Gas turbine power plant with flue gas recirculation and oxygen-depleted cooling gas
First Claim
1. A gas turbine power plant with flue gas recirculation, comprising:
- a gas turbine;
a heat recovery steam generator (HRSG);
a compressor intake through which an inlet flow will enter a compressor of the gas turbine; and
a flue gas splitter positioned downstream of the HRSG, the flue gas splitter configured to split flue gases into a first flue gas flow for recirculation into the inlet flow of the gas turbine and into a second flue gas flow for discharge to an environment,wherein the compressor intake is split into sectors connected with a flow passage of the compressor, the sectors comprising a first sector and a second sector, a feed for fresh air leading through the first sector of the compressor intake, and a feed for the first flue gas flow leading through the second sector of the compressor intake;
an intake baffle plate configured to divide the first sector and the second sector; and
wherein the first sector and the second sector of the compressor intake are constructed as concentric annuluses radially separated by the intake baffle plate at a connection of the compressor intake to the flow passage of the compressor to define coaxial flow paths for the intake flow received by the compressor intake.
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Accused Products
Abstract
A method is disclosed for operating a gas turbine power plant having a gas turbine, a heat recovery steam generator and an flue gas splitter which splits flue gases into a first flue gas flow for recirculation into an inlet flow of the gas turbine and into a second flue gas flow for discharge to an environment. An oxygen-depleted gas can be used in an open cooling system for cooling hot gas parts of the gas turbine. A split compressor intake can be provided for separate feed of recirculated flue gas and fresh air into a compressor intake. Compressor blades can include a separating band which blocks intermixing of recirculated flue gas and fresh air during compression.
14 Citations
10 Claims
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1. A gas turbine power plant with flue gas recirculation, comprising:
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a gas turbine; a heat recovery steam generator (HRSG); a compressor intake through which an inlet flow will enter a compressor of the gas turbine; and a flue gas splitter positioned downstream of the HRSG, the flue gas splitter configured to split flue gases into a first flue gas flow for recirculation into the inlet flow of the gas turbine and into a second flue gas flow for discharge to an environment, wherein the compressor intake is split into sectors connected with a flow passage of the compressor, the sectors comprising a first sector and a second sector, a feed for fresh air leading through the first sector of the compressor intake, and a feed for the first flue gas flow leading through the second sector of the compressor intake; an intake baffle plate configured to divide the first sector and the second sector; and wherein the first sector and the second sector of the compressor intake are constructed as concentric annuluses radially separated by the intake baffle plate at a connection of the compressor intake to the flow passage of the compressor to define coaxial flow paths for the intake flow received by the compressor intake. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A compressor blade, comprising:
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a single blade root configured to be connected to a rotor of a compressor or a casing of a compressor; a single blade airfoil for a gas turbine configured with flue gas recirculation, the blade airfoil configured to connect to the blade root to extend from the blade root; a single separating band segment attached to the blade airfoil and arranged between the blade root and a free end of the blade airfoil facing away from the blade root and forms a right angle to a longitudinal axis of the blade airfoil, the airfoil being constructed with the separating band segment such that the band segment extends radially having a first portion extending past a first side of the blade airfoil to a first free end and a second portion extending past a second side of the blade airfoil to a second free end, the second side of the blade airfoil being opposite the first side of the blade airfoil; wherein the separating band segment is configured to be positioned adjacent to separating band segments of other blades to be attached to a compressor stage such that, when the compressor blade is in an installed position, the separating band segment is positioned adjacent to the separating band segments of the other blades to form an essentially closed annular separating band which lies perpendicular to an axis of a gas turbine that is configured to block mixing of recirculated first flue gas flow with fresh air in a compressor; and wherein the compressor stage includes a stator blade having a second single separating band downstream from the blade root. - View Dependent Claims (9, 10)
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Specification