Table 3. Elemental and Petrographic Characteristics of the Bulk Coals.
| parameters | Antioquia | Cundinamarca | Patia | Valle |
|---|---|---|---|---|
| carbon (%) | 56.5 | 66.1 | 47.6 | 52.2 |
| hydrogen (%) | 4.9 | 4.8 | 4.0 | 3.9 |
| nitrogen (%) | 1.4 | 1.6 | 1.3 | 1.1 |
| sulfur (%) | 0.9 | 1.1 | 1.3 | 2.5 |
| gross dry higher heating value (J/g) | 25,333 | 29,945 | 24,532 | 21,948 |
| dry ash-free higher heating value (J/g) | 28,139 | 34,138 | 31,098 | 32,630 |