DRIVE SYSTEM OF BOILER FEED PUMP DRIVE TURBINE

摘要

To provide a drive system of a boiler feed pump drive turbine, in which steam can be extracted from the same extracting system in the entire operation range to the boiler feed pump drive turbine.SOLUTION: The drive system of a boiler feed pump drive turbine according to the embodiment is used in a steam turbine plant comprising: a high-pressure turbine; an intermedium-pressure turbine; a low-pressure turbine; a condenser; a boiler feed pump for increasing water pressure; and a boiler generating high-pressure steam from feed water. The boiler feed pump drive turbine drives the boiler feed pump for increasing pressure of feed water from the condenser using the steam supplied from the intermedium-pressure turbine via an extraction pipe. A butterfly valve is provided in a cross-over pipe for feeding the steam from the intermedium-pressure turbine to the low-pressure turbine and adjusts the steam pressure supplied to the boiler feed pump drive turbine by adjusting the amount of the steam supplied to the cross-over pipe.SELECTED DRAWING: Figure 1