WO2008145448A1 - Procédé et dispositif de fabrication d'une bande de matière fibreuse - Google Patents

Procédé et dispositif de fabrication d'une bande de matière fibreuse Download PDF

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Publication number
WO2008145448A1
WO2008145448A1 PCT/EP2008/054223 EP2008054223W WO2008145448A1 WO 2008145448 A1 WO2008145448 A1 WO 2008145448A1 EP 2008054223 W EP2008054223 W EP 2008054223W WO 2008145448 A1 WO2008145448 A1 WO 2008145448A1
Authority
WO
WIPO (PCT)
Prior art keywords
measuring
sensor
stock suspension
sensors
ash
Prior art date
Application number
PCT/EP2008/054223
Other languages
German (de)
English (en)
Inventor
Marcus True
Original Assignee
Voith 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
Priority claimed from DE102007025710A external-priority patent/DE102007025710A1/de
Priority claimed from DE200710028771 external-priority patent/DE102007028771A1/de
Application filed by Voith Patent Gmbh filed Critical Voith Patent Gmbh
Priority to EP08735950A priority Critical patent/EP2155958A1/fr
Priority to CN200890100007.9U priority patent/CN201785656U/zh
Publication of WO2008145448A1 publication Critical patent/WO2008145448A1/fr

Links

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
    • D21F1/08—Regulating consistency
    • 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
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/0009—Paper-making control systems
    • D21G9/0027—Paper-making control systems controlling the forming section

Definitions

  • Deviations from the dimensioning of a system constantly lead to problems and often to failures.
  • the invention has for its object to provide an improved method and an improved device of the type mentioned, with which the aforementioned disadvantages are eliminated.
  • a reliable online measurement of the overall consistency of the stock suspension in the field of stock preparation should be possible.
  • the Cs-137 source is suitable for measuring an average density, weighted by the density and absorption coefficients of the constituents. As such, the reading obtained from this source may be correlated to the overall consistency assuming a constant ash and fines content. If the ash content changes, then the combination with the measurement of the ash content serving Cm-244 source or Am-241 source of the correction can serve. As already mentioned, the measurement of the ash content can in particular also include the measurement of the proportion of organic substances.
  • At least one rotating sensor can be used to measure the fiber content.
  • a sensor of this kind is hardly influenced by fines / fillers.
  • the sensors provided for measuring the proportions of different solids in the stock suspension are preferably arranged one after the other in the flow direction of the stock suspension. This is particularly useful when the respective sensors are inserted in a supply line.
  • At least two sensors provided for measuring the proportions of different fines in the stock suspension are combined to form a sensor unit with a single housing. So it can for example a radioactive Cs-137 Queile and a radioactive Cm-244 Source and a radioactive Am-241 source, respectively.
  • the inventive combination of, for example, two suitable sensors enables for the first time a reliable determination of the overall consistency of the stock suspension with high precision ,
  • Radiometric sensors are basically independent of whiteness, flow or ink. If necessary, temperature influences and a respective gas content can be compensated.
  • the radiometric sensors are fundamentally stable for a long time. The lifetime of the source can be predicted and is greater than 10 years. Intensity losses can be compensated by the electronics.
  • Fig. 1 shows a schematic representation of the area of stock preparation of a device 10 for producing a fibrous web from a stock suspension.
  • the fibrous web may in particular be a paper or board web.
  • stock preparation is part of the papermaking process between the fiber production and the paper machine (not shown).
  • the purpose of stock preparation is to prepare the raw material used in such a way that the required paper quality can be produced on the paper machine.
  • the desired product with the required properties is then produced on the paper machine from the processed substances or substance mixtures.
  • the device 10 comprises at least two sensors 12, 14 provided in the region of stock preparation for the online measurement of the proportions of different
  • Solids in the stock suspension also includes in particular electronic
  • the sensor 12 for measuring the FaseranteÜs and the sensor 14 for measuring the proportion of ash and in particular organic fines of the stock suspension is provided.
  • the overall consistency of the stock suspension is determined online from the measured values 18, 20 obtained via the sensors 12, 14 for measuring the fiber fraction and for measuring the ash and fines fraction.
  • the measured values 18, 20 obtained for the different solids can in particular be calibrated by means of a multiple regression tone compared with the total consistency of the stock suspension.
  • At least one of the two sensors 12, 14 may be formed in particular by a radiometric sensor.
  • the senor 12 can be provided as a radiometric sensor for measuring the fiber fraction and / or the sensor 14 as a radiometric sensor for measuring the ash and fines fraction.
  • the senor 12 used to measure the proportion of fiber may in particular comprise a radioactive Cs-137 source.
  • the sensor 14 used to measure the ash and fines fraction may comprise a radioactive Cm-244 source or a radioactive Am-241 source.
  • the sensors 12, 14 can be arranged in particular in the region of at least one feed line 22, via which the stock suspension is supplied in particular to a headbox.
  • the sensors 12, 14 provided for measuring the proportions of different solids in the stock suspension can be arranged one after the other, for example, in the flow direction of the stock suspension. From Another advantage is that when the two sensors 12, 14 provided for measuring the proportions of different solids in the stock suspension are combined to form a sensor unit with a single housing,
  • At least two sensors 12, 14 are used for the online measurement of the overall consistency of the stock suspension.
  • at least one suitable sensor 12 for measuring the fiber content and at least one suitable sensor for measuring the proportion of ash and in particular organic Feänstoffen the stock suspension is used.
  • the two obtained measurements 18, 20 are combined to obtain the overall consistency as a result.
  • the two measured values 18, 20 are calibrated against the overall consistency via a multiple regression.
  • Faserantei! and the proportion of ashes, and especially organic fines is preferably measured by the combination of two radioactive sources, preferably a Cs-137 source to measure fiber content and a Crn-244 source or Am-241 source for measurement the proportion of ash and in particular organic fines.
  • two radioactive sources preferably a Cs-137 source to measure fiber content and a Crn-244 source or Am-241 source for measurement the proportion of ash and in particular organic fines.
  • FIG. 2 and 3 each show, in a schematic representation, an exemplary structure for a respective online measurement, for example in the region of the feed line 22 (see also FIG. 1).
  • the construction shown in FIG. 2 comprises at least one radiometric sensor 12, 14 with a radioactive radiation source 30 and a detector 32.
  • the source 30 and the detector 32 are arranged on opposite sides of the supply line 22, so that from the source 30 outgoing, the penetrating radiation in the Zuurerieitung 32 penetrating radiation into the detector 32 can pass.
  • the first part is the radiometric ash measurement 14 in a compact design, including a radioactive radiation source 30 and a detector 32. Due to the low energy here a small pipe diameter is necessary, therefore, the installation, as shown, realized in a bypass line.
  • the second part is in this embodiment, a radiometric mass density measurement 12, consisting of a radioactive radiation source 30 and a detector 32.
  • the measuring section is designed S-shaped, since here a high-energy radiation source 30, such as Cs-137, is used. This requires a significantly longer measuring section through the pulp suspension.
  • the radiometric method using the radioactive Crn-244 Queile or radioactive Am-241 source can be configured so that the density of water and fibers results in the same absorption. This ensures that the fiber content does not affect the measured value. This is because water and fibers have different absorption coefficients, while ash and optionally inorganic fines have significantly higher density and absorption coefficients.
  • the radioactive Cs-137 source is suitable for measuring an average density, weights! by the density and absorption coefficient of the constituents. The relevant reading can be for you be correlated with the overall consistency, if one assumes a constant ash and fines content. If the ash content varies, the combination with the ash content or content measurement via the Cm-244 sensor or the Am-241 sensor will be used for correction.
  • the Faserantei! be measured by means of a rotating sensor.
  • This type of sensor is hardly affected by fines / fillers.
  • the ash content can be measured by optical methods if the stock suspension is only slightly contaminated.
  • An optical sensor in the infrared (IR) range is suitable for determining the proportion of fines / fillers. This solution is practically only useful if there is no or only a constant contamination by printing ink or the like.
  • Radiometric sensors are basically independent of whiteness, flow or ink. Temperature influences and a respective proportion of gas can be compensated if necessary.
  • the radiometric sensors are fundamentally stable for a long time. The lifetime of the source can be predicted and is over 10 years. Intensity losses can be compensated by the electronics. Mecha ⁇ ische failures are excluded. There are no moving parts and there is no contact between the source and the detector and stock suspension. Maintenance is practically unnecessary.
  • a rotating sensor can also be combined with a radiometric sensor.
  • the two sensors may be provided in the supply line, for example immediately after a pump.
  • the rotating sensor can be used to measure the fiber content.
  • Required failures are different calibrations for different raw materials.
  • a radiometric sensor with a radioactive Cs-137 Quelie is used.

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  • Paper (AREA)

Abstract

L'invention concerne un procédé de fabrication d'une bande de matière fibreuse, notamment une bande de papier ou de carton, à partir d'une suspension de matière. Selon ce procédé, les proportions de différentes substances solides choisies dans la suspension de matière sont mesurées en ligne au moyen de deux capteurs (12, 14) prévus pour la mesure des proportions de différentes substances solides dans la suspension de matière, dans la zone de préparation des matières. A partir des valeurs de mesure (18, 20) obtenues au moyen de ces capteurs (12, 14), la consistance totale de la suspension de matière est calculée en ligne. L'invention concerne également un dispositif correspondant pour la fabrication d'une bande de matière fibreuse.
PCT/EP2008/054223 2007-06-01 2008-04-08 Procédé et dispositif de fabrication d'une bande de matière fibreuse WO2008145448A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP08735950A EP2155958A1 (fr) 2007-06-01 2008-04-08 Procédé et dispositif pour la fabrication d'une bande de matière fibreuse
CN200890100007.9U CN201785656U (zh) 2007-06-01 2008-04-08 用于制造纤维幅面的设备

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102007025710A DE102007025710A1 (de) 2007-06-01 2007-06-01 Verfahren und Vorrichtung zur Herstellung einer Faserstoffbahn
DE102007025710.6 2007-06-01
DE200710028771 DE102007028771A1 (de) 2007-06-22 2007-06-22 Verfahren und Vorrichtung zur Herstellung einer Faserstoffbahn
DE102007028771.4 2007-06-22

Publications (1)

Publication Number Publication Date
WO2008145448A1 true WO2008145448A1 (fr) 2008-12-04

Family

ID=39638877

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2008/054223 WO2008145448A1 (fr) 2007-06-01 2008-04-08 Procédé et dispositif de fabrication d'une bande de matière fibreuse

Country Status (3)

Country Link
EP (1) EP2155958A1 (fr)
CN (1) CN201785656U (fr)
WO (1) WO2008145448A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI127377B (fi) * 2015-10-30 2018-04-30 Valmet Technologies Oy Kuiturainakoneen syöttöjärjestelmä

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6284100B1 (en) * 1997-01-24 2001-09-04 Valmet Corporation Method and apparatus for controlling a headbox in a paper machine
WO2002072948A1 (fr) * 2001-02-23 2002-09-19 Metso Paper Automation Oy Procede et dispositif de commande de la circulation courte dans une machine a papier ou analogue
WO2003034170A1 (fr) * 2001-10-19 2003-04-24 Metso Automation Oy Procede et appareil pour commander le fonctionnement de l'unite de preparation de la pate dans une machine a papier
DE10253822A1 (de) * 2002-11-18 2004-05-27 Voith Paper Patent Gmbh Verfahren und Vorrichtung zur automatischen Sensorkalibrierung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6284100B1 (en) * 1997-01-24 2001-09-04 Valmet Corporation Method and apparatus for controlling a headbox in a paper machine
WO2002072948A1 (fr) * 2001-02-23 2002-09-19 Metso Paper Automation Oy Procede et dispositif de commande de la circulation courte dans une machine a papier ou analogue
WO2003034170A1 (fr) * 2001-10-19 2003-04-24 Metso Automation Oy Procede et appareil pour commander le fonctionnement de l'unite de preparation de la pate dans une machine a papier
DE10253822A1 (de) * 2002-11-18 2004-05-27 Voith Paper Patent Gmbh Verfahren und Vorrichtung zur automatischen Sensorkalibrierung

Also Published As

Publication number Publication date
EP2155958A1 (fr) 2010-02-24
CN201785656U (zh) 2011-04-06

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