EP0069633A1 - Process and silo for the homogenization of pulverulent materials - Google Patents

Process and silo for the homogenization of pulverulent materials Download PDF

Info

Publication number
EP0069633A1
EP0069633A1 EP82401162A EP82401162A EP0069633A1 EP 0069633 A1 EP0069633 A1 EP 0069633A1 EP 82401162 A EP82401162 A EP 82401162A EP 82401162 A EP82401162 A EP 82401162A EP 0069633 A1 EP0069633 A1 EP 0069633A1
Authority
EP
European Patent Office
Prior art keywords
silo
lateral zones
aerators
zone
lateral
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.)
Granted
Application number
EP82401162A
Other languages
German (de)
French (fr)
Other versions
EP0069633B1 (en
Inventor
Charles-Hubert Cottignies
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.)
Denis-Sertac SA
Original Assignee
Denis-Sertac SA
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9260234&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0069633(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Denis-Sertac SA filed Critical Denis-Sertac SA
Priority to AT82401162T priority Critical patent/ATE19208T1/en
Publication of EP0069633A1 publication Critical patent/EP0069633A1/en
Application granted granted Critical
Publication of EP0069633B1 publication Critical patent/EP0069633B1/en
Expired legal-status Critical Current

Links

Images

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 present invention relates to the homogenization of pulverulent materials contained in a silo by injecting air by means of aerators placed on the bottom of the silo.
  • the bottom of the silo is divided into several zones and an air flow per unit of surface area is injected into one of the zones, to fluidize the material located above this zone, and into the others zones a much lower air flow per unit area so that the material above these zones is simply ventilated.
  • the material In the area where the material is fluidized, it expands and overflows at the top of the silo onto the material from neighboring areas, the poor ventilation of which is sufficient to allow sliding, at the bottom of the silo, towards the area with a high flow of air.
  • the fluidized material is subjected to a strong turbulence which causes distortion and a mixing of the horizontal layers between them.
  • the bottom of the silo is generally divided into several equal sectors, only one of which is supplied with a high air flow, all the others being supplied at low flow, and this with a circular permutation successively ensuring the fluidization of the material above each sector.
  • this solution requires equipping all the sectors at the bottom of the silo with aerators capable of providing the high air flow rates necessary to ensure the intensive fluidization of the material.
  • a silo the bottom of which comprises a highly ventilated central zone and an annular zone divided into more poorly ventilated circular sectors.
  • the materials set in upward movement above this zone will necessarily be distributed over the entire section of the silo at its upper part- rea, as at each instant only two sectors are ventilated and allow a downward movement of the materials, a large part of the materials arriving at the top of the silo will be deposited on non-ventilated sectors and will not be subjected to homogenization.
  • the aim of the present invention is to reduce the cost and the energy consumption of the compressed air plant supplying the silo and to eliminate the risks inherent in circular permutation systems.
  • the homogenization process which is the subject of the invention applicable to silos the bottom of which is divided into a central zone and two lateral zones, the air flow rate per unit area injected through the central zone being greater than that injected through the lateral zones, is characterized in that the volume of material contained in the silo is divided into partial volumes by fictitious planes, vertical and parallel to each other so that each segment of the bottom of the silo corresponding to one of these volu my partial has a middle zone and two lateral zones, and at any time we only supply compressed air to the aerators provided on a single segment of the bottom of the silo corresponding to said partial volumes, the different segments being supplied successively.
  • a silo is used, the bottom of which is divided into segments by lines extending from one edge to the other of the silo, in parallel vertical planes, each segment being itself divided. in a median zone and two lateral zones, and which comprises in the median zones aerators which are capable of supplying an air flow, relative to the unit of surface of the bottom, markedly greater than that which are capable of supplying, under the same air pressure, the aerators fitted to the lateral zones.
  • the aerators fitted to each central zone are connected to the discharge port of a first compressor or booster by a pipe on which is placed a valve making it possible to isolate or supply compressed air to each central zone individually.
  • the aerators equipping the lateral zones of each segment are connected to the discharge port of a second compressor or booster by a pipe on which is placed a valve making it possible to isolate or supply compressed air. the lateral zones of each segment individually.
  • a central or lateral outlet is provided in the bottom of the silo for the extraction of the material.
  • a successful tunnel s ant this output and arranged diametrically transversely of the segments is provided on the silo bottom; it communicates through lateral openings with the interior of the silo and its floor is covered with air slides inclined towards the exit.
  • the bottom of the silo is inclined towards the tunnel.
  • the silo partially shown in the drawings comprises, in a conventional manner, a cylindrical wall 10, with a vertical axis, a bottom 12 and a ceiling; a lateral outlet opening 16 is provided at its base.
  • the bottom of the silo has the shape of a dihedral whose fictitious edge is arranged in the diametral plane containing the axis of the outlet opening 16 and is inclined towards this opening to facilitate the extraction of the materials.
  • the bottom of the silo is divided in this example into three segments A, B and C whose borders, represented by the dashed lines 18 and 20 in Figure 1, are located at the intersection of two fictitious planes, vertical and parallel between them, and from the bottom surface.
  • Each segment A, B and C is itself divided into a middle zone Al, B1 and Cl and two lateral zones A2, B2 and C2 whose borders are parallel to the edge of the dihedron formed by the bottom of the silo and located at equal distances from them.
  • These different zones are equipped with aerators which consist of flat tubes of rectangular section whose upper face is made of a porous material.
  • the aerators 22 equipping zones A 1 , B 1 , and C 1 are arranged parallel to the edge of the dihedral formed by the bottom of the silo while the aerators 24 equipping zones A 2 , B 2 and C 2 are arranged perpendicularly to this edge.
  • the aerators 22 are wider and closer to each other than the aerators 24, so that the air flow which can be injected per unit area of the bottom in the areas A 1 , B 1 , and C 1 is significantly higher than that which can be injected into zones A 2 , B 2 and C 2 , under the same pressure, so as to be able to carry out an intensive fluidization of the material above the median zones and a simple ventilation at - above the lateral zones.
  • the ratio of the surface of the aerators to the surface of the bottom is approximately 0.5 in the middle zones and approximately 0.2 in the lateral zones.
  • All the aerators fitted to each zone are connected to a common supply pipe.
  • the three pipes T a , Tb and Tc supplying the middle zones A 1 , B 1 and C 1 are connected to a compressor 26 through solenoid valves 28a, 28b and 28c.
  • the three pipes T'a, T'b and T'c supplying the lateral zones A 2 , B 2 and C 2 are re linked to a second compressor 30 through solenoid valves 32a, 32b and 32c.
  • An evacuation tunnel 34 is provided on the bottom 12 of the silo, along the edge of the dihedral which it forms.
  • This tunnel which leads to the outlet opening 16, has on its two sides and over its entire length side openings 36 ensuring communication with the interior of the silo.
  • the floor of the tunnel is equipped with air slides 38 supplied with compressed air by a booster 40.
  • the silo could have a central outlet, the tunnel then having a double slope and inclined from the edges towards the center of the silo.
  • aerators fitted to segment A are supplied with compressed air, the corresponding solenoid valves 28a and 32a being open while the other valves are closed.
  • the aerators of the central zone providing an air flow per unit of high surface area the material located above this zone is highly fluidized; it expands and overflows at the top of the silo onto the material covering the lateral zones A 2 .
  • the material located in the lower part of the silo, above the lateral zones A 2 slides on the inclined bottom of the silo towards zone A 1 , this displacement being made possible by the ventilation created by the air injected into these areas, at low flow.
  • the air flow rate per m2 of surface area of the bottom of the silo injected in zone A 1 is of the order of 30 1 / s and in zones A 2 of 6 1 / s. There is therefore a movement of the material according to the arrows in FIG. 4 which ensures good homogenization in the partial volume of the silo overcoming segment A.
  • a timer closes the valves 28a and 32a and opens the valves 28b and 32b, the valves 28c and 32c remaining closed.
  • the material located above segment B is then set in motion, as indicated by the arrows in FIG. 5, thanks to an intense fluidization above the middle zone B 1 and reduced ventilation above the lateral zones B 2 .
  • the timer then controls the closing of the valves 28b and 32b and the opening of the valves 28c and 32c, to homogenize the material in the same way above the segment C (FIG. 6). These three phases can be repeated as often as necessary to obtain the desired quality of the mixture for the material contained in the silo.
  • the air rails 38 are supplied with compressed air, which allows the material which enters the tunnel 34 through the side openings 36 to flow in the fluidized state until the outlet opening. 16.
  • the extraction can be continuous or discontinuous.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Storage Of Harvested Produce (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

1. Process for the homogenization of a pulverulent material contained in a silo by injection of air through aeration units mounted on the silo bottom which is divided into one median zone and two lateral zones, the volume of air per unit area injected through the median zone being greater than that injected through lateral zones, characterized in that the median zone is divided over its length into several parts (A1 , B1 , C1 ) and at any moment compressed air is supplied only to the aeration units provided in a single one (A1 or B1 or C1 ) of the aforesaid parts of the median zone and into the contiguous sectors (A2 or B2 or C2 respectively) of the lateral zones.

Description

La présente invention concerne l'homogénéisation de matières pulvérulentes contenues dans un silo par injection d'air au moyen d'aérateurs placés sur le fond du silo.The present invention relates to the homogenization of pulverulent materials contained in a silo by injecting air by means of aerators placed on the bottom of the silo.

Selon les procédés connus, le fond du silo est divisé en plusieurs zones et on injecte dans l'une des zones un débit d'air par unité de surface élevé, pour fluidiser la matière située au-dessus de cette zone, et dans les autres zones un débit d'air par unité de surface beaucoup plus faible de façon que la matière au-dessus de ces zones soit simplement aérée. Dans la zone où la matière est fluidisée, elle se dilate et déborde dans le haut du silo sur la matière des zones voisines dont la faible aération est suffisante pour permettre le glissement, dans le bas du silo, vers la zone à fort débit d'air. Il se produit donc un mouvement ascendant des couches horizontales de matière au-dessus des zones à fort débit d'air et un mouvement descendant au-dessus des autres zones. De plus, au-dessus de la zone à fort débit d'air, la matière fluidisée est soumise à une forte turbulence qui provoque une distorsion et un mélange des couches horizontales entre elles.According to known methods, the bottom of the silo is divided into several zones and an air flow per unit of surface area is injected into one of the zones, to fluidize the material located above this zone, and into the others zones a much lower air flow per unit area so that the material above these zones is simply ventilated. In the area where the material is fluidized, it expands and overflows at the top of the silo onto the material from neighboring areas, the poor ventilation of which is sufficient to allow sliding, at the bottom of the silo, towards the area with a high flow of air. There is therefore an upward movement of the horizontal layers of material above the areas with high air flow and a downward movement above the other areas. In addition, above the area with a high air flow, the fluidized material is subjected to a strong turbulence which causes distortion and a mixing of the horizontal layers between them.

Le fond du silo est généralement divisé en plusieurs secteurs égaux dont un seul est alimenté avec un débit d'air élevé, tous les autres étant alimentés à faible débit, et ceci avec une permutation circulaire assurant successivement la fluidisation de la matière au-dessus de chaque secteur.The bottom of the silo is generally divided into several equal sectors, only one of which is supplied with a high air flow, all the others being supplied at low flow, and this with a circular permutation successively ensuring the fluidization of the material above each sector.

Cette permutation régulière des fonctions des secteurs risque de provoquer de simples va-et-vient verticaux des couches de matière, sans mélange des couches entre elles, ce qui est contraire au but recherché.This regular permutation of the functions of the sectors risks provoking simple vertical comings and goings of the layers of material, without mixing of the layers together, which is contrary to the aim sought.

Par ailleurs, cette solution oblige à équiper tous les secteurs du fond du silo d'aérateurs capables de fournir les débits d'air élevés nécessaires pour assurer la fluidisation intensive de la matière.In addition, this solution requires equipping all the sectors at the bottom of the silo with aerators capable of providing the high air flow rates necessary to ensure the intensive fluidization of the material.

On connaît aussi (brevet français N° 2 126 307) un silo dont le fond comprend une zone centrale fortement ventilée et une zone annulaire divisée en secteurs circulaires plus faiblement ventilés. Compte-tenu de la forme circulaire de la zone centrale, les matières mises en mouvement ascendant au-dessus de cette zone vont nécessairement se répartir sur toute la section du silo à sa partie supérieu- rea, comme à chaque instant seulement deux secteurs sont ventilés et autorisent un mouvement descendant des matières, une grande partie des matières arrivées dans le haut du silo se déposera sur des secteurs non ventilés et ne sera pas soumise à l'homogénéisation.Also known (French Patent No. 2,126,307) is a silo, the bottom of which comprises a highly ventilated central zone and an annular zone divided into more poorly ventilated circular sectors. Given the circular shape of the central zone, the materials set in upward movement above this zone will necessarily be distributed over the entire section of the silo at its upper part- rea, as at each instant only two sectors are ventilated and allow a downward movement of the materials, a large part of the materials arriving at the top of the silo will be deposited on non-ventilated sectors and will not be subjected to homogenization.

Dans le brevet français 1 325 873, il est par ailleurs prévu de diviser le fond du silo en une bande médiane fortement ventilée et deux zones latérales plus faiblement ventilées.In French patent 1,325,873, it is also planned to divide the bottom of the silo into a highly ventilated central band and two more poorly ventilated lateral zones.

Le but de la présente invention est de réduire le coût et la consommation d'énergie de la centrale d'air comprimé alimentant le silo et d'éliminer les risques inhérents aux systèmes à permutation circulaire.The aim of the present invention is to reduce the cost and the energy consumption of the compressed air plant supplying the silo and to eliminate the risks inherent in circular permutation systems.

Le procédé d'homogénéisation objet de l'invention applicable aux silos dont le fond est divisé en une zone médiane et deux zones latérales, le débit d'air par unité de surface injecté à travers la zone médiane étant supérieur à celui injecté à travers les zones latérales, est caractérisé en ce que le volume de matière contenue dans le silo est divisé en volumés partiels par des plans fictifs, verticaux et parallèles entre eux de telle sorte que chaque segment du fond du silo correspondant à l'un de ces volumes partiels comporte une zone médiane et deux zones latérales, et à chaque instant on n'alimente en air comprimé que les aérateurs prévus sur un seul des segments du fond du silo correspondant aux dits volumes partiels, les différents segments étant alimentés successivement.The homogenization process which is the subject of the invention applicable to silos the bottom of which is divided into a central zone and two lateral zones, the air flow rate per unit area injected through the central zone being greater than that injected through the lateral zones, is characterized in that the volume of material contained in the silo is divided into partial volumes by fictitious planes, vertical and parallel to each other so that each segment of the bottom of the silo corresponding to one of these volu my partial has a middle zone and two lateral zones, and at any time we only supply compressed air to the aerators provided on a single segment of the bottom of the silo corresponding to said partial volumes, the different segments being supplied successively.

Etant donné qu'à chaque instant seule une partie de la masse totale de matière est aérée ou fluidisée, le débit d'air nécessaire est beaucoup plus faible qu'avec les procédés connus et, par conséquent, le coût et la consommation de la centrale d'air comprimé s'en trouvent réduits.Since only part of the total mass of material is aerated or fluidized at all times, the air flow required is much lower than with known methods and, consequently, the cost and consumption of the plant compressed air is reduced.

Pour la mise en oeuvre de ce procédé, on utilise un silo dont le fond est divisé en segments par des lignes s'étendant d'un bord à l'autre du silo, dans des plans verticaux parallèles, chaque segment étant lui-même divisé en une zone médiane et deux zones latérales, et qui comporte dans les zones médianes des aérateurs qui sont capables de fournir un débit d'air, rapporté à l'unité de surface du fond, nettement supérieur à celui que sont capables de fournir, sous la même pression d'air, les aérateurs équipant les zones latérales.For the implementation of this process, a silo is used, the bottom of which is divided into segments by lines extending from one edge to the other of the silo, in parallel vertical planes, each segment being itself divided. in a median zone and two lateral zones, and which comprises in the median zones aerators which are capable of supplying an air flow, relative to the unit of surface of the bottom, markedly greater than that which are capable of supplying, under the same air pressure, the aerators fitted to the lateral zones.

Les aérateurs équipant chaque zone médiane sont reliés à l'ouïe de refoulement d'un premier compresseur ou surpresseur par une tuyauterie sur laquelle est placée une vanne permettant d'isoler ou d'alimenter en air comprimé chaque zone médiane individuellement. De même, les aérateurs équi-' pant les zones latérales de chaque segment sont reliés à l'ouïe de refoulement d'un second compresseur ou surpresseur par une tuyauterie sur laquelle est placée une vanne permettant d'isoler ou d'alimenter en air comprimé les zones latérales de chaque segment individuellement.The aerators fitted to each central zone are connected to the discharge port of a first compressor or booster by a pipe on which is placed a valve making it possible to isolate or supply compressed air to each central zone individually. Likewise, the aerators equipping the lateral zones of each segment are connected to the discharge port of a second compressor or booster by a pipe on which is placed a valve making it possible to isolate or supply compressed air. the lateral zones of each segment individually.

Une sortie centrale ou latérale est prévue dans le fond du silo pour l'extraction de la matière. Un tunnel aboutis- sant à cette sortie et disposé diamétralement et transversalement aux segments est prévu sur le fond du silo ; il communique par des ouvertures latérales avec l'intérieur du silo et son sol est recouvert d'aéroglissières inclinées vers la sortie. Le fond du silo est incliné vers le tunnel.A central or lateral outlet is provided in the bottom of the silo for the extraction of the material. A successful tunnel s ant this output and arranged diametrically transversely of the segments is provided on the silo bottom; it communicates through lateral openings with the interior of the silo and its floor is covered with air slides inclined towards the exit. The bottom of the silo is inclined towards the tunnel.

D'autres caractéristiques de l'invention apparaîtront à la lecture de la description qui suit et se réfère aux dessins l'accompagnant qui montrent, à titre d'exemple non limitatif, un mode de réalisation de l'invention et sur lesquels :

  • La figure 1 est une vue en plan du fond du silo montrant la disposition des aérateurs et des circuits d'air.
  • La figure 2 est une vue en coupe à plus grande échelle de la partie inférieure du silo, la coupe étant faite suivant un plan vertical proche de l'axe du tunnel d'évacuation et parallèle à celui-ci.
  • La figure 3 est une coupe transversale, à une autre échelle, du tunnel d'évacuation et d'une partie du fond du silo.
  • Les figures 4, 5 et 6 sont des représentations schématiques du silo illustrant trois phases de fonctionnement.
Other characteristics of the invention will appear on reading the description which follows and refers to the accompanying drawings which show, by way of nonlimiting example, an embodiment of the invention and in which:
  • Figure 1 is a plan view of the bottom of the silo showing the arrangement of the aerators and air circuits.
  • Figure 2 is a sectional view on a larger scale of the lower part of the silo, the section being taken along a vertical plane close to the axis of the evacuation tunnel and parallel to it.
  • Figure 3 is a cross section, on another scale, of the evacuation tunnel and part of the bottom of the silo.
  • Figures 4, 5 and 6 are schematic representations of the silo illustrating three phases of operation.

Le silo représenté partiellement sur les dessins comporte, de façon classique, une paroi cylindrique 10, à axe vertical, un fond 12 et un plafond ; une ouverture de sortie latérale 16 est prévue à sa base.The silo partially shown in the drawings comprises, in a conventional manner, a cylindrical wall 10, with a vertical axis, a bottom 12 and a ceiling; a lateral outlet opening 16 is provided at its base.

Le fond du silo a la forme d'un dièdre dont l'arête fictive est disposée dans le plan diamétral contenant l'axe de l'ouverture de sortie 16 et est inclinée vers cette ouverture pour faciliter l'extraction des matières.The bottom of the silo has the shape of a dihedral whose fictitious edge is arranged in the diametral plane containing the axis of the outlet opening 16 and is inclined towards this opening to facilitate the extraction of the materials.

Le fond du silo est divisé dans cet exemple en trois segments A, B et C dont les frontières, représentées par les lignes en traits mixtes 18 et 20 sur la figure 1, sont situées à l'intersection de deux plans fictifs, verticaux et parallèles entre eux, et de la surface du fond.The bottom of the silo is divided in this example into three segments A, B and C whose borders, represented by the dashed lines 18 and 20 in Figure 1, are located at the intersection of two fictitious planes, vertical and parallel between them, and from the bottom surface.

Chaque segment A, B et C est lui-même divisé en une zone médiane Al, B1 et Cl et deux zones latérales A2, B2 et C2 dont les frontières sont parallèles à l'arête du dièdre formé par le fond du silo et situées à égales distances de celles-ci. Ces différentes zones sont équipées d'aérateurs qui sont constitués par des tubes plats à section rectangulaire dont la face supérieure est réalisée en un matériau poreux.Each segment A, B and C is itself divided into a middle zone Al, B1 and Cl and two lateral zones A2, B2 and C2 whose borders are parallel to the edge of the dihedron formed by the bottom of the silo and located at equal distances from them. These different zones are equipped with aerators which consist of flat tubes of rectangular section whose upper face is made of a porous material.

Les aérateurs 22 équipant les zones A1, B1, et C1 sont disposés parallèlement à l'arête du dièdre formé par le fond du silo alors que les aérateurs 24 équipant les zones A2, B2 et C2 sont disposés perpendiculairement à cette arête. Les aérateurs 22 sont plus larges et plus rapprochés les uns des autres que les aérateurs 24, de sorte que le débit d'air que l'on peut injecter par unité de surface du fond dans les zones A1, B1, et C1 est nettement supérieur à celui que l'on peut injecter dans les zones A2, B2 et C2, sous une même pression, de façon à pouvoir réaliser une fluidisation intensive de la matière au-dessus des zones médianes et une simple aération au-dessus des zones latérales. A titre d'exemple, le rapport de la surface des aérateurs à la surface du fond est d'environ 0,5 dans les zones médianes et d'environ 0,2 dans les zones latérales.The aerators 22 equipping zones A 1 , B 1 , and C 1 are arranged parallel to the edge of the dihedral formed by the bottom of the silo while the aerators 24 equipping zones A 2 , B 2 and C 2 are arranged perpendicularly to this edge. The aerators 22 are wider and closer to each other than the aerators 24, so that the air flow which can be injected per unit area of the bottom in the areas A 1 , B 1 , and C 1 is significantly higher than that which can be injected into zones A 2 , B 2 and C 2 , under the same pressure, so as to be able to carry out an intensive fluidization of the material above the median zones and a simple ventilation at - above the lateral zones. By way of example, the ratio of the surface of the aerators to the surface of the bottom is approximately 0.5 in the middle zones and approximately 0.2 in the lateral zones.

Tous les aérateurs équipant chaque zone sont reliés à une tuyauterie d'alimentation commune. Les trois tuyauteries Ta, Tb et Tc alimentant les zones médianes A1, B1 et C1 sont reliées à un compresseur 26 à travers des électrovannes 28a, 28b et 28c. Les trois tuyauteries T'a, T'b et T'c alimentant les zones latérales A2, B2 et C2 sont reliées à un second compresseur 30 à travers des électrovannes 32a, 32b et 32c.All the aerators fitted to each zone are connected to a common supply pipe. The three pipes T a , Tb and Tc supplying the middle zones A 1 , B 1 and C 1 are connected to a compressor 26 through solenoid valves 28a, 28b and 28c. The three pipes T'a, T'b and T'c supplying the lateral zones A 2 , B 2 and C 2 are re linked to a second compressor 30 through solenoid valves 32a, 32b and 32c.

Sur chacune des figures 4, 5 et 6, on n'a représenté que les tuyauteries d'alimentation des zones en service pendant la phase considérée.In each of FIGS. 4, 5 and 6, only the supply pipes for the areas in service during the phase considered have been represented.

Un tunnel d'évacuation 34 est prévu sur le fond 12 du silo, le long de l'arête du dièdre qu'il forme. Ce tunnel, qui aboutit à l'ouverture de sortie 16, comporte sur ses deux côtés et sur toute sa longueur des ouvertures latérales 36 assurant la communication avec l'intérieur du silo. Le sol du tunnel est équipé d'aéroglissières 38 alimentées en air comprimé par un surpresseur 40. En variante, le silo pourrait comporter une sortie centrale, le tunnel étant alors à double pente et incliné des bords vers le centre du silo.An evacuation tunnel 34 is provided on the bottom 12 of the silo, along the edge of the dihedral which it forms. This tunnel, which leads to the outlet opening 16, has on its two sides and over its entire length side openings 36 ensuring communication with the interior of the silo. The floor of the tunnel is equipped with air slides 38 supplied with compressed air by a booster 40. As a variant, the silo could have a central outlet, the tunnel then having a double slope and inclined from the edges towards the center of the silo.

Le principe de fonctionnement du silo va maintenant être décrit en se référant aux figures 4, 5 et 6. Dans une première phase (figure 4) seuls les aérateurs équipant le segment A sont alimentés en air comprimé, les électro-vannes 28a et 32a correspondantes étant ouvertes alors que les autres vannes sont fermées. Les aérateurs de la zone centrale fournissant un débit d'air par unité de surface élevée la matière située au-dessus de cette zone est fortement fluidisée ; elle se dilate et déborde à la partie supérieure du silo sur la matière recouvrant les zones latérales A2. Simultanément, la matière se trouvant dans la partie inférieure du silo, au-dessus des zones latérales A2 glisse sur le fond incliné du silo vers la zone A1, ce déplacement étant rendu possible par l'aération créée par l'air injecté dans ces zones, à faible débit. A titre d'exemple, le débit d'air par m2 de surface du fond du silo injecté dans la zone A1 est de l'ordre de 30 1/s et dans les zones A2 de 6 1/s. Il se produit donc un mouvement de la matière suivant les flèches de la figure 4 qui assure une bonne homogénéisation dans le volume partiel du silo surmontant le segment A.The operating principle of the silo will now be described with reference to Figures 4, 5 and 6. In a first phase (Figure 4) only the aerators fitted to segment A are supplied with compressed air, the corresponding solenoid valves 28a and 32a being open while the other valves are closed. The aerators of the central zone providing an air flow per unit of high surface area the material located above this zone is highly fluidized; it expands and overflows at the top of the silo onto the material covering the lateral zones A 2 . Simultaneously, the material located in the lower part of the silo, above the lateral zones A 2 slides on the inclined bottom of the silo towards zone A 1 , this displacement being made possible by the ventilation created by the air injected into these areas, at low flow. By way of example, the air flow rate per m2 of surface area of the bottom of the silo injected in zone A 1 is of the order of 30 1 / s and in zones A 2 of 6 1 / s. There is therefore a movement of the material according to the arrows in FIG. 4 which ensures good homogenization in the partial volume of the silo overcoming segment A.

Au bout d'un temps prédéterminé, une minuterie ferme les vannes 28a et 32a et ouvre les vannes 28b et 32b, les vannes 28c et 32c restant fermées. La matière située au-dessus du segment B est alors mise en mouvement, comme indiqué par les flèches de la figure 5, grâce à une fluidisation intense au-dessus de la zone médiane B1 et une aération réduite au-dessus des zones latérales B2.After a predetermined time, a timer closes the valves 28a and 32a and opens the valves 28b and 32b, the valves 28c and 32c remaining closed. The material located above segment B is then set in motion, as indicated by the arrows in FIG. 5, thanks to an intense fluidization above the middle zone B 1 and reduced ventilation above the lateral zones B 2 .

La minuterie commande ensuite la fermeture des vannes 28b et 32b et l'ouverture des vannes 28c et 32c, pour homogénéiser de la même façon la matière au-dessus du segment C (figure 6). Ces trois phases peuvent être répétées aussi souvent que nécessaire pour obtenir la qualité souhaitée du mélange pour la matière contenue dans le silo.The timer then controls the closing of the valves 28b and 32b and the opening of the valves 28c and 32c, to homogenize the material in the same way above the segment C (FIG. 6). These three phases can be repeated as often as necessary to obtain the desired quality of the mixture for the material contained in the silo.

Pour extraire la matière du silo, on alimente les aéroglissières 38 en air comprimé ce qui permet à la matière qui pénètre dans le tunnel 34 à travers les ouvertures latérales 36 de s'écouler à l'état fluidisé jusqu'à l'ouverture de sortie 16. L'extraction peut être continue ou discontinue.To extract the material from the silo, the air rails 38 are supplied with compressed air, which allows the material which enters the tunnel 34 through the side openings 36 to flow in the fluidized state until the outlet opening. 16. The extraction can be continuous or discontinuous.

Il est évident que la forme et le nombre des segments du mode de réalisation décrit ne sont pas limitatifs et qu'ils dépendent, en particulier, de la forme et des dimensions du silo, et il est bien entendu que toutes les modifications apportées au mode de réalisation décrit par l'emploi de moyens techniques équivalents entrent dans le cadre de l'invention.It is obvious that the shape and the number of segments of the embodiment described are not limiting and that they depend, in particular, on the shape and dimensions of the silo, and it is understood that all the modifications made to the mode of embodiment described by the use of equivalent technical means are within the scope of the invention.

Claims (3)

1. Procédé d'homogénéisation d'une matière pulvérulente contenue dans un silo par injection d'air au moyen d'aérateurs placés sur le fond du silo qui est divisé en une zone médiane et deux zones latérales, le débit d'air par unité de surface injecté à travers la zone médiane étant supérieur à celui injecté à travers les zones latérales, caractérisé en ce que le volume de matière contenue dans le silo est divisé en volumes partiels par des plans fictifs, verticaux et parallèles entre eux, chaque segment du fond du silo correspondant à l'un de ces volumes partiels comportant une zone médiane et deux zones latérales, et à chaque instant on n'alimente en air comprimé que les aérateurs prévus sur un seul des segments du fond du silo correspondant aux dits volumes partiels, les différents segments étant alimentés successivement.1. Process for the homogenization of a pulverulent material contained in a silo by air injection by means of aerators placed on the bottom of the silo which is divided into a middle zone and two lateral zones, the air flow rate per unit of surface injected through the middle zone being greater than that injected through the lateral zones, characterized in that the volume of material contained in the silo is divided into partial volumes by fictitious planes, vertical and parallel to each other, each segment of the bottom of the silo corresponding to one of these partial volumes comprising a median zone and two lateral zones, and at any time, only the aerators provided on one of the segments of the bottom of the silo corresponding to said partial volumes are supplied with compressed air , the different segments being supplied successively. 2. Silo pour l'homogénéisation d'une matière pulvérulente dont le fond est divisé en une zone médiane et deux zones latérales, la zone médiane étant équipée d'aérateurs capables de fournir un débit d'air, rapporté à l'unité de surface du fond du silo, supérieur à celui que sont capables de fournir, sous la même pression d'alimentation, les aérateurs équipant les zones latérales, caractérisé en ce que le fond du silo est divisé en segments (A, B, C) par des lignes (18, 20) s'étendant d'un bord à l'autre du silo dans des plans verticaux parallèles de telle sorte que chaque segment comporte une zone médiane (A1 , B1, C1) et deux zones latérales (A2, B2, C2), en ce que les aérateurs équipant chaque zone médiane des segments sont reliés à l'ouïe de refoulement d'un premier compresseur ou surpresseur (26) par une tuyauterie (T , Tb , T ) sur la- quelle est placée une vanne (28 a , 28 b , 28 c) permettant d'isoler ou d'alimenter en air comprimé chaque zone médiane individuellement, et en ce que les aérateurs équipant les zones latérales (A2, B2 , C2) de chaque segment sont reliés à l'ouïe de refoulement d'un second compresseur ou surpresseur (30) par une tuyauterie (T' a, T' b, T' c) sur laquelle est placée une vanne (32a, 32b, 32c) permettant d'isoler ou d'alimenter en air comprimé les zones latérales de chaque segment individuellement.2. Silo for the homogenization of a pulverulent material, the bottom of which is divided into a median zone and two lateral zones, the median zone being equipped with aerators capable of supplying an air flow, relative to the surface unit from the bottom of the silo, higher than that which the aerators equipping the lateral zones are capable of supplying, under the same supply pressure, characterized in that the bottom of the silo is divided into segments (A, B, C) by lines (18, 20) extending from one edge to the other of the silo in parallel vertical planes so that each segment has a central zone (A 1 , B 1 , C 1 ) and two lateral zones (A 2, B 2, C 2), in that the aerators equipping each median zone of the segments are connected to the ear discharge of a first compressor or surpress eur (26) by a pipe (T, T b, T) where a valve (28 a, 28 b, 28 c) is placed, making it possible to isolate or supply compressed air to each central zone individually t, and in that the aerators fitted to the lateral zones (A 2 , B 2 , C 2 ) of each segment are connected to the discharge port of a second compressor or booster (30) by a pipe (T 'a, T' b, T 'c) on which is placed a valve (32a, 32b, 32c) allowing isolate or supply compressed air to the lateral zones of each segment individually. 3. Silo selon la revendication 2, caractérisé en ce qu'il comporte sur son fond un tunnel d'évacuation (34) disposé transversalement aux dits segments (A, B, C) et aboutissant à une ouverture de sortie (16) prévue au fond du silo, ce tunnel étant muni sur ses deux côtés d'ouvertures latérales (36) établissant une communication avec l'intérieur du silo, et des aéroglissières (38) placées à l'intérieur du tunnel pour permettre l'écoulement de la matière vers l'ouverture de sortie, celle-ci pouvant être centrale ou latérale.3. Silo according to claim 2, characterized in that it comprises on its bottom an evacuation tunnel (34) arranged transversely to said segments (A, B, C) and leading to an outlet opening (16) provided at bottom of the silo, this tunnel being provided on its two sides with lateral openings (36) establishing communication with the interior of the silo, and air slides (38) placed inside the tunnel to allow the flow of material towards the outlet opening, which may be central or lateral.
EP82401162A 1981-07-06 1982-06-24 Process and silo for the homogenization of pulverulent materials Expired EP0069633B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82401162T ATE19208T1 (en) 1981-07-06 1982-06-24 PROCESS AND SILO FOR HOMOGENIZATION OF POWDERY SUBSTANCES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8113218 1981-07-06
FR8113218A FR2508816B1 (en) 1981-07-06 1981-07-06 PROCESS AND SILO FOR HOMOGENEIZING POWDERY MATERIALS

Publications (2)

Publication Number Publication Date
EP0069633A1 true EP0069633A1 (en) 1983-01-12
EP0069633B1 EP0069633B1 (en) 1986-04-16

Family

ID=9260234

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401162A Expired EP0069633B1 (en) 1981-07-06 1982-06-24 Process and silo for the homogenization of pulverulent materials

Country Status (4)

Country Link
EP (1) EP0069633B1 (en)
AT (1) ATE19208T1 (en)
DE (1) DE3270594D1 (en)
FR (1) FR2508816B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0376008A1 (en) * 1988-12-10 1990-07-04 Linde Aktiengesellschaft Gas introducing system

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1581032C (en) * Hermanns, Wilhelm, 5050 Porz Urbach Homogeneous mixture silo for dusty or floury goods
DE939606C (en) * 1953-02-05 1956-02-23 Moeller Johannes Pneumatic device for mixing and emptying storage silos for dusty and fine-grained goods
FR1154250A (en) * 1955-06-28 1958-04-03 Fuller Co Method and apparatus for mixing a powder material
FR1225239A (en) * 1958-05-20 1960-06-29 Fuller Co Method and apparatus for conditioning powdery and granular materials
FR1325873A (en) * 1962-03-26 1963-05-03 Shell Int Research Method of mixing powdered materials
DE1906018A1 (en) * 1969-02-07 1970-09-03 Peters Ag Claudius Pneumatic mixing of powdered or granulated - substances
FR2121722A1 (en) * 1971-01-11 1972-08-25 Motch Merryweather Machinery
FR2126307A1 (en) * 1971-02-22 1972-10-06 Polysius Ag

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1581032C (en) * Hermanns, Wilhelm, 5050 Porz Urbach Homogeneous mixture silo for dusty or floury goods
DE939606C (en) * 1953-02-05 1956-02-23 Moeller Johannes Pneumatic device for mixing and emptying storage silos for dusty and fine-grained goods
FR1154250A (en) * 1955-06-28 1958-04-03 Fuller Co Method and apparatus for mixing a powder material
FR1225239A (en) * 1958-05-20 1960-06-29 Fuller Co Method and apparatus for conditioning powdery and granular materials
FR1325873A (en) * 1962-03-26 1963-05-03 Shell Int Research Method of mixing powdered materials
DE1906018A1 (en) * 1969-02-07 1970-09-03 Peters Ag Claudius Pneumatic mixing of powdered or granulated - substances
FR2121722A1 (en) * 1971-01-11 1972-08-25 Motch Merryweather Machinery
FR2126307A1 (en) * 1971-02-22 1972-10-06 Polysius Ag

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0376008A1 (en) * 1988-12-10 1990-07-04 Linde Aktiengesellschaft Gas introducing system

Also Published As

Publication number Publication date
DE3270594D1 (en) 1986-05-22
EP0069633B1 (en) 1986-04-16
FR2508816A1 (en) 1983-01-07
ATE19208T1 (en) 1986-05-15
FR2508816B1 (en) 1986-06-27

Similar Documents

Publication Publication Date Title
CA1265469A (en) Void filling devices by means of particulates materials
JP2003502242A5 (en)
CA1261137A (en) Gas suspended powder products distributing device
GB2089330A (en) Discharging storage containers
EP0069633B1 (en) Process and silo for the homogenization of pulverulent materials
FR2771017A1 (en) Distillation column liquid distributor has tubes for connecting non-aligned supply and delivery points
US7438507B2 (en) Method and device for the transportation of pulverulent filling material through a line
CA1137728A (en) Silo for granular material
CA1285374C (en) Device for feeding a declogging gas to the openings of a fluidization grate
EP0169135A1 (en) Valve for the pneumatical distribution of fluidizable materials
US4944598A (en) Continuous flow air blender for dry granular materials
EP0150249B2 (en) Arrangement for storing and homogenizing pulverulent material
EP0201474A1 (en) Distributor for ground or pulverized material, and installation comprising such a distributor
JPS6247575B2 (en)
FR2560065A1 (en) METHOD AND DEVICE FOR MIXING BUD LIQUIDS
FR2763577A1 (en) Silo for storing mixed grains, e.g. for caged bird or pet feed
FR2601933A1 (en) EVACUATION INSTALLATION FOR SILOS CONTAINING BULK PRODUCTS DAMAGED BY BREATHING AIR
GB1219731A (en) Apparatus for the continuous sampling of particulate materials
EP0630966A1 (en) Improved apparatus for the anaerobic fermentation of organic materials
FR2505792A1 (en) TRANSPORT CONTAINER
CH326403A (en) Granular material transporter
FR2562046A1 (en) METHOD AND INSTALLATION FOR PNEUMATIC TRANSPORT AND MIXTURE
SU1346510A1 (en) Arrangement for unloading from silos
US3279864A (en) Pneumatic conveyor
FR2908403A1 (en) Anaerobic treatment of effluent having concentration of high dried material in digester, includes distributing the effluents on adduction unit and evacuation unit at a level of closed tank, and conferring forced circulation to the effluent

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE GB IT LI LU NL SE

17P Request for examination filed

Effective date: 19830702

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE GB IT LI LU NL SE

REF Corresponds to:

Ref document number: 19208

Country of ref document: AT

Date of ref document: 19860515

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3270594

Country of ref document: DE

Date of ref document: 19860522

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19860626

Year of fee payment: 5

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19860630

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

26 Opposition filed

Opponent name: KRUPP POLYSIUS AG

Effective date: 19861223

NLR1 Nl: opposition has been filed with the epo

Opponent name: KRUPP POLYSIUS AG

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19870630

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19880624

Ref country code: AT

Effective date: 19880624

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19880625

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19880630

Ref country code: CH

Effective date: 19880630

PLBN Opposition rejected

Free format text: ORIGINAL CODE: 0009273

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: OPPOSITION REJECTED

BERE Be: lapsed

Owner name: DENIS-SERTAC S.A.

Effective date: 19880630

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19890101

27O Opposition rejected

Effective date: 19880826

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19890301

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19890630

EUG Se: european patent has lapsed

Ref document number: 82401162.1

Effective date: 19890220