- 1 Thy Tyre –a Critical Section
- 1.1 Introduction
- 1.2 Effects of Increased Mechanical Load Due to High Ovality
- 1.3 Recommended Limits
- 1.4 Evaluation of Mechanical Condition
- 1.5 Summary Graph
Thy Tyre –a Critical Section
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Predominant wear mechanismsin rotary kilns
The tyre area, one of the most critical kiln zones, due to the combination of all three wear mechanisms, which increases the speed of wear dramatically
Pre-mature Wear at Tyre Section
Ovality and refractory lining
The lining life of the refractory lining is significantly influenced by the mechanical condition of the kiln shell.
Effects of Increased Mechanical Load Due to High Ovality
Consequences for the lining
Not only the refractory also the equipment can be effected
Signs of increased mechanical load
Recommended tyre creep and ovality
The ovalityof the kiln shell depends on the tyre clearance, the distance between kiln shell and tyre. The higher the clearance the higher also the ovality. The acceptable clearance depends on the diameter of the kiln.
Evaluation of Mechanical Condition
Measurement of creep and tyre clearance
For more detailed information of the mechanical condition of the tyre a so called Shelltest Measurement should be carried out regularly. It gives useful information for possible maintenance measures:
-measured ovalityin comparison to recommended range
-alignment of the support rollers
-load of the support rollers
-alignment of the kiln axis
-permanent kiln shell deformations
-cracks in the kiln shell
Definition of ovality
Ovality is the twofold difference between the smallest and biggest radius of the kiln shell during one revolution expressed in percent of the inner diameter.
Application of the measuring beam
For a representative result the measurement has to be carried out under normal operation conditions (coating conditions, kiln rotation, capacity etc.).
For the shelltest measurement the device from Philips kiln services of latest generation is used:
Philips Electronic Ovality Beam.
Interpretation and evaluation
Interpretation and evaluation :Ideal Curve
-The results of the Shelltest measurement can give useful advises for maintenance measures.
-Regular maintenance can prevent from increased or premature wear of the refractory lining dueto increased mechanical load.