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“七五”国家重点工业试验项目—福州40米回转窑直接还原技术攻关工作,自1987年1月至1989年12月,经过近3年的努力,于11月16日～12月15日进行了连续30天的工业性试验。这一项目在技术上有较大的突破,对供煤系统进行了重大改进,并采用埋入式烧嘴。因此,操作稳定,温度控制准确,未产生结圈现象,窑内还原高温区可延长到窑长的60％。技术经济指标达到国际先进水平,利用系数达0.4,煤耗852.4kg/t(折合标煤690kg/t),成品金属化率92％以上,设备作业率达95％。
“Seventh Five-Year” national key industrial pilot project - Fuzhou 40 m rotary kiln direct reduction technology research work, from January 1987 to December 1989, after nearly three years of hard work, from November 16 to December 15 For 30 consecutive days of industrial testing. This project has a major technological breakthrough, the coal supply system has been greatly improved, and the use of buried burner. Therefore, the operation is stable, accurate temperature control, no knot ring phenomenon, the reduction of high temperature kiln can be extended to 60% of kiln length. Technical and economic indicators reached the international advanced level, the utilization factor of 0.4, coal consumption 852.4kg / t (equivalent to standard coal 690kg / t), the finished product metallization rate of 92%, equipment operating rate of 95%.