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WO1998009708A1 - Tamis - Google Patents

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Publication number
WO1998009708A1
WO1998009708A1 PCT/FI1997/000517 FI9700517W WO9809708A1 WO 1998009708 A1 WO1998009708 A1 WO 1998009708A1 FI 9700517 W FI9700517 W FI 9700517W WO 9809708 A1 WO9809708 A1 WO 9809708A1
Authority
WO
WIPO (PCT)
Prior art keywords
sieve
container
sieving
filtrate
valve
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.)
Ceased
Application number
PCT/FI1997/000517
Other languages
English (en)
Inventor
Ari Laakko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of WO1998009708A1 publication Critical patent/WO1998009708A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6438—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element nozzles

Definitions

  • the invention relates to a sieve that can be used to separate solids from liquids.
  • the sieve is for instance suitable for sorting products according to particle size or for removal of impurities.
  • Vibrating screens or pressure screens, for instance, are currently used for the separation of solid matter.
  • Vibrating screens involve the inconveniences of being untidy, of requiring vast space compared to their capacity and of a relatively short operating life.
  • Pressure screens comprise a screen net through which the liquid to be filtered is pressed. Pressure screens are closed, and hence relatively tidy. Pressure screens, however, have the drawback of requiring cleaning of the screen net. Mechanical scrapers are usually used for the cleaning.
  • Pressure screen systems are also previously known, in which the screen net is cleaned by pressing the filtrate at intervals back through the screen net.
  • This system comprises two devices coupled in parallel, the filtrate from one of the devices being usable for the cleaning of the other one.
  • the sieve of the invention comprises two sieve surfaces separated from one another such that, whenever desired, the one sieve can be cleaned by conducting the filtrate from the other sieve back through the sieve.
  • the design is simple and compact.
  • FIG. 2 shows the sieve in the cleaning step of the other sieve surface.
  • the sieve comprises a container 1 with a rectangular cross-section, and in the container, two sieve planes 2 parallel to the long sides and extending from one wall to the other.
  • the sieve planes 2 are shorter than the container height.
  • the upper ends and the lower ends of the sieve planes 2 are connected with a horizontal wall, so that a feed chamber is formed at the upper end and a reject chamber at the lower end.
  • sieving chambers are provided, with a filtrate chamber inbetween.
  • the feed chamber is divided into two sections by means of vertical diaphragm 3 in the shape of a diagonal S, which extends from the front edge of the one sieve plane 2 to the rear edge of the other sieve plane 2.
  • a feeding pipe 5 provided with a feed valve 6 leads to each of the feed chambers.
  • a reject chamber which similarly to the feed chamber is divided into two sections by means of a diaphragm 3'.
  • a reject discharge pipe 7 provided with a valve 8 leads to the reject discharge line 9.
  • the upper end of the filtrate chamber is closed, and a filtrate discharge line 10 provided with a valve 1 1 leads from the centre of its lower end.
  • the pipe of the filtrate discharge line 10 forms part of the diaphragm 3' of the reject chamber.
  • both the feed valves 6 are open, both the reject valves 8 are closed, and the filtrate valve 1 1 is open. In this manner, the liquid will pass from both the sieving chambers through the sieve planes 2 to the common, continuous filtrate chamber, from where it is removed along line 10. Solids are separated as a reject on the outer surface of the sieve planes 2.
  • Cleaning can be performed at fixed intervals or whenever necessary. Control is preferably automatically performed.
  • container 1 were 1200x200x500 mm
  • a suitable cycle comprised for instance 120 s of filtering and 4 s of cleaning for each net, with an approx. 67% diy matter content, a 0.075 mm sieve net mesh and an output in the range of 6800 to 9900 litres per hour.
  • a conventional cross-web net can be used as a sieve net, which enables costs to be minimised as already existing nets and stretching devices are utilised. If necessary, the components are made of acid-proof materials, for instance.
  • the device does not require separate mechanical cleaning devices, nor power sources for these. This also eliminates the risk of parts of a broken (e.g. plastic) scraper being admixed with discharged products.
  • the cleaning of the sieve net is more reliable than with scrapers, thus yielding high output even with very fine sieves.
  • the sieve net will have a long operating life, since it is not exposed to vibrating or abrasive stresses.
  • a further advantage of the invention is the small space requirement relative to the output.
  • the floor area is about half of the area required for a conventional vibrating screen, while the output is threefold.
  • the device is usable in the process industries, such as the wood-processing industry, in various applications.
  • process industries such as the wood-processing industry
  • kaolin elutriating plants, coating kitchens, carbonate plants, PCC plants, lime and talc plants, latex factories and water purifying plants may be cited.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Abstract

L'invention concerne un tamis servant à séparer des solides d'un liquide dans lequel ils se trouvent. Le tamis comprend un récipient (1) et deux faces (2), qui sont contenues dans le récipient et qui divisent ledit récipient en un espace de tamisage et un espace pour filtrat. L'espace de tamisage comprend deux chambres séparées l'une de l'autre. Chacune de ces chambres est alimentée par un tuyau (5) d'alimentation, qui est muni d'une vanne (6), et dispose d'un tuyau (7) de sortie des rejets, qui est muni d'une vanne (7). Les chambres de tamisage partagent une chambre pour filtrat qui est située entre elles. Ladite chambre de filtrat dispose d'un tuyau (10) de sortie du filtrat, qui est muni d'une vanne (11). On peut nettoyer une face (2) du tamis en faisant repasser le filtrat provenant d'une face (2) à travers l'autre face (2).
PCT/FI1997/000517 1996-09-05 1997-09-04 Tamis Ceased WO1998009708A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI960458U FI2692U1 (fi) 1996-09-05 1996-09-05 Sihti
FIU960458 1996-09-05

Publications (1)

Publication Number Publication Date
WO1998009708A1 true WO1998009708A1 (fr) 1998-03-12

Family

ID=8545211

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1997/000517 Ceased WO1998009708A1 (fr) 1996-09-05 1997-09-04 Tamis

Country Status (2)

Country Link
FI (1) FI2692U1 (fr)
WO (1) WO1998009708A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102274655A (zh) * 2011-08-04 2011-12-14 天津大学 生物质基发酵醪液用塔式过滤装置
WO2015025057A1 (fr) * 2013-08-22 2015-02-26 Coyle Jonathan Appareil filtrant

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1178829B (de) * 1959-11-04 1964-10-01 Yarrow & Company Ltd Umschaltvorrichtung fuer Doppelfilter
US3679060A (en) * 1970-09-08 1972-07-25 Xomox Corp Duplex strainer construction
EP0046919A1 (fr) * 1980-08-29 1982-03-10 Agfa-Gevaert AG Procédé et installation pour la filtration en continu des liquides
EP0688593A1 (fr) * 1994-06-23 1995-12-27 Jack Moorehead Système de filtration d'écoulement liquide à contre-courant automatique rapide

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1178829B (de) * 1959-11-04 1964-10-01 Yarrow & Company Ltd Umschaltvorrichtung fuer Doppelfilter
US3679060A (en) * 1970-09-08 1972-07-25 Xomox Corp Duplex strainer construction
EP0046919A1 (fr) * 1980-08-29 1982-03-10 Agfa-Gevaert AG Procédé et installation pour la filtration en continu des liquides
EP0688593A1 (fr) * 1994-06-23 1995-12-27 Jack Moorehead Système de filtration d'écoulement liquide à contre-courant automatique rapide

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102274655A (zh) * 2011-08-04 2011-12-14 天津大学 生物质基发酵醪液用塔式过滤装置
WO2015025057A1 (fr) * 2013-08-22 2015-02-26 Coyle Jonathan Appareil filtrant
CN105682767A (zh) * 2013-08-22 2016-06-15 乔纳森·科伊尔 过滤设备
US10105623B2 (en) 2013-08-22 2018-10-23 Jonathan Coyle Filter apparatus
AU2014310474B2 (en) * 2013-08-22 2018-11-08 Claire Coyle A filter apparatus

Also Published As

Publication number Publication date
FIU960458U0 (fi) 1996-09-05
FI2692U1 (fi) 1996-12-27

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