EP3178989B1 - Procédé et dispositif de traitement d'un feutre de presse - Google Patents

Procédé et dispositif de traitement d'un feutre de presse Download PDF

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Publication number
EP3178989B1
EP3178989B1 EP16198949.6A EP16198949A EP3178989B1 EP 3178989 B1 EP3178989 B1 EP 3178989B1 EP 16198949 A EP16198949 A EP 16198949A EP 3178989 B1 EP3178989 B1 EP 3178989B1
Authority
EP
European Patent Office
Prior art keywords
carbon dioxide
water
cleaning water
pressure
felt
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.)
Active
Application number
EP16198949.6A
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German (de)
English (en)
Other versions
EP3178989A1 (fr
Inventor
Bernhard Thaller
Dejan Sibila
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.)
Messer Austria GmbH
Messer Slovenija doo
Original Assignee
Messer Austria GmbH
Messer Slovenija doo
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 Messer Austria GmbH, Messer Slovenija doo filed Critical Messer Austria GmbH
Priority to SI201630051T priority Critical patent/SI3178989T1/en
Priority to PL16198949T priority patent/PL3178989T3/pl
Priority to RS20180717A priority patent/RS57392B1/sr
Publication of EP3178989A1 publication Critical patent/EP3178989A1/fr
Application granted granted Critical
Publication of EP3178989B1 publication Critical patent/EP3178989B1/fr
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Classifications

    • 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
    • D21F1/32—Washing wire-cloths or felts
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts
    • D21F7/12—Drying

Definitions

  • the invention relates to a method for treating an endless felt used for dewatering a paper web in a process for the production of paper, in which the continuous felt is brought into contact with the paper web during one revolution by means of at least one press roll, takes up water, and then with over a Treated cleaning water to restore an absorbent felt structure, dried in a drying device and recycled to the press roll.
  • the invention also relates to a corresponding machine.
  • paper or board machines numerous circumferential webs are used. For example, in the wire section of a paper machine, filter belts are used, in the press section they are press felts and in the dryer section so-called dryer fabrics.
  • the press felts used in modern machines for the production of paper or paperboard are circumferential endless felts, which are brought into contact with the paper web to be dried on at least one press roll.
  • the continuous felt absorbs water from the paper web, which is then removed in a drying unit.
  • the drying unit has, for example, suction presses and / or one or more tube suckers in which the water is removed from the continuous felt by means of vacuum. Subsequently, the endless felt is returned to the paper web. Due to the constant compression and absorption of various organic and inorganic impurities, the water absorption capacity of the press felt decreases with time.
  • the press felt is firstly treated with water (also referred to below as "cleaning water") which is applied from a nozzle to the continuous felt at a high pressure of, for example, between 3 bar and 50 bar.
  • cleaning water also referred to below as "cleaning water”
  • a treatment with cleaning agents which are added in liquid form from time to time the cleaning water and applied with this on the continuous felt.
  • a device for cleaning a circumferential covering of a machine for example a press felt of a paper machine known.
  • a cleaning fluid in particular water, applied under a pressure between 3 bar and 50 bar by means of a cleaning nozzle on the rotating fabric.
  • the cleaning nozzle stands during the treatment in direct contact with the fabric to push the cleaning fluid into the fabric.
  • the DE 10 2005 014 937 A1 describes a cleaning method of a clothing in a machine for producing a material web, in particular a fibrous web such as paper, cardboard or tissue web, in which a covering of the machine, for example, a rotating press felt, with a liquid and / or gaseous cleaning medium is applied.
  • the cleaning medium may be water, steam, air, carbon dioxide or a mixture of at least two of these components.
  • the object of the invention is therefore a process or a machine for the production of paper, in which the restoration of the water absorbency of the continuous felt is improved and environmental pollution is reduced.
  • the pH value and thus the slowing index of the cleaning water is lowered, thereby suppressing the formation of lime deposits in the continuous felt or on the surface of the endless felt.
  • a negative Langelier index even existing deposits are brought to resolution.
  • the use of chemicals to eliminate inorganic deposits can be reduced or even completely eliminated.
  • the carbon dioxide dissolves in the cleaning water supplied under pressure to the high-pressure nozzle.
  • the carbon dioxide-added cleaning water is applied from the high pressure nozzle on the continuous felt and penetrates wholly or partly in this, whereby it relaxes to ambient pressure.
  • the carbon dioxide contributes to restoring the water absorbency of the continuous felt. This not only increases the life of the endless felt, but at the same time sustainably reduced the energy requirement of a dryer section downstream of the press section.
  • the outgassing carbon dioxide enters the atmosphere or is collected and can be used in a further process, for example in a further process step in paper production.
  • Carbon dioxide is used in papermaking in various processes, for example in the pH adjustment and dewatering of the fiber suspension, in which DE 10 2006 042 429 A1 described reduction of adhesive residues (stickies) in the fiber suspension or in the synthetic production of calcium carbonate (CaCO 3 ).
  • the remaining carbon dioxide in the cleaning water also reduces the Langelier index of waste water and reduces the formation of limescale in the corresponding, the waste water lines leading.
  • the carbon dioxide is fed in the liquid state in the cleaning water.
  • the cleaning water has a pressure of at least 5.18 bar, so that the liquid carbon dioxide intimately mix with the cleaning water and thus can redeem well.
  • the cleaning water is thus preferably transported under a pressure of more than 5.18 bar to the high-pressure nozzle and applied to the continuous felt.
  • the cleaning water with a higher pressure, for example, between 15 bar and 50 bar, to lead to the high pressure nozzle.
  • An essential aspect of the invention is the reduction of inorganic deposits on the surface of the continuous felt or in the interior of the felted fabric. Therefore, a particularly advantageous embodiment of the invention provides that the addition of carbon dioxide is regulated in the cleaning water in response to a determined continuously or at predetermined time intervals chemical or physical parameters. For example, a control to a certain value or range of pH and / or Langelier index of cleaning water. The measurement is carried out by means of a suitable probe, which is arranged for example in the region of the high-pressure nozzle. The setpoint of the corresponding controlled variable depends on the respective requirements.
  • the supply of carbon dioxide is controlled so that the Langelier index of the cleaning water during the treatment of the continuous felt is maintained at a value of LSI ⁇ 0.
  • a value of the Langelier index of LSI 0
  • a Langelier index of LSI ⁇ 0 already formed deposits can be reduced.
  • other parameters may also be determined and included in the metering of the carbon dioxide, such as the volume of the felt at a predetermined distance past the point of application of the cleaning water, the degree of drying of the continuous felt or the energy consumption in the press section drying section.
  • a machine for the production of paper has an at least one press roll for contacting with the paper web to be dewatered and over at least one deflection roller tensioned endless felt, a device for treating the continuous felt with a high pressure nozzle connected to a water supply for applying the endless felt with cleaning water and a drying device for Drying of the continuous felt, wherein in the water supply, upstream of the high-pressure nozzle, a fluidly connected to a source of liquid carbon dioxide feed line for carbon dioxide, and wherein the cleaning water at the supply of carbon dioxide has a pressure of at least 5.18 bar and the carbon dioxide in the liquid Condition is fed into the cleaning water.
  • the high-pressure nozzle can be pivotally mounted and / or arranged on a traverse device running transversely to the running direction of the continuous felt and moved by means of a control.
  • Several high-pressure nozzles can also be used, which are connected to the water supply line.
  • a suction device is also provided, by means of which the outgassing and emerging from the continuous felt gaseous carbon dioxide can be at least largely absorbed.
  • the collected carbon dioxide can be advantageously used, for example, in various processes, in particular in different sub-processes of paper production.
  • a particularly advantageous embodiment of the invention provides that the feed line for carbon dioxide is equipped with a check valve. This prevents water from flowing into the carbon dioxide feed line during a controlled supply of carbon dioxide into the cleaning water.
  • a suitable for this purpose check valve for example, in the EP 1 867 902 B1 or the EP 2 179 782 B1 described.
  • the supply line for carbon dioxide is suitably equipped with a compressor.
  • a Venturi nozzle is provided at the mouth of the feed line for carbon dioxide into the water feed line, by means of which the carbon dioxide is sucked into the water feed line due to the water flowing through the water feed line.
  • the water supply line is equipped with a measuring probe, which is preferably arranged in the region of the high-pressure nozzle, and the feed line for carbon dioxide is equipped with a control valve, wherein the measuring probe and control valve are in data communication with a control unit.
  • the only drawing ( Fig .1 ) schematically shows the section of a press section of a paper machine with a device according to the invention for cleaning an endless felt used for pressing.
  • press section 1 of a paper machine is an all-round continuous felt (press felt) 2 on two press rollers 3, 4 in contact with a paper web 5.
  • press felt continuous felt
  • the endless felt 2 successively passes through a cleaning device 8 and a drying device 9.
  • the cleaning device 8 comprises a high-pressure nozzle 12 connected to a water supply line 11. Fresh water or purified process water is introduced under high pressure through the water supply line 11 and discharged at the high-pressure nozzle 12 in the direction of the endless felt 2.
  • the high-pressure nozzle 12 includes, for example, a single nozzle head or a plurality of nozzle heads, which are mounted, for example, pivotable and act in this way the entire width of the endless felt 2 with high pressure water.
  • one or more high-pressure nozzles 12 on a - not shown here - across the endless felt 2 extending traverse fixed or slidable to achieve in this way uniform loading of the endless felt 2 with high pressure water, or multiple high-pressure nozzles 12 - Viewing direction of the felt - to arrange one after the other.
  • the drying device 9 comprises, in particular, a vacuum drying unit, for example one or more tube suckers.
  • a pressure line 15 a Upstream to the high-pressure nozzle 12 opens into the water supply line 11 at an outlet point 14 a connected to a source of liquid carbon dioxide, not shown here, a pressure line 15 a.
  • a source of carbon dioxide for example, a gas cylinder bundle or a stationary tank into consideration, in which the carbon dioxide is stored at a pressure of usually 15 bar to 22 bar.
  • a compressor 13 is provided, by means of which the pressure of the carbon dioxide in the pressure line 15 is adapted to the higher operating pressure of the cleaning water in the water supply line 11.
  • a venturi nozzle (not shown here) may be used for this purpose, by means of which the carbon dioxide from the pressure line 15 is sucked into the water supply line 11.
  • a check valve 16 is provided in the pressure line 15, which is intended to prevent the ingress of water from the water supply line 11 into the pressure line 15. Furthermore, a controllable control valve 17 is arranged in the pressure line 15. The control valve 17 and a measuring probe 18 arranged in the region of the high-pressure nozzle 12 are in data connection with a control unit 19.
  • the paper web 5 and endless felt 2 run in the same direction through the press rolls 3, 4.
  • the paper web 5 is pressed tightly against the endless felt 2 by the press rolls 3, 4, the continuous felt 2 receiving water from the paper web 5.
  • the loaded continuous felt 2 is then treated with water (hereinafter referred to as "high-pressure water") for producing an absorbent fabric structure at the high-pressure nozzle 12, which is applied to the continuous felt at a pressure of, for example, between 15 bar and 30 bar and partially into the fabric structure of the endless felt 2 penetrates.
  • high-pressure water water
  • the drying device 9 a substantial part of the water absorbed by the endless felt 2 is removed by suction and removed via a discharge line 21.
  • the endless felt 2 is returned via deflection rollers 6 to the press rollers 3, 4.
  • the continuous felt 2 is contaminated with organic and inorganic contaminants, which settle in the fabric of the endless felt 2.
  • the tissue of the continuous felt 2 becomes denser over time, with the result that the water absorption capacity of the endless felt 2 decreases.
  • the high-pressure water in the water supply line 11 is mixed with liquid carbon dioxide from the pressure line 15.
  • the liquid carbon dioxide mixes downstream of the mouth 14 intimately with the high pressure water and is at least partially in solution.
  • the high-pressure water is acidified by this; pH value and Langer index go back.
  • the high-pressure water mixed with carbon dioxide is applied to the surface of the high-pressure nozzle 12 and introduced into the fabric of the endless felt 2.
  • the pressure drop to ambient pressure occurring at the exit from the high-pressure nozzle 12 leads to a partial outgassing of the carbon dioxide dissolved in the high-pressure water. As a result, there is an increase in volume in the felt fabric, which favors the water absorbency.
  • CO 2 overdose negative
  • a supply of carbon dioxide via the pressure line 15 takes place only at predetermined time intervals.
  • the check valve 16 prevents that during a phase in which no carbon dioxide is supplied via the pressure line 15, high-pressure water from the water supply line 11 penetrates into the pressure line 15. With the aid of the compressor 13, the pressure of the supplied carbon dioxide is optionally adapted to the pressure of the high-pressure water in the water supply line 11.
  • further cleaning chemicals can be added to the high-pressure water at the same time or with a time delay for supplying the carbon dioxide, in particular alkali-containing cleaning agents for controlling organic deposits in the fabric of the endless felt 2.
  • the water absorption capacity of the endless felt 2 is improved, whereby the energy requirement of a subsequent to the press section 1 dryer section (not shown here), in which the water content of the paper web 5 is further reduced by means of heated rollers, is significantly reduced. Furthermore, the usual in the art for controlling inorganic deposits introduction of mineral acids in the high-pressure water is unnecessary. The supply of carbon dioxide improves felt fabric regeneration and life, thereby reducing or even eliminating stoppages due to replacement of the continuous felt.

Landscapes

  • Paper (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)

Claims (7)

  1. Procédé pour le traitement d'un feutre continu agencé pour le drainage d'une bande de papier dans un processus de production de papier, dans lequel le feutre continu (2) est mis en contact avec la bande de papier (5) au moyen d'au moins un rouleau presseur (3, 4) au cours d'une circulation, drainant ainsi de l'eau, et est ensuite traité avec de l'eau de nettoyage projetée par une buse à haute pression (12) afin de restaurer une structure de feutre absorbant, séché dans un dispositif de séchage (9) et ramené au rouleau presseur (3, 4), dans lequel l'eau de nettoyage agencée pour restaurer une structure absorbante du feutre continu (2) est chargée en dioxyde de carbone en amont de la buse à haute pression (12), dans lequel l'eau de nettoyage comporte lors de l'apport du dioxyde de carbone une pression d'au moins 5,18 bar et le dioxyde de carbone est injecté à l'état liquide dans l'eau, et dans lequel un minimum d'une partie du dioxyde de carbone se dissout dans l'eau de nettoyage et pénètre au moins partiellement dans le feutre avec l'eau de nettoyage.
  2. Procédé selon la revendication 1, caractérisé en ce que l'eau de nettoyage est projetée sur le feutre continu (2) sous une pression comprise entre 5,18 bar et 50 bar, de préférence entre 15 bar et 50 bar.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'apport du dioxyde de carbone dans l'eau de nettoyage est régulé selon un programme prédéfini en fonction d'une valeur d'un paramètre physique ou chimique déterminée en continu ou à des intervalles de temps prédéfinis, comme par exemple la valeur du pH ou l'indice de saturation de Langelier de l'eau de nettoyage.
  4. Machine de production du papier, dotée d'un feutre continu (2) pour le drainage d'une bande de papier, lequel est étendu sur au moins un rouleau presseur (3, 4) pour le contact avec la bande de papier (5) à drainer ainsi que sur au moins une poulie de guidage (6), et dotée d'un dispositif (1) pour le traitement du feutre continu (2), lequel comporte une buse à haute pression (12) raccordée à une conduite d'arrivée d'eau (11) pour appliquer de l'eau de nettoyage au feutre continu (2) et un dispositif de séchage (9) pour le séchage du feutre continu (2), dans laquelle une conduite d'arrivée (15) pour le dioxyde de carbone, raccordée à une source de dioxyde de carbone liquide, débouche dans la conduite d'arrivée d'eau (11) en amont de la buse à haute pression (12), dans laquelle l'eau de nettoyage comporte lors de l'apport du dioxyde de carbone une pression d'au moins 5,18 bar et le dioxyde de carbone est injecté à l'état liquide dans l'eau, et dans laquelle la conduite d'arrivée d'eau (11) est équipée d'une sonde de mesure (18) et la conduite d'arrivée (15) pour le dioxyde de carbone est équipée d'une valve de régulation (17), dans laquelle la sonde de mesure (18) et la valve de régulation (17) sont connectées à une unité de commande (19), en vue de la régulation de l'apport de dioxyde de carbone dans l'eau de nettoyage.
  5. Machine selon la revendication 4, caractérisée en ce que la conduite d'arrivée (15) pour le dioxyde de carbone est équipée d'un clapet antiretour (16).
  6. Machine selon la revendication 4 ou 5, caractérisée en ce que la conduite d'arrivée (15) pour le dioxyde de carbone est équipée d'un compresseur en vue d'ajuster la pression.
  7. Machine selon l'une des revendications 4 à 6 ci-dessus, caractérisée en ce que la conduite d'arrivée (15) pour le dioxyde de carbone débouche sur la conduite d'arrivée d'eau (11) à une buse à effet Venturi.
EP16198949.6A 2015-12-08 2016-11-15 Procédé et dispositif de traitement d'un feutre de presse Active EP3178989B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SI201630051T SI3178989T1 (en) 2015-12-08 2016-11-15 A process and a device for processing a pressed felt
PL16198949T PL3178989T3 (pl) 2015-12-08 2016-11-15 Sposób i urządzenie do obróbki filcu prasy
RS20180717A RS57392B1 (sr) 2015-12-08 2016-11-15 Postupak i uređaj za tretman presovanog filca

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015015949.6A DE102015015949A1 (de) 2015-12-08 2015-12-08 Verfahren und Vorrichtung zum Behandeln eines Pressfilzes

Publications (2)

Publication Number Publication Date
EP3178989A1 EP3178989A1 (fr) 2017-06-14
EP3178989B1 true EP3178989B1 (fr) 2018-03-28

Family

ID=57321238

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16198949.6A Active EP3178989B1 (fr) 2015-12-08 2016-11-15 Procédé et dispositif de traitement d'un feutre de presse

Country Status (9)

Country Link
EP (1) EP3178989B1 (fr)
DE (1) DE102015015949A1 (fr)
ES (1) ES2672971T3 (fr)
HU (1) HUE038134T2 (fr)
LT (1) LT3178989T (fr)
MA (1) MA41769A (fr)
PL (1) PL3178989T3 (fr)
RS (1) RS57392B1 (fr)
SI (1) SI3178989T1 (fr)

Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
AT400157B (de) 1993-06-21 1995-10-25 Andritz Patentverwaltung Verfahren und vorrichtung zur reinigung einer umlaufenden gewebebahn
FI3921U1 (fi) 1999-01-12 1999-04-21 Valmet Corp Laitteisto paperikoneen kudosten puhdistamiseksi
US6360758B1 (en) 1999-09-10 2002-03-26 Metso Paper, Inc. Cleaning device in paper machines, board machines or other similar machines for cleaning a fabric, such as wire or felt
DE10252812A1 (de) 2002-11-13 2004-06-03 Voith Paper Patent Gmbh Maschine zur Herstellung und/oder Veredelung einer Materialbahn mit zugehöriger Reinigungsanordnung und Reinigungsverfahren
DE202004021061U1 (de) 2004-04-10 2006-09-28 Zöller-Kipper GmbH Vorrichtung zum Entleeren von Müllbehältern
DE202004021861U1 (de) * 2004-12-08 2012-01-20 Voith Patent Gmbh Reinigungsvorrichtung
DE102005014937A1 (de) * 2005-04-01 2006-10-05 Voith Fabrics Patent Gmbh Reinigungsverfahren
DE102005055988A1 (de) * 2005-11-24 2007-05-31 Voith Patent Gmbh Reinigungsverfahren und Vorrichtung
DE102006027561A1 (de) 2006-06-14 2007-12-20 Messer France S.A.S Vorrichtung zum Eindosieren eines kryogenen Mediums
DE102006042429B3 (de) 2006-09-09 2008-01-24 Messer Austria Gmbh Verfahren zum Entfernen von Kleberresten bei der Wiederverwertung von Altpapier
DE102008049337A1 (de) * 2008-09-29 2010-04-08 Messer Austria Gmbh Verfahren und Vorrichtung zur Reinigung einer umlaufenden Gewebebahn
DE102008052802A1 (de) 2008-10-22 2010-04-29 Messer France S.A.S Anordnung zum Eintragen von flüssigem Kohlendioxid in ein Medium

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
LT3178989T (lt) 2018-07-10
SI3178989T1 (en) 2018-08-31
MA41769A (fr) 2018-03-28
PL3178989T3 (pl) 2018-09-28
EP3178989A1 (fr) 2017-06-14
ES2672971T3 (es) 2018-06-19
HUE038134T2 (hu) 2018-09-28
RS57392B1 (sr) 2018-09-28
DE102015015949A1 (de) 2017-06-08

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