Scrap Melting Using a Shaft Furnace with Coke Packed Bed Injected with Highly Oxygen Enriched Air and a Large Quantity of Pulverized Coal.

概要

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There are electric furnace (EAF) method and basic oxygen converter (BOF) method as a large quantity of scrap melting method. These methods have problems respectively as follows: high electricity cost in Japan for EAF method, and low heat efficiency and refractory life for BOF method. To investigate the method to meet these problems, scrap melting test was performed using a melting test furnace with coke packed bed injected with highly oxygen enriched air and a large quantity of pulverized coal and the following results were obtained.(1) The pig iron whose quality is equal to that of the blast furnace can be produced with high carburization and high desulfurization using scrap (100% of material) and coke for blast furnace.(2) The fuel rate of 240 to 290 kg/t and productivity of 14.7 t/d/m3 were obtained.(3) The fuel rate can be decreased and productivity can be increased by post combustion with air injection from the shaft wall.Based on the above mentioned results, the comparison of energy consumption of this method, EAF and BOF was made and a possibility was confirmed that the energy consumption of this method was the least among three.
The Iron and Steel Institute of Japanの論文