Carbon-contained cement “raw” meal pellets’ preheating and decomposition

Abstract

This study was conducted for carbon-contained cement raw meal pellets from an actual production facility, and on heat transfer, particle cracking and the reaction process of the material balls under high temperatures. Reasonable process parameters and significant conclusions were obtained. The results suggested that (1) the residence time of materials in the preheating process should be controlled within approximately 300 s; (2) the preheating exhaust gas temperature should be controlled at 600°C, which should be conducive to reducing a large number of broken pellets; (3) higher temperatures, smaller particle sizes and greater gas velocity were helpful to a higher weight-loss ratio and an overall reaction rate; (4) pulverized coal combustion took longer time than limestone decomposition above 900°C.