• Kiln shell Ovality is an important parameter to assess kiln health and the monitoring become mandatory upon recurring refractory problem.
• Ovality, is defined as difference of shell diameter in horizontal and vertical axis. The difference arises because of flexing in kiln shell during operation, thermal, material loading, etc. attributed for the difference.
• The shell flexing is governed by following factors:
a. Beam strength of tyre
b. Kiln shell thickness
c. Kiln shell and tyre temperatures
d. Kiln shell misalignment
e. Air gap between tyre ID chair pad OD
f. Thermal and material loading
g. High run-out of kiln shell close to support stations, etc.
It comes under into Rotary Kilns.