Abstract: In order to study the heat transfer characteristics of swirl burners under different air volume ratios, a 600 MW supercritical front and rear hedgeboiler in a power plant is simulated and calculated based on CFD technology, so as to obtain the cold state power field,hot state temperature field and component distribution under different air volumes, and the obtained data are processed and analyzed. The results show that when the central wind speed is less than 6 m/s, the central wind rigidity is poor, the average flow field velocity is low, and it cannot resist the return of high temperature flue gas. When the central wind speed is more than 8 m/s, it is easy to cause turbulence in the backflow zone, affecting the uniformity and stability of the power field. If the center wind increases 5 m/s the ignition point position will be postponed by about 6%, while the maximum temperature of coal powder ignition increases by about 34%. This is because the rigidity of the central wind is constantly increasing,thereby guiding the flue gas recirculation area to converge and form a high-speed airflow field, and quickly igniting the air-powder mixture to achieve full combustion.

Key words: swirl burner, heat transfer characteristics, central wind, front and rear hedge boiler, numerical simulation