Numerical Simulation of Pulverized coal Flameless Combustion

Abstract:

Numerical simulation of flameless combustion of pulverized coal was carried out by species transport method. Realizable kε model was used to simulate gas phase turbulent. The solid phase was solved by particle stochastic trajectory model. Thermal volatilization was made by the CPD model. Turbulent chemical reaction was simulated via eddy dissipation model. Intrinsic model was used to simulate Particle of pulverized coal surface combustion. Radiation heat transfer simulation was carried out with P1 radiation model. The result shows that experimental data are accurately predicted by the numerical simulation. Flameless combustion takes place in whole furnace, the maximum temperature difference is about 200K and the temperature is well distributed in furnace. The flameless combustion is in low O2 concentration and low emission of NOx.

Key words:flameless combustion of pulverized coal; numerical simulation; species transport method