Effects of Process Variability on Ring Formation in Lime Kilns, 2006 Engineering, Pulping, and Environmental Conference

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While flame temperature fluctuations are believed to be the main factor that leads to ring formation in lime kilns, the effect has not been verified due to the infeasibility of obtaining accurate temperature measurements inside an operating kiln where rings form. In this study, operating data from three lime kilns over a ringing period of each kiln were examined using SIMCA-P, a multivariate analysis program, to identify operating parameters that can cause temperature fluctuations and to examine possible correlations between the process variability and ringing. The results suggest that temperature-related parameters are not the only potential contributors to ringing. The variability in certain temperature-related parameters may also play a role.