1概述预热送风是强化冲天炉熔炼的有效措施之一，热风能强化底焦燃烧，提高熔炼效果。当风温超过3500℃，对提高铁水温度、改善铁水质量、降低焦耗和提高熔化率等均有显著效果，冲天炉的热效率随热风温度的提高而提高，国外冷风冲天炉的热效率一般为32．4％，当风温为600℃时， 1 Overview Preheating air supply is one of the effective measures to strengthen the cupola melting. The hot air can strengthen the bottom coke combustion and improve the smelting effect. When the air temperature exceeds 3500 ℃, there is a significant effect on raising the hot metal temperature, improving the hot metal quality, reducing the coke consumption and increasing the melting rate. The thermal efficiency of the cupola increases with the increase of the hot air temperature. The thermal efficiency of the foreign cold cupola is generally 32 .4%, when the wind temperature is 600 ℃,