CFD Anlysis of Pulverised-Coal Combustion of Burner Used In Furnace with Different Radiation Models

Abstract

Pulverized coal is an important fuel for electricity production and will continue to be important for decades. Since coal is a natural resource that depends on many factors and parameters, it has variable properties and composition. Combustion chamber designers Endeavour to achieve optimum operating conditions that give maximum combustion efficiency, together with minimum pollutant formation rate. Modeling of fossil fuel utility boilers has reached a remarkable development in recent years. Particularly, the application of computational fluid dynamics (CFD) modeling technology and other advanced mathematical methods offer opportunities for analysis, optimization and options examination in order to increase the overall efficiency of the energy facilities. The main objective of the present work was to investigate how the results obtained with two radiative heat transfer methods, the P1 approximation method, Discrete Transfer and the discrete ordinates (DO) method using ANSYS FLUENT, fit temperature field in a boiler furnace on pulverized coal, with implemented over-fire air (OFA) ports. The overall framework of the CFD modeling approach is described. The numerical modeling results for boiler baseline operating conditions are compared with a test data of temperature measurements. An accuracy analysis of the P1 and DO methods is done on a basis of a comparison between the numerically obtained and measured temperature profiles.