Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
  • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps

Definitions

• Gaseous fluid compressor associated with a gas-liquid separator.
• the invention relates to a gaseous fluid compressor which is associated with a gas-liquid separator placed upstream of the compressor to receive a mixture of gas and liquid, separate the liquid from the gas and supply the compressor only with gaseous fluid.
• 3,104,964 discloses a gas-liquid separator which comprises a blade wheel placed at the inlet of the compressor.
• the liquid droplets entrained by the gas are separated from the gas by impact on the blades of this wheel and are ' centrifuged radially inside the blade wheel towards the outer fairing of the latter, then led to a groove of weak depth.
• the object of the invention is in particular to avoid these various drawbacks.
• a gaseous fluid compressor associated with a centrifugal gas-liquid separator which " is placed at the inlet of the compressor, inside the casing thereof, to supply it essentially with gaseous fluid and which comprises a blade wheel rotated by the compressor shaft, characterized in that it comprises, upstream of said blade wheel, fixed curved fins for rotating the gas-liquid mixture; and in that said wheel blades includes blades or blades at its upstream and downstream ends by which it is integral with an elongated tubular outer shell inside which the gas-liquid separation is effected by centrifugation.
• the gas-liquid mixture is rotated inside the tubular envelope, and the liquid is separated by centrifugation of the gas, which allows to separate droplets of liquid having a size very small, of the order of 5 mm for example.
• the separator-compressor assembly is in an integrated and compact form and is easy to install, the size of the centrifuge device being no greater than that of the compressor itself.
• a liquid collection chamber is associated with the centrifugation device and comprises means for withdrawing liquid.
• This collection chamber can be located either at the upstream end of the centrifuge device, or at its downstream end, or in between.
• the liquid withdrawal means can comprise a fixed impeller, of the centripe turbine wheel type which is supplied with liquid by the collection chamber and which is connected to a liquid passage opening out of the compressor casing.
• the liquid withdrawal means may comprise a fixed profiled scoop, of the Pitot tube type, connected to a liquid passage opening out of the compressor casing.
• the liquid sampling means may also comprise, or be constituted by nozzles carried by the peripheral surface of the collection chamber and which open out of this chamber into a fixed diffuser mounted in the casing of the compressor.
• the separator-compressor assembly according to the invention can comprise a radial gas supply with a gas-liquid mixture and then comprises a supply volute comprising fixed distribution fins and fixed fins for rotating the gas-liquid mixture. .
• the whole can be axially powered, by means of a ç ⁇ r uit comprising a fixed central core housing bearings and seals cooperating with the compressor shaft and connected to a tubular casing by curved blades for rotating the mixture gas-liquid.
• a ç ⁇ r uit comprising a fixed central core housing bearings and seals cooperating with the compressor shaft and connected to a tubular casing by curved blades for rotating the mixture gas-liquid.
• the invention is applicable in particular to a high power compressor, for example a compressor of about 12 megawatts used for the compression, in a ratio 2, of a flow of natural gas of the order of 10'm3 standard per day , may contain up to 50% by mass of liquid.
• FIG. 1 is a schematic half-view in axial section of a separator-compressor assembly according to the invention
• - Figure 2 is a partial view developed flat showing both the arrangements of fins and blades of the separator-compressor assembly according to the invention
• FIG. 3 is a schematic half-view in axial section of another embodiment of a separator-compressor assembly according to the invention.
• FIG. 4 is a partial view developed in a flat view representing the arrangement of the fins and blades of a part of the assembly of FIG. 3.
• FIGS. 1 and 2 showing a first embodiment of a separator-compres assembly according to the invention.
• the compressor shown in FIG. 1 is a two-stage centrifugal compressor, comprising two impellers 10 and 12 integral with a shaft 14 for driving in rotation and mounted in a casing 16 of conventional type.
• the front part 18 of the casing 16 contains a gas-liquid separator, constituted by a centrifuge device comprising a impeller 20 with blades, which is for example integral in rotation with the wheel 10 of the first stage of the compressor, and which is constituted by an internal cylindrical ring 22 and an external tubular ring 24 connected together, at the upstream end of the device, by planar vanes 26 parallel to the axis of rotation and, at the downstream end of the device, by planar blades 28 who are angu-
• a gas-liquid separator constituted by a centrifuge device comprising a impeller 20 with blades, which is for example integral in rotation with the wheel 10 of the first stage of the compressor, and which is constituted by an internal cylindrical ring 22 and an external tubular ring 24 connected together, at the upstream end of the device, by planar vanes 26 parallel to the axis of rotation and, at the downstream end of the device, by planar blades 28 who are angu-
• the outer ring 24 constitutes the outer casing of the centrifu ⁇ gation device and comprises for example, at its downstream end, an annular flange 30 by which it can be fixed
• This outer ring 24 is slightly frustoconical in shape and widens in the direction of the input wheel 10 25 of the compressor. Chabrage of the internal surface of the ring 24, at its downstream end, forms a chamber 34 for collecting liquid which contains means for taking liquid.
• these means can be constituted, as shown in FIG. 1, by a fixed profiled scoop 36, of the Pitot tube type, the radially outer end of which is located in collection chamber 34 and the end of which
• the housing of the separator-compressor assembly can be axially supplied with a gas-liquid mixture, as shown in FIG. 1, and is associated in this case with a fixed supply duct comprising an axial housing 42 and a central core. 44 which surrounds the upstream end of the shaft d. "Drive 14 and makes it possible to house the bearings and garni ⁇ tures of sealing sealing cooperating with this end of the shaft 14.
• the casing 42 and the central core 44 are connected by curved fins 46 carrying out a rotation of the gas-liquid mixture corresponding to the direction of rotation of the centrifuge device indicated by the arrow 40 in FIG. 2.
• the liquid outlet conduit 38 is extended upstream 2 Q to the central core 44 and passes radially through the supply conduit to terminate outside of the latter.
• the gas-liquid mixture flowing in the casing 42 undergoes a deflection when it meets the central core 44 of the supply duct. This deviation makes it possible to recover, on the internal wall of the casing 42, the largest droplets of liquid which will progress over this
• the gas-liquid mixture circulating in the supply line is rotated around the axis of the shaft 14 by the curved fins 46, which transform the flow substantially axial of the gas-liquid mixture in a helical flow, which is taken up by the paddle wheel 20 of the centrifuge device.
• the liquid droplets are separated from the gas by centrifugal effect and progress inside the envelope 24 towards the collection chamber 34, where the liquid is taken up by the scoop 36 and directed outward through the conduit 38.
• the relative movement of the gas relative to this 0 bladed wheel is an axial flow towards the inlet wheel 10 of the compressor .
• this other embodiment differs from that of FIGS. 1 and 2 in that the assembly comprises a radial conduit for supplying a gas-liquid mixture, in that the collection chamber and the sampling means liquid are located at the upstream end of the separator and in that the compressor comprises three centrifugal stages,
• the separator-compressor assembly 25 comprises a casing 50, the ends of which are respectively connected to a radial duct 52 for supplying gas-liquid mixture and to a radial duct 54 for the outlet of compressed gas.
• the radial supply duct 52 opens into a volute 56 comprising, at its upstream end, 30 fixed fins 58 for distribution and, at its downstream end, fins. fixed 60 for rotating the gas-liquid mixture.
• the volute 56 opens into a chamber 62 for collecting liquid 35, situated between the downstream end of the volute 56 and the upstream end of the gas-liquid separator.
• This collection chamber 62 contains means for withdrawing liquid, which in this example consist of a fixed wheel 64 with blades, of the centripetal turbine wheel type, the inlet of which is in the immediate vicinity of the peripheral wall of the collection chamber 62, and the outlet of which is connected to a volute 66 housed inside the casing 50 and terminating on the outside thereof.
• the external tubular envelope 74 widens in the direction of the collection chamber 62.
• the vanes 76 at the inlet of the centrifuge device are curved so as to participate in the rotation around the axis of the shaft 72 of the gas-liquid mixture, while the blades 78 at the outlet of the device are straight and parallel to the axis of rotation, being angularly aligned with the upstream ends of the vanes 80 of the input wheel 82 of the compressor.
• this compressor has three stages and therefore comprises two other impellers 84 and 86 respectively, the three wheels rotating inside stators carried by the casing 50.
• the outlet volutes of the first two stages of the compressor can be formed with calibrated orifices 88 passing through their peripheral wall and forming outlet nozzles for the liquid which would not have been completely separated from the gas. by the centrifugation device.
• Sets of bearings and seals cooperating with the drive shaft 72 are supported by the supply volute 56 on the one hand and by the right end of the housing 50, on the other hand.
• FIGS. 3 and 4 works in the following way:
• the gas-liquid mixture supplied by the radial duct 52 Q enters the supply volute 56, passes over the distributing fins 58 and over the fins 60 which cause the mixture to rotate. This rotation is accentuated by the inlet vanes 76 of the centrifuge device, which is rotated by the shaft
• the wheel 64 of the centripetal turbine wheel type, makes it possible to recover approximately 40% of the kinetic energy of the liquid withdrawn and to transform this energy into pressure energy to drive the liquid to outside the compressor housing without the need to use a pump.
• the very fine droplets of liquid which can still be transported by the gas, are discharged through the calibrated orifices 88 of the outlet volute of the first stage of the compressor and, possibly, through those of the outlet volute of the second stage.
• the outgoing liquid through the calibrated orifices 88 is recovered in a fixed diffuser and, if necessary, returned to the supply volute 56.
• a separator-compressor assembly according to the invention can operate under the following conditions:
• - diameter of the compressor wheels from 170 to 500 mm approximately, depending on the case.
• - outside diameter of the bladed wheel of the centrifuge device approximately 70% of the diameter of the compressor wheels
• - length of the paddle wheel from 300 to 600 mm approximately (for a flow rate of approximately 12,000 m3 / hour)
• all the liquid droplets having a diameter greater than 7 microns being separated from the gas over a length of 300 mm approximately ' in the centrifuge.
• the dimensions of the collection chamber and of the sampling means are determined for a maximum proportion of liquid capable of being contained in the gas-liquid mixture.
• the invention can be used not only for compressing a very high flow rate of natural gas, but also in refineries, in steam treatment plants, as well as in supply systems for special fuels such as those used. in aeronautics and which have saturated vapor pressures such that a mass boiling can occur from a certain altitude.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Centrifugal Separators (AREA)

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ID=9324654

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Family Cites Families (5)

• 1985
  • 1985-11-08 FR FR8516598A patent/FR2589957B1/fr not_active Expired
• 1986
  • 1986-11-06 WO PCT/FR1986/000377 patent/WO1987003051A1/fr unknown
  • 1986-11-06 EP EP19860906356 patent/EP0246261A1/de active Pending

Non-Patent Citations (1)

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