EP2081699A2 - Method for manufacturing fine mineral powder products - Google Patents

Method for manufacturing fine mineral powder products

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Publication number
EP2081699A2
EP2081699A2 EP07846319A EP07846319A EP2081699A2 EP 2081699 A2 EP2081699 A2 EP 2081699A2 EP 07846319 A EP07846319 A EP 07846319A EP 07846319 A EP07846319 A EP 07846319A EP 2081699 A2 EP2081699 A2 EP 2081699A2
Authority
EP
European Patent Office
Prior art keywords
air
water
classifier
temperature
relative humidity
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
EP07846319A
Other languages
German (de)
French (fr)
Other versions
EP2081699B1 (en
Inventor
Ulrich Schindler
Christoph Bauer
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.)
Omya International AG
Original Assignee
Calcarb AG
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 Calcarb AG filed Critical Calcarb AG
Priority to SI200731689T priority Critical patent/SI2081699T1/en
Priority to PL07846319T priority patent/PL2081699T3/en
Publication of EP2081699A2 publication Critical patent/EP2081699A2/en
Application granted granted Critical
Publication of EP2081699B1 publication Critical patent/EP2081699B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/02—Arrangement of air or material conditioning accessories
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B17/00—Methods preventing fouling
    • B08B17/02—Preventing deposition of fouling or of dust

Definitions

  • the invention relates to a process for the production of fine mineral powder products by means of plants consisting of one or more air classifiers, dust collectors such as cyclones and / or filters, at least one fan and connecting these apparatus pipes or channels for air and solids transport.
  • air classifiers such as zig-zag classifiers, air recirculation classifiers, spiral or deflector classifiers can be used.
  • the screening of CaCO 3 with average particle sizes below about 5 ⁇ m occurs frequently . to the .
  • Irradiation of the system parts through which the air / powder mixture flows such as the sifter itself, the air fines or channels and other apparatuses belonging to an air separation unit, such as cyclones, filters and ventilators, have hard, scaly deposits. These deposits usually grow into shell-like deposits (so-called "eggshells"), but also to tooth-like structures, until they peel off from the walls from time to time and contaminate the fine product which is usually specified with regard to coarse residues with platelets of up to a few mm in size. This can lead to complaints with high economic damages.
  • eggshells also lead to imbalances on rotating parts in air classifiers such as the classifying rotors and the fan rotors, which severely limits the operation or leads to high costs for cleaning and / or balancing.
  • the object of the invention is therefore to avoid the deposits mentioned above and thus the disadvantages associated with them.
  • the - surprising - solution of this task according to the invention is that the relative humidity (RH) of the classifying air in the range of about 15% to about 50%, preferably 15% to about 35%, is maintained.
  • the RH is measured in the classifier - and / or at other points in the system - and water is introduced into the classifying air as a function of the respective measured value.
  • the notifying party has found that eggshells are more pronounced than about 15% at a lower RH of the classifying air. Therefore, according to the invention, the rF of the classifying air is set to a value above approximately 15%.
  • the fresh air drawn in from the surroundings is heated in the classifier. This is especially true if part of the (warmer) sighting air is returned from behind the filter to the visible air inlet.
  • the relative humidity of the classifying air in the classifier drops to values often below 10% RH. This is especially true for arid areas where the ambient air is naturally very dry, such as in Arizona / USA with a mean annual humidity of 14% RH.
  • the drier the classifying air is, the drier the particles in it naturally are. One should think that the less dry the particles and the walls, the less particles are deposited on the walls.
  • the RH should not be increased above about 35%, otherwise the costs would be too high and the benefits would be too low.
  • the adjustment of the relative humidity preferably takes place before it enters the detector.
  • a very simple embodiment of the invention is that in the intake duct for the fresh air steam is injected. (Claim 2, Fig.l)
  • the water can be sprayed under high pressure of 60 to 115 bar and droplet sizes below 30 ⁇ m in the intake. (Claim 3)
  • the water can be preheated to a temperature between 50 C 0 and 90 C °. (Claim 4)
  • the intake duct is dimensioned such that air speeds of between 1 m / s and 3 m / s are established. (Claim 5)
  • the classifying air is passed through a Luftbefeuchtungsemcardi and thus entered the amount of water required in each case (claim 6).
  • the air humidifying device preferably has at least one hose or a tube made of material permeable to water, through which water is passed and over whose outer surface the viewing air is passed (claim 7).
  • water from where • it is taken up by the passing classifying air passes from the inside to the outside of the tube or pipe.
  • Such a device is e.g. available from AWS Air Water Systems AG in Villach, Austria.
  • Another embodiment of the invention is characterized in that the majority of the exhaust air of the filter is returned to the intake manifold of the air classifier and the humidification takes place in the return duct. (Claim 8, Fig. 4) This can be done in a simple manner so that the addition of water on the relative humidity of the exhaust air, its temperature and the temperature of the air is controlled in the air classifier. (Claim 9)
  • the temperature of the classifying air is in practice in the range below 100 0 C.
  • a further improvement achieved in that the temperature of the air in the region of the separator between 30 C ° and 80 C ° is maintained.
  • the effort for the humidification of the air ie the required amount of water and the energy required for the task of water, is relatively low.
  • the feed can be fed from a pre-product silo or directly from an upstream dry mill with or without conveying air.
  • the mill exhaust air can advantageously be supplied to the air sifter and the air in front of the mill can be humidified (using the methods specified in claims 2 to 4) (claim 11).
  • Fig. 1 shows an embodiment with reference to a simple circuit of a
  • FIG. 2 shows an embodiment in which a partial flow of the air / powder mixture leaving the cyclone is returned to the inlet of the air classifier
  • 3 shows an exemplary embodiment in which both a partial flow of the air / powder mixture leaving the cyclone and also a partial flow of the filter exhaust air are returned to the inlet of the air classifier
  • Fig. 5 shows an exemplary embodiment, in which a dry mill with ventilation is connected upstream of the air classifier
  • FIG. 6 shows an exemplary embodiment with regulation of the humidity of the air in the windscreen.
  • an air separation plant (FIG. 1) consists of an air classifier I 5, a cyclone 2, a filter 3, a fan 4, the pipelines or channels 5 connecting these aggregates, and supply and discharge facilities for feed 6a, fine 6b and coarse material 6c ,
  • the feed material is separated into coarse material and fine material.
  • the coarse material is discharged through the coarse material outlet 6c.
  • the fine material which usually represents the desired powder product, separated from the classifying air and further promoted by means of a screw conveyor 5 c.
  • the visible or cyclone exhaust air is dedusted in the filter 3 and sucked by the fan 4 to the outside, the fines dust is fed into the screw conveyor.
  • the fresh air inlet opening 6d can be located directly on the classifier housing or on an upstream fresh air inlet channel. Depending on the type of wind sifter, so-called false air may also enter the air classifier, for example for the purpose of sealing.
  • the relative humidity of the classifying air is maintained in the range of 15% to 35%.
  • Fig.l water is injected for this purpose in the form of vapor or in the form of drops in the intake fresh air at the point A, namely in the fresh air supply 6d.
  • 2 shows an exemplary embodiment in which, in a manner known per se, a partial flow of the air / powder mixture leaving the cyclone 2 is returned behind a cyclone fan 4a through pipes or channels 5a to the fresh air inlet 6d of the air classifier.
  • the air classifier 1 is coupled directly to a ventilated mill 7 and the exhaust air of the mill is guided through pipes 8 to the fresh air inlet of the classifier. It is advantageous to make the humidification of the air already at the entrance of the mill.
  • This measure can also be coupled with the aforementioned exemplary embodiments.
  • FIG. 6 explains in principle how the control according to the invention can be carried out in the exemplary embodiment according to FIG. 4.
  • the relative humidity and the temperature of the classifier exhaust air are measured behind the filter fan 4 by means of sensors 10, and the temperature of the air at the outlet of the classifier is measured by means of a sensor 9.
  • the relative humidity can be better measured in dust-free air. Based on the known relationships between temperature and water loading, the relative humidity in the classifier itself is calculated from these measured values, and accordingly the supply of water into the return air line 5b is readjusted such that the desired relative humidity in the classifier 1 is established.
  • Fineness of the product at 2 ⁇ m 61,30%
  • Classifier speed 3000 rpm 3000 rpm
  • Fineness of the product at 2 ⁇ m 61.90% 54.90%
  • Classifier speed 3000 rev / min flow of air: 9000 m 3 / h
  • Classifier speed 3000 rpm 3000 rpm
  • Air flow 9000 m 3 / h 9000 m 3 / h
  • Fineness of the product at 2 ⁇ m 82.30% 81.30% After one hour of operation, a small “eggshell” formation was found on the inspection door of the plant.
  • Classifier speed 2000 r / min 2000 r / min Air Flow: 12000 m 3 / h 12000 m 3 / h Air temperature: 44 ° C 45 0 C

Abstract

Disclosed is a method for manufacturing fine mineral powder products by means of systems composed of one or more air classifiers, dust separators such as cyclones (2) and/or filters (3), at least one fan (4), and pipes (5) or ducts that connect said devices to conduct air. The invention is characterized in that the relative humidity of the classifying air in the air classifier is maintained within a range of 15 to 35 percent.

Description

Beschreibung Titel: Verfahren zur Herstellung feiner mineralischer Pulverprodukte Description Title: Process for the production of fine mineral powder products
Die Erfindung betrifft ein Verfahren zur Herstellung feiner mineralischer Pulverprodukte mittels Anlagen, die aus einem oder mehreren Windsichtern, Staubabscheidern wie Zyklonen und/oder Filtern, mindestens einem Ventilator sowie den diese Apparate verbindenden Rohrleitungen oder Kanälen zum Luft- und Feststofftransport bestehen.The invention relates to a process for the production of fine mineral powder products by means of plants consisting of one or more air classifiers, dust collectors such as cyclones and / or filters, at least one fan and connecting these apparatus pipes or channels for air and solids transport.
Es können unterschiedliche Windsichter-Bauarten wie Zick-Zack-Sichter, Umluftsichter, Spiral- oder Abweiseradsichter eingesetzt werden.Different types of air classifiers such as zig-zag classifiers, air recirculation classifiers, spiral or deflector classifiers can be used.
In den Windsichtanlagen treten insbesondere bei der Sichtung von CaCO3 mit mittleren Partikelgrößen unter ca. 5μm häufig .an den. Bewandungen der von dem Luft- /Pulvergemisch durchströmten Anlagenteile wie dem Sichter selbst, den Luft- Feingutrohren oder -kanälen und anderen zu einer Windsichtanlage gehörenden Apparaten wie Zyklonen, Filtern und Ventilatoren harte, schalige Ablagerungen auf. Diese Ablagerungen wachsen meist zu schaligen Belägen (sogenannten "Eggshells"), aber auch zu zahnartigen Gebilden, bis sie von Zeit zu Zeit von den Bewandungen abplatzen und das meist hinsichtlich grober Rückstände spezifizierte Feinprodukt mit Plättchen von bis zu einigen mm Größe kontaminieren. Dies kann zu Reklamationen mit hohen wirtschaftlichen Schäden führen.In the air classifiers, in particular, the screening of CaCO 3 with average particle sizes below about 5 μm occurs frequently . to the . Irradiation of the system parts through which the air / powder mixture flows, such as the sifter itself, the air fines or channels and other apparatuses belonging to an air separation unit, such as cyclones, filters and ventilators, have hard, scaly deposits. These deposits usually grow into shell-like deposits (so-called "eggshells"), but also to tooth-like structures, until they peel off from the walls from time to time and contaminate the fine product which is usually specified with regard to coarse residues with platelets of up to a few mm in size. This can lead to complaints with high economic damages.
Diese Ablagerungen (nachfolgend pauschal als Eggshells bezeichnet) führen auch zu Un- wuchten an rotierenden Teilen in Windsichtanlagen wie den Sichtrotoren und den Ventilatorrotoren, was den Betrieb stark einschränkt bzw. zu hohen Kosten für die Reinigung und/oder das Auswuchten führt.These deposits (hereafter referred to as eggshells) also lead to imbalances on rotating parts in air classifiers such as the classifying rotors and the fan rotors, which severely limits the operation or leads to high costs for cleaning and / or balancing.
In EP 0037066 und in DE 2642884 , dort Anspruch 8, werden mechanische Vorrichtungen zur Abreinigung von statischen Teilen vorgeschlagen, was aber maschinenbaulich aufwändige Vorrichtungen bedingt und häufige Betriebsunterbrechungen erfordert. Auch können trotzdem vor und nach dem Abreinigen Eggshell-Partikel abbrechen. Oft werden daher die kontaminierten Produkte durch eine weitere Sichtung oder Siebung von den groben Partikeln befreit.' In EP 0037066 and DE 2642884, there claim 8, mechanical devices for cleaning of static parts are proposed, but this requires complex mechanical equipment and requires frequent interruptions in operation. Even so, eggshell particles can break off before and after cleaning. Often, therefore, the contaminated products are freed by further screening or screening of the coarse particles. '
Diese Maßnahmen sind aber sehr umständlich und mit hohem apparativen und teils hohem Energieaufwand verbunden, so dass es damit nicht gelingt, kostengünstig und permanent die Kontamination von Pulverprodukten mit Eggshells zu verhindern, insbesondere nicht im hier interessierenden Temperaturbereich der Sichtluft unterhalb von 1000C.However, these measures are very cumbersome and associated with high equipment and sometimes high energy consumption, so that it does not succeed, inexpensive and permanent to prevent the contamination of powder products with eggshells, especially not in the interest here temperature range of the classifying air below 100 0 C.
Die Aufgabe der Erfindung besteht daher darin, die eingangs erwähnten Ablagerungen und damit die mit ihnen verbundenen Nachteile zu vermeiden. Die - überraschende — Lösung dieser Aufgabe besteht erfindungsgemäß darin, dass die relative Feuchte (rF) der Sichtluft in dem Bereich von ca. 15% bis ca. 50%, vorzugsweise 15% bis ca. 35%, gehalten wird. Hierzu wird die rF in dem Sichter - und/oder an anderen Stellen der Anlage - gemessen und in Abhängigkeit von dem jeweiligen Messwert Wasser in die Sichtluft eingeführt.The object of the invention is therefore to avoid the deposits mentioned above and thus the disadvantages associated with them. The - surprising - solution of this task according to the invention is that the relative humidity (RH) of the classifying air in the range of about 15% to about 50%, preferably 15% to about 35%, is maintained. For this purpose, the RH is measured in the classifier - and / or at other points in the system - and water is introduced into the classifying air as a function of the respective measured value.
Die Anmelderin hat nämlich festgestellt, dass Eggshells bei geringerer rF der Sichtluft als ca.15% verstärkt auftreten. Deshalb wird erfindungsgemäß die rF der Sichtluft auf einen Wert oberhalb ca. 15% eingestellt.Namely, the notifying party has found that eggshells are more pronounced than about 15% at a lower RH of the classifying air. Therefore, according to the invention, the rF of the classifying air is set to a value above approximately 15%.
Ferner hat die Anmelderin erkannt, dass deutlich höhere Werte der rF als 50% einer größeren Wassermenge bedürfen und zu erhöhtem Risiko fuhren, dass in der Anlage an Stellen niedrigerer Temperatur der Taupunkt unterschritten wird. Dies würde zur Bildung von Wasser in flüssiger Form und damit zu Verbackungen und Schlammbildung fuhren, was letztlich zu einem Versagen des Prozesses führt. Um dies zu vermeiden sollen ca. 50%rF nicht überschritten werden.Furthermore, the Applicant has recognized that significantly higher values of RH than 50% require a larger amount of water and lead to an increased risk that the system will fall below the dew point at points of lower temperature. This would lead to the formation of water in liquid form and thus caking and sludge formation, which ultimately leads to a failure of the process. To avoid this, approx. 50% RH should not be exceeded.
Hierzu ist noch folgendes zu bemerken: Die aus der Umgebung angesaugte, kühle Frischluft wird im Sichter erwärmt. Dies insbesondere dann, wenn einTeil der (wärmeren) Sicht- luft von hinter dem Filter zum Sichtlufteinlass zurückgeführt wird. Dadurch sinkt die rela- tive Feuchte der Sichtluft im Sichter, je nach Frischlufttemperatur und -feuchte, auf Werte von oft unter 10% rF ab. Dies gilt besonders für aride Gebiete, in denen die Umgebungsluft von Natur aus sehr trocken ist, wie z.B. in Arizona/USA mit einer mittleren Jahres- feuchte von 14% rF. Je trockener die Sichtluft ist, um so trockener sind natürlich auch die in ihr befindlichen Partikel. Man sollte hierzu meinen, dass sich umso weniger Partikel an den Wandungen ablagern, je trockener die Partikel und die Wandungen sind. Denn trockene Partikel sind härter und spröder, sie sollten also weniger leicht an den Wänden haften, während feuchte Partikel aufgrund von Zwickelflüssigkeit leichter anhaften könnten, eine Befeuchtung wäre also kontraproduktiv. Entgegen dieser Erwartung wurde aber bei Tests festgestellt, dass sich - wie schon erwähnt - bei geringerer rF als ca.15% verstärkt Eggshells bilden, dass sich aber oberhalb von ca. 15% rF in der Sichtluft keine oder fast keine Eggshells im und hinter dem Auslass eines Sichters mehr bilden, also viel weniger oder gar kein Fehlkorn dieser Art mehr im Feingut vorhanden ist.The following is to be noted: The fresh air drawn in from the surroundings is heated in the classifier. This is especially true if part of the (warmer) sighting air is returned from behind the filter to the visible air inlet. As a result, depending on the fresh air temperature and humidity, the relative humidity of the classifying air in the classifier drops to values often below 10% RH. This is especially true for arid areas where the ambient air is naturally very dry, such as in Arizona / USA with a mean annual humidity of 14% RH. The drier the classifying air is, the drier the particles in it naturally are. One should think that the less dry the particles and the walls, the less particles are deposited on the walls. Because dry particles are harder and more brittle, so they should be less likely to adhere to the walls, while wet particles could adhere more easily due to gore fluid, so moistening would be counterproductive. Contrary to this expectation, however, it was found in tests that - as already mentioned - eggshells are formed at lower rF than approx. 15%, but that above approx. 15% rh in the classifying air there are no or almost no eggshells in and behind the Make the outlet of a classifier more, so much less or no false grain of this kind is more present in the fines.
Wissenschaftlich konnte dieses Phänomen bis heute noch nicht vollständig erklärt werden. Seitens der Anmelderin wurde bei Untersuchungen festgestellt, dass die Eggshells hauptsächlich von den kleinsten Partikeln im Größenbereich von einigen nm gebildet sind, und es wird vermutet, dass dies mit der triboelektrischen Aufladung der mineralischen Partikel zusammen hängt. Durch diese werden und bleiben nämlich auch vor allem sehr kleine Partikel dispergiert und können dann aufgrund der hohen Oberflächenkräfte (je größer die Oberfläche um so größer die Oberflächenkräfte) an Wandungen haften und zu den Eggshells zusammenwachsen. Durch die erfindungsgemäße Erhöhung der relativen Feuchte der Sichtluft wird deren Leitfähigkeit erhöht, wodurch Ladungen schneller ausgeglichen werden und so die feinsten Partikel im nm-Bereich in der sie umgebenden Luft wieder zu gröberen Partikeln reagglomerieren, statt an Bewandungen anzuhaften.Scientifically, this phenomenon has not yet been fully explained. The Applicant has found in studies that the eggshells are formed mainly of the smallest particles in the size range of a few nm, and it is believed that this is related to the triboelectric charging of the mineral particles. Because of these, very small particles are and will remain dispersed because of the high surface forces (the larger the surface the greater the surface forces) can adhere to walls and grow together to the eggshells. The inventive increase in the relative humidity of the classifying air whose conductivity is increased, whereby charges are compensated faster and thus reagglomerate the finest particles in the nm range in the surrounding air back to coarser particles, instead of adhering to walls.
Wie schon erwähnt soll aber die rF nicht über ca. 35% erhöht werden, da sonst die Kosten zu hoch und der Nutzen zu gering wären.As already mentioned, however, the RH should not be increased above about 35%, otherwise the costs would be too high and the benefits would be too low.
Ferner hat sich überraschend herausgestellt, dass sich bei Anwendung der Erfindung - bei sonst gleichen Bedingungen für den Aufgabegutmassenstrom, die Eigenschaften des Aufgabematerials, die Sichtluftmenge (und bei Zentrifugal-Abweiseradwindsichtern die Ro- tordrehzahl) - der Massenstrom des Feinprodukts und damit das sog. Feingutausbringen (Verhältnis aus dem Massenstrom von Feinpartikeln unterhalb einer bestimmten Partikelgröße und dem Massenstrom von Partikeln unterhalb dieser Partikelgröße im Aufgabegut) deutlich erhöht. Dies bedeutet durch den verminderten Energieaufwand zur Erzeugung einer bestimmten Produktmenge Kostenvorteile und es schont die Umwelt.Furthermore, it has surprisingly been found that when the invention is used - with otherwise identical conditions for the feedstock mass flow, the properties of the feed material, the amount of fresh air (and centrifugal Abweiseradwindsichtern the Roordordrehzahl) - the mass flow of the fine product and thus the so-called (Ratio of the mass flow of fine particles below a certain particle size and the mass flow of particles below this particle size in the feed material) clearly increased. This means by the reduced energy consumption to produce a certain amount of product cost advantages and it protects the environment.
Vorzugsweise erfolgt die Einstellung der relativen Feuchte vor ihrem Eintritt in den Sich- ter. Eine sehr einfache Ausführungsform der Erfindung besteht darin, dass in den Ansaugkanal für die Frischluft Dampf eingedüst wird. (Anspruch 2, Fig.l)The adjustment of the relative humidity preferably takes place before it enters the detector. A very simple embodiment of the invention is that in the intake duct for the fresh air steam is injected. (Claim 2, Fig.l)
Zur Erleichterung der Verdüsung kann das Wasser unter Hochdruck von 60 bis 115 bar und Tropfengrößen unter 30μm in den Ansaugkanal verdüst werden. (Anspruch 3)To facilitate atomization, the water can be sprayed under high pressure of 60 to 115 bar and droplet sizes below 30μm in the intake. (Claim 3)
Ferner kann dabei das Wasser auf eine Temperatur zwischen 50 C0 und 90 C° vorgeheizt werden. (Anspruch 4)Furthermore, the water can be preheated to a temperature between 50 C 0 and 90 C °. (Claim 4)
Zweckmäßig wird dabei der Ansaugkanäl so dimensioniert, dass sich Luftgeschwindigkei- ten zwischen 1m/s und 3m/s einstellen. (Anspruch 5)Suitably, the intake duct is dimensioned such that air speeds of between 1 m / s and 3 m / s are established. (Claim 5)
Gemäß einer anderen Ausführungsform der Erfindung wird die Sichtluft durch eine Luftbefeuchtungsemrichtung geleitet und damit die jeweils benötigte Wassermenge eingetragen (Anspruch 6).According to another embodiment of the invention, the classifying air is passed through a Luftbefeuchtungsemrichtung and thus entered the amount of water required in each case (claim 6).
Vorzugsweise weist dabei die Luftbefeuchtungseinrichtung wenigstens einen Schlauch oder ein Rohr aus für Wasser durchlässigem Material auf, durch den Wasser hindurchgeleitet und über dessen äußere Oberfläche Sichtluft geleitet wird (Anspruch 7). Dabei gelangt Wasser von der Innenseite auf die Außenseite des Schlauches bzw. Rohres, von wo • es von der vorbei strömenden Sichtluft aufgenommen wird.In this case, the air humidifying device preferably has at least one hose or a tube made of material permeable to water, through which water is passed and over whose outer surface the viewing air is passed (claim 7). In this case, water from where • it is taken up by the passing classifying air passes from the inside to the outside of the tube or pipe.
Eine solche Einrichtung ist z.B. von der AWS Air Water Systems AG in Villach, Österreich erhältlich.Such a device is e.g. available from AWS Air Water Systems AG in Villach, Austria.
Ein anderes Ausführungsbeispiel der Erfindung ist dadurch gekennzeichnet, dass der Großteil der Abluft des Filters in den Ansaugstutzen des Windsichters zurückgeführt wird und die Befeuchtung im Rückkanal erfolgt. (Anspruch 8, Fig.4) Dies kann auf einfache Weise so erfolgen, dass die Zugabe von Wasser über die relative Feuchte der Abluft, deren Temperatur und die Temperatur der Luft im Windsichter geregelt wird. (Anspruch 9)Another embodiment of the invention is characterized in that the majority of the exhaust air of the filter is returned to the intake manifold of the air classifier and the humidification takes place in the return duct. (Claim 8, Fig. 4) This can be done in a simple manner so that the addition of water on the relative humidity of the exhaust air, its temperature and the temperature of the air is controlled in the air classifier. (Claim 9)
Wie eingangs erwähnt liegt in der Praxis die Temperatur der Sichtluft in dem Bereich unterhalb 1000C. Diesbezüglich wird erfindungsgemäß eine weitere Verbesserung dadurch erreicht, dass die Temperatur der Luft im Bereich des Sichters zwischen 30 C° und 80 C° gehalten wird. In diesem Temperaturbereich ist der Aufwand für die Befeuchtung der Luft, d.h. die erforderliche Menge an Wasser und die für die Aufgabe von Wasser erforderliche Energie, relativ gering.As mentioned above, the temperature of the classifying air is in practice in the range below 100 0 C. In this regard, according to the invention a further improvement achieved in that the temperature of the air in the region of the separator between 30 C ° and 80 C ° is maintained. In this temperature range, the effort for the humidification of the air, ie the required amount of water and the energy required for the task of water, is relatively low.
Zweckmäßig wird dies mittels des Rückluftverhältnisses und der Temperatur des zugegebenen Wassers" erreicht/ (Anspruch 10). . ■ -This is conveniently achieved by means of the return-air ratio and the temperature of the water added "/ (claim 10) ■.. -
Das Aufgabegut kann aus einem Vormahlprodukt-Silo oder direkt aus einer vorgeschalteten Trockenmühle mit oder ohne Förderluft zugeführt werden.The feed can be fed from a pre-product silo or directly from an upstream dry mill with or without conveying air.
Ist dem Sichter unmittelbar eine Trockenmühle vorgeschaltet, so kann vorteilhaft die Müh- lenabluft dem Windsichter zugeführt werden und die Befeuchtung der Luft vor der Mühle (mit den unter Anspruch 2 bis 4 genannten Verfahren) erfolgen (Anspruch 11).If the sifter is directly preceded by a dry mill, then the mill exhaust air can advantageously be supplied to the air sifter and the air in front of the mill can be humidified (using the methods specified in claims 2 to 4) (claim 11).
Anhand der Zeichnungen wird die Erfindung noch näher beschrieben.With reference to the drawings, the invention will be described in more detail.
Fig. 1 zeigt ein Ausführungsbeispiel anhand einer einfachen Schaltung einerFig. 1 shows an embodiment with reference to a simple circuit of a
Windsichtanlage,Air separation plant,
Fig. 2 zeigt ein Ausführungsbeispiel, bei dem ein Teilstrom des den Zyklon verlassenden Luft/Pulvergemisches zum Eintritt des Windsichters zurückgeführt wird, Fig. 3 zeigt ein Ausfuhrungsbeispiel, bei dem sowohl ein Teilstrom des den Zyklon verlassenden Luft/Pulvergemisches als auch ein Teilstrom der Filterabluft zum Eintritt des Windsichters zurückgeführt wird,2 shows an embodiment in which a partial flow of the air / powder mixture leaving the cyclone is returned to the inlet of the air classifier, 3 shows an exemplary embodiment in which both a partial flow of the air / powder mixture leaving the cyclone and also a partial flow of the filter exhaust air are returned to the inlet of the air classifier,
Fig. 4 zeigt ein Ausfuhrungsbeispiel, bei dem nur ein Teilstrom der Filterabluft zum Eintritt des Windsichters zurückgeführt wird,4 shows an exemplary embodiment in which only a partial flow of the filter exhaust air is returned to the inlet of the air classifier,
Fig. 5 zeigt ein Ausfuhrungsbeispiel, bei dem vor den Windsichter eine Trockenmühle mit Belüftung vorgeschaltet ist, undFig. 5 shows an exemplary embodiment, in which a dry mill with ventilation is connected upstream of the air classifier, and
Fig. 6 zeigt ein Ausfuhrungsbeispiel mit Regelung der Feuchte der Luft im Wind- sichter.6 shows an exemplary embodiment with regulation of the humidity of the air in the windscreen.
Verallgemeinert besteht eine Windsichtanlage (Fig.l) aus einem Windsichter I5 einem Zyklon 2, einem Filter 3, einem Ventilator 4, den diese Aggregate verbindenden Rohrleitungen oder Kanälen 5 sowie Zu- und Abfuhreinrichtungen für Aufgabe- 6a, Fein- 6b und Grobgut 6c. Im Windsichter 1 wird das Aufgabegut getrennt in Grobgut und Feingut. Das Grobgut wird durch den Grobgut-Auslass 6c ausgelassen. Im Zyklon 2 wird das Feingut, welches meist das gewünschte Pulverprodukt darstellt, von der Sichtluft abgetrennt und mittels einer Förderschnecke 5c weitergefördert. Die Sicht- bzw. Zyklonabluft wird im Filter 3 entstaubt und mittels des Ventilator 4 ins Freie abgesaugt, der Feingutstaub wird in die Förderschnecke geleitet. Die Frischlufteintrittsöffnung 6d kann sich unmittelbar am Sichtergehäuse befinden oder an einem vorgeschalteten Frischlufteinlaufkanal. Je nach Windsichterbauart tritt in den Windsichter z.B. zum Zweck der Abdichtung auch noch so- genannte Falschluft ein.Generally speaking, an air separation plant (FIG. 1) consists of an air classifier I 5, a cyclone 2, a filter 3, a fan 4, the pipelines or channels 5 connecting these aggregates, and supply and discharge facilities for feed 6a, fine 6b and coarse material 6c , In the air classifier 1, the feed material is separated into coarse material and fine material. The coarse material is discharged through the coarse material outlet 6c. In the cyclone 2, the fine material, which usually represents the desired powder product, separated from the classifying air and further promoted by means of a screw conveyor 5 c. The visible or cyclone exhaust air is dedusted in the filter 3 and sucked by the fan 4 to the outside, the fines dust is fed into the screw conveyor. The fresh air inlet opening 6d can be located directly on the classifier housing or on an upstream fresh air inlet channel. Depending on the type of wind sifter, so-called false air may also enter the air classifier, for example for the purpose of sealing.
Erfindungsgemäß wird die relative Feuchte der Sichtluft in dem Bereich von 15% bis 35% gehalten. Gemäß Fig.l wird zu diesem Zweck Wasser in Form von Dampf oder in Tropfenform in die angesaugte Frischluft an der Stelle A, nämlich in die Frischluftzufuhr 6d eingedüst. Fig. 2 zeigt ein Ausführungsbeispiel, bei dem in an sich bekannter Weise ein Teilstrom des den Zyklon 2 verlassenden Luft/Pulvergemisches hinter einem Zyklonventilator 4a durch Rohrleitungen oder Kanäle 5a zum Frischlufteinlass 6d des Windsichters zurückgeführt wird. Hierbei hat es sich als vorteilhaft erwiesen, dass zur Befeuchtung und Kühlung der Sichtluft erforderliche Wasser an der Stelle B, nämlich in die Verbindungsleitung zwischen dem Zyklonventilator 4a und dem Frischlufteinlass 6d zuzugeben, da ein genügend langer Weg zur Verdunstung des Wassers gegeben ist. Aber auch bei dieser Schaltung kann durchaus erfolgreich Wasser unmittelbar in den Frischlufteinlass 6ά eingedüst werden.According to the invention, the relative humidity of the classifying air is maintained in the range of 15% to 35%. According to Fig.l water is injected for this purpose in the form of vapor or in the form of drops in the intake fresh air at the point A, namely in the fresh air supply 6d. 2 shows an exemplary embodiment in which, in a manner known per se, a partial flow of the air / powder mixture leaving the cyclone 2 is returned behind a cyclone fan 4a through pipes or channels 5a to the fresh air inlet 6d of the air classifier. It has proven to be advantageous that for humidification and cooling of the classifying air required water at the point B, namely in the connecting line between the cyclone fan 4a and the fresh air inlet 6d admit because a sufficiently long way to evaporate the water is given. But even with this circuit can be quite successfully injected water directly into the fresh air inlet 6ά.
Fig. 3 zeigt ein Ausführungsbeispiel, bei dem sowohl ein Teilstrom des den Zyklon verlassenden Luft/Pulvergemisches 5a als auch ein Teilstrom der Filterabluft 5b zum Frischluft- Eintritt 6d des Windsichters zurückgeführt wird. Hierbei erweist es sich als vorteilhaft, das zur Befeuchtung und Kühlung notwendige Wasser in den Rückluftstrom vom Filter 3 an der Stelle C, nämlich in die Verbindungsleitung zwischen dem Ventilator 4 und dem Frischlufteinlass 6d aufzugeben, da hierbei fast keine Staubpartikel mehr in der Rückluft vorhanden sind, die eventuell mit Tropfen koagulieren und dann als grobe feuchte Partikel den Prozess stören könnten. Auch bei dieser Luftführung kann das Wasser, ggf. nur ein Teilstrom, durchaus erfolgreich unmittelbar in den Frischlufteinlass 6d eingedüst werden.3 shows an exemplary embodiment in which both a partial flow of the air / powder mixture 5a leaving the cyclone and also a partial flow of the filter exhaust air 5b are returned to the fresh air inlet 6d of the air classifier. It proves to be advantageous to give the necessary for humidification and cooling water in the return air flow from the filter 3 at the point C, namely in the connecting line between the fan 4 and the fresh air inlet 6d, since this almost no dust particles are present in the return air which may coagulate with drops and then interfere with the process as coarse wet particles. Even with this air duct, the water, possibly only a partial flow, can be successfully injected directly into the fresh air inlet 6d.
Bei dem Ausführungsbeispiel nach Fig. 4 wird nur ein Teilstrom der Abluft des Filters zum Frischluft- Eintritt 6d des Windsichters 1 zurückgeführt. Hier erweist es sich als vorteilhaft, das zur Befeuchtung und Kühlung benötigte Wasser in die Rückluft 5b an der Stelle C, nämlich in die Verbindungsleitung 5b zwischen dem Ventilator 4 und dem Frischluft- einlass 6d einzugeben.In the embodiment of FIG. 4, only a partial flow of the exhaust air of the filter to the fresh air inlet 6 d of the air classifier 1 is returned. Here it proves to be advantageous to enter the water required for moistening and cooling in the return air 5b at the point C, namely in the connecting line 5b between the fan 4 and the fresh air inlet 6d.
Gemäß Fig. 5 ist der Windsichter 1 direkt mit einer belüfteten Mühle 7 gekoppelt und die Abluft der Mühle durch Rohrleitungen 8 zum Frischlufteintritt des Sichters geführt. Hierbei ist es vorteilhaft, die Befeuchtung der Luft bereits am Eintritt der Mühle vorzunehmen. Diese Maßnahme kann auch mit den vorgenannten Ausfuhrungsbeispielen gekoppelt werden. Fig. 6 erläutert prinzipiell, wie die erfindungsgemäße Regelung bei dem Ausführungsbei- spiel nach Fig. 4 durchgeführt werden kann. Die relative Feuchte und die Temperatur der Sichterabluft werden hinter dem Filterventilator 4 mittels Sensoren 10, und die Temperatur der Luft am Austritt des Sichters wird mittels eines Sensors 9 gemessen. Die relative Feuchte kann nämlich besser in staubfreier Luft gemessen werden. Aus diesen Messwerten wird Im Regler 11 aufgrund der bekannten Zusammenhänge zwischen Temperatur und Wasserbeladung die relative Feuchte im Sichter selbst berechnet, und demgemäß wird die Zufuhr von Wasser in die Rückluftleitung 5b so nachgeregelt, dass sich die gewünschte relative Feuchte im Sichter 1 einstellt.According to FIG. 5, the air classifier 1 is coupled directly to a ventilated mill 7 and the exhaust air of the mill is guided through pipes 8 to the fresh air inlet of the classifier. It is advantageous to make the humidification of the air already at the entrance of the mill. This measure can also be coupled with the aforementioned exemplary embodiments. FIG. 6 explains in principle how the control according to the invention can be carried out in the exemplary embodiment according to FIG. 4. The relative humidity and the temperature of the classifier exhaust air are measured behind the filter fan 4 by means of sensors 10, and the temperature of the air at the outlet of the classifier is measured by means of a sensor 9. The relative humidity can be better measured in dust-free air. Based on the known relationships between temperature and water loading, the relative humidity in the classifier itself is calculated from these measured values, and accordingly the supply of water into the return air line 5b is readjusted such that the desired relative humidity in the classifier 1 is established.
Mit den Anlagen nach Massgabe der vorhergehenden Figuren wurden verschiedene Testreihen gefahren, die zu den nachstehenden Resultaten führten.With the systems according to the preceding figures, various test series were run, which led to the following results.
1. Klassifikatfonsparameter für Versuch mit konditionierter Luft:1. Classification parameters for conditioned air test:
Sichtergeschwindigkeit: 3000 U/MinClassifier speed: 3000 rpm
Luftstrom: 1500O m3ZhAir flow: 1500O m 3 Zh
Lufttemperatur: 60°CAir temperature: 60 ° C
Relative Feuchtigkeit: 30% Absoluter Wassergehalt: 39 g/m3 Relative humidity: 30% Absolute water content: 39 g / m 3
Produktmassenstrom: 2,75 t/hProduct mass flow: 2.75 t / h
Feinheit des Prod. bei 2μm: 61,30%Fineness of the product at 2μm: 61,30%
Nach einer Stunde Betrieb fand sich keine „EggshelP'-Bildung an der Inspektionstür der Anlage.After one hour of operation, there was no "EggshelP" formation on the inspection door of the plant.
2. Klassifikationsparameter für Versuch mit nichtkonditionierter Luft:2. Classification parameter for unconditioned air test:
Sichtergeschwindigkeit: 3000 U/Min 3000 U/MinClassifier speed: 3000 rpm 3000 rpm
Luftstrom: 1500O m3Zh 1500O m3ZhAir flow: 1500O m 3 Zh 1500O m 3 Zh
Lufttemperatur: 6O0C 6O0CAir temperature: 6O 0 C 6O 0 C
Relative Feuchtigkeit: 6% 3%Relative humidity: 6% 3%
Absoluter Wassergehalt: 7,8 g/m3 3,3 gZm3 Absolute water content: 7.8 g / m 3 3.3 gm 3
Produktmassenstrom: 2,85 t/h 1,6 t/hProduct mass flow: 2.85 t / h 1.6 t / h
Feinheit des Prod. bei 2 um ι: 61,90% 54,90%Fineness of the product at 2 μm: 61.90% 54.90%
Nach einer Stunde Betrieb fand sich „EggshelP'-Bildung an der Inspektionstür der Anlage. 3. Klassifikationsparameter für Versuch mit konditionierter Luft:After one hour of operation, "EggshelP" formation was found on the inspection door of the plant. 3. Classification parameter for conditioned air test:
Sichtergeschwindigkeit: 3000 U/Min Luftstrom: 9000 m3/hClassifier speed: 3000 rev / min flow of air: 9000 m 3 / h
Lufttemperatur: 420CAir temperature: 42 0 C
Relative Feuchtigkeit: 35%Relative humidity: 35%
Absoluter Wassergehalt: 19,7 g/m3 Absolute water content: 19.7 g / m 3
Produktmassenstrom: 0,6 t/h Feinheit des Prod. bei 2μm: 81,70%Product mass flow: 0.6 t / h fineness of the product at 2μm: 81.70%
Nach einer Stunde Betrieb fand sich keine „EggshelP'-Bildung an der Inspektionstür der Anlage.After one hour of operation, there was no "EggshelP" formation on the inspection door of the plant.
4. Klassifikationsparameter für Versuch mit nichtkonditionierter Luft:4. Classification parameters for unconditioned air test:
Sichtergeschwindigkeit: 3000 U/Min 3000 U/MinClassifier speed: 3000 rpm 3000 rpm
Luftstrom: 9000 m3/h 9000 m3/hAir flow: 9000 m 3 / h 9000 m 3 / h
Lufttemperatur: 440C 4O0CAir temperature: 44 0 C 4O 0 C
Relative Feuchtigkeit: 11% 7%Relative humidity: 11% 7%
Absoluter Wassergehalt: 6,7 g/m3 3,7 g/m3 Absolute water content: 6.7 g / m 3 3.7 g / m 3
Produktmassenstrom: 0,55 t/h 0,15 t/hProduct mass flow: 0.55 t / h 0.15 t / h
Feinheit des Prod. bei 2 um: 82,30% 81,30% Nach einer Stunde Betrieb fand sich eine geringe „Eggshell"-Bildung an der Inspektionstür der Anlage.Fineness of the product at 2 μm: 82.30% 81.30% After one hour of operation, a small "eggshell" formation was found on the inspection door of the plant.
5. Klassifikationsparameter für Versuch mit konditionierter Luft:5. Classification parameter for conditioned air test:
Sichtergeschwindigkeit: 1800 U/MinClassifier speed: 1800 rpm
Luftstrom: 12000 mVhAir flow: 12000 mVh
Lufttemperatur: 450CAir temperature: 45 0 C
Relative Feuchtigkeit: 35%Relative humidity: 35%
Absoluter Wassergehalt: 21,5 g/m3 Absolute water content: 21.5 g / m 3
Produktmassenstrom: 4,35 t/hProduct mass flow: 4.35 t / h
Feinheit des Prod. bei 2μm: 43,10%Fineness of the product at 2μm: 43,10%
Nach einer Stunde Betrieb fand sich keine „Eggshell"-Bildung an der Inspektionstür der Anlage. 6. Klassifikationsparameter für Versuch mit nichtkonditionierter Luft:After one hour of operation, there was no "eggshell" formation at the inspection door of the plant. 6. Classification parameter for unconditioned air test:
Sichtergeschwindigkeit: 2000 U/Min 2000 U/Min Luftstrom: 12000 m3/h 12000 m3/h Lufttemperatur: 44°C 450CClassifier speed: 2000 r / min 2000 r / min Air Flow: 12000 m 3 / h 12000 m 3 / h Air temperature: 44 ° C 45 0 C
Relative Feuchtigkeit: 11% 5%Relative humidity: 11% 5%
Absoluter Wassergehalt: 6,8 g/m3 3,3 g/m3 Produktmassenstrom: 3,4 t/h 2,7 t/h Feinheit des Prod. bei 2μm: 5500,,7700%% 42,50%Absolute water content: 6.8 g / m 3 3.3 g / m 3 Product mass flow: 3.4 t / h 2.7 t / h Fineness of the product at 2 μm: 5500,, 7700 %% 42.50%
Nach einer Stunde Betrieb fand sich erste Anzeichen einer ersten „Eggshell"-Bildung an der Inspektionstür der Anlage. After one hour of operation, the first signs of a first "Eggshell" formation appeared on the inspection door of the plant.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
1 Windsichter1 air classifier
2 Zyklon2 cyclone
3 Filter3 filters
4 Ventilator4 fans
4a Zyklonventilator4a cyclone fan
5 / 5a Kanäle5 / 5a channels
5b Rückkanal vom Filter 3 zum Sichter 15b Return channel from filter 3 to sifter 1
5c Feingut-Förderschnecke5c fine material screw conveyor
6 Zu- und Abfuhreinrichtungen6 supply and removal facilities
6a Aufgabe-Zufuhr in den Sichter 16a task feeder into the sifter 1
6b Feingut - Abfuhr aus dem Sichter6b fine material - removal from the classifier
6c Grobgut —Abfuhr aus dem Sichter6c coarse material removal from the classifier
6d Frischluftzufuhr in den Sichter6d Fresh air supply into the sifter
7 Trockenrnühle7 dry mill
8 Rohre zw. Mühle 7 und Frischluftzufuhr 6d8 tubes between mill 7 and fresh air supply 6d
9 Temperatursensor9 temperature sensor
10 Sensor für Temperatur und relative Feuchte10 temperature and relative humidity sensor
11 Regler 11 controllers

Claims

Ansprüche claims
1 . Verfahren zur Herstellung feiner mineralischer Pulverprodukte mittels Anlagen, die aus einem oder mehreren Windsichtern, Staubabscheidern wie Zyklo- nen und oder Filtern, mindestens einem Ventilator sowie den diese Apparate verbindenden Rohrleitungen oder Kanälen zum Lufttransport bestehen, dadurch gekennzeichnet, dass die relative Feuchte der Sichtluft im Windsichter in dem Bereich von 15% bis 35% gehalten wird.1 . Process for the production of fine mineral powder products by means of plants consisting of one or more air classifiers, dust collectors such as cycloids and or filters, at least one fan and the pipes or ducts for air transport connecting these apparatuses, characterized in that the relative humidity of the classifying air in the Air classifier is maintained in the range of 15% to 35%.
2 . Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass in den Ansaugkanal (6d) für die Frischluft Dampf eingedüst wird.2. A method according to claim 1, characterized in that in the intake duct (6d) for the fresh air steam is injected.
3 . Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass Wasser unter Hochdruck von 60 bis 115 bar auf Tropfengrößen < 30μm in den Ansaugkanal (6d) verdüst wird.3. A method according to claim 1, characterized in that water is sprayed under high pressure of 60 to 115 bar to droplet sizes <30μm in the intake passage (6d).
4 . Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass das Wasser vor der Verdüsung auf Temperaturen zwischen 50 C° und 90 C° vorgeheizt wird.4. A method according to claim 3, characterized in that the water is preheated prior to atomization to temperatures between 50 ° C and 90 ° C.
5 . Verfahren nach Anspruch 3 und 4, dadurch gekennzeichnet, dass der Ansaugkanal (6d) so dimensioniert wird, dass sich Luftgeschwindigkeiten zwischen 1m/s und 3m/s einstellen.5. A method according to claim 3 and 4, characterized in that the suction channel (6d) is dimensioned so that adjust air velocities between 1m / s and 3m / s.
6. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Sichtluft durch eine Luftbefeuchtungseinrichtung geleitet und damit die jeweils benötigte Wassermenge eingetragen wird.6. The method according to claim 1, characterized in that the classifying air is passed through an air humidifier and thus the amount of water required in each case is entered.
7 . Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass die Luftbefeuchtungseinrichtung wenigstens einen Schlauch oder ein Rohr aus für Wasser durchlässigem Material aufweist, durch den bzw. durch das Wasser hindurch- geleitet und über dessen äußere Oberfläche Sichtluft geleitet wird. 7. A method according to claim 6, characterized in that the Luftbefeuchtungseinrichtung comprises at least one tube or a tube of water-permeable material, passed through the or through the water and is passed over the outer surface of view air.
8 . Verfahren nach Ansprüchen 1 bis 7, dadurch gekennzeichnet, dass der Großteil der Abluft des Filters (3) in den Ansaugstutzen (6d) des Windsichters zurückgeführt wird und die Befeuchtung im Rückkanal (5b, Fig.4) erfolgt.8th . A method according to claims 1 to 7, characterized in that the majority of the exhaust air of the filter (3) is returned to the intake port (6d) of the air classifier and the humidification takes place in the return duct (5b, Figure 4).
9 . Verfahren nach Ansprüchen 1 bis 8, dadurch gekennzeichnet, dass die Zugabe von Wasser über die relative Feuchte der Abluft, deren Temperatur und die Temperatur der Luft im Windsichter geregelt wird.9. Process according to Claims 1 to 8, characterized in that the addition of water is regulated by the relative humidity of the exhaust air, its temperature and the temperature of the air in the air classifier.
10 . Verfahren nach Ansprüchen 1 bis 9, dadurch gekennzeichnet, dass die Tem- peratur der Luft im. Windsichter mittels des Rückluftverhältnisses und der10. Process according to Claims 1 to 9, characterized in that the temperature of the air in the . Air classifier by means of the return air ratio and the
Temperatur des zugegebenen Wassers im Bereich zwischen 30 C° und 80 C0 gehalten wird.Temperature of the added water is maintained in the range between 30 C ° and 80 C 0 .
11 . Verfahren nach Anspruch 1, wobei dem Windsichter unmittelbar eine Tro- ckenmühle vorgeschaltet ist und die Mühlenabluft dem Windsichter zugeführt wird, dadurch gekennzeichnet, dass die Befeuchtung der Luft vor der vorgeschalteten Mühle erfolgt. 11. The method of claim 1, wherein the air classifier directly upstream of a dry mill and the mill exhaust air is fed to the air classifier, characterized in that the humidification of the air takes place in front of the upstream mill.
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WO2008055495A3 (en) 2009-01-22
PT2081699E (en) 2015-10-30
RU2459675C2 (en) 2012-08-27
RU2009122189A (en) 2010-12-20
NO339418B1 (en) 2016-12-12
IN266869B (en) 2015-06-10
DE102006053356B4 (en) 2011-03-17
MX2009004909A (en) 2009-07-24
JP5147023B2 (en) 2013-02-20
ES2547482T3 (en) 2015-10-06
CN101600514B (en) 2013-08-14
US20100294863A1 (en) 2010-11-25
KR101385837B1 (en) 2014-04-16
PL2081699T3 (en) 2016-01-29
WO2008055495A2 (en) 2008-05-15
DK2081699T3 (en) 2015-12-07
CA2668949C (en) 2016-01-05
US8393557B2 (en) 2013-03-12
KR20090089293A (en) 2009-08-21
NO20091982L (en) 2009-06-09
EP2081699B1 (en) 2015-08-19
JP2010509041A (en) 2010-03-25
HUE028127T2 (en) 2016-12-28
CA2668949A1 (en) 2008-05-15
SI2081699T1 (en) 2015-10-30
DE102006053356A1 (en) 2008-05-15

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