Numerical predictions of burner performance during pulverized coal combustion

Conference · Thu Jul 01 04:00:00 EDT 1999

OSTI ID:20006874

Zarnescu, V; Pisupati, S V

The performance of four burners in terms of temperature and velocity profiles, residence time and NO{sub x} emissions was predicted using numerical simulations and a two-dimensional model for pulverized coal combustion. Numerical predictions for two burners used in a pilot-scale 0.5 MM Btu/hr (146.5 kW) down-fired combustor (DFC) are presented. Two other burner configurations were evaluated and compared with the ones used with the DFC for attaining lower NO{sub x} levels. Simulations were conducted for both coal and coal-water slurry as primary fuels. A sensitivity analysis of predictions with respect to variations of the model parameters was performed. The results suggest that the higher NO{sub x} reduction with one of the burners used in the DFC is due to the improved near-burner aerodynamics and to better flame attachment. These improved conditions are influenced by a combination of geometric and flow parameters, such as burner dimensions, quart diameter, inlet velocity, inlet temperature and swirl number.

• Research Organization: Pennsylvania State Univ., University Park, PA (US)
• Sponsoring Organization: US Department of Energy
• DOE Contract Number: FC22-92PC92162
• OSTI ID: 20006874
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
AIR POLLUTION ABATEMENT
BURNERS
COAL
FUEL SLURRIES
MATHEMATICAL MODELS
NITROGEN OXIDES
PERFORMANCE
PULVERIZED FUELS
SENSITIVITY ANALYSIS
WATER