Dispensing – With gas agitation
Patent
1995-01-09
1996-11-19
Huson, Gregory L.
Dispensing
With gas agitation
B65G 6906
Patent
active
055754066
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
In the case of bulk-material silos with base ventilation, the loosening air or a considerable part thereof has to escape through the silo draw-off opening together with the material. This results in a considerable pressure difference and high speeds prevailing at the draw-off opening. Non-uniform movement of the material within the silo may also result in a non-uniform draw-off. The resulting difficulties are controlled by using a so-called expansion chamber, this being a chamber which is of a considerable volume and considerable height and is provided directly downstream of the silo outflow opening. In this chamber, the material discharged out of the silo is relieved from the silo pressure and the excess air is led away before the material passes the draw-off members. The precondition for the expansion of, and air extraction from, the material is an expansion-chamber height which is greater than the height of expansion rise of the material which passes in the fluidized state out of the silo into the expansion chamber. The height of expansion rise is determined, in accordance with the principle of communicating pipes, by the pressure by which the material passes out of the silo into the expansion chamber. This height is usually in the region of from 4 m to 10 m. The column of material in the expansion chamber gives the excess air opportunity to escape, with the result that a level of material above which the excess air can be drawn off forms in the upper space of the expansion chamber. An important factor for the expansion action is that the expansion chamber follows on directly from the silo outflow opening, in order that the expansion takes effect directly at the silo outflow opening and that there is no counter-pressure, obstructing the outflow, as a result of high flow resistances. In the case of known configurations, this has resulted in the outflow chamber being arranged within the silo region in the main silo space (FR-A-2 350 288, GB-A-20 74 549) or beneath the silo base (EP-A-400 331). This requires a high degree of structural outlay.
SUMMARY OF THE INVENTION
The invention avoids these disadvantages by providing a silo for storing, fluidizing and discharging bulk material wherein the silo comprises a storage chamber having a ventilated base contoured to slope toward its center, a dual-stage expansion chamber, a dust extraction device and a storage chamber extraction line extending from the top of the storage chamber to the dust extraction device for conveying air therealong from the top of the storage chamber to the dust extraction device. The dual-stage expansion chamber has primary and secondary portions as well as an inlet for connecting the primary portion to the storage chamber at the center of its ventilated base. The secondary portion of the expansion chamber is positioned outside the storage chamber and the primary portion of the expansion chamber extends from the inlet toward and merging with the secondary portion. The expansion chamber includes a device for fluidizing the bulk material therein, while the secondary portion of the expansion chamber is provided with a height and volume in excess of that occupied by the fluidized bulk material, thereby providing a free space above the fluidized material. The dust extraction device is operatively connected with the free space for drawing off excess air and extracting dust therefrom. The base of the expansion chamber advantageously slopes downwardly toward a draw-off device that is operatively associated with the expansion chamber for receiving the bulk material therefrom. Preferably, the primary portion of the expansion chamber enlarges as it extends toward the secondary portion to provide space for expansion of the bulk material as it is fluidized.
Dividing the expansion chamber up into two parts can have the result that the expansion effect takes effect directly at the draw-off opening of the silo. It also has the effect that the part of the expansion chamber which is expensive due to its height is positioned
REFERENCES:
patent: 4236852 (1980-12-01), Krauss
patent: 4382723 (1983-05-01), Moller
patent: 4417832 (1983-11-01), Kraus
patent: 4692068 (1987-09-01), Hanrot et al.
Claudius Peters Aktiengesellschaft
Huson Gregory L.
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