Dear Sirs:

In this month, our plant used the new shipment of raw coal as the fuel and we found that gas from first stage of preheater was always higher than the last shipment. We tried to adjust the residue of piverized coal and the ratio between rotary kiln's two sides but these all couldn't be solution to the problem.

Are there any reason to prove the coal may effect the temperature of leaving gas? Or other factor will probably cause the gas high temperature?

Please give us some suggestion or sharing the experience.

Many thanks!