CN102116186A - Gas-liquid stirring and mixing device of urea solution metering injection system - Google Patents
Gas-liquid stirring and mixing device of urea solution metering injection system Download PDFInfo
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- CN102116186A CN102116186A CN2010102322938A CN201010232293A CN102116186A CN 102116186 A CN102116186 A CN 102116186A CN 2010102322938 A CN2010102322938 A CN 2010102322938A CN 201010232293 A CN201010232293 A CN 201010232293A CN 102116186 A CN102116186 A CN 102116186A
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Abstract
The invention relates to a gas-liquid stirring and mixing device of a urea solution metering injection system, comprising a metering valve, a compressed air inlet, a mixing cavity and an injection outlet, wherein the metering valve injects a reducing agent; the mixing cavity is used for gas-liquid stirring and mixing; the compressed air inlet is arranged on the side wall of the mixing cavity and tangent to the inner wall of the mixing cavity; and the injection outlet is arranged at the bottom of the mixing cavity. The invention has ingenious design, ensures good uniformity of a stirred and mixed suspension and can effectively solve the problems of deposition and crystallization inside the mixing cavity.
Description
Technical field
The present invention relates to a kind of exhaust gas from diesel vehicle post-processing purifying system, relate in particular to the gas-liquid mixing stirring device in a kind of urea solution metering injection system.
Background technique
Along with improving constantly of vehicular emission standard, the vehicle tai-gas clean-up system is the day by day extremely concern of vehicle manufacturers also, and various technology paths are also ripe gradually.
Existing known, by selective catalytic reduction technology (SCR) is to reduce a kind of main mode of diesel-oil vehicle NOx discharging, be about to reducing agent (aqueous solution of urea) through atomizing quantitative injection intake and exhaust pipeline, pass through a series of physical-chemical reactions again, main harmful gas NOx in the waste gas is changed into the nitrogen G﹠W discharge, reach the purpose of tail gas clean-up.Wherein, the broken and atomizing of the conveying of aqueous solution of urea, drop is to the NH of SCR carrier inlet
3CONCENTRATION DISTRIBUTION has a significant impact, and is the key factor that influences SCR system catalytic reaction efficient.
In the prior art, it (is metering valve process primary atomization in the metered injection process that the secondary-atomizing technology is mainly adopted in the atomizing of aqueous solution of urea, when spraying in the waste gas exhaust pipe, nozzle carries out atomized spray once more), its main feature is to utilize the pressurized air mixing urea aqueous solution, and the air-flow of the fair speed that relies on pressurized air to expand to form carrying liquid secretly and arrives the ejection of nozzle place with the form of suspension, makes the atomization of liquid.Be subjected to the influence of mixing chamber structure, air pressure, blowing direction and factors such as urea-spray amount and temperature, actual effect is still not ideal enough, and suspension is even inadequately, and easily occurs the depositing crystalline phenomenon in mixing chamber, causes injection line to stop up when serious.
In addition, because compressed-air actuated unexpected interruption does not have residual liquid in the scavenging pipeline, liquid return also may cause the crystallization blocking problem in the pipeline, influences the ejecting system proper functioning in real work.
Summary of the invention
The objective of the invention is to have overcome above-mentioned shortcoming of the prior art, gas-liquid in a kind of urea solution metering injection system mixing stirring device is provided, that the present invention designs is ingenious, mix the rear suspension liquid good uniformity, and can effectively solve depositing crystalline problem in the mixing chamber.
For achieving the above object, the invention provides the gas-liquid mixing stirring device in a kind of urea solution metering injection system, the metering valve, the compressed air inlet that comprise the injection reduction agent, be used for mixing chamber and jet exit that gas-liquid mixes, described compressed air inlet is arranged on the mixing chamber sidewall, and tangent with described mixing chamber inwall, described jet exit is arranged on described mixing chamber bottom, and described metering valve is the special-purpose metering valve of urea liquid of the prior art.
Preferably, described compressed-air actuated Way in is axially vertical with mixing chamber.According to the cyclone separator principle, in the time of in tangential gas flow enters mixing chamber, rotational gas flow and interior rotational gas flow outside can in the chamber, forming, outer rotational gas flow attaches chamber wall rotation, form interior rotational gas flow when reaching top, chamber, and with outer rotational gas flow reversing motion, arrive jet exit and flow out; Simultaneously, the urea liquid that metering valve ejects is taken out of after being mixed by interior rotational gas flow, because stirring action can form aqueous solution of urea uniform suspension and send to the jet exit place, reduces the crystallization risk, and helps forming uniform spraying at the nozzle place.
Preferably, described mixing chamber bottom is a funnel-shaped structure, and described jet exit is arranged on the bottom of " funnel " portion.
More preferably, described compressed air inlet is arranged on the upside of described " funnel " portion, and like this, even the pressurized air accidental interruption, aqueous solution of urea also can rely on action of gravity to discharge; Simultaneously, if the outlet pipe position is higher in actual applications, at this moment injection pipe is to rise to the nozzle place, and pressurized air interrupts purging the liquid in the injection pipe, under action of gravity, liquid in the injection pipe can be back in the mixing chamber, " funnel " portion can the storage area aqueous solution of urea, prevents that liquid from stopping up compressed air inlet and metering valve spray-hole, simultaneously because " funnel " portion and air surface of contact are little, even the storage area aqueous solution of urea can crystallization yet.
Preferably, described metering valve is arranged on the upside of described mixing chamber, and the metering valve spout extends to the inside of described mixing chamber, and described mixing chamber and metering valve are tightly connected by seal ring, simple in structure, good manufacturability, level of integration height.
More preferably, described air flow inlet is connect an air pressure regulator, solenoid valve and source of compressed air of pipeline successively, described source of compressed air is used to carry air pressure, and described solenoid valve is used to control the break-make of source of the gas, and described air pressure regulator is used to regulate the pressure that stirs air-flow.
The present invention has following beneficial effect: mixing chamber and metering valve height are integrated, design ingeniously, and stirring and mixing effect is good, can avoid depositing crystalline to stop up phenomenon such as air flow inlet and take place, and can effectively solve the crystallisation problems that injection pipe refluxes and causes.
Description of drawings:
Fig. 1 is to use cleaning system control principle figure of the present invention
Fig. 2 is the gas-liquid mixing stirring device air flow direction schematic representation in the urea solution metering injection system of the present invention
The compressed air inlet tangentially is provided with schematic representation among Fig. 3 the present invention
Embodiment:
In order more to be expressly understood technology contents of the present invention, describe in detail especially exemplified by following examples.
As Fig. 1, shown in Figure 2, use cleaning system of the present invention mainly to comprise liquid tank 1, pumping element 2, filter voltage stabilizer 4, metering valve 5 and mixing chamber 6, described liquid tank 1, pumping element 2, filter voltage stabilizer 4, metering valve 5 is connected with mixing chamber 6 series pipe successively, there is reducing agent (aqueous solution of urea) in the liquid tank, pumping element 2 is pumped into reducing agent in the metering valve 5 by pipeline, 4 pairs of reducing agents of filter play the filtration pressure stabilization function, 5 pairs of reducing agents of metering valve carry out metered injection, 6 pairs of reducing agents that eject of mixing chamber compressed air mix, and be blown into nozzle place (not shown) with the form of suspension, and spray in the outlet pipe, carry out selective catalytic reduction reaction.
Described pumping element 2 is diaphragm pump or an electromagnetic pump common in the prior art.
As shown in Figure 2, gas-liquid mixing stirring device in the urea solution metering injection system of the present invention comprises metering valve 5 and mixing chamber 6, described mixing chamber 6 tops are cylindrical-shaped structure, its underpart forms funnel-shaped structure " funnel " portion 17, described metering valve 5 is arranged on the upside of described mixing chamber 6, metering valve spray-hole 16 extends to described mixing chamber 6 inside, and and mixing chamber 6 be tightly connected by seal ring 11, described compressed air inlet 12 is arranged on the mixing chamber sidewall 3, its Way in axially vertical with mixing chamber (being that compressed air inlet 12 is tangent with mixing chamber 6 inwall place circumference) can be known from experience its set-up mode from Fig. 3; In the time of in tangential gas flow enters mixing chamber 6, rotational gas flow and interior rotational gas flow outside can in the chamber, forming, because jet exit 10 is arranged on " funnel " portion 17 of described mixing chamber 6 bottoms, outer rotational gas flow can attach chamber wall rotation, and towards blowing away from the direction of jet exit 10, when reaching mixing chamber top, can form interior rotational gas flow again, and with export-oriented air-flow reversing motion, spray to the nozzle place.
Described compressed air inlet 12 is connect an air pressure regulator 13, solenoid valve 18 and source of compressed air 14 of pipeline successively, described source of compressed air is used to carry air, described solenoid valve is used to control the break-make of source of the gas, and described air pressure regulator is used to regulate the pressure that stirs air-flow.
Use cleaning system of the present invention also to comprise a measurement control unit 15, described measurement control unit 15 is electrically connected with described pumping element 2, described metering valve 5, described solenoid valve 18, described air pressure regulator 13, forms circuit control system.
Gas-liquid mixed injection apparatus control principle is as follows in the exhaust gas aftertreatment system of the present invention:
The circuit pack solid line is represented pipeline among Fig. 1, the dotted line indication circuit.
As Fig. 1, Fig. 2 and shown in Figure 3, pumping element 2 is started working after measurement control unit 15 receives the pumping instruction, reducing agent in the liquid tank 1 is pumped in the metering valve 5 through filtering voltage stabilizer 4, when pressure reaches predetermined value, measurement control unit 15 receives injection signal, the beginning metered injection, simultaneously, measurement control unit 15 is opened solenoid valve 18 and air pressure regulator 13 beginning compressed-air blows, pressurized air enters in the mixing chamber 6 through compressed air inlet 12, owing to be compressed air inlet 12 and mixing chamber 6 tangent settings, according to the cyclone separator principle, in the time of in tangential gas flow enters mixing chamber 6, rotational gas flow and interior rotational gas flow outside can in the chamber, forming, because jet exit 10 is arranged on " funnel " portion 17 of described mixing chamber 6 bottoms, outer rotational gas flow can attach chamber wall rotation, and towards blowing away from the direction of jet exit 10, promptly upwards blow, when reaching the mixing chamber top, can form interior rotational gas flow again, with export-oriented air-flow reversing motion, simultaneously, when air-flow collects in spray-hole 16 places, under the jet pressure effect of metering valve 4, the reducing agent that ejects is fully stirred by interior rotational gas flow, and blow downwards, be blown into the outlet pipe (not shown) through jet exit 10 and carry out selective catalytic reduction reaction; In mixing chamber,, reduce the crystallization risk, and help forming uniform spraying at the nozzle place because stirring action can form aqueous solution of urea uniform suspension and send to jet exit 10 places.
As mentioned above, described mixing chamber bottom is a funnel-shaped structure, jet exit is arranged on " funnel " portion 17 middle positions, because mixed injection device Vertical direction of the present invention is provided with, like this, even pressurized air accidental interruption, aqueous solution of urea also can rely on action of gravity to discharge, simultaneously, if injection pipe rises to the nozzle place in real work, pressurized air interrupts purging the liquid in the injection pipe, under action of gravity, liquid in the injection pipe can be back in the mixing chamber, and " funnel " portion 17 can the storage area aqueous solution of urea, prevents that liquid from stopping up compressed air inlet 12 and metering valve spray-hole 16; When carrying out urea-spray once more, DCU opens air pressure regulator 13 earlier and purges, and crystallization is easy to be compressed air and melts purging, does not influence and continues to spray.
To sum up, gas-liquid mixed injection apparatus design is ingenious, simple in structure in the exhaust gas aftertreatment system of the present invention, control is convenient, and mixed aerosol is effective, can effectively solve the crystallization of mixing chamber internal cause and the phenomenon that results in blockage.
In this specification, the present invention is described with reference to its certain embodiments.But, still can make various modifications and conversion obviously and do not deviate from the spirit and scope of the present invention, therefore, specification and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (7)
1. the gas-liquid mixing stirring device in the urea solution metering injection system, comprise the metering valve of injection reduction agent, the mixing chamber that is used for gas-liquid mixed, compressed air inlet and jet exit, it is characterized in that: described compressed air inlet is arranged on the described mixing chamber sidewall, and tangent with described mixing chamber inwall.
2. the gas-liquid mixing stirring device in the urea solution metering injection system according to claim 1, it is characterized in that: the Way in of described compressed air inlet and mixing chamber are axially perpendicular, rotational gas flow and interior rotational gas flow outside forming when the compressed air inlet of pressurized air enters mixing chamber.
3. according to the gas-liquid mixing stirring device in claim 1 or the described urea solution metering injection system of claim 2, it is characterized in that: described mixing chamber bottom is a funnel-shaped structure, form one " funnel " portion, described jet exit is arranged on the middle position of described " funnel " portion.
4. the gas-liquid mixing stirring device in the urea solution metering injection system according to claim 3 is characterized in that: described compressed air inlet is arranged on the upside of described " funnel " portion.
5. the gas-liquid mixing stirring device in the urea solution metering injection system according to claim 1 is characterized in that: described metering valve is arranged on the upside of described mixing chamber, and the metering valve spray-hole extends to the inside of described mixing chamber.
6. the gas-liquid mixing stirring device in the urea solution metering injection system according to claim 5 is characterized in that: described mixing chamber and metering valve are tightly connected by seal ring.
7. according to the gas-liquid mixing stirring device in the described urea solution metering injection system of arbitrary claim in the aforementioned claim, it is characterized in that: described compressed air inlet is connect an air pressure regulator, solenoid valve and source of compressed air of pipeline successively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010102322938A CN102116186A (en) | 2010-07-21 | 2010-07-21 | Gas-liquid stirring and mixing device of urea solution metering injection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102322938A CN102116186A (en) | 2010-07-21 | 2010-07-21 | Gas-liquid stirring and mixing device of urea solution metering injection system |
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| CN102116186A true CN102116186A (en) | 2011-07-06 |
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| CN2010102322938A Pending CN102116186A (en) | 2010-07-21 | 2010-07-21 | Gas-liquid stirring and mixing device of urea solution metering injection system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889109A (en) * | 2011-07-11 | 2013-01-23 | 苏州派格丽减排系统有限公司 | Anti-blocking device for air orifice in SCR (Selective Catalytic Reduction) injection system |
| CN103032136A (en) * | 2011-10-02 | 2013-04-10 | 苏州派格丽减排系统有限公司 | Selective catalytic reduction (SCR) system with external mixing nozzle metering structure |
| CN103631100A (en) * | 2012-08-29 | 2014-03-12 | 无锡华润上华半导体有限公司 | Wafer development apparatus and method |
| CN106593586A (en) * | 2016-11-29 | 2017-04-26 | 潍柴动力空气净化科技有限公司 | Urea injection device for engine SCR system |
| CN113090363A (en) * | 2021-04-27 | 2021-07-09 | 广西卡迪亚科技有限公司 | SCR urea supersonic speed jet atomization injection assembly |
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| CN2293377Y (en) * | 1997-05-30 | 1998-10-07 | 萧金芝 | Gas & liquid mixer |
| GB2363084A (en) * | 2000-06-05 | 2001-12-12 | Ford Global Tech Inc | Exhaust gas purification system |
| CN1560439A (en) * | 2004-02-27 | 2005-01-05 | 清华大学 | A reducing agent supply device for a nitrogen oxide catalytic converter of an internal combustion engine |
| CN101493027A (en) * | 2009-01-14 | 2009-07-29 | 无锡市凯龙汽车设备制造有限公司 | Air mixing and metering system for processing vehicle exhaust |
| CN201826931U (en) * | 2010-07-21 | 2011-05-11 | 苏州派格力减排系统有限公司 | Gas-liquid stirring and mixing device in metering and spraying system of urea solution |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2293377Y (en) * | 1997-05-30 | 1998-10-07 | 萧金芝 | Gas & liquid mixer |
| GB2363084A (en) * | 2000-06-05 | 2001-12-12 | Ford Global Tech Inc | Exhaust gas purification system |
| CN1560439A (en) * | 2004-02-27 | 2005-01-05 | 清华大学 | A reducing agent supply device for a nitrogen oxide catalytic converter of an internal combustion engine |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102889109A (en) * | 2011-07-11 | 2013-01-23 | 苏州派格丽减排系统有限公司 | Anti-blocking device for air orifice in SCR (Selective Catalytic Reduction) injection system |
| CN102889109B (en) * | 2011-07-11 | 2015-11-18 | 苏州派格丽减排系统有限公司 | The anti-block device of SCR ejecting system hollow moral discharge orifice |
| CN103032136A (en) * | 2011-10-02 | 2013-04-10 | 苏州派格丽减排系统有限公司 | Selective catalytic reduction (SCR) system with external mixing nozzle metering structure |
| CN103032136B (en) * | 2011-10-02 | 2015-01-21 | 苏州派格丽减排系统有限公司 | Selective catalytic reduction (SCR) system with external mixing nozzle metering structure |
| CN103631100A (en) * | 2012-08-29 | 2014-03-12 | 无锡华润上华半导体有限公司 | Wafer development apparatus and method |
| CN106593586A (en) * | 2016-11-29 | 2017-04-26 | 潍柴动力空气净化科技有限公司 | Urea injection device for engine SCR system |
| CN106593586B (en) * | 2016-11-29 | 2019-07-05 | 潍柴动力股份有限公司 | A kind of urea injection apparatus for engine SCR system |
| CN113090363A (en) * | 2021-04-27 | 2021-07-09 | 广西卡迪亚科技有限公司 | SCR urea supersonic speed jet atomization injection assembly |
| CN113090363B (en) * | 2021-04-27 | 2024-12-03 | 广西沃宾电子科技有限责任公司 | SCR urea supersonic jet atomization injection assembly |
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Address after: 215211, No. 666 Fen Lu, Fen Hu Town, Wujiang City, Jiangsu, Suzhou Applicant after: Suzhou PowerGreen Emission Solution System Co., Ltd. Address before: 215211 Wujiang City, Jiangsu province FENHU Economic Development Zone, the community Fen Road No. 666 Applicant before: Suzhou PowerGreen Emission Solution System Co., Ltd. |
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Application publication date: 20110706 |