EP0442331B1 - Method and apparatus for diminishing the possibility of gas detection - Google Patents

Method and apparatus for diminishing the possibility of gas detection Download PDF

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Publication number
EP0442331B1
EP0442331B1 EP91101318A EP91101318A EP0442331B1 EP 0442331 B1 EP0442331 B1 EP 0442331B1 EP 91101318 A EP91101318 A EP 91101318A EP 91101318 A EP91101318 A EP 91101318A EP 0442331 B1 EP0442331 B1 EP 0442331B1
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EP
European Patent Office
Prior art keywords
exhaust gas
diesel engine
exhaust
cooling
cooling device
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP91101318A
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German (de)
French (fr)
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EP0442331A1 (en
Inventor
Hubert-Peter Dr. Hitziger
Helmut Pleimling
Werner Dr. Dietrich
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Kloeckner Humboldt Deutz AG
Caterpillar Energy Solutions GmbH
Original Assignee
Kloeckner Humboldt Deutz AG
Motoren Werke Mannheim AG
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Priority to DE59101739T priority Critical patent/DE59101739D1/en
Publication of EP0442331A1 publication Critical patent/EP0442331A1/en
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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
    • 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
    • F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/025—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 using means for regenerating the filters, e.g. by burning trapped particles using fuel burner or by adding fuel to exhaust
    • 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
    • F01N3/023—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 using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/027—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 using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means
    • 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
    • F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
    • F01N3/043—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids without contact between liquid and exhaust gases
    • 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
    • F01N2250/00—Combinations of different methods of purification
    • F01N2250/10—Combinations of different methods of purification cooling and filtering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Definitions

  • the invention relates to a method and a device for reducing the location of gases, in particular exhaust gases from a diesel internal combustion engine.
  • Exhaust gases from diesel engines can be located due to their emission of electromagnetic waves in the visible and infrared range.
  • white and blue smoke emissions play a role in cold starts and warm-up operation
  • black smoke emissions play a role in warm starts, acceleration and under load.
  • the entire exhaust gas mass radiates in the infrared range depending on its temperature.
  • the diesel soot which is a black emitter, emits particularly intensely.
  • GB-A 2,161,397 describes a device for the aftertreatment of the exhaust gases from diesel engines, in which the exhaust gas is filtered in the entire operating range of the diesel internal combustion engine and then cooled and in certain cases can be heated before cooling.
  • the invention has for its object to improve the solution of the generic script to prevent the location of the exhaust gases from internal combustion engines, in particular diesel internal combustion engines in their entire operating range including cold start and warm-up.
  • the filtering of the exhaust gases primarily removes the clearly visible and intensely heat-radiating soot particles.
  • the cold but also clearly visible White and blue smoke is ignited by heating and burns to invisible carbon dioxide and water vapor due to the residual oxygen contained in the exhaust gas of the diesel engine. It is basically the same whether the white and blue smoke is heated before or after filtering the exhaust gas.
  • heating up before filtering has the advantage that only one exhaust gas heating device is required to burn the hydrocarbons in the exhaust gas and to heat up the particle filter for regeneration.
  • Cooling the exhaust gas reduces its radiation intensity in the infrared range. Since the exhaust gas heat is required for the regeneration of the particle filter device and since heat is generated during the regeneration in the particle filter device itself, it is expedient to carry out the cooling of the exhaust gas after the filtering and therefore to arrange the exhaust gas cooling device downstream of the particle filter device.
  • the exhaust gas cooling device acts in all operating points of the diesel internal combustion engine, while the exhaust gas heating device is only required for the combustion of the white and blue smoke and for the regeneration of the particle filter device.
  • Monolithic ceramic filters are particularly suitable for thermal regeneration. They can be heated by means of electrical resistance heating or by means of flame heating.
  • the electrical resistance heating has the advantage that it does not consume any residual oxygen when heating, and is therefore particularly suitable for burning the hydrocarbons during cold start and warm-up.
  • flame heating has the advantage of being operated with low electrical energy. This in turn offers the option of operating the flame heater before starting the diesel engine.
  • the diesel engine can be preheated via the exhaust gas cooling device if it is connected to the liquid cooling system of the diesel engine. In this way, the formation of white and blue smoke is largely avoided and its possible existing residues are burned immediately, so that an optical location of the diesel engine is hardly possible even with a cold start.
  • the exhaust gas cooling device can be bypassed by an advantageous development of the invention and thus be overridden. In this case, the exhaust gas flows outside without cooling, which saves cooling power and thus fuel.
  • An advantageous design of the exhaust gas cooling device provides corrosion protection against the hot sulfur dioxide-containing exhaust gases and against aggressive components of the cooling water. This advantage has a particular impact on marine diesel engines, where the risk of corrosion is particularly high due to the high sulfur content of the fuel and - in the case of sea water cooling - because of the aggressiveness of the sea water.
  • the figure shows: is a schematic representation of the diesel engine with a device for reducing the location of the exhaust gases.
  • the diesel internal combustion engine 1 is supplied with combustion air via the intake air line 8 and in turn emits the exhaust gases to the exhaust line 2.
  • An exhaust gas heating device 3, a particle filter device 4 and an exhaust gas cooling device 5 are provided in the exhaust gas line 2 in series in the flow direction.
  • the exhaust gas cooling device 5 is connected to a bypass line 6 with a shut-off device 7 in parallel.
  • the device works as follows: The exhaust gases of the diesel internal combustion engine 1 are conducted via the exhaust line 2 to the particle filter device 4, in which the exhaust soot is largely filtered out. The cleaned exhaust gas then passes into the exhaust gas cooling device 5, in which the exhaust gas is cooled.
  • This is preferably a ceramic heat exchanger that is particularly resistant to the hot, corrosive exhaust gas and the cooling water.
  • the cooling circuit of the exhaust gas cooling device 5 is connected to that of the diesel internal combustion engine, so that the cooling heat of the diesel internal combustion engine 1 and the exhaust gas cooling device 5 is given to the air in a common recooler.
  • a bypass line 6 with a shut-off device 7 is available.
  • the particle filter device 4 is a monolithic ceramic filter or ceramic wound-candle filter or other filter of known or possible type. If these filters are coated with soot, they can e.g. B. regenerated by burning.
  • the exhaust gas heating device 3 supplies the heat required for this purpose. With the exhaust gas heating device 3, the exhaust gas is also heated during the cold start and warm-up of the diesel internal combustion engine 1. This burns any white or blue smoke that may be generated and prevents the diesel engine from being recognized even during a cold start. Likewise, however, are all other regeneration processes that work according to the heating method or the method of lowering the reaction temperatures of soot, white and blue smoke.
  • the exhaust gas heating device 3 can also be used for preheating the diesel engine and for auxiliary heating.
  • the exhaust gas cooling device 5 is used via the common cooling circuit, the diesel engine 1 and a possibly existing heating heat exchanger to heat up.
  • an electric cooling water pump is advantageously provided, which keeps the cooling circuit going even when the diesel internal combustion engine is at a standstill.
  • the exhaust gas cooling device 5 In stationary application, it may be advantageous to use the exhaust gas cooling device 5 as part of a total energy system. This possibility also exists in the case of ship drives, with fresh water cooling of the exhaust gas cooling device 5 being possible here in the event of a lack of heat.
  • the device according to the invention makes it possible, by cleaning and cooling the exhaust gas, to make it considerably more difficult to locate diesel internal combustion engines, specifically when they are used in vehicles, ships and stationary systems.

Description

Die Erfindung betriffl ein Verfahren und eine Vorrichtung zur Verminderung der Ortbarkeit von Gasen, insbesondere von Abgasen einer Dieselbrennkraftmaschine.The invention relates to a method and a device for reducing the location of gases, in particular exhaust gases from a diesel internal combustion engine.

Abgase von Dieselbrennkraftmaschinen können aufgrund ihrer Emission von elektromagnetischen Wellen im sichtbaren und infraroten Bereich geortet werden. Im sichtbaren Bereich spielt bei Kaltstart und Warmlaufbetrieb die Weiß- und Blaurauchemission, beim Warmstart, Beschleunigen und unter Last die Schwarzrauchemission eine Rolle. Im Infrarotbereich strahlt die gesamte Abgasmasse in Abhängigkeit von ihrer Temperatur. Besonders intensiv emittiert der Dieselruß, der ein schwarzer Strahler ist.Exhaust gases from diesel engines can be located due to their emission of electromagnetic waves in the visible and infrared range. In the visible range, white and blue smoke emissions play a role in cold starts and warm-up operation, black smoke emissions play a role in warm starts, acceleration and under load. The entire exhaust gas mass radiates in the infrared range depending on its temperature. The diesel soot, which is a black emitter, emits particularly intensely.

Die durch Emissionen im sichtbaren und unsichtbaren Bereich bedingte Ortbarkeit von Abgasen kann speziell in militärischen Anwendungsfällen unerwünscht sein.The location of exhaust gases caused by emissions in the visible and invisible range can be undesirable, especially in military applications.

In der GB-A 2,161,397 ist eine Vorrichtung zur Nachbehandlung der Abgase von Dieselmotoren beschrieben, bei der im gesamten Betriebsbereich der Diesel-Brennkraftmaschine das Abgas gefiltert und anschließend gekühlt wird und in gewissen Fällen vor dem Kühlen aufgeheizt werden kann.GB-A 2,161,397 describes a device for the aftertreatment of the exhaust gases from diesel engines, in which the exhaust gas is filtered in the entire operating range of the diesel internal combustion engine and then cooled and in certain cases can be heated before cooling.

Der Erfindung liegt die Aufgabe zugrunde, die Lösung der gattungsbildenen Schrift dahingehend zu verbessern, die Ortbarkeit der Abgase von Brennkraftmaschinen insbesondere von Dieselbrennkraftmaschinen in deren gesamten Betriebsbereich einschließlich Kaltstart und Warmlauf zu verhindern.The invention has for its object to improve the solution of the generic script to prevent the location of the exhaust gases from internal combustion engines, in particular diesel internal combustion engines in their entire operating range including cold start and warm-up.

Die Aufgabe wird durch die kennzeichnenden Merkmale der Ansprüche 1 und 3 gelöst.The object is achieved by the characterizing features of claims 1 and 3.

Durch die Filterung der Abgase werden in erster Linie die gut sichtbaren und intensiv wärmestrahlenden Rußpartikel beseitigt. Der kalte aber ebenfalls gut sichtbare Weiß- und Blauqualm wird durch Aufheizen entflammt und verbrennt aufgrund des im Abgas der Dieselbrennkraftmaschine enthaltenen Restsauerstoffs zu unsichtbarem Kohlendioxid und Wasserdampf. Dabei ist es grundsätzlich gleich, ob der Weiß- und Blauqualm vor oder nach dem Filtern des Abgases aufgeheizt wird. Das Aufheizen vor dem Filtern hat jedoch den Vorteil, daß nur eine Abgasaufheizvorrichtung erforderlich ist um die Kohlenwasserstoffe im Abgas zu verbrennen und das Partikelfilter zur Regeneration aufzuheizen.The filtering of the exhaust gases primarily removes the clearly visible and intensely heat-radiating soot particles. The cold but also clearly visible White and blue smoke is ignited by heating and burns to invisible carbon dioxide and water vapor due to the residual oxygen contained in the exhaust gas of the diesel engine. It is basically the same whether the white and blue smoke is heated before or after filtering the exhaust gas. However, heating up before filtering has the advantage that only one exhaust gas heating device is required to burn the hydrocarbons in the exhaust gas and to heat up the particle filter for regeneration.

Durch das Abkühlen des Abgases verringert sich dessen Strahlungsintensität im Infrarotbereich. Da die Abgaswärme zur Regeneration der Partikelfiltervorrichtung benötigt wird und da bei der Regeneration in der Partikelfiltervorrichtung selbst Wärme anfällt, ist es zweckmäßig, die Kühlung des Abgases nach der Filterung vorzunehmen und deshalb die Abgaskühlvorrichtung in Strömungsrichtung hinter der Partikelfiltervorrichtung anzuordnen. Die Abgaskühlvorrichtung wirkt in allen Betriebspunkten der Dieselbrennkraftmaschine, während die Abgasaufheizvorrichtung nur zur Verbrennung des Weiß- und Blauqualms und zur Regeneration der Partikelfiltervorrichtung benötigt wird.Cooling the exhaust gas reduces its radiation intensity in the infrared range. Since the exhaust gas heat is required for the regeneration of the particle filter device and since heat is generated during the regeneration in the particle filter device itself, it is expedient to carry out the cooling of the exhaust gas after the filtering and therefore to arrange the exhaust gas cooling device downstream of the particle filter device. The exhaust gas cooling device acts in all operating points of the diesel internal combustion engine, while the exhaust gas heating device is only required for the combustion of the white and blue smoke and for the regeneration of the particle filter device.

Für eine thermische Regeneration eignen sich besonders monolitische Keramikfilter. Ihre Aufheizung kann mittels elektrischer Widerstandsheizung oder mittels Flammheizung erfolgen. Die elektrische Widerstandsheizung bietet den Vorteil, daß sie beim Heizen keinen Restsauerstoff verbraucht, und deshalb zur Verbrennung der Kohlenwasserstoffe während des Kaltstarts und Warmlaufs besonders geeignet ist. Dem gegenüber hat die Flammheizung den Vorteil, mit geringer elektrischer Energie betrieben zu werden. Das wiederrum bietet die Möglichkeit, die Flammheizung vor Inbetriebnanme der Dieselbrennkraftmaschine zu betreiben. Dadurch kann die Dieselbrennkraftmaschine über die Abgaskühlvorrichtung vorgewärmt werden, falls diese an das Flüssigkeitskühlsystem der Dieselbrennkraftmaschine angeschlossen ist. Auf diese Weise wird die Bildung von Weiß- und Blauqualm weitgehend vermieden und dessen evtl. vorhandene Reste werden sofort verbrannt, so daß eine optische Ortung der Dieselbrennkraftmaschine auch bei einem Kaltstart kaum möglich ist.Monolithic ceramic filters are particularly suitable for thermal regeneration. They can be heated by means of electrical resistance heating or by means of flame heating. The electrical resistance heating has the advantage that it does not consume any residual oxygen when heating, and is therefore particularly suitable for burning the hydrocarbons during cold start and warm-up. In contrast, flame heating has the advantage of being operated with low electrical energy. This in turn offers the option of operating the flame heater before starting the diesel engine. As a result, the diesel engine can be preheated via the exhaust gas cooling device if it is connected to the liquid cooling system of the diesel engine. In this way, the formation of white and blue smoke is largely avoided and its possible existing residues are burned immediately, so that an optical location of the diesel engine is hardly possible even with a cold start.

So lange eine optische Tarnung der Dieselbrennkraftmaschine nicht erforderlich oder gewünscht ist, kann durch eine vorteilhafte Weiterbildung der Erfindung die Abgaskühlvorrichtung umgangen und damit außer Kraft gesetzt werden. In diesem Fall strömt das Abgas ungekühlt ins Freie, wodurch Kühlleistung und damit Kraftstoff gespart werden.As long as an optical camouflage of the diesel internal combustion engine is not necessary or desired, the exhaust gas cooling device can be bypassed by an advantageous development of the invention and thus be overridden. In this case, the exhaust gas flows outside without cooling, which saves cooling power and thus fuel.

Durch eine vorteilhafte Ausbildung der Abgaskühlvorrichtung wird ein Korrosionsschutz gegen die heißen schwefeldioxidhaltigen Abgase und gegen agressive Bestandteile des Kühlwassers erreicht. Dieser Vorteil wirkt sich besonders bei Schiffdieselmotoren aus, bei denen die Korrosionsgefahr wegen des hohen Schwefelgehaltes des Kraftstoffs und -bei Seewasserkühlung- wegen der Agressivität des Seewassers besonders hoch ist.An advantageous design of the exhaust gas cooling device provides corrosion protection against the hot sulfur dioxide-containing exhaust gases and against aggressive components of the cooling water. This advantage has a particular impact on marine diesel engines, where the risk of corrosion is particularly high due to the high sulfur content of the fuel and - in the case of sea water cooling - because of the aggressiveness of the sea water.

Weitere Merkmale ergeben sich aus der folgenden Beschreibung und der Zeichnung, in der Ausführungsbeispiele der Erfindung schematisch dargestellt sind.Further features result from the following description and the drawing, in which exemplary embodiments of the invention are shown schematically.

Die Figur zeigt:
eine schematische Darstellung der Dieselbrennkraftmaschine mit einer Vorrichtung zur Verminderung der Ortbarkeit der Abgase.The figure shows:
is a schematic representation of the diesel engine with a device for reducing the location of the exhaust gases.

Die Dieselbrennkraftmaschine 1 wird über die Ansaugluftleitung 8 mit Verbrennungsluft versorgt und gibt ihrerseits die Abgase an die Abgasleitung 2 ab. In der Abgasleitung 2 sind in Strömungsrichtung hintereinander geschaltet eine Abgasaufheizvorrichtung 3, eine Partikelfiltervorrichtung 4 und eine Abgaskühlvorrichtung 5 vorgesehen. Der Abgaskühlvorrichtung 5 ist eine Umgehungsleitung 6 mit einer Absperrvorrichtung 7 parallel geschaltet.The diesel internal combustion engine 1 is supplied with combustion air via the intake air line 8 and in turn emits the exhaust gases to the exhaust line 2. An exhaust gas heating device 3, a particle filter device 4 and an exhaust gas cooling device 5 are provided in the exhaust gas line 2 in series in the flow direction. The exhaust gas cooling device 5 is connected to a bypass line 6 with a shut-off device 7 in parallel.

Die Vorrichtung funktioniert folgendermaßen: Die Abgase der Dieselbrennkraftmaschine 1 werden über die Abgasleitung 2 zur Partikelfiltervorrichtung 4 geleitet, in der der Abgasruß weitgehend ausgefiltert wird. Anschließend gelangt das gereinigte Abgas in die Abgaskühlvorrichtung 5, in der das Abgas gekühlt wird. Hierbei handelt es sich vorzugsweise um einen Keramikwärmetauscher, der besonders widerstandsfähig gegen das heiße, korrosive Abgas und gegen das Kühlwasser ist.The device works as follows: The exhaust gases of the diesel internal combustion engine 1 are conducted via the exhaust line 2 to the particle filter device 4, in which the exhaust soot is largely filtered out. The cleaned exhaust gas then passes into the exhaust gas cooling device 5, in which the exhaust gas is cooled. This is preferably a ceramic heat exchanger that is particularly resistant to the hot, corrosive exhaust gas and the cooling water.

Im Falle eines Fahrzeugs steht der Kühlkreislauf der Abgaskühlvorrichtung 5 mit dem der Dieselbrennkraftmaschine in Verbindung, so daß die Kühlwärme der Dieselbrennkraftmaschine 1 und der Abgaskühlvorrichtung 5 in einem gemeinsamen Rückkühler an die Luft angegeben wird. Für den Fall, daß die Abkühlung der Abgase nicht erforderlich ist, steht eine Umgehungsleitung 6 mit einer Absperrvorrichtung 7 zur Verfügung.In the case of a vehicle, the cooling circuit of the exhaust gas cooling device 5 is connected to that of the diesel internal combustion engine, so that the cooling heat of the diesel internal combustion engine 1 and the exhaust gas cooling device 5 is given to the air in a common recooler. In the event that cooling of the exhaust gases is not necessary, a bypass line 6 with a shut-off device 7 is available.

Bei der Partikelfiltervorrichtung 4 handelt es sich um monolithische Keramikfilter oder keramische Wickelkerzenfilter oder andere Filter bekannter oder möglicher Bauart. Wenn diese Filter mit Ruß belegt sind, können sie z. B. durch Abbrennen regeneriert werden. Die dazu erforderliche Wärme liefert die Abgasaufheizvorrichtung 3. Mit der Abgasaufheizvorrichtung 3 wird das Abgas auch während des Kaltstarts und Warmlaufens der Dieselbrennkraftmaschine 1 aufgeheizt. Dadurch wird evtl. entstehender Weiß- oder Blauqualm verbrannt und die Erkennbarkeit der Dieselbrennkraftmaschine auch bei einem Kaltstart verhindert. Ebenso eignen sich aber alle anderen Regenerierverfahren, die nach der Aufheizmethode oder aber nach der Methode der Absenkung der Reaktionstemperaturen von Ruß, Weiß- und Blaurauch funktionieren.The particle filter device 4 is a monolithic ceramic filter or ceramic wound-candle filter or other filter of known or possible type. If these filters are coated with soot, they can e.g. B. regenerated by burning. The exhaust gas heating device 3 supplies the heat required for this purpose. With the exhaust gas heating device 3, the exhaust gas is also heated during the cold start and warm-up of the diesel internal combustion engine 1. This burns any white or blue smoke that may be generated and prevents the diesel engine from being recognized even during a cold start. Likewise, however, are all other regeneration processes that work according to the heating method or the method of lowering the reaction temperatures of soot, white and blue smoke.

Die Abgasaufheizvorrichtung 3 kann auch zur Vorwärmung der Dieselbrennkraftmaschine und zur Standheizung verwendet werden. In diesem Fall wird die Abgaskühlvorrichtung 5 dazu benutzt über den gemeinsamen Kühlkreislauf die Dieselbrennkraftmaschine 1 und einen evtl. vorhandenen Heizungswärmetauscher aufzuheizen. Dazu ist vorteilhafterweise eine elektrische Kühlwasserpumpe vorgesehen, die auch bei stillstehender Dieselbrennkraftmaschine den Kühlkreislauf in Gang hält.The exhaust gas heating device 3 can also be used for preheating the diesel engine and for auxiliary heating. In this case, the exhaust gas cooling device 5 is used via the common cooling circuit, the diesel engine 1 and a possibly existing heating heat exchanger to heat up. For this purpose, an electric cooling water pump is advantageously provided, which keeps the cooling circuit going even when the diesel internal combustion engine is at a standstill.

Im stationären Anwendungsfall kann es von Vorteil sein, die Abgaskühlvorrichtung 5 als Teil einer Totalenergieanlage zu verwenden. Diese Möglichkeit besteht auch bei Schiffsantrieben, wobei hier im Falle fehlenden Wärmebedarfs eine Frischwasserkühlung der Abgaskühlvorrichtung 5 möglich ist.In stationary application, it may be advantageous to use the exhaust gas cooling device 5 as part of a total energy system. This possibility also exists in the case of ship drives, with fresh water cooling of the exhaust gas cooling device 5 being possible here in the event of a lack of heat.

Durch die erfindungsgemäße Vorrichtung ist es möglich, durch Reinigen und Kühlen des Abgases die Ortung von Dieselbrennkraftmaschinen erheblich zu erschweren, und zwar bei deren Einsatz in Fahrzeugen, Schiffen und Stationäranlagen.The device according to the invention makes it possible, by cleaning and cooling the exhaust gas, to make it considerably more difficult to locate diesel internal combustion engines, specifically when they are used in vehicles, ships and stationary systems.

Claims (10)

  1. A method for reducing the extent to which the exhaust gases of a Diesel engine can be detected, in which the exhaust gas is filtered and subsequently cooled throughout the entire operating range of the Diesel engine, and in certain operating ranges may be heated prior to cooling,
    characterised in that the exhaust gases are heated during the cold-start and warming-up of the Diesel engine to burn hydrocarbons contained in the exhaust gas in order to reduce the degree to which visible hydrocarbon emissions can be detected.
  2. A method according to claim 1,
    characterised in that the exhaust gases are heated prior to being filtered.
  3. Apparatus for carrying out the method according to claim 1 with a Diesel engine (1), the exhaust gases of which engine flow through an exhaust gas duct (2) in which a particle filtering device (4), an exhaust gas cooling device (5), and, optionally, an exhaust gas heating device (3) in front of the particle filtering device (4), are arranged sequentially in the direction of flow,
    characterised in that the particle filtering device (4) is in the form of a monolithic ceramic filter.
  4. Apparatus according to claim 3,
    characterised in that the exhaust gas heating device (3) functions by means of electrical resistance heating.
  5. Apparatus according to claim 3,
    characterised in that the exhaust gas heating device (3) functions by means of flame heating.
  6. Apparatus according to any one of claims 3 to 5,
    characterised in that a device for reducing the reaction temperatures of soot, blue and white smoke is arranged in front of, or within, the filter (4).
  7. Apparatus according to any one of claims 3 to 6,
    characterised in that the exhaust gas cooling device (5) is in the form of a corrosion-resistant, preferably ceramic water/gas cooler.
  8. Apparatus according to claim 7,
    characterised in that the cooling circuit of the exhaust gas cooling device (5) is operatively linked to the cooling circuit of the Diesel engine (1).
  9. Apparatus according to claim 7,
    characterised in that the exhaust gas cooling device (5) can be directly impinged upon by sea water.
  10. Apparatus according to any one of claims 3 to 9,
    characterised in that a bypass line (6), which can be closed off, is provided for the exhaust gas cooling device (5).
EP91101318A 1990-02-15 1991-02-01 Method and apparatus for diminishing the possibility of gas detection Expired - Lifetime EP0442331B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE59101739T DE59101739D1 (en) 1991-02-01 1991-02-01 Method and device for reducing the location of gases.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19904004636 DE4004636A1 (en) 1990-02-15 1990-02-15 METHOD AND DEVICE FOR REDUCING THE LOCALITY OF GASES

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EP0442331A1 EP0442331A1 (en) 1991-08-21
EP0442331B1 true EP0442331B1 (en) 1994-06-01

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DE (1) DE4004636A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2005285C2 (en) * 2010-08-27 2012-02-28 Trs Transportkoeling B V COMBUSTION ENGINE WITH EXHAUST PIPE.
NL2005284C2 (en) * 2010-08-27 2012-02-28 Trs Transportkoeling B V COMBUSTION ENGINE WITH EXHAUST PIPE.
DE102011015513A1 (en) * 2011-03-30 2012-10-04 Dif Die Ideenfabrik Gmbh An emission control device for a watercraft and a method for operating an emission control device

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GB2161397A (en) * 1984-07-11 1986-01-15 Michael George Berry Exhaust catalytic combustor

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Also Published As

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EP0442331A1 (en) 1991-08-21
DE4004636A1 (en) 1991-08-22

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