| 摘要 |
1,112,312. Heating or cooling granular material. R E. FUTER. 18 Jan., 1966 [27 Jan., 1965], No. 2242/66. Heading F4U. Sand, cement clinker, or ground cement is fed on to a sheet metal table conveyer 11, 12 having a plurality of longitudinally spaced transverse passages 15, 16 inclined at an angle of 10 to 30 degrees, the particles being heated or cooled and simultaneously transported by gas jets blown through the passages 15, 16 from lower plenum chambers 18 and 22. The granular material G is fed from a conveyer belt 30 on to the inclined feed zone 11 above plenum chamber 18, the gas jet flow through the passages 15 accelerating the particles along the table and flash cooling them. The gas jet flow through passages 16 in the narrower conditioning zone 12 above plenum chamber 22 completes the heating or cooling, and transports the particles to a take-off conveyer belt 31 equipped with a deflector 32. The gas supply to the chambers 18, 22 is from air blower 26 through ducts 25, chamber 18 communicating with chamber 22 through a flow-controlled passageway 27. The air pressure in chamber 22 is therefore less than that in chamber 18, and the kinetic energies of the jets passing through the passages 16 are therefore less than those passing through the passages 15. In conjunction with a greater number of passages 15 provided, this therefore causes the particle residence time on conditioning zone 12 to be greater than that on feed zone 11. In modifications, the gas supply to the two plenum chambers may be from separate sources, a hood (not shown) may be provided over the table, the granular material may be fed from a hopper or shoot, and the feed zone may be flat (Fig. 4, not shown). |
