Mitsubishi Hitachi Power Systems, Ltd.

Mitsubishi Power, Ltd.

Akihiro Hamasaki

Haruka Kido

Mayumi Saito

Toru Tanaka

Yoshiyuki Hamaji

Masanori Fujioka

Mitsuru Nakamoto

Senichi Tsubakizaki

Atsushi Sugimoto

Takashi Michino

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&#xb0; C. and not greater than 180&#xb0; 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.

Steam turbine plant and control device, and water quality management method for steam turbine plant

A water quality management device is provided with a water quality index value acquisition unit which acquires water quality index values including a makeup water quality index value indicating water quality of makeup water and a circulating water quality index value indicating water quality of circulating water, and a determining unit which determines an amount of concentration control associated with a concentration rate of a circulating water system based on the water quality index values acquired by the water quality index value acquisition unit.

Water quality management device, water treatment system, water quality management method, and program for optimizing water treatment system

An injection device for injecting injection fluid (chemicals) into piping through which fluid flows, the injection device comprising: an injection line through which the injection fluid flows, the injection line being connected to the piping; an injection pump disposed on the injection line; an extrusion line connected downstream of the injection pump and upstream of a target portion for air removal on the injection line; and an extrusion pump for feeding extrusion fluid to the extrusion line, wherein a discharge capacity of the extrusion pump is greater than a discharge capacity of the injection pump.

Injection device and steam turbine system

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Yokohama, Japan

Akihiro Hamasaki