US 11,834,969 B2
Steam turbine plant and control device, and water quality management method for steam turbine plant
Akihiro Hamasaki, Yokohama (JP); Haruka Kido, Yokohama (JP); Mitsuru Nakamoto, Yokohama (JP); and Senichi Tsubakizaki, Yokohama (JP)
Assigned to MITSUBISHI POWER, LTD., Kanagawa (JP)
Appl. No. 17/630,237
Filed by Mitsubishi Power, Ltd., Kanagawa (JP)
PCT Filed Sep. 25, 2020, PCT No. PCT/JP2020/036245
§ 371(c)(1), (2) Date Jan. 26, 2022,
PCT Pub. No. WO2021/060457, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 2019-174104 (JP), filed on Sep. 25, 2019.
Prior Publication US 2022/0282639 A1, Sep. 8, 2022
Int. Cl. F01K 9/00 (2006.01); C02F 1/66 (2023.01); F01D 25/00 (2006.01); F22B 37/56 (2006.01); F22D 11/00 (2006.01)
CPC F01K 9/00 (2013.01) [C02F 1/66 (2013.01); F01D 25/00 (2013.01); F22B 37/56 (2013.01); F22D 11/006 (2013.01); F05D 2220/31 (2013.01); F05D 2260/60 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A steam turbine plant, comprising:
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 which 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 a load operating condition of the steam turbine plant,
wherein 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,
wherein the pH adjuster includes ammonia,
wherein the steam turbine plant comprises one or more steam drums for temporarily accommodating steam generated by a boiler serving as the steam generator,
wherein the one or more steam drums include:
a first drum supplied with the feedwater from a condenser and having a lowest internal pressure among the one or more steam drums; and
a second drum supplied with the feedwater from the condenser not via the first drum and having a higher internal pressure than the first drum,
wherein the at least one carbon steel component includes the first drum, and
wherein 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 to be supplied to the first drum is not less than 10.1.