CN202012386U - Mixing device for urea SCR system of diesel engine - Google Patents
Mixing device for urea SCR system of diesel engine Download PDFInfo
- Publication number
- CN202012386U CN202012386U CN2010206604430U CN201020660443U CN202012386U CN 202012386 U CN202012386 U CN 202012386U CN 2010206604430 U CN2010206604430 U CN 2010206604430U CN 201020660443 U CN201020660443 U CN 201020660443U CN 202012386 U CN202012386 U CN 202012386U
- Authority
- CN
- China
- Prior art keywords
- nozzle
- fin
- mixer
- scr system
- urea scr
- 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 - Lifetime
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/21—Mixing gases with liquids by introducing liquids into gaseous media
- B01F23/213—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
- B01F23/2132—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids using nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
-
- 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
- B01F2025/91—Direction of flow or arrangement of feed and discharge openings
- B01F2025/916—Turbulent flow, i.e. every point of the flow moves in a random direction and intermixes
Abstract
The utility model discloses a mixing device for a urea SCR (Selective Catalytic Reduction) system of a diesel engine, comprising a tube body, a mixer fin device and a nozzle, wherein the nozzle is disposed on the central axis of the tube body; the mixer fin device is next to the nozzle and installed at the front end of the nozzle; the mixer fin device is composed of a group of fins; the fin body is a fan-shaped structure twisted along an airflow direction, the arrangement direction thereof is as the same as that of a spray axis, and a group of slanted flow guide sheets is disposed in every fin. The device of the utility model guides airflow to flow towards a centre along the fin direction via the mixer fin device and forms a strong turbulent flow at a fan-shaped central end to promote the atomization and mixing of the spray at the nozzle outlet, so that urea aqueous solution and tail gas injected from the nozzle can be adequately mixed before entering into a SCR catalyst, and the crystallization of urea on a wall surface is reduced; the device is compactly structured and easy to process and install; the effect of the device is verified via the calculation and analysis of special design software.
Description
Technical field
The utility model patent relates to diesel exhaust aftertreatment system field, relates to a kind of mixing arrangement that is used for diesel urea SCR system in particular.
Background technique
Along with countries in the world are more and more stricter to the requirement of diesel emission, diesel particulate (PM) and NO
XEmission control becomes the key technology of diesel engine development.Current two different routes of diesel exhaust aftertreatment technology existence that satisfy China state IV emission regulation demands at diesel engine: one is the NOx discharging that reduces the engine cylinder internal combustion by exhaust gas recirculation (EGR) technology, uses diesel engine particles catcher (DPF) control PM then; Another is the PM discharging that reduces the engine cylinder internal combustion by fuel oil high-pressure injection technology, then with selecting catalytic reduction technology (SCR) control NOx.Studies show that in a large number: state IV diesel engine using SCR technology is than adopting EGR to add particle trap technology oil consumption low about 5%.The SCR technology makes the carbon dioxide content minimum in the exhaust, uses the negative effect minimum of the state IV diesel engine of SCR technology to environment.When selecting the SCR technology path to realize state IV, have reliability height, good stability, fuel consumption is low, specific power is high, anti-sulphur is good, the drain period long, heat radiation requires advantages such as low, and when more high-grade upgrading, SCR is easier than EGR technology.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.; Finished 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.Though the urea SCR system is just worldwide by promotion and application, but it is to be solved to still have a lot of problems to have, for example: how to improve the transformation efficiency of NOx during low temperature, how to reduce sediments and generate, mixes low and ammonia leakage of transformation efficiency that factor such as inhomogeneous causes or the like.
Studies show that in a large number 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 in spray effect the poorest jet expansion zone and the easy spraying that crystallization takes place over against the wall place according to the characteristics of spray discharge pattern, the mixed effect of mixer will be better so.
Summary of the invention
Of the present utility model is a kind of mixing arrangement that is used for diesel urea SCR system, its objective is: according to the characteristic of spraying, by air motion in the mixer rationalization outlet pipe, place and the easy spraying that crystallization take place the poorest in the jet expansion spraying form strong flow-disturbing 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:
A kind of mixing arrangement that is used for diesel urea SCR system, comprise body, mixer tab arrangement and nozzle, it is characterized in that described nozzle is arranged on the body central axis, described mixer tab arrangement is near nozzle and be installed in spray nozzle front end, described mixer tab arrangement is made up of one group of fin, the sector structure of described fin main body for reversing along airflow direction, its arranged direction is consistent with the spray axis direction, is provided with one group of inclination guide plate in described each fin.
The utility model by mixer tab arrangement steering flow along the fin direction to center flow, and, by inclination guide plate steering flow whole bundle is sprayed simultaneously and mix in atomizing and mixing that the strong flow-disturbing promotion nozzle exit of fan-shaped center-side (nozzle spray outlet port) formation is sprayed.Therefore, the utility model not only can reduce the crystallization of urea at wall so that the aqueous solution of urea of nozzle ejection and tail gas were mixed fully before entering the SCR catalyst converter, simultaneously compact structure, be easy to processing and installation, its effect is verified through the computational analysis of special designs software.
As further improvement of the utility model, the guide plate direction of close outlet pipe wall is towards the exhaust wall direction, steering flow forms the mixing that strong flow-disturbing promotes tube wall place aqueous solution of urea at the tube wall place, remaining guide plate slightly tilts towards the central position, the form fluid passage, steering flow mixes whole bundle spraying simultaneously.
According to the utility model, described body one end links to each other with exhaust duct by adpting flange, and the other end links to each other with rear end pipeline or catalyst converter.Thereby the utility model can link to each other with exhaust duct by dismountable mode.
According to the utility model, 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 allow aqueous solution of urea and tail gas mix fully.
According to the utility model, described fluid passage is 3-8 according to the nozzle nozzle hole number, preferred 4-6, and evenly be provided with.
The utility model is used for the mixing arrangement of diesel urea SCR system, and described body adopts 304 above stainless steel materials to make.
Description of drawings
Fig. 1 is a diesel exhaust aftertreatment SCR system schematic.
Fig. 2 is a diesel exhaust gas pipeline system construction drawing.
Fig. 3 is the utility model mixer front view.
Fig. 4 is the utility model mixer plan view.
Fig. 5 is the structural representation of the utility model tab arrangement.
Fig. 6 the utility model 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, for the inclination guide plate, 12, fin, 13, the fluid passage, 14, central fluid channel, 15, spray discharge pattern.
Embodiment
Contrast accompanying drawing below, by description to embodiment, to embodiment of the present utility model, 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 utility model, utilize mixer to gas flow channeling conduct in the automobile exhaust pipe, on nozzle exit and spray axis direction, form strong flow-disturbing, 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. 3, the static mixer of diesel urea selective catalytic reduction device of the present utility model, comprise body 2, mixer tab arrangement 3 and nozzle 4, described nozzle 4 is arranged on the body 2, 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 by adpting flange 1,9 respectively.Described nozzle 4 is arranged on the downstream of body 3.
With reference to Fig. 4, Fig. 5, mixer fin 3 devices are made up of 4 fins 12, the sector structure of fin 12 main bodys for reversing along airflow direction, by this structure steering flow along the fin direction to center flow, and form atomizing and the mixing that strong flow-disturbing promotes the nozzle exit spraying in fan-shaped center-side (nozzle spray outlet port); Fin 12 arranged direction are consistent with the spray axis direction, in fin 12, drive a plurality of inclination guide plates 11, wherein guide plate 11 directions of close outlet pipe wall are towards the exhaust wall direction, steering flow forms the mixing that strong flow-disturbing promotes tube wall place aqueous solution of urea at the tube wall place, remaining guide plate 11 slightly tilts towards the central position, form fluid passage 13, steering flow mixes whole bundle spraying simultaneously.
4 fins 12 of described mixer tab arrangement 3 are welded on the body 2.Form 4 flow channel area between 4 fins 12 and the tube wall, and radially evenly distribute.Each flow channel area is separated into a plurality of fluid passages 13 by one group of inclination guide plate 11 again, and described fluid passage 13 is axially consistent with spraying.Simultaneously, a central fluid channel 14 is enclosed in 4 fins 12 end of being positioned at central axis.
Described body 2 adopts 304 above stainless steel materials to make.
Above-mentionedly in conjunction with the accompanying drawings the utility model has been carried out exemplary description, but specific implementation of the present utility model is not subjected to the restriction of aforesaid way.As long as adopted the improvement of the various unsubstantialities that design of the present utility model and technological scheme carry out, or design of the present utility model and technological scheme are directly applied to other occasion, all within protection domain of the present utility model without improving.
Adopt the technical solution of the utility model, 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 (6)
1. mixing arrangement that is used for diesel urea SCR system, comprise body (2), mixer tab arrangement (3) and nozzle (4), it is characterized in that described nozzle (4) is arranged on the body central axis, described mixer tab arrangement (3) is near nozzle (4) and be installed in nozzle (4) front end, described mixer tab arrangement (3) is made up of one group of fin (12), the sector structure of described fin (12) main body for reversing along airflow direction, its arranged direction is consistent with the spray axis direction, is provided with one group of inclination guide plate (11) in described each fin (12).
2. the mixing arrangement that is used for diesel urea SCR system as claimed in claim 1 is characterized in that described fin (12) is 3-8.
3. the mixing arrangement that is used for diesel urea SCR system as claimed in claim 1 is characterized in that described mixer tab arrangement (3) evenly distributes.
4. as any one described mixing arrangement that is used for diesel urea SCR system of claim 1-3, it is characterized in that described one group of inclination guide plate (11), wherein guide plate (11) direction near the outlet pipe wall slightly tilts form fluid passage (13) towards the central position towards remaining guide plate of exhaust wall direction (11).
5. the mixing arrangement that is used for diesel urea SCR system as claimed in claim 4 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 by adpting flange (1,9) respectively.
6. the mixing arrangement that is used for diesel urea SCR system as claimed in claim 5 is characterized in that described mixer tab arrangement (3) is welded on the body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206604430U CN202012386U (en) | 2010-12-15 | 2010-12-15 | Mixing device for urea SCR system of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206604430U CN202012386U (en) | 2010-12-15 | 2010-12-15 | Mixing device for urea SCR system of diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202012386U true CN202012386U (en) | 2011-10-19 |
Family
ID=44782998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206604430U Expired - Lifetime CN202012386U (en) | 2010-12-15 | 2010-12-15 | Mixing device for urea SCR system of diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202012386U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102085453A (en) * | 2010-12-15 | 2011-06-08 | 杭州银轮科技有限公司 | Mixing device for diesel engine urea SCR system |
| WO2015119617A1 (en) * | 2014-02-07 | 2015-08-13 | Faurecia Emissions Control Technologies, Usa, Llc | Mixer assembly for a vehicle exhaust system |
| WO2017084548A1 (en) * | 2015-11-19 | 2017-05-26 | 天纳克（苏州）排放系统有限公司 | Exhaust aftertreatment system for engine |
| US10287948B1 (en) | 2018-04-23 | 2019-05-14 | Faurecia Emissions Control Technologies, Usa, Llc | High efficiency mixer for vehicle exhaust system |
| US10316721B1 (en) | 2018-04-23 | 2019-06-11 | Faurecia Emissions Control Technologies, Usa, Llc | High efficiency mixer for vehicle exhaust system |
| US10787946B2 (en) | 2018-09-19 | 2020-09-29 | Faurecia Emissions Control Technologies, Usa, Llc | Heated dosing mixer |
-
2010
- 2010-12-15 CN CN2010206604430U patent/CN202012386U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102085453A (en) * | 2010-12-15 | 2011-06-08 | 杭州银轮科技有限公司 | Mixing device for diesel engine urea SCR system |
| CN102085453B (en) * | 2010-12-15 | 2012-11-14 | 杭州银轮科技有限公司 | Mixing device for diesel engine urea SCR system |
| WO2015119617A1 (en) * | 2014-02-07 | 2015-08-13 | Faurecia Emissions Control Technologies, Usa, Llc | Mixer assembly for a vehicle exhaust system |
| US10337379B2 (en) | 2014-02-07 | 2019-07-02 | Faurecia Emissions Control Technologies, Usa, Llc | Mixer assembly for a vehicle exhaust system |
| WO2017084548A1 (en) * | 2015-11-19 | 2017-05-26 | 天纳克（苏州）排放系统有限公司 | Exhaust aftertreatment system for engine |
| US10287948B1 (en) | 2018-04-23 | 2019-05-14 | Faurecia Emissions Control Technologies, Usa, Llc | High efficiency mixer for vehicle exhaust system |
| US10316721B1 (en) | 2018-04-23 | 2019-06-11 | Faurecia Emissions Control Technologies, Usa, Llc | High efficiency mixer for vehicle exhaust system |
| US10787946B2 (en) | 2018-09-19 | 2020-09-29 | Faurecia Emissions Control Technologies, Usa, Llc | Heated dosing mixer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20111019 Effective date of abandoning: 20130227 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20111019 Effective date of abandoning: 20130227 |
|
| RGAV | Abandon patent right to avoid regrant |