Electric ARC melting furnace

摘要

This invention is provided with a furnace body (1) having an electrode (3) and adapted to melt scrap with arc heat, an air blow port (20) from which air is blown into the furnace body (1) via an air control valve (19), a carbon blow rate indicator (CI) adapted to measure the quantity of carbon introduced into the furnace body (1), a scrap feed rate indicator (SI) adapted to measure the quantity of scrap introduced into the furnace body (1), an oxygen blow rate indicator (OI) adapted to measure the quantity of oxygen introduced into the furnace body (1), and a computing element (7) adapted to determine the quantity of air, which is required to completely burn carbon monoxide (23) in the furnace body (1), on the basis of the measurement values from the carbon blow rate indicator (CI), scrap feed rate indicator (SI) and oxygen blow rate indicator (OI) and control the degree of opening of the air control valve (19). The air the quantity of which is proportional to that of carbon monoxide (23) is blown from the air blow port (20) into the furnace to enable the combustion temperature in the furnace body (1) and the temperature in a scrap preheater to be controlled.