Selection of Cement Silo configuration
(all costs are in lacs)
S. N. Description 3 x 5000 2 x 7500
No of
SiloCost /
SiloTotal
CostNo of
SiloCost /
SiloTotal
Cost
1 Civil cost 3 556.55 1669.65 2 735.67 1471.34
2 Mechanical cost 3 86 258 2 137 274
Total Capital cost 1927.65 1745.342.3 Fly Ash Silo Capacity
In the present scenario, due to huge demand of PPC, many cement plants have
established fly ash silos with capacity ranging from 750 to 5000 tones. In general,
the fly ash silo capacity should have one-day storage; however, the capacity is
decided based on the location of available source of dry fly ash. If receipt of Fly ash
is round the clock in cement plant, then probably only a buffer hopper may be
needed. If not which may happen due to transport problem, non-availability of Fly
ash at lifting point especially in night shifts in power plants, the storage capacity
has to be increased at least by one day.
Holtec proposes to have a storage capacity as per the following formula;
(PPC production per annum/annual working days) x % Fly ash in product X Storage
days
If 3 days storage capacity is considered, then the capacity will be approx.5000 MT.
A comparative statement of both capacities of silos showing various parameters is
shown below;
Item UOM (In Rs.)R a t e Qty. in (Lakhs)Amount Qty. Amount in (Lakhs) Increase in price
Fly Ash Silo Ca-
pacity (MT) MT 3000 FAS 5000 FAS in Cost. Rs. Difference
Size Mtrs x Mtrs (14m D x 37 m H) (16m D x 45m H) in Lacs
Civil Cost
Super Structure
RCC M3 9000 700 63 1060 95.4 Composite rate taken
Reinforcement MT 54000 112 60.48 200 108
Shuttering M2 1500 4000 60 5450 81.75
Cement bag 350 6300 22.05 9540 33.39
Miscellaneous
other item^60 100
T O T A L (A) 265.53 418.54