EP2382056B1 - Dispositif de séparation granulométrique sélective de matières pulvérulentes solides, à action centrifuge, et procédé d'utilisation d'un tel dispositif - Google Patents

Dispositif de séparation granulométrique sélective de matières pulvérulentes solides, à action centrifuge, et procédé d'utilisation d'un tel dispositif Download PDF

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Publication number
EP2382056B1
EP2382056B1 EP10705898.4A EP10705898A EP2382056B1 EP 2382056 B1 EP2382056 B1 EP 2382056B1 EP 10705898 A EP10705898 A EP 10705898A EP 2382056 B1 EP2382056 B1 EP 2382056B1
Authority
EP
European Patent Office
Prior art keywords
rotor
housing
vanes
blades
gas flow
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.)
Revoked
Application number
EP10705898.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2382056A1 (fr
Inventor
Sébastien DEVROE
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.)
Fives FCB SA
Original Assignee
Fives FCB SA
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Filing date
Publication date
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Application filed by Fives FCB SA filed Critical Fives FCB SA
Priority to PL10705898T priority Critical patent/PL2382056T3/pl
Publication of EP2382056A1 publication Critical patent/EP2382056A1/fr
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Revoked legal-status Critical Current
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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
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
    • 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
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
    • B07B4/04—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall in cascades

Definitions

  • the present invention relates to a device for separating granulometric selective solid pulverulent materials, centrifugal action, and a method of using such a device.
  • This type of device makes it possible to separate a stream of particles present in a stream of gas in two fractions, one fine smaller than a given particle size, the other coarse larger than said particle size.
  • Such a device is also referred to in the corresponding industrial environment "Centrifugal air selector”.
  • the separation is carried out using a cylindrical rotor with vertical axis, provided with blades regularly distributed on its periphery, and between which the particles are subjected to antagonistic forces, namely, on the one hand, the centrifugal force generated by the rotation of the rotor and which tends to reject them, and secondly, the drag force generated by the speed of a gas sucked towards the center of the rotor, and which tends to drive with him towards the exit of said gas .
  • the centrifugal force is higher for the larger sized particles and the higher drag force for the smaller sized particles, which achieves granulometric selection of the treated materials.
  • Substances having dimensions smaller than a determined selection particle size are thus entrained with the gas towards the outlet of said gas, while the materials with dimensions greater than said determined particle size fall back and are collected in a gravitational manner.
  • the feed of the materials to be treated can be carried out both by the upper part in a gravitational manner, in which case the materials are generally dispersed by a rotating plate integral with the rotor, or a suspension in the incoming gas, or by combining the two previous feeding modes.
  • the collection of materials whose dimensions are greater than the determined grain size of selection is carried out via an inverted cone-shaped hopper, located under the rotor.
  • the walls of the hopper must have a significant slope relative to the horizontal, generally 50 to 60 °, to ensure the gravity flow of the materials towards the outlet, at the tip of the cone. This slope determines the height of the conical hopper, which constitutes a substantial part of the height of the complete apparatus. The height of this hopper can not be reduced and may pose problems of integration in some facilities.
  • this lower hopper requires to provide motorization of the rotor at the top of the device.
  • the gas outlet is immediately followed by a bend in order to position the rotor motor above this elbow.
  • This configuration however requires to provide the rotation shaft connecting the motor and the rotor of sufficient length to be able to cross the elbow. Inside this bend, the rotation shaft must be protected by a sheath whose outer coating, specific, must resist abrasion.
  • Another disadvantage of this type of apparatus is that the separation between the grains of smaller and larger dimensions is not perfect, a portion of the fine grains, less than said determined particle size, falling with the larger grains in the hopper.
  • selection bypass The rate of said fine grains rejected with the coarse materials is commonly called "selection bypass” and constitutes an imperfection.
  • This imperfection can be the result of a group effect, the fine grains, attached to larger grains, being rejected by the rotor, thus falling in the hopper, or even a poor supply of powdery materials in the device.
  • the object of the present invention is to overcome all or part of the aforementioned drawbacks.
  • the object of the present invention is to provide such a device, or even a method, for reducing the selection bypass, namely the rate of fines rejected with coarse materials.
  • Another object of the present invention may be to propose a size separation device of limited size in height.
  • Another object of the present invention may be to provide such a device whose rotor motor architecture is substantially simplified.
  • said collection means comprise a fluidized bed peripheral system, the bed of which extends around the axis of said cylindrical rotor, at least below said blades and the inter-space between said blades and said blade. rotor, the velocity of the fluidization gas in a horizontal section of the fluidized bed being less than 1 m / s so as to produce a new separation between the fines and the coarse materials for which said fines are returned to inter-space between said vanes and said rotor.
  • the invention also relates to a method of using a granulometric separation device according to the invention in which a fraction of pulverulent material is introduced into said envelope between the blades and the rotor of the device and is divided, of a on the other hand, in a fraction of fine material, of particle size smaller than a determined particle size, entrained by said gaseous flow returning through the rotor towards the outlet, in particular an upper outlet, of the device and, on the other hand, in a coarse fraction, of dimension of particles greater than said determined particle size, rejected by the rotor to said means for collecting the device, in which method the average velocity of fluidization air is determined in a horizontal section of the fluidized bed less than 1 m / second and in such a way as to minimize in the discharges the rate of particles smaller than said determined particle size.
  • the figure 1 is a diagram illustrating a separation device of the state of the art.
  • This device 1 ' comprises an envelope 6', inside which a rotor 2 ', provided with blades 3' on its periphery, can rotate about a vertical axis of rotation.
  • the blades guide a gas flow towards the blades 3 'to the center of the rotor.
  • the blades are provided with pivots, along a vertical axis, which allow their movement in order to adjust their orientation to adapt the speed of the gases reaching the rotor to the speed of rotation of the rotor.
  • the pivots of all the guide vanes are connected to the same device for simultaneously orienting all the blades at the same angle relative to the peripheral surface of the rotor.
  • a hopper 10 ' arranged lower than the rotor and the blades of the device, allows the collection of dropped materials, rejected by the rotor, while the materials entrained by the aspirated gases, are discharged through the outlet 9'.
  • This output 9 ' is immediately followed by a bend 90' to allow the positioning of the motor of the rotor above this elbow.
  • the rotation shaft 21 ' belonging together with the rotor and its motor (not shown), crosses the bend inside which it is protected. by a sheath 22 '.
  • the gas supply of the device is performed by the envelope 6 'and by a vertical sheath 5' extending said envelope 6 'downwardly including the hopper 10'.
  • the materials to be sorted may be suspended in the fed gas stream, or may be discharged at the top of the rotor at points of introduction 8 '.
  • the hopper 10 ' has a substantial height for the device, and thus participates in the overall height.
  • the hopper also forces the motor to be positioned above the rotor 2 '.
  • blades 7 are fixed relative to the casing 6 that they do not rotate with the blades 3 of the rotor.
  • These vanes are nevertheless possibly adjustable in order to adapt the speed of the gas reaching the rotor to the rotational speed of said rotor.
  • the vanes 7 may be provided with pivots along a vertical axis, the pivots of all the guide vanes being connected to the same device which makes it possible to orient, at the same time, all the vanes at the same angle with respect to the peripheral surface of the rotor.
  • said collection means 10 comprise a fluidized bed peripheral system, the bed of which extends around the axis A of said cylindrical rotor 2, at least below said blades 7 and below the inter-space between said blades 7 and the rotor 2.
  • the velocity of the fluidization gas in a horizontal section of the fluidized bed is less than 1 m / s, in particular between 30 and 50 mm / s, so as to produce a new separation between the fine materials and the coarse materials for which said fine materials are returned in the inter gap between said blades 7 and said rotor 2.
  • the peripheral fluidized bed system may comprise a trough 11 forming a peripheral corridor, the bottom of said corridor having means 16, 17, 18 for blowing air.
  • Said trough 11 in a substantially horizontal plane, is constructed in such a way as to constitute said fluidized bed for the granular materials thus collected.
  • the air blowing means may take the form of a porous wall 18, such as a fabric, defining the bottom of said trough downstream of a plenum 17 provided with a gas supply 16.
  • the air blowing means can take the form of a plurality of nozzles, especially metal, distributed on the bottom of said trough, in front of a plenum provided with a gas supply.
  • the peripheral channel of said trough may consist of a set of straight troughs, placed end to end, in a polygonal configuration.
  • the device may have means for discharging the collected materials into said trough in one or more collectors 22.
  • these means may take the form of an overflow, an underflow, withdrawal means, or other .
  • each straight gutter of the polygon may have a slight slope, the sections of the corridor thus constituting so many airslides.
  • a collector may be provided at the bottom of each of said airslides to collect the granular material.
  • FIG. figure 2 it is a collector 22 inside the peripheral corridor.
  • the materials are evacuated from the peripheral corridor by overflow or overflow.
  • the collector (s) 22 can thus be located inside the peripheral corridor, as illustrated in FIG. figure 2 , positioned on the peripheral corridor notably at the corners of a polygon, or else provided outside the peripheral corridor.
  • the handling device 23 may be an airlifter, or a mechanical conveyor such as Archimedes screw, a chain conveyor, a vibrating corridor, a conveyor belt or others.
  • the outlet 14 of the collecting means 10 may be at a reduced vertical distance relative to the position of the rotor.
  • the material fed into said casing 6 can be provided with the gas stream returning in the form of a suspension.
  • the feed material may be brought gravity over the rotor and be dispersed by a rotating plate 24 integral in rotation with the rotor. In all cases, the fed material arrives in large quantity in the zone between the vanes and the blades of the rotor, zone where the great part of the selection is made.
  • the example of figure 2 comprises a rotor 2 of cylindrical shape with vertical axis A provided at its periphery with blades 3 regularly spaced.
  • the rotor 2 is traversed by a gaseous stream loaded with particles, which penetrates through its lateral surface and exits at the center of its upper base in an axial direction towards the outlet 9.
  • the other lower base 25 is completely closed.
  • the rotor 2 is driven by a motor assembly via: a vertical shaft 26.
  • the particles are subjected to the centrifugal force which opposes their entry through the blades 3 while the speed of the gas prints a drag force which drives the particles towards the center.
  • the balance between the two forces is such that the finer particles are entrained with the gas to the outlet 9 while the coarse particles are rejected by the rotor and fall to be collected by the collection means 10.
  • the collection means 10 comprise a peripheral fluidized bed system whose bed extends around the axis A of the cylindrical rotor 2 at least below the vanes 7 and below the inter space between said vanes 7 and the rotor 2 of the device. Making the bed thus covers said inter space between the vanes 7 and the blades 3 of the rotor, inter space from which falls the majority of non-driven materials, rejected by the rotor.
  • the rotor 2 is surrounded by a row of regularly spaced vertical vanes 7 arranged in a virtual cylinder. These blades are provided with pivots, according to a vertical axis, which allow their movement in order to to adjust their orientation to adapt the speed of the gas reaching the rotor to the speed of rotation of the rotor.
  • the pivots of all the vanes 7 are connected to the same device which makes it possible to orient at the same time all the vanes at the same angle with respect to the peripheral surface of the rotor.
  • the rotor 2 is also provided with blades 27 situated between the peripheral blades 3 and the shaft 26, serving to guide the gas veins issuing from the peripheral blades 3 towards the outlet orifice, thus avoiding the formation of a vortex at inside the rotor.
  • the material supplied to the rotor 2 is supplied by higher points of introduction 81 and is dispersed by a plate 24. Part of the pulverulent materials can also be provided with the gas stream 51. The dispersed materials, or else suspended in the gas flow are sorted for the most part in the inter-space between the vanes and the rotor.
  • the feed means of a gas flow are constituted by said envelope 6 as well as a vertical sheath 5 extending said envelope 6 downwards.
  • the vertical casing / sheath assembly thus encompasses, from bottom to top, said collection means 10, as well as the blade 7 / cylindrical rotor assembly 2.
  • the collection means 10 comprise a trough forming a peripheral corridor consisting of a succession of straight troughs, placed end to end.
  • the granular material is discharged from the fluidized bed by overflow.
  • the outer edge 21 of said trough is at a level higher than the inner edge 20, said inner edge constituting a discharge edge of materials to a manifold 22.
  • the collector 22 discharges the material through a handling device 23 horizontally, such as for example by an airslide.
  • figure 3 differs from that of the figure 2 by the shape of the supply means of a gas flow.
  • said supply means a gaseous flow are constituted by said casing 6 which surrounds the blade assembly 7 / cylindrical rotor 2, with the exception of said collection means 10 which remain free of access, especially in the case of maintenance.
  • Said blades 7 materialize the lateral surface of a virtual cylinder coaxial with the axis A of the cylindrical rotor 2.
  • the volume defined between the inner wall of said envelope 6 and the lateral surface of said virtual cylinder forms a volute.
  • the other elements of the device of the figure 3 are identical to those of the figure 2 .
  • the cross section of the volute, in each radial plane intersecting the axis of the rotor can be decreasing, especially linearly, depending on the center angle originating from the gas supply inlet 61.
  • the casing 6, forming the outer wall of the volute may have a double inclination with a lower inclined wall section 64, in particular at an angle to the horizontal greater than or equal to 30 °, and a vertical upper wall section 65.
  • the inclined bottom wall 64 allows, by its slope, to prevent the deposition of powdery materials and thus the formation of a layer of stagnant material in the volute.
  • the fluidized bed peripheral system may allow to leave an interior clearance to said system, for motorizing the retort from below with a much simpler implementation than a higher engine.
  • the overall height can be further limited by a rotation shaft 26 of reduced length.
  • the various sections forming the peripheral corridor of said trough 11 may have one or more slopes at the bottom of which one or more material collectors may be provided, as previously described.
  • the advantage of the invention lies in the arrangement and the method operating the collection means, more particularly the fluidized bed in order to reduce the bypass.
  • the velocity of the gas of the fluidized bed in a horizontal section may be less than 1 m / second, especially between 30 to 50 mm / s, so as to minimize the quantity of the finest particles entrained with the discharges. coarse.
  • This average fluidization air speed is determined so that a new sorting (new separation) takes place in which only the finest grains, smaller than the determined particle size, are entrained by the air escaping from the corridor, and returned to the stream of gas flow entering the inter space between the blades and blades of the device.
  • a new sorting new separation
  • some of the thinnest grains that were rejected during the first selection process by the rotor may return to the sorting area, ahead of the rotor.
  • the invention also relates to a method of using a device 1 for separating granulometric selective solid pulverulent materials, centrifugal action according to the invention, wherein is introduced a fraction of pulverulent materials in said envelope 6 between the blades and the rotor of the device and is divided, on the one hand, into a fraction of fine materials, of particle size smaller than a determined particle size, driven by said gas flow entering through the rotor to the outlet, in particular upper, the device, and secondly, in a fraction of coarse materials, of particle size greater than said determined particle size, rejected by the cylindrical rotor and falling in said collection means of the device.
  • the speed is determined medium of fluidization air in a horizontal section of the fluidized bed less than 1 m / s and so as to minimize in the discharges the rate of particles below said determined particle size.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Separating Particles In Gases By Inertia (AREA)
EP10705898.4A 2009-01-29 2010-01-26 Dispositif de séparation granulométrique sélective de matières pulvérulentes solides, à action centrifuge, et procédé d'utilisation d'un tel dispositif Revoked EP2382056B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL10705898T PL2382056T3 (pl) 2009-01-29 2010-01-26 Urządzenie do granulometrycznego selektywnego rozdzielania sproszkowanych substancji stałych, o działaniu odśrodkowym, i sposób zastosowania takiego urządzenia

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0900378A FR2941389B1 (fr) 2009-01-29 2009-01-29 Dispositif de separation granulometrique selective de matieres pulverulentes solides, a action centrifuge, et procede d'utilisation d'un tel dispositif
PCT/FR2010/000065 WO2010086528A1 (fr) 2009-01-29 2010-01-26 Dispositif de séparation granulométrique sélective de matières pulvérulentes solides, à action centrifuge, et procédé d'utilisation d'un tel dispositif

Publications (2)

Publication Number Publication Date
EP2382056A1 EP2382056A1 (fr) 2011-11-02
EP2382056B1 true EP2382056B1 (fr) 2014-07-23

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EP10705898.4A Revoked EP2382056B1 (fr) 2009-01-29 2010-01-26 Dispositif de séparation granulométrique sélective de matières pulvérulentes solides, à action centrifuge, et procédé d'utilisation d'un tel dispositif

Country Status (13)

Country Link
US (1) US9022222B2 (da)
EP (1) EP2382056B1 (da)
JP (1) JP5735925B2 (da)
CN (1) CN102300647B (da)
CA (1) CA2750690A1 (da)
DK (1) DK2382056T3 (da)
ES (1) ES2496716T3 (da)
FR (1) FR2941389B1 (da)
MX (1) MX2011007809A (da)
PL (1) PL2382056T3 (da)
RU (1) RU2513701C2 (da)
UA (1) UA102875C2 (da)
WO (1) WO2010086528A1 (da)

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CN103846126B (zh) * 2012-11-30 2016-03-30 黄立娜 档板自动调节高效串联双轴向动态分选、回粉碾磨装置
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DE102018008127B4 (de) 2018-10-13 2022-06-09 Hosokawa Alpine Aktiengesellschaft Blaskopf und Verfahren zur Herstellung einer Mehrschichtschlauchfolie
DE102018009632B4 (de) 2018-12-11 2021-12-09 Hosokawa Alpine Aktiengesellschaft Vorrichtung zum Aufwickeln und Wickelwechsel von bahnförmigem Material und ein Verfahren dafür
DE102019123034B3 (de) * 2019-08-28 2020-12-03 Khd Humboldt Wedag Gmbh Zyklon mit rotierendem Stabkorb
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CN112024125B (zh) * 2020-08-17 2022-03-22 常州大学 一种立式多级双驱耦合静电除尘器
CN113731609B (zh) * 2021-09-22 2022-09-02 南京雷昇新能源科技有限公司 用于制备高活性铁基含能复合材料的制备装置
CN115739628A (zh) * 2022-11-17 2023-03-07 成都利君实业股份有限公司 水平涡流三分离选粉机
CN116493258B (zh) * 2023-06-28 2023-09-05 绵阳九方环保节能科技有限公司 一种防积灰水平涡流选粉机

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Also Published As

Publication number Publication date
RU2011135816A (ru) 2013-03-10
CN102300647A (zh) 2011-12-28
DK2382056T3 (da) 2014-09-08
WO2010086528A1 (fr) 2010-08-05
FR2941389B1 (fr) 2011-10-14
US9022222B2 (en) 2015-05-05
MX2011007809A (es) 2011-09-21
CN102300647B (zh) 2013-12-25
JP2012516231A (ja) 2012-07-19
PL2382056T3 (pl) 2014-12-31
FR2941389A1 (fr) 2010-07-30
UA102875C2 (uk) 2013-08-27
CA2750690A1 (fr) 2010-08-05
JP5735925B2 (ja) 2015-06-17
RU2513701C2 (ru) 2014-04-20
US20110281713A1 (en) 2011-11-17
EP2382056A1 (fr) 2011-11-02
ES2496716T3 (es) 2014-09-19

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