Abstract:

Proper set-point regulation based on quality assay is an important measure to optimize the operation of rotary kiln processes.However，due to the inherited non-stationarity of rotary kilns and the effects of various stochastic time-dependent variables，it is difficult to evaluate the performance of the set-point regulation.In this paper，a novel method is proposed to solve this problem.First，the time-frequency distribution characteristics of the quality fluctuation component resulting from set-point regulation were analyzed based on the large time-delay feature of the quality feedback within rotary kilns.Then the characteristics were used to separate the quality fluctuation component from the whole quality assay time-dependent serials with the Hilbert-Huang transformation.The intensity of the fluctuation component was estimated as a function of time.Finally，simulation results were provided to demonstrate the validity of the method.