EP0729780B1 - Anlage zum Mischen von Flüssigkeit und Feststoff - Google Patents

Anlage zum Mischen von Flüssigkeit und Feststoff Download PDF

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Publication number
EP0729780B1
EP0729780B1 EP96102635A EP96102635A EP0729780B1 EP 0729780 B1 EP0729780 B1 EP 0729780B1 EP 96102635 A EP96102635 A EP 96102635A EP 96102635 A EP96102635 A EP 96102635A EP 0729780 B1 EP0729780 B1 EP 0729780B1
Authority
EP
European Patent Office
Prior art keywords
mixing
installation according
liquid
inlet hopper
storage tank
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
EP96102635A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0729780A2 (de
EP0729780A3 (de
Inventor
Norbert Dr. Stehr
Dieter März
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.)
Draiswerke GmbH
Original Assignee
Draiswerke GmbH
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 Draiswerke GmbH filed Critical Draiswerke GmbH
Publication of EP0729780A2 publication Critical patent/EP0729780A2/de
Publication of EP0729780A3 publication Critical patent/EP0729780A3/de
Application granted granted Critical
Publication of EP0729780B1 publication Critical patent/EP0729780B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B01F23/56—Mixing liquids with solids by introducing solids in liquids, e.g. dispersing or dissolving
    • 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
    • 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
    • B01F23/59—Mixing systems, i.e. flow charts or diagrams
    • 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
    • B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
    • B01F25/51—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle in which the mixture is circulated through a set of tubes, e.g. with gradual introduction of a component into the circulating 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
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/25—Mixers with loose mixing elements, e.g. loose balls in 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
    • B01F35/7173—Feed mechanisms characterised by the means for feeding the components to the mixer using gravity, e.g. from a hopper
    • 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
    • B01F35/71775—Feed mechanisms characterised by the means for feeding the components to the mixer using helical screws
    • 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
    • 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
    • B01F27/114—Helically shaped stirrers, i.e. stirrers comprising a helically shaped band or helically shaped band sections
    • B01F27/1143—Helically shaped stirrers, i.e. stirrers comprising a helically shaped band or helically shaped band sections screw-shaped, e.g. worms

Definitions

  • the invention relates to a system for mixing a predetermined amount Liquid with a given amount of powdered solid.
  • WO 92/21436 describes a device for wetting and dispersing of powdery solid in liquids known to have a disk-shaped Has rotor in a dispersion chamber. On one side of the disk-shaped rotor is an inlet for the powdery solid and on the other side of the disc-shaped rotor the inlet for the Liquid provided. The combination of the powdery solid with the liquid takes place in a wetting space in the outer edge area the rotor disc. On the outer edge of the surrounding the rotor disc Wetting chamber is an outlet for the liquid-powder mixture. The supply of the liquid and the powdery solid takes place by suction using the high-speed rotor disc.
  • the pulverulent solid can come from an over the device arranged funnel and / or by means of a hose a sack, storage container or the like. be sucked in. From the magazine S ⁇ FW Journal Cosmetics Detergents Specialties, April 2, 1992, pages 2 to 4 it has also become known for this known device, to connect the outlet of the device to the liquid reservoir, so that the liquid is circulated through the device is and the solid is thereby concentrated in the liquid.
  • the suction of the powdery solid is proportionate difficult and of numerous influencing factors, for example the flow behavior of the powdery solid.
  • the invention is therefore based on the object of a system of the generic type To create kind that is so operable that one hand Dust and, on the other hand, pronounced agglomerate formation as far as possible be avoided.
  • a system with a recycling feed is also known from US-A-4 099 005.
  • the essence of the invention is that a batch of powdered, dust-prone solid and a batch of liquid are brought together quasi-continuously in such a way that the Liquid circulates several times, many times, and the solid concentrated over these multiple circulations concentrated in the liquid becomes.
  • the solid is metered, inevitably supplied.
  • the Solid and liquid are brought together in the feed pipe, so that there is already a pre-mixing. This will make the Formation of larger agglomerates avoided.
  • By the way of feeding the Solid matter is prevented from dusting.
  • the system shown in FIG. 1 has a storage container 1 on which is sufficient to hold a predetermined amount of liquid 2 Volume.
  • a storage container 1 In the storage container 1 is one of one Not shown drive drivable agitator 3 arranged.
  • a screw mixing machine 4 is provided, the main of which cylindrical housing 5 of a temperature jacket 6 with a Inlet 7 and an outlet 8 for a temperature control medium for heating or Cool is surrounded.
  • a mixing shaft 9 is arranged in the housing 5 via an upstream transmission 10 from a mixed drive motor 11 is drivable.
  • a feed pipe opens into its interior 12 13 a.
  • the mixing shaft 9 as a worm shaft a helical circumferential screw flight 14 is formed.
  • the housing 5 can also be equipped with a so-called clearing wheel be provided, which meshes with the screw flights 14 to ensure proper Transport of the materials to be mixed through the interior 12 to ensure in the direction of conveyance 15.
  • clearing wheels are known for example from DE-A-24 32 860 (corresponding to US-A-3 957 210).
  • the screw mixer 4 can instead of a single shaft machine also designed as a double worm machine with a clearing wheel be, which by its genre is inevitably promoting.
  • Mixing shaft 9 is followed by an intensive mixing section 17 in which the Mixing shaft 9 with short pin-like or strip-like mixing tools 18 is occupied, which attached to the inner wall 19 of the housing 5 Counter tools 20 are assigned.
  • the mixing tools 18 and the counter tools 20 are in alternating circles around the Center axis 21 of the mixing shaft 9 is arranged. The closer the distance to the Mixing tools 18 from adjacent in the direction of the central axis 21 Counter tools 20, the greater the dispersing effect.
  • a return conveyor 22 is provided, which is attached to the end of the mixing shaft 9
  • Pump feed wheel 23 includes the liquid 2 in a Conveys outlet channel 24 opening tangentially from the housing 5.
  • the Outlet channel 24 is connected to reservoir 1 via a return line 25 connected. If the mixing machine 4 is located directly above the storage container 1 is arranged, then naturally no return conveyor must be provided his.
  • the feed connector 13 consists of a lower flange flanged to the housing 5 and in the interior 12 opening, widening upwards funnel-shaped section 26 and an upper, approximately cylindrical Section 27.
  • a solid feed pipe 28 protrudes concentrically from above, into the free-flowing, powdery solids from at least one solids metering device 29 can be entered. These solids leak out a lower outlet opening 30 of the feed pipe 28 into the funnel-shaped Section 26 of the supply nozzle 13.
  • Slightly above this lower one Outlet opening 30 is a cylindrical section 27 of the feed connector 13 surrounding ring line 31 is provided, which by a Cross-section approximately C-shaped jacket 32 is formed with a ring shape.
  • the way bounded annular space 33 of the ring line 31 is connected to a liquid supply line 34 connected, which leads to the reservoir 1.
  • a liquid passage opening 35 is formed, for example in the form an adjustable gap. From the annular space 33 flows by means of a Pump 36 fed from the reservoir 1 through the feed line 34 Liquid 2 through the passage openings 35 into the cylindrical Section 27 of the feed connector 13. It runs there on the inner wall 37 of the cylindrical section 27 down into the funnel-shaped Section 26. The downward flowing solid 38 is thereby from the liquid 2 running off on the inner wall 37 is completely enveloped.
  • the Liquid 2 is the mixing machine 4 in the feed pipe 13 below Gravity fed.
  • the solids metering device 29 has a funnel 40 which either has a volume that holds the entire batch of solid 38 is sufficient or the predetermined amount of solid is fed continuously during a complete mixing cycle. To the Dosing accuracy of the solid dosing device 29 is not special high demands. The dosing device only has to do so be adjustable so that they the predetermined amount of powdered solid distributed over a predetermined period of time in the feed connector 13 enters.
  • the metering device 29 can be a volumetric pump Snail or a gravimetric conveying snail or a gravimetric have conveying belt conveyor. In the simplest and sufficient Execution is a volumetric conveying screw. Such metering devices are known and commercially available. Basically it is also sufficient if a setpoint is to be given for the unit of time Solid volume is adjustable.
  • a level measuring device is arranged, which is a non-contact has working level probe 41.
  • This probe 41 gives continuously fill level signals to an input 42 of a control device 43.
  • These signals are processed in the control device 43 in such a way that a minimum level 44 and a maximum level 45 corresponding control signal is generated, which via outputs 46, 47 for alternative or cumulative control of the drive motor 11 the mixing shaft 9 and / or a pump drive motor 48 is supplied.
  • the probe 41 reports that the minimum fill level 44 has not been reached, then either by controlling the drive motor 11, the speed the mixing shaft 9 and thus the throughput of the mixing machine 4 lowered or the speed of the drive motor 48 of the pump 36 and thus their output increases.
  • the probe 41 exceeded of the maximum fill level 45 in the feed pipe 13 reports, then is either the speed of the drive motor 11 and thus the throughput the mixer 4 increases or the speed of the drive motor 48 of the pump 36 and thus the fluid supply lowered.
  • Both Measures can also be taken at the same time.
  • V Blender V Solid + V Mixture'
  • V solid and V mixture denote the volume flow of solid and the volume flow of mixture of solid and liquid.
  • the throttle 51 is connected to an output 53 of the control device 43.
  • the throttle 51 is controlled at a predetermined high relining of the mixing machine 4 so that the minimum fill level 44 is not fallen below and the maximum fill level 45 is not exceeded, the pressure gauge 52 being used to monitor that a maximum permissible pressure in the System is not exceeded.
  • the setting is such that with a complete circulation the liquid 2 located in the storage container 1 by the mixing machine 4 and back to the reservoir 1 only a fraction of that Solid 38 to be added to liquid 2 is added.
  • the type of Solid 38 and liquid 2 and the desired homogeneity can two to ten rounds of liquid 2 until complete addition solids 38 may be appropriate. If a fineness of dispersion of Mixture is sought, then in many cases more than ten rounds required.
  • the term liquid also means the mixture formed during the circulation Liquid 2 and solids 38 comprises. A pure liquid 2 is only present at the beginning of the process. This is - as described - with Mixed solids 38 and thus forms a flowable liquid-solid mixture, which is also called liquid for the sake of simplicity becomes.
  • the agitator 3 in the storage container 1 is used in the storage container 1 to bring about a concentration balance, that is, for an even one Concentration of solid 38 in liquid 2 in the entire reservoir 1 to worry.
  • An eccentric screw pump or a can also be used as the mixing machine 4 standard mixers equipped with conveyors are used. It is essential that it has its own funding, ie the liquid 2 and the solid 38 gives a delivery pulse.
  • Such agitators 3 ' are known; for example, so-called spiral agitators, which in particular also has a pronounced pull-in effect in the area exert the surface of the liquid 2 on the latter.
  • the reservoir 1 ' is provided with a cover 54, in which a vent opening 55, is provided for example for a pendulum ventilation.
  • the feed connector 13 in the embodiment described in FIG. 1 is in the Lid 54 attached and ends above the liquid 2. It is so far arranged above the liquid 2 that he even after complete mixing of the entire solid 38 in the liquid 2 not in this Mixture immersed.
  • An operating device 56 is also provided, by means of which on the one hand, the delivery rate of the pump 36 by appropriate setting the speed of the pump drive motor 48 and on the other hand the Dosing capacity of the metering device 29 can be set.
  • the delivery rate of the pump 36 by appropriate setting the speed of the pump drive motor 48 and on the other hand the Dosing capacity of the metering device 29 can be set.
  • the mixing of liquid 2 and solid 38 takes place in this Connection only in the storage container 1 'by its Agitator 3 '; there is no dispersion here. For many Adequate mixing can, however, be used in applications become.
  • an agitator drive motor 57 the function of a mixed drive motor, which by means of a V-belt drive 58, the agitator shaft 59 of the mixer shaft Agitator 3 'drives.
  • the reservoir 1 'with agitator 3' is used for 2 not only as a storage container, but also as a mixing device.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Accessories For Mixers (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
EP96102635A 1995-03-03 1996-02-22 Anlage zum Mischen von Flüssigkeit und Feststoff Expired - Lifetime EP0729780B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19507366A DE19507366A1 (de) 1995-03-03 1995-03-03 Anlage zum Mischen von Flüssigkeit und Feststoff
DE19507366 1995-03-03

Publications (3)

Publication Number Publication Date
EP0729780A2 EP0729780A2 (de) 1996-09-04
EP0729780A3 EP0729780A3 (de) 1997-01-08
EP0729780B1 true EP0729780B1 (de) 2000-10-18

Family

ID=7755488

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96102635A Expired - Lifetime EP0729780B1 (de) 1995-03-03 1996-02-22 Anlage zum Mischen von Flüssigkeit und Feststoff

Country Status (7)

Country Link
US (1) US5634715A (enrdf_load_stackoverflow)
EP (1) EP0729780B1 (enrdf_load_stackoverflow)
JP (1) JPH08266880A (enrdf_load_stackoverflow)
KR (1) KR100414878B1 (enrdf_load_stackoverflow)
CN (1) CN1088393C (enrdf_load_stackoverflow)
DE (2) DE19507366A1 (enrdf_load_stackoverflow)
IN (1) IN187138B (enrdf_load_stackoverflow)

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Also Published As

Publication number Publication date
DE59605996D1 (de) 2000-11-23
KR960033507A (ko) 1996-10-22
DE19507366A1 (de) 1996-09-05
KR100414878B1 (ko) 2004-04-03
EP0729780A2 (de) 1996-09-04
US5634715A (en) 1997-06-03
CN1088393C (zh) 2002-07-31
EP0729780A3 (de) 1997-01-08
IN187138B (enrdf_load_stackoverflow) 2002-02-09
JPH08266880A (ja) 1996-10-15
CN1142411A (zh) 1997-02-12

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