JPH0310363B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] Current methods for separating suspensions into liquid and solid particles are shown, for example, in USSR Inventor's Certificate No. 538729, according to which The liquid is sent to the stationary hole-opening shell.

The suspension is directed tangentially to the surface of the perforated shell so that the flow has a rotational motion.

As a result, a centrifugal force is created, forcing the liquid portion to pass through the shell. The solid particles move along the shell due to gravity and are thereby removed from the liquid.

According to this method, the separation of the liquid from the solid particles is caused by the centripetal force produced by the rotation of the suspension stream. However, this rotation is rapidly attenuated in the longitudinal direction of the shell due to its relatively large frictional force against the walls of the perforated shell, despite the low energy of the flow itself. As a result, the separation effect is greater at the bottom of the perforated shell due to the influence of the center of gravity. As a result, the liquid content is carried away along with the solid particles due to surface tension and adhesive forces. On the other hand, the moisture content of the solid particles being released remains high.

Furthermore, in the above method, the suspension after the liquid content has been removed moves as a layer on the inner surface of the perforated shell, and no relative movement of solid objects within the layer occurs.

The liquid present between the solid particles in this layer is removed from the shell along with the particles, but this causes the water content of the solid to be too high, ie an incomplete separation of the liquid from the solid particles occurs.

This is undesirable, especially when the separation of the suspension into a liquid is to obtain solid particles with minimal water content and it is the last step in the manufacturing process of the final product. I can say that.

A conventional device for carrying out the above method is also shown in the above Inventor's Certificate, which has a housing with an outlet sleeve for liquid discharge.

A perforated shell is located at the bottom of the housing and spaced from its walls. There is also an inlet sleeve for entering the suspension at the top of the perforated shell and an outlet sleeve for discharging solid particles from the opposite side (bottom) of the shell. The shell is frustoconically shaped, with its larger area facing upwardly toward the suspension supply sleeve, and is positioned within the housing such that their longitudinal axes coincide. Adjacent to the small area (bottom) of this truncated cone is an outlet sleeve for discharging solid particles.

A conical casing is disposed within the top of the housing coaxially with the perforated shell, the bottom of the casing facing the shell, and an annular gap left between the casing and the shell for passing the suspension. It will be done. This casing is intended to create a uniform distribution of the swell flow of suspension delivered from the suspension supply sleeve over the inner surface of the perforated shell.

This suspension supply sleeve is arranged tangentially to the surface of the perforated shell and is located approximately in the middle of the height of the conical casing.

As mentioned above, this device results in incomplete separation of liquid from solid particles.

[Problem that the invention seeks to solve]

An object of the present invention is to provide a method and apparatus for separating a suspension into liquid and solid particles, which generates centrifugal force so as to achieve complete separation of liquid from solid particles.

[Means for solving problems]

The above purpose is to separate a suspension into a liquid and solid particles by feeding the suspension into a stationary shell and applying centrifugal force to force the liquid to pass through the perforated shell to remove the solid particles. This is achieved by introducing a swale flow of gas into a perforated shell to create the centrifugal force.

By providing a swale gas flow to the perforated shell, the duration of the centrifugal force generated is increased so that the rotation of the suspension does not decay over a short period of time. Thus, a larger amount of the liquid phase passes through the shell and leaves the shell, resulting in a significant decrease in the water content of the solids.

The peripheral velocity of the gas swall flow is 20 to 50 m/s
It would be good if it were.

Due to such extremely high speed swall flow,
The solid particles in the suspension move at higher speeds and the gas and suspension rotate more closely together.

As a result, more liquid phase passes through the perforated shell and the liquid phase content of the solid particles becomes smaller.

If the peripheral velocity of the gas is lower than 20 m/s, the joint rotation of the gas and suspension is weakened and the water content of the solid particles at the shell outlet increases, reducing the quality of the finished product.

When the peripheral speed exceeds 50 m/s, the integral rotation becomes strong, the liquid phase droplets become perforated, the surface layer of the suspension on the shell is stripped off, and a swell flow of gas and suspension is created.
It is carried toward the center, which is the vacuum zone, and is ejected from the perforated shell along with the solid particles. As a result, the solids also contain considerable moisture.

The gas swall flow is the first at a temperature of 7 to 40°C.
The second stream is introduced into the perforated shell as two streams: a current flow and a second stream higher than 40°C, and the direction of the second stream is the same as the first stream, and the second stream is placed downstream of the first stream with respect to the perforated shell. It is a good idea to include it.

When the gas is introduced in two streams, the first stream is introduced at a temperature between 0 and 40 DEG C., which corresponds to the routine temperature of the surrounding atmosphere, so there is no need for separate heating or cooling. In this case, atmospheric air may be used for suspensions such as polyethylene, polystyrene, ammonium sulfide, etc.

The second stream is heated to a temperature above 40°C. This makes it possible to obtain solid particles with minimal water content despite low energy consumption.

The first gas flow is primarily for mechanical separation of the liquid phase from the solid particles by centrifugal force. Air can be used for this purpose, its temperature being between 0 and 40°C. Heating is required when the air temperature is below zero;
If the temperature exceeds 40℃, cooling is required.

The second gas stream ultimately separates the liquid from the solid particles by centrifugal force and evaporation of a portion of the liquid phase by contact with the preheated gas. If the temperature of the second gas stream is below 40°C, there will be less liquid evaporation.

In addition, in a method for separating a suspension consisting of a crystalline substance and a saturated solution thereof, the gas sent to the perforated shell should be wetted with steam beforehand.

This hot gas does not cause evaporation of the liquid phase from the suspension, nor does it result in supersaturation of the liquid phase forming part of the suspension and formation of fine crystals on the inner surface of the perforated shell. This allows continuous separation because the shell is not clogged with such crystals.

It is also possible to add a solvent to the suspension before sending it to the perforated shell.

The addition of a solvent allows a more effective separation of the suspension under the effect of a swell flow of gas, resulting in less condensation of the saturated solution and less evaporation of part of the liquid phase after contact with the gas. eliminates the possibility of oversaturation. This provides better conditions for conveying the liquid phase through the holes of the shell to the housing, making this method of separation of the suspension continuous and reducing the water content of the solids at the exit of the shell.

It is also an object of the invention to have a housing with an outlet sleeve for the discharge of the liquid phase and a perforated shell arranged within this housing at a distance from its wall, at one end of which the suspension is discharged. at least one inlet sleeve for introducing gas into the shell and having means for swalling the gas flow, with an inlet sleeve for conveying the solid particles and an outlet sleeve for discharging the solid particles at the other end; An apparatus for carrying out the method described above, characterized by an inlet sleeve having an inlet sleeve and an outlet sleeve for discharging the gas from the housing.

The means for gas swaling may be formed by a plurality of vanes fixedly arranged at the outlet of the gas from the inlet sleeve to the shell.

Such swaling means facilitate and simplify the assembly of the apparatus for carrying out the above method.

A spiral vane may be provided which is arranged on the outside of the shell between the perforated shell and the wall of the housing and which slopes towards the shell in the direction of the gas swale.

This spiral vane causes the liquid phase to flow along it towards the side wall of the housing and not to accumulate on the outer surface of the shell. This significantly reduces the interaction force between the suspension on the inner surface of the shell and the liquid phase moving on its outer surface, reducing the attenuation rate of the combined flow of gas and suspension. Furthermore, the flow energy of the gas and suspension is not reduced, facilitating the passage of the liquid phase in the suspension through the shell and providing a stronger separation.

A further gas release sleeve may be provided within the housing and connected to the interior of the shell and together with the main gas release sleeve may be connected to an inlet sleeve for introducing gas into the shell. These sleeves are connected to the gas inlet sleeves via blowers.

By connecting both gas discharge sleeves to the gas inlet sleeve via a blower, a closed gas flow is created, which is separated from the surrounding atmosphere. This allows the suspension to have a liquid phase fraction containing volatile substances that can pollute the atmosphere.

Furthermore, the communication between the two gas discharge sleeves and the gas inlet sleeve via the blower prevents clogging of the holes in the perforated shell. This is because the closed gas flow is constantly saturated so that no fine crystals form on the inner surface of the shell.

the suspension inlet sleeve is arranged vertically with its outlet facing upward and has a plurality of longitudinal slits, portions of the slits being enclosed within the casing of the outlet sleeve for liquid phase discharge; Advantageously, the gas inlet sleeve is arranged upstream of the slit in the suspension inlet sleeve.

The vertical orientation of the suspension inlet sleeve with its outlet end pointing upwards allows separation when the density of the solid is less than that of the liquid.

[Effect]

The suspension inlet sleeve has a number of longitudinal slits, some of which are inside the casing, so that the main part of the liquid is separated from the solid particles through these slits and the separation efficiency is improved. That is, it is not necessary to make the main portion of the liquid passing through the swall into a swall, and only the gas swale acts on the remaining liquid and solids. Therefore, the remaining liquid and solids are rotated more strongly by the gas flow and are subjected to greater centrifugal force, which causes the bulk liquid to flow through the pores of the shell.

The gas inlet sleeve is placed over the slit in the suspension inlet sleeve so that the gas stream is forced through the partially thickened suspension layer, thus reducing its liquid phase content.

The housing may also consist of at least two tandemly arranged sections, and at the junction of these sections of the housing, a solid annular insert is provided in the perforated shell, the insert being connected to the bottom plate of the first section of the housing. to create a means for gas and suspension swalling, while the suspension inlet sleeve is arranged coaxially with the longitudinal axis of the perforated shell and a conical flow divider is connected to the suspension inlet sleeve. It is preferable to provide it at the exit end. The top of the flow divider faces the sleeve. The gas inlet sleeve may also be disposed within the first section of the housing upstream of the outlet end of the suspension inlet sleeve, with each section of the housing having a respective gas release sleeve and a liquid release sleeve.

the housing comprises at least two tandemly arranged sections, each section having a gas and liquid ejection sleeve;
Gas swall can be used more effectively. This is because the main part of the liquid is separated in the first section (along the flow direction of the suspension) and discharged therefrom.

As a result, the main part of the liquid phase does not interfere with the rotation of the gas and wet solids streams inside the shell nor with the separation of the remaining part of the liquid phase.

The provision of an annular solid insert near the bottom plate of the first section of the housing with means for creating a swale of gas and suspension makes it possible to periodically bidistribute the flow of both over the entire cross-section of the shell. This allows more efficient use of the gas flow to force the liquid out through the holes in the shell.

Since the suspension inlet sleeve is arranged coaxially with the shell and the gas inlet sleeve is arranged within the first section of the housing upstream of its outlet end, a low pressure zone coaxial with the shell is created, whereby a small volume of liquid It is possible to separate suspensions with phase components and solids whose density is lower than that of liquids.

A conical flow divider located at the outlet end of the suspension inlet sleeve provides a uniform distribution of the suspension over the entire circumference of the shell, thus preventing wastage of gas.

In summary, the method and apparatus of the present invention allows for a completely complete separation of solids from liquids.

The method of the invention can be carried out with low energy consumption, and the device is simple in construction and easy to manufacture.

The device of the invention is small, has a relatively high overall capacity, is simple to operate, is reliable and has low manufacturing costs.

〔Example〕

The suspension to be separated is sent to a stationary perforated shell 1 (FIG. 1), and centrifugal force causes the liquid to pass through the shell 4.

Centrifugal force is provided by a gas flow applied to the shell, and this gas flow is defined as swall.

The gas swall is first located at the beginning of shell 1 (relative to the introduction of the suspension) section (not shown).
interacts with the suspension and rotates it. This swell flow of liquid is pressed against the inner surface of the shell 1 by the centrifugal force acting on it. A difference thus arises between the pressure on the inner surface of the shell 1 and the pressure on its outer surface. Due to this pressure difference, the liquid phase is reduced to 1 shell.
Through the pores, the solids and gas move in a spiral along the inner surface of the shell 1. This movement of solids and gas, combined with the stirring action of the bed of solids, forces the liquid between the solids against the surface of shell 1 and through its pores. The movement of the swale flow of gas with the solids separated from the liquid is accompanied by the blowing of the solid bed of gas in a radial direction with respect to the axis of the shell. The liquid-free solid is then discharged from the shell 1 along with the gas.

The peripheral velocity of the gas swall is between 20 and 50 m/s, in this example 30 m/s.

This swall is fed into shell 1 as two streams, one of which has a temperature between 0 and 40°C.
℃, and the other is above 40℃. A second stream is entered into shell 1 in the same direction as the first stream, but downstream thereof. In the case of separation of polymer suspensions, the temperature of the first stream is 20°C and the second stream is 90°C.

If the suspension consists of a saturated solution of the crystalline material and its liquid phase, the gas fed to shell 1 is pre-moistened with water vapor. For example, in the case of the separation of a suspension consisting of ammonium sulfate crystals and their saturated solution, the gas introduced into shell 1 is used to prevent the evaporation of the water forming part of the suspension and the supersaturation of ammonium sulfate and the formation of its microcrystals. moistened with water vapor.

If the suspension consists of crystals and a saturated solution thereof in liquid phase, a solvent is added to it before it is introduced into shell 1. When it consists of ammonium sulfate crystals and a saturated aqueous solution thereof, water is used as the solvent.

The method of the present invention will be explained in detail based on the apparatus for carrying out the method.

The device of the invention consists of a stationary shell 1 (FIG. 1) in the form of a vertical cylinder. The upper and lower ends (not shown) of the shell 1 are open.

The device also has a housing 2 in the form of a vertical cylinder.

In other embodiments, these shell 1 and housing 2
may be arranged inclined or horizontally.

The shell 1 is located within the housing 2 and is spaced from its walls.

The longitudinal axis 3 of the housing 2 is aligned with that of the shell 1.

The top cover 4 of the housing 2 is provided with an axial hole (not shown) in which an inlet sleeve 5 coaxial with the housing 2 and having a frustoconical shape is provided. The small area of the truncated cone faces downward.

The large area (top) of the sleeve 5 is closed by a cover 6, which has a pipe 7 for introducing the suspension into the sleeve 5. The cover 6 is secured to the flange 8 of the sleeve 5 by known means (not shown).

At the top of the shell 1 there is provided an inlet sleeve 9 for admitting gas, which sleeve lies in a hole (not shown) provided in the cover 6 coaxially with the shaft 3. The sleeve 9 has a lower edge (not shown) of a size determined by the size of the solid particles to be treated, together with the edge of the small area of the sleeve 5 (not shown).
It is coaxial with the sleeve 5 so as to form a clearance 9a that is about three times the particle diameter.

An annular insert 10 is fixed in a conventional manner to the bottom of the sleeve 5 and is adapted to connect the sleeve 5 to the shell 1. insert 1
0 is nested to the top of shell 1.

A liquid phase release sleeve 11 is provided at the bottom of the housing 2 radially relative to the axis 3 and a gas release sleeve 12 is provided at the top of the housing 2 also radially relative to the axis 3.

The slip 14 is attached (in this case by welding) to the bottom plate 13 of the housing 2, coaxial with the shell 1 and telescopically connected to its bottom. The sleeve 14 is adapted to emit solid particles from the bottom end of the shell 1 and has an annular insert shape similar to the insert 10.

A conical member 15 is mounted to the bottom plate 13 of the housing 2 in a known manner (not shown). The member 15 has a truncated cone shape, and a large area portion thereof is the housing 2.
This is the bottom plate 13 of. The bottom (small area) of the member 15 is provided with an opening 16 for discharging the solid particles into a conventional collector (not shown).

The gas inlet sleeve 9 has means 17 for swaling the gas flow, which means are identical to those indicated at 17.

The swall means 17 has four vanes (not shown) fixed to a cowl (not shown) coaxial with the shaft 3, these vanes are at an angle of approximately 37° to the flow direction A of the gas entering the sleeve 9. Has an angle. The blade end remote from the cowl is welded to the wall of the sleeve 9.

If the swall gas is sent to the shell 1 in two streams as shown in FIG. 2, the sleeve 9 passes the first stream and the second stream
It is introduced by a sleeve 18 coaxial with the axis aligned with the axis 3 inside the . The outlet of sleeve 18 (not shown) is downstream of the outlet of sleeve 9 (not shown). Sleeve 18 is curved as shown in FIG. 2 and its inlet end (not shown)
exits the sleeve 9 through a hole (not shown) in the wall of the sleeve 9. This hole is the preheat gas source (not shown)
contact.

The means 17a for swaling the gas are located in the sleeve 9 and are identical to these means 17a. Sleeve 18 also has gas swaling means 19 and is structurally similar to 17.

According to the embodiment shown in FIGS. 3 and 4, eight spiral blades 20 are arranged on the outer surface of the shell 1 at equal intervals. The vanes 20 are provided between the shell 1 and the wall of the housing 2 and are inclined toward the shell 1 at an angle of about 30 DEG in the direction of the gas, as indicated by arrow B in FIG. The free ends (not shown) of the vanes 20 are spaced from the surface of the housing 2 at a distance sufficient to allow the liquid phase to flow down the inner surface of the housing 2.

The vane 20 is provided to sufficiently separate the liquid phase from the outside of the shell 1 through the hole.

In the embodiment of FIG. 5, the housing 2 has a hole (not shown) made in the side wall of the member 15 below the bottom plate 13.
It has another gas release sleeve 21 that enters. The longitudinal axis (not shown) of the sleeve 21 is perpendicular to the axis 3.

The sleeve 21 communicates with the interior of the shell 1 and provides for the release of a portion of the gas which is within the swell of suspension at the outlet of the shell 1.

The shells 12 and 21 communicate with the sleeve 9 through lines 22 and 23, respectively, a blower 24 of suitable construction and along a line 25.

The embodiment of FIG. 6, similar to FIG. 1, has a stationary cylindrical perforated shell 1, the longitudinal axis 3 of which is vertical. The top and bottom of shell 1 are open. The shell 1 is within the housing 2 and is away from its walls. The longitudinal axis of housing 2 is aligned with that of shell 1 and is designated at 3.

The top cover 4 of the housing 2 has an axial hole (not shown) in which a solid particle release sleeve 26 is secured. This sleeve is cylindrical and coaxial with the shell 1. The shell 1 is telescopically connected at its top to the bottom of the sleeve 26 (shown in FIG. 6).

The housing 2 includes a liquid phase discharge sleeve 11 located on the bottom plate 13 and aligned with the shaft 3, and a cover 4.
It has a gas release sleeve 12 arranged so as to coincide with the shaft 3.

A suspension inlet sleeve 27 is provided which is a substantially cylindrical member arranged vertically and coaxially with the shell 1 . The outlet 28 of the sleeve 27 is directed upward and is nested with the shell 1 so that the bottom plate 1 can be removed by suitable means.
It is fixed at 3.

Eight longitudinal slits 29 are provided in the wall of the sleeve 27 at equal intervals.

The width of each slit 29 is somewhat smaller than the size of the solid particles.

The part of the sleeve 27 with the slit 29 is located within a casing 30, which has a liquid phase release sleeve 31 which fits into an opening in its bottom end face (not shown) parallel to the axis 3.

A gas inlet sleeve 32 is arranged upstream of the sleeve 29 between the casing 30 and the bottom plate 13 of the housing 2 . The longitudinal axis (not shown) of the sleeve 2 coincides with the axis 3. Sleeve 32 is for tangential feeding of gas and for this purpose sleeve 27
An opening 33 is provided in the wall of the sleeve 27 to allow gas to flow through the sleeve 27.
It is designed to be inserted tangentially to the wall.

In the embodiment of FIG. 7, the housing 34 is comprised of two tandem cylindrical sections, a top portion 36 and a bottom portion 37.
, both having a longitudinal axis 35 and the same height and diameter.

The top part 36 has a cover 38 and a bottom plate 39, the bottom plate 39 acting as a cover for the bottom part 37, which has a bottom plate 40.

Perforated shell 41 is coaxially disposed within housing 34 and spaced from the housing wall, and is open at both ends (not shown). Ciel 41
is cylindrical and extends from the cover 38 to the bottom plate 40 through a hole (not shown) in the bottom plate 39. cover 3
8 is fixed by an appropriate method, and a shell is similarly fixed to the bottom plate 40.

A cylindrical barrel 42 is suitably fixed to the top of the shell 41, with its bottom 43 facing upward;
Its lower edge (not shown) is secured within an axial opening (not shown) in the cover 38 and telescopically connects to the shell 41 as appropriate.

The bottom 4 of the barrel 42 is coaxial with the shaft 35 of the shell 41.
A cylindrical suspension inlet sleeve 44 is provided within the axial opening (not shown) of 3. A conical flow divider 45 of suitable construction is provided at the outlet 44a of the sleeve 44 at the level of the bottom edge of the barrel 42 coaxial with the shaft 35. This flow divider directs the suspension flow to sleeve 4.
4 into the inner surface of the shell 41. The top of flow divider 45 faces toward sleeve 44 .

The barrel 4 is located upstream of the outlet 44a of the sleeve 44.
A gas inlet sleeve 46 is provided within an opening (not shown) in the side wall of 2. The axis (not shown) of sleeve 46 is coincident with axis 35 and is adapted to admit gas tangentially to the wall of barrel 42.

Particle release sleeve 47 nests at its top edge with the lower end (not shown) of shell 41 through an opening (not shown) in bottom plate 40 of section 37.

Annular insert 48 is part 3 of housing 34
6 and 37 in the shell 41, which is located on the bottom plate 3 of the top 36 of the housing 34.
It is fixed at 9. The insert 48 has means 49 for swale of suspension and gas. Means 49
has six vanes at an angle to the axis 35, which are connected to a cowl (not shown) at one end of the blades.
The other end is fixed to the insert 48 (by welding).

The top part 36 has a gas release sleeve 50 radially relative to the axis 35 under the cover 38 .
A gas release sleeve 51 is likewise provided in the bottom part 37, which extends radially relative to the shaft 35 into the cover 39.
is placed below.

The top 36 also has a liquid phase release sleeve 52 on the bottom plate 39 of the top 36 that is coincident with the axis 35 . Similarly, a liquid phase release sleeve 53 is provided on the bottom 37 and is positioned on the bottom plate 40 of the bottom 37 in alignment with the axis 35 .

In other embodiments, the housing is comprised of multiple sections. The perforated shell also consists of multiple sections, each downstream section having a smaller diameter than the previous one to create a constant axial velocity and to reduce the effective pressure difference between the suspension and the inner and outer surfaces of the gas shell. It is becoming large enough.

The apparatus of FIG. 1 for carrying out the method of the invention operates as follows.

Gas from a source (not shown) to the gas inlet sleeve 9
A conventionally constructed blower (not shown) is activated from a control panel (not shown) to send the air to the air. When the gas enters the sleeve 9, it hits the fixed vanes of the swaling means 17, which are provided at an angle to the axis of the sleeve 9, and rotates. While spiraling down, the gas exits the sleeve 9 and insert 10 and enters the perforated shell 1.

After the blower is activated, a conventional gate (not shown) is opened to allow gravity to drain the suspension to the source (not shown).
from there into the inlet sleeve 5, from where the liquid flows in the form of a film down through the clearance 9a along the inner surface of the insert 10 into the shell.

Gas flow is at the top of shell 1 (along the flow direction)
It acts on the film-like suspension inside and rotates it. The rotation of the gas stream creates a centrifugal force that forces this film against the inner surface of the shell 1. As a result, an increased pressure of gas and suspension occurs on the inner surface of the shell 1 relative to the pressure on the outer surface, so that the liquid phase in the suspension exits through the holes of the shell 1 to the outer surface.

Next, the liquid phase separated from the solid flows down along the outer surface of the shell 1 due to gravity, reaches the bottom plate 13, and is discharged through the sleeve 11.

Most of the liquid in the suspension is separated in this part of shell 1. Particles containing some liquid are carried by the radial flow of gas and spiraled down by centrifugal force and gravity. A portion of the gas enters the housing through the shell 1 and is discharged from the sleeve 12.

The gas which has not passed through the holes in the shell 1 is directed with the particles to the conical member 15 where it is discharged together with the particles through the discharge opening 16.

The apparatus of FIG. 2 operates similarly to the apparatus of FIG. 1, except that there are two gas flows.

The first gas flow at 20° C. enters from the sleeve 9 and is swirled by the swirling means 17a.

A second gas stream at 90°C enters shell 1 downstream of the first gas stream through shell 18 and swales means 19.
It is rotated by

Other details are the same as in FIG. 1.

The device of FIGS. 3 and 4 operates in the same manner as that of FIG. 1, except that the spiral vanes are provided on the outer surface of the shell 1. The liquid phase of the suspension exiting the outer surface of the shell 1 moves on the vanes 20 toward the inner surface of the housing 2, where it flows down by gravity onto the bottom plate 13 of the housing 2 and is discharged through the sleeve 11.

The apparatus of FIG. 5 operates in the same manner as in FIG. 1, except that the part of the gas that does not pass through the holes in the shell 1 is discharged through a sleeve 21 which is connected by a line 23 to a blower 24. The sleeve 21 also serves as the pipe 2
1 connects the blower 24, and the blower 24
is connected to the gas inlet sleeve 9 by a pipe 25. As a result, the gas flow becomes a closed circuit.

The apparatus of FIG. 6 operates as follows.

Operate the blower to supply gas to the gas inlet sleeve 3
2 so that the gas passing through the tangential hole 33 in the sleeve 27 rotates.

At the same time, the gate (not shown) of the suspension supply line (not shown) is opened and the suspension enters and rises into the sleeve 27 from the source (not shown). Most of the liquid phase passes through the slit 29 into the casing 30 by gravity and is discharged from the sleeve 31.

Particles in the remainder of the liquid phase rise upward along sleeve 27 to the level of slit 29 due to the dynamic head and buoyancy forces generated by the suspension flow directed into sleeve 27, where they absorb the influence of the gas swale flow. receive. As a result, the particles undergo a swirl motion together with a portion of the liquid phase. The flow of gas and suspension is upward as the latter is continuously fed into the sleeve 27.

The centrifugal force created in the gas swale forces the liquid-containing particles against the inner surface of the outlet 28 of the sleeve 27. The upward flow of gas and suspension enters the inner surface of the shell 1 through the outlet 28 of the sleeve 27. As a result, the pressure increases on the inner surface relative to the outer surface of the shell 1, so that the liquid present between the particles passes through the shell 1 to its outer surface and flows down to the bottom plate 13 by gravity and is discharged through the sleeve 11.

Particles containing some liquid are then carried radially upward along spiral paths within the upward flow of gas.

A portion of the gas passes through the shell 1 into the housing 2 and is discharged from the sleeve 12.

Gases that do not enter the housing 2 from the shell 1 are discharged from the sleeve 26 together with the particles.

The apparatus of FIG. 7 operates as follows.

The control panel activates the blower to allow gas to enter the sleeve 46 from the source, thereby rotating the gas through the opening in the barrel 42.

At the same time, a gate (not shown) in the suspension supply line (not shown) is opened to send it to the inlet sleeve 44 . This flow hits the flow divider 45 and is uniformly distributed along the periphery of the shell 41. A portion of the liquid phase passes through the holes in the shell 41 due to the impact force generated by exiting the sleeve 44 and hitting the wall of the shell 41 .

At the wall of the shell 41 the suspension is affected by the swell effect of the gas entering the shell 41 from the barrel 42.

The solid particles, together with the remainder of the liquid phase, also form a swall due to this swall.

Centrifugal force is generated within this swall flow, which forces particles and liquid against the inner surface of shell 1.

The pressure of the gas and suspension flow increases on the inner surface of the shell 41 relative to the pressure on the outer surface of the shell 41, so that the liquid between the solid particles exits the outer surface through the holes of the shell 41 and flows by gravity to the bottom plate 39 and to the sleeve 52. released from.

The part of the gas that has passed through the shell 41 is the sleeve 50.
released from.

The particles containing a small amount of liquid are passed along with most of the gas into the annular insert 48 where they strike the vanes of the swaling means 49 and are spooled again.

The gas, together with the particles and the liquid phase, passes from the insert 48 back to the surface of the shell 41, where the separation process as described above takes place. However, a larger portion of the gas will now pass radially through the particle bed, carrying the remaining portion of the liquid phase by the dynamic head of the flow. The liquid phase is discharged from the bottom 37 through the sleeve 53 and the gas is discharged from there through the sleeve 51.

The particles separated from the liquid fall freely and fall into the sleeve 4.
Released from 7.

This method effectively solves the problem.

Implementation of the method of the invention in a device having the same overall capacity as a conventional separation device will significantly reduce power consumption, reduce the manufacturing costs of the device, make its manufacture and maintenance as easy and simple as possible, and improve its operation. It is possible to increase the reliability of the particles and the quality of the particles obtained.

For example, if the present device is applied to the separation of a polyethylene suspension using water as the liquid and a supply capacity of dry polyethylene of 1 t/h, the following conditions will be met. Housing outer diameter - 0.3m, housing length (without sleeve) - 0.6m, device weight - approx. 20Kg,
Blower capacity - up to 1Kw. The moisture content of the polyethylene particles at the outlet of this device is within 0.1%.

〔Effect of the invention〕

Furthermore, by including a swale of gas, the pressure of the suspension is higher at the inner wall of the shell than at the outer wall. This causes the liquid phase to pass through the shell. The swirling action of the gas and suspension also creates centrifugal force inside the shell, which forces the liquid phase through the shell. The amount of liquid carried with the particles is reduced by evaporation of some of it from the particle surface upon contact with the gas.

The particles form a layer one particle thick on the inner surface of the shell. On the other hand, the particles in suspension are vigorously agitated to more completely remove liquid from the gaps between the particles. This reduces the amount of liquid removed with the particles.

The proportion of liquid at the exit of the shell is reduced by the gas flow being continuously passed through the layer of particles on the inner surface of the shell due to centrifugal force and the pressure difference between the inner and outer walls of the shell.

This device allows the method of the invention to be carried out most efficiently.

The means for gas swaling creates a greater resistance to the flow of gas and suspension, which increases the pressure differential inside and outside the shell. This allows more liquid phase to pass through the pores of the shell.

By this means it is possible to impart rotation to the flow of gas and suspension to further increase the centrifugal force acting thereon.

[Brief explanation of drawings]

1 is a schematic diagram of an apparatus for carrying out the method of the invention, FIG. 2 is a diagram showing the apparatus of FIG. 1 in an embodiment with two gas inlet sleeves, and FIG. 3 is a diagram of the apparatus of FIG. A diagram showing an embodiment in which a spiral vane is provided on the outside of the shell of the embodiment, FIG. 4 is a cross-sectional view taken along the - line of FIG. 3, and FIG. FIG. 6 shows an embodiment in which the gas discharge sleeve is connected to the gas inlet sleeve through the blower; FIG. Figure 7 is a diagram showing the embodiment as it is arranged.
Figure 2 shows an embodiment in which the housing of the illustrated device is constructed in two parts, with a suspension inlet sleeve along the axis of the shell and a conical flow divider at the outlet of the sleeve; 1,41...Perforated shell, 2,34...Casing, 4...Housing cover, 5,27,4
4...Suspension inlet sleeve, 6...Cover, 7,
22, 23, 25... Piping, 8... Flange,
9, 32, 46... Gas inlet sleeve, 9a...
Clearance, 10,48... annular insert,
11, 31, 52, 53...liquid release sleeve,
12, 50, 51... gas release sleeve, 13...
... Bottom plate, 14, 16, 26, 47 ... Particle release sleeve, 15, 45 ... Conical flow divider, 17, 17
a, 19...Swaling device, 20...Blade,
21...Second gas release sleeve, 24...Blower, 29...Slit, 30...Casing, 3
3...Tangential gas inlet hole, 36...Top housing, 37...Bottom housing, 38...Top cover, 39...Top housing bottom plate, 40...Bottom housing bottom plate, 42...Barrel, A...Gas Flow, B... Gas flow rotation direction.

Claims (1)

[Claims] 1. A suspension is sent to a stationary shell 1, a centrifugal force is applied to the suspension to cause the liquid phase to pass through the perforated shell 1, and solid particles are removed from the perforated shell 1 and suspended. A method for separating a suspension into a liquid phase and solid particles, characterized by introducing a gas swirl flow into the perforated shell 1 to generate centrifugal force. Method. 2 The gas swall flow has a peripheral velocity of 20 to 50
2. A method according to claim 1, wherein the speed is m/s. 3. Said swale stream of gas is passed through said perforated shell 1 as two streams, one of said two streams having a temperature of 0 to 40°C and the other above 40°C and downstream of said one stream said 2. A method according to claim 1, characterized in that one flow passes through the perforated shell (1) in the same direction. 4. The gas fed to the perforated shell 1 is such that it contains vapor, and the suspension consists of a crystalline material and a saturated solution thereof in a liquid phase.
The method described in section. 5. A solvent is introduced into the suspension before it is sent to the perforated shell 1, and the suspension consists of a crystalline substance and a saturated solution thereof in a liquid phase. The method described in paragraph 1. 6 Consists of a housing 2 with an outlet sleeve 11 for the discharge of a liquid phase and a perforated shell 1 placed within this housing 2 at a distance from its wall, said shell being suspended at one end of said perforated shell. Inlet sleeve 5 and perforated shell 1 for conveying the turbid liquid
at the other end an outlet sleeve 14 for discharging solid particles, and furthermore means 1 for introducing gas into said shell and swalling said gas.
at least one inlet sleeve 9 including 7;
an outlet sleeve 12 for discharging the gas from the housing 2. A device for separating suspensions into a liquid phase and solid particles. 7 The gas wall means 17 is connected to the sleeve 9 for introducing the gas into the perforated shell 1.
7. A device according to claim 6, characterized in that it is a number of stationary vanes provided at the outlet of the. 8. Spiral vanes 20 are provided on the outside of the shell between the perforated shell 1 and the wall of the housing 2, and these vanes 20 are inclined toward the perforated shell in the swal direction of the gas flow. The device according to claim 6. 9 The housing 2 has another outlet sleeve 21 for gas release, which communicates with the interior space of the perforated shell 1 and connects with the gas release sleeve 12 to the sleeve 9 to allow the gas to pass through the perforation. 7. A device according to claim 6, wherein the sleeves 12 and 21 are connected to the sleeve 9 via a blower 24. 10 Suspension introduction sleeve 27 at its outlet end 28
The sleeve has a longitudinal slit 29, and the part with the slit 29 is arranged in a casing 30, which is fitted with an outlet slit 31 for the discharge of the liquid phase, and the sleeve has a longitudinal slit 29. 7. Device according to claim 6, characterized in that the introduction sleeve (32) is arranged upstream of the slit (29) in said sleeve (27). 11. A housing 34 is provided, consisting of at least two tandemly arranged parts 36, 37;
A solid annular insert 48 connects the perforated shell 4 at the junction of the parts 36, 37 of the housing.
1 , the insert is adapted to accommodate means 49 for swaling the flow of suspension and gas in contact with the bottom plate 39 of the first portion 36 of the housing 34 , the suspension introduction sleeve 44
is arranged coaxially with the longitudinal axis 35 of the perforated shell 41 and a conical flow diverter 45 is arranged coaxially with the longitudinal axis 35 of the perforated shell 41 and
4, the flow dividing device faces the sleeve 44 at its apex, and a gas introduction sleeve 46 connects the housing 34 upstream of the outlet end 44a of the sleeve 44.
, wherein each portion 36, 37 of said housing 34 has a sleeve 50, 51 for gas release and a sleeve 52, 53 for liquid phase release. Apparatus according to scope 6.