CN113606608A - On-duty fuel nozzle tip, fuel nozzle and gas turbine - Google Patents
On-duty fuel nozzle tip, fuel nozzle and gas turbine Download PDFInfo
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- CN113606608A CN113606608A CN202110970405.8A CN202110970405A CN113606608A CN 113606608 A CN113606608 A CN 113606608A CN 202110970405 A CN202110970405 A CN 202110970405A CN 113606608 A CN113606608 A CN 113606608A
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- gas
- duty fuel
- premixed
- duty
- premix
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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
Abstract
The invention provides an on-duty fuel nozzle head, a fuel nozzle and a gas turbine. The on-duty fuel nozzle head provided by the invention enables the on-duty fuel and the premixed gas to be premixed in the premixing cavity to form the premixed on-duty fuel, and the premixed on-duty fuel is sprayed out of the premixed on-duty fuel spray hole. Can play the roles of stabilizing flame and reducing CO and UHC emission when the gas turbine runs at a lower load, and can play the roles of stabilizing flame and reducing NO when the gas turbine runs at a higher load or a basic loadXThereby enabling the gas turbine to meet pollutant emission requirements. The premixing gas inlet is designed to be of a composite angle structure, so that the premixing gas entering the premixing cavity through the premixing gas inlet can be promoted to be mixed with the on-duty fuel.
Description
Technical Field
The invention relates to the technical field of gas turbines, in particular to a duty fuel nozzle head, a fuel nozzle and a gas turbine.
Background
The gas turbine is a heat engine which takes continuously flowing gas as a working medium to drive an impeller to rotate at a high speed and converts fuel heat energy into mechanical work. At present, at the followingDue to the gradual improvement of environmental protection standards, the limit on the pollutant emission of the gas turbine is more and more strict. In order to reduce Nitrogen Oxides (NO)X) And the emission of pollutants is the same, and the lean premixed combustion technology is mostly adopted in the existing mainstream heavy-duty gas turbine. Premixed combustion, i.e. where fuel and air are premixed prior to combustion, lean premixed combustion having the advantage of NOXThe emission is low, but at part load of the combustion engine, due to high airflow speed of the premixing channel, the equivalent ratio is low, the combustion temperature is low, the flame stability is poor, and the problem of thermoacoustic oscillation is brought, so that the service life of parts is influenced. It is conventional to arrange an on-duty nozzle head on the nozzle that injects the on-duty fuel to form the diffusion flame or partially premixed flame. Diffusion flame stability is good, but diffusion flame combustion temperatures are high, heat release is concentrated, large amounts of CO and UHC (unburned hydrocarbons) are produced at low load operation, and NO is produced at base load or higher load operation of the gas turbineXThe discharge is high.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, embodiments of the present invention propose a fuel nozzle tip for duty fuel such that NOXReduced CO and UHC emissions, flame stabilization.
The embodiment of the invention also provides NOXLow CO and UHC emissions, flame stable fuel nozzles, and gas turbines including such fuel nozzles.
An on-duty fuel nozzle tip according to an embodiment of the present invention includes: the outer shell is sleeved on the inner shell, an on-duty fuel circulation cavity and a premixing cavity are defined in the inner shell, the premixing cavity is communicated with the on-duty fuel circulation cavity, a premixing gas circulation cavity is defined between the outer shell and the inner shell, a plurality of premixing gas inlets penetrating through the circumferential wall are formed in the circumferential wall of the inner shell, the premixing gas inlets are located between the premixing gas circulation cavity and the premixing cavity, an included angle is formed between the central axis of each premixing gas inlet and the radial direction of the inner shell, and the central axis of each premixing gas inlet deflects along the circumferential direction of the inner shell to form a deflection angle; the spray head is connected with the front end of each of the outer shell and the inner shell, and a plurality of premixed on-duty fuel spray holes communicated with the premixed cavity and a plurality of first premixed gas spray holes communicated with the premixed gas circulation cavity are formed in the spray head.
According to the on-duty fuel nozzle head provided by the embodiment of the invention, the on-duty fuel and the premixed gas are premixed in the premixing cavity to form the premixed on-duty fuel, and the premixed on-duty fuel is sprayed out of the premixed on-duty fuel spray hole. When the gas turbine runs at a lower load, the effects of stabilizing flame and reducing CO and UHC emissions can be achieved; can stabilize flame and reduce NO at higher load or basic load of the gas turbineXThereby enabling the gas turbine to meet pollutant emission requirements. In addition, the size of the premixed gas inlet can be changed to adjust the ratio of the on-duty fuel and the premixed air, so that better flame stability and lower pollutant discharge amount are obtained. The premixing of the on-duty fuel and the premixed gas before the ejection can also adjust the thermo-acoustic oscillation characteristic of the combustion chamber.
The premixing gas inlet is designed to be of a composite angle structure, so that the premixing gas entering the premixing cavity through the premixing gas inlet can be promoted to be mixed with the on-duty fuel. The uniformly mixed premixed fuel on duty is beneficial to further improving the performance of the fuel nozzle and reducing the emission of pollutants.
In addition, when the on-duty fuel stops supplying, the premixed gas can be continuously supplied and sprayed out from the premixed on-duty fuel spray hole, and the premixed gas can serve as a blowing air cleaning function, so that the problems that after the on-duty fuel supply is stopped, high-temperature hot gas flows back into the premixed on-duty fuel spray hole, a nozzle head is burnt, and safety problems are caused can be avoided.
Thus, a gas turbine engine including an on-duty fuel nozzle tip provided by embodiments of the present invention has NOXLow emission, low CO and UHC emission and stable flame.
In some embodiments, the plurality of premix gas inlets are arranged in a plurality of rows, each row of premix gas inlets includes a plurality of premix gas inlets, the plurality of premix gas inlets are spaced apart along a circumferential direction of the inner casing, and the plurality of rows of premix gas inlets are spaced apart along an axial direction of the inner casing.
In some embodiments, the plurality of premix gas inlets in each row of premix gas inlets are arranged in a rotational symmetry with the central axis of the inner shell as a rotational symmetry center line.
In some embodiments, the deflection directions of the premix gas inlets in adjacent rows of premix gas inlets are opposite.
In some embodiments, the premixing chamber is located downstream of the on-duty fuel circulation chamber, a baffle plate is arranged in the inner shell to separate the premixing chamber from the on-duty fuel circulation chamber, and an on-duty fuel inlet communicated with the on-duty fuel circulation chamber and the premixing chamber is arranged on the baffle plate.
In some embodiments, an axial direction of the on-duty fuel inlet and an axial direction of the inner casing have an included angle therebetween, and a central axis of the on-duty fuel inlet is deflected with a deflection angle in a circumferential direction of the inner casing.
In some embodiments, the shift fuel inlet is a plurality of shift fuel inlets, the shift fuel inlets are arranged at intervals along the circumferential direction of the inner shell, and the shift fuel inlets are arranged in a rotational symmetry manner with the central axis of the inner shell as a rotational symmetry center line.
In some embodiments, a premix gas inner cavity is further defined in the inner shell, the premix gas inner cavity is communicated with the premix gas circulation cavity, a second premix gas injection hole communicated with the premix gas inner cavity is formed in the nozzle, and the plurality of premix on-duty fuel injection holes are distributed around the second premix gas injection hole.
In some embodiments, the on-duty fuel nozzle head further includes an inner chamber cylinder and a communicating pipe, the inner chamber cylinder defines the premixed gas inner chamber, the front end of the inner chamber cylinder is connected to the nozzle, the premixing chamber is defined between the outer peripheral wall of the inner chamber cylinder and the inner peripheral wall of the inner housing, the communicating pipe is located between the outer peripheral wall of the inner chamber cylinder and the inner peripheral wall of the inner housing and connected to each of the outer peripheral wall and the inner peripheral wall of the inner housing, the inner end of the communicating pipe is communicated with the premixed gas inner chamber, and the outer end of the communicating pipe is communicated with the premixed gas circulation chamber.
In some embodiments, the second premixed gas injection holes are a plurality of holes, and the plurality of second premixed gas injection holes are radially arranged by taking the central axis of the inner shell as a central line.
In some embodiments, the spraying direction of the premixing on-duty fuel spray holes faces forwards and outwards, and the premixing on-duty fuel spray holes are radially arranged by taking the central axis of the inner shell as a central line.
According to another embodiment of the present invention, a fuel nozzle is provided, comprising: an on-duty fuel nozzle tip according to any of the embodiments described above; an on-duty fuel inlet passage in communication with the on-duty fuel flow-through cavity; a premix gas inlet passage in communication with the premix gas flowthrough chamber.
In some embodiments, the method comprises: the on-duty fuel input pipe limits the on-duty fuel input channel and is connected with the inner shell; the premixed gas input pipe is sleeved on the on-duty fuel input pipe and forms a premixed gas input channel with the on-duty fuel input pipe, and the premixed gas input pipe is connected with the shell; and the main fuel input pipe is sleeved on the premixed gas input pipe and forms a main fuel channel with the premixed gas input pipe.
According to another aspect of the present invention, a gas turbine is provided, comprising: a fuel nozzle that is the fuel nozzle proposed according to the above embodiment of the present invention; and the combustion pressure cylinder is communicated with the premixed gas input channel.
The gas turbine provided by the embodiment of the invention has NOXLow emission, low CO and UHC emission and stable flame.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic illustration of a shift fuel nozzle tip according to an embodiment of the present invention.
Fig. 2 is a front view of a fuel nozzle tip on duty according to an embodiment of the present invention.
Fig. 3 is a cross-sectional view of a fuel nozzle tip on duty according to an embodiment of the present invention.
Fig. 4 is a schematic view of an inner shell according to an embodiment of the invention.
FIG. 5 is a side view of an inner shell according to an embodiment of the present invention.
Fig. 6 is a cross-sectional view of an inner shell according to an embodiment of the invention.
Reference numerals:
on duty fuel nozzle head 1
A casing 11, a premixed gas circulation chamber 111,
A nozzle 13, a premixed on-duty fuel nozzle 131, a first premixed gas nozzle 132, a second premixed gas nozzle 133,
A baffle plate 14, a duty fuel inlet 141,
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A fuel nozzle and a duty fuel nozzle head 1 of an embodiment of the invention are described below with reference to fig. 1-6. The fuel nozzle includes an on-duty fuel nozzle head 1, an on-duty fuel inlet passage, and a premix gas inlet passage. As shown in fig. 1, the on-duty fuel nozzle head 1 includes an outer casing 11, an inner casing 12, and a head 13.
The outer casing 11 is sleeved on the inner casing 12, and the inner casing 12 defines an on-duty fuel circulation chamber 121 and a premixing chamber 122. Premix chamber 122 is in communication with on-duty fuel flow through chamber 121. The on-duty fuel flow through cavity 121 is communicated with an on-duty fuel input channel, on-duty fuel in the on-duty fuel input channel is input into the on-duty fuel flow through cavity 121, and on-duty fuel in the on-duty fuel flow through cavity 121 enters the premixing cavity 122 communicated with the on-duty fuel flow through cavity.
A premix gas circulation chamber 111 is defined between the outer casing 11 and the inner casing 12, and a premix gas inlet passage communicates with the premix gas circulation chamber 111. The inner casing 12 has a plurality of premixed gas inlets 123 formed on the circumferential wall thereof, and the premixed gas inlets 123 are formed between the premixed gas flowing chamber 111 and the premixing chamber 121. And, the premix gas inlet 123 communicates with each of the premix gas flow chamber 111 and the premix chamber 121. The premixed gas in the premixed gas input passage is input into the premixed gas circulation chamber 111, the premixed gas in the premixed gas circulation chamber 111 enters the premixing chamber 122 through the premixed gas inlet 123, and the premixed gas is mixed with the fuel on duty in the premixing chamber 122. Optionally, the premixed gas is air.
The nozzle 13 is connected to a front end of each of the outer and inner casings 11 and 12, and the nozzle 13 is provided with a plurality of premixed on-duty fuel injection holes 131 communicating with the premixed chamber 122 and a plurality of first premixed gas injection holes 132 communicating with the premixed gas circulation chamber 111. The premixed on duty fuel in the premixing chamber 122 is injected through the premixed on duty fuel injection hole 131, and the premixed gas in the premixed gas circulation chamber 111 is injected through the first premixed gas injection hole 132 and mixed with the premixed on duty fuel in front of the shower head 13.
Wherein, an included angle is formed between the axial direction of the premixed gas inlet 123 and the radial direction of the inner casing 12, and the central axis of the premixed gas inlet 123 is deflected along the circumferential direction of the inner casing 12 to have a deflection angle. Alternatively, premix gas inlet 123 is a compound angle configuration, such that the premix gas entering premix chamber 121 through premix gas inlet 123 is mixed with the on-duty fuel.
According to the fuel nozzle provided by the embodiment of the invention, the on-duty fuel and the premixed gas are premixed in the premixing cavity to form the premixed on-duty fuel, and the premixed on-duty fuel is sprayed out from the premixed on-duty fuel spray holes. At lower load operation of the gas turbine, the energy consumption can be reducedCan play the roles of stabilizing flame and reducing CO and UHC emission, and can play the roles of stabilizing flame and reducing NO when the gas turbine has higher load or basic loadXThereby enabling the gas turbine to meet pollutant emission requirements. In addition, the size of the premixed gas inlet can be changed to adjust the ratio of the on-duty fuel and the premixed air, so that better flame stability and lower pollutant discharge amount are obtained. The premixing of the on-duty fuel and the premixed gas before the ejection can also adjust the thermo-acoustic oscillation characteristic of the combustion chamber.
The premixing gas inlet is designed to be of a composite angle structure, so that the premixing gas entering the premixing cavity through the premixing gas inlet can be promoted to be mixed with the on-duty fuel. The uniformly mixed premixed fuel on duty is beneficial to further improving the performance of the fuel nozzle and reducing the emission of pollutants.
In addition, when the on-duty fuel stops supplying, the premixed gas can be continuously supplied and sprayed out from the premixed on-duty fuel spray hole, and the premixed gas can serve as a function of blowing air, so that the problems that after the on-duty fuel supply is stopped, high-temperature hot gas is blown back into the premixed on-duty fuel spray hole, a nozzle head is burnt, and safety problems are caused can be avoided.
Thus, a gas turbine engine including a fuel nozzle provided by embodiments of the present invention has NOXLow emission, low CO and UHC emission and stable flame.
Specific embodiments of the present invention are further described below with reference to fig. 1-6. For convenience of description, the technical solution of the present application will be described by taking as an example that the axial direction of the on-duty fuel nozzle head 1 extends in the front-rear direction. Wherein the ejection direction of the fuel and the premixed gas is a forward direction. The axial direction of the fuel nozzle head 1, the axial direction of the inner casing 12, and the axial center line of the outer casing 11 coincide. Also, in the embodiment shown in fig. 3, the outer shell 11 is arranged coaxially with the inner shell 12.
Alternatively, the outer shell 11, the inner shell 12 and the spray head 13 are integrally formed. Alternatively, in the present embodiment, as shown in fig. 1 and 4, the outer shell 11 and the inner shell 12 are provided separately. The spray head 13 is divided into two parts, one part being connected to the outer shell 11 and the other part being connected to the inner shell 12. The outer casing 11 is fitted over the inner casing 12, and a portion of the spray head 13 connected to the outer casing 11 is aligned with another portion of the spray head 13 connected to the inner casing 12.
The plurality of premixed gas inlets 123 are arranged in a plurality of rows, each row of premixed gas inlets includes a plurality of premixed gas inlets 123, the plurality of premixed gas inlets 123 are arranged at intervals along the circumferential direction of the inner casing 12, and the plurality of rows of premixed gas inlets are arranged at intervals along the axial direction of the inner casing 12.
As an example, as shown in fig. 5 and 6, in the present embodiment, the premixed gas inlets 123 are arranged in two rows, and the two rows of the premixed gas inlets 123 are arranged at intervals in the front-rear direction. The plurality of premixed gas inlets 123 in each row of premixed gas inlets 123 are rotationally symmetrically arranged with the central axis of the inner casing 12 as a rotational center line. That is, the included angles between the several premix gas inlets 123 of each row of premix gas inlets 123 and the radial direction of the inner casing 12 are the same, and the deflection direction and the angle of the deflection in the circumferential direction of the inner casing 12 are the same. Therefore, the premixed gas entering the premixing chamber 122 from the same row of the premixed gas inlet 123 can form a certain swirling flow in the premixing chamber 122, so that the premixed gas can be mixed with the on-duty fuel in the premixing chamber 122 more rapidly and uniformly.
Optionally, the premix gas inlet 123 is angled between 20 ° and 70 ° from the radial direction of the inner shell 12. The premix gas inlets 123 are deflected by an angle of 20-70 in the circumferential direction of the inner casing 12. The premix gas inlets 123 are deflected in the circumferential direction of the inner casing 12, which may be either counterclockwise or clockwise.
Further, the deflection directions of the premix gas inlets 123 in adjacent rows of premix gas inlets 123 are opposite. As shown in fig. 5 and 6, in the present embodiment, the deflection directions of the premixed gas inlets 123 of the two rows of the premixed gas inlets 123 are opposite.
Specifically, the ejection direction of the row of premixed gas inlets 123 located rearward is directed inward and forward, and the ejection direction of the row of premixed gas inlets 123 located forward is directed inward and rearward. Taking the front-to-back view as a front view, the row of premixed gas inlets 123 located at the back deflects by a certain angle in the counterclockwise direction, and the row of premixed gas inlets 123 located at the front deflects by a certain angle in the clockwise direction.
As shown in fig. 3 and 6, the premixing chamber 122 is located downstream of the on-duty fuel flow-through chamber 121, the baffle plate 14 is disposed in the inner casing 12 to separate the premixing chamber 122 from the on-duty fuel flow-through chamber 121, and the baffle plate 14 is provided with an on-duty fuel inlet 141 communicating the on-duty fuel flow-through chamber 121 and the premixing chamber 122. The on-duty fuel in on-duty fuel flow-through chamber 121 advances into premix chamber 122 from on-duty fuel inlet 141. In the present embodiment, the on-duty fuel inlet 141 includes a plurality of the on-duty fuel inlets 141, and the plurality of the on-duty fuel inlets 141 are arranged at intervals in the circumferential direction of the on-duty fuel nozzle head 1.
In some embodiments, to facilitate mixing of the on-duty fuel with the premix gas. The central axis of the on-duty fuel inlet 141 has an angle with the axial direction of the inner casing 12, and the central axis of the on-duty fuel inlet 141 is deflected in the circumferential direction of the inner casing 12 to have a deflection angle. That is, the on-duty fuel inlet 141 is also a compound-angle structure.
Alternatively, the plurality of on-duty fuel inlets 141 are arranged in rotational symmetry with the central axis of the inner shell 12 as a rotational center line, thereby improving the structural rationality of the on-duty fuel nozzle head 1 and more uniformly mixing the on-duty fuel with the premixed gas. The on-duty fuel enters the premixing cavity 122 from the on-duty fuel inlet 141, forms a rotational flow in the premixing cavity 122, and is rapidly and uniformly mixed with the premixed gas.
Further, the on-duty fuel nozzle head 1 further includes an inner chamber tube 151 and a communicating tube 152 provided in the inner casing 12, and the inner chamber tube 151 defines a premixed gas inner chamber 153 therein. The front end of the inner chamber tube 151 is connected to the nozzle 13, a premix chamber 122 is defined between the outer circumferential wall of the inner chamber tube 151 and the inner circumferential wall of the inner casing 12, a communication pipe 152 is located between the outer circumferential wall of the inner chamber tube 151 and the inner circumferential wall of the inner casing 12, and the communication pipe 152 is connected to each of the outer circumferential wall of the inner chamber tube 151 and the inner circumferential wall of the inner casing 12, the inner end of the communication pipe 152 is communicated with the premix gas inner chamber 153, and the outer end of the communication pipe 152 is communicated with the premix gas circulation chamber 111. The nozzle 13 is provided with a second premixed gas nozzle 133 communicated with the premixed gas cavity 153, and the plurality of premixed on-duty fuel nozzles 131 are distributed around the second premixed gas nozzle 133.
The premixed gas in the premixed gas circulation chamber 111 enters the premixed gas inner chamber 153 through the communicating pipe 152 and is injected through the second premixed gas injection holes 133. The premix gas cavity 153 and the second premix gas injection holes 133 are provided because the premix on-duty fuel injection holes 131 have a large size and may have a high temperature inside the plurality of premix on-duty fuel injection holes 131, and the premix gas is injected from the second premix gas injection holes 133 into the combustion chamber to cool the showerhead 13. In addition, the second premixed gas injection holes 133 may further disperse the injected premixed on-duty fuel, so that the premixed on-duty fuel may be injected dispersedly, thereby better dispersing the heat release at the nozzle 13, reducing the temperature at the nozzle 13, reducing the generation of pollutants, and making the flame more stable. Moreover, because the air ejected from the second premixed gas ejection holes 133 has momentum, the premixed gas ejected from the second premixed gas ejection holes 133 and the premixed on-duty fuel can be better mixed at the downstream, so that the mixing of the premixed on-duty fuel and the air is delayed, the temperature near the nozzle 13 is reduced, and the backfire can be prevented.
Optionally, the communication pipes 152 extend in the radial direction of the inner casing 12, and the communication pipes 152 include a plurality of communication pipes 152 arranged at intervals in the circumferential direction of the inner casing 12.
As shown in fig. 2 and 5, the plurality of second premixed gas injection holes 133 are radially arranged with the central axis of the inner casing 12 as the center line, so that the premixed gas injected from the second premixed gas injection holes 133 is radially formed, thereby enabling better cooling.
Further, the spraying direction of the premixed on-duty fuel spray holes 131 faces forward and outwards, and the plurality of premixed on-duty fuel spray holes 131 are radially arranged with the central axis of the inner casing 12 as a central axis, that is, a certain angle is formed between the spraying direction of the premixed on-duty fuel spray holes 131 and the central axis of the inner casing 12. The term "forward-outward" means that the premixed on-duty fuel injection holes 131 are inclined in a direction away from the central axis of the on-duty fuel nozzle head 1 while extending forward, so that the plurality of premixed on-duty fuel injection holes 131 form a radial structure, and the premixed on-duty fuel injected from the premixed on-duty fuel injection holes 131 is radial.
Furthermore, the premixing on-duty fuel nozzle hole 131 may also have a compound angle structure, that is, a certain angle is formed between the ejection direction of the premixing on-duty fuel nozzle hole 131 and the central axis of the inner casing 12, and the central axis of the premixing on-duty fuel nozzle hole 131 is deflected along the circumferential direction of the inner casing 12 to have a deflection angle, the deflection direction may be counterclockwise or clockwise, and preferably, the plurality of premixing on-duty fuel nozzle holes 131 are rotationally symmetric about the central axis of the inner casing 12.
So set up and make the fuel on duty can realize the dispersion injection to avoid under the fuel on duty concentrated injection's the condition, the fuel diffusion velocity that leads to is slow, and near nozzle equivalence ratio is high, diffusion flame fuel temperature is high, and heat release is comparatively concentrated, thereby leads to NOXThe discharge amount of (b) is high. When the gas turbine runs at a lower load, the flame stabilizer can further stabilize flame and reduce CO and UHC emission, and when the gas turbine runs at a higher load or a basic load, the flame stabilizer can further stabilize flame, disperse heat release and reduce NOXThe emission amount of the gas turbine, so that the gas turbine can better meet the emission requirement of pollutants.
Alternatively, the jets of the plurality of premixed on-duty fuel orifices 131 may be fired into the swirl shear layer of the fuel nozzle.
Preferably, the plurality of premixed on-duty fuel injection holes 131 are arranged at equal intervals, so that the design of the nozzle 13 is more reasonable, and the premixed on-duty fuel is injected more uniformly. The jet flow of the fuel on duty can be more uniformly injected into the rotational flow shear layer of the fuel nozzle, so that the flame of the gas turbine running under low load is more stable, the discharge amount of CO and UHC is reduced, the gas turbine running under high load realizes better heat dispersion release, and NO is reducedXThe amount of discharge of (c).
As shown in fig. 2, the second premixed gas injection holes 133, the premixed on-duty fuel injection holes 131, and the first premixed gas injection holes 132 of the head 13 are sequentially arranged from the inside to the outside. Further, the plurality of first premix gas orifices 132 are evenly disposed about the plurality of premix on-duty fuel orifices 131.
The fuel nozzle also includes an on-duty fuel inlet tube, a premix gas inlet tube, and a main fuel inlet tube. The on-duty fuel inlet pipe defines an on-duty fuel inlet passage and is connected to the inner shell 12. The premixed gas input pipe is sleeved on the on-duty fuel input pipe and forms a premixed gas input channel with the on-duty fuel input pipe, and the premixed gas input pipe is connected with the shell 11. The main fuel input pipe is sleeved on the premixed gas input pipe and forms a main fuel channel with the premixed gas input pipe.
In other embodiments, the on-duty fuel inlet, the premix gas inlet, and the main fuel inlet may be arranged in other ways.
Preferably, the premixed gas introduced into the premixed gas input pipe is high-pressure gas, the on-duty fuel is diluted by the high-pressure premixed gas, the injection speed and the injection momentum of the premixed on-duty fuel at the premixed on-duty fuel injection hole 131 are increased, the flame surface moves downstream, the temperature at the front end (namely, the nozzle 13) of the on-duty fuel nozzle head 1 is reduced even if the flame surface is far away from the nozzle 13, and the anti-backfire function is realized.
Optionally, the premixed gas is air, nitrogen or other inert gas, such as helium, etc. Alternatively, a path of high pressure air is led out from the combustion cylinder as the premixed gas, that is, a path of high pressure air in the combustion cylinder is led into the premixed gas input pipe, the high pressure air flows to the on-duty fuel nozzle head along the premixed gas input channel and enters the premixing cavity 122, and the high pressure air entering the premixing cavity 122 is mixed with the on-duty fuel to form the premixed on-duty fuel. Optionally, the pressure and flow of high pressure air into the premix gas inlet line is adjustable.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (14)
1. A duty fuel nozzle tip, comprising:
the outer shell is sleeved on the inner shell, an on-duty fuel circulation cavity and a premixing cavity are defined in the inner shell, the premixing cavity is communicated with the on-duty fuel circulation cavity, a premixing gas circulation cavity is defined between the outer shell and the inner shell, a plurality of premixing gas inlets penetrating through the circumferential wall are formed in the circumferential wall of the inner shell, the premixing gas inlets are located between the premixing gas circulation cavity and the premixing cavity, an included angle is formed between the central axis of each premixing gas inlet and the radial direction of the inner shell, and the central axis of each premixing gas inlet deflects along the circumferential direction of the inner shell to form a deflection angle;
the spray head is connected with the front end of each of the outer shell and the inner shell, and a plurality of premixed on-duty fuel spray holes communicated with the premixed cavity and a plurality of first premixed gas spray holes communicated with the premixed gas circulation cavity are formed in the spray head.
2. The on-duty fuel nozzle head of claim 1, wherein said plurality of premix gas inlets are arranged in a plurality of rows, each row of premix gas inlets comprising a plurality of said premix gas inlets, said plurality of premix gas inlets being spaced circumferentially about said inner shell, said plurality of rows of premix gas inlets being spaced axially about said inner shell.
3. The on-duty fuel nozzle head of claim 2, wherein the plurality of premix gas inlets in each row of premix gas inlets are rotationally symmetric about the central axis of the inner shell as a rotational center line.
4. The on-duty fuel nozzle tip of claim 2 or 3, wherein the premix gas inlets of adjacent rows of premix gas inlets are deflected in opposite directions both axially and circumferentially.
5. The on-duty fuel nozzle head of claim 1, wherein said premix chamber is located downstream of said on-duty fuel recirculation chamber, a baffle plate is disposed within said inner housing and separates said premix chamber from said on-duty fuel recirculation chamber, and an on-duty fuel inlet is disposed in said baffle plate and communicates said on-duty fuel recirculation chamber with said premix chamber.
6. The duty fuel nozzle head of claim 5, wherein an axial direction of said duty fuel inlet is angled from an axial direction of said inner housing, and a central axis of said duty fuel inlet is angled with a yaw angle along a circumferential direction of said inner housing.
7. The on-duty fuel nozzle head of claim 6, wherein said on-duty fuel inlet is a plurality of said on-duty fuel inlets spaced circumferentially about said inner housing, said plurality of said on-duty fuel inlets being rotationally symmetric about said central axis of said inner housing.
8. The on-duty fuel nozzle tip of claim 1 or 5, further defining a premix gas plenum within said inner shell, said premix gas plenum communicating with said premix gas recirculation chamber, said nozzle tip having a second premix gas orifice communicating with said premix gas plenum, said plurality of premix on-duty fuel orifices being distributed about said second premix gas orifice.
9. The fuel nozzle head on duty of claim 8, further comprising an inner chamber barrel and a communicating tube disposed inside said inner housing, said inner chamber barrel defining said premixed gas chamber therein, said inner chamber barrel being connected at a front end thereof to said showerhead, said outer peripheral wall of said inner chamber barrel and said inner peripheral wall of said inner housing defining said premixed chamber therebetween, said communicating tube being disposed between said outer peripheral wall of said inner chamber barrel and said inner peripheral wall of said inner housing, said communicating tube having an inner end communicating with said premixed gas chamber and an outer end communicating with said premixed gas flow chamber.
10. The on-duty fuel nozzle tip of claim 8, wherein the second premix gas orifices are a plurality of the second premix gas orifices arranged radially about a central axis of the inner shell.
11. The on-duty fuel nozzle head of claim 1 or 10, wherein the premixed on-duty fuel nozzle orifices are directed forwardly and outwardly, and the plurality of premixed on-duty fuel nozzle orifices are radially arranged with the central axis of the inner casing as a centerline.
12. A fuel nozzle, comprising:
an on-duty fuel nozzle tip, the on-duty fuel nozzle tip being an on-duty fuel nozzle tip as claimed in any one of claims 1-11;
an on-duty fuel inlet passage in communication with the on-duty fuel flow-through cavity;
a premix gas inlet passage in communication with the premix gas flowthrough chamber.
13. The fuel nozzle of claim 12, comprising:
the on-duty fuel input pipe limits the on-duty fuel input channel and is connected with the inner shell;
the premixed gas input pipe is sleeved on the on-duty fuel input pipe and forms a premixed gas input channel with the on-duty fuel input pipe, and the premixed gas input pipe is connected with the shell; and
and the main fuel input pipe is sleeved on the premixed gas input pipe and forms a main fuel channel with the premixed gas input pipe.
14. A gas turbine engine comprising a fuel nozzle according to claim 12 or 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110970405.8A CN113606608B (en) | 2021-08-23 | 2021-08-23 | On-duty fuel nozzle tip, fuel nozzle and gas turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110970405.8A CN113606608B (en) | 2021-08-23 | 2021-08-23 | On-duty fuel nozzle tip, fuel nozzle and gas turbine |
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| Publication Number | Publication Date |
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| CN113606608A true CN113606608A (en) | 2021-11-05 |
| CN113606608B CN113606608B (en) | 2023-03-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110970405.8A Active CN113606608B (en) | 2021-08-23 | 2021-08-23 | On-duty fuel nozzle tip, fuel nozzle and gas turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115200044B (en) * | 2022-07-01 | 2024-05-14 | 江苏大学 | Fuel wall surface injection jet hole structure of scramjet engine |
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| CN113137632A (en) * | 2021-05-13 | 2021-07-20 | 中国联合重型燃气轮机技术有限公司 | Premixing type on-duty fuel nozzle head, fuel nozzle and gas turbine |
| CN113137633A (en) * | 2021-05-13 | 2021-07-20 | 中国联合重型燃气轮机技术有限公司 | Gas turbine and nozzle for combustion chamber thereof |
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| US20090173075A1 (en) * | 2007-11-29 | 2009-07-09 | Keisuke Miura | Burner and gas turbine combustor |
| CA2693042A1 (en) * | 2009-03-26 | 2010-09-26 | Hitachi, Ltd. | Burner, combustor and remodeling method for burner |
| CN104180397A (en) * | 2014-07-25 | 2014-12-03 | 北京华清燃气轮机与煤气化联合循环工程技术有限公司 | Pre-mixing on-duty nozzle |
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| Publication number | Publication date |
|---|---|
| CN113606608B (en) | 2023-03-10 |
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