Abstract
The energy cost of producing steel in an electric arc furnace (EAF) has a sizable influence on the prices of natural gas and electricity. Therefore, it is important to use these energies efficiently via a tailored oxy-fuel combustion burner and oxygen lance. In this study, an important modification of the side-wall injector system in the EAF at Hyundai Steel Incheon works was implemented to reduce electrical energy consumption and improve productivity. A protruding water-cooled copper jacket, including a newly designed burner, was developed to reduce the distance between the jet nozzle and the molten steel. In addition, the jet angles for the burner and lance were separately set for each scrap melting and refining mode. The modifications led to a reduction in electrical energy consumption of 5 kWh/t and an increase in productivity of approximately 3.1 t/h. Consequently, total energy cost savings of 0.3 USD/t and a corresponding annual cost savings of approximately 224,000 USD/year were achieved.
Highlights
In the recycled steel processing industry, the electric arc furnace (EAF) is an energy-intensive facility
This study primarily focuses on these specific aspects, which include modifications to include modifications to the side-wall injector system, with different burner and lance jet angles, but the side-wall injector system, with different burner and lance jet angles, and closely modifies the closely modifies the distance from the jet nozzle to the molten steel
System was was designed to operate the burner and lance separately, the existing threefor lines the supplied designed to operate the burner and lance separately, usingusing the existing three lines thefor supplied gases
Summary
In the recycled steel processing industry, the electric arc furnace (EAF) is an energy-intensive facility. With a moderate addition of chemical energy, provides sufficient heat to melt recyclable scraps charged in the EAF [1]. For the production of 1 t of steel at 1600 ◦ C from steel scrap at 25 ◦ C, a typical EAF process, approximately 60% of the energy input comprises electric energy and chemical energy provides the remaining 40% [2]. To improve the efficiency of heat used in the EAF, it is important to utilize a heat source other than electric power. To save energy in EAFs, it is important to optimize the utilization of chemical energy; energy can potentially be saved by reducing electrical energy use while increasing the chemical energy input [6,7]. Chemical energy, supplied by a side-wall injector system, is an auxiliary form of energy and is delivered by the oxidation of fossil
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