Turbine seal steam control system
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This post was last edited by yxmqh on 2009-10-10 at 14:52. Our plant has started up two steam turbines; I would like to ask about the principle of the steam sealing control system for these turbines – I still don’t understand it
The steam coming from the turbine enters the condenser shell (the steam side) via the exhaust nozzle and the throat of the condenser. There, the steam comes into contact with the condensing tube bundle and begins to condense. As steam, which has a large volume, is converted into condensed water of much smaller volume, a vacuum is created in the condenser. The latent heat released during steam condensation is transferred to the cooling water through the tube walls; the inlet cooling water passes through the tube bundle, absorbing this latent heat, which causes the temperature of the outlet water to rise. The condensate formed after steam condenses is drawn out from the condensate outlet by a condensate pump. Air that enters the space on the steam side of the turbine condenser through gaps in the under-negative-pressure condenser and pipelines is continuously removed by an extraction pump via the extraction ports, in order to maintain the vacuum in the condenser and ensure efficient heat transfer.