EP2761080A1 - Operating method for a stock preparation zone - Google Patents

Operating method for a stock preparation zone

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Publication number
EP2761080A1
EP2761080A1 EP12766412.6A EP12766412A EP2761080A1 EP 2761080 A1 EP2761080 A1 EP 2761080A1 EP 12766412 A EP12766412 A EP 12766412A EP 2761080 A1 EP2761080 A1 EP 2761080A1
Authority
EP
European Patent Office
Prior art keywords
parameter
pulp suspension
chest
measuring
control
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.)
Granted
Application number
EP12766412.6A
Other languages
German (de)
French (fr)
Other versions
EP2761080B1 (en
Inventor
Jens Haag
Christian Naydowski
Jürgen KÄSER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Priority to EP14189989.8A priority Critical patent/EP2851466B1/en
Publication of EP2761080A1 publication Critical patent/EP2761080A1/en
Application granted granted Critical
Publication of EP2761080B1 publication Critical patent/EP2761080B1/en
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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
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/38—Conserving the finely-divided cellulosic material
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/28—Tanks for storing or agitating pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0018—Paper-making control systems controlling the stock preparation

Definitions

  • the invention relates to an operating method for a stock preparation of a paper, tissue or board machine for producing a fibrous web, comprising at least one chest for the preparation and storage of a pulp suspension.
  • Machines for producing a paper or fibrous web always include an area in which the fibrous materials from which the fibrous web is produced in the machine are processed. This area is commonly called stock preparation.
  • the stock preparation is followed by the constant part of the machine, in which the fibers, which were prepared in the stock preparation to a pulp suspension, are diluted so far that a fiber suspension with about 1 to 2% solids content is formed, which then on the headbox on The molding mesh is applied and dewatered there.
  • the constant part consists of a cycle in which large quantities of process water are circulated.
  • process water the fibers, auxiliaries and ash particles, etc., from which the fibrous web is produced in the machine, are transported and processed in such a way that a uniform pulp suspension with a desired consistency is available in the machine headbox.
  • various laid paper are provided.
  • several laid paper are arranged one behind the other, in which the pulp is stored, mixed and / or treated in different concentrations and quantities.
  • an anaerobic condition occurs during standstill.
  • this anaerobic growth in the laid paper causes the finished product to discolor and smells bad, the probability of a web break increases many times over.
  • the increased use of chemicals also leads to an undesirably high concentration of chemicals in the constant part, since not all chemicals are discharged from the material cycle with the finished paper.
  • An essential object of the invention is to propose an improved, but at least alternative, batch operation / batch management, which is characterized in particular by a more stable operation.
  • an operating method for a stock preparation of the type mentioned at the outset which has a measurement / control / regulation Device, wherein by means of the measuring / control / regulating device at least one property parameter of the pulp suspension is determined, and by means of the measuring / control / regulating device, at least one conditioning parameter of the pulp suspension is adjusted such that at least a quality parameter of the pulp suspension remains in at least one chest within a predetermined interval when a threshold value of at least one property parameter is reached, undershot or exceeded.
  • An operating method or also batch management is understood to mean a method by which the at least one chest can be controlled or regulated in order to always provide a sufficient stock of pulp suspension with quality parameters suitable for fiber web production.
  • Property parameters suitable for this purpose are preferably parameters which can be selected from the following group of property parameters: a physical parameter, such as temperature, bin fill level, suspension of the pulp suspension or degree of mixing, a chemical parameter, such as pH, gas concentrations, etc. a biological parameter, such as the presence of certain protozoa, such as bacteria or fungal spores - a biochemical parameter, such as bacteria or fungus precipitants, that grow in the pulp suspension.
  • a physical parameter such as temperature, bin fill level, suspension of the pulp suspension or degree of mixing
  • a chemical parameter such as pH, gas concentrations, etc.
  • a biological parameter such as the presence of certain protozoa, such as bacteria or fungal spores -
  • a biochemical parameter such as bacteria or fungus precipitants
  • the measurement of an oxygen saturation in the pulp suspension by means of the measuring / control / regulating device is suitable as a property parameter.
  • the redox potential can also be used as a meaningful property parameter or measurand.
  • the selected property parameter (s) can be selected within the stock be measured at various points, in particular at the entrance / in and / or at the exit of the Bütte.
  • At least one of the preparation parameters can be changed by means of the measuring / control / regulating device: a filling level in the chest, in particular if the biocide infestation is very large, the level then preferably being is lowered to reduce the amount of infested suspension. a thorough mixing of the pulp suspension, if, in particular in a Bütte, a dead area has formed. a composition of the pulp suspension.
  • the composition of the fiber suspension can be changed in various ways, so biocides and / or other additives can be mixed into the pulp suspension.
  • the mixing of the fiber suspension can be changed by changing the flow in the chest when changing at least one quality parameter of the pulp suspension. This is achieved in a preferred manner in that the flow in the chest is changed by means of a stirrer. This can be done for example by means of an additionally installed agitator or by Lufteinschnüffelung.
  • the object is achieved by means of a device, wherein this comprises at least one chute for the preparation and storage of a pulp suspension and a measuring / control / regulating device, wherein by means of the measuring / control / regulating device at least one property parameter the Faserstoffsus- pension can be determined, and by means of the measuring / control / regulating device, at least one conditioning parameter of the pulp suspension is adaptable such that at least one quality parameter of the pulp suspension remains in at least one Bütte within a predetermined interval, if a Threshold of at least one property parameter reached, undercut or exceeded becomes.
  • the measuring / control / regulating device consists of at least one measuring point, a matching device for changing the quality parameters of the suspension and an evaluation unit or control or regulating device.
  • the adaptation device is a metering, stirring and / or blowing device.
  • biocide use can be advantageously reduced.
  • FIG. 1 shows the essential components of the wastepaper stock preparation of a paper machine.
  • the waste paper is dissolved into a uniform pulp, the necessary water comes wholly or partly from the machine.
  • the collection bin (s) 2 are designed so that it can be stored in their pulp for about 1 -10 hours of operation of the paper machine or that it takes 1 to 10 hours to the pulp once replaced.
  • a pulper is understood as meaning a large mixing vat used in industry in the production of paper, board or tissue webs in order to further dissolve the pulp.
  • the volume of the pulper 3 is between 12 and 100 m 3 .
  • Inn Pulper 3 the pulp is further dissolved and diluted with the addition of process water.
  • the consistency of the resulting pulp suspension in the pulper 3 is about 10 to 18%.
  • Contaminants such as garbage, metal wires, sand, etc., which can not be removed beforehand, e.g. Sand, are then sorted out by means of a Schwerteilcleaners 5. Contaminants that can not be filtered out by the screen plate of Schwerteilcleaners 5 can still be removed in subsequent finer grades, pre-sorting.
  • the purified pulp suspension is then pumped into the pulper Ableerbütte 6, which can stockpile a supply of also about 1-10 hours. Before the pulp suspension enters the process water cycle, the fiber fraction which is not suitable for papermaking is sorted out in a presorting 7.
  • the pulp suspension is stored intermediately before it is fed to the process water of the constant part. This is done in a mixing device in which the pulp suspension is diluted with process water to a pulp suspension with about 3 to 6% solids.
  • the mixing device can also be used to mix other proportions of pulps and solids of the pulp suspension.
  • the machine chest 10 is the last chest before the headbox. It already belongs to the constant part 14 of the paper machine. In order to ensure a constant suspension pressure in the constant part, it is always necessary to pump at least as much pulp suspension from the mixing chest into the machine chest that it has a constant level of fill level. This is achieved by constantly pumping more fiber suspension into the machine chest from the mixing chest, as is removed from the machine chest 10. The excess portion passes through an overflow back into the mixing tank, so on the one hand, the level is always kept constant and the contents of the machine chest constantly in motion, so there is always a uniform pulp suspension under constant pressure conditions. In some, not shown, downstream of the dilution stages, a further dilution of the pulp suspension before it finally reaches the machine via the headbox.
  • measuring devices are provided by means of which the formation of anaerobic states can be recognized. These can be oxygen measuring devices, redox potential measuring devices, pH measuring devices and / or temperature measuring devices. The measurement takes place either directly in the chest, or inside the chest, or in the feed or discharge of the laid paper.
  • the measured property parameter (s) of the pulp suspension are processed in the measuring / control / regulating device and by means of the measuring / control / regulating device at least one conditioning parameter of the pulp suspension is adapted in such a way that at least one quality parameter Parameter of the pulp suspension remains in at least one chest within a predetermined interval, when a threshold value of at least one property parameter is reached, exceeded or exceeded.
  • the situation is assessed by means of individual measurements or by combining several measurements. As soon as a condition is reached which indicates the danger of an excessive growth or the aggravation of an anaerobic condition, a further aggravation can be counteracted. For counteracting or stopping the anaerobic growth, various intervention options are available by means of which the conditioning parameters can be changed.
  • a simple and effective way to stop growth is to empty the affected tub as well as the laid paper adjacent to this tub. This prevents new material from being directly re-infested. Since this is usually not so easy, especially in the machine chest is not possible at all, the quality level is only lowered and by means of a Dosiervorrich- changed the biocide dosage to stock preparation.
  • the biocides can be metered into the water cycle at various points.
  • the metering before and / or directly in the affected paper by means of a metering device.
  • the metered addition of the biocides can be kept low if the amount of the affected suspension is low and the level is low.
  • the stock preparation is operated such that the lowest level of biocidal growth, the level of the affected and the subsequent laid paper is lowered and parallel to the biocide is increased and only when the biocidal growth is stopped, the level is increased again.
  • recirculation devices can be provided which change the circulation within a chest by deliberately changing the flow in the chest such that the sources of production of anaerobic growth herds, which usually arise in dead zones, are moved out of these.
  • the speed of the mixing device can be changed in the Mischbütten or an additional mixing device, such as a Heileinschnüffelung be provided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

The invention relates to an operating method for a stock preparation zone in a paper, tissue or cardboard machine for producing a fibrous web, comprising at least one vat for preparing and storing a fibrous stock suspension and a measuring/control/regulating apparatus, wherein at least one property parameter of the fibrous stock suspension is determined by means of the measuring/control/regulating apparatus, and at least one preparation parameter for the fibrous stock suspension is adapted by means of the measuring/control/regulating apparatus in such a way that at least one quality parameter of the fibrous stock suspension in at least one vat remains within a predefined interval when at least one property parameter reaches, falls short of, or exceeds a threshold value.

Description

Betriebsverfahren für eine Stoff auf bereitung  Operating procedure for a substance preparation
Die Erfindung betrifft ein Betriebsverfahren für eine Stoffaufbereitung einer Papier-, Tissue- oder Kartonmaschine zur Herstellung einer Faserstoffbahn, umfassend zumindest eine Bütte zur Aufbereitung und Bevorratung einer Faserstoffsuspension. The invention relates to an operating method for a stock preparation of a paper, tissue or board machine for producing a fibrous web, comprising at least one chest for the preparation and storage of a pulp suspension.
Maschinen zur Herstellung einer Papier- oder Faserstoffbahn umfassen immer auch einen Bereich in dem die Faserstoffe, aus der in der Maschine die Faserstoffbahn hergestellt wird, aufbereitet werden. Dieser Bereich wird allgemein Stoffaufbereitung genannt. Machines for producing a paper or fibrous web always include an area in which the fibrous materials from which the fibrous web is produced in the machine are processed. This area is commonly called stock preparation.
An die Stoffaufbereitung schließt sich der Konstantteil der Maschine an, in dem die Faserstoffe, der in der Stoffaufbereitung zu einer Faserstoffsuspension aufbereitet wurden, so weit verdünnt werden, dass eine Fasersuspension mit ca. 1 bis 2% Feststoffanteil entsteht, die anschließend über die Stoffauflaufdüse auf das For- miersieb aufgebracht und dort entwässert wird. The stock preparation is followed by the constant part of the machine, in which the fibers, which were prepared in the stock preparation to a pulp suspension, are diluted so far that a fiber suspension with about 1 to 2% solids content is formed, which then on the headbox on The molding mesh is applied and dewatered there.
Im Wesentlichen besteht der Konstantteil aus einem Kreislauf, in dem große Mengen Prozesswasser im Kreislauf gefahren werden. In diesem Prozesswasser werden die Fasern, Hilfsstoffe und Ascheteilchen usw., aus der in der Maschine die Faserstoffbahn hergestellt wird, transportiert und derart aufbereitet, dass im Stoff- auflauf der Maschinen eine gleichmäßige Faserstoffsuspension mit einer gewünschten Konsistenz zur Verfügung steht. Essentially, the constant part consists of a cycle in which large quantities of process water are circulated. In this process water, the fibers, auxiliaries and ash particles, etc., from which the fibrous web is produced in the machine, are transported and processed in such a way that a uniform pulp suspension with a desired consistency is available in the machine headbox.
Der größte Teil des Prozesswassers durchdringt das Formiersieb und wird als sogenanntes Weißwasser, Wasser mit einem relativ hohem Feststoffanteil, in den Konstantteilkreislauf, zum Verdünnen der Faserstoffsuspension aus der Stoffaufbe- reitung, zurückgeführt. Most of the process water penetrates the forming fabric and is recycled as so-called white water, water with a relatively high solids content, into the constant circulation system for diluting the pulp suspension from the stock preparation.
Grob zusammengefasst gilt, dass der größte Teil des Prozesswassers im Konstantteilkreislauf im Kreis gefahren wird. Nur der Teil des Wassers und die Feststoffantei- le, die mit der Faserstoffbahn weiter durch die Maschine transportiert werden, müssen im Konstantteil kreislauf ersetzt werden. Das sind im Wesentlichen Frischfa- ser und/oder Altpapierfasern, Asche und Wasser. Roughly summarized, the majority of the process water in the constant-circulation circuit is circulated. Only the part of the water and the solids that are transported further through the machine with the fibrous web must be replaced in the constant-flow circuit. These are essentially fresh water and / or waste paper fibers, ash and water.
Bei der Herstellung der Faserstoffsuspension aus Altpapier kommt es allerdings regelmäßig zu einem anaeroben Wachstum in der Stoffaufbereitung und Konstantteil, insbesondere wenn es zu Maschinenstillständen kommt. Zudem reichern und/oder sammeln sich Stoffe im Konstantteil regelmäßig an, wodurch sie sehr lange in Teilbereichen des Kreislaufs verbleiben. Dadurch kann sehr leicht biozides Wachstum entstehen, was den Einsatz von Bioziden notwendig macht. Biozide haben bei zu großem Einsatz allerdings den Nachteil, dass sie den Papierherstellungsprozess verschlechtern und es müssen zusätzliche Chemikalien eingesetzt werden, um den Papierherstellungsprozess stabil zu halten. In the production of pulp suspension from waste paper, however, there is regularly an anaerobic growth in stock preparation and constant part, especially when it comes to machine downtime. In addition, substances accumulate and / or regularly accumulate in the constant part, whereby they remain in subregions of the circuit for a very long time. This can easily cause biocidal growth, which makes the use of biocides necessary. However, biocides, when used too much, have the disadvantage that they degrade the papermaking process and additional chemicals must be used to keep the papermaking process stable.
Zur Zwischenlagerung, Bevorratung und/oder der Bereitstellung der Faserstoffsuspension sind verschiedenen Bütten vorgesehen. In der Regel sind mehrere Bütten hintereinander angeordnet, in denen der Faserstoff in unterschiedlichen Konzentrationen und Mengen gelagert, gemischt und/oder behandelt wird. Insbesondere in Bütten mit einer großen Bevorratungszeit (1 - 10 Stunden) kommt es bei Stillständen zu anaeroben Zuständen. Abgesehen davon, dass dieses anaerobe Wachstum in den Bütten dazu führt, dass sich das fertige Produkt verfärbt und schlecht riecht, erhöht sich die Wahrscheinlichkeit eines Bahnrisses um ein vielfaches. Weiterhin führt der erhöhte Chemikalieneinsatz auch zu einer ungewollt hohen Konzentration von Chemikalien im Konstantteil, da ja nicht alle Chemikalien mit dem fertigen Papier aus dem Stoffkreislauf ausgetragen werden. For intermediate storage, storage and / or the provision of the pulp suspension various laid paper are provided. In general, several laid paper are arranged one behind the other, in which the pulp is stored, mixed and / or treated in different concentrations and quantities. Especially in laid paper with a large storage time (1-10 hours), an anaerobic condition occurs during standstill. Apart from the fact that this anaerobic growth in the laid paper causes the finished product to discolor and smells bad, the probability of a web break increases many times over. Furthermore, the increased use of chemicals also leads to an undesirably high concentration of chemicals in the constant part, since not all chemicals are discharged from the material cycle with the finished paper.
Eine wesentliche Aufgabe der Erfindung ist es, ein verbessertes, aber zumindest alternatives, Büttenbetriebsverfahren / Büttenmanagement vorzuschlagen, das sich insbesondere durch einen stabileren Betrieb auszeichnet. An essential object of the invention is to propose an improved, but at least alternative, batch operation / batch management, which is characterized in particular by a more stable operation.
Die Aufgabe wird mittels eines Büttenbetriebsverfahren mit den Merkmalen des Anspruches 1 und einer Vorrichtung nach Anspruch 14 gelöst. The object is achieved by means of a Büttenbetriebsverfahren with the features of claim 1 and an apparatus according to claim 14.
Erfindungsgemäß wird ein Betriebsverfahren für eine Stoffaufbereitung der eingangs genannten Art vorgeschlagen, das eine Mess-/Steuer-/Regelungs- Vorrichtung umfasst, wobei mittels der Mess-/Steuer-/Regelungs-Vorrichtung zumindest ein Eigenschafts-Parameter der Faserstoffsuspension ermittelt wird, und mittels der Mess-/Steuer-/Regelungs-Vorrichtung zumindest ein Aufbereitungs- Parameter der Faserstoffsuspension derart angepasst wird, dass zumindest ein Qualitäts-Parameter der Faserstoffsuspension in zumindest einer Bütte innerhalb eines vorbestimmten Intervalls verbleibt, wenn ein Schwellwert zumindest eines Eigenschafts-Parameters erreicht, unterschritten oder überschritten wird. According to the invention, an operating method for a stock preparation of the type mentioned at the outset is proposed, which has a measurement / control / regulation Device, wherein by means of the measuring / control / regulating device at least one property parameter of the pulp suspension is determined, and by means of the measuring / control / regulating device, at least one conditioning parameter of the pulp suspension is adjusted such that at least a quality parameter of the pulp suspension remains in at least one chest within a predetermined interval when a threshold value of at least one property parameter is reached, undershot or exceeded.
Unter einem Betriebsverfahren oder auch Büttenmanagement wird ein Verfahren verstanden, wie die mindestens eine Bütte gesteuert oder geregelt werden kann, um immer einen ausreichenden Vorrat an Faserstoffsuspension mit für die Faser- stoffbahnherstellung geeigneten Qualitäts-Parametern bereitzustellen. An operating method or also batch management is understood to mean a method by which the at least one chest can be controlled or regulated in order to always provide a sufficient stock of pulp suspension with quality parameters suitable for fiber web production.
Hierfür geeignete Eigenschafts-Parameter sind vorzugsweise Parameter, die aus folgender Gruppe von Eigenschafts-Parametern ausgewählt werden können: ein physikalischer Parameter, wie beispielsweise Temperatur, Füllhöhe der Bütte, Trübung der Faserstoffsuspension oder Durchmischungsgrad ein chemischer Parameter, wie beispielsweise PH-Wert, Gaskonzentrationen, usw. ein biologischer Parameter, wie beispielsweise das Vorhandensein bestimmter Einzeller, wie Bakterien oder Pilzsporen - ein biochemischer Parameter, wie beispielsweise Abscheidungsstoffe von Bakterien oder Pilzen, die in der Faserstoffsuspension wachsen. Property parameters suitable for this purpose are preferably parameters which can be selected from the following group of property parameters: a physical parameter, such as temperature, bin fill level, suspension of the pulp suspension or degree of mixing, a chemical parameter, such as pH, gas concentrations, etc. a biological parameter, such as the presence of certain protozoa, such as bacteria or fungal spores - a biochemical parameter, such as bacteria or fungus precipitants, that grow in the pulp suspension.
Als Eigenschafts-Parameter eignet sich insbesondere die Messung einer Sauer- stoffsättigung in der Faserstoffsuspension mittels der Mess-/Steuer-/Regelungs- Vorrichtung. Aber auch das Redoxpotenzial kann als aussagefähiger Eigenschafts- Parameter bzw. Messgröße herangezogen werden. In particular, the measurement of an oxygen saturation in the pulp suspension by means of the measuring / control / regulating device is suitable as a property parameter. However, the redox potential can also be used as a meaningful property parameter or measurand.
Des Weiteren kann aber auch der PH-Wert oder die Temperatur in der Faser- stoffsuspension gemessen werden. Furthermore, it is also possible to measure the pH or the temperature in the pulp suspension.
Der bzw. die gewählten Eigenschafts-Parameter können innerhalb der Stoffaufbe- reitung an den unterschiedlichsten Stellen gemessen werden, insbesondere am Eingang / in und/oder am Ausgang der Bütte. The selected property parameter (s) can be selected within the stock be measured at various points, in particular at the entrance / in and / or at the exit of the Bütte.
Mittels der Mess-/Steuer-/Regelungs-Vorrichtung kann erfindungsgemäß zumindest einer der Aufbereitungs-Parameter, ausgewählt aus folgender Gruppe, geändert werden: ein Füllstand in der Bütte, insbesondere dann sinnvoll, wenn der Bioziedbefall sehr groß ist, wobei der Füllstand dann vorzugsweise abgesenkt wird, um die befallene Suspensionsmenge zu reduzieren. eine Durchmischung der Faserstoffsuspension, wenn sich, insbesondere in einer Bütte, ein toter Bereich gebildet hat. eine Zusammensetzung der Faserstoffsuspension. According to the invention, at least one of the preparation parameters, selected from the following group, can be changed by means of the measuring / control / regulating device: a filling level in the chest, in particular if the biocide infestation is very large, the level then preferably being is lowered to reduce the amount of infested suspension. a thorough mixing of the pulp suspension, if, in particular in a Bütte, a dead area has formed. a composition of the pulp suspension.
Die Zusammensetzung der Fasersuspension kann auf verschiedene Art und Weise geändert werden, so können Biozide und/oder andere Zusatzstoffe in die Faser- stoffsuspension beigemischt werden. Insbesondere kann die Durchmischung der Fasersuspension dadurch geändert werden, dass die Strömung in der Bütte bei Veränderung zumindest eines Qualitäts- Parameters der Faserstoffsuspension verändert wird. Dies wird in einer bevorzugten weise dadurch erreicht, dass die Strömung in der Bütte mittels eines Rührwerks verändert wird. Dies kann beispielsweise mittels eines zusätzlich installierten Rührwerks oder mittels Lufteinschnüffelung erfolgen. The composition of the fiber suspension can be changed in various ways, so biocides and / or other additives can be mixed into the pulp suspension. In particular, the mixing of the fiber suspension can be changed by changing the flow in the chest when changing at least one quality parameter of the pulp suspension. This is achieved in a preferred manner in that the flow in the chest is changed by means of a stirrer. This can be done for example by means of an additionally installed agitator or by Lufteinschnüffelung.
Weiterhin wird die Aufgabe mittels einer Vorrichtung gelöst, wobei diese zumindest eine Bütte zur Aufbereitung und Bevorratung einer Faserstoffsuspension und eine Mess-/Steuer-/Regelungs-Vorrichtung umfasst, wobei mittels der Mess-/Steuer- /Regelungs-Vorrichtung zumindest ein Eigenschafts-Parameter der Faserstoffsus- pension ermittelbar ist, und mittels der Mess-/Steuer-/Regelungs-Vorrichtung zumindest ein Aufbereitungs-Parameter der Faserstoffsuspension derart anpassbar ist, dass zumindest ein Qualitäts-Parameter der Faserstoffsuspension in zumindest einer Bütte innerhalb eines vorbestimmten Intervalls verbleibt, wenn ein Schwellwert zumindest eines Eigenschafts-Parameters erreicht, unterschritten oder überschritten wird. Furthermore, the object is achieved by means of a device, wherein this comprises at least one chute for the preparation and storage of a pulp suspension and a measuring / control / regulating device, wherein by means of the measuring / control / regulating device at least one property parameter the Faserstoffsus- pension can be determined, and by means of the measuring / control / regulating device, at least one conditioning parameter of the pulp suspension is adaptable such that at least one quality parameter of the pulp suspension remains in at least one Bütte within a predetermined interval, if a Threshold of at least one property parameter reached, undercut or exceeded becomes.
Die Mess-/Steuer-/Regelungs-Vorrichtung besteht aus mindestens einer Messstelle, einer Anpassungsvorrichtung zur Änderung der Qualität-Parameter der Suspension sowie einer Auswerteinheit bzw. Steuerungs- oder Regelungseinrichtung. In einer bevorzugten Ausführung ist die Anpassungsvorrichtung eine Dosier-, Rühr- und/oder Einblasvorrichtung. The measuring / control / regulating device consists of at least one measuring point, a matching device for changing the quality parameters of the suspension and an evaluation unit or control or regulating device. In a preferred embodiment, the adaptation device is a metering, stirring and / or blowing device.
Durch diese Art des Büttenmanagements wird in vorteilhafter Weise erreicht, dass bei einem bioziden Befall an einer Stelle des Stoffaufbereitungsprozesses sich dieser nicht unnötig weit in den nachfolgenden Bütten oder der Maschine ausbreitet oder große Mengen an Faserstoff entsorgt werden müssen. By this type of Büttenmanagements is achieved in an advantageous manner that in a biocidal infestation at one point of the stock preparation process, this does not spread unnecessarily far in the following documents or the machine or large amounts of fiber must be disposed of.
Des Weiteren kann der Biozideinsatz vorteilhaft reduziert werden. Furthermore, the biocide use can be advantageously reduced.
Weitere Merkmale der erfindungsgemäßen Vorrichtung und weitere Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele unter Bezugnahme auf die Zeichnung. Nachfolgend wird die Erfindung anhand einer in Figur 1 schematisch dargestellten Stoffaufbereitung näher erläutert. Further features of the device according to the invention and further advantages of the invention will become apparent from the following description of preferred embodiments with reference to the drawings. The invention will be explained in more detail below with reference to a stock preparation shown schematically in FIG.
Figur 1 zeigt die wesentlichen Komponenten der Altpapierstoffaufbereitung einer Papiermaschine. In der Sammelbütte 2 wird das Altpapier zu einem gleichmäßigen Faserstoffbrei aufgelöst, wobei das hierfür notwendige Wasser ganz oder teilweise von der Maschine kommt. Die Sammelbütte(n) 2 sind derart ausgelegt, dass in ihr Faserstoffbrei für ca. 1 -10 Stunden Betriebszeit der Papiermaschine bevorratet werden kann bzw. dass es 1 bis 10 Stunden dauert, bis der Faserstoffbrei einmal ausgetauscht ist. FIG. 1 shows the essential components of the wastepaper stock preparation of a paper machine. In the collection 2, the waste paper is dissolved into a uniform pulp, the necessary water comes wholly or partly from the machine. The collection bin (s) 2 are designed so that it can be stored in their pulp for about 1 -10 hours of operation of the paper machine or that it takes 1 to 10 hours to the pulp once replaced.
Von der Sammelbütte 2 wird der Faserstoffbrei in den Pulper 3 gepumpt. Unter einem Pulper versteht man einen großen Rührbottich, der in der Industrie bei der Herstellung von Papier-, Karton- oder Tissuebahnen genutzt wird, um den Faser- stoffbrei weiter aufzulösen. From the collecting bin 2, the pulp is pumped into the pulper 3. A pulper is understood as meaning a large mixing vat used in industry in the production of paper, board or tissue webs in order to further dissolve the pulp.
Dieser funktioniert wie ein übergroßer Mixer. Das Volumen des Pulpers 3 liegt zwischen 12 und 100 m3. Inn Pulper 3 wird der Faserstoffbrei unter Zugabe von Prozesswasser weiter aufgelöst und verdünnt. Die Stoffdichte der entstehenden Faserstoffsuspension im Pulper 3 beträgt ca. 10 bis 18%. This works like an oversized mixer. The volume of the pulper 3 is between 12 and 100 m 3 . Inn Pulper 3, the pulp is further dissolved and diluted with the addition of process water. The consistency of the resulting pulp suspension in the pulper 3 is about 10 to 18%.
Bei der Verarbeitung von Altpapier werden regelmäßig auch Störstoffe in den Prozess eingetragen. Störstoffe, wie Abfall, Metalldrähte, Sand, usw., die nicht bereits vorher entfernt werden können, wie z.B. Sand, werden anschließend mittels eines Schwerteilcleaners 5 aussortiert. Störstoffe, die durch das Siebblech des Schwerteilcleaners 5 nicht ausgefiltert werden können, können noch in nachfolgenden feineren Sortierungen, Vorsortieren, entfernt werden. Die gereinigte Faserstoffsuspension wird anschließend in die Pulper-Ableerbütte 6, die eine Vorratsmenge von ebenfalls ca. 1 - 10 Stunden bevorraten kann, gepumpt. Bevor die Faserstoffsuspension in den Prozesswasserkreislauf gelangt, wird in einer Vorsortierung 7 der Faseranteil aussortiert, der nicht für die Papierherstellung geeignet ist. In der sich anschließenden Pufferbütte 8, die einen Vorrat für 3-6 Stunden bevorratet, wird die Faserstoffsuspension zwischengelagert, bevor sie dem Prozesswasser des Konstantteils zugeführt wird. Dies geschieht in einer Mischvorrichtung, in der die Faserstoffsuspension mit Prozesswasser zu einer Faserstoffsuspension mit ca. 3 bis 6% Feststoffanteil verdünnt wird. Die Mischvorrichtung kann auch dazu genutzt werden andere Anteile von Faserstoffen und Feststoffen der Faserstoffsuspension beizumischen. When processing waste paper, contaminants are regularly added to the process. Contaminants, such as garbage, metal wires, sand, etc., which can not be removed beforehand, e.g. Sand, are then sorted out by means of a Schwerteilcleaners 5. Contaminants that can not be filtered out by the screen plate of Schwerteilcleaners 5 can still be removed in subsequent finer grades, pre-sorting. The purified pulp suspension is then pumped into the pulper Ableerbütte 6, which can stockpile a supply of also about 1-10 hours. Before the pulp suspension enters the process water cycle, the fiber fraction which is not suitable for papermaking is sorted out in a presorting 7. In the adjoining buffer chest 8, which stores a supply for 3-6 hours, the pulp suspension is stored intermediately before it is fed to the process water of the constant part. This is done in a mixing device in which the pulp suspension is diluted with process water to a pulp suspension with about 3 to 6% solids. The mixing device can also be used to mix other proportions of pulps and solids of the pulp suspension.
Diese Mischung gelangt anschließend in die Mischbütte 9, wo sie weiter durchmischt und von der sie anschließend in die Maschinenbütte 10 gepumpt wird. Die Maschinenbütte 10 ist die letzte Bütte vor dem Stoffauflauf. Sie gehört maschinen- technisch bereits zum Konstantteil 14 der Papiermaschine. Um einen konstanten Suspensionsdruck im Konstantteil zu gewährleisten, muss immer mindestens so viel Faserstoffsuspension aus der Mischbütte in die Maschinenbütte gepumpt werden, dass diese ein konstantes Büttenfüllniveau aufweist. Dies wird erreicht, indem von der Mischbütte ständig mehr Fasersuspension in die Maschinenbütte gepumpt wird, als aus der Maschinenbütte 10 entnommen wird. Der überschüssige Anteil gelangt über einen Überlauf zurück in die Mischbütte, sodass zum einen der Füllstand immer konstant gehalten wird und der Inhalt der Maschinenbütte ständig in Bewegung bleibt, sodass immer eine gleichmäßige Faserstoffsuspension unter konstanten Druckbedingungen vorliegt. In einigen, nicht Dargestellten, nach geschalteten Verdünnungsstufen erfolgt eine weitere Verdünnung der Faserstoffsuspension, bevor diese letztendlich über die Stoffauflaufdüse auf die Maschine gelangt. This mixture then passes into the mixing chest 9, where it further mixed and from which it is then pumped into the machine chest 10. The machine chest 10 is the last chest before the headbox. It already belongs to the constant part 14 of the paper machine. In order to ensure a constant suspension pressure in the constant part, it is always necessary to pump at least as much pulp suspension from the mixing chest into the machine chest that it has a constant level of fill level. This is achieved by constantly pumping more fiber suspension into the machine chest from the mixing chest, as is removed from the machine chest 10. The excess portion passes through an overflow back into the mixing tank, so on the one hand, the level is always kept constant and the contents of the machine chest constantly in motion, so there is always a uniform pulp suspension under constant pressure conditions. In some, not shown, downstream of the dilution stages, a further dilution of the pulp suspension before it finally reaches the machine via the headbox.
Um kritische anaerobe Zustände schon in der Entstehungsfase zu erkennen, sind Messgeräte vorgesehen, mittels derer die Entstehung von anaeroben Zuständen erkannt werden kann. Dies können Sauerstoffmessgeräte, Redoxpotenzialmessge- räte, ph-Messgeräte und/oder Temperaturmessgeräte sein. Die Messung erfolgt entweder direkt in der Bütte, bzw. innerhalb der Bütte, oder in der Zu- oder Ableitung der Bütten. In order to detect critical anaerobic conditions already in the formation phase, measuring devices are provided by means of which the formation of anaerobic states can be recognized. These can be oxygen measuring devices, redox potential measuring devices, pH measuring devices and / or temperature measuring devices. The measurement takes place either directly in the chest, or inside the chest, or in the feed or discharge of the laid paper.
Der oder die gemessenen Eigenschafts-Parameter der Faserstoffsuspension werden in der Mess-/Steuer-/Regelungs-Vorrichtung verarbeitet und mittels der Mess-/Steuer-/Regelungs-Vorrichtung wird zumindest ein Aufbereitungs-Parameter der Faserstoffsuspension derart angepasst, dass zumindest ein Qualitäts- Parameter der Faserstoffsuspension in zumindest einer Bütte innerhalb eines vorbestimmten Intervalls verbleibt, wenn ein Schwellwert zumindest eines Eigenschafts-Parameters erreicht, unterschritten oder überschritten wird. The measured property parameter (s) of the pulp suspension are processed in the measuring / control / regulating device and by means of the measuring / control / regulating device at least one conditioning parameter of the pulp suspension is adapted in such a way that at least one quality parameter Parameter of the pulp suspension remains in at least one chest within a predetermined interval, when a threshold value of at least one property parameter is reached, exceeded or exceeded.
Mittels der Einzelmessungen oder durch Kombination mehrerer Messungen wird die Situation beurteilt. Sobald ein Zustand erreicht wird der die Gefahr eines übermäßigen Wachstums bzw. der Verschlimmerung eines anaeroben Zustandes andeutet kann so einer weiteren Verschlimmerung gegengesteuert werden. Zur Gegensteuerung bzw. zum Stoppen des anaeroben Wachstums stehen verschiedene Eingriffsmöglichkeiten zur Verfügung mittels denen die Aufbereitungs-Parameter geändert werden können. The situation is assessed by means of individual measurements or by combining several measurements. As soon as a condition is reached which indicates the danger of an excessive growth or the aggravation of an anaerobic condition, a further aggravation can be counteracted. For counteracting or stopping the anaerobic growth, various intervention options are available by means of which the conditioning parameters can be changed.
Eine einfache und effektive Art das Wachstum zu stoppen ist das entleeren der betroffenen Bütte sowie der sich an diese Bütte anschließenden Bütten. So wird verhindert, dass neuer Stoff direkt wieder befallen wird. Da dies in der Regel aber nicht so einfach möglich ist, insbesondere in der Maschinenbütte überhaupt nicht möglich ist, wird das Büttenniveau nur abgesenkt und mittels einer Dosiervorrich- tung die Bioziddosierung in die Stoffaufbereitung verändert. A simple and effective way to stop growth is to empty the affected tub as well as the laid paper adjacent to this tub. This prevents new material from being directly re-infested. Since this is usually not so easy, especially in the machine chest is not possible at all, the quality level is only lowered and by means of a Dosiervorrich- changed the biocide dosage to stock preparation.
Die Biozide können an den verschiedensten Stellen in den Wasserkreislauf eindosiert werden. Vorteilhaft ist die Eindosierung vor und/oder direkt in die betroffenen Bütten mittels einer Dosiervorrichtung. Die Zudosierung der Biozide kann gering gehalten werden, wenn die Menge der befallenen Suspension gering ist und der Füllstand niedrig ist. The biocides can be metered into the water cycle at various points. Advantageously, the metering before and / or directly in the affected paper by means of a metering device. The metered addition of the biocides can be kept low if the amount of the affected suspension is low and the level is low.
Vorteilhafterweise wird die Stoffaufbereitung derart betrieben, dass bei geringsten Anzeichen von biozidem Wachstum der Füllstand der betroffenen und der nachfolgenden Bütten abgesenkt wird und parallel dazu die Biozidzufuhr erhöht wird und erst wenn das biozide Wachstum gestoppt ist, der Füllstand wieder vergrößert wird. Advantageously, the stock preparation is operated such that the lowest level of biocidal growth, the level of the affected and the subsequent laid paper is lowered and parallel to the biocide is increased and only when the biocidal growth is stopped, the level is increased again.
Weiterhin können Umwälzvorrichtungen vorgesehen werden, die die Umwälzung innerhalb einer Bütte durch gezieltes Verändern der Strömung in der Bütte derart ändern, dass die Entstehungsherde von anaeroben Wachstumsherden, die meist in Totzonen entstehen, aus diesen herausbewegt werden. Dazu kann beispielsweise die Drehzahl der Mischvorrichtung in den Mischbütten geändert werden oder eine zusätzliche Mischvorrichtung, wie z.B. eine Lufteinschnüffelung, vorgesehen werden. Furthermore, recirculation devices can be provided which change the circulation within a chest by deliberately changing the flow in the chest such that the sources of production of anaerobic growth herds, which usually arise in dead zones, are moved out of these. For this purpose, for example, the speed of the mixing device can be changed in the Mischbütten or an additional mixing device, such as a Lufteinschnüffelung be provided.
Bezuqszeichenliste LIST OF REFERENCES
StoffaufbereitungStock preparation
Sammelbütte Sammelbütte
Pulper  pulper
Pumpe  pump
Schwerteilcleaner Heavyweight cleaning
Ableerbütte dump chest
Vorsortierer  presorter
Pufferbütte  Pufferbütte
Mischbütte  mixing vat
Maschinenbüttea-e Suspensionszulaufleitungen  Machine bulk slurry feed lines
Suspensionsablaufleitunga-f Dosierstellen  Suspension drain line a-f Dosing points
Nassfestm ittelzugabe Wet strength additive
Konstantteil constant part

Claims

Patentansprüche claims
1 . Betriebsverfahren für eine Stoffaufbereitung (1 ) einer Papier-, Tissue- oder Kartonmaschine zur Herstellung einer Faserstoffbahn, umfassend zumindest eine Bütte (2) zur Aufbereitung und Bevorratung einer Faserstoffsuspension und eine Mess-/Steuer-/Regelungs-Vorrichtung, wobei mittels der Mess- /Steuer-/Regelungs-Vorrichtung zumindest ein Eigenschafts-Parameter der Faserstoffsuspension ermittelt wird, und mittels der Mess-/Steuer- /Regelungs-Vorrichtung zumindest ein Aufbereitungs-Parameter der Faser- stoffsuspension derart angepasst wird, dass zumindest ein Qualitäts- Parameter der Faserstoffsuspension in zumindest einer Bütte innerhalb eines vorbestimmten Intervalls verbleibt, wenn ein Schwellwert zumindest eines Eigenschafts-Parameters erreicht, unterschritten oder überschritten wird. 1 . Operating method for a stock preparation (1) of a paper, tissue or board machine for producing a fibrous web, comprising at least one chest (2) for the preparation and storage of a pulp suspension and a measuring / control / regulating device, wherein by means of the measuring At least one property parameter of the pulp suspension is determined, and by means of the measuring / control / regulating device at least one reprocessing parameter of the pulp suspension is adapted such that at least one quality parameter of the pulp suspension remains in at least one chest within a predetermined interval when a threshold value of at least one property parameter is reached, undershot or exceeded.
2. Verfahren nach Anspruch 1 , 2. The method according to claim 1,
dadurch gekennzeichnet,  characterized,
dass zumindest ein Eigenschafts-Parameter ausgewählt ist aus einer der folgenden Gruppen:  that at least one property parameter is selected from one of the following groups:
- ein physikalischer Parameter  - a physical parameter
- ein chemischer Parameter  - a chemical parameter
- ein biologischer Parameter  - a biological parameter
- ein biochemischer Parameter.  - a biochemical parameter.
3. Verfahren nach Anspruch 2 3. The method according to claim 2
dadurch gekennzeichnet,  characterized,
dass eine Sauerstoffsättigung gemessen wird.  that an oxygen saturation is measured.
4. Verfahren nach Anspruch 2, 4. The method according to claim 2,
dadurch gekennzeichnet,  characterized,
dass ein Redoxpotenzial gemessen wird. that a redox potential is measured.
5. Verfahren nach Anspruch 2, 5. The method according to claim 2,
dadurch gekennzeichnet,  characterized,
dass ein PH-Wert gemessen wird.  that a PH value is measured.
6. Verfahren nach Anspruch 2, 6. The method according to claim 2,
dadurch gekennzeichnet,  characterized,
dass die Temperatur gemessen wird.  that the temperature is measured.
7. Verfahren nach Anspruch 2, 7. The method according to claim 2,
dadurch gekennzeichnet,  characterized,
dass zumindest ein Eigenschafts-Parameter am Eingang/in und/oder am Ausgang der Bütte gemessen wird.  that at least one property parameter is measured at the entrance / in and / or at the exit of the chest.
8. Verfahren nach Anspruch 1 , 8. The method according to claim 1,
dadurch gekennzeichnet,  characterized,
dass zumindest einer der Aufbereitungs-Parameter ausgewählt ist aus der folgenden Gruppe,  at least one of the conditioning parameters is selected from the following group,
- ein Füllstand in zumindest einer Bütte  - A level in at least one chest
- eine Durchmischung der Faserstoffsuspension  - a thorough mixing of the pulp suspension
- eine Zusammensetzung der Faserstoffsuspension  a composition of the pulp suspension
geändert wird.  will be changed.
9. Verfahren nach Anspruch 8, 9. The method according to claim 8,
dadurch gekennzeichnet,  characterized,
dass der Füllstand zumindest einer Bütte bei Veränderung zumindest eines Eigenschafts-Parameters der Faserstoffsuspension abgesenkt wird.  that the level of at least one Bütte is lowered when changing at least one property parameter of the pulp suspension.
10. Verfahren nach Anspruch 8, 10. The method according to claim 8,
dadurch gekennzeichnet,  characterized,
dass eine Strömung in zumindest einer Bütte bei Veränderung zumindest eines Qualitäts-Parameters der Faserstoffsuspension verändert wird. that a flow in at least one chest is changed when changing at least one quality parameter of the pulp suspension.
1 1 . Verfahren nach Anspruch 10, 1 1. Method according to claim 10,
dadurch gekennzeichnet,  characterized,
dass die Strömung in der mindestens einen Bütte mittels eines Rührwerks verändert wird.  that the flow in the at least one chest is changed by means of a stirrer.
12. Verfahren nach Anspruch 10, 12. The method according to claim 10,
dadurch gekennzeichnet,  characterized,
dass die Strömung in der mindestens einen Bütte mittels Lufteinschnuffelung verändert wird.  that the flow in the at least one chest is changed by means of air intake.
13. Verfahren nach Anspruch 8, 13. The method according to claim 8,
dadurch gekennzeichnet,  characterized,
dass mittels einer Dosiervorrichtung ein Biozid und/oder ein Zusatzmittel beigemischt wird.  in that a biocide and / or an admixture is admixed by means of a metering device.
14. Vorrichtung für eine Stoffaufbereitung einer Papier-, Tissue- oder Kartonmaschine zur Herstellung einer Faserstoffbahn, umfassend zumindest eine Bütte zur Aufbereitung und Bevorratung einer Faserstoffsuspension und eine Mess-/Steuer-/Regelungs-Vorrichtung, wobei mittels der Mess-/Steuer- /Regelungs-Vorrichtung zumindest ein Eigenschafts-Parameter der Faser- stoffsuspension ermittelbar ist, und mittels der Mess-/Steuer-/Regelungs- Vorrichtung zumindest ein Aufbereitungs-Parameter der Faserstoffsuspensi- on derart anpassbar ist, dass zumindest ein Qualitäts-Parameter der Faser- stoffsuspension in zumindest einer Bütte innerhalb eines vorbestimmten Intervalls verbleibt, wenn ein Schwellwert zumindest eines Eigenschafts- Parameters erreicht, unterschritten oder überschritten wird. 14. A device for a stock preparation of a paper, tissue or board machine for producing a fibrous web, comprising at least one chest for the preparation and storage of a pulp suspension and a measuring / control / regulating device, wherein by means of the measuring / control / Control device at least one property parameter of the pulp suspension is determined, and by means of the measuring / control / regulating device, at least one conditioning parameter of the pulp suspension is adaptable such that at least one quality parameter of the pulp suspension remains in at least one chest within a predetermined interval when a threshold value of at least one property parameter is reached, undershot or exceeded.
15. Vorrichtung nach Anspruch 14, 15. Device according to claim 14,
dadurch gekennzeichnet, dass die Mess-/Steuer-/Regelungs-Vorrichtung aus mindestens einer Messstelle einer Vorrichtung zur Änderung der Qualitäts-Parameter der Suspension sowie einer Auswerteinheit bzw. Steuerungs- oder Regelungseinrichtung und einer Anpassungsvorrichtung besteht. characterized, that the measuring / control / regulating device consists of at least one measuring point of a device for changing the quality parameters of the suspension and an evaluation unit or control or regulating device and a matching device.
Vorrichtung nach Anspruch 15, Device according to claim 15,
dadurch gekennzeichnet,  characterized,
dass die Anpassungsvorrichtung eine Dosier-, Rühr- und/oder Einblasvorrichtung ist. in that the adaptation device is a metering, stirring and / or blowing device.
EP12766412.6A 2011-09-29 2012-09-19 Operating method for a stock preparation zone Revoked EP2761080B1 (en)

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