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Increasing the energy efficiency of thermal power plant Kostolac B by the revitalization of ventilation mills 2017 http://ezaposleni.singidunum.ac.rs/rest/sciNaucniRezultati/oai/record/2/10226 https://www.tandfonline.com/doi/full/10.1080/15567249.2015.1014977 M. Ristić LJ. Radovanović R. Prokić Cvetković G. Otić J. Perišić I. Vasović Ventilation mill for grinding coal is one of the main steam power plants in the system that makes a significant effect on the level of energy efficiency with its work. The aim of this paper is to increase the energy efficiency of thermo power plant Kostolac B by reducing the problem of wear in ventilation mill for coal grinding. The idea of this research is to investigate the optimum hardfacing technologies to increase wear resistance of impact plates in ventilation mill. Before applying hardfacing on impact plates in the exploitation conditions, it is necessary to model test hardfaced samples for determination of the optimal technology and filler material for revitalization. The relative weight loss of the impact plates after 1440 h period of exploitation in real conditions is very small, 5–8%. The application of this approach can reduce the number of possible repairs and extends the period between them, resulting in significant economic effects. Before and after revitalization of ventilation mill is conducted analyzing of failure during the working period. In this paper, we present time of repair of ventilation mills number 22, 23, 24 and 25, the number of repairs before and after revitalization and cost of repairs. article 10.1080/15567249.2015.1014977 12 2 191 197 1556-7249 Energy Sources, Part B: Economics, Planning, and Policy, Taylor&Francis Online