EP0177838B1 - Device for introducing flocculants into sludge inside the loading chamber of a centrifuge - Google Patents

Device for introducing flocculants into sludge inside the loading chamber of a centrifuge Download PDF

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Publication number
EP0177838B1
EP0177838B1 EP85112142A EP85112142A EP0177838B1 EP 0177838 B1 EP0177838 B1 EP 0177838B1 EP 85112142 A EP85112142 A EP 85112142A EP 85112142 A EP85112142 A EP 85112142A EP 0177838 B1 EP0177838 B1 EP 0177838B1
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EP
European Patent Office
Prior art keywords
sludge
flocculant
feed tube
inlet chamber
centrifuge
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EP85112142A
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German (de)
French (fr)
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EP0177838A3 (en
EP0177838A2 (en
Inventor
Stephan Cläsgens
Heinz Kulle
Reinhold Dr. Schilp
Wolfgang Epper
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Kloeckner Humboldt Deutz AG
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Kloeckner Humboldt Deutz AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • 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
    • B04B11/02—Continuous feeding or discharging; Control arrangements therefor

Definitions

  • the invention relates to a device for introducing flocculants into the sludge inside the inlet chamber of a centrifuge, consisting of a flocculant feed pipe which is passed through the sludge feed pipe and projects into the inlet chamber of the centrifuge provided with sludge through-openings, wherein in the inlet chamber at a distance from the mouth of the sludge feed pipe is arranged a baffle perpendicular to the mouth of the sludge feed pipe.
  • the object of the invention is therefore to provide a device for introducing flocculants into the sludge within the inlet chamber of a centrifuge, which enables the flocculant to be optimally mixed with the sludge while using as little flocculant as possible.
  • the baffle is provided with a baffle cone centrally directed onto the mouth of the sludge feed pipe, and in that the flocculant feed pipe in the sludge feed pipe is axially adjustable and / or rotatably held so that its outlet opening onto the area is directed between the baffle and the sludge passage openings arranged at a distance therefrom in the inlet chamber.
  • baffle wall according to the invention is provided with a baffle cone centrally directed onto the mouth of the sludge feed pipe, an all-round uniform distribution of the sludge is very advantageously achieved in the inlet chamber, into which the flocculants can be introduced and mixed with it also equally .
  • the flocculant feed pipe in the sludge feed pipe is axially adjustable and / or rotatably held so that its outlet opening is directed to the area between the baffle and the sludge passage openings arranged at a distance therefrom in the inlet chamber very advantageously the flocculant jet emerging from the nozzle-shaped outlet opening of the flocculant feed pipe is directed or adjusted precisely to the sludge flow located in the peripheral region of the inlet chamber, in which the flocculant jet penetrates deeply into the sludge and thereby mixes intimately with the sludge.
  • this area lies between the baffle wall of the inlet chamber and the sludge passage openings in the chamber, specifically where the sludge flow undergoes a strong deflection in the opposite direction to the inlet direction.
  • the intimate mixing of the flocculant with the sludge that has already taken place in this area is intensified by the subsequent subsequent strong redirection and circulation of the sludge in the area of the passage openings.
  • the flocculant addition can very advantageously be reduced to the minimum required in each case, as a result of which, in comparison with the previously known flocculant supply devices, savings in flocculants can be achieved in some cases of up to over 50%.
  • the flocculant feed tube consists of several parts which are arranged to be pluggable or telescopically displaceable. This configuration of the flocculant feed tube makes it easy to remove and install the flocculant feed tube in a small space.
  • the flocculant supply pipe consists of a flexible or elastic material, in particular rubber.
  • a flocculant feed pipe is particularly characterized by the easy handling during installation and removal and by the self-sealing at the through opening in the sludge feed pipe.
  • the centrifuge consists of a centrifuge drum 1, in which a screw conveyor 2 is arranged coaxially, the shaft of which is designed as a hollow shaft 3 and is externally surrounded by the screw spiral 4.
  • the hollow shaft 3 is closed by an end wall 5, which is provided in the central region with an opening 6 through which a stationary arranged sludge feed pipe 7 is passed.
  • a baffle 8 with baffle cone 9 is installed in the hollow shaft 3 at a distance from the end wall 5, which together with the end wall 5 and the hollow shaft 3 forms an inlet chamber 10 for the sludge.
  • Provided in the hollow shaft 3 in the area of this inlet chamber 10 are a plurality of openings 11 evenly distributed over the circumference for the sludge to pass into the centrifuge drum 1.
  • a flocculant feed pipe 12 is guided through the sludge feed pipe 7, which opens into the inlet chamber 10 and is provided in the end region with a nozzle-shaped outlet opening 13.
  • This flocculant feed pipe 12 is held in the sludge feed pipe 7 according to the invention both axially adjustable and rotatable.
  • a tubular extension piece 14 with a locking screw 15 arranged at the outer end of the sludge feed pipe 7 serves as a holder. By loosening the adjusting screw 15, the flocculant feed pipe 12 can be moved both in the axial direction and rotated about the axis.
  • the flocculant supply pipe 12 with the nozzle-shaped outlet opening 13 can be adjusted very advantageously in such a way that the flocculant jet 16 emerging from the nozzle-shaped outlet opening 13 under pressure strikes the rotating sludge layer located in the peripheral area within the sludge inlet chamber 10 and at least partially penetrates, with an intimate mixing of sludge and flocculant.
  • this area lies between the baffle 8 and the sludge passage openings 11, specifically at the point where the sludge in the peripheral region of the inlet chamber 10 is away from the baffle wall 8, approximately in the axial direction towards the sludge passage openings 11 emotional.
  • the amount of flocculant supplied to the sludge in the inlet chamber 10 via line 12, for example under a pressure of approximately 0.5 to 10 bar, can be optimally adjusted in this way, i.e. be adjusted to the amount of flocculant that is necessary to capture and flocculate all solid particles present in the sludge. In this way, the flocculant consumption can be reduced considerably in comparison to the previously known devices and the separation effect can be significantly improved.
  • the flocculant supply pipe 12 can consist of several parts 17 which are arranged to be pluggable or telescopically displaceable.
  • the flocculant feed pipe 12 can also be attached in the sludge feed pipe 7 centrally, laterally at the top in the axial direction, or also at an angle to it.
  • the flocculant feed pipe 12 can optionally also be introduced into the inlet chamber 10 outside the sludge feed pipe 12.
  • the flocculant supply pipe 12 according to the invention can also be very advantageously provided with a plurality of nozzle-shaped outlet openings.

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Description

Die Erfindung bezieht sich auf eine Vorrichtung zum Einbringen von Flockungsmitteln in den Schlamm innerhalb der Einlaufkammer einer Zentrifuge, bestehend aus einem Flockungsmittel-Zuführungsrohr, das durch das Schlamm- Zuführungsrohr hindurchgeführt ist und in die mit Schlamm-Durchtrittsöffnungen versehene Einlaufkammer der Zentrifuge hineinragt, wobei in der Einlaufkammer mit Abstand von der Mündung des Schlamm-Zuführungsrohres eine zur Mündung des Schlamm-Zuführungsrohres senkrecht verlaufende Prallwand angeordnet ist.The invention relates to a device for introducing flocculants into the sludge inside the inlet chamber of a centrifuge, consisting of a flocculant feed pipe which is passed through the sludge feed pipe and projects into the inlet chamber of the centrifuge provided with sludge through-openings, wherein in the inlet chamber at a distance from the mouth of the sludge feed pipe is arranged a baffle perpendicular to the mouth of the sludge feed pipe.

Aus der deutschen Offenlegungsschrift 28 22 533 ist eine Vollmanteldekantier-Zentrifuge obiger Bauart bekannt, bei der das Flockungsmittel über eine stationär angeordnete Leitung, die durch das Schlamm-Zuführungsrohr hindurchgeführt ist, in die Einlaufkammer im wesentlichen im Gleichstrom zum Schlamm der Zentrifuge drucklos zugeführt wird. Die Vermischung des Flockungsmittels mit dem Schlamm erfolgt hierbei allein durch die in der Einlaufkammer herrschenden Strömungsturbulenzen. Eine ausreichende innige Vermischung des Flockungsmittels mit dem Schlamm ist jedoch hierbei aufgrund der Gleichstromführung beider Medien auch dann nicht zu erreichen, wenn dem Schlamm erheblich mehr Flockungsmittel zugegeben werden, als für die Ausflockung der im Schlamm vorhandenen Feststoffpartikel erforderlich ist. Eine Überdosierung des Schlammes mit Flockungsmitteln ist jedoch mit erhöhten Kosten verbunden und daher unwirtschaftlich. Andererseits werden bei dieser bekannten Art der Flokkungsmittelzufuhr aufgrund der geringen Durchdringung und Vermischung mit dem Schlamm nicht alle im Schlamm befindlichen Feststoffpartikel von den Flockungsmitteln erreicht, was sich wiederum nachteilig auf die Trennung der Feststoffe von der Flüssigkeit in der Zentrifuge auswirkt.From German Offenlegungsschrift 28 22 533, a full jacket decanter centrifuge of the above type is known, in which the flocculant is fed without pressure into the inlet chamber essentially in direct current to the sludge of the centrifuge via a stationary line which is passed through the sludge feed pipe. The flocculant is mixed with the sludge solely through the flow turbulence in the inlet chamber. A sufficient intimate mixing of the flocculant with the sludge cannot be achieved due to the direct current flow of both media even if considerably more flocculant is added to the sludge than is necessary for the flocculation of the solid particles present in the sludge. Overdosing the sludge with flocculants is associated with increased costs and is therefore uneconomical. On the other hand, in this known type of flocculant supply, due to the low penetration and mixing with the sludge, not all of the solid particles in the sludge are reached by the flocculants, which in turn has a disadvantageous effect on the separation of the solids from the liquid in the centrifuge.

Ferner ist aus der DE-B-12 15 606 eine Vorrichtung zum Vermischen von Flockungsmitteln mit Schlämmen in Absetzzentrifugen bekannt, bei der das Flockungsmittel über ein im Schlamm-Einlaufrohr axial verstellbares Rohr auf den im Einlauftrichter in die Zentrifugentrommel einfließenden Schlamm etwa in radialer Richtung aufgebracht wird. Da jedoch hierbei der Schlamm über den Einlauftrichter im geradelinigen Verlauf ohne jegliche Umlenkung und Umwälzung direkt in das in der Zentrifuge befindliche Feststoff-Flüssigkeitsgemisch hineinfließt, ist insbesondere bei zähflüssigen dickeren Schlämmen auch bei einer hohen Überdosierung des Schlammes mit Flockungsmitteln eine innige und ausreichende Vermischung des Flockungsmittels mit dem Schlamm nicht zu erreichen.Furthermore, from DE-B-12 15 606 a device for mixing flocculants with sludges in settling centrifuges is known, in which the flocculant is applied via a pipe axially adjustable in the sludge inlet pipe to the sludge flowing into the centrifuge drum in the inlet funnel approximately in the radial direction becomes. However, since the sludge flows through the inlet funnel in a straight line without any deflection and circulation directly into the solid-liquid mixture in the centrifuge, an intimate and sufficient mixing of the flocculant is particularly necessary with viscous thick sludge even when the sludge is overdosed with flocculants not reachable with the mud.

Die Aufgabe der Erfindung besteht daher darin, eine Vorrichtung zum Einbringen von Flokkungsmitteln in den Schlamm innerhalb der Einlaufkammer einer Zentrifuge zu schaffen, die bei geringstmöglichem Flockungsmittelverbrauch eine optimale Vermischung des Flockungsmittels mit dem Schlamm ermöglicht.The object of the invention is therefore to provide a device for introducing flocculants into the sludge within the inlet chamber of a centrifuge, which enables the flocculant to be optimally mixed with the sludge while using as little flocculant as possible.

Diese Aufgabe wird dadurch gelöst, daß die Prallwand mit einem zentral auf die Mündung des Schlamm-Zuführungsrohres gerichteten Prallkegel versehen ist, und daß das Flockungsmittel-Zuführungsrohr im Schlamm-Zuführungsrohr axial verstellbar und/oder drehbeweglich so gehalten ist, daß seine Austrittsöffnung auf den Bereich zwischen der Prallwand und den mit Abstand davon angeordneten Schlamm-Durchtrittsöffnungen in der Einlaufkammer gerichtet ist.This object is achieved in that the baffle is provided with a baffle cone centrally directed onto the mouth of the sludge feed pipe, and in that the flocculant feed pipe in the sludge feed pipe is axially adjustable and / or rotatably held so that its outlet opening onto the area is directed between the baffle and the sludge passage openings arranged at a distance therefrom in the inlet chamber.

Dadurch, daß die Prallwand gemäß der Erfindung mit einem zentral auf die Mündung des Schlamm-Zuführungsrohres gerichteten Prallkegel versehen ist, wird sehr vorteilhaft in der Einlaufkammer eine allseitige gleichmäßige Verteilung des Schlammes erreicht, in den die Flokkungsmittel eingebracht und mit diesem ebenso gleichmäßig vermischt werden können. Dadurch, daß ferner gemäß der Erfindung das Flockungsmittel-Zuführungsrohr im Schlamm-Zuführungsrohr axial verstellbar und/oder drehbeweglich so gehalten ist, daß seine Austrittsöffnung auf den Bereich zwischen der Prallwand und den mit Abstand davon angeordneten Schlamm-Durchtrittsöffnungen in der Einlaufkammer gerichtet ist, kann sehr vorteilhaft der aus der düsenförmigen Austrittsöffnung des Flockungsmittel-Zuführungsrohres austretende Flockungsmittelstrahl genau auf den im peripheren Bereich der Einlaufkammer befindlichen Schlammfluß gerichtet bzw. eingestellt werden, in dem der Flockungsmittelstrahl tief in den Schlamm eindringt und sich dabei innig mit dem Schlamm vermischt. Dieser Bereich liegt, wie praktische Versuche gezeigt haben, zwischen der Prallwand der Einlaufkammer und den Schlamm-Durchtrittsöffnungen in der Kammer, und zwar dort, wo die Schlammströmung eine starke Umlenkung in entgegengesetzter Richtung zur Einlaufrichtung erfährt. Die in diesem Bereich bereits erfolgte innige Vermischung des Flockungsmittels mit dem Schlamm wird durch die unmittelbar daran anschließende, nochmalige starke Umlenkung und Umwälzung des Schlammes im Bereich der Durchtrittsöffnungen intensiviert. Auf diese Weise läßt sich sehr vorteilhaft die Flockungsmittelzugabe auf die jeweils erforderliche Mindestmenge reduzieren, wodurch im Vergleich zu den bisher bekannten Flockungsmittel-Zuführungsvorrichtungen eine Einsparung an Flokkungsmittel in manchen Fällen bis zu über 50% erzielt wird.Characterized in that the baffle wall according to the invention is provided with a baffle cone centrally directed onto the mouth of the sludge feed pipe, an all-round uniform distribution of the sludge is very advantageously achieved in the inlet chamber, into which the flocculants can be introduced and mixed with it also equally . Characterized in that, according to the invention, the flocculant feed pipe in the sludge feed pipe is axially adjustable and / or rotatably held so that its outlet opening is directed to the area between the baffle and the sludge passage openings arranged at a distance therefrom in the inlet chamber very advantageously the flocculant jet emerging from the nozzle-shaped outlet opening of the flocculant feed pipe is directed or adjusted precisely to the sludge flow located in the peripheral region of the inlet chamber, in which the flocculant jet penetrates deeply into the sludge and thereby mixes intimately with the sludge. As practical tests have shown, this area lies between the baffle wall of the inlet chamber and the sludge passage openings in the chamber, specifically where the sludge flow undergoes a strong deflection in the opposite direction to the inlet direction. The intimate mixing of the flocculant with the sludge that has already taken place in this area is intensified by the subsequent subsequent strong redirection and circulation of the sludge in the area of the passage openings. In this way, the flocculant addition can very advantageously be reduced to the minimum required in each case, as a result of which, in comparison with the previously known flocculant supply devices, savings in flocculants can be achieved in some cases of up to over 50%.

Gemäß einer weiteren vorteilhaften Ausgestaltung der Erfindung besteht das Flockungsmittel-Zuführungsohr aus mehreren Teilen, die zusammensteckbar oder teleskopartig ineinander verschiebbar angeordnet sind. Durch diese Ausgestaltung des Flockungsmittel-Zuführungsohres kann der Aus- und Einbau des Flockungsmittel-Zuführungsrohres bei geringem Platzbedarf in einfacher Weise vorgenommen werden.According to a further advantageous embodiment of the invention, the flocculant feed tube consists of several parts which are arranged to be pluggable or telescopically displaceable. This configuration of the flocculant feed tube makes it easy to remove and install the flocculant feed tube in a small space.

In weiterer Ausgestaltung der Erfindung besteht das Flockungsmittel-Zuführungsrohr aus einem flexiblen oder elastischem Werkstoff, insbesondere aus Gummi. Ein derartiges Flockungsmittel-Zuführungsrohr zeichnet sich besonders durch die leichte Handhabung beim Ein- und Ausbau sowie durch die Selbstabdichtung an der Durchführungsöffnung im Schlammzuführungsohr aus.In a further embodiment of the invention the flocculant supply pipe consists of a flexible or elastic material, in particular rubber. Such a flocculant feed pipe is particularly characterized by the easy handling during installation and removal and by the self-sealing at the through opening in the sludge feed pipe.

Die Vorrichtung gemäß der Erfindung wird nachfolgend anhand von in der Zeichnung schematisch dargestellten Ausführungsbeispielen näher erläutert.The device according to the invention is explained in more detail below with reference to exemplary embodiments schematically illustrated in the drawing.

Es zeigen:

  • Fig. 1 einen Teilausschnitt einer Vollmantel-Schneckenzentrifuge mit Einlaufkammer und Flockungsmittel-Zuführungsrohr gemäß der Erfindung;
  • Fig. 2 einen Teilausschnitt einer am Schlamm- zuführungsrohr angeordneten Halterung für das Flockungsmittel-Zuführungsrohr gemäß der Erfindung in vergrößertem Maßstab.
  • Fig. 3 einen Teilausschnitt eines aus mehreren Teilen bestehenden Flockungsmittel-Zuführungsrohres gemäß der Erfindung.
Show it:
  • Figure 1 is a partial section of a solid bowl screw centrifuge with inlet chamber and flocculant feed pipe according to the invention.
  • 2 shows a partial section of a holder for the flocculant feed pipe according to the invention arranged on the sludge feed pipe on an enlarged scale.
  • Fig. 3 is a partial section of a multi-part flocculant supply pipe according to the invention.

Wie Fig. 1 zeigt, besteht die Zentrifuge aus einer Zentrifugentrommel 1, in der koaxial eine Förderschnecke 2 angeordnet ist, deren Welle als Hohlwelle 3 ausgebildet und außen von der Schnekkenwendel 4 umgeben ist. Die Hohlwelle 3 ist durch eine Stirnwand 5 abgeschlossen, die im zentralen Bereich mit einer Öffnung 6 versehen ist, durch die ein stationär angeordnetes Schlammzuführungsrohr 7 hindurchgeführt ist. In der Hohlwelle 3 ist mit Abstand von der Stirnwandung 5 eine Prallwand 8 mit Prallkegel 9 eingebaut, die zusammen mit der Stirnwand 5 und der Hohlwelle 3 eine Einlaufkammer 10 für den Schlamm bildet. In der Hohlwelle 3 sind im Bereich dieser Einlaufkammer 10 mehrere über den Umfang gleichmäßig verteilte Öffnungen 11 für den Schlammdurchtritt in die Zentrifugentrommel 1 vorgesehen.As shown in FIG. 1, the centrifuge consists of a centrifuge drum 1, in which a screw conveyor 2 is arranged coaxially, the shaft of which is designed as a hollow shaft 3 and is externally surrounded by the screw spiral 4. The hollow shaft 3 is closed by an end wall 5, which is provided in the central region with an opening 6 through which a stationary arranged sludge feed pipe 7 is passed. A baffle 8 with baffle cone 9 is installed in the hollow shaft 3 at a distance from the end wall 5, which together with the end wall 5 and the hollow shaft 3 forms an inlet chamber 10 for the sludge. Provided in the hollow shaft 3 in the area of this inlet chamber 10 are a plurality of openings 11 evenly distributed over the circumference for the sludge to pass into the centrifuge drum 1.

Durch das Schlammzuführungsrohr 7, das in die Einlaufkammer 10 mündet, ist ein Flockungsmittel-Zuführungsrohr 12 hindurchgeführt, das im Endbereich mit einer düsenförmigen Austrittsöffnung 13 versehen ist. Dieses Flockungsmittel-Zuführungsrohr 12 ist im Schlammzuführungsrohr 7 gemäß der Erfindung sowohl axial verstellbar als auch drehbeweglich gehalten. Als Halterung dient hierzu ein am äußeren Ende des Schlammzuführungsrohres 7 angeordnetes rohrförmiges Verlängerungsstück 14 mit Feststellschraube 15. Durch Lockern der Stellschraube 15 kann das Flockungsmittel-Zuführungsrohr 12 sowohl in axialer Richtung verschoben als auch um die Achse verdreht werden. Auf diese Weise kann sehr vorteilhaft das Flockungsmittel-Zuführungsrohr 12 mit der düsenförmigen Austrittsöffnung 13 jeweils so verstellt werden, daß der aus der düsenförmigen Austrittsöffnung 13 unter Druck austretende Flockungsmittelstrahl 16 auf die im peripheren Bereich innerhalb der Schlammeinlaufkammer 10 befindliche rotierende Schlammschicht auftrifft und diese mindestens teilweise durchdringt, wobei eine innige Vermischung von Schlamm und Flockungsmittel erfolgt. Dieser Bereich liegt, wie durch praktische Versuche ermittelt wurde, zwischen der Prallwand 8 und den Schlammdurchtrittsöffnungen 11, und zwar an der Stelle, wo sich der Schlamm im peripheren Bereich der Einlaufkammer 10 von der Prallwand 8 weg, etwa in Achsrichtung zu den Schlammdurchtrittsöffnungen 11 hin bewegt. Die unter Druck von beispielsweise unter etwa 0,5 bis 10 bar über die Leitung 12 dem Schlamm in der Einlaufkammer 10 zugeführte Menge an Flokkungsmitteln, kann auf diese Weise optimal eingestellt werden, d.h. auf die Flockungsmittelmenge eingestellt werden, die nötig ist, um alle im Schlamm vorhandenen Feststoffpartikeln zu erfassen und auszuflocken. Der Flockungsmittelverbrauch kann auf diese Weise im Vergleich zu den bisher bekannten Vorrichtungen ganz erheblich reduziert und der Trenneffekt wesentlich verbessert werden.A flocculant feed pipe 12 is guided through the sludge feed pipe 7, which opens into the inlet chamber 10 and is provided in the end region with a nozzle-shaped outlet opening 13. This flocculant feed pipe 12 is held in the sludge feed pipe 7 according to the invention both axially adjustable and rotatable. A tubular extension piece 14 with a locking screw 15 arranged at the outer end of the sludge feed pipe 7 serves as a holder. By loosening the adjusting screw 15, the flocculant feed pipe 12 can be moved both in the axial direction and rotated about the axis. In this way, the flocculant supply pipe 12 with the nozzle-shaped outlet opening 13 can be adjusted very advantageously in such a way that the flocculant jet 16 emerging from the nozzle-shaped outlet opening 13 under pressure strikes the rotating sludge layer located in the peripheral area within the sludge inlet chamber 10 and at least partially penetrates, with an intimate mixing of sludge and flocculant. As has been determined by practical tests, this area lies between the baffle 8 and the sludge passage openings 11, specifically at the point where the sludge in the peripheral region of the inlet chamber 10 is away from the baffle wall 8, approximately in the axial direction towards the sludge passage openings 11 emotional. The amount of flocculant supplied to the sludge in the inlet chamber 10 via line 12, for example under a pressure of approximately 0.5 to 10 bar, can be optimally adjusted in this way, i.e. be adjusted to the amount of flocculant that is necessary to capture and flocculate all solid particles present in the sludge. In this way, the flocculant consumption can be reduced considerably in comparison to the previously known devices and the separation effect can be significantly improved.

Um den Aus- und Einbau des Flockungsmittel-Zuführungsrohres 12 in einfacher und besonders platzsparender Weise zu ermöglichen, kann, wie Fig. 2 zeigt, das Flockungsmittel-Zuführungsrohr 12 aus mehreren Teilen 17 bestehen, die zusammensteckbar oder teleskopartig ineinander verschiebbar angeordnet sind.In order to enable the removal and installation of the flocculant supply pipe 12 in a simple and particularly space-saving manner, as shown in FIG. 2, the flocculant supply pipe 12 can consist of several parts 17 which are arranged to be pluggable or telescopically displaceable.

Ferner kann das Flockungsmittel-Zuführungsrohr 12, wie beispielsweise die Fig. 3 zeigt, auch aus einem flexiblen oder einem elastischen Werkstoff, insbesondere aus Gummi, bestehen und durch eine entsprechende Öffnung 18 in einem am Schlammzuführungsrohr 7 angeordneten Verlängerungsstück 19 hindurchgeführt sein, wobei aufgrund der Elastizität des unter Druck stehenden Flockungsmittel-Zuführungsrohres 12 ein dichtes Anliegen und damit Festklemmen in der Öffnung 18 des Verlängerungsstückes in einfacher Weise erreicht wird. Eine besondere Feststellschraube ist bei dieser Ausbildung und konstruktiven Anordnung des Flockungsmittel-Zuführungsrohres 12 nicht erforderlich.3, can also consist of a flexible or an elastic material, in particular rubber, and can be passed through a corresponding opening 18 in an extension piece 19 arranged on the sludge feed pipe 7, whereby due to the Elasticity of the pressurized flocculant supply pipe 12, a tight fit and thus clamping in the opening 18 of the extension piece is achieved in a simple manner. A special locking screw is not required with this design and structural arrangement of the flocculant supply pipe 12.

Der Gegenstand der Erfindung ist nicht auf die in der Zeichnung dargestellten Ausführungsbeispiele beschränkt. So kann das Flockungsmittel-Zuführungsrohr 12 im Schlammzuführungsrohr 7 auch mittig, seitlich oben in Achsrichtung verlaufend, oder auch schräg dazu verlaufend angebracht sein. Auch kann das Flockungsmittel-Zuführungsrohr 12 gegebenenfalls außerhalb des Schlammzuführungsrohres 12 in die Einlaufkammer 10 eingeführt werden. Ferner kann das Flokkungsmittel-Zuführungsrohr 12 gemäß der Erfindung auch sehr vorteilhaft mit mehreren düsenförmigen Austrittsöffnungen versehen werden.The object of the invention is not limited to the exemplary embodiments shown in the drawing. For example, the flocculant feed pipe 12 can also be attached in the sludge feed pipe 7 centrally, laterally at the top in the axial direction, or also at an angle to it. The flocculant feed pipe 12 can optionally also be introduced into the inlet chamber 10 outside the sludge feed pipe 12. Furthermore, the flocculant supply pipe 12 according to the invention can also be very advantageously provided with a plurality of nozzle-shaped outlet openings.

Claims (3)

1. Device for introducing flocculants into the sludge inside the inlet chamber (10) of a centrifuge, consisting of a flocculant feed tube (12) which is passed through the sludge feed tube (7) and projects into the inlet chamber (10) of the centrifuge, said inlet chamber being provided with sludge passage openings (11) in which there is disposed in the inlet chamber (10) at a distance from the mouth of the sludge feed tube (7) a baffle plate (8) running at right angles to the mouth of the sludge feed tube (7), characterised in that the baffle plate (8) is provided with a baffle cone (9) directed centrally towards the mouth of the sludge feed tube (7), and that the flocculant feed tube (12) is held axially displaceable and/or rotatable in the sludge feed tube (7) so that its outlet opening (13) is directed towards the region between the baffle plate (8) and the sludge passage openings (11) disposed at a distance therefrom in the inlet chamber (10).
2. Device according to claim 1, characterised in that the flocculant feed tube (12) consists of several parts (17) which are capable of being assembled or inserted into one another telescopically.
3. Device according to claim 1 or 2, characterised in that the flocculant feed tube (12) consists of a flexible or elastic material, in particular rubber.
EP85112142A 1984-10-10 1985-09-25 Device for introducing flocculants into sludge inside the loading chamber of a centrifuge Expired - Lifetime EP0177838B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3437157 1984-10-10
DE3437157 1984-10-10
DE3444349 1984-12-05
DE19843444349 DE3444349A1 (en) 1984-10-10 1984-12-05 DEVICE FOR ADDING FLOCCULATORS INTO THE SLUDGE WITHIN THE INLET CHAMBER OF A CENTRIFUGE

Publications (3)

Publication Number Publication Date
EP0177838A2 EP0177838A2 (en) 1986-04-16
EP0177838A3 EP0177838A3 (en) 1987-10-28
EP0177838B1 true EP0177838B1 (en) 1990-05-09

Family

ID=25825520

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Application Number Title Priority Date Filing Date
EP85112142A Expired - Lifetime EP0177838B1 (en) 1984-10-10 1985-09-25 Device for introducing flocculants into sludge inside the loading chamber of a centrifuge

Country Status (3)

Country Link
EP (1) EP0177838B1 (en)
DE (2) DE3444349A1 (en)
FI (1) FI853805L (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK170967B1 (en) * 1990-03-13 1996-04-09 Alfa Laval Separation As decanter centrifuge
US5374234A (en) * 1990-03-13 1994-12-20 Alfa-Laval Separation A/S Decanter centrifuge with energy dissipating inlet
US6561965B1 (en) 2000-10-20 2003-05-13 Alfa Laval Inc. Mist pump for a decanter centrifuge feed chamber
DE102004057861A1 (en) * 2004-11-30 2006-06-01 Siebtechnik Gmbh Inlet pipe for a centrifuge, comprises an inner end which joins the delivery area of the rotating centrifuge, and a carrier section
CN110550712B (en) * 2019-08-27 2022-03-22 济南林源环保工程有限公司 Sewage treatment flocculating agent rapid mixing equipment

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1101301B (en) * 1957-08-23 1961-03-02 Krauss Maffei Ag Method and device for thickening sludge, in particular sewage sludge, which contains constituents that are difficult to sediment, by centrifugation using a flocculant
DE1215606B (en) * 1963-01-31 1966-04-28 Beteiligungs & Patentverw Gmbh Device for mixing flocculants with slurries in settling centrifuges
US3471081A (en) * 1967-12-21 1969-10-07 Ametek Inc Acid feed pipe
DE2260461C3 (en) * 1972-12-11 1980-06-04 Krauss-Maffei Ag, 8000 Muenchen Filter centrifuge
GB1602601A (en) * 1977-05-24 1981-11-11 Broadbent & Sons Ltd Thomas Solid bowl decanter centrifuges

Also Published As

Publication number Publication date
FI853805A0 (en) 1985-10-02
FI853805L (en) 1986-04-11
DE3444349A1 (en) 1986-04-10
EP0177838A3 (en) 1987-10-28
DE3577515D1 (en) 1990-06-13
EP0177838A2 (en) 1986-04-16

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