EP3178989B1 - Method and device for treating a press felt - Google Patents

Method and device for treating a press felt 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
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EP
European Patent Office
Prior art keywords
carbon dioxide
water
cleaning water
pressure
felt
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EP16198949.6A
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German (de)
French (fr)
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EP3178989A1 (en
Inventor
Bernhard Thaller
Dejan Sibila
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Messer Austria GmbH
Messer Slovenija doo
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Messer Austria GmbH
Messer Slovenija doo
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Application filed by Messer Austria GmbH, Messer Slovenija doo filed Critical Messer Austria GmbH
Priority to PL16198949T priority Critical patent/PL3178989T3/en
Priority to RS20180717A priority patent/RS57392B1/en
Priority to SI201630051T priority patent/SI3178989T1/en
Publication of EP3178989A1 publication Critical patent/EP3178989A1/en
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Publication of EP3178989B1 publication Critical patent/EP3178989B1/en
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    • 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.

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

Description

Die Erfindung betrifft ein Verfahren zum Behandeln eines zum Entwässern einer Papierbahn eingesetzten Endlosfilzes in einem Prozess zur Produktion von Papier, bei dem der Endlosfilz während eines Umlaufs mittels mindestens einer Presswalze mit der Papierbahn in Kontakt gebracht wird, dabei Wasser aufnimmt, und anschließend mit über eine Hochdruckdüse zugeführtem Reinigungswasser zur Wiederherstellung einer saugfähigen Filzstruktur behandelt, in einer Trocknungseinrichtung getrocknet und zu der Presswalze rückgeführt wird. Die Erfindung betrifft zudem eine entsprechende Maschine. In Papier- oder Kartonmaschinen werden zahlreiche umlaufende Gewebebahnen eingesetzt. So finden beispielsweise in der Siebpartie einer Papiermaschine Siebbänder Verwendung, in der Pressenpartie sind es Pressfilze und in der Trockenpartie sogenannte Trockensiebe.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. In 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.

Bei den in modernen Maschinen zur Herstellung von Papier oder Pappe zum Einsatz kommenden Pressfilzen handelt es sich um umlaufende Endlosfilze, die an wenigstens einer Presswalze mit der zu trocknenden Papierbahn in Kontakt gebracht wird. Der Endlosfilz nimmt dabei Wasser aus der Papierbahn auf, das anschließend in einer Trocknungseinheit entfernt wird. Die Trocknungseinheit weist dazu beispielsweise Saugpressen und/oder eine oder mehrere Rohrsauger, in welchem/welchen das Wasser dem Endlosfilz mittels Vakuum entzogen wird, auf. Anschließend wird der Endlosfilz zur Papierbahn zurückgeführt. Durch das ständige Zusammenpressen und durch Aufnahme verschiedener organischer und anorganischer Verunreinigungen geht die Wasseraufnahmefähigkeit des Pressfilzes mit der Zeit zurück. Um dem entgegenzuwirken, wird der Pressfilz zum einen mit Wasser (im Folgenden auch "Reinigungswasser" genannt) behandelt, das unter einem hohen Druck von beispielsweise zwischen 3 bar und 50 bar aus einer Düse auf den Endlosfilz aufgetragen wird. Dies führt zu einer weitgehenden Wiederherstellung einer saugfähigen Gewebestruktur. Zum anderen erfolgt zur Beseitigung der organischen und anorganischen Verunreinigungen eine Behandlung mit Reinigungsmitteln, die in flüssiger Form von Zeit zu Zeit dem Reinigungswasser zugegeben und mit diesem auf den Endlosfilz aufgetragen werden.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. To counteract this, 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. This leads to a substantial restoration of an absorbent tissue structure. On the other hand, to eliminate the organic and inorganic impurities, 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.

Vorrichtungen, bei denen eine umlaufende Gewebebahn, insbesondere ein Pressfilz, mit Hochdruckwasser gereinigt wird, finden sich beispielsweise in der DE 102 52 812 A1 , der WO 00/42252 A1 oder der EP 1 085 121 B1 .Devices in which a circumferential fabric web, in particular a press felt, is cleaned with high-pressure water can be found, for example, in US Pat DE 102 52 812 A1 , of the WO 00/42252 A1 or the EP 1 085 121 B1 ,

In der DE 44 19 540 A1 wird eine Vorrichtung zur Reinigung einer umlaufenden Gewebebahn im laufenden Betrieb beschrieben, bei der gleichzeitig mindestens zwei unterschiedliche Medien auf die Gewebebahn aufgetragen werden. Als Reinigungsmedium kommen dabei in unterschiedlichen Kombinationen Druckluft, Wasser, Dampf oder Reinigungschemikalien, wie beispielsweise Ätznatron, zum Einsatz. Nachteilig bei diesem Gegenstand ist, dass diese Form der Reinigung mit einer erheblichen Kontamination des anfallenden Abwassers verbunden ist, mit der Folge einer aufwändigen Klärung bzw. Entsorgung.In the DE 44 19 540 A1 a device for cleaning a continuous fabric web during operation is described, in which simultaneously at least two different media are applied to the fabric web. As a cleaning medium come in different combinations of compressed air, water, steam or cleaning chemicals, such as caustic soda used. A disadvantage of this article is that this form of cleaning is associated with a significant contamination of the wastewater, with the result of a complicated clarification or disposal.

Auch aus der DE 20 2004 021 861 U1 ist eine Vorrichtung zum Reinigen einer umlaufenden Bespannung einer Maschine, beispielsweise eines Pressfilzes einer Papiermaschine, bekannt. Bei diesem Gegenstand wird ein Reinigungsfluid, insbesondere Wasser, unter einem Druck zwischen 3 bar und 50 bar mittels einer Reinigungsdüse auf das umlaufende Gewebe aufgetragen. Die Reinigungsdüse steht dabei während der Behandlung in direktem Kontakt mit der Bespannung, um das Reinigungsfluid in die Bespannung hineinzudrücken.Also from the DE 20 2004 021 861 U1 is a device for cleaning a circumferential covering of a machine, for example a press felt of a paper machine known. In this article, 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.

Die DE 10 2005 014 937 A1 beschreibt ein Reinigungsverfahren einer Bespannung in einer Maschine zur Herstellung einer Materialbahn, insbesondere einer Faserstoffbahn wie bspw. Papier-, Karton oder Tissuebahn, bei dem eine Bespannung der Maschine, beispielsweise ein umlaufender Pressfilz, mit einem flüssigen und/oder gasförmigen Reinigungsmedium beaufschlagt wird. Bei dem Reinigungsmedium kann es sich um Wasser, Dampf, Luft, Kohlendioxid oder ein Gemisch aus zumindest zwei dieser Komponenten handeln.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.

Aufgrund der hohen mechanischen Belastung kommt es jedoch mit der Zeit zu einer Volumenverringerung und damit zu einer deutlichen Abnahme der Wasseraufnahmefähigkeit des Pressfilzes. Dies führt zu einem entsprechend hohen Energieverbrauch einer sich an die Pressenpartie anschließenden Trockenpartie, in der üblicherweise etwa 95% der insgesamt zur Wasserentfernung benötigten Energie einer Papiermaschine aufgewendet werden. Zudem kommt es im Gewebe des Endlosfilzes zur Einlagerung anorganischer Verunreinigungen, insbesondere Kalkablagerungen, die derzeit meist mit einer die Umwelt belastenden Säurebehandlung bekämpft wird.Due to the high mechanical load, however, a reduction in volume occurs over time and thus a significant decrease in the water absorption capacity of the press felt. This leads to a correspondingly high energy consumption a drying section adjoining the press section, in which usually about 95% of the total energy required for water removal of a paper machine is expended. In addition, it comes in the fabric of the continuous felt for the storage of inorganic impurities, especially limescale, which is currently usually combated with an environmentally harmful acid treatment.

Aufgabe der Erfindung ist es somit, ein Verfahren bzw. eine Maschine zur Produktion von Papier, bei dem/der die Wiederherstellung der Wasseraufnahmefähigkeit des Endlosfilzes verbessert wird und Belastungen für die Umwelt reduziert werden.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.

Gelöst ist dieser Aufgabe durch ein Verfahren mit den Merkmalen des Patentanspruchs 1 sowie durch eine Maschine mit den Merkmalen des Patentanspruchs 4. Erfindungsgemäß wird somit bei einem Verfahren der eingangs genannten Art und Zweckbestimmung das zur Wiederherstellung einer saugfähigen Gewebestruktur des Endlosfilzes eingesetzte Reinigungswasser stromauf zur Hochdruckdüse mit Kohlendioxid versetzt. Durch die Einleitung von Kohlendioxid in das Reinigungswasser ergeben sich eine Reihe von Vorteilen.This object is achieved by a method having the features of claim 1 and by a machine having the features of claim 4. According to the invention, in a method of the type and purpose mentioned above, the cleaning water used to restore an absorbent fabric structure of the continuous felt upstream with the high pressure nozzle Carbon dioxide added. The introduction of carbon dioxide into the cleaning water results in a number of advantages.

Zum einen wird der pH-Wert und damit der Langelier-Index des Reinigungswassers gesenkt und dadurch die Bildung von Kalkablagerungen im Endlosfilz oder auf der Oberfläche des Endlosfilzes unterdrückt. Bei einem negativen Langelier-Index werden sogar bereits bestehende Ablagerungen zur Auflösung gebracht. Dadurch kann der Einsatz von Chemikalien zur Beseitigung anorganischer Ablagerungen reduziert werden oder sogar vollständig entfallen.On the one hand, 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. In a negative Langelier index even existing deposits are brought to resolution. As a result, the use of chemicals to eliminate inorganic deposits can be reduced or even completely eliminated.

Zum andern löst sich zumindest ein Teil des Kohlendioxids in dem unter Druck der Hochdruckdüse zugeführten Reinigungswasser. Das mit Kohlendioxid versetzte Reinigungswasser wird aus der Hochdruckdüse auf den Endlosfilz aufgetragen und dringt ganz oder teilweise in diesen ein, wobei es sich auf Umgebungsdruck entspannt. Bei diesem Druckabfall gast ein wesentlicher Teil des zuvor eingelösten Kohlendioxids aus und sorgt, sofern die Ausgasung innerhalb des Endlosfilzes erfolgt, für eine Volumenvergrößerung des Filzgewebes. Auf diese Weise trägt das Kohlendioxid zur Wiederherstellung der Wasseraufnahmefähigkeit des Endlosfilzes bei. Dadurch wird nicht nur die Lebensdauer des Endlosfilzes erhöht, sondern zugleich der Energiebedarf einer der Pressenpartie nachgeschalteten Trockenpartie nachhaltig gesenkt.On the other hand, at least part of 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. At this pressure drop, a significant portion of the previously redeemed carbon dioxide from and ensures, if the outgassing occurs within the continuous felt, for an increase in volume of the felt fabric. In this way, 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.

Das ausgasende Kohlendioxid gelangt in die Atmosphäre oder wird aufgefangen und kann in einem weiteren Prozess, beispielsweise in einem weiteren Verfahrensschritt in der Papierproduktion, eingesetzt werden. Kohlendioxid findet in der Papierherstellung in verschiedenen Prozessen Verwendung, beispielsweise bei der pH - Einstellung und Entwässerung der Fasersuspension, bei der in der DE 10 2006 042 429 A1 beschriebenen Reduzierung von Kleberresten (Stickies) in der Fasersuspension oder bei der synthetischen Herstellung von Kalziumkarbonat (CaCO3).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 ).

Das im Reinigungswasser verbleibende Kohlendioxid reduziert zudem den Langelier-Index des Abfallwassers und mindert die Bildung von Kalkablagerungen in den entsprechenden, das Abfallwasser führenden Leitungen.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.

Das Kohlendioxid wird im flüssigen Zustand in das Reinigungswasser eingespeist. Zur Zuführung von Kohlendioxid im flüssigen Zustand weist das Reinigungswasser einen Druck von mindestens 5,18 bar auf, damit sich das flüssige Kohlendioxid innig mit dem Reinigungswasser vermischen und sich dadurch gut einlösen kann.The carbon dioxide is fed in the liquid state in the cleaning water. For the supply of carbon dioxide in the liquid state, 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.

Das Reinigungswasser wird somit bevorzugt unter einem Druck von über 5,18 bar zur Hochdruckdüse transportiert und auf den Endlosfilz aufgetragen. Um mehr Kohlendioxid im Reinigungswasser lösen zu können, sieht eine vorteilhafte Ausgestaltung der Erfindung vor, das Reinigungswasser mit einem höheren Druck, beispielsweise zwischen 15 bar und 50 bar, zur Hochdruckdüse zu führen.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. To be able to dissolve more carbon dioxide in the cleaning water, provides an advantageous embodiment of the invention, the cleaning water with a higher pressure, for example, between 15 bar and 50 bar, to lead to the high pressure nozzle.

Ein wesentlicher Aspekt der Erfindung ist die Reduzierung anorganischer Ablagerungen auf der Oberfläche des Endlosfilzes oder im Innern des Filzgewebes. Daher sieht eine besonders vorteilhafte Ausgestaltung der Erfindung vor, dass die Zugabe von Kohlendioxid in das Reinigungswasser in Abhängigkeit von einem kontinuierlich oder in vorgegebenen Zeitabständen ermittelten chemischen oder physikalischen Parameter geregelt wird. Beispielsweise erfolgt eine Regelung auf einen bestimmten Wert oder Wertebereich von pH-Wert und/oder Langelier-Index des Reinigungswassers. Die Messung erfolgt mittels einer geeigneten Sonde, die beispielsweise im Bereich der Hochdruckdüse angeordnet ist. Der Sollwert der entsprechenden Regelgröße richtet sich nach den jeweiligen Anforderungen.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.

In einer besonders vorteilhaften Ausführungsform wird die Zuführung des Kohlendioxids so geregelt, dass der Langelier-Index des Reinigungswassers während der Behandlung des Endlosfilzes auf einem Wert von LSI ≤ 0 gehalten wird. Bei einem Wert des Langelier-Index von LSI = 0 kommt es nicht mehr zu Kalkablagerungen aus dem Reinigungswasser. Bei einem Langelier-Index von LSI < 0 können bereits gebildete Ablagerungen abgebaut werden. Alternativ oder ergänzend dazu können auch andere Parameter bestimmt und bei der Dosierung des Kohlendioxids einbezogen werden, wie beispielswese das Volumen des Filzes in einem vorgegebenen Abstand hinter dem Ort der Beaufschlagung des Reinigungswassers, dem Trocknungsgrad des Endlosfilzes oder dem Energieverbrauch in der sich an die Pressenpartie anschließenden Trockenpartie.In a particularly advantageous embodiment, 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. With a value of the Langelier index of LSI = 0, limescale deposits from the cleaning water no longer occur. With a Langelier index of LSI <0 already formed deposits can be reduced. Alternatively or additionally, 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.

Die Aufgabe der Erfindung wird auch mit einer Maschine mit den Merkmalen des Patentanspruchs 4 gelöst.The object of the invention is also achieved with a machine having the features of patent claim 4.

Eine Maschine zur Produktion von Papier weist einen über mindestens eine Presswalze zum Kontaktieren mit der zu entwässernden Papierbahn sowie über mindestens eine Umlenkrolle verspannten Endlosfilz, eine Vorrichtung zum Behandeln des Endlosfilzes mit einer an eine Wasserzuleitung angeschlossenen Hochdruckdüse zum Beaufschlagen des Endlosfilzes mit Reinigungswasser und einer Trocknungseinrichtung zur Trocknung des Endlosfilzes auf, wobei in die Wasserzuleitung, stromauf zur Hochdruckdüse, eine mit einer Quelle für flüssiges Kohlendioxid strömungsverbundene Zuleitung für Kohlendioxid einmündet, und wobei das Reinigungswasser bei der Zuführung des Kohlendioxids einen Druck von mindestens 5,18 bar aufweist und das Kohlendioxid im flüssigen Zustand in das Reinigungswasser eingespeist wird. Über die mit einer Quelle für Kohlendioxid, beispielsweise ein Tank oder ein Druckgasflaschenbündel, strömungsverbundene Zuleitung wird Kohlendioxid im flüssigen Zustand in das Reinigungswasser eingespeist. Das Kohlendioxid löst sich zumindest teilweise im Reinigungswasser und wird gemeinsam mit diesem aus der Hochdruckdüse auf den Endlosfilz aufgesprüht, wobei ein Teil des Reinigungswassers in das Gewebe des Endlosfilzes eindringt. Bei dem beim Austritt aus der Hochdruckdüse erfolgenden Druckabfall gast ein Teil des eingelösten Kohlendioxids aus und führt innerhalb des Gewebe des Endlosfilzes zu einer Volumenvergrößerung, die sich insbesondere positiv auf die Wiederherstellung der Saugfähigkeit des Filzes auswirkt.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. About the carbon dioxide with a source of carbon dioxide, such as a tank or a compressed gas cylinder bundle, flow-connected supply carbon dioxide is fed in the liquid state in the cleaning water. The carbon dioxide dissolves at least partially in the cleaning water and is sprayed together with this from the high-pressure nozzle onto the continuous felt, wherein a part of the cleaning water penetrates into the fabric of the endless felt. In the case of the pressure drop occurring at the outlet from the high-pressure nozzle, a portion of the carbon dioxide that has been dissolved in the gas exhausts and leads within the fabric of the endless felt an increase in volume, which has a particularly positive effect on the restoration of absorbency of the felt.

Die Hochdruckdüse kann im Übrigen schwenkbar gelagert und/oder auf einer quer zur Laufrichtung des Endlosfilzes verlaufenden Traversiervorrichtung angeordnet sein und mittels einer Steuerung bewegt werden, auch können mehrere Hochdruckdüsen zum Einsatz kommen, die an die Wasserzuleitung angeschlossen sind. Weiterhin ist es vorstellbar, die Hochdruckdüse mit mehreren Düsenköpfen auszurüsten, die sich quer zum Endlosfilz erstrecken und somit die gesamte Breite des Endlosfilzes gleichmäßig mit Reinigungswasser beaufschlagen. Zweckmäßigerweise ist zudem eine Absaugeinrichtung vorgesehen, mittels der das ausgasende und aus dem Endlosfilz austretende gasförmige Kohlendioxid zumindest weitgehend aufgefangen werden kann. Das aufgefangene Kohlendioxid kann beispielsweise in verschiedenen Prozessen, insbesondere in verschiedenen Teilprozessen der der Papierproduktion, vorteilhaft eingesetzt werden.Incidentally, 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. Furthermore, it is conceivable to equip the high-pressure nozzle with a plurality of nozzle heads which extend transversely to the continuous felt and thus uniformly apply cleaning water to the entire width of the endless felt. Appropriately, 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.

Eine besonders vorteilhafte Ausgestaltung der Erfindung sieht vor, dass die Zuleitung für Kohlendiodid mit einem Rückschlagventil ausgerüstet ist. Damit wird verhindert, dass während einer geregelten Zuführung des Kohlendioxids in das Reinigungswasser Wasser in die Kohlendioxidzuleitung einströmen kann. Ein zu diesem Zweck geeignetes Rückschlagventil wird beispielsweise in der EP 1 867 902 B1 oder der EP 2 179 782 B1 beschrieben. Um eine Einspeisung des üblicherweise bei einem Druck zwischen 15 bar und 22 bar gelagerten Kohlendioxids auch bei höheren Drücken in der Wasserzuleitung von beispielsweise 25 bar bis 30 bar oder mehr zu ermöglichen, ist die Zuleitung für Kohlendioxid zweckmäßigerweise mit einem Kompressor ausgerüstet. Alternativ oder ergänzend zu einem Kompressor ist in einer vorteilhaften Ausgestaltung der Erfindung an der Mündung der Zuleitung für Kohlendioxid in die Wasserzuleitung eine Venturidüse vorgesehen, mittels der das Kohlendioxid aufgrund des durch die Wasserzuleitung strömenden Wassers in die Wasserzuleitung eingesaugt wird. Die Wasserzuleitung ist mit einer bevorzugt im Bereich der Hochdruckdüse angeordneten Messsonde, und die Zuleitung für Kohlendioxid mit einem Regelventil ausgerüstet, wobei Messsonde und Regelventil mit einer Steuereinheit in Datenverbindung stehen. Mit dieser Anordnung kann der Kohlendioxideintrag von einem im Reinigungswasser gemessenen Parameter, beispielsweise dem pH-Wert, geregelt werden.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. In order to enable a feed of the usually stored at a pressure between 15 bar and 22 bar carbon dioxide even at higher pressures in the water supply, for example, 25 bar to 30 bar or more, the supply line for carbon dioxide is suitably equipped with a compressor. As an alternative or in addition to a compressor, in an advantageous embodiment of the invention, 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. With this arrangement, the carbon dioxide input can be controlled by a parameter measured in the cleaning water, for example the pH.

Anhand der Zeichnung soll ein Ausführungsbeispiel der Erfindung näher erläutert werden.Reference to the drawings, an embodiment of the invention will be explained in more detail.

Die einzige Zeichnung (Fig .1) zeigt schematisch den Ausschnitt einer Pressenpartie einer Papiermaschine mit einer erfindungsgemäßen Einrichtung zur Reinigung eines zur Pressung eingesetzten Endlosfilzes.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.

Bei der dargestellten Pressenpartie 1 einer Papiermaschine steht ein rundum laufender Endlosfilz (Pressfilz) 2 an zwei Presswalzen 3, 4 in Kontakt mit einer Papierbahn 5. Über mehrere Umlenkrollen 6 wird der Endlosfilz 2 - in Richtung des Pfeils 7 - an den Anfang der Pressenpartie, d.h. zu den Presswalzen 3, 4, zurückgeführt. Dabei durchläuft der Endlosfilz 2 nacheinander eine Reinigungseinrichtung 8 und eine Trocknungseinrichtung 9.In the illustrated 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. About several pulleys 6 of the endless felt 2 - in the direction of arrow 7 - to the beginning of the press section, ie returned to the press rolls 3, 4. The endless felt 2 successively passes through a cleaning device 8 and a drying device 9.

Die Reinigungseinrichtung 8 umfasst eine an eine Wasserzuleitung 11 angeschlossene Hochdruckdüse 12. Durch die Wasserzuleitung 11 wird Frischwasser oder gereinigtes Prozesswasser unter einem hohen Druck herangeführt und an der Hochdruckdüse 12 in Richtung auf den Endlosfilz 2 ausgestoßen. Die Hochdruckdüse 12 umfasst beispielsweise einen einzelnen Düsenkopf oder eine Mehrzahl von Düsenköpfen, der bzw. die beispielsweise verschwenkbar montiert sind und auf diese Weise die gesamte Breite des Endlosfilzes 2 mit Hochdruckwasser beaufschlagen. Es ist auch möglich, eine oder mehrere Hochdruckdüsen 12 auf einer - hier nicht gezeigten - sich quer über den Endlosfilz 2 erstreckenden Traverse fest oder verschiebbar anzuordnen um auf diese Weise eine gleichmäßige Beaufschlagung des Endlosfilzes 2 mit Hochdruckwasser zu erzielen, oder mehrere Hochdruckdüsen 12 - in Umlaufrichtung des Filzes gesehen - nacheinander anzuordnen.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. It is also possible, 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.

Die Trocknungseinrichtung 9 umfasst insbesondere eine Vakuum-Trocknungseinheit, beispielsweise einen oder mehrere Rohrsauger.The drying device 9 comprises, in particular, a vacuum drying unit, for example one or more tube suckers.

Stromauf zur Hochdruckdüse 12 mündet in die Wasserzuleitung 11 an einer Mündungsstelle 14 eine an einer hier nicht gezeigten Quelle für flüssiges Kohlendioxid angeschlossene Druckleitung 15 ein. Als Quelle für das Kohlendioxid kommt beispielsweise ein Gasflaschenbündel oder ein Standtank in Betracht, in dem das Kohlendioxid bei einem Druck von üblicherweise 15 bar bis 22 bar gelagert wird. Bei höheren Betriebsdrücken des Reinigungswassers ist daher ein Kompressor 13 vorhanden, mittels dessen der Druck des Kohlendioxids in der Druckleitung 15 dem höheren Betriebsdruck des Reinigungswassers in der Wasserzuleitung 11 angepasst wird. Anstelle eines Kompressors 13 kann zu diesem Zweck auch eine an der Mündungsstelle 14 angeordnete Venturidüse (hier nicht gezeigt) zum Einsatz kommen, mittels der das Kohlendioxid aus der Druckleitung 15 in die Wasserzuleitung 11 eingesaugt wird. Im Bereich der Mündungsstelle 14 ist in der Druckleitung 15 ein Rückschlagventil 16 vorgesehen, welches das Eindringen von Wasser aus der Wasserzuleitung 11 in die Druckleitung 15 verhindern soll. Weiterhin ist in der Druckleitung 15 ein ansteuerbares Regelventil 17 angeordnet. Das Regelventil 17, sowie eine im Bereich der Hochdruckdüse 12 angeordnete Messsonde 18, stehen mit einer Steuereinheit 19 in Datenverbindung.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. As 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. At higher operating pressures of the cleaning water, therefore, 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. Instead of a compressor 13, 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. In the area of the discharge point 14, 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.

Im Betrieb der Pressenpartie 1 laufen Papierbahn 5 und Endlosfilz 2 gleichsinnig durch die Presswalzen 3, 4. Dabei wird die Papierbahn 5 von den Presswalzen 3, 4, eng an den Endlosfilz 2 gepresst, wobei der Endlosfilz 2 Wasser aus der Papierbahn 5 aufnimmt. Der beladene Endlosfilz 2 wird anschließend zur Herstellung einer saugfähigen Gewebestruktur an der Hochdruckdüse 12 mit Wasser (nachfolgend als "Hochdruckwasser" bezeichnet) behandelt, das mit einem Druck von beispielsweise zwischen 15 bar und 30 bar auf den Endlosfilz aufgetragen wird und dabei teilweise in die Gewebestruktur des Endlosfilzes 2 eindringt. Im Anschluss daran wird in der Trocknungseinrichtung 9 ein wesentlicher Teil des vom Endlosfilz 2 aufgenommenen Wassers durch Absaugung entfernt und über eine Ableitung 21 abgeführt. Schließlich wird der Endlosfilz 2 über Umlenkrollen 6 zu den Presswalzen 3, 4 zurückgeführt.During operation of the press section 1, 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. Subsequently, in 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. Finally, the endless felt 2 is returned via deflection rollers 6 to the press rollers 3, 4.

Während des Betriebs kommt es zur Kontamination des Endlosfilzes 2 mit organischen und anorganischen Verunreinigungen, die sich im Gewebe des Endlosfilzes 2 absetzen. Zugleich verdichtet sich im Laufe der Zeit das Gewebe des Endlosfilzes 2 mit der Folge, dass die Wasseraufnahmefähigkeit des Endlosfilzes 2 sinkt.During operation, the continuous felt 2 is contaminated with organic and inorganic contaminants, which settle in the fabric of the endless felt 2. At the same time, 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.

Um beidem entgegenzuwirken, wird das Hochdruckwasser in der Wasserzuleitung 11 mit flüssigem Kohlendioxid aus der Druckleitung 15 versetzt. Das flüssige Kohlendioxid vermischt sich stromab zur Mündungsstelle 14 innig mit dem Hochdruckwasser und geht zumindest teilweise in Lösung. Das Hochdruckwasser wird dadurch angesäuert; pH-Wert und Langelier-Index gehen zurück. Das mit Kohlendioxid versetzte Hochdruckwasser wird an der Hochdruckdüse 12 auf die Oberfläche auf- sowie in das Gewebe des Endlosfilzes 2 eingetragen. Der beim Austritt aus der Hochdruckdüse 12 erfolgende Druckabfall auf Umgebungsdruck führt zu einer teilweisen Ausgasung des im Hochdruckwasser gelösten Kohlendioxids. Dadurch kommt es zu einer Volumenvergrößerung im Filzgewebe, die die Wasseraufnahmefähigkeit begünstigt.To counteract both, 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.

Über die Steuerung 19 und das Regelventil 17 wird die Zuführung des Kohlendioxids in Abhängigkeit von einem an der Messsonde 18 erfassten physikalischen oder chemischen Parameter des Hochdruckwassers, beispielsweise dem pH-Wert, geregelt. Beispielsweise wird der Kohlendioxid-Eintrag so gewählt, dass der Langelier-Index negativ wird ("CO2-Überdosierung"), oder es wird versucht, möglichst konstant einen pH-Wert im sauren Bereich von beispielsweise zwischen pH=5 und pH=6,5 im Reinigungswasser im Bereich der Hochdruckdüse 12 zu erzielen. Dadurch wird die Bildung von Kalkablagerungen vermieden, und bereits vorhandene Kalkablagerungen lösen sich auf. Weiterhin ist vorstellbar, dass eine Zuführung von Kohlendioxid über die Druckleitung 15 nur in vorgegebenen Zeitabständen erfolgt. Das Rückschlagventil 16 verhindert dabei, dass während einer Phase, in der kein Kohlendioxid über die Druckleitung 15 zugeführt wird, Hochdruckwasser aus der Wasserzuleitung 11 in die Druckleitung 15 eindringt. Mit Hilfe des Kompressors 13 wird der Druck des zugeführten Kohlendioxids gegebenenfalls an den Druck des Hochdruckwassers in der Wasserzuleitung 11 angepasst.The control of the 19 and the control valve 17, the supply of carbon dioxide in response to a detected at the measuring probe 18 physical or chemical parameters of the high-pressure water, such as the pH, regulated. For example, the carbon dioxide entry is chosen so that the Langelier index is negative ("CO 2 overdose"), or it is trying as constant as possible a pH in the acidic range, for example, between pH = 5 and pH = 6, 5 in the cleaning water in the high pressure nozzle 12 to achieve. As a result, the formation of limescale is avoided, and already existing lime deposits dissolve. Furthermore, it is conceivable that 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.

Im Rahmen der Erfindung können im Übrigen dem Hochdruckwasser zeitgleich oder zeitversetzt zur Zuführung des Kohlendioxids weitere Reinigungschemikalien zugesetzt werden, insbesondere laugenhaltige Reinigungsmittel zur Bekämpfung organischer Ablagerungen im Gewebe des Endlosfilzes 2.In the context of the invention, by the way, 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.

Durch den Einsatz der Erfindung wird die Wasseraufnahmefähigkeit des Endlosfilzes 2 verbessert, wodurch der Energiebedarf einer an sich an die Pressenpartie 1 anschließenden Trockenpartie (hier nicht gezeigt), in der der Wassergehalt der Papierbahn 5 mittels beheizter Walzen weiter reduziert wird, deutlich gesenkt wird. Weiterhin erübrigt sich die im Stande der Technik zur Bekämpfung anorganischer Ablagerungen übliche Einleitung mineralischer Säuren in das Hochdruckwasser. Die Zuführung des Kohlendioxids verbessert Regeneration und Lebensdauer des Filzgewebes, wodurch Stillstände aufgrund von Arbeiten zum Austausch des Endlosfilzes verringert oder gar ganz vermieden werden.By using the invention, 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.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Pressenpartiepress section
22
Endlosfilzendless felt
33
Presswalzepress roll
44
Presswalzepress roll
55
Papierbahnpaper web
66
Umlenkrolleidler pulley
77
Pfeilarrow
88th
Reinigungseinrichtungcleaning device
99
Trocknungseinrichtungdrying device
1010
--
1111
Wasserzuleitungwater supply
1212
Hochdruckdüsehigh-pressure nozzle
1313
Kompressorcompressor
1414
Mündungsstelleopening point
1515
Druckleitungpressure line
1616
Rückschlagventilcheck valve
1717
Regelventilcontrol valve
1818
Messsondeprobe
1919
Steuereinheitcontrol unit
2020
--
2121
Ableitungderivation

Claims (7)

  1. Method for treating an endless felt that in a process for the production of paper is used for dewatering a paper web, in which method the endless felt (2) during one revolution by means of at least one press roller (3, 4) is brought into contact with the paper web (5), herein absorbs water, and subsequently, treated by way of cleaning water for re-establishing an absorbent felt structure that is supplied by way of a high-pressure nozzle (12), is dried in a drying installation (9) and returned to the press roller (3, 4), wherein the cleaning water that is used for re-establishing an absorbent structure of the endless felt (2) upstream of the high-pressure nozzle (12) is carbonated with carbon dioxide, wherein the cleaning water in the supply of the carbon dioxide has a pressure of at least 5.18 bar, the carbon dioxide being fed into the cleaning water in the liquid state, and wherein at least part of the carbon dioxide dissolves in the cleaning water and conjointly with the cleaning water at least partially penetrates the felt.
  2. Method according to Claim 1, characterized in that the cleaning water is applied to the endless felt (2) at a pressure between 5.18 bar and 50 bar, preferably between 15 bar and 50 bar.
  3. Method according to either of Claims 1 and 2, characterized in that the supply of the carbon dioxide into the cleaning water is regulated according to a predefined program, depending on a value of a physical or chemical parameter such as, for example, a pH value or the Langelier index of the cleaning water, determined in a continuous manner or at predefined temporal intervals.
  4. Machine for the production of paper, having an endless felt (2) for dewatering a paper web, said endless felt (2) being tensioned by way of at least one pressure roller (3, 4) for contacting the paper web (5) to be dewatered, and by way of at least one deflection roller (6), and having a device (1) for treating the endless felt (2), said device (1) having a high-pressure nozzle (12), connected to a water supply line (11), for impinging the endless felt (2) with cleaning water, and a drying installation (9) for drying the endless felt (2), wherein a supply line (15) for carbon dioxide that in fluidic terms is connected to a source for liquid carbon dioxide opens into the water supply line (11) upstream of the high-pressure nozzle (12), wherein the cleaning water in the supply of the carbon dioxide has a pressure of at least 5.18 bar, the carbon dioxide being fed into the cleaning water in the liquid state, and wherein the water supply line (11) is equipped with a measuring probe (18), and the supply line (15) for the carbon dioxide is equipped with a regulating valve (17), wherein the measuring probe (18) and the regulating valve (17) for regulating the input of carbon dioxide into the cleaning water in terms of data are connected to a control unit (19).
  5. Machine according to Claim 4, characterized in that the supply line (15) for the carbon dioxide is equipped with a check valve (16).
  6. Machine according to either of Claims 4 and 5, characterized in that the supply line (15) for the carbon dioxide for the purpose of pressure matching is equipped with a compressor.
  7. Machine according to one of Claims 4 to 6, characterized in that the supply line (15) for the carbon dioxide opens into the water supply line (11) at a Venturi nozzle.
EP16198949.6A 2015-12-08 2016-11-15 Method and device for treating a press felt Active EP3178989B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL16198949T PL3178989T3 (en) 2015-12-08 2016-11-15 Method and device for treating a press felt
RS20180717A RS57392B1 (en) 2015-12-08 2016-11-15 Method and device for treating a press felt
SI201630051T SI3178989T1 (en) 2015-12-08 2016-11-15 Method and device for treating a press felt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102015015949.6A DE102015015949A1 (en) 2015-12-08 2015-12-08 Method and device for treating a press felt

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EP3178989A1 EP3178989A1 (en) 2017-06-14
EP3178989B1 true EP3178989B1 (en) 2018-03-28

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EP16198949.6A Active EP3178989B1 (en) 2015-12-08 2016-11-15 Method and device for treating a press felt

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

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AT400157B (en) 1993-06-21 1995-10-25 Andritz Patentverwaltung METHOD AND DEVICE FOR CLEANING A CONTINUOUS FABRIC PATTERN
FI3921U1 (en) 1999-01-12 1999-04-21 Valmet Corp Apparatus for cleaning paper machine tissues
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 (en) 2002-11-13 2004-06-03 Voith Paper Patent Gmbh Cleaning installation for a papermaking/finishing machine and especially a coating applicator, has a number of jet assemblies acting on the machine components to apply an intensive cleaning during working
DE202004021061U1 (en) 2004-04-10 2006-09-28 Zöller-Kipper GmbH Emptying device for garbage containers, has pressure booster mechanism interposed between hydraulic pump and hydraulic drive cylinder to produce force which is greater than weight of filled garbage container
DE202004021861U1 (en) * 2004-12-08 2012-01-20 Voith Patent Gmbh cleaning device
DE102005014937A1 (en) * 2005-04-01 2006-10-05 Voith Fabrics Patent Gmbh cleaning process
DE102005055988A1 (en) * 2005-11-24 2007-05-31 Voith Patent Gmbh Apparatus for cleaning moving belt, especially in papermaking machine, has cleaning device providing cleaning intensity automatically adjusted using belt properties evaluated by detector
DE102006027561A1 (en) 2006-06-14 2007-12-20 Messer France S.A.S Device for metering in a cryogenic medium
DE102006042429B3 (en) 2006-09-09 2008-01-24 Messer Austria Gmbh Removal of adhesive residues during the recycling of waste paper, comprises disintegrating the waste paper to an aqueous suspension and subjecting the suspension to a physicochemical treatment for separating coarse-grained residues
DE102008049337A1 (en) * 2008-09-29 2010-04-08 Messer Austria Gmbh Method and device for cleaning a continuous fabric web
DE102008052802A1 (en) 2008-10-22 2010-04-29 Messer France S.A.S Arrangement for introducing liquid carbon dioxide into a medium

Non-Patent Citations (1)

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Also Published As

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

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