EP2038050B1 - Statischer mischer aufweisend mindestens ein flügelpaar zur erzeugung einer wirbelströmung in einem kanal - Google Patents

Statischer mischer aufweisend mindestens ein flügelpaar zur erzeugung einer wirbelströmung in einem kanal Download PDF

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Publication number
EP2038050B1
EP2038050B1 EP07730073A EP07730073A EP2038050B1 EP 2038050 B1 EP2038050 B1 EP 2038050B1 EP 07730073 A EP07730073 A EP 07730073A EP 07730073 A EP07730073 A EP 07730073A EP 2038050 B1 EP2038050 B1 EP 2038050B1
Authority
EP
European Patent Office
Prior art keywords
mixer
accordance
vane
passage
flow
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.)
Active
Application number
EP07730073A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2038050A2 (de
Inventor
Felix Moser
Sabine Sulzer Worlitschek
Joachim Schoeck
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 PL07730073T priority Critical patent/PL2038050T3/pl
Priority to EP07730073A priority patent/EP2038050B1/de
Publication of EP2038050A2 publication Critical patent/EP2038050A2/de
Application granted granted Critical
Publication of EP2038050B1 publication Critical patent/EP2038050B1/de
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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
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
    • 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
    • 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
    • B01F25/30—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
    • 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
    • B01F25/4317—Profiled elements, e.g. profiled blades, bars, pillars, columns or chevrons
    • B01F25/43171—Profiled blades, wings, wedges, i.e. plate-like element having one side or part thicker than the other
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/02—Influencing flow of fluids in pipes or conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • 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
    • B01F25/4317—Profiled elements, e.g. profiled blades, bars, pillars, columns or chevrons
    • 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
    • B01F25/43197—Straight mixing tubes with baffles or obstructions that do not cause substantial pressure drop; Baffles therefor characterised by the mounting of the baffles or obstructions
    • B01F25/431973—Mounted on a support member extending transversally through the mixing tube

Definitions

  • the invention relates to a static mixer with at least one pair of vanes for generating a flow swirl in the direction of a channel flow according to the preamble of claim 1.
  • This pair of vanes is a vortex-inducing static mixer element.
  • the pairs of wings are arranged on a "floor” next to each other; but they can also be grid-like arranged on two or more "floors" next to and above each other.
  • a secondary fluid should be mixed into a primary fluid.
  • the primary fluid may be an exhaust gas containing nitrogen oxides, in which denitrification by means of a catalyst is to be carried out in a Denox plant, the secondary fluid being metered in as ammonia or an ammonia / air mixture as an additive.
  • a static mixer for a channel flow can be achieved with a small pressure loss mixing of the secondary fluid into the primary fluid with the required homogenization.
  • the vortex-inducing static mixer element only a homogenization in the form of a temperature and / or concentration compensation can also be carried out.
  • At least two vortex-generating, planar-like vanes are arranged in a channel through which the fluids pass, in such a way that generation of a swirl in the direction of the channel flow, the main flow direction, is forced.
  • Run-side leading edges of the wings are attached to a pipe perpendicular to the main flow direction and parallel to a height (or shorter side) of the channel.
  • This mounting tube connects a lower with an upper channel wall.
  • the additive dosage can be integrated into the tube.
  • the secondary fluid fed into the tube can be distributed through a plurality of nozzles in the primary fluid.
  • the two wings are offset from each other and V-shaped attached to the mounting tube. Starting from the front edges, the wings are bent in opposite directions, so that they have a concave surface upstream.
  • the vane cross sections along the main flow direction have variable longitudinal extent and variable orientation. Due to the special shape created in the channel flow of the swirl, which causes in the form of a primary vortex mixing over the entire channel height.
  • the wings according to the prior art would therefore have to be made of thick-walled sheet metal, ie be designed with sheet wall thicknesses of several millimeters.
  • a sheet-metal wall thickness causes numerous manufacturing problems, since a thick-walled sheet in the Required dimension and geometry barely machined, in particular can be rolled.
  • Another disadvantage is the high material consumption for the wings of thick-walled sheet to see, especially if the length of the wings is in the range of one to several meters. On the one hand, this material consumption results in high material costs. On the other hand, the high material consumption leads to high weights of the static mixer.
  • This last aspect is of particular importance for the installation of the mixer, since the mixer is installed in large flue gas ducts. These flue gas ducts are usually made of thin sheets and the walls, which are composed of these thin-walled sheets, therefore have a limited support function. For the installation of a heavy mixer, these flue gas ducts must therefore be reinforced by complex additional support structures.
  • a plurality of wing pairs induce a corresponding number of primary vortices that allow global admixture of an additive across the channel cross-section.
  • the respective direction of rotation of the primary vortex is essential.
  • Adjacent vortices, which rotate in the same direction, connect to a roller which extends over the effective ranges of these vane-inducing wing pairs. If the vortices are in opposite directions, the result is better mixing in the individual effective ranges, but at the expense of global mixing. In this case, to improve the global mixing a mixed coupling between the adjacent vortices by means of additional guide elements (see. DE-A-195 39 923 C1 ) be generated.
  • secondary vortex In addition to the primary vertebrae secondary vortex also form, namely behind the mounting tube and at the free edges of the area-like wings. Although the secondary vortices can contribute to a local mixing, but cause pressure losses and undesirable vibration effects. It would be advantageous if the occurrence of secondary vertebrae could be at least partially prevented.
  • the object of the invention is to provide a vortex inducing static mixer, which is improved in terms of pressure losses and vibration effects. This object is achieved by the mixer defined in claim 1.
  • An additional object of the invention is to provide a static mixer which can be installed in flow channels, in particular flue gas channels, with a large cross-section without the need for complicated additional stiffening on the flow channel or the support for the static mixer in the flow channel.
  • the static mixer comprises at least one pair of vanes for generating a flow swirl in the direction of a channel flow.
  • Run-side leading edges of the wings are perpendicular to the channel flow and parallel to a shorter side of the channel, hereinafter referred to as height. Downstream following, streamed surfaces are concave and bent in opposite directions.
  • Each wing is formed as an aerodynamically shaped body comprising an end wall, a convex side wall and a concave side wall.
  • the end wall has a convex shape or a shape of a leading edge.
  • the wing cross sections perpendicular to the side walls have similar shapes as cross sections of aircraft wings.
  • a mixer 1 according to the invention comprises at least one pair of blades as a mixing element 2, with which in a channel 10 in a channel flow 3, a flow swirl 300 is generated, the axis pointing in the direction of the channel flow 3.
  • a top 10a and a bottom 10b of the channel 10 define the height of the channel 10.
  • the pair of wings 2 comprises a first wing 2a and a second wing 2b.
  • the upstream edges of the wings 2a, 2b are perpendicular to the channel flow 3 and parallel to the height of the channel 10.
  • the axis of the channel 10 defines the main flow direction 30 (FIG. Fig. 3 ) of the channel flow 3, in which the swirl 300 points.
  • each wing 2a, 2b is designed as an aerodynamically designed body which comprises an end wall 20, a convex side wall 21 and the concave side wall 22.
  • the wing cross-sections transverse to the side walls 20, 21, 22 have a variable orientation and longitudinal extent. In particular, they have a shape which is similar to cross-sections of aircraft wings.
  • the orientation of the wing cross section varies between an angle ⁇ and an angle ⁇ , as in Fig. 3 is shown.
  • ⁇ is smaller than ⁇ .
  • the convex end wall 20 is in the illustrated embodiment, an elongate cylinder 20 'or a pipe 23 (FIG. Fig. 4 ).
  • Gusset 26 ( Fig. 1 ) provide improved mechanical stability of the pair of wings 2.
  • the end wall 20 has in the illustrated embodiment, a convex shape; but she can do that too be formed so that it forms a special leading edge on which dust particles can not or only to a very limited extent deposit.
  • the wings 2a, 2b of the mixer element 2 form bodies in the form of lightweight constructions; According to the invention, they are hollow bodies.
  • the side walls of the wings 2a, 2b are advantageously made of thin sheet whose thickness is for example 1 mm, but may also be smaller, for example 0.5 mm.
  • stabilizing connecting elements are arranged, for example, corrugated metal strips 24 (see Fig. 4 ) foamed bodies (not shown) or spars. In Fig. 1 Holmes are indicated as dashed lines 27.
  • the wings 2a, 2b produced as lightweight constructions can be designed in such a way that, with a wing height of one meter (or even more), they lack natural oscillations whose frequencies are within the range of 1 to 10 Hz.
  • the natural vibrations outside this range are not excited by the channel flow 3; In particular, no so-called flag oscillations are excited.
  • the "flag vibration” is a flow-induced vibration that is comparable to the movement of a fluttering in the wind flag.) Thanks to the aerodynamic shape of the wings, the channel flow 3 enters a region of the static mixer elements in the flow, in which the flow cross-sections between the wings continuously reduced. A pressure drop corresponds to an increase in the kinetic energy of the flow.
  • the flow cross-sections expand in a diffuser-like manner.
  • the pressure can increase again without substantial dissipation of the kinetic energy.
  • the reduced dissipation means that only weakly formed secondary vortexes are created, for example, which do not cause flag vibrations. Due to the lightweight constructions, the wings 2a, 2b stiffened, so that excitation of vibrations either due to changed mechanical properties either completely absent or at least shifted to higher and thus uncritical vibration frequencies out.
  • An additive metering can be carried out in a known manner by means of a metering grid, which is arranged in the channel 10 in front of the mixer elements 2. But there are great cost savings when the additive dosage are integrated into the mixer elements 2, as already in the DE-A-195 39 923 C1 is provided.
  • this known form of additive metering in which nozzles are arranged directly at the base of the vanes, it has proven to be more advantageous to provide outlet openings with respectively feed of the additives whose feed direction points in the direction of or transverse to the flow direction. Such a measure not only results in a better mixing effect, but the feed is also less sensitive to an uneven flow.
  • the openings 42 are nozzles, bores or laser-cut openings, which may be, for example, round, rectangular or slot-shaped.
  • the additive to be metered is a secondary fluid 4 ( Fig. 1 ) to be mixed in the primary fluid formed by the channel flow 3.
  • the apertures 42 each define a feed direction 40 of the secondary fluid 4, which defines an exit angle ⁇ relative to the main flow direction 30.
  • This exit angle ⁇ has a favorable value, which lies in the range between 60 and 170 °, preferably between 120 and 150 °.
  • Computational Fluid Dynamics (CFD) studies have given ⁇ an optimal value of 142.5 °.
  • the integrated additive dosage may also include apertures for the secondary fluid 4 disposed in the sidewalls 21 and 22.
  • the breakthroughs 42 of the additive dosage are arranged at intervals at levels that have been theoretically or empirically optimized with respect to model calculations or experiments. They are arranged, for example, at individual levels in pairs and mirror-symmetrically with respect to the axis of the spin 300. In general, however, all or most breakthroughs 42 are at different levels, which may have different distances.
  • the apertures 42 may be connected to a supply line for the additive, or the additive is fed directly to the hollow body of the airfoil.
  • the side walls 21, 22 of the wing pair 2 are connected by a perpendicular to the tube standing gusset plate (no graphic representation), such as one of the DE-A-195 39 923 C1 is known. If the gusset plate has a triangular shape with straight sides, edges project beyond the concave side walls 22. With such protruding edges of the gusset plate an improved mixing effect is achieved without causing an increased pressure drop.
  • the wing walls 21, 22 are at least partially made of metal, ceramic material and / or plastic.
  • a metallic mixer element 2 may be coated with ceramic material or plastic.
  • the use of the mixer according to the invention is particularly advantageous if the height (shorter side) of the channel 10 is greater than 0.5 m, preferably greater than 1 m.
  • the mixer elements 2 (pair of wings) extend with advantage over the height of the channel 10, wherein they are arranged on a floor.
  • the number of mixer elements 2 is substantially equal to the quotient of channel width to channel height. Typical values for this number are in the range from 2 to 8.
  • the pairs of wings 2 can be arranged instead of on a "floor” on two or more "floors", the "floors” are not usually separated by walls from each other.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Dispersion Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Accessories For Mixers (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
  • Percussion Or Vibration Massage (AREA)
EP07730073A 2006-06-27 2007-06-12 Statischer mischer aufweisend mindestens ein flügelpaar zur erzeugung einer wirbelströmung in einem kanal Active EP2038050B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL07730073T PL2038050T3 (pl) 2006-06-27 2007-06-12 Mieszalnik statyczny posiadający co najmniej jedną parę łopatek do wytwarzania przepływu wirowego w kanale
EP07730073A EP2038050B1 (de) 2006-06-27 2007-06-12 Statischer mischer aufweisend mindestens ein flügelpaar zur erzeugung einer wirbelströmung in einem kanal

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP06116121 2006-06-27
PCT/EP2007/055744 WO2008000616A2 (de) 2006-06-27 2007-06-12 Statischer mischer aufweisend mindestens ein flügelpaar zur erzeugung einer wirbelströmung in einem kanal
EP07730073A EP2038050B1 (de) 2006-06-27 2007-06-12 Statischer mischer aufweisend mindestens ein flügelpaar zur erzeugung einer wirbelströmung in einem kanal

Publications (2)

Publication Number Publication Date
EP2038050A2 EP2038050A2 (de) 2009-03-25
EP2038050B1 true EP2038050B1 (de) 2011-01-12

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ID=37310756

Family Applications (1)

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EP07730073A Active EP2038050B1 (de) 2006-06-27 2007-06-12 Statischer mischer aufweisend mindestens ein flügelpaar zur erzeugung einer wirbelströmung in einem kanal

Country Status (14)

Country Link
US (1) US8684593B2 (ru)
EP (1) EP2038050B1 (ru)
JP (1) JP4875155B2 (ru)
KR (1) KR101446659B1 (ru)
CN (1) CN101479025B (ru)
AT (1) ATE494947T1 (ru)
BR (1) BRPI0713057B1 (ru)
CA (1) CA2656214C (ru)
DE (1) DE502007006250D1 (ru)
DK (1) DK2038050T3 (ru)
PL (1) PL2038050T3 (ru)
RU (1) RU2438770C2 (ru)
TW (1) TWI426952B (ru)
WO (1) WO2008000616A2 (ru)

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Also Published As

Publication number Publication date
RU2009102519A (ru) 2010-08-10
EP2038050A2 (de) 2009-03-25
JP2009541045A (ja) 2009-11-26
CA2656214C (en) 2014-11-25
BRPI0713057B1 (pt) 2018-05-02
PL2038050T3 (pl) 2011-06-30
BRPI0713057A2 (pt) 2012-04-10
WO2008000616A2 (de) 2008-01-03
TW200821035A (en) 2008-05-16
CN101479025A (zh) 2009-07-08
DK2038050T3 (da) 2011-04-18
CA2656214A1 (en) 2008-01-03
KR101446659B1 (ko) 2014-10-01
DE502007006250D1 (de) 2011-02-24
RU2438770C2 (ru) 2012-01-10
CN101479025B (zh) 2012-10-24
TWI426952B (zh) 2014-02-21
JP4875155B2 (ja) 2012-02-15
US8684593B2 (en) 2014-04-01
KR20090021357A (ko) 2009-03-03
WO2008000616A3 (de) 2008-10-30
US20090103393A1 (en) 2009-04-23
ATE494947T1 (de) 2011-01-15

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