Coolant coils located in wall of metallurgical melting furnace - and fed with high velocity mist of gas and water

摘要

Zones forming part of the walls of metallurgical furnaces and subjected to severe working conditions are cooled via coolant coils built into the wall; and a gas mixed with fine drops of water is fed at high velocity through the coils. The gas is pref. inert w.r.t. the coolant coils, and contains 10-50 wt. % of pure, de-ionised water. Both the gas and the water are pref. recirculated, and the gas pref. travels at 10-100 m/s. The total pressure in the coils is pref. lower than the pressure in the furnace chamber. The pref. plant includes a pump feeding the gas through injectors fed with water; and the mist leaving the furnace is fed through a cooler and a water separator from which the water is recirculated to the injectors. Used e.g. in a furnace wall exposed to molten slag which would normally cause rapid wear of the refractory furnace wall.