Fuel heating in combined cycle turbomachinery

A turbomachinery, combined cycle technology, applied in the fuel heating of turbine/propulsion devices, turbine/propulsion fuel delivery systems, mechanical equipment, etc., can solve problems such as increasing the cost of fuel gas heating
CN103016157AInactive Publication Date: 2013-04-03GENERAL ELECTRIC CO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GENERAL ELECTRIC CO
Publication Date
2013-04-03
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for improving efficiency of a combined cycle turbomachinery. Combined cycle efficiency can be improved by heating fuel in a gas turbine fuel line in two stages using (i) hot water from an HP economizer of a heat recovery steam generator (HRSG) in a second stage and (ii) hot water from an IP economizer of the HRSG and water output flow from the second stage in a first stage. Efficiency may be further improved by adding one or more fuel preheaters using hot water from the IP feedpump and sequential injections of hot water into the fuel.
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Description

technical field

[0001] The present invention relates to combined cycle turbomachinery and, more particularly, to improving combined cycle efficiency by heating fuel in fuel lines entering gas turbines in stages. Background technique

[0002] Combined cycle turbomachines utilize a gas turbine (GT) as a prime mover to generate power. These GT engines operate on the principle of Brayton cycle thermodynamics and typically have high exhaust gas flow and relatively high exhaust gas temperature. When directed into a heat recovery boiler, typically called a heat recovery steam generator (HRSG), these exhaust gases produce steam that can be used to generate more power. The generated steam can be directed to a steam turbine (ST) to generate additional power. In this way, the GT performs work via the Brayton cycle, and the ST generates power via the Rankine cycle. Hence the name "combined cycle".

[0003] Fuel gas is typically heated in combined cycle turbomachines to increase ther...

Claims

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