FR2468403A1 - FLUIDIZED BED DEVICE - Google Patents

Abstract

A fluidized bed device comprising an inlet device, a channel-shaped bed for a fluidized bed and an outlet device. An adjustable bypass device 9 diverts a portion of the particles, from the path 8 to a location 10 and leads them back to the path 8 at a location II, in the area of the fluidized layer 3, located downstream in the direction of passage of the particles of solid matter to be treated. By adjusting the bypass, the fluidized bed device can be adapted to changes in the temperature of the air serving to establish the fluidized bed or to changes in temperature of the particles to be treated. This device can be used in pulverulent material treatment techniques.

Description

The present invention relates to a fluidized bed device in which

  particles of solid matter to

  in a fluidized bed travel on a similar path

  taking an input device for the solid particles to be treated, a channel bed for the fluidized bed and an output device for said treated particles. Such fluidized bed devices can be used to cool hot solid particles to the desired temperature. For this purpose, ambient air is advantageously used to establish the fluidized bed and

  for cooling the particles in said layer.

  In certain climatic conditions, however, the ambient air temperature may vary by approximately 300C

  during a day. If the input temperature of the

  It remains unchanged and the exit temperature of the particles must remain invariable throughout the day, so during the day the surface of the bed must be four times greater. Fluidized bed devices of different sizes should be alternately used where the ambient air must be cooled to a temperature that is kept constant before it enters the system.

  the fluidized bed device, by means of an apparatus for

  froidissement. Both solutions are very expensive.

  It is an object of the present invention to provide a fluidized bed device that can adapt to changing air temperature ranges for fluidized bed or variable temperature ranges of

  particles of solid material to be treated.

  This problem is solved according to the present invention by providing an adjustable bypass or bypass device which deflects at least a portion of the solids particles to be treated, from the path to a location, and carries them back to the path at a point in the path. zone of the fluidized layer which is located further downstream in the direction of movement of the solid particles to be treated. To simplify the by-pass device, it is advantageous for the channel or channel bed to extend so that the bypass location and the feed location are located adjacent to the channel. other. It is advantageous that the channel-shaped bed is also in the form of a U. It is even more advantageous that the bed in the form of a channel

also be circular.

  A specially simple device is obtained when the bypass location and the supply point are in the fluidized bed zone and when the bypass device has an adjustable dam for the particles.

  of solid matter held in the fluidized bed.

  It is also advantageous to locate the bifurcation in the area of the input device of the particles of matter

solid to treat.

  Lice get an important control area it is

  advantage that the diversion zone, in the sense of

  the particles to be treated, is at the latest at the beginning of the fluidized bed, and the place of supply at the end

of said layer.

  An advantageous device according to the present invention is produced when the bypass device comprises a pivoting inlet channel for the particles of solid material to be treated and a double slide located between

  the beginning and the end of the fluidized layer.

  The invention will be described hereinafter by means of several

  two nonlimiting exemplary embodiments, with reference to the appended drawings, in which: FIG.

fluidized bed.

- Figure 2 is

II-II of Figure 1.

- Figure 3 is

III-III of Figure 1.

- Figure 4 is

positive fluidized bed.

- Figure 5 is

fluidized bed device.

- Figure 6 is

VI-VI of Figure 5.

- Figure 7 is

VII-VII of Figure 5.

  a top view of a device a sectional view along the line a sectional view along the line

a view from above of another disc

  a top view of another a sectional view along the line a sectional view along the line the corresponding parts are called by means

  same reference numbers in all figures.

  the fluidized bed device shown in FIGS. 1 to 3 comprises an inlet or feed device 1 for the particles of solid material to be treated, a bed in the form of a channel or gutter 2 for a fluidized bed 3 and an outlet device 4 for the solids particles treated. The channel-shaped bed 2 has a bottom having passage holes for the air and below which is disposed a casing 6 for supplying air. A pipe system 7 brings to the housing 6 the necessary air

to establish the fluidized bed 3.

  A path 8 for the particles of solid material to be treated corresponds to the section line II-II shown in FIG. 1 and it includes the input device 1, the bed

  in the form of a channel 2 for the fluidized layer 3 and the arrangement

  Exit 4 for the treated solids particles. A bypass device 9 deflects part of the particles to be treated, from the path 8 to a location 10 and leads

24684O!

  this part of the particles at the path 8 at a location 11 situated further downstream with respect to the direction of flow

  particles of solid material to be treated.

  While the non-derived portion of the particles to be treated travels the entire path 8, the deflected portion of said particles travels only a fraction of this path 8. The average time of treatment of the particles of solid material in the layer in the fluidized layer can therefore be modified within a wide range. On the other hand, a perfect mixture of the solid particles having a long treatment period and particles having a short treatment period takes place at the location 11, so that the particles all leave the fluidized bed device by the device. exit 4, at the same

  temperature and according to a homogeneous current.

  The bed in the form of channel or channel 2 extends so that the place of diversion 10 and the place of supply 11 are adjacent, that is to say that the channel-shaped bed has the shape of a U. It could however be,

  for example, circular as shown in Figure 4.

  The bypass location 10 is located in the zone of the fluidized layer 3 and the bypass device 9 comprises an adjustable dam 12 for the particles of

  solid material held in the fluidized bed 3.

  In the embodiment illustrated in FIGS. 7, the deflection place 10 is in the zone of the input device 1 of the solid particles to be treated. The bypass or bypass device 9 comprises a pivoting inlet channel 13 for the particles to be treated; it opens onto a double slide 14 located between the beginning and the end of the fluidized layer 3. The slide 14 is shown in FIGS. 5 and 7, while at the

  figure 6 only its position is indicated, in dotted lines.

  By the pivoting of the arrival channel 13, the arrangement

  Input 1 can dispense the particles to be treated, in the desired proportion, on the total path and on the

by-pass device.

  The bottom 5 of the bed 2 is lower at the feed point 11 of the solid particles than the bottom 5 in the zone of the bed 2, close to, that is to say, preceding the feeding place 11 As a result, the fluidized bed 3 is so high, at the feeding point 11, that the particles of solid material which pour into it can not strike the bottom 5. The point of incidence at the beginning of the fluidized layer 3 is also provided with a bottom which is lower than

the other portion of bed 2.

  In all embodiments, the deflection point 10 is located at the latest at the beginning of the fluidized layer 3 and the feed location 11 at the end of said

  layer 3, so that the adjustment zone is very important.

  The bypass device 9 can be adjusted by means of a device not shown. The inlet temperature or the outlet temperature of the particles of material to be treated, or the inlet temperature or the outlet temperature of the air used to establish the fluidized bed serve as control parameters, and when a modification of these temperatures the portion of the particles to be treated

  in the bypass is then increased or reduced.

  If the fluidized bed device serves, for example to cool the particles of solid material to be treated, to ensure a temperature jump of constant value (inlet temperature and outlet temperature of the particles to be treated), the adjusting device can increase the portion of the particles to be treated conducted in the bypass, if the

  output temperature of the particles drop, and vice versa.

Claims (6)

  1 - Device with a fluidized bed, in which particles of solid material to be treated travel in a fluidized bed a path which includes an input device of the particles to be treated, a bed in the form of a channel or channel for the fluidized layer and a device output device for the treated solid particles of particles, characterized in that it comprises an adjustable bypass or bypass device (9) which deflects at least a portion of the particles of solid matter to be treated, from said path (8) to a location (10), and carried back to said course or path at a location (11), in the region of the fluidized layer (3), which is located further in the direction of movement of the particles to be treated.  2 - Device according to claim 1, characterized in that the channel-shaped bed (2) extends so that the place of diversion (10) and the place of supply (11)   are located close to each other.   3 - Device according to claim 2, characterized in that the channel-shaped bed (2) is in the form of a U. 4 - Device according to claim 2, characterized   in that the channel-shaped bed (2) extends circularly.   Device according to claim 1, characterized in that the bypass location (10) is in the region of the fluidized bed and the bypass device (9) has an adjustable dam (12) for particles   of solid matter held in the fluidized bed (3).   6 - Device according to claim 1, characterized in that the bypass location (10) is in the area of the input device (1) particles of matter solid to treat.   7 - Device according to claim 1, characterized   in that, in the direction of passage of the particles to be treated, the diversion point (10) is at the latest at the beginning of the fluidized layer (3) and the feed point (11) at the end of said layer. 8 Device according to claim 6, characterized in that the bypass device (9) comprises a pivoting inlet channel (13) for the particles to be treated, and opens on a double slide (14) located between the   beginning and end of the fluidized layer (3).   9 - Device according to claim 1, characterized in that the bottom (5) of the bed (2) is lower at the point of supply (11) of the particles of solid material than the bottom (5) in the area of the bed (2) next to the place of supply (11).