针对某电厂600 MW墙式对冲燃烧锅炉在低氮燃烧改造后存在严重的水冷壁高温腐蚀问题，采取LYCTWA型贴壁风系统对其进行了高温腐蚀治理改造。通过全炉膛数值模拟与现场试验相结合的方法，研究了侧墙壁面区域的烟气成分分布以及不同的贴壁风布置方案对炉内燃烧及高温硫腐蚀的影响。结果表明：模拟结果与电厂实际腐蚀区域相吻合，腐蚀区域主要集中在第2层主燃烧器至燃尽风间的侧墙区域。加装了贴壁风系统后，数值模拟和试验结果均显示侧墙还原性气体体积分数大幅降低，水冷壁贴壁气氛得到显著改善。

For resolving the serious high temperature corrosion problem of water wall of a 600 MW wall type opposed firing boiler after low nitrogen combustion transformation,the LYCTWA type wall air system was adopted to treat the high temperature corrosion of the boiler.Through the methods of numerical simulation and field test,the distribution of flue gas composition in the side wall area was analyzed,and the effects of different wall air arrangements on the combustion performance of the boiler and high temperature sulfur corrosion were also studied.The results show that,the simulation results were consistent with the actual corrosion area of the power plant,and the corrosion area was mainly in the side wall area between the second main burner and the room of overfire air(OFA).Furthermore,it was found that,after the installation of the wall air system,the volume fraction of reducing gas in the side wall was greatly reduced,and the atmosphere of water wall was greatly improved.

TK224.1

国家能源集团科技项目（GJNY-20-10-4）