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Model for large eddy simulation of pulverized coal gasification by low temperture plasma

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Pavlovic Z. N. , Stefanovic P. L.

tom z. 68 [231]

165-171

The paper proposes model for large eddy simulation (LES) of pulverized coal gasification by low temperature plasma. Due to great demand for computational resources by LES, simplified model of real plasma burner (installed at 210 MW boiler unit of TPP Nikola Tesla, Serbia) is investigated. Air-coal mixture flow through rectangular channel is simulated using LES method with Smagorinsky SGS model. Spatial discretization procedure preserves symmetry properties of underlying differential operators, while integration in time is performed by modified leapfrog scheme. Mass load of coal particles is 0,2 and uniform particles size is assumed. Plasma flame is taken into account as high-temperature heat source mounted at the channel's side wall. Particles motion is simulated using Lagrangian method, where every particle in the flow is tracked. Physical models are presented for coal devolatilisation, volatiles combustion (fast chemistry model, which is acceptable for high Damkohler number) and char burnout. LES code for twophase particulate flow is developed and results for turbulent non-reactive channel flow are presented. These results will be used as starting point for coal gasification simulation.