An ESP is a particulate collection device that removes particles from a flowing gas using the force of an induced electrostatic charge.
The Electrostatic Precipitators  comes in two variants:
  • Dry ESP: used on hot process exhaust (50 – 450˚C) that operate above the dew point of gas stream.
  • Wet ESP: used for special applications that require filtering wet, sticky, tarry and oily particulate matter.
  • Cement & Rock Products
  • Power Plants
  • Pulp & Paper
  • Steel
  • Chemicals
  • Sinter Plants
  • Textiles
  • Pelletization Plants
  • Foods & Beverages
  • Horizontal and Vertical Flow Precipitators
  • Dry type design for Gas volumes 5000 Am3/hr to 3000000 Am3/hr
  • Wet type design for maximum particulate removal
  • Hot gas designs for operation at temperatures above 450°C
  • Expertise of top as well as bottom rapping
  • Diverse applications like corrosive gas, Over 100 types of dusts, tar, etc
  • ESPs are constant efficiency devices. When the inlet dust load even slightly increases, the outlet emissions may increase.
  • High Foot-print area
  • ESPs have comparatively higher capital investments
Factors considered for selection of ESP:
  • Gas flow – (m3/hr)
  • Gas temperature – (Deg C)
  • Inlet dust concentration – (gms/m3)
  • Required outlet emission – (mg/m3)
  • Required collection efficiency – %
  • Moisture in gas – %
  • Dust composition with components like K2O % and SiO2% in ash – %
  • Sulphur content in fuel – %
  • Particle size distribution
Various measures that can be undertaken while retrofitting the existing ESP to enhance capacity & lower the outlet emissions:
  • Addition of fields for capacity up-gradation / emission reduction.
  • Assessment and refurbishment of the ESP system,  refurbishment of damaged field internals&modifications and improvements therein.
  • Rebuild configuration with higher collecting area and fields.
  • Arrangement utilizing the existing space-to achieve higher collection efficiency.
  • Replacement of bottom rapped design with top rapped configurations or improved in-kind type design.
  • Splitting of the ESP fields, sectionalisation and addition of new T/R set(s).
  • Supply of discharge electrodes to replace existing electrodes of the ESP (any make, any design).
  • Relocation and rebuild of the existing ESP.
  • New PLC based rapper control panel to replace the older microprocessor based panel.
  • Capacity up-gradation – Turnkey Project solutions covering replacement of existing ESP (any make, any design), series or parallel ESP constructions etc.

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