Research Article
Nonisothermal Thermogravimetric Analysis of Thai Lignite with High CaO Content
Table 1
Analysis results of Thai lignite samples.
| Characterization | Low CaO lignite | High CaO lignite |
| Proximate analysis (% w/w, as-received basis) | | | Moisture content | 35.1 | 39.6 | Volatile matter | 28.2 | 27.6 | Fixed carbon | 25.8 | 20.9 | Ash | 10.9 | 11.8 | Ultimate analysis (% w/w, dry basis) | | | C | 58.5 | 58.4 | H | 3.0 | 2.4 | N | 1.9 | 1.8 | O | 12.9 | 12.6 | S | 5.5 | 3.3 | Heating value (MJ/kg, dry basis) | | | HHV | 23.7 | 22.6 | LHV | 23.1 | 22.0 | Ash compositions | | | Na2O | 1.9 | 0.7 | MgO | 4.2 | 3.4 | Al2O3 | 13.4 | 1.4 | SiO2 | 21.1 | 16.6 | P2O5 | 0.1 | 0.2 | SO3 | 17.4 | 33.4 | K2O | 1.3 | 0.2 | TiO2 | 0.3 | 0.1 | Fe2O3 | 28.9 | 15.9 | MnO2 | 0.1 | 0.1 | CaO | 11.4 | 28.2 | CaO (SO3-free basis) | 13.8 | 42.3 | Base-to-acid ratio | 1.37 | 2.68 |
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