【摘要】 对燃用高碱煤的330 MW切圆燃烧煤粉锅炉开展数值模拟，预测不同假想切圆直径与配风方式等工况下的燃烧特性和受热面易腐蚀位置。结果表明：当假想切圆直径为800～1 000 mm时，随着直径增加，高温区面积呈先增后减再增的趋势，燃烧反应增强；当假想切圆直径进一步增大时，水冷壁腐蚀风险随之增加；相较于均匀配风的基准工况，增大下部喷嘴风量有利于燃料充分混合燃烧；在减小底层风量的配风方式下，底部中心切圆直径增大，上层区域氧气充足，燃烧更充分，炉膛整体温度较其他工况有所上升。此外，CO主要分布于高温区域，在减少中间喷嘴风量的配风方式下，燃烧器区中间层的CO含量较高；炉膛底部与顶层分离燃尽风（SOFA）之间的壁面区域，易发生由SO₂引发的高温腐蚀现象。更多还原

【Abstract】 Numerical simulations were conducted on a 330 MW tangential coal-fired boiler burning high-alkali coal to predict the combustion characteristics and the easily corroded positions of the heating surface under different imaginary circle diameters and air distribution methods conditions. The results show that when the imaginary circle diameter is 800-1 000 mm,with the increase of the diameter,the area of the high-temperature zone shows a trend of first increasing,then decreasing and then increasing again,and the combustion reaction is enhanced. When the imaginary circle diameter further increases,the risk of the water cooled wall corrosion increases. Compared with the reference condition of uniform air distribution,increasing the air volume of the lower nozzle is conducive to the thorough mixing and combustion of fuel. In the air distribution method of reducing the air volume at the bottom layer,the diameter of the tangent circle at the center of the bottom layer increases. The upper layer area has sufficient oxygen,and the combustion is more complete. The overall temperature of the furnace is higher than that under other conditions. Furthermore,CO is mainly distributed in the high-temperature area. The CO content in the middle layer of the burner area is higher under the air distribution method of reducing the air volume of the middle nozzle. The wall area between the bottom and the top separated overfire air（SOFA） is prone to high-temperature corrosion caused by SO₂.更多还原