Effect of Fuel Sulfur on Nitrogen Oxide Formation in Combustion Processes

摘要

The report gives results of research that focuses on the questions: is the sulfur content of a fuel likely to have a major influence on the resulting NOx emissions; and does the presence of fuel sulfur cause major changes in mechanisms of fuel NO formation. Research results will aid in the interpretation of data on effects of fuel quality and composition on pollutant formation and will help in the development of combustion modifications for pollutant control from burning dirty fuels. The most important conclusion is that the presence of fuel sulfur will increase the ultimate conversion of fuel nitrogen to NOx under poorly mixed flame conditions that are often typical of combustion modifications. The influence of sulfur is to increase the total amount of XN species (NO + NH3 + HCN) under rich conditions, and this effect is most pronounced at high temperatures. The mechanisms occur in the post-flame or at fairly long residence times and probably involve interactions between the hydrocarbon chemistry, sulfur, and nitrogenous species.