EP3368222B1 - Séparateur à cascades raccordé pneumatiquement et système de broyage à circulation doté de séparateurs à cascades raccordés pneumatiquement - Google Patents

Séparateur à cascades raccordé pneumatiquement et système de broyage à circulation doté de séparateurs à cascades raccordés pneumatiquement Download PDF

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Publication number
EP3368222B1
EP3368222B1 EP16787859.4A EP16787859A EP3368222B1 EP 3368222 B1 EP3368222 B1 EP 3368222B1 EP 16787859 A EP16787859 A EP 16787859A EP 3368222 B1 EP3368222 B1 EP 3368222B1
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EP
European Patent Office
Prior art keywords
sifter
sifting
cascade
volume flow
fraction
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Not-in-force
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EP16787859.4A
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German (de)
English (en)
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EP3368222A1 (fr
Inventor
Siegfried Strasser
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KHD Humboldt Wedag AG
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KHD Humboldt Wedag AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
    • 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
    • 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
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • B07B9/02—Combinations of similar or different apparatus for separating solids from solids using gas currents

Definitions

  • the invention relates to a sifter for sifting granular reformgut, comprising a first V-shaped static cascade classifier, the first cascade classifier a first reformzone with first staircase-like baffles and first louver-like arranged preparefluten, at least one reformluft inlet for reformluft, at least one entry opening for the granular reformgut, at least one discharge opening for a Grobegutfr neglect as well as an outlet for a volume flow consisting of the classifying air and a first peeled mergegutfr quasi, and a second V-shaped static cascade classifier, the second cascade classifier second viewing zone with second staircase-like baffles and second louver-like arranged preparefluten, an inlet for a reformluftvolumenstrom, at least one discharge opening for a coarser bombardgutfr hope sized and an outlet for a Volumenstro m consisting of the classifying air and a second withdrawn, finer conveygutfr neglect.
  • the invention further relates to a Kreislaufmahlstrom for crushing granular material to be ground, having at least one grinding device for crushing the granular ground material to ground regrind and in the material flow direction behind the at least one grinding device connected sifter with at least one discharge opening for a coarse material fraction, said at least one discharge opening with a crop of the at least one grinding device is in communication.
  • classifiers typically used in cycle grinding plants include the static (ie, non-moving components) cascade classifiers, which most often have a V-shaped, bay-like viewing space and are therefore also referred to as V-classifiers.
  • V-shaped static cascade classifiers are known for example from the patent specification EP 0 650 763 B1 and the publication DE 196 48 841 A1 , where in the EP 0 650 763 B1
  • the use of cascade classifiers in circulating grinding plants is also taught.
  • Generic static cascade classifiers accordingly have a substantially V-shaped, shaft-shaped housing, in which two reformzonenbegrenzungs render between them form a viewing zone.
  • the grainy material to be seen falls gravity from above through an entry opening into the viewing zone of the V-classifier.
  • One of the crushernbegrenzungslander has cascade-like with each other arranged baffles in the manner of a stair grate on which the particles of the prepareguts fall staircase or cascade down.
  • a special advantage of Cascade classifier is that contained in the visual material particle agglomerates, for example. Slugs in cement production, are largely disagglomerated by the impact on the baffles. Transverse to the direction of fall, ie approximately horizontally, sighting air is passed through a visible air inlet into the viewing zone between the cascading baffles.
  • the finer, lighter togut ashameder not classified as coarse material are carried by the transversely flowing classifying air so that they are withdrawn in a flow through the reformluftkanäle from the viewing zone and discharged from an outlet behind the prepare for the production of the product.
  • This cascade classifier carries down as a product a Mittelgutfr neglect and together with the classifying air of this second cascade classifier a fine material fraction as another product.
  • it is disadvantageous in terms of the energy requirement as well as of the plant engineering effort that the entire proportion of the finer bringgutfr so subtracted from the first cascade classifier must first be supplied to a product separator before it can then be registered in the second cascade classifier.
  • the object of the invention is to provide a sifter for sifting granular reformgut available, which provides based on the cascade sender at least two different in terms of particle size products and thereby has a lower energy consumption.
  • the object of the invention is also to provide a Kreislaufmahlstrom for crushing granular material to be ground, which comprises such a classifying device.
  • the object of the invention is achieved by a sifter for sifting granular reformgut with the features of claim 1 and by a Kreislaufmahlstrom for crushing granular material to be ground with the features of claim 5. Further advantageous embodiments are specified in the subclaims to claim 1 and in the subclaims to claim 5.
  • the sifting device for sifting granular reformgut two V-shaped static cascade classifier includes, which are not only connected in series, but are also pneumatically connected to each other in a special way.
  • the second cascade classifier Due to the fact that the coarse material fraction has already been inspected in the first cascade classifier and taking into account any drop in pressure or velocity of the classifying air stream, the second cascade classifier can be dimensioned differently from the first one. Due to the finer withdrawguts or separating section and therefore required lower speeds, he will be larger in the normal case larger than the first cascade classifier.
  • a selected fraction is discharged, which represents a desired product, referred to here as product A, as the middle fraction.
  • product A a desired product
  • a separatgutfr noise is subtracted from the second cascade classifier together with the classifying air, which is finer than the selected Mittelgutfrtress and either already represents the desired fine-grained product or can be further divided into sub-fractions in subsequent screening steps.
  • the pneumatic connection between the two cascade classifiers is achieved in that, according to the invention, the outlet for the volume flow from the first cascade classifier is pneumatically connected pneumatically to the inlet of the classifying air volume flow of the second cascade classifier.
  • the visual zone boundary wall of the first cascade classifier which is arranged downstream of the visual floods (of the first cascade classifier), is permeable to the volume flow which consists of the classifying air and the first withdrawn bombardfr forcing the first cascade classifier.
  • the permeabilities can be distributed over the entire withdrawzonenbegrenzungswand or provided, for example, only in the upper region.
  • this process Due to the permeabilities of this sortzonenbegrenzungswand the outlet for the flow from the first cascade classifier is formed.
  • the digestzonenbegrenzungswand the second cascade classifier which is arranged in the flow direction in front of the baffles, permeable.
  • This processzonenbegrenzungswand forms with their permeabilities that can be distributed over the entire reformzonenbegrenzungswand or even in the upper area, the reformluftvolumenstromeinlass, this stream is inventively given by the volume flow consisting of the classifying air and the first withdrawn reformgutfr forcing from the first cascade classifier.
  • the reactor in a preferred embodiment of the invention, it is provided that the reformzonenbegrenzungswand of the first cascade classifier arranged in the flow direction behind the first viewing floods and the reformzonenbegrenzungswand arranged in the flow direction in front of the second baffle plates of the second cascade classifier to form a cavity located between them are spaced apart.
  • the cavity thus represents a transitional zone between the two cascade classifiers, through which the volume flow (consisting of the classifying air and the first withdrawn bombardfr against the first cascade classifier) flows to the second cascade classifier.
  • the cavity has an outlet opening in a wall, wherein a partial volume flow of the volume flow branches off from the first cascade classifier through the outlet opening, ie, out of the cavity and away from the two cascade classifiers. Since the visual efficiency and visual acuity in the second cascade classifier depends in particular on the visual air volume flow (quantity, speed) and the second cascade classifier, which can be dimensioned differently from the first, receives the volume flow exiting from the first cascade classifier as visual air, by means of the branching through the outlet opening an adjustment of the visual air conditions for the second cascade classifier can be achieved.
  • the size of the outlet opening is continuously adjustable.
  • an adjustment of the visual air conditions for the second cascade classifier can be carried out here by the person skilled in the art during operation.
  • a control can be made.
  • the outlet opening in the wall of the cavity communicates with a Gutabscheider.
  • the diverted partial flow is passed through suitable pipelines to the Gutabscheider, which is designed for example as a filter, preferably as a cyclone (cyclone separator, centrifugal).
  • the separator the proportion of the fraction of visible matter which has been withdrawn from the first cascade classifier is separated off in the branched partial volume flow.
  • the fraction of the first withdrawn fraction of the visual fraction deposited in the material separator is provided by at least one secondary goods entry opening is entered in the second cascade viewers. He is then subject in the second cascade viewers the further screening process.
  • the transport of the sifting material from the material separator to the secondary product insertion opening can be effected by gravity. Otherwise, mechanical means of transport, for example a bucket elevator, must be used.
  • the Sekundärguteintragsö réelle corresponds to the generic reformguteintragsö réelle in the upper part of a cascade classifier.
  • additional material can be entered for sifting into the viewing zone of the second cascade classifier. This may allow for enrichment or variation in the grain size distribution spectrum.
  • the finer reformgutfr noise (the numbering of the cascade classifier according to the second withdrawn admirgutfr expect) withdrawn from the second cascade classifier with the classifying air in a Gutabscheider (correspondingly referred to as second Gutabscheider) is separated from the classifying air, in she is suspended.
  • connection is made as a direct connection, or there is another (or in exceptional cases also several) classifier connected between the second cascade classifier and the second material separator for further product separations in the subtracted fine fraction.
  • the second Gutabscheider can, for example, as a filter, preferably as a cyclone, be executed.
  • a Kreislaufmahlstrom is also provided, in which the classifying device is designed as a classifying device according to the invention, including the illustrated embodiments.
  • the ground regrind is entered through the at least one entry opening for granular preparegut in the first cascade viewers.
  • the coarse material in the first cascade classifier is recirculated in the grinding circuit to the grinding device and through in the nip of a roller press, the material delivery device of this grinding device for a renewed stress, for example. It is therefore kept in circulation until it is removed during the viewing process in the first cascade classifier with the classifying air.
  • the proposed classifying device is suitable, in particular on account of the first cascade classifier, for carrying out the required pancake agglomeration.
  • the roller press By arranging the roller press with its nip above the entry opening of the first cascade classifier or by arranging the roller press with their crop below the discharge for the coarse material fraction of the first cascade classifier, the respective transport energy efficient low gravity can be performed.
  • the ever other transport is by mechanical means, eg. Conveyors and bucket elevators, to afford.
  • the second cascade classifier is followed by a classifier to the prospects of a bachelorgutfr forcing (product B) and for subtracting a fine material fraction in a classifying air-fine material stream.
  • the outlet for the volume flow consisting of the classifying air and the second withdrawn bombardgutfr against the second cascade classifier is to communicate pneumatically with the additional classifier.
  • the second Gutabscheider is given in a further embodiment as a filter, preferably as a cyclone, and corresponds to the second Gutabscheider, which has already been described above in an embodiment of the classifying device according to the invention.
  • the classifier is a dynamic rod basket sifter or a static Luftstromsichter that are equally suitable for a pneumatic material task, as for the conditions of use and separation requirements in cement production processes.
  • a sifter from the patent specification DE 42 23 762 B4 known as a compact combination of a static sifter and a downstream dynamic rod sifter (with horizontal shaft) (and sold under the name VSK® sifter), suitable for separating yet another fourth product.
  • FIG. 1 an embodiment of the sifter 1 according to the invention for sifting granular reformgut 2 is shown schematically.
  • the granular reformgut 2 is about within a Kreislaufmahlstrom for crushing granular material in the cement production as ground regrind, which may also contain agglomerated flakes given.
  • staircase-like baffles 6 and arranged like a shutter blinds 7 are present.
  • this volume flow 12 now passed into a second cascade classifier 14, which is pneumatically connected to the first cascade classifier 5.
  • the volume flow 12 enters the second cascade classifier 14 and its viewing zone 17 through the visual zone boundary wall 16 located upstream of the baffle plates 15 of the second cascade classifier 14.
  • a cavity 24 between the two mentioned detoxzonenbegrenzungsNasen 13, 16 is formed, through which the two cascade classifiers 5, 14 are pneumatically interconnected.
  • an outlet opening 25 is provided in the wall of the cavity 24, an outlet opening 25 is provided.
  • a partial volume flow 26 of the volume flow 12 can be diverted.
  • the strength of the given by the flow rate 12 classifying air flow in the second cascade classifier 14 can be adjusted for an effective and selective viewing process or even controlled.
  • FIG. 2 is the classifying device 1 according to the invention FIG. 1 shown, now extended by a cyclone 29 designed as (first) Gutabscheider 29. This separates the diverted preparegutanteil 30 from the classifying air 9 from.
  • the classifying air 9 is discharged in the illustrated example via a blower 31 and a filter in the environment or made available at other points of the entire system, for example, returned to the first V-classifier, the diverted prepareil 30 for further viewing process through the Sekundärguteintragsö réelle 27 registered in the second Kaskadensicht 14.
  • the depicted deposition and recycling of the branched portion is considerably cheaper in terms of energy requirements than a mere, separate series connection of two cascade classifiers without the pneumatic connection according to the invention.
  • the entire proportion of the finer bringgutfr deducted from the first cascade classifier would first have to be supplied to a product separator before it could then be registered in the second cascade classifier.
  • FIG. 3 is also schematically the inventive sifter 1 from FIG. 2 shown, now extended by a second cascade classifier 14 downstream fine viewing stage.
  • the volume flow 22 formed from the classifying air 9 and the second withdrawn meetgutfr neglect is passed here for further separation in an additional classifier 32.
  • the downstream classifier 32 is designed as a static air classifier 32.
  • a further Mittelgutfr forcing, product B is selected and deducted a fines fraction in the classifying air-fine flow 33.
  • the fine material fraction is provided as product C.
  • the classifying air 9 is, as shown, discharged by a blower 35 and a filter into the environment or made available at other points of the entire system.
  • this fresh air portion can be returned to the first cascade classifier 5 and introduced there together with fresh air or hot gas through the classifying air inlet 8 as total amount of air 9.
  • the shown downstream of a second Gutabscheiders 34, such as the cyclone 34, and the blower 35 and the possibility of returning the sortluftanteils 9 to the sighting air inlet 8 are also in the in FIG. 2 illustrated embodiment is possible and advantageous, in which case, however, between the second Kaskadensicht 14 and a second Gutabscheider 34 no further classifier 32 is interposed.
  • FIG. 3 illustrated embodiment of the separator device according to the invention can be achieved that three products (product A, product B, product C) are obtained with mutually different grain sizes (diameters).
  • grain sizes smaller than 4 mm are typical, for product B grain sizes smaller than 1 mm to less than 0.3 mm and for product C grain sizes smaller than zero , 15 mm to less than 0.02 mm.

Claims (9)

  1. Dispositif de tamisage (1) destiné à tamiser un produit en grains (2), le dispositif de tamisage comprenant
    - un premier tamiseur en cascade (5) statique en forme de V,
    le premier tamiseur en cascade (5) comportant une première zone de tamisage (4) pourvue de premières plaques déflectrices (6) disposées à la manière d'un escalier et des premiers projecteurs de tamisage (7) disposés à la manière d'un store, au moins une entrée d'air de tamisage (8) destinée à l'air de tamisage (9), au moins une ouverture d'entrée (3) destinée au produit en grains (2), au moins une ouverture de sortie (11) destinée à une fraction de produit grossier tamisée (10) et une sortie (18) destinée à un flux volumique (12) comprenant l'air de tamisage (9) et une première fraction de produit évacuée, et
    - un deuxième tamiseur en cascade (14) statique en forme de V,
    le deuxième tamiseur en cascade (14) comportant une deuxième zone de tamisage (17) pourvue de deuxièmes plaques déflectrices (15) disposées à la manière d'un escalier et des deuxièmes projecteurs de tamisage (21) disposés à la manière d'un store, une entrée (19) destinée à un flux de volume d'air de tamisage, au moins une ouverture de sortie (20) destinée à une fraction de produit grossier tamisée (produit A) et une sortie (23) destinée à un flux volumique (22) comprenant l'air de tamisage (9) et une deuxième fraction de produit fine évacuée,
    le flux volumique d'air de tamisage du deuxième tamiseur en cascade (14) étant défini par le flux volumique (12) comprenant l'air de tamisage (9) et la première fraction de produit provenant du premier tamiseur en cascade (5),
    le deuxième tamiseur en cascade (14) statique en forme de V étant relié pneumatiquement au premier tamiseur en cascade (5) statique en forme de V et étant monté en aval du premier tamiseur en cascade (5), caractérisé en ce que
    - la sortie (18) destinée au flux volumique (12) comprenant l'air de tamisage (9) et la première fraction de produit évacuée du premier tamiseur en cascade (5) est définie comme une paroi de délimitation de zone de tamisage (13) du premier tamiseur en cascade (5), laquelle laisse passer ce flux volumique (12) et est disposée en aval du premier projecteur de tamisage (7) par référence à la direction du flux,
    - l'entrée (19) destinée au flux volumique d'air de tamisage du deuxième tamiseur en cascade (14) est définie comme une paroi de délimitation de zone de tamisage (16) du deuxième tamiseur de cascade (14), laquelle laisse passer ce flux volumique d'air de tamisage et est disposée en amont des deuxièmes plaques déflectrices (15), et
    - la paroi de délimitation de zone de tamisage (13) du premier tamiseur en cascade (5), laquelle est disposée en aval du premier projecteur de tamisage (7) par référence à la direction du flux, et la paroi de délimitation de zone de tamisage (16) du deuxième tamiseur en cascade (14), laquelle est disposée en amont des deuxièmes plaques déflectrices (15) par référence à la direction du flux, étant espacées l'une de l'autre en ménageant une cavité (24) entre elles, et
    - une ouverture de sortie (25) étant ménagée dans une paroi de la cavité (24) pour dériver un flux volumique partiel (26) du flux volumique (12) provenant du premier tamiseur en cascade (5).
  2. Dispositif de tamisage (1) selon la revendication 1,
    caractérisé en ce que
    la dimension de l'ouverture de sortie (25) est réglable en continu.
  3. Dispositif de tamisage (1) selon l'une des revendications 1 ou 2,
    caractérisé en ce que
    l'ouverture de sortie (25) ménagée dans la paroi de la cavité (24) communique avec un premier séparateur de produit (29) destiné à séparer une partie (30), en suspension dans le flux volumique partiel dérivé (26), de la première fraction de produit évacuée,
    la partie (30), dérivée dans le séparateur de produit (29), de la première fraction de produit évacuée étant introduite dans le deuxième tamiseur en cascade (14) par au moins une ouverture d'entrée de produit secondaire (27).
  4. Dispositif de tamisage (1) selon l'une des revendications 1 à 3,
    caractérisé en ce que
    la sortie (23) destinée au flux volumique (22) comprenant l'air de tamisage (9) et la deuxième fraction de produit évacuée du deuxième tamiseur en cascade (14) communique avec un deuxième séparateur de produit (34).
  5. Installation de broyage à mouvement circulaire destinée à désintégrer un produit en grains, ladite installation comprenant
    - au moins un dispositif de broyage destiné à désintégrer le produit en grains pour donner un produit broyé, et
    - un dispositif de tamisage (1) monté en aval de l'au moins un dispositif de broyage par référence à la direction du flux de matière et comportant au moins une ouverture de sortie (11) destinée à une fraction de produit grossière tamisée (10), l'au moins une ouverture de sortie (11) communiquant avec une alimentation en produit de l'au moins un dispositif de broyage,
    caractérisée en ce que
    le dispositif de tamisage (1) est défini comme un dispositif de tamisage (1) présentant les caractéristiques selon l'une des revendications 1 à 4, le produit broyé (2) étant introduit dans le premier tamiseur en cascade (5) par l'au moins une ouverture d'entrée (3) destinée au produit en grains (2).
  6. Installation de broyage à mouvement circulaire selon la revendication 5,
    caractérisée en ce que
    l'au moins un dispositif de broyage est une presse à rouleaux.
  7. Installation de broyage à mouvement circulaire selon l'une des revendications 5 ou 6,
    caractérisée en ce que
    - un tamiseur (32) destiné à tamiser une fraction de produit moyen (produit B) et à évacuer une fraction de produit fin dans un flux d'air de tamisage et de produit fin (33) est monté en amont du deuxième tamiseur en cascade (14), la sortie (23) destinée au flux volumique (22) comprenant l'air de tamisage (9) et la deuxième fraction évacuée du deuxième tamiseur en cascade (14) communiquant avec le tamiseur (32) de manière pneumatique, et en ce que
    - un deuxième séparateur de produit (34) est en aval du tamiseur (32) par référence à la direction du flux d'air de tamisage, le deuxième séparateur de produit (34) séparant la fraction de produit fin (produit C) du flux (33) d'air de tamisage et de produit fin.
  8. Installation de broyage à mouvement circulaire selon la revendication 7,
    caractérisée en ce que
    le tamis (32) est un tamis à panier à barres dynamique ou un tamis à flux d'air statique (32).
  9. Installation de broyage à mouvement circulaire selon l'une des revendications 7 ou 8,
    caractérisée en ce que
    le deuxième séparateur de produit (34) est un filtre ou de préférence un cyclone (34).
EP16787859.4A 2015-10-28 2016-10-27 Séparateur à cascades raccordé pneumatiquement et système de broyage à circulation doté de séparateurs à cascades raccordés pneumatiquement Not-in-force EP3368222B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015013892.8A DE102015013892B3 (de) 2015-10-28 2015-10-28 Pneumatisch verbundene Kaskadensichter und Kreislaufmahlanlage mit pneumatisch verbundenen Kaskadensichtern
PCT/EP2016/075894 WO2017072214A1 (fr) 2015-10-28 2016-10-27 Séparateur à cascades raccordé pneumatiquement et système de broyage à circulation doté de séparateurs à cascades raccordés pneumatiquement

Publications (2)

Publication Number Publication Date
EP3368222A1 EP3368222A1 (fr) 2018-09-05
EP3368222B1 true EP3368222B1 (fr) 2019-10-02

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EP (1) EP3368222B1 (fr)
CN (1) CN108348923B (fr)
DE (1) DE102015013892B3 (fr)
WO (1) WO2017072214A1 (fr)

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DE102018129538B4 (de) * 2018-11-23 2020-10-01 Khd Humboldt Wedag Gmbh Pneumatisch miteinander verbundener Mehrfachsichter

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CN108348923A (zh) 2018-07-31
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EP3368222A1 (fr) 2018-09-05
WO2017072214A1 (fr) 2017-05-04

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