Fuel-oil reburning: application for NOx control to firetube package boilers

Technical Report · Tue Oct 01 04:00:00 EDT 1985

OSTI ID:6120055

Mulholland, J A; Hall, R E

The paper discusses retrofitting two 1.0 MW (3.5 million Btu/hr) firetube package boilers for fuel-oil-reburning application for NOx emission control. An overall NOx reduction of 46% from an uncontrolled emission of 125 ppm (dry, at 0% O2) was realized by diverting 20% of the total boiler load to a distillate-fuel-oil-fired second-stage burner; a 51% NOx reduction from 265 ppm was achieved in a distillate/residual fuel-oil mixture (0.14% nitrogen content) reburning application. Nitrogen-free fuel oil reburning was found to be slightly more effective at reducing NOx than natural gas reburning, although longer fuel-rich zone residence times were required to allow for evaporation and mixing of the fuel oil droplets. The key parameters investigated, that impact the reburning process, were: primary flame NOx, reburn zone stoichiometry, and reburn zone residence time. Reburning applied to firetube package boilers requires minimal facility modification.

• Research Organization: Environmental Protection Agency, Research Triangle Park, NC (USA). Air and Energy Engineering Research Lab.
• OSTI ID: 6120055
• Report Number(s): PB-86-118825/XAB
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
421000* -- Engineering-- Combustion Systems
AIR POLLUTION ABATEMENT
BOILERS
BURNERS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
COMBUSTION PRODUCTS
FUEL OILS
FUELS
FUNCTIONAL MODELS
INDUSTRIAL WASTES
KINETICS
LIQUID FUELS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PETROLEUM PRODUCTS
PILOT PLANTS
POLLUTION ABATEMENT
REACTION KINETICS
THERMOCHEMICAL PROCESSES
WASTES