EP3657072B1 - Lance for a burner and method for retrofitting a lance - Google Patents
Lance for a burner and method for retrofitting a lance Download PDFInfo
- Publication number
- EP3657072B1 EP3657072B1 EP18208164.6A EP18208164A EP3657072B1 EP 3657072 B1 EP3657072 B1 EP 3657072B1 EP 18208164 A EP18208164 A EP 18208164A EP 3657072 B1 EP3657072 B1 EP 3657072B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- duct
- lance
- sleeve
- pin
- nozzle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims description 17
- 238000009420 retrofitting Methods 0.000 title claims description 7
- 239000000446 fuel Substances 0.000 description 22
- 238000002485 combustion reaction Methods 0.000 description 14
- 239000007789 gas Substances 0.000 description 14
- 239000000463 material Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing tubes
- F23D14/64—Mixing devices; Mixing tubes with injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
- F23R3/34—Feeding into different combustion zones
Description
- The present invention relates to lance for a burner and a method for retrofitting a lance.
- Burners, in particular those of the reheat type, can comprise a body, through which a hot gas flow can flow through, and a lance protruding into the body for injecting fuel into the hot gas flow.
- The lance can have a duct for a first fuel and nozzles for injecting it. The lance can further comprise a sleeve encircling the duct and provided with nozzles as well; the nozzles of the sleeve are aligned with the nozzles of the duct.
- The lance can further comprise an inner duct, provided inside of the duct for injecting a second fuel, typically different from the fuel passing through the duct, via nozzles. The nozzles of the inner duct are also aligned with the nozzles of the duct and nozzles of the sleeve.
- During operation, fuel is supplied via the inner duct or via the duct and at the same time air is supplied via the sleeve, such that fuel (from the inner duct or from the duct) is injected together with shielding air (via the sleeve).
- During operation in order to guarantee correct operation of the burner, it is important that the nozzles of the inner duct, nozzles of the duct and nozzles of the sleeve are aligned.
- Nevertheless, because of the construction the alignment of the nozzles can be lost during operation.
-
US 2007/0207425 A1 discloses a lance for a burner comprising a duct having at least a nozzle, and a sleeve around the duct, the sleeve having at least a nozzle. The nozzle of the duct and the nozzle of the sleeve are aligned, the sleeve has a terminal portion closed by a cap having a pin, the duct has a hole, and the pin is form fittingly inserted into the hole. -
EP 2 388 520 A1 discloses a lance burner for a gas turbine. - The lance comprises an inner duct having nozzles, a duct having nozzles and a sleeve having nozzles. The nozzles align. The sleeve is closed by a cap.
- An aspect of the invention includes providing a lance and a method by which the alignment of the nozzles through which fuel and shielding air is injected is improved compared to existing lances.
- These and further aspects are attained by providing a lance and a method in accordance with the accompanying claims.
- Further characteristics and advantages will be more apparent from the description of a preferred but non-exclusive embodiment of the lance and method, illustrated by way of non-limiting example in the accompanying drawings, in which:
-
Figure 1 shows a burner having the lance; -
Figure 2 shows a portion of the lance; -
Figure 3 shows a portion of another embodiment of the lance; -
Figure 4 shows a cap; -
Figures 5 through 8 show the steps of a first embodiment of the method; -
Figures 9 through 12 show the steps of the method in another embodiment. - With reference to the figures, these show a burner, preferably of a gas turbine.
- The gas turbine can comprise, in sequence, a compressor, a first combustion chamber, a second combustion chamber and a turbine. Between the first and the second combustion chambers a high pressure turbine and/or a mixer for supplying diluting air can be provided.
- During operation, air is compressed at the compressor and is supplied into the first combustion chamber, where fuel is supplied and combusted with the compressed air, generating hot gas. The hot gas can be partially expanded in a high pressure turbine and/or can be diluted with air in a mixer (according to the scheme of the gas turbine) and is then supplied into the second combustion chamber. At the second combustion chamber further fuel is injected and combusted with the residual oxygen contained in the hot gas after the combustion in the first combustion chamber; the hot gas emerging from the second combustion chamber is expanded in the turbine.
- The second combustion chamber is schematically shown in
figure 1 and it is identified withreference 1. - The
second combustion chamber 1 comprises aburner 2 and acombustion area 3. Theburner 2 has atubular body 4 withvortex generators 5 at its entrance to increase vorticity of the hot gas, and alance 6 for injecting fuel.Reference 7 infigure 1 identifies the flame. - The
lance 6 has aduct 10 for carrying afuel 11, typically gas, and one or preferably more than onenozzles 12, for injecting thefuel 11. - The
lance 6 also has asleeve 13, provided around theduct 10, preferably concentrically; thesleeve 13 defines a channel between theduct 10 and thesleeve 13 and has one or preferably more than onenozzles 14. Thesleeve 13 carriesair 15, that is injected through thenozzles 14 as shielding air. - The
nozzles 12 of theduct 10 and thenozzle 14 of thesleeve 13 are aligned, e.g. their axes substantially overlap. - The
lance 6 can also have aninner duct 17 inside theduct 10; preferably theinner duct 17 is concentrically provided in theduct 10. In addition, theinner duct 17 is provided with one or more than onenozzles 18, which are aligned with thenozzles 12 of theduct 10 andnozzles 14 of thesleeve 13, e.g. the axes of thenozzles - Preferably the terminal parts of the
duct 10 andinner duct 17 are connected together. - A first channel for carrying a
fuel 19, which can be same as or different from thefuel 11, is defined by theinner duct 17. - Advantageously, the
sleeve 13 has aterminal portion 20 closed by acap 21 having apin 22; correspondingly, theduct 10 has an end with ahole 23. Thepin 22 is form fittingly inserted into thehole 23. Therefore thepin 22 prevents radial movements of thesleeve 13 with respect to theduct 10 as indicated by the arrow RM, but it allows axial sliding of thepin 22 into thehole 23, in the direction of arrow AM, caused for example by differential temperatures among the different parts of thelance 6 during operation. - Advantageously, since the
pin 22 is provided in a cap that is connected to the terminal part of the sleeve, it can be manufactured with very small tolerances; likewise thehole 23 can be realised with very small tolerances, such that the coupling of thepin 22 into thehole 23 defines a form fitting coupling. - The
cap 21 has ahub part 25 and aconcave part 26 extending from thehub part 25; thepin 22 extends from thehub part 25 and is housed in theconcave part 26. - In addition, the
concave part 26 has acap border 27 defining a terminal section for thecap 21; thepin end 28 is closer to thecap border 27 than to thehub part 25. - In an advantageous embodiment, the
pin 22 has a length L that is at least as large as its diameter D. -
Figure 3 shows a lance similar to the one offigure 2 . In particular, the lance offigure 3 has abush 29 between thepin 22 and thehole 23. - For example a lance according to this embodiment can be the result of a repair operation, in which damaged material around the
hole 23 is removed and thebush 29 is provided to match the new bigger diameter of thehole 23 with the diameter of thepin 22. - The lance also has a centering arrangement, which is provided between the
duct 10 and thesleeve 13, for fixing the radial position of thesleeve 13 with respect to theduct 10. - The centering arrangement is provided at a side of the
lance 6 opposite the one with thecap 21 with respect to the alignednozzles - The
lance 6 further has a stop arrangement for fixing the axial position of thesleeve 13 with respect to theduct 10; this stop arrangement is also provided between theduct 10 and thesleeve 13. - Preferably, the centering arrangement and the stop arrangement are defined by a
same system 30, such as a bayonet system. - A further centering
arrangement 31 is also provided between theduct 10 and theinner duct 17. - The operation of the lance is apparent from that described and illustrated and is substantially the following.
- Fuel 11 (gas fuel) is injected via the
nozzles 12 and/or fuel 19 (liquid fuel) is injected via thenozzles 18. At the sametime shielding air 15 is injected via thenozzles 14. - Thermal and mechanical stresses tend to move the
inner duct 17,duct 10 andsleeve 13 away from their correct positions and so misalign the axes of thenozzles pin 22 together with thehole 23 precisely defines the centering of theinner duct 17,duct 10 andsleeve 13. This guarantees that centering is not lost and consequently the axes of thenozzles - On the contrary without a form fitting connection of the pin into a hole, correct centering is difficult to maintain, with consequent misalignment of the axes of the
nozzles - The present invention also refers to a method for retrofitting a lance.
- The lance, before retrofitting (
figure 5 ), comprises - a. a duct having at least a nozzle,
- b. a sleeve around and preferably concentric to the duct, the sleeve having at least a nozzle,
- c. wherein the nozzle of the duct and the nozzle of the sleeve are aligned,
- d. the sleeve having a closed terminal portion.
- The method comprises
- removing the closed terminal portion of the sleeve; for example this can be done by cutting (
figure 6 ), - providing a
cap 21 having a pin 22 (figure 6 ), - providing a
hole 23 in the duct (figure 7 ), - form fittingly inserting the
pin 22 into the hole 23 (figure 8 ), - connecting the
cap 21 to the sleeve (figure 8 ). - The method can also comprises providing a
bush 29 between thehole 23 and the pin 22 (figure 11 ); in this case the provision of the hole can also encompass the provision of an enlargement of an already existing hole, e.g. a hole is already provided but it is made bigger, e.g. to remove damaged material. This particular embodiment of the method is particularly relevant for repair of damaged lances. - In this respect,
figures 5 through 8 show the steps of a method for retrofitting a lance that originally is not provided withpin 22 andhole 23, andfigures 9 through 12 show the steps of a method for retrofitting a lance that is originally already provided withpin 22 andhole 23. - The
bush 29 is preferably fixed only to thehole 23 and thepin 22 is form fittingly inserted into thebush 29. - Naturally the features described may be independently provided from one another.
- In practice the materials used and the dimensions can be chosen at will according to requirements and to the state of the art.
REFERENCE NUMBERS 1 combustion chamber 2 burner 21 cap 3 combustion area 22 pin 4 body 23 hole 5 vortex generator 25 hub 6 lance 26 concave part 7 flame 27 cap border 10 duct 28 pin end 11 first fuel (gas fuel) 29 bush 12 nozzle 30 bayonett system 13 sleeve 31 further centering system 14 nozzle RM radial movement 15 air AM axial movement 17 inner duct L length of the pin 18 nozzle D diameter of the pin 19 second fuel (liquid fuel) 20 terminal portion of the sleeve
Claims (13)
- A lance (6) for a burner (2) comprisinga. a duct (10) having at least a nozzle (12),b. a sleeve (13) around the duct (10), the sleeve (13) having at least a nozzle (14),characterized by comprising an inner duct (17) inside the duct (10), wherein the inner duct (17) has at least a nozzle (18) aligned with the at least a nozzle (12) of the duct (10) and the at least a nozzle (14) of the sleeve (13).
wherein:the nozzle (12) of the duct (10) and the nozzle (14) of the sleeve (13) are aligned,the sleeve (13) has a terminal portion (20) closed by a cap (21) having a pin (22),the duct (10) has a hole (23),the pin (22) is form fittingly inserted into the hole (23); - The lance (6) of claim 1, characterised in that the cap (21) has a hub part (25) and a concave part (26) extending from the hub part (25), wherein the pin (22) extends from the hub part (25) and is housed in the concave part (26).
- The lance (6) of claim 2,
characterised in that the concave part (26) has a cap border (27) defining a terminal section for the cap (21), wherein a pin end (28) is closer to the cap border (27) than to the hub part (25). - The lance (6) of any of the previous claims, characterised in that the pin (22) has a length (L) that is at least as large as its diameter (D).
- The lance (6) of any of the previous claims, characterized in that a bush (29) is provided between the pin (22) and the hole (23).
- The lance (6) of any of the previous claims, characterised in that a centering arrangement is provided between the duct (10) and the sleeve (13).
- The lance (6) of claim 6, characterised in that the centering arrangement is provided at a side of the lance (6) opposite the one with the cap (21) with respect to the aligned at least a nozzle (12) of the duct (10) and nozzle (14) of the sleeve (13).
- The lance (6) of any of the previous claims, characterised in that a stop arrangement for fixing the position of the sleeve (13) with respect to the duct (10) is provided between the duct (10) and the sleeve (13).
- The lance of claims 6 and 8 or 7 and 8, characterised in that the centering arrangement and the stop arrangement are defined by a same system (30).
- The lance of any of the previous claims, characterised in that the terminal parts of the duct (10) and inner duct (17) are connected together.
- Method for retrofitting a lance comprisinga. a duct having at least a nozzle,b. a sleeve around the duct and having at least a nozzle,c. wherein the at least a nozzle of the duct and the at least a nozzle of the sleeve are aligned,d. the sleeve having a closed terminal portion,the method comprising
removing the closed terminal portion of the sleeve, providing a cap (21) having a pin (22),
providing a hole (23) in the duct (10),
form fittingly inserting the pin (22) into the hole (23),
connecting the cap (21) to the sleeve (13). - The method of claim 11, characterised by providing a bush (29) between the hole (23) and the pin (22).
- The method of claim 12, characterised in that the bush (29) is fixed only to the hole (23) and the pin (22) is form fittingly inserted into the bush (29).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18208164.6A EP3657072B1 (en) | 2018-11-23 | 2018-11-23 | Lance for a burner and method for retrofitting a lance |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP18208164.6A EP3657072B1 (en) | 2018-11-23 | 2018-11-23 | Lance for a burner and method for retrofitting a lance |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3657072A1 EP3657072A1 (en) | 2020-05-27 |
EP3657072B1 true EP3657072B1 (en) | 2021-08-11 |
Family
ID=64456905
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18208164.6A Active EP3657072B1 (en) | 2018-11-23 | 2018-11-23 | Lance for a burner and method for retrofitting a lance |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP3657072B1 (en) |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004041272B4 (en) * | 2004-08-23 | 2017-07-13 | General Electric Technology Gmbh | Hybrid burner lance |
EP2199674B1 (en) * | 2008-12-19 | 2012-11-21 | Alstom Technology Ltd | Burner of a gas turbine having a special lance configuration |
EP2388520B1 (en) * | 2010-05-20 | 2016-10-26 | General Electric Technology GmbH | Lance of a gas turbine burner |
-
2018
- 2018-11-23 EP EP18208164.6A patent/EP3657072B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP3657072A1 (en) | 2020-05-27 |
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