一次风叶片倾角对旋风液态排渣锅炉燃烧及NOx释放特性的影响

Effect of Primary Air Blade Inclination Angle on Combustion and NO_x Emission of a Cyclone Boiler with Slag-tap Furnace

针对纯燃高碱煤旋风液态排渣锅炉,采用数值模拟方法研究了不同一次风叶片倾角下该锅炉炉内空气动力场、温度场及各组分质量分数分布特性,分析了一次风叶片倾角对炉内燃烧及NOx排放特性的影响。结果表明:旋风液态排渣锅炉炉内空气动力场良好,烟气充满度高,错列逆向布置的旋风燃烧器可强化燃烧;在所选工况范围内,随着一次风叶片倾角的减小,炉膛出口烟温降低,炉膛出口NOx质量浓度先降低后升高;一次风叶片倾角为30°时,炉内整体温度和煤粉燃烧效率较高,炉膛出口NOx质量浓度最低。

For the cyclone boiler with slag-tap furnace purely burning high-alkali coal, the aerodynamic field, temperature field and component distribution characteristics were numerically studied under different inclination angles of primary air blade, while the influence of the blade angle on the combustion and NO_x emission characteristics in the furnace was analyzed. Results show that, the aerodynamic field in the cyclone boiler with slag-tap furnace is good;the flue gas fills the furnace in high degree, and the cyclone burners arranged in staggered and reverse direction can enhance the combustion. Within the range of the conditions studied, as the angle of primary air blade decreases, the flue gas temperature decreases, and the NO_x concentration at furnace outlet decreases first and then increases. The overall temperature in the furnace and the combustion efficiency of pulverized coal are higher, and the NO_x concentration at furnace outlet is the lowest, when the angle of primary air blade is 30°.