DE102010047046A1 - Method for controlling chemical- or auxiliary fuel supply at solid-liquid separation of suspensions by using optical system, involves using measuring values from optical determination for regulating metering of chemicals - Google Patents

Method for controlling chemical- or auxiliary fuel supply at solid-liquid separation of suspensions by using optical system, involves using measuring values from optical determination for regulating metering of chemicals Download PDF

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DE102010047046A1
DE102010047046A1 DE201010047046 DE102010047046A DE102010047046A1 DE 102010047046 A1 DE102010047046 A1 DE 102010047046A1 DE 201010047046 DE201010047046 DE 201010047046 DE 102010047046 A DE102010047046 A DE 102010047046A DE 102010047046 A1 DE102010047046 A1 DE 102010047046A1
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chemicals
suspensions
solid
liquid separation
optical
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wird später genannt werden Erfinder
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    • 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
    • G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
    • G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
    • 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
    • G01N2021/8416—Application to online plant, process monitoring and process controlling, not otherwise provided for
    • 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
    • G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
    • G01N21/45—Refractivity; Phase-affecting properties, e.g. optical path length using interferometric methods; using Schlieren methods
    • G01N21/455—Schlieren methods, e.g. for gradient index determination; Shadowgraph

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  • Chemical & Material Sciences (AREA)
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Abstract

The method involves using the measuring values from the optical determination for regulating the metering of the chemicals, additives or the suspension that is applied in a separator. The performance of a supply pump or the dosing pumps is regulated with the help of closed loop over frequency changer or the drives of the pumps or conveyors.

Description

Hintergrundbackground

Bei der verfahrenstechnischen Behandlung von Suspensionen zur Fest-/Flüssigtrennung werden Chemikalien bzw. Hilfsmittel (z. B synthetische, organische Polymere, im Weiteren „Hilfsstoffe” genannt) zur besseren Agglomeration des Feststoffanteils in der Flüssigen Phase eingesetzt. Die verbesserte Agglomeration dient der Erleichterung der Separation von Feststoffpartikeln von der Flüssigen Phase wenn insbesondere die Dichten dieser Phasen eng beieinander liegen, wie es häufig bei Ölschlammen, Klärschlämmen, Hydroxidschlämmen und anderen organischen oder anorganischen, „schwer entwässerbaren” Suspensionen vorliegt.In the process engineering treatment of suspensions for solid / liquid separation, chemicals or auxiliaries (for example synthetic, organic polymers, hereinafter referred to as "auxiliaries") are used for better agglomeration of the solids content in the liquid phase. The improved agglomeration serves to facilitate the separation of solid particles from the liquid phase when, in particular, the densities of these phases are close together, as is often the case with oil sludges, sewage sludges, hydroxide slurries and other organic or inorganic, "difficult to dewater" suspensions.

Allerdings kann bei den bekannten Separationsprozessen (Eindickung, Entwässerung, Filtration, Zentrifugieren, Pressen) der Feststoffanteil in der Suspension je nach seiner Natur schwanken. Damit einhergehend entsteht das Problem der genauen Dosierung der Chemikalien- und Hilfsstoffe, da bei Schwankungen der Feststoffanteile die Zugabe dieser Hilfsstoffe entsprechend angepasst werden soll, um eine Über- oder Unterdosierung zu vermeiden.However, in the known separation processes (thickening, dehydration, filtration, centrifuging, pressing) the solids content in the suspension may vary according to its nature. Along with this, there is the problem of precise metering of the chemicals and auxiliaries since, in the case of fluctuations in the solids content, the addition of these auxiliaries should be adjusted accordingly in order to avoid overdosing or underdosing.

Eine Unterdosierung wird in der Regel vermieden indem der Eindickungs- bzw. Entwässerungsbetrieb mit einer beabsichtigten, leichten Überdosierung der Hilfsstoffe gefahren wird, so dass eine befriedigende Abscheidung der Feststoffe von der flüssigen Phase gelingt. Die Einstellungen dazu werden in der Regel empirisch in Feldversuchen ermittelt und als Betriebsanweisung etabliert.An underdosing is avoided as a rule by the thickening or dewatering operation is driven with an intended, slight overdose of the excipients, so that a satisfactory separation of the solids from the liquid phase succeeds. The settings for this are usually determined empirically in field trials and established as operating instructions.

Eine unbeabsichtigte, signifikante Überdosierung der Hilfsstoffe ist insbesondere im Hinblick auf die ökologische und ökonomische Situation beim Betrieb der Fest-/Flüssigtrennung zu vermeiden. Die unnötige Überdosierung führt zum Freisetzen der Chemikalien über das Filtrat/Zentrat und trägt somit zu einer Belastung der Umwelt und zu einer Erhöhung der Betriebskosten bei.An unintentional, significant overdosage of the auxiliaries is to be avoided, in particular with regard to the ecological and economical situation during the operation of the solid / liquid separation. The unnecessary overdosage leads to the release of the chemicals via the filtrate / centrate and thus contributes to a burden on the environment and to an increase in operating costs.

Die vorliegende Erfindung soll die Regelung der Chemikaliendosierung quasikontinuierlich, zuverlässig und zu einem vertretbaren zusätzlichen Aufwand bewerkstelligen. Sie besteht aus dem neuen „STREAK CONTROL”-Verfahren (SCP) und der erforderlichen Mess- und Regelstrecke.The present invention is intended to accomplish the control of the chemical dosage quasi-continuous, reliable and at a justifiable additional expense. It consists of the new "STREAK CONTROL" method (SCP) and the required measuring and controlled system.

Beim neuen SCP-Verfahren wird das Filtrat/Zentrat, das die beim Eindickungs- bzw. Entwässerungsbetrieb abgeschiedene Flüssige Phase darstellt, mittels eines optischen Systems, basierend auf der Schlierenfotografie, auf Reste der eingesetzten Hilfsstoffe hin quantitativ als Summenparameter untersucht. Die durch die schlierenfotografischen, optischen Messeinrichtung erhaltenen Messwerte werden von einer kontinuierlich arbeitenden Regelstrecke für die Stellwerte des Dosierungssystems der Hilfsstoffe und oder der Regelung der Zufuhr der Suspension in den Separator benutzt (siehe Abbildung A1) Blockschema und A2) Mess- und Regelschema des SCP Verfahrens). Dadurch kann eine quasikontinuierliche, optimierte Dosierung der Hilfsstoffe in die Suspension in Abhängigkeit von der verbliebenen Restmenge der Chemikalien/Hilfsstoffe im Filtrat/Zentrat bewerkstelligt werden.In the new SCP process, the filtrate / centrate, which represents the liquid phase separated during the thickening or dewatering operation, is examined quantitatively as a sum parameter by means of an optical system based on Schlieren photography for residues of the auxiliary substances used. The measured values obtained by the Schlieren photographic optical measuring device are used by a continuously operating controlled system for the control values of the dosing system of the auxiliaries and / or the control of the feed of the suspension into the separator (see Figure A1) Block Scheme and A2) Measurement and Control Scheme of the SCP Method ). This allows a quasi-continuous, optimized metering of the excipients in the suspension depending on the remaining amount of chemicals / excipients in the filtrate / centrate be accomplished.

Beschreibung des PIDs (Zeichnung 2):Description of the PID (drawing 2):

Die aus der Messung QIC 100 (optische Messung auf Basis der schlierenfotografischen Effekte) erhaltenen Daten über den Restgehalt an Chemikalien/Hilfsstoffe im Filtrat/Zentrat werden über eine Regelstrecke zur Einstellung der Dosierleistung der Chemikalien/Hilfsstoffpumpe P200 oder der Zufuhrpumpe für die Suspension P100 genutzt. Je nach Abweichung vom Sollwert werden die Förderleistungen der P100 und P200 getrennt oder gemeinsam selbstregelnd (Automatikbetrieb) über deren Antriebe bzw. deren Frequenzumrichter hoch- oder heruntergefahren.The data on the residual content of chemicals / excipients in the filtrate / centrate obtained from the QIC 100 measurement (optical measurement based on schlieren photographic effects) are used via a controlled system to adjust the dosing capacity of the chemicals / excitation pump P200 or the feed pump for the suspension P100. Depending on the deviation from the setpoint, the delivery rates of the P100 and P200 can be increased or decreased separately or jointly via self-regulation (automatic mode) via their drives or their frequency inverters.

Claims (4)

Anwendung einer optischen Einrichtung auf Basis der schlierenfotografischen Effekte bei der Messung von Chemikalien/Hilfsstoffen im Filtrat/Zentrat oder sonstiger Fluidströme die bei dem Betrieb der Separation von Suspensionen (Fest/Flüssigtrennung) auftreten.Application of an optical device based on the Schlieren photographic effects in the measurement of chemicals / excipients in the filtrate / centrate or other fluid streams that occur in the operation of the separation of suspensions (solid / liquid separation). Verwendung der Messwerte aus der optischen Bestimmung aus 1) zur Regelung der Dosierung der Chemikalien/Hilfsstoffe oder der in den Separator gelangenden Suspension.Use of the measured values from the optical determination of 1) for controlling the metering of the chemicals / auxiliaries or of the suspension entering the separator. Regelung der Leistungen der Zufuhrpumpen der Suspension und/oder der Chemikalien/Hilfsstoffe-Dosierpumpen mit Hilfe des aus 1) und 2) aufgebauten Regelkreises über Frequenzumformer und/oder Antriebe der genannten Pumpen oder Fördereinrichtungen.Regulation of the performance of the feed pumps of the suspension and / or the chemicals / auxiliaries metering pumps with the aid of the control circuit constructed from 1) and 2) via frequency converters and / or drives of said pumps or conveyors. Das gesamte unter 1), 2) und 3) beschriebene und genannte Verfahren wird als „Streak Control Process” bzw. „Streak Control-Verfahren” in die entsprechenden Fachgebiete eingeführt.The entire process described and referred to under 1), 2) and 3) is introduced as "Streak Control Process" or "Streak Control Process" in the corresponding fields.
DE201010047046 2010-09-30 2010-09-30 Method for controlling chemical- or auxiliary fuel supply at solid-liquid separation of suspensions by using optical system, involves using measuring values from optical determination for regulating metering of chemicals Withdrawn DE102010047046A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020128804A1 (en) 2020-11-02 2022-05-05 ARU Anlagen für Recycling und Umweltschutz Dr.-Ing. Johannes Biegel GbR (vertretungsberechtigter Gesellschafter: Dr. Johannes Biegel, 66763 Dillingen) Device and method for the continuous separation of free-flowing substances of different densities in a suspension
DE102022110244A1 (en) 2022-04-27 2023-11-02 Johannes Biegel Device and method for thickening a suspension which has flowable substances of different densities

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020128804A1 (en) 2020-11-02 2022-05-05 ARU Anlagen für Recycling und Umweltschutz Dr.-Ing. Johannes Biegel GbR (vertretungsberechtigter Gesellschafter: Dr. Johannes Biegel, 66763 Dillingen) Device and method for the continuous separation of free-flowing substances of different densities in a suspension
WO2022090330A1 (en) 2020-11-02 2022-05-05 Aru Anlagen Für Recycling Und Umweltschutz Dr.-Ing. Johannes Biegel Gbr Device and method for continuously separating flowable materials of different density in a suspension
DE102020128804B4 (en) 2020-11-02 2022-12-29 Alfa Laval Corporate Ab Device and method for the continuous separation of free-flowing substances of different densities in a suspension
DE102022110244A1 (en) 2022-04-27 2023-11-02 Johannes Biegel Device and method for thickening a suspension which has flowable substances of different densities
WO2023208435A1 (en) 2022-04-27 2023-11-02 Johannes Biegel Device and method for thickening a suspension containing fluid substances of different densities

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