28 September 2022

Turbine Start up | Start up Parameters | Start up and Operation Limit | Control values of steam parameters and metal temperature of turbine casing

Turbine Start up

Control values of steam parameters and metal temperature of turbine casing

a. Temperature rising rate of main steam should be less than 1.5 °C/min, temperature rising rate of reheat steam should be less than 2 °C/min.

b. Temperature difference between inner wall and outer wall of HIP outer casings and HP inner casing should all be less than 50 °C

c. Temperature difference between inner wall and outer wall of HP stop valve casing shall be less than 55 °C

d. Temperature difference between upper and lower half outer wall of HIP outer casing should be less than 50°C

e. Temperature difference between inner and outer wall of HIP outer casing flanges should be less than 80 °C

f. Temperature difference between left and right flanges on upper half outer wall of HP inner casing should be less than 35 °C

g. Temperature difference between upper half and lower half outer wall of HP inner casing should be less than 35 °C

h. Exhaust steam temperature of LP casing :

  Alarm value     80 °C (put in spray water)

  shut down value    120 °C

 

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