DE102008062417A1 - Exhaust gas cleaning system for cleaning exhaust gas flow of internal combustion engine, has exhaust gas turbine driven by exhaust gas flow - Google Patents

Exhaust gas cleaning system for cleaning exhaust gas flow of internal combustion engine, has exhaust gas turbine driven by exhaust gas flow

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Publication number
DE102008062417A1
DE102008062417A1 DE200810062417 DE102008062417A DE102008062417A1 DE 102008062417 A1 DE102008062417 A1 DE 102008062417A1 DE 200810062417 DE200810062417 DE 200810062417 DE 102008062417 A DE102008062417 A DE 102008062417A DE 102008062417 A1 DE102008062417 A1 DE 102008062417A1
Authority
DE
Germany
Prior art keywords
exhaust gas
stream
exhaust
purification device
means
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE200810062417
Other languages
German (de)
Inventor
Richard Dorenkamp
Thorsten Dr. Düsterdiek
Gerhard Kahmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volkswagen AG
Original Assignee
Volkswagen AG
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 Volkswagen AG filed Critical Volkswagen AG
Priority to DE200810062417 priority Critical patent/DE102008062417A1/en
Publication of DE102008062417A1 publication Critical patent/DE102008062417A1/en
Withdrawn legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust 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
    • F01N3/023Exhaust 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 using means for regenerating the filters, e.g. by burning trapped particles
    • F01N3/027Exhaust 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 using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means
    • F01N3/0275Exhaust 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 using means for regenerating the filters, e.g. by burning trapped particles using electric or magnetic heating means using electric discharge means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust 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
    • F01N13/009Exhaust 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
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021Exhaust 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
    • F01N3/033Exhaust 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 in combination with other devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00Combination 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
    • F01N2240/04Combination 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, e.g. electrostatic, device other than a heater
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2240/00Combination 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
    • F01N2240/28Combination 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 plasma reactor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/10Carbon or carbon oxides

Abstract

The exhaust gas cleaning system has an exhaust gas turbine (9) driven by an exhaust gas flow (7). A catalytic device (11) is provided for catalytic transferring of exhaust gas components, which are carried in the exhaust gas flow. The catalytic device is connected upstream to the exhaust gas turbine, and is passed from the exhaust gas flow. A retained particle is converted with a particle filter (17) by a nitrogen dioxide provided in the exhaust gas flow. An independent claim is also included for a method for cleaning exhaust gas flow of an internal combustion engine with exhaust gas cleaning system.

Description

  • The The invention relates to an exhaust gas purification device for cleaning an exhaust gas stream of an internal combustion engine with at least one means the exhaust gas stream driven exhaust gas turbine and a method for Purification of the exhaust gas flow. The invention further relates to an exhaust gas purification device for Purification of an exhaust gas stream of a stationary fossil fuel burning station.
  • Exhaust gas purification devices for cleaning an exhaust gas stream of an internal combustion engine are known. By means of such exhaust gas purification devices gaseous exhaust gas components such as hydrocarbons, carbon monoxide and nitrogen oxides as well as liquid and solid particles, in particular soot particles, can be removed from the exhaust gas flow. For this purpose, different components such as particulate filters and catalysts can be used. The DE 42 22 087 A1 relates to a diesel engine with a charge air line, in which the compressor of an exhaust gas turbocharger is arranged and an exhaust pipe, in which the exhaust gas turbine of said exhaust gas turbocharger and a particulate filter are arranged, and with an exhaust gas recirculation line, which branches off in the flow direction behind the particulate filter of the exhaust gas turbine from the exhaust pipe and this connects with the charge air line and an exhaust gas cooler in the exhaust gas recirculation line. The particle filter is arranged upstream of the exhaust gas turbine in the flow direction. The EP 1 321 641 B1 relates to an exhaust gas purification system for a diesel engine that cleans a diesel engine exhaust flow of particulates and nitrogen oxides. A first exhaust emission purification device and a second exhaust emission purification device are provided, wherein the second exhaust emission purification device is connected upstream in a bypass passage of an exhaust gas turbine. The EP 1 130 231 A2 shows an apparatus for purifying exhaust gas, in particular exhaust gas from internal combustion engines, with a plasma module subjecting the exhaust gas of an electrical gas discharge and a catalyst, in which the exhaust gas comes into contact with catalytic material. The plasma module is arranged upstream of the catalyst in terms of flow. The EP 1 582 711 B1 relates to an apparatus and a method, which make it possible in a produced by an internal combustion engine exhaust gas entrained particles and nitrogen oxides by means of plasma and catalysts. The US Pat. No. 6,233,926 B1 relates to an apparatus and method for removing or filtering particles from a combustion exhaust stream and / or for regenerating a flow particle filter by means of an incoming stream of exhaust gas. The DE 100 20 555 A1 shows a method for purifying exhaust gases of an internal combustion engine. The exhaust gas is introduced into an oxidation catalyst, electrically applied, wherein the particulate pollutants are electrically charged or polarized, separated and burned by means located in the exhaust NO2's.
  • task The invention is an improved cleaning of an exhaust stream an internal combustion engine with at least one drivable by means of the exhaust gas stream Allow exhaust gas turbine, in particular particulate emissions continue to reduce.
  • The Task is in an emission control device for cleaning a Exhaust gas stream of an internal combustion engine with at least one means the exhaust gas stream driven exhaust gas turbine, with one of the exhaust gas turbine upstream and can be flowed through by the exhaust stream Catalyst device for catalytically reacting carried in the exhaust stream Exhaust gas components and one of the exhaust stream at least partially unhindered flow through particle filter for reducing of entrained in the exhaust stream particles. Be beneficial In front of the exhaust gas turbine faster exhaust gas temperatures achieved for the catalytic reaction are necessary. Advantageously results an improved starting behavior. In addition, the advantageous Particle filter a degree of separation for entrained particles increase. Particles can be liquid or solid exhaust gas components, in particular soot particles, the exhaust stream to be understood. The particle filter can be the particle number reduce, in particular, withhold these and / or chemically implement. A partially permeable particle filter may have at least one fluid path through which the exhaust stream unhindered the particle filter can flow through. It can including an open and / or semi-open particle filter understood become. Further, under the particulate filter, a catalyst particle filter be understood. Advantageously, the particulate filter can not If necessary, even at a maximum particle loading the at least one fluid path remains open. In the internal combustion engine It can be a gasoline engine or a diesel engine or a Motor with features of both act, especially one with a lean one Mixture composition operable engine. Furthermore, the internal combustion engine have a double charge. In this case, the catalyst device before at least one of the exhaust gas turbines or both of the exhaust gas turbines be provided. Especially with a double charging can Catalyst device achieve special advantages, since after give the exhaust gas turbines comparatively low exhaust gas temperatures.
  • In one exemplary embodiment, the exhaust gas purification device is provided with an oxidation catalytic converter connected downstream of the exhaust gas turbine and through which the exhaust gas flow can flow in order to oxidize the exhaust gas components entrained in the exhaust gas flow. By means of the oxidation catalyst tors advantageous hydrocarbons and / or carbon monoxide can be implemented.
  • at a further embodiment of the exhaust gas purification device is provided that the retained particles within the open and / or semi-open particulate filter means in the exhaust stream contained NO2 are implemented. Advantageously, by means of continuous Regeneration (CRT) a particle loading of the particulate filter continuously be dismantled again. Advantageous are complex filter regeneration cycles not necessary or at least very rarely.
  • at a further embodiment of the exhaust gas purification device is provided that the particulate filter downstream of the Oxidation catalyst is arranged. Advantageously, by means of the oxidation catalyst produces additional NO2, by means of which the soot particles can be converted in the particle filter are. Be advantageous by means of the particulate filter and the continuous Regeneration small and smallest soot particles preferred and in implemented to a high degree.
  • at a further embodiment of the exhaust gas purification device is provided that the particulate filter downstream of the Exhaust gas turbine is arranged. Advantageously enough for filtering and also continuous reaction of the particles comparatively low temperatures, so not for the particulate filter the comparatively small installation space in the area of a bend, that is, upstream of the exhaust gas turbine of the internal combustion engine must be used.
  • at a further embodiment of the exhaust gas purification device it is provided that the particle filter is a Nebenstromtiefbettfilter having. By means of a Nebenstromtiefbettfilters can be advantageous very large maintenance-free life, so for example very high mileage when used in motor vehicles, be achieved.
  • at a further embodiment of the exhaust gas purification device it is provided that the open particle filter can be flowed through by the exhaust gas flow Plasma unit for generating a plasma within the exhaust stream is downstream. Advantageously, by means of the plasma additionally exhaust gas components, in particular possibly the particulate filter passing soot particles to be implemented. Under a plasma can a mixture of charged particles, in particular electrons and protons, be understood. It can also be a so-called complex plasma be understood that also particles, especially liquid or solid. Advantageous are plasmon electrons usually more mobile than the much heavier protons, so that particles contained in the plasma more frequently by electrons be taken and therefore usually in complex plasmas have a negative charge. The plasma unit can be the plasma by any method, for example a barrier discharge, Gas discharge, pulsed corona discharge, a dielectric barrier Discharge and / or others generate. It is conceivable, the plasma unit an electrically closed filter that contains the charged particles collected by means of electrostatic forces of attraction, nachzuschalten.
  • at a further embodiment of the exhaust gas purification device is provided that the exhaust gas flow by means of at least one element of The following group is preheatable: a motor preheater, a electric heater, a burner, a fuel metering device. The burner can be used, for example, as a bypass burner or main flow burner be executed. Advantageously, by means of preheating an exhaust gas temperature increases and thus a conversion rate the exhaust gas purification device can be improved.
  • at a further embodiment of the exhaust gas purification device it is provided that by means of the plasma unit in the exhaust gas stream entrained particles are reducible. Can be advantageous activated by the plasma, the exhaust gas components of the exhaust stream be, so especially at low temperatures, for example shortly after starting the internal combustion engine, nevertheless high conversion rates possible are. It is conceivable that the plasma unit only during a cold start phase of the internal combustion engine zuzuschalten to This phase also to achieve a particularly exhaust gas purification.
  • The Task is also in an emission control device a fixed fossil burning point for cleaning an exhaust gas stream the stationary fossil burning station, with one of the burners downstream Fluid path for guiding the exhaust stream, one of the focal point downstream and flowed through by the exhaust stream Plasma unit for generating a plasma within the exhaust stream and an open flow through the exhaust gas flow electrical Particle filter for the electrostatic collection of entrained in the exhaust stream Solved particles. Advantageously, the particles safely be removed from the exhaust stream. Under a fire may for example be understood as a fireplace of a power plant or a domestic fire become. Such burners are usually beneficial stationary operated. The exhaust gas purification device can advantageous for such stationary operation be optimized.
  • In one embodiment of the exhaust gas purification device is provided that electro Static charged particles of the plasma can be collected by means of the particle filter. The particulate filter can attract the charged soot particles and hold them for collection. When reaching a maximum load, the particulate filter can be changed or regenerated if necessary.
  • The Task is also in a method for cleaning a Exhaust gas stream of an internal combustion engine with at least one means the exhaust gas stream driven exhaust gas turbine, with a catalytic Converting exhaust gas components entrained in the exhaust stream upstream of the exhaust gas turbine by means of one of the exhaust gas turbine upstream and can be flowed through by the exhaust stream Catalyst device and reducing in the exhaust stream entrained particles downstream of the exhaust gas turbine by means of one of the exhaust gas turbine downstream at least partially from the exhaust stream freely permeable open and / or semi-open particle filter. Advantageously, especially after a cold start of the internal combustion engine a particularly good emission control respectively. The method may be by means of a previously described exhaust gas purification device be performed. In this respect, the previously described Advantages.
  • Further Advantages, features and details emerge from the following Description, in reference to the drawing, an embodiment is described in detail. Same, similar and / or functionally identical parts are provided with the same reference numerals. Show it:
  • 1 an internal combustion engine with a downstream exhaust gas purification device having an open particle filter;
  • 2 an internal combustion engine with a further exhaust gas purification device, in contrast to the representation according to 1 additionally has a downstream plasma unit;
  • 3 a fossil burner with a downstream exhaust gas purification device having an electric particle filter.
  • 1 shows an exhaust gas purification device 1 , an internal combustion engine 3 , In the internal combustion engine 3 For example, it may be a diesel engine with a lean mixture composition. The exhaust gas purification device has a fluid path 5 for guiding an exhaust gas flow 7 the internal combustion engine 3 on. In the exhaust gas flow 7 the internal combustion engine 3 is an exhaust gas turbine 9 a not shown exhaust gas turbocharger of the internal combustion engine 3 connected. Between the internal combustion engine 3 and the exhaust gas turbine 9 is a catalyst device 11 connected. The catalyst device 11 has a total of four individual catalysts 13 on, in a not shown manifold of the internal combustion engine 3 are switched. The internal combustion engine 3 may for example have four cylinders, each cylinder each one of the catalysts 13 the catalyst device 11 is downstream. However, it is also conceivable that the catalyst device 11 only a single, the manifold of the internal combustion engine 3 downstream and the exhaust gas turbine 9 having upstream catalyst. The exhaust gas turbine 9 is an oxidation catalyst 15 downstream. By means of the oxidation catalyst 15 can in the exhaust stream 7 entrained exhaust gas components are oxidized, for example hydrocarbons and / or carbon monoxide. The catalyst device 11 may also be designed to react oxidizable exhaust gas components. The catalyst device 11 but can also alternatively and / or in addition to reducing reducible exhaust gas components of the exhaust stream 7 , For example, nitrogen oxides, be designed.
  • The oxidation catalyst 15 is one of the exhaust gas flow 7 at least partially unhindered through-flow particle filter 17 downstream. By means of the particle filter 17 can solid or liquid components, in particular soot particles, the exhaust stream 7 be retained and / or implemented. The particle filter 17 may be designed as open or semi-open, in particular Nebenstromtiefbetffilter. Advantageously, it is possible that in the exhaust stream 7 to retain entrained particles and / or to oxidize with the aid of nitrogen dioxide. The particle filter 17 can therefore advantageously be regenerated continuously (CRT). Advantageously, by means of the upstream oxidation catalyst 15 a nitrogen dioxide concentration of the exhaust gas stream are raised, so that a particularly good implementation of the soot particles by means of the particulate filter 17 is possible. In addition, advantageous thermal loads of the exhaust gas purification device 1 minimized, since thermal regeneration cycles are not or only rarely necessary. It is conceivable the particle filter 17 further downstream, not shown exhaust gas purification components, for example, based on the principle of a selective catalytic reduction and / or NOX storage nachzuschalten.
  • Advantageously, even in a dynamic operation of the internal combustion engine 3 a self-regeneration of the exhaust gas purification device 1 , in particular the particulate filter 17 , respectively. It is possible, if the self-regeneration is not sufficient, a separate regeneration cycle, for example, raising a temperature of the exhaust gas flow 7 , for regeneration of the particulate filter 17 perform. For this purpose, not shown devices, such as an electric heater, a ne benstrombrenner, a main flow burner and / or a fuel injection to be associated with the exhaust stream. Furthermore, it is conceivable by means of engine measures of the internal combustion engine 3 the temperature of the exhaust stream 7 to raise. For the catalysts 13 the catalyst device 11 are so-called pre-turbocharger catalysts (PTC). Advantageously carry in the manifold of the internal combustion engine, not shown 3 prevailing conditions for a rapid achievement of a reaction temperature, so that advantageously there already hydrocarbons and carbon monoxide are catalytically implemented. Advantageously, a nitrogen dioxide formation is thereby promoted, which is a subsequent soot oxidation, in particular by means of the particulate filter 17 , improved. Advantageously, the downstream particle filter 17 makes the job easier. Advantageously, in order to save scarce space, the four individual catalysts 13 directly in the manifold, not shown, ie, close to a respective exhaust valve, also not shown, are provided. These are operating states of the internal combustion engine 3 conceivable, for. As a so-called stop-and-go operation, the low temperatures of the exhaust stream 7 being able to lead. In this case, it may happen that a loading limit of the particulate filter 17 is exceeded. To counteract this, the temperature of the exhaust gas flow can 7 be raised advantageously by means of a motorized action, such as a targeted fuel injection or fuel post-injection. Advantageously, stricter legal requirements can be met.
  • In the 1 illustrated exhaust purification device 1 is favorably due to a CRT effect, with soot oxidation taking place by means of nitrogen dioxide. Advantageously, by means of the upstream catalyst device with the catalysts 13 (PTC) a the oxidation catalyst 15 supplied hydrocarbon concentration can be significantly reduced. This can happen with the catalysts 13 also to act oxidation catalysts. A nitrogen dioxide formation on the oxidation catalyst is advantageous 15 clearly improved. Advantageously, passive soot oxidation can begin sooner and is more effective. The catalysts 13 the catalyst device 11 can in not shown exhaust ducts of individual not shown in detail cylinder of the engine 3 or as a component in a combination of a manifold of the internal combustion engine, not shown 3 be used. Downstream in the further course of the fluid path 5 the exhaust gas purification device 1 are the exhaust gas turbine 9 , the oxidation catalyst 15 or diesel oxidation catalyst and the semi-open particle filter 17 ,
  • Advantageously, even under extreme driving conditions (eg stop-and-go), where due to low exhaust gas temperatures of the exhaust stream 7 insufficient nitrogen dioxide is formed, a decrease in the efficiency of the open system can be reduced. For this purpose, a motorized filter regeneration can be carried out, wherein the exhaust gas temperature of the exhaust gas flow 7 briefly, for example by means of engine measures, in particular a post-injection, can be raised to about 600 ° C for soot combustion, advantageously an initial efficiency can be restored. Advantageously, strict statutory limits can be met by these measures.
  • 2 shows another exhaust gas purification device 1 an internal combustion engine 3 which is essentially the same as the one in 1 shown. In the following, only the differences are discussed. In contrast to the representation according to 1 has the exhaust gas purification device 1 according to 2 a the particle filter 17 downstream plasma unit 19 on. Advantageously, by means of the plasma unit 19 a plasma in the exhaust stream 7 be generated. It is possible on the one hand, possibly not filtered particles of the particulate filter 17 charge and / or activate. Furthermore, further components of the exhaust gas flow 7 activated, in particular ionized and / or generated radicals. Advantageously, this can also be a reduction of an activation energy and / or a minimum temperature for a reaction carried out Advantageously, the plasma unit 19 at a cold start of the internal combustion engine 3 Carry out an emission control. It is conceivable, the plasma unit 19 , which may be designed to be electrically operable, for example, only zuzuschalten in such operating conditions. The plasma unit 19 For example, it can generate the plasma by means of a dielectrically impeded discharge.
  • The plasma unit is advantageous 19 the particle filter 17 downstream and may possibly be the particulate filter 17 reduce passing particles, in particular adsorb. As a result, even better exhaust gas values can advantageously be achieved. In particular, a particle reduction by about 30 percent is possible. In addition to a good conversion rate for carbon monoxide and hydrocarbons and a particle emissions can be significantly improved. In addition, an otherwise necessary burning off of the filter load of the particulate filter can be advantageous 17 be minimized by means of the continuous regeneration, wherein advantageously a necessary fuel consumption can be reduced. In addition, it is conceivable to completely dispense with otherwise customary system components, for example exhaust gas purification by means of a selective catalytic reduction (SCR system). Advantageously, the in 2 also shown for exhaust gas purification device Internal combustion engines 3 be used with spark ignition, which operate on the Otto principle, since advantageous particles of any kind by a plasma field of the plasma unit 19 electrically charged and can be absorbed.
  • Advantageously, the according to 2 working exhaust gas purification device to achieve consumption advantages, with a clogging of the particulate filter 17 safely preventable. In addition, an exhaust gas purification is possible even in a low temperature range.
  • 3 shows a fossil burner 21 with a downstream exhaust gas purification device 1 , At the fossil fuel station 21 it may be, for example, a power plant firing or a house fire. The exhaust gas purification device 1 the fossil fuel station 21 has a plasma unit 19 for generating a plasma within the exhaust stream 7 the fossil fuel station 21 on. By means of the plasma unit 19 For example, a complex plasma can be generated, wherein entrained particles, in particular soot particles can be negatively charged. In addition, by means of the plasma unit 19 an implementation of in the exhaust stream 7 carried entrained exhaust gas components. The plasma unit 19 is an electric particle filter 23 downstream. The electric particle filter 23 is designed as an open filter, so can flow through the exhaust gas flow quasi unhindered. Electric is the electric particle filter 23 However, a closed system, wherein by means of electrostatic forces or within the electric particle filter 23 producible electric field by means of the upstream plasma unit 19 electrostatically charged particles by means of an anode, not shown, of the electric particle filter 23 be attracted, detained and / or collected. The electric particle filter 23 is a chimney 25 as part of the fluid path 5 for discharging the exhaust gas flow 7 downstream into an environment.
  • Optionally it is possible between the fossil burner 21 and the plasma unit 19 a catalyst 27 for reacting in the exhaust stream 7 interposed with entrained exhaust gas components. Also optionally, it is possible by means of a Zuheizeinheit 29 and additional amounts of fuel, a temperature of the exhaust stream 7 to raise.
  • The fossil focal point 21 can be operated stationary, for example on test stands and / or chimneys. Advantageously, downstream of a power generation, the plasma unit 19 can be used, which can charge and collect particles electrically. Advantageously, residual particles through the downstream open electric particle filter 23 , which is similar to the upstream plasma unit 19 works, be guided. Advantageously, when reaching a maximum filter load, the electric particle filter 23 exchanged and / or regenerated and / or externally regenerated.
  • Advantageously, the in 3 shown exhaust gas purification device used in stationary operation, in which usually required for a Rußabbrand exhaust gas temperature of the exhaust gas stream 600 ° C. 7 can not be reached. Advantageously, in comparison to known open systems, a significantly better degree of separation can be realized. Advantageously, no separate burner is required. By means of the optional catalyst 27 , which may also be designed as an oxidation catalyst, can additionally carbon monoxide and hydrocarbons from the exhaust stream 7 be removed. Optionally, it is conceivable to increase the temperature of the exhaust gas flow by means of additional fuel 7 make.
  • 1
    exhaust gas purification device
    3
    Internal combustion engine
    5
    fluid path
    7
    exhaust gas flow
    9
    exhaust turbine
    11
    catalyst device
    13
    catalysts
    15
    oxidation catalyst
    17
    particulate Filter
    19
    plasma unit
    21
    fossil focal point
    23
    electrical particulate Filter
    25
    chimney
    27
    catalyst
    29
    Zuheizeinheit
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
  • Cited patent literature
    • - DE 4222087 A1 [0002]
    • - EP 1321641 B1 [0002]
    • EP 1130231 A2 [0002]
    • EP 1582711 B1 [0002]
    • - US 6233926 B1 [0002]
    • - DE 10020555 A1 [0002]

Claims (12)

  1. Exhaust gas purification device ( 1 ) for purifying an exhaust gas stream ( 7 ) an internal combustion engine ( 3 ) with at least one by means of the exhaust gas stream ( 7 ) drivable exhaust gas turbine ( 9 ), with: - one of the exhaust gas turbines ( 9 ) upstream of the exhaust stream ( 7 ) throughflowable catalyst device ( 11 ) for catalytically reacting in the exhaust stream ( 7 ) entrained exhaust gas components, - one of the exhaust gas flow ( 7 ) at least partially unhindered through-flow particle filter ( 17 ) for reducing in the exhaust stream ( 7 ) entrained particles.
  2. Exhaust gas purification device according to the preceding claim, with one of the exhaust gas turbine ( 9 ) downstream of the exhaust stream ( 7 ) throughflowable oxidation catalyst ( 15 ) for oxidizing in the exhaust stream ( 7 ) entrained exhaust gas components.
  3. Exhaust gas purification device according to the preceding claim, wherein the retained particles within the particulate filter ( 17 ) by means of in the exhaust gas stream ( 7 ) contained nitrogen dioxide (NO2) are implemented.
  4. Exhaust gas purification device according to one of the preceding claims 2 or 3, wherein the particulate filter ( 17 ) downstream of the oxidation catalyst ( 15 ) is arranged.
  5. Exhaust gas purification device according to one of the preceding claims, wherein the particulate filter ( 17 ) downstream of the exhaust gas turbine ( 9 ) is arranged.
  6. Exhaust gas purification device according to one of the preceding claims, wherein the particulate filter ( 17 ) has a Nebenstromtiefbettfilter.
  7. Exhaust gas purification device according to one of the preceding claims, wherein the particulate filter ( 17 ) one of the exhaust gas flow ( 7 ) flow through plasma unit ( 19 ) for generating a plasma within the exhaust stream ( 7 ) is connected downstream.
  8. Exhaust gas purification device according to one of the preceding claims, wherein the exhaust gas flow ( 7 ) is preheatable by means of at least one element of the following group: a motor preheater, an electric heater, a burner, a Brennstoffzudosiervorrichtung.
  9. Exhaust gas purification device according to one of the preceding two claims, wherein by means of the plasma unit ( 19 ) in the exhaust stream ( 7 ) entrained particles are reducible.
  10. Exhaust gas purification device ( 1 ) a fixed combustion station for purifying an exhaust gas stream ( 7 ) of the stationary burner ( 21 ), with: - one of the burners ( 21 ) downstream fluid path ( 5 ) for guiding the exhaust gas flow ( 7 ), - one of the burners ( 21 ) downstream of the exhaust stream ( 7 ) throughflowable plasma unit ( 19 ) for generating a plasma within the exhaust stream ( 7 ), - one of the exhaust gas flow ( 7 ) open through-flow electrical particle filter ( 23 ) for electrostatically collecting in the exhaust stream ( 7 ) entrained particles.
  11. Exhaust gas purification device according to the preceding claim, wherein electrostatically charged particles of the plasma by means of the electric particle filter ( 23 ) are collectable.
  12. Method for purifying an exhaust gas stream ( 7 ) an internal combustion engine ( 3 ) with at least one by means of the exhaust gas stream ( 7 ) drivable exhaust gas turbine ( 9 ), comprising: - catalytically reacting in the exhaust gas stream ( 7 ) entrained exhaust gas components upstream of the exhaust gas turbine ( 7 ) by means of one of the exhaust gas turbine ( 7 ) upstream of the exhaust stream ( 7 ) throughflowable catalyst device ( 11 ), - reducing in the exhaust stream ( 7 ) entrained particles downstream of the exhaust gas turbine ( 9 ) by means of one of the exhaust gas turbine ( 9 ) downstream at least partially from the exhaust gas flow ( 7 ) freely traversable particle filter ( 17 ).
DE200810062417 2008-12-17 2008-12-17 Exhaust gas cleaning system for cleaning exhaust gas flow of internal combustion engine, has exhaust gas turbine driven by exhaust gas flow Withdrawn DE102008062417A1 (en)

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EP2803846A1 (en) 2013-05-16 2014-11-19 MAN Truck & Bus AG Driving device and method for operating the same using a partially oxidised diesel fuel
DE102017118214A1 (en) * 2017-08-10 2019-02-14 Volkswagen Aktiengesellschaft Exhaust gas aftertreatment system and method for exhaust aftertreatment of an internal combustion engine

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EP2803846A1 (en) 2013-05-16 2014-11-19 MAN Truck & Bus AG Driving device and method for operating the same using a partially oxidised diesel fuel
DE102013008367A1 (en) 2013-05-16 2014-11-20 Man Truck & Bus Ag Drive device and method for operating the same using a partially oxidized diesel fuel
DE102017118214A1 (en) * 2017-08-10 2019-02-14 Volkswagen Aktiengesellschaft Exhaust gas aftertreatment system and method for exhaust aftertreatment of an internal combustion engine

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