恒力吊架力学性能对低温再热蒸汽管道热位移的影响

Effects of Mechanical Properties of Constant Force Hangers on Thermal Displacement of Low-temperature Steam Pipes

采用JY—20便携式测试系统,对某火电厂低温再热蒸汽管道恒力吊架的恒定度和载荷偏差进行了测试,探讨了恒力吊架力学性能对低温再热蒸汽管道热位移产生的影响。结果表明:恒力吊架载荷偏差及恒定度不合格是造成低温再热蒸汽管道无法复位的主要原因;更换性能合格的恒力吊架后,恒力吊架的位移指针基本能回复到原位,管道热位移正常,且各主要管种的最大一次应力和二次应力均在其允许值范围内。

Using JY-20 portable test system, the constant degree and load deviation of constant force hangers of low-temperature reheat steam pipes of a power plant were tested, and the effects of mechanical properties of constant force hangers on thermal displacement of low-temperature steam pipes were studied. The results show that the unqualified constant degree and load deviation of the constant force hangers were main reasons of low- temperature reheat steam pipes being unable to reset. After replacing qualified constant force hangers, the displacement pointer could return to its original position, the pipeline thermal displacement was normal and the main pipes maximum primary stress and secondary stress were all in their allowed ranges.