Operation method for combined circular electricity generator

Abstract

A combined cycle power generation plant generally comprises a gas turbine plant, a steam turbine plant and an exhaust heat recovery boiler, which further includes a low temperature reheat steam system for supplying a turbine exhaust steam from a high pressure turbine of the steam turbine plant to a reheater of the exhaust heat recovery boiler, a cooling steam supply system which branches from the low temperature reheat steam system and supplies the turbine exhaust steam to the high temperature section as a cooling steam, an intermediate pressure superheater steam system which is connected to the cooling steam supply system and adapted to join a steam supplied from an intermediate pressure superheater of the exhaust heat recovery boiler together with the turbine exhaust steam, a reheat steam system connecting the reheater of the exhaust heat recovery boiler and the intermediate pressure turbine, a cooling steam recovery system which recovers a steam after cooling the gas turbine high temperature section to the reheat steam system, a bypass system which branches a superheat steam pipe connecting an outlet of a first high pressure superheater of the exhaust heat recovery boiler and an inlet of a second high pressure superheater thereof, and a main steam system which supplies a steam from the bypass system to the high pressure turbine.

Description

[0001] This case is a divisional application of a patent application titled "Combined cycle power generation device and its operating method", with the filing date of "August 26, 1998" and the application number of "98118532.0". (1) Technical field [0002] The invention relates to a method of operating a combined cycle power plant which uses steam as a cooling medium to cool a high temperature section of a gas turbine plant. 2) Background technology [0003] In recent thermal discharge devices, in order to improve the thermal efficiency of the devices, many combined cycle power generation devices have been adopted as practical equipment (device for practical use), each of which is composed of a gas turbine device, a steam turbine device and a waste heat recovery boiler. composition. In the combined cycle power plant, there are provided a so-called single-shaft type that makes full use of one plant operation and a so-called multi-shaft type that makes full use of the rated o...

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