Abstract
Combustion of pulverized biomass in a laboratory swirl burner is computationally investigated. The two-phase flow is modelled by an Eulerian-Lagrangian approach. The particle size distribution and turbulent particle dispersion are considered. The radiative heat transfer is modelled by the P1 method. For modelling turbulence, different RANS modelling approaches are applied. The pyrolysis of the solid fuel is modelled by a single step mechanism. For the combustion of the volatiles a two-step reaction mechanism is applied. The gas-phase conversion rate is modelled by the Eddy Dissipation Model, combined with kinetics control. The results are compared with measurements.
Highlights
For the generation of power and heat, combustion is being used as the major process since many decades [13]
Different turbulence viscosity based turbulence models are considered such as the Standard k-ε model [27] (S-KE), the Realizable k-ε model [28] (R-KE) and the Shear Stress Transport k-ω model [29,30] (SST)
Compared to Standard k-ε model [27] (S-KE), the flame brush predicted by Realizable k-ε model [28] (R-KE) more slender and longer in shape and has a smaller radial extension
Summary
For the generation of power and heat, combustion is being used as the major process since many decades [13]. Usually only a rather small portion of the energy feed (
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