Abstract

The combustion mechanism of pulverized coal in a DRB-4Z burner are analyzed and the temperature distribution, char burnout and CO production in the burner outlet area are obtained. The gas phase turbulence model is the Realizable k-ε two equation model, and radiation heat transfer model is P-1 radiation model. The discrete phase model is used to simulate the force and motion trajectory of the pulverized coal particles, and the stochastic model is used to simulate the flow of coal particles. The combustion model is non-premixed combustion model, and the devolatilization model is two competing rates model; char combustion model is kinetics/diffusion-limited model. Numerical results revealed the mechanism of pulverized coal devolatilization and char combustion, and the solution may give reference to air arrangement of the same type of burners.

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