Abstract: A steam turbine plant includes a chemical supply part configured to supply a pH adjuster to feedwater to a steam generator, an adjustment part for adjusting a supply amount of the pH adjuster to the feedwater by the chemical supply part, and at least one carbon steel component that includes a pipe or a device formed from carbon steel and through which the feedwater flows, the carbon steel component being configured such that an internal temperature at least partially falls within a range of not less than 120° C. and not greater than 180° C. under load operating condition of the steam turbine plant. The adjustment part is configured to, under the load operating condition, adjust the supply amount of the pH adjuster such that pH of the feedwater in each of the at least one carbon steel component is not less than 9.8.

Abstract: A solute concentration decision method for deciding a planned value CI of a concentration of a solute in a solution to be supplied to a first drum among one or more steam drums for temporarily containing steam generated in a boiler of a steam turbine plant includes a step of deciding the planned value CI of the concentration of the solute in the solution to be supplied to the first drum, on the basis of a target concentration of the solute in the solution in the first drum and a capacity coefficient of the solute in a drum unit including the first drum and an evaporator for generating steam contained in the first drum.

Abstract: A steam turbine plant includes a chemical supply part configured to supply a pH adjuster to feedwater to a steam generator, an adjustment part for adjusting a supply amount of the pH adjuster to the feedwater by the chemical supply part, and at least one carbon steel component that includes a pipe or a device formed from carbon steel and through which the feedwater flows, the carbon steel component being configured such that an internal temperature at least partially falls within a range of not less than 120° C. and not greater than 180° C. under load operating condition of the steam turbine plant. The adjustment part is configured to, under the load operating condition, adjust the supply amount of the pH adjuster such that pH of the feedwater in each of the at least one carbon steel component is not less than 9.8.

Abstract: Provided are a turbine facility, in which iron oxide particle scale that adheres to inner surfaces of boiler tubes and impedes heat transfer can be efficiently removed from heater drainage water; and a water treatment method for heater drainage water in the turbine facility. The turbine facility includes a boiler 9, steam turbines 12 and 16, a condenser 1, feedwater heaters 5 and 8 which are interposed in water supply lines 4 and 6 that supply condensate condensed by the condenser 1 to the boiler 9, and in which part of steam supplied from the steam turbine 12 to a repeater is extracted as extraction steam, and the feedwater is heated using the extraction steam, and a filtration device 19 in which heater drainage water discharged from the low-pressure feedwater heater 5 is filtered and supplied to the water supply system for recovery. The filtration device 19 includes a filter having a pore size of 1 to 5 ?m.