CN101245726B - SCR reprocessing piping device of large-duty engine - Google Patents
SCR reprocessing piping device of large-duty engine Download PDFInfo
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- CN101245726B CN101245726B CN2007100135583A CN200710013558A CN101245726B CN 101245726 B CN101245726 B CN 101245726B CN 2007100135583 A CN2007100135583 A CN 2007100135583A CN 200710013558 A CN200710013558 A CN 200710013558A CN 101245726 B CN101245726 B CN 101245726B
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- bend pipe
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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
- 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
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Abstract
The invention discloses an SCR post treatment pipeline device for a large displacement engine, which includes an ejection pipeline. The ejection pipeline is provided with at least one nozzle that can spray carbamide liquor in the ejection pipeline. The nozzle is mounted on the ejection pipeline in a mode that the spraying direction is along the flow direction of the smoke body in the ejection pipeline and the spraying axis of the nozzle forms an included angle together with the axis of the ejection pipeline positioned along the spraying direction of the nozzle. Mixers are respectively arranged along the spraying direction of the nozzle in the ejection pipeline. The device can lead the carbamide liquor to be fast hydrolyzed to release ammonia and uniformly mixed with waste gas. The hydrolyzing rate of the carbamide is higher, thus leading an NOx compound to have longer reaction time and to be fully reacted and leading the SCR system to have higher waste gas conversion rate.
Description
Technical field
The present invention relates to a kind of after-treatment device of engine emission, especially relate to a kind of SCR reprocessing piping device of large-duty engine that is used to adopt SCR technical finesse emissions from engines.
Background technique
Along with the development of society and the concern of environmental pollution problem; people have strengthened the dynamics to environmental protection; and the effulent of Motor Vehicle is the major pollutants in the atmosphere; therefore at the effulent of Motor Vehicle; people adopt various method means to eliminate the harmful matter that it contains, and the main motor post-processing technology means of people's employing at present comprise cooling EGR (exhaust gas recirculation), NOx adsorber, SCR (selective catalytic reduction) and DPF post-processing technologies such as (exhaust gas recirculation add particle trapper).The harmful matter, especially the NOx compound that wherein adopt the SCR technology to handle in the engine emission are a kind of very effective methods.Motor SCR post-processing technology is that the reducing agent urea liquid is sprayed in the engine emission waste gas, under exhaust gas temperature and air-flow effect, urea can decompose fast, discharge ammonia, the NOx effect higher with content, reach the purpose that reduces the NOx discharging, because the reducing agent of SCR system is a urea, its stable performance under user mode not, and it is simple to have a chemical reaction, advantages such as required reducing agent relative quantity is few obtain people's popularization and use, wherein, key is that urea can decompose fast in the short time and discharges ammonia and evenly mix with waste gas in the SCR post-processing technology, under the effect of catalyzer, fully react to reduce the NOx compound in the combustion gas with NOx in the discharging waste gas, and in the motor SCR after-treatment system that current people use, after urea liquid sprays in the waste gas of engine emission, can not decompose fully at short notice and discharge ammonia, the hydrolysis of urea rate is low, and it is also lower with the mixed uniformity of combustion gas, this makes that the ammonia and the NOx compound reaction time that discharge are short, reaction not exclusively, reduced the waste gas conversion ratio, especially fast for flow velocity, thereby the big big large-duty engine of waste gas treatment amount of flow, this phenomenon is more obvious.This has influenced the effect of SCR system to the engine emission reprocessing greatly, has influenced the processing of people to emissions from engines.
Summary of the invention
Technical problem to be solved by this invention has provided a kind of SCR reprocessing piping device of large-duty engine, it can make the quick hydrolysis of urea liquid discharge ammonia and evenly mix with waste gas, and the hydrolysis of urea rate is higher, make the NOx compound have long reaction time and sufficient reacting, therefore make the SCR system have higher waste gas conversion ratio.
For solving the problems of the technologies described above, technological scheme of the present invention is: SCR reprocessing piping device of large-duty engine, comprise the injection line that is arranged between motor and the SCR after-treatment device, at least one can spray urea liquid in injection line nozzle is installed on the injection line, described nozzle is installed on the injection line in the mode of injection direction along smoke flow direction in the injection line, and the nozzle ejection axis has angle with the axis that is positioned at the injection line on its injection direction; Be positioned in the described injection line and be respectively equipped with mixer on the nozzle spray direction.
As a kind of improvement, described nozzle is two, and described injection line comprises bellows, first bend pipe, straight tube, second bend pipe and the connecting tube that connects successively, and connecting tube has a straight tube end that is connected with second bend pipe; Described nozzle is installed in the outer arc side of described first bend pipe and second bend pipe respectively.
As further improvement, be respectively equipped with mixer between described first bend pipe and straight tube and second bend pipe and the connecting tube.
As further improvement, be provided with oxidation catalyzer between the described bellows and first bend pipe.
As further improvement, described first bend pipe is the bend pipe of 90 ℃ of bend angle, and described second bend pipe is the bend pipe of 120 ℃ of bend angle.
As further improvement, described mixer is to be arranged on the screen cloth that has sieve aperture in the injection line, on the screen cloth sieve aperture place be provided with the fluid by sieve aperture can be mixed scratch the stream catch.
As further improvement, it is 15 ℃ of angles that described nozzle ejection axis constitutes angle with the axis that is positioned at the injection line on its injection direction.
The SCR reprocessing piping device of large-duty engine of technique scheme, owing to be to adopt the injection line between motor and SCR after-treatment device that at least one can spray urea liquid in injection line nozzle is installed, nozzle is installed on the injection line in the mode of injection direction along smoke flow direction in the injection line, and the nozzle ejection axis has angle with the axis that is positioned at the injection line on its injection direction; Be respectively equipped with mixer on the nozzle spray direction and be positioned in the injection line, make urea liquid like this after spraying into injection line, hydrolysis discharges ammonia and mixes with engine emission waste gas rapidly under the effect of mixer, thereby making the NOx compound have the long time fully reacts, improved the SCR system to engine emission treatment of waste gas conversion ratio, and exhaust back pressure is also lower, and is lower to the running influence of motor.Injection line adopts bellows, first bend pipe, straight tube, second bend pipe and the connecting tube that connects successively, connecting tube has a straight tube end that is connected with second bend pipe, and nozzle is installed in the outer arc side of first bend pipe and second bend pipe respectively, simple in structure, easy for installation, and make nozzle and injection direction and straight tube have angle with rational, and improved waste gas mixture homogeneity in urea liquid and the injection line, help reaction with the NOx compound.Be respectively equipped with mixer between first bend pipe and straight tube and second bend pipe and the connecting tube and between the bellows and first bend pipe, be provided with oxidation catalyzer, can improve NO in the NOx compound greatly
2Content and urea liquid and waste gas mixture homogeneity.First bend pipe adopts the bend pipe of 90 ℃ of bend angle, second bend pipe adopts the bend pipe of 120 ℃ of bend angle, make things convenient for nozzle to install, mixer adopts and is arranged on the screen cloth that has sieve aperture in the injection line, and on screen cloth the sieve aperture place be provided with the fluid by sieve aperture can be mixed scratch the stream catch, it is more even that urea liquid is mixed with combustion gas.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is further described.
Fig. 1 is the structural representation of SCR reprocessing piping device of large-duty engine of the present invention;
Fig. 2 is a SCR reprocessing piping device of large-duty engine nozzle mounting structure schematic representation of the present invention.
Embodiment
As shown in Figure 1, SCR reprocessing piping device of large-duty engine, be arranged on NOx compound and other harmful matter of containing with effective removal combustion gas on the engine exhaust emission pipeline, it comprises the injection line that is arranged between motor and the SCR after-treatment device, at least one can spray urea liquid in injection line nozzle 3 is being installed on the injection line, nozzle 3 is installed on the injection line in the mode of injection direction along smoke flow direction in the injection line, and nozzle 3 jet axis have angle with the axis that is positioned at the injection line on its injection direction, in injection line, be positioned on nozzle 3 injection directions and be respectively equipped with mixer 2, mixer 2 can adopt the form that is arranged on the screen cloth that has sieve aperture in the injection line, and on the screen cloth sieve aperture place be provided with the fluid by sieve aperture can be mixed scratch the stream catch.Like this nozzle 3 just along with injection line in the discharging waste gas direction that flows spraying urea liquid is injected in the injection line mix at angle with combustion gas, both mix after through mixer 2, simultaneously, because the temperature of combustion gas is higher, urea is that hydrolyzable discharges ammonia in the short period of time, and percent hydrolysis is also higher, itself and NOx compound sufficient reacting under the effect of catalyzer, thus make the SCR system have higher waste gas conversion ratio.
As shown in Figure 1, this SCR reprocessing piping device of large-duty engine can adopt two nozzles 3, injection line comprises bellows 1, first bend pipe 4, straight tube 6, second bend pipe 5 and connecting tube 7, bellows 1 is provided with the pipeline of spiral grooves for inwall, connecting tube 7 is provided with a straight tube end, bellows 1, first bend pipe 4, straight tube 6, second bend pipe 5 is connected successively with connecting tube 7, and connecting tube 7 straight tube ends are connected with second bend pipe 5, and two nozzles 3 are installed in the outer arc side of first bend pipe 4 and second bend pipe 5 respectively, and can be at first bend pipe 4 and straight tube 6, and second be respectively equipped with mixer 2 between bend pipe 5 and the connecting tube 7, such mode of structure, not only simple in structure, and it is easy for installation, the urea liquid hydrolysis rapidly that is sprayed into by nozzle 3 discharges ammonia and mixes with combustion gas, so that the NOx compound fully reacts in the waste gas.Has good mobility for making the waste gas in the whole injection line and spraying the urea liquid that advances again in the well-mixed while, do not influence the exhaust back pressure of motor again, it is 90 ℃ bend pipe that first bend pipe 4 can adopt bend angle, second bend pipe 5 then adopts the bend pipe of 120 ℃ of bend angle, and as shown in Figure 2, two nozzles 3 when mounted, the jet axis of nozzle 3 can constitute 15 ℃ of angles with the axis that injection line is positioned at straight tube 6 on nozzle 3 injection directions and connecting tube 7 straight tube ends, so that the spraying urea liquid bundle that nozzle 3 ejects is asymmetric, evenly mix with waste gas helping.In the process of practical application, according to circumstances the actual demand of difference and motor adopts a nozzle and a mixer.
Because urea has corrosivity, therefore can adopt stainless steel material from nozzle 3 each parts of back, and be connected to flange and be connected to the master, and tight seal, because the hydrolysis reaction and the SCR reduction reaction of urea all has requirement to temperature when the SCR system works, so this piping installation is unsuitable long, when car load is installed, size should change in allowed band, below 1800mm.
The SCR system is when handling emissions from engines, and the hydrolysis of urea process is
(NH
2)
2CO+H
2O→2NH
3+CO
2
It is more than 200 ℃ that reaction temperature requires;
The SCR reduction reaction:
4NH
3+4NO+O
2→4N
2+6H
2O
2NH
3+NO+NO
2→N
2+3H
2O
As seen the speed of SCR system works reduction reaction speed not only with hydrolysis after NH
3Concentration, the temperature of reaction is relevant, with NO
2Content also relevant, NO
2Content help the generation of reduction reaction more, therefore, can between the bellows 1 and first bend pipe 4, be provided with oxidation catalyzer, so that the NO oxidation in the waste gas generates NO
2, to help the work of SCR system.
This SCR reprocessing piping device of large-duty engine is when work, though the discharging of NOx compound is higher, but row's temperature of its big loading point is also higher, though therefore the extraction flow of large-duty engine is bigger, flow velocity is very fast, but its conversion ratio still can stably remain on more than 60% through this SCR reprocessing piping device.
Claims (7)
1. SCR reprocessing piping device of large-duty engine, comprise the injection line that is arranged between motor and the SCR after-treatment device, at least one can spray urea liquid in injection line nozzle (3) is installed on the injection line, it is characterized in that: described nozzle (3) is installed on the injection line in the mode of injection direction along smoke flow direction in the injection line, and nozzle (3) jet axis has angle with the axis that is positioned at the injection line on its injection direction; Be positioned in the described injection line on nozzle (3) injection direction and be respectively equipped with mixer (2).
2. SCR reprocessing piping device of large-duty engine as claimed in claim 1, it is characterized in that: described nozzle (3) is two, described injection line comprises bellows (1), first bend pipe (4), straight tube (6), second bend pipe (5) and the connecting tube (7) that connects successively, and connecting tube (7) has a straight tube end that is connected with second bend pipe (5); Described nozzle (3) is installed in the outer arc side of described first bend pipe (4) and second bend pipe (5) respectively.
3. SCR reprocessing piping device of large-duty engine as claimed in claim 2 is characterized in that: be respectively equipped with mixer (2) between described first bend pipe (4) and straight tube (6) and second bend pipe (5) and the connecting tube (7).
4. SCR reprocessing piping device of large-duty engine as claimed in claim 2 is characterized in that: be provided with oxidation catalyzer between described bellows (1) and first bend pipe (4).
5. SCR reprocessing piping device of large-duty engine as claimed in claim 2 is characterized in that: described first bend pipe (4) is a bend angle 90
Bend pipe, described second bend pipe (5) is a bend angle 120
Bend pipe.
6. SCR reprocessing piping device of large-duty engine as claimed in claim 1, it is characterized in that: described mixer (2) is for to be arranged on the screen cloth that has sieve aperture in the injection line, on the screen cloth sieve aperture place be provided with the fluid by sieve aperture can be mixed scratch the stream catch.
7. as each described SCR reprocessing piping device of large-duty engine in the claim 1 to 6, it is characterized in that: it is 15 that described nozzle (3) jet axis constitutes angle with the axis that is positioned at the injection line on its injection direction
Angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100135583A CN101245726B (en) | 2007-02-12 | 2007-02-12 | SCR reprocessing piping device of large-duty engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100135583A CN101245726B (en) | 2007-02-12 | 2007-02-12 | SCR reprocessing piping device of large-duty engine |
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| Publication Number | Publication Date |
|---|---|
| CN101245726A CN101245726A (en) | 2008-08-20 |
| CN101245726B true CN101245726B (en) | 2011-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007100135583A Active CN101245726B (en) | 2007-02-12 | 2007-02-12 | SCR reprocessing piping device of large-duty engine |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5349576B2 (en) * | 2011-12-27 | 2013-11-20 | 株式会社小松製作所 | Reducing agent aqueous solution mixing device and exhaust gas aftertreatment device |
| CN102852604A (en) * | 2012-09-29 | 2013-01-02 | 江苏绿源环保科技有限公司 | Urea injection device for tail gas denitration selective catalytic reduction (SCR) system of marine high-power diesel engine |
| SE539834C2 (en) * | 2016-04-11 | 2017-12-12 | Scania Cv Ab | An injection arrangement for injection of a urea solution into an exhaust gas passage |
| CN107376645A (en) * | 2017-06-14 | 2017-11-24 | 北京福田戴姆勒汽车有限公司 | Exhaust treatment system |
| CN109488490B (en) * | 2018-10-29 | 2020-10-09 | 安徽江淮汽车集团股份有限公司 | Mixing structure of engine exhaust gas recirculation system |
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1198960A (en) * | 1997-03-13 | 1998-11-18 | 赫多特普索化工设备公司 | Process for selective reduction of NOx in exhaust gases |
| CN1597100A (en) * | 2003-05-07 | 2005-03-23 | 韩国高化环保技术有限公司 | Catalytic process for nitrogen oxides reduction by multi-injection and use thereof |
| CN1788830A (en) * | 2004-11-29 | 2006-06-21 | 丰田自动车株式会社 | Exhaust gas purifying apparatus and method for controlling it |
| CN201013423Y (en) * | 2007-02-12 | 2008-01-30 | 潍柴动力股份有限公司 | SCR post-treating pipe apparatus for high fluid rate engine |
-
2007
- 2007-02-12 CN CN2007100135583A patent/CN101245726B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1198960A (en) * | 1997-03-13 | 1998-11-18 | 赫多特普索化工设备公司 | Process for selective reduction of NOx in exhaust gases |
| CN1597100A (en) * | 2003-05-07 | 2005-03-23 | 韩国高化环保技术有限公司 | Catalytic process for nitrogen oxides reduction by multi-injection and use thereof |
| CN1788830A (en) * | 2004-11-29 | 2006-06-21 | 丰田自动车株式会社 | Exhaust gas purifying apparatus and method for controlling it |
| CN201013423Y (en) * | 2007-02-12 | 2008-01-30 | 潍柴动力股份有限公司 | SCR post-treating pipe apparatus for high fluid rate engine |
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| CN101245726A (en) | 2008-08-20 |
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Inventor after: Tan Xuguang Inventor after: Tong Dehui Inventor after: Sun Shaojun Inventor after: Wang Jun Inventor after: Deng Yulong Inventor after: Ma Yan Inventor before: Wang Jun Inventor before: Deng Yulong Inventor before: Ma Yan |
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