Design Guidelines for High Performance Industrial Furnaces - High Temperature Air Combustion: From Energy Conservation to Pollution Reduction - page 285

TABLE 5.17
Operational Conditions

Reheating tonnage 250 ton/h

Discharging temperature 1150˚C

Difference of temperature at the time of discharge 30˚C

Steel thickness 250 mm

Steel width 2000 mm

Steel length 9000 mm

Intervals between steels 100 mm

Temperature of steel at the time of charging 20 and 600˚C

1500

MG1750
MG2000
MG2800
COG
LNG
LPG

Heat recovery
rate of heating
exchanger %
62
67
74
80
82
83

Calorific value
MJ/m

1400

Gas

3 N

1300

MG1750
MG2000
MG2800
COG
LNG
LPG

7.37
8.42
11.74
18.07
35.82
90.50

1200

1100

1000

900

0 20 40 60 80

Furnace length, m

FIGURE 5.48 Effect on fuel consumption of different calorific values and furnace lengths.

1500

Discharging temperature
1250 ° C
1200
1150

1400

1300

1200

1100

1000

900

0 20 40 60 80 100

Calorific value, MJ/m 3 N

FIGURE 5.49 Calorific values and fuel consumption.