Table 2.
Proximate and ultimate analysis of coal samples from Durgapur fields.
| Proximate analysis | Standards | Well – A | Well – B | Well – C | Well – D | Well – E |
|---|---|---|---|---|---|---|
| Inherent moisture (%) | IS:1350 (Pt-I) 1984 Reaff-2007 | 0.13 | 0.01 | 0.11 | 0.13 | 0.17 |
| Ash (%) | IS:1350 (Pt-I) 1984 Reaff-2007 | 19.25 | 12.51 | 11.38 | 12.51 | 13.59 |
| Total moisture content (%) | IS:1350 (Pt-I) 1984 Reaff-2007 | 3.49 | 4.69 | 2.50 | 3.73 | 1.71 |
| Volatile matter (%) | IS:1350 (Pt-I) 1984 Reaff-2007 | 33.25 | 31.91 | 32.64 | 33.97 | 32.14 |
| Fixed carbon (%) | IS:1350 (Pt-I) 1984 Reaff-2007 | 44.14 | 51.26 | 53.59 | 49.92 | 52.73 |
| Ultimate analysis | ||||||
| Carbon (%) | IS:1350 (Pt-IV/Sec-I) 2011 | 57.19 | 62.33 | 65.97 | 64.77 | 65.70 |
| Hydrogen (%) | IS:1350 (Pt-IV/Sec-I) 2011 | 3.87 | 4.03 | 4.14 | 4.08 | 4.06 |
| Nitrogen (%) | IS:1350 (Pt-IV/Sec-I) 2011 | 1.40 | 1.50 | 1.26 | 1.28 | 1.25 |
| Sulfur (%) | IS:1350 (Pt-III) 2011 | 0.32 | 0.37 | 0.43 | 0.47 | 0.33 |
| Oxygen (%) | IS:1350 (Pt-II) 1970 Reaff-2002 | 12.68 | 13.72 | 13.29 | 12.04 | 12.17 |
| Mineral matter (1.1XA) (%) | IS:1350 (Pt-I) 1984 Reaff-2007 | 21.18 | 13.37 | 12.52 | 13.76 | 14.95 |
| Moisture content (%) | IS:1350 (Pt-I) 1984 Reaff-2007 | 3.36 | 4.68 | 2.39 | 3.60 | 1.54 |
| Gross calorific value, Kcal/Kg | By difference | 5376 | 5859 | 6202 | 6088 | 6108 |