BURDEN DESCENDING BEHAVIOR WITH RENEWAL OF DEADMAN IN A 2-DIMENSIONALCOLD MODEL OF BLAST-FURNACE

The present investigation was intended to elucidate the solid particle s behaviour in ironmaking blast furnace when the renewal of deadman co ke is going on. The measurement of solid particles velocity was perfor med with a two-dimensional cold model simulating both consumption of c oke in the raceway and renewal of the deadman. The existance of a dyna mic boundary for the deadman was clarified by the detailed analysis of the velocity characteristics, and size of the deadman was reduced as the renewal rate increased. The deadman was renewed by the particles f ed within a central, limited area at the top on the bed. Both the crit ical area and the descending velocity near the central axis of the sha ft became large with increasing of the renewal rate. An experimental c orrelation was obtained to estimate the span of the critical area. Fur ther, it was confirmed for the downflow of particles to rise from the bottom of raceway during renewal.