EP1116818B1 - Device for mixing pulp suspension - Google Patents

Device for mixing pulp suspension Download PDF

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Publication number
EP1116818B1
EP1116818B1 EP00126764A EP00126764A EP1116818B1 EP 1116818 B1 EP1116818 B1 EP 1116818B1 EP 00126764 A EP00126764 A EP 00126764A EP 00126764 A EP00126764 A EP 00126764A EP 1116818 B1 EP1116818 B1 EP 1116818B1
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EP
European Patent Office
Prior art keywords
mixing
vessel
pump
mixing vessel
pipe
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
EP00126764A
Other languages
German (de)
French (fr)
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EP1116818A2 (en
EP1116818A3 (en
Inventor
Anton Gmeiner
Michael Dr. Schwarz
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.)
Voith Patent GmbH
Original Assignee
Voith Paper Patent GmbH
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 Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1116818A2 publication Critical patent/EP1116818A2/en
Publication of EP1116818A3 publication Critical patent/EP1116818A3/en
Application granted granted Critical
Publication of EP1116818B1 publication Critical patent/EP1116818B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/342—Mixing apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/56—Mixing liquids with solids by introducing solids in liquids, e.g. dispersing or dissolving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/82—Combinations of dissimilar mixers
    • B01F33/821—Combinations of dissimilar mixers with consecutive receptacles
    • B01F33/8212—Combinations of dissimilar mixers with consecutive receptacles with moving and non-moving stirring devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/28—Tanks for storing or agitating pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0018—Devices for dispensing fibres in a fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/47—Mixing of ingredients for making paper pulp, e.g. wood fibres or wood pulp
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders

Definitions

  • the invention relates to a device for mixing suspended pulp according to the preamble of claim 1.
  • the pulp suspension processed on a paper machine is often made by blending different pulps with each other and by diluting with thin pulp, e.g. White water, formed.
  • the part of the papermaking plant, which u.a. This task is commonly referred to as the Constant part.
  • a highly diluted pulp suspension of about 1 to 2% consistency is fed via the so-called mixing pump of the paper machine, wherein further processing units for the suspension may be present.
  • a method can be removed by means of which several pulp qualities can be mixed with each other or pulp with white water.
  • the thick material is directly and essentially centrally in the flow of material of the thin material, wherein a relatively high speed of the thick material is required. This admixture takes place immediately before the mixing pump. Even if the mixing effect of such a mixing pump is relatively good, temporal fluctuations in pulp quality can occur when using the known method.
  • the device according to the invention consists of a mixing vessel 5, which is designed here as an open vessel. Upstream of this mixing vessel, a mixing tube 6 is connected, which has two supply lines 8 and 9, can be added by the two different pulp suspensions 1 and 2.
  • the supply lines 8 and 9 are arranged here in the flow direction one behind the other perpendicular to the course of the mixing tube 6.
  • the so-merged material flows then pass downstream into a part of the mixing tube 6, which is provided with a static mixer 7. This is only hinted at here; static mixers are known.
  • a drivable stirrer 12 which another Liquid causes or at least prevents segregation in the mixing vessel 5.
  • the mixing vessel 5 can be kept relatively small, with particular advantage, i. its volume is much lower than that normally chosen for mixed beets.
  • the drain line 10 which opens downstream in the supply line 11 of the thin material 3 in the mixing pump 4.
  • a pump 15 may be present.
  • the thinness 3 e.g. was removed as white water from the paper machine, such a consistency is set as needed to produce the paper in the paper machine headbox.
  • the mixing pump 4 is designed. In addition to the form of input shown here, other possibilities are known.
  • FIG. 2 shows a further form of the device according to the invention, in which the mixing vessel 5 ', unlike that shown in FIG. 1, is a closed, pressurized tank. This allows the mixing system to be kept under pressure.
  • the mixing vessel 5 ' contains an overflow 15, with which the level is kept at a set value. It can also be provided with a diaphragm 16.
  • a connecting piece 13 is optionally indicated.
  • the mixed pulp suspension is added here in a curved suction line for the thin material 3 with a central nozzle tube 14 for the pulp suspensions.
  • FIG. 3 shows an example of a possible control concept for the device shown in FIG. 2.
  • the designations customary in the control technology are chosen, so that an explanation of the concept is unnecessary.
  • a total of four pulp components are combined. Their volume control is shown explicitly only for the inflow of the pulp suspension 1.
  • the inflow control of the other components can be similar, with their proportions among themselves are predetermined.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

The appts. for mixing fiber suspensions, to give a pulp for papermaking, has a mixing vessel (5) with at least one upstream mixing pipe (6) with feeds (8,9) for the fiber suspensions (1,2). It has an outflow (10) leading to a downstream mixing pump (4). The outflow (10) opens into the feed (11) of diluting material (3) to the mixing pump (4). The mixing pipe (6) has at least one static mixer (7). The mixing vessel (5) has a mechanical stirrer (12), with a drive. The vessel (5) is enclosed and can withstand an overpressure, or the vessel (5) is open. The outflow (10) from the vessel (5) has a pump. The vol. capacity of the mixing vessel (5) is set so that, for a given mixing operation, the dwell time of the suspension is 8-15 secs. The mixing pipe (6) dimensions are set, for a given mixing operation, to give an average suspension flow speed of 1-2 m/sec.

Description

Die Erfindung betrifft eine Vorrichtung zum Vermischen von suspendiertem Faserstoff gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a device for mixing suspended pulp according to the preamble of claim 1.

Die auf einer Papiermaschine verarbeitete Faserstoffsuspension wird oft durch Mischung verschiedener Faserstoffe untereinander und durch Verdünnung mit Dünnstoff, z.B. Siebwasser, gebildet. Der Teil der Papiererzeugungsanlage, dem u.a. diese Aufgabe zufällt, wird üblicherweise als Konstanter Teil bezeichnet. Meist wird eine stark verdünnte Faserstoffsuspension von ca. 1 bis 2 % Stoffdichte über die sogenannte Mischpumpe der Papiermaschine zugeführt, wobei weitere Bearbeitungsaggregate für die Suspension vorhanden sein können.The pulp suspension processed on a paper machine is often made by blending different pulps with each other and by diluting with thin pulp, e.g. White water, formed. The part of the papermaking plant, which u.a. This task is commonly referred to as the Constant part. Mostly a highly diluted pulp suspension of about 1 to 2% consistency is fed via the so-called mixing pump of the paper machine, wherein further processing units for the suspension may be present.

Es ist aus dem Stand der Technik bekannt, zum Vermischen der verschiedenen Faserstoffqualitäten, welche an dieser Stelle in wässerig suspendierter Form vorliegen, diese unmittelbar vor einer Mischpumpe zusammenzuführen. Dazu wird üblicherweise der das Verdünnungswasser führende Ansaugstutzen der Mischpumpe verwendet. Die Mischpumpe dient bekanntlich dazu, die fertige Faserstoffsuspension zum Stoffauflauf zu fördern und dabei den hierin erforderlichen, zumeist beträchtlichen Überdruck zu erzeugen. Auch wenn grundsätzlich in der Mischpumpe infolge der dort stattfindenden Verwirbelung eine Mischung der Komponenten möglich ist, hat sich doch gezeigt, dass die Mischungsqualität nicht immer ausreicht. Insbesondere kann es vorkommen, dass bei stark schwankenden Mengen oder auch beträchtlichen Unterschieden in den Stoffdichten der einzelnen Komponenten eine ungenügende Vermischung erfolgt.It is known from the prior art, for mixing the different pulp qualities which are present in aqueous suspended form at this point, to combine them immediately before a mixing pump. For this purpose, usually the dilution water leading intake manifold of the mixing pump is used. The mixing pump is known to promote the finished pulp suspension to the headbox and thereby produce the necessary here, usually considerable overpressure. Even if a mixing of the components is basically possible in the mixing pump as a result of the turbulence occurring there, it has been shown that the quality of the mixture is not always sufficient. In particular, it may happen that in strongly fluctuating amounts or significant differences in the material densities of the individual components, an insufficient mixing occurs.

Aus der DE 41 25 513 A1 ist ein Verfahren entnehmbar, mit dessen Hilfe mehrere Faserstoffqualitäten miteinander oder Faserstoff mit Siebwasser vermischt werden können. Dabei wird der Dickstoff direkt und im wesentlichen zentral in den Stoffstrom des Dünnstoffes eingeleitet, wobei eine relativ hohe Geschwindigkeit des Dickstoffes gefordert wird. Diese Zumischung erfolgt unmittelbar vor der Mischpumpe. Auch wenn die Mischwirkung einer solchen Mischpumpe relativ gut ist, können bei Verwendung des bekannten Verfahrens zeitliche Schwankungen in der Faserstoffqualität auftreten.From DE 41 25 513 A1, a method can be removed by means of which several pulp qualities can be mixed with each other or pulp with white water. The thick material is directly and essentially centrally in the flow of material of the thin material, wherein a relatively high speed of the thick material is required. This admixture takes place immediately before the mixing pump. Even if the mixing effect of such a mixing pump is relatively good, temporal fluctuations in pulp quality can occur when using the known method.

Es ist nun Aufgabe der vorliegenden Erfindung, eine Vorrichtung zu schaffen, mit deren Hilfe die Vermischung verschieden gearteter Stoffsuspensionen untereinander in möglichst effektiver Weise gewährleistet wird. Die gute Vermischung soll auch erreicht werden, wenn beträchtliche Unterschiede der Mengen und/oder Stoffdichten der einzelnen Komponenten vorliegen.It is now an object of the present invention to provide a device by means of which the mixing of different types of substance suspensions among each other is ensured in the most effective manner possible. The good mixing should also be achieved if there are considerable differences in the quantities and / or material densities of the individual components.

Diese Aufgabe wird durch die im kennzeichnenden Teil des Anspruchs 1 genannten Merkmale vollständig gelöst, wobei die Unteransprüche vorteilhafte Ausführungsformen beschreiben.This object is achieved by the features mentioned in the characterizing part of claim 1, wherein the dependent claims describe advantageous embodiments.

Die Erfindung wird erläutert an Hand von Zeichnungen. Dabei zeigen:

Fig. 1
eine vereinfachte Darstellung der erfindungsgemäßen Vorrichtung;
Fig. 2
eine Variante;
Fig. 3
ein vorteilhaftes Regelkonzept für die in Fig. 2 gezeigte Vorrichtung.
The invention will be explained with reference to drawings. Showing:
Fig. 1
a simplified representation of the device according to the invention;
Fig. 2
a variant;
Fig. 3
an advantageous control concept for the device shown in Fig. 2.

Wie die Fig. 1 an Hand eines typischen Beispieles zeigt, besteht die erfindungsgemäße Vorrichtung aus einem Mischgefäß 5, welches hier als offenes Gefäß ausgeführt ist. Stromaufwärts zu diesem Mischgefäß ist ein Mischrohr 6 angeschlossen, welches zwei Zuleitungen 8 und 9 aufweist, durch die zwei verschiedene Faserstoffsuspensionen 1 und 2 zugegeben werden können. Dabei sind die Zuleitungen 8 und 9 hier in Strömungsrichtung hintereinander senkrecht zum Verlauf des Mischrohres 6 angeordnet. Selbstverständlich können es auch mehr als zwei Zuleitungen sein, wenn die Anzahl der Stoffkomponenten entsprechend höher ist. Die so zusammengeführten Stoffströme gelangen dann stromabwärts in einen Teil des Mischrohres 6, welches mit einem statischen Mischer 7 versehen ist. Dieser ist hier nur angedeutet; statische Mischer sind bekannt. An der Stelle, an der das Mischrohr 6 in das Mischgefäß 5 einmündet, befindet sich ein antreibbarer Rührer 12, welcher eine weitere Flüssigkeit bewirkt oder zumindest die Entmischung im Mischgefäß 5 verhindert.As shown in FIG. 1 with reference to a typical example, the device according to the invention consists of a mixing vessel 5, which is designed here as an open vessel. Upstream of this mixing vessel, a mixing tube 6 is connected, which has two supply lines 8 and 9, can be added by the two different pulp suspensions 1 and 2. Here, the supply lines 8 and 9 are arranged here in the flow direction one behind the other perpendicular to the course of the mixing tube 6. Of course, there may be more than two leads, if the number of fabric components is correspondingly higher. The so-merged material flows then pass downstream into a part of the mixing tube 6, which is provided with a static mixer 7. This is only hinted at here; static mixers are known. At the point where the mixing tube 6 opens into the mixing vessel 5, there is a drivable stirrer 12, which another Liquid causes or at least prevents segregation in the mixing vessel 5.

Das Mischgefäß 5 kann mit besonderem Vorteil relativ klein gehalten sein, d.h. sein Volumen ist weit geringer als das, das normalerweise für Mischbütten gewählt wird. Am Boden des Mischgefäßes befindet sich die Ablaufleitung 10, welche stromabwärts in die Zuleitung 11 des Dünnstoffs 3 in die Mischpumpe 4 einmündet. In dieser Ablaufleitung 10 kann eine Pumpe 15 vorhanden sein. Durch die Zugabe des Dünnstoffs 3, der z.B. als Siebwasser von der Papiermaschine abgezogen wurde, wird eine solche Stoffdichte eingestellt, wie sie zur Erzeugung des Papiers im Papiermaschinen- Stoffauflauf benötigt wird. Zur Vermischung dieser beiden Komponenten ist bekanntlich die Mischpumpe 4 ausgelegt. Neben der hier gezeigten Form der Eingabe sind auch andere Möglichkeiten bekannt.The mixing vessel 5 can be kept relatively small, with particular advantage, i. its volume is much lower than that normally chosen for mixed beets. At the bottom of the mixing vessel is the drain line 10, which opens downstream in the supply line 11 of the thin material 3 in the mixing pump 4. In this drain line 10, a pump 15 may be present. By the addition of the thinness 3, e.g. was removed as white water from the paper machine, such a consistency is set as needed to produce the paper in the paper machine headbox. For mixing these two components, it is known that the mixing pump 4 is designed. In addition to the form of input shown here, other possibilities are known.

In Fig. 2 ist eine weitere Form der erfindungsgemäßen Vorrichtung gezeigt, bei der das Mischgefäß 5' abweichend von dem in Fig. 1 gezeigten ein geschlossener, unter Überdruck stehender Tank ist. Dadurch kann das Mischsystem unter Druck gehalten werden. Das Mischgefäß 5' enthält einen Überlauf 15, mit dem das Niveau auf einem eingestellten Wert gehalten wird. Es kann auch mit einer Blende 16 versehen sein. Für den Fall, dass eine Rückströmung aus dem Mischrohr 6 abgeführt werden soll, ist fakultativ ein Anschlußstutzen 13 angedeutet.FIG. 2 shows a further form of the device according to the invention, in which the mixing vessel 5 ', unlike that shown in FIG. 1, is a closed, pressurized tank. This allows the mixing system to be kept under pressure. The mixing vessel 5 'contains an overflow 15, with which the level is kept at a set value. It can also be provided with a diaphragm 16. In the event that a return flow is to be removed from the mixing tube 6, a connecting piece 13 is optionally indicated.

Die Zugabe der gemischten Faserstoffsuspension erfolgt hier in eine gekrümmte Ansaugleitung für den Dünnstoff 3 mit einem zentralen Düsenrohr 14 für die Faserstoffsuspensionen.The mixed pulp suspension is added here in a curved suction line for the thin material 3 with a central nozzle tube 14 for the pulp suspensions.

Fig. 3 zeigt exemplarisch ein mögliches Regelkonzept für die in Fig. 2 dargestellte Vorrichtung. Dabei sind die in der Regeltechnik üblichen Bezeichnungen gewählt, so dass sich eine Erläuterung des Konzeptes erübrigt. Bei diesem Beispiel werden insgesamt vier Faserstoffkomponenten zusammengeführt. Deren Mengenregelung ist nur für den Zufluss der Faserstoffsuspension 1 explizit dargestellt. Die Zuflussregelung der anderen Komponenten kann ähnlich erfolgen, wobei deren Mengenverhältnisse untereinander vorgegeben sind.FIG. 3 shows an example of a possible control concept for the device shown in FIG. 2. The designations customary in the control technology are chosen, so that an explanation of the concept is unnecessary. In this example, a total of four pulp components are combined. Their volume control is shown explicitly only for the inflow of the pulp suspension 1. The inflow control of the other components can be similar, with their proportions among themselves are predetermined.

Claims (8)

  1. Apparatus for mixing together at least two different pulp suspensions (1, 2) intended for paper production and for mixing these with a thin material (3) of lower solid content than the pulp suspensions (1, 2), whereby a mixed suspension is obtained which is to be fed to a paper machine via a mixing pump (4), characterised in that the apparatus comprises a mixing vessel (5, 5') with at least one mixing pipe (6) disposed upstream with supply lines (8, 9) for the pulp suspensions (1, 2) and a discharge line (10) disposed downstream and leading to the mixing pump (4), and in that the discharge line (10) opens into the supply tine (11) of the thin material (3) to the mixing pump (4).
  2. Apparatus according to claim 1, characterised in that the mixing pipe (6) comprises at least one static mixer (7).
  3. Apparatus according to claim 1 or 2, characterised in that the mixing vessel (5, 5') comprises a mechanically drivable stirrer (12).
  4. Apparatus according to one of the preceding claims, characterised in that the mixing vessel (5') is closed and contrived for high pressure.
  5. Apparatus according to one of claims 1 to 3, characterised in that the mixing vessel (5) is open.
  6. Apparatus according to claim 5, characterised in that the discharge line (10) comprises a pump (15).
  7. Apparatus according to one of the preceding claims, characterised in that the volume of the mixing vessel (5, 5') is so dimensioned that when it is operating as specified, the average dwell time of the suspension is between 8 and 15 sec.
  8. Apparatus according to one of the preceding claims, characterised in that the mixing pipe (6) is so dimensioned that when it is operating as specified, an average flow rate of 1 to 2 m/sec is set.
EP00126764A 1999-12-13 2000-12-06 Device for mixing pulp suspension Expired - Lifetime EP1116818B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29921879U DE29921879U1 (en) 1999-12-13 1999-12-13 Device for mixing suspended fuel
DE29921879U 1999-12-13

Publications (3)

Publication Number Publication Date
EP1116818A2 EP1116818A2 (en) 2001-07-18
EP1116818A3 EP1116818A3 (en) 2001-10-31
EP1116818B1 true EP1116818B1 (en) 2006-05-31

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ID=8082892

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Application Number Title Priority Date Filing Date
EP00126764A Expired - Lifetime EP1116818B1 (en) 1999-12-13 2000-12-06 Device for mixing pulp suspension

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EP (1) EP1116818B1 (en)
AT (1) ATE328153T1 (en)
DE (2) DE29921879U1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110538602B (en) * 2019-07-18 2024-04-05 中山市马里奥机械科技有限公司 Mixing system of static mixer
CN111041877B (en) * 2019-12-30 2020-10-02 江苏金莲纸业有限公司 Pulping equipment for papermaking
CN116159521B (en) * 2023-03-20 2023-09-01 菲立智能装备(浙江)有限公司 Dynamic reactor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4125513A1 (en) * 1991-08-01 1993-02-04 Escher Wyss Gmbh Fibre suspension mixing - introduces thick suspension into centre of thin suspension flow at a faster speed with turbulence
FI103676B1 (en) * 1998-06-10 1999-08-13 Valmet Corp Process arrangement for the short circulation in a paper or tub machine

Also Published As

Publication number Publication date
EP1116818A2 (en) 2001-07-18
DE29921879U1 (en) 2000-03-16
DE50012855D1 (en) 2006-07-06
EP1116818A3 (en) 2001-10-31
ATE328153T1 (en) 2006-06-15

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