September 27, 2007

 

Upgrade or Replace your ID Fan? Answers in Hot Topic Hour

 

On September 7 there were hundreds of years of fan experience represented in the presenters and participants in a Hot Topic Hour on booster fans. Existing plants face big challenges when they add scrubbers with 20” w.g. pressure drop and SCR systems with 6” w.g. How do they deal with this increased resistance?

 

Jim Greenzweig of FlaktWoods summarized the options as follows:

 

 

 

 

 

 

 

 

§         Expected load model for the Unit (Base Loaded or Variable)

§         Importance of First Cost vs. efficiency

§         Comfort level with various technology (i.e.: VFD, Axial Fans, etc…)

§         Expectations for future spare parts and maintenance expenditures

§         Personal preference of those doing the evaluation

 

David Marshall of Howden Variax was on a trip to South America but still managed to connect and provide insights on axial fans for this application. More than 70 percent of the Variax installations are either booster or ID fans. Six hundred and twenty-four have been sold to Chinese power plants and 450 to utilities in the U.S. Germany has been the third largest market with 285 fans.

 

The decision on whether to choose axial or centrifugal depends on pressure and volume. In general, axial is more competitive when you exceed one million cfm. A two stage axial fan can develop 35” w.g. in each stage, but centrifugal fans can be designed for higher pressures.

  

The power point presentations are in the FGD Decision Tree. You can view them through the following links.

 

Jim Greenzweig - FlaktWoods

Start

Scrub

Physical

Component Specification

Fans

Sources

FlaktWoods

Products

Continuing Decision Process For: Products

Custom Designed Fans

http://www.mcilvainecompany.com/FGD_Decision_Tree/subscriber/Tree/DescriptionTextLinks/FlaktWoods Hot Topic Hour Sept. 27.htm
 

 

David Marshall - Howden

Start

Scrub

Physical

Component Specification

Fans

Sources

Howden

Products

Continuing Decision Process For: Products


Booster Fan Design and Materials

http://www.mcilvainecompany.com/FGD_Decision_Tree/subscriber/Tree/DescriptionTextLinks/David Marshall, Howden Variax - Booster Fan Design and Materials - September 27, 2007 Hot Topic Hour.htm