EP0210294B1 - Method and device for the preparation of suspensions with constant indications from basic materials with variable properties - Google Patents

Method and device for the preparation of suspensions with constant indications from basic materials with variable properties Download PDF

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Publication number
EP0210294B1
EP0210294B1 EP85109553A EP85109553A EP0210294B1 EP 0210294 B1 EP0210294 B1 EP 0210294B1 EP 85109553 A EP85109553 A EP 85109553A EP 85109553 A EP85109553 A EP 85109553A EP 0210294 B1 EP0210294 B1 EP 0210294B1
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EP
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Prior art keywords
suspension
constant
ball mill
mixing
particle size
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EP85109553A
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German (de)
French (fr)
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EP0210294A1 (en
Inventor
Reinhard Dr. Klose
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SALZGITTER ANLAGENBAU ZWEIGNIEDERLASSUNG DER PREUS
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Salzgitter Anlagenbau Zweigniederlassung der Preussag Anlagenbau GmbH
Salzgitter Industriebau GmbH
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Application filed by Salzgitter Anlagenbau Zweigniederlassung der Preussag Anlagenbau GmbH, Salzgitter Industriebau GmbH filed Critical Salzgitter Anlagenbau Zweigniederlassung der Preussag Anlagenbau GmbH
Priority to EP85109553A priority Critical patent/EP0210294B1/en
Priority to DE8585109553T priority patent/DE3563310D1/en
Priority to US06/840,445 priority patent/US4706892A/en
Priority to CA000504668A priority patent/CA1294263C/en
Priority to ZA865440A priority patent/ZA865440B/en
Priority to AU60475/86A priority patent/AU576092B2/en
Priority to JP61176833A priority patent/JPS6249942A/en
Publication of EP0210294A1 publication Critical patent/EP0210294A1/en
Publication of EP0210294B1 publication Critical patent/EP0210294B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/56—Mixing liquids with solids by introducing solids in liquids, e.g. dispersing or dissolving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/80—Forming a predetermined ratio of the substances to be mixed
    • B01F35/82—Forming a predetermined ratio of the substances to be mixed by adding a material to be mixed to a mixture in response to a detected feature, e.g. density, radioactivity, consumed power or colour
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/22—Control or regulation
    • B01F35/2201—Control or regulation characterised by the type of control technique used
    • B01F35/2209—Controlling the mixing process as a whole, i.e. involving a complete monitoring and controlling of the mixing process during the whole mixing cycle

Definitions

  • the invention relates to a method for producing particularly highly concentrated, fine-grained suspensions with constant characteristics from raw materials with variable properties.
  • a suspension contains, for example, fine-grained coal or fine-grained mineral and a liquid carrier. It can be used to transport the fine-grained substances in pipes or to store them in containers and to feed the solids to an application.
  • the solids to be introduced into the suspension have changing moisture contents and other properties.
  • the respective hardness of the raw material can have an influence on which grain sizes occur during the crushing to be provided.
  • the liquid carrier also affects the characteristics of the suspension when z. B. changes its temperature or its salinity.
  • Such suspensions are usually admixed with additives which can also have an influence on the characteristics of the suspension.
  • the additives are selected according to the use of the suspensions and can be surfactants, defoamers, stabilizers, biocides, etc.
  • WO 84/03297 describes a method for producing a suspension in which material to be comminuted is processed in ball mills together with carrier liquid and a dispersant. To produce the grain size distribution required here, however, at least two mills are necessary, the suspension of which, with multiple checks of viscosity, density, grain sizes, etc., may be joined together with the addition of further carrier liquid or return of parts of the suspensions in mixers, so that the finished suspension to be dispensed is mixed Properties is even.
  • This method and the device specified for its implementation are very complex and, in particular, do not permit continuous delivery of the suspension with constant characteristics at a constant pressure into a delivery line.
  • the moisture content of the pre-comminuted solids supplied is preferably also determined and the amount of carrier to be added is adjusted accordingly.
  • a pre-shredding z. B. with coal in a roller mill to a grain size of max. 6 mm, preferably of max. 4 mm is appropriate.
  • the solid particles are max. 0.2 mm crushed, it being preferred that at least two thirds of the mass of the fine-grained solid parts produced have a grain size of at most 0.1 mm.
  • Such a suspension which can consist of 65-75% of its mass of solid particles, can also be pumped over a greater distance in a pipeline.
  • the total amount of additives in a suspension is usually up to about 0.6% of the mass, depending on the effects expected from the additives.
  • the viscosity of the suspension can be influenced by suitable selection of known additives and, if appropriate, increasing their proportion up to about 1%, without the expected effects of the additives being impaired.
  • the choice of the type, amount and mixture of additives therefore makes it possible to keep the viscosity of the suspension constant if it is affected by any influences such as e.g. B. begins by a change in the grain size of the solid particles or by a change in the liquid content of a predetermined value.
  • the crushing process can also be influenced. This allows the suspension with constant characteristics to be produced by two overlapping control mechanisms.
  • a ball mill is used as a mixing and crushing device. This contains balls, the diameter of which decrease with increasing degree of comminution. By changing the number of revolutions of the ball mill, the grain size of the emerging solid particles can be influenced at constant throughput. The ball mill will be bigger Other solid parts, carrier liquid and additives are fed via an inlet. The treatment of these raw materials in the ball mill leads to an intensive mixing and the formation of the solid-liquid suspension.
  • the toughness of the suspension is determined on the outlet side of the ball mill and the existing grain sizes are determined by taking and examining samples.
  • a correction can be made by changing the proportions of the imported raw materials including the composition of the additives and the speed of the ball mill.
  • the suspension can be checked automatically by means of suitable known devices, and automatic control of the suspension production is possible via a computer program.
  • Pre-broken coal arrives from a feed hopper 1 on a dosing belt scale 2 and falls from it into the inlet 3 of a ball mill 4.
  • the inlet 5 also opens into the inlet 3 for the water serving as carrier liquid.
  • Various additives or additive mixtures can be fed into the inlet 3 via lines 6, 7, 8.
  • the ball mill 4 is gatted, i. H. it consists of several departments with balls of different sizes, which are only indicated in the drawing.
  • the suspension of fine solid particles and water and additives produced in the ball mill flows through the outlet 9 to a pump sump 10 and is pressed from here into a delivery line 12 by means of a pump 11.
  • the viscosity of the suspension can be measured using a suitable measuring device 13, such as. B. the illustrated propeller 14 can be determined.
  • Grain sizes and composition of the solid particles are determined by means of an optical test device 15 in the case of samples taken from the outlet 9 at short intervals by means of a sampling probe 16.
  • the suspension in the partial flow is diluted with water until it is translucent and then flows through the measuring cell of a particle size analyzer.
  • the measuring cell for example, the light of a laser is scattered and reflected on the particles and registered by optical pickups, the measured values of which are compared in a computer 17 with target values. If a change in the particle sizes is necessary, the drive 18 of the ball mill 4 is influenced by the computer 17, so that it changes its speed at a constant throughput. A deviation in the suspension viscosity from a predetermined value is also corrected by the computer 17.
  • the type and amount of the additives is set via controllable valves 18, 19, 20 in the lines 6, 7, 8.
  • a change in the moisture content of the coal supplied is determined on the belt scale 2 by a moisture meter 23, for example by means of infrared rays. If the coal moisture content changes, the belt scale speed is corrected.
  • the supply of water is adjusted by adjusting the control valve 21 in the feed line 5.
  • the amount of water added is determined by a flow meter 22.
  • the suspension to be dispensed should have a constant coal content of 70% with a grain size up to max. 0.2 mm, but mostly less than 0.1 mm. These characteristics must remain constant so that the suspension z. B. can be burned in a burner.
  • the viscosity can therefore be corrected for the additives in accordance with a suitable computer program by controlling one or more of the valves 18, 19, 20 in such a way that the target value of the viscosity is maintained.
  • the system shown with the monitoring and control directions thus create the possibility of producing a highly concentrated suspension with characteristics that are constant at least with regard to the concentration of the core sizes and the toughness, even when the properties of the base materials change.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Crushing And Grinding (AREA)
  • Liquid Carbonaceous Fuels (AREA)
  • Disintegrating Or Milling (AREA)
  • Colloid Chemistry (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von besonders hochkonzentrierten, feinkörnigen Suspensionen mit konstanten Merkmalen aus Grundstoffen mit veränderlichen Eigenschaften. Eine solche Suspension enthält beispielsweise feinkörnige Kohle oder feinkörniges Mineral und einen flüssigen Trägerstoff. Sie kann dazu verwendet werden, die feinkörnigen Stoffe in Rohrleitungen zu transportieren oder in Behältern zu lagern und die Feststoffe einer Anwendung zuzuführen.The invention relates to a method for producing particularly highly concentrated, fine-grained suspensions with constant characteristics from raw materials with variable properties. Such a suspension contains, for example, fine-grained coal or fine-grained mineral and a liquid carrier. It can be used to transport the fine-grained substances in pipes or to store them in containers and to feed the solids to an application.

Die in die Suspension einzubringenden Feststoffe haben je nach ihrem Ursprung sich verändernde Feuchtigkeitsgehalte und sonstige Eigenschaften. So kann die jeweilige Härte des Rohmaterials einen Einfluß darauf haben, welche Korngrößen bei einer vorzusehenden Zerkleinerung auftreten. Auch der flüssige Trägerstoff beeinflußt die Merkmale der Suspension, wenn sich z. B. seine Temperatur oder sein Salzgehalt verändert. Üblicherweise werden derartigen Suspensionen Additive zugemischt, die ebenfalls einen Einfluß auf die Merkmale der Suspension haben können. Die Additive werden entsprechend der Verwendung der Suspensionen gewählt und können Tenside, Entschäumer, Stabilisatoren, Biocide usw. sein.Depending on their origin, the solids to be introduced into the suspension have changing moisture contents and other properties. The respective hardness of the raw material can have an influence on which grain sizes occur during the crushing to be provided. The liquid carrier also affects the characteristics of the suspension when z. B. changes its temperature or its salinity. Such suspensions are usually admixed with additives which can also have an influence on the characteristics of the suspension. The additives are selected according to the use of the suspensions and can be surfactants, defoamers, stabilizers, biocides, etc.

Für die Pumpfähigkeit, den Transport und insbesondere die spätere Verwendung der Suspensionen werden jedoch gewisse konstante Merkmale gefordert. Zu diesen Merkmalen gehören ein weitgehend gleichbleibender möglichst gro-13er Anteil des Feststoffes in der Suspension, die Einhaltung bestimmter Korngrößen und eine im wesentlichen konstante Suspensionszähigkeit.However, certain constant characteristics are required for the pumpability, the transport and in particular the later use of the suspensions. These features include a largely constant, as large as possible, proportion of the solid in the suspension, compliance with certain grain sizes and an essentially constant suspension toughness.

Aus DE-C-29 29 430 ist es bekannt, einer schlammartigen Suspension eine Probe zu entnehmen und sie hinsichtlich der Feststoffteilchen mittels optischer Einrichtungen zu analysieren, um die Menge der Trägerflüssigkeit und den Förderdruck einzustellen. Dieser Vorschlag gestattet zwar, die Konsistenz der Suspension konstant zu halten, läßt aber keine Möglichkeit zur Änderung von Korngrößen und zur Einhaltung eines bestimmten Feststoffanteils in der Suspension zu.From DE-C-29 29 430 it is known to take a sample from a sludge-like suspension and to analyze it with respect to the solid particles by means of optical devices in order to adjust the amount of the carrier liquid and the delivery pressure. Although this proposal allows the consistency of the suspension to be kept constant, it does not allow the possibility of changing grain sizes and of maintaining a certain proportion of solids in the suspension.

In WO 84/03297 ist ein Verfahren zur Herstellung einer Suspension beschrieben, bei dem zu zerkleinerndes Material zusammen mit Trägerflüssigkeit und einem Dispergiermittel in Kugelmühlen bearbeitet wird. Zur Erzeugung der hier gewünschten Korngrößenverteilung sind jedoch wenigstens zwei Mühlen notwendig, deren Suspension unter mehrfacher Überprüfung von Viskosität, Dichte, Korngrößen usw. gegebenenfalls mit Zugabe weiterer Trägerflüssigkeit oder Rückleitung von Teilen der Suspensionen in Mischern zusammengefügt werden, so daß die abzugebende fertige Suspension bezüglich ihrer Eigenschaften gleichmäßig ist. Dieses Verfahren und die zu seiner Durchführung angegebene Einrichtung sind sehr aufwendig und lassen insbesondere eine kontinuierliche Abgabe der Suspension mit konstanten Merkmalen bei gleichbleibendem Druck in eine Förderleitung nicht zu.WO 84/03297 describes a method for producing a suspension in which material to be comminuted is processed in ball mills together with carrier liquid and a dispersant. To produce the grain size distribution required here, however, at least two mills are necessary, the suspension of which, with multiple checks of viscosity, density, grain sizes, etc., may be joined together with the addition of further carrier liquid or return of parts of the suspensions in mixers, so that the finished suspension to be dispensed is mixed Properties is even. This method and the device specified for its implementation are very complex and, in particular, do not permit continuous delivery of the suspension with constant characteristics at a constant pressure into a delivery line.

Es ist daher die Aufgabe der vorliegenden Erfindung, ein Verfahren und eine einfache Vorrichtung zur Herstellung, Überwachung und Beeinflussung der herzustellenden Suspension zu schaffen, um eine Suspension mit konstanten Merkmalen, insbesondere in Bezug auf den Feststoffanteil und die Zähigkeit, auch bei sich ändernden Grundstoffen zu erzeugen, um sie mit konstantem Druck und konstanter Menge einer Förderleitung zuführen zu können.It is therefore the object of the present invention to provide a method and a simple device for producing, monitoring and influencing the suspension to be produced in order to obtain a suspension with constant characteristics, in particular with regard to the solids content and the toughness, even with changing raw materials generate in order to be able to feed them to a delivery line with constant pressure and constant quantity.

Zur Lösung dieser Aufgabe wird ein verfahren gemäß Anspruch 1 vorgesehen. Vorzugsweise wird auch der Feuchtigkeitsgehalt der zugeführten vorzerkleinerten Feststoffe ermittelt und die zuzugebende Menge des Trägermittels entsprechend eingestellt.To achieve this object, a method according to claim 1 is provided. The moisture content of the pre-comminuted solids supplied is preferably also determined and the amount of carrier to be added is adjusted accordingly.

Eine Vorzerkleinerung z. B. bei Kohle in einer Walzenmühle auf eine Körnung von max. 6 mm, vorzugsweise von max. 4 mm, ist zweckmäßig. Während des Misch- und Zerkleinerungsprozesses werden die Feststoffteile auf max. 0,2 mm zerkleinert, wobei bevorzugt wird, daß wenigstens zwei Drittel der Masse der erzeugten feinkörnigen Feststoffteile eine Korngröße von höchstens 0,1 mm besitzen.A pre-shredding z. B. with coal in a roller mill to a grain size of max. 6 mm, preferably of max. 4 mm is appropriate. During the mixing and crushing process, the solid particles are max. 0.2 mm crushed, it being preferred that at least two thirds of the mass of the fine-grained solid parts produced have a grain size of at most 0.1 mm.

Es wurde festgestellt, daß eine derartige Suspension, die zu 65 - 75 % ihrer Masse aus Feststoffteilchen bestehen kann, auch über größere Entfernung in einer Rohrleitung pumpbar ist. Die gesamte Menge der Additive in einer Suspension beträgt üblicherweise etwa bis zu 0,6 % der Masse je nach den von den Additiven erwarteten Wirkungen. Es wurde gefunden, daß durch geeignete Auswahl von bekannten Additiven und ggf. Erhöhung ihres Anteils auf bis zu etwa 1 % die Zähigkeit der Suspension beeinflußt werden kann, ohne daß die erwarteten Wirkungen der Additive beeinträchtigt werden. Die Wahl der Art, Menge und Mischung der Additive ermöglicht es daher, die Zähigkeit der Suspension konstant zu halten, wenn diese durch irgendwelche Einflüsse wie z. B. durch eine Änderung der Körnung der Feststoffteilchen oder durch eine Änderung des Flüssigkeitsgehalts von einem vorgegebenen Wert abzuweichen .beginnt, während die Suspension vorzugsweise kontinuierlich hergestellt und abgegeben wird. Neben der Änderung der Zusammensetzung der Grundstoffe kann auch der Zerkleinerungsprozeß beeinflußt werden. Damit kann durch zwei sich überlagernde Regelmechanismen die Suspension mit konstanten Merkmalen hergestellt werden. Als Misch- und Zerkleinerungseinrichtung wird eine Kugelmühle verwendet. Diese enthält Kugeln, deren Durchmesser mit dem zunehmenden Zerkleinerungsgrad abnehmen. Durch eine Änderung der Umdrehungszahl der Kugelmühle kann bei konstantem Durchsatz die Körnung der austretenden Feststoffteilchen beeinflußt werden. Der Kugelmühle werden gröbere Feststoffteile, Trägerflüssigkeit und Additive über einen Einlauf zugeführt. Die Behandlung dieser Grundstoffe in der Kugelmühle führt zu einer intensiven Mischung und zur Bildung der Feststoff-Flüssigkeits-Suspension. An der Austrittsseite der Kugelmühle werden die Zähigkeit der Suspension und durch die Entnahme und Untersuchung von Proben die vorhandenen Korngrößen ermittelt. Wenn die laufend festgestellten Werte von vorgegebenen Soll-Werten abweichen, kann eine Korrektur über eine Änderung der Anteile der eingeführten Grundstoffe einschl. der Zusammensetzung der Additive sowie der Drehzahl der Kugelmühle erfolgen. Die Prüfung der Suspension kann durch geeignete bekannte Geräte automatisch erfolgen, und über ein Rechnerprogramm ist eine selbsttätige Steuerung der Suspensionsherstellung möglich.It was found that such a suspension, which can consist of 65-75% of its mass of solid particles, can also be pumped over a greater distance in a pipeline. The total amount of additives in a suspension is usually up to about 0.6% of the mass, depending on the effects expected from the additives. It has been found that the viscosity of the suspension can be influenced by suitable selection of known additives and, if appropriate, increasing their proportion up to about 1%, without the expected effects of the additives being impaired. The choice of the type, amount and mixture of additives therefore makes it possible to keep the viscosity of the suspension constant if it is affected by any influences such as e.g. B. begins by a change in the grain size of the solid particles or by a change in the liquid content of a predetermined value. Begins, while the suspension is preferably continuously produced and released. In addition to changing the composition of the raw materials, the crushing process can also be influenced. This allows the suspension with constant characteristics to be produced by two overlapping control mechanisms. A ball mill is used as a mixing and crushing device. This contains balls, the diameter of which decrease with increasing degree of comminution. By changing the number of revolutions of the ball mill, the grain size of the emerging solid particles can be influenced at constant throughput. The ball mill will be bigger Other solid parts, carrier liquid and additives are fed via an inlet. The treatment of these raw materials in the ball mill leads to an intensive mixing and the formation of the solid-liquid suspension. The toughness of the suspension is determined on the outlet side of the ball mill and the existing grain sizes are determined by taking and examining samples. If the continuously determined values deviate from specified target values, a correction can be made by changing the proportions of the imported raw materials including the composition of the additives and the speed of the ball mill. The suspension can be checked automatically by means of suitable known devices, and automatic control of the suspension production is possible via a computer program.

Weitere Einzelheiten der Erfindung werden anhand der beigefügten Zeichnung für ein bevorzugtes Ausführungsbeispiel beschrieben, bei dem eine im wesentlichen aus Kohle und Wasser bestehende Suspension hergestellt wird, deren Zähigkeit und deren Anteil an Kohle mit z. B. 70 % konstant bleiben sollen.Further details of the invention will be described with reference to the accompanying drawing for a preferred embodiment in which a suspension consisting essentially of coal and water is produced, the toughness and the proportion of coal of which, for. B. 70% should remain constant.

Aus einem Zuführungstrichter 1 gelangt vorgebrochene Kohle auf eine Dosierbandwaage 2 und fällt von dieser in den Einlauf 3 einer Kugelmühle 4. In den Einlauf 3 mündet auch die Zuleitung 5 für das als Trägerflüssigkeit dienende Wasser. Über Leitungen 6, 7, 8 können verschiedene Additive bzw. Additivmischungen in den Einlauf 3 geleitet werden. Die Kugelmühle 4 ist gattiert, d. h. sie besteht aus mehreren Abteilungen mit verschieden großen Kugeln, die in der Zeichnung nur angedeutet sind. Die in der Kugelmühle hergestellte Suspension aus feinen Feststoffteilchen und Wasser sowie Additiven fließt über den Auslauf 9 einem Pumpensumpf 10 zu und wird von hier mittels einer Pumpe 11 in eine Förderleitung 12 gedrückt. Die Zähigkeit der Suspension kann mittels einer geeigneten Meßeinrichtung 13, wie z. B. dem dargestellten Propeller 14, ermittelt werden. Korngrößen und Zusammensetzung der Feststoffteilchen werden mittels einer optischen Prüfeinrichtung 15 bei in kurzen Intervallen über eine Probeentnahmesonde 16 aus dem Auslauf 9 entnommenen Proben festgestellt.Pre-broken coal arrives from a feed hopper 1 on a dosing belt scale 2 and falls from it into the inlet 3 of a ball mill 4. The inlet 5 also opens into the inlet 3 for the water serving as carrier liquid. Various additives or additive mixtures can be fed into the inlet 3 via lines 6, 7, 8. The ball mill 4 is gatted, i. H. it consists of several departments with balls of different sizes, which are only indicated in the drawing. The suspension of fine solid particles and water and additives produced in the ball mill flows through the outlet 9 to a pump sump 10 and is pressed from here into a delivery line 12 by means of a pump 11. The viscosity of the suspension can be measured using a suitable measuring device 13, such as. B. the illustrated propeller 14 can be determined. Grain sizes and composition of the solid particles are determined by means of an optical test device 15 in the case of samples taken from the outlet 9 at short intervals by means of a sampling probe 16.

Bei der vorliegenden hochkonzentrierten, feinkörnigen Suspension hat man es normalerweise nicht mit ausgeprägten Konzentrationsprofilen zu tun, so daß eine einfache Meßsonde ausreicht. Die Suspension in dem Teilstrom wird nach der Probenahme mit Wasser verdünnt, bis sie lichtdurchlässig ist, und fließt dann durch die Meßzelle eines Partikelgrößenanalysators. In der Meßzelle wird beispielsweise das Licht eines Lasers an den Partikeln gestreut und reflektiert und durch optische Aufnehmer registriert, deren Meßwerte in einem Rechner 17 mit Sollwerten verglichen werden. Ist eine Änderung der Partikelgrößen notwendig, wird über den Rechner 17 der Antrieb 18 der Kugelmühle 4 beeinflußt, so daß sie ihre Drehzahl bei konstanten Durchsatz ändert. Eine Abweichung in der Suspensionszähigkeit von einem vorgegebenen Wert wird ebenfalls durch den Rechner 17 korrigiert. Über regelbare Ventile 18, 19, 20 in den Leitungen 6, 7, 8 wird die Art und Menge der Additive eingestellt. Eine Änderung des Feuchtigkeitsgehaltes der zugeführten Kohle wird auf der Bandwaage 2 durch einen Feuchtigkeitsmesser 23 beispielsweise mittels Infrarotstrahlen ermittelt. Bei einer Änderung des Feuchtigkeitsgehaltes der Kohle wird die Geschwindigkeit der Bandwaage korrigiert. Über den Rechner 17 wird die Zufuhr von Wasser durch Einstellung des Regelventils 21 in der Zuleitung 5 angepaßt. Die zugegebene Wassermenge wird durch einen Durchflußmesser 22 ermittelt.With the present highly concentrated, fine-grained suspension, one normally does not have to deal with pronounced concentration profiles, so that a simple measuring probe is sufficient. After sampling, the suspension in the partial flow is diluted with water until it is translucent and then flows through the measuring cell of a particle size analyzer. In the measuring cell, for example, the light of a laser is scattered and reflected on the particles and registered by optical pickups, the measured values of which are compared in a computer 17 with target values. If a change in the particle sizes is necessary, the drive 18 of the ball mill 4 is influenced by the computer 17, so that it changes its speed at a constant throughput. A deviation in the suspension viscosity from a predetermined value is also corrected by the computer 17. The type and amount of the additives is set via controllable valves 18, 19, 20 in the lines 6, 7, 8. A change in the moisture content of the coal supplied is determined on the belt scale 2 by a moisture meter 23, for example by means of infrared rays. If the coal moisture content changes, the belt scale speed is corrected. Via the computer 17, the supply of water is adjusted by adjusting the control valve 21 in the feed line 5. The amount of water added is determined by a flow meter 22.

Mit der dargestellten Anlage soll z. B. eine Menge an Suspension von 5 t/h kontinuierlich hergestellt und mit konstantem Druck in die Förderleitung 12 eingespeist werden.With the system shown z. B. continuously produced an amount of suspension of 5 t / h and fed into the delivery line 12 at constant pressure.

Eine gleichmäßige Förderung setzt eine gleichbleibende Zähigkeit voraus. Die abzugebende Suspension soll einen konstanten Anteil an Kohle von 70 % mit einer Körnung bis max. 0,2 mm, aber Überwiegend unter 0,1 mm, enthalten. Diese Merkmale müssen konstant bleiben, damit die Suspension z. B. in einem Brenner verbrannt werden kann.A steady conveyance requires constant toughness. The suspension to be dispensed should have a constant coal content of 70% with a grain size up to max. 0.2 mm, but mostly less than 0.1 mm. These characteristics must remain constant so that the suspension z. B. can be burned in a burner.

Über die Dosierbandwaage 2 wird vorzerkleinerte Kohle mit einer Körnung 6 mm, bei sehr harter Kohle von nur 4 mm, in einem zeitlich konstanten Massenstrom an Kohle, der durch die Geschwindigkeit des Dosierbandes 2 und/oder die Öffnung des Trichters 1 hinreichend genau eingestellt werden kann, zugeführt. Zugleich wird der Feuchtigkeitsgehalt der Kohle ermittelt und bei Änderungen des Feuchtigkeitsgehaltes wird die Geschwindigkeit der Dosierbandwaage so verändert, daß die laufend zugeführte Masse an Kohle konstant bleibt. Ggf. wird auch die Zugabe von Wasser entsprechend dem Feuchtigkeitsgehalt korrigiert. Durch das Wasser aus der Zuleitung 5 wird die Kohle in den Einlauf 3 geschwemmt. In der Kugelmühle 4, die für die o. g. Leistung z. B. einen Durchmesser von 1,4 m und eine Länge von 4,5 m hat, erfolgt die weitere Zerkleinerung der Kohleteile und zugleich deren allseitige Benetzung mit Wasser, wobei die z. B. zur Förderung der Suspensionsbildung zugegebenen Tenside und weitere Additive gut in die Suspension eingemischt werden.Pre-shredded coal with a grain size of 6 mm, with very hard coal of only 4 mm, in a mass flow of coal which is constant over time and which can be set with sufficient accuracy by the speed of the metering belt 2 and / or the opening of the hopper 1, via the metering belt scale 2 , fed. At the same time, the moisture content of the coal is determined and when the moisture content changes, the speed of the dosing belt scale is changed so that the continuously supplied mass of coal remains constant. Possibly. the addition of water is also corrected according to the moisture content. The coal is washed into the inlet 3 by the water from the feed line 5. In the ball mill 4, which for the o. G. Performance z. B. has a diameter of 1.4 m and a length of 4.5 m, the further crushing of the coal parts and at the same time their all-round wetting with water, the z. B. added to promote the formation of suspension surfactants and other additives are mixed well into the suspension.

Führt eine Änderung der Eigenschaften der Kohle zu einer Abweichung der Körnung, kann hierdurch zugleich auch die Zähigkeit verändert werden. Wird aber z. B. zur Vermeidung von Teilchen, die größer als 0,2 mm sind, die Drehzahl der Kugelmühle erhöht, so ergibt eine solche stärkere Zerkleinerung nicht auch die gewünschte Soll-Viskosität. Auch unabhängig von den Einflüssen der Partikelgrößenverteilung kann die Viskosität daher entsprechend einem geeigneten Rechnerprogramm durch eine Steuerung eines oder mehrerer der Ventile 18, 19, 20 für die Additive so korrigiert werden, daß der Soll-Wert der Zähigkeit eingehalten wird.If a change in the properties of the coal leads to a deviation in the grain size, this can also change the toughness. But is z. B. to avoid particles that are larger than 0.2 mm, the speed of the ball mill increases, such a greater size reduction does not also give the desired viscosity. Regardless of the influences of the particle size distribution, the viscosity can therefore be corrected for the additives in accordance with a suitable computer program by controlling one or more of the valves 18, 19, 20 in such a way that the target value of the viscosity is maintained.

Die dargestellte Anlage mit den Überwachungs-und Steuerungsrichtungen schafft somit die Möglichkeit, auch bei sich ändernden Eigenschaften der Grundstoffe eine hochkonzentrierte Suspension mit wenigstens hinsichtlich der Konzentration der Kerngrößen und der Zähigkeit konstanten Merkmalen herzustellen.The system shown with the monitoring and control directions thus create the possibility of producing a highly concentrated suspension with characteristics that are constant at least with regard to the concentration of the core sizes and the toughness, even when the properties of the base materials change.

Claims (7)

1. Method of preparing highly concentrated, fine-grained suspensions with constant features from basic materials with variable properties, wherein the basic materials are solids, a liquid carrier medium and additives, and the suspension is formed in a mixing and comminuting process by means of a ball mill, and subsequently the particle size of the solid particles is analysed and the viscosity of the suspension is examined and, if there are any deviations from the prescribed desired values, the proportions of the basic materials are changed, characterised in that precom- minuted solid material is supplied in a constant mass flow to the mixing and comminuting process, which is effected entirely in a single ball mill, the formed suspension is fed into a feedpipe with a constant solid content and with a constant pressure, and deviations in respect of the distribution of particle size are corrected by changing the speed of the ball mill.
2. Method according to claim 1, characterised in that the moisture content of the supplied, coarser solid particles is determined prior to their being fed to the mixing process, and the proportion of the liquid carrier medium is adjusted in accordance with this moisture content.
3. Method according to claim 1 or 2, characterised in that deviations in respect of the viscosity of the suspension are corrected, with a constant ratio of solid to liquids, by changing the type, quantity and mixture of the additives which are supplied to the mixing and comminuting process.
4. Method according to any of claims 1 to 3, characterised in that pre-comminuted solid particles with a particle size of up to 6 mm are introduced into the mixing and comminuting process and, upon the formation of the suspension, are comminuted to a particle size of up to a maximum of 0.2 mm, approximately two-thirds of the mass of solid particles having a maximum particle size of 0.1 mm.
5. Method according to any of claims 1 to 4, characterised in that a suspension is continuously formed with a constant solid content, which content amounts to between 65 and 75 %, carbon being used as the solid and water being used as the liquid carrier medium.
6. Device for carrying out the method of preparing a highly concentrated, fine-grained suspension with constant features according to any of claims 1 to 5, comprising a ball mill (4), a means (2) for supplying pre-comminuted solids, a supply conduit (5) for supplying the liquid carrier medium and a conduit for additives, as well as means (13, 14) for measuring the viscosity of the suspension and means (15, 16) for determining the particle size, characterised in that the speed of the single ball mill (4) for influencing the comminution of the solids during the mixing and comminuting process is controllable, a plurality of adjustable conduits (6, 7, 8) for additives are disposed above the inlet (3) of the ball mill (4), and the supply conduit (5), which is disposed above the inlet (3) for supplying the liquid carrier medium, is controllable.
7. Device according to claim 6, characterised in that the means for supplying pre-comminuted solids is a metering conveyortype weighing device (2), and a moisture measuring device (23) for determining the moisture in the supplied, pre-comminuted solids is disposed on the conveyortype weighing device (2).
EP85109553A 1985-07-30 1985-07-30 Method and device for the preparation of suspensions with constant indications from basic materials with variable properties Expired EP0210294B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP85109553A EP0210294B1 (en) 1985-07-30 1985-07-30 Method and device for the preparation of suspensions with constant indications from basic materials with variable properties
DE8585109553T DE3563310D1 (en) 1985-07-30 1985-07-30 Method and device for the preparation of suspensions with constant indications from basic materials with variable properties
US06/840,445 US4706892A (en) 1985-07-30 1986-03-17 Method and system for the preparation of a highly concentrated mineral slurry having substantially constant identifying characteristics
CA000504668A CA1294263C (en) 1985-07-30 1986-03-20 Method and system for preparation of a highly concentrated and fine-grained suspension having constant characteristic features
ZA865440A ZA865440B (en) 1985-07-30 1986-07-22 Method and system for preparation of highly concentrated and fine-grained suspension having constant characteristic features
AU60475/86A AU576092B2 (en) 1985-07-30 1986-07-23 Preparation of coal water slurry
JP61176833A JPS6249942A (en) 1985-07-30 1986-07-29 Method and system for preparing high concentration fine particle suspension having constant characteristics

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EP85109553A EP0210294B1 (en) 1985-07-30 1985-07-30 Method and device for the preparation of suspensions with constant indications from basic materials with variable properties

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EP0210294B1 true EP0210294B1 (en) 1988-06-15

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JP (1) JPS6249942A (en)
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DE4129408C1 (en) * 1991-09-04 1992-10-22 Chemische Betriebe Pluto Gmbh, 4690 Herne, De
JPH0569784U (en) * 1991-12-28 1993-09-21 センチュリーメディカル株式会社 Display device in medical equipment
CA2210334C (en) * 1995-02-24 2005-04-26 Exxon Chemical Patents, Inc. Additive blending system and method
US20080202415A1 (en) * 2007-02-28 2008-08-28 David Paul Miller Methods and systems for addition of cellulose ether to gypsum slurry
EP2744877A4 (en) * 2011-08-19 2015-05-06 Gen Electric Fuel slurry heating system and method
ES2630109T3 (en) * 2013-02-28 2017-08-18 Outotec (Finland) Oy Control method of a crushing mill process
CN104609209B (en) * 2015-01-31 2016-09-28 衢州妙凯节能科技有限公司 A kind of steel ball conveyer

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CA1294263C (en) 1992-01-14
JPS6249942A (en) 1987-03-04
EP0210294A1 (en) 1987-02-04
ZA865440B (en) 1987-03-25
US4706892A (en) 1987-11-17
AU6047586A (en) 1987-02-05
AU576092B2 (en) 1988-08-11
DE3563310D1 (en) 1988-07-21

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