In this study, flame structures, boiler efficiency and exhaust gas temperatures were investigated numerically at different thermal power and excess air ratio in a liquid fuelled boiler. Calculations were carried out at two dimensional axisymmetric conditions and Fluent was used as the computational fluid dynamics software. In all studies, the standard k-ε model was used for modelling the turbulent flow, the species transport model was used for modelling the combustion, and the pressurized swirl atomizer was used for modelling the injection. The calculations showed, that the droplet diameters after injection were reduced and droplets evaporated in a shorter period with increasing excess air. Exhaust gas temperatures were raised with the increasing boiler thermal power and excess air ratio. As expected, the higher flue gas temperature and excess air ratio showed lower boiler efficiency.
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