EP0979152B1 - Procede et dispositif d'aero-separation - Google Patents
Procede et dispositif d'aero-separation Download PDFInfo
- Publication number
- EP0979152B1 EP0979152B1 EP98924234A EP98924234A EP0979152B1 EP 0979152 B1 EP0979152 B1 EP 0979152B1 EP 98924234 A EP98924234 A EP 98924234A EP 98924234 A EP98924234 A EP 98924234A EP 0979152 B1 EP0979152 B1 EP 0979152B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- flow
- carrier gas
- gas flow
- falling
- accordance
- 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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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
- B07B7/02—Selective separation of solid materials carried by, or dispersed in, gas currents by reversal of direction of flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N1/00—Pretreatment of moulding material
Definitions
- the invention relates to a method for windsifting separation of fibers containing particulate contaminants, in particular Wood fibers, according to the preamble of claim 1 and a device according to the preamble of claim 9 for performing this method.
- Fiber classifiers are known per se and an example of a device for dedusting and / or classifying visible material in an air stream is described in DE 40 40 561 C2.
- the well-known fiber classifier of this Kind to be desired with regard to the achievable degree of separation left and reach their performance limits when they are too removing contaminants adhere at least in part to the fibers and / or the differences in specific weights of each other separating particles are not very pronounced.
- the latex particles of different sizes to be found in the fiber material remove.
- Such latex particles are undesirable in the product because they the surface properties of MDF deteriorate.
- FR-A-1 242 444 a device is known with which products separated according to their grain size or weight, where on a product of different grain size or different Weight main stream meets an additional stream that forms an angle of 90 ° with the main stream. With the help of the additional Products with a smaller grain size or smaller will become a current Weight blown out of the main stream vertically.
- the object of the present invention is to provide a method for windsighting Separating particulate contaminants Fibers, especially wood fibers, to create unwanted Foreign particles such as latex particles, glue residues, metal parts, Sand and the like from the fiber raw material, for example Eliminate wood fibers, bar alley and the like with a high degree of certainty, to disturbances in the further course of the processing of these fiber materials as well as to avoid loss of quality of the manufactured products.
- the dissolved fibers and particulate contaminants with resulting downflow through the swirl-free carrier gas flow flows at an angle and practically full is preferably deflected by at least 90 °, since in this way the light fibers following the air flow from the merged Partial streams are taken away, while the heavier particles represent impurities to be removed due to the centrifugal force effect cannot take part in the sudden fiber deflection and continue their way down with only partial distraction and get into a discharge area.
- the separation of the fibers from the heavier contamination particles is further improved by the fact that in the area of the meeting of the two flows and the following flow deflection one as Cutting-edge separating and guiding surface is provided, which enables the fiber entrainment area from the separation area for the Separate impurities and also at least one post-classifier area to create another separation between fibers and contamination is possible.
- the latter purpose is in the discharge channel an increasing auxiliary air flow for the impurities created, which ensures the fiber entrainment from the forbearance area and then also combines with the carrier gas flow.
- Figure 1 shows a vertical feed channel 3 for an auxiliary gas flow 13, the dissolved fibers as well as particulate contaminants with it.
- the typical flow lines of the downflow are in FIG. 1 with 13 Flow lines of the carrier gas stream at 19, the flow lines of combined downflow and carrier gas flow with 25 and typical trajectories of separated particles designated 24.
- an adjustable Separating and guiding surface 6 provided with respect to the air flows acts as a cutting edge and thus also determines what proportion of the combined Downflow and carrier gas flow as outlet flow into the discharge line 11 and what proportion together with those who left Contamination is led into the lower discharge channel.
- the area of the wind-viewing chamber 5 preferably adjoins in the transition to the discharge line 11 an acceleration range 15, which by a reduction in free flow area is obtained.
- the Setting the free flow cross section is preferably done via an adjustable boundary wall 14.
- Particle-laden fiber air flow is preferably a Baffle 16, which can hit the heavier particles, the carrier gas stream Cross 18 without significant distraction.
- the others particles separated by centrifugal force come together with a fiber residue in the downward discharge channel, in this discharge channel preferably after-viewing areas 20, 21 are formed in the form of vortex zones.
- a counter air flow introduced from the lower discharge end 10 succeeds it is to achieve effective indulgence in this way means to separate unwanted particles from the remaining fiber and these residual fiber portions freed from the impurities upwards lead so that they enter the carrier gas stream and together with the main fiber stream are discharged free of impurities can.
- auxiliary gas flow 1, carrier gas stream 18 and fresh air stream supplied from below can be variably adjusted relative to each other to the respective optimal viewing result depending on the existing separation problem to optimize.
- Figure 2 shows an example of a possible embodiment of a concrete Device for carrying out the method according to the invention.
- the schematic drawing shows the posting point 1 at one Funnel that is loaded with fiber material loaded with pollutant particles.
- the feed device 2 takes place, for example, by means of suitable rollers the best possible dissolution of the fiber material, so that in this area already some of the disruptive particles from the fibers together with one Auxiliary gas flow is solved.
- the auxiliary gas flow that the fibers and the particulate contaminants in the form of an even and as possible swirl-free Carried downward flow in the direction of a wind viewing chamber 5 become.
- a feed line opens into this air classifier 5 4 for a carrier gas stream that is inclined perpendicular to the top coming, the fibers and the impurities with it Auxiliary gas flow hits.
- the auxiliary gas flow deflected by more than 90 ° arrives together with the carrier gas stream in the discharge line 11, which continues upwards.
- a guide surface arrangement 6 In the area of the flow deflection projecting into the air classifying chamber 5 a guide surface arrangement 6 is provided, the height and Angular position is adjustable. Below the air classifying chamber 5 and preferably is slightly offset laterally in the direction of the discharge line 11 extending in a vertically downwardly extending channel for receiving of the separated impurity particles is an aftermath area 7, below which a guide flap arrangement 8 is provided, by one introduced from the discharge opening 10 via the funnel area 9 and rising auxiliary air flow in the desired one Way to judge and a flow calming in the forbearance course to effect.
- the air flow introduced in three partial flows flows in the direction of the Discharge line 11 from the area of the classifier 5. Due to the reduction in cross section the air is brought up to in the classifier room 5 Cutting edge 6 accelerates. The cross section increases behind the cutting edge 6 in the classifier, and the flow is slowed down.
- the high speed creates in the upper area of the viewing section 7 of the carrier gas stream is a large-scale vortex, the expansion of which is limited by the installed baffles. Below the baffles 8 there is only a vertical upward flow the air towards the forbearance route 7.
- the surprisingly good separation effect of the device according to the invention is a consequence of the fact that for a wood fiber the relationship between inertial forces and the effective resistance forces is low and therefore the wood fiber can follow the sharp redirection of the airflow what does not apply to the impurities to be separated out.
- a device suitable for realizing the method according to the invention is characterized by a simple and compact system structure, unusually high degree of separation, safe and defined functionality both in recirculation and exhaust air operation, due to low Maintenance expenses, high adaptability to different Operating conditions and a low investment and energy expenditure.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Combined Means For Separation Of Solids (AREA)
- Preliminary Treatment Of Fibers (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Separation Of Gases By Adsorption (AREA)
Claims (14)
- Procédé d'aéroséparation de fibres contenant des impuretés en forme de particules, en particulier de fibres de bois, dans lequel :a) les fibres, conjointement à un courant de gaz auxiliaire dans un courant descendant sensiblement à la verticale, sont amenées dans un courant de gaz porteur orienté à l'encontre de ce courant descendant et entraínées par ce courant de gaz porteur,b) les impuretés en forme de particules se détachent des fibres à la suite de la déviation du courant descendant et parviennent à la séparation en dehors du courant de gaz porteur, tandis quec) les fibres purifiées sont séparées du courant de gaz auxiliaire et du courant de gaz porteur,(i) la conduite d'amenée pour le courant de gaz porteur est dirigée en biais depuis le bas contre le courant descendant, et(ii) en ce qu'il est prévu un courant de gaz porteur sensiblement exempt de tourbillons.
- Procédé selon la revendication 1, caractérisé en ce que les fibres contenant des impuretés en forme de particules, en particulier les fibres de bois, parviennent sous forme désagrégée dans le courant descendant à la verticale.
- Procédé selon l'une ou l'autre des revendications 1 et 2, caractérisé en ce qu'une petite partie réglable des fibres de bois contenant des impuretés en forme de particules est séparée du courant de gaz porteur sensiblement exempt de tourbillons et triée ultérieurement dans un courant tourbillonnaire.
- Procédé selon la revendication 3, caractérisé en ce que dans le courant tourbillonnaire sont formés des tourbillons lents et à grandes dimensions.
- Procédé selon l'une des revendications précédentes, caractérisé en ce que le courant de gaz porteur dirigé contre le courant descendant est constitué par un courant d'air de retour qui est composé au moins pour une part essentielle par le courant de gaz auxiliaire et de gaz porteur ramené qui est exempt de fibres de bois contenant des impuretés sous forme de particules.
- Procédé selon l'une des revendications précédentes, caractérisé en ce qu'à la région de réunion du courant descendant et du courant de gaz porteur est amené un courant d'air frais venant sensiblement à la verticale depuis le bas et entraínant des fibres provenant de la région de triage ultérieur et en ce que ce courant d'air frais est transporté conjointement avec le courant de gaz porteur et le courant descendant dévié.
- Procédé selon l'une des revendications précédentes, caractérisé en ce qu'on peut régler la quantité d'air et/ou la vitesse d'écoulement du courant descendant et du courant de gaz porteur pour optimiser le triage.
- Procédé selon l'une des revendications précédentes, caractérisé en ce que la vitesse d'écoulement du courant descendant et du courant de gaz porteur est augmentée après leur réunion.
- Dispositif pour la mise en oeuvre du procédé selon l'une ou plusieurs des revendications précédentes, comportant un tube de guidage (3) pour un courant descendant entraínant des fibres et des impuretés sous forme de particules, une conduite d'amenée (4) pour un courant de gaz porteur, une chambre d'aéroséparation (5) prévue dans la région de la rencontre du courant descendant et du courant de gaz porteur avec une conduite de transport (11) pour le courant de gaz porteur et pour le courant descendant, située approximativement dans le prolongement de la direction de la conduite d'amenée (4) pour le courant porteur, ainsi qu'une conduite d'évacuation pour les impuretés en forme de particules séparées, située au-dessous de la chambre d'aéroséparation (5),
caractérisé en ce que
la conduite d'amenée (4) pour le courant de gaz porteur forme avec le courant descendant un angle obtus de sorte que le courant de gaz porteur est dirigé en biais depuis le bas contre le courant descendant, et
en ce que le courant de gaz porteur est sensiblement exempt de tourbillons. - Dispositif selon la revendication 9, caractérisé en ce qu'il est prévu en dessous de la chambre d'aéroséparation (5) et en face de l'embouchure de la conduite de courant descendant (3) une région de surface d'impact (16) pour dévier des impuretés en forme de particules.
- Dispositif selon l'une ou l'autre des revendications 9 et 10, caractérisé en ce que dans la région de la chambre d'aéroséparation (5) est prévue une lame (6) réglable sous forme d'une surface de coupe et de guidage qui produit une séparation vive entre les particules à séparer et le matériau fibreux.
- Dispositif selon l'une des revendications 9 à 11, caractérisé en ce que la section transversale d'écoulement libre de la conduite de transport (11) est réglable à la suite de la chambre d'aéroséparation (5).
- Dispositif selon la revendication 12, caractérisé en ce que la section transversale d'écoulement libre de la conduite de transport (11) est variable par réglage d'une cloison de communication (14) entre la conduite d'amenée (3) du courant descendant et la conduite de transport (11).
- Dispositif selon l'une des revendications 9 à 13, caractérisé en ce qu'il est prévu en dessous de la chambre d'aéroséparation (5) et à l'intérieur de la conduite de transport, pour les impuretés en forme de particules séparées, au moins une région de triage (7) en formant une zone de tourbillons.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19718158 | 1997-04-29 | ||
DE19718158A DE19718158C2 (de) | 1997-04-29 | 1997-04-29 | Verfahren und Vorrichtung zum windsichtenden Separieren |
PCT/EP1998/002505 WO1998048950A1 (fr) | 1997-04-29 | 1998-04-28 | Procede et dispositif d'aero-separation |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0979152A1 EP0979152A1 (fr) | 2000-02-16 |
EP0979152B1 true EP0979152B1 (fr) | 2003-02-26 |
Family
ID=7828144
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98924234A Expired - Lifetime EP0979152B1 (fr) | 1997-04-29 | 1998-04-28 | Procede et dispositif d'aero-separation |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0979152B1 (fr) |
AT (1) | ATE233130T1 (fr) |
AU (1) | AU7650298A (fr) |
DE (2) | DE19718158C2 (fr) |
ES (1) | ES2189171T3 (fr) |
WO (1) | WO1998048950A1 (fr) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10025177B4 (de) * | 2000-05-24 | 2004-04-15 | Flakeboard Company Limited, St.Stephen | Verfahren und Vorrichtung zur Auflösung von Ungleichmäßigkeiten in Holzfaserströmen |
US6902125B2 (en) | 2000-05-24 | 2005-06-07 | Fritz Schneider | Process and device for disintegrating irregularities in flows of wood fibres |
DE10352119A1 (de) * | 2003-11-04 | 2005-06-09 | Focke & Co.(Gmbh & Co. Kg) | Verfahren und Einrichtung zum Sichten von Tabak |
DE102009054148B8 (de) * | 2009-11-23 | 2012-09-27 | Dieffenbacher GmbH Maschinen- und Anlagenbau | Verfahren und Vorrichtung zur Trocknung und Sichtung von trocken beleimten Fasern |
DE102011008757A1 (de) | 2011-01-17 | 2012-07-19 | Dieffenbacher GmbH Maschinen- und Anlagenbau | Verfahren und Vorrichtung zum Aussichten von Verunreinigungen aus einem pneumatischen Faserstrom |
EP2774655A1 (fr) | 2013-03-05 | 2014-09-10 | JAO beheer BV | Composition comprenant des particules de coquille d'oeuf de poule, préparation et utilisation |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1356777A (en) * | 1920-06-28 | 1920-10-26 | Sr Christoph Mettler | Grain-cleaner |
FR884549A (fr) * | 1941-08-06 | 1943-08-19 | Kloeckner Humboldt Deutz Ag | Dispositif de tamisage de matières en vrac, en particulier de la houille |
DE856402C (de) * | 1950-06-11 | 1952-11-20 | Saat & Erntetechnik Gmbh | Verfahren zur Erhoehung der Trennschaerfe eines Steigsichters und Steigsichter zur Durchfuehrung des Verfahrens |
US2834061A (en) * | 1954-05-07 | 1958-05-13 | Lummus Cotton Gin Co | Pneumatic fiber cleaning apparatus |
FR1242444A (fr) * | 1958-11-07 | 1960-09-30 | Polysius Gmbh | Dispositif pour la séparation de produits suivant la grosseur des grains ou suivant le poids |
DE1905106A1 (de) * | 1969-02-01 | 1970-08-20 | Bayer Ag | Verfahren und Vorrichtung zum Trennen eines mittels eines Foerdergasstromes transportierten Schuettgutes in einen Grob- und einen Feinanteil |
DE2754931A1 (de) * | 1977-12-09 | 1979-06-13 | Baehre & Greten | Mehrstufiger spantrenner |
US4657667A (en) * | 1984-04-05 | 1987-04-14 | The University Of Toronto Innovations Foundation | Particle classifier |
DE3912076A1 (de) * | 1989-04-13 | 1990-10-25 | Happle Gmbh & Co Maschf | Fliehkraftabscheider |
SE467044B (sv) * | 1990-09-28 | 1992-05-18 | Flaekt Ab | Saett och anordning foer avskiljning av tyngre partiklar fraan ett partikelformigt material |
DE4040561C2 (de) * | 1990-12-19 | 1995-10-05 | Luebke Gmbh | Vorrichtung zum Entstauben und/oder Klassieren von Sichtgut in einem Luftstrom |
DE4112556C1 (en) * | 1991-04-17 | 1992-06-17 | G. Siempelkamp Gmbh & Co, 4150 Krefeld, De | Spreading installation for chips, fibres etc. - has wind sifter for spreading flow coupled to spread material outlet shaft |
US5409118A (en) * | 1994-09-15 | 1995-04-25 | Beloit Technologies, Inc. | Open air density separator and method |
-
1997
- 1997-04-29 DE DE19718158A patent/DE19718158C2/de not_active Expired - Fee Related
-
1998
- 1998-04-28 ES ES98924234T patent/ES2189171T3/es not_active Expired - Lifetime
- 1998-04-28 DE DE59807320T patent/DE59807320D1/de not_active Expired - Fee Related
- 1998-04-28 WO PCT/EP1998/002505 patent/WO1998048950A1/fr active IP Right Grant
- 1998-04-28 EP EP98924234A patent/EP0979152B1/fr not_active Expired - Lifetime
- 1998-04-28 AT AT98924234T patent/ATE233130T1/de not_active IP Right Cessation
- 1998-04-28 AU AU76502/98A patent/AU7650298A/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
ES2189171T3 (es) | 2003-07-01 |
EP0979152A1 (fr) | 2000-02-16 |
WO1998048950A1 (fr) | 1998-11-05 |
AU7650298A (en) | 1998-11-24 |
DE19718158C2 (de) | 2003-04-24 |
ATE233130T1 (de) | 2003-03-15 |
DE19718158A1 (de) | 1998-11-05 |
DE59807320D1 (de) | 2003-04-03 |
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