Fuel injection nozzle, fuel injection module and gas turbine

Patent metadata

Field	Value
Publication number	US-10634356-B2
Application number	US-201515508736-A
Country	US
Kind code	B2
Filing date	Sep 28, 2015
Priority date	Sep 29, 2014
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

A fuel injection nozzle (31) of the present invention comprises a pre-mixing passage (34) which mixes fuel (103) and air (102) to generate an air-fuel mixture; and an injection port (33) which is located downstream of the pre-mixing passage (34) and injects the air-fuel mixture into a combustion chamber (26). The fuel injection port (33) has a slit shape and a width that is less than a dimension that is twice as large as a quenching distance.

First claim

The invention claimed is:

1. A fuel injection nozzle comprising:
a pre-mixing passage which mixes fuel and air to generate an air-fuel mixture; and
an injection port which is located downstream of the pre-mixing passage and injects the air-fuel mixture into a combustion chamber,
wherein the injection port has a slit shape and a width that is less than a dimension that is twice as large as a quenching distance,
wherein the pre-mixing passage includes:
a first mixing section which mixes the fuel and the air to generate the air-fuel mixture in such a manner that a ratio of the fuel to the air-fuel mixture becomes a first fuel ratio; and
a second mixing section which mixes the air-fuel mixture generated in the first mixing section and the air to generate the air-fuel mixture in such a manner that the ratio of the fuel to the air-fuel mixture becomes a second fuel ratio lower than the first fuel ratio, and

wherein the second mixing section has a passage cross-sectional area decreasing toward a downstream side.

2. The fuel injection nozzle according to claim 1 ,
wherein the first fuel ratio is set to be equal to or higher than a value that is 15 vol % lower than an upper limit value of a combustible range.

3. The fuel injection nozzle according to claim 2 ,
wherein the pre-mixing passage includes:
a flame prevention plate which is located at a boundary region between the first mixing section and the second mixing section and has a through-hole with a diameter that is less than a dimension that is twice as large as the quenching distance.

4. A fuel injection module comprising:
a plurality of fuel injection nozzles each of which is recited in claim 3 ; and
a fuel supply section which supplies the fuel to the plurality of fuel injection nozzles,
wherein the fuel supply section branches at a downstream portion thereof into branch portions which supply the fuel to the plurality of fuel injection nozzles, respectively.

5. A gas turbine comprising:
the fuel injection nozzle recited in claim 3 .

Assignees

• Kawasaki Heavy Ind Ltd

Inventors

• Horikawa Atsushi
• Okada Kunio
• Yamashita Seiji
• Kazari Masahide
• Oda Takeo

Classifications

• F23R3/10

  for primary air (F23R3/06, F23R3/045 take precedence) · CPC title

• F23R3/28

  characterised by the fuel supply (burners F23D) · CPC title

• F23D14/08

  with axial outlets at the burner head · CPC title

• F23R3/286 Primary

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

• F02C7/232

  Fuel valves {(control of fuel supply by means of fuel metering valves F02C9/263)}; Draining valves or systems (valves in general F16K) · CPC title