EP1944410A1 - Method for transporting a fibrous suspension - Google Patents

Method for transporting a fibrous suspension Download PDF

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Publication number
EP1944410A1
EP1944410A1 EP07118786A EP07118786A EP1944410A1 EP 1944410 A1 EP1944410 A1 EP 1944410A1 EP 07118786 A EP07118786 A EP 07118786A EP 07118786 A EP07118786 A EP 07118786A EP 1944410 A1 EP1944410 A1 EP 1944410A1
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EP
European Patent Office
Prior art keywords
pressure
partial flow
pulp suspension
turbine
fuel pump
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Granted
Application number
EP07118786A
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German (de)
French (fr)
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EP1944410B1 (en
Inventor
Johannes Ecker
Stefan Hartmann
Erwin Binder
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP1944410A1 publication Critical patent/EP1944410A1/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
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • Such processes serve to guide the pulp suspension required for paper production through a closed system, in particular through pipelines and apparatus. It may also be necessary to reduce the pressure at certain points of the system used.
  • throttling acting control elements are used to adjust pressures and the flow rate to meet the requirements of the system accordingly.
  • Such methods are conceivable in the stock preparation of a paper mill and in particular in the so-called constant part, ie the part of the plant, which is connected directly upstream of the headbox. It is hitherto accepted that the pressure energy at the throttle point is converted into mostly useless heat.
  • problems can occur if pressure pulsations arise in the pulp suspension. These can, if they reach the headbox, interfere with their operation and thus permanently impair the quality of the product (paper or cardboard) produced.
  • One cause is in the actuators that are required to change the flow rate of the pulp suspension or their pressure.
  • Such actuators are usually adjustable slides or valves.
  • the invention is based on the object, a method of o.g. To create a way to avoid the mentioned disadvantages.
  • Suitable turbines are used almost exclusively to generate electric current from flowing pressurized water by means of a connected generator.
  • they are driven in a paper mill with a pulp suspension, namely where, for process engineering reasons, a reduction in the pressure of the pulp offered or at least harmless.
  • a pulp suspension S is produced in the usual way by mixing a thick stock suspension 4 with a diluting liquid and thereafter has substantially the desired consistency for the operation of the headbox 1 of the paper or board machine 2 at this point.
  • headbox consistencies range between 0.5 and 2%, usually around 1%.
  • the dilution liquid which is supplied at a mixing point 3 originates in the example shown here predominantly from the first white water 15, that is, the water accumulated in the forming area of the paper or board machine 2. It is often referred to as white water I (SWI) in contrast to the later occurring on the paper machine white water, which contains much less fines.
  • a further fuel pump 10 can be installed between accept line 18 of the cleaner system 13 and inlet to the sorting system 11 for pressure increase.
  • the effort that must be done for these hydrocyclones and sorters will depend on the raw materials as well as the quality requirements of the paper produced. If, for example, the Dickstoffsuspension 4 was formed from waste paper, sand and small plastic parts may be present.
  • the fuel pump 10 may be designed so that gas is sucked off in its central inlet region.
  • this subset 19 is passed into a turbine 5, in which the pressure is reduced.
  • This mechanical power is applied, which is connected in the example shown here via a clutch or a gearbox 8 with the fuel pump 10.
  • the turbine can be provided with adjustable guide vanes.
  • An easy to implement possibility is also the conversion into electricity by means of a generator.
  • the plant example shows yet another possibility for the application of the inventive concept, namely, where at the pressure sorter 12, a partial stream 20 is led out as a reject.
  • the reject flow of a pressure sorter is formed by a partial flow which has not passed through the sieve.
  • the pressure of this partial flow 20 is also very high, possibly even higher than in the headbox 1 can be.
  • a turbine 6 can again recover the mechanical power resulting from the pressure reduction.
  • the turbine 6 is connected to a generator 7 for generating electricity.

Abstract

The method involves delivering a fibrous suspension (S) using material pumps (9, 10) by pressure increased for a process step. A part of the fibrous suspension subjected to increased pressure is derived as branch currents (19, 20) and is reduced to another pressure that is suitable for another process step. The latter pressure is reduced by turbines (5, 6), which uses mechanical power output that occurs during the pressure reduction. The mechanical power output is converted into electric current and is used for mechanical operation of rotors of the pumps.

Description

Die Erfindung betrifft ein Verfahren gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a method according to the preamble of claim 1.

Derartige Verfahren dienen dazu, die zur Papiererzeugung benötigte Faserstoffsuspension durch ein geschlossenes System, insbesondere durch Rohrleitungen und Apparate zu führen. Dabei kann es auch erforderlich sein, an bestimmten Stellen der verwendeten Anlage den Druck zu reduzieren. Üblicherweise werden drosselnd wirkende Regelorgane eingesetzt, um Drücke und die Durchströmmenge den Anforderungen des Systems entsprechend einstellen zu können. Solche Verfahren sind denkbar in der Stoffaufbereitung einer Papierfabrik und insbesondere im sogenannten Konstanten Teil, also dem Anlagenteil, der unmittelbar dem Stoffauflauf vorgeschaltet ist. Dabei wird bisher in Kauf genommen, dass die Druckenergie an der Drosselstelle in zumeist nutzlose Wärme umgewandelt wird. Außerdem können Probleme auftreten, wenn in der Faserstoffsuspension Druckpulsationen entstehen. Diese können, wenn sie bis in den Stoffauflauf gelangen, dessen Betrieb empfindlich stören und damit die Qualität des erzeugten Produktes (Papier oder Karton) nachhaltig beeinträchtigen. Eine Ursache liegt in den Stellorganen, die erforderlich sind, um die Durchflussmenge der Faserstoffsuspension bzw. deren Druck zu verändern. Solche Stellorgane sind üblicherweise verstellbare Schieber oder Ventile.Such processes serve to guide the pulp suspension required for paper production through a closed system, in particular through pipelines and apparatus. It may also be necessary to reduce the pressure at certain points of the system used. Usually throttling acting control elements are used to adjust pressures and the flow rate to meet the requirements of the system accordingly. Such methods are conceivable in the stock preparation of a paper mill and in particular in the so-called constant part, ie the part of the plant, which is connected directly upstream of the headbox. It is hitherto accepted that the pressure energy at the throttle point is converted into mostly useless heat. In addition, problems can occur if pressure pulsations arise in the pulp suspension. These can, if they reach the headbox, interfere with their operation and thus permanently impair the quality of the product (paper or cardboard) produced. One cause is in the actuators that are required to change the flow rate of the pulp suspension or their pressure. Such actuators are usually adjustable slides or valves.

Der Erfindung liegt die Aufgabe zu Grunde, ein Verfahren der o.g. Art zu schaffen, mit dem die genannten Nachteile vermieden werden.The invention is based on the object, a method of o.g. To create a way to avoid the mentioned disadvantages.

Diese Aufgabe wird durch die im Anspruch 1 beschriebenen Merkmale gelöst.This object is achieved by the features described in claim 1.

Geeignete Turbinen werden fast ausschließlich dazu verwendet, aus fließendem unter Druck stehendem Wasser mit Hilfe eines angeschlossenen Generators elektrischen Strom zu erzeugen. Bei Anwendung der Erfindung werden sie in einer Papierfabrik mit einer Faserstoffsuspension angetrieben, und zwar dort, wo aus prozesstechnischen Gründen eine Reduzierung des Druckes des Faserstoffs geboten oder zumindest unschädlich ist.
Die Erfindung und ihre Vorteile werden erläutert an Hand einer Zeichnung, die ein Beispiel einer vorteilhaften Ausführungsform des erfindungsgemäßen Verfahrens zeigt.Suitable turbines are used almost exclusively to generate electric current from flowing pressurized water by means of a connected generator. When applying the invention, they are driven in a paper mill with a pulp suspension, namely where, for process engineering reasons, a reduction in the pressure of the pulp offered or at least harmless.
The invention and its advantages will be explained with reference to a drawing, which shows an example of an advantageous embodiment of the method according to the invention.

Gemäß dieser Figur wird eine Faserstoffsuspension S in der üblichen Weise durch Vermischung einer Dickstoffsuspension 4 mit einer Verdünnungsflüssigkeit erzeugt und hat danach im Wesentlichen die für den Betrieb des Stoffauflaufes 1 der Papier- oder Kartonmaschine 2 an dieser Stelle gewünschte Konsistenz. Bekanntlich liegen Stoffauflauf-Konsistenzen im Bereich zwischen 0,5 und 2 %, in der Regel um 1 %. Die Verdünnungsflüssigkeit, die an einer Mischstelle 3 zugeführt wird, stammt bei dem hier gezeigten Beispiel überwiegend aus dem ersten Siebwasser 15, also dem im Formierbereich der Papier- oder Kartonmaschine 2 angefallenen Wasser. Es wird oft als Siebwasser I (SWI) bezeichnet im Unterschied zum später auf der Papiermaschine anfallenden Siebwasser, das sehr viel weniger Feinstoffe enthält.According to this figure, a pulp suspension S is produced in the usual way by mixing a thick stock suspension 4 with a diluting liquid and thereafter has substantially the desired consistency for the operation of the headbox 1 of the paper or board machine 2 at this point. It is known that headbox consistencies range between 0.5 and 2%, usually around 1%. The dilution liquid which is supplied at a mixing point 3 originates in the example shown here predominantly from the first white water 15, that is, the water accumulated in the forming area of the paper or board machine 2. It is often referred to as white water I (SWI) in contrast to the later occurring on the paper machine white water, which contains much less fines.

Es ist bekannt, dass solches Siebwasser u.a. mit einem beträchtlichen Anteil von Luft und eventuell sonstigen Gasen vermischt ist. Das Siebwasser wird unterhalb des Papiermaschinen-Siebes aufgefangen und seitlich abgeleitet. In den dazu benutzten offenen Rinnen kann bereits ein großer Teil der enthaltenen Luft austreten. Dennoch ist es oft sinnvoll, weitere an sich bekannte und hier nicht gezeigte Maßnahmen zur Entlüftung zu treffen. Nach dem Vermischen von Dickstoffsuspension 4 und Verdünnungsflüssigkeit wird die Suspension über eine Stoffpumpe 9 hier in einem geschlossenen System (also ohne offene Behälter oder Bütten) bis zum Stoffauflauf 1 geführt. Dabei wird hier in der üblichen Weise der Rest an noch vorhandenen Störstoffen durch eine Cleaneranlage 13 und eine Sortieranlage 11 ausgeschieden. Um den Druck in der Cleaneranlage 13 nicht zu hoch werden zu lassen, kann zwischen Akzeptleitung 18 der Cleaneranlage 13 und Zulauf zur Sortieranlage 11 zur Druckerhöhung eine weitere Stoffpumpe 10 installiert sein. Selbstverständlich wird der Aufwand, der für diese Hydrozyklone und Sortierer betrieben werden muss, von den Rohstoffen sowie den Anforderungen an die Qualität des erzeugten Papieres abhängen. Wenn z.B. die Dickstoffsuspension 4 aus Altpapier gebildet wurde, können noch Sand und kleine Plastikteile vorhanden sein. Die Stoffpumpe 10 kann so ausgeführt sein, dass in ihrem zentralen Einlaufbereich Gas abgesaugt wird.It is known that such white water is inter alia mixed with a considerable proportion of air and possibly other gases. The white water is collected below the paper machine sieve and discharged laterally. In the open channels used for this purpose, a large part of the air contained can already escape. Nevertheless, it is often useful to take other measures known per se and not shown here for venting. After mixing thick matter suspension 4 and dilution liquid, the suspension is passed through a fuel pump 9 here in a closed system (ie without open containers or laid paper) to the headbox 1. In this case, the remainder of remaining impurities is eliminated by a cleaner system 13 and a sorting system 11 in the usual way. In order not to let the pressure in the cleaner system 13 become too high, a further fuel pump 10 can be installed between accept line 18 of the cleaner system 13 and inlet to the sorting system 11 for pressure increase. Of course, the effort that must be done for these hydrocyclones and sorters will depend on the raw materials as well as the quality requirements of the paper produced. If, for example, the Dickstoffsuspension 4 was formed from waste paper, sand and small plastic parts may be present. The fuel pump 10 may be designed so that gas is sucked off in its central inlet region.

Besonders bei modernen Stoffaufläufen wird zu deren Betrieb ein starker Überdruck benötigt, der durchaus bis 10 bar oder auch darüber liegen kann. Diese Anforderung ergibt sich daraus, dass die Suspension beim Austritt aus dem Stoffauflauf 1 durch die Düse 17 auf eine relativ hohe Geschwindigkeit gebracht werden soll und daraus, dass Turbulenz erhöhende Einbauten im und am Stoffauflauf einen signifikanten Druckverlust erzeugen können. Aus verschiedenen Gründen hat es sich herausgestellt, dass der Betrieb eines Stoffauflaufes und der damit zusammenhängenden Papier- oder Kartonmaschine den Abzug einer Teilmenge 19 aus dem Stoffauflauf erforderlich macht. Im Betriebszustand kann diese Teilmenge durchaus etwa 10 % der dem Stoffauflauf 1 zugeführten Suspensionsmenge entsprechen. Diese Teilmenge 19 steht praktisch unter demselben Druck wie in der Zuführleitung 16 zum Stoffauflauf 1. Bei Anwendung des erfindungsgemäßen Verfahrens wird diese Teilmenge 19 in eine Turbine 5 geleitet, in der der Druck abgebaut wird. Dabei fällt mechanische Leistung an, die bei dem hier gezeigten Beispiel über eine Kupplung oder ein Getriebe 8 mit der Stoffpumpe 10 verbunden ist. Um das Zusammenwirken von Pumpe und Turbine aufeinander abzustimmen, etwa bei unterschiedlichen Teilstrommengen, kann die Turbine mit verstellbaren Leitschaufeln versehen sein.Especially with modern headboxes, a strong overpressure is required for their operation, which can well be up to 10 bar or even higher. This requirement results from the fact that the suspension is to be brought to a relatively high speed through the nozzle 17 at the exit from the headbox 1 and from the fact that turbulence-increasing internals in and at the headbox can produce a significant pressure loss. For various reasons, it has been found that the operation of a headbox and the associated paper or board machine requires the withdrawal of a subset 19 from the headbox. In operation, this subset may well correspond to about 10% of the headbox 1 supplied amount of suspension. This subset 19 is practically under the same pressure as in the supply line 16 to the headbox 1. When using the method according to the invention, this subset 19 is passed into a turbine 5, in which the pressure is reduced. This mechanical power is applied, which is connected in the example shown here via a clutch or a gearbox 8 with the fuel pump 10. In order to coordinate the interaction of pump and turbine, for example with different partial flow rates, the turbine can be provided with adjustable guide vanes.

Eine leicht zu realisierende Möglichkeit ist auch die Umwandlung in elektrischen Strom mittels eines Generators.An easy to implement possibility is also the conversion into electricity by means of a generator.

Das Anlagenbeispiel zeigt noch eine weitere Möglichkeit zur Anwendung des Erfindungsgedankens, nämlich dort, wo am Drucksortierer 12 ein Teilstrom 20 als Rejekt herausgeleitet wird. Bekanntlich wird der Rejektstrom eines Drucksortierers durch einen Teilstrom gebildet, der das Sieb nicht passiert hat. An der Stelle, an der der Drucksortierer 12 in dieser Anlage eingebaut ist, führt das dazu, dass der Druck dieses Teilstroms 20 ebenfalls sehr hoch, gegebenenfalls sogar höher als im Stoffauflauf 1 sein kann. Soll dieser Teilstrom 20 (also der Rejekt) in eine Sekundärstufe, d.h. in einen weiteren Drucksortierer 18 geführt werden, so kann auch hier wiederum eine Turbine 6 die bei der Druckreduzierung anfallende mechanische Leistung zurückgewinnen. Bei dem gezeigten Beispiel ist die Turbine 6 an einen Generator 7 zur Stromerzeugung verbunden. Da in den meisten Fällen nur wenig Störstoffe in der im Konstanten Teil eingesetzten Drucksortiereranlage 11 anfallen, ist es auch möglich, dass eine einzige Stufe zur Sortierung ausreicht. Dann würde der Rejektstrom ohne weitere Sortierung abgeleitet werden, z.B. in die Abwasserrückgewinnung der Papierfabrik.The plant example shows yet another possibility for the application of the inventive concept, namely, where at the pressure sorter 12, a partial stream 20 is led out as a reject. As is known, the reject flow of a pressure sorter is formed by a partial flow which has not passed through the sieve. At the point where the pressure sorter 12 is installed in this system, this means that the pressure of this partial flow 20 is also very high, possibly even higher than in the headbox 1 can be. If this partial flow 20 (ie the reject) is to be guided into a secondary stage, ie into a further pressure sorter 18, a turbine 6 can again recover the mechanical power resulting from the pressure reduction. In the example shown, the turbine 6 is connected to a generator 7 for generating electricity. Since in most cases only a small amount of impurities is produced in the pressure sorter unit 11 used in the constant part, it is also possible for a single stage to be sufficient for sorting. Then the reject flow would be diverted without further sorting, eg into the wastewater recovery of the paper mill.

Claims (12)

Verfahren zur Förderung einer Faserstoffsuspension (S), insbesondere im Konstanten Teil vor einem Stoffauflauf (1) einer Papier- oder Kartonmaschine (2), bei dem die Faserstoffsuspension (S) mit mindestens einer Stoffpumpe (9, 10) auf einen für einen Prozessschritt benötigten erhöhten Druck gebracht wird und wobei ein Teil der unter erhöhtem Druck stehenden Faserstoffsuspension (S) als Teilstrom (19, 20) abgeleitet und auf einen für einen anderen Prozessschritt geeigneten Druck reduziert wird,
dadurch gekennzeichnet,
dass der Druck durch mindestens eine Turbine (5, 6) reduziert wird, die die bei der Druckreduzierung anfallende mechanische Leistung nutzbar macht.Method for conveying a pulp suspension (S), in particular in the constant part before a headbox (1) of a paper or board machine (2), wherein the pulp suspension (S) with at least one fuel pump (9, 10) to one for a process step required and wherein a portion of the elevated pressure pulp suspension (S) is diverted as a partial flow (19, 20) and reduced to a pressure suitable for another process step,
characterized,
that the pressure by at least one turbine (5, 6) is reduced, which makes the obtained in the pressure-reducing mechanical power available. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass die mechanische Leistung der Turbine (6) in elektrischen Strom umgewandelt wird.Method according to claim 1,
characterized,
that the mechanical power of the turbine (6) is converted into electricity. Verfahren nach Anspruch 1,
dadurch gekennzeichnet,
dass die mechanische Leistung zum mechanischen Antrieb eines Rotors genutzt wird, insbesondere des Rotors einer Pumpe.Method according to claim 1,
characterized,
that the mechanical power is used for the mechanical drive of a rotor, in particular the rotor of a pump. Verfahren nach Anspruch 3,
dadurch gekennzeichnet,
dass die durch die Turbine (5) angetriebene Pumpe die Stoffpumpe (10) ist, die die Faserstoffsuspension (S) auf den für einen Prozessschritt benötigten erhöhten Druck bringt.Method according to claim 3,
characterized,
that through the turbine (5) driven pump is the fuel pump (10), which brings the pulp suspension (S) to the required for a process step increased pressure. Verfahren nach einem der voran stehenden Ansprüche,
dadurch gekennzeichnet,
dass der Teilstrom (19) aus dem Stoffauflauf (1) abgeleitet wird.Method according to one of the preceding claims,
characterized,
that the partial flow (19) from the head box (1) is derived. Verfahren nach Anspruch 5,
dadurch gekennzeichnet,
dass der Teilstrom (19') nach der Druckreduzierung dem Siebwasser (15) der Papier- oder Kartonmaschine (2) zugemischt wird.Method according to claim 5,
characterized,
that the partial flow (19 ') after the pressure reduction to the white water (15) of the paper or board machine (2) is mixed. Verfahren nach einem der voran stehenden Ansprüche,
dadurch gekennzeichnet,
dass der Teilstrom (20) als Rejekt eines Drucksortierers (12) abgenommen wird, wobei der Drucksortierer (12) in der Druckleitung einer Stoffpumpe (9, 10) installiert ist.Method according to one of the preceding claims,
characterized,
that the partial flow (20) is removed as a reject of a pressure sorter (12), wherein the pressure sorter (12) in the pressure line of a fuel pump (9, 10) is installed. Verfahren nach Anspruch 7,
dadurch gekennzeichnet,
dass der Teilstrom (20') nach der Druckreduzierung einem weiteren Drucksortierer (18) zugeführt wird.Method according to claim 7,
characterized,
that the partial flow (20 ') after the pressure reduction to a further pressure screen (18) is supplied. Verfahren nach Anspruch 7,
dadurch gekennzeichnet,
dass der Teilstrom (20') nach der Druckreduzierung entsorgt wird.Method according to claim 7,
characterized,
that the partial flow (20 ') is disposed of after the pressure reduction. Verfahren nach einem der voran stehenden Ansprüche,
dadurch gekennzeichnet,
dass der erhöhte Druck, auf den die Faserstoffsuspension (S) durch mindestens eine Stoffpumpe (9, 10) gebracht wird, zwischen 1,5 und 12 bar, vorzugsweise 5 bis 10 bar, liegt.Method according to one of the preceding claims,
characterized,
that the increased pressure to which the pulp suspension (S) is brought by at least one fuel pump (9, 10) is between 1.5 and 12 bar, preferably 5 to 10 bar. Verfahren nach einem der voran stehenden Ansprüche,
dadurch gekennzeichnet,
dass der Druckabfall in der Turbine (5, 6) zwischen 0,5 und 11 bar liegt.Method according to one of the preceding claims,
characterized,
that the pressure drop in the turbine (5, 6) is between 0.5 and 11. bar. Verfahren nach einem der voran stehenden Ansprüche,
dadurch gekennzeichnet,
dass der Teilstrom (19, 20) mindestens 1000 l/min, vorzugsweise mindestens 10000 l/min, umfasst.Method according to one of the preceding claims,
characterized,
that the partial flow (19, 20) at least 1000 l / min, preferably at least 10,000 l / min.
EP07118786A 2007-01-12 2007-10-18 Method for transporting a fibrous suspension Not-in-force EP1944410B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007001848A DE102007001848A1 (en) 2007-01-12 2007-01-12 Method for conveying a pulp suspension, in particular in the constant part before a headbox of a paper or board machine

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EP1944410A1 true EP1944410A1 (en) 2008-07-16
EP1944410B1 EP1944410B1 (en) 2010-12-15

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009010037A1 (en) 2009-02-21 2010-08-26 Voith Patent Gmbh Arrangement for reducing pressure

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19859770A1 (en) * 1998-06-29 1999-12-30 Voith Sulzer Papiertech Patent Method and device for mixing suspension of substances
US20010018958A1 (en) * 1999-12-16 2001-09-06 Valmet-Karlstad Aktiebolag Arrangement and method for recovery of energy in a paper machine
US6723205B1 (en) * 1999-06-03 2004-04-20 Fom Technology Oy Ab Degassing centrifugal apparatus with energy recovery, process for degassing a fluid and process for producing paper or board

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19859770A1 (en) * 1998-06-29 1999-12-30 Voith Sulzer Papiertech Patent Method and device for mixing suspension of substances
US6723205B1 (en) * 1999-06-03 2004-04-20 Fom Technology Oy Ab Degassing centrifugal apparatus with energy recovery, process for degassing a fluid and process for producing paper or board
US20010018958A1 (en) * 1999-12-16 2001-09-06 Valmet-Karlstad Aktiebolag Arrangement and method for recovery of energy in a paper machine

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DE102007001848A1 (en) 2008-07-17
EP1944410B1 (en) 2010-12-15
ATE491840T1 (en) 2011-01-15
DE502007005943D1 (en) 2011-01-27

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