Design Guidelines for High Performance Industrial Furnaces - High Temperature Air Combustion: From Energy Conservation to Pollution Reduction - page 283

High performance furnace Conventional furnace

1800 1800

Heat recovery rate
40
60
80

Heat recovery rate
35
45
55

%

%

1600 1600

1400 1400

1200 1200

1000 1000

800 800

20 30 40 50 60 20 30 40 50 60

Furnace length, m

Furnace length, m

Effect of heat-recovery rate with charging at 300°C

High performance furnace Conventional furnace

1400 1400

Heat recovery rate
%

Heat recovery rate
35
45
55

40
60
80

%

1200 1200

1000 1000

800 800

600 600

400 400

20 30 40 50

Furnace length,

60 20 30 40 50

Furnace length,

60

m m

Effect of heat-recovery rate with charging at 600°C

FIGURE 5.46 Effects of heat recovery charging at 300 and 600 ˚ C to fuel consumption rate
in high performance furnace and conventional furnace.

2.0

1.8

1.6

1.4

1.2

1.0 0

20 40 60 80 100

Calorific value, MJ/m 3 N

FIGURE 5.47 Relationship between calorific values and exhaust gas/air.