CN105240095A - SCR system self-oscillation pulse atomization nozzle applied to marine diesel engine - Google Patents
SCR system self-oscillation pulse atomization nozzle applied to marine diesel engine Download PDFInfo
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- CN105240095A CN105240095A CN201510800811.4A CN201510800811A CN105240095A CN 105240095 A CN105240095 A CN 105240095A CN 201510800811 A CN201510800811 A CN 201510800811A CN 105240095 A CN105240095 A CN 105240095A
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Abstract
The invention discloses an SCR system self-oscillation pulse atomization nozzle applied to a marine diesel engine. The SCR system self-oscillation pulse atomization nozzle comprises a gas-liquid injection head and a self-oscillation pulse head arranged on an injection opening at the front end of the gas-liquid injection head in a connected manner; the gas-liqid injection head comprises an injection core provided with a reductant pipeline and an injection shell sleeving the outer part of the injection core; wherein a gap exists between the outer wall of the injection core and the inner wall of the injection shell, and the gap is an annular gap around the outer wall of the injection core and serves as a gas pipeline; the output end part of the reductant pipeline is provided with a plurality of small injection holes, and the small injection holes are distributed in an annular mode, so that by adopting the structure, the gas-liquid mixing effect of gas travel and reductant travel cutting is obvious; a gap cavity is formed between the self-oscillation pulse head and the gas-liquid injection head through assembly, so that the gas and liquid can be mixed fully; and the gap cavity is communicated with a self-oscillation mixing cavity of the self-oscillation pulse head, so that mixed liquid drops in the gas is subjected to empty cutting through communication of the two cavities, and finally highly-mixed gas-liquid mixed gas which is injected in a pulsating manner is formed.
Description
Technical field
The present invention relates to a kind of atomizer nozzle, particularly a kind of being reached by self oscillations pulsing jet strengthens atomizing effect nozzle.
Background technique
SCR system is the post-treatment measure that research is the most extensive, minimizing NOx effect is best both at home and abroad, the basic functional principle of the method is: tail gas enters outlet pipe from exhaust gas turbine outlet, appropriate aqueous solution of urea is injected in outlet pipe with mist by the urea measuring and injecting device be arranged on outlet pipe, aqueous solution of urea issues unboiled water solution and pyrolytic reaction in high-temperature exhaust air effect, the reducing agent ammonia (NH required for generation
3), at SCR system catalyst surface, NOx is reduced into nitrogen (N after ammonia mixes with exhaust
2).
Experiment finds, the quality of SCR system performance, depends on the effect that aqueous solution of urea is atomized to a great extent, the mentality of designing of the structure of SCR nozzle came from the needle jet structure of industrially extensive use in the past, this nozzle arrangements is simple, cheap for manufacturing cost, is easy to design and maintenance.But this nozzle is generally applied to without air assist system, nozzle is often in the exhaust of higher temperature, needs to provide cooling to nozzle extraly, the more important thing is the meeting crystallization after moisture evaporation of the residue after reducing agent stop-spraying, easily causes the blocking of nozzle.Air mixing systems is had effectively to address this problem, spray from nozzle under High Pressure after reducing agent mixes with air, pressure size is determined by nozzle diameter and air mass flow, and directly affecting the outlet velocity of mixture, the droplet size that therefore also opposing jet is decomposed to form has a direct impact.
On market, application has designed shaping with the SCR system nozzle of vehicle exhaust and has come into operation, and this nozzle arrangements is easy, is placed in the mid-rear portion in automobile exhaust hole.Nozzle problems faced peculiar to vessel is that spray amount exceeds several order of magnitude than automobile, exhaust duct of diesel engine bore is also the decades of times of automobile exhaust pipeline and even hundreds of times, this proposes acid test to the project organization of nozzle and atomizing effect, and then continues to use traditional needle valve type structure and cannot meet the demands.
Summary of the invention
The present invention is directed to above-mentioned technical problem, propose a kind of being reached by self oscillations pulsing jet and strengthen atomizing effect nozzle.
For reaching above object, be achieved through the following technical solutions:
One is applied to marine diesel engine SCR system self-excited oscillation pulse atomizer nozzle, comprising: gas-liquid injection head and the self-excited pulse head being assemblied in gas-liquid injection head front end jetburner and being connected;
Gas-liquid injection head comprises: the injection core being processed with reducing agent pipeline and the injection shell overlapped as spraying core outside;
Wherein, spray outer core and spray between outer casing inner wall and have gap, this gap is the annular space around spraying outer core, and this gap is as gas piping, and then reducing agent pipeline and gas piping form concentric ring structure;
Reducing agent pipeline output end is processed with some little spray-holes, and little spray-hole becomes circular distribution;
Gas piping is step structure, diminished gradually, and gas piping diminishes gradually near the part ring cavity diameter of reducing agent pipeline output terminal (diameter namely the closer to the ring cavity of reducing agent pipeline output terminal gas piping is less) to output terminal aperture (namely spray outer core and spray housing slot) by input end;
Self-excited pulse head comprises: the mixed gas inlet docked with gas-liquid injection head output terminal, impulse jet mouth and the self oscillations mixing chamber being arranged at self-excited pulse centriciput; Wherein, mixed gas inlet and impulse jet mouth are communicated with output terminal with self oscillations mixing chamber input end respectively;
Self oscillations mixing chamber is positioned at impulse jet mouth end inwall and is provided with the taper projection extended to self oscillations mixing chamber center, and the processing of impulse jet mouth is communicated with self oscillations mixing chamber in taper protrusion center line;
Wherein, also exist in the cavity of self oscillations mixing chamber to expand and entrainment and wait complicated flow process, make under the flowing of jet is subject to anisopleural disturbance in cavity, wall attachment effect occurs and is partial to the flowing of cavity side and is also finally attached on wall; The asymmetrical disturbance circumferentially distributed orders about the region that jet hits wall and does not fix, mobile along cavity wall circumference, cause jet do in chamber precessional motion also " bounce-back " spray cavity;
Further, the design of mixing chamber be intended to utilize when jet by mixed gas inlet with the mode realizing sudden expansion spray into structure meet in the cavity of certain geometric condition time, encourage without the need to external force, jet will continuously this characteristic of valid periodic swinging, the form that this high atomisation and periodic swinging spray, can promote to eject gas in mixed gas and exhaust duct of diesel engine greatly efficient, mix fully.
Further, self oscillations mixing chamber is solid of rotation, mixed gas inlet, self oscillations mixing chamber and impulse jet mouth central coaxial, and this structure forms the continuous self-oscillation flow jet flow of high frequency for ensureing;
Further, be provided with an one-level mixing chamber reduced gradually to self-excited pulse head input end diameter by gas-liquid injection head output terminal between gas-liquid injection head output terminal and self-excited pulse head input end, increase a mixing chamber;
Further, gas-liquid injection head and self-excited pulse head are for be detachably fixedly connected with, and this structure is mainly just changed and keeped in repair; And this structural union selects Screw assembly usually, sealing other modes that removably connect good also can be selected.
Adopt the present invention of technique scheme, gas-liquid injection head and self-excited pulse head, this hybrid mode is designed to external rings around gas and vapor permeation mode, gas is by spraying core and spraying annulus (abbreviation gas piping) input formed between shell, gas piping is step structure, diminished gradually to output terminal aperture by input end, be intended to air velocity is accelerated, reducing agent pipeline and air pipe line form concentric ring structure, and it is less the closer to the diameter of the ring cavity of reducing agent pipeline output terminal gas piping, acceleration limit, such formation limit is shunk, in reducing agent pipeline, liquid was pulverized by the some little spray-hole first time first distributed ringwise by reducing agent pipeline output end simultaneously, the liquid-to-air pipeline high-speed annular gas out that first time pulverizes directly contacts, realize secondary cut, separating twice, and synchronized mixes, mixed gas abundant mixing in one-level mixing chamber realizes first order atomization, reduction of speed, then third time cutting is realized through mixed gas inlet, finally enter in self oscillations mixing chamber and carry out mixing and second time atomization again, and export in the chamber structure of this uniqueness specifically, formed the continuous self-oscillation flow jet flow of high frequency by the reducing agent drop that three times are pulverized, sprayed by impulse jet mouth, the flue gas of discharging with diesel engine fully mixes, again after static mixer mixes further, enter SCR catalyst control box.
To sum up, the present invention has following advantage:
1, by the design of unique self oscillations mixing chamber, solid jet can feed back in the chamber, superposition and amplification, forms strong self-excited oscillation pulsed water jet; This jet exacerbates the unstability in boundary layer, makes the easier unstability of the coherent structure of large scale, and then more easily entrainments surrounding fluid.These coherent structures in the movement process of downstream, produce and are out of shape, merge, break, be broken into microvortex structure step by step, form precipitous velocity gradient or concentration gradient, the mixing of acceleration molecular aspect.
2, urea liquid is mixed with air when entering nozzle chamber, both are fully vibrated in nozzle, obtains the self-excited oscillation pulsed water jet of high pressure urea; Self-excited oscillation pulsed water jet can improve the jet pressure of liquid jet significantly, and under identical system pressure, atomizing effect can be improved preferably, and atomized particle size obviously reduces.
3, the control mode of turbulent jet is divided into ACTIVE CONTROL and Passive Control, and this device well make use of the principle of Passive Control, does not apply additional machinery excitation, just can produce larger transformation characteristic, constantly valid periodic swinging, energy saving, reduces environmental pollution.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to technological means of the present invention can be better understood, and can be implemented according to the content of specification, and can become apparent to allow above and other object of the present invention, feature and advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Accompanying drawing explanation
The present invention is totally 4 width accompanying drawings, wherein:
Fig. 1 is gas-liquid injection head of the present invention and self-excited pulse head gapless docking structure schematic diagram.
Fig. 2 is main TV structure schematic diagram of the present invention.
Fig. 3 is self oscillations mixing chamber of the present invention partial enlarged drawing.
Fig. 4 is structure schematic diagram when arranging one-level mixing chamber between gas-liquid injection head of the present invention and self-excited pulse head.
In figure: 1, gas-liquid injection head, 1.1, spray core, 1.2, spray shell, 2, self-excited pulse head, 2.1, mixed gas inlet, 2.2, self oscillations mixing chamber, 2.3, impulse jet mouth, A, reducing agent pipeline, B, gas piping, C, one-level mixing chamber.
Embodiment
One is as shown in Figure 1, Figure 2, Figure 3 and Figure 4 applied to marine diesel engine SCR system self-excited oscillation pulse atomizer nozzle, comprising: gas-liquid injection head and the self-excited pulse head 2 being assemblied in gas-liquid injection head 1 front end jetburner and being connected;
Gas-liquid injection head 1 comprises: the injection core 1.1 being processed with reducing agent pipeline A and the injection shell 1.2 overlapped as spraying core 1.1 outside;
Wherein, spray between core 1.1 outer wall and injection shell 1.2 inwall and have gap, this gap is the annular space around spraying core 1.1 outer wall, and this gap is as gas piping B, and then reducing agent pipeline A and gas piping B forms concentric ring structure;
Reducing agent pipeline A output end is processed with some little spray-holes, and little spray-hole becomes circular distribution;
Gas piping B is step structure, diminished gradually, and gas piping B diminishes gradually near the part ring cavity diameter of reducing agent pipeline A output terminal (diameter namely the closer to the ring cavity of reducing agent pipeline A output terminal gas piping B is less) to output terminal aperture (namely spray outer core and spray housing slot) by input end;
Self-excited pulse head 2 comprises: the mixed gas inlet 2.1 docked with gas-liquid injection head 1 output terminal, impulse jet mouth 2.3 and the self oscillations mixing chamber 2.2 be arranged in the middle part of self-excited pulse head 2; Wherein, mixed gas inlet 2.1 and impulse jet mouth 2.3 are communicated with output terminal with self oscillations mixing chamber 2.2 input end respectively;
Self oscillations mixing chamber 2.2 is positioned at impulse jet mouth 2.3 end inwall, and to be provided with the taper extended to self oscillations mixing chamber 2.2 center protruding, and impulse jet mouth 2.3 is processed and is communicated with self oscillations mixing chamber 2.2 in taper protrusion center line;
Further, self oscillations mixing chamber 2.2 is solid of rotation, mixed gas inlet 2.1, self oscillations mixing chamber 2.2 and impulse jet mouth 2.3 central coaxial, and this structure forms the continuous self-oscillation flow jet flow of high frequency for ensureing;
Further, an one-level mixing chamber C reduced gradually to self-excited pulse head 2 input end diameter by gas-liquid injection head 1 output terminal is provided with between gas-liquid injection head 1 output terminal and self-excited pulse head 2 input end, increase a mixing chamber, improve mixed effect further;
Further, gas-liquid injection head 1 and self-excited pulse head 2 are for be detachably fixedly connected with, and this structure is mainly just changed and keeped in repair; And this structural union selects Screw assembly usually, sealing other modes that removably connect good also can be selected.
Adopt the present invention of technique scheme, gas-liquid injection head 1 and self-excited pulse head 2, this hybrid mode is designed to external rings around gas and vapor permeation mode, gas is by spraying core 1.1 and spraying annulus (the being called for short gas piping B) input formed between shell 1.2, gas piping B is step structure, diminished gradually to output terminal aperture by input end, be intended to air velocity is accelerated, reducing agent pipeline A and air pipe line B forms concentric ring structure, and it is less the closer to the diameter of the ring cavity of reducing agent pipeline A output terminal gas piping B, acceleration limit, such formation limit is shunk, in reducing agent pipeline A, liquid was pulverized by the some little spray-hole first time first distributed ringwise by reducing agent pipeline A output end simultaneously, first time pulverize liquid-to-air pipeline B out tell that annular gas directly contacts, realize secondary cut, separating twice, and synchronized mixes, mixed gas abundant mixing in one-level mixing chamber C realizes first order atomization, reduction of speed, then third time cutting is realized through mixed gas inlet 2.1, finally enter in self oscillations mixing chamber 2.2 and carry out mixing and second time atomization again, and export in the chamber structure of this uniqueness specifically, formed the continuous self-oscillation flow jet flow of high frequency by the reducing agent drop that three times are pulverized, sprayed by impulse jet mouth 2.3, the flue gas of discharging with diesel engine fully mixes, again after static mixer mixes further, enter SCR catalyst control box.
Wherein, as shown in Figure 3, indication in figure, L1 mixed gas inlet length, D2 is impulse jet mouth diameter, and D is self oscillations mixing chamber diameter, and L is self oscillations mixing chamber length, and L2 is taper projection length, and a is the protruding cone angle of taper;
In a preferred embodiment, the optimum proportioning district of L/D appears at 0.3 ~ 0.4, therefore can make further adjustment to jet size, preferable range 0.25 ~ 0.45;
In a preferred embodiment, be the best according to 120 °, the α angle that reference can be looked into, consider overall dimensions, this patent given range 113 ° ~ 130 °.
Wherein, one-level mixing chamber C is alternative setting, as shown in Figure 1 and Figure 4.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art are not departing within the scope of technical solution of the present invention, when the technology contents that appeal can be utilized to disclose is made a little change or is modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (5)
1. be applied to a marine diesel engine SCR system self-excited oscillation pulse atomizer nozzle, it is characterized in that: comprise, gas-liquid injection head and the self-excited pulse head (2) being assemblied in gas-liquid injection head (1) front end jetburner and being connected;
Described gas-liquid injection head (1) comprising: be processed with the injection core (1.1) of reducing agent pipeline (A) and overlap as spraying the outside injection shell (1.2) of core (1.1);
Wherein, spray core (1.1) outer wall and spray between shell (1.2) inwall and have gap, this gap is the annular space around spraying core (1.1) outer wall, and this gap is as gas piping (B), and then reducing agent pipeline (A) forms concentric ring structure with gas piping (B);
Described reducing agent pipeline (A) output end is processed with some little spray-holes, and little spray-hole becomes circular distribution;
Described gas piping (B) is step structure, is diminished gradually to output terminal aperture by input end, and gas piping (B) diminishes gradually near the part ring cavity diameter of reducing agent pipeline (A) output terminal;
Described self-excited pulse head (2) comprising: the mixed gas inlet (2.1) docked with gas-liquid injection head (1) output terminal, impulse jet mouth (2.3) and the self oscillations mixing chamber (2.2) be arranged in the middle part of self-excited pulse head (2); Wherein, mixed gas inlet (2.1) is communicated with output terminal with self oscillations mixing chamber (2.2) input end respectively with impulse jet mouth (2.3);
Described self oscillations mixing chamber (2.2) is positioned at impulse jet mouth (2.3) end inwall and is provided with the taper projection extended to self oscillations mixing chamber (2.2) center, and impulse jet mouth (2.3) processing is communicated with self oscillations mixing chamber (2.2) in taper protrusion center line.
2. one according to claim 1 is applied to marine diesel engine SCR system self-excited oscillation pulse atomizer nozzle, it is characterized in that: described self oscillations mixing chamber (2.2) is solid of rotation.
3. one according to claim 1 is applied to marine diesel engine SCR system self-excited oscillation pulse atomizer nozzle, it is characterized in that: described mixed gas inlet (2.1), self oscillations mixing chamber (2.2) and impulse jet mouth (2.3) central coaxial.
4. one according to claim 1 is applied to marine diesel engine SCR system self-excited oscillation pulse atomizer nozzle, it is characterized in that: be provided with an one-level mixing chamber (C) reduced gradually to self-excited pulse head (2) input end diameter by gas-liquid injection head (1) output terminal between gas-liquid injection head (1) output terminal and self-excited pulse head (2) input end.
5. one according to claim 1 is applied to marine diesel engine SCR system self-excited oscillation pulse atomizer nozzle, it is characterized in that: gas-liquid injection head (1) and self-excited pulse head (2) are for be detachably fixedly connected with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510800811.4A CN105240095A (en) | 2015-11-19 | 2015-11-19 | SCR system self-oscillation pulse atomization nozzle applied to marine diesel engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510800811.4A CN105240095A (en) | 2015-11-19 | 2015-11-19 | SCR system self-oscillation pulse atomization nozzle applied to marine diesel engine |
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Cited By (3)
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| CN107876235A (en) * | 2017-12-28 | 2018-04-06 | 绍兴飞马航空科技有限公司 | A kind of plant protection unmanned plane non-drip nozzle |
| CN112827687A (en) * | 2020-12-30 | 2021-05-25 | 浙江工业大学 | Spiral pipeline oscillation atomizer based on bionic surface |
| CN113280366A (en) * | 2021-05-13 | 2021-08-20 | 中国航空发动机研究院 | Afterburner structure based on self-excitation sweep oscillation fuel nozzle |
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Application publication date: 20160113 |