I have a few questions about back-pressure steam turbines for the experts here
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The first question is: at what point should the backpressure steam be connected – after reaching critical operation stability, or should the turbine exhaust steam be connected to the grid before reaching critical conditions? The second question is: when should the steam seal extractor be activated and when should it be turned off, and what level of negative pressure is appropriate? The third question is: when shutting down the turbine, is it possible to reduce its speed below critical levels before stopping it by removing the load? In our plant, we used to shut down the turbine directly above critical conditions
Which manufacturer makes your turbines? Different manufacturers have different turbines, as well as different methods for equalizing pressure and installing shaft seals.
Most of the turbines these days should be from Hangzhou Zhongneng, right? We generally slowly turn off the venting after crossing critical stability, start pumping air before starting up the equipment, and turn off the pumping air after stopping the steam supply! We also shot them to death after they dropped to a certain level
Same as above, negative pressure value: 40 KPA