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WO1999017005A1 - Procede et dispositif pour la purification des gaz d'echappement d'une installation a combustion - Google Patents

Procede et dispositif pour la purification des gaz d'echappement d'une installation a combustion Download PDF

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Publication number
WO1999017005A1
WO1999017005A1 PCT/DE1998/002779 DE9802779W WO9917005A1 WO 1999017005 A1 WO1999017005 A1 WO 1999017005A1 DE 9802779 W DE9802779 W DE 9802779W WO 9917005 A1 WO9917005 A1 WO 9917005A1
Authority
WO
WIPO (PCT)
Prior art keywords
fuel
exhaust gas
catalyst
temperature
catalytic converter
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.)
Ceased
Application number
PCT/DE1998/002779
Other languages
German (de)
English (en)
Inventor
Ronald Neufert
Klaus Wenzlawski
Dietmar Weisensel
Günther PAJONK
Winfried DÖLLING
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of WO1999017005A1 publication Critical patent/WO1999017005A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion
    • F01N3/206—Adding periodically or continuously substances to exhaust gases for promoting purification, e.g. catalytic material in liquid form, NOx reducing agents
    • F01N3/2066—Selective catalytic reduction [SCR]
    • 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
    • B01D53/9404—Removing only nitrogen compounds
    • B01D53/9409—Nitrogen oxides
    • B01D53/9431—Processes 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
    • B01D53/92—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
    • B01D53/9495—Controlling the catalytic process
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2033—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using a fuel burner or introducing fuel into exhaust duct
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/204—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using an exhaust gas igniter, e.g. a spark or glow plug, without introducing fuel into exhaust duct
    • 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
    • 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
    • F01N3/36—Arrangements for supply of additional fuel
    • 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
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a method and a device for reducing pollutants in the exhaust gas of an incinerator, in particular an internal combustion engine, preferably a diesel engine operated with diesel fuel.
  • pollutants can arise to a not inconsiderable extent, which are released into the environment via the exhaust gas and can cause damage there.
  • DE 43 109 26 A has proposed that the exhaust gas of an internal combustion engine to be treated be passed through a branch of the exhaust pipe before flowing through the catalytic converter and there, with the aid of a separately arranged heating device, e.g. an electric heater or a blue burner.
  • a separately arranged heating device e.g. an electric heater or a blue burner.
  • a disadvantage of the said heater and the Kuhlein- direction is that the exhaust gas for setting the desired temperature of the cooling or heating needs to be supplied via a complicated system of valves and deflectors with ⁇ means of various branches.
  • the associated, moreover technically difficult to realize ification Mo ⁇ the exhaust pipe leads to a substantial increase in exhaust back pressure, which consuming to an unwanted majority leads a so equipped incinerator.
  • the increased space requirements prove to be particularly disadvantageous.
  • the retrofitting of an existing incinerator with such a system also causes considerable effort, which is associated with high costs.
  • DE 196 26 836 A discloses a method for denitrifying the exhaust gases of a diesel engine using a NOx storage catalytic converter.
  • the exhaust gas is passed through an additional branch.
  • fuel is introduced into the exhaust gas and oxidized on an oxidation catalytic converter.
  • An additional oxidation catalyst is required.
  • the object of the invention is to provide a method and a device for cleaning the exhaust gas of an incineration plant, in particular an internal combustion engine, such as e.g. a diesel engine, which enables an effective catalytic conversion of the pollutants contained in the exhaust gas even with load changes and fluctuating exhaust gas temperatures. This should be done with a small space requirement and particularly easy to implement technical means.
  • an internal combustion engine such as e.g. a diesel engine
  • the first-mentioned object is achieved by a method for purifying the exhaust gas of a fuel-operated combustion system, in which the exhaust gas is passed through a catalytic converter via an exhaust gas line, according to the invention by means of a cold start and / or during or after an idling phase of the combustion system insertion device arranged on the exhaust gas line specifically m the fuel fed into the exhaust gas line, in particular fuel and / or by operating the incineration system with an excess of fuel specifically m the fuel fed into the exhaust gas line and / or as a fuel which in the exhaust gas during normal operation of the incinerator, the unburned portions from the fuel, in particular hydrocarbons, are ignited in the inlet area of the catalytic converter or in the catalytic converter, as a result of which the exhaust gas flowing into the catalytic converter or in the catalytic converter is heated and heats up the catalytic converter.
  • fuel is understood to mean any substance contained in or introduced into the exhaust gas, which by ignition contributes to increasing the exhaust gas temperature.
  • a fuel that is specifically fed into the exhaust gas line and is intended to ignite is also referred to as fuel, as is the unburned portions of the fuel contained in the exhaust gas if these are ignited to heat the catalytic converter.
  • the invention is based on the consideration that a rapid increase in the exhaust gas temperature before flowing through the catalyst leads to a rapid increase in the catalyst temperature and thus the operating temperature of the catalyst, i.e. the temperature at which an effective pollutant conversion is achieved, especially when there is a positive load jump.
  • a Burn ⁇ incineration plant during normal operation particularly an internal combustion engine such as a diesel engine, with positive load transients, such as the "cold start” or the “full throttle” for an "idle phase” increased unburned fuel components, such as hydrocarbons.
  • unburned fuel components also known as white smoke
  • a catalytic converter can be used as fuel to increase the exhaust gas temperature.
  • an appropriate ignition device of this fuel can in the inlet region of the catalyst or the catalyst at EXISTING ⁇ densein be ignited by residual oxygen, whereby the waste gas temperature is raised directly at the catalyst.
  • additional or separate fuel can be introduced directly into the exhaust gas in front of the ignition device. This can be done, for example, by blowing, injecting or embedding. Additionally or alternatively, the fuel can be specifically fed in that excess fuel is fed to the incineration plant. The introduction of an additional amount of fuel then leads in the incineration plant to the formation of white smoke, which serves as fuel to increase the exhaust gas temperature. In this way, it is also possible to provide the fuel in the exhaust gas without additional components and without taking up additional installation space.
  • the fuel is advantageously fed in by means of an emission device arranged on the exhaust gas line in a targeted manner m the exhaust gas line and thus m the exhaust gas.
  • the fuel of the incinerator itself or another highly flammable fluid, such as e.g. Methane or natural gas can be used.
  • the fuel directly introduced into the exhaust gas and / or emitted by the combustion system is ignited if necessary in the inlet area of the catalytic converter or directly in the catalytic converter, as a result of which the catalytic converter is heated up uniformly and rapidly to its operating temperature, which leads to efficient decomposition of the Exhaust gas contains pollutants even at low exhaust gas temperatures, e.g. during the start-up phase of the incinerator.
  • the temperature of the catalyst can advantageously be influenced by admixing a cooling fluid in order to keep the temperature of the catalyst within a desired range. This can increase the temperature of the talysators or its temperature can be slowed down or reduced.
  • the exhaust gas can also be admixed as a cooling fluid with the reducing agent which is used in the exhaust gas purification according to the selective catalytic reduction ( SCR process) is used to reduce nitrogen oxides.
  • This reducing agent can be, for example, an aqueous urea solution which is injected into the exhaust gas.
  • the targeted feeding of fuel m the exhaust gas is throttled or stopped and / or the ignition device is switched off when the catalytic converter has reached a predetermined maximum temperature.
  • the cooling fluid can be injected into the exhaust gas if the maximum temperature is exceeded.
  • This method makes it possible to temper the catalytic converter largely independently of the current load situation of the incineration plant and the associated exhaust gas temperatures so that the catalytic converter temperature is within a desired range, which ensures efficient catalytic degradation of the pollutants contained in the exhaust gas.
  • the necessary temperature detection can be done, for example, using a suitable temperature sensor located on the catalytic converter, e.g. a thermocouple such as NiCr-Ni or Pt 100.
  • the second-mentioned object relating to the device is achieved according to the invention by a device for cleaning the exhaust gas of a combustion system, in particular an internal combustion engine, preferably a diesel engine, with an exhaust pipe, with a catalytic converter for removing pollutants contained in the exhaust gas, with a device for introducing one Fuel m the exhaust gas, with a between the device for introducing the fuel and the catalytic converter Tor or directly on the catalyst arranged ignition device for igniting the fuel and with a control unit for monitoring the device for introducing the fuel and the ignition device.
  • a device for cleaning the exhaust gas of a combustion system in particular an internal combustion engine, preferably a diesel engine, with an exhaust pipe, with a catalytic converter for removing pollutants contained in the exhaust gas, with a device for introducing one Fuel m the exhaust gas, with a between the device for introducing the fuel and the catalytic converter Tor or directly on the catalyst arranged ignition device for igniting the fuel and with a control unit for monitoring the device for introducing the fuel
  • the device for introducing the fuel into the exhaust gas comprises the combustion system, in particular the internal combustion engine.
  • the combustion system in particular the internal combustion engine.
  • white smoke is increasingly formed, which can then serve as a fuel in inflammation to increase the catalyst temperature.
  • this can serve for the targeted injection of diesel fuel and thus for an increased formation of white smoke.
  • the introduction of fuel into the exhaust gas can be done so without ⁇ additional components and without stress additional installation space.
  • an existing electronic engine control system as is present in modern engines, can be used as a control unit.
  • the device for introducing fuel into the exhaust gas can additionally or separately also comprise an injection device arranged between the combustion system, in particular the internal combustion engine, and the catalytic converter for metering the fuel into the exhaust gas.
  • the injection device comprises a storage container for fuel and an injection nozzle connected to it.
  • the fuel of the incineration plant is used as fuel, in the case of a diesel engine, for example, diesel fuel, a separate storage tank for fuel can be dispensed with. Except for the additional injection nozzle to be implemented, as well as a fuel line from the fuel tank to the injection nozzle and, of course, the ignition device for igniting the fuel, no further structural changes to an existing combustion system are required.
  • the ignition device is arranged between the introduction device for fuel and the catalytic converter or directly on the catalytic converter. This allows the fuel to ignite before or immediately on the catalytic converter.
  • the ignition device is advantageously designed as a glow plug.
  • a device for admixing a fluid cooling the catalytic converter is advantageously arranged between the combustion system and the catalytic converter.
  • the cooling fluid is mixed with the exhaust gas and thereby lowers the temperature of the exhaust gas and thus of the downstream components, in particular the temperature of the downstream catalyst.
  • a temperature sensor is advantageously assigned to the catalytic converter which measures the temperature of the catalytic converter.
  • the temperature sensor is connected to a control unit which makes the ignition device, the device for introducing the fuel and / or the device for admixing the cooling fluid dependent on the
  • Catalyst controls catalyst temperature measured by the temperature sensor.
  • the control Temperature of the catalyst determined using the temperature sensor. If the measured temperature falls below a predetermined minimum temperature, the control unit initiates the targeted introduction of fuel into the exhaust gas or the combustion system itself and sets the ignition device to ignite the fuel to ignite the fuel. If a predetermined maximum temperature is exceeded, the controlled introduction is stopped via the control unit or the ignition device is put out of operation. A cooling fluid may also be introduced if the temperature of the catalyst does not drop quickly enough.
  • the figure shows a diesel engine and an attached device for denitrification of the exhaust gas with a DeNOX catalytic converter, a metering device for an aqueous urea solution and with a device for introducing diesel fuel m the exhaust gas, m the exhaust pipe being an ignition device for igniting the diesel fuel vorese ⁇
  • a diesel engine is shown as a combustion system 1, which is connected to a catalytic converter 5 via an exhaust pipe 3.
  • the catalyst 5 is designed as a DeNOx catalyst based on titanium dioxide with admixtures of vanadium pentoxide, molybdenum trioxide and tungsten trioxide for the decomposition of nitrogen oxides contained in the exhaust gas according to the SCR method, which a temperature sensor 6 for determining the temperature of the catalyst 5 assigned.
  • the temperature sensor is designed as a thermocouple.
  • An ignition device 8 which is designed as a switchable glow plug, is arranged in the exhaust line 3 in the flow direction 7 of the exhaust gas A upstream of the catalytic converter 5. Between of the ignition device 8 and the diesel engine, the exhaust line 3 has a controllable injection nozzle 9 for introducing fuel B into the exhaust gas A of the diesel engine.
  • the fuel K of the diesel engine namely diesel fuel, is used as fuel B and is stored in a fuel tank 11.
  • the controllable injection nozzle 9 is part of an injection device 13, which further comprises a fuel feed line 15 and the fuel tank 11 of the diesel engine.
  • the injection nozzle is connected to a control unit 29 via a control line 31.
  • a metering device for an aqueous reducing agent solution R in this case an aqueous urea solution, is arranged on the exhaust pipe. It comprises a reducing agent tank 19 which is connected via a reducing agent line 21 to a controllable admixing nozzle 23 opening into the exhaust gas line 3. The admixing nozzle 23 is controlled by the control unit 29 via a control line 35. In normal operation, an amount of the urea solution corresponding to the nitrogen oxide concentration is injected so that the nitrogen oxides can be reacted on the catalyst 5 with the ammonia released from the urea without ammonia slip occurring.
  • the metering device is at the same time a device for admixing a cooling fluid, since if the temperature of the catalyst is too high, more urea solution is introduced to cool it. In this case, only insofar increased urea solution introduced ⁇ than not leads to a slip of ammonia.
  • the diesel engine has an injection system 25, which is connected to the fuel tank 11 via a fuel line 27.
  • the injection of the fuel into the diesel K ⁇ motor is also controlled by the control line 37 via the control unit 29th
  • exhaust gas A is produced, which is passed to the catalyst 6 via the exhaust line 3.
  • the unburned fuel components for example hydrocarbons, of which serve as fuel B to increase the exhaust gas temperature.
  • This fuel is ignited in the exhaust pipe 3 in front of the catalytic converter 5 at the ignition device 8 switched on by the control unit 29 and heats the exhaust gas A, which then flows through the catalytic converter 5 and heats it uniformly.
  • the temperature T measured on the catalytic converter 5 is compared in the control unit 29 with a predetermined minimum temperature T 0 .
  • the starting temperature of the catalytic converter 5, ie the temperature at which the catalytic converter achieves approximately 25% of its possible conversion rate, is selected here as the minimum temperature T 0 . If the measured temperature T of the catalyst 5 is below the temperature T, the fuel throughput of the injection system 25 is increased by the control unit 29 via the control line 37. Excess fuel K is thereby supplied to the diesel engine, which increases the proportion of fuel B in the exhaust gas A.
  • the fuel is ignited at the ignition device 8 connected by the control unit 29 via the control line 31, as a result of which the temperature T of the catalytic converter 5 increases.
  • control unit 29 by means of the injection nozzle 9 causes fuel B, in the present case diesel fuel, to be introduced directly into the exhaust gas A.
  • the temperature T of the catalytic converter 5 measured by the temperature sensor 6 exceeds a predetermined maximum temperature Ti, then the targeted introduction of additional fuel K in the diesel engine by the injection system 25 and, if appropriate, the direct introduction of fuel B into the exhaust gas A by the injection device 13 stopped by the control device 29.
  • the ignition device 8 can be switched off by the control device 29.
  • control unit 29 can additionally add aqueous reducing agent solution R from the reducing agent tank 19 in a targeted manner to cool the catalyst 5 into the exhaust gas A via the admixing nozzle 23 of the metering device.
  • the aqueous reducing agent R acts as a cooling fluid on the active surface of the catalyst 5.

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

Abstract

Selon l'invention, il est prévu, dans un dispositif servant à la purification des gaz d'échappement (A) d'une installation à combustion (1), en particulier d'un moteur à combustion interne, d'élever la température d'un catalyseur (5) par allumage du carburant (B) injecté de façon ciblée dans la conduite d'échappement (3) ou bien des fractions de carburant non brûlées contenues dans les gaz d'échappement (A), dans la zone d'entrée du catalyseur (5) ou dans le catalyseur (5) lui-même. Cela permet, même lorsque la température des gaz d'échappement est basse, par exemple lors de la mise en marche de l'installation à combustion (1), une transformation efficace des matières nocives.
PCT/DE1998/002779 1997-09-30 1998-09-18 Procede et dispositif pour la purification des gaz d'echappement d'une installation a combustion Ceased WO1999017005A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19743331 1997-09-30
DE19743331.6 1997-09-30

Publications (1)

Publication Number Publication Date
WO1999017005A1 true WO1999017005A1 (fr) 1999-04-08

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2793522A1 (fr) 1999-05-10 2000-11-17 Univ Abdelmalek Essaadi Dispositif pour pieger les matieres ou produits polluants emis par les fumees d'echappement d'un moteur fonctionnant avec un carburant
WO2001042713A1 (fr) * 1999-12-09 2001-06-14 Robert Bosch Gmbh Dispositif de traitement des gaz d'echappement d'un moteur a combustion interne
FR2919338A1 (fr) * 2007-07-24 2009-01-30 Peugeot Citroen Automobiles Sa Ligne d'echappement de gaz equipee de systemes de depollution pour moteur a combustion interne de vehicule automobile fonctionnant en melange pauvre.
CN103339351A (zh) * 2012-01-04 2013-10-02 丰田自动车株式会社 排气加热方法
EP2229511A4 (fr) * 2008-01-15 2014-11-19 Emcon Technologies Llc Procédé et appareil d'exploitation d'un ensemble de limitation des rejets

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3516360A1 (de) * 1985-05-07 1986-11-13 Didier Engineering Gmbh, 4300 Essen Verfahren zur entfernung von stickoxiden und russ aus verbrennungsabgasen von dieselmaschinen
JPH05187224A (ja) * 1992-01-14 1993-07-27 Hino Motors Ltd メタノールエンジンの始動方法及びそれに用いる酸化触媒装置
JPH06117239A (ja) * 1992-09-30 1994-04-26 Toyota Motor Corp 内燃機関の触媒暖機装置
DE4310926A1 (de) 1993-04-02 1994-10-06 Siemens Ag Vorrichtung und Verfahren zur Schadstoffminderung im Abgas
JPH07323216A (ja) * 1994-05-31 1995-12-12 Babcock Hitachi Kk 排ガスの脱硝方法と装置
DE4436415A1 (de) * 1994-10-12 1996-04-18 Bosch Gmbh Robert Einrichtung zum Nachbehandeln von Abgasen einer selbstzündenden Brennkraftmaschine
US5644913A (en) 1994-12-19 1997-07-08 Ministry Of International Trade And Industry, Agency Of Industrial Science And Technology Heating system for catalytic converter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3516360A1 (de) * 1985-05-07 1986-11-13 Didier Engineering Gmbh, 4300 Essen Verfahren zur entfernung von stickoxiden und russ aus verbrennungsabgasen von dieselmaschinen
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FR2793522A1 (fr) 1999-05-10 2000-11-17 Univ Abdelmalek Essaadi Dispositif pour pieger les matieres ou produits polluants emis par les fumees d'echappement d'un moteur fonctionnant avec un carburant
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CN103339351A (zh) * 2012-01-04 2013-10-02 丰田自动车株式会社 排气加热方法

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