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preheater and pre calciner.............................................................................................................
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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
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