technical NOTES

S.N. Description UOM Cold

Fog

Bag

filters

Water

spray with

Chemical

Dry fog with

compressed

air

12 Moisture ingress in

system

% 0.02-

0.03

Nil 1.2 0.1

13 Water consumption m3/hour 2.5 Nil 30 4

14 Chemical consumption

(Indion 6282)

liters/hour Nil Nil 12 Nil

15 Chemical cost Rs/liters Nil Nil 300 Nil

Total Installed Cost Rs.in Lacs 100 127 46 136

Operating Cost

1 Power Consumption KW 11.19 158 22 150

2 Running hours Hours 16 16 16 16

3 Power tariff Rs./Kwh 4.5 4.5 4.5 4.5

4 Power Cost/Annum Rs.in Lacs 2.7 37.5 5.2 35.6

5 Chemical consumption

cost/Annum

Rs. In Lacs Nil Nil 190 Nil

Total Operating cost/

Annum

Rs.in Lacs 2.7 37.5 195 36

6.6 Conclusion
In the bag filter system at transfer points and at crusher house, the dust collected
in the bag filter is discharged in the next conveyor thus resulting into dust emission
at next discharge point. Where as in the water spray system with Cold Fog, the
dust particles density increases resulting in to less dust generation at next
discharge point thus reducing the overall dust emission in the system.

From the above facts, it is better option to go in for Cold fog system in limestone
and additive material handling for better pollution control as well as less operating
cost.