Electrostatic Precipitators

Since Dr. Frederick Cottrell's invention over a century ago, electrostatic precipitators (ESPs) have been a primary technology for controlling particulate emissions. ESPs can be designed to meet stringent particulate emission standards with minimal pressure loss and high equipment reliability for extended plant operation.

Operating Principle

  1. Particles suspended in a gas enter the precipitator and pass through ionized zones around the high voltage discharge electrodes. The electrodes, through a corona effect, emit negatively charged ions into the gas which travel to the grounded collecting plates.
  2. The ionized field around the discharge electrodes charges the particulate causing it to migrate to the grounded surface of the collecting plate.
  3. The charged particles agglomerate on the collecting plates where the charge bleeds off. Rappers dislodge the agglomerated particulate, which falls into the collection hoppers for removal.
Process for Electrostatic Precipitator

Design For Performance

From design to manufacturing and construction techniques, each HR-C Electrostatic Precipitator is engineered to meet the requirements of the project and provide long-term reliable service.

MIGI Rappers

For high efficiency performance, rapping losses comprise the bulk of particulate emissions. MIGI Rappers provide flexible control over rapping intensity and frequency allowing optimization of performance to minimize particulate emissions.

G-Opzel Collecting Plates

Hamon Research-Cottrell’s G-Opzel™ collecting plate incorporates our traditional Optimum Precipitation Zone Electrode design that provides quiescent zones to aid in particulate collection and to reduce re-entrainment during rapping.

The G-Opzel™ has been the collecting plate of choice for many new and upgraded ESPs and is used by some HR-C competitors. The G-Opzel™ Collecting Plate is manufactured by Hamon’s Thermal Transfer Corporation

Rigid Discharge Electrodes

Robust unbreakable rigid discharge electrodes were first introduced by Research-Cottrell in the 1970s. HR-C’s latest pipe & spike electrodes allow the discharge electrode electrical properties to be tailored to the specific requirements of each application.

Electrode Type Configuration Applications

Pipe & Spike
(center line)

Pipe & Spike - center line
Pipe & Spike - center line
  • Course particulate
  • High particulate concentration
  • Moderate level of corona suppression

Pipe & Spike

Pipe & Spike - tangential
Pipe & Spike - tangential
  • Fine particulate
  • High particulate concentration
  • Need to overcome corona suppression

Controls and Power Supplies

HR-C works with selected suppliers to provide advanced microprocessor controls and the latest in transformer/rectifiers and switch mode power supplies to maximize performance.