Vibration problems of turbines
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The turbines in our factory experience significant vibration changes when the load is altered. There’s a strange phenomenon: when water is poured on the base, the vibration level drops by about 10 um – it’s really odd Last edited by Drifting in the north on 2008-12-12 17:35]
The original poster didn’t specify whether it’s rotor vibration or airframe vibration :L
The turbine has bearings at both ends; the high-pressure end typically has thrust and radial bearings. Are these bearings separate or integrated? The low-pressure end has only a radial bearing. It’s likely that the vibration value you mentioned refers to the vibration of the radial bearing on the high-pressure side. The temperature at the front of the turbine is very high, slightly lower than the temperature of the steam used. Don’t you use water for cooling? We use water to cool from both sides, and what comes out is gas. Clearly, this is due to an increase in bearing temperature caused by increased load. Additionally, when more steam is supplied, there is also more thermal radiation from the base to the bearing housing. You must have temperature monitors for the bearings; have you been checking the bearing temperatures? As for why high temperatures lead to higher vibrations, I think it’s related to the relative thermal expansion of the bearings and rotor, as well as the effect of temperature on the shape and pressure of the oil film. I’m not sure if that’s correct.
Isn’t there circulating cooling water inside the base that the original poster is talking about? Could it be that the pipeline is blocked? I wonder whether the vibration levels on your machines increase at all four points simultaneously, or only at the bearings on the turbine side ? ? There is still a section of exposed gap between the front bearing of the turbine and the front shaft seal of the turbine. Moreover, the front base of Hangzhou turbines generally does not have water-cooled support blocks, whereas those of Jinxi turbines do. However, even in Jinxi, the support blocks of the turbines are still quite far from the bearing seats of the rotors; there is air in between, resulting in a significant temperature difference. Is it possible that the uneven distribution of the steam inlet is to blame? This is related to the installation of the inlet and extraction steam control valves of the turbine, as well as the matching with the governor. The above are merely guesses; let’s wait for the correct answer! ! ! Also: I wonder if, when the vibration amplitude fluctuates, other parameters of the rotor such as displacement and shaft temperature do not fluctuate as well?
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