EP2069634A1 - Heat exchanger for gases, in particular for the exhaust gases of an engine - Google Patents
Heat exchanger for gases, in particular for the exhaust gases of an engineInfo
- Publication number
- EP2069634A1 EP2069634A1 EP07820300A EP07820300A EP2069634A1 EP 2069634 A1 EP2069634 A1 EP 2069634A1 EP 07820300 A EP07820300 A EP 07820300A EP 07820300 A EP07820300 A EP 07820300A EP 2069634 A1 EP2069634 A1 EP 2069634A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- exchanger
- gases
- section
- 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.)
- Granted
Links
- 239000007789 gas Substances 0.000 title claims abstract description 54
- 230000007423 decrease Effects 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 239000012809 cooling fluid Substances 0.000 claims description 3
- 239000000110 cooling liquid Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000002826 coolant Substances 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
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 an EGRC or Exhaust Gas Recycling Cooler installed in the EGR system loop, in order to improve the exhaust air flow. system efficiency.
- 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 gases 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 under 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 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.
- 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 1 exchanger.
- the gas heat exchanger in particular for the exhaust gas of an engine, object 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 1 along an axial axis X, which optimizes the volume of space of 1 exchanger.
- the exchanger according to the present invention presents the following advantages:
- An optimization of the size of the exchanger is achieved by facilitating the integration of the other components of the engine, since the volume of the gas inlet and outlet tanks decreases, as that of the carcass of the valve by- pass.
- the cross section of the at least one end of the bypass duct decreases progressively in the radial direction along the axis Z along the axial axis X, said cross section increasing in contrast along the radial axis. 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 the outlet of a carcass of the exchanger and a connection for the assembly of the tank to the recirculation line of the exhaust gas.
- FIG. 1 is a perspective view of a heat exchanger provided with an external bypass duct according to the invention
- FIG. 2 is a schematic view in longitudinal section of the exchanger, with an external bypass duct according to a first embodiment of FIG.
- FIG. 3 is a perspective view of external bypass conduit according to the first embodiment
- Figure 4 is an elevational view of the bypass conduit of Figure 3
- Figure 5 is a side view of the bypass duct of Figure 3
- FIG. 6 is a schematic view in longitudinal section of the exchanger, with an external bypass duct according to a second embodiment of the invention.
- FIGS. 1 to 5 A first embodiment of the invention appears in FIGS. 1 to 5.
- the heat exchanger 1 of the EGR type comprises two independent circuits: a circuit intended for the passage of the gases to be cooled (tube bundle) parallel or stacked plates ⁇ arranged in a carcass 2, and a bypass duct 3 external to said casing 2 of 1 exchanger.
- the exchanger 1 may comprise a plurality of parallel tubes intended 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 intended 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 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 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 pipe 5 through an inlet tank 6, which is coupled to the carcass 2 of the
- 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
- the cross-section of the at least one end of the bypass duct 3 gradually changes from a substantially circular section to a substantially oval section.
- the at least one end of the bypass duct 3 is centered on the axial axis X of said duct 3.
- FIG. 6 A second embodiment of the invention appears in FIG. 6.
- the exchanger la comprises the same elements bearing the references 2 to 9 as the first embodiment. The difference is that the at least one end 10a of the by-pass 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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES200602392A ES2321783B1 (en) | 2006-09-21 | 2006-09-21 | HEAT EXCHANGER FOR GASES, ESPECIALLY OF EXHAUST GASES OF AN ENGINE. |
PCT/EP2007/059843 WO2008034822A1 (en) | 2006-09-21 | 2007-09-18 | Heat exchanger for gases, in particular for the exhaust gases of an engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2069634A1 true EP2069634A1 (en) | 2009-06-17 |
EP2069634B1 EP2069634B1 (en) | 2011-03-23 |
Family
ID=38776680
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07820300A Active EP2069634B1 (en) | 2006-09-21 | 2007-09-18 | Heat exchanger for gases, in particular for the exhaust gases of an engine |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2069634B1 (en) |
AT (1) | ATE503101T1 (en) |
DE (1) | DE602007013427D1 (en) |
ES (2) | ES2321783B1 (en) |
WO (1) | WO2008034822A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT2744U3 (en) * | 1997-12-16 | 1999-06-25 | Avl List Gmbh | EXHAUST GAS RECIRCULATION SYSTEM FOR AN INTERNAL COMBUSTION ENGINE |
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 |
WO2003060314A1 (en) * | 2002-01-16 | 2003-07-24 | Mitsubishi Denki Kabushiki Kaisha | Exhaust gas recirculating device |
ES2209618B1 (en) * | 2002-05-28 | 2005-08-16 | Estampaciones Noroeste, S.A. | HEAT EXCHANGER FOR AN "EGR" SYSTEM WITH AN INTEGRATED DERIVATION CONDUCT. |
DE102004048338C5 (en) * | 2004-10-01 | 2015-11-19 | Eberspächer Exhaust Technology GmbH & Co. KG | Internal combustion engine |
-
2006
- 2006-09-21 ES ES200602392A patent/ES2321783B1/en active Active
-
2007
- 2007-09-18 AT AT07820300T patent/ATE503101T1/en not_active IP Right Cessation
- 2007-09-18 ES ES07820300T patent/ES2361445T3/en active Active
- 2007-09-18 WO PCT/EP2007/059843 patent/WO2008034822A1/en active Application Filing
- 2007-09-18 EP EP07820300A patent/EP2069634B1/en active Active
- 2007-09-18 DE DE602007013427T patent/DE602007013427D1/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2008034822A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP2069634B1 (en) | 2011-03-23 |
ES2361445T3 (en) | 2011-06-17 |
WO2008034822A1 (en) | 2008-03-27 |
DE602007013427D1 (en) | 2011-05-05 |
ATE503101T1 (en) | 2011-04-15 |
ES2321783B1 (en) | 2010-01-12 |
ES2321783A1 (en) | 2009-06-10 |
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