Boiler as one of the main equipment in steam power plant system that has important function as steam generation for rotating turbine.Failure of boiler result in operational cause lowering the power capacity of the steam power plant system on the whole.From the data observation,boiler failure frequencies because of leakage on boiler tubes.To analyze the boiler tube failure accurately,information of temperature operated on the outer surface tube and temperature distribution on the furnace wall are needed.The main objective of this study is to investigate several areas in which the failure of furnace water walls boiler exists.A combined analysis of thermal and strength of material has been performed,in order to calculate the temperature and velocity fields inside furnace of the water tube boiler.Due to the geometrical complexity of the model,GAMBIT applications was used to generate a computer-based model.All numerical calculations have been performed using the commercial CFD package FLUENT.The results obtained were numerically that failure on furnace water walls in water tube boiler because there is localized overheating.
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