Parameters influencing nitrogenous species formation and reaction in stoker coal-fired combustion

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1982

OSTI ID:6172108

Starley, G P

The purpose of this investigation was to characterize the influence of combustion parameters on NO formation mechanisms in the fuel-bed burning regimes of spreader and mass-burning stokers. The approach utilized an experimental fixed-bed furnace configured to provide specific simulations of either stoker system. In the spreader-stoker configuration, large coal particles were fired in a continuous simulation of bed-phase combustion. In the mass-burning stoker configuration, the coal bed was fired in a transient mode to simulate the time/temperature/environmental history of a small segment of a thick fuel bed. First-stage stoichiometry was the primary combustion parameter influencing NO formation in both stoker simulations. Substantial reductions in exhuast NO emissions were achieved under staged combustion conditions. Under fuel-rich conditions, fuel nitrogen speciation favored the formation of reduced intermediates (NH/sub 3/ and HCN). Second-stage conversion of fixed nitrogen species was found to be inversely proportional to concentration and dependent on rich-zone residence time and local stoichiometry. For both stoker simulations, an increase in fuel burning rate resulted in increased NO emissions.

• OSTI ID: 6172108
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000 -- Coal
Lignite
& Peat-- Combustion
42 ENGINEERING
421000* -- Engineering-- Combustion Systems
BOILERS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTION PRODUCTS
ENERGY SOURCES
FOSSIL FUELS
FUEL FEEDING SYSTEMS
FUEL SYSTEMS
FUELS
MATERIALS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
STOICHIOMETRY
STOKERS
THERMOCHEMICAL PROCESSES
YIELDS