Abstract
Experimental as well as theoretical studies were made on the basis of the breakage contact model to elucidate the breakage mechanism of cokes in the drum tests and the following equation to express the size distribution of cokes after breakage was obtained.
R(Dp, t)={1−(Dp/Dps)3(E/M)/(wt)}exp[−{wt/(E/M)}(Dp/Dpmax)γ]
Here in the equation, R(Dp, t) is the size distribution function at time t in the cumulative oversize of Dp. The key w means the specific work rate cokes suffer from the breakage system. Dps is the size of sample and Dpmax is the maximum size to breakage fragments. The key (E/M) means the specific energy loaded per unit mass of breakage fragment and is named apparent fines generation energy. The key γ is the size distribution index to characterize the size distribution profile of the breakage fragments. These two parameters dominate the breakage phenomena and their values are given as functions of the mechanical properties of sample coke and the mechanical load conditions of the concerned breakage system.
The equation was confirmed useful to predict the breakage phenomena throughout the experiments with using three kinds of drum machine.
