Optimizing heat transfer characteristics in dry centrifugal Granulation: Impact of particle population trajectory and cooling strategies

Efficient recovery of heat and utilize blast furnace slag resources are crucial for achieving energy savings and reducing consumption in the steel industry. This study focuses on applying dry centrifugal pelletizing technology for recovering waste heat from slag. A comprehensive two-dimensional model was developed to investigate heat transfer dynamics within particle clusters, considering the variable physical parameters of the slag, latent heat of the phase change, and slag particle characteristics. Through an extensive analysis of the heat exchange within the granulation bin, we examined the temperature variations of slag particles and the distribution of absorbed heat by the water-cooled and air. Findings underscore the significant influence of flight trajectory, residence time, air-inlet flow rate, and temperature on heat exchange efficiency. Additionally, we explored the impact of auxiliary cooling measures and investigated how slag particle characteristics affect the bin wall, highlighting their importance for safe operations. Our results provide valuable insights for enhancing waste heat recovery efficiency from blast furnace slag and optimizing the implementation of dry centrifugal granulation technology. It serves as a vital reference for promoting energy-saving initiatives and reducing consumption in the steel industry.