对某电厂锅炉吹灰蒸汽管道取样,进行材质检验、管道强度测试和剩余寿命计算。结果表明: 该管道的几何尺寸、化学成分、显微组织和力学性能均符合标准要求; 该管道实际壁厚和直管环向应力均满足强度要求; 在工作压力小于4 MPa、工作温度小于400 ℃条件下, 直管段剩余寿命大于1×105 h。

The steam pipelines of the boiler soot blower of a power plant were sampled and analyzed from the aspects of material quality inspection, pipeline strength and remaining life calculation. The results show that: the geometric dimension, chemical composition, microstructure and mechanical properties of the pipelines could meet the standard requirements. By calculation, the actual thickness of the pipeline and straight pipe hoop stress could meet the strength requirements. When the working pressure was less than 4 MPa and working temperature was less than 400 ℃, the remaining life of the straight pipe was more than 1×105 h.