Purging air supply system for a gas turbine
AssigneeMitsubishi Heavy Industries, Ltd.
InventorYukimasa Nakamoto
Life of this patent
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Abstract
A plurality of fuel nozzles X1 and X2 in combustor X are supplied with fuel gas from a fuel gas system and fuel oil from a fuel oil system, respectively. Gas turbine operation is performed with fuel being changed over to either gas or oil. Fuel oil distribution control system A controls oil flowing into a plurality of fuel pipings. When oil is changed over to gas, fuel oil purge system B is supplied with air of an appropriate temperature and pressure from purging air supply system C. This air flows into fuel oil pipings and nozzles X2 for purging residual oil therein. Fuel nozzle wash system D is supplied with water by-passing from a wash water tank for compressor washing. This water flows through nozzles X2 for washing thereof.
Claims11
A purging air supply system comprising:
- a first cooler that cools air from a rotor of a gas turbine, said first cooler comprising a first inlet and a first outlet, said first inlet being in communication with the rotor so as to receive air from the rotor, said first outlet being in communication with the rotor so as to outlet a first portion of cooled air to the rotor;
- a second cooler that further cools a second portion of the cooled air from said first cooler, said second cooler comprising a second inlet and a second outlet, said second inlet being in communication with said first outlet so as to receive the second portion of the cooled air from said first cooler;
- and
- a pressure elevation compressor that increases pressure of further cooled air from said second cooler, said pressure elevation compressor comprising a third inlet and a third outlet, said third inlet being in communication with said second outlet so as to receive the further cooled air from said second cooler, said third outlet being in communication with a fuel nozzle of the gas turbine so as to supply air at an increased pressure to the fuel nozzle.
Dependencies are inferred from the claim text.