Production Practice of Increasing the Coal Ratio of Laiwu Steel's 1880m~3 BF

Through improving the spray gun system,putting end to the pipeline blockage problem and the most blowing quantity reached 50 t/h. By strengthening the management for raw material and fuel,implementing multi-ring burden distribution technology,optimizing the lower blast system and so on,the stability of Laiwu Steel's 1 880 m3 BF furnace conditions was enhanced and the ability to accept high coal ratio was improved. At same time,using high blast temperature and decreasing downtime,the coal ratio reached 170 kg/t above,the charge coke rate reduced to 330 kg/t below and the productivity was 2.6 t/(m·3d) above.