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An alternative energy technology to save power consumption in the steelmaking process was developed with supplementary oxygen injection in a new shaft electric arc furnace (EAF). The optimisation of oxygen injection for enhancing post-combustion was carried out to increase the preheating temperature of the scrap in the shaft using preheating simulation and trial tests. The conditions of oxygen injection from supersonic burners and an oxygen lance, and the appropriate injection distance between molten bath and oxygen lance, were established through fluid flow simulation and practical tests. In addition, the optimal conditions for supersonic burners and oxygen injection to enhance the post-combustion were deduced. From comparisons of the present and conventional results, it was found that the electric energy and operating time of the shaft EAF were decreased through practical improvements, resulting in energy savings and increase in productivity on the shaft EAF.

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