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On the process of unit start, how to deal with poor big differential expansion?

on the process of unit start, differential expansion is too large, the driver should do the following work:

⑴ check if the main steam temperature is too high, contact the boiler operating personnel, appropriate lower steam temperature.

⑵ the unit in a stable speed and stability under a load of warm-up.

⑶ appropriate increase in condenser vacuum, reducing steam flow.

⑷increase the cylinder and the flange heater steam amount with, the rapid expansion of the cylinder