摘 要：为减少350 MW超临界机组因锅炉氧化皮脱落而引起的堵塞爆管问题,针对某电力公司8台超临界煤粉锅炉的结构型式及运行工况展开调查研究，分析结构设计对锅炉高温受热面蒸汽侧氧化皮的影响，发现烟温偏差的叠加效应是引起高温再热器汽温偏差大和局部氧化皮生成过快的主要原因，针对锅炉高温受热面的SA-213TP347H不锈钢管材的金属壁温适用范围进行对比，确定其最佳金属壁温报警值为600 ℃；通过对锅炉给水加氧设备进行改造，控制给水含氧量在10～20 靏/L范围内,确保高温受热面蒸汽侧含氧量为零。实践证明，采取上述氧化皮防治措施后，锅炉氧化皮堆积数量同比减少85%以上。

Abstract:In order to reduce the problem of plugging in the 350 MW supercritical unit, the structure type and operating condition of 8 supercritical pulverized coal fired boilers are investigated. The effect of structural design on the steam side oxide scale of the heating surface of the boiler is analyzed. It is found that the superposition effect of the smoke temperature deviation is the main reason causing the high temperature deviation of the high temperature reheater and the overgrowth of the local oxidation. By comparing the application range of the metal wall temperature for the stainless steel pipe with SA-213TP347H. It is determined that the optimum alarming metal wall temperature should be 600 degrees C, the oxygen content in the water supply in the range of 10~20 μm/L, and the oxygen content of the steam side of the heated surface at 0μm /L. Practice has proved that with the above oxide scale control measures, the number of oxide scale formation of the boiler is decreased by more than 85%.

TK229.2