A method to optimize gas turbine igv control to improve the efficiency of gas-steam combined cycle

Abstract

The invention relates to a method for improving the fuel gas-steam combined cycle efficiency through optimizing gas turbine IGV control, and belongs to the technical field of gas turbine control. Themethod comprises the steps of when approximating to the annular average working condition, re-adjusting IGV control setting according to the actual operating parameter, and adjusting the gas turbine discharge temperature so as to enable the steam turbine main steam temperature to be controlled as a designed value; under the winter working condition, adding the deviation of IGV decrease, meanwhile,determining the operating parameter, and improving the operating efficiency of combined cycle under a partial load under the winter working condition; and under the summer working condition, adding the deviation of IGV increase, meanwhile, determining the operating parameter, and preventing the gas turbine from starting operating under the discharge temperature control in advance under the partial load. Through the method, the operating efficiency of combined cycle under the partial load can be improved in winter, so that the operating economy of a power station is improved; and the gas turbine can be prevented from starting temperature-control running in advance in summer, so that the load response speed of the gas turbine is improved, and the peak load regulation capacity of a unit is optimized.

Description

technical field [0001] The invention relates to a method for optimizing the IGV control of a gas turbine to improve the efficiency of a gas-steam combined cycle, in particular to a method for optimizing and controlling the IGV of a gas turbine to improve the partial load efficiency of a gas-steam combined cycle, which belongs to the technical field of gas turbine control. Background technique [0002] According to the IGV control logic, the IGV control process of the gas turbine during load operation is as follows: [0003] 1. When the gas turbine load is lower than 50% load, the IGV remains fully closed; [0004] 2. When the gas turbine load is greater than 50% of the load, the opening of the IGV gradually increases with the increase of the gas turbine load, [0005] When close to the rated load, the IGV is fully open; [0006] 3. After the IGV is fully opened, the load of the gas turbine continues to rise until the initial temperature of the turbine inlet reaches the lim...

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Problems solved by technology

[0009] However, in the actual production process, due to the aging of equipment due to unit processing deviation and long-term operation, the initial IGV opening setting curve and compressor inlet temperature correction coefficient may not match the actual situation, and cause the following problems:

[0010] 1. The exhaust gas temperature of the gas turbine exceeds the design value. Too high exhaust temperature will limit the load capacity of the gas turbine and the response speed to the AGC command of the power grid, or cause the temperature of the main steam of the turbine to rise, and the desuperheating water cannot control the temperature of the main steam , affecting the load capacity of the combined cycle unit;

[0011] 2. The exhaust temperature of the gas turbine is much lower than the design value, resulting in the temperature of the main steam of the turbine being significantly lower than the design value, and the efficiency of the unit is reduced, which affects the economy of the unit

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