EP0758931B1 - Umlenk-gegenstrom-sichter - Google Patents
Umlenk-gegenstrom-sichter Download PDFInfo
- Publication number
- EP0758931B1 EP0758931B1 EP95916577A EP95916577A EP0758931B1 EP 0758931 B1 EP0758931 B1 EP 0758931B1 EP 95916577 A EP95916577 A EP 95916577A EP 95916577 A EP95916577 A EP 95916577A EP 0758931 B1 EP0758931 B1 EP 0758931B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- sifter
- current
- counter
- bulk goods
- 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.)
- Revoked
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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
Definitions
- the invention relates to a deflection counterflow classifier the preamble of claim 1.
- So-called air classifiers are used for the dry classification of fine-grained solids are used.
- the separation feature is that Final velocity of the grains in the air.
- sifters can also be used to clean an mainly in the form of granules and particles bulk mixture containing different sizes be used.
- Because of different Manufacturing processes can bulk goods very have different distribution spectra. Lying there Plastics in the form of granules, which with abrasion or are mixed with dust particles. Is the size of the Granules in the order of about 2 to 5 mm for the diameter or the length of the granules, so the In contrast, dust particles only a size of z. B. 50 microns on.
- a well-known air classifier for the treatment of such substances is in DE 42 35 260 A1 with indication of further status described the technology.
- the invention has for its object that from the above Literature "process engineering" known state of the art Improve technology to make it even more efficient Separation between larger particles and especially one Plastic granules and the associated Contaminants such as splinters, dust, threads or the like is possible.
- This task is based on a diverting counterflow sifter according to the preamble of claim 1 by the characterizing features of claim 1 solved.
- the invention is based on the basic idea that a Sighting, d. H. a separation of different components only is sufficient if all areas of a bulk material flow can be detected. From the beginning "Process engineering", it is mentioned known that the air speed of a flow in a conveyor pipe towards the wall drops towards zero. This However, the technical effect is in a diverting countercurrent sifter neglected insofar as that in the Sifting room bulk material feed line penetrating from above concentric, d. H. is inserted in the middle so that the falling bulk flow is not in the anyway Wall area of the classifier arrives because it was previously from the ascending separation gas flow is detected and treated.
- the present invention takes a different approach to achieve this goal by the surface structure is designed such that increased turbulence in the Form wall area that to a possible rectangular velocity profile of the air flows to lead.
- the in the reference "Process engineering" specified zigzag shape of the air classifier itself for example as a surface structure on the Cylinder jacket surfaces applied in a suitable place to especially in the wall area to increased air turbulence respectively.
- a deflection-counterflow classifier 1 shows a deflection-counterflow classifier 1 according to the invention, which consists of a vertically oriented, cylindrical classifier cylinder 2 with a longitudinal axis 3 of symmetry.
- the entire deflection-counterflow classifier 1 has a height h 1 , the classifier cylinder 2 a height h 2 .
- a bulk material conveying pipe 5 with a height h 3 is concentrically let in, which is located above the height h 4 within the classifier cylinder 2.
- the vertical bulk material conveying pipe 5 has an upper deflection flange 6, from which a connecting piece 7 leads laterally to a pneumatic bulk material feed line 8.
- the bulk material feed pipe 5 and / or the bulk material feed line 8 can also be referred to as a "bulk material feed line”.
- a central tube 9 with a height h 5 is located within the classifier cylinder.
- the central tube 9 is fastened in the lower region of the classifier cylinder 2 by means of cross-shaped fastening webs 10.
- a conical tip 11 extends to the lower edge of the upper deflection flange 6.
- a conical outlet funnel 12 with a height h 6 which is extended upwards by a cylinder tube 13 with a height h 7 .
- a gas inlet connector 14 is arranged on the side of the cylinder tube 13. The classifying cylinder 2 protrudes approximately over the height h 7 into the cylinder tube 13.
- the cylinder tube 13 has a diameter d 1 , which is greater than the diameter d 2 of the lower part 15 with a height h 8 of the classifying cylinder 2.
- This air is guided upwards in the counterflow classifier and first reaches an annular channel 19 of the lower cylindrical part 15 of the classifier cylinder 2 with the height h 8 .
- This ring channel 19 is formed by the central tube 9, which projects into the cylindrical part 15 at a height h 9 .
- the annular channel cross section results from the difference from the diameter d 2 of the cylinder section 15 minus the diameter d 3 of the central tube 9.
- the lower cylindrical section 15 tapers over a first truncated cone 20 with the height h 10 and a second truncated cone 21 with the height h 11 to a second cylinder section 23 with the height h 12 .
- the air flow 18 drawn in in the lower part of the classifier cylinder 2 is consequently first compressed in the annular channel 19 to a smaller cross section (arrows 22) before it is further reduced in cross section via the two truncated cone sections 20, 21 and is thus greatly accelerated.
- the two truncated cone sections 20, 21 therefore serve with their narrowing cross section to accelerate the separating gas flow 25.
- the annular channel 24 with the height h 12 consequently forms a cylindrical section 23 with a diameter d 4 , which is used as a line of sight or separating distance for the bulk material Conveying line 5 coming bulk material is used.
- the cylindrical section 23 for forming the ring channel 24 ends just above the lower edge 26 of the bulk material conveying pipe 5, ie just above the mouth 26 of the bulk material flow in the classifier cylinder 2. This height difference is designated by h 13 .
- the cylindrical section 23 is followed by an expanding third truncated cone 27 with the height h 14 , which acts as an accelerating diffuser and which in turn is followed by a cylindrical section 28 with the height h 15 and a diameter d 5 .
- the cylindrical section 28 has an upper end region 29 through which the opening 4 for the bulk material conveying pipe 5 is guided.
- another ring channel 30 is formed, which opens laterally in a conveying material outlet connection 31.
- a narrow annular channel 32 is formed, which has a height h 16 , ie it extends from the lower mouth 26 to the conical shoulder 33 of the conical tip 11.
- arrow 34 is the inflow direction of the diverting countercurrent classifier 1 supplied bulk material flow in the Bulk material delivery line specified.
- the arrow 35 shows the Supply of the amount of air sucked in or blown in is required as separation gas stream 25 for screening.
- the arrow 36 represents the outflow direction of the fines from the Conveyed goods outlet connection 31 represents that cleaned from the fines Coarse material falls through the line of sight in the counterflow classifier down and is schematic with arrow 37 in Fig. 1 shown.
- the lower outlet 38 of the conical outlet funnel 12 is closed by an outlet aperture 39. It can also a cellular wheel sluice, not shown, is provided be.
- the decisive factor is the air flow of the supplied or sucked air through the counterflow classifier in vertical Direction.
- the gas inlet connector 14 can also have a throttle element 40 to the transported in the countercurrent classifier To be able to regulate separation gas flow 25.
- FIG. 2 is the mouth region of the bulk material conveying pipe 5 in the sifter cylinder 2 in schematic Representation shown and explained in more detail below.
- the left half of the figure shows an arrangement according to the state the technology, while the right half of the figure Innovation according to the invention relates.
- For simplified representation was made on the inclusion of the Truncated cone 27 waived.
- the bulk material flowing into the bulk material conveying tube 5 is divided by the conical tip 11 of the central tube 9 and reaches the annular channel 32.
- the annular channel 32 is formed by the cylindrical outer surface 41 of the bulk material conveying tube 5 with the diameter, which is radially outer relative to the annular channel 32 d 6 and the cylinder jacket surface 42 of the central tube 9 with the diameter d 3, which is located radially on the inside relative to the ring channel 32.
- This ring channel 32 forms an acceleration path for the bulk material flow supplied, ie the amount of air in the ring gap including the entrained solid particles is accelerated to a speed c, as is described in more detail in the “Process Engineering” reference to the deflection counterflow classifier.
- the separating gas stream 25 coming from below also forms a speed profile 46, which is established in the annular channel 24 below the mouth 26.
- the flow velocity V G of the separation gas flow in the wall areas approaches zero, since the flow profile 46 drops sharply in the direction of the wall sections.
- the result of this is that there is only a slight upward flow of the separating gas flow 25 in the annular channel 24, in particular on the radially inner cylinder jacket surface 42, which is indicated by the speed arrow 47.
- fine material 49 falling down can penetrate the insufficiently present separating gas stream 25 there almost without hindrance and undesirably reaches the lower area of the counterflow classifier.
- both the radially outer lateral surface 41 and the radially inner lateral surface 42 are initially provided with a surface structure 50 in the annular channel 32, which leads to strong turbulence of the air flow in these wall areas.
- the speed profile 43 ' is not designed to drop sharply towards the wall areas, but rather is designed in the manner of a rectangle with almost equally large speed vectors c also in the respective edge areas.
- the result of this is that the total quantity of conveying gas, including entrained solid particles, is brought to the required high speed in the acceleration section in the ring channel 32, so that the coarse material 48 also has the required speed c max in the wall area. in order to penetrate the separating gas stream 25 directed from the bottom upwards. This means there is less loss of coarse material.
- the wall section 42 of the central pipe 9 lying below the mouth 26 of the delivery pipe 5 also has a corresponding surface structure 50 ′, which corresponds to the surface structure 50 lying above it.
- This also results in a speed profile 46 ′ in the annular channel 24, which has a substantially steeper profile, in particular in the region of the radially inner wall section 42, which is generated by corresponding turbulence.
- a higher separation gas flow speed V GW is present in this wall area, which prevents fine material 49 from falling. 2 on the right half of the figure, both a discharge of coarse material 48 with the fine material 49 into the ring channel 30 and a discharge of fine material 49 into the lower region of the classifier are avoided. This increases the effectiveness and efficiency of such a classifier considerably.
- the surface structure 50 can also be made by other suitable ones Measures are roughened or formed so corresponding turbulence to generate turbulence arise. This can be done by hammering, for example formed surface with indentations in the form of spherical segments or a wave structure with a pointed wave crest or the like. Other swirl edges can also be used be provided.
- the surface structuring 50 within the ring channel 32 preferably extends over a height section h 17 which covers the entire acceleration distance, ie the entire ring channel 32. As a result, all particles are subjected to the acceleration required in order to achieve a desired final speed, even in the edge region.
- a turbulence-generating surface structure 50 'on the radially inner wall section 42, ie on the outer cylindrical surface of the central tube 9, is essentially necessary, since this area is influenced by the flow of conveyed material from the ring channel 32 above.
- the height h 18 of the roughened surface structure 50 'for generating turbulence is therefore chosen in a similar order of magnitude as the height section h 17 .
- the gas inlet connector 14 if possible in the lower region of the Circulating countercurrent classifier 1 arranged to a possible long distance for the ascending separation gas flow 18, 22, 25 to obtain. Furthermore, this route can be used to generate a Acceleration of this separation gas flow due to Diffuser effect can be used. After all, one long distance of the separation gas flow the effect of a Have indulgence of fines, d. H. Fines which the Separation path in the ring channel 24 has nevertheless penetrated in a lower section due to the ascending countercurrent can be detected.
Landscapes
- Combined Means For Separation Of Solids (AREA)
Description
- Fig. 1
- eine Gesamtansicht eines Umlenk-Gegenstrom-Sichters im Längsquerschnitt und
- Fig. 2
- eine vergrößerte Darstellung der Sicht-Zone des Sichters, wobei die linke Figurenhälfte den Stand der Technik und die rechte Figurenhälfte eine erfindungsgemäße Ausbildung darstellt.
- 1
- Umlenk-Gegenstrom-Sichter
- 2
- Sichterzylinder
- 3
- Symmetrielängsachse
- 4
- Öffnung
- 5
- Schüttgut-Förderrohr
- 6
- Umlenkflansch
- 7
- Anschlußstutzen
- 8
- Schüttgut-Zuführleitung
- 9
- zentrales Rohr
- 10
- kreuzförmige Befestigungsstege
- 11
- kegelförmige Spitze
- 12
- Auslaufsstutzen/trichter
- 13
- Zylinderrohr
- 14
- Gaseinsatzstutzen
- 15
- Unterer Teil von 2
- 16
- Ringkanal
- 17
- Luftführungsbleche
- 18
- Luft/Pfeil
- 19
- Ringkanal
- 20
- 1. Kegelstumpf
- 21
- 2. Kegelstumpf
- 22
- Pfeil/Luft
- 23
- zylindrischer Abschnitt
- 24
- Ringkanal
- 25
- Trennungsstrom
- 26
- Unterkante/Mündung
- 27
- 3. Kegelstumpf
- 28
- zylindrischer Abschnitt
- 29
- Abschlußbereich
- 30
- Ringkanal
- 31
- Fördergut-Auslaßstutzen
- 32
- Ringkanal
- 33
- Kegelansatz
- 34
- Pfeil
- 35
- Pfeil
- 36
- Pfeil
- 37
- Pfeil
- 38
- Auslauf
- 39
- Auslaufblende
- 40
- Drosselorgan
- 41
- radial außenliegende Mantelfläche
- 42
- radial innenliegende Mantelfläche
- 43
- Geschwindigkeitsprofil
- 44
- Pfeil
- 45
- Pfeil
- 46
- Strömungsprofil
- 47
- Geschwindigkeitsprofil
- 48
- Grobgut
- 49
- Feingut
- 50
- Oberflächenstruktur
- 51
- Pfeil
- 52
- Spitze
Claims (11)
- Umlenk-Gegenstrom-Sichter mit einem zylindrischen, vertikal ausgerichteten Sichterzylinder (2) in dessen oberen Bereich konzentrisch ein Schüttgut-Förderrohr (5) eintaucht, welches wenigstens in seinem unteren Mündungsbereich (26) eine innere, ringkanalförmige Beschleunigungsstrecke (32) für den mittels eines Fördergases transportierten Schüttgutstrom aufweist, wobei dem Fördergasstrom ein von unten nach oben gerichteter Trenngasstrom ringkanalförmig entgegengerichtet ist, der zur Auftrennung des Schüttgutstromes in leichtere und schwerere Bestandteile dient und wobei die leichteren Bestandteile (49) durch einen das Schüttgut-Förderrohr (5) umgebenden Ringkanal (30) nach oben aus dem Sichterzylinder (2) transportierbar sind, während schwerere Schüttgutteile (48) den Trenngasstrom (25) durchdringen und nach unten in den Sichterzylinder (2) gelangen, dadurch gekennzeichnet, daß wenigstens die radial innenliegende Zylindermantelfläche (42) der ringkanalförmigen Beschleunigungsstrecke (32) wenigstens im unteren Mündungsbereich (26) des Schüttgut-Förderrohrs (5) und/oder wenigstens die radial innenliegende Zylindermantelfläche (42) des den Trenngasstrom (25) führenden Ringkanals (24) jeweils eine Oberflächenstruktur (50, 50') aufweist, die zu einer erhöhten Turbulenz und damit zu einer Geschwindigkeitserhöhung der jeweiligen Luftströmung am jeweiligen Wandungsabschnitt führt.
- Umlenk-Gegenstrom-Sichter nach Anspruch 1, dadurch gekennzeichnet, daß die radial innenliegende (42) und die radial außenliegende (41) Zylindermantelflächen des ringförmigen Beschleunigungskanals (32) im Schüttgut-Förderrohr (5) eine als Oberflächenaufrauhung ausgebildete Oberflächenstruktur (50) aufweisen, die zu einer erhöhten Turbulenz des Schüttgut-Fördergases im Wandbereich führt.
- Umlenk-Gegenstrom-Sichter nach Anspruch 1 oder 2 dadurch gekennzeichnet, daß die ringförmige Beschleunigungsstrecke (32) im Schüttgut-Förderrohr (5) und die ringkanalförmige Strömungsstrecke (24) für den Trenngasstrom (25) durch ein im Sichterzylinder (2) konzentrisch angeordnetes zentrales Rohr (9) insbesondere mit kegelförmiger Spitze (11) gebildet sind.
- Umlenk-Gegenstrom-Sichter nach Anspruch 3, dadurch gekennzeichnet, daß das zentrale Rohr (9) wenigstens im Bereich der Mündung (26) des Schüttgut-Förderrohrs (5) in den Sichterzylinder (2) einen sich nach oben und nach unten erstreckenden Wandungsabschnitt (42) mit der Höhe h17, h18 aufweist, der eine Oberflächenstruktur (50, 50') zur Erzeugung erhöhter Luftströmungsturbulenzen und damit erhöhter Teilchengeschwindigkeiten umfaßt.
- Umlenk-Gegenstrom-Sichter nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Oberflächenstruktur (50, 50') zur Erzeugung erhöhter Luftströmungs-Turbulenzen als Zick-Zack-förmige Oberflächenaufrauhung ausgebildet ist, wobei der Abstand a zwischen zwei benachbarten Spitzen (52, 52') kleiner als der größte Durchmesser D bzw. Teilchenlänge des Grobgutanteils (48) ist.
- Umlenk-Gegenstrom-Sichter nach einem der vorhergehenden Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Oberflächenstruktur im Querschnitt als Wellenstruktur mit spitzen Wellenkamm ausgebildet ist.
- Umlenk-Gegenstrom-Sichter nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Oberflächenstruktur Verwirbelungskanten aufweist.
- Umlenk-Gegenstrom-Sichter nach Anspruch 1, dadurch gekennzeichnet, daß zur Bildung einer Nachsichtstrecke die radiale Einlaßöffnung (14) für den Trenngasstrom (25) im unteren Bereich des Gegenstrom-Sichters angeordnet ist.
- Umlenk-Gegenstrom-Sichter nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Sichterzylinder (2) in seinem unteren Bereich einen Auslauftrichter (12) mit nach oben fortgesetzten Zylinderabschnitt (13) aufweist, der seitlich einen radial einlaufenden Gaseinlaßstutzen (14) für den Trenngasstrom aufweist und daß der Trenngasstrom über Luftleitbleche (17) in den Sichterzylinder (2) umlenkbar ist.
- Umlenk-Gegenstrom-Sichter nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der konische Auslauftrichter (12) eine verschließbare Auslauföffnung (38) aufweist.
- Umlenk-Gegenstrom-Sichter nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß dem Gaseinlaßstutzen (14) ein Drosselorgan (40) zugeordnet ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4416757A DE4416757C2 (de) | 1994-05-13 | 1994-05-13 | Umlenk-Gegenstrom-Sichter |
DE4416757 | 1994-05-13 | ||
PCT/DE1995/000575 WO1995031294A1 (de) | 1994-05-13 | 1995-04-26 | Umlenk-gegenstrom-sichter |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0758931A1 EP0758931A1 (de) | 1997-02-26 |
EP0758931B1 true EP0758931B1 (de) | 1998-02-11 |
Family
ID=6517955
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95916577A Revoked EP0758931B1 (de) | 1994-05-13 | 1995-04-26 | Umlenk-gegenstrom-sichter |
Country Status (4)
Country | Link |
---|---|
US (1) | US5788083A (de) |
EP (1) | EP0758931B1 (de) |
DE (2) | DE4416757C2 (de) |
WO (1) | WO1995031294A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19740013C1 (de) * | 1997-09-11 | 1999-06-24 | Waeschle Gmbh | Schüttgutsichter |
DE102004020379A1 (de) * | 2004-04-23 | 2005-11-10 | Coperion Waeschle Gmbh & Co. Kg | Schüttgut-Sichter |
DE102017203089A1 (de) * | 2017-02-24 | 2018-08-30 | Coperion Gmbh | Förderanlage und Verfahren zum Fördern von Kunststoffgranulat |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3441131A (en) * | 1965-10-18 | 1969-04-29 | Scient Separators Inc | Particle separation apparatus and method |
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 |
DE2405298A1 (de) * | 1974-02-04 | 1975-08-07 | Kloeckner Humboldt Deutz Ag | Verfahren und vorrichtung zur standzeiterhoehung von schleissteilen in sichtern, zyklonen und rohrleitungen |
SU848093A1 (ru) * | 1979-11-12 | 1981-07-23 | Харьковский Инженерно-Экономическийинститут | Пневматический классификатор |
DE3540682A1 (de) * | 1985-11-16 | 1987-05-21 | Leybold Heraeus Gmbh & Co Kg | Zick-zack-sichter |
DD249646A1 (de) * | 1986-06-04 | 1987-09-16 | Nagema Veb K | Windsichter |
JPH0525717Y2 (de) * | 1987-04-06 | 1993-06-29 | ||
JP2509374B2 (ja) * | 1990-07-23 | 1996-06-19 | 株式会社クボタ | 粉粒体分級装置 |
DE4235260A1 (de) * | 1992-10-20 | 1994-04-21 | Buehler Gmbh | Vorrichtung zum Reinigen eines im wesentlichen in Granulatform vorliegenden Korngemenges und Verfahren zum Reinigen dieses Korngemenges |
-
1994
- 1994-05-13 DE DE4416757A patent/DE4416757C2/de not_active Expired - Lifetime
-
1995
- 1995-04-26 US US08/732,390 patent/US5788083A/en not_active Expired - Fee Related
- 1995-04-26 DE DE59501453T patent/DE59501453D1/de not_active Revoked
- 1995-04-26 EP EP95916577A patent/EP0758931B1/de not_active Revoked
- 1995-04-26 WO PCT/DE1995/000575 patent/WO1995031294A1/de not_active Application Discontinuation
Also Published As
Publication number | Publication date |
---|---|
EP0758931A1 (de) | 1997-02-26 |
DE4416757C2 (de) | 1997-04-10 |
DE59501453D1 (de) | 1998-03-19 |
DE4416757A1 (de) | 1995-11-16 |
WO1995031294A1 (de) | 1995-11-23 |
US5788083A (en) | 1998-08-04 |
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