ESTIMATING THE THICKNESS OF COATING IN THE BURNING ZONE OF CEMENT KILNS INCLUDING THE AGING FACTOR

Abstract

The coat in the burning zone play an important role in cement industry and energy keeping, not only it protect the refractory bricks but also affect the type of clinkersproduced so it is a good idea to make some researches about this coatIn this papers the model produced by Sepehr Sadiqhi et.al. 2011 depending on themeasured process variables and scanned shell temperature, will reviewed to estimate thethickness of coating at Kufa cement kilns. The Aging factor will be entered to representthe phenomena when fused clinkers transform to solid and calculate the time required formaking this coating.The estimation of thickness in this model was depending mainly on the differencebetween the inside temperature gotten from the model and outside temperature measuredby kiln shell scanner at burning zone. The model was applied on two kilns (2 and 3) atKufa plants. The difference between theoretical and practical results for measuringthickness at kilns 2and 3 was 4.43 and 3.92 cm respectively , the time required forformation the stable coating was 24 hr or 960 rpm.