A THERMAL POWER PLANT FOR RECOVERING WATER FROM EXHAUST GAS AND A METHOD FOR TREATING RECOVERED WATER OF THERMAL POWER PLANT THEREOF

摘要

A thermal power plant for recovering water from exhaust gas (13) comprising: a gas turbine (1); a heat recovery steam generator (26) for generating steam by supplying exhaust combustion gas exhausted from the gas turbine (1) as heat source; a water recovery system (17) installed on the downstream side of the heat recovery steam generator (26) for condensing and recovering water in the exhaust combustion gas through direct gas/liquid contact between the exhaust combustion gas coming down from the heat recovery steam generator (26) and water; a recovered water system for supplying a part of the water recovered by the water recovery system (17), thereby allowing the water to be circulating as circulating water; a feed water system for supplying the heat recovery steam generator (26) with other part of the water recovered by the water recovery system (17) as feed water; a first pH adjusting system installed in the recovered water system to adjust the circulating water flowing through the recovered water system to a first pH value (hydrogen ion concentration index); a second pH adjusting system installed on the feed water system to adjust the feed water flowing through the feed water system to a second pH value (hydrogen ion concentration index); and a control system for controlling the volumes of the pH adjusters supplied from the first pH adjusting system and the second pH adjusting system.