Neutralization of Sulfur-Containing Gases During Coal Filtration Combustion

The neutralization of sulfur compounds during the filtration combustion of model mixture compositions containing iron sulfide or copper sulfate by adding marble (CaCO₃) is studied. It has been experimentally shown that during burning model charge compositions with additions of both iron sulfide and copper sulfate, replacing chemically inert sapphire with marble leads to a decrease in the combustion temperature by approximately 150–200°C. At the same time, the content of CO₂ in gaseous products increases, and the concentrations of CO and H₂ decrease. The greatest effect on the absorption of sulfur-containing substances when adding marble is shown in experiments where sulfur is present in the fuel in sulfide form: the addition of 50% marble makes it possible to capture 72% of the initial sulfur content, and for compositions with 90% marble in the charge, 85%. The absorption of the sulfur compounds formed during the combustion of model mixture compositions with copper sulfate is much worse. When the charge contains 50 and 85% marble, sulfur-containing compounds were absorbed by only 19 and 24%, respectively.