CN110243774A - For measuring the method and measuring device of suspension - Google Patents

For measuring the method and measuring device of suspension Download PDF

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Publication number
CN110243774A
CN110243774A CN201910172975.5A CN201910172975A CN110243774A CN 110243774 A CN110243774 A CN 110243774A CN 201910172975 A CN201910172975 A CN 201910172975A CN 110243774 A CN110243774 A CN 110243774A
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China
Prior art keywords
optical
suspension
concentration
intensity
radiation
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Granted
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CN201910172975.5A
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CN110243774B (en
Inventor
P·凯尔基
M·特尔梅宁
M·哈帕莱宁
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Valmet Automation Oy
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Metso Automation Oy
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    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/34—Paper
    • G01N33/343—Paper pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • 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
    • 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
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
    • 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
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N21/474—Details of optical heads therefor, e.g. using optical fibres
    • 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
    • G01N21/51—Scattering, i.e. diffuse reflection within a body or fluid inside a container, e.g. in an ampoule
    • 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
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • 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
    • G01N21/84—Systems specially adapted for particular applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
    • H04B1/0028—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at baseband stage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C7/00—Digesters
    • D21C7/12—Devices for regulating or controlling
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/78—Controlling or regulating not limited to any particular process or apparatus
    • 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
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N2021/3196—Correlating located peaks in spectrum with reference data, e.g. fingerprint data
    • 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
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N21/474—Details of optical heads therefor, e.g. using optical fibres
    • G01N2021/4742—Details of optical heads therefor, e.g. using optical fibres comprising optical fibres
    • 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
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N2021/4764—Special kinds of physical applications
    • G01N2021/4769—Fluid samples, e.g. slurries, granulates; Compressible powdery of fibrous samples
    • 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
    • G01N21/84—Systems specially adapted for particular applications
    • G01N2021/8405—Application to two-phase or mixed materials, e.g. gas dissolved in liquids
    • 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
    • G01N21/84—Systems specially adapted for particular applications
    • G01N2021/8411—Application to online plant, process monitoring
    • 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
    • G01N21/84—Systems specially adapted for particular applications
    • G01N2021/8444—Fibrous material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/06—Illumination; Optics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/30—Circuits for homodyne or synchrodyne receivers
    • H04B2001/305—Circuits for homodyne or synchrodyne receivers using dc offset compensation techniques

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  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Pathology (AREA)
  • Immunology (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Medicinal Chemistry (AREA)
  • Food Science & Technology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Wood Science & Technology (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

The method of suspension the present invention relates to measurement comprising wood-fibred.Change the concentration (100) of suspension in concentration range.It will use the optical radiation of the first optical wavelength and the second optical wavelength guidance at suspension (102).The first intensity value and the second intensity value relevant with the second optical wavelength (104) of optical radiation relevant to the first optical wavelength are determined at least one given concentration value.Determine the ratio (106) of the first intensity value and the second intensity value.Determine the Kappa number (108) of suspension.By the way that predetermined factor to be applied to the ratio of the first intensity value and the second intensity value, the original value (110) of hexenuronic acid HexA is obtained.By that will determine that ratio is multiplied with Kappa number, the content (112) of HexA in suspension is determined.

Description

For measuring the method and measuring device of suspension
Technical field
Exemplary and non-limiting embodiment of the invention is usually directed to the measurement of wood-fibred suspension.
Background technique
To background technique be described below the prior art before may include the present invention it is unknown but by the present invention provide Opinion, discovery, understanding or openly or with open contacting together.Some such contributions of the invention refer specifically to below Out, the such contribution of other of the invention will be apparent according to their context.
In paper and pulp manufacture, it is therefore an objective to obtain that quality is good and the final products of uniform quality.In order to ensure quality, It measures in the fabrication process.For example, the lignin content of measurement paper pulp.The lignin content of the suspension of such as paper pulp is usually used Kappa number (kappa number) indicates.In pulp manufacture field in known standard SCAN-C 1:77, Kappa number is defined For under conditions of being limited with standard, concentration consumed by 1 gram of dry pulp is that the milliliter of the liquor potassic permanganate of 20mmol/l is used Amount.
Another substance is hexenuronic acid (being typically expressed as HexA), and the content in paper pulp is to technique and final production Product have an impact.
The HexA content that known method measures paper pulp in laboratory environment can be used.However, laboratory measurement is that have Problem, because they usually require to spend time (from 30 minutes to a few hours), however in a manufacturing environment, it should in difference Operation stage be quickly obtained as a result, so as to controlling manufacturing process based on measurement result.It can be therefore, it is necessary to one kind The solution of HexA content is monitored during fabrication stage.
Summary of the invention
It is an object of the present invention to provide a kind of improved methods and a kind of equipment for realizing this method, to reduce or keep away Exempt from the above problem.
The purpose of the present invention realized by a kind of method of suspension of the measurement comprising wood-fibred, this method comprises: Change the concentration of suspension in concentration range；The optical radiation of the first optical wavelength and the second optical wavelength guidance will be used outstanding At supernatant liquid；The light relevant to the first optical wavelength in concentration range is measured and determined at least one given concentration value Learn the first intensity value and the second intensity value relevant to the second optical wavelength of radiation；Determine the first intensity value and the second intensity value Ratio；Determine the Kappa number of suspension；By the way that predetermined factor to be applied to the ratio of the first intensity value and the second intensity value, obtain Obtain the original value of hexenuronic acid HexA；And by the way that original value is multiplied with Kappa number, determine hexenuronic acid in suspension The content of HexA.
The purpose of the present invention by it is a kind of for measuring include that the measuring device of suspension of wood-fibred is realized, the measurement Equipment includes for optical radiation to be guided to one or more optical power sources at suspension and is used to measure and suspend At least one optical measurement sensors of the optical radiation of liquid phase interaction, the measuring device are arranged such that in concentration range Change the concentration of suspension；It will use the optical radiation of the first optical wavelength and the second optical wavelength guidance at suspension；Needle To at least one given concentration value measurement and determine the of optical radiation relevant to the first optical wavelength in concentration range One intensity value and the second intensity value relevant to the second optical wavelength；Determine the ratio of the first intensity value and the second intensity value；Really Determine the Kappa number of suspension；By the way that predetermined factor to be applied to the ratio of the first intensity value and the second intensity value, glucal is obtained The original value of aldehydic acid HexA；And by the way that the ratio determined is multiplied with Kappa number, determine the hexenuronic acid in suspension The content of HexA.
It will be described some embodiments of the present invention below.
Detailed description of the invention
Hereinafter, will by means of preferred embodiment, the present invention will be described in more detail with reference to attached drawing, wherein
Fig. 1 is the exemplary flow chart for showing the embodiment of the present invention；
Fig. 2 shows the examples of measuring device according to the embodiment；
Fig. 3 shows the example of measuring device；
Fig. 4 A, Fig. 4 B and Fig. 4 C show the example of measuring device；
Fig. 5 A and Fig. 5 B show the example of measurement result；
Fig. 6 shows the calibration of measuring device；
Fig. 7 shows the example for being configured to act as the equipment of Mersure Controler；And
Fig. 8 shows the example of measuring device according to the embodiment.
Specific embodiment
It is particularly suitable for suspension of the measurement containing wood-fibred according to the solution of the present invention, but is not limited to this.
In this application, " optical radiation " refers to that wavelength is about the electromagnetic radiation of 40nm to 1mm, and " ultraviolet radioactive " refers to wave Long is about the electromagnetic radiation of 40nm to 400nm.
In the scheme proposed, the suspension containing wood-fibred is exposed to optical radiation, and measures radiation and suspends The interaction of liquid, at the same in measurement process change suspension concentration.
Fig. 1 is the exemplary flow chart for showing the embodiment of the present invention, wherein suspension of the measurement containing wood-fibred.
In step 100, change the concentration of suspension in concentration range.In one embodiment, concentration range is from first Beginning concentration expands to ultimate density.
In a step 102, the optical radiation of the first optical wavelength λ 1 and the second optical wavelength λ 2 guidance will be used to suspend At liquid.In one embodiment, the first optical wavelength is 235nm ± 50nm, and the second optical wavelength is 280nm ± 50nm.
At step 104, for related to the first optical wavelength at least one given concentration value measurement concentration range Optical radiation the first intensity value and the second intensity value relevant to the second optical wavelength.
In step 106, the ratio of the first intensity value and the second intensity value is determined.Therefore, acquisition value I λ 1 and I λ 2.
Therefore, in one embodiment, for given concentration value using two different wavelength come measurement intensity value.Really The ratio of these fixed intensity.
In another embodiment, change the concentration of suspension, so that concentration is continually by all in concentration range Concentration.
The intensity with the optical radiation of suspension interaction is measured at various concentration in concentration range.It determines and the The maximum intensity of one optical wavelength and the relevant optical radiation of the second optical wavelength, and determination is relevant to the first optical wavelength The ratio of the maximum intensity of optical radiation and the maximum intensity of optical radiation relevant to the second optical wavelength.Therefore, acquisition value I λ 1max and I λ 2max.
Therefore, when the concentration of suspension becomes ultimate density from initial concentration, using first wave length and second wave length with Given interval duplicate measurements.Interval can be measurement parameter.Therefore, the intensity I λ 1 and the second light of the first optical wavelength λ 1 are obtained Learn the value of the intensity I λ 2 of wavelength X 2.
In one embodiment, optical radiation is guided to suspension using one or more optical power sources.For example, function Rate source can be used for each wavelength, perhaps can change the wavelength by the radiation of source output or uses filter selective radiation Wavelength.
With the intensity of the measurement of one or more optical measurement sensors and the optical radiation of suspension interaction, optics is surveyed Quantity sensor gives set a distance with given surface area and away from one or more optical power sources.
In one embodiment, given surface area and distance are selected based on concentration range and required intensive quantity.
In one embodiment, the first optical wavelength and the second optical wavelength are within the scope of UV radiation wavelength.
In step 108, the Kappa number of suspension is determined.
Determine that Kappa number K there are various ways.In one embodiment, based on identified maximum intensity value I λ 1max, I λ One or two of 2max determines the Kappa number of suspension.However, any determining suspension Kappa also can be used here The art methods of value.
In step 110, it by the way that predetermined factor to be applied to determining ratio I λ 1/I λ 2 or I λ 1max/I λ 2max, obtains The original value HexARaw of hexenuronic acid.With predetermined value calibration measurement result.Illustrate to obtain showing for predetermined value below with reference to Fig. 6 Example.
In step 112, containing for hexenuronic acid HexA in suspension is determined by the way that original value is multiplied with Kappa number Amount.To,
HexA=K*HexARaw or HexA=K*HexARaw.
HexA content in paper pulp may have an impact to Kappa measurement.HexA and lignin have different property, and Different effects is generated in the bleaching of manufacturing process.Therefore, it is known that HexA content is critically important.The oxidation stage of manufacturing process, HexA content will not be reduced with lignin content.ClO is used in a manufacturing process2HexA and lignin can be reduced, but due to ClO2 High cost, so ClO2It is not the good selection for removing HexA, because there is cheaper substance that can remove HexA.
Next, reference Fig. 2 to be described to the example of the measuring device of embodiment, Fig. 2 shows the present invention in paper pulp and to make Application in paper industry.
Fig. 2 shows pipelines 200, and the suspension 202 (i.e. wood-fibred paper pulp) comprising wood-fibred is flowed in pipeline 200.With Sampler 204 takes out suspension sample from pipeline 200.Sampler 204 can be scheme known per se, for example, it is based on living Plug and cylinder.Using pipeline 206 by sample delivery to measuring chamber 208, valve 210 is closed.
The suspension in measuring chamber can be handled before measuring.It is, for example, possible to use forced airs to filter liquid.Valve 212 can open, and be pressed sample to wire 214 by the air of valve, liquid flows through valve 216.
Water and air cleaning sample can be used by opening valve 212 and 218, waste water flows through valve 216.
When sample clean is completed, sample can be mixed by using the forced air by valve 220 and by valve 222 Water is added to start measurement process.When sample, which mixes, to be completed, air valve 220 is closed.Water valve 222 is still opened.Pass through the water of valve The concentration of sample is changed, while being mixed with sample.The concentration of suspension changes in concentration range.In one embodiment, Concentration range expands to ultimate density from initial concentration.
During sample concentration changes, measured using measuring device 224,226, measuring device 224,226 can lead to Mersure Controler 228 is crossed to control.In one embodiment, measuring device include source and detector elements 226 and optical fiber and Measure head part 224.
Fig. 3 and Fig. 4 A to Fig. 4 C shows the example of measuring device 224,226.In one embodiment, which includes One or more optical power sources 300.For the sake of simplicity, a source is illustrated only in Fig. 3.Measurement usually under ultraviolet light into Row, therefore, optical power source can typically at least emit ultraviolet light.For example, source 300 can be xenon lamp or LED (light-emitting diodes Pipe).Optical power source can be configured to guide optical radiation at suspension.In one embodiment, using the first optical fiber 306 direct radiation to suspension.First optical fiber 306 can be configured as by optical radiation guidance at suspension, optical fiber First end is connected to optical light source 300, and the second end of optical fiber is located at measuring head and is inserted into measuring chamber 208.
In one embodiment, which further includes one or more detectors 302,304, is arranged to measurement and hangs The intensity of the optical radiation of supernatant liquid interaction.In one embodiment, each detector is connected to one group of optical fiber 308,310, The end of optical fiber is positioned by the second end of the first optical fiber 306.
Fig. 4 A to Fig. 4 C shows the example of the fiber arrangement in measuring head 312, and measuring chamber can be inserted in measuring head 312 In 208.
Fig. 4 A shows one embodiment, wherein measuring device includes being connected to the optical power source of the first optical fiber 306 300 and it is connected to the detector 302 of optical fiber 308.At measuring head, the first optical fiber 306 and optical fiber 308 are arranged side by side, each other phase Away to set a distance 400.
Fig. 4 B shows another embodiment, wherein measuring device includes being connected to the optical power source of the first optical fiber 306 300 and it is connected to the detector 302 of one group of optical fiber 308.At measuring head, the end of optical fiber 308 is close to the end of the first optical fiber 306 Portion's positioning gives set a distance 402 at a distance of identical with the first optical fiber.
Fig. 4 C shows another embodiment, wherein measuring device includes being connected to the optical power source of the first optical fiber 306 300 and it is connected to the detector 302,304 of one group of optical fiber 308,310.At measuring head, the end of optical fiber 308 is close to the first light The end positioning of fibre 306 gives set a distance 404 at a distance of equal with the first optical fiber, and the end of optical fiber 310 is close to the first optical fiber 306 end positioning gives set a distance 406 at a distance of equal with the first optical fiber.
In one embodiment, measuring chamber 208 includes the window 230 in the wall of measuring chamber.Optical power source 300 connects The first optical fiber 306 for being connected to source can be placed in outside measuring chamber behind window, for guiding optical radiation in suspension Place.
Similarly, one or more detectors 302,304 or be connected to the optical fiber 308,310 of detector can be in measuring chamber It is placed in outside measuring chamber behind window 230 in wall.
The use of above-mentioned optical fiber is only example.Measurement can also be realized in the case where no optical fiber.Implement at one In example, optical radiation is directed to measuring chamber using such as lens, waveguide or the radiation conductor of any suitable media.For example, light Source and detector can be placed on behind window 230 without the use of any optical fiber.
Fig. 5 A and Fig. 5 B show the example of measurement result, that is, are using the first optical wavelength and the second optical wavelength benefit Measurement result when with the optical emission intensities to interact at above-mentioned measuring device measurement various concentration with suspension.In Fig. 5 A In the non-limiting example of Fig. 5 B, the first optical wavelength is 235nm, and the second optical wavelength is 280nm.According to embodiment, wave Length can change such as ± 50nm.
Fig. 5 A shows the measurement carried out using the first optical wavelength 235nm.Concentration is in x-axis 500 in the figure, measurement Intensity in y-axis 502.Fig. 5 B shows the measurement carried out using the second optical wavelength 280nm.Concentration is in x-axis in the figure On 504, the intensity of measurement is in y-axis 506.The concentration of suspension sample changes according to concentration.In general, suspending when starting The concentration of liquid is big, and as more water are mixed with sample, the concentration of suspension is lower.
Change the concentration of suspension sample in measurement process.Fig. 5 A and Fig. 5 B show concentration in x-axis, wherein small Concentration value in left side, and higher concentration value is on right side.During actual measurement, concentration is very big when beginning, and with The addition of water, concentration can reduce.
When the optical radiation in optical power source is directed into the sample of suspension, partial radiation scatters to inspection from wood-fibred Survey device, partial dispersion is to elsewhere and part absorbs in lignin.At a time, as concentration changes, for measurement Intensity there are maximum values 508,510.Measuring device can be configured as the maximum value for the intensity that detection is detected by detector 508、510。
The concentration for reaching maximum intensity depends on absorbing.Absorption is more, and the concentration for maximum intensity occur is smaller.
In one embodiment, the initial concentration of concentration range measurement depends on the property of suspension.Measurement continues always To detecting maximum intensity, and when the intensity of measurement terminates measurement when starting to become smaller after maximum value.
In one embodiment, by executing calibration measurement come calibrating measuring device so that measuring device is correctly run.It can These measurements are executed to use the normative references plate being placed on before measuring device.In one embodiment, using reference Paper pulp is calibrated.It needs to calibrate and need to be calibrated every now and then before actually using measuring device, because of such as light The path of radiation may change or detector response may change over time.It is wood-fibred paper pulp, property with reference to paper pulp Matter measures in the lab and stablizes relative to the time.Reference paper pulp on sale for calibration measurement equipment on the market, example Such as, the Paprican canonical reference paper pulp 5-96 from Canadian manufacturer.
In one embodiment, light source and detector are selected according to the concentration range of suspension and required intensive quantity Surface area and numerical aperture.
In one embodiment, selected according to the concentration range of suspension and required intensive quantity distance 400,402,404, 406 and optical fiber or optical fiber group 306,308 and 310 cross section surface area and numerical aperture.
The surface area of the cross section of distance 400,402,404,406 and optical fiber or optical fiber group 306,308 hereinafter indicates For measure geometry shape.Measure geometry shape is related to concentration range.When a measurement is taken, the concentration of suspension must make it possible to Carry out sample treatment (cleaning sample and change concentration).If the concentration of suspension is too big, sample treatment may not succeed. On the other hand, if concentration is too low, measuring dynamics will receive influence.The available light intensity of optical light source also has shadow to measurement It rings.When measuring Kappa number, Kappa number is bigger, and the light that the lignin in sample absorbs is more.
In one embodiment, it is therefore an objective to maximum of the detection in concentration range with the optical radiation of suspension interaction Intensity.The concentration for reaching maximum intensity is likely to be dependent on following problems:
The distance between optical power source and measurement point 400,402,404,406, i.e., the end of the first optical fiber 306 and its The distance between the end of his optical fiber 306,308.Distance is bigger, and concentration when there is maximum intensity is smaller.
The surface area in optical power source and measurement point.Surface area is bigger, and concentration when there is maximum intensity is smaller.
The Kappa number of sample.Kappa number is bigger, and concentration when there is maximum intensity is smaller.
The radiation wavelength of optical power source output.The absorption radiated in suspension depends on wavelength.Absorb more, appearance Concentration when maximum intensity is smaller.
The granularity of suspension sample.Particle is smaller, and concentration when there is maximum intensity is smaller.
Therefore, in one embodiment, measurement parameter may include concentration range, measure geometry shape used in measurement Shape, optical radiation wavelength.
In addition, concentration range depends on the property of suspension.For example, when measuring pine suspension, concentration range can be with It is 0.3-0.1%, when measuring birch suspension, concentration range can be 0.4-0.2%.These numerical value, which are only non-limited, to be shown Example.
The representative value of fibre diameter is about several hundred μm, but other values also can be used according to property to be measured.
In general, light source and the detector discussed above of being also applied for uses some other suitable media to connect without using optical fiber The case where being connected to measuring chamber.
In one embodiment, as above in conjunction with Figure 1, optical radiation relevant with the first optical wavelength is determined most Big intensity to and the relevant optical radiation of the second optical wavelength maximum intensity ratio I λ 1max/I λ 2max.
Fig. 8 shows the embodiment of measuring device.In this example, the measurement intensity value in measuring chamber.Measuring device packet Include the measuring chamber 800 of the suspension given with concentration.The device includes one or more light sources 802,804.Implement at one In example, for example, light source (such as xenon light source) can emit the light with multiple wavelength.In one embodiment, for each wave It is long to may exist light source.The example of single wavelength light source is LED.The device further includes one or more detectors 806,808.One In a embodiment, detector may include the only filter by setted wavelength.Filter can be variable.This is especially suitable In light source emit multiple wavelength the case where.In one embodiment, it in the case where light source only emits a wavelength, does not need to filter Wave device.
In addition, determining the Kappa number of suspension.In one embodiment, based on identified maximum intensity value I λ 1max, I One or two of λ 2max determines the Kappa number of suspension.However, also can be used here any for determining suspension Kappa number art methods.
When having confirmed the ratio and Kappa number of the first intensity value and the second intensity value, the value of HexA can be determined. For calibration measurement as a result, predetermined factor is applied to the ratio, and obtain so-called original HexA value.Pass through original HexA value It is multiplied to obtain the HexA value as unit of umol/g with Kappa number.
Fig. 6 shows the example of determining predetermined factor.In certainty factor, change the concentration of suspension and in two waves Measurement intensity under long (being in this embodiment 235 and 280nm).The measured sample of intensity value is also brought to laboratory, is The premise of Kappa number and HexA value is determined using laboratory procedure.Therefore, for each intensity value ratio, there are laboratory HexA and Kappa number can be expressed as HexALAB and KappaLAB.Fig. 6 illustrate ratio HexALAB/KappaLAB and intensity value it The functional relation of ratio.As can be seen that in this example, which follows power function.
In general type, power function can be expressed as y=axb, wherein y=HexALAB/KappaLAB, x=I λ 1/I λ 2, and wherein, variable a and b are predetermined factors.
In the specific example of Fig. 6, power function is y=0.6561x-1.402。
Therefore, when the relationship follows above-mentioned power function, RawHexA value can be obtained from the intensity value ratio of measurement, such as Under
RawHexA=a* (I λ 1/I λ 2)bOr RawHexA=a* (I λ 1max/I λ 2max)b。
Here power function is used only as example.According to circumstances, which is also possible to linear function or polynomial function, or By some other functions of the rate maps of intensity value to ratio HexALAB/KappaLAB.
Typically for each measuring device, if the configuration of equipment or suspension type are (for example, from a kind of tree-shaped to another A kind of tree-shaped) do not change, then only need to carry out the determination of a predetermined factor.In one embodiment, measurement knot can be used Fruit checks the correctness of the factor every now and then.
Fig. 7 shows one embodiment.The figure shows the simplification for the equipment for being configured for use as Mersure Controler 228 to show Example.
It should be understood that the equipment is described as showing the example of some embodiments herein.For this field skill Art personnel are it is readily apparent that the equipment can also include other function and/or structure, and not need be described function And structure.Although the equipment has been depicted as an entity, it is different module and memory can be in one or more object It is realized in reason or logic entity.
The exemplary equipment 228 includes control circuit 700, is configured as at least partly operation of control device.
The equipment may include memory 702 for storing data.In addition, can store can be by control circuit for memory 700 softwares 704 executed.Memory can integrate in control circuit.
The equipment can also include interface circuit 706, be configured as the equipment being connected to other equipment.Interface can be with It provides wired or is wirelessly connected.The equipment can be connected to measuring device 224,226 by interface.In one embodiment, this sets It is standby to may be coupled to the automatic process control computer being used in manufacture paper pulp.
For example, the equipment can also include user interface 708 (such as display, keyboard and mouse).In one embodiment In, which does not include user interface, and is attached to provide the other equipment to equipment access.
In some embodiments, the equipment can with small-sized or microcomputer, personal computer or laptop or Any suitable calculating equipment is realized.
In one embodiment, different measure geometry shapes can be used and execute ionization meter in identical measuring chamber It is measured with Kappa.For example, a detector can measure Kappa number and other intensity in the scheme of Fig. 4 C.
It will be apparent to those skilled in the art that present inventive concept can come real in various ways as technology develops It is existing.The present invention and embodiment are not limited to above-mentioned example, but can change within the scope of the claims.

Claims (17)

1. a kind of method for measuring the suspension containing wood-fibred, which comprises
Change the concentration of suspension in concentration range；
It will use the optical radiation of the first optical wavelength and the second optical wavelength guidance at suspension；
The optics relevant to the first optical wavelength in concentration range is measured and determined at least one given concentration value The first intensity value and the second intensity value relevant to the second optical wavelength of radiation；
Determine the ratio of the first intensity value and the second intensity value；
Determine the Kappa number of suspension；
By the way that predetermined factor to be applied to the ratio of the first intensity value and the second intensity value, the original of hexenuronic acid HexA is obtained Value；And
By the way that original value is multiplied with Kappa number, the content of hexenuronic acid HexA in suspension is determined.
2. according to the method described in claim 1, further include:
Optical radiation is directed to suspension using optical power source；And
With one or more optical measurement sensors measurement with suspension interaction optical radiation intensity, it is one or Multiple optical measurement sensors have given surface area, numerical aperture and the distance away from optical power source.
3. method according to claim 1 or 2, wherein the first optical wavelength and the second optical wavelength are in ultraviolet radiation In wave-length coverage.
4. the method according to any one of preceding claims 1 to 3, wherein the first optical wavelength is 235nm ± 50nm, And the second optical wavelength is 280nm ± 50nm.
5. the method according to any one of preceding claims 1 to 4, further includes:
The concentration for changing suspension, so that concentration is continually by all concentration in concentration range；
The intensity with the optical radiation of suspension interaction is measured at various concentration in concentration range；
Determine the maximum intensity of optical radiation relevant to the first optical wavelength and the second optical wavelength；And
Determine the maximum intensity and optical radiation relevant with the second optical wavelength of optical radiation relevant to the first optical wavelength Maximum intensity ratio.
6. the method according to any one of preceding claims 1 to 5, further includes:
The sample of suspension to be measured is put into uninflated measuring chamber.
7. the method according to any one of preceding claims 1 to 6, further includes:
Optical radiation is guided at suspension using the first optical fiber with given diameter and numerical aperture；And
With the intensity of the optical radiation for detectors measure and the suspension interaction for being connected to groups of optical fiber, wherein every Optical fiber has given diameter, and the end of optical fiber is with the identical end for being close to the first optical fiber to set a distance of the first optical fiber of distance Portion's positioning.
8. the method according to any one of preceding claims 1 to 7, further includes:
Using the one or more light sources for the outside for being placed on measuring chamber behind the window being located in measuring chamber wall by optics Radiation guidance is at suspension；And
It is mutual using the detectors measure and suspension for the outside for being placed on measuring chamber behind the window being located in measuring chamber The intensity of the optical radiation of effect, wherein detector has given diameter and is located at given away from one or more of light sources At distance.
9. the method according to any one of preceding claims 1 to 8, further includes:
It is measured and suspension phase interaction at the various concentration in concentration range using the first optical wavelength and the second optical wavelength The intensity of optical radiation；
Obtaining HexALab and KappaLab, HexALab and KappaLab indicates the suspension under the same concentrations that laboratory determines The HexA value and Kappa number of liquid；
It determines the letter of the relationship of the rate maps of the first intensity value of measurement and the second intensity value to HexALab and KappaLab Number；And
Predetermined factor is determined according to the function.
10. it is a kind of for measure include wood-fibred suspension measuring device, the measuring device includes for by optics spoke It penetrates and guides one or more optical power sources at suspension and the optical radiation for measuring and suspension interacts At least one optical measurement sensors, the measuring device is arranged such that
Change the concentration of suspension in concentration range；
It will use the optical radiation of the first optical wavelength and the second optical wavelength guidance at suspension；
For at least one given concentration value measurement and determine the optics spoke relevant to the first optical wavelength in concentration range The first intensity value and the second intensity value relevant to the second optical wavelength penetrated；
Determine the ratio of the first intensity value and the second intensity value；
Determine the Kappa number of suspension；
By the way that predetermined factor to be applied to the ratio of the first intensity value and the second intensity value, the original of hexenuronic acid HexA is obtained Value；And
By the way that the ratio determined is multiplied with Kappa number, the content of the hexenuronic acid HexA in suspension is determined.
11. equipment according to claim 10, in which:
At least one measurement sensor has given surface area, numerical aperture and away from one or more of optical power source Distance, given surface area and distance are selected according to concentration range and required intensive quantity.
12. the equipment according to any one of preceding claims 10 to 11, wherein one or more of optical power sources The first optical wavelength and the second optical wavelength being configured as within the scope of output ultraviolet radiation wave-lengths.
13. the equipment according to any one of preceding claims 10 to 12, wherein one or more of optical power sources It is configured as the first optical wavelength of value of the output with 235nm ± 20nm and the second optics of the value with 280nm ± 20nm Wavelength.
14. the equipment according to any one of preceding claims 10 to 13, the equipment is also configured to
The concentration for changing suspension, so that concentration is continually by all concentration in concentration range；
The intensity with the optical radiation of suspension interaction is measured at various concentration in concentration range；
Determine the maximum intensity of optical radiation relevant to the first optical wavelength and the second optical wavelength；And
Determining and the relevant optical radiation of the first optical wavelength maximum intensity to and the relevant optical radiation of the second optical wavelength Maximum intensity ratio.
15. the equipment according to any one of preceding claims 10 to 14, further includes:
First optical fiber is configured as guiding optical radiation at suspension, and the first end of optical fiber is connected to optical power source, light Fine second end is in measuring chamber；And
One or more detectors, for measuring the intensity with the optical radiation of suspension interaction, each detector connection To groups of optical fiber, every optical fiber has given diameter, and the end of optical fiber is in the identical given of the first optical fiber of distance Distance at positioned by the second end of the first optical fiber, given diameter and distance according to concentration range and required intensive quantity come Selection.
16. the equipment according to any one of preceding claims 10 to 14, further includes:
Window in measurement locular wall, optical power source are placed on outside measuring chamber behind the window in measurement locular wall, use It is guided at suspension in by optical radiation；And
One or more detectors, for measuring the intensity with the optical radiation of suspension interaction, detector is in measuring chamber It is placed on outside measuring chamber behind window in wall, each detector has given diameter and is located at given away from optical power source At distance, the given diameter and described selected to set a distance according to concentration range and required intensive quantity.
17. the equipment according to any one of preceding claims 10 to 16, the equipment is also configured to
It is measured and suspension phase interaction at the various concentration in concentration range using the first optical wavelength and the second optical wavelength The intensity of optical radiation；
Obtaining HexALab and KappaLab, HexALab and KappaLab indicates the suspension under the same concentrations that laboratory determines The HexA value and Kappa number of liquid；
It determines the letter of the relationship of the rate maps of the first intensity value of measurement and the second intensity value to HexALab and KappaLab Number；And
Predetermined factor is determined according to the function.
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