CN101900018A - Urea mixing device - Google Patents
Urea mixing device Download PDFInfo
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- CN101900018A CN101900018A CN 201010226366 CN201010226366A CN101900018A CN 101900018 A CN101900018 A CN 101900018A CN 201010226366 CN201010226366 CN 201010226366 CN 201010226366 A CN201010226366 A CN 201010226366A CN 101900018 A CN101900018 A CN 101900018A
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- urea
- mixing device
- urea mixing
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- described blade
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Abstract
The invention relates to a urea mixing device, which is characterized by comprising at least two groups of blade pairs, wherein each group of blade pairs comprise two blades of which the folding directions are opposite; and the blades are distributed on the same round section uniformly and are crossed at the circle center of the round section. The device is arranged on the rear end of a urea nozzle in an exhaust pipe; exhausted gases generate violent gas flow disturbance under the turbulent effect of the blades when mixed; strong turbulent flowing motion makes the exhausted gases and atomized urea mixed more uniformly and accelerates the evaporation and decomposition of urea solution; and thus, the NOx conversion efficiency is improved, and ammonia leakage caused by nonuniform ammonia distribution is reduced. Tests show that the NOx conversion efficiency of a urea SCR system having the urea mixing device can be improved by as much as 10 percent.
Description
Technical field
The present invention relates to a kind of urea mixing device,, belong to vehicle exhaust processing and engine exhaust control field particularly about a kind of urea mixing device that is used for Diesel NOx (nitrogen oxide) urea SCR (selection catalytic reduction) system.
Background technique
The urea mixer is a kind of device that is used for the urea SCR system, is mainly used to improve the NOx transformation efficiency of urea SCR system, and reduces sedimental generation.The urea SCR system reduces large diesel engine NOx to discharge one of otherwise effective technique.In the last few years, people constantly solved the variety of issue in using to the progressively intensification of automobile-used urea SCR technical research.Automobile-used urea SCR technology is practicability in Europe, and just worldwide be used more widely.In China, because the diesel oil Sulpher content is higher, the urea SCR technology is good with its sulfur resistance, is considered to the most feasible NOx emission control post-processing technology of large diesel engine.From the 2008 Beijing Olympic Games, Beijing part bus has been used the urea SCR system.Though the urea SCR system is just worldwide promoted, still have some problems to need to solve, such as how improving the NOx transformation efficiency under the low temperature, how to reduce sediments, leak or the like owing to mix the ammonia that factor such as inhomogeneous causes.
Find after deliberation, the urea mixer in the urea SCR system to spraying, the evaporation of urea liquid, decompose and be mixed with very big influence, especially influence is more remarkable when delivery temperature is low.The urea mixer can make the urea spray droplet mix with exhaust more fully, improves mixing uniformity, accelerates the evaporation of urea droplets, promote the decomposition of urea, thereby improve the transformation efficiency of NOx, and reduce the growing amount of urea deposits thing under the low temperature, reduce ammonia and leak.The urea design of Mixer need be considered influence of various factors, not only require the pressure loss little, can improve the NOx transformation efficiency, require also that the processing user cost is low, compact dimensions, easy to process, use the good and material of mechanical endurance flexible for installation, that use corrosion-resistant etc.In general, it is optimum that a urea mixer can not all reach in all fields, should update the urea design of Mixer according to the emphasis of using.Simultaneously, should consider urea mixer and urea nozzle design as a system when design that the spraying of urea mixer and urea cooperatively interacts and just can make mixed effect reach best like this.
Summary of the invention
At above problem, the purpose of this invention is to provide a kind of urea mixing device that is used for Diesel NOx urea SCR system, this urea mixing device can improve the transformation efficiency of NOx when not producing the very big pressure loss, and reduces sedimental growing amount and ammonia leakage.
For achieving the above object, the present invention takes following technological scheme: a kind of urea mixing device is characterized in that: it comprises that at least two group blades are right, the blade of every group of described blade to comprising that two fold directions are oppositely arranged; Described blade is to being distributed on the same circular cross section, and intersects at the center of circle of described circular cross section.
Described blade is that angle is the fan-shaped of 45 °, 60 ° or 90 °.
The angle on each plane, described blade place and plane, described circular cross section place is 50 °～90 °, and is preferably 75 °.
Described blade adopts 304 above stainless steel materials to make, and the thickness of described blade 1 is 1mm～2mm.
Described blade is to being installed in urea nozzle rear end in the outlet pipe of selecting catalyst reduction system by flange.
The present invention is owing to take above technological scheme, it has the following advantages: the present invention is installed in urea nozzle rear end in the outlet pipe, flow-disturbing effect meeting because of blade when the exhaust process is mixed produces strong flow perturbation, strong turbulent motion is mixed more uniformly exhaust and urea spraying, and evaporation, the decomposition of quickening urea liquid, thereby the NOx transformation efficiency is improved, and the ammonia that reduces to cause because of the ammonia skewness leaks.Through verification experimental verification, the NOx transformation efficiency that urea SCR of the present invention system is installed can maximumly improve about 10%.
Description of drawings
Fig. 1 is a front view of the present invention
Fig. 2 is a side view of the present invention
Fig. 3 is user mode figure of the present invention
Embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
As shown in Figure 1 and Figure 2, the present invention includes 8 sectors 1 that are 45 ° of angles, alternately relatively, it is right to form 4 groups of blades altogether successively for the fold direction of each blade 1.4 groups of blades are on the cross section that is distributed in SCR system exhaust pipe 2, and intersect at the center of circle of this cross section.The angle on the plane, cross section place of each blade plane, 1 place and outlet pipe 2 is 75 °, this angle can require to adjust according to different exhaust calibers and different pressures loss, adjustment range is between 50 °～90 °, and the adjustment of angle is the basic demand of geometrical construction so that 1 in blade is interfered.
In the foregoing description, blade 1 adopts 304 above stainless steel materials to make, and the thickness of blade 1 is 1mm～2mm.
In the foregoing description, it is right that blade 1 also can select for use the sector of 6 60 ° of angles to form 3 groups of blades, or the sector of selecting 4 90 ° of angles for use to form 2 groups of blades right, can and require determine the number and the angle of blade 1 according to different service conditions in the middle of actual.
As shown in Figure 3, when the present invention uses, it is welded on the flange 3, and be installed in urea nozzle 4 rear ends in the outlet pipe 2 (mounting distance apart from urea nozzle 4 can be optimized adjustment according to different outlet pipe diameters, form of nozzle etc.), produce strong flow-disturbing when making the spraying of exhaust and urea through blade 1, promote the mixing of exhaust and urea spraying, the decomposition to urea when blade 1 contacts with urea simultaneously has certain promoting effect, has accelerated the decomposition of urea.Can install easily, dismantle by flange 3.
Embodiment:
On a 4.5L diesel engine, test the transformation efficiency of NOx when urea mixing device being installed and urea mixing device not being installed under each operating mode of contrast.Test result shows, urea mixing device is installed under the same operating mode can be improved the about 5%-10% of NOx transformation efficiency.Each operating condition of test is as shown in table 1.
Each operating mode of table 1 comparative trial
The present invention only describes with the foregoing description; the structure of each parts, the position is set and connects and all can change to some extent; on the basis of technical solution of the present invention; all improvement and equivalents of individual component being carried out according to the principle of the invention all should not got rid of outside protection scope of the present invention.
Claims (7)
1. urea mixing device, it is characterized in that: it comprises that at least two group blades are right, the blade of every group of described blade to comprising that two fold directions are oppositely arranged; Described blade is to being distributed on the same circular cross section, and intersects at the center of circle of described circular cross section.
2. a kind of urea mixing device as claimed in claim 1 is characterized in that: described blade is the fan-shaped of 45 °, 60 ° or 90 °.
3. a kind of urea mixing device as claimed in claim 1 is characterized in that: the angle on each plane, described blade place and plane, described circular cross section place is 50 °～90 °, and is preferably 75 °.
4. a kind of urea mixing device as claimed in claim 2 is characterized in that: the angle on each plane, described blade place and plane, described circular cross section place is 50 °～90 °, and is preferably 75 °.
5. as claim 1 or 2 or 3 or 4 described a kind of urea mixing devices, it is characterized in that: described blade adopts 304 above stainless steel materials to make, and the thickness of described blade 1 is 1mm～2mm.
6. as claim 1 or 2 or 3 or 4 described a kind of urea mixing devices, it is characterized in that: described blade is to being installed in urea nozzle rear end in the outlet pipe of selecting catalyst reduction system by flange.
7. a kind of urea mixing device as claimed in claim 5 is characterized in that: described blade is to being installed in urea nozzle rear end in the outlet pipe of selecting catalyst reduction system by flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010226366 CN101900018A (en) | 2010-07-06 | 2010-07-06 | Urea mixing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010226366 CN101900018A (en) | 2010-07-06 | 2010-07-06 | Urea mixing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101900018A true CN101900018A (en) | 2010-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010226366 Pending CN101900018A (en) | 2010-07-06 | 2010-07-06 | Urea mixing device |
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| CN (1) | CN101900018A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102022165A (en) * | 2010-12-15 | 2011-04-20 | 杭州银轮科技有限公司 | Hybrid unit of SCR (selective catalytic reduction) system for vehicle urea |
| 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 |
| CN102337950A (en) * | 2011-09-26 | 2012-02-01 | 杭州银轮科技有限公司 | Vehicle urea SCR (Selective Catalyctic Reduction) system and static mixer thereof |
| CN103883379A (en) * | 2014-04-08 | 2014-06-25 | 武汉理工大学 | SCR system of ship engine |
| CN105715341A (en) * | 2016-02-15 | 2016-06-29 | 东风朝阳朝柴动力环保科技有限公司 | Mixing flow spoiler for selective catalytic reduction system |
| CN106855006A (en) * | 2015-12-08 | 2017-06-16 | 安徽艾可蓝节能环保科技有限公司 | One kind mixing disturbing flow device |
| CN107376645A (en) * | 2017-06-14 | 2017-11-24 | 北京福田戴姆勒汽车有限公司 | Exhaust treatment system |
| CN107376644A (en) * | 2017-06-14 | 2017-11-24 | 北京福田戴姆勒汽车有限公司 | The urea mixed-flow structure of exhaust treatment system |
| US10232328B2 (en) | 2012-01-25 | 2019-03-19 | General Electric Technology Gmbh | Gas mixing arrangement |
| CN109529622A (en) * | 2019-01-16 | 2019-03-29 | 北京工大环能科技有限公司 | One kind being used for more gas internal-combustion engine flue gas tail portion denitrating systems |
| CN114278417A (en) * | 2022-02-09 | 2022-04-05 | 无锡威孚力达催化净化器有限责任公司 | Exhaust aftertreatment urea mixing arrangement |
| CN115315572A (en) * | 2020-03-27 | 2022-11-08 | 五十铃自动车株式会社 | Mixing device |
Citations (5)
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| US3964875A (en) * | 1974-12-09 | 1976-06-22 | Corning Glass Works | Swirl exhaust gas flow distribution for catalytic conversion |
| DE3536315A1 (en) * | 1985-10-11 | 1987-04-16 | Sueddeutsche Kuehler Behr | Catalyst arrangement for the purification of exhaust gases, in particular of an internal combustion engine |
| JP2001179065A (en) * | 1999-12-28 | 2001-07-03 | Satsuki Kogyo:Kk | Mixer |
| US20030041896A1 (en) * | 2001-09-01 | 2003-03-06 | Olav Holm-Christensen | Method for distribution of gas, gas distributing device and silencer-catalyst system |
| CN101349182A (en) * | 2007-07-20 | 2009-01-21 | 三菱扶桑卡客车株式会社 | Exhaust purification device for engine |
-
2010
- 2010-07-06 CN CN 201010226366 patent/CN101900018A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3964875A (en) * | 1974-12-09 | 1976-06-22 | Corning Glass Works | Swirl exhaust gas flow distribution for catalytic conversion |
| DE3536315A1 (en) * | 1985-10-11 | 1987-04-16 | Sueddeutsche Kuehler Behr | Catalyst arrangement for the purification of exhaust gases, in particular of an internal combustion engine |
| JP2001179065A (en) * | 1999-12-28 | 2001-07-03 | Satsuki Kogyo:Kk | Mixer |
| US20030041896A1 (en) * | 2001-09-01 | 2003-03-06 | Olav Holm-Christensen | Method for distribution of gas, gas distributing device and silencer-catalyst system |
| CN101349182A (en) * | 2007-07-20 | 2009-01-21 | 三菱扶桑卡客车株式会社 | Exhaust purification device for engine |
Cited By (20)
| 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 |
| CN102022165B (en) * | 2010-12-15 | 2012-05-23 | 杭州银轮科技有限公司 | Hybrid unit of SCR (selective catalytic reduction) system for vehicle urea |
| 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 |
| CN102022165A (en) * | 2010-12-15 | 2011-04-20 | 杭州银轮科技有限公司 | Hybrid unit of SCR (selective catalytic reduction) system for vehicle urea |
| CN102337950A (en) * | 2011-09-26 | 2012-02-01 | 杭州银轮科技有限公司 | Vehicle urea SCR (Selective Catalyctic Reduction) system and static mixer thereof |
| 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 |
| US10232328B2 (en) | 2012-01-25 | 2019-03-19 | General Electric Technology Gmbh | Gas mixing arrangement |
| CN103883379A (en) * | 2014-04-08 | 2014-06-25 | 武汉理工大学 | SCR system of ship engine |
| CN103883379B (en) * | 2014-04-08 | 2016-08-17 | 武汉理工大学 | Ship machine SCR system |
| CN106855006A (en) * | 2015-12-08 | 2017-06-16 | 安徽艾可蓝节能环保科技有限公司 | One kind mixing disturbing flow device |
| CN105715341A (en) * | 2016-02-15 | 2016-06-29 | 东风朝阳朝柴动力环保科技有限公司 | Mixing flow spoiler for selective catalytic reduction system |
| CN107376645A (en) * | 2017-06-14 | 2017-11-24 | 北京福田戴姆勒汽车有限公司 | Exhaust treatment system |
| CN107376644A (en) * | 2017-06-14 | 2017-11-24 | 北京福田戴姆勒汽车有限公司 | The urea mixed-flow structure of exhaust treatment system |
| CN107376644B (en) * | 2017-06-14 | 2020-07-28 | 北京福田戴姆勒汽车有限公司 | Urea mixed flow structure of tail gas treatment system |
| CN109529622A (en) * | 2019-01-16 | 2019-03-29 | 北京工大环能科技有限公司 | One kind being used for more gas internal-combustion engine flue gas tail portion denitrating systems |
| CN109529622B (en) * | 2019-01-16 | 2023-11-14 | 北京工大环能科技有限公司 | Flue gas tail denitration system for multiple gas internal combustion engines |
| CN115315572A (en) * | 2020-03-27 | 2022-11-08 | 五十铃自动车株式会社 | Mixing device |
| CN115315572B (en) * | 2020-03-27 | 2024-04-02 | 五十铃自动车株式会社 | Mixer |
| CN114278417A (en) * | 2022-02-09 | 2022-04-05 | 无锡威孚力达催化净化器有限责任公司 | Exhaust aftertreatment urea mixing arrangement |
| CN114278417B (en) * | 2022-02-09 | 2023-03-14 | 无锡威孚力达催化净化器有限责任公司 | Exhaust aftertreatment urea mixing arrangement |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
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Application publication date: 20101201 |