Kiln migration

Dear BPK

 

Generally Migration tell us about available gap in between kiln tyre and kiln shell.

measuring unit in mm, which calculate by the RPM legging between Tyre and kiln shell.

higher value and lower value both are dengerous for the kiln lining and kiln shell as well.

higher value (> 12 to 15mm)  indicate due to low kiln shell temp. kiln contrection  and gap between shell and tyre get increase, this is mainly because kiln coating condition. Similary Low value (< 4 to 5 mm) show due to high kiln shell temp. expansion in kiln shell which is minimise the gap between tyre and shell,due to this agin chances for kiln lining falling and parmanent deformation in kiln shell.

hope this help

regards

raju verma

In our plant also we different air gaps at three foundations of kiln .....what are the maximum allowable airgaps should have to maintained standardly...

Dear friends

In our plant Kiln tyre migrations are at higher side. Tyre-1 (Outlet end) has migration of 21to 22 mm, Tyre-2 (middle) has 24-26mm and Tyre-3 (inlet end) has 27-28mm. Please suggest what is the maximum permisible tyre migrations for any kiln. Our kiln size is Dia.4.8 x 74 mtr lg. designed for 5000 T PD operating at 5600 TPD. What could be the unwanted effects of too much higher migration. How can calculated new shims reduced minimum migraction 8 to 12 mm.

Please suugest.and give me details.........