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NOx Reduction of a 165 MW Wall-Fired Boiler Utilizing Air and Fuel Flow Measurement and Control

[+] Author Affiliations
Marion Cherry

Santee Cooper, Moncks Corner, SC

Dave Earley

Combustion Technologies Corporation, Raleigh, NC

David Silzle

Air Monitor Corporation, Santa Rosa, CA

Paper No. IJPGC2002-26131, pp. 743-759; 17 pages
doi:10.1115/IJPGC2002-26131
From:
  • 2002 International Joint Power Generation Conference
  • 2002 International Joint Power Generation Conference
  • Scottsdale, Arizona, USA, June 24–26, 2002
  • Conference Sponsors: Power Division
  • ISBN: 0-7918-3617-7 | eISBN: 0-7918-3601-0
  • Copyright © 2002 by ASME

abstract

As a result of increasingly stringent emissions limitations being imposed on coal-fired power plants today, electric utilities are faced with having to make major compliance related modifications to their existing power plants. While many utilities have elected to implement expensive post-combustion NOx reduction programs on their largest generating units, infurnace NOx reduction offers a less expensive alternative suitable to any size boiler, to reduce NOx while also improving overall combustion. In-furnace NOx reduction strategies have proven that, when used with other less expensive approaches (Overfire air, fuel switching, and/or SNCR), levels less than 0.15 lb./MMBtu can be economically achieved. Furthermore, when implemented in conjunction with an expensive post-combustion SCR program, initial capital requirements and ongoing operating costs can be cut to save utilities millions of dollars. For the purpose of developing a system-wide NOx reduction strategy, Santee Cooper, a southeastern U.S. utility applied pulverized coal flow and individual burner airflow measurement systems to Unit 3 at its Jefferies Station, a 165MW, 16-burner front wall-fired boiler. The airflow measurement system, in service for many years, applied a well-proven averaging Pitot tube technology to measure individual burner secondary airflow. The coal flow measurement system utilized low energy microwaves to accurately measure coal density and coal velocity in individual coal pipes. The combination of these two systems provided the accurate measurements necessary for controlled manipulation of individual burner stoichiometries, giving the plant the ability to improve burner combustion, yielding a reduction in NOx levels approaching 20%. Optimized burner combustion also resulted in a leveling of the excess O2 profile, which will enable the plant to pursue further reductions in excess air as well as staged combustion, thus allowing for further NOx reductions in the future. How this program produced a significant NOx reduction will be presented in detail in this paper. The paper will also discuss the effects on excess O2 , opacity, and unburned carbon. In addition, this program will allow for future system-wide planning with regard to possible SCR implementation.

Copyright © 2002 by ASME

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