WO2022193067A1 - Chambre de combustion pour suppression d'oscillation de combustion, et brûleur - Google Patents

Chambre de combustion pour suppression d'oscillation de combustion, et brûleur Download PDF

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Publication number
WO2022193067A1
WO2022193067A1 PCT/CN2021/080781 CN2021080781W WO2022193067A1 WO 2022193067 A1 WO2022193067 A1 WO 2022193067A1 CN 2021080781 W CN2021080781 W CN 2021080781W WO 2022193067 A1 WO2022193067 A1 WO 2022193067A1
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WO
WIPO (PCT)
Prior art keywords
combustion
outlet end
stage
combustion stage
face
Prior art date
Application number
PCT/CN2021/080781
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English (en)
Chinese (zh)
Inventor
韩啸
韩猛
林宇震
周宇晨
Original Assignee
北京航空航天大学
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Application filed by 北京航空航天大学 filed Critical 北京航空航天大学
Priority to PCT/CN2021/080781 priority Critical patent/WO2022193067A1/fr
Publication of WO2022193067A1 publication Critical patent/WO2022193067A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
    • F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
    • F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
    • F23R3/38—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply comprising rotary fuel injection means

Definitions

  • the present application relates to the technical field of energy and power, and in particular, to a combustion chamber and a burner for suppressing combustion oscillation.
  • combustion oscillation is a common technical challenge in various types of burners, which are widely found in boilers, gas water heaters, gas turbines and other combustion devices.
  • advanced combustion devices often use lean premixed combustion mode, and combustion devices are often in a state near flameout Work is very sensitive to external disturbances, and is easily affected by external disturbances, resulting in heat release rate fluctuations.
  • active control is to use special monitors and active actuators to actively apply appropriate external excitation (for inlet air or fuel supply, etc.) according to the monitored signals such as pressure pulsation in the combustion system to suppress or eliminate the heat release rate. Coupling between pulsations and pressure oscillations (sound waves).
  • passive control refers to the addition of fixed devices to the combustion system to suppress or eliminate combustion oscillations.
  • acoustic components such as Helmholtz resonators
  • Helmholtz resonators can suppress combustion oscillations at specific frequencies.
  • the disadvantage is that the volume is large, and it can only be effective for a specific frequency, so a lot of experiments and debugging need to be done in advance.
  • the present application aims to solve at least one of the technical problems existing in the prior art. Therefore, the present application proposes a combustion chamber for suppressing combustion oscillation, so as to suppress the occurrence of the phenomenon of combustion oscillation.
  • the application also proposes a burner.
  • the pre-combustion stage including a central body and a pre-combustion stage swirler and an interstage disposed on the periphery of the central body;
  • the main combustion stage is arranged on the periphery of the pre-combustion stage, and the main combustion stage includes a main combustion stage swirler and a main combustion stage outer ring;
  • a combustion chamber main body comprising an end wall and a side wall, the end wall connecting the main combustion stage outer ring and the side wall;
  • an anti-vibration ring fixed on the inner surface of the end wall of the end wall and/or the outer ring outlet end face of the outer ring of the main combustion stage, and the anti-vibration ring is formed in a direction facing away from the main combustion stage
  • the flame channel is gradually expanding, the inlet end of the flame channel is butted with the outlet end of the main combustion stage, and the outlet end of the flame channel is communicated with the inner cavity of the combustion chamber main body.
  • combustion oscillation is generally suppressed by machining the end wall or the side wall of the combustion chamber to have a conical transition structure, while the combustion chamber described in the present application is at the end of the end wall.
  • the same effect can be achieved by installing the anti-vibration ring on the inner surface of the wall and/or the outlet end face of the outer ring of the outer ring of the main combustion stage; compared with the combustion chamber of the prior art, the combustion chamber of the present application has a retrofit cost Low, the advantages of a wide range of applications.
  • the pre-stage, the main combustion stage, the combustion chamber main body and the anti-vibration ring are all arranged coaxially.
  • the inner wall of the anti-vibration ring is formed with a flow spoiler.
  • the spoiler includes a plurality of steps distributed along the axis of the central body, or,
  • the spoiler portion includes a plurality of annular spoiler grooves distributed along the axis of the central body, or,
  • the spoiler portion includes a longitudinal spoiler groove penetrating the inner wall along the axis direction of the central body, and the number of the longitudinal spoilers is plural and distributed along the circumference of the inner wall.
  • the cross section of the inlet end and the cross section of the outlet end are both circular, or both the cross section of the inlet end and the cross section of the outlet end are oval.
  • the interstage section includes an outlet end face of the interstage section
  • the main combustion stage swirler includes an outlet end face of the main combustion stage swirler
  • the outlet end face of the interstage section is connected to the outer ring.
  • the outlet end face is misaligned.
  • the outlet end surface of the outer ring and the inner surface of the end wall are coplanar.
  • the distance between the outlet end face of the main combustion stage swirler and the outlet end face of the interstage section along the axial direction of the central body is a first distance; the main combustion stage swirler The distance between the outlet end face and the outlet end face of the outer ring along the axial direction of the central body is a second interval, and the first interval is greater than the second interval.
  • the distance between the outlet end face of the main combustion stage swirler and the outlet end face of the interstage section along the axial direction of the central body is a first distance; the main combustion stage swirler The distance between the outlet end face and the outlet end face of the outer ring along the axial direction of the central body is a second pitch, and the first pitch is smaller than the second pitch.
  • a burner according to an embodiment of the second aspect of the present application includes the combustion chamber for suppressing combustion oscillation according to any one of the above embodiments, and the burner is a swirl cup structure burner, a multi-swirl burner or a center burner Staged burners.
  • the burner according to the embodiment of the present application includes the above-mentioned combustion chamber, it has all the technical effects of the above-mentioned combustion chamber, which will not be repeated here.
  • FIG. 1 is a schematic diagram of a partial structure of a combustion chamber for suppressing combustion oscillation provided by an embodiment of the present application
  • FIG. 2 is a schematic diagram of a partial structure of a spoiler provided by an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a partial structure of another spoiler provided by an embodiment of the present application.
  • FIG. 4 is a schematic diagram of a partial structure of still another spoiler provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of another partial structure of a combustion chamber for suppressing combustion oscillation provided by an embodiment of the present application.
  • FIG. 6 is a schematic diagram of another partial structure of a combustion chamber for suppressing combustion oscillation provided by an embodiment of the present application.
  • connection and “connected” should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, Or integral connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium.
  • connection should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection, Or integral connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium.
  • the first feature "on” or “under” the second feature may be in direct contact with the first and second features, or the first and second features pass through the middle indirect contact with the media.
  • the first feature being “above”, “over” and “above” the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature.
  • the first feature being “below”, “below” and “below” the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.
  • the combustion chamber includes a pre-combustion stage, a main combustion stage, a combustion chamber main body and an anti-vibration ring 7
  • the pre-combustion stage includes a central body 1 and the pre-combustion stage swirler 2 and the interstage section 3 arranged on the periphery of the central body 1
  • the main combustion stage is arranged on the periphery of the pre-combustion stage
  • the main combustion stage includes the main combustion stage swirler 4 and the main combustion stage outer ring 5
  • the main combustion chamber body includes an end wall 6 and a side wall 8, and the end wall 6 is connected to the main combustion stage outer ring 5 and the side wall 8
  • Outlet end, and the anti-vibration ring 7 is formed with a flame channel 71 that is gradually expanding in the direction away from the main combustion stage, the inlet end of the flame channel 71 is butted with the outlet end of the main combustion stage, and the outlet end of the
  • the anti-vibration ring 7 is formed with a flame channel 71 that gradually expands in the direction away from the main combustion stage.
  • a flame channel 71 that gradually expands in the direction away from the main combustion stage.
  • the channel 71 flows, so that the flame front will flow as close to the inner wall of the flame channel 71 as possible, thereby reducing the heat release rate pulsation, decoupling it from the combustion system acoustic system, and finally suppressing combustion oscillation.
  • combustion oscillation is generally suppressed by processing the end wall 6 or side wall 8 of the combustion chamber to have a conical transition structure, while the combustion chamber of the present application is only located at the outlet end face 11 and/or end wall of the outer ring.
  • the same effect can be achieved by installing the anti-vibration ring 7 on the inner surface; compared with the combustion chamber of the prior art, the combustion chamber of the present application has the advantages of low modification cost and wide application range.
  • the anti-vibration ring 7 is connected with the end wall 6 and/or the main combustion stage outer ring 5 by means of integral processing, welding or fastener connection.
  • the connection manner between the anti-vibration ring 7 and the end wall 6 and/or the main combustion stage outer ring 5 is not limited by the examples herein.
  • the anti-vibration ring 7 is a hollow cylinder, a hollow truncated cone or a hollow cubic structure.
  • the shape of the anti-vibration ring 7 is similar to that of the flame channel 71 , and the anti-vibration ring 7 is a hollow circular truncated structure, and gradually expands in the direction away from the main combustion stage shape extension.
  • the anti-vibration ring 7 designed in this way can reduce its thickness to the limit on the premise of ensuring the structural strength and thermal load, thereby reducing the weight of the combustion chamber.
  • the pre-stage, the main combustion stage, the combustion chamber main body and the anti-vibration ring 7 are all arranged coaxially.
  • the anti-vibration ring 7 extends in the axial direction of the central body 1 . It should be noted that the anti-vibration ring 7 may also extend in other directions, as long as the anti-vibration ring 7 has a flame channel 71 formed in the anti-vibration ring 7 which is gradually expanding in the direction away from the main combustion stage.
  • a spoiler is formed in the flame channel 71 .
  • the spoiler can change the flow trajectory of the flame front in the flame channel 71, and further improve the effect of the anti-vibration ring 7 in suppressing combustion oscillation.
  • the spoiler includes one or more of a step 711, an annular spoiler groove 712 and a longitudinal spoiler groove 713.
  • the structure of the spoiler is not limited by the examples here, as long as the flame front can be changed in the flame passage.
  • the flow trajectory in 71 is sufficient.
  • the spoiler includes a plurality of steps 711 distributed along the axial direction of the central body 1 . Based on the Coanda effect, the flame front is close to the step 711, and the step 711 interferes with the normal flow of the flame.
  • the spoiler portion includes a plurality of annular spoiler grooves 712 distributed along the axial direction of the central body 1 . Based on the Coanda effect, the flame flows circumferentially around the annular spoiler groove 712 .
  • the width f and the height e of the annular spoiler groove 712 are both in the range of 2-10 mm.
  • the spoiler includes a plurality of longitudinal spoiler grooves 713 penetrating the flame channel 71 along the axial direction of the central body 1 , and the longitudinal spoiler grooves 713 are along the flame channel Circumferential distribution of 71. Based on the Coanda effect, the flame is divided at the entrance end of the flame channel 71 by the respective longitudinal spoiler grooves 713.
  • the cross section of the inlet end of the flame channel 71 and the cross section of the outlet end of the flame channel 71 are both circular, or the cross section of the inlet end of the flame channel 71 and the cross section of the outlet end of the flame channel 71 are circular All are oval.
  • the cross section is circular or oval to satisfy the Coanda effect.
  • the shape of the flame channel 71 may also be: the cross section of the inlet end is circular, and the shape of the cross section of the outlet end is oval.
  • the diameter of the cross section of the inlet end of the flame channel 71 is 1-3 times the diameter D of the outlet end of the main combustion stage, and the channel side wall of the flame channel 71
  • the included angle ⁇ between the plane where the plane is located and the plane where the outlet end face 51 of the outer ring is located is in the range of 0-90°.
  • the maximum channel length of the flame channel 71 is 3 times the diameter D of the outlet end of the main combustion stage.
  • the dimension of the long axis of the cross section of the inlet end is 1-3 times the diameter D of the outlet end of the main combustion stage
  • the dimension of the short axis of the cross section of the inlet end is the size of the main combustion stage 1-3 times the diameter D of the outlet end.
  • the main changes are the included angle ⁇ and the channel length L 0 , different channel lengths L 0 provide different attachment areas for the flame, thereby changing the flame shape and suppressing the combustion chamber oscillation; at the same time, the change of the included angle ⁇ , due to the Coanda effect, will cause the fluid to follow the channel wall of the flame channel 71 .
  • the anti-vibration ring 7 is fixed on the inner surface of the end wall 6 , and the main variable is the distance between the side wall at the inlet of the flame channel 71 and the inner side wall of the outlet end face 11 of the outer ring.
  • Difference L different differences will lead to changes in the shape of the flame.
  • the main combustion stage flame 9 will have a double root state, which can play a beneficial role in the stability of the flame.
  • the pre-combustion stage flame 10 is generally stabilized at the two edge points of the interstage section 3 at the same time, and serves to provide a high temperature recirculation zone to keep the entire flame sustaining combustion.
  • the interstage section 3 includes an outlet end face of the interstage section
  • the main combustion stage swirler 4 includes an outlet end face of the main combustion stage swirler
  • the main combustion stage outer ring 5 includes an outer ring outlet end face 11
  • the combustion chamber end wall 6 includes the inner surface of the end wall; the outlet end face of the interstage section and the outlet end face 11 of the outer ring are arranged in a staggered position.
  • the dislocation of the outlet end face of the interstage section and the outlet end face 11 of the outer ring can change the starting position of the inner and outer shear layers of the swirl flow, thereby affecting the flame position in the inner cavity of the combustion chamber main body, and realizing the regulation of combustion oscillation.
  • the outlet end surface 11 of the outer ring and the inner surface of the end wall are coplanar, so as to facilitate the installation of other equipment such as the anti-vibration ring 7 in the combustion chamber.
  • the distance between the outlet end face of the main combustion stage swirler and the outlet end face of the interstage section along the axis direction of the central body 1 is the first distance; the outlet end face of the main combustion stage swirler and the outlet of the outer ring
  • the spacing distance between the end faces 11 along the axis of the center body 1 is the second spacing, the first spacing is greater than the second spacing, and the value of the first spacing is S.
  • the separation distance of the direction is H, where S and H are both set values, and both can take values in the corresponding interval, and H/S ⁇ 1.
  • the first distance is greater than the second distance, and the value of the second distance is S, and H/S ⁇ 1.
  • the first distance is smaller than the second distance, and the value of the first distance is S, and H/S ⁇ 1.
  • the first distance is smaller than the second distance, and the value of the second distance is S, and H/S ⁇ 1.
  • Another embodiment of the present application provides a burner, including the combustion chamber provided by any of the technical solutions of the present application.
  • the burners include, but are not limited to, conventional swirl cup burners, multi-swirl burners, and center stage burners.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)

Abstract

L'invention concerne une chambre de combustion pour la supprimer d'une oscillation de combustion, et un brûleur comprenant la chambre de combustion. La chambre de combustion comprend : un étage de précombustion, un étage de combustion principal, un corps de chambre de combustion et un anneau anti-oscillation (7) ; l'étage de précombustion comprend un corps central (1), et une coupelle de turbulence d'étage de précombustion (2) et une section inter-étage (3) qui sont ménagées sur la périphérie du corps central (1) ; l'étage de combustion principal est disposé sur la périphérie de l'étage de précombustion ; l'étage de combustion principal comprend une coupelle de turbulence d'étage de combustion principal (4) et un anneau externe d'étage de combustion principal (5) ; le corps de combustion comprend une paroi d'extrémité (6) et des parois latérales (8) ; la paroi d'extrémité (6) est reliée à l'anneau externe d'étage de combustion principal (5) et aux parois latérales (8) ; l'anneau anti-oscillation (7) est fixée à la surface interne de la paroi d'extrémité (6) et/ou à une extrémité de sortie de l'anneau externe d'étage de combustion principal (5) ; et un canal de flamme (71) qui est progressivement élargi dans une direction opposée à l'étage de combustion principal est formé dans l'anneau anti-oscillation (7). La chambre de combustion présente les avantages d'un faible coût de modernisation et d'une large gamme d'applications.
PCT/CN2021/080781 2021-03-15 2021-03-15 Chambre de combustion pour suppression d'oscillation de combustion, et brûleur WO2022193067A1 (fr)

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PCT/CN2021/080781 WO2022193067A1 (fr) 2021-03-15 2021-03-15 Chambre de combustion pour suppression d'oscillation de combustion, et brûleur

Applications Claiming Priority (1)

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PCT/CN2021/080781 WO2022193067A1 (fr) 2021-03-15 2021-03-15 Chambre de combustion pour suppression d'oscillation de combustion, et brûleur

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WO2022193067A1 true WO2022193067A1 (fr) 2022-09-22

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1426689A1 (fr) * 2002-11-19 2004-06-09 Siemens Westinghouse Power Corporation Chambre de combustion de turbine à gaz comprenant des brûleurs à prémélange ayant des géométries différentes
CN103123122A (zh) * 2012-12-31 2013-05-29 南京航空航天大学 一种主级燃油直接喷射的贫油预混预蒸发低污染燃烧室
CN108561898A (zh) * 2017-12-27 2018-09-21 中国航发四川燃气涡轮研究院 一种同轴分区高温升燃烧室头部
CN109737386A (zh) * 2018-12-11 2019-05-10 北京航空航天大学 双旋流低排放燃烧室
CN110107917A (zh) * 2019-04-23 2019-08-09 中国航空发动机研究院 径向燃油分级的槽道气帘淬熄燃烧室

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1426689A1 (fr) * 2002-11-19 2004-06-09 Siemens Westinghouse Power Corporation Chambre de combustion de turbine à gaz comprenant des brûleurs à prémélange ayant des géométries différentes
CN103123122A (zh) * 2012-12-31 2013-05-29 南京航空航天大学 一种主级燃油直接喷射的贫油预混预蒸发低污染燃烧室
CN108561898A (zh) * 2017-12-27 2018-09-21 中国航发四川燃气涡轮研究院 一种同轴分区高温升燃烧室头部
CN109737386A (zh) * 2018-12-11 2019-05-10 北京航空航天大学 双旋流低排放燃烧室
CN110107917A (zh) * 2019-04-23 2019-08-09 中国航空发动机研究院 径向燃油分级的槽道气帘淬熄燃烧室

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