avoid jamming as far as possible low inclined chutes are required to be
provided between conveyors and valley angles of hoppers, it should be kept
min.70 deg. Further, the SS liners (for abrasive material) or Polymer liners
(for sticky material) should be provided for easy flow of material. No MS
liners should be provided in the hoppers as the welding of the liners causes
the buildup of the material and thus jamming of the hoppers.
The mill inlet also is prone to jamming, hence the provision for the three flap
gate and hot gas connection helps to avoid the jamming and improves the
availability of the mill in case of VRM installations.
2.1.3 Cost Comparison
We have taken the typical example of the 10000-ton storage silo V/s 15000-ton
storage silo. As mentioned in the below sheet, the difference of civil cost is approx.
Rs.262 Lacs. The major mechanical cost is of Bucket elevator which will in crease
by Approx.Rs.50 Lacs.
The total difference of cost between the 10000 tons and the 15000 tons is Approx.
Rs.313 Lacs including civil, structure and equipment cost.
The operating cost of the 15000 tons blending silo is approx.Rs.22 Lacs higher than
the 10000 tons per annum.
Item UOM (In Rs.)R a t e Qty. Amount in (Lakhs) Qty. Amount in (Lakhs) Increase in price
Kiln Capacity tpd 6500 9500
Blending silo
Capacity MT^1000015000
Storage days Days 1.5 1.5
Blending silo
Size Mtrs x Mtrs (18m D x 46m H) (20 m D x 57.2 m H)
Civil Cost
Super-Structure
Concrete M3 9000 1629 146.61 2056 185.04 Rates TakenComposite
Reinforcement MT 54000 297 160.38 382 206.3
Pre-stressing
cables MT^200000 - - - -
Shuttering M2 1500 5700 85.5 7200 108
Cement bag 350 14500 50.75 20560 71.98
Total A 443.24 571.3
Foundations
Concrete in Raft M3 5000 1780 89 1992 99.6 Rates TakenComposite
Reinforcement MT 54000 243 131.22 269 145.26
Shuttering M2 600 4450 26.7 4980 29.88
Cement Bag 350 15845 55.45 17730 62.05
Total B 302.37 336.79