Biomedical Engineering Reference
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c. For torrefied biomass in similar way, we get that 1 kg torrefied biomass
needs 8.27 kg wet air and produces 9.60 kg flue gas and releases 21.9 MJ
heat.
So, for 1 MJ energy input in the energy the furnace needs (8.27/21.9) or
0.377 kg air and produces (9.6/21.9) or 0.438 kg flue gas. Figure 10.4 plots
these data against C/H ratio of fuels.
Results are listed in the table below:
Bituminous
Coal
Torrefied
Biomass
Raw
Biomass
Energy density of fuel (MJ/kg)
28.91
21.9
13.97
Mass of flue gas produced for per unit
heat release (kg/MJ)
0.416
0.438
0.476
Wet air needed to burn unit mass of
fuel (kg/kg)
11.22
8.27
5.48
Air required per unit energy release
(kg/MJ)
0.39
0.38
0.39
Flue gas produced per unit fuel burnt
(kg/kg)
12.03
9.60
6.66
Energy carried by unit mass of flue
gas (MJ/kg)
2.40
2.28
2.09
It is interesting to note that while wet air required for unit heat release is
nearly independent on the fuel type, the amount of flue gas produced per unit
energy input depends much on the fuel type. Raw biomass has higher flue gas
weight than coal, but torrefied biomass produces mass of flue gas per unit heat
release comparable to that of coal.
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