Numerical simulation of multiphase flow in ventilation mill and channel with louvers and centrifugal separator

Thermal Science

关键词: ventilation mill;    CFD;    multiphase flow;    Euler-Euler approach;    mixture model;    Euler-Lagrange approach;   

DOI  :  10.2298/TSCI101203018K

来源: DOAJ

【 摘 要 】

This paper presents the results of numerical flow simulation in ventilationmill of Kostolac B power plant, where louvers and centrifugal separator withadjustable blade angle are used. Numerical simulations of multiphase flowwere performed using the Euler-Euler and Euler-Lagrange approach of ANSYSFLUENT software package. The results of numerical simulations are comparedwith measurements in the mill for both types of separators. Due to verycomplex geometry and large number of the grid cells, convergent solution withthe Eulerian model could not be obtained. For this reason the mixture modelwas employed resulting in very good agreement with measurements, concerningthe gas mixture distribution and velocity at the main and secondary burners.There was large difference between the numerical results and measurements forthe pulverized coal distribution at the burners. Taking into considerationthat we analyzed dilute mixture with very low volume fraction of the coal,the only choice was the Euler-Lagrange approach, i.e. discrete phase modellimited to volume fraction of the discrete phase less than 10-12%. Obtaineddistributions of the coal at the burners agree well for both types ofseparators.

【 授权许可】

Unknown