EP0907409B1 - Verfahren und vorrichtung zum mischen von einem zweiten medium mit einer pulpe - Google Patents

Verfahren und vorrichtung zum mischen von einem zweiten medium mit einer pulpe Download PDF

Info

Publication number
EP0907409B1
EP0907409B1 EP97924040A EP97924040A EP0907409B1 EP 0907409 B1 EP0907409 B1 EP 0907409B1 EP 97924040 A EP97924040 A EP 97924040A EP 97924040 A EP97924040 A EP 97924040A EP 0907409 B1 EP0907409 B1 EP 0907409B1
Authority
EP
European Patent Office
Prior art keywords
casing
mixer
recited
rotor
medium
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
EP97924040A
Other languages
English (en)
French (fr)
Other versions
EP0907409A1 (de
Inventor
Kari Peltonen
Reijo Vesala
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 Pumpen AG
Original Assignee
Sulzer Pumpen 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
Priority claimed from PCT/FI1996/000330 external-priority patent/WO1997001074A1/en
Application filed by Sulzer Pumpen AG filed Critical Sulzer Pumpen AG
Publication of EP0907409A1 publication Critical patent/EP0907409A1/de
Application granted granted Critical
Publication of EP0907409B1 publication Critical patent/EP0907409B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • 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
    • B01F27/50—Pipe mixers, i.e. mixers wherein the materials to be mixed flow continuously through pipes, e.g. column mixers
    • 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
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/96—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with openwork frames or cages
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/342—Mixing apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
    • B01F35/32—Driving arrangements
    • B01F35/32005—Type of drive
    • B01F35/32015—Flow driven

Definitions

  • the present invention relates to a method and apparatus for mixing a second medium with a first medium.
  • the method and apparatus of the invention are especially suitable for mixing different chemicals, both fluid and gaseous ones, or steam with a so-called first medium, which is composed of both solid and fluid matter, like for example, cellulose fibre suspensions of the wood-processing industry or mixtures of, e.g., different beet chips (such as potato and sugar beet) and water.
  • Prior art mixers used for this purpose are disclosed, e.g., in US patents 5,279,709 and 5,575,559 and in patent applications EP-A-92921912, EP-A-9100973, WO-A-96/32186, and WO-A-96/33007. It is a characteristic feature of all mixers of the art that they employ a rotatable rotor in order to provide a sufficient mixing efficiency.
  • the rotatable rotor specifically refers to a member which is connected to the drive through a shaft and most usually receives its power from the electricity supply of the mill.
  • the mixer construction is usually such that a certain pressure loss occurs in the mixer.
  • the method and apparatus in accordance with the invention eliminate one of the power-losing factors mentioned above.
  • the rotor of the mixer is arranged to rotate freely in the flow, whereby the mixer naturally causes a certain pressure loss.
  • the pressure loss has not increased, at least not essentially, when compared with a motor-driven rotor.
  • no change in the mixing result can be found, at least not for the worse.
  • So-called static mixers are known in the art, but they are mostly of the type disclosed in, e.g., US patents 4,030,969, 5,492,409, and 5,556,200, in which a throttling effect of some degree is arranged in the flow channel, whereby the flow rate increases and the pressure is reduced.
  • the chemical or equivalent to be mixed is then conveyed to this lower-pressure zone, and the turbulence effect, also developed by throttling, then mixes the chemical or equivalent with the actual flow material.
  • Another alternative is disclosed in, for example, US patents 4,936,689 and 5,564,827, where the flow channel is provided with obstacles to flow so as to create turbulence. It is a characteristic feature of both types of mixers that the turbulence created is of local nature only and short in duration.
  • the kinetic energy originating from the pressure losses caused by the throttling device may be forwarded to the mixing zone in a more controlled manner and to a wider area, which will substantially grow the efficient mixing volume and substantially lengthen the mixing time.
  • Fig. 1 shows an apparatus in accordance with a preferred embodiment, comprising a casing 10, which in its simplest form is cylindrical in the direction of flow of the medium, but it may also be cylindrical in the direction of the rotor shaft.
  • the casing 10 of the mixer may also be of some other, more complicated shape, if such is considered reasonable.
  • the casing 10 is provided with an inlet 12 and an outlet 16, with flanges 14 and 18, respectively, the outlet being preferably tangential to the direction of rotation of the rotor, and with a rotor 20 arranged rotatably within the casing 10.
  • the mixer is attached through its flange 14 to a so-called inlet piping, i.e., the flow channel of the incoming fiber suspension, and through its flange 18 to a so-called outlet piping, i.e. the flow channel of the fiber suspension being discharged from the mixer.
  • the rotor 20 is formed of a shaft 22 mounted on bearings to a wall of the casing 10, the shaft being preferably perpendicular to the axis X of the casing 10.
  • the shaft 22 is congruent or at least parallel with the inlet axis.
  • the rotor blades should be helical in order for the rotor to rotate.
  • At least two blades 24 are attached to that end of the shaft 22 which extends to the inside of the casing 10, so that an open space remains in the center of the rotor 20 when the blades 24 rotate.
  • the embodiment shown in Fig. 1 is provided with five blades 24, and they are substantially rectangular in cross section while the main axis is radial. The most essential thing, with regard to the shape of the blades is, however, that it makes the rotor rotate and also brings about the desired mixing effect.
  • the blades 24 extend preferably to a distance of about 10 to 80 mm from the wall of the casing 10.
  • the rotor 20 may be disposed in the casing 10 either centrally so that the distance of the circle of rotation C of the blades 24 from the wall of the casing 10 is equal on both sides of the rotor 20 or eccentrically so that the clearance between the circle of rotation C and the wall of the casing 10 is smaller on one side of the rotor 20 than on the other side.
  • the rotor 20 or, more specifically, the rotor blades may be, e.g., such in shape that the shape of the surface of revolution is substantially spherical or cylindrical. Also other shapes of the surface of revolution are feasible as long as they are fitted together with the cross-sectional shape of the casing.
  • the casing may also be provided with ribs 26 and 28 which, together with the rotor 20, cause a turbulence which brings about an adequate mixing effect in the suspension flow.
  • the rib 26 is so arranged in connection with the inlet 12 that it directs the axial flow from the inlet 12 to the casing 10 of the mixer to one side of the casing 10, thereby ensuring rotation of the rotor 20.
  • rib 26 may also be, e.g., a plate disposed perpendicularly to the axis of the flow path, covering part of the flow path. The most essential thing is that the member deviates the mass center of the flow from the axis of the flow channel.
  • the freely rotatable mixer shown in Fig. 1 is as such applicable for use with the heat exchanger illustrated in Fig. 6 of PCT/FI96/00330, in which two heat exchangers are connected in series so that the tube between the heat exchangers is provided with a mixing member.
  • the mixer by no means needs to fluidize pulp; "stirring" is sufficient for thorough mixing of pulp particles with each other, no matter of what size they are at this stage.
  • the mixer may be, e.g., an apparatus similar to the one shown in Fig. 1 or an apparatus where the mixing member is a circular or elliptic ring, which rotates freely in the flow under the effect of the flow.
  • Fig. 1 further illustrates how the casing of the mixer may be provided with an auxiliary, i.e., a control valve 30, either as an integral part of the mixer or, alternatively, attached to the mixer flange 14.
  • the control valve 30 shown in Fig. 1 is a conventional gate valve, but also other forms of valves are applicable.
  • One task of the valve 30 is naturally to control the flow, whereby locating the rotor 20 near the valve 30 also contributes to the operation of the valve 30, ensuring that fibers cannot adhere to the gate or other valve member and thereby gradually cause the valve opening 32 to become clogged.
  • Another task of the valve 30 is essential to the mixer, namely, it directs the flow in an eccentric form into the mixer casing 10. By ensuring that the flow entering the casing 10 is eccentric, especially respective of the rotor shaft, one may be sure that the rotor 20 rotates in all circumstances in the direction of arrow A.
  • Fig. 1 also illustrates how either the mixer casing 10 or the inlet piping may be provided with a conduit 38, 38' for adding a chemical, dilution liquid, steam, or other material to the flow.
  • the valve potentially attached to the flange 14 of the casing 10 can be considered to be a part of said inlet piping.
  • Location of a chemical feed conduit is chosen optimally in accordance with both the mixer operation and the medium to be mixed. For example, when liquid is fed, it is advantageous to direct the incoming liquid jet in the direction of rotation of the rotor in order not to decelerate rotation.
  • the inlet conduit for gas is preferably disposed in the lower section of the casing and the outlet in the upper section thereof in order for the gas flow from the inlet to the outlet to proceed reliably.
  • the mixing conduit 38 has to be located far enough from the outlet 16 of the casing 10 of the mixer so that the chemical or equivalent has an adequate time to mix well enough with the pulp prior to being discharged from the mixer. It could be a guideline that the mixing conduit 38 should be disposed ,against the direction of rotation of the rotor at an angular distance of at least 90 degrees, preferably 180 degrees, from outlet 16.
  • the medium to be mixed also sets its own limits to the location of the mixing conduit.
  • Fig. 2 illustrates a mixing apparatus in accordance with a second preferred embodiment.
  • the same reference numerals as in Fig. 1 have been used where applicable, except that all reference numerals of Fig. 2 start with number 1.
  • a valve 130 is illustrated as a member which is clearly separate from the casing 10 of the mixer, which member is attached to a flange 114 of the casing.
  • Another difference is to locate the outlet 116 of the casing 10 at an angle of 90 degrees, or if a widening of the outlet is taken into account, at an angle of approximately 100 degrees with respect to the inlet piping.
  • the outlet 116 is provided with an outlet pipe 140 which widens preferably in the direction of flow just like a diffuser pipe.
  • the purpose of the widening of the outlet duct 140 is to recover dynamic pressure from the flow being discharged from the casing 10 of the mixer.
  • Fig. 3 shows a mixing apparatus in accordance with a third preferred embodiment.
  • the same reference numerals as in Fig. 1 have been used where applicable, except that all reference numerals of Fig. 3 start with number 2.
  • the outlet 216 of the mixer is disposed opposite to the inlet 212 of the mixer. Further, the outlet 216 is provided with an outlet pipe 240, as in Fig. 2. Unlike the outlet pipe 140 of Fig. 2, which is an integral part of the mixer casing 10, the outlet pipe 240 of Fig. 3 is attached to the flange 218 of the outlet 216 of the casing 10.
  • a detachable outlet pipe may be disposed also in a mixer discharged from its side as in Fig. 2, and a stationary outlet pipe also in an arrangement as shown in Fig. 3.
  • the apparatus functions so that throttling, effected by either a valve or a rib, on the inlet side of the mixer controls the velocity of the fiber suspension jet entering the mixer, to be preferably in the range of 5 to 30 m/s, more preferably in the range of 10 to 20 m/s.
  • the combination of the flow being deviated from the central flow direction and said flow velocity makes the rotor 20 arranged in the casing 10 rotate.
  • the mixer causes a pressure loss of the order of 0.5 to 3.5 bar, preferably 0.5 to 2.5 bar, most of the pressure loss being caused by throttling arranged at the inlet of the mixer by means of a valve or a rib 26.
  • the pressure loss is controllable, by adjusting the inlet side throttling.
  • the total pressure loss caused by the mixer may be reduced by shaping the outlet pipe of the outlet side of the mixer optimal, i.e., such that it will recover part of the dynamic pressure.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
  • Silicon Compounds (AREA)

Claims (22)

  1. Verfahren zur Mischung eines zweiten Mediums d. h. von flüssigen oder gasförmigen Chemikalien oder Dampf mit Faserstoff, d. h. Suspensionen von Feststoff und Flüssigkeit, bei welchem Verfahren der Faserstoff in das Gehäuse einer Mischvorrichtung eingeführt wird, wo er mit dem zweiten Medium gemischt und daraus abgeleitet wird, dadurch gekennzeichnet, dass der im Gehäuse angeordnete Läufer (20) des Mischers mit Hilfe des Faserstoffs rotiert wird, der durch das Gehäuse (10) fließt, und zur Mischung des Faserstoffs mit dem zweiten Medium wirksam ist.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass das zweite zu mischende Medium stromaufwärts vom Läufer (20) in das Gehäuse (10) des Mischers oder in die, dem Mischer vorangehende Zulaufleitung (38) eingeführt wird.
  3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Schwerpunkt des in das Gehäuse (10) eintretenden Mediumstroms von der zentralen Strömung verlagert wird, um die Strömung derart zu leiten, dass sie geeignet ist, den Läufer (20) des Mischers in Drehung zu versetzen.
  4. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die in das Mischergehäuse (10) eintretende Strömung zur Regelung der Strömungsgeschwindigkeit gedrosselt wird, um sie fürs Drehen des Mischerläufers geeignet zu machen.
  5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die in das Gehäuse (10) des Mischers eintretende Strömung gedrosselt wird, um eine erwünschte Druckdifferenz zu erreichen.
  6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass die Druckdifferenz in einen Bereich von 0,5 bis 2,5 bar eingestellt wird.
  7. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Geschwindigkeit des in das Gehäuse des Mischers eintretenden Mediumstroms nach der Drosselung 10 bis 20 m/s ist.
  8. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass aus der aus dem Mischer abgeleiteten Strömung dynamischer Druck zurückgewonnen wird.
  9. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass es sich beim zweiten zu mischenden Medium um Dampf, Wasser, Sauerstoff, Chlordioxid oder einen anderen entsprechender Stoff handelt.
  10. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass mit Hilfe des Läufers zusammen mit am Gehäuse (10) vorgesehenen mit Rippen (26, 28) Turbulenz erzeugt wird zur Mischung des zweiten Mediums mit dem Faserstoff.
  11. Vorrichtung zur Mischung eines zweiten Mediums d. h. von flüssigen oder gasförmigen Chemikalien oder Dampf mit Faserstoff, d. h. Suspensionen von Feststoff und Flüssigkeit, umfassend ein Mischergehäuse (10) mit einem Einlass (12), der über seinen Flansch (14) an einer Zulaufleitung befestigt ist, und einem Auslass (16), der einen Flansch (18) hat, und mit einem Läufer (20), welches Gehäuse (10) oder welche Zulaufleitung des Mischers mit einem Stutzen (38, 38'; 138, 138'; 238, 238') versehen ist zur Zuführung eines zweiten Mediums zum Faserstoff, dadurch gekennzeichnet, dass der Läufer (20) frei drehbar, zur Mischung des Faserstoffs mit dem zweiten Medium wirksam ist und konstruktionsmäßig so arrangiert ist, dass er mit Hilfe des Faserstoffs rotiert werden kann, der durch das Gehäuse (10) fließt.
  12. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass der Einlass (12) des Gehäuses (10) mit Organen (26, 126, 226; 30, 130, 230) zur Drosselung der Strömung versehen ist.
  13. Vorrichtung nach Anspruch 12, dadurch gekennzeichnet, dass das Drosselorgan eine nahe dem Einlass im Gehäuse angeordnete Rippe (26, 126, 226) ist zur Verlagerung des Schwerpunkts der in das Gehäuse (10) eintretenden Strömung von der zentralen Strömung.
  14. Vorrichtung nach Anspruch 12, dadurch gekennzeichnet, dass das Drosselorgan ein nahe dem Einlass (12) angeordnetes Ventil (30, 130, 230) ist zur Verlagerung des Schwerpunkts der in das Gehäuse (10) eintretenden Strömung von der zentralen Strömung.
  15. Vorrichtung nach Anspruch 14, dadurch gekennzeichnet, dass das Ventil (30, 130, 230) entweder als Teil des Mischergehäuses (10) oder zur Befestigung am Flansch (14) des Gehäuses (10) des Mischers angeordnet ist oder um sonst als Teil der Zulaufleitung des Mischers zu dienen.
  16. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass das Gehäuse zumindest mit einem Mischorgan (26, 28; 126, 128; 226, 228) versehen ist.
  17. Vorrichtung nach Anspruch 16, dadurch gekennzeichnet, dass zumindest eines der Mischorgane (26, 28; 126, 128; 226, 228) der Drehrichtung des Läufers gegenüber mit einem Winkelabstand von zumindest 90 Grad vom Auslass (16) des Gehäuses (10) angeordnet ist.
  18. Vorrichtung nach Anspruch 15 oder 16, dadurch gekennzeichnet, dass das Mischorgan eine Rippe (26, 28; 126, 128; 226, 228) ist, die an einer Wand des Gehäuses (10) befestigt ist.
  19. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass der Auslass (116, 216) des Gehäuses (10) mit einem diffusorartigen Ablaufrohr versehen ist, das dynamischen Druck zurückgewinnt.
  20. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass der Läufer aus einer Welle, die auf Lagern im Gehäuse montiert ist, und aus Blättern gebildet wird, die das Läuferzentrum offen lassen.
  21. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass der Einlass und Auslass (12, 16) in Hinsicht aufeinander auf solche Weise angeordnet sind, dass sich die Strömungsrichtung am meisten ungefähr 100 Grad ändert, wenn die Strömung die Vorrichtung passiert.
  22. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, dass der Auslass (16, 116, 216) tangential zur Drehrichtung des Läufers ist.
EP97924040A 1996-06-03 1997-05-29 Verfahren und vorrichtung zum mischen von einem zweiten medium mit einer pulpe Expired - Lifetime EP0907409B1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
WOPCT/FI96/00330 1996-06-03
PCT/FI1996/000330 WO1997001074A1 (en) 1995-06-20 1996-06-03 Method and apparatus for treating material which conducts heat poorly
FI965137A FI104621B (fi) 1996-06-03 1996-12-20 Menetelmä ja laite toisen väliaineen sekoittamiseksi ensimmäiseen väliaineeseen
FI965137 1996-12-20
PCT/FI1997/000325 WO1997046309A1 (en) 1996-06-03 1997-05-29 Method and apparatus for mixing a second medium with a first medium

Publications (2)

Publication Number Publication Date
EP0907409A1 EP0907409A1 (de) 1999-04-14
EP0907409B1 true EP0907409B1 (de) 2001-12-12

Family

ID=26160283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97924040A Expired - Lifetime EP0907409B1 (de) 1996-06-03 1997-05-29 Verfahren und vorrichtung zum mischen von einem zweiten medium mit einer pulpe

Country Status (6)

Country Link
EP (1) EP0907409B1 (de)
AT (1) ATE210492T1 (de)
CA (1) CA2256594C (de)
DE (1) DE69709102T2 (de)
FI (1) FI104621B (de)
WO (1) WO1997046309A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT413017B (de) * 2002-03-21 2005-10-15 Andritz Ag Maschf Verfahren und vorrichtung zum einmischen von fluiden in fliessfähige medien

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US735530A (en) * 1902-10-22 1903-08-04 Paul Kuehne Apparatus for mixing concrete.
GB811186A (en) * 1956-10-04 1959-04-02 Elliots Newark Ltd Improvements in gas filters
DE1811609C3 (de) * 1967-12-01 1978-06-29 E.I. Du Pont De Nemours And Co., Wilmington, Del. (V.St.A.) Mischvorrichtung zur Herstellung von Isocyanaten
US4030969A (en) * 1972-06-13 1977-06-21 Defibrator Ab Method of dispersing a bleaching agent into a stream of fibrous cellulosic pulp material in a throttling nozzle
SE468789B (sv) * 1991-09-05 1993-03-22 Sunds Defibrator Ind Ab Foerfarande och anordning foer inblandning av behandlingsmedium i en massasuspension
US5258100A (en) * 1992-02-28 1993-11-02 Kamyr, Inc. Minimizing gas separation in a mixer outlet
FI103019B1 (fi) * 1994-01-25 1999-04-15 Ahlstroem Oy Menetelmä ja laite kaasumaisen kemikaalin sekoittamiseksi kuitususpensioon

Also Published As

Publication number Publication date
DE69709102D1 (de) 2002-01-24
ATE210492T1 (de) 2001-12-15
CA2256594C (en) 2006-09-26
FI965137A0 (fi) 1996-12-20
DE69709102T2 (de) 2002-07-18
CA2256594A1 (en) 1997-12-11
EP0907409A1 (de) 1999-04-14
FI104621B (fi) 2000-03-15
FI965137A (fi) 1997-12-04
WO1997046309A1 (en) 1997-12-11

Similar Documents

Publication Publication Date Title
US5575559A (en) Mixer for mixing multi-phase fluids
CA2113450C (en) Method and apparatus for separating gas from a gaseous material
EP2234706B1 (de) Verfahren und vorrichtung zum mischen einer zellstoffsuspension
US5791778A (en) Method and apparatus for mixing gaseous chemical to fiber suspension
US9339777B2 (en) Method, an apparatus and a rotor for homogenizing a medium
US6193406B1 (en) Method and apparatus for mixing pulp a suspension with a fluid medium with a freely rotatable mixing rotor
CA2281826C (en) Centrifugal liquid pump with internal gas injection
EP1843831B1 (de) Verfahren und vorrichtung zur speisung gasförmiger oder flüssiger flüssigkeiten in ein medium
EP0723476B1 (de) Zentrifugale flüssigkeitspumpe mit inwendiger gasinjektionsvorrichting
EP0907409B1 (de) Verfahren und vorrichtung zum mischen von einem zweiten medium mit einer pulpe
WO1999016539A1 (en) Reactor mixing assembly
US6673211B2 (en) Apparatus for loading fibers in a fiber suspension with calcium carbonate
NZ253802A (en) Device for admixing a processing agent to a pulp suspension in a container
US5918978A (en) Device for mixing chemicals into a fibrous material suspension
US5702646A (en) Mixing head for mixing fluids, in particular gases and/or liquids
EP0912235B1 (de) Vorrichtung zum mischen von medien
US6213632B1 (en) Apparatus for treating an aqueous working medium by shearing in annular treatment slots of varying sizes
CA1256101A (en) Mixer for continuously mixing fluids
JPH0518619B2 (de)
WO1997038788A1 (en) Apparatus for mixing of media

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19981207

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT DE FI FR SE

17Q First examination report despatched

Effective date: 19991011

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

RTI1 Title (correction)

Free format text: METHOD AND APPARATUS FOR MIXING A SECOND MEDIUM WITH PULP

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SULZER PUMPEN AG

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE FI FR SE

REF Corresponds to:

Ref document number: 210492

Country of ref document: AT

Date of ref document: 20011215

Kind code of ref document: T

REF Corresponds to:

Ref document number: 69709102

Country of ref document: DE

Date of ref document: 20020124

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20090514

Year of fee payment: 13

Ref country code: FR

Payment date: 20090513

Year of fee payment: 13

Ref country code: FI

Payment date: 20090515

Year of fee payment: 13

Ref country code: DE

Payment date: 20090525

Year of fee payment: 13

Ref country code: AT

Payment date: 20090515

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100529

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100529

EUG Se: european patent has lapsed
REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20110131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100530

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101201

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20100531