Due to extremely aggressive environment and resistance to destruction in the clinker making process in the rotary kiln the brick lining should be good enough to withstand. The Potential Impacts are as mention below
Thermal
- Flame/impingement
- Over heating
- Thermal cycling
- Thermal shock
Mechanical
- Shell condition
- Shell ovality
- Kiln alignment
- Tyre clearance
- Shell thickness
- Kiln speed
Atmosphere
- Reducing/ oxidising
- Cycling
- Volatiles
- Dust
Kiln charge
- Infiltration of liquid
- Condensation of volatiles
- Abrasion
- Chemical variation
- Stability/presence coating
Lining stability
- Brick quality
- Brick tolerance
- Fitting to shell
- Ring tightness
- Alignment to shell
- Expansion allowance
- Retaining ring
Refractories are not able to withstand the extremes conditions – design is a compromise of properties
Refractory analysis
- First approach for analysis is to assess the reasons for premature failure.
- Wear issue are calculated from time to time as consumption of refractory in terms of kg per MT of clinker produced.
- Improvements are planned for process conditions and equipment to reduce the impact upon the refractories, Instead of trying to change the refractory specification
Most important property of refractory selection is “performance in service”
