EP0034095A1 - Verfahren und Anlage für die Zufuhr pflanzlicher Materien in Behandlungsbehälter vor der Verwendung bei einer Kochbehandlung oder einer Reaktion unter Druck - Google Patents

Verfahren und Anlage für die Zufuhr pflanzlicher Materien in Behandlungsbehälter vor der Verwendung bei einer Kochbehandlung oder einer Reaktion unter Druck Download PDF

Info

Publication number
EP0034095A1
EP0034095A1 EP81400176A EP81400176A EP0034095A1 EP 0034095 A1 EP0034095 A1 EP 0034095A1 EP 81400176 A EP81400176 A EP 81400176A EP 81400176 A EP81400176 A EP 81400176A EP 0034095 A1 EP0034095 A1 EP 0034095A1
Authority
EP
European Patent Office
Prior art keywords
liquid
pump
materials
dilution
installation
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
EP81400176A
Other languages
English (en)
French (fr)
Inventor
Charles Gueissaz
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.)
Compagnie de Construction Mecanique Sulzer
Original Assignee
Compagnie de Construction Mecanique Sulzer
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 Compagnie de Construction Mecanique Sulzer filed Critical Compagnie de Construction Mecanique Sulzer
Publication of EP0034095A1 publication Critical patent/EP0034095A1/de
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • D21C7/00—Digesters
    • D21C7/06—Feeding devices

Definitions

  • the subject of the present invention is a method and an installation intended to supply the processing chambers with plant materials which are to undergo cooking or a reaction under pressure.
  • This method and this installation are in particular intended to be used for supplying treatment chambers inside which the cooking of annual plants is carried out (wheat straw, rice, bagasse, reeds, etc.), in a detergent for the production of cellulose.
  • this method and this installation are also designed to be able to be used for feeding treatment chambers in which a hydrolysis of such plants is carried out to extract the pentosannes.
  • Such treatments are generally carried out under pressures of up to 10 to 12 bars. They can be carried out either continuously or, conversely, discontinuously.
  • the materials to be treated are introduced in the dry state, without prior impregnation, and the introduction device may consist of a rotary valve with cells, or an airlock with a drawer, or even a conical screw whose action has the effect of forming a pad of material supporting the pressure difference between the interior and the exterior.
  • the introduction device may consist of a rotary valve with cells, or an airlock with a drawer, or even a conical screw whose action has the effect of forming a pad of material supporting the pressure difference between the interior and the exterior.
  • these are complex and expensive devices, because they must be made so as to be able to withstand relatively high pressure and temperature differences.
  • these systems undergo very rapid wear, because despite prior cleaning, the plant materials to introduce contain silica dust incorporated into the fibers. This therefore requires an anti-abrasion treatment to be provided for the wearing parts.
  • such treatment is very expensive and despite this and the other precautions taken, the parts must be changed frequently.
  • the screw introduction devices present the danger of accidental expansion of steam upstream in the event of a supply fault, as a result of the disappearance of the plug from the material forming the plug, and supporting the pressure difference.
  • screw devices only work properly with dry materials; it is therefore impossible to pre-impregnate the products, an operation which significantly improves the quality of cooking.
  • the device thus provided may not be suitable for the introduction of annual plants or the like. Indeed, by the very nature of these plants, they tend to float when we try to dilute them in order to achieve a ponpable mixture. This is, moreover, the reason why such dilution is very difficult to achieve. Furthermore, as far as a liquid mixture could be obtained from such plants, this mixture can hardly be aspirated by a centrifugal pump. Indeed, as they affect the shape of fibers or stems of a certain length, annual plants tend to stuff in a centrifugal pump and can thus block its operation.
  • the discharge pressure should always be higher than that prevailing in the treatment enclosure so that there constantly flow of the liquid-solid mixture in the line of repression. In fact, if this is not the case, the introduction cannot take place and there can even be a backward flow of the materials contained in the discharge pipe, or even already introduced inside the treatment enclosure, with all the resulting disadvantages.
  • the object of the present invention is to provide a method and an installation making it possible to avoid the drawbacks of the various prior systems mentioned above.
  • the invention proposes to carry out the introduction of plant materials in liquid form, but by providing for a certain number of means and of particular provisions making it possible to obtain complete satisfaction.
  • the method according to the invention is characterized in that in addition to, or with, the dilution operation of the plant materials to be introduced, they are subjected to a thorough impregnation with the liquid in the presence of which must be carried out the treatment, then the discharge of the mixture obtained is carried out by means of a Vortex type pump, capable of conveying a liquid-solid mixture and which is driven at variable speed by means of a control device subject to a detector flow connected to the line from the discharge pump, so as to maintain constant the flow rate in this line.
  • a Vortex type pump capable of conveying a liquid-solid mixture and which is driven at variable speed by means of a control device subject to a detector flow connected to the line from the discharge pump, so as to maintain constant the flow rate in this line.
  • the installation shown in FIG. 1 comprises, first of all, an apparatus capable of ensuring both, and at the same time, the prepreg and the dilution of the corresponding plant materials with the liquid in the presence of which the planned treatment, in this case a detergent in the case of cooking for the production of cellulose.
  • This device is designated by the general reference 3 on the attached drawing.
  • This device comprises a tank containing a bath of the treatment liquid and in the bottom of which there is provided a rotor 4 provided with crushing fins capable of ensuring the separation of the fibers from the plant materials discharged into the tank as well as their shredding and their fragmentation into short pieces. An efficient impregnation of the fibers of these materials is thus obtained with the treatment liquid. However, this impregnation is also accompanied by a dilution of these fibers in the bath of the corresponding liquid, so as to produce a liquid-solid mixture capable of being pumped.
  • this dilution is carried out under perfect conditions, even if the materials to be treated are annual plants of the type indicated above. Indeed, as these materials are subjected to extensive impregnation with the treatment liquid, their dilution poses no problem, although normally they would have tended to float.
  • the liquid mixture obtained leaves the tank of the device 3 by an outlet nozzle 5. However, this is connected to a Vortex type pump, designated by the general reference 6 and which will be described in more detail below. .
  • a pipe 7 for the arrival of treatment liquid opens into the pulper 3.
  • This liquid may optionally be added water as will be explained later.
  • the purpose of this arrival of liquid is to ensure the dilution of the plant materials in the treatment liquid to a concentration of approximately 5-6% in dry matter in order to obtain a liquid mixture capable of being pumped by the pump 6 of Vortex type.
  • the body of this pump has a large flow passage with regular flow and without any hindrance. It comprises an open wheel 8 provided with a body 9 of aerodynamic shape and the arrangement is such that there is no vacuum at the rear of this wheel.
  • the ponp 6 Due to its design, and in particular the fact that in a Vortex stern, the sucked liquid is not brought to pass through the rotor (contrary to what is the case in a centrifugal pump), the ponp 6 is able to pump the liquid-solid mixture contained in the pulper 3. This pump then pressurizes this mixture at a pressure of the order of 5 to 8 bars and discharges it into a pipe 10. In fact, the role of pump 6 is both to convey the corresponding product and to overcome the pressure inside the treatment chamber.
  • the pressure of the pumped liquid mixture must be greater than the pressure prevailing in the treatment enclosure and, consequently, there must always be a flow rate in the discharge line.
  • the pump 6 is driven by a variable speed motor 6b and the speed thereof is adjusted so as to keep the delivery rate constant for a given production value in the treatment enclosure.
  • the flow rate inside the discharge line 10 is controlled by a flow meter 6a.
  • the latter is connected to an electrical circuit 6c connected to the motor 6b, so as to constitute a control device varying the speed of this motor as a function of the flow rate.
  • this device controls an acceleration of the pump speed to restore the flow rate. flow at the expected value.
  • This system therefore makes it possible to obtain, with absolute safety, that there is always flow in the direction of the treatment enclosure to be supplied despite the pressure prevailing therein and the flow irregularities which may occur downstream.
  • this system also plays, therefore, the role of a kind of non-return valve avoiding any risk of backtracking of the rejected materials, or those already introduced into the unit and this, under the effect of the pressure prevailing inside it.
  • the discharge pipe 10 leads to the inlet orifice 11 of a draining device 12 capable of wringing out the fibrous material while bringing it to the inlet tubing 13 of the treatment enclosure 1 to feed.
  • This drip device 12 is capable of safely resisting the working pressure.
  • Its external cylindrical envelope 14 contains a perforated cylinder 15 inside which is disposed a screw 16 capable of ensuring the movement of the fibrous material up to the outlet tube 17 connected to the inlet of the treatment enclosure 1
  • the shaft of the screw 15 is rotated by a gearmotor group, not shown.
  • the assembly thus formed is placed in an inclined position relative to the horizontal and a nozzle 18 for discharging the recovery liquid is provided at the lower part of the lowest end of the external envelope 12.
  • the inlet nozzle 11 opens into the space delimited by the perforated cylinder 15. Under these conditions, the mixture of liquid and fibrous material is sent under pressure into this space and taken up by the screw 16. That -ci causes this mixture to the outlet nozzle. However, the fibrous material is wrung out and the liquid eliminated flows through the perforations of the cylinder 15 to gain the gap existing around it and finally the outlet nozzle 18.
  • the transport screw 16 rotates with a reduced clearance inside the cylinder 15, which ensures the advance of the fibrous material while operating a constant cleaning of this grid. It should also be observed that this screw is provided, at its upper end, with a back-turn 19 which aims to avoid any risk of jamming at the location of the outlet 17 of the draining device. At its entrance, the latter receives the mixture loaded with vegetable fibers at a maximum concentration of 6% and minimum of 2%. After draining in this apparatus, the concentration is brought to the outlet to about 18 or 20%.
  • a minimum level of liquid is maintained in the drainage device 12 as well as in a balance pot 20 communicating with the latter.
  • a level adjustment device 27 is provided, subject to two level detectors 27a and 27b. This device is capable of controlling, via circuits 28a and 28b, two valves respectively 28 and 29.
  • the first is a valve for adjusting the flow rate inside a pipe 21 connected to the outlet of the pot 20 for recycling the treatment liquid used to transport and entrain the plant materials.
  • the second valve 29 it consists of a quick-closing safety valve, which is connected to the discharge line 10.
  • this device makes it possible to maintain constant the level of liquid contained in the lower part of the draining apparatus, which makes it possible to avoid the entry of vapor into the liquid circuit.
  • the present installation comprises, in combination with the devices already described, a circuit for recycling the treatment liquid, which circuit comprises a device for settling and removing heavy particles suspended in this liquid.
  • This device consists of a centrifugal separator 23 inside which the recovered liquid is brought by line 21 connected to the balance pot 20. After elimination of the particles in suspension, the liquid leaves this separator through a pipe 22. Quant particles and impurities that have been removed - in this case particles of sand, silica - they are collected in the lower hopper of the separator 22.
  • This hopper communicates with a pot 24 intended to serve as an airlock for the evacuation of impurities .
  • the inlet and outlet ports of this airlock are closed by valves, 25 and 26 respectively.
  • the liquid recovered in line 22 is returned to line 7 intended to dilute the impregnated materials, and this, by lover of the pump 6.
  • a regulating device 34 ensuring the expansion of this liquid, from the discharge pressure up to the injection pressure in the pulper 3. This device operates automatically by measuring the pressure and valve of the liquid stream by means of a valve 35.
  • the pipe 7 for supplying the dilution liquid is connected not only to the pipe 22 for recycling but also to a pipe 36 intended to ensure the arrival of make-up liquid.
  • An automatic level control device 37 regulates the supply of make-up liquid or the discharge of the excess to keep the level constant in the pulper 3.
  • the pump 6 ensures the continuous supply of the treatment enclosure 1 with plant materials which are in suspension in a liquid mixture having a concentration of approximately 18 to 20% of fibers. This supply is ensured at a relatively reduced pressure of the order of 4 to 8 bars which will constitute the pressure at which the treatment will be carried out inside the enclosure.
  • the installation according to the invention makes it possible to ensure, in an optimum manner, the introduction of plant materials into a treatment enclosure, even when annual plants are involved.
  • the process of introducing these materials takes place under perfect conditions, because the adjustment of the speed of this pump makes it possible to maintain a constant flow rate inside the discharge pipe.
  • the present installation is not limited to the single example described above.
  • the pulper apparatus 3 carrying out both the impregnation and the dilution of the materials to be treated, is replaced by two separate apparatuses 3a and 3b ensuring respectively the one and the other of these two functions.
  • the impregnation device 3a is arranged upstream of the dilution device 3b.
  • the first of these devices may consist of a drum fitted with blades and rotating inside a housing containing a bath of the treatment liquid. On leaving this device, the plant materials are therefore perfectly impregnated with this liquid.
  • the dilution device 3b As for the dilution device 3b, it consists of a tank inside which is disposed a simple rotary agitator 4b, this tank being supplied with treatment liquid by the pipe 7, as in the previous embodiment.
  • a discharge pipe 5b leads the mixture obtained to the pump 6 (not shown) and the rest of the installation is identical to what is provided in the previous embodiment.

Landscapes

  • Treatment Of Fiber Materials (AREA)
  • Paper (AREA)
EP81400176A 1980-02-05 1981-02-04 Verfahren und Anlage für die Zufuhr pflanzlicher Materien in Behandlungsbehälter vor der Verwendung bei einer Kochbehandlung oder einer Reaktion unter Druck Ceased EP0034095A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8002441A FR2475083A1 (fr) 1980-02-05 1980-02-05 Procede et installation pour l'alimentation d'enceintes de traitement, en matieres vegetales devant y subir une cuisson ou une reaction sous pression
FR8002441 1980-02-05

Publications (1)

Publication Number Publication Date
EP0034095A1 true EP0034095A1 (de) 1981-08-19

Family

ID=9238206

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400176A Ceased EP0034095A1 (de) 1980-02-05 1981-02-04 Verfahren und Anlage für die Zufuhr pflanzlicher Materien in Behandlungsbehälter vor der Verwendung bei einer Kochbehandlung oder einer Reaktion unter Druck

Country Status (2)

Country Link
EP (1) EP0034095A1 (de)
FR (1) FR2475083A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1226093A (fr) * 1958-06-04 1960-07-08 Buss Ag Procédé pour l'apport et l'enlèvement continu de substances solides dans un appareil se trouvant sous pression ou en dépression et dispositif pour la mise en oeuvre du procédé
FR1431464A (fr) * 1964-04-16 1966-03-11 Kamyr Ab Installation formée d'un digesteur à cellulose à marche continue et de son dispositif de chargement
US3874996A (en) * 1973-04-02 1975-04-01 Sterling Drug Inc Chip feeder for high pressure pulping system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1226093A (fr) * 1958-06-04 1960-07-08 Buss Ag Procédé pour l'apport et l'enlèvement continu de substances solides dans un appareil se trouvant sous pression ou en dépression et dispositif pour la mise en oeuvre du procédé
FR1431464A (fr) * 1964-04-16 1966-03-11 Kamyr Ab Installation formée d'un digesteur à cellulose à marche continue et de son dispositif de chargement
US3874996A (en) * 1973-04-02 1975-04-01 Sterling Drug Inc Chip feeder for high pressure pulping system

Also Published As

Publication number Publication date
FR2475083B1 (de) 1984-10-19
FR2475083A1 (fr) 1981-08-07

Similar Documents

Publication Publication Date Title
CA1070866A (fr) Procede pour le compactage et l'essorage des boues fluides chargees de matieres fibreuses
FR2693130A1 (fr) Ensemble de traitement de vieux papiers.
EP0443961A1 (de) Vorrichtung zur Vorbehandlung von Kunststoffabfällen vor ihrer Wiederaufbereitung
JP4859953B2 (ja) セルロースチップを高圧連続蒸解システムに供給する方法
EP0404647A1 (de) Vorrichtung zur Flüssigkeitsentgasung
FR2597127A1 (fr) Procede et appareil de raffinage de matiere fibreuse
CA2228845A1 (en) Single roll displacement wash press
FR2459303A1 (fr) Installation de traitement d'une matiere fibreuse contenant de la charpie
FR2569432A1 (fr) Procede de traitement de vieux papiers
NO315092B1 (no) Fremgangsmåte og skumprosessenhet for å produsere en uvevet bane av fibermateriale
EP0034095A1 (de) Verfahren und Anlage für die Zufuhr pflanzlicher Materien in Behandlungsbehälter vor der Verwendung bei einer Kochbehandlung oder einer Reaktion unter Druck
FR2885371A1 (fr) Installation pour la mise en oeuvre d'un procede de production de pate a papier, de lignines et de sucres et procede de production au moyen d'une telle installation
FR2611755A1 (fr) Procede et installation pour le traitement thermique de fils textiles notamment par thermofixation
FR2492860A1 (fr) Procede et appareil de raffinage de pate par defibrage, notamment de pate a papier
FR2534490A1 (fr) Dechiqueteur
BE1006214A6 (fr) Un procede de fabrication de papier.
EP0566476B1 (de) Laufradreinigung für eine Wasch/Trockenmaschine
FR2486557A1 (fr) Installation pour dissoudre les vieux papiers pour en extraire des fibres utiles pour la fabrication de papier, carton, ou carton-pate
FR2796865A1 (fr) Tambour destine a un appareil de traitement de dechets et appareil correspondant
EP0058610A1 (de) Verfahren und Einrichtung zum Erreichen eines Hochvakuums mit Gebrauch einer Einstufen-Flüssigkeitsringpumpe
FR2462512A1 (fr) Construction d'une cuve a double fond
FR2544757A1 (fr) Procede et appareil de digestion pour la production de pulpe de haute qualite
FR2470179A1 (fr) Dispositif perfectionne pour la separation de fils encolles sur une installation d'encollage
EP0737762B1 (de) Einrichtung zum Beliefern mit Fasermaterial einer Textilmaschine, insbesondere einer Karde
EP0363282B1 (de) Verwendung einer Düse mit convergent-divergenten Profil in einer Ausstossvorrichtung eines Wurzelschneiders

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT DE FR GB IT SE

17P Request for examination filed

Effective date: 19810806

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19831118

RIN1 Information on inventor provided before grant (corrected)

Inventor name: GUEISSAZ, CHARLES