Analysis of calcination parameters and the temperature profile in an annular shaft kiln. Part 2: Results of tests

The article discusses experimental measurements of the vertical temperature profile and kiln gas composition in an annular shaft kiln for lime burning. The results obtained confirm that calcination of the limestone in the kiln begins at temperatures between 820 °C and 830 °C. The average heat transfer coefficient from kiln gases to the stones is determined, as well as the calcination distribution within the kiln. Modeling the calcination process in an annular shaft kiln was performed on the basis of the measured temperature profile. The results of this model are in good agreement with those for samples of partially calcinated stones taken from the area of the lower and upper burners.