Abstract
This paper presents results of the analyses obtained by numerical simulation for the possibilities of increasing the wear resistance of the ventilation mill working parts for coal grinding in the Kostolac B power plant. The possibilities for modification are based on 3D numerical simulation of multiphase flow of ventilation mill. Mineral materials during the process of milling in the ventilation mill cause strong wear of the suction plates. The multiphase flow simulations are performed in order to obtain the mineral materials paths and velocity vectors. The mixture model of the Euler-Euler approach is used. The results obtained in the numerical simulation serve for the selection of an optimal redesign of the suction plates. The application of this approach can reduce the number of possible repairs and extends the period between them, resulting in significant economic effects.
Highlights
Wear is one of main failure mechanism materials and equipment and exists in many industrial fields, such as metallurgy, mining industries, energy sources and construction industry
The results show the distribution of velocity vectors; volume fraction of the granular phases, turbulences and particle paths of the granular phases in the mill; attention is focused on results related to the gas mixture and sand
The numerical simulations of the multiphase flow are presented for a ventilation mill in the Kostolac B power plant
Summary
Wear is one of main failure mechanism materials and equipment and exists in many industrial fields, such as metallurgy, mining industries, energy sources and construction industry. The main aim of this paper is to increase the wear resistance of the suction plates of ventilation mill for coal grinding in power plants in order to define optimal technology of revitalization by hardfacing. A numerical simulation method is used to investigate the complex, multiphase flow in the ventilation mills in thermo power plant Kostolac B in Serbia, by CFD software package ANSYS FLUENT. Previous research in this ventilation mill for mill impact plates redesigning, confirmed numerical simulation as a good tool for reducing the number of experiments and for a more precise analysis of conditions for implementing appropriate hardfacing technology. Numerical simulation is used to achieve better uderstanding of the behaviour of the mixture (coil and other mineral particles); their attack angle on the working part, can be used for determination of a dominant wear mechanism
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