Environmental Engineering Reference
In-Depth Information
O
2
ratio:0.8
O
2
vol.%:21
Vitiated air temp.:1300K
25
WT coal
3000
20
2500
CO
2
O
2
15
2000
TP
mean
1500
10
1000
5
CO
500
H
2
0
0
0.3
0.6
0.9
1.2
Distance from injection point, m
O
2
ratio:0.8
O
2
vol.%:21
Vitiated air temp.:1300K
100
WT coal
VM
80
60
FC
40
20
0
0
0.3
0.6
0.9
1.2
Distance from injection point, m
FIGURE 2.96
Change of reaction ratio of concentration of generated gas, average particles
temperature, volatile matter (VM), and fixed carbon (FC) as a function of distance from the
injection point along the center of the furnace.
where
k
0
is the frequency factor,
E
is the activation energy,
R
is the gas constant,
and
T
p
is the average temperature of particles.
When pulverized coal is reacted under various test conditions, the relation
between the obtained rate constant of emission of volatile matter and reciprocal
of particle temperature, which is the so-called Arrhenius plot, can be obtained, as
difference can be observed. This means the emission rate of volatile matter at the
reaction field of high particle temperature over 2000 K was not affected by the
type of coal.
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