Fuel control system of gas turbine

Abstract

The invention provides a fuel control system of a gas turbine. The fuel control system mainly comprises a load determining unit and a fuel control unit. The load determining unit is used for determining load information of the gas turbine, and the fuel control unit is used for receiving the determined load information and controlling fuel nozzles of the gas turbine to be opened or closed selectively according to the received load information, so that the sum of rated flow of the opened fuel nozzles is matched with the determined load information. Regardless of a high-load condition or a low-load condition, the flow of each opened fuel nozzle can be lower than the rated flow of the opened fuel nozzle all along during working, so that the combustion efficiency of each fuel nozzle can keep the highest, and a total combustion system keeps the highest combustion efficiency basically.

Description

technical field

[0001] The invention relates to a gas turbine, in particular to a fuel control method of the gas turbine. Background technique

[0002] The fuel of the gas turbine is generally injected into the combustor through multiple fuel nozzles for combustion. At design time, each fuel nozzle has a set rated flow rate. This set flow is designed for the maximum allowable load of the engine. For these fuel nozzles, only when they operate at their rated flow rate can they achieve the maximum design combustion efficiency and effectively control emissions such as nitrogen oxides or carbon monoxide. However, when the gas turbine is working, there will always be some changing working conditions. In case of variable working conditions, for example, working under partial load, the current common practice is to throttle each fuel nozzle through a proportional valve. After throttling, the flow rate of the fuel nozzles becomes smaller, so that the sum of the fuel flows injecte...

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