我厂在一期改造中采用３ｔ／ｈ外水冷。冷风冲天炉，设计年产灰口铸铁２２２０ｔ，球墨铸铁６２０ｔ，保温炉采用５ｔ工频炉。通过生产验证，３ｔ／ｈ冲天炉存在着生产率低、设备可靠性差、生产能力比较低、铁水质量不稳定、环境污染严重、难以完成汽车行业大批量、连续生产的需要。针对３ｔ／ｈ冲天炉存在问题，我厂在１９９３年底对熔化工部进行了改造．引进了日本太阳铸机．４ｔ／ｈ热风水冷冲天炉及脱硫装置的技术和部分设备．本文介绍应用情况。 I plant in the transformation of a 3t / h outside the water. Cold cupola, designed with an annual output of gray cast iron 2220t, ductile iron 620t, holding furnace 5t frequency furnace. Through production verification, 3t / h cupola has low productivity, poor equipment reliability, low production capacity, hot metal quality is unstable, serious environmental pollution, it is difficult to complete the automotive industry in large quantities, continuous production needs. For the 3t / h cupola problems, our factory in the end of 1993 on the melting department was transformed. The introduction of the Japanese sun casting machine. 4t / h hot blast water cupola and desulfurization equipment technology and some equipment. This article describes the application.