CN103032136A - Selective catalytic reduction (SCR) system with external mixing nozzle metering structure - Google Patents
Selective catalytic reduction (SCR) system with external mixing nozzle metering structure Download PDFInfo
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- CN103032136A CN103032136A CN2011102939970A CN201110293997A CN103032136A CN 103032136 A CN103032136 A CN 103032136A CN 2011102939970 A CN2011102939970 A CN 2011102939970A CN 201110293997 A CN201110293997 A CN 201110293997A CN 103032136 A CN103032136 A CN 103032136A
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Abstract
The invention discloses a selective catalytic reduction (SCR) system with an external mixing nozzle metering structure. The system comprises a urea tank used for storing reducing agent, a urea pump, a metering valve, a nozzle and an air source. The metering valve is communicated with a urea pump pipeline, the air resource is communicated with a nozzle pipeline, the metering valve is arranged on the nozzle, and air flow in the air source and the reducing agent sprayed by the metering valve are mixed in the nozzle. The nozzle comprises a urea pipe, an air cap and an air flow gap formed between the urea pipe and the air cap. The SCR system with the external mixing nozzle metering structure has the advantages that an integration level is high, the external mixing type nozzle structure is simple, an atomization mixing effect is good, and the whole system is convenient to control.
Description
Technical field
The present invention relates to a kind of exhaust gas from diesel vehicle post-processing purifying system, relate in particular to a kind of SCR system with external mix nozzle measurement structure.
Background technique
Existing known, by selective catalytic reduction technology (SCR) reduce internal-combustion engine especially the nitrogen oxide in the diesel engine vent gas be a kind of general technology path, be about to reducing agent (aqueous solution of urea) through atomizing quantitative injection intake and exhaust pipeline, and pass through the SCR catalyzer with the main harmful gas NO in the waste gas
xChange into the nitrogen G﹠W and discharge, reach the purpose of tail gas clean-up.
In the prior art, the aqueous solution of urea metering jetting device is divided into has gas and without two kinds in gas, there is the gas jet system mainly to rely on pump that reducing agent is pumped into the metering valve entrance, be ejected in the mixing chamber by the metering valve accurate-metering, high velocity air carries out the reducing agent that ejects primary atomization and is blown into the nozzle place, again carry out atomized spray in the nozzle ejection process in gas exhaust piping, this system atomizes by secondary injection, atomizing effect is good, but this structure is complicated, control requires height to the pressure in the pipeline, and power consumption is large, and control is complicated; Another kind is airless injection system, the most typical with the DENOXTRONIC2.2 system of BOSCH company in industry, be that metering valve is set directly on the outlet pipe, by the direct metered injection of metering valve and atomizing, although this system is simple in structure, but metering valve is burned erosion easily near outlet pipe, owing to can only lean on the atomizing of liquid jet pressure, atomizing effect is poor simultaneously.
In order to address the above problem, the applicant discloses a kind of Chinese patent (patent No. is 201020276173.3) of direct injection metering jetting device, should outer mixed construction use in gas control system processed is arranged, can reduce back pressure, can solve the atomizing problem simultaneously, but structure be also complicated.
In addition, SCR system architecture simplification problem is the main body of present metering injection system, and how simplifying the SCR system, to reach rational control mode be the domestic and international subject matter that faces of each producer.
Summary of the invention
The object of the invention is to overcome the defective of prior art, propose that a kind of to have an atomizing effect good, level of integration is high, and the SCR system with external mix nozzle measurement structure simple in structure, improves tail gas clean-up efficient.
For achieving the above object, the present invention proposes following technological scheme: have the SCR system of external mix nozzle measurement structure, comprise urea box, urea pump, metering valve, nozzle and the source of the gas of storage and reduction agent, described metering valve and described urea pump phase pipeline connection; Described source of the gas and nozzle be pipeline connection also, and described metering valve is arranged on the nozzle, and the air-flow in the described source of the gas mixes in nozzle mutually with the reducing agent that metering valve ejects; Described nozzle comprise urea tube, air cap and be formed at urea tube and air cap between airflow clearance.Described metering valve is arranged on the nozzle.
Described urea pump is arranged in the urea box.
Also be provided with pressure regulator valve in the described urea box, described pressure regulator valve is connected on the downstream of described urea pump.
Described metering valve provided upstream is equipped with sensor.
Described nozzle also comprises flanged plate and distribution cover, and described distribution is set between described air cap and the described flanged plate, forms air-flow path between described flanged plate, distribution cover and the air cap.
The SCR system that the present invention has external mix nozzle measurement structure also comprises heating unit, and described heating unit is arranged in the described urea box.
Compared with prior art, the present invention has the SCR system of external mix nozzle measurement structure, and level of integration is high, and outer mixing type nozzle is simple in structure, and the atomizing good mixing effect also is difficult for being burned, and whole system control is convenient, has reduced component.
Description of drawings
Fig. 1 is the SCR systematic schematic diagram that the present invention has external mix nozzle measurement structure;
Fig. 2 is the stereogram of nozzle arrangements of the present invention;
Fig. 3 is the sectional view of nozzle arrangements of the present invention.
Embodiment
Below in conjunction with accompanying drawing of the present invention, the technological scheme in the preferred embodiment of the present invention is carried out clear, complete description.
As shown in Figure 1, the present invention has the SCR system of external mix nozzle measurement structure, comprise urea box 1, urea pump 2, pressure regulator valve 5, sensor 14, metering valve 3 and nozzle 6, described urea pump 2, pressure regulator valve 5, filter 12, sensor 14, the successively pipeline series connection of metering valve 3 and nozzle 6, described urea pump 2 is pumped into metering valve 3 entrances with the reducing agent of urea box 1 interior storage, 3 pairs of reducing agent accurate-meterings of metering valve spray, be ejected in the outlet pipe 15 by the nozzle 6 that is directly installed on the outlet pipe 15 again, described pressure regulator valve 5 can play the effect of the pressure of stablizing the metering valve upstream, prevents that reducing agent from producing pressure surge in course of conveying.
Among the present invention, described metering valve 3 is arranged on the described nozzle 6, go back pipeline on the nozzle 6 and be connected with outside air source of the gas 7, the air stream that produces in the air source of the gas 7 like this can provide for the injection of reducing agent and blow pressure, and because pressure regulator valve 5 can be stablized the force value of metering valve 3 upstreams, therefore the back pressure of outlet pipe 15 can be offset by the vacuum that outer mixed gas produces, so the pressure differential deltap P of metering valve upstream and downstream is the force value of metering valve upstream, can control pressure reduction by the pressure on the side quantity sensor 14, outer mixed construction also can be for nozzle 6 provides cooling effect simultaneously, and it is ablated to prevent that metering valve 3 is directly installed on the outlet pipe 15.
Such as Fig. 2, shown in Figure 3, the outer mixing type nozzle 6 of the present invention comprises urea tube 61, flanged plate 62, distribution cover 63 and air cap 65, described distribution cover 63 is arranged between described air cap 65 and the described flanged plate 62, described urea tube 61 passes described flanged plate 62 and distribution cover 63 from top to bottom successively, and extend to the bottom of described air cap 65,65 of described urea tube 61 and air caps form airflow clearance 66, form spout 64 between the outlet of described urea tube 61 and the airflow clearance 66, described flanged plate 62, distribution cover 63, form air-flow path between airflow clearance 66 and the spout 64, spurt into outlet pipe 15 when interior at reducing agent through urea tube 61 and spout 64, air-flow blows through the said flow passage simultaneously, fully mix at spout 64 place's reducing agents and air, and blow lower abundant atomizing compressed-air actuated, in this structure, all air pipe lines and mixed pipe line all are arranged on the inside of described nozzle 6, substantially be not subjected to outside Effect of Hyperthermic Environment, other pipeline that reducing agent is carried does not have harsh pressure requirement yet, simple in structure, control is convenient.
The SCR system that the present invention has external mix nozzle measurement structure also comprises measurement control unit (DCU) 8, described measurement control unit 8 signals connect described urea pump 2, metering valve 3 and sensor 14, and the action of control urea pump 2 and the metered injection of metering valve.
Described SCR system with external mix nozzle measurement structure also comprises filter 12, the upstream that described filter 12 is arranged on described metering valve (both can be arranged on outside the urea box, also can be arranged in the urea box), described filter carries out filter cleaning to the reducing agent in the pipeline, prevents that dust impurity from entering in the delivery line.
As shown in Figure 1, the SCR system that the present invention has external mix nozzle measurement structure also comprises heating unit 4, described heating unit 4 is arranged in the described urea box 1, described urea pump 2 also is arranged in the described urea box 1, described filter 12, sensor 14 grades are integrated on the urea box 1, Integrated design can avoid unit to heat respectively, heating unit 4 can heat the pipeline between these parts when reducing agent heats in to urea box, avoiding separately, heating increases cost, the urea pump embedding structure also can be avoided the pumping pipeline is heated separately, in the reducing agent in the heating urea case reducing agent in the pumping pipeline is heated, in addition, the urea pump embedding structure can reduce back pressure, and it is stable to keep discharge pressure.
Among the present invention, the reducing agent that the air-flow that air source of the gas 7 provides and metering valve 3 eject is in 6 interior can fully mixing and atomize of nozzle, and improves jet pressure, and reducing agent is spurted in the outlet pipe 15 by nozzle 6.
Preferably, described urea pump 2 is arranged near the heat exchanger of bottom in the described heating unit 4, is convenient to reducing agent and aspirates after thawing.
The SCR level of integrated system that the present invention has external mix nozzle measurement structure is high, heating effect is good, the highly integrated arrangement space of having saved, outer mixing type nozzle reduce or offset back pressure in the pipeline, and mixed aerosol is effective, be arranged on and also be difficult in the outlet pipe being burnt, the pressure regulator valve control accuracy is high, and simultaneously, the urea pump embedding structure can reduce back pressure, the whole system pressure stability, the working life of improving urea pump.
Claims (6)
1. SCR system with external mix nozzle measurement structure, the urea box, urea pump, metering valve, nozzle and the source of the gas that comprise the storage and reduction agent, described metering valve and described urea pump pipeline connection, it is characterized in that: described source of the gas and nozzle be pipeline connection also, described metering valve is arranged on the nozzle, and the air-flow in the described source of the gas mixes in nozzle mutually with the reducing agent that metering valve ejects; Described nozzle comprise urea tube, air cap and be formed at urea tube and air cap between airflow clearance.
2. the SCR system with external mix nozzle measurement structure according to claim 1, it is characterized in that: described urea pump is arranged in the urea box.
3. the SCR system with external mix nozzle measurement structure according to claim 2, it is characterized in that: also be provided with pressure regulator valve in the described urea box, described pressure regulator valve is installed in the downstream of described urea pump.
4. the SCR system with external mix nozzle measurement structure according to claim 3, it is characterized in that: described metering valve provided upstream is equipped with sensor.
5. according to claim 1 to the described SCR system with external mix nozzle measurement structure of 4 any one, it is characterized in that: the SCR system with external mix nozzle measurement structure also comprises heating unit, and described heating unit is arranged in the described urea box.
6. the SCR system with external mix nozzle measurement structure according to claim 1, it is characterized in that: described nozzle also comprises flanged plate and distribution cover, described distribution is set between described air cap and the described flanged plate, forms air-flow path between described flanged plate, distribution cover and the air cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110293997.0A CN103032136B (en) | 2011-10-02 | 2011-10-02 | Selective catalytic reduction (SCR) system with external mixing nozzle metering structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110293997.0A CN103032136B (en) | 2011-10-02 | 2011-10-02 | Selective catalytic reduction (SCR) system with external mixing nozzle metering structure |
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| CN103032136A true CN103032136A (en) | 2013-04-10 |
| CN103032136B CN103032136B (en) | 2015-01-21 |
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| CN201110293997.0A Expired - Fee Related CN103032136B (en) | 2011-10-02 | 2011-10-02 | Selective catalytic reduction (SCR) system with external mixing nozzle metering structure |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104879198A (en) * | 2015-05-29 | 2015-09-02 | 潍柴动力股份有限公司 | SCR (Selective Catalytic Reduction) system and catalytic reaction unit thereof |
| CN105822393A (en) * | 2015-01-07 | 2016-08-03 | 浙江福爱电子有限公司 | Gas-assisted atomized liquid metering jet apparatus |
| CN108266252A (en) * | 2018-03-26 | 2018-07-10 | 浙江爱力浦科技股份有限公司 | A kind of air cooling air-assisted automatic control type urea liquid spraying system |
| CN108547686A (en) * | 2018-06-22 | 2018-09-18 | 南京依柯卡特排放技术股份有限公司 | Distributed energy tail gas clean-up DeNOx system urea meter-mixers |
| CN113107653A (en) * | 2021-04-27 | 2021-07-13 | 广西卡迪亚科技有限公司 | Control method of engine SCR tail gas emission post-treatment system |
| CN113513400A (en) * | 2021-05-18 | 2021-10-19 | 无锡市博瑞斯通科技技术有限公司 | Gas cooling automatic control nozzle |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2168654Y (en) * | 1993-04-28 | 1994-06-15 | 沈阳开发区沈重喷射润滑设备厂 | Nozzle of spraying lubricator |
| US5540385A (en) * | 1993-11-22 | 1996-07-30 | Itw Limited | Spray nozzle for high volume low pressure air |
| US20040056124A1 (en) * | 2002-09-23 | 2004-03-25 | Spraying Systems Co. | External mix air atomizing spray nozzle assembly |
| CN1560439A (en) * | 2004-02-27 | 2005-01-05 | 清华大学 | Apparatus for supplying reducing agent to hydroxide catalyzing transforming device of internal combustion engine |
| JP2008069731A (en) * | 2006-09-15 | 2008-03-27 | Toyota Motor Corp | Exhaust emission control system of internal combustion engine |
| CN201361598Y (en) * | 2008-11-07 | 2009-12-16 | 清华大学 | Dripping-free air auxiliary atomizing nozzle |
| US20110147491A1 (en) * | 2009-12-22 | 2011-06-23 | Spraying System Co. | Internal mix air atomizing spray nozzle assembly |
| CN102116186A (en) * | 2010-07-21 | 2011-07-06 | 苏州派格力减排系统有限公司 | Gas-liquid stirring and mixing device of urea solution metering injection system |
| CN202325770U (en) * | 2011-10-02 | 2012-07-11 | 苏州派格力减排系统有限公司 | SCR (silicon controlled rectifier) system with external mixing nozzle metering structure |
-
2011
- 2011-10-02 CN CN201110293997.0A patent/CN103032136B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2168654Y (en) * | 1993-04-28 | 1994-06-15 | 沈阳开发区沈重喷射润滑设备厂 | Nozzle of spraying lubricator |
| US5540385A (en) * | 1993-11-22 | 1996-07-30 | Itw Limited | Spray nozzle for high volume low pressure air |
| US20040056124A1 (en) * | 2002-09-23 | 2004-03-25 | Spraying Systems Co. | External mix air atomizing spray nozzle assembly |
| CN1560439A (en) * | 2004-02-27 | 2005-01-05 | 清华大学 | Apparatus for supplying reducing agent to hydroxide catalyzing transforming device of internal combustion engine |
| JP2008069731A (en) * | 2006-09-15 | 2008-03-27 | Toyota Motor Corp | Exhaust emission control system of internal combustion engine |
| CN201361598Y (en) * | 2008-11-07 | 2009-12-16 | 清华大学 | Dripping-free air auxiliary atomizing nozzle |
| US20110147491A1 (en) * | 2009-12-22 | 2011-06-23 | Spraying System Co. | Internal mix air atomizing spray nozzle assembly |
| CN102116186A (en) * | 2010-07-21 | 2011-07-06 | 苏州派格力减排系统有限公司 | Gas-liquid stirring and mixing device of urea solution metering injection system |
| CN202325770U (en) * | 2011-10-02 | 2012-07-11 | 苏州派格力减排系统有限公司 | SCR (silicon controlled rectifier) system with external mixing nozzle metering structure |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105822393A (en) * | 2015-01-07 | 2016-08-03 | 浙江福爱电子有限公司 | Gas-assisted atomized liquid metering jet apparatus |
| CN104879198A (en) * | 2015-05-29 | 2015-09-02 | 潍柴动力股份有限公司 | SCR (Selective Catalytic Reduction) system and catalytic reaction unit thereof |
| CN108266252A (en) * | 2018-03-26 | 2018-07-10 | 浙江爱力浦科技股份有限公司 | A kind of air cooling air-assisted automatic control type urea liquid spraying system |
| CN108547686A (en) * | 2018-06-22 | 2018-09-18 | 南京依柯卡特排放技术股份有限公司 | Distributed energy tail gas clean-up DeNOx system urea meter-mixers |
| CN113107653A (en) * | 2021-04-27 | 2021-07-13 | 广西卡迪亚科技有限公司 | Control method of engine SCR tail gas emission post-treatment system |
| CN113513400A (en) * | 2021-05-18 | 2021-10-19 | 无锡市博瑞斯通科技技术有限公司 | Gas cooling automatic control nozzle |
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| CN103032136B (en) | 2015-01-21 |
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