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Technical Cement Forum / Residence time inside Kiln

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Biju 15/12/2006 08:37:22

Residence time inside Kiln

I know the formula for calculating residence time. But in that formula the % Calcination is not a parameter. Hence inspite of increased calcination by modification (say 5%) the kiln residence time is kept as original. Is there any formula by which the same can be calculated in terms of Calcination already achieved at Kiln Inlet?

What I mean to say is that a Preheater having 90% calcination feeding to Kiln is presently running with 20 minute residence time inside kiln. In case by modifying cyclones and achieving 95% calcination , how much the residence time can be reduced ?

Michael Clark 17/01/2007 11:10:46

I do not know of any such formula. The only way of adjusting the residence
time is via the rotational speed of the kiln. My recommendation would be to
run at maximum rotational speed with a precalciner kiln unless there are
particular combinability problems with the kiln feed.

Raju Verma 15/04/2014 08:45:16

dear Mr. Biju

can you share the formula for kiln residence time with % calcination

this is also new for us

thanks

raju

Belite 15/04/2014 12:34:50

I doubt it matters much for the residence time. Unless you increase production the gas volume through the kiln will decrease (less CO2 from calcination, less fuel on the main burner), and this will probably mean less dust being returned.

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