ring formation in kiln cement pdf

ring formation - page 1 of 9

ring formation - page 1 of 9

If the ring is near the kiln discharge , it might be the ash ring which is not very stable in natureIn the buring zone, ring formation may occur if the % liquid phase went on the higher side than the normal operating range for a particular kilnI had a personal experience of ring formation in a 3m dia semi dry kiln in the preburning zone. The kiln need to be stopped for every week to break thering. This was overcome reducing the hot primary temprature from 150 deg C to 90 degC bydiluting with fresh air.Higher burning zone temperature would cause the liquid phase formation in the preburning zone itself which would be cooled and formed as ring.Near the kiln inlet, meal ring formation is normal but not stable

I had a personal experience of ring formation in a 3m dia semi dry kiln in the preburning zone. The kiln need to be stopped for every week to break thering. This was overcome reducing the hot primary temprature from 150 deg C to 90 degC bydiluting with fresh air.Higher burning zone temperature would cause the liquid phase formation in the preburning zone itself which would be cooled and formed as ring.

Possible reasons for ring formation,Raw mix design,High coal ashHigh liquid phaseQuality/ condition of refractoryHigh alkali feedBurner pipe conditionCooler conditionBut to study all above reasons we have to run our kiln for 20 ~ 30 days continuously, we have technique to remove big clinker balls without stopping the kiln. Vikpro

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