AT405374B - METHOD AND DEVICE FOR SEPARATING SOLIDS FROM A SUSPENSION - Google Patents
METHOD AND DEVICE FOR SEPARATING SOLIDS FROM A SUSPENSION Download PDFInfo
- Publication number
- AT405374B AT405374B AT0104395A AT104395A AT405374B AT 405374 B AT405374 B AT 405374B AT 0104395 A AT0104395 A AT 0104395A AT 104395 A AT104395 A AT 104395A AT 405374 B AT405374 B AT 405374B
- Authority
- AT
- Austria
- Prior art keywords
- filter
- filter cake
- vibrations
- rotary
- cake
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
- B01D33/073—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward flow filtration
- B01D33/09—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums arranged for inward flow filtration with surface cells independently connected to pressure distributors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/44—Regenerating the filter material in the filter
- B01D33/46—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element
- B01D33/466—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element scrapers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
- B01D33/62—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying
- B01D33/64—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by compression
- B01D33/646—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by compression by pressure rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
- B01D33/62—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying
- B01D33/66—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by gases or by heating
- B01D33/663—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by gases or by heating by direct contact with a fluid
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Drying Of Solid Materials (AREA)
Description
AT 405 374 BAT 405 374 B
Die Erfindung ist auf ein Verfahren und auf eine Vorrichtung zur Abtrennung von Feststoffen aus einer Suspension gerichtet, bei dem bzw. mit der mit Hilfe eines Drehfilters, das teilweise in die Suspension eintaucht, sich im eingetauchten Bereich des Drehfilters (Saugzone) durch angelegtes Vakuum und/oder Überdruck auf der Drehfilteroberfläche ein Feststoffkuchen aufbaut, der durch die Drehung des Drehfilters aus der Suspension herausgehoben wird und durch das Durchsaugen der umgebenden Gasatmosphäre, vorzugsweise Luft, weiter entwässert wird (Trockenzone) und der dann im weiteren Verlauf der Drehung des Drehfilters von der Oberfläche des Drehfilters abgenommen wird (Abnahmezone).The invention is directed to a method and to a device for separating solids from a suspension, in which or with the aid of a rotary filter that is partially immersed in the suspension, in the immersed area of the rotary filter (suction zone) by applied vacuum and / or overpressure builds up a solid cake on the rotary filter surface, which is lifted out of the suspension by the rotation of the rotary filter and is further dewatered by the suction of the surrounding gas atmosphere, preferably air (drying zone), and which then continues in the course of the rotation of the rotary filter Surface of the rotary filter is removed (removal zone).
Bei der Abtrennung von Feststoffen nach diesem bekannten Verfahren besteht aus Gründen der leichteren Filterkuchenabnahme vom Drehfilter sowie aus wirtschaftlichen Gründen, wenn der Filterkuchen nachfolgend thermisch getrocknet werden soll, das Ziel, den Filterkuchen möglichst trocken zur Abnahmezone zu bringen. Um dieses Ziel zu erreichen, gibt es eine Vielzahl von Varianten. So wird beispielsweise in der DE-Z "Der Deutsche Steinkohlenbergbau, Aufbereitung der Steinkohle, Zweiter Teil”, Verlag Glückauf GmbH, Essen, 1966 auf Seite 86 und 87 eine Möglichkeit beschrieben, bei der die Suspension, in die das Drehfilter eintaucht, erwärmt wird, um durch eine Herabsetzung der Viskosität und der Oberflächenspannung des Wassers eine Leistungssteigerung des Filters und eine Feuchtigkeitssenkung des Filterkuchens zu bewirken. Allerdings ist diese Verfahrensweise sehr teuer und die erreichten Vorteile nur gering.When separating solids by this known method, the goal is to bring the filter cake to the removal zone as dry as possible for reasons of easier filter cake removal from the rotary filter and for economic reasons if the filter cake is subsequently to be thermally dried. There are a variety of ways to achieve this. For example, in DE-Z "The German Coal Mining, Processing of Hard Coal, Second Part", Verlag Glückauf GmbH, Essen, 1966 on pages 86 and 87 describes a possibility in which the suspension in which the rotary filter is immersed heats up in order to bring about an increase in the performance of the filter and a decrease in moisture in the filter cake by reducing the viscosity and the surface tension of the water. However, this procedure is very expensive and the advantages achieved are only slight.
Eine andere Möglichkeit der Herabsetzung der Feuchtigkeit des Filterkuchens wird auf den Seiten 90 und 91 der gleichen Veröffentlichung beschrieben, und zwar wird hier nur der Filterkuchen auf dem Drehfilter durch Infrarotstrahlung oder durch Dampf erwärmt. Nachteilig bei diesem bekannten Verfahren ist insbesondere bei der Verwendung von Dampf die Notwendigkeit, das Drehfilter mit einem geschlossenen Gehäuse zu umgeben.Another possibility for reducing the moisture of the filter cake is described on pages 90 and 91 of the same publication, namely that only the filter cake on the rotary filter is heated by infrared radiation or by steam. A disadvantage of this known method, particularly when using steam, is the need to surround the rotary filter with a closed housing.
Da die Entfeuchtung des Filterkuchens auf dem Drehfilter in besonderem Maße von seiner Kapillarität (abhängig von der Filterkuchenstruktur und der Feinheit des Feststoffs) abhängig ist, wird in der DE-B-41 23 144 vorgeschlagen, den Filterkuchen nach der Filterkuchenbildungsphase mit einer Deckschicht aus arteigenem Material zu überschichten und dann den beschichteten Filterkuchen mit einem Preßdruck, der höher ist als der kapillare Eintrittsdruck der Deckschicht zur weiteren Entfeuchtung zu beaufschlagen.Since the dehumidification of the filter cake on the rotary filter is particularly dependent on its capillarity (depending on the filter cake structure and the fineness of the solid), it is proposed in DE-B-41 23 144 to filter the filter cake after the filter cake formation phase with a top layer of its own type Overlay material and then pressurize the coated filter cake with a pressure that is higher than the capillary inlet pressure of the cover layer for further dehumidification.
Ein anderer Weg zur Einflußnahme auf die Kapillarität des Filterkuchens wird in der DE-A-29 16 860 beschrieben, und zwar wird hier bei einem Bandfilter vorgeschlagen, den Aufbau des Filterkuchens so zu gestalten, daß zunächst der in der Suspension enthaltene Feststoff mittels einer Klassiervorrichtung in unterschiedliche Kornklassen aufgetrennt und dann die unterschiedlichen Kornklassen nacheinander von grob nach fein auf das Filter aufgelegt werden. Auf diese Weise wird eine Filterkuchenstruktur erreicht mit einer Porosität, die sich in Strömungsrichtung der abgetrennten Flüssigkeit vergrößert und für die Feuchtigkeit auch der feinen Kornklasse leicht durchlässig bleibt.Another way of influencing the capillarity of the filter cake is described in DE-A-29 16 860, namely that in the case of a belt filter it is proposed to design the filter cake in such a way that first the solid contained in the suspension by means of a classifying device separated into different grain classes and then the different grain classes are placed one after the other from coarse to fine on the filter. In this way, a filter cake structure is achieved with a porosity that increases in the direction of flow of the separated liquid and remains slightly permeable to moisture, even in the fine grain class.
Aufgabe der vorliegenden Erfindung ist es, ein Verfahren und eine Vorrichtung zu schaffen, mit dem bzw. mit der in konstruktiv einfacher und kostengünstiger Weise auf einem Drehfilter die Struktur des Filterkuchens im Sinne einer besseren Entfeuchtung verändert werden kann.The object of the present invention is to provide a method and a device with which the structure of the filter cake can be changed in a constructively simple and inexpensive manner on a rotary filter in order to improve dehumidification.
Die gestellte Aufgabe wird verfahrensmäßig gelöst mit den Maßnahmen des Kennzeichnungsteils des Anspruchs 1 und vorrichtungsmäßig mit den Merkmalen des Kennzeichnungsteils des Anspruchs 9. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen angegeben.The object is achieved in terms of method with the measures of the characterizing part of claim 1 and in terms of device with the features of the characterizing part of claim 9. Advantageous embodiments of the invention are specified in the subclaims.
Beim Betrieb des Drehfilters wird der in der Saugzone auf der Oberfläche des Drehfilters aufgebaute Filterkuchen nach dem Herausheben aus der Suspension in der darauffolgenden Trockenzone durch das Durchsaugen der umgebenden Gasatmosphäre, im Normalfall ist dies Luft, weiter getrocknet. Hierbei wird zunächst teilweise die noch vorhandene Kapillarflüssigkeit und dann, wenn die Trockenzone entsprechend lang gewählt ist, ein Teil der Oberflächenfeuchte entfernt.When the rotary filter is operated, the filter cake built up in the suction zone on the surface of the rotary filter is further dried after being lifted out of the suspension in the subsequent drying zone by sucking through the surrounding gas atmosphere, which is normally air. In this case, the capillary liquid that is still present is partially removed, and then, if the drying zone is selected to be long enough, some of the surface moisture is removed.
Je nach Struktur des Filterkuchens und seiner Porosität (Kapillarität) stellt sich, bedingt durch die zeitlich begrenzte Trockenzeit, ein Gleichgewicht zwischen der verbleibenden Kapillarfeuchte und der verbleibenden Oberflächenfeuchte ein, d. h. es verbleibt eine von der Trockenzeit und von der Filterkuchenstruktur abhängige, aus Kapillar- und Oberflächenfeuchte zusammengesetzte Endfeuchtigkeit des Filterkuchens, mit der der Filterkuchen von der Oberfläche des Drehfilters abgenommen wird.Depending on the structure of the filter cake and its porosity (capillarity), an equilibrium is established between the remaining capillary moisture and the remaining surface moisture, due to the time-limited drying time. H. there remains an end moisture of the filter cake which is dependent on the drying time and on the filter cake structure and is composed of capillary and surface moisture, with which the filter cake is removed from the surface of the rotary filter.
Da mit der fortschreitenden Austrocknung des Filterkuchens bei der Entwässerung in der Trockenzone auch in vielen Fällen eine Volumenschwindung des Filterkuchens verbunden ist, können sich durchgehende Risse im Filterkuchen ausbilden, durch die dann bevorzugt die Gasatmosphäre strömt und das Durchsaugen der Gasatmosphäre durch den übrigen Filterkuchen unterbleibt.Since the progressive drying of the filter cake during dewatering in the drying zone also results in volume shrinkage of the filter cake in many cases, continuous cracks can form in the filter cake, through which the gas atmosphere then flows and the gas atmosphere is not sucked through by the remaining filter cake.
Durch die erfindungsgemäße Maßnahme, im Bereich der Trockenzone und bevorzugt hier an einer Stelle, in der die Porenräume (Kapillaren) noch weitgehend mit Flüssigkeit gefüllt sind, den Filterkuchen in mechanische Schwingungen zu versetzen, läßt sich die Struktur des Filterkuchens gezielt so verändern, daß eine weitergehende Entwässerung des Filterkuchens durch eine verstärkte Freisetzung der Kapillarflüssigkeit erreicht wird und weiterhin, daß das Auftreten von Rissen unterbleibt, wobei, je nach Beschaffenheit der 2By means of the measure according to the invention, in the area of the drying zone and preferably here at a point in which the pore spaces (capillaries) are still largely filled with liquid, to set the filter cake in mechanical vibrations, the structure of the filter cake can be specifically changed so that a further dewatering of the filter cake is achieved by an increased release of the capillary fluid and furthermore that the occurrence of cracks does not occur, depending on the nature of the 2nd
Claims (9)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4422503A DE4422503A1 (en) | 1994-06-28 | 1994-06-28 | Sepn. of solids, e.g. coal particles, from fluid suspension |
Publications (2)
Publication Number | Publication Date |
---|---|
ATA104395A ATA104395A (en) | 1998-12-15 |
AT405374B true AT405374B (en) | 1999-07-26 |
Family
ID=6521641
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT0104395A AT405374B (en) | 1994-06-28 | 1995-06-19 | METHOD AND DEVICE FOR SEPARATING SOLIDS FROM A SUSPENSION |
Country Status (2)
Country | Link |
---|---|
AT (1) | AT405374B (en) |
DE (1) | DE4422503A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI111811B (en) * | 1998-06-05 | 2003-09-30 | Outokumpu Oy | Procedure for effective drying |
FI111810B (en) * | 1998-06-05 | 2003-09-30 | Outokumpu Oy | Method for enhancing drying |
ES2264215T3 (en) * | 1998-11-11 | 2006-12-16 | Consejo Superior De Investigaciones Cientificas | ULTRASONIC DEVICE FOR THE IMPROVEMENT OF SOLID-LIQUID SEPARATION PROCESSES IN SUSPENSIONS. |
EP1834682A1 (en) * | 2006-03-14 | 2007-09-19 | BOKELA Ingenieurgesellschaft für mechanische Verfahrenstechnik mbH | Device and method for filtration |
AT514597B1 (en) * | 2013-10-11 | 2015-02-15 | Andritz Ag Maschf | Filter for continuously filtering a suspension under pressure |
WO2017092777A1 (en) | 2015-12-03 | 2017-06-08 | Kronos International, Inc. | Method and device for improved solid-liquid filtration of filter cakes |
CN112892048B (en) * | 2021-01-21 | 2022-12-06 | 江苏中兴水务有限公司 | Hair collecting and treating device for sewage treatment |
CN113368581B (en) * | 2021-06-22 | 2022-09-02 | 重庆綦铝科技有限公司 | Resource-saving micro-filter |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE701769C (en) * | 1938-07-16 | 1941-01-23 | Johannes Wiebe | filter deer |
DE3325254A1 (en) * | 1982-07-26 | 1984-03-08 | Aktiebolaget Hedemora Verkstäder, Hedemora | Apparatus for the elimination of a fibre layer from a rotating disc filter |
US4946602A (en) * | 1987-04-16 | 1990-08-07 | Valmet Paper Machiney Inc. | Method of cleaning filter discs in a suction dryer using ultrasonic vibration |
EP0405562A2 (en) * | 1989-06-29 | 1991-01-02 | Outokumpu Oy | Method for cleaning the filter plates of a suction drier |
EP0569911A1 (en) * | 1992-05-14 | 1993-11-18 | TECNOFORME S.p.A. | Dynamic filter for treating contaminated fluids |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE975645C (en) * | 1941-03-23 | 1962-03-29 | Imp G M B H Maschf | Process for washing out and vacuuming or pressing dry and for avoiding cracks in the filter cake on rotary filters |
DE1016239B (en) * | 1952-03-21 | 1957-09-26 | Boerje Sune Nyquist | Method and device for dewatering suspensions |
DE1461475A1 (en) * | 1964-12-11 | 1969-07-31 | Sachtleben Ag | Compaction device for filter cakes on vacuum filters |
US4166034A (en) * | 1978-05-08 | 1979-08-28 | Bodine Albert G | Method and apparatus for sonically dehydrating precipitate |
DE2916860A1 (en) * | 1979-04-26 | 1980-11-06 | Weserhuette Ag Eisenwerk | Slurry filter with classifying action - passing slurry first through cyclone to lay coarse bed before fine material is added |
EP0058908A1 (en) * | 1981-02-23 | 1982-09-01 | Delkor Technik (Proprietary) Limited | Improved drying of filter cakes |
SU1005836A2 (en) * | 1981-10-06 | 1983-03-23 | Предприятие П/Я А-1216 | Drum-type vacuum filter |
DE4123144C1 (en) * | 1991-07-12 | 1992-11-19 | Werner Prof. Dr.-Ing. 6740 Landau De Stahl |
-
1994
- 1994-06-28 DE DE4422503A patent/DE4422503A1/en not_active Withdrawn
-
1995
- 1995-06-19 AT AT0104395A patent/AT405374B/en not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE701769C (en) * | 1938-07-16 | 1941-01-23 | Johannes Wiebe | filter deer |
DE3325254A1 (en) * | 1982-07-26 | 1984-03-08 | Aktiebolaget Hedemora Verkstäder, Hedemora | Apparatus for the elimination of a fibre layer from a rotating disc filter |
US4946602A (en) * | 1987-04-16 | 1990-08-07 | Valmet Paper Machiney Inc. | Method of cleaning filter discs in a suction dryer using ultrasonic vibration |
EP0405562A2 (en) * | 1989-06-29 | 1991-01-02 | Outokumpu Oy | Method for cleaning the filter plates of a suction drier |
EP0569911A1 (en) * | 1992-05-14 | 1993-11-18 | TECNOFORME S.p.A. | Dynamic filter for treating contaminated fluids |
Also Published As
Publication number | Publication date |
---|---|
DE4422503A1 (en) | 1996-01-04 |
ATA104395A (en) | 1998-12-15 |
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Legal Events
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EEIH | Change in the person of patent owner | ||
REN | Ceased due to non-payment of the annual fee |