Major Components: Ductwork

Ductwork connects the precipitator with upstream and downstream equipment. The design of the ductwork takes into consideration the following:

  1. Low Resistance to Gas Flow “ Achieved by selecting a suitable cross-section for the ductwork and by installing gas flow control devices, such as turning valves and flow straighteners
  2. Gas Velocity Distribution “ Gas flow control devices are used to maintain good gas velocity distribution
  3. Minimal Fallout of Fly Ash “ Fallout can be minimized by using a suitable transport velocity
  4. Minimal Stratification of the Fly Ash “ A suitable transport velocity also reduces fly ash stratification in the gas stream
  5. Low Heat Loss “ The goal is to reduce the heat loss of the flue gas to a level that will prevent acid or moisture condensation in the downstream equipment, requiring the use of thermal insulation protected by external siding.
  6. Structural Integrity “ Ductwork structure supports its total load, including wind and snow loads. The design also allows for accumulated fly ash, negative/positive operating pressure, and gas temperature. Expansion joints are used to accommodate thermal growth.


Helpful Resources

KnowledgeBase: Gas Distrbution Systems

KnowledgeBase: Improve Flow Distribution

KnowledgeBase: Introduction to ESP

Our Capabilities: Emissions Compliance Planning & Management

Our Capabilities: Gas Flow & Fluid Dynamics Modeling

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Upgrading Precipitator Controls Quickly Improves Performance

Cheswick Controls Success Story

Neundorfer helped Reliant Energy's Cheswick station improve consistency and overall precipitator performance by installing upgraded controls and Precipitator Optimization System (POS) software. ...

Read the White Paper

"The Neundorfer upgrades provide us with better ways to monitor and evaluate precipitator performance."

Bill McGraw

Plant Engineer, Reliant Energy Cheswick Station

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