Bench-Scale Evaluation of Non-U.S. Coals for NOx Formation Under Excess Air and Staged Combustion Conditions

摘要

The report describes results of bench-scale fuel screening experiments. Twenty non-U.S. coals (including lignite, subbituminous, and bituminous) were tested in a 21 kWt refractory-lined tunnel furnace. NOx emissions were measured as a function of coal composition and initial fuel/air contacting rate under excess air conditions. In addition, in-flame measurements were made to quantify the influence of stoichiometry and temperature on the fate of fuel nitrogen species under staged combustion conditions.