CN104948272A - SCR (selective catalytic reduction) system and urea ejection nozzle thereof - Google Patents
SCR (selective catalytic reduction) system and urea ejection nozzle thereof Download PDFInfo
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- CN104948272A CN104948272A CN201510214598.9A CN201510214598A CN104948272A CN 104948272 A CN104948272 A CN 104948272A CN 201510214598 A CN201510214598 A CN 201510214598A CN 104948272 A CN104948272 A CN 104948272A
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- urea
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- ejection nozzle
- sprayer body
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Abstract
The invention discloses a urea ejection nozzle of an SCR (selective catalytic reduction) system. The urea ejection nozzle comprises an ejection nozzle body, an ejection nozzle core and an ejection nozzle cover, an ejection orifice and a gas hole are formed in the front end of the ejection nozzle body, the ejection nozzle cover cooperates with the rear end of the ejection nozzle body to fix the ejection nozzle core in the ejection nozzle body, and a urea passage of the ejection nozzle core is communicated with a urea inlet and the ejection orifice; a gas inlet is formed in the lateral side of the ejection nozzle body, and a first gas passage is formed in the lateral side, matched with the ejection nozzle body, of the ejection nozzle core and communicated with the gas inlet and the gas hole; a second gas passage is formed in the side, matched with the internal front end face of the ejection nozzle body, of the front end of the ejection nozzle core and communicated with the first gas passage and the ejection orifice. When the urea ejection nozzle works, a urea solution and part of gas are ejected from the ejection orifice at the same time, so that an atomizing effect for the urea solution is enhanced; the other part of the gas is ejected from the gas hole to form a gas barrier in front of the ejection nozzle body, so that crystallization on the ejection nozzle body is avoided, and the ejection nozzle body is prevented from being blocked. The invention further provides the SCR (selective catalytic reduction) system.
Description
Technical field
The present invention relates to engine exhaust emission technical field, particularly relate to a kind of SCR system and urea nozzle thereof.
Background technique
SCR technology (Selective Catalytic Reduction Technology selective catalytic reduction technology) is used for the vent gas treatment of diesel engine, and the oxynitrides of diesel engine emissions is catalysed and reduced into nitrogen and water.
Motor exhaust enters outlet pipe after booster turbine flows out, by the urea nozzle be arranged on outlet pipe, quantitative aqueous solution of urea is sprayed into outlet pipe simultaneously, urea droplets issues unboiled water solution and pyrolytic reaction in high-temp waste gas effect, reducing agent ammonia (NH3) required for generation, oxynitrides (NOx) is optionally reduced to nitrogen (N2) and water by described ammonia under the effect of catalyzer.
At present, the urea nozzle in SCR system comprises passage and spray orifice, and flow of urea is sprayed by spray orifice through passage, can form urea spraying around shower nozzle, and urea spraying is easy to crystallization on shower nozzle, blocks shower nozzle, affects the use of urea nozzle.
Therefore, how avoiding urea nozzle forms urea crystals, avoid blocking shower nozzle, is the technical problem that those skilled in the art are badly in need of solving.
Summary of the invention
The object of this invention is to provide a kind of urea nozzle of SCR system, this urea nozzle can be avoided producing urea crystals, avoids getting clogged.Another object of the present invention is to provide a kind of SCR system with above-mentioned urea nozzle.
In order to realize above-mentioned technical purpose, the invention provides a kind of urea nozzle of SCR system, comprise sprayer body, sprinkler core and nozzle cap, the front end of described sprayer body has spray orifice and pore, described nozzle cap coordinates with the rear end of described sprayer body, described sprinkler core is fixed in described sprayer body, the urea channel connection urea inlet of described sprinkler core and described spray orifice; The side of described sprayer body has gas access, and the side that described sprinkler core coordinates with described sprayer body has the first gas channel, and described first gas channel is communicated with described gas access and described pore; The fitting surface of the front end of described sprinkler core and the front-end face inside of described sprayer body has the second gas channel, and described second gas channel is communicated with described first gas channel and described spray orifice.
Preferably, described spray orifice is positioned at the middle part of the front-end face of described sprayer body, and multiple described pores are distributed on the perimembranous of the front-end face of described sprayer body.
Preferably, the fitting surface of the front end of described sprinkler core and the front-end face inside of described sprayer body is the conical surface.
Preferably, the outside of the flaring end of the described conical surface has the first ring-shaped air chamber, and multiple described gas cell distribution is on described first ring-shaped air chamber; Multiple described second gas channel is distributed on the described conical surface, is communicated with described first ring-shaped air chamber and described spray orifice.
Preferably, the rear portion of the side that described sprinkler core coordinates with described sprayer body has the second ring-shaped air chamber, and described gas access is positioned at the side of described second ring-shaped air chamber, and described first gas channel is communicated with described first ring-shaped air chamber and described second ring-shaped air chamber.
Preferably, multiple described first gas channel is distributed in the side of described sprinkler core.
Preferably, the quantity of described first gas channel and described second gas channel is four.
Preferably, described nozzle cap has through hole, and the rear end of described sprinkler core is through described through hole, and described urea inlet is positioned at the rear end of described sprinkler core.
Present invention also offers a kind of SCR system, comprise urea box, urea pump and urea nozzle, the urea solution pump in described urea box is given described urea nozzle by described urea pump, and described urea nozzle is the urea nozzle described in above-mentioned any one.
The invention provides a kind of urea nozzle of SCR system, comprise sprayer body, sprinkler core and nozzle cap, the front end of sprayer body has spray orifice and pore, and nozzle cap coordinates with the rear end of described sprayer body, sprinkler core is fixed in sprayer body, the urea channel connection urea inlet of sprinkler core and spray orifice; The side of sprayer body has gas access, and the side that sprinkler core coordinates with sprayer body has the first gas channel, and the first gas channel is communicated with gas access and pore; The fitting surface of the front end of sprinkler core and the front-end face inside of sprayer body has the second gas channel, and the second gas channel is communicated with the first gas channel and spray orifice.
During the work of this urea nozzle, urea liquid enters from urea inlet, urea passage through sprinkler core arrives spray orifice, spray from spray orifice, meanwhile, gas enters from gas access, and a branch enters spray orifice through the first gas channel and the second gas channel, spray together with urea liquid, urea liquid is further atomized; Another part enters pore through the first gas channel, directly sprays, on front side of sprayer body, form gas shield, avoids sprayer body forms crystallization, avoids sprayer body and gets clogged.
Concrete, spray orifice is positioned at the middle part of the front-end face of sprayer body, and multiple pore is distributed on the perimembranous of the front-end face of sprayer body.Gas from then on structure pore ejection, can the front side of sprayer body formed gas shield.
Present invention also offers a kind of SCR system, comprise above-mentioned urea nozzle, this urea nozzle has above-mentioned technique effect, therefore the SCR system with this urea nozzle also has corresponding technique effect.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of embodiment of urea nozzle provided by the present invention;
Fig. 2 is the worm's eye view of the urea nozzle shown in Fig. 1;
Fig. 3 is the structural representation of the sprinkler core of the urea nozzle shown in Fig. 1;
Fig. 4 is the worm's eye view of the sprinkler core shown in Fig. 3.
Wherein, the reference character in Fig. 1 to Fig. 4 and the corresponding relation between component names as follows:
Nozzle cap 1; Sprayer body 2; Gas access 3; Sprinkler core 4; Spray orifice 5; Pore 6; Urea inlet 7; First gas channel 8; Second gas channel 9.
Embodiment
Core of the present invention is to provide a kind of urea nozzle of SCR system, and this urea nozzle can be avoided producing urea crystals, avoids getting clogged.Another core of the present invention is to provide a kind of SCR system with above-mentioned urea nozzle.
In order to make those skilled in the art person understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Please refer to Fig. 1 to Fig. 4, Fig. 1 is the structural representation of a kind of embodiment of urea nozzle provided by the present invention, Fig. 2 is the worm's eye view of the urea nozzle shown in Fig. 1, and Fig. 3 is the structural representation of the sprinkler core of the urea nozzle shown in Fig. 1, and Fig. 4 is the worm's eye view of the sprinkler core shown in Fig. 3.
In a kind of concrete mode of execution, the invention provides a kind of urea nozzle of SCR system, comprise sprayer body 2, sprinkler core 4 and nozzle cap 1, the front end of sprayer body 2 has spray orifice 5 and pore 6, nozzle cap 1 coordinates with the rear end of sprayer body 2, sprinkler core 4 is fixed in sprayer body 2, the urea channel connection urea inlet 7 of sprinkler core 4 and spray orifice 5; The side of sprayer body 2 has gas access 3, and the side that sprinkler core 4 coordinates with sprayer body 2 has the first gas channel 8, first gas channel 8 and is communicated with gas access 3 and pore 6; The fitting surface of the front end of sprinkler core 4 and the front-end face inside of sprayer body 2 has the second gas channel 9, second gas channel 9 and is communicated with the first gas channel 8 and spray orifice 5.
SCR system comprises urea box, urea pump and urea nozzle, urea solution pump in urea box is given urea nozzle by urea pump, urea liquid enters urea nozzle from urea inlet 7, urea passage through sprinkler core 4 arrives spray orifice 5, spray from spray orifice 5, the urea liquid of ejection will form urea spraying on front side of sprayer body 2, and urea spraying hydrolysis reaction occurs and generates ammonia, and oxynitrides can be reduced to nitrogen and water by ammonia under the effect of catalyzer.
During the work of this urea nozzle, urea liquid enters from urea inlet 7, and the urea passage through sprinkler core 4 arrives spray orifice 5, sprays from spray orifice 5, simultaneously, gas enters from gas access 3, and from the gas that gas access 3 enters, branch's gas enters spray orifice 5 through the first gas channel 8 and the second gas channel 9, spray together with urea liquid, participate in the atomization of urea liquid, better atomizing effect can be obtained, make the diameter of droplet less; Another part gas enters pore 6 through the first gas channel 8, is directly sprayed by pore 6, on front side of sprayer body 2, form gas shield, urea can be avoided to be sprayed on sprayer body 2 and form crystallization, protection sprayer body 2.
Urea inlet 7 is positioned at the rear end of urea nozzle, can be positioned on nozzle cap 1, also can be positioned on sprinkler core 4.First gas channel 8 is positioned at the side that sprinkler core 4 coordinates with sprayer body 2, can be positioned on sprinkler core 4, also can be positioned on sprayer body 2.
Concrete, spray orifice 5 is positioned at the middle part of the front-end face of sprayer body 2, and multiple pores 6 are distributed on the perimembranous of the front-end face of sprayer body 2, as shown in Figure 2.
The spray orifice 5 of urea liquid in the middle part of sprayer body 2 front-end face sprays, and the urea spraying of formation centered by spray orifice 5, will be spread gradually; Gas sprays from multiple pores 6 of sprayer body 2 front-end face perimembranous, can form gas shield in the front side of sprayer body 2, and protection sprayer body 2 is avoided urea to spray and rested on front side of sprayer body 2, can not form crystallization on sprayer body 2.
Concrete, the fitting surface of the front end of sprinkler core 4 and the front-end face inside of sprayer body 2 can be the conical surface, arc surface or plane, and the preferred structure of fitting surface is the conical surface, and compared with plane, the conical surface more easily realizes face sealing, and compared with arc surface, the conical surface is more easily processed.The front end of sprinkler core 4 has the identical conical surface of tapering with the front-end face inside of sprayer body 2, and this conical surface is to the direction convergent of spray orifice 5.
In mode of execution concrete further, the outside of the flaring end of the conical surface has the first ring-shaped air chamber, and multiple pore 6 is distributed on the first ring-shaped air chamber; Multiple second gas channel 9 is distributed on the conical surface, is communicated with the first ring-shaped air chamber and spray orifice 5.
After gas enters from gas access 3, enter the first ring-shaped air chamber, from the first ring-shaped air chamber shunting, a part directly sprays from pore 6, and another part enters spray orifice 5 through the second gas channel 9, sprays from spray orifice 5 and urea liquid simultaneously.
Pore 6 is distributed on the first ring-shaped air chamber, and the pressure of the gas that the first ring-shaped air chamber can make each pore 6 spray is identical, and the pressure ratio of the gas shield of formation is more even.On the conical surface that the front end that second gas channel 9 is distributed in sprinkler core 4 coordinates with sprayer body 2, this second gas channel 9 can be positioned on sprinkler core 4, also can be positioned on sprayer body 2.
Multiple second gas channel 9 is distributed on the above-mentioned conical surface, gas can be made to mix with urea liquid uniformly from the surrounding of spray orifice 5, obtain better atomizing effect.
In another kind of concrete mode of execution, the rear portion of the side that sprinkler core 4 coordinates with sprayer body 2 has the second ring-shaped air chamber, and gas access 3 is positioned at the side of the second ring-shaped air chamber, and the first gas channel 8 is communicated with the first ring-shaped air chamber and the second ring-shaped air chamber.
Gas is introduced into the second ring-shaped air chamber from gas access 3, then enters the first ring-shaped air chamber through the first gas channel 8, in the first ring-shaped air chamber shunting.By two ring-shaped air chambers, the pressure of the gas that each pore 6 can be made to spray is identical, and the pressure that also can make to flow to the gas of spray orifice 5 from each second gas channel 9 is identical, make atomizing effect evenly.
Concrete, multiple first gas channels 8 are distributed in the side of sprinkler core 4.Each first gas channel 8 is distributed on the side of sprinkler core 4, after gas enters the second ring-shaped air chamber, the first ring-shaped air chamber can be entered uniformly by each first gas channel 8, the pressure uniform in the first ring-shaped air chamber is distributed, and then more uniform atomizing effect can be obtained.
In a kind of concrete mode of execution, as shown in Figure 3 and Figure 4, the quantity of the first gas channel 8 and the second gas channel 9 is four, is distributed on sprinkler core 4, and each second gas channel 9 is corresponding with each first gas channel 8 respectively.
In the respective embodiments described above, nozzle cap 1 has through hole, and the rear end of sprinkler core 4 is through through hole, and urea inlet 7 is positioned at the rear end of sprinkler core 4.Urea inlet 7 also can be positioned on nozzle cap 1, by urea channel connection urea inlet 7 and the spray orifice 5 of sprinkler core 4.
Except above-mentioned urea nozzle, present invention also offers a kind of SCR system, comprise urea box, urea pump and urea nozzle, the urea solution pump in urea box is given urea nozzle by urea pump, and described urea nozzle is the urea nozzle described in the various embodiments described above.
This urea nozzle has above-mentioned technique effect, therefore the SCR system with this urea nozzle also has corresponding technique effect, and other structures of this SCR system please refer to prior art, repeat no more herein.
Above SCR system provided by the present invention and urea nozzle thereof are described in detail.Apply specific case herein to set forth principle of the present invention and mode of execution, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (9)
1. the urea nozzle of a SCR system, it is characterized in that, comprise sprayer body (2), sprinkler core (4) and nozzle cap (1), the front end of described sprayer body (2) has spray orifice (5) and pore (6), described nozzle cap (1) coordinates with the rear end of described sprayer body (2), described sprinkler core (4) is fixed in described sprayer body (2), the urea channel connection urea inlet (7) of described sprinkler core (4) and described spray orifice (5); The side of described sprayer body (2) has gas access (3), the side that described sprinkler core (4) coordinates with described sprayer body (2) has the first gas channel (8), and described first gas channel (8) is communicated with described gas access (3) and described pore (6); The fitting surface of the front end of described sprinkler core (4) and the front-end face inside of described sprayer body (2) has the second gas channel (9), and described second gas channel (9) is communicated with described first gas channel (8) and described spray orifice (5).
2. the urea nozzle of SCR system as claimed in claim 1, it is characterized in that, described spray orifice (5) is positioned at the middle part of the front-end face of described sprayer body (2), and multiple described pores (6) are distributed on the perimembranous of the front-end face of described sprayer body (2).
3. the urea nozzle of SCR system as claimed in claim 2, it is characterized in that, the fitting surface of the front end of described sprinkler core (4) and the front-end face inside of described sprayer body (2) is the conical surface.
4. the urea nozzle of SCR system as claimed in claim 3, it is characterized in that, the outside of the flaring end of the described conical surface has the first ring-shaped air chamber, and multiple described pore (6) is distributed on described first ring-shaped air chamber; Multiple described second gas channel (9) is distributed on the described conical surface, is communicated with described first ring-shaped air chamber and described spray orifice (5).
5. the urea nozzle of SCR system as claimed in claim 4, it is characterized in that, described sprinkler core (4) has the second ring-shaped air chamber with the rear portion of the side that described sprayer body (2) coordinates, described gas access (3) is positioned at the side of described second ring-shaped air chamber, and described first gas channel (8) is communicated with described first ring-shaped air chamber and described second ring-shaped air chamber.
6. the urea nozzle of SCR system as claimed in claim 5, it is characterized in that, multiple described first gas channels (8) are distributed in the side of described sprinkler core (4).
7. the urea nozzle of SCR system as claimed in claim 6, is characterized in that, described first gas channel (8) is four with the quantity of described second gas channel (9).
8. the urea nozzle of the SCR system as described in any one of claim 1 to 7, it is characterized in that, described nozzle cap (1) has through hole, the rear end of described sprinkler core (4) is through described through hole, and described urea inlet (7) is positioned at the rear end of described sprinkler core (4).
9. a SCR system, comprises urea box, urea pump and urea nozzle, and the urea solution pump in described urea box is given described urea nozzle by described urea pump, it is characterized in that, described urea nozzle is the urea nozzle described in above-mentioned 1 to 8 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510214598.9A CN104948272A (en) | 2015-04-29 | 2015-04-29 | SCR (selective catalytic reduction) system and urea ejection nozzle thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510214598.9A CN104948272A (en) | 2015-04-29 | 2015-04-29 | SCR (selective catalytic reduction) system and urea ejection nozzle thereof |
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| CN104948272A true CN104948272A (en) | 2015-09-30 |
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| CN201510214598.9A Pending CN104948272A (en) | 2015-04-29 | 2015-04-29 | SCR (selective catalytic reduction) system and urea ejection nozzle thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320485A (en) * | 2000-01-26 | 2001-11-07 | 喷洒系统公司 | Air atomizing nozzle assembly with improved air cap |
| FR2827198A1 (en) * | 2001-07-10 | 2003-01-17 | Air Liquide | Atomiser nozzle for liquid atomised by a fluid has at least two channels for atomising fluid to divide its flow |
| JP2010502419A (en) * | 2006-09-04 | 2010-01-28 | アイティーダブリュ シュールファス エ フィニッション | Spray gun head, double atomization |
| CN102182533A (en) * | 2009-12-01 | 2011-09-14 | 通用汽车环球科技运作有限责任公司 | Air assisted injector, and injection system and exhaust treatment system incorporating the same |
| CN103272728A (en) * | 2013-06-09 | 2013-09-04 | 潍柴动力股份有限公司 | Silicon controlled rectifier (SCR) system and urea spray nozzle thereof |
| JP2014005744A (en) * | 2012-06-21 | 2014-01-16 | Yanmar Co Ltd | Urea water injection nozzle |
| CN103726911A (en) * | 2012-10-11 | 2014-04-16 | 曼柴油机和涡轮机欧洲股份公司 | Device for injecting a liquid into an exhaust gas flow and exhaust gas aftertreatment system |
-
2015
- 2015-04-29 CN CN201510214598.9A patent/CN104948272A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320485A (en) * | 2000-01-26 | 2001-11-07 | 喷洒系统公司 | Air atomizing nozzle assembly with improved air cap |
| FR2827198A1 (en) * | 2001-07-10 | 2003-01-17 | Air Liquide | Atomiser nozzle for liquid atomised by a fluid has at least two channels for atomising fluid to divide its flow |
| JP2010502419A (en) * | 2006-09-04 | 2010-01-28 | アイティーダブリュ シュールファス エ フィニッション | Spray gun head, double atomization |
| CN102182533A (en) * | 2009-12-01 | 2011-09-14 | 通用汽车环球科技运作有限责任公司 | Air assisted injector, and injection system and exhaust treatment system incorporating the same |
| JP2014005744A (en) * | 2012-06-21 | 2014-01-16 | Yanmar Co Ltd | Urea water injection nozzle |
| CN103726911A (en) * | 2012-10-11 | 2014-04-16 | 曼柴油机和涡轮机欧洲股份公司 | Device for injecting a liquid into an exhaust gas flow and exhaust gas aftertreatment system |
| CN103272728A (en) * | 2013-06-09 | 2013-09-04 | 潍柴动力股份有限公司 | Silicon controlled rectifier (SCR) system and urea spray nozzle thereof |
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Application publication date: 20150930 |
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