Cooled fuel injector system for a gas turbine engine

Patent metadata

Field	Value
Publication number	US-10400672-B2
Application number	US-201415029503-A
Country	US
Kind code	B2
Filing date	Oct 31, 2014
Priority date	Nov 4, 2013
Publication date	Sep 3, 2019
Grant date	Sep 3, 2019

Abstract

A cooling system for a fuel injector system of a gas turbine engine has a heat exchanger for cooling a portion of diffuser case air and then routing the cooled diffuser case air through a sleeve that surrounds a fuel injector conduit located in at least the diffuser case plenum for minimizing fuel heat-up rates in the conduit. By minimizing fuel temperatures within the injector conduit, coking accumulation is thereby eliminated or reduced.

First claim

What is claimed is:

1. A cooling system for a fuel injector system of a combustor section of a gas turbine engine, the cooling system comprising:
a heat exchanger for cooling hot diffuser case air;
a cooling fluid sleeve surrounding at least in part a fuel conduit of a fuel injector and extending to about a tip of the fuel injector of the fuel injector system;
an outlet of the sleeve proximate to the tip;
an inlet of the sleeve for receiving cooled diffuser case air; and
a distribution apparatus constructed and arranged to receive the cooled diffuser case air from the outlet and direct the cooled diffuser case air onto a backside of at least one heat shield of a bulkhead assembly of the combustor section.

2. The cooling system of claim 1 , wherein the distribution apparatus has a plurality of tubes spaced circumferentially from one another and about the tip.

3. The cooling system of claim 1 , wherein the distribution apparatus has an expansion joint for connection to the cooling fluid sleeve.

4. The cooling system of claim 1 , wherein the heat exchanger is configured for conditioning the cooled diffuser case air.

5. The cooling system of claim 4 wherein the heat exchanger is constructed and arranged to receive bypass air of the gas turbine engine for cooling of the diffuser case air.

Assignees

• United Technologies Corp

Inventors

• Frish John D
• Williams Alexander W
• Bradshaw Sean D

Classifications

• F23R3/283

  Attaching or cooling of fuel injecting means including supports for fuel injectors, stems, or lances · CPC title

• F02C7/14 Primary

  of fluids in the plant {, e.g. lubricant or fuel (F02C7/185 takes precedence)} · CPC title

• F05D2260/231

  Preventing heat transfer · CPC title

• F02C7/222

  Fuel flow conduits, e.g. manifolds · CPC title

• F05D2220/32

  in gas turbines · CPC title