CN102042063A - Atomizing jet-spray device for reducing agent for purifying exhaust nitric oxide of diesel engine - Google Patents
Atomizing jet-spray device for reducing agent for purifying exhaust nitric oxide of diesel engine Download PDFInfo
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- CN102042063A CN102042063A CN 201010553787 CN201010553787A CN102042063A CN 102042063 A CN102042063 A CN 102042063A CN 201010553787 CN201010553787 CN 201010553787 CN 201010553787 A CN201010553787 A CN 201010553787A CN 102042063 A CN102042063 A CN 102042063A
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Abstract
The invention discloses a simply structured and efficient atomizing jet-spray device for a reducing agent for purifying exhaust nitric oxide of a diesel engine, which is implemented through the following technical scheme: a medium inlet pipe is communicated with a medium dispersion chamber, a medium strengthening preheating chamber is fixed under the medium dispersion chamber, the medium dispersion chamber is communicated with the medium strengthening preheating chamber through a tangential inlet, the bottom of the medium strengthening preheating chamber is communicated with a medium outlet pipe, four radial atomizing spraying holes are uniformly distributed on a peripheral surface at a tail end of the medium outlet pipe, a hemisphere having a flute is embedded in each spraying hole, and the spaying holes are communicated with the flute. The atomizing jet-spray device is simple in structure form, rational in design of the spaying holes and good in atomizing effect. The device has no influence on pressure drop of the whole exhaust line according to variation of work conditions of the engine, so that the device has no influence on power performance of the engine.
Description
Technical field
The invention belongs to diesel motor exhaust discharged nitrous oxides pollution control technology field, further relate to a kind of atomization jetting device that is used for diesel engine vent gas purification of nitrogen oxides reducing agent.
Background technique
Diesel engine has obtained using widely in all trades and professions with its higher thermal efficiency and lower toxic emission, but its higher discharged nitrous oxides is a problem that perplexs people for a long time.Selecting catalytic reduction technology (Urea-SCR) is the effective ways of control diesel engine nitrogen oxide, the nitrogen oxide that the ammonia that this technology uses certain density urea liquid (automobile-used urea liquid) to generate after pervaporation, pyrolysis and hydrolysis usually selects the catalytic reduction diesel emission to come out.And the good and bad transformation efficiency of the SCR catalyst converter in downstream to nitrogen oxide that directly influence of automobile-used aqueous solution of urea atomizing effect.
Motor exhaust purification of nitrogen oxides reducing agent atomizing effect (liquid-drop diameter) has direct relation with pressure medium, atomised form, nozzle arrangements, spray orifice, the aqueous solution of urea that is the influence atomizing can evenly mix with tail gas fully, especially strengthen the reducing agent hot area, shorten the principal element of reducing agent evaporation, pyrolysis and hydrolysis time.Generally speaking, motor exhaust purification of nitrogen oxides reducing agent adopts the nozzle of air-assisted atomization, and its atomised form has two kinds of solid-cone and hollow cones, and the atomizing cone angle is about 20 degree, and the covering space cross section is quite limited.Though adopt the porous atomizer to strengthen effective atomization space cross section, but still can't reach the most of cross section that covers outlet pipe.In addition, the aperture of atomizer nozzle is also usually at 0.5-1mm, the liquid-drop diameter of atomizing is generally more than 50 μ m, had a strong impact on the utilization efficiency of Urea-SCR system urea liquid supply precision and SCR catalyst converter, very easily form overspray, participate in catalytic reduction reaction and just enter in the ambient air, finally cause ammonia to leak, and make reducing agent after the atomizing fail in time to generate ammonia the new pollutant of environment generation along with motor exhaust.
Also have, when the motor exhaust air communication is crossed the aqueous solution of urea zone of atomizing, because wearing of atomizer nozzle penetrate distance, the bigger drop of diameter can corrode the assembling set of outlet pipe and atomizer nozzle for a long time so usually very easily attached to forming the urea crystals body on the outlet pipe inwall.
Therefore, be the supply precision of raising Urea-SCR system and purification efficiency and the leakage of minimizing (or avoiding) reducing agent and the urea crystals on the outlet pipe inwall of SCR catalyst converter, need take a kind of measure that diesel engine vent gas purification of nitrogen oxides reducing agent air-assisted atomization sprays that is used for.
Summary of the invention
The object of the present invention is to provide the atomization jetting device that is used for diesel engine vent gas purification of nitrogen oxides reducing agent that a kind of structural type is simple, atomizing effect is good.
The present invention is used for the atomization jetting device of diesel engine vent gas purification of nitrogen oxides reducing agent, be achieved by the following technical programs, the medium inlet pipeline communicates with medium disperse chamber, mounting medium strengthening preheating chamber, below, medium disperse chamber, communicate by tangential inlet between medium disperse chamber and the medium strengthening preheating chamber, bottom, medium strengthening preheating chamber communicates with the media outlet pipeline, media outlet pipeline tail end side face evenly is provided with four spray orifices that radially atomize, each spray orifice is inlayed the hemisphere of a band groove, and spray orifice communicates with groove.
The taper of medium strengthening preheating of the present invention chamber for standing upside down.
The present invention adopts stainless steel material to make, and is installed on the outlet pipe of SCR catalyst converter upstream.
The present invention has following advantage with respect to prior art:
(1) atomizing media broad covered area in outlet pipe, no dead angle can make motor exhaust fully mix with the aqueous solution of urea of atomizing, thus the excess coefficient and the ammonia that reduce diesel SCR supply system reducing agent leak.
(2) the atomized drop diameter is little, can accelerate evaporation, hydrolysis and the pyrolysis rate of medium, improves the efficient of SCR catalyst converter, the urea crystals on minimizing outlet pipe inwall and the urea atomizer nozzle link and the supply precision of medium.
(3) this contrive equipment structural type is simple, designs of nozzles is reasonable, atomizing effect good.Therefore this device can not impact engine power performance with the not influence of pressure drop to whole gas exhaust piping of the difference of engine operating condition.
(4) material of the present invention is a stainless steel, is convenient to produce, and is easy for installation, reliable, with low cost.
Description of drawings
Fig. 1 is the layout plan of the present invention on exhaust after treatment system;
Fig. 2 is a perspective view of the present invention;
Fig. 3 is a structure principle chart of the present invention.
Embodiment
The present invention will be further described below in conjunction with accompanying drawing.
The present invention as shown in Figures 2 and 3, medium inlet pipeline 11 communicates with medium disperse chamber 13, mounting medium strengthening preheating chamber, below, medium disperse chamber 15, communicate by tangential inlet 14 between medium disperse chamber and the medium strengthening preheating chamber, bottom, medium strengthening preheating chamber communicates with the media outlet pipeline, media outlet pipeline 12 tail end side faces evenly are provided with four spray orifices that radially atomize, and each spray orifice is inlayed the hemisphere of a band groove, and spray orifice communicates with groove.
The present invention adopts stainless steel material to make, and is installed on the outlet pipe of SCR catalyst converter upstream.The principle of the invention is as follows:
(1) heating process of the present invention (as Fig. 1): this device 2 is installed in the exhaust duct 4, between cyclone separator 1 and SCR catalyst converter 3, be installed in the outlet pipe the medium atomization device through with the heat transfer effect of motor exhaust, temperature rises to 300～500 ℃ of (relevant with engine operating condition), especially medium strengthening preheating chambers rapidly;
(2) medium strengthening preheating and atomization process (as Fig. 3):
After medium passes through medium inlet pipeline 11, enter disperse chamber 13 and be full of whole chamber;
Medium in the disperse chamber 13 enters the strengthening preheating chamber 15 from tangential inlet 14 respectively.Because preheating chamber 15 is tapers (convergent from top to bottom) of a handstand, innerly form the rotational shear turbulent motion, thereby medium obtains bigger centrifugal force and moves along inwall, and and the abundant heat exchange of inwall of preheating chamber 15; Meanwhile, behind the urea liquid strengthening preheating in the medium, the multiple product after evaporation, hydrolysis and the pyrolysis makes whole preheating chamber form concentration gradient up and down, produces convection heat exchange.Thereby make medium obtain maximum preheating;
In the outlet 12 of medium atomization device, 4 spray orifices that radially atomize are arranged, all there is the hemisphere of a band groove each spray orifice top, and spray orifice communicates with groove.So, the medium after the preheating forms 4 fan-shaped atomizing zones by these 4 atomizing spray orifices on the cross section of outlet pipe, be close to 360 ° full coverage; And the about 200 μ m in aperture of atomizing spray orifice, outlet pressure generally is no more than 5 barometric pressure, and its atomized drop diameter (SMD) is less than 20 μ m, thereby can make medium and motor exhaust obtain full and uniform mixing, and the chemical reaction velocity of quickening medium.
The general stainless steel material of selecting, ambient temperature is the aqueous solution of urea of high temperature diesel engine vent gas and alkalescence at 200～500 ℃ with working medium, this device mounting point is generally in SCR catalyst converter upstream.
Claims (3)
1. atomization jetting device that is used for diesel engine vent gas purification of nitrogen oxides reducing agent, it is characterized in that, the medium inlet pipeline communicates with medium disperse chamber, mounting medium strengthening preheating chamber, below, medium disperse chamber, communicate by tangential inlet between medium disperse chamber and the medium strengthening preheating chamber, bottom, medium strengthening preheating chamber communicates with the media outlet pipeline, and media outlet pipeline tail end side face evenly is provided with four spray orifices that radially atomize, each spray orifice is inlayed the hemisphere of a band groove, and spray orifice communicates with groove.
2. the atomization jetting device that is used for diesel engine vent gas purification of nitrogen oxides reducing agent according to claim 1 is characterized in that, the taper of described medium strengthening preheating chamber for standing upside down.
3. the atomization jetting device that is used for diesel engine vent gas purification of nitrogen oxides reducing agent according to claim 1 is characterized in that, described device adopts stainless steel material to make, and is installed on the outlet pipe of SCR catalyst converter upstream.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010553787 CN102042063A (en) | 2010-09-30 | 2010-09-30 | Atomizing jet-spray device for reducing agent for purifying exhaust nitric oxide of diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010553787 CN102042063A (en) | 2010-09-30 | 2010-09-30 | Atomizing jet-spray device for reducing agent for purifying exhaust nitric oxide of diesel engine |
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| CN102042063A true CN102042063A (en) | 2011-05-04 |
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| CN 201010553787 Pending CN102042063A (en) | 2010-09-30 | 2010-09-30 | Atomizing jet-spray device for reducing agent for purifying exhaust nitric oxide of diesel engine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104053878A (en) * | 2012-01-14 | 2014-09-17 | 戴姆勒股份公司 | Exhaust Gas System Of An Internal Combustion Engine, And Method For Preparing A Reducing Agent Which Is Introduced Into The Internal Combustion Engine Exhaust Gas |
| CN108301902A (en) * | 2018-02-26 | 2018-07-20 | 华南理工大学 | A kind of centrifugal diesel engine exhaust gas purification device and its purification method |
| CN115163255A (en) * | 2021-04-07 | 2022-10-11 | 洛阳信德科技有限公司 | Application method of high-pressure spray head device for purifying smoke dust in engine tail gas |
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| CN1651728A (en) * | 2004-02-05 | 2005-08-10 | 赫多特普索化工设备公司 | Injection nozzle for purification |
| EP1669566A1 (en) * | 2003-09-19 | 2006-06-14 | Nissan Diesel Motor Co., Ltd. | Exhaust gas purification device of engine |
| CN101378838A (en) * | 2006-02-08 | 2009-03-04 | Stt伊姆特克公司 | Injection device |
| JP2010065588A (en) * | 2008-09-10 | 2010-03-25 | Denso Corp | Urea water injection system |
| CN101696648A (en) * | 2009-09-27 | 2010-04-21 | 无锡市凯龙汽车设备制造有限公司 | Nozzle for selective catalytic conversion system of diesel engine |
| CN201843667U (en) * | 2010-09-30 | 2011-05-25 | 中国人民解放军军事交通学院 | Atomization injection device for nitric oxide purification reducing agent for tail gas of diesel engine |
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2010
- 2010-09-30 CN CN 201010553787 patent/CN102042063A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1669566A1 (en) * | 2003-09-19 | 2006-06-14 | Nissan Diesel Motor Co., Ltd. | Exhaust gas purification device of engine |
| CN1651728A (en) * | 2004-02-05 | 2005-08-10 | 赫多特普索化工设备公司 | Injection nozzle for purification |
| CN101378838A (en) * | 2006-02-08 | 2009-03-04 | Stt伊姆特克公司 | Injection device |
| JP2010065588A (en) * | 2008-09-10 | 2010-03-25 | Denso Corp | Urea water injection system |
| CN101696648A (en) * | 2009-09-27 | 2010-04-21 | 无锡市凯龙汽车设备制造有限公司 | Nozzle for selective catalytic conversion system of diesel engine |
| CN201843667U (en) * | 2010-09-30 | 2011-05-25 | 中国人民解放军军事交通学院 | Atomization injection device for nitric oxide purification reducing agent for tail gas of diesel engine |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104053878A (en) * | 2012-01-14 | 2014-09-17 | 戴姆勒股份公司 | Exhaust Gas System Of An Internal Combustion Engine, And Method For Preparing A Reducing Agent Which Is Introduced Into The Internal Combustion Engine Exhaust Gas |
| CN108301902A (en) * | 2018-02-26 | 2018-07-20 | 华南理工大学 | A kind of centrifugal diesel engine exhaust gas purification device and its purification method |
| CN108301902B (en) * | 2018-02-26 | 2023-09-26 | 华南理工大学 | Centrifugal diesel engine tail gas purifying device and purifying method thereof |
| CN115163255A (en) * | 2021-04-07 | 2022-10-11 | 洛阳信德科技有限公司 | Application method of high-pressure spray head device for purifying smoke dust in engine tail gas |
| CN115163255B (en) * | 2021-04-07 | 2023-07-21 | 洛阳信德科技有限公司 | Application method of high-pressure spray nozzle device for purifying tail gas and smoke dust of engine |
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Application publication date: 20110504 |