Optimization Of An Industrial Coal Pulvirezed Swirled Burner By Cfd Modelling

In this study an industrial pulverized coal swirl burner has been modelled by a CFD commercial code , Fluent 6.2.16. The current study focuses on the modelling of coal combustion, taking into account: coal devolatilisation, volatile combustion and char combustion. Previous to simulate the real industrial burner, three-dimensional numerical simulations of a pulverized coal furnace (IFRF) were used to assess the influence of the coal combustion model on predicted results, by comparison with experimental data. In particular, two different combustion models have been used for the volatile combustion: the equilibrium mixture fraction model (PDF), and the Finite Rate model where the turbulence-chemistry interaction has been modelled with the Eddy Dissipation. After these investigations the PDF combustion model has been chosen to study a real industrial burner and to estimate the NOx. A 3-D numerical model of the burner was studied under different operating conditions. The computations were performed to show the effect of the primary and secondary mass flow rate on the burner performance, with particular attention to the NO emissions