EP0250747A2 - Procédé et dispositif de séparation pneumatique - Google Patents

Procédé et dispositif de séparation pneumatique Download PDF

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Publication number
EP0250747A2
EP0250747A2 EP87105736A EP87105736A EP0250747A2 EP 0250747 A2 EP0250747 A2 EP 0250747A2 EP 87105736 A EP87105736 A EP 87105736A EP 87105736 A EP87105736 A EP 87105736A EP 0250747 A2 EP0250747 A2 EP 0250747A2
Authority
EP
European Patent Office
Prior art keywords
air
air classifier
centrifugal basket
stage
centrifugal
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
EP87105736A
Other languages
German (de)
English (en)
Other versions
EP0250747B1 (fr
EP0250747A3 (en
Inventor
Ernst W. Dr.-Ing. Hanke
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.)
CHRISTIAN PFEIFFER MASCHINENFABRIK GMBH & CO. KOMM
Original Assignee
Christian Pfeiffer Maschinenfabrik GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
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Application filed by Christian Pfeiffer Maschinenfabrik GmbH and Co KG filed Critical Christian Pfeiffer Maschinenfabrik GmbH and Co KG
Priority to AT87105736T priority Critical patent/ATE82876T1/de
Publication of EP0250747A2 publication Critical patent/EP0250747A2/fr
Publication of EP0250747A3 publication Critical patent/EP0250747A3/de
Application granted granted Critical
Publication of EP0250747B1 publication Critical patent/EP0250747B1/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

Definitions

  • the invention relates to a method for air separation of a grain mixture with indulgence according to the preamble of claim 1 and an air classifier according to the preamble of claim 2.
  • Such a method and a corresponding air classifier are known from the document EP 23 320 B1.
  • This known air classifier generally requires dust separators, e.g. in the form of cyclones and filters.
  • the fine material throughput of such a known air classifier depends in particular on the vertical height and the diameter of its centrifugal basket, that is to say on its circumferential surface or the cylindrical annular space in which the screening is carried out.
  • the other essential parameter of a sifting namely the grain size limit, which distinguishes the fine material from the coarse material, is determined on the one hand by the diameter and the speed of the centrifugal basket and on the other hand depends on the outer diameter of the visible space and the inflow speed of the visible air into the visible space.
  • the grain size limit depends on the acceleration forces acting on the material to be viewed.
  • the vertical dimensioning of the centrifuge basket is also limited due to the mechanical load on its peripheral strips. Above all, however, the enlargement of the centrifugal basket in the vertical direction is restricted by the occurrence of different flow velocities along the strips of the centrifugal basket when visible air and fine material pass between these strips.
  • the flow velocities along the jacket-like peripheral surface of the centrifugal basket are essentially directly dependent on the suction within the centrifugal basket. This suction is greatest at the visible material outlet of the centrifuge basket for the fine material and decreases in the direction of the opposite, closed end face of the centrifugal basket.
  • the rotary drive takes place via this closed or at least largely closed end face by means of the vertical drive axis.
  • the invention has for its object to design a method and an air classifier for performing the method so that the aforementioned disadvantages are avoided and a long operating time is achieved even with relatively abrasive visible material, with high throughput and improved selectivity, this possibly being able to be achieved with a relatively small footprint for the air classifier.
  • This object is achieved in a method according to the preamble of claim 1 by the features of the characterizing part of claim 1 and in an air classifier according to the preamble of claim 2 by the features of the characterizing part of claim 2.
  • a corresponding air classifier according to the invention is designed with at least two air classifier stages, wherein the air classifier used for indulgence is equipped with a centrifugal basket, corresponding centrifugal baskets and one or more coaxial rims of guide vanes, but for optimal indulgence, the dimensions of the second air classifier stage are usually different from those of the first wind classifier stage.
  • the sifting parameters of the second air classifier stage can be adjusted even more suitably to the desired grain sizes and limiting grain sizes.
  • the method according to the invention and the corresponding device are therefore particularly suitable for upper grain sizes below 10 ⁇ m. Since appropriate dust separators, such as cyclones or filters, are required for the separation of the fine material from the classifying air, the small installation area achieved by the vertical multi-stage in the air classifier according to the invention suits use with cyclones accordingly.
  • the multi-stage of the air classifier makes it possible to keep the classifier diameter relatively small, so that the wind classifier according to the invention is very well adapted to the cyclone use due to the small space requirement and, moreover, the relatively large overall height of the cyclones can be fully utilized.
  • the wind sifter according to the invention is also suitable due to its multi-stage nature that different sifting air quantities of different fluidic properties can be used, the controlled introduction into the sifting space through the adjustable guide vane rings and the optimization of the sighting in With regard to improved selectivity by means of different dimensions of the downstream air classifier stage is guaranteed.
  • the air classifier advantageously has at least two centrifugal baskets of different axial heights and with different diameters. Different strips can be provided with different angles of inclination.
  • the individual centrifugal baskets of the various air classifier stages are advantageously driven separately, e.g. via corresponding hollow shafts that run into each other This possibility opens up the fine tuning of the mechanical centrifugal rejection of the coarse grain to be sifted.
  • a further advantage for indulgence is achieved with the formation of the end face of the downstream centrifugal basket facing the upstream air classifier stage as a closed surface, which takes over the function of a spreading disc.
  • the spreading disc for the coarse material coming from the upstream air classifier stage can also be provided separately from the centrifugal basket.
  • the spreading plate function is essential, which enables further dispersion of the coarse material that has already been viewed at least once, so that it can be introduced into the subsequent viewing area in a well-distributed manner.
  • the centrifugal basket of the second air classifier stage expediently has a somewhat larger diameter with reduced axial extension than the centrifugal basket of the first wind classifier stage.
  • both end faces of the centrifugal basket of the first air classifier stage are largely designed as through-openings, the centrifugal basket itself being in drive connection with the axle via a few radial stiffening webs.
  • the air classifier is designed with a closed lower end face of the first centrifugal basket and an open end surface for the second centrifugal basket, which is connected to a corresponding suction line, the advantage of better classification is achieved, since in this case three areas of different grain sizes can be viewed and separated .
  • the air channels are expediently designed as two- or multi-flight spiral housings, which allow largely tangential air entry to the guide vane rings.
  • the individual inlets are arranged equidistantly around the circumference in order to achieve flow conditions that are as uniform as possible over the entire circumference of the viewing space.
  • the vertical separation of the different air channels for a centrifugal basket can, for example, in one Air duct on one horizontal level is used to inject hot mill exhaust air and on another, for example a horizontal level below it, cooler, possibly dust-free, atmospheric visual air is blown in.
  • the colder visual air is preferably supplied in a lower air duct in order to thereby cool the material being viewed. There is therefore the possibility of allowing visible air with process-related different flow velocities to flow in only in a certain plane of the centrifugal basket, so that, viewed over the entire circumference of the centrifugal basket, there are uniform operating conditions.
  • the wind classifier according to the invention is not limited to the version with two wind classifier stages.
  • the use of a further, downstream third air classifier stage may be necessary and expedient.
  • the removal of the sifting air loaded with fine material from the third air classifier stage is expediently carried out independently of the discharge of the sifting air of the upstream stages and downwards.
  • the only drawing shows a vertical section through an air classifier 3 with two air classifier stages 1, 2.
  • the material to be placed in the air classifier 3 is fed via a largely centrally arranged upper material inlet 25.
  • the visible material predispersed by this spreading plate 26 reaches a further, second spreading plate 27 via two tapering steps of the housing of the air classifier 3.
  • the material to be sighted reaches the first sighting chamber 4 of the first wind sifter stage 1 in a well-dispersed manner.
  • the sighting chamber 4 is circular, cylindrical, being delimited radially outwards by separately adjustable guide vane rings 6 and 7 which are arranged vertically one above the other. Radially inward, the boundary of the visible space 4 is formed by the outer edges of the blow bars 10 of the centrifugal basket 9.
  • the classifying air for the first air classifier stage 1 enters the classifying room 4 via the air channels 5, which are designed, for example, in a horizontal section as a two-flight spiral housing.
  • the classifying air flows into the classifying room 4 with a swirl, and the classifying material is pre-separated from the outside inside the viewing space 4 flowing Air flow accelerate the particles falling into the visual space on a spiral path.
  • coarse material particles are carried out of the spiral track as a result of the higher centrifugal forces acting on them and fall due to gravity onto the first coarse material funnel 8 arranged at the lower region of the first air classifier stage 1.
  • the fine material particles remaining in the spiral air flow on the first air classifier stage 1 are taken to the outer circumference of the rotating centrifugal basket 9.
  • the rotation of the centrifugal basket 9 with its blow bars 10 arranged radially on the outside in the vertical direction accelerates the particles reaching between the blow bars again, entrained particles of the coarse material being thrown back into the viewing space 4.
  • the fine material guided into the interior of the centrifugal basket 9 through the classifying air is suctioned off to the subsequent dust separators via the front opening 11 provided in the upper region of the centrifugal basket 9 and via a two-course discharge spiral 12 connected therewith.
  • the centrifugal basket 9 is driven via a drive shaft 28 designed as a hollow tube, in which a further drive shaft 29 for the centrifugal basket 14 of the second air classifier stage 2 is guided.
  • the centrifugal basket 9 has a closed end wall 31 in the lower region which, for better stabilization, is guided and stiffened approximately in the middle with struts 30 running obliquely to the drive shaft 28 or a wear-protected cone jacket.
  • the coarse material leaving the first coarse material hopper 8 reaches the upper, closed end wall 13 of the second centrifugal basket 14 intended for indulgence.
  • the centrifugal basket 14 of the second air classifier stage 2 is provided with a smaller vertical extension than the first centrifugal basket 9. However, it has a larger diameter than the first centrifugal basket 9.
  • the second centrifugal basket 14 is driven via a second drive shaft 29, which is guided coaxially in the first drive shaft 28, intermediate bearings and struts with the housing of the air classifier 3 being provided via the vertical extension.
  • the separate drive shaft 29 also allows the lower air classifier stage 2 to be operated at a different number of revolutions.
  • the centrifugal basket 14 has blow bars 21 arranged radially on the outside, which are distributed equidistantly over its circumference.
  • the annular visual space 15 of the second air classifier stage 2 is delimited radially outwards by guide vane rings 16 and 17 which can be adjusted independently of one another about their vertical axis.
  • the guide vane ring 16 is assigned to a separate air duct 18, 18 ⁇ , which in horizontal section e.g. is designed multi-course.
  • the lower guide vane ring 17, guides the visible air flowing in via the air duct 19 and 19 ⁇ into the visible space 15 with swirl.
  • the air ducts are approximately rectangular in vertical section.
  • the air channels 18 and 18 ⁇ are vertically separated from each other with respect to the air channels 19 and 19 ⁇ . This makes it possible Lich to feed these air ducts with different sifting air.
  • the air channel 18, 18 ⁇ which is designed to be more wear-resistant, can be used for the supply of hot, particle-laden mill exhaust air, while the air channels 19 and 19 ein introduce cool, fresh atmospheric air into the viewing area in order to cool the visible material again at this level.
  • An inspection of the coarse material takes place in the viewing area 15 in the manner already explained for the air classifier stage 1.
  • the coarse material cleaned from undesired fine material falls out of the viewing space 15 into the coarse material funnel 20 and is discharged downward.
  • the mixed air from the air channels 18, 18 ⁇ , 19 and 19 ⁇ flows with the desired, remaining fine particles through the blow bars 21 of the second centrifugal basket 14. These remaining fine particles are together with the mixed air via a collecting container connected to the lower open end face 32 of the centrifugal basket 14 22 aspirated.
  • the extraction takes place via two air outlets 23 which are connected laterally to the collecting container 22 and which feed the visual air laden with fine material to further dust separators.
  • a fine material with a completely different grain structure can be achieved via the air outlets 12 compared to the fine material which is obtained via the air outlets 23.
  • This process-based production of different grain distributions for the fine material is particularly advantageous for the production of cement flour, in order in this way to improve the concrete's technical properties, such as the temporal strength increase in hardening.
  • Improved screening and better selectivity for fines as well as for coarse goods can also be achieved with the air classifier according to the invention by intentionally varying the air quantities supplied to the two classifying rooms 4 and 15 and by applying different flow velocities.
  • the invention therefore has the advantage that the optionally multi-stage indulgence achieves a higher setting accuracy for desired limit grain sizes, the mechanical cleaning by means of the function of the centrifugal baskets in particular improving this.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Separation By Low-Temperature Treatments (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Centrifugal Separators (AREA)
EP87105736A 1986-06-25 1987-04-16 Procédé et dispositif de séparation pneumatique Expired - Lifetime EP0250747B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87105736T ATE82876T1 (de) 1986-06-25 1987-04-16 Verfahren zur windsichtung und windsichter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863621221 DE3621221A1 (de) 1986-06-25 1986-06-25 Verfahren zur windsichtung und windsichter
DE3621221 1986-06-25

Publications (3)

Publication Number Publication Date
EP0250747A2 true EP0250747A2 (fr) 1988-01-07
EP0250747A3 EP0250747A3 (en) 1989-05-24
EP0250747B1 EP0250747B1 (fr) 1992-12-02

Family

ID=6303632

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87105736A Expired - Lifetime EP0250747B1 (fr) 1986-06-25 1987-04-16 Procédé et dispositif de séparation pneumatique

Country Status (5)

Country Link
US (1) US4869786A (fr)
EP (1) EP0250747B1 (fr)
AT (1) ATE82876T1 (fr)
DE (2) DE3621221A1 (fr)
ES (1) ES2036541T3 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0460490A2 (fr) * 1990-06-08 1991-12-11 Klöckner-Humboldt-Deutz Aktiengesellschaft Séparateur pneumatique
EP0484758A2 (fr) * 1990-11-08 1992-05-13 Christian Pfeiffer Maschinenfabrik GmbH & Co. Kommanditgesellschaft Dispositif pour la dispersion de matières
WO1992009376A1 (fr) * 1990-11-26 1992-06-11 F.L. Smidth & Co. A/S Separateur double servant a trier des matieres particulaires
EP0519535A1 (fr) * 1991-06-17 1992-12-23 ITALCEMENTI S.p.A. Séparateur dynamique pour matières pulvérulentes, en particulier du ciment, et installation comportant ledit séparateur
EP1004366A2 (fr) * 1998-11-27 2000-05-31 HOSOKAWA ALPINE Aktiengesellschaft & Co. OHG Séparateur pneumatique
WO2012168625A2 (fr) 2011-06-08 2012-12-13 Pa Technologies Séparateur dynamique pour matériaux pulvérulents

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KR930004539B1 (ko) * 1988-02-09 1993-06-01 캐논 가부시끼가이샤 기류 분급기
DE3843338A1 (de) * 1988-12-22 1990-06-28 Krupp Polysius Ag Sichter
DE4002867C1 (fr) * 1990-02-01 1991-08-29 Evt Energie- Und Verfahrenstechnik Gmbh, 7000 Stuttgart, De
FR2658096B1 (fr) * 1990-02-13 1992-06-05 Fives Cail Babcock Selecteur a air a action centrifuge.
DE4116683A1 (de) * 1991-05-22 1992-11-26 Nied Roland Verfahren und vorrichtung fuer die windsichtung
US5273163A (en) * 1992-01-23 1993-12-28 Luzenac America, Inc. Centrifugal particle classifier having uniform influx distributor
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US6276534B1 (en) 1998-04-03 2001-08-21 Hosokawa Micron Powder Systems Classifier apparatus for particulate matter/powder classifier
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US7028847B2 (en) * 2003-05-29 2006-04-18 Alstom Technology Ltd High efficiency two-stage dynamic classifier
EP1561519A1 (fr) * 2004-02-04 2005-08-10 Magotteaux International S.A. Séparateur de matière granuleuse
DE102004027128A1 (de) * 2004-06-03 2005-12-22 Polysius Ag Vorrichtung zum Sichten von körnigem Gut in wenigstens drei Kornfraktionen
US20080040980A1 (en) * 2006-07-13 2008-02-21 Unimin Corporation Method of processing nepheline syenite
US20080015104A1 (en) * 2006-07-13 2008-01-17 Unimin Corporation Ultrafine nepheline syenite
US8858699B2 (en) 2006-07-13 2014-10-14 Unimin Corporation Ultra fine nepheline syenite powder and products for using same
DE102006044833B4 (de) * 2006-09-20 2010-01-21 Babcock Borsig Service Gmbh Zentrifugalsichter und Verfahren zum Sichten
US7757976B2 (en) * 2007-02-07 2010-07-20 Unimin Corporation Method of processing nepheline syenite powder to produce an ultra-fine grain size product
WO2009008965A1 (fr) * 2007-07-09 2009-01-15 Unimin Corporation Poudre de syénite néphélinique ayant une taille de particules régulée et son nouveau procédé de fabrication
JP4785802B2 (ja) * 2007-07-31 2011-10-05 株式会社日清製粉グループ本社 粉体分級装置
BRPI0822390B1 (pt) 2008-04-17 2018-06-26 Unimin Corporation Pó ultrafino formado a partir de mineral ou material de rocha com distribuição de tamanho de partícula controlada para filmes térmicos ou revestimentos, e seu método de produção
CA2638150C (fr) * 2008-07-24 2012-03-27 Sunopta Bioprocess Inc. Methode et appareil permettant le transport d'une charge d'alimentation cellulosique
US9127325B2 (en) 2008-07-24 2015-09-08 Abengoa Bioenergy New Technologies, Llc. Method and apparatus for treating a cellulosic feedstock
CA2638157C (fr) * 2008-07-24 2013-05-28 Sunopta Bioprocess Inc. Methode et appareil permettant le transport d'une charge d'alimentation cellulosique
CA2638159C (fr) * 2008-07-24 2012-09-11 Sunopta Bioprocess Inc. Methode et appareil permettant le traitement d'une charge d'alimentation cellulosique
CA2638160C (fr) * 2008-07-24 2015-02-17 Sunopta Bioprocess Inc. Methode et appareil permettant le transport d'une charge d'alimentation cellulosique
CA2650913C (fr) * 2009-01-23 2013-10-15 Sunopta Bioprocess Inc. Methode et appareillage de transport de produits de depart cellulosiques
CA2650919C (fr) * 2009-01-23 2014-04-22 Sunopta Bioprocess Inc. Methode et installation de transport de produit de depart cellulosique
US8915644B2 (en) 2008-07-24 2014-12-23 Abengoa Bioenergy New Technologies, Llc. Method and apparatus for conveying a cellulosic feedstock
PL2467532T3 (pl) 2009-08-24 2014-11-28 Abengoa Bioenergy New Tech Llc Sposób wytwarzania etanolu i współproduktów z biomasy celulozowej
US9211547B2 (en) 2013-01-24 2015-12-15 Lp Amina Llc Classifier
JP6328229B2 (ja) * 2014-03-31 2018-05-23 ホソカワミクロン株式会社 分級機
DE102016106588B4 (de) * 2016-04-11 2023-12-14 Neuman & Esser Process Technology Gmbh Sichter
CN110961351A (zh) * 2019-12-20 2020-04-07 浙江清湖建材股份有限公司 一种新型重质碳酸钙粉生产用筛分装置

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EP0023320B1 (fr) * 1979-07-17 1984-03-07 Onoda Cement Company, Ltd. Séparateur sélectif d'air
DE2951819C2 (de) * 1979-12-21 1982-09-16 Omya GmbH, 5000 Köln Zentrifugalkraftsichter
DE3038625A1 (de) * 1980-10-13 1982-05-19 Fa. Christian Pfeiffer, 4720 Beckum Drehluft-fliehkraft-streusichter
DE3231526A1 (de) * 1982-08-25 1984-03-01 PKS-Engineering GmbH & Co KG, 4720 Beckum Verbesserter windsichter
US4528091A (en) * 1983-01-29 1985-07-09 Alpine Aktiengesellschaft Augsburg Particle classifier

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0460490A2 (fr) * 1990-06-08 1991-12-11 Klöckner-Humboldt-Deutz Aktiengesellschaft Séparateur pneumatique
EP0460490A3 (en) * 1990-06-08 1992-01-15 Kloeckner-Humboldt-Deutz Aktiengesellschaft Air classifier
EP0484758A2 (fr) * 1990-11-08 1992-05-13 Christian Pfeiffer Maschinenfabrik GmbH & Co. Kommanditgesellschaft Dispositif pour la dispersion de matières
EP0484758A3 (en) * 1990-11-08 1992-09-23 Christian Pfeiffer Maschinenfabrik Gmbh & Co. Kommanditgesellschaft Apparatus for dispersing materials
WO1992009376A1 (fr) * 1990-11-26 1992-06-11 F.L. Smidth & Co. A/S Separateur double servant a trier des matieres particulaires
EP0519535A1 (fr) * 1991-06-17 1992-12-23 ITALCEMENTI S.p.A. Séparateur dynamique pour matières pulvérulentes, en particulier du ciment, et installation comportant ledit séparateur
EP1004366A2 (fr) * 1998-11-27 2000-05-31 HOSOKAWA ALPINE Aktiengesellschaft & Co. OHG Séparateur pneumatique
EP1004366A3 (fr) * 1998-11-27 2000-07-19 HOSOKAWA ALPINE Aktiengesellschaft & Co. OHG Séparateur pneumatique
WO2012168625A2 (fr) 2011-06-08 2012-12-13 Pa Technologies Séparateur dynamique pour matériaux pulvérulents

Also Published As

Publication number Publication date
EP0250747B1 (fr) 1992-12-02
ES2036541T3 (es) 1993-06-01
DE3621221C2 (fr) 1988-09-22
EP0250747A3 (en) 1989-05-24
DE3782859D1 (de) 1993-01-14
US4869786A (en) 1989-09-26
ATE82876T1 (de) 1992-12-15
DE3621221A1 (de) 1988-01-14

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