US 6,279,311 B1 · Combined cycle power plant

Abstract

A combined cycle power plant is provided that carries out mixing of steams heated to a high temperature by cooling a high temperature cooled part of a gas turbine. Other steam favorably, guarantees the safety of the alternating current apparatus, so that it is operated stably over a long period of time. The combined cycle power plant is equipped with a mixing tube that mixes exit steam from a steam cooling system and a bypass steam. The exit steam from the steam cooling system that has been heated by cooling the high temperature cooled part of this gas turbine and the bypass steam that is not introduced into, but bypasses, this high temperature cooled part in order to control flow volume and temperature of the steam introduced into the high temperature cooled part are introduced into the mixing tube and mixed. Thus a mixed superheated steam having uniform pressure and temperature is formed, and there is no deleterious effect on any downstream equipment.

Claims5

Dependent claims

A combined cycle power plant comprising:

a gas turbine;
a boiler connected to an exhaust heat line from the gas turbine, said boiler having a high-pressure steam generator, an intermediate-pressure steam generator and a low-pressure steam generator;
a mixing tube connected to an exit steam line from the gas turbine and also connected to a steam bypass line from the intermediate-pressure steam generator of the boiler;
and
a steam turbine plant having a high-pressure turbine connected by one steam line to the high-pressure steam generator of the boiler, an intermediate-pressure turbine connected to a superheated steam recovery line from the mixing tube, and a low-pressure turbine connected by another steam line to the low-pressure steam generator of the boiler.

2 more elements

A combined cycle power plant comprising:

a gas turbine;
a boiler connected to an exhaust heat line from the gas turbine, said boiler having a high-pressure steam generator, an intermediate-pressure steam generator and a low-pressure steam generator;
a steam turbine plant having a high pressure turbine connected by one steam line to the high-pressure steam generator of the boiler, an intermediate-pressure turbine connected to a superheated steam recovery line from a mixing tube, and a low-pressure turbine connected by another steam line to the low-pressure steam generator of the boiler;
a steam cooling system formed by a cooling steam supply system connected to an exit of the high-pressure turbine, a first steam cooling system for cooling a combustion chamber, and a second and a third steam cooling system for cooling a high-temperature cooled part of the gas turbine;
and
a bypass system formed by first, second and third bypass systems that are parallel to each cooling system for controlling flow volume and temperature of steam introduced to the first, second and third steam cooling systems;
wherein said mixing tube has a steam inlet on a tube end which communicates with said second and third steam cooling systems, and a plurality of steam inlets on a tube side for receiving a supply of bypass steam flowing through the bypass system;
and
further wherein said mixing tube mixes superheated outlet steam from the high-temperature cooled part of the gas turbine and bypass steam from the second and third bypass systems, and steam mixed by the mixing tube is recovered by the steam turbine plant downstream.

6 more elements

Dependencies are inferred from the claim text.

Combined cycle power plant

Life of this patent

Combined cycle power plant

Life of this patent

Abstract

Claims5