Lobe lance for a gas turbine combustor

Patent metadata

Field	Value
Publication number	US-10443852-B2
Application number	US-201514947386-A
Country	US
Kind code	B2
Filing date	Nov 20, 2015
Priority date	Nov 20, 2014
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

Abstract

A lobe lance is disclosed for a gas turbine combustor which includes a plurality of N (N≥4) lobe fingers, each configured as a streamlined body with two lateral surfaces. A plurality of nozzles for injecting a gaseous and/or liquid fuel mixed with air are provided whereby lobes running between the nozzles are provided for improving the mixing quality and reducing pressure loss in said combustor. The lobes of each lobe finger have one of two opposite orientations with respect to said flow direction, and the lobes of all lobe fingers follow a predetermined pattern of orientation across the lobe fingers at least one pair of neighboring lobe fingers has the same lobe orientation resulting in a grouped lobe arrangement ( . . . LL . . . or . . . RR . . . ) such that at least two of the vortices generated by the lobe shape downstream of the lobe fingers combine.

First claim

The invention claimed is:

1. A lobe lance for a gas turbine combustor, comprising:
a plurality of N lobe fingers wherein N≥4, each of said lobe fingers is configured as a streamlined body which has a streamlined cross-sectional profile, said streamlined body has two surfaces parallel to a direction of hot gas flow, said surfaces being joined at respective upstream sides by a leading edge and being joined at respective downstream sides forming a trailing edge, each lobe finger including a plurality of nozzles for injecting a gaseous and/or liquid fuel mixed with air distributed along said trailing edge, and lobes running between said nozzles provided at said trailing edge for impacting the mixing quality and reducing pressure loss in said combustor, wherein the lobes of each lobe finger has one of two opposite orientations (R, L) with respect to the direction of hot gas flow, and the lobes of all lobe fingers follow a predetermined pattern of orientation across the lobe fingers, and at least two pairs of adjacent lobe fingers of the plurality of lobe fingers has the same lobe orientation resulting in a grouped lobe arrangement ( . . . LL . . . and . . . RR . . . ) such that at least two vortices generated downstream of said lobe fingers combine, wherein each lobe finger of the plurality of lobe fingers having a lobe orientation (R) has trailing edge lobes with an apex pointing in a right direction when looking downstream and each lobe finger of the plurality of lobe fingers with a lobe orientation (L) has trailing edge lobes with an apex pointing in a left direction when looking downstream,
wherein N=NR+NL with NR being a number of lobe fingers of the plurality of lobe fingers having a first lobe orientation (R), and NL being the number of lobe fingers of the plurality of lobe fingers having a second lobe orientation (L) opposite to said first lobe orientation, and
wherein NR and NL are both at least 2.

2. The lobe lance as claimed in claim 1 , wherein N R and N L are within 1.

3. The lobe lance as claimed in claim 1 , wherein said predetermined pattern of orientation is one of the following patterns:
RR . . . RRLL . . . LL,
LL . . . LLRR . . . RR,
RR . . . RRLL . . . LLRR
RR . . . RRLL . . . LLRR . . . RRLL . . . LL,
LL . . . LLRR . . . RR
LL . . . LLRR . . . RRLL . . . LLRR . . . RR,
RRLL . . . LLRR
RRLL . . . LLRR . . . RRLL,
LLRR . . . RRLL
LLRR . . . RRLL . . . RRLL,
with N/2=N R =N L for N being an even number, or with N/2=N R +1=N L −1 or N/2=N R −1=N L +1 for N being an odd number.

4. The lobe lance as claimed in claim 3 , wherein N=8, and that said predetermined pattern of orientation is one of the following patterns:
RRRRLLLL,
LLLLRRRR,
RRLLRRLL,
LLRRLLRR,
RRLLLLRR,
LLRRRRLL.

5. The lobe lance as claimed in claim 1 , wherein N=4.

6. The lobe lance as claimed in claim 5 , wherein said predetermined pattern of orientation is either RRLL or LLRR.

7. The lobe lance as claimed in claim 5 , wherein said predetermined pattern of orientation is either RLLR or LRRL.

8. The lobe lance as claimed in claim 5 , wherein said predetermined pattern of orientation is one of the following patterns:
RRRL, RLLL,
LLLR, LRRR,
RRRR, LLLL.

9. The lobe lance as claimed in claim 1 , wherein said plurality of lobe fingers are arranged between left and right side walls, and lobe fingers adjacent to said side walls have a predetermined lobe orientation according to one of the following schemes:
(left wall) R . . . L (right wall),
(left wall) L . . . R (right wall).

10. The lobe lance as claimed in claim 1 , wherein each of said plurality of lobe fingers has an even number of nozzles, and lobe fingers have a predetermined lobe orientation according to the scheme (left wall) R . . . L (right wall).

11. The lobe lance as claimed in claim 1 , wherein each lobe finger of the plurality of lobe fingers has a lobe finger chord bisecting the lobe finger from the leading edge to the trailing edge and the lobe finger chords of two of said lobe fingers are closer to each other at the trailing edge than at the leading edge.

12. A gas turbine comprising:
the lobe lance of claim 1 .

Assignees

• Ansaldo Energia Switzerland AG

Inventors

• Yang Yang
• Düsing Michael

Classifications

• F23R3/20

  incorporating fuel injection means · CPC title

• F23R3/18

  Flame stabilising means, e.g. flame holders for after-burners of jet-propulsion plants · CPC title

• F02C7/222

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

• F23R3/286

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

• F23R3/12

  inducing a vortex · CPC title