Environmental Engineering Reference
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stand-off distance was slightly longer for the high-velocity coal gun. Burnout level in
the flue gas for both the flames was higher than for the baseline case (see Figure 2.122 ) .
At all three tested transport air mass flows, the burnout shows an increase from
the low-velocity coal gun to the high-velocity coal gun. The coal jet momentum
effect on the flue gas burnout level is summarized in Figure 2.124 . In this figure the
100
98
96
94
Low Velocity Gun
High Velocity Gun
in the baseline coal gun configuration:
92
90
80
100
120
140
160
180
200
220
240
Coal Transport Air Mass Flow, kg/h
FIGURE 2.122 Burnout level for high- and low-velocity coal guns at different coal transport
air mass flow.
FIGURE 2.123 High coal transport air mass flow for low- (left) and high- (right) velocity
coal gun.
coal jet momentum is reported on the x-axis; it should be pointed out that in flames
considered here the momentum is changed in two different ways:
1.
Changing the coal gun type (low- and high-velocity coal gun)
2.
Changing the transport air mass flow (from 80 up to 215 kg/h)
 
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