U.S. patent application number 13/819351 was filed with the patent office on 2013-07-18 for burner arrangement.
The applicant listed for this patent is Matthias Hase, Jurgen Meisl. Invention is credited to Matthias Hase, Jurgen Meisl.
Application Number | 20130180251 13/819351 |
Document ID | / |
Family ID | 43479478 |
Filed Date | 2013-07-18 |
United States Patent
Application |
20130180251 |
Kind Code |
A1 |
Hase; Matthias ; et
al. |
July 18, 2013 |
BURNER ARRANGEMENT
Abstract
A burner arrangement includes a carrier and at least two burners
which are mounted on the carrier in a flow direction Each burner
includes a cylindrical housing having a lance which is arranged
centrally therein and having a fuel duct and which is supported on
the housing via swirl blades. An attachment is arranged on the side
leading to a combustion chamber At least one fuel nozzle is
disposed in the attachment and is connected to the fuel duct. The
at least two fuel nozzles of the at least two burners have a
different functional characteristic and/or spray form, and the at
least two fuel nozzles of the at least two burners with a different
functional characteristic and/or spray form include at least one
full jet nozzle and at least one pressure swirl nozzle.
Inventors: |
Hase; Matthias; (Mulheim an
der Ruhr, DE) ; Meisl; Jurgen; (Mulheim an der Ruhr,
DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Hase; Matthias
Meisl; Jurgen |
Mulheim an der Ruhr
Mulheim an der Ruhr |
|
DE
DE |
|
|
Family ID: |
43479478 |
Appl. No.: |
13/819351 |
Filed: |
August 16, 2011 |
PCT Filed: |
August 16, 2011 |
PCT NO: |
PCT/EP11/64072 |
371 Date: |
February 27, 2013 |
Current U.S.
Class: |
60/747 |
Current CPC
Class: |
F23D 11/12 20130101;
F23C 2900/07021 20130101; F23D 2900/11002 20130101; F23R 3/36
20130101; F23R 3/286 20130101; F23D 2900/14021 20130101; F23C
2900/06042 20130101; F23C 5/08 20130101; F23M 20/005 20150115; F23R
2900/00014 20130101; F23D 11/38 20130101 |
Class at
Publication: |
60/747 |
International
Class: |
F23R 3/36 20060101
F23R003/36; F23C 5/08 20060101 F23C005/08 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 27, 2010 |
EP |
10174338.3 |
Claims
1-10. (canceled)
11. A burner arrangement, comprising: a carrier, at least two
burners which are mounted on the carrier in a flow direction,
wherein each burner comprises: a cylindrical housing having a lance
which is arranged centrally therein and having a fuel duct and
which is supported on the housing via swirl blades, wherein an
attachment is arranged on the side leading to a combustion chamber,
wherein at least one fuel nozzle is disposed in the attachment and
is connected to the fuel duct, wherein the at least two fuel
nozzles of the at least two burners have a different functional
characteristic and/or spray form.
12. The burner arrangement as claimed in claim 11, wherein for each
of the burners, the at least one fuel nozzle is arranged downstream
of the swirl blades.
13. The burner arrangement as claimed in claim 11, wherein the fuel
nozzles with a different functional characteristic differ from one
another at least in a nozzle size or a jet angle or liquid
distribution or an atomization characteristic.
14. The burner arrangement as claimed in claim 13, wherein, in the
case of a different atomization characteristic of the fuel nozzles,
at least the drop size distributions differ from one another.
15. The burner arrangement as claimed in claim 11, wherein the fuel
nozzles with a different spray form form a full jet, or a hollow
conical jet, or a full conical jet or a flat jet.
16. The burner arrangement as claimed in claim 11, wherein the fuel
nozzles are oil nozzles.
17. The burner arrangement as claimed in claim 11, wherein an even
number of burners which are mounted in the form of a ring on the
carrier is provided.
18. The burner arrangement as claimed in claim 17, wherein eight or
ten or twelve burners are provided.
19. The burner arrangement as claimed in claim 17, wherein at least
four burners are provided, all the burners opposite one another
having fuel nozzles with the same functional characteristic and
spray form.
20. The burner arrangement as claimed in claim 17, wherein at least
four burners are provided, at least two burners opposite one
another having fuel nozzles which have a different functional
characteristic and/or spray form.
21. The burner arrangement as claimed in claim 11, wherein an odd
number of burners is provided.
22. The burner arrangement as claimed in claim 11, wherein the at
least two fuel nozzles of the at least two burners with a different
functional characteristic and/or spray form comprise at least one
full jet nozzle and at least one pressure swirl nozzle.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is the US National Stage of International
Application No. PCT/EP2011/064072, filed Aug. 16, 2011 and claims
the benefit thereof. The International Application claims the
benefits of European application No. 10174338.3 EP filed Aug. 27,
2010. All of the applications are incorporated by reference herein
in their entirety.
FIELD OF INVENTION
[0002] The present invention relates to a burner arrangement.
BACKGROUND OF INVENTION
[0003] When the gas turbine is in operation, compressed air is
delivered to the combustion chamber from the compressor. The
compressed air is mixed with a fuel, for example oil or gas, and
the mixture is burnt in the combustion chamber. The hot combustion
exhaust gases are finally delivered as working medium, via a
combustion chamber outlet, to the turbine where, being expanded and
cooled, they transmit a pulse to the moving blades and thus perform
work.
[0004] A burner arrangement has a carrier with at least two burners
which are mounted on the carrier in the flow direction. Each burner
comprises a cylindrical housing with a lance which is arranged
centrally therein and has a fuel duct and which is supported on the
housing via swirl blades. In this case, an attachment is arranged
on the side leading to a combustion chamber, at least one fuel
nozzle in the attachment preferably being arranged downstream of
the swirl blades and being connected to the fuel duct. In gas
turbines, particularly those which are operated with two different
fuels, for example, injection of oil as fuel takes place in the
region of swirl generators in which the oil is mixed with air. For
better mixing of oil and air, the oil is set in swirling motion
within the nozzles used for injection. This oil nozzle is also
designated as a pressure swirl nozzle.
[0005] It is precisely in the case of gas turbines with two
different fuels that the oil nozzles cannot be arranged such that
the mixing of the fuel with air leads to an optimal result with
regard to the pressure pulsations.
SUMMARY OF INVENTION
[0006] The object of the present invention is, therefore to specify
a burner arrangement which solves the above problem.
[0007] The object is achieved by the features of the independent
claim(s). The further subclaims contain advantageous refinements of
the invention.
[0008] According to the invention, in such a burner arrangement,
the at least two fuel nozzles of the at least two burners have a
different functional characteristic and/or spray form. This gives
rise, with regard to the respective burner, to a different
penetration behavior of the fuel, injected through the fuel
nozzles, for example into the compressor air. The result of this is
that the flame zone of the respective burners has a different
stabilization point and is therefore also stabilized differently.
With regard to the overall combustion system, this causes blurring
of the combustion zones. Such blurring is understood in this
context to mean effects, such as, for example the broadening of the
flame zone, the avoidance of symmetrical structures and the
generation of zones having a different temperature. This leads to
an improved thermoaccoustic behavior.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Further advantages, features and properties of the present
invention are described in more detail below by means of exemplary
embodiments, with reference to the accompanying figures. The
features of the exemplary embodiments may in this case be
advantageous individually or in combination with one another.
[0010] FIG. 1 shows diagrammatically a section through an
individual burner of a burner arrangement according to the
invention.
[0011] FIG. 2 shows fuel distribution of a first burner arrangement
according to the invention with eight burners.
[0012] FIG. 3 shows fuel distribution of a second burner
arrangement according to the invention with eight burners.
[0013] FIG. 4 shows fuel distribution of a third burner arrangement
according to the invention with eight burners.
DETAILED DESCRIPTION OF INVENTION
[0014] FIG. 1 shows an individual burner 2 of such a burner
arrangement according to the invention. Swirl blades 4 are arranged
around a lance in the housing 12 of the burner 2 according to the
invention. The swirl blades 4 are arranged along the circumference
of the lance in the housing 12. A compressor air stream 7 is
conducted by the swirl blades 4 into that part of the burner 2
which leads to a combustion chamber (not shown). The air is set in
swirling motion by the swirl blades 4. Moreover, the lance
comprises a fuel duct 3. Furthermore, the burner 2 comprises an
attachment 10 on the side leading to the combustion chamber. The
attachment 10 may, for example, be welded or screwed to or cast on
directly with the lance. The usually several fuel nozzles 1 are
arranged in the attachment 10 preferably downstream of the swirl
blades 4 and are in this case flow-connected to the fuel duct 3,
illustrated here as an oil duct. Preferably eight such burners 2
are arranged (not shown) in a circle on a carrier. In this case,
the burners 2 are arranged around a pilot burner (not shown) having
a pilot cone. Moreover, the swirl blades 4 may also have additional
fuel nozzles which, however, are not illustrated here.
[0015] The at least two burners 2 have fuel nozzles 1 according to
the invention, each with a different functional characteristic
and/or a spray form. This means that the fuel nozzles 1 of one
burner 2 differ in their functional characteristic and/or in their
spray form from the fuel nozzles 1 of the other burner 2.
Alternatively, three or more burners 2 may also have fuel nozzles 1
according to the invention, each with a different functional
characteristic and/or spray form. The number of burners 2 and the
number of fuel nozzles 1, each with a different functional
characteristic and/or spray form, are therefore not fixed.
[0016] The functional characteristic of a fuel nozzle 1 is in this
case characterized at least by the nozzle size, the jet angle, the
liquid distribution and the atomization characteristic. In this
case, the nozzle size essentially fixes the fuel mass flow when
there is a given pressure difference. The atomization
characteristic in this case comprises at least the drop size
distribution. Thus, for example, simple pressure atomizers, swirl
nozzles or air-protected atomizers may be used. A distinction can
also be made in the spray form, thus the fuel nozzles 1 may, for
example, form a full jet, hollow conical jet, full conical jet or
flat jet. Other spray forms are also possible. The fuel nozzles 1
of the respective burners 2 have a different distribution and
penetration behavior of the fuel into the compressor air stream 7
on account of the different functional characteristic and/or spray
form. Thus, for example, a markedly greater depth of penetration of
the fuel into the air flow 7 may result in a closer distribution of
the fuel around the circumference of the attachment 10. The
different distribution and penetration behavior leads to a
different stabilization of the flame zone of the respective burners
2. This gives rise to blurring of the combustion zones in the
overall combustion system. The energy quantity available in each
case for feedback at a specific frequency is thus reduced and falls
below a critical limit. This leads to an improved thermoaccoustic
behavior.
[0017] FIG. 2 shows fuel distribution of a first burner arrangement
according to the invention with eight burners 2a, 2b from the
front. However, the invention is not restricted to eight burners
2a, 2b and also a different number of burners is possible. Thus,
here, the burners 2a have fuel nozzles 1 (FIG. 1) with a functional
characteristic and spray form which bring about an average radial
depth of penetration and broad fuel distribution around the
attachment 10. The burner 2a therefore has a broad fuel
distribution ring 19a around the attachment 10. The fuel
distribution ring 19a is at a long radial distance from the
attachment 10.
[0018] By contrast, the burners 2b have fuel nozzles 1 (FIG. 1)
with a functional characteristic and spray form which bring about a
very low radial depth of penetration and close fuel distribution
around the attachment 10. The burner 2b therefore has a narrow fuel
distribution ring 19b around the attachment 10. Moreover, the fuel
distribution ring 19b is at a short radial distance from the
attachment 10. FIG. 2 shows in this case a symmetrical arrangement
of burners 2a, 2b. In this case, the in each case four burners 2a
having the same functional characteristic and spray form are
arranged opposite one another. This applies likewise to the burners
2b. However, other arrangements may also be possible.
[0019] FIG. 3 shows fuel distribution of a second burner
arrangement according to the invention with eight burners 2a, 2b
from the front. In this case, the burners 2a, 2b are arranged
alternately.
[0020] FIG. 2 and FIG. 3 show burner arrangements which have in
each case two burners 2a, 2b with a different functional
characteristic and/or spray form in the fuel nozzles 1 (FIG. 1).
However, even several burners 2 with a different functional
characteristic and/or spray form in the fuel nozzles 1 (FIG. 1) may
be present in such a burner arrangement.
[0021] FIG. 4 shows fuel distribution of a third burner arrangement
according to the invention with eight burners 2a, 2b from the
front. In this case, six burners 2a have fuel nozzles 1 (FIG. 1)
with the same functional characteristic and spray form, whereas the
other two burners 2b have fuel nozzles 1 (FIG. 1) with a functional
characteristic and/or spray form different from this. In this case,
however, the functional characteristic and spray form of the fuel
nozzles 1 of the burners 2b are identical to one another. This
corresponds to an asymmetric arrangement of burners 2a, 2b. In
thermoacoustic terms, such an asymmetric arrangement is, in
particular, advantageous in order to prevent circumferential modes
in the overall burner system.
* * * * *