Abstract: The power industry requires coal combustion techniques that show flame stability, no slagging propensity and high combustion efficiency that also meet pollution control standards. The quality of coal provided to Chinese power plants often fluctuates and is usually on the low side. Generally the flame from these coals is not stable. In view of these problems, the centrally fuel rich swirl coal combustion burner is proposed. Gas/particle flow of burner has great impact on the performance of the burner. By using realizable k-ε model and Lagrangian stochastic trajectory model, the characteristics of gas-particle flows near the new burner are obtained. The numerical results and experiment data are compared. The velocity distribution tendency of numerical results and experiment data are almost the same. The results of calculation and 3D phase-Doppler anemometry experiment indicate that there is a central recirculation zone near the burner. The distribution of the tangential velocities is a Rankine-type vortex. The radial velocities are low near the chamber axis. When the axial velocities of particles become 0 m/s, the direction of particles movement deflects radially. The trajectory is advantageous to increase the particle residence time in the burner central recirculation zone.

Key words: Burner, Coal combustion, Gas-particle flow, Numerical simulation, Three-dimensional phase-Doppler anemometry