The Evolution of Pyritic and Organic Sulfur from Pulverized Coal Particles during Combustion

摘要

A detailed evaluation of the evolution of sulfur forms during the combustion of three pulverized coals illustrates that a more careful consideration of the behavior of included sulfur is necessary. Although this sample set is quite limited, the following approaches to the development of an initial model for the evolution of included pyritic and organic sulfur appear warranted for these specific coals: · The thermal decomposition of pyritic sulfur is coal specific and, under the reducing conditions within a coal particle, the amount of sulfur released has been observed to exceed that which would result from decomposition of pyrite to troilite (Fe{sub}1.0S). A predictive correlation will require a broader range of coals and further study. · Pyrolysis of organic sulfur appears to be similar to that of the remaining organic structure. · During char oxidation, total sulfur evolves at a rate similar to that of the remaining organic structure.