Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
  • B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
  • B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
  • B01D21/26—Separation of sediment aided by centrifugal force or centripetal force
  • B01D21/265—Separation of sediment aided by centrifugal force or centripetal force by using a vortex inducer or vortex guide, e.g. coil

Definitions

• the present invention relates to centrifugal separators in which the fluid to be treated flows in a pipe comprising several successive bends alternately oriented in one direction and in the other, the heavy particles, or respectively light, concentrating against the outer wall, respectively inside, of each elbow, and being collected by appropriate collecting devices provided towards the downstream end thereof.
• partitions have been placed in the elbows which divide the pipe into several elementary channels of small width in which the separation takes place more effectively.
• the solutions proposed to date have not been entirely satisfactory.
• 1 ° dividing partitions are provided in all the successive elbows of the pipe and the downstream ends of the partitions of an elbow, except the last, are nested with the upstream ends of the partitions of the following elbow so that the outgoing fluid of at least some of the elementary canals of one elbow is divided into two fractions in the next elbow.
• each bend the partitions are arranged concentrically with respect to each other and with respect to the walls of the bend considered.
• Fig. 1 is a plan view with section of a centrifugal separator according to the invention.
• Fig. 2 is a view reproducing on a larger scale a detail of FIG. 1, namely the right part of the downstream end of the second bend of the separator.
• Fig. 3 is a section along III-III (fig. 2), this view indicating in II-II the section plane which corresponds to fig. 2.
• Fig. 4 to 6 very schematically indicate variants of the separator of FIG. 1.
• Fig. 7 is a partial section showing an arrangement in which the main partitions of the successive elbows do not engage with one another.
• the centrifugal separator indicated in section in fig. 1 is provided for separating heavy particles from a fluid which is supposed to be constituted by a gas.
• This separator comprises a rectilinear inlet pipe 1, a first bend 2 corresponding to an arc of a circle of approximately 225 ° in the direction dextrorsum in the figure, then a second bend 3 similar to the previous one, but oriented in the opposite direction, and finally a rectilinear outlet pipe 4 which extends parallel to the inlet pipe 1. It will be assumed that the pipes and the elbows are of rectangular section.
• Each elbow is divided by two main partitions 2a, 2b, respectively 3a, 3b, into three concentric channels 2ç, 2d, 2e, respectively 3c, 3d and 3e, it being noted that the innermost channels 2e, 3e have a width less than that of the other two 2c, 2d, respectively 3c, 3d. It is understood that with such an arrangement the two downstream end edges of the partitions 2a, 2b are located substantially at a fraction of the width of the inlet of the channels 3c, 3d of the bend
• each of the three channels there is provided on the internal wall of each of the three channels thereof a suitably profiled boss so as to ensure the establishment of the irrotational flow regime in the channel concerned.
• a suitably profiled boss so as to ensure the establishment of the irrotational flow regime in the channel concerned.
• a first profiled boss 2f on the outer face of the upstream end of the partition 2a, another 2g on that of the partition 2b and finally a third 2h on the internal wall of the elbow 2.
• the downstream end of the elbow 2 has on the internal face from the outer wall of each channel, a device for collecting heavy particles constituted by an auxiliary partition 2i, 2j, 2k delimiting a collecting space which communicates with a collecting chamber situated below the lower wall of the elbow, as will be recalled in more detail below.
• the auxiliary partitions have a profile similar to that of the bosses 2f, 2g, 2h, so as to maintain the irrotational flow regime in the channels 2ç_, 2d_, 2e_.
• Fig. 2 and 3 show how the auxiliary partitions and the elements associated with them are established. It can be seen that the upstream edge or edge of each partition is fixed to a round baluster 5 mounted in the channel in question a short distance from its outer wall.
• This partition has an airplane wing profile and its downstream end is connected to the aforementioned wall (partition 3a or external wall of the elbow 3 in FIG. 2).
• the space thus delimited communicates through a grid 6, respectively 7, with a lower collecting chamber 8, which can be of any suitable type (the grids 6 and 7 are moreover not compulsory).
• the chamber in question can in particular be produced in the form of a hopper connected by a pipe to a filter or cyclone which makes it possible to extract the particles from a low flow rate of gas ensuring their transport.
• the gas charged with particles arrives by the rectilinear pipeline 1.
• the partitions 2a and 2b distribute it in the three channels 2c, 2d, 2e inside which it turns regularly according to the regime of irrotational flow thanks to the presence of bosses 2f, 2g, 2h and profiled auxiliary partitions 2i, 2j, 2k.
• bosses 2f, 2g, 2h and profiled auxiliary partitions 2i, 2j, 2k During the rotation inside the bend 2, the heavy particles tend to concentrate against the external face of the walls of the channels. A high proportion of them therefore passes into the collecting spaces delimited by the auxiliary partitions 2i, 2 d, 2 k and thus falls back into the lower collecting chambers from where they can be evacuated with a low gas flow.
• the lightly charged gas stream which circulated against the inner wall of the channel is brought against the inner wall of the corresponding channel, respectively 3d, 3c of the elbow 3.
• the charge gas stream flowing against the outer wall of the channels 2d, 2 e passes against the outer wall of the corresponding channels 3d, 3ç.
• the channels 3c and 3d receive the charged current against their outer wall and the lightly charged current against their inner wall, which avoids any phenomenon of mixing and resuspension of the particles at the inlet of the elbow 3.
• the narrow channel 3e receives from the channel 2c only the charged current flowing against the outer wall thereof, which also contributes to facilitating its functions as a centrifugal separator.
• the profiling of the bosses 2f, 2g, 2h and of the auxiliary partitions 2i 2j, 2k, 3i, 3j, 3k, as well as of the ends 3f, 3g and of the auxiliary partitions ensures the establishment and / or maintenance of the regime of The irrotational flow in the channels, which again prevents the formation of vortices and guarantees the best conditions for centrifugal separation.
• the two collecting chambers such as 8 can communicate with each other.
• Fig. 4 to 6 very schematically indicate variations in the arrangement of the elbows.
• the locations with profiled bosses or auxiliary partitions arranged in the above-exposed manner have been indicated by rectangles.
• the first bend here referenced 11, comprises three main partitions 11a, 11b lie (and no longer only two as in fig. 1), each fitted with an auxiliary partition 11d, lie, 11f (to which a fourth 11g provided is added. on the outer wall of the elbow).
• the second bend 12 also has three main partitions 12a, 12b, 12c, but these only start in the transverse plane of the terminal edges of the previous ones and each has a profiled entry boss, respectively 12d, 12e, 12f (more here also a fourth 12g, on the outer wall of the elbow considered). It is understood that the operation remains the same as that described above.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Separating Particles In Gases By Inertia (AREA)
• Centrifugal Separators (AREA)
• Cyclones (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9224029

Family Applications (1)

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• 1979
  • 1979-04-02 FR FR7908700A patent/FR2452954A1/fr active Granted
• 1980
  • 1980-04-01 BR BR8007870A patent/BR8007870A/pt unknown
  • 1980-04-01 JP JP50079080A patent/JPS56500286A/ja active Pending
  • 1980-04-01 WO PCT/FR1980/000050 patent/WO1980002114A1/fr not_active Ceased
  • 1980-07-24 IN IN850/CAL/80A patent/IN154350B/en unknown
  • 1980-10-23 EP EP19800900574 patent/EP0026185A1/fr not_active Withdrawn

Non-Patent Citations (1)

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