EP1432502B1 - Dispositif de floculation et procede de conditionnement de suspensions colloidales - Google Patents

Dispositif de floculation et procede de conditionnement de suspensions colloidales Download PDF

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Publication number
EP1432502B1
EP1432502B1 EP02779131A EP02779131A EP1432502B1 EP 1432502 B1 EP1432502 B1 EP 1432502B1 EP 02779131 A EP02779131 A EP 02779131A EP 02779131 A EP02779131 A EP 02779131A EP 1432502 B1 EP1432502 B1 EP 1432502B1
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EP
European Patent Office
Prior art keywords
suspension
inner cone
cone
outer shell
flocculation
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.)
Expired - Lifetime
Application number
EP02779131A
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German (de)
English (en)
Other versions
EP1432502A1 (fr
Inventor
Christian Schröder
Michael Sievers
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.)
Clausthaler Umwelttechnik Institut GmbH CUTEC
Original Assignee
Clausthaler Umwelttechnik Institut GmbH CUTEC
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Publication date
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Publication of EP1432502A1 publication Critical patent/EP1432502A1/fr
Application granted granted Critical
Publication of EP1432502B1 publication Critical patent/EP1432502B1/fr
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Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D3/00—Differential sedimentation
    • B03D3/06—Flocculation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
    • B01F27/272—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed axially between the surfaces of the rotor and the stator, e.g. the stator rotor system formed by conical or cylindrical surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
    • B01F27/272—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed axially between the surfaces of the rotor and the stator, e.g. the stator rotor system formed by conical or cylindrical surfaces
    • B01F27/2723—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed axially between the surfaces of the rotor and the stator, e.g. the stator rotor system formed by conical or cylindrical surfaces the surfaces having a conical shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
    • B01F27/272—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed axially between the surfaces of the rotor and the stator, e.g. the stator rotor system formed by conical or cylindrical surfaces
    • B01F27/2724—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed axially between the surfaces of the rotor and the stator, e.g. the stator rotor system formed by conical or cylindrical surfaces the relative position of the stator and the rotor, gap in between or gap with the walls being adjustable

Definitions

  • the invention relates to a flocculation device for the conditioning of colloidal Suspensions with a flocculating apparatus containing a suspension inlet, a Suspension outlet and has an inner cone that is centric in a cone-shaped Outside housing is mounted, wherein the inner cone and / or the outer housing rotatable relative to each other and between the inner cone and the outer housing a gap to flow through with suspensions.
  • the inner cone and / or the outer housing is mounted axially displaceable and an actuator is to controlled axial displacement of the inner cone and / or outer housing in Operative connection with the inner cone and / or outer casing.
  • the suspension is conventionally with a flocculant and / or flocculants added and in a Flocculant mechanically processed.
  • the flocculation itself is in a rapid mixer unit carried out so that the flakes arise.
  • the shape of the Flakes take place in a flake apparatus, whereby by shearing forces and Flake erosion the resulting flakes are pelleted and rounded so that the desired property of the flakes, z.
  • B. increase the Dewatering ability or thickening can improve again. Indeed The shearing forces must not be too great, because then the flocs are destroyed again and the specific flake properties can worsen.
  • the admixture of flocculants and / or flocculation aids takes place conventionally with stirred tanks or tubular reactors with Plug flow, such as injection mixers, inline turbo mixers and pumps.
  • DD 289 754 A5 is a conical stirrer with axially displaceable arranged discloses a hollow cone-shaped baffle, which is preceded by a static mixer.
  • U.S. Patent 3,834,541 discloses a device for separating solids Liquids in a suspension with a stirrer and power distribution chokes disclosed. Flocculant is added to the suspension stream via a pump. which is then passed into the flocculation apparatus.
  • GB 1 520 490 A describes a mixer for continuous mixing of Solids with solids, fluid mixtures and / or with gases.
  • US Patent 5,902,042 is a mixer in the form of a bevel stirrer with axial slidable cone described in which the suspension with a pump off a container is pumped into the conical stirrer.
  • the cone stirrer has an axial sliding cone and three inlet openings for different liquids on the head side. The liquids are mixed in the conical stirrer, the optimal operating range a laminar or laminar-cellular Flow characteristic requires.
  • the object of the invention is therefore to provide a flocculation apparatus, the can be variably adapted to the ambient conditions.
  • the problem is with the generic flocculation apparatus in the form of a Kegelrhakers solved in that immediately before the suspension inlet Mixer is arranged to produce a highly turbulent suspension flow.
  • the mixer is preferably in a device with the flocculation apparatus integrated.
  • reaction volume in the flocculation apparatus is variable and can be connected to the Environmental conditions are adjusted. Due to the axial displacement of the Inner cone and / or outer casing may be the gap width of the flow space be easily adjusted between inner cone and outer housing. This can both the residence time kept constant at different flow rates be adapted as well as the flow regime to changing mass flow become.
  • the suspension inlet is preferably in the region of the cone base of réellekegels and outer housing and the suspension outlet in the area of Cone tip of the inner cone and outer casing.
  • the runs Suspension stream preferably from the cone base to the cone apex. It has found that in such a flow direction flocculation results reproducible and optimal.
  • the surface of the inner cone and / or the inner surface of the outer housing should be profiled for example by milled longitudinal grooves. This will be the Flow implemented faster.
  • the axis of rotation of the inner cone is preferably approximately perpendicular, wherein the suspension inlet is located above the suspension outlet. In this way, a natural suspension flow from top to bottom enforced.
  • the angle of inclination of the inner cone should be relatively low and should be about 2 to 30 degrees.
  • conventional conical stirrer have a tilt angle of 35 degrees and Cylinder stirrer at an angle of 0 degrees. It was recognized that with a low tilt angle optimal reproducible and controllable Flocculation results can be achieved.
  • the speed of the inner cone and / or outer housing in Be regulated depending on a flake size distribution.
  • FIG. 1 shows the flocculation apparatus 1 according to the invention in one Detect section view.
  • the flocculation apparatus 1 consists essentially of a conical outer housing 2 and an inner cone 3, the centric in the outer housing 2 is arranged.
  • the inner cone 3 is rotatable on one mounted driven shaft 4.
  • a suspension stream is passed through a suspension inlet 5 in the region of Conical base of the inner cone 3 introduced into the flocculation apparatus 1.
  • the Suspension then flows together with the flocculant and / or Flocculation aids the gap between the inner cone 3 and the Outer housing 2 in the axial direction from the cone base to the apex and flows through a suspension outlet 6 in the region of the cone tip.
  • the inclination angle of the inner cone 3 and according to the inclination angle of the outer housing 2 is relatively small and is in the range of about 2 to 30 Degree. Since the radii of the inner cone 3 for the flows through the suspensions change during the flow, the resulting centrifugal forces are on Reason for the changing peripheral speed along the driven Wave 4 not constant. In contrast to Zylinderragitern are the Flow conditions not over the length of the circular or conical gap uniformly.
  • the outer housing 2 is considerably longer than the inner cone 3, so that the Inner cone 3 is axially displaceable in a wide range.
  • the Flocculator 1 but also be constructed so that the outer housing. 2 axially relative to the inner cone 3 can be moved. It is also conceivable that the outer housing 2 is rotatable.
  • the axial displacement of the inner cone 3 relative to the outer housing 2 can, for example, with a Spindelhubantrieb be realized as an actuator, which together with the shaft 4 acts.
  • the motor shaft of a drive motor not shown, is fixed to a Guiding sleeve connected to a keyway in operative connection with the shaft 4, so that the shaft 4 is axially opposite the motor shaft can be moved.
  • the shaft 4 is preferably in one Angular contact ball bearings 7 mounted, wherein the bearing housing preferably square is to guide this in the groove of a guide rail. This is ensures that after coupling by the angular contact ball bearing 7 no Rotation occurs more, which could act on the Spindelhubantrieb.
  • FIG. 2 shows a rapid mixer 8 with a suspension inlet 9 and a suspension outlet 10.
  • the suspension outlet 10 is immediately before the suspension inlet 5 of the flocculation apparatus 1 connected.
  • the rapid mixer 8 has a flowed through from the outside to the inside main rotor 11, with salaried, blade-shaped blades which is the suspension entrain in the conveying direction.
  • the flocculant and / or flocculant is distributed over four circumferentially spaced nozzle 12 the rapid mixer. 8 fed.
  • the medium After mixing in the main rotor 11, the medium enters an intermediate stator 13, the jacket of which reduces Wear is extended beyond the area of the main rotor 11.
  • auxiliary rotor 14th In the flow direction behind the stator 13 is an auxiliary rotor 14th intended. This arrangement of series-connected main rotor 11, Stator 13 and auxiliary rotor 14 ensures a homogeneous mixing of the Medium within a certain residence time.
  • the rotor speed should be be infinitely adjustable up to about 2800 N / min.
  • the flocculation is discretized with the flocculation apparatus.
  • the speed and the Reaction volume of the apparatus changeable. This allows the flakes in be subjected to a wide range of adapted shear force regime.
  • the setting of the rapid mixer 8 and the flocculation apparatus 1 takes place thus depending on the volume flow and in particular the Flake size and the flake size distribution.
  • the flake size and the Flock size distribution has namely z. B. a decisive influence on the Drainage and thickening ability of suspensions such.
  • Small structures, such as unflocked Primary particles, as well as smallest fractals in the flocculant suspension reduce z. B. the drainage result or the sedimentation behavior. Likewise work Structure-unstable flakes are negative.
  • the rapid mixer 8 is now controlled so that the flocculant and / or flocculants are homogeneous and complete with the suspension is mixed. It requires so much energy in the suspension flocculant and / or flocculant mixture flow to each suspension particle has the opportunity to deal with flocculants and / or flocculants connect. On the other hand, only so much energy should be used that the flakes do not return during or immediately after their formation be destroyed. For this purpose, the speed is in accordance with known and scientifically diversified manner.
  • the rotational speed and the gap width between Inner cone 3 and outer housing 2 varies.
  • the gap width change is both a change in volume and thus a change in the axial characteristics such as residence time, axial velocity, axial Reynolds number and axial Camp number, as well as a change in the radii ratios and thus a change the Taylor and rotational camp number causes. So that can Flow conditions can be set variably in a wide range.
  • the conditioning is in a closed Self-adaptive control system possible.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Polarising Elements (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (8)

  1. Dispositif de floculation pour conditionner des suspensions colloïdales avec un appareil de floculation (1) qui comprend une entrée (5) de suspension, une sortie (6) de suspension et un cône intérieur (3) disposé centralement à l'intérieur d'un boítier extérieur (2) conique, dans lequel le cône intérieur (3) et/ou le boítier extérieur (2) sont montés en rotation l'un par rapport à l'autre et il est prévu, entre le cône intérieur (3) et le boítier extérieur (2), un espace intercalaire pour la circulation des suspensions, dans lequel le cône intérieur (3) et/ou le boítier extérieur (2) sont montés pour pouvoir coulisser axialement et un actionneur pour commander le coulissement axial du cône intérieur (3) et/ou du boítier extérieur (2), qui est en relation fonctionnelle avec le cône intérieur (3) et/ou le boítier extérieur (2), caractérisé en ce qu'un mélangeur (8) est disposé devant l'entrée de suspension (5) pour obtenir une circulation hautement turbulente de la suspension, de telle sorte qu'une sortie de suspension (10) du mélangeur (8) débouche dans l'entrée de suspension (5) de l'appareil de floculation (1).
  2. Dispositif selon la revendication 1, caractérisé en ce que l'entrée de suspension (5) est disposée dans la zone de la base du cône intérieur (3) et du boítier extérieur (2) et la sortie de suspension (6) est disposée dans la zone de la pointe conique du cône intérieur (3) et du boítier extérieur (2) et en ce que le courant de la suspension circule de la base du cône vers la pointe conique.
  3. Dispositif de floculation selon la revendication 1 ou 2, caractérisé en ce que la surface supérieure du cône intérieur (3) et/ou la surface intérieure du boítier extérieur (2) est profilée.
  4. Dispositif de floculation selon la revendication 3, caractérisé en ce que le profil est formé de rainures longitudinales.
  5. Dispositif de floculation selon l'une des revendications précédentes, caractérisé en ce que l'axe de rotation du cône intérieur (3) est vertical et l'entrée de suspension (5) est située au-dessus de la sortie de suspension (6).
  6. Dispositif de floculation selon l'une des revendications précédentes, caractérisé en ce que l'angle d'inclinaison du cône intérieur (3) est compris entre 2 et 30 °.
  7. Procédé pour le conditionnement de suspensions avec un dispositif de floculation selon l'une des revendications précédentes, caractérisé par
    une saisie continuelle de la répartition de la taille des flocons dans un courant de suspension entrant dans le dispositif de floculation,
    une obtention d'un courant de suspension hautement turbulent avant l'entrée dans l'appareil de floculation (1) en réalisant un mélange intensif,
    un coulissement axial du cône intérieur (3) et/ou du boítier extérieur (2) en relation avec la répartition de la taille des flocons et du volume du courant de suspension.
  8. Procédé selon la revendication 7, caractérisé par la régulation de la vitesse de rotation du cône intérieur (3) et/ou du boítier extérieur (2) en relation avec la répartition de la taille des flocons.
EP02779131A 2001-10-02 2002-09-26 Dispositif de floculation et procede de conditionnement de suspensions colloidales Expired - Lifetime EP1432502B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10148760A DE10148760A1 (de) 2001-10-02 2001-10-02 Flockungsapparat und Verfahren zur Konditionierung von kolloidalen Suspensionen
DE10148760 2001-10-02
PCT/DE2002/003654 WO2003031040A1 (fr) 2001-10-02 2002-09-26 Dispositif de floculation et procede de conditionnement de suspensions colloidales

Publications (2)

Publication Number Publication Date
EP1432502A1 EP1432502A1 (fr) 2004-06-30
EP1432502B1 true EP1432502B1 (fr) 2005-07-13

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Application Number Title Priority Date Filing Date
EP02779131A Expired - Lifetime EP1432502B1 (fr) 2001-10-02 2002-09-26 Dispositif de floculation et procede de conditionnement de suspensions colloidales

Country Status (7)

Country Link
US (1) US7135112B2 (fr)
EP (1) EP1432502B1 (fr)
JP (1) JP4386726B2 (fr)
AT (1) ATE299394T1 (fr)
DE (2) DE10148760A1 (fr)
DK (1) DK1432502T3 (fr)
WO (1) WO2003031040A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006016067B3 (de) * 2006-04-04 2008-01-03 Clausthaler Umwelttechnikinstitut Gmbh, (Cutec-Institut) Flockenformeinrichtung
DE102018116196A1 (de) 2018-07-04 2020-01-09 Bma Braunschweigische Maschinenbauanstalt Ag Verfahren und Anordnung zur Fest-Flüssig-Trennung von Suspensionen, insbesondere von Klärschlamm unter Zugabe von Flockungsmitteln

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH702186A2 (de) 2009-11-03 2011-05-13 Sanoxys Ag Vorrichtung zum Entwässern von Erdmaterialien.
US20110240129A1 (en) * 2010-04-01 2011-10-06 Flsmidth A/S Thickener floccuant control by in-situ aggregate size analysis
SE2150525A1 (en) * 2021-04-26 2022-10-27 Valmet Oy Mixing assembly and method for controlling mixing of green liquor and a flocculation agent

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DE289754C (fr) 1900-01-01
US2793847A (en) * 1955-12-29 1957-05-28 Marie J Steele Industrial gas purifier
US2969960A (en) * 1957-06-05 1961-01-31 Mobay Chemical Corp Mixing apparatus
US3420506A (en) * 1967-04-03 1969-01-07 Mobay Chemical Corp Mixing apparatus
CA950448A (en) * 1970-04-03 1974-07-02 Agfa-Gevaert N.V. Turbulent nucleate-grained silver-halide-reactants mixing method
AR193528A1 (es) * 1971-06-22 1973-04-30 Tate & Lyle Ltd Or acuoso
CS171494B1 (fr) * 1974-04-29 1976-10-29
DE2458862A1 (de) 1974-12-12 1976-06-16 Wacker Chemie Gmbh Verwendung eines zentrischen rotationsmischers zum kontinuierlichen mischen von feststoffen mit feststoffen und/oder fliessfaehigen massen und/oder gasen
US4295973A (en) * 1979-03-16 1981-10-20 Fram Industrial Filter Corp. Process for separating solids from suspensions of influent
US4414184A (en) * 1981-02-23 1983-11-08 Union Carbide Corporation Apparatus for mixing chemical components
US5088831A (en) * 1988-02-09 1992-02-18 Sunds Defibrator Industries Aktiebolag Device for treating material mixtures
DD289754A5 (de) * 1989-12-08 1991-05-08 Ingenieurhochschule Koethen,De Vorrichtung zur pelletierungsflockung von feststoffen aus flockbaren suspensionen
DE4433039B4 (de) * 1994-09-16 2006-11-16 Richard Frisse Gmbh Vorrichtungen zum Bearbeiten von Dispersionen
JPH1029213A (ja) * 1996-07-15 1998-02-03 Toray Dow Corning Silicone Co Ltd 液状材料連続混合装置
US6808305B2 (en) * 2002-03-25 2004-10-26 Sharpe Mixers, Inc. Method and apparatus for mixing additives with sludge in a powered line blender

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006016067B3 (de) * 2006-04-04 2008-01-03 Clausthaler Umwelttechnikinstitut Gmbh, (Cutec-Institut) Flockenformeinrichtung
DE102018116196A1 (de) 2018-07-04 2020-01-09 Bma Braunschweigische Maschinenbauanstalt Ag Verfahren und Anordnung zur Fest-Flüssig-Trennung von Suspensionen, insbesondere von Klärschlamm unter Zugabe von Flockungsmitteln

Also Published As

Publication number Publication date
DE50203636D1 (de) 2005-08-18
JP2005504629A (ja) 2005-02-17
US20040262230A1 (en) 2004-12-30
US7135112B2 (en) 2006-11-14
DE10148760A1 (de) 2003-04-17
WO2003031040A1 (fr) 2003-04-17
EP1432502A1 (fr) 2004-06-30
DK1432502T3 (da) 2005-11-07
JP4386726B2 (ja) 2009-12-16
ATE299394T1 (de) 2005-07-15

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