CN220287506U

CN220287506U - Dual-fuel air premixing nozzle

Info

Publication number: CN220287506U
Application number: CN202321984765.4U
Authority: CN
Inventors: 莫仪然; 刘海旭; 朱灏楠; 仇园; 刘维兵
Original assignee: Qingqi Power Beijing Technology Co ltd
Current assignee: Qingqi Power Beijing Technology Co ltd
Priority date: 2023-07-27
Filing date: 2023-07-27
Publication date: 2024-01-02
Anticipated expiration: 2033-07-27

Abstract

The utility model discloses a dual-fuel air premixing nozzle, which comprises the following scheme: the air inlet device comprises a nozzle body, a first fuel pipe, a second fuel pipe and an air inlet, wherein the first fuel pipe, the second fuel pipe and the air inlet are arranged on the nozzle body; the air inlet holes comprise a first air inlet hole and a second air inlet hole, and the first air inlet hole and the second air inlet hole are arranged as radial chamfer openings; the first air inlet is opposite to the chamfer direction of the second air inlet. Through the arrangement of the utility model, the nozzle body is provided with the first air inlet and the second air inlet, the two air inlets are provided with radial chamfer openings and have opposite chamfer directions, so that two-stage rotational flow can be formed after the air enters the nozzle body, the mixing of fuel and air is enhanced, and meanwhile, the two-stage rotational flow directions are opposite, so that the air flow can return to the axial direction after passing through the two-stage rotational flow, the circumferential mixing effect of the air flow is ensured, the air flow is jetted along the axial direction, and the flow field performance is improved.

Description

Dual-fuel air premixing nozzle

Technical Field

The utility model relates to the technical field of gas turbines, in particular to a dual-fuel air premixing nozzle.

Background

The gas turbine has the advantages of high efficiency, small volume, light weight, simple maintenance, good maneuverability, high automation degree, low manufacturing cost and the like, and is widely applied to aviation, land power generation, natural gas transportation, petroleum, railway and shipbuilding industries.

Under the condition that the modern energy source is rich and various, besides natural gas, hydrogen, ammonia, a large amount of industrial byproduct gas, oilfield associated gas, biomass energy and the like exist, and the traditional gas turbine combustion chamber nozzle cannot be suitable for various energy sources, so that the energy sources are seriously wasted;

the combustion chamber of the traditional gas turbine has low energy utilization efficiency, high emission, serious noise, high difficulty in multi-fuel energy combustion control, high difficulty in mixing of hydrogen and ammonia, and high requirement on the internal flow field structure of the nozzle.

Disclosure of Invention

The present utility model aims to solve at least one of the problems of the background art described above, and provides a dual fuel air premixing nozzle.

To achieve the above object, a dual fuel air premixing nozzle of the present utility model includes:

the air inlet device comprises a nozzle body, a first fuel pipe, a second fuel pipe and an air inlet, wherein the first fuel pipe, the second fuel pipe and the air inlet are arranged on the nozzle body;

the air inlet holes comprise a first air inlet hole and a second air inlet hole, and the first air inlet hole and the second air inlet hole are arranged as radial chamfer openings;

the first air inlet is opposite to the chamfer direction of the second air inlet.

Preferably, a mounting plate is provided within the nozzle body;

the mounting plate separates the interior space of the nozzle body to form a fuel cavity and a blending cavity.

Preferably, the fuel chamber includes a first fuel passage and a second fuel passage that are independent of each other;

the first fuel passage is connected with the first fuel pipe, and the second fuel passage is connected with the second fuel pipe;

the mixing cavity is connected with the air inlet.

Preferably, a first inlet hole and a second inlet hole are provided on the mounting plate;

the first incidence hole is communicated with the first fuel channel and the mixing cavity;

the second inlet aperture communicates the second fuel passage with the blending chamber.

Preferably, the first incident hole is disposed orthogonal to the second incident hole.

Preferably, the second incident hole is disposed close to the air inlet hole.

Preferably, the first incident hole is disposed close to the air inlet hole.

Preferably, the radial chamfer opening has a chamfer angle in the range of 20 ° -40 °.

Preferably, the first air inlet and the second air inlet are provided as key-shaped holes.

Preferably, a mounting flange is provided on the nozzle body.

Based on the above, the utility model has the beneficial effects that:

1. according to the scheme, the first air inlet and the second air inlet are formed in the nozzle body, and the first air inlet and the second air inlet are radial inclined openings, so that air can form rotational flow after entering the nozzle body, the mixing effect is improved, meanwhile, the shearing force of the air can be further enhanced by two layers of rotational flow, and the mixing effect is further improved;

in addition, the beveling directions of the first air inlet and the second air inlet are opposite, so that the air flow can return to the axial direction after two-stage rotational flow, the circumferential mixing effect of fuel and air is ensured, the air flow can be axially jetted, the flow field performance is improved, and the flow field structure of the combustion chamber is facilitated;

2. according to the scheme, the first fuel channel and the second fuel channel which are mutually independent are arranged in the nozzle body, the first fuel pipe is connected with the first fuel channel, the second fuel pipe is connected with the second fuel channel, and after fuel enters the nozzle body through the first fuel pipe or the second fuel pipe, air flow stabilization can be carried out in the two channels, so that the fuel sprayed from the two channels has good initial average degree, the mixing effect can be improved, combustion is more stable, and the backfire problem is avoided;

3. according to the scheme, the mounting plate is arranged in the nozzle body, the first inlet holes and the second inlet holes are formed in the mounting plate, and the first inlet holes and the second inlet holes are arranged in a staggered mode, so that fuels sprayed through the two inlet holes can be pre-mixed at first time, further flow fields and uniformity of two fuels at the downstream are kept consistent, better mixing effect is achieved, and simultaneously equivalent ratio distribution of the two fuels is easier to control;

4. according to the scheme provided by the utility model, the second incident hole is arranged close to the air inlet hole, so that the fuel sprayed out from the first incident hole can be contacted with air more quickly, the mixing effect of the fuel and the air is improved, meanwhile, the first incident hole is also arranged close to the air inlet hole, so that the second fuel is mixed with the air more quickly, the junction of the first fuel and the second fuel is also closer to the air, the faster mixing of the fuel and the air can be realized, and the integral mixing effect is further improved.

Drawings

FIG. 1 schematically illustrates a perspective view of a dual fuel air premixing nozzle in accordance with one embodiment of the present utility model;

FIG. 2 schematically illustrates a top view of a dual fuel air premixing nozzle in accordance with an embodiment of the present utility model;

FIG. 3 schematically illustrates a cross-sectional view in the direction A-A' of FIG. 2 of one embodiment of the present utility model;

description of the drawings: the fuel injection nozzle comprises a nozzle body 10, a fuel cavity 101, a first fuel passage 1011, a second fuel passage 1012, a mixing cavity 102, a first fuel pipe 20, a second fuel pipe 30, an air inlet 40, a first air inlet 401, a second air inlet 402, a mounting plate 50, a first inlet hole 501, a second inlet hole 502, and a mounting flange 60.

Detailed Description

The present disclosure will now be discussed with reference to exemplary embodiments. It should be understood that the embodiments discussed are merely to enable those of ordinary skill in the art to better understand and thus practice the teachings of the present utility model and do not imply any limitation on the scope of the utility model.

As used herein, the term "comprising" and variants thereof are to be interpreted as meaning "including but not limited to" open-ended terms. The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment.

Fig. 1 schematically illustrates a perspective view of a dual fuel air premixing nozzle according to an embodiment of the present utility model, fig. 2 schematically illustrates a top view of a dual fuel air premixing nozzle according to an embodiment of the present utility model, fig. 3 schematically illustrates a cross-sectional view in the direction A-A' of fig. 2 according to an embodiment of the present utility model, as shown in fig. 1-3, a dual fuel air premixing nozzle according to the present utility model comprises:

a nozzle body 10, a first fuel pipe 20, a second fuel pipe 30, and an air inlet 40 provided on the nozzle body 10;

the air inlet 40 includes a first air inlet 401 and a first air inlet 402, the first air inlet 401 and the second air inlet 402 being provided as radial beveled openings;

the first air inlet holes 401 are chamfered in the opposite direction to the second air inlet holes 402.

Specifically, in the traditional gas turbine, the fuel adaptability of the gas turbine combustion chamber nozzle is poor, the nozzle cannot be matched with the current abundant and various energy types, besides natural gas, the nozzle cannot be applicable to hydrogen and ammonia which also exist, and even a large amount of industrial byproduct gas, oilfield associated gas, biomass energy and the like, and the energy is seriously wasted;

according to the utility model, the first fuel pipe 20 and the second fuel pipe 30 are arranged on the nozzle body 10, so that the nozzle can blend various fuels at the same time, can be applicable to various types of energy sources in the current generation, can be applied to different scenes, and can properly reduce the natural gas proportion after blending, save resources, reduce the generation of pollutants, further reduce the emission of pollutants and protect the environment when the main fuel is natural gas and the auxiliary fuel is hydrogen and other clean energy sources.

Meanwhile, the nozzle body 10 is provided with the air inlet 40, which comprises a first air inlet 401 and a second air inlet 402, wherein the first air inlet 401 and the second air inlet 402 are provided with radial chamfer openings, and the chamfer directions are opposite, and the arrangement of the chamfer openings can enable air to form rotational flow in the nozzle body 10 after entering through the first air inlet 401 and the second air inlet 402, and fuel is stirred by utilizing the shearing force of two-stage rotational flow air, so that the mixing effect is improved; meanwhile, the beveling directions of the two layers are opposite, so that the air flow can return to the axial direction after passing through the two layers of rotational flows, the flow field performance is improved, and the flow field structure of the combustion chamber is facilitated.

Further, a mounting plate 50 is provided in the nozzle body 10;

the mounting plate 50 partitions the interior space of the nozzle body 10 to form a fuel cavity 101 and a blending cavity 102.

The fuel chamber 101 includes a first fuel passage 1011 and a second fuel passage 1012 that are independent of each other;

the first fuel passage 1011 is connected to the second fuel pipe 20, and the second fuel passage 1012 is connected to the second fuel pipe 30;

the blending chamber 102 is connected to the air inlet 40.

Specifically, the first fuel pipe 20 is inserted into the nozzle body 10 from the outside thereof, extends to the mounting plate 50, is fixedly and sealingly connected to the mounting plate 50, and a space enclosed between the first fuel pipe 20 and the mounting plate 50 in the nozzle body 10 is a first fuel passage 1011.

Meanwhile, the space surrounded by the first fuel pipe 20, the mounting plate 50 and the nozzle body 10 is the second fuel channel 1012, the second fuel pipe 30 is connected with the second fuel channel 1012, when fuel enters the nozzle body 10 through the arrangement of the first fuel channel 1011 and the second fuel channel 1012, the air flow is stabilized through one section of fuel channel, the fuel cannot be immediately contacted with air for mixing, the good initial average degree can be ensured when the fuel is sprayed out, the mixing effect is further improved, the fuel is more stable, and the backfire problem is avoided.

Further, a first inlet hole 501 and a second inlet hole 502 are provided on the mounting plate 50;

the first inlet hole 501 communicates the first fuel passage 1011 with the blending chamber 102;

the second inlet aperture 502 communicates the second fuel passage 1012 with the blending chamber 102.

With the above arrangement, the first fuel can be ejected through the first inlet hole 501 into the blending chamber 102 for blending, and the second fuel can be ejected through the second inlet hole 502 into the blending chamber 102 for blending.

Further, the first input holes 501 are staggered with the second input holes 502, preferably the first input holes 501 are arranged orthogonal to the second input holes 502.

Specifically, as shown in fig. 3, the first fuel pipe 20 is disposed coaxially with the second fuel pipe 30, and the first fuel pipe 20 is located on the central axis of the nozzle body 10, and at this time, the first inlet holes 501 and the second inlet holes 502 are staggered, so that there are two embodiments in the scheme of the present utility model.

The first is that the first inlet hole 501 is in the horizontal direction, and the second inlet hole 502 is in the vertical direction, in this way, after the fuel is ejected from the two inlet holes, the fuel is mixed in a staggered manner in the middle area of the nozzle body 10, so as to realize the pre-mixing of the two fuels.

The second is that the first inlet hole 501 is in the vertical direction, and the second inlet hole 502 is in the horizontal direction, in this way, after the fuel is ejected from the two inlet holes, the fuel is mixed in a staggered manner in the area of the nozzle body 10 near the side wall thereof, so as to realize the pre-mixing of the two fuels.

In the first mode, since the mixing position of the two fuels is located in the middle area of the nozzle body 10, the distance between the fuels and the air inlet 40 is far, the contact between the fuels and the air is slow, and meanwhile, since the air enters through the air inlet 40 to form a rotational flow, the staggered mixing area of the two fuels is located in the center of the rotational flow, so that the fuels are less influenced by the rotational flow and cannot be well mixed with the air.

In the second mode, the mixing position of the two fuels is the area of the nozzle body 10 close to the side wall of the nozzle body, so that the mixing area of the fuels is arranged closer to the air inlet holes 40, the fuels can be contacted with air relatively quickly, and the mixing effect is improved; meanwhile, the blending area of the fuel is closer to the flowing area of the rotational flow, the influence of the rotational flow is larger, and compared with the first mode, the second mode can further improve the blending effect.

Further, the second inlet hole 502 is provided near the air inlet hole 40.

So set up, after the air gets into nozzle body 10 through air inlet 40, the air is the biggest in the air inlet 40 department velocity of flow that is closest to, consequently set up second inlet 502 near air inlet 40, can make the fuel more fast with the air contact the time for the fuel is faster with the air collide and mix, can further improve the blending effect.

Further, the first inlet hole 501 is also provided near the air inlet hole 40.

So set up, when second entrance hole 502 is close to air inlet 40, set up first entrance hole 501 also near air inlet 40, can make the fuel that spouts through first entrance hole 501 contact with air equally faster, make the intersection of two fuels also be close to air inlet 40 simultaneously, can blend with the air contact more fast, and then improve the blending effect.

Further, the radial chamfer opening of the first air inlet holes 401 and the second air inlet holes 402 has a chamfer angle ranging from 20 ° to 40 °, and the blending effect of fuel and air is optimal in this range.

Further, the first air inlet 401 and the second air inlet 402 are formed as key-shaped holes, by which the key-shaped holes can make more full use of the limited air inlet space on the side wall of the nozzle body 10, and more air inlets are formed under the same area, thereby improving the air intake and the mixing effect.

Further, a mounting flange 60 is provided on a side wall of the nozzle body 10, and the nozzle body 10 can be fixedly connected to the gas turbine through the mounting flange 60.

In summary, the first air inlet 401 and the second air inlet 402 are provided on the nozzle body 10, and the first air inlet 401 and the second air inlet 402 are both provided as radial chamfer openings, so that the air can form a swirl after entering the nozzle body 10, the blending effect is improved, and meanwhile, the shearing force of the air can be further enhanced by the two layers of swirl, and the blending effect is further improved;

in addition, the beveling directions of the first air inlet 401 and the second air inlet 402 are opposite, so that the air flow can return to the axial direction after two-stage rotational flow, the circumferential mixing effect of fuel and air is ensured, the air flow can be axially jetted, the flow field performance is improved, and the flow field structure of the combustion chamber is facilitated.

Meanwhile, the mounting plate 50 is arranged in the nozzle body 10, and the first inlet holes 501 and the second inlet holes 502 which are arranged in a staggered manner are arranged on the mounting plate 50, so that the fuel sprayed out through the two inlet holes can be mixed at the first time, the effect of pre-mixing is realized, the flow field and uniformity of two fuels at the downstream are kept consistent, the better mixing effect is realized, and the equivalent ratio distribution of the two fuels is easier to control.

The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the utility model referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the utility model. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

It should be understood that, the sequence numbers of the steps in the summary and the embodiments of the present utility model do not necessarily mean the order of execution, and the execution order of the processes should be determined by the functions and the internal logic, and should not be construed as limiting the implementation process of the embodiments of the present utility model.

Claims

1. A dual fuel air premixing nozzle, comprising:

2. A dual fuel air premixing nozzle in accordance with claim 1, characterized in that a mounting plate is provided within the nozzle body;

3. A dual fuel air premixing nozzle in accordance with claim 2, wherein the fuel cavity includes a first fuel passage and a second fuel passage independent of each other;

the mixing cavity is connected with the air inlet.

4. A dual fuel air premixing nozzle in accordance with claim 3, characterized in that a first inlet aperture and a second inlet aperture are provided on the mounting plate;

5. A dual fuel air premixing nozzle in accordance with claim 4, wherein said first inlet aperture is disposed orthogonal to said second inlet aperture.

6. A dual fuel air premixing nozzle in accordance with claim 4, wherein the second inlet aperture is disposed proximate the air inlet aperture.

7. A dual fuel air premixing nozzle in accordance with claim 6, wherein said first inlet aperture is disposed proximate to said air inlet aperture.

8. A dual fuel air premix nozzle as in claim 1 wherein the radial chamfer angle of the chamfer opening ranges from 20 ° to 40 °.

9. A dual fuel air premixing nozzle in accordance with claim 1, wherein the first air inlet and the second air inlet are provided as keyed holes.

10. A dual fuel air premixing nozzle in accordance with claim 1, characterized in that mounting flanges are provided on the side walls of the nozzle body.