Under what circumstances should an emergency shutdown be initiated? ?
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Emergency shutdown should be initiated under the following conditions: (1) The vibration of any bearing in the turbo-generator set reaches the emergency shutdown value. (2) There are obvious sounds of metal friction and impact inside the steam turbine generator set. (3) Water hammer occurs in the turbine, or the temperatures of the main and reheat steam drop by 50°C within 10 minutes. (4) Oil supply to any bearing of the steam turbine generator set is interrupted, smoking occurs, or the oil return temperature of the bearing rises suddenly to the emergency shutdown value. (5) Sparks are coming from the shaft seal. (6) A fire breaks out in the turbine oil system and cannot be extinguished quickly, posing a serious threat to the safe operation of the unit. (7) The generator or exciter smokes, catches fire, or the hydrogen system explodes. (8) The turbine speed increased to the speed at which the emergency shutdown device should activate (3330 r/min), but the emergency shutdown device did not operate. (9) The metal temperature of any bearing in the turbine rises to the emergency shutdown value. (10) The lubricating oil pressure dropped to the emergency shutdown value, and starting the AC and DC lubricating oil pumps was ineffective. (11) The oil level in the main oil tank of the turbine dropped suddenly to the emergency shutdown level, and it could not be restored even after adding oil. (12) The axial displacement of the turbine reaches the emergency shutdown value. (13) The turbine expansion difference has reached the emergency shutdown value.
The unit has entered an uncontrollable abnormal state, and emergency measures have been unsuccessful!
The temperature of the last stage of the turbine continued to rise, until it reached 120 degrees at which point the turbine shut down automatically
Emergency shutdown should be initiated under the following conditions: (1) The vibration of any bearing in the turbo-generator set reaches the emergency shutdown value. (2) There are obvious sounds of metal friction and impact inside the steam turbine generator set. (3) Water hammer occurs in the turbine, or the temperatures of the main and reheat steam drop by 50°C within 10 minutes. (4) Oil supply to any bearing of the steam turbine generator set is interrupted, smoking occurs, or the oil return temperature of the bearing rises suddenly to the emergency shutdown value. (5) Sparks are coming from the shaft seal. (6) A fire breaks out in the turbine oil system and cannot be extinguished quickly, posing a serious threat to the safe operation of the unit. (7) The generator or exciter smokes, catches fire, or the hydrogen system explodes. (8) The turbine speed increased to the speed at which the emergency shutdown device should activate (3330 r/min), but the emergency shutdown device did not operate. (9) The metal temperature of any bearing in the turbine rises to the emergency shutdown value. (10) The lubricating oil pressure dropped to the emergency shutdown value, and starting the AC and DC lubricating oil pumps was ineffective. (11) The oil level in the main oil tank of the turbine dropped suddenly to the emergency shutdown level, and it could not be restored even after adding oil. (12) The axial displacement of the turbine reaches the emergency shutdown value. (13) The turbine expansion difference has reached the emergency shutdown value.