Fuel oil reburning application for NO/sub x/ control to firetube package boilers

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5599072

Mulholland, J A; Hall, R E

Two pilot-scale (0.73 MW or 2.5 x 10/sup 6/ Btu/hr) firetube package boilers were retrofitted for fuel oil reburning application for NO/sub x/ emission control. When firing distillate fuel oil (0.01 percent nitrogen content), an overall NO/sub x/ reduction of 46 percent from an uncontrolled emission of 125 ppm (dry, at zero percent U/sub 2/) was realized by diverting 20 percent of the total boiler load to a second stage burner; a 51 percent NO/sub x/ reduction from 265 ppm was achieved in a distillate/residual fuel oil mixture (0.14 percent nitrogen content) reburning application. Nitrogen-free fuel oil reburning was found to be slightly more effective at reducing NO/sub x/ than was natural gas reburning, though longer fuel-rich zone residence times were required to allow for evaporation and mixing of the fuel oil droplets. Key parameters investigated which impact the reburning process were: primary flame NO/sub x/, reburn zone stoichiometry, and reburn zone residence time. Reburning applied to firetube package boilers requires minimal facility modification. Reburning can be coupled with other NO/sub x/ control techniques (e.g., distributed air low NO/sub x/ burners) to achieve NO/sub x/ emissions of less than 100 ppm. However, for very low primary flame NO/sub x/ conditions (i.e., less than 200 ppm), reburning fuel nitrogen content is a limiting factor, and reburning with a low nitrogen content fuel, such as natural gas or nitrogen-free distillate oil, may be necessary to achieve 50 percent NO/sub x/ reduction.

• OSTI ID: 5599072
• Report Number(s): CONF-851005-
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
025000* -- Petroleum-- Combustion
20 FOSSIL-FUELED POWER PLANTS
200104 -- Fossil-Fueled Power Plants-- Components
200202 -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSTRACTS
AIR POLLUTION ABATEMENT
BOILERS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
DOCUMENT TYPES
DROPLETS
ENERGY SOURCES
EVAPORATION
FLAME PROPAGATION
FLUE GAS
FLUIDS
FOSSIL FUELS
FOSSIL-FUEL POWER PLANTS
FUEL GAS
FUEL OILS
FUELS
GAS FUELS
GASEOUS WASTES
GASES
LEADING ABSTRACT
LIQUID FUELS
MEETINGS
MIXING
NATURAL GAS
NITROGEN COMPOUNDS
NITROGEN OXIDES
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PARTICLES
PETROLEUM PRODUCTS
PHASE TRANSFORMATIONS
POLLUTION ABATEMENT
POWER PLANTS
RETROFITTING
STAGED COMBUSTION
STOICHIOMETRY
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE
WASTES