CN106870073A - A kind of efficient crystallization-preventive urea nozzle - Google Patents
A kind of efficient crystallization-preventive urea nozzle Download PDFInfo
- Publication number
- CN106870073A CN106870073A CN201710212974.XA CN201710212974A CN106870073A CN 106870073 A CN106870073 A CN 106870073A CN 201710212974 A CN201710212974 A CN 201710212974A CN 106870073 A CN106870073 A CN 106870073A
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- Prior art keywords
- urea
- air
- mozzle
- preventive
- nozzle body
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 175
- 239000004202 carbamide Substances 0.000 title claims abstract description 175
- 239000007788 liquid Substances 0.000 claims abstract description 53
- 238000002347 injection Methods 0.000 claims abstract description 27
- 239000007924 injection Substances 0.000 claims abstract description 27
- 230000007704 transition Effects 0.000 claims abstract description 15
- 239000007921 spray Substances 0.000 claims description 21
- 210000003127 knee Anatomy 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 16
- 238000000889 atomisation Methods 0.000 abstract description 8
- 230000009467 reduction Effects 0.000 abstract description 5
- 238000006555 catalytic reaction Methods 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 17
- 238000009792 diffusion process Methods 0.000 description 9
- 230000008859 change Effects 0.000 description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 5
- 230000008676 import Effects 0.000 description 5
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 5
- 238000006722 reduction reaction Methods 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 210000003205 muscle Anatomy 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 210000002700 urine Anatomy 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1486—Means to prevent the substance from freezing
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Nozzles (AREA)
Abstract
The present invention relates to a kind of efficient crystallization-preventive urea nozzle, including nozzle body, nozzle body top is connected with airflow duct, urea mozzle, and nozzle body is in cylinder, nozzle body lower end side is provided with jet face, and injection extends towards nozzle body inside and forms ejector block；Cavity, cavity connection airflow duct are provided with inside nozzle body；Ejector block center connects urea mozzle, urea mozzle arc-shaped transition to ejector block center, and urea mozzle extends to jet face and forms urea liquid outlet；Ejector block forms air ring cavity in the periphery of urea mozzle, air ring cavity includes air introduction segment, air caching section, air injection section, air introduction segment is arranged on air ring cavity edge, air introduction segment end connection air caching section, air caching section connection air injection section, air injection section extends to jet face and forms air outlet slit.Present invention ejection is smooth, and atomization is uniform, preferably plays the effect of catalysis reduction tail gas.
Description
Technical field
The present invention relates to a kind of urea nozzle, more particularly to a kind of efficient crystallization-preventive urea nozzle belongs to diesel engine vent gas
Post-processing technology 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.
Applied for a kind of two-fluid urea nozzle before inventor, by the lower end of urea mozzle insertion nozzle body with
Urea drainage channel is connected, with the conducting space enclosed by heat shield in the lower end insertion nozzle body of airflow duct
Communicate, urea mozzle is passed through from conducting space, and the bottom for turning on space is connected with air conduction passage, and urea drainage is led to
The L-shaped nozzle core with located at nozzle body side in road is connected, and the lower end of air conduction passage is exported towards nozzle body
Side incline narrow after be connected with air spray chamber, air spray chamber centered on nozzle core annularly.Urea in the invention
Drainage channel, air conduction passage have a segment distance more long, while nozzle tendency is drawn perpendicular to urea drainage channel, air
Circulation road, although atomizing effect improves significantly compared with common product, but also there is certain deficiency, the gas in urea nozzle
Flow drastically to change at nozzle with urea liquid and be unable to smooth transition, urea drainage channel, air conduction passage are more long in addition, spray
Penetrate effect and also there is certain deficiency.
The content of the invention
The present invention in view of the shortcomings of the prior art, there is provided a kind of efficient crystallization-preventive urea nozzle, jeting effect than
Preceding product improves significantly, and sprays smooth, and crystallization risk is low.
The technical scheme that the present invention solves above-mentioned technical problem is as follows：A kind of efficient crystallization-preventive urea nozzle, including nozzle
Housing, described nozzle body top is connected with airflow duct, urea mozzle, and described nozzle body is in cylinder, spray
Mouth housing lower end side is provided with jet face, and described jet face is in half elliptic, and injection extends towards nozzle body inside and formed
Ejector block；Cavity, the described airflow duct of cavity connection are provided with inside described nozzle body；Described ejector block and level
The angle in face is 30 to 75 degree, the described urea mozzle of ejector block center connection, and urea mozzle arc-shaped transition is described in
Ejector block center, urea mozzle extends to described jet face and forms urea liquid outlet；Described ejector block is led in urea
The periphery of flow tube forms air ring cavity, and described air ring cavity includes air introduction segment, air caching section, air injection section, empty
Gas introduction segment is arranged on described air ring cavity edge, and the described air caching section of air introduction segment end connection, air delays
The described air injection section of section connection is deposited, air injection section extends to described jet face and forms air outlet slit.
A kind of efficient crystallization-preventive urea nozzle as described above, described nozzle body side is provided with alignment pin.Alignment pin
For whole urea nozzle to be installed into blast pipe, urea nozzle play is prevented, strengthen mounting stability.
A kind of efficient crystallization-preventive urea nozzle as described above, described airflow duct head end is provided with fast twist-on head, soon
The first side of twist-on is provided with air and shoots out chamber, airflow duct connection urea pump gas outlet.Fast twist-on head can quickly by air
Mozzle combines connection with urea pump gas outlet.
A kind of efficient crystallization-preventive urea nozzle as described above, described urea mozzle head end connection urea pumps out liquid
Mouthful.Urea liquid is entered by urea mozzle derived from urea pump liquid outlet.
A kind of efficient crystallization-preventive urea nozzle as described above, described air introduction segment is in annular shape, air caching section
The backward described air injection section that inside gradually broadens draws in.Air introduction segment makes the air for entering cavity import air ring cavity, enters
Enter inflow air caching section, the air injection section gathering that air caching section gradually broadens described backward after air ring cavity.From air
The air that ingress pipe enters in cavity, can not only form ring-type parcel around urea mozzle, can also make air flow
The thermal current heat of nozzle body absorption is taken away, so as to play good fluid path protective effect, air inlet injection in addition
The strong discharge of the strong muscle of air of section, makes urea liquid preferably be atomized, and further prevents urea crystals from occurring.
A kind of efficient crystallization-preventive urea nozzle as described above, described air outlet slit surrounds described urea liquid and goes out
Mouthful.Urea liquid is exported and surrounded by air outlet slit, and 360 degree of the urea liquid that urea liquid can be made to export discharge is subject to without dead angle
The gas shock of air outlet slit discharge, atomization is uniform, while urea liquid is difficult to be gathered into drop, mist in urea liquid exit
Change thorough.
A kind of efficient crystallization-preventive urea nozzle as described above, described urea mozzle upper end at right angles bends, and bends
Place uses arc-shaped transition.Urea mozzle is designed to different curved shapes, so as to adapt to different mounting locations.
A kind of efficient crystallization-preventive urea nozzle as described above, institute is extended vertically into after described urea mozzle arc-shaped transition
The ejector block center stated.Ejector block center is extended vertically into after urea mozzle arc-shaped transition, so that urea liquid will spray
When going out, direction does not occur drastically to change, and urea liquid retains vertical being exported from urea liquid of certain speed and sprays, and sprays suitable
Freely, it is atomized uniformly, preferably plays the effect of catalysis reduction tail gas.
A kind of efficient crystallization-preventive urea nozzle as described above, described urea mozzle is exported in described urea liquid
Place narrows.Urea mozzle narrows in urea liquid exit, so that urea liquid has larger kinetic energy in exit, spray
Go out effect good.
The beneficial effects of the invention are as follows：
In annular shape, the backward described air injection section that gradually broadened in air caching section draws in air introduction segment.Air
Introduction segment make enter cavity air import air ring cavity, after air inlet ring cavity flow into air caching section, air cache section by
Gradual change backward described air injection section wide draws in, the discharge that the strong muscle of air of air inlet jet segment can be made strong, so that
Urea liquid is preferably atomized, prevent urea crystals from occurring；
Described ejector block center is extended vertically into after urea mozzle arc-shaped transition.It is vertical after urea mozzle arc-shaped transition
Ejector block center is stretched into, so that urea liquid is when that will spray, direction does not occur drastically to change, urea liquid retains certain
Vertical being exported from urea liquid of speed spray, spray smooth, atomization is uniform, preferably plays the effect of catalysis reduction tail gas
Really.
Brief description of the drawings
Fig. 1 is efficient crystallization-preventive urea nozzle structural representation；
Fig. 2 is efficient crystallization-preventive urea nozzle internal structure schematic diagram；
Fig. 3 is partial enlarged drawing at efficient crystallization-preventive urea nozzle air ring cavity；
Fig. 4 is partial enlarged drawing at efficient crystallization-preventive urea nozzle jet face；
Fig. 5 is efficient crystallization-preventive urea nozzle side view；
Fig. 6 is the efficient crystallization-preventive urea nozzle structural representation that urea mozzle at right angles bends；
Fig. 7 is efficient crystallization-preventive urea nozzle assembly structure diagram；
Fig. 8 is conventional urea nozzle NH3Mass fraction cloud atlas；
Fig. 9 is urea nozzle NH of the invention3Mass fraction cloud atlas；
Figure 10 is conventional urea nozzle H2O mass fraction cloud atlas；
Figure 11 is urea nozzle H of the invention2O mass fraction cloud atlas；
Wherein, 1, nozzle body；2nd, airflow duct；3rd, urea mozzle；4th, jet face；5th, ejector block；6th, cavity；7、
Urea liquid is exported；8th, air ring cavity；801st, air introduction segment；802nd, air caching section；803rd, air injection section；9th, air goes out
Mouthful；10th, alignment pin；11st, fast twist-on head；12nd, air shoots out chamber.
Specific embodiment
To enable the above objects, features and advantages of the present invention more obvious understandable, below in conjunction with the accompanying drawings to the present invention
Specific embodiment be described in detail.Elaborate many details in order to fully understand this hair in the following description
It is bright.But the present invention can be implemented with being much different from other manner described here, and those skilled in the art can be not
Similar improvement is done in the case of running counter to intension of the present invention, therefore the present invention is not limited by following public specific embodiment.
It should be noted that when element is referred to as " being fixed on " or " being arranged at " another element, it can be directly another
On one element or can also there is element placed in the middle.When an element is considered as " connection " another element, it can be with
It is directly to another element or may be simultaneously present centering elements.Term as used herein " vertical ", " level
", "left", "right" and similar statement for illustrative purposes only, it is unique implementation method to be not offered as.
Unless otherwise defined, all of technologies and scientific terms used here by the article with belong to technical field of the invention
The implication that technical staff is generally understood that is identical.The term for being used in the description of the invention herein is intended merely to description tool
The purpose of the implementation method of body, it is not intended that in the limitation present invention.Term as used herein "and/or" includes one or more
The arbitrary and all of combination of related Listed Items.
As shown in Figure 1, Figure 2, shown in Fig. 4, Fig. 5, Fig. 7, a kind of efficient crystallization-preventive urea nozzle, including nozzle body 1, nozzle housing
The top of body 1 is connected with airflow duct 2, urea mozzle 3, and in cylinder, the lower end side of nozzle body 1 is provided with nozzle body 1
Jet face 4, jet face 4 is in half elliptic, and jet face 4 forms ejector block 5 to extension inside nozzle body 1；Inside nozzle body 1
It is provided with cavity 6, the connection airflow duct 2 of cavity 6；Ejector block 5 is 30 to 75 degree with the angle of horizontal plane, and the center of ejector block 5 connects
Logical urea mozzle 3, the arc-shaped transition of urea mozzle 3 to the center of ejector block 5, urea mozzle 3 extends to jet face 4 and forms urine
Plain taphole 7；Ejector block 5 forms air ring cavity 8 in the periphery of urea mozzle 3, and air ring cavity 8 includes air introduction segment
801st, air caching section 802, air injection section 803, air introduction segment 801 are arranged on the edge of air ring cavity 8, air introduction segment
801 ends connection air caching section 802, the air caching connection air injection section 803 of section 802, air injection section 803 extends to spray
Penetrate face 4 and form air outlet slit 9.
The side of nozzle body 1 is provided with alignment pin 10.Alignment pin 10 is used to for whole urea nozzle to be installed to blast pipe, prevents
Only urea nozzle play, strengthens mounting stability.
The head end of airflow duct 2 is provided with fast twist-on first 11, and fast first 11 side of twist-on is provided with air and shoots out chamber 12, air conducting
The connection urea pump of pipe 2 gas outlet.Airflow duct 2 quickly can be combined connection by fast twist-on first 11 with urea pump gas outlet.
The head end of urea mozzle 3 connects urea pump liquid outlet.Urea liquid derived from urea pump liquid outlet is led by urea
Flow tube 3 enters.
As shown in figure 3, air introduction segment 801 is in annular shape, gradually broaden backward air injection section in air caching section 802
803 draw in.Air introduction segment 801 makes the air for entering cavity 6 import air ring cavity 8, air is flowed into after air inlet ring cavity 8 and is delayed
Deposit section 802, the air caching section 802 backward air injection section 803 that gradually broadens draws in, can make air inlet jet segment 803
The strong discharge of the strong muscle of air, so that urea liquid is preferably atomized, prevents urea crystals from occurring.
Air outlet slit 9 surrounds urea liquid outlet 7.Air outlet slit 9 surrounds urea liquid outlet 7, and urea can be made molten
360 degree of the urea liquid of the discharge of liquid outlet 7 is subject to the gas shock of the discharge of air outlet slit 9 without dead angle, and atomization is uniform, while urea
Solution is difficult to be gathered into drop at urea liquid outlet 7, and atomization is thorough.
The center of ejector block 5 is extended vertically into after the arc-shaped transition of urea mozzle 3.Vertically stretched after the arc-shaped transition of urea mozzle 3
Enter the center of ejector block 5, so that urea liquid is when that will spray, direction does not occur drastically to change, urea liquid retains certain
Speed it is vertical sprayed from urea liquid outlet 7, spray smooth, atomization is uniform, preferably plays the effect of catalysis reduction tail gas
Really.
Urea mozzle 3 narrows at urea liquid outlet 7.Urea mozzle 3 narrows at urea liquid outlet 7, from
And make urea liquid that there is larger kinetic energy in exit, spray effect good.
As shown in fig. 6, efficiently in one embodiment of crystallization-preventive urea nozzle, the upper end of urea mozzle 3 at right angles bends,
Knee uses arc-shaped transition.Urea mozzle 3 is designed to different curved shapes, so as to adapt to different mounting locations.
Fluid analysis are carried out in same aiutage with traditional urea nozzle by the present invention, two models of contrast
NH3、H2The diffusion area of O.As follows specifically are set to import and export and boundary condition in fluent：
1. import arrange parameter：
1)mass flow rate：0.0347754 kg/s
2)direction specification method：Normal to Boundary
3)Turbulent Intensity：5%
4)Turbulent Viscosity Ratio：5
5)Total Temperature：400℃
7)Discrete Phase BC Type：escape
2. arrange parameter is exported：
1)Backflow Turbulent Intensity：5%
2)Backflow Turbulent Viscosity Ratio：5
3)Backflow Total Temperature：400℃
4)Species：all the species have their mass fractions set to 0
5)Discrete Phase BC Type：escape
3. jet parameter：
1)Injection Type：solid-cone
2)Number of Particle Streams：10
3)Particle Type：Multicomponent
4)Material：urea-water
5)Diameter Distribution：rosin-rammler
6)Temperature：20℃
7)Azimuthal Start Angle：0(deg)
8)Azimuthal Start Angle：360(deg)
9)Velocity Magnitude：20m/s
10)Cone Angle：10(deg)
11)Radius：6.25e-02mm
12)Total Flow Rate：0.0001798kg/s
13)Min.Diameter：4e-03mm
14)Max.Diameter：8e-02mm
15)Mean Diameter：5e-02mm
16)Spread Parameter：3.5
17)Number of Diameters：5
4. barrel parameter setting：
1)Thermal Conditions：Convection
2)Heat Transfer Coefficient：10(w/m2-k)
3)Free Stream Temperature：-30℃
4)Wall Thickness：2.46e-02mm
5)Boundary Cond：wall-film
6)Number Of Splashed Drops：4
As shown in figure 8, the NH of conventional urea nozzle model3Mass fraction cloud atlas, its NH3Diffusion area is about 23%.
As shown in figure 9, urea nozzle model NH of the invention3Mass fraction cloud atlas, its NH3Diffusion area is about 35%.
As shown in Figure 10, the H of conventional urea nozzle model2O mass fraction cloud atlas, its H2O diffusion areas are about 25%.
As shown in figure 11, the H of urea nozzle model of the invention2O mass fraction cloud atlas, its H2O diffusion areas are about
42%.
Can be obtained by contrast, NH3Diffusion area：Conventional urea nozzle is about 23%, and urea nozzle of the invention is about
It is 35%, NH of the invention3Diffusion area lifting 152%.
H2O diffusion areas：Conventional urea nozzle is about 25%, and urea nozzle of the invention is about 42%, H of the invention2O
Diffusion area lifting 168%.The present invention has efficient jeting effect relative to conventional urea nozzle, can effectively act as preventing
The only effect of urea crystals.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, the scope of this specification record is all considered to be.
Embodiment described above only expresses several embodiments of the invention, and its description is more specific and detailed, but simultaneously
Can not therefore be construed as limiting the scope of the patent.It should be pointed out that coming for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of efficient crystallization-preventive urea nozzle, including nozzle body, described nozzle body top be connected with airflow duct,
Urea mozzle, it is characterised in that：Described nozzle body is in cylinder, and nozzle body lower end side is provided with jet face, described
Jet face be in half elliptic, injection towards nozzle body inside extend form ejector block；It is provided with inside described nozzle body
Cavity, the described airflow duct of cavity connection；Described ejector block is 30 to 75 degree, ejector block center with the angle of horizontal plane
The described urea mozzle of connection, urea mozzle arc-shaped transition to described ejector block center, urea mozzle extends to institute
The jet face stated forms urea liquid outlet；Described ejector block forms air ring cavity in the periphery of urea mozzle, described
Air ring cavity includes air introduction segment, air caching section, air injection section, and air introduction segment is arranged on described air ring cavity side
At edge, the described air caching section of air introduction segment end connection, the described air injection section of air caching section connection, air spray
Penetrate section and extend to described jet face formation air outlet slit.
2. a kind of efficient crystallization-preventive urea nozzle according to claim 1, it is characterised in that：Described nozzle body side
It is provided with alignment pin.
3. a kind of efficient crystallization-preventive urea nozzle according to claim 1, it is characterised in that：Described airflow duct is first
End is provided with fast twist-on head, and the fast first side of twist-on is provided with air and shoots out chamber.
4. a kind of efficient crystallization-preventive urea nozzle according to claim 3, it is characterised in that：Described airflow duct connects
Chamber pot element pumps out gas port.
5. a kind of efficient crystallization-preventive urea nozzle according to claim 1, it is characterised in that：Described urea mozzle is first
End connection urea pump liquid outlet.
6. a kind of efficient crystallization-preventive urea nozzle according to claim 1, it is characterised in that：Described air introduction segment is in
Annular shape, the backward described air injection section that gradually broadened in air caching section draws in.
7. a kind of efficient crystallization-preventive urea nozzle according to claim 1, it is characterised in that：Described air outlet slit is surrounded
Described urea liquid outlet.
8. a kind of efficient crystallization-preventive urea nozzle according to claim 1, it is characterised in that：Described urea mozzle arc
Described ejector block center is extended vertically into after shape transition.
9. a kind of efficient crystallization-preventive urea nozzle according to claim 1, it is characterised in that：Described urea mozzle exists
Described urea liquid exit narrows.
10. a kind of efficient crystallization-preventive urea nozzle according to claim 1, it is characterised in that：Described urea mozzle
Upper end at right angles bends, and knee uses arc-shaped transition.
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| CN201710212974.XA CN106870073A (en) | 2017-04-01 | 2017-04-01 | A kind of efficient crystallization-preventive urea nozzle |
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| CN201710212974.XA CN106870073A (en) | 2017-04-01 | 2017-04-01 | A kind of efficient crystallization-preventive urea nozzle |
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| CN106870073A true CN106870073A (en) | 2017-06-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113565605A (en) * | 2021-09-24 | 2021-10-29 | 寿光市博达机械制造有限公司 | Urea nozzle capable of preventing crystallization and frost cracking |
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| US20150048175A1 (en) * | 2012-03-28 | 2015-02-19 | Fujisaki Electric Co., Ltd. | Liquid ejecting device and method of liquid ejection |
| CN204627712U (en) * | 2015-04-27 | 2015-09-09 | 十堰市倍力汽车管业有限公司 | A kind of novel heat-insulation urea nozzle device |
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| CN113565605A (en) * | 2021-09-24 | 2021-10-29 | 寿光市博达机械制造有限公司 | Urea nozzle capable of preventing crystallization and frost cracking |
| CN113565605B (en) * | 2021-09-24 | 2021-12-17 | 寿光市博达机械制造有限公司 | Urea nozzle capable of preventing crystallization and frost cracking |
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Application publication date: 20170620 |