Design Guidelines for High Performance Industrial Furnaces - High Temperature Air Combustion: From Energy Conservation to Pollution Reduction - page 259

70

C-Burner

P1-P6
P2-P7
P3-P8
P4-P9
P5-P10
Averaged
Data

Normal combustion

65

A-Burner

P5 P4 P3 P2 P1

60

P10 P9 P8 P7 P6

No.4 No.3 No.2 No.1

55

100

420 440 620 480

Combustion with high temperature air

E-Burner

50

0 5 10 15

Ion probes (No.1 to 3) average output,V mV

FIGURE 5.20 Output voltage of average ion current and the difference of temperatures on
the steel surface (units = mm).

CDEF Burner HiTAC CD Burner Conventional

D C D C

B A B A

F E F E

FIGURE 5.21 Locations of side burners and combustion.

furnace gas, a rectangular jet nozzle was used, and by shortening the distance to the
confluence point of fuel and air, their mixing near the burner was improved. This
was because the steel temperature near the skids and the ion current value were
almost the same as they were when burners of original shape were used. When a
device to circulate the exhaust gas by force (shown in Figure 5.23 ) was used under
and near the skids, the steel temperature where it was in direct contact with the skids
rose both for the cases of combustion with normal air and with hot air, and the
temperature difference became smaller. It was also noted that there was a slight