EP1594598B1 - Device for stirring a liquid and injecting a gas into said liquid with limited clogging - Google Patents

Device for stirring a liquid and injecting a gas into said liquid with limited clogging Download PDF

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Publication number
EP1594598B1
EP1594598B1 EP03799707A EP03799707A EP1594598B1 EP 1594598 B1 EP1594598 B1 EP 1594598B1 EP 03799707 A EP03799707 A EP 03799707A EP 03799707 A EP03799707 A EP 03799707A EP 1594598 B1 EP1594598 B1 EP 1594598B1
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EP
European Patent Office
Prior art keywords
turbine
liquid
gas
impeller
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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EP03799707A
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German (de)
French (fr)
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EP1594598A1 (en
Inventor
Stéphane Melen
Martine Poux
Catherine Xuereb
Rodolphe Sardeing
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Institut National Polytechnique de Toulouse INPT
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
Original Assignee
Institut National Polytechnique de Toulouse INPT
Air Liquide SA
LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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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
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
    • B01F27/192—Stirrers with two or more mixing elements mounted in sequence on the same axis with dissimilar elements
    • 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
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2334—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements provided with stationary guiding means surrounding at least partially the stirrer
    • B01F23/23342—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements provided with stationary guiding means surrounding at least partially the stirrer the stirrer being of the centrifugal type, e.g. with a surrounding stator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/111—Centrifugal stirrers, i.e. stirrers with radial outlets; Stirrers of the turbine type, e.g. with means to guide the flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/113—Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller

Definitions

  • the present invention relates to a device for stirring a liquid in a reactor and injecting a gas into the liquid, using a self-suction turbine.
  • the document EP-A1-0 995 485 discloses a device for stirring a liquid in a reactor and injecting a gas into the liquid according to the preamble of claim 1.
  • This device comprises a drive motor of a vertical shaft disposed above the reactor.
  • the motor shaft carries and drives at its lower end a propeller immersed in the liquid; it also carries and drives a self-suction turbine placed between the surface of the liquid and the propeller.
  • the self-suction turbine is connected to a source of gas, generally an oxygenated gas, so that when it is driven by the motor shaft, it sucks both gas and liquid in which it is immersed thus forming a gas-liquid dispersion.
  • the gas-liquid dispersion generated by the self-suction turbine is directed towards the propeller by means of an annular baffle box which envelops the self-suction turbine.
  • the object of the present invention is to provide a device of this type according to claim 1 wherein the suction capacity of the gas in the turbine is increased.
  • the invention relates to a device for stirring a liquid and injecting a gas into the liquid as defined above, in which the surface of the lower disk of the self-suction turbine is lower than on the surface of the upper disk of said turbine.
  • reactor means "basin” natural and “reservoir” walls more or less close and more or less closed sky.
  • FIGS. 1A and 1B make it possible to characterize the device according to the prior art and which is improved by the present invention.
  • the device according to the invention comprises a drive device (1), for example a motor, arranged above the surface of the liquid, provided with a rotary output shaft (2) extending vertically and partially immersed in the liquid.
  • the shaft (2) carries at its lower end (3) a mobile axial flow, preferably a propeller (4), immersed in the liquid.
  • the shaft (2) also carries, arranged between the impeller (4) and the surface of the liquid, a self-suction turbine (5) which is consequently immersed in the reactor and is driven by the output shaft (2) at the same speed as the propeller (4).
  • the output shaft (2) is coaxially wrapped by a cylinder (6) connected at its upper end to the driving device (1), with the interposition of a sealing device (7), and whose lower end (6a) opens into the turbine (5) coaxially with the shaft (2).
  • a cylinder (6) connected at its upper end to the driving device (1), with the interposition of a sealing device (7), and whose lower end (6a) opens into the turbine (5) coaxially with the shaft (2).
  • an opening (14) for injecting a gas into the annular gap (15) delimited by the shaft (2) and by the cylinder (6).
  • the gas injection system in the orifice (14) is not shown.
  • the self-suction turbine (5) consists of two horizontally placed discs (8, 9) and a set of radial blades (11) placed between the discs (8, 9) and fixed thereto.
  • the essential characteristic of the invention lies in the nature of the self-suction turbine used. According to the invention, the surface of the lower disk (9) of the self-suction turbine (5) must be smaller than the surface of the upper disk (9) of said turbine. This characteristic can be obtained by the implementation of different types of turbine.
  • the lower disk (9) of the self-suction turbine (5) may have a smaller diameter than the diameter of the upper disk (8).
  • the diameter of the lower disk (9) is at least greater than or equal to the diameter of the at least partially annular space (13) through which the liquid is sucked into the turbine. This type of turbine is illustrated in FIG.
  • the lower disk (8) is at least partially hollowed out.
  • hollow out is meant to remove a part of the disk.
  • the lower disk (8) can be, for example, at least partially hollowed out in the form of a ring, that is to say that a ring shape is removed from the lower disk.
  • This type of turbine is illustrated in FIG. 3. It is also possible to use a turbine in which the entire center of the lower disk has been removed, except for an outer ring. In the latter case, the lower disk is composed only of a metal crown. It is also possible to use a turbine in which at least one angular sector has been removed, preferably several angular sectors distributed symmetrically.
  • the output shaft (2) passes axially through the disks (8, 9) of the turbine (5) and is fixed to the lower disk (9), so that when the drive device (1) is actuated, the shaft (2) drives the turbine (5) and the axial flow mobile (4) in rotation at the same speed.
  • the rotation of the turbine (5) creates the suction of the gas arriving through the orifice (14), via the cylinder (6), as well as the suction of a part of the liquid which is introduced by the annular gap (13) left free between the turbine (5) and the cylinder (6).
  • the device according to the invention comprises means for directing towards the propeller (4) the gas-liquid dispersion expelled radially by the turbine (5) between its blades (11).
  • these means may comprise an annular casing (16) forming a deflector, enveloping the turbine (5) and profiled in order to direct towards the mobile axial flow (4) a stream radially from the turbine, pierced with two openings central superimposed (17, 18) coaxial with the shaft (2).
  • the diameter of the lower opening (18) is greater than the diameter of the upper opening (17) and substantially equal to the diameter of the upper disc of the self-suction turbine (5).
  • the means for directing towards the propeller (4) the gas-liquid dispersion can also comprise a set of plates (19) substantially vertical, forming counter-blades, arranged radially around the baffle box (16) and fixed thereto .
  • each counter-blade (19) penetrates radially inside the baffle box (16), to which it is fixed by appropriate means, for example welding or riveting.
  • the counter-blades (19) can be arranged around the self-suction turbine (5) and the helix (4) in appropriate number at defined angular intervals.
  • a notch (21) in which may penetrate the ends of the blades of the propeller (4).
  • a device according to the invention makes it possible to push back the limit of clogging of a device of the same type according to the prior art.
  • a device according to the invention operates normally and will inject the gas into the liquid and stir the liquid, under conditions where the device according to the prior art is clogged.
  • An advantage of the device according to the invention is that with identical powers, the device according to the invention makes it possible to increase the flow rate of gas injected into the liquid with respect to the device according to the prior art. This increase is at least 30%.
  • the device according to the invention has a simplified operation compared to the device of the prior art.
  • no additional agitation mobile is placed on the output shaft below the self-suction turbine, unlike the optimized version of the device according to the prior art.
  • a first turbine series tested corresponds to the implementation of the first variant of the invention (surface of the lower disk of the turbine lower than the surface of the upper disk of the turbine).
  • the characteristics of these different turbines according to the first variant are defined in Table 1 below.
  • Table 1 Turbine Diameter of the upper disk Lower disc diameter Turbine 0 (prior art) 80 mm 80 mm Turbine 1 80 mm 0 Turbine 2 80 mm 50 mm Turbine 3 80 mm 60 mm
  • Turbine 4 has discs of diameter 80 mm and in its lower disc, was removed a ring 5 mm wide from a distance of 25 mm from the center of the disc.
  • the gas engorgement of the stirring devices according to FIG. 1 equipped by the different turbines 1 to 4 was compared with the clogging of the device according to the prior art equipped with the turbine 0 and an additional agitation device. placed on the output shaft below the turbine 0.
  • the gas flow rate in the device was increased while keeping the speed of the constant drive device.
  • the gas used is air at a pressure of 2 bar absolute. The detection of the clogging is done visually by observation, on the one hand, of the stop of the dispersion of the gas in the reactor and, on the other hand, of the evacuation of the gas by the liquid admission means in the turbine (annular space 13).
  • the curve of FIG. 4 represents for each device of FIG. 1 equipped with turbines 0, 1, 2, 3 and 4 the gas flow rates (Q in l / h) observed at the waterlogging for different values of rotation speed ( N in min -1 ). It is noted that at identical speed, the clogging of the devices implementing the turbines 1 to 4 is obtained for much higher gas flow rates than for the device using the turbine 0.
  • the depressions generated by each of these turbines in the cylinder (6) surrounding the shaft (2) and in which the gas circulates were also calculated.
  • the depressions were characterized by the measurement of the number of Euler and are collected in Table 2.
  • the number of Euler translates the capacity of the device to induce the gas in the turbine: the higher it is, the more the turbine creates a depression important in the cylinder (6).
  • Table 2 Turbine Number of Euler Eu Turbine 0 (prior art) 4.71 Turbine 1 1.30 Turbine 2 3.14 Turbine 3 3.97 Turbine 4 4.09
  • the device according to the invention equipped with Turbine 1 makes it possible to push back the waterlogging limit significantly, it has a low Euler number and thus a low gas induction capacity.
  • the devices according to the invention equipped with Turbines 2 to 4 have a satisfactory Euler number while pushing back the clogging limits of the device according to the prior art (Turbine 0).

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Accessories For Mixers (AREA)
  • Gas Separation By Absorption (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • Nozzles (AREA)

Abstract

The surface of a lower disk of a turbine is lower than the surface of an upper disk. The lower disk has a smaller diameter than the upper disk and a diameter which is greater than or equal to the diameter of an annular space. A device for agitating a liquid in a reactor and injection of a gas into a liquid has a driving device above a receiver, with a vertical output axle with at least one movable device with axis flow immersed in the liquid, and a self-drawing turbine immersed in the reactor which can be driven by the output shaft. The output shaft is enclosed by a coaxial cylinder the lower end of which opens in the turbine and the upper end of which is connected in a sealed manner to the driving device. The cylinder is pierced with a hole for injecting gas in an annular space between the shaft and the cylinder. The turbine is made of two superimposed disks and an assembly of radial blades placed between the disks and fixed to them. The upper disk is pierced with a central hole into which fits the bottom end of the cylinder to describe an annular space between the cylinder and the edge of the hole by which liquid is drawn into the turbine. The gas-liquid dispersion expelled radially by the turbine is directed towards the axial flow device. The lower disk is at least partly hollow in the form of a ring. The axial flow moving device is a helix. An annular casing forms a deflector to send the gas- liquid dispersion ejected radially by the turbine to the axial flow moving device, pierced with two opposing central holes coaxial with the shaft. No additional agitator is placed on the output shaft below the axial flow device.

Description

La présente invention concerne un dispositif d'agitation d'un liquide dans un réacteur et d'injection d'un gaz dans ce liquide, mettant en oeuvre une turbine auto-aspirante.The present invention relates to a device for stirring a liquid in a reactor and injecting a gas into the liquid, using a self-suction turbine.

Le document EP-A1-0 995 485 décrit un dispositif d'agitation d'un liquide dans un réacteur et d'injection d'un gaz dans ce liquide selon le préamble de la revendication 1. Ce dispositif comprend un moteur d'entraînement d'un arbre vertical disposé au-dessus du réacteur. L'arbre du moteur porte et entraîne à son extrémité inférieure une hélice immergée dans le liquide ; il porte et entraîne également une turbine auto-aspirante placée entre la surface du liquide et l'hélice. La turbine auto-aspirante est connectée à une source de gaz, généralement un gaz oxygéné, de manière à ce que lorsqu'elle est entraînée par l'arbre du moteur, elle aspire à la fois du gaz et du liquide dans lequel elle est immergée, formant ainsi une dispersion gaz-liquide. La dispersion gaz-liquide générée par la turbine auto-aspirante est dirigée vers l'hélice à l'aide d'un caisson annulaire formant déflecteur qui enveloppe la turbine auto-aspirante.The document EP-A1-0 995 485 discloses a device for stirring a liquid in a reactor and injecting a gas into the liquid according to the preamble of claim 1. This device comprises a drive motor of a vertical shaft disposed above the reactor. The motor shaft carries and drives at its lower end a propeller immersed in the liquid; it also carries and drives a self-suction turbine placed between the surface of the liquid and the propeller. The self-suction turbine is connected to a source of gas, generally an oxygenated gas, so that when it is driven by the motor shaft, it sucks both gas and liquid in which it is immersed thus forming a gas-liquid dispersion. The gas-liquid dispersion generated by the self-suction turbine is directed towards the propeller by means of an annular baffle box which envelops the self-suction turbine.

On a pu constater que, dans certaines conditions d'utilisation de ce type de dispositif de l'art antérieur, la capacité d'aspiration du gaz dans la turbine était limitée du fait de l'engorgement en gaz du volume défini par la turbine et le caisson annulaire. Ainsi, l'évacuation du mélange gaz-liquide hors du caisson annulaire se fait difficilement : d'une part, il y a absence de dispersion du gaz dans le réacteur, d'autre part, le gaz présent sous le caisson annulaire tente de s'échapper par les moyens d'admission du liquide dans la turbine, ce qui conduit à une absence de transfert du gaz dans le liquide et à un gaspillage du gaz qui remonte à la surface sans être utilisé.It has been found that, under certain conditions of use of this type of device of the prior art, the suction capacity of the gas in the turbine was limited because of the gas clogging of the volume defined by the turbine and the annular caisson. Thus, the evacuation of the gas-liquid mixture from the annular chamber is difficult: firstly, there is no dispersion of the gas in the reactor, secondly, the gas present under the annular chamber attempts to escape through the liquid inlet means in the turbine, which leads to a lack of transfer of gas into the liquid and a waste of gas that rises to the surface without being used.

Le but de la présente invention est de proposer un dispositif de ce type selon la revendication 1 dans lequel la capacité d'aspiration du gaz dans la turbine est augmentée.The object of the present invention is to provide a device of this type according to claim 1 wherein the suction capacity of the gas in the turbine is increased.

Dans ce but, l'invention concerne un dispositif d'agitation d'un liquide et d'injection d'un gaz dans ce liquide tel que défini ci-dessus, dans lequel la surface du disque inférieur de la turbine auto-aspirante est inférieure à la surface du disque supérieur de ladite turbine.For this purpose, the invention relates to a device for stirring a liquid and injecting a gas into the liquid as defined above, in which the surface of the lower disk of the self-suction turbine is lower than on the surface of the upper disk of said turbine.

D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description qui va suivre. Des formes et des modes de réalisation de l'invention sont donnés à titre d'exemples non limitatifs, illustrés par les dessins joints dans lesquels :

  • les figures 1A et 1B sont des vues schématiques d'un dispositif selon l'art antérieur,
  • les figures 2 et 3 sont des vues schématiques de turbines auto-aspirantes utilisables dans le dispositif selon l'invention,
  • la figure 4 représente les courbes de limite d'engorgement de différents dispositifs selon l'invention et selon l'art antérieur.
Other characteristics and advantages of the invention will appear on reading the description which follows. Embodiments and embodiments of the invention are given by way of non-limiting examples, illustrated by the accompanying drawings in which:
  • FIGS. 1A and 1B are schematic views of a device according to the prior art,
  • FIGS. 2 and 3 are schematic views of self-aspirating turbines that can be used in the device according to the invention,
  • FIG. 4 represents the congestion limit curves of various devices according to the invention and according to the prior art.

Dans ce qui suit, le terme « réacteur » signifie « bassin » naturel ainsi que « réservoir » à parois plus ou moins proches et à ciel plus ou moins fermé.In what follows, the term "reactor" means "basin" natural and "reservoir" walls more or less close and more or less closed sky.

L'invention concerne donc un dispositif d'agitation d'un liquide et d'injection d'un gaz dans ledit liquide, comprenant :

  • un dispositif d'entraînement disposé au-dessus du liquide, pourvu d'un arbre de sortie vertical équipé :
    • . à son extrémité inférieure d'au moins un mobile à flux axial immergé dans le liquide, et
    • . d'une turbine immergée dans le réacteur et entraînée par l'arbre de sortie,
    l'arbre de sortie étant enveloppé coaxialement par un cylindre dont l'extrémité inférieure débouche dans la turbine auto-aspirante et dont l'extrémité supérieure est liée de manière étanche au dispositif d'entraînement et est percée d'une ouverture d'injection d'un gaz dans un intervalle annulaire délimité par l'arbre et le cylindre,
    la turbine étant constituée de deux disques superposés et d'un ensemble d'aubes radiales disposées entre les disques et fixées à ceux-ci, le disque supérieur étant percé d'un trou central dans lequel pénètre l'extrémité inférieure du cylindre qui délimité avec le bord dudit trou un espace au moins partiellement annulaire par lequel du liquide est aspiré dans la turbine,
  • des moyens pour diriger vers le mobile à flux axial la dispersion gaz-liquide expulsée radialement par la turbine,
et dans lequel la surface du disque inférieur de la turbine auto-aspirante est inférieure à la surface du disque supérieur de ladite turbine.The invention therefore relates to a device for agitating a liquid and injecting a gas into said liquid, comprising:
  • a drive device disposed above the liquid, provided with a vertical output shaft equipped with:
    • . at its lower end at least one axial flow mobile immersed in the liquid, and
    • . a turbine immersed in the reactor and driven by the output shaft,
    the output shaft being coaxially wrapped by a cylinder whose lower end opens into the self-suction turbine and whose upper end is sealingly connected to the drive device and is pierced with an injection opening of a gas in an annular gap delimited by the shaft and the cylinder,
    the turbine consisting of two superimposed disks and a set of radial vanes arranged between the disks and fixed thereto, the upper disk being pierced with a central hole into which the lower end of the cylinder which delimited with the edge of said hole an at least partially annular space through which liquid is sucked into the turbine,
  • means for directing towards the axial-flow mobile the gas-liquid dispersion expelled radially by the turbine,
and wherein the surface of the lower disk of the self-suction turbine is smaller than the surface of the upper disk of said turbine.

Les figures 1A et 1 B permettent de caractériser le dispositif selon l'art antérieur et qui est amélioré par la présente invention. Le dispositif selon l'invention comprend un dispositif d'entraînement (1), par exemple un moteur, disposé au-dessus de la surface du liquide, pourvu d'un arbre rotatif de sortie (2) s'étendant verticalement et partiellement immergé dans le liquide. L'arbre (2) porte à son extrémité inférieure (3) un mobile à flux axial, de préférence une hélice (4), immergé dans le liquide. L'arbre (2) porte également, disposée entre l'hélice (4) et la surface du liquide, une turbine auto-aspirante (5) qui est par conséquent immergée dans le réacteur et est entraînée par l'arbre de sortie (2) à la même vitesse que l'hélice (4). L'arbre de sortie (2) est enveloppé coaxialement par un cylindre (6) lié à son extrémité supérieure au dispositif d'entraînement (1), avec interposition d'un dispositif d'étanchéité (7), et dont l'extrémité inférieure (6a) débouche dans la turbine (5) coaxialement à l'arbre (2). Dans l'extrémité supérieure du cylindre (6) est percée une ouverture (14) d'injection d'un gaz dans l'intervalle annulaire (15) délimité par l'arbre (2) et par le cylindre (6). Le système d'injection de gaz dans l'orifice (14) n'est pas représenté.FIGS. 1A and 1B make it possible to characterize the device according to the prior art and which is improved by the present invention. The device according to the invention comprises a drive device (1), for example a motor, arranged above the surface of the liquid, provided with a rotary output shaft (2) extending vertically and partially immersed in the liquid. The shaft (2) carries at its lower end (3) a mobile axial flow, preferably a propeller (4), immersed in the liquid. The shaft (2) also carries, arranged between the impeller (4) and the surface of the liquid, a self-suction turbine (5) which is consequently immersed in the reactor and is driven by the output shaft (2) at the same speed as the propeller (4). The output shaft (2) is coaxially wrapped by a cylinder (6) connected at its upper end to the driving device (1), with the interposition of a sealing device (7), and whose lower end (6a) opens into the turbine (5) coaxially with the shaft (2). In the upper end of the cylinder (6) is pierced an opening (14) for injecting a gas into the annular gap (15) delimited by the shaft (2) and by the cylinder (6). The gas injection system in the orifice (14) is not shown.

La turbine auto-aspirante (5) est constituée de deux disques (8, 9) placés horizontalement, et d'un ensemble d'aubes radiales (11), placées entre les disques (8, 9) et fixées à ceux-ci. La caractéristique essentielle de l'invention tient à la nature de la turbine auto-aspirante mise en oeuvre. Selon l'invention, la surface du disque inférieur (9) de la turbine auto-aspirante (5) doit être inférieure à la surface du disque supérieur (9) de ladite turbine. Cette caractéristique peut être obtenue par la mise en oeuvre de différents types de turbine.The self-suction turbine (5) consists of two horizontally placed discs (8, 9) and a set of radial blades (11) placed between the discs (8, 9) and fixed thereto. The essential characteristic of the invention lies in the nature of the self-suction turbine used. According to the invention, the surface of the lower disk (9) of the self-suction turbine (5) must be smaller than the surface of the upper disk (9) of said turbine. This characteristic can be obtained by the implementation of different types of turbine.

Selon une première variante du dispositif selon l'invention, le disque inférieur (9) de la turbine auto-aspirante (5) peut présenter un diamètre inférieur au diamètre du disque supérieur (8). De préférence, le diamètre du disque inférieur (9) est au moins supérieur ou égal au diamètre de l'espace au moins partiellement annulaire (13) par lequel le liquide est aspiré dans la turbine. Ce type de turbine est illustré par la figure 2.According to a first variant of the device according to the invention, the lower disk (9) of the self-suction turbine (5) may have a smaller diameter than the diameter of the upper disk (8). Preferably, the diameter of the lower disk (9) is at least greater than or equal to the diameter of the at least partially annular space (13) through which the liquid is sucked into the turbine. This type of turbine is illustrated in FIG.

Selon une deuxième variante du dispositif selon l'invention, le disque inférieur (8) est au moins partiellement évidé. Par "évider", on entend le fait d'ôter une partie du disque. Le disque inférieur (8) peut être, par exemple, au moins partiellement évidé sous la forme d'un anneau, c'est-à-dire qu'une forme d'anneau est ôtée du disque inférieur. Ce type de turbine est illustré par la figure 3. On peut également utiliser une turbine dans laquelle on a ôté tout le centre du disque inférieur sauf une couronne extérieure. Dans ce dernier cas, le disque inférieur n'est plus composé que d'une couronne de métal. On peut aussi utiliser une turbine dans laquelle on a ôté au moins un secteur angulaire, de préférence plusieurs secteurs angulaires répartis symétriquement.According to a second variant of the device according to the invention, the lower disk (8) is at least partially hollowed out. By "hollow out" is meant to remove a part of the disk. The lower disk (8) can be, for example, at least partially hollowed out in the form of a ring, that is to say that a ring shape is removed from the lower disk. This type of turbine is illustrated in FIG. 3. It is also possible to use a turbine in which the entire center of the lower disk has been removed, except for an outer ring. In the latter case, the lower disk is composed only of a metal crown. It is also possible to use a turbine in which at least one angular sector has been removed, preferably several angular sectors distributed symmetrically.

Enfin, il est possible de combiner ces différentes variantes et d'utiliser des turbines dont le disque inférieur est partiellement évidé en combinant différentes formes d'évidement tel qu'un évidement par anneau et un évidement par secteur. Ainsi, on peut utiliser une turbine dont des secteurs angulaires d'anneaux sont évidés.Finally, it is possible to combine these different variants and to use turbines whose lower disk is partially hollowed out by combining different forms of recess such as a ring recess and a recess by sector. Thus, it is possible to use a turbine whose angular sectors of rings are hollowed out.

L'arbre de sortie (2) traverse axialement les disques (8, 9) de la turbine (5) en étant fixé au disque inférieur (9), de sorte que lorsque le dispositif d'entraînement (1) est actionné, l'arbre (2) entraîne la turbine (5) et le mobile à flux axial (4) en rotation à la même vitesse. La rotation de la turbine (5) crée l'aspiration du gaz arrivant par l'orifice (14), par l'intermédiaire du cylindre (6), ainsi que l'aspiration d'une partie du liquide qui s'introduit par l'intervalle annulaire (13) laissé libre entre la turbine (5) et le cylindre (6).The output shaft (2) passes axially through the disks (8, 9) of the turbine (5) and is fixed to the lower disk (9), so that when the drive device (1) is actuated, the shaft (2) drives the turbine (5) and the axial flow mobile (4) in rotation at the same speed. The rotation of the turbine (5) creates the suction of the gas arriving through the orifice (14), via the cylinder (6), as well as the suction of a part of the liquid which is introduced by the annular gap (13) left free between the turbine (5) and the cylinder (6).

Le dispositif selon l'invention comprend des moyens pour diriger vers l'hélice (4) la dispersion gaz-liquide expulsée radialement par la turbine (5) entre ses aubes (11). Selon le mode préféré, ces moyens peuvent comprendre un caisson annulaire (16) formant déflecteur, enveloppant la turbine (5) et profilé afin de diriger vers le mobile à flux axial (4) un flux issu radialement de la turbine, percé de deux ouvertures centrales superposées (17, 18) coaxiales à l'arbre (2). De préférence, le diamètre de l'ouverture inférieure (18) est supérieur au diamètre de l'ouverture supérieure (17) et sensiblement égal au diamètre du disque supérieur de la turbine auto-aspirante (5). Les moyens pour diriger vers l'hélice (4) la dispersion gaz-liquide peut également comprendre un ensemble de plaques (19) sensiblement verticales, formant des contre-pâles, disposées radialement autour du caisson déflecteur (16) et fixées à celui-ci. A cet effet, chaque contre-pâle (19) pénètre radialement à l'intérieur du caisson déflecteur (16), auquel elle est fixée par des moyens appropriés, par exemple soudure ou rivetage. Les contre-pâles (19) peuvent être disposées autour de la turbine auto-aspirante (5) et de l'hélice (4) en nombre approprié à des intervalles angulaires déterminés. Dans le bord intérieur de chaque contre-pâle (19) est ménagée, au niveau de l'hélice (4), une entaille (21) dans laquelle peuvent pénétrer des extrémités des pâles de l'hélice (4).The device according to the invention comprises means for directing towards the propeller (4) the gas-liquid dispersion expelled radially by the turbine (5) between its blades (11). According to the preferred embodiment, these means may comprise an annular casing (16) forming a deflector, enveloping the turbine (5) and profiled in order to direct towards the mobile axial flow (4) a stream radially from the turbine, pierced with two openings central superimposed (17, 18) coaxial with the shaft (2). Preferably, the diameter of the lower opening (18) is greater than the diameter of the upper opening (17) and substantially equal to the diameter of the upper disc of the self-suction turbine (5). The means for directing towards the propeller (4) the gas-liquid dispersion can also comprise a set of plates (19) substantially vertical, forming counter-blades, arranged radially around the baffle box (16) and fixed thereto . For this purpose, each counter-blade (19) penetrates radially inside the baffle box (16), to which it is fixed by appropriate means, for example welding or riveting. The counter-blades (19) can be arranged around the self-suction turbine (5) and the helix (4) in appropriate number at defined angular intervals. In the inner edge of each counter-blade (19) is formed, at the helix (4), a notch (21) in which may penetrate the ends of the blades of the propeller (4).

Un dispositif selon l'invention permet de repousser la limite d'engorgement d'un appareil de même type selon l'art antérieur. Ainsi, un dispositif selon l'invention fonctionne normalement et permettra d'injecter le gaz dans le liquide et d'agiter le liquide, dans des conditions où le dispositif selon l'art antérieur est lui engorgé.A device according to the invention makes it possible to push back the limit of clogging of a device of the same type according to the prior art. Thus, a device according to the invention operates normally and will inject the gas into the liquid and stir the liquid, under conditions where the device according to the prior art is clogged.

Un avantage du dispositif selon l'invention est qu'à puissances identiques, le dispositif selon l'invention permet d'augmenter le débit de gaz injecté dans le liquide par rapport au dispositif selon fart antérieur. Cette augmentation est d'au moins 30 %.An advantage of the device according to the invention is that with identical powers, the device according to the invention makes it possible to increase the flow rate of gas injected into the liquid with respect to the device according to the prior art. This increase is at least 30%.

Un autre avantage est que le dispositif selon l'invention présente un fonctionnement simplifié par rapport au dispositif de l'art antérieur. Ainsi, aucun mobile d'agitation additionnel n'est placé sur l'arbre de sortie en dessous de la turbine auto-aspirante, contrairement à la version optimisée du dispositif selon l'art antérieur.Another advantage is that the device according to the invention has a simplified operation compared to the device of the prior art. Thus, no additional agitation mobile is placed on the output shaft below the self-suction turbine, unlike the optimized version of the device according to the prior art.

Exemples de mise en oeuvre du dispositifExamples of implementation of the device

Des dispositifs tels que décrits sur la figure 1 ont été équipés de différents types de turbine auto-aspirantes.Devices as described in Figure 1 have been equipped with different types of self-aspirating turbine.

Une première série de turbine testée correspond à la mise en oeuvre de la première variante de l'invention (surface du disque inférieur de la turbine inférieur à la surface du disque supérieur de la turbine). Les caractéristiques de ces différentes turbines selon la première variante sont définies dans le tableau 1 ci-dessous. Tableau 1 Turbine Diamètre du disque supérieur Diamètre du disque inférieur Turbine 0 (art antérieur) 80 mm 80 mm Turbine 1 80 mm 0 Turbine 2 80 mm 50 mm Turbine 3 80 mm 60 mm A first turbine series tested corresponds to the implementation of the first variant of the invention (surface of the lower disk of the turbine lower than the surface of the upper disk of the turbine). The characteristics of these different turbines according to the first variant are defined in Table 1 below. Table 1 Turbine Diameter of the upper disk Lower disc diameter Turbine 0 (prior art) 80 mm 80 mm Turbine 1 80 mm 0 Turbine 2 80 mm 50 mm Turbine 3 80 mm 60 mm

D'autres tests ont été réalisés avec une turbine correspondant à la mise en oeuvre de la deuxième variante de l'invention (diamètre des deux disques identiques et disque inférieur de la turbine partiellement évidé). La turbine testée, dénommée Turbine 4, présente des disques de diamètre 80 mm et dans son disque inférieur, on a ôté un anneau de 5 mm de large à partir d'une distance de 25 mm du centre du disque.Other tests were carried out with a turbine corresponding to the implementation of the second variant of the invention (diameter of the two identical discs and lower disc of the partially hollowed turbine). The turbine tested, called Turbine 4, has discs of diameter 80 mm and in its lower disc, was removed a ring 5 mm wide from a distance of 25 mm from the center of the disc.

L'engorgement en gaz des dispositifs d'agitation selon la figure 1 équipés par les différentes turbines 1 à 4 a été comparé à l'engorgement du dispositif selon l'art antérieur équipé de la turbine 0 et d'un mobile d'agitation additionnel placé sur l'arbre de sortie en dessous de la turbine 0. Afin de détecter l'engorgement, le débit de gaz dans le dispositif a été augmenté tout en conservant la vitesse du dispositif d'entraînement constante. Le gaz employé est de l'air à une pression de 2 bars absolus. La détection de l'engorgement se fait visuellement par observation, d'une part, de l'arrêt de la dispersion du gaz dans le réacteur et, d'autre par, de l'évacuation du gaz par les moyens d'admission du liquide dans la turbine (espace annulaire 13).The gas engorgement of the stirring devices according to FIG. 1 equipped by the different turbines 1 to 4 was compared with the clogging of the device according to the prior art equipped with the turbine 0 and an additional agitation device. placed on the output shaft below the turbine 0. In order to detect clogging, the gas flow rate in the device was increased while keeping the speed of the constant drive device. The gas used is air at a pressure of 2 bar absolute. The detection of the clogging is done visually by observation, on the one hand, of the stop of the dispersion of the gas in the reactor and, on the other hand, of the evacuation of the gas by the liquid admission means in the turbine (annular space 13).

La courbe de la figure 4 représente pour chaque dispositif de la figure 1 équipé des turbines 0, 1, 2, 3 et 4 les débits de gaz (Q en l/h) observés à l'engorgement pour différentes valeurs de vitesse de rotation (N en min-1). On constate qu'à vitesse identique, l'engorgement des dispositifs mettant en oeuvre les turbines 1 à 4 est obtenu pour des débits de gaz bien plus élevés que pour le dispositif mettant en oeuvre la turbine 0.The curve of FIG. 4 represents for each device of FIG. 1 equipped with turbines 0, 1, 2, 3 and 4 the gas flow rates (Q in l / h) observed at the waterlogging for different values of rotation speed ( N in min -1 ). It is noted that at identical speed, the clogging of the devices implementing the turbines 1 to 4 is obtained for much higher gas flow rates than for the device using the turbine 0.

Par simulation numérique, on a également calculé les dépressions générées par chacune de ces turbines dans le cylindre (6) entourant l'arbre (2) et dans lequel circule le gaz. Les dépressions ont été caractérisées par la mesure du nombre d'Euler et sont rassemblées dans le tableau 2. Le nombre d'Euler traduit la capacité du dispositif à induire le gaz dans la turbine : plus il est élevé, plus la turbine crée une dépression importante dans le cylindre (6). Le nombre d'Euler est calculé de la manière suivante : Eu = ΔP/(ρL(ND)2) où : ΔP est la dépression générée par la turbine dans le cylindre (6) exprimée en Pa, D est le diamètre définis par les pâles de la turbine exprimé en m, N est la vitesse de rotation de la turbine exprimé en s-1, et ρL est la masse volumique du liquide exprimé en kg/m3. D a une valeur de 80 mm pour toutes les turbines testées. Tableau 2 Turbine Nombre d'Euler Eu Turbine 0 (art antérieur) 4,71 Turbine 1 1,30 Turbine 2 3,14 Turbine 3 3,97 Turbine 4 4,09 By numerical simulation, the depressions generated by each of these turbines in the cylinder (6) surrounding the shaft (2) and in which the gas circulates were also calculated. The depressions were characterized by the measurement of the number of Euler and are collected in Table 2. The number of Euler translates the capacity of the device to induce the gas in the turbine: the higher it is, the more the turbine creates a depression important in the cylinder (6). The number of Euler is calculated in the following way: Eu = ΔP / (ρ L (ND) 2 ) where: ΔP is the depression generated by the turbine in the cylinder (6) expressed in Pa, D is the diameter defined by the blades of the turbine expressed in m, N is the rotational speed of the turbine expressed in s -1 , and ρ L is the density of the liquid expressed in kg / m 3 . D has a value of 80 mm for all turbines tested. Table 2 Turbine Number of Euler Eu Turbine 0 (prior art) 4.71 Turbine 1 1.30 Turbine 2 3.14 Turbine 3 3.97 Turbine 4 4.09

On observe que, bien que le dispositif selon l'invention équipé de la Turbine 1 permette de repousser la limite d'engorgement de manière importante, il présente un nombre d'Euler faible et donc une capacité d'induction du gaz faible. Les dispositifs selon l'invention équipés des Turbines 2 à 4 présentent un nombre d'Euler satisfaisant tout en repoussant les limites d'engorgement du dispositif selon l'art antérieur (Turbine 0).It is observed that, although the device according to the invention equipped with Turbine 1 makes it possible to push back the waterlogging limit significantly, it has a low Euler number and thus a low gas induction capacity. The devices according to the invention equipped with Turbines 2 to 4 have a satisfactory Euler number while pushing back the clogging limits of the device according to the prior art (Turbine 0).

Claims (8)

  1. Device for stirring a liquid in a reactor and for injecting a gas into a liquid, comprising:
    - a drive device (1) arranged above the container, provided
    - with a vertical output shaft (2) equipped at its lower end with at least one axial-flow moving assembly (4) submerged in the liquid, and
    - with a self-priming impeller (5) submerged in the reactor and being able to be driven by the output shaft (2),
    the output shaft being enveloped coaxially by a cylinder (6) whose lower end (6a) opens into the impeller and whose upper end is connected in a sealed manner to the drive device (1) and is perforated with an opening (14) for injecting a gas into an annular gap (15) delimited by the shaft and the cylinder,
    the impeller being composed of two superposed disks (8, 9) and of a set of radial vanes (11) arranged between the disks and fixed thereto, the upper disk (8) being perforated with a central hole (12) into which enters the lower end (6a) of the cylinder (6) which delimits, together with the edge of said hole, an at least partially annular space (13) through which liquid is sucked into the impeller,
    - means for directing toward the axial-flow moving assembly (4) the gas/liquid dispersion expelled radially by the impeller (5),
    characterized in that the surface area of the lower disk (9) of the self-priming impeller (5) is less than the surface area of the upper disk (8) of said impeller.
  2. Device according to Claim 1, characterized in that the lower disk (9) of the self-priming impeller (5) has a diameter which is less than the diameter of the upper disk (8).
  3. Device according to Claim 2, characterized in that the diameter of the lower disk (9) is at least greater than or equal to the diameter of the at least partially annular space (13).
  4. Device according to one of Claims 1 to 3, characterized in that the lower disk (8) is at least partially cut out.
  5. Device according to Claim 4, characterized in that the lower disk (8) is at least partially cut out in the form of an annulus.
  6. Device according to one of the preceding claims, characterized in that the axial-flow moving assembly (4) is a propeller.
  7. Device according to one of the preceding claims, characterized in that the means for directing toward the axial-flow moving assembly (4) the gas/liquid dispersion expelled radially by the impeller (5) comprise a baffle-forming annular casing (16) enveloping the impeller (5) and profiled so as to direct toward the axial-flow moving assembly (4) a stream issuing radially from the impeller, said annular casing being perforated with two superposed central openings (17, 18) coaxial with the shaft (2).
  8. Device according to one of the preceding claims, characterized in that no additional moving stirring assembly is placed on the output shaft below the axial-flow moving assembly (4).
EP03799707A 2002-12-12 2003-12-04 Device for stirring a liquid and injecting a gas into said liquid with limited clogging Expired - Lifetime EP1594598B1 (en)

Applications Claiming Priority (3)

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FR0215733 2002-12-12
FR0215733A FR2848472B1 (en) 2002-12-12 2002-12-12 DEVICE FOR STIMULATING A LIQUID AND INJECTING A GAS IN THIS LIQUID WITH LIMITED ENGAGEMENT
PCT/FR2003/050151 WO2004054694A1 (en) 2002-12-12 2003-12-04 Device for stirring a liquid and injecting a gas into said liquid with limited clogging

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CN102861548B (en) * 2010-09-20 2014-01-15 浙江诚信医化设备有限公司 Stirring type reacting kettle
CN102527312B (en) * 2010-12-29 2013-09-04 万华化学集团股份有限公司 Fast mixing reactor and application thereof
CN102614794B (en) * 2012-03-25 2015-01-07 浙江长城减速机有限公司 Tooth disc turbine diversion stirrer
CN104307455B (en) * 2014-10-28 2015-12-09 成都冠禹科技有限公司 A kind of industrial reaction still being applicable to chemical industry and medical feed liquid
JP6537318B2 (en) * 2015-03-30 2019-07-03 株式会社住化分析センター Gas-liquid processing system
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AU2003299411B2 (en) 2009-01-29
ES2295689T3 (en) 2008-04-16
ATE376875T1 (en) 2007-11-15
AU2003299411A1 (en) 2004-07-09
JP2006509625A (en) 2006-03-23
CN1729045A (en) 2006-02-01
CA2508429C (en) 2011-05-10
PT1594598E (en) 2008-01-24
FR2848472A1 (en) 2004-06-18
US20060151897A1 (en) 2006-07-13
US7431272B2 (en) 2008-10-07
DE60317241T2 (en) 2008-08-14
WO2004054694A1 (en) 2004-07-01
FR2848472B1 (en) 2005-02-18
DK1594598T3 (en) 2008-02-11
EP1594598A1 (en) 2005-11-16
BR0317264A (en) 2006-01-17
CA2508429A1 (en) 2004-07-01
JP4373336B2 (en) 2009-11-25
BR0317264B1 (en) 2010-11-30
DE60317241D1 (en) 2007-12-13

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