| |
Theory For Single Coal Combustion
At moderate temperature and for small particle, the oxygen mass fraction at the surface is given by
|
| 
|
--------(11) |
B is the mass transfer number
|
|
--------(12) |
The carbon sphere burning rate is also governed by
 Law |
|
 where
 is the carbon burning constant. |
| |
| Table: Combustion properties of slid spheres [7] |
Fuel
|
 (g/cm3)
|
MWfuel
|
B.Pfuel (ºC)
|
f
|
Boxygen
|
Bair
|
Aluminium
|
2.70
|
27.0
|
2.467
|
1.12
|
1.12
|
0.26
|
Boron
|
2.34
|
10.8
|
2.550
|
0.451
|
0.451
|
0.105
|
Carbon
|
1.50
|
12.0
|
4.827
|
0.75
|
0.750
|
0.174
|
Carbon
|
1.50
|
12.0
|
4.827
|
0.375
|
0.375
|
0.087
|
Magnesium
|
1.74
|
24.3
|
1.107
|
1.107
|
1.520
|
0.353
|
Zirconium
|
6.44
|
91.2
|
3.578
|
3.578
|
2.850
|
0.662
|
|
|
