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本文叙述了把2.5吨/时多排小风口冲天炉改建为顺置式大双冲天炉的熔炼实践和认识。近二年的生产实践表明;铁水温度基本稳定在1410℃～1475℃,比多排小风口出铁温度提高50℃左右,铁水其它质量指标与铸铁质量,也随此得到显著提高,可获得相对硬度小于1的高质量铸铁。本文还分析了风口截面比为41/59时,上排风呈卡腰式炉型的熔炼特点及其影响。
This article describes the practice and understanding of the smelting practice of converting a 2.5 t / h multi-row small-outlet cupola into a large, twin cupola. The past two years of production practice shows that: the basic temperature of molten iron stabilized at 1410 ℃ ~ 1475 ℃, than the multi-row small tuyere iron temperature increased by about 50 ℃, other quality indicators of molten iron and quality of cast iron, also will be significantly increased, the relative Hardness of less than 1 high-quality cast iron. The article also analyzes the characteristics of the smelting of card-waist type furnace and its influence when the outlet cross-sectional ratio is 41/59.