WO1987000450A1 - Double sided mixer - Google Patents

Double sided mixer Download PDF

Info

Publication number
WO1987000450A1
WO1987000450A1 PCT/US1986/000575 US8600575W WO8700450A1 WO 1987000450 A1 WO1987000450 A1 WO 1987000450A1 US 8600575 W US8600575 W US 8600575W WO 8700450 A1 WO8700450 A1 WO 8700450A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotors
pulp
mixer
housing
circular disk
Prior art date
Application number
PCT/US1986/000575
Other languages
French (fr)
Inventor
Michael Dean Meredith
Joseph Maria Bentvelzen
Marvin Franklin Jordan
Original Assignee
Weyerhaeuser Company
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 Weyerhaeuser Company filed Critical Weyerhaeuser Company
Publication of WO1987000450A1 publication Critical patent/WO1987000450A1/en

Links

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
    • B01F27/27—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices
    • B01F27/271—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed radially between the surfaces of the rotor and the stator
    • B01F27/2711—Mixers with stator-rotor systems, e.g. with intermeshing teeth or cylinders or having orifices with means for moving the materials to be mixed radially between the surfaces of the rotor and the stator provided with intermeshing 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
    • B01F2025/91—Direction of flow or arrangement of feed and discharge openings
    • B01F2025/912—Radial flow
    • 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
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
    • B01F27/191—Stirrers with two or more mixing elements mounted in sequence on the same axis with similar elements

Definitions

  • the Jardina mixer has an asymetrical flow and has long pins agitating the pulp. However, better mixing is provided by a symetrical flow.
  • the instant invention has a design in which pins are placed on both sides of a rotating plate to obtain greater mixing per unit power and to cause the pulp to exit on the back side of the rotating plate in order to provide uniform and symetrical flow of the pulp through the mixer.
  • Figure 1 is a cross-sectional view of the mixer.
  • Figure 2 is a back plan view of the mixer with a portion cut away along line 2-2 of Figure 1.
  • Figures 3 and 4 are isometric views of the rotors, Figure 3 showing a double sided rotor and Figure 4 showing a single sided rotor.
  • Figure 5 is a front plan view of the mixer with a portion cut away along line 3-3 of Figure 1.
  • the mixer 10 has a housing 15 and a rotating member 70.
  • the housing 15 has an inlet pipe 20, a body 30 and a back plate 55 with outlet pipes 57.
  • the inlet 20 is a cylindrical pipe 21 having a collar or flange 22 on its outer end.
  • the linings 24, 25 and 26 are continuous and are composed of SYGEF, a trade name for a highly crystalline organic-fluoride polymer, to resist corrosion.
  • the cylinder 21 is attached to the body 30.
  • the body has a front plate 31 and side walls 32 forming a bowl.
  • Anti-rotation vanes 33 are spaced around the inner periphery of the side walls 32.
  • Each of the anti-rotation vanes 33 has a central relief 34 to accommodate the rotating member 70.
  • the baffles prevent the rotation of the pulp slurry while it is being mixed by the rotating member.
  • the body members are also lined. There is a lining 35 on the inner face of the front plate 31, a lining 36 on the inner face of the side wall 32 and a lining 37 on the edge of side wall 32.
  • Stators are located on the front plate. There is a cincture of outer stators 38 and a cincture of inner stators 43 surrounding the inlet 20 mounted on the front plate 31.
  • the outer stators 38 have outer heads 39 and attachment threads 40.
  • the stators 38 are threaded into inserts 41 in the front plate 31.
  • the inserts 41 have threads 42 into which the threads 40 of stator 38 are threaded.
  • the inner stators 43 have outer heads 44 and threads 45 and again are inserted into inserts 46 in the front plate 31 which have threads 47.
  • the gas passage 48 extends through the stator 43 for the introduction of gases and liquids into the mixer.
  • An additional gas passage 100 extends through the shaft 84 and the rotating member 70 to a midpoint on the neutral axis of the rotor 81.
  • the body 30 is attached to the back plate 55 by bolts -49 and nuts 50.
  • the back plate 55 also has a lining 56 and a pair of outlets 57 fastened to it.
  • the outlets 57 are preferably elbows.
  • the elbows are shown as being short, but they may extend upwardly above the upper edge of back plate 55.
  • a mechanical seal 58 surrounds the shaft 84 and is sealed to the back plate 55 with an O-ring 59 to prevent pulp fiber from exiting the housing 15.
  • the rotating member 70 has a circular main frame 71 driven by a shaft 84 connected to a motor 101.
  • the shaft 84 narrows to a square stem 89 that supports and translates torque to a brace 90, a back cone 76, a rotor disk 72 and two laminae 74.
  • the brace 90, back cone 76 and rotor disk are attached to the stem 89 by a washer 87 and nut 88 secured to the stem 89 by a stud 86.
  • a front cap 75 is attached to the laminae 74 by welding to form the front cone 73.
  • the circular main frame 71 has a front cone 73, a rotor disk 72 and a back cone 76 braced against the stem 89 by a brace 90.
  • the linings 77, 91 and 85 are continuous and are also composed
  • the rotor disk 72 has a cincture of outer double sided rotors 78 and cincture of inner single sided rotors 81.
  • the inner single sided rotors 81 have a base 82 and an extension
  • the base 82 inserts into the front side of the rotor disk 72 for attachment of the inner rotor to the rotor disk.
  • the inner single sided rotors 81 are placed on the rotor disk 72 to extend between the outer stators 38 and the inner stators 43.
  • the outer double sided rotors 78 have a base 79 and two extensions 80.
  • the base 79 inserts into either side of the rotor disk 72 for attachment of the inner rotor to the rotor disk.
  • the outer double sided rotors 78 are placed on the rotor disk 72 to extend from the front side of the rotor disk to lie between the outer stators 38 and the anti-rotation vanes 33.
  • the rotors 78 also extend from the back side of the rotor disk to lie adjacent to the anti-rotation vanes 33 on the pulp outlet side of the mixer 10.
  • Wood pulp having a consistency of 1-18% on a dry basis enters the double sided mixer through the inlet pipe 20.
  • the pulp is evenly distributed to the periphery of the mixer by the front cone 73.
  • As the pulp passes to the periphery of the mixer it transversely passes cinctures of rotors and stators where mixing of pulp with fluids, such as gases and liquids, occurs.
  • the effectiveness of mixing is determined by swept area as shown in U.S. Patent 4,303,470. For example, an increase in swept area is obtained by an increase in the length of rotors, travel of rotors and rotation of the rotating member 70.
  • the passage of pulp transverse to the rotors is maintained by anti-rotation vanes 33.
  • the anti-rotation vanes enable the pulp to move radially across the rotating member to obtain maximum swept area per rotor length, travel and rotation speed. After passing axially by the anti-rotation vanes, the pulp transversely passes more rotors and moves radially towards the mixer axis and completes its movement around the rotating member. The pulp is guided towards outlet pipes 57 by a back cone 76 and discharged.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

A double sided mixer promotes efficient and effective chemical bleaching of pulp. In the case of oxygen bleaching, mixing of gas by the transverse motion of rotors (78, 81) through the pulp occurs throughout the mixer (10). A double sided mixer has more rotors per unit volume, and low energy and material requirements.

Description

DOUBLE SIDED MIXER
BACKGROUND OF THE INVENTION There are many mixers used with wood pulp. One is described in U.S. Patent 4,303,470. A mixer manufactured by Kamyr is described in "State of the Art Chlorine Dioxide Mixer Installed at Weyerhaeuser," Pulp & Paper, June 1984, pp. 119-121. A mixer is the subject of U.S. Patent 4,435,085. We are aware of mixers manufactured by Rauma-Repola of Finland and IMPCO of U.S.A. Advertisements describing the Rauma-Repola mixer are included with this patent application.
SUMMARY OF THE INVENTION
The Rauma mixer has an asymetrical flow and has long pins agitating the pulp. However, better mixing is provided by a symetrical flow.
Further, less power is required when pins are better utilized. The instant invention has a design in which pins are placed on both sides of a rotating plate to obtain greater mixing per unit power and to cause the pulp to exit on the back side of the rotating plate in order to provide uniform and symetrical flow of the pulp through the mixer.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view of the mixer. Figure 2 is a back plan view of the mixer with a portion cut away along line 2-2 of Figure 1. Figures 3 and 4 are isometric views of the rotors, Figure 3 showing a double sided rotor and Figure 4 showing a single sided rotor.
Figure 5 is a front plan view of the mixer with a portion cut away along line 3-3 of Figure 1.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to Figures 1-5, the mixer 10 has a housing 15 and a rotating member 70. The housing 15 has an inlet pipe 20, a body 30 and a back plate 55 with outlet pipes 57. The inlet 20 is a cylindrical pipe 21 having a collar or flange 22 on its outer end. There are bolt holes 23 in the outer flange 22 for fastening the inlet to a pipe. There is a lining 24 on the cylindrical pipe 21 and an outer lining 25 on the outer face of flange 22 and a lining 26 on the inner edge of the cylinder 21. The linings 24, 25 and 26 are continuous and are composed of SYGEF, a trade name for a highly crystalline organic-fluoride polymer, to resist corrosion. The cylinder 21 is attached to the body 30. The body has a front plate 31 and side walls 32 forming a bowl. Anti-rotation vanes 33 are spaced around the inner periphery of the side walls 32. Each of the anti-rotation vanes 33 has a central relief 34 to accommodate the rotating member 70. The baffles prevent the rotation of the pulp slurry while it is being mixed by the rotating member. The body members are also lined. There is a lining 35 on the inner face of the front plate 31, a lining 36 on the inner face of the side wall 32 and a lining 37 on the edge of side wall 32. Stators are located on the front plate. There is a cincture of outer stators 38 and a cincture of inner stators 43 surrounding the inlet 20 mounted on the front plate 31. The outer stators 38 have outer heads 39 and attachment threads 40. The stators 38 are threaded into inserts 41 in the front plate 31. The inserts 41 have threads 42 into which the threads 40 of stator 38 are threaded. The inner stators 43 have outer heads 44 and threads 45 and again are inserted into inserts 46 in the front plate 31 which have threads 47. The gas passage 48 extends through the stator 43 for the introduction of gases and liquids into the mixer.
An additional gas passage 100 extends through the shaft 84 and the rotating member 70 to a midpoint on the neutral axis of the rotor 81.
The body 30 is attached to the back plate 55 by bolts -49 and nuts 50. The back plate 55 also has a lining 56 and a pair of outlets 57 fastened to it. The outlets 57 are preferably elbows. The elbows are shown as being short, but they may extend upwardly above the upper edge of back plate 55. A mechanical seal 58 surrounds the shaft 84 and is sealed to the back plate 55 with an O-ring 59 to prevent pulp fiber from exiting the housing 15.
The rotating member 70 has a circular main frame 71 driven by a shaft 84 connected to a motor 101. The shaft 84 narrows to a square stem 89 that supports and translates torque to a brace 90, a back cone 76, a rotor disk 72 and two laminae 74. The brace 90, back cone 76 and rotor disk are attached to the stem 89 by a washer 87 and nut 88 secured to the stem 89 by a stud 86. A front cap 75 is attached to the laminae 74 by welding to form the front cone 73. Thus, the circular main frame 71 has a front cone 73, a rotor disk 72 and a back cone 76 braced against the stem 89 by a brace 90. There is a lining 77 on the back cone 76, a lining 91 on the brace 90 and a lining 85 on the shaft 84. The linings 77, 91 and 85 are continuous and are also composed of SYGEF.
The rotor disk 72 has a cincture of outer double sided rotors 78 and cincture of inner single sided rotors 81. The inner single sided rotors 81 have a base 82 and an extension
83. The base 82 inserts into the front side of the rotor disk 72 for attachment of the inner rotor to the rotor disk. The inner single sided rotors 81 are placed on the rotor disk 72 to extend between the outer stators 38 and the inner stators 43. The outer double sided rotors 78 have a base 79 and two extensions 80. The base 79 inserts into either side of the rotor disk 72 for attachment of the inner rotor to the rotor disk. The outer double sided rotors 78 are placed on the rotor disk 72 to extend from the front side of the rotor disk to lie between the outer stators 38 and the anti-rotation vanes 33. The rotors 78 also extend from the back side of the rotor disk to lie adjacent to the anti-rotation vanes 33 on the pulp outlet side of the mixer 10.
Wood pulp having a consistency of 1-18% on a dry basis enters the double sided mixer through the inlet pipe 20. The pulp is evenly distributed to the periphery of the mixer by the front cone 73. As the pulp passes to the periphery of the mixer it transversely passes cinctures of rotors and stators where mixing of pulp with fluids, such as gases and liquids, occurs. The effectiveness of mixing is determined by swept area as shown in U.S. Patent 4,303,470. For example, an increase in swept area is obtained by an increase in the length of rotors, travel of rotors and rotation of the rotating member 70. The passage of pulp transverse to the rotors is maintained by anti-rotation vanes 33. The anti-rotation vanes enable the pulp to move radially across the rotating member to obtain maximum swept area per rotor length, travel and rotation speed. After passing axially by the anti-rotation vanes, the pulp transversely passes more rotors and moves radially towards the mixer axis and completes its movement around the rotating member. The pulp is guided towards outlet pipes 57 by a back cone 76 and discharged.

Claims

1. An apparatus for mixing fluids and chemicals with a wood pulp having a consistency of 1-18% comprising, a housing, a pulp inlet attached to said housing, a circular disk within said housing having a front and back face wherein said front face is opposite said pulp inlet, means for rotating said circular disk, rotors attached to said front face of said circular disk having an axis extending perpendicular to the directon of rotation, rotors attached to said back face of said circular disk having an axis extending perpendicular to the direction of rotation, and a pair of juxtaposed pulp outlets attached to said housing, said pulp outlets positioned opposite said back face of said circular disk and adjacent to said rotating means, whereby said pulp enters said housing through said pulp inlet, passes transverse to said front face rotors wherein said front face rotors are rotating, travels around said circular disk, passes transverse to said back face rotors wherein said back face rotors are rotating, and leaves said housing through said pulp outlets.
2. A mixer as claimed in claim 1 wherein anti-rotation vanes are attached to said housing.
3. A mixer as claimed in claim 1 wherein stators are attached to said housing opposite said front face of said circular disk certain of said stators having means for fluid and chemical addition.
4. A mixer as claimed in claim 3 wherein said stators and said rotors are cincturally located.
5. A mixer as claimed in claim 1 wherein certain of said rotors have means for fluid and chemical addition.
PCT/US1986/000575 1985-07-22 1986-03-21 Double sided mixer WO1987000450A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US75758385A 1985-07-22 1985-07-22
US757,583 1985-07-22

Publications (1)

Publication Number Publication Date
WO1987000450A1 true WO1987000450A1 (en) 1987-01-29

Family

ID=25048396

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1986/000575 WO1987000450A1 (en) 1985-07-22 1986-03-21 Double sided mixer

Country Status (5)

Country Link
EP (1) EP0230427A1 (en)
AU (1) AU5586586A (en)
NZ (1) NZ216905A (en)
WO (1) WO1987000450A1 (en)
ZA (1) ZA864210B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6241852B1 (en) * 1993-10-13 2001-06-05 Kvaerner Pulping Ab Method and device for mixing of a fluid into a pulp-suspension at the lowest pressure of the suspension
US7384184B2 (en) * 2002-12-12 2008-06-10 Metso Paper, Inc. Apparatus for mixing a chemical medium with a pulp suspension
US7384185B2 (en) * 2002-12-12 2008-06-10 Metso Paper, Inc. Apparatus for mixing a chemical medium with a pulp suspension

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1624037A (en) * 1925-04-30 1927-04-12 Colloidal Equipment Corp Apparatus for deflocculating and emulsifying
US1711154A (en) * 1926-12-30 1929-04-30 Turbinator Company Inc Mixing and grinding device
US2441711A (en) * 1945-03-27 1948-05-18 United Dairy Equipment Company Apparatus for homogenizing mixed liquid ingredients
US2731253A (en) * 1951-10-04 1956-01-17 Firestone Tire & Rubber Co Rubber foam mixer
US3081069A (en) * 1959-09-14 1963-03-12 Et Oakes Corp Mixing apparatus
US4194843A (en) * 1979-04-13 1980-03-25 Martin Ernest N Mixer
US4283016A (en) * 1979-03-16 1981-08-11 Reinhall Rolf Bertil Method and apparatus for controlling the effect of the centrifugal force on the stock in pulp defibrating apparatus
US4303470A (en) * 1979-06-15 1981-12-01 Weyerhaeuser Company Method and apparatus for mixing gases with a wood pulp slurry
US4431482A (en) * 1980-11-25 1984-02-14 Escher Wyss Gmbh Dispersion apparatus for the preparation of waste paper
US4435085A (en) * 1982-08-06 1984-03-06 Ingersoll-Rand Company Mixer for use in pulp processes

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1624037A (en) * 1925-04-30 1927-04-12 Colloidal Equipment Corp Apparatus for deflocculating and emulsifying
US1711154A (en) * 1926-12-30 1929-04-30 Turbinator Company Inc Mixing and grinding device
US2441711A (en) * 1945-03-27 1948-05-18 United Dairy Equipment Company Apparatus for homogenizing mixed liquid ingredients
US2731253A (en) * 1951-10-04 1956-01-17 Firestone Tire & Rubber Co Rubber foam mixer
US3081069A (en) * 1959-09-14 1963-03-12 Et Oakes Corp Mixing apparatus
US4283016A (en) * 1979-03-16 1981-08-11 Reinhall Rolf Bertil Method and apparatus for controlling the effect of the centrifugal force on the stock in pulp defibrating apparatus
US4194843A (en) * 1979-04-13 1980-03-25 Martin Ernest N Mixer
US4303470A (en) * 1979-06-15 1981-12-01 Weyerhaeuser Company Method and apparatus for mixing gases with a wood pulp slurry
US4431482A (en) * 1980-11-25 1984-02-14 Escher Wyss Gmbh Dispersion apparatus for the preparation of waste paper
US4435085A (en) * 1982-08-06 1984-03-06 Ingersoll-Rand Company Mixer for use in pulp processes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6241852B1 (en) * 1993-10-13 2001-06-05 Kvaerner Pulping Ab Method and device for mixing of a fluid into a pulp-suspension at the lowest pressure of the suspension
US7384184B2 (en) * 2002-12-12 2008-06-10 Metso Paper, Inc. Apparatus for mixing a chemical medium with a pulp suspension
US7384185B2 (en) * 2002-12-12 2008-06-10 Metso Paper, Inc. Apparatus for mixing a chemical medium with a pulp suspension

Also Published As

Publication number Publication date
ZA864210B (en) 1987-10-28
EP0230427A1 (en) 1987-08-05
NZ216905A (en) 1987-10-30
AU5586586A (en) 1987-02-10

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