600 MW超临界CFB锅炉风道燃烧器结构改进研究

针对600 MW超临界循环流化床（CFB）锅炉调试阶段,床下启动燃烧器的内筒上部超温严重,耐火材料时有烧熔、脱落,从而造成点火风道顶板烧红、烧穿现象。分析了床下启动燃烧器发生故障的原因,提出了相应的改进措施：优化改进风道结构、加长加固启动燃烧器内筒、提高风道的强度、改善耐火材料性能等。这些措施实施后,有效防止点火风道故障的发生,保证锅炉正常点火启动,也为后续超临界CFB锅炉床下启动燃烧器结构设计及现有运行CFB锅炉的改造提供借鉴。

Research on Improvement of the Air Duct Burner of a 600-MW Supercritical CFB Boiler

In the commissioning stage of the 600-MW supercritical CFB boiler, the startup burner upper duct burnout may occur due to the overheating of the startup burner upper duct and, the damage of the refractory layer lined in the duct inner surface. Aiming at this phenomenon, the root cause of the fault is analyzed and the corresponding methods for improvement are proposed, such as optimizing the structure of the duct, lengthening and strengthening the inner cylinder of the burner, increasing the strength of the duct and improving the refractory material performance. The implementation of these methods has effectively prevented the occurrence of the fault, which ensures the ignition and startup of the boiler and can provide reference for the startup burner design of subsequent supercritical CFB boilers and the retroffing of the existing CFB boiler.