• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to filters for continuously filtering a suspension under pressure with a pressure vessel (1), rotatable filter elements (2), which are arranged in the pressure vessel (1), wherein a filter element (2) for each rotation passes through a filter cycle, the filter zones in liquid and gaseous phase, further comprising filtrate channels (4 ') connected between the filter elements (2) and separate filtrate outlets (14, 15) for each filtering zone, and means for controlling the individual filtrate zones by means of control disc (44), the Control disc (44) Filtratauslässe for liquid and gaseous phase has. It is primarily characterized in that, viewed in the direction of the filter cycle, a deaeration zone (46) is provided in front of the filtrate outlet of the liquid phase. In this way, the compressed air contained in the filter elements (2) and filtrate tubes (4 ') can be dissipated and relaxed in a favorable manner.
    公开号:AT514597A4
    申请号:T784/2013
    申请日:2013-10-11
    公开日:2015-02-15
    发明作者:Rainer Dr Prader
    申请人:Andritz Ag Maschf；
    IPC主号:
    专利说明:

    Filter for continuously filtering a suspension under pressure
    The invention relates to a filter for continuously filtering a suspension under pressure with a pressure vessel, rotatable filter elements, which are arranged in the pressure vessel, wherein a filter element for each rotation passes through a filter cycle having filter zones in the liquid and gaseous phase, further with filtrate between the filter elements and separate Filtratauslässen for each filter zone are connected, and a means for controlling the individual filtrate zones by means of control disk, wherein the control disk Filtratauslässe for liquid and gaseous phase has.
    Filters of the above type are used as pressure filters for dewatering u.a. However, pulp suspensions also increasingly used by suspensions with mineral solids such as coal or ores to a higher degree of dewatering, i. to achieve a higher dry content. An example of a pressure filter for pulp suspensions is described in DE 36 14 668 A1. Here, a pressure disk filter is shown, but in principle pressure drum filter can be applied. A filtration cycle usually consists of so-called cake formation, i. Structure of a filter cake or in pulp suspensions of a filter mat on the filter element. The following is generally spoken of filter cake, but this also includes a filter mat made of fibers in the same way. This cake formation can also take place in several stages, as described in DE 36 14 668 Al. Another variant of a pressure filter is described in EP 0 596 857 A1. After setting up the filter cake, it is blown through with air. In Vakuumfiltem here the liquid contained in the filter cake is sucked out, pushed through with Druckfiltem by the higher pressure. As the next stage in the filtration cycle, a washing of the filter cake can still be provided, in which case the washing liquid is again removed from the filter cake by the pressure difference (vacuum or internal pressure of the kettle) applied to the filter element. Subsequently, the filter cake is removed from the filter element, which can be done by water or air jets (fiber mat), a compressed air recoil or scraper. Then a new filtration cycle begins. At the beginning of the filtration cycle it must now be ensured that the filter cell and the filtrate tube, on which several filter cells can also be arranged, are vented. In the case of pressure filtration, the volume of the filter cell (s) and the filtrate tube is below the working pressure in the vessel. As a result, the venting takes place by the pressure release to the pressure prevailing outside the boiler atmospheric pressure at the beginning of the cake-forming zone abruptly and leads to significant pressure surges, turbulence and turbulence in the cake-forming zone. The expanding amount of air is usually much larger in volume than the amount of filtrate to be removed in the cake-forming zone.
    The aim of the invention is now to offer a device which prevents this disadvantage.
    The invention is therefore characterized in that, in the direction of the filter cycle, a deaeration zone is provided before the filtrate outlet of the liquid phase (cake-forming zone). This separate discharge of the system air before the actual cake formation, the cake-forming zone can be calmed, resulting in a much more uniform cake structure, since the pressure shocks are avoided.
    An advantageous development of the invention is characterized in that the separate Filtratauslässe are connected to Abscheidebehältem, which are arranged at a lower level, wherein the separation vessel via so-called barometric downcomers having a vertical length of 6 to 10 m, be connected to the Filtratauslässen can. The barometric downpipes also called barometric or geodesic foot, creates an additional suction pressure in the cake-forming zone, which subsequently leads to better drainage and / or increased throughput.
    A favorable embodiment of the invention is characterized in that the venting zone is connected via a separate line with the separating vessel. As a result, it can be ensured that the expanding compressed air is discharged separately from the system and, as a consequence, almost exclusively a liquid column exists in the downpipes, whereby the barometric suction pressure remains ensured. If too much air is contained in the downpipes, this liquid column would break off and no suction pressure could build up.
    The invention will now be described by way of example with reference to the drawings, in which Fig. 1 shows a pressure filtration plant according to the prior art,
    Fig. 2 shows the structure of a control head according to the prior art
    Fig. 3 is a control disk according to the invention, and
    Fig. 4 is a schematic view of an arrangement according to the invention.
    1 shows a pressure filter based on a disk filter by way of example with a filter disk according to the prior art. Of course, the invention can also be applied to disc filters with a plurality of filter disks or drum filters in which the filter cells are arranged over the circumference of a drum. In this pressure filtration system, for example, mineral suspension is sucked from an ore or coal preparation from a reservoir 20 with stirrer 32 'at a corresponding form of the pump 21 and pumped from above via a Filtrataufgabevorrichtung 30 in the filter trough 3. The filter trough 3 is installed in a pressure vessel 1. The trough 3 is driven to avoid Feststoffaufkonzentrationen with permanent overflow 12 and drain 13. The flow through the filter trough 3 with turbidity or the turbidity homogenization is supported by an agitator 18. The flow rate of the slurry feed pump 21 is automatically set by the regulated via a frequency converter electric motor as a function of the pulp overflow. The turbid overflow quantity is detected by a flow measuring point 37. The overflow stream 12 and the downcomer 13 flow with a gravimetric gradient into a suspension collecting container 31 with stirrer 32 formed as a pressure stirring container. Turbidity can be conveyed from the pressure container 31 back to the feed container via a level-controlled pump (not shown) with submerged suction pipe or only by means of a pressure trap. As a working medium the filter 2 compressed air from a compressed air station, e.g. fed to an air compressor 23. The air can still be brought by means of a heater 24 to the necessary temperature before entering the pressure chamber. The filter 2 is a hollow filter disc rotating on the shaft with adjoining separate sectors whose interiors are each provided with a separate Filtratabführung. The shaft is formed in a conventional manner on one side of the filter disc as a hollow shaft, in the interior of which Filtratabführleitungen are guided and, arranged in a Stimabdeckscheibe the hollow shaft,
    Dispensing openings open, which are arranged at equal intervals from each other along a circumference. The Stimabdeckscheibe forms the rotating part of the control head. Alternatively, the Filtratableitungen can also be designed as outside of the shaft circumference arranged filtrate tubes, which open into the arranged in the Stimabdeckscheibe the hollow shaft, discharge openings.
    During operation of the filter disk 2, in the immersion region of the filter disk 2, the liquid / liquid mixture contained in the filter trough 3 is filtered so that liquid is forced through the filter layer into the interior of the affected sectors, while solid material is deposited as a layer 19 (filter cake) on the filter surface. accumulates. In the pressure vessel 1 outside the immersion region of the filter disk 2, pressurized gas is forced through the built-up solid layer and leads the liquid still in the solid layer (filter cake) into the interior of the affected sectors.
    Thus, in the filtering process, on the one hand, virtually pure liquid - the cake-forming filtrate - and on the other hand a gas / liquid mixture - the dehumidifying filtrate - fall, the liquid content of which is generally lower, the longer the relevant sector has emerged from the filter trough 3.
    As a rule, cake-forming filtrate and dehumidifying filtrate are removed separately from one another. For this purpose, the control head on a fixed counter-disc to Stimabdeckscheibe the hollow shaft on which the Stimabdeckscheibe slides snugly and which is equipped with circumferential slots that lead on the one hand, the dispensing openings of Stimabdeckscheibe, the cake-forming filtrate, and on the other hand, the discharge openings of Stimabdeckscheibe drove the dehumidifying filtrate , so that the two filtrates can be guided essentially via separate discharges.
    The cake-forming filtrate 14 with the smallest possible amounts of air flows into a filtrate 25, into which the dehumidifying filtrate 15 is also introduced after cooling in the air / gas cooler 27, in which condensate is formed. The exhaust air stream flows out at Filtratabscheider 25 at 26 above. The separated filtrate / condensate mixture can be disposed of accordingly. The dewatered solid (e.g., ore, coal concentrate) is discharged through a gate valve 7, 8, 8 ', 9. The one from the filter disc 2 e.g. by means of snap-blow valve 28 and compressed air from the snap-blow compressor 29 removed filter cake falls over both sides of the filter disc 2 mounted chutes 5 in a discharge funnel 6. The snap-blow detachment of filter cake is a known method in which the filter material by a Compressed air burst is jerked against the direction of filtration, which causes the dewatered filter cake to flake off. Alternatively, the filter cake can also be scraped off the filter cloth by scrapers and introduced into the discharge funnel 6. From the discharge funnel 6, the filter cake enters the lock original tank 7. Alternately, now a sluice gate 8, 8 'is opened or closed, whereby the filter cake passes first into the sluice intermediate chamber 9 and then to Filterkuchenaustrag 10. The sluice gate valves 8, 8 'are operated by a hydraulic unit 34. The discharged filter cake 19 'is e.g. transported away by a conveyor belt 35. The amounts of air, steam, suspension supply, - overflow, - deduction and filtrate can be controlled by control valves 36 and the corresponding lines are also completely shut off.
    Fig. 2 shows schematically the structure of a control head with control disk and filter shaft. The control head is generally designated 38. The removal of the dehumidifying filtrate via spigot (line) 15, while the cake-forming filtrate is divided into a cloudy filtrate 14 and a clear filtrate 14 '. The nozzles or pipes 14, 14 'are designed as barometric downcomers and subsequently connected to a filtrate separator (not shown). The control head 38 consists essentially of a hollow cylindrical part 39 with a flange 40 on the inlet side and a flange 41 on the outlet side. Here, a desired distribution of turbid filtrate 14 and clear filtrate 14 'is achieved especially by a splitter 42 with sealing strip 43. The filter shaft 4 is equipped with individual filtrate drainage channels 4 ', wherein alternatively a shaft with a smaller diameter and external filtrate tubes can be used. Through the Filtratablaufkanäle 4 ', the liquid from the individual filter segments is collected and fed to the end of the filter where it is fed to the control head 38. The filtrate runs through a control disk 44, which regulates the timing of cake formation and dehumidification and Kuchenabblasung. Here, the cake-forming zone 14 with respect to the dehumidifying zone 15 is formed very long, since here the dry content of the solid plays only a minor role compared to the recovery of the (clear) filtrate.
    3 now shows a control disk 44 analogous to the control disk in FIG. 3. The control disk has a dehumidifying zone 15 and a cake-forming zone 14. While the cake-forming zone 14 is in operation substantially below the liquid level of the suspension to be dehydrated, the dehumidifying zone 15 is above this level. This results in that in the cake-forming filtrate little air, but in the dehumidifying filtrate primarily air is contained. After the filter cake has been dry-vacuumed in the dehumidifying zone 15, a compressed-air repulsion takes place via the opening 45 in the control disk 44. In the direction of the filter cycle, a venting zone 46 is arranged in front of the cake-forming zone 14. This serves to relax the compressed air contained in the filter segment and the associated Filtratrohr (filtrate channel) 4 'to atmospheric pressure without coming into contact with the cake-forming zone 14. Since only air is present, it is thus also possible to prevent the wear of the leading edge of the cake-forming zone 14 and thus substantially increase the service life of the control disk 44 and of the control head.
    Fig. 4 shows schematically the arrangement of a pressure filter with pressure vessel 1 and, for example, filter discs 2, which dip into a filter trough 3. Basically, of course, a drum filter can be used. The cake-forming zone is connected to a filtrate separator 25 with a line 14 ', the filtrate separator 25 being arranged at a substantially lower level than the pressure vessel 1 with filter trough 3, resulting in a so-called barometric downpipe. Depending on the installation and design of the filter, the height difference (and thus the vertical length of the barometric downpipe) can be between 6 and 10 m. The dehumidifying zone is also connected to the Filtratabscheider 25 with a line 15 '. The venting zone according to the invention is connected to the filtrate separator with a likewise separate line 4Γ. Thus, all of the escaping air at the top of the filtrate 25 can be conveyed via a conduit 26, e.g. be directed into the open. Since the expanded (compressed) air is now discharged separately from the filter elements and filtrate tubes, it is also possible to maintain a continuous filtrate flow in the cake filtrate line 14 'and thus an additional vacuum. This increases compared to the prior art, the effective differential pressure in the cake-forming zone and it can be an increase in throughput of about 5 -15% can be achieved. Furthermore, the angle for the dehumidification zone can be increased, which in addition leads to a dry content increase of about 1 - 2%.
    Specifically, by the realization that by the relaxation of the air in the filter elements and Filtratroheren both turbulence in the cake forming zone as well as no continuous Filtratstrom could be achieved in the downcomers and the now separate discharge of this relaxation air in a separate venting zone can be the first barometric Height as well as a turbulence-free suspension for better drainage of particular mineral solid-liquid suspensions can be used.
    The invention is not limited to the illustrated examples, but can be applied in particular also in drum filters but also in other continuous Druckfiltem.
    权利要求:
    Claims (4)
    [1]
    1. A filter for continuously filtering a suspension under pressure with a pressure vessel (1), rotatable filter elements (2), which are arranged in the pressure vessel (1), wherein a filter element (2) for each rotation passes through a filter cycle, the filter zones in liquid and gaseous phase, further comprising filtrate channels (4 ') connected between the filter elements (2) and separate filtrate outlets (14, 15) for each filtration zone, and means for controlling the individual filtrate zones by means of the control disc (44); Control disk (44) Filtratauslässe for liquid and gaseous phase, characterized in that in the direction of the filter cycle seen before the Filtratauslass the liquid phase, a venting zone (46) is provided.
    [2]
    2. Filter according to claim 1, characterized in that the separate Filtratauslässe (14 ', 15') with Abscheidebehältem (25) are connected, which are arranged at a lower level.
    [3]
    3. Filter according to claim 2, characterized in that the separation vessel via so-called barometric downpipes (14 ', 15') having a vertical length of 6 to 10 m, are connected to the Filtratauslässen.
    [4]
    4. Filter according to one of claims 1 to 3, characterized in that the venting zone (46) via a separate line (46 ') with the separating vessel (25) is connected.
    类似技术:
    公开号 | 公开日 | 专利标题
    AT398389B|1994-11-25|METHOD AND SYSTEM FOR SEPARATING SOLID / LIQUID MIXTURES
    EP0093203B1|1986-01-15|Installation for the removal of solid impurities from cooling water for power stations, etc.
    DE3540336C2|1994-01-27|Rotating disc filter
    AT514597B1|2015-02-15|Filter for continuously filtering a suspension under pressure
    DE1517392A1|1969-08-07|Method and device for suspension separation in water treatment
    WO2001093981A1|2001-12-13|Centrifuge with sieve and method for operating said centrifuge
    EP0073076B1|1988-10-12|Method for continuously thickening suspensions
    DE2630639A1|1977-02-03|METHOD AND DEVICE FOR SEPARATING A MINERAL GRAIN MIXTURE IN AQUATIC MEDIUM
    DE3119456C2|1988-08-11|
    DE1875987U|1963-07-18|DECANTER AND / OR SCREEN CENTRIFUGE.
    DE2165657A1|1972-07-20|Device for concentrating solids present in a liquid
    EP3165596B1|2019-07-24|Method for purifying beer and beer purifier
    DE898888C|1953-12-07|Drum suction filter with partial vacuum control through liquid shut-off
    DE322149C|1920-06-21|Method and device for recovering finely divided substances from a liquid in the form of a cake
    DE252331C|
    DE362636C|1922-10-30|Nutsche filter to separate the solid from the liquid components in the treatment of slurries of the most varied kinds
    DE1039495B|1958-09-25|Device for separating liquids and solids
    DE4336426A1|1995-04-27|Process and plant for the continuous cross-flow filtration of suspensions in the area of standard filtration
    DE2001594A1|1971-07-22|Depositing filter material in alluvial filters
    EP2223723B1|2013-04-10|Method and device for separating liquid
    AT231473B|1964-01-27|Separator for separating a mixture of liquids and solids
    DE1442485C|1971-05-13|Device for separating liquids of different densities
    DE10162710B4|2013-01-17|Method and device for the care and cleaning of a working medium
    DE2457818A1|1975-06-19|METHOD AND DEVICE FOR THE CONTINUOUS SEPARATION OF SUSPENSION LIQUID FROM A FIBER SUSPENSION
    DE102009018934B4|2013-01-03|Pressure filter device and method for filtration
    同族专利:
    公开号 | 公开日
    RU2014140464A|2016-04-27|
    US9833732B2|2017-12-05|
    BR102014025117A2|2015-09-29|
    RU2671355C2|2018-10-30|
    RU2014140464A3|2018-03-23|
    CN104548716B|2018-08-31|
    AU2014233609A1|2015-04-30|
    US20150101974A1|2015-04-16|
    AU2014233609B2|2018-02-22|
    ZA201406938B|2015-10-28|
    AT514597B1|2015-02-15|
    CN104548716A|2015-04-29|
    EP2859930A3|2015-06-10|
    EP2859930A2|2015-04-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    GB1210971A|1967-03-10|1970-11-04|Purac Ab|Improvements in and relating to filter units for liquid suspensions of fibrous and similar materials|
    DE3614668A1|1985-05-02|1986-12-18|Aktiebolaget Hedemora Verkstäder, Hedemora|FILTER FOR CONTINUOUSLY FILTERING A SUSPENSION UNDER PRESSURE|
    DE69005947T2|1989-03-13|1994-04-28|Caustec Ab Goeteborg|FILTERS FOR CONTINUOUS FILTRATION.|
    EP0596857A1|1992-11-06|1994-05-11|Andritz-Patentverwaltungs-Gesellschaft m.b.H.|Process and device for separating mixtures of solids and liquids|
    DE4422503A1|1994-06-28|1996-01-04|Kloeckner Humboldt Deutz Ag|Sepn. of solids, e.g. coal particles, from fluid suspension|
    US3471026A|1966-12-09|1969-10-07|Dorr Oliver Inc|Continuous rotary disc filters|
    US3485378A|1967-02-23|1969-12-23|Dorr Oliver Inc|Rotary drum filter with interior filter panels|
    US4207190A|1978-01-03|1980-06-10|Dorr-Oliver Incorporated|Rotary vacuum disc filter|
    US5053123A|1989-04-17|1991-10-01|Ingersoll-Rand Company|Adjustable valve for varying filtrate composition from filters|
    SE501550C2|1992-11-20|1995-03-13|Kvaerner Pulp Equipment As|Suction head disposed between a filtrate channel and a drop tube at a rotating filter|
    US5503737A|1994-07-25|1996-04-02|Ingersoll-Rand Company|Air inflow restrictor for disc filters|
    AT403770B|1996-10-09|1998-05-25|Andritz Patentverwaltung|Control head for rotary filters|
    CN100553730C|2007-11-14|2009-10-28|四川大学|Planet gyration small circular cylinder continuous pressure filtration machine|
    CN101530691B|2009-03-09|2011-05-11|上海化工研究院|Liquid solid separating method for regenerating filtrate medium in filter|
    CN101829449B|2010-05-18|2012-09-19|王光华|Rotary pressure filter|CN104971540B|2015-07-09|2016-08-17|陈卡丹|Energy-conservation swimming pool water purification cartridge|
    JP2019089041A|2017-11-16|2019-06-13|三菱化工機株式会社|Filtration testing device|
    法律状态:
    2020-08-15| MM01| Lapse because of not paying annual fees|Effective date: 20191011 |
    优先权:
    申请号 | 申请日 | 专利标题
    ATA784/2013A|AT514597B1|2013-10-11|2013-10-11|Filter for continuously filtering a suspension under pressure|ATA784/2013A| AT514597B1|2013-10-11|2013-10-11|Filter for continuously filtering a suspension under pressure|
    ZA2014/06938A| ZA201406938B|2013-10-11|2014-09-23|Filter for continuous filtration of a suspension under pressure|
    AU2014233609A| AU2014233609B2|2013-10-11|2014-09-26|Filter for continuous filtration of a suspension under pressure|
    US14/509,472| US9833732B2|2013-10-11|2014-10-08|Filter for continuous filtration of a suspension under pressure|
    BR102014025117A| BR102014025117A2|2013-10-11|2014-10-08|filter for continuous filtration of a suspension under pressure|
    RU2014140464A| RU2671355C2|2013-10-11|2014-10-08|Filter for continuous filtration of suspension under pressure|
    EP14003470.3A| EP2859930A3|2013-10-11|2014-10-09|Filter for continuous filtering of a suspension under pressure|
    CN201410535138.1A| CN104548716B|2013-10-11|2014-10-11|Filter for continuously filtering suspension under stress|
    [返回顶部]