EP2470759A1 - DISPOSITIF POUR LE NETTOYAGE DE GAZ D'ÉCHAPPEMENT CONTENANT DES NOX& xA; - Google Patents

DISPOSITIF POUR LE NETTOYAGE DE GAZ D'ÉCHAPPEMENT CONTENANT DES NOX& xA;

Info

Publication number
EP2470759A1
EP2470759A1 EP10725158A EP10725158A EP2470759A1 EP 2470759 A1 EP2470759 A1 EP 2470759A1 EP 10725158 A EP10725158 A EP 10725158A EP 10725158 A EP10725158 A EP 10725158A EP 2470759 A1 EP2470759 A1 EP 2470759A1
Authority
EP
European Patent Office
Prior art keywords
exhaust gas
gas stream
jacket
channel
exhaust
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Withdrawn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
EP10725158A
Other languages
German (de)
English (en)
Inventor
Sebastian Hirschberg
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.)
Sulzer Chemtech AG
Original Assignee
Sulzer Chemtech 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 Sulzer Chemtech AG filed Critical Sulzer Chemtech AG
Priority to EP10725158A priority Critical patent/EP2470759A1/fr
Publication of EP2470759A1 publication Critical patent/EP2470759A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—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
    • 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
    • B01D53/90—Injecting reactants
    • 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
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/21—Mixing gases with liquids by introducing liquids into gaseous media
    • B01F23/213—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids
    • B01F23/2132—Mixing gases with liquids by introducing liquids into gaseous media by spraying or atomising of the liquids using nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/70—Pre-treatment of the materials to be mixed
    • B01F23/711—Heating materials, e.g. melting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3132—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit by using two or more injector devices
    • B01F25/31322—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit by using two or more injector devices used simultaneously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/313—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit
    • B01F25/3133—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit characterised by the specific design of the injector
    • B01F25/31331—Perforated, multi-opening, with a plurality of holes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • 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
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2067—Urea
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/01—Engine exhaust gases
    • B01D2258/012—Diesel engines and lean burn gasoline engines
    • 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
    • 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
    • F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • 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
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the invention relates to a device for purifying a NOx exhaust gas stream.
  • a DeNoX system is a system for denitrating exhaust gases, ie for the removal of nitrous gases, ie gases with the molecular formula NOx.
  • x can in particular assume the values 1 or 2, that is to say NO, mean NO 2 , non-integer values for x are also possible, for example in a combination as N 2 Os.
  • SCR selective catalytic reaction
  • ammonia NH 3
  • the catalyst one
  • NOx and NH 3 are converted to nitrogen (N 2 ) and water (H 2 O).
  • ammonia can be stored as a water-ammonia mixture or water-urea mixture, which is much safer from a safety point of view. But with this solution is the necessary Apparalive installation and the energy required to evaporate the water-ammonia mixture respectively for evaporation of the water-urea mixture and the subsequent hydrolysis of the urea in ammonia very large. That makes this solution less economically interesting
  • a reaction agent can also be distributed in an exhaust pipe by means of a diaphragm or throttle installed in the interior of a spray pipe, which is shown in DE19946901. This orifice or throttle is to avoid a non-uniform Wandfiim, which forms on the inside of the spray tube.
  • This solution is disadvantageous as a
  • the patent US 7 * ⁇ 9 ⁇ '81 ⁇ B2 describes a method for exhaust gas purification in power plants, in which a part of the exhaust gas flow is diverted. A urea-water solution is added to the branched exhaust gas stream in a separate chamber, evaporated and converted by hydrolysis into ammonia and C ⁇ 2. This partial flow of exhaust gas is then returned by a blower and a static mixer with the main flow mixed. Due to the storage of ammonia in the form of the much less problematic urea and the conversion to ammonia until shortly before use, the risk potential can be considerably reduced, but the Druckveriust increases, which precludes an application of this solution, especially for exhaust gas flows with large volume, because the energy needs an essential one for overcoming pressure ulceration
  • a heating element is provided to evaporate a reactive liquid coming from an injection nozzle. Oxidation reactions are the source of the reactive behavior of the reactive fluid.
  • the chamber of the heating element is provided to evaporate a reactive liquid coming from an injection nozzle. Oxidation reactions are the source of the reactive behavior of the reactive fluid.
  • the chamber of the heating element is provided to evaporate a reactive liquid coming from an injection nozzle. Oxidation reactions are the source of the reactive behavior of the reactive fluid.
  • the atomizing nozzle can be designed as a single-substance nozzle or as a two-component nozzle.
  • the term single-fluid nozzle is used specifically for atomizing nozzles, in which only the liquid to be atomized is conveyed through the nozzle.
  • a propellant gas is also conveyed into the nozzle, as a result of which the atomization can be improved, ie in particular the production of very fine drops with a narrow
  • Liquid flow is possible. However, one is
  • This compression device for the compression of the propellant gas required.
  • This compression device has a high demand for energy, which is especially for large exhaust streams, such as in
  • problems with dust-laden exhaust gases can arise when the dust is wetted by not yet vaporized droplets and accumulates as an impurity on walls of a film evaporator or catalyst or on a static mixer disposed in the exhaust stream upstream of the catalyst.
  • a gas pressure of, for example, 8-8 bar such two-fluid nozzles typically produce
  • Drop size distributions with a Sauter diameter of 20 - 50 ⁇ m, but single large drops of up to 120 ⁇ m. Because of the contamination previously described by the accumulating on the walls dust must be taken to ensure that no drops can get into the catalyst or on the mixer.
  • the time of flight of the droplets before the catalyst or a mixing device must be sufficient so that a complete evaporation of these droplets is ensured and requires correspondingly large length of the exhaust ducts.
  • the time of flight of the drops to the catalyst is only a few milliseconds, which is not sufficient to evaporate larger drops during the flight phase. For this reason, at least the larger drops must be separated from the exhaust gas and vaporized in a liquid.
  • EP 1956206 A provides a film evaporator. In the case of motor vehicles, this is often permissible since a particle filler removes the dust from the exhaust gas in advance and thus there is no longer the risk of contamination.
  • WO 2004/079171 A1 is a combined
  • Evaporator and distributor made up of porous ribs
  • Urea-water solution should be distributed inside the porous structure and evaporated. According to this application, the evaporation energy is extracted from the flow of hot exhaust gas via heat conduction through the fins. Through openings in the ribs then the gaseous ammonia can escape. A large number of such ribs is necessary to remove the heat necessary for the evaporation of the flow of the flow. The proper distribution of the liquid urea water solution to these many fins is technically difficult to realize because of the complex 2-phase flow inside the fins. It's tough
  • the solution should be at least as safe in terms of safety as the use of a two-fluid nozzle.
  • An inventive apparatus for purifying an NOx containing exhaust gas stream comprises a closed channel which NH 3 containing from one Christsrnittel can flow, the channel being a
  • Exhaust opening includes.
  • the jacket element can be flowed around by the exhaust gas flow containing NO x, wherein a distributor element for distributing the NH 3 -containing reaction medium can be connected to the jacket element so that the NH 3 -containing reaction medium can be introduced into the exhaust gas flow and mixed with the exhaust gas flow by means of the distributor element.
  • the upgrading element has one or more openings through which the Nhh-containing reactant can be introduced as a gas phase into the exhaust gas stream.
  • the NH 3 -containing reactant is vaporizable within the Manteielements.
  • the jacket element comprises a heat-transmitting element, so that the jacket element can be heated by means of the exhaust gas flow.
  • the heat-transmitting element may be formed as a rib or a tube.
  • the heat-transferring element as a pipe
  • the heat-transmitting element formed as a tube, which
  • Downstream of the distributor element may be arranged a mixer, in particular a static mixer, in order to mix the exhaust gas stream with the NH 3 -containing reactant.
  • a mixer in particular a static mixer
  • the conversion of NOx with NH 3 to N 2 and H 2 O takes place in a catalyst arranged downstream of the mixer.
  • the catalyst extends over the entire cross-sectional area of an exhaust gas channel leading to the exhaust gas stream, so that the conversion described above along a path as short as possible of the catalyst can take place, thus the length of the catalyst seen in the flow direction of the exhaust gas flow can be as small as possible.
  • the Manteieiement a reactor element for
  • Conversion of urea into MH 3 include, in particular, the
  • Urea be supplied to the reactor element in the liquid phase.
  • the NH 3 -containing reactant according to one of the preceding variants remains in the interior of the jacket element and can only occur in the interior in the liquid state. This ensures that no liquid enters the exhaust gas flow and deposits on the inner surface of the exhaust duct or the heat transfer elements located in the exhaust duct. For this reason, dust particles are not on the inner surface of the
  • Exhaust gas ducts deposited on the jacket element or on the heat-transferring elements.
  • the distribution element for example, the distribution element or a static mixer
  • Reactant is present in the distribution element in the gas phase, it comes downstream of the distribution element to a mixing of NHs-containing reactant with the exhaust gas stream without formation of a liquid
  • the jacket element may contain flow-deflecting internals, in particular, the jacket element may be a metal foam or
  • Ceramic foam included. The heat that has been removed from the exhaust gas flow is distributed by heat conduction throughout the foam.
  • Flow deflecting internals are used for rearrangement or deflection of the flow of Nhh-containing reactant.
  • the combination of heat transfer and heat conduction is for a metal or
  • the metal or ceramic foam is open-pored, so that the entire volume, which is occupied by the metal or Kzmramikaum, for the heat transfer and the deflection or rearrangement of
  • the jacket element as well as the metal or ceramic foam advantageously have a thermal conductivity of at least 15 W / m K, preferably at least 30 W / m K, particularly preferably at least 60 W / m K, so that the heat transfer from the exhaust gas stream to the NH 3 - containing reaction center! additionally improved.
  • the jacket element and / or the metal foam may have a catalytically active surface, in particular if a variant
  • the metal foam may contain aluminum, especially as one
  • Aiuminiumiegêt be formed.
  • a metal foam made of aluminum can be easily manufactured and is therefore relatively inexpensive to procure.
  • the ceramic foam can be embodied, for example, as a silicon carbide ceramic. Silicon carbide has a very high thermal conductivity, high wear resistance and good strength and can be processed into open-pored foam structures.
  • the NH 3 spherical reaction mixture may comprise an aqueous ammonia solution. The aqueous ammonia solution is introduced into the jacket element in the region of the inlet opening. Due to the heat transfer, the water evaporates, so that both the resulting NH 3 , as well as the remaining water in the gaseous phase.
  • the exhaust gas stream may be at least 12 m 3 / h, preferably at least 1000 SiT 3 Zh, more preferably at least 10000 Hi 3 Zh.
  • Inlet temperature of the exhaust gas into the channel is at least 150 of v N >.
  • the channel in which the exhaust gas stream flows may have a cross-sectional area which is at least 0.0007 m 2 , preferably at least 0.05 m z , particularly preferably at least 1 m 2 .
  • Industrial plant in particular a power plant can be used.
  • Other possible uses include denitrification plants for exhaust gases from power plants, for exhaust gases from diesel engines or exhaust gases
  • FIG. 1 shows a schematic view of the device according to the invention.
  • FIG. 2 shows a schematic view of a second embodiment variant of FIG.
  • a closed channel 3 which can be flowed through by a NH3-containing reagent 4.
  • the channel is partially cut in Fig. 1 to make the internals visible.
  • the channel has a jacket element 5. which the channel 3 surrounds and an inlet opening 8 for supplying NH 3- containing
  • the outlet opening 7 opens into a distributing element 8.
  • the holding element 5 can be moved in the direction of the exhaust gas flow 2 containing NOx.
  • a distributing element 8 for distributing the NH 3 -containing reactant 4
  • the distribution element 8 has a hollow interior and one or more openings 9 through which the NH 3 halves
  • Reaction center! 4 as a gas phase in the exhaust stream 2 can be introduced.
  • the NH 3 -containing reactant 4 is vaporizable within the shell element, that is, the NH 3 -containing reactant 4 evaporates in the interior of the shell element
  • the sheath element 5 comprises a
  • FIG. 2 shows a schematic view of a second embodiment of the inventive device. The individual elements of the same function receive the same reference numerals as in FIG. 1.
  • FIG. 2 shows an exhaust gas canister. 14, which includes a device 1 for purifying a NOx-containing
  • Exhaust gas stream 2 contains.
  • a closed channel 3, is traversed by a NH 3- containing reagent 4. This channel 3 is as
  • serpentine running pipe shown.
  • the course of the closed channel 3 does not have to be serpentine, it could, for example, also run helically, which is not shown here.
  • the course of the tube in the exhaust duct 14 is such that the entire
  • Cross-sectional area of the exhaust passage 14 is usable for heat exchange.
  • the exhaust passage 14 is partially cut in Fig. 2 to make the internals visible. Furthermore, the channel 3 is shown cut at two parts to show its internals.
  • a tage ⁇ beriragendes element be attached, which is formed for example as a metal or ceramic foam, but the heat-transferring element may also comprise packing or a combination of different internals.
  • the internals can also be provided only on some sections of the channel.
  • the channel has an inlet opening 6 for the supply of NH 3- containing
  • the outlet opening 7 opens into a Verteilelemenl 8.
  • gehl formed as a tube jacket element directly into a pipe over, soft to
  • Distribution element 8 leads.
  • the distributor 8 is used for distribution of the NH 3 containing reaction means 4, so that the NH 3 containing reactant 4 is introduced into and be mixed with the exhaust gas stream 2 by means of the distributing element in the exhaust gas stream.
  • the distribution element 8 branches into at least two oil elements 15, 16, 17, 18, which have a hollow interior and one or more openings 9, through which the NH 3 -containing
  • Reactant 4 is introduced as a gas phase in the exhaust stream 2.
  • the NH 3 -containing Christsmittei 4 is vaporizable within the Manteleiements, that is, the NH 3 -containing reactant 4 evaporates in the interior of the Manteleiements 5.
  • the jacket member 5 comprises a heat-transmitting member 10, so that the jacket member 5 is heated by the exhaust stream 3, in particular the heat-transmitting element 10 according to FIG. 1 or FIG. 2 may be formed as a rib 11 or as a tube 12.
  • a plurality of ribs 11 is provided, which are formed as plate-shaped elements.
  • the plates extend in the flow direction of the exhaust gas stream 2, so that the exhaust gas stream 2 passes along the plate-shaped elements.
  • the plate-shaped elements are only a preferred embodiment of a heat-transmitting element.
  • tubular elements, thickenings, disk-shaped elements, rod-like elements, schaufeiförmige elements, lattice structures, Metal foams and the like may be provided.
  • these elements can be arranged in any combination.
  • the exhaust gas flow has a higher temperature than the heat-transferring member 10, so that heat transfer from the heat-transferring member 10 to the NH? containing reactant 4 takes place.
  • the heat-transferring element 10 is formed as a tube 12, it simultaneously assumes the function of the jacket element 5. The heat transfer takes place in this case from the exhaust gas flow through the tube wall to the NH3-containing reaction center! 4, This heat transfer may be sufficient if the required temperature difference between the exhaust stream 2 and the NH 3 -containing reactant 4 is large enough, or the volume flow 2 at NH 3- containing reaction center! 4 is so small that the available heat transfer surface is sufficient in each case.
  • jacket element 5 according to FIG. 1 or FIG. 2 is preferably made of good heat-conducting material. manufactured, so that the heat transfer
  • the sheath element 5 has a thermal
  • Downstream of the distributor 8 may be shown after each of
  • Embodiments be arranged a mixer, in particular a static mixer to mix the exhaust gas stream with the NH3-containing reactant.
  • This mixer is not shown in the drawing.
  • the NH 3 -high reactant 4 can be obtained by conversion of urea.
  • This reaction could also take place inside the jacket element 5.
  • the jacket element can comprise a non-illustrated reactor element for converting urea into NH 3 ; in particular, the urea can be supplied to the reactor element in the liquid phase.
  • the supply of urea can be carried out, for example, by means of a device as shown in EP 1956208 A.
  • the Manteielement according to FIG. 1 or 2 may contain Strömungsumienkende and good heat conducting internals, which, as metal foam or
  • Ceramic foam 13 may be formed. The metal or
  • Ceramic foam 13 is preferably open-pore, thus the NH 3- containing reactant 4 can flow through the metal foam evenly.
  • the metal or ceramic foam 13 may in particular be in heat-conducting connection with the manure element, so that the heat of the exhaust gas stream can be transferred to the NH 3 -containing reactant 4 via heat conduction through the jacket element 5 as well as through the metal or ceramic foam 13.
  • the exhaust gas flow 2 has a higher temperature than the heat-transmitting element 10, so that a heat transfer from the heat-transferring
  • the heat-transferring element 10 is formed as a tube 12 with ribs 11 arranged thereon and at the same time assumes the function of the jacket element 5. The heat transfer takes place in this case from
  • Reactant 4 This heat transfer may be sufficient if the required temperature difference between the exhaust stream 2 and the NH 3 -containing reactant 4 is large enough, or the volume flow 2 of NH 3 containing reactant 4 is so small that the available heat transfer surface in each Case is sufficient.
  • a small exhaust gas can! with 1 m 2 of cross-sectional area one
  • Pressure loss in the NH 3 -ha ⁇ term reactant is significantly lower than in the previously known evaporator in the inventive evaporator.
  • pressure losses of about 1 bar / m are achieved in the inventive evaporator, while 3 bar / m are formed in the evaporator according to the prior art.
  • the erf ⁇ ndungshiele evaporator generates a pressure drop of 0.22 mbar in the exhaust stream while the previously known evaporator with 2.4 mbar causes a more than an order of magnitude higher pressure drop in the exhaust gas.
  • Embodiments thus a comparable pressure loss is generated as in the downstream of the device optionally arranged static mixer.
  • the length of the channel 3 is significantly lower than for a solution according to the prior art.
  • the pressure loss generated by the channel 3 in Abgaskana! 14 surprisingly significantly lower than in the previously known solution due to the shorter length of the device according to the invention.

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

Abstract

L'invention concerne un dispositif (1) pour nettoyer un flux de gaz d'échappement (2) contenant des NOx, qui comprend un canal (3), lequel peut être traversé par un réactif (4) contenant du NH3, le canal (3) présentant un élément d'enveloppe (5) qui entoure le canal (3) et comprend une ouverture d'entrée (6) pour l'arrivée du réactif (4) contenant du NH3 et une ouverture de sortie (7). L'élément d'enveloppe (5) peut être entouré par le flux de gaz d'échappement (2) contenant des NOx, un élément de répartition (8) destiné à la répartition du réactif (4) contenant du NH3 pouvant être raccordé à l'élément d'enveloppe (5), de telle sorte qu'au moyen de l'élément de répartition (8), le réactif (4) contenant du NH3 peut être introduit dans le flux de gaz d'échappement (2) et peut être mélangé avec le flux de gaz d'échappement (2). L'élément de répartition (8) présente une ouverture (9), par laquelle le réactif (4) contenant du NH3 peut être introduit sous forme de phase gazeuse dans le flux de gaz d'échappement (2), le réactif (4) contenant du NH3 pouvant être évaporé à l'intérieur de l'élément d'enveloppe (5). L'élément d'enveloppe (5) comprend un élément caloporteur (10), de sorte que l'élément d'enveloppe (5) peut être chauffé au moyen du flux de gaz d'échappement (2).
EP10725158A 2009-07-01 2010-06-11 DISPOSITIF POUR LE NETTOYAGE DE GAZ D'ÉCHAPPEMENT CONTENANT DES NOX& xA; Withdrawn EP2470759A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10725158A EP2470759A1 (fr) 2009-07-01 2010-06-11 DISPOSITIF POUR LE NETTOYAGE DE GAZ D'ÉCHAPPEMENT CONTENANT DES NOX& xA;

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP09164280 2009-07-01
PCT/EP2010/058265 WO2011000685A1 (fr) 2009-07-01 2010-06-11 Dispositif pour le nettoyage de gaz d'échappement contenant des nox
EP10725158A EP2470759A1 (fr) 2009-07-01 2010-06-11 DISPOSITIF POUR LE NETTOYAGE DE GAZ D'ÉCHAPPEMENT CONTENANT DES NOX& xA;

Publications (1)

Publication Number Publication Date
EP2470759A1 true EP2470759A1 (fr) 2012-07-04

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EP10725158A Withdrawn EP2470759A1 (fr) 2009-07-01 2010-06-11 DISPOSITIF POUR LE NETTOYAGE DE GAZ D'ÉCHAPPEMENT CONTENANT DES NOX& xA;

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Country Link
US (1) US20120087840A1 (fr)
EP (1) EP2470759A1 (fr)
CN (1) CN102472142B (fr)
WO (1) WO2011000685A1 (fr)

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DE102010045072A1 (de) * 2010-09-10 2012-03-15 Friedrich Boysen Gmbh & Co. Kg Abgasreinigungseinrichtung
FI20115130A0 (fi) * 2011-02-10 2011-02-10 Waertsilae Finland Oy Pakokaasusäiliö, polttomoottori ja scr-menetelmä
WO2013117230A1 (fr) * 2012-02-09 2013-08-15 Toyota Motor Europe Nv/Sa Injecteur d'agent de réduction
FR2991711B1 (fr) * 2012-06-06 2014-07-04 Faurecia Sys Echappement Dispositif de generation d'ammoniac
FR2995629B1 (fr) 2012-09-14 2014-10-17 Faurecia Sys Echappement Dispositif de stockage d'ammoniac et ligne d'echappement equipee d'un tel dispositif
CN104797529B (zh) 2012-12-21 2018-06-22 澳泽化学股份公司 氨气发生器、用于产生氨的方法及其用于还原废气中的氮氧化物的用途
US9926822B2 (en) 2013-08-16 2018-03-27 Cummins Emission Solutions, Inc. Air curtain for urea mixing chamber
ES2821729T3 (es) * 2015-12-03 2021-04-27 Anua Clean Air International Ltd Procedimiento y aparato para limpiar una corriente de aire contaminado en un reactor con material de conchas marinas
DE102016100284A1 (de) * 2016-01-11 2017-07-13 Eberspächer Exhaust Technology GmbH & Co. KG Abgasanlage für eine Brennkraftmaschine und Verfahren zum Betreiben einer Abgasanlage
CN108126730A (zh) * 2017-12-15 2018-06-08 中国第汽车股份有限公司 改善整体挤出式蜂窝催化剂导热系数的方法

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Also Published As

Publication number Publication date
CN102472142A (zh) 2012-05-23
US20120087840A1 (en) 2012-04-12
WO2011000685A1 (fr) 2011-01-06
CN102472142B (zh) 2015-04-29

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