THERMAL SCIENCE

International Scientific Journal

Mirko S. Kozić

,

Slavica S. Ristić

,

Mirjana A. Puharić

,

Boris T. Katavić

NUMERICAL SIMULATION OF MULTIPHASE FLOW IN VENTILATION MILL AND CHANNEL WITH LOUVERS AND CENTRIFUGAL SEPARATOR

ABSTRACT
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.
KEYWORDS
ventilation mill, CFD, multiphase flow, Euler-Euler approach, mixture model, Euler-Lagrange approach
PAPER SUBMITTED: 2010-12-03
PAPER REVISED: 2010-01-22
PAPER ACCEPTED: 2011-02-24
DOI REFERENCE: https://doi.org/10.2298/TSCI101203018K
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2011, VOLUME 15, ISSUE Issue 3, PAGES [677 - 689]
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Numerical simulation of multiphase flow in ventilation mill and channel with louvers and centrifugal separator

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