Faculty of Mechanical Engineering

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Author: search.filters.author.Risto V. FilkoskiEnd date: 2009

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    Radiation Heat Transfer Modelling and CFD Analysis of Pulverised-Coal Combustion with Staged Air Introduction
    (PAN - Polish Academy of Sciences, 2009-10)
    Risto V. Filkoski
    Modelling of fossil fuel utility and industrial boilers has reached a remarkable development in recent years. Particular attention in optimisation of a utility boiler furnace operation, is given to the flame geometry and position. Combustion chamber designers endeavour to achieve optimum operating conditions that give maximum combustion efficiency, as well as minimum pollutant formation rate. The application of computational fluid dynamics (CFD) modelling technique and other advanced mathematical methods offer opportunities for analysis, optimisation and options examination in order to increase the overall efficiency of the energy facilities. The main purpose of the present study was to investigate how the results obtained with two radiative heat transfer methods, the P1 approximation method and the discrete ordinates (DO) method, fit temperature field in a boiler furnace on pulverised coal, with implemented over-fire air (OFA) ports. The framework of the CFD modelling approach is described. The numerical modelling results for boiler baseline operating conditions are compared with a test matrix of local temperature measurements. An accuracy analysis of the P1 and DO methods is done on a basis of a comparison between the numerically obtained and measured temperature profiles.
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    VERIFICATION OF METHOD FOR ESTIMATING COMBUSTION EFFICIENCY IN A BUBBLING FB COMBUSTOR
    (Vinča Institute of Nuclear Sciences, Belgrade, 2000-11)
    Risto V. Filkoski
    ;
    Longin Przybylski
    ;
    Ilija J. Petrovski
    The article refers to a mathematical method for estimating the efficiency of the combustion process in bubbling fluidised bed conditions. The calculation procedure used in this work is given elsewhere [1, 2] and, here, it is only briefly described. The objective of the present investigation is to validate the mentioned method when using brown coal as a fuel in a laboratory fluidised bed combustor. Particular attention is devoted to the subject of elutriation of fuel particles out of the combustor, considering the fact that it is one of the most important factors limiting the combustion efficiency and the furnace design as well. The work presented here contains the conditions and some results of experimental research in heat losses resulting from the phenomenon of elutriation of combustible particles [3]. Experiments were carried out in a combustor with an inner diameter of 200 mm and a height of 1200 mm. A numerical testing of the method for estimating the combustion efficiency was accomplished within a bed temperature range from 780 °C to 900 °C and a fluidising velocity from 1.20 to 1.32 m/s. The results achieved were compared with the experimentally obtained data. Besides the appearance of some deviations, it may be stated that the results are reasonable and in line with the expectations.