EP0918573B1 - Separateur a air a action centrifuge - Google Patents

Separateur a air a action centrifuge Download PDF

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Publication number
EP0918573B1
EP0918573B1 EP97918235A EP97918235A EP0918573B1 EP 0918573 B1 EP0918573 B1 EP 0918573B1 EP 97918235 A EP97918235 A EP 97918235A EP 97918235 A EP97918235 A EP 97918235A EP 0918573 B1 EP0918573 B1 EP 0918573B1
Authority
EP
European Patent Office
Prior art keywords
rotor
blades
section
cross
channels
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97918235A
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German (de)
English (en)
French (fr)
Other versions
EP0918573A1 (fr
Inventor
Alain Cordonnier
Danielle Lemaire
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.)
FCB CIMENT
Original Assignee
FCB Ciment
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Filing date
Publication date
Application filed by FCB Ciment filed Critical FCB Ciment
Priority to DK97918235T priority Critical patent/DK0918573T3/da
Publication of EP0918573A1 publication Critical patent/EP0918573A1/fr
Application granted granted Critical
Publication of EP0918573B1 publication Critical patent/EP0918573B1/fr
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
    • 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
    • B07B11/04—Control arrangements

Definitions

  • the present invention relates to a pneumatic separator with centrifugal action intended to classify a granular material into a fine fraction and a coarse fraction and comprising a rotor with vertical axis provided with blades regularly distributed on its periphery, guide vanes arranged around the rotor, along the generatrices of a fictitious cylinder, and able to communicate with a current of air or other gas entering said fictitious cylinder a rotational movement around the axis of said cylinder, and an envelope in which are enclosed the rotor and the guide vanes and which is provided with one or more air inlets and for the material to be classified, an outlet orifice placed above or below the rotor and through which is drawn the air stream charged with the fine fraction of the material and at least one outlet for the coarse fraction, the air entering the rotor at its periphery, through the channels formed between the blades, and flowing inside the rotor towards the outlet.
  • the material to be classified and the air flow can be introduced separately inside the annular section space delimited by the blades and the rotor, or the material to be classified, can be suspended in the air stream before it is admitted into said space, through the blades; the air flow enters then in the rotor and is discharged through the outlet.
  • the air flow and the material to be classified are rotated, around the rotor axis, in the annular section space between the rotor and the blades guidelines.
  • the particles constituting the coarse fraction of the material are projected by the centrifugal force generated by this rotation against the guide vanes and fall by gravity in a collecting hopper with an outlet, while the particles constituting the fine fraction are entrained by the air flow through the rotor and the orifice central exit.
  • the separated fine fraction contains practically all the particles whose size is less than a first dimension while the coarse fraction contains practically all particles larger than a second dimension, larger than the first.
  • both fractions contain particles whose size is included between the first and second dimensions. This results in a sharing curve comprising two substantially horizontal portions connected by an inclined portion, the slope characterizes the separator.
  • the distribution of particles of intermediate size in one or other of the fractions characterizes the cutting precision of the separator.
  • the product we are looking for must have a particle size distribution different from that of the fraction, fine or coarse, obtained by means of a separator of this type. It is in particular the case of cement obtained by crushing by compression of the clinker. So far, the only solution to solve this problem was to use two separators placed in series or in parallel and adjusted for cut-off dimensions different. This solution is expensive.
  • document DE 90 17 176 describes a separator with centrifugal air, in which the air is separated into several streams.
  • the separator comprises a rotor assembly consisting of four coaxial units which have the same rotational speed. He is not possible to adjust the speed and / or the flow of the different air currents between them.
  • the separator comprises two rotors independent, which is an expensive solution, and more difficult to implement in action.
  • the purpose of the present invention is to improve the separators of the type concerned so that it is possible to adjust so simple the slope of the partition curve, i.e. to modify the distribution particle size of the size between the first and second dimensions.
  • the separator object of the invention is characterized in that it has a single rotor divided into sectors and in that the air circulating in the rotor between the inlet and the exhaust duct is divided into at least two separate currents, and in that the rotor is equipped with means for adjusting the speed and / or flow of at least one of the currents.
  • the drag forces exerted by the two currents on a particle of mass and given dimensions will be different; in the channels where the air flow travels at reduced speed, the balance between the drag forces and the forces centrifugal, which corresponds to the theoretical cutoff mesh, will occur for a smaller particle size than that for which this equilibrium is produced in other channels where the air speed is higher. Everything is will therefore pass as if we had two separators in parallel with different cutting meshes; by adjusting the velocities of the air currents, we will be able to adjust the cutoff meshes and, consequently, the distribution particle size distribution in the finished product.
  • the means for adjusting the speed and / or the flow of drafts can be formed by means for varying the inlet section of at least some of the channels formed between the blades of the rotor and / or by means for varying the cross section of the openings through which air currents escape from the rotor.
  • the rotor is divided in sectors by vertical partitions arranged radially and each sector communicates with the air outlet orifice through an opening provided with means for adjusting the passage section which may be formed, for example for example, by pivoting shutters or diaphragms; in this form of realization the radial partitions fulfill the anti-vortex function of the second set of blades of the separator object of French patent N ° 90 01673 in the name of applicant,
  • each plate being mobile, for example by rotation about an axis parallel to the axis of the rotor, between a first position where it leaves practically the entire section of the respective channel free, and a second position where it almost completely closes the canal.
  • certain blades of the rotor may be orientable around vertical axes. so that their ends can come to rest on a neighboring blade to seal the channel which they delimit.
  • Another solution is to make the blades in two parts: a fixed part and a mobile part, orientable by rotation around a vertical axis.
  • one of the faces of the blade can be fixed and the other mobile and able to pivot around a vertical axis located near the periphery of the rotor to come to rest on the neighboring blade to close the channel they form.
  • the radially outer part of the blade can be fixed and its inner part rotatable, the movable parts of two neighboring blades can be brought into abutment against each other to close the channel delimited by the two blades.
  • the separator object of the invention is of the type described in the French patent n ° 90.01673 to which one can refer for more details.
  • there comprises a rotor with vertical axis, guide vanes arranged around the rotor and a envelope in which the rotor and the guide vanes are enclosed and which is provided with a or several inlets for the product to be classified and for the air flow, one or more outlets for the coarse fraction and a central outlet for the air stream charged with the fine fraction of the product.
  • the rotor 10 is fixed to the lower end of a vertical shaft 11 mounted, by by means of rolling bearings, in a tubular support 12 fixed on the ceiling of the separator shell.
  • the shaft is coupled to a variable speed control group allowing the rotor to rotate at the desired speed.
  • the rotor has a large number of vertical blades 14 regularly spaced on its periphery and whose lower and upper ends are fixed, respectively, on a bottom 16 and on a ring 18.
  • a cylindrical shell 20 fixed on the inner edge of the ring 18 defines an outlet passage for the air charged with particles of small dimensions which have entered the rotor through the channels 15 formed between the blades 14.
  • This ferrule is connects, by a rotating joint, to the lower end of a through-pipe 22 the ceiling of the separator envelope.
  • the interior of the rotor is divided into four equal sectors by four vertical partitions 24 arranged radially. These partitions are fixed on the bottom 16, on the ring 18 and on a ferrule 26 surrounding the lower part of the tubular support 12 and itself fixed on the background 16.
  • the outlet opening delimited by the ring 18 and the ferrule 26 is partially closed by pivoting flaps 28 (two per sector in the embodiment shown).
  • Each flap is fixed on a shaft 30 mounted on bearings fixed on the ring 18 and the ferrule 26.
  • a square provided at the outer end of each shaft 30 makes it possible to adjust the orientation of the flaps and, therefore, the section of the exit opening of the respective sectors, and a system of locking keeps the shutters in the desired position after adjustment.
  • a blade 14 on two is formed by a fixed part 31 constituting the active face and a part mobile 32 orientable around a vertical axis 33 located near the leading edge of the blade (see figure 3).
  • This part 32 is movable, between a first position (represented by a line continuous in FIG. 3) where it is pressed against the fixed part 31 of the blade, so as to leave free entry of channel 15, and a second position (shown in dashed lines) where it closes completely this entry.
  • the orientation of the moving parts of the blades can be controlled individually or in groups.
  • Figure 4 shows another embodiment of the sealing means of certain rotor channels 15.
  • the two blades delimiting a channel are in two parts: an external part 31 ′ which is rigidly fixed to the structure of the rotor and a lower part 32 'which is able to pivot about a vertical axis 33'.
  • a mechanism for control not shown allows the movable part 32 ′ of each blade to be moved between two positions: a first position, shown in solid lines in FIG. 4, where the parts 31 ' and 32 'are in the extension of one another and the channel 15 is completely cleared, and a second position, shown in phantom, where the free ends of the parts 32 'of the two blades are in abutment against each other and the channel 15 is closed.
  • the means for closing the channels consist of pairs of vertical plates 40 placed inside the rotor, the two plates of a pair being articulated by their inner edge on the same vertical axis 42 disposed in the plane median of the canal.
  • a cam 44 placed between the two plates and controlled by a mechanism suitable allows to separate the two plates to bring their free end into abutment against the blades 14 and close the outlet of the channel 15, as shown in solid lines in the figure.
  • the cam is rotated to bring it into the median plane of the channel, the plates 40 are pressed against the cam by centrifugal force, as shown in dashed lines on the figure, and the outlet of channel 15 is almost completely clear.
  • certain blades 14 could be orientable being mounted so that it can pivot on the rotor around vertical axes located near their leading edge and come up against the neighboring fixed or orientable blades to close off the corresponding channels 15.
  • the separator In service, the separator is incorporated into a circuit, open or closed, where a gas stream, for example an air stream.
  • a gas stream for example an air stream.
  • the air flow divides into as many elementary currents as there are channels 15 between the blades 14.
  • these elementary currents are grouped in each sector of the rotor into four secondary currents which escape through the outlet opening delimited by the ring 18 and the ferrule 26. If all the flaps 28 are in the vertical position and if all the channels 15 are open, the flows of the four secondary currents are equal and the velocities of the currents elementary are equal; the operation of the separator is the same as that of a classic separator.
  • the speed air in the 15 open channels of the first sector will be, for these two reasons, more higher than in other sector channels. Since the drag forces which act on the particles and oppose the centrifugal force in the channels 15 depend the air speed, while the centrifugal forces depend only on the speed of rotation of the rotor, the particle size for which the centrifugal and drag forces are balanced (theoretical cutoff mesh) will be more important in the first sector than in the others.
  • FIG. 7 shows by way of example the partition curves of a conventional separator, for two cut-off links, and a separator according to the invention.
  • the sharing curve gives the weight proportion, expressed in%, of the particles of size given in the fraction coarse; we would get an inverted curve for the fine fraction.
  • the three curves are combined.
  • the dashed curve corresponds to a conventional separator whose theoretical cutoff mesh is 50 ⁇ m
  • the dotted one corresponds to a separator classic with a theoretical cutting mesh of 105 ⁇ m.
  • the solid line curve has been obtained with the separator of the invention; we see that its slope is lower than that of conventional separators, which means that in the 20-200 ⁇ m range, the particle size is more spread.
  • the invention therefore makes it possible to have a partition curve with adjustable slope and, by Therefore, to obtain a finished product having the desired particle size distribution in a particle size range given by varying both the speed of the rotor and the orientation of the guide vanes, on the one hand, and the positions of the flaps 28 and the adjustment of the section of the channels 15, on the other hand.
  • the rotor could be designed as shown in FIG. 6 and divided into two parts 46, 48, by a horizontal partition 50, located for example at mid-height, an opening 52 provided in the upper wall of the rotor communicating the upper part of the rotor with the air exhaust duct 22 of the separator and a ferrule 54 whose diameter is less than that of said opening 52 being connected to a central opening 56 of the partition and delimiting a passage 55 making communicate the lower part of the rotor with the exhaust duct 22 through the first opening.
  • the rotor is provided with means such as those illustrated in FIGS.
  • the rotor could be divided into more than two superimposed parts. We could even remove the horizontal partition (s), dividing the air in two or more currents in the rotor resulting from the arrangement of one or more dip tubes placed in the rotor axis.

Landscapes

  • Centrifugal Separators (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Glass Compositions (AREA)
  • Cyclones (AREA)
  • Lubricants (AREA)
EP97918235A 1995-11-21 1997-04-15 Separateur a air a action centrifuge Expired - Lifetime EP0918573B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK97918235T DK0918573T3 (da) 1995-11-21 1997-04-15 Vindsigte med centrifugal virkning

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9513764A FR2741286B1 (fr) 1995-11-21 1995-11-21 Separateur a air a action centrifuge
PCT/FR1997/000678 WO1998046371A1 (fr) 1995-11-21 1997-04-15 Separateur a air a action centrifuge

Publications (2)

Publication Number Publication Date
EP0918573A1 EP0918573A1 (fr) 1999-06-02
EP0918573B1 true EP0918573B1 (fr) 2004-06-30

Family

ID=26232337

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97918235A Expired - Lifetime EP0918573B1 (fr) 1995-11-21 1997-04-15 Separateur a air a action centrifuge

Country Status (14)

Country Link
US (2) US6273269B1 (cs)
EP (1) EP0918573B1 (cs)
JP (1) JP3999278B2 (cs)
AT (1) ATE270159T1 (cs)
AU (1) AU741249B2 (cs)
CA (1) CA2257674C (cs)
CZ (1) CZ292237B6 (cs)
DE (1) DE69729731T2 (cs)
DK (1) DK0918573T3 (cs)
ES (1) ES2224236T3 (cs)
FR (1) FR2741286B1 (cs)
PL (1) PL186138B1 (cs)
UA (1) UA63905C2 (cs)
WO (1) WO1998046371A1 (cs)

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FR2741286B1 (fr) * 1995-11-21 1998-01-23 Fcb Separateur a air a action centrifuge
US6840183B2 (en) * 1999-11-15 2005-01-11 Rickey E. Wark Diffuser insert for coal fired burners
US6588598B2 (en) * 1999-11-15 2003-07-08 Rickey E. Wark Multi-outlet diffuser system for classifier cones
US7506764B2 (en) 2003-02-12 2009-03-24 Michel Couture Apparatus and method for separating/mixing particles/fluids
CN1323805C (zh) * 2003-11-12 2007-07-04 高根树 针轮转子流体输送装置
US7118055B2 (en) * 2004-04-19 2006-10-10 Jin-Hong Chang Grinding mill
US7913851B2 (en) * 2004-04-19 2011-03-29 Jin-Hong Chang Separator for grinding mill
KR101223391B1 (ko) * 2006-02-24 2013-01-16 다이헤이요 세멘토 가부시키가이샤 원심식 공기분급기
DE102008038776B4 (de) 2008-08-12 2016-07-07 Loesche Gmbh Verfahren zur Sichtung eines Mahlgut-Fluid-Gemisches und Mühlensichter
JP4753387B2 (ja) * 2008-09-17 2011-08-24 日鉄鉱業株式会社 気流分級装置
US8231007B2 (en) * 2009-01-29 2012-07-31 Wark Rickey E Static classifier cage
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CA2830535C (en) 2011-03-24 2018-12-04 Babcock Power Services, Inc. Coal flow distribution controllers for coal pulverizers
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
CA2834032A1 (en) * 2012-12-05 2014-06-05 Coal Milling Projects (Pty) Limited A classifier and a method of modifying a classifier for use with a pulveriser
US9073087B2 (en) * 2013-09-03 2015-07-07 Kenneth Abbott Injector mechanism
CN104190621B (zh) * 2014-07-22 2017-05-10 中国中材国际工程股份有限公司 一种风扫式动静结合高效粉尘分离器
CN104353613A (zh) * 2014-11-04 2015-02-18 杭州能云科技有限公司 一种选粉机层流装置
CN109789425B (zh) 2016-08-09 2021-05-04 佐竹化学机械工业株式会社 分级装置
CN114054223B (zh) * 2021-11-15 2024-05-17 中国石油化工股份有限公司 一种排气管出口面积可调节的旋风分离器及其调节方法

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Also Published As

Publication number Publication date
US6273269B1 (en) 2001-08-14
FR2741286A1 (fr) 1997-05-23
US6318559B2 (en) 2001-11-20
CA2257674A1 (fr) 1998-10-22
US20010020597A1 (en) 2001-09-13
PL330322A1 (en) 1999-05-10
CZ292237B6 (cs) 2003-08-13
DE69729731D1 (de) 2004-08-05
UA63905C2 (en) 2004-02-16
JP2000512550A (ja) 2000-09-26
ES2224236T3 (es) 2005-03-01
CZ392498A3 (cs) 1999-04-14
JP3999278B2 (ja) 2007-10-31
WO1998046371A1 (fr) 1998-10-22
DK0918573T3 (da) 2004-10-18
AU2643597A (en) 1998-11-11
DE69729731T2 (de) 2005-08-04
EP0918573A1 (fr) 1999-06-02
FR2741286B1 (fr) 1998-01-23
PL186138B1 (pl) 2003-10-31
CA2257674C (fr) 2003-01-07
AU741249B2 (en) 2001-11-29
ATE270159T1 (de) 2004-07-15

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