EP0412250B1 - Apparatus for dewatering, especially press belt filter - Google Patents

Apparatus for dewatering, especially press belt filter Download PDF

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Publication number
EP0412250B1
EP0412250B1 EP90109712A EP90109712A EP0412250B1 EP 0412250 B1 EP0412250 B1 EP 0412250B1 EP 90109712 A EP90109712 A EP 90109712A EP 90109712 A EP90109712 A EP 90109712A EP 0412250 B1 EP0412250 B1 EP 0412250B1
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EP
European Patent Office
Prior art keywords
dewatering
press rolls
drum
dewatering drum
press
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.)
Expired - Lifetime
Application number
EP90109712A
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German (de)
French (fr)
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EP0412250A1 (en
Inventor
Theodor Bähr
Ferenc Bilics
Hubert Polifke
Rolf Laible
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.)
JM Voith GmbH
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JM Voith GmbH
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Filing date
Publication date
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Publication of EP0412250A1 publication Critical patent/EP0412250A1/en
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Publication of EP0412250B1 publication Critical patent/EP0412250B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp

Definitions

  • the invention relates to a drainage device according to the preamble of claim 1.
  • a drainage device has become known from DE-A-21 38 072.
  • This device has already been improved in that the inlet box, which the suspension in front of the drainage drum area of feeds the dewatering drum directly around the sieving belt, has assigned an area in front of the approach point of the other sieving belt to this sieving belt, has given up the suspension to the first-mentioned sieving belt and has formed an inlet gap directly in front of the dewatering drum between the first and the second sieving belt by suitable deflection of the second sieving belt Has.
  • the object of the invention is to design such a device so that a higher throughput can be achieved and, above all, the input material density can be reduced by higher effectiveness of the initial drainage process.
  • the amount of suspension flowing into the inlet gap determines the throughput of the dewatering device to a large extent, if one disregards the regulation or setting of a number of revolutions of the dewatering drum or a circulation speed of the sieve belts.
  • the measure according to the invention ensures that a relatively gentle increase in the pressing pressure of the sieve belts is achieved in the area of the arcuate sliding guide at the inlet gap until it receives the first, higher value on the dewatering drum 4.
  • This arcuate sliding guide is favorably guided in the area of the inlet gap over a 15 ° circular sector ⁇ .
  • the belt pressure filter has two screen belts 1 and 2, which partly wrap around both the drainage drum 4, which is perforated on its circumference, and the downstream press rolls 9-13.
  • the radially inner sieve belt 2 is still guided over deflection rollers 26 and 27 and the radially outer sieve belt 1 with respect to the dewatering drum around the dewatering rollers 28-31.
  • an inlet gap 6 is formed, which is directed downwards, ie radially inwards, with respect to the loop of the sieve belt 2 lying directly against the dewatering drum 4 by an arranged there arcuate sliding guide, preferably made of slidable plastic material and partially perforated with sieves.
  • the water (liquid) pressed out of the suspension in the inlet gap can flow into the receiving trough 38.
  • the suspension is fed from the inlet box 40, to which it is fed through the inlet nozzle 41, onto the sieve belt 2 which is tightly fitting on the dewatering drum 4.
  • the amount of liquid which is already flowing out here and which passes through the sieve belt 2 also reaches the collecting box 38.
  • the drainage drum 4 has a perforated circumference, a screen covering preferably being placed over a perforated cylinder.
  • the drainage drum is closed off at the side by plates 34 provided with outlet openings 35.
  • the ends of the drainage drum are each supported in a bearing 32, which are supported on the upper support beam 20.
  • press rolls 9-11 of the lower row and 12 and 13 of the upper row two adjacent press rolls of the two rows each form a press nip with one another.
  • the press rolls 12 and 13 of the upper row are supported by hydraulic piston-cylinder units 14 and 15 against the upper support beam 20.
  • the central axes of the pressing elements 14 and 15 are inclined at an angle of approximately 70 ° and counter to the direction of the wire running to the connecting plane of the lower row of press rolls 9-11. This causes them to press the upper press rolls 12 and 13 against the lower press rolls 9-11 so that two press nips are formed on the upper press rolls.
  • the squeezed water (liquid) is collected in the lower collecting trough 36 and discharged via the discharge nozzle 37.
  • the entire device is supported on a base plate 48 via supports 45 and 46 which engage the lower cross support beam 21.
  • the upper cross support beam 20 is also supported on the lower cross support beam 21 via lateral support columns 22 and 23.
  • the deflection rollers as indicated in the case of the deflection roller 25, 33, are each held via similar bearings, with the exception here of the deflection roller 28, which is supported by a pivot lever 55 and a hydraulic pressure element 52 for the purpose of producing the fabric tension.
  • the radius of curvature K of the arcuate sliding guide 3 is at least three times the outer radius of the dewatering drum 4, and the outer radius R of the dewatering drum 4 is at least twice the smallest outer radius r of the press rolls 9-13.
  • This belt pressure filter also has the advantage that a relatively low starting material density can be used due to the relatively gentle, technologically very favorable dewatering process in the area of the inlet gap 6. Nevertheless, due to the good drainage effect, almost the same starting material density is obtained as with previous drainage systems of this type. Depending on the type of material, the input material density can be between 2.5 and 2.9%.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Filtration Of Liquid (AREA)
  • Paper (AREA)
  • Filtering Materials (AREA)
  • Confectionery (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Press Drives And Press Lines (AREA)

Abstract

The press-belt filter has an arcuate entry gap 6 in the region of an arcuate sliding guide 3 which is formed by a perforated plastic shell. This plastic has very favourable sliding properties. The arcuate entry part corresponds approximately to a circle sector of 15 DEG . The frictional stresses along the screening belt running on the sliding guide are consequently not very high. <IMAGE>

Description

Die Erfindung betrifft eine Entwässerungseinrichtung entsprechend dem Oberbegriff des Patentanspruchs 1. Eine solche Einrichtung ist bekanntgeworden durch die DE-A-21 38 072. Diese Einrichtung ist schon dadurch verbessert worden, daß man den Einlaufkasten, der die Suspension dem vor der Entwässerungstrommel gelegenen Bereich des die Entwässerungstrommel unmittelbar teilweise umschlingenden Siebbandes zuführt, einem Bereich vor der Annäherungsstelle des anderen Siebbandes an dieses Siebband zugeordnet hat, die Suspension dem erstgenannten Siebband aufgegeben hat und zwischen dem ersten und dem zweiten Siebband durch geeignete Umlenkung des zweiten Siebbandes einen Einlaufspalt unmittelbar vor der Entwässerungstrommel gebildet hat. Dadurch konnte bereits in dem Bereich der Aufgabevorrichtung durch das erstgenannte Siebband hindurchtretende Flüssigkeit aufgefangen und somit bereits in einem frühen Stadium der Suspension entzogen werden.The invention relates to a drainage device according to the preamble of claim 1. Such a device has become known from DE-A-21 38 072. This device has already been improved in that the inlet box, which the suspension in front of the drainage drum area of feeds the dewatering drum directly around the sieving belt, has assigned an area in front of the approach point of the other sieving belt to this sieving belt, has given up the suspension to the first-mentioned sieving belt and has formed an inlet gap directly in front of the dewatering drum between the first and the second sieving belt by suitable deflection of the second sieving belt Has. As a result, it was possible to collect liquid passing through the first-mentioned sieve belt in the area of the feed device and thus to withdraw the suspension at an early stage.

Die Aufgabe der Erfindung ist es, eine solche Einrichtung so auszubilden, daß ein größerer Durchsatz erzielt und vor allem die Eingangsstoffdichte durch höhere Effektivität des Anfangsentwässerungsverlaufs herabsetzt werden kann.The object of the invention is to design such a device so that a higher throughput can be achieved and, above all, the input material density can be reduced by higher effectiveness of the initial drainage process.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des kennzeichnenden Teil des Patentanspruchs 1 gelöst. Eine besonders günstige Weiterbildung der Erfindung ist mit den Merkmalen des Anspruchs 2 angegeben.This object is achieved by the features of the characterizing part of patent claim 1. A particularly favorable development of the invention is specified with the features of claim 2.

Es ist ja so, daß die in den Einlaufspalt einströmende Suspensionsmenge den Durchsatz der Entwässerungseinrichtung im starkem Maße bestimmt, wenn man einmal von der Regulierung bzw. Einstellung einer Umdrehungszahl der Entwässerungstrommel bzw. einer Umlaufgeschwindigkeit der Siebbänder absieht. Durch die erfindungsgemäße Maßnahme wird erreicht, daß man in dem Bereich der bogenförmigen Gleitführung am Einlaufspalt eine relativ sanfte Steigerung des Preßdruckes der Siebbänder erzielt, bis dieser an der Entwässerungstrommel 4 den ersten, höheren Wert erhält. Dadurch wird die Flüssigkeit sehr gut ausgepreßt und eine Art Fließ gebildet, wohingegen sonst es leicht vorkommen konnte, daß die Suspension seitlich aus dem Einlaufspalt herausspritzte. Günstig wird diese bogenförmige Gleitführung im Bereich des Einlaufspaltes über einem 15° Kreissektor α geführt.It is the case that the amount of suspension flowing into the inlet gap determines the throughput of the dewatering device to a large extent, if one disregards the regulation or setting of a number of revolutions of the dewatering drum or a circulation speed of the sieve belts. The measure according to the invention ensures that a relatively gentle increase in the pressing pressure of the sieve belts is achieved in the area of the arcuate sliding guide at the inlet gap until it receives the first, higher value on the dewatering drum 4. As a result, the liquid is squeezed out very well and a kind of flow is formed, whereas otherwise it could easily happen that the suspension sprayed out of the side of the inlet gap. This arcuate sliding guide is favorably guided in the area of the inlet gap over a 15 ° circular sector α.

Nachfolgend wird die Erfindung anhand eines in der Zeichnung dargestellten Ausführungsbeispiels erläutert, wobei die Figur einen prinzipmäßigen Querschnitt durch das Banddruckfilter darstellt.The invention is explained below using an exemplary embodiment shown in the drawing, the figure representing a basic cross section through the belt pressure filter.

Das Banddruckfilter weist zwei Siebbänder 1 und 2 auf, die sowohl die an ihrem Umfang gelochte Entwässerungstrommel 4 als auch die nachgeschalteten Preßwalzen 9-13 gemeinsam teilweise umschlingen. Das radial innere Siebband 2 ist noch über Umlenkrollen 26 und 27 und das im Bezug auf die Entwässerungstrommel radial äußere Siebband 1 um die Entwässerungsrollen 28-31 geführt. Im Bereich der Entwässerungstrommel 4 ist ein Einlaufspalt 6 gebildet, der nach unten hin, d.h. nach radial innen in bezug auf die Schleife des unmittelbar an der Entwässerungstrommel 4 anliegenden Siebbandes 2 durch eine dort angeordnete bogenförmige Gleitführung, vorzugsweise aus gleitfähigem Kunststoffmaterial und teilweise siebmäßig gelocht, gebildet ist. Dadurch kann das in dem Einlaufspalt aus der Suspension herausgepreßte Wasser (Flüssigkeit) in den Aufnahmetrog 38 abfließen. Die Suspension wird vom Einlaufkasten 40, dem sie durch den Einlaufstutzen 41 zugeführt wird, auf das an der Entwässerungstrommel 4 eng anliegende Siebband 2 aufgegeben. Die hier bereits abfließende Flüssigkeitmenge, die durch das Siebband 2 hindurchtritt, gelangt ebenfalls in den Auffangkasten 38.The belt pressure filter has two screen belts 1 and 2, which partly wrap around both the drainage drum 4, which is perforated on its circumference, and the downstream press rolls 9-13. The radially inner sieve belt 2 is still guided over deflection rollers 26 and 27 and the radially outer sieve belt 1 with respect to the dewatering drum around the dewatering rollers 28-31. In the area of the dewatering drum 4, an inlet gap 6 is formed, which is directed downwards, ie radially inwards, with respect to the loop of the sieve belt 2 lying directly against the dewatering drum 4 by an arranged there arcuate sliding guide, preferably made of slidable plastic material and partially perforated with sieves. As a result, the water (liquid) pressed out of the suspension in the inlet gap can flow into the receiving trough 38. The suspension is fed from the inlet box 40, to which it is fed through the inlet nozzle 41, onto the sieve belt 2 which is tightly fitting on the dewatering drum 4. The amount of liquid which is already flowing out here and which passes through the sieve belt 2 also reaches the collecting box 38.

Die Entwässerungstrommel 4 hat einen gelochten Umfang, wobei vorzugsweise eine Siebbespannung über einen gelochten Zylinder gelegt ist. Seitlich ist die Entwässerungstrommel durch mit Austriffsöffnungen 35 versehene Platten 34 abgeschlossen. Die Entwässerungstrommel ist an ihren Enden je in einem Lager 32 gelagert, die sich an dem oberen Stützträger 20 abstützen.The drainage drum 4 has a perforated circumference, a screen covering preferably being placed over a perforated cylinder. The drainage drum is closed off at the side by plates 34 provided with outlet openings 35. The ends of the drainage drum are each supported in a bearing 32, which are supported on the upper support beam 20.

Von den nachgeschalteten Preßwalzen 9-11 der unteren Reihe und 12 und 13 der oberen Reihe bilden jeweils 2 benachbarte Preßwalzen der beiden Reihen einen Preßspalt miteinander. Dabei sind die Preßwalzen 12 und 13 der oberen Reihe durch hydraulische Kolben-Zylinder-Einheiten 14 und 15 gegen den oberen Stützträger 20 abgestützt. Die Mittelachsen der Anpreßelemente 14 und 15 sind mit einem Winkel von etwa 70° und gegen die Sieblaufrichtung zur Verbindungsebene der unteren Reihe von Preßwalzen 9-11 geneigt. Dies führt dazu, daß sie die oberen Preßwalzen 12 und 13 so gegen die unteren Preßwalzen 9-11 drücken, daß jeweils an den oberen Preßwalzen je zwei Preßspalte gebildet werden.Of the downstream press rolls 9-11 of the lower row and 12 and 13 of the upper row, two adjacent press rolls of the two rows each form a press nip with one another. The press rolls 12 and 13 of the upper row are supported by hydraulic piston-cylinder units 14 and 15 against the upper support beam 20. The central axes of the pressing elements 14 and 15 are inclined at an angle of approximately 70 ° and counter to the direction of the wire running to the connecting plane of the lower row of press rolls 9-11. This causes them to press the upper press rolls 12 and 13 against the lower press rolls 9-11 so that two press nips are formed on the upper press rolls.

Es werden steigende Preßdrücke in der Reihenfolge der Preßspalte zwischen 100 und 600 N/cm angewendet.Rising pressures in the order of the press nips between 100 and 600 N / cm are used.

Das ausgepreßte Wasser (Flüssigkeit) wird in dem unteren Sammeltrog 36 aufgefangen und über den Abführstutzen 37 abgeleitet. Über Stützen 45 und 46, die an dem unteren Quer-Stützträger 21 angreifen, stützt sich die gesamte Einrichtung an einer Bodenplatte 48 ab. Dabei ist noch der obere Quer-Stützträger 20 über seitliche Stützsäulen 22 bzw. 23 auf dem unteren Quer-Stützträger 21 gelagert. Die Umlenkrollen sind, wie im Fall der Umlenkrolle 25,33 angedeutet, über ähnliche Lager jeweils gehalten, mit Ausnahme hier der Umlenkrolle 28, die über einen Schwenkhebel 55 und ein hydraulisches Druckelement 52 zwecks Herstellung der Siebspannung abgestützt ist. Ähnliches gilt für die obere Umlenkrolle 27 des anderen Siebbandes 2, wofür der Hebel 53 und das pneumatische Druckelement 54 vorgesehen sind. Diese pneumatischen Druckelemente greifen wiederum an Hebeln 53 bzw. 56 an.The squeezed water (liquid) is collected in the lower collecting trough 36 and discharged via the discharge nozzle 37. The entire device is supported on a base plate 48 via supports 45 and 46 which engage the lower cross support beam 21. In this case, the upper cross support beam 20 is also supported on the lower cross support beam 21 via lateral support columns 22 and 23. The deflection rollers, as indicated in the case of the deflection roller 25, 33, are each held via similar bearings, with the exception here of the deflection roller 28, which is supported by a pivot lever 55 and a hydraulic pressure element 52 for the purpose of producing the fabric tension. The same applies to the upper deflection roller 27 of the other sieve belt 2, for which the lever 53 and the pneumatic pressure element 54 are provided. These pneumatic pressure elements in turn engage levers 53 and 56, respectively.

Der Krümmungsradius K der bogenförmigen Gleitführung 3 beträgt mindestens das Dreifache des Außenradius der Entwässerungstrommel 4, und der Außenradius R der Entwässerungstrommel 4 mindestens das Zweifache des kleinsten Außenradius r der Preßwalzen 9-13.The radius of curvature K of the arcuate sliding guide 3 is at least three times the outer radius of the dewatering drum 4, and the outer radius R of the dewatering drum 4 is at least twice the smallest outer radius r of the press rolls 9-13.

Man hat bei diesem Banddruckfilter auch noch den Vorteil, daß durch den relativ sanften, technologisch sehr günstigen Entwässerungsvorgang im Bereich des Einlaufspaltes 6 man eine relativ niedrige Anfangsstoffdichte benutzen kann. Trotzdem erhält man wegen der guten Entwässerungswirkung nahezu die gleiche Ausgangsstoffdichte wie bei bisherigen Entwässerungseinrichtungen dieser Art. Die Eingangsstoffdichten können hier je nach Stoffart zwischen 2,5 und 2,9 % betragen.This belt pressure filter also has the advantage that a relatively low starting material density can be used due to the relatively gentle, technologically very favorable dewatering process in the area of the inlet gap 6. Nevertheless, due to the good drainage effect, almost the same starting material density is obtained as with previous drainage systems of this type. Depending on the type of material, the input material density can be between 2.5 and 2.9%.

Claims (6)

  1. Apparatus for dewatering, in particular for thickening fibrous suspensions, having a perforated dewatering drum (4) as the first dewatering stage, and also having press (9 - 13) connected after the dewatering drum and parallel to one another and to the dewatering drum and two wire belts (1, 2), which are partly wound around both the dewatering drum and also the press rolls, between the press rolls corresponding to their number (n) a corresponding number (n-1) of press nips being formed,
    characterised in that an inlet nip (6) is formed by a curved slideway (3) for the wire belt (2) positioned radially inwardly on the dewatering drum (4), the radius of curvature (k) of the curved slideway (3) being at least three times the external radius (R) of the dewatering drum (4), and the external radius (R) of the dewatering drum (4) being at least two times the smallest external radius (r) of the press rolls (9 - 13).
  2. Apparatus for dewatering according to Claim 1,
    characterised in that the number of press rolls (9 - 13) is at least four and they are disposed substantially in a row next to one another both radially inwardly and also radially outwardly with respect to the loop of the radially inner wire belt (2), the press rolls (12, 13) of at least one of the rows being provided with pressure members (14, 15) having central longitudinal axes inclined at an acute angle, in particular roughly 70°, against the wire direction to the connecting plane of the central longitudinal axes of the other row of press rolls (9 - 11).
  3. Apparatus for dewatering according to Claim 1 or 2,
    characterised in that the pressure members (14, 15) are hydraulic or pneumatic cylinder-piston units.
  4. Apparatus for dewatering according to one of Claims 1 - 3,
    characterised in that the pressure members (14, 15) are disposed radially inwardly with respect to the loop of the wire belt (2) positioned radially inwardly with respect to the dewatering drum (4).
  5. Apparatus for dewatering according to one of Claims 1 - 4,
    characterised in that the rows of press rolls (9 - 11 and 12, 13) are disposed substantially horizontally or with a maximum deviation of 25° from the horizontal plane.
  6. Apparatus for dewatering according to one of Claims 1 - 5,
    characterised in that the radius of curvature (k) of the curved slideway (3) is roughly four times the radius (R) of the dewatering drum (4).
EP90109712A 1989-08-10 1990-05-22 Apparatus for dewatering, especially press belt filter Expired - Lifetime EP0412250B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3926440A DE3926440A1 (en) 1989-08-10 1989-08-10 DRAINAGE DEVICE, IN PARTICULAR BAND PRESSURE FILTERS
DE3926440 1989-08-10

Publications (2)

Publication Number Publication Date
EP0412250A1 EP0412250A1 (en) 1991-02-13
EP0412250B1 true EP0412250B1 (en) 1993-08-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP90109712A Expired - Lifetime EP0412250B1 (en) 1989-08-10 1990-05-22 Apparatus for dewatering, especially press belt filter

Country Status (10)

Country Link
EP (1) EP0412250B1 (en)
JP (1) JPH03130493A (en)
KR (1) KR910004895A (en)
AT (1) ATE93559T1 (en)
BR (1) BR9004049A (en)
CA (1) CA2022779A1 (en)
DE (1) DE3926440A1 (en)
DK (1) DK0412250T3 (en)
ES (1) ES2045642T3 (en)
FI (1) FI903948A0 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT402370B (en) * 1991-06-13 1997-04-25 Andritz Patentverwaltung DOUBLE SCREEN DRAINAGE DEVICE
AT401069B (en) * 1993-06-23 1996-06-25 Leripa Kunststoff Gmbh & Co Kg Edge seal for dewatering elements
US20050027006A1 (en) 2003-07-28 2005-02-03 Reuben Matalon Methods and materials for treating conditions associated with metabolic disorders
WO2013077169A1 (en) 2011-11-25 2013-05-30 オリンパスメディカルシステムズ株式会社 Endoscope

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH331868A (en) * 1954-09-18 1958-08-15 Voith Gmbh J M Device for thickening fiber suspensions
GB1288277A (en) * 1969-02-03 1972-09-06
DE2138072B2 (en) * 1971-07-30 1973-10-31 J.M. Voith Gmbh, 7920 Heidenheim Band pressure filter
EP0197731A3 (en) * 1985-03-29 1988-07-06 The Black Clawson Company Apparatus and method for thickening pulp and paper stock

Also Published As

Publication number Publication date
ATE93559T1 (en) 1993-09-15
DE3926440A1 (en) 1991-02-14
JPH03130493A (en) 1991-06-04
DK0412250T3 (en) 1993-11-01
EP0412250A1 (en) 1991-02-13
CA2022779A1 (en) 1991-02-11
ES2045642T3 (en) 1994-01-16
KR910004895A (en) 1991-03-29
BR9004049A (en) 1991-09-03
FI903948A0 (en) 1990-08-09

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