Coal ranks and caloric value
COALS OF YUZHNY subsoil plot of SOLNTSEVSKIY deposit on SAKHALIN ISLAND
Petrographic composition
- fusenite 1–3%
- liptinite 3–4%
- mixtinite 6–7%
- vitrinite 84–91%
Coal quality rates fluctuation limits
Moisture of analysis sample (Wa, %) | 2,2 - 11,6 |
Moisture of fired fuel (Wtr, %) | 10,2 - 22 |
Maximum moisture-holding capacity (Wmax, %) | 10,4 - 24,9 |
Ash content of dry coal (Ad, %) | 5,6 - 25 |
Dry ash-free coal volatile-matter yield (Vdaf, %) | 37,0 - 51,3 |
Higher calorific value of dry ash-free coal (Qsdaf, kcal/kg) | 6100 - 7450 |
Higher calorific value of dry ash-free coal (Qsdaf, MJ/kg) | 25,54 - 31,19 |
Lower calorific value of as-fired fuel (Qir, kcal/kg) | 3600 - 6000 |
Lower calorific value of as-fired fuel (Qir, MJ/kg) | 15,07 - 25,12 |
Total sulfur content in dry coal (Std, %) | 0,12 - 0,64 |
Carbon content in dry ass-free coal (Cdaf, %) | 60,3 - 75,3 |
Hydrogen content in dry ass-free coal (Hdaf, %) | 4,1 - 6,2 |
Physical and mechanical properties of coals
- 5,5–65%mechanical strenght index
- 1,36–0,58grindability factor
- 32,9–44,3%thermal stability index
Chemical composition of coil ash
- SiO233,7–63,7%
- Al2O319,2–35,1%
- Fe2O33,1–13,0%
- CaO2,6–16,7%
- SO30,6–6,3%
- Na2O30,2–6,0%
- P2O50,2–3,6%
- MgO0,6–3,0%
- TiO20,8–2,4%
- K2O30,4–1,7%
- MnO0,8%
- MnO0,8%
Coal ash properties
Low fusibility
Average ash-fusion temperature
1237
C°
deformation start
>1472
C°
softening
>1446
C°
melting
5,4
average fusibility rate
Baseline slagging power
of boiler units heating area
Rs = 0,05
Baseline contamination
of boiler units heating area
Rs = 0,05
Shipped coal quality
Ash content (air-dried condition), % | 17,0 |
Total moisture (as-fired condition), %. | 19,0 |
Volatiles (air-dried condition), % | 38–42 |
Total sulfur (air-dried condition), %, % | 0,10–0,50 |
Higher calorific value (air-dried condition), kcal/kg | 5500 |
Lower calorific value (as-fired condition), kcal/kg | 4700 |