| 摘要 |
715,354. Pneumatic separating. DORR CO. Feb. 15. 1952, No. 4079/52. Class 117 [Also in Group XIII] Apparatus for pneumatically drying and classifying granular material comprising a chamber 10 with a perforated plate 16 on which is supported a fluidized bed of granular material and through which pass gases from a plenum chamber 20 has a vertically extending partial partition 29 which divides the lower part of the chamber into two parts and extends above the level of the bed but has a passage 30 through which solids can flow from one subchamber to the other. The chamber 20 is divided by a diaphragm 21 into a large section 22 and a smaller section 23 to which sections gases are supplied through valve controlled pipes 47, 48. Material is supplied to the chamber through a conduit 15 and small solids are discharged via an overflow weir 25 and conduit 26, coarse solids which collect at the bottom of the chamber and then pass into the smaller sub-chamber are elevated by the separate gasflow and discharged via weir 27 and conduit 28 and dust leaves the chamber with the exhaust gases and is removed in a separator 36 Coarse solids may also be removed via conduit 37. In a modification the separated dust and smaller solids are returned to a blunger where they are mixed with the incoming wet material. A further modification (Fig. 3) has a tank 210, a plenum chamber divided into two sections 222, 223, a main partition 329 and a second partition 229. The material is fed in through a shoot 215 and dust &c. is returned from a separator 236 via pipe 238. Slurry is fed in through sprayhead 271 or sprayheads 273, 274 below the surface of the bed. The separation takes place in two stages. the section 333 functioning as an intermediate section.
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