CN114838386B - Gas fuel nozzle for low-pollution combustion chamber - Google Patents
Gas fuel nozzle for low-pollution combustion chamber Download PDFInfo
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- CN114838386B CN114838386B CN202210418208.XA CN202210418208A CN114838386B CN 114838386 B CN114838386 B CN 114838386B CN 202210418208 A CN202210418208 A CN 202210418208A CN 114838386 B CN114838386 B CN 114838386B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23R—GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS
- F23R3/00—Continuous combustion chambers using liquid or gaseous fuel
- F23R3/28—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply
- F23R3/286—Continuous combustion chambers using liquid or gaseous fuel characterised by the fuel supply having fuel-air premixing devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)
- Spray-Type Burners (AREA)
Abstract
The utility model belongs to the aeroengine field, in particular to a gas fuel nozzle for low pollution combustion chamber, this scheme carries out throttle-distribution-throttle-four steps with the gas fuel that the nozzle got into and handles, through setting up throttling arrangement, reduces and controls the flow coefficient of nozzle, weakens the influence of nozzle spout aperture size to fuel flow to guarantee the homogeneity of fuel flow distribution between different nozzles, between the different jet orifices of nozzle, increase the nozzle pressure drop simultaneously, reduce the sensitivity of nozzle fuel flow to the pressure fluctuation in combustion chamber, improve combustion stability.
Description
Technical Field
The application belongs to the field of aero-engines, and in particular relates to a gas fuel nozzle for a low-pollution combustion chamber.
Background
With the emphasis of environmental protection, strict requirements are put on pollutant emission of industrial gas turbines in countries around the world, in order to keep pollutant emission at a low level, lean premixed combustion technology is widely adopted, but combustion instability is very easy to occur in a combustion organization mode, particularly, a single-tube combustion chamber or a ring-tube combustion chamber (generally composed of 6-20 flame tubes, nozzles and the like) for combusting gaseous fuel, each combustion chamber is a relatively independent combustion system, if non-uniformity occurs in air distribution and fuel distribution processes, a combustion temperature field is very easy to change in a combustion chamber, combustion becomes unstable, pressure fluctuation occurs in the combustion chamber, and fuel flow of each nozzle connected in parallel to a fuel manifold is very sensitive to the fluctuation of pressure in the combustion chamber, so that the fuel flow of each nozzle fluctuates, the fluctuation of fuel supply further worsens the combustion stability, and the problems of oscillation combustion, tempering and the like occur in the combustion chamber. Meanwhile, for the nozzle of the set value class fuel, the change of the class fuel also directly influences the emission of pollutant NOx in the combustion chamber, and further influences the pollutant emission performance, combustion stability and service life of the combustion chamber of the gas turbine.
At present, in order to control the flow consistency among different nozzles in the same batch, the gaseous fuel nozzle has very high requirements on the machining precision of the nozzle opening size, which greatly increases the difficulty of nozzle machining and maintenance. Meanwhile, the method for strictly controlling the machining precision of the nozzle orifice size at present is most critical, and the problems of uneven fuel distribution and unstable nozzle fuel flow of the combustion chamber in a lower working condition state and unstable combustion cannot be effectively solved.
The invention relates to a gas fuel nozzle design technology of a low-pollution combustion chamber of a gas turbine, which aims to reduce the excessive dependence of fuel distribution of each nozzle connected in parallel on a fuel main pipe on the size of a nozzle by controlling the flow coefficient of different nozzles of the nozzle through the throttling device and the nozzles together by designing the throttling device in the nozzle, increase the pressure drop of the nozzle, reduce the sensitivity of the fuel flow of the nozzle to unstable combustion in the combustion chamber and ensure the uniformity of the fuel flow of each nozzle. Meanwhile, in order to solve the problems of combustion stability and overheating of the end face of the nozzle, the air drainage channel is designed in the nozzle, the introduced air exchanges heat with the on-duty fuel in the nozzle, the temperature of the on-duty fuel is improved, the on-duty stable combustion effect of the on-duty fuel is enhanced, meanwhile, the self temperature is reduced, so that the cleaning effect on the end face of the nozzle is more excellent, and the ablation of the end face of the nozzle is effectively prevented.
The existing gaseous fuel nozzles control flow uniformity among different nozzles only through high machining accuracy of nozzle orifice size, especially for premixed combustor nozzles, mainly have the following problems:
(1) The machining precision requirement of the nozzle size is very high, and the difficulty of machining and maintaining the nozzle is greatly increased;
(2) The number of the nozzles is large, the distribution positions of the nozzles are different, the working environments are different, the size of the nozzles is small, and the nozzles are extremely easy to be influenced by complex environments such as combustion thermal deformation, fuel corrosion, coking carbon deposition and the like in the thermal environment of a combustion chamber;
(3) Because the fuel distribution of each nozzle connected in parallel on the fuel main pipe excessively depends on the size of the nozzle, if the effective area of the nozzle is influenced, the flow of the fuel injected by the nozzle is directly changed, so that the pollutant emission performance, the combustion stability and the service life of the combustion chamber of the gas turbine are influenced;
(4) At present, the sensitivity of each nozzle to unstable combustion in a combustion chamber cannot be effectively controlled only by controlling the jet speed of fuel at the nozzle, and the flow distribution of the nozzle is deteriorated when the unstable combustion occurs in an individual combustion chamber, so that the problems of oscillation combustion, backfire and the like of the combustion chamber are easily caused.
Disclosure of Invention
Before the invention, the inside of the nozzle is not provided with a throttling device, the fuel flow control of each injection hole of the nozzle is completely determined by the high-precision machining size of the nozzle, and the inside of the nozzle is not provided with heat exchange between air and fuel.
According to the scheme, the gas fuel entering the nozzle is subjected to four steps of throttling, distributing, throttling and injecting, the flow coefficient of the nozzle is reduced and controlled by arranging the throttling device, the influence of the aperture size of the nozzle orifice on the fuel flow is weakened, the uniformity of fuel flow distribution among different nozzles and among different injection holes of the nozzle is ensured, meanwhile, the pressure drop of the nozzle is increased, the sensitivity of the fuel flow of the nozzle to pressure fluctuation in a combustion chamber is reduced, and the combustion stability is improved.
Introducing inside air at the nozzle, the air of introducing exchanges heat with the fuel on duty, improves the fuel temperature on duty, and the effect of the steady burning of enhancement value class fuel improves combustion stability, has reduced air temperature simultaneously, has strengthened the clear cooling effect of air to the nozzle terminal surface to solve the overheated problem of nozzle terminal surface, this runner holds the chamber volume controllable, and its natural frequency and a certain characteristic frequency coupling of combustion chamber can restrain the vibration burning under this frequency, and this application provides a gas fuel nozzle for low pollution combustion chamber, includes:
the nozzle shell is provided with an inner cavity, the inner cavity is provided with an inner plug body, the inner plug body comprises a front end and a rear end, the rear end and the nozzle shell form a blowing air heat exchange flow channel, and the front end and the nozzle shell form a blowing air flow channel; the blowing air flow passage is communicated with a blowing air heat exchange flow passage, and the blowing air heat exchange flow passage is communicated with a blowing air jet orifice arranged on the rear end surface of the nozzle shell; the blowing air flow passage is communicated with a blowing air inlet arranged on the wall surface of the nozzle shell; the blowing air enters through the blowing air inlet and enters into the blowing air heat exchange flow passage through the blowing air flow passage, so that the rear end wall surface of the inner plug body is contacted with the blowing cooling air, and the cooling effect is achieved.
The front end of the inner plug body is provided with a fuel distribution cavity, the rear end of the inner plug body is provided with an on-duty fuel channel, the fuel distribution cavity is communicated with the on-duty fuel channel, and the on-duty fuel channel is communicated with an on-duty fuel injection hole arranged on the rear end surface of the nozzle shell; the front end of the inner plug body is provided with a radially arranged premixing spray rod, the premixing spray rod is provided with a premixing grade fuel runner communicated with the fuel distribution cavity, and the premixing grade fuel runner is communicated with premixing grade fuel injection holes arranged at the end part of the premixing spray rod;
the front end of the nozzle shell is connected with a mounting edge which is provided with a fuel inlet interface communicated with the fuel distribution cavity;
wherein: the fuel distribution cavity channel is provided with a total throttling device positioned at the front end of the premixing grade fuel channel, the duty grade fuel channel is provided with a duty grade throttling device, the total throttling device is a throttling hole formed by the protrusion of the inner wall of the fuel distribution cavity channel, and the throttling device is a throttling hole formed by the protrusion of the inner wall of the duty grade fuel channel, so that four steps of throttling, distribution, throttling and injection are realized, namely, the fuel is subjected to the whole flow of throttling device, fuel distribution cavity, throttling device and duty grade fuel injection hole, and the flow coefficient of the nozzle is reduced and controlled by arranging the throttling device, so that the influence of the aperture size of the nozzle on the fuel flow is weakened, the uniformity of fuel flow distribution among different nozzles and among different injection holes of the nozzle is ensured, the pressure drop of the nozzle is increased, the sensitivity of the fuel flow of the nozzle to pressure fluctuation in the combustion chamber is reduced, and the combustion stability is improved.
Preferably, the number of the premixing spray bars is multiple, the premixing spray bars are uniformly distributed along the circumferential direction of the nozzle shell, the premixing spray bars are provided with a plurality of premixing grade fuel injection holes, the premixing grade fuel injection holes are circumferentially arranged along the premixing spray bars, the premixing grade fuel injection holes directly spray fuel in the flame tube, and the premixing grade fuel injection holes with multiple angles realize uniform spraying of the fuel.
Preferably, the number of purge air channels is plural, each purge air channel being located between two adjacent premix burner bars.
Preferably, the premix stage fuel flow passage has orifices formed by projections on the inner wall, and likewise, the fuel is discharged through the premix boom by passing through the total throttle device and then through the premix stage fuel flow passage 15 and finally through the orifices of the premix boom, thereby realizing the throttle-distribution-throttle process.
Preferably, the cross-sectional shape of the orifice of the total throttle device and the orifice of the on-duty fuel flow passage includes: circular, rectangular or cross-shaped.
Preferably, the blowing air heat exchange flow passage is an annular cavity formed by the inner wall of the nozzle shell and the outer wall of the rear end of the inner plug body.
Preferably, the blocking device is arranged at an axial position of the blowing air heat exchange runner, the blocking device is an annular ring with a central hole, the central hole is sleeved on the outer wall of the rear end of the inner plug body, the outer edge of the blocking device is in contact with the inner wall of the nozzle shell, the annular surface of the blocking device is provided with through holes distributed circumferentially, and the blocking device can adjust the axial position of the regulator at the rear end of the inner plug body, so that the volume of the accommodating cavity of the blowing air heat exchange runner is controllable, the natural frequency of the blocking device is coupled with a certain characteristic frequency of the combustion chamber, and oscillation combustion under the frequency can be restrained.
Preferably, the outer wall surface of the rear end of the inner plug body is provided with heat exchange ribs formed by protrusions, and the heat exchange ribs can increase the contact area with cooling air in the blowing air heat exchange flow passage and improve the cooling effect.
Preferably, the on-duty stage throttling device comprises a first throttling device and a second throttling device which are axially distributed, the axial distance between the second throttling device and the first throttling device is larger than the axial distance between the first throttling device and the premixed spray rod, the axial distance between the on-duty stage fuel spray hole and the second throttling device is larger than the axial distance between the second throttling device and the first throttling device, the fuel pressure of the on-duty stage fuel flow passage sequentially changes in the axial direction of the on-duty stage fuel flow passage according to the fuel pressure of the on-duty stage fuel flow passage, the fuel temperature of the on-duty stage fuel flow passage sequentially changes in the axial direction of the on-duty stage fuel flow passage according to the gradient change of the changing pressure and the temperature, and the throttling device is arranged to fully exert the effect of the throttling device.
The advantages of the present application include: in summary, the invention relates to a gas fuel nozzle for a low-pollution combustion chamber, which mainly solves the following technical problems:
by designing the throttling device in the nozzle, the flow coefficients of different nozzles of the nozzle are respectively controlled, the uniformity of the fuel flow of each nozzle is ensured, and the sensitivity of the nozzle to thermal deformation, fuel corrosion and slight coking and carbon deposition is reduced;
the nozzle pressure drop is increased, and the sensitivity of the nozzle fuel flow to unstable combustion in the combustion chamber is reduced;
an air drainage channel is designed in the nozzle, the introduced air exchanges heat with the on-duty fuel in the nozzle, the temperature of the on-duty fuel is improved, the stable combustion effect of the on-duty fuel is enhanced, and the combustion stability is improved;
an air drainage channel is designed in the nozzle, the temperature of air is reduced after the air is cooled by fuel, the blowing and cooling effect on the end face of the nozzle is enhanced, and the problem of overheating of the end face of the nozzle is solved.
An air drainage channel is designed in the nozzle, the volume of the flow channel cavity can be controlled according to a throttle plate, and the natural frequency of the flow channel cavity is coupled with a certain characteristic frequency of the combustion chamber, so that the oscillation combustion under the frequency can be restrained.
The invention has simple structure, can directionally and strategically solve the problems of uniform distribution, unstable combustion, nozzle heat protection and the like of fuel, and meets engineering requirements.
Drawings
FIG. 1 is a schematic illustration of a gas fuel nozzle;
FIG. 2 is a cross-sectional view of A-A of a gas fuel nozzle;
FIG. 3 is a B-B cross-sectional view of a gas fuel nozzle;
FIG. 4 is a C-C cross-sectional view of a gas fuel nozzle.
Wherein, 1-the fuel inlet interface; 2-mounting edges; 3-blowing an air inlet; 4-premixing spray bars; 5-a nozzle housing; 6-blowing an air flow passage; 7-total throttle device; 8-a premix stage throttling device; 9-premixing stage fuel injection holes; 10-on-duty throttle device; 11-a blocking device; 12-heat exchange ribs; 13-blowing an air jet; 14-duty grade fuel injection holes; 15-fuel distribution channels; 16-premix stage fuel flow passage; 17-duty grade fuel flow passage; 18-blowing air heat exchange flow passage and 19-inner plug body.
Detailed Description
For the purposes, technical solutions and advantages of the present application, the following describes the technical solutions in the embodiments of the present application in more detail with reference to the drawings in the embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application. All other embodiments, based on the embodiments herein, which would be apparent to one of ordinary skill in the art without undue burden are within the scope of the present application. Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
According to the scheme, the gas fuel entering the nozzle is subjected to four steps of throttling, distributing, throttling and injecting, the flow coefficient of the nozzle is reduced and controlled by arranging the throttling device, the influence of the aperture size of the nozzle orifice on the fuel flow is weakened, the uniformity of fuel flow distribution among different nozzles and among different injection holes of the nozzle is ensured, meanwhile, the pressure drop of the nozzle is increased, the sensitivity of the fuel flow of the nozzle to pressure fluctuation in a combustion chamber is reduced, and the combustion stability is improved. Air is introduced into the nozzle, the introduced air exchanges heat with the on-duty fuel, the temperature of the on-duty fuel is improved, the stable combustion effect of the on-duty fuel is enhanced, the combustion stability is improved, the air temperature is reduced, and the blowing and cooling effect of the air on the end face of the nozzle is enhanced, so that the problem of overheating of the end face of the nozzle is solved. The important requirement is that the air-containing cavity is introduced into the interior of the nozzle, and its volume can be regulated according to the oscillating combustion of combustion chamber under a certain specific frequency, and its action is capable of absorbing specific frequency when the combustion chamber is in oscillating combustion, and inhibiting the combustion chamber from producing oscillating combustion under said frequency.
The principles, structure and embodiments of the present invention are further described below with reference to the drawings.
The structural principle of the nozzle is shown in figures 1-4:
the nozzle housing 5, the nozzle housing 5 has an inner cavity, the inner cavity has an inner plug body 19, the inner plug body 19 comprises a front end and a rear end, the rear end and the nozzle housing 5 form a blowing air heat exchange flow channel 18, and the front end and the nozzle housing 5 form a blowing air flow channel 6; the clean air flow channel 6 is communicated with a clean air heat exchange flow channel 18, and the clean air heat exchange flow channel 18 is communicated with a clean air jet orifice 13 arranged on the rear end surface of the nozzle shell 5; the purge air channel 6 is communicated with a purge air inlet 3 formed on the wall surface of the nozzle housing 5; the blowing air enters through the blowing air inlet and enters into the blowing air heat exchange flow passage 18 through the blowing air flow passage 6, so that the rear end wall surface of the inner plug body 19 is contacted with the blowing cooling air, and the cooling effect is achieved.
The front end of the inner plug body 19 is provided with a fuel distribution cavity channel 15, the rear end is provided with an on-duty fuel flow channel 17, the fuel distribution cavity channel 15 is communicated with the on-duty fuel flow channel 17, and the on-duty fuel flow channel 17 is communicated with an on-duty fuel injection hole 14 arranged on the rear end surface of the nozzle shell 5; the front end of the inner plug body 19 is provided with a radially arranged premixing spray rod 4, the premixing spray rod 4 is provided with a premixing grade fuel runner 16 communicated with a fuel distribution cavity 15, and the premixing grade fuel runner 16 is communicated with a premixing grade fuel spray hole 9 arranged at the end part of the premixing spray rod 4;
the front end of the nozzle shell 5 is connected with a mounting edge 2, and the mounting edge 2 is provided with a fuel inlet interface 1 communicated with a fuel distribution cavity channel 15;
wherein: the fuel distribution cavity 15 is provided with a total throttling device 7 positioned at the front end of the premixing grade fuel flow channel 16, the duty grade fuel flow channel 17 is provided with a duty grade throttling device 10, the total throttling device 7 is a throttling hole formed by the bulge of the inner wall of the fuel distribution cavity 15, and the throttling device 10 is a throttling hole formed by the bulge of the inner wall of the duty grade fuel flow channel 17, so that four steps of throttling, distributing, throttling and injecting are realized, namely, the fuel is subjected to the whole flow of the throttling device 7, the fuel distribution cavity 15 and the throttling device 10, and the duty grade fuel injection holes.
In some alternative embodiments, the number of the premixing spray bars 4 is multiple, the premixing spray bars 4 are uniformly distributed along the circumferential direction of the nozzle housing 5, the premixing spray bars 4 are provided with a plurality of premixing stage fuel spray holes 9, the premixing stage fuel spray holes 9 are circumferentially arranged along the premixing spray bars 4, the premixing stage fuel spray holes 9 spray fuel oil directly into the flame tube, and the premixing stage fuel spray holes 9 with multiple angles realize uniform spraying of the fuel oil.
In some alternative embodiments, the number of purge air channels 6 is plural, each purge air channel 6 being located between two adjacent premix spray bars 4.
In some alternative embodiments, the premix stage fuel flow passage 16 has orifices formed by raised inner walls, and as such, the fuel, when being ejected through the premix boom 4, is throttled-distributed-throttled by passing through the total throttle device 7 followed by the premix stage fuel flow passage 15 and finally the orifices of the premix boom 4.
In some alternative embodiments, the cross-sectional shapes of the orifice of the total throttle device 7 and the orifice of the on-duty fuel flow passage 17 include: circular, rectangular or cross-shaped.
In some alternative embodiments, the purge air heat exchange flow path 18 is an annular cavity formed by the inner wall of the nozzle housing 5 and the outer wall of the rear end of the inner plug body 19.
In some alternative embodiments, the blocking device 11 is arranged at an axial position of the purge air heat exchange flow channel 18, the blocking device 11 is an annular ring with a central hole, the central hole is sleeved on the outer wall of the rear end of the inner plug body 19, the outer edge of the blocking device 11 is in contact with the inner wall of the nozzle shell 5, the annular surface of the blocking device 11 is provided with through holes distributed in the circumferential direction, and the blocking device 11 can adjust the axial position of the regulator at the rear end of the inner plug body 19, so that the volume of the accommodating cavity of the purge air heat exchange flow channel is controllable, the natural frequency of the blocking device is coupled with a certain characteristic frequency of the combustion chamber, and the oscillating combustion at the frequency can be restrained.
In some alternative embodiments, the outer wall surface of the rear end of the inner plug body 19 is provided with heat exchange ribs 12 formed by protrusions, and the heat exchange ribs 12 can increase the contact area with the cooling air in the blowing air heat exchange flow passage 18, so that the cooling effect is improved.
In some alternative embodiments, the on-duty throttle device 10 includes a first throttle device and a second throttle device that are axially distributed, the axial distance between the second throttle device and the first throttle device is greater than the axial distance between the first throttle device and the premixed boom 4, the axial distance between the on-duty fuel injection hole 14 and the second throttle device is greater than the axial distance between the second throttle device and the first throttle device, the fuel pressure of the on-duty fuel flow passage 17 is sequentially changed in the axial direction of the on-duty fuel flow passage 17, and the fuel temperature of the on-duty fuel flow passage 17 is sequentially changed in the axial direction of the on-duty fuel flow passage 17, and the throttle device is set according to the gradient change of the change pressure and the temperature, so that the effect of the throttle device can be fully exerted.
In summary, the invention relates to a gas fuel nozzle for a low-pollution combustion chamber, which mainly solves the following technical problems:
1. by designing the throttling device in the nozzle, the flow coefficients of different nozzles of the nozzle are respectively controlled, the uniformity of the fuel flow of each nozzle is ensured, and the sensitivity of the nozzle to thermal deformation, fuel corrosion and slight coking and carbon deposition is reduced;
2. the nozzle pressure drop is increased, and the sensitivity of the nozzle fuel flow to unstable combustion in the combustion chamber is reduced;
3. an air drainage channel is designed in the nozzle, the introduced air exchanges heat with the on-duty fuel in the nozzle, the temperature of the on-duty fuel is improved, the stable combustion effect of the on-duty fuel is enhanced, and the combustion stability is improved;
4. an air drainage channel is designed in the nozzle, the temperature of air is reduced after the air is cooled by fuel, the blowing and cooling effect on the end face of the nozzle is enhanced, and the problem of overheating of the end face of the nozzle is solved.
5. An air drainage channel is designed in the nozzle, the volume of the flow channel cavity can be controlled according to a throttle plate, and the natural frequency of the flow channel cavity is coupled with a certain characteristic frequency of the combustion chamber, so that the oscillation combustion under the frequency can be restrained.
The invention has simple structure, can directionally and strategically solve the problems of uniform distribution, unstable combustion, nozzle heat protection and the like of fuel, and meets engineering requirements.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present application should be covered in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A gas fuel nozzle for a low pollution combustor, comprising:
the air blowing device comprises a nozzle shell (5), wherein the nozzle shell (5) is provided with an inner cavity, the inner cavity is provided with an inner plug body (19), the inner plug body (19) comprises a front end and a rear end, the rear end and the nozzle shell (5) form a blowing air heat exchange flow passage (18), and the front end and the nozzle shell (5) form a blowing air flow passage (6); the blowing air flow passage (6) is communicated with a blowing air heat exchange flow passage (18), and the blowing air heat exchange flow passage (18) is communicated with a blowing air jet orifice (13) arranged on the rear end surface of the nozzle shell (5); the blowing air flow passage (6) is communicated with a blowing air inlet (3) arranged on the wall surface of the nozzle shell (5);
the front end of the inner plug body (19) is provided with a fuel distribution cavity (15), the rear end is provided with an on-duty fuel flow passage (17), the fuel distribution cavity (15) is communicated with the on-duty fuel flow passage (17), and the on-duty fuel flow passage (17) is communicated with an on-duty fuel injection hole (14) arranged on the rear end face of the nozzle shell (5); the front end of the inner plug body (19) is provided with a premixing spray rod (4) which is arranged in the radial direction, the premixing spray rod (4) is provided with a premixing grade fuel runner (16) which is communicated with a fuel distribution cavity (15), and the premixing grade fuel runner (16) is communicated with a premixing grade fuel injection hole (9) which is arranged at the end part of the premixing spray rod (4);
the front end of the nozzle shell (5) is connected with a mounting edge (2), and the mounting edge (2) is provided with a fuel inlet interface (1) communicated with a fuel distribution cavity (15);
wherein: the fuel distribution cavity (15) is provided with a total throttling device (7) positioned at the front end of the premixing grade fuel flow passage (16), the duty grade fuel flow passage (17) is provided with a duty grade throttling device (10), the total throttling device (7) is an orifice formed by the bulge of the inner wall of the fuel distribution cavity (15), and the throttling device (10) is an orifice formed by the bulge of the inner wall of the duty grade fuel flow passage (17).
2. A gas fuel nozzle for a low pollution combustor according to claim 1, wherein the number of premix burner bars (4) is plural, the plurality of premix burner bars (4) being evenly distributed along the circumference of the nozzle housing (5).
3. A gas fuel nozzle for a low pollution combustion chamber according to claim 2, wherein the number of purge air channels (6) is plural, each purge air channel (6) being located between two adjacent premix burner bars (4).
4. A gas fuel nozzle for a low pollution combustor as in claim 1, wherein the premix stage fuel flow passage (16) has orifices formed by projections of the inner wall.
5. The gas fuel nozzle for a low pollution combustor according to claim 1, wherein the cross-sectional shape of the orifice of the total throttle device (7) and the orifice of the on-duty fuel flow passage (17) includes: circular, rectangular or cross-shaped.
6. A gas fuel nozzle for a low pollution combustion chamber according to claim 1, wherein the purge air heat exchanging channel (18) is an annular cavity formed by the inner wall of the nozzle housing (5) and the outer wall of the rear end of the inner plug body (19).
7. A gas fuel nozzle for a low pollution combustion chamber according to claim 6, wherein the purge air heat exchanging channel (18) has a blocking means (11) at an axial position, the blocking means (11) is an annular ring having a central hole which is fitted over the rear outer wall of the inner plug body (19), the outer edge of the blocking means (11) is in contact with the inner wall of the nozzle housing (5), and the annular surface of the blocking means (11) has a through hole.
8. A gas fuel nozzle for a low pollution combustion chamber according to claim 1, wherein the rear outer wall surface of the inner plug body (19) has heat exchanging fins (12) formed by projections.
9. A gas fuel nozzle for a low pollution combustion chamber according to claim 1, wherein the duty stage throttle means (10) comprises axially distributed first and second throttle means, the second throttle means being axially spaced from the first throttle means by a greater axial distance than the first throttle means and the premix boom (4), the duty stage fuel injection hole (14) being axially spaced from the second throttle means by a greater axial distance than the second throttle means and the first throttle means.
10. A gas fuel nozzle for a low pollution combustor according to claim 1, wherein the premix burner bar (4) has a plurality of premix stage fuel injection holes (9), the plurality of premix stage fuel injection holes (9) being arranged circumferentially along the premix burner bar (4).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210418208.XA CN114838386B (en) | 2022-04-20 | 2022-04-20 | Gas fuel nozzle for low-pollution combustion chamber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210418208.XA CN114838386B (en) | 2022-04-20 | 2022-04-20 | Gas fuel nozzle for low-pollution combustion chamber |
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| CN114838386A CN114838386A (en) | 2022-08-02 |
| CN114838386B true CN114838386B (en) | 2023-06-23 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204717744U (en) * | 2015-04-03 | 2015-10-21 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | A kind of nozzle of radial spray and be provided with the gas turbine of this nozzle |
| CN215489714U (en) * | 2021-08-26 | 2022-01-11 | 华能国际电力股份有限公司 | Fuel nozzle device with variable rotational flow number |
| CN114034061A (en) * | 2021-09-03 | 2022-02-11 | 东方电气集团科学技术研究院有限公司 | Liquid fuel nozzle for dual-fuel combustion chamber of dual-radial swirler |
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| US9822649B2 (en) * | 2008-11-12 | 2017-11-21 | General Electric Company | Integrated combustor and stage 1 nozzle in a gas turbine and method |
| US20100162711A1 (en) * | 2008-12-30 | 2010-07-01 | General Electric Compnay | Dln dual fuel primary nozzle |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204717744U (en) * | 2015-04-03 | 2015-10-21 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | A kind of nozzle of radial spray and be provided with the gas turbine of this nozzle |
| CN215489714U (en) * | 2021-08-26 | 2022-01-11 | 华能国际电力股份有限公司 | Fuel nozzle device with variable rotational flow number |
| CN114034061A (en) * | 2021-09-03 | 2022-02-11 | 东方电气集团科学技术研究院有限公司 | Liquid fuel nozzle for dual-fuel combustion chamber of dual-radial swirler |
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