Hello Phanminh,
Sorry to take so long to answer your question but I have been on annual leave for a month or so.
Unfortunately the literature I have concerning burnability testing is proprietry information and, as such, I can't release the exact test details publicly. However, I can tell you that the method involves burning nodulised raw meal + coal ash in a laboratory
furnace at clinkering temperature for a period equal to the residence time in the burning zone and then testing the resultant clinker for free lime. (you will need a furnace that is capable of 1500degC)
The higher the free lime of the clinker produced, the harder the raw meal is to burn. A scale similar to the following is normally used;-
Free CaO Burnability
0 - 1% Excellent
1 - 2% Very Good
2 -3% Good
3 - 4% Good - Moderate
4 - 5% Moderate
5 - 6% Moderate - Poor
6 - 7% Poor
7 - 8% Very Poor
>8 Extremely poor
NOTE: This method is comparative. Therefore you have to perform quite a lot of base-line tests on your normal kiln feed before making any improvements to the burnability of the kiln feed. But once you have this 'normal' base-line data, this test will tell
you if any changes to the process have significantly improved the kiln feed burnability or not.
More can be found regarding raw meal burnability in this paper by Linda M. Hills et al;-
http://www.asocem.org.pe/bivi/sa/dit/icem/G2-2002.pdf
To calculate the specific heat consumption you need to use the net calorific value (N.C.V) of the fuel(s). The N.C.V. allows for the energy lost due to the formation and vaporisation of water (both water contained in the fuel and water formed from the hydrogen
and oxygen in the molecular structure of the fuel itself.)
Hope this helps...
Regards,
Ted.
