COALS OF YUZHNY subsoil plot of SOLNTSEVSKIY deposit on SAKHALIN ISLAND

Intermediate group coals

rank 3B
lignites (brown coals)
rank D
bituminous coals (black coals)

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, 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:

deformation start — 1237°С;

softening — >1446°С;

melting — >1472°С;

Average fusibility rate — 5.4

baseline slagging power

of boiler units heating area — Rs = 0.05

baseline contamination

of boiler units heating area — Rf = 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