二、熔化工部近年来工频感应电炉虽然在国外发展很快,但在美国还是主要用冲天炉作为熔化设备。选用什么炉子作熔化设备,主要决定于焦炭质量和电力供应情况,如焦炭质量较好,又可及时供应,则采用冲天炉较好。冲天炉防止污染的投资费用较大,要占冲天炉投资的75～100％,其优点是灵活、便宜。熔化炉近来都 Second, the melting department In recent years, although the frequency induction furnace developed rapidly in foreign countries, but in the United States or use cupola as the melting equipment. The choice of what furnace for melting equipment, mainly depends on the coke quality and power supply, such as coke quality is good, but also timely supply, the use of cupola is better. Cupola to prevent pollution of the larger investment costs, to occupy the cupola 75 to 100% of investment, its advantage is flexible and cheap. Melting furnace recently all