“高温、优质、低耗”,这是当前铸造业对铸造熔炼设备及工艺所提出的要求。多年来一直是国内铸造工作者探索的方向。 八十年代初根据能源资源条件和提高球墨铸铁铸造质量的要求出发,我们研制的短线圈工频感应前炉(也可简称工频前炉),已在省内外铸造、冶金行业获得推广应用。投产以来,在提高温度、铁水调质,提高球铁质量、合理使用能源方面,尤其是利用该设备进行铁水连续净化脱硫方面取得较大的突破,获得较大的经济效益。 一、短线圈工频感应前炉双联熔炼的特点 近年来,随着生产的发展,电炉熔炼已在铸铁熔炼中得到应用。它可以满足铁水温度和提高铸件质量的要求,但基本购量费用大且需消耗较大的电能,因此,它的发展受到一定限制。 当前,在机械行业中,焦炭冲天炉仍是熔炼铸铁的主要设备。但是随着生产的发展,尤其是生产球墨铸铁,对冲天炉铁水质量和合理使用能源,提出了更高的要求。比较一下冲天炉和感应炉溶化的特点,冲天炉熔化热效率高(60％),但是过热铁水的热效率很低(仅7％),尤其当使用较差的焦炭时,即使焦炭的耗量成倍增长,铁水温度也很难得到显著提高,而感应电炉熔化效率较冲天炉低,但其过热效率较高(60％)。双联熔炼工艺则是充分利用冲天炉熔化效率高与电炉过热效率高的 22 “High temperature, high quality, low consumption”, which is the current casting industry requirements for casting smelting equipment and technology. Over the years has been the direction of foundry workers to explore. In the early 1980s, based on the requirements of energy resources and improving the quality of ductile iron casting, we developed a short-coil power frequency induction furnace (also referred to as power frequency forehearth), which has been applied and promoted in casting and metallurgical industries in and outside the province. Since it was put into operation, great breakthroughs have been made in raising the temperature, improving the quality of ductile iron, improving the quality of ductile iron and using energy in a rational manner. In particular, great breakthroughs have been made in the utilization of this equipment for continuous purifying and desulphurizing molten iron, and great economic benefits have been obtained. First, the short coil frequency induction furnace double melting characteristics In recent years, with the development of production, electric furnace smelting has been applied in cast iron smelting. It can meet the hot metal temperature and improve the quality of the casting requirements, but the basic purchase cost is large and consumes large amounts of electricity, therefore, its development is subject to certain restrictions. Currently, in the machinery industry, coke cupola is still the main equipment for smelting cast iron. However, with the development of production, especially the production of ductile iron, the quality of the hot metal in the cupola and the rational use of energy, put forward higher requirements. Comparing the melting of cupola and induction furnaces, the cupola melts at a high thermal efficiency (60%), but the superheated hot metal has a very low thermal efficiency (only 7%), especially when poor coke is used, doubling the coke consumption Increase, hot metal temperature is also difficult to be significantly improved, while the induction furnace melting efficiency lower than the cupola, but its overheating efficiency is higher (60%). Double melting process is to take full advantage of high melting furnace cupola and electric furnace overheating and high efficiency of 22