WO2014044473A1 - Method and device for determining properties and/or ingredients of a suspension - Google Patents

Method and device for determining properties and/or ingredients of a suspension Download PDF

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Publication number
WO2014044473A1
WO2014044473A1 PCT/EP2013/066960 EP2013066960W WO2014044473A1 WO 2014044473 A1 WO2014044473 A1 WO 2014044473A1 EP 2013066960 W EP2013066960 W EP 2013066960W WO 2014044473 A1 WO2014044473 A1 WO 2014044473A1
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Prior art keywords
light
suspension
detection channels
coupling
channel
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PCT/EP2013/066960
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German (de)
French (fr)
Inventor
Thomas Klenk
Matthias Eberhardt
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Voith Patent Gmbh
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Publication of WO2014044473A1 publication Critical patent/WO2014044473A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/02—Investigating particle size or size distribution
    • G01N15/0205—Investigating particle size or size distribution by optical means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid

Definitions

  • the present invention relates to a method and a device for the quantitative detection of properties and / or ingredients of a suspension, in particular a pulp suspension for paper, tissue or board web production.
  • a pulp suspension for paper, tissue or also cardboard web production, a fiber suspension is prepared in a pulp preparation, then applied by means of a headbox to a sieve belt and dewatered or dried so that it results in a fibrous web.
  • a headbox for a pulp preparation
  • dewatered or dried so that it results in a fibrous web.
  • the most accurate knowledge possible of the ingredients of the fiber suspension is essential.
  • Pulp suspensions also contain various fillers, such as clay, calcium carbonate, etc., and various chemicals, e.g. for bleaching the fibers or flocculating between the various suspended substances.
  • various fillers such as clay, calcium carbonate, etc.
  • various chemicals e.g. for bleaching the fibers or flocculating between the various suspended substances.
  • concentration measurement of pulp density and ash content of the pulp suspensions is of central importance.
  • An inline measurement can be done in different ways.
  • Various measuring methods for measuring concentrations in a pulp suspension are known from the prior art.
  • optical measuring methods are used for the determination of the ingredients. Essentially, there are two optical methods for measuring consistency and ash content of a suspension in a machine for manufacturing and / or finishing a fibrous web known.
  • properties of the suspension are measured with transmitted light, in the other method with scattered light.
  • the transmitted light measurement is usually measured monochromatically.
  • the transmitter and the receiver are about 1, 5 to 3mm apart so that the suspension in between can be measured.
  • "shadows" of particles in the suspension are measured.
  • the transmitted light measurement is independent of the particle type. Due to a small measuring window, the light beam has a diameter between 0.2mm and 0.5mm, the transmitted light measuring method is strongly dependent on the flocculation and the flow of the suspension, which can lead to measurement errors.
  • the scattered light measurement measures the light scattered back from particles in the suspension of a large but undefined volume range.
  • the scattered light measurement is highly dependent on the particle type and its scattering intensity.
  • sensors based on the scattered light measurement are known with which the total material density can be measured up to a substance density of up to approx. 4.5%. Separate determination of individual components in the suspension, however, is limited. Depending on the concentration of the ingredients, the measurement must be done in a bypass. In addition, the aging of the light sources affects the measurement.
  • EP 1 653 214 A1 discloses a method and a device which combines these two measuring methods with one another and thus leads to a better measurement result. However, it has been shown that the measurement still does not meet the requirements.
  • measuring devices for bypass or Linelessness known that measure the consistency in a suspension stream by means of mechanical devices. Such a device is described for example in EP 1 331 480 A1.
  • the object of the invention is to propose a method and a device which is suitable for in-line measurement of pulp density and ash content of a pulp suspension.
  • a method is proposed in which light is introduced into the suspension to be measured by means of a measuring device comprising at least one light source and a light measuring device and the light reflected by the suspension is recorded and the quantity of light received is determined quantitatively and / or qualitatively.
  • the light is coupled into the suspension selectively via a first channel at an injection point and the light reflections of the resulting halo are decoupled, measured and analyzed via at least two detection channels.
  • the detection channels can therefore be arranged arbitrarily around the coupling-in point of the light radiation, the first channel.
  • the detection channels are arranged at different distances around the coupling-in point of the light radiation.
  • the light transmission cross sections of the detection channels can be adapted to the light intensity of the reflected light with increasing distance to the coupling-in point.
  • the measuring device can be adapted to the deteriorating lighting conditions.
  • the light measuring device may be a spectrometer system, by means of which at least one property and / or an ingredient is measured and analyzed by spectrometric analysis of the coupled-out light reflections.
  • coupled-out light reflections can be directed by a light guide system on the spectrometer, which may consist of several spectrometers, which are each coupled to a detection channel.
  • the spectrometer system comprises an evaluation electronics or is connected to a corresponding computer for the evaluation of the measurement results.
  • the calculated values can be approximated by algorithms to the measurement results so that absolute values for the reduced scattering coefficient and / or the spectral absorption coefficient can be determined.
  • the measured distribution curve is thus compared with a simulation simulated from calculations.
  • the calculated course is approximated to the measured course. If the curves are approximately congruent, it is assumed that the value pair for the reduced scattering coefficient and the spectral absorption coefficient is found. From the values of these coefficients, or from their change over the measured spectrum, the pulp density and / or the ash content can be determined.
  • the device comprises a measuring probe, at least one light source, for coupling light into the suspension to be measured, and a light measuring device, by means of which the light reflected by the suspension is recorded and the quantity of light received can be quantitatively and / or qualitatively determined.
  • the probe has a mask with a first channel, for coupling the light into the suspension at a coupling-in point, and at least two detection channels for coupling out light reflections from the fiber suspension.
  • the detection channels are arranged at different distances around the coupling-in point of the first channel.
  • the detection channels can also be arranged radially to the coupling-in point of the first channel or radially on a line starting from the coupling-in point of the first channel.
  • the detection channels can also have larger light transmission cross sections with increasing distance.
  • a machine for producing a fibrous web is claimed with a corresponding device.
  • the measuring probe is preferably inserted into a pipeline through which a suspension stream flows, and / or into a fabric chest.
  • the invention makes use of the effect of the spatially spectrally resolved light scattering in an advantageous manner in order to determine in-line pulp density and ash content in pulp suspensions. Further features and further advantages of the invention will become apparent from the following description of a preferred embodiment with reference to the drawing.
  • FIG. 1 shows a schematic diagram of the measuring system.
  • the aim is to determine the contents of the suspension 7, in particular the pulp density 1 1 and the ash content 12.
  • light e.g. the light of a halogen lamp 2
  • the light of the light source 2 is preferably conducted via a light guide 3 and an optical system 15 in the suspension. Through the optics there is a strong focus, so that the suspension 7 is punctiform illuminated at the coupling point 4 or the light is selectively coupled into the suspension.
  • an atrium or a halo 10 forms in the suspension 7. That is, the light propagates hemispherically around the light exit point 9 or the light entry point 4 in the suspension 7. In the suspension 7, the light is both scattered by the ash particles 12 and fiber particles 1 1 present and absorbed and reflected.
  • the reflections are resumed and directed into a spectrometer system 5.
  • the quantitative and / or qualitative determination of properties and / or ingredients of the suspension 7 then takes place with the aid of the spectrometer system of the light measuring device.
  • FIG. 2 shows the structure of a measuring probe 1, which is connected to the spectrometer system 5 and a light source 2.
  • the measuring probe 1 consists of an encapsulated housing 8, which has at least three passage channels 19, 20 on the front side, wherein the light beam can exit through one of them and the reflected light radiation can reenter through the others.
  • the channels, the first channel 19 and the detection channels 20, are formed by openings in a mask.
  • the end face of the measuring probe consists of a sapphire glass pane 22 and the covering mask 21 applied thereto.
  • the sapphire glass 22 has a thickness of at least 0.1 mm.
  • the inner side of the sapphire glass pane 22 is coated black in order to reduce back reflections, and the mask 21 is made of black material, which is applied as a metallic mask directly onto the sapphire glass pane 22.
  • This mask can be made very thin via a galvano impression.
  • this method allows to very precisely define the structures for the channels 19, 20 via a photo-exposure.
  • the mask can be well coated with so-called camera paint, so that the surfaces have a very low reflection.
  • the light of the light source 2 is directed via an optical waveguide 3 to an optical system 15 and focused by the latter, so that the light is irradiated through the first channel 19, or the coupling-in point 4, at points into the suspension 7.
  • the light spot may have a diameter of 0.1 mm to 2 mm at the coupling-in point.
  • the reflected light is picked up and coupled via a sensor head 16 in light guide 3a and passed to the spectrometer system.
  • the light entry points 17 and the detection channels 20 are, as can be seen in Figure 3, arranged such that the reflected light is recorded at different distances to the coupling point 4 and each directed via separate optical fibers 3a to the spectrometer 5.
  • One or more spectrometer units are accommodated in the spectrometer system 5, so that the light coming from the optical waveguides 3a can each be measured with respect to the distance to the coupling-in point 4 and analyzed in the evaluation electronics.
  • the spectrometer units can have different sensitivities.
  • the measuring probe 1 is immersed in the suspension at least to the extent that at least the Sapphire glass plate 22 is immersed in the suspension.
  • the measuring probe 1 for example, in a pipe 18 or a chest, for the treatment or storage of a suspension, be installed.
  • the measuring probe 1 is thus installed directly at the desired measuring point in the process, so that an inline measurement is made possible.
  • the measured data can be forwarded to the machine control so that the process control or regulation of the pulp web production is improved.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The invention relates to a method and a device for the quantitative detection of properties and/or ingredients of a suspension (7), in particular a fibrous suspension for the paper, tissue or cardboard production. The invention is characterized in that light is introduced into the suspension (7) to be measured by means of a measurement device (1) that comprises at least one light source (2) and a light measurement device, and that the light reflected by the suspension (7) is again absorbed and the absorbed light quantity is quantitatively and/or qualitatively determined. According to the invention, the light is punctually coupled at a coupling point (4) via a first channel into the suspension (7), and the light reflections of the resulting halo (10) are decoupled, measured and analyzed via at least two detection channels.

Description

Verfahren und Vorrichtung zum Bestimmen von Eigenschaften und/oder Inhaltsstoffen einer Suspension  Method and device for determining properties and / or ingredients of a suspension
Die vorliegende Erfindung betrifft ein Verfahren und eine Vorrichtung zur quantitativen Erfassung von Eigenschaften und/oder Inhaltsstoffen einer Suspension, insbesondere einer Faserstoffsuspension für die Papier-, Tissue- oder Kartonbahnproduktion. Für die Papier-, Tissue- oder auch Kartonbahnproduktion wird eine Fasersuspension in einer Faserstoffaufbereitung aufbereitet, anschließend mittels eines Stoffauflaufs auf ein Siebband aufgetragen und so weit entwässert bzw. getrocknet, dass daraus eine Faserstoffbahn entsteht. Zur optimalen Produktionssteuerung und zur Qualitätssicherung ist eine möglichst genaue Kenntnis der Inhaltsstoffe der Fa- sersuspension unerlässlich. The present invention relates to a method and a device for the quantitative detection of properties and / or ingredients of a suspension, in particular a pulp suspension for paper, tissue or board web production. For paper, tissue or also cardboard web production, a fiber suspension is prepared in a pulp preparation, then applied by means of a headbox to a sieve belt and dewatered or dried so that it results in a fibrous web. For optimum production control and quality assurance, the most accurate knowledge possible of the ingredients of the fiber suspension is essential.
Faserstoffsuspensionen enthalten neben den Fasern auch verschiedene Füllstoffe wie Ton, Kalziumkarbonat etc. und verschiedene Chemikalien z.B. zum Bleichen der Fasern oder zur Flockenbildung zwischen den verschiedenen in Suspension befindlichen Substanzen. In der Zellstoff- und Papierindustrie ist insbesondere die Konzentrationsmessung von Faserstoffdichte und Aschegehalt der Faserstoffsuspensionen von zentraler Bedeutung. Pulp suspensions also contain various fillers, such as clay, calcium carbonate, etc., and various chemicals, e.g. for bleaching the fibers or flocculating between the various suspended substances. In the pulp and paper industry, in particular, the concentration measurement of pulp density and ash content of the pulp suspensions is of central importance.
Eine Inline-Messung kann auf verschiedene Weise durchgeführt werden. Es sind aus dem Stand der Technik verschiedene Messverfahren zur Messung von Kon- zentrationen in einer Faserstoffsuspension bekannt. An inline measurement can be done in different ways. Various measuring methods for measuring concentrations in a pulp suspension are known from the prior art.
Für die Bestimmung der Inhaltsstoffe werden, unter anderem, optische Messmethoden verwendet. Im Wesentlichen sind zwei optische Verfahren zur Messung von Stoffdichte und Aschegehalt einer Suspension in einer Maschine zur Herstellung und/oder Veredelung einer Faserstoffbahn bekannt. For the determination of the ingredients, among other things, optical measuring methods are used. Essentially, there are two optical methods for measuring consistency and ash content of a suspension in a machine for manufacturing and / or finishing a fibrous web known.
Bei dem einen Verfahren werden Eigenschaften der Suspension mit Durchlicht, beim anderen Verfahren mit Streulicht, gemessen. In one method, properties of the suspension are measured with transmitted light, in the other method with scattered light.
Bei der Durchlichtmessung wird in der Regel monochromatisch gemessen. Der Sender und der Empfänger sind ca. 1 ,5 bis 3mm voneinander entfernt, sodass die dazwischen befindliche Suspension gemessen werden kann. Beim Durchlichtver- fahren werden salopp gesagt "Schatten" von Partikeln in der Suspension gemessen. Die Durchlichtmessung ist unabhängig von der Partikelart. Aufgrund eines kleinen Messfensters, der Lichtstrahl hat einen Durchmesser zwischen 0,2mm und 0,5mm, ist das Durchlichtmessverfahren stark abhängig vom Flockungsgrad und von der Strömung der Suspension, wodurch Messfehler entstehen können. In the transmitted light measurement is usually measured monochromatically. The transmitter and the receiver are about 1, 5 to 3mm apart so that the suspension in between can be measured. In the transmitted light method, casually, "shadows" of particles in the suspension are measured. The transmitted light measurement is independent of the particle type. Due to a small measuring window, the light beam has a diameter between 0.2mm and 0.5mm, the transmitted light measuring method is strongly dependent on the flocculation and the flow of the suspension, which can lead to measurement errors.
Bei der Streulichtmessung wird das von Partikeln in der Suspension zurückgestreute Licht eines großen, aber Undefinierten Volumenbereichs gemessen. Die Streulichtmessung ist stark abhängig von der Partikelart und deren Streuintensität. So sind beispielsweise Sensoren, basierend auf der Streulichtmessung, bekannt mit denen die Gesamtstoffdichte bis zu einer Stoffdichte bis ca. 4,5% gemessen werden können. Eine getrennte Bestimmung einzelner Bestandteile in der Suspension ist dagegen nur begrenzt möglich. Je nach Konzentration der Inhaltsstoffe muss die Messung in einem Bypass erfolgen. Zudem beeinflusst die Alterung der Lichtquellen die Messung. The scattered light measurement measures the light scattered back from particles in the suspension of a large but undefined volume range. The scattered light measurement is highly dependent on the particle type and its scattering intensity. For example, sensors based on the scattered light measurement are known with which the total material density can be measured up to a substance density of up to approx. 4.5%. Separate determination of individual components in the suspension, however, is limited. Depending on the concentration of the ingredients, the measurement must be done in a bypass. In addition, the aging of the light sources affects the measurement.
Sensoren, die auf der Durchlichtmessung und/oder der Streulichtmessung basieren, wie beispielsweise in der DE 10 2004 051 960 A1 offenbart, reagieren allerdings auch empfindlich auf in der Suspension enthaltene Luftblasen und Faserflocken (Ansammlung aus vielen kleinen Teilchen/Fasern). In der EP 1 653 214 A1 wird ein Verfahren und eine Vorrichtung offenbart, die diese beiden Messverfahren miteinander kombiniert und so zu einem besseren Messergebnis kommt. Es hat sich aber gezeigt, dass die Messung immer noch nicht den Anforderungen genügt. However, sensors based on transmitted light measurement and / or scattered light measurement, as disclosed for example in DE 10 2004 051 960 A1, also react sensitively to air bubbles and fiber flakes contained in the suspension (accumulation of many small particles / fibers). EP 1 653 214 A1 discloses a method and a device which combines these two measuring methods with one another and thus leads to a better measurement result. However, it has been shown that the measurement still does not meet the requirements.
Neben den optischen Verfahren sind auch Messvorrichtungen zur Bypass- oder In- Linemessung bekannt, die die Stoffdichte in einem Suspensionsstrom mittels mechanischer Vorrichtungen messen. Eine derartige Vorrichtung wird beispielsweise in der EP 1 331 480 A1 beschrieben. In addition to optical methods, measuring devices for bypass or Linemessung known that measure the consistency in a suspension stream by means of mechanical devices. Such a device is described for example in EP 1 331 480 A1.
Weitere Ausführungen sind aus den Veröffentlichungen EP 0 740 783 A1 und EP 2 108 1 13 A1 bekannt. Hier wird die Stoffdichte im Suspensionsstrom mittels einer Scherkraftmessung ermittelt. Further embodiments are known from the publications EP 0 740 783 A1 and EP 2 108 1 13 A1. Here, the consistency in the suspension stream is determined by means of a shear force measurement.
Diese Messungen genügen nicht den Anforderungen da hier nur die sogenannte Gesamtstoffdichte, also Faserstoffdichte plus Aschegehalt, gemessen werden kann. These measurements do not meet the requirements since only the so-called total material density, ie fiber density plus ash content, can be measured here.
Aufgabe der Erfindung ist es ein Verfahren und eine Vorrichtung vorzuschlagen, das bzw. die zur In-Linemessung von Faserstoffdichte und Aschegehalt einer Faser- stoffsuspension geeignet ist. The object of the invention is to propose a method and a device which is suitable for in-line measurement of pulp density and ash content of a pulp suspension.
Die Aufgabe wird mittels eines Verfahrens mit den Merkmalen des Anspruches 1 sowie der Vorrichtung mit den Merkmalen nach Anspruch 9 gelöst. The object is achieved by means of a method having the features of claim 1 and the device having the features of claim 9.
Es wird ein Verfahren vorgeschlagen, bei dem mittels einer Messvorrichtung, die zumindest eine Lichtquelle und eine Lichtmessvorrichtung umfast, Licht in die zu vermessende Suspension eingeleitet wird und das durch die Suspension reflektierte Licht aufgenommen und die aufgenommene Lichtmenge quantitativ und/oder qualitativ bestimmt wird. A method is proposed in which light is introduced into the suspension to be measured by means of a measuring device comprising at least one light source and a light measuring device and the light reflected by the suspension is recorded and the quantity of light received is determined quantitatively and / or qualitatively.
Erfindungsgemäß wird das Licht über einen ersten Kanal punktuell an einer Einkop- pelstelle in die Suspension eingekoppelt und die Lichtreflexionen, des sich ergebenden Halos, werden über mindestens zwei Detektionskanäle ausgekoppelt, gemessen und analysiert. According to the invention, the light is coupled into the suspension selectively via a first channel at an injection point and the light reflections of the resulting halo are decoupled, measured and analyzed via at least two detection channels.
Hier wird ausgenutzt, dass eine punktuell in eine Suspension eingeleitete Lichtstrahlung sich in dieser ausbreitet und ein Halo oder auch Lichthof bildet. Die durch die Partikel in der Suspension reflektierte Lichtmenge nimmt mit größer werdendem Abstand zur Einkoppelstelle immer weiter ab. Die Abnahme hängt von der Beschaffenheit und der Anzahl der Partikel ab. Die messbare reflektierte Lichtmenge weiß somit um den ersten Kanal herum an allen Stellen einen anderen Intensitätswert auf. Die Detektionskanäle können deshalb beliebig um die Einkoppelstelle der Lichtstrahlung, dem ersten Kanal, herum angeordnet werden. In einer bevorzugten Ausführung sind die Detektionskanäle mit unterschiedlichem Abstand um die Einkoppelstelle der Lichtstrahlung angeordnet. Zur Verbesserung des Messergebnisses können die Lichtdurchlassquerschnitte der Detektionskanäle mit größer werdendem Abstand zur Einkoppelstelle an die Lichtintensität des reflektierten Lichtes angepasst werden. Here is exploited that a selectively introduced into a suspension light radiation propagates in this and forms a halo or halo. The amount of light reflected by the particles in the suspension decreases as the distance from the coupling point increases. The decrease depends on the nature and the number of particles. The measurable amount of reflected light thus has a different intensity value around the first channel at all points. The detection channels can therefore be arranged arbitrarily around the coupling-in point of the light radiation, the first channel. In a preferred embodiment, the detection channels are arranged at different distances around the coupling-in point of the light radiation. To improve the measurement result, the light transmission cross sections of the detection channels can be adapted to the light intensity of the reflected light with increasing distance to the coupling-in point.
Alternativ dazu kann auch die Messvorrichtung an die schlechter werdenden Lichtverhältnisse angepasst werden. Die Lichtmessvorrichtung kann ein Spektrometersystem sein, mittels dem zumindest eine Eigenschaft und/oder ein Inhaltsstoff durch spektrometrische Analyse der ausgekoppelten Lichtreflexionen gemessen und analysiert wird. Alternatively, the measuring device can be adapted to the deteriorating lighting conditions. The light measuring device may be a spectrometer system, by means of which at least one property and / or an ingredient is measured and analyzed by spectrometric analysis of the coupled-out light reflections.
Dabei können die, durch die Detektionskanäle, ausgekoppelten Lichtreflexionen mittels eines Lichtleitsystems auf das Spektrometersystem geleitet werden, das aus mehreren Spektrometern bestehen kann, die jeweils mit einem Detektionskanal gekoppelt sind. In this case, the, by the detection channels, coupled-out light reflections can be directed by a light guide system on the spectrometer, which may consist of several spectrometers, which are each coupled to a detection channel.
Das Spektrometersystem umfasst eine Auswertelektronik bzw. ist an einen entsprechenden Computer zur Auswertung der Messergebnisse angeschlossen. The spectrometer system comprises an evaluation electronics or is connected to a corresponding computer for the evaluation of the measurement results.
Aus den Messergebnissen kann der reduzierte Streu koeffizient und/oder der spektrale Absorptionskoeffizient bestimmt bzw. berechnet werden. From the measurement results of the reduced scattering coefficient and / or the spectral absorption coefficient can be determined or calculated.
Die berechneten Werte können durch Algorithmen an die Messergebnisse angenähert werden, sodass absolute Werte für den reduzierten Streu koeffizienten und/oder den spektralen Absorptionskoeffizienten bestimmbar sind. The calculated values can be approximated by algorithms to the measurement results so that absolute values for the reduced scattering coefficient and / or the spectral absorption coefficient can be determined.
Der gemessene Verteilungsverlauf wird also mit einem aus Berechnungen simulier- ten Verlauf verglichen. Durch numerisches Verändern des reduzierten Streukoeffizienten und des spektralen Absorptionskoeffizienten wird der berechnete Verlauf dem gemessenen Verlauf angenähert. Sind die Verläufe annähernd deckungsgleich, wird davon ausgegangen, dass das Wertepaar für den reduzierten Streukoeffizienten und den spektralen Absorptionskoeffizienten gefunden ist. Aus den Werten dieser Koeffizienten, bzw. aus deren Veränderung über das gemessene Spektrum, lässt sich die Faserstoffdichte und/oder der Aschegehalt ermitteln. The measured distribution curve is thus compared with a simulation simulated from calculations. By numerically changing the reduced scattering coefficient and the spectral absorption coefficient, the calculated course is approximated to the measured course. If the curves are approximately congruent, it is assumed that the value pair for the reduced scattering coefficient and the spectral absorption coefficient is found. From the values of these coefficients, or from their change over the measured spectrum, the pulp density and / or the ash content can be determined.
Die erfindungsgemäße Vorrichtung umfasst eine Messsonde, zumindest eine Lichtquelle, zur Einkopplung von Licht in die zu vermessende Suspension, und eine Lichtmessvorrichtung, mittels der das durch die Suspension reflektierte Licht aufgenommen und die aufgenommene Lichtmenge quantitativ und/oder qualitativ bestimmbar ist. Die Messsonde weißt eine Abdeckmaske mit einem ersten Kanal, zum Einkoppeln des Lichts in die Suspension an einer Einkoppelstelle, und mindes- tens zwei Detektionskanäle, zum Auskoppeln von Lichtreflexionen aus der Fasersuspension, auf. The device according to the invention comprises a measuring probe, at least one light source, for coupling light into the suspension to be measured, and a light measuring device, by means of which the light reflected by the suspension is recorded and the quantity of light received can be quantitatively and / or qualitatively determined. The probe has a mask with a first channel, for coupling the light into the suspension at a coupling-in point, and at least two detection channels for coupling out light reflections from the fiber suspension.
In einer Ausführungsform sind die Detektionskanäle mit Unterschiedlichem abstand um die Einkoppelstelle des ersten Kanals angeordnet. So können die Detektionskanäle weiterhin radial zur Einkoppelstelle des ersten Kanals oder radial auf einer Linie, von der Einkoppelstelle des ersten Kanals ausgehend, angeordnet sein. In one embodiment, the detection channels are arranged at different distances around the coupling-in point of the first channel. Thus, the detection channels can also be arranged radially to the coupling-in point of the first channel or radially on a line starting from the coupling-in point of the first channel.
Zur besseren Lichtaufnahme können die Detektionskanäle mit größer werdendem Abstand zudem größere Lichtdurchlassquerschnitte aufweisen. For better light absorption, the detection channels can also have larger light transmission cross sections with increasing distance.
Weiterhin wird eine Maschine zur Herstellung einer Faserstoffbahn mit einer entsprechenden Vorrichtung beansprucht. Bevorzugt ist die Messsonde in eine Rohrleitung, durch die ein Suspensionsstrom fliest, und/oder in eine Stoffbütte eingesetzt. Furthermore, a machine for producing a fibrous web is claimed with a corresponding device. The measuring probe is preferably inserted into a pipeline through which a suspension stream flows, and / or into a fabric chest.
Mit der Erfindung wird der Effekt der räumlich spektral aufgelösten Lichtstreuung in vorteilhafter Weise genutzt, um Faserstoffdichte und Aschegehalt in Stoffsuspensionen inline zu ermitteln. Weitere Merkmale und weitere Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines bevorzugten Ausführungsbeispieles unter Bezugnahme auf die Zeichnung. The invention makes use of the effect of the spatially spectrally resolved light scattering in an advantageous manner in order to determine in-line pulp density and ash content in pulp suspensions. Further features and further advantages of the invention will become apparent from the following description of a preferred embodiment with reference to the drawing.
In diesen zeigen: Figur 1 Prinzipskizze des Messsystems In these show: Figure 1 schematic diagram of the measuring system
Figur 2 Aufbau der Messsonde und Funktion des Messverfahrens Figure 2 Structure of the probe and function of the measurement method
Fig. 3a/b Aufbau Stirnseite der Messsonde mit Abdeckmaske Fig. 3a / b Construction Front side of the probe with cover mask
Figur 1 zeigt eine Prinzipskizze des Messsystems. Ziel ist es die Inhaltstoffe der Suspension 7, insbesondere die Faserstoffdichte 1 1 und den Aschegehalt 12 zu ermitteln. Dazu wird in die Suspension 7 Licht, z.B. das Licht einer Halogenlampe 2, eingeleitet. Das Licht der Lichtquelle 2 wird vorzugsweise über einen Lichtleiter 3 und eine Optik 15 in die Suspension geleitet. Durch die Optik erfolgt eine starke Fokussierung, sodass die Suspension 7 an der Einkoppelstelle 4 punktförmig beleuchtet bzw. das Licht in die Suspension punktuell eingekoppelt wird. FIG. 1 shows a schematic diagram of the measuring system. The aim is to determine the contents of the suspension 7, in particular the pulp density 1 1 and the ash content 12. For this purpose, light, e.g. the light of a halogen lamp 2, initiated. The light of the light source 2 is preferably conducted via a light guide 3 and an optical system 15 in the suspension. Through the optics there is a strong focus, so that the suspension 7 is punctiform illuminated at the coupling point 4 or the light is selectively coupled into the suspension.
Durch die punktuelle Beleuchtung bildet sich in der Suspension 7 ein Lichthof bzw. ein Halo 10. Das heißt, das Licht breitet sich halbkugelförmig um den Lichtaustrittspunkt 9 bzw. den Lichteintrittspunkt 4 in der Suspension 7 aus. In der Suspension 7 wird das Licht durch die vorhandenen Ascheteilchen 12 und Faserteilchen 1 1 sowohl gestreut als auch absorbiert und reflektiert. As a result of the selective illumination, an atrium or a halo 10 forms in the suspension 7. That is, the light propagates hemispherically around the light exit point 9 or the light entry point 4 in the suspension 7. In the suspension 7, the light is both scattered by the ash particles 12 and fiber particles 1 1 present and absorbed and reflected.
Mit der Lichtmessvorrichtung werden die Reflexionen wieder aufgenommen und in ein Spektrometersystem 5 geleitet. Mithilfe des Spektrometersystems der Lichtmessvorrichtung erfolgt dann die quantitative und/oder qualitative Bestimmung von Eigenschaften und/oder Inhaltsstoffen der Suspension 7. With the light measuring device, the reflections are resumed and directed into a spectrometer system 5. The quantitative and / or qualitative determination of properties and / or ingredients of the suspension 7 then takes place with the aid of the spectrometer system of the light measuring device.
In Figur 2 ist der Aufbau einer Messsonde 1 gezeigt, die mit dem Spektrometersystem 5 und einer Lichtquelle 2 verbunden ist. Die Messsonde 1 besteht aus einem gekapselten Gehäuse 8, welches an der Stirnseite zumindest drei Durchlasskanäle 19, 20 aufweißt, wobei durch eines der Lichtstrahl austreten und durch die anderen die reflektierte Lichtstrahlung wieder eintreten kann. Die Kanäle, der erste Kanal 19 und die Detektionskanäle 20, werden durch Öffnungen in einer Abdeckmaske gebildet. Wie in Figur 3 dargestellt, besteht die Stirnseite der Messsonde aus einer Saphirglasscheibe 22 und der darauf aufgebrachten Abdeckmaske 21 . Die Saphirglasscheibe 22 hat eine Dicke von mindestens 0,1 mm. Die Innenseite der Saphirglasscheibe 22 ist zur Verminderung von Rückreflexen schwarz beschichtet bzw. die Abdeckmaske 21 besteht aus schwarzem Material, die als metallische Maske direkt auf die Saphirglasscheibe 22 aufgebracht ist. Diese Maske kann über eine Galvano-Abformung sehr dünn hergestellt werden. Außerdem lässt es dieses Verfahren zu, über eine Fotobelichtung sehr genau die Strukturen für die Kanäle 19, 20 definieren. Die Maske lässt sich gut mit sogenanntem Kameralack beschichten, sodass die Oberflächen eine sehr geringe Reflexion aufweisen. FIG. 2 shows the structure of a measuring probe 1, which is connected to the spectrometer system 5 and a light source 2. The measuring probe 1 consists of an encapsulated housing 8, which has at least three passage channels 19, 20 on the front side, wherein the light beam can exit through one of them and the reflected light radiation can reenter through the others. The channels, the first channel 19 and the detection channels 20, are formed by openings in a mask. As shown in FIG. 3, the end face of the measuring probe consists of a sapphire glass pane 22 and the covering mask 21 applied thereto. The sapphire glass 22 has a thickness of at least 0.1 mm. The inner side of the sapphire glass pane 22 is coated black in order to reduce back reflections, and the mask 21 is made of black material, which is applied as a metallic mask directly onto the sapphire glass pane 22. This mask can be made very thin via a galvano impression. In addition, this method allows to very precisely define the structures for the channels 19, 20 via a photo-exposure. The mask can be well coated with so-called camera paint, so that the surfaces have a very low reflection.
Das Licht der Lichtquelle 2 wird über einen Lichtleiter 3 auf eine Optik 15 geleitet und von dieser fokussiert, sodass das Licht durch den ersten Kanal 19, bzw. der Einkoppelstelle 4, punktuell in die Suspension 7 eingestrahlt wird. Der Lichtpunkt kann an der Einkoppelstelle einen Durchmesser von 0,1 mm bis 2mm aufweisen. The light of the light source 2 is directed via an optical waveguide 3 to an optical system 15 and focused by the latter, so that the light is irradiated through the first channel 19, or the coupling-in point 4, at points into the suspension 7. The light spot may have a diameter of 0.1 mm to 2 mm at the coupling-in point.
Durch die Detektionskanäle 20 wird das reflektierte Licht aufgenommen und über einen Sensorkopf 16 in Lichtleiter 3a eingekoppelt und zum Spektrometersystem geleitet. Die Lichteintrittstellen 17 bzw. die Detektionskanäle 20 sind, wie auch in Figur 3 zu erkennen, derart angeordnet, dass das reflektierte Licht in unterschiedlichen Abständen zur Einkoppelstelle 4 aufgenommen und jeweils über getrennte Lichtleiter 3a zum Spektrometersystem 5 geleitet wird. By the detection channels 20, the reflected light is picked up and coupled via a sensor head 16 in light guide 3a and passed to the spectrometer system. The light entry points 17 and the detection channels 20 are, as can be seen in Figure 3, arranged such that the reflected light is recorded at different distances to the coupling point 4 and each directed via separate optical fibers 3a to the spectrometer 5.
Da die reflektierte Lichtmenge mit größer werdendem Abstand stark abnimmt, werden die Durchlassöffnungen mit größer werdendem Abstand zum ersten Kanal 19 immer großer. Since the amount of reflected light decreases sharply as the distance increases, the passage openings become larger and larger with increasing distance to the first channel 19.
Im Spektrometersystem 5 sind einer oder mehrere Spektrometereinheiten untergebracht, sodass das von den Lichtleitern 3a kommende Licht jeweils in Bezug auf den Abstand zum Einkoppelpunkt 4 gemessen und in der Auswertelektronik analysiert werden kann. Die Spektrometereinheiten können unterschiedliche Empfindlichkeiten aufweisen. One or more spectrometer units are accommodated in the spectrometer system 5, so that the light coming from the optical waveguides 3a can each be measured with respect to the distance to the coupling-in point 4 and analyzed in the evaluation electronics. The spectrometer units can have different sensitivities.
Aus dem Stand der Technik sind mehrere Spektrometersysteme 5 bekannt, alle Ausführungen können alternativ verwendet werden. Several spectrometer systems 5 are known from the prior art, all embodiments can alternatively be used.
Zur quantitativen Erfassung von Eigenschaften und/oder Inhaltsstoffen wird die Messsonde 1 zumindest soweit in die Suspension eingetaucht, dass zumindest die Saphirglasscheibe 22 in die Suspension eingetaucht ist. So kann die Messsonde 1 beispielsweise in eine Rohrleitung 18 oder eine Bütte, zur Aufbereitung oder Lagerung einer Suspension, eingebaut werden. Die Messsonde 1 wird also direkt an der gewünschten Messstelle im Prozess eingebaut, sodass eine Inlinemessung ermöglicht wird. For the quantitative detection of properties and / or ingredients, the measuring probe 1 is immersed in the suspension at least to the extent that at least the Sapphire glass plate 22 is immersed in the suspension. Thus, the measuring probe 1, for example, in a pipe 18 or a chest, for the treatment or storage of a suspension, be installed. The measuring probe 1 is thus installed directly at the desired measuring point in the process, so that an inline measurement is made possible.
Die gemessenen Daten können an die Maschinensteuerung weitergeleitet werden, sodass die Prozesssteuerung oder -regelung der Faserstoffbahnherstellung verbessert wird. The measured data can be forwarded to the machine control so that the process control or regulation of the pulp web production is improved.
Bezugszeichenliste LIST OF REFERENCE NUMBERS
Messsonde probe
Lichtquelle  light source
Lichtleiter  optical fiber
Einkoppelstelle  coupling point
Spektrometersystenn  Spektrometersystenn
Auswertelektronik  evaluation system
Suspension  suspension
Gehäuse  casing
Lichtaustritt  light output
Lichthof /Halo  Halo / halo
Fasern  fibers
Ascheteilchen  ash particles
Anbindung an Maschinensteuerung Linse  Connection to machine control lens
Sensorkopf  sensor head
Lichteintritt  light entry
Rohrleitung  pipeline
erster Kanal  first channel
Detektionskanal  detection channel
Abdeckmaske  mask
Saphirglasscheibe  Sapphire glass
25 25

Claims

Patentansprüche Patent claims
1 . Verfahren zur quantitativen Erfassung von Eigenschaften und/oder Inhaltsstoffen einer Suspension (7), insbesondere einer Faserstoffsuspension für die Papier-, Tissue- oder Kartonbahnherstellung, mittels einer Messvorrichtung, die zumindest eine Lichtquelle (2) und eine Lichtmessvorrichtung (5) umfast, wobei Licht in die zu vermessende Suspension (7) eingeleitet wird und das durch die Suspension (7) reflektierte Licht aufgenommen und die aufgenommene Lichtmenge quantitativ und/oder qualitativ bestimmt wird, dadurch gekennzeichnet, 1 . Method for the quantitative detection of properties and/or ingredients of a suspension (7), in particular a fiber suspension for paper, tissue or cardboard web production, by means of a measuring device which comprises at least one light source (2) and a light measuring device (5), wherein light is introduced into the suspension (7) to be measured and the light reflected by the suspension (7) is recorded and the amount of light recorded is determined quantitatively and/or qualitatively, characterized in that
dass das Licht über einen ersten Kanal (19) punktuell an einer Einkoppelstelle (4) in die Suspension (7) eingekoppelt wird und die Lichtreflexionen, des sich ergebenden Halos (10), über mindestens zwei Detektionskanale (20) ausgekoppelt, gemessen und analysiert werden. that the light is coupled into the suspension (7) at a point at a coupling point (4) via a first channel (19) and the light reflections of the resulting halo (10) are coupled out, measured and analyzed via at least two detection channels (20). .
2. Verfahren nach Anspruch 1 , 2. Method according to claim 1,
dadurch gekennzeichnet, characterized,
dass die Detektionskanale (20) um die Einkoppelstelle (4) der Lichtstrahlung angeordnet sind. that the detection channels (20) are arranged around the coupling point (4) of the light radiation.
3. Verfahren nach Anspruch 2, 3. Method according to claim 2,
dadurch gekennzeichnet, characterized,
dass die Detektionskanale (20) mit unterschiedlichem Abstand um die Einkoppelstelle (4) der Lichtstrahlung angeordnet sind. that the detection channels (20) are arranged at different distances around the coupling point (4) of the light radiation.
4. Verfahren nach Anspruch 3, 4. Method according to claim 3,
dadurch gekennzeichnet, characterized,
dass die Lichtdurchlassquerschnitte der Detektionskanale (20) mit größer werdendem Abstand zur Einkoppelstelle (4) an die Lichtintensität des reflektierten Lichtes angepasst sind. that the light transmission cross sections of the detection channels (20) are adapted to the light intensity of the reflected light as the distance to the coupling point (4) increases.
Verfahren nach einem der vorangehenden Ansprüche, Method according to one of the preceding claims,
dadurch gekennzeichnet, characterized,
dass die Lichtmessvorrichtung ein Spektrometersystem (5) umfasst, mittels dem zumindest eine Eigenschaft und/oder ein Inhaltsstoff durch spektromet- rische Analyse der ausgekoppelten Lichtreflexionen gemessen und analysiert wird. in that the light measuring device comprises a spectrometer system (5), by means of which at least one property and/or an ingredient is measured and analyzed by spectrometric analysis of the coupled-out light reflections.
Verfahren nach Anspruch 5, Method according to claim 5,
dadurch gekennzeichnet, characterized,
dass die durch die Detektionskanäle (20) ausgekoppelten Lichtreflexionen mittels eines Lichtleitsystems auf das Spektrometersystem (5) geleitet werden. that the light reflections coupled out through the detection channels (20) are guided to the spectrometer system (5) by means of a light guide system.
Verfahren nach einem der vorangehenden Ansprüche, Method according to one of the preceding claims,
dadurch gekennzeichnet, characterized,
dass aus den Messergebnissen der reduzierte Streu koeffizient und/oder der spektrale Absorptionskoeffizient bestimmt wird. that the reduced scattering coefficient and/or the spectral absorption coefficient is determined from the measurement results.
Verfahren nach Anspruch 7, Method according to claim 7,
dadurch gekennzeichnet, characterized,
dass berechnete Werte durch Algorithmen an die Messergebnisse angenähert werden, sodass absolute Werte für den reduzierten Streu koeffizienten und/oder den spektralen Absorptionskoeffizienten bestimmbar sind. that calculated values are approximated to the measurement results using algorithms, so that absolute values for the reduced scattering coefficient and/or the spectral absorption coefficient can be determined.
Vorrichtung zur quantitativen Erfassung von Eigenschaften und/oder Inhaltsstoffen einer Suspension (7), insbesondere einer Faserstoffsuspension für die Papier-, Tissue- oder Kartonherstellung, umfassend eine Messsonde (1 ), zumindest eine Lichtquelle (2), zur Einkopplung von Licht in die zu vermessende Suspension (7), und eine Lichtmessvorrichtung, mittels der das durch die Suspension (7) reflektierte Licht aufgenommen und die aufgenommene Lichtmenge quantitativ und/oder qualitativ bestimmbar ist, Device for the quantitative detection of properties and/or ingredients of a suspension (7), in particular a fiber suspension for paper, tissue or cardboard production, comprising a measuring probe (1), at least one light source (2), for coupling light into the measuring suspension (7), and a light measuring device, by means of which the light reflected by the suspension (7) is recorded and the amount of light recorded can be determined quantitatively and/or qualitatively,
dadurch gekennzeichnet, dass die Messsonde (1 ) eine Abdeckmaske (21 ) mit einem ersten Kanal (19), zum Einkoppeln des Lichts in die Suspension (7) an einer Einkoppelstelle (4), und mindestens zwei Detektionskanale (20), zum Auskoppeln von Lichtreflexionen aus der Fasersuspension, aufweist. characterized, that the measuring probe (1) has a cover mask (21) with a first channel (19) for coupling the light into the suspension (7) at a coupling point (4), and at least two detection channels (20) for coupling out light reflections from the Fiber suspension.
10. Vorrichtung nach Anspruch 9, 10. Device according to claim 9,
dadurch gekennzeichnet, characterized,
dass die Detektionskanale (20) mit unterschiedlichem Abstand zur Einkoppelstelle (4) des ersten Kanals (19) angeordnet sind. that the detection channels (20) are arranged at different distances from the coupling point (4) of the first channel (19).
1 1 . Vorrichtung nach Anspruch 10, 1 1 . Device according to claim 10,
dadurch gekennzeichnet, characterized,
dass die Detektionskanale (20) radial auf einer Linie, von der Einkoppelstelle (4) des ersten Kanals (19) ausgehend, angeordnet sind. that the detection channels (20) are arranged radially on a line starting from the coupling point (4) of the first channel (19).
12. Vorrichtung nach Anspruch 1 1 , 12. Device according to claim 1 1,
dadurch gekennzeichnet, characterized,
dass die Detektionskanale (20) mit größer werdendem Abstand größere Lichtdurchlassquerschnitte aufweisen. that the detection channels (20) have larger light transmission cross sections as the distance increases.
13. Vorrichtung nach Anspruch 9, 13. Device according to claim 9,
dadurch gekennzeichnet, characterized,
dass die Lichtmessvorrichtung ein Spektrometersystem (5) umfasst. that the light measuring device comprises a spectrometer system (5).
14. Vorrichtung nach Anspruch 13, 14. Device according to claim 13,
dadurch gekennzeichnet, characterized,
dass das Spektrometersystem (5) mehrere Spektrometereinheiten umfasst, wobei jeder Spektrometereinheit ein Detektionskanal zugeordnet ist und die Detektionskanale (20) über Lichtleiter mit den Spektrometereinheiten verbunden sind, die das Reflexionslicht von den Detektionskanälen (20) zu den Spektrometereinheiten 5 leiten. in that the spectrometer system (5) comprises several spectrometer units, each spectrometer unit being assigned a detection channel and the detection channels (20) being connected to the spectrometer units via light guides, which guide the reflected light from the detection channels (20) to the spectrometer units 5.
15. Maschine zur Herstellung einer Faserstoffbahn umfassend eine Vorrichtung nach einem der Ansprüche 9 bis 14. 15. Machine for producing a fibrous web comprising a device according to one of claims 9 to 14.
16. Maschine nach Anspruch 13, 16. Machine according to claim 13,
dadurch gekennzeichnet, characterized,
dass die Messsonde (1 ) in eine Rohrleitung (18), durch die ein Suspensionsstrom (7) fliest, und/oder in eine Stoffbütte eingesetzt ist. that the measuring probe (1) is inserted into a pipeline (18) through which a suspension stream (7) flows, and/or into a fabric chest.
PCT/EP2013/066960 2012-09-20 2013-08-14 Method and device for determining properties and/or ingredients of a suspension WO2014044473A1 (en)

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