Combustion Phenomena of High Temperature Air Combustion - High Temperature Air Combustion: From Energy Conservation to Pollution Reduction - page 58

0.65

0.60

T f max = 1600
ζ

C

0.55

= 0.1

m

α = 0.95

0.50

0.45

0.40

0 1 2 3 4 5 6

Gas recirculation ratio, R ( m / m )
rec in

FIGURE 2.32 Combustion gas temperature in the model furnace affected by gas recirculation
when the maximum temperature is kept constant.

2400

α = 0.9
ζ

Over temperature zone

= 0.1

2200

m

ξ < 0.9

h

2000

Heat exchange limit

1800

1600

1400

1200

Blow off zone

1000

0 1 2 3 4 5 6

Gas recirculation ratio, R ( m / m )
rec

in

FIGURE 2.33 Thermal efficiency affected by gas and heat recirculation when the maximum
temperature is kept constant.