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On the design and assessment of control schemes for balling-drum circuits used in pelletising (Wellstead, P.E.)

Bibliographical information (record 265128)

On the design and assessment of control schemes for balling-drum circuits used in pelletising
Author:	Wellstead, P.E. Search Author in Amazon Books
Publisher:	Elsevier,

Edition:	1978.
Classification:	PE1072
URL:	http://library.neu.edu.tr:2048/login?url=http://dx.doi.org/doi:10.1016/0301-7516(78)90005-4

Detailed notes

- he surging behaviour of the balling-drum circuits used in pelletising is identified as a limit-cycle oscillation by a control-theory analysis. The principles resulting from this analysis are then used to devise and assess a range of possible schemes to control the surging behaviour. Two basic approaches to the problem are identified: 1. (1) conventional control (in balling-circuit terms), where the moisture content is used to modulate the surge level of the circuit; and 2. (2) circuit modification to design out the surge which corresponds to the classical control-system technique of feedback compensation. The various schemes are tested and their effectiveness assessed using a digital simulation of the balling-drum circuit, which is based upon the fundamental kinetics of balling. The circuit-redesign approach is shown to be a robust technique with both good practical properties and a sensible interpretation in terms of feedback control theory. Conventional control strategies, however, require a significant pay-off between surge level and product quality to be effective.