I have a small question that in raw meal LSF is 90-92 while LSF in Clinker is comming around 92-94. im using HFO as fuel. How LSF in clinker is comming heighr than raw meal.
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Dear Sheikh, You have to take into consideration of the quality of the dust recirculated. If the quality in terms of LSF is higher than that of your normal kiln feed, then there is every likelihood that the LSF of your clinker will be slightly higher compared to your Kiln feed.
It is a simple mass balance. Inputs = outputs
Input: kiln feed
Outputs clinker and prehgeater dust
If preheater dust has LSF lower than kiln feed, than clinker must have LSF higher than kiln feed.
Other typical explanation is sampling error of the raw meal. It is very difficult to get a proper sample of raw meal without some segregation. Samplers are usually neglected in cement plants. Manual samples are terrible and screw samplers are not very good either. But these are unfortunately the most frequent methods you see in the industry.