Abstract
A simplified model is developed to predict axial gas and product temperatures along tunnel kiln with neglecting cooling zone. The plate tunnel kiln is simplified as a counter current heat exchanger. The model is solved by Finite Difference Method. Mass and energy balance equations of gas and solid in elements are derived, which consider convective and radiative heat transfer from gas to solid. Equations of elements are solved continuously from kiln ending to beginning, in which two boundary conditions are adiabatic combustion temperature and product sintering temperature in the last element. The results of a standard case and a fitting case are discussed and compared with data from an existed kiln. The standard case proves Lorenz’s Nusselt function is more accurate than infinite flat plate Nusselt function for convection description in plate tunnel kiln. The fitting case proves this simplified model is available.
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