12.3.4 Pyrolysis of Teak Sawdust at 600
C
Figure 12.7 shows the weight of residue as a function of time at 600
C. Initial
weight of teak sawdust is 1 g. As pyrolysis proceeds, reduction in weight of biomass
is observed due to formation of gases and volatiles leaving behind unconverted
biomass and char as residue. Pyrolysis reaction is completed after 70 min which is
indicated from the constant weight of residue. Bio-char produced from pyrolysis at
600
C for 70 min was 0.407 g. Finally, negligible quantity of unreacted teak
sawdust (1–2 mg) was observed because of their high surface area (Fig. 12.8).
y = -0.0338x - 3.7138
R² = 0.9993
-7
-6
-5
-4
-3
-2
-1
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70
ln (-dW/dt)
Time (min)
Fig. 12.6 A graph showing the calculation of rate constants from experimental data at 500
C
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85
)
g
(
e
u
d
i
s
e
r
f
o
t
h
g
i
e
W
Time (min)
Fig. 12.7 Weight of residue of teak sawdust as a function of time at 600
C
12 Modelling and Simulation of Pyrolysis of Teak (Tectona Grandis) Sawdust
333