EP0170995B1 - Mélangeur - Google Patents

Mélangeur Download PDF

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Publication number
EP0170995B1
EP0170995B1 EP85109386A EP85109386A EP0170995B1 EP 0170995 B1 EP0170995 B1 EP 0170995B1 EP 85109386 A EP85109386 A EP 85109386A EP 85109386 A EP85109386 A EP 85109386A EP 0170995 B1 EP0170995 B1 EP 0170995B1
Authority
EP
European Patent Office
Prior art keywords
mixing device
housing
mixing
movable element
conveying screw
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
Application number
EP85109386A
Other languages
German (de)
English (en)
Other versions
EP0170995A2 (fr
EP0170995A3 (en
Inventor
Gerhard Kratz
Helmut Walter
Eckhard Dipl.-Ing. Fischer
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0170995A2 publication Critical patent/EP0170995A2/fr
Publication of EP0170995A3 publication Critical patent/EP0170995A3/de
Application granted granted Critical
Publication of EP0170995B1 publication Critical patent/EP0170995B1/fr
Expired 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
    • 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
    • B01F27/192—Stirrers with two or more mixing elements mounted in sequence on the same axis with dissimilar elements
    • B01F27/1921—Stirrers with two or more mixing elements mounted in sequence on the same axis with dissimilar elements comprising helical elements and paddles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/10—Mixing in containers not actuated to effect the mixing
    • B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
    • B28C5/1238—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers for materials flowing continuously through the mixing device and with incorporated feeding or discharging devices
    • B28C5/1292—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers for materials flowing continuously through the mixing device and with incorporated feeding or discharging devices with rotating stirring and feeding or discharging means fixed on the same axis, e.g. in an inclined container fed at its lower part
    • 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
    • B01F33/80—Mixing plants; Combinations of mixers

Definitions

  • the invention relates to a mixing device for incorporating bio-harmful, in particular radioactive waste into a solidifying binder with a pre-mixer, a continuous mixer and a discharge pump.
  • the device of the type mentioned above which is known from DE-OS-3 202 518, has three spindles arranged at right angles to one another, some of which comprise a plurality of movable members and are each actuated by a separate drive motor.
  • the so-called continuous mixer shaft also serves as a discharge pump, because it extends from a screw conveyor, with which dry cement is fed, to an outlet opening.
  • the known device is complex, and not only the production is to be considered but also the operation. In particular, under radiation conditions in the treatment of radioactive waste, it is not possible to maintain and repair the device by access at any time.
  • the object of the invention is therefore to provide a device which is simpler and thus less susceptible to faults than the known device and with which the integration of bio-harmful wastes succeeds economically and reliably.
  • the pre-mixer, the continuous mixer and the discharge pump have rotating movable members which are joined along a common axis of rotation and are arranged in a tubular housing with at least predominantly vertical direction, on the upper end face of which there is a common drive motor that the movable member of the premixer is guided centrally in the housing and that the movable member of the discharge pump sits eccentrically and with play in the housing.
  • the invention is a significant simplification because only a single motor actuates the assembled movable members.
  • the problems associated with the redirection from one spindle to the other and the coordination of the support required for a defined end product are eliminated.
  • the vertical direction of the housing uses the force of gravity to support the mixture, including the premixing and the pumping action for discharge.
  • the mixing tool (as is usual with downflow mixers) constantly dips and dips out of the product and thereby grows from the inside due to product deposits. Rather, the movable member of the premixer guided in the housing achieves a cleaning effect in which the housing wall is constantly scratched free.
  • the movable member of the discharge pump which is arranged eccentrically and is designed accordingly, regardless of the mixing action. You can therefore get by with smaller forces. This simplifies the construction and also reduces the susceptibility to faults.
  • the new mixing device can also be cleaned well, with a rinse discharging adhering dirt downwards.
  • the movable member of the premixer can be designed, in particular, to be flexible and movably supported with respect to the discharge pump, as will be explained in more detail later on using the description of an exemplary embodiment. This reduces the build-up of incrustations and also wear. Nevertheless, a repair option is recommended in that the movable member of the discharge pump is coupled to the drive motor via a part which is rigid in the direction of rotation and which is designed to be divisible between the movable member of the continuous mixer and the drive motor.
  • the housing can advantageously be connected at an acute angle to a feed pipe whose end facing away from the housing lies next to the drive motor.
  • the feed pipe can run directly vertically, while the tubular housing has the inclination with respect to the vertical determined by the acute angle. In addition, this can reduce the overall height, as will be seen in more detail later.
  • the mixing tool consists of a center shaft with a mixing fork and an externally centric screw conveyor.
  • the mixing tool of the premixer comprises at least one rod which runs parallel to the inside of the tubular housing and projects into the area of the continuous mixer.
  • the rod acts as a scraper, which removes incrustations from the inside of the housing and compensates for unbalance caused by rotation of the mixing tool with little wear.
  • the mixing tool comprises a screw conveyor and that the rod protrudes through recesses in the screw conveyor.
  • the rod can be welded to the end of the screw conveyor facing the continuous mixer.
  • the aforementioned screw conveyor is advantageously a helically wound sheet metal strip, the width of which is as large as the inside diameter. It should be noted that the width of the sheet metal strip as the upper limit corresponds to the difference between the inside diameter of the mixer housing and the free space required by the pendulum movement of the drive shaft.
  • the screw conveyor is wound around a shaft, which is preferably rectangular in cross section, and is attached to it only at individual points. In particular, the screw conveyor is rigidly attached only to the uppermost passage on the enlarged head part of the shaft. This is advantageous because it is therefore a certain flexibility of the screw conveyor is achieved, which contracts depending on the load and therefore changes the outer diameter.
  • the head part is advantageously connected to the rest of the shaft via a detachable connection in order to be able to replace the components subject to wear at low cost.
  • the plant shown in Fig. 1 is located in a building 1 of the nuclear power plant, which ensures that only controlled access is possible.
  • the walls 2, 3, 4, etc. of building 1 are made of concrete and therefore provide the necessary shielding, since the system is used to incorporate radioactive waste, such as is generated by coolant cleaning, decontamination, etc. in a nuclear power plant.
  • radioactive waste such as is generated by coolant cleaning, decontamination, etc. in a nuclear power plant.
  • they are dried ion exchange resins, borates which have been thickened by evaporation and, if appropriate, further dried, but also contaminated solids, such as filter aids, which have been comminuted, combustion residues or the like.
  • a pump 6 feeds liquid waste, mixing water or other liquid binder components, as shown in FIG. 1, with its pressure line 7 into inlet ports 8A, 8B of two identical mixing devices 10A and 10B, which are arranged symmetrically to one another.
  • the devices 10A, 10B are fed with solid waste and binders from above via cellular wheel locks 11A and 11B, which are connected to a conveyor system 13 via slides 12A, 12B.
  • the conveyor system 13 comprises, for example, a worm 15 driven by a motor 14, with which the device 10A or 10B can be loaded, depending on the direction of rotation.
  • a connection 17A, 17B is provided on vertical feed pipes 16A, 16B for a ventilation system, with which exhaust gases are disposed of in a controlled manner.
  • the product produced with the devices 10A, 10B passes through an outlet hose 18A or 18B into drums 19 which are brought to a treadmill 21 by means of a treadmill 20, on which they pass to the Devices 10A, 10B are available. After filling, they can be transported to the exit using a treadmill 22.
  • each mixing device 10 comprises a tubular housing 25 with a diameter of, for example, 150 mm. It consists of three cylindrical sections 26, 27 and 28, which are connected to one another and to a geared motor 30 via flanges 29. Section 26 corresponds to the premixer, section 27 to the continuous mixer and section 28 to the discharge pump.
  • a feed pipe 31 is attached to the upper section 26 at an acute angle of, for example, 30 °, and its flange 32 can be used to connect it to the pipe 16 and to the rotary valve 11.
  • a nipple 33 is provided, on which the outlet hose 18 can be clamped.
  • the housing 25 contains the movable members of the mixing device 10 shown in FIGS. 3 to 6, which are connected to the geared motor 30 as a common drive via a coupling pin 35. It is a screw conveyor or mixing screw 36, a mixing fork 37 and a discharge spindle 38, which are joined along a common axis of rotation 39.
  • the screw conveyor 36 which serves as a pre-mixer, is formed by a sheet metal strip 40, which is for example 6 mm thick and forms a spindle with an outer diameter D of 130 mm corresponding to the inner diameter of the housing section 26, 27 (mixing tube) and an inner diameter d of 45 mm is wound around a rectangular shaft 41.
  • the rectangular shaft 41 is divided and detachably assembled with tabs 42 and screws 43.
  • the shaft 41 is only welded to the sheet metal strip 40 at the motor end on its narrow sides, i.e. in the area of the first two courses, as indicated in FIGS. 3 and 4 at 44 and 45.
  • a rod 48 with a square cross section extends with its outside to the circumference of the sheet metal strip 40, as shown in FIG. 5, so that it is installed parallel to the inside of the housing 25 runs.
  • the rod 48 acts as a scraper because the screw conveyor 36 is centered in the housing 25.
  • the axis 46 of the rod 48 has an eccentricity e of 8 mm at the end facing away from the motor, to which the lower end 49 of the sheet metal strip is welded at 50.
  • the sheet metal strip 40 reaches over the mixing fork 37, i.e. in the area of the continuous mixer.
  • the mixing fork 37 is at 51 with the rectangle shaft 41 rigidly connected. On a cross strut 53 of the mixing fork 37 there is a coupling pin 54, over which a corresponding counterpart of the discharge spindle 38 engages. Mixing fork 37 and discharge spindle 38, which sit with play in the housing sections 27 and 28, perform planetary movements which are given by the eccentricity e.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Processing Of Solid Wastes (AREA)
  • Accessories For Mixers (AREA)

Claims (11)

1. Dispositif mélangeur pour incorporer des déchets biologiquement nuisibles, notamment radioactifs, à un agent liant de solidification, comprenant un prémélangeur, un mélangeur continu et une pompe d'évacuation, caractérisé en ce que le prémélangeur (26), le mélangeur continu (27) et la pompe d'évacuation (28) ont des éléments mobiles tournants (36, 37, 38) qui sont assemblés le long d'un axe commun de rotation (39) et qui sont disposés dans une enveloppe tubulaire (25) qui a, d'une manière au moins prépondérante, une direction verticale et sur le côté frontal supérieur de laquelle est monté un arbre d'entraînement commun (30), en ce que l'élément mobile (36) du prémélangeur (26) est guidé de manière centrée dans l'enveloppe (25), et en ce que l'élément mobile (38) de la pompe d'évacuation est monté de manière excentrée et avec du jeu dans l'enveloppe (25).
2. Dispositif mélangeur suivant la revendication 1, caractérisé en ce que l'élément mobile (36) du prémélangeur (26) est constitué de manière flexible, et est supporté de manière à pouvoir se déplacer par rapport à l'élément mobile (38) de la pompe d'évacuation.
3. Dispositif mélangeur suivant la revendication 1 ou 2, caractérisé en ce que l'élément mobile (38) de la pompe d'évacuation (28) est accouplé au moteur d'entraînement (30) par une partie (41) qui est rigide dans le sens de la rotation et qui est constituée de manière à pouvoir être subdivisée entre l'élément mobile (37) du mélangeur continu (27) et le moteur d'entraînement (30).
4. Dispositif mélangeur suivant la revendication 1, 2 ou 3, caractérisé en ce que l'enveloppe (25) communique, suivant un angle aigu, avec un conduit d'amenée (16, 31), dont l'extrémité éloignée de l'enveloppe (25) est à côté du moteur d'entraînement (30).
5. Dispositif mélangeur suivant l'une des revendications 1 à 4, caractérisé en ce que le prémélangeur (26, 36) comprend un barreau (48) qui s'étend parallèlement au côté intérieur de l'enveloppe tubulaire (25) et qui pénètre dans la partie du mélangeur continu (27, 37).
6. Dispositif mélangeur suivant la revendication 3, caractérisé en ce que le prémélangeur (26) comporte une vis convoyeuse (36) et en ce que le barreau (48) passe dans des évidements (47) de la vis convoyeuse (36).
7. Dispositif mélangeur suivant la revendication 6, caractérisé en ce que le barreau (48) est soudé à l'extrémité (49) de la vis convoyeuse (36), qui est tournée vers le mélangeur continu (37).
8. Dispositif mélangeur suivant la revendication 5, 6 ou 7, caractérisé en ce que la vis convoyeuse (36) est une bande de tôle (40) enroulée en hélice et dont la largeur est à peu près aussi grande que le diamètre intérieur.
9. Dispositif mélangeur suivant la revendication 8, caractérisé en ce que la vis convoyeuse (36) est enroulée autour d'un arbre (41) de section transversale rectangulaire et est fixée à celui-ci seulement en des points individuels (44, 45).
10. Dispositif mélangeur suivant la revendication 9, caractérisé en ce que la vis convoyeuse (36) est fixée rigidement à l'arbre (41) seulement sur la spire la plus élevée.
11. Dispositif mélangeur suivant la revendication 3 ou 10, caractérisé en ce que le point de fixation est prévu sur la pièce de l'arbre (41) qui peut être subdivisé, qui est tournée vers le moteur (30).
EP85109386A 1984-08-09 1985-07-26 Mélangeur Expired EP0170995B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843429412 DE3429412A1 (de) 1984-08-09 1984-08-09 Mischvorrichtung
DE3429412 1984-08-09

Publications (3)

Publication Number Publication Date
EP0170995A2 EP0170995A2 (fr) 1986-02-12
EP0170995A3 EP0170995A3 (en) 1987-07-15
EP0170995B1 true EP0170995B1 (fr) 1989-10-25

Family

ID=6242736

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85109386A Expired EP0170995B1 (fr) 1984-08-09 1985-07-26 Mélangeur

Country Status (5)

Country Link
US (1) US4778277A (fr)
EP (1) EP0170995B1 (fr)
JP (1) JPH0679076B2 (fr)
DE (2) DE3429412A1 (fr)
ES (1) ES8706039A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5235098A (en) * 1987-06-23 1993-08-10 Basf K&F Corporation Method for preparing dodecahydro-3a,6,6,9a-tetramethylnaphtho[2,1-b]furan and novel haloethyl decalin derivatives
EP0521373B1 (fr) * 1987-06-23 1996-02-07 Givaudan-Roure (International) S.A. Procédé pour la préparation de docécahydro-3a,6,6,9a-tétraméthylnaphto(2,1-b)furanne
DE3809661C2 (de) * 1988-03-23 1999-02-18 Reburg Patentverwertungs Gmbh Vorrichtung zum kontinuierlichen Mischen eines Baustoffs
DE3930954C2 (de) * 1989-09-15 1995-07-13 Herfeld Gmbh & Co Kg Dr Mischvorrichtung
DE202004020257U1 (de) * 2004-12-28 2006-02-09 Knauf Pft Gmbh & Co.Kg Mischvorrichtung
US7513963B2 (en) * 2006-11-01 2009-04-07 United States Gypsum Company Method for wet mixing cementitious slurry for fiber-reinforced structural cement panels
US7524386B2 (en) * 2006-11-01 2009-04-28 United States Gypsum Company Method for wet mixing cementitious slurry for fiber-reinforced structural cement panels
US20080099133A1 (en) * 2006-11-01 2008-05-01 United States Gypsum Company Panel smoothing process and apparatus for forming a smooth continuous surface on fiber-reinforced structural cement panels
US7754052B2 (en) 2006-11-01 2010-07-13 United States Gypsum Company Process and apparatus for feeding cementitious slurry for fiber-reinforced structural cement panels
DE102011121203B3 (de) * 2011-12-16 2012-06-06 Westinghouse Electric Germany Gmbh Rührwerkzeug, Rührvorrichtung und deren Verwendung
EP2605248B1 (fr) * 2011-12-16 2015-09-30 Westinghouse Electric Germany GmbH Dispositif de malaxage pour mélanger des matériaux abrasifs chargés radioactivement
JP6754390B2 (ja) * 2018-05-09 2020-09-09 太平電業株式会社 遮蔽容器への放射性粒状廃樹脂の収納方法

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US896551A (en) * 1905-08-19 1908-08-18 Frederic Juergens Method of cooling soap.
US1506142A (en) * 1923-01-23 1924-08-26 Robert C Stubbs Apparatus for mixing concrete under pressure
US3186602A (en) * 1963-09-05 1965-06-01 Jos L Muscarelle Feeding apparatus for particulate material
DE1244723B (de) * 1965-05-12 1967-07-20 Karl Schlecht Dipl Ing Vorrichtung zum kontinuierlichen Mischen von trockenem Gut mit einer Fluessigkeit
US3380716A (en) * 1965-11-23 1968-04-30 Bakk Engineering Ice cream freezer scraper blade
DE7030803U (de) * 1970-08-17 1970-11-12 Dreyer Heinrich Wilhelm Schneckenfoerderer an vorrichtungen zum konservieren von getreidekoernern.
US3967815A (en) * 1974-08-27 1976-07-06 Backus James H Dustless mixing apparatus and method for combining materials
JPS52133172A (en) * 1976-04-30 1977-11-08 Kikkoman Shoyu Co Ltd Mixing and transferring device
US4201484A (en) * 1978-10-23 1980-05-06 Modern Maid Food Products, Inc. Continuous mixing apparatus
DE2911141A1 (de) * 1979-03-21 1980-09-25 Kraftwerk Union Ag Mehrwellige schneckenmaschine
DE3013280C2 (de) * 1980-04-05 1983-11-17 Mathis System-Technik Gmbh, 7801 Merdingen Vorrichtung zur insbesondere kontinuierlichen Herstellung von angemachtem Mörtel o.dgl.
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Also Published As

Publication number Publication date
ES546031A0 (es) 1987-06-01
DE3573964D1 (en) 1989-11-30
JPH0679076B2 (ja) 1994-10-05
JPS6147598A (ja) 1986-03-08
US4778277A (en) 1988-10-18
EP0170995A2 (fr) 1986-02-12
DE3429412A1 (de) 1986-02-20
ES8706039A1 (es) 1987-06-01
EP0170995A3 (en) 1987-07-15

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