Stockhouse-Based De-Icing, Drying and Pre-Heating of Coke and Pellets

摘要

Stable operation of a blast furnace requires careful consideration of dozens of inputs and factors. Heat and mass balance at the top of the furnace are those among the key factors to be taken into account. High temperatures at the top mean extra heat loss, process inefficiency, high dust emission, unnecessary load to the charging equipment, uptakes, downcomer and gas cleaning plant. Temperatures below a certain threshold mean moisture that enters the furnace with the raw materials will not get evaporated and the "process" water that ascends from the lower furnace will be condensed. As such the top part of the burden will start accumulating the water resulting in reduced "process height" of the blast furnace available for the physical and chemical reactions. Therefore, furnace operators balance the process conditions at the furnace top to the acceptable operating regime.