| Coal | Lignite | Peat | Wood | |
Chemical composition | |||||
Carbon (C) | weight % | 76 - 87 | 65 - 75 | 50 - 60 | 48 - 55 |
Hydrogen (H) | weight % | 3.5 - 5.0 | 4.5 - 5.5 | 5 - 7 | 6 - 7 |
Oxygen (O) | weight % | 3 - 11 | 20 - 30 | 30 - 40 | 38 - 43 |
Nitrogen (N) | weight % | 0.8 - 1.2 | 1 - 2 | 0.5 - 2.5 | <0.6 |
Sulphur (S) | weight % | 1 - 3 | 1 - 3 | 0.1 - 0.4 | 0.02 - 0.06 |
Fuel properties | |||||
Volatile matter | weight % | 10 - 50 | 50 - 60 | 60 - 70 | 75 - 85 |
Ash | weight % | 4 - 10 | 6 - 10 | 2 - 15 | 0.1 - 2.0 |
Bulk density | kg/m3 | 728 - 880 | 650 - 780 | 300 - 400 | 320 - 420 |
Effective calorific value of dry substance | MJ/kg1 | 28 - 33 | 20 - 24 | 20 - 23 | 17 - 20 |
1 MJ/kg = 239 Kcal/kg |
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