CN1311844A - Method and device for post-treamtent of exhaust gases of an internal combustion engine - Google Patents

Method and device for post-treamtent of exhaust gases of an internal combustion engine Download PDF

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Publication number
CN1311844A
CN1311844A CN99809069A CN99809069A CN1311844A CN 1311844 A CN1311844 A CN 1311844A CN 99809069 A CN99809069 A CN 99809069A CN 99809069 A CN99809069 A CN 99809069A CN 1311844 A CN1311844 A CN 1311844A
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China
Prior art keywords
scope
described equipment
flow
equipment
face
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Pending
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CN99809069A
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Chinese (zh)
Inventor
A·克尼格
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Volkswagen AG
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Volkswagen AG
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Publication date
Priority claimed from DE19850762A external-priority patent/DE19850762A1/en
Application filed by Volkswagen AG filed Critical Volkswagen AG
Publication of CN1311844A publication Critical patent/CN1311844A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
    • B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
    • B01D53/9445—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC]
    • B01D53/9454—Simultaneously removing carbon monoxide, hydrocarbons or nitrogen oxides making use of three-way catalysts [TWC] or four-way-catalysts [FWC] characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/88—Handling or mounting catalysts
    • B01D53/885—Devices in general for catalytic purification of waste 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
    • F01N3/021—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 filters
    • F01N3/0214—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 filters with filters comprising movable parts, e.g. rotating filters
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0828—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents characterised by the absorbed or adsorbed substances
    • F01N3/0842—Nitrogen oxides
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • 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
    • F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
    • F01N3/0871—Regulation of absorbents or adsorbents, e.g. purging
    • F01N3/0885—Regeneration of deteriorated absorbents or adsorbents, e.g. desulfurization of NOx traps
    • 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
    • F01N2290/00—Movable parts or members in exhaust systems for other than for control purposes
    • F01N2290/02—Movable parts or members in exhaust systems for other than for control purposes with continuous rotary movement
    • F01N2290/06—Movable parts or members in exhaust systems for other than for control purposes with continuous rotary movement driven by auxiliary drive
    • 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
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/04—Sulfur or sulfur oxides
    • 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
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/03—Adding substances to exhaust gases the substance being hydrocarbons, e.g. engine fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/12—Other methods of operation
    • F02B2075/125—Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

The invention relates to a method and device for post-treating the exhaust gases of an internal combustion engine. The inventive device comprises a body (4) through which exhaust gases flow and which is rotatably placed in the flow of said exhaust gases, as well as a filter (6) which can rotate with said body (4). The rotation speed of the body (4) is selected so that a major part of the temperature front which forms in the body remains in said body. Preferably, said body is in the form of a cylinder with an axial cavity (7) which houses the filter (6) and through which channels (3) extend in the radial direction (3). The rotation axis of said cylinder is perpendicular to the direction of flow of the exhaust gases. When the body is in the form of a NOx accumulating catalyst, removal of nitric oxide can be achieved by cyclic enrichment of the exhaust gases or by introduction of extra fuel in the inventive device. Thus, desulfurization of the catalyst is triggered by a corresponding command of rotation of said catalyst.

Description

The equipment and the method that are used for the engine exhaust reprocessing of internal-combustion engine
The present invention relates to a kind of equipment and method that is used for the engine exhaust reprocessing of internal-combustion engine, and particularly relate to a kind of equipment and method that is used for the charcoal cigarette particulate and/or the nitrogen oxide of reprocessing exhaust flow.
Disclosed nitrogen oxide (NO x) catalyst adsorbs is at the nitrogen oxide that produces between the weak mixture on-stream period of motor and the nitrogen oxide reduction of storing during making rich running at motor, wherein, disclosed method is discontinuous and the storage of nitrogen oxide is carried out in different time phases with reduction.For carrying out this method, storage must be drained after the regular hour based on limited absorptivity.Emptying or carry out in the past in a period of time of predesignating, or must determine the degree of filling of catalyst converter.If storage was reproduced in the past in time of predesignating, then its shortcoming is, for security reasons, the storage capacity of catalyst converter is not utilized fully, the result cause motor operate at oil consumption and the exhaust gas properties aspect is not best.If storage is reproduced under the situation of the certain degree of filling of reaching of storage, then its shortcoming is, need one additional, determine the device of the degree of filling of nitrogen oxides storage catalyst converter.Wherein, determine that accurately the degree of filling of storage is difficult, in view of the above,, under the situation that storage is not full of as yet fully, also have to switch to the regeneration action having under the prerequisite of this additional device.This finally causes the unfavorable running of motor equally.In addition,, also have following situation, promptly under the situation of the rich running of motor, do not reach best exhaust gas properties and, must carry out the control of complexity motor for making the engine cycles running for two kinds of methods.
In addition, work well enough in order to make the nitrogen oxides storage catalyst converter, must be at least about 250 ℃ temperature.If the waste gas from motor is too cold, then this method can only just work under catalyst converter is heated to the condition of this minimum temperature.Heat loss so just occurs, in view of the above, increased energy consumption greatly.
In addition, charcoal cigarette particulate in the environment appears being released in the waste gas of diesel engine.For the waste gas that this is had charcoal cigarette particulate carries out reprocessing, the charcoal cigarette is trapped in a kind of disclosed equipment, and or along with certain degree of filling that reaches of charcoal cigarette filter, charcoal cigarette filter is replaced circularly, or the charcoal cigarette particulate of lighting and burning and be detained with a corresponding heating equipment.For continuous use, these two kinds of ways all are not satisfied.
Therefore, the task of invention is to develop a kind of optimum operation exhaust flow, that make motor that is used to handle internal-combustion engine becomes possible equipment and method.
The technological scheme that solves above task is claim 1,24 and 27 feature.The preferred form of implementation of invention is the theme of dependent claims.
Equipment of the present invention, that be used for the I. C. engine exhaust after-treatment have one have on it the groove crossed by exhaust flow, be located at the object or the monomer of exhaust flow pivotally.Monomer referred to herein as an object, this object can by pottery, by the carrier material of metal integrally constitute or by pottery or metal, be located at a fan-shaped section in the contained structure and constitute.
In addition, equipment of the present invention has a flow channel, and this flow channel flows with a part (B1) of the groove of object and is communicated with.In addition, also regulation has the connection of flowing, and this connection of flowing is communicated with the part B1 outlet side ground by the flow channel process of groove and this part B1 fluidly is communicated with a part of B2 of groove, and this part B2 is not communicated with flow channel.
Object or monomer preferably are divided into two scope B1, B2, wherein, waste gas enters the first scope B1 at the front-end face place of object, flow out at ear end face place at the first scope B1, flow through and be located at the filter at this place, flow into end face of the second scope B2 and in the other end 2 places leave the second scope B2, wherein, object 4 in the process of flowing through around an axle revolution that is substantially perpendicular to the flow direction of exhaust flow.
Object preferably has columniform shape, and wherein, groove radially stretches.Object has a columniform space vertically, and in other words, cylindrical body is hollow vertically.Wherein, object can be made of metal or pottery, and wherein, object both can be overall structure, or can be can be by the structure of fan-shaped section combination.If object is made of fan-shaped section, then these fan-shaped section are extended through by groove, and groove is radially stretched in cylindrical symmetry axis after the fan-shaped section combination.
Equipment of the present invention preferably includes a filter, and this filter can be provided with pivotally, and wherein, filter can particularly turn round with monomer.Wherein, under the situation of columniform, as to have axial cavity object, filter is located in this axial cavity.Wherein, filter can be fix or can turn round with object, wherein, rotating speed not necessarily is equal to the rotating speed of object.
In addition, internal-combustion engine has one and direct fuel injection gone into the fuel injection system of firing chamber and/or is a diesel engine.
Filter preferably has a heating element, and this heating element is used for after cold starting filter being heated to operating temperature.After reaching required temperature, heating element can be disconnected.In principle, under not causing the condition of charcoal cigarette burning, the condition (exhaust gas temperature) of motor just do not have an additional heating equipment.The required temperature that is used for the harmful matter conversion particularly also alternately or auxiliarylyly is reached by parameter (emitted dose, course of injection, postinjection) that select, motor worthily apace, thus, under the situation that required temperature is reached, the parameter of motor also returns to its normal conditions.
In addition, for harmful matter is reduced, particularly to NO xHC and/or CO reduce, and object can scribble catalyst layer at least in part.
In addition, equipment has a fixing shell (12), is located in this shell around the rotating object of the longitudinal axis of oneself.This shell preferably is made of nonmetallic material.
The revolution of object is preferably undertaken by a driver element, and this driver element can constitute by a motor.Driver element also can constitute by an external magnetic field and the magnet that is located in the shell.In addition, the form that object also can a turbine is rotated by exhaust flow.The rotating speed of object (4) is preferably about 0.3 to 10 rev/min, and wherein, the choice criterial of rotating speed is that the maximum value of the temperature distribution of foundation is stayed interior of articles, preferably stays the residing place of filter.
In addition, in order to impel the reduction of nitrous oxides exhaust gas composition under the situation of starting the running of function weak mixture, equipment can have a mechanism that is used to inject additional fuel.This mechanism that is used for injecting additional fuel is the turning axle that preferably is located at object.
The method of exhaust after-treatment of the present invention, as to be used for internal-combustion engine, wherein, it is that groove runs through and the object that is divided into two scopes is provided in a side of in the exhaust flow along exhaust gas flow direction, has following steps:
Exhaust flow is imported the front-end face of first scope,
On the ear end face of first scope exhaust flow imported an end face of second scope and on the other end of second scope, discharging exhaust flow, and
In the process of running, allow object turn round, make groove change second scope over to from first scope around an axis.
In addition, object, makes by the heating of exhaust flow to second scope to cause by the heating of first scope to exhaust flow around its axis rotation with such speed.
The charcoal cigarette particulate of exhaust flow preferably be trapped on the filter between the end face of waste gas inflow side of the end face of a waste gas outflow side of being located at first scope and second scope and rotating speed so selected, the maximum value of temperature front is positioned on this filter haply.
Used in the method object preferably scribbles catalyst layer at least in part, makes the NO in the storage waste gas between the weak mixture on-stream period of internal-combustion engine xBy additional reducing agent in object, continuous NO x-memory refresh method also can work.
Be used to make the method for the present invention of the equipment desulfurization of exhaust after-treatment of the present invention, as to be used for internal-combustion engine, wherein, equipment has following steps as the design of nitrogen oxides storage device:
When desulfurization begins, when the amount of the harmful substance in the waste gas increases, slow down or ends the rotation of object, enter or by second scope until the temperature maximum value that occurs, particularly enter or pass through near the end face of waste gas outflow side of second scope,
Object is rotated, occupies the position of first scope at least most ofly, the temperature maximum value mainly is in first scope, rotation is ended until second scope, until minimum second scope that arrives of temperature maximum value,
Reduce postinjection and object is rotated again.
Wherein, following way can be necessary, promptly allows rotation slow down or end and is repeatedly repeated, and has all taken off sulphur until all basically scopes.Roughly be in the temperature maximum value under the situation on the intersection point of two scopes, the continuous rotation of object is rebulid.
Describe preferred form of implementation of the present invention in detail by accompanying drawing below.Accompanying drawing is depicted as:
Fig. 1 a is used for the viewgraph of cross-section of level of first form of implementation of present device of the exhaust after-treatment of internal-combustion engine,
The vertical cross-sectional view of Fig. 1 b Fig. 1 a apparatus shown,
Fig. 2 is used for the viewgraph of cross-section of level of second form of implementation of present device of the exhaust after-treatment of internal-combustion engine.
Fig. 1 a shows the level cross-sectionn figure of first preferred form of implementation of the present device of the exhaust after-treatment that is used for internal-combustion engine.The former waste gas of motor (not shown) flows into the exterior edge face 2 of the first scope B1 of columniform, the object 4 that is penetrated with groove 3 by an exhaust steam passage 1.Wherein, groove 3 radially stretches with respect to the turning axle 9 that forms by cylindrical symmetry axis.As previously mentioned, the groove 3 that is provided with perpendicular to turning axle 9 is to scribble catalyst layer at least in part.Behind the passing through interior edge face 5 that axial cavity 7 that the central authorities object constitute is formed and flow out of object 4, waste gas is located at the particulate filter 6 in the cavity 7 by one and enters the second scope B2 on opposite and enter a flow pass 8 at 2 places, exterior edge face of the second scope B2 by exterior edge face 5 at waste gas.Be that first scope and second scope are limited to three grooves 3 respectively by flow channel 1 and flow pass 8 shown in Fig. 1 a.This is not that be far from it can not.The another kind of structure of the shell 10 by surrounding object 4 can reach following result, promptly flows into and the waste gas that flows out reaches respectively and is 180 ° the first and second scope B1, B2 to the maximum.In other words, first and second scopes can maximum comprise half of object 4.
Fig. 1 b shows the vertical sectional view of equipment of the present invention.Within the object 4 that is penetrated with groove 3, be provided with common and object 4 synchronous rotating filters 6.Object 4 and filter 6 are located in the corresponding shell 10.Revolution is carried out around a turning axle 9, and this turning axle 9 can be used for importing additional fuel with in the filter of a catalytic activity or at the rotor matrix, i.e. burning in the object 4.
The object 4 that has filter 6 by flowing through, on input side, temperature is by raising to some extent to the CO that exists in waste gas and the catalytic conversion of HC during the groove 3 of exhaust flow through scribbling catalyst layer.Simultaneously, nitrogen oxide scribbles absorption of N O at groove 3 xThe situation of catalyst layer under can chemically be absorbed.
The temperature maximum value is reached in particulate filter 6 at the center of equipment.When continuing to flow through object 4 or rotor, waste gas emit once more its heat and with approximately with input side on identical temperature leave rotor 4.Under non-rotary situation, temperature front, promptly maximum temperature can be discharged from from equipment.By the rotation of rotor 4, temperature front again and again by refoulement in system.The distribution that the average generation one-period is fixing, its maximum value is in the scope of filter 6.
Fig. 2 shows the viewgraph of cross-section of level of second form of implementation of the present device of the exhaust after-treatment that is used for internal-combustion engine, and in this second form of implementation, equipment is as pure NO xThe running of-accumulator-type catalytic converter.
Fig. 2 shows an object 4 around its longitudinal axis rotation, and this object 4 is as NO x-accumulator-type catalytic converter is cated, this NO x-accumulator-type catalytic converter is used as heat exchanger.Object 4 radially has many thin grooves 3 and radially by the exhaust flow mistake, specifically, waste gas flows into object 4 via a flow channel 1 and is derived via a flow pass 8, and in view of the above, the first and second scope B1, B2 are formed with the situation of first form of implementation the samely.In addition, object has an axial cavity 7, and this cavity 7 is limited by the interior edge face 5 of object 4.This axial cavity is used for the connection of flowing of groove 3 to the first and second scope B1, B2.Flow divert does not preferably take place, and in view of the above, has reduced pressure loss.Groove 3 be expressed as part annulus T1, inner, scribble storage NO xCatalyst layer.Part annulus T2, outer that is expressed as of groove 3 is not coated with catalyst layer and does not participate in catalysis.This outer part has only the function of heat exchanger.By in rotation, radially being flow through by waste gas, in object 4, can set up a temperature distribution, in the inflow of the exterior edge face 2 of object or the temperature that the temperature on the outflow side is substantially equal to waste gas, to the centre, the side temperature skyrockets about 350 to 400 ℃.In view of the above, the part of catalyst converter always be in a best, be used to store NO xTemperature range in.Catalyst converter, promptly the rotary setting of object 4 is responsible for reclaiming heat to the maximum limit by the principle of recover.Under the correct situation of thermal resistance ideal, specifications design and rotating speed, the heat that once entered is no longer left system.The actual heat loss that occurs is compensated by the reaction heat that discharges in scope T1 when the harmful matter oxidation.
In order to make the cooling system starting, about 200 ℃ initiation temperature must be reached in the scope T2 of catalytic activity.For this reason, can have the heating element 11 of an electricity at the center of object 4.As an alternative and/or auxiliary, also can be reached for the required temperature of harmful matter conversion by parameter that select, motor (particularly under the situation that adopts gas-accumulating tank air inlet oil spout such as) compatibly by variation injection time point, course of injection, emitted dose and/or postinjection.After reaching initiation temperature, the measure termination of being taked.Continuing to improve temperature only needs to be undertaken by improve the harmful substance concentration that catalyst temperature is increased by the reaction heat that discharges in short time in scope T1 when changing harmful matter.The raising of harmful substance concentration can or by inject individually at the center of object 4 fuel or equally the parameter by motor be reached.
The rotation of object 4 realizes by a suitable drive unit (not shown) electric or machinery.For this reason, but object 4 be installed in a pivoting support the axle or turning axle 9 on, this axle is rotated by above-mentioned drive unit.By this axle 9, the fuel that also can add injects.Under the situation of using a motor, rotating speed can be by suitable from the operating mode of information engine controlling unit, that be fit to and motor car engine.In addition, object 4 is provided in a side of in suitable, the fixing shell 10.
NO xThe regeneration of-accumulator-type catalytic converter is undertaken by the motor enriching to waste gas in the known manner.
Under situation with the fuel of sulfur-bearing, must be at regular intervals, as described in front, catalyst converter is carried out desulfurization.This can carry out with hot mode when the temperature that is higher than 600 ℃.As previously mentioned, in described system, concentration that can be by increasing harmful matter or the oxidation by harmful matter almost at random improve temperature.By suitable control rotating speed and concentration of narmful substance, catalyst converter can be held required high temperature in the time of desired some minutes.As previously mentioned, compare the energy consumption much less with traditional system.
Therefore, be possible by the following form of implementation of two described equipment of embodiment above:
Have one can be in exhaust flow rotating object 4, do not have catalyst coat and be not used in the equipment of in equipment, setting up the peaked filter of temperature;
Have one can be in exhaust flow rotating object 4 and one be located at equipment in the object 4, that be used for filter 6 that charcoal cigarette particulate is burnt;
Have one can be in exhaust flow rotating object 4 and object 4 scribble the equipment of the coating of catalyzer to small part;
Have one can be in exhaust flow rotating object 4 and one be located at filter 6 in the object 4 and object 4 scribble the equipment of the coating of catalyzer to small part.

Claims (32)

1. be used for the equipment of the engine exhaust reprocessing of internal-combustion engine, it is characterized in that, this equipment has an object (4) that the groove of being crossed by exhaust flow (3) is arranged on it, and this object (4) is to be located in the exhaust flow pivotally.
2. according to the described equipment of claim 1, it is characterized in that, have a flow channel, this flow channel flows with a scope (B1) of the groove (3) of object (4) and is communicated with.
3. according to the described equipment of claim 2, it is characterized in that, have one and flow to be communicated with, this flow be communicated with the scope (B1) of being flowed through of groove (3) by flow channel outlet side is communicated with and make scope (B1) and groove (3) one with the mobile connection of the mobile scope (B2) that is communicated with of flow channel.
4. according to the described equipment of one of above claim, it is characterized in that, object (4) is divided into two scope (B1, B2), wherein, waste gas is gone up first scope (B1) that flows at the front-end face (2) of object (4), ear end face (5) at first scope (B1) is gone up outflow, flow into an end face (5) of second scope (B2) and leave second scope (B2) on other end (2), wherein, object (4) turns round around an axle that is substantially perpendicular to the flow direction of exhaust flow during flowing through.
5. according to the described equipment of one of above claim, it is characterized in that equipment has a filter (6).
6. according to the described equipment of claim 5, it is characterized in that this filter is pivotally, particularly can be provided with pivotally with object (4).
7. according to claim 4 and claim 5 or 6 described equipment, it is characterized in that filter (6) is located between the end face (5) of the ear end face (5) of first scope (B1) and second scope (B2).
8. according to the described equipment of one of above claim, it is characterized in that,, particularly make NO in order to make the harmful matter reduction x, HC and/or CO reduction, object (4) to small part scribbles catalyst layer (T1).
7. according to the described equipment of one of above claim, it is characterized in that object (4) has columniform shape, wherein, groove (3) radially stretches.
8. according to the described equipment of claim 7, it is characterized in that object (4) has a columniform space (7) vertically.
9. according to the described equipment of claim 8, it is characterized in that, in columniform space (7), be provided with filter (6).
10. according to the described equipment of one of above claim, it is characterized in that internal-combustion engine has one and fuel directly sprayed into the injection apparatus of firing chamber and/or is a diesel engine.
11., it is characterized in that equipment has a heating element (11) according to the described equipment of one of above claim.
12., it is characterized in that equipment has a fixing shell (12) according to the described equipment of one of above claim, be provided with in this shell around the rotating object of its longitudinal axis (4).
13., it is characterized in that this shell is made of nonmetallic material according to the described equipment of claim 11.
15., it is characterized in that object (4) rotates by a driver element (9) according to the described equipment of one of above claim.
16., it is characterized in that driver element (9) is configured by a motor according to the described equipment of claim 15.
17., it is characterized in that this driver element is configured by the magnetic field of an outside and the magnet that is located in the shell according to the described equipment of claim 15.
18., it is characterized in that the rotational speed of object (4) is about 0.3 to 10 rev/min according to the described equipment of one of above claim.
19., it is characterized in that object (4) is made of metal or pottery according to the described equipment of one of above claim.
20., it is characterized in that object (4) is a monomer according to the described equipment of one of above claim.
21., it is characterized in that object (4) is made up of the fan-shaped section that is penetrated with groove (3) according to the described equipment of one of above claim.
22., it is characterized in that equipment has a mechanism that is used to inject additional fuel according to the described equipment of one of above claim.
23., it is characterized in that this mechanism that is used for injecting additional fuel is provided in a side of the turning axle (9) of object (4) according to the described equipment of claim 19.
24. be used for the method for the exhaust flow reprocessing of internal-combustion engine, it is characterized in that be provided with an object (4) in exhaust flow, this object (4) is penetrated with groove (3) and is divided into two scopes (B1, B2) along exhaust gas flow direction,
Exhaust flow is imported into the front-end face (2) of first scope (B1),
Exhaust flow is in an end face (5) of second scope that is admitted to (B2) and locates to flow out in the other end (2) of second scope (B2) at the ear end face (5) of first scope (B1), and object (4) is turned round around an axle during operation, makes groove (3) change to second scope (B2) from first scope (B1).
25. in accordance with the method for claim 24, it is characterized in that object (4) turns round around its quilt with such speed, make by the heating of exhaust flow to cause by of the heating of first scope to exhaust flow to second scope (B2).
26. according to claim 24 or 25 described methods, it is characterized in that, the charcoal cigarette particulate of exhaust flow is trapped in that filter (6) between the end face (5) of exhaust gas entrance side of an ear end face (5) that is located at first scope (B1) and second scope (B2) is gone up and rotating speed is so selected, makes the maximum value of temperature front be in filter (6) haply and locates.
27., it is characterized in that NO according to the described method of one of claim 24 to 26 xThe part that correspondingly scribbles catalyst layer (T1) that is stored in object on be carried out.
28. in accordance with the method for claim 27, it is characterized in that the NO that continuous reduction is stored xUndertaken by additionally adding reducing agent.
29. be used for to being designed to NO xMethod exhaust after-treatment-accumulator-type catalytic converter, that be used for internal-combustion engine, that carry out desulfurization by the described equipment of one of above claim, it is characterized in that, when the beginning desulfurization, when the amount of the harmful matter in waste gas increases, the rotation of object (4) is slowed down or is ended, enter or by second scope (B2) until the temperature maximum value that forms, particularly enter or the end face (2) of the waste gas outflow side by second scope (B2) near
Object (4) is turned round, and occupies the position of first scope until second scope (B2) at least most ofly, makes the temperature maximum value mainly be positioned at first scope and rotation is ended, and enters second scope (B2) at least up to the temperature maximum value,
Postinjection is reduced and object (4) is turned round again.
30. in accordance with the method for claim 29, it is characterized in that, slow down or end the revolution repeatedly repeated, taken off sulphur basically up to object (4).
31., it is characterized in that the continuous revolution of object (4) roughly is in two scopes in the temperature maximum value, and (B1 is carried out under the situation at intersection point place B2) again according to claim 29 or 30 described methods.
CN99809069A 1998-07-31 1999-06-17 Method and device for post-treamtent of exhaust gases of an internal combustion engine Pending CN1311844A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19834576.3 1998-07-31
DE19834576 1998-07-31
DE19850762.3 1998-11-04
DE19850762A DE19850762A1 (en) 1998-07-31 1998-11-04 Device and method for aftertreatment of engine exhaust gases from an internal combustion engine

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EP (1) EP1101019A1 (en)
JP (1) JP2002522684A (en)
CN (1) CN1311844A (en)
WO (1) WO2000008310A1 (en)

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CN100387811C (en) * 2003-08-29 2008-05-14 五十铃自动车株式会社 Exhaust gas purifying method and exhaust gas purifying system
CN100445524C (en) * 2004-07-05 2008-12-24 丰田自动车株式会社 Control method and control device for exhaust gas control apparatus
CN105649728A (en) * 2016-01-06 2016-06-08 顾钰锋 Durable three-way catalytic converter
CN106609689A (en) * 2015-10-26 2017-05-03 福特环球技术公司 Methods and systems for rotating an exhaust aftertreatment device
CN107339139A (en) * 2016-04-28 2017-11-10 福特环球技术公司 System and method for soot sensor
CN107694287A (en) * 2017-11-20 2018-02-16 湖州市练市聚丰线缆厂 A kind of enamel-covered wire waste gas filter

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US5974790A (en) 1998-03-05 1999-11-02 Ford Global Technologies, Inc. Catalytic converter decontamination method
GB2436077A (en) * 2006-03-18 2007-09-19 Ford Global Tech Llc An emission control device for an engine

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CN100387811C (en) * 2003-08-29 2008-05-14 五十铃自动车株式会社 Exhaust gas purifying method and exhaust gas purifying system
CN100445524C (en) * 2004-07-05 2008-12-24 丰田自动车株式会社 Control method and control device for exhaust gas control apparatus
CN106609689A (en) * 2015-10-26 2017-05-03 福特环球技术公司 Methods and systems for rotating an exhaust aftertreatment device
CN105649728A (en) * 2016-01-06 2016-06-08 顾钰锋 Durable three-way catalytic converter
CN105649728B (en) * 2016-01-06 2017-12-01 嵊州北航投星空众创科技有限公司 Durable type ternary catalyzing unit
CN107339139A (en) * 2016-04-28 2017-11-10 福特环球技术公司 System and method for soot sensor
CN107339139B (en) * 2016-04-28 2022-01-28 福特环球技术公司 Method for engine and engine exhaust system
CN107694287A (en) * 2017-11-20 2018-02-16 湖州市练市聚丰线缆厂 A kind of enamel-covered wire waste gas filter

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Publication number Publication date
JP2002522684A (en) 2002-07-23
EP1101019A1 (en) 2001-05-23
US20010004831A1 (en) 2001-06-28
WO2000008310A1 (en) 2000-02-17

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