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Advantages And Disadvantages Of Electrostatically Charged Fogs

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Electrostatic forces
A charge on the particle affects the path of the particle around the droplet. A neutral charge is required to increase the collision efficiency.
Types of airborne dust capture systems
Finely atomized water sprays
These are normally used at transfer points where there are no excessive turbulence.
Table 2- Advantages and disadvantages of using the finely atomized water sprays
Advantages Disadvantages
Water requirement are low tight enclosures are needed for effective system operation
The material is not chemically contaminated Requires good droplet to particle size match for effective control
The system can be economical
Electrostatically charged fogs
Electrostatically charged fog uses charged water droplets to attract dust …show more content…

The capital costs are the costs of acquiring major control equipment, accessories, auxiliary equipment and field installation. Operating and Maintenance costs are direct expenses of labour, day to day operating and maintenance, waste disposal costs, and the cost of replacing parts. (Vinit Moody, 1988)
When acquiring new equipment, a cost benefit analysis has to be done and this requires the knowledge of the time value of money. All future investments and expenditures should be reduced to the present value to correctly compare them.
In the case of annual costs paid each year, they can also be translated to the present value. The following equations are frequently used:
FV=PV〖(1+i)〗^n
Equivalent annual costs are determined using the formula,
EAC=((PV*i))/((1-1/(1+i)^n ))

Where: FV= Future Value PV= Present

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