CN206221035U - A kind of two-fluid reducing agent injector - Google Patents
A kind of two-fluid reducing agent injector Download PDFInfo
- Publication number
- CN206221035U CN206221035U CN201621303468.9U CN201621303468U CN206221035U CN 206221035 U CN206221035 U CN 206221035U CN 201621303468 U CN201621303468 U CN 201621303468U CN 206221035 U CN206221035 U CN 206221035U
- Authority
- CN
- China
- Prior art keywords
- reducing agent
- gas
- base
- nozzle
- mozzle
- 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
Landscapes
- Treating Waste Gases (AREA)
- Nozzles (AREA)
Abstract
The utility model is related to a kind of two-fluid reducing agent injector, including base, reducing agent mozzle and gas diversion tube, the base is provided with fixing hole, it is characterized in that, the gas diversion tube is inserted vertically into base and is connected with the gas-liquid guide space of horizontally set, the reducing agent mozzle is inserted vertically into base and is connected with reducing agent drainage channel through after gas-liquid guide space, the lower end toper of the reducing agent drainage channel is connected after shrinking with the nozzle on base, the both sides of the reducing agent mozzle are symmetrically arranged with the air flow guide channel being connected with gas-liquid guide space, with nozzle after the lower end toper contraction of the air flow guide channel, the annular spray chamber centered on nozzle formed between base is connected.The beneficial effects of the utility model are：Main body is not in the high temperature gas flow in blast pipe after the injector is installed, and nozzle operation environment is relatively low, and nozzle is difficult crystallization.
Description
Technical field
The utility model is related to a kind of reducing agent injector, more particularly to a kind of two-fluid reducing agent injector, belongs to bavin
Petrol car exhaust aftertreatment technical 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 nozzle, and atomizing effect is poor, simultaneously as its operating ambient temperature is compared with high pass
400-500 DEG C often is can reach, urea nozzle is easily crystallized, cause vehicle after-treatment system failure.
Utility model content
The utility model is not enough present on existing urea emitter construction, there is provided a kind of two-fluid reducing agent injection
Device.
The technical scheme that the utility model solves above-mentioned technical problem is as follows：
A kind of two-fluid reducing agent injector, including base, reducing agent mozzle and gas diversion tube, set on the base
There is fixing hole, it is characterised in that the gas diversion tube is inserted vertically into base and is connected with the gas-liquid guide space of horizontally set
Logical, the reducing agent mozzle is inserted vertically into base and is connected with reducing agent drainage channel through after gas-liquid guide space, institute
It is connected with the nozzle on base after the lower end toper contraction for stating reducing agent drainage channel, before the reducing agent mozzle
Both sides are symmetrically arranged with the air flow guide channel being connected with gas-liquid guide space, the lower end toper of the air flow guide channel afterwards
The annular spray chamber centered on nozzle formed between nozzle, base after contraction is connected.
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
Liquid two-phase obtains relative speed difference to increase aerodynamic force, makes drop in the presence of larger 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,
Effectively using the flowing reduction nozzle temperature of gas can reduce influence of the high temperature to this device, main body after injector installation
It is not in the high temperature gas flow in blast pipe, nozzle operation environment is relatively low, nozzle is difficult crystallization.
3) reducing agent is in independent path in nozzle interior, is only converged in jet hole end face and is atomized, and can effectively reduce urine
Plain solution is because of the too high Crystallization Plugging of temperature；
4) after nozzle is arranged in blast pipe, the direction of spraying inclines at an angle with respect to tail gas direction so that reduction
Agent urea can more fully be contacted with tail gas, and catalysis reduction effect is more preferable, compared with the urea nozzle of conventional one-channel
Compared with, more than 10% is improved in the conversion ratio of nitrogen oxides under the same terms, the effect promoting of tail gas clean-up is obvious；
5) product is made using high temperature brazing technique, and its construction package is simple, it is easy to produces and widely uses.
The operation principle of the utility model injector 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, the upper end of the reducing agent mozzle and gas diversion tube respectively by quick connector, fast twist-on head with
Urea pump is connected.
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, the base is in triangular shape, and three apexes of base are equipped with fixing hole.
Beneficial effect using above-mentioned further scheme is,
Further, the front and rear both sides of the reducing agent mozzle are symmetrically arranged with two groups of air flow guide channels.
Further, the injector is integrally made up of stainless steel material.
Beneficial effect using above-mentioned further scheme is that low cost of manufacture machines component without complexity, it is easy to accomplish.
Further, the injector is integrally made up of soldering processes.
Brief description of the drawings
Fig. 1 is the dimensional structure diagram of the utility model injector；
Fig. 2 is the side view of the utility model injector；
Fig. 3 is the A-A of the utility model injector to sectional view；
Fig. 4 is part B schematic enlarged-scale view；
Fig. 5 is the utility model injector schematic view of the mounting position in blast pipe；
In Fig. 1~4,1, base；2nd, reducing agent mozzle；3rd, gas diversion tube；4th, fixing hole；5th, gas-liquid guide space；
6th, reducing agent drainage channel；7th, nozzle；8th, air flow guide channel；9th, annular spray chamber；10th, quick connector；11st, 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 1-4, a kind of two-fluid reducing agent injector, including base 1, reducing agent mozzle 2 and gas flow guiding
Pipe 3, base is in triangular shape, and three apexes of base are equipped with fixing hole 4, and injector is consolidated by 3 bolts and aiutage
Reservation is connected, and gas diversion tube is inserted vertically into base and is connected with the gas-liquid guide space 5 of horizontally set, reducing agent mozzle
It is inserted vertically into base and is connected with reducing agent drainage channel 6 through after gas-liquid guide space, the lower end of reducing agent drainage channel
Taper is connected after shrinking with the nozzle 7 on base, and the front and rear both sides of reducing agent mozzle are symmetrically arranged with 4 and gas-liquid
The air flow guide channel 8 that guide space is connected, the lower end toper of air flow guide channel is formed after shrinking between nozzle, base
The annular spray chamber 9 centered on nozzle be connected, the upper end of reducing agent mozzle and gas diversion tube is connected to fast inserting
Joint 10 and fast twist-on first 11.
The atomizing effect of the utility model reducing agent injector is illustrated with real data below：
We are carried out using spraying laser particle size analyzer winner318 to the atomizing effect of the utility model injector
Analysis test, with urea liquid as reducing agent, gas is air, and concrete outcome is as follows：
Table 1：The atomizing effect test data of the utility model injector
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 spray of the present invention
The actual atomizing effect of mouth, in above-mentioned experimentation, we are molten using the relatively large engine urea of 7200ml/h
Liquid 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 (6)
1. a kind of two-fluid reducing agent injector, including base, reducing agent mozzle and gas diversion tube, the base are provided with
Fixing hole, it is characterised in that the gas diversion tube is inserted vertically into base and is connected with the gas-liquid guide space of horizontally set,
The reducing agent mozzle is inserted vertically into base and is connected with reducing agent drainage channel through after gas-liquid guide space, described to go back
The lower end toper of former agent drainage channel is connected after shrinking with the nozzle on base, and front and rear the two of the reducing agent mozzle
Side is symmetrically arranged with the air flow guide channel being connected with gas-liquid guide space, and the lower end toper of the air flow guide channel shrinks
The annular spray chamber centered on nozzle for being formed between nozzle, base afterwards is connected.
2. two-fluid reducing agent injector according to claim 1, it is characterised in that the reducing agent mozzle and gas
The upper end of mozzle is connected by quick connector, fast twist-on head with urea pump respectively.
3. two-fluid reducing agent injector according to claim 1, it is characterised in that the base is in triangular shape, base
Three apexes be equipped with fixing hole.
4. two-fluid reducing agent injector according to claim 1, it is characterised in that the reducing agent mozzle it is front and rear
Both sides are symmetrically arranged with two groups of air flow guide channels.
5. two-fluid reducing agent injector according to claim 1, it is characterised in that the injector is overall by stainless steel
Material is made.
6. two-fluid reducing agent injector according to claim 1, it is characterised in that the injector is overall by solderer
Skill is made.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621303468.9U CN206221035U (en) | 2016-11-30 | 2016-11-30 | A kind of two-fluid reducing agent injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621303468.9U CN206221035U (en) | 2016-11-30 | 2016-11-30 | A kind of two-fluid reducing agent injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206221035U true CN206221035U (en) | 2017-06-06 |
Family
ID=58786608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621303468.9U Active CN206221035U (en) | 2016-11-30 | 2016-11-30 | A kind of two-fluid reducing agent injector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206221035U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106337713A (en) * | 2016-11-30 | 2017-01-18 | 烟台盈德精密机械有限公司 | Dual-fluid Reducing Agent Ejector |
| CN114412634A (en) * | 2021-12-24 | 2022-04-29 | 中国北方发动机研究所(天津) | Device for improving heat efficiency of engine and reducing heat load |
-
2016
- 2016-11-30 CN CN201621303468.9U patent/CN206221035U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106337713A (en) * | 2016-11-30 | 2017-01-18 | 烟台盈德精密机械有限公司 | Dual-fluid Reducing Agent Ejector |
| CN114412634A (en) * | 2021-12-24 | 2022-04-29 | 中国北方发动机研究所(天津) | Device for improving heat efficiency of engine and reducing heat load |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203175654U (en) | Mixing system | |
| CN207385184U (en) | A kind of three wear-resisting desulfurization atomising devices of runner air force | |
| CN106437970A (en) | Two-fluid urea nozzle | |
| JPH02223624A (en) | Ammonia mixing device in denitration device | |
| CN206221035U (en) | A kind of two-fluid reducing agent injector | |
| CN101981285A (en) | A nozzle arrangement | |
| CN106670007A (en) | Self-suction double-phase-flow atomizing nozzle | |
| CN104963750A (en) | Static mixing device for SCR system of high-power diesel engine | |
| CN106337713A (en) | Dual-fluid Reducing Agent Ejector | |
| CN103272728B (en) | Silicon controlled rectifier (SCR) system and urea spray nozzle thereof | |
| CN205008133U (en) | Novel outer automobile -used urea nozzle of formula that mixes | |
| CN101036871B (en) | High-pressure liquid air tube type quick mixing reactor | |
| CN105562233A (en) | Nozzle for urea pyrolysis device | |
| CN206205962U (en) | A kind of two-fluid urea nozzle | |
| CN201871432U (en) | Atomizing spray nozzle structure used for spraying liquid reducing agents in SCR (selective catalytic reduction) system | |
| CN201524627U (en) | Spray gun nozzle for intersection-converge spraying outside the spray gun | |
| CN112774891A (en) | Double-fluid nozzle | |
| CN205101083U (en) | Be applied to self -excited oscillation of marine diesel SCR system pulse atomizing nozzle | |
| CN104948276A (en) | Air assisting type urea ejector | |
| CN208894002U (en) | A kind of low pressure atomization nozzle applied to sprinkling irrigation | |
| CN102913310A (en) | SCR (selective catalytic reduction) post-processing nozzle for increasing conversion rate of NOx (nitrogen oxides) | |
| CN202240910U (en) | Nozzle used for atomizing and cooling in grinding process | |
| CN105240095A (en) | SCR system self-oscillation pulse atomization nozzle applied to marine diesel engine | |
| CN103657894A (en) | Atomizing nozzle for urea-pyrolysis ammonia preparation process and solution atomizing device | |
| CN106523100A (en) | Axial injection urea injector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |