EP0111294B1 - Silo-mélangeur pour l'homogénéisation pneumatique de matières granuleuses et pulvérulentes - Google Patents

Silo-mélangeur pour l'homogénéisation pneumatique de matières granuleuses et pulvérulentes Download PDF

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Publication number
EP0111294B1
EP0111294B1 EP83112262A EP83112262A EP0111294B1 EP 0111294 B1 EP0111294 B1 EP 0111294B1 EP 83112262 A EP83112262 A EP 83112262A EP 83112262 A EP83112262 A EP 83112262A EP 0111294 B1 EP0111294 B1 EP 0111294B1
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EP
European Patent Office
Prior art keywords
silo
ventilated
zone
ventilation
zones
Prior art date
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Expired
Application number
EP83112262A
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German (de)
English (en)
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EP0111294A3 (en
EP0111294A2 (fr
Inventor
Werner Dipl.-Ing. Krauss
Heinrich Dipl.-Ing. Vogt
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.)
Claudius Peters AG
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Claudius Peters AG
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Publication date
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Application filed by Claudius Peters AG filed Critical Claudius Peters AG
Publication of EP0111294A2 publication Critical patent/EP0111294A2/fr
Publication of EP0111294A3 publication Critical patent/EP0111294A3/de
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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
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/40—Mixers using gas or liquid agitation, e.g. with air supply tubes
    • B01F33/406—Mixers using gas or liquid agitation, e.g. with air supply tubes in receptacles with gas supply only at the bottom
    • B01F33/4062—Mixers using gas or liquid agitation, e.g. with air supply tubes in receptacles with gas supply only at the bottom with means for modifying the gas pressure or for supplying gas at different pressures or in different volumes at different parts of the bottom

Definitions

  • the invention relates to a mixing silo for pneumatic homogenization of fine-grained or dusty material, the bottom of which alternately has pressurized groups of ventilation zones which can be operated in such a way that in each group a floor zone partially delimited by the outer silo floor boundary is strong and one between the strong ones ventilated soil zones is only weakly ventilated soil zone, and the outlet of which is arranged outside the silo floor.
  • Pneumatic homogenization is a high-quality mixing process in which the bulk material contained in a silo that is fluidized by aeration is circulated by allowing it to rise above a heavily ventilated soil zone and to sink over another, less aerated soil zone (DE-AS 1 138 608 ). Since homogenizing silos, which are set up to circulate the entire silo content, have a very high energy requirement, mixing chamber silos (DE-AS 15 07 888) are often preferred in connection with upstream mixing bed devices, whereby the long-term compositional compensation of the silos is primarily based on gravity mixing. However, mixed bed facilities are also very complex.
  • the homogenizer silo has therefore been taken up again and attempts have been made to reduce its energy requirement by not constantly mixing the entire silo content, but only parts of the same.
  • a central soil zone is constantly heavily ventilated, while from the ring of the surrounding sectors two opposing sectors are alternately weakly aerated, while the other sectors are not aerated (DE-AS 2 108 418).
  • a substantial amount of energy can be saved in this way, but the good circulation and thus the mixing effect leaves something to be desired.
  • the invention has for its object to provide a silo of the type mentioned, which delivers a good homogenization with little energy.
  • the solution according to the invention is that the only weakly ventilated bottom zone separates the strongly ventilatable bottom zones from one another and that the outlet is designed as an overflow.
  • the highly aerated soil zone is wherever it is not delimited by the silo wall, from weakly aerated areas on all sides Surrounding ground zones.
  • the space above it, in which the material moves due to the ventilation is not disc-shaped, but compact in horizontal cross-section.
  • the horizontal paths that the material has to cover from the poorly ventilated areas to the heavily ventilated area are comparatively short.
  • this movement does not have to overcome the frictional resistance from dead masses that limit the moving space volume on both sides.
  • the invention has the advantage that the loosening air is not lost through the crop outlet opening near the ground, where the already critical horizontal movement from the poorly ventilated to the heavily ventilated zone takes place.
  • an overflow is provided for the removal of the material, but an overflow is provided in the area of each zone to be heavily ventilated so that the material can be drawn off continuously during the mixed operation, namely in each case from the overflow which lies over a highly ventilated zone.
  • the overflow arrangement also ensures that only mixed goods reach the outlet. A short circuit does not take place between the newly added material to be mixed and the outlet, because the material lifted to the surface of the material above the heavily ventilated zone flows down to the side of the weakly or non-aerated zones and also the freshly added material from the outlet directed away, takes away.
  • the material to be mixed can be fed in centrally.
  • Known distribution devices can be provided for the purpose of more uniform distribution over the discharge cross section.
  • the ratio of filling height to diameter of the silo space is expediently between 1 and 1.5, as is known from conventional homogenization silos that are to be fully fluidized.
  • the heavily and weakly ventilated quadrants are usually exchanged in circulation, the cycle time being of the order of 15 minutes.
  • a shorter cycle time which should not be longer than 10, preferably not longer than 6 minutes, is expediently chosen in the homogenizing silo according to the invention, in order to ensure that the goods located in the vicinity of the respectively poorly ventilated zone are still sufficiently mobile to to be able to join the lowering movement.
  • the Silo part 4 designed according to the invention with cylindrical walls 5 and bottom 6, which is covered with ventilation devices 7.
  • the bottom 6 is slightly inclined towards the center, where there is an outlet opening 5 for emptying the mixing silo 4 into the storage silo 1.
  • the outlet opening 5 is closed during normal operation.
  • the material to be mixed can be fed to the mixing silo 4 through a central opening 9 in the ceiling 10, which is optionally connected to a baffle plate 11 for better distribution.
  • a filter 12 with a suction fan 13 for extracting the loosening air is arranged on the silo ceiling 10.
  • the ventilation devices 7 of the silo floor are arranged in the form of four quadrant-shaped ventilation fields, each of which forms one of the groups mentioned above. They are each divided into a zone 14 to be strongly ventilated and a zone 15 to be ventilated less, which are separated from one another in the field at the bottom right by different hatching. Zone 14, which is to be strongly ventilated, projects from the circumference into the respective ventilation field. In the two fields shown in the lower half of the illustration, it has an approximately triangular shape, while the two upper fields show an alternative design with an approximately semicircular shape.
  • the zone to be poorly ventilated surrounds the zone to be ventilated strongly on its side facing the center or the other fields.
  • the ratio of the area sizes of the heavily and weakly ventilated zones is in the order of about 1: 2 to 1: 4.
  • the zones 14 of each ventilation field which are to be strongly ventilated are connected via lines 16 with solenoid valves 17 and via a line 15 to a first blower 19, while the zones 15 of each field which are to be ventilated less are connected via lines 20 and 21 and solenoid valves 22 to a second blower 23 are.
  • the blower 19 is designed for the air requirement in each case of a zone 14 which is to be strongly ventilated, the blower 23 for the zone 15 which is poorly ventilated.
  • the solenoid valves are timed so that only zones 14, 15 of an aeration field are in operation, for a period of, for example, 5 minutes. Then they are switched so that each ventilation field is activated all around or alternately in a different order.
  • each zone 14 to be strongly ventilated there is a vertical overflow pipe 24 near the silo wall 5, the inlet mouth of which is at the desired fill level for fluidized material.
  • the overflow pipes 24 can be provided with closure members which are controlled in accordance with the change of the ventilation fields. However, this is generally not necessary because - as indicated in Fig. 2 - the level above the highly ventilated zone is higher than that above the other zones, so that only here the opening 25 of the overflow pipe 24 is reached while the openings of the other overflow pipes are higher. While, as indicated in FIG. 2, the material flows downward in the overflow pipe 24 assigned to the ventilation field currently in operation, the other overflow pipes allow the counterflow of air from the storage silo 1 into the upper space of the mixing silo 4.
  • a circulation flow is formed in the region 26 upwards and in the region 27 downwards, because regions 25 from the material above neighboring ventilation fields are included in the region 27 of the sinking material.
  • the boundary line between the bulk material in circulation and the material not covered by the circulation runs upwards at an angle of approximately 10-15 ° with respect to the vertical from the limits of the ventilation zones.
  • the expansion of the material over the heavily ventilated zone causes homogenized material to flow over the surface of the non-ventilated quadrants from the active quadrant in each case.
  • the silo according to the invention can be operated continuously and still be dimensioned to be large enough to compensate for long-term compositional fluctuations required period of time, for example 5 hours.
  • the silo according to the invention is also low-maintenance because on the one hand it is simple in construction and on the other hand the effort for control and transport devices is low.
  • the ventilation in the quadrants that are not in operation is generally switched off completely. However, in special cases, it can also be useful weakly ventilated, but so much weaker than even the weakly ventilated zones of the quadrant currently in operation that they can be regarded as not ventilated with regard to the circulation function.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Storage Of Harvested Produce (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)

Claims (5)

1. Silo mélangeur pour l'homogéneisation pneumatique de matières granulaires fines ou pulverulentes, silo dont le fond (6) présente des groupes de zones d'aérage (14, 15) qui peuvent être alimentés de manière variable en air comprimé et qui peuvent être exploités de telle manière que, dans chaque groupe, une zone du fond (14), délimitée en partie par la limite extérieure (5) du fond du silo soit fortement aérée et une zone du fond (15), située entre les zones du fond fortement aérables (14), soit faiblement aérée de façon exclusive, et dont la decharge est disposée à l'extérieur du fond du silo, caractérisé en ce que la zone du fond (15) qui est faiblement aérable de façon exclusive sépare entre elles en forme d'étoile les zones du fond (14) fortement aérables (14), et en ce que la décharge est réalisée sous forme de déversoir (25).
2. Silo selon la revendication 1, caractérisé en ce qu'un déversoir (25) est prévu au-dessus de chaque zone du fond (14) fortement aérable.
3. Silo selon la revendication 1 ou 2, caractérisé en ce que le rapport de la hauteur de remplissage au diamètre de la chambre du silo se situe entre 0,7 et 1,5.
4. Silo selon l'une quelconque des revendications 1 à 3, caractérisé par une alimentation centrale en matières à mélanger.
5. Silo selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le temps de cycle de la commutation de l'aérage d'une zone d'aérage à la suivante n'est pas supérieur à 10 mn, en particulier pas superieur à 6 mn.
EP83112262A 1982-12-09 1983-12-06 Silo-mélangeur pour l'homogénéisation pneumatique de matières granuleuses et pulvérulentes Expired EP0111294B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3245542 1982-12-09
DE19823245542 DE3245542A1 (de) 1982-12-09 1982-12-09 Mischsilo

Publications (3)

Publication Number Publication Date
EP0111294A2 EP0111294A2 (fr) 1984-06-20
EP0111294A3 EP0111294A3 (en) 1985-07-03
EP0111294B1 true EP0111294B1 (fr) 1987-08-12

Family

ID=6180198

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83112262A Expired EP0111294B1 (fr) 1982-12-09 1983-12-06 Silo-mélangeur pour l'homogénéisation pneumatique de matières granuleuses et pulvérulentes

Country Status (6)

Country Link
US (1) US4542991A (fr)
EP (1) EP0111294B1 (fr)
BR (1) BR8306783A (fr)
DE (2) DE3245542A1 (fr)
DK (1) DK157835C (fr)
ES (1) ES284574Y (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3516014A1 (de) * 1985-05-03 1986-11-06 Claudius Peters Ag, 2000 Hamburg Misch- und lagersilo
US4834544A (en) * 1987-07-06 1989-05-30 Fuller Company Fines separation system for pellet blender
US6138377A (en) * 1999-07-21 2000-10-31 United States Gypsum Company Apparatus and process for cooling and de-steaming calcined stucco
GB2384161A (en) * 2001-12-04 2003-07-23 Powder Conditioning Ltd Conditioning powders
DE10308722A1 (de) * 2003-02-28 2004-09-09 Degussa Ag Homogenisierung von nanoskaligen Pulvern
US7275856B2 (en) * 2004-09-30 2007-10-02 Rohm And Haas Electronic Materials Cmp Holdings, Inc. Apparatus for forming a polishing pad having a reduced striations
EP1897829B1 (fr) * 2006-09-08 2008-07-30 IBAU HAMBURG Ingenieurgesellschaft Industriebau mbH Méthode et système pour le remplissage de silos de stockage avec des matières en vrac fluidisées

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD61194A (fr) *
DE1027966B (de) * 1953-07-29 1958-04-10 Peters Ag Claudius Verfahren zum Mischen und Homogenisieren trockener pulveriger Stoffe auf teilweise pneumatischem Wege
DE1152876B (de) * 1958-05-20 1963-08-14 Fuller Co Verfahren und Vorrichtung zum Konditionieren, insbesondere Durchmischen von pulverfoermigem Material
DE1138608B (de) * 1960-09-07 1962-10-25 Peters Ag Claudius Verfahren und Einrichtung zum pneumatischen Mischen von staub-foermigem oder feinkoernigem trockenem Gut
FR1325873A (fr) * 1962-03-26 1963-05-03 Shell Int Research Procédé de mélange de matières en poudre
DE1906018A1 (de) * 1969-02-07 1970-09-03 Peters Ag Claudius Verfahren zum pneumatischen Mischen von staubfoermigem oder feinkoernigem Gut
GB1269756A (en) * 1969-08-28 1972-04-06 Polysius Ag A method for the continuous pneumatic treatment of fine material
US3653639A (en) * 1971-02-04 1972-04-04 Whirl Air Flow Corp High pressure air and liquid blending method and apparatus for discrete materials
DE2108418C3 (de) * 1971-02-22 1975-07-03 Polysius Ag, 4723 Neubeckum Verfahren zum pneumatischen Mischen und Homogenisieren
DE2223550A1 (de) * 1972-05-15 1973-12-06 Hans-Joachim Dipl-Ing Selig Querstromboden fuer homogenisierung rieselfaehiger schuettgueter
FR2261804A1 (en) * 1974-02-26 1975-09-19 Daloz Ets Homogenising dry powders in fluidised bed mixer - with several different fluidising conditions in adjacent sectors of the bed
DE2436414C2 (de) * 1974-07-29 1975-11-06 Claudius Peters Ag, 2000 Hamburg Verfahren zum Betrieb einer Vorrichtung zum Mischen von Schüttgut
FR2374073A1 (fr) * 1976-12-18 1978-07-13 Peters Ag Claudius Silo a chambre de melange pour matieres en vrac
US4375335A (en) * 1977-06-30 1983-03-01 Klein Albenhausen Heinrich Silo combination for mixing stored material
DE2949791A1 (de) * 1979-12-11 1981-06-19 Krupp Polysius Ag, 4720 Beckum Vorrats- und mischsilo fuer schuettgut
DE3026472C2 (de) * 1980-07-12 1983-04-21 Claudius Peters Ag, 2000 Hamburg Verfahren zum Betrieb eines Schüttgutsilos
DE3143387A1 (de) * 1981-11-02 1983-05-11 Krupp Polysius Ag, 4720 Beckum Verfahren zum betrieb eines durchlaufmischsilos

Also Published As

Publication number Publication date
EP0111294A3 (en) 1985-07-03
DE3372925D1 (en) 1987-09-17
DK564683A (da) 1984-06-10
DK157835C (da) 1990-08-06
BR8306783A (pt) 1984-07-17
US4542991A (en) 1985-09-24
ES284574U (es) 1985-07-01
EP0111294A2 (fr) 1984-06-20
DK564683D0 (da) 1983-12-08
DK157835B (da) 1990-02-26
DE3245542A1 (de) 1984-06-14
ES284574Y (es) 1986-04-01

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