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WO1996011391A1 - Process for finding the moisture content of pressed pulp - Google Patents

Process for finding the moisture content of pressed pulp Download PDF

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Publication number
WO1996011391A1
WO1996011391A1 PCT/DE1995/001302 DE9501302W WO9611391A1 WO 1996011391 A1 WO1996011391 A1 WO 1996011391A1 DE 9501302 W DE9501302 W DE 9501302W WO 9611391 A1 WO9611391 A1 WO 9611391A1
Authority
WO
WIPO (PCT)
Prior art keywords
moisture content
chips
drum
weight
pulp
Prior art date
Application number
PCT/DE1995/001302
Other languages
German (de)
French (fr)
Inventor
Bernd Langhans
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO1996011391A1 publication Critical patent/WO1996011391A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
    • F26B25/225—Controlling the drying process in dependence on liquid content of solid materials or objects by repeated or continuous weighing of the material or a sample thereof
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
    • G01N9/36—Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture

Definitions

  • the invention relates to a method for determining the moisture content of pressed chips, in particular in the automatic process control of a plant for sugar production.
  • sugar beet supplied In sugar production, the processing of the sugar beet supplied is of major importance.
  • the sugar beets are first crushed into chips, from which the so-called raw juice is extracted.
  • the remaining chips are further processed in large-volume chip drying plants.
  • the object of the invention is therefore to propose a method with which the moisture content of pressed chips can be detected objectively.
  • the object is achieved in that the moisture content of the chips is determined by means of a weight measurement.
  • the weight measurement is advantageously carried out directly at the feed screw of the drum for drying the schnitzel. To do this, the entire feed screw is weighed in particular. The latter can take place continuously or discontinuously in the production process.
  • the invention is based on the experience that essentially water determines the weight of the chips.
  • the moisture content of the pressed chips can thus be inferred from the weight measurement. This is made possible by measuring the weight directly on the feed screw of the drum dryer.
  • a conventional drum of a chip drying system is identified by 10.
  • a drum 10 which has a length of approximately 20 m and a diameter of 5 hours, is assigned specific means 11 for rotation about its longitudinal axis, which are not discussed in more detail in this context.
  • Temperature sensors are present at various locations on the drum 10, for example the sensors 12 to 14.
  • the moisture of the dried schnitzel can be measured using a sensor
  • the chips are introduced as raw material into the drum 10 via a so-called screw-in or feed screw 5.
  • the feed screw 5 is usually part of the drum.
  • the feed screw 5 is decoupled from the drum 10 in such a way that it can be weighed on its own.
  • a first signal for the absolute amount of the chips entry and a second signal for the difference ⁇ of the chips entry can be obtained, the measuring points of which are denoted by 7 and 8 in the figure.
  • the weight signals obtained by weighing are evaluated together with the speed of the feed screw 5, which gives a direct measure of the water content and the amount of press chips supplied. In order to improve the control of the entire system, a statement about the current tendency of the moisture content may be sufficient.
  • a fuzzy system 20 with inputs 21 to 26 and an output 28.
  • the temperature measured values of the sensors 12 and 13, the quantity of the presses are used as further input signals for the fuzzy system 20 schnitzel, the difference in the amount of chips, the temperature at the exit of the drum 10 and the moisture of the chips after the drum 10 is detected.
  • a signal is delivered from the output 28 of the fuzzy unit 20, which is fed via a software PID function block 29 to a compound controller 30 for the burner output. From the compound controller 30 signals to a motor 35 for the Rotation of the drum 10 on the one hand and on an actuator 40 for the burner, not shown, on the other hand. This means that the entire wood-chip drying system can be operated automatically.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

The moisture content of the pulp introduced must be taken into account, especially for automatic process control in a pulp drying plant. According to the invention, the moisture content of the pulp is determined by weighing. The weight is determined directly at the feed worm of the drum, it being possible to weigh the disconnected complete feed worm. The moisture signal derived from the weight can be entered together with other signals into the inputs (21-26) of a fuzzy unit (20), the output (28) of which provides a signal for a compound controller (30).

Description

Beschreibungdescription
Verfahren zur Bestimmung des Feuchtegehaltes von PreßschnitzelnMethod for determining the moisture content of pressed chips
Die Erfindung bezieht sich auf ein Verfahren zur Bestimmung des Feuchtegehaltes von Preßschnitzeln, insbesondere bei der automatischen Prozeßführung einer Anlage zur Zuckerherstel¬ lung.The invention relates to a method for determining the moisture content of pressed chips, in particular in the automatic process control of a plant for sugar production.
Bei der Zuckerherstellung kommt der Aufarbeitung der angelie¬ ferten Zuckerrüben eine wesentliche Bedeutung zu. Die Zucker¬ rüben werden zunächst zu Schnitzeln zerkleinert, woraus der sogenannte Rohsaft extrahiert wird. Die verbleibenden Schnit- zel werden in großvolumigen Schnitzeltrocknungsanlagen wei¬ terverarbeitet.In sugar production, the processing of the sugar beet supplied is of major importance. The sugar beets are first crushed into chips, from which the so-called raw juice is extracted. The remaining chips are further processed in large-volume chip drying plants.
Bekannte Anlagen zur Schnitzeltrocknung werden zum großen Teil per Hand durch erfahrene Bedienpersonen gesteuert, wo- durch insbesondere externe Produktionseinflüsse berücksich¬ tigt werden. Eine automatische Betriebsführung an Schnitzel¬ trocknungsanlagen in der Zuckerindustrie, die mit herkömm¬ lichen Trommeltrocknern arbeiten, ist dagegen durch die stark schwankenden Eingangsgrößen nicht über einen längeren Zeit- räum hinweg möglich. Insbesondere ist es nicht möglich, den Feuchtegehalt der zugeführten Prozeßschnitzel ausreichend sicher zu bestimmen. Letzterer ist aber eine wesentliche Einflußgröße bei der Prozeßführung.Known systems for chip drying are largely controlled by hand by experienced operators, which in particular takes external production influences into account. Automatic operation management of schnitzel drying plants in the sugar industry, which work with conventional drum dryers, on the other hand, is not possible over a longer period of time due to the strongly fluctuating input variables. In particular, it is not possible to determine the moisture content of the process chips supplied with sufficient certainty. The latter, however, is an important factor influencing process control.
Aufgabe der Erfindung ist es daher, ein Verfahren vorzuschla¬ gen, mit dem der Feuchtegehalt von Preßschnitzeln objektiv erfaßt werden kann.The object of the invention is therefore to propose a method with which the moisture content of pressed chips can be detected objectively.
Die Aufgabe ist erfindungsgemäß dadurch gelöst, daß der Feuchtegehalt der Schnitzel über eine Gewichtsmessung be¬ stimmt wird. Vorteilhafterweise erfolgt die Gewichtsmessung direkt an der Eintragsschnecke der Trommel zur Schnitzel¬ trocknung. Dafür wird insbesondere die komplette Eintrags- Schnecke gewogen. Letzteres kann im Produktionsprozeß konti¬ nuierlich oder diskontinuierlich erfolgen.The object is achieved in that the moisture content of the chips is determined by means of a weight measurement. The weight measurement is advantageously carried out directly at the feed screw of the drum for drying the schnitzel. To do this, the entire feed screw is weighed in particular. The latter can take place continuously or discontinuously in the production process.
Im Rahmen der Erfindung können Aussagen über die Tendenz des Feuchtegehaltes der Preßschnitzel für eine automatische Steuerung ausreichen. Vorteilhafterweise können derart gewon¬ nene Signale im Rahmen einer Fuzzy-Regelung verwendet werden,In the context of the invention, statements about the tendency of the moisture content of the pressed chips can be sufficient for automatic control. Signals obtained in this way can advantageously be used in the context of a fuzzy control,
Die Erfindung geht von der Erfahrung aus, daß im wesentlichen Wasser das Gewicht der Schnitzel bestimmt. Somit kann über Gewichtsmessung auf den Feuchtegehalt der Preßschnitzel ge¬ schlossen werden. Dies wird durch die Gewichtsmessung direkt an der Eintragsschnecke des Trommeltrockners möglich.The invention is based on the experience that essentially water determines the weight of the chips. The moisture content of the pressed chips can thus be inferred from the weight measurement. This is made possible by measuring the weight directly on the feed screw of the drum dryer.
Weitere Einzelheiten und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung eines Ausführungsbeispiels anhand der Zeichnung. Die einzige Figur zeigt in schemati- scher Form die mögliche Automatisierung der Schnitzel¬ trocknung im Rahmen einer Schnitzeltrocknungsanlage für die Zuckerindustrie.Further details and advantages of the invention will become apparent from the following description of an embodiment with reference to the drawing. The single figure shows in schematic form the possible automation of the schnitzel drying in the context of a schnitzel drying installation for the sugar industry.
In der Figur ist eine herkömmliche Trommel einer Schnitzel- trocknungsanlage mit 10 gekennzeichnet. Einer solchen Trommel 10, die etwa eine Länge von 20 m und einen Durchmesser von 5 h hat, sind zur Rotation um deren Längsachse spezifische Mittel 11 zugeordnet, auf die in diesem Zusammenhang nicht näher eingegangen wird. Weiterhin ist ein Brenner vorhanden, mit dem die Trommel 10 auf vorbestimmbare Temperaturen ge¬ heizt wird. An verschiedenen Stellen der Trommel 10 sind Tem¬ peratursensoren vorhanden, beispielsweise die Sensoren 12 bis 14. Am Ende der Trommel 10 ist ein sogenanntes AusfallgehäuseIn the figure, a conventional drum of a chip drying system is identified by 10. Such a drum 10, which has a length of approximately 20 m and a diameter of 5 hours, is assigned specific means 11 for rotation about its longitudinal axis, which are not discussed in more detail in this context. There is also a burner with which the drum 10 is heated to predeterminable temperatures. Temperature sensors are present at various locations on the drum 10, for example the sensors 12 to 14. At the end of the drum 10 there is a so-called failure housing
15 zum Austrag der getrockneten Schnitzel angeordnet. Die Feuchte der getrockneten Schnitzel kann mittels eines Sensors15 arranged to discharge the dried schnitzel. The moisture of the dried schnitzel can be measured using a sensor
16 außerhalb der Trommel 10 erfaßt werden. In die Trommel 10 werden die Schnitzel als Rohmaterial über eine sogenannte Einfall- oder Eintragsschnecke 5 eingebracht. Üblicherweise ist die Eintragsschnecke 5 Teil der Trommel.16 outside the drum 10 are detected. The chips are introduced as raw material into the drum 10 via a so-called screw-in or feed screw 5. The feed screw 5 is usually part of the drum.
In der Figur ist die Eintragsschnecke 5 derart von der Trom¬ mel 10 entkoppelt, daß sie für sich gewogen werden kann. Da¬ mit ist am Punkt 6 eine Gewichtsmessung der in die Eintrags- Schnecke 5 eingebrachten Schnitzel, d.h. direkt mit Einfall der Schnitzel, möglich. Weiterhin lassen sich ein erstes Signal für die absolute Menge des Schnitzeleintrages und ein zweites Signal für den Differenzbetrag Δ des Schnitzeleintra¬ ges gewinnen, deren Meßpunkte in der Figur mit 7 und 8 be¬ zeichnet sind.In the figure, the feed screw 5 is decoupled from the drum 10 in such a way that it can be weighed on its own. This means at point 6 a weight measurement of the chips introduced into the feed screw 5, i.e. directly with the chips coming in, possible. Furthermore, a first signal for the absolute amount of the chips entry and a second signal for the difference Δ of the chips entry can be obtained, the measuring points of which are denoted by 7 and 8 in the figure.
Die durch Wägung erhaltenen Gewichtssignale werden zusammen mit der Drehzahl der Eintragsschnecke 5 ausgewertet, womit ein unmittelbares Maß für den Wassergehalt und die Menge der zugeführten Preßschnitzel erhalten wird. Um die Steuerung der gesamten Anlage zu verbessern, ist gegebenenfalls bereits eine Aussage über die aktuelle Tendenz des Feuchtegehaltes ausreichend.The weight signals obtained by weighing are evaluated together with the speed of the feed screw 5, which gives a direct measure of the water content and the amount of press chips supplied. In order to improve the control of the entire system, a statement about the current tendency of the moisture content may be sufficient.
In der Figur ist weiterhin ein Fuzzy-System 20 mit Eingängen 21 bis 26 und einem Ausgang 28 vorhanden. Neben dem Gewichts- signal, das durch die Verwiegung der Eintragsschnecke 5 ge¬ wonnen wurde und in den ersten Eingang gegeben wird, werden als weitere Eingangssignale für das Fuzzy-System 20 die Tem¬ peraturmeßwerte der Sensoren 12 und 13, die Menge der Pre߬ schnitzel, der Differenzbetrag des Schnitzeleintrages, die Temperatur am Ausgang der Trommel 10 und die Feuchte der Schnitzel nach der Trommel 10 erfaßt. Nach Fuzzifizierung unter Anwendung entsprechender Regeln und Defuzzifizierung wird vom Ausgang 28 der Fuzzy-Einheit 20 ein Signal gelie¬ fert, das über einen Software PID-Funktionsbaustein 29 einem Verbundregler 30 für die Brennerleistung zugeführt wird. Vom Verbundregler 30 werden Signale auf einen Motor 35 für die Rotation der Trommel 10 einerseits und auf eine Stelleinheit 40 für den nicht dargestellten Brenner andererseits gegeben. Es ist somit eine automatische Betriebsführung der gesamten Schnitzeltrocknungsanlage möglich. In the figure there is also a fuzzy system 20 with inputs 21 to 26 and an output 28. In addition to the weight signal, which was obtained by weighing the feed screw 5 and is put into the first input, the temperature measured values of the sensors 12 and 13, the quantity of the presses, are used as further input signals for the fuzzy system 20 schnitzel, the difference in the amount of chips, the temperature at the exit of the drum 10 and the moisture of the chips after the drum 10 is detected. After fuzzification using appropriate rules and defuzzification, a signal is delivered from the output 28 of the fuzzy unit 20, which is fed via a software PID function block 29 to a compound controller 30 for the burner output. From the compound controller 30 signals to a motor 35 for the Rotation of the drum 10 on the one hand and on an actuator 40 for the burner, not shown, on the other hand. This means that the entire wood-chip drying system can be operated automatically.

Claims

Patentansprüche claims
1. Verfahren zur Bestimmung des Feuchtegehaltes von Pre߬ schnitzeln, insbesondere bei der automatischen Prozeßführung einer Anlage zur Zuckerherstellung, d a d u r c h g e ¬ k e n n z e i c h n e t , daß der Feuchtegehalt durch eine Gewichtsmessung bestimmt wird.1. A method for determining the moisture content of pressed chips, particularly in the automatic process control of a plant for sugar production, so that the moisture content is determined by a weight measurement.
2. Verfahren nach Anspruch 1, wobei eine Trommel zur Schnit- zeltrocknung mit einer Eintragschnecke für die Schnitzel verwendet wird, d a d u r c h g e k e n n z e i c h ¬ n e t , daß die Gewichtsmessung direkt an der Eintrags¬ schnecke erfolgt.2. The method according to claim 1, wherein a drum is used for drying the cuttings with an entry screw for the chips, so that the weight is measured directly on the entry screw.
3. Verfahren nach Anspruch 2, d a d u r c h g e k e n n ¬ z e i c h n e t , daß die komplette Eintragsschnecke ge¬ wogen wird.3. The method of claim 2, d a d u r c h g e k e n n ¬ z e i c h n e t that the complete feed screw is weighed.
4. Verfahren nach einem der vorhergehenden Ansprüche, d a - d u r c h g e k e n n z e i c h n e t , daß der aus der4. The method according to any one of the preceding claims, d a - d u r c h g e k e n n z e i c h n e t that the from
Gewichtsmessung bestimmte Feuchtegehalt zusammen mit weiteren Signalen auf die Eingänge einer Fuzzy-Einheit gegeben wird.Weight measurement certain moisture content together with other signals is given to the inputs of a fuzzy unit.
5. Verfahren nach Anspruch 4, d a d u r c h g e k e n n - z e i c h n e t , daß das Ausgangssignal der Fuzzy-Einheit als Regelsignal für die Schnitzeltrocknung unter Berück¬ sichtigung des sich ändernden Feuchtegehaltes verwendet wird. 5. The method of claim 4, d a d u r c h g e k e n n - z e i c h n e t that the output signal of the fuzzy unit is used as a control signal for the chip drying taking into account the changing moisture content.
PCT/DE1995/001302 1994-10-07 1995-09-21 Process for finding the moisture content of pressed pulp WO1996011391A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4435808.3 1994-10-07
DE19944435808 DE4435808A1 (en) 1994-10-07 1994-10-07 Method for determining the moisture content of pressed chips

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WO1996011391A1 true WO1996011391A1 (en) 1996-04-18

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DE (1) DE4435808A1 (en)
TR (1) TR199501222A2 (en)
WO (1) WO1996011391A1 (en)

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CN107014156A (en) * 2017-04-26 2017-08-04 常州广建仪器科技有限公司 Dried object moisture measurement method, Minton dryer and its control method

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DE19919206A1 (en) * 1999-04-28 2000-11-02 Buehler Ag Process for the production of pasta

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DE1604806A1 (en) * 1963-12-27 1971-01-21 Buettner Schilde Haas Ag Process for the production of evenly dried animal feed, in particular diffusion chips
FR2053730A5 (en) * 1969-07-16 1971-04-16 Besson Guyard Maurice Continuous determination of sugar in vege-table products
US4179265A (en) * 1977-10-17 1979-12-18 Holly Sugar Corporation Method and apparatus for operating rotary driers
FR2699280A1 (en) * 1992-12-11 1994-06-17 Mg Entreprise Continuous measurement of humidity of bulk prod. during drying e.g. nuts - by measuring wt. of sample column and determining humidity w.r.t. dry wt.

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DE1604806A1 (en) * 1963-12-27 1971-01-21 Buettner Schilde Haas Ag Process for the production of evenly dried animal feed, in particular diffusion chips
FR2053730A5 (en) * 1969-07-16 1971-04-16 Besson Guyard Maurice Continuous determination of sugar in vege-table products
US4179265A (en) * 1977-10-17 1979-12-18 Holly Sugar Corporation Method and apparatus for operating rotary driers
FR2699280A1 (en) * 1992-12-11 1994-06-17 Mg Entreprise Continuous measurement of humidity of bulk prod. during drying e.g. nuts - by measuring wt. of sample column and determining humidity w.r.t. dry wt.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107014156A (en) * 2017-04-26 2017-08-04 常州广建仪器科技有限公司 Dried object moisture measurement method, Minton dryer and its control method

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TR199501222A2 (en) 1996-07-21
DE4435808A1 (en) 1996-04-11

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