Welcome, Saturday, Nov 17, 2018

Coal and Coke

STC is a regular and large importer of coal and coke. The coal is supplied mainly to power generation companies like NTPC, GSECL, APGENCO, NALCO, TNEB etc.

It has imported 27.15 MMT of Coal & Coke valued Rs 16,869 crore in the past few years.

Typical Specifications of imported products:

Steam coal

Parameter Typical Specification
Total Moisture (ARB) 7-10% by weight
Inherent Moisture (ADB) 2-5% by weight
Volatile Matter (ADB) 26-35% by weight
Ash Content (AD) 10-15% by weight
FC/VM (ADB) 1.4-2.0
Sulphur (ADB) 0.2-0.6% by weight
GCV (ARB) 6100 to 6800 Kcal/Kg
GCV (ADB) 6400-7000 Kcal/Kg
HGI 45-55
Size 0-50 mm
AFT (IDT/HT/FT) (+1300/+1390/+1480)

Hard coking coal

Parameter Typical Specification
Ash (ADB) 10% max
Total Moisture (ARB) 10% max
Inherent Moisture (ADB) 1% approx.
Volatile Matter (ADB) 20% approx.
Sulphur (ADB) 0.4% max
CSN 7 approx
Size 0-50 mm

Lam coke

Parameter Typical Specification
Ash (DB) 12-13% max (% by weight)
Moisture (ARB) 5% max (% by weight)
Volatile Matter (BD) 1.5% max (% by weight)
Sulphur (BD) 0.6% max (% by weight)
Phosphorus (DB) 0.035% max (% by weight)
CSR 62% Min
CRI 24%-26% max
M40 80% Min
M10 6% max
Mean Size 55 mm Min

Met coke

Parameter Typical Specification
Ash (DB) 12% max (% by weight)
Moisture 5% max (% by weight)
Volatile Matter (BD) 1.5% approx. (% by weight)
Sulphur (BD) 0.6% approx. (% by weight)
Phosphorus (DB) 0.035% max (% by weight)
CSR 62% Min
CRI 24%-26% max
M40 80% Min
M10 9% max
Fixed Carbon 85 Min