Low-emission dual-fuel nozzle with adjustable oil way

Abstract

The invention discloses a low-emission dual-fuel nozzle with an adjustable oil way, and relates to the technical field of gas turbines. The low-emission dual-fuel nozzle with the adjustable oil way comprises a gas fuel grading assembly, a first inner guide pipe, a second inner guide pipe and a mounting cover plate, the gas fuel grading assembly is connected with a liquid fuel core assembly in an inserted mode, and the gas fuel grading assembly is composed of a nozzle body, a flow divider, a third inner guide pipe, a sealing ring and a gas fuel mixing assembly; the liquid fuel core assembly further comprises a core shell, and the core shell is provided with two fixing pin inserting blind holes used for being connected with the fixing pins in an inserted mode. Through the liquid fuel path core-pulling type structure design technical means, the applicability of the dual-fuel nozzle can be improved, multiple design schemes can be matched under the condition that a small number of nozzles are produced, a more convenient way is provided for combustion chamber research and development design, the test verification requirement is met, meanwhile, the test piece input cost is reduced, and the test efficiency is improved. And the design and development progress of the dual-fuel nozzle is effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of gas turbines, in particular to a low-emission dual-fuel nozzle with adjustable oil circuit. Background Art

[0002] Low-emission dual-fuel gas turbines have the advantages of wide fuel application range, high power density, and high efficiency. They are high-end equipment with great application prospects in the energy and power industry. Low-emission dual-fuel combustion chamber design technology is one of the most core technologies in the research and development of low-emission dual-fuel gas turbines, and the low-emission dual-fuel nozzle is the core key component of the low-emission dual-fuel combustion chamber. The success or failure of its design directly determines the success or failure of the development of the low-emission dual-fuel combustion chamber.

[0003] During the design and development of low-emission dual-fuel nozzles, in order to ensure the convenient application and maintenance of nozzle components and realize rapid and efficient dual-fuel switching in the combustion chamber, low-emission dual-fuel nozzles usually adopt a highly integrated integrated structure, that is, the gas fuel working part and the liquid fuel working part are combined into an integral part structure. This makes its processing, manufacturing and performance debugging much more difficult, specifically involving the manufacturing of gas fuel passages, liquid fuel passages and batches of core atomizing elements and other parts, performance debugging of different gas fuel stages, liquid fuel performance debugging and multi-channel collaborative work performance debugging. When high-temperature resistant alloy materials are selected for manufacturing, the total cost of a single nozzle, including material cost and labor cost, is significantly increased compared to conventional single-fuel nozzles.

[0004] On the other hand, since the dual-fuel combustion process involves the blending of gas fuels, atomization, evaporation, blending of liquid fuels, swirl of air, heat transfer, mass transfer and turbulent flow of mixed combustibles and products, the working process is extremely complex, and analysis and finalization by numerical simulation often has certain limitations. In the actual research and development process, it is urgent to use a variety of schemes such as different liquid fuel injection starting points, different liquid fuel atomization cone angles, different liquid fuel swirl intensities and different auxiliary atomization air configurations for test verification and adjustment. That is, the design and development of low-emission dual-fuel nozzles needs to verify the specific performance through test simulation under more design schemes, and then the effectiveness of the scheme can be confirmed through performance comparison. This makes the R&D cost, especially the processing and manufacturing cost, double in geometric series, and the development cycle increases. Even under the condition of quite high investment, it is not necessarily possible to obtain the most ideal design scheme, and there is also the risk of development failure.

[0005] Therefore, it is urgent to improve this R&D dilemma, reduce R&D costs, and improve R&D efficiency. The present invention can effectively solve this problem. It uses a single dual-fuel nozzle to achieve multiple solutions, meet test requirements and reduce costs. Summary of the invention

[0006] In view of the deficiencies of the prior art, the present invention provides a low-emission dual-fuel nozzle with adjustable oil circuit, which solves the problems raised in the above-mentioned background technology.

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a low-emission dual-fuel nozzle with adjustable oil circuit, comprising a gas fuel staging assembly, a first inner conduit, a second inner conduit and a mounting cover plate, characterized in that: the gas fuel staging assembly is plugged with a liquid fuel core assembly, and the gas fuel staging assembly is composed of a nozzle body, a flow divider, a third inner conduit, a sealing ring and a gas fuel blending assembly;

[0008] The liquid fuel core assembly also includes a core shell and an inlet joint, wherein the core shell is a shell structure with an external positioning boss and an internal cavity, and the core shell is provided with two fixing pin plugging blind holes for plugging fixing pins;

[0009] The liquid fuel core assembly passes through the nozzle body and the center hole of the diverter in sequence and abuts against the central plug-in positioning boss on one side of the nozzle body, and the liquid fuel core assembly is fixed to the nozzle body through a fixing pin.

[0010] A further improvement of the technical solution of the present invention is that the nozzle body is a shell structure provided with an axial center hole, four medium inlets and four medium channels, the four medium inlets are connected to the four medium channels, and one end of the two medium channels that penetrate the nozzle body is provided with a threaded conical joint, and is respectively connected to the first inner conduit and the second inner conduit, and the two medium channels are respectively connected to the two inlet joints of the liquid fuel core assembly to form a high-temperature and high-pressure air cavity.

[0011] A further improvement of the technical solution of the present invention is that: the flow divider is a transition support structure provided with a central hole and a flow divider annular wall;

[0012] The nozzle body is welded to the diverter after being plugged into the outer wall of the axial center hole to maintain coaxiality, and the nozzle body is sealed after being connected to the outer ring through a sealing ring to form a first ring cavity and a second first ring cavity for medium buffering transition, and the nozzle body and the diverter are respectively connected to the first channel and the second channel of the nozzle body.

[0013] A further improvement of the technical solution of the present invention is that the gas-fuel mixing assembly is provided with a two-way second annular cavity, and a second air cyclone is provided on one side of the two-way second annular cavity, the two-way second annular cavity is communicated with the internal air inlet hole of the swirl blade of the second air cyclone, the third inner conduit is axially distributed between the outer side of the sealing ring and the gas-fuel mixing assembly, and the two-way first annular cavity is communicated with the two-way second annular cavity through the third inner conduit.

[0014] A further improvement of the technical solution of the present invention is that the diverter further includes the following specific settings:

[0015] The flow divider is provided with eight groups of communicating holes and eight radial air inlet holes, and the eight communicating holes are evenly distributed axially, and the eight communicating holes and the eight radial air inlet holes are staggered and distributed alternately.

[0016] A further improvement of the technical solution of the present invention is that the first inner conduit and the second inner conduit are arranged inside the high-temperature and high-pressure air cavity.

[0017] A further improvement of the technical solution of the present invention is that the third inner conduit further includes the following specific configurations:

[0018] The number of the third inner conduits is N, and 4≤N≤8, and the third inner conduits are evenly distributed along the axial direction.

[0019] A further improvement of the technical solution of the present invention is that the liquid fuel core assembly also includes a first inlet joint and a second inlet joint, the axes of the first inlet joint and the second inlet joint are arranged according to axial misalignment and axial symmetry, and the angle formed by the projections of the two axes in the plane perpendicular to the axis is 30-90°.

[0020] Beneficial Effects

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. Through the core-pulling structure design technology of the liquid fuel path, the applicability of the dual-fuel nozzle can be improved. A variety of design schemes can be matched under the condition of producing a small number of nozzles, providing a more convenient way for the research and development of the combustion chamber. While ensuring the test verification requirements, the investment cost of the test pieces is reduced, which effectively improves the design and development progress of the dual-fuel nozzle;

[0023] 2. The present invention can also be applied to the combustion chambers of gas turbines with different power levels and different operating parameters, providing the best low-emission dual-fuel combustion effect. During operation, only the core assembly needs to be replaced.

[0024] 3. The present invention fixes the liquid fuel core assembly by fixing pins on both sides, which has the characteristics of high temperature resistance. Compared with threads, it can avoid the situation where the threads are difficult to disassemble due to bite failure caused by long-term operation under high temperature conditions. It is especially suitable for a large number of debugging tests in the combustion chamber debugging stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the AA section in the present invention;

[0027] Figure 3 It is a structural schematic diagram of the BB section in the present invention;

[0028] Figure 4 It is an enlarged view of the K view in the BB view of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the CC section in the present invention;

[0030] Figure 6 It is a schematic structural diagram of the liquid fuel core assembly in the present invention.

[0031] In the figure:

[0032] 0. Gas fuel staging assembly; 1. Liquid fuel core assembly;

[0033] 2. Install the cover plate; 3. Nozzle body; 4. Diverter; 5. Gas fuel blending assembly; 6. First inner conduit; 7. Second inner conduit; 8. Third inner conduit; 9. Sealing ring; 10. Fixing pin; 11. Fastener;

[0034] 1-1, first inlet joint; 1-2, second inlet joint; 1-3, core shell; 1-3a, outer positioning boss; 1-3b, sleeve ring; 1-3c, center outlet; 1-3d, outer ring outlet; 1-3e, end face of boss in cavity; 1-4, nozzle; 1-4a, nozzle outlet; 1-5, cyclone; 1-6, clamping screw plug; 1-7, sealing ring; 1-8, clamping nut; 1-A, first medium channel; 1-B, second medium channel; 1-C, cooling air ring cavity; 1-D, positioning pin plug blind hole; 1-E, first medium inlet; 1-F, second medium inlet; 1-G, third air inlet ring groove; 1-H, fin groove;

[0035] 3-A, the first channel of the body; 3-B, the second channel of the body; 3-C, the third channel of the body; 3-D, the fourth channel of the body; 3-E, the positioning pin plug-in through hole; 3-F, the axial center hole; 3a, the center hole plug-in positioning boss; 3b, the cover plate sleeve boss; 3c, the screw mounting hole;

[0036] 4, flow divider; 4a, flow divider ring wall; 4-C, center hole; 4-A, connecting hole; 4-B, radial air inlet hole;

[0037] 5. gas fuel blending assembly; 5-1. first air swirler; 5-2. second air swirler; 5-3. venturi; 5-4. cup-shaped member; 5-5. ring cover; 5-A. air intake cooling hole;

[0038] 9. Sealing ring;

[0039] M1, first ring cavity one; M2, second ring cavity one; N1, first ring cavity two; N2, second ring cavity two; P, high temperature and high pressure air cavity; Q, combustion zone. DETAILED DESCRIPTION

[0040] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0041] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0042] In addition, in order to better illustrate the present application, numerous specific details are provided in the specific examples below. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, and elements well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0043] Embodiment 1, a low-emission dual-fuel nozzle with adjustable oil circuit of the present invention comprises a gas fuel staging assembly 0, a liquid fuel core assembly 1, a first inner conduit 6, a second inner conduit 7, a mounting cover plate 2, a fixing pin 10 and a fastener 11;

[0044] The gas fuel staging assembly 0 comprises a nozzle body 3, a flow divider 4, a third inner conduit 8, a sealing ring 9 and a gas fuel blending assembly 5;

[0045] The nozzle body 3 is a shell structure with an axial center hole 3-F and four medium channels;

[0046] The flow divider 4 is a transition support structure with a central hole 4-C and a flow divider annular wall 4a;

[0047] The nozzle body 3 and the diverter 4 are connected by welding after being plugged into the outer wall of the axial center hole 3-F to maintain coaxiality, and are sealed by the sealing ring 9 after the outer ring is connected, forming a first annular cavity M1 and a second first annular cavity N1 for medium buffering transition, which are respectively connected to the first channel 3-A of the gas fuel body and the second channel 3-B of the body of the nozzle body 3; the right side of the diverter 4 is connected to the inner center hole of the gas fuel blending component 5 by plugging into the outer wall of the center hole 4-C and welded after axially close, forming a second annular cavity M2 for pressure stabilization, the left end of which is connected to the first annular cavity M1 through the connecting hole 4-A of the diverter 4, and the right end is connected to the internal air inlet hole of the swirl blade of the first air swirler 5-1 of the gas fuel blending component 5; the gas fuel blending component 5 is provided with a second second annular cavity N2, which is connected to the internal air inlet hole of the swirl blade of the second air swirler 5-2, and eight third inner conduits 8 are evenly distributed circumferentially ( Figure 3 ) is arranged between the outer side of the sealing ring 9 and the gas fuel blending assembly 5, and is welded to the respective communicating holes, so that the two-way first ring cavity N1 and the two-way second ring cavity N2 are connected, and finally an integrated gas fuel staging assembly 0 is formed; the liquid fuel core assembly 1 is connected to the gas fuel staging assembly 0 by plugging, specifically, the liquid fuel core assembly 1 passes through the center holes of the nozzle body 3 and the diverter 4 in turn and is plugged into the positioning boss 3a of the center hole on the left side of the nozzle body 3 and is tightly attached, and then is clamped and fixed by the fixing pin 10; the nozzle cover plate 2 is connected by the fastener 1 1 is connected to the nozzle body 3, and four medium inlets are arranged on the nozzle body 3, which are connected to four medium channels, of which two channels are provided with threaded cone joints after passing through the nozzle body 3 and connected to the first inner conduit 6 and the second inner conduit 7 respectively, and then connected to the two inlet joints 1-1 and 1-2 of the liquid fuel core assembly 1 respectively, together forming the overall structure of the dual-fuel low-emission nozzle of the detachable liquid fuel core assembly 1, which is used to be installed in the gas turbine and related test equipment, etc. After installation, all structures except the installation cover plate 2 are in the high-temperature and high-pressure air cavity P. Example 2, as Figure 1 and Figure 3As shown, the liquid fuel core assembly 1 is a structural assembly independently used for liquid fuel atomization, and as a whole includes three medium interfaces (the first medium inlet 1-E, the second medium inlet 1-F and the third air intake ring groove 1-G) and three medium outlets (the nozzle outlet 1-4a, the center outlet 1-3c and the outer ring outlet 1-3d). The specific structure includes a first inlet joint 1-1, a second inlet joint 1-2, a core shell 1-3, a nozzle 1-4, a swirler 1-5, a clamping screw plug 1-6, a sealing ring 1-7 and a clamping nut 1-8, wherein the core shell 1-3 is a shell structure with an external positioning boss 1-3a and an internal cavity, and two medium inlets are arranged in the non-plug-in part, namely the first medium inlet 1-E and the second medium inlet 1-F, which are respectively welded to the first inlet joint 1-1 and the second inlet joint 1-2, and a third air intake ring groove 1-G and a fin groove 1-H are arranged in the middle of the plug-in part of the core shell 1-3 ( Figure 1 , Figure 3 , Figure 4 ), to ensure the cooling and reliable operation of the head; the nozzle 1-4 and the swirler 1-5 are sequentially inserted into the core shell 1-3, and the compression screw plug 1-6, the sealing ring 1-7 and the compression nut 1-8 are sequentially compressed and tightened by threads to form the first medium channel 1-A and the second medium channel 1-B, wherein the first inlet joint 1-1, the first medium inlet 1-E, and the first medium channel 1-A are sequentially connected, and the medium is ejected from the outlet 1-4a of the nozzle 1-4, and the liquid fuel is centrifugally swirled; the second inlet joint 1-2, the second medium inlet 1-F, and the second medium channel 1-B are sequentially connected, and the medium is ejected from the central outlet 1-3c of the core shell 1-3, which can be centrifugally swirled to atomize the liquid fuel, and the atomizing air can be centrifugally swirled to assist the liquid fuel atomization; such as Figure 2 As shown, both sides of the core shell 1-3 are also provided with positioning plug blind holes 1-D that cooperate with the fixing pins 10, which are used for axial and circumferential fixation of the liquid fuel core assembly 1; 12 fin grooves 1-H are evenly distributed circumferentially on the outer ring surface of the outlet end, and a cooling air ring cavity 1-C is formed by positioning welding through the collar 1-3b to improve the uniformity of gas circulation. The cooling air is ejected from the outer ring outlet 1-3d, which effectively protects the end of the liquid fuel core assembly 1; the whole set of components is effectively sealed by the compressed sealing ring 1-7, the nozzle 1-4 and the inner boss end face 1-3e of the core shell 1-3 cavity to prevent medium leakage and mutual circulation between media in different channels. Under the condition of removing the two fixing pins 10, the liquid fuel core assembly 1 can move freely in the axial direction and rotate freely in the circumferential direction within a certain range, ensuring smooth replacement of different core assemblies. When the liquid fuel core assembly 1 is installed, the end face length L of the diverter 4 will protrude. The present invention can use liquid fuel core assemblies 1 with different lengths L to match a complete set of dual-fuel low-emission nozzles to form a desired solution.

[0048] Embodiment 3, the first inlet joint 1-1 and the second inlet joint 1-2 can be Figure 1 The arrangement shown is arranged so that the center axes of the two joints are in the same plane.

[0049] Preferably, the axis of the first inlet connector 1-1 and the second inlet connector 1-2 can be arranged according to Figure 6 The arrangement shown is axially staggered and circumferentially symmetrical, and the angle α∈(30-90°) formed by the projections of the two axes in the plane perpendicular to the axis ensures that the overall structure of the low-emission dual-fuel nozzle is more compact and easier to install.

[0050] Embodiment 4, as Figure 1 , Figure 2 and Figure 5 As shown, the nozzle body 3 is a shell structure with an axial center hole 3-F and a fuel channel, which is used to form a low-emission dual-fuel nozzle mounting support and plug-in liquid fuel core assembly 1, specifically including a first channel 3-A of the body, a second channel 3-B of the body, and a third channel 3-C of the body ( Figure 5 ) and the fourth channel 3-D ( Figure 5 ), wherein the first channel 3-A of the body is used for the flow of the first gas fuel, and the second channel 3-B of the body is used for the flow of the second gas fuel, and the two cooperate with fuel grading to achieve low emission of gas fuel, wherein the flow rate of the second gas fuel is greater than the flow rate of the first gas fuel, the first gas fuel is used for starting and low working conditions, and the second gas fuel is used for high working conditions; the third channel 3-C of the body is used for the flow of liquid fuel, and the fourth channel 3-D of the body is used for the flow of auxiliary atomizing air or liquid fuel; Figure 2 As shown, a fixing pin 10 is provided on each side of the inlet end of the center hole to be inserted into the through hole 3-E, and the fixing pin 10 is installed in an interference fit manner to ensure that the fixing pin is firmly installed; Figure 1 As shown, the left end of the nozzle body 3 is provided with a cover plate sleeve boss 3b of the cover plate 2 and a screw mounting hole 3c, which are used to fasten and seal with the cover plate 2 and further used to fix the entire nozzle structure to the combustion chamber casing or the combustion test device.

[0051] like Figure 1 As shown, the flow divider 4 is a transition support structure with a central hole 4-C and a flow divider annular wall 4a, which is mainly used to connect the nozzle body 3 and the gas fuel blending assembly 5, and form a graded gas fuel independent flow cavity, that is, the first annular cavity M1 of the first path and the first annular cavity N1 of the second path; Figure 1 , Figure 3 and Figure 4As shown, M1 and M2 are connected through the connecting hole 4-A. A preferred solution of 4-A is that every two holes are in a group, with a total of 8 groups, which are evenly distributed circumferentially. On the one hand, this arrangement can ensure that the airflow can be distributed as evenly as possible under the condition of smooth flow, playing a role in rectification and equalization. On the other hand, it can avoid the increase in radial size caused by 8 groups of single large holes, effectively reduce the radial space size, and improve the overall compactness of the nozzle; as shown in FIG. Figure 3 and Figure 4 The flow divider 4 is also provided with eight radial air inlet holes 4-B (the air inlet direction is shown by the centripetal arrow in the figure), which are evenly distributed in the circumferential direction and staggered and evenly distributed with the through hole 4-A, and are connected with the third air inlet ring groove 1-G of the liquid fuel core assembly, and then connected with the high-temperature and high-pressure air cavity P of the combustion chamber and the cooling air ring cavity 1-C, so as to realize effective cooling and purging of the head of the liquid fuel core assembly 1 ( Figure 1 The flow direction of the arrow in the middle) reduces the formation and adhesion of carbon deposits and effectively protects the medium outlet end of the liquid fuel core assembly 1.

[0052] like Figure 1 As shown, the gas fuel mixing assembly 5 mainly includes a first air swirler 5-1, a second air swirler 5-2, a venturi tube 5-3, a cup-shaped part 5-4 and a ring cover 5-5, and the overall arrangement is a two-stage radial graded structure, wherein the swirl blades of the first air swirler 5-1 and the second air swirler 5-2 are designed as a cavity structure, and are designed with air inlet holes, and gas fuel injection holes are designed on the blade surface to achieve effective and uniform mixing of gas fuel with swirl air in a transverse jet manner, which is conducive to low-emission combustion. Inlet annular cavity channels M2 and N2 are set at the inlet channels of the two-stage swirler blades to ensure that the fuel steady flow further enhances the distribution uniformity; 16 circumferentially evenly distributed intake cooling holes 5-A are set around the venturi tube 5-3, and flow out from the two-stage annular gaps to form a wall-attached air film for cooling protection; after the gas fuel and air are premixed in the two-stage radial direction, they flow out from the corresponding premixing channels and finally enter the combustion zone Q in the combustion chamber to form a low-temperature flame and achieve the low-emission target. As shown Figure 1 As shown, the sealing ring 9 is a thin-walled short tubular structure, and eight through-hole structures are evenly arranged on the tube wall along the circumferential direction, which is used to connect the third inner conduit 8; the mounting cover plate 2 is used for positioning and installing the entire nozzle, and is provided with a fastener 11 positioning and installing hole. The first inner conduit 6 and the second inner conduit 7 are both curved tube structures with connecting nuts and sealing ball heads at both ends, which can achieve quick disassembly and assembly.

[0053] The liquid fuel core assembly 1 can use media including but not limited to diesel, kerosene and other liquid fuels, and the gas fuel blending assembly 5 can use media including but not limited to natural gas, hydrogen and other gas fuels. The first inner conduit 6 and the second inner conduit 7 can supply liquid fuel at the same time, so that the liquid fuel can be supplied in stages according to the working conditions; the first inner conduit 6 can also supply liquid fuel, while the second inner conduit can supply auxiliary atomizing air, so as to assist droplet breakage of the liquid fuel in various working conditions, strengthen atomization and rapid evaporation combustion, and improve the combustion effect; the gas or liquid fuel and other media can be supplied in stages according to the specific scheme of the liquid fuel core assembly.

[0054] In summary, when different scheme tests are required, the following operations can be performed: remove the fasteners 11 between the low-emission dual-fuel nozzle mounting cover plate 2 and the mounting casing (or the combustion chamber test device housing, etc.), so that the low-emission dual-fuel nozzle is detached from the mounting casing (or the combustion chamber test device housing, etc.), and the dual-fuel nozzle is in an independent state. After the low-emission dual-fuel nozzle is fixed by the relevant clamp, loosen the fastening nuts at both ends of the first inner conduit 6 and the second inner conduit 7, so that the first inner conduit 6 and the second inner conduit 7 are detached from the threaded joints of the third channel 3-C of the nozzle body 3 and the fourth channel 3-D of the body, as well as the first inlet joint 1-1 and the second inlet joint 1-2 of the liquid fuel core assembly 1, and the liquid fuel core assembly is in an independent state without a connecting pipe connected thereto. On this basis, the liquid fuel core assembly 1 can be removed after the fixing pins 10 are removed from both sides of the low-emission dual-fuel nozzle, that is, the liquid fuel core assembly 1 is pulled out from the axial center hole of the nozzle body 3 to achieve the "core pulling" function. After the liquid fuel core assembly is removed, when a liquid fuel core assembly 1 with a different solution (adjustable length, atomizing cone angle, swirl intensity, auxiliary atomizing air matching and other injection solutions) needs to be installed, the liquid fuel core assembly can be replaced in the reverse process of the above process to achieve different low-emission dual-fuel nozzle overall solutions and liquid fuel core assembly 1 replacement solutions. For example, Figure 1 As shown, when the liquid fuel core assembly of different lengths L is replaced, the atomization effect of the liquid fuel can be adjusted, and the gas fuel injection cross-sectional size H can be adjusted at the same time to improve the mixing effect of the gas fuel and air.

[0055] Preferably, the liquid fuel core assembly 1 of the present invention can be used to provide gas fuel alone, so that the entire dual-fuel nozzle is fully supplied with gas fuel in multiple stages to match different working conditions of the combustion chamber and the gas turbine.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-emission dual-fuel nozzle with adjustable oil circuit, comprising a gas fuel staging assembly, a first inner conduit, a second inner conduit and a mounting cover plate, characterized in that: The gas fuel staging assembly is plugged with a liquid fuel core assembly, and the gas fuel staging assembly is composed of a nozzle body, a flow divider, a third inner conduit, a sealing ring, and a gas fuel blending assembly; The liquid fuel core assembly also includes a core shell and an inlet joint, wherein the core shell is a shell structure with an external positioning boss and an internal cavity, and the core shell is provided with two fixing pin plugging blind holes for plugging fixing pins; The liquid fuel core assembly passes through the nozzle body and the center hole of the diverter in sequence and abuts against the central plug-in positioning boss on one side of the nozzle body, and the liquid fuel core assembly is fixed to the nozzle body through a fixing pin.

2. A low-emission dual-fuel nozzle with adjustable oil circuit according to claim 1, characterized in that: The nozzle body is a shell structure provided with an axial center hole, four medium inlets and four medium channels, the four medium inlets are connected to the four medium channels, and one end of the two medium channels that penetrate the nozzle body is provided with a threaded conical joint, and is respectively connected to the first inner conduit and the second inner conduit, and the two medium channels are respectively connected to the two inlet joints of the liquid fuel core assembly to form a high-temperature and high-pressure air cavity.

3. A low-emission dual-fuel nozzle with adjustable oil circuit according to claim 2, characterized in that: The flow divider is a transition support structure provided with a central hole and a flow divider annular wall; The nozzle body is welded to the diverter after being plugged into the outer wall of the axial center hole to maintain coaxiality, and the nozzle body is sealed after being connected to the outer ring through a sealing ring to form a first ring cavity and a second first ring cavity for medium buffering transition, and the nozzle body and the diverter are respectively connected to the first channel and the second channel of the nozzle body.

4. A low-emission dual-fuel nozzle with adjustable oil circuit according to claim 3, characterized in that: The gas fuel blending assembly is provided with a two-way second annular cavity, and a second air swirler is provided on one side of the two-way second annular cavity, the two-way second annular cavity is communicated with the internal air inlet hole of the swirl blade of the second air swirler, the third inner conduit is axially distributed between the outer side of the sealing ring and the gas fuel blending assembly, and the two-way first annular cavity is communicated with the two-way second annular cavity through the third inner conduit.

5. The low-emission dual-fuel nozzle with adjustable oil circuit according to claim 3, characterized in that: The splitter also includes the following specific settings: The flow divider is provided with eight groups of communicating holes and eight radial air inlet holes, and the eight communicating holes are evenly distributed axially, and the eight communicating holes and the eight radial air inlet holes are staggered and distributed alternately.

6. The low-emission dual-fuel nozzle with adjustable oil circuit according to claim 1, characterized in that: The first inner conduit and the second inner conduit are arranged inside the high-temperature and high-pressure air cavity.

7. The low-emission dual-fuel nozzle with adjustable oil circuit according to claim 1, characterized in that: The third inner conduit also includes the following specific configurations: The number of the third inner conduits is N, and 4≤N≤8, and the third inner conduits are evenly distributed along the axial direction.

8. The low-emission dual-fuel nozzle with adjustable oil circuit according to claim 1, characterized in that: The liquid fuel core assembly also includes a first inlet joint and a second inlet joint, the axes of the first inlet joint and the second inlet joint are arranged in an axially staggered and axially symmetrical manner, and the angle formed by the projections of the two axes in the plane perpendicular to the axis is 30-90°.

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