EP2069634B1 - Wärmetauscher für gase, im besonderen für motorabgase - Google Patents

Wärmetauscher für gase, im besonderen für motorabgase Download PDF

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Publication number
EP2069634B1
EP2069634B1 EP07820300A EP07820300A EP2069634B1 EP 2069634 B1 EP2069634 B1 EP 2069634B1 EP 07820300 A EP07820300 A EP 07820300A EP 07820300 A EP07820300 A EP 07820300A EP 2069634 B1 EP2069634 B1 EP 2069634B1
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EP
European Patent Office
Prior art keywords
exchanger
section
gases
bypass duct
duct
Prior art date
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.)
Active
Application number
EP07820300A
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English (en)
French (fr)
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EP2069634A1 (de
Inventor
Silvia Guillen
Yolanda Blanes
Jorge Garcia-Marques
José Luis GARCIA BERNAD
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Termico SA
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Valeo Termico SA
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Classifications

    • 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
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/25—Layout, e.g. schematics with coolers having bypasses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D21/0001—Recuperative heat exchangers
    • F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases

Definitions

  • the present invention relates to a heat exchanger for gas, in particular for the exhaust gases of an engine. It particularly relates to heat exchangers that include an integrated external bypass duct.
  • the invention applies in particular to exhaust gas recirculation exchangers of an engine (Exhaust Gas Recirculation Coolers or EGRC); exhaust gas exchangers for the thermal regulation of the exhaust line of direct injection gasoline engines (Exhaust Thermal Regulation or ETR); and charge air coolers or intercoolers (Charge Air Coolers or CAC).
  • EGRC exhaust Gas Recirculation Coolers
  • ETR exhaust Thermal Regulation
  • CAC Charge Air Coolers
  • a well-established practice in the automotive sector is to provide a diesel engine exhaust gas recirculation system, known as EGR or Exhaust Gas Recycling, to blend these gases to the intake air, since the presence of the exhaust gases in the mixture decreases the production of nitrogen oxides (NOx).
  • EGR diesel engine exhaust gas recirculation system
  • Exhaust Gas Recycling Exhaust Gas Recycling
  • the exhaust gases Before mixing with the intake air, the exhaust gases can be cooled in a heat exchanger (EGRC or "Exhaust Gas Recycling Cooler”) installed in the loop of the EGR system, with the aim of improving the system efficiency.
  • EGRC Exhaust Gas Recycling Cooler
  • EGR valve In the system loop there is also a valve (EGR valve) which controls the passage of exhaust gases therethrough.
  • the heat exchanger itself may have different configurations: for example, it may consist of a tubular carcass inside which there is a series of parallel tubes for the passage of gases, the refrigerant circulating in the carcass outside the tubes; in another embodiment, the exchanger consists of a series of parallel plates which constitute the heat exchange surfaces, so that the exhaust gas and the refrigerant circulate between two plates in alternating layers.
  • the heat exchangers comprise at least one tank and / or a flange or independent connection, by means of which it is connected to the exhaust gas recirculation line.
  • said exchangers comprise an inlet reservoir and an outlet reservoir, said reservoirs being respectively coupled to the inlet and outlet ducts of the recirculation line each by means of an independent connection.
  • the cooled EGR systems have the disadvantage that the exhaust gases circulate in the exchanger in any operating condition of the engine from the moment the EGR valve opens: the gases are cooled as well. good when the engine is operating in steady state and its temperature is high than during a cold start, when the temperature of the gases is much lower.
  • At least one bypass duct is used, integrated in the exchanger and able to circulate the exhaust gas without undergoing substantial cooling.
  • the bypass duct that can be called simply by-pass, allows to minimize the cooling of the exhaust gas in certain operating circumstances of the engine, for example a cold start, in which their temperature is not high and their cooling would be detrimental to the emission of pollutants.
  • the system may include a regulating or bypass valve that selects the exhaust path, through the exchanger or through the bypass duct.
  • Said regulating valve may be located at the inlet or at the outlet of the exchanger.
  • Said bypass duct can be integrated inside or outside.
  • An internal bypass is located inside the shell of the exchanger and is surrounded by the coolant. The power losses during the bypass mode are greater than for an external bypass.
  • bypass ducts may include an area with corrugations for absorbing thermal expansions.
  • An example of such an exchanger with these characteristics is presented in the document WO 02/10574 .
  • Circular section conduit is known to be the best option for minimizing heat loss during bypass operation.
  • the bypass duct in the EGR exchangers involves a volume important in the engine environment.
  • One of the main restrictions on the design of the bypass duct arises from the zones with external corrugations of the duct, intended to avoid thermal shock, which involve a large additional volume.
  • a flat duct of oval section is the best solution in terms of size, but at present it is not possible to achieve areas with corrugations in a flat duct. This is why there is no flat external bypass duct since the problem of thermal shock would not be solved.
  • the purpose of the gas heat exchanger in particular for the exhaust gases of an engine according to the present invention, is to overcome the drawbacks that the exchangers known in the art present by proposing an external bypass duct. simple structural design that allows to optimize the volume of space of the exchanger.
  • the gas heat exchanger in particular for the exhaust gases of an engine, which is the subject of the present invention, is of the type which comprises a circuit intended for the circulation of gases with heat exchange with a cooling fluid and a conduit external bypass, adapted to circulate the gases without undergoing substantial cooling, and it is characterized in that the cross section of at least one end of the bypass duct gradually decreases in at least one radial direction following a Y or Z axis, along an axial axis X, which optimizes the volume of space of the exchanger.
  • the cross section of the at least one end of the bypass duct gradually decreases in the radial direction along the Z axis along the axial axis X, said transverse section increasing along the radial axis, for example. Y, so that substantially the same cross section of gas passage in the entire bypass conduit is retained.
  • the cross section of the at least one end of the bypass duct passes progressively from a substantially circular section to a substantially oval section.
  • the at least one end of the bypass duct is centered on the axial axis X of said duct.
  • the at least one end of the bypass duct is off-center with respect to the axial axis X of said duct.
  • the exchanger comprises a control valve for the choice of the circuit through which the gases circulate.
  • the exchanger comprises a tank assembled at the inlet or outlet of a carcass of the exchanger and a connection for assembling the tank at the exhaust gas recirculation line.
  • a first embodiment of the invention appears on the Figures 1 to 5 .
  • the heat exchanger 1 type EGR comprises two independent circuits: a circuit for the passage of the gases to be cooled (bundle of parallel tubes or stacked plates) arranged in a carcass 2, and a bypass duct 3 external to said carcass 2 of the exchanger.
  • the exchanger 1 may comprise a plurality of parallel tubes for the passage of the gases to be cooled, the refrigerant circulating inside the carcass 2 outside said tubes; or, in a second variant, the exchanger 1 may comprise a series of parallel plates which constitute the heat exchange surfaces, so that the exhaust gases and the refrigerant circulate between two plates in alternating layers.
  • Said bypass duct 3 comprises a central zone provided with corrugations 4 designed to absorb the thermal expansions.
  • the exchanger 1 further comprises a control valve (not shown) which regulates the path through which the gas flow passes through the exchanger 1, that is to say, either through the tube bundle or the corresponding plates or, preferably, through the bypass duct 3, depending on the temperature of the exhaust gas.
  • a control valve (not shown) which regulates the path through which the gas flow passes through the exchanger 1, that is to say, either through the tube bundle or the corresponding plates or, preferably, through the bypass duct 3, depending on the temperature of the exhaust gas.
  • the gases to be cooled enter the exchanger 1 from a supply duct 5 through an inlet tank 6, which is coupled to the casing 2 of the exchanger 1. They pass through the tube bundle or the plates corresponding, or by the bypass duct 3, the gas out through an outlet coupled to a collar 7 located at the other end of the exchanger 1, which will lead to the intake manifold.
  • the cooling fluid circulates inside the carcass 2, either outside the tubes or between the corresponding plates stacked as mentioned above, between a fluid inlet 8 and an outlet 9 .
  • the cross section of the at least one end 10 of the bypass duct 3 decreases progressively in the radial direction along the axis Z along the axial axis X, said transverse section increasing along the radial axis Y , so that substantially the same cross section of gas passage in the entire bypass duct 3 is retained.
  • the at least one end 10 of the bypass duct 3 has a lower height along the Z axis, it is possible to reduce the size of the exchanger, at the same time as avoids the effects of thermal shock by including in said bypass duct 3 an area with corrugations 4 in its section of circular section.
  • the cross section of the at least one end 10 of the bypass duct 3 passes gradually from a substantially circular section to a substantially oval section.
  • the at least one end 10 of the bypass duct 3 is centered on the axial axis x of said duct 3.
  • a second embodiment of the invention appears on the figure 6 .
  • the exchanger understands the same. elements bearing references 2 to 9 as the first embodiment.
  • the difference is that the at least one end 10a of the bypass duct 3 is off-center with respect to the axial axis X of said duct 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Exhaust-Gas Circulating Devices (AREA)
  • Gas Separation By Absorption (AREA)

Claims (7)

  1. Wärmeaustauscher (1, 1a) für Gas, insbesondere für die Abgase eines Motors, der einen Kreislauf, der für den Durchfluss der Gase mit Wärmeaustausch mit einem Kühlmittel bestimmt ist, und einen äußeren Bypass-Kanal (3) enthält, der fähig ist, die Gase strömen zu lassen, ohne dass sie eine wesentliche Kühlung erfahren, dadurch gekennzeichnet, dass der Querschnitt mindestens eines Endes (10, 10a) des Bypass-Kanals (3) in mindestens einer radialen Richtung gemäß einer Achse Y oder Z entlang einer axialen Achse X progressiv abnimmt, was das Außenvolumen des Austauschers (1, 1a) optimiert.
  2. Austauscher (1) nach Anspruch 1, dadurch gekennzeichnet, dass der Querschnitt des mindestens einen Endes (10, 10a) des Bypass-Kanals (3) in der radialen Richtung gemäß der Achse Z entlang der axialen Achse X progressiv abnimmt, wobei der Querschnitt dagegen gemäß der radialen Achse Y zunimmt, so dass in der Gesamtheit des Bypass-Kanals (3) im Wesentlichen der gleiche Gasdurchgangsquerschnitt beibehalten wird.
  3. Austauscher (1) nach Anspruch 2, dadurch gekennzeichnet, dass der Querschnitt des mindestens einen Endes (10, 10a) des Bypass-Kanals (3) progressiv von einem im Wesentlichen kreisförmigen Querschnitt zu einem im Wesentlichen ovalen Querschnitt übergeht.
  4. Austauscher (1) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das mindestens eine Ende (10) des Bypass-Kanals (3) auf die axiale Achse X des Kanals (3) zentriert ist.
  5. Austauscher (1a) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass das mindestens eine Ende (10a) des Bypass-Kanals (3) bezüglich der axialen Achse X des Kanals (3) außermittig ist.
  6. Austauscher (1, 1a) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass er ein Regelventil für die Wahl des Kreislaufs enthält, durch den die Gase strömen.
  7. Austauscher (1, 1a) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass er einen Behälter (6), der an den Eingang oder an den Ausgang eines Gehäuses (2) des Austauschers (1, 1a) montiert ist, und eine Verbindung für den Zusammenbau des Behälters (6) mit der AbgasRückführleitung enthält.
EP07820300A 2006-09-21 2007-09-18 Wärmetauscher für gase, im besonderen für motorabgase Active EP2069634B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200602392A ES2321783B1 (es) 2006-09-21 2006-09-21 Intercambiador de calor para gases, en especial de los gases de escape de un motor.
PCT/EP2007/059843 WO2008034822A1 (fr) 2006-09-21 2007-09-18 Echangeur thermique pour gaz, en particulier pour les gaz d'echappement d'un moteur

Publications (2)

Publication Number Publication Date
EP2069634A1 EP2069634A1 (de) 2009-06-17
EP2069634B1 true EP2069634B1 (de) 2011-03-23

Family

ID=38776680

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07820300A Active EP2069634B1 (de) 2006-09-21 2007-09-18 Wärmetauscher für gase, im besonderen für motorabgase

Country Status (5)

Country Link
EP (1) EP2069634B1 (de)
AT (1) ATE503101T1 (de)
DE (1) DE602007013427D1 (de)
ES (2) ES2321783B1 (de)
WO (1) WO2008034822A1 (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT2744U3 (de) * 1997-12-16 1999-06-25 Avl List Gmbh Abgasrückführsystem für eine brennkraftmaschine
US6511204B2 (en) * 1999-12-16 2003-01-28 3M Innovative Properties Company Light tube
GB0018406D0 (en) * 2000-07-28 2000-09-13 Serck Heat Transfer Limited EGR bypass tube cooler
US6976480B2 (en) * 2002-01-16 2005-12-20 Mitsubishi Denki Kabushiki Kaisha Exhaust gas recirculating device
ES2209618B1 (es) * 2002-05-28 2005-08-16 Estampaciones Noroeste, S.A. Intercambiador de calor para un sistema "egr" con un conducto de derivacion integrado.
DE102004048338C5 (de) * 2004-10-01 2015-11-19 Eberspächer Exhaust Technology GmbH & Co. KG Brennkraftmaschine

Also Published As

Publication number Publication date
ES2321783A1 (es) 2009-06-10
ATE503101T1 (de) 2011-04-15
ES2321783B1 (es) 2010-01-12
EP2069634A1 (de) 2009-06-17
DE602007013427D1 (de) 2011-05-05
ES2361445T3 (es) 2011-06-17
WO2008034822A1 (fr) 2008-03-27

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