Abstract: Contrapose the temperature deviations widely existing in horizontal flue of tangentially fired furnaces, the cold state aerodynamic test has been conducted in the newlybuilt boiler of Hebei Guohua Dingzhou Power Engineering Corporation Limited, the research focused on the flue gas distribution of the furnace outlet. The experiment has shown that through adjusting the angle of separated overfired air (SOFA) nozzle, the flue gas distribution of the furnace outlet can be improved effectively, guarantee homogeneous speed between right and left flue gas, and meet the demand of normal operation.

Key words: supercritical once-through boiler, tangential firing, aerodynamic field test, flue gas speed