EP0685325A2 - Dispositif pour separer la partie liquide de la partie solide dans des systèmes à deux phases - Google Patents

Dispositif pour separer la partie liquide de la partie solide dans des systèmes à deux phases Download PDF

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Publication number
EP0685325A2
EP0685325A2 EP95106675A EP95106675A EP0685325A2 EP 0685325 A2 EP0685325 A2 EP 0685325A2 EP 95106675 A EP95106675 A EP 95106675A EP 95106675 A EP95106675 A EP 95106675A EP 0685325 A2 EP0685325 A2 EP 0685325A2
Authority
EP
European Patent Office
Prior art keywords
filter
screw
filter medium
section
filter elements
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.)
Granted
Application number
EP95106675A
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German (de)
English (en)
Other versions
EP0685325B1 (fr
EP0685325A3 (fr
Inventor
Dietrich Dr. Ing. Schlegel
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE29522135U priority Critical patent/DE29522135U1/de
Publication of EP0685325A2 publication Critical patent/EP0685325A2/fr
Publication of EP0685325A3 publication Critical patent/EP0685325A3/fr
Application granted granted Critical
Publication of EP0685325B1 publication Critical patent/EP0685325B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B30B9/125—Control arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/26—Permeable casings or strainers

Definitions

  • the invention relates to a device for separating the liquid fraction from the solid fraction of finely disperse mineral sludges, in particular a ceramic slurry, with a screw and with cylindrical filter means surrounding the screw with radial spacing and arranged along the screw, which with the screw limit a conveying channel for the slip , which is fed via a material feed at one end of the filter screw press and, after being conveyed through the channels of the rotating screw at the other end, is discharged as a solid discharge via a mouthpiece, the liquid fraction flowing through the filter medium being discharged via a filtrate discharge.
  • a device according to the preamble of claim 1 is already known (EP-B 0 138 920), in which the filter means surrounding the screw are arranged in a housing.
  • the filter media surfaces facing the screw of the filter media accommodated in the housing are covered with an abrasion-resistant protective grille for protection against abrasion.
  • a stationary filter cake forms in the mesh of this grid, which represents a significant flow resistance for the filtrate drain.
  • This resistance becomes smaller, the smaller the thickness of the grating and the smaller the area portion of the filter medium surface covered by the grating bars.
  • the thickness of the grid and the proportion of the area covered by the grid cannot be reduced arbitrarily, so that there are limits to a reduction in the resistance for the filtrate outflow.
  • the use of the protective grid also results a structural effort of such a known filter screw press.
  • the object of the invention is to eliminate the disadvantage of the prior art, in particular to provide a device for separating the liquid portion from the solid portion, which is structurally simple and does not require additional protective grids for the filter medium.
  • the invention is based on the knowledge that from the beginning to the middle of the screw channel the two-phase system is still liquid to soft plastic, so that a filter cake resting on the filter medium is formed in the gap between the outside diameter of the screw and the inside diameter of the filter cylinder, the solids content of which is higher than that of the medium in the screw channel, so that the filter media are protected against friction due to the resting filter cake.
  • the use of filter media that do not have to be designed for high abrasion resistance is sufficient in this section, or additional protective measures of the filter media by connecting protective grids and the like can be omitted.
  • the invention takes this into account by the two-stage structure of the device, filter media with lower abrasion resistance being able to be used in the first filter medium section, whereas filter media which are characterized by a higher abrasion resistance are used in the second filter medium section adjoining it.
  • Porous silicon carbide or silicon nitride cylinders are particularly suitable for this.
  • the filter means are accommodated in filter elements with a limited axial length, which are advantageously constructed identically. This offers the possibility of assembling the filter elements in a modular manner, by arranging filter elements of the first filter medium section and filter elements of the second filter medium section next to one another along the screw axis. The filter elements are sealed against each other by conventional seals.
  • the filter media of the first filter section are distinguished by the finest pores close to the filter media surface, the pore system expanding into the filter media. As a result, fine particles are largely retained on the surface of the filter medium, whereas fine particles entering the pore system can easily pass through the filter medium. This largely prevents blockages.
  • a stationary filter cake layer adheres firmly to the surface of the filter medium in the first filter section in such a way that abrasion and primary clogging are kept away from the filter medium.
  • zone 2 i.e. the second filter section
  • the two-phase system is already concentrated to a disperse plastic material.
  • the solid particles are apparently so firmly fixed in a solid framework that the finest solid particles do not penetrate into the filter medium even if the protective stationary cake layer no longer exists here.
  • the protective grids on the filter media originally provided according to EP-B 0 138 920 can be dispensed with, which would greatly increase the resistance to the outflow of the filtrate and would thereby reduce the performance very much.
  • the construction is considerably cheaper. Relatively inexpensive filter elements that are sensitive to abrasion can be used for the first filter section, whereas only abrasion-resistant abrasion elements are required in the second filter section.
  • Fine-pored sintered sieve mesh and porous silicon carbide are examples of the filter media required in the respective sections. Of course, other suitable filter media can also be used.
  • the division according to the invention of the filtering screw cylinder into a number of self-supporting elements with a correspondingly smaller axial extension of the filter elements, in which the filter media are well fastened in undivided steel cylinders, is particularly advantageous, as a result of which the very high forces that occur during processing can be well absorbed.
  • a closed housing, which accommodates the filter elements, is dispensable, rather a frame that defines the position of the filter elements and absorbs the torques that act on the individual filter elements is sufficient.
  • the filter elements are expediently designed to be self-supporting, the filter means either being welded into a solid steel cylinder or a steel cylinder being shrunk over the filter means, which is particularly the case when ceramic filter media are used.
  • the filter elements are only fixed by means of tie rods and otherwise secured against rotation on the outside by a frame. This results in an overall very simple, easy-to-assemble construction of a filter screw press.
  • a special rinsing process is also essential to clean both the screw channel and the filter elements after longer operating times.
  • the snail channels through tap water are in a first work cycle rinsed, whereas in a second working cycle the filter elements are rinsed with changing flow direction, preferably individually with rinsing water under pressure. It is also possible to rinse the pore system of the filter elements with rinsing water intermittently against the flow direction of the filtrate without rinsing the screw channels beforehand.
  • the device according to FIG. 1 is formed by a filter screw press which has a conventional screw 1, which is arranged within a housing formed by filter elements 2 and 3 arranged next to one another and is rotatably mounted at 4.
  • the screw 1 which is set in rotation by a drive (not shown), serves to convey ceramic slip which is transported through the screw channel formed between the screw 1 and the filter elements 2 and 3 for the purpose of separating the liquid portion from the solid portion.
  • the slip is fed to the screw channel 5 via the material feed 6 at one end of the filter screw press and leaves the press via the mouthpiece 7 at the other end.
  • a discharge opening is shown which serves as a bypass and is closer below is explained.
  • the filter elements 2 of the first filter medium section extend over at least half of the part of the screw which is effective for the slurry conveyance. In the illustrated embodiment, four filter elements 2 are shown, to which three filter elements of the second filter medium section are connected.
  • the cylindrical filter elements 2 and 3 arranged alongside one another along the screw axis are sealed next to one another by seals 9 of conventional design.
  • the filter elements 2 and 3 are self-supporting, so that an additional housing for the filter screw press is not required.
  • the filter screw press comprises a flushing water supply line 10, via which, via a water pump 11 and a control valve 12, flushing water can be supplied to the individual filter elements with the interposition of valves V 1 to V n .
  • a further rinsing water circuit is formed by the water line 13 and the valve 14, which opens into the filter screw press at 15, and by the rinsing water line 15a and the control valve 16, the line 15a at the mouth end at 16a discharging the rinsing water from the screw channel.
  • a sedimentation basin for the rinsing water is identified by 17, a line 18 also opening into the basin 17, which leads away from the bypass 8.
  • tie rods are shown schematically, which serve to fix the filter elements 2 and 3.
  • Figures 2 to 5 show the structure of the filter elements 2 of the first filter medium section.
  • 2 shows the filter medium 21 of the first filter medium section, which is preferably formed from a plurality of layers of screen fabrics arranged one above the other, which are sintered together. This results in the porous system of the filter means 21, which is otherwise circular cylindrical.
  • the filter medium can also be formed from a porous sintered metal cylinder, in particular sintered steel.
  • the porous cylindrical filter media 22 of the second filter media section are formed from ceramic material, in particular silicon carbide or silicon nitride.
  • the sintered sieve fabrics or sintered steel cylinders for the first and the silicon carbide or silicon nitride cylinders for the second filter medium section are each received in a solid steel cylinder 23a or 23b, which is shown in FIGS. 3 and 7.
  • channels 24 are arranged in the interior of the steel cylinder 23 at a distance of approximately 20 mm in the circumferential direction, which are connected to one another by one or more axially extending channels 25, which conduct the filtrate to outlet bores 26 in the steel cylinder 23a.
  • circumferential channels 24 are also provided in the steel cylinder 23b for receiving the filter medium 22 of the second filter medium section and are connected by longitudinal channels 25 in order to discharge the filtrate via the outlet bore 26.
  • the sintered sieve fabrics or sintered steel cylinders are welded into the steel cylinder 23a, as can be seen from FIG. 5.
  • the silicon carbide or silicon nitride cylinders according to FIG. 6 are ground to the exact extent to form the filter element, so that the steel cylinder 23b can be thermally shrunk on.
  • the composite filter element is shown in FIG. 9.
  • the tolerances of the dimensions are to be selected such that after the steel cylinder has cooled down and at a filtration pressure of 120 bar in the screw channel, the cylindrical filter medium (silicon carbide or silicon nitride) is on average free of stress in the circumferential direction. If the pressure in the screw channel or in Filter element assumes the value zero, the cylindrical filter medium gets circumferentially under high pressure through the shrunk-on steel jacket.
  • the wall thickness of the cylindrical filter medium is chosen so that the silicon carbide or silicon nitride material is not overstressed.
  • the filter elements 2 and 3 are self-supporting and do not need to be supported from the outside by a special housing. They are only arranged on a corresponding frame, which is identified by 27 in FIGS. 4 and 8.
  • This frame 27 has a recess 28 in which an extension of the steel cylinder engages, as a result of which the frame 27 absorbs the torque applied to the surface of the filter medium by the rotating screw on the inside.
  • the filter elements have a limited axial length, the length of the filter elements in the preferred embodiment being in the range from 100 to 200 mm.
  • the division of the filter medium into individual filter elements not only results in a modular system, but the filter media made of screen mesh and sintered steel can also be welded to the surrounding steel jackets. This also ensures problem-free thermal shrinking of the steel jackets onto the filter media made of silicon carbide and silicon nitride. Even with the targeted ones described below This construction of the screw cylinder from individual filter elements 2 and 3 has proven itself in sections flushing the filter elements.
  • the two-phase system in the screw channel is still liquid to soft plastic.
  • the filter elements 2 are arranged in this area.
  • the screw is not yet effective (slightly falling pressure in this zone).
  • a filter cake resting on the filter cylinder is formed in the gap between the outer diameter of the screw and the inner diameter of the filter cylinder and has a significantly higher solids content than the medium in the screw channel. This filter cake also has a significantly higher mechanical strength than the material in the screw channel.
  • This resting filter cake layer is very important in the first section, since it keeps the friction away from the filter medium.
  • the filter media are made from sintered screen fabrics or sintered steel in known pore structures, the finest pores being located close to the filter media surface where the filter cake is formed. From there, the pore system expands into the respective filter medium. Fine particles are largely retained on the surface of the filter medium. The finest particles that penetrate the filter medium are very likely to completely pass through the widening channels of the filter medium and come off with the filtrate. This significantly reduces the possibility of constipation.
  • the solids concentration in the screw channel has risen to over 60 percent by weight to such an extent that a clear distinction between the medium in the screw channel and the filter cake layer on the filter medium is no longer possible.
  • the snail is clearly effective. Dewatering takes place here essentially by compression of the disperse plastic medium in the screw channel, the solid particles already touching one another.
  • a filter medium made of very abrasion-resistant silicon carbide or silicon nitride must be used, although a protective grille is not required. Due to the very rough surface structure of the silicon carbide, wall sliding is sometimes prevented, but wall sliding processes can no longer be completely excluded at the highest solid concentrations.
  • the filtrate flow gradually decreases, which is due to clogging processes.
  • the fine pores of the filter medium and especially the stationary cake layer on the filter medium are gradually added over a longer period of operation by the finest solid particles also present in the screw channel in the two-phase system, so that the flow resistance for the filtrate flow increases.
  • this blockage can be reversed by rinsing. The rinsing takes place in two steps, namely at the end of a long stationary operation of the filter screw press.
  • the mouthpiece 7 or the bypass 8 for the outflow of the plastic material at the mouth end of the screw channel is opened in order to greatly reduce the flow resistance for the outflow of the plastic material from the screw channel.
  • the screw continues to rotate and the slip flow via the material feed 6 is also maintained.
  • the rotating screw is thus capable of largely transporting the plastic material out of the screw channel through its conveying action, which takes place until slip slips through from the material feed 6 to the outlet at the mouthpiece 7 or bypass 8.
  • the slip supply 6 is shut off and the water supply tap 14 is opened so that water is fed into the filter screw press.
  • the water now flows through the screw channels and now, instead of slip, leaves the housing of the filter screw press via the mouthpiece 7 or the bypass 8. This effectively rinses the screw channel, which is largely cleaned of slip and plastic material.
  • the rotation of the screw supports the rinsing process.
  • the rinsing process is finished when slurry and residues of plastic material have been rinsed out of the screw channel.
  • connection to the water supply network at 14 and the outflow openings 7 and 8 are closed.
  • rinse water is passed under higher pressure via automatically controlled valves 12 and 16 in alternating flow directions through the pore system of the filter medium.
  • the change of direction is controlled in a predetermined time cycle by the solenoid valves 12 and 16.
  • the Flushing water flow for the filter medium is conveyed by a piston pump 11, for example hydraulically driven.
  • the discharge pressure can then be easily controlled hydraulically (10 to 30 bar).
  • the flushing water flow would decrease after a short time in flushes with a constant flow direction, since the fine particles which clog the pore system and are first released from their positions by the flushing water flow, after a short distance, settle again at any angle of the pore system and lead to new blockages . This is avoided by a repeated reversal of the direction of the flushing water flow, which transports the fine particles out of very angled pore systems, which is especially true for filter media made of porous ceramic.
  • This rinsing process of the filter elements is interrupted a few times by rinsing the screw channel with tap water, as described above, in order to convey residues of the disperse plastic material which have still detached from the surface of the filter medium out of the screw channel.
  • a simplified flushing method also proves its worth, which can be used during the ongoing operation of the screw press without first flushing the screw channels. Flushing water is passed through the pore system of the filter elements at a higher pressure than is present in the screw channel in the opposite direction to the filtrate flow. The flushing water flow must be switched on repeatedly for a limited time interval. As soon as the rinsing water flow is switched off for the subsequent time interval, a part of the rinsing water entered in the screw channel flows back through the pore system of the filter medium in the direction of the filtrate flow due to the high pressure in the screw channel, so that there is also a rinsing with changing flow direction. Again, it makes sense to rinse the filter elements one after the other.
  • the cycle times for the rinsing processes are selected to be of different lengths in the different directions.
  • a particle in the direction of the longer cycle time statistically covers a larger distance than in the opposite direction and thus has a chance of being removed from the interior of the filter medium. With this procedure it is possible to remove the gradual clogging of the filter elements caused by the finest particles, which occurs during longer operating times.
  • the use of a plurality of filter screws in parallel with one another is proposed for this section.
  • the first filter section 29 forms a filter screw with a large diameter.
  • the second filter section 30 is formed by a plurality of filter screws with a smaller diameter working in parallel with respect to the first filter section 29.
  • four filter screws 31 working in parallel are provided.
  • the diameter of the filter screws 31 of the second filter section 30 is expediently a quarter of the diameter of the filter screw 32 of the first filter section 29.
  • the filter screws 31 feed the extrudate into a common mouthpiece 33, from which then only one strand 34 of plastic mass emerges.
  • the opening cross section of the mouthpiece 33 is controlled in a known manner so that a constant predetermined pressure prevails in front of the mouthpiece.
  • the common rotational frequency of the screws of the second filter section 30 is so matched to the rotational frequency of the screw 32 of the first section that in the transition from section 29 to section 30 the concentration is established in the two-phase system, which necessitates the change of the filter medium.
  • 35 drive units of the individual filter screws 31 are designated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Filtration Of Liquid (AREA)
  • Filtering Materials (AREA)
EP95106675A 1994-05-04 1995-05-03 Dispositif pour separer la partie liquide de la partie solide dans des systèmes à deux phases Expired - Lifetime EP0685325B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE29522135U DE29522135U1 (de) 1994-05-04 1995-05-03 Vorrichtung zum Trennen des Flüssiganteils vom Feststoffanteil von Zweiphasensystemen

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4415773 1994-05-04
DE4415773 1994-05-04
US08/516,778 US5665232A (en) 1994-05-04 1995-08-18 Apparatus for separating off the liquid portion from the solids portion of two-phase systems

Publications (3)

Publication Number Publication Date
EP0685325A2 true EP0685325A2 (fr) 1995-12-06
EP0685325A3 EP0685325A3 (fr) 1996-01-24
EP0685325B1 EP0685325B1 (fr) 1999-09-01

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EP95106675A Expired - Lifetime EP0685325B1 (fr) 1994-05-04 1995-05-03 Dispositif pour separer la partie liquide de la partie solide dans des systèmes à deux phases

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US (1) US5665232A (fr)
EP (1) EP0685325B1 (fr)

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WO2021184051A1 (fr) * 2020-03-16 2021-09-23 Andritz Ag Procédé de fabrication d'un corps de tamisage et tamis

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US5848857A (en) * 1997-01-17 1998-12-15 Killworth; Timothy J. Rain gutter shield having a porous, non-woven polymeric fiber screen and method forming the rain gutter shield
US6015226A (en) * 1997-09-17 2000-01-18 Krupp Werner & Pfleiderer Gmbh Screw-type extrusion machine having tie rods loaded by a pre-stressed spring system
US6419094B1 (en) * 2000-02-09 2002-07-16 Lyco Manufacturing, Inc. Fixed sequential sprayer for a cylindrical wastewater screen
AU2003900226A0 (en) * 2003-01-21 2003-02-06 Sarah Elizabeth Chenery Lobban A filter system
US20050199267A1 (en) * 2004-03-15 2005-09-15 Oakes Kenton T. Washing system using recycled cleaning liquid
US7137759B1 (en) * 2005-12-30 2006-11-21 The Young Industries, Inc. System and method for handling bulk materials
US7686871B2 (en) * 2006-05-02 2010-03-30 Seagate Technology Llc Integrated filter assembly
DE102007062223A1 (de) * 2007-12-21 2009-06-25 Bosch Mahle Turbo Systems Gmbh & Co. Kg Ladeeinrichtung
DE202010001765U1 (de) * 2010-02-02 2011-06-09 UTS Biogastechnik GmbH, 85399 Schneckenseparator
DE202010001758U1 (de) * 2010-02-02 2011-06-09 UTS Biogastechnik GmbH, 85399 Schneckenseparator
DE202010001759U1 (de) * 2010-02-02 2011-06-09 UTS Biogastechnik GmbH, 85399 Schneckenseparator
AT12606U1 (de) * 2011-05-20 2012-08-15 Applied Chemicals Handels Gmbh Schneckenpresse
US20130213904A1 (en) * 2012-02-22 2013-08-22 M2 Renewables, Inc. Industrial separator and dewatering plant
BR112014031084B1 (pt) 2012-06-13 2023-03-14 Voith Patent Gmbh Método para remoção de líquido de um chorume
AT518983B1 (de) * 2016-12-02 2018-03-15 Andritz Ag Maschf VORRICHTUNG ZUM ENTWÄSSERN VON SCHÜTTFÄHIGEM ODER FLIEßFÄHIGEM AUFGABEGUT

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EP0383226A1 (fr) * 1989-02-13 1990-08-22 Wilfried Schraufstetter Presse à vis, notamment pour broyer des matériaux, tels que déchets organiques ou analogues
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FR596522A (fr) * 1925-04-09 1925-10-26 Presse filtrante à effet continu et matière filtrante pour l'extraction des huiles et graisses végétales
GB1056965A (en) * 1964-09-04 1967-02-01 Landsverk Ab Pulp press
JPS5551000A (en) * 1978-10-06 1980-04-14 Sanshin Seisakusho:Kk Screw press unit
WO1984003660A1 (fr) * 1983-03-25 1984-09-27 Dietrich Schlegel Installation pour separer la partie liquide de la partie solide d'une barbotine ceramique
JPS60203398A (ja) * 1984-03-26 1985-10-14 Ikegai Corp 押出機におけるシリンダ内供給素材の加水又は脱水方法及びその装置
FR2567038A1 (fr) * 1984-07-06 1986-01-10 Kadziolka Stanislas Appareils de filtration dynamique a rotor et systemes de lavage favorisant leurs nettoyages
US4705055A (en) * 1985-06-21 1987-11-10 Brown International Corporation Apparatus for automatically cleaning extrusion screens in juice finishing machines and the like
EP0288105A2 (fr) * 1987-04-24 1988-10-26 Diemme S.P.A. Dispositif de séparation en continu de particules solides ou semi-solides d'un liquide, applicable aux effluents civils ou industriels
EP0383226A1 (fr) * 1989-02-13 1990-08-22 Wilfried Schraufstetter Presse à vis, notamment pour broyer des matériaux, tels que déchets organiques ou analogues
EP0565714A1 (fr) * 1991-09-24 1993-10-20 Ishigaki Mechanical Industry Co. Ltd. Presse a vis
US5193446A (en) * 1992-02-18 1993-03-16 Fmc Corporation Automatic spray ring for use in a juice finisher

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021184051A1 (fr) * 2020-03-16 2021-09-23 Andritz Ag Procédé de fabrication d'un corps de tamisage et tamis
CN115279579A (zh) * 2020-03-16 2022-11-01 安德里茨股份有限公司 用于生产筛网主体的方法和筛网

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Publication number Publication date
EP0685325B1 (fr) 1999-09-01
US5665232A (en) 1997-09-09
EP0685325A3 (fr) 1996-01-24

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