Investigation of bell-less charging based on full scale model experiments.

Abstract

The burden distribution in bell-less charging was investigated by the use of a full scale experimental apparatus and simulation models were developed on the basis of experimental results.The discharge behavior of burden from the bunker was found to be primarily funnel flow and was quantitatively evaluated by the simulation model considering the distribution of particle velocity in the flow region above discharge hole. Sinter showed stronger tendency to funnel flow than coke.The burden trajectory in the chute and outside the chute was successively estimated by solving the equation of motion on a single particle.The mixed layer formation was observed in bell-less charging as well as bell-armor charging. The extent of the mixed layer formation in bell-less charging was found to be expressed by the same experimental formula for bell-armor charging through the proper evaluation of “formation energy of mixed layer”.A simulation model of burden distribution was developed on the basis o f experimental results. The validity of the simulation model was confirmed by the comparison with experimental results in various charging schedules. The simulation model was successfully applied to the flat profile charging.