| 摘要 |
1,139,117. Preheaters for granular &c material. METALLGESELLSCHAFT A.G. 12 April, 1967 [13 April, 1966], No. 16746/67. Heading F4B. A preheating shaft for ore pellets being fed to a rotary reduction furnace 5 comprises rotary pocketed drums 2 arranged as a zig-zag stepped grate on driving shafts extending through the shaft wall, a feed shoot 4 into the furnace, and a cyclone separator 6 with a feed pipe 7 back to the shaft controlled by valves 8. Material which is not preheated, e.g. coal, may be fed into shoot 4 by pipe 10 and gas-lock 9. The driving shafts may be hollow and water cooled, and adjacent flights of the rotary drums rotate in opposite directions. These flights are disposed at 40-60 degrees to the horizontal and the vertical spacing of the drums is 10-30 cms. Any combustible gas evolved from the furnace may be burned in the lower part of the preheating shaft. |
