Nigerian Journal of Technology

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Exergetic Modelling of Oil-Fired Steam Boilers

IO Ohijeagbon, MA Waheed, SO Jekayinfa, OA Lasode


The performance variables and potential for energy savings in oil-fired industrial steam boilers were studied. Operational parameters of steam boilers using low pour fuel oil (LPFO) and diesel were used to determine thermodynamic properties of material streams and exergetic parameters. Analysis of thermodynamic properties on exergetic performance of boilers was conducted. Exergetic models developed are also presented. The ratio of the energy to exergy efficiencies of the heat exchanging unit and of the entire steam boiler was determined as 1.4 and 1.8614 respectively. The average overall boiler exergy destruction decreased by 14.62%, as the evaporation ratio increased from 10 to 14 though heat loss in boiler was found to increase with increases in evaporation ratio. Developed models in this study could be employed to analyse and estimate exergetic performance indices of oil-fired steam boilers in order to enhance their efficiencies and reduce energy wastage.
AJOL African Journals Online