Coal ranks and caloric value

COALS OF YUZHNY subsoil plot of SOLNTSEVSKIY deposit on SAKHALIN ISLAND

Petrographic composition

Petrographic composition
  • fusenite
    fusenite 1–3%
  • liptinite
    liptinite 3–4%
  • mixtinite
    mixtinite 6–7%
  • vitrinite
    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, ккал/кг) 6100 - 7450
Higher calorific value of dry ash-free coal (Qsdaf, МДж/кг) 25,54 - 31,19
Lower calorific value of as-fired fuel (Qir, ккал/кг) 3600 - 6000
Lower calorific value of as-fired fuel (Qir, МДж/кг) 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
  • 1,36–0,58
    grindability factor
  • 32,9–44,3%
    thermal stability index

Chemical composition of coil ash

  • SiO2
    33,7–63,7%
  • Al2O3
    19,2–35,1%
  • Fe2O3
    3,1–13,0%
  • CaO
    2,6–16,7%
  • SO3
    0,6–6,3%
  • Na2O3
    0,2–6,0%
  • P2O5
    0,2–3,6%
  • MgO
    0,6–3,0%
  • TiO2
    0,8–2,4%
  • K2O3
    0,4–1,7%
  • MnO
    0,8%
  • MnO
    0,8%

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