9F燃气-蒸汽联合循环机组汽缸变形分析与处理

Analysis and Treatment on the Deformation of Steam Turbine Cylinders in a 9F Gas-Steam Combined Cycle Unit

针对某9F燃气-蒸汽联合循环机组阀门检修过程中汽轮机高中压缸严重变形,对比正常设计工况和阀门检修工况的计算结果进行分析,并提出相应改进措施。结果表明:阀门检修工况下汽缸接口处端口推力及力矩增大,导致高中压缸严重变形;在检修过程中采用固定结构可有效解决该问题。

Aiming at the deformation faults existing in the high and medium pressure cylinder during the overhaul of a 9F gas-steam combined cycle unit,an analysis was conducted on the calculation results for the high-pressure main steam pipe and reheat steam pipe under normal design condition and valve overhaul condition,after which,corresponding countermeasures were proposed.Results show that the serious deformation faults existing in the high and medium pressure cylinder are found to be caused by the increase of thrust/moment at the interface of the lower cylinder during valve overhaul.The problem can be solved by adopting a fixed structure in the process of overhaul.