Abstract
An improved model is presented for the prediction of gas and ware temperature profiles during the firing of refractory blocks in tunnel kilns. The model represents the kiln as a series of plug-flow regions, in which heat transfer to ware occurs, interspaced by well-stirred adiabatic regions, in which burners and air inleakages are introduced. The model is constructed in two forms differing in treatment of unsteady conduction in the ware. The two-dimensional form gives good agreement with measured ware temperature profiles. The simpler one-dimensional form predicts gas temperature profiles accurately, and estimates representative ware temperatures. Both models solve the unsteady conduction equation with strongly nonlinear boundary conditions due to radiation.
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