DESIGNED CRITERIA OF PREHETER TOWER

SectionSection ParameterParameterPreheater riser duct gas velocity 14 - 15 m/secCyclone inlet gas velocity 12 - 14 m/secCyclone outlet (immersion tube) gas velocity

11 - 12 m/sec

PH outlet duct gas velocity 12 - 14 m/secImmersion tube diameter (0.6 - 0.7) * cyclone

diameterImmersion tube height (except top cyclone)

Half of inlet duct height

Immersion tube height (top cyclone)

70 to 100% of inlet duct height

PREHEATER CYCLONES DESIGNED LOADING

PARAMETERS

Loading (tpd/m2) at

Cyclone No.

6, 5, 4

Cyclone No.2, 3

Cyclone No.1

Cyclone body 85 – 90 90 – 97 95 – 100

Cyclone inlet 388 – 430 410 – 440 410 – 450

Cyclone outlet 305 – 320 350 – 375 330 – 350

PRECALCINER DESIGNED CRITERIA

Coal feeding point should be 300 mm below the material feeding point

SLC Calciner, tertiary air gas velocity just below the coal entry point should not be below 35 Mtr/Sec.

Before coal feeding point at least 2 Mtr vertical portion duct should be available both for ILC & SLC

PRECALCINER DESIGNED CRITERIA

Preferably coal should be fed in Calciner in multi-points entry, say 2/3 positions

Material feed chute Thermal loading in Calciner Volumetric loading in Calciner