SELF-LEARNING FUZZY CONTROLLING METHOD FOR COAL GASIFICATION UNIT

摘要

PROBLEM TO BE SOLVED: To provide a self-learning fuzzy controlling method for a coal gasification unit capable of suppressing the change of gasification furnace outlet gas temperature against a load change and maintaining a stable slag discharge.;SOLUTION: This controlling method is provided by calculating a deviation z between the furnace outlet gas temperature measured by a temperature- measuring device 30 and a set temperature 31 with a subtracting tool 25a for correcting oxygen/coal ratio for deciding an oxygen supplying amount demand against a coal supplying amount demand 20, obtaining a changing rate Δz of the deviation z with a differentiating tool 33, obtaining a correcting amount of oxygen/coal ratio by using z and Δz with a self-learning fuzzy controlling tool 24 according to a fuzzy rule, deciding the oxygen amount demand for feeding to the gasification furnace from the oxygen/coal ratio corrected by feeding back the above correcting amount and the coal supplying amount demand 20 with the subtracting tool 25b, adjusting an oxygen flow rate with a control valve 26 and thus suppressing the gas temperature change for maintaining it constant.;COPYRIGHT: (C)2002,JPO