Kinetics analysis of sulfur gasification during clinker production in cement kiln

During clinkering, the release of volatile sulfur elements poses a threat to the surrounding atmosphere and environment. Thus, it becomes imperative to investigate the gasification process of sulfur elements during the collaborative disposal of cement kilns. Thermogravimetric analysis was employed to determine the main gasification reaction temperature range, followed by kinetic and thermodynamic analysis. The results revealed that using Friedman, Flynn–Wall–Ozawa (FWO), Kissinger–Akahira–Sunose (KAS) and Starink, the average activation energies of sulfur gasification reaction were determined to be 226.56, 270.54, 259.90 and 260.58 KJ/mol, respectively. The KAS model exhibited a favourable fit with the experimental results, enabling the estimation of the pre-exponential factor. In terms of thermodynamic properties, the gasification reaction displayed positive ΔH and ΔG values, indicating it is highly endothermic and non-spontaneous. From a reaction function perspective, sulfur gasification is predominantly influenced by diffusion. The established mathematical prediction model of the sulfur gasification ratio demonstrated minimal deviation from the experimentally measured value. The thermodynamic and kinetic parameters presented in this study provide a theoretical foundation for the precise control and capture of harmful sulfur elements during clinkering.