OPERATION OF METAL SMELTING FURNACE PROVIDED WITH WATER-COOLING FURNACE WALL AND METAL SMELTING FURNACE PROVIDED WITH THE FURNACE WALL

摘要

PURPOSE: To restrain the heat loss from a water-cooling furnace wall without obstructing the recovery of sensible heat in exhaust gas by introducing a specific quantity of cooling gas into a furnace, diluting and cooling the exhaust gas and forming a slag foaming layer on the surface of the water cooling upper furnace wall. CONSTITUTION: A water-cooling structure 4 is provided at the upper part of a metal smelting furnace 1 such as a melting furnace and refining furnace, and a hood 4 for recovering the sensible heat in the exhaust gas is provided at the furnace top. At operating the smelting furnace 1, gas blowing tubes 9a, 9b are provided near the lower end of the water-cooling furnace wall 5 formed above the molten metal surface to introduce a dilution cooling gas in a horizontal direction into the furnace at the flow rate of 20-50% of the exhaust gas flow rate. By this method, the temp. in the furnace is lowered by about 100-200 deg.C by diluting and cooling the exhaust gas, and also, the slag layer 7 is frothed and the proper slag foaming layer 12 is formed near the surface of the water cooling furnace wall 5 to reduce the heat loss from the water cooling furnace wall.