FR2524439A1 - DEVICE FOR LIFTING AND COOLING A DIVIDED MATERIAL WITH VARIABLE GRANULOMETRY - Google Patents

Abstract

1. Device for lifting and cooling a finely divided material whose granulometry spreads over a wide range, characterized in that it is constituted by a column (1) provided at its base with a fluidization grate (2), under which is provided an air-chamber (3) whose upper part communicates with a collector (5) for the material, with admission means (4) for the material placed above said grate (2) and with a central transfer tube (6) whose base (6a) is situated at an adjustable distance (d) from a gas injecting nozzle (7) directed towards the tube, said central tube emerging into an auxiliary collecting and speed reducing chamber (8) itself being connected to said collector (5).

Description

Device for lifting and cooling a divided material

with variable grain size.

  Cooling and transporting a di-

  aimed end can be achieved in several different ways and in particular by the technique of fluidized beds This technique implies on the one hand that the particle size of the product is maintained in a very narrow range and on the other hand that the transit is substantially horizontal We can realize an elevation of the product at the same time as a cooling is by means of a pneumatic transport on condition that, here also, the particle size of the product

  either contained within a very tight range, or by means of

  mechanical positives such as inclined cooling screws or drums

  These latter devices allow you to convey a pro-

  due to irregular grain size but their size is

  often very important, which limits their possibilities of being ins-

  talled in very compact treatment units.

  The present invention intends to provide a solution to the

  problem of elevation and concomitant cooling of a pro-

  divided product whose particle size spreads over a wide range.

  To this end, the invention therefore relates to a device

  pneumatic type of elevation and cooling which allows

  to have it in the form of a column having a very small encom-

  brement on the ground while allowing to reach significant heights.

  According to one of the essential characteristics of the invention, this dis-

  positive is constituted by a column provided at its base with a fluidization grid, under which is provided a wind boot, an inlet of the material above said grid and a central tube whose base is located at a certain adjustable distance from a nozzle

  air injection towards the tube.

  In addition, the aforementioned column communicates at its upper part with a product collector while the central tube opens into an auxiliary sensor and retarder itself connected to said collector. Preferably, the aforesaid nozzle is guided relative to the fluidization grid. free above and is a means of adjusting the distance between it and the base

of the central tube.

  Finally, note that the outer wall of the column

  is equipped with a cooling system which can be sprayed

  rization of water while the central tube can also be fitted

  a separate cooling system.

  The invention will be better understood during the description given below by way of purely indicative example and not

  limiting which will make it possible to draw out the advantages and

secondary characteristics.

  Reference will be made to the accompanying drawings, in the-

  which Figure 1 is a block diagram of the invention

  Figure 2 is a detail view of Figure 1.

  Referring first to Figure 1, we see a column 1 at the base of which a perforated plate 2 separates the interior volume la from the column of a wind boot 3 connected to a source of compressed gas not shown This perforated plate constitutes a fluidization grid above which, by a conduit 4, the divided product to be raised and cooled is brought in. The upper part of the column 1 is in communication in a manner not shown with a manifold 5 situated at the desired altitude Ce

  collector can be of the cyclone or other known type.

  In the center of column 1, a transfer tube 6 has been placed, the base 6 a of which communicates with the internal space la of the

  column This base 6 a is located at a distance d from a nozzle 7 of

  jection of an air stream in the tube The upper end 6 b of the tube 6 opens into an auxiliary sensor 8 which also acts as a retarder and which is itself connected to the main manifold The representation of the nozzle 7 is quite quite schematic It should be easily accessible to adjust said distance d but also its diameter and its location relative to the grid 2 It may also be interesting that the tube 6 is

  mobile if you want to change the distance d above in another way

said.

  Finally, in this figure, we see an annular pipe

  slide 9, the lower part of which is provided with spray orifices

  sation of a liquid (water) for cooling the wall of the co-

  lonne 1, this water being collected by an annular tank 10 of straight

  swimming We symbolized in 11 a separate cooling device

of tube 6.

  In FIG. 2, which is a detailed view of an embodiment of FIG. 1, at the level of the fluidization grid and of the tube 6, we find some of the elements already described with the

  same references We see in this figure that the nozzle 7 is axia-

  Lely aligned with the tube 6 (guides 12 keep this alignment) It puts in direct communication the wind boot 3 with the inside of the column As the pressure drop of the nozzle is much lower than that of the grid 2, there is a flow of air or gas which reaches the bad 6a of the tube 6 by creating

  an aspiration of the ambient atmosphere around elements 6 and 7.

  By adjusting the distance d between the end of the nozzle and the end

  mite from the tube 6, the suction effect and therefore the role of the tube 6 are adjusted. This adjustment is advantageously carried out by mounting on the grid 2

  nozzles of different axial lengths You can also supply

  lie nozzle 7 by a source of compressed air independent of the

  wind boot We can also plan without going beyond the scope of the

  vention any other nozzle system 7 accessible directly from the former

  the diameter of which can also be varied

  for adjusting the operation of the device.

  The product brought to the grid 2 being of a granulo-

  metry distributed in a wide range (according to a distribution of gauss in particular) the pressure of the wind boot is adjusted so that the main part of the grains is transported pneumatically

  in column 6 at a speed determined by the cooling rate

  but the heavier particles tend to stay in the space there, or even to concentrate at the level of the grid 2 The suction effect described above creates a sweeping of this space. enough force to drive these particles

  heavy which are quickly propelled into the auxiliary sensor 8.

  For these heavy particles, the transfer is carried out at the expense of cooling, which can then be compensated

  if necessary by more vigorous cooling in It or in extension

  managing the length of the transfer channels In any event, the percentage of particles concerned remains low compared to the

  whole product, the calorific incidence can be neglected.

  The invention finds an interesting application in

  the field of processing finely divided materials.

Claims (4)

R E V E N D I C A T I O N S   1 Device for raising and cooling a material   finely divided stream, the particle size of which extends over a large range, characterized in that it consists of a column (1) provided at its base with a fluidization grid (2), under which a wind boot ( 3), an inlet (4) of the material above said grid (2) and a central transfer tube (6) whose base (6 a) is located at a certain distance d adjustable by a   gas injection nozzle (7) towards the tube.   2 Device according to claim 1, characterized in that the aforesaid column (1) communicates at its upper part with a collector (5) of the product while the central tube (6) opens into a sensor (8) and auxiliary retarder itself even connected audit collector (5).   3 Device according to claim 1 or claim 2, characterized in that the aforesaid nozzle (7) is carried by the above-mentioned fluidizing grid (2) and constitutes a means of adjusting the distance (d) separating it from the base (6 a) of central tube (6).   4 Device according to any one of claims   previous, characterized in that the outer wall of the column   (1) is equipped with a cooling system (9, 10).   Device according to any one of the claims   previous, characterized in that the central tube (6) is equipped   an independent cooler (11).