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Ultima descărcare din IBN: 2018-08-17 09:14 |
SM ISO690:2012 FILKOSKI, Risto, PETROVSKI, Ilija. Advanced Computational Methods for Complex Simulation of Thermal Processes in Power Engineering. In: Problemele Energeticii Regionale, 2007, nr. 1, pp. 1-13. ISSN 1857-0070. |
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Problemele Energeticii Regionale | ||||||
Numărul 1 / 2007 / ISSN 1857-0070 | ||||||
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Pag. 1-13 | ||||||
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The overall frame and principal steps of complex numerical modelling of thermal processes in
power boiler furnaces on pulverised coal with tangential disposition of the burners are presented in the
paper. Computational fluid dynamics (CFD) technique is used as a tool to perform comprehensive
thermal analysis in two test cases. The methodology for creation of three-dimensional models of boiler
furnaces is briefly described. Standard steady k- model is employed for description of the turbulent
flow. The coupling of continuity and momentum is achieved by the SIMPLEC method. Coal
combustion is modelled by the mixture fraction/probability density function approach for the reaction
chemistry, with equilibrium assumption applied for description of the system chemistry. Thermal
radiation is computed by means of the simplified P-N model, based on expansion of the radiation
intensity into an orthogonal series of spherical harmonics.
Comparison between the simulation predictions and available site measurements leads to a
conclusion that the model produces realistic insight into the furnace processes. Qualitative agreement
of the results indicates reasonability of the calculations and validates the employed sub-models. The
described test cases and other experiences with CFD modelling stress the advantages over a purely
field data study, such as the ability to quickly and cheaply analyse a variety of design options without
actually modifying the object and the availability of significantly more data to interpret the results. |
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Cuvinte-cheie pulverised coal-fired boiler, CFD modelling, combustion, thermal radiation, heat transfer |
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