Environmental Engineering Reference
In-Depth Information
1060
1060
HiTAC A,B Burner
Conventional A Burner
HiTAC C,D,E,F Burner
Conventional C,D Burner
1040
1040
T=61˚C
1020
1020
T=52˚C
T=51˚C
1000
1000
980
980
T=75˚C
960
960
a
b
c
d
e
a
b
c
d
e
940
940
-400
-200
0
200
400
-400
-200
0
200
400
Position, mm
Position, mm
FIGURE 5.22
Comparison of the temperatures on the steel surface at the locations on two
sides centering skids. (Conditions: furnace capacity = 40 ton/ch; fuel = A-type heavy oil;
escape ratio = 15%.)
Recirculation
Fan
Run only this part
Water
Cooling
Hot Flue Gas
Cold Flue Gas
Device for forcing circulation of the exhaust gas
FIGURE 5.23
Device for forced circulation of the furnace gas.
increase of the ion current near the skids in the case of combustion with high
temperature air.
2. Temperature difference near the skids
When combustion flames with normal air were formed near the water-cooled skids,
the temperature of steel at the location in direct contact with the skids rose higher
than in the case of normal combustion where the flames were not formed near them.
But the temperature of steel at the location away from the skids also rose and, as a
result, the reduction of ∆
T
of the steel was small. This is probably explained by the
flames locally existing near the skids as indicated by the ion current. The potential
core of a jet depends on the diameter of the nozzle, and the length of the potential
core was shortened making the jet two dimensional by using an air jet nozzle shaped
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