DE202009012592U1 - Exhaust treatment plant of diesel engines - Google Patents
Exhaust treatment plant of diesel engines Download PDFInfo
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- DE202009012592U1 DE202009012592U1 DE202009012592U DE202009012592U DE202009012592U1 DE 202009012592 U1 DE202009012592 U1 DE 202009012592U1 DE 202009012592 U DE202009012592 U DE 202009012592U DE 202009012592 U DE202009012592 U DE 202009012592U DE 202009012592 U1 DE202009012592 U1 DE 202009012592U1
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- diesel
- exhaust gas
- treatment plant
- oxidation catalyst
- particulate filter
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- 230000003647 oxidation Effects 0.000 claims abstract description 40
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 40
- 239000003054 catalyst Substances 0.000 claims abstract description 38
- 239000004071 soot Substances 0.000 claims abstract description 19
- 239000002283 diesel fuel Substances 0.000 claims abstract description 15
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 11
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 11
- 239000002245 particle Substances 0.000 claims abstract description 11
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 11
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 229910010293 ceramic material Inorganic materials 0.000 claims description 9
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 8
- 239000000446 fuel Substances 0.000 claims description 6
- 229910052697 platinum Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 3
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 28
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 101100004280 Caenorhabditis elegans best-2 gene Proteins 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
- F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
-
- 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
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
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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
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
- F01N3/0222—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous the structure being monolithic, e.g. honeycombs
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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
- F01N3/103—Oxidation catalysts for HC and CO only
-
- 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
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
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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
- F01N9/00—Electrical control of exhaust gas treating apparatus
- F01N9/002—Electrical control of exhaust gas treating apparatus of filter regeneration, e.g. detection of clogging
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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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
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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
- F01N2560/00—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics
- F01N2560/08—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a pressure sensor
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
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- 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
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- 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
- Y02T10/40—Engine management systems
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Materials Engineering (AREA)
- Processes For Solid Components From Exhaust (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Abgasbehandlungsanlage von Dieselmotoren, mit einem Dieseloxidationskatalysator (2), mittels dem der Gehalt des Abgasstroms (4) des Dieselmotors an Kohlenwasserstoffen und an Kohlenmonoxid reduzierbar ist, und einem Dieselrußpartikelfilter (3), der stromab des Dieseloxidationskatalysators (2) in der Abgasbehandlungsanlage (1) angeordnet ist, mittels dem Dieselrußpartikel aus dem Abgasstrom (4) des Dieselmotors herausfilterbar sind, und der katalytisch beschichtet ist, so dass in ihm abgelagerte Dieselrußpartikel abverbrennbar sind, gekennzeichnet durch eine Dosiervorrichtung (8), die stromauf des Dieseloxidationskatalysators (2) in der Abgasbehandlungsanlage (1) angeordnet ist und mittels der Dieselkraftstoff in den Abgasstrom (4) eindosierbar ist.A diesel engine exhaust gas treatment system comprising a diesel oxidation catalyst (2) by means of which the exhaust gas flow (4) of the diesel engine is reducible to hydrocarbons and carbon monoxide, and a diesel particulate filter (3) downstream of the diesel oxidation catalyst (2) in the exhaust treatment plant (1) is arranged, are filtered out by means of the diesel soot from the exhaust stream (4) of the diesel engine, and which is catalytically coated, so that in him deposited diesel soot particles are burned off, characterized by a metering device (8) upstream of the Dieseloxidationskatalysators (2) in the exhaust gas treatment plant (1) is arranged and can be metered by the diesel fuel in the exhaust stream (4).
Description
Die Erfindung bezieht sich auf eine Abgasbehandlungsanlage von Dieselmotoren, mit einem Dieseloxidationskatalysator, mittels dem der Gehalt des Abgasstroms des Dieselmotors an Kohlenwasserstoffen und an Kohlenmonoxid reduzierbar ist, und einem Dieselrußpartikelfilter, der stromab des Dieseloxidationskatalysators in der Abgasbehandlungsanlage angeordnet ist, mittels dem Dieselrußpartikel aus dem Abgasstrom des Dieselmotors herausfilterbar sind, und der katalytisch beschichtet ist, so dass in ihm abgelagerte Dieselrußpartikel abverbrennbar sind.The invention relates to an exhaust gas treatment plant of diesel engines, comprising a Dieseloxidationskatalysator, by means of which the content of the exhaust gas flow of the diesel engine to hydrocarbons and carbon monoxide is reducible, and a diesel particulate filter, which is located downstream of the Dieseloxidationskatalysators in the exhaust gas treatment plant, by means of the diesel soot particles from the exhaust gas stream are filtered out of the diesel engine, and which is catalytically coated so that deposited in it diesel soot particles are abverbrennbar.
In den Dieselmotoren nachgeschalteten Abgassträngen wird selten bzw. nie eine Temperatur von ca. 600 Grad C erreicht, die an sich erforderlich ist, um eine Abverbrennung der im Dieselrußpartikelfilter der Abgasbehandlungsanlage angesammelten Dieselrußpartikel zu ermöglichen bzw. zu gewährleisten. Die zur Behebung dieser Problematik bisher vorgeschlagenen technischen Lösungen setzen entweder Eingriffe in den Betrieb des Dieselmotors voraus oder sie erfordern einen erheblichen technisch-konstruktiven, steuerungs- und regelungstechnischen Aufwand.In the diesel engines downstream exhaust strands is rarely or never reaches a temperature of about 600 degrees C, which is necessary per se, to allow or ensure combustion of the accumulated in the diesel particulate filter of the exhaust gas treatment plant diesel soot particles. The technical solutions previously proposed to remedy this problem either require intervention in the operation of the diesel engine or they require a considerable technical and constructive, control and control technical effort.
Ausgehend von dem vorstehend geschilderten Stand der Technik liegt der Erfindung die Aufgabe zugrunde, eine Abgasbehandlungsanlage von Dieselmotoren der eingangs geschilderten Art so weiterzubilden, dass eine Abverbrennung von im Dieselrußpartikelfilter der Abgasbehandlungsanlage angesammelten Dieselrußpartikeln im üblichen Betrieb von Dieselmotoren, ohne Eingriffe in das Motormanagement derselben und – bei entsprechendem Bedarf – vollautomatisch durchführbar ist.Based on the above-described prior art, the present invention seeks to develop an exhaust gas treatment plant of diesel engines of the type described so that a combustion of accumulated in the diesel particulate filter the exhaust treatment plant diesel soot particles in the usual operation of diesel engines, without interfering with the engine management of the same and if required - fully automatic.
Diese Aufgabe wird erfindungsgemäß durch eine Dosiervorrichtung gelöst, die stromauf des Dieseloxidationskatalysators in der Abgasbehandlungsanlage angeordnet ist und mittels der Dieselkraftstoff in den Abgasstrom eindosierbar ist. Der stromauf des Dieseloxidationskatalysators in den Abgasstrom eingespritzte Dieselkraftstoff wird im Dieseloxidationskatalysator oxidiert, d. h. katalytisch verbrannt, und erhöht so die Temperatur des Abgasstroms. Eine Inbetriebsetzung der Dosiervorrichtung erfolgt immer dann, wenn aufgrund der Beladung des Dieselrußpartikelfilters mit Dieselrußpartikeln ein vorgebbarer Druckschwellenwert überschritten wird.This object is achieved by a metering device, which is arranged upstream of the diesel oxidation catalyst in the exhaust gas treatment plant and can be metered by the diesel fuel into the exhaust gas stream. The diesel fuel injected into the exhaust stream upstream of the diesel oxidation catalyst is oxidized in the diesel oxidation catalyst, i. H. catalytically burned, thus increasing the temperature of the exhaust stream. A commissioning of the metering device takes place whenever a specifiable pressure threshold value is exceeded due to the loading of the diesel particulate filter with diesel particulate matter.
Die Dosiervorrichtung ist zweckmäßigerweise als Dosierventil mit Einspritzdüse und nachgeschaltetem Kapillarröhrchen ausgebildet, durch die hindurch Dieselkraftstoff in den Abgasstrom eingespritzt werden kann.The metering device is expediently designed as a metering valve with an injection nozzle and a downstream capillary tube, through which diesel fuel can be injected into the exhaust gas stream.
Zur erfindungsgemäßen Abgasbehandlungsanlage von Dieselmotoren gehört zweckmäßigerweise ein Steuergerät, das einerseits an dem Dieseloxidationskatalysator zugeordnete Sensoren und andererseits an die Dosiervorrichtung angeschlossen ist, indem von den Sensoren erfaßte Parametersignale verarbeitbar sind und mittels dem die Dosiervorrichtung in Abhängigkeit von den verarbeiteten Parametersignalen regelbar ist.For the exhaust gas treatment system according to the invention of diesel engines expediently includes a control unit, which is connected on the one hand to the diesel oxidation catalyst sensors and on the other hand to the metering device by detected by the sensors parameter signals are processed and by means of which the metering device in dependence on the processed parameter signals can be controlled.
Die dem Dieseloxidationskatalysator zugeordneten Sensoren sind vorteilhaft als Druck- und Temperatursensoren ausgebildet, so dass ein eine Grenzbeladung anzeigender Druckabfall am Dieseloxidationskatalysator sicher anzeigbar ist, wobei darüber hinaus mittels des Temperatursensors erfassbar ist, ob die für eine Abverbrennung der Russpartikel im Dieselrußpartikelfilter erforderliche Mindesttemperatur vorliegt.The sensors associated with the diesel oxidation catalyst are advantageously designed as pressure and temperature sensors so that a pressure drop indicative of a limit charge can be safely displayed on the diesel oxidation catalyst, wherein it is also possible to detect by means of the temperature sensor whether the minimum temperature required for burning off the soot particles in the diesel particulate filter is present.
Gemäß einer vorteilhaften Ausführungsform ist im Steuergerät für den am Dieseloxidationskatalysator erfassten Druck bzw. Druckabfall und/oder für die am Dieseloxidationskatalysator erfasste Temperatur eine Druckschwelle bzw. eine Mindesttemperatur vorgebbar, bei deren Erreichen oder Überschreiten die Dosiervorrichtung automatisch in Betrieb gesetzt wird.According to an advantageous embodiment, a pressure threshold or a minimum temperature can be predetermined in the control unit for the pressure or pressure drop detected at the diesel oxidation catalytic converter and / or for the temperature detected at the diesel oxidation catalytic converter, at which point the dosing device is automatically put into operation.
Am Steuergerät ist vorteilhaft eine Dosierzeit einstellbar, mittels der die Dieselkraftstoffzufuhr je Einspritzvorgang festlegbar ist.At the control unit, a dosing time is advantageously adjustable, by means of which the diesel fuel supply per injection process can be fixed.
Darüber hinaus ist es vorteilhaft, wenn mittels des Steuergeräts mit einem Dosiertakt eine Frequenz der Einspritzdüse vorgegeben werden kann, wodurch die Dieselkraftstoffmenge für die jeweilige Dosierzeit festlegbar ist.In addition, it is advantageous if a frequency of the injection nozzle can be specified by means of the control unit with a metering cycle, whereby the amount of diesel fuel for the respective metering time can be determined.
Für die erfindungsgemäße Abgasbehandlungsanlage ist eine in einer Motorrücklaufleitung angeordnete, der Kraftstoffzufuhr zur Dosiervorrichtung dienende Kraftstoffpumpe nicht erforderlich. Entsprechend muss auch kein Relais zur Ansteuerung einer derartigen Kraftstoffpumpe verbaut werden. Vielmehr erfolgt die Kraftstoffversorgung der Dosiervorrichtung aus der Kraftstoffrücklaufleitung zum Tank, wobei eine stromab dem Leitungsabzweig zur Dosiervorrichtung angeordnete Drossel den notwendigen Druck von ca. 1 bar zur Versorgung der Einspritzdüse der Dosiervorrichtung aufbaut.For the exhaust gas treatment plant according to the invention, a fuel pump arranged in an engine return line and serving to supply fuel to the metering device is not required. Accordingly, no relay for controlling such a fuel pump must be installed. Rather, the fuel supply of the metering device from the fuel return line to the tank, wherein a downstream of the line branch to the metering device arranged throttle builds up the necessary pressure of about 1 bar to supply the injector of the metering device.
Gemäß einer vorteilhaften Ausführungsform der erfindungsgemäßen Abgasbehandlungsanlage weist deren Dieseloxidationskatalysator eine aus einem keramischen Werkstoff bestehende Wabenstruktur auf, in der vom Abgasstrom durchströmbare Strömungskanäle ausgebildet sind, wobei die aus einem keramischen Werkstoff bestehende Wabenstruktur vorteilhaft an ihren Oberflächen mit Platin beschichtet ist. Ein derartiger Dieseloxidationskatalysator ist mit einem vergleichsweise geringen technischen und wirtschaftlichen Aufwand herstellbar, wobei er ein vergleichsweise geringes Gewicht und eine hohe technische Lebensdauer aufweist.According to an advantageous embodiment of the exhaust gas treatment plant according to the invention, the diesel oxidation catalyst has a honeycomb structure consisting of a ceramic material, in which flow channels through which the exhaust gas stream flows are formed, the honeycomb structure consisting of a ceramic material advantageously having platinum on its surfaces is coated. Such a diesel oxidation catalyst can be produced with a comparatively low technical and economic expense, having a comparatively low weight and a high technical service life.
Auch der Dieselrußpartikelfilter hat gemäß einer vorteilhaften Ausführungsform der erfindungsgemäßen Abgasbehandlungsanlage eine aus einem keramischen Werkstoff, vorteilhaft aus Siliciumkarbid, bestehende Wabenstruktur, wobei diese Wabensturktur aus porösen Wabenwänden gebildet ist, zwischen denen Strömungskanäle ausgebildet sind; der eine von jeweils zwei durch eine poröse Wabenwand getrennten Strömungskanälen ist eingangsseitig des Dieselrußpartikelfilters mittels einer eingangsseitigen Abschlußwand geschlossen und ausgangsseitig des Dieselrußpartikelfilters offen, wohingegen der andere der jeweils zwei durch die poröse Wabenwand getrennten Strömungskanäle eingangsseitig des Dieselrußpartikelfilters offen und ausgangsseitig des Dieselrußpartikelfilters mittels einer ausgangsseitigen Abschlußwand geschlossen ist. Hierdurch wird sichergestellt, dass der Abgasstrom bei seinem Durchtritt durch den Dieselrußpartikelfilter durch die porösen Wabenwände der Wabenstruktur hindurchströmen muß, wobei in den porösen Wabenwänden im Abgasstrom vorhandene Dieselrußpartikel aufgenommen werden.The diesel particulate filter according to an advantageous embodiment of the exhaust gas treatment plant according to the invention has a honeycomb structure consisting of a ceramic material, advantageously of silicon carbide, wherein this honeycomb structure is formed of porous honeycomb walls, between which flow channels are formed; one of each two by a porous honeycomb wall flow channels is closed on the input side of the diesel particulate filter by means of an input side end wall and the output side of the diesel particulate filter open, whereas the other of the two separate through the porous honeycomb wall flow channels on the inlet side of the diesel particulate filter open and output side of the diesel particulate filter by means of an output side end wall closed is. This ensures that the exhaust gas flow must pass through the porous honeycomb walls of the honeycomb structure as it passes through the diesel particulate filter, wherein existing in the porous honeycomb walls in the exhaust gas flow existing diesel soot.
Im Folgenden wird die Erfindung anhand einer Ausführungsform unter Bezugnahme auf die Zeichnung näher erläutert.In the following the invention will be explained in more detail with reference to an embodiment with reference to the drawing.
Es zeigen:Show it:
Eine in
In Bezug auf einen den Abgasstrang des Dieselmotors durchströmenden Abgasstrom
Der Dieseloxidationskatalysator
Die Wabenstruktur
Außer zur Verminderung der vorstehend erwähnten Kohlenstoffmonoxid- und Kohlenwasserstoff-Emissionen wird der Dieseloxidationskatalysator
Um im aus dem Dieseloxidationskatalysator
Der Dieseloxidationskatalysator
Der Dieselrußpartikelfilter
Die Anordnung der Strömungskanäle
Aufgrund dieser Anordnung der Strömungskanäle
Wenn der Abgasstrom
Die Reaktion zwischen dem in Form von Partikeln im Dieselrußpartikelfilter
Im Dieselrußpartikelfilter
Die Dosiervorrichtung
Das Steuergerät
Wenn am Steuergerät
Claims (12)
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DE202009012592U DE202009012592U1 (en) | 2009-09-16 | 2009-09-16 | Exhaust treatment plant of diesel engines |
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CN109012178A (en) * | 2018-09-14 | 2018-12-18 | 耿守祯 | A kind of diesel engine vent gas filtering purification method |
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