EP0442788A2 - Zentrifugal wirkender Windsichter - Google Patents

Zentrifugal wirkender Windsichter Download PDF

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Publication number
EP0442788A2
EP0442788A2 EP91400310A EP91400310A EP0442788A2 EP 0442788 A2 EP0442788 A2 EP 0442788A2 EP 91400310 A EP91400310 A EP 91400310A EP 91400310 A EP91400310 A EP 91400310A EP 0442788 A2 EP0442788 A2 EP 0442788A2
Authority
EP
European Patent Office
Prior art keywords
rotor
blades
particles
envelope
guide vanes
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
EP91400310A
Other languages
English (en)
French (fr)
Other versions
EP0442788A3 (en
EP0442788B1 (de
Inventor
Alain Cordonnier
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.)
F C B
Original Assignee
F C B
Fives Cail Babcock 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
Application filed by F C B, Fives Cail Babcock SA filed Critical F C B
Publication of EP0442788A2 publication Critical patent/EP0442788A2/de
Publication of EP0442788A3 publication Critical patent/EP0442788A3/fr
Application granted granted Critical
Publication of EP0442788B1 publication Critical patent/EP0442788B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Definitions

  • the subject of the present invention is a selector intended to separate from a stream of solid particles suspended in a gas stream the particles whose size is greater than a predetermined dimension and comprising guide vanes arranged along the generatrices of a fictitious cylinder , with vertical axis, and able to communicate to the current of gas entering said imaginary cylinder, a rotational movement around the axis of the cylinder, a rotor placed inside said imaginary cylinder, the axis of which coincides with that of cylinder and which is provided with vertical blades regularly distributed over its periphery, and a central outlet orifice disposed above or below the rotor and through which is drawn the stream of gas charged with particles whose dimensions are smaller than said dimension predetermined.
  • the particles suspended in the gas stream are subjected to two opposing forces: a centrifugal force resulting from the rotational movement and a drag force due to the centripetal flow of the gas stream towards the outlet orifice central. Large particles are separated at the outer cylindrical surface of the rotor. If the distribution of the gas stream over the entire height of the turbine is uniform, there is only one critical particle diameter or cut-off diameter corresponding to one particle in equilibrium on the outer surface of the rotor.
  • Particles with a diameter greater than the critical diameter are rejected against the guide vanes by centrifugal force and fall by gravity into a collecting hopper placed under the vanes; while the particles of diameter smaller than the critical diameter are entrained by the gas current through the rotor towards the central exit orifice.
  • the rotor is equipped with blades of small width arranged on its periphery and, in operation, a vortex is formed in the center of the rotor in which a significant part of the kinetic energy of the gas stream is dissipated.
  • the object of the present invention is to improve the performance and to reduce the energy consumption of a selector of this type by provisions making it possible to overcome the turbulence of the flow between the guide vanes and the rotor and to avoid the formation of a vortex in the rotor.
  • the selector object of the present invention is characterized in that the rotor has a second set of blades, arranged between the peripheral blades and the axis, and serving to guide the gas streams to the central outlet of the rotor. charged with fine particles leaving the peripheral blades.
  • the blades of this second set extend over the entire height of the rotor and can be arranged in radial planes or be inclined relative to these planes. They can be flat or have a certain curvature, and can be formed by an extension towards the axis of the peripheral blades.
  • the central part of the terminal wall of the rotor opposite the outlet orifice may have a profiled shape, for example frustoconical, favoring the flow of gas towards the outlet orifice.
  • the channels delimited by the peripheral blades of the rotor a section which increases from the outside towards the inside of the rotor, so that the centrifugal and drag forces acting on the grains whose diameter is equal to the cut-off diameter balance practically over the entire length of said channels.
  • the guide vanes and the rotor are enclosed in an envelope which delimits, around the guide vanes, an annular chamber in which the gas stream and possibly the materials to be sorted are admitted.
  • the gas stream can be admitted into this chamber tangentially or parallel to the axis of the device, from below.
  • the raw materials can be suspended in the gas stream before it enters said chamber or introduced separately, from above, into the space between the rotor and the guide vanes; these two feeding modes can also be used simultaneously.
  • a hopper in the form of an inverted cone is placed under the rotor and the directional vanes, to collect the particles whose dimensions are greater than the cut-off diameter, the envelope is of revolution, concentric to the rotor and also surrounds said hopper by providing around it a passage with annular section, and a vertical duct is connected to the bottom of said casing, under said hopper and coaxially with it, to bring the gas stream charged with particles to sort in said chamber, through said passage; in the plane where said conduit opens into said envelope, the diameter of the latter is significantly greater than that of said so that the gases loaded with particles are subjected, when entering said envelope, to an expansion promoting the fall of heavy particles in the envelope background.
  • Said conduit may extend upwards above the bottom of the envelope and delimit therewith an annular volume in which the large particles separated from the air stream will be collected in the expansion zone thus created, the bottom of said envelope being preferably inclined and provided at its lowest point with an orifice for discharging said particles.
  • One or more deflectors constituted by flat or frustoconical rings can be fixed on the outside of said hopper to deflect the gas stream and promote the separation of large particles.
  • the selector shown in the drawings comprises a casing 10 constituting the body of the apparatus and formed of a cylindrical upper part, of an intermediate part in the form of an inverted truncated cone, of a cylindrical lower part connecting to the small base of the truncated cone and of an inclined bottom comprising, at its lowest point, an evacuation orifice 12.
  • a conduit for admission of the gases laden with particles to be sorted 14 crosses the bottom of the envelope and extends upwards approximately to the junction plane of the intermediate parts and lower.
  • the conduit 14 is arranged coaxially with the envelope and its end is flared.
  • the envelope is closed by a cover 16 comprising a central opening at the edge of which is connected a gas evacuation duct 18.
  • a rotor 20 is placed in the upper part of the envelope, coaxial with it. It is fixed to the lower end of a vertical shaft 22 mounted, by means of rolling bearings, in a tubular support 24 fixed on the cover 16.
  • the shaft is coupled to a variable speed control group 26 allowing the rotor to rotate at the desired speed.
  • the rotor 20 has a large number of vertical blades 28 regularly spaced around its periphery.
  • the lower and upper ends of the blades are fixed, respectively, on a bottom 30 formed by a flat ring and a central truncated cone integral with the shaft 22, and on a ring 32.
  • a baffle joint 34, integral of the cover 16, ensures sealing between the latter and the rotor.
  • the blades 28 have as plane of symmetry a plane containing the axis of the rotor and, as can be seen in FIG. 3, the channels formed between the blades have a width which increases from the outside towards the inside of the rotor (L1 ⁇ L2) so that the centrifugal force and the drag force acting on a particle of critical diameter (cut-off diameter) are balanced almost over the entire length of the canals.
  • the profile of the blades can be easily determined from these mathematical formulas translating the equality of the centrifugal and drag forces acting on a particle of given density and diameter, with a given speed of the rotor.
  • the equilibrium conditions can be satisfied, with a given blade profile, for different cutoff diameters, by adopting different rotational speeds for the rotor.
  • the blades 28 could form an angle with the radial planes, the width of the channels delimited by the blades always increasing progressively from the outside to the inside.
  • the rotor further comprises a second set of blades 35, arranged between the blades 28 and the axis of the rotor.
  • the blades 35 are constituted by flat sheets, located in vertical planes containing the axis of the rotor, and fixed on the frustoconical central part of the bottom 30 and on the upper ring 32. These blades have for purpose of avoiding the formation of a vortex inside the rotor and make it possible to recover a significant part of the energy of the gas current passing through the rotor.
  • the blades 35 could be inclined and / or form an angle with the planes containing the axis of the rotor, they could also be profiled in the manner of the blades of a turbine.
  • the rotor thus formed can be compared to the rotor of a centrifugal compressor which would operate as a receiving turbomachine taking energy from a continuous flow of fluid to transform it into mechanical energy.
  • This construction of the rotor makes it possible to eliminate the vortex, which would form inside the rotor if the latter were devoid of the blades 35, and consequently, to recover the energy which would otherwise be lost in the vortex and, by reduction of gas speed, decrease abrasion wear and pressure drop.
  • the rotor is surrounded by a circular row of vertical guide vanes 36 regularly spaced around the rotor. These blades are provided at their ends with pivots 38 housed in holes of an upper ring 40 fixed on the upper end of the casing and of a lower ring 42 mounted on the upper edge of a frustoconical hopper 44 placed under the rotor, in the frustoconical part of the envelope, and supported by feet 46 fixed on the envelope.
  • the upper pivots are provided with levers 48 connected together by a hoop so that, whatever their orientation, all the blades form the same angle with the respective radial plane.
  • An actuator acting on the hoop allows to adjust the orientation of the blades remotely.
  • the stream of gas charged with the particles to be sorted flows from bottom to top in the pipe 14. When it reaches the upper end of the pipe, it is subjected to a sudden expansion due to the large difference in the diameters of the pipe and of the envelope that surrounds it at this level. This results in a decrease in the speed of the gas which allows the largest particles to fall to the bottom of the envelope, in the annular space formed between the end of the duct and the envelope, and to be evacuated by the orifice 12.
  • One or more deflectors 50 can be fixed on the hopper 44, above the duct 14, to improve this separation.
  • the gas stream then rises to the upper part of the casing 10, maintaining an almost constant speed, then flows between the vanes 36, which give it a circular movement, and enters the rotor through the channels formed between the blades 28.
  • the particles whose dimensions are smaller than the cut-off diameter are entrained in the rotor by the gas stream and evacuated therewith by the conduit 18 which is connected to the suction opening of a fan through a dust collector to separate particles from the gas stream. Particles larger than the cut-off diameter are kept outside the rotor by centrifugal force and fall by gravity into the hopper 44, through an annular slot formed between the rotor and the ring 42.
  • At least part of the particles to be sorted could be introduced by one or more inlets 17 disposed above the ring 32 of the rotor and projected by centrifugal force against a skirt surrounding the ring 32 to then fall into the space between the blades 36 and the rotor and be suspended in the gas stream flowing transversely.
  • the cut-off diameter depends, for a given gas flow, on the speed of rotation of the rotor. This is maintained at the value chosen by regulating the speed of the motor 26. Since, thanks to the provisions of the invention, the power transmitted to the rotor by the gas current which passes through it can be greater than that which is necessary to make it rotate at the set speed, the motor 26 must be able to operate as a brake with speed regulation.
  • the orientation of the blades 36 is adjusted, as a function of the speed of the rotor, so that the tangential component of the speed of the gas and of the particles at the periphery of the rotor is approximately equal to the peripheral speed of the rotor; this setting can be made manually or automatically. This measurement makes it possible to avoid impacts of the particles on the blades of the rotor and to obtain a homogeneous fluid speed over the entire width of the channels between blades of the rotor.
  • the gas stream could be admitted tangentially into the envelope, at the level of the vanes 36.
  • the increase in cross section, from the inlet to the outlet, of the channels formed between the blades of the rotor is achieved exclusively by increasing their width.

Landscapes

  • Centrifugal Separators (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Separating Particles In Gases By Inertia (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Cyclones (AREA)
EP91400310A 1990-02-13 1991-02-08 Zentrifugal wirkender Windsichter Expired - Lifetime EP0442788B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9001673 1990-02-13
FR9001673A FR2658096B1 (fr) 1990-02-13 1990-02-13 Selecteur a air a action centrifuge.

Publications (3)

Publication Number Publication Date
EP0442788A2 true EP0442788A2 (de) 1991-08-21
EP0442788A3 EP0442788A3 (en) 1991-09-18
EP0442788B1 EP0442788B1 (de) 1994-09-21

Family

ID=9393649

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91400310A Expired - Lifetime EP0442788B1 (de) 1990-02-13 1991-02-08 Zentrifugal wirkender Windsichter

Country Status (15)

Country Link
US (1) US5120431A (de)
EP (1) EP0442788B1 (de)
JP (1) JP2575961B2 (de)
AT (1) ATE111780T1 (de)
AU (1) AU629732B2 (de)
CA (1) CA2036158C (de)
CZ (1) CZ281227B6 (de)
DE (1) DE69104081T2 (de)
DK (1) DK0442788T3 (de)
ES (1) ES2062703T3 (de)
FR (1) FR2658096B1 (de)
PL (1) PL165794B1 (de)
RU (1) RU2036027C1 (de)
SK (1) SK279035B6 (de)
ZA (1) ZA911053B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0645196A1 (de) 1993-03-31 1995-03-29 Onoda Cement Company, Ltd. Wirbelwindsichter
FR2741286A1 (fr) * 1995-11-21 1997-05-23 Fcb Separateur a air a action centrifuge
EP3461565A1 (de) * 2016-04-11 2019-04-03 Neumann & Esser Process Technology Gmbh Sichter
CN111085428A (zh) * 2019-12-19 2020-05-01 河北科技大学 用于3d打印金属粉末分级的涡流选粉机

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DE4126976C1 (de) * 1991-08-14 1993-01-07 Kuenkel-Wagner Gmbh & Co Kg, 3220 Alfeld, De
US5301812A (en) * 1993-04-02 1994-04-12 Ecc International Inc. Air classifying apparatus with wear reducing deflector
AT401741B (de) * 1993-08-19 1996-11-25 Thaler Horst Dipl Ing Windsichter
US5938045A (en) * 1996-01-12 1999-08-17 Ricoh Company, Ltd. Classifying device
US5884776A (en) * 1997-04-04 1999-03-23 The Babcock & Wilcox Company Dynamic classifier with hollow shaft drive motor
DE10044102C2 (de) * 2000-09-07 2003-04-17 Roland Nied Sichtrad für Windsichter
US7028847B2 (en) * 2003-05-29 2006-04-18 Alstom Technology Ltd High efficiency two-stage dynamic classifier
US7118055B2 (en) * 2004-04-19 2006-10-10 Jin-Hong Chang Grinding mill
NO321643B1 (no) * 2004-05-18 2006-06-19 Comex As Partikkelseparator
US8523963B2 (en) 2004-10-12 2013-09-03 Great River Energy Apparatus for heat treatment of particulate materials
US7540384B2 (en) * 2004-10-12 2009-06-02 Great River Energy Apparatus and method of separating and concentrating organic and/or non-organic material
US8062410B2 (en) 2004-10-12 2011-11-22 Great River Energy Apparatus and method of enhancing the quality of high-moisture materials and separating and concentrating organic and/or non-organic material contained therein
US8579999B2 (en) 2004-10-12 2013-11-12 Great River Energy Method of enhancing the quality of high-moisture materials using system heat sources
US7987613B2 (en) 2004-10-12 2011-08-02 Great River Energy Control system for particulate material drying apparatus and process
US7275644B2 (en) 2004-10-12 2007-10-02 Great River Energy Apparatus and method of separating and concentrating organic and/or non-organic material
US7413084B2 (en) * 2004-10-19 2008-08-19 Wegner Paul C Method and system for separating particulate matter
JP4522286B2 (ja) * 2005-02-17 2010-08-11 三菱電機株式会社 脱臭装置
DE102006044833B4 (de) * 2006-09-20 2010-01-21 Babcock Borsig Service Gmbh Zentrifugalsichter und Verfahren zum Sichten
TWI483787B (zh) * 2007-09-27 2015-05-11 Mitsubishi Hitachi Power Sys A grading device and an upright pulverizing device having the classifying device and a coal fired boiler device
DE102008038776B4 (de) 2008-08-12 2016-07-07 Loesche Gmbh Verfahren zur Sichtung eines Mahlgut-Fluid-Gemisches und Mühlensichter
FR2941389B1 (fr) 2009-01-29 2011-10-14 Fives Fcb Dispositif de separation granulometrique selective de matieres pulverulentes solides, a action centrifuge, et procede d'utilisation d'un tel dispositif
FR2959679B1 (fr) * 2010-05-05 2015-02-20 Fives Fcb Procede de broyage d'une matiere minerale contenant au moins du calcium et des impuretes metalliques, et installation convenant pour le broyage d'une matiere minerale contenant du calcium et des impuretes metalliques en tant que tels.
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
US9211547B2 (en) 2013-01-24 2015-12-15 Lp Amina Llc Classifier
CN103285997A (zh) * 2013-05-22 2013-09-11 江苏新业重工股份有限公司 一种粗粉分离器
DE102013021757A1 (de) * 2013-12-20 2015-06-25 Netzsch Trockenmahltechnik Gmbh Maschine mit fliegend gelagertem Rotor
US9463491B2 (en) * 2013-12-30 2016-10-11 Hollison, LLC Aerosol particle separation and collection
US10744534B2 (en) 2016-12-02 2020-08-18 General Electric Technology Gmbh Classifier and method for separating particles
DE102016015051B4 (de) * 2016-12-16 2019-01-31 Hosokawa Alpine Aktiengesellschaft Sichtrad für einen Zentrifugalkraft-Windsichter
JP7175601B2 (ja) * 2017-11-02 2022-11-21 三菱重工業株式会社 粉砕機及び粉砕機の運転方法
CN107931120B (zh) * 2017-12-29 2024-04-26 江苏菲特滤料有限公司 一种颗粒物分离设备
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
DE102022104496A1 (de) * 2022-02-24 2023-08-24 Börger GmbH Rotationsabscheider zum Abscheiden von Fremdkörpern aus einer Medienströmung

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FR2597766A1 (fr) * 1986-04-28 1987-10-30 Onoda Cement Co Ltd Dispositif pour le tri par centrifugation de matieres pulverulentes

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0645196A1 (de) 1993-03-31 1995-03-29 Onoda Cement Company, Ltd. Wirbelwindsichter
FR2741286A1 (fr) * 1995-11-21 1997-05-23 Fcb Separateur a air a action centrifuge
WO1998046371A1 (fr) * 1995-11-21 1998-10-22 Fcb Separateur a air a action centrifuge
EP3461565A1 (de) * 2016-04-11 2019-04-03 Neumann & Esser Process Technology Gmbh Sichter
CN113042368A (zh) * 2016-04-11 2021-06-29 诺曼艾索工艺技术有限公司 分选机
US11117167B2 (en) 2016-04-11 2021-09-14 Neuman & Esser Process Technology Gmbh Separator
CN111085428A (zh) * 2019-12-19 2020-05-01 河北科技大学 用于3d打印金属粉末分级的涡流选粉机

Also Published As

Publication number Publication date
AU629732B2 (en) 1992-10-08
FR2658096A1 (fr) 1991-08-16
DE69104081T2 (de) 1995-04-13
RU2036027C1 (ru) 1995-05-27
ES2062703T3 (es) 1994-12-16
SK279035B6 (sk) 1998-05-06
CA2036158C (fr) 1999-07-13
DE69104081D1 (de) 1994-10-27
DK0442788T3 (da) 1995-02-20
US5120431A (en) 1992-06-09
EP0442788A3 (en) 1991-09-18
CA2036158A1 (fr) 1991-08-14
ZA911053B (en) 1991-11-27
FR2658096B1 (fr) 1992-06-05
CZ281227B6 (cs) 1996-07-17
AU7092891A (en) 1991-08-15
EP0442788B1 (de) 1994-09-21
PL165794B1 (pl) 1995-02-28
JP2575961B2 (ja) 1997-01-29
JPH04215875A (ja) 1992-08-06
ATE111780T1 (de) 1994-10-15
CS9100328A2 (en) 1991-09-15

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