Oil gear carbon cause abnormal vibration analysis of steam turbine unit

Oil gear carbon cause abnormal vibration analysis 2019 - steam turbine unit 03 - 03 author: gaoxiang, such as hebei electric unit 1, introduction Beijing BeiChong turbo motor research institute co. , LTD and ALSTOM power generation co. , LTD. , joint design and manufacture of ZK600 - 16. 7/538/538 type subcritical, a reheat, four cylinder exhaust air condensing unit directly. 2, introduction of abnormal vibration unit just put into production, the vibration in good condition. Running two years later, the vibration problem: in the normal operation of the process, often appear vibration amplitude to climb, for no apparent reason and vibration amplitude to climb after a period of time will restore the initial value, which is easy to appear when lifting load this kind of situation. As the growth of the running time, the number of occurrences of the abnormal vibration and vibration amplitude increasing. Figure 2 # 2 and # 2 x y unit vibration trend of figure 3, vibration analysis by TSI data analysis showed that the fluctuation is mainly caused by power frequency components change in the process of vibration increase, # 2, shaft vibration phase change accordingly, and vibration after the recovery phase is to restore to the fluctuation of value, the other has not been the shaft vibration phase change; View its frequency spectrum diagram found that # 1, 2, and 3 shaft vibration during normal operation are relatively low frequency component, showed the airflow to the rotor has a slight disturbance. Against other parameters found that # 2 wawa temperature compared to other each tile temperature fluctuation is larger, the vibration increases before there is always # 2 wawa temperature decrease. Test: the load and the main steam flow, the opening of the tone and calibrate adjustment, no changes caused by vibration. Vibration cause analysis: ( 1) Abnormal vibration has certain chanciness, and operation parameters has no direct relation; （ 2) The vibration causes happened to touch the ground fault activity, touch the ground cause rotor hot bending area; （ 3) # 2 axis amplitude value and phase change significantly, infer what happened to touch the ground location should be near the bearing # 2, but specific to touch the ground components can not be sure. Check: overhaul in the high pressure cylinder the material returned to the factory, found the oil carbon severely, causing a movement to touch the ground, rubbing place has been dent, the following figure. In high and middle pressure cylinder oil temperature is higher, the gear the dust in the air, a mixture of lagging and the powder impurities of debris, carbide after rotor friction and extrusion, eventually forming hard solid carbide, are prone to touch the ground. 4, and measures to use gas seal oil gear to replace the traditional oil seal, problems to be fundamentally solved. （ Material source: in 2017, hubei, anhui, hebei, jiangsu, zhejiang province steam turbine technology exchange meeting paper)