Hitachi, Ltd.

Takeshi Iwamiya

Hiraku Ikeda

Akira Shimura

Nobuyuki Iizuka

Isao Sato

Osamu Arai

Fumiyuki Hirose

Haruo Urushidani

Kazuhiko Kumata

Yasutaka Komatsu

Yasuhiko Otawara

Minoru Takaba

Seisaku Takihana

Sadao Yanada

Naohiko Iwata

Tadahiko Iijima

Takeshi Ishida

Takumi Kawai

Yukiyoshi Tani

A gas turbine apparatus has a gas turbine and a plurality of burners for providing combustion gas to drive the turbine. A flow control means of each burner for fuel or combustion air is adjusted by control means to control each said burner individually in dependence on a predetermined combustion characteristic of the respective burner. Sensed quantities relating to the combustion performance of the burners are input to the control means which adjusts the flow control means of each burner in dependence on the sensed quantities and the predetermined combustion characteristic of the respective burner.

Gas turbine apparatus and method of control thereof

To provide a combustion apparatus and a controlling method therefor which are capable of preventing the flame-out and backfire of the flame of a premix burner and the increase of the NOx concentration attributable to the change of the calorific value of the fuel, the amount of air supplied to the premix burner is so controlled as to achieve a low NOx within the range in which the premix burner effects a stable combustion in accordance with the calorie of the fuel supplied to the combustion apparatus, and a change of the output of the combustion apparatus attributable to this control of the amount of air is compensated by the control of the amount of the fuel supplied to the diffusion burner.

Combustion apparatus and control method therefor

A method of and apparatus for controlling a triple-coil servo valve arranged having a tripled control system each of which is composed of components of a coil, a servo amplifier and a controller, the method of and the apparatus for controlling the triple servo valve including means for specifying the abnormality of each of the components, servo amplifier output separation means, means capable of desirably combining the components and means for compensating the servo amplifier. If two control systems of the tripled control system are faulty in such a manner that at least one coil, at least one servo amplifier or at least one controller is abnormal, the triple-coil servo is operated by combining the normal components or by compensating the servo amplifier so that the continuation of the operation of the plant is enabled. Although the operation of the plant employing the conventional structure is shut down if two systems of the tripled control system, each of which is composed of the coil, the servo amplifier and the controller, are abnormal, the continuation of the operation can be enabled according to the present invention while preventing a disturbance of the plant even if the two or the three systems are abnormal by combining normal components and by separating the output from the servo amplifier in a case where the servo amplifier is abnormal.

Servo valve control apparatus

Growing community of inventors

Katsuta, Japan

Takeshi Iwamiya