EP3426901B1 - Feeding arrangement for introducing recirculated exhaust gas - Google Patents

Feeding arrangement for introducing recirculated exhaust gas Download PDF

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Publication number
EP3426901B1
EP3426901B1 EP17709353.1A EP17709353A EP3426901B1 EP 3426901 B1 EP3426901 B1 EP 3426901B1 EP 17709353 A EP17709353 A EP 17709353A EP 3426901 B1 EP3426901 B1 EP 3426901B1
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EP
European Patent Office
Prior art keywords
exhaust gas
fresh air
air duct
quick
fresh
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Active
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EP17709353.1A
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German (de)
French (fr)
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EP3426901A1 (en
Inventor
Hermann Braun
Thomas Rode
Christian-Paul Stelzer
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Rolls Royce Solutions GmbH
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MTU Friedrichshafen GmbH
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Publication of EP3426901A1 publication Critical patent/EP3426901A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/17—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the intake system
    • F02M26/19—Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/12—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having slidably-mounted valve members; having valve members movable longitudinally of conduit
    • F02D9/14—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having slidably-mounted valve members; having valve members movable longitudinally of conduit the members being slidable transversely of conduit

Definitions

  • the invention relates to a supply arrangement for exhaust gas to be recycled into the combustion air of internal combustion engines.
  • part of the exhaust gas generated during the combustion is supplied to the fresh air required for the combustion of the fuel as an inert gas, in order to thereby reduce the oxygen content of the combustion air.
  • the combustion takes place at a lower temperature level and the formation of nitrogen oxides is reduced.
  • Various supply arrangements are shown for the introduction of the exhaust gas formed during the combustion into the combustion air. These are several exhaust gas supply pipes that are inserted into the respective fresh air ducts of the individual cylinders.
  • the described arrangements aim to achieve the most homogeneous possible mixing of the exhaust gas with the fresh combustion air so that the temperature level of the combustion can be reduced uniformly in all cylinders of the internal combustion engine.
  • soot particles contained in the exhaust gas get into the fresh air duct, which stick to the edges and shoulders of the fresh air duct when the internal combustion engine is in operation for a long time.
  • These deposits are particularly problematic when the internal combustion engine is equipped with quick-closing flaps, which are provided for the rapid shutdown of the internal combustion engine in emergency situations. They are located in the fresh air duct of the internal combustion engine and close it in order to immediately interrupt the fresh air supply required for combustion.
  • Soot particle deposits in the area of the quick-closing flap mean that when the quick-closing flaps are actuated, the fresh air supply is not completely interrupted due to deposits and the associated lack of sealing of the fresh air duct, or the flaps are not triggered due to particle deposits in the flap mechanism, which completely prevents the The internal combustion engine cannot therefore be switched off despite the mechanism being triggered.
  • maintenance requirements are therefore often made for corresponding internal combustion engines, which provide for regular manual triggering of the quick-closing flaps, thereby remove any deposits in the area of the flaps. In practice, this has proven to be very complex.
  • the object of the present invention is to minimize the maintenance requirements.
  • a quick-closing flap is arranged in the fresh air duct to interrupt the fresh air supply in front of a cylinder head of the internal combustion engine.
  • the outlet opening of the exhaust gas recirculation is arranged centrally in the fresh air duct and in the direction of flow of the fresh air with minimal gap formation in front of the quick-closing flap.
  • the outlet opening of the exhaust gas recirculation and the flap plate of the quick-closing flap do not touch each other in the closed state.
  • a pipe bend is used for the supply of the exhaust gas flow.
  • An advantage of the arrangement according to the invention is that the mixing of exhaust gas and fresh air flows, viewed in the direction of flow, only takes place behind the quick-closing flap.
  • the inventive arrangement of the exhaust gas recirculation results in a very homogeneous mixing of fresh air and recirculated exhaust gas.
  • the exhaust gas flow introduced into the fresh air flow concentrically spreads out in the fresh air duct from the outlet opening as a turbulent flow until it reaches the wall of the fresh air duct.
  • the length of the route until the wall of the fresh air duct is reached depends on the Reynolds numbers of the two streams.
  • the direct arrangement of the outlet opening of the exhaust gas supply pipe in front of the flap plate of the quick-closing flap ensures that the soot particles contained in the exhaust gas are not deposited in the region of the flap mechanism. This ensures that the flap mechanism is always ready for operation, eliminating the need for regular manual operation of the quick-closing flap.
  • FIG. 1 A fresh air duct 1 of an internal combustion engine is shown. When viewed in the direction of the drawing, the fresh air required for combustion flows from top to bottom into the fresh air duct 1, reference symbol ON.
  • the quick-closing flap 4 comprises a quick-closing flap mechanism 7 and a flap plate 6. The quick-closing flap 4 is closed if necessary by triggering the quick-closing flap mechanism 7.
  • the outlet opening 2 of the exhaust gas recirculation 3 is located centrally in the fresh air duct 1 to be understood in such a way that the outlet opening 2 of the exhaust gas recirculation 3 is arranged in front of the flap plate 6 of the quick-closing flap 4 with minimal gap formation, so that the outlet opening 2 and the flap plate 6 do not just touch when the quick-closing flap 4 is closed.
  • the central arrangement of the outlet opening 2 in the fresh air duct 1 is necessary, on the one hand, to achieve the most homogeneous possible mixing of the two gases and, on the other hand, to make the distance as large as possible until the inner wall of the soot particles contained in the exhaust gas is reached.
  • the exhaust gas recirculation 3 is designed as a pipe bend 5.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Exhaust Gas After Treatment (AREA)

Description

Die Erfindung betrifft eine Zuführungsanordnung für rückzuführendes Abgas in die Verbrennungsluft von Brennkraftmaschinen.The invention relates to a supply arrangement for exhaust gas to be recycled into the combustion air of internal combustion engines.

Bei der Abgasrückführung wird ein Teil des bei der Verbrennung entstandenen Abgases der zur Verbrennung des Kraftstoffs benötigten Frischluft als Inertgas zugeführt, um dadurch den Sauerstoffgehalt der Verbrennungsluft zu reduzieren. Hierdurch läuft die Verbrennung auf einem niedrigeren Temperaturniveau ab und die Entstehung von Stickoxiden wird vermindert. Aus der JP 931 7579 A wie auch aus der EP 2 541 033 A1 sind verschiedene Zuführungsanordnungen für die Einleitung des bei der Verbrennung entstehenden Abgases in die Verbrennungsluft dargestellt. Hierbei handelt es sich um mehrere Abgaszuleitungsrohre, die in die jeweiligen Frischluftkanäle der einzelnen Zylinder eingesetzt werden. Durch die beschriebenen Anordnungen soll eine möglichst homogene Durchmischung des Abgases mit der frischen Verbrennungsluft erreicht werden, um so in allen Zylindern der Brennkraftmaschine das Temperaturniveau der Verbrennung gleichmäßig absenken zu können. Durch die Einleitung des Abgases gelangen jedoch im Abgas enthaltene Rußpartikel in den Frischluftkanal, die sich bei längerer Betriebsdauer der Brennkraftmaschine unter anderem an den Kanten und Absätzen des Frischluftkanals festsetzen. Problematisch sind diese Ablagerungen insbesondere dann, wenn die Brennkraftmaschine mit Schnellschlussklappen ausgestattet ist, die zur schnellen Abschaltung der Brennkraftmaschine in Notsituationen vorgesehen sind. Sie befinden sich im Frischluftkanal der Brennkraftmaschine und verschließen diesen, um dadurch eine sofortige Unterbrechung der zur Verbrennung notwendigen Frischluftzufuhr zu erreichen. Durch Rußpartikelablagerungen im Bereich der Schnellschlussklappe besteht die Gefahr, dass bei Betätigung der Schnellschlussklappen die Frischluftzufuhr auf Grund von Ablagerungen und damit verbunden durch fehlende Abdichtung des Frischluftkanals nicht vollständig unterbrochen wird oder ein Auslösen der Klappen auf Grund von Partikelablagerungen im Klappenmechanismus vollständig verhindert wird, wodurch die Brennkraftmaschine somit trotz eines Auslösens des Mechanismus nicht abgeschaltet werden kann. Um die ständige Funktionsfähigkeit der Schnellschlussklappen zu gewährleisten, werden für entsprechende Brennkraftmaschinen daher oftmals Wartungsanforderungen aufgestellt, die ein regelmäßiges manuelles Auslösen der Schnellschlussklappen vorsehen, um dadurch eventuelle Ablagerungen im Bereich der Klappen zu entfernen. In der Praxis hat sich dies als sehr aufwendig herausgestellt.In the exhaust gas recirculation, part of the exhaust gas generated during the combustion is supplied to the fresh air required for the combustion of the fuel as an inert gas, in order to thereby reduce the oxygen content of the combustion air. As a result, the combustion takes place at a lower temperature level and the formation of nitrogen oxides is reduced. From the JP 931 7579 A as well as from the EP 2 541 033 A1 Various supply arrangements are shown for the introduction of the exhaust gas formed during the combustion into the combustion air. These are several exhaust gas supply pipes that are inserted into the respective fresh air ducts of the individual cylinders. The described arrangements aim to achieve the most homogeneous possible mixing of the exhaust gas with the fresh combustion air so that the temperature level of the combustion can be reduced uniformly in all cylinders of the internal combustion engine. By introducing the exhaust gas, however, soot particles contained in the exhaust gas get into the fresh air duct, which stick to the edges and shoulders of the fresh air duct when the internal combustion engine is in operation for a long time. These deposits are particularly problematic when the internal combustion engine is equipped with quick-closing flaps, which are provided for the rapid shutdown of the internal combustion engine in emergency situations. They are located in the fresh air duct of the internal combustion engine and close it in order to immediately interrupt the fresh air supply required for combustion. Soot particle deposits in the area of the quick-closing flap mean that when the quick-closing flaps are actuated, the fresh air supply is not completely interrupted due to deposits and the associated lack of sealing of the fresh air duct, or the flaps are not triggered due to particle deposits in the flap mechanism, which completely prevents the The internal combustion engine cannot therefore be switched off despite the mechanism being triggered. In order to ensure the permanent functionality of the quick-closing flaps, maintenance requirements are therefore often made for corresponding internal combustion engines, which provide for regular manual triggering of the quick-closing flaps, thereby remove any deposits in the area of the flaps. In practice, this has proven to be very complex.

Die Aufgabe der vorliegenden Erfindung ist es, die Wartungsanforderungen zu minimieren.The object of the present invention is to minimize the maintenance requirements.

Die Aufgabe wird erfindungsgemäß dadurch gelöst, dass im Frischluftkanal zur Unterbrechung der Frischluftzufuhr vor einem Zylinderkopf der Brennkraftmaschine eine Schnellschlussklappe angeordnet ist. Die Austrittsöffnung der Abgasrückführung ist dabei zentral im Frischluftkanal und in Strömungsrichtung der Frischluft unter minimaler Spaltbildung vor der Schnellschlussklappe angeordnet. Mit anderen Worten, die Austrittsöffnung der Abgasrückführung und der Klappenteller der Schnellschlussklappe berühren sich in geschlossenem Zustand gerade nicht. Zur Realisierung dieser Anordnung wird für die Zuleitung des Abgasstromes ein Rohrkrümmer verwendet.The object is achieved in that a quick-closing flap is arranged in the fresh air duct to interrupt the fresh air supply in front of a cylinder head of the internal combustion engine. The outlet opening of the exhaust gas recirculation is arranged centrally in the fresh air duct and in the direction of flow of the fresh air with minimal gap formation in front of the quick-closing flap. In other words, the outlet opening of the exhaust gas recirculation and the flap plate of the quick-closing flap do not touch each other in the closed state. To implement this arrangement, a pipe bend is used for the supply of the exhaust gas flow.

Vorteilhaft an der erfindungsgemäßen Anordnung ist, dass die Durchmischung von Abgas- und Frischluftstrom in Strömungsrichtung betrachtet erst hinter der Schnellschlussklappe stattfindet. Zusätzlich wird durch die erfindungsgemäße Anordnung der Abgasrückführung eine sehr homogene Durchmischung von Frischluft und rückgeführtem Abgas bewirkt. Der in den Frischluftstrom eingeleitete Abgasstrom breitet sich im Frischluftkanal ausgehend von der Austrittsöffnung als turbulente Strömung konzentrisch aus, bis er die Wandung des Frischluftkanals erreicht. Die Länge der Strecke bis zum Erreichen der Wandung des Frischluftkanals hängt dabei von den Reynolds-Zahlen der beiden Ströme ab. Durch die unmittelbare Anordnung der Austrittsöffnung des Abgaszuleitungsrohr vor dem Klappenteller der Schnellschlussklappe ist sichergestellt, dass im Bereich des Klappenmechanismus eine Ablagerung der im Abgas enthaltenen Rußpartikel nicht stattfindet. Hierdurch ist die ständige Funktionsbereitschaft des Klappenmechanismus gewährleistet, wodurch die Wartungsanforderung einer regelmäßig manuellen Betätigung der Schnellschlussklappe entfällt.An advantage of the arrangement according to the invention is that the mixing of exhaust gas and fresh air flows, viewed in the direction of flow, only takes place behind the quick-closing flap. In addition, the inventive arrangement of the exhaust gas recirculation results in a very homogeneous mixing of fresh air and recirculated exhaust gas. The exhaust gas flow introduced into the fresh air flow concentrically spreads out in the fresh air duct from the outlet opening as a turbulent flow until it reaches the wall of the fresh air duct. The length of the route until the wall of the fresh air duct is reached depends on the Reynolds numbers of the two streams. The direct arrangement of the outlet opening of the exhaust gas supply pipe in front of the flap plate of the quick-closing flap ensures that the soot particles contained in the exhaust gas are not deposited in the region of the flap mechanism. This ensures that the flap mechanism is always ready for operation, eliminating the need for regular manual operation of the quick-closing flap.

Einzelheiten der Erfindung werden anhand der nachfolgenden Zeichnung erläutert. Diese zeigt:

Fig. 1
einen Frischluftkanal mit Schnellschlussklappe und als Rohrkrümmer ausgeführtem Abgaszuleitungsrohr.
Details of the invention are explained with reference to the following drawing. This shows:
Fig. 1
a fresh air duct with a quick-closing flap and an exhaust gas supply pipe designed as a pipe bend.

In Fig. 1 ist ein Frischluftkanal 1 einer Brennkraftmaschine dargestellt. In Zeichnungsrichtung betrachtet, strömt die zur Verbrennung benötigte Frischluft von oben nach unten in den Frischluftkanal 1, Bezugszeichen EIN. Im Frischluftkanal 1 befindet sich eine Schnellschlussklappe 4, die der Unterbrechung des Frischluftstromes dient, um ein schnelles Abschalten der Brennkraftmaschine zu ermöglichen. Die Schnellschlußklappe 4 umfasst einen Schnellschlussklappenmechanismus 7 und einen Klappenteller 6. Das Schließen der Schnellschlussklappe 4 erfolgt bei Bedarf durch Auslösen des Schnellschlussklappenmechanismus 7. Unmittelbar vor dem Klappenteller 6 der Schnellschlussklappe 4 befindet sich zentral im Frischluftkanal 1 die Austrittsöffnung 2 der Abgasrückführung 3. Unmittelbar ist erfindungsgemäß so zu verstehen, dass die Austrittsöffnung 2 der Abgasrückführung 3 unter minimaler Spaltbildung vor dem Klappenteller 6 der Schnellschlussklappe 4 angeordnet ist, so dass sich die Austrittsöffnung 2 und der Klappenteller 6 bei geschlossener Schnellschlussklappe 4 gerade nicht berühren. Die zentrale Anordnung der Austrittsöffnung 2 im Frischluftkanal 1 ist notwendig, um einerseits eine möglichst homogene Durchmischung der beiden Gase zu erzielen und andererseits, um die Strecke bis zum Erreichen der inneren Wandung der im Abgas enthaltenen Rußpartikel möglichst groß zu gestalten. Zur zentralen Anordnung der Austrittsstelle 2 im Frischluftkanal 1 ist die Abgasrückführung 3 als Rohrkrümmer 5 ausgestaltet.In Fig. 1 A fresh air duct 1 of an internal combustion engine is shown. When viewed in the direction of the drawing, the fresh air required for combustion flows from top to bottom into the fresh air duct 1, reference symbol ON. In the fresh air duct 1 there is a quick-closing flap 4 which serves to interrupt the fresh air flow in order to enable the internal combustion engine to be switched off quickly. The quick-closing flap 4 comprises a quick-closing flap mechanism 7 and a flap plate 6. The quick-closing flap 4 is closed if necessary by triggering the quick-closing flap mechanism 7. Immediately in front of the flap plate 6 of the quick-closing flap 4, the outlet opening 2 of the exhaust gas recirculation 3 is located centrally in the fresh air duct 1 to be understood in such a way that the outlet opening 2 of the exhaust gas recirculation 3 is arranged in front of the flap plate 6 of the quick-closing flap 4 with minimal gap formation, so that the outlet opening 2 and the flap plate 6 do not just touch when the quick-closing flap 4 is closed. The central arrangement of the outlet opening 2 in the fresh air duct 1 is necessary, on the one hand, to achieve the most homogeneous possible mixing of the two gases and, on the other hand, to make the distance as large as possible until the inner wall of the soot particles contained in the exhaust gas is reached. For the central arrangement of the outlet point 2 in the fresh air duct 1, the exhaust gas recirculation 3 is designed as a pipe bend 5.

Mit Hilfe der Abgasrückführung 3 wird der Frischluft ein Teil des bei der Verbrennung entstehenden Abgases zugeführt. Ausgehend von der Austrittsöffnung 2 der Abgasrückführung 3 breitet sich das in die Frischluft einströmende Abgas unter turbulenten Strömungsverhältnissen konzentrisch aus. Die im Abgas enthaltenen Rußpartikel erreichen die innere Wandung des Frischluftkanals 1 in Strömungsrichtung betrachtet somit erst weit hinter der Schnellschlussklappe 4. Eine Ablagerung der Rußpartikel im Bereich der Schnellschlussklappe 4 wird hierdurch wirksam unterbunden. Die Strömung des Abgases im Frischluftkanal 1 ist in Fig. 1 ausgehend von der Austrittsstelle 2 der Abgasrückführung 3 als gestrichelter Stromfaden 8 eingezeichnet, um die Strömungsrichtung im Frischluftkanal darzustellen. Nach vollständiger Durchmischung von Abgas und Frischluft verlässt das Gasgemisch den Frischluftkanal 1 schließlich in Zeichnungsrichtung betrachtet nach rechts in Richtung Brennraum, Bezugszeichen AUS.With the help of the exhaust gas recirculation 3, part of the exhaust gas generated during combustion is supplied to the fresh air. Starting from the outlet opening 2 of the exhaust gas recirculation 3, the exhaust gas flowing into the fresh air concentrically spreads out under turbulent flow conditions. The soot particles contained in the exhaust gas thus only reach the inner wall of the fresh air duct 1 in the flow direction, far behind the quick-closing flap 4. A deposit of the soot particles in the area of the quick-closing flap 4 is thereby effectively prevented. The flow of the exhaust gas in the fresh air duct 1 is in Fig. 1 Starting from the exit point 2 of the exhaust gas recirculation 3, it is drawn in as a dashed flow thread 8 in order to represent the direction of flow in the fresh air duct. After complete mixing of the exhaust gas and fresh air, the gas mixture finally leaves the fresh air duct 1, viewed in the drawing direction, to the right in the direction of the combustion chamber, reference symbol OFF.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
FrischluftkanalFresh air duct
22
Austrittsöffnungoutlet opening
33
AbgasrückführungExhaust gas recirculation
44
SchnellschlussklappeQuick-closing flap
55
Rohrkrümmerelbow
66
Klappentellerflap plate
77
SchnellschlussklappenmechanismusSafe shutters mechanism
88th
Stromfadencurrent thread

Claims (2)

  1. Feeding arrangement for the introduction of recirculated exhaust gas into the fresh-air duct (1) of an internal combustion engine, having a fresh-air duct (1) and an exhaust-gas recirculation arrangement (3) with an outlet opening (2), characterized in that, in the fresh-air duct (1), for the purpose of interrupting the supply of fresh air, a quick-closing valve (4) is arranged upstream of a cylinder head of the internal combustion engine, and the outlet opening (2) of the exhaust-gas recirculation arrangement (3) is arranged centrally in the fresh-air duct (1) and, with minimum gap formation, upstream of the quick-closing valve (4) in the flow direction of the fresh air.
  2. Feeding arrangement according to Claim 1, characterized in that an elbow (5) is used for the introduction of the exhaust gas into the combustion air.
EP17709353.1A 2016-03-11 2017-03-06 Feeding arrangement for introducing recirculated exhaust gas Active EP3426901B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016003003.8A DE102016003003B4 (en) 2016-03-11 2016-03-11 Feed arrangement for the introduction of recirculated exhaust gas
PCT/EP2017/000295 WO2017153042A1 (en) 2016-03-11 2017-03-06 Feeding arrangement for introducing recirculated exhaust gas

Publications (2)

Publication Number Publication Date
EP3426901A1 EP3426901A1 (en) 2019-01-16
EP3426901B1 true EP3426901B1 (en) 2019-12-18

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US (1) US10495034B2 (en)
EP (1) EP3426901B1 (en)
CN (1) CN109072785B (en)
DE (1) DE102016003003B4 (en)
RU (1) RU2700845C1 (en)
WO (1) WO2017153042A1 (en)

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Also Published As

Publication number Publication date
WO2017153042A1 (en) 2017-09-14
US20180223776A1 (en) 2018-08-09
US10495034B2 (en) 2019-12-03
DE102016003003B4 (en) 2017-10-12
CN109072785A (en) 2018-12-21
DE102016003003A1 (en) 2017-09-14
EP3426901A1 (en) 2019-01-16
CN109072785B (en) 2021-07-16
RU2700845C1 (en) 2019-09-23

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