WO2006056499A1 - Dispositif de traitement de gaz - Google Patents

Dispositif de traitement de gaz Download PDF

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Publication number
WO2006056499A1
WO2006056499A1 PCT/EP2005/054623 EP2005054623W WO2006056499A1 WO 2006056499 A1 WO2006056499 A1 WO 2006056499A1 EP 2005054623 W EP2005054623 W EP 2005054623W WO 2006056499 A1 WO2006056499 A1 WO 2006056499A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
exhaust gas
main flow
flow direction
metering tube
Prior art date
Application number
PCT/EP2005/054623
Other languages
German (de)
English (en)
Inventor
Johannes Schaller
Bernhard Hager
Ulrich Meingast
Johannes Dehn
Torsten Eggert
Original Assignee
Robert Bosch Gmbh
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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2006056499A1 publication Critical patent/WO2006056499A1/fr

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
    • F01N3/18—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
    • 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
    • F01N2610/08—Adding substances to exhaust gases with prior mixing of the substances with a gas, e.g. air
    • 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 acting in one
  • SCR selective catalytic reduction
  • the metered addition of the urea-water solution is done, for example, with air support by a so-called mixture delivery device, which projects into the exhaust gas stream.
  • a mixture delivery device is already known in which a reducing agent is introduced into an exhaust system of an internal combustion engine via a supply pipe.
  • a urea-water solution is blown into the exhaust gas upstream of a catalyst, either in the main flow direction of the exhaust gas or transversely to Main flow direction of the exhaust gas.
  • the use of a throttle in the region of a feed pipe is known. Especially at high flow velocities of the exhaust gas radially outgoing jets of urea-water solution are so much deflected from the exhaust stream that no urea-water solution gets more into edge regions of the exhaust pipe cross-section.
  • the catalyst can no longer be uniformly charged with the reaction gas mixed with the exhaust gas, so that the conversion rate of the SCR system is reduced.
  • Such an exhaust gas mixer can be arranged both before and behind the reagent metering point.
  • Such a plate or such a mixer fills the entire exhaust pipe cross-section, with the result that the exhaust gas back pressure increases depending on the engine operating point and thus the fuel consumption of the exhaust gas producing
  • features of the independent claim have the advantage of an improved uniform distribution of the reagent, in particular a urea-water solution, over the entire cross section of the pipe or exhaust pipe. It is ensured by simple means a uniform distribution, which in the case of use of a urea-water solution at a
  • Exhaust aftertreatment arrangement based on the selective catalytic reduction ensures a high conversion rate and thus efficiency in the reduction of nitrogen oxides contained in the exhaust gas in particular of diesel internal combustion engines.
  • Reactants on the one hand an orientation when leaving the introduction means, which allows a propagation over the entire exhaust pipe cross-section, and on the other hand, due to a prolonged path to a subsequently arranged catalyst sufficient time to mix with the exhaust gas, and also sufficient time to react chemically if necessary (such for example, in the case of a urea-water
  • FIG. 1 shows a mixture delivery device
  • Figure 2a shows a device for acting on a gas with reagent
  • Figure 2b shows a detail view
  • Figure 3 shows a further gas-charging device.
  • Figure 1 shows an arranged in an exhaust pipe, known from the prior art
  • Supply pipe 1 Here, the wall of an exhaust pipe section 10 is shown in which exhaust gases are guided by an internal combustion engine to a reduction catalyst. The main flow direction of the exhaust gases is indicated by the arrows p.
  • the supply pipe 1 opens into the exhaust pipe section 10.
  • the supply line 1 has within - A -
  • the supply pipe has at its downstream end a plurality of openings 2 formed around the circumference of the wall of the pipe section 1b. In front of these openings 2, that is between the openings 2 and the bending region Ic, a throttle 3 is arranged.
  • the supply pipe 1 is by means of a screw 11 on the wall of the
  • Reductant from a reducing agent storage can be introduced into the exhaust pipe section via the supply pipe.
  • Suitable reducing agents are, in addition to hydrocarbons, for example diesel fuels or the like, in particular urea-water solutions which can be introduced, for example, via an injection nozzle or other metering devices which provide, for example, mixing of the reducing agent with compressed air.
  • the reducing agent passes through the openings 2 of the feed tube 1 radially outward into the exhaust pipe over.
  • FIG. 2 a illustrates a metering tube 31 protruding into an exhaust pipe 37.
  • the metering pipe is made of steel with an outer diameter of approximately 4 millimeters and an inner diameter of 2 millimeters. It has a first, substantially perpendicular to the axis of symmetry 38 of the exhaust pipe section 31a, whose attachment to the exhaust pipe 37 is not shown in detail in the drawing.
  • This first region 31a merges via a bending region 31c into a region 31b arranged substantially parallel to the main flow direction p of the exhaust gas, the main flow direction p of the exhaust gas being determined by the geometry of the exhaust pipe and thus by the axis of symmetry 38 of the exhaust pipe.
  • Schematically illustrated is also an operation of the
  • Loading device forming spray cone 35 of the reaction medium, which can emerge from arranged in the region 31b openings from the metering tube.
  • Figure 2b shows enlarged the downstream end of the region 31b in cross-sectional side view, in which these openings 50 are located. They are as Holes formed in the Dosierrohrwandung 52, wherein the bore walls 55 form a bore angle ß to the main flow direction p, which is greater than 90 degrees and preferably about 110 to 130 degrees, in particular 120 degrees. Downstream of the bores 50, the metering tube is closed by means of a closure region 53.
  • the reagent must leave the metering tube via the laterally arranged openings or bores and enter the exhaust tract.
  • the openings are designed or oriented (bore angle ß), that a spray cone 35 can form, the main propagation direction an angle ⁇ to
  • Main flow direction p of the exhaust gas is greater than 90 degrees, so that the velocity vector of the reaction agent has a non-zero component, which is directed opposite to the main flow direction p of the exhaust gas. Due to the obliquely drilled holes on the metering tube is thus achieved that the reagent, in particular the urea-water solution, does not exit radially to the exhaust gas flow, but against the flow with a jet exit angle ⁇ , which is greater than 90 degrees.
  • the jet outlet angle ⁇ differs depending on the flow velocity of the exhaust gas more or less strongly from the bore angle ß, but in any case greater than 90 degrees. For most operating conditions, this is particularly ensured as long as the bore angle is in a range between 110 and 130 degrees, preferably about 120 degrees. Then, for most operating conditions of the internal combustion engine sufficient mixing over the entire exhaust pipe cross-section ensured by the reagent radially can occupy a wide space until the velocity component of the reaction medium parallel to the exhaust pipe reverses its sign and the
  • Reactant is entrained by the exhaust gas in the direction of the subsequently arranged reduction catalyst.
  • the mixing takes place better than with radial application of the reagent, because a more intensive mixing with the exhaust gas is made possible on the one hand by an extended flow path to the reduction catalyst and on the other hand by changing Strömungsver conceptiontisse.
  • Flow conditions are more favorable in terms of mixing at oblique injection, because the relative velocity between the reactant and the exhaust gas and thus the turbulence is greater.
  • the extended flow path to the catalyst not only requires a greater residence time of the urea-water solution in the exhaust gas, so that better mixing can take place, but there is also more time available for the conversion of the urea-water solution into ammonia.
  • FIG. 3 shows an alternative embodiment of a gas-applying device, in which, in addition to those explained in conjunction with FIGS. 2a and 2b
  • a baffle plate 40 is provided. It is attached to the end region 53 at the downstream end of the region 31b of the metering tube 31, in particular welded to the latter, and projects radially beyond the metering tube.
  • the baffle increases the exhaust back pressure due to the small diameter in the
  • the baffle plate can also replace the termination region shown in FIG. 2b, ie, in addition to the function as a baffle device, it is also the task to close the dosing tube at the downstream end of the region 31b.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

La présente invention concerne un dispositif pour traiter un gaz qui parcourt un tube à gaz, en particulier des gaz d'échappement, avec un agent réactionnel, le dispositif comprenant un élément qui présente au moins une ouverture (50) et sert à introduire l'agent réactionnel dans le tube à gaz (37), l'ouverture/les ouvertures étant conçue(s) de sorte que l'agent réactionnel peut quitter l'élément d'introduction avec une composante de vitesse qui a une direction opposée à la direction de circulation principale (p) du gaz, fixée par la géométrie du tube à gaz. Le dispositif garantit une répartition homogène de l'agent réactionnel sur la totalité de la section du tube.
PCT/EP2005/054623 2004-11-25 2005-09-16 Dispositif de traitement de gaz WO2006056499A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004056896A DE102004056896A1 (de) 2004-11-25 2004-11-25 Gasbeaufschlagungsvorrichtung
DE102004056896.0 2004-11-25

Publications (1)

Publication Number Publication Date
WO2006056499A1 true WO2006056499A1 (fr) 2006-06-01

Family

ID=35241012

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/054623 WO2006056499A1 (fr) 2004-11-25 2005-09-16 Dispositif de traitement de gaz

Country Status (2)

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DE (1) DE102004056896A1 (fr)
WO (1) WO2006056499A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8313717B2 (en) 2005-05-20 2012-11-20 Grundfos Nonox A/S Atomization of fluids by mutual impingement of fluid streams
CN115111444A (zh) * 2021-03-19 2022-09-27 中国石油化工股份有限公司 一种衬塑管道支管连接结构

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008058548A1 (fr) * 2006-11-16 2008-05-22 Grundfos Nonox A/S Tuyère et procédé pour l'atomisation de fluides
FR2935756B1 (fr) * 2008-09-08 2010-09-10 Renault Sas Buse d'injection de vapeur de carburant equipee d'un deflecteur

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4109305A1 (de) * 1991-03-21 1992-09-24 Siemens Ag Einrichtung zum einbringen eines reaktionsmittels in einen gasstrom
EP0586912A2 (fr) * 1992-09-08 1994-03-16 MAN Nutzfahrzeuge Aktiengesellschaft Buse de pulvérisation
DE19726392A1 (de) 1997-06-21 1998-12-24 Bosch Gmbh Robert Gemischabgabevorrichtung
US5992141A (en) * 1996-04-02 1999-11-30 Kleen Air Systems, Inc. Ammonia injection in NOx control
DE10035678A1 (de) * 1999-08-16 2001-03-01 Ford Global Tech Inc On-Board-System für die Zufuhr von Reduktionsmitteln
DE19946901A1 (de) 1999-09-30 2001-04-05 Bosch Gmbh Robert Vorrichtung zur Beaufschlagung eines strömenden Gases mit einem Reaktionsmittel
US6361754B1 (en) * 1997-03-27 2002-03-26 Clean Diesel Technologies, Inc. Reducing no emissions from an engine by on-demand generation of ammonia for selective catalytic reduction
DE10060808A1 (de) 2000-12-07 2002-07-04 Bosch Gmbh Robert Abgasreinigungsanlage
US20030070424A1 (en) * 2001-10-17 2003-04-17 Verdegan Barry M. Impactor for selective catalytic reduction system

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4109305A1 (de) * 1991-03-21 1992-09-24 Siemens Ag Einrichtung zum einbringen eines reaktionsmittels in einen gasstrom
EP0586912A2 (fr) * 1992-09-08 1994-03-16 MAN Nutzfahrzeuge Aktiengesellschaft Buse de pulvérisation
US5992141A (en) * 1996-04-02 1999-11-30 Kleen Air Systems, Inc. Ammonia injection in NOx control
US6361754B1 (en) * 1997-03-27 2002-03-26 Clean Diesel Technologies, Inc. Reducing no emissions from an engine by on-demand generation of ammonia for selective catalytic reduction
DE19726392A1 (de) 1997-06-21 1998-12-24 Bosch Gmbh Robert Gemischabgabevorrichtung
DE10035678A1 (de) * 1999-08-16 2001-03-01 Ford Global Tech Inc On-Board-System für die Zufuhr von Reduktionsmitteln
DE19946901A1 (de) 1999-09-30 2001-04-05 Bosch Gmbh Robert Vorrichtung zur Beaufschlagung eines strömenden Gases mit einem Reaktionsmittel
WO2001023074A1 (fr) * 1999-09-30 2001-04-05 Robert Bosch Gmbh Dispositif pour solliciter des gaz en ecoulement avec un agent reactif
DE10060808A1 (de) 2000-12-07 2002-07-04 Bosch Gmbh Robert Abgasreinigungsanlage
US20030070424A1 (en) * 2001-10-17 2003-04-17 Verdegan Barry M. Impactor for selective catalytic reduction system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8313717B2 (en) 2005-05-20 2012-11-20 Grundfos Nonox A/S Atomization of fluids by mutual impingement of fluid streams
CN115111444A (zh) * 2021-03-19 2022-09-27 中国石油化工股份有限公司 一种衬塑管道支管连接结构

Also Published As

Publication number Publication date
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