1 Initial status
The first step of the study consisted in establishing a global heat and mass balance of the kiln. The energy balance is summarized in Table 1.
The energy balance actually highlighted the fact that more than 8 % of the total heat input (natural gas) was used to dry the limestone in the preheating zone of the kiln. At the time of the study the kiln feed moisture was 6.9 %.
Then, in order to better understand the kiln burning conditions, the temperature profile of the kiln was measured. The measurement was carried out with a 25 meter long thermocouple inserted at the top of the...