一起25MW灯泡贯流机组发导轴承烧瓦事故处理技术

Treatment Technology of a Guide Bearing Burning Accident of 25MW Bulb Tubular Hydro Generator

某电站一台25MW灯泡贯流式水轮发电机组经过A修后在投产运行过程中出现,发电机导轴承温度异常升高而被迫停机,后续检查发现系发电机导轴承烧瓦。该型机组烧瓦事故抢修难度大,存在空间狭小、耗时耗力、危险性大等突出特点,为减少抢修工作量和工期,采取在不拆除机组大件的情况下进行发电机导轴承瓦更换,专业技术人员讨论分析后,制定科学、合理、安全的抢修方案,量身定制临时专用工器具,并加强检修重点、难点工艺步骤的管控,最终在各方努力下,为期21天,成功完成抢修任务,后续整体运行情况良好,与常规解体检修相比,大大缩短了工期,节约了大量人力物力,现将抢修过程基本工艺步骤和重点、难点、创新点加以总结,希望能对同类型事故抢修或常规检修的重点工艺起到借鉴和指导作用。

A 25MW bulb tubular turbine generator unit in a power station was forced to shut down due to abnormal temperature rise of generator guide bearing during operation after a repair.Subsequent inspection found that the generator guide bearing was burnt.The tile burning accident of this type of unit is difficult to repair,with prominent characteristics such as narrow space,time and labor consumption and high risk.In order to reduce the workload and construction period of emergency repair,professional technicians discuss and analyze the replacement of generator guide bearing tile without removing the large parts of the unit,formulate a scientific,reasonable and safe emergency repair scheme,customize temporary special tools and instruments,and strengthen the control of key and difficult process steps of maintenance,Finally,with the efforts of all parties,the emergency repair task was successfully completed for 21 days,and the subsequent overall operation was in good condition.Compared with the conventional disassembly and maintenance,the construction period was greatly shortened and a lot of manpower and material resources were saved.Now,the basic process steps,key points,difficulties and innovations of the emergency repair process are summarized,hoping to provide reference and guidance for the key processes of emergency repair or conventional maintenance of similar accidents.