Clean Automation Technology for Electric Arc Furnace Steelmaking

Abstract:

DANIELI's clean automation technology for Electric Arc Furnace (EAF) Steelmaking is meant for sustainable use of electrical and chemical energy and feed material in terms of scrap and DRI/HBI. This takes a 'five-pronged' approach. The advanced technology suite consists of EAF Scrap Optimizer, EAF Slag-building Optimizer, Off-gas Analyser, Electrode Regulator, and finally system integration and transport of DRI in EAF CONSTEEL making process. The Scrap Optimizer is meant for use of 'worst' grade scrap; this saves 'good' quality scrap and the DRI/HBI requirements for melt dilution. The Slag-building Optimizer provides optimum generation of slag for arc coverage, and minimum requirements of Dolomite to produce slag and to lower phosphorous content of steel. The Off-gas analyzer is developed to measure the chemical composition of fumes such as CO, CO2, and O2. With such on-line measurement it can optimize alternative use of chemical energy through fixed burner injection system. The reduced consumption of chemical fuel reduces the fume generation. DANIELI HiREG PLUSTM is developed to regulate the operation of electrodes in order to maximize energy utilization in the melt, and minimize electrical energy consumption in furnace operations. Finally, the integration of DRI Plant and transport of Hot DRI with scrap feeder to CONSTEEL EAF saves electrical energy consumtion in EAF. Danieli's clean technology was implemented successfully in Emirates Steel, Abu Dhabi (UAE), EZZ Steel and Suez Steel in Egypt. DANIELI's clean technology, therefore, helps optimize use of recyclable scraps, reduces consumption of high quality DRI and hence, the iron ore. At the same time, it reduces electrical and chemical energy consumption. The present paper describes DANIELI's clean automation technology solutions for electric arc furnace steelmaking in terms of improvement in electrical and chemical energy efficiency.

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