双炉膛双切圆电站锅炉水冷壁防高温腐蚀数值模拟研究

Numerical Simulationon High Temperature Corrosion Resistance on Water Cooled Furnace Wall of Double-cut Boiler

锅炉水冷壁高温腐蚀是影响大型火力发电机组安全、经济运行的主要因素之一。文中针对某国内1000 MW双切圆锅炉试运行期间左右墙水冷壁发生高温腐蚀的现象,通过Fluent数值模拟,分别研究了燃烧器高宽比和二次喷口摆动角度对水冷壁高温腐蚀的影响。模拟结果表明:锅炉在实际运行时应使用高宽比较小的燃烧器组合方式;二次风喷口在向上摆动15°时燃烧区域贴壁面处CO浓度均小于3%,氧气含量充足,可以有效降低水冷壁高温腐蚀的风险。

High-temperature corrosion on water cooled furnace wall of boiler is a paramount affecting factor on safety and economical operation of thermal power units.In this paper,the high-temperature corrosion on left and right water cooled furnace wall of a domestic 1000 MW double-cut round boiler was researched.Influences of burner aspect ratio and secondary nozzle swing angle on the water cooled furnace wall with high-temperature corrosion was investigated by numerical simulation(commercial software:Fluent).The numerical results show that the boiler should be applied in the burner assemble with a relatively lower aspect-ratio.When secondary air nozzle swings upward by 15°,the CO concentration in near-wall region was less than 3%.In addition,oxygen content was sufficient to effectively reduce the risk of high-temperature corrosion on water cooled furnace wall.