EP1449957A1 - Procédé pour déterminer les propriétés d'une suspension de fibres - Google Patents

Procédé pour déterminer les propriétés d'une suspension de fibres Download PDF

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Publication number
EP1449957A1
EP1449957A1 EP03025880A EP03025880A EP1449957A1 EP 1449957 A1 EP1449957 A1 EP 1449957A1 EP 03025880 A EP03025880 A EP 03025880A EP 03025880 A EP03025880 A EP 03025880A EP 1449957 A1 EP1449957 A1 EP 1449957A1
Authority
EP
European Patent Office
Prior art keywords
pressure
sorter
measured
rotor
pulses
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
EP03025880A
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German (de)
English (en)
Other versions
EP1449957B1 (fr
Inventor
Samuel Professor Dr. Schabel
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 Paper Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH
Publication of EP1449957A1 publication Critical patent/EP1449957A1/fr
Application granted granted Critical
Publication of EP1449957B1 publication Critical patent/EP1449957B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • D21D5/02—Straining or screening the pulp
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • Fibrous suspensions formed because a large part of the required The best way to carry out work steps with such suspensions. Fibrous suspensions of this type have a complex rheological behavior. Your Toughness depends not only on the composition of the fibers, the proportion of Additives, the solids content in the suspension and the treatment status of the Fibers, but also from the applied shear force gradient. When regulating and It is the control system for the processing of pulp or waste paper usually very important, the consistency of the fiber suspension, i.e. the Knowing the solids content at certain points in the system as precisely as possible. For this there are inline-working consistency measuring devices, but they are complex and also do not always give good results.
  • An important step in pulp and paper fiber processing is in executed a pressure sorter and serves to use a fiber suspension dividing a sieve into at least two fractions.
  • the in the fiber suspension Fibers contained are said to flow through the openings of the sieve pass through while the unwanted solid components are rejected and as Overflow current from the sorter to be led out separately. In other cases it should be aimed to divide the fiber suspension into fractions, the fibers in the Seen in different lengths mean.
  • the sorting openings are e.g. slots or round holes are used. It is known for the effect of a sorter not only the selection of the sieve is important, but also operating parameters such as the quantitative division into flow and overflow. When laying down This division takes into account the requirements placed on the sorting process, the rheological behavior of the pulp suspension in the pressure sorter Sets limits.
  • Pressure sorters can have both flat and cylindrical sieve inserts. To prevent the sieve openings from becoming blocked, they are equipped with rotors, e.g. are provided with wings that are moved along the surface of the screen can, so that vortices arise there for the stated purpose. Then you also speak from siebdisproportionater.
  • the invention is based on the object of a method for determining the to find rheological properties of the fiber suspension that can be used there, where a pressure screen with a rotor is used. It's supposed to be special be simple and in special embodiments for regulating or controlling the Pressure sorter.
  • the process takes advantage of the fact that the rotor in the pulp suspension generated pressure surges depending on the rheology of the suspension until the Pressure transducer can be damped to different degrees.
  • the pressure pulses are evaluated, for example, so that the pressure surges generated by the rotor are filtered out and their amplitudes are used to form a measured value.
  • Pressure signals are subjected to a fast Fourier transformation and the Peak values added. This is then verified by appropriate calibration e.g. with the The consistency of the suspension has been linked.
  • Most known Consistency measuring devices also work on the principle of measurement rheological quantities to correlate a consistency measurement.
  • the inventive method offers a particular advantage when the rheological properties of the fiber suspension significantly on the operation of the Impact sorter.
  • the operating behavior depends on a Pressure sorter also depends on how far a thickening of the pressure sorter passed suspension takes place. So there are operating conditions where a relatively small overflow quantity set for sorting technology reasons should be, but operational safety no longer for rheological reasons is guaranteed.
  • a Operating mode can be found that requires a good compromise between Operational safety (larger overflow) and optimal reject composition (smaller overflow) of the pressure sorter.
  • Another rule option is to increase the rotor speed if the thickening of the rotor is too strong Suspension is reported. You can do this at a selected point in the Pressure sorter measured pressure pulse value are sufficient. The use is more precise two pressure pulse signals at different points, which are chosen so that the Thickening of the fiber suspension determined their way through the pressure sorter becomes.
  • a pressure sorter is shown in section, without this figure as Engineering drawing would be understood.
  • the actual sieve 3 is designed as a cylindrical sieve basket and divides from the inlet space 1 an accept material space 4, which with the accept material outlet 5 for the flow A in Connection is established.
  • the inlet space 1 goes into the reject space 6 at its lower end via, to which a reject line 7 is connected, through which the overflow current R flows.
  • the screen 3 is kept free of blockages by a rotor 8, whereby here as an example a hub part 9 with attached clearing blades 10 (in the form hydraulic foils) is drawn.
  • the housing wall 11 of the pressure sorter that closes the accepting substance space 4 is two here Pressure transducers 12, 13 shown, the hydraulically with the 4 Gutstoffraum Connect. This allows those in the suspension to appear there Pressure pulses are measured and sent to a measured value evaluation device 14 to get redirected.
  • the pressure transducers 12, 13 are advantageously there positioned where clear measurement signals occur. This is particularly the case in the hazardous materials room 4 the case where the pulsations generated by the clearing vanes 10 have an effect and the is generally easily accessible.
  • the reject line 7 is here with a controllable valve 15 provided with the during operation of the pressure sorter the amount of reject can be adjusted. This control process is only an example to watch.
  • the pressures P measured by a pressure transducer, plotted over time T, are shown qualitatively in Fig. 2.
  • a curve 16 is shown on the left, which is shown in Dependence on rotor speed and number of blades at certain intervals Contains peak values 17.
  • the size of these peak values is - as already explained - as a measured value for assessing the rheological properties of the suspension to watch.
  • the peak values become larger or smaller displayed. While the left part of the diagram shows a first operating state 18 represents, the second part shows a changed operating state 19, in which the Peak values 17 'of curve 16' become smaller as a result of increasing suspension thickening became.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
EP03025880A 2003-02-05 2003-11-12 Procédé pour déterminer les propriétés d'une suspension de fibres Expired - Lifetime EP1449957B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10304621 2003-02-05
DE10304621A DE10304621B4 (de) 2003-02-05 2003-02-05 Verfahren zur Bestimmung von rheologischen Eigenschaften einer Faserstoffsuspension

Publications (2)

Publication Number Publication Date
EP1449957A1 true EP1449957A1 (fr) 2004-08-25
EP1449957B1 EP1449957B1 (fr) 2009-02-11

Family

ID=32730765

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03025880A Expired - Lifetime EP1449957B1 (fr) 2003-02-05 2003-11-12 Procédé pour déterminer les propriétés d'une suspension de fibres

Country Status (3)

Country Link
EP (1) EP1449957B1 (fr)
AT (1) ATE422578T1 (fr)
DE (2) DE10304621B4 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008006939A2 (fr) * 2006-07-10 2008-01-17 Metso Paper, Inc. Procédé et appareil pour déterminer la consistance d'une suspension
CN106968119A (zh) * 2015-12-02 2017-07-21 相川铁工株式会社 制纸用筛滤装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0905309A2 (fr) * 1995-02-03 1999-03-31 Hermann Finckh Maschinenfabrik GmbH & Co. Tamis et appareil de tamisage sous pression pour suspensions fibreuses

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994000634A1 (fr) * 1992-06-20 1994-01-06 Hermann Finckh Maschinenfabrik Gmbh & Co. Trieuse sous pression pour suspensions fibreuses
DE19856207A1 (de) * 1998-12-05 2000-06-08 Voith Sulzer Papiertech Patent Verfahren und Vorrichtung zur Entfernung von Störstoffen aus einer wässrigen Papierfaserstoffsuspension

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0905309A2 (fr) * 1995-02-03 1999-03-31 Hermann Finckh Maschinenfabrik GmbH & Co. Tamis et appareil de tamisage sous pression pour suspensions fibreuses

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008006939A2 (fr) * 2006-07-10 2008-01-17 Metso Paper, Inc. Procédé et appareil pour déterminer la consistance d'une suspension
WO2008006939A3 (fr) * 2006-07-10 2008-04-03 Metso Paper Inc Procédé et appareil pour déterminer la consistance d'une suspension
CN106968119A (zh) * 2015-12-02 2017-07-21 相川铁工株式会社 制纸用筛滤装置
CN106968119B (zh) * 2015-12-02 2019-05-31 相川铁工株式会社 制纸用筛滤装置

Also Published As

Publication number Publication date
EP1449957B1 (fr) 2009-02-11
DE10304621A1 (de) 2004-08-26
DE50311169D1 (de) 2009-03-26
ATE422578T1 (de) 2009-02-15
DE10304621B4 (de) 2005-04-28

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