Steam supply system and steam supply method

Abstract

A steam supply method involves a COrecovery device, a first line through which low-pressure steam is extracted from a low-pressure line for supply of the low-pressure steam to a steam turbine and to the COrecovery device, and a second line through which medium-pressure steam is extracted from a medium-pressure line for supply of the medium-pressure steam to the first line. A low-pressure steam governing valve is provided upstream of a connection position of the low-pressure line with the first line. A medium-pressure steam governing valve of the medium-pressure line, and a steam backup valve of the second line are provided. The method includes closing the low-pressure steam governing valve and the medium-pressure steam governing valve and opening the steam backup valve based on a state of operation of the power plant.