| 摘要 |
1,211,292. Pneumatic separation. E. I. DU PONT DE NEMOURS & CO. 15 FFeb., 1968 [17. Feb., 1967], No. 7556/68. Heading B2H. A gas-entrained mixture of regularly-shaped particulate solids and particulate adulterants flowing, through a conveyor line 10, 10a is separated into its components by a separator inserted in the conveyor line and comprising a first expansion chamber 11 in which the gas velocity is reduced below the minimum floating velocity of the adulterants a second expansion chamber 12 in which the gas velocity is reduced below the minimum floating velocities of both adulterants and particulate solids and which is of greater cross-section than the first chamber and of such a length that, when the gas-entrained mixture enters it, the adulterants are separated out from the gas stream and fall into a trap 16 at the bottom of the chamber whereas the particulate solids due to their inertia are carried towards the outlet end of the chamber, and a double-coned member 20 which deflects the gas stream to effect final separation of any entrained adulterants and which defines with a reducer 17 at the outlet end of the chamber a flow-acceleration passage for the particulate solids leaving the chamber 12 with the gas stream. The reducer 17 may be connected to the section 10a of the conveyor line either directly or, as shown, via a duct 18. The gas velocity in the different parts of the apparatus, and hence the degree of separation, is adjusted, by a manually operable gas flow regulating valve 24 incorporated in a by-pass line 23 connected between the conveyor line portion 10 and the outlet end of duct 18. |
