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OnLine FORMULAE (Return to main list of Formulae)
BIOMASS COMBUSTION TECHNOLOGY (1)
AIR REQUIREMENTS
In a biomass combustion plant the air requirement per kg of fuel is given by the following formula:
| |
l |
|
22,41 |
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8 |
|
| VL = |
------- |
x |
------- |
x ( |
--- |
x C + 8 x H + S - O) |
| |
0,21 |
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32 |
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3 |
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Where:
- VL : Air requirement in m3 air/kg fuel
- l: Ratio theoretical to practical air requirement > 1 normally 1.5 - 2.3 C: Mass fraction of Carbon in the fuelH: Mass fraction of Hydrogen in the fuelS: Mass fraction of Sulphur in the fuelO: Mass fraction of Oxygen in the fuel
- With the supplementary condition that
C+H+S+O < 1
Some practical values of these data are indicated in the following table
Ultimate analysis of some biomass fuels
| Fuel |
Carbon |
Hydrogen |
Nitrogen |
Sulphur |
Oxygen |
| Straw |
0.45-0.494 |
0.06 |
0.004-0.066 |
0.0012 |
0.43-0.442 |
| Wood without bark |
0.47 |
0.063 |
0.0016 |
0.0002 |
0.46 |
| Bark |
0.47 |
0.054 |
0.004 |
0.0006 |
0.4 |
| Wood with bark |
0.47 |
0.06 |
0.003 |
0.0002 |
0.44 |
| Oak wood |
0.494 |
0.063 |
00 |
00 |
0.445 |
| Pines wood |
0.499 |
0.063 |
00 |
00 |
0.438 |
| Triticale |
0.434 |
0.063 |
0.0131 |
0.0022 |
0.4779 |
| Miscanthus |
0.46 |
0.06 |
0.007 |
0.002 |
0.44 |
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