发电机定子线棒堵塞问题分析及清洗预膜效果评价

Generator stator bar corrosion clogging problem analysis and effect evaluation after cleaning membrane

为了弄清某厂660 MW机组发电机线棒超温的原因和化学清洗预膜剂在定子线棒内表面保护膜的形成状况;利用发电机热水流试验对该发电机进行了堵塞状况检查,利用扫描电镜和能谱仪对堵塞物进行了成分分析,并对清洗预膜后的定子线棒样品进行了面元素定性定量分析和线扫描分析。结果表明,通过分析发电机的热水流试验得到线棒温降曲线能够比较准确地判断线棒的实际堵塞状况,而且通过化学清洗前后的两次试验能对清洗效果进行评价,通过对堵塞物的成分分析能为化学清洗的实施提供重要的指导,利用2-巯基苯并噻唑作为主要预膜剂的复合预膜液能在空心导线内表面上形成均匀、连续的由C、O、S组成的保护膜。

In order to found out the cause of the 660 MW generator stator bar overtemperature. Heat flow test was used to check congestion degree. Using scanning electronic microscope（ SEM） and energy- dispersive spectrometer（ EDS） to check the corrosion and composition analysis are obtained. SEM and EDS were also used to analyze the surface element in order to check the inner surface protective film. The experimental results show that the temperature drop curve reflect the blockage of the generator bar. By analyzing blockage of components provide important guidance for the implementation of the chemical cleaning. 2- mercapto benzothiazole can form uniform continuous protective film composed of C,O,Selements.