WO2006005828A1 - Device for hydraulic mixture of a coagulant into a main liquid stream - Google Patents

Device for hydraulic mixture of a coagulant into a main liquid stream Download PDF

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Publication number
WO2006005828A1
WO2006005828A1 PCT/FR2005/001255 FR2005001255W WO2006005828A1 WO 2006005828 A1 WO2006005828 A1 WO 2006005828A1 FR 2005001255 W FR2005001255 W FR 2005001255W WO 2006005828 A1 WO2006005828 A1 WO 2006005828A1
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WO
WIPO (PCT)
Prior art keywords
coagulant
nozzle
injection device
pipe
injection
Prior art date
Application number
PCT/FR2005/001255
Other languages
French (fr)
Inventor
Valérie GUIMET
Original Assignee
Suez Environnement
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Suez Environnement filed Critical Suez Environnement
Publication of WO2006005828A1 publication Critical patent/WO2006005828A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
    • B01F25/25—Mixing by jets impinging against collision plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3142—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit the conduit having a plurality of openings in the axial direction or in the circumferential direction

Definitions

  • the invention relates to a device for hydraulic mixing of a coagulant in a main stream of liquid, inside a pipe.
  • a coagulant is a chemical reactor which is injected and mixed in a liquid of low viscosity with high Reynolds number, such as raw water, so that colloids and aggregates suspended in the liquid are destabilized and form floc.
  • the chemical reaction that governs the coagulation principle is complete before the coagulant precipitates.
  • a hydraulic coagulant mixing device must allow both the dispersion of the coagulant inside the pipe, and the time required for the chemical reaction.
  • Such a liquid auxiliary jet mixer is well suited to high diameter pipes, especially pipes of diameter greater than 2 m (two meters).
  • the injection of the auxiliary jet generally of pressurized water, can be done at a current or countercurrent of the main flow.
  • the liquid auxiliary jet can be obtained by pumping a fraction of the main stream liquid, especially raw water or downstream filtered water, to create a rapid stream of water causing the dispersion of the coagulant.
  • the coagulant should be injected rapidly, near the pressurized water stream, into the raw water line to prevent pre-coagulation.
  • coagulants of metal origin react very rapidly with water and can, under certain pH conditions, precipitate before being dispersed.
  • the coagulant injection systems may thus clog the coagulant which precipitates. Other risks of clogging coagulant injection systems are created by the debris present in the driving water, especially if this water is not filtered.
  • the object of the invention is, above all, to provide a hydraulic mixing device of the kind defined above which, while making it possible to ensure good homogeneity in the distribution of the coagulating reagent, makes it possible to avoid or reduce the frequency of blockages or obstructions. various means of introducing the coagulant into the auxiliary jet of liquid under pressure. It is further desirable that the hydraulic mixing device remains of simple and economical construction.
  • a device for hydraulic mixing of coagulant in a main stream of liquid, inside a pipe comprises:
  • baffle means placed in the pipe against which the auxiliary jet is directed, the baffle means providing a transverse, essentially radial, deflection of the auxiliary jet
  • a means for introducing the coagulant into the auxiliary jet of liquid under pressure is characterized in that the means for introducing the coagulant is disposed outside the nozzle in the vicinity of the outlet in order to inject the coagulant in the auxiliary jet following substantially the same overall direction as the auxiliary jet, towards the deflector means.
  • the coagulant introduction means is disposed around the outlet of the injection nozzle to perform an annular injection of the coagulant into the auxiliary jet of liquid under pressure.
  • the injection nozzle has an outlet orifice circular and the means for introducing the coagulant has an annular contour concentric with the outlet nozzle.
  • the injection nozzle may have a frustoconical shape of revolution whose small base constitutes the outlet orifice, and the introduction means comprises a frustoconical envelope surrounding the nozzle and determining an annular chamber.
  • the arrival of liquid coagulant under pressure in the annular chamber surrounding the nozzle may be provided by a radially oriented pipe.
  • Partitions are advantageously provided between the outer surface of the nozzle and the envelope, in particular for fixing the latter.
  • the partitions can be located in radial planes passing through the axis of the nozzle to guide the coagulant injection in the direction of the auxiliary jet.
  • the partitions may be inclined relative to the axis at an angle favorable to the rotation of the coagulant jet and the creation of turbulence.
  • the deflector means has a surface of revolution whose meridian is formed by two concave curve arcs turning their concavity towards the exit of the nozzle and joining at one end at a point located on the axis of the nozzle, the arcs, at their other end, being substantially tangent to a plane orthogonal to said axis.
  • the annular chamber for injecting the coagulant faces the concave arches of the deflector.
  • a baffle may be provided in the pipe downstream of the baffle.
  • the baffle may comprise an annular wall orthogonal to the axis of the pipe and protruding from the inner wall of the pipe.
  • the axial distance ( ⁇ ) between the baffle and the deflector can be about 1.3 m.
  • Fig.l is a partial schematic vertical section illustrating the installation of a hydraulic mixing device according to the invention in a buried pipe.
  • Fig.2 is a vertical section on a larger scale of the device hydraulic mixing of Fig.l.
  • Fig.3 is a diagram in vertical section, on a smaller scale than Fig.2, illustrating the spatial evolution of the coagulant after injection.
  • Fig.4 is a perspective view of three-quarters front of the mixing device.
  • Fig.5 is a top view of the mixing device.
  • FIG. 6 is a schematic vertical section, on a small scale, of a variant with a chicane
  • Fig.7 is a diagram illustrating the coagulant dispersion behind the baffle of Fig.6.
  • a buried pipe C cylindrical of revolution having a high internal diameter D, that is to say greater than 2 m (two meters), geometric axis X-X.
  • a hydraulic mixing device 1 of a coagulant 2 (FIG. 3) in the main flow of raw water is placed along the axis of the pipe C.
  • a vertical well is provided. 3, communicating with the interior of the pipe C and opening above the surface of the ground S.
  • a vertical upright 4 is fixed in the well 3. This amount 4 allows the maintenance of a rod (not visible) vertical for the raw water supply under pressure of an injection nozzle 5 of the device 1.
  • the nozzle 5 (FIG. 2) has a truncated conical shape of revolution towards the outlet 6 delimited by a cylindrical wall.
  • the nozzle 5 is located at the end of the horizontal branch 7 of a bend 8 at right angles whose other end is provided with a flange 9 for sealing connection to the vertical rod (not visible) of supply of raw water under pressure.
  • the geometric axis of the part 7 and the nozzle 5 is horizontal coincident with the axis X-X of the pipe C, while the collar 9 is in a horizontal plane above the nozzle 5.
  • This nozzle 5 makes it possible to inject an auxiliary jet of liquid under pressure into the main stream, substantially parallel to the flow direction F.
  • a deflector 10 is placed in the pipe.
  • the outgoing stream of the nozzle 5 is directed against the deflector 10.
  • This deflector has a surface of revolution whose axis coincides with that of the nozzle 5.
  • the meridian of this surface of revolution is formed by two concave curve arcs 10a, 10b rotating their concavity towards the nozzle and joining at one end in a point 11 located on the axis of the nozzle 5 substantially at the outlet of the nozzle.
  • the arcs 10a, 10b, in particular formed by quarter circles, at their end remote from the tip 11 are substantially tangent to a plane orthogonal to the axis XX.
  • the deflector 10 is fixed on a vertical plate 12 of a support 13 held, relative to the nozzle 5, by a set of horizontal threaded rods 14 and nuts 15.
  • the rods 14, at their end remote from the plate 12, are engaged and held in holes of a collar 16 orthogonal to the axis of the nozzle 5 and fixed around the cylindrical portion 7.
  • a means 17 for introducing the coagulant, in liquid form or in solution, is disposed at outside the nozzle 5 in the vicinity of the outlet to perform an injection of the coagulant into the auxiliary jet of liquid under pressure, in substantially the same overall direction as that of the auxiliary jet, to the deflector means 10.
  • the means of introduction 17 is advantageously arranged around the outlet 6 of the nozzle 5 to perform an annular injection of the coagulant.
  • the introduction means 17 has an annular contour 18 (FIG. 4) concentric with the outlet nozzle.
  • the introduction means 17 comprises a frustoconical envelope 19 of coaxial revolution and parallel to the nozzle 5.
  • the large base of the envelope 19 is fixed on the collar 16, the small base of the envelope 19 is in the plane of leaving the orifice 6. Because the outlet 6 is delimited by a cylindrical wall, the radial dimension of the space or annular chamber 20 between the casing 9 and the nozzle 5 decreases to the outlet at the level of Part 6. This reduction in section causes an increase in the exit rate of the coagulant favorable to rapid mixing.
  • the arrival of liquid coagulant under pressure in the frustoconical annular chamber 20 is provided by a pipe 21 (FIG. 4) oriented tangentially to the large base of the casing 19.
  • the end of the pipe 21 remote from the casing 19 is provided with a connection flange 22.
  • Partitions 23 are provided between the outer surface of the nozzle 5 and the inner surface of the envelope 19.
  • the partitions 23 are distributed angularly at regular intervals. Their number can be equal to eight.
  • the partitions 23 start substantially at mid-length of the annular space 20, at a distance from the flange 16 and extend up to the exit end of the annular space.
  • partitions 23 have a mechanical function of holding, for example by welding, the casing 19 relative to the nozzle 5, and a hydraulic role to direct the outlet jet of the coagulant.
  • Each partition 23 may be situated in a radial plane passing through the geometric axis of the nozzle 5 so as to orientate at its outlet the coagulant jet (which is introduced tangentially through the pipe 21) in an overall direction close to that of the mainstream.
  • the partitions 23 may be inclined, for example 45 °, relative to the geometric axis of the nozzle 5 to cause turbulence output.
  • the annular chamber 20 opens out facing the concave surface of the arcs 10a, 10b of the deflector.
  • the arrival under pressure of the coagulant liquid or in solution is provided by a pipe G (Fig.l) connected to the pipe 21.
  • the auxiliary stream of pressurized raw water is injected through the nozzle 5 substantially parallel to the direction of the main stream in the pipe C.
  • the auxiliary jet radiates radially into a sheet 24 along the entire section of the pipe C.
  • the coagulant injected around the auxiliary jet, blooms along a layer 25 upstream of the sheet 24 and mixes almost instantaneously with the raw water of the main stream in the pipe C.
  • the rapid mixing of the coagulant increases the effectiveness of the treatment and reduces the amounts of coagulant used, thus reducing expenses.
  • the thin layer of coagulant is entrained by the web 24 of raw water.
  • the mixing of the coagulant with the water of the main stream is carried out practically without prior dilution of the coagulant.
  • the mixing time of the coagulant with the raw water of the current principal is less than 2 s (two seconds) and can be of the order of 0.1 s.
  • the speed of the current in the auxiliary jet delivered by the nozzle 5 is advantageously 20 m / s, but lower speeds, in particular of the order of 13 m / s remain acceptable while resulting in a lower efficiency.
  • the injection device according to the invention makes it possible to reduce the coagulant consumption by an average value estimated at 10%, which results in a significant saving because of the large volume of raw water treated in the pipes of large diameter.
  • a partitioning system 26 (FIG. an annular type baffle 27 for the cylindrical channel C.
  • the baffle 27 In the case of a channel open to the open air, of rectangular section, the baffle 27 would be rectangular.
  • the wall of the baffle 27 is orthogonal to the geometric axis of the pipe and is fixed against the inner surface of this pipe.
  • the baffle 27 determines a concentric passage opening 28 of diameter smaller than that of the main pipe.
  • the positioning of the baffle 27 along the main axis of the flow is preferably located in the vicinity of the point of inflection of the coagulant dispersion.
  • the distance ⁇ between the coagulant injection point (outlet of the nozzle 5) and the baffle 27 is equal to 1.3 m.
  • the radial dimension of the annular baffle is 50 cm so that the internal diameter of the pipe is reduced to 2.2 m at the narrowing 28 created by the baffle.
  • the dispersion efficiency for a driving speed at the outlet of the nozzle 5 of 13 m / s increases from 90% to a range of between 95 and 98%.
  • the arrows in dashed lines 29 schematize the blooming of the coagulant under the effect of the deflector.
  • the arrows converging towards the axis 30 schematize the upstream effect of the baffle 27 on the upstream fluid streams.
  • Arrows 31 schematize the flow of fluid downstream of the baffle.
  • Fig. 7 the fluid and coagulant streams are diagrammed. It appears that the coagulant layer is widely dispersed radially immediately downstream of the baffle 27, which promotes dispersion and mixing of coagulant.
  • the direction of the auxiliary jet of liquid under pressure delivered by the nozzle 5 is the same as that of the main stream, which corresponds to a co-current type operation.
  • a reverse arrangement would be possible with injection of the auxiliary jet in the opposite direction, that is to say, against -courant of the main flow according to the arrows F.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)

Abstract

The invention concerns a device for hydraulic mixture (1) of a coagulant into a main liquid stream, inside a pipe, comprising a nozzle (5) for injecting an auxiliary liquid jet under pressure into the main stream; deflecting means (10) located in the pipe, against which is directed the auxiliary jet, the deflecting means providing a substantially radial transverse deflection of the auxiliary jet; means for introducing (17) the coagulant into the auxiliary jet. The means for introducing (17) the coagulant is arranged outside the nozzle (5) proximate the output (6) to achieve an injection of coagulant into the auxiliary jet substantially along the same general direction as the auxiliary jet, towards the deflecting means (10).

Description

DISPOSITIF DE MELANGE HYDRAULIQUE D'UN COAGULANT DANS UN COURANT PRINCIPAL DE LIQUIDE.DEVICE FOR HYDRAULIC MIXING OF A COAGULANT IN A MAIN CURRENT OF LIQUID.
L'invention est relative à un dispositif de mélange hydraulique d'un coagulant dans un courant principal de liquide, à l'intérieur d'une canalisation.The invention relates to a device for hydraulic mixing of a coagulant in a main stream of liquid, inside a pipe.
On rappelle qu'un coagulant est un réacteur chimique qui est injecté et mélangé dans un liquide de viscosité peu élevée à haut nombre de Reynolds, tel que l'eau brute, afin que colloïdes et agrégats en suspension dans le liquide soient déstabilisés et forment des flocs. Plus le mélange est rapide, meilleure est la coagulation • ' en moins d'une seconde, la réaction chimique qui régit le principe de coagulation est terminée avant que le coagulant ne précipite.It is recalled that a coagulant is a chemical reactor which is injected and mixed in a liquid of low viscosity with high Reynolds number, such as raw water, so that colloids and aggregates suspended in the liquid are destabilized and form floc. The faster the mixture, the better the coagulation. In less than one second, the chemical reaction that governs the coagulation principle is complete before the coagulant precipitates.
Un dispositif de mélange hydraulique de coagulant doit permettre à la fois la dispersion du coagulant à l'intérieur de la canalisation, et le temps nécessaire à la réaction chimique.A hydraulic coagulant mixing device must allow both the dispersion of the coagulant inside the pipe, and the time required for the chemical reaction.
D'après US-A-6 422 735, on connaît un dispositif de mélange hydraulique de coagulant dans un courant principal de liquide, à l'intérieur d'une canalisation, qui comprend '•From US-A-6,422,735 there is known a hydraulic coagulant mixing device in a main stream of liquid, within a pipe, which comprises
- une buse d'injection d'un jet auxiliaire de liquide sous pression dans le courant principal, sensiblement parallèlement à la direction d'écoulement dans la canalisation,an injection nozzle for an auxiliary jet of liquid under pressure in the main stream, substantially parallel to the direction of flow in the pipe,
- un moyen déflecteur placé dans la canalisation, contre lequel est dirigé le jet auxiliaire, le moyen déflecteur assurant une déviation transversale, essentiellement radiale, du jet auxiliaire, et - un moyen d'introduction du coagulant dans le jet auxiliaire de liquide sous pression.- Baffle means placed in the pipe, against which is directed the auxiliary jet, the deflector means ensuring a transverse, substantially radial, deviation of the auxiliary jet, and - a coagulant introduction means in the auxiliary jet of liquid under pressure.
Un tel mélangeur par jet auxiliaire de liquide est bien adapté aux canalisations de diamètre élevé, notamment aux canalisations de diamètre supérieur à 2 m (deux mètres). L'injection du jet auxiliaire, généralement d'eau pressurisée, peut se faire à αrcourant ou contre- courant de l'écoulement principal.Such a liquid auxiliary jet mixer is well suited to high diameter pipes, especially pipes of diameter greater than 2 m (two meters). The injection of the auxiliary jet, generally of pressurized water, can be done at a current or countercurrent of the main flow.
Le jet auxiliaire de liquide peut être obtenu par pompage d'une fraction du liquide du courant principal, notamment de l'eau brute ou de l'eau filtrée en aval, afin de créer un courant d'eau rapide entraînant la dispersion du coagulant. Le coagulant doit être injecté rapidement, près du courant d'eau pressurisée, dans la canalisation d'eau brute afin d'éviter les phénomènes de pré-coagulation. En particulier, les coagulants d'origine métallique réagissent très rapidement avec l'eau et peuvent, sous certaines conditions de pH, précipiter avant d'être dispersés. Les systèmes d'injection du coagulant risquent ainsi l'obturation par le coagulant qui précipite. D'autres risques d'obturation des systèmes d'injection de coagulant sont créés par les débris présents dans l'eau motrice, en particulier si cette eau n'est pas filtrée. L'invention a pour but, surtout, de fournir un dispositif de mélange hydraulique du genre défini précédemment qui, tout en permettant d'assurer une bonne homogénéité de répartition du réactif coagulant, permet d'éviter ou de réduire la fréquence des bouchages ou obstructions diverses du moyen d'introduction du coagulant dans le jet auxiliaire de liquide sous pression. Il est souhaitable en outre que le dispositif de mélange hydraulique reste d'une construction simple et économique.The liquid auxiliary jet can be obtained by pumping a fraction of the main stream liquid, especially raw water or downstream filtered water, to create a rapid stream of water causing the dispersion of the coagulant. The coagulant should be injected rapidly, near the pressurized water stream, into the raw water line to prevent pre-coagulation. In particular, coagulants of metal origin react very rapidly with water and can, under certain pH conditions, precipitate before being dispersed. The coagulant injection systems may thus clog the coagulant which precipitates. Other risks of clogging coagulant injection systems are created by the debris present in the driving water, especially if this water is not filtered. The object of the invention is, above all, to provide a hydraulic mixing device of the kind defined above which, while making it possible to ensure good homogeneity in the distribution of the coagulating reagent, makes it possible to avoid or reduce the frequency of blockages or obstructions. various means of introducing the coagulant into the auxiliary jet of liquid under pressure. It is further desirable that the hydraulic mixing device remains of simple and economical construction.
Selon l'invention, un dispositif de mélange hydraulique de coagulant dans un courant principal de liquide, à l'intérieur d'une canalisation, comprend :According to the invention, a device for hydraulic mixing of coagulant in a main stream of liquid, inside a pipe, comprises:
- une buse d'injection d'un jet auxiliaire de liquide sous pression dans le courant principal, sensiblement parallèlement à la direction d'écoulement dans la canalisation,an injection nozzle for an auxiliary jet of liquid under pressure in the main stream, substantially parallel to the direction of flow in the pipe,
- un moyen déflecteur placé dans la canalisation, contre lequel est dirigé le jet auxiliaire, le moyen déflecteur assurant une déviation transversale, essentiellement radiale, du jet auxiliaire,a baffle means placed in the pipe against which the auxiliary jet is directed, the baffle means providing a transverse, essentially radial, deflection of the auxiliary jet,
- un moyen d'introduction du coagulant dans le jet auxiliaire de liquide sous pression, et est caractérisé en ce que le moyen d'introduction du coagulant est disposé à l'extérieur de la buse au voisinage de la sortie pour réaliser une injection du coagulant dans le jet auxiliaire suivant sensiblement la même direction d'ensemble que le jet auxiliaire, vers le moyen déflecteur.a means for introducing the coagulant into the auxiliary jet of liquid under pressure, and is characterized in that the means for introducing the coagulant is disposed outside the nozzle in the vicinity of the outlet in order to inject the coagulant in the auxiliary jet following substantially the same overall direction as the auxiliary jet, towards the deflector means.
Avantageusement, le moyen d'introduction du coagulant est disposé autour de la sortie de la buse d'injection pour réaliser une injection annulaire du coagulant dans le jet auxiliaire de liquide sous pression.Advantageously, the coagulant introduction means is disposed around the outlet of the injection nozzle to perform an annular injection of the coagulant into the auxiliary jet of liquid under pressure.
De préférence, la buse d'injection présente un orifice de sortie circulaire et le moyen d'introduction du coagulant présente un contour annulaire concentrique à la buse de sortie.Preferably, the injection nozzle has an outlet orifice circular and the means for introducing the coagulant has an annular contour concentric with the outlet nozzle.
La buse d'injection peut avoir une forme tronconique de révolution dont la petite base constitue l'orifice de sortie, et le moyen d'introduction comprend une enveloppe tronconique entourant la buse et déterminant une chambre annulaire.The injection nozzle may have a frustoconical shape of revolution whose small base constitutes the outlet orifice, and the introduction means comprises a frustoconical envelope surrounding the nozzle and determining an annular chamber.
L'arrivée de coagulant liquide sous pression dans la chambre annulaire entourant la buse peut être assurée par une canalisation orientée radialement. Des cloisons sont avantageusement prévues entre la surface extérieure de la buse et l'enveloppe, notamment pour la fixation de cette dernière. Les cloisons peuvent être situées dans des plans radiaux passant par l'axe de la buse pour orienter l'injection de coagulant suivant la direction du jet auxiliaire. En variante, les cloisons peuvent être inclinées par rapport à l'axe selon un angle favorable à la mise en rotation du jet de coagulant et à la création de turbulences.The arrival of liquid coagulant under pressure in the annular chamber surrounding the nozzle may be provided by a radially oriented pipe. Partitions are advantageously provided between the outer surface of the nozzle and the envelope, in particular for fixing the latter. The partitions can be located in radial planes passing through the axis of the nozzle to guide the coagulant injection in the direction of the auxiliary jet. Alternatively, the partitions may be inclined relative to the axis at an angle favorable to the rotation of the coagulant jet and the creation of turbulence.
De préférence, le moyen déflecteur présente une surface de révolution dont la méridienne est formée par deux arcs de courbe concaves tournant leur concavité vers la sortie de la buse et se rejoignant à une extrémité en une pointe située sur l'axe de la buse, les arcs , à leur autre extrémité, étant sensiblement tangents à un plan orthogonal audit axe.Preferably, the deflector means has a surface of revolution whose meridian is formed by two concave curve arcs turning their concavity towards the exit of the nozzle and joining at one end at a point located on the axis of the nozzle, the arcs, at their other end, being substantially tangent to a plane orthogonal to said axis.
Avantageusement, la chambre annulaire d'injection du coagulant fait face aux arcs concaves du déflecteur.Advantageously, the annular chamber for injecting the coagulant faces the concave arches of the deflector.
Une chicane peut être prévue dans la canalisation en aval du déflecteur. La chicane peut comprendre une paroi annulaire orthogonale à l'axe de la canalisation et faisant saillie depuis la paroi interne de la canalisation. La distance axiale (δ) entre la chicane et le déflecteur peut être d'environ 1.3 m.A baffle may be provided in the pipe downstream of the baffle. The baffle may comprise an annular wall orthogonal to the axis of the pipe and protruding from the inner wall of the pipe. The axial distance (δ) between the baffle and the deflector can be about 1.3 m.
L'invention consiste, mises à part les dispositions exposées ci- dessus, en un certain nombre d'autres dispositions dont il sera plus explicitement question ci-après à propos d'exemples de réalisation décrits avec référence aux dessins annexés, mais qui ne sont nullement limitatifs. Sur ces dessins :The invention consists, apart from the arrangements set out above, in a certain number of other arrangements which will be more explicitly discussed below with regard to embodiments described with reference to the accompanying drawings, but which are not in no way limiting. On these drawings:
Fig.l est une coupe verticale schématique partielle illustrant l'installation d'un dispositif de mélange hydraulique selon l'invention dans une canalisation enterrée.Fig.l is a partial schematic vertical section illustrating the installation of a hydraulic mixing device according to the invention in a buried pipe.
Fig.2 est une coupe verticale à plus grande échelle du dispositif de mélange hydraulique de Fig.l.Fig.2 is a vertical section on a larger scale of the device hydraulic mixing of Fig.l.
Fig.3 est un schéma en coupe verticale, à plus petite échelle que Fig.2, illustrant l'évolution spatiale du coagulant après l'injection.Fig.3 is a diagram in vertical section, on a smaller scale than Fig.2, illustrating the spatial evolution of the coagulant after injection.
Fig.4 est une vue en perspective de trois-quarts avant du dispositif de mélange.Fig.4 is a perspective view of three-quarters front of the mixing device.
Fig.5 est une vue de dessus du dispositif de mélange.Fig.5 is a top view of the mixing device.
Fig.6 est une coupe verticale schématique, à petite échelle, d'une variante avec chicane, etFIG. 6 is a schematic vertical section, on a small scale, of a variant with a chicane, and
Fig.7 est un schéma illustrant la dispersion de coagulant derrière la chicane de Fig.6.Fig.7 is a diagram illustrating the coagulant dispersion behind the baffle of Fig.6.
En se reportant à Fig.l des dessins, on peut voir une canalisation enterrée C cylindrique de révolution, ayant un diamètre intérieur D élevé, c'est-à-dire supérieur à 2 m (deux mètres), d'axe géométrique X-X. Un courant principal de liquide, de l'eau brute dans l'exemple considéré, s'écoule dans la canalisation C suivant le sens des flèches F, de la gauche vers la droite de Fig.l.Referring to Fig.l of the drawings, there can be seen a buried pipe C cylindrical of revolution, having a high internal diameter D, that is to say greater than 2 m (two meters), geometric axis X-X. A main stream of liquid, raw water in the example considered, flows in the pipe C in the direction of arrows F, from left to right of Fig.l.
Un dispositif de mélange hydraulique 1 d'un coagulant 2 (Fig.3) dans le courant principal d'eau brute est placé suivant l'axe de la canalisation C. Pour la mise en place de ce dispositif 1, on prévoit un puits vertical 3, communiquant avec l'intérieur de la canalisation C et débouchant au-dessus de la surface du sol S. Un montant vertical 4 est fixé dans le puits 3. Ce montant 4 permet le maintien d'une canne (non visible) verticale pour l'alimentation en eau brute sous pression d'une buse 5 d'injection du dispositif 1.A hydraulic mixing device 1 of a coagulant 2 (FIG. 3) in the main flow of raw water is placed along the axis of the pipe C. For the introduction of this device 1, a vertical well is provided. 3, communicating with the interior of the pipe C and opening above the surface of the ground S. A vertical upright 4 is fixed in the well 3. This amount 4 allows the maintenance of a rod (not visible) vertical for the raw water supply under pressure of an injection nozzle 5 of the device 1.
La buse 5 (Fig.2) a une forme tronconique de révolution convergente vers la sortie 6 délimitée par une paroi cylindrique . La buse 5 est située à l'extrémité de la branche horizontale 7 d'un coude 8 à angle droit dont l'autre extrémité est munie d'une collerette 9 pour raccordement étanche à la canne verticale (non visible) d'amenée d'eau brute sous pression. En position de travail, l'axe géométrique de la partie 7 et de la buse 5 est horizontal confondu avec l'axe X-X de la canalisation C, tandis que la collerette 9 est dans un plan horizontal au-dessus de la buse 5 . Cette buse 5 permet d'injecter un jet auxiliaire de liquide sous pression, dans le courant principal, sensiblement parallèlement à la direction d'écoulement F.The nozzle 5 (FIG. 2) has a truncated conical shape of revolution towards the outlet 6 delimited by a cylindrical wall. The nozzle 5 is located at the end of the horizontal branch 7 of a bend 8 at right angles whose other end is provided with a flange 9 for sealing connection to the vertical rod (not visible) of supply of raw water under pressure. In the working position, the geometric axis of the part 7 and the nozzle 5 is horizontal coincident with the axis X-X of the pipe C, while the collar 9 is in a horizontal plane above the nozzle 5. This nozzle 5 makes it possible to inject an auxiliary jet of liquid under pressure into the main stream, substantially parallel to the flow direction F.
Un déflecteur 10 est placé dans la canalisation. Le jet sortant de la buse 5 est dirigé contre le déflecteur 10. Ce déflecteur présente une surface de révolution dont l'axe est confondu avec celui de la buse 5. La méridienne de cette surface de révolution est formée par deux arcs de courbe concaves 10a, 10b tournant leur concavité vers la buse et se rejoignant à une extrémité en une pointe 11 située sur l'axe de la buse 5 pratiquement à la sortie de la buse. Les arcs 10a, 10b, notamment formés par des quarts de cercle, à leur extrémité éloignée de la pointe 11 sont sensiblement tangents à un plan orthogonal à l'axe X-X.A deflector 10 is placed in the pipe. The outgoing stream of the nozzle 5 is directed against the deflector 10. This deflector has a surface of revolution whose axis coincides with that of the nozzle 5. The meridian of this surface of revolution is formed by two concave curve arcs 10a, 10b rotating their concavity towards the nozzle and joining at one end in a point 11 located on the axis of the nozzle 5 substantially at the outlet of the nozzle. The arcs 10a, 10b, in particular formed by quarter circles, at their end remote from the tip 11 are substantially tangent to a plane orthogonal to the axis XX.
Le déflecteur 10 est fixé sur une plaque verticale 12 d'un support 13 maintenu, relativement à la buse 5, par un ensemble de tiges filetées 14 horizontales et d'écrous 15. Les tiges 14, à leur extrémité éloignée de la plaque 12, sont engagées et maintenues dans des trous d'une collerette 16 orthogonale à l'axe de la buse 5 et fixée autour de la partie cylindrique 7. Un moyen d'introduction 17 du coagulant, sous forme liquide ou en solution, est disposé à l'extérieur de la buse 5 au voisinage de la sortie pour réaliser une injection du coagulant dans le jet auxiliaire de liquide sous pression, suivant sensiblement la même direction d'ensemble que celle du jet auxiliaire, vers le moyen déflecteur 10. Le moyen d'introduction 17 est avantageusement disposé autour de la sortie 6 de la buse 5 pour réaliser une injection annulaire du coagulant. Le moyen d'introduction 17 présente un contour annulaire 18 (Fig.4) concentrique à la buse de sortie.The deflector 10 is fixed on a vertical plate 12 of a support 13 held, relative to the nozzle 5, by a set of horizontal threaded rods 14 and nuts 15. The rods 14, at their end remote from the plate 12, are engaged and held in holes of a collar 16 orthogonal to the axis of the nozzle 5 and fixed around the cylindrical portion 7. A means 17 for introducing the coagulant, in liquid form or in solution, is disposed at outside the nozzle 5 in the vicinity of the outlet to perform an injection of the coagulant into the auxiliary jet of liquid under pressure, in substantially the same overall direction as that of the auxiliary jet, to the deflector means 10. The means of introduction 17 is advantageously arranged around the outlet 6 of the nozzle 5 to perform an annular injection of the coagulant. The introduction means 17 has an annular contour 18 (FIG. 4) concentric with the outlet nozzle.
Le moyen d'introduction 17 comprend une enveloppe tronconique 19 de révolution coaxiale et parallèle à la buse 5. La grande base de l'enveloppe 19 est fixée sur la collerette 16, la petite base de l'enveloppe 19 se trouve dans le plan de sortie de l'orifice 6. Du fait que la sortie 6 est délimitée par une paroi cylindrique, la dimension radiale de l'espace ou chambre annulaire 20 compris entre l'enveloppe 9 et la buse 5 diminue jusqu'à la sortie au niveau de la partie 6. Cette diminution de section provoque une augmentation de la vitesse de sortie du coagulant favorable à un mélange rapide.The introduction means 17 comprises a frustoconical envelope 19 of coaxial revolution and parallel to the nozzle 5. The large base of the envelope 19 is fixed on the collar 16, the small base of the envelope 19 is in the plane of leaving the orifice 6. Because the outlet 6 is delimited by a cylindrical wall, the radial dimension of the space or annular chamber 20 between the casing 9 and the nozzle 5 decreases to the outlet at the level of Part 6. This reduction in section causes an increase in the exit rate of the coagulant favorable to rapid mixing.
L'arrivée de coagulant liquide sous pression dans la chambre annulaire 20 tronconique est assurée par une canalisation 21 (Fig.4) orientée tangentiellement à la grande base de l'enveloppe 19. L'extrémité de la canalisation 21 éloignée de l'enveloppe 19 est munie d'une bride de raccordement 22. Des cloisons 23 sont prévues entre la surface extérieure de la buse 5 et la surface intérieure de l'enveloppe 19. Les cloisons 23 sont réparties angulairement, à intervalles réguliers. Leur nombre peut être égal à huit. Les cloisons 23 débutent sensiblement à mi-longueur de l'espace annulaire 20, à distance de la collerette 16 et s'étendent jusqu'à l'extrémité de sortie de l'espace annulaire. Ces cloisons 23 ont une fonction mécanique de maintien, par exemple par soudure, de l'enveloppe 19 relativement à la buse 5, et un rôle hydraulique pour diriger le jet de sortie du coagulant. Chaque cloison 23 peut être située dans un plan radial passant par l'axe géométrique de la buse 5 de manière à orienter en sortie le jet de coagulant (qui est introduit tangentiellement par la canalisation 21) suivant une direction d'ensemble voisine de celle du courant principal. En variante, les cloisons 23 peuvent être inclinées, par exemple de 45°, par rapport à l'axe géométrique de la buse 5 pour provoquer en sortie une turbulence .The arrival of liquid coagulant under pressure in the frustoconical annular chamber 20 is provided by a pipe 21 (FIG. 4) oriented tangentially to the large base of the casing 19. The end of the pipe 21 remote from the casing 19 is provided with a connection flange 22. Partitions 23 are provided between the outer surface of the nozzle 5 and the inner surface of the envelope 19. The partitions 23 are distributed angularly at regular intervals. Their number can be equal to eight. The partitions 23 start substantially at mid-length of the annular space 20, at a distance from the flange 16 and extend up to the exit end of the annular space. These partitions 23 have a mechanical function of holding, for example by welding, the casing 19 relative to the nozzle 5, and a hydraulic role to direct the outlet jet of the coagulant. Each partition 23 may be situated in a radial plane passing through the geometric axis of the nozzle 5 so as to orientate at its outlet the coagulant jet (which is introduced tangentially through the pipe 21) in an overall direction close to that of the mainstream. Alternatively, the partitions 23 may be inclined, for example 45 °, relative to the geometric axis of the nozzle 5 to cause turbulence output.
La chambre annulaire 20 débouche face à la surface concave des arcs 10a, 10b du déflecteur.The annular chamber 20 opens out facing the concave surface of the arcs 10a, 10b of the deflector.
L'arrivée sous pression du coagulant liquide ou en solution est assurée par une canalisation G (Fig.l) raccordée à la canalisation 21.The arrival under pressure of the coagulant liquid or in solution is provided by a pipe G (Fig.l) connected to the pipe 21.
L'injection de coagulant et son mélange avec l'eau brute s'effectuent comme illustré sur Fig.3.The injection of coagulant and its mixing with the raw water are carried out as illustrated in FIG.
Le jet auxiliaire d'eau brute sous pression est injecté par la buse 5 sensiblement parallèlement à la direction du courant principal dans la canalisation C. Sous l'effet du déflecteur 10, le jet auxiliaire s'épanouit radialement en une nappe 24 suivant toute la section de la canalisation C. Le coagulant, injecté autour du jet auxiliaire, s'épanouit suivant une couche 25 en amont de la nappe 24 et se mélange quasi instantanément avec l'eau brute du courant principal dans la canalisation C.The auxiliary stream of pressurized raw water is injected through the nozzle 5 substantially parallel to the direction of the main stream in the pipe C. Under the effect of the baffle 10, the auxiliary jet radiates radially into a sheet 24 along the entire section of the pipe C. The coagulant, injected around the auxiliary jet, blooms along a layer 25 upstream of the sheet 24 and mixes almost instantaneously with the raw water of the main stream in the pipe C.
Le mélange rapide du coagulant permet d'augmenter l'efficacité du traitement et de réduire les quantités de coagulant utilisées, donc de réduire les dépenses.The rapid mixing of the coagulant increases the effectiveness of the treatment and reduces the amounts of coagulant used, thus reducing expenses.
La couche fine 25 de coagulant est entraînée par la nappe 24 d'eau brute. Le mélange du coagulant avec l'eau du courant principal est effectué pratiquement sans dilution préalable du coagulant.The thin layer of coagulant is entrained by the web 24 of raw water. The mixing of the coagulant with the water of the main stream is carried out practically without prior dilution of the coagulant.
Le temps de mélange du coagulant avec l'eau brute du courant principal est inférieur à 2 s (deux secondes) et peut être de l'ordre de 0.1 s.The mixing time of the coagulant with the raw water of the current principal is less than 2 s (two seconds) and can be of the order of 0.1 s.
La vitesse du courant dans le jet auxiliaire délivré par la buse 5 est avantageusement de 20 m/s, mais des vitesses inférieures, notamment de l'ordre de 13 m/s restent acceptables tout en entraînant une efficacité plus réduite.The speed of the current in the auxiliary jet delivered by the nozzle 5 is advantageously 20 m / s, but lower speeds, in particular of the order of 13 m / s remain acceptable while resulting in a lower efficiency.
Le dispositif d'injection selon l'invention permet de réduire la consommation de coagulant d'une valeur moyenne estimée à 10 %, ce qui entraîne une économie sensible en raison du volume important d'eau brute traitée dans les canalisations de diamètre élevé.The injection device according to the invention makes it possible to reduce the coagulant consumption by an average value estimated at 10%, which results in a significant saving because of the large volume of raw water treated in the pipes of large diameter.
Afin d'améliorer l'efficacité de dispersion du coagulant, notamment pour des vitesses inférieures à 20 m/s, par exemple de l'ordre de 13 m/s, on prévoit un système de cloisonnement 26 (Fig.6) composé d'une chicane 27 de type annulaire pour la canalisation C cylindrique. Dans le cas d'un canal ouvert à l'air libre, de section rectangulaire, la chicane 27 serait rectangulaire. La paroi de la chicane 27 est orthogonale à l'axe géométrique de la canalisation et est fixée contre la surface intérieure de cette canalisation. La chicane 27 détermine une ouverture de passage 28 concentrique de diamètre inférieur à celui de la canalisation principale.In order to improve the efficiency of dispersion of the coagulant, especially for speeds of less than 20 m / s, for example of the order of 13 m / s, a partitioning system 26 (FIG. an annular type baffle 27 for the cylindrical channel C. In the case of a channel open to the open air, of rectangular section, the baffle 27 would be rectangular. The wall of the baffle 27 is orthogonal to the geometric axis of the pipe and is fixed against the inner surface of this pipe. The baffle 27 determines a concentric passage opening 28 of diameter smaller than that of the main pipe.
Le positionnement de la chicane 27, suivant l'axe principal de l'écoulement est de préférence situé au voisinage du point d'inflexion de la dispersion de coagulant. Dans un exemple étudié, avec une canalisation de diamètre intérieur égal à 3.2 m, la distance δ entre le point d'injection de coagulant (sortie de la buse 5) et la chicane 27 est égale à 1.3 m. La dimension radiale de la chicane annulaire est de 50 cm de sorte que le diamètre intérieur de la canalisation est réduit à 2.2 m à l'endroit du rétrécissement 28 créé par la chicane.The positioning of the baffle 27 along the main axis of the flow is preferably located in the vicinity of the point of inflection of the coagulant dispersion. In a studied example, with a pipe of internal diameter equal to 3.2 m, the distance δ between the coagulant injection point (outlet of the nozzle 5) and the baffle 27 is equal to 1.3 m. The radial dimension of the annular baffle is 50 cm so that the internal diameter of the pipe is reduced to 2.2 m at the narrowing 28 created by the baffle.
L'efficacité de dispersion pour une vitesse entraînante, à la sortie de la buse 5, de 13 m/s passe de 90 % à une fourchette comprise entre 95 et 98 %.The dispersion efficiency for a driving speed at the outlet of the nozzle 5 of 13 m / s increases from 90% to a range of between 95 and 98%.
Sur Fig.6, les flèches en tirets 29 schématisent l'épanouissement du coagulant sous l'effet du déflecteur. Les flèches 30 convergentes vers l'axe schématisent l'effet amont de la chicane 27 sur les courants de fluide en amont. Les flèches 31 schématisent le courant de fluide en aval de la chicane.In FIG. 6, the arrows in dashed lines 29 schematize the blooming of the coagulant under the effect of the deflector. The arrows converging towards the axis 30 schematize the upstream effect of the baffle 27 on the upstream fluid streams. Arrows 31 schematize the flow of fluid downstream of the baffle.
Sur Fig.7 les courants de fluide et de coagulant sont schématisés. Il apparaît que la couche 25 de coagulant est largement dispersée radialement immédiatement en aval de la chicane 27, ce qui favorise la dispersion et le mélange de coagulant.In Fig. 7 the fluid and coagulant streams are diagrammed. It appears that the coagulant layer is widely dispersed radially immediately downstream of the baffle 27, which promotes dispersion and mixing of coagulant.
Bien que les exemples décrits concernent des canalisations cylindriques à section circulaire, l'invention s'applique bien entendu à un canal d'écoulement situé à l'air libre, de section rectangulaire. Le dispositif d'injection serait placé suivant l'axe de ce canal.Although the described examples concern circular cylindrical pipes, the invention naturally applies to a flow channel located in the open air, of rectangular section. The injection device would be placed along the axis of this channel.
Dans les exemples considérés, le sens du jet auxiliaire de liquide sous pression débité par la buse 5 est le même que celui du courant principal, ce qui correspond à un fonctionnement du type co- courant. Une disposition inverse serait possible avec injection du jet auxiliaire en sens opposé, c'est-à-dire à contre -courant du débit principal suivant les flèches F. In the examples considered, the direction of the auxiliary jet of liquid under pressure delivered by the nozzle 5 is the same as that of the main stream, which corresponds to a co-current type operation. A reverse arrangement would be possible with injection of the auxiliary jet in the opposite direction, that is to say, against -courant of the main flow according to the arrows F.

Claims

REVENDICATIONS
1. Dispositif de mélange hydraulique (l) d'un coagulant dans un courant principal de liquide, à l'intérieur d'une canalisation(C), comprenant : - une buse (5) d'injection d'un jet auxiliaire de liquide sous pression dans le courant principal, sensiblement parallèlement à la direction d'écoulement dans la canalisation,1. Device for hydraulic mixing (l) of a coagulant in a main stream of liquid, inside a pipe (C), comprising: - a nozzle (5) for injecting an auxiliary jet of liquid under pressure in the main stream, substantially parallel to the flow direction in the pipe,
- un moyen déflecteur (10) placé dans la canalisation, contre lequel est dirigé le jet auxiliaire, le moyen déflecteur assurant une déviation transversale, essentiellement radiale, du jet auxiliaire,- a deflector means (10) placed in the pipe, against which is directed the auxiliary jet, the deflector means ensuring a transverse, essentially radial, deviation of the auxiliary jet,
- un moyen d'introduction (17) du coagulant dans le jet auxiliaire de liquide sous pression, caractérisé en ce que le moyen d'introduction (17) du coagulant est disposé à l'extérieur de la buse (5) au voisinage de la sortie (6) pour réaliser une injection du coagulant dans le jet auxiliaire suivant sensiblement la même direction d'ensemble que le jet auxiliaire, vers le moyen déflecteur (10).- A means (17) for introducing the coagulant into the auxiliary jet of pressurized liquid, characterized in that the means (17) for introducing the coagulant is disposed outside the nozzle (5) in the vicinity of the outlet (6) for injecting the coagulant into the auxiliary jet in substantially the same overall direction as the auxiliary jet, to the deflector means (10).
2. Dispositif d'injection selon la revendication 1, caractérisé en ce que le moyen d'introduction (17) du coagulant est disposé autour de la sortie (6) de la buse d'injection pour réaliser une injection annulaire du coagulant dans le jet auxiliaire de liquide sous pression .2. Injection device according to claim 1, characterized in that the introduction means (17) of the coagulant is arranged around the outlet (6) of the injection nozzle to perform an annular injection of the coagulant in the jet auxiliary fluid under pressure.
3. Dispositif d'injection selon la revendication 1 ou 2, dans lequel la buse d'injection (5) présente un orifice de sortie circulaire, caractérisé en ce que le moyen d'introduction (17) du coagulant présente un contour annulaire (18) concentrique à la buse de sortie.3. Injection device according to claim 1 or 2, wherein the injection nozzle (5) has a circular outlet, characterized in that the introduction means (17) of the coagulant has an annular contour (18). ) concentric to the outlet nozzle.
4. Dispositif d'injection selon la revendication 2 ou 3, caractérisé en ce que la buse d'injection (5) a une forme tronconique de révolution dont la petite base constitue l'orifice de sortie (6), et que le moyen d'introduction (17) comprend une enveloppe tronconique (19) entourant la buse (5) et déterminant une chambre annulaire (20).4. Injection device according to claim 2 or 3, characterized in that the injection nozzle (5) has a frustoconical shape of revolution whose small base constitutes the outlet orifice (6), and that the d introduction (17) comprises a frustoconical envelope (19) surrounding the nozzle (5) and determining an annular chamber (20).
5. Dispositif d'injection selon la revendication 4, caractérisé en ce que l'arrivée de coagulant liquide sous pression dans la chambre annulaire (20) entourant la buse (5) est assurée par une canalisation (21) orientée radialeinent.5. Injection device according to claim 4, characterized in that the inlet of liquid coagulant under pressure in the annular chamber (20) surrounding the nozzle (5) is provided by a channel (21) oriented radialeinent.
6. Dispositif d'injection selon la revendication 5, caractérisé en ce que des cloisons (23) sont prévues entre la surface extérieure de la buse (5) et l'enveloppe (19).6. Injection device according to claim 5, characterized in that partitions (23) are provided between the outer surface of the nozzle (5) and the casing (19).
7. Dispositif d'injection selon la revendication 6, caractérisé en ce que les cloisons (23) sont situées dans des plans radiaux passant par l'axe de la buse (5) pour orienter l'injection de coagulant.7. Injection device according to claim 6, characterized in that the partitions (23) are located in radial planes passing through the axis of the nozzle (5) to guide the injection of coagulant.
8. Dispositif d'injection selon la revendication 6, caractérisé en ce que les cloisons sont inclinées par rapport à l'axe selon un angle favorable à la mise en rotation du jet de coagulant et à la création de turbulences.8. Injection device according to claim 6, characterized in that the partitions are inclined relative to the axis at an angle favorable to the rotation of the coagulant jet and the creation of turbulence.
9. Dispositif d'injection selon l'une quelconque des revendications précédentes, caractérisé en ce que le déflecteur (10) présente une surface de révolution dont la méridienne est formée par deux arcs de courbe concaves (10a, 10b) tournant leur concavité vers la sortie de la buse (5) et se rejoignant à une extrémité en une pointe (il) située sur l'axe (X-X) de la buse, les arcs (10a, 10b) , à leur autre extrémité, étant sensiblement tangents à un plan orthogonal audit axe (X-X).9. Injection device according to any one of the preceding claims, characterized in that the deflector (10) has a surface of revolution whose meridian is formed by two concave curve arcs (10a, 10b) turning their concavity towards the outlet of the nozzle (5) and joining at one end in a tip (II) located on the axis (XX) of the nozzle, the arcs (10a, 10b), at their other end, being substantially tangent to a plane orthogonal to said axis (XX).
10. Dispositif d'injection selon l'ensemble des revendications 4 et 9, caractérisé en ce que la chambre annulaire (20) d'injection du coagulant fait face aux arcs concaves (10a, 10b) du déflecteur.10. Injection device according to claims 4 and 9, characterized in that the annular chamber (20) for injecting the coagulant faces the concave arches (10a, 10b) of the deflector.
11. Dispositif d'injection selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une chicane (26) est prévue dans la canalisation en aval du déflecteur (10).11. Injection device according to any one of the preceding claims, characterized in that a baffle (26) is provided in the pipe downstream of the deflector (10).
12. Dispositif d'injection selon la revendication 11, caractérisé en ce que la chicane (26) comprend une paroi annulaire (27) orthogonale à l'axe de la canalisation et faisant saillie depuis la paroi interne de la canalisation.12. Injection device according to claim 11, characterized in that the baffle (26) comprises an annular wall (27) orthogonal to the axis of the pipe and projecting from the inner wall of the pipe.
13. Dispositif d'injection selon la revendication 11 ou 12 , caractérisé en ce que la distance axiale (δ) entre la chicane et le déflecteur est d'environ 1.3 m. 13. Injection device according to claim 11 or 12, characterized in that the axial distance (δ) between the baffle and the deflector is about 1.3 m.
PCT/FR2005/001255 2004-06-09 2005-05-19 Device for hydraulic mixture of a coagulant into a main liquid stream WO2006005828A1 (en)

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FR0406245A FR2871392B1 (en) 2004-06-09 2004-06-09 DEVICE FOR HYDRAULIC MIXING OF A COAGULANT IN A MAIN CURRENT OF LIQUID
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2883601A1 (en) * 2013-12-16 2015-06-17 China Petrochemical Development Corporation, Taipei (Taiwan) Fluid mixing device
US10322383B2 (en) * 2015-03-06 2019-06-18 Fluid Quip, Inc. Radial flow processor and method for using same

Citations (3)

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Publication number Priority date Publication date Assignee Title
US4162971A (en) * 1976-07-31 1979-07-31 Bayer Aktiengesellschaft Injectors with deflectors for their use in gassing liquids
US6422735B1 (en) * 1999-09-20 2002-07-23 John Stewart Lang Hydraulic jet flash mixer with open injection port in the flow deflector
US20040094848A1 (en) * 2002-08-01 2004-05-20 Lange Neville Ernest Gas eductors and gas eductor flotation separators

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4162971A (en) * 1976-07-31 1979-07-31 Bayer Aktiengesellschaft Injectors with deflectors for their use in gassing liquids
US6422735B1 (en) * 1999-09-20 2002-07-23 John Stewart Lang Hydraulic jet flash mixer with open injection port in the flow deflector
US20040094848A1 (en) * 2002-08-01 2004-05-20 Lange Neville Ernest Gas eductors and gas eductor flotation separators

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2883601A1 (en) * 2013-12-16 2015-06-17 China Petrochemical Development Corporation, Taipei (Taiwan) Fluid mixing device
US10322383B2 (en) * 2015-03-06 2019-06-18 Fluid Quip, Inc. Radial flow processor and method for using same

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FR2871392A1 (en) 2005-12-16

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