Gas turbine assembly for power plant and method of maintaining gas turbine assembly

Abstract

A gas turbine for a power plant comprises at least one turbine provided with at least one row of stator vanes configured for guiding an hot gas flow, wherein each vane is outwardly connected to an outer casing and comprises an inner platform; a carrier inwardly arranged relative to the vane inner platform, a membrane seal extending from the carrier to the vane inner platform to isolate the lower-pressure hot gas from a volume below the vane inner platform, downstream the membrane seal that is fed by higher-pressure cooling air, wherein the membrane seal comprises an inner end housed in a groove in the carrier, an outer end housed in a groove in the vane inner platform, a membrane connecting the inner and outer ends, wherein the membrane is offset at the outer end towards the higher-pressure air volume, so that on the operating conditions, the upstream surface of the vane grooves do not contact the membrane.

Description

[0001] Cross References to Related Applications [0002] This patent application claims priority from European Patent Application No. 19209597.4 filed on November 15, 2019, the entire disclosure of which is hereby incorporated by reference. technical field [0003] The invention relates to the technical field of gas turbine assemblies for power plants. As is known, in a gas turbine assembly (or just a gas turbine) the incoming air stream is compressed and subsequently, ignited in the combustor with added fuel to create a hot stream which will be in the turbine expands to produce rotational work to the rotor, which in turn is connected to the generator. Due to the very high temperature of the working hot gas, some components of the gas turbine assembly must be cooled, and therefore, in addition to the main hot gas flow, a cooling flow (usually cooling air) also circulates inside the gas turbine. Additionally, some components of gas turbines are configured to allow some relati...

AI Technical Summary

Problems solved by technology

Furthermore, in this condition, the seal can vibrate, leading to increased wear and risk of seal damage

[0009] While the sealing issues above are described with respect to the combustor-turbine interface, the same issue applies to other locations located inside the gas turbine (where cooling air flow needs to be separated from hot gas flow, and where, depending on operating conditions, some parts relative to the rest of the movement) affect the

Images