Oklahoma Gas & Electric Muskogee Generating Station Best ...

Oklahoma Gas & Electric
Muskogee Generating Station – BART Determination
May 28, 2008
3.1 Step 1: Identify Potentially Feasible NOx Control Options
Potentially available control options were identified based on a comprehensive review of available
information. NOx control technologies with potential application to Muskogee Units 4 & 5 are
listed in Table 3-1.
Table 3-1
List of Potential NOx Control Options
Combustion Controls
Control Technology
Low NOx Burners & Overfire Air (LNB/OFA)
Flue Gas Recirculation (FGR)
Post-Combustion Controls
Selective Noncatalytic Reduction (SNCR)
Selective Catalytic Reduction (SCR)
Innovative Control Technologies
Rotating Overfire Air (ROFA)
ROFA + SNCR (Rotamix)
Wet NOx Scrubbing
3.2 Step 2: Technical Feasibility of Potential Control Options
NOx control technologies can be divided into two general categories: combustion controls and postcombustion
controls. Combustion controls reduce the amount of NOx that is generated in the
boiler. Post-combustion controls remove NOx from the boiler exhaust gas. The technical feasibility
of each potentially applicable NOx control technology is evaluated below.
3.2.1 Combustion Controls
The rate of NOx formation in the combustion zone is a function of free oxygen, peak flame
temperature and residence time. Combustion techniques designed to minimize the formation of
NOx will minimize one or more of these variables. Combustion control options that may be
applicable to the OG&E boilers are described below.
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