Combustion Phenomena of High Temperature Air Combustion - High Temperature Air Combustion: From Energy Conservation to Pollution Reduction - page 151

2.5.3.5 Input/Output Measurements

During the input/output measurements the effects of different parameters have been
investigated. The furnace conditions have been kept at the same level for all the
measured flames, the flue gas temperature was ~1100˚C and wall temperature
~1150˚C. Table 2.10 reports the outlet quantities for the baseline flame under these
furnace conditions.
Table 2.11 reports the input conditions in the different configurations. The
parameters that were investigated are:

1. Gun position
2. Transport air velocity
3. Transport air mass flow
4. Precombustor NO x level

The position of the coal guns (configuration) has been studied for the low- and
high-velocity coal guns (flames 1, 2, 3 and 8, 9, 10 in Table 2.11 ) . The transport air
mass flow has been studied in the baseline configuration for high and low coal gun
velocity (flames 2, 4, 5 and 5, 6, 7 in Table 2.11). The NO x level at the inlet has
been investigated in the baseline configuration with high-velocity coal gun (flames
11, 12, 13, 14, 15 in Table 2.11).

TABLE 2.11
Input/Output Conditions Measurements

Flame
No.

Transport Air
Mass Flow, kg/h

Transport Air
Velocity, m/s

Precombustor
NO x Level, ppm Configuation Coal Gun

1 ●● Low velocity 130 26 100

2 ●● Low velocity 130 26 100

3 ●● Low velocity 130 26 100

4 ●● Low velocity 215 45 100

5 ●● Low velocity 80 15 100

6 ●● High velocity 130 43 100

7 ●● High velocity 215 71 100

8 ●● High velocity 80 28 100

9 ●● High velocity 130 43 100

10 ●● High velocity 130 43 100

11 ●● High velocity 130 43 100

12 ●● High velocity 130 43 146

13 ●● High velocity 130 43 155

14 ●● High velocity 130 43 130

15 ●● High velocity 130 43 140