Pre-Film Liquid Fuel Cartridge

Patent metadata

Field	Value
Publication number	US-2017159561-A1
Application number	US-201415129899-A
Country	US
Kind code	A1
Filing date	Apr 4, 2014
Priority date	Apr 4, 2014
Publication date	Jun 8, 2017
Grant date	—

Abstract

A pre-film liquid fuel cartridge includes a main body having a water passage, a liquid fuel passage, a compressed air passage and a pre-film tip disposed at a downstream portion of the pre-film liquid fuel cartridge. The pre-film tip includes a forward end portion that is axially separated from an aft end portion and an inner side that extends therebetween. The inner side at least partially defines a pre-filming surface which terminates at an emulsion atomizing shear edge. The pre-film tip includes a plurality of water injection ports oriented tangentially through the pre-filming surface, a plurality of liquid fuel injection ports oriented tangentially through the pre-filming surface and a plurality of atomizing air injection ports axially oriented around the emulsion atomizing shear edge. An atomizing air shear edge is defined downstream from the emulsion atomizing shear edge and the atomizing air injection ports.

First claim

What is claimed is:

1 . A pre-film liquid fuel cartridge, comprising:
a main body; a water passage defined within the main body; a liquid fuel passage defined within the main body; a compressed air passage defined within the main body; a pre-film tip disposed at a downstream end portion of the pre-film liquid fuel cartridge, the pre-film tip having a forward end portion axially separated from an aft end portion and an inner side that extends therebetween, the inner side defining a pre-filming surface, wherein the pre-filming surface terminates at an emulsion atomizing shear edge; and wherein the pre-film tip comprises:
a plurality of water injection ports oriented tangentially through the pre-filming surface proximate to the forward end portion and in fluid communication with the water passage;
a plurality of liquid fuel injection ports oriented tangentially through the pre-filming surface between the water injection ports and the emulsion atomizing shear edge and in fluid communication with the liquid fuel passage;
a plurality of atomizing air injection ports axially oriented around the emulsion atomizing shear edge and in fluid communication with the compressed air passage; and
an atomizing air shear edge defined radially outwardly from the atomizing air injection ports downstream from the emulsion atomizing shear edge.

2 . The pre-film liquid fuel cartridge as in claim 1 , wherein the pre-filming surface is arcuate.

3 . The pre-film liquid fuel cartridge as in claim 1 , wherein each water injection port is oriented to direct a jet of water onto the pre-filming surface.

4 . The pre-film liquid fuel cartridge as in claim 1 , wherein at least one of the water injection ports is oriented to induce swirl to a corresponding jet of water.

5 . The pre-film liquid fuel cartridge as in claim 1 , wherein each liquid fuel injection port is oriented to direct a jet of liquid fuel onto the pre-filming surface.

6 . The pre-film liquid fuel cartridge as in claim 1 , wherein at least one of the liquid fuel injection ports is oriented to induce swirl to a corresponding jet of liquid fuel.

7 . The pre-film liquid fuel cartridge as in claim 1 , wherein the emulsion atomizing shear edge is axially offset from the atomizing air shear edge.

8 . The pre-film liquid fuel cartridge as in claim 1 , wherein the atomizing air injection ports are oriented to provide swirl to a flow of compressed air exiting the atomizing air injection ports.

9 . The pre-film liquid fuel cartridge as in claim 1 , further comprising a step that extends radially and circumferentially along the inner side of the pre-film tip downstream from the water injection ports.

10 . A pre-film liquid fuel cartridge, comprising:
a water passage defined within a main body; a liquid fuel passage defined within the main body radially outwardly from the water passage; a compressed air passage defined within the main body radially outwardly from the liquid fuel passage; a pre-film tip disposed at a downstream end portion of the pre-film liquid fuel cartridge, the pre-film tip having a forward end portion axially separated from an aft end portion and an inner side that extends therebetween, the inner side defining a pre-filming surface, wherein the pre-filming surface terminates at an emulsion atomizing shear edge; and wherein the pre-film tip comprises:
a plurality of upstream air injection ports oriented tangentially through the pre-filming surface proximate to the forward end portion and in fluid communication with the compressed air passage;
a plurality of water injection ports oriented tangentially through the pre-filming surface downstream from the upstream air injection ports and in fluid communication with the water passage;
a plurality of liquid fuel injection ports oriented tangentially through the pre-filming surface between the water injection ports and the emulsion atomizing shear edge and in fluid communication with the liquid fuel passage;
a plurality of atomizing air injection ports axially oriented around the emulsion atomizing shear edge and in fluid communication with the compressed air passage; and
an atomizing air shear edge defined radially outwardly from the atomizing air injection ports downstream from the emulsion atomizing shear edge.

11 . The pre-film liquid fuel cartridge as in claim 10 , wherein each upstream air injection port is oriented to direct an inner flow of compressed air onto the pre-filming surface.

12 . The pre-film liquid fuel cartridge as in claim 11 , wherein at least one of the upstream air injection ports is oriented to induce swirl to a corresponding flow of a diluent.

13 . The pre-film liquid fuel cartridge as in claim 10 , wherein each water injection port is oriented to direct a jet of water onto the pre-filming surface.

14 . The pre-film liquid fuel cartridge as in claim 13 , wherein at least one of the water injection ports is oriented to induce swirl to a corresponding jet of water.

15 . The pre-film liquid fuel cartridge as in claim 10 , wherein each liquid fuel injection port is oriented to direct a jet of liquid fuel onto the pre-filming surface.

16 . The pre-film liquid fuel cartridge as in claim 15 , wherein at least one of the liquid fuel injection ports is oriented to induce swirl to a corresponding jet of liquid fuel.

17 . The pre-film liquid fuel cartridge as in claim 10 , wherein the emulsion atomizing shear edge is axially offset from the atomizing air shear edge.

18 . The pre-film liquid fuel cartridge as in claim 17 , wherein the atomizing air injection ports are oriented to provide swirl to a flow of compressed air exiting the compressed air passage and wherein the emulsion atomizing shear edge is shaped to direct a quasi-emulsion of water, liquid fuel and compressed air into the flow of the compressed air from the atomizing air injection ports.

19 . A gas turbine, comprising:
a compressor, a combustor disposed downstream from the compressor and a turbine disposed downstream from the combustor, the combustor including a fuel nozzle extending downstream from an end cover, the fuel nozzle defining a fuel cartridge passage; a pre-film liquid fuel cartridge disposed within the liquid fuel cartridge passage, the pre-film liquid fuel cartridge having a main body, a water passage defined within the main body, a liquid fuel passage defined within the main body, a compressed air passage defined within the main body and a pre-film tip disposed at a downstream portion of the pre-film liquid fuel cartridge proximate to an end portion of the fuel nozzle, the pre-film tip having an forward end portion axially separated from an aft end portion and an inner side that extends therebetween, the inner side defining an arcuate pre-filming surface, wherein the pre-filming surface terminates at an emulsion atomizing shear edge; and wherein the pre-film tip comprises:
a plurality of water injection ports oriented tangentially through the pre-filming surface proximate to the forward end portion and in fluid communication with the water passage;
a plurality of liquid fuel injection ports oriented tangentially through the pre-filming surface between the water injection ports and the emulsion atomizing shear edge and in fluid communication with the liquid fuel passage; and
a plurality of atomizing air injection ports axially oriented around the emulsion atomizing shear edge and in fluid communication with the compressed air passage.

20 . The gas turbine as in claim 19 , furt

Assignees

• Shershnyov Borys Borysovych
• Gerasimov Alexey Yurievich
• Gen Electric

Inventors

• Shershnyov Borys Borysovych
• Gerasimov Alexey Yurievich

Classifications

• F02C7/141

  of working fluid · CPC title

• F02C3/30 Primary

  Adding water, steam or other fluids {for influencing combustion, e.g. to obtain cleaner exhaust gases (F02C7/141, F02C7/30, F01D21/00, F01K21/04, F23D11/10 take precedence)} · CPC title

• F23D11/16

  in which an emulsion of water and fuel is sprayed · CPC title

• F23R3/286

  having fuel-air premixing devices (F23R3/30 takes precedence) · CPC title

• F23R3/343

  Pilot flames, i.e. fuel nozzles or injectors using only a very small proportion of the total fuel to insure continuous combustion (ignition in gas-turbine plants F02C7/264; pilot flame igniters F23Q9/00) · CPC title