TY - JOUR
TI - Numerical simulation of multiphase flow in ventilation mill and channel with louvers and centrifugal separator
AU - Kozić Mirko S
AU - Ristić Slavica S
AU - Puharić Mirjana A
AU - Katavić Boris T
JN - Thermal Science
PY - 2011
VL - 15
IS - 3
SP - 677
EP - 689
PT - Article
AB - This paper presents the results of numerical flow simulation in ventilation  mill of Kostolac B power plant, where louvers and centrifugal separator with  adjustable blade angle are used. Numerical simulations of multiphase flow  were performed using the Euler-Euler and Euler-Lagrange approach of ANSYS  FLUENT software package. The results of numerical simulations are compared  with measurements in the mill for both types of separators. Due to very  complex geometry and large number of the grid cells, convergent solution with  the Eulerian model could not be obtained. For this reason the mixture model  was employed resulting in very good agreement with measurements, concerning  the gas mixture distribution and velocity at the main and secondary burners.  There was large difference between the numerical results and measurements for  the pulverized coal distribution at the burners. Taking into consideration  that we analyzed dilute mixture with very low volume fraction of the coal,  the only choice was the Euler-Lagrange approach, i.e. discrete phase model  limited to volume fraction of the discrete phase less than 10-12%. Obtained  distributions of the coal at the burners agree well for both types of  separators.