Reburning for utility boiler NO{sub x} control: A comparison of theory and practice

Book · Tue Dec 31 04:00:00 EST 1996

OSTI ID:427836

Ashworth, B; Sommer, T ^[1]; Moyeda, D; Payne, R ^[2]

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1. Energy and Environmental Research Corp., Orrville, OH (United States)
2. Energy and Environmental Research Corp., Irvine, CA (United States)

A design methodology for application of reburning NO{sub x} control technology to electric utility boilers has been developed. The methodology is based upon extensive pilot-scale testing performed to characterize the influence of process parameters on the effectiveness of the reburning process, and permits prediction of the site specific impacts of reburning on boiler NO{sub x} emissions and performance. In the use of the design methodology for a specific site, a thorough review of boiler physical and operating data is initially performed to develop an approach for implementing reburning on the unit which takes into account the requirements of the process for optimum effectiveness and site specific constraints. Physical models are then used to assess the furnace flow field and to develop optimum designs for the equipment arrangement. Computer modeling is used in the design process to assess the impacts of reburning on boiler thermal performance and NO{sub x} emission reduction. In three electric utility retrofits completed to date, reburning has been applied to boilers with very different capacities and firing arrangements: a 71 MW{sub e} tangentially fired unit, a 33 MW{sub e} cyclone-fired unit, and a 172 MW{sub e} wall-fired unit. The results of these retrofits have largely validated the design methodology and provide insight into the impacts of reburning on NO{sub x} emissions and boiler performance. This paper summarizes the results of these studied and provides a comparison between the modelling work and the actual field performance.

• OSTI ID: 427836
• Report Number(s): CONF-961006--; ISBN 0-7918-1795-4
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
AIR POLLUTION CONTROL
DIAGRAMS
EXPERIMENTAL DATA
FOSSIL-FUEL POWER PLANTS
NITROGEN OXIDES
RETROFITTING
STAGED COMBUSTION