A method for quick leak detection of TCA cooler in gas turbine air cooling system

Abstract

The invention relates to a method for quickly checking for leaks in a gas turbine air cooling system TCA cooler, comprising: 1) running a vacuum pump to obtain the condensed water dissolved oxygen amount DD1 at the outlet of the condenser, the condensed water dissolved oxygen amount DT1 at the outlet of the TCA cooler, and the condensed water dissolved oxygen amount DT1 at the outlet of the condenser; Condenser vacuum VD1; 2) Two vacuum pumps run at the same time to obtain condensate dissolved oxygen DD2 at the outlet of the condenser, condensate dissolved oxygen DT2 at the outlet of the TCA cooler, and condenser vacuum VD2; 3) Increase or decrease the unit Load, obtain the condensed water dissolved oxygen amount DD3 at the condenser outlet, the condensed water dissolved oxygen amount DT3 at the TCA cooler outlet, and the condenser system vacuum degree VD3; 4) When the condenser vacuum degree or condensed water dissolved oxygen amount is higher than the set value When setting the normal threshold, quickly judge the leakage position between the condenser and the TCA cooler, and further check the leak of the TCA cooler.

Description

technical field [0001] The invention relates to the technical field of gas turbine monitoring, in particular to a method for quickly checking for leaks in a TCA cooler of a gas turbine air cooling system in an M701S(F) type gas-steam combined cycle power generation system and screening for causes of vacuum drop in a condenser. Background technique [0002] In the M701S(F) gas-steam combined cycle power generation system produced by Japan's Mitsubishi Corporation, the turbine rotor of gas turbine 1 is cooled by a turbine cooling air system (TCA system). like figure 1 As shown, the cooling air is extracted from the outlet of the air compressor, and enters the turbine rotor of the gas turbine after being cooled by the TCA cooler 7 . The cooling water of the TCA cooler 7 is taken from the water supply system of the waste heat boiler. The condensed water in the condenser 2 is used to lower the temperature of the cooling air. The condensed water is pumped out by the condensed wat...

AI Technical Summary

Problems solved by technology

Leakage of the TCA cooler can lead to a decrease in the vacuum of the condenser and an increase in the dissolved oxygen in the condensed water at the outlet of the condenser, but this cannot be regarded as the inevitable result of judging the leakage of the TCA cooler

Because the leakage of the condenser system will also have such consequences, and the leak detection work of the condenser vacuum system is more cumbersome and more difficult

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