Classifying – separating – and assorting solids – Plural – diverse separating operations – Gaseous suspension and stratifying
Patent
1982-08-12
1984-12-25
Lacey, David L.
Classifying, separating, and assorting solids
Plural, diverse separating operations
Gaseous suspension and stratifying
209135, 209137, 209143, B07B 700
Patent
active
044902476
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to separating apparatus, and more particularly to an air stream separator, for example for separating chips or biomass from heavier material.
In air stream separation, the material to be separated is introduced in mixed condition into an air stream, whereby the material is divided into fractions, of which the lightest material follows along furthest in the air stream direction. In the initial phase of separation, i.e. when the material is being introduced into the separating air stream, the material behaves in unsorted manner, and after having been passed through a certain distance, a heavier fraction, for example, has been separated from other fractions. The distance, through which the material is unsorted, can be relatively long. This is a disadvantage, because the air stream separating installation must be designed with greater dimensions.
When the starting material, from which, for example, stones and metal particles are to be separated, consists of a lot of particles having about the same size and density, heavy particles can be separated by air stream separation and by using known art, without affecting the particle distribution of the material.
When, however, the light phase consists of a mixture of particles having varying density and/or size, air stream separation carried out according to known art results in the light phase being separated in such a manner that particles with similar properties are gathered together. A starting material in which particles with different properties are well mixed, thereby is converted into a material partially classified with respect to size and/or density. In many industrial processes it is desirable that the material be well mixed. Air stream separation according to known art, therefore, produces the disadvantage, that chips, from which, for example, stones have been removed after the separation are divided into fractions of similar fragment size.
It is also desirable to separate stones and other heavy impurities from biomass, which itself includes heavy fractions, such as stump parts, branch parts etc.
SUMMARY OF THE INVENTION
The present invention solves the aforesaid problems and offers an apparatus, which according to one embodiment provides a well-mixed air stream separated material, and according to one embodiment also achieves air stream separation of biomass.
The present invention relates to an air stream separator for separating a heavy fraction, for example stones, from a mixture of light particles with different properties, for example chips, comprising a conveyor and a fan or the like, of which latter an air nozzle located at the output end of the conveyor provides an air stream directed upward and forward in the conveying direction of the conveyor. The conveyor a so-called vibrating conveyor, in which the heavy fraction collects on the conveyor bottom. An additional vibrating conveyor is located in the conveying direction after the output end of the first conveyor and on the same or a lower level. The second conveyor includes an upwardly inclined portion at its input end which leads into a portion in parallel with the main conveying direction of the first conveyor. The inclined portion is located in relation to the output end of the first conveyor, to enable heavy fractions to drop down on the inclined portion and be conveyed downward.
BRIEF DESCRIPTION OF THE DRAWING
The invention is described in greater detail in the following, with reference to the accompanying drawings, in which:
FIG. 1 is a longitudinal section of an air stream separator according to a first embodiment of the invention,
FIG. 2 shows a portion of FIG. 1, into which particle paths have been plotted,
FIG. 3 is a longitudinal section of an air stream separator according to a second embodiment of the invention,
FIGS. 4 and 5 show modified portions of the separator shown in FIG. 3 illustrating two additional embodiments thereof, respectively,
FIG. 6 is a cross-section of a rocking chute according to one embodiment,
FIG. 7 show
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patent: 4191294 (1980-03-01), McGrath, Jr. et al.
patent: 4219410 (1980-08-01), Herder
Forsberg Lennart G. K.
Moberg Per-Ingvar
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