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EP0855941B1 - Dispositif et appareil de tri et de separation de particules dans un procede de broyage de cereales - Google Patents

Dispositif et appareil de tri et de separation de particules dans un procede de broyage de cereales Download PDF

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Publication number
EP0855941B1
EP0855941B1 EP96934686A EP96934686A EP0855941B1 EP 0855941 B1 EP0855941 B1 EP 0855941B1 EP 96934686 A EP96934686 A EP 96934686A EP 96934686 A EP96934686 A EP 96934686A EP 0855941 B1 EP0855941 B1 EP 0855941B1
Authority
EP
European Patent Office
Prior art keywords
particles
fluidizing bed
bed
separation
screen deck
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
EP96934686A
Other languages
German (de)
English (en)
Other versions
EP0855941A1 (fr
Inventor
P. Siegismund Schneider
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.)
Ocrim SpA
Original Assignee
Ocrim SpA
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Filing date
Publication date
Application filed by Ocrim SpA filed Critical Ocrim SpA
Publication of EP0855941A1 publication Critical patent/EP0855941A1/fr
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Anticipated expiration legal-status Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/06—Feeding or discharging arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets

Definitions

  • the invention relates to a device and apparatus for classification and separation of particles in cereal milling process.
  • the separation of particles is separation of bran and germ particles from endosperm particles, which are obtained milling wheat.
  • the final product is for example flour and/or semolina.
  • wheat is ground on roller mills which simultaneously remove outer bran layers and germ from the wheat berry.
  • the ground stock leaving the roller mills is typically sifted to remove flour, as well as sorted to specific granulation ranges for either further processing on subsequent roller mills, or classification of endosperm particles with simultaneous removal of bran and germ particles.
  • the latter classification and separation is commonly referred to as “purification", employing an apparatus called “purifier”.
  • a known purifier apparatus comprises vibration means, a screen deck, for sieving the particles, and a plurality of second vacuum chambers arranged above the screen deck to achieve a laminar air flow and to permit operation with selective air velocities between individual vacuum chamber sections. So the particles are divided into three parts: one part passing through the screen deck, a second part lifted by the laminar upward directed air flow and a third part, made of the heavier and larger particles which cannot pass through the screen deck and cannot be lifted.
  • DE-U-93 07 072 describes a screening device according to the preamble of claim 1, in which the majority of a bulk material stream passes through a screen deck, leaving only foreign materials, such as metal parts or material lumps, as residuals.
  • the objective is to reduce the required screening surface for separation purposes of latter parts. This device is not compatible to the aims of the present invention.
  • EP-A-0 081 087 describes a ground raw coal separator for the separation of a bulk material consisting of a fine and coarse particle first component of lower specific gravity and at least one other component of higher specific gravity. This device is not compatible to the aims of the present invention.
  • the above two documents comprise a fluidized bed, followed by a screen deck, but do not have an independent vacuum air source and a plurality of vacuum chambers, and necessary means of air flow adjustments, to facilitate separation of low density bran and germ particles.
  • EP-A-0 427 679 describes a concentrator for whole grains, that has suction air flow for fluidization of whole grains and drop-through screening. Under the drop-through zone there is arranged an improved screen deck, provided with a secondary diffuser deck. This device is not compatible to the aims of the present invention and does not have a compressed air source to facilitate separation of low density bran and germ particles.
  • An aim of this invention is therefore that of solving the above disadvantages with a device for the classification and separation of particles in cereal milling process comprising: connecting means to connect said device to a screen deck of a purifier, which screen deck can accomplish separation by sifting, a fluidizing bed to support said particles, a pressure chamber arranged under said fluidizing bed, a compressed gas source, a gas inlet port in said chamber for connecting said compressed gas source with said chamber; so that in said pressure chamber a pressure higher than atmospheric pressure is achieved; said fluidizing bed being gas permeable so that a gas passing through said gas inlet port and through said fluidizing bed can accomplish a stratification of said particles, according to density, characterised in that a first vacuum chamber is connected with an upper side of said fluidizing bed.
  • the above device can be used together with old existing purifier apparatuses, or can be assembled with new ones. So the invention also relates to an apparatus comprising the above described device and a screen deck, arranged after said device, for sieving the particles, and a plurality of second vacuum chambers arranged above said screen deck.
  • the invention relates also to a process for the classification and separation of particles in cereal milling comprising a first stage in which particles are stratified on a fluidizing bed operating between a compressed gas source and a vacuum and a second stage in which said stratified particles are separated by sifting.
  • the stratification is achieved by means of terminal velocity separation.
  • the stratification comprises bran and germ particles floating on the surface of a product bed, prior to the entry of said product bed onto a sifting step.
  • the fluidizing bed entails a gas flow of from 3 to 48, preferably 6 to 24 cubic meters per square meter of fluidizing bed surface and per minute.
  • the inlet port 1 of the purifier receives a product mixture consisting of endosperm, bran and germ particles of a specific granulation range.
  • the feeder section 2 spreads the incoming product uniformly across the width of the feeding channel and conveys the so formed product bed into the processing section. Product spreading and conveying is accomplished via oscillation of the entire sieve housing 3, of which the feeder section 2 is an integral part.
  • the oscillating means 13 are made with means per se known.
  • the sieve housing 3 includes preferably one to three superimposed screen decks 4. Furthermore, the sieve housing includes single or multiple collecting troughs for the screen "throughs", multiple selector valves to achieve finely divided product classifications, dedicated to specific "throughs" outlets 10. Each screen deck preferably includes four sieve frames in length, each one allocated to a specific screen mesh size.
  • a plurality of second vacuum chambers 5 is arranged above the screen deck 4 for lifting lower density bran and germ particles off the fluidized product bed traveling on the screen deck 4.
  • the second vacuum chambers 5 are separated by partitions 6 to achieve a laminar air flow above the product bed and to permit operation with selective air velocities between individual second vacuum chambers sections.
  • a second air regulating valve 7 is provided for each of said second vacuum chambers to control air quantities in individual second vacuum chamber sections.
  • the second valves 7 are connected with a vacuum source via an air manifold 8.
  • a filter dust collector separates the "purifier liftings" from the air serving the purifier.
  • the outlet 12 of air manifold 8 collects lower density bran and germ particles.
  • the outlet 9 collects the tail-over products 11 which have neither passed through the screens, nor have been lifted out by terminal velocity separation.
  • the connecting means 20 connect the feeder section 2 to the screen deck 4.
  • the connecting means 20 are represented by a welding, but other means can be used.
  • a fluidizing bed 15 supports the particles.
  • the fluidizing bed 15 is gas permeable and solid impermeable. In other words, air can pass, upwards, through the fluidizing bed 15 and particles cannot pass downwards.
  • the fluidizing bed 15 can be made for example with a mat.
  • a pressure chamber 16 is arranged under the fluidizing bed 15.
  • a compressed gas source 18 is connected with the pressure chamber 16 via a gas inlet port 23.
  • the gas source 18 is connected with the pressure chamber 16 by means of a valve 17, preferably a flow control valve. So that in said pressure chamber 16 a pressure higher than atmospheric pressure is achieved, and so that a gas passing through said gas inlet port 23 and through said fluidizing bed 15 can accomplish a stratification of said particles, according to density.
  • valve 17 allows a precise air volume adjustment to a preset fluidization level of the particles, where density stratification is achieved without expelling particles above the product bed.
  • a first vacuum chamber 24 is connected with an upper side of the fluidizing bed 15.
  • the first vacuum chamber 24 is connected with an air manifold 8 via a flow control valve 25.
  • the classification and terminal velocity separation process is improved and/or shortened by eliminating the horizontal travel of un-stratified high density endosperm particles and entrained low density bran and germ particles within the second vacuum chambers 5.
  • the device according to the invention presents a fully stratified product bed at the entry point of the second vacuum chambers 5.
  • the air volume of the purifier, for the purpose of terminal velocity separation can be reduced, by reducing the length of the second vacuum chambers 5.
  • the required floor space of the purifier can be reduced by reducing the overall length of the purifier.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)

Claims (12)

  1. Dispositif de tri et de séparation de particules dans un procédé de broyage de céréales comprenant : des moyens de connexion (20) pour connecter ledit dispositif à une surface criblante (4) d'un sasseur, cette surface criblante pouvant accomplir la séparation par blutage, un lit de fluidisation (15) pour supporter lesdites particules, une chambre de pression (16) disposée sous ledit lit de fluidisation, une source de gaz comprimé (18), un orifice d'entrée de gaz (23) dans ladite chambre pour connecter ladite source de gaz comprimé avec ladite chambre ; de façon à obtenir dans ladite chambre de pression, une pression supérieure à la pression atmosphérique ; ledit lit de fluidisation (15) étant perméable au gaz de sorte qu'un gaz passant à travers ledit orifice d'entrée de gaz (23) et à travers ledit lit de fluidisation (15) peut accomplir une stratification desdites particules, selon la densité, caractérisé en ce qu'une première chambre à vide (24) est connectée à un côté supérieur dudit lit de fluidisation.
  2. Dispositif selon la revendication 1, dans lequel ladite source de gaz (18) est connectée à ladite chambre de pression au moyen d'une soupape (17).
  3. Dispositif selon la revendication 2, dans lequel ladite soupape (17) est une soupape de régulation de débit.
  4. Dispositif selon au moins l'une des revendications précédentes, dans lequel ledit lit de fluidisation (15) est imperméable aux solides.
  5. Dispositif selon au moins l'une des revendications précédentes, dans lequel ledit de fluidisation (15) nécessite un débit de gaz de 3 à 48, de préférence de 6 à 24 mètres cube par mètre carré de surface du lit de fluidisation et par minute.
  6. Appareil comprenant : un dispositif selon au moins l'une des revendications précédentes, une surface criblante (4), disposée après ledit dispositif, pour tamiser lesdites particules, et une pluralité de secondes chambres à vide (5), disposées au dessus de ladite surface criblante (4) pour obtenir un débit d'air laminaire et pour permettre le fonctionnement avec des vitesses d'air sélectives entre les sections individuelles des secondes chambres à vide (5).
  7. Appareil selon la revendication 6, comprenant une seconde soupape (7) pour chacune desdites secondes chambres à vide (5).
  8. Appareil selon la revendication 7, dans lequel lesdites secondes soupapes (7) sont connectées avec un collecteur d'air (8) et une source de vide.
  9. Procédé de tri et de séparation de particules dans un procédé de broyage de céréales, comprenant une première étape dans laquelle des particules sont stratifiées sur un lit de fluidisation fonctionnant entre une source de gaz comprimé et un vide et une seconde étape dans laquelle lesdites particules stratifiées sont séparées par blutage.
  10. Procédé selon la revendication 9, dans lequel ladite stratification est obtenue au moyen de la séparation par vitesse limite, en particulier pour les particules de faible densité de la couche de surface.
  11. Procédé selon au moins l'une des revendications 9 ou 10, dans lequel ladite stratification comprend des particules de son et de germe flottant sur la surface d'un lit de produit, avant l'entrée dudit lit de produit sur un étage de blutage.
  12. Procédé selon au moins l'une des revendications précédentes, dans lequel ledit lit de fluidisation nécessite un débit de gaz de 3 à 48, de préférence 6 à 24 mètres cube par mètre carré de surface du lit de fluidisation et par minute.
EP96934686A 1995-10-19 1996-10-15 Dispositif et appareil de tri et de separation de particules dans un procede de broyage de cereales Expired - Lifetime EP0855941B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US566895P 1995-10-19 1995-10-19
US65668 1995-10-19
PCT/EP1996/004474 WO1997014513A1 (fr) 1995-10-19 1996-10-15 Dispositif et appareil de tri et de separation de particules dans un procede de broyage de cereales

Publications (2)

Publication Number Publication Date
EP0855941A1 EP0855941A1 (fr) 1998-08-05
EP0855941B1 true EP0855941B1 (fr) 2000-01-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96934686A Expired - Lifetime EP0855941B1 (fr) 1995-10-19 1996-10-15 Dispositif et appareil de tri et de separation de particules dans un procede de broyage de cereales

Country Status (2)

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EP (1) EP0855941B1 (fr)
WO (1) WO1997014513A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4201536A4 (fr) * 2020-08-18 2024-03-06 Satake Corporation Purificateur

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110920947B (zh) * 2019-12-09 2021-09-10 重庆市涪陵区福泰粮油有限公司 一种大米加工定量打包装置

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3148665A1 (de) * 1981-12-09 1983-07-21 Steag Ag, 4300 Essen Verfahren und vorrichtung zur dichtetrennung eines schuettgutgemisches
DD288762A5 (de) * 1989-11-06 1991-04-11 �����@������������������k�� Einrichtung zur trennung von koernigem gut
DE9307072U1 (de) * 1993-05-10 1994-09-22 Claudius Peters Ag, 21614 Buxtehude Vorrichtung zum Sieben eines Schüttgutstroms

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4201536A4 (fr) * 2020-08-18 2024-03-06 Satake Corporation Purificateur

Also Published As

Publication number Publication date
WO1997014513A1 (fr) 1997-04-24
EP0855941A1 (fr) 1998-08-05

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