The Kinetics of Limestone/Dolomite with H₂S Under Rich Combustion Conditions

Abstract

The kinetics of the reaction of limestone/dolomite with H₂S have been examined under fuel rich combustion conditions. The experiments were done in a tubular laminar flow reactor with co-current flow of gas and solids.

In the temperature region, 1065-1310^°C, the results were consistent with the absorption reaction of H₂S first order with respect to calcium and half order with respect to H₂S. Reactivity of the stones fell off substantially between 1065-1310^°C because of severe desurfacing occurring at these temperatures to the limestone and dolomite. A diffusion controlled reaction is believed to be the dominant mechanism.