Environmental Engineering Reference
In-Depth Information
0.70
100
90
0.68
0.66
80
0.64
70
0.62
60
0.60
50
without
partition wall
with
partition wall
without
partition wall
with
partition wall
FIGURE 5.4
Partition wall effect on heating efficiency and temperature deviation.
3.0
0.5
0.75
partition wall
0.12pitch
0.6
unit m
FIGURE 5.5
Measurement locations.
effect of the intermediate wall to the gas recycling inside the furnace, the wind
velocity along the line of burner axis is measured and the volume of wind that passes
through is calculated, to obtain the recirculation ratio. This ratio is shown in
Figure
5.9
,
and the direction of the gas flows is shown in
Figure 5.10
.
The actual measurement of temperature distribution was made using the setup
shown in
Figure 5.11
. The gas burned was city gas 13A; the combustion capacity
was 230 kW, and the air ratio 1.1. The results of these actual measurements and the
analyses are shown in
Figure 5.12
.
The difference of absolute temperature values
between the two is fairly large, but the general trend is similar. The results of analyses
are summarized in the furnace temperature distribution, heat flux distribution, heat
flux improvement ratio, and heat flux deviation, and are shown in
Figures 5.13
and
5.14
.
The results showed that the deviation of the temperature inside the furnace is
reduced by the intermediate partition wall. A longer partition wall makes the average
furnace temperature higher. A longer partition wall also causes an increase in the
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