EP1712289B1 - Procédé de lavage de séparateur centrifugeuse pour la séparation de mélanges de deux phases liquides et de corps solides et non-solides - Google Patents

Procédé de lavage de séparateur centrifugeuse pour la séparation de mélanges de deux phases liquides et de corps solides et non-solides Download PDF

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Publication number
EP1712289B1
EP1712289B1 EP06425212A EP06425212A EP1712289B1 EP 1712289 B1 EP1712289 B1 EP 1712289B1 EP 06425212 A EP06425212 A EP 06425212A EP 06425212 A EP06425212 A EP 06425212A EP 1712289 B1 EP1712289 B1 EP 1712289B1
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EP
European Patent Office
Prior art keywords
drum
phase
washing
rotation axis
solid
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Application number
EP06425212A
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German (de)
English (en)
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EP1712289A1 (fr
EP1712289B2 (fr
Inventor
Gennaro Pieralisi
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Nuova Macchine Agricole Industriali Pieralisi MAIP SpA
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Nuova Macchine Agricole Industriali Pieralisi MAIP SpA
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B15/00—Other accessories for centrifuges
    • B04B15/06—Other accessories for centrifuges for cleaning bowls, filters, sieves, inserts, or the like

Definitions

  • the present patent application for industrial invention refers to a washing method for centrifugal separators, known as “disk centrifugal separators" for separation of mixtures composed of two liquid phases and solid and non-solid sediments according the pre-characterising portion of claim 1.
  • the said separators are normally used to separate mixtures composed of two liquids with different specific weight, which are respectively the "light phase” and the “heavy phase”; the heavy phase is sometimes the residual product obtained from processing with respect to the more valuable light phase.
  • a typical application of the said separators is found in oil industry, where the liquid to be separated, normally known as "oil wort", is centrifugated to extract the valuable oil component depurated from aqueous phase and solid sediments.
  • centrifugal separators with vertical axis which are basically composed of a feed conduit with vertical axis ending into a column distributor, being an integral part of a drum that rotates around the said conduit and supports a stack of diaphragms with spacers, consisting in a closed and overlapped series of lamellar disks with truncated-conical profile, which make separation of the two liquid phases easier, favouring the formation of a laminar flow through the spaces of the stack of diaphragms.
  • a preferably constant amount of mixture is dropped or introduced continuously in the feed conduit by means of a feed pump, goes through the distribution column and inundates the drum, including the area with lamellar disks.
  • the product continues phase separation while passing through the area with lamellar disks.
  • the heavy phase and the solid sediments migrate towards the peripheral area, sliding on the lower surface of the lamellar disks, and the light phase occupies the centre of the drum, sliding on the upper surface of the lamellar disk, thus forming three layers inside the rotating drum: one external layer made of solid sediments, one intermediate layer made of the heavy phase and one internal layer made of the light phase, being the three phases separated by two interfaces, theoretically composed of two vertical cylindrical surfaces coaxial with the drum.
  • the two liquid phases formed inside the drum are divided by a partition positioned on the opposite side with respect to the side where the product is introduced in the drum from the bottom of the distribution column and basically composed of a bell that rotates with the drum, whose peripheral border creates a reverse overflow with is overridden by the heavy phase directed towards the annular area formed by the bell.
  • the bell divides the drum in two sections, thus creating two communicating vessels: the heavy phase on one side, the heavy phase on the other side and the light phase inside.
  • the solid sediments stratify on the bottom of the vessels, which corresponds to the peripheral area of the drum.
  • the liquid phases can be extracted from the drum by means of annular openings, with straight and free overflow, separated and positioned on top of the drum in external position with respect to the feed conduit with vertical axis; more precisely, the heavy phase is extracted continuously through a first opening and the light phase is extracted continuously through a second opening situated at a lower distance from the drum rotation axis with respect to the first opening.
  • the two overflow openings are situated at two different radial levels to intercept the free surfaces of the two liquid phases that are positioned on completely different radial levels due to a more intense centrifugal field than the gravity field.
  • the drum is normally provided with peripheral openings with sub-radial direction that are normally closed and opened during the rotation of the drum in order to eject the solid sediments with the liquid mass inside the drum by centrifugation.
  • This structure of the drum is particularly used in applications where the product to be separated contains a considerable quantity of solid sediments; this version of the drum is defined as "automatic discharge" drum.
  • the drum When the drum is not provided with the said openings, the drum is defined as “manual discharge” drum, meaning that sediments can be only removed by stopping the separator and dismounting the drum.
  • the automatic discharge i.e. drum with openings
  • the automatic discharge is performed to restore the best operating conditions of the separator. Therefore, once sediments are ejected, periodical cleaning is required to remove all sediments (normally dirtying agents) that are not automatically discharged and are trapped in the small gaps of the drum and of the stack of lamellar disks.
  • the "automatic discharge" drum is periodically opened (at the end of working day or week, according to the dirtying characteristics of the product being processed) to clean each disk manually, as in the case of drums without openings.
  • This type of machine does not permit the washing procedure known as CIP (cleaning in place), which allows to wash the drum without dismounting it, while the machine is in operation, because the lamellar disks are not subjected to the washing flow.
  • CIP washing in place
  • the CIP of the drum is a complete cleaning operation of the drum, with special reference to the lamellar disks, performed introducing a washing liquid flow, possibly with added detergent, or an alkaline or acid solution into the feed conduit.
  • the mechanical washing action because of hydraulic turbulence is possibly associated with a chemical action based on the agents used.
  • the essential condition for CIP is that the washing flow goes through the lamellar pack; this condition, however, cannot be achieved if the overflow opening of the heavy phase, that is to say the furthest one from the drum axis, is open, thus creating a preferential exit for the washing liquid, which cannot raise to wash the lamellar disks.
  • Japanese patent No. JP03181348 A describes a method cleaning of the drum by switching a high-flow-rate cleaning in which a cleaning solution discharged from a water outlet is directly returned to a raw liquid inlet and a low-flow-rate cleaning in which the cleaning solution is circulated between a centrifugal separator and a cleaning solution tank.
  • the aforesaid method does not provide for the association of the openings used for the exit of the heavy and light phases with centripetal pumps, as described in the method according to the present invention.
  • the purpose of the present invention is to provide a solution to all aforementioned disadvantages, introducing a new effective washing method of CIP type.
  • washing is performed in two phases, regardless of their sequence, a first washing phase dedicated to clean the internal peripheral areas of the drum, where sediment and heavy phase are stratified, and a second washing phase dedicated to clean the central areas, and particularly the lamellar disks.
  • the washing phase dedicated to clean the internal peripheral areas of the drum is performed keeping both overflow openings open; evidently, the washing liquid flows off from the overflow opening situated at the furthest distance from the rotation axis of the drum.
  • the washing phase dedicated to clean the central areas of the drum is performed keeping the overflow opening situated at the furthest distance from the rotation axis of the drum closed and keeping the overflow opening situated at the closest distance from the rotation axis open, in such a way that the washing liquid is forced to go through the small spaces of the lamellar disks in centripetal direction and exit from the second overflow opening.
  • the washing method of the invention requires the introduction of means used to intercept the flow exiting the overflow opening situated at the furthest distance from the rotation axis of the drum while the machine is in operation.
  • Any interception means can be used, such as cocks, gates or obturating disks of the type used in some models of centrifugal separators to favour the correct emptying of the drum and recuperate the light phase contained in the drum, before the periodical removal of the sediments laid against the walls of the drum.
  • a centrifugal separator with vertical axis which is basically composed of a feed conduit with vertical axis ending into a column distributor, being an integral part of a drum that rotates around the said conduit and supports a stack of diaphragms with spacers, consisting in a closed and overlapped series of lamellar disks with truncated-conical profile, which make separation of the two liquid phases easier, favouring the formation of a laminar flow through the spaces of the stack of diaphragms.
  • a preferably constant amount of mixture is dropped or introduced continuously in the feed conduit by means of a feed pump, goes through the distribution column and inundates the drum, including the area with lamellar disks.
  • the product continues phase separation while passing through the area with lamellar disks.
  • the heavy phase and the solid sediments migrate towards the peripheral area, sliding on the lower surface of the lamellar disks, and the light phase occupies the centre of the drum, sliding on the upper surface of the lamellar disk, thus forming three layers inside the rotating drum: one external layer made of solid sediments, one intermediate layer made of the heavy phase and one internal layer made of the light phase, being the three phases separated by two interfaces, theoretically composed of two vertical cylindrical surfaces coaxial with the drum.
  • the two liquid phases formed inside the drum are divided by a partition positioned on the opposite side with respect to the side where the product is introduced in the drum from the bottom of the distribution column and basically composed of a bell that rotates with the drum, whose peripheral border creates a reverse overflow with is overridden by the heavy phase directed towards the annular area formed by the bell.
  • the bell divides the drum in two sections, thus creating two communicating vessels: the heavy phase on one side, the heavy phase on the other side and the light phase inside.
  • the solid sediments stratify on the bottom of the vessels, which corresponds to the peripheral area of the drum.
  • the liquid phases can be extracted from the drum by means of annular openings, with straight and free overflow, separated and positioned on top of the drum in external position with respect to the feed conduit with vertical axis; more precisely, the heavy phase is extracted continuously through a first opening and the light phase is extracted continuously through a second opening situated at a lower distance from the drum rotation axis with respect to the first opening.
  • the two overflow openings are situated at two different radial levels to intercept the free surfaces of the two liquid phases that are positioned on completely different radial levels due to a more intense centrifugal field than the gravity field.
  • the drum is provided with peripheral openings with sub-radial direction that are normally closed and opened during the rotation of the drum in order to eject the solid sediments with the liquid mass inside the drum by centrifugation.
  • This structure of the drum is particularly used in applications where the product to be separated contains a considerable quantity of solid sediments; this version of the drum is defined as "automatic discharge" drum.
  • the valuable liquid phase Before performing the automatic ejection or manual removal of sediments, the valuable liquid phase must be extracted from the drum, in order not to waste it.
  • the automatic discharge i.e. drum with openings
  • the automatic discharge is performed to restore the best operating conditions of the separator. Therefore, once sediments are ejected, periodical cleaning is required to remove all sediments (normally dirtying agents) that are not automatically discharged and are trapped in the small gaps of the drum and of the stack of lamellar disks.
  • CIP cleaning in place
  • the mechanical washing action because of hydraulic turbulence is possibly associated with a chemical action based on the agents used.
  • the essential condition for CIP is that the washing flow goes through the lamellar pack; this condition is achieved by the washing method according to the invention by a second washing phase dedicated to clean the internal central areas of the drum, and specifically the stack of lamellar disks, in which the first overflow opening situated at the furthest distance from the rotation axis of the drum is kept closed with ordinary interception means and the second overflow opening situated at the closest distance from the rotation axis of the drum is kept open, in such a way that the washing liquid flow is forced to go through the small spaces of the lamellar disks in centripetal direction and exit from the second overflow opening situated at the closest distance from the rotation axis of the drum.

Landscapes

  • Centrifugal Separators (AREA)

Claims (3)

  1. Méthode de lavage pour appareils centrifuges pour la séparation de mélanges de deux phases liquides, ayant un poids spécifique différent, et de sédiments solides et non, du type comprenant un tambour rotatif, contenant une pile de disques lamellaires (ou scourtins) de séparation des dites phases liquides, l'une ainsi dite "lourde", l'autre ainsi dite "légère", qui peuvent être extraites en continu à travers une première et une seconde ouverture à débordement, étant respectivement la première et la seconde ouverture positionnées plus loin et plus près par rapport à l'axe de rotation du tambour, cette méthode comprenant au moins un premier stade de lavage dédié au nettoyage interne du tambour, en correspondance de ses zones les plus périphériques, lavage pendant lequel les deux dites ouvertures à débordement sont maintenues ouvertes ; cette méthode est caractérisée par un second stade de lavage dédié au nettoyage interne du tambour en correspondance de ses zones les plus centrales et, dans notre cas spécifiquement, dans la dite pile de disques lamellaires (ou scourtins), lavage pendant lequel la première ouverture à débordement, c'est-à-dire celle la plus éloignée de l'axe de rotation du tambour, est maintenue fermée par le biais de moyens d'obturation connus, tandis que le seconde ouverture à débordement, c'est-à-dire celle la plus proche de l'axe de rotation du tambour, est maintenue ouverte, de manière à ce que tout le liquide de lavage soit contraint de traverser, en direction centripète, tous les interstices de la dite pile de disques, pour ensuite sortir de la dite seconde ouverture à débordement, c'est-à-dire celle la plus proche de l'axe de rotation du tambour.
  2. Méthode selon la revendication 1), caractérisée en ce qu'elle prévoit que les dits moyens d'obturations sont amenés en position fermée pendant la rotation du tambour.
  3. Méthode de lavage selon la revendication 1) ou 2), caractérisée en ce que pendant le stade de lavage dont au poste b) de la première revendication, la fermeture de l'ouverture à débordement positionnée le plus loin de l'axe de rotation du tambour s'effectue par le biais du disque obturateur déjà présent et utilisé sur certains modèles de séparateurs centrifuges du type connu, afin de favoriser le vidage correct du tambour, avec la récupération de toute la phase ainsi dite légère contenue dans le tambour même, avant de procéder à la phase de "déchargement manuel" ou à la phase de "déchargement automatique" des sédiments qui se sont accumulés dans le tambour.
EP06425212A 2005-04-14 2006-03-29 Procédé de lavage de séparateur centrifugeuse pour la séparation de mélanges de deux phases liquides et de corps solides et non-solides Active EP1712289B2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000031A ITMC20050031A1 (it) 2005-04-14 2005-04-14 Metodo di lavaggio per apparecchi centrifughi per la separazione di miscele composte da due fasi liquide e da sedimenti solidi e non.

Publications (3)

Publication Number Publication Date
EP1712289A1 EP1712289A1 (fr) 2006-10-18
EP1712289B1 true EP1712289B1 (fr) 2008-01-16
EP1712289B2 EP1712289B2 (fr) 2012-11-14

Family

ID=36649112

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Application Number Title Priority Date Filing Date
EP06425212A Active EP1712289B2 (fr) 2005-04-14 2006-03-29 Procédé de lavage de séparateur centrifugeuse pour la séparation de mélanges de deux phases liquides et de corps solides et non-solides

Country Status (7)

Country Link
EP (1) EP1712289B2 (fr)
AR (1) AR055903A1 (fr)
AT (1) ATE383908T1 (fr)
AU (1) AU2006201400B2 (fr)
DE (1) DE602006000441T2 (fr)
ES (1) ES2300097T5 (fr)
IT (1) ITMC20050031A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITAN20120088A1 (it) 2012-07-12 2014-01-13 Pieralisi Maip Societa Per Azioni Separatore centrifugo o decanter provvisto di sistema di chiusura perfezionato.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1749291A (en) † 1927-10-26 1930-03-04 Laval Separator Co De Centrifugal separator
DE3722169C2 (de) 1987-07-04 1997-06-05 Thomson Brandt Gmbh Verfahren und Vorrichtung zur Durchführung des Verfahrens zur Anpassung eines Mehrbetriebsarten-Monitors an einen Personal Computer
SE459234B (sv) † 1987-10-15 1989-06-19 Alfa Laval Marine Power Eng Saett och utrustning foer invaendig diskning av en centrifugrotor
JPH03181348A (ja) * 1989-12-12 1991-08-07 Kyoto Kikai Kk 分離板型遠心分離機の洗浄方法
JP3181348B2 (ja) 1992-02-05 2001-07-03 バブコック日立株式会社 スプレードライヤ装置およびこれを用いた排液処理方法
US5735789A (en) * 1992-06-16 1998-04-07 Alfa Laval Separation Ab Centrifugal separator

Also Published As

Publication number Publication date
EP1712289A1 (fr) 2006-10-18
AU2006201400A1 (en) 2006-11-02
ES2300097T5 (es) 2013-03-22
ES2300097T3 (es) 2008-06-01
DE602006000441T2 (de) 2008-11-27
AR055903A1 (es) 2007-09-12
ATE383908T1 (de) 2008-02-15
EP1712289B2 (fr) 2012-11-14
DE602006000441D1 (de) 2008-03-06
ITMC20050031A1 (it) 2006-10-15
AU2006201400B2 (en) 2010-04-29

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