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EAF Emissions

Steel mills, mainly in North America, are concerned about the stringent Electric Arc Furnace (EAF) emission permit limits imposed by various regulatory bodies. There are mainly two mechanisms of dust formation, namely enhanced vaporization effect and bubble burst effect. In the present study, nine cases were considered by a steel plant, for which the measured iron, manganese, zinc, and lead contents in dust were compared with predictions made using computational thermodynamics. The difference between the plant data and predictions is attributed to the fact that EAF does not operate under perfect equilibrium conditions and dust formation by mechanical action is not considered in the thermodynamic calculations. Similar trends of element distribution explain the different dust formation mechanisms for iron, manganese, zinc and lead. Computational Fluid Dynamics (CFD) was applied to estimate the efficiency of the capture system and also calculate the amount of dust deposited in the EAF doghouse.

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