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We have a steam turbine driving a nitrogen compressor. The problem is that the turbine is tripping on overspeed protection upon load rejection.
As the consumer stop suddenly their demand, the speed of the steam turbine is decreasing so the governing valve is opening to increase the speed, and at the same time the recycle valve of the compressor is opening. when the recycle valve open completely, then the governing will start to close to reduce the speed. but the problem the speed increase is very fast and the turbine is tripping.
Any advice to solve this problem?
Also what will be system response in case of actual surge of the compressor?
Also please, Is it normal to have overspeed trip on only 103%?
Who should decide the setting, the steam turbine vendor or compressor vendor?
As the consumer stop suddenly their demand, the speed of the steam turbine is decreasing so the governing valve is opening to increase the speed, and at the same time the recycle valve of the compressor is opening. when the recycle valve open completely, then the governing will start to close to reduce the speed. but the problem the speed increase is very fast and the turbine is tripping.
Any advice to solve this problem?
Also what will be system response in case of actual surge of the compressor?
Also please, Is it normal to have overspeed trip on only 103%?
Who should decide the setting, the steam turbine vendor or compressor vendor?