FR2608940A1 - PROCESS FOR SEPARATING LIQUID PHASE SUSPENSIONS AND SOLID PARTICLES AND DEVICE FOR IMPLEMENTING SAME - Google Patents

Abstract

THE PROCESS FOR SEPARATING SUSPENSIONS IN LIQUID PHASE AND IN SOLID PARTICLES CONSISTS OF PUTTING THE SUSPENSIONS IN A PERFORATED VIROLE 1. TO CHANGE THE LIQUID PHASE THROUGH PERFORATED VIROLE 1, THE SUSPENSION IS SUBJECT TO THE ACTION OF QU 'CENTRIES IT IS CREATED BY INTRODUCING A GAS INTO VIROLE 1 AND PUTTING IT IN A VIRTUAL MOTION. THE DEVICE IMPLEMENTING THIS PROCESS INCLUDES A BODY 2 EQUIPPED WITH A LIQUID PHASE 11 DISCHARGE TUBING. THE PERFORATED VIROLE, PROVIDED WITH A SUSPENSION INLET TUBING 5 AND WITH A PARTICLE DISCHARGE TUBING 4 SOLIDS IS MOUNTED IN THE BODY 2. A TUBING 9 IS ALSO PROVIDED TO DELIVER GAS TO THE INSIDE OF THE VIROLE 1 WITH A MEANS 17 FOR WHIRLING GAS AND A TUBING 12 IS INTENDED TO EVACUATE THE GAS. THIS PROCESS AND THIS DEVICE ENSURE THE TOTAL SEPARATION OF THE LIQUID PHASE FROM THE SOLID PARTICLES WITH REDUCED ENERGY CONSUMPTION AND OVERALL DIMENSIONS OF THE DEVICE.

Description

The present invention relates to the separation of liquid fluids and to

  especially for objects a method of separating suspensions of liquid phase particles

  solids and a device for its implementation.

  The present invention may be advantageously applied to the separation of suspensions containing solid particles of polymers in the liquid phase and where these

solid particles.

  The method for separating the suspensions in the liquid phase and in solid particles and the device for carrying out this process produced according to the present invention can also be used for the separation of the liquid phase from different solid particles during the production of mineral fertilizers, synthetic fibers

  as well as in other branches of industry.

  The present invention can also be used successfully for the drying of solid particles, for their heating or cooling as well as for different

technological processes.

  A process for the separation of suspensions in the liquid phase and in solid particles is known (see, for example, the USSR author's certificate n ° 538729 "Filter-thickener" Cl Int, BO1 D 29/10, BOl D 17/10) according to which provision is made for bringing the suspension to a

perforated ferrule fixed.

  The suspension is introduced into the perforated ferrule

  tangentially to the surface of the perforated ferrule.

  As a result, the suspension is rotated.

  This rotation generates centrifugal forces which cause the liquid phase to pass through the perforated ferrule outwards. The solid particles move by gravity along the perforated ferrule and are discharged therefrom.

  During the implementation of the known separation process

  In the liquid phase and in solid particles, the liquid phase is separated from the solid particles by the centrifugal forces generated by the rotation of the suspension. However, the rotation of the suspension weakens rather quickly depending on the height of the

  perforated ferrule because the energy of the suspension current

  It is usually weak and the force of friction against the wall of the perforated shell is quite large. As a result, the liquid phase is separated from the solid particles in the lower part of the shell essentially by gravity. As a result, a portion of the liquid phase is evacuated as a result of the surface tension forces together with solid particles. In this case, however, the humidity of the solid particles discharged remains high. In addition, during the implementation of the known method for separating suspensions in the liquid phase and in solid particles, the suspension, separated from the portion of the liquid phase, moves along the inner surface of the perforated shell forming an even layer. as a result, the solid particles do not move

  in this layer relative to each other.

  The liquid phase lying between the solid particles inside said layer is removed from the perforated shell together with the solid particles, which causes the solid particles to remain very wet, ie the liquid phase is not separated

totally solid particles.

  This phenomenon is sometimes undesirable, especially in cases where the separation of the suspension in the liquid phase and in solid particles is aimed at obtaining solid particles of minimum humidity and is a final operation.

of manufacturing a finished product.

  There is a device for separating suspen-

  for the implementation of the known process (cf.

  example, also an author's certificate of the U.R.S.S.

  No. 538,729, Cl, Int, BO1 D 29/10, BO1 D 17/10) having a body provided with a tubing for the evacuation of the

liquid phase.

  A perforated ferrule is mounted in said body in its lower part at a distance from its walls. A tubing for supplying the suspension to an upper end of the perforated shell and a tubing for the evacuation of solid particles is also provided.

  from the other lower end, perforated ferrule.

  The perforated ferrule is made in the form of a truncated cone, the large base of which is oriented upwards, where the supply pipe of the suspension is mounted and is

  placed in the body so that their longitudinal axes

  coincide. The solid particles evacuation pipe is joined to the smaller, lower base of the

  truncated cone of the perforated ferrule.

  A conical hood is mounted inside the body,

  at its upper part, coaxially to the perforated shell.

  Its large lower base is oriented towards the perforated shell. An annular slot is provided between the body and the hood for the passage of the suspension. The hood is designed to regularly distribute the swirling current

  suspension, coming from the suspension supply line

  according to the inner surface of the perforated ferrule.

  The suspension feed tubing is disposed tangentially to the surface of the perforated ferrule and is located at approximately the middle of the

bonnet height arq-n.

  As already noted above in the description of

  the known method for separating suspensions in the liquid phase and in solid particles, the known device does not ensure the total separation of the solid phase from

solid particles.

  It was therefore proposed to develop a method

  separation of suspensions in the liquid phase and in particular

  solid means according to which the centrifugal forces are created so as to allow the separation of the liquid phase of the solid particles and a device for the implementation of this method to be sufficiently complete. The problem is solved by means of a process for separating suspensions in the liquid phase and in solid particles which consists of bringing the suspensions into a fixed perforated shell, subjecting the suspension to the action of centrifugal forces to passing the liquid phase through the perforated ferrule and discharging solid particles from the perforated ferrule which is characterized according to the present invention, in that a gas is introduced which is then swirled to create centrifugal forces

in the perforated shell.

  Thanks to the introduction into the perforated shell of a gas which is then swirled, the centrifugal forces act for quite a long time. As a result, the rotation of the suspension does not weaken more quickly. As a result, a large amount of liquid phase passes through the orifices of the perforated ferrule outwards, which contributes to the noticeable reduction in

the moisture of the solid particles.

  By introducing the gas which then swirls, a high suspension pressure is created in the vicinity of the inner wall of the perforated shell relative to that near the outer wall, thus contributing to the

  passage of the liquid phase through the perforated ferrule.

  In addition, centrifugal forces are generated by the movement of the vortex gas and the suspension in the perforated shell and they also contribute to the passage of the liquid phase through the perforated shell. The amount of liquid phase entrained with solid particles also decreases as a result of the evaporation of a liquid phase portion of the surface of the solid particles when

come in contact with the gas.

  The solid particles form, on the inner surface of the perforated ferrule, a layer formed,

  as a rule, the thickness of a solid particle.

  The solid particles are then vigorously mixed in the suspension layer which results in a more complete evacuation of the liquid phase from the interstices between the solid particles. This further contributes to reducing the amount of liquid phase evacuated with the

solid particles.

  The amount of liquid phase at the exit of the perforated shell is reduced because the gas is constantly circulating through the solid particle layer formed on the inner surface of the perforated shell, in the radial direction, under the action of centrifugal forces. as well as under the effect of the difference of the pressures on

  the outer and inner surfaces of the perforated shell.

  It is useful if the circumferential speed is

from 20 to 50 m / s.

  Thanks to the relatively high velocity of the swirling gas, the solid particles contained in the suspension are also driven in a high speed movement and, consequently, the rotation of the gas with the

  suspension occurs in a more intensive manner.

  It also follows that a large portion of liquid phase passes through the perforated ferrule and the content of the particles emerging from the pierced ferrule in the liquid phase

is significantly diminished.

  If the circumferential speed is less than m / s, the intensity of the gas movement together with the suspension decreases and the content of the solid particles in the liquid phase at the exit of the perforated shell increases, which results in a decrease in the quality of the 'a product

finished.

  If the circumferential velocity of the gas is higher than

  less than 50 m / s the movement of the gas with the suspension intensifies significantly and causes the separation of liquid phase drops from the surface of the layer of the suspension on the perforated shell and their drive towards the center of the associated swirling current o is, as we know, a zone of depression, and, consequently,

  the evacuation of these drops together with the particles

  the solids of the perforated ferrule. As a result, the content of

  Moisture particles are noticeable.

  It is recommended that the swirling gas be introduced into the perforated shell in two streams, that the temperature of the first stream be between 0 C and 40 C and that the second is greater than 40 C and that the second stream is introduced into the shell perforated below in the lower part following the

movement of the first current.

  If the gas is introduced in two streams, the first stream is introduced at a temperature of 0 C to C, which corresponds to the ambient air temperature and

  does not require additional heating or cooling

  silent. It is then possible to use for several types of suspensions such as, for example, polyethylene, polystyrene, ammonium sulfate, etc. the air of the surrounding medium.

  The second stream is heated to a temperature of

  higher than 40 ° C. By using this reheating, it ensures the obtaining of solid particles with a minimum content of liquid phase, the energy consumption is small.

  The first gas stream is intended for separa-

  mechanics of the liquid phase of solid particles, generally performed by means of centrifugal forces. In this

  In fact, it is possible to use the medium air approximately

  The temperature is usually between 0 C and 40 C. A temperature below zero requires heating the air drawn in while a temperature above

40 C requires to cool.

  The second gas stream is intended to permanently separate the liquid phase of the solid particles also using centrifugal forces and, moreover, under the action of the evaporation of a liquid phase portion.

  when it comes into contact with the heated gas.

  If the temperature of the second gas stream is less than 40 C, the evaporation of the liquid phase from the surface of the solid particles is less intense. When separating suspensions composed of saturated crystals of material and of a solution of this material in the liquid phase it is recommended to humidify a gas

brought into the perforated shell.

  After humidification of the gas in vapor, the liquid phase no longer evaporates from the suspension composed of the crystals of a material and a saturated solution of the same

  matter in the liquid phase and the liquid phase is

  in the suspension is no longer oversaturated and small crystals are no longer formed on the surface of the perforated ferrule. This ensures the continuous implementation of the claimed process of the separation of suspensions by eliminating the risk of clogging of the orifices of the

  ferrule perforated by small crystals.

  For the separation process of the suspensions

  crystals of a material and a saturated solution of the same material, it is useful to introduce a solvent

  in the suspension before its introduction into the perforated shell.

  By introducing a solvent into the suspension

  crystals and saturated solution, it ensures a more effective separation of the suspension under the action of a

  swirling current of gas. In this case, the concentration

  saturated solution decreases and the risk of its

  supersaturation which may occur as a result of the evaporation

  of a portion of the liquid phase when it enters

  contact with the swirling gas stream is eliminated.

  Consequently, the conditions for the passage of the phase

  liquid under the action of the gas stream through the ori-

  these of the perforated ferrule in the body are found to be better

  Rees. The claimed method thus ensures the separation

  suspension and the reduction of the content of solid particles in the liquid phase resulting in

perforated ferrule.

  The problem is also solved with the aid of a device for carrying out the method for separating liquid-phase suspensions and solid particles comprising a body with a pipe for the evacuation of the liquid phase and a perforated shell fixed mounting inside the body at a distance from the walls of the body and provided with a pipe for feeding the suspension of one end of the perforated shell and a pipe for the evacuation of the particles solids from the other end of the perforated shell and characterized, according to the invention, in that there is provided at least one pipe for the introduction of a gas inside the perforated shell with means for the swirl and tubing

  for evacuation of gas from the body.

  This embodiment of the device makes it possible to perform in a more simple and efficient manner the claimed process for separating suspensions in liquid phases.

and solid particles.

  The current swirling means contributes to raising the resistance to the gas and slurry pressure and increasing the pressure difference on the inner and outer walls of the perforated shell by driving efficiently. the

  liquid phase through the orifices of the perforated ferrule.

  The current swirling means also makes it possible to impart to the gas stream and suspension a swirling motion, that is, to increase the

  centrifugal forces acting on them.

  It is recommended that the gas swirling means be constituted by fixed vanes mounted at the outlet of the gas supply pipe inside the

perforated ferrule.

  This embodiment of the gas swirling means makes it possible to ensure easy and simple assembly of the device for implementing the claimed method of

  separation of suspensions in the liquid phase and in particular

solids.

  It is also recommended to plan

  coldales, mounted from the outside of the perforated ferrule between it and the walls of the body and inclined towards the

  ferrule in the direction of swirling gas.

  Due to the presence of the helical blades, mounted from the outside on the perforated ferrule, the liquid phase no longer remains on the outer surface of the perforated ferrule; it is evacuated along said blades to the side wall of the body. This embodiment significantly reduces the co-operating forces of the slurry on the inner surface of the perforated shell with the liquid phase moving on the outer surface

  perforated ferrule. As a result, the rotation of the

  gas and suspension common slows down. As a result, the energy of the gas and suspension stream decreases, which facilitates the passage of the liquid phase of the suspension through the orifices of the perforated shell and contributes to the

  a more intense separation of the suspensions.

  It is advantageous to mount in the body, another pipe for the evacuation of the gas which is put in

  communication with the hollow inside the ferrule

  drilled and bonded together with the gas discharge manifold to the gas supply manifold to the interior of the

  perforated ferrule through a delivery member.

  By connecting each of the gas discharge pipes through a discharge member to the gas supply pipe a closed gas stream is formed which does not come into contact with the ambient environment. By applying this mode, it is possible to separate the suspensions, from the liquid phase of which a material evaporates, whose presence

  is not desirable in the surrounding environment.

  In addition, by connecting each of the evacuation

  gas flow through a discharge member to the gas supply pipe, it is possible to prevent clogging of the apertures of the perforated shell because the closed gas stream is saturated and small crystals do not occur. form more on the inner surface of

the perforated shell.

  It is useful for the suspension supply tubing to be mounted vertically, to be oriented with its outlet end upwards, to be provided with longitudinal slots and to be surrounded, on the part with the slots , a hood provided with a liquid phase evacuation pipe and that the gas supply pipe is disposed above the longitudinal slots

  the suspension feed tubing.

  Due to the fact that the suspension supply pipe is mounted vertically and that its outlet end is oriented upwards, it is possible to separate suspensions where the density of the solid particles is

  less than the density of the liquid phase.

  Due to the fact that the suspension supply pipe is provided with longitudinal slots and surrounded, on the part with these slots, with a cover having a liquid phase evacuation pipe, the main liquid phase portion of the suspension of the solid particles through the longitudinal slots and the efficiency of the separation of the suspension are high because it is no longer necessary to swirl the main portion

  of liquid phase passing through the longitudinal slots

  and the swirling gas only acts on the portion

  residual liquid phase and solid particles.

  In this case, it is clear that the liquid phase waste portion and solid particles are more intensely swirled by the gas and are subjected to greater centrifugal forces which pass a greater amount of liquid phase through the

orifices of the perforated ferrule.

  Because the gas supply tubing is

  seated above the longitudinal slots of the tubing

  suspension feed, the gas stream partially brews

  the thickened suspension layer by decreasing the

  content of the suspension in the liquid phase.

  It is also advantageous if the body is

  at least two sections disposed successively and that a solid intermediate annular piece is disposed in the perforated shell at the point of connection of the body sections and connected to the bottom of the first section of the body, that a swirling means of the suspension and gas flow is mounted inside this intermediate part, that the suspension supply pipe is disposed along the longitudinal axis of the perforated shell, a conical ogive is mounted near its outlet end for current dissipation

  and is oriented from the top of the cone to the said end

  mity, that the gas supply pipe is mounted in the first cone section at the top according to the current relative to the outlet end of the suspension supply pipe and that each section of the body is provided with its own tubing for the evacuation of gas and of its own

  tubing for the evacuation of the liquid phase.

  By constituting the body at least by two sections arranged successively and equipping each section of the body with its own gas evacuation pipe and its own liquid phase evacuation pipe, the energy of the vortex flow of the that the main portion of the liquid phase is separated in the first section following the displacement

  suspension current and is evacuated from the body.

  Accordingly, the main liquid phase portion does not prevent the rotation of the stream of gas and wet solid particles within the perforated shell and the separation of the liquid phase waste portion. The integral intermediate annular piece associated with the bottom of the first section of the body inside which is mounted a swirling means of the suspension and gas flow, allows to periodically distribute the suspension and gas flow along the entire section of the the perforated shell. This ensures a more rational use of the gas stream to pass the phase

  liquid through the orifices of the perforated ferrule.

  Arranging the suspension supply tubing along the longitudinal axis of the perforated shell and mounting the gas supply tubing in the first section of the body, above the outlet end of the suspension supply tubing following the displacement of the current and along the axis of the perforated shell, a low pressure zone is formed, making it possible to bring the suspensions having a small content of liquid phase and the suspensions

  in which the density of the solid particles is less than

  than the liquid phase.

  By arranging a conical separation ogive near the outlet end of the suspension supply pipe, it ensures a more even distribution of the suspension along the entire perimeter of the perforated shell and

  eliminates unproductive losses of gas.

  Thus, the claimed process for the separation of suspensions in the liquid phase and in solid particles and the device for carrying out this process carried out according to the invention ensure a sufficient separation

  complete solid particles of the liquid phase.

  The claimed method of separating suspen-

  It requires a low power consumption, is easy to use, can be realized with a device whose design is simple and inexpensive to manufacture. The invention will be better understood and other purposes, details and advantages thereof will become more apparent.

  the light of the description which follows of a mode of realization

  DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 schematically represents a device for carrying out the proposed process for the preparation of suspensions in the liquid phase. and solid particles made according to the invention; - Figure 2 shows a similar device to that in Figure 1 in the case where it is provided with two pipes for the supply of gas; - Figure 3 shows a similar device to that of Figure 1 in the case where it is provided with helicoidal blades, mounted outside the perforated shell; - Figure 4 is a section according to Figure 3; FIG. 5 represents a device similar to that illustrated in FIG. 1, but in this case it is provided with another tubing for evacuation of the gas, the first and the second gas evacuation pipes being put in communication with the gas supply pipe through the discharge member; FIG. 6 schematically represents

  the device for carrying out the separation process

  liquid-phase suspensions and solid particles, produced according to the invention, in a mode in which the suspension feed pipe is mounted

  vertically and the device is provided with longitudinal slots

  and is surrounded by a hood provided with a liquid phase evacuation tube, and - Figure 7 shows a device, similar to that of Figure 1, wherein the body is formed by two sections, the tubing suspension feed is arranged along the longitudinal axis of the perforated ferrule

  and a conical separation ogive is mounted near the ex-

  outlet end of said tubing.

  The process for separating the suspensions in the liquid phase and in the solid particles produced according to the invention

  will be named in the following description by abbreviation

"claimed process".

  According to the claimed method, provision is made for the suspension to be fed into a fixed perforated shell 1 (FIG. 1) and the suspension to be treated under the action of centrifugal forces in order to move the liquid phase to

through the perforated shell 1.

  To create centrifugal forces, a gas is introduced into the perforated shell 1 which is then rendered

vortex.

  The vortex gas begins to cooperate with the suspension on an initial sector of the ferrule 1 with respect to the introduction of the suspension (not designated by a reference). As a result, the suspension begins to turn too. Under the action of the centrifugal forces acting on the swirling suspension current, the suspension is projected towards the inner surface of the perforated shell 1. A pressure difference is created between the inner and outer surfaces of the perforated shell 1, by means of which the liquid phase is forced through the orifices of the perforated ferrule 1 while the solid particles and the gas move in a

  spiral to the inner surface of the perforated shell 1.

  During this movement, the solid particles mix intensely. As a result, the liquid phase between the solid particles is driven to the perforated shell 1 and passes through its orifices. During the subsequent swirl of the gas causing the particles

  solids separated from the liquid phase, the particulate layer

  the solids is agitated by the gas, in a radial direction relative to the axis of the perforated ferrule 1. Then, the solid particles not containing a liquid phase are

  discharged with a portion of gas from the perforated shell 1. The circumferential velocity of the swirling gas is 20 to 50 m / s and,

particular, in the case given

  circumferential speed is equal to 30 m / s.

  The swirling gas is introduced into the ferrule

  perforated in two streams. The temperature of the first

  rant is between 0 C and 40 C and that of the second is greater than 40 C. The second stream must be introduced into the perforated shell 1 in the lowest part in the direction of the first current 1. For the separation of a suspension of a polymer material, the temperature of the first stream is equal to 20 C and that of the second is 90 C. For the separation of a suspension composed of crystals of a material and a saturated solution of the same material in the liquid phase, the gas sent into the perforated shell 1 must be moistened. For example, to separate the suspension composed of ammonium sulfate crystals and the saturated solution of the same material in water,

  the gas introduced into the perforated shell 1 must be moist

  water vapor to prevent evaporation of the water in the slurry and, therefore, the supersaturation of the ammonium sulphate

formation of small crystals.

  In the same case where the suspension is composed of crystals of a material and the saturated solution of the same material in the liquid phase, a solvent must be introduced.

  in the suspension before bringing it into the ferrule

  1. For example, water is introduced into the solution composed of ammonium sulphate crystals and the solution

  saturated with ammonium sulphate in water.

  The proposed process for the separation of suspen-

  in the liquid phase and in solid particles will be described

  in detail in the description of the functioning of the

using this method.

  The device implementing the proposed method for the separation of suspensions in liquid phase and solid particles executed according to the invention will be named

  in the following description for abbreviation purposes

"claimed device".

  The claimed device comprises a perforated ferrule

  Fixed star 1 (Figure 1) having the shape of a cylinder mounted vertically. The upper and lower ends (not designated by references) of the ferrule 1 are open. The claimed device comprises a body 2 made

  also in the form of a cylinder mounted vertically.

  In other cases, it is possible to mount the shell 1 and the body 2 in an inclined or even horizontal manner. The ferrule 1 is mounted inside the body 2 to

distance from its walls.

  The longitudinal geometric axis 3 of the body 2

  with the longitudinal geometric axis of the ferrule

  perforated 1 designated by the same reference 3.

  In the upper lid 4 of the body 2, there is provided an orifice (not designated by a reference) in which is mounted a coaxial tubing 5 to the body 2 for the supply of the suspension in the shell 1 and made in the form of a truncated cone whose small base (not designated)

is pointing down.

  The upper base, a large base of the truncated side of the tubing 5, is closed by a cover 6 in which a tube 7 is mounted for feeding the suspension into the tubing 5. The cover 6 is fixed to the flange 8 of the

  tubing 5 using known means (not shown).

  A pipe 9 is provided for the introduction of the gas into the upper end of the shell 1 and is mounted in the orifice (not designated by a reference), formed in the cover 6 along the axis 3. The tubing 9 is disposed in the tubing 5 coaxially therewith so that its lower edge (not designated by a

  reference) form, with the edge (not designated by a reference

  also from the small base of the truncated cone of tubing 5, a space 9a whose value must be determined in accordance with the size of the solid particles and is

  equal to three diameters of the solid particles of the

  pension. An annular spacer 10 is rigidly attached to the lower base of the tubing 5 using

  known means (not shown). This piece inter

  is used to connect the tubing 5 to the shell 1 and is telescopically connected to the upper part of

the shell 1.

  A tubing 11 for evacuating the liquid phase

  is mounted in the lower part of the body 2, radial-

  axle 3, and a gas supply pipe 12 is also mounted radially in the upper part of the

body.

  A tubing 14 is fixed to the bottom 13 of the body 2.

  In this case, it is welded to the bottom 13. The tubing 14 is disposed coaxially to the shell 1 and is telescopically connected to its lower part. The tubing 14 is intended to evacuate the solid particles from the lower end of the perforated ferrule of the ferrule 1 and is in the form of an annular intercalary piece.

  similar to the insert 10.

  A truncated cone shaped conical member 15 is also attached to the bottom 13 of the body 2 by known means (not shown). The bottom 13 of the body 2 serves as a large base for the element 15. An opening 16 is provided in the small lower base of the conical element 15 for discharging the solid particles from the claimed device to a collector (not shown) made according to

a known technique.

  A means 17 for swirling gas is

  in the form of a blade designated by the same reference

  17, is mounted in the gas supply pipe 9.

  Blading 17 comprises four vanes (not designated by a reference), fixed permanently on the ogive (not designated by a reference) arranged along the axis 3 and oriented at an angle close to 37 relative to the direction A of the gas flow brought into the pipe 9. The ends of the blades remote from the warhead are fixed by

* welding to the wall of the tubing 9.

  In the case where the swirling gas is fed into the perforated shell 1 in two streams as shown in FIG. 2, the pipe 9 is intended to introduce

  the first stream and the tubing 18, arranged in the

  of the tubing 9 and passing along its geometric axis.

  longitudinal coinciding with the axis 3, is intended for the introduction of the second current. The outlet mouth (not designated by a reference) of the tubing 18 is disposed below the outlet mouth (not designated by a reference) of the tubing 9. The tubing 18 is in the form of a bend as illustrated. in FIG. 2 and its input end (not designated), intended to communicate with the source (not represented) of gas

  heated is released from the tubing 9 through an opening

  ture (not designated) practiced in its wall.

  A swirling means 17a of the gas, constituted by a vane, designated by the same reference 17a, is housed in the tubing 9 and its vanes are fixed permanently on the tubes 9 and 18. A swirling means 19 of the gas, produced under shape of a vane, designated by the same reference 19 and made according to a design similar to

  that of the blading 17 is mounted in the tubing 18.

  In the case where the claimed device is made according to the mode illustrated in Figures 3, 4, it comprises eight helical blades 20, mounted outside the

  ferrule and regularly distributed on its outer surface.

  The blades 20 are disposed between the shell 1 and the walls of the body 2 and are inclined relative to the shell 1 by an angle of 30 in the direction of the rotation of the gas indicated by the arrow B (Figure 4). The free ends (not referenced) of the blades 20 are spaced from the inner surface of the body 2 by a distance sufficient to allow the flow of the liquid phase following the

inner surface of the body 2.

  The blades 20 are intended to separate, from the outer surface of the ferrule 1 in an efficient manner, the liquid phase which has passed through the orifices of the ferrule

perforated.

  In the case where the claimed device is made according to the mode shown in Figure 5, the body 2 is provided with another pipe 21 for the evacuation of gas disposed below the bottom 13 and mounted in the orifice

  (not referenced) practiced in the side wall of the

  The longitudinal geometric axis (no

  designated) of the tubing 21 is perpendicular to the axis 3.

  The pipe 21 is placed in communication with the hollow of the shell 1 and serves to evacuate the portion of gas that remains in the vortex suspension stream

  located at the exit of the ferrule 1.

  The pipes 12 and 21 are placed in communication with the gas supply pipe 9 using the pipes 22 and 23 respectively through a discharge member

  realized according to a known design suitable for this purpose.

tif and driving 25.

  The device claimed, illustrated in Figure 6 comprises, as the device shown in Figure 1, a cylindrical perforated shell 1, the longitudinal geometric axis 3 is arranged vertically. The upper and lower ends of the ferrule 1 are open. The ferrule 1 is mounted inside the body 2 at a distance from its walls. The longitudinal geometric axis of the body 2 coincides with the longitudinal axis of the ferrule 1 and

  is designated by the same reference 3.

  In the upper lid 4 of the body 2 is practically

  an opening (not referenced) in which is fixed rigidly a discharge pipe 26 of the particles

  solid. The tubing 26 is cylindrical in shape and

  coaxially to the perforated shell 1. The ferrule is

  1 is telescopically connected by its upper part to the lower part, in FIG.

referenced), of the tubing 26.

  The body 2 houses a tubing 11 for evacuation

  of the liquid phase, disposed near the bottom 13 perpendicularly

  the stretching axis 3 and a pipe 12 for evacuation of gas, disposed in the vicinity of the upper cover 4 also

perpendicular to the axis 3.

  Tubing 27 is provided for feeding the sus-

  pension. It consists of a cylindrical ring

  mounted below the ferrule 1, vertically and coaxially

  to the ferrule 1. The outlet mouth 28 of the tubular

  lure 27 is oriented upwards and is telescopically linked

  to the ferrule 1 and is rigidly connected to the bottom 13 to

using known means.

  Eight longitudinal slots 29 are formed in the wall of the tube 27 and regularly arranged along this cylindrical wall of the tubing 27 to equal

distance from each other.

  The width of each slot 29 is somewhat smaller than the diameter of the solid particles contained

in the suspension.

  A cylindrical hood 30, provided with a pipe 31 for the evacuation of the liquid phase, mounted parallel to the axis 3 in the opening of its lower end (not designated), surrounds the tubing 27 on the sector of its

length provided with slots 29.

  The tubing 32 for supplying gas is disposed

  above the slots 29 and in particular between the cover 30 and the bottom 19 of the body 2. The longitudinal geometric axis (no

  referenced) of the tubing 32 is perpendicular to the axis 3.

  This pipe 32 is intended for the tangential supply of

  gas. An orifice 33 is made in the wall of the tubular

  lure 27 for bringing gas tangentially to the walls of

tubing 27.

  In the case where the claimed device is made according to the mode shown in FIG. 7, the body 34 is

  constituted by two cylindrical sections arranged successively

  along the longitudinal vertical geometric axis: an upper section 36 and a lower section 37,

  having, in this case, the same height and the same diameter.

  The upper section 36 has a cover 38 and a bottom 39 serving, at the same time, with a cover at the top.

  lower section 37 having its own bottom 40.

  A perforated ferrule 41 is mounted inside the body 34 coaxially with it and at a distance from its walls. Its ends (not designated) are open. The shell 41 is formed in the form of a cylinder and passes through an opening, provided (not designated) in the bottom 39, extends from the cover 38 to which

  it is rigidly fixed using known means,

  than at the bottom 40 to which it is also fixed rigidly.

  A cylindrical casing 42, whose bottom 43 is oriented upwards, is rigidly fixed to the upper end of the shell 41 using known means and its lower edge (not designated) is fixed in the opening axial (not designated) of the cover 38 and also reads telescopically to the shell 41 using known means. A tubing 44 is provided for the supply of the suspension. It is of cylindrical shape, is disposed along the longitudinal axis 35 of the ferrule 41 and is mounted in the axial opening (not designated) provided in the bottom 43 of the casing 42. A conical separation ogive 45, executed according to a design known, is disposed near

  the outlet end 44a of the approximate tubing 44

  at the level of the lower edge of the casing 42 along the axis 35. It is intended to regularly distribute the suspension flow coming from the tubing 44

  orienting it towards the inner wall of the ferrule 41.

  The conical warhead 45 is oriented towards the tubing 44 by the

top of the cane.

  A pipe 46 is provided for the supply of gas.

  It is mounted in the opening (not designated) in the side wall of the casing 42 above the outlet mouth 44a of the tubing 44, according to the current. The geometric axis of the pipe 46 is perpendicular to the axis 35. This ensures the tangential supply of the gas into the pipe.

  box 42 with respect to its walls.

  The tubing 47 for feeding the solid particles passing through the axial opening (not designated) provided in the bottom 40 of the section 37 is telescopically connected by its upper edge to the lower end (not designated) of

ferrule 41.

  A full annular spacer piece 48 is disposed in the ferrule 41 at the junction of the sections 36, 37 of the body 34 and is secured to the bottom 39 of the upper section 36 of the body 34. A swirling means 49 suspension and gas flow is realized in the form of a vane, designated by the same

  reference 49 and is mounted inside the inter-

  calaire 48. It comprises six vanes (not designated) inclined angularly with respect to the axis 35. They are fixed by one of their ends on the ogive (not designated) and rigidly connected by the others, in this case, by welding

to insert 48.

  Tubing 50 is provided in the upper section.

  the tubing 51 is disposed in the lower section 37 for the evacuation of the gas and is arranged radially in the lower section 37 for evacuation of the gas and is arranged radially relative to the axis 35 below the cover 38.

under its cover 39.

  Tubing 52 is provided in the upper section.

  for the evacuation of the liquid phase and is arranged

  above the bottom 39 of the upper section 36 perpendicularly

  35. Similar tubing 53 is provided in the lower section 37 for the evacuation of the liquid phase and is also arranged perpendicularly to

  the axis 35 above the bottom 40 of the lower section 37.

  In the claimed device made according to the other mode, the body may consist of a greater number of sections. The perforated ferrule may also be constituted by several sections. In this case, to create a constant axial speed of the current and ensure a sufficiently large value unlike the pressures of the

  suspension and gas on the inner and outer surfaces

  the perforated ferrule, the diameter of each posterior section following the current shall be less than

from the previous section.

  The device implementing the proposed method for separating suspensions in the liquid phase and in solid particles produced according to FIG.

the following way.

  The operator starts from the console of

  command (not designated) the displacer (not shown)

  felt), made according to a known design that delivers gas from a source (not shown) to the gas supply pipe 9. Arriving in tubing 9, the gas

  meets the vanes of the blade 17, inclined

  stretch relative to the longitudinal axis of the tubing 9 and then swirls. Going down a spiral,

  the gas opens out of the tubing 9 and the interchange part

  10 in the perforated shell 1.

  After the start of the delivery member, the operator opens a shutter (not shown), made according to a known design, mounted in the tube 7 and the suspension flows from the source (not shown) by gravity to the suspension supply pipe 5 from which it flows through the space 9a, opening therefrom in the form of a film along the inner surface of the cylindrical intermediate part 10 and reaches the shell

perforated 1.

  In the upper part of the shell 1 following the displacement of the current, the stream of gas acts on the suspension film by driving it in a movement

  turning. When rotating, the gas generates centrifugal forces

  which apply the suspension film against the inner surface of the perforated shell 1. A high pressure of the gas stream and suspension is created by

  of the inner surface of the perforated shell 1 by

  port on the outer surface of this shell 1. Under the effect

  of this pressure, the liquid phase contained in the

  pension is driven through holes in the ferrule

  perforated 1 to its outer surface.

  Then the liquid phase, separated from the particles

  solids, flows by gravity downwards depending on the

  outer face of the shell 1, reaches the bottom 13 where it is evacuated by the pipe 11 phase evacuation

  liquid from the claimed device.

  The main portion of the liquid phase of suspension

  In this case, the solid particles containing a certain amount of liquid phase are displaced by the centrifugal forces and the gravitational forces follow a downward spiral path and are blown off. by the gas in the radial direction. A portion of gas passes through the perforated shell 1 to the body 2 where it is discharged through the gas discharge pipe 12 of the

claimed device.

  The gas, which failed to pass through the orifices

  perforated shell 1 in the body 2, opens

  with the solid particles separated from the liquid phase of the tubing 14 in the conical element and is removed from the claimed device together with the

  solid particles through the opening 16.

  The device proposed for carrying out the process for separating the suspensions in the liquid phase and in the solid particles executed according to FIG. 2 functions in a similar manner to the device described above carried out in accordance with the mode illustrated in FIG. 1. It differs

  in that the gas is introduced in two streams.

  The first gas stream is introduced at the temperature

  20 C in the shell 1 by the tubing 9 in

  which is swirled by the blading 17a.

  The second gas stream at the temperature of 90 ° C is introduced into the shell 1, in its lower part in the direction of movement of the first stream,

  by tubing 18 and is vortexed by the vane 19.

  Then, the device works in an analogous

  to the device shown in Figure 1.

  The device shown in FIGS. 3 and 4 operates in the same manner as described for the device made according to the mode illustrated in FIG. 1, but this device differs in that the outer surface of the perforated shell 1 is provided with helical vanes 20. In this case, the liquid phase of the suspension that arrives on the outer surface of the shell 1 is moved along the blades 20 towards the inner surface of the body 2, then the liquid phase flows downwardly into the body by gravity. 2, reaches the bottom 13 and is removed from the device

claimed by tubing 11.

  The device proposed for carrying out the method for separating the suspensions in the liquid phase and solid particles executed in the manner shown in FIG. 5 operates in a similar manner to the case described for the device illustrated in FIG. 1 and previously described but in FIG. this device a portion of gas that failed to pass through the holes of the perforated shell 1 is discharged through the pipe 21, placed in communication with the pipe 23 with the discharge member 24, executed according to any known design. Through a pipe 22, the pipe 12 is also connected to the discharge member 24, placed in communication, in turn, with the pipe 25 with the gas supply pipe 9. A circuit is thus formed. closed o moves

the gas.

  The device implementing the proposed method for the separation of suspensions in liquid phase and in solid particles carried out according to the mode illustrated on

  Figure 6 operates as follows.

  The operator puts, from the control panel, the discharging device in operation which delivers the gas into the tubing 32 for supplying gas and the gas that arrives through

  the opening 33 in the tubing 27 swirls.

  At the same time, the operator opens, on the pipe (not shown) of suspension supply, a shutter (not shown) made according to a known design and the suspension current arrives from the suspension source in the pipe 27 and s raise up. A main portion of liquid phase, contained in the suspension, flows through the slots 29 by gravity into the hood where it is removed from the device claimed by the

tubing 31.

  Under the action of the kinetic pressure of the suspension current arrived in the tubing 27 and under the effect of the Archimedes force, upward thrust, the solid particles containing the residual portion of the liquid phase are displaced upwards along the tubing 27 above the slots 29 where they are subjected to the action of vortex gas. The solid particles are vortexed together with the liquid phase portion. The gas stream and suspension is a

  updraft. For this reason, we introduce the

  pension in tubing 27 in continuous.

  Centrifugal forces generated in the swirling stream of gases cause the particles to squeeze

  the liquid phase against the inner surface of the end

  outlet tee 28 of the tubing 27. The gas and suspension updraft emerges from the outlet end 28 of the tubing 27 and reaches the inner surface of the perforated shell 1. A high pressure of gas flow and of suspension is generated near the inner surface of the perforated shell 1, greater than that on the surface

  outer surface of this shell 1. Under the action of this

  the liquid phase lying between the particles

  solids is pushed through the perforated shell 1 and

  comes to its outer surface where it flows by gravity

  on the bottom 13 and from where it is removed from the device

diqué by the tubing 11.

  Then, the particles containing a certain amount of liquid phase move in the gas updraft along a helical path and are

  brewed by the gas in the radial direction.

  A portion of gas reaches through the ferrule

  perforated 1 in the body 2 where it is removed from the

  claimed by the tubing 12.

  Gas that has not passed through the ferrule

  drilled 1 into the body 2 is evacuated together with the

  solid particles through the tubing 26 of the

  dicated. The device implementing the proposed method for the separation of suspensions in liquid phase and in solid particles, carried out according to the mode shown on

  Figure 7 operates as follows.

  The operator starts from the control panel the delivery device which returns the gas from

  a source to tubing 46. The gas arrived through the opening

  ture provided in the casing 42 is driven by a swirling motion. At the same time, the operator opens, on driving

  suspension supply (not shown), a component (not shown)

  felt), realized according to a known design, and the suspension current arrives from the source in the tubing

  suspension supply 44. The suspension current encountered

  The conical separation web 45 is distributed in a sufficiently regular manner along the perimeter of the perforated shell 41. A portion of liquid phase passes through the orifices of the perforated shell 42 under the effect of the shock generated as a result of the collision of the suspension, after

  its fall of the tubing 44, against the wall of the shell 41.

  In the vicinity of the wall of the shell 41, the suspension is subjected to the action of the vortex flow of gas arrived in the shell 41 in the cylindrical casing 42.

  Swirling gas also communicates with

  in the liquid phase, which remains there, a movement

swirling.

  Centrifugal forces are then generated in the swirling stream of gases that cause the solid particles to tighten and the liquid phase against the surface.

  inside the perforated shell 41.

  High pressure of the gas stream and sus-

  pension is then created in the vicinity of the

  The action of this pressure causes the liquid phase contained in the solid particles to be forced through the apertures of the perforated shell 1 towards its outer surface. Then, it flows by gravity to the bottom 39 and is removed from the claimed device

through the tubing 52.

  A portion of gas, which passes through the ferrule 41, is

  discharged from the device claimed by the tubing 50.

  The solid particles containing a small amount of liquid phase together with the main gas portion in the annular spacer 48 o collide with the vanes of the vane 49

  and are then set in motion swirling.

  The gas stream entraining solid particles and the liquid phase emerges from the intermediate piece 48 and again reaches the perforated shell 41 where the liquid phase is separated from the solid particles in a manner similar to the case described previously. Furthermore, in this case, a significantly larger portion of gas passes radially through the layer of solid particles and brings with it the residual liquid phase due to the kinetic pressure. From the lower section 37, the liquid phase is evacuated via the pipe 53 and the gas is

discharged through the tubing 51.

  Solid particles separated from the liquid phase fall by gravity and are removed from the claimed device

through the tubing 47.

  The proposed process for the separation of suspensions in liquid phase and solid particles and the device

  who implement it have satisfied the tests.

  The tests showed that the use of the

  proposed for the separation of suspensions in liquid phase and solid particles and the device, which

  implements, allows, the yield being identical to the dis-

  known at the moment and used for the

  separation of suspensions, to reduce manufacturing costs

  the claimed device, to at least simplify maintenance and repair, to increase the reliability of

  its functioning and to improve the qualities of

solids produced.

  For example, to separate the suspension of polyethylene, whose liquid phase is water, the claimed device, whose yield is 1 t / h of dry polyethylene is

  characterized by the following parameters: the outer diameter

  The body length is 0.3 m, the length of the body (without tubing) is 0.6 m. The mass of the claimed device

  is close to 20 kg. The power of the organ of repression

  reaches 1 kW. The moisture of the solid particles collected at the outlet of the claimed device is

0.1% maximum.

Claims (11)

  A process for separating suspensions in the liquid phase and in solid particles, which comprises bringing a suspension into a perforated shell (1), subjecting this suspension to centrifugal forces to release the liquid phase through the perforated shell (1). ) and evacuate   the solid particles from the perforated shell (1),   because in order to create the centrifugal forces   duit in the perforated shell (1) a gas which is then animated a swirling motion.   2. Method according to claim 1, characterized in that the circumferential velocity of the swirling gas is 20 to 50 m / s.   3. Method according to claim 1, characterized in that the swirling gas is introduced into the perforated shell (1) in two streams, in that the temperature of the   first current is between 0 C and 40 C and the temperature   the second current is greater than 40 C and   that the second stream is introduced into the perforated ferrule   lower (1), following the movement of the first current.   4. Process for separating suspensions composed of crystals of a material and a saturated solution of the same material in the liquid phase, according to the claim   1, characterized in that the gas supplied to the perforated ferrule   (1) is moistened with steam.   5. Process for separating suspensions, composed of the crystals of a material and of a saturated solution of the same material in the liquid phase, according to claim 1, characterized in that a solvent is introduced into the   suspension before introducing it into the perforated shell (1).   6. Device especially for implementing the method according to claim 1, comprising a body (2) provided with a tubing (11) for supplying liquid phase and a perforated shell (1) provided with a tubing (5). supplying suspension from one end of this perforated ferrule (1) and a discharge pipe (14) of the solid particles from the other end of the perforated ferrule (1), mounted   immobile inside this body (2) to some extent   relative to its walls, characterized in that it comprises at least one tubing (9) for introducing the gas into the perforated shell (1) and a swirling means (17) for the gas and a evacuation tubing gas (12) from the body (2).   7. Device according to claim 6, characterized in that the swirling means (17) of the gas is constituted by fixed vanes mounted at the outlet of the   gas supply pipe (9) inside the shell (1).   8. Device according to claim 6, characterized in that it comprises helical blades (20) which are mounted from outside the perforated shell (1) between the shell and the walls of the body (2) and which are angularly inclined with respect to this ferrule in the direction of the swirling of the gas.   9. Device according to claim 6, characterized in that another pipe (21) is mounted in the body (2) for evacuation of the gas and is placed in communication with the cavity of the inside of the ferrule (1). ) and connected together with the gas discharge pipe (12) to the gas supply pipe (9) inside the ferrule   perforated (1) through the discharge member (24).   10. Device according to claim 6, characterized in that the suspension supply pipe (27) is mounted vertically, oriented by its outlet end (28) upwards, made with longitudinal slots (29) and is surrounded in the sector, provided with slots (29), a cover (30) with a liquid phase outlet pipe (31) and in that the gas supply pipe (32) is disposed above longitudinal slots (32) of   the tubing (27) for supplying suspension.   11. Device according to claim 6, characterized in that the body (34) is constituted by at least two sections (36, 37) arranged successively and in that it comprises mounted in the perforated shell (41) to the where the sections (36, 37) of the body (34) join, a solid annular spacer (48) associated with the bottom (39) of the first section (36) of the body (34) within the   which is mounted a means for swirling the cou-   suspension pipe and gas, in that the suspension pipe (44) is arranged along the longitudinal axis (35) of the perforated shell (41) and in that a conical ogive (45) for separation is mounted in the near its outlet end (44a) and is directed towards this end by the apex of the cone, in that the gas supply pipe (46) is mounted in the first section (36) of the body (34) at the top following the current with respect to the outlet end (44a) of the suspension supply pipe (44) and in that each section (36, 37) of the body (34) is provided with its own tubing liquid phase evacuation (52,53).