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Precautions for Paralleling and on-Loading of Model C12-4.90/0.981 Steam Turbine in Cold Start

1.During load increasing, the operators shall keep an eye on each part of the unit, which shall be normal, especially the cylinder expansion variation, bearing temperature, axial displacement, the vibration frequency value of each part, the hot well water level and oil temperature and oil pressure etc., 

2.According to temperature, close the related water draining valve. After paralleling, when the temperature of generator rises to 40℃, the air cooler is put into use to keep the air temperature at 20℃-40℃.

3.Closely contact with the chemical water treatment persons to pay attention to whether the condensation water is qualified or not. If it is qualified, open the valve to the dearator, close the gate of condensation water- draining trench and keep normal hot well water level.

4.During on-loading, if the pressure of secondary-stage steam exhaust and third-stage exhaust is higher, the deaerator and low-pressure heater can be put into use(the low-pressure heater can be started/stopped along with the unit).

5.When the load is 3000kW,the first-stage exhaust (the adjustable exhaust) can be used for thermal-loading. 


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