EP0956897A2 - Dispositif pour mélanger un gaz passant un conduit - Google Patents

Dispositif pour mélanger un gaz passant un conduit Download PDF

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Publication number
EP0956897A2
EP0956897A2 EP99108479A EP99108479A EP0956897A2 EP 0956897 A2 EP0956897 A2 EP 0956897A2 EP 99108479 A EP99108479 A EP 99108479A EP 99108479 A EP99108479 A EP 99108479A EP 0956897 A2 EP0956897 A2 EP 0956897A2
Authority
EP
European Patent Office
Prior art keywords
flow
built
channel
installation element
installation
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Withdrawn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
EP99108479A
Other languages
German (de)
English (en)
Other versions
EP0956897A3 (fr
Inventor
Joachim Dr. Dohmann
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.)
BBP Environment GmbH
Original Assignee
Deutsche Babcock Anlagen AG
BBP Environment 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 Deutsche Babcock Anlagen AG, BBP Environment GmbH filed Critical Deutsche Babcock Anlagen AG
Publication of EP0956897A2 publication Critical patent/EP0956897A2/fr
Publication of EP0956897A3 publication Critical patent/EP0956897A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B01F23/10—Mixing gases with gases
    • 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
    • B01F25/3131—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced in the centre of the conduit with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
    • 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
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/431—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor
    • B01F25/4315—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being deformed flat pieces of material
    • B01F25/43151—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor the baffles being deformed flat pieces of material composed of consecutive sections of deformed flat pieces of material

Definitions

  • the invention relates to a device for thorough mixing of a gas stream flowing through a channel with the features the preamble of claim 1 and a method using the device.
  • Devices for mixing a gas stream are in the Aftertreatment of flue gases required at the Burning coal, garbage, sewage sludge or others Fuels are created. These fumes contain some undesirable, but unavoidable, pollutants contained in a the flue gas cleaning system downstream of the combustion be removed. These pollutants include nitrogen oxides, by adding a reducing agent to the flue gas be reduced.
  • a well known static Gas mixer has a mixing element, which by a The main axis of the flue gas path is twisted and therefore curved Surface is formed.
  • the sequence of several Mixing elements of this type lead to good mixing.
  • This mixer is on the one hand in its complex, spatially curved structure. To the others, a single mixing element extends across the entire flue gas path.
  • a Mixing element used that the wake flow from at the Used mixer plates attached to the duct wall.
  • This Mixing elements consist of approximately trapezoidal Patches attached to the trapezoidal base on the wall are. Three edges of the surface element are free from the flue gas washed around. The elements are inclined in the main flow direction. Retaining bars are located between the throat for attachment the mixing element and the wall, i.e. in the detachment area of the Flow. These mixing elements produce two in opposite directions oriented vortex with speed components across Main flow direction. This pair of vertebrae intensifies Mixing processes in the gas phase.
  • the use of several Mixing elements are intended to ensure good mixing.
  • a disadvantage is the relatively long length of the channel wall Edge of the mixing element.
  • a generic device the mixing of several Gas flows or the interference of a liquid cooling medium in serves a gas flow are from the documents DE-C-2 911 873, DE-U-8 219 268, EP-B-0 637 726.
  • At this Device become flat built-in elements in the form symmetrical surfaces used. The edges of this Installation elements are free on all sides of those to be mixed Fluids washed around. These built-in elements are under at an acute angle to the direction of flow Flue gas flow introduced that at its front edge Detachment vortex arises, which in the publications mentioned as Leading edge vertebrae is designated. This leading edge vortex also has velocity components across Main flow direction, causing the mixing operations be intensified.
  • the built-in elements of the known Device are circular, elliptical, oval, parabolic, diamond-shaped or triangular basic shape executed. They can be profiled in cross-section or with provided with an angled edge or angled in a V-shape be.
  • a disadvantage of static mixers of this known design is the type of introduction into the flue gas path. Through the is all around free washing around the edges of the built-in element a separate supporting structure is required (DE-U-8 219 268). Form the built-in elements causes by the flue gas flow Forces are induced that are transient and in the Make the component noticeable as vibration. The structures for Attachment of these built-in elements are for inclusion mechanical stresses resulting from the flow induced Vibration result, to interpret. This results in less favorable Regularly move to heavy structures with large ones Moments of resistance. The high weight of the structures represents a serious disadvantage, since the process-related Installation position of these installation elements in reactors Reduction of nitrogen oxides is usually at high altitude, what again the static structure of the overall reactor and the Assembly adversely affected.
  • the invention is based, the installation elements to design the generic device such that you Weight and the weight of the supporting structures reduced can be.
  • the built-in elements according to the invention produce a Vortex wake with flow components across Main flow direction, which is the mixing of the gas flow intensify.
  • the edge of the installation element along straight lines forming the omega or w shape increases the mechanical stability of the built-in element, so that this can be made thinner and thus weight-saving.
  • the omega or W shape allows the installation of spans or gusset plates to further reduce weight and / or to increase the mechanical stability of the Installation element too. Since these stiffeners on the side facing away from the flow can act they do not interfere with the course of the gas flow.
  • the structure for attaching the Installation element in the channel within the central concave Curvature on the inflow side of the installation element be accommodated. The structure is different from that of State of the art outside the vortex fields, so that this not be adversely affected. The structure can therefore run easier.
  • the inventive device for mixing a Gasstromes uses sheet-like built-in elements 1, the Mode of operation and arrangement within a channel 2 later to be discribed.
  • FIGS. 1 and 2 For the geometric shape of the installation element 1 discussed: This form is derived from an imaginary, flat surface element in the shape of a trapezoid from, which is symmetrical in the case shown, but also can be asymmetrical.
  • the installation element 1 is created by single or multiple folding of the flat, imaginary Surface element.
  • the trapezoid has the sides a, b, c, d and the height h up.
  • the sides a and c are parallel to each other, the longer one Side a represents the trapezoidal base.
  • the surface element is with an arrow from the trapezoidal base a.
  • the The sweep is due to an angled saving of the Area element originated from the trapezoidal base a going out.
  • the arrows of the installation element 1 leads to one further weight saving, on the other hand it serves in Installation condition of the installation element of the optimization of the Distance between the rear edges of the installation element and the associated duct wall.
  • the sweep serves Reduction of unsteady movements in the flue gas flow.
  • the associated arrow height is denoted by + p in FIG. 1.
  • the trapezoidal base a is therefore only an imaginary line.
  • the arrow height can also take negative values and be formed by a protrusion starting from the trapezoidal base. In this case, the shape of the swept trapezoid changes into the mathematical form of a kite, but with the tip cut. Such a negative arrow height is shown in FIG. 4.
  • the arrow height to be selected depends on the height h of the imaginary trapezoid.
  • the absolute amount of the ratio between the height h of the imaginary trapezoid and the arrow p is within the limits between 0.1 and 0.75, so the relationship is: 0.1 ⁇
  • the installation element 1 is in one of a gas stream flowed through channel 2 that the short side c in the Installation position of the main flow direction points.
  • the the short side of the imaginary trapezoid thus becomes the head edge.
  • the sides of the imaginary trapezoid form the side edges of the Installation element 1, and the resulting from the arrow, in Edge pointing in the direction of flow becomes the trailing edge.
  • the axis of gravity of the built-in element 1 is opposite Main flow direction of the gas stream at an angle employed.
  • the gravity axis in relation to the main flow direction by one Angle must be twisted, which is the case with symmetrical installation elements 1 to an asymmetrical flow against the built-in element leads the gas flow.
  • the installation element 1 As shown in Fig. 3, starting from a flat Slab the installation element 1 along the lines 3 so that that in the cross section of the installation element 1, the shape of the Greek letter ⁇ or the Latin letter W arises.
  • the folded installation element 1 is in the Gas flow used that towards the inflow in the middle Area a concave curvature 4 and concave on both sides Curvature 4 two convex curvatures 5 are formed.
  • An inner surface and the convex curvatures 5 form an outer surface outer surfaces widen in the direction of flow and are wider at least at its widest than the inner ones Surfaces.
  • the two outer surfaces close an angle of about 120 °, while that formed by the inner surfaces Angle is about 90 °. That of the two outer surfaces included angle can be between 90 ° and 180 °, and that of angle included between the two inner surfaces vary between 0 ° and 120 °.
  • Installation element 1 in one of the flue gas from one Combustion process flow channel 2 is installed.
  • the direction of flow is indicated by arrow 6.
  • the one pointing in the direction of flow 5 is parallel to one of the walls of the Channel 2 aligned.
  • the rear edge can also be under one be inclined at a small angle against the wall of channel 2.
  • the built-in element 1 is fastened to a support 7 which is attached to two opposite walls of the channel 2 is supported.
  • This carrier 7 is on the flow of the flue gas Bottom of the mounting element 1 within the concave Curvature 4 arranged. Exercises when arranging at this point the carrier 7 has no adverse effect on the Flow field of the flue gases flowing at the edge.
  • the top edge and the side edges of the in the flue gas stream lying installation element 1 are on all sides of the flue gas washed around. This creates on the head edge and on the Side edges release vortex, they are downstream Spread out a circular cone and form a swirl field that due to its rotation a flow component transverse to Main flow direction generated. This cross flow component leads through the exchange of impulses connected to it Direction of flow for thorough mixing of the Flue gas flow.
  • the favorable effect of the built-in element 1 on the Mixing the flue gas stream can be advantageous Way of adding a reducing agent to the Flue gas for the purpose of reducing that in the flue gas Use existing nitrogen oxides.
  • a reducing agent Ammonia-water mixture used with the help of air in atomized form is blown into the flue gas.
  • the Blowing takes place via a with an outlet head 9 provided lance 10.
  • This lance 10 is thus in channel 2 used that the outlet head 9 in the by the Installation element 1 generated slipstream.
  • the gases within the slipstream mix with the flue gas from the Mainstream. This will make it a very even one Mixing of the reducing agent in the flue gas reached. In this way, local sub or Excess concentrations of the reducing agent in the flue gas as well local temperature differences can be avoided.
  • openings 11 or holes arranged. Flue gas passes through these openings 11 to a small extent Circumference from the inflow side to the outflow side of the Installation element 1.
  • These openings 11 can by simple cutting out of the built-in element 1 Sheets are made. More advantageous in the sense of Generating additional turbulence is the creation of Openings 11 by making slots in the sheet of the installation element 1 and by bending the Opening 11 corresponding surface element from the Sheet level. When two slots are made, one Include angles and cut at one point, can a triangle bend out of the sheet. This triangle works for the one passing through the opening 11 Flue gas partial flow as a detaching edge. This partial flow will thereby stimulating a turbulent mixture.
  • Installation element 1 is only one in channel 2 Installation element 1 shown. But it can be advantageous in a channel 2 several of these installation elements 1 to be arranged approximately in one plane (FIG. 7). Are there different arrangements possible. So the built-in elements 1 approximately in a plane that is perpendicular is oriented to the direction of flow. The installation elements 1 can also be done by lining up several elements in one Be arranged plane that is oriented in the direction of flow is. Furthermore, the built-in elements 1 can also be in one or be lined up in several levels, which are inclined to the Flow direction runs or run. This creates a staggered, formed arrangement of built-in elements 1. This arrangement in particular can help the Flow resistance or the smoke loss on the flue gas side Overcoming the flow resistance of the overall arrangement further decrease.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
EP99108479A 1998-05-11 1999-04-30 Dispositif pour mélanger un gaz passant un conduit Withdrawn EP0956897A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19820992A DE19820992C2 (de) 1998-05-11 1998-05-11 Vorrichtung zur Durchmischung eines einen Kanal durchströmenden Gasstromes und Verfahren unter Verwendung der Vorrichtung
DE19820992 1998-05-11

Publications (2)

Publication Number Publication Date
EP0956897A2 true EP0956897A2 (fr) 1999-11-17
EP0956897A3 EP0956897A3 (fr) 2000-12-06

Family

ID=7867355

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99108479A Withdrawn EP0956897A3 (fr) 1998-05-11 1999-04-30 Dispositif pour mélanger un gaz passant un conduit

Country Status (7)

Country Link
US (1) US6135629A (fr)
EP (1) EP0956897A3 (fr)
JP (1) JP2000061283A (fr)
KR (1) KR19990088142A (fr)
DE (1) DE19820992C2 (fr)
PL (1) PL333040A1 (fr)
TW (1) TW499321B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1166861A1 (fr) * 2000-06-19 2002-01-02 Balcke-Dürr Energietechnik GmbH Mélangeur pour mélanger au moins deux courants de gaz ou d'autres liquides newtoniens
FR2912462A1 (fr) * 2007-02-09 2008-08-15 Renault Sas Systeme de traitement des gaz d'echappement comprenant un injecteur d'hydrocarbures
US9345671B2 (en) 2003-04-28 2016-05-24 Daiichi Sankyo Company, Limited Adiponectin production enhancer
EP1962995B2 (fr) † 2005-12-15 2017-09-06 FISIA Babcock Environment GmbH Dispositif pour le melange d' un fluide avec une grande quantite de gaz, notamment pour introduire un reducteur dans un gaz de combustion contenant un oxyde d'azote

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DE10131803A1 (de) * 2001-06-30 2003-05-28 Bosch Gmbh Robert Mischeinrichtung für eine Abgasreinigungsanlage
ES2270103T3 (es) * 2002-06-26 2007-04-01 Axair Ag Dispositivo de humidificacion.
DE10330023A1 (de) * 2002-07-20 2004-02-05 Alstom (Switzerland) Ltd. Wirbelgenerator mit kontrollierter Nachlaufströmung
CN100378408C (zh) * 2002-12-03 2008-04-02 Lg电子株式会社 流动扩散机构
CN101033765B (zh) * 2002-12-03 2013-08-28 Lg电子株式会社 流动扩散机构
DE502004006983D1 (de) * 2003-08-26 2008-06-12 Sulzer Chemtech Ag Statischer Mischer mit polymorpher Struktur
PL1568410T3 (pl) * 2004-02-27 2010-09-30 Haldor Topsoe As Urządzenie do mieszania strumieni płynu
US7448794B2 (en) * 2004-02-27 2008-11-11 Haldor Topsoe A/S Method for mixing fluid streams
US7383850B2 (en) * 2005-01-18 2008-06-10 Peerless Mfg. Co. Reagent injection grid
US7628528B2 (en) * 2005-10-26 2009-12-08 PRS Biotech, Inc. Pneumatic bioreactor
US8790913B2 (en) 2005-10-26 2014-07-29 Pbs Biotech, Inc. Methods of using pneumatic bioreactors
US20080261299A1 (en) * 2007-04-23 2008-10-23 Zeikus J Gregory Pneumatic Bioreactor
DE102006004069A1 (de) * 2006-01-28 2007-09-06 Fisia Babcock Environment Gmbh Verfahren und Vorrichtung zum Vermischen eines Fluids mit einem großen Gasmengenstrom
TWI426952B (zh) * 2006-06-27 2014-02-21 Sulzer Chemtech Ag 具有在通路流動方向上產生流動漩渦之葉片對的靜態混合器
US7713730B2 (en) * 2007-04-24 2010-05-11 Pbs Biotech, Inc. Pneumatic bioreactor
US8083156B2 (en) * 2007-05-18 2011-12-27 Urs Corporation Dispersion lance and shield for dispersing a treating agent into a fluid stream
US8011601B2 (en) * 2007-05-18 2011-09-06 Urs Corporation Dispersion lance for dispersing a treating agent into a fluid stream
EP2279240A2 (fr) * 2008-04-25 2011-02-02 PBS Biotech, Inc Appareil de bioréacteur
US8317390B2 (en) * 2010-02-03 2012-11-27 Babcock & Wilcox Power Generation Group, Inc. Stepped down gas mixing device
US8881500B2 (en) * 2010-08-31 2014-11-11 General Electric Company Duplex tab obstacles for enhancement of deflagration-to-detonation transition
FR2976984A1 (fr) * 2011-06-21 2012-12-28 Peugeot Citroen Automobiles Sa Conduit a generateur(s) de vortex pour limiter le bruit
US9387448B2 (en) * 2012-11-14 2016-07-12 Innova Global Ltd. Fluid flow mixer
US10245548B2 (en) * 2013-02-20 2019-04-02 United Conveyor Corporation Injection lance assembly
US9539535B2 (en) * 2013-02-20 2017-01-10 United Conveyor Corporation Injection lance assembly
US8801841B1 (en) * 2013-02-20 2014-08-12 United Conveyor Corporation Injection lance assembly
US20170173516A1 (en) * 2013-02-20 2017-06-22 United Conveyor Corporation Injection Lance Assembly
DE102018005192B3 (de) 2018-07-02 2019-12-05 Truma Gerätetechnik GmbH & Co. KG Brennervorrichtung
JP7261019B2 (ja) * 2019-01-21 2023-04-19 三菱重工業株式会社 脱硝装置
CN110355011A (zh) * 2019-07-08 2019-10-22 北京清新环境技术股份有限公司 一种污染物固体脱除剂喷射装置

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US4164375A (en) * 1976-05-21 1979-08-14 E. T. Oakes Limited In-line mixer
EP0063729A2 (fr) * 1981-04-25 1982-11-03 Gerhart Prof. Dr. Eigenberger Dispositif pour l'inversion et le mélange de matières en écoulement
US4812049A (en) * 1984-09-11 1989-03-14 Mccall Floyd Fluid dispersing means
WO1989000076A1 (fr) * 1987-06-29 1989-01-12 Moore Barrett And Redwood Limited Melangeur statique pour fluides
US5330267A (en) * 1991-12-10 1994-07-19 Gebrueder Sulzer Aktiengesellschaft Stationary fluid mixer with fluid guide surfaces
US5513982A (en) * 1993-04-08 1996-05-07 Abb Management Ag Combustion chamber
EP0638732A1 (fr) * 1993-08-03 1995-02-15 BDAG Balcke-Dürr Aktiengesellschaft Diffuseur
DE4341450A1 (de) * 1993-12-06 1995-06-08 Bmw Rolls Royce Gmbh Strömungsleitkörper für eine Gasturbinen-Brennkammer
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1166861A1 (fr) * 2000-06-19 2002-01-02 Balcke-Dürr Energietechnik GmbH Mélangeur pour mélanger au moins deux courants de gaz ou d'autres liquides newtoniens
US6779786B2 (en) 2000-06-19 2004-08-24 Balcke-Durr Gmbh Mixer for mixing at least two flows of gas or other newtonian liquids
US9345671B2 (en) 2003-04-28 2016-05-24 Daiichi Sankyo Company, Limited Adiponectin production enhancer
EP1962995B2 (fr) † 2005-12-15 2017-09-06 FISIA Babcock Environment GmbH Dispositif pour le melange d' un fluide avec une grande quantite de gaz, notamment pour introduire un reducteur dans un gaz de combustion contenant un oxyde d'azote
FR2912462A1 (fr) * 2007-02-09 2008-08-15 Renault Sas Systeme de traitement des gaz d'echappement comprenant un injecteur d'hydrocarbures

Also Published As

Publication number Publication date
EP0956897A3 (fr) 2000-12-06
DE19820992C2 (de) 2003-01-09
KR19990088142A (ko) 1999-12-27
US6135629A (en) 2000-10-24
DE19820992A1 (de) 1999-11-18
JP2000061283A (ja) 2000-02-29
TW499321B (en) 2002-08-21
PL333040A1 (en) 1999-11-22

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