Gas turbine, combined cycle plant, and method of starting a gas turbine

Abstract

According to the start-up method of the gas turbine, the combined cycle unit and the gas turbine of the present invention, by setting: an air cooler (31), which performs heat exchange with the compressed air extracted from the compressor (21) and supplies the cooled compressed air To the cooling system of the rotor system of the turbine (23); the air cooler bypass line (34), which bypasses the compressed air introduced into the air cooler (31); the electric valve (35), which is arranged at the air cooler On the bypass pipeline (34); and the control part (101), which controls the opening and closing of the electric valve (35), so that the valve opening of the electric valve (35) is a low level opening during the start-up process of the gas turbine (20). When the load of the gas turbine (20) rises, the valve opening of the electric valve (35) is larger than the low level opening, so that the distance between the turbine cylinder side and the rotor blade is set to an appropriate amount, and the safety can be realized. Ensuring and performance improvements.

Description

technical field [0001] For example, the present invention relates to a gas turbine that supplies fuel to compressed high-temperature, high-pressure air and burns it, and supplies the generated combustion gas to a turbine to obtain rotational power, a combined cycle unit to which the gas turbine is applied, and the gas turbine start method. Background technique [0002] A typical gas turbine consists of a compressor, a combustor and a turbine. The compressor generates high-temperature, high-pressure compressed air by compressing the air sucked in from the intake port. The combustor supplies fuel to the compressed air and burns it to obtain high-temperature, high-pressure combustion gas. The turbine is driven by the combustion gas, and drives a coaxially connected generator. [0003] The turbine mechanism of this gas turbine is such that a plurality of stationary vanes and moving vanes are alternately arranged in the cylinder along the flow direction of the combustion gas, ...

AI Technical Summary

Problems solved by technology

In this case, there is a problem that when the distance between the tip of the turbine blade and the inner peripheral surface of the turbine block is set according to the distance when the gas turbine is started, the distance is enlarged when the gas turbine is operated in a steady state. to more than demanded and leads to a reduction in the recovery efficiency of the driving force generated by the turbine and a reduction in the performance of the gas turbine itself

Images