Abstract
Many types of burden distributions can be produced by bell-less type charging equipment tor BF. However, the change in configuration of burden layer occurs in a furnace top. Therefore, the accumulated state of burden has been investigated by using an experimental apparatus built on a scale of one third of Muroran No. 1 blast furnace, and a mathematical model to estimate the burden distribution has been developed.
1) Materials charged at each turn of rotating chute form the burden layer with convex surface on the landing area.
2) Ore layer formed after each turn of rotating chute shows different configuration before and after occurrence of the coke layer collapse.
3) Change in particle size distribution depends on the charging conditions and gas flow. A regression equation expressing these relations has been obtained.
4) On the basis of the findings, a mathematical model in which the in-furnace parameters affecting burden distribution are taken into consideration has been developed. This model has a feature in regard to introduction of the idea that the imaginary unit volume is given by dividing one dump volume of materials into many pieces and burden distribution is constructed by accumulation of the unit volume.
By applying the mathematical model to Muroran No. 1 blast furnace, the suitable furnace operation has been obtained.
