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一、前言 实践表明,用工频无芯感应炉熔炼铸铁具有一系列的优点,在国内外的铸造生产中得到了日益广泛的采用。但是,工频无芯感应炉消耗大量电能。一般,熔化铸铁时的额定电耗为550～600千瓦·时/吨。而由于种种原因,生产条件下的实际电耗还要高。 我国约有500多台工频无芯炉,大多数是1.5吨或更小容量的炉子。这些炉子虽然在改善铸件质量,提高铸件合格率等方面起了显著的作用,但比较普遍的存在电耗过高这个问题。 某汽车厂用10吨炉熔化铸铁,电耗650千瓦·时/吨;某机车车辆厂用3吨炉熔化柴油机曲轴用球铁,在连续生产条件下电耗650～700千瓦·时/吨;某内燃机厂用1.5吨炉熔化曲轴用球铁,电耗650千瓦·时/吨;某机械厂用1.5吨炉连续熔化各种牌号的铸铁,电耗650～
First, the preface Practice shows that the frequency of coreless induction furnace smelting cast iron has a series of advantages in casting at home and abroad have been increasingly widely used. However, power frequency coreless induction furnace consumes a lot of power. In general, the rated power consumption when melting cast iron is 550 to 600 kWh / h. Due to various reasons, the actual power consumption under production conditions is still high. There are about 500 MW-based furnaces in our country, most of which are 1.5-ton or smaller furnaces. Although these furnaces improve casting quality and improve casting qualification rate plays a significant role, but the more common there is the problem of excessive power consumption. A car factory with 10 tons of furnace melting cast iron, power consumption of 650 kWh / h; a locomotive and rolling stock factory with 3 tons of melting furnace diesel engine crankshaft with ductile iron, continuous production conditions, power consumption 650 ~ 700 kWh / ton; A combustion engine with 1.5 tons of furnace melting crankshaft with ductile iron, power consumption of 650 kWh / h; a mechanical plant with 1.5 tons of furnace continuous melting of various grades of cast iron, power consumption 650 ~