CN103089383A - Guiding device and guiding method for diesel engine selective catalytic reduction (SCR) system for automobile - Google Patents
Guiding device and guiding method for diesel engine selective catalytic reduction (SCR) system for automobile Download PDFInfo
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- CN103089383A CN103089383A CN2013100414801A CN201310041480A CN103089383A CN 103089383 A CN103089383 A CN 103089383A CN 2013100414801 A CN2013100414801 A CN 2013100414801A CN 201310041480 A CN201310041480 A CN 201310041480A CN 103089383 A CN103089383 A CN 103089383A
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- diesel engine
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- scr system
- guide device
- guide plate
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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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- 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
Abstract
The invention relates to a guiding device and a guiding method for a diesel engine selective catalytic reduction (SCR) system for an automobile. The guiding device comprises an expansion pipe and at least two guiding plates arranged in a mutually embedding mode. The end where gas flows to the expansion pipe is a gas inlet end and the end where the gas flows out of the expansion pipe is a gas output end. The guiding plates at fixedly arranged on the gas inlet end of the expansion pipe and each guiding plate is in a trumpet shape without a front end face and a rear end face. A fluid channel is formed among the guiding plates. The guiding device is simple in structure, low in manufacturing cost and easy to install. According to the guiding device and the guiding method, due to backflow generated in the portion of an elbow pipe, exhaust of the automobile and urea sprayed from a nozzle can mix well so that generation of crystal on a wall is reduced. Due to the guiding device in the expansion pipe portion, mixed gas is converted from turbulent flow to laminar flow so that velocity distribution is even, radial pressure difference and temperature difference inside a catalytic agent are reduced, conversion efficiency of nitric oxides is improved, through capacity of a catalytic agent carrier is improved and service life of a catalyst is prolonged.
Description
Technical field
Patent of the present invention relates to diesel engine for automobile vent systems field, relates in particular a kind of flow guide device and method thereof for diesel engine for automobile SCR system.
Background technique
Diesel engine is with its fuel economy, power character, reliability and CO
2Discharging enjoys people's favor less, is exactly emission problem but there is a very large problem in diesel engine, and it brings a large amount of NOX and PM discharging to cause serious environmental pollution.Along with the increasingly stringent of Abgasgesetz, the emission control problem of diesel engine is still one of key challenge of diesel applications.
There are two different routes in the exhaust gas aftertreatment techniques that satisfies state's four emission regulation demands that China be about to implement for diesel engine: one is the EGR+grain catcher route take the U.S. as representative; Another is to take in Europe as the Optimizing Combustion of representative+SCR route.Studies show that in a large number the SCR technology has advantage at aspects such as reliability, stability, fuel consumption, anti-sulphur, drain period, heat radiation requirements than EGR technology, and be more suitable for the national conditions of China.
The SCR technology still will make purifying effect reach best just worldwide by promotion and application, also need overcome some deficiency: after air-flow enters expanding duct, produced flow separation along wall, formed larger stagnant area; Gas flow rate is uneven in catalyst converter, and air-flow mainly concentrates on the carrier center zone, make the catalyzer high temperature ageing of center region, and fringe region is not fully utilized, and affects the working life of catalyst converter; The flow velocity inequality also can cause catalyst converter carrier radial temperature and pressure gradient excessive simultaneously, produces larger Under Thermal Fatigue Damage, affects power character and the Economy of diesel engine.
Summary of the invention
The defects that exists for the flow guide device of diesel engine for automobile SCR system in prior art in order to improve the purifying effect of SCR technology, makes that in catalyst converter, air-flow is evenly distributed, and reduces catalyzer inner radial pressure reduction and the temperature difference, improves NO
XTransformation efficiency and the passing capacity of catalyst carrier, extend working life of catalyst converter, improve the utilization ratio of catalyzer, the invention provides a kind of flow guide device and method of river diversion thereof for diesel engine for automobile SCR system.
Technological scheme of the present invention is:
A kind of flow guide device for diesel engine for automobile SCR system, comprise expanding duct, the end that gas enters expanding duct is inlet end, the end that gas flows out expanding duct is the outlet side, this flow guide device also comprises the guide plate of at least two mutually nested settings, described guide plate is fixedly installed on the front end of expanding duct, and it is shaped as horn-like without front/rear end, forms the fluid passage between guide plate.
As a further improvement on the present invention, the quantity of described guide plate is 2 to 4.
Be further improvement of the present invention, the length of described guide plate is 1/3 to 2/3 of expanding duct length.
Be further improvement of the present invention, the angle angle ecto-entad of the body central axis of described guide plate and expanding duct successively decreases, and each guide plate evenly arranges with equal intervals.
Be further improvement of the present invention, also comprise the floor that is comprised of two orthogonal arch bars, the front and rear end of guide plate connects by described floor, and the end of floor is fixedly connected on the expanding duct inwall.
Be further improvement of the present invention, the inlet end of described expanding duct is connected with bend pipe.
Be further improvement of the present invention, the inside of described bend pipe is provided with nozzle, and described nozzle is arranged at the bending place in bend pipe, and in the bend pipe 5 ° of lateral deviations.The backflow that utilizes pipe bent position to produce makes tail gas better mix with the urea of nozzle ejection, promotes evaporation and the pyrolysis of urea, reduces the generation of wall crystallization.
Be further improvement of the present invention, consider the corrosivity of aqueous solution of urea, easily corrode mild steel sections during high temperature, the material of described guide plate is 304 above stainless steel materials.
Be further improvement of the present invention, be connected removably between described flow guide device for diesel engine for automobile SCR system and its external means.
A kind of method of river diversion of the flow guide device for diesel engine for automobile SCR system specifically comprises the following steps:
(1) motor exhaust enters the SCR system through outlet pipe;
(2) tail gas stream is through bend pipe; Nozzle ejection urea, the backflow that the bending place of bend pipe produces make the urea of tail gas and nozzle ejection evenly be mixed into mixed gas;
(3) spacing of the inlet end of fluid passage is less than the spacing of correspondingly outlet side, makes the gas flow rate of outlet side of guide plate less than the flow velocity of inlet end, and turbulent flow becomes laminar flow, and guiding gas flows in along the fluid passage to expanding duct;
(4) mixed gas enters catalyst carrier through expanding duct, and the interior air-flow of catalyst carrier is evenly distributed.
The invention has the beneficial effects as follows:
Flow guide device is simple in structure, cheap and be easy to installation, and nozzle is arranged on pipe bent position, and the backflow that utilizes pipe bent position to produce makes tail gas better mix with the urea of nozzle ejection, promotes evaporation and the pyrolysis of urea, reduces the generation of wall crystallization.Flow guide device is arranged on catalyst converter expanding duct front end, mixed gas is shunted when entering expanding duct in advance, increase the gas flow of expanding duct outer peripheral areas, reduce the traffic sharing rate of center region, the flow separation that weakening forms because of air-flow inertia and adverse pressure gradient, reduce the eddy current that the expanding duct wall occurs, gas flow rate is distributed more even, improve NO
XTransformation efficiency; Simultaneously can avoid air-flow mainly to concentrate on the center region of catalyst carrier, make the catalyzer high temperature ageing of center region, and fringe region is not fully utilized, and extends thus the working life of catalyst converter, improves the passing capacity of carrier and the utilization ratio of catalyzer.
Description of drawings
Fig. 1 is the diesel engine urea-SCR system schematic diagram;
Fig. 2 is diesel exhaust gas pipeline system architecture schematic diagram;
Fig. 3 is the structural representation of a kind of flow guide device for diesel engine for automobile SCR system of the present invention;
Fig. 4 is the 3-D view of a kind of flow guide device for diesel engine for automobile SCR system of the present invention;
Fig. 5 is the sectional view of a kind of flow guide device for diesel engine for automobile SCR system of the present invention;
Fig. 6 is the left view of a kind of flow guide device for diesel engine for automobile SCR system of the present invention.
In figure: 1, adpting flange; 2, bend pipe; 3, nozzle; 4, inlet end; 5, guide plate; 6, expanding duct; 7, outlet side; 8, SCR catalyst converter; 9, catalyst carrier; 10, pipeline after catalyst converter; 11, floor; 12, fluid passage.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further elaborated.
Diesel engine urea-SCR system as depicted in figs. 1 and 2, a kind of flow guide device for diesel engine for automobile SCR system of the present invention is installed between SCR catalyst converter 8 and bend pipe 2, its concrete structure such as Fig. 3 are to shown in Figure 6.
A kind of flow guide device for diesel engine for automobile SCR system of the present invention, the guide plate 5 that comprises expanding duct 6 and at least two mutually nested settings, the end that gas enters expanding duct 6 is inlet end 4, the end that gas flows out expanding duct 6 is outlet side 7, the inlet end 4 of expanding duct 6 is connected with bend pipe 2, guide plate 5 is fixedly installed on the front end of expanding duct 6, and it is shaped as horn-like without front/rear end, forms fluid passage 12 between guide plate.The quantity of guide plate 5 is preferably 2 to 4, and the length of guide plate 5 is preferably 1/3 to 2/3 of expanding duct 6 length.
As preferred version of the present invention, guide plate 5 successively decreases with the angle angle ecto-entad of the body central axis of expanding duct 6, and each guide plate 5 evenly arranges with equal intervals.Also comprise the floor 11 that is comprised of two orthogonal arch bars, the front and rear end of guide plate 5 connects by described floor 11, and the end of floor 11 is fixedly connected on expanding duct 6 inwalls.
As preferred version of the present invention, the inside of bend pipe 2 is provided with nozzle 3, and this nozzle 3 is arranged at the bending place in bend pipe 2, and is preferably to 5 ° of the interior lateral deviations of bend pipe 2.
As preferred version of the present invention, can be connected removably between described flow guide device for diesel engine for automobile SCR system and its external means.For example: bend pipe 2, flow guide device, SCR catalyst converter 8 are connected with catalyst converter rear end pipeline and are connected by adpting flange 1 successively.
The method of river diversion of a kind of flow guide device for diesel engine for automobile SCR system of the present invention, motor exhaust enters the SCR system through outlet pipe, at first through one section bend pipe 2, nozzle 3 is installed at 2 places at bend pipe, and to the interior lateral deviation of bend pipe 2, utilize the backflow of bend pipe 2 places generation that tail gas is better mixed with the urea of nozzle 3 ejections, promote evaporation and the pyrolysis of urea, reduce the generation of wall crystallization.The flow guide device that forms without the horn-like guide plate 5 of front/rear end by two groups is installed at expanding duct 6 places, steering flow flows in along fluid passage 12 to expanding duct, effect is that mixed gas is shunted when entering expanding duct 6 in advance, increase the gas flow of expanding duct 6 outer peripheral areas, reduce the traffic sharing rate of center region, weaken the flow separation that forms because of air-flow inertia and adverse pressure gradient, reduce the eddy current that the expanding duct wall occurs, gas flow rate is distributed more even, improve NO
XTransformation efficiency; Can avoid simultaneously air-flow mainly to concentrate on the center region of catalyst carrier 9, make the catalyzer high temperature ageing of center region, and fringe region be not fully utilized, and extends thus the working life of SCR catalyst converter 8, improves the utilization ratio of catalyzer.
With reference to Fig. 2-6, nozzle 3 is arranged on the bend pipe central axis, and flow guide device is arranged on catalyst converter expanding duct 6 front ends, is comprised of two groups of horn-like guide plates 5 without front/rear end, form fluid passage 12 between guide plate 5, guiding gas flows in along fluid passage 12 to expanding duct.Guide plate length is the 1/3-2/3 of expanding duct length, and guide plate 5 is that ecto-entad successively decreases with the angle of body central axis, and a plurality of guide plates 5 are evenly arranged with equal intervals.Described bend pipe 2, flow guide device, SCR catalyst converter 8 are connected pipeline 10 successively by adpting flange 1 connection with catalyst converter.The two ends of flow guide device are connect and be welded on body by floor 11.
Consider the corrosivity of aqueous solution of urea, easily corrode mild steel sections during high temperature, a kind of above stainless steels making of flow guide device employing 304 for diesel engine for automobile SCR system of the present invention.
Below by reference to the accompanying drawings the present invention has been carried out exemplary description, but specific implementation of the present invention is not subject to the restrictions described above.Adopt technological scheme of the present invention, not only can so that the urea of nozzle ejection and tail gas are fully mixed, improve NO
XTransformation efficiency, reduce simultaneously the generation of wall crystallization, can also make that mixed gas becomes laminar flow by turbulent flow in catalyst converter, velocity flow profile is more even, extends the working life of catalyst converter, improves the utilization ratio of catalyzer.
Claims (10)
1. flow guide device that is used for diesel engine for automobile SCR system, comprise expanding duct (6), the end that gas enters expanding duct (6) is inlet end (4), the end that gas flows out expanding duct (6) is outlet side (7), it is characterized in that: the guide plate (5) that also comprises at least two mutually nested settings, described guide plate (5) is fixedly installed on the front end of expanding duct (6), and it is shaped as horn-like without front/rear end, forms fluid passage (12) between guide plate.
2. a kind of flow guide device for diesel engine for automobile SCR system according to claim 1, it is characterized in that: the quantity of described guide plate (5) is 2 to 4.
3. a kind of flow guide device for diesel engine for automobile SCR system according to claim 1, it is characterized in that: the length of described guide plate (5) is 1/3 to 2/3 of expanding duct (6) length.
4. a kind of flow guide device for diesel engine for automobile SCR system according to claim 1, it is characterized in that: described guide plate (5) successively decreases with the angle angle ecto-entad of the body central axis of expanding duct (6), and each guide plate (5) evenly arranges with equal intervals.
5. a kind of flow guide device for diesel engine for automobile SCR system described according to claim 1 to 4, it is characterized in that: also comprise the floor (11) that is formed by two orthogonal arch bars, the front and rear end of guide plate (5) connects by described floor (11), and the end of floor (11) is fixedly connected on expanding duct (6) inwall.
6. the described a kind of flow guide device for diesel engine for automobile SCR system of any one according to claim 1 to 4, it is characterized in that: the inlet end (4) of described expanding duct (6) is connected with bend pipe (2).
7. a kind of flow guide device for diesel engine for automobile SCR system according to claim 6, it is characterized in that: the inside of described bend pipe (2) is provided with nozzle (3), described nozzle (3) is arranged at the bending place in bend pipe (2), and to 5 ° of the interior lateral deviations of bend pipe (2).
8. the described a kind of flow guide device for diesel engine for automobile SCR system of any one according to claim 1 to 4, it is characterized in that: the material of described guide plate (5) is 304 above stainless steel materials.
9. the described a kind of flow guide device for diesel engine for automobile SCR system of any one according to claim 1 to 4 is characterized in that: be connected removably between described flow guide device for diesel engine for automobile SCR system and its external means.
10. the method for river diversion of the described a kind of flow guide device for diesel engine for automobile SCR system of any one in a claim 1 to 9 specifically comprises the following steps:
(a) motor exhaust enters the SCR system through outlet pipe;
(b) the motor exhaust bend pipe (2) of flowing through; Nozzle (3) ejection urea, the backflow that the bending place of bend pipe (2) produces make the urea of tail gas and nozzle ejection evenly be mixed into mixed gas;
(c) spacing of the inlet end (4) of fluid passage (12) is less than the spacing of correspondingly outlet side (7), make the gas flow rate of outlet side (7) of guide plate (5) less than the flow velocity of inlet end (4), turbulent flow becomes laminar flow, and guiding gas along the fluid passage (12) flow in expanding duct (6);
(d) mixed gas enters carrier through expanding duct (6), and the interior air-flow of carrier is evenly distributed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310041480.1A CN103089383B (en) | 2013-02-04 | 2013-02-04 | Guiding device and guiding method for diesel engine selective catalytic reduction (SCR) system for automobile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310041480.1A CN103089383B (en) | 2013-02-04 | 2013-02-04 | Guiding device and guiding method for diesel engine selective catalytic reduction (SCR) system for automobile |
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| CN103089383A true CN103089383A (en) | 2013-05-08 |
| CN103089383B CN103089383B (en) | 2015-07-08 |
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| CN201310041480.1A Expired - Fee Related CN103089383B (en) | 2013-02-04 | 2013-02-04 | Guiding device and guiding method for diesel engine selective catalytic reduction (SCR) system for automobile |
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Cited By (5)
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| CN106368773A (en) * | 2016-08-30 | 2017-02-01 | 潍柴动力股份有限公司 | Engine and double-whirl mixing device thereof |
| CN109723522A (en) * | 2017-10-31 | 2019-05-07 | 现代自动车株式会社 | The level gauging connecting tube that can prevent splash for container |
| CN110055728A (en) * | 2019-04-26 | 2019-07-26 | 安徽干霸电器股份有限公司 | A kind of low-power warm air clothes dryer |
| CN111465160A (en) * | 2020-05-14 | 2020-07-28 | 国网重庆市电力公司电力科学研究院 | Plasma jet generating device and system |
| CN111677581A (en) * | 2020-06-23 | 2020-09-18 | 南通大学 | Airflow guiding device for SCR |
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| CN103089383B (en) | 2015-07-08 |
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