EP0003202B1 - System for transforming a two-phase primary flow into several secondary flows - Google Patents

System for transforming a two-phase primary flow into several secondary flows Download PDF

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Publication number
EP0003202B1
EP0003202B1 EP19790400026 EP79400026A EP0003202B1 EP 0003202 B1 EP0003202 B1 EP 0003202B1 EP 19790400026 EP19790400026 EP 19790400026 EP 79400026 A EP79400026 A EP 79400026A EP 0003202 B1 EP0003202 B1 EP 0003202B1
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EP
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Prior art keywords
tubular body
phase fluid
blades
flow
hub
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EP19790400026
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German (de)
French (fr)
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EP0003202A3 (en
EP0003202A2 (en
Inventor
Marcel Arnaudeau
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IFP Energies Nouvelles IFPEN
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IFP Energies Nouvelles IFPEN
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/14—Diverting flow into alternative channels

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  • the present invention relates to a device for transforming a two-phase primary flow, for example composed of saturated liquid and free gas not dissolved in this liquid, into several secondary flows similar to the primary flow, in which the ratio of the volume of gas to that of the liquid making up these secondary flows is preferably substantially equal to that of the primary flow.
  • the treatments of these two-phase flows are carried out using apparatuses which generally have optimal performance when treating two-phase flows having characteristics corresponding to those provided during the manufacture of these devices.
  • the primary flow may be necessary to divide the primary flow into several secondary flows which, for the reasons indicated above, must have characteristics, such as free gas content, pressure, etc ..., which are constant over time. Preferably, these characteristics must be substantially identical to those of the primary flow.
  • This assembly comprises a main tube, a divider element inside which are formed radial cross partitions, and four outlet tubes, the ends of which are formed so as to constitute sectors in a quarter of a circle.
  • such a device can only be used for homogeneous flows.
  • it can only be used for a two-phase flow, consisting, for example, of a gas-liquid mixture, only if the spatial distribution of the phases in the flow is not appreciably affected by gravity effects.
  • this prior device gives poor results, particularly if it is arranged horizontally, due to the differential action of gravity on the gas and liquid phases.
  • the device according to the invention making it possible to eliminate this drawback is characterized in that it comprises in combination a hub (2) placed coaxially in the tubular body (1) with which it defines an annular space open at its two ends, this hub comprising blades (3a, 3b, 3c ...) and means (22) for stabilizing the flow making it possible to ensure symmetry of revolution in the distribution of the phases around the axis of the hub before the distribution of the fluid between said outlet conduits.
  • This device achieves, in effect, a laminated flow of revolution around the axis of the hub, this flow being cut radially by the blades.
  • the gaseous phase is thus evenly distributed between the various outlet conduits, as is the liquid phase.
  • FIG. 1 An embodiment of the device according to the invention is schematically represented in section in FIG. 1.
  • This device essentially comprises a tubular body 1, a hub 2, blades 3a, 3b, 3c ... and a set of outlet pipes 4a, 4b, 4c ...
  • connection means such as a fixing flange 6 allowing, by means of screws or bolts shown diagrammatically at 7, the watertight fixing of the device in the extension of a pipe 8, drawn in broken lines, in which the primary flow of two-phase fluid takes place in the direction indicated by the arrows F.
  • the hub 2 the outside diameter of which is less than the diameter of the bore of the body 1 is held coaxially inside this bore with which it delimits an annular space.
  • the hub 2 is, on the side of the inlet 5, extended by a profiled part 9 making it possible to minimize the disturbances in the flow of the primary two-phase fluid, when it enters the device.
  • the bore of the body 1 and the outer surface of the hub 2 are cylindrical and delimit an annular space whose cross section is constant, but it would not depart from the scope of the invention if one and / or the other of these surfaces was conical and if, consequently, the cross section of the annular space varied.
  • Blades such as 3a, 3b, 3c and 3d which are all visible in FIG. 2 (which is a view on the left of FIG. 1) divide the annular space comprised between the hub 2 and the bore of the body 1 into compartments 10a, 10b, 10c, 10d, substantially tight relative to one another and opening out at the ends of the body 1.
  • These blades which can be flat and arranged radially in the annular space delimited by the body 1 and the hub 2, or which can be preformed as will be indicated. subsequently, are fixed by any suitable means, such as welding, etc., either on the hub 2, or on the body 1, or even on both at the same time. Optionally, they can maintain the hub 2 in position inside the body 1.
  • n of blades can vary depending on requirements. Four have been shown, by way of example, in the figures, but in general, this number depends on the number of secondary flows that it is desired to obtain.
  • the end of the body 1 opposite the inlet 5 ( Figure 1) is closed by a cover 11 fixed to the body 1 for example by screws or bolts 12 cooperating with a fixing flange 13 of the body 1.
  • This cover can also maintain the hub 2 in position, for example, by means of a fixing screw shown diagrammatically at 19.
  • the cover 11 is provided with orifices 14a, 14b, 14c ... in a number equal to the number of blades and it is positioned so that each orifice communicates exclusively with one of the compartments delimited by two consecutive blades.
  • each of these orifices has the form of an annular sector of the same section as the compartment with which it communicates, this section being measured along a plane perpendicular to the longitudinal axis of the body 1.
  • Each orifice 14a, 14b .. of the cover 11 communicates exclusively with a conduit such as 4a, 4b, 4c ... fixed on the cover 11.
  • each of these conduits has a section whose surface area preferably remains constant but whose shape changes, as shown in Figures 4, 5, 6 which are sections along lines IV, V and VI of Figure 1.
  • conduits all visible in Figure 3, which is a right view of Figure 1, can be connected to pipes such as 15, 16, 17 ... shown in broken lines and that the device according to the invention supplies in two-phase fluid.
  • the operation of the device is simple.
  • the primary flow of two-phase fluid is divided into as many secondary two-phase flows as there are compartments 10a, 10b, 10c ... and each of these secondary flows is directed to one of the use pipes 15, 16, 17 ... by one of the corresponding conduits 4a, 4b, 4c ...
  • the blades 3a, 3b, 3c ... will advantageously be blades planes placed radially and profiled so as not to disturb the flow, as shown in FIG. 7 which is a developed view of the hub 2 carrying the blades.
  • the profile of each blade may or may not be warped to that at any point on the leading edge, the angle of inclination of the blade (fig. 8) satisfies the relation R being the distance from the point considered to the axis of the device.
  • the blades may have a profile whose radius of curvature decreases from the inlet to the outlet.
  • the pipes 4a, 4b, 4c and 4d may be preformed so that their axes at the level of the cover 11 are substantially parallel to the angle formed by the blades with the axis of the device.
  • the device illustrated in FIGS. 1 to 9 makes it possible to transform a two-phase primary flow into several secondary flows which will have a free gas content little different from that of the primary flow, when the distribution of the phases has a symmetry of revolution around l 'axis of the primary flow at the inlet of the body 1. In all other cases, the free gas contents of the secondary flows will be different.
  • This assembly essentially comprises an intake manifold 21, a stabilizing element 22 and possibly a member 23 adapted to increase the pressure of the two-phase fluid before its introduction into the body 1.
  • the intake manifold 21 is a manifold bent along a large radius of curvature, so as not to introduce a significant pressure drop in the primary flow.
  • the stabilizing member 22 can be of any known type and is intended to keep the content of free gas in the primary flow substantially constant, or at least to prevent this content from undergoing rapid variations.
  • this stabilizing member could be of the helical-axial pump type, such as the pumping member for two-phase fluid described in French patent application FR-A No. 2,333,139.
  • this stabilizer member comprises a plurality of hubs 24 integral in rotation with a shaft 28 driven by a motor 32 ( Figure 10) whose speed of rotation is preferably continuously adjustable.
  • Each of the hubs 24 carries blades 25 whose radius of curvature as well as the angle formed by the axis of rotation and the tangent to the profile of each blade decrease in the direction of flow of the two-phase fluid.
  • rectifiers comprising blades 26 integral with the housing 33 of the stabilizer 22 and which are also integral with a hub 27 of tubular shape.
  • the shaft 25 passes through all the hubs 27, at least some of which also constitute rolling bearings of the shaft 28 with, if necessary, interposition of ball bearings (not shown in the drawings).
  • a pumping member 23 whose purpose is to increase the pressure of the two-phase fluid after stabilization, to compensate for the pressure losses.
  • This pumping member comprises a hub 29 which carries blades 30 whose profile, adapted to increase the pressure of the two-phase fluid, is of the type described in the French patent application cited above.
  • This hub 29 is rotated by a drive shaft which in the case illustrated in FIG. 11 is the shaft 28 but can also be a different shaft 31 driven by a second motor, not shown, which can have a variable speed.
  • the speed of rotation of the motor shaft (s) is adjusted to obtain the best results, depending on the flow conditions of the two-phase fluid.
  • the distribution of the blades 3a, 3b, 3c ... on the hub 2 can be made as a function of the relative flow rate of each secondary flow with respect to the primary flow.
  • these blades can be evenly distributed when the secondary flows have the same flow, but the angular spacing between two consecutive blades can be increased to obtain a greater flow of the secondary flow that they delimit, or decreased in the opposite case. .

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

La présente invention concerne un dispositif pour transformer un écoulement primaire diphasique, par example composé de liquide saturé et de gaz libre non dissous dans ce liquide, en plusieurs écoulements secondaires semblables à l'écoulement primaire, dans lequel le rapport du volume de gaz à celui du liquide composant ces écoulements secondaires est de préférence sensiblement égal à celui de l'écoulement primaire.The present invention relates to a device for transforming a two-phase primary flow, for example composed of saturated liquid and free gas not dissolved in this liquid, into several secondary flows similar to the primary flow, in which the ratio of the volume of gas to that of the liquid making up these secondary flows is preferably substantially equal to that of the primary flow.

Dans certains domaines techniques, tels que, en particulier mais non exclusivement, le domaine pétrolier, on est conduit à traiter des écoulements diphasiques, par exemple des écoulements composés du mélange d'au moins un liquide saturé avec au moins un gaz libre qui, dans les conditions thermodynamiques considérées, n'est pas dissous dans le liquide.In certain technical fields, such as, in particular but not exclusively, the petroleum field, it is necessary to treat two-phase flows, for example flows composed of the mixture of at least one saturated liquid with at least one free gas which, in the thermodynamic conditions considered, is not dissolved in the liquid.

Les traitements de ces écoulements diphasiques (en vue par exemple de créer une augmentation de leur pression, la séparation de la phase gazeuse et de la phase liquide, etc ...) se font à l'aide d'appareillages qui généralement, ont des performances optimales lorsqu'ils traitent des écoulements diphasiques ayant des caractéristiques correspondant à celles prévues lors de la fabrication de ces appareillages.The treatments of these two-phase flows (in order for example to create an increase in their pressure, the separation of the gaseous phase and the liquid phase, etc.) are carried out using apparatuses which generally have optimal performance when treating two-phase flows having characteristics corresponding to those provided during the manufacture of these devices.

Parfois, notamment lorsque le débit du fluide à traiter est important, on peut avoir besoin de répartir l'écoulement primaire en plusieurs écoulements secondaires qui, pour les raisons indiquées plus haut, doivent avoir des caractéristiques, telles que teneur en gaz libre, pression, etc ..., qui sont constantes dans le temps. De préférence, ces caractéristiques doivent être sensiblement identiques à celles de l'écoulement primaire.Sometimes, especially when the flow rate of the fluid to be treated is high, it may be necessary to divide the primary flow into several secondary flows which, for the reasons indicated above, must have characteristics, such as free gas content, pressure, etc ..., which are constant over time. Preferably, these characteristics must be substantially identical to those of the primary flow.

On connaît déjà par le brevent allemand DE-C-800,713 un ensemble diviseur dans lequel un écoulement d'entrée est divisé en quatre écoulements de sortie.Already known from the German brevent DE-C-800,713 a divider assembly in which an inlet flow is divided into four outlet flows.

Cet ensemble comporte un tube principal, un élément diviseur à l'intérieur duquel sont formées des cloisons radiales en croix, et quatre tubes de sortie dont les extrémités sont formées de manière à constituer des secteurs en quart de cercle.This assembly comprises a main tube, a divider element inside which are formed radial cross partitions, and four outlet tubes, the ends of which are formed so as to constitute sectors in a quarter of a circle.

Un tel dispositif n'est cependant utilisable que pour des écoulements homogènes. En particulier, il ne peut être utilisé pour un écoulement diphasique, constitué, par exemple, d'un mélange gaz-liquide, que si la répartition spatiale des phases dans l'écoulement n'est pas sensiblement affectée par des effets de gravité.However, such a device can only be used for homogeneous flows. In particular, it can only be used for a two-phase flow, consisting, for example, of a gas-liquid mixture, only if the spatial distribution of the phases in the flow is not appreciably affected by gravity effects.

Si la proportion massique de la phase liquide est importante, ce dispositif antérieur donne de mauvais résultats, particulièrement s'il est disposé horizontalement, en raison de l'action différentielle de la gravité sur les phases gazeuse et liquide.If the mass proportion of the liquid phase is large, this prior device gives poor results, particularly if it is arranged horizontally, due to the differential action of gravity on the gas and liquid phases.

Le dispositif selon l'invention permettant de supprimer cet inconvénient est caractérise en ce qu'il comporte en combinaison un moyeu (2) placé coaxialement dans le corps tubulaire (1) avec lequel il définit un espace annulaire ouvert à ses deux extrémités, ce moyeu comportant des pales (3a, 3b, 3c ...) et des des moyens (22) stabilisateurs de l'écoulement permettant d'assurer une symétrie de révolution dans la distribution des phases autour de l'axe du moyeu avant la répartition du fluide entre lesdits conduits de sortie.The device according to the invention making it possible to eliminate this drawback is characterized in that it comprises in combination a hub (2) placed coaxially in the tubular body (1) with which it defines an annular space open at its two ends, this hub comprising blades (3a, 3b, 3c ...) and means (22) for stabilizing the flow making it possible to ensure symmetry of revolution in the distribution of the phases around the axis of the hub before the distribution of the fluid between said outlet conduits.

Ce dispositif réalise, en effet, un écoulement stratifié de révolution autour de l'axe du moyeu, cet écoulement étant découpé radialement par les pales. La phase gazeuse est ainsi répartie également entre les différents conduits de sortie, de même que la phase liquide.This device achieves, in effect, a laminated flow of revolution around the axis of the hub, this flow being cut radially by the blades. The gaseous phase is thus evenly distributed between the various outlet conduits, as is the liquid phase.

L'invention pourra être bien comprise et tous ses avantages apparaîtront à la lecture de la description suivante d'un mode particulier de réalisation de l'invention, illustrée par les figures annexées parmi lesquelles:

  • - la figure 1 représente schématiquement une partie du dispositif selon l'invention, vu en coupe axiale,
  • - la figure 2 est la vue de gauche de la figure 1,
  • - la figure 3 est la vue de droite de la figure 1,
  • - les figures 4, 5 et 6 sont des coupes respectivement selon les les lignes IV, V ET VI de la figure 1, qui montrent l'évolution de la forme de la section d'un conduit 4c,
  • - la figure 7 est une vue développée montrant un profil possible des pales 3a, 3b ...
  • - la figure 8 représente un second profil possible des pales 3a, 3b ...
  • - la figure 9 est une vue développée d'une partie du dispositif selon l'invention,
  • - la figure 10 montre une vue schematique du dispositif selon l'invention,
  • - la figure 11 illustre en coupe l'organe stabilisateur, et
  • - la figure 12 est une variante de réalisation de la figure 11.
The invention can be clearly understood and all of its advantages will appear on reading the following description of a particular embodiment of the invention, illustrated by the appended figures among which:
  • FIG. 1 diagrammatically represents part of the device according to the invention, seen in axial section,
  • FIG. 2 is the left view of FIG. 1,
  • FIG. 3 is the right view of FIG. 1,
  • FIGS. 4, 5 and 6 are sections respectively along the lines IV, V AND VI of FIG. 1, which show the evolution of the shape of the section of a conduit 4c,
  • - Figure 7 is a developed view showing a possible profile of the blades 3a, 3b ...
  • - Figure 8 shows a second possible profile of the blades 3a, 3b ...
  • FIG. 9 is a developed view of part of the device according to the invention,
  • FIG. 10 shows a schematic view of the device according to the invention,
  • FIG. 11 illustrates in section the stabilizing member, and
  • FIG. 12 is an alternative embodiment of FIG. 11.

Un mode de réalisation du dispositif selon l'invention est schématiquement représenté en coupe sur la figure 1.An embodiment of the device according to the invention is schematically represented in section in FIG. 1.

Ce dispositif comporte essentiellement un corps tubulaire 1, un moyeu 2, des pales 3a, 3b, 3c ... et un ensemble de canalisations de sortie 4a, 4b, 4c ...This device essentially comprises a tubular body 1, a hub 2, blades 3a, 3b, 3c ... and a set of outlet pipes 4a, 4b, 4c ...

Une des extrémités du corps 1 constitue l'entrée 5 de l'écoulement primaire d'un fluide diphasique à fractionner en plusieurs écoulements secondaires. A cette extrémité, le corps 1 est pourvu de moyens de raccordement, tels qu'une bride de fixation 6 permettant, à l'aide de vis ou boulons schématisés en 7 la fixation étanche du dispositif dans le prolongement d'une conduite 8, dessinée en trait interrompu, dans laquelle l'écoulement primaire de fluide diphasique s'effectue suivant le sens indiqué par les flèches F.One of the ends of the body 1 constitutes the inlet 5 of the primary flow of a two-phase fluid to be divided into several secondary flows. At this end, the body 1 is provided with connection means, such as a fixing flange 6 allowing, by means of screws or bolts shown diagrammatically at 7, the watertight fixing of the device in the extension of a pipe 8, drawn in broken lines, in which the primary flow of two-phase fluid takes place in the direction indicated by the arrows F.

Le moyeu 2, dont le diamètre extérieur est inférieur au diamètre de l'alésage du corps 1 est maintenu coaxialement à l'intérieur de cet alésage avec lequel il délimite un espace annulaire. Lorsque cela s'avère nécessaire, le moyeu 2 est, du côté de l'entrée 5, prolongé par une pièce profilée 9 permettant de réduire au minimum les perturbations de l'écoulement du fluide diphasique primaire, lors de son entrée dans le dispositif. Dans le cas représenté, l'alésage du corps 1 et la surface extérieure du moyeu 2 sont cylindriques et délimitent un espace annulaire dont la section droite est constante, mais on ne sortirait pas du cadre de l'invention si l'une et/ou l'autre de ces surfaces était conique et si, en conséquence, la section droite de l'espace annulaire variait.The hub 2, the outside diameter of which is less than the diameter of the bore of the body 1 is held coaxially inside this bore with which it delimits an annular space. When necessary, the hub 2 is, on the side of the inlet 5, extended by a profiled part 9 making it possible to minimize the disturbances in the flow of the primary two-phase fluid, when it enters the device. In the case shown, the bore of the body 1 and the outer surface of the hub 2 are cylindrical and delimit an annular space whose cross section is constant, but it would not depart from the scope of the invention if one and / or the other of these surfaces was conical and if, consequently, the cross section of the annular space varied.

Des pales, telles que 3a, 3b, 3c et 3d qui sont toutes visibles sur la figure 2 (qui est une vue de gauche de la figure 1 divisent l'espace annulaire compris entre le moyeu 2 et l'alésage du corps 1 en compartiments 10a, 10b, 10c, 10d, sensiblement étanches les uns par rapport aux autres et débouchant aux extrémités du corps 1.Blades, such as 3a, 3b, 3c and 3d which are all visible in FIG. 2 (which is a view on the left of FIG. 1) divide the annular space comprised between the hub 2 and the bore of the body 1 into compartments 10a, 10b, 10c, 10d, substantially tight relative to one another and opening out at the ends of the body 1.

Ces pales, qui peuvent être planes et disposées radialement dans l'espace annulaire délimité par le corps 1 et le moyeu 2, ou qui peuvent être préformées comme il sera indiqué . ultérieurement, sont fixées par tout moyen approprié, tel que soudure, etc ..., soit sur le moyeu 2, soit sur le corps 1, soit encore sur les deux à la fois. Eventuellement, elles peuvent assurer le maintien en position du moyeu 2 à l'intérieur du corps 1.These blades, which can be flat and arranged radially in the annular space delimited by the body 1 and the hub 2, or which can be preformed as will be indicated. subsequently, are fixed by any suitable means, such as welding, etc., either on the hub 2, or on the body 1, or even on both at the same time. Optionally, they can maintain the hub 2 in position inside the body 1.

Le nombre n de pales peut varier en fonction des nécessités. Quatre ont été représentées, à titre d'exemple, sur les figures, mais de façon générale, ce nombre dépend du nombre d'écoulements secondaires que l'on désire obtenir.The number n of blades can vary depending on requirements. Four have been shown, by way of example, in the figures, but in general, this number depends on the number of secondary flows that it is desired to obtain.

L'extrémité du corps 1 opposée à l'entrée 5 (figure 1 ) est obturée par un couvercle 11 fixé sur le corps 1 par exemple par des vis ou des boulons 12 coopérant avec une bride de fixation 13 du corps 1. Ce couvercle peut également assurer le maintien en position du moyeu 2, par exemple, au moyen d'une vis de fixation schématisée en 19. Le couvercle 11 est pourvu d'orifices 14a, 14b, 14c ... en nombre égal au nombre de pales et il est positionné de telle sorte que chaque orifice communique exclusivement avec l'une des compartiments délimité par deux pales consécutives. De préférence, chacun de ces orifices a la forme d'un secteur annulaire de même section que le compartiment avec lequel il communique, cette section étant mesurée selon un plan perpendiculaire à l'axe longitudinal du corps 1. Chaque orifice 14a, 14b ... du couvercle 11 communique exclusivement avec un conduit tel que 4a, 4b, 4c ... fixé sur le couvercle 11. En s'éloignant du couvercle 11, chacun de ces conduits a une section dont la valeur de la surface reste préférence constante mais dont la forme se modifie, comme le montrent les figures 4, 5, 6 qui sont des coupes selon les lignes IV, V et VI de la figure 1.The end of the body 1 opposite the inlet 5 (Figure 1) is closed by a cover 11 fixed to the body 1 for example by screws or bolts 12 cooperating with a fixing flange 13 of the body 1. This cover can also maintain the hub 2 in position, for example, by means of a fixing screw shown diagrammatically at 19. The cover 11 is provided with orifices 14a, 14b, 14c ... in a number equal to the number of blades and it is positioned so that each orifice communicates exclusively with one of the compartments delimited by two consecutive blades. Preferably, each of these orifices has the form of an annular sector of the same section as the compartment with which it communicates, this section being measured along a plane perpendicular to the longitudinal axis of the body 1. Each orifice 14a, 14b .. of the cover 11 communicates exclusively with a conduit such as 4a, 4b, 4c ... fixed on the cover 11. By moving away from the cover 11, each of these conduits has a section whose surface area preferably remains constant but whose shape changes, as shown in Figures 4, 5, 6 which are sections along lines IV, V and VI of Figure 1.

Ces conduits, tous visibles sur la figure 3, qui est une vue de droite de la figure 1, peuvent être raccordés à des canalisations telles que 15, 16, 17 ... représentées en traits interrompus et que le dispositif selon l'invention alimente en fluide diphasique.These conduits, all visible in Figure 3, which is a right view of Figure 1, can be connected to pipes such as 15, 16, 17 ... shown in broken lines and that the device according to the invention supplies in two-phase fluid.

Le fonctionnement du dispositif est simple. En pénétrant dans l'espace annulaire délimité entre le moyeu 2 et le corps 1, l'écoulement primaire de fluide diphasique est divisé en autant d'écoulements diphasiques secondaires qu'il y a de compartiments 10a, 10b, 10c ... et chacun de ces écoulements secondaires est dirigé vers l'une des canalisations d'utilisation 15, 16, 17 ... par l'un des conduits correspondants 4a, 4b, 4c ...The operation of the device is simple. By entering the annular space delimited between the hub 2 and the body 1, the primary flow of two-phase fluid is divided into as many secondary two-phase flows as there are compartments 10a, 10b, 10c ... and each of these secondary flows is directed to one of the use pipes 15, 16, 17 ... by one of the corresponding conduits 4a, 4b, 4c ...

Lorsque l'écoulement primaire à l'entrée 5 du dispositif a une vitesse axiale très grande par rapport à la vitesse de rotation, ou lorsque la vitesse de rotation est sensiblement nulle, les pales 3a, 3b, 3c ... seront avantageusement des pales planes placées radialement et profilées pour ne pas perturber l'écoulement, comme le montre la figure 7 qui est une vue développée du moyeu 2 portant les pales.When the primary flow at the inlet 5 of the device has a very high axial speed relative to the speed of rotation, or when the speed of rotation is substantially zero, the blades 3a, 3b, 3c ... will advantageously be blades planes placed radially and profiled so as not to disturb the flow, as shown in FIG. 7 which is a developed view of the hub 2 carrying the blades.

Lorsque la vitesse V de l'écoulement du fluide diphasique à l'entrée du dispositif a une composante axiale Vx et une composante rotationnelle Q (vitesse de giration mesurée en radian/seconde), le profil de chaque pale pourra ou non être gauchi pour que, en tout point du bord d'attaque, l'angle a d'inclinaison de la pale (fig. 8) satisfasse à la relation

Figure imgb0001
R étant la distance du point considère à l'axe du dispositif.When the speed V of the flow of the two-phase fluid at the input of the device has an axial component V x and a rotational component Q (rate of turn measured in radian / second), the profile of each blade may or may not be warped to that at any point on the leading edge, the angle of inclination of the blade (fig. 8) satisfies the relation
Figure imgb0001
 R being the distance from the point considered to the axis of the device.

Eventuellement, comme le montre la figure 9, les pales pourront avoir un profil dont le rayon de courbure décroît de l'entrée vers la sortie. Les canalisations 4a, 4b, 4c et 4d pourront être préformées pour que leurs axes au niveau du couvercle 11 soient sensiblement parallèles à l'angle que forment les pales avec l'axe du dispositif.Optionally, as shown in Figure 9, the blades may have a profile whose radius of curvature decreases from the inlet to the outlet. The pipes 4a, 4b, 4c and 4d may be preformed so that their axes at the level of the cover 11 are substantially parallel to the angle formed by the blades with the axis of the device.

Le dispositif illustré par les figures 1 à 9 permet de transformer un écoulement primaire diphasique en plusieurs écoulements secondaires qui auront une teneur en gaz libre peu différente de celle de l'écoulement primaire, lorsque la distribution des phases a une symétrie de révolution autour de l'axe de l'écoulement primaire à l'entrée du corps 1. Dans tous les autres cas, les teneurs en gaz libre des écoulements secondaires seront différentes.The device illustrated in FIGS. 1 to 9 makes it possible to transform a two-phase primary flow into several secondary flows which will have a free gas content little different from that of the primary flow, when the distribution of the phases has a symmetry of revolution around l 'axis of the primary flow at the inlet of the body 1. In all other cases, the free gas contents of the secondary flows will be different.

Il est possible d'éviter cet inconvénient en utilisant un ensemble de stabilisation de la distribution des phases de l'écoulement primaire qui, sur la figure 10, est indiqué par la référence 20. Cet ensemble comporte essentiellement une tubulure d'admission 21, un élément stabilisateur 22 et éventuellement un organe 23 adapté à augmenter la pression du fluide diphasique avant son introduction dans le corps 1.It is possible to avoid this drawback by using a set for stabilizing the distribution of the phases of the primary flow which, in FIG. 10, is indicated by the reference 20. This assembly essentially comprises an intake manifold 21, a stabilizing element 22 and possibly a member 23 adapted to increase the pressure of the two-phase fluid before its introduction into the body 1.

Dans l'exemple représenté, la tubulure d'admission 21 est une tubulure coudée selon un rayon de courbure de grande dimension, afin de ne pas introduire de perte de charge importante dans l'écoulement primaire.In the example shown, the intake manifold 21 is a manifold bent along a large radius of curvature, so as not to introduce a significant pressure drop in the primary flow.

L'organe stabilisateur 22 peut être de tout type connu et a pour but de maintenir sensiblement constante la teneur en gaz libre dans l'écoulement primaire, ou au moins d'empêcher que cette teneur ne subisse des variations rapides.The stabilizing member 22 can be of any known type and is intended to keep the content of free gas in the primary flow substantially constant, or at least to prevent this content from undergoing rapid variations.

A titre d'exemple, cet organe stabilisateur pourra être du type pompe hélico-axiale, telle que l'organe de pompage pour fluide diphasique décrit dans la demande de brevet français FR-A N° 2 333 139. Brièvement, et comme on peut le voir sur la figure 11, cet organe stabilisateur comporte une pluralité de moyeux 24 solidaires en rotation d'un arbre 28 entraîné par un moteur 32 (figure 10) dont la vitesse de rotation est de préférence adjustable de façon continue. Chacun des moyeux 24 porte des pales 25 dont le rayon de courbure ainsi que l'angle formé par l'axe de rotation et la tangente au profil de chaque pale décroissent dans le sens d'écoulement du fluide diphasique. Entre les différents étages sont intercalés des redresseurs comportant des pales 26 solidaires du carter 33 du stabilisateur 22 et qui sont également solidaires d'un moyeu 27 de forme tubulaire. L'arbre 25 traverse tous les moyeux 27 dont certains au moins constituent également des paliers de roulement de l'arbre 28 avec, si nécessaire, interposition de roulements à billes (non représentés sur les dessins).By way of example, this stabilizing member could be of the helical-axial pump type, such as the pumping member for two-phase fluid described in French patent application FR-A No. 2,333,139. Briefly, and as can be see in Figure 11, this stabilizer member comprises a plurality of hubs 24 integral in rotation with a shaft 28 driven by a motor 32 (Figure 10) whose speed of rotation is preferably continuously adjustable. Each of the hubs 24 carries blades 25 whose radius of curvature as well as the angle formed by the axis of rotation and the tangent to the profile of each blade decrease in the direction of flow of the two-phase fluid. Between the different stages are inserted rectifiers comprising blades 26 integral with the housing 33 of the stabilizer 22 and which are also integral with a hub 27 of tubular shape. The shaft 25 passes through all the hubs 27, at least some of which also constitute rolling bearings of the shaft 28 with, if necessary, interposition of ball bearings (not shown in the drawings).

Entre l'organe stabilisateur 22 et l'entrée du dispositif est interposé un organe de pompage 23 dont le but est d'augmenter la pression du fluide diphasique après stabilisation, pour compenser les pertes de charge.Between the stabilizing member 22 and the inlet of the device is interposed a pumping member 23 whose purpose is to increase the pressure of the two-phase fluid after stabilization, to compensate for the pressure losses.

Cet organe de pompage comporte un moyeu 29 qui porte des pales 30 dont le profil, adapté à augmenter la pression du fluide diphasique, est du type de celui décrit dans la demande de brevet français citée plus haut. Ce moyeu 29 est entraîné en rotation par un arbre moteur qui dans le cas illustré par la figure 11 est l'arbre 28 mais peut également être un arbre différent 31 entraîné par un second moteur non représenté, pouvant avoir une vitesse variable.This pumping member comprises a hub 29 which carries blades 30 whose profile, adapted to increase the pressure of the two-phase fluid, is of the type described in the French patent application cited above. This hub 29 is rotated by a drive shaft which in the case illustrated in FIG. 11 is the shaft 28 but can also be a different shaft 31 driven by a second motor, not shown, which can have a variable speed.

Pendant le fonctionnement, la vitesse de rotation du ou des arbres moteurs est ajustée pour obtenir les meilleurs résultats, en fonction des conditions d'écoulement du fluide diphasique.During operation, the speed of rotation of the motor shaft (s) is adjusted to obtain the best results, depending on the flow conditions of the two-phase fluid.

Des modifications pourront être apportées sans pour autant sortir du cadre de la présente invention. Par exemple, la répartition des pales 3a, 3b, 3c ... sur le moyeu 2 pourra être faite en fonction du débit relatif de chaque écoulement secondaire par rapport à l'écoulement primaire. Ainsi, ces pales peuvent être régulièrement réparties lorsque les écoulements secondaires ont même débit, mais l'écartement angulaire entre deux pales consécutives peut être augmenté pour obtenir un débit plus important de l'écoulement secondaire qu'elles délimitent, ou diminué dans le cas contraire.Modifications may be made without departing from the scope of the present invention. For example, the distribution of the blades 3a, 3b, 3c ... on the hub 2 can be made as a function of the relative flow rate of each secondary flow with respect to the primary flow. Thus, these blades can be evenly distributed when the secondary flows have the same flow, but the angular spacing between two consecutive blades can be increased to obtain a greater flow of the secondary flow that they delimit, or decreased in the opposite case. .

Claims (12)

1. An apparatus for converting a primary flow of a two-phase fluid into a plurality of secondary- flows of two-phase fluid, comprising a tubular body (1), a plurality of radial partitioning walls (3a, 3b, 3c ...) disposed in the tubular body (1) which they divide into as many compartments (10a, 10b, 10c ...) which are separate from each other and whose sections perpendicular to the axis of the tubular body (1) are in the shape of an annular section, said compartments (10a, 10b, 10c ...) opening at the ends of the tubular body (1), and a plurality of outlet conduits (4a, 4b, 4c ...) which are disposed at the same side of one of the ends of the tubular body (1), each of said conduits (4a, 4b, 4c ...) communicating exclusively with one of the compartments (10a, 10b, 10c ...), characterised in that it comprises in combination a hub means (2) which is placed coaxially in the tubular body (1) with which it defines an annular space open at its two ends, said hub means comprising blades (3a, 3b, 3c ...) forming said radial partitioning walls, and flow stabilising means (22) for ensuring rotational symmetry in the distribution of the phases about the axis of the hub means (2) before distribution of the fluid among said outlet conduits (4a, 4b, 4c ...).
2. An apparatus according to claim 1 characterised in that said outlet conduits (4a, 4b, 4c ...) are fixed with respect to a cover (11) which fits to the end of the tubular body (1), the commmunication between the compartments (10a, 10b, 10c ...) and the outlet conduits (4a, 4b, 4c) being provided by openings (14a, 14b, 14c ...) provided in the cover (11).
3. An apparatus according to claim 2 characterised in that the cross-section of an outlet conduit (4a, 4b, 4c ...) at the level of the cover (11) is substantially identical to the cross-section of the compartment (1 Oa, 10b, 10c ...) with which it communicates.
4. An apparatus according to claim 3 characterised in that the section of the outlet conduit (4a, 4b, 4c ...) is modified so as to become circular when moving away from the cover (11).
5. An apparatus according to claim 1 characterised in that said blades (3a, 3b, 3c ...) are regularly distributed in the annular space.
6. An apparatus according to claim 1 characterised in that the blades (3a, 3b, 3c ...) are planar.
7. An apparatus according to claim 1 characterised in that the blades (3a, 3b, 3c ...) are of a profile of which the radius of curvature (Figure 9) decreases in the direction of the flow of two-phase fluid within the tubular body (1).
8. An apparatus according to claim 7 characterised in that the tangent to the profile of a blade (3a, 3b, 3c ...) forms an angle to the axis of the tubular body (1), which decreases in the direction of flow of the two-phase fluid.
9. An apparatus according to one of the preceding claims characterised in that the stabilising means (22) are fixed to the tubular body (1) on the opposite side to the outlet conduits (4a, 4b, 4c ...).
10. An apparatus according to claim 9 characterised in that it comprises a means (23) adapted to increase substantially the pressure of the two-phase fluid of the primary flow, said means (23) being interposed between the stabilising means (22) and the tubular body (1).
11. An apparatus according to claim 9 characterised in that the stabilising means (22) are of the pump type for two-phase fluid.
12. An apparatus according to claim 10 characterised in that the pressure-increasing means (23) is a helico-axial pump for two-phase fluid.
EP19790400026 1978-01-16 1979-01-12 System for transforming a two-phase primary flow into several secondary flows Expired EP0003202B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7801316 1978-01-16
FR7801316A FR2414651A1 (en) 1978-01-16 1978-01-16 DEVICE FOR TRANSFORMING A DIPHASIC PRIMARY FLOW INTO SEVERAL SECONDARY DIPHASIC FLOWS

Publications (3)

Publication Number Publication Date
EP0003202A2 EP0003202A2 (en) 1979-07-25
EP0003202A3 EP0003202A3 (en) 1979-08-08
EP0003202B1 true EP0003202B1 (en) 1981-10-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790400026 Expired EP0003202B1 (en) 1978-01-16 1979-01-12 System for transforming a two-phase primary flow into several secondary flows

Country Status (3)

Country Link
EP (1) EP0003202B1 (en)
DE (1) DE2961089D1 (en)
FR (1) FR2414651A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US7261120B2 (en) 2003-06-24 2007-08-28 Morten Muller Ltd. Aps Device for splitting a two-phase stream into two or more streams with the desired vapor/liquid ratios

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Publication number Priority date Publication date Assignee Title
DE3039384A1 (en) * 1980-10-18 1982-05-19 Ruhrkohle Ag DEVICE FOR BLOWING (ALPHA) -HALBHYDRATE AND / OR (BETA) -HALBHYDRATE
AU2012202150B1 (en) 2012-04-13 2013-07-11 Process Development Centre Pty Ltd. A flow distributor

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FR617616A (en) * 1926-06-16 1927-02-23 Cie Des Surchauffeurs Assembly method, at the end, of a single tube with a series of tubes
CH150064A (en) * 1930-09-12 1931-10-15 Krauss Richard Y-pipe seal at the connection point to a fully cylindrical pipe, especially high-pressure water pipe.
NL82646C (en) * 1947-11-07
DE800713C (en) * 1948-10-02 1950-11-30 Babcock & Wilcox Dampfkessel W Pipe distributor
DE800173C (en) 1949-01-01 1950-10-12 Knorr Bremse Gmbh Air brakes for locomotives
GB971405A (en) * 1962-10-19 1964-09-30 Ford Motor Co Motor vehicle exhaust systems
US3504709A (en) * 1965-10-07 1970-04-07 Gen Motors Corp Branched conduit
FR2280017A1 (en) * 1974-04-26 1976-02-20 Creusot Loire DEVICE FOR DISTRIBUTING A FLUID CURRENT INTO SEVERAL FLOWS
FR2333139A1 (en) 1975-11-27 1977-06-24 Inst Francais Du Petrole Two-phase fluid axial flow type pump - with specified spiral blade configuration for cavitation prevention (NL 1.6.77)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7261120B2 (en) 2003-06-24 2007-08-28 Morten Muller Ltd. Aps Device for splitting a two-phase stream into two or more streams with the desired vapor/liquid ratios

Also Published As

Publication number Publication date
DE2961089D1 (en) 1982-01-07
FR2414651A1 (en) 1979-08-10
FR2414651B1 (en) 1980-05-16
EP0003202A3 (en) 1979-08-08
EP0003202A2 (en) 1979-07-25

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