A help post about steam turbine vacuum
Thread Content
My unit uses a Hangzhou Steam Turbine. Now both sets of air extractors have been turned on for vacuuming. The vacuum can be pumped down at that time. However, after a few days, the absolute pressure of the vacuum exhaust begins to rise, the temperature of the condensate also begins to rise, and the water seal also overflows. Is there anyone who knows this technology who can help me?
This means that the cooling effect of your air extractor has deteriorated. Check to see if the cooling water used in the air extractor has a filter. Clean it and see the effect! If the temperature cannot cool down, the vacuum level will naturally not cool down!
1. Check the size of the steam seal steam. It should be kept in a non-existent state and should not be too large, especially on the exhaust side. 2. During normal operation, the air extractor should be stopped and started and tested for leaks. 3. Check the temperature of the inlet and outlet water of the condenser to ensure that the discharge cylinder temperature is below 50, because during normal operation, the vacuum degree is determined by the discharge temperature.
There is no problem with the shaft seal and the circulating water temperature is normal, but the air extractor cannot judge
The circulating water does not have a filter, and now I am also suspecting that the cooling effect is poor and may be scaled. Are there any other considerations?
Use a small wooden stick to tap the drainage pipe gradually from the drainage outlet to the water inlet. I hope you can wash away the dirt! Remember to tap from the drain outlet to the water inlet, otherwise it may be counterproductive! , it is best to vent the drainage and observe the specific situation!
Is it possible that the leakage between turbine stages is too large?
Seal all static sealing points with Vaseline or grease!
After normal operation, the steam seal steam supply on the exhaust cylinder side should be turned off. The normal intake side leakage is sufficient for the exhaust side through the connecting pipe!
Keep the condensate level lower, control it below 60, and ensure that most of the tube bundles exceed the liquid level!