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GAS FUEL DEW POINT HEATING UTILIZING GAS TURBINE EXHAUST

IP.com Disclosure Number: IPCOM000238550D
Publication Date: 2014-Sep-03
Document File: 3 page(s) / 183K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention proposes a technique that utilizes heat from exhaust gas to heat fuel and improves overall efficiency of the gas turbine engine. The technique includes a heat exchanger in a gas turbine exhaust stream which is utilized to heat a secondary fluid. The secondary fluid is further utilized within the gas turbine plant to pre-heat natural gas above hydrocarbon dew point as the fuel flows to the gas turbine. The invention also includes a second exhaust gas to fuel gas heat exchanger. The exhaust gas temperature supplied to a second heat exchanger is reduced below an auto-ignition temperature of the fuel gas.

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GAS FUEL DEW POINT HEATING UTILIZING GAS TURBINE EXHAUST

BACKGROUND

The present invention relates generally to a gas turbine engine and more particularly to an inlet bleed heat system design for the gas turbine engine.

In general, heat exchanger assembly includes heat pipes, tube and shell heat exchangers for flue gas heaters. Electric heaters are typically used for dew point heating due to lower fuel flow requirements during gas turbine startup. Certain combined cycle power plants do not have boiler feed water readily available for gas fuel heating, As a result, alternative means to heat the fuel are required.

A conventional technique includes externally fired combined cycle gas turbine which utilizes compressed air for system operation.

Another conventional technique includes a gas turbine system and method using temperature control of exhaust gas entering heat recovery cycle by mixing with ambient air. The technique utilizes exhaust gas to heat steam condensate for operation of a combined cycle power plant.

One other conventional technique includes an engine exhaust heat recovering apparatus.

However, the above mentioned conventional techniques require additional means for heating fuel in a gas turbine engine which requires additional expense and decreases overall efficiency of the engine.

Therefore there is a need in the art to provide a technique that provides means for utilizing heat from exhaust gas to increase overall efficiency of the engine.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 depicts a gas turbine exhaust utilized for fuel gas heating.

DETAILED DESCRIPTION

The invention proposes a technique that utilizes heat from exhaust gas to heat fuel and improves overall efficiency of the gas turbine engine. The technique includes a heat exchanger in a gas turbine exhaust stream which is utilized to heat a secondary fluid. The secondary fluid is further utilized within the gas turbine plant to pre-heat natural gas above hydrocarbon dew point as the fuel flows to the gas turbine. The invention...