Steam turbine plant, control method of same, and control system of same

摘要

In one embodiment, a steam turbine plant includes a first turbine (3) driven by steam from a boiler (1), a second turbine (4) driven by steam from a reheater (2), a third turbine (5) driven by the steam exhausted from the second turbine (4), and a carbon dioxide capturing system (22) including a reboiler (106) to heat an absorbing liquid (111) with the steam exhausted or extracted from the second turbine (4). The plant further includes a steam pipe (11) to feed the steam exhausted from the second turbine (4) to the third turbine (5), and a first steam extraction pipe (21) to send the steam exhausted or extracted from the second turbine (4) to the reboiler (106). The plant further includes a pressure detector (13) to detect a pressure of the steam flowing through the steam pipe (11) or the first steam extraction pipe (21), a pressure adjustment valve (14) provided on the steam pipe (11), and a controller (15) to control the valve (14) based on the detected pressure. 13! 14FGi 3-----4-----_- 5 6 1 2 21 a 2 -1 -+ 22