THERMAL GALLERY

12 December 2011

FUEL GRADES & GCV ‘S

I.COAL GRADES :
The gradation of non-coking coal is based on Useful Heat Value (UHV), the gradation of coking coal is based on ash content  and for semi coking / weakly cokng coal it is based on ash plus moisture content , as in vogue as per notification
Grades of Coking Coal:

Grade
Ash Content
Steel Grade –I
Not exceeding 15%
Steel Grade -II
Exceeding 15% but not exceeding 18%
Washery  Grade -I
Exceeding 18% but not exceeding 21%
Washery  Grade -II
Exceeding 21% but not exceeding 24%
Washery  Grade -III
Exceeding 24% but not exceeding 28%
Washery  Grade -IV
Exceeding 28% but not exceeding 35%


Grades of Non-coking Coal:


Grade
Useful Heat Value (UHV)
(Kcal/Kg)
UHV= 8900-138(A+M)
Corresponding
Ash% + Moisture % 
at (60% RH & 40 C)
Gross Calorific Value(GCV)
 (Kcal/ Kg)
(at 5% moisture level)
A
Exceeding  6200
Not  exceeding 19.5
Exceeding 6454
B
Exceeding 5600 but not exceeding  6200
19.6 to 23.8
Exceeding 6049
but not exceeding 6454
C
Exceeding 4940 but not exceeding 5600
23.9 to 28.6
Exceeding 5597
but not exceeding. 6049
D
Exceeding 4200 but not exceeding 4940
28.7 to 34.0
Exceeding 5089
but not Exceeding 5597
E
Exceeding 3360 but not exceeding 4200
34.1 to 40.0
Exceeding 4324
 But not exceeding 5089
F
Exceeding 2400 but not exceeding 3360
40.1 to 47.0
Exceeding 3865
but not exceeding. 4324
G
Exceeding 1300 but not exceeding 2400
47.1 to 55.0
Exceeding 3113
but not exceeding 3865


Grades of Semi-coking and Weakly Coking Coal:


Grade
Ash + Moisture Content
Semi coking grade –I
Not exceeding 19%
Semi coking grade –II
Exceeding 19% but not exceeding 24%


Grades of NEC Coal :

Grades
UHV (Kcal/Kg)
Corresponding
Ash% + Moisture %age
A
6200-6299
18.85 – 19.57
B
5600 – 6199
19.58 – 23.91

II.BIO-MASS FUELS:

 SNo
Fuel
Approx heating value Kcal/Kg
Natural State
Dry
state
1
Wood
1500
3500
2
Cattle dung
1000
3700
3
Bagasse
2200
4400
4
Wheat and rice straw
2400
2500
5
Cane trash, rice husk, leaves and vegetable wastes
3000
3000
6
Coconut husks, dry grass and crop residues
3500
3500
7
Groundnut shells
4000
4000
8
Coffee and oil palm husks
4200
4200
9
Cotton husks
4400
4400
10
Peat
6500
6500





III.FOSSIL FUELS:

1
Coal
4000-7000
2
Coke
6500
3
Charcoal
7000
4
Carbon
8000
5
Fuel oil
9800
6
Kerosene and diesel
10000
7
Petrol
10800
8
Paraffin
10500
9
Natural gas
8600
10
Coal gas
4000
11
Electrical (Kcal(KW)
860
12
Bio gas(Kcal/cu mtr) (12 kg of dung  produces 1 cu. Mtr gas)
4700-6000
 
 
 

 IV.OILS
LDO (As Per IS 1460-1974) : It is generally used for start up of boiler

Description
Values
Relative Density @15oC/15oC
0.85
Flash Point PMCC oC min
38oC
Kinematic Viscosity CST
2 to 7.5
Sulphur %by weight max
1%
Ash weight max
0.02
Gross calorific value Kcal/Kg(Average)
10720


LSHS/HFO (As Per IS 1593-1971) :
It is generally used for Warm up & flame stabilization of boiler.


Description
Values
Relative Density @15oC/15oC
0.9579
Flash Point PMCC oC min
66oC (min)
120oC (min)
Kinematic Viscosity CST
500 CST max
Pour Point oC max
72oC
Sulphur %by weight max
4.5%
Sediment % by weight Max
4.5%
Ash weight max
0.1
Water content % Vol .Max
1.0
Gross calorific value Kcal/Kg(Average)
10000