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通常采用冲天炉熔炼铸铁,并能适当提高出铁温度,熔炼过程的效率是很高的。但是要大量地使铁水过热,则效率逐渐变低。与此相反,采用电炉过热热效率很高,不过用电炉熔化固体炉料则效率就不那么很高。所以结合两者的特性,使用冲天炉熔铁,再用电炉使铁水过热。目前许多铸造厂采用这种双联操作法,这种技术还将进一步发展。出铁温度低时,焦炭冲天炉的操作是有困难的。尽管这是获得最低焦耗的最有效的方法,但易发生下列问题:难于增碳、炉渣流动性差、堵塞风口、总的维修工作麻烦等。在双联熔炼时,冲天炉的出铁温度通常大大超过1400℃。在双联操作中,电炉通常作为一种保温设备,并且过热范围一般不超过100℃。冲
The cupola furnace is usually used for melting cast iron and the tapping temperature can be appropriately increased. The efficiency of the smelting process is very high. However, to overheat the hot metal in large quantities, the efficiency becomes lower. In contrast, the use of electric furnace overheating thermal efficiency is very high, but the use of electric furnace melting solid charge is less efficient. Therefore, the combination of the characteristics of both, the use of Cupola melting iron, then hot metal furnace overheating. At present, many foundries use this double operation, this technology will be further developed. When the iron temperature is low, coke cupola operation is difficult. Although this is the most effective way to achieve the lowest possible coke loss, the following problems are likely to occur: difficulty of carbon addition, poor slag flow, blockage of the tuyere, total maintenance work, etc. In double melting, cupola furnace tapping temperature is usually much higher than 1400 ℃. In double operation, the electric furnace is usually used as a kind of thermal insulation equipment, and the overheat range is generally not more than 100 ℃. Rush