CN104747257B - Air-assisted nozzle, after-treatment system and its control method - Google Patents
Air-assisted nozzle, after-treatment system and its control method Download PDFInfo
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- CN104747257B CN104747257B CN201510163565.6A CN201510163565A CN104747257B CN 104747257 B CN104747257 B CN 104747257B CN 201510163565 A CN201510163565 A CN 201510163565A CN 104747257 B CN104747257 B CN 104747257B
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- urea
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Abstract
A kind of air-assisted nozzle, it includes the main part of mounting portion and the protrusion mounting portion, the main part is equipped with end, the urea passage through the end and is looped around the urea channels peripheral and is connected through the air duct of the end, the urea passage with exterior realize of the air duct in the nozzle；The nozzle further includes the heating element to be heated to the urea liquid in urea passage.The invention further relates to a kind of motor exhaust after-treatment system and its control method.The present invention heats urea liquid by increasing heating element, when there are during urea crystal, being eliminated crystal by heating in urea pipe；When urea crystal is not present in urea pipe, can prevent to form urea crystals under worst cold case.
Description
Technical field
Motor exhaust after-treatment system and the rear place the present invention relates to a kind of air-assisted nozzle, with the nozzle
The control method of reason system.
Background technology
It is long-standing to handle the technology of motor exhaust using the principle that ammonia is produced after hydrolysis of urea.It is in general, existing
Having in technology has non-air assist type and air-assisted two systems, and the system of wherein non-air assist type is to utilize power source
Pressurize to urea liquid, then urea liquid is atomised in exhaust pipe by nozzle again；The system of air-assisted is again
Two types are subdivided into, one kind is internal-mixing, and another kind is exterior mixing.Wherein, internal-mixing refers to be provided with system positioned at spray
Mixing chamber before mouth, urea liquid and compressed air mix and then by nozzle atomization into exhaust pipe in mixing chamber；
Exterior mixing refers to urea liquid and compressed air not in internal mix, and realizes mixing in the exterior of nozzle.
Research shows, under worst cold case, once the moisture in urea liquid is evaporated, urea crystal will separate out to be formed
Urea crystals, may block urea pipe, the surface of mixer, the surface of catalyst converter and nozzle etc., and eventually increase is started
The oil consumption of machine, reduce purification efficiency to harmful substance in tail gas.
Non-air assist type system and air-assisted system have respective advantage and disadvantage, how to solve asking for urea crystals
Mode is also different used by topic.
It is higher and higher to the processing requirement of motor exhaust with the continuous upgrading of discharge standard.With urea straying quatity
Increase, the risk of urea crystals also increasing, how to solve the problems, such as urea crystals have become hinder post-processing technology to
The problem of preceding development.
The content of the invention
It is an object of the invention to provide it is a kind of reduce the air-assisted nozzle of urea crystals risk, after-treatment system and
Its control method.
To achieve the above object, the present invention adopts the following technical scheme that：A kind of air-assisted nozzle, it includes mounting portion
And the main part of the protrusion mounting portion, the main part are equipped with end, the urea passage through the end and surround
In the urea channels peripheral and through the air duct of the end, the urea passage is with the air duct in the spray
The exterior of mouth realizes connection；The nozzle further includes the heating element to be heated to the urea liquid in urea passage.
As further improved technical scheme of the present invention, the heating element is arranged on the inner side of the urea passage.
As further improved technical scheme of the present invention, the main part includes adding positioned at the urea channels peripheral
The passage of heat, the heating element is in the heating passage.
As further improved technical scheme of the present invention, it is described heating passage in a ring, positioned at the urea passage with
Between the air duct；The heating element includes the heater strip or heating plate in the heating passage.
As further improved technical scheme of the present invention, the main part includes adding positioned at the urea channels peripheral
The passage of heat, the heating element are included to introduce the engine exhaust in the heating passage.
As further improved technical scheme of the present invention, the heating element includes heating the exhaust gas useless
Gas heating unit.
As further improved technical scheme of the present invention, the heating element is inductive heating element, it is wrapped in institute
State the periphery of main part.
As further improved technical scheme of the present invention, the nozzle, which further includes, to be wrapped in outside the inductive heating element
The protective case enclosed.
As further improved technical scheme of the present invention, the heating element is equipped with power connection.
As further improved technical scheme of the present invention, the nozzle includes the urea tube connected with the urea passage
Connector and the air pipe fitting connected with the air duct, the urea passage is for straight channel and positioned at the main part
Middle part, the air duct include the first passage of annular and the second channel of taper.
The invention further relates to a kind of motor exhaust after-treatment system, it includes with the urea passage being connected and to pump
Send the urea pump of urea liquid, the source of the gas being connected with the air duct, controller and upper on exhaust pipe to be installed to
State nozzle.
The invention further relates to a kind of control method of above-mentioned motor exhaust after-treatment system, it includes：
Under worst cold case, the air duct is closed, starts the heating element to the urea in the urea passage
Solution is heated, and is evaporated urea liquid and is decomposed into ammonia, and ammonia is ejected into exhaust pipe with larger pressure；
Under worst hot case, the heating element is closed, air duct is opened and imports compressed air, and realized by air
Urea liquid is preferably atomized.
As further improved technical scheme of the present invention, the worst cold case refers to delivery temperature less than 220 DEG C, described
Worst hot case refers to that delivery temperature is higher than 220 DEG C.
Compared to the prior art, present invention employs air-assisted nozzle, introduces air, improves the atomization effect of urea
Fruit；On this basis, urea liquid is heated by increasing heating element, when in urea pipe there are during urea crystal,
Crystal can be eliminated by heating；When urea crystal is not present in urea pipe, can prevent to form urine under worst cold case
Element crystallization.
Brief description of the drawings
Fig. 1 is the principle schematic of inventive engine exhaust gas aftertreatment system.
Fig. 2 is the diagrammatic cross-section of nozzle in the first embodiment in Fig. 1.
Fig. 3 is the diagrammatic cross-section of nozzle in this second embodiment in Fig. 1.
Fig. 4 is the diagrammatic cross-section of nozzle in the third embodiment in Fig. 1.
Fig. 5 is diagrammatic cross-section of the nozzle in the 4th embodiment in Fig. 1.
Fig. 6 is the schematic diagram with the matched exhaust gas heating pipeline of nozzle in Fig. 5.
Fig. 7 is diagrammatic cross-section of the nozzle in the 5th embodiment in Fig. 1.
Embodiment
It please join shown in Fig. 1, present invention is disclosed a kind of motor exhaust after-treatment system 100, it includes urea cylinder 1, uses
Outwards to pump urea pump 2, source of the gas 3, the controller of urea liquid from the urea cylinder 1（It is not shown）And to be installed to
Air-assisted nozzle 5 on exhaust pipe 7.The source of the gas 3 can be air pump or air bag.In the embodiment party that the present invention illustrates
In formula, the source of the gas 3 is air bag, and the motor exhaust after-treatment system 100 further includes the control valve being connected with the source of the gas 3
4.The urea pump 2 can be diaphragm pump, plunger pump, gear pump etc..The motor exhaust after-treatment system 100 of the present invention is one
The after-treatment system of kind air-assisted.
It please join shown in Fig. 2, the nozzle 5 includes mounting portion 51, the main part 52 of the protrusion mounting portion 51 and connection
If in the dry joint of the mounting portion 51.
In illustrative embodiments of the present invention, the mounting portion 51 is substantially in tabular, and the main part 52 is downwardly convex
Go out the mounting portion 51.The main part 52 is equipped with positioned at the end 520 of bottom, leads to downward through the urea of the end 520
Road 521 and it is looped around the periphery of the urea passage 521 and through the air duct 522 of the end 520.The nozzle 5 is
Exterior mixing, i.e., described urea passage 521 is connected with exterior realize of the air duct 522 in the nozzle 5, in the spray
The inside of mouth 5 is separated.
In illustrative embodiments of the present invention, the urea passage 521 is for straight channel and positioned at the main part 52
Middle part, the urea passage 521 form urea spray-hole 5211 at the position of the end 520.The air duct 522
The second channel 5222 of first passage 5221 and taper including annular, the second channel 5222 run through the end 520
Position at formed air jet hole 5223.In illustrative embodiments of the present invention, the air jet hole 5223 is in annulus
Shape and the periphery for being looped around the urea spray-hole 5211, to realize preferable mixing.
If the dry joint include the urea pipe fitting 53 that is connected with the urea passage 521 and with the air duct
The air pipe fitting 54 of 522 connections.
In the present invention, the nozzle 5 further includes the heating to be heated to the urea liquid in urea passage 521
Element 6.
It please join shown in Fig. 2, in the first embodiment that the present invention illustrates, the main part 52 includes being located at the urea
The heating passage 523 of the periphery of passage 521.The heating passage 523 in a ring, and is located at the urea passage 521 and the sky
Between gas passage 522.The heating element 6 is the heater strip being placed in the heating passage 523 or every can play
The other elements of heating function.
It please join shown in Fig. 3, in the second embodiment that the present invention illustrates, the main part 52 includes being located at the urea
The heating passage 523 of the periphery of passage 521.The heating passage 523 in a ring, and is located at the urea passage 521 and the sky
Between gas passage 522.The heating element 6 is to stick on the heating plate of heating passage 523 inner side or every can rise
To the other elements of heating function.
It please join shown in Fig. 4, in the 3rd embodiment that the present invention illustrates, the heating element 6 is set directly at described
The inner side of urea passage 521, to be heated to urea liquid.The heating element 6 can be heater strip or heating plate etc..
It please join shown in Fig. 5 and Fig. 6, in the 4th embodiment that the present invention illustrates, the main part 52 includes being located at institute
State the heating passage 523 of the periphery of urea passage 521.It is described heating passage 523 in a ring, and positioned at the urea passage 521 with
Between the air duct 522.The heating element 6 is included to introduce the engine exhaust in the heating passage 523, profit
The heating to urea liquid is realized with the heat of exhaust gas.The exhaust gas returns to after heat exchange is carried out with urea liquid from newly
In exhaust pipe 7（Join exhaust gas flow arrow）.Preferably, in order to improve exhaust gas temperature, the heating element 6 is further included to described useless
The waste gas heater 61 that gas is heated.Specifically, it please join shown in Fig. 6, one is drawn from a certain position of exhaust pipe 7 by exhaust gas
Road, adds the waste gas heater 61 and to aspirate the power set of exhaust gas in pipeline（It is not shown）, then will heating
Exhaust gas afterwards is incorporated into the heating passage 523, and then exhaust gas is recycled in exhaust pipe 7.
It please join shown in Fig. 7, the heating element 6 is inductive heating element（Such as load coil）, it is arranged on institute
The periphery of main part 52 is stated, directly the entirety of nozzle 5 is heated in heating process, makes urea liquid liter using the penetrability in magnetic field
Temperature.At this time, the main part 52 is without setting the heating passage 523 in similar first, second embodiment.It is described in order to protect
Heating element 6, the nozzle 5 further include the protective case 62 for being wrapped in the inductive heating element periphery.
It please join shown in Fig. 2 to Fig. 7, the heating element 6 is equipped with power connection 63, to be powered to it.
In addition, the invention further relates to a kind of control method of above-mentioned motor exhaust after-treatment system 100, it includes two kinds
Operating mode：
Under worst cold case, the air duct 522 is closed（Such as closing control valve 4, do not introduce compressed air）, start
The heating element 6 heats the urea liquid in the urea passage 521, is evaporated urea liquid and is decomposed into ammonia
Gas, and ammonia is ejected into exhaust pipe 7 with larger pressure.The worst cold case refer to such as engine start initial stage or
Person's idling mode, at this time delivery temperature be usually less than 220 DEG C.
Under worst hot case, the heating element 6 is closed, air duct 522 is opened and imports compressed air, and by air
Realization is preferably atomized urea liquid.Under worst hot case, delivery temperature is usually above 220 DEG C at this time.
It should be noted that：Under worst cold case, the risk of urea crystals is bigger, and starting heating element 6 can reduce
Crystallize risk.Under worst cold case, urea liquid is heated to form ammonia and the physicochemical change process with certain pressure, can
It is with summary：
First, urea liquid forms ammonia
Urea crystal is pyrolyzed：(NH2)2CO — NH3+HNCO
The fusing point of urea crystal is 132.5 DEG C, high temperature（Such as 350 DEG C ~ 650 DEG C）Under the conditions of, the fracture of urea CN keys is decomposed
For ammonia（NH3）.Research shows that, in 190 DEG C ~ 350 DEG C temperature ranges, partial thermal decomposition can also occur for urea, but product is more multiple
It is miscellaneous.
The pyrolytic process of urea liquid（Including hydrolysis）For：
(NH2)2CO — (NH2)2CO +H2O
(NH2)2CO — NH3+HNCO
HNCO+H2O — NH3+CO2
2nd, certain injection pressure is formed
According to equation of gaseous state：PV=nRT（Wherein：P：Gas pressure intensity；V：Gas volume；n：The amount of gaseous matter；T：Gas
Temperature；R：Gas constant）, it can be deduced that the proportional relation of pressure and temperature, with the rising of temperature, gas pressure can gradually increase
Greatly.Therefore, by being heated to urea liquid, temperature is improved, when urea liquid generates ammonia, gas can form larger
Pressure and eject.In the process, because it is ammonia rather than urea liquid to spray into exhaust pipe 7, therefore solves urine
The problem of element crystallization.
Compared to the prior art, the present invention is not only to add heating function just to solve crystallisation problems so simple,
And the superiority of the present invention should be considered from overall system architecture.First, the present invention is using outer mixed air-assisted post processing
System, can preferably realize that urea empties（purge）, so as to solve the problems, such as that urea freezes.In addition, by setting heating unit
Part 6, with reference to control strategy, when, there are during urea crystal, being eliminated crystal by heating in urea pipe（Because urea is brilliant
Body is pyrolyzed into ammonia and isocyanic acid at high temperature）；When urea crystal is not present in urea pipe, can prevent under worst cold case
Form urea crystals.
Above example is merely to illustrate the present invention and not limits technical solution described in the invention, to this specification
Understanding should based on person of ordinary skill in the field, although this specification with reference to the above embodiments to the present invention
Have been carried out being described in detail, still, it will be understood by those of ordinary skill in the art that, person of ordinary skill in the field is still
So can to technical scheme is modified or replaced equivalently of the present invention, and all do not depart from the spirit and scope of the present invention technical solution and
It is improved, and should all be covered in scope of the presently claimed invention.
Claims (6)
- A kind of 1. air-assisted nozzle, it is characterised in that：The nozzle includes the master of mounting portion and the protrusion mounting portion Body portion, the main part are equipped with end, the urea passage through the end and are looped around the urea channels peripheral and pass through The air duct of the end is worn, the urea passage is connected with exterior realize of the air duct in the nozzle；It is described Nozzle further includes the heating element to be heated to the urea liquid in urea passage, and the heating element connects equipped with power supply Head, the heating element are arranged on the inner side of the urea passage.
- A kind of 2. air-assisted nozzle, it is characterised in that：The nozzle includes the master of mounting portion and the protrusion mounting portion Body portion, the main part are equipped with end, the urea passage through the end and are looped around the urea channels peripheral and pass through The air duct of the end is worn, the urea passage is connected with exterior realize of the air duct in the nozzle；It is described Nozzle further includes the heating element to be heated to the urea liquid in urea passage, and the main part is included positioned at described The heating passage of urea channels peripheral, the heating element are included to introduce the engine exhaust in the heating passage.
- 3. air-assisted nozzle as claimed in claim 2, it is characterised in that：The heating element include to the exhaust gas into The waste gas heater of row heating.
- 4. air-assisted nozzle as claimed in claim 3, it is characterised in that：The heating element is equipped with power connection.
- 5. a kind of motor exhaust after-treatment system, it includes being connected with the urea passage and to pump the urine of urea liquid Element pump, the source of the gas being connected with the air duct, controller and to be installed to the nozzle on exhaust pipe, it is characterised in that： The nozzle is the nozzle described in any one in Claims 1-4 item.
- A kind of 6. control method of motor exhaust after-treatment system, it is characterised in that：The motor exhaust after-treatment system For the motor exhaust after-treatment system described in claim 5, the control method includes：When delivery temperature is less than 220 DEG C, the air duct is closed, starts the heating element in the urea passage Urea liquid is heated, and is evaporated urea liquid and is decomposed into ammonia, and ammonia is ejected into exhaust pipe with larger pressure In；When delivery temperature is higher than 220 DEG C, the heating element is closed, air duct is opened and imports compressed air, and by sky Gas is realized and urea liquid is preferably atomized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510163565.6A CN104747257B (en) | 2015-04-08 | 2015-04-08 | Air-assisted nozzle, after-treatment system and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510163565.6A CN104747257B (en) | 2015-04-08 | 2015-04-08 | Air-assisted nozzle, after-treatment system and its control method |
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| Publication Number | Publication Date |
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| CN104747257A CN104747257A (en) | 2015-07-01 |
| CN104747257B true CN104747257B (en) | 2018-05-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510163565.6A Active CN104747257B (en) | 2015-04-08 | 2015-04-08 | Air-assisted nozzle, after-treatment system and its control method |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110433562A (en) * | 2019-09-04 | 2019-11-12 | 合肥威尔燃油系统股份有限公司 | A kind of urea filter with cooling water heating |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101737133A (en) * | 2010-01-22 | 2010-06-16 | 中国汽车技术研究中心 | Device and method for spraying aqueous solution of urea having functions of cooling and anti-clogging |
| CN103899392A (en) * | 2014-04-29 | 2014-07-02 | 中国重汽集团济南动力有限公司 | Air-assisted urea supply device used for diesel engine |
| CN104047689A (en) * | 2014-07-15 | 2014-09-17 | 中国重汽集团济南动力有限公司 | Post-processing system with urea hydrolysis function |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6895747B2 (en) * | 2002-11-21 | 2005-05-24 | Ford Global Technologies, Llc | Diesel aftertreatment systems |
| JP5010662B2 (en) * | 2009-10-08 | 2012-08-29 | ヤンマー株式会社 | Exhaust purification device |
| JP2016098709A (en) * | 2014-11-20 | 2016-05-30 | いすゞ自動車株式会社 | Cooling system of urea water injection nozzle of internal combustion engine, internal combustion engine, and cooling method of urea water injection nozzle of internal combustion engine |
| CN204591420U (en) * | 2015-04-08 | 2015-08-26 | 天纳克（苏州）排放系统有限公司 | Air-assisted nozzle and after-treatment system thereof |
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2015
- 2015-04-08 CN CN201510163565.6A patent/CN104747257B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101737133A (en) * | 2010-01-22 | 2010-06-16 | 中国汽车技术研究中心 | Device and method for spraying aqueous solution of urea having functions of cooling and anti-clogging |
| CN103899392A (en) * | 2014-04-29 | 2014-07-02 | 中国重汽集团济南动力有限公司 | Air-assisted urea supply device used for diesel engine |
| CN104047689A (en) * | 2014-07-15 | 2014-09-17 | 中国重汽集团济南动力有限公司 | Post-processing system with urea hydrolysis function |
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| CN104747257A (en) | 2015-07-01 |
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