Hydrogen and kerosene center staged dual-fuel combustion chamber

Abstract

The invention provides a hydrogen kerosene center staged dual-fuel combustion chamber which comprises a swirler, the swirler comprises a pre-combustion-stage liquid fuel nozzle, a pre-combustion-stage swirler structure and a main-combustion-stage swirler structure, and the pre-combustion-stage swirler structure and the main-combustion-stage swirler structure are sequentially arranged on the outer side of the pre-combustion-stage liquid fuel nozzle; a main combustion stage gas fuel channel, a main combustion stage liquid fuel channel and a pre-combustion stage gas fuel channel are arranged between the pre-combustion stage cyclone structure and the main combustion stage cyclone structure; the pre-combustion-stage cyclone structure is provided with a pre-combustion-stage gas fuel nozzle, and the pre-combustion-stage gas fuel nozzle communicates with the pre-combustion-stage gas fuel channel. The main combustion stage swirler structure is provided with a main combustion stage gas fuel nozzle and a main combustion stage liquid fuel nozzle, the main combustion stage gas fuel nozzle is communicated with the main combustion stage gas fuel channel, and the main combustion stage liquid fuel nozzle is communicated with the main combustion stage liquid fuel channel. And free mixing.

Description

Technical Field

[0001] The invention relates to the technical field of combustion chambers, and in particular to a hydrogen-kerosene centrally staged dual-fuel combustion chamber. Background Art

[0002] With the development of the aviation industry, the carbon emissions of the aviation industry have increased year by year. In order to respond to my country's "dual carbon" policy, it is necessary to reduce the carbon emissions of aircraft engines. The use of new energy such as hydrogen energy is one of the important ways to reduce carbon emissions of aircraft engines. However, the application of pure hydrogen fuel in aircraft engines faces a series of technical challenges. First, hydrogen fuel has the characteristics of low density and weak jet penetration, which leads to uneven mixing during the combustion process, which may cause local high-temperature hot spots and unstable combustion. Secondly, the high flame propagation speed, wide flammable range and high reactivity of hydrogen make pure hydrogen fuel gas turbines prone to flashback risks during design and operation. In addition, due to the high temperature of the hydrogen adiabatic flame, more nitrogen oxide pollution emissions may be generated during the combustion process, which poses a potential threat to environmental protection.

[0003] In order to overcome these technical difficulties, researchers began to explore how to improve combustion efficiency and mixing uniformity by optimizing the combustion chamber structure, and effectively reduce the risk of flashback and pollutant emissions. Among them, the research and development of pure hydrogen combustion technology has become an important direction. However, pure hydrogen combustion has a larger span than traditional kerosene combustion, and is more prone to oscillation and flashback problems, which further increases the difficulty of technical implementation. Adding hydrogen combustion to the traditional kerosene combustion chamber is seen as a potential solution. The kerosene combustion chamber atomizes the kerosene through a nozzle to form a liquid film, which is then peeled and broken at the end of the venturi to form smaller liquid mist particles. A cyclone is used to form a recirculation zone to achieve uniform mixing and efficient combustion of kerosene and air. However, most of the existing cyclones are designed for traditional kerosene combustion, and do not take into account the characteristics and needs of hydrogen combustion.

[0004] Therefore, how to effectively add hydrogen to the kerosene combustion chamber to achieve the co-combustion of the two fuels in order to improve combustion efficiency, stabilize the flame and reduce carbon emissions has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The present invention provides a hydrogen-kerosene central staged dual fuel combustion chamber to solve at least one of the above technical problems.

[0006] The present invention provides a hydrogen-kerosene central staged dual-fuel combustion chamber, comprising a swirler, wherein the swirler comprises a pre-combustion stage liquid fuel nozzle, a pre-combustion stage swirler structure and a main combustion stage swirler structure, wherein the pre-combustion stage swirler structure and the main combustion stage swirler structure are sequentially arranged around the outer side of the pre-combustion stage liquid fuel nozzle; A main combustion stage gas fuel channel, a main combustion stage liquid fuel channel and a pre-combustion stage gas fuel channel are provided between the pre-combustion stage swirler structure and the main combustion stage swirler structure; a pre-combustion stage gas fuel nozzle is provided on the pre-combustion stage swirler structure, and the pre-combustion stage gas fuel nozzle is connected to the pre-combustion stage gas fuel channel; a main combustion stage gas fuel nozzle and a main combustion stage liquid fuel nozzle are provided on the main combustion stage swirler structure, the main combustion stage gas fuel nozzle is connected to the main combustion stage gas fuel channel, and the main combustion stage liquid fuel nozzle is connected to the main combustion stage liquid fuel channel.

[0007] According to the hydrogen-kerosene central staged dual-fuel combustion chamber provided by the present invention, the pre-combustion stage swirler structure includes a primary swirler and a secondary swirler, the main combustion stage swirler structure includes a third-stage swirler, and the primary swirler, the second-stage swirler and the third-stage swirler are sequentially arranged around the outer side of the pre-combustion stage liquid fuel nozzle; Among them, the pre-combustion stage gas fuel nozzle is provided on the secondary swirler, and the main combustion stage gas fuel nozzle and the main combustion stage liquid fuel nozzle are provided on the tertiary swirler; the main combustion stage gas fuel channel, the main combustion stage liquid fuel channel and the pre-combustion stage gas fuel channel are all arranged between the secondary swirler and the tertiary swirler.

[0008] According to the hydrogen-kerosene central staged dual-fuel combustion chamber provided by the present invention, a pre-combustion stage gas fuel branch is configured inside the secondary swirler, a plurality of the pre-combustion stage gas fuel nozzles are circumferentially distributed at the end of the secondary swirler, and each of the pre-combustion stage gas fuel nozzles is connected to the pre-combustion stage gas fuel channel through the pre-combustion stage gas fuel branch; The third-stage cyclone is internally configured with a main combustion stage liquid fuel branch, a plurality of the main combustion stage liquid fuel nozzles are circumferentially distributed at the end of the third-stage cyclone, and each of the main combustion stage liquid fuel nozzles is connected to the main combustion stage liquid fuel channel through the main combustion stage liquid fuel branch; A main combustion stage gas fuel branch is also constructed inside the three-stage swirler, and a plurality of the main combustion stage gas fuel nozzles are distributed circumferentially at the end of the three-stage swirler, and each of the main combustion stage gas fuel nozzles is connected to the main combustion stage gas fuel channel through the main combustion stage gas fuel branch.

[0009] According to the hydrogen-kerosene central staged dual-fuel combustion chamber provided by the present invention, the first-stage swirler comprises a plurality of first-stage blades arranged at intervals along the circumferential direction; the second-stage swirler comprises a plurality of second-stage blades arranged at intervals along the circumferential direction and a swirler inner shell, the swirler inner shell being sleeved on the periphery of the plurality of second-stage blades; the third-stage swirler comprises a plurality of third-stage blades arranged at intervals along the circumferential direction; Among them, a number of the pre-combustion stage gas fuel nozzles are distributed circumferentially on the side wall of the swirler inner shell close to the first-stage swirler, and a number of the main combustion stage liquid fuel nozzles are distributed at the ends of a plurality of the third-stage blades, and each of the third-stage blades is provided with at least one main combustion stage liquid fuel nozzle arranged radially; a number of the main combustion stage gas fuel nozzles are distributed below the main combustion stage liquid fuel nozzles, and each of the third-stage blades is provided with at least one main combustion stage gas fuel nozzle arranged radially.

[0010] According to the hydrogen-kerosene centrally staged dual-fuel combustion chamber provided by the present invention, the main combustion stage gas fuel channel and / or the pre-combustion stage gas fuel channel are arranged around the main combustion stage liquid fuel channel to wrap the main combustion stage liquid fuel channel.

[0011] According to the hydrogen-kerosene centrally staged dual-fuel combustion chamber provided by the present invention, when the main combustion stage gas fuel channel and the pre-combustion stage gas fuel channel are combined to surround the main combustion stage liquid fuel channel, the pre-combustion stage gas fuel channel is located on the side of the main combustion stage liquid fuel channel close to the pre-combustion stage liquid fuel nozzle.

[0012] According to the hydrogen-kerosene central staged dual-fuel combustion chamber provided by the present invention, the main combustion stage gas fuel channel includes a main combustion stage gas fuel collecting cavity and a main combustion stage gas fuel delivery pipe, the main combustion stage gas fuel delivery pipe is connected to the main combustion stage gas fuel collecting cavity, and the main combustion stage gas fuel delivery pipe is used to pass the main combustion stage gas fuel; The main combustion stage liquid fuel channel comprises a main combustion stage liquid fuel collection chamber and a main combustion stage liquid fuel delivery pipe, the main combustion stage liquid fuel delivery pipe is connected to the main combustion stage liquid fuel collection chamber, and the main combustion stage liquid fuel delivery pipe is used to introduce the main combustion stage liquid fuel; The pre-combustion stage gas fuel channel includes a pre-combustion stage gas fuel collecting cavity and a pre-combustion stage gas fuel delivery pipe, the pre-combustion stage gas fuel delivery pipe is connected to the pre-combustion stage gas fuel collecting cavity, and the pre-combustion stage gas fuel delivery pipe is used to introduce the pre-combustion stage gas fuel.

[0013] According to the hydrogen-kerosene central staged dual-fuel combustion chamber provided by the present invention, the main combustion stage liquid fuel channel includes M main combustion stage liquid fuel delivery pipes, the main combustion stage gas fuel channel includes M main combustion stage gas fuel delivery pipes, and the pre-combustion stage gas fuel channel includes N pre-combustion stage gas fuel delivery pipes, wherein M is a positive integer greater than or equal to 2, N is a positive integer greater than or equal to 1, and M>N; Among them, one of the main combustion stage gas fuel delivery pipes and one of the pre-combustion stage gas fuel delivery pipes are combined to form a gas fuel delivery pipe group, and P groups of gas fuel delivery pipe groups are wrapped one by one around the periphery of P main combustion stage liquid fuel delivery pipes, and the remaining main combustion stage gas fuel delivery pipes are wrapped one by one around the periphery of the remaining main combustion stage liquid fuel delivery pipes, wherein P is a positive integer greater than or equal to 1, and P <M。

[0014] According to the hydrogen-kerosene centrally staged dual-fuel combustion chamber provided by the present invention, the liquid inlet end of the pre-combustion stage liquid fuel nozzle is connected to a pre-combustion stage liquid fuel delivery pipe, and the swirler also includes a venturi tube, which is arranged between the first-stage swirler and the second-stage swirler.

[0015] The hydrogen-kerosene centrally staged dual-fuel combustion chamber provided by the present invention further includes a flame tube and a splash plate, wherein the swirler is embedded in the top of the flame tube, the splash plate is arranged on the inner wall of the top of the flame tube, and the splash plate exposes the swirler.

[0016] The above technical solution of the present invention has the following beneficial effects: The hydrogen-kerosene centrally staged dual-fuel combustion chamber of the present invention is provided with a main combustion stage gas fuel channel, a main combustion stage liquid fuel channel and a pre-combustion stage gas fuel channel between the pre-combustion stage cyclone structure and the main combustion stage cyclone structure of the cyclone, and a pre-combustion stage gas fuel nozzle is provided on the pre-combustion stage cyclone structure so that the pre-combustion stage gas fuel nozzle is connected with the pre-combustion stage gas fuel channel; and a main combustion stage gas fuel nozzle and a main combustion stage liquid fuel nozzle are provided on the main combustion stage cyclone structure so that the main combustion stage gas fuel nozzle is connected with the main combustion stage gas fuel channel, and the main combustion stage liquid fuel nozzle is connected with the main combustion stage liquid fuel channel; the use of such independently arranged two-stage dual-fuel channels can realize the joint combustion of gas fuel and liquid fuel to improve combustion efficiency and reduce carbon emissions; at the same time, the staged supply and zoned combustion mode of gas fuel and liquid fuel can make the two-stage dual fuels separately regulated to realize free mixing, thereby realizing uniform and efficient combustion under the condition of optimal mixing ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A cross-sectional view of a hydrogen-kerosene centrally staged dual-fuel combustion chamber provided in an embodiment of the present invention; Figure 2 A top view of a cyclone provided in an embodiment of the present invention; Figure 3 for Figure 2 A cross-sectional view of the cyclone shown in FIG. 1 along the AA section line; Figure 4 for Figure 2 A cross-sectional view of the cyclone shown in FIG. 1 along the BB section line; Figure 5 A schematic structural diagram of a three-stage cyclone provided by an embodiment of the present invention; Figure 6 A schematic diagram of the arrangement of the main combustion stage gas fuel delivery pipe, the main combustion stage liquid fuel delivery pipe and the pre-combustion stage gas fuel delivery pipe of the swirler provided in an embodiment of the present invention.

[0019] Reference numerals: 1. Pre-combustion stage liquid fuel nozzle; 2. Pre-combustion stage liquid fuel delivery pipe; 3. Primary swirler; 4. Venturi tube; 5. Secondary swirler; 6. Third-stage swirler; 7. Swirler housing; 8. Swirler; 9. Flame tube; 10. Splash plate; 31. First support; 32. Primary blade; 51. Second support; 52. Secondary blade; 53. Swirler inner shell; 61. Third support; 62. Third-stage blade; 100. Main combustion stage gas fuel channel; 200. Main combustion stage liquid fuel channel; 30 0. Pre-combustion stage gas fuel channel; 501. Pre-combustion stage gas fuel nozzle; 502. Pre-combustion stage gas fuel branch; 601. Main combustion stage gas fuel nozzle; 602. Main combustion stage liquid fuel nozzle; 603. Main combustion stage liquid fuel branch; 101. Main combustion stage gas fuel collecting cavity; 102. Main combustion stage gas fuel delivery pipe; 201. Main combustion stage liquid fuel collecting cavity; 202. Main combustion stage liquid fuel delivery pipe; 301. Pre-combustion stage gas fuel collecting cavity; 302. Pre-combustion stage gas fuel delivery pipe. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1 The present invention provides a hydrogen-kerosene centrally staged dual-fuel combustion chamber, the combustion chamber comprising at least one swirler 8, a flame tube 9 and a splash plate 10, the swirler 8 being embedded in the top of the flame tube 9, the splash plate 10 being arranged on the inner wall of the top of the flame tube 9, and the splash plate 10 exposing the swirler 8.

[0022] The number of cyclones 8 may be determined according to actual conditions and is not limited here.

[0023] Specifically, see Figure 2-Figure 4 The swirler 8 includes a pre-combustion stage liquid fuel nozzle 1, a pre-combustion stage swirler structure and a main combustion stage swirler structure. The pre-combustion stage liquid fuel nozzle 1 is located at the center of the swirler, and is used to spray the pre-combustion stage liquid fuel into the pre-combustion zone. The pre-combustion stage swirler structure and the main combustion stage swirler structure are sequentially arranged around the outside of the pre-combustion stage liquid fuel nozzle 1. A main combustion stage gas fuel channel 100, a main combustion stage liquid fuel channel 200 and a pre-combustion stage gas fuel channel 300 are provided between the pre-combustion stage swirler structure and the main combustion stage swirler structure. A pre-combustion stage gas fuel nozzle 501 is provided on the pre-combustion stage swirler structure, and the pre-combustion stage gas fuel nozzle 501 is connected to the pre-combustion stage gas fuel channel 300, and is used to spray the pre-combustion stage gas fuel into the pre-combustion zone. The main combustion stage swirler structure is provided with a main combustion stage gas fuel nozzle 601 and a main combustion stage liquid fuel nozzle 602. The main combustion stage gas fuel nozzle 601 is connected to the main combustion stage gas fuel channel 100, and the main combustion stage gas fuel nozzle 601 is used to spray the main combustion stage gas fuel into the main combustion zone; the main combustion stage liquid fuel nozzle 602 is connected to the main combustion stage liquid fuel channel 200, and the main combustion stage liquid fuel nozzle 602 is used to spray the main combustion stage liquid fuel into the main combustion zone.

[0024] The combustion chamber of the present invention adopts a zoned combustion mode, a pre-combustion stage liquid fuel nozzle 1 is arranged at the center position of the swirler 8, and independent main combustion stage gas fuel channels 100, main combustion stage liquid fuel channels 200 and pre-combustion stage gas fuel channels 300 are arranged between the pre-combustion stage swirler structure and the main combustion stage swirler structure, and each fuel channel is connected to the corresponding fuel nozzle to realize the joint combustion of gas fuel and liquid fuel, and at the same time, the gas fuel and liquid fuel can be supplied in stages respectively, so that the injection amount and injection speed of the dual fuels (gas fuel and liquid fuel) can be controlled in stages, and the free mixing of the dual fuels can be realized, thereby realizing uniform and efficient combustion under the condition of the optimal mixing ratio, improving combustion efficiency, and reducing carbon emissions.

[0025] The liquid fuel of the present invention may be kerosene, and the gaseous fuel may be hydrogen, but the present invention is not limited thereto. Based on the traditional kerosene combustion chamber, the present invention improves the structure of the swirler to achieve the co-combustion of kerosene and hydrogen, thereby obtaining a dual-fuel combustion chamber with higher combustion efficiency, more stable flame and lower carbon emissions.

[0026] Specifically, see Figure 2 and Figure 3 The pre-combustion stage swirler structure includes a primary swirler 3 and a secondary swirler 5, and the main combustion stage swirler structure includes a tertiary swirler 6. The primary swirler 3, the secondary swirler 5 and the tertiary swirler 6 are sequentially arranged outside the pre-combustion stage liquid fuel nozzle 1. Among them, the pre-combustion stage gas fuel nozzle 501 is arranged on the secondary swirler 5, and the main combustion stage gas fuel nozzle 601 and the main combustion stage liquid fuel nozzle 602 are both arranged on the tertiary swirler 6. The main combustion stage gas fuel channel 100, the main combustion stage liquid fuel channel 200 and the pre-combustion stage gas fuel channel 300 are all arranged between the secondary swirler 5 and the tertiary swirler 6.

[0027] The primary cyclone 3 includes a first support body 31 and a plurality of primary blades 32, the plurality of primary blades 32 are fixed to the periphery of the first support body 31, and the plurality of primary blades 32 are arranged at intervals along the circumference of the primary cyclone 3. The secondary cyclone 5 includes a second support body 51, a plurality of secondary blades 52 and a cyclone inner shell 53, the plurality of secondary blades 52 are fixed to the periphery of the second support body 51, and the plurality of secondary blades 52 are arranged at intervals along the circumference of the secondary cyclone 5, and the cyclone inner shell 53 is sleeved on the periphery of the plurality of secondary blades 52. The tertiary cyclone 6 includes a third support body 61 and a plurality of tertiary blades 62, the plurality of tertiary blades 62 are fixed to the periphery of the third support body 61, and the plurality of tertiary blades 62 are arranged at intervals along the circumference of the tertiary cyclone 6.

[0028] It can be understood that the inner area of ​​the swirler inner shell 53 corresponds to the pre-combustion zone, and the outer area of ​​the swirler inner shell 53 corresponds to the main combustion zone.

[0029] like Figure 3 As shown, the liquid inlet end of the pre-combustion level liquid fuel nozzle 1 is connected to a pre-combustion level liquid fuel delivery pipe 2, and the pre-combustion level liquid fuel delivery pipe 2 is used to pass the pre-combustion level liquid fuel. The swirler also includes a venturi 4, and the inlet end of the venturi 4 is arranged between the primary swirler 3 and the secondary swirler 5. The pre-combustion level liquid fuel entering the pre-combustion level liquid fuel delivery pipe 2 is atomized and sprayed through the pre-combustion level liquid fuel nozzle 1 to form a liquid film, and the liquid film is then peeled and broken at the outlet end of the venturi 4 to form smaller liquid mist particles, and the primary swirler 3 is used to form a recirculation zone, so that the liquid fuel and air are evenly mixed and efficiently burned in the pre-combustion zone.

[0030] Among them, the interior of the secondary swirler 5 is constructed with a pre-combustion stage gas fuel branch 502, and a plurality of pre-combustion stage gas fuel nozzles 501 are distributed circumferentially at the end of the secondary swirler 5, and each pre-combustion stage gas fuel nozzle 501 is connected to the pre-combustion stage gas fuel channel 300 through the pre-combustion stage gas fuel branch 502.

[0031] The third-stage cyclone 6 is internally constructed with a main combustion stage liquid fuel branch 603, and a plurality of main combustion stage liquid fuel nozzles 602 are circumferentially distributed at the end of the third-stage cyclone 6, and each of the main combustion stage liquid fuel nozzles 602 is connected to the main combustion stage liquid fuel channel 200 through the main combustion stage liquid fuel branch 603. The third-stage cyclone 6 is also internally constructed with a main combustion stage gas fuel branch (not shown), and a plurality of main combustion stage gas fuel nozzles 601 are circumferentially distributed at the end of the third-stage cyclone 6, and each of the main combustion stage gas fuel nozzles 601 is connected to the main combustion stage gas fuel channel 100 through the main combustion stage gas fuel branch.

[0032] Among them, the main combustion stage liquid fuel branch 603 and the main combustion stage gas fuel branch are set independently of each other, so as to control the intake amount and flow rate of the main combustion stage liquid fuel and the main combustion stage gas fuel respectively.

[0033] It can be understood that the cyclone usually includes an air inlet side and an air outlet side, and the air enters the cyclone from the air inlet side and is mixed with the fuel at the air outlet side. The end of the secondary cyclone 5 refers to the end of the secondary cyclone 5 close to the air outlet side, and the end of the tertiary cyclone 6 refers to the end of the tertiary cyclone 6 close to the air outlet side.

[0034] Specifically, see Figure 3 and Figure 5A plurality of pre-combustion stage gas fuel nozzles 501 are circumferentially distributed on the side wall of the swirler inner shell 53 near the primary swirler 3, that is, the pre-combustion stage gas fuel nozzles 501 face the pre-combustion zone, and the pre-combustion stage gas fuel entering the pre-combustion stage gas fuel channel 300 flows through the pre-combustion stage gas fuel branch 502 and is ejected toward the pre-combustion zone through the pre-combustion stage gas fuel nozzles 501. The specific flow direction is as follows: Figure 3 As shown by the middle arrow, the ejected pre-combustion gas fuel utilizes the recirculation zone formed by the secondary swirler 5 to achieve uniform mixing of the gas fuel and air in the pre-combustion zone.

[0035] A plurality of main combustion stage liquid fuel nozzles 602 are distributed at the ends of a plurality of tertiary blades 62, and each tertiary blade 62 is provided with at least one main combustion stage liquid fuel nozzle 602 arranged radially along the tertiary swirler 6. The main combustion stage liquid fuel entering the main combustion stage liquid fuel passage 200 flows through the main combustion stage liquid fuel branch 603 and is ejected toward the main combustion zone through the main combustion stage liquid fuel nozzle 602. The specific flow direction is as follows: Figure 3 As shown by the arrow in the middle, the ejected main combustion stage liquid fuel utilizes the recirculation zone formed by the three-stage swirler 6 to achieve uniform mixing of the liquid fuel and air in the main combustion zone.

[0036] A plurality of main combustion stage gas fuel nozzles 601 are distributed below the main combustion stage liquid fuel nozzle 602 (i.e., on the side close to the air outlet side), and each third-stage blade 62 is provided with at least one main combustion stage gas fuel nozzle 601 arranged along the radial direction of the third-stage swirler 6. The main combustion stage gas fuel entering the main combustion stage gas fuel channel 100 flows through the main combustion stage gas fuel branch and is ejected toward the main combustion zone through the main combustion stage gas fuel nozzle 601. The specific flow direction is as follows: Figure 3 As shown by the arrow in the middle, the ejected main combustion gas fuel utilizes the recirculation zone formed by the three-stage swirler 6 to achieve uniform mixing of the gas fuel and air in the main combustion zone.

[0037] The number of the main combustion stage liquid fuel nozzles 602 and the main combustion stage gas fuel nozzles 601 on each three-stage blade 62 can be specifically set according to the actual incoming flow rate and combustion needs. For example, the main combustion stage gas fuel nozzles 601 on each three-stage blade 62 can be arranged in the form of double openings, single openings or multiple openings. The arrangement of the main combustion stage liquid fuel nozzles 602 is similar to that, and will not be repeated here.

[0038] This embodiment is explained by taking kerosene as the liquid fuel and hydrogen as the gas fuel as an example. The swirler adopts a staged fuel supply and zoned combustion mode. A pre-combustion stage liquid fuel nozzle 1 (such as a pressure atomizing nozzle) is installed in the center of the swirler to supply kerosene to the pre-combustion stage; a main combustion stage liquid fuel nozzle 602 is opened at the end of the blade of the third-stage swirler 6 to supply kerosene to the main combustion stage. The swirler of the present invention also adopts a staged gas supply and zoned combustion mode. A pre-combustion stage gas fuel nozzle 501 is opened at the end of the blade of the second-stage swirler 5 to supply hydrogen to the pre-combustion stage; a main combustion stage gas fuel nozzle 601 is opened on the lower side of the main combustion stage liquid fuel nozzle 602 of the third-stage swirler 6 to supply hydrogen to the main combustion stage. The hydrogen and kerosene combustion modes can be regulated and switched freely to perform dual-fuel mixed combustion or single fuel switching combustion.

[0039] In addition, since the air flows from the air inlet side to the air outlet side of the cyclone, air without fuel will not burn. Similarly, fuel (such as pure hydrogen and kerosene) without air will not burn. Since the airflow flows downward (towards the air outlet side) as a whole, the fuel sprayed from the end of the blade will not flow upward (towards the air inlet side), that is, the upstream airflow is pure air and will not burn. This ensures that combustion occurs in the flame tube of the combustion chamber, thereby avoiding flashback and making the flame more stable, so as to solve the problem of flashback affecting the cyclone blades and fuel delivery channels.

[0040] See also Figure 3 , Figure 4 and Figure 6 The main combustion stage gas fuel channel 100 and / or the pre-combustion stage gas fuel channel 300 are arranged around the main combustion stage liquid fuel channel 200 to wrap the main combustion stage liquid fuel channel 200. Since the thermal conductivity of gas fuel (such as hydrogen) is poor, the main combustion stage liquid fuel channel 200 is wrapped by the main combustion stage gas fuel channel 100 and / or the pre-combustion stage gas fuel channel 300, which can play the effect of keeping the liquid fuel (such as kerosene) warm.

[0041] It should be noted that the main combustion stage gas fuel channel 100 and the pre-combustion stage gas fuel channel 300 can be combined to form a gas fuel channel to jointly wrap the main combustion stage liquid fuel channel 200; or, the main combustion stage liquid fuel channel 200 can be wrapped by only one of the main combustion stage gas fuel channel 100 and the pre-combustion stage gas fuel channel 300, which can be determined according to the actual fuel demand and flow rate.

[0042] In which, when the main combustion stage gas fuel channel 100 and the pre-combustion stage gas fuel channel 300 are combined to surround the main combustion stage liquid fuel channel 200, the pre-combustion stage gas fuel channel 300 is located on the side of the main combustion stage liquid fuel channel 200 close to the pre-combustion stage liquid fuel nozzle 1, so that the pre-combustion stage gas fuel channel 300 is connected with the pre-combustion stage gas fuel nozzle 501.

[0043] Specifically, the main combustion stage gas fuel channel 100 includes a main combustion stage gas fuel collecting chamber 101 and a main combustion stage gas fuel delivery pipe 102, the main combustion stage gas fuel delivery pipe 102 is connected to the main combustion stage gas fuel collecting chamber 101, and the main combustion stage gas fuel delivery pipe 102 is used to introduce the main combustion stage gas fuel. The main combustion stage liquid fuel channel 200 includes a main combustion stage liquid fuel collecting chamber 201 and a main combustion stage liquid fuel delivery pipe 202, the main combustion stage liquid fuel delivery pipe 202 is connected to the main combustion stage liquid fuel collecting chamber 201, and the main combustion stage liquid fuel delivery pipe 202 is used to introduce the main combustion stage liquid fuel. The pre-combustion stage gas fuel channel 300 includes a pre-combustion stage gas fuel collecting chamber 301 and a pre-combustion stage gas fuel delivery pipe 302, the pre-combustion stage gas fuel delivery pipe 302 is connected to the pre-combustion stage gas fuel collecting chamber 301, and the pre-combustion stage gas fuel delivery pipe 302 is used to introduce the pre-combustion stage gas fuel.

[0044] Among them, the main combustion stage gas fuel collecting cavity 101 and the pre-combustion stage gas fuel collecting cavity 301 are used to store the gas fuel of the main combustion stage and the pre-combustion stage respectively, and are both arranged around the secondary cyclone 5 so as to evenly transport the gas fuel to the gas fuel nozzle of the corresponding combustion stage. The main combustion stage liquid fuel collecting cavity 201 is used to store the main combustion stage liquid fuel, and is arranged around the secondary cyclone 5 so as to evenly transport the liquid fuel to the main combustion stage liquid fuel nozzle.

[0045] The number of the main combustion stage gas fuel delivery pipe 102, the main combustion stage liquid fuel delivery pipe 202 and the pre-combustion stage gas fuel delivery pipe 302 can be determined according to the actual fuel demand. In this embodiment, considering that the pre-combustion stage gas fuel flow rate is relatively low, preferably, the number of the pre-combustion stage gas fuel delivery pipe 302 can be less than the number of the main combustion stage gas fuel delivery pipe 102 and the main combustion stage liquid fuel delivery pipe 202.

[0046] Specifically, the main combustion stage liquid fuel channel 200 includes M main combustion stage liquid fuel delivery pipes 202, the main combustion stage gas fuel channel 100 includes M main combustion stage gas fuel delivery pipes 102, and the pre-combustion stage gas fuel channel 300 includes N pre-combustion stage gas fuel delivery pipes 302, wherein M is a positive integer greater than or equal to 2, N is a positive integer greater than or equal to 1, and M>N.

[0047] Among them, a main combustion stage gas fuel delivery pipe 102 and a pre-combustion stage gas fuel delivery pipe 302 are combined to form a gas fuel delivery pipe group, and P groups of gas fuel delivery pipe groups are wrapped around the periphery of P main combustion stage liquid fuel delivery pipes 202 one by one, and the remaining main combustion stage gas fuel delivery pipes 102 are wrapped around the periphery of the remaining main combustion stage liquid fuel delivery pipes 202 one by one, wherein P is a positive integer greater than or equal to 1, and P <M。

[0048] By adopting such a design, the liquid fuel can be kept warm while meeting the flow requirements of the fuel at each level. Of course, the present invention is not limited thereto, and the number and layout of the fuel delivery pipes at each level can also be adjusted according to actual conditions.

[0049] For example, Figure 6 As shown, in one embodiment, four main combustion stage gas fuel delivery pipes 102 extend outward from the main combustion stage gas fuel collecting cavity 101, four main combustion stage liquid fuel delivery pipes 202 extend outward from the main combustion stage liquid fuel collecting cavity 201, and two pre-combustion stage gas fuel delivery pipes 302 extend outward from the pre-combustion stage gas fuel collecting cavity 301, wherein two groups of gas fuel delivery pipe groups are wrapped around the periphery of the two main combustion stage liquid fuel delivery pipes 202 in a one-to-one manner, and the remaining two main combustion stage gas fuel delivery pipes 102 are wrapped around the periphery of the two main combustion stage liquid fuel delivery pipes 202 in a one-to-one manner, thereby achieving the effect of keeping the liquid fuel warm.

[0050] The hydrogen-kerosene centrally staged dual-fuel combustion chamber of the present invention is provided with a main combustion stage gas fuel channel, a main combustion stage liquid fuel channel and a pre-combustion stage gas fuel channel between the pre-combustion stage cyclone structure and the main combustion stage cyclone structure of the cyclone, and a pre-combustion stage gas fuel nozzle is provided on the pre-combustion stage cyclone structure so that the pre-combustion stage gas fuel nozzle is connected with the pre-combustion stage gas fuel channel; and a main combustion stage gas fuel nozzle and a main combustion stage liquid fuel nozzle are provided on the main combustion stage cyclone structure so that the main combustion stage gas fuel nozzle is connected with the main combustion stage gas fuel channel, and the main combustion stage liquid fuel nozzle is connected with the main combustion stage liquid fuel channel; the use of such independently arranged two-stage dual-fuel channels can realize the joint combustion of gas fuel and liquid fuel to improve combustion efficiency and reduce carbon emissions; at the same time, the staged supply and zoned combustion mode of gas fuel and liquid fuel can make the two-stage dual fuels separately regulated to realize free mixing, thereby realizing uniform and efficient combustion under the condition of optimal mixing ratio.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydrogen-kerosene central staged dual fuel combustion chamber, characterized in that: The swirler comprises a pre-combustion stage liquid fuel nozzle, a pre-combustion stage swirler structure and a main combustion stage swirler structure, wherein the pre-combustion stage swirler structure and the main combustion stage swirler structure are sequentially arranged around the outside of the pre-combustion stage liquid fuel nozzle; A main combustion stage gas fuel channel, a main combustion stage liquid fuel channel and a pre-combustion stage gas fuel channel are provided between the pre-combustion stage swirler structure and the main combustion stage swirler structure; a pre-combustion stage gas fuel nozzle is provided on the pre-combustion stage swirler structure, and the pre-combustion stage gas fuel nozzle is connected to the pre-combustion stage gas fuel channel; a main combustion stage gas fuel nozzle and a main combustion stage liquid fuel nozzle are provided on the main combustion stage swirler structure, the main combustion stage gas fuel nozzle is connected to the main combustion stage gas fuel channel, and the main combustion stage liquid fuel nozzle is connected to the main combustion stage liquid fuel channel.

2. The hydrogen-kerosene central staged dual fuel combustion chamber according to claim 1, characterized in that: The pre-combustion stage swirler structure includes a primary swirler and a secondary swirler, and the main combustion stage swirler structure includes a third-stage swirler, wherein the primary swirler, the second-stage swirler and the third-stage swirler are sequentially arranged around the outer side of the pre-combustion stage liquid fuel nozzle; Among them, the pre-combustion stage gas fuel nozzle is provided on the secondary swirler, and the main combustion stage gas fuel nozzle and the main combustion stage liquid fuel nozzle are provided on the tertiary swirler; the main combustion stage gas fuel channel, the main combustion stage liquid fuel channel and the pre-combustion stage gas fuel channel are all arranged between the secondary swirler and the tertiary swirler.

3. The hydrogen-kerosene central staged dual fuel combustion chamber according to claim 2, characterized in that: The secondary swirler is internally configured with a pre-combustion stage gas fuel branch, a plurality of the pre-combustion stage gas fuel nozzles are circumferentially distributed at the end of the secondary swirler, and each of the pre-combustion stage gas fuel nozzles is connected to the pre-combustion stage gas fuel channel through the pre-combustion stage gas fuel branch; The third-stage cyclone is internally configured with a main combustion stage liquid fuel branch, a plurality of the main combustion stage liquid fuel nozzles are circumferentially distributed at the end of the third-stage cyclone, and each of the main combustion stage liquid fuel nozzles is connected to the main combustion stage liquid fuel channel through the main combustion stage liquid fuel branch; A main combustion stage gas fuel branch is also constructed inside the three-stage swirler, and a plurality of the main combustion stage gas fuel nozzles are distributed circumferentially at the end of the three-stage swirler, and each of the main combustion stage gas fuel nozzles is connected to the main combustion stage gas fuel channel through the main combustion stage gas fuel branch.

4. The hydrogen-kerosene central staged dual fuel combustion chamber according to claim 3, characterized in that: The first-stage cyclone comprises a plurality of first-stage blades arranged at intervals along the circumferential direction; the second-stage cyclone comprises a plurality of second-stage blades arranged at intervals along the circumferential direction and a cyclone inner shell, wherein the cyclone inner shell is sleeved around the periphery of the plurality of second-stage blades; the third-stage cyclone comprises a plurality of third-stage blades arranged at intervals along the circumferential direction; Among them, a number of the pre-combustion stage gas fuel nozzles are distributed circumferentially on the side wall of the swirler inner shell close to the first-stage swirler, and a number of the main combustion stage liquid fuel nozzles are distributed at the ends of a plurality of the third-stage blades, and each of the third-stage blades is provided with at least one main combustion stage liquid fuel nozzle arranged radially; a number of the main combustion stage gas fuel nozzles are distributed below the main combustion stage liquid fuel nozzles, and each of the third-stage blades is provided with at least one main combustion stage gas fuel nozzle arranged radially.

5. The hydrogen-kerosene central staged dual fuel combustion chamber according to any one of claims 1 to 4, characterized in that: The main combustion stage gas fuel passage and / or the pre-combustion stage gas fuel passage are arranged around the main combustion stage liquid fuel passage to wrap the main combustion stage liquid fuel passage.

6. The hydrogen-kerosene central staged dual fuel combustion chamber according to claim 5, characterized in that: When the main combustion stage gas fuel passage and the pre-combustion stage gas fuel passage are combined to surround the main combustion stage liquid fuel passage, the pre-combustion stage gas fuel passage is located on a side of the main combustion stage liquid fuel passage close to the pre-combustion stage liquid fuel nozzle.

7. The hydrogen-kerosene central staged dual fuel combustion chamber according to claim 5, characterized in that: The main combustion stage gas fuel channel comprises a main combustion stage gas fuel collecting cavity and a main combustion stage gas fuel delivery pipe, the main combustion stage gas fuel delivery pipe is connected with the main combustion stage gas fuel collecting cavity, and the main combustion stage gas fuel delivery pipe is used to pass the main combustion stage gas fuel; The main combustion stage liquid fuel channel comprises a main combustion stage liquid fuel collection chamber and a main combustion stage liquid fuel delivery pipe, the main combustion stage liquid fuel delivery pipe is connected to the main combustion stage liquid fuel collection chamber, and the main combustion stage liquid fuel delivery pipe is used to introduce the main combustion stage liquid fuel; The pre-combustion stage gas fuel channel includes a pre-combustion stage gas fuel collecting cavity and a pre-combustion stage gas fuel delivery pipe, the pre-combustion stage gas fuel delivery pipe is connected to the pre-combustion stage gas fuel collecting cavity, and the pre-combustion stage gas fuel delivery pipe is used to introduce the pre-combustion stage gas fuel.

8. The hydrogen-kerosene central staged dual fuel combustion chamber according to claim 7, characterized in that: The main combustion stage liquid fuel channel includes M main combustion stage liquid fuel delivery pipes, the main combustion stage gas fuel channel includes M main combustion stage gas fuel delivery pipes, and the pre-combustion stage gas fuel channel includes N pre-combustion stage gas fuel delivery pipes, wherein M is a positive integer greater than or equal to 2, N is a positive integer greater than or equal to 1, and M>N; Among them, one of the main combustion stage gas fuel delivery pipes and one of the pre-combustion stage gas fuel delivery pipes are combined to form a gas fuel delivery pipe group, and P groups of gas fuel delivery pipe groups are wrapped one by one around the periphery of P main combustion stage liquid fuel delivery pipes, and the remaining main combustion stage gas fuel delivery pipes are wrapped one by one around the periphery of the remaining main combustion stage liquid fuel delivery pipes, wherein P is a positive integer greater than or equal to 1, and P <M。 9. The hydrogen-kerosene central staged dual fuel combustion chamber according to claim 2, characterized in that: The liquid inlet end of the pre-combustion stage liquid fuel nozzle is connected to a pre-combustion stage liquid fuel delivery pipe, and the swirler further includes a venturi tube, which is arranged between the first-stage swirler and the second-stage swirler.

10. The hydrogen-kerosene central staged dual fuel combustion chamber according to claim 1, characterized in that: It also includes a flame tube and a splash plate. The swirler is embedded in the top of the flame tube, the splash plate is arranged on the inner wall of the top of the flame tube, and the splash plate exposes the swirler.

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