CN107543201B - One kind is oil-poor directly to spray and mixes low pollution combustor - Google Patents
One kind is oil-poor directly to spray and mixes low pollution combustor Download PDFInfo
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- CN107543201B CN107543201B CN201710608804.3A CN201710608804A CN107543201B CN 107543201 B CN107543201 B CN 107543201B CN 201710608804 A CN201710608804 A CN 201710608804A CN 107543201 B CN107543201 B CN 107543201B
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Abstract
The present invention relates to a kind of oil-poor directly injection and low pollution combustor is mixed, is made of casing, head of combustion chamber, flame drum outer wall and burner inner liner inner wall in diffuser, outer combustion case, combustion chamber；Combustion air all enters burner inner liner by head of combustion chamber, and using Grading And Zoning combustion strategies, head of combustion chamber is divided into grade and main combustion stage on duty；Grade and main combustion stage on duty are all made of directly injection and are mixed and burned mode, effectively avoid spontaneous combustion and the generation of tempering phenomenon, and reduce the risk of hugging appearance；The only level work on duty under idling rating, it is partially rich to design local equivalent proportion, guarantee combustion chamber operational stability, with the increase of combustion chamber operational state, main combustion stage is gradually opened, under big state, main combustion stage and grade on duty work at the same time, designed combustion area average equivalent ratio is partially poor, and combustion zone mean temperature is effectively reduced, to reduce fluff pulp.
Description
Technical field
The invention belongs to low pollution combustor fields, are related to the oil-poor direct injection of one kind and mixing low pollution combustor.
Background technique
In recent years, international community is higher and higher to the attention degree of environmental protection problem, the pollutant row of aero-engine
Although put account for environment gross contamination discharge specific gravity it is little, high-altitude pollutant is mainly derived from aero-engine.Therefore, international
The ICAO subordinate Environmental Protection Committee, civil aviation organization CAEP has formulated series of standards to civil aircraft engine CO, UHC and NOx
Discharge be made that strict regulations, the engine for only meeting emission request could obtain Certification.Therefore, it is necessary to send out energetically
Combustion with reduced pollutants technology is opened up to reduce aero-engine pollutant emission level, is wanted now with the following higher discharge to meet
It asks.
Currently, aero-engine combustion with reduced pollutants technology specifically includes that fuel-rich combustion-quickly extinguishing-poor oil firing's technology
Rich burn-Quick quench-Lean burn, RQL, lean premixed preevaporated combustion technology Lean Premixed
Prevaporised, LPP and oil-poor lean direct injection technology Lean Direct Injection, LDI, wherein oil-poor direct
Spray combustion technology is also known as oil-poor direct mixed combusting technology Lean Direct Mixing, LDM.The low dirt of PW company design
It contaminating combustion chamber TALON II and uses RQL technology, level of NOx emission has just been able to satisfy the requirement of CAEP6, but due in RQL technology,
Extinguishing process is possible to generate the reaction condition close to stoichiometric ratio, to generate a large amount of NOx, therefore RQL technology reduces dirt
The limited potential for contaminating discharge, is difficult to meet the more stringent discharge standard of the following ICAO.The patent of GE company application
US6354072, US6418726, US6363726, US8607575 and US8171735 are by LPP technical application to low pollution combustor
In, 50% and 60% are reduced using the regulation of the II combustion chamber NOx emission ratio CAEP6 of TAPS I and TAPS of LPP Technology design again,
And it is used for the regulation also low 30% of the NOx emission ratio CAEP8 of the TAPS III of GE9X.LDI technology is that fuel oil is directly injected to combustion
It burns in room and mixes with air generation diffusion combustion, due to not having fuel oil and air pre-mixing, there is no spontaneous combustions to ask with what is be tempered
Topic, and its combustion instability problem is also serious like that without LPP.Thus many research institutions have carried out about LDI in recent years
The research of technology, under the NASA ERA project support, Goodrich company devises the combustion chamber array LDI, the NOx of the program
Discharge lower than the regulation of CAEP6 75%.Parker company proposes multistage subregion LDI burning under the NASA UEET project support
Scheme, pollutant emission level, which can satisfy, reduces the requirement that CAEP6 provides NOx emission 70%, the application of Dalavan company
US9644844 patent proposes a kind of novel oil-poor direct ejection schemes of multiple spot, can effectively reduce disposal of pollutants level.
It is domestic that also there are many patent applications about low pollution combustor in recent years.Patent 201010591264.0,
201110214905.5,201310065034.4,201310722586.8 four kinds of low pollution combustors are disclosed, is that will burn
Room is divided into main combustion stage and pre-combustion grade, and wherein pre-combustion grade uses swirl stabilized diffusion combustion mode, and main combustion stage uses premixed combustion
Mode reduces pollutant emission while guaranteeing combustion chamber steady operation condition.Patent 201510011730.6 discloses one
The center classification low pollution combustor of kind pre-combustion grade RQL, main combustion stage LPP, pre-combustion grade uses rich oil diffusion combustion mode, so that combustion
The operation is stable under the small operating condition in room is burnt, and in spin chamber's tip designs quenching hole, reduces the disposal of pollutants of pre-combustion grade.It is domestic at present
Low pollution combustor fractional combustion strategy is widely used, wherein main combustion stage generallys use premix and pre-evaporation combustion system, existing
Under some engine behaviors, this is strictly the highly effective method for reducing pollutant, but with alternate-engine work
Make being substantially improved for state, combustor inlet temperature and inlet pressure dramatically increase, back and forth using premix and pre-evaporation mode meeting band
Fire and spontaneous combustion risk, and it is possible to cause serious combustion instability problem, therefore start for following civil aviation
The working condition of machine, there is an urgent need to one kind not only can guarantee combustion chamber steady operation, but also be able to satisfy the low of emission requirement
Contamination combustion chamber.
Summary of the invention
Technical problems to be solved
In order to avoid the shortcomings of the prior art, the present invention proposes the oil-poor direct injection of one kind and mixing combustion with reduced pollutants
Room, combustion chamber is divided into grade and main combustion stage on duty, and under small state, only level work on duty, grade on duty are non-pre- using local rich oil
Mixed lift-off flame combustion mode, guarantees combustion chamber steady operation under small state；Under big state, grade and main combustion stage on duty are simultaneously
Work, main combustion stage is directly sprayed using multiple spot and mixed combusting technology, and the average equivalent ratio of grade and main combustion stage on duty is partially poor, reduces
Fluff pulp of the combustion chamber under big state.
Technical solution
One kind is oil-poor directly to spray and mixes low pollution combustor, including diffuser, burner inner liner and combustion box；It is special
Sign is: multiple staged combustion devices are circumferentially arranged at head of combustion chamber 7, and the staged combustion device includes grade 8 on duty
With main combustion stage 9, be with grade 8 on duty it is interior, main combustion stage 9 be it is outer arrange and pass through using concentric-ring pattern welds connected, structure are as follows: on duty
Grade nozzle 16 is coaxially placed in grade cyclone inner wall 13 on duty by grade nozzle mounting base 17 on duty, grade nozzle mounting base 17 on duty and
The end face of grade cyclone on duty is concordant, and grade nozzle 16 on duty is concordant with the other end outlet damper 14 of grade cyclone on duty；It is main
Combustion grade oil collecting ring outer wall 24 is coaxially fixed on grade cyclone outer wall 12 on duty, forms main combustion stage oil-collecting ring cavity 31 between the two, main
Combustion grade oil collecting ring end face is evenly distributed with multiple main combustion stage fuel inlets 23；Main combustion stage oil collecting ring outer wall 24 is empty by main combustion stage fuel-oil atmozation
Gas channel support rib 25 connects main combustion stage fuel-oil atmozation air duct outer wall 26, main combustion stage oil collecting ring outer wall 24, main combustion stage fuel oil
Atomizing air channel outer wall 26 and main combustion stage fuel-oil atmozation air duct ribs 25 constitute main combustion stage fuel-oil atmozation air intlet
32, main combustion stage oil collecting ring outer wall 24 and main combustion stage fuel-oil atmozation air duct outer wall 26 form main combustion stage cooling air between the two
With fuel-oil atmozation air duct 30；Multiple main combustion stage fuel nozzles 27, which are evenly distributed, is fixed on grade cyclone outlet baffle on duty
14 outsides, with main combustion stage fuel-oil atmozation air duct outer wall 26, main combustion stage oil collecting ring outer wall 24 and grade cyclone outer wall on duty
12 are connected, and are 10 °~30 ° with 16 axial angle of grade nozzle on duty；Main combustion stage fuel nozzle import 33 and main combustion stage oil collecting ring
Chamber 31 is connected to, and the main combustion stage fuel-oil atmozation air duct 36 and main combustion stage cooling air and fuel-oil atmozation air duct 30 of nozzle connect
It is logical, it is equipped with main combustion stage nozzle between grade cyclone outlet baffle 14 and main combustion stage fuel nozzle 27 on duty, baffle 29 is installed；Main combustion
Grade cyclone outlet baffle 37 is fixed on main combustion stage fuel-oil atmozation air duct outer wall 26, passes through the non-rotational flow air channel of main combustion stage
Ribs 38 connect main combustion stage cyclone inner wall 39, the outside of main combustion stage cyclone inner wall 39 coaxially be connected main combustion stage cyclone leaf
Piece 40, main combustion stage swirler blades (40) and main combustion stage cyclone outer wall (41) form main combustion stage rotational flow air by being welded to connect
Channel (43)；Cooling is evenly equipped on the expansion segment of the main combustion stage nozzle installation baffle 29 and main combustion stage cyclone outlet baffle 37
Aperture 28.
34 depth of axial step through-hole and main combustion stage fuel nozzle in the main combustion stage fuel nozzle 27 export 35 diameters
Than being 5~20.
The main combustion stage fuel nozzle inner passage length is 5-20 times that main combustion stage fuel nozzle exports 35 diameters
11 angle of described value class swirler blades is 30 °~50 °, and the number of blade is 6~20.
40 angle of main combustion stage swirler blades is 45 °~75 °, and the number of blade is 6~20.
The contraction side of described value class cyclone outlet baffle 14 and 8 axial angle of grade on duty are 30 °~60 °.
The expansion segment and 9 axis angle of main combustion stage of the main combustion stage cyclone outlet baffle 37 are 30 °~70 °.
Beneficial effect
One kind proposed by the present invention it is oil-poor directly spray and mix low pollution combustor, by diffuser, outer combustion case,
Casing, head of combustion chamber, flame drum outer wall and burner inner liner inner wall composition in combustion chamber；Combustion air all by head of combustion chamber into
Enter burner inner liner, using Grading And Zoning combustion strategies, head of combustion chamber is divided into grade and main combustion stage on duty；Grade and main combustion stage on duty are equal
Using directly spraying and being mixed and burned mode, spontaneous combustion and the generation of tempering phenomenon are effectively avoided, and reduces hugging appearance
Risk；The only level work on duty under idling rating, it is partially rich to design local equivalent proportion, guarantees combustion chamber operational stability, with
The increase of combustion chamber operational state, main combustion stage are gradually opened, and under big state, main combustion stage and grade on duty are worked at the same time, design combustion
It is partially poor to burn area's average equivalent ratio, combustion zone mean temperature is effectively reduced, to reduce fluff pulp.
Possessed advantage is as follows compared with prior art by the present invention:
1 uses fractional combustion concept, and head of combustion chamber is divided into grade and main combustion stage on duty, solves combustion with reduced pollutants chamber-head
Portion's air inflow increases and the design contradiction of small in stable condition work, on the basis of widening combustion chamber stable operation range, effectively
Reduce fluff pulp；
2 main combustion stages use oil-poor direct injection and mixed combusting technology, avoid spontaneous combustion and tempering problem, effectively reduce
The risk that hugging occurs；
The injection of 3 main combustion stage fuel oils is directly sprayed using the coaxial fair current with annular air, can be guaranteed in the full work in combustion chamber
Make have reasonable jet penetration in range, and multi-point injection mode of recovering the oil, guarantees that fuel oil can be quickly mixed with air
It closes and forms uniform flammable mixed gas.
Detailed description of the invention
Loopful combustion chamber three-dimensional axonometric drawing Fig. 1 of the invention
Loopful chamber structure cross-sectional view Fig. 2 of the invention
Head of combustion chamber structure sectional view Fig. 3 of the invention
Head of combustion chamber Fig. 4 of the invention level structure signal on duty and cross-sectional view
The structural representation of head of combustion chamber main combustion stage and cross-sectional view Fig. 5 of the invention
Head of combustion chamber main combustion stage fuel nozzle structural representation and cross-sectional view Fig. 6 of the invention
In figure: 1- diffuser, 2- outer combustion case, casing in the combustion chamber 3-, 4- flame drum outer wall, in 5- burner inner liner
Wall, 6- blending hole, 7- head of combustion chamber, 8- grade on duty, 9- main combustion stage, 10- grade fuel inlet on duty, 11- grade cyclone on duty
Blade, 12- grade cyclone outer wall on duty, 13- grade cyclone inner wall on duty, 14- grade cyclone outlet baffle on duty, 15- are on duty
Grade nozzle installs gasket, 16- grade nozzle on duty, 17- grade nozzle mounting base on duty, 18- grade rotational flow air import on duty, 19- value
Class's swirl channel, 20- grade rotational flow air annular straight channel on duty, 21- grade rotational flow air annular convergent passage on duty, 22-
Grade rotational flow air outlet on duty, 23- main combustion stage fuel inlet, 24- main combustion stage oil collecting ring outer wall, the fuel-oil atmozation of 25- main combustion stage are empty
Gas channel support rib, 26- main combustion stage fuel-oil atmozation air duct outer wall, 27- main combustion stage fuel nozzle, the cooling aperture of 28-, 29-
Main combustion stage nozzle installs baffle, 30- main combustion stage cooling air and fuel-oil atmozation air duct, 31- main combustion stage oil-collecting ring cavity, 32-
Main combustion stage fuel-oil atmozation air intlet, 33- main combustion stage fuel nozzle import, 34- main combustion stage fuel nozzle inner passage, 35- master
Fire the outlet of grade fuel nozzle, 36- main combustion stage fuel-oil atmozation air duct, 37- main combustion stage cyclone outlet baffle, 38- main combustion stage
Non- rotational flow air channel support rib, 39- main combustion stage cyclone inner wall, 40- main combustion stage swirler blades, 41- main combustion stage cyclone
Outer wall, 42- main combustion stage rotational flow air import, 43- main combustion stage rotational flow air channel, the non-rotational flow air channel of 44- main combustion stage, 45-
Main combustion stage air annular straight channel, 46- main combustion stage air annular convergent passage, 47- main combustion stage air outlet slit, 48- main combustion stage
Non- rotational flow air import.
Specific embodiment
Now in conjunction with embodiment, attached drawing, the invention will be further described:
The invention adopts the following technical scheme: it is a kind of based on oil-poor directly injection and mixed low pollution combustor, including
Diffuser, outer combustion case, casing, flame drum outer wall, burner inner liner inner wall, blending hole and head of combustion chamber in combustion chamber.It is high
Fast air-flow is divided into three strands after diffuser deceleration diffusion, one enters the outer ring that outer combustion case and flame drum outer wall surround
Chamber, one enters the interior ring cavity that casing and burner inner liner inner wall surround in combustion chamber, one enters outside burner inner liner from head of combustion chamber
The combustion zone that wall and burner inner liner inner wall surround, the air capacity for participating in burning all enter from head of combustion chamber.The chamber head
Portion uses grading combustion technology, is divided into grade and main combustion stage on duty, and grade and main combustion stage on duty are arranged using concentric-ring pattern and passed through weldering
It connects in succession.Described value class includes grade swirler blades on duty, grade cyclone outer wall on duty, grade cyclone inner wall on duty, on duty
Grade cyclone outlet baffle, grade nozzle on duty installation gasket, grade nozzle on duty and grade nozzle mounting base on duty, air is from grade on duty
Rotational flow air import enters the value surrounded by grade cyclone outer wall on duty, grade swirler blades on duty and grade cyclone inner wall on duty
In class's swirl channel, so that air-flow be made to generate rotary motion, stable recirculating zone is formed for stationary value in grade downstream on duty
Class's flame, grade nozzle on duty are mounted on grade center on duty, and grade jet expansion on duty and grade rotational flow air on duty outlet keep flat
Together, the burning of guarantee value class is complete non-premixed combustion mode.The main combustion stage includes main combustion stage oil collecting ring outer wall, main combustion stage combustion
Oily atomizing air channel ribs, main combustion stage fuel-oil atmozation air duct outer wall, main combustion stage fuel nozzle, cooling aperture, main combustion
Grade nozzle installation baffle, main combustion stage cyclone outlet baffle, the non-rotational flow air channel support rib of main combustion stage, in main combustion stage cyclone
Wall, main combustion stage swirler blades and main combustion stage cyclone outer wall, wherein main combustion stage cyclone inner wall, main combustion stage swirler blades and
Main combustion stage cyclone outer wall forms main combustion stage rotational flow air channel by being welded to connect, and main combustion stage cyclone inner wall, main combustion stage are non-
Rotational flow air channel support rib and main combustion stage cyclone outlet baffle, which pass through to be welded to connect, forms the non-rotational flow air channel of main combustion stage,
Main combustion stage air one enters main combustion stage rotational flow air channel from main combustion stage rotational flow air import, forms rotational flow, another portion
Air is divided to enter the non-rotational flow air channel of main combustion stage, subsequent rotational flow air and non-rotational flow air from the non-rotational flow air import of main combustion stage
Eddy flow tail is mixed and eliminated in main combustion stage air annular straight channel, then is accelerated by main combustion stage air annular convergent passage
It is flowed out from main combustion stage air outlet slit；Main combustion stage oil collecting ring outer wall, grade cyclone outer wall on duty and grade cyclone outlet baffle on duty
By being welded to connect and surrounding main combustion stage oil-collecting ring cavity, main combustion stage fuel nozzle is mounted on grade cyclone outlet on duty by welding
On baffle and main combustion stage nozzle installation baffle, main combustion stage fuel oil enters main combustion stage oil-collecting ring cavity from main combustion stage fuel inlet, then
Enter main combustion stage fuel nozzle inner passage from main combustion stage fuel nozzle import, finally exports and spray from main combustion stage fuel nozzle.
Main combustion stage fuel-oil atmozation air and cooling air enter main combustion stage fuel-oil atmozation air from main combustion stage fuel-oil atmozation air intlet and lead to
Road, portion of air enter main combustion stage fuel-oil atmozation air duct, which sprays together with fuel oil, promote fuel oil quick
Atomization, another part air enter cooling aperture, and the partial air is for cooling down main combustion stage nozzle installation baffle and main combustion stage rotation
Device outlet damper is flowed, prevents high-temperature fuel gas from burning out baffle.
The principle of the present invention is as follows: by rationally control the burning local equivalent proportion in Indoor Combustion area, average equivalent ratio with
And air-fuel mixture uniformity coefficient controls the Temperature Distribution of combustion zone, so that the production quantity of effectively contaminant restraining, reaches low dirt
Contaminate the purpose of burning.The high-speed flow come out from compressor is divided into three strands after diffuser deceleration diffusion, flows to outer ring respectively
Chamber, interior ring cavity and head of combustion chamber, combustion air whole flowing in combustion chamber head, head of combustion chamber are divided into grade on duty and main combustion
Grade, under small state, only level work on duty, grade on duty use non-premixed combustion mode, and grade part on duty equivalent proportion is partially rich at this time,
Guarantee combustion chamber under small state can steady operation, under big state, grade and main combustion stage on duty are worked at the same time, main combustion stage use
Oil-poor directly to spray and be mixed and burned mode, the injection of main combustion stage fuel oil uses the coaxial fair current directly side of injection with annular air
Formula, main combustion stage fuel oil quickly mix with rotational flow air and form uniform flammable mixed gas, at this time grade and main combustion stage on duty averagely when
It is partially poor to measure ratio, to effectively control combustion zone temperature, reduces fluff pulp.Therefore, this it is oil-poor it is direct injection and mix low
Contamination combustion chamber not only can guarantee that engine had wide steady operation boundary, but also fluff pulp can be effectively reduced.
The grade swirler blades angle on duty is 30 ° -50 °, number of blade 6-20.
The main combustion stage swirler blades angle is 45 ° -75 °, number of blade 6-20.
The main combustion stage fuel nozzle and axis angle is 10 ° -30 °.
The contraction side and axis angle of the grade cyclone outlet baffle on duty are 30 ° -60 °.
The convergence side of the main combustion stage cyclone outlet baffle and axis angle are 30 ° -70 °
The main combustion stage fuel nozzle inner passage length is 5-20 times of injection diameter.
The each technological parameter of appropriate adjustment, can make: grade part on duty equivalent proportion is 0.9-1.5；Grade on duty and main combustion
Grade average equivalent ratio is 0.4-0.9.
In specific implementation: as shown in Figs. 1-2, the specific embodiment of the invention provides a kind of based on oil-poor direct injection and mixed
The low pollution combustor of conjunction, including diffuser 1, outer combustion case 2, casing 3 in combustion chamber, flame drum outer wall 4, in burner inner liner
Wall 5, blending hole 6 and head of combustion chamber 7.The high-speed flow flowed out from high-pressure compressor is divided into after 1 deceleration diffusion of diffuser
Three strands, one flows to the outer ring cavity that outer combustion case 2 and flame drum outer wall 4 surround, one flows to casing 3 and fire in combustion chamber
The interior ring cavity that flame cylinder inner wall 5 surrounds, one enters the burning that flame drum outer wall 4 and burner inner liner inner wall 5 surround from head of combustion chamber 7
Area, the air a part for flowing into inside and outside ring cavity are used for burner inner liner wall cooling, and another part flows into combustion zone from blending hole 6 and is used to
Combustor exit temperature distribution is adjusted, is all used as combustion air by the air that head of combustion chamber 7 flows into.Head of combustion chamber 7
Air capacity account for the 60%-80% of combustion chamber total air, cooling air volume accounts for the 20%-30% of total air, dilution air
Amount accounts for the 0%-10% of total air.
As shown in figure 3, the present invention uses grading combustion technology, head of combustion chamber 7 divides for grade 8 on duty and main combustion stage 9, slow
Only grade 8 on duty works under car state, and the local equivalent proportion of grade 8 on duty is 0.9-1.5 at this time, guarantees fire of the combustion chamber under small state
Flame is stablized, and with the increase of combustion chamber operational state, main combustion stage 9 is gradually opened, and main combustion stage 9 and grade on duty 8 are same under big state
When work, at this time two-stage average equivalent ratio be 0.4-0.9, guarantee burning by it is oil-poor it is direct injection and mixed firinor fuel burning in a manner of carries out,
To reduce fluff pulp.
As shown in figure 4, grade 8 on duty mainly includes grade swirler blades 11 on duty, grade cyclone outer wall 12 on duty, grade on duty
Cyclone inner wall 13, grade cyclone outlet baffle 14 on duty, grade nozzle on duty installation gasket 15, grade nozzle 16 on duty and grade on duty
Nozzle mounting base 17, grade swirler blades 11, grade cyclone outer wall 12 on duty, grade cyclone inner wall 13 on duty and grade on duty on duty
By being welded to connect, grade nozzle 16 on duty and grade nozzle mounting base 17 on duty are connected through a screw thread cyclone outlet baffle 14, and
Grade nozzle installation gasket 15 on duty is installed additional to play sealing function.Grade air on duty flows through value from grade rotational flow air import 18 on duty
Class's swirl channel 19 simultaneously generates swirling motion, and swirl vane tail is eliminated in grade rotational flow air annular straight channel 20 on duty
Influence, then pass through grade rotational flow air annular convergent passage 21 on duty and accelerate flowing, export 22 shapes in grade rotational flow air on duty
The radially high VELOCITY DISTRIBUTION in the low outside in inside, then in downstream, streamline is expanded to form recirculating zone, and grade rotational flow air on duty goes out
Mouth 22 is minimum flow area position on air flow circuit, can be by changing the area come regulated value class air capacity.Grade combustion on duty
Oil flows into the inner passage of grade nozzle mounting base 17 on duty from grade fuel inlet 10 on duty, then passes through grade fuel nozzle 16 on duty
Mist of oil is downstream sprayed, is then quickly uniformly mixed to form flammable mixed gas with air.Grade swirler blades 11 on duty use axis stream
Formula prismatic blade, eddy flow angle are 30 ° -50 °, and blade quantity is 6-20, the contraction side of grade cyclone outlet baffle 14 on duty with
Axis angle is 30 ° -60 °, and the outlet of grade fuel nozzle 16 on duty is concordant with grade rotational flow air on duty 22 holdings of outlet, is guaranteed on duty
Grade is burnt in a manner of non-premixed combustion.
As seen in figs. 5-6, main combustion stage is by main combustion stage oil collecting ring outer wall 24, main combustion stage fuel-oil atmozation air duct ribs
25, main combustion stage fuel-oil atmozation air duct outer wall 26, main combustion stage fuel nozzle 27, cooling aperture 28, main combustion stage nozzle installation gear
Plate 29, main combustion stage cyclone outlet baffle 37, the non-rotational flow air channel support rib 38 of main combustion stage, main combustion stage cyclone inner wall 39,
Main combustion stage swirler blades 40 and main combustion stage cyclone outer wall 41 are constituted.Main combustion stage cyclone inner wall 39, main combustion stage cyclone leaf
Piece 40 and main combustion stage cyclone outer wall 41 are by being welded to connect, main combustion stage cyclone inner wall 39 and main combustion stage cyclone outlet baffle
It is connected between 37 by the non-rotational flow air channel support rib 38 of main combustion stage, 9 portion of air of main combustion stage is from main combustion stage rotational flow air
Import 42 enters main combustion stage rotational flow air channel 43, and another part air enters main combustion stage from the non-rotational flow air import 48 of main combustion stage
Non- rotational flow air channel 44, subsequent main combustion stage rotational flow air and non-rotational flow air mix in main combustion stage air annular straight channel 45
It closes to weaken swirl strength and eliminate swirl vane tail, then accelerates flowing in main combustion stage air annular convergent passage 46,
Finally flowed out from main combustion stage air outlet slit 47.Main combustion stage oil collecting ring outer wall 24, grade cyclone outer wall 12 on duty and grade eddy flow on duty
Device outlet damper 14 is mounted on by being welded to connect and surrounding main combustion stage oil-collecting ring cavity 31, main combustion stage fuel nozzle 27 by welding
On grade cyclone outlet baffle 14 and main combustion stage nozzle on duty installation baffle 29, main combustion stage fuel oil from main combustion stage fuel inlet 23 into
Enter main combustion stage oil-collecting ring cavity 31, then enters main combustion stage fuel nozzle inner passage 34 from main combustion stage fuel nozzle import 33, most
It is sprayed afterwards from main combustion stage fuel nozzle outlet 35.Main combustion stage fuel-oil atmozation air and cooling air are from main combustion stage fuel-oil atmozation air
Import 32 enters main combustion stage cooling air and fuel-oil atmozation air duct 30, and portion of air enters main combustion stage fuel-oil atmozation air
Channel 36, the partial air spray together with fuel oil, promote fuel oil quick break, and another part air enters cooling aperture 28,
The partial air prevents high-temperature fuel gas from burning for cooling down main combustion stage nozzle installation baffle 29 and main combustion stage cyclone outlet baffle 37
Bad baffle.It is 5-20, main combustion that 34 length of main combustion stage fuel nozzle inner passage and main combustion stage fuel nozzle, which export 35 diameter ratios,
Grade the ratio between fuel-oil atmozation air capacity and amount of fuel are 0.5-5, and main combustion stage fuel nozzle 27 and axis angle are 10 ° -30 °.Main combustion
Grade swirler blades 40 use axial-flow type prismatic blade, and eddy flow angle is 45 ° -75 °, the convergence of main combustion stage cyclone outlet baffle 37
Side and axis angle are 30 ° -70 °.
Claims (7)
1. a kind of oil-poor directly injection and mixing low pollution combustor, including diffuser, burner inner liner and combustion box；Its feature
Be: multiple staged combustion devices are circumferentially arranged at head of combustion chamber (7), and the staged combustion device includes grade on duty
(8) and main combustion stage (9), be with grade on duty (8) it is interior, main combustion stage (9) be it is outer arrange using concentric-ring pattern and pass through welding connected, tie
Structure are as follows: grade nozzle (16) on duty is coaxially placed in grade cyclone inner wall (13) on duty by grade nozzle mounting base (17) on duty, on duty
Grade nozzle mounting base (17) is concordant with the end face of grade cyclone on duty, and grade nozzle (16) outlet on duty goes out with grade rotational flow air on duty
Mouth (22) keeps concordant；Main combustion stage oil collecting ring outer wall (24) is coaxially fixed on grade cyclone outer wall (12) on duty, between the two shape
At main combustion stage oil-collecting ring cavity (31), main combustion stage oil collecting ring end face is evenly distributed with multiple main combustion stage fuel inlets (23)；Main combustion stage oil collecting ring
Outer wall (24) connects main combustion stage fuel-oil atmozation air duct outer wall by main combustion stage fuel-oil atmozation air duct ribs (25)
(26), main combustion stage oil collecting ring outer wall (24), main combustion stage fuel-oil atmozation air duct outer wall (26) and main combustion stage fuel-oil atmozation air
Channel support rib (25) constitutes main combustion stage fuel-oil atmozation air intlet (32), main combustion stage oil collecting ring outer wall (24) and main combustion stage fuel oil
Atomizing air channel outer wall (26) forms main combustion stage cooling air and fuel-oil atmozation air duct (30) between the two；Multiple main combustions
Grade fuel nozzle (27), which is evenly distributed, to be fixed on the outside of grade cyclone outlet baffle (14) on duty, empty with main combustion stage fuel-oil atmozation
Gas channel outer wall (26), main combustion stage oil collecting ring outer wall (24) and grade cyclone outer wall on duty (12) are connected, and spray with grade on duty
Mouth (16) axial angle is 10 °~30 °；Main combustion stage fuel nozzle import (33) is connected to main combustion stage oil-collecting ring cavity (31), nozzle
Main combustion stage fuel-oil atmozation air duct (36) be connected to main combustion stage cooling air and fuel-oil atmozation air duct (30), grade on duty
Main combustion stage nozzle installation baffle (29) is equipped between cyclone outlet baffle (14) and main combustion stage fuel nozzle (27)；Main combustion stage rotation
Stream device outlet damper (37) is fixed on main combustion stage fuel-oil atmozation air duct outer wall (26), passes through the non-rotational flow air channel of main combustion stage
Ribs (38) connect main combustion stage cyclone inner wall (39), the coaxially connected main combustion stage rotation of the outside of main combustion stage cyclone inner wall (39)
It flows device blade (40), main combustion stage swirler blades (40) and main combustion stage cyclone outer wall (41) pass through welded connecting and form main combustion stage
Rotational flow air channel (43)；The expansion segment of the main combustion stage nozzle installation baffle (29) and main combustion stage cyclone outlet baffle (37)
On be evenly equipped with cooling aperture (28).
2. oil-poor according to claim 1 directly spray and mix low pollution combustor, it is characterised in that: the main combustion stage combustion
Axial step through-hole (34) depth and main combustion stage fuel nozzle outlet (35) diameter ratio in oil burner nozzle (27) are 5~20.
3. oil-poor according to claim 2 directly spray and mix low pollution combustor, it is characterised in that: the main combustion stage
Fuel nozzle inner passage length is 5-20 times of main combustion stage fuel nozzle outlet (35) diameter.
4. oil-poor according to claim 1 directly spray and mix low pollution combustor, it is characterised in that: the rotation of described value class
Flowing device blade (11) angle is 30 °~50 °, and the number of blade is 6~20.
5. oil-poor according to claim 1 directly spray and mix low pollution combustor, it is characterised in that: the main combustion stage rotation
Flowing device blade (40) angle is 45 °~75 °, and the number of blade is 6~20.
6. oil-poor according to claim 1 directly spray and mix low pollution combustor, it is characterised in that: the rotation of described value class
The contraction side and grade on duty (8) axial angle for flowing device outlet damper (14) are 30 °~60 °.
7. oil-poor according to claim 1 directly spray and mix low pollution combustor, it is characterised in that: the main combustion stage rotation
The expansion segment and main combustion stage (9) axis angle for flowing device outlet damper (37) are 30 °~70 °.
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