Water has entered the turbine
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I would like to ask the experts here: If, during the barring process of a turbine, water gets into the turbine cylinder due to operational errors, which in turn causes the main shaft to bend (preventing the turbine from rotating), what should be done in such a situation? What are the consequences of such accidents, and what potential hazards do they pose? Thank you all for your advice! ! ! This post was last edited by qiulin810808 on 2007-12-27 07:22.]
Will the material of the cylinder block and rotor change?
This is caused by water entering the cylinder, which leads to a sharp drop in the rotor’s temperature. The resulting thermal stress exceeds the material’s yield limit; even after the temperature returns to normal, the rotor cannot return to its original shape, resulting in permanent or plastic deformation. High-pressure, large-scale units have strict requirements regarding the degree of thermal bending of the rotor – under normal conditions, this value should not exceed 0.03–0.04 mm. When the rotor bends due to heat, its center of gravity shifts away from the center of rotation, generating significant centrifugal forces that cause severe vibration in the unit. Remedial actions include performing dynamic balancing on the rotor, sending it back to the factory for repair, or replacing it
Thank you, brother upstairs! So what should we do now? Wait until the temperature drops before trying to turn the engine over? If it’s possible to turn the engine over, then there shouldn’t be any major problems, right?
Guys, are there any other opinions? Please give me your advice!!!
No, it still needs to go through dynamic balancing. If that doesn’t work, it will have to be sent back to the factory for further processing. Even if it can be rotated after cooling down, there’s no guarantee that it will function properly when started again. Open it up for inspection! :(
Did you turn the wheel of yours right after stopping? What kind of water is being introduced? Cold water? Hot water? 1. If the large shaft deforms and the machine cannot be rotated due to the rapid drop in temperature caused by water ingress, then the degree of deformation will be quite significant. Are there any other reasons? 2. It can be rotated when cooled down, but there’s no guarantee that it will work properly when started again; open it for inspection!
After cooling down, it was possible to rotate it, and after disconnecting it from the compressor, it was spun up at 1100 revolutions per minute – with no problems occurring. However, when the speed exceeded the critical level, vibrations became excessive and the machine stopped working. It’s currently being cooled again, in anticipation of another attempt!!!~~~ Thank you all for your advice; feel free to suggest more solutions!!!