Development of high precision burden distribution control technology with wide flexibility at blast furnace

摘要

A new concept of burden distribution control and charging system have been developed for a stable operation under the high productivity, high pulverized coal rate and high small sized ratio operation condition. A safety factor analysis based on the soil mechanics was carried out. Reduction of charging weight at a unit area and inclination angle are effective to avoid the layer collapse. The fluidization index indicates that the optimization of particle diameter at the wall is necessary for the stability of burden at the lumpy zone and the dropping zone. According to these results, multi batch charging, flat burden surface profile and vertical falling trajectory were proposed for a new charging system. Stabilizer, multi-paralleled bunker and high speed rotation chute were applied to No.6 blast furnace at Chiba Works to realize the new charging system. To improve the controllability of the burden distribution, new methods to calculate surface profile and falling trajectory were incorporated to No.6 blast furnace burden distribution simulator.