Rapid leak detection method for TCA cooler of gas turbine air cooling system

Abstract

The invention relates to a rapid leak detection method for a TCA cooler of a gas turbine air cooling system, and the method comprises the following steps of 1) operating a vacuum pump to obtain a condensed water oxygen dissolved amount DD1 at the outlet of a condenser, a condensed water dissolved oxygen amount DT1 at the outlet of the TCA cooler, and a vacuum degree VD1 of the condenser; 2) operating two vacuum pumps at the same time to obtain a condensed water oxygen dissolved amount DD2 at the outlet of the condenser, a condensed water dissolved oxygen amount DT2 at the outlet of the TCA cooler, and a vacuum degree VD2 of the condenser; 3) increasing or decreasing the load of the unit to obtain a condensed water oxygen dissolved amount DD3 at the outlet of the condenser, a condensed water dissolved oxygen amount DT3 at the outlet of the TCA cooler, and a vacuum degree VD3 of the condenser; and 4) quickly judging the leak position between the condenser and the TCA cooler when the vacuum degree of the condenser or the condensed water dissolved oxygen amount is higher than a set normal threshold, and further performing leak detection on 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). Such as 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 ...

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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