Gas turbine output learning circuit and combustion control device for gas turbine

Abstract

A gas turbine output learning circuit is configured to compute a current combustion gas temperature TIT at an inlet of a gas turbine by linear interpolation by use of two characteristic curves A and B respectively representing relations between a pressure ratio and an exhaust gas temperature in the cases of the combustion gas temperature at the inlet of the gas turbine at 1400° C. and 1500° C., then to compute ideal MW corresponding to this combustion gas temperature TIT at the inlet of the gas turbine by linear interpolation according to 1400° C.MW and 1500° C.MW (temperature controlled MW), and then to correct the 1400° C.MW and the 1500° C.MW so as to match the ideal MW with a measured gas turbine output (a power generator output).

Description

technical field [0001] The invention relates to a gas turbine output teaching circuit and a combustion control device of the gas turbine with the circuit. Background technique [0002] In a gas turbine having a gas turbine main body, a combustor, a compressor provided with an inlet guide vane (Inlet Guide Vane: IGV), and a fuel flow control valve for adjusting the fuel supply amount supplied to the fuel nozzle of the combustor, equipped with A gas turbine combustion control device that controls the fuel supply amount supplied to the fuel nozzle by the opening degree of the fuel flow regulating valve, an IGV control device that controls the opening degree of the IGV, and the like. [0003] The combustion control device of the above-mentioned gas turbine is described in detail below. In the following patent document 1, a combustion control device of a gas turbine is proposed, which can calculate the gas load command value (CLCSO) proportional to the combustion gas temperature ...

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Problems solved by technology

[0008] However, the gas turbine output teaching circuit described in Patent Document 1 starts teaching after judging that the combustion gas temperature at the inlet of the gas turbine has reached the maximum combustion gas temperature, that is, after judging that the gas turbine output has reached the rated output (rated load). Problems may arise in the case of gas turbines that are often operated at partial load, such as by order from the power supply center.

[0009] That is, in a combustion control device of a gas turbine that is often operated at a temperature lower than the maximum combustion gas temperature (partial load) without making the gas turbine inlet combustion gas temperature reach the maximum combustion gas temperature, when the above-mentioned When the gas turbine outputs the teach circuit, it is possible that the teach never starts and the correction of the thermoregulation MW is not done

Moreover, the temperature-adjusted MW is used for the calculation of CLCSO. Due to the performance degradation of the gas turbine, the output of the gas turbine (generator output) decreases. Combustion control of CLCSO may cause combustion vibration, etc.

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