烟气轮机动叶片断裂失效原因分析  

Analysis of Fracture Failure Causes of Moving Blades of Flue Gas Turbine

作　　者：林维华 王乐乐 荆亮 LIN Wei-hua;WANG Le-le;JING Liang(Shandong Jincheng Petrochemical Group Co.Ltd.,Zibo 255000,China)

机构地区：[1]山东金诚石化集团有限公司,山东淄博255000

出　　处：《石油化工设备》2024年第5期81-85,共5页Petro-Chemical Equipment

摘　　要：对一起催化裂化装置烟气轮机异常振动导致的停机故障进行了拆机检查,针对宏观检查发现的动叶片断裂和磨损情况,采用多种技术手段进行了取样检验检测,应用有限元数值模拟进行了动叶片应力分析。结果表明,叶片先从榫齿处发生断裂,在跟随转子高速旋转时,断裂的叶身撞击相邻3片叶片,致使其也发生严重变形,并引发机组振动连锁停机及装置停车。烟气轮机动叶片气动设计存在安全裕度低问题,榫齿与榫槽存在局部应力集中问题,烟机动叶片与围带之间存在轻微结垢。根据分析结果采取了针对性优化措施,改进后取得良好效果,保障了烟气轮机的长周期平稳运行。The shutdown fault caused by the abnormal vibration of the flue gas turbine of a catalytic cracking unit was dismantled and inspected.Various technical means were employed for sampling inspection and testing,with the objective of identifying the fracture and wear of the moving blade that had been identified by macroscopic inspection.Stress analysis of the moving blade was carried out by finite element numerical simulation.The results indicate that the blade fractures from the tenon tooth,and subsequently,the broken blade body contacts the adjacent three blades when it rotates at high speed with the rotor,resulting in significant deformation and the initiation of the vibration interlocking shutdown of the unit and the shutdown of the device.The aerodynamic design of the flue gas turbine moving blades exhibits a low safety margin,while local stress concentration problems are evident in the tenon teeth and tenon grooves.Additionally,slight scaling occurs between the flue gas turbine moving blades and the enclosure belts.The results of the analysis indicated the necessity for targeted optimization measures,which were implemented and resulted in the achievement of positive outcomes.These measures ensured the long-term stability of the flue gas turbine.

关 键 词：烟气轮机 动叶片 断裂 失效分析 

分 类 号：TQ050.7[化学工程]