US2764011A - Bleaching tower with mixing device - Google Patents

Bleaching tower with mixing device Download PDF

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Publication number
US2764011A
US2764011A US454686A US45468654A US2764011A US 2764011 A US2764011 A US 2764011A US 454686 A US454686 A US 454686A US 45468654 A US45468654 A US 45468654A US 2764011 A US2764011 A US 2764011A
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US
United States
Prior art keywords
pulp
tower
bleaching
inlet
disk
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
US454686A
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English (en)
Inventor
Richter Johan Christoffer Carl
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.)
Metso Fiber Karlstad AB
Original Assignee
Kamyr AB
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 Kamyr AB filed Critical Kamyr AB
Application granted granted Critical
Publication of US2764011A publication Critical patent/US2764011A/en
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    • 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
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/808—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers driven from the bottom of the receptacle
    • 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
    • B01F35/321—Disposition of the drive
    • B01F35/3213—Disposition of the drive at the lower side of the axis, e.g. driving the stirrer from the bottom of a receptacle
    • 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
    • B01F35/71—Feed mechanisms
    • B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
    • B01F35/71805—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings
    • 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
    • B01F35/75—Discharge mechanisms
    • B01F35/753—Discharging at the upper side of the receptacle, e.g. by pressurising the liquid in the receptacle or by centrifugal force
    • 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
    • B01F35/75—Discharge mechanisms
    • B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
    • B01F35/75455—Discharge mechanisms characterised by the means for discharging the components from the mixer using a rotary discharge means, e.g. a screw beneath the receptacle

Definitions

  • Said tendency often causes that the movement of the pulp is slowed down at certain parts of the cross section of the tower, so that the pulp runs through at an increased speed along a path of restricted cross section, or it may even cause the formation of bridges or plugs whereby the movement of the pulp is completely blocked.
  • the present invention is based thereupon that the applicant has recently found it possible to dispense with said screw press and to feed high density pulp against a considerable static pressure by means of pressure gas or air.
  • two problems are encountered, Viz. the problem of eliminating the tendency of unequal flow distribution, whereby the pulp moves in the centre of the tower but slows down along the walls of the tower, and the problem of simultaneously mixing the pulp with the bleaching agent in an effective manner.
  • the tower is provided with a disk rotary about a vertical axis, which disk wholly covers the central pulp inlet opening in the bottom of the tower and which together with the part of the tower bottom surrounding the inlet opening forms an annular passage for directing the pulp radially outwards, the under side of said disk having pins, obliqnely set blades or similar stirring members adapted to mix into the pulp a bleaching agent supplied at or before the inlet opening.
  • the pulp is forced towards the periphery of the tower and the upward directed feeding force will be better distributed over the whole cross section of 'the tower, and therefore the bottom portion of the tower ICC need not be shaped as pointed as has been necessary earlier.
  • the mixing effect will be particularly effective, as the rotary stirring members, which are located on different radial distances, move with different absolute speeds.
  • Fig. l being an elevation and vertical cross section of the tower and the mixing device
  • Fig. 2 being :a cross section of the mixing device shown on an enlarged scale.
  • l1 designates the bleaching tower, preferably consisting of concrete.
  • the tower is in the shape of a standing cylinder having a downwardly tapering conical or partly spherical portion 13 merging with a smooth bend into the substantially plane and horizontal bottom 15.
  • an inlet piece 17 is Inserted in the centre of the bottom. Said inlet is connected to the end of the tube 19. Pulp is forced through said tube by pressure air feed or by some other method affording a pressure suciently high to push the pulp up through the tower and over its overflow edge 21.
  • a rotary scraper 23 is arranged at the top of the tower in order to facilitate an even discharge of the pulp.
  • the inlet piece 17 In and above the inlet piece 17 is a rotor consisting of a horizontal disk 25 and a hub 26 therefor keyed to the upper end of of a vertical shaft 29. Said shaft is journalled in bearings 26, 28, is driven by a driving means 27, and passes through a sealing sleeve 31 positioned in the centre of the inlet piece 17. Keyed to the shaft 29 between said sleeve and the hub 26 is a second hub 30 which carries a number of stirring arms 35, 36. Said arms move in the part of the inlet piece 17 located immediately below the level of the upper face of the tower bottom.
  • the disk 25 and its hub 26 form the upper wall of an annular passage 33 being the extension of the upwardly directed tubular passage located around the sleeve 31. In said passage 33 the moving pulp is diverted to the sides and the pulp leaves the same between the periphery of the disk 25 and the tower bottom in a radially outward and mainly horizontal direction and with an even distribution all around the circumference.
  • stirring members 37, 38; 39 and 40 Attached to the hub 26 and to the under side of the disk 25 are a number of stirring members 37, 38; 39 and 40. These members are ⁇ located at different radial dis'A tances, so that their circular paths are offset, as clearly shown by the dot-dash-lines.
  • the stirring members may be shaped as pins, vanes, obliqnely set plates or blades, or similar, and may be present in a number depending upon the size of the disk, the pulp consistency, the capacity and the power consumption.
  • Similar stirring members 41, 42 are attached to the tower bottom and project in between the above-mentioned stirring members, so that the pulp alternately meets rotary and stationary stirring members.
  • the members 41, 42 are shaped as twisted blades, whereby the pulp is displaced also in the vertical direction in order to improve the stirring elfect.
  • the rotor has a step 43 opposite the end of the stirring member 41 towards which said member projects, thereby catching the pulp following along the under surface of the disk 25.
  • the bleaching agent which may be chlorine gas, is supplied through a conduit 45 debouching into the inlet piece 17 immediately below the path of the rotary stirrer 36.
  • the diameter of the disk is of the order of 0.2 to 0.5 of the maximum diameter of the tower.
  • the diameter of the disk preferably is between 1 and 2 meters.
  • the upper side of the disk is provided with an upwardly directed point 47, preferably formed approximately as a cone.
  • the rotary disk not only gives an even pulp flow through the tower but has also proved to serve eiciently as -a mixer.
  • Thespeed of the rotor is held between 100 and V3.01)11. -P ⁇ M
  • the .stirring 4pins or V,blades which preferably are set somewhat obliquely in order to whirl the pulp around, extend across the major part of the :annular .passage to Athe neighborhood :of the opposite r wall v'thereof 4and haven height orlength of @il to 0.3 meter.
  • Thisltime is --suflicient for a thoroughmixing
  • Vof the bleaching chemicals -with ⁇ the pulp AAn essential advantage ofthe above-described device lies therein that-.it effectively iprevents ⁇ a gaseous bleaching agent from rising in the .tower kbefore it lh-as been thoroughly mixed into andpartlylabsorbed by the pulp.
  • a con- ⁇ crete ⁇ tower having a main cylindrical ⁇ part andan ⁇ essentially'semi-spherical bottompart, a pulp inlet at the centre offsaid bottom part, means for ⁇ continuously fee'ding pulp upwardsthrough the tower, a rotary displace- -ment body located in and yabove said inlet forspreading the pulp supplied through the inlet radially outwards along the surface 0f said bottom part of -the"tower, vsaid rotary displacement body including a disc member positioned vWithin said ltower over ⁇ said inlet and spaced a distance therefrom, and vanes attachedto said disc and extending downwardly therefrom atleast half the distance between said disc and said bottom ⁇ part of said tower for 4agitating the -pulp simultaneously with the spreading thereof.
  • a cylindrical bleaching tower having a bottom wall with ian opening in Kthe center thereof, means for feeding pulp to said ytower through said central opening, and
  • mixing means positioned withinsaid vopening .for mixing saidfipulp with bleaching chemicals, 'said mixing means .comprising a rotatable horizontally disposeddisc posi- 4tioned within said ytower and spaced from the bottom 'wall thereof, ;a lvertical shaft ⁇ extending upwardlyv through said opening .and .carrying fsaidv disc, means-for .driving said .shaft to rotate said disc, La 'plurality of agit-ating membersiixed ⁇ to said disc and ⁇ extending Adownwardly therefrom .and terminating ,short 'of ⁇ said bottom wall, secondgroup of agitating members, means :to move said second group tof agitating .members 'by said shaft, ,said
  • a plantforbleaching'rcellulosic pulp a reaction tower having a bottom Wall, an annular, substantially :horizontally directed ,peripheral ,pulp inlet in the center of vsaidxbottom wall, tpassage means Vfor ⁇ supplying .pulp and bleachingichemicalsto :said tower through saidrpulp inletfmeans fordischargingbleached pulp 'fromthe'top Vof said tower, andiagitating means-positionedwithin.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
US454686A 1953-09-11 1954-09-08 Bleaching tower with mixing device Expired - Lifetime US2764011A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE814153A SE171624C1 (de) 1953-09-11 1953-09-11

Publications (1)

Publication Number Publication Date
US2764011A true US2764011A (en) 1956-09-25

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ID=20427189

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Application Number Title Priority Date Filing Date
US454686A Expired - Lifetime US2764011A (en) 1953-09-11 1954-09-08 Bleaching tower with mixing device

Country Status (4)

Country Link
US (1) US2764011A (de)
DE (1) DE1029220B (de)
FR (1) FR1107796A (de)
SE (1) SE171624C1 (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2990710A (en) * 1958-10-13 1961-07-04 Improved Machinery Inc Pulp bleaching apparatus
US3053068A (en) * 1957-08-21 1962-09-11 Sunds Verkst Er Aktiebolag Towers for bleaching pulp material, especially cellulose pulp
US3138947A (en) * 1958-10-18 1964-06-30 Kamyr Ab Device for continuous bleaching of cellulose
US3174313A (en) * 1960-02-02 1965-03-23 Dorr Oliver Inc Treatment tower for paper pulp
US3218040A (en) * 1963-08-12 1965-11-16 Kamyr Ab Mixing apparatus for the mixing of a bleaching agent into cellulosic pulp
US3298209A (en) * 1963-12-23 1967-01-17 Kamyr Ab Washing container
US4621507A (en) * 1984-04-02 1986-11-11 Kamyr Ab Distributing device for suspensions
US5015335A (en) * 1990-09-17 1991-05-14 Champion International Corporation Chlorine dioxide static distributor
WO1997049861A1 (en) * 1996-06-27 1997-12-31 Sunds Defibrator Industries Ab Distributing device for paper pulp
US20020129911A1 (en) * 2000-10-16 2002-09-19 Marcoccia Bruno S. Process and configuration for providing external upflow/internal downflow in a continuous digester
US20130098765A1 (en) * 2010-06-22 2013-04-25 Ferbur Limited Apparatus and a method for the dehydratation treatment of waste sludge

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE419603B (sv) * 1979-11-27 1981-08-17 Kamyr Ab Apparat for inblandning av behandlingsmedel i suspensioner
ATE33862T1 (de) * 1983-03-18 1988-05-15 Sunds Defibrator Reaktor zur durchfuehrung chemischer reaktionen mit abmessungsermaessigung der festen materialien.

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US155873A (en) * 1874-10-13 Improvement in washing-machines
US188470A (en) * 1877-03-20 Improvement in washing-machines
US2351492A (en) * 1940-01-15 1944-06-13 Cowles Co Method and apparatus for treating paper stock
US2383684A (en) * 1940-11-08 1945-08-28 Kamyr Ab Process of continuous alkali treatment of fibrous material
US2418547A (en) * 1943-03-17 1947-04-08 Cowles Co Method and apparatus for defibering paper stock
US2424726A (en) * 1944-12-28 1947-07-29 Wells Harold Donald Pulp beater and selector
US2672075A (en) * 1949-03-23 1954-03-16 Fraser Douglas Machine for treating paper mill waste

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB254130A (en) * 1925-08-07 1926-07-01 Emil Luscher An improved device for atomizing and mixing liquids and gases
US2431478A (en) * 1942-07-25 1947-11-25 Raymond P Hill Bleaching fibrous material

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US155873A (en) * 1874-10-13 Improvement in washing-machines
US188470A (en) * 1877-03-20 Improvement in washing-machines
US2351492A (en) * 1940-01-15 1944-06-13 Cowles Co Method and apparatus for treating paper stock
US2383684A (en) * 1940-11-08 1945-08-28 Kamyr Ab Process of continuous alkali treatment of fibrous material
US2418547A (en) * 1943-03-17 1947-04-08 Cowles Co Method and apparatus for defibering paper stock
US2424726A (en) * 1944-12-28 1947-07-29 Wells Harold Donald Pulp beater and selector
US2672075A (en) * 1949-03-23 1954-03-16 Fraser Douglas Machine for treating paper mill waste

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3053068A (en) * 1957-08-21 1962-09-11 Sunds Verkst Er Aktiebolag Towers for bleaching pulp material, especially cellulose pulp
US3053069A (en) * 1957-08-21 1962-09-11 Sunds Verkst Er Aktiebolag Towers for bleaching pulp material, especially cellulose pulp
US2990710A (en) * 1958-10-13 1961-07-04 Improved Machinery Inc Pulp bleaching apparatus
US3138947A (en) * 1958-10-18 1964-06-30 Kamyr Ab Device for continuous bleaching of cellulose
US3174313A (en) * 1960-02-02 1965-03-23 Dorr Oliver Inc Treatment tower for paper pulp
US3218040A (en) * 1963-08-12 1965-11-16 Kamyr Ab Mixing apparatus for the mixing of a bleaching agent into cellulosic pulp
US3298209A (en) * 1963-12-23 1967-01-17 Kamyr Ab Washing container
US4621507A (en) * 1984-04-02 1986-11-11 Kamyr Ab Distributing device for suspensions
US5015335A (en) * 1990-09-17 1991-05-14 Champion International Corporation Chlorine dioxide static distributor
WO1997049861A1 (en) * 1996-06-27 1997-12-31 Sunds Defibrator Industries Ab Distributing device for paper pulp
US6123121A (en) * 1996-06-27 2000-09-26 Valmet Fibertech Aktiebolag Distributing device for paper pulp
US20020129911A1 (en) * 2000-10-16 2002-09-19 Marcoccia Bruno S. Process and configuration for providing external upflow/internal downflow in a continuous digester
US20130098765A1 (en) * 2010-06-22 2013-04-25 Ferbur Limited Apparatus and a method for the dehydratation treatment of waste sludge
US9963370B2 (en) * 2010-06-22 2018-05-08 Ferbur Limited Apparatus and a method for the dehydratation treatment of waste sludge

Also Published As

Publication number Publication date
DE1029220B (de) 1958-04-30
SE171624C1 (de) 1960-06-07
FR1107796A (fr) 1956-01-05

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