WO2002024311A1 - Verfahren und vorrichtung zur dosierung eines reduktionsmittels zur entfernung von stickoxiden aus abgasen - Google Patents
Verfahren und vorrichtung zur dosierung eines reduktionsmittels zur entfernung von stickoxiden aus abgasen Download PDFInfo
- Publication number
- WO2002024311A1 WO2002024311A1 PCT/DE2001/003621 DE0103621W WO0224311A1 WO 2002024311 A1 WO2002024311 A1 WO 2002024311A1 DE 0103621 W DE0103621 W DE 0103621W WO 0224311 A1 WO0224311 A1 WO 0224311A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- line
- reducing agent
- metering
- actuator
- pump
- Prior art date
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9495—Controlling the catalytic process
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1466—Means for venting air out of conduits or tanks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1473—Overflow or return means for the substances, e.g. conduits or valves for the return path
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/7722—Line condition change responsive valves
- Y10T137/7758—Pilot or servo controlled
- Y10T137/7761—Electrically actuated valve
Definitions
- the invention is based on a method or a device for metering a reducing agent, in particular a urea or a urea-water solution in the context of a catalytic exhaust gas aftertreatment, according to the preamble of the independent claims.
- reduction catalysts In order to achieve a reduction in NO ⁇ components in exhaust gases, reduction catalysts have been developed, especially for diesel engines, which are usually subdivided into so-called SCR (selective catalytic reduction) catalysts and storage catalysts.
- SCR catalysts are produced using a urea and / or ammonia reducing agent supply is regenerated, while the so-called storage catalysts are regenerated with hydrocarbons of the internal combustion engine fuel carried in so-called exhaust gas fat phases.
- a device which, for example, for removing nitrogen oxides in exhaust gases metered urea as a reducing agent in a diesel engine.
- the metering takes place via a valve which releases urea cans which are determined via the electrical control of the metering valve, its throttle cross section and the pressure difference applied to the throttle valve.
- the metering device has a return line for returning excess reducing agent and a vent valve for removing gas bubbles from air or evaporated reducing agent.
- the method according to the invention and the metering device according to the invention with the characterizing features of the independent claims have the advantage over the prior art of providing simple venting or a compact, component-reduced design of a metering device.
- a separate vent valve is no longer necessary, and the additional lines required for this are also dispensed with, so that the line routing is simplified and the liquid volume to be heated in the metering device for correct operation is reduced, which in turn saves energy and costs.
- the metering accuracy is improved, since pressure drops in the supply line, for example as a result of air pockets or inclusions of evaporated urea-water solution, can be compensated for by an appropriate metering.
- the elimination of a separate ventilation valve not only saves component costs and time during assembly, but also
- Total metering device can be arranged on a smaller housing block.
- FIG. 1 shows a metering device interconnected with a water tank, a urea tank and a catalyst arrangement.
- Fig. 1 denotes a urea tank, from which a urea-water solution ("HWL") via a Urea line la is led to a filter 3 designed as a filter screen.
- the filter 3 is connected via a line 12 to a check valve 2, through which the HWL is sucked in by a feed pump 4, for example a membrane pump, and to one
- Metering valve 7 of a mixing chamber 8 is conveyed.
- the pump 4 is speed-controlled via a control motor 4a in order to minimize the overflow quantity.
- a superseded quantity is returned to the suction side of the pump via a pressure relief valve 11. From a compressed air tank 20
- Compressed air can be introduced into the mixing chamber via a compressed air line 2a with a filter screen 21, a 2/2-way valve 22, a throttle 23 and a check valve 24.
- An aerosol line 25 leads from the mixing chamber 8 to the catalytic converter 30, which has an exhaust gas supply 29 on one side and an exhaust gas outlet 31 on the opposite side.
- the urea tank 1 is provided with a level sensor 52 and a temperature sensor 51.
- a pressure sensor 50 is arranged on the line 12 between the metering pump 4 and the metering valve 7.
- Temperature sensors 53 and 54 measure the temperature of the exhaust gas at the inlet and outlet of the catalytic converter 30.
- a pressure sensor 55 is provided between the 2/2-way valve 22 and the throttle 23.
- a temperature sensor 56 measures the temperature of a metallic housing block 41, on which the one with this
- a control unit 40 is also attached to the housing block 41 and is electrically connected both to the sensors 50 to 56 and to the control motor 4a and the metering valve 7.
- the housing block 41 is grounded, the control device 40 draws the electrical potential of the housing block 41 as a reference potential.
- the control unit 40 is connected to the voltage supply via a CAN data line 39 (CAN is an abbreviation for the English term “Controlled Area Network”) and other electronic components in the motor vehicle, in particular the engine control unit.
- the metering valve 7 doses the required urea water solution into the mixing chamber 8.
- the mixing chamber the
- Urea water solution by means of the compressed air produces an aerosol and a wall film which is introduced into the catalytic converter 30 via the aerosol line 25.
- the control unit 40 detects signals
- Engine operating data which are received by a higher-level engine control unit via the CAN data line 39, as well as the signals from pressure, temperature or level sensors 51 to 56, which are known per se and are not further explained here.
- the control unit 40 receives an electrical signal from the pressure sensor 50, from which the time-dependent course of the pressure in the line 12 between the metering pump 4 and the metering valve 7 results. From the sensor information, the control device 40 calculates a urea metering amount which is to be added to an exhaust gas flowing through the catalytic converter 30.
- the control unit 40 controls the urea-water solution pressure or the pressure in the compressed air line with the aid of the metering valve 7 and the valve 22.
- the pressure relief valve 11 which acts as an overflow valve, returns an excessive amount of reducing agent conveyed by the pump 4 to the suction side of the pump.
- the overcurrent quantities are generally small in a speed-controlled feed pump or a metering pump, since they can convey liquids relatively well as required, so that only small tolerances may have to be compensated for by means of the bypass formed by the overflow valve. - If the pressure in the system, for example, by If air pockets fall off, the control unit opens the metering valve 7 so that it can be vented via this valve.
- the control unit can call up a data map stored in it, which, for example, assigns a correspondingly extended opening time of the metering valve to each value of a pressure difference between the actual value and the setpoint value of the pressure, in order to ensure the injection of a correct amount of reducing agent ,
- the dosing device can also be used without compressed air support, i.e. without using the components 20 to 24.
- the pressure sensor 50 can also be replaced by a mass flow sensor.
- the data map stored in a memory of the control unit must then of course be adapted to the changed input variable (mass of a defined volume instead of pressure) in order to carry out injection corrections in the event of pressure drops even when using this alternative sensor.
- the mass measured in a mass sensor correlates in any case with the pressure prevailing in the line, so that gas inclusions and thus pressure drops are also recognized by means of a mass sensor.
- the pressure relief valve 11 can also be installed such that its inlet facing the outlet of the pump 4 is arranged directly on the line 12; as a result, the line section between the pressure limiting valve 11 and the line 12 shown in FIG. 1 can be omitted.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/130,361 US6912846B2 (en) | 2000-09-22 | 2001-09-20 | Method and apparatus for metering a reducing agent for removing nitrogen oxides from exhaust gases |
EP01980179A EP1322402B1 (de) | 2000-09-22 | 2001-09-20 | Verfahren und vorrichtung zur dosierung eines reduktionsmittels zur entfernung von stickoxiden aus abgasen |
JP2002528375A JP4732672B2 (ja) | 2000-09-22 | 2001-09-20 | 排ガスから窒素酸化物を除去するための還元剤を調量する方法及び装置 |
DE50104900T DE50104900D1 (de) | 2000-09-22 | 2001-09-20 | Verfahren und vorrichtung zur dosierung eines reduktionsmittels zur entfernung von stickoxiden aus abgasen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10047516.7 | 2000-09-22 | ||
DE10047516A DE10047516A1 (de) | 2000-09-22 | 2000-09-22 | Verfahren und Vorrichtung zur Dosierung eines Reduktionsmittels zur Entfernung von Stickoxiden aus Abgasen |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002024311A1 true WO2002024311A1 (de) | 2002-03-28 |
Family
ID=7657584
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2001/003621 WO2002024311A1 (de) | 2000-09-22 | 2001-09-20 | Verfahren und vorrichtung zur dosierung eines reduktionsmittels zur entfernung von stickoxiden aus abgasen |
Country Status (6)
Country | Link |
---|---|
US (1) | US6912846B2 (de) |
EP (1) | EP1322402B1 (de) |
JP (1) | JP4732672B2 (de) |
KR (1) | KR100859426B1 (de) |
DE (2) | DE10047516A1 (de) |
WO (1) | WO2002024311A1 (de) |
Cited By (6)
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WO2003033111A2 (de) * | 2001-10-12 | 2003-04-24 | Siemens Aktiengesellschaft | Verfahren und vorrichtung zur abgasnachbehandlung bei einer brennkraftmaschine |
WO2005099874A1 (de) * | 2004-04-15 | 2005-10-27 | Robert Bosch Gmbh | Verfahren und vorrichtung zum einbringen eines reagenzmittels in einen abgaskanal einer brennkraftmaschine |
EP1655463A1 (de) * | 2003-07-30 | 2006-05-10 | Nissan Diesel Motor Co., Ltd. | Abgasreinigungsvorrichtung für motor |
EP2582935A1 (de) * | 2010-06-21 | 2013-04-24 | Scania CV AB (publ) | Verfahren zur luftbeseitigung aus einem hc-dosiersystem sowie hc-dosiersystem |
WO2018041792A1 (de) * | 2016-09-01 | 2018-03-08 | Bayerische Motoren Werke Aktiengesellschaft | Zuführvorrichtung für eine gefriergefährdete flüssigkeit in eine fluidleitung eines kraftfahrzeugs |
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EP1691046B1 (de) * | 2003-09-19 | 2013-04-24 | Nissan Diesel Motor Co., Ltd. | Abgasreinigungsvorrichtung für eine brennkraftmaschine |
EP2426329B1 (de) * | 2003-09-19 | 2013-05-01 | Nissan Diesel Motor Co., Ltd. | Abgasentgiftungsvorrichtung für Motor |
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EP2582947A1 (de) * | 2010-06-21 | 2013-04-24 | Scania CV AB (publ) | Verfahren zur luftbeseitigung aus einem hc-dosiersystem sowie hc-dosiersystem |
EP2582935A4 (de) * | 2010-06-21 | 2014-08-13 | Scania Cv Abp | Verfahren zur luftbeseitigung aus einem hc-dosiersystem sowie hc-dosiersystem |
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Also Published As
Publication number | Publication date |
---|---|
US6912846B2 (en) | 2005-07-05 |
KR100859426B1 (ko) | 2008-09-23 |
US20040060286A1 (en) | 2004-04-01 |
EP1322402B1 (de) | 2004-12-22 |
EP1322402A1 (de) | 2003-07-02 |
JP4732672B2 (ja) | 2011-07-27 |
KR20020053870A (ko) | 2002-07-05 |
DE10047516A1 (de) | 2002-04-18 |
DE50104900D1 (de) | 2005-01-27 |
JP2004509273A (ja) | 2004-03-25 |
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