Improving Lime Recovery Kiln Operation using CFD Modeling

ABSTRACT
With the drive to increase production and reduce operating costs, alongside the tightening of emissions regulations, it
is crucial that a lime recovery kiln be run in an optimum state. Due to the adverse conditions that such kilns are
operated under, however, it is a challenge to use the traditional methods to diagnose the causes when kilns experience
serious operational issues. The traditional methods, which rely on various diagnostic equipment, do not function well
in hot and dusting environments and are difficult to install and operate in an enclosed rotating cylinder.
Over the past decade computational fluid dynamics (CFD) has become a viable analytical tool in combustion
applications such as boilers and furnaces. Recent advances in physics models and numerical algorithms, coupled with
increases in computing power, has made it possible to conduct high-fidelity CFD modelling of routine rotary kiln
operation and use it for diagnostic purpose. In this paper a number of real cases will be used to demonstrate how CFD
modeling can be used effectively to diagnose operational issues in lime recovery kilns and help to provide practical
solutions and improve kiln operations.

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