Environmental Engineering Reference
In-Depth Information
1.0
ξ
ζ
= 0.0 ,
= 0.1
h
m
0.8
0.6
α
= 1.0
0.4
0.2
α
= 0.5
0.0
0
1
2
3
4
5
6
Gas recirculation ratio, R ( m / m )
rec
in
FIGURE 2.27
Thermal efficiency of the model furnace affected by gas recirculation and its
heat loss.
2500
Available zone
2000
(at
)
ξ
= 0.5
h
T
f
max
1500
1000
Blowoff zone
T
f
max
( at
)
ξ
= 0.0
h
500
ζ
=0.1
m
0
0
1
2
3
4
5
6
Gas recirculation ratio, R ( m / m )
rec
in
FIGURE 2.28
Maximum combustion gas temperature of the model furnace affected by gas
recirculation and heat recirculation.
) was also calculated and plotted as
a function of
T
in
1
and gas recirculation ratio,
R
, with the condition of ξ
h
less than 0.9.
The contour lines of ∆
T
from 100 to 1000˚C divided into nine zones are shown in
Figure 2.30
.
This mapping implies there is an area where the temperature difference
In addition to this mapping, ∆
T
(=
T
fmax
-
T
out
Search WWH ::
Custom Search