Practical Combustion Methods Used in Industries - High Temperature Air Combustion: From Energy Conservation to Pollution Reduction - page 218

T ABLE 4.2

Energy Savings and Expected Values of Energy Saved

Energ y Reduction Objectives Expected Values of Energy Saved

Heat
Contained in
Steel
Materials

Heat
Loss to
Waste
Gas

Heat
Loss to
Cooling
Water

Heat Loss
to
Radiation

Value of Energy
Saved Value for

Countermeasures Classification Energy Saving ( × 10

3

kcal/t) Remarks

Impro ving of

installations

1. Direct rolling 100% 500

2. Hot char ging Char ging at 500˚C 100

3. Extending of the furnace length × × Extending by 10% 40

4. Augmenting of thermal insulation +30% 5 Fiber -veneering

5. Double insulation of skids caster/ fi ber 1 35

6. Locking of openings -m

2

25 Including a shortening of

time for opening/closing
the doors

7. Controlling of low air ratio O , -10% 10

2

Reco vering of

waste heat

1. Preheating of air Preheating the air at 300˚C 75

2. Preheating by jet impinging Preheating the steel 65

materials at 300˚C

3. Cooling by e vaporation V aporizing of the total

amount of water for
cooling skids

60 Evaluation; 800 kcal/kg

of steam

4. W aste heat boiler Increasing the v apor by 0.1 80

t/t of steel

5. Preheating of gas Preheating the g as at 300˚C 12