EP2155958A1 - Procédé et dispositif pour la fabrication d'une bande de matière fibreuse - Google Patents

Procédé et dispositif pour la fabrication d'une bande de matière fibreuse

Info

Publication number
EP2155958A1
EP2155958A1 EP08735950A EP08735950A EP2155958A1 EP 2155958 A1 EP2155958 A1 EP 2155958A1 EP 08735950 A EP08735950 A EP 08735950A EP 08735950 A EP08735950 A EP 08735950A EP 2155958 A1 EP2155958 A1 EP 2155958A1
Authority
EP
European Patent Office
Prior art keywords
measuring
sensor
stock suspension
sensors
ash
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.)
Withdrawn
Application number
EP08735950A
Other languages
German (de)
English (en)
Inventor
Marcus True
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
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
Publication of EP2155958A1 publication Critical patent/EP2155958A1/fr
Withdrawn legal-status Critical Current

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

  • the invention relates to a method and an apparatus for producing a fibrous web, in particular paper or board web, from a stock suspension.
  • the actual production quantity is determined by the flow rate and (total) consistency of the pulp suspension. It is desirable to be able to measure the production quantity or consistency online as early as possible in the manufacturing process. It is necessary the
  • Deviations from the dimensioning of a system constantly lead to problems and often to failures.
  • the aqueous suspension or stock suspension contains several percent solids. These solids include mainly long and short fibers, ashes and fines (fillers) such as, in particular, calcium carbonate, kaolin, talc and starch. Various contaminants such as printing ink, plastics or metal occur in deinking systems.
  • BCG peak value method
  • Radiometric methods are known to be useful for determining the density of a suspension.
  • Fülistoffen / fines and fibers possible.
  • a Cm-244 Quelie allows the determination of the proportion of fines / fillers, in particular the mineral ash in a suspension. Fiber fines are not detected by Cm-244, but by Cs-137. The fiber and water content leads to a very similar absorption, which is subordinate to that of fillers.
  • 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.
  • this object is achieved by a method for producing a fibrous web, in particular paper or board web, from a stock suspension, in which by means of at least two provided for measuring the proportions of different solids in the stock suspension sensors in the field of stock preparation, the proportions of the respective different solids in the pulp suspension is measured online and the overall consistency of the pulp suspension is determined online from the measured values obtained via these sensors.
  • the production or production quantity can be calculated and controlled and / or regulated.
  • at least one sensor for measuring the fiber content and at least one sensor for measuring the proportion of ash and in particular organic fines of the stock suspension are used.
  • Vorteiihaft the total consistency of the stock suspension can therefore be determined from the results obtained via these sensors for measuring the fiber content and for measuring the ash and fines fraction.
  • the measured values obtained for the different solids are preferably calibrated over a multiple regression compared with the overall consistency of the stock suspension.
  • At least one, preferably at least two radiometric sensors are used.
  • At least one radiometric sensor can be used to measure the fiber content.
  • a sensor used to measure the fiber content comprises a radioactive Cs-137 source.
  • At least one radiometric sensor for measuring the ash and fines content.
  • a sensor used to measure the ash and fines fraction may in particular comprise a radioactive Cm-244 source or a radioactive Arn-241 source.
  • a radioactive Cs-137 source and a radioactive Cm-244 source or a radioactive Am-241 source can be combined to determine the overall consistency of the stock suspension.
  • X-rays with corresponding energy intensities can also be used, in particular when measuring the ash content.
  • the ranges of the required energy intensities lie between 40 and 450 keV, in particular between 40 and 100 keV in the measurement of the ash content and between 200 and 450 keV in the measurement of the fabric roofs or the consistency.
  • the radiometric method using the Cm-244 source or the 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 of the not affected by this quelie. This is because water and fibers have different absorption coefficients, while ash has a significantly higher density and absorption coefficient.
  • 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 microwave may also be used in combination with an ash measurement using a Cm-244 source or an Am-241 source.
  • At least one rotating sensor can be used to measure the fiber content.
  • a sensor of this kind is hardly influenced by fines / fillers.
  • At least one optical sensor in particular IR (infrared) sensor
  • IR infrared
  • the use of such an optical sensor may in particular come into question when the stock suspension is contaminated to a lesser extent.
  • These sensors in the infrared (IR) range are suitable for determining the content of fines / fillers.
  • IR infrared
  • the sensors can be used, for example, in the region of at least one supply line, via which the stock suspension is fed to a headbox.
  • the proportions of the different solids that is to say in particular the proportion of fibers and the proportion of ash and in particular organic fines, can be carried out at least substantially in the region of one and the same measuring point.
  • 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.
  • the determined overall consistency of the stock suspension is used to control and / or regulate at least one quality parameter of the fibrous web.
  • the object mentioned above is additionally achieved by a device for producing a fibrous web, in particular paper or board web, from a stock suspension, with at least two sensors provided in the area of stock preparation for online measurement of the proportions of different solids in the stock suspension and in particular electronic Evaluation means for the online determination of the overall consistency of the stock suspension from the measured values obtained via these sensors.
  • 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.
  • From Vortei! is in particular also when a signal representative of the determined overall consistency of the stock suspension is fed to a control and / or regulating device for controlling and / or regulating at least one quality parameter of the fibrous web.
  • 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.
  • 1 is a schematic representation of the area of stock preparation of a device for producing a
  • FIG. 2 shows a schematic representation of an exemplary construction for an oniine measurement in the region of a supply line
  • FIG. and FIG. 3 shows a schematic illustration of a further exemplary construction for a further online measurement in the area of a
  • 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,
  • a signal 24 representative of the determined overall consistency of the stock suspension is generated from the measured values 18, 20 of the sensors 12, 14.
  • This signal can be supplied via a feedback loop to a control and / or regulating device 26 for controlling and / or regulating at least one quality parameter of the fibrous web, for example.
  • the corresponding control or regulating intervention can take place in the stock suspension, for example directly behind a pump 28.
  • 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.

Landscapes

  • 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.
EP08735950A 2007-06-01 2008-04-08 Procédé et dispositif pour la fabrication d'une bande de matière fibreuse Withdrawn EP2155958A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007025710A DE102007025710A1 (de) 2007-06-01 2007-06-01 Verfahren und Vorrichtung zur Herstellung einer Faserstoffbahn
DE200710028771 DE102007028771A1 (de) 2007-06-22 2007-06-22 Verfahren und Vorrichtung zur Herstellung einer Faserstoffbahn
PCT/EP2008/054223 WO2008145448A1 (fr) 2007-06-01 2008-04-08 Procédé et dispositif de fabrication d'une bande de matière fibreuse

Publications (1)

Publication Number Publication Date
EP2155958A1 true EP2155958A1 (fr) 2010-02-24

Family

ID=39638877

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08735950A Withdrawn EP2155958A1 (fr) 2007-06-01 2008-04-08 Procédé et dispositif pour la 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

Family Cites Families (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
FI115539B (fi) * 2001-02-23 2005-05-31 Metso Automation Oy Menetelmä ja järjestelmä paperikoneen tai vastaavan lyhyen kierron säädössä
FI115081B (fi) * 2001-10-19 2005-02-28 Metso Automation Oy Menetelmä ja laitteisto paperikoneen massaosaston toiminnan ohjaamiseksi
DE10253822A1 (de) * 2002-11-18 2004-05-27 Voith Paper Patent Gmbh Verfahren und Vorrichtung zur automatischen Sensorkalibrierung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2008145448A1 *

Also Published As

Publication number Publication date
CN201785656U (zh) 2011-04-06
WO2008145448A1 (fr) 2008-12-04

Similar Documents

Publication Publication Date Title
DE2923946C2 (de) Vorrichtung zum Anzeigen der Teilchengrössenverteilung von strömenden Teilchenmengen in Fraktionsklassen
EP2284518A1 (fr) Procédé de détermination d'un paramètre, notamment du besoin en oxygène chimique (CSB), de la teneur totale en carbone organique (TOC) ou de la concentration d'un ou de plusieurs composants d'un échantillon de liquide
DE2432891A1 (de) Einrichtung zum messen des gewichts pro flaecheneinheit verschiedener bestandteile eines bahnenfoermigen materials
EP0972882A1 (fr) Système de mesure
DE3643764A1 (de) Verfahren zur selektiven fuellstoffmessung an laufenden materialbahnen, insbesondere papierbahnen
EP0815320A1 (fr) Procede et dispositif de regulation du processus d'exploitation d'une machine a papier
DE2537712A1 (de) Vorrichtung zur messung der konzentration von schwebstoffen in einer fluessigkeit
EP0946820B1 (fr) Procede et dispositif pour conduire un processus lors de la fabrication de papier
DE102015105039A1 (de) Imprägnieranlage und Verfahren zu deren Überwachung
EP2155958A1 (fr) Procédé et dispositif pour la fabrication d'une bande de matière fibreuse
EP1653214A1 (fr) Procédé de détermination de caractéristiques d'une suspension fibreuse
DE102006009450B4 (de) Verfahren zur Qualitätssicherung bei der Papierherstellung
DE102007025710A1 (de) Verfahren und Vorrichtung zur Herstellung einer Faserstoffbahn
EP0961117A1 (fr) Methode et dispositif de mesure pour la détermination quantitative des composants dans un mélange de matière-solide/liquide
DE102007028771A1 (de) Verfahren und Vorrichtung zur Herstellung einer Faserstoffbahn
EP2223085A1 (fr) Procédé et dispositif pour détecter au moins une grandeur caractérisant au moins indirectement les propriétés d'une surface dans un équipement de traitement d'une bande de matériau, et procédé pour optimiser le mode de fonctionnement d'un équipement de traitement d'une bande de matériau
DE3822783A1 (de) Verfahren zur steuerung der retentionsmittelzugabe bei der papierherstellung
DE102005023160B4 (de) Vorrichtung zur Erfassung und Bewertung von hygroskopischen Materialien
DE102019105668B4 (de) Verfahren und messgerät zum messen einer suspension
EP3441521B1 (fr) Procédé et dispositif de commande d'une unité d'usinage, produit- programme informatique ainsi que machine à papier
WO2014044473A1 (fr) Procédé et dispositif pour determiner des propriétés d'une suspension et/ou des substances la composant
WO2022135936A1 (fr) Procédé de mesure de quantités de substances dans un mélange de substances
DE2353772C3 (de) Verfahren und Gerät zur kontinuierlichen optischen Messung des Feuchtigkeitsgehalts einer Papierbahn
WO2014044474A1 (fr) Sonde de mesure et procédé pour quantifier des propriétés d'une suspension et/ou des substances la composant
DE3717144A1 (de) Verfahren und vorrichtung zur kontrolle von papierbestandteilen bei der papierherstellung

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20100104

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TRUE, MARCUS

DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20140515

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20140926