Predicting the performanced of NO{sub x} reduction by gas reburning

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:171597

Li, B W; Moyeda, D; Payne, R ^[1]

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1. Energy and Environmental Research Corporation, Irvine, CA (United States)

The supplemental use of natural gas in a reburning mode has been developed as a retrofit technology for the control of NO{sub x} emissions from coal-fired utility boilers. The technique involves combustion staging, achieved through the injection of natural gas at an elevation above the main burner zone, followed by the subsequent use of overfire air to complete burnout. The fundamentals of the reburning process are well understood, and a large body of data exists concerning controlling parameters and their relative impacts on NO{sub x} reduction. In recent demonstrations of the technology on full-scale utility boilers, NO{sub x} reduction levels up to 70% have been achieve As a result of recent M-scale boiler demonstrations, much of the understanding gained at laboratory and pilot experimental scales has been verified, refined, and incorporated into various computational models. These models can be used to evaluate the performance achievable by the application of gas reburning to a specific coal-fired utility boiler, or to assess options for optimizing the performance of an installed system. This paper describes how computational tools were used to evaluate the reduction in NO{sub x} emissions from a 33 MW{sub e} cyclone-fired boiler retrofit with gas reburning. The two primary computer tools in this study were a two-dimensional furnace combustion and beat transfer code, and a one-dimensional chemical kinetics code equipped with a detailed hydrocarbon and nitrogen reaction mechanism The approach used to model the performance of the gas reburning system on the 33 MW{sub e} cyclone-fired boiler is described and the results of a sensitivity analysis of the various process parameters on the reburning system performance are discussed. The key parameters evaluated in this study included the operating stoichiometries of the cyclone furnace, reburning zone, and burnout zone and the reburning fuel jet mixing time.

• Research Organization: Coal and Slurry Technology Association, Washington, DC (United States); USDOE Pittsburgh Energy Technology Center, PA (United States)
• OSTI ID: 171597
• Report Number(s): CONF-950313--; ON: TI96120229
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
03 NATURAL GAS
AIR POLLUTION CONTROL
BOILERS
CHEMICAL REACTION KINETICS
COAL
COMBUSTION
FOSSIL-FUEL POWER PLANTS
HEAT TRANSFER
NATURAL GAS
NITROGEN OXIDES
PERFORMANCE
STOICHIOMETRY