EP1005587B1 - Suspension equalizer - Google Patents

Suspension equalizer Download PDF

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Publication number
EP1005587B1
EP1005587B1 EP99939914A EP99939914A EP1005587B1 EP 1005587 B1 EP1005587 B1 EP 1005587B1 EP 99939914 A EP99939914 A EP 99939914A EP 99939914 A EP99939914 A EP 99939914A EP 1005587 B1 EP1005587 B1 EP 1005587B1
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EP
European Patent Office
Prior art keywords
suspension
cross
paper machine
sectional portion
distribution system
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.)
Expired - Lifetime
Application number
EP99939914A
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German (de)
French (fr)
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EP1005587A1 (en
Inventor
Georg-Ingo Keil
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.)
Gebr Bellmer and Co KG Maschinenfabrik GmbH
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Gebr Bellmer and Co KG Maschinenfabrik GmbH
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Publication of EP1005587A1 publication Critical patent/EP1005587A1/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
    • D21F1/0018—Devices for dispensing fibres in a fluid
    • 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • 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
    • D21F1/06—Regulating pulp flow

Definitions

  • the invention relates to a paper machine with a headbox and a non-linear extending supply line (10) for supplying a suspension to the distribution system (20) the souffle casserole according to the preamble of claim 1.
  • a stock suspension is fed to the headbox of a paper machine in several steps.
  • the various ingredients in the suspension such as water, pulp, gypsum, etc. mixed and homogenized in a mixing pump.
  • the suspension is passed through a feed line, generally a pipeline Distribution system fed.
  • This distribution system is often in the form of a circular distributor executed.
  • the distribution system has the task of arriving through the supply line Spread the suspension over the entire width of the headbox. So that Papermaking process can work optimally, it is necessary that the Suspension has the same composition over the entire width of the headbox. If a circular distributor is used as the distribution system, it follows that the through the incoming incoming suspension homogeneously over the entire cross section of the Supply line must be.
  • the speed profile must be above the whole cross section of the supply line should be as constant as possible. This requirement exists also for other distribution systems. As long as the supply line between the mixing pump and Distribution system is currently running, ensures the fulfillment of the above Neither is a problem because the suspension makes the mixing pump homogeneous and leaves with a uniform speed profile. However, this changes if the supply line is no longer straight, or in other words if the pipe, which generally forms the feed line, has a bend. This is usually the case in practice, however, because the structural conditions are straight Prevent routing of the supply line between the mixing pump and distribution systems. To A manifold is both the density of the suspension and its speed in the flow direction no longer constant over the cross-section of the feed line (see figures 4A and B).
  • the object of the invention is therefore to provide a constructive measure with which a suspension homogenized in a feed line before Distribution system is rehomogenized and their speed profile is leveled.
  • the basic idea of the invention is between the last manifold and the Distribution system to install a turbulence generator in the supply line.
  • This Turbulence generator sets the suspension so turbulent that all patterns, which were previously impressed on the current are deleted. This suspension "forgets" her prehistory as it were. Because of this effect, such Turbulence generators are called suspension equalizers.
  • this turbulence generator in Formed a type of Venturi nozzle, which has the particular advantage that it has no moving parts and is very simple.
  • FIG. 2A The basic problem that has to be solved is sketched in FIG. 2A.
  • the stock suspension is from a mixing pump 5 through a feed line 10, which in generally formed by a pipeline, pumped to the distribution system 20. in the in general, however, this feed line 10 does not run straight, but rather as in FIG. 3 shown it has one or more bends.
  • the suspension After the last manifold 15 the suspension has a density and speed distribution as in the Figures 4A and 4B are shown. There is a cut through the middle of the pipe in the X direction viewed along the axis V-V. Since, as shown above, it is undesirable that the suspension with such a density or speed distribution in the Distribution system 20 flows in, is after the last manifold 15 Turbulence generator 40 installed (see Figures 2B and 3).
  • This turbulence generator 40 causes a homogenization of the suspension (see Figure 4C), as well as a Leveling the speed profile (see Figure 4D).
  • Figures 4C and 4D show the conditions as they exist at the outlet of the turbulence generator 40 in the Supply line 10 prevail along the axis N-N.
  • the turbulence generator 40 is designed here in the form of a Venturi nozzle.
  • the suspension first encounters a step-like cross-sectional constriction 42. This causes the suspension to become very turbulent, causing an abrupt Change in the speed and pressure conditions within the liquid is effected, what a good mixing and thus a homogenization Consequence.
  • the liquid then runs through a short section constant cross section 48, followed by a gradual one Cross-sectional expansion 45, whereby the speed profile is directed.
  • On such cross-sectional profile can be installed in a pipe section. It can be as separate component can be executed, which in a conventional tube is definable.
  • the profile is preferably symmetrical with respect to the longitudinal axis of such a pipe section.
  • turbulence generators without moving parts are preferable because they work maintenance-free.
  • it is also conceivable for this purpose To construct turbulence generators which operate on a different principle than that of the abrupt cross-sectional expansion or cross-section work. This one The examples shown only represent particularly simple and elegant solutions of the problem, namely the homogenization and flattening of the Speed profile.

Abstract

A feed line (10) for supplying a suspension in the distribution system (20) of the stock flow (30) of a paper machine is provided with a supsension equalizer (40) arranged upstream from the distribution system (20) and connected thereto by means of a straight feed piece. The suspension equalizer acts as a turbulence generator, whereby it sets the suspension into a state of turbulence with such force that the suspension is homogenized and the acceleration profile of the suspension is equalled out inside the cross-section of the feed line. This also enables optimum stock flow conditions to be created directly prior to the stock flow or even with relatively long feed lines running through windings or curves in order to meet the quality requirements for paper production. In one preferred embodiment, the turbulence generator consists of a tube section that is similar in shape to a venturi tube with an abruptly reduced cross section (42), followed by a gradual expansion of said cross section (45).

Description

Technisches GebietTechnical field

Die Erfindung betrifft eine Papiermaschine mit einem Stoffauflauf und einer nicht linear verlaufenden Zuleitung (10) zum Zuführen einer Suspension zum Verteilsystem (20) des Soffauflaufs nach dem Oberbegriff des Anspruches 1.The invention relates to a paper machine with a headbox and a non-linear extending supply line (10) for supplying a suspension to the distribution system (20) the souffle casserole according to the preamble of claim 1.

Stand der TechnikState of the art

Die Zuführung einer Stoffsuspension zum Stoffauflauf einer Papiermaschine erfolgt in mehreren Schritten. Zunächst werden die verschiedenen Inhaltsstoffe der Suspension wie Wasser, Zellstoff, Gips usw. in einer Mischpumpe gemischt und homogenisiert. Durch eine Zuleitung, im allgemeinen eine Rohrleitung, wird die Suspension einem Verteilsystem zugeführt. Dieses Verteilsystem ist häufig in Form eines Rundverteilers ausgeführt. Das Verteilsystem hat die Aufgabe, die durch die Zuleitung ankommende Suspension auf die ganze Breite des Stoffauflaufs zu verteilen. Damit der Papierherstellungsprozeß optimal funktionieren kann, ist es notwendig, daß die Suspension über die ganze Breite des Stoffauflaufs dieselbe Zusammensetzung hat. Wenn als Verteilsystem ein Rundverteiler eingesetzt wird,folgt daraus, daß die durch die Zuleitung kommende Suspension homogen über den gesamten Querschnitt der Zuleitung sein muß. Darüber hinaus muß auch das Geschwindigkeitsprofil über den ganzen Querschnitt der Zuleitung möglichst konstant sein. Dieses Erfordernis besteht auch für andere Verteilsysteme. Solange die Zuleitung zwischen Mischpumpe und Verteilsystem gerade geführt wird, stellt die Erfüllung des oben genannten Erfordernisses auch kein Problem dar, da die Suspension die Mischpumpe homogen und mit einheitlichem Geschwindigkeitsprofil verläßt. Dies ändert sich jedoch dann, wenn die Zuleitung nicht mehr gerade geführt wird, oder mit anderen Worten, wenn das Rohr, welches im allgemeinen die Zuleitung bildet, einen Krümmer aufweist. Dies ist jedoch in der Praxis meist der Fall, da die baulichen Gegebenheiten eine gerade Führung der Zuleitung zwischen Mischpumpe und Verteilsystemen verhindern. Nach einem Krümmer ist sowohl die Dichte der Suspension wie auch ihre Geschwindigkeit in Fließrichtung nicht mehr über den Querschnitt der Zuleitung konstant (siehe Figuren 4A und B). Um die Suspension vor dem Einlauf in das Verteilsystem zu rehomogenisieren sowie das Geschwindigkeitsprofil zu glätten, wurden bisher verschiedene konstruktive Mahnahmen eingesetzt. Zum einen kann man die Strecke zwischen dem letzten Krümmer und dem Verteilsystem relativ lang machen, so daß man der Suspension genug Zeit gibt, um wieder ins Gleichgewicht zu kommen. Mit dieser Mahnahme kann man zwar eine verhältnismäßig gute Glättung des Geschwindigkeitsprofils erreichen, die Inhomogenität der Suspension bleibt jedoch weitgehend erhalten. Darüber hinaus kann man nach dem Krümmer einen oder mehrere Gegenkrümmer einsetzen, die ihre Wirkung gegenseitig aufheben sollen. Dies ist jedoch konstruktiv recht aufwendig und führt auch nur bedingt zum Erfolg.A stock suspension is fed to the headbox of a paper machine in several steps. First, the various ingredients in the suspension such as water, pulp, gypsum, etc. mixed and homogenized in a mixing pump. The suspension is passed through a feed line, generally a pipeline Distribution system fed. This distribution system is often in the form of a circular distributor executed. The distribution system has the task of arriving through the supply line Spread the suspension over the entire width of the headbox. So that Papermaking process can work optimally, it is necessary that the Suspension has the same composition over the entire width of the headbox. If a circular distributor is used as the distribution system, it follows that the through the incoming incoming suspension homogeneously over the entire cross section of the Supply line must be. In addition, the speed profile must be above the whole cross section of the supply line should be as constant as possible. This requirement exists also for other distribution systems. As long as the supply line between the mixing pump and Distribution system is currently running, ensures the fulfillment of the above Neither is a problem because the suspension makes the mixing pump homogeneous and leaves with a uniform speed profile. However, this changes if the supply line is no longer straight, or in other words if the pipe, which generally forms the feed line, has a bend. This is usually the case in practice, however, because the structural conditions are straight Prevent routing of the supply line between the mixing pump and distribution systems. To A manifold is both the density of the suspension and its speed in the flow direction no longer constant over the cross-section of the feed line (see figures 4A and B). To the suspension before entering the distribution system too Rehomogenize and smooth the speed profile so far various constructive measures were used. For one, you can see the route make it relatively long between the last manifold and the distribution system so that giving the suspension enough time to regain its balance. With This measure can be a relatively good smoothing of the Speed profile, but the inhomogeneity of the suspension remains largely preserved. In addition, one can after the manifold or use several counter elbows, which should cancel each other out. However, this is constructively very complex and leads to success only to a limited extent.

Darstellung der ErfindungPresentation of the invention

Aufgabe der Erfindung ist es daher, eine konstruktive Maßnahme zur Verfügung zu stellen, mit der eine in einer Zuleitung enthomogenisierte Suspension vor dem Verteilsystem rehomogenisiert und ihr Geschwindigkeitsprofil geebnet wird.The object of the invention is therefore to provide a constructive measure with which a suspension homogenized in a feed line before Distribution system is rehomogenized and their speed profile is leveled.

Diese Aufgabe wird durch eine Vorrichtung mit den Merkmalen des Anspruches 1 gelöst.This object is achieved by a device with the features of claim 1 solved.

Grundidee der Erfindung ist es, zwischen dem letzten Krümmer und dem Verteilsystem einen Turbulenzerzeuger in die Zuleitung einzubauen. Dieser Turbulenzerzeuger versetzt die Suspension so stark in Turbulenz, daß alle Muster, welche der Strömung vorher aufgeprägt wurden, gelöscht werden. Diese Suspension "vergißt" gleichsam ihre Vorgeschichte. Wegen dieser Wirkung kann ein solcher Turbulenzerzeuger als Suspensionsegalisator bezeichnet werden. The basic idea of the invention is between the last manifold and the Distribution system to install a turbulence generator in the supply line. This Turbulence generator sets the suspension so turbulent that all patterns, which were previously impressed on the current are deleted. This suspension "forgets" her prehistory as it were. Because of this effect, such Turbulence generators are called suspension equalizers.

In einer besonders bevorzugten Ausführungsform wird dieser Turbulenzerzeuger in Form einer Art Venturidüse ausgebildet, welche insbesondere den Vorteil hat, daß sie keine beweglichen Teile aufweist und sehr einfach aufgebaut ist.In a particularly preferred embodiment, this turbulence generator in Formed a type of Venturi nozzle, which has the particular advantage that it has no moving parts and is very simple.

Kurze Beschreibung der ZeichnungenBrief description of the drawings

Die Erfindung wird nun anhand von Figuren näher beschrieben:

Figur 1
zeigt den Aufbau einer bevorzugten Ausführungsform eines erfindungsgemäßen Turbulenzerzeugers im Querschnitt,
Figur2A
zeigt schematisch den bisherigen Aufbau des Systems Mischpumpe-Verteilsystem-Stoffauflauf,
Figur 2B
zeigt schematisch den erfindungsgemäßen Aufbau des Systems Mischpumpe-Verteilsystem-Stoffauflauf,
Figur 3
zeigt symbolisch die Führung einer Zuleitung um ein Hindernis herum und die Einbauposition des Turbulenzerzeugers,
Fign.4A-4D
zeigen Diagramme, welche Druck- bzw. Geschwindigkeitsverläufe innerhalb der Zuleitung darstellen.
The invention will now be described in more detail with reference to figures:
Figure 1
shows the structure of a preferred embodiment of a turbulence generator according to the invention in cross section,
Figur2A
schematically shows the previous structure of the mixing pump-distribution system-headbox system,
Figure 2B
schematically shows the structure of the system according to the invention mixing pump-distribution system-headbox,
Figure 3
symbolically shows the routing of a supply line around an obstacle and the installation position of the turbulence generator,
Fign.4A-4D
show diagrams showing the pressure and speed profiles within the supply line.

Bevorzugtes AusführungsbeispielPreferred embodiment

Das Grundproblem, welches es zu lösen gilt, ist in Figur 2A skizzenhaft dargestellt. Die Stoffsuspension wird von einer Mischpumpe 5 durch eine Zuleitung 10, welche im allgemeinen durch eine Rohrleitung gebildet wird, zum Verteilsystem 20 gepumpt. Im allgemeinen verläuft diese Zuleitung 10 jedoch nicht gerade, sondern wie in Figur 3 dargestellt weist sie eine oder mehrere Biegungen auf. Nach dem letzten Krümmer 15 weist die Suspension eine Dichte- und Geschwindigkeitsverteilung auf wie sie in den Figuren 4A und 4B dargestellt sind. Es wird ein Schnitt durch die Rohrmitte in XRichtung entlang der Achse V-V betrachtet. Da es, wie oben dargestellt, unerwünscht ist, daß die Suspension mit einer solchen Dichte- bzw. Geschwindigkeitsverteilung in das Verteilsystem 20 hineinfließt, wird nach dem letzten Krümmer 15 ein Turbulenzerzeuger 40 eingebaut (siehe Figuren 2B und 3). Dieser Turbulenzerzeuger 40 bewirkt eine Homogenisierung der Suspension (siehe Figur 4C), sowie eine Einebnung des Geschwindigkeitsprofils (siehe Figur 4D). Die Figuren 4C und 4D zeigen die Verhältnisse, wie sie am Ausgang des Turbulenzerzeugers 40 in der Zuleitung 10 entlang der Achse N-N herrschen.The basic problem that has to be solved is sketched in FIG. 2A. The stock suspension is from a mixing pump 5 through a feed line 10, which in generally formed by a pipeline, pumped to the distribution system 20. in the in general, however, this feed line 10 does not run straight, but rather as in FIG. 3 shown it has one or more bends. After the last manifold 15 the suspension has a density and speed distribution as in the Figures 4A and 4B are shown. There is a cut through the middle of the pipe in the X direction viewed along the axis V-V. Since, as shown above, it is undesirable that the suspension with such a density or speed distribution in the Distribution system 20 flows in, is after the last manifold 15 Turbulence generator 40 installed (see Figures 2B and 3). This turbulence generator 40 causes a homogenization of the suspension (see Figure 4C), as well as a Leveling the speed profile (see Figure 4D). Figures 4C and 4D show the conditions as they exist at the outlet of the turbulence generator 40 in the Supply line 10 prevail along the axis N-N.

Nachfolgend wird eine bevorzugte Ausführungsform des Turbulenzerzeugers 40 dargestellt. Der Turbulenzerzeuger 40 ist hier in Form einer Venturidüse ausgeführt. Zunächst trifft die Suspension auf eine stufenartige Querschnittsverengung 42. Dadurch wird die Suspension in starke Turbulenz versetzt, wodurch eine abrupte Änderung der Geschwindigkeits- und Druckverhältnisse innerhalb der Flüssigkeit bewirkt wird, was eine gute Durchmischung und somit eine Homogenisierung zur Folge hat. Anschließend durchläuft die Flüssigkeit einen kurzen Abschnitt mit konstantem Querschnitt 48, anschließend folgt eine allmähliche Querschnittserweiterung 45, wodurch das Geschwindigkeitsprofil gerichtet wird. Ein solches Querschnittsprofil kann in einem Rohrabschnitt eingebaut sein. Es kann als separates Bauteil ausgeführt werden, welches in einem konventionellen Rohr festlegbar ist. Vorzugsweise ist das Profil symmetrisch bezüglich der Längsachse eines solchen Rohrabschnittes. Dadurch, daß die Suspension mit einem entiang des Rohrquerschnitts ungleichmäßigen Geschwindigkeitsprofil auf die Querschnittsverengung 42 trifft, wird sie auch in Rotation versetzt. Dies trägt ebenfalls zu guten Vermischungen und Homogenisierung bei.A preferred embodiment of the turbulence generator 40 follows shown. The turbulence generator 40 is designed here in the form of a Venturi nozzle. The suspension first encounters a step-like cross-sectional constriction 42. This causes the suspension to become very turbulent, causing an abrupt Change in the speed and pressure conditions within the liquid is effected, what a good mixing and thus a homogenization Consequence. The liquid then runs through a short section constant cross section 48, followed by a gradual one Cross-sectional expansion 45, whereby the speed profile is directed. On such cross-sectional profile can be installed in a pipe section. It can be as separate component can be executed, which in a conventional tube is definable. The profile is preferably symmetrical with respect to the longitudinal axis of such a pipe section. The fact that the suspension with an entiang des Pipe cross section irregular speed profile on the Cross-sectional constriction 42 hits, it is also set in rotation. This also bears to good mixing and homogenization.

Prinzipiell sind Turbulenzerzeuger ohne bewegliche Teile vorzuziehen, da sie wartungsfrei arbeiten. Es ist jedoch auch denkbar, für diesen Zweck Turbulenzerzeuger zu konstruieren, welche nach einem anderen Prinzip als dem der abrupten Querschnittserweiterung bzw. Querschnittsverengung arbeiten. Die hier gezeigten Beispiele stellen nur besonders einfache und elegante Lösungen des vorliegenden Problems, nämlich der Homogenisierung und der Verflachung des Geschwindigkeitsprofils dar.In principle, turbulence generators without moving parts are preferable because they work maintenance-free. However, it is also conceivable for this purpose To construct turbulence generators which operate on a different principle than that of the abrupt cross-sectional expansion or cross-section work. This one The examples shown only represent particularly simple and elegant solutions of the problem, namely the homogenization and flattening of the Speed profile.

Claims (8)

  1. Paper machine, having a headbox and a non-linearly extending feed pipe (10) for supplying a suspension to the distribution system (20) of the headbox, characterised in that the feed pipe (10) has a suspension equaliser (40), which is connected upstream of the distribution system and is connected to the distribution system (20) via a rectilinear piece of feed pipe.
  2. Paper machine according to claim 1, characterised in that the suspension equaliser is a turbulence generator (40), which has a constricted cross-sectional portion (42), which is irregular when viewed with respect to the flow direction, and a subsequent widened cross-sectional portion (45).
  3. Paper machine according to claim 2, characterised in that a portion of constant cross-section (48) is situated between the constricted cross-sectional portion (42) and the widened cross-sectional portion (45).
  4. Paper machine according to claim 2 or 3, characterised in that the widened cross-sectional portion (45) extends continuously.
  5. Paper machine according to claim 3 or 4, characterised in that the turbulence generator is a tubular portion, the inside of which has the constricted cross-sectional portion (42) and the widened cross-sectional portion (45).
  6. Paper machine according to claim 5, characterised in that the tube portion is rotationally symmetrical in respect of its longitudinal axis.
  7. Paper machine according to claim 5 or 6, characterised in that the tube diameter upstream of the constricted cross-sectional portion (42) is just as large as that downstream of the widened cross-sectional portion (45).
  8. Paper machine according to claim 5, characterised in that the constricted cross-sectional portion (42) and the widened cross-sectional portion (45) are obtained by a separate component part which is securable in the tubular portion.
EP99939914A 1998-06-23 1999-06-19 Suspension equalizer Expired - Lifetime EP1005587B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE29811054U 1998-06-23
DE29811054U DE29811054U1 (en) 1998-06-23 1998-06-23 Suspension equalizer
PCT/DE1999/001803 WO1999067460A1 (en) 1998-06-23 1999-06-19 Suspension equalizer

Publications (2)

Publication Number Publication Date
EP1005587A1 EP1005587A1 (en) 2000-06-07
EP1005587B1 true EP1005587B1 (en) 2002-12-18

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EP99939914A Expired - Lifetime EP1005587B1 (en) 1998-06-23 1999-06-19 Suspension equalizer

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EP (1) EP1005587B1 (en)
AT (1) ATE230045T1 (en)
DE (2) DE29811054U1 (en)
TR (1) TR200000485T1 (en)
WO (1) WO1999067460A1 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0953677A2 (en) * 1998-04-30 1999-11-03 Voith Sulzer Papiertechnik Patent GmbH Apparatus for removing rotating flows

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI72550C (en) * 1985-12-31 1987-06-08 Valmet Oy FOERFARANDE OCH ANORDNING I EN PAPPERSMASKIN SAMT EN MED FOERFARANDET FRAMSTAELLD PAPPERSBANA.
EP0427712A1 (en) * 1987-11-04 1991-05-22 J.M. Voith Ag Process for manufacturing web-type materials from fibers or other particles suspended in newtonian or non-newtonian fluids
DE9421889U1 (en) * 1993-07-05 1997-02-27 J.M. Voith Gmbh, 89522 Heidenheim Device for the blockage-free throttling of a fluid suspension flow

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0953677A2 (en) * 1998-04-30 1999-11-03 Voith Sulzer Papiertechnik Patent GmbH Apparatus for removing rotating flows

Also Published As

Publication number Publication date
TR200000485T1 (en) 2000-11-21
EP1005587A1 (en) 2000-06-07
WO1999067460A1 (en) 1999-12-29
DE29811054U1 (en) 1998-09-17
DE59903822D1 (en) 2003-01-30
ATE230045T1 (en) 2003-01-15

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