Investigating Electrostatic Precipitator Design Parameters for Efficient Control of Particulate Matter in Thermal Power Plant: A Case Study

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Abstract

This work deals with the analysis and modification of operational parameters for meeting the emission standards, set by Central Pollution Control Board (CPCB)/State Pollution Control Board (SPCB) from time to time of electrostatic precipitator (ESP). The analysis is carried out by using standard chemical analysis supplemented by the relevant data collected from Korba East Phase (Ph)-III thermal power plant, under Chhattisgarh State Electricity Board (CSEB) operating at Korba, Chhattisgarh. Chemical analysis is used to predict the emission level for different parameters of ESP. The results reveal that for a constant outlet PM concentration and fly ash percentage, the total collection area decreases with the increase in migration velocity. For constant migration velocity and outlet PM concentration, the total collection area increases with the increase in the fly ash percent. For constant migration velocity and outlet e PM concentration, the total collection area increases with the ash content in the coal. i.e. from minimum ash to maximum ash. As far as the efficiency is concerned, it increases with the fly ash percent, ash content and the inlet dust concentration but decreases with the outlet PM concentration at constant migration velocity, fly ash and ash content.

Keywords

Bag-filter Coal Electrostatic precipitator  Migration velocity Outlet PM concentration 

List of Symbols

a

Total collection area of plates (m2)

A

Percentage of ash in coal sample

A/F

Air–fuel ratio

\(\left( {A/F} \right)_{th,m,d}\)

Air–fuel ratio, ‘th’ for theoretical, ‘m’ for gravimetric (mass), ‘d’ for dry

C

Percentage of carbon in coal sample

EA

Excess air (105%)

FA

Fly ash (taking as 80, 85, and 90%)

H

Percentage of hydrogen in coal sample

mair

Mass of air

m2

Outlet dust concentration (gm/Nm3) restricted by CPCB

M

Percentage of moisture in coal sample

O

Percentage of oxygen in coal sample

P1

Pressure of air at design condition of ESP

Q

Volume flow rate of gas stream (m3/s)

S

Percentage of sulfur in coal sample

T1

Temperature of air at design condition of ESP

V1

Volume of air at design condition of ESP

w

Migration velocity (m/s)

ρair

Density of air at 141 °C (design condition temperature of ESP) is 2.556 kg/m3

Notes

Acknowledgements

This research work was supported by Chhattisgarh Council of Science and Technology (CCOST), Raipur (C.G.), India through a Grant (284/CCOST/MRP/2012). The authors wish to thank Dr. Avinash Chandra, former Professor and Head, Centre for Energy Studies, I.I.T. Delhi, India for posing insightful email discussions. Funding was provided by CCOST Raipur (Grant No. 2328/CCOST/2015).

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Copyright information

© The Institution of Engineers (India) 2018

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringVishwavidyalaya Engineering College, LakhanpurAmbikapurIndia

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