tube portion is provided with least one otch at outer rim, so as to be formed at least between the tapered tube portion and the air guide
One groove, the aerofluxuss of entrance enter the diversion space via at least one groove.
5. the mixing arrangement according to any one of claims 1 to 3, it is characterised in that the tapered tube portion and institute
It is integrally connected by rotary press modelling to state straight-tube portion, or, the tapered tube portion and the straight-tube portion are to pass through
Overlap joint welding and integrally connected and in straight-tube portion described in the reducing pipe partial insertion.
6. the mixing arrangement according to any one of claims 1 to 3, it is characterised in that an at least row of said inner tube
Through hole is in the diversion space.
7. the mixing arrangement according to any one of claims 1 to 3, it is characterised in that the bottom of the straight-tube portion
At least one guiding gutter is provided with, air-flow can flow out from least one guiding gutter.
8. a kind of electromotor SCR system, it is characterised in that the electromotor SCR system is included according in claim 1 to 7
Mixing arrangement described in any one.
9. a kind of electromotor, it is characterised in that the electromotor includes electromotor SCR system according to claim 8.
10. electromotor according to claim 9, it is characterised in that the electromotor is diesel engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610915715.9A CN106567763B (en) | 2016-10-21 | 2016-10-21 | Mixing arrangement, engine SCR system and engine for engine SCR system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610915715.9A CN106567763B (en) | 2016-10-21 | 2016-10-21 | Mixing arrangement, engine SCR system and engine for engine SCR system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106567763A true CN106567763A (en) | 2017-04-19 |
| CN106567763B CN106567763B (en) | 2019-05-28 |
Family
ID=58533125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610915715.9A Active CN106567763B (en) | 2016-10-21 | 2016-10-21 | Mixing arrangement, engine SCR system and engine for engine SCR system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106567763B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019127311A1 (en) * | 2017-12-26 | 2019-07-04 | 潍柴动力股份有限公司 | Scr system urea mixer and scr system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4651524A (en) * | 1984-12-24 | 1987-03-24 | Arvin Industries, Inc. | Exhaust processor |
| DE202007010324U1 (en) * | 2007-07-25 | 2008-11-27 | Heinrich Gillet Gmbh | Apparatus for aftertreating the exhaust gases of diesel engines |
| CN201470307U (en) * | 2009-09-04 | 2010-05-19 | 东风汽车有限公司 | Turbulent flow mixer for tail gas of engine |
| US20100199645A1 (en) * | 2006-03-28 | 2010-08-12 | Et Uk Industries Limited | Mixing device for an exhaust system |
| CN203452874U (en) * | 2013-07-09 | 2014-02-26 | 潍柴动力股份有限公司 | SCR catalyzing silencer and mixing tube device of SCR catalyzing silencer |
-
2016
- 2016-10-21 CN CN201610915715.9A patent/CN106567763B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4651524A (en) * | 1984-12-24 | 1987-03-24 | Arvin Industries, Inc. | Exhaust processor |
| US20100199645A1 (en) * | 2006-03-28 | 2010-08-12 | Et Uk Industries Limited | Mixing device for an exhaust system |
| DE202007010324U1 (en) * | 2007-07-25 | 2008-11-27 | Heinrich Gillet Gmbh | Apparatus for aftertreating the exhaust gases of diesel engines |
| CN201470307U (en) * | 2009-09-04 | 2010-05-19 | 东风汽车有限公司 | Turbulent flow mixer for tail gas of engine |
| CN203452874U (en) * | 2013-07-09 | 2014-02-26 | 潍柴动力股份有限公司 | SCR catalyzing silencer and mixing tube device of SCR catalyzing silencer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019127311A1 (en) * | 2017-12-26 | 2019-07-04 | 潍柴动力股份有限公司 | Scr system urea mixer and scr system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106567763B (en) | 2019-05-28 |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20180903 Address after: 261061 No. 197, Fu Shou street, hi tech Industrial Development Zone, Weifang, Shandong. Applicant after: Weichai Dynamic Co., Ltd. Applicant after: Weichai Power Air Purification Technology Co. Ltd. Address before: 261061 No. 169 Weifang Road, hi tech Zone, Weifang, Shandong Applicant before: Weichai Power Air Purification Technology Co. Ltd. |
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