CN104654359A - Drainage structure for premixed fuel injection nozzle of combustion chamber - Google Patents

Drainage structure for premixed fuel injection nozzle of combustion chamber Download PDF

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Publication number
CN104654359A
CN104654359A CN201510080615.4A CN201510080615A CN104654359A CN 104654359 A CN104654359 A CN 104654359A CN 201510080615 A CN201510080615 A CN 201510080615A CN 104654359 A CN104654359 A CN 104654359A
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China
Prior art keywords
air
conduction plate
air conduction
plate
drainage
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CN201510080615.4A
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Chinese (zh)
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CN104654359B (en
Inventor
刘小龙
张珊珊
查筱晨
张龙
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China United heavy-duty gas turbine technology Co., Ltd.
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Beijing Huatsing Gas Turbine & Igcc Technology Co Ltd
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Abstract

The invention discloses a drainage structure for a premixed fuel injection nozzle of a combustion chamber. The injection nozzle comprises a suspension flange, an outer pipe, an inner pipe, an air cyclone and the drainage structure; the drainage structure is arranged between the suspension flange and the air cyclone, and comprises a first air drainage plate, a second air drainage plate and a drainage mounting plate; the windward surface of the air drainage plate is arc-shaped; fin-shaped drainage pieces are arranged on the windward surface; a turbulent flow structure is arranged on each of the air drainage plate and the fin-shaped drainage piece. The two air drainage plates are respectively embedded into the outer pipe and are arranged symmetrically with respect to the axis of the outer pipe; one end of the first air drainage plate and one end of the second air drainage plate are mounted on the air cyclone; the other end of the first air drainage plate and the other end of the second air drainage plate are suspended. According to the structure, on one hand, the radial speed of the air at the inlet of the air cyclone can be effectively reduced, and the axial speed distribution of the air at the position is improved; on the other hand, small disturbance generated by the air helps to improve the mixing of a fuel and the air; therefore, the emission of NOx is effectively reduced; the tempering and the flame attachment are prevented.

Description

The flow guiding structure of a kind of combustion chamber premixer fuel nozzle
Technical field
The present invention relates to a kind of gas-turbine combustion chamber nozzle, particularly a kind of combustion chamber premixer fuel nozzle with flow guiding structure, belongs to gas turbine technology field.
Background technology
A kind of specific low NO of dry type xthe combustion system of discharge comprises multiple combustion chamber and arranges around turbine rotor axis with annular array, and air mixes with fuel by each combustion chamber before combustion, then puts burning mixt, thus produces the burning gases of HTHP.Fuel injection system for various combustion chamber is made up of multiple fuel nozzle, and this fuel nozzle is arranged on the end cap of this combustion chamber upstream extremity.If fuel does not mix before combustion with air, hot localised points will be formed in a combustion chamber.Hot localised points may increase NO xdischarge capacity, and the flame tempering that can increase in combustion chamber is in nozzle or be attached to the probability of nozzle, thus defective nozzle.
As everyone knows, the thermal efficiency of gas turbine engine systems improves with the rising of fuel gas temperature usually.Existing multiple technologies can be used to improve running temperature now, and minimize NO xdischarge capacity, and the probability of tempering and flame attach.Fuel and air can be made to mix before combustion by the design constantly improving nozzle evenly, thus reduce or prevent tempering or flame attach.The uniformity of mixing can be increased to a certain extent by the quantity increasing nozzle, but because nozzle is arranged on periphery, air flows to the velocity component that center can exist a radial direction from nozzle, this velocity component can affect the flowing of air in air cyclone, cause air and fuel mix uneven.Mix and unevenly can increase NO xdischarge, affects flame holding and causes tempering/flame attach.
Summary of the invention
The object of this invention is to provide the flow guiding structure of a kind of combustion chamber premixer fuel nozzle, an object of the present invention realizes the air capacity that active accommodation enters peripheral injector nozzles, the air contributing to peripheral injector nozzles and central nozzle distributes, improve the mixed effect of air and fuel, thus enhanced burning stability.
Another object of the present invention makes the air entering peripheral injector nozzles produce little disturbance, allows fuel in the mixing of little whirlpool yardstick, effectively improve the uniformity that fuel mixes with air.
Technical scheme of the present invention is as follows:
A flow guiding structure for combustion chamber premixer fuel nozzle, described nozzle comprises suspension flange, outer tube, interior pipe and air cyclone; Form fuel gas passageway between inner and outer tubes, internal tube is air duct; Described air cyclone is arranged on the outside of outer tube, and is connected with fuel gas passageway; It is characterized in that: described flow guiding structure is arranged on and hangs between flange and air cyclone, and this flow guiding structure comprises the first air conduction plate, the second air conduction plate and drainage plate installing plate; The curved shape in windward side of the first air conduction plate and the second air conduction plate; The side of the first air conduction plate and the second air conduction plate is nested on outer tube respectively, and arranges relative to the axisymmetrical of outer tube; One end of first air conduction plate and the second air conduction plate is arranged on air cyclone by drainage plate installing plate, the unsettled placement of the other end of the first air conduction plate and the second air conduction plate; The windward side of described first air conduction plate and the second air conduction plate is respectively arranged with fin-shaped flow deflector, and is provided with turbulence structure on the windward side and fin-shaped flow deflector of each air conduction plate.
Technical characteristic of the present invention is also: described nozzle also comprises support, one end of described first air conduction plate and the second air conduction plate is fixed on drainage plate installing plate by support, and drainage plate installing plate is fixed on the outside side near combustion chamber center line of air cyclone.
Another technical characteristic of the present invention is: the first described air conduction plate and the lee face of the second air conduction plate are furnished with reinforcement.
The lee face of the first air conduction plate of the present invention and the second air conduction plate is provided with reinforcement; Described turbulence structure is pit, projection or rib of column structure.
One end of the unsettled placement of the first air conduction plate of the present invention and the second air conduction plate is linked together by alignment pin and dowel hole.
The flow guiding structure of a kind of premixer fuel nozzle provided by the invention, has the following advantages: the radial velocity that 1. effectively can reduce air, had more uniform axial velocity profile before air enters air cyclone, improved the Homogeneous phase mixing of air and fuel; 2. increase the air capacity of peripheral injector nozzles, the air contributing to peripheral injector nozzles and central nozzle distributes; 3. the microvariations of turbulence structure generation, allow fuel in the mixing of little whirlpool yardstick, effectively improve the uniformity that fuel mixes with air.
Accompanying drawing explanation
Fig. 1 is the structural representation (sectional view) of premixer fuel nozzle embodiment of the present invention.
The three-dimensional structure schematic diagram that Fig. 2 is the embodiment shown in Fig. 1.
The three-dimensional partial structurtes schematic diagram that Fig. 3 is the embodiment shown in Fig. 2.
Fig. 4 a and Fig. 4 b is respectively the windward side of the first air conduction plate shown in Fig. 1 and the three-dimensional structure schematic diagram of lee face.
Fig. 5 a and Fig. 5 b is respectively the windward side of the second air conduction plate shown in Fig. 1 and the three-dimensional structure schematic diagram of lee face.
In figure, 1-outer tube; 2-hangs flange; 3-first air conduction plate; 4-second air conduction plate; 5-drainage plate installing plate; 6-support; 7-reinforcement; 8-alignment pin; 9-dowel hole; 10-air cyclone; 11-fin-shaped flow deflector; 12-turbulence structure; Pipe in 14-; 15-bellows; 16-glass holder; 17-fuel spray post; 18-fuel orifice.
Detailed description of the invention
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following instance for illustration of the present invention, but is not used in and limits the scope of the invention.
As shown in FIG. 1 to 3, combustion chamber provided by the invention premixer fuel nozzle comprises outer tube 1, hangs flange 2, air cyclone 10, interior pipe 14, bellows 15, glass holder 16, fuel spray post 17, fuel orifice 18 and flow guiding structure, fuel gas passageway is formed between interior pipe 14 and outer tube 1, interior pipe 14 inside is air duct, air cyclone is arranged on the outside of outer tube 1, and is connected with fuel gas passageway; Described flow guiding structure is arranged on and hangs between flange 2 and air cyclone 10, and this flow guiding structure comprises the first air conduction plate 3, second air conduction plate 4 and drainage plate installing plate 5; The curved shape in windward side of the first air conduction plate 3 and the second air conduction plate 4; The side of the first air conduction plate 3 and the second air conduction plate 4 is semi arch, is nested in respectively on outer tube 1, and arranges relative to the axisymmetrical of outer tube 1; One end of first air conduction plate 3 and the second air conduction plate 4 is arranged on air cyclone by drainage plate installing plate 5, the unsettled placement of the other end of the first air conduction plate 3 and the second air conduction plate 4.The windward side of described first air conduction plate 3 and the second air conduction plate 4 is respectively arranged with fin-shaped flow deflector 11, and is provided with turbulence structure 12 on the windward side and fin-shaped flow deflector 11 of each air conduction plate.In the present embodiment, described nozzle also comprises support 6, one end of described first air conduction plate 3 and the second air conduction plate 4 is fixed on drainage plate installing plate 5 by support 6, and drainage plate installing plate 5 is fixed on the outside side near combustion chamber center line of air cyclone.
The first air conduction plate 3 and the second air conduction plate 4 windward side on be provided with fin-shaped flow deflector 11, this fin-shaped flow deflector can play guide functions to air; Air conduction plate and fin-shaped flow deflector 11 are provided with turbulence structure 12, turbulence structure 12 in the present embodiment is bowl configurations, but be not limited to pit, also can be the rib of column, projection etc., to increase the turbulivity of air, the thickness of the boundary-layer on effective reduction drainage plate surface, improves the uniformity of air-flow, and reduces flow resistance; The microvariations of turbulence structure 12 generation in addition, allow fuel in the mixing of little whirlpool yardstick, effectively improve the uniformity that fuel mixes with air.
As shown in Fig. 4 a, Fig. 4 b, Fig. 5 a and Fig. 5 b, the lee face of each air conduction plate is all furnished with reinforcement 7, can enlarge markedly the rigidity of air conduction plate, prevents from resonating in the course of work, strengthens its reliability.First air conduction plate 3 and the second air conduction plate 4 are furnished with alignment pin 8 and dowel hole 9 respectively in the side away from support 6, during installation, alignment pin 8 is inserted in dowel hole 9, retrained by alignment pin, prevent the first air conduction plate and the second air conduction plate from staggering, and conveniently detachable.Two air conduction plate other ends are fixed on air cyclone by bolt or alternate manner.
Operation principle of the present invention is as follows: air produces eddy flow through air cyclone 10, air flows from fuel nozzle externally to updrift side, run into after the end cap of end, combustion chamber to center flow, enter fuel nozzle, under the effect of air conduction plate, effectively can reduce the radial velocity of air, make air have more uniform VELOCITY DISTRIBUTION in the axial direction, thus improve mixing of air and fuel.Fuel gas enters fuel gas passageway from suspension flange 2, is sprayed, mix in the region between glass holder 16 with outer tube 1 with rotational flow air by the fuel orifice 18 in fuel spray post 17, produces flame burn in downstream.

Claims (5)

1. a flow guiding structure for combustion chamber premixer fuel nozzle, described nozzle comprises suspension flange (2), outer tube (1), interior pipe (14) and air cyclone (10); Form fuel gas passageway between interior pipe (14) and outer tube (1), interior pipe (14) inside is air duct; Described air cyclone (10) is arranged on the outside of outer tube (1), and is connected with fuel gas passageway; It is characterized in that: described flow guiding structure is arranged on and hangs between flange (2) and air cyclone (10), and this flow guiding structure comprises the first air conduction plate (3), the second air conduction plate (4) and drainage plate installing plate (5); The curved shape in windward side of the first air conduction plate (3) and the second air conduction plate (4); The side of the first air conduction plate (3) and the second air conduction plate (4) is nested on outer tube (1) respectively, and arranges relative to the axisymmetrical of outer tube (1); One end of first air conduction plate (3) and the second air conduction plate (4) is arranged on air cyclone by drainage plate installing plate (5), the unsettled placement of the other end of the first air conduction plate (3) and the second air conduction plate (4);
The windward side of described first air conduction plate (3) and the second air conduction plate (4) is respectively arranged with fin-shaped flow deflector (11), and is provided with turbulence structure (12) on the windward side of each air conduction plate and fin-shaped flow deflector (11).
2. the flow guiding structure of a kind of combustion chamber as claimed in claim 1 premixer fuel nozzle, it is characterized in that, described nozzle also comprises support (6), one end of described first air conduction plate (3) and the second air conduction plate (4) is fixed on drainage plate installing plate (5) by support (6), and drainage plate installing plate (5) is fixed on the outside side near combustion chamber center line of air cyclone.
3. the flow guiding structure of a kind of combustion chamber as claimed in claim 1 premixer fuel nozzle, it is characterized in that, the first described air conduction plate (3) and the lee face of the second air conduction plate (4) are provided with reinforcement (7).
4. the flow guiding structure of a kind of combustion chamber premixer fuel nozzle as described in claim 1,2 or 3, is characterized in that, described turbulence structure (12) is pit, projection or rib of column structure.
5. the flow guiding structure of a kind of combustion chamber as claimed in claim 4 premixer fuel nozzle, it is characterized in that, one end of the first described air conduction plate (3) and the unsettled placement of the second air conduction plate (4) is linked together by alignment pin (8) and dowel hole (9).
CN201510080615.4A 2015-02-13 2015-02-13 A kind of flow guiding structure of combustion chamber premixer fuel nozzle Active CN104654359B (en)

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CN104654359B CN104654359B (en) 2017-12-19

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2534472Y (en) * 2002-04-12 2003-02-05 姜政华 Fine coal powder and natural gas two purpose burner
US20110203294A1 (en) * 2010-02-23 2011-08-25 Snecma Fuel injection system for a combustion chamber of a turbomachine
CN103216848A (en) * 2012-01-18 2013-07-24 通用电气公司 Combustor assembly with impingement sleeve holes and turbulators
CN103528094A (en) * 2013-07-10 2014-01-22 辽宁省燃烧工程技术中心(有限公司) Dry-type low-nitrogen combustion device for gas fuel of gas turbine
CN103759293A (en) * 2009-03-17 2014-04-30 西门子公司 Heat shield element of a heat shield
CN203586283U (en) * 2013-07-10 2014-05-07 辽宁省燃烧工程技术中心(有限公司) Dry-type low-nitrogen combustion device of combustion gas turbine employing gas fuel
US20150027128A1 (en) * 2012-03-15 2015-01-29 Siemens Aktiengesellschaft Heat-shield element for a compressor-air bypass around the combustion chamber
CN204513455U (en) * 2015-02-13 2015-07-29 北京华清燃气轮机与煤气化联合循环工程技术有限公司 The flow guiding structure of a kind of combustion chamber premixer fuel nozzle

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2534472Y (en) * 2002-04-12 2003-02-05 姜政华 Fine coal powder and natural gas two purpose burner
CN103759293A (en) * 2009-03-17 2014-04-30 西门子公司 Heat shield element of a heat shield
US20110203294A1 (en) * 2010-02-23 2011-08-25 Snecma Fuel injection system for a combustion chamber of a turbomachine
CN103216848A (en) * 2012-01-18 2013-07-24 通用电气公司 Combustor assembly with impingement sleeve holes and turbulators
US20150027128A1 (en) * 2012-03-15 2015-01-29 Siemens Aktiengesellschaft Heat-shield element for a compressor-air bypass around the combustion chamber
CN103528094A (en) * 2013-07-10 2014-01-22 辽宁省燃烧工程技术中心(有限公司) Dry-type low-nitrogen combustion device for gas fuel of gas turbine
CN203586283U (en) * 2013-07-10 2014-05-07 辽宁省燃烧工程技术中心(有限公司) Dry-type low-nitrogen combustion device of combustion gas turbine employing gas fuel
CN204513455U (en) * 2015-02-13 2015-07-29 北京华清燃气轮机与煤气化联合循环工程技术有限公司 The flow guiding structure of a kind of combustion chamber premixer fuel nozzle

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Effective date of registration: 20191225

Address after: 102209 Beijing Changping District in the future of the national electric investment group Park in the future science city south of Beijing

Patentee after: China United heavy-duty gas turbine technology Co., Ltd.

Address before: 100084 No. 8, building 1, No. 1001, Zhongguancun East Road, Beijing, Haidian District

Patentee before: Beijing Huatsing Gas Turbine & IGCC Technology Co., Ltd.