WO2013170981A1 - Metering system for introducing a reducing agent into an exhaust conduit - Google Patents
Metering system for introducing a reducing agent into an exhaust conduit Download PDFInfo
- Publication number
- WO2013170981A1 WO2013170981A1 PCT/EP2013/055604 EP2013055604W WO2013170981A1 WO 2013170981 A1 WO2013170981 A1 WO 2013170981A1 EP 2013055604 W EP2013055604 W EP 2013055604W WO 2013170981 A1 WO2013170981 A1 WO 2013170981A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- air
- reducing agent
- line
- fresh gas
- exhaust
- Prior art date
Links
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 43
- 238000002485 combustion reaction Methods 0.000 claims abstract description 39
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 10
- WTHDKMILWLGDKL-UHFFFAOYSA-N urea;hydrate Chemical compound O.NC(N)=O WTHDKMILWLGDKL-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 54
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 241001124569 Lycaenidae Species 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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
- F01N3/2066—Selective catalytic reduction [SCR]
-
- 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
- F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
- F01N2610/085—Controlling the air supply
-
- 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
Definitions
- the invention relates to a metering system for injecting a reducing agent, in particular a urea-water solution, into an exhaust pipe of a particular supercharged internal combustion engine, the metering having a metering module, the air access for the introduction of air and a Reductant access for the introduction of reducing agent and an opening in the exhaust gas outlet opening, wherein the reducing agent is compressed air assisted introduced into the exhaust pipe and wherein the air access is connected via a line with a fresh gas line of the internal combustion engine. Furthermore, the invention relates to a method for operating such a metering system. State of the art
- Such a metering system is known from WO 2010/1 15487 A1.
- This metering system takes air as compressed air the fresh gas system of an internal combustion engine behind a supercharger of an exhaust gas turbocharger. Since the charge air taken here has a very different pressure depending on the operating point of the internal combustion engine, an air pump is further provided, which is inserted into a connecting line to a two-fluid nozzle for injecting the reducing agent into an exhaust pipe. If the charge air pressure is too low, the air pump increases the pressure of the air fed to the two-component nozzle.
- the compressed air taken from the combustion air system behind the loader of the turbocharger makes itself in normal operation
- the compressed air is taken from a compressed air tank, which is present on a vehicle in which the associated internal combustion engine is installed.
- the compressed air tank is For example, needed for a compressed air brake of the vehicle and by means of a compressor which is driven by the internal combustion engine, filled.
- the invention has for its object to provide a metering system with an air supply for a metering module for introducing a reducing agent in an exhaust pipe of an internal combustion engine, with the fresh air system can be removed without disturbing the combustion air system of the internal combustion engine.
- This object is achieved in that the line for supplying air in the metering module in a region of the fresh gas line downstream of a fresh gas filter and upstream of a supercharger of an exhaust gas turbocharger springs.
- the method according to the invention is characterized in that the air for the introduction of reducing agent into the exhaust gas line of the fresh gas line is taken downstream of a fresh gas filter and upstream of a supercharger of an exhaust gas turbocharger. Accordingly, the method is designed to operate the dosing system. As a result, a second independent filter for the air line is saved, the elimination of this additional filter also saves space. Likewise, when cleaning or replacing the fresh gas filter no additional filter for the air supply to the dosing system must be cleaned or replaced, thereby avoiding additional service and additional costs. In addition, the removal of air in the illustrated region of the fresh gas line upstream of a supercharger of an exhaust gas turbocharger, the air system and in particular the management for controlling and regulating the internal combustion engine in no way disturbed.
- the line of the fresh gas line rises upstream of a hot-film mass meter.
- a hot-film mass meter determines the amount of air passed through, the determined value being used for the control of the internal combustion engine. Due to the fact that the air for the metering system is taken from the fresh gas line in front of this hot film mass meter, there is no distortion of the measured value.
- an air pump is inserted into the line and the line is formed between the fresh gas line and the air pump as an air line and between the air pump and the air access in the dosing as a pressure line.
- the air guided in the fresh gas line already has a pressure which is sufficient for the introduction of reducing agent into the exhaust gas line by means of compressed air. If this is not the case, an air pump is installed in the line for supplying air into the dosing module. This is also an independent of the pressure of the air in the fresh gas line air pressure adjustment of the introduced into the dosing air possible.
- the fresh gas filter has a filter surface which allows the throughput of the air for the combustion air system of the internal combustion engine and for the metering system. If anything, the fresh gas filter must be dimensioned only slightly larger than in a conventionally used fresh gas filter, since such a fresh gas filter usually has a filter surface which is larger than the actual required filter area dimensioned.
- the fresh gas filter has a cleaning device.
- a cleaning device is useful when a vehicle or a machine in which the internal combustion engine and the device according to the invention for injecting a reducing agent is installed in an exhaust pipe, for example, in very dusty and polluted air is exposed in off-road operation. This is the case, for example, with construction vehicles, combine harvesters and so on. In such operations, it may be necessary to remove and clean the fresh gas filter daily. If a corresponding cleaning device is present, this process can be at least partially automated.
- the air pump is designed as a compressor.
- a compressor may for example be designed in the form of a reciprocating compressor and is available in a variety of sizes and designs available.
- the delivery rate of the air pump is adjustable.
- the compressed air provided by the air pump can be easily adapted to the amount of reducing agent to be injected for the purpose of injecting the reducing agent.
- the metering module is attached to the exhaust pipe of the internal combustion engine.
- the reducing agent for frost protection of the metering system can be blown out of the metering module.
- an effective protection of the dosing is ensured against damage, with the amount of bled dosing is low and thus no impairment of the function of the dosing occurs by the direct cultivation of the dosing to the exhaust pipe.
- the reduction agent access of the dosing is connected to a reducing agent tank. From such a reducing agent tank, the reducing agent is fed to the dosing via a delivery module.
- Figure 1 is a schematic diagram of a device installed on an internal combustion engine for injecting a reducing agent into an exhaust pipe of the internal combustion engine.
- FIG. 1 shows an internal combustion engine 1, to the cylinder head of which an intake manifold 2 and an exhaust manifold 3 are mounted.
- the intake manifold 2 is connected to a fresh gas line 4, via which the required for the combustion of injected into the combustion chambers of the internal combustion engine fuel, in particular diesel fuel, the internal combustion engine is supplied.
- the exhaust manifold 3 is connected to an exhaust pipe 5 through which the burned fuel-air mixture is discharged.
- the fresh gas line 4 has on the input side a fresh gas filter 6, are filtered out in the entrained in the air dust and dirt particles.
- a hot-film mass meter. 7 installed, with which the amount of air flowing in the region of the hot-film mass meter 7 can be determined.
- an exhaust-gas turbocharger is installed, the compressor 8 of which compresses the supplied air and further supplies it to a charge-air cooler 9, from which the compressed air passes into the intake manifold 2.
- an exhaust gas recirculation line 10 is provided, which connects the exhaust gas line 5 with the fresh gas line 4.
- an exhaust gas recirculation actuator 1 1 is provided, which is controlled by the control of the internal combustion engine.
- an exhaust gas recirculation cooler 12 is installed in the exhaust gas recirculation line 10 behind the exhaust gas recirculation controller, which reduces the temperature of the recirculated exhaust gas according to specification.
- a turbine 13 of the exhaust gas turbocharger Downstream of the exhaust gas recirculation line 10, a turbine 13 of the exhaust gas turbocharger is installed in the exhaust pipe 5.
- the turbine 13 of the exhaust gas turbocharger is set in rotational motion by the exhaust gases flowing out of the internal combustion engine 1 and drives the compressor 8, which is connected to the turbine 13 via a shaft and compresses the air drawn in from the surroundings.
- the exhaust gas recirculation line 10 may be provided downstream of the exhaust gas turbocharger and there connect the exhaust pipe 5 with the fresh gas line 4.
- a metering module 14 with a nozzle opening 15 designed as an outlet opening is built into the exhaust pipe 5, wherein the reducing agent 15 is introduced and injected into the exhaust pipe 5 by compressed air assisted by the nozzle.
- the reducing agent causes in a subsequent catalyst 16, in particular an SCR catalyst for a selective catalytic reduction, desired chemical reactions, namely a reduction of NOx.
- the exhaust gas thus treated is finally supplied to further cleaning devices, such as a particulate filter, or discharged directly into the environment.
- the reducing agent injected into the exhaust gas line 5 via the metering module 14 and the nozzle 15 is removed from a delivery module 18 by a reducing agent tank 17 and introduced into the metering module 14 in a controlled manner via a reducing agent access.
- the metering module 14 is supplied via an air inlet from a pressure air line 19 compressed air, which is compressed by an air pump 20.
- the air supplied to the air pump 20 of the fresh gas line 4 in the region downstream of the fresh gas filter 6 and upstream of the optional hot-film masses knife is removed via an air line 21.
- reducing agent is finely atomized injected through the nozzle 15 into the exhaust pipe 5.
- the amount of reducing agent atomized in the metering module 14 is adjustable, as is the amount of compressed air supplied. To ensure ice pressure safety, the quantity of dosing agent present in dosing module 14 when the internal combustion engine 1 is shut down can be blown out by compressed air.
Abstract
The invention relates to a metering system for introducing a reducing agent, in particular a urea-water solution, into an exhaust conduit (5) of a fully loaded internal combustion engine (1), the metering system having a metering module (14) which has an air inlet for letting in air and a reducing agent inlet for letting in reducing agent as well as an outlet opening which leads into the exhaust conduit (5), the reducing agent being introduced into the exhaust conduit via the outlet opening with the support of compressed air, the air inlet being connected via a conduit (19, 21) to a fresh gas conduit (4) of the internal combustion engine (1). An air supply is provided for a metering system in order to introduce a reducing agent into an exhaust conduit (5), and enables air to be extracted from the fresh gas system of the internal combustion engine (1) without disrupting the combustion air system of an internal combustion engine (1). This is achieved by ensuring that the conduit (19, 21) leads into the fresh gas conduit (4) in a region located downstream of a fresh gas filter (6) and upstream of a charger (8) of an exhaust gas turbocharger.
Description
Beschreibung description
Titel: Title:
Dosiersystem zur Eindüsung eines Reduktionsmittels in eine Abgasleitung Der Erfindung betrifft ein Dosiersystem zur Eindüsung eines Reduktionsmittels, insbesondere einer Harnstoff-Wasser-Lösung, in eine Abgasleitung einer insbesondere aufgeladenen Brennkraftmaschine, wobei das Dosiersystem ein Dosiermodul aufweist, das einen Luftzugang zur Einleitung von Luft und einen Reduktionsmittelzugang zur Einleitung von Reduktionsmittel sowie eine in die Abgasleitung einmündende Aus- gangsoffnung aufweist, wobei das Reduktionsmittel druckluftunterstützt in die Abgasleitung eingebracht wird und wobei der Luftzugang über eine Leitung mit einer Frischgasleitung der Brennkraftmaschine verbunden ist. Weiterhin betrifft die Erfindung ein Verfahren zum Betreiben eines solchen Dosiersystems. Stand der Technik The invention relates to a metering system for injecting a reducing agent, in particular a urea-water solution, into an exhaust pipe of a particular supercharged internal combustion engine, the metering having a metering module, the air access for the introduction of air and a Reductant access for the introduction of reducing agent and an opening in the exhaust gas outlet opening, wherein the reducing agent is compressed air assisted introduced into the exhaust pipe and wherein the air access is connected via a line with a fresh gas line of the internal combustion engine. Furthermore, the invention relates to a method for operating such a metering system. State of the art
Ein derartiges Dosiersystem ist aus der WO 2010/1 15487 A1 bekannt. Dieses Dosiersystem entnimmt Luft als Druckluft dem Frischgassystem einer Brennkraftmaschine hinter einem Lader eines Abgasturboladers. Da die hier entnommene Ladedruckluft je nach Betriebspunkt der Brennkraftmaschine einen sehr unterschiedlichen Druck aufweist, ist ferner eine Luftpumpe vorgesehen, die in eine Verbindungsleitung zu einer Zweistoffdüse zur Eindüsung des Reduktionsmittels in eine Abgasleitung eingesetzt ist. Die Luftpumpe erhöht bei zu niedrigem Ladeluftdruck den Druck der der Zweistoffdüse zugeführten Luft. Die dem Verbrennungsluftsystem hinter dem Lader des Abgasturbo- laders entnommene Druckluft macht sich darüberhinaus im normalen Betrieb derSuch a metering system is known from WO 2010/1 15487 A1. This metering system takes air as compressed air the fresh gas system of an internal combustion engine behind a supercharger of an exhaust gas turbocharger. Since the charge air taken here has a very different pressure depending on the operating point of the internal combustion engine, an air pump is further provided, which is inserted into a connecting line to a two-fluid nozzle for injecting the reducing agent into an exhaust pipe. If the charge air pressure is too low, the air pump increases the pressure of the air fed to the two-component nozzle. In addition, the compressed air taken from the combustion air system behind the loader of the turbocharger makes itself in normal operation
Brennkraftmaschine negativ bemerkbar, da das Steuermanagement der Brennkraftmaschine durch die Entnahme von Luft an dieser Stelle gestört wird. Internal combustion engine negatively noticeable, since the control management of the internal combustion engine is disturbed by the removal of air at this point.
Ein weiteres Dosiersystem zur Eindüsung eines Reduktionsmittels ist aus der DE 199 46 900 A1 bekannt. Auch diese Vorrichtung benutzt Druckluft zur Eindüsung von demAnother metering system for the injection of a reducing agent is known from DE 199 46 900 A1. This device also uses compressed air for the injection of the
Reduktionsmittel in die Abgasleitung einer Brennkraftmaschine. Hierbei wird die Druckluft aus einem Druckluftbehälter entnommen, der an einem Fahrzeug, in dem die zugehörige Brennkraftmaschine verbaut ist, vorhanden ist. der Druckluftbehälter wird bei-
spielsweise für eine Druckluftbremse des Fahrzeugs benötigt und mittels eines Kompressors, der von der Brennkraftmaschine angetrieben wird, befüllt. Reducing agent in the exhaust pipe of an internal combustion engine. Here, the compressed air is taken from a compressed air tank, which is present on a vehicle in which the associated internal combustion engine is installed. the compressed air tank is For example, needed for a compressed air brake of the vehicle and by means of a compressor which is driven by the internal combustion engine, filled.
Der Erfindung liegt die Aufgabe zugrunde, ein Dosiersystem mit einer Luftversorgung für ein Dosiermodul zur Einbringung eines Reduktionsmittels in eine Abgasleitung einer Brennkraftmaschine bereitzustellen, mit dem ohne Störung des Verbrennungsluftsystems der Brennkraftmaschine einem Frischgassystem Luft entnehmbar ist. The invention has for its object to provide a metering system with an air supply for a metering module for introducing a reducing agent in an exhaust pipe of an internal combustion engine, with the fresh air system can be removed without disturbing the combustion air system of the internal combustion engine.
Offenbarung der Erfindung Disclosure of the invention
Vorteile der Erfindung Advantages of the invention
Diese Aufgabe wird dadurch gelöst, dass die Leitung zur Zuführung von Luft in das Dosiermodul in einem Bereich der Frischgasleitung stromabwärts eines Frischgasfilters und stromaufwärts eines Laders eines Abgasturboladers entspringt. This object is achieved in that the line for supplying air in the metering module in a region of the fresh gas line downstream of a fresh gas filter and upstream of a supercharger of an exhaust gas turbocharger springs.
Das erfindungsgemäße Verfahren zeichnet sich dadurch aus, dass die Luft zur Eindü- sung von Reduktionsmittel in die Abgasleitung der Frischgasleitung stromabwärts eines Frischgasfilters und stromaufwärts eines Laders eines Abgasturboladers entnommen wird. Entsprechend ist das Verfahren zum Betreiben des Dosiersystems ausgelegt. Hierdurch wird ein zweiter eigenständiger Filter für die Luftleitung eingespart, wobei der Entfall dieses zusätzlichen Filters darüber hinaus Bauraum spart. Ebenso muss bei einer Reinigung oder einem Tausch des Frischgasfilters kein zusätzlicher Filter für die Luftversorgung des Dosiersystems gereinigt oder getauscht werden, wodurch zusätzlicher Serviceaufwand und zusätzliche Kosten vermieden werden. Darüber hinaus wird durch die Entnahme von Luft in dem dargestellten Bereich der Frischgasleitung stromaufwärts eines Laders eines Abgasturboladers das Luftsystem und insbesondere das Management zur Steuerung und Regelung der Brennkraftmaschine in keiner Weise gestört. The method according to the invention is characterized in that the air for the introduction of reducing agent into the exhaust gas line of the fresh gas line is taken downstream of a fresh gas filter and upstream of a supercharger of an exhaust gas turbocharger. Accordingly, the method is designed to operate the dosing system. As a result, a second independent filter for the air line is saved, the elimination of this additional filter also saves space. Likewise, when cleaning or replacing the fresh gas filter no additional filter for the air supply to the dosing system must be cleaned or replaced, thereby avoiding additional service and additional costs. In addition, the removal of air in the illustrated region of the fresh gas line upstream of a supercharger of an exhaust gas turbocharger, the air system and in particular the management for controlling and regulating the internal combustion engine in no way disturbed.
In Weiterbildung der Erfindung entspringt die Leitung der Frischgasleitung stromaufwärts eines Heißfilm-Massenmessers. Ein solcher Heißfilm-Massenmesser ermittelt die durchgesetzte Luftmenge, wobei der ermittelte Wert für die Steuerung der Brennkraftmaschine herangezogen wird. Dadurch, dass die Luft für das Dosiersystem vor diesem Heißfilm-Massenmesser der Frischgasleitung entnommen wird, ist keine Verfälschung des gemessenen Wertes gegeben.
In weiterer Ausgestaltung ist in die Leitung eine Luftpumpe eingesetzt ist und die Leitung ist zwischen der Frischgasleitung und der Luftpumpe als Luftleitung und zwischen der Luftpumpe und dem Luftzugang in das Dosiermodul als Druckleitung ausgebildet. Grundsätzlich ist es denkbar, dass schon die in der Frischgasleitung geführte Luft ei- nen Druck aufweist, der zur druckluftunterstützten Einbringung von Reduktionsmittel in die Abgasleitung ausreicht. Falls dies aber nicht der Fall ist, ist eine Luftpumpe in die Leitung zur Zuführung von Luft in das Dosiermodul eingebaut. Damit ist auch eine unabhängig von dem Druck der Luft in der Frischgasleitung Luftdruckeinstellung der in das Dosiermodul eingebrachten Luft möglich. In a further development of the invention, the line of the fresh gas line rises upstream of a hot-film mass meter. Such a hot-film mass meter determines the amount of air passed through, the determined value being used for the control of the internal combustion engine. Due to the fact that the air for the metering system is taken from the fresh gas line in front of this hot film mass meter, there is no distortion of the measured value. In a further embodiment, an air pump is inserted into the line and the line is formed between the fresh gas line and the air pump as an air line and between the air pump and the air access in the dosing as a pressure line. In principle, it is conceivable that the air guided in the fresh gas line already has a pressure which is sufficient for the introduction of reducing agent into the exhaust gas line by means of compressed air. If this is not the case, an air pump is installed in the line for supplying air into the dosing module. This is also an independent of the pressure of the air in the fresh gas line air pressure adjustment of the introduced into the dosing air possible.
In weiterer Ausgestaltung der Erfindung weist der Frischgasfilter eine Filterfläche auf, die den Durchsatz der Luft für das Verbrennungsluftsystem der Brennkraftmaschine und für das Dosiersystem ermöglicht. Falls überhaupt, muss der Frischgasfilter nur geringfügig größer als bei einem herkömmlich eingesetzten Frischgasfilter dimensioniert werden, da ein solcher Frischgasfilter in der Regel eine Filterfläche aufweist, die größer als die tatsächlich notwendige Filterfläche dimensioniert ist. In a further embodiment of the invention, the fresh gas filter has a filter surface which allows the throughput of the air for the combustion air system of the internal combustion engine and for the metering system. If anything, the fresh gas filter must be dimensioned only slightly larger than in a conventionally used fresh gas filter, since such a fresh gas filter usually has a filter surface which is larger than the actual required filter area dimensioned.
In Weiterbildung der Erfindung weist der Frischgasfilter eine Reinigungsvorrichtung auf. Eine solche Reinigungsvorrichtung ist dann sinnvoll, wenn ein Fahrzeug oder eine Ma- schine, in der die Brennkraftmaschine und die erfindungsgemäße Vorrichtung zur Ein- düsung eines Reduktionsmittels in einer Abgasleitung eingebaut ist, beispielsweise im Off-Road betrieb sehr staubiger und verschmutzter Luft ausgesetzt ist. Dies ist beispielsweise bei Baustellenfahrzeugen, Mähdreschern und so weiter der Fall. Bei solchen Einsätzen ist es unter Umständen erforderlich, den Frischgasfilter täglich auszu- bauen und zu reinigen. Ist eine entsprechende Reinigungsvorrichtung vorhanden, kann dieser Vorgang zumindest teilweise automatisiert werden. In a further development of the invention, the fresh gas filter has a cleaning device. Such a cleaning device is useful when a vehicle or a machine in which the internal combustion engine and the device according to the invention for injecting a reducing agent is installed in an exhaust pipe, for example, in very dusty and polluted air is exposed in off-road operation. This is the case, for example, with construction vehicles, combine harvesters and so on. In such operations, it may be necessary to remove and clean the fresh gas filter daily. If a corresponding cleaning device is present, this process can be at least partially automated.
In Weiterbildung der Erfindung ist die Luftpumpe als Kompressor ausgebildet. Ein solcher Kompressor kann beispielsweise in Form eines Kolbenkompressors ausgebildet sein und steht in vielfältigen Baugrößen und Bauausführungen zur Verfügung. In a further development of the invention, the air pump is designed as a compressor. Such a compressor may for example be designed in the form of a reciprocating compressor and is available in a variety of sizes and designs available.
In weiterer Ausgestaltung der Erfindung ist die Förderleistung der Luftpumpe einstellbar. Dadurch kann die von der Luftpumpe bereitgestellte Druckluft zur Eindüsung des Reduktionsmittels an die Menge des einzudüsenden Reduktionsmittels problemlos an- gepasst werden. In a further embodiment of the invention, the delivery rate of the air pump is adjustable. As a result, the compressed air provided by the air pump can be easily adapted to the amount of reducing agent to be injected for the purpose of injecting the reducing agent.
In weiterer Ausgestaltung der Erfindung ist das Dosiermodul an die Abgasleitung der Brennkraftmaschine angebaut. Ein solcher Anbau erspart einerseits einen eigenständi-
gen Halter für das Dosiermodul und stellt andererseits sicher, dass das fein zerstäubte Dosiermittel direkt am Ort der Eindüsung in die Abgasleitung erzeugt wird. In a further embodiment of the invention, the metering module is attached to the exhaust pipe of the internal combustion engine. Such an extension saves on the one hand an independent gene holder for the dosing and on the other hand ensures that the finely atomized dosing is generated directly at the place of injection into the exhaust pipe.
In Weiterbildung der Erfindung ist das Reduktionsmittel für einen Frostschutz des Dosiersystems aus dem Dosiermodul ausblasbar. Dadurch ist ein wirkungsvoller Schutz des Dosiermoduls gegen Beschädigungen sichergestellt, wobei durch den direkten Anbau des Dosiermoduls an die Abgasleitung die Menge des auszublasenden Dosiermittels gering ist und somit keine Beeinträchtigung der Funktion des Dosiersystems eintritt. In a development of the invention, the reducing agent for frost protection of the metering system can be blown out of the metering module. As a result, an effective protection of the dosing is ensured against damage, with the amount of bled dosing is low and thus no impairment of the function of the dosing occurs by the direct cultivation of the dosing to the exhaust pipe.
In weiterer Ausgestaltung der Erfindung ist der Reduktionmittelzugang des Dosiermoduls mit einem Reduktionsmitteltank verbunden. Aus einem solchen Reduktionmitteltank wird über ein Fördermodul das Reduktionsmittel dem Dosiermodul zugeführt. In a further embodiment of the invention, the reduction agent access of the dosing is connected to a reducing agent tank. From such a reducing agent tank, the reducing agent is fed to the dosing via a delivery module.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind der Zeichnungsbeschreibung zu entnehmen, in der ein in der Figur dargestelltes Ausführungsbeispiel der Erfindung näher beschrieben ist. Further advantageous embodiments of the invention are described in the drawings, in which an illustrated in the figure embodiment of the invention is described in detail.
Kurze Beschreibung der Zeichnung Short description of the drawing
Es zeigt: It shows:
Figur 1 eine Prinzipskizze einer an einer Brennkraftmaschine verbauten Vorrichtung zur Eindüsung eines Reduktionsmittel in eine Abgasleitung der Brennkraftmaschine. Figure 1 is a schematic diagram of a device installed on an internal combustion engine for injecting a reducing agent into an exhaust pipe of the internal combustion engine.
Ausführungsform der Erfindung Embodiment of the invention
Figur 1 zeigt eine Brennkraftmaschine 1 , an deren Zylinderkopf ein Ansaugkrümmer 2 und ein Abgaskrümmer 3 angebaut sind. Der Ansaugkrümmer 2 ist mit einer Frischgasleitung 4 verbunden, über die die für die Verbrennung von in die Brennräume der Brennkraftmaschine eingespritzten Kraftstoff, insbesondere Dieselkraftstoff, benötigte Luft der Brennkraftmaschine zugeführt wird. Der Abgaskrümmer 3 ist mit einer Abgasleitung 5 verbunden, über die das verbrannte Kraftstoff-Luft-Gemisch abgeleitet wird. FIG. 1 shows an internal combustion engine 1, to the cylinder head of which an intake manifold 2 and an exhaust manifold 3 are mounted. The intake manifold 2 is connected to a fresh gas line 4, via which the required for the combustion of injected into the combustion chambers of the internal combustion engine fuel, in particular diesel fuel, the internal combustion engine is supplied. The exhaust manifold 3 is connected to an exhaust pipe 5 through which the burned fuel-air mixture is discharged.
Die Frischgasleitung 4 weist eingangsseitig einen Frischgasfilter 6 auf, in dem in der Luft mitgeführter Staub und Schmutzpartikel ausgefiltert werden. In die Frischgasleitung ist stromabwärts des Frischgasfilters 6 optional ein Heißfilm-Massenmesser 7
eingebaut, mit dem die in dem Bereich des Heißfilm-Massenmessers 7 strömende Luftmenge bestimmt werden kann. Weiter stromabwärts des Heißfilm-Massenmessers 7 ist ein Abgasturbolader verbaut, dessen Verdichter 8 die zugeführte Luft verdichtet und weiter einem Ladeluftkühler 9 zuführt, von dem aus die verdichtete Luft in dem An- saugkrümmer 2 gelangt. The fresh gas line 4 has on the input side a fresh gas filter 6, are filtered out in the entrained in the air dust and dirt particles. In the fresh gas line is downstream of the fresh gas filter 6 optionally a hot-film mass meter. 7 installed, with which the amount of air flowing in the region of the hot-film mass meter 7 can be determined. Further downstream of the hot-film mass meter 7, an exhaust-gas turbocharger is installed, the compressor 8 of which compresses the supplied air and further supplies it to a charge-air cooler 9, from which the compressed air passes into the intake manifold 2.
Direkt stromabwärts des Abgaskrümmers 3 ist eine Abgasrückführleitung 10 vorgesehen, die die Abgasleitung 5 mit der Frischgasleitung 4 verbindet. Zur Steuerung der in die Frischgasleitung 4 hinter dem Ladeluftkühler 9 zurückgeführten Abgasmenge ist ein Abgasrückführsteller 1 1 vorgesehen, der von der Steuerung der Brennkraftmaschine angesteuert wird. Weiterhin ist in die Abgasrückführleitung 10 hinter dem Abgasrückführsteller ein Abgasrückführkühler 12 eingebaut, der die Temperatur des zurückgeführten Abgases nach Vorgabe reduziert. Directly downstream of the exhaust manifold 3, an exhaust gas recirculation line 10 is provided, which connects the exhaust gas line 5 with the fresh gas line 4. For controlling the recirculated into the fresh gas line 4 behind the intercooler 9 exhaust gas amount, an exhaust gas recirculation actuator 1 1 is provided, which is controlled by the control of the internal combustion engine. Furthermore, an exhaust gas recirculation cooler 12 is installed in the exhaust gas recirculation line 10 behind the exhaust gas recirculation controller, which reduces the temperature of the recirculated exhaust gas according to specification.
Stromabwärts der Abgasrückführleitung 10 ist eine Turbine 13 des Abgasturboladers in die Abgasleitung 5 eingebaut. Die Turbine 13 des Abgasturboladers wird von den aus der Brennkraftmaschine 1 ausströmenden Abgasen in Drehbewegung versetzt und treibt den mit der Turbine 13 über eine Welle verbundenen Verdichter 8 an, der die aus der Umgebung angesaugte Luft verdichtet. Downstream of the exhaust gas recirculation line 10, a turbine 13 of the exhaust gas turbocharger is installed in the exhaust pipe 5. The turbine 13 of the exhaust gas turbocharger is set in rotational motion by the exhaust gases flowing out of the internal combustion engine 1 and drives the compressor 8, which is connected to the turbine 13 via a shaft and compresses the air drawn in from the surroundings.
Optional zu dem Einbau der Abgasrückführleitung 10 direkt hinter dem Abgaskrümmer 3 und dem Ansaugkrümmer 2 kann die Abgasrückführleitung 10 auch stromabwärts des Abgasturboladers vorgesehen sein und dort die Abgasleitung 5 mit der Frischgasleitung 4 verbinden. Optionally to the installation of the exhaust gas recirculation line 10 directly behind the exhaust manifold 3 and the intake manifold 2, the exhaust gas recirculation line 10 may be provided downstream of the exhaust gas turbocharger and there connect the exhaust pipe 5 with the fresh gas line 4.
Weiter stromabwärts ist in die Abgasleitung 5 ein Dosiermodul 14 mit einer als Düse 15 ausgebildeten Ausgangsöffnung eingebaut, wobei durch die Düse 15 Reduktionsmittel druckluftunterstützt in die Abgasleitung 5 eingebracht beziehungsweise eingedüst wird. Das Reduktionmittel bewirkt in einem nachfolgenden Katalysator 16, insbesondere einem SCR-Katalysator für eine selektive katalytische Reduktion, gewünschte chemische Reaktionen, nämlich eine Reduzierung von NOx. Das so behandelte Abgas wird abschließend weiteren Reinigungsvorrichtungen, beispielsweise einem Partikelfilter zugeführt, oder aber direkt in die Umgebung abgeleitet. Das über das Dosiermodul 14 und die Düse 15 in die Abgasleitung 5 eingedüste Reduktionsmittel wird einem Reduktionsmitteltank 17 von einem Fördermodul 18 entnommen und gesteuert über einen Reduktionsmittelzugang in das Dosiermodul 14 eingeleitet. Gleichzeitig wird über einen Luftzugang dem Dosiermodul 14 von einer Druck-
luftleitung 19 Druckluft zugeführt, die von einer Luftpumpe 20 verdichtet wird. Die der Luftpumpe 20 zugeführte Luft wird der Frischgasleitung 4 im Bereich stromabwärts des Frischgasfilters 6 und stromaufwärts des optional vorhandenen Heißfilm- Massen messers über eine Luftleitung 21 entnommen. Mit Hilfe der Druckluft wird das in das Dosiermodul 14 eingeführte Reduktionsmittel fein zerstäubt durch die Düse 15 in die Abgasleitung 5 eingedüst. Die in dem Dosiermodul 14 zerstäubte Menge von Reduktionsmittel ist ebenso wie die zugeführte Druckluftmenge einstellbar. Zur Gewährleistung einer Eisdrucksicherheit ist die in dem Dosiermodul 14 bei einer Außerbetriebsetzung der Brennkraftmaschine 1 befindliche Menge an Dosiermittel durch Druckluft ausblasbar.
Farther downstream, a metering module 14 with a nozzle opening 15 designed as an outlet opening is built into the exhaust pipe 5, wherein the reducing agent 15 is introduced and injected into the exhaust pipe 5 by compressed air assisted by the nozzle. The reducing agent causes in a subsequent catalyst 16, in particular an SCR catalyst for a selective catalytic reduction, desired chemical reactions, namely a reduction of NOx. The exhaust gas thus treated is finally supplied to further cleaning devices, such as a particulate filter, or discharged directly into the environment. The reducing agent injected into the exhaust gas line 5 via the metering module 14 and the nozzle 15 is removed from a delivery module 18 by a reducing agent tank 17 and introduced into the metering module 14 in a controlled manner via a reducing agent access. At the same time, the metering module 14 is supplied via an air inlet from a pressure air line 19 compressed air, which is compressed by an air pump 20. The air supplied to the air pump 20 of the fresh gas line 4 in the region downstream of the fresh gas filter 6 and upstream of the optional hot-film masses knife is removed via an air line 21. With the help of compressed air introduced into the metering module 14 reducing agent is finely atomized injected through the nozzle 15 into the exhaust pipe 5. The amount of reducing agent atomized in the metering module 14 is adjustable, as is the amount of compressed air supplied. To ensure ice pressure safety, the quantity of dosing agent present in dosing module 14 when the internal combustion engine 1 is shut down can be blown out by compressed air.
Claims
Dosiersystem zur Eindüsung eines Reduktionsmittels, insbesondere einer Harnstoff-Wasser-Lösung, in eine Abgasleitung (5) einer Brennkraftmaschine (1 ), wobei das Dosiersystem ein Dosiermodul (14) aufweist, das einen Luftzugang zur Einleitung von Luft und einen Reduktionsmittelzugang zur Einleitung von Reduktionsmittel sowie eine in die Abgasleitung (5) einmündende Ausgangsöffnung aufweist, wobei das Reduktionsmittel druckluftunterstützt durch die Ausgangsöffnung in die Abgasleitung eingebracht wird, und wobei der Luftzugang über eine Leitung mit einer Frischgasleitung (4) der Brennkraftmaschine (1 ) verbunden ist, Dosing system for injecting a reducing agent, in particular a urea-water solution, into an exhaust line (5) of an internal combustion engine (1), the dosing system having a dosing module (14) which has an air access for introducing air and a reducing agent access for introducing reducing agent and an outlet opening opening into the exhaust line (5), the reducing agent being introduced into the exhaust line through the outlet opening with the aid of compressed air, and the air access being connected via a line to a fresh gas line (4) of the internal combustion engine (1),
dadurch gekennzeichnet, dass die Leitung der Frischgasleitung (4) in einem Bereich stromabwärts eines Frischgasfilters (6) und stromaufwärts eines Laders (8) eines Abgasturboladers entspringt. characterized in that the line of the fresh gas line (4) originates in an area downstream of a fresh gas filter (6) and upstream of a charger (8) of an exhaust gas turbocharger.
Dosiersystem nach Anspruch 1 , Dosing system according to claim 1,
dadurch gekennzeichnet, dass die Leitung der Frischgasleitung (4) stromaufwärts eines Heißfilm-Massenmessers (7) entspringt. characterized in that the line of the fresh gas line (4) originates upstream of a hot film mass meter (7).
Dosiersystem nach einem der vorherigen Ansprüche, Dosing system according to one of the previous claims,
dadurch gekennzeichnet, dass in die Leitung eine Luftpumpe (20) eingesetzt ist und dass die Leitung zwischen der Frischgasleitung characterized in that an air pump (20) is inserted into the line and that the line is between the fresh gas line
(4) und der Luftpumpe (20) als Luftleitung (21 ) und zwischen der Luftpumpe (20) und dem Luftzugang in das Dosiermodul (14) als Druckleitung (21 ) ausgebildet ist. (4) and the air pump (20) as an air line (21) and between the air pump (20) and the air access into the dosing module (14) as a pressure line (21).
Dosiersystem nach einem der vorherigen Ansprüche, Dosing system according to one of the previous claims,
dadurch gekennzeichnet, dass der Frischgasfilter (6) eine Filterfläche aufweist, die den Durchsatz der Luft für das Verbrennungsluftsystem und für das Dosiersystem ermöglicht. characterized in that the fresh gas filter (6) has a filter surface which enables the throughput of air for the combustion air system and for the metering system.
5. Dosiersystem nach Anspruch 3, 5. Dosing system according to claim 3,
dadurch gekennzeichnet, dass der Frischgasfilter (6) eine Reinigungsvorrichtung aufweist.
characterized in that the fresh gas filter (6) has a cleaning device.
6. Dosiersystem nach einem der vorherigen Ansprüche, 6. Dosing system according to one of the previous claims,
dadurch gekennzeichnet, dass die Luftpumpe (20) ein Kompressor ist. characterized in that the air pump (20) is a compressor.
7. Dosiersystem nach einer der vorherigen Ansprüche, 7. Dosing system according to one of the previous claims,
dadurch gekennzeichnet, dass die Förderleistung der Luftpumpe (20) einstellbar ist. characterized in that the delivery rate of the air pump (20) is adjustable.
8. Dosiersystem nach einem der vorherigen Ansprüche, 8. Dosing system according to one of the preceding claims,
dadurch gekennzeichnet, dass das Dosiermodul (14) an die Abgasleitung (5) angebaut ist. characterized in that the metering module (14) is attached to the exhaust pipe (5).
9. Dosiersystem nach einem der vorherigen Ansprüche, 9. Dosing system according to one of the previous claims,
dadurch gekennzeichnet, dass das Reduktionsmittel für einen Frostschutz des Dosiersystems aus dem Dosiermodul (14) ausblasbar ist. characterized in that the reducing agent can be blown out of the dosing module (14) to protect the dosing system from frost.
10. Dosiersystem nach einem der vorherigen Ansprüche, 10. Dosing system according to one of the previous claims,
dadurch gekennzeichnet, dass der Reduktionsmittelzugang des Dosiermoduls (14) mit einem Reduktionsmitteltank (17) verbunden ist. characterized in that the reducing agent access of the dosing module (14) is connected to a reducing agent tank (17).
1 1 . Verfahren zum Betreiben eines Dosiersystems zur Eindüsung eines Reduktionsmittels, insbesondere einer Harnstoff-Wasser-Lösung, in eine Abgasleitung (5) einer Brennkraftmaschine (1 ), wobei das Dosiersystem ein Dosiermodul (14) aufweist, das einen Luftzugang zur Einleitung von Luft und einen Reduktionsmittelzugang zur Einleitung von Reduktionsmittel sowie eine in die Abgasleitung (5) einmündende Ausgangsöffnung aufweist, wobei das Reduktionsmittel druckluftunterstützt durch die Ausgangsöffnung in die Abgasleitung eingebracht wird, und wobei der Luftzugang über eine Leitung mit einer Frischgasleitung (4) der Brennkraftmaschine (1 ) verbunden ist, 1 1 . Method for operating a metering system for injecting a reducing agent, in particular a urea-water solution, into an exhaust line (5) of an internal combustion engine (1), the metering system having a metering module (14) which has an air access for introducing air and a reducing agent access for introducing reducing agent and an outlet opening opening into the exhaust line (5), the reducing agent being introduced into the exhaust line through the outlet opening with the aid of compressed air, and the air access being connected via a line to a fresh gas line (4) of the internal combustion engine (1),
dadurch gekennzeichnet, dass die Luft zur Einbringung von Reduktionsmittel in die Abgasleitung (5) der Frischgasleitung (4) stromabwärts eines Frischgasfilters (6) und stromaufwärts eines Laders (8) eines Abgasturboladers entnommen wird. characterized in that the air for introducing reducing agent into the exhaust line (5) of the fresh gas line (4) is taken downstream of a fresh gas filter (6) and upstream of a charger (8) of an exhaust gas turbocharger.
12. Verfahren nach Anspruch 1 1 , 12. The method according to claim 1 1,
dadurch gekennzeichnet, dass der Luftstrom stromaufwärts eines Heißfilm- Massen messers (7) entnommen wird.
characterized in that the air flow is taken upstream of a hot film mass knife (7).
Applications Claiming Priority (2)
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DE102012208367.7 | 2012-05-18 | ||
DE102012208367A DE102012208367A1 (en) | 2012-05-18 | 2012-05-18 | Dosing system for injecting a reducing agent into an exhaust pipe |
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WO2013170981A1 true WO2013170981A1 (en) | 2013-11-21 |
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PCT/EP2013/055604 WO2013170981A1 (en) | 2012-05-18 | 2013-03-19 | Metering system for introducing a reducing agent into an exhaust conduit |
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DE (1) | DE102012208367A1 (en) |
WO (1) | WO2013170981A1 (en) |
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CH711661A1 (en) * | 2015-10-15 | 2017-04-28 | Liebherr Machines Bulle Sa | Device for exhaust aftertreatment. |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19859201A1 (en) * | 1998-12-21 | 2000-06-29 | Siemens Ag | Method and device for the selective catalytic reduction of nitrogen oxides in oxygen-containing exhaust gases |
DE19946900A1 (en) | 1999-06-22 | 2000-12-28 | Bosch Gmbh Robert | Complex system dosing and mixing urea and air, used for nitrogen oxide conversion in vehicle exhaust purification systems, is integrated into or onto single plastic or metal block |
US20050011184A1 (en) * | 2003-06-30 | 2005-01-20 | Price Kenneth S. | Method and apparatus for delivery of supplemental material to an exhaust gas feedstream with supplemental air assistance |
FR2918901A3 (en) * | 2007-07-18 | 2009-01-23 | Renault Sas | Compound e.g. aldehyde compound, producing system for drive train of motor vehicle, has container connected to ozone production device, and pipe connected to pump in manner to introduce air-ozone mixture in form of gas into container |
WO2010115487A1 (en) | 2009-04-09 | 2010-10-14 | Albonair Gmbh | Metering system for injecting a reducing agent into the exhaust gas flow of an internal combustion engine |
-
2012
- 2012-05-18 DE DE102012208367A patent/DE102012208367A1/en not_active Withdrawn
-
2013
- 2013-03-19 WO PCT/EP2013/055604 patent/WO2013170981A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19859201A1 (en) * | 1998-12-21 | 2000-06-29 | Siemens Ag | Method and device for the selective catalytic reduction of nitrogen oxides in oxygen-containing exhaust gases |
DE19946900A1 (en) | 1999-06-22 | 2000-12-28 | Bosch Gmbh Robert | Complex system dosing and mixing urea and air, used for nitrogen oxide conversion in vehicle exhaust purification systems, is integrated into or onto single plastic or metal block |
US20050011184A1 (en) * | 2003-06-30 | 2005-01-20 | Price Kenneth S. | Method and apparatus for delivery of supplemental material to an exhaust gas feedstream with supplemental air assistance |
FR2918901A3 (en) * | 2007-07-18 | 2009-01-23 | Renault Sas | Compound e.g. aldehyde compound, producing system for drive train of motor vehicle, has container connected to ozone production device, and pipe connected to pump in manner to introduce air-ozone mixture in form of gas into container |
WO2010115487A1 (en) | 2009-04-09 | 2010-10-14 | Albonair Gmbh | Metering system for injecting a reducing agent into the exhaust gas flow of an internal combustion engine |
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