This project includes fundamental research and engineering development of low NOx burners and reburning fuel injectors. The team of Reaction Engineering International (REI), the University of Utah, Brown University and DB Riley, Inc., will develop fundamental information on low NOx burners. The work has two phases. In the first phase, the University of Utah will examine two-phase mixing and near-field behavior of coal injectors using a 15-million Btu/hr bench-scale furnace, Brown University will examine char deactivation and effectiveness of reburning, and REI will develop a comprehensive burner model using the data produced by the University of Utah and Brown University. In the second phase, an optimized injector design will be tested at the 100-million Btu/hr Riley Coal Burner Test Facility. It is anticipated that this work will provide improved hardware designs and computer simulation models for reduced NOx emissions and minimized carbon loss.