| 摘要 |
<p>PROBLEM TO BE SOLVED: To quickly melt iron and steel scrap as raw material in a good heat efficiency without needing high temp. blasting and to economically produce a cast iron by blowing oxygen-enriched air from tuyeres of a cupola. SOLUTION: A vertical melting furnace 1 of the cupola, etc., for producing the cast iron by melting the iron and steel scrap as the raw material with the combustion heat of coke is provided with a refractory-made hearth 4, a melting zone 3 composed of coke layer in the furnace hearth and a preheating chamber connected with a charging hole 14 for the iron and steel scrap as the raw material, and plural tuyeres 6 are fitted to the lower part of the melting zone 3. A bed coke is filled into the melting zone 3 and the oxygen-enriched air containing 25-40% oxygen is blown from the tuyeres 6 and the coke is quickly burnt to generate the high temp. at >2,000 deg.C, and the iron and steel scrap is quickly melted. After storing in a molten iron storing part 2, the molten iron is tapped from a molten iron tapping hole 16 and separated from molten slag with a dam block 18 in a molten iron runner. CO2 in exhaust gas generated by burning the coke is reacted with the coke at the upper part and the generated combustible CO gas is recovered and utilized and also, effectively utilized to the preheat of the cold iron and steel scrap and then exhausted from an exhaust tube 13.</p> |
