CN206205962U - A kind of two-fluid urea nozzle - Google Patents
A kind of two-fluid urea nozzle Download PDFInfo
- Publication number
- CN206205962U CN206205962U CN201621308078.0U CN201621308078U CN206205962U CN 206205962 U CN206205962 U CN 206205962U CN 201621308078 U CN201621308078 U CN 201621308078U CN 206205962 U CN206205962 U CN 206205962U
- Authority
- CN
- China
- Prior art keywords
- urea
- nozzle
- nozzle body
- mozzle
- air
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The utility model is related to a kind of two-fluid urea nozzle, including nozzle body, urea mozzle and airflow duct, it is connected with urea drainage channel in the lower end insertion nozzle body of urea mozzle, communicated with the conducting space enclosed by heat shield in the lower end insertion nozzle body of airflow duct, urea mozzle is passed through from conducting space, the lower section for turning on space is connected with air conduction passage, the L-shaped nozzle core with located at nozzle body side of urea drainage channel is connected, the lower end outlet of air conduction passage is inclined after narrowing towards the side of nozzle body and is connected with air spray chamber, air spray chamber is annular in shape centered on nozzle core.The beneficial effects of the utility model are：Reducing agent is in independent path in nozzle interior, is only converged in jet hole end face and is atomized, and can effectively reduce urea liquid because of the too high Crystallization Plugging of temperature；Gas and fluid path are integral type structure in nozzle body part, can effectively using the flowing reduction nozzle temperature of gas.
Description
Technical field
The utility model is related to a kind of nozzle, more particularly to a kind of urea nozzle, belongs to diesel automobile exhaust post processing skill
Art field.
Background technology
Main pollutant is NOx in diesel engine vent gas, to cause that diesel engine automobile reaches national emission regulation demands, I
The main technological route of state is exactly SCR (SCR), with urea liquid as reducing agent in SCR aftertreatment system
To remove the nitrogen oxides in diesel engine vent gas, so as to reach the requirement of the corresponding Abgasgesetz of country.The work of the system is former
Reason is：Tail gas enters blast pipe, and urea nozzle is provided with blast pipe, sprays into urea for vehicle solution, and urea is sent out at high temperature
Generate ammonia after unboiled water solution and pyrolytic reaction, inside catalyst converter, ammonia and nitrogen oxides occur reduction reaction, generation nitrogen and
Water, so as to reach the effect of cleaning of off-gas.
It is well known that, reducing agent injection apparatus are the core component of SCR aftertreatment system, the control of its spray effect, urine
The accuracy of spray and atomizing effect of plain solution are the keys for ensureing catalyst conversion efficiency, and are using pressure in the prior art
Contracting air carries out mixed aerosol with urea liquid in urea measuring pump, because Tail Pipe Temperature is too high, can cause urea liquid
Highly volatile or the crystallization at high temperature of the gas-liquid mixture of generation, result in blockage nozzle, while can also influence the dense of urea liquid
Spend so as to cause effect and the accuracy of spray reduction of the jet atomization of urea liquid, used cooperatively with urea pump in the case of a high temperature
Urea nozzle also easily crystallize.
The automobile-used reducing agent injection apparatus of Most current (being also urea nozzle) is generally using the injection of single channel gas-liquid mixed
Atomization, i.e., be ejected into exhaust after urea measuring pump high pressure directly mixes urea liquid and compressed gas by urea nozzle
Guan Li, urea liquid is in gas-liquid mixture phase in blast pipe, and atomizing effect is poor, simultaneously as its operating ambient temperature is higher
400-500 DEG C is generally reached, urea nozzle is easily crystallized, cause vehicle after-treatment system failure.
Chinese patent application CN104948276 discloses a kind of air-assisted urea injector, which employs urea and
Air binary channels sample introduction, mixed aerosol when nozzle sprays, including Thermal packer, air hose, urea tube and nozzle, air hose with every
Hot device is communicated, and urea tube passes through Thermal packer, and nozzle is provided with air jet orifices and urea spray orifice, during air jet orifices are with urea spray orifice
The heart arranges that the structure of nozzle is as follows in turbine-like：Nozzle body is cone, and urea spray orifice is located at the center of nozzle body, is sprayed
The circular conical surface of mouth main body is provided with one group of groove, and nozzle end lid is fastened on nozzle body and forms air chamber, spray with nozzle body
Mouth end cap forms air jet orifices with groove, and air hose is connected by the intercommunicating pore being located on nozzle body with air chamber, the structure
Urea nozzle be installed on when in blast pipe, urea tube and air hose are directly contact high-temperature tail gas, and its heat-insulation chamber is not
Its bend pipe with tail gas directly contact can be protected, and two sections of structures of bend pipe are separate and contactless, so for utilizing
Compressed air prevented to lower the temperature crystallization effect it is unsatisfactory, and the structure nozzle air spray orifice into turbine-like in urea
Around spray orifice, the groove-like structure of a plurality of turbine-like causes that air-flow disperses at gas outlet in internal structure, and direction is inconsistent, gas
Gas kinetic energy rejection, thus the turbine structure of spiral is caused not to be obviously improved to atomizing effect in stream knock-on process.
Utility model content
A kind of deficiency that the utility model exists for existing two-fluid urea nozzle, there is provided two-fluid urea nozzle.
The technical scheme that the utility model solves above-mentioned technical problem is as follows：
A kind of two-fluid urea nozzle, including nozzle body, urea mozzle and airflow duct, it is characterised in that institute
State and be connected with urea drainage channel in the lower end insertion nozzle body of urea mozzle, the lower end insertion of the airflow duct
Communicated with the conducting space enclosed by heat shield in nozzle body, the urea mozzle is passed through from conducting space, institute
The bottom for stating conducting space is connected with air conduction passage, and the urea drainage channel is L-shaped and is located at nozzle body side
The nozzle core in face is connected, and the lower end outlet of the air conduction passage is inclined after narrowing and air towards the side of nozzle body
Spray chamber is connected, and the air spray chamber is annular in shape centered on nozzle core.
The beneficial effects of the utility model are：
1) tapering transition is used in the pipeline diameter change procedure of nozzle spray-orifice structure, the damage of gas kinetic energy is reduced
Lose, fluid column is wrapped up in the gas outlet of nozzle into uniform rings shape, gas outlet gas flow is consistent, the axial comprehensive contact high pressure of liquid
Gas produces atomization, and particle diameter is presented the axisymmetric regularity of distribution, and particle diameter point on its nebulization region downstream section
Than more uniform, the gas phase flow rate of nozzle constantly changes cloth with nozzle liquid pressure change in actual use, increases gas
The relative speed difference of liquid two-phase makes drop in the presence of larger aerodynamic force to increase aerodynamic force, crushes thinner, it is ensured that pin
Preferable atomizing effect can be obtained to different injection flows；
2) there is conducting space in nozzle body part, gas and fluid path are integral type structure in space is turned on,
Heat effectively can be taken away so as to reduce the temperature of urea liquid using the flowing of gas, in addition, air conduction passage, urea draw
Circulation road is integral type structure with nozzle body, is not exposed in blast pipe, and the structure can be to the urea in drainage channel
Solution plays the effect of being effectively protected, and makes it be difficult to be influenceed by ambient temperature, can also effectively reduce the high temperature pair of blast pipe
The influence of urea liquid crystallization；
3) reducing agent is in independent path in nozzle interior, and conducting space is formed due to be have passed through during its circulation
Heat shield protection, only jet hole end face converge be atomized, can effectively reduce urea liquid because of the too high Crystallization Plugging of temperature；
4) after nozzle is arranged in blast pipe, the atomization air flow of reducing agent urea is consistent with exhaust gas flow direction so that also
Former agent urea can more fully be contacted with tail gas, and more preferably, the effect of tail gas clean-up is more preferable for catalysis reduction effect；
5) product is made using high temperature brazing technique, it is easy to is produced and is widely used.
The operation principle of the utility model nozzle is as follows：
When urea liquid sprays by nozzle, liquid level is launched into when flowing through nozzle bore limit, then becomes drop, urinated
Plain solution strengthens the flowing that urea liquid exports surrounding flow by the high-speed jet of air fluid coaxial direction, and compression is empty
The fluid column of gas and low-velocity liquid, the generation vibration that contacts with each other, friction make liquid crushing be rubbed to liquid for fine drop, i.e. air
Wipe active force makes liquid crushing stream stock or liquid film more than the internal force of liquid.It is mutual in surface tension of liquid, viscosity and air drag
Under effect, liquid is gradually changed by drippage, smooth flow, the wavy spray flow that flows to, and is ultimately formed taper atomization face and is mixed with tail gas
And then participate in the chemical reaction of after-treatment system.
On the basis of above-mentioned technical proposal, the utility model can also do following improvement.
Further, heat shield lid is provided with above the heat shield, the heat shield is covered and is provided with alignment pin.
Beneficial effect using above-mentioned further scheme is urea nozzle more easily can be installed on into blast pipe
It is interior.
Further, the urea mozzle is connected by quick connector, fast twist-on head with urea pump respectively.
Beneficial effect using above-mentioned further scheme is that easily the urea jet and air with urea measuring pump go out
Mouth is connected.
Further, inserted in nozzle body after the airflow duct, the bending of urea mozzle, to adapt in blast pipe
Installing space.
Beneficial effect using above-mentioned further scheme be can be installed on various different structures and construction blast pipe or
Inside catalyst converter, have a wide range of application.
Further, the nozzle body, urea mozzle and airflow duct are made of stainless steel.
Beneficial effect using above-mentioned further scheme is that construction package low cost of manufacture, integral product is easily achieved.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the utility model urea nozzle；
Fig. 2 is the utility model urea nozzle transversely centerline sectional view；
Fig. 3 is part A amplification assumption diagram in Fig. 2；
In Fig. 1~3,1, nozzle body；2nd, urea mozzle；3rd, airflow duct；4th, urea drainage channel；5th, it is heat-insulated
Cover；6th, space is turned on；7th, air conduction passage；8th, nozzle core；9th, air spray chamber；10th, heat shield lid；11st, alignment pin；12nd, it is fast
Connection-peg；13rd, fast twist-on head
Specific embodiment
Principle of the present utility model and feature are described below in conjunction with example, example is served only for explaining this practicality
It is new, it is not intended to limit scope of the present utility model.
As shown in Figures 1 to 3, a kind of two-fluid urea nozzle, including nozzle body 1, urea mozzle 2 and airflow duct
3, it is connected with urea drainage channel 4 in the lower end insertion nozzle body of urea mozzle, airflow duct is led towards near urea
In the direction bending posterior end insertion nozzle body of flow tube, the lower end of airflow duct and the conducting enclosed by heat shield 5
Space 6 is communicated, and urea mozzle is passed through from conducting space, and the lower section for turning on space is connected with air conduction passage 7, urea
The L-shaped nozzle core 8 with located at nozzle body side of drainage channel is connected, the lower end outlet direction spray of air conduction passage
The side of mouth main body inclines after narrowing and is connected with air spray chamber 9, and air spray chamber is annular in shape centered on nozzle core, heat shield
Top is provided with heat shield lid 10, and heat shield is covered and is provided with alignment pin 11, the cooperation that urea nozzle passes through heat shield lid and alignment pin
It is connected with the nozzle fixed seat of blast pipe and is locked with nut piece, urea mozzle, airflow duct is connected by its upper end respectively
The quick connector 12 that connects, fast twist-on first 13 are connected with the urea jet and air outlet slit of urea measuring pump.
Measuring pump ejects the urea liquid of theory demands, urea according to the calculating of system DCU in SCR aftertreatment system
Reducing agent by nozzle core spray spray, compressed air by airflow duct and conducting space after, injector end face with
Urea liquid gas-liquid crosses, and because gas flow rate and pressure are much larger than flow rate of liquid and pressure, liquid is broken up and formed by gas
Atomizing effect, and air-flow inertia drive under spray distance it is farther, formed diffusion taper shape nebulization region, this region and
The nitrogen oxides during chemical reaction reduces tail gas is carried out after tail gas mixing.
The atomizing effect of the utility model urea nozzle is illustrated with real data below：
We have carried out analysis to the atomizing effect of nozzle of the present invention and have surveyed using spraying laser particle size analyzer winner318
Examination, concrete outcome is as follows：
Table 1：The atomizing effect test data of the utility model urea nozzle
Wherein, VAD represents volume weighting average grain diameter；NAD represents quantity weight mean particle size；SMD represents that surface area adds
Weight average particle diameter.
In atomization process, the bigger atomizing effect of current difference of gas-liquid two-phase is better, but in order to really verify the present invention
The actual atomizing effect of nozzle, in above-mentioned experimentation, we use the relatively large engine urea of 7200ml/h
Solution emitted dose tests the atomizing effect of urea liquid.
Preferred embodiment of the present utility model is the foregoing is only, is not used to limit the utility model, it is all in this practicality
Within new spirit and principle, any modification, equivalent substitution and improvements made etc. should be included in guarantor of the present utility model
Within the scope of shield.
Claims (5)
1. a kind of two-fluid urea nozzle, including nozzle body, urea mozzle and airflow duct, it is characterised in that described
It is connected with urea drainage channel in the lower end insertion nozzle body of urea mozzle, the lower end insertion spray of the airflow duct
Communicated with the conducting space enclosed by heat shield in mouth main body, the urea mozzle is passed through from conducting space, described
The bottom for turning on space is connected with air conduction passage, and the urea drainage channel is L-shaped and is located at nozzle body side
Nozzle core be connected, the outlet of the lower end of the air conduction passage is inclined after narrowing towards the side of nozzle body sprays with air
Chamber is connected, and the air spray chamber is annular in shape centered on nozzle core.
2. two-fluid urea nozzle according to claim 1, it is characterised in that be provided with heat shield above the heat shield
Lid, the heat shield is covered and is provided with alignment pin.
3. two-fluid urea nozzle according to claim 1, it is characterised in that the urea mozzle, airflow duct
Upper end respectively by quick connector, fast twist-on head be connected with urea pump.
4. the two-fluid urea nozzle according to any one of claim 1-3, it is characterised in that the airflow duct,
Inserted in nozzle body after the bending of urea mozzle, to adapt to the installing space in blast pipe.
5. the two-fluid urea nozzle according to any one of claim 1-3, it is characterised in that the nozzle body, urine
Plain mozzle and airflow duct are made of stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621308078.0U CN206205962U (en) | 2016-11-30 | 2016-11-30 | A kind of two-fluid urea nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621308078.0U CN206205962U (en) | 2016-11-30 | 2016-11-30 | A kind of two-fluid urea nozzle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206205962U true CN206205962U (en) | 2017-05-31 |
Family
ID=58754268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621308078.0U Active CN206205962U (en) | 2016-11-30 | 2016-11-30 | A kind of two-fluid urea nozzle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206205962U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106437970A (en) * | 2016-11-30 | 2017-02-22 | 烟台盈德精密机械有限公司 | Two-fluid urea nozzle |
-
2016
- 2016-11-30 CN CN201621308078.0U patent/CN206205962U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106437970A (en) * | 2016-11-30 | 2017-02-22 | 烟台盈德精密机械有限公司 | Two-fluid urea nozzle |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8240137B2 (en) | Reductant injection and decomposition system | |
| CN106437970A (en) | Two-fluid urea nozzle | |
| JPH02223624A (en) | Ammonia mixing device in denitration device | |
| CN207385184U (en) | A kind of three wear-resisting desulfurization atomising devices of runner air force | |
| CN101371969A (en) | Reducing reagent nozzle for denitration by SNCR method | |
| CN201389432Y (en) | Ammonia and air counterflow mixer of ammonia injection and denitration system in heat power plant | |
| CN206221035U (en) | A kind of two-fluid reducing agent injector | |
| CN206205962U (en) | A kind of two-fluid urea nozzle | |
| CN103272728B (en) | Silicon controlled rectifier (SCR) system and urea spray nozzle thereof | |
| CN205008133U (en) | Novel outer automobile -used urea nozzle of formula that mixes | |
| CN103256106A (en) | SCR (selective catalytic reduction) injection system without pneumatic assistance | |
| CN207667856U (en) | Multistage atomizing nozzle and multistage atomizing device | |
| CN106337713A (en) | Dual-fluid Reducing Agent Ejector | |
| CN101036871B (en) | High-pressure liquid air tube type quick mixing reactor | |
| CN105562233A (en) | Nozzle for urea pyrolysis device | |
| CN203822427U (en) | Selective catalytic reduction denitration system for tail gas of ship diesel machine | |
| CN112774891A (en) | Double-fluid nozzle | |
| CN205101083U (en) | Be applied to self -excited oscillation of marine diesel SCR system pulse atomizing nozzle | |
| CN201760232U (en) | Spray gun type double-flow nozzle for denitration of smoke | |
| CN209885487U (en) | Venturi scrubbing tower | |
| CN209576252U (en) | A kind of denitration spray gun | |
| CN210438423U (en) | Ammonia gas generating device | |
| CN206935077U (en) | Denitration pipette tips | |
| CN215964212U (en) | Long-neck type urea solution high-temperature atomizing nozzle for jetting against gravity | |
| CN209596902U (en) | A kind of spray ammonia conglomerate integration AIG for Gas Generator Set waste heat boiler |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |