针对某330 MW流化床锅炉屏过出口集箱连接管放气管道多次发生开裂、泄漏的问题, 通过现场勘查和管系及支吊架应力计算, 分析评估了管系的应力水平, 得出管道开裂、泄漏的主要原因是管系二次应力严重超标造成的, 而管卡约束是管系二次应力超标的根本原因; 并提出了相应的降低管系应力的处理措施, 机组长期运行实践表明该处理措施效果良好, 有效地解决了放气管道开裂、泄漏的问题。该文对电站疏水、取样、放气等小口径管道支吊架的设置与安装具有参考价值。

Through on-site investigation and tubing, supports and hangers stress calculation, the multiple cracking and leakage problem of a 330 MW fluidized bed boiler deflated pipeline was analyzed. The results show that the main reason for the pipeline cracking and leakage was that the secondary stress which was caused by pipe clamp constraint was excessive seriously. Processing measures to reducing the pipeline stress were put forward, and long-term operational practice results demonstrated that the measures’s effect was good and it effectively solved the pipeline cracking and leakage problems. It could provide reference for the setting and installation of small-bore pipelines for station’s dewatering, sampling, deflating, etc.