对大型四角切向喷燃锅炉中由于燃烧器四角布置带来的炉内燃烧不均匀性引起的炉膛出口烟温偏差大，以至引起锅炉主蒸汽和再热蒸汽温度偏差较大的原因进行了数值研究，探讨了不同燃烧条件下一、二次风旋转方向、屏式过热器、二次风切圆直径等对烟温偏差的影响，提出了改进措施 In the large square tangentially fired boiler, the flue gas temperature deviation at the exit of the furnace caused by uneven combustion in the furnace caused by the four corners of the burner arrangement is large, so that the temperature deviation between the main steam and the reheat steam in the boiler is large. The influences of the rotation direction of the primary and secondary air under different combustion conditions, the screen superheater, the diameter of the secondary wind cutting circle on the deviation of flue gas temperature were studied and the improvement measures