Abstract:

1000MW ultrasupercritical turbine units generally adopt high pressure cylinder starting mode. During the startup of the turbine, the exhaust temperature of the high pressure cylinder is low, the reheat steam is cold, the pipe of the hot section is long , bearings at 2 ends of the medium pressure cylinder vibrate acutely, which results in the extension of startup time. By reforming adjacent boiler heating system, steam of adjacent boiler can directly get into the high pressure cylinder through the cold section pipe, which achieves the purpose of fully preheating the high pressure cylinder and uniformly heating the medium pressure cylinder. Therefore, the lifetime of the unit can be extended, the reheater can be protected, the starting time can be shortened, and the starting cost can be reduced.

Key words:

ultrasupercritical unit, adjacent boiler heating system, startup, preheat