CN102721082A - Cracking-gas fuel injection device for chemical regenerative cycle - Google Patents
Cracking-gas fuel injection device for chemical regenerative cycle Download PDFInfo
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- CN102721082A CN102721082A CN2012102132398A CN201210213239A CN102721082A CN 102721082 A CN102721082 A CN 102721082A CN 2012102132398 A CN2012102132398 A CN 2012102132398A CN 201210213239 A CN201210213239 A CN 201210213239A CN 102721082 A CN102721082 A CN 102721082A
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- swirl vane
- wheel hub
- cracking gas
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- gas fuel
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Abstract
The invention aims at providing a cracking-gas fuel injection device for chemical regenerative cycle, comprising an inner hub, a middle hub, an outer hub, inner-stage swirl vanes, outer-stage swirl vanes and a center body cap hood, wherein the inner-stage swirl vanes are arranged between the inner hub and the middle hub; the outer-stage swirl vanes are arranged between the middle hub and the outer hub; a central through hole is arranged in the inner hub; a fuel feeding channel is formed between the inner hub and the central through hole and is closed by the center body cap hood; the inner hub is provided with an inlet channel of cracking gas fuel; the middle hub is provided with a cracking gas ring cavity; a spraying nozzle is arranged at the end part of the cracking gas ring cavity; a divergent channel is formed by the inner-stage swirl vanes and the outer-stage swirl vanes; and gas sprayed from the spraying nozzle enters a combustion chamber through the divergent channel. The cracking-gas fuel injection device provided by the invention has the advantages that the cracking gas fuel and air can be well mixed, so that the length of flame is further shortened, the length of the combustion chamber can be shortened, and further the structure of a gas turbine becomes compact.
Description
Technical field
What the present invention relates to is a kind of gas turbine, specifically the fuel injection device of gas turbine.
Background technology
Along with development of technology, people are also increasingly high to the requirement of gas turbine performance.In order to improve the performance of combustion machine, many advanced persons' endless form is constantly proposed, and wherein the chemical back heating circulation is a kind of advanced endless form.The essential bifuel system that adopts in its combustion chamber of working method decision of chemical back heating cycle combustion turbine CRGT, the centrifugal atomizing nozzle is generally adopted in the injection of liquid fuel, and the mixing of fuel gas then is one of difficult point.
Along with the further attention of countries in the world to environmental protection, gas turbine can be turned round efficiently, and a series of pollutions that can reduce in the course of the work to be produced, be the target that the designer asks most.Combustion chamber for burning conventional hydrocarbon-based fuel; Nitrogen oxide is an important pollutant wherein, and if can control the maximum temperature of combustion process, just can control the quantity of this pollutant; But prerequisite is that fuel and air are carried out poor mixed combustion; The excess air that has neither part nor lot in reaction absorbs the heat that burning produces, thereby the temperature of burning is reduced to the level that can not form nitrogen oxide in a large number, thereby realizes low emission.
Already present certain methods is following in this field: the method for Crossed Circle contrarotating cyclone fuel injector DACRS has a lot of application in design; This method can form stronger shearing flow field and turbulent flow flow field, can produce the good mixing characteristic such as United States Patent(USP) No. 5165241, No.5251447,5351477, No.5599529, No.5638682, No.5680766.These designs can not produce powerful recirculation zone on the center line of combustion zone, can not smooth combustions, and the not premixed fuel that replenishes in order to address this problem with the temperature that improves burning greatly, has been offset in order to reduce the effort that pollution is done.Though the DACRS technology is a technology used for a long time,, thereby also has very big room for promotion because design in the past can't solve the problem of Stability of Premixed.
And in engineering, also have a kind of method relatively more commonly used, and being about to the premixed fuel burner and merging between swirler blades or its lip-deep fuel nozzle device, these modes of laterally injecting can cause the height of combustion chamber fuel concentration inhomogeneous; Too high in some position temperature; Produce focus, low excessively at some position fuel concentrations, cause flame-out; This in addition lateral flow is injected the fluctuation that also can cause combustion process, needs designer's design further to improve.
In the organizational process of Combustion Flow Field, also often utilize a kind of Coanda effect to carry out the design of nozzle.This is the phenomenon in a kind of hydrodynamics, and the gas that promptly from nozzle, flows out changes into along with the mobile tendency of the body surface of protrusion from leaving original flow direction.When having mantle friction between the body surface that fluid and it are flow through, flow rate of fluid can slow down.As long as the curvature of body surface is not too big; According to the bernoulli principle in the hydrodynamics; The slowing down of flow velocity can cause fluid to be attracted on the body surface flowing; At this moment the object surfaces convection cell will produce guide effect, in the design is exactly to utilize this point to come traditional design is carried out certain improved.
In patent CN 101153558A, the General Corporation of the U.S. has adopted a kind of annular array injection apparatus that makes the special-shaped fuel of coanda spray fin, adopts this structure so that Coanda effect to be provided in the design, can realize effective fuel premix smooth combustion.Yet what use in this patent is that fuel nozzle ports is designed on some profiled blade; Such blade production cost can be than higher, and structure also can more complicated, and in other patents; A such as gondola patent application CN100447432C; This patent is used Coanda effect cleverly, adopts very two moving element structures, has just realized that the Three Degree Of Freedom of air-flow is regulated.Among the patent application CN101135442B of U.S. John Zink Company LLC, adopt the Coanda effect surface in the exit of boiler, be used to promote the formation in fractional combustion district.Coanda effect is more succinct airflow direction regulating measure, though be used for many years, really seldom uses in the design of gas-turbine combustion chamber.Some patents of General Electric Co. Limited in CN 101201176A, have been used Coanda effect a kind of loading in mixture in putting, and are used for regulating the structure of the throat of contraction-expansion pipeline, regulate air-flow and the mix of fuel under the different operating modes.But do not have the swirl vane structure in this structure, the shearing flow field that swirl vane can not produced is applied in the fuel mix of head of combustion chamber and goes.
Summary of the invention
The object of the present invention is to provide a kind of cracking gas fuel injection device that is used for the chemical back heating circulation that is applied in the gas turbine chemical back heating circulating combustion chamber.
The objective of the invention is to realize like this:
A kind of cracking gas fuel injection device that is used for the chemical back heating circulation of the present invention is characterized in that: comprise inner wheel hub, middle wheel hub, outer wheel hub, interior level swirl vane, outer level swirl vane, centerbody calotte, interior level swirl vane is installed between inner wheel hub and the middle wheel hub; Outer level swirl vane is installed between middle wheel hub and the outer wheel hub; Center through hole is set in the inner wheel hub, forms fuel between inner wheel hub and the center through hole and infeed passage, the centerbody calotte infeeds the passage sealing with fuel; The intake channel of cracking gas fuel is set on the inner wheel hub; On the middle wheel hub cracking gas ring cavity is set, intake channel is communicated with the cracking gas ring cavity, and cracking gas ring cavity end is a nozzle; Interior level swirl vane and outer level swirl vane formation flaring passage, the gas that from nozzle, sprays gets into the combustion chamber through the flaring passage.
The present invention can also comprise:
1, described interior level swirl vane is different with the eddy flow direction of outer level swirl vane.
2, described nozzle reaches nozzle for the Koln that outlet is the bluff body shape up and down.
3, the radial height of described outer grade swirl vane is greater than interior level swirl vane, grade swirl vane in the axial length of outer grade swirl vane is longer than.
Advantage of the present invention is:
1, the present invention can be good at mixed pyrolysis gas fuel and air, makes the length of flame further shorten, and so just makes the shortening of combustion chamber length become possibility, thereby further makes gas turbine structure be tending towards compact.
2, the size of the outer level of the present invention cyclone is bigger; Can bear the effect of flow field, downstream tissue; Improve the stability of burning, overcome the combustion instability that exists in traditional DACRS design, be difficult for forming stable recirculating zone, needed to replenish other structures and meet the requirements of deficiency.
3, the design of coanda type fuel nozzle among the present invention; Compare directly cracking gas is infeeded the mode in the high velocity air; Can prevent effectively that fuel from spraying the flow field fluctuation that brings in the mixing; Make steadily premix of cracking gas fuel and air,, and do not cause tangible boundary layer separation to flow with the uniform fuel gas mixture of shape.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a cutaway view of the present invention;
Fig. 3 is the slice location sketch map of Fig. 2;
Fig. 4 partly cuts open figure for of the present invention overlooking;
Fig. 5 partly cuts open the slice location sketch map of figure for Fig. 4;
Fig. 6 looks the sketch map that partly cuts open figure for a left side of the present invention.
The specific embodiment
For example the present invention is done description in more detail below in conjunction with accompanying drawing:
In conjunction with Fig. 1～6, this cyclone comprises that fuel infeeds passage 1, gas passage 2 in the blade, cyclone outer wheel hub 3; Flaring passage 4, interior level swirl vane 5, centerbody calotte 6; Center through hole 7, coanda nozzle 8, swirler blades 9; Cracking gas ring cavity 10, wheel hub 11 in the cyclone, cyclone inner wheel hub 12.Comprise that in addition cracking gas fuel flows to profile 13 and flaring passage cardinal principle profile 14.
Fig. 1 and Fig. 2 illustrated together the operation principle of this cracking gas fuel annular jet; Cracking gas at first infeeds passage 1 through fuel and gets in the nozzle; After running into the stopping of centerbody calotte 6; Get in the cracking gas ring cavity 10 through leaf gas passage 2, carry out certain current stabilization, eject through coanda nozzle 8 again.Air is through interior level swirl vane 5 and outer level swirl vane 9 entering combustion chambers.Because the eddy flow direction of blade is different, make to exist the different annular airflow of direction of rotation at the blade exit place.The blade that is adopted in swirl vane and the common design is different; Outer level swirl vane 9 and interior level swirl vane 5 and middle wheel hub 11 near an end length shorter, therefore in the position near middle wheel hub 11, air-flow is because inertia is gone out swirl vane; Cooperatively interact with the nozzle of Coanda effect; Reach the purpose of premixed fuel, and outer level swirl vane can rotate air-flow away from the position of middle wheel hub fully; Form stronger backflow in the position in downstream, can play the retention flame, prevent the effect of rough burning.
Fig. 3 has explained Fig. 1 and the selected slice location of Fig. 2.
Fig. 4 further illustrates the passage that cracking gas gets into the Coanda effect nozzle.Gas passage 2 can be tangent with the relative position that fuel infeeds passage 1 in the blade shown in the figure, also can be to pass through mutually, and the maximum stream flow when should work with the combustion chamber in the aperture of offering is as the criterion and designs.
Fig. 5 has shown that Fig. 4 partly cuts open the slice location of figure.
Cracking gas fuel flows to the approach that gas channel that profile 13 represented that cracking gas fuel passes through to be designed gets into the combustion zone among Fig. 6, and the flaring passage substantially profile 14 illustrated by the blade tip of interior level swirl vane and the annular air-flow path of the formed flaring of outer contour of the blade root of outer level swirl vane.A part of air-flow that the Coanda effect nozzle is sprayed can promptly flow along the bluff body surface deflections along with the deflection of intended wall facial contour, and forms the fuel boundary layer along madial wall; And because the effect of boundary-layer; This mixing is compared directly cracking gas is infeeded the mode in the high velocity air, can prevent effectively that fuel from spraying the flow field fluctuation that brings in the mixing, makes steadily premix of cracking gas fuel and air; With the uniform fuel gas mixture of shape, and do not cause tangible boundary layer separation to flow.Fuel gas is not to inject in the primary air, but is imported in the main flow by the tributary gradually, and the fluctuation that causes must be little a lot.In brief, be exactly the tangible fluctuation that the pre-mixing apparatus on coanda surface then can effectively reduce the stream pressure that lateral flow brings.
Also illustrated among Fig. 6 by outer level swirl vane group blade root portion and the formed annular flaring of interior level swirl vane group leaf tip line zone.The design of circular passage mainly is for cracking gas fuel and air a good mixing mode to be provided.Because the trailing edge of blade is a flaring; Therefore the air-flow near middle wheel hub flows out from blade earlier, and the eddy flow of inside and outside two-stage swirl vane is in the opposite direction, has produced stronger shearing flow field; Carry out strong mixing with the cracking gas fuel that is clipped in wherein; Make the first step carry out strong blending once more, avoid local cracking gas too high levels or low excessively phenomenon, make burning tend towards stability through the fuel mixture that Coanda effect carries out premix.
Among the present invention; Cracking gas fuel at first gets within the most inboard wheel hub through the gas inside fuel channel; Punishment cloth the intake channel of cracking gas fuel on the wall of inboard wheel hub; Cracking gas through interior level swirler blades, the gas chamber of wheel hub in carries out voltage stabilizing in the middle of getting into through these channel flow, again through utilizing the cracking gas fuel annular jet of Coanda effect design.Because Coanda effect, fuel can import through in the high-speed air of swirler blades attached on the wall then, and this is blending for the first time.
The two-stage cyclones vane group has been torn off a part near the place of middle wheel hub like quilt; The space that lacks blade has constituted the circular passage of a flaring in shape; Thereby the outer grade blade of cyclone is near the high velocity air at central hub place; There are not the constraint of blade and the inertia that itself has; Flow section and velocity attitude change; Certain phenomenon of dispersing can occur, in the flaring circular passage, locate diffusion; Same, the effect that spreads appears in the air-flow on interior level swirler blades top equally.Can produce at both intersections like this and shear the flow field; Blending will be not before be carried out with coanda nozzle wall surface cracking gas fuel that deflects and the mixed gas of fuel-air that has imported in the high velocity air in this flow field; Thereby reach good blending effect, this is blending for the second time.
Because portion is different with physical dimension with outside degreeof tortuosity in the blade; Each blade twist of outside eddy flow vane group is bigger; Size is also bigger, and air flow rate is bigger, and the eddy flow coefficient of gas is bigger; Comparatively speaking each blade of inner eddy flow vane group then twists less; Air flow rate is less, and the eddy flow coefficient is less relatively, can't form significantly recirculating zone; Only just shear the flow field to strengthen blending in order to cause the bottom airflow direction different, to form with the upper air direction; The outer level air-flow that cyclone produced, it leans on the part and the mutual shear-mixed of interior level eddy flow of middle wheel hub, cancels out each other, and eddy flow part in the outside is then keeping high speed airflow, can form stronger recirculating zone at the axis place, plays the effect of organizing combustion field.
Though the present invention is for the gas part of cracking gas fuel institute designed nozzle, can feed liquid fuel in this structure, can realize atomizing of liquid fuel and mixing equally.
Claims (5)
1. one kind is used for the cracking gas fuel injection device that chemical back heating circulates, and it is characterized in that: comprise inner wheel hub, middle wheel hub, outer wheel hub, interior level swirl vane, outer level swirl vane, centerbody calotte, interior level swirl vane is installed between inner wheel hub and the middle wheel hub; Outer level swirl vane is installed between middle wheel hub and the outer wheel hub; Center through hole is set in the inner wheel hub, forms fuel between inner wheel hub and the center through hole and infeed passage, the centerbody calotte infeeds the passage sealing with fuel; The intake channel of cracking gas fuel is set on the inner wheel hub; On the middle wheel hub cracking gas ring cavity is set, intake channel is communicated with the cracking gas ring cavity, and cracking gas ring cavity end is a nozzle; Interior level swirl vane and outer level swirl vane formation flaring passage, the gas that from nozzle, sprays gets into the combustion chamber through the flaring passage.
2. a kind of cracking gas fuel injection device that is used for the chemical back heating circulation according to claim 1 is characterized in that: the level swirl vane is different with the eddy flow direction of outer level swirl vane in described.
3. a kind of cracking gas fuel injection device that is used for the chemical back heating circulation according to claim 1 and 2 is characterized in that: described nozzle reaches nozzle for the Koln that outlet is the bluff body shape up and down.
4. a kind of cracking gas fuel injection device that is used for the chemical back heating circulation according to claim 1 and 2; It is characterized in that: the radial height of described outer grade swirl vane is greater than interior level swirl vane, grade swirl vane in the axial length of outer grade swirl vane is longer than.
5. a kind of cracking gas fuel injection device that is used for the chemical back heating circulation according to claim 3 is characterized in that: the radial height of level swirl vane is greater than interior level swirl vane outside described, and the axial length of outer level swirl vane is longer than interior level swirl vane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210213239.8A CN102721082B (en) | 2012-06-26 | 2012-06-26 | Cracking-gas fuel injection device for chemical regenerative cycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210213239.8A CN102721082B (en) | 2012-06-26 | 2012-06-26 | Cracking-gas fuel injection device for chemical regenerative cycle |
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| Publication Number | Publication Date |
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| CN102721082A true CN102721082A (en) | 2012-10-10 |
| CN102721082B CN102721082B (en) | 2014-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210213239.8A Expired - Fee Related CN102721082B (en) | 2012-06-26 | 2012-06-26 | Cracking-gas fuel injection device for chemical regenerative cycle |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980208A (en) * | 2012-11-19 | 2013-03-20 | 哈尔滨工程大学 | Dual-fuel spray nozzle for oil-gas automatic switching in chemical heat return circulation |
| CN103512047A (en) * | 2013-10-09 | 2014-01-15 | 哈尔滨工程大学 | Radial rotational flow double fuel nozzle for chemical regenerative cycle |
| CN104019448A (en) * | 2014-06-13 | 2014-09-03 | 北京北机机电工业有限责任公司 | Double-layer cyclone device of heater combustor |
| CN104180387A (en) * | 2013-05-23 | 2014-12-03 | 江苏汇能锅炉有限公司（丹阳锅炉辅机厂有限公司） | Novel cyclone spray nozzle for boiler |
| CN105020743A (en) * | 2015-07-15 | 2015-11-04 | 哈尔滨工程大学 | Fuel autoxidation splitting and axial staged combustion chamber |
| CN114923200A (en) * | 2022-06-22 | 2022-08-19 | 西北工业大学 | Multi-parameter combined two-stage axial swirler |
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| US20040177619A1 (en) * | 2002-09-12 | 2004-09-16 | The Boeing Company | Fluid injector and injection method |
| CN1912368A (en) * | 2006-08-23 | 2007-02-14 | 北京航空航天大学 | Fuel pre-evaporation and premix perforated pipe |
| CN200968235Y (en) * | 2006-11-18 | 2007-10-31 | 孔德昌 | Stamping type gas-turbine unit |
| CN202813441U (en) * | 2012-06-26 | 2013-03-20 | 哈尔滨工程大学 | Cracking gas fuel injection device for chemical regenerative cycle |
-
2012
- 2012-06-26 CN CN201210213239.8A patent/CN102721082B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040177619A1 (en) * | 2002-09-12 | 2004-09-16 | The Boeing Company | Fluid injector and injection method |
| CN1912368A (en) * | 2006-08-23 | 2007-02-14 | 北京航空航天大学 | Fuel pre-evaporation and premix perforated pipe |
| CN200968235Y (en) * | 2006-11-18 | 2007-10-31 | 孔德昌 | Stamping type gas-turbine unit |
| CN202813441U (en) * | 2012-06-26 | 2013-03-20 | 哈尔滨工程大学 | Cracking gas fuel injection device for chemical regenerative cycle |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980208A (en) * | 2012-11-19 | 2013-03-20 | 哈尔滨工程大学 | Dual-fuel spray nozzle for oil-gas automatic switching in chemical heat return circulation |
| CN104180387A (en) * | 2013-05-23 | 2014-12-03 | 江苏汇能锅炉有限公司（丹阳锅炉辅机厂有限公司） | Novel cyclone spray nozzle for boiler |
| CN103512047A (en) * | 2013-10-09 | 2014-01-15 | 哈尔滨工程大学 | Radial rotational flow double fuel nozzle for chemical regenerative cycle |
| CN104019448A (en) * | 2014-06-13 | 2014-09-03 | 北京北机机电工业有限责任公司 | Double-layer cyclone device of heater combustor |
| CN105020743A (en) * | 2015-07-15 | 2015-11-04 | 哈尔滨工程大学 | Fuel autoxidation splitting and axial staged combustion chamber |
| CN114923200A (en) * | 2022-06-22 | 2022-08-19 | 西北工业大学 | Multi-parameter combined two-stage axial swirler |
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| Publication number | Publication date |
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| CN102721082B (en) | 2014-08-20 |
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Effective date of registration: 20201231 Address after: 572024 area A129, 4th floor, building 4, Baitai Industrial Park, yazhouwan science and Technology City, Yazhou District, Sanya City, Hainan Province Patentee after: Nanhai innovation and development base of Sanya Harbin Engineering University Address before: 150001 Intellectual Property Office, Harbin Engineering University science and technology office, 145 Nantong Avenue, Nangang District, Harbin, Heilongjiang Patentee before: HARBIN ENGINEERING University |
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Granted publication date: 20140820 Termination date: 20210626 |