Size segregation of sinter in top bunker of a bell-less type blast furnace.

Abstract

The size segregation of sinter in a top bunker of a bell-less type blast furnace was experimentally investigated by the use of a full scale model as well as a 1/10 scale model and the following results were obtained.The size variation during discharging from the bunker was significantly reduced by the installation of a simple stone box of suitable size at the suitable vertical position in the bunker for the restraint of the size segregation during charging of burden into the bunker. On the other hand, the installation of an insert to regulate solid flow in the bunker during discharging resulted in the meager reduction of the size variation during discharging. Accordingly, it is proved that the restraint of the size segregation in the bunker is of prime importance for the reduction of the size variation during discharging.The increase of the charging rate of burden into the bunker decreased the size segregation in the bunker and, as a result, the size variation during discharging was reduced.In case of bunkers in series, the size variation during discharging from the lower bunker significantly depends on the re-segregation of burden in the lower bunker during discharging from the upper bunker.