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WO1997038788A1 - Appareil de melange de milieux - Google Patents

Appareil de melange de milieux Download PDF

Info

Publication number
WO1997038788A1
WO1997038788A1 PCT/SE1996/000488 SE9600488W WO9738788A1 WO 1997038788 A1 WO1997038788 A1 WO 1997038788A1 SE 9600488 W SE9600488 W SE 9600488W WO 9738788 A1 WO9738788 A1 WO 9738788A1
Authority
WO
WIPO (PCT)
Prior art keywords
ofthe
rotor
housing
media
mixing
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.)
Ceased
Application number
PCT/SE1996/000488
Other languages
English (en)
Inventor
Kjell Nilsson
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.)
REGALCO ENGINEERING AB
Original Assignee
REGALCO ENGINEERING 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
Priority to SE9403617A priority Critical patent/SE503500C2/sv
Application filed by REGALCO ENGINEERING AB filed Critical REGALCO ENGINEERING AB
Priority to DE69618249T priority patent/DE69618249T2/de
Priority to PCT/SE1996/000488 priority patent/WO1997038788A1/fr
Priority to EP96920081A priority patent/EP0912235B1/fr
Publication of WO1997038788A1 publication Critical patent/WO1997038788A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B01F27/09—Stirrers characterised by the mounting of the stirrers with respect to the receptacle
    • B01F27/091—Stirrers characterised by the mounting of the stirrers with respect to the receptacle with elements co-operating with receptacle wall or bottom, e.g. for scraping the receptacle wall
    • 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
    • B01F27/95—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers having planetary motion, i.e. rotating about their own axis and about a sun axis
    • 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
    • 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
    • B01F27/13—Openwork frame or cage stirrers not provided for in other groups of this subclass
    • 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
    • B01F27/23—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis
    • B01F27/232—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis with two or more rotation axes
    • B01F27/2324—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis with two or more rotation axes planetary

Definitions

  • the present invention relates to a device for mixing of two or several media.
  • these kinds of devices are made as a type of vessel into which different media are fed and exposed to agitation by means of rotating or revolving stirrers. Usually the media are fed in continuously and the mixture is also discharged continuously. If the mixing takes place under high pressures the vessel has to be made as a pressure vessel and if the media are highly corrosive all parts, in contact with or exposed to the media, have to be made of materials resistive to corrosion.
  • the type of mixer is intended for use in ordinary mixing applications, when only a very effective degree of mixing is to be obtained, and also for very difficult applications in continuous processes with lignocellulosic material as media.
  • the mixer will be able to operate highly viscosic media, such as suspensions of lignocellulosic fibres in water, with a concentration of dry substance as high as approximately 35 %.
  • highly viscosic media such as suspensions of lignocellulosic fibres in water, with a concentration of dry substance as high as approximately 35 %.
  • cellulosic fibres have the ability to form a network unaided, a so called network of fibre, at relatively low consistencies. This leads to a rapid decrease in the mixtures ability to flow, like a "Newtonian hquid". If this phenomena cannot be overcome or eliminated it will strongly effect the result in a negative way when mixing additives like, bleaching chemicals, oxygen, acids, etc.
  • Acid hydrolysis of lignocellulosic materials can be used as an example. If a strong network of fibre exists, the added acid will not be distributed to the medium in an satisfactory way for this process.
  • the network of fibre should be broken so that all the individual fibres can be reached rapidly by the acid. This can be achieved by an agitation ofthe fibre suspension strong enough to fluidize the mixture.
  • the mixture will than start to behave like a "Newtonian liquid", which will allow a proper and homogeneous addition ofthe acid.
  • the transport ofthe mixture through the mixer will also be facilitated.
  • the mixer will also be constructed so that it can be equipped with an internal cover of special material, as a protection from corrosion, without being too complicated or in any other way leading to unreasonable costs.
  • the purpose ofthe invention is to achieve a mixer which is unsophisticated, effective and easy to facilitate, and which also complies with above mentioned requirements.
  • the housing ofthe mixer has a straight cylindrical form and the media, that should be mixed, are fed in through an opening in the mantle surface, essentially radial to the housing, where the media immediately in the opening are subject to a first mixing, or agitation, by the axial bars that sweep close to the inner wall ofthe cylindrical mixing housing.
  • the media are transported perpendicular to the intake direction and are subject to at least one more mixing or agitation, but now perpendicular to the first mixing, by a rotating rotor cross with radial arms located in the open -end ofthe mixing housing, coaxial with the housing. This especially contributes to a strong turbulence ofthe media mixture.
  • media could also be fed, through the mixing housing, in the other direction.
  • figure 1 is a side view ofthe device, partly in section, and figure 2 is an end view ofthe device.
  • the device consists of three main parts, namely one straight cylindrical mixing housing 1, one straight cylindrical bearing housing 2 and one electrical motor 3, positioned at the end ofthe bearing housing. These three parts are connected to each other by flanges.
  • a feed pipe 4 is welded at an opening 5 through the cylindrical wall 6 ofthe mixing housing.
  • a revolvable rotor 7 is arranged inside the mixing housing 1 .
  • the rotor has one rotor cross, with radial arms 8, at the outlet opening 9 ofthe housing 1 and a similar rotor cross 10 at the other end ofthe housing 1, and the ends ofthe arms 8 are connected to the ends ofthe arms ofthe rotor cross 10 by four axial bars 15 which sweep along the inside ofthe housing 1 when the rotor is rotating.
  • the rotor cross 10 is fixed to a shaft 11 which goes through an opening in the end wall 12 ofthe bearing housing 2. End wall 12 is also, at the same time, the end wall ofthe mixing housing 1.
  • the shaft 11 is supported by the bearings 13 in the bearing housing 2 and is connected to the motor 3 by a coupling 14.
  • the rotor cross 10 has arms which are somewhat inclined to feed the media from the end wall 12, as are the bars 15, to feed the media from the inside ofthe wall 6 against the centre ofthe housing 1. Furthermore the axial bars 15 can be designed slightly curved to support the feed ofthe media through the housing 1 forwards the outlet opening 9.
  • the arms 8, ofthe rotor cross in the outlet opening 9, are twisted and/or curved causing a strong turbulence when the media is passing.
  • one or several more rotor crosses can be arranged at the rotor 7 between the two which are shown in the drawing.
  • the axial part ofthe housing has a diameter of 350 mm and a length of 600 mm.
  • the inlet pipe 4 has a diameter of 325 mm.
  • the housing 1 and the inlet pipe 4 are made of stainless steel and the inside are lined with a 4 mm thick plate of Zirconium 16.
  • the rotor 7 is manufactured of solid Zirconium and the design gives the suitable stability and strength to take the full torque that the motor 3 can give.
  • This motor has an effect of 75 kW and a speed of 750 rpm, which gives the rotor a circumferential speed of 13,5 m/s.
  • the arms of the rotor crosses can be more or less than four.
  • the ends ofthe arms can be connected by a circular reinforcement if increased rigidity ofthe rotor is desired.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

La présente invention se rapporte à un appareil de mélange de deux milieux ou davantage, introduits dans cet appareil, comme des suspensions dans l'eau de fibres cellulosiques à la viscosité exceptionnellement élevée, par exemple, lors de l'hydrolyse de la cellulose. Selon l'invention, ce mélange s'effectue dans une enceinte de mélange (1), longitudinale, cylindrique, ouverte sur un côté, et dans laquelle les milieux sont introduits par une ouverture (5) ménagée dans la paroi cylindrique de l'enceinte (6), puis dirigés sur les côtés, à travers l'enceinte, contre l'ouverture (9) de décharge des milieux. Dans l'enceinte (1) on a placé un rotor coaxial (7) présentant deux éléments en croix, pourvus de bras radiaux, et entraînés par un moteur. On a placé le premier élément en croix (10) au niveau du pignon (12) et le second élément (8) au niveau de l'ouverture (9) de décharge des milieux, ces deux éléments, pourvus de bras radiaux, étant reliés l'un à l'autre au moyen de barres axiales (15) placées entre les éléments et effectuant un balayage le long de l'intérieur de l'enceinte cylindrique et de l'ouverture (5) d'introduction des milieux. De cette manière, les barres (15) du rotor et le second élément en croix (8) de celui-ci traitent les milieux respectivement au niveau de l'ouverture (5) d'introduction des milieux et au niveau de celle (9) de décharge de ceux-ci, dans deux directions perpendiculaires l'une à l'autre.
PCT/SE1996/000488 1994-10-21 1996-04-16 Appareil de melange de milieux Ceased WO1997038788A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
SE9403617A SE503500C2 (sv) 1994-10-21 1994-10-21 Anordning för blandning av två eller flera medier
DE69618249T DE69618249T2 (de) 1996-04-16 1996-04-16 Vorrichtung zum mischen von medien
PCT/SE1996/000488 WO1997038788A1 (fr) 1994-10-21 1996-04-16 Appareil de melange de milieux
EP96920081A EP0912235B1 (fr) 1996-04-16 1996-04-16 Appareil de melange de milieux

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9403617A SE503500C2 (sv) 1994-10-21 1994-10-21 Anordning för blandning av två eller flera medier
PCT/SE1996/000488 WO1997038788A1 (fr) 1994-10-21 1996-04-16 Appareil de melange de milieux

Publications (1)

Publication Number Publication Date
WO1997038788A1 true WO1997038788A1 (fr) 1997-10-23

Family

ID=26662156

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/000488 Ceased WO1997038788A1 (fr) 1994-10-21 1996-04-16 Appareil de melange de milieux

Country Status (2)

Country Link
SE (1) SE503500C2 (fr)
WO (1) WO1997038788A1 (fr)

Citations (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
DE4013912C2 (fr) * 1990-04-26 1992-04-02 Fischer Karl Ind Gmbh

Patent Citations (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
DE4013912C2 (fr) * 1990-04-26 1992-04-02 Fischer Karl Ind Gmbh

Also Published As

Publication number Publication date
SE503500C2 (sv) 1996-06-24
SE9403617D0 (sv) 1994-10-21
SE9403617L (sv) 1996-04-25

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