Kabushiki Kaisha Toshiba

Toshiba Engineering Co.

Other

Haruo Oguchi

Shirou Hino

Toshie Kataoka

Akira Hasegawa

Masayuki Tobo

Toyohiro Akebi

Takahiro Moribe

Hajime Yasui

Takeshi Koi

A power generation plant comprises a plant control device () including two switchable control modes, i.e., a gas-turbine load control mode () and a steam-turbine load control mode (). When the control is performed with the gas-turbine load control mode (), a fuel valve () is controlled based on a load of a whole generator set (), and a steam regulating valve () is controlled based on an exhaust pressure of a steam turbine (). When the control is performed with the steam-turbine load control mode (), the fuel valve () is controlled such that a valve opening degree thereof is maintained constant, and the steam regulating valve () is controlled based on a load of the whole generator set ().

Power generation plant and control method thereof

A gas turbine system comprises an alarm signal calculation circuit, a shutdown calculation circuit and a flashback-error signal prevention calculation circuit. The alarm signal calculation circuit, the shutdown calculation circuit and the flashback-error signal prevention calculation circuit are integrated in a combustion monitoring device for monitoring combustion condition of combustion gas in a gas turbine-combustor.

Gas turbine system

A power generation plant possessing a gas turbine includes a nitrogen oxide removal apparatus for injecting a reducing material such as ammonia into exhaust gas from the gas turbine to reduce NOx emission under a predetermined level. To a feedback control system for estimating such an amount of the reducing material to be injected that a measured NOx amount at an outlet of the nitrogen oxide removal apparatus will get toward a NOx setpoint there is added a feedback control system for estimating an injection amount of the reducing material required for a NOx flow rate at an inlet of the nitrogen oxide removal apparatus based upon a mole ratio of the reducing material to the NOx. The measured NOx at the inlet of the nitrogen oxide removal apparatus is corrected based upon the combustion conditions of the gas turbine unit. NOx setpoint and the mole ratio are estimated based upon the operating conditions of a plant related to nitrogen oxide removal efficiency. Even in the plant state where variations of NOx production are severe, NOx and the reducing material exhausted into the atmosphere are maintained at an acceptable level.

Nitrogen oxide removal control apparatus

Growing community of inventors

Yokohama, Japan

Haruo Oguchi