Title:  Catalyst Selection for Coal-fired Power Plants - Hot Topic October 21, 2010

   Application Sequencing

Company

Person

Product

Subject

Text Descriptor

·         W. S. Hinton & Associates

·         CoaLogix

·         Hitachi Power Systems America

·         Cormetech

·         Hinton, Scott W.

·         Mattes, Michael

·         Guglielmo, Stephen

·         Pritchard, Scot

·         Catalyst

·         Catalyst

·         Cleaning

·         Hydraulic Diameter

·         Regeneration

·         Rejuvenation

·         Webinar Recording

Experts representing consulting, catalyst, regeneration, and systems companies provided an in-depth analysis of the latest trends in catalyst use in coal-fired power plants. The dominant theme was that the SCR is no longer just a NO_x removal device but is a multi-pollutant control device. Various alternatives for increasing performance and decreasing cost were proposed. Some involved maintenance of the existing catalyst while others emphasized better designs which last longer without maintenance and can thereby minimize or eliminate the maintenance. There was also discussion on how the various designs compare. The claim was made that hydraulic diameter was a better measure than pitch. There was agreement that it would be desirable to define various terms relative to maintenance of catalysts. The consensus seemed to be as follows:

CATALYST

Management

  1. Maintenance

      a. Cleaning

      b. Rejuvenation

      c. Regeneration

  2. Replacement

Cleaning Catalyst: a dry process such as vacuum or mechanical removal of accumulations

Rejuvenation Catalyst: wet chemical removal of accumulations

Regeneration Catalyst: wet chemical removal plus re-impregnation of catalytic compounds

Physical characteristics

  1. Geometry

      a. Catalyst shape

          1. Honeycomb

          2. Corrugated

          3. Plate

       b. Openings

          1. Pitch

          2. Hydraulic diameter

Hydraulic diameter: The hydraulic diameter, DH, is a commonly used term when handling flow in noncircular tubes and channels. Using this term one can calculate many things in the same way as for a round tube. Definition: DH =4A P where A is the cross sectional area and P is the wetted perimeter of the cross-section. Reference http://en.wikipedia.org/wiki/Hydraulic_diameter

McIlvaine solicits the input from subscribers as to the appropriate nature of this classification.

Additional Webinar Recording Information
 

Title:  Catalyst Selection

   Application Sequencing

Company

Person

Product

Subject

Text Descriptor

·         Cormetech

·         Pritchard, Scot

·         Catalyst

·             Catalyst Management

·         Presentation

       
New SDA catalyst incorporates NH₃ oxidation functionality without increasing SO₂ oxidation. New arrangement with CoaLogix provides complete catalyst management service with integrated performance solutions and warranties.

Additional Presentation Information
 

Title:  Catalyst Selection and Regeneration Considerations

   Application Sequencing

Company

Person

Product

Subject

Text Descriptor

·         CoaLogix

·         Mattes, Michael

·    Catalyst Regeneration

· Catalyst Management

·         Presentation

       
Pluggage reduces performance and makes it difficult to accurately predict efficiency. All three catalyst designs can be regenerated to perform as new catalyst. A power plant should select catalyst with the proper pitch and erosion resistance and with the potential to meet outage and environmental requirements.

Additional Presentation Information
 

Title:  Catalysts to Meet More Stringent Regulations

   Application Sequencing

Company

Person

Product

Subject

Text Descriptor

·         Hitachi Power Systems America

·         Guglielmo, Stephen

·         Catalyst

·         Regeneration

·         Presentation

       
Hitachi continues to develop new catalysts that enhance the performance of the SCR with low cost solutions, minimize the operational impact to the unit, and provide the flexibility required. Offering the SCR system with the scrubber allows the company to make system guarantees on mercury control.

Additional Presentation Information
 

 Title:  SCR System Design, Operation and Catalyst Selection

   Application Sequencing

Company

Person

Product

Subject

Text Descriptor

·         W. S. Hinton & Associates

·         Hinton, Scott W.

·         Catalyst

·         Specification

·         Presentation

       
Advances in catalyst design will help address various pollution control issues but will also increase the number of parameters which must be evaluated during catalyst specification and selection. Plants are switching to high sulfur coals thus increasing SO₃. Mercury control requires new catalyst design. The catalyst regeneration option offers potential cost savings but adds another performance variable.

Additional Presentation Information