Issues with the turbine?
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What are the reasons for the excessively high speed increase of the unit after the steam turbine loses load? Please, experts, discuss this!
The magnitude of load shedding should not be too large; do not suddenly reduce the load significantly, but instead lower it gradually over time. Before load shedding, the valve opening corresponds to a high load, resulting in a larger opening. When there is a sudden and significant load reduction, the control system does not have time to adjust the valve opening, which inevitably leads to a sharp increase in speed.
The load drop was too large; the speed control mechanism did not have time to react, causing the speed to soar.
As mentioned above, the load drop was too large; the speed control mechanism did not have time to react, causing the speed to soar. Also, vacuum level and load are related to each other; when the load decreases, if the vacuum level does not decrease correspondingly, it may also lead to an increase in rotational speed.
The load drop is too large; the correct corrective measure is to reduce the rotational speed, open the return valve, and adjust the outlet pressure to its normal value. Otherwise, surge is likely to occur, damaging the compressor.