Numerical simulation and validation of quasi steady state method for dual sizes calcination in a parallel flow regenerative lime kiln

As an essential slagging raw material in blast furnace iron making, quicklime, which requires high chemical activity, is produced in parallel flow regenerative(PFR)lime kilns. The PFR lime kiln supports a wide range of fuels and can calcine a wide range of particle sizes while maintaining a high reactivity, which enhances the high temperature hard-burnt issue caused by rotary kilns. In this study, the bed porosity under dual sizes structure has been obtained with the help of Discrete Element Model (DEM) based on Porous Medium Model (PMM), and the distribution of gas-solid temperature and decomposition rate in dual sizes PFR lime kiln under the condition of low grade fuel has been simulated by numerical method, and the accuracy of the model has been verified by the monitoring data of control system. The results showed that calcination with 100+30 mm dual sizes improved the production efficiency compared to single sizes.