Abstract
A new method for performance evaluation of gravity-based coal-cleaning unit operations has been proposed in this article. This is done by evaluating the nature and the amount of misplaced particles in the clean coal fraction. The proposed performance parameters “Misplacement 1” and “Misplacement 2” vary from 0 to 1 and therefore, it is easier to compare the performance of various equipment on a simple common scale to process a typical coal. It takes into consideration the ash distribution of the misplaced particles to facilitate direct comparison of various gravity-based equipment as well as identifying their optimum operating conditions. The concept and the methodology to evaluate the proposed performance criterion have been discussed in detail. The advantages of using this new methodology over the conventional distribution curve analysis have been established with some illustrative examples.
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