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SIMPLIFIED GAS PURGE SYSTEM WITH NATURAL HEAT REJECTION

IP.com Disclosure Number: IPCOM000251591D
Publication Date: 2017-Nov-14
Document File: 4 page(s) / 1M

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention is a Fuel Purge System for Gas Turbine Engines that uses Compressor Discharge Pressure (CDP) air to push remaining fuel in the gas manifold out into the combustor chamber and to prevent the ingestion of combustion gases through the gas fuel path that is prone to causing coking in the internal paths of the Fuel Nozzle.

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SIMPLIFIED GAS PURGE SYSTEM WITH NATURAL HEAT REJECTION

ABSTRACT

The invention is a Fuel Purge System for Gas Turbine Engines that uses Compressor Discharge

Pressure (CDP) air to push remaining fuel in the gas manifold out into the combustor chamber

and to prevent the ingestion of combustion gases through the gas fuel path that is prone to

causing coking in the internal paths of the Fuel Nozzle.

BACKGROUND

Formation of coke in the fuel nozzles can cause a temperature spread of the exhaust gas

temperature (EGT) and unplanned maintenance for cleaning nozzles and rebalancing the EGT.

The invention is a Fuel Purge System for Gas Turbine Engines that uses Compressor Discharge

Pressure (CDP) air to push remaining fuel in the gas manifold out into the combustor chamber

and to prevent the ingestion of combustion gases through the gas fuel path that is prone to

causing coking in the internal paths of the Fuel Nozzle. The coke formation in the gas hole

nozzle occurs after extended periods of time running on Liquid Fuel.

The Fuel Purge System is aided by thin wall piping or finned tubes that are capable of rejecting

heat to the environment, thus controlling the CDP air temperature flowing towards the combustor

and preventing auto-ignition due to the mix of CDP hot air and remaining fuel in the manifold

without the need of a Heat Exchanger.

DETAILED DESCRIPTION

The Purge System takes high-pressure hot air from the CDP bleed port of the gas turbine and

drives the air through the stainless steel thin wall piping or finned piping, which dissipates the

heat along its length until the air cools down to a limit at which it is safe, thus avoiding auto-

ignition with the remaining fuel in the manifold. All of this is achieved without the need of a

Heat Exchanger.

The air temperature is confirmed with a sensor. If the sensor’s reading is below the auto-ignition

temp...