What are the causes of low vacuum in steam turbines?
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When the gas compressor turbine was just started up, the vacuum level was at -80; once the load was fully applied, the vacuum level dropped to around -60, remaining unstable with constant fluctuations. As the cycle water temperature rises, the high vacuum level drops a bit as well. Flushing the water side of the condenser yields little effect. I also checked for any gaps. The ejector is also operating normally. Currently, the temperature between each section of the gas four-stage water cooler is also on the high side. The temperature of the circulating water is controlled at around 16°C. I would appreciate any advice from everyone. If in doubt, it’s possible that there are still some issues that haven’t been identified; good suggestions on how to check for them while the system is running would also be helpful.
Issues such as problems with the extractor nozzle, proper drainage of condensate water from the extractor, the proper functioning of the steam trap, leaks in the vacuum system, and whether grease has been applied to the sealing surfaces can all have an impact
Based on your description, I think it’s due to poor heat exchange efficiency of the condenser. You can check what the temperature difference of the circulating water at the inlet and outlet is Is it consistent with the design? Also, what level do you control for the hot well fluid?