Numerical Prediction of Risk Areas for Low Oxygen Corrosion Damages in Furnace of the Retrofitted Tangentially Fired Boiler
The modern project solution, which has been implemented on the coal combustion system in Thermal Power Plant Tuzla Unit 6, has enabled the application of low emission concept of combustion and reduction of ash slugging on walls of combustion furnace, but analysis of the operation of boiler has shown significant deviations of the characteristic operating parameters obtained by the exploitation measurements compared to their design values. Previous CFD analysis that has been conducted on the aero-mixture channel and low emission burner has shown that current system of aero-mixture separation has a complex impact on combustion process inside the furnace. In order to determine the scope of the proper coal distribution in the specific boiler furnace on the combustion process, results of previous CFD analysis in combination with data obtained with classical mathematical models, have been used as inlet data for CFD simulation of combustion process. Obtained results in this paper should enable better understanding of combustion process, determination of critical process parameters that have main impact on efficiency of the boiler and its service life. From CFD results it’s clear that shape and position of flame depends on operating mills configuration and coal rate distribution per coal burner height.