EP0907409B1 - Procede et dispositif pour melanger un second milieu a une pulpe - Google Patents

Procede et dispositif pour melanger un second milieu a une pulpe Download PDF

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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
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German (de)
English (en)
Other versions
EP0907409A1 (fr
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/fr
Application filed by Sulzer Pumpen AG filed Critical Sulzer Pumpen AG
Publication of EP0907409A1 publication Critical patent/EP0907409A1/fr
Application granted granted Critical
Publication of EP0907409B1 publication Critical patent/EP0907409B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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.

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  • 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. Procédé de mélange d'un second milieu, c'est-à-dire des produits chimiques fluides ou gazeux ou de la vapeur, avec de la pâte, c'est-à-dire des suspensions de matières solides et du liquide, dans lequel procédé la pâte est délivrée dans le logement du dispositif de mélange où elle est mélangée avec le second milieu et évacuée de celui-ci,
    dans lequel le rotor (20) du mélangeur, disposé dans le logement, est fait tourner au moyen de la pâte s'écoulant par l'intermédiaire du logement (10) et mélange efficacement la pâte avec le second milieu.
  2. Procédé selon la revendication 1, caractérisé en ce que ledit second milieu à mélanger est délivré dans le logement (10) du mélangeur en amont du rotor (20) ou dans la conduitc d'admission (38) précédent le mélangeur.
  3. Procédé selon la revendication 1, caractérisé en ce que le centre de gravité du courant du milieu pénétrant dans le logement (10) du mélangeur est dévié du courant central, pour guider convenablement le courant afin de faire tourner le rotor (20) du mélangeur.
  4. Procédé selon la revendication 1, caractérisé en ce que le courant pénétrant dans le logement du mélangeur (10) est étranglé, pour commander la vitesse d'écoulement de manière à la rendre appropriée à faire tourner le rotor du mélangeur.
  5. Procédé selon la revendication 1, caractérisé en ce que le courant pénétrant dans le logement (10) du mélangeur est étranglé de manière à obtenir une différence de pression voulue.
  6. Procédé selon la revendication 5, caractérisé en ce que la différence de pression est réglée à une plage allant de 0,5 à 2,5 bar.
  7. Procédé selon la revendication 4, caractérisé en ce que la vitesse du courant du milieu pénétrant dans le logement du mélangeur après l'étranglement est comprise entre 10 et 20 m/s.
  8. Procédé selon la revendication 1, caractérisé en ce qu'une pression dynamique est récupérée du courant évacué du mélangeur.
  9. Procédé selon la revendication 1, caractérisé en ce que ledit second milieu à mélanger est de la vapeur, de l'eau, de l'oxygène, du dioxyde de chlore ou toute autre matière équivalente.
  10. Procédé selon la revendication 1, caractérisé en ce que l'on crée une turbulence au moyen dudit rotor avec des nervures (25, 28) pourvues sur le logement (10) pour mélanger ledit second milieu avec la pâte.
  11. Dispositif pour mélanger un second milieu, c'est-à-dire des produits chimiques fluides ou gazeux ou de la vapeur avec de la pâte, c'est-à-dire des suspensions de matières solides et du liquide, comprenant un logement du mélangeur (10) avec un orifice d'entrée (12) fixé de son flasque (14) à une conduite d'admission et un orifice de sortie (16) présentant un flasque (18), et un rotor (20), ledit logement (10) ou ladite conduite d'admission du mélangeur étant pourvu d'un conduit (38, 38' ; 138, 138' ; 238, 238') pour délivrer un second milieu dans ladite pâte,
    dans lequel
    le rotor (20) est librement rotatif, efficace pour mélanger la pâte avec le second milieu, et disposé du point de vue de la structure de manière à ce que l'on puisse le faire tourner au moyen de la pâte s'écoulant par l'intermédiaire du logement (10).
  12. Dispositif selon la revendication 11, caractérisé en ce que l'orifice d'entrée (12) du logement (10)est muni d'éléments (26, 126, 226 ; 30, 130, 230) pour étrangler l'écoulement.
  13. Dispositif selon la revendication 12, caractérisé en ce que l'élément d'étranglement est une nervure (26, 126, 226) disposée au voisinage de l'admission dans le logement, pour dévier le centre de gravité du courant pénétrant dans le logement (10) de l'écoulement central.
  14. Dispositif selon la revendication 12, caractérisé en ce que l'élément d'étranglement est une vanne (30, 130, 230) disposée au voisinage de l'admission (12), pour dévier le centre de gravité du courant pénétrant dans le logement (10) de l'écoulement central.
  15. Dispositif selon la revendication 14, caractérisé en ce que la vanne (30, 130, 230) est disposée, soit en tant que partie du logement du mélangeur (10), soit pour être fixée au flasque (14) du logement (10) ou bien pour servir autrement en tant que partie-de la conduite d'admission du mélangeur.
  16. Dispositif selon la revendication 11, caractérisé en ce que le logement est prévu d'au moins un élément de mélange (26, 28 ; 126, 128 ; 226, 228).
  17. Dispositif selon la revendication 16, caractérisé en ce qu'au moins un des éléments de mélange (26, 28 ; 126, 128 ; 226, 228) est disposé contre le sens de rotation du rotor à une distance angulaire d'au moins 90° de l'orifice de sortie (16) du logement (10).
  18. Dispositif selon la revendication 15 ou 16, caractérisé en ce que l'élément de mélange est une nervure (26, 28 ; 126, 128 ; 226, 228) fixée à la paroi du logement (10).
  19. Dispositif selon la revendication 11, caractérisé en ce que l'orifice de sortie (116, 216) du logement (10) est pourvu d'un tuyau d'évacuation du type diffuseur, qui récupère de la pression dynamique.
  20. Dispositif selon la revendication 11, caractérisé en ce que le rotor est formé d'un arbre monté sur des paliers dans le logement et d'ailettes qui laissent le centre du rotor ouvert.
  21. Dispositif selon la revendication 11, caractérisé en ce que l'orifice d'entrée et de sortie (12, 16) sont disposés l'un par rapport à l'autre de sorte que le sens du courant change d'environ 100° au maximum lorsque le courant passe à travers le dispositif.
  22. Dispositif selon la revendication 11, caractérisé en ce que l'orifice de sortie (16, 116, 216) est tangentiel dans le sens de rotation du rotor.
EP97924040A 1996-06-03 1997-05-29 Procede et dispositif pour melanger un second milieu a une pulpe Expired - Lifetime EP0907409B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
WOPCT/FI96/00330 1996-06-03
PCT/FI1996/000330 WO1997001074A1 (fr) 1995-06-20 1996-06-03 Procede et dispositif de traitement d'un materiau faiblement thermoconducteur
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 (fr) 1996-06-03 1997-05-29 Procede et dispositif pour melanger un second milieu a un premier milieu

Publications (2)

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

Family

ID=26160283

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97924040A Expired - Lifetime EP0907409B1 (fr) 1996-06-03 1997-05-29 Procede et dispositif pour melanger un second milieu a une pulpe

Country Status (6)

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

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
GB1255638A (en) * 1967-12-01 1971-12-01 Du Pont Improvements in mixing apparatus
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
FI103019B (fi) * 1994-01-25 1999-04-15 Andritz Ahlstrom Oy Menetelmä ja laite kaasumaisen kemikaalin sekoittamiseksi kuitususpens ioon

Also Published As

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

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