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Electrostatic
precipitators  Elements of design










Disclaimer: This
calculator is only a tool of approach and should not replace the study of a
specialized firm or competent people!











A particular attention
should be paid on the units.















Date








Company/Plant




Installation












Is there a
representative particle size analysis of the dust?




Yes








No


Typical feed of the ESP

Dimension in µ
(*) by ascending order

Cumulated
residues in % (*)

Average dimension
of the range in µ

Partial residues
in % (*)




















































(*) all fields must be completed








(*) ascending sieves
















Mean particle size (*)


µ






(*) according to the mass








If there is no particle size analysis:






Define a mean particle size (*)


µ






(*) only if there is no size analysis








Particles Density


kg/m3






Dust concentration


g/m3














Gas temperature


°C






Pressure to consider


kPa


atm




Specific gravity of gas


kg/m3














Estimate the velocity of
migration of the mean particle















Specify the electrical charge


C






Electric field strength


V/m














Dynamic viscosity of air


Kg/m.sec (N.sec/m2)













Migration velocity (ω)


cm/sec














Estimate the corona onset voltage














Discharge electrodes diameter


mm






Between collecting plates


mm (distance)













Corona onset voltage


V














Determine the specific collecting area (SCA)














Quantity of gas to be treated


m3/h






Define the desired efficiency


%






Specific collecting surface (*)


m2/(m3/s)






(*) the specific collecting area (SCA) is between
16 and 150 m2/(m3/s)





(*) one must modify, if necessary, the value of
electric charge to stay in this range













Estimate the dimensions of the ESP














Total Collecting surface


m2














Aspect ratio (L/H) (*)








(*) ratio Length/Height between 0,5 et 2








Estimate a gas velocity (*)


m/s






(*) normally between 1 and 2,5 m/s








Dimensions (*)
















Plate height


m






Plate length


m






Number of plates required








Width of the ESP


m






(*) select the aspect
ratio and the gas velocity ratio to get a satisfactory appearance














Calculation of the efficiency the ESP














By the formula of Deutsch


%






By revised formula


%






Outlet load


g/m3 (dust concentration
at outlet)












Estimate the power required
















Pressure drop of ESP (*)


mmH2O


kPa




(*) value expected








Other pressure drops in the circuit to take into
consideration:





At mill outlet


mmH2O


kPa




Of static separator


mmH2O


kPa




Of Cyclone


mmH2O


kPa




Dynamic pressure


mmH2O


kPa




Ducts


mmH2O


kPa




Total pressure drop


mmH2O


kPa












Fan efficiency


%






Operating Power


kW


ch












Power for the corona effect


kW


ch












Total power


kW


ch











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All rights reserved © 20122015 The Cement Grinding Office
