CN204404238U - A kind of fuel-air blender with step centerbody - Google Patents

A kind of fuel-air blender with step centerbody Download PDF

Info

Publication number
CN204404238U
CN204404238U CN201420850191.6U CN201420850191U CN204404238U CN 204404238 U CN204404238 U CN 204404238U CN 201420850191 U CN201420850191 U CN 201420850191U CN 204404238 U CN204404238 U CN 204404238U
Authority
CN
China
Prior art keywords
centerbody
fuel
blender
air
converging transition
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.)
Withdrawn - After Issue
Application number
CN201420850191.6U
Other languages
Chinese (zh)
Inventor
付镇柏
查筱晨
张珊珊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing Huatsing Gas Turbine and IGCC Technology Co Ltd
Original Assignee
Beijing Huatsing Gas Turbine and IGCC Technology Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Beijing Huatsing Gas Turbine and IGCC Technology Co Ltd filed Critical Beijing Huatsing Gas Turbine and IGCC Technology Co Ltd
Priority to CN201420850191.6U priority Critical patent/CN204404238U/en
Application granted granted Critical
Publication of CN204404238U publication Critical patent/CN204404238U/en
Withdrawn - After Issue legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

There is a fuel-air blender for step centerbody, belong to gas turbine structure design field.Described blender comprises centerbody, annular fuel air duct, swirl-flow devices and is arranged on the center air spray-hole of centerbody end; The tract of described centerbody is step-like converging transition, and the outside wall surface of this step-like converging transition and described annular fuel air duct forms channels expending; This channels expending the region of the sudden expansion section of heart body end upstream in a mixer can form little recirculating zone, local, thus improves the steady fire performance of blender; Simultaneously owing to being improve the structure of mixer center body, under the prerequisite that blender overall dimension does not increase, achieve the effect that structure easily processes maintenance, and save the radial installing space of blender.

Description

A kind of fuel-air blender with step centerbody
Technical field
The utility model relates to the chamber structure of gas turbine, more specifically relates to a kind of chamber fuel air mixer, belongs to gas turbine structure design field.
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, need to realize the device that fuel and air are pre-mixed, i.e. fuel-air blender, and form the fuel-air mixture mixing and have certain speed type at mixer outlet place, and then enter in burner inner liner and participate in burning.
Because the mode of fuel with premixed flame in combustion chamber ejected from fuel-air blender is burnt, for reaching extremely low disposal of pollutants, flame is operated near flammable border, add that the fuel-air mixture body effluxvelocity that blender ejects is larger, the stable of flame is more difficult, in prior art solution normally centerbody axial length be less than the length of fuel-air blender outside wall surface, fuel-air mixture body 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 flame, but these two recirculation zone are subject to the influence of other air-flows in burner inner liner, flame is existed can not stablize or the risk of poor stability.
In order to improve the stability of flame, in existing Chinese patent literature CN1704574, have employed the manufacture shock air contrary with main flow flow direction near mixer outlet centerbody to flow, form recirculation eddy current, decrease the air capacity be ejected in recirculating zone, thus effluxvelocity near reduction mixer outlet, improve flame holding.And the structure processing connections such as this blender internal layer baffle plate wait comparatively complicated, and be not easy to maintain and replace, and recycle eddy current and be not easy to control, be likely difficult to solve flame stability problems.
Utility model content
For the deficiencies in the prior art and defect, the purpose of this utility model is to provide the gas turbine fuel air mixer of step centerbody, be intended to the steady fire performance improving blender further, there is structure simple and be convenient to process the feature of maintenance simultaneously.
The technical scheme that the utility model adopts is as follows:
A kind of fuel-air blender with step centerbody, containing centerbody and the annular fuel air duct coaxially arranged with centerbody, swirl-flow devices is provided with in described annular fuel air duct, central air passage is provided with in centerbody, centerbody end is provided with center air spray-hole, it is characterized in that: the tract of described centerbody is step-like converging transition, and the outside wall surface of this step-like converging transition and described annular fuel air duct forms channels expending.
In technique scheme, centered by the length of described step-like converging transition body length 10% ~ 30%.
Preferably, the step-like converging transition of described centerbody tract has 2 ~ 5 steps.
Technical characteristic of the present utility model is not also: described step-like converging transition is provided with centerbody sidewall Cooling Holes, and described centerbody sidewall Cooling Holes is a kind of in axial Cooling Holes, radial cooling hole and inclined cooling plate hole or their combination.
This utility model compared with prior art, have the following advantages and high-lighting effect: 1. owing to being provided with step-tapers structure at the tract of centerbody, the outside wall surface of this step-like converging transition and annular fuel air duct forms channels expending, when fuel-air mixture is in the process flowed to centerbody end direction, channels expending can be flowed through, this channels expending makes mixed airflow slow down suddenly, therefore can be formed at channels expending place local, independently, stable channels expending recirculating zone, little recirculating zone, this local effectively improves the steady fire performance of blender.2. owing to being carry out structure improvement to the inner centre body of blender, the overall dimension of blender can not be increased, ensure that blender directly can be installed in original space, and have structure simple, be convenient to the advantages such as processing maintenance.
Accompanying drawing explanation
The structural principle schematic diagram with the fuel-air blender of step centerbody that Fig. 1 provides for the utility model.
Fig. 2 is three-dimensional structure schematic diagram of the present utility model.
Fig. 3 is pneumatic principle schematic diagram of the present utility model.
In figure, symbol description is as follows:
1-centerbody; 2-annular fuel air duct; 3-swirl-flow devices; 4-centerbody end; 5-center air spray-hole; The step-like converging transition of 6-; 7-channels expending; 8-centerbody sidewall Cooling Holes; 9-central air passage; 10-hollow swirl vane; 11-teasehole; 12-annular fuel passage; 13-channels expending recirculating zone; 14-centerbody sudden expansion recirculating zone; 15-burner inner liner sudden expansion recirculating zone.
Detailed description of the invention
Below in conjunction with accompanying drawing, principle of the present utility model, structure and detailed description of the invention are described further.
A kind of structural principle schematic diagram with the fuel-air blender of step centerbody that Fig. 1 provides for the utility model, this fuel-air blender comprises centerbody 1, annular fuel air duct 2 and swirl-flow devices 3; The inside of centerbody 1 is provided with central air passage 9 and annular fuel passage 12, and the end of centerbody 1 is provided with center air spray-hole 5; Annular fuel air duct 2 is coaxially arranged with centerbody 1; Swirl-flow devices 3 comprises the hollow swirl vane 10 that circumference is arranged, and hollow swirl vane is provided with teasehole 11, and annular fuel passage 12 is connected with teasehole.
The tract of centerbody 1 of the present utility model is step-like converging transition 6, and the outside wall surface of this step-like converging transition and described annular fuel air duct forms channels expending 7; The length of step-like converging transition 6 is preferably 10% ~ 30% of central body length.The step-like converging transition of described centerbody tract preferably has 2 ~ 5 steps.Step-like converging transition 6 is provided with centerbody sidewall Cooling Holes 8; Central air passage 9 is connected by described centerbody sidewall Cooling Holes 8 with channels expending 7.The form of centerbody sidewall Cooling Holes 8 can be axial Cooling Holes or radial cooling hole, also can be the combining form in axial Cooling Holes, radial cooling hole and inclined cooling plate hole.
Operation principle of the present utility model is as follows:
The space that air is limited by centerbody 1 and annular wall 2 flows to internal mixer, and forms the air-flow of rotational flow through swirl-flow devices 3; Fuel gas enters hollow swirl vane 10 from fuel channel 12, and spouting from the teasehole 11 of hollow swirl vane 10 setting; The position mixing residing for swirl-flow devices 3 of air and fuel gas, fuel-air mixture is in the process flowed to centerbody end 4 direction, the channels expending 7 that the outside wall surface that can flow through step-like converging transition and annular fuel air duct is formed, channels expending 7 makes mixed airflow slow down suddenly, formed at channels expending 7 place local, independently, stable channels expending recirculating zone 13, and channels expending recirculating zone 13 is not subject to the impact of other air-flows in the burner inner liner of downstream, contribute to the reliability improving flame stabilization; Because air-flow is expanded in centerbody 1 centerbody end 4 downstream, centerbody sudden expansion recirculating zone 14 can be formed in the central area in centerbody end 4 downstream; After air-flow enters burner inner liner from blender, larger burner inner liner sudden expansion recirculating zone 15 can be formed in burner inner liner, under the acting in conjunction of channels expending recirculating zone 13, centerbody sudden expansion recirculating zone 14, burner inner liner sudden expansion recirculating zone 15, finally achieve reliable and stable combustion flame (see Fig. 3); Simultaneously, the centerbody sidewall Cooling Holes 8 that the center air spray-hole 5 that centerbody end 4 is offered and step-like converging transition 6 are offered, refrigerating gas is had to flow out, to reach the cooling effect to wall herein, and this cooling blast can not have obvious destruction to ensure stable recirculation zone to neighbouring recirculating zone.

Claims (4)

1. one kind has the fuel-air blender of step centerbody, containing centerbody (1) and the annular fuel air duct (2) coaxially arranged with centerbody (1), swirl-flow devices (3) is provided with in described annular fuel air duct (2), central air passage (9) is provided with in centerbody, centerbody end is provided with center air spray-hole (5), it is characterized in that: the tract of described centerbody (1) is step-like converging transition (6), the outside wall surface of this step-like converging transition and described annular fuel air duct forms channels expending (7).
2. a kind of fuel-air blender with step centerbody as claimed in claim 1, is characterized in that: centered by the length of described step-like converging transition (6) body (1) length 10% ~ 30%.
3. a kind of fuel-air blender with step centerbody as claimed in claim 1 or 2, is characterized in that: the step-like converging transition (6) of described centerbody (1) tract has 2 ~ 5 steps.
4. a kind of fuel-air blender with step centerbody as claimed in claim 3, it is characterized in that: described step-like converging transition (6) is provided with centerbody sidewall Cooling Holes (8), described centerbody sidewall Cooling Holes is a kind of in axial Cooling Holes, radial cooling hole and inclined cooling plate hole or their combination.
CN201420850191.6U 2014-12-26 2014-12-26 A kind of fuel-air blender with step centerbody Withdrawn - After Issue CN204404238U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420850191.6U CN204404238U (en) 2014-12-26 2014-12-26 A kind of fuel-air blender with step centerbody

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420850191.6U CN204404238U (en) 2014-12-26 2014-12-26 A kind of fuel-air blender with step centerbody

Publications (1)

Publication Number Publication Date
CN204404238U true CN204404238U (en) 2015-06-17

Family

ID=53428090

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201420850191.6U Withdrawn - After Issue CN204404238U (en) 2014-12-26 2014-12-26 A kind of fuel-air blender with step centerbody

Country Status (1)

Country Link
CN (1) CN204404238U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104566461A (en) * 2014-12-26 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 Fuel-air mixer with stepped central body
CN109780572A (en) * 2019-01-09 2019-05-21 南京航空航天大学 A kind of the combination flameholder and its working method of adjustable cavity whirlpool plot structure

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104566461A (en) * 2014-12-26 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 Fuel-air mixer with stepped central body
CN104566461B (en) * 2014-12-26 2017-09-01 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 fuel-air mixer with step centerbody
CN109780572A (en) * 2019-01-09 2019-05-21 南京航空航天大学 A kind of the combination flameholder and its working method of adjustable cavity whirlpool plot structure

Similar Documents

Publication Publication Date Title
CN105674330B (en) A kind of ground gas turbine can burner device
CN204165044U (en) The premixed coal dust low NO of a kind of adverse current
CN103615717A (en) Novel oxygen enrichment tiny-oil ignition and ultralow load stable-combustion combustor
CN104566471B (en) A kind of nozzle and the gas turbine provided with the nozzle
CN204404238U (en) A kind of fuel-air blender with step centerbody
CN104566460A (en) Fuel and air mixer with sudden-expansion channel
CN104110698A (en) Pre-mixing nozzle used for combustion gas turbine combustor
CN206247331U (en) One kind classification combustion gas low NO
CN102537951B (en) Central diffusion type tiny-oil ignition combustor
CN103629663B (en) Vortex burner
CN204880218U (en) Gas turbine is mixing nozzle and gas turbine in advance
CN205939136U (en) Novel low nitrogen oxide burner structure
CN204404239U (en) A kind of fuel-air blender with channels expending
CN204084467U (en) The swirl nozzle that the axial two-stage direction of gas-turbine combustion chamber is contrary
CN201885229U (en) Low-emission high-power sectionalized combustion gas burner
CN104566472B (en) A kind of nozzle and gas turbine
CN204227464U (en) A kind of gas-turbine combustion chamber centerbody fluting swirl nozzle
CN104566461B (en) A kind of fuel-air mixer with step centerbody
CN204438195U (en) A kind of fuel-air blender and gas turbine
CN204438193U (en) A kind of nozzle and be provided with the gas turbine of this nozzle
CN212227021U (en) Low-nitrogen combustor
CN204438184U (en) A kind of premixing nozzle and gas turbine
CN107062226A (en) A kind of big backflow low NO of high-temperature flue gas
CN204006117U (en) A kind of pre-mixing nozzle for gas-turbine combustion chamber
CN204006119U (en) The pre-mixing nozzle that a kind of gas turbine is used

Legal Events

Date Code Title Description
GR01 Patent grant
C14 Grant of patent or utility model
AV01 Patent right actively abandoned

Granted publication date: 20150617

Effective date of abandoning: 20170901

AV01 Patent right actively abandoned