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WO1998004814A1 - Dispositif pour conduire un flux massique de gaz d'echappement et/ou pour loger un corps support de catalyseur - Google Patents

Dispositif pour conduire un flux massique de gaz d'echappement et/ou pour loger un corps support de catalyseur Download PDF

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Publication number
WO1998004814A1
WO1998004814A1 PCT/EP1997/003524 EP9703524W WO9804814A1 WO 1998004814 A1 WO1998004814 A1 WO 1998004814A1 EP 9703524 W EP9703524 W EP 9703524W WO 9804814 A1 WO9804814 A1 WO 9804814A1
Authority
WO
WIPO (PCT)
Prior art keywords
gap
inner jacket
vorrichmng
cooling medium
combustion engine
Prior art date
Application number
PCT/EP1997/003524
Other languages
German (de)
English (en)
Inventor
Rolf BRÜCK
Peter Hirth
Wolfgang Maus
Original Assignee
Emitec Gesellschaft Für Emissionstechnologie Mbh
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 Emitec Gesellschaft Für Emissionstechnologie Mbh filed Critical Emitec Gesellschaft Für Emissionstechnologie Mbh
Priority to AU34430/97A priority Critical patent/AU3443097A/en
Publication of WO1998004814A1 publication Critical patent/WO1998004814A1/fr

Links

Classifications

    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2046—Periodically cooling catalytic reactors
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
    • F01N13/14—Exhaust or silencing apparatus characterised by constructional features having thermal insulation
    • 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
    • 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
    • F01N3/05—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 air, e.g. by mixing exhaust with air
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2839—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration
    • F01N3/2853—Arrangements for mounting catalyst support in housing, e.g. with means for compensating thermal expansion or vibration using mats or gaskets between catalyst body and housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/20—Cooling circuits not specific to a single part of engine or machine
    • 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
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F01N13/10—Other arrangements or adaptations of exhaust conduits of exhaust manifolds
    • 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
    • F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
    • F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
    • F01N2260/022—Exhaust treating devices having provisions not otherwise provided for for cooling the device using air
    • 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
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/02—Exhaust treating devices having provisions not otherwise provided for for cooling the device
    • F01N2260/024—Exhaust treating devices having provisions not otherwise provided for for cooling the device using a liquid
    • 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
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/30—Arrangements for supply of additional air
    • F01N3/32—Arrangements for supply of additional air using air pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/44—Outlet manifold temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature
    • F01P2025/46—Engine parts temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2060/00—Cooling circuits using auxiliaries
    • F01P2060/16—Outlet manifold
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a device for directing an exhaust gas mass flow, in particular from an internal combustion engine, and / or for accommodating a catalyst carrier body according to the preamble of claim 1.
  • a catalyst carrier body to surround an insulation layer.
  • the G 87 15 289.4 discloses a support body for a catalytic reactor, an elastically deformable and heat-resistant mat which envelops the support body being clamped between the circumference of the honeycomb-shaped support body and a metal tube.
  • WO 96/12876 describes a catalyst carrier body in which external channels of the free flow cross section are closed by beads. These channels form thermal insulation from the channels of the catalyst carrier body located further inside.
  • DE 44 45 557 AI describes a double-walled housing for exhaust gas catalysts, the inner jacket being arranged in the outer one. This outer jacket is deformed in places over the entire circumference inwards towards the inner jacket. This creates spaces between the inner shell and the outer shell, which have an insulating effect.
  • a device for directing an exhaust gas mass flow which has a cooling device for a catalytically active exhaust gas arranged in the exhaust system of an internal combustion engine. verter contains.
  • This cooling device is formed in that a gap is formed between a catalyst carrier body and a housing surrounding the catalyst carrier body, through which a cooling air can flow.
  • a corrugated metal foil is arranged in the gap.
  • Such a cooling device is intended to ensure that the catalytically active converter is not destroyed by excessively high temperatures.
  • the object of the invention is to develop a device of the type mentioned in the introduction so that the thermal behavior of the device is improved.
  • a main area of application of a device according to the invention for directing an exhaust gas mass flow is in the area of motor vehicles with an internal combustion engine.
  • the device is part of an exhaust line of the combustion motors of the motor vehicle.
  • the exhaust line is defined in particular as lines which discharge an exhaust gas mass flow from the internal combustion engine.
  • This includes elbows along with flanges and connections, pipe sections, but also housings for catalyst carrier bodies and silencers.
  • a catalytic converter which is still a heat sink at the beginning of the cold start, but later becomes a heat source due to the exothermic reactions which it causes, can be cooled by means of the device according to the invention.
  • the invention makes it possible to arrange the internal combustion engine together with the exhaust line and catalytic converter, as well as other devices that function as a heat source, compactly and in close proximity to one another in the engine compartment. While in the prior art alone the internal combustion engine heat is dissipated via a suitable cooling circuit by means of the airstream, according to the invention, the targeted guiding of a cooling medium in the first gap also makes this possible at other thermally critical points in the exhaust line.
  • the first gap has an inlet opening and an outlet opening and is designed in such a way that a cooling medium is guided from the inlet opening to the outlet opening.
  • the first gap extends at least in a section in a ring around the circumference of the inner jacket. This allows the cooling medium to flow around the entire circumference of the inner jacket. The heat to be dissipated is then also removed in its entirety.
  • Ring-shaped means in particular a closed section with different geometries around the circumference.
  • Body geometries other than annular, for example oval or conical, are also covered in the section on the entire circumference by the outer jacket to form the first gap.
  • the gap geometry as such can also change in a further embodiment, for example by reducing or increasing the Distance of the inner jacket to the outer jacket. In this way, the cooling medium can be accelerated or slowed down at suitable points, depending on the desired design of the device.
  • the inlet opening and the outlet opening can be arranged at very specifically selected points, areas or partial sections of the gap. This is useful if known heat spots on the line of an exhaust gas mass flow are to be acted upon specifically with the cooling medium.
  • the respective end face of the first gap can also be designed as an inlet or outlet opening.
  • the cooling medium expediently flows around the inner jacket over its entire circumference at the beginning of the first gap, which leads to a uniform cooling of the inner and the outer jacket. Thermal stresses due to different dissipated heat flows over the circumference can thereby be reduced, if not largely avoided, on the inner or outer jacket.
  • the targeted routing of the cooling medium from the inlet opening to the outlet opening in the first gap enables appropriate cooling.
  • the device according to the invention enables cooling of the heat-radiating components running in this encapsulated compartment. In this way, heat build-up or damage to heat-sensitive components, for example motor controls or electronic devices or plastic parts and switches, are reduced or avoided.
  • the device according to the invention has a second gap, which preferably at least partially provides the arrangement of a second gap between the exhaust gas mass flow and the inner jacket.
  • This second The gap serves as an insulator. It prevents or reduces the heat transfer from the exhaust gas mass flow to the first gap.
  • an insulating medium is advantageously provided in the second gap. This insulating medium then has a low heat transfer coefficient.
  • several insulating media can also be arranged in the second gap, as a result of which a thermal stratification can form. Each medium can apply appropriate thermal insulation. If, for example, the second gap is filled with a gas or a vacuum is provided in it, the heat transfer coefficient in the second gap is very small. However, temperatures occur at very hot components such as, for example, the manifold or other exothermic components such as the catalytic converter, at which heat transfer via radiation cannot be neglected.
  • an insulating medium in the second gap which absorbs and / or also diffuses this radiation.
  • a similar effect can also be achieved by introducing an insulating material into the second gap. If ceramic or a ceramic-containing mat is at least partially arranged in the second gap, on the one hand the heat transfer between the exhaust gas mass flow and the outer jacket is considerably reduced, on the other hand the insulating material also has a damping effect on vibrations on the inner jacket or on it closely spaced bodies. If a catalyst carrier body is advantageously accommodated within the jacket, the insulating material is also used simultaneously as a support and damping material for the latter.
  • the supply of the cooling medium to the inlet opening or openings can be produced with a feed body which can be connected to the inlet opening.
  • the cooling medium is in turn discharged via the outlet opening or outlet openings, each advantageously with a corresponding appropriate discharge body with which these can be connected.
  • This enables the cooling medium to be circulated, so that the heat absorbed can be dissipated via suitable cooling devices.
  • a motor vehicle offers convection coolers that are exposed to the wind in the direction of travel.
  • the inlet opening itself can also be arranged in such a way that the airstream enters the first gap in accordance with the respective dynamic pressure and causes cooling by thermal convection.
  • An embodiment of the invention provides that a nozzle is also assigned to the feed body.
  • the acceleration of the cooling medium thus achieved leads to a higher mass flow in the first gap, as a result of which areas which are particularly at risk from heat are cooled.
  • Such a nozzle effect can also be achieved by corresponding diameter reductions in the first gap itself.
  • the supply body for the inlet opening of the first gap in connection with a cooling system of the motor vehicle and / or the Combustion engine brought can be the usual cooling water circuit, but also the circuit of other components.
  • the supply body is also connected to an opening pointing in the main direction of travel of a motor vehicle and / or to a gas routing system, preferably an intake manifold system of the internal combustion engine. This enables further use of quasi-inherent cooling options.
  • the cooling medium itself can be gaseous or liquid and is in particular air or water. In motor vehicles, these two are always available Available, so that a constructive as well as very economical use is possible.
  • the cooling medium is forced to move. This is possible both with a closed cooling circuit of the device and with an open cooling circuit for the cooling medium. Pumps, compressors and / or fans or the like can be used as suitable means. You can force the cooling medium alone only for the device or a cooling medium corresponding to other components to be cooled.
  • a secondary air pump is now used during cold starting in order to meet the relevant exhaust gas regulations. During the rest of the operation, i.e. when the internal combustion engine has reached its operating temperature, the secondary air pump is not used.
  • One embodiment of the invention now provides for the use of the secondary air pump in a device according to the invention. This enables this pump to be used during the entire operation of the internal combustion engine.
  • the secondary air pump can provide appropriate additional air for the internal combustion engine. At this time, cooling by means of the device is not yet necessary. If, on the other hand, the cold start period has been left, the positively moved air flow can be directed to the device and thus to the points to be cooled by appropriate switching means.
  • FIG. 2 shows a catalyst carrier body which is surrounded by an inner and outer jacket with a first and a second gap
  • FIG. 3 an internal combustion engine with a device according to the invention
  • FIG. 4 shows a cross section through a device according to the invention with a catalyst carrier body from FIGS. 3 and
  • Figure 5 shows a further cross section through another device according to the invention.
  • FIG. 1 shows a device according to the invention for directing an exhaust gas mass flow 15.
  • An inner jacket 1 is surrounded by an outer jacket 2.
  • These jackets 1, 2 form a first gap 3 through which a cooling medium 16 is guided from an inlet opening 4 to an outlet opening 5.
  • the direction of flow of the cooling medium 16 is indicated in the figure by the arrows, which are each located at the inlet or outlet opening.
  • the medium 16 absorbs a heat flow from the surface of the inner jacket 1 by convection and removes it.
  • a second gap 6 is arranged between the exhaust gas mass flow 15 and the inner jacket 1.
  • An insulating medium 14, which is arranged in the second gap 6, prevents direct contact between the exhaust gas mass flow 15 and the inner jacket 1.
  • the insulating medium 14 continues to have a small heat transfer coefficient, only relatively little heat is emitted to the outside in the direction of the outer jacket 2 from the exhaust gas mass flow 15.
  • the prevention of direct contact of the exhaust gas mass flow 15 with the inner jacket 1 has the further advantage that the insulating medium 14 offers protection in particular against the occurrence of hot gas corrosion. At temperatures of over 800 ° C in some cases, there is such a risk of hot gas corrosion occurring on metal components encountered by the exhaust gas mass flow 15. This is avoided according to the invention by means of insulating media 14.
  • the choice of material for the inner jacket 1 can then be designed more freely than other solutions without having to accept a loss in durability.
  • FIG. 2 shows a device according to the invention with an inner shell 1, an outer shell 2 and a first gap 3 and a second gap 6.
  • a catalyst carrier body 7 is arranged inside the inner shell 1. This can be made of metal or ceramic. When the catalyst carrier body 7 is in operation, it becomes an exothermic heat source when the ignition temperature is reached. Therefore, the outer jacket 2 preferably at least partially surrounds the inner jacket 1 in the region of the catalyst carrier body 7. This is adapted in the embodiment of the device according to the invention shown in Figure 2 so that the heat flow resulting from the catalytic reaction can be sufficiently dissipated.
  • the first gap 3 has a plurality of identical or differently shaped inlet openings 4 and outlet openings 5.
  • first gap 3 serves as inlet opening 4 or outlet opening 5
  • a further advantageous embodiment of the device is indicated in the form of a channel located in the first gap 3.
  • This channel shown in broken lines in FIG. 2, connects at least one inlet opening 4 to one Outlet opening 5.
  • the channel is formed by corresponding baffles within the first gap 3. These can extend over the entire first gap or only areas thereof.
  • the channel can also open in the direction of the outlet opening 5 in such a way that a plurality of adjacent channels open into an outlet opening 5.
  • a multi-channel design is also possible and is particularly advantageous if the cooling medium 16 is to be selectively applied to various points or sections of the line.
  • the catalyst carrier body 7 is held in the inner jacket 1 by suitable devices in the second gap 6. Suitable mounting points, for example in the form of beads, are suitable for this purpose. A holder and at the same time damping can also be done by a suitable damping material, which expediently also has a heat-insulating property. This holder can be adapted to the respective construction of the catalyst carrier body 7.
  • a temperature sensor 11 is assigned to this. It is arranged so that it can detect one or more temperatures. For example, the temperature of the catalyst carrier body 7 and / or the temperature of the inner jacket 1 are detected. From these temperature values it can be derived directly how the heat flow emitted behaves. This is also possible via the temperature measurement of the outer jacket or the temperature measurement of the cooling medium. When using a plurality of temperature sensors 11, local temperature distributions can also be broken down and evaluated.
  • a temperature sensor 11 can advantageously be designed such that it can record several temperatures of different components such as the inner and the outer jacket at one position.
  • FIG. 3 shows an arrangement with an internal combustion engine 13 and a device according to the invention connected to it.
  • This has one Cooling circuit 12 which is filled with a cooling liquid. The heat is removed from the cooling circuit 12 via a finned cooler 17.
  • a pump 10 is arranged in the cooling circuit 12 and sets the cooling liquid in the cooling circuit 12 in a forced movement.
  • a cooling circuit 18 of a device according to the invention is connected to the cooling circuit 12 of the internal combustion engine.
  • a valve 19 can be opened or closed by a control 21 via a line 20.
  • a temperature sensor 11 is also connected to the control 21, which detects the temperature of the outer jacket 2.
  • the pump 10 is also connected to the controller 21 via a line 20.
  • the controller 21 is now designed so that it can adjust the flow rate and / or the mass flow of the cooling medium, which is supplied via the inlet body 8 and is discharged via the outlet body 9, as a function of the temperature measured by the temperature sensor 11. If the outer jacket 2 reaches a limit temperature, the controller 21 can cause the cooling circuit 18 to be opened and heat to be removed. The effect of opening the cooling circuit 18 can be checked by means of the temperature sensor 11. If a sudden increase in temperature is noticed while heat removal has been sufficient in stationary operation, as occurs, for example, when a trailer is operating in the mountains, the pump and / or the valve 19 can be controlled so that more heat is dissipated.
  • the controller 21 not only receives data from the temperature sensor 11, but also from the internal combustion engine 13 Control 21 a corresponding evaluation on the effect of the temperature of the exhaust gas mass flow and thus on a possible temperature increase Hit component of the exhaust system.
  • Critical temperature increases can be avoided by ensuring adequate cooling at an early stage. This is particularly useful when there are several cooling options on an exhaust line, which can also be controlled separately. While straight sections that are arranged close to the engine give off more heat and accordingly require a higher flow rate or a larger mass flow of the cooling medium, the coolant flow can still be constant in other components.
  • the control 21 is integrated in a motor control 23. This is indicated in FIG. 3 as a broken block 23 in block 21.
  • FIG 4 shows a cross section through the device according to the invention (section IV-IV of Figure 3).
  • the outer jacket 2 surrounds the inner jacket 1 so that the first gap 3 is annular.
  • a catalyst carrier body 7 is located within the inner jacket 1.
  • An insulating gas for example air, is arranged in the second gap 6 between the inner jacket 1 and the catalyst carrier body 7.
  • a film 22 is also arranged in the second gap 6. This advantageously consists of a heat-resistant material, in particular of metal.
  • the surface of the film 22 facing the catalyst carrier body 7 is preferably configured such that incident radiation is diffusely scattered. A quasi double insulation layer is thus formed within the second gap 6.
  • the film 22 is corrugated. It is advantageous that the film 22, which touches the catalyst carrier body 7, only touches the inner jacket 1 at most with corrugation peaks or corrugation valleys. If there is a displacement of the catalyst carrier body 7 in the second gap 6, this offers the film 22 still has a sufficient insulation effect. It is preferred if the heat transfer coefficient of the second gap 6 is overall less than the heat coefficient on the wall of the inner shell 1 facing the outer shell 2 in the first gap 3. By suitable choice of the insulating medium or media and their arrangement in the second gap 6 Heat transfer mechanisms such as convection, heat conduction or heat radiation are kept as low as possible. This enables the device to be attached in the immediate vicinity of the internal combustion engine.
  • the device allows even the relatively high temperatures occurring there to be insulated to such an extent that, for example, no heat build-up occurs in an encapsulated engine compartment. It is also possible to bring components so close to a manifold or the internal combustion engine that the interior of the device, in particular a catalyst carrier body 7, then has a lower temperature than at least part of the outer jacket 2. Radiated heat cannot damage these components in this configuration.
  • FIG. 5 shows a further advantageous embodiment of a device according to the invention.
  • the inner jacket 1 and the outer jacket 2 form the first gap 3 for a cooling medium.
  • the catalyst carrier body 7 is arranged inside the inner jacket 1.
  • the foils 22 are structured in such a way that they practically do not form a flat surface, but are curved, corrugated or otherwise deformed. They can also have corresponding notches, knobs and similar or other structures. These are particularly expediently arranged as points of contact between the film 22 and the inner jacket 1 or the catalyst carrier body 7.
  • foils 22 can also overlap, whereby on the one hand they can serve as vibration dampers for the catalyst carrier body 7, and on the other hand they also function as insulation layers. It is advantageous if a film 22 is corrugated in such a way that it touches the inner jacket 1 or the catalyst carrier 7 at least predominantly only with corrugation peaks or valleys. The points of contact are thus small, which means that the heat flow that can be transmitted by heat conduction can be only slight at this point. Channels can also be formed in the second gap 6 with the film 22 or another suitable structured insulating material.
  • a cooling medium passed through the first gap 3 but also through the second gap 6.
  • 6 channels are formed in the second gap, whereby only a local coolant supply is achieved.
  • the cooling medium can either be the coolant used in the first gap 3 or it can be another cooling medium. If the same cooling medium is used, it is advantageous that the inner jacket 1 has openings through which the cooling medium can be guided to the second gap 6. Outlet openings can also be provided, so that a flow movement is also at least partially realized in the second gap 6.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

L'invention concerne un dispositif pour conduire un flux massique de gaz d'échappement, notamment en provenance d'un moteur à combustion interne, et/ou pour loger un corps support de catalyseur (7). Ce dernier comporte une chemise intérieure (1) et une chemise extérieure (2), la chemise intérieure étant entourée, au moins en partie, par la chemise extérieure. Entre la chemise intérieure et la chemise extérieure, un premier espace (3) est pourvu d'un orifice d'admission (4) et d'un orifice de sortie (5) de telle manière qu'un fluide de refroidissement (16) est guidé de l'orifice d'admission à l'orifice de sortie. Ce premier espace entoure, au moins en partie, un deuxième espace (6). La chemise intérieure est positionnée, au moins en partie, entre les premier et deuxième espaces.
PCT/EP1997/003524 1996-07-24 1997-07-03 Dispositif pour conduire un flux massique de gaz d'echappement et/ou pour loger un corps support de catalyseur WO1998004814A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU34430/97A AU3443097A (en) 1996-07-24 1997-07-03 Device for conducting a current of exhaust gas and/or for mounting a catalyst carrier body

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29612758U DE29612758U1 (de) 1996-07-24 1996-07-24 Vorrichtung zur Leitung eines Abgasmassenstromes und/oder Aufnahme eines Katalysatorträgerkörpers
DE29612758.2 1996-07-24

Publications (1)

Publication Number Publication Date
WO1998004814A1 true WO1998004814A1 (fr) 1998-02-05

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PCT/EP1997/003524 WO1998004814A1 (fr) 1996-07-24 1997-07-03 Dispositif pour conduire un flux massique de gaz d'echappement et/ou pour loger un corps support de catalyseur

Country Status (4)

Country Link
AU (1) AU3443097A (fr)
DE (1) DE29612758U1 (fr)
TW (1) TW368550B (fr)
WO (1) WO1998004814A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007075185A1 (fr) * 2005-12-27 2007-07-05 Caterpillar Inc. Systeme de moteur muni d'un echangeur de chaleur pour gaz d'echappement a mousse de carbone
US8069912B2 (en) 2007-09-28 2011-12-06 Caterpillar Inc. Heat exchanger with conduit surrounded by metal foam
US8272431B2 (en) 2005-12-27 2012-09-25 Caterpillar Inc. Heat exchanger using graphite foam
DE102010036303B4 (de) * 2010-07-08 2019-06-19 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verbrennungsmotor mit liegend angeordneten Zylinderbänken und Abgasturbolader

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10032023B4 (de) * 2000-07-01 2009-04-16 Volkswagen Ag Abgaskatalysator mit einer Wärmeisolierung
DE102015104591B4 (de) * 2015-03-26 2019-11-14 Volkswagen Aktiengesellschaft Abgaskanal einer Brennkraftmaschine, insbesondere mit Abgasturbolader, sowie Brennkraftmaschine mit einem solchen Abgaskanal

Citations (6)

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Publication number Priority date Publication date Assignee Title
US3820327A (en) * 1972-05-10 1974-06-28 Peugeot & Renault Temperature regulator for a catalytic reactor
DE2432285A1 (de) * 1974-07-05 1976-01-22 Eberspaecher J Abgaskatalysator
DE3938785A1 (de) * 1988-12-05 1990-06-07 Volkswagen Ag Kuehleinrichtung fuer einen katalytischen abgaskonverter
CH679460A5 (en) * 1990-10-10 1992-02-28 Daniel Greub Surface cooled exhaust gas catalyst useful for boat engines - having surface cooling by means of cooling jacket and used in engines having characteristic field and lambda controlled ignition
JPH05240030A (ja) * 1992-02-29 1993-09-17 Suzuki Motor Corp 触媒コンバータ
JPH07279653A (ja) * 1994-04-06 1995-10-27 Daihatsu Motor Co Ltd 内燃機関の排気浄化装置

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IT953824B (it) * 1971-05-07 1973-08-10 Renault Regolatore di temperatura per reattore catalitico
JPS5232019B2 (fr) * 1973-01-13 1977-08-18

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3820327A (en) * 1972-05-10 1974-06-28 Peugeot & Renault Temperature regulator for a catalytic reactor
DE2432285A1 (de) * 1974-07-05 1976-01-22 Eberspaecher J Abgaskatalysator
DE3938785A1 (de) * 1988-12-05 1990-06-07 Volkswagen Ag Kuehleinrichtung fuer einen katalytischen abgaskonverter
CH679460A5 (en) * 1990-10-10 1992-02-28 Daniel Greub Surface cooled exhaust gas catalyst useful for boat engines - having surface cooling by means of cooling jacket and used in engines having characteristic field and lambda controlled ignition
JPH05240030A (ja) * 1992-02-29 1993-09-17 Suzuki Motor Corp 触媒コンバータ
JPH07279653A (ja) * 1994-04-06 1995-10-27 Daihatsu Motor Co Ltd 内燃機関の排気浄化装置

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Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 701 (M - 1533) 21 December 1993 (1993-12-21) *
PATENT ABSTRACTS OF JAPAN vol. 096, no. 002 29 February 1996 (1996-02-29) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007075185A1 (fr) * 2005-12-27 2007-07-05 Caterpillar Inc. Systeme de moteur muni d'un echangeur de chaleur pour gaz d'echappement a mousse de carbone
US7287522B2 (en) 2005-12-27 2007-10-30 Caterpillar Inc. Engine system having carbon foam exhaust gas heat exchanger
US8272431B2 (en) 2005-12-27 2012-09-25 Caterpillar Inc. Heat exchanger using graphite foam
US8069912B2 (en) 2007-09-28 2011-12-06 Caterpillar Inc. Heat exchanger with conduit surrounded by metal foam
DE102010036303B4 (de) * 2010-07-08 2019-06-19 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verbrennungsmotor mit liegend angeordneten Zylinderbänken und Abgasturbolader

Also Published As

Publication number Publication date
AU3443097A (en) 1998-02-20
DE29612758U1 (de) 1996-10-02
TW368550B (en) 1999-09-01

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