| 摘要 |
<p>In order to preheat iron-base scrap comprising iron pieces of wide ranges of size and shapes at a high efficiency so that these pieces are not fused to one another, a rotary kiln type preheating furnace and a shaft furnace type preheating furnace are provided in parallel in a stage preceding the stage of a melting furnace in which the scrap is melted, and preheated scrap from the two preheating furnaces is placed in the melting furnace. A damper is provided between the shaft furnace type preheating furnace and melting furnace so as to introduce an exhaust gas from the melting furnace into the rotary kiln type preheating furnace while preventing the exhaust gas from directly entering the shaft furnace type preheating furnace, and the exhaust gas passing through the rotary kiln type preheating furnace is introduced into the shaft furnace type preheating furnace preferably from an upper portion thereof and discharged from a lower portion thereof. The rotary kiln type preheater and/or the shaft furnace type preheating furnace is provided with an air or oxygen inlet for burning inflammable components of the exhaust gas.</p> |
