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某电厂330MW机组锅炉采用双调风旋流燃烧器,前墙布置。该厂实际运行中一次风速与设计值相比相差较大,较大的一次风速造成了燃烧器一次风管磨损严重,同时后墙水冷壁高温腐蚀的可能性增大。该文提出保持原燃烧器一次风管尺寸不变,减小中心风管直径、增大一次风流通面积以减小一次风速的改造方案。为研究改变中心风管直径后的4层燃烧器对炉膛燃烧的影响,采用数值模拟的方法对该型锅炉炉内的温度场进行数值计算,得到5种不同方案下该型锅炉炉内的温度场分布,并分析了中心风管直径的改变对炉内温度场的影响规律,即后墙近壁区温度随着中心风管直径的减小呈现先降低后升高的趋势。通过对5种方案数值模拟结果的比较分析,得到了对炉膛后墙安全性影响最小的方案,为电厂的实际改造提供参考。
A power plant 330MW unit boiler with dual-tone cyclone burner, the front wall layout. The actual operation of the wind speed and the design value of a larger difference between the larger primary air duct caused a serious wear and tear of the duct, while the possibility of high temperature corrosion of the wall water wall increased. In this paper, a scheme of maintaining the primary duct size of the original burner, reducing the diameter of the central duct, and increasing the primary air circulation area to reduce the primary air velocity is proposed. In order to study the influence of the four-layer burner on the furnace combustion after changing the center duct diameter, the temperature field in the boiler is numerically calculated by numerical simulation, and the temperature in the boiler under five different schemes is obtained Field distribution and the influence of the change of the diameter of the central duct on the temperature field in the furnace is analyzed. The temperature of the wall in the rear wall decreases first and then increases with the decrease of the diameter of the central duct. Through the comparison and analysis of the numerical results of the five kinds of schemes, the scheme that has the least impact on the safety of the rear wall of the furnace is obtained, which provides a reference for the actual reconstruction of the power plant.