Abstract
AbstractW-shaped furnaces equipped with swirl burners suffered from high carbon content in fly ash and high NOx emission. Using an IFA 300 constant-temperature anemometer system, cold air experiments on a scale model of a 300-MW of electrical output down-fired pulverized-coal utility boiler with swirl burners were performed to investigate the effect of the declination angle of vent air on flow characteristics of the furnace. When the angle of vent air was 28°, 35°, and 40°, the flow field in the furnace has good symmetry, which was beneficial to the stable combustion of the flame. As the angle of vent air increased, the mixing of downward airflow and vent air was delayed. At a vent-air angle of 45°, the flow field in the furnace was deflected. The deflected flow field would result in a flame short circuit, the local high temperature, an increase in the carbon content in fly ash, and a reduction of boiler efficiency. The angle of vent air had little effect on the mixing of downward airflow and staged air. ...
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