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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

A Computer Model for Simulation of Drying and Preheating of Wet Iron ore in a Rotary Kiln

Get access (open in a dialog) DOI: 10.1615/IHTC15.hex.009411
pages 3497-3511

要約

This paper presents an improved computer model of drying and preheating of wet iron ore in a rotary kiln. The heat transfer model includes turbulent convection of the , radiation heat exchange among , refractory wall and the solid surface, conduction in the refractory wall, and mass and energy balances in the and solids. The gas convection has been modelled using ANSYS-FLUENT 14.5 assuming no rotation of the kiln. Based on the aforesaid CFD data the local convection heat transfer coefficients have been calculated. Finite difference techniques are used, and the steady state thermal conditions are assumed. The false transient approach is used to solve the wall conduction equation. The solution is initiated at the inlet of the kiln, and proceeds to the exit. The output data consist of the refractory wall temperature distribution, axial solids and gas temperature profiles, and the total kiln length. The inlet of the kiln is the outlet of the gas. Thus, for a fixed solid and gas temperature at the kiln inlet, the program prescribes the inlet temperature of the gas in order to achieve the specified exit temperature of the solid. The kiln length predicted by the present model is 48.6 m as compared to 45.7 m of the actual kiln. The axial gas and solid temperature profiles have been satisfactorily validated with the numerical results and measured data of Sass [1]. A detailed parametric study lent a good physical insight into the drying process and kiln wall temperature distribution.