DEM-CFD Numerical Simulation and Actual Verification of Fluidized Bed Calciner for Cement Production

Abstract

A numerical calculation method of the fluidized bed calciner for cement production including pulverized coal combustion, raw material decarbonation reaction and heat transfer was developed using the coupling simulation method of DEM -CFD (Discrete Element Method -Computational Fluid Dynamics). In addition, in order to shorten the calculation time, a coarse-grained model for DEM was used in the DEM-CFD. Based on this, the influence of the position and the number of pulverized coal blowing lines into the calciner on the characteristics of pulverized coal combustion and the property of raw material decarbonation was investigated. As a result, a modification plan to change pulverized coal blowing lines to promote pulverized coal combustion and raw material decarbonation was found from the calculation results, and the position and the number of pulverized coal blowing lines were changed from a single pulverized coal blowing line to two blowing lines in a commercial manufacture system. Then, the modified effectiveness and the validity of the numerical calculation method were verified by measuring actual gas composition and temperature distribution in the calciner before and after modifying.