CN204438192U - A kind of nozzle and gas turbine - Google Patents

A kind of nozzle and gas turbine Download PDF

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Publication number
CN204438192U
CN204438192U CN201420858238.3U CN201420858238U CN204438192U CN 204438192 U CN204438192 U CN 204438192U CN 201420858238 U CN201420858238 U CN 201420858238U CN 204438192 U CN204438192 U CN 204438192U
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China
Prior art keywords
centerbody
nozzle
fuel
annular
hole
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CN201420858238.3U
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Chinese (zh)
Inventor
付镇柏
张珊珊
查筱晨
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Beijing Huatsing Gas Turbine and IGCC Technology Co Ltd
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Beijing Huatsing Gas Turbine and IGCC Technology Co Ltd
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Abstract

The utility model relates to chain drive technical field, is specifically related to a kind of nozzle and gas turbine.This nozzle comprises centerbody, annular wall and swirl-flow devices; Peripheral hybrid channel is formed between annular wall and centerbody, centerbody inside has centerbody hybrid channel, and on centerbody, be also respectively equipped with independently premixed fuel passage and diffused fuel passage, premixed fuel passage is respectively to centerbody hybrid channel and peripheral hybrid channel burner oil, form fuel-air mixture, diffused fuel passage, directly to the axial burner oil of burner inner liner, finally forms at nozzle exit the flame form that centre is diffusion combustion flame, ectonexine is premixed combustion flame.Under the effect of diffusion combustion, under comparatively underload, flame holding and the efficiency of combustion of nozzle are greatly improved; Meanwhile, owing to mainly improving the structure of nozzle exit, the effect that structure easily processes maintenance can be realized.

Description

A kind of nozzle and gas turbine
Technical field
The utility model relates to chain drive technical field, particularly relates to a kind of nozzle and gas turbine, is specifically related to a kind of nozzle with intermediate course diffusion flame.
Background technology
Along with energy scarcity and the whole world are to the attention of environmental protection problem; the requirement of various countries to gas-turbine combustion chamber discharge and efficiency of combustion is more and more stricter; General Requirements gas turbine is between 50% and above loading zone; combustion chamber discharge can maintain reduced levels, keeps higher efficiency of combustion simultaneously.In order to reach the object of low emission, premixed combustion technology is widely adopted.Therefore, nozzle needs to realize being pre-mixed of fuel and air, and forms the fuel-air mixture mixing and have certain speed type at nozzle exit, and then enters in burner inner liner and participate in burning.
Because the mode of fuel with premixed flame in combustion chamber ejected from nozzle is burnt, for reaching extremely low disposal of pollutants, flame is operated near flammable border, add the fuel-air mixture body effluxvelocity that top nozzle ejects larger, the stable of premixed flame is more difficult, in prior art solution normally centerbody axial length be less than the length in outer nozzle wall face, fuel-air mixture is first expanded to the central area in centerbody head end wall downstream when annular premixed channel flows out, in the formation recirculating zone, central area in centerbody head end wall downstream, then expansion further in the inherent burner inner liner of burner inner liner is entered, and then in burner inner liner, form larger recirculation zone, stablizing for premixed flame, but these two recirculation zone are subject to the influence of other air-flows in burner inner liner, this method be simple from formed stablize recirculating zone air angle to improve the stability of premixed flame, under the duty parameter of larger load, due to inlet pressure, inlet temperature and fuel-air mixture equivalent proportion higher, nozzle still can be easy to realize reliable flame stabilization and higher efficiency of combustion, and compared with under the duty parameter of underload, due to inlet pressure, inlet temperature and fuel-air mixture equivalent proportion lower, be unfavorable for the stable of premixed flame, efficient burning, premixed flame is existed can not stablize or poor stability and the low risk of efficiency of combustion.
In order to improve the stability of flame, in existing patent document (CN1704574), have employed the manufacture shock air contrary with main flow flow direction near jet expansion centerbody to flow, form recirculation eddy current, decrease the air capacity be ejected in recirculating zone, thus effluxvelocity near reduction jet expansion, improve flame holding.This method just improves the stability in local return district from pneumatic angle, only can there is certain effect to the stable of premixed flame, and due to the essence of premixed combustion, this method reliably can not improve the steady fire performance of nozzle, more can not ensure that premixed flame is compared with having higher efficiency of combustion under underload; In addition, from processing technology angle, the structure processing connections such as this premixing nozzle internal layer baffle plate wait comparatively complicated, and are not easy to maintain and replace.
Therefore, for above deficiency, need one to have intermediate course diffusion flame, nozzle and the gas turbine of steady fire performance and efficiency of combustion can be improved.
Utility model content
(1) technical problem that will solve
The technical problems to be solved in the utility model there is provided a kind of nozzle and gas turbine, and this nozzle has intermediate course diffusion flame, can effectively improve steady fire performance and efficiency of combustion.
(2) technical scheme
In order to solve the problems of the technologies described above, the nozzle that the utility model provides comprises centerbody, annular wall and swirl-flow devices, is provided with centerbody hybrid channel in described centerbody; The entrance point of described centerbody hybrid channel is provided with eddy flow orifice plate, and the port of export is provided with head end wall; Described annular wall is coaxially arranged on the periphery of centerbody, between described annular wall and annular wall, form peripheral hybrid channel; Described swirl-flow devices is positioned at the one end near centerbody import on peripheral hybrid channel; Described centerbody is provided with premixed fuel passage and diffused fuel passage; Described premixed fuel passage is communicated with centerbody hybrid channel by centerbody premixed fuel spray-hole; Described head end wall is provided with and exports towards the annular fuel of burner inner liner ignition zone, described annular fuel outlet and diffused fuel channel connection.
Wherein, described diffused fuel passage is by collection chamber and annular fuel outlet.
Wherein, described collection chamber and annular fuel are provided with throttle orifice between exporting.
Wherein, described centerbody hybrid channel is provided with contraction section and centerbody intramedullary expansion section in centerbody, and centerbody intramedullary expansion section is positioned at the downstream of centerbody contraction section.
Wherein, described centerbody is provided with the outer expansion segment of centerbody near one end of head end wall; Described head end wall is provided with end wall spray-hole, and described end wall spray-hole is communicated with peripheral hybrid channel through the outer expansion segment of described centerbody.
Wherein, described centerbody premixed fuel spray-hole and end wall spray-hole are straight hole or inclined hole.
Wherein, the axial location of described head end wall is positioned at the axial range of annular wall.
Wherein, described swirl-flow devices comprises the swirl vane that centrally body circumference is arranged, and is provided with blade interior passage, described blade interior passage is provided with blade premixed fuel spray-hole, described blade interior passage and premixed fuel channel connection in described swirl vane.
Wherein, described eddy flow orifice plate offers multiple tangential hole.
The utility model also provides a kind of gas turbine, and it comprises described nozzle.
(3) beneficial effect
Technique scheme of the present utility model has following beneficial effect: the utility model provides a kind of nozzle, by arranging independently fuel outlet on nozzle head end wall, part of fuel is directly injected into and carries out diffusion combustion into burner inner liner, the form that final formation intermediate course is diffusion combustion flame, ectonexine is premixed combustion flame, the diffusion combustion flame being in jet expansion intermediate course greatly can improve the steady fire performance of nozzle and ensure higher efficiency of combustion.This nozzle arrangements is simple, easily realizes, and not by the restriction of combustion chamber miscellaneous part, the problem such as not to mate.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment nozzle;
Fig. 2 is the close-up schematic view of the utility model embodiment jet expansion;
Fig. 3 is the front schematic view of the utility model embodiment jet expansion;
Fig. 4 is the stereogram of the utility model embodiment nozzle;
Fig. 5 is the using state schematic diagram of the utility model embodiment nozzle.
Wherein, 1: centerbody; 2: annular wall; 3: swirl-flow devices; 4: swirl vane; 5: head end wall; 6: eddy flow orifice plate; 7: tangential hole; 8: premixed fuel passage; 9: blade interior passage; 10: blade premixed fuel spray-hole; 11: premixed fuel vias inner walls face; 12: centerbody premixed fuel spray-hole; 13: diffused fuel passage; 14: collection chamber; 15: throttle orifice; 16: annular fuel exports; 17: end wall spray-hole; 18: the outer expansion segment of centerbody; 19: contraction section in centerbody; 20: centerbody intramedullary expansion section; 21: centerbody hybrid channel venturi; 22: centerbody hybrid channel; 23: peripheral hybrid channel; 24: center premixed flame; 25: intermediate course diffusion flame; 26: peripheral premixed flame.
Detailed description of the invention
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples for illustration of the utility model, but can not be used for limiting scope of the present utility model.
In description of the present utility model, except as otherwise noted, the implication of " multiple " is two or more; Term " on ", D score, "left", "right", " interior ", " outward ", " front end ", " rear end ", " head ", the orientation of the instruction such as " afterbody " or position relationship be based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of the device of instruction or hint indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.In addition, term " first ", " second ", " the 3rd " etc. only for describing object, and can not be interpreted as instruction or hint relative importance.
In description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, term " is connected ", " connection " should be interpreted broadly, such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary.For the ordinary skill in the art, concrete condition the concrete meaning of above-mentioned term in the utility model can be understood.
As Figure 1-5, the nozzle of the present embodiment comprises centerbody 1, annular wall 2 and swirl-flow devices 3, is provided with centerbody hybrid channel 22 in centerbody 1; The entrance point of centerbody hybrid channel 22 is provided with eddy flow orifice plate 6, and centerbody hybrid channel 22 port of export is provided with head end wall 5; Annular wall 2 is coaxially arranged on the periphery of centerbody 1, and between annular wall 2 and annular wall 2, form peripheral hybrid channel 23; Swirl-flow devices 3 is positioned at the one end near centerbody 1 import on peripheral hybrid channel 23, for generation of rotational flow air; And centerbody 1 is provided with independently premixed fuel passage 8 and diffused fuel passage 13; Premixed fuel passage 8 is communicated with centerbody hybrid channel 22 by centerbody premixed fuel spray-hole 12; Head end wall 5 is provided with towards the annular fuel outlet 16 of burner inner liner ignition zone, annular fuel outlet 16 is communicated with diffused fuel passage 13, part of fuel is directly injected into and carries out diffusion combustion into burner inner liner, and the inside and outside radial space of the fuel outlet of diffusion combustion is the outlet of fuel-air mixture, the form that final formation intermediate course is diffusion combustion flame, ectonexine is premixed combustion flame.The diffusion combustion flame being in jet expansion intermediate course greatly can improve the steady fire performance of nozzle and ensure higher efficiency of combustion.
As shown in Figure 2, diffused fuel passage 13 exports 16 by collection chamber 14 with annular fuel and is communicated with.Wherein, the axis being oriented nozzle of annular fuel outlet 16, that is, towards burner inner liner ignition zone.And, export the throttle orifice 15 being provided with between 16 and can controlling fuel flow rate at collection chamber 14 and annular fuel, play the jet velocity reducing fuel, make the effect that intermediate course diffusion flame 25 is more stable.
And, centerbody hybrid channel 22 is provided with contraction section 19 and centerbody intramedullary expansion section 20 in centerbody, and centerbody intramedullary expansion section 20 is positioned at the downstream of centerbody contraction section 19.In centerbody, contraction section 19 can improve the jet velocity of fuel-air mixture, and in centerbody hybrid channel, venturi 21 place reaches maximum, and centerbody hybrid channel venturi 21 can prevent center premixed flame 24 to tempering in centerbody hybrid channel 22; Centerbody intramedullary expansion section 20 can carry out water conservancy diversion to fuel-air mixture, makes fuel-air mixture not easily occur be separated and easily ignited by intermediate course diffusion flame 25.
Meanwhile, centerbody 1 is provided with the outer expansion segment 18 of centerbody near one end of head end wall 5; Head end wall 5 is provided with end wall spray-hole 17, and this end wall spray-hole 17 is communicated with peripheral hybrid channel 23 through the outer expansion segment 18 of centerbody, part of fuel air Mixture can be sprayed from end wall spray-hole 17, have certain cooling effect by head end wall 6.
Shown in composition graphs 3, Fig. 4, centerbody premixed fuel spray-hole 12 and end wall spray-hole 17 are straight hole or inclined hole.Wherein, straight hole is the through hole offered vertically, inclined hole is the through hole offered with the direction vector of radial direction vertically, simultaneously, centerbody premixed fuel spray-hole 12 and end wall spray-hole 17 also for the tangential hole for making fuel be rotated through, certainly, can also can be the hole of other types, such as, bellmouth etc.
In the present embodiment, the axial location of head end wall 5 is in the axial range of annular wall 2, and namely head end wall 5 is within the coated scope of annular wall 2.
Wherein, swirl-flow devices 3 comprises the swirl vane 4 that centrally body 1 circumference is arranged, and be provided with blade interior passage 9 in swirl vane 4, blade interior passage 9 is provided with blade premixed fuel spray-hole 10, blade interior passage 9 is communicated with premixed fuel passage 8.
And, eddy flow orifice plate 6 is offered multiple tangential hole 7, for generation of eddy flow.
In addition, the utility model provides a kind of gas turbine, and it comprises described nozzle.
Operation principle of the present utility model is as follows: first, extraneous air forms eddy flow respectively by swirl-flow devices 3 and eddy flow orifice plate 6 and enters peripheral hybrid channel 23 and centerbody hybrid channel 22, fuel enters blade interior passage 9 and centerbody premixed fuel spray-hole 12 respectively by premixed fuel passage 8, part fuel is by spraying in the blade premixed fuel spray-hole 10 on blade interior passage 9 to the periphery hybrid channel 23 and mixing with air, another part fuel is sprayed by centerbody premixed fuel spray-hole 12 and mixes with air in centerbody hybrid channel 22.
Independently diffused fuel passage 13 is had in centerbody 1, diffused fuel passage 13 downstream has collection chamber 14, collection chamber 14 downstream has throttle orifice 15, the head end wall 6 of centerbody 1 has annular fuel outlet 16, and be communicated with diffused fuel passage 13 by throttle orifice 15, fuel can be directly injected into and in burner inner liner, diffusion combustion occur, form intermediate course diffusion flame 25; The object that the downstream of throttle orifice 15 is provided with annular fuel outlet 16 is the jet velocity in order to reduce fuel, makes intermediate course diffusion flame 25 more stable.
Inside, centerbody hybrid channel 22 is provided with contraction section 19 in centerbody, centerbody intramedullary expansion section 20, and centerbody intramedullary expansion section 20 contraction section 19 downstream in centerbody, namely centerbody hybrid channel 22 is contraction-expanding channel; Form centerbody hybrid channel venturi 21 between contraction section 19, centerbody intramedullary expansion section 20 in centerbody, the fuel-air mixture ejected from centerbody hybrid channel 22 is ignited by intermediate course diffusion flame 25, forms center premixed flame 24; In centerbody in centerbody hybrid channel 22, contraction section 19 can improve the jet velocity of fuel-air mixture, in centerbody hybrid channel, venturi 21 place reaches maximum, and centerbody hybrid channel venturi 21 can prevent center premixed flame 24 to tempering in centerbody hybrid channel 22; Centerbody intramedullary expansion section 20 can carry out water conservancy diversion to fuel-air mixture, makes fuel-air mixture not easily occur be separated and easily ignited by intermediate course diffusion flame 25.Between the fuel-air mixture quilt that peripheral hybrid channel 23 is sprayed, interlayer diffusion flame 25 ignites, and forms peripheral premixed flame 26; Centerbody 1 is provided with the outer expansion segment 18 of centerbody in head end wall 6 upstream, can improve the jet velocity of fuel-air mixture, can prevent the tempering in hybrid channel 23 to the periphery of peripheral premixed flame 26.
Head end wall 6 has end wall spray-hole 17, end wall spray-hole 17 is communicated with peripheral hybrid channel 23 by the outer expansion segment 18 of centerbody, and part of fuel air Mixture is sprayed from end wall spray-hole 17, has certain cooling effect by head end wall 6.
As shown in Figure 5, the final effect formed is the centre of jet expansion is diffusion combustion flame, and ectonexine is premixed combustion flame, and under the effect of diffusion combustion, under comparatively underload, flame holding and the efficiency of combustion of nozzle are greatly improved; Along with the rising of load, due to the increase of inlet temperature, inlet temperature and fuel-air mixture equivalent proportion, stability and the efficiency of combustion of premixed flame reach higher level, and in order to reach lower discharge, now can close diffused fuel passage 13, only have premixed fuel passage 8 to supply fuel, nozzle adopts the pattern of full premix combustion.
In sum, the utility model provides a kind of nozzle, by arranging independently fuel outlet on nozzle head end wall, part of fuel is directly injected into and carries out diffusion combustion into burner inner liner, the form that final formation intermediate course is diffusion combustion flame, ectonexine is premixed combustion flame, the diffusion combustion flame being in jet expansion intermediate course greatly can improve the steady fire performance of nozzle and ensure higher efficiency of combustion.This nozzle arrangements is simple, easily realizes, and not by the restriction of combustion chamber miscellaneous part, the problem such as not to mate.
Embodiment of the present utility model provides for the purpose of example and description, and is not exhaustively or by the utility model be limited to disclosed form.Many modifications and variations are apparent for the ordinary skill in the art.Selecting and describing embodiment is in order to principle of the present utility model and practical application are better described, and enables those of ordinary skill in the art understand the utility model thus design the various embodiments with various amendment being suitable for special-purpose.

Claims (10)

1. a nozzle, comprises centerbody (1), annular wall (2) and swirl-flow devices (3), is provided with centerbody hybrid channel (22) in described centerbody (1); The entrance point of described centerbody hybrid channel (22) is provided with eddy flow orifice plate (6), and the port of export is provided with head end wall (5); Described annular wall (2) is coaxially arranged on the periphery of centerbody (1), forms peripheral hybrid channel (23) between described annular wall (2) and annular wall (2); Described swirl-flow devices (3) is positioned at upper one end near centerbody (1) import, peripheral hybrid channel (23); It is characterized in that: described centerbody (1) is provided with premixed fuel passage (8) and diffused fuel passage (13); Described premixed fuel passage (8) is communicated with centerbody hybrid channel (22) by centerbody premixed fuel spray-hole (12); Described head end wall (5) is provided with and exports (16) towards the annular fuel of burner inner liner ignition zone, and described annular fuel outlet (16) is communicated with diffused fuel passage (13).
2. nozzle according to claim 1, is characterized in that, described diffused fuel passage (13) exports (16) by collection chamber (14) with annular fuel and is communicated with.
3. nozzle according to claim 2, is characterized in that, described collection chamber (14) and annular fuel export between (16) and be provided with throttle orifice (15).
4. nozzle according to claim 1, it is characterized in that, described centerbody hybrid channel (22) is provided with contraction section in centerbody (19) and centerbody intramedullary expansion section (20), and centerbody intramedullary expansion section (20) is positioned at the downstream of centerbody contraction section (19).
5. nozzle according to claim 1, is characterized in that, the upper one end near head end wall (5) of described centerbody (1) is provided with the outer expansion segment (18) of centerbody; Described head end wall (5) is provided with end wall spray-hole (17), and described end wall spray-hole (17) is communicated with peripheral hybrid channel (23) through the outer expansion segment (18) of described centerbody.
6. nozzle according to claim 5, is characterized in that, described centerbody premixed fuel spray-hole (12) and end wall spray-hole (17) are straight hole or inclined hole.
7. nozzle according to claim 1, is characterized in that, the axial location of described head end wall (5) is positioned at the axial range of annular wall (2).
8. nozzle according to claim 1, it is characterized in that, described swirl-flow devices (3) comprises the swirl vane (4) that centrally body (1) circumference is arranged, blade interior passage (9) is provided with in described swirl vane (4), described blade interior passage (9) is provided with blade premixed fuel spray-hole (10), and described blade interior passage (9) is communicated with premixed fuel passage (8).
9. nozzle according to claim 1, is characterized in that, described eddy flow orifice plate (6) offers multiple tangential hole (7).
10. a gas turbine, is characterized in that, comprises nozzle as claimed in any one of claims 1-9 wherein.
CN201420858238.3U 2014-12-30 2014-12-30 A kind of nozzle and gas turbine Active CN204438192U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104566472A (en) * 2014-12-30 2015-04-29 北京华清燃气轮机与煤气化联合循环工程技术有限公司 Spray nozzle and gas turbine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104566472A (en) * 2014-12-30 2015-04-29 北京华清燃气轮机与煤气化联合循环工程技术有限公司 Spray nozzle and gas turbine
CN104566472B (en) * 2014-12-30 2018-06-05 北京华清燃气轮机与煤气化联合循环工程技术有限公司 A kind of nozzle and gas turbine

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C14 Grant of patent or utility model
GR01 Patent grant
PLDC Enforcement, change and cancellation of contracts on pledge of patent right or utility model
PE01 Entry into force of the registration of the contract for pledge of patent right

Denomination of utility model: Spray nozzle and gas turbine

Effective date of registration: 20161104

Granted publication date: 20150701

Pledgee: Tsinghua Holdings Co., Ltd.

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

Registration number: 2016990000853

PC01 Cancellation of the registration of the contract for pledge of patent right
PC01 Cancellation of the registration of the contract for pledge of patent right

Date of cancellation: 20171115

Granted publication date: 20150701

Pledgee: Tsinghua Holdings Co., Ltd.

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

Registration number: 2016990000853

PC01 Cancellation of the registration of the contract for pledge of patent right
PC01 Cancellation of the registration of the contract for pledge of patent right

Date of cancellation: 20191211

Granted publication date: 20150701

Pledgee: Tsinghua Holdings Co., Ltd.

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

Registration number: 2016990000853