Dynamic CFD Modelling of Calcination in a Rotary Lime Kiln

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  • A dynamic 2D axisymmetric CFD model, coupled to a 1D bed model, has been developed to simulate the production of lime in a rotary kiln. The model simulates heat transfer caused by radiation, convection and conduction between the gas, wall, and bed to determine the axial bed temperature in the kiln. The calcination reaction is modelled using a shrinking core model, where the simulation predicts the start of calcination in the kiln, as well as the degree of calcination at the end of the kiln. The dynamic model will help develop a better understanding of the impact that fluctuations in the calcination start location have on mid-kiln ringing. The solid motion within the kiln is modelled using Kramer’s equation, modified for transient response. The 2D CFD gas model is implemented in ANSYS Fluent; the 2D gas and 1D bed models are coupled by mass and heat sinks to simulate heat transfer and the calcination reaction. Steady-state and dynamic simulation results are compared to data from an industrial dry lime kiln, and good agreement is found.

    Part of Proceedings of the Canadian Society for Mechanical Engineering International Congress 2022.

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    Attribution-NonCommercial 4.0 International