Mitsubishi Heavy Industries Limited

Toshimitsu Morimoto

Satoshi Tanaka

Kozo Toyama

Shouichi Nagata

Toshiyuki Hashi

A gas turbine has a plurality of combustors in a toroidal arrangement to provide combustion gases to turbine blades, thereby rotating the turbine body. Thermocouples, the number of which is the same as or greater than the number of the combustors, are arranged toroidally at the outlets of the turbine blades and measure the temperatures of the combustion gases at the respective outlets. During the operation of the gas turbine, if an abnormality, such as misfire or fuel injection nozzle obstruction, occurs in one or more of the combustors, the resulting change in gas temperature triggers a signal to stop, and thereby protect the gas turbine. Based on the measured values of the blade pass temperatures of the thermocouples and set threshold temperatures, a fuel supply system may be caused to gradually decrease the fuel supplied to the combustors to bring the gas turbine body to an automatic stop, or it may be cut off instantaneously, thus immediately stopping the gas turbine.

Gas turbine protection device

A gas turbine load control device includes load setting means, first bias setting means, second bias setting means, target output setting means, and so forth. The target output setting means sets up a target output by adding a positive side bias value to a load set value when the load setting means gradually increases the load set value in response to an increase in a requested load set value inputted from requested load setting means. The target output setting means sets up the target output by subtracting a negative side bias value from the load set value when the load setting means gradually decreases the load set value in response to a decrease in the requested load set value.

Gas turbine load control device

A fuel gas heating control equipment in accordance with the present invention is provided with a gain-determining portionand a time-constant-determining portionwhich determine values of a gain and a time constant to be used for PI calculations being performed by a PI calculation portionThe gain-determining portionspecifies a small time constant for the PI calculation portionduring load fluctuations when the generator output increases, and specifies a large time constant for the PI calculation portionwhen the generator output reaches the maximum output. In consequence, during load fluctuations, responsiveness is good and a rapid change in temperature can be followed, so that a fuel gas temperature will not fluctuate in response to a slight change in temperature at the maximum output, thereby achieving a stable fuel gas temperature.

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Takasago, Japan

Toshimitsu Morimoto