摘要
本文基于产铁水量1t/h冲天炉改造所取得的经济效益，深感在设计中不仅要考虑有效高度，也要考虑预热带的有效容积．
Based on economic benefits resulting from the improvement of blast cupolas of one ton per hour ,the author concludes that when designing blast cupolsa ,not only the ef-fective height of blast but also the working volume of the preheating zone should be taken into consideration
