Recent developments in clarifier design

This paper reports on the results of investigations to validate a model of fluid flow for the Sugar Research Institute (SRI) clarifier and ongoing development of modified clarifier designs to eliminate shortcomings with the standard SRI clarifier design that have been identified. Terminal settling velocities of tlocculated mud particles were determined as part of the validation process. Design studies have included an examination of the feed distribution system and short-circuiting characteristics of the standard SRI clarifier. A modified design of clarifier has been developed which has been operational since the end of the 1996 crushing season. The benefits include a 60% reduction in the residence time of juice and the potential to double the throughput rating without any loss in clarification performance. The results represent a significant gain to the Australian sugar industry, not only in clarification performance and in improved sugar quality, but also in reducing the cost for mill throughput expansions.