CN109737386A - Double-cyclone low emission combustor - Google Patents
Double-cyclone low emission combustor Download PDFInfo
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- CN109737386A CN109737386A CN201811510109.4A CN201811510109A CN109737386A CN 109737386 A CN109737386 A CN 109737386A CN 201811510109 A CN201811510109 A CN 201811510109A CN 109737386 A CN109737386 A CN 109737386A
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- cyclone
- combustion
- distance piece
- step distance
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Abstract
The invention discloses a kind of double-cyclone low emission combustor, including head of combustion chamber, which includes main combustion stage cyclone, pre-combustion grade cyclone and step distance piece；Main combustion stage cyclone, pre-combustion grade cyclone and step distance piece are coaxially disposed；Main combustion stage cyclone ring is located at step distance piece outer ring, and pre-combustion grade cyclone ring is located at the inner ring of step distance piece；Step distance piece is arranged along the axial direction of main combustion stage cyclone, and step distance piece is equipped with shrinkage expansion structure close to the inner ring of gas vent, and shrinkage expansion structure first reduces along the flow direction radius of gas and increases afterwards.The present invention separates it, forms the swirl flame of weak coupling, help to reduce disposal of pollutants by adding step distance piece between main combustion stage and pre-combustion grade cyclone.The present invention is also provided with shrinkage expansion structure close to the inner ring of gas vent in step distance piece, which improves the steady fiery range of pre-combustion grade, improves the stable operation range of entire combustion chamber.
Description
Technical field
The present invention relates to the energy and dynamic field, in particular to a kind of double-cyclone low emission combustor.
Background technique
The burning of fossil fuel is still the main power of the mankind and energy source.It is answered in the energy and many of dynamic field
In, increasingly higher demands are proposed to the disposal of pollutants of dynamic power machine, nitrogen oxides (NOx) especially, carbon monoxide
(CO), unburned hydrocarbon (UHC) and emissions such as (Smoke) of smoldering.
The reduction of these emissions relies primarily on combustion chamber realization, this just proposes higher design requirement to combustion chamber.
Wherein, the control of nitrogen oxides is the emphasis that low emission combustor considers again.According to existing research, NOx is mainly by by heating power type
Mechanism, the nitrogen under high temperature in air are generated by oxidation, therefore controlling indoor high-temperature region of burning is to reduce NOx generation amount
Key.Therefore the combustion zone temperature that on the one hand meet under big operating condition as far as possible is evenly distributed, and on the other hand also needs to guarantee to fire
Burning room has enough adjustable ranges.
Therefore modern advanced low emission combustor generally uses center hierarchical structure, i.e. pre-combustion grade and main combustion stage is total with one heart
Axis, and most of air enters from main combustion stage, pre-combustion grade primarily serves the effect of stable flame.At this point, low emission combustor
Core technology difficult point is just decomposed for two parts, first is that the matching and coupling of main pre-combustion grade double-cyclone, subtly organize two strands
Eddy flow, to guarantee the control of high-temperature region under point extinguishment characteristics and big operating condition；Second is that the blending of fuel and air, it be as short as possible
Being sufficiently mixed for fuel and air is realized in the ground time, and relatively reasonable equivalent proportion distribution is formed in outlet.The application is solution
Certainly above-mentioned first part proposes the eddy flow organization scheme with stronger universality optimized.
Summary of the invention
(1) technical problems to be solved
The present invention provides a kind of double-cyclone low emission combustor, by controlling the matching and coupling of main pre-combustion grade double-cyclone,
Solve the problems, such as the organization optimization of two strands of eddy flows.
(2) technical solution
To solve the above problems, the present invention provides a kind of double-cyclone low emission combustor, including head of combustion chamber, the combustion
Burning chamber-head portion includes: main combustion stage cyclone, pre-combustion grade cyclone and step distance piece；The main combustion stage cyclone, the pre-burning
Grade cyclone and the step distance piece are coaxially disposed；The main combustion stage cyclone ring is located at step distance piece outer ring,
The pre-combustion grade cyclone ring is located at the inner ring of the step distance piece；The step distance piece is along the main combustion stage cyclone
Axial setting, and the step distance piece is equipped with shrinkage expansion structure, the shrinkage expansion structure close to the inner ring of gas vent
First reduce along the flow direction radius of gas and increases afterwards.
Further, the head of combustion chamber further include: pre-combustion grade centerbody；The pre-combustion grade centerbody is set in described
The inner ring of pre-combustion grade cyclone is coaxially disposed with the pre-combustion grade cyclone；The pre-combustion grade centerbody is revolved along the pre-combustion grade
The axial direction setting for flowing device, cooperates with the shrinkage expansion structure and constitutes gas flow channel.
Further, the pre-combustion grade centerbody is equipped with the corresponding shrinkage expansion knot close to one end of the gas vent
The end of structure shrinkage direction.
Further, the wall thickness of the step distance piece is 0.5~2 times of the pre-combustion grade centerbody diameter.
Further, throat is equipped in the shrinkage expansion structure, the shrinkage expansion structure is separated by the throat
Constriction zone and extended region；The constriction zone and the equal ring of the extended region are located at the inner ring of the step distance piece, institute
The flow direction radius that constriction zone is stated along gas is gradually reduced, and the extended region gradually increases along the flow direction radius of gas
Greatly.
Further, the angle of the constriction zone respective side is 30~150 °, the angle of the extended region respective side
It is 20~160 °.
Further, further includes: premix air inlet pipe, the premix air inlet pipe and the main combustion stage cyclone are coaxially disposed,
The main combustion stage cyclone is set in the inner ring of the premix air inlet pipe.
Further, further includes: burner inner liner；The caliber of the burner inner liner is greater than the caliber of the premix air inlet pipe, described
The inlet end of burner inner liner is connected to by head end wall with the outlet side of the premix air inlet pipe.
Further, the pre-combustion grade cyclone is identical with the rotation direction of the main combustion stage cyclone.
(3) beneficial effect
The present invention provides a kind of double-cyclone low emission combustor, by between main combustion stage cyclone and pre-combustion grade cyclone
Step distance piece is added, main combustion stage cyclone and pre-combustion grade cyclone are separated, so that the double-cyclone flame of weak coupling is formed,
Help to reduce discharge, reduces combustion oscillation.The present invention is also arranged close to the inner ring of gas vent in step distance piece and receives simultaneously
Contracting expansion structure improves the steady fiery range of pre-combustion grade, improves the stable operation range of entire combustion chamber.In addition, the present invention mentions
The double-cyclone low emission combustor of confession has preferable applicability, is able to use fuel gas or liquid fuel, is suitable for a variety of
Combustion mode and a variety of combustion modes.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the double-cyclone low emission combustor provided in the preferred embodiment of the present invention；
Fig. 2 is the three-dimensional structure cross-sectional view of the double-cyclone low emission combustor provided in the preferred embodiment of the present invention；
Fig. 3 is that the double-cyclone low emission combustor provided in the preferred embodiment of the present invention uses the signal of premixed combustion mode
Figure；
Wherein, 1: pre-combustion grade centerbody；2: pre-combustion grade cyclone 3: main combustion stage cyclone；4: step distance piece；5: shrinking
Expansion structure；6: head end wall；7: burner inner liner；8: main combustion stage flame；9: pre-combustion grade flame；10: angle of throat；11: the angle of flare；
13: fuel premixes gas；14: premix air inlet pipe.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
Member's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a kind of double-cyclone low emission combustor, and as shown in Figure 1, Figure 2 and Figure 3, the double-cyclone is low
Discharging combustion chamber includes head of combustion chamber.Head of combustion chamber includes main combustion stage cyclone 3, pre-combustion grade cyclone 2 and step isolation
Section 4.Wherein, main combustion stage cyclone 3, pre-combustion grade cyclone 2 and step distance piece 4 are coaxially disposed.Step distance piece 4 is cylinder
Body structure, 3 ring of main combustion stage cyclone are located at 4 outer ring of step distance piece, and 2 ring of pre-combustion grade cyclone is located at the interior of step distance piece 4
Circle.Along the axial direction setting of main combustion stage cyclone 3, step distance piece 4 is equipped with close to the inner ring of gas vent to be shunk step distance piece 4
Expansion structure 5, shrinkage expansion structure 5 first reduce along the flow direction radius of gas and increase afterwards.
Wherein, pre-combustion grade cyclone 2 is identical with the rotation direction of main combustion stage cyclone 3.Axial leaf can be selected in pre-combustion grade cyclone 2
Chip cyclone, swirling number can be chosen for 0.5~1.2, and main combustion stage cyclone 3 also can be selected as bladed axial swirler,
Swirling number can be chosen for 0.5~1.2.
In the present embodiment, main combustion stage cyclone 3 and pre-combustion grade cyclone 2 include multiple swirl vanes, adjacent eddy flow leaf
Piece and peripheral side wall constitute swirl channel, and fuel mixture 13 generates swirl flame by swirl channel in head of combustion chamber.
Wherein, the setting direction of swirl vane can be adjusted as the case may be.
In the course of work, fuel mixture 13 respectively enters pre-combustion grade cyclone 2 and master in head of combustion chamber nature share split
Grade cyclone 3 is fired, weak coupling eddy flow is formed, gas 13 is premixed by the fuel of pre-combustion grade cyclone 2 and passes through shrinkage expansion structure 5,
Flame is stablized close to one end of outlet in step distance piece 4, is formd comprising pre-combustion grade flame 9 and main combustion stage flame 8
Layering swirl flame.
The embodiment of the present invention provides a kind of double-cyclone low emission combustor, by main combustion stage cyclone 3 and pre-combustion grade rotation
Step distance piece 4 is added between stream device 2, separates main combustion stage cyclone 3 and pre-combustion grade cyclone 2, to form weak coupling
Double-cyclone flame, facilitate reduce discharge, reduce combustion oscillation.The present invention also goes out in step distance piece 4 close to gas simultaneously
The inner ring setting shrinkage expansion structure 5 of mouth improves the steady fiery range of pre-combustion grade, improves the steady operation model of entire combustion chamber
It encloses.In addition, double-cyclone low emission combustor provided by the invention has preferable applicability, it is able to use fuel gas or liquid
Fuel is suitable for a variety of combustion modes and a variety of combustion modes.
Based on the above embodiment, in a preferred embodiment, as shown in Figure 1, Figure 2 and Figure 3, the head of combustion chamber is also
It include: pre-combustion grade centerbody 1.Pre-combustion grade centerbody 1 is set in the inner ring of pre-combustion grade cyclone 2, and pre-combustion grade centerbody 1 and pre-
Grade cyclone 2 is fired to be coaxially disposed.Pre-combustion grade centerbody 1 is arranged along the axial direction of pre-combustion grade cyclone 2, with shrinkage expansion structure
5 cooperations constitute gas flow channel.
When fuel mixture 13 is by the gas flow channel, relatively reasonable swirl jet is formed, and in the gas stream
Recirculating zone is constituted in dynamic channel, facilitates the stabilization of pre-combustion grade flame 9, and then widened the stability boundaris of entire flame.
For the boundary of further stable flame, in the present embodiment, 1 body of pre-combustion grade center is equipped with close to one end of gas vent
The end of corresponding 5 shrinkage direction of shrinkage expansion structure, which is gradually reduced to cooperate shrinkage expansion knot along gas flow direction
Structure 5.
Wherein, as shown in Fig. 2, when the double-cyclone low emission combustor is installed, it is only necessary to be by welding manner fixed installation
Can, pre-combustion grade centerbody 1 is integrally cast with pre-combustion grade cyclone 2, main combustion stage cyclone 3 and the whole casting of step distance piece 4
It makes.
Wherein, the wall thickness of step distance piece 4 should not be too large, and under normal circumstances, the wall thickness of step distance piece 4 is in pre-combustion grade
0.5~2 times of 1 diameter of heart body.The smaller coupling that can reinforce between main combustion stage flame 8 and pre-combustion grade flame 9 (is discharged not to reducing
Benefit), and the larger stabilization for being unfavorable for main combustion stage flame 8.
It is different from above-described embodiment, the present embodiment is equipped with the pre-combustion grade centerbody 1 of cooperation shrinkage expansion structure 5, by this
Pre-combustion grade centerbody 1 forms relatively reasonable swirl jet and reflux plot structure in head of combustion chamber, facilitates pre-combustion grade flame
Stabilization, and then widened the stability boundaris of entire flame.
Based on the above embodiment, in a preferred embodiment, as shown in Figure 1, Figure 2 and Figure 3, shrinkage expansion structure 5
Interior to be equipped with throat, shrinkage expansion structure 5 is separated into constriction zone and extended region by throat.Constriction zone and the equal ring of extended region
It is located at the inner ring of step distance piece 4, constriction zone is gradually reduced along the flow direction radius of gas, stream of the extended region along gas
Dynamic direction radius is gradually increased.
In the present embodiment, as shown in Figure 1, the angle of constriction zone respective side is 30~150 °, i.e., angle of throat 10 be 30~
150 °, the angle of the extended region respective side is 20~160 °, i.e., the angle of flare 11 is 20~160 °.
Wherein, double-cyclone low emission combustor further include: premix air inlet pipe 14, premix air inlet pipe 14 and main combustion stage eddy flow
Device 3 is coaxially disposed, and main combustion stage cyclone 4 is set in the inner ring of premix air inlet pipe 14.In addition, the double-cyclone low emission combustor is also
It include: burner inner liner 7.The caliber of burner inner liner 7 is greater than the caliber of premix air inlet pipe 14, and the inlet end of burner inner liner 7 passes through head end wall 6
It is connected to the outlet side of premix air inlet pipe 14.
In the course of work, fuel and air premix in advance, mix shape in premix air inlet pipe 14 by premix air inlet pipe 14
At fuel mixture 13.Then fuel mixture 13 respectively enters pre-combustion grade cyclone 2 and master in head of combustion chamber nature share split
Grade cyclone 3 is fired, weak coupling eddy flow is formed, gas 13 is premixed by the fuel of pre-combustion grade cyclone 2 and passes through shrinkage expansion structure 5,
Flame is stablized close to one end of outlet in step distance piece 4, is formd comprising pre-combustion grade flame 9 and main combustion stage flame 8
Layering swirl flame.
In other embodiments, also directly fuel can be passed through in main combustion stage cyclone 3 and pre-combustion grade cyclone 2, in master
It fires and forms fuel mixture 13 in grade cyclone 3 and pre-combustion grade cyclone 2, to generate comprising pre-combustion grade flame 9 and main combustion stage fire
The layering swirl flame of flame 8.
In conclusion the embodiment of the present invention provides a kind of double-cyclone low emission combustor, by 3 He of main combustion stage cyclone
Step distance piece 4 is added between pre-combustion grade cyclone 2, separates main combustion stage cyclone 3 and pre-combustion grade cyclone 2, thus shape
At the double-cyclone flame of weak coupling, helps to reduce discharge, reduce combustion oscillation.The present invention is also leaned in step distance piece 4 simultaneously
The inner ring setting shrinkage expansion structure 5 of nearly gas vent improves the steady fiery range of pre-combustion grade, improves the steady of entire combustion chamber
Determine working range.In addition, double-cyclone low emission combustor provided by the invention has preferable applicability, it is able to use gaseous state combustion
Material or liquid fuel are suitable for a variety of combustion modes and a variety of combustion modes.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (9)
1. a kind of double-cyclone low emission combustor, which is characterized in that including head of combustion chamber, the head of combustion chamber includes:
Main combustion stage cyclone, pre-combustion grade cyclone and step distance piece；
The main combustion stage cyclone, the pre-combustion grade cyclone and the step distance piece are coaxially disposed；The step isolation
Section is cylindrical structure, and the main combustion stage cyclone ring is located at step distance piece outer ring, and the pre-combustion grade cyclone ring is set
In the inner ring of the step distance piece；The step distance piece is arranged along the axial direction of the main combustion stage cyclone, and the step
Distance piece is equipped with shrinkage expansion structure, flow direction radius of the shrinkage expansion structure along gas close to the inner ring of gas vent
First reduce and increases afterwards.
2. double-cyclone low emission combustor according to claim 1, which is characterized in that the head of combustion chamber further include:
Pre-combustion grade centerbody；The pre-combustion grade centerbody is set in the inner ring of the pre-combustion grade cyclone, revolves with the pre-combustion grade
Flow device coaxial arrangement；The pre-combustion grade centerbody is arranged along the axial direction of the pre-combustion grade cyclone, with the shrinkage expansion
Structure cooperation constitutes gas flow channel.
3. double-cyclone low emission combustor according to claim 2, which is characterized in that the pre-combustion grade centerbody is close to institute
The one end for stating gas vent is equipped with the end in corresponding shrinkage expansion structure both shrinks direction.
4. double-cyclone low emission combustor according to claim 2, which is characterized in that the wall thickness of the step distance piece is
0.5~2 times of the pre-combustion grade centerbody diameter.
5. double-cyclone low emission combustor according to claim 1, which is characterized in that be equipped in the shrinkage expansion structure
The shrinkage expansion structure is separated into constriction zone and extended region by throat, the throat；The constriction zone and the expansion
The inner ring that the equal ring in region is located at the step distance piece is opened, the constriction zone is gradually reduced along the flow direction radius of gas,
The extended region is gradually increased along the flow direction radius of gas.
6. double-cyclone low emission combustor according to claim 5, which is characterized in that the folder of the constriction zone respective side
Angle is 30~150 °, and the angle of the extended region respective side is 20~160 °.
7. double-cyclone low emission combustor according to claim 1, which is characterized in that further include:
Air inlet pipe is premixed, the premix air inlet pipe and the main combustion stage cyclone are coaxially disposed, and the main combustion stage cyclone is arranged
In the inner ring of the premix air inlet pipe.
8. double-cyclone low emission combustor according to claim 7, which is characterized in that further include:
Burner inner liner；The caliber of the burner inner liner is greater than the caliber of the premix air inlet pipe, and the inlet end of the burner inner liner passes through head
Portion's end wall is connected to the outlet side of the premix air inlet pipe.
9. double-cyclone low emission combustor described according to claim 1~any one of 8, which is characterized in that the pre-combustion grade
Cyclone is identical with the rotation direction of the main combustion stage cyclone.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811510109.4A CN109737386A (en) | 2018-12-11 | 2018-12-11 | Double-cyclone low emission combustor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811510109.4A CN109737386A (en) | 2018-12-11 | 2018-12-11 | Double-cyclone low emission combustor |
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| CN109737386A true CN109737386A (en) | 2019-05-10 |
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Cited By (2)
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| CN111023150A (en) * | 2019-12-11 | 2020-04-17 | 中国空气动力研究与发展中心 | Extension plate for combustion chamber |
| WO2022193067A1 (en) * | 2021-03-15 | 2022-09-22 | 北京航空航天大学 | Combustion chamber for suppressing combustion oscillation, and combustor |
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| CN111023150A (en) * | 2019-12-11 | 2020-04-17 | 中国空气动力研究与发展中心 | Extension plate for combustion chamber |
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| WO2022193067A1 (en) * | 2021-03-15 | 2022-09-22 | 北京航空航天大学 | Combustion chamber for suppressing combustion oscillation, and combustor |
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