Research Article
Characterization of Some Nigerian Coals for Power Generation
Table 10
Comparison of properties of Amansiodo coal with published bituminous coal quality requirements for pulverised coal-fired plants.
| | Parameter | Desired values | Typical limits | Amansiodo coal |
| | Heating value, MJ/kg ar | High | Min 24-25 (23) | 27.48# | | Moisture, % ar | 4–8 | Max 12 | 5.4# | | Volatile matter, % mf | 20–35 | Min 20 (side-fired furnaces) | 38.1# | | 15–20 | Max 20 (down-fired furnaces) | 38.1† | | Ash, % mf | Low | Max 15–20 (max 30) | 8.6# | | Sulphur, % daf | Low (<1%) | Dependent on local pollution regulations | 0.92# | | Nitrogen, % daf | Low | (0.8–1.1) dependent on local pollution regulations | 1.58† | | Chlorine | Low | Max 0.1–0.3 (max 0.5) | Not analysed | | HGI | High | Min 50–55 (min 39) | Not analysed |
| | Ash analysis, wt% ash | | Silicon dioxide | | (45–75) | 58.94# | | Aluminium oxide | | (15–35) | 29.13# | | Titanium oxide | | (0.4–2.2) | 2.13# | | Ferric oxide | | (1–12) | 6.90# | | Calcium oxide | | (0.1–2.3) | 0.34# | | Magnesium oxide | | (0.2–1.4) | 0.35# | | Sodium oxide | | (0.1–0.9) | 0.06† | | Potassium oxide | | (0.8–2.6) | 1.32# | | Sulphite | | (0.1–1.6) | Not analysed | | Phosphorus pentoxide | | (0.1–1.5) | 0.22# |
| | Ash fusion temperatures, °C | | Initial deformation | High | (>1075) | >1550# | | Softening | High | (>1150) | >1550# | | Hemispherical | High | (>1180) | >1550# | | Fluid | High | (>1225) | >1550# |
| | Maceral analysis, % | | Vitrinite | | 55–80 | Not analysed | | Exinite | | 5–15 | Not analysed | | Inertinite | | 10–25 | Not analysed |
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Typical limits refer to those commonly quoted; those in brackets indicate outer limits acceptable in some cases.
#Acceptable. †Not acceptable.
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