How to vent the condensate pump of a condensing steam turbine?
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There is cavitation noise in the condensate pump, and the outlet pressure fluctuates. Dear experts, how can I achieve good exhaust ventilation?
The inlet should be equipped with a vent valve, which should remain open at all times
The exhaust valve remains constantly open, so it is impossible for the temperature of the condensed medium to drop
The exhaust side of the turbine is at a certain level of vacuum, and the inlet pressure of the condensate pump should be below atmospheric pressure. The presence of gas you mentioned may be due to the existence of non-condensable gases between the outlet of the condenser and the inlet of the pump; this situation occurs after pump maintenance. If the balance valve of the pump is not opened, the phenomenon you described will occur. This is just a speculation. The condensation temperature of the condensate is related to the vacuum level and generally does not decrease.
I am aware of the situation you are talking about. It is also possible that there is air leakage from the packing seal of the condensate pump, among other things. Both pumps are started simultaneously; one is operating normally while the other has normal outlet pressure, though there is an erosion noise. After shutting down the normal unit, the pump that was making cavitation noises became unstable again.