Effects of Rings on Flow and Temperature in Lime Kilns, 20PEERS Conference

Ring formation is often considered the most troublesome aspect of lime kiln operation. To better understand the causes that lead to further ring growth, a steady state, 2D axisymmetric lime kiln and ring model has been developed and validated. In this work, a typical kiln is modelled with rings of varying length, thickness, and geometry of the front and back faces, to study the effects on flow and temperature, and consider how these effects might impact ring growth and kiln operation. The results show that rings cause higher velocity gas flows, as expected, and insulate the adjacent refractory and shell, resulting in lower shell temperatures. The results also reveal the formation of recirculation zones just downstream of the rings, as well as temperature deviations upstream and downstream of the rings, that might promote recarbonation and further ring growth. 

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