WO2018194226A1 - Refroidisseur de rge pourvu d'une zone de pré-refroidissement - Google Patents

Refroidisseur de rge pourvu d'une zone de pré-refroidissement Download PDF

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Publication number
WO2018194226A1
WO2018194226A1 PCT/KR2017/010637 KR2017010637W WO2018194226A1 WO 2018194226 A1 WO2018194226 A1 WO 2018194226A1 KR 2017010637 W KR2017010637 W KR 2017010637W WO 2018194226 A1 WO2018194226 A1 WO 2018194226A1
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WO
WIPO (PCT)
Prior art keywords
gas tube
wave
point
gas
end plate
Prior art date
Application number
PCT/KR2017/010637
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English (en)
Korean (ko)
Inventor
조형근
Original Assignee
주식회사 코렌스
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 주식회사 코렌스 filed Critical 주식회사 코렌스
Publication of WO2018194226A1 publication Critical patent/WO2018194226A1/fr

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    • 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
    • F02M26/29—Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
    • F02M26/32—Liquid-cooled heat exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators

Definitions

  • the present invention relates to an EG cooler that cools exhaust gas introduced into an exhaust gas recirculation system (EGR: Exhaust gas) with cooling water, and more particularly, in order for the exhaust gas to exchange heat with the cooling water. It relates to an EG cooler having a section previously exhaust gas is precooled.
  • EGR exhaust gas recirculation system
  • Exhaust Gas Recirculation is a system in which a part of the exhaust gas is recycled back to the intake system to increase the concentration of CO 2 in the intake air, thereby lowering the temperature of the combustion chamber and thereby reducing the NOx.
  • the mechanism of NOx generation in detail, consists of about 79% nitrogen, 21% oxygen and other trace elements.
  • nitrogen and oxygen do not react with each other, but at high temperature (above about 1450 ° C), they react with each other to form nitrogen oxides (thermal NOx).
  • thermal NOx nitrogen oxides
  • diesel engines generate combustion by compression ignition method, and the compression ratio is getting higher due to the development of the material of the cylinder, thereby increasing the temperature of the combustion chamber.
  • Increasing the combustion chamber temperature increases the efficiency of the thermodynamic engine, but a large amount of nitrogen oxides are generated due to the high temperature.
  • These nitrogen oxides are the main harmful substances that destroy the global environment, causing acid rain, optical smog, respiratory disorders, and the like.
  • the principle of NOx reduction by EZR is to lower the maximum temperature of the combustion chamber by recirculating inert gas (steam, carbon dioxide, etc.), second, to prevent the atmosphere of nitrogen oxide formation by lean combustion, and To reduce the ignition delay and lower the local maximum temperature and pressure in the combustion chamber.
  • inert gas steam, carbon dioxide, etc.
  • EGR the NOx reduction mechanism by EGR has been reported that the reduction of the oxygen concentration is the root cause and the study that the flame temperature decrease is the cause. At this time, no conclusion about which is right is given, but the contribution of NOx reduction in oxygen concentration and flame temperature has recently been reported to be at the same level.
  • EZR is equipped with EZR cooler, which reduces NOx without increasing fuel economy and PM due to stricter diesel emission control, and installs a cooler (cooler) using coolant from the engine. It is a device that can be obtained.
  • the EZR cooler should be cooled to 700 °C to 200 °C, so it must be heat-resistant and must be compactly designed to be installed inside the car. Should be minimized, and condensation is generated from exhaust gas during heat exchange and sulfuric acid is included in the condensate because it is susceptible to corrosion. Since particulate matter (PM) of the exhaust gas can block the inside of the passage, countermeasure against fouling is required.
  • PM particulate matter
  • FIG. 1 is a perspective view of a conventional EZC cooler
  • FIG. 2 is a cross-sectional perspective view of a conventional EZC cooler
  • FIG. 3 is a partial sectional view of a conventional EZC cooler.
  • an EZR cooler in general, includes a body cell 10 including a coolant inlet pipe 11 and a coolant outlet pipe 12 so that the coolant flows in and out, and a plurality of gases installed in the body cell 10 through which exhaust gas flows.
  • a tube 20, a wave fin 30 inserted into the gas tube 20, and an end plate 40 fixing both ends of the plurality of gas tubes 20 are provided as basic components.
  • the wave fin 30 inserted into the gas tube 20 is a component for increasing the heat exchange efficiency by transferring the temperature of the exhaust gas introduced into the gas tube 20 to the side wall of the gas tube 20. Is in contact with the inner surface.
  • the wave fin 30 is installed to fill the entire inner space of the gas tube 20 to maximize the heat exchange efficiency
  • the end of the wave fin 30 (left end in Figure 3) is a gas tube
  • the end plate 40 of the inner space of the 20 is extended to the combined portion. At this time, since the end plate 40 of the gas tube 20 is not mounted in contact with the coolant, the end portion of the gas tube 20 is overheated.
  • the present invention has been proposed to solve the above problems, it is possible to prevent the phenomenon that the inlet side of the gas tube is overheated to prevent the cooling water boiling phenomenon and the thermal stress concentration phenomenon, to maximize the heat exchange amount to exhaust gas cooling
  • An object of the present invention is to provide an EG cooler that can maintain high efficiency.
  • Easy R cooler for achieving the above object is formed in the duct shape of the both sides in the longitudinal direction open the body cell in which the coolant flows out;
  • a plurality of gas tubes mounted in the body cell so as to be spaced apart from the inner surface of the body cell;
  • An end plate coupled to cover the longitudinal end of the body cell and having an opening formed at a central portion thereof in which an end of the gas tube is inserted in a fitting manner;
  • a wave fin inserted into the gas tube to be in contact with the inner surface of the gas tube, the wave fin being mounted such that one longitudinal end thereof faces the inlet of the gas tube. Is located at a point spaced one end in the longitudinal direction from the point at which the end plate is mounted toward the outlet of the gas tube.
  • the separation distance between the longitudinal end of the wave fin and the end plate is set to less than twice the height of the gas tube internal flow path.
  • the plurality of gas tubes are formed in a rectangular tube shape having a width larger than the thickness thereof, and are stacked in the thickness direction, and the upper and lower wave fins have one end in the longitudinal direction from the point where the end plate is mounted. It is located at a point spaced towards the exit.
  • the wave fin further includes an extension portion extending from the longitudinal end toward the inlet of the gas tube and spaced apart from the inner surface of the gas tube.
  • All wave fins are located at a point where the longitudinal end is spaced away from the point at which the end plate is mounted toward the outlet of the gas tube.
  • the extension part is manufactured through a process of cutting the upper and lower one side in the longitudinal direction of the wave fin.
  • the EG cooler according to the present invention can prevent cooling water boiling phenomenon and concentration of heat stress, and maximize the heat exchange rate to maintain high exhaust gas cooling efficiency. have.
  • FIG. 1 is a perspective view of a conventional RG cooler.
  • FIG. 2 is a cross-sectional perspective view of a conventional EZC cooler.
  • FIG 3 is a partial cross-sectional view of a conventional RG cooler.
  • FIG. 4 is a partial cross-sectional view of an EG cooler according to the present invention.
  • Fig. 5 is a partial cross-sectional view of an EZR cooler according to a second embodiment of the present invention.
  • FIG. 6 is a partial cross-sectional view of the third embodiment of an EZR cooler according to the present invention.
  • FIG. 7 is a partial cross-sectional view of the fourth embodiment of an EZR cooler according to the present invention.
  • FIG 8 is an enlarged perspective view of a wave fin included in the fourth embodiment of an EZR cooler according to the present invention.
  • FIG. 4 is a partial cross-sectional view of an EG cooler according to the present invention.
  • the EG cooler according to the present invention is a device for transferring a high temperature exhaust gas with a low temperature cooling water and cooling it to a predetermined level, and then transferring the exhaust gas to an exhaust gas recirculation (EGR) system, as shown in FIG. 4.
  • EGR exhaust gas recirculation
  • a plurality of gas tubes 200 mounted in the body cell 100 to be spaced apart from the inner side of the body cell 100 and the inner surface of the body cell 100 is formed in an open duct shape in both directions in the open duct shape
  • an end plate 400 coupled to cover the longitudinal end of the body cell 100 and having an opening formed at the center of the gas tube 200 in a fitting manner. Is inserted into the inside of the 200 is in contact with the inner surface of the gas tube 200 is mounted so that the longitudinal end (left end in Figure 4) toward the inlet (left end in Figure 4) of the gas tube 200
  • Wave pin 300 is provided as a basic component.
  • the EG cooler according to the present invention is not located at the point where the end plate 400 is mounted at one end in the longitudinal direction of the wave fin 300, but the gas tube from the point at which the end plate 400 is mounted.
  • the biggest feature of the configuration is that it is located at a point spaced toward the exit of 200.
  • the high temperature exhaust gas exhausted from the engine is introduced into the gas tube 200 through an inlet formed at one side (left side in this embodiment) of the gas tube 200, as shown in the conventional EZR cooler shown in FIG. 3.
  • the wave fins 30 are installed throughout the inner space of the gas tube 20, the heat of the exhaust gas flowing into the inlet of the gas tube 20 is transferred to the gas tube 20 as it is riding the wave fins 30.
  • a portion of the gas tube 20 which is not in contact with the cooling water, that is, the portion where the end plate 40 is mounted, is overheated, and thus the water phenomena due to the cooling water boiling and the concentration of thermal stress are frequently generated.
  • the EZR cooler according to the present invention is located at a point spaced at a distance from one end in the longitudinal direction of the wave fin 300 to the rear (more specifically, toward the outlet of the gas tube 200, the right direction in FIG. 4).
  • an empty space A in which the wave fin 300 does not exist is provided at the inlet side of the internal flow path of the gas tube 200, the heat of the exhaust gas introduced into the inlet of the gas tube 200 is empty. While passing through (A), it is not quickly delivered to the gas tube 200, but is rapidly delivered to the gas tube 200 only when the wave fin 300 is mounted.
  • the EG cooler according to the present invention is not heated to a high temperature from the inlet of the gas tube 200 when the exhaust gas flows into the gas tube 200, but is spaced a predetermined distance from the inlet of the gas tube 200. From (more specifically from the point where the longitudinal end of the wave fin 300 is located) is heated to a high temperature, the end plate 400 is mounted to prevent the phenomenon of overheating the site where the coolant is not smoothly contacted, Accordingly, there is an advantage that the problem of component damage due to cooling water boiling and concentration of thermal stress is prevented.
  • the EG cooler according to the present invention is in contact with the wave fin 300 after the exhaust gas is slightly cooled while passing through the empty space A, that is, precooling the empty space A. Since it is used as a section, it is also possible to obtain the effect of reducing the thermal shock applied to the wave fin 300.
  • Fig. 5 is a partial cross-sectional view of an EZR cooler according to a second embodiment of the present invention.
  • the EZR cooler according to the present invention can reduce the cooling water boiling and thermal stress concentration as the size of the empty space (A) used as a pre-cooling section is large, and greatly reduces the thermal shock applied to the wave fin 300 Although it can be obtained, if the size of the empty space (A) is secured too large, the length of the wave fin 300 is shortened by that, there is a problem that the heat exchange amount between the exhaust gas and the cooling water is reduced. Therefore, the separation distance L between the longitudinal end of the wave fin 300 and the end plate 400 is a cross-sectional specification of the gas tube 200 or the flow rate of the exhaust gas, the wave fin 300 and the gas tube 200. It is preferable to select appropriately according to various conditions such as heat transfer coefficient of.
  • the distance L between the longitudinal end of the wave fin 300 and the end plate 400 is preferably set to two times or less of the height H of the inner channel of the gas tube 200.
  • FIG. 6 is a partial cross-sectional view of the third embodiment of an EZR cooler according to the present invention.
  • the plurality of gas tubes 200 included in the present invention are formed in a rectangular tube shape having a width larger than the thickness thereof, and are stacked in the thickness direction (up and down direction in this embodiment), and both ends of the longitudinal direction of all the gas tubes 200 are end portions. It is coupled to penetrate the central portion of the plate 400.
  • the coolant flowing into the body cell 100 is mainly discharged toward the gas tube 200 located in the center, the gas tube 200 located on the uppermost side and the gas tube 200 located on the lowermost side.
  • the cooling water boiling and thermal stress concentration, and the wave fin 300 thermal shock phenomenon may occur frequently.
  • one end in the longitudinal direction of the upper and lower wave fins 300 is spaced toward the outlet of the gas tube 200 from the point where the end plate 400 is mounted.
  • one end of the longitudinal wave fin 300 in the longitudinal direction may be set to be mounted to the point where the end plate 400 is mounted.
  • the cooling water boiling and thermal stress concentration and the wave fin 300 thermal shock phenomenon may occur in the gas tube 200 positioned in the middle, as shown in FIG. It should be set to be located at a point spaced toward the outlet of the gas tube 200.
  • FIG. 7 is a partial cross-sectional view of the fourth embodiment of the IR cooler according to the present invention
  • FIG. 8 is an enlarged perspective view of the wave fin 300 included in the fourth embodiment of the IR cooler according to the present invention.
  • the EG cooler according to the present invention may be configured to increase the contact area between the exhaust gas and the wave fin 300 while reducing the cooling water boiling phenomenon, the thermal stress concentration phenomenon, and the thermal shock phenomenon of the wave fin 300. .
  • the wave fin 300 may include an extension 310 extending from one end in the longitudinal direction toward the inlet of the gas tube 200 as shown in FIGS. 7 and 8. Exhaust gas introduced through the inlet of the gas tube 200 is first contacted with the extension 310 to transfer heat to the wave fin 300, which is directly connected to the gas tube 200. Since it is not in contact with the heat transmitted to the extension 310 is passed through the body of the wave fin 300 is transferred to the gas tube 200. That is, when the extension part 310 is additionally provided in the wave fin 300, the efficiency of transferring the heat of the exhaust gas to the gas tube 200 through the wave fin 300 is increased, and the end of the gas tube 200 is increased. Since the phenomenon in which the plate 400 is mounted is not overheated, it is possible to obtain an effect of improving the cooling performance of the exhaust gas while preventing the cooling water boiling phenomenon, the thermal stress concentration phenomenon, and the wave fin 300 thermal shock phenomenon. do.
  • the end of the extension 310 is preferably located at the point where the end plate is mounted in the inner space of the gas tube 200, as shown in FIG.
  • all the wave fin 300 is one end in the longitudinal direction of the end plate 400 It is preferably set to be located at a point spaced toward the outlet of the gas tube 200 from the mounting point.
  • the shape of the extension portion 310 may be formed in a flat plate shape as shown in this embodiment, or may be formed in a wave plate shape to further widen the contact area with the exhaust gas. That is, the shape of the extension 310 may be variously modified according to various conditions, a detailed description thereof will be omitted.
  • the extension portion 310 in order to manufacture the extension 310 separately to be coupled to one end in the longitudinal direction of the wave fin 300, not only takes a lot of time to manufacture the extension 310, but also takes a long time to combine the extension 310 There is a problem.
  • the extension portion 310 if the extension portion 310 is manufactured separately and then coupled, the extension portion 310 may not be smoothly manufactured, which may interfere with the flow of the exhaust gas.
  • the manufacturer may cut the upper and lower portions of one side in the longitudinal direction of the conventional wave fin 30 shown in FIG. 3 to process the wave fin 300 so that the remaining portion is the extension portion 310.
  • the extension part 310 when the extension part 310 is formed by cutting the upper and lower sides of the wave fin 300 in the longitudinal direction, the extension part 310 may not only be easily manufactured, but also the exhaust gas may be smoothly flown. There is an advantage.
  • the conventional wave fin 30 can be recycled, there is an advantage that can reduce the waste of resources.

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

Abstract

Selon la présente invention, un refroidisseur de RGE comprend : une cellule de corps dont deux côtés, dans la direction longitudinale, sont formés sous la forme de conduits, de sorte que de l'eau de refroidissement puisse y être introduite et en être évacuée ; une pluralité de tubes à gaz, installés à l'intérieur de la cellule de corps de façon à être séparés des surfaces internes de la cellule de corps ; une plaque d'extrémité, accouplée de manière à recouvrir une extrémité longitudinale de la cellule de corps et pourvue d'une ouverture au niveau d'une partie centrale, dans laquelle une extrémité des tubes de gaz est insérée en étant ajustée ; et des ailettes ondulées, insérées à l'intérieur des tubes de gaz pour être en contact avec une surface interne des tubes de gaz, et dont une extrémité, dans le sens de la longueur, est installée de façon à faire face à une entrée sur les tubes de gaz, une extrémité dans le sens de la longueur d'au moins une ailette ondulée parmi la pluralité d'ailettes ondulées étant positionnée au niveau d'un point séparé vers une sortie sur les tubes à gaz, à partir du point où la plaque d'extrémité est installée.
PCT/KR2017/010637 2017-04-17 2017-09-26 Refroidisseur de rge pourvu d'une zone de pré-refroidissement WO2018194226A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020170049204A KR101793198B1 (ko) 2017-04-17 2017-04-17 예냉각 구간을 구비하는 이지알 쿨러
KR10-2017-0049204 2017-04-17

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WO2018194226A1 true WO2018194226A1 (fr) 2018-10-25

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Publication number Priority date Publication date Assignee Title
KR102296661B1 (ko) 2020-02-13 2021-09-02 주식회사 코렌스 예냉각 구간의 내구성이 개선된 이지알쿨러용 가스튜브

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100814071B1 (ko) * 2007-02-28 2008-03-14 주식회사 코렌스 이지알 쿨러
KR100895483B1 (ko) * 2005-09-09 2009-05-06 우수이 고쿠사이 산교 가부시키가이샤 열교환기용 전열관
KR20090104163A (ko) * 2008-03-31 2009-10-06 주식회사 코렌스 자동차용 이지알 쿨러
JP4354586B2 (ja) * 1999-09-29 2009-10-28 株式会社ティラド 排気ガス用熱交換器
JP4622150B2 (ja) * 2001-04-26 2011-02-02 株式会社デンソー 熱交換器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4354586B2 (ja) * 1999-09-29 2009-10-28 株式会社ティラド 排気ガス用熱交換器
JP4622150B2 (ja) * 2001-04-26 2011-02-02 株式会社デンソー 熱交換器
KR100895483B1 (ko) * 2005-09-09 2009-05-06 우수이 고쿠사이 산교 가부시키가이샤 열교환기용 전열관
KR100814071B1 (ko) * 2007-02-28 2008-03-14 주식회사 코렌스 이지알 쿨러
KR20090104163A (ko) * 2008-03-31 2009-10-06 주식회사 코렌스 자동차용 이지알 쿨러

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