EP0302464B1 - Regulating device for a filtering centrifuge - Google Patents
Regulating device for a filtering centrifuge Download PDFInfo
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- EP0302464B1 EP0302464B1 EP88112593A EP88112593A EP0302464B1 EP 0302464 B1 EP0302464 B1 EP 0302464B1 EP 88112593 A EP88112593 A EP 88112593A EP 88112593 A EP88112593 A EP 88112593A EP 0302464 B1 EP0302464 B1 EP 0302464B1
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- European Patent Office
- Prior art keywords
- sensor
- centrifuge
- arm
- coupled
- filling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B13/00—Control arrangements specially designed for centrifuges; Programme control of centrifuges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B11/00—Feeding, charging, or discharging bowls
- B04B11/04—Periodical feeding or discharging; Control arrangements therefor
- B04B11/043—Load indication with or without control arrangements
Definitions
- the invention relates to a device for the result-dependent control of a filter centrifuge.
- a filter centrigue of this type is known from DE-A-25 25 232, in which the layer height of the centrifuge content is tapped by means of a sensor arm.
- the disadvantage of this device is that no statements can be made about the particular nature of the centrifuge contents. It cannot be determined whether the surface of the layer in the rotating sieve drum consists of suspension, washing liquid or solids.
- the object of the invention is therefore to provide a device with which the particular nature of the surface of the centrifuge contents can be determined at any time of operation of the filter centrifuge.
- the invention is based on the knowledge that a suspension has different physical properties than, for example, a solid cake or washing liquid.
- thermocouple which is brought into contact with the surface by the sensor arm. Since each material has certain friction values and correspondingly certain frictional heat values, the measured values generated by the thermocouple always give a precise statement about the nature of the centrifuge content.
- Another advantageous sensor for determining the physical Properties of the centrifuge filling consists of a sensor for determining the electrical conductivity.
- the measurement signals generated by one or more sensors are thus varied in accordance with at least one such physical parameter of the filling surface, which shows different values for liquids, suspensions and solids, whereby in addition to the distinction between the aforementioned media, characteristic values are also obtained for each medium itself can, for example, allow a precise assessment of the respective temperature and the solids concentration in a suspension.
- the sensor arm equipped with at least one sensor is provided with a measuring device for determining the radial position of the filling surface.
- This measuring device expediently consists of a rotary encoder which is coupled to the sensor arm consisting of a sensor contacting the filling surface and a sensor shaft.
- the solid-liquid separation in filter centrifuges can be optimized for any desired operating result.
- the throughput and the residual moisture of the solid cake can be called up at any time in batch operation of the centrifuge.
- FIGS. 1 and 2 show a screening drum 1, the drum interior 2 of which is closed by a closed drum wall 3, a curb ring 4 with curb 5 and a screen jacket 6 is delimited.
- the sieve drum 1 rotates about the centrifuge axis 7 and is surrounded by a housing 8 which is closed by a housing cover 9.
- a measuring device 11 is fastened in the housing cover 9 by means of a flange 10, which carries a sensor arm 12 projecting into the drum interior 2 and a rotation angle sensor 13 located outside the centrifuge housing.
- the sensor arm 12 consists of a sensor 14 and a sensor shaft 15. At the free end of the sensor 14 there is the contact surface 16 in which one or more sensors are arranged which generate a measurement signal representing the physical properties of the centrifuge filling.
- a measuring signal ⁇ representing the position of the contact surface 16 or a layer thickness of the centrifuge filling is generated by the rotary angle sensor 13.
- the centrifuge filling consists of a solid layer or a solid cake 17, the layer thickness (cake height) of which is denoted by h k .
- the solid layer is overlaid by a liquid layer 18, which can consist of washing liquid or filtrate liquid.
- the sensor arm 12 can be pivoted in the direction of the arrows 19. For the measurement, the sensor arm 12 is pressed onto the filling surface 20 with little force, so that the contact surface 16 always remains in contact with the filling surface 20.
- the sensor 14 is arranged in the trailed position with respect to the direction of rotation of the drum (arrow 21).
- the axis 22 of the sensor shaft 15 is parallel to the centrifuge axis 7.
- the sectional view of the measuring device 11 according to FIG. 3 shows the sensor 14, in whose contact surface 16 a thermocouple 23 is arranged.
- the sensor 14 is shown in FIG. 4 in cross section like a Knife edge designed, the front edge 24 of the sensor 14 corresponding to the cutting edge being directed counter to the direction of rotation (arrow 21) of the screening drum 1.
- This configuration and arrangement of the contact area of the sensor 14 has the advantage that the contact with the filling surface 20 on the one hand provides reliable measurement results and on the other hand can be carried out largely without splashing.
- the sensor 14 is detachably connected to the sensor shaft 15 via a plug 25 which has both mechanical and electrical coupling devices.
- the sensor shaft 15 is pivotally mounted and leads the electrical signal line of the thermocouple 23 to the outside.
- the rotation angle sensor 13 is also connected to the sensor shaft 15.
- the signal lines for the measurement signal generated by the thermocouple 23 and the measurement signal ⁇ generated by the rotary encoder 13 are connected to a computer which delivers output signals for optimal centrifuge control in accordance with stored characteristic curves.
- the diagram shown in FIG. 5 shows the temperature curve displayed by the thermocouple 23, with the sensor arm 12 at different pivoting positions.
- T a is the temperature when the sensor arm is pivoted freely into the centrifuge space
- T b the temperature when the sensor arm comes into contact with the surface 20 of the liquid layer 18 and designated by T c the temperature which arises when the liquid from the liquid layer 18 is immersed in the solid cake.
- the points F1 E and F E mark exactly the point in time when the temperature sensor comes into contact with the liquid surface and when the liquid is immersed in the solid cake, whereby the rotary angle sensor provides a precise value for the respective layer height of the centrifuge filling at all times.
- a variable, self-adjustable cycle time with a precise end time (in this case, the immersion point F E ) is possible, whereupon subsequent steps can be followed with an exactly precise time sequence. Thereafter, when the immersion point F E is set, further filling processes with suspension can follow in repeated sequence until the filter cake has reached a layer thickness in relation to the beltline 5, in which there is still enough space for the washing agent to be applied to the solid cake in one or more cycles .
- the filtration speed and the volume of the solid cake can be measured, it is also possible to determine the throughputs of suspension liquid, washing medium and the remaining amount of solid or to be discharged with the peeling device in connection with a computer. Likewise, the residual moisture content of the solid can be queried at any time.
- the dry spin cycle follows, in which the washing medium still present in the solid cake is removed. This phase was previously part of a fixed cycle time without taking into account the fluctuations caused by different filtration and washing times.
- the time for dry spinning is determined by the computer in accordance with characteristic curves in which empirically determined influencing variables are taken into account.
- Such an influencing variable can be given in the filtering properties of the so-called base layer, which changes from batch to batch, and which remains on the screen surface after each peeling process after the dry centrifugation and which is increasingly compacted, thus becoming increasingly impermeable and accordingly requiring an increasingly longer dry centrifuging time.
- the invention enables variable and self-adjusting cycle times, with which a centrifuge can be applied to any desired operating result with little effort, e.g. low residual moisture, high filtration speed, low spin drying time and the like can be optimized.
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Description
Die Erfindung bezieht sich auf eine Vorrichtung zum ergebnisabhängigen Steuern einer Filterzentrifuge.The invention relates to a device for the result-dependent control of a filter centrifuge.
Eine Filterzentrigue dieser Art ist aus der DE-A-25 25 232 bekannt, bei der die Schichthöhe des Zentrifugeninhalts mittels eines Fühlerarms abgegriffen wird. Der Nachteil dieser Vorrichtung besteht darin, daß keine Aussagen über die jeweilige Beschaffenheit des Zentrifugeninhalts erzielt werden können. Es ist somit nicht festzustellen, ob die Oberfläche der in der rotierenden Siebtrommel befindlichen Schicht aus Suspension, Waschflüssigkeit oder Feststoffen besteht.A filter centrigue of this type is known from DE-A-25 25 232, in which the layer height of the centrifuge content is tapped by means of a sensor arm. The disadvantage of this device is that no statements can be made about the particular nature of the centrifuge contents. It cannot be determined whether the surface of the layer in the rotating sieve drum consists of suspension, washing liquid or solids.
Die Aufgabe der Erfindung besteht daher in der Schaffung einer Vorrichtung, mit der zu jedem Betriebszeitpunkt der Filterzentrifuge die jeweilige Beschaffenheit der Oberfläche des Zentrifugeninhalts bestimmt werden kann.The object of the invention is therefore to provide a device with which the particular nature of the surface of the centrifuge contents can be determined at any time of operation of the filter centrifuge.
Diese Aufgabe wird durch die im Anspruch 1 angezeigten Maßnahmen gelöst. Die Erfindung basiert dabei auf der Erkenntnis, daß eine Suspension andere physikalische Eigenschaften aufweist als beispielsweise ein Feststoffkuchen oder Waschflüssigkeit.This object is achieved by the measures indicated in
Ein besonders vorteilhafter Weg zur Feststellung der Beschaffenheit und zur verzögerungsfreien Feststellung einer Beschaffenheitsänderung der Oberfläche des Zentrifugeninhalts ergibt sich durch einen aus einem Thermoelement bestehenden Meßfühler, der mit dem Fühlerarm mit der Oberfläche in Kontakt gebracht wird. Da jedem Stoff bestimmte Reibungswerte und dementsprechend bestimmte Reibungswärmewerte zuzuordnen sind, geben die vom Thermoelement erzeugten Meßwerte jederzeit eine präzise Aussage über die Beschaffenheit des Zentrifugeninhalts.A particularly advantageous way of determining the quality and of determining the change in the quality of the surface of the centrifuge contents without delay results from a sensor consisting of a thermocouple which is brought into contact with the surface by the sensor arm. Since each material has certain friction values and correspondingly certain frictional heat values, the measured values generated by the thermocouple always give a precise statement about the nature of the centrifuge content.
Ein weiterer vorteilhafter Meßfühler zur Ermittlung der physikalischen Eigenschaften der Zentrifugenfüllung besteht aus einem Sensor zur Ermittlung der elektrischen Leitfähigkeit.Another advantageous sensor for determining the physical Properties of the centrifuge filling consists of a sensor for determining the electrical conductivity.
Die von einem oder mehreren Meßfühlern erzeugten Meßsignale werden somit nach Maßgabe mindestens eines solchen physikalischen Parameters der Füllungsoberfläche variiert, welcher für Flüssigkeiten, Suspensionen und Feststoffe jeweils unterschiedliche Werte zeigt, wobei neben der Unterscheidung zwischen den vorgenannten Medien auch für jedes Medium selbst charakteristische Kennwerte erzielt werden können, die beispielsweise bei einer Suspension eine genaue Beurteilung der jeweiligen Temperatur und der Feststoffkonzentration erlauben.The measurement signals generated by one or more sensors are thus varied in accordance with at least one such physical parameter of the filling surface, which shows different values for liquids, suspensions and solids, whereby in addition to the distinction between the aforementioned media, characteristic values are also obtained for each medium itself can, for example, allow a precise assessment of the respective temperature and the solids concentration in a suspension.
In einer bevorzugten Ausführungsform der Erfindung ist der mit mindestens einem Meßfühler ausgestattete Fühlerarm mit einer Meßeinrichtung zur Ermittlung der radialen Position der Füllungsoberfläche versehen. Zweckmäßigerweise besteht diese Meßeinrichtung aus einem Drehwinkelgeber, der mit dem aus einem die Füllungsoberfläche kontaktierenden Fühler und einer Fühlerwelle bestehenden Fühlerarm gekoppelt ist.In a preferred embodiment of the invention, the sensor arm equipped with at least one sensor is provided with a measuring device for determining the radial position of the filling surface. This measuring device expediently consists of a rotary encoder which is coupled to the sensor arm consisting of a sensor contacting the filling surface and a sensor shaft.
Mit der Kombination der vom Meßfühler und der vom Drehwinkelgeber zeitgleich erhaltenen Werte über die Beschaffenheit und die Schichthöhe der Zentrifugenfüllung kann die Fest-Flüssig-Trennung in Filterzentrifugen für jedes gewünschte Betriebsergebnis optimiert werden.With the combination of the values obtained from the sensor and from the rotary encoder at the same time about the nature and the layer height of the centrifuge filling, the solid-liquid separation in filter centrifuges can be optimized for any desired operating result.
Für eine derartige, auf ein bestimmtes Betriebsergebnis optimierte Steuerung einer Filterzentrifuge ist es von entscheidender Bedeutung, daß der Zeitpunkt, in dem die Suspensionsflüssigkeit in den bereits abfiltrierten Feststoffkuchen eindringt bzw. in dem die Oberfläche der Suspensionsflüssigkeit im Feststoffkuchen verschwindet, exakt bestimmbar ist. Dieser mit Eintauchpunkt (FE) bezeichnete Zeitpunkt macht sich bei einem erfindungsgemäß aus einem Thermoelement bestehenden Meßfühler in einem besonders deutlichen Temperatursprung bemerkbar, da im Vergleich zur Suspensionflüssigkeit beim Reibungskontakt mit der Feststoffkuchen-Oberfläche eine wesentlich höher Reibungswärme erzeugt wird.For such a control of a filter centrifuge that is optimized for a specific operating result, it is of crucial importance that the point in time at which the suspension liquid penetrates into the already filtered solid cake or at which the surface of the suspension liquid disappears in the solid cake can be determined exactly. This point in time, which is designated the immersion point (F E ), is noticeable in a particularly clear temperature jump in the case of a sensor consisting of a thermocouple according to the invention, since, in comparison with the suspension liquid, frictional contact with the solid cake surface produces a significantly higher frictional heat.
Da jeweils zeitgleich bzw. zeitkorrelierend mit dem Zeitpunkt des Eintauchpunktes (FE) ein die Höhe (hk) des abfiltrierten Feststoffkuchens bestimmendes Meßsignal vorliegt, lassen sich in Verbindung mit einem Rechner trotz eventueller Schwankungen in der aufgegebenen Suspension oder Änderungen der Füll-, Filtrations-, Wasch- und Schälbedingungen optimale Ergebnisse hinsichtlich einer gewünschten Restfeuchte bei optimalen Zykluszeiten für das Befüllen der Zentrifuge, das Waschen der Zentrifugenfüllung und das Trockenschleudern des Feststoffkuchens nach Erreichen des Eintauchpunktes (FE) erzielen.Since there is a measurement signal determining the height (h k ) of the filtered solid cake at the same time or correlating with the time of the immersion point (F E ), it is possible to use a computer in spite of possible fluctuations in the suspension or changes in the filling or filtration -, washing and peeling conditions achieve optimum results with regard to a desired residual moisture with optimal cycle times for filling the centrifuge, washing the centrifuge filling and drying the solid cake after reaching the immersion point (F E ).
Darüberhinaus kann im Chargenbetrieb der Zentrifuge zu jedem Zeitpunkt die Durchsatzleistung und die Restfeuchte des Feststoffkuchens abgerufen werden.In addition, the throughput and the residual moisture of the solid cake can be called up at any time in batch operation of the centrifuge.
In der nachfolgenden Beschreibung ist anhand der Zeichnung ein Anwendungs- und Ausführungsbeispiel näher erläutert. Es zeigen :
- Fig. 1
- in schematischer Darstellung einen Teilbereich einer mit einem Fühlerarm ausgestatteten Filterzentrifuge im Schnitt,
- Fig. 2
- die Schnittansicht gemäß der Schnittlinie II-II in Fig. 1,
- Fig. 3
- den Fühlerarm gemäß Fig. 1 in vergrößertem Maßstab,
- Fig. 4
- die Querschnittsdarstellung des Fühlerarms gemäß der Schnittlinie IV-IV in Fig. 3,
- Fig. 5
- ein den Temperaturverlauf beim Erreichen des Eintauchpunktes (FE) repräsentierendes Diagramm.
- Fig. 1
- a schematic representation of a section of a filter centrifuge equipped with a sensor arm in section,
- Fig. 2
- the sectional view along the section line II-II in Fig. 1,
- Fig. 3
- 1 on an enlarged scale,
- Fig. 4
- the cross-sectional view of the sensor arm according to the section line IV-IV in Fig. 3,
- Fig. 5
- a diagram representing the temperature profile when the immersion point (F E ) is reached.
Die Figuren 1 und 2 zeigen eine Siebtrommel 1 deren Trommelinnenraum 2 von einer geschlossenen Trommelwand 3, einem Bordring 4 mit Bordkante 5 und einem Siebmantel 6 umgrenzt wird. Die Siebtrommel 1 rotiert um die Zentrifugenachse 7 und ist von einem Gehäuse 8 umgeben, das mit einem Gehäusedeckel 9 verschlossen ist. Im Gehäusedeckel 9 ist mittels eines Flansches 10 eine Meßeinrichtung 11 befestigt, die einen in den Trommelinnenraum 2 ragenden Fühlerarm 12 und einen außerhalb des Zentrifugengehäuses gelegenen Drehwinkelgeber 13 trägt.FIGS. 1 and 2 show a
Der Fühlerarm 12 besteht aus einem Fühler 14 und einer Fühlerwelle 15. Am freien Ende des Fühlers 14 befindet sich die Kontaktfläche 16 in der einer oder mehrere Meßfühler angeordnet sind, die ein die physikalischen Beschaffenheitswerte der Zentrifugenfüllung repräsentierendes Meßsignal erzeugen.The
Von Drehwinkelgeber 13 wird ein die Stellung der Kontaktfläche 16 bzw. ein die Schichtdicke der Zentrifugenfüllung repräsentierendes Meßsignal β erzeugt.A measuring signal β representing the position of the
Die Zentrifugenfüllung besteht aus einer Feststoffschicht bzw. einem Feststoffkuchen 17, dessen Schichtdicke (Kuchenhöhe) mit hk bezeichnet ist. Die Feststoffschicht wird von einer Flüssigkeitsschicht 18 überlagert, die aus Waschflüssigkeit oder aus Filtratflüssigkeit bestehen kann.The centrifuge filling consists of a solid layer or a
Der Fühlerarm 12 ist in Richtung der Pfeile 19 verschwenkbar. Zur Messung wird der Fühlerarm 12 mit geringer Kraft auf die Füllungsoberfläche 20 gedrückt, so daß die Kontaktfläche 16 stets in Berührung mit der Füllungsoberfläche 20 bleibt. Der Fühler 14 ist in Bezug auf die Trommeldrehrichtung (Pfeil 21) in geschleppter Stellung angeordnet. Die Achse 22 der Fühlerwelle 15 liegt parallel zur Zentrifugenachse 7.The
Die Schnittdarstellung der Meßeinrichtung 11 nach Fig. 3 zeigt den Fühler 14, in dessen Kontaktfläche 16 ein Thermoelement 23 angeordnet ist. Der Fühler 14 ist gemäß Fig. 4 im Querschnitt nach Art einer Messerschneide gestaltet, wobei die der Schneidkante entsprechende Vorderkante 24 des Fühlers 14 entgegen der Drehrichtung (Pfeil 21) der Siebtrommel 1 gerichtet ist. Diese Ausgestaltung und Anordnung des Kontaktbereiches des Fühlers 14 hat den Vorteil, daß der Berührungskontakt mit der Füllungsoberfläche 20 zum einen sichere Meßergebnisse liefert und zum anderen weitestgehend spritzfrei erfolgen kann.The sectional view of the
Der Fühler 14 ist mit der Fühlerwelle 15 über einen Stecker 25 lösbar verbunden, der sowohl mechanische als auch elektrische Kopplungseinrichtungen aufweist. Die Fühlerwelle 15 ist schwenkbar gelagert und führt die elektrische Signalleitung des Thermoelementes 23 nach außen. Mit der Fühlerwelle 15 ist ferner der Drehwinkelgeber 13 verbunden. Die Signalleitungen für das vom Thermoelement 23 erzeugte Meßsignal und das vom Drehwinkelgeber 13 erzeugte Meßsignal β sind an einen Rechner angeschlossen, der nach Maßgabe eingespeicherter Kennlinien Ausgangssignale für eine optimale Zentrifugensteuerung liefert.The
Das in Fig. 5 dargestellte Diagramm zeigt den vom Thermoelement 23 angezeigten Temperaturverlauf, bei verschiedenen Schwenkstellungen des Fühlerarms 12. Mit Ta ist die Temperatur bei frei in den Zentrifugenraum geschwenktem Fühlerarm, mit Tb die Temperatur bei Kontakt des Fühlerarms mit der Oberfläche 20 Flüssigkeitsschicht 18 und mit Tc die Temperatur bezeichnet, die sich einstellt, wenn die Flüssigkeit aus der Flüssigkeitsschicht 18 in den Feststoffkuchen eingetaucht ist.The diagram shown in FIG. 5 shows the temperature curve displayed by the
Die Punkte F1E und FE kennzeichnen dabei exakt den Zeitpunkt, wenn der Temperaturfühler mit der Flüssigkeitsoberfläche in Kontakt kommt und wenn die Flüssigkeit in den Feststoffkuchen eintaucht, wobei durch den Drehwinkelgeber zu jedem Zeitpunkt jeweils ein genauer Wert über die jeweilige Schichthöhe der Zentrifugenfüllung vorliegt.The points F1 E and F E mark exactly the point in time when the temperature sensor comes into contact with the liquid surface and when the liquid is immersed in the solid cake, whereby the rotary angle sensor provides a precise value for the respective layer height of the centrifuge filling at all times.
Im nachfolgenden wird in Gegenüberstellung zum Stand der Technik der chargenweise Betrieb einer Filterzentrifuge erläutert, der im wesentlichen durch die Verfahrensschritte
- Füllen der Siebtrommel mit Suspension
- Waschen mit Waschflüssigkeit
- Trockenschleudern des Feststoffkuchens und
- Schälen des Feststoffkuchens mittels einer Schälvorrichtung (nicht dargestellt)
- Fill the sieve drum with suspension
- Wash with washing liquid
- Dry spinning the solid cake and
- Peeling the solid cake using a peeling device (not shown)
Nach dem Füllen der Siebtrommel mit Suspension baut sich ein Filterkuchen bzw. ein Feststoffkuchen auf, durch den die Suspensionflüssigkeit hindurchfiltriert, wobei der Zeitpunkt FE, zu dem die Suspensionsflüssigkeit durch die Oberfläche des Filterkuchens verschwindet, exakt angezeigt wird.After the sieve drum has been filled with suspension, a filter cake or a solid cake is built up, through which the suspension liquid filters, the time F E , at which the suspension liquid disappears through the surface of the filter cake, being displayed exactly.
Dieser Zeitpunkt ist mit den bisher bekannten Verfahren zur Bestimmung des Eintauchpunktes FE überhaupt nicht oder nur in sehr unzureichendem Maße zu ermitteln, da aufgrund des starken Suspensions - Sprühnebels im Trommelinnenraum herkömmliche Meßmethoden oder die Beobachtungsmethode durch eine Bedienungsperson meist versagen.This point in time cannot be determined at all, or only to a very inadequate extent, with the previously known methods for determining the immersion point F E , since conventional measurement methods or the observation method by an operator usually fail due to the strong suspension spray mist in the interior of the drum.
Die Filterzentrifugen werden daher überwiegend nach fest vorgegebenen Zeiten gesteuert. Dies kann zu folgenden Nachteilen führen :
- 1. Die Schleuderzeit ist zu lang. Neben dem Nachteil, daß unnötige Betriebszeit aufzuwenden ist, besteht die Gefahr, daß Luft in den Filterkuchen eindringt, wodurch sich ein schlechter Wascheffekt ergibt.
- 2. Die Schleuderzeit ist zu kurz. Hierbei erfolgt noch eine Vermischung von Mutterlauge mit Waschmedium, wodurch ebenfalls ein schlechter Wascheffekt in Kauf zu nehmen ist.
- 1. The spin time is too long. In addition to the disadvantage that unnecessary operating time has to be expended, there is the risk that air penetrates into the filter cake, which results in a poor washing effect.
- 2. The spin time is too short. The mother liquor is mixed with the washing medium, which also means that a bad washing effect has to be accepted.
Nach der vorliegenden Erfindung hingegen ermöglicht sich eine variable, selbst einstellbare Zykluszeit mit präzisem Endzeitpunkt (im hier gegebenen Fall der Eintauchpunkt FE), worauf nachfolgende Schritte mit gleichgeartet präzisem Zeitablauf nachgeschaltet werden können. Danach können sich bei Einstellen des Eintauchpunktes FE in mehrmaliger Abfolge weitere Füllvorgänge mit Suspension anschließen bis der Filterkuchen in Bezug auf die Bordkante 5 eine Schichtdicke erreicht hat, bei der noch genügend Raum für die Beaufschlagung des Feststoffkuchens mit Waschmedium in einem oder mehreren Zyklen gegeben ist.According to the present invention, on the other hand, a variable, self-adjustable cycle time with a precise end time (in this case, the immersion point F E ) is possible, whereupon subsequent steps can be followed with an exactly precise time sequence. Thereafter, when the immersion point F E is set, further filling processes with suspension can follow in repeated sequence until the filter cake has reached a layer thickness in relation to the
Aufgrund der Tatsache, daß die Filtrationsgeschwindigkeit und das Volumen des Feststoffkuchens gemessen werden, kann, ist man darüberhinaus in die Lage versetzt, in Verbindung mit einem Rechner jederzeit die Durchsatzmengen von Suspensionsflüssigkeit, Waschmedium und die verbleibende oder mit der Schälvorrichtung auszutragende Feststoffmenge zu bestimmen. Desgleichen ist jederzeit eine Abfrage der Restfeuchte des Feststoffes möglich.Due to the fact that the filtration speed and the volume of the solid cake can be measured, it is also possible to determine the throughputs of suspension liquid, washing medium and the remaining amount of solid or to be discharged with the peeling device in connection with a computer. Likewise, the residual moisture content of the solid can be queried at any time.
Nach Bestimmung des Eintauchpunktes FE nach dem letzten Waschvorgang schließt sich das Trockenschleudern an, bei dem das noch im Feststoffkuchen vorhandene Waschmedium entfernt wird. Diese Phase war bisher Bestandteil einer fest vorgegebenen Zykluszeit ohne Berücksichtigung der durch unterschiedliche Filtrier- und Waschzeiten gegebenen Schwankungen.After determining the immersion point F E after the last washing process, the dry spin cycle follows, in which the washing medium still present in the solid cake is removed. This phase was previously part of a fixed cycle time without taking into account the fluctuations caused by different filtration and washing times.
Nach der präzisen Erfassung der Filtrierzeit wird die Zeit zum Trockenschleudern vom Rechner nach Maßgabe von Kennlinien bestimmt, in denen empirisch erfaßte Einflußgrößen berücksichtigt sind. Eine derartige Einflußgröße kann in den von Charge zu Charge sich verändernden Filtriereigenschaften der sogenannten Grundschicht gegeben sein, die nach jedem, dem Trockenschleudern nachgeschalteten Schälvorgang auf der Siebfläche verbleibt und die sich zunehmend verdichtet, somit immer undurchlässiger wird und eine dementsprechend immer länger dauernde Trockenschleuderzeit erfordert.After the precise recording of the filtering time, the time for dry spinning is determined by the computer in accordance with characteristic curves in which empirically determined influencing variables are taken into account. Such an influencing variable can be given in the filtering properties of the so-called base layer, which changes from batch to batch, and which remains on the screen surface after each peeling process after the dry centrifugation and which is increasingly compacted, thus becoming increasingly impermeable and accordingly requiring an increasingly longer dry centrifuging time.
Abgesehen von den vom Rechner über die Kennlinien erzeugten Steuerungsgrößen ermöglicht die Erfindung variable und sich selbst einstellende Zykluszeiten, womit eine Zentrifuge mit geringem Aufwand auf jedes gewünschte Betriebsergebnis, wie z.B. geringe Restfeuchte, hohe Filtrationsgeschwindigkeit, geringe Trockenschleuderzeit und dergleichen optimiert werden kann.In addition to the control variables generated by the computer via the characteristic curves, the invention enables variable and self-adjusting cycle times, with which a centrifuge can be applied to any desired operating result with little effort, e.g. low residual moisture, high filtration speed, low spin drying time and the like can be optimized.
Claims (10)
- A device for the result-dependent control of a filter centrifuge according to a measured signal generated by a pivotable sensor arm which is in contact with the filling surface of the centrifuge content, characterised in that the sensor arm (12) has on its contact surface (16) at least one measuring sensor which ascertains one or a plurality of physical values relating to the composition of the surface (20) of the contents of the centrifuge.
- A device according to Claim 1 characterised in that the measuring sensor is a temperature measuring sensor.
- A device according to Claim 2, characterised in that the temperature measuring sensor is a thermosensitive element (23).
- A device according to Claim 1, characterised in that the measuring sensor is a sensor for ascertaining electrical conductivity
- A device according to one of Claims 1 to 4, characterised in that the sensor arm (12) is coupled to a measuring arrangement which indicates the radial position of the contact surface (16) on the surface (20) of the filling or which indicates the thickness of the centrifuge contents.
- A device according to one of Claims 1 to 5, characterised in that the sensor arm (12) consists of a sensor (14) disposed at right-angles to the centrifuge axis (7) and a sensor shaft (15) rotatably mounted in the centrifuge housing (8) and parallel with the centrifuge axis (7).
- A device according to Claim 6, characterised in that the sensor (14) is coupled to the sensor shaft (15) by means of a separable plug-in connection (25).
- A device according to one of claims 5 to 7, characterised in that the sensor shaft (15) is coupled to an angle of rotation transmitter (13), for example a rotary potentiometer.
- A device according to one of Claims 5 to 8, characterised in that the sensor shaft (15) is coupled to a positioning drive.
- A device according to one of Claims 1 to 9, characterised in that the sensor arm (12) is at least in the region of its contact surface (16) constructed in cross-section after the manner of a knife edge, the front edge (24) of the sensor (14) which corresponds to the knife edge being directed against the direction of rotation of the centrifuge (arrow 21).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19873726227 DE3726227A1 (en) | 1987-08-07 | 1987-08-07 | DEVICE FOR RESULTS CONTROLLING A FILTER CENTRIFUGE |
| DE3726227 | 1987-08-07 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0302464A2 EP0302464A2 (en) | 1989-02-08 |
| EP0302464A3 EP0302464A3 (en) | 1990-01-17 |
| EP0302464B1 true EP0302464B1 (en) | 1991-11-06 |
Family
ID=6333233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88112593A Expired - Lifetime EP0302464B1 (en) | 1987-08-07 | 1988-08-03 | Regulating device for a filtering centrifuge |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4900453A (en) |
| EP (1) | EP0302464B1 (en) |
| JP (1) | JP2540358B2 (en) |
| DE (1) | DE3726227A1 (en) |
| ES (1) | ES2026607T3 (en) |
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| EP0456861A1 (en) * | 1989-07-29 | 1991-11-21 | Krauss-Maffei Aktiengesellschaft | Regulating device for a filtering centrifuge |
| DE3940053A1 (en) * | 1989-12-04 | 1991-06-06 | Krauss Maffei Ag | METHOD AND DEVICE FOR DRAWING LIQUIDS FROM A CENTRIFUGE |
| DE3940057A1 (en) * | 1989-12-04 | 1991-06-06 | Krauss Maffei Ag | METHOD AND DEVICE FOR OPERATING A FILTER CENTRIFUGE |
| DE4004584A1 (en) * | 1990-02-15 | 1991-08-22 | Krauss Maffei Ag | Horizontal centrifugal slurry filter removes filtrate and cake - in sequence controlled by internal vibration-responsive sensors |
| FR2665379B1 (en) * | 1990-07-31 | 1993-08-13 | Fives Cail Babcock | METHOD FOR THE AUTOMATED DRIVING OF A CENTRIFUGAL SPINNER WITH DISCONTINUOUS OPERATION. |
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| NO301562B1 (en) * | 1994-12-21 | 1997-11-10 | Exxon Production Research Co | Device for measuring |
| DE19703353C2 (en) * | 1997-01-30 | 2003-10-09 | Krauss Maffei Process Technolo | Process for operating a filter centrifuge |
| DE19716128C1 (en) * | 1997-04-17 | 1999-01-21 | Krauss Maffei Ag | Process to control an intermittently-operated filter centrifuge separating liquids and solids |
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| DE102004037414A1 (en) * | 2004-07-30 | 2006-03-23 | Mann + Hummel Gmbh | centrifugal |
| EP2910258B1 (en) * | 2005-02-07 | 2018-08-01 | Hanuman LLC | Platelet rich plasma concentrate apparatus |
| WO2006086201A2 (en) | 2005-02-07 | 2006-08-17 | Hanuman Llc | Platelet rich plasma concentrate apparatus and method |
| US7866485B2 (en) | 2005-02-07 | 2011-01-11 | Hanuman, Llc | Apparatus and method for preparing platelet rich plasma and concentrates thereof |
| DE102005028832A1 (en) * | 2005-06-15 | 2006-12-28 | Fima Maschinenbau Gmbh | Centrifuge device with improved process analysis technology |
| US8567609B2 (en) | 2006-05-25 | 2013-10-29 | Biomet Biologics, Llc | Apparatus and method for separating and concentrating fluids containing multiple components |
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| EP2620139B1 (en) | 2008-02-27 | 2016-07-20 | Biomet Biologics, LLC | Interleukin-1 receptor antagonist rich solutions |
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| US8591391B2 (en) | 2010-04-12 | 2013-11-26 | Biomet Biologics, Llc | Method and apparatus for separating a material |
| US9642956B2 (en) | 2012-08-27 | 2017-05-09 | Biomet Biologics, Llc | Apparatus and method for separating and concentrating fluids containing multiple components |
| US20140271589A1 (en) | 2013-03-15 | 2014-09-18 | Biomet Biologics, Llc | Treatment of collagen defects using protein solutions |
| US10208095B2 (en) | 2013-03-15 | 2019-02-19 | Biomet Manufacturing, Llc | Methods for making cytokine compositions from tissues using non-centrifugal methods |
| US9895418B2 (en) | 2013-03-15 | 2018-02-20 | Biomet Biologics, Llc | Treatment of peripheral vascular disease using protein solutions |
| US10143725B2 (en) | 2013-03-15 | 2018-12-04 | Biomet Biologics, Llc | Treatment of pain using protein solutions |
| US9950035B2 (en) | 2013-03-15 | 2018-04-24 | Biomet Biologics, Llc | Methods and non-immunogenic compositions for treating inflammatory disorders |
| US9713810B2 (en) | 2015-03-30 | 2017-07-25 | Biomet Biologics, Llc | Cell washing plunger using centrifugal force |
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| EP3332266A4 (en) * | 2015-08-03 | 2019-04-17 | Commonwealth Scientific and Industrial Research Organisation | Monitoring systems and methods |
| EP3877089B1 (en) | 2018-11-06 | 2022-10-26 | Ferrum Process Systems AG | Method for operating a centrifuge device |
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-
1987
- 1987-08-07 DE DE19873726227 patent/DE3726227A1/en active Granted
-
1988
- 1988-08-03 EP EP88112593A patent/EP0302464B1/en not_active Expired - Lifetime
- 1988-08-03 ES ES198888112593T patent/ES2026607T3/en not_active Expired - Lifetime
- 1988-08-05 US US07/230,276 patent/US4900453A/en not_active Expired - Lifetime
- 1988-08-08 JP JP63196224A patent/JP2540358B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0302464A2 (en) | 1989-02-08 |
| ES2026607T3 (en) | 1992-05-01 |
| DE3726227C2 (en) | 1991-03-14 |
| DE3726227A1 (en) | 1989-02-16 |
| JPS6467270A (en) | 1989-03-13 |
| EP0302464A3 (en) | 1990-01-17 |
| US4900453A (en) | 1990-02-13 |
| JP2540358B2 (en) | 1996-10-02 |
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