Dual-fuel combustion nozzle for liquid hydrocarbon fuel and hydrogen fuel

Abstract

The invention provides a dual-fuel combustion nozzle which comprises a nozzle shell connected with a cooling plate. A hydrogen fuel gas collecting cavity and a liquid hydrocarbon fuel pipe which are coaxial are arranged in the nozzle shell; a first air channel is formed between the inner wall of the hydrogen fuel gas collecting cavity and the liquid hydrocarbon fuel pipe, and a swirler is arranged in the first air channel; a second air channel is formed between the outer wall of the hydrogen fuel gas collecting cavity and the inner shell of the nozzle shell; a liquid hydrocarbon spray hole is formed in the outlet end of the liquid hydrocarbon fuel pipe and is positioned in a space formed by the expansion section of the venturi structure; a hydrogen spray hole is formed in the side wall, close to the top end, of the hydrogen fuel collecting cavity. The invention further provides an engine combustion chamber comprising the combustion nozzle. According to the invention, efficient mixing of hydrocarbon fuel and hydrogen fuel can be realized, the phenomenon of backfire spontaneous combustion is avoided, the flameout boundary is widened, and stable switching of multiple working modes is realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of aeroengines, and in particular relates to a dual-fuel combustion nozzle for liquid hydrocarbon fuel and hydrogen fuel. The present invention also relates to a combustion chamber using the dual-fuel combustion nozzle. Background Art

[0002] The combustion chamber is one of the three major parts of the core machine of an aircraft engine. It is the core part of the aircraft engine. The important performance indicators of the combustion chamber mainly include ignition boundary, flameout boundary, outlet temperature distribution and total pressure loss. The combustion chamber converts the chemical energy of the fuel into the total enthalpy of the fuel gas through the reasonable organization of combustion and flow, which is of great significance to the performance of the whole machine.

[0003] The spray device composed of a fuel nozzle and a multi-stage swirler is usually called a swirl cup. The swirler is an indispensable combustion chamber component for promoting the mixing of aircraft engine gas and stabilizing the flame. In the design of aircraft engines, it is necessary to reduce the smoke in the combustion chamber and increase its stable working range. The number of swirler stages has also developed from single stage to double stage, and even to three stages. The swirl cup is an important component of the combustion chamber of an aircraft engine. It has excellent performance and determines the combustion performance of the combustion chamber to a certain extent. At present, the combustion chamber of aircraft engines widely adopts a swirl cup structure that uses liquid hydrocarbon fuels such as aviation kerosene as fuel. The liquid mist combustion of the swirl cup combustion chamber using traditional hydrocarbon fuels limits the high temperature rise and wide flammable boundary required by the current combustion chamber, which limits the combustion performance.

[0004] Hydrogen has attracted attention due to its unique physical and chemical properties compared to traditional hydrocarbon fuels. Taking natural gas as a comparison object, the lean combustion equivalent ratio limit of hydrogen is 0.1, which is lower than the lean combustion limit of natural gas of 0.4, which can achieve wide-range stable combustion and broaden the operating condition boundary of lean combustion. However, hydrogen premixed combustion is very prone to flashback, and the higher laminar flame speed of hydrogen also makes flashback more likely to occur; flashback can lead to unstable combustion, equipment damage, and even explosion.

[0005] Therefore, a new combustion nozzle structure is urgently needed to solve the above-mentioned defects. Summary of the invention

[0006] The present invention provides a dual-fuel combustion nozzle, in which air, hydrocarbon fuel and hydrogen fuel inlets are independent and the air, hydrocarbon fuel and hydrogen fuel are mixed in different areas, thereby solving the defects in the prior art that liquid mist combustion in a swirl cup combustion chamber using traditional hydrocarbon fuels will limit the high temperature rise and wide flammable boundary required by the combustion chamber, and that flashback is easily generated when using hydrogen fuel.

[0007] The present invention also provides a combustion chamber containing the above-mentioned dual-fuel combustion nozzle, wherein the air, hydrocarbon fuel and hydrogen fuel inlets are independent of each other, and the dual-fuel combustion chamber can improve the combustion performance of the aircraft engine through the selection of two fuels with different combustion characteristics and matching combustion organization modes, broaden the working boundaries and adjustment ranges in various working environments and working conditions, and ensure sufficient safety margins. The dual-fuel combustion chamber can alleviate the deficiencies of a single fuel in terms of safety boundaries and performance limits by switching between two fuels or working together, and can achieve stronger environmental adaptability.

[0008] According to one aspect of the present invention, there is provided a dual fuel combustion nozzle, comprising: a nozzle housing, wherein the nozzle housing is connected to a cooling plate; The nozzle housing is provided with a coaxial hydrogen fuel collecting cavity and a liquid hydrocarbon fuel pipe; A first air channel is formed between the inner wall of the hydrogen fuel collecting cavity and the liquid hydrocarbon fuel pipe, and a swirler is provided in the first air channel; A second air passage is formed between the outer wall of the hydrogen fuel collecting chamber and the inner shell of the nozzle housing; The first air passage has a venturi structure formed by the inner wall of the hydrogen fuel collecting chamber on one side close to the outlet thereof, and the venturi structure includes an expansion section and a contraction section; The outlet end of the liquid hydrocarbon fuel pipe is provided with a liquid hydrocarbon spray hole, and the liquid hydrocarbon spray hole is located in the space formed by the expansion section of the venturi structure; A hydrogen spray hole is arranged on the side wall of the hydrogen fuel collecting chamber near the top thereof, and the hydrogen spray hole is located near the outlet end surface.

[0009] The hydrogen spray holes are configured to spray hydrogen horizontally and directly or upwardly and obliquely.

[0010] Wherein, the hydrogen spray holes are distributed at circumferential intervals on the contraction section.

[0011] The hydrogen spray holes are distributed at intervals in the circumferential direction on the outlet section of the outer wall of the hydrogen fuel collecting chamber, and the hydrogen spray holes are constructed to spray hydrogen obliquely upward.

[0012] Wherein, the aperture of the hydrogen spray hole is 0.5-1.5 times the aperture of the liquid hydrocarbon spray hole.

[0013] Wherein, the number of the hydrogen spray holes is 10-16.

[0014] Wherein, the cooling plate is in a circular ring shape, and its plate surface is flush with the top of the hydrogen fuel collecting cavity; and cooling through holes are provided on the cooling plate.

[0015] Wherein, the cooling through holes are inclined holes arranged circumferentially.

[0016] The cooling through hole extends along the circumference of the cooling plate, and the center line thereof is 30-60° with the center axis of the cooling plate.

[0017] Wherein, the aperture of the cooling through hole is 0.2-1.0 times the aperture of the liquid hydrocarbon spray hole.

[0018] Wherein, a swirler is provided in the second air passage, for example, at the air inlet end of the second air passage.

[0019] Wherein, when the flow rate is 0.3-0.5, the aperture of the liquid hydrocarbon spray hole is 2-4 mm.

[0020] According to one aspect of the present invention, an engine combustion chamber is provided, comprising the aforementioned dual-fuel combustion nozzle.

[0021] According to the present invention, the zoned blending design of air, liquid hydrocarbon fuel, and hydrogen fuel realizes efficient matching of the traditional kerosene swirl cup structure and the hydrogen micro-tube structure, and can achieve efficient blending of oil and gas in a variety of modes where the two fuels work independently or together, thereby broadening the flameout boundary and creating favorable conditions for combustion in the flame tube.

[0022] According to the present invention, reasonable micro-mixed combustion organization is used to avoid the flashback and spontaneous combustion of hydrogen combustion, and stable switching of multiple working modes is achieved.

[0023] According to the present invention, a dual-fuel combustion mode of liquid hydrocarbon fuel and hydrogen fuel is adopted, and the advantage of wide-range stability of dual-fuel combustion is utilized, so that the combustion chamber can stably burn in a wide operating environment and complex intake conditions.

[0024] According to the present invention, through the coupling design of the multi-oblique hole cooling plate and the swirler, high combustion efficiency is achieved in a wide range and nitrogen oxide (NOx) emissions of the combustion chamber are reduced, thereby broadening the combustible boundary of the combustion chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] Figure 1 It is a cross-sectional view of an embodiment of a combustion nozzle provided by the present invention.

[0027] Figure 2It is a schematic diagram of the injection of dual fuels in the combustion nozzle provided by the present invention.

[0028] Figure 3 It is a schematic diagram of a method of injecting hydrogen fuel in a combustion nozzle provided by the present invention.

[0029] Figure 4 It is a schematic diagram of another injection method of hydrogen fuel in the combustion nozzle provided by the present invention.

[0030] Figure 5 yes Figure 4 Arrangement diagram of hydrogen nozzles corresponding to the injection method.

[0031] Figure 6 It is a top view of an embodiment of the combustion nozzle provided by the present invention.

[0032] Figure 7 It is an oblique view of an embodiment of the combustion nozzle provided by the invention.

[0033] Figure 8 It is a front view of an embodiment of a combustion chamber provided by the present invention.

[0034] Fig. 9 yes Figure 8 Cross-sectional view at AA.

[0035] Reference numerals: 100: air inlet pipe; 200: air cavity; 300: combustion area; 400: dual fuel nozzle; 1: nozzle housing; 111: inner shell; 112: outer shell; 2: first air channel; 3: second air channel; 4: hydrogen inlet pipe; 5: liquid hydrocarbon inlet pipe; 6: cooling plate; 7: hydrogen fuel collecting chamber; 711: outlet section; 712: tapered section; 713: top; 8: venturi structure; 811: expansion section; 812: contraction section; 9: swirler; 10: liquid hydrocarbon spray hole; 11: hydrogen spray hole; 12: cooling through hole. DETAILED DESCRIPTION

[0036] 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.

[0037] Combine the following Figure 1-Figure 9 The present invention is described.

[0038] like Figure 1As shown, a dual-fuel combustion nozzle 400 comprises: a nozzle housing 1, the nozzle housing 1 being connected to a cooling plate 6; a hydrogen fuel collecting chamber 7 and a liquid hydrocarbon fuel pipe 5 coaxial therewith are arranged inside the nozzle housing 1; a first air channel 2 is formed between the inner wall of the hydrogen fuel collecting chamber 7 and the liquid hydrocarbon fuel pipe 5, and a swirler 9 is arranged in the first air channel 2; a second air channel 3 is formed between the outer wall of the hydrogen fuel collecting chamber 7 and the inner shell 111 of the nozzle housing 1; a venturi structure 8 formed by the inner wall of the hydrogen fuel collecting chamber 7 is provided on the side of the first air channel 2 close to its outlet, and the venturi structure 8 comprises an expansion section 811 and a contraction section 812; a liquid hydrocarbon spray hole 10 is provided at the outlet end of the liquid hydrocarbon fuel pipe 5, and the liquid hydrocarbon spray hole 10 is located in the expansion section 811 of the venturi structure 8; a hydrogen spray hole 11 is provided on the side wall of the hydrogen fuel collecting chamber 7 close to its top 713.

[0039] According to the present invention, the nozzle housing 1 is coaxially arranged with the hydrogen fuel collecting chamber 7 and the liquid hydrocarbon fuel pipe 5; the air entering the first air channel 2 is ejected after passing through the swirler 9; the liquid hydrocarbon enters the liquid hydrocarbon spray hole 10 through the liquid hydrocarbon fuel pipe 5 and is ejected, whereupon it is broken into small droplets; it is mixed with the air ejected through the swirler 9 to form a hydrocarbon fuel mixture; the hydrocarbon fuel mixture is beneficially improved by passing through the venturi structure 8. The position of the hydrogen spray hole 11 is much higher than the liquid hydrocarbon spray hole 10; the hydrocarbon fuel mixture is then mixed with the hydrogen fuel ejected from the hydrogen spray hole 11. In this way, the fuel can be mixed in different zones. The cooling plate helps to reduce the temperature of the combustion nozzle, prevent overheating, and ensure combustion efficiency and service life.

[0040] The combustion nozzle according to the present invention adopts a dual-fuel combustion form of liquid hydrocarbon fuel and hydrogen fuel, and can adopt a working combustion mode in which the two fuels work independently or together, and the dual fuel and air partitions are independent, ensuring full combustion of the fuel and avoiding backfire in a wide range of working conditions.

[0041] The hydrogen fuel collecting chamber 7 is supplied with gas by the hydrogen inlet pipe 4. The cyclone 9 in the first air channel 2 is connected to the liquid hydrocarbon inlet pipe 5 and the inner wall of the hydrogen fuel collecting chamber 7, respectively. The position on the inner wall of the hydrogen fuel collecting chamber 7 corresponding to the gas outlet port is the starting point of the expansion section 811, and its inner diameter is 11-13mm and the outer diameter is 18-22mm. The length and swirl number can be selected by technicians in this field according to needs.

[0042] The venturi tube structure 8 includes a throat, the diameter of the throat is 3.5-4.5 mm, the ratio of the length of the expansion section 811 to the throat diameter is 0.7-1.1, such as 0.8-0.9, the ratio of the length of the contraction section 812 to the throat diameter is 0.5-0.9, such as 0.65-0.75, and the diameter of the outlet of the contraction section 812, i.e., the end of the inner wall of the hydrogen fuel collecting cavity 7, is 10-15 mm, such as 11-13 mm, 12.5-13.5 mm. The venturi tube structure 8 is conducive to the full mixing of fuel and air, and is conducive to increasing the gas pressure and improving the combustion efficiency.

[0043] The hydrogen spray hole 11 is configured to spray hydrogen horizontally or obliquely upward, that is, the hydrogen fuel sprayed from the hydrogen spray hole 11 is sprayed horizontally or obliquely upward. It can be understood by those skilled in the art that the top or top in this article refers to the discharge end of the combustion nozzle, not the feed end. By further adjusting the opening direction of the hydrogen spray hole 11, the spray direction of the hydrogen fuel can be adjusted, and the mixing form of the hydrogen fuel with air or with the hydrocarbon fuel mixture can be adjusted, thereby improving the combustion effect of the combustion area.

[0044] The flow number (FN) is used to characterize the effective flow area of ​​the liquid hydrocarbon spray hole, which is the ratio of the liquid hydrocarbon fuel flow rate to the square root of the injection pressure difference. When the flow number is 0.3-0.5, the aperture of the liquid hydrocarbon spray hole is 2-4 mm.

[0045] The number and aperture of the hydrogen spray holes 11 are determined according to the flow rate and pressure drop of hydrogen. The velocity is obtained according to the pressure drop, and then the total area of ​​the holes can be obtained according to the required flow rate. Under the condition that the aperture is already limited, the number of hydrogen spray holes 11 can be obtained. The calculation method is known to those skilled in the art and will not be repeated here. In a specific embodiment, the aperture of the hydrogen spray hole 11 is 0.5-1.5 times the aperture of the liquid hydrocarbon spray hole 10. In a specific embodiment, the number of the hydrogen spray holes 11 is 10-16.

[0046] By setting the hydrogen nozzles, hydrogen is ejected through a large number of small-aperture nozzles, achieving subsequent hydrogen micro-mixing combustion; hydrogen has the characteristic of a small quenching distance, and the smaller spatial scale of the hydrogen nozzles and the larger mass diffusion coefficient of hydrogen make the premixing effect better. Furthermore, by reducing the hydrogen outlet area and increasing the jet velocity, the flashback problem can be alleviated.

[0047] The second air channel 3 is also provided with a swirler 9, which is connected to the inner wall 111 of the nozzle housing 1 and the outer wall of the hydrogen fuel collecting chamber 7, respectively, and is located at the air inlet end of the second air channel 3; the combustion nozzle is designed as a double swirl cup, and the gas flowing out of the second air channel 3 is the outer swirl air. The outer diameter of the swirler 9 in the second air channel 3 is 34-38mm, and the inner diameter is 30-35mm; its length and swirl number can be selected by those skilled in the art as needed. The outlet port of the swirler 9 in the second air channel 3 is flush with the outlet port of the first air channel 2.

[0048] The second air passage 3 is an annular chamber; the inner ring is the outer wall of the hydrogen fuel collecting cavity 7; and the outer ring is the inner shell of the nozzle housing 1. On the side close to the discharge end of the dual-fuel combustion nozzle, the outer wall of the hydrogen fuel collecting cavity 7 first gradually decreases in diameter to form a tapered section 712; then remains unchanged as an outlet section 711, and the end of the outer wall merges with the end of the inner wall to form an annular top 713. The width of the top 713 of the hydrogen fuel collecting cavity 7 in the radial direction of the combustion nozzle is 1.5-3 mm, such as 2-2.5 mm.

[0049] The starting point of the tapered section 712 is flush with the starting point of the expansion section 811 of the inner wall. The diameter of the inner shell 111 of the nozzle housing 1 also gradually decreases near the discharge end of the dual-fuel combustion nozzle. At the outlet of the second air channel 3, the spacing between the inner ring and the outer ring is 1-2 mm, such as 1.5-2 mm, 1.3-1.8 mm.

[0050] like Figure 2 and 3 As shown, the hydrogen injection holes 11 are located in the contraction section 812 of the venturi structure 8, that is, located on the upper inner wall of the hydrogen fuel collecting chamber 7, and are distributed at intervals in the circumferential direction so that the hydrogen fuel (or hydrogen fuel) is injected inwardly. Figure 2 In the figure, the injection flow direction of the liquid hydrocarbon fuel sprayed from the liquid hydrocarbon spray hole 10 is indicated by the arrow, and the opening of the hydrogen spray hole 11 is obliquely upward, so that the hydrogen fuel is sprayed obliquely upward. Figure 3 The opening of the hydrogen injection hole 11 is horizontal, and its axis is in the radial direction of the combustion nozzle 400, and the hydrogen fuel is injected horizontally. The hydrogen fuel injected inward is preliminarily premixed with the hydrocarbon fuel mixture; and then mixed with the outer swirl air, so as to further ensure uniform mixing, thereby optimizing combustion performance and improving combustion stability.

[0051] The opening position of the hydrogen injection hole 11 in the contraction section 812 is not specifically limited. Figure 2 In the embodiment, the hole margin from the hydrogen injection hole 11 to the top 713 of the hydrogen fuel collecting cavity 7 is 0.25-0.35 mm, such as 0.3-0.35 mm. Figure 3As shown in , the hole margin from the hydrogen injection hole 11 to the top end 713 of the hydrogen fuel collecting cavity 7 is 1-2 mm, such as 1.5-2 mm.

[0052] Such as 4 and Figure 5 As shown, the hydrogen injection holes 11 are distributed at intervals in the circumferential direction on the outer wall of the hydrogen fuel collecting chamber 7, such as the outlet section 711. The position of the hydrogen injection holes 11 on the outlet section 711 is not specifically limited. In a specific embodiment, Figure 4 and 5 As shown, the hole margin from the hydrogen injection hole 11 to the top end 713 of the hydrogen fuel collecting cavity 7 is 1.5-2.5 mm, such as 2-2.5 mm.

[0053] In a specific embodiment, the hydrogen spray hole (11) is configured to spray hydrogen obliquely upward; the hydrogen fuel is sprayed obliquely outward from the top of the outer wall of the hydrogen fuel collecting chamber 7. At this time, the sprayed hydrogen fuel is first mixed with the outer layer of air, and then mixed with the outflowing hydrocarbon fuel mixture, so that the dual fuel is mixed in different areas and mixed evenly. When a swirler 9 is provided in the second air channel 3, an outer layer of swirling air is formed. At this time, the sprayed hydrogen fuel is first mixed with the outer layer of swirling air, and then mixed with the outflowing hydrocarbon fuel mixture, so as to achieve a better mixing effect, optimize the combustion performance and improve the combustion stability.

[0054] like Figure 6 and Figure 7 As shown, the cooling plate 6 is in a circular shape, and its inner and outer circumferences are respectively connected to the inner wall 111 and the outer wall 112 of the nozzle housing 1. The plate surface of the cooling plate 6 is flush with the top 713 of the hydrogen fuel collecting cavity 7; a cooling through hole 12 is provided on the cooling plate 6. The outer diameter of the cooling plate is 45-60mm, such as 50-60mm, 55-60mm. Among them, the aperture of the cooling through hole 12 is 0.2-1.0 times the aperture of the liquid hydrocarbon spray hole. The setting of the cooling through hole 12 can be mixed with the mixed dual fuel and swirl air to improve the subsequent combustion efficiency, reduce the NOx emission of the combustion chamber, and widen the combustible boundary.

[0055] like Figure 6 As shown, the liquid hydrocarbon spray hole 10 is located at the center of the dual fuel combustion nozzle 400, the hydrogen spray holes 11 are circumferentially spaced on the inner wall of the hydrogen fuel collecting cavity 7; and the cooling through holes 12 are circumferentially arranged in multiple circles on the cooling plate 6. Figure 7As shown, the cooling through hole 12 is an inclined hole, and the cooling through hole 12 is an inclined hole arranged circumferentially in multiple circles. The number of circles can be 1 to 5 circles. Among them, the cooling through hole 12 extends along the circumference of the cooling plate 6 and penetrates the cooling plate 6; the center line of the cooling through hole 12 is 30-60° with the central axis of the cooling plate 6, that is, the central axis of the dual-fuel combustion nozzle. Such a design can also generate corresponding swirl air, which can be further coupled and mixed with the mixed dual fuel and swirl air, thereby further improving the subsequent combustion efficiency, further reducing the NOx emissions of the combustion chamber, and further widening the combustible boundary.

[0056] According to another aspect of the present invention, there is also provided an engine combustion chamber, comprising the aforementioned dual-fuel combustion nozzle. Figure 8 and 9 As shown, the combustion chamber includes an air inlet pipe 100 , an air cavity 200 , and a combustion area 300 , and a dual-fuel nozzle 400 is installed on the bottom plate of the combustion area 300 .

[0057] The air cavity 200 is in communication with the first air channel 2 and the second air channel 3 of the dual-fuel combustion nozzle and the through hole of the cooling plate 6, and provides air intake for the first air channel 2 and the second air channel 3 and the cooling plate 6. The dual-fuel nozzle discharges the mixed hydrocarbon fuel, hydrogen fuel and air into the combustion area (300) for combustion.

[0058] Hydrogen fuel is fed through hydrogen inlet pipe 4, liquid hydrocarbon fuel is fed through liquid hydrocarbon inlet pipe 5, and air is fed through air inlet pipe 100, so that the inlet of air, hydrocarbon fuel and hydrogen fuel are independent of each other, which is convenient for switching or working together of the two fuels.

[0059] The device embodiments described above are merely illustrative. Some or all of the components may be selected according to actual needs to achieve the purpose of the present embodiment. Those skilled in the art may understand and implement the present invention without creative effort.

[0060] 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 dual fuel combustion nozzle, characterized in that: The dual fuel combustion nozzle comprises: A nozzle housing (1), the nozzle housing being connected to a cooling plate (6); The nozzle housing (1) is provided with a coaxial hydrogen fuel collecting cavity (7) and a liquid hydrocarbon fuel pipe (5) therein; A first air channel (2) is formed between the inner wall of the hydrogen fuel collecting cavity (7) and the liquid hydrocarbon fuel pipe (5), and a swirler is provided in the first air channel (2); A second air channel (3) is formed between the outer wall of the hydrogen fuel collecting cavity (7) and the inner shell (111) of the nozzle housing (1); The first air channel (2) has a venturi structure (8) formed by the inner wall of the hydrogen fuel collecting chamber (7) on one side close to the outlet thereof, and the venturi structure (8) comprises an expansion section (811) and a contraction section (812); The outlet end of the liquid hydrocarbon fuel pipe (5) is provided with a liquid hydrocarbon spray hole (10), and the liquid hydrocarbon spray hole (10) is located in the space formed by the expansion section (811) of the venturi structure (8); The hydrogen fuel gas collecting chamber (7) is provided with a hydrogen spray hole (11) on a side wall close to the top end (713) thereof.

2. The dual fuel combustion nozzle according to claim 1, characterized in that: The hydrogen spray hole (11) is configured to spray hydrogen horizontally and straightly or obliquely upward.

3. The dual fuel combustion nozzle according to claim 1 or 2, characterized in that: The hydrogen injection holes (11) are distributed at circumferential intervals on the contraction section (812).

4. The dual fuel combustion nozzle according to claim 1 or 2, characterized in that: The hydrogen spray holes (11) are distributed at intervals in the circumferential direction on the outlet section (711) of the outer wall of the hydrogen fuel collecting chamber (7), and the hydrogen spray holes (11) are constructed to spray hydrogen obliquely upward.

5. The dual fuel combustion nozzle according to claim 1 or 2, characterized in that: The diameter of the hydrogen spray hole (11) is 0.5-1.5 times the diameter of the liquid hydrocarbon spray hole (10); and / or the number of the hydrogen spray holes is 10-16.

6. The dual fuel combustion nozzle according to claim 1, characterized in that: The cooling plate (6) is annular in shape, and its plate surface is flush with the top end (713) of the hydrogen fuel collecting cavity (7); the cooling plate (6) is provided with a cooling through hole (12).

7. The dual fuel combustion nozzle according to claim 6, characterized in that: The cooling through holes (12) are inclined holes arranged in a circumferential direction; and / or, the cooling through holes (12) extend along the circumference of the cooling plate 6, and their center lines are 30-60 degrees with the center axis of the cooling plate (6); and / or, the aperture of the cooling through holes (12) is 0.2-1.0 times the aperture of the liquid hydrocarbon spray hole.

8. The dual fuel combustion nozzle according to claim 1, characterized in that: A cyclone is provided in the second air passage (3).

9. The dual fuel combustion nozzle according to any one of claims 1 to 8, characterized in that: When the flow rate is 0.3-0.5, the aperture of the liquid hydrocarbon spray hole is 2-4 mm.

10. An engine combustion chamber comprising the dual fuel combustion nozzle according to claims 1-9.

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