EP0379711B1 - Procédé de tri de matières fines et dispositif pour mettre en oeuvre le procédé - Google Patents

Procédé de tri de matières fines et dispositif pour mettre en oeuvre le procédé Download PDF

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Publication number
EP0379711B1
EP0379711B1 EP89123623A EP89123623A EP0379711B1 EP 0379711 B1 EP0379711 B1 EP 0379711B1 EP 89123623 A EP89123623 A EP 89123623A EP 89123623 A EP89123623 A EP 89123623A EP 0379711 B1 EP0379711 B1 EP 0379711B1
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EP
European Patent Office
Prior art keywords
gas
drum
particles
speed
mass
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP89123623A
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German (de)
English (en)
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EP0379711A1 (fr
Inventor
Roland Dr.-Ing. Nied
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Individual
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Individual
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Publication date
Priority claimed from DE19893915552 external-priority patent/DE3915552A1/de
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Priority to AT89123623T priority Critical patent/ATE73694T1/de
Publication of EP0379711A1 publication Critical patent/EP0379711A1/fr
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Publication of EP0379711B1 publication Critical patent/EP0379711B1/fr
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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

  • Comminution machines are known in which the particles to be comminuted are accelerated in a rapid gas flow and comminuted by colliding with one another or by impact on a target.
  • these constructions known as jet mills
  • jet mills put great effort into reducing the inherently higher energy requirements.
  • jet mills developed from this point of view result e.g. from TIZ departments, Vol. 109, No. 1, 1985.
  • Impact grinding is a widespread comminution process when the finest subtleties are to be achieved or the hardest materials are to be processed.
  • the rotor impact mills and the jet mills are available ("Speech Hall", Vol. 119, No. 7, 1986).
  • the drum speed cannot be increased arbitrarily.
  • the drum stands still and the gas carrying the good is introduced into the drum via nozzles with high energy so that forms a rotating flow with respect to the drum wall, which allows a separation between coarse and fine material in the mill, so that only finely ground material is discharged with the gas and through the discharge nozzle, which is fed to a classifier, classified and partly as fine material to be separated from the gas in a filter while the material rejected in the classifier is repeatedly treated until it has the mass of the fine material.
  • one way or the other should be aimed at defining the boundary between coarse and very fine material in such a way that the gas leaving the classifier via the discharge nozzle contains only solid particles with the lowest possible mass, while particles are still rejected, if they have already reached a relatively low mass in a less specific way.
  • a known spiral jet mill in which the material to be comminuted is held in a circular motion by means of propellant jets in a round grinding chamber and the finely ground material exits the chamber near the chamber axis in order to be fed to a classifier, is characterized in that material which has already been largely comminuted is given an increased rotational speed by additional blowing agent jets in a viewing zone lying between the outer grinding zone and the exit points, as a result of which the larger particles are returned to the grinding zone (DE-C-921 970).
  • the aim of this solution is to remove only very finely ground material from the mill and also to leave relatively finely ground particles as coarse material in the grinding process or to feed it to a new grinding process.
  • it is essential that the classification is within a mill and not a classification downstream of the mill and that the particles are accelerated exclusively with gas jets, that is to say exclusively pneumatically.
  • the parts of the material that still have a relatively large mass are first separated out from the material introduced into the classifier before the particles with a relatively low mass floating in the air flow as fine material enter a discharge nozzle by means of a classifying wheel, through which they are fed to a filter be, which holds back the fine material parts and allows the cleaned air to pass for reuse or further use.
  • the invention is now concerned with a classifier, that is to say a device connected downstream of a mill of any type. It is based on the object of making it possible for only very fine material with extremely low mass to be discharged from the classifier and for “fine material” to be rejected as belonging to the coarse material even if it is already regarded as fine material in current solutions and is fed to the filter .
  • the invention is intended to be one possibility show how a higher circumferential speed can be achieved for the gas rotating in the drum than is the case with the solutions with fixed or rotating drum, which are regarded as alternatives today, in order to have a relatively extremely small mass due to the centrifugal force that is developing Do not allow solid particles to emerge from the classifier, but instead again to the mass-reducing treatment.
  • the circumferential speed associated with the centrifugal force should be generated as rationally as possible.
  • the principle of the invention is the invention
  • the aim is to combine the two solution principles, which until now have only been viewed as alternatives, by first mechanically pre-accelerating a gas containing small particles to a certain circumferential speed, as is already the only measure for rotating drums, but that this acceleration involves a pulse transition between an additional one , faster gas flow and the pre-accelerated gas-good mixture. This results in a significant energy supply to the pre-accelerated good-gas mixture, the flow rate is increased and a fine-gas mixture is fed to the fine substance filtering, which contains particles with a much smaller mass than was previously achievable. The fine sighting is therefore significantly improved.
  • FIG. 1 a schematic side view
  • FIG. 2 an equally schematic top view.
  • An upright, cylindrical drum 1 can be driven with a suitable drive at high speed around its vertical longitudinal axis 2.
  • the desired target speed is 2000 rpm.
  • blades 3 are assigned in a constant division, which first deflect a gas flow radially introduced into the drum from any mill and enriched with fine dust, first deflecting it in the circumferential direction of the drum and then accelerating it on the way to the center of the drum. Concentric to the axis of rotation, the material discharge is guided into the classifier wheel from drum 1 and blading 3, which can be stationary or rotate with the drum.
  • the flow or peripheral speed of the good-gas mixture is now increased significantly beyond the value that can be achieved mechanically with the rotating drum, in that a certain number of nozzles 5, which are arranged tangentially and somewhat inclined downwards, correspond to this Gas-jet mixture already rotating at high speed are superimposed on gas jets, the raw gas flow being reduced by the volume fraction of the secondary air. It follows the mechanical acceleration of the raw gas flow, its pneumatic acceleration in the circumferential direction of the drum. The total acceleration is therefore much higher than with mechanical or pneumatic acceleration alone and only mass particles with extremely low mass are entrained in the material discharge.
  • the number of nozzles 5 provided depends on the circumstances of the individual case, but it is understandable that if a smaller nozzle cross section is selected, the number of nozzles can be larger than in the case of appropriately larger nozzle cross sections.
  • the mouths of the acceleration nozzles, which cause the at least approximately tangential gas outlet, lie in the virtual cylinder surface, which continues at the gas outlet into the interior of the drum.
  • the acceleration that can be achieved by the gas jets should be as high as possible, i.e. the gas jets should be blown into the drum at the highest possible speed.
  • the upper limit is the speed of sound, which is different for individual gases.
  • a medium should therefore preferably be used as the gas which only reaches the speed of sound at high speed, i.e. whose speed of sound has the highest possible value in order to impair the achieved values as little as possible by the compression of the gas. This is why air with an increased temperature of e.g. 200 ° C or superheated steam of 400 ° is an example of a guideline.
  • superheated steam is therefore also a gas.
  • a gas or a gas state comes into question in which the speed of sound is significantly higher than that of air at ambient temperature.
  • the proportion of gas should be at least about a quarter of the amount of output air, and it can be up to a factor of 2 larger.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)

Claims (4)

1. Procédé de triage d'un produit en forme de particules d'une masse extrêmement faible dans un courant de gaz, qui, en provenance d'un broyeur, est introduit et tourne dans un tambour de séparateur présentant de préférence un axe vertical, de sorte qu'à partir d'une certaine masse et sous l'effet de la force centrifuge engendrée, des particules de produit sont séparées en tant que produit grossier, tandis que du gaz avec des particules de produit d'une masse plus faible, à savoir du produit appelé produit fin, est amené à une sortie d'évacuation du produit, de forme tubulaire et disposée concentriquement à l'axe du tambour, pour parvenir à un filtre où s'effectue une séparation en gaz et produit fin, caractérisé en ce que le mélange produit-gaz introduit dans le tambour est accéléré initialement et de manière mécanique à une vitesse périphérique déterminée, et est ensuite accéléré jusqu'à la vitesse périphérique finale, par un échange impulsionnel entre des jets de gaz rapides supplémentaires introduits dans le tambour de manière sensiblement tangentielle et le mélange gaz-produit accéléré initialement.
2. Procédé selon la revendication 1, caractérisé par un type de gaz ou un gaz à un état tel que la vitesse sonique du gaz est nettement supérieure à celle de l'air à température ambiante.
3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la quantité de gaz accélérateur est égale au moins à environ 1/4 du volume de gaz se trouvant initialement dans le tambour et au maximum environ au double de ce volume.
4. Dispositif pour la mise en oeuvre du procédé selon l'une des revendications 1 à 3, caractérisé par une roue à aubes de séparateur en forme de tambour tournant autour de l'axe du tambour et faisant office de moyen d'accélération initiale du mélange gaz-produit, ainsi que des buses d'accélération destinées à envoyer d'un manière au moins sensiblement tangentielle dans le tambour en rotation, des jets de gaz supplémentaires, dans la zone de la surface cylindrique virtuelle prolongeant vers l'intérieur du tambour la sortie d'évacuation de gaz .
EP89123623A 1988-12-27 1989-12-20 Procédé de tri de matières fines et dispositif pour mettre en oeuvre le procédé Expired - Lifetime EP0379711B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89123623T ATE73694T1 (de) 1988-12-27 1989-12-20 Verfahren zur feinstsichtung und vorrichtung zur durchfuehrung des verfahrens.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3844008 1988-12-27
DE3844008 1988-12-27
DE19893915552 DE3915552A1 (de) 1989-05-12 1989-05-12 Verfahren zur feinstsichtung und vorrichtung zur durchfuehrung des verfahrens
DE3915552 1989-05-12

Publications (2)

Publication Number Publication Date
EP0379711A1 EP0379711A1 (fr) 1990-08-01
EP0379711B1 true EP0379711B1 (fr) 1992-03-18

Family

ID=25875734

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89123623A Expired - Lifetime EP0379711B1 (fr) 1988-12-27 1989-12-20 Procédé de tri de matières fines et dispositif pour mettre en oeuvre le procédé

Country Status (4)

Country Link
EP (1) EP0379711B1 (fr)
AT (1) ATE73694T1 (fr)
DE (1) DE58900995D1 (fr)
ES (1) ES2030258T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0694098A1 (fr) * 1993-04-16 1996-01-31 FONGEN, Sigurd Moyen de filtration et de fractionnement de suspensions contenant des fibres, des fragments de fibres, des particules fines et d'autres types de particules.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE921970C (de) * 1952-02-21 1955-01-07 Basf Ag Mahlvorrichtung
DE2651383A1 (de) * 1976-11-11 1978-05-18 Krauss Maffei Ag Schleuderteller fuer schuettgueter
DE3303078C1 (de) * 1983-01-29 1984-05-30 Alpine Ag, 8900 Augsburg Windsichter fuer den Feinstbereich

Also Published As

Publication number Publication date
ATE73694T1 (de) 1992-04-15
EP0379711A1 (fr) 1990-08-01
DE58900995D1 (de) 1992-04-23
ES2030258T3 (es) 1992-10-16

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