某台600MW汽轮机组轴承载荷分配测试与分析

Testing and Analysis of the Load Distribution Among Bearings in a 600 MW Steam Turbine Unit

建立了汽轮机组轴承载荷分配求解数学模型。在转子联轴器两侧各布置一组应变片,采用全桥模式测试转子多个截面上的弯曲应变值,由实测应变值求解轴承载荷。应用该法开发了汽轮机组轴承载荷应变检测系统,针对某台600MW汽轮机组开展了试验研究,求出了汽轮机高压转子和两个低压转子轴承载荷分配,分析了该机组轴系对中状况。试验结果表明,该方法可以比较方便、准确地识别出轴承载荷和中心分布情况,从而指导机组安装和检修。

Established was a mathematical model for solving the load distribution among bearings in a steam turbine. A group of strain gauges was arranged at both sides of the couplings of the turbine rotor and the whole bridge mode was adopted to measure and test the bending strain values at multiple sections of the rotor,thus obtaining the loads on bearings by using the strain values actually measured. The method in question was used to develop a strain system for testing the loads on bearings of a steam turbine. An experimental study was performed of a 600 MW steam turbine unit and the loads distribution among bearings of a high pressure rotor and two low pressure rotors were obtained with the alignment of the shafting system of the unit being analyzed. The test results show that the method un-der discussion can be used to conveniently and accurately identify the load and center distribution of bearings,thus offering guidance for installation and maintenance of the unit.