Abstract
The concurrent demands for lower-sulfur coal and lowerpriced coal have resulted in an increased interest in control of unit operations within the coal-preparation plant. While equipment control is widely used, process control of liquid/solid mixtures is seldom used and is fraught with problems. The control of medium specific gravity in a heavy-media cyclone-separation process exemplifies many of the issues that must be addressed. These include sensor and sensing problems, control-scheme selection, and process modeling constraints. This paper examines these issues and describes a pilot circuit that was constructed to facilitate a better understanding of the problems.
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