EP0181028B1 - Vorrichtung und Verfahren zum Herstellen von rohem oder gebleichtem chemimechanischem Holzstoff durch ein kontinuierliches Imprägnierungsverfahren - Google Patents

Vorrichtung und Verfahren zum Herstellen von rohem oder gebleichtem chemimechanischem Holzstoff durch ein kontinuierliches Imprägnierungsverfahren Download PDF

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Publication number
EP0181028B1
EP0181028B1 EP85201730A EP85201730A EP0181028B1 EP 0181028 B1 EP0181028 B1 EP 0181028B1 EP 85201730 A EP85201730 A EP 85201730A EP 85201730 A EP85201730 A EP 85201730A EP 0181028 B1 EP0181028 B1 EP 0181028B1
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EP
European Patent Office
Prior art keywords
tank
tanks
valve
discharge pump
pump
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
Application number
EP85201730A
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English (en)
French (fr)
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EP0181028A2 (de
EP0181028A3 (en
Inventor
Giorgio Gazza
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SICEM - SAGA SpA
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SICEM - SAGA SpA
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Priority to AT85201730T priority Critical patent/ATE41793T1/de
Publication of EP0181028A2 publication Critical patent/EP0181028A2/de
Publication of EP0181028A3 publication Critical patent/EP0181028A3/en
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Publication of EP0181028B1 publication Critical patent/EP0181028B1/de
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    • 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
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means

Definitions

  • chemimechanical wood pulp is prepared from perennial or annual plants, or from wood processing waste, by the following operations:
  • the process is discontinuous in the sense that all the material, in each processing stage, remains in its respective tank as there is no transfer between one tank and another during the various operations.
  • the impregnation and refining operations can be implemented in a single tank of special characteristics, but again discontinuously.
  • the material obtained then passes to the subsequent refining stages.
  • the problem which the present patent proposes to solve is to make the material flow continuous, and to make it possible to instantaneously vary the process parameters without waiting for the plant to be completely emptied, and thus without slowing-down the production rate.
  • this is made possible by connecting in series a certain number of impregnation tanks, each of which is provided with means for controlling the allowable maximum and minimum level, and means for feeding the wood suspension to any one or more of the downstream tanks, means also being provided for regenerating and recycling the liquor deriving from draining the coarse pulp downstream of the last tank, from which the pulp is fed to subsequent refining and continuation of the bleaching reaction.
  • control means and means for processing the physical and chemical characteristics of the products fed into the plant are also provided, these means controlling suitable multiway valves which regulate their flow through the plant, said control means also controlling the regulation, proportioning, recycling and flow of the reagents used (delignifying and bleaching agents, or only delignifying agents).
  • the material is passed from a first tank into which the product and reagents are continuously fed, to a series of subsequent tanks of which at least one can be kept substantially empty in turn, the level of the product suspension present in each tank being able to be set externally and used as a basis for regulating the flow from one tank to another and thus the total reaction time of the product, it also being possible to keep those products of different characteristics which are simultaneously present in the plant separate from each other. by virtue of said tank which is kept substantially empty in turn.
  • FIG. 1 The flow diagram shown on the drawings ( Figure 1) includes a silo 1, shown diagrammatically, from the base of which two screw feeders 2 withdraw the raw material in the form of crushed pieces of wood, commonly known as chips.
  • the screw feeders 2 discharge the chips on to conveyor belts 3 feeding a vibrating screen 4 which separates the dust and the chips lying outside the acceptable size range.
  • the accepted chips are fed by the conveyor belt 5 to the pair of proportioning screw feeders 6 feeding the size reduction unit 7, which converts the chips into a ground product able to form a wood suspension in water.
  • the size reduction unit 7 discharges the material on to a Redler conveyor 8 which conveys it to a vibration table 9 on which moisture sensing means 10 acting by induction are disposed.
  • the product passes from the vibrating table 9 to a continuous weighing device 11.
  • the data determined by the means 10 and 11 are transmitted in the form of electrical signals to an electronic processor CE which is programmed to calculate from them the "absolute dry" weight of the ground wood passing beyond the weighing means.
  • the procesor CE is also programmed to calculate the quantities of the various chemical products and water required for the treatment in accordance with the desired percentages and in accordance with the quantity of dry wood treated, and to transmit corresponding pulses to the various metering pumps 12A, 12B, 12C and 12D which withdraw the aqueous solutions of said products from the respective containers 13A, 13B, 13C and 13D.
  • the screened and weighed product is fed by a further Redler conveyor 14 to a screw feeder 15 to which the metered chemical products withdrawn from the tanks 13A, 13B, 13C and 13D are also fed.
  • the screw feeder 15 which is of variable speed, feeds the product together with the metered aqueous solutions to a first tank indicated by M.
  • Said tank M also receives the recycled liquid or liquor, which is regenerated to give it the required characteristics and in particular the same characteristics as the aforesaid mixture of aqueous solutions.
  • the recycled liquor is fed by the pipe 16 partly into the screw feeder 15 and partly directly into the tank M through the branches 17 and 18.
  • the tank M is provided with suitable mechanical mixers 19 and two electronic level sensors/indi- cators for maximum level 20 and minimum level 21 respectively, their positions being set by the processor CE, to which they feed their signals.
  • the tank M comprises an outlet pipe 22 containing a shut-off valve 23, and connected to the suction side of a pump 24.
  • the delivery pipe 25 from the pump 24 contains a control valve 26 operated by the processor CE as described hereinafter.
  • a three-way valve 27 Downstream of the valve 26 there is a three-way valve 27 which can direct the aqueous suspension either to a four-way valve 28 or directly to a tankA.
  • the tank A is provided with mechanical mixers indicated by 29 and with electronic level sensors/ indicators for maximum level 30 and minimum level 31 respectively, their positions being set by the processor CE to which they feed their signals.
  • the tank A comprises an outlet pipe 32 containing a shut-off valve 33 and connected to the suction side of a pump 34.
  • the delivery pipe 35 from the pump 34 contains a control valve 36 operated by the processor CE as described hereinafter.
  • the tank B is provided with mechanical mixers indicated by 38 and with electronic level sensors/ indicators for maximum level 39 and minimum level 40 respectively, their positions being set by the processor CE to which they feed their signals.
  • the tank B comprises an outlet pipe 41 containing a shut-off valve 42 and connected to the suction side of a pump 43.
  • the delivery pipe 44 from the pump 43 contains a control valve 45 operated by the processor CE as described hereinafter.
  • the pipe 44 Downstream of the valve 45, the pipe 44 leads to a three-way valve 46 from which there branch a pipe 47 opening into the tank C and a pipe 48 feeding a proportioning device 49 also controlled by CE and from which the material is partly recycled through 50 into the tank B and partly fed through 51 to a drainage screw 52, from which the separated solid material proceeds, to undergo subsequent refining and continuation of the bleaching reaction, and the residual liquor flows into the tank Z through 53.
  • a proportioning device 49 also controlled by CE and from which the material is partly recycled through 50 into the tank B and partly fed through 51 to a drainage screw 52, from which the separated solid material proceeds, to undergo subsequent refining and continuation of the bleaching reaction, and the residual liquor flows into the tank Z through 53.
  • the tank C is provided with mechanical mixers indicated by 52 and with electronic level sensors/ indicators for maximum level 55 and minimum level 56 respectively, their positions being set by the processor CE to which they feed their signals.
  • the tank C comprises an outlet pipe 57 containing a shut-off valve 58 and connected to the suction side of a pump 59.
  • the delivery pipe 60 from the pump 59 contains a control valve 61 operated by the processor CE as described hereinafter.
  • the pipe 60 Downstream of the valve 61, the pipe 60 leads to a three-way valve 62 from which there branch a pipe 63 opening into the tank D and a pipe 64 feeding a proportioning device 65 also controlled by CE and from which the material is partly recycled through 66 into the tank C and partly fed to the pipe 51.
  • the tank D is provided with mechanical mixers indicated by 67 and with electronic level sensors/ indicators for maximum level 68 and minimum level 69 respectively, their positions being set by the processor CE to which they feed their signals.
  • the tank D comprises an outlet pipe 70 containing a shut-off valve 71 and connected to the suction side of a pump 72.
  • the delivery pipe 73 from the pump 72 contains a control valve 74 operated by the processor CE as described hereinafter.
  • the pipe 73 Downstream of the valve 74 the pipe 73 leads to a proportioning device 75 also controlled by CE and from which the material is partly recycled through 76 into the tank D and partly fed to the pipe 51.
  • the tank Z to which the liquor trickling from the drainage screw 52 flows, is provided with means 77 for analysing said liquor which feed their data to the processor CE, which controls the metering pumps 12A, 12B, 12C and 12D so that they feed the reagents properly proportioned to make-up the solution characteristics to the required values.
  • the make-up reagents flow to the tank Z through the pipe 78 which is provided with a shut-off valve 79.
  • the tank Z is also provided with electronic temperature sensing/indicating means 80 which feed data to the processor CE for controlling the steam feed through the valve 81 in order to maintain the required temperature in Z.
  • the pump 83 namely the recycling pump, feeds the liquor through a control valve 95 and through the pipe 16 to the tank M and to the screw feeder 15.
  • the level indicators 20 and 21 feed their signals to the processor CE, this latter controlling the operation of the valve 95 and of the screw feeder 15.
  • the plant heretofore described can operate continuously in the following manner.
  • the tank M receives from the screw feeder 15 the material in the form of wetted chips together with the required reagent solution determined in accordance with the "absolute dry" weight of the fed material.
  • the reagent solution is partly recycled from the tank Z and partly withdrawn from the tanks 13A, 13B, 13C and 13D as a result of the instantaneous commands of the processor CE which receives data from the weighing means 11, from the moisture sensing means 10 and from the means 77 provided in the tank Z.
  • the pump 24 together with its valve units starts to operate under the control of the processor CE and feed material to the tank A, from which in the same manner the material passes to the tanks B, C and D by the successive operation of the pumps 34, 43 and 59 and their valve means.
  • the level in each tank is transmitted to the processor CE which controls the operation of the discharge pump of the upstream tank.
  • the material is withdrawn from the tank D by the pump 72 and partly fed to the subsequent processes and partly recycled to the tank D by the proportioning device 75.
  • the levels in the individual tanks are regulated means in practice that, once the process is properly operating, the total residence time of the material in the tanks can be set, and the reagents undergo continuous feed in the correct required quantities.
  • the three-way valves 46 and 62 are set to feed the pipes 47 and 63.
  • the entire procedure is controlled by the processor CE which on the basis of the data which it receives from the described means is able to control the process parameters to the required values for the entire process duration.
  • the described plant can, if required, operate in accordance with a cycle in which the tanks B, C and D are alternately filled, while the tank A remains inactive.
  • valve 27 is rotated so as to feed the valve 28, which fills the tanks B, C and D in succession.
  • the valves 46 and 62 are set in this case to feed the pipes 48 and 64.
  • the throughput of the pumps and of the relative valves is adjusted so that when the tanks C is full, the residence time required for the product in the tank B is complete.
  • the tank B begins to empty by the effect of its pump 43 and the relative valves, the product being discharged to the screw 52 through the proportioning device 49 and pipe 51, and partially recycled through 50.
  • valves 90, 91, 92, 93 and 94 are opened after emptying the tanks A, B, C or D, in order to wash the pipes and prevent the formation of blockages.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Claims (7)

1. Vorrichtung zur Herstellung von chemiemechanischem Holzbrei, der durch chemische Delignifizierung und Bleichung oder nur mit Delignifizierungsmittel imprägniert ist, dadurch gekennzeichnet, daß sie, den geeigneten zermalmenden und zermahlenden Einrichtungen nachgeschaltet, folgende Einrichtungen aufweist:
- Tanks, die die verschiedenen Reagenzien in wässriger Lösung enthalten, wobei jeder Tank mit einer Dosierpumpe versehen ist;
- ein Dosierschneckenförderer für besagte Stücke, dem folgende Einrichtungen zugeordnet sind:
- Einrichtung zum Messen des Feuchtegehaltes;
- Dauerwiegeeinrichtung, von welcher ein kontinuierlicher Strom besagter mechanischer Holzstoffstücke fließt, und zwar zu
- einem ersten Tank, der einen mechanischen Mischer aufweist, verstellbare elektronische Maximum- und Minimumniveauanzeiger und eine Entleerungspumpe, wobei das Material durch ein Stromregelventil selektiv gespeist wird, und zwar zu
- einer Mehrzahl von Tanks, die in Reihen angeordnet sind, wobei jeder Tank verstellbare elektronische Maximum- und Minimumniveauanzeiger aufweist, einen mechanischen Mischer und eine Entleerungspumpe, welche den nachgeschalteten Tank durch ein Stromregelventil speist;
- mindestens der letzte Tank der besagten Menrzahl von Tanks soll, der entsprechenden Entleerungspumpe nachgeschaltet, eine rotierende Dosiereinrichtung aufweisen, welche einen Teil der wässrigen Lösung zur Entwässerungseinrichtung speist, wobei der entwässerte Rohbrei in die nachfolgende Refinermahlung gespeist wird, und der übriggebliebene Teil der Lösung zu besagtem letzten Tank zurückgeführt wird;
- ein letzter Tank, der seine Flüssigkeit von besagter Entwässerungseinrichtung bezieht, um sie zu besagtem ersten Tank zurückzuführen, nachdem ihre physikalischen und chemischen Eigenschaften wiederhergestellt sind;
- eine elektronische Einrichtung, vorgesehen zur Erhaltung und Verarbeitung der Daten des . besagten Feuchtigkeitsmeßgerätes, der besagten Dauerwiegeeinrichtung und dem besagten Niveauanzeiger und zur Steuerung des Produkt- und Reagenzienflusses durch besagte Tanks.
2. Vorrichtung nach Anspruch 1, gekennzeichnet dadurch, daß dem Stromregelventil in der Druckleitung der Entleerungspumpe des ersten Tanks nachgeschaltet ein Drei-Wege-Ventil und ein Menrwegeventil in Serie verbunden sind, wobei das erste Ventil so angeordnet ist, daß es den Fluß abwechselnd entweder zum Mehrwegeventil oder zum ersten Tank besagter Menrzahl von Tanks speist, und das zweite Ventil ist so angeordnet, daß es den Fluß der Reihenfolge nach zu jedem der Tanks der besagten Mehrzahl von Tanks selektiv speist, mit Ausnahme des ersten Tanks.
3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß ein Drei-Wege-Ventil in der Druckzuleitung der entsprechenden Entleerungspumpe zwischen dem zweiten und den vorletzten Tank besagter Mehrzahl von Tanks vorgesehen ist, wobei die Druckzuleitung den Fluß entweder selektiv zum nächsten Tank oder zu einer rotierenden Dosiereinrichtung speist, welche selbst einen Teil des Flusses zu besagter Entwässerungseinrichtung speist und den übrigbleibenden Teil zu dem gleichen Tank zurückführt.
4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß besagter letzter Tank eine Entleerungspumpe aufweist, wobei deren Ausgangsleitung ein Stromregelventil aufweist und zum besagten ersten Tank führt.
5. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß besagter letzter Tank eine Entleerungspumpe aufweist, wobei deren Ausgangsleitung eine Anzahl von Verzweigungsleitungen aufweist, entsprechend der Anzahl der Tanks besagter Mehrzahl von Tanks und eine zusätzliche Verzweigungsleitung für besagten ersten Tank, wobei die Verzweigungsleitungen zu den Saugrohren der Entleerungspumpen des besagten ersten Tanks und zu den Tanks besagter Mehrzahl von Tanks führen, wobei in jeder Verzweigungsleitung ein Absperrventil vorgesenen ist.
6. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß jeder der Tanks ein Absperrventil oberhalb der entsprechenden Entleerungspumpe aufweist.
7. Vorrichtung nach den obengenannten Ansprüchen, dadurch gekennzeichnet, daß die Antriebsmotoren der Entleerungs- und Dosierpumpen, die Steuerventile, die Absperrventile, die Dosiergeräte und die Drei-Wege-Ventile und die Mehrwegeventile von dem elektronischen Prozessor gesteuert werden, welcher die Signale vom besagten Pegelsensor und von den Feuchtigkeitsmeß- und Dauerwiegeeinrichtungen erhält.
EP85201730A 1984-11-09 1985-10-23 Vorrichtung und Verfahren zum Herstellen von rohem oder gebleichtem chemimechanischem Holzstoff durch ein kontinuierliches Imprägnierungsverfahren Expired EP0181028B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85201730T ATE41793T1 (de) 1984-11-09 1985-10-23 Vorrichtung und verfahren zum herstellen von rohem oder gebleichtem chemimechanischem holzstoff durch ein kontinuierliches impraegnierungsverfahren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT4687684 1984-11-09
IT46876/84A IT1181139B (it) 1984-11-09 1984-11-09 Apparecchiatura e procedimento per la produzione di porte di legno semimeccaniche grezze o sbiancate con ciclo continuo di impregnazione

Publications (3)

Publication Number Publication Date
EP0181028A2 EP0181028A2 (de) 1986-05-14
EP0181028A3 EP0181028A3 (en) 1987-01-28
EP0181028B1 true EP0181028B1 (de) 1989-03-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP85201730A Expired EP0181028B1 (de) 1984-11-09 1985-10-23 Vorrichtung und Verfahren zum Herstellen von rohem oder gebleichtem chemimechanischem Holzstoff durch ein kontinuierliches Imprägnierungsverfahren

Country Status (4)

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EP (1) EP0181028B1 (de)
AT (1) ATE41793T1 (de)
DE (1) DE3569133D1 (de)
IT (1) IT1181139B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2785917B1 (fr) * 1998-11-16 2001-01-12 Wood & Pulp Ltd Procede et installation de production de pates a papier

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL43994C (de) * 1934-07-27
FR1393492A (fr) * 1964-02-11 1965-03-26 Du Pin Cellulose Perfectionnement au blanchiment des pâtes à papier
FR1562448A (de) * 1967-04-15 1969-04-04

Also Published As

Publication number Publication date
IT1181139B (it) 1987-09-23
DE3569133D1 (en) 1989-05-03
IT8446876A0 (it) 1984-11-09
EP0181028A2 (de) 1986-05-14
IT8446876A1 (it) 1986-05-09
ATE41793T1 (de) 1989-04-15
EP0181028A3 (en) 1987-01-28

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