| 摘要 |
PURPOSE:To improve thermal efficiency, by utilizing reducing gas generating by burning carboneous material in packing layer in a furnace to the reduction of ore and burning by produced gas, which does not reduct ore, by combustion- aiding gas blowing to the packing layer, to utilize as sensible heat. CONSTITUTION:The carboneous material 6 and the ore 7 are charged in the cylindrical furnace 1 to form the packing layer 9. Next, the combustion-aiding gas (for example, O2) is blown from the combustion-aiding gas blowing nozzle 3 arranged at the furnace bottom of the above cylindrical furnace 1, to burn the carboneous material 6. By this method, high temp. reducing gas is generated and also the ore 7 is prereduced. Next, the combustion-aiding gas is blown in the above packing layer 9, to burn the by produced gas, which is not contributed to the reduction of ore 7, and preheat the ore 7. Further, under remaining condition of the carboneous material 6 in the furnace 1, by blowing the combustion-aiding gas, molten iron and molten slag are extracted from tapping hole 4 for the molten iron and slag.
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