1000 MW级机组低压缸轴承低速碾瓦原因分析及防控措施

Cause Analysis and Prevention Measures for Low Pressure Cylinder Bearing Shell Damage at Low Speed in 1 000 MW Unit

以某电厂1 000 MW级超超临界机组低转速下时低压缸轴承碾扎事故为例,结合事故数据、事故过程曲线以及轴承翻瓦检查情况等,对低转速下碾瓦机理及事故发生的原因进行分析,指出了低压缸轴承座变形以及轴承自位性能不良为引发事故的主要原因,通过在检修工艺控制、轴承供油结构改进和运行调整方面采取关键措施,可有效预防事故发生,保障汽轮机设备的安全运行。

Based on the case study of a 1 000 MW ultra-supercritical unit at low speed in a power plant where the low pressure cylinder bearing had the grinding accident, this paper analyzes the causes according to the accident data, accident process curve and bearing shell inspection. The result shows that the low pressure cylinder bearing housing deformation and bearing self-aligning poor performance are the main causes for the accident. The maintenance process control, the bearing oil supply structure improvement and operation adjustment are the key measures to effectively prevent the accident, and ensure the safety of the steam turbine equipment.