The influence of burner injection mode on pulverized coal and biomass co-fired flames

Conference · Wed Nov 30 23:00:00 EST 1994 · Combustion and Flame; (United States)

OSTI ID:6574886

Abbas, T; Costen, P; Kandamby, N H; Lockwood, F C; Ou, J J ^[1]

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1. Imperial College of Science, Technology and Medicine, London (United Kingdom). Dept. of Mechanical Engineering

A new dual fuel burner designed for the co-firing of waste-derived solid fuels (e.g., biomass, refuse-derived fuel, sewage sludge) with pulverized coal in practical combustors was evaluated through trials undertaken in a 0.5 MW down-fired furnace. A new mathematical procedure was also constructed that accounts for multimode combustion of these fuels. Results included for sawdust-coal flames, show the significant effect of co-firing ratio and fuel injection mode on flame ignition, combustion aerodynamics, and nitric oxide emissions. Predicted indices of the coal devolatilization rate along the particle trajectories emphasize the influence of the faster devolatilization and ignition of the sawdust on coal combustion in the near burner region. When the sawdust particles are injected through the center of the burner, surrounded by the annular coal jet, they immediately ignite thereby enhancing the combustion intensity of the coal within the internal recirculation zone. This injection mode leads to a subsequent reduction in the nitric oxide formation along with a higher combustion efficiency as compared with a flame where the sawdust and coal injection positions are reversed. An optimum co-firing ratio which the sawdust provided 30% of the total heat input was obtained for a lower reactivity and higher nitrogen content fuel (pulverized sewage sludge) as compared with sawdust, show that the fuel injection mode had a marginal effect on burnout and NO emissions. The sawdust and sewage sludge co-firing results emphasize the need to consider both the reactivity and nitrogen content of the fuel prior to selecting an injection mode.

• OSTI ID: 6574886
• Report Number(s): CONF-940711--
• Journal Information: Combustion and Flame; (United States), Journal Name: Combustion and Flame; (United States) Vol. 99:3-4; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
014000* -- Coal
Lignite
& Peat-- Combustion
09 BIOMASS FUELS
092000 -- Biomass Fuels-- Combustion-- (1990-)
AIR POLLUTION ABATEMENT
BIOLOGICAL MATERIALS
BIOLOGICAL WASTES
BURNERS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COCOMBUSTION
COMBUSTION
COMBUSTION KINETICS
DESIGN
ENERGY SOURCES
FOSSIL FUELS
FUEL FEEDING SYSTEMS
FUEL SYSTEMS
FUELS
KINETICS
MATERIALS
MATHEMATICAL MODELS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
POLLUTION ABATEMENT
REACTION KINETICS
SEWAGE
SEWAGE SLUDGE
SLUDGES
SOLID WASTES
TESTING
THERMOCHEMICAL PROCESSES
WASTES
WOOD WASTES