The effects of cofiring natural gas and coal on sulfur retention in ash

摘要: Abstract Under certain conditions, cofiring natural gas with coal has been shown to reduce SOx emissions beyond the reduction expected from simple replacement of sulfur-bearing coal. This enhanced sulfur emissions, known as leveraging, is believed result increased capture in ash. In this research, experiments three coals, using size ranges 90 106 μm and 125 150 μm, furnace temperatures 1300 1550 K, demonstrate extent leveraging through retention ash when gas. Leveraging be affected by residence time (through particle size) temperature, while original form (pyritic or organic) sorbent capacity are have little effect. Results activation studies, SEM images, N2 adsorption measurement total surface area indicate that effects a flame on reactivity minimal. also primary mechanism for phase conversion SO2 more reactive SO3, caused flame. numerical modeling environment, combustion, evolution SO3 support experimental findings.