CN103032136B - 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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- CN103032136B CN103032136B CN201110293997.0A CN201110293997A CN103032136B CN 103032136 B CN103032136 B CN 103032136B CN 201110293997 A CN201110293997 A CN 201110293997A CN 103032136 B CN103032136 B CN 103032136B
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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, particularly relate to a kind of SCR system with external mix jet meters structure.
Background technique
Existing known, reducing the nitrogen oxide of internal-combustion engine especially in diesel engine vent gas by selective catalytic reduction technology (SCR) is a kind of general technology path, by reducing agent (aqueous solution of urea) through atomization quantitative injection intake and exhaust pipeline, and by SCR catalyst by the main harmful gas NO in waste gas
xchange into nitrogen and water discharge, reach the object of tail gas clean-up.
In prior art, aqueous solution of urea metering jetting device is divided into has gas and without two kinds, gas, gas jet system is had mainly to rely on pump that reducing agent is pumped into metering valve entrance, be ejected in mixing chamber by metering valve accurate-metering, the reducing agent ejected is carried out primary atomization and is blown into nozzle place by high velocity air, atomized spray is again carried out in gas exhaust piping in nozzle ejection process, this system is atomized by secondary injection, atomizing effect is good, but this structure is more complicated, require high to the Stress control in pipeline, power consumption is large, controls complicated; Another kind is airless injection system, the most typical with the DENOXTRONIC2.2 system of BOSCH company in industry, namely metering valve is set directly on outlet pipe, be atomized by the direct metered injection of metering valve, although this system structure is simple, but metering valve is easily burned erosion near outlet pipe, simultaneously owing to can only lean on Liquid inject pressure atomization, atomizing effect is poor.
In order to solve the problem, the applicant discloses a kind of Chinese patent (patent No. is 201020276173.3) of direct injection metering jetting device, this outer mixed construction has been used in pneumatic control system and can have reduced back pressure, can solve fogging problem, but structure is also more complicated simultaneously.
In addition, SCR system designs simplification problem is the main body of current metering injection system, and how simplifying SCR system, to reach rational control mode be the subject matter that domestic and international each producer faces.
Summary of the invention
The object of the invention is to the defect overcoming prior art, it is good that proposition one has atomizing effect, and level of integration is high, and structure simply has the SCR system of external mix jet meters structure, improves tail gas clean-up efficiency.
For achieving the above object, the present invention proposes following technological scheme: the SCR system with external mix jet meters structure, comprises the urea box of storage and reduction agent, urea pump, metering valve, nozzle and source of the gas, described metering valve and described urea pump phase pipeline connection; Described source of the gas and nozzle also pipeline connection, described metering valve is arranged on nozzle, and the reducing agent that the air-flow in described source of the gas and metering valve eject mixes mutually in nozzle; The airflow clearance that described nozzle comprises urea tube, air cap and is formed between urea tube and air cap.Described metering valve is arranged on nozzle.
Described urea pump is arranged in urea box.
Also be provided with pressure regulator valve in described urea box, described pressure regulator valve is connected on the downstream of described urea pump.
Described metering valve upstream is provided with sensor.
Described nozzle also comprises flanged plate and distribution cover, and described distribution is set between described air cap and described flanged plate, described flanged plate, forms air-flow path between distribution cover and air cap.
The SCR system that the present invention has external mix jet meters structure also comprises heating unit, and described heating unit is arranged in described urea box.
Compared with prior art, the present invention has the SCR system of external mix jet meters structure, and level of integration is high, and outer mixing type nozzle structure is simple, and atomization good mixing effect, is also not easily burned, and whole system controls conveniently, to decrease component.
Accompanying drawing explanation
Fig. 1 is the SCR system schematic diagram that the present invention has external mix jet meters 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, clear, complete description is carried out to the technological scheme in the preferred embodiment of the present invention.
As shown in Figure 1, the present invention has the SCR system of external mix jet meters 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 pipeline series connection successively of metering valve 3 and nozzle 6, the reducing agent stored in urea box 1 is pumped into metering valve 3 entrance by described urea pump 2, metering valve 3 pairs of reducing agent accurate-meterings spray, be ejected in outlet pipe 15 by the nozzle 6 be directly installed on outlet pipe 15 again, described pressure regulator valve 5 can play the effect of the pressure of stable metering valve upstream, prevent reducing agent from course of conveying, producing pressure surge.
In the present invention, described metering valve 3 is arranged on described nozzle 6, nozzle 6 is gone back pipeline and be connected with outside air source of the gas 7, the air stream produced in such air source of the gas 7 can blow pressure for the injection of reducing agent provides, and the force value of metering valve 3 upstream can be stablized due to pressure regulator valve 5, 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, pressure reduction can be controlled by the pressure on side quantity sensor 14, outer mixed construction also can provide cooling effect for nozzle 6 simultaneously, metering valve 3 is prevented to be directly installed on outlet pipe 15 ablated.
As Fig. 2, shown in Fig. 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 described flanged plate 62, described urea tube 61 is from top to bottom successively through described flanged plate 62 and distribution cover 63, and extend to the bottom of described air cap 65, airflow clearance 66 is formed between described urea tube 61 and air cap 65, spout 64 is formed between the outlet of described urea tube 61 and airflow clearance 66, described flanged plate 62, distribution cover 63, air-flow path is formed between airflow clearance 66 and spout 64, when reducing agent is spurted in outlet pipe 15 through urea tube 61 and spout 64, air-flow blows through said flow passage simultaneously, fully mix at spout 64 place's reducing agent and air, and blow lower abundant atomization compressed-air actuated, in this structure, all air pipe lines and mixed pipe line are all arranged on the inside of described nozzle 6, substantially not by external high temperature environmetal impact, harsh pressure requirements is not had yet to other pipeline of reducing agent conveying, structure is simple, it is convenient to control.
The SCR system that the present invention has external mix jet meters structure also comprises measurement control unit (DCU) 8, described measurement control unit 8 signal connects described urea pump 2, metering valve 3 and sensor 14, and controls the action of urea pump 2 and the metered injection of metering valve.
The described SCR system with external mix jet meters structure also comprises filter 12, the upstream that described filter 12 is arranged on described metering valve (both can be arranged on outside urea box, also can be arranged in urea box), described filter carries out filter cleaning to the reducing agent in pipeline, prevents dust impurity from entering in delivery line.
As shown in Figure 1, the SCR system that the present invention has external mix jet meters structure also comprises heating unit 4, described heating unit 4 is arranged in described urea box 1, described urea pump 2 is also arranged in described urea box 1, described filter 12, sensor 14 etc. is integrated on urea box 1, Integrated design can avoid unit to heat respectively, heating unit 4 can heat the pipeline between these parts while heating reducing agent in urea box, heating is separately avoided to increase cost, urea pump embedding structure also can be avoided heating separately pump tubing length, while reducing agent in heating urea case, the reducing agent in pump tubing length is heated, in addition, urea pump embedding structure can reduce back pressure, maintenance discharge pressure is stablized.
In the present invention, the reducing agent that the air-flow that air source of the gas 7 provides and metering valve 3 eject can fully mix and be atomized in nozzle 6, and improves jet pressure, and reducing agent is spurted in outlet pipe 15 by nozzle 6.
Preferably, described urea pump 2 is arranged near the heat exchanger of bottom in described heating unit 4, is convenient to reducing agent and aspirates after thawing.
The SCR system level of integration that the present invention has external mix jet meters structure is high, heating effect is good, highly integratedly save arrangement space, outer mixing type nozzle reduces or offsets back pressure in pipeline, and mixed aerosol is effective, be arranged in outlet pipe and also not easily burnt, pressure regulator valve control accuracy is high, and meanwhile, urea pump embedding structure can reduce back pressure, whole system pressure stability, improves the working life of urea pump.
Claims (3)
1. one kind has the SCR system of external mix jet meters structure, comprise the urea box of storage and reduction agent, urea pump, metering valve, nozzle and source of the gas, described metering valve and described urea pump pipeline connection, it is characterized in that: described urea pump and pressure regulator valve are arranged in urea box, described pressure regulator valve is arranged on the downstream of described urea pump, described source of the gas and nozzle also pipeline connection, described metering valve is arranged on nozzle, and the reducing agent that the air-flow in described source of the gas and metering valve eject mixes mutually in nozzle; Described nozzle comprises urea tube, air cap, is formed at airflow clearance, flanged plate and distribution cover between urea tube and air cap, described distribution is set between described air cap and described flanged plate, described urea tube is from top to bottom successively through described flanged plate and distribution cover, and extend to the bottom of described air cap, form spout between the outlet of described urea tube and airflow clearance, described flanged plate, between distribution cover and air cap, form air-flow path.
2. the SCR system with external mix jet meters structure according to claim 1, is characterized in that: described metering valve upstream is provided with sensor.
3. the SCR system with external mix jet meters structure according to claim 1 and 2, is characterized in that: the SCR system with external mix jet meters structure also comprises heating unit, and described heating unit is arranged in described urea box.
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 |
Applications Claiming Priority (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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| Publication Number | Publication Date |
|---|---|
| CN103032136A CN103032136A (en) | 2013-04-10 |
| CN103032136B true 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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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105822393B (en) * | 2015-01-07 | 2019-08-06 | 浙江福爱电子有限公司 | A kind of gas assisted atomization liquid meter injection 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 |
| CN113107653B (en) * | 2021-04-27 | 2022-09-23 | 广西沃宾电子科技有限责任公司 | Control method of engine SCR tail gas emission post-treatment system |
| CN113513400B (en) * | 2021-05-18 | 2022-07-12 | 无锡市博瑞斯通科技技术有限公司 | Gas cooling automatic control nozzle |
Citations (6)
| 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 |
| 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 |
| CN201361598Y (en) * | 2008-11-07 | 2009-12-16 | 清华大学 | Dripping-free air auxiliary atomizing nozzle |
| 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 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6997405B2 (en) * | 2002-09-23 | 2006-02-14 | Spraying Systems Co. | External mix air atomizing spray nozzle assembly |
| JP4775200B2 (en) * | 2006-09-15 | 2011-09-21 | トヨタ自動車株式会社 | Exhaust gas purification system for internal combustion engine |
| US20110147491A1 (en) * | 2009-12-22 | 2011-06-23 | Spraying System Co. | Internal mix air atomizing spray nozzle assembly |
-
2011
- 2011-10-02 CN CN201110293997.0A patent/CN103032136B/en not_active Expired - Fee Related
Patent Citations (6)
| 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 |
| 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 |
| CN201361598Y (en) * | 2008-11-07 | 2009-12-16 | 清华大学 | Dripping-free air auxiliary atomizing nozzle |
| 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 |
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| CN103032136A (en) | 2013-04-10 |
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