| 摘要 |
<p>1481856 Sponge iron production USS ENGS & CONSULTANTS Inc 19 July 1974 [20 July 1973] 32177/74 Heading C7D In the production of sponge Fe from pelletized or lump ore, reducing gases are formed by gasifying coal, e.g. lignite, such that at least 80% is CO + H 2 , wherein at least a part of the gas leaving the ore reduction furnace is stripped of CO 2 , desulphurized and recycled. The fuel is gasified at 1, fed to dust separator 7, desulphurized at 8 with calcined dolomite or limestone, and fed to the reduction zone 10 of furnace 11. The gas leaving the furnace 11 is scrubbed and CO 2 is removed at 19 with K 2 CO 3 solution, the gas being fed to the newlyproduced gas at the mixing point 5, and, optionally, to the gasifier 1. Some gas may additionally go to the cooling zone 13 of the furnace 11 and hence to the reduction zone 10. The temperature of the gas leaving the gasifier is 2000-4000‹F and on entering the reduction zone is 1200-2000‹F.</p> |
