Fuel-oil reburning application for NOx control to firetube package boilers (journal version)

Technical Report · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5125860

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% O/sub 2/) 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 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.

• Research Organization: Environmental Protection Agency, Research Triangle Park, NC (USA). Air and Energy Engineering Research Lab.
• OSTI ID: 5125860
• Report Number(s): PB-88-154422/XAB; EPA-600/J-87/159
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
424000* -- Engineering-- Pollution Control Equipment-- (1980-1989)
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION ABATEMENT
BOILERS
BURNERS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
DISPERSIONS
ELEMENTS
EVAPORATION
FUEL OILS
FUELS
LIQUID FUELS
MIXTURES
NITROGEN
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PETROLEUM PRODUCTS
PHASE TRANSFORMATIONS
POLLUTION ABATEMENT
REDUCTION
THERMOCHEMICAL PROCESSES