CN105041433A - Automotive SCR system - Google Patents
Automotive SCR system Download PDFInfo
- Publication number
- CN105041433A CN105041433A CN201510555708.8A CN201510555708A CN105041433A CN 105041433 A CN105041433 A CN 105041433A CN 201510555708 A CN201510555708 A CN 201510555708A CN 105041433 A CN105041433 A CN 105041433A
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- CN
- China
- Prior art keywords
- outlet pipe
- catalyst converter
- urea
- scr system
- aqueous solution
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Exhaust Gas After Treatment (AREA)
Abstract
The invention relates to an automotive SCR system which comprises a catalytic converter, an exhaust pipe, an ammonia mixer and a urea aqueous solution mixer. Through the urea aqueous solution mixer and the ammonia mixer, the problems that in an automotive SCR system, uniformity of a urea aqueous solution sprayed into the exhaust pipe is poor, and uniformity of the concentration of NH3 entering carriers is poor are solved. The uniformity of the concentration of NH3 is increased through the structure of the ammonia mixer. The uniformity of NH3 entering the carriers is good so that the conversion efficiency of NOX in exhausted gas can be improved, and the leakage amount of NH3 is lowered. The content of NOX in the exhausted gas is effectively lowered, and it is guaranteed that the SCR system meets the fifth-stage emission requirement of commercial vehicles.
Description
Technical field
The invention belongs to vehicle maintenance service technical field, refer to a kind of automotive SCR system especially.
Background technique
Along with the public is to pollution of atmosphere growing interest, and the enforcement of commercial car fourth stage emission request, original vehicle exhaust post-processing technology can not meet new standard, needs to seek new post-processing technology.
SCR (SelectiveCatalyticReduction, selective catalytic reduction catalyst) is one of reprocessing mainstream technology of enforcement state four discharge of generally acknowledging at present.In diesel engine exhaust system, install urea SCR device, this device sprays into a certain amount of aqueous solution of urea in outlet pipe.Aqueous solution of urea obtains NH through pervaporation, pyrolysis and hydrolysis in outlet pipe
3, NH
3reducing agent, it under the effect of uniform temperature and catalyzer by NO
xbe reduced to N
2, thus reduce NO in waste gas
xcontent.
Numerous source investigation shows, is injected to the aqueous solution of urea in pipeline and NH
3the uniformity of distribution is to SCR system NO
xconversion efficiency and engine performance have important impact.If NH3 skewness, at NH
3too much region, NH
3except participation reaction, also have residue, produce NH
3leak, cause secondary pollution.At NH
3very few region, owing to participating in the NH of reaction
3very few, cause NO
xconversion efficiency is low.It is uneven that aqueous solution of urea enters gas exhaust piping, the high position of concentration of aqueous solution of urea due to temperature low, can crystalline polamer be produced.This can cause gas exhaust piping to block, and exhaust back pressure increases, and engine performance declines.
At present in diesel engine SCR apparatus, urea injector is adopted to be injected in outlet pipe by aqueous solution of urea.In order to make aqueous solution of urea mix in outlet pipe, general employing strengthens the measure such as jet pressure, reduction nozzle hole area increases aqueous solution of urea fogging degree, increases the distributing homogeneity of aqueous solution of urea.
Adopt this technological scheme, have following shortcoming: adopt the urea-spray device that jet pressure is high, add cost.Although reduce nozzle hole area to add aqueous solution of urea fogging degree, be conducive to mixing, less nozzle hole area adds difficulty of processing, processing cost, and easily causes spray orifice to block, and causes urea-spray failure of apparatus.
Although adopt this technology can increase the degree of mixing of aqueous solution of urea to a certain extent, reduce the probability that crystallization occurs, aqueous solution of urea uniformity is good not, enters the NH of carrier
3distribution is even not, and the probability that crystallization occurs is still larger.
Summary of the invention
The object of this invention is to provide a kind of mixing arrangement, aqueous solution of urea can be made to mix with exhaust in outlet pipe inside by this device more even, and the NH entering carrier inside can be made
3be evenly distributed, thus improve NO
xconversion efficiency, and reduce the generation of outlet pipe internal crystallization phenomenon, reduce NH
3leakage rate.
The present invention is achieved by the following technical solutions:
A kind of automotive SCR system, includes catalyst converter, outlet pipe, ammonia mixer and aqueous solution of urea mixer;
One end of described outlet pipe is connected with the relief opening of motor, and the other end connects with the suction port of described catalyst converter;
Described outlet pipe is provided with urea injector fitting seat; Described urea injector fitting seat is provided with mounting hole; Described mounting hole is communicated with described outlet pipe;
In described outlet pipe, described mounting hole and described outlet pipe connectivity part are provided with described aqueous solution of urea mixer;
Described ammonia mixer is arranged in described catalyst converter near described suction port place.
Described catalyst converter includes catalyst converter housing and is arranged at the carrier in described catalyst converter housing.
At described outlet pipe, described catalyst converter suction port place is provided with exhaust gas temperature sensor and bore is installed.
The angle of the center line of the mounting hole on described urea injector fitting seat and the center line of described outlet pipe is acute angle.
Described catalyst converter air outlet is provided with NO
xsensor installation seat hole.
Described aqueous solution of urea mixer includes five transverse slats and six risers; Five described transverse slats and six described risers intersect the structure being fixedly connected to form mesh;
Each described riser is provided with multiple wing plate, and each described wing plate is corresponding with a described mesh; Each described wing plate is equal with the angle of angle between described riser;
The described wing plate direction be positioned on the described riser corresponding to same horizontally-arranged mesh is identical, and contrary with the described wing plate direction on the described riser corresponding to the mesh of adjacent rows.
Described ammonia mixer includes a hemispheric housing; The circular hole arranged on the housing; Described circular hole has five layers from the center of described housing to edge; The edge of described housing is fixedly connected with described catalyst converter inner walls.
The invention has the beneficial effects as follows:
The present invention passes through the setting of aqueous solution of urea mixer and ammonia mixer, solves in automotive SCR system, and aqueous solution of urea sprays into the lack of homogeneity of outlet pipe and enters carrier NH
3the problem of the lack of homogeneity of concentration.And ammonia mixer structure, adds NH
3the uniformity of concentration; NH
3when entering carrier, uniformity is good, can improve NO in exhaust
xconversion efficiency, reduce NH
3amount of leakage; Significantly reduce the NO in exhaust
xcontent, ensure that SCR system meets commercial car fourth stage emission request.
Accompanying drawing explanation
Fig. 1 is automotive SCR system structural representation of the present invention;
Fig. 2 is aqueous solution of urea mixer worm's eye view;
Fig. 3 is aqueous solution of urea mixer side view;
Fig. 4 is ammonia mixer plan view;
Fig. 5 is ammonia mixer side view.
Description of reference numerals
1NO
xsensor installation seat hole, 2 catalyst converters, 3 carriers, 4 ammonia mixers, 5 exhaust gas temperature sensors install bore, 6 outlet pipes, 7 aqueous solution of urea mixers, 8 urea injector fitting seats, 71 risers, 72 transverse slats, 73 left wing plates, 74 right wing plates, 75 mesh, 41 housings, 42 circular holes.
Embodiment
Describe technological scheme of the present invention in detail by the following examples, following embodiment is only exemplary, only can be used for explaining and technological scheme of the present invention being described, and can not be interpreted as being the restriction to technical solution of the present invention.
The invention provides a kind of automotive SCR system, as shown in Figures 1 to 5, include catalyst converter 2, outlet pipe 6, ammonia mixer 4 and aqueous solution of urea mixer 7; Described catalyst converter 2 includes catalyst converter housing and is arranged at the carrier 3 in described catalyst converter housing.
Described one end of outlet pipe 6 is connected with the relief opening of motor, and the other end connects with the suction port of described catalyst converter; Waste gas right side from Fig. 1 that motor is discharged enters outlet pipe.
Described outlet pipe 6 is provided with urea injector fitting seat 8; Described urea injector fitting seat 8 is provided with mounting hole; Described mounting hole is communicated with described outlet pipe; In the present embodiment, the angle of the center line of described mounting hole and the center line of described outlet pipe is 40 degree of angles, and urea injector is arranged in mounting hole.
In described outlet pipe, described mounting hole and described outlet pipe connectivity part are provided with described aqueous solution of urea mixer 7;
Described ammonia mixer 4 is arranged in described catalyst converter near described suction port place.
At described outlet pipe, described catalyst converter suction port place is provided with exhaust gas temperature sensor and bore 5 is installed.Exhaust gas temperature sensor is arranged on exhaust gas temperature sensor and installs in bore, for measuring temperature herein, prevents the low and crystalline polamer of the low catalyst converter transformation efficiency caused of delivery temperature.
Described catalyst converter air outlet is provided with NO
xsensor installation seat hole 1.NO
xsensor is arranged on NO
xin sensor installation seat hole, for detecting the NO do not reacted in waste gas
xconcentration, and feed back to ECU in time, prevent NO in exhaust
xexcessive concentration.
Described aqueous solution of urea mixer 7 includes five transverse slats 72 and six risers 71; Five described transverse slats and six described risers intersect the structure being fixedly connected to form mesh 75;
Each described riser 71 is provided with multiple wing plate, one end and the riser of wing plate are structure as a whole, and the other end is to a lateral buckling of riser, and the overbending direction of adjacent two wing plates is different, what bend on the left of riser is left wing plate 73, and what bend on the right side of riser is right wing plate 74; Each described wing plate is corresponding with a described mesh; Each described wing plate is equal with the angle of angle between described riser, in the present embodiment, is miter angle;
The described wing plate direction be positioned on the described riser corresponding to same horizontally-arranged mesh is identical, and contrary with the described wing plate direction on the described riser corresponding to the mesh of adjacent rows.
After aqueous solution of urea sprays from urea injector, enter aqueous solution of urea mixer, continue to flow to catalyst converter direction after aqueous solution of urea mixes with waste gas; Aqueous solution of urea produces evaporation, pyrolysis and hydrolysis in outlet pipe inside, produces NH
3, NH
3nH is entered with exhaust mixed gas
3mixer.
Described ammonia mixer 4 comprises a hemispheric housing 41; Described housing is arranged along described catalyst converter casing centerline direction; The edge of described housing is all fixedly connected by welding with described catalyst converter inner walls; Each described housing is provided with circular hole 42, and in the present embodiment, Circularhole diameter is 7.8mm.
Described circular hole has five layers from the center of described housing to edge, is five circle circular holes, each circle circular hole the center of circle be all positioned at casing center be the center of circle concentric circumferences on.
NH
3with exhaust mixed gas at NH
3enter in the carrier of catalyst converter inside after mixing in mixer, under uniform temperature and catalyst action, NH
3with NO
xthere is chemical reaction, generate N
2and H
2o.The gas produced after reaction and the gas etc. do not reacted flow out from carrier outlet.
The present invention mainly solves in automotive SCR system, and aqueous solution of urea sprays into the lack of homogeneity of outlet pipe and enters carrier NH
3the lack of homogeneity of concentration.Main device comprises aqueous solution of urea mixer and NH3 mixer.
Aqueous solution of urea is after urea injector ejection, enter aqueous solution of urea mixer, outlet pipe cross section is divided into the space of much little mesh by this mixer by the combination of sheet metal, in each little space, aqueous solution of urea mixes with exhaust, adds the mixability of aqueous solution of urea and exhaust.Aqueous solution of urea and exhaust mixture continue to flow backward, run into the guide functions of wing plate, further increase the degree of mixing of aqueous solution of urea and exhaust.Avoid aqueous solution of urea to concentrate and be ejected into certain region, avoid high at the urea concentration in certain region, temperature is on the low side, thus is greatly reduced in the probability producing crystalline polamer in outlet pipe.Ensure that engine exhaust back pressure is normal, engine performance is normal.
Aqueous solution of urea through pervaporation, pyrolysis and hydrolysis, produces reducing agent NH in outlet pipe
3.NH
3after entering catalyst converter housing from outlet pipe, due to the changes of section of catalyst converter housing forward end expanding duct, NH can be caused
3cONCENTRATION DISTRIBUTION is uneven.NH
3mixer comprises inside and outside five layers of circular hole, NH
3flow through in circular hole with exhaust mixed gas, in each circular hole, NH
3mix with exhaust, add NH
3the uniformity of concentration.NH
3when entering carrier, uniformity is good, can improve NO in exhaust
xconversion efficiency, reduce NH
3amount of leakage.Significantly reduce the NO in exhaust
xcontent, ensure that SCR system meets commercial car fourth stage emission request.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.
Claims (7)
1. an automotive SCR system, is characterized in that: include catalyst converter, outlet pipe, ammonia mixer and aqueous solution of urea mixer;
One end of described outlet pipe is connected with the relief opening of motor, and the other end connects with the suction port of described catalyst converter;
Described outlet pipe is provided with urea injector fitting seat; Described urea injector fitting seat is provided with mounting hole; Described mounting hole is communicated with described outlet pipe;
In described outlet pipe, described mounting hole and described outlet pipe connectivity part are provided with described aqueous solution of urea mixer;
Described ammonia mixer is arranged in described catalyst converter near described suction port place.
2. automotive SCR system according to claim 1, is characterized in that: described catalyst converter includes catalyst converter housing and is arranged at the carrier in described catalyst converter housing.
3. automotive SCR system according to claim 1, is characterized in that: at described outlet pipe, described catalyst converter suction port place is provided with exhaust gas temperature sensor and installs bore.
4. automotive SCR system according to claim 1, is characterized in that: the angle of the center line of the mounting hole on described urea injector fitting seat and the center line of described outlet pipe is acute angle.
5. automotive SCR system according to claim 1, is characterized in that: on described catalyst converter air outlet, be provided with NO
xsensor installation seat hole.
6. automotive SCR system according to claim 1, is characterized in that: described aqueous solution of urea mixer includes five transverse slats and six risers; Five described transverse slats and six described risers intersect the structure being fixedly connected to form mesh;
Each described riser is provided with multiple wing plate, and each described wing plate is corresponding with a described mesh; Each described wing plate is equal with the angle of angle between described riser;
The described wing plate direction be positioned on the described riser corresponding to same horizontally-arranged mesh is identical, and contrary with the described wing plate direction on the described riser corresponding to the mesh of adjacent rows.
7. automotive SCR system according to claim 1, is characterized in that: described ammonia mixer includes a hemispheric housing; The circular hole arranged on the housing; Described circular hole has five layers from the center of described housing to edge; The edge of described housing is fixedly connected with described catalyst converter inner walls.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510555708.8A CN105041433B (en) | 2015-09-01 | 2015-09-01 | A kind of automotive SCR system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510555708.8A CN105041433B (en) | 2015-09-01 | 2015-09-01 | A kind of automotive SCR system |
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| Publication Number | Publication Date |
|---|---|
| CN105041433A true CN105041433A (en) | 2015-11-11 |
| CN105041433B CN105041433B (en) | 2018-04-13 |
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ID=54448346
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510555708.8A Active CN105041433B (en) | 2015-09-01 | 2015-09-01 | A kind of automotive SCR system |
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|---|---|
| CN (1) | CN105041433B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105402009A (en) * | 2015-12-17 | 2016-03-16 | 无锡威孚力达催化净化器有限责任公司 | Spiral mixer for integrated injection of SCR catalyst |
| CN106948913A (en) * | 2017-03-27 | 2017-07-14 | 安徽江淮汽车集团股份有限公司 | A kind of exhaust gas processing device and blast pipe for being convenient to clean urea crystals thing |
| CN106968765A (en) * | 2017-05-04 | 2017-07-21 | 安徽江淮汽车集团股份有限公司 | A kind of diesel urea mixing arrangement |
| CN107152355A (en) * | 2016-03-02 | 2017-09-12 | 福特环球技术公司 | Blender for mixing exhaust |
| CN107461239A (en) * | 2016-06-03 | 2017-12-12 | 天纳克（苏州）排放系统有限公司 | Hybrid chamber component |
| CN109915241A (en) * | 2017-12-13 | 2019-06-21 | 北汽福田汽车股份有限公司 | Flow apron, oxidation catalyzer and vehicle |
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| CN201818352U (en) * | 2010-10-29 | 2011-05-04 | 包头北奔重型汽车有限公司 | Exhaust pipe with function of mixing urea with exhausted smoke |
| CN102094699A (en) * | 2010-12-15 | 2011-06-15 | 杭州银轮科技有限公司 | Static mixer for diesel engine urea selective catalytic reduction device |
| CN102410069A (en) * | 2011-11-24 | 2012-04-11 | 杭州银轮科技有限公司 | SCR (Selective Catalytic Reduction) catalytic conversion muffler |
| CN102444453A (en) * | 2011-12-14 | 2012-05-09 | 杭州银轮科技有限公司 | Static mixer for exhaust system |
| CN204436541U (en) * | 2014-12-31 | 2015-07-01 | 张辉 | A kind of diesel engine selective catalytic reduction after-treatment device |
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2015
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201818352U (en) * | 2010-10-29 | 2011-05-04 | 包头北奔重型汽车有限公司 | Exhaust pipe with function of mixing urea with exhausted smoke |
| CN102094699A (en) * | 2010-12-15 | 2011-06-15 | 杭州银轮科技有限公司 | Static mixer for diesel engine urea selective catalytic reduction device |
| CN102410069A (en) * | 2011-11-24 | 2012-04-11 | 杭州银轮科技有限公司 | SCR (Selective Catalytic Reduction) catalytic conversion muffler |
| CN102444453A (en) * | 2011-12-14 | 2012-05-09 | 杭州银轮科技有限公司 | Static mixer for exhaust system |
| CN204436541U (en) * | 2014-12-31 | 2015-07-01 | 张辉 | A kind of diesel engine selective catalytic reduction after-treatment device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105402009A (en) * | 2015-12-17 | 2016-03-16 | 无锡威孚力达催化净化器有限责任公司 | Spiral mixer for integrated injection of SCR catalyst |
| CN107152355A (en) * | 2016-03-02 | 2017-09-12 | 福特环球技术公司 | Blender for mixing exhaust |
| CN107461239A (en) * | 2016-06-03 | 2017-12-12 | 天纳克（苏州）排放系统有限公司 | Hybrid chamber component |
| CN106948913A (en) * | 2017-03-27 | 2017-07-14 | 安徽江淮汽车集团股份有限公司 | A kind of exhaust gas processing device and blast pipe for being convenient to clean urea crystals thing |
| CN106948913B (en) * | 2017-03-27 | 2018-12-14 | 安徽江淮汽车集团股份有限公司 | A kind of exhaust gas processing device and exhaust pipe being convenient to clean urea crystals object |
| CN106968765A (en) * | 2017-05-04 | 2017-07-21 | 安徽江淮汽车集团股份有限公司 | A kind of diesel urea mixing arrangement |
| CN109915241A (en) * | 2017-12-13 | 2019-06-21 | 北汽福田汽车股份有限公司 | Flow apron, oxidation catalyzer and vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105041433B (en) | 2018-04-13 |
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Address after: 230601 Anhui Province, Hefei City Industrial Park, the Peach Blossom Road No. 669 Applicant after: Anhui Jianghuai Automobile Group Limited by Share Ltd Address before: 230601 Anhui Province, Hefei City Industrial Park, the Peach Blossom Road No. 669 Applicant before: Anhui Jianghuai Automotive Co., Ltd. |
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