Abstract
This paper presents a predicting method for standard deviations of chemical composition fluctuations of raw meal at a kiln inlet using chemical analysis results of boring samples for raw materials in a quarry. A stochastic process representation for their fluctuations at the inlet of the plant is presented to specify their time domain fluctuations. The authors have also presented dedicated transfer functions which represent homogenizing effect of each constituent process and the raw material mixing control system. Using these representations, the Bode-diagrams to obtain decreasing performances of the fluctuations are finally presented. The theoretical calculation result of the standard deviation is compared with the result measured in an actual plant. As a result of a succession of these analyses, moreover, the authors could also present the structure of the mixing control system as a multivariable stochastic control system.
