Dual fuel center staged multi-flame combustor

Abstract

The present application relates to the technical field of combustion chamber, provide a kind of dual-fuel center staging multi-flame combustion chamber, comprising: combustion chamber body, precombustion stage device, first main combustion stage device and second main combustion stage device, precombustion stage device, first main combustion stage device and second main combustion stage device are respectively arranged in the front end of combustion chamber body;Precombustion stage device includes precombustion stage component and precombustion mixing chamber, precombustion mixing chamber is communicated with combustion chamber body, first passage and second passage are arranged in precombustion stage component, first passage and precombustion mixing chamber are communicated, first passage, precombustion mixing chamber and combustion chamber body are coaxially arranged, first fuel enters precombustion mixing chamber by first passage;Precombustion mixing chamber is arranged at the periphery of second passage, second passage is communicated with precombustion mixing chamber, second fuel enters precombustion mixing chamber by second passage;First main combustion stage device is provided with third passage, second main combustion stage device is provided with fourth passage, fourth passage is communicated with third passage, third passage is communicated with combustion chamber body.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of combustion chambers, in particular to a dual-fuel center-staged multi-flame combustion chamber. BACKGROUND

[0002] In aircraft power systems, the design of combustion chambers is one of the key technologies. Among them, the center-staged multi-flame combustion chamber has shown significant advantages in widening the stable working range of the combustion chamber, reducing local rich oil area, and reducing soot generation, etc. Through the staged design of the nozzle, the combustion chamber can realize stable combustion state according to different working condition requirements, thereby effectively improving the combustion efficiency and combustion uniformity. Further, through the precise adjustment of the nozzle position, the temperature distribution at the outlet of the combustion chamber can also be finely adjusted to meet the strict requirements of the engine on temperature uniformity.

[0003] However, although the center-staged multi-flame combustion chamber performs well in many aspects, its fuel distribution is uneven, and the combustion is incomplete under high load and high speed conditions. These problems not only limit the performance of the combustion chamber, but also may lead to the decline of the overall efficiency and stability of the engine, thereby affecting the overall performance of the aircraft. Especially under high throughflow conditions, the ignition and self-stable flame performance of kerosene as fuel is poor, which further aggravates the problem of incomplete combustion.

[0004] Pure hydrogen combustion chambers, such as hydrogen diffusion combustion chambers and hydrogen micro-mixing combustion chambers, have unique advantages in high-temperature and high-efficiency combustion. However, under high throughflow conditions, the combustion process of hydrogen is prone to cause thermal acoustic oscillation, leading to unstable combustion, which seriously affects the performance and safety of the combustion chamber.

[0005] In order to overcome the shortcomings of single fuel, mixed fuel combustion chambers have emerged. Among them, the dual-fuel combustion system of liquefied natural gas (LNG) and aviation kerosene is a typical representative. This system uses LNG and aviation kerosene as fuel, which can solve the shortcomings of single fuel in combustion performance, economy or environmental protection to some extent. However, the combustion process of mixed fuel is more complex than that of single fuel, especially in the case of mixing multiple fuels, how to realize uniform mixing and stable combustion of fuel has become a big problem in the design of mixed fuel combustion chambers. SUMMARY

[0006] The present application provides a dual-fuel center-staged multi-flame combustion chamber to solve the problem of unstable combustion of the dual-fuel center-staged multi-flame combustion chamber in the prior art.

[0007] The application provides a dual-fuel center-staged multi-flame combustion chamber, comprising a combustion chamber body, a pre-combustion stage device, a first main combustion stage device and a second main combustion stage device, wherein the pre-combustion stage device, the first main combustion stage device and the second main combustion stage device are respectively arranged at the front end of the combustion chamber body; the pre-combustion stage device comprises a pre-combustion stage assembly and a pre-combustion mixing chamber, the pre-combustion mixing chamber is communicated with the combustion chamber body, the first channel and the second channel are arranged in the pre-combustion stage assembly, the first channel is communicated with the pre-combustion mixing chamber, the first channel, the pre-combustion mixing chamber and the combustion chamber body are coaxially arranged, and the first fuel enters the pre-combustion mixing chamber through the first channel; the pre-combustion mixing chamber is arranged at the outer periphery of the second channel, the second channel is communicated with the pre-combustion mixing chamber, and the second fuel enters the pre-combustion mixing chamber through the second channel; the third channel is arranged in the first main combustion stage device, the fourth channel is arranged in the second main combustion stage device, the fourth channel is communicated with the third channel, and the third channel is communicated with the combustion chamber body; the first fuel enters the combustion chamber body through the third channel, and the second fuel enters the combustion chamber body through the fourth channel and the third channel.

[0008] According to the application, the first main combustion stage device is multiple, and the multiple first main combustion stage devices are arranged at the outer periphery of the pre-combustion stage device.

[0009] According to the application, the pre-combustion stage assembly comprises a first nozzle, a second nozzle, an annular gas collecting chamber, a first swirler and a first venturi, the annular gas collecting chamber is arranged at the front end of the pre-combustion mixing chamber, the first swirler is arranged at the side of the annular gas collecting chamber away from the pre-combustion mixing chamber, and the first swirler and the annular gas collecting chamber form the first channel; the first nozzle is communicated with the inlet of the first channel; the blades of the first swirler form a first tangential inlet, air enters the first channel through the first tangential inlet; the first venturi is arranged between the annular gas collecting chamber and the pre-combustion mixing chamber, the second nozzle is communicated with the inlet of the annular gas collecting chamber, a plurality of flow channels are arranged in the side wall of the first venturi, the inlet of each flow channel is communicated with the outlet of the annular gas collecting chamber, and the outlet of each flow channel is arranged towards the pre-combustion mixing chamber.

[0010] According to the application, the pre-combustion stage assembly comprises a second swirler, the second swirler is arranged between the annular gas collecting chamber and the pre-combustion mixing chamber, the blades of the second swirler form a second tangential inlet, and air enters the pre-combustion mixing chamber through the gap between the inner wall of the second swirler and the outer wall of the first venturi.

[0011] According to the double-fuel center-staged multi-flame combustion chamber provided by the application, the first main combustion stage device comprises a third nozzle and a mixing pipe, the third channel is arranged in the mixing pipe, the third nozzle is communicated with the third channel, and the front end of the mixing pipe is provided with a third tangential inlet.

[0012] According to the double-fuel center-staged multi-flame combustion chamber provided by the application, the first main combustion stage device further comprises a sleeve pipe, the sleeve pipe is arranged in the mixing pipe, the inlet of the sleeve pipe is communicated with the third tangential inlet and the third nozzle respectively, and the outlet of the sleeve pipe is communicated with the outlet of the mixing pipe.

[0013] According to the double-fuel center-staged multi-flame combustion chamber provided by the application, the outer wall of the mixing pipe is further provided with a plurality of first openings, the plurality of first openings are arranged at intervals along the circumference of the mixing pipe, and are located between the outlet of the sleeve pipe and the outlet of the mixing pipe.

[0014] According to the double-fuel center-staged multi-flame combustion chamber provided by the application, the first main combustion stage device further comprises a second venturi pipe, the second venturi pipe is arranged in the mixing pipe, the inlet of the second venturi pipe is communicated with the outlet of the sleeve pipe, and the outlet of the second venturi pipe is communicated with the outlet of the mixing pipe.

[0015] According to the double-fuel center-staged multi-flame combustion chamber provided by the application, the outer wall of the mixing pipe is further provided with a plurality of second openings, the plurality of second openings are arranged at intervals along the circumference of the mixing pipe, and the second openings are arranged close to the outlet of the second venturi pipe.

[0016] According to the double-fuel center-staged multi-flame combustion chamber provided by the application, the second main combustion stage device comprises a fourth nozzle and a gas collecting box, the gas collecting box is arranged between the pre-combustion mixing chamber and the combustion chamber body, the fourth nozzle is communicated with the inlet of the gas collecting box, and the outlet of the gas collecting box is communicated with the third channel.

[0017] The double-fuel center-staged multi-flame combustion chamber provided by the application has the following advantages: the first channel and the second channel are arranged in the pre-combustion stage device, the first fuel can enter the pre-combustion mixing chamber through the first channel, the second fuel can enter the pre-combustion mixing chamber through the second channel, and then enter the center of the combustion chamber body; the first main combustion stage device is arranged to input the first fuel to the circumference of the combustion chamber body; the second main combustion stage device is arranged to input the second fuel to the circumference of the combustion chamber body, so that the first fuel or the second fuel is uniformly distributed in the combustion chamber. In the actual combustion process, different fuels can be switched according to the needs for combustion, the combustion is stable, and the emission level in the combustion chamber is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to make the technical solutions in the present application or prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those ordinary skilled in the art without creative effort based on these drawings.

[0019] Figure 1 is a structural schematic view of a dual-fuel center-staged multi-flame combustion chamber provided by the present application;

[0020] Figure 2 is a front view of the dual-fuel center-staged multi-flame combustion chamber provided by the present application;

[0021] Figure 3 is a sectional view of the dual-fuel center-staged multi-flame combustion chamber provided by the present application;

[0022] Figure 4 is a structural schematic view of a pre-combustion stage device provided by the present application;

[0023] Figure 5 is a sectional view of a first main combustion stage device provided by the present application;

[0024] Figure 6 is an end surface schematic view of a first venturi provided by the present application;

[0025] Reference signs:

[0026] 100, combustion chamber body;

[0027] 200, pre-combustion stage device; 210, pre-combustion stage assembly; 211, first nozzle; 212, second nozzle; 213, annular plenum; 214, first swirler; 2141, first tangential inlet; 215, second swirler; 2151, second tangential inlet; 216, first venturi; 2161, flow passage; 21611, outlet of flow passage; 220, pre-combustion mixing chamber; 230, first passage; 240, second passage;

[0028] 300, first main combustion stage device; 310, third nozzle; 320, mixing tube; 321, third tangential inlet; 322, first opening; 323, second opening; 324, through hole; 330, sleeve; 340, second venturi; 350, third passage;

[0029] 400, second main combustion stage device; 410, fourth nozzle; 420, plenum chamber; 430, fourth passage. DETAILED DESCRIPTION

[0030] In order to make the objects, technical solutions and advantages of the present application clearer, the following will clearly and completely describe the technical solutions in the present application with reference to the drawings in the present application. Obviously, the described embodiments are only a part of embodiments of the present application, and not all embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0031] In the description of the embodiments of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood in a broad sense, for example, can be fixedly connected, can also be detachably connected, or integrally connected, can be mechanically connected, can also be electrically connected, can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0032] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0033] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0034] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation on the present application.

[0035] The following disclosure provides many different embodiments, or examples, for implementing different structures of the present application. For purposes of simplicity of the present disclosure, the description that follows uses specific examples and / or

[0036] The following description is provided in relation to the drawings. Figures 1-6 A dual fuel center staged multi-flame combustor is described.

[0037] The dual fuel center staged multi-flame combustor provided by embodiments of the present application includes a combustor body 100, a pre-combustion stage device 200, a first main combustion stage device 300, and a second main combustion stage device 400. The pre-combustion stage device 200, the first main combustion stage device 300, and the second main combustion stage device 400 are disposed at a front end of the combustor body 100. Fuel is combusted within the combustor body 100 after passing through at least one of the pre-combustion stage device 200, the first main combustion stage device 300, and the second main combustion stage device 400.

[0038] The pre-combustion stage device 200 includes a pre-combustion stage assembly 210 and a pre-combustion mixing chamber 220. The pre-combustion mixing chamber 220 is in communication with the combustor body 100. The pre-combustion stage assembly 210 includes a first passage 230 and a second passage 240. The first passage 230 is in communication with the pre-combustion mixing chamber 220. The first passage 230, the pre-combustion mixing chamber 220, and the combustor body 100 are coaxially arranged. A first fuel is mixed with air within the first passage 230 and then enters the pre-combustion mixing chamber 220. The mixture then enters the center of the combustor body 100 for combustion. The first fuel includes kerosene. The pre-combustion mixing chamber 220 is disposed at an outer periphery of the second passage 240. The second passage 240 is in communication with the pre-combustion mixing chamber 220. A second fuel enters the pre-combustion mixing chamber 220 through the second passage 240 and is mixed with air within the pre-combustion mixing chamber 220. The mixture then enters the combustor body 100 for combustion. The second fuel includes hydrogen. It is understood that air inlets are provided on the first passage 230 and the second passage 240 to allow air to enter the first passage 230 and the second passage 240 for mixing with the fuel. In one embodiment, kerosene enters the pre-combustion mixing chamber 220 through the first passage 230, hydrogen enters the pre-combustion mixing chamber 220 through the second passage 240, and the kerosene and the hydrogen are mixed within the pre-combustion mixing chamber 220. The mixture then enters the combustor body 100 for combustion.

[0039] The first main combustion stage device 300 is provided with a third channel 350, which is communicated with the combustion chamber body 100, and the first fuel (kerosene) enters the combustion chamber body 100 through the third channel 350 for combustion. The second main combustion stage device 400 is provided with a fourth channel 430, which is communicated with the third channel 350, and the second fuel (hydrogen) enters the combustion chamber body 100 through the fourth channel 430 and the third channel 350. In the case of simultaneously inputting the first fuel and the second fuel, the first fuel and the second fuel can be mixed at the outlet of the third channel 350 and then enter the combustion chamber body 100. It can be understood that the third channel 350 is also provided with an air inlet, and the air enters the third channel 350 and is mixed with the fuel.

[0040] The dual-fuel center-staged multi-flame combustion chamber provided by the embodiment of the present application is provided with the first channel 230 and the second channel 240 in the pre-combustion stage device 200, the first fuel can enter the pre-combustion mixing chamber through the first channel 230, and the second fuel can enter the pre-combustion mixing chamber through the second channel 240, and then enter the center of the combustion chamber body 100; the first main combustion stage device 300 is arranged to input the first fuel to the periphery of the combustion chamber body 100; the second main combustion stage device 400 is arranged to input the second fuel to the periphery of the combustion chamber body 100, so that the first fuel or the second fuel is uniformly distributed in the combustion chamber. In the actual combustion process, different fuels can be switched according to the needs for combustion, the combustion is stable, and the emission level in the combustion chamber is reduced.

[0041] The first main combustion stage device 300 in the embodiment of the present application is a plurality of first main combustion stage devices 300, which are arranged around the outer periphery of the pre-combustion stage device 200, so that the fuel is uniformly distributed in the combustion chamber body 100 and is fully combusted, thereby improving the combustion efficiency. Each first main combustion stage device 300 is provided with an independent channel, which can adjust the supply of fuel according to the combustion needs in the combustion chamber, and can realize accurate control and optimal distribution of the fuel under different combustion conditions, thereby achieving high-efficiency and stable combustion effect. The first main combustion stage device 300 can be 3, 5, 7, 8, 10, etc. As shown in Figure 1 and Figure 2 , the first main combustion stage device 300 is 7.

[0042] As shown in Figure 3 and Figure 4As shown, the pre-combustion stage assembly 210 includes a first nozzle 211, a second nozzle 212, an annular plenum 213, a first swirler 214 and a first venturi 216. The annular plenum 213 is arranged at the front end of the pre-combustion chamber 220. The first swirler 214 is arranged at the side of the annular plenum 213 away from the pre-combustion chamber 220, and the first swirler 214 forms a first passage 230 with the inner wall of the annular plenum 213. The first nozzle 211 is in communication with the inlet of the first passage 230, and the first nozzle 211 includes a pressure atomizing nozzle. The first fuel (kerosene) enters the first passage 230 through the first nozzle 211, mixes with air and enters the pre-combustion chamber 220. Specifically, the blades of the first swirler 214 form a first tangential inlet 2141, through which air can enter the interior of the first swirler 214 and mix with the first fuel (kerosene), i.e. enter the first passage 230 and mix with the first fuel (kerosene), and then enter the pre-combustion chamber 220 after mixing. The first tangential inlet 2141 generates a swirl flow in the first swirler 214, which can fully mix with the first fuel (kerosene). The embodiment of the present application optimizes the contact between air and fuel through the design of the first swirler 214, ensures the full atomization and mixing of the fuel, and improves the efficiency of pre-combustion.

[0043] The second nozzle 212 is in communication with the inlet of the annular plenum 213, and the outlet of the annular plenum 213 is in communication with the pre-combustion chamber 220 through the first venturi 216. Specifically, the first venturi 216 is arranged between the annular plenum 213 and the pre-combustion chamber 220, the first venturi 216 accelerates the flow rate of the gas passing through and reduces the pressure, thereby forming a flow rate adjustment effect and further enhancing the mixing efficiency. In addition, the first venturi 216 can further atomize the first fuel (kerosene) to improve the atomization effect. The side wall of the first venturi 216 is provided with a flow channel 2161, the inlet of the flow channel 2161 is in communication with the outlet of the annular plenum 213, and the distal end of the first venturi 216 is provided with a jet port (such as a micropore with a diameter of 0.3 mm), such as Figure 6 As shown, the jet port is the outlet 21611 of the flow channel, the second fuel (hydrogen) enters the annular plenum 213, flows to the distal end of the first venturi 216 through the flow channel on the side wall of the first venturi 216, and is sprayed towards the pre-combustion chamber 220 through the outlet 21611 of the flow channel.

[0044] The side wall of the first venturi 216 is provided with a plurality of flow channels 2161 (the end of the first venturi 216 is provided with a plurality of injection ports, for example, 30 injection ports), the plurality of flow channels 2161 are arranged at intervals along the circumference of the first venturi 216, and the outlets 21611 of the flow channels are located at the outer periphery of the outlet of the first channel 230, so that the second fuel (hydrogen) can be uniformly injected into the pre-combustion mixing chamber 220, further improving the mixing effect, and effectively inhibiting the combustion of the second fuel (hydrogen) from being unstable. The second nozzle 212 comprises a direct injection nozzle.

[0045] Further, the pre-combustion stage assembly 210 further comprises a second swirler 215, which is arranged between the annular plenum 213 and the pre-combustion mixing chamber 220 and is located at the outer periphery of the first venturi 216, the blades of the second swirler 215 are formed with second tangential inlets 2151, through which air can enter the second swirler 215, enter the air flow channel formed between the inner wall of the second swirler 215 and the outer wall of the first venturi 216, and after mixing with the second fuel (hydrogen) injected from the end of the first venturi 216, the mixture enters the pre-combustion mixing chamber 220. In the case that no second fuel is introduced into the second channel 240, the air can be mixed with the first fuel (kerosene) at the outlet of the second channel 240, and after mixing, it enters the pre-combustion mixing chamber 220. The second tangential inlets 2151 generate a swirling flow in the second swirler 215, which can fully mix with the fuel at the outlet of the second channel 240.

[0046] The embodiment of the present application can improve the mixing effect of air and the first fuel (kerosene) by arranging the first swirler 214, and can improve the mixing effect of air and the second fuel (hydrogen) or the first fuel (kerosene) by arranging the second swirler 215, so that the first fuel (kerosene) and the second fuel (hydrogen) can enter the combustion chamber body 100 in a lean state and burn stably. By arranging the first venturi 216, the atomization effect of the first fuel (kerosene) can be improved. In addition, the combustion chamber can switch to the second fuel (hydrogen) when the first fuel (kerosene) is burning. When the second fuel (hydrogen) is burning stably, the first fuel (kerosene) is burned.

[0047] The first main combustion stage device 300 comprises a third nozzle 310 and a mixing pipe 320, a third channel 350 is arranged in the mixing pipe 320, and the third nozzle 310 is communicated with the third channel 350. A front end of the mixing pipe 320 is provided with a third tangential inlet 321, such as a tangential circular hole, a tangential square hole or the like. Air can enter the mixing pipe 320 through the third tangential inlet 321 to generate a rotational flow, that is, enter the third channel 350, and be fully mixed with the first fuel in the third channel 350. The third tangential inlet 321 is a plurality of third tangential inlets 321 which are arranged at intervals along the circumference of the mixing pipe 320, so as to increase the amount of air entering and improve the mixing effect of air and the first fuel (kerosene). The third nozzle 310 is a direct jet nozzle.

[0048] As shown in Figure 3 and Figure 5 , the first main combustion stage device 300 further comprises a sleeve pipe 330 arranged in the mixing pipe 320. The inlet of the sleeve pipe 330 is communicated with the third tangential inlet 321, and air can enter the sleeve pipe 330 through the third tangential inlet 321 to generate a rotational flow. The inlet of the sleeve pipe 330 is also communicated with the third nozzle 310, and the first fuel (kerosene) enters the sleeve pipe through the third nozzle 310. The outlet of the sleeve pipe 330 is communicated with the outlet of the mixing pipe 320. The cross-sectional area of the sleeve pipe 330 gradually decreases along the direction from the inlet of the sleeve pipe 330 to the outlet of the sleeve pipe 330, and the flow rate of the fluid in the sleeve pipe 330 gradually increases. The first fuel (kerosene) enters the sleeve pipe 330 through the third nozzle 310, is mixed with the air entering through the third tangential inlet 321, forms a film on the inner wall of the sleeve pipe 330, and is broken and atomized at the end of the sleeve pipe 330 as the flow rate increases. The atomized first fuel (kerosene) enters the combustion chamber body 100 through the outlet of the mixing pipe 320. The third tangential inlet 321 generates a rotational flow in the sleeve pipe 330, and can be fully mixed with the first fuel (kerosene).

[0049] The outer wall of the mixing pipe 320 is provided with a first opening 322 located between the outlet of the sleeve pipe 330 and the outlet of the mixing pipe 320. Air can enter the mixing pipe 320 through the first opening 322 to mix with the atomized first fuel (kerosene) at the end of the sleeve pipe 330. The first opening 322 is a plurality of first openings 322 arranged at intervals along the circumference of the mixing pipe 320, so as to further improve the mixing effect. The amount of air entering is increased, so that the first fuel (kerosene) in the mixing pipe 320 is injected into the combustion chamber body 100 in a lean state, the temperature of the main combustion zone is reduced, and the emission of NOx is reduced.

[0050] Further, the first main combustion stage device 300 further comprises a second venturi 340 arranged in the mixing pipe 320. The inlet of the second venturi 340 is communicated with the outlet of the sleeve pipe 330, and the outlet of the second venturi 340 is communicated with the outlet of the mixing pipe 320. Figure 5As shown, the first opening 322 is located between the outlet of the sleeve pipe 330 and the inlet of the second venturi 340; the outlet of the second venturi 340 communicates with the outlet of the mixing pipe 320. The first fuel (kerosene) enters into the sleeve pipe 330 through the third nozzle 310, mixes with the air entering through the third tangential inlet 321 to form a film on the inner wall surface of the sleeve pipe 330, and breaks at the end of the sleeve pipe 330 to realize the first atomization as the flow rate increases. The atomized first fuel (kerosene) mixes with the air entering through the first opening 322, and then enters into the second venturi 340 to form a film on the inner wall surface of the second venturi 340 again. As the structure of the second venturi 340 changes, the flow rate also changes, and the first fuel (kerosene) breaks at the end of the second venturi 340 to realize the second atomization. The twice-atomized first fuel (kerosene) enters into the combustion chamber body 100, and the atomization effect is good, which helps to improve the stability of combustion.

[0051] The outer wall of the mixing pipe 320 is further provided with a second opening 323, which is arranged near the outlet of the second venturi 340. The air enters into the air flow channel between the inner wall of the mixing pipe 320 and the outer wall of the second venturi 340 through the second opening 323, flows towards the outlet direction of the mixing pipe 320, and mixes with the first fuel (fuel) at the end of the mixing pipe 320 and the end of the second venturi 340 again. The second opening 323 is a plurality of second openings 323, which are arranged along the circumference of the mixing pipe 320 at intervals, to further improve the mixing effect; the amount of air entering increases, and the first fuel (kerosene) is injected into the combustion chamber body 100 in a lean state, which reduces the temperature of the main combustion zone and reduces the emission of NOx.

[0052] The first opening 322 in the embodiment of the application can be circular, elliptical, polygonal, as shown in Figs. 1 and 2, and the like. Figure 1 and Figure 5 As shown, the first opening 322 is a rectangular opening. The second opening 323 in the embodiment of the application can be circular, elliptical, polygonal, as shown in Figs. 1 and 2, and the like. Figure 1 and Figure 5 As shown, the second opening 323 is a rectangular opening.

[0053] The second main combustion stage device 400 comprises a fourth nozzle 410 and a gas collecting box 420 which is arranged between the precombustion mixing chamber 220 and the combustion chamber body 100. It is to be noted that the gas collecting box 420 is provided with a plurality of avoiding holes, and each first main combustion stage device 300 can pass through the avoiding holes to communicate with the combustion chamber body 100, i.e. each mixing pipe 320 is inserted into the avoiding holes. The fourth nozzle 410 communicates with the inlet of the gas collecting box 420 and sprays the second fuel (hydrogen) into the gas collecting box 420, so as to reduce the flow rate of the second fuel (hydrogen) in the gas collecting box 420. The third channel 350 is provided with a through hole 324, i.e. the outer periphery of the mixing pipe 320 in the avoiding hole is provided with the through hole 324, the outlet of the gas collecting box 420 communicates with the through hole 324, so as to realize the communication between the gas collecting box 420 and the third channel 350. The second fuel (hydrogen) enters the gas collecting box 420 through the fourth nozzle 410, and after the flow rate is reduced in the gas collecting box 420, the second fuel (hydrogen) enters the combustion chamber body 100 through the outlet of the gas collecting box 420, the through hole 324 and the outlet of the third channel 350. The fourth nozzle 410 comprises a direct jet nozzle.

[0054] It is to be noted that the air inlet of the third channel 350 is the air inlet of the fourth channel 430 at this time, i.e. the air enters the third channel 350 through the third tangential inlet 321, the first opening 322 and the second opening 323 on the mixing pipe 320, mixes with the second fuel (hydrogen) at the outlet of the gas collecting box 420, and then enters the combustion chamber body 100 after mixing. The second fuel (hydrogen) is slightly diffused into the combustion chamber body 100, and lean combustion is formed, so as to form a short and small flame. The high molecular diffusion rate and high flame speed of hydrogen can realize better mixing, lower high-temperature gas residence time and combustion temperature, and greatly reduce the generation amount of NOx. When the first fuel (kerosene) is used for combustion in the combustion chamber, the fourth nozzle 410 inputs air into the gas collecting box 420 at this time, which can mix with the first fuel (kerosene) in the third channel 350 on the one hand, and can prevent the first fuel (kerosene) in the third channel 350 from entering the gas collecting box 420 through the outlet of the gas collecting box 420 on the other hand.

[0055] The first nozzle 211, the second nozzle 212, the third nozzle 310 and the fourth nozzle 410 of the embodiment of the present application can make the distribution of the first fuel (kerosene) and the second fuel (hydrogen) in space more uniform, avoid local rich oil or rich hydrogen, and reduce the generation of soot. In addition, the temperature distribution in the combustion chamber body 100 can be adjusted to improve uniformity.

[0056] In a specific embodiment, the structure of the combustion chamber body 100 is as shown in Figure 1 and Figure 2As shown, the length is 135mm, the height is 90mm, the length of the top arc segment is 388.4014mm, and the length of the bottom arc segment is 208.3932mm. The diameter of the third nozzle 310 in the first main combustion stage device 300 is 0.945mm, and the length of the third nozzle 310 extending into the mixing tube 320 is 8.2mm. The third tangential inlet 321 of the mixing tube 320 is a circular hole with a diameter of 2mm, and there are 12 third tangential inlets 321. The first opening 322 is a rectangular opening with a length of 4.5mm and a width of 1mm, and there are 24 first openings 322. The second opening 323 is also a rectangular opening with a length of 6mm and a width of 1mm, and there are 24 second openings 323. The end of each mixing tube 320 is provided with 10 through holes 324 with a diameter of 1mm for the second fuel (hydrogen) to be sprayed out. The diameter of the fourth nozzle 410 in the second main combustion stage device 400 is 4.5mm. The diameter of the first nozzle 211 in the precombustion stage device 200 is 0.3mm, and the diameter of the second nozzle 212 is 2.5mm.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent replacements to some technical features therein. Such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A dual fuel, centrally staged, multi-flame combustion chamber characterized by, The combustion chamber comprises a combustion chamber body, a pre-combustion stage device, a first main combustion stage device and a second main combustion stage device, the pre-combustion stage device, the first main combustion stage device and the second main combustion stage device are respectively arranged at the front end of the combustion chamber body; The pre-combustion stage device comprises a pre-combustion stage assembly and a pre-combustion mixing chamber, the pre-combustion mixing chamber is in communication with the combustion chamber body, the pre-combustion stage assembly is provided with a first channel and a second channel, the first channel is in communication with the pre-combustion mixing chamber, the first channel, the pre-combustion mixing chamber and the combustion chamber body are coaxially arranged, and the first fuel enters the pre-combustion mixing chamber through the first channel; the pre-combustion mixing chamber is arranged at the outer periphery of the second channel, the second channel is in communication with the pre-combustion mixing chamber, and the second fuel enters the pre-combustion mixing chamber through the second channel; The first main combustion stage device is provided with a third channel, the second main combustion stage device is provided with a fourth channel, the fourth channel is in communication with the third channel, and the third channel is in communication with the combustion chamber body; the first fuel enters the combustion chamber body through the third channel, and the second fuel enters the combustion chamber body through the fourth channel and the third channel; The first main combustion stage device comprises a mixing pipe, the third channel is arranged in the mixing pipe, at least one through hole for the second fuel to enter is arranged on the outer peripheral wall of the mixing pipe, the fourth channel is in communication with the through hole, so that the second fuel is injected into the third channel, and after being mixed with the first fuel and air, the second fuel enters the combustion chamber body. The first main combustion stage device is a plurality of, and a plurality of first main combustion stage devices are arranged at the outer periphery of the pre-combustion stage device.

2. The dual-fuel, center staged, multi-flame combustion chamber of claim 1, wherein, The pre-combustion stage assembly comprises a first nozzle, a second nozzle, an annular gas collecting chamber, a first cyclone and a first venturi, the annular gas collecting chamber is arranged at the front end of the pre-combustion mixing chamber, the first cyclone is arranged on the side of the annular gas collecting chamber away from the pre-combustion mixing chamber, and the first cyclone and the annular gas collecting chamber form the first channel; the first nozzle is in communication with the inlet of the first channel; the blades of the first cyclone form a first tangential inlet, and air enters the first channel through the first tangential inlet; 3. The dual-fuel, center staged, multi-flame combustion chamber of claim 1, wherein, The first venturi is arranged between the annular gas collecting chamber and the pre-combustion mixing chamber, the second nozzle is in communication with the inlet of the annular gas collecting chamber, a plurality of flow channels are arranged in the side wall of the first venturi, the inlet of each flow channel is in communication with the outlet of the annular gas collecting chamber, and the outlet of each flow channel is arranged towards the pre-combustion mixing chamber. The pre-combustion stage assembly comprises a second cyclone, the second cyclone is arranged between the annular gas collecting chamber and the pre-combustion mixing chamber, the blades of the second cyclone form a second tangential inlet, and air enters the pre-combustion mixing chamber through the gap between the inner wall of the second cyclone and the outer wall of the first venturi.

4. The dual-fuel, center staged, multi-flame combustion chamber of claim 3, wherein, The first main combustion stage device comprises a third nozzle, the third nozzle is in communication with the third channel, and the front end of the mixing pipe is provided with a third tangential inlet.

5. The dual-fuel, center staged, multi-flame combustion chamber of claim 1, wherein, ​ 6. The dual-fuel, centrally staged, multi-flame combustion chamber of claim 5, wherein, The first primary combustion stage device further comprises a sleeve pipe arranged in the mixing pipe, an inlet of the sleeve pipe being communicated with the third tangential inlet and the third nozzle respectively, and an outlet of the sleeve pipe being communicated with the outlet of the mixing pipe; a cross-sectional area of the sleeve pipe gradually decreases along a direction from the inlet of the sleeve pipe to the outlet of the sleeve pipe.

7. The dual-fuel, centrally staged, multi-flame combustion chamber of claim 6, wherein, The outer wall of the mixing pipe is further provided with a plurality of first openings, the plurality of first openings being arranged along a circumferential direction of the mixing pipe and located between the outlet of the sleeve pipe and the outlet of the mixing pipe.

8. The dual-fuel, center staged, multi-flame combustion chamber of claim 6, wherein, The first primary combustion stage device further comprises a second venturi pipe arranged in the mixing pipe, an inlet of the second venturi pipe being communicated with the outlet of the sleeve pipe, and an outlet of the second venturi pipe being communicated with the outlet of the mixing pipe.

9. The dual-fuel, centrally staged, multi-flame combustion chamber of claim 8, wherein, The outer wall of the mixing pipe is further provided with a plurality of second openings, the plurality of second openings being arranged along a circumferential direction of the mixing pipe and located close to the outlet of the second venturi pipe.

10. The dual-fuel, centrally staged, multi-flame combustion chamber of claim 1, wherein, The second primary combustion stage device comprises a fourth nozzle and a gas collecting box, the gas collecting box being arranged between the pre-combustion mixing chamber and the combustion chamber body, the fourth nozzle being communicated with an inlet of the gas collecting box, and an outlet of the gas collecting box being communicated with the third channel.

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