Abstract
A common challenge to coal cleaning technologies is the development of suitable mechanical equipment together with the necessary instrumentation and control devices. This challenge was encountered in the design of a continuous unit for the LICADO (LIquid CArbon DiOxide) process for fine coal cleaning. A microcomputer-based control system was developed for the operation. The computer is equipped with A/D and D/A converter modules which accept input data from pressure transducers, Coriolis type mass flowmeters, a capacitance type liquid-liquid interface position probe, and liquid level switches while transmit control signals to pumps, pneumatic ball valves and regulating valves. Simple strategies were implemented to manage the feed and discharge from the process unit, to control operating variables, and to perform on-line data acquisition.
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