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应用热风熔化,是强化冲天炉行之有效的方法之一。最近国外推广应用了400～500℃风温的热风,不仅使出鉄温度达到1500℃以上,并且大大增加了解决熔化过程中各种冶金問題、經济問題及金相組織問題的可能性,为球墨鑄鉄、高强度孕育鑄鉄及某些薄壁复杂鑄件的澆注提供了有利条件。上述冲天炉的热风系統大致可分为独立外热系統、利用冲天炉炉气燃燒的預热系統和利用冲天炉炉气直接加热空气换热器的預热系統等三种。按这三种类型的原則所設計的热风装置虽种类繁多,但往往結构繁复、占地面大、管道积灰严重,有其一定的局限性。1957年法国工程师烏尔謀(G.Ulmer)发表了他所設計的装在加料口上方的烟囱筒式换热器,在同样获得400℃热风的效果下,它具有不用合金鋼、不
Application of hot air melting, is to strengthen the cupola one of the effective methods. Recently, hot air with a temperature of 400-500 ℃ has been widely applied overseas, which not only makes the temperature reach 1500 ℃, but also greatly increases the possibility of solving various metallurgy problems, economic problems and microstructure problems in the melting process. Casting 鉄, high-intensity nurture castings and casting of some thin-walled complex castings provide favorable conditions. The above-mentioned cupola hot air system can be divided into an independent external heating system, the use of cupola furnace gas combustion preheating system and the use of cupola furnace gas directly heated air heat exchanger preheating system three. According to the three types of principles designed by the hot air device, although a wide range, but often complicated structure, accounting for the ground, pipeline fouling serious, has its own limitations. In 1957, G.Ulmer, a French engineer, published a chimney tube heat exchanger designed to be placed above the charging opening. With the same effect of hot air at 400 ° C, it had the advantage of not using alloy steel and not