Experimental Investigation of Efficiency Surface Washing Technologies

Istók, Balázs [Istók, Balázs (Áramlástan), author] Department of Fluid Mechanics (BUTE / FME); Kristóf, Gergely [Kristóf, Gergely (Áramlástan), author] Department of Fluid Mechanics (BUTE / FME); Téglás, Zoltán

English Scientific Conference paper (Chapter in Book)
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    The primary function of cold rolling is the removal of the layer of cinder from the steel sheet by submerging it into aggressive hot sulfuric acid bath. In order to avoid corrosion it is necessary to clear all the remaining acid and saline from the surface of the product by washing. The washing technology presently in use is a sequence of three technological steps: cold water spraying, submerging into a hot water pool, hot water spraying. Effectiveness of each steps of washing technology has been investigated by laboratory experiments. The experimental investigation has been focused on removal efficiency of the ferrous sulfate fixed on the surface of the sheet. In the case of spray washing the effect of water pressure, distance, and angular settings of spray heads on saline removal has been investigated. In the case of pool washing the effect of residence time has been studied. On the basis of experimental results and theoretical assumptions on the temperature dependence of washing efficiency proposals for technological changes has been developed in order to decrease energy consumption.
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    2021-10-22 23:49