Effects of design and operating variables on NO/sub x/ from coal-fired furnaces. Phase II. Final report

Technical Report · Sat Feb 01 04:00:00 EST 1975

OSTI ID:7295357

Armento, W J

Results are presented of an investigation of combustion modification techniques for controlling NOx emissions that have application to pulverized coal-fired utility boilers. The techniques, studied on a 5 million Btu/hr single-burner pilot unit, included: excess air, air preheat, firing rate, flue gas recirculation, staged, combustion, quench, and swirl. Tests conducted with a Colorado coal showed that NOx reduction of up to 65 percent was possible by using staged combustion or by lowering excess air levels from 30 to zero percent. Flue gas recirculation yielded only moderate NOx reductions for coal. For existing units, control of excess air appears to be the simplest method for NOx reduction. Where possible, staged combustion could be retrofitted on existing units to achieve further NOx reductions. For new units, staged combustion combined with low excess air firing appears to be the most promising method for NOx control. (GRA)

• Research Organization: Babcock and Wilcox Co., Lynchburg, Va. (USA). Research and Development Div.
• OSTI ID: 7295357
• Report Number(s): PB-241283
• Country of Publication: United States
• Language: English

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54 ENVIRONMENTAL SCIENCES
BOILERS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL EFFLUENTS
CHEMICAL REACTIONS
COAL
COMBUSTION
CONTROL
DENITRIFICATION
ENERGY SOURCES
FLUE GAS
FLUID FLOW
FOSSIL FUELS
FUELS
GAS FLOW
GASEOUS WASTES
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
STOICHIOMETRY
WASTES