Multiscale simulation and analysis on the diffusion of the waste incineration flue gas

The large number of secondary pollutants, which were produced from waste incineration flue gas, would cause the highly admired waste incineration power generating project into questions. The CFD technology was applied to simulate the diffusion characteristics of waste incineration flue gas from chimney, to investigate the flow and pollutant distribution at multiscale space conditions. The standard k-ε turbulence model and component transport model were adopted to evaluate the pollutant distribution influence between buildings at downwind 1.4 km from discharge position with different exhaust height and velocity. It was found that the concentration distribution of flue gas pollutant, such as SO₂ and TCDD, decreased with the increase of exhaust height and velocity, and a higher pollutant concentration on the leeward of buildings was caused by the vortex induced from wind field. Finally, the analysis results of Gaussian plume model were found to be in a good agreement with the simulation results.