CN201843667U - Atomization injection device for nitric oxide purification reducing agent for tail gas of diesel engine - Google Patents
Atomization injection device for nitric oxide purification reducing agent for tail gas of diesel engine Download PDFInfo
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- CN201843667U CN201843667U CN2010205507113U CN201020550711U CN201843667U CN 201843667 U CN201843667 U CN 201843667U CN 2010205507113 U CN2010205507113 U CN 2010205507113U CN 201020550711 U CN201020550711 U CN 201020550711U CN 201843667 U CN201843667 U CN 201843667U
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- reducing agent
- diesel engine
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Abstract
The utility model discloses an atomization injection device for a nitric oxide purification reducing agent for tail gas of a diesel engine, which has a simple structure form and a good atomization effect. The atomization injection device is implemented by the following technical scheme that: a medium inlet pipeline is communicated with a medium dispersion chamber; a medium reinforcing preheating chamber is fixed on the lower part of the medium dispersion chamber; the medium dispersion chamber is communicated with the medium reinforcing preheating chamber by a tangential inlet; the bottom of the medium reinforcing preheating chamber is communicated with a medium outlet pipeline; the peripheral surface of the tail end of the medium outlet pipeline is uniformly provided with four radial atomization spray orifices; a hemisphere with a groove is respectively embedded in each spray orifice; and the spray orifices are communicated with the grooves. The device has the simple structure form, a reasonable design of the spray orifices and the good atomization effect. The device has no influence on the pressure drop of the whole exhaust pipeline with difference of the working condition of an engine so as not to cause influence on the power performance of the engine.
Description
Technical field
The utility model belongs to diesel motor exhaust discharged nitrous oxides pollution control technology field, further relates 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.
The model utility content
The purpose of this utility model 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 utility model 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 described in the utility model chamber for standing upside down.
The utility model adopts stainless steel material to make, and is installed on the outlet pipe of SCR catalyst converter upstream.
The utility model 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 model utility apparatus structure form 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 that the utility model adopted 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 utility model on exhaust after treatment system;
Fig. 2 is the utility model perspective view;
Fig. 3 is the utility model structure principle chart.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further.
The utility model 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 utility model adopts stainless steel material to make, and is installed on the outlet pipe of SCR catalyst converter upstream.The utility model principle is as follows:
(1) the utility model heating process (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 |
|---|---|---|---|
| CN2010205507113U CN201843667U (en) | 2010-09-30 | 2010-09-30 | Atomization injection device for nitric oxide purification reducing agent for tail gas of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205507113U CN201843667U (en) | 2010-09-30 | 2010-09-30 | Atomization injection device for nitric oxide purification reducing agent for tail gas of diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201843667U true CN201843667U (en) | 2011-05-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205507113U Expired - Fee Related CN201843667U (en) | 2010-09-30 | 2010-09-30 | Atomization injection device for nitric oxide purification reducing agent for tail gas of diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201843667U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042063A (en) * | 2010-09-30 | 2011-05-04 | 中国人民解放军军事交通学院 | Atomizing jet-spray device for reducing agent for purifying exhaust nitric oxide of diesel engine |
| CN102302897A (en) * | 2011-07-30 | 2012-01-04 | 华电电力科学研究院 | Device and method for desulfurization and dust removal by spraying quick lime powder with supersaturation water |
-
2010
- 2010-09-30 CN CN2010205507113U patent/CN201843667U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042063A (en) * | 2010-09-30 | 2011-05-04 | 中国人民解放军军事交通学院 | Atomizing jet-spray device for reducing agent for purifying exhaust nitric oxide of diesel engine |
| CN102302897A (en) * | 2011-07-30 | 2012-01-04 | 华电电力科学研究院 | Device and method for desulfurization and dust removal by spraying quick lime powder with supersaturation water |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110525 Termination date: 20140930 |
|
| EXPY | Termination of patent right or utility model |