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50吨和100吨电弧炉的废钢预热不仅可以降低电耗40～50KWh/t;电极消耗减少0.2～0.6kg/t;缩短时间8分钟,而且与油和其他可燃物质 (废物)污染环境问题,由于采用气体返回系统而得到解决。 日本电炉年产量大约2700万吨,约占粗钢年产量的25％。电炉炼钢能源价格是主要条件,特别是,从1980年初以来,包括电力在内能源价格比1970年下半年猛涨了1.4～1.5倍以上。因此,节能不仅对于电弧炉炼钢,而且对钢铁工业降低生产成本中的费用和保护能源资源已变得日益重要,节能技术的发展被看作是紧迫的任务。 在1979年Toshin steel和Nippon Kohen联合投资规划开发电弧炉节能技术,终于成功地利用电弧炉排出烟气的显热预热废钢,并达到商品化程度。由于Himeji工厂和Toshin钢厂在50吨和100吨电弧炉上使用成功的原因,在TOKYO工厂也安装了预热设备。 由于节能和提高生产率显著,日本还有其它电炉炼钢厂采用了废钢预热技术。
Preheating of scrap for 50-ton and 100-ton EAFs not only reduces power consumption by 40-50kWh / t; reduction of electrode consumption by 0.2-0.6kg / t; shortened time by 8 minutes but also pollution with oil and other combustible materials (waste) , Thanks to the gas return system. Japan’s electric furnace annual output of about 27 million tons, accounting for about 25% of crude steel production. Electric furnace steelmaking is the main source of energy prices, especially since early 1980, including electricity, including energy prices soared more than 1.4 times 1.5 times more than in the second half of 1970. Therefore, energy saving has become increasingly important not only for electric arc furnace steelmaking but also for the steel industry to reduce costs in production costs and to conserve energy resources. The development of energy-saving technologies is seen as an urgent task. In 1979, Toshin Steel and Nippon Kohen co-invested in the development of electric arc furnace energy-saving technologies and finally succeeded in using the electric arc furnace to preheat the sensible heat of the flue gas and achieve the commercialization. Due to the successful use of the Himeji and Toshin steel mills on the 50-ton and 100-ton EAFs, preheating equipment was also installed at the TOKYO plant. There are other electric steelmaking plants in Japan that use scrap preheating technology due to significant energy savings and productivity gains.