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High pressure (HP) and Low pressure (LP) bypass systems are used for quick start-up of the unit as well as during trip-out, where load rejection at the turbine does not automatically lead to a boiler trip. With a bypass system, start-up is quicker. The system diverts the steam generated by the boiler to the Re-heater/Condenser, at the same time reducing the pressure and temperature of steam, thus maintaining a minimum circulation of steam through the boiler. This enables running the boiler without the turbine in service, ensuring flow through re-heater coils.
HP-LP bypass system has the following advantages :-
1.The prolonged venting of safety valves to atmosphere is avoided, thereby reducing DM water loss and cutting noise emission.
2.Sustained flow through the boiler heating surfaces is assured, ensuring Re-heater protection during start-up of units.
3.If the grid cannot accept power, the unit can be kept running on house load.
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