CN102022165B - Hybrid unit of SCR (selective catalytic reduction) system for vehicle urea - Google Patents
Hybrid unit of SCR (selective catalytic reduction) system for vehicle urea Download PDFInfo
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- CN102022165B CN102022165B CN2010105882908A CN201010588290A CN102022165B CN 102022165 B CN102022165 B CN 102022165B CN 2010105882908 A CN2010105882908 A CN 2010105882908A CN 201010588290 A CN201010588290 A CN 201010588290A CN 102022165 B CN102022165 B CN 102022165B
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- nozzle
- rib
- fin
- hybrid unit
- urea
- Prior art date
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 239000004202 carbamide Substances 0.000 title claims abstract description 39
- 238000010531 catalytic reduction reaction Methods 0.000 title abstract description 3
- 239000012530 fluid Substances 0.000 claims abstract description 12
- 238000009434 installation Methods 0.000 claims abstract description 4
- 239000007921 spray Substances 0.000 claims description 26
- 238000002156 mixing Methods 0.000 claims description 11
- 239000003054 catalyst Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 9
- 238000002425 crystallisation Methods 0.000 abstract description 6
- 230000008025 crystallization Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 2
- 230000003197 catalytic effect Effects 0.000 abstract 1
- 238000005507 spraying Methods 0.000 description 14
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 5
- 238000012805 post-processing Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000005373 pervaporation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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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
-
- 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
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a hybrid unit of an SCR (selective catalytic reduction) system for vehicle urea, comprising a pipe body, a hybrid unit rib device and a nozzle, wherein the nozzle is aslant arranged on the wall surface of the pipe body; the hybrid unit rib device tightly abuts against the nozzle and is installed on the front end of the nozzle; the hybrid unit rib device comprises four ribs, the middle of the first rib and the second rib forms a fluid path similar to an atomizing pattern; the first rib and the second rib have certain gradient and twists towards the central area; the third rib has a baffle-shaped structure and is arranged near the pipe wall, the installation direction is vertical to the atomizing axis, and the third rib twists towards the wall surface; and the fourth rib is arranged along the atomizing axis direction and is composed of a group of blades alternately twisted left and right. The invention can bring the effect that a urea aqueous solution injected by the nozzle and tail gas are fully mixed before entering an SCR catalytic converter, thus reducing urea crystallization formed on the wall surface; and meanwhile, the hybrid unit has compact structure and is easy to process and install, and the effect of the hybrid unit is verified.
Description
Technical field
Patent of the present invention relates to diesel exhaust aftertreatment system field, relates to the mixing arrangement of a kind of automobile-used urea SCR system in particular.
Background technique
SCR (SCR) is that the minimizing Diesel NOx of generally acknowledging is at present discharged the most effectively one of post-processing technology, also is considered to meet most one of post-processing technology China's actual conditions, that can satisfy state IV emission request.Urea SCR is through spraying into the certain amount of urea aqueous solution in outlet pipe, aqueous solution of urea obtains reducing agent NH through pervaporation, pyrolysis and hydrolytic process again
3, NH
3Under the effect of catalyzer, optionally NOx is reduced into N
2Thereby realization reduces the content of NOx in the exhaust.The urea SCR post-processing technology is used the several years in Europe, is the mainstream technology route that Europe solves Europe IV/V emission request; In order to satisfy strict more EPA2010, most manufacturers of engines have been brought into use the SCR post-processing technology in the U.S.; Accomplished the urea SCR system that satisfies state IV Abgasgesetz in China main motor enterprise, and had increasing lift-launch SCR after-treatment system to satisfy the bus of state IV on Beijing, Shanghai and other places.
The urea SCR system of extensive use at present mainly is divided into two types: air-assisted injection system and no air-assisted injection system.The general nozzle of the auxiliary SCR system of air is installed in the outlet pipe center; Aqueous solution of urea vertically sprays around exhaust wall compressed-air actuated assisting down, and it is better relatively under the air booster action, to atomize, and is difficult for forming crystallization; But many one road pressurized air, system architecture is complicated; The electromagnetic valve type nozzle is generally installed at tube wall by the auxiliary SCR system of no air, sprays from exhaust wall one end along several angle towards the outlet pipe the other end, and this system global structure is simple, but atomizing and mixed effect are relatively poor, form urea crystals easily.
Big quantity research shows that mixer can make the urea spray droplet mix with exhaust more fully; Improve mixing uniformity, accelerate the evaporation of urea droplets, promote the decomposition of urea; Forming uniform ammonia distributes; Thereby improve the transformation efficiency of NOx, reduce the growing amount of urea deposits thing under the low temperature, reduce ammonia and leak.Mixer design should be considered the characteristics of aqueous solution of urea spray discharge pattern; If mixer design can form strong flow-disturbing with the spraying that crystallization takes place easily over against the wall place in the poorest jet expansion zone of spray effect according to the characteristics of spray discharge pattern, the mixed effect of mixer will be better so.
Summary of the invention
What the present invention will solve is the above-mentioned defective that existing technology exists; Its objective is: to the auxiliary SCR system of no air; Spraying sprays to the form of the other end along exhaust wall one end; According to the characteristic of spraying, through air motion in the mixer rationalization outlet pipe, the place the poorest in the jet expansion spraying forms strong flow-disturbing with the spraying that crystallization takes place easily over against the wall place; Promote the mixed effect of reducing agent ammonia, the transformation efficiency of raising NOx, and reduce sedimental growing amount and ammonia leakage.
For realizing above purpose, the technological scheme that this patent adopts is:
The mixing arrangement of a kind of automobile-used urea SCR system; Comprise body, mixer tab arrangement and nozzle; It is characterized in that described nozzle is tilting on the body wall, described mixer tab arrangement is near nozzle and be installed in spray nozzle front end, and described mixer tab arrangement comprises 4 fins; Wherein: constituted and the similar fluid passage of spray discharge pattern in the middle of first and second fins, described first fin and second fin have certain inclination and reverse towards the center region; The 3rd fin is a baffle plate shape structure, and near the tube wall setting, the direction of installation is vertical with spray axis, reverses towards wall simultaneously; The 4th fin is placed along the spray axis direction, by about one group of blade alternately reversing constitute.
Mixing arrangement of the present invention; Because described first fin and second fin have certain inclination and reverse towards the center region; The fluid conduction in the zone that can arrive not spraying is in the fluid passage; Strengthen the flow strength of spraying place, especially form strong flow-disturbing, promote the even distribution of urea droplets at nozzle exit.The 3rd fin of baffle plate shape, but the wall direction that the past spraying of guide portion fluid faces is mobile, strengthens the mobile distribution with promotion wall urea droplets here, can reduce the wall crystalline polamer simultaneously.By about the 4th fin that constitutes of one group of blade alternately reversing, be used for further mixed atomizing drop.
The present invention not only can be so that the aqueous solution of urea of nozzle ejection and tail gas be mixed before getting into the SCR catalyst converter fully; Reduce the crystallization of urea at wall; Compact structure is easy to processing and installation simultaneously, and its effect obtains checking through the analysis of special designs computed in software.
According to the present invention, described body one end links to each other with exhaust duct through adpting flange, and the other end links to each other with rear end pipeline or catalyst converter.Thereby the present invention can link to each other with exhaust duct through dismountable mode.
According to the present invention, mixer is arranged on spray nozzle front end, has avoided deposition, crystallization on mixer, stops up the problem of exhaust duct.Nozzle location is located at the flow-disturbing active region, can let aqueous solution of urea and tail gas mix fully.
The body of the mixing arrangement of automobile-used urea SCR of the present invention system adopts 304 or 304 above stainless steel materials making.
Description of drawings
Fig. 1 is the auxiliary urea SCR system schematic of no air.
Fig. 2 is a diesel exhaust gas pipeline system construction drawing.
Fig. 3 is the front view of mixer of the present invention.
Fig. 4 is the plan view of mixer of the present invention.
Fig. 5 is the structural representation of mixer tab arrangement of the present invention.
Fig. 6 is spray orifice spray discharge pattern figure.
Among the figure: 1, adpting flange; 2, body; 3, mixer tab arrangement; 4, nozzle; 5, mixer rear end pipeline; 6, catalyst converter; 7, catalyst carrier; 8, pipeline behind the catalyst converter; 9, adpting flange; 10, adpting flange; 11, spray axis; 12, spray discharge pattern; 13, fluid passage.
Embodiment
Contrast accompanying drawing below; Through description to embodiment; Specific embodiments of the invention, for example: the effect of mutual alignment relation between the shape of each structure, structure and the each several part and annexation, each several part and working principle etc. are done further detailed explanation:
A kind of mixing arrangement that is used for diesel urea SCR system of the present invention; Utilize mixer to gas flow channeling conduct in the automobile exhaust pipe; On nozzle exit, spray axis direction, spraying over against the strong flow-disturbing of the place of avoiding formation; Impel aqueous solution of urea to mix with vehicle exhaust better, improve ammonia distributes in the outlet pipe uniformity and NO
XTransformation efficiency, thereby further reduce the content of NOx in the exhaust, can reduce the formation of urea crystals simultaneously.
With reference to Fig. 2, Fig. 3; The static mixer of diesel urea selective catalytic reduction device of the present invention; Comprise body 2, mixer tab arrangement 3 and nozzle 4; Described nozzle 4 is arranged on body 2 tube walls, and spraying sprays to downstream along the upstream extremity of exhaust wall, and described mixer tab arrangement is near nozzle and be installed in spray nozzle front end.Described body 2 two ends link to each other with rear end pipeline 5 with exhaust duct through adpting flange 1,9 respectively.Described nozzle 4 is arranged on the downstream of body 3.
With reference to Fig. 4, Fig. 5; Described mixer tab arrangement 3 mainly is made up of 4 fins; Wherein constituted and the similar fluid passage of spray discharge pattern in the middle of the first fin 3-1 and the second fin 3-2, the fluid conduction that each fin 3-1,3-2 have certain inclination and reverse the zone that arrives with not spraying in towards the center region strengthens the flow strength of spraying place in the fluid passage; Especially form strong flow-disturbing at nozzle exit, promote the even distribution of urea droplets; The 3rd fin 3-3 is a baffle plate shape structure; Be arranged near the tube wall place; The direction of installing is vertical with spray axis 11, reverses towards wall simultaneously, and the guide portion fluid flows toward the wall direction that spraying faces; Strengthen the mobile distribution here, can reduce the wall crystalline polamer simultaneously with promotion wall urea droplets; The 4th fin 3-4 places along spray axis 11 directions, by about one group of blade alternately reversing constitute, be used for further mixed atomizing drop.
Described mixer tab arrangement 3 is welded on the body 2.Described fluid passage is consistent with the spray axis direction.
Said body 2 adopts 304 stainless steel materials to make.
The above-mentioned accompanying drawing that combines has carried out exemplary description to the present invention, but concrete realization of the present invention does not receive the restriction of aforesaid way.As long as adopted the improvement of the various unsubstantialities that design of the present invention and technological scheme carry out, or design of the present invention and technological scheme are directly applied to other occasion, all within protection scope of the present invention without improving.
Adopt technological scheme of the present invention, not only can improve the transformation efficiency of SCR, reduced the formation of urea crystals, can not produce very big pressure drop again so that the aqueous solution of urea of nozzle ejection and vehicle exhaust are mixed fully.
Claims (4)
1. the mixing arrangement of an automobile-used urea SCR system; Comprise body (2), mixer tab arrangement (3) and nozzle (4); It is characterized in that described nozzle (4) is tilting on the body wall; Described mixer tab arrangement (3) is near nozzle (4) and be installed in nozzle (4) front end; Described mixer fin (3) device comprises 4 fins, and wherein: constituted and the similar fluid passage of spray discharge pattern (13) in the middle of first fin (3-1) and second fin (3-2), described first fin (3-1) and second fin (3-2) have certain inclination and reverse towards the center region; The 3rd fin (3-3) is a baffle plate shape structure, and near the tube wall setting, the direction of installation is vertical with spray axis (11), reverses towards wall simultaneously; The 4th fin (3-4) is placed along spray axis (11) direction, by about one group of blade alternately reversing constitute.
2. the mixing arrangement of automobile-used urea SCR as claimed in claim 1 system is characterized in that described body (2) two ends link to each other with rear end pipeline (5) or catalyst converter (6) with exhaust duct through adpting flange (1,9) respectively.
3. the mixing arrangement of automobile-used urea SCR as claimed in claim 1 system is characterized in that described mixer tab arrangement (3) is welded on the body (2).
4. like the mixing arrangement of any one described automobile-used urea SCR system of claim 1-3, it is characterized in that said body (2) adopt 304 and above stainless steel material make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105882908A CN102022165B (en) | 2010-12-15 | 2010-12-15 | Hybrid unit of SCR (selective catalytic reduction) system for vehicle urea |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105882908A CN102022165B (en) | 2010-12-15 | 2010-12-15 | Hybrid unit of SCR (selective catalytic reduction) system for vehicle urea |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102022165A CN102022165A (en) | 2011-04-20 |
| CN102022165B true CN102022165B (en) | 2012-05-23 |
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ID=43863888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105882908A Active CN102022165B (en) | 2010-12-15 | 2010-12-15 | Hybrid unit of SCR (selective catalytic reduction) system for vehicle urea |
Country Status (1)
| Country | Link |
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| CN (1) | CN102022165B (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101220393B1 (en) * | 2011-09-20 | 2013-01-09 | 기아자동차주식회사 | Pump structure for urea scr system |
| CN102337950B (en) * | 2011-09-26 | 2013-03-20 | 杭州银轮科技有限公司 | Vehicle urea SCR (Selective Catalyctic Reduction) system and static mixer thereof |
| CN103573358B (en) * | 2012-08-01 | 2015-11-18 | 北汽福田汽车股份有限公司 | The urea crystals of the SCR exhaust treatment system of motor inspects method |
| DE102013104579B4 (en) * | 2013-05-03 | 2016-12-22 | Eberspächer Exhaust Technology GmbH & Co. KG | INTAKE CHAMBER FOR A CATALYST OF AN EXHAUST CLEANING PLANT |
| US9617892B2 (en) | 2015-07-22 | 2017-04-11 | Caterpillar Inc. | Method and apparatus to reduce urea deposits |
| AT517917B1 (en) * | 2015-10-28 | 2018-06-15 | Avl List Gmbh | MIXING DEVICE FOR AN EXHAUST TREATMENT DEVICE |
| CN107795359B (en) * | 2016-09-07 | 2021-04-02 | 天纳克（苏州）排放系统有限公司 | Mixing chamber assembly |
| CN109236431B (en) * | 2017-07-10 | 2021-03-23 | 河北工业大学 | Detachable spiral-flow type vehicular SCR mixer and nozzle coupling device |
| WO2020143012A1 (en) | 2019-01-11 | 2020-07-16 | Cummins Emission Solutions Inc. | Aftertreatment system with multiple dosing modules |
| CN110541746B (en) * | 2019-09-24 | 2021-03-19 | 河南科技大学 | Diesel engine SCR system and urea spraying and mixing device |
| CN112505235A (en) * | 2020-12-25 | 2021-03-16 | 潍柴动力股份有限公司 | Method, device, equipment and storage medium for determining distribution amount of substances in SCR |
| CN112459879B (en) * | 2020-12-31 | 2024-07-19 | 无锡亿利环保科技有限公司 | U-shaped post-treatment split-flow mixer |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1712756A1 (en) * | 2005-04-15 | 2006-10-18 | Iveco S.p.A. | Mixing module for a fluid in a current of gas |
| CN101900018A (en) * | 2010-07-06 | 2010-12-01 | 清华大学 | Urea mixing arrangement |
| CN201902251U (en) * | 2010-12-15 | 2011-07-20 | 杭州银轮科技有限公司 | Mixing device of automobile-used urea SCR system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11166410A (en) * | 1997-12-04 | 1999-06-22 | Hino Motors Ltd | Exhaust emission control device |
-
2010
- 2010-12-15 CN CN2010105882908A patent/CN102022165B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1712756A1 (en) * | 2005-04-15 | 2006-10-18 | Iveco S.p.A. | Mixing module for a fluid in a current of gas |
| CN101900018A (en) * | 2010-07-06 | 2010-12-01 | 清华大学 | Urea mixing arrangement |
| CN201902251U (en) * | 2010-12-15 | 2011-07-20 | 杭州银轮科技有限公司 | Mixing device of automobile-used urea SCR system |
Non-Patent Citations (1)
| Title |
|---|
| JP特开平11-166410A 1999.06.22 |
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| CN102022165A (en) | 2011-04-20 |
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Denomination of invention: A mixing device for SCR system of vehicle urea Effective date of registration: 20210610 Granted publication date: 20120523 Pledgee: Bank of China Limited by Share Ltd. Tiantai County branch Pledgor: ZHEJIANG YINLUN MACHINERY Co.,Ltd. Registration number: Y2021330000510 |
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Date of cancellation: 20220627 Granted publication date: 20120523 Pledgee: Bank of China Limited by Share Ltd. Tiantai County branch Pledgor: ZHEJIANG YINLUN MACHINERY Co.,Ltd. Registration number: Y2021330000510 |