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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Paper Mill Gains Operational Flexibility While Reducing Emissions

Paper Company: Optimizing Gas Flow Distribution

A paper company in Wisconsin was contemplating expensive precipitator modifications to reduce emission levels. Through modeling we discovered the same result could be achieved for much, much less by making relatively simple gas flow distribution chan ...

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"With Neundorfer's help, we were able to increase fuel ash content and boost precipitator ash carbon content without raising stack emissions."

Midwest Paper Mill

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