Combustion Modeling of Coal-Fired, Aerodynamically Air-Staged Burners

摘要

Tighter federal regulations on boiler emissions have led boiler manufactures to explore new designs and techniques to meet legislative requirements. Babcock & Wilcox is leading a Department of Energy-sponsored team in the development of an advanced coal-fired low emissions boiler system. To meet the goals of that program, a coal-fired low NO{sub}X burner is being developed. Numerical modeling and combustion tests at several scales are being used in conjunction to design and scale-up the burner. This paper presents model predictions for two candidate low-NO{sub}x burners and model comparisons with data: major species concentrations, NO{sub}X, and gas temperature. A scale model of a commercial dual-zone burner and the experimental MIT RSFC burner for staged and unstaged conditions are modeled for test conditions in the MIT Combustion Research Facility (CRF). The model predicts measured trends for temperature, major species, and the values of exit NO{sub}X, for the pilot-scale tests. These comparisons have been used to validate the model and establish a range of applicability. Future work on B&W's 100MKB (30 MW{sub}th) CEDF facility will include additional detailed measurements of velocity, species, and temperature. Data comparisons at this scale will be used to further extend the model's range of applicability for advanced burner design and scale-up.