REFERENCE AND REJECTION VALUES FOR CHARACTERISTICS OF THE COAL No. Characteristic ASTM Standard (Current) Unit Reference Value Rejection Value Remarks 1 Gross Calorific Value D – 2015 or D – 3286 Kcal/kg 6400 Less than 6100 As received 2 Volatile Matter D – 3175 % 30 Greater than 43 Less than 26 Dry coal basis (d.c.b.) 3 Total Moisture D – 3302 % 10 Less than 6 Greater than 15 Percent by weight of coal on as-received basis 4 Ash D – 3174 % 10 Greater than 15 (d.c.b.) 5 Total Sulphur D – 3177 or D – 4239 % 0.40 Greater than 0.69 (d.c.b.) 6 Chlorine D – 2361 % 0.1 Greater than 0.15 (d.c.b.) 7 Slagging Index , Rs (1) (2) (3) (4) (5) Dimen- sionless 1.0 Greater than 1.5 Bituminous Ash Note 1 ?C 1400 Less than 1232 Lignitic Ash Note 1 No. Characteristic ASTM Standard (Current) Unit Reference Value Rejection Value Remarks 8 Fouling Index , Rf (1) (2) (3) (4) (5) Dimen- sionless 0.3 Greater than 0.5 Bituminous Ash Note 1 % wt. 0.5 Greater than 1.0 Lignitic Ash Note 1 9 Ash Fusibility Temperatures (reducing atmosphere) D-1857 ?C HT-1430 Less than: IT-1150 ST-1200 HT-1250* FT-1350 *HT – 1220 for coal with less than 5% ash(d.c.b.) 10 Hardgrove Grindability Index (HGI): Gross Caloric Value: D-409 Dimen-sionless Less than: 6200-6299 Kcal/kg 58 50 6300-6499 Kcal/kg 57 49 6500-6699 Kcal/kg 56 48 >6700 Kcal/kg 54 47 11 Size of Coal D-431 mm 30 0 to 0.5- Greater than 15% 0 to 5- Greater than 50% D-410 30 to 50- Greater than 10% 50 to 75- Greater than 2% Over 75- Greater than 0% Notes: 1. Bituminous Ash Fe203>MgO+CaO Lignitic Ash Fe2O3<MgO+CaO 2. A = SiO2 + Al2O3 + TiO2 B = Fe2O3 + CaO + MgO + Na2O + K2O (Concentration of components in wt. % as per ash analysis). 3. For coal with Bituminous type ash: Rs = B/A ? Sulfur Rf = B/A ? Na2O 4. For coal with Lignitic type ash: HT = Ash Fusibility Temp-Hemispherical (?C – Oxidizing Atmosphere) IT = Initial Temperature (?C – Reducing Basis) Rf = Na2O 5. 0.91
