FR2527179A1 - SILO WITH MIXING CHAMBER FOR BULK MATERIALS - Google Patents

Abstract

A. THE INVENTION RELATES TO A MIXING CHAMBER 3 SILO FOR BULK MATERIALS, THE MATERIALS BEING MIXED BY CIRCULATION IN THIS CHAMBER AND BEING TAKEN BY A RADIAL DUCT 4. B. THE SILO IS CHARACTERIZED IN THAT THE BULK MATERIALS S 'FLOW TOWARDS DUCT 4 THROUGH AN UPPER OPENING 8 ARRANGED UNDER THE COVER OF MIXING CHAMBER 3. C. THE INVENTION IS APPLICABLE TO THE STORAGE AND HOMOGENIZATION OF BULK MATERIALS, AND CONSISTS OF AVOIDING SHORT FLOWS CIRCUIT.

Description

"Mixing chamber silo for bulk materials".

  The invention relates to a silo with a mixing chamber for bulk materials, the mixing chamber being placed centrally on the bottom of the silo, the bulk materials being fed to this chamber.

  from the silo volume, above the bottom, by government

  pneumatic feeders, the bulk materials being mixed by circulation in this chamber and taken by a duct extending radially to the

outer wall of the silo.

  Such silos are used to store bulk materials and to save homogenization silos

  in which the fluc-

slaughter of the production.

  French patent 70 39 327 describes a silo of this type in which the extraction device is connected to the center of the mixing chamber. By means of an axial tube, the mixing chamber is dusted upwards and emptied downwards. An additional emptying takes place by means of this tube in the upper part of the chamber. The bulk materials are then conveyed towards the lateral discharge by a lower passage arranged

  under this silo In this realization, it is necessary to

  see an expensive central column for the building element. The silos according to the documents DT-OS 26 57 596 and OS 26 57 597 do indeed include an advantageous lateral discharge by means of a duct directed towards the wall of the silo, this duct ending at the top at the level of the chamber and serving to carry out dust removal to a dedusting tube advantageously disposed on the outer wall of the silo In both cases, the lateral duct is separated from the mixing chamber by an intermediate wall The mixing chamber is dusted by an opening in this wall below of the cover An opening made in this wall

  separation, at its lower part, ensures the flow of

  Bulk materials in the side duct The bulk material discharge spe and the side duct fill height is a function of the

  section of this aperture and the power of extrac-

silo.

  It is therefore not excluded that the bulk materials flowing from the silo through the inlet openings of the mixing chamber pass in part by the shortest path to the lateral duct and do not participate

  not homogenization in the mixing chamber.

  The object of the invention is to prevent this flow of short circuit in a mixing chamber silo with

  a duct extending radially to the wall of the silo.

  To this end, the invention relates to a silo of the type

  characterized in that the bulk materials are

  slow to the duct through an upper opening

  under the chamber cover Bulk material flowing from the silo volume must pass into the mixing chamber at least vertically

  or diagonally before reaching the lateral duct

  ral They are then surely taken in the homogenisation

  By mixing and mixing with the other bulk materials in the mixing chamber the mixed final bulk material is thus more homogeneous, i.e. the amount of change of the materials in question.

  final bulk is reduced, because the aber-

  Individual rants, which come from short-circuit flows, are removed. The invention ensures that an obligatory path has the greatest possible distance between the openings

  entering the mixing chamber and the outlet of the machines.

  bulk chamber in the side duct can also reduce the air flow of the fan

  acting in the homogenisation plant of the chamber

  mixture because the circulation speed is no longer

  to the necessary homogenisation and no longer to the

  fast flow of loose bulk materials.

  An improvement is obtained in that the lower edge of the flow opening of the mixing chamber in the duct is adjustable in height. Thus, it is not necessary to always fill the mixing chamber according to the maximum filling height. ,

  until the bulk material runs off too much

  In this way, it is thus possible to adapt during operation the overflow flow height to the filling height.

  the most judicious of the mixing chamber, with which

  a good result of mixing is obtained.

  A lower filling height of the chamber

  mixture immediately leads to an energy saving.

  This is because the existing fan must then apply a lower pressure and, in the case of electrical control, the drive motors take less power. The filling height of the mixing chamber

  is influenced by the flow of arrival and the flow of

  Loose material discharge The discharge rate of bulk materials through the lateral duct is a function of need and is therefore variable.

  ensured by a constant filling height of the con-

  Due to a particular characteristic of the invention, this filling height is controlled by a measuring device which controls the ventilation of the bottom of the silo outside the mixing chamber and thus guarantees the height. of

  filling in the mixing chamber as well as the

uniformly in the duct.

  By this command, the ventilation expense for the bottom of the silo outside the

  room at a minimum value required.

  In case the lateral evacuation of the silo is not

  would not see on the bottom but above, the bottom of the duct

  is placed higher than the bottom of the mixing chamber.

  With this achievement, we can also ensure the

  tilation of the bottom of the chamber with a lower pres-

  of ventilation and thus still obtain an economic saving

energy.

  It is also expected that the mixing chamber has on its bottom a second discharge opening through which the bulk materials are removed With this opening, it creates an emergency exit in case of failure It gives the possibility to perform a drain complete and can be removed from below the large pieces of bulk materials that separate in the mixing chamber. A particularly simple construction method is obtained in that the front link of the second sampling location extends to the bottom of the mixing chamber

below the duct.

  The invention will be better understood with regard to the

  following description and the attached drawing representing

  an example embodiment of the invention In this drawing,

  the single figure is a sectional view of the inferior part

  of a silo according to the invention.

  The lower part of a bulk material storage silo is bounded by the outer wall 1

and the bottom 2.

  On the bottom of this silo, a mixing chamber 3

  is disposed in a central position A conduit 4 is dis-

  placed between this chamber and the outer wall of the silo.

  This duct 4 is separated from the mixing chamber 3 by a wall 5 The bulk materials contained in the silo arrive in the mixing chamber 3 by the volume 6 of the silo and the opening 7 In this chamber, they are

  mixed by a process of homogenization by four

  An active quadrant is heavily ventilated and three inactive quadrants are poorly ventilated Bulk materials are circulated The ventilation of the quadrants is changed in time, so

  that each quadrant is active in turn.

  Going through the opening 8, the bulk materials arrive in the duct 4 and the air of dusting goes

  to the dedusting line 9.

  A measuring device 10 palpates the level of

  pleating of the chamber 4 and control the fan 11.

  The extraction of bulk materials takes place through an opening 12 The second sampling location in

  the mixing chamber is constituted by an opening 13.

Claims (1)

CLAIMS) A mixing chamber silo for bulk materials, the mixing chamber (3) being arranged centrally on the bottom (2) of the silo, the bulk materials being fed to this chamber from the silo at - above the bottom, by pneumatic conveyor chutes, the bulk materials being mixed by circulation in this chamber and taken by a duct (4) extending radially to the outer wall of the silo, characterized in that the bulk materials flow to the duct (4) through an upper opening (8) arranged under the cover of the mixing chamber (3). Mixing chamber silo according to claim 1, characterized in that the edge of the flow opening (8) is adjustable in height. Mixing chamber silo according to either of Claims 1 and 2, characterized in that the filling height is controlled by a measuring device (10) which controls the ventilation of the bottom of the silo. outside the mixing chamber (3). Mixing chamber silo according to any one of claims 1 to 3, characterized in that the bottom of the conduit (4) is placed higher than the bottom of the mixing chamber (3).   50) Mixing chamber silo according to any one   as in claims 1 to 4, characterized in that the   mixing chamber (3) has on its bottom a second discharge opening (13) through which the bulk are collected.   6) Mixing chamber silo according to one or the other   claims 4 and 5, characterized in that the link   transporting sound from the second sampling location extends from the bottom discharge opening (13)   of the chamber, below the duct (4).