WO2008062916A1 - Vehicle exhaust aftertreatment using catalytic coated electric heater - Google Patents

Vehicle exhaust aftertreatment using catalytic coated electric heater Download PDF

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Publication number
WO2008062916A1
WO2008062916A1 PCT/KR2006/004956 KR2006004956W WO2008062916A1 WO 2008062916 A1 WO2008062916 A1 WO 2008062916A1 KR 2006004956 W KR2006004956 W KR 2006004956W WO 2008062916 A1 WO2008062916 A1 WO 2008062916A1
Authority
WO
WIPO (PCT)
Prior art keywords
electric heater
exhaust gas
catalyst
metal carrier
purifying
Prior art date
Application number
PCT/KR2006/004956
Other languages
French (fr)
Inventor
Jae-Won Hwang
Won-Tae Kim
Do-Yon Yang
Original Assignee
Il Jin Electric Co., Ltd.
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 Il Jin Electric Co., Ltd. filed Critical Il Jin Electric Co., Ltd.
Priority to PCT/KR2006/004956 priority Critical patent/WO2008062916A1/en
Publication of WO2008062916A1 publication Critical patent/WO2008062916A1/en

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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
    • F01N3/24—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
    • F01N3/2803—Construction of catalytic reactors characterised by structure, by material or by manufacturing of catalyst support
    • F01N3/2807—Metal other than sintered metal
    • 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 ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F01N13/0097—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series the purifying devices are arranged in a single housing
    • 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 ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • 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
    • F01N2240/16—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 an electric heater, i.e. a resistance heater
    • 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/02—Metallic plates or honeycombs, e.g. superposed or rolled-up corrugated or otherwise deformed sheet metal
    • 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
    • F01N2330/00—Structure of catalyst support or particle filter
    • F01N2330/30—Honeycomb supports characterised by their structural details
    • F01N2330/44—Honeycomb supports characterised by their structural details made of stacks of sheets, plates or foils that are folded in S-form
    • 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
    • F01N2510/00—Surface coverings
    • F01N2510/06—Surface coverings for exhaust purification, e.g. catalytic reaction
    • 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 present invention relates to a device for purifying an exhaust gas for vehicles using a catalyst-coated divided electric heater using a strip, more particularly, to a device for purifying an exhaust gas for vehicles using a catalyst-coated divided electric heater using a strip which is capable of purifying an exhaust gas with the minimum energy for activating a catalyst by directly coating on the divided electric heater in supplying an external heat source to an electric heater when driving vehicles at a low temperature or for a cold startupin order to remove harmful materials of an exhaust gas.
  • an internal combustion engine generating a motive power of a vehicle emits a great amount of harmful corpuscles when igniting fuels.
  • the sprayed fuels cause a self-ignition by the rise of a temperature due to a compression of a piston to emit a great amount of harmful corpuscles (referred to "soot", hereinafter) such as particulate matter, nitrogen oxide, smokeless hydrocarbon, carbon monoxide and smelling materials owing to the incomplete combustion in the process for combusting the fuels.
  • the vehicles using diesel fuels are applied by an exhuast pipe for emitting an exhaust gas for preventing an air pollution or a pretreatment device for less emitting the air polluting materials from the engine itself at other portions before the exhaust gas is emitted to the outside.
  • an aftertreatment device cannot be avoided for the purpose of purifying the exhaust gas.
  • the harmful gas emitted from the vehicles are particulate matter (PM), a carbon monoxide (CO) and a unburnt hydrocarbon (HC), etc.
  • PM are collected by a filter using a ceramic filter and oxided as an exhaust gas heat or an external heat source periodically and HC/CO being a gaseous material is oxided by the exhaust gas temperature by coating a filter or a carrier by a catalyst in general.
  • An object of the present invention designed to solve the above problems is to provide with a device for purifying an exhaust gas for vehicles using a catalyst-coated divided electric heater using a strip capable of purifying an exhaust gas with the minimum gas in order to activate a catalyst by directly coating on the electric heater when an exteral heat source is supplied to vehicles driven at a low temperature or for a cold startup in order to remove harmful materials of an emission gas.
  • Another object of the presetn invention is to provide with a device for purifying an exhaust gas for vehicles which is capable of reducing an exhaust gas by activating a catalyst with a little energy at even a temperature which a catalyst is not activated by an exhaust gas heat emitted from an engine and oxiding a soot collected in a filter with a little energy positioned at the front end of the device for purifying an exhaust gas.
  • the present invention provides with a device for purifying an exhaust gas for vehicles comprising an electric heater and a metal carrier, the device being characterized in that the surface of the electric heater is coated with a catalyst which can reduce the time for activating the catalyst due to an electric heat generation and the heating temperature for the electric heater.
  • the electric heater and the metal carrier are mechanically connected by a junction means but are electrically divided.
  • the electic heater is formed by bending a manifold having stacked thin waveform strips formed to have a regular amplitude and a regular period.
  • the electric heater and the metal carrier are made of a Fe-Cr-Al alloy in order to prevent a damage due to a heat and an exhaust gas.
  • the electric heater is separated into at least one segments.
  • the electric heater is coupled with at least two metal carriers in serial or in parallel at the front end of the metal carrier.
  • the electric heater and the metal carrier form one group, more than one groups are provided.
  • FIG. 1 is a structural view of an electric heater
  • FIGs. 2A and 2B are a front view of a metal carrier and a conceptual view of the stacked state
  • FIG. 3 is a structural view of a device for purifying an exhaust gas for vehicles according to the embodiment 1 of the present invention.
  • FIG. 4 is a structural view of a device for purifying an exhaust gas for vehicles according to the embodiment 2 of the present invention.
  • FIG. 5 is a structural view of a device for purifying an exhaust gas for vehicles according to the embodiment 3 of the present invention. Best Mode for Carrying Out the Invention
  • the major feature of the present invention is that it has a structure in which a catalyst itself is directly heated by an electric energy to lose a little bit of heat due to an emission heat and a catalyst is expected to be activated by heating the front end of the heater because there is a catalyst-coated metal carrier at the rear end of the heater, therefore it has a structure capable of keeping a radiation from being prevented, contrary to the structure which warms an exhaust gas for activating a catalyst.
  • the electric heater and the metal carrier be made of a
  • Fe-Cr-Al alloy in order to prevent it from being damaged by a continuous heat and an exposure to an exhaust gas.
  • the electric heater (200) adopted in the present invention is a stack of thin strips
  • the catalyst adopted in the electric heater (200) itself is heated by electric heating and can be activated.
  • the electric heater (200), as shown in FIG. 2, has a structure comprising several flat strips and several wave strips or a structure where several wave strips are adhered by an adhesive agent and the manifold consisting of the stacked wave panels are bent and can have a desired resistance value.
  • the thinly stacked strip (201) is manufactured to have many cells in order to increase an amount to contact with the air.
  • the electric heater (200) is divided into at least one segment to consist of a segment in the center and at least two external segments surrounding the centeral segment in the embodiment as shown in FIG. 2.
  • the electric heater (200) is divided into a plurality of segments to efficiently supply a power in accordance with an amount of soot collected in the segment or an emission of gaseous materials, and therefore it is possible to reduce energy consumed when the heater for reproducing PM unnecessarily.
  • the entire diameter of the electric heater (200) be greater than a metal carrier in order to complement a heat loss of the metal carrier.
  • FIGs. 2A and 2B show a metal carrier (100) used in the present invention, the metal carrier (100) being formed by stacking the wave panel (101) and the flat panel (102) alternately.
  • the flat panel (102) may have a different length from the wave panel
  • FIG. 3 is a conceptual view of the embodiment 1 adopting the electric heater of the present invention, where the catalyst-coated electric heater (31) is positioned at the front end of the pipe (30) and the catalyst-coated metal carrier (32) is positioned at the rear end of the pipe (30).
  • the catalyst adopted in the electric heater (31) is activated by the heat itself and the metal carrier (32) positioned at the rear end activates a catalyst using a heat by a heating response of the electric heater (31) at the front end.
  • the junction means has an electrically cutting insulating material at both ends with an insulator like ceramics in the center, the insulating materials being coupled with the electric heater and the metal carrier by a welding, etc. [46] Therefore, the electric heater and the metal carrier are mechanically connected but electrically insulated. [47] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various mod- ifictions, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
  • the present invention can be used in a device for purifying an exhaust gas for vehicles capable of reducing an exhaust gas by activating a catalyst with less energy even at a temperature that a catalyst is not activated by an exhaust gas emitted from an engine.

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  • 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)
  • Catalysts (AREA)

Abstract

The present invention relates to a device for purifying an exhaust gas for vehicle using a catalyst-coated divided electric heater using a strip which is capable of purifying an exhaust gas with the minimum energy for activating a catalyst by directly coating on a divided electric heater in supplying an external heat source to an electric heater when driving vehicles at a low temperature or for a cold startupin order to remove harmful materials in an exhaust gas.

Description

Description
VEHICLE EXHAUST AFTERTREATMENT USING CATALYTIC COATED ELECTRIC HEATER
Technical Field
[1] The present invention relates to a device for purifying an exhaust gas for vehicles using a catalyst-coated divided electric heater using a strip, more particularly, to a device for purifying an exhaust gas for vehicles using a catalyst-coated divided electric heater using a strip which is capable of purifying an exhaust gas with the minimum energy for activating a catalyst by directly coating on the divided electric heater in supplying an external heat source to an electric heater when driving vehicles at a low temperature or for a cold startupin order to remove harmful materials of an exhaust gas. Background Art
[2] In general, an internal combustion engine generating a motive power of a vehicle emits a great amount of harmful corpuscles when igniting fuels. Especially, in the internal combustion engines of a diesel engine, the sprayed fuels cause a self-ignition by the rise of a temperature due to a compression of a piston to emit a great amount of harmful corpuscles (referred to "soot", hereinafter) such as particulate matter, nitrogen oxide, smokeless hydrocarbon, carbon monoxide and smelling materials owing to the incomplete combustion in the process for combusting the fuels.
[3] The fuels which were not completely burnt in the process for combustion of the diesel engine become soot and are emitted to the air along with an exhaust gas of vehicles. The soot is extended into the air to be penetrated to the lung finally, causing a tremendous result like even causing a cancer not to mention a bronchitis.
[4] Recently, the seriousness of the air pollution arises an urgent problem to be solved throughout the society and the regulations of the exhaust gas of vehicles get strict more and more as this problem brings the measurements of regulations for the environment of the worldwide.
[5] For the above reasons, the vehicles using diesel fuels are applied by an exhuast pipe for emitting an exhaust gas for preventing an air pollution or a pretreatment device for less emitting the air polluting materials from the engine itself at other portions before the exhaust gas is emitted to the outside. However, as the regulations of the exhaust gas are strengthened, an aftertreatment device cannot be avoided for the purpose of purifying the exhaust gas.
[6] The harmful gas emitted from the vehicles are particulate matter (PM), a carbon monoxide (CO) and a unburnt hydrocarbon (HC), etc. [7] In the existing method of purifying an exhaust gas, PM are collected by a filter using a ceramic filter and oxided as an exhaust gas heat or an external heat source periodically and HC/CO being a gaseous material is oxided by the exhaust gas temperature by coating a filter or a carrier by a catalyst in general.
[8] At this time, when a car is driven at a low temperature for a long time, it can not reach the temperature for activating a catalyst and a harmful gas is emitted to the air at the state of not being purified.
[9] There is a device for alleviating the exhuast gas to the temperature for activating a catalyst using an external heat source like an electric heater because of the decrease of emission capability when a car is driven at a low temperature for a long time or for a cold startup but it is disadvantageous in requiring for a lot of energy temporarily. Disclosure of Invention Technical Problem
[10] An object of the present invention designed to solve the above problems is to provide with a device for purifying an exhaust gas for vehicles using a catalyst-coated divided electric heater using a strip capable of purifying an exhaust gas with the minimum gas in order to activate a catalyst by directly coating on the electric heater when an exteral heat source is supplied to vehicles driven at a low temperature or for a cold startup in order to remove harmful materials of an emission gas.
[11] Another object of the presetn invention is to provide with a device for purifying an exhaust gas for vehicles which is capable of reducing an exhaust gas by activating a catalyst with a little energy at even a temperature which a catalyst is not activated by an exhaust gas heat emitted from an engine and oxiding a soot collected in a filter with a little energy positioned at the front end of the device for purifying an exhaust gas. Technical Solution
[12] In order to attain the above objects, the present invention provides with a device for purifying an exhaust gas for vehicles comprising an electric heater and a metal carrier, the device being characterized in that the surface of the electric heater is coated with a catalyst which can reduce the time for activating the catalyst due to an electric heat generation and the heating temperature for the electric heater.
[13] The electric heater and the metal carrier are mechanically connected by a junction means but are electrically divided.
[14] In addition, the electic heater is formed by bending a manifold having stacked thin waveform strips formed to have a regular amplitude and a regular period.
[15] Moreover, the electric heater and the metal carrier are made of a Fe-Cr-Al alloy in order to prevent a damage due to a heat and an exhaust gas.
[16] Furthermore, the electric heater is separated into at least one segments. [17] In addition, the electric heater is coupled with at least two metal carriers in serial or in parallel at the front end of the metal carrier. [18] Furthermore, the electric heater and the metal carrier form one group, more than one groups are provided.
Advantageous Effects
[19] According to the present invention, it is possible to activate a catalyst for purifying an exhaust gas with a little energy by directly applying a catalsyt to an electric heater.
[20] In addition, it is possible to locally heat the electric heater formed in a division structure.
[21] Moreover, as a catalyst is coated on a radiation heat prevention layer of a metal carrier, it is possible to use a heat by a radiation heat and a heat by a convection at the same time, and further to activate the catalyst safely in the region of a low temperature for a long time. Brief Description of the Drawings
[22] FIG. 1 is a structural view of an electric heater;
[23] FIGs. 2A and 2B are a front view of a metal carrier and a conceptual view of the stacked state;
[24] FIG. 3 is a structural view of a device for purifying an exhaust gas for vehicles according to the embodiment 1 of the present invention;
[25] FIG. 4 is a structural view of a device for purifying an exhaust gas for vehicles according to the embodiment 2 of the present invention; and
[26] FIG. 5 is a structural view of a device for purifying an exhaust gas for vehicles according to the embodiment 3 of the present invention. Best Mode for Carrying Out the Invention
[27] Hereinafter, the present invention now will be described in detail in the embodiments and the drawings.
[28] The major feature of the present invention is that it has a structure in which a catalyst itself is directly heated by an electric energy to lose a little bit of heat due to an emission heat and a catalyst is expected to be activated by heating the front end of the heater because there is a catalyst-coated metal carrier at the rear end of the heater, therefore it has a structure capable of keeping a radiation from being prevented, contrary to the structure which warms an exhaust gas for activating a catalyst.
[29] In addition, it is preferable that the electric heater and the metal carrier be made of a
Fe-Cr-Al alloy in order to prevent it from being damaged by a continuous heat and an exposure to an exhaust gas.
[30] The electric heater (200) adopted in the present invention is a stack of thin strips
(201) coated with a catalyst. [31] Therefore, the catalyst adopted in the electric heater (200) itself is heated by electric heating and can be activated.
[32] The electric heater (200), as shown in FIG. 2, has a structure comprising several flat strips and several wave strips or a structure where several wave strips are adhered by an adhesive agent and the manifold consisting of the stacked wave panels are bent and can have a desired resistance value.
[33] The thinly stacked strip (201) is manufactured to have many cells in order to increase an amount to contact with the air.
[34] In addition, the electric heater (200) is divided into at least one segment to consist of a segment in the center and at least two external segments surrounding the centeral segment in the embodiment as shown in FIG. 2.
[35] Accordingly, the electric heater (200) is divided into a plurality of segments to efficiently supply a power in accordance with an amount of soot collected in the segment or an emission of gaseous materials, and therefore it is possible to reduce energy consumed when the heater for reproducing PM unnecessarily.
[36] In addition, it is preferable that the entire diameter of the electric heater (200) be greater than a metal carrier in order to complement a heat loss of the metal carrier.
[37] FIGs. 2A and 2B show a metal carrier (100) used in the present invention, the metal carrier (100) being formed by stacking the wave panel (101) and the flat panel (102) alternately.
[38] Furthermore, the flat panel (102) may have a different length from the wave panel
(101) in order to increase the amount of PM collected in the metal carrier (100).
[39] FIG. 3 is a conceptual view of the embodiment 1 adopting the electric heater of the present invention, where the catalyst-coated electric heater (31) is positioned at the front end of the pipe (30) and the catalyst-coated metal carrier (32) is positioned at the rear end of the pipe (30).
[40] The electric heater (31) and the metal carrier (32) are mechanically combined.
When the electric heater (31) at the front end is operated, the catalyst adopted in the electric heater (31) is activated by the heat itself and the metal carrier (32) positioned at the rear end activates a catalyst using a heat by a heating response of the electric heater (31) at the front end.
[41] However, in case that the temperature of an exhaust gas is too low to arise an excessive temperature difference between a heat unit and a metal carrier, the surface of a heater unit is excessively risen in order to increase the temperature of a metal carrier, resulting in degrading a catalyst.
[42] Accordingly, like the embodiment 2 as shown in FIG. 4, two electric heaters (41,
42) at the front end of the pipe (40) are coupled in serial to increase the temperature of the metal carrier (43), maintaining the temperature in the heater unit not to rise ex- cessively. [43] Like the embodiment 3 as shown in FIG. 5, in case that the electric heater (51, 53) and the metal carrier (52, 54) are coupled in serial, it is beneficial to use it for the purpose of a low voltage and a high current because it is possible to raise the temperature of treating an exhaust gas by multistages. [44] The electric heater and the metal carrier are coupled each other by a junction means
(not shown). [45] The junction means has an electrically cutting insulating material at both ends with an insulator like ceramics in the center, the insulating materials being coupled with the electric heater and the metal carrier by a welding, etc. [46] Therefore, the electric heater and the metal carrier are mechanically connected but electrically insulated. [47] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various mod- ifictions, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
Industrial Applicability [48] The present invention can be used in a device for purifying an exhaust gas for vehicles capable of reducing an exhaust gas by activating a catalyst with less energy even at a temperature that a catalyst is not activated by an exhaust gas emitted from an engine.

Claims

Claims
[1] A device for purifying an exhaust gas for vehicles comprising an electric heater and a metal carrier, the device being characterized in that the surface of the electric heater is coated with a catalyst which can reduce the time for activating the catalyst due to an electric heat generation and the heating temperature for the electric heater.
[2] The device of claim 1 , wherein the electric heater and the metal carrier are mechanically connected by a junction means but are electrically divided.
[3] The device of claim 1, wherein the electic heater is formed by bending a manifold having stacked thin waveform strips formed to have a regular amplitude and a regular period.
[4] The device of claim 1 , wherein the electric heater and the metal carrier are made of a Fe-Cr-Al alloy in order to prevent a damage due to a heat and an exhaust gas.
[5] The device of claim 1, wherein the electric heater is separated into at least one segments.
[6] The device of claim 1 , wherein the electric heater is coupled with at least two metal carriers in serial or in parallel at the front end of the metal carrier.
[7] The device of claim 1, wherein the electric heater and the metal carrier form one group, more than one groups are provided.
PCT/KR2006/004956 2006-11-23 2006-11-23 Vehicle exhaust aftertreatment using catalytic coated electric heater WO2008062916A1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2947288A1 (en) * 2014-05-23 2015-11-25 Toyota Jidosha Kabushiki Kaisha Electric heating device and exhaust purification system for an internal combustion engine
DE102011116981B4 (en) 2010-10-29 2021-09-16 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Exhaust gas treatment system for treating exhaust gas from an internal combustion engine
EP3972725A4 (en) * 2019-05-21 2023-04-05 Vestlandets Innovasjonsselskap AS A modularized catalytic converter and a method of enhancing the efficiency of a catalytic converter
US20230332528A1 (en) * 2020-06-30 2023-10-19 Vitesco Technologies GmbH Exhaust gas aftertreatment device

Citations (6)

* Cited by examiner, † Cited by third party
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DE102011116981B4 (en) 2010-10-29 2021-09-16 GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) Exhaust gas treatment system for treating exhaust gas from an internal combustion engine
EP2947288A1 (en) * 2014-05-23 2015-11-25 Toyota Jidosha Kabushiki Kaisha Electric heating device and exhaust purification system for an internal combustion engine
EP3972725A4 (en) * 2019-05-21 2023-04-05 Vestlandets Innovasjonsselskap AS A modularized catalytic converter and a method of enhancing the efficiency of a catalytic converter
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