EP0150249B1 - Arrangement for storing and homogenizing pulverulent material - Google Patents

Arrangement for storing and homogenizing pulverulent material Download PDF

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Publication number
EP0150249B1
EP0150249B1 EP84101062A EP84101062A EP0150249B1 EP 0150249 B1 EP0150249 B1 EP 0150249B1 EP 84101062 A EP84101062 A EP 84101062A EP 84101062 A EP84101062 A EP 84101062A EP 0150249 B1 EP0150249 B1 EP 0150249B1
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EP
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Prior art keywords
storage
homogenization
silo
orifices
chamber
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EP84101062A
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German (de)
French (fr)
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EP0150249A1 (en
EP0150249B2 (en
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Robert Courtay
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Fuller Co
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Fuller Co
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Priority to FR8300113A priority Critical patent/FR2538794B1/en
Application filed by Fuller Co filed Critical Fuller Co
Priority to DE8484101062T priority patent/DE3468398D1/en
Priority to EP84101062A priority patent/EP0150249B2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/54—Large containers characterised by means facilitating filling or emptying
    • B65D88/72—Fluidising devices
    • 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
    • B01F33/4092—Storing receptacles provided with separate mixing chambers

Definitions

  • the present invention relates to a storage and homogenization assembly for pulverulent products, in particular the manufacturing products used in the field of cement works.
  • German patent DE-A-2724928 describes a storage and homogenization assembly for pulverulent products, of the type for treatment and transfer of pulverulent materials by fluidized beds, in which the storage silo is distinct from a chamber. homogenization and superimposed on the latter, the upper part of the silo comprising an inlet at several points of crushed raw material, said chamber comprising equidistant orifices for transfer by gravity as well as a flat bottom inclined towards a drain outlet, covering its entire surface in a zone fluidization arrangement, said storage silo comprising a bottom slab, said slab comprising said transfer orifices, the bottom of said silo comprising a cone, as well as a crown of fluidizing elements; said set comprising:
  • Supply orifices of the homogenization chamber disposed at its upper part, the outlet from said chamber being arranged laterally at the lower part of the latter at the base of an extraction column; a material outlet, disposed at the top of said column; the transfer orifices being able to be opened sequentially with an adjustable opening time of each of said orifices, relative to the feed orifices of the silo, open simultaneously or sequentially.
  • the present invention aims to provide a compact set of storage and homogenization with high capacity, efficient and reliable, in which all the elements are focused on saving energy and lowering the cost price, while allowing operations easy with the possibility of permanent intervention.
  • the bottom slab of the storage silo forms the ceiling of the homogenization chamber, thereby ensuring the separation between said silo and said bedroom;
  • the cone is a cone with a slight slope provided with second fluidization elements; each of said first and second fluidization elements is formed by a conduit comprising a flat bottom provided with air inlets and a porous cap, the conduits forming the second fluidization elements being arranged along the generatrices of said cone.
  • Fig. 1 shows a schematic view in section in elevation of an assembly according to the invention, the lower part C of this figure constituting a view along C-C of FIG. 2;
  • fig. 2 shows a schematic view of the silo bottom along A-A of FIG. 1;
  • fig. 3 shows a schematic view of the bottom of the homogenization chamber according to B-B in FIG. 2, with block diagram of the air circuits, and
  • fig. 4 shows a schematic cross-sectional view of a porous element for fluidizing the bottom of the silo, according to the invention.
  • the assembly according to the invention is generally cylindrical in shape and comprises a storage silo 1 superimposed on a homogenization chamber 2 with which it communicates in the manner which will be better explained below.
  • the silo 1 has at its upper part a supply member 3 for raw crushed products, advantageously conveyed by pneumatic conveyor.
  • the feed member 3 is constituted by a fluidized bottom distributor over its entire surface and opening into the silo for example at six equidistant points 4, in a manner known per se.
  • the transport fluid is evacuated by means of a suitable filter F also placed at the top of the silo 1.
  • the bottom of the silo 1 has in its center a cone 5 with a slightly inclined slope, at an angle of approximately 10 to 15 °, furnished with fluidization elements 6 according to its generatrices.
  • the silo bottom has a reduction in diameter forming a conical bottom 8 whose small diameter defines with respect to the cone 5 an annular space or crown 9 (fig. 2) provided for example with six orifices equidistant 10 in the form of vertical wells each disposed in the center of a set of radiating porous fluidization conduits 11.
  • These orifices 10 with the fluidization equipment 11 constitute the communication passages between the silo 1 and the homogenization chamber 2.
  • each orifice 10 is also provided, under the floor 12 of the silo bottom, with a box of fluidization, a pneumatically controlled register and a manual isolation hatch, in a manner known per se.
  • the fluidization at the level of the six orifices 10 takes place cyclically via the sets of conduits 11, as well as the opening of the six registers, in a programmable and controlled manner.
  • the material undergoes a statistical mixing by regular flow causing a constant descent.
  • the orifices 10 alternate with respect to the points 4.
  • the storage silo 1 is superimposed on the homogenization chamber 2 and the bottom slab 12 is supported, on the one hand, by the outer skirt 13 and, on the other hand, by the skirt 14 of the homogenization chamber 2.
  • the height of the chamber 2 is substantially in the ratio 1: 1 with its diameter, so as to reduce the power necessary for the supply of fluidizing air: thus, chamber 2 allows the use of "boosters", which are more energy efficient than "compressors".
  • the homogenization chamber 2 is of substantially cylindrical shape and comprises at the periphery of its upper part several equidising openings 15, for example six, corresponding to the orifices 10 of the slab 12 for separating the silo and the chamber 2, ensuring the feeding of said chamber by gravity from the latter.
  • the bottom 16 of the homogenization chamber 2 covers its entire surface. It is generally planar and it is inclined towards a lower orifice 17 of the skirt 14, opening into an extraction column E.
  • the bottom 16 is of the type divided into zones, for example four quadrants 18, 19, 20 and 21 respectively, operating "in rotation", one zone being active while the other three are inactive.
  • boosters respectively supply an active air duct 22 and an inactive air duct 23 connected to an automatic rotary valve 24 from which the distribution ducts leave each of the zones 18 to 21.
  • the homogenization chamber 2 has an outlet 25 disposed laterally at the top of its skirt 14 and connected to the extraction column E at the base of which is arranged a suitable fluidizing means 26, as well as a drain outlet V.
  • a suitable fluidizing means 26 as well as a drain outlet V.
  • the material is introduced by gravity through the feed orifices 15, it undergoes mixing in a fluidized bed via the bottom 16, passes through the lower orifice 17 in the extraction column and then rises at the height of the outlet 27 from which it is extracted.
  • a deflector 28 is moreover arranged inside the chamber 2, in front of the outlet 25, so as to possibly allow the latter to pass only through the material which has undergone homogenization, in the case of a supply by “ overflow ”.
  • a level measuring device (not shown) is included in the extraction column E and it is connected to the extraction control members in order to maintain an optimal level in the chamber.
  • this level measuring device can be of the gamma ray type.
  • the degassing of the chamber 2 is ensured by a column 29, the base of which is arranged in line with the fluidization elements 26 supplied with active air and the outlet of which is at the top of the storage silo 1.
  • each constituent element of the fluidization equipment 6 and 11 is formed by an open conduit 30 (fig. 4) constituted by a ramp comprising a bottom dish 31 provided with air inlets 32 and surmounted by a convex porous cap, itself constituted by a rigid perforated support 33 covered with a sheet of suitable porous material 34.
  • one conducts air inlet 32 is mounted on an orifice in the bottom 31 by means of a flexible gasket 35 the inner face of which matches the outer periphery of the duct and the outer part comprises lips 36 enclosing the edge of the orifice of the bottom 31.
  • An internal reinforcement 37 attached to the perforated support 33 prevents any deformation of the open duct 30, while the upper cap is simply held by crimping the edges 38 of the plate forming the flat bottom 31 and folded over the edges of the sheet 34.
  • the storage and homogenization assembly as described above further includes all the necessary control elements, such as inspection doors, isolation hatches, programming and monitoring boxes, coupled with manual emergency controls and intervention.
  • the result is a reliable and compact installation, with the following advantages in particular: moderate investment in civil engineering, moderate investment in air source, moderate consumption in electrical power, guaranteed total drainage (in V fig. 1), control power supply, possibility of intervention on the homogenization chamber while keeping a large storage capacity, etc.
  • the storage operation (in 1) precedes the homogenization (in 2) which offers the advantage of using the product coming directly from the latter , unlike known installations where storage is carried out in a mixed state which can lead to a loss of homogeneity.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Storage Of Harvested Produce (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)

Description

La présente invention concerne un ensemble de stockage et d'homogénéisation pour produits pulvérulents, en particulier les produits de fabrication mis en oeuvre dans le domaine de la cimenterie.The present invention relates to a storage and homogenization assembly for pulverulent products, in particular the manufacturing products used in the field of cement works.

On sait que dans le cas de la fabrication de ciments, des produits broyés bruts généralement formés en continu doivent subir un stockage et une homogénéisation avant l'opération suivante de fabrication, à savoir, une cuisson au four, généralement effectuée en continu également. Afin d'opérer dans les conditions les plus favorables, il y a donc lieu, d'une part, de réduire au minimum les besoins en installations encombrantes et coûteuses et, d'autre part, d'assurer le stockage et l'homogénéisation de la matière première de la façon la plus compacte et la plus économique, notamment en énergie électrique d'alimentation. Dans de telles installations, le traitement et le transfert des produits sont effectués en lits fluidisés.It is known that in the case of the manufacture of cements, rough ground products generally formed continuously must undergo storage and homogenization before the next manufacturing operation, namely, baking in an oven, generally also carried out continuously. In order to operate under the most favorable conditions, it is therefore necessary, on the one hand, to minimize the need for bulky and costly installations and, on the other hand, to ensure the storage and homogenization of the raw material in the most compact and economical way, especially in electrical power supply. In such installations, the treatment and transfer of the products are carried out in fluidized beds.

Dans ce domaine, le brevet allemand DE-A-2724928 décrit en ensemble de stockage et d'homogénéisation pour produits pulvérulents, du type à traitement et transfert de matières pulvérulentes par lits fluidisés, dans lequel le silo de stockage est distinct d'une chambre d'homogénéisation et superposé à cette dernière, la partie supérieure du silo comportant une entrée en plusieurs points de matière brute broyée, ladite chambre comportant des orifices équidistants de transfert par gravité ainsi qu'un fond plan et incliné vers une sortie de vidange, couvrant toute sa surface selon un agencement de fluidisation par zones, ledit silo de stockage comportant une dalle de fond, ladite dalle comportant lesdits orifices de transfert, le fond dudit silo comportant un cône, ainsi qu'une couronne d'éléments de fluidisation; ledit ensemble comprenant:In this field, the German patent DE-A-2724928 describes a storage and homogenization assembly for pulverulent products, of the type for treatment and transfer of pulverulent materials by fluidized beds, in which the storage silo is distinct from a chamber. homogenization and superimposed on the latter, the upper part of the silo comprising an inlet at several points of crushed raw material, said chamber comprising equidistant orifices for transfer by gravity as well as a flat bottom inclined towards a drain outlet, covering its entire surface in a zone fluidization arrangement, said storage silo comprising a bottom slab, said slab comprising said transfer orifices, the bottom of said silo comprising a cone, as well as a crown of fluidizing elements; said set comprising:

Des orifices d'alimentation de la chambre d'homogénéisation disposés à sa partie supérieure, la sortie de ladite chambre étant disposée latéralement à la partie inférieure de cette dernière à la base d'une colonne d'extraction; une sortie de matière, disposée à la partie supérieure de ladite colonne; les orifices de transfert pouvant être ouverts séquentiellement avec un temps d'ouverture réglable de chacun desdits orifices, par rapport aux orifices d'alimentation du silo, ouverts simultanément ou séquentiel lement.Supply orifices of the homogenization chamber disposed at its upper part, the outlet from said chamber being arranged laterally at the lower part of the latter at the base of an extraction column; a material outlet, disposed at the top of said column; the transfer orifices being able to be opened sequentially with an adjustable opening time of each of said orifices, relative to the feed orifices of the silo, open simultaneously or sequentially.

La présente invention vise à fournir un ensemble compact de stockage et d'homogénéisation à capacité élévée, efficace et fiable, dans lequel tous les éléments sont axés sur l'économie en énergie et l'abaissement du prix de revient, tout en permettant des opérations aisées avec possibilité d'intervention permanente.The present invention aims to provide a compact set of storage and homogenization with high capacity, efficient and reliable, in which all the elements are focused on saving energy and lowering the cost price, while allowing operations easy with the possibility of permanent intervention.

Conformément à l'invention, dans un ensemble de stockage et d'homogénéisation pour produits pulvérulents du type précité, la dalle de fond du silo de stockage forme le plafond de la chambre d'homogénéisation, en assurant ainsi la séparation entre ledit silo et ladite chambre; le cône est un cône à faible pente muni de seconds éléments de fluidisation; chacun desdits premiers et seconds éléments de fluidisation est formé par un conduit comportant un fond plat muni d'entrées d'air et une calotte poreuse, les conduits formant les seconds éléments de fluidisation étant disposées selon les génératrices dudit cône.According to the invention, in a storage and homogenization assembly for powdered products of the aforementioned type, the bottom slab of the storage silo forms the ceiling of the homogenization chamber, thereby ensuring the separation between said silo and said bedroom; the cone is a cone with a slight slope provided with second fluidization elements; each of said first and second fluidization elements is formed by a conduit comprising a flat bottom provided with air inlets and a porous cap, the conduits forming the second fluidization elements being arranged along the generatrices of said cone.

D'autres caractéristiques et avantage de l'invention ressortiront mieux de la description qui va suivre, faite en regard des dessins annexés sur lesquels:Other characteristics and advantages of the invention will emerge more clearly from the description which follows, given with reference to the appended drawings in which:

La fig. 1 représente une vue schématique en coupe en élévation d'un ensemble selon l'invention, la partie inférieure C de cette figure constituant une vue selon C-C de la fig. 2;Fig. 1 shows a schematic view in section in elevation of an assembly according to the invention, the lower part C of this figure constituting a view along C-C of FIG. 2;

la fig. 2 représente une vue schématique du fond de silo selon A-A de la fig. 1;fig. 2 shows a schematic view of the silo bottom along A-A of FIG. 1;

la fig. 3 représente une vue schématique du fond de chambre d'homogénéisation selon B-B de la fig. 2, avec schéma synoptique des circuits d'air, etfig. 3 shows a schematic view of the bottom of the homogenization chamber according to B-B in FIG. 2, with block diagram of the air circuits, and

la fig. 4 représente une vue schématique en coupe transversale d'un élément poreux de fluidisation du fond de silo, selon l'invention.fig. 4 shows a schematic cross-sectional view of a porous element for fluidizing the bottom of the silo, according to the invention.

Sur ces dessins, les mêmes références désignent les mêmes éléments.In these drawings, the same references designate the same elements.

En se référant aux fig. 1 à 3, l'ensemble selon l'invention est de forme généralement cylindrique et comprend un silo 1 de stockage superposé à une chambre d'homogénéisation 2 avec laquelle il communique de la manière qui sera mieux expliquée ci-après. Le silo 1 comporte à sa partie supérieure un organe d'alimentation 3 en produits broyés bruts, avantageusement convoyés par transporteur pneumatique. Dans ce cas, l'organe d'alimentation 3 est constitué par un répartiteur à fond fluidisé sur toute sa surface et débouchant dans le silo par exemple en six points équidistants 4, de façon connue en soi. L'évacuation du fluide de transport a lieu par l'intermédiaire d'un filtre approprié F également disposé à la partie supérieure du silo 1.Referring to fig. 1 to 3, the assembly according to the invention is generally cylindrical in shape and comprises a storage silo 1 superimposed on a homogenization chamber 2 with which it communicates in the manner which will be better explained below. The silo 1 has at its upper part a supply member 3 for raw crushed products, advantageously conveyed by pneumatic conveyor. In this case, the feed member 3 is constituted by a fluidized bottom distributor over its entire surface and opening into the silo for example at six equidistant points 4, in a manner known per se. The transport fluid is evacuated by means of a suitable filter F also placed at the top of the silo 1.

Le fond du silo 1 comporte en son centre un cône 5 à pente peu inclinée, selon un angle de 10 à 15° environ, garni d'éléments de fluidisation 6 selon ses génératrices. A la base de sa jupe intérieure 7, le fond de silo présente une réduction de diamètre formant un fond conique 8 dont le petit diamètre définit par rapport au cône 5 un espace annulaire ou couronne 9 (fig. 2) muni par exemple de six orifices équidistants 10 sous forme de puits verticaux chacun disposé au centre d'un jeu de conduits de fluidisation poreux 11 rayonnants. Ces orifices 10 avec les équipements de fluidisation 11 constituent les passages de communication entre le silo 1 et la chambre d'homogénéisation 2. Bien entendu, chaque orifice 10 est également muni, sous le plancher 12 de fond de silo, d'une boîte de fluidisation, d'un registre à commande pneumatique et d'une trappe manuelle d'isolement, de façon connue en soi. En fonctionnement, la fluidisation au niveau des six orifices 10 a lieu cycliquement par l'intermédiaire des jeux de conduits 11, de même que l'ouverture des six registres, de manière programmable et contrôlée. Il y a lieu de noter que lorsqu'éventuellement l'alimentation du silo 1 est effectuée simultanément par les points 4 et son extraction cycliquement par les six orifices 10 ouverts séquentiellement, la matière subit un brassage statistique par écoulement régulier provoquant une descente constante. En outre, les orifices 10 sont en alternance par rapport aux points 4.The bottom of the silo 1 has in its center a cone 5 with a slightly inclined slope, at an angle of approximately 10 to 15 °, furnished with fluidization elements 6 according to its generatrices. At the base of its inner skirt 7, the silo bottom has a reduction in diameter forming a conical bottom 8 whose small diameter defines with respect to the cone 5 an annular space or crown 9 (fig. 2) provided for example with six orifices equidistant 10 in the form of vertical wells each disposed in the center of a set of radiating porous fluidization conduits 11. These orifices 10 with the fluidization equipment 11 constitute the communication passages between the silo 1 and the homogenization chamber 2. Of course, each orifice 10 is also provided, under the floor 12 of the silo bottom, with a box of fluidization, a pneumatically controlled register and a manual isolation hatch, in a manner known per se. In operation, the fluidization at the level of the six orifices 10 takes place cyclically via the sets of conduits 11, as well as the opening of the six registers, in a programmable and controlled manner. It should be noted that when possibly the feeding of the silo 1 is carried out simultaneously by the points 4 and its cyclic extraction by the six openings 10 opened sequentially, the material undergoes a statistical mixing by regular flow causing a constant descent. In addition, the orifices 10 alternate with respect to the points 4.

Comme indiqué ci-dessus, le silo de stockage 1 est superposé à la chambre d'homogénéisation 2 et la dalle de fond 12 est supportée, d'une part, par la jupe extérieure 13 et, d'autre part, par la jupe 14 de la chambre d'homogénéisation 2. Conformément à l'invention, la hauteur de la chambre 2 est sensiblement dans le rapport 1:1 avec son diamètre, de manière à réduire la puissance nécessaire à l'alimentation en air de fluidisation: ainsi, la chambre 2 permet l'utilisation de «surpresseurs», plus économiques en énergie que les «compresseurs».As indicated above, the storage silo 1 is superimposed on the homogenization chamber 2 and the bottom slab 12 is supported, on the one hand, by the outer skirt 13 and, on the other hand, by the skirt 14 of the homogenization chamber 2. According to the invention, the height of the chamber 2 is substantially in the ratio 1: 1 with its diameter, so as to reduce the power necessary for the supply of fluidizing air: thus, chamber 2 allows the use of "boosters", which are more energy efficient than "compressors".

La chambre d'homogénéisation 2 est de forme sensiblement cylindrique et comporte à la périphérie de sa partie supérieure plusieurs ouvertures 15 équidisantes, par exemple six, correspondant aux orifices 10 de la dalle 12 de séparation du silo et de la chambre 2, assurant l'alimentation de ladite chambre par gravité à partir de ce dernier.The homogenization chamber 2 is of substantially cylindrical shape and comprises at the periphery of its upper part several equidising openings 15, for example six, corresponding to the orifices 10 of the slab 12 for separating the silo and the chamber 2, ensuring the feeding of said chamber by gravity from the latter.

Le fond 16 de la chambre d'homogénéisation 2 couvre toute sa surface. Il est de forme générale plane et il est incliné en direction d'un orifice inférieur 17 de la jupe 14, débouchant dans une colonne d'extraction E. De façon connue en soi, le fond 16 est du type divisé en zones, par exemple quatre quadrants respectivement 18, 19, 20 et 21, fonctionnant «en rotation», une zone étant active pendant que les trois autres sont inactives. A cet effet, des surpresseurs (non représentés) alimentent respectivement un conduit d'air actif 22 et un conduit d'air inactif 23 reliés à une vanne rotative automatique 24 d'où partent les conduits de distribution de chacune des zones 18 à 21.The bottom 16 of the homogenization chamber 2 covers its entire surface. It is generally planar and it is inclined towards a lower orifice 17 of the skirt 14, opening into an extraction column E. In a manner known per se, the bottom 16 is of the type divided into zones, for example four quadrants 18, 19, 20 and 21 respectively, operating "in rotation", one zone being active while the other three are inactive. To this end, boosters (not shown) respectively supply an active air duct 22 and an inactive air duct 23 connected to an automatic rotary valve 24 from which the distribution ducts leave each of the zones 18 to 21.

La chambre d'homogénéisation 2 comporte une sortie 25 disposée latéralement à la partie supérieure de sa jupe 14 et reliée à la colonne d'extraction E à la base de laquelle est disposé un moyen de fluidisation convenable 26, ainsi qu'une sortie de vidange V. En fonctionnement, la matière est introduite par gravité au travers des orifices d'alimentation 15, elle subit le brassage en lit fluidisé par l'intermédiaire du fond 16, passe par l'orifice inférieur 17 dans la colonne d'extraction puis remonte à la hauteur de la sortie 27 d'où elle est extraite. Un déflecteur 28 est par ailleurs disposé à l'intérieur de la chambre 2, en avant de la sortie 25, afin de ne laisser passer éventuellement par cette dernière que la matière ayant subi l'homogénéisation, dans le cas d'une alimentation par «sur- verse».The homogenization chamber 2 has an outlet 25 disposed laterally at the top of its skirt 14 and connected to the extraction column E at the base of which is arranged a suitable fluidizing means 26, as well as a drain outlet V. In operation, the material is introduced by gravity through the feed orifices 15, it undergoes mixing in a fluidized bed via the bottom 16, passes through the lower orifice 17 in the extraction column and then rises at the height of the outlet 27 from which it is extracted. A deflector 28 is moreover arranged inside the chamber 2, in front of the outlet 25, so as to possibly allow the latter to pass only through the material which has undergone homogenization, in the case of a supply by “ overflow ”.

Un dispositif de mesure de niveau (non représenté) est inclus dans la colonne d'extraction E et il est relié aux organes de commande de l'extraction afin de maintenir un niveau optimal dans la chambre. De façon connue en soi, ce dispositif de mesure de niveau peut être du type à rayons gamma.A level measuring device (not shown) is included in the extraction column E and it is connected to the extraction control members in order to maintain an optimal level in the chamber. In a manner known per se, this level measuring device can be of the gamma ray type.

Par ailleurs, le dégazage de la chambre 2 est assuré par une colonne 29 dont la base est disposée au droit des éléments de fluidisation 26 alimentés en air actif et dont la sortie est à la partie supérieure du silo de stockage 1.Furthermore, the degassing of the chamber 2 is ensured by a column 29, the base of which is arranged in line with the fluidization elements 26 supplied with active air and the outlet of which is at the top of the storage silo 1.

Conformément à l'invention, et dans le but d'une économie de matière et d'énergie, chaque élément constitutif des équipements de fluidisation 6 et 11 est formé par un conduit ouvert 30 (fig. 4) constitué par une rampe comportant un fond plat 31 muni d'entrées d'air 32 et surmonté d'une calotte poreuse convexe, elle-même constituée par un support perforé rigide 33 recouvert d'une feuille d'un matériau poreux convenable 34. De façon particulièrement avantageuse, on conduit d'entrée d'air 32 est monté sur un orifice du fond 31 par l'intermédiaire d'un joint d'étanchéité souple 35 dont la face intérieure épouse la périphérie extérieure du conduit et la partie extérieure comprend des lèvres 36 enserrant le bord de l'orifice du fond 31. Un renfort intérieur 37 rapporté sur le support perforé 33 empêche toute déformation du conduit ouvert 30, tandis que la calotte supérieure est simplement maintenue par sertissage des bords 38 de la plaque formant le fond plat 31 et repliés sur les bords de la feuille 34.In accordance with the invention, and with the aim of saving material and energy, each constituent element of the fluidization equipment 6 and 11 is formed by an open conduit 30 (fig. 4) constituted by a ramp comprising a bottom dish 31 provided with air inlets 32 and surmounted by a convex porous cap, itself constituted by a rigid perforated support 33 covered with a sheet of suitable porous material 34. In a particularly advantageous manner, one conducts air inlet 32 is mounted on an orifice in the bottom 31 by means of a flexible gasket 35 the inner face of which matches the outer periphery of the duct and the outer part comprises lips 36 enclosing the edge of the orifice of the bottom 31. An internal reinforcement 37 attached to the perforated support 33 prevents any deformation of the open duct 30, while the upper cap is simply held by crimping the edges 38 of the plate forming the flat bottom 31 and folded over the edges of the sheet 34.

L'ensemble de stockage et d'homogénéisation tel que décrit ci-dessus comporte en outre tous les organes de contrôle nécessaires, tels que portes de visite, trappes d'isolement, boîtes de programmation et de surveillance, doublées de commandes manuelles de secours et d'intervention. Il en résulte une installation fiable et compacte, présentant notamment les avantages suivants: investissement modéré en génie civil, investissement modéré en source d'air, consommation modérée en puissance électrique, garantie d'une vidange totale (en V fig. 1), contrôle effectif de l'alimentation, possibilité d'intervention sur la chambre d'homogénéisation en gardant une grande capacité de stockage, etc. Il y a lieu de noter plus particulièrement que, conformément à l'invention, l'opération de stockage (en 1) précède l'homogénéisation (en 2), ce qui offre l'avantage d'utiliser le produit provenant directement de cette dernière, contrairement à des installations connues où le stockage est effectué à l'état mélangé pouvant entraîner une perte d'homogénéité.The storage and homogenization assembly as described above further includes all the necessary control elements, such as inspection doors, isolation hatches, programming and monitoring boxes, coupled with manual emergency controls and intervention. The result is a reliable and compact installation, with the following advantages in particular: moderate investment in civil engineering, moderate investment in air source, moderate consumption in electrical power, guaranteed total drainage (in V fig. 1), control power supply, possibility of intervention on the homogenization chamber while keeping a large storage capacity, etc. It should be noted more particularly that, in accordance with the invention, the storage operation (in 1) precedes the homogenization (in 2), which offers the advantage of using the product coming directly from the latter , unlike known installations where storage is carried out in a mixed state which can lead to a loss of homogeneity.

Il est bien entendu que la présente invention n'a été décrite en représentée qu'à titre explicatif mais nullement limitatif et qu'on pourra y apporter toute modification utile, notamment dans le domaine des équivalences techniques, sans sortir de son cadre, tel qu'il est defini dans les revendications.It is understood that the present invention has been described in the illustrative but in no way limiting manner and that any useful modification may be made to it, in particular in the field of technical equivalences, without going beyond its ambit, such as 'It is defined in the claims.

Claims (7)

1. An assembly for the storage and homogenization of powdery products, of the fluidized bed treatment and powdery material transfer type, in which the storage silo (1) is separate from an homogenization chamber (2) and superimposed thereon, the upper part of the storage silo (1) comprising an inlet (3) at several points for crushed raw material, said chamber comprising equidistant gravity transfer orifices (10) as well as a flat bottom (16) slanted towards a discharge outlet, covering the whole of its surface in a zone fluidization arrangement, said storage silo (1) comprising a bottom slab (12) having said transfer orifices (10), the bottom of said storage silo comprising a cone (5) as well as a ring of first fluidization elements (11) disposed about the transfer orifices (10), said storage and homogenization assembly comprising: orifices (15) for feeding the homogenization chamber disposed at its upper part, the outlet (17) from said chamber being disposed laterally at the lower part of this latter at the base of an extraction column (E); a material outlet (27) disposed at the upper part of said extraction column; the transfer orifices (10) of the bottom slab being able to be opened sequentially with an adjustable opening time for each of said orifices, with respect to the feed orifices (4) of the silo, open simultaneously and sequentially; said storage and homogenization assembly being characterized in that: the bottom slab (12) of the storage silo (1) forms the ceiling of the homogenization chamber, thus ensuring separation between said silo and said chamber; the cone (5) is a low gradient cone with second fluidization elements (6); each of said first (11) and second (6) fluidization elements is formed by a duct (30) having a flat bottom (31) with air inlets (32) and a porous dome (34), said ducts forming the second fluidization elements (6) being disposed along the genera- trices of said cone (5).
2. Storage and homogenization assembly according to claim 1, characterized in that each air inlet (32) is mounted on an orifice of the bottom (31) through a flexible seal (35) with lips (36).
3. Storage and homogenization assembly according to claim 1, characterized in that the porous dome is formed by a rigid perforated support (33) covered with a porous material foil (34), an inner reinforcement (37) being applied to said perforated support (33), whereas the upper dome is held in position by crimping the edges (38) of the plate forming the flat bottom (31) and folding them back on the edges of the foil (34).
4. Storage and homogenization assembly according to any one of claims 1 to 3, characterized in that the extraction column is provided with a level sensor at the height of the outlet (27), connected to the members controlling extraction of the homogenized product.
5. Storage and homogenization assembly according to any one of claims 1 to 4, characterized in that the homogenization chamber has a height substantially equal to its diameter so as to reduce the power required for supplying fluidization air, ensured therefore by boosters.
6. Storage and homogenization assembly according to any one of claims 1 to 5, characterized in that the orifices (10) of the silo bottom are disposed alternately with respect to the feed orifices (4) for said silo.
7. Storage and homogenization assembly according to any one of claims 1 to 6, characterized in that each orifice (10) of the silo bottom is disposed in the center of a set of radiating porous fluidization ducts (11).
EP84101062A 1983-01-05 1984-02-02 Arrangement for storing and homogenizing pulverulent material Expired - Lifetime EP0150249B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR8300113A FR2538794B1 (en) 1983-01-05 1983-01-05 POWDER PRODUCTS STORAGE AND HOMOGENIZATION ASSEMBLY
DE8484101062T DE3468398D1 (en) 1984-02-02 1984-02-02 Arrangement for storing and homogenizing pulverulent material
EP84101062A EP0150249B2 (en) 1983-01-05 1984-02-02 Arrangement for storing and homogenizing pulverulent material

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8300113A FR2538794B1 (en) 1983-01-05 1983-01-05 POWDER PRODUCTS STORAGE AND HOMOGENIZATION ASSEMBLY
EP84101062A EP0150249B2 (en) 1983-01-05 1984-02-02 Arrangement for storing and homogenizing pulverulent material

Publications (3)

Publication Number Publication Date
EP0150249A1 EP0150249A1 (en) 1985-08-07
EP0150249B1 true EP0150249B1 (en) 1988-01-07
EP0150249B2 EP0150249B2 (en) 1991-04-24

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EP (1) EP0150249B2 (en)
FR (1) FR2538794B1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN103538825A (en) * 2013-11-12 2014-01-29 侯如升 Manual discharging device of fodder mixing machine

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Publication number Priority date Publication date Assignee Title
DE3501612A1 (en) * 1985-01-18 1986-07-24 Krupp Polysius Ag, 4720 Beckum Method of discharging bulk materials from a hopper
DE19838956A1 (en) * 1998-08-27 2000-03-02 Tridelta Siperm Gmbh Device for introducing a fluidizing agent into a container
CN112707660B (en) * 2020-12-26 2022-05-24 黑河关鸟河水泥有限责任公司 Preparation method of composite portland cement

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US2665035A (en) * 1948-12-27 1954-01-05 Huron Portland Cement Company Aerating device for pulverulent material
GB1027680A (en) * 1964-01-08 1966-04-27 Carmichael And Sons Worcester Pneumatic apparatus for facilitating the discharge from containers of powdery and granular matter
US3563610A (en) * 1969-01-15 1971-02-16 Halliburton Co Apparatus for mixing and unloading pulverulent material
DE2724928C2 (en) * 1977-06-02 1983-07-07 Ibau Hamburg Ingenieurgesellschaft Industriebau Mbh, 2000 Hamburg Large-capacity silo for flour-like bulk goods
DE2844589C2 (en) * 1978-10-13 1986-07-17 Ibau Hamburg Ingenieurgesellschaft Industriebau Mbh, 2000 Hamburg Silo for storing and mixing bulk goods
DE2949821A1 (en) * 1979-12-12 1981-06-19 Ibau Hamburg Ingenieurgesellschaft Industriebau Mbh, 2000 Hamburg Large bulk cement type storage silo - has mixer silo covering stop slides ring chamber around homogenisation silo
DE3022346C2 (en) * 1980-06-14 1982-07-08 Claudius Peters Ag, 2000 Hamburg Mixing silo for bulk goods

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103538825A (en) * 2013-11-12 2014-01-29 侯如升 Manual discharging device of fodder mixing machine

Also Published As

Publication number Publication date
FR2538794B1 (en) 1986-03-28
FR2538794A1 (en) 1984-07-06
EP0150249A1 (en) 1985-08-07
EP0150249B2 (en) 1991-04-24

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