EP0578284B1 - Mixing apparatus for improving the treatment of fibre suspension - Google Patents

Mixing apparatus for improving the treatment of fibre suspension Download PDF

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Publication number
EP0578284B1
EP0578284B1 EP93114759A EP93114759A EP0578284B1 EP 0578284 B1 EP0578284 B1 EP 0578284B1 EP 93114759 A EP93114759 A EP 93114759A EP 93114759 A EP93114759 A EP 93114759A EP 0578284 B1 EP0578284 B1 EP 0578284B1
Authority
EP
European Patent Office
Prior art keywords
housing
chemicals
fluidizing
fibre suspension
opening
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
EP93114759A
Other languages
German (de)
French (fr)
Other versions
EP0578284A2 (en
EP0578284A3 (en
Inventor
Toivo Niskanen
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.)
Ahlstrom Corp
Original Assignee
Ahlstrom Corp
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 Ahlstrom Corp filed Critical Ahlstrom Corp
Publication of EP0578284A2 publication Critical patent/EP0578284A2/en
Publication of EP0578284A3 publication Critical patent/EP0578284A3/en
Application granted granted Critical
Publication of EP0578284B1 publication Critical patent/EP0578284B1/en
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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/53—Mixing liquids with solids using driven stirrers
    • 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
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector 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
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1126—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades the stirrer being a bent rod supported at one end only
    • 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
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1123—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades sickle-shaped, i.e. curved in at least one direction

Definitions

  • the present invention relates to a mixing apparatus for improving the treatment of fibre suspension.
  • the apparatus according to the invention is particularly suitable to be used for mixing chemicals into high consistency pulp in the pulp and paper industry.
  • Treating of high consistency pulp by means of making it flowable like water began in the late seventies when the so called fluidization was observed.
  • the first commercial devices utilizing this phenomenon were centrifugal pumps. These new type of high consistency pumps have become more popular in mills, and such a pump is described, for instance, in US-A-4 435 122.
  • High consistency pulp is fluidized in the pump, in other words changed into a flowing state just before the pulp reaches the range of the pump impeller.
  • High consistency pulp (consistency, 8-20%) is a very stiff material in its nature; depending on the consistency, it may be so stiff that one can stand on the pulp with ordinary shoes and not sink into the pulp. The reason for this is that fibres having a size of a few millimetres form a strong three-dimensional fibre network.
  • High consistency pulp may, however, be changed into a flowing state by breaking the fibre network by means of introducing shear forces into the suspension. This is called fluidization of high consistency pulp.
  • fluidization is effected by some kind of powerful rotor.
  • the rotor effects the fluidization in the suction duct of the pump.
  • the rotor is attached to the centrifugal impeller and extends centrally and axially in the inlet channel of the pump. Fluidization is a reversible process, and as soon as the rotor stops or the pulp is no longer in the range of the rotor, the fibre network is again formed and the suspension again becomes solid material.
  • a pump cannot be used as a mixer for several reasons. Such can be, for example, material problems or the fact that the amount or the quality of chemicals is such that the chemicals cannot be added into the pump. Therefore, one has to use a separate mixer. There are also applications in which part of the chemicals can be introduced into the pump and the rest into the mixer, or all chemicals into the mixer, depending on the situation.
  • the mixer comprises a substantially cylindrical rotor which has protrusions on its surface, a housing with an inlet opening and an outlet opening and protrusions on the inner surface thereof, and a feed duct for chemicals opening into the mixing zone between the rotor and the housing.
  • the object of the present invention is to provide an improved mixer for mixing chemicals into a fibre suspension flow in the pulp and paper industry.
  • the present invention discloses an apparatus for mixing chemicals into a fibre suspension flow.
  • the apparatus comprises a housing having a mixing chamber with an inlet opening, an outlet opening, and a special fluidizing rotor.
  • the arrangement utilizing the invention enables mixing of chemicals without the pump being the only place where such can be added. In many cases in bleaching processes, all the chemicals can be added in the mixer. Thus, the arrangement according to the prior art in which a mixer described in FI 68688 could well be used is essentially simplified, since the pump can be manufactured of cheaper material as the chemicals are added into the suspension after the pump.
  • Fig. 1 shows a schematical arrangement, for example, for mixing bleaching chemicals into a fiber suspension.
  • the arrangement is basically the same as described in the Finnish patent 77 905 (FI patent application 850854) .
  • the arrangement comprises a pulp tank 3, a pump 2, a level control valve 1 used for adjusting the amount of pulp discharged from the tank 3 and a mixer 7 following the valve 1 in the direction of pulp flow, which mixer can be similar to, for example, the fluidizing mixer shown in the Finnish patent specification 68688.
  • Drawbacks of the arrangement are a considerable overall loss of pressure of the devices especially with high consistency pulps and the costs of apparatus made of specific materials.
  • the apparatus 10 in accordance with the present invention is composed of a housing 13 with a so called mixing chamber having an inlet opening 14 and an outlet opening 16.
  • the housing is provided with yet another opening 24 for a shaft 21.
  • the shaft 21 is positioned substantially at a right angle to the centerline C L of the apparatus 10 i.e. the line running from the center of the inlet opening 14 to the center of the outlet opening 16, which is in the direction of pulp flow through the housing 13.
  • the shaft 21 has two ends, the first end being coupled to drive means (not shown) and the second end 25 extending into the housing 13 substantially flush with the wall of the mixing chamber.
  • a fluidizing rotor 22 is attached to said second end 25 of shaft 21 such that it extends inside the housing 13.
  • the fluidizing rotor 22 is formed with two members 26 extending towards the wall of the mixing chamber opposite to the shaft opening 24.
  • the members 26 are located spaced from their rotational axis such that they leave the center of the fluidizing rotor 22 open.
  • the purpose of the opening center is to ensure the pulp can flow through the apparatus even when the fluidizing rotor 22 is stopped.
  • the mixer housing 13 can also be provided with an opening 23 for introducing chemicals into the mixer. Said opening 23 is located either upstream of the fluidizing rotor 22 in the inlet opening area 14 or in the mixing chamber. Naturally, the chemicals may be introduced into the mixing chamber with the pulp flow.
  • the material being mixed does not need to be high consistency pulp, but the mixing is applicable also to dilute pulps .
  • the substances or chemicals to be mixed can be either gaseous, liquids or solids.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Taps Or Cocks (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Endoscopes (AREA)
  • Pyrrole Compounds (AREA)
  • Inorganic Fibers (AREA)

Abstract

The present invention relates to a mixing apparatus for improving the treatment of fibre suspension. The apparatus comprises a housing (13) for the fibre suspension flow having a mixing chamber with an inlet opening (14), an outlet opening (16), and a fluidizing rotor (22) arranged in the mixing chamber. The fluidizing rotor (22) is formed of a shaft (21) extending through the housing (13) substantially at a right angle to the fibre suspension flow therethrough and finger-like fluidizing members (26) attached to the end (25) of said shaft (21) in the housing (13). <IMAGE>

Description

  • The present invention relates to a mixing apparatus for improving the treatment of fibre suspension. The apparatus according to the invention is particularly suitable to be used for mixing chemicals into high consistency pulp in the pulp and paper industry.
  • Treating of high consistency pulp by means of making it flowable like water began in the late seventies when the so called fluidization was observed. The first commercial devices utilizing this phenomenon were centrifugal pumps. These new type of high consistency pumps have become more popular in mills, and such a pump is described, for instance, in US-A-4 435 122. High consistency pulp is fluidized in the pump, in other words changed into a flowing state just before the pulp reaches the range of the pump impeller. High consistency pulp (consistency, 8-20%) is a very stiff material in its nature; depending on the consistency, it may be so stiff that one can stand on the pulp with ordinary shoes and not sink into the pulp. The reason for this is that fibres having a size of a few millimetres form a strong three-dimensional fibre network. High consistency pulp may, however, be changed into a flowing state by breaking the fibre network by means of introducing shear forces into the suspension. This is called fluidization of high consistency pulp. Normally, fluidization is effected by some kind of powerful rotor. For example, in high consistency pumps the rotor effects the fluidization in the suction duct of the pump. In commercial centrifugal pumps, the rotor is attached to the centrifugal impeller and extends centrally and axially in the inlet channel of the pump. Fluidization is a reversible process, and as soon as the rotor stops or the pulp is no longer in the range of the rotor, the fibre network is again formed and the suspension again becomes solid material.
  • In pulp mills it is often necessary to mix chemicals into the pulp, for example in bleaching. This can be effected either in a fluidizing high consistency pump or in a separate mixer, cf. FI patent 77 905 (FI patent application 850854). When chemicals are mixed in a fluidizing high consistency pump, they are added either before the pump, for instance into the inlet channel thereof, or at the outer rim of the impeller. If this is done, a separate mixer is not necessary, but the same device serves both as a mixer and a pump.
  • Often a pump cannot be used as a mixer for several reasons. Such can be, for example, material problems or the fact that the amount or the quality of chemicals is such that the chemicals cannot be added into the pump. Therefore, one has to use a separate mixer. There are also applications in which part of the chemicals can be introduced into the pump and the rest into the mixer, or all chemicals into the mixer, depending on the situation.
  • An example of a fluidizing mixer is described, for example, in FI-patent publication 68688. The mixer comprises a substantially cylindrical rotor which has protrusions on its surface, a housing with an inlet opening and an outlet opening and protrusions on the inner surface thereof, and a feed duct for chemicals opening into the mixing zone between the rotor and the housing.
  • The object of the present invention is to provide an improved mixer for mixing chemicals into a fibre suspension flow in the pulp and paper industry.
  • This object is solved by the apparatus in accordance with the invention defined in claim 1. Advantageous embodiments are defined in the dependent claims.
  • The present invention discloses an apparatus for mixing chemicals into a fibre suspension flow. The apparatus comprises a housing having a mixing chamber with an inlet opening, an outlet opening, and a special fluidizing rotor.
  • Advantages of the present invention are discussed below with respect to the prior art.
    • The total pressure loss is diminished.
    • It is possible to raise the consistency level of the mixture up to a consistency of 25-30%. This is impossible with the earlier known devices.
  • The arrangement utilizing the invention enables mixing of chemicals without the pump being the only place where such can be added. In many cases in bleaching processes, all the chemicals can be added in the mixer. Thus, the arrangement according to the prior art in which a mixer described in FI 68688 could well be used is essentially simplified, since the pump can be manufactured of cheaper material as the chemicals are added into the suspension after the pump.
  • The apparatus according to the present invention is described in detail below by way of example with reference to the accompanying drawings, in which:
  • Fig. 1 is a schematic illustration of a mixing arrangement in accordance with the prior art.
  • Fig. 2 is a sectional side view of a mixer according to the present invention.
  • Fig. 3 is a fragmentary detail of a mixer according to Fig. 2 viewed from the incoming direction.
  • Fig. 1 shows a schematical arrangement, for example, for mixing bleaching chemicals into a fiber suspension. The arrangement is basically the same as described in the Finnish patent 77 905 (FI patent application 850854) . The arrangement comprises a pulp tank 3, a pump 2, a level control valve 1 used for adjusting the amount of pulp discharged from the tank 3 and a mixer 7 following the valve 1 in the direction of pulp flow, which mixer can be similar to, for example, the fluidizing mixer shown in the Finnish patent specification 68688. Drawbacks of the arrangement are a considerable overall loss of pressure of the devices especially with high consistency pulps and the costs of apparatus made of specific materials.
  • According to Fig. 2 and 3 the apparatus 10 in accordance with the present invention is composed of a housing 13 with a so called mixing chamber having an inlet opening 14 and an outlet opening 16. The housing is provided with yet another opening 24 for a shaft 21. The shaft 21 is positioned substantially at a right angle to the centerline CL of the apparatus 10 i.e. the line running from the center of the inlet opening 14 to the center of the outlet opening 16, which is in the direction of pulp flow through the housing 13. The shaft 21 has two ends, the first end being coupled to drive means (not shown) and the second end 25 extending into the housing 13 substantially flush with the wall of the mixing chamber. A fluidizing rotor 22 is attached to said second end 25 of shaft 21 such that it extends inside the housing 13. The fluidizing rotor 22 is formed with two members 26 extending towards the wall of the mixing chamber opposite to the shaft opening 24. The members 26 are located spaced from their rotational axis such that they leave the center of the fluidizing rotor 22 open. The purpose of the opening center is to ensure the pulp can flow through the apparatus even when the fluidizing rotor 22 is stopped. The mixer housing 13 can also be provided with an opening 23 for introducing chemicals into the mixer. Said opening 23 is located either upstream of the fluidizing rotor 22 in the inlet opening area 14 or in the mixing chamber. Naturally, the chemicals may be introduced into the mixing chamber with the pulp flow.
  • It is clear that the material being mixed does not need to be high consistency pulp, but the mixing is applicable also to dilute pulps . Similarly, the substances or chemicals to be mixed can be either gaseous, liquids or solids.

Claims (4)

  1. Apparatus for mixing chemicals into a fibre suspension flow, which apparatus comprises a housing (13) for the fibre suspension flow having a mixing chamber with an inlet opening (14), an outlet opening (16), and a fluidizing rotor (22) arranged in the mixing chamber, wherein said fluidizing rotor (22) is formed of a shaft (21) extending through the housing (13) substantially at a right angle to the fibre suspension flow therethrough and has fluidizing members (26) attached to the end (25) of said shaft (21) in the housing (13), said fluidizing rotor being built as illustrated in figures 2 and 3 of the drawings.
  2. Apparatus according to claim 1, characterized in that an opening (23) is arranged in the housing (13) for the introduction of chemicals therein.
  3. Apparatus according to claim 2, characterized in that the opening (23) for chemicals is arranged upstream of the fluidizing members (26).
  4. Apparatus according to claim 2, characterized in that the opening (23) for chemicals is arranged in the fluidization zone.
EP93114759A 1987-02-23 1988-02-22 Mixing apparatus for improving the treatment of fibre suspension Expired - Lifetime EP0578284B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI870747A FI82499C (en) 1987-02-23 1987-02-23 Device for improving regulation and treatment of fiber suspension flow
FI870747 1987-02-23
EP88102569A EP0280234B1 (en) 1987-02-23 1988-02-22 Method and apparatus for improving the treatment of fibre suspension and for the control of fibre suspension flow

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP88102569.6 Division 1988-02-22
EP88102569A Division EP0280234B1 (en) 1987-02-23 1988-02-22 Method and apparatus for improving the treatment of fibre suspension and for the control of fibre suspension flow

Publications (3)

Publication Number Publication Date
EP0578284A2 EP0578284A2 (en) 1994-01-12
EP0578284A3 EP0578284A3 (en) 1997-03-12
EP0578284B1 true EP0578284B1 (en) 1999-10-20

Family

ID=8523990

Family Applications (2)

Application Number Title Priority Date Filing Date
EP88102569A Expired - Lifetime EP0280234B1 (en) 1987-02-23 1988-02-22 Method and apparatus for improving the treatment of fibre suspension and for the control of fibre suspension flow
EP93114759A Expired - Lifetime EP0578284B1 (en) 1987-02-23 1988-02-22 Mixing apparatus for improving the treatment of fibre suspension

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP88102569A Expired - Lifetime EP0280234B1 (en) 1987-02-23 1988-02-22 Method and apparatus for improving the treatment of fibre suspension and for the control of fibre suspension flow

Country Status (7)

Country Link
EP (2) EP0280234B1 (en)
JP (1) JPS63288288A (en)
AT (2) ATE105884T1 (en)
CA (1) CA1313325C (en)
DE (3) DE280234T1 (en)
FI (1) FI82499C (en)
NO (1) NO178468B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT403063B (en) * 1995-04-12 1997-11-25 Andritz Patentverwaltung DEVICE FOR MIXING CHEMICALS IN A FIBROUS SUSPENSION
SE532643C2 (en) 2008-07-03 2010-03-09 Metso Paper Inc Method and apparatus for controlling pulp suspension flow
FR2997635A1 (en) * 2012-11-05 2014-05-09 Spcm Sa DEVICE FOR INJECTION THEN MIXING POLYMER IN A CANALIZATION TRANSPORTING SUSPENSION OF SOLID PARTICLES AND METHOD IMPLEMENTING THE DEVICE

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1066544B (en) * 1956-12-18 1959-10-08 Aschaffenburger Zellstoffwerke Device for mixing liquids with one another or with gases or mixtures of substances with different consistencies in a fixed, tubular housing with a rotating shaft
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
JPS6031554B2 (en) * 1976-12-28 1985-07-23 日産自動車株式会社 Coating method and equipment
US4199266A (en) * 1977-08-31 1980-04-22 Giusti Raolo B Processing vessels
DE3033240A1 (en) * 1980-09-04 1982-04-01 Wolfgang 4200 Oberhausen Riese Silo vehicle discharge ball valve - has plug of segmental shape avoiding flow resistance and formation of dead spaces
JPS6031554U (en) * 1983-08-09 1985-03-04 株式会社　不二工機製作所 valve
US4662394A (en) * 1985-10-25 1987-05-05 Johnston Pump/General Valve, Inc. Tight shut-off valve with flow control element

Also Published As

Publication number Publication date
FI870747A (en) 1988-08-24
CA1313325C (en) 1993-02-02
FI870747A0 (en) 1987-02-23
JPS63288288A (en) 1988-11-25
ATE105884T1 (en) 1994-06-15
NO178468B (en) 1995-12-27
DE3856373T2 (en) 2000-03-23
DE280234T1 (en) 1989-06-22
DE3889559D1 (en) 1994-06-23
EP0280234A3 (en) 1991-01-09
NO880758L (en) 1989-08-23
FI82499B (en) 1990-11-30
EP0280234A2 (en) 1988-08-31
JPH0240790B2 (en) 1990-09-13
FI82499C (en) 1992-07-14
NO880758D0 (en) 1988-02-22
EP0578284A2 (en) 1994-01-12
DE3856373D1 (en) 1999-11-25
EP0578284A3 (en) 1997-03-12
EP0280234B1 (en) 1994-05-18
DE3889559T2 (en) 1994-09-29
ATE185704T1 (en) 1999-11-15

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