CN115854385A - Combustor head structure capable of adjusting nozzle position - Google Patents
Combustor head structure capable of adjusting nozzle position Download PDFInfo
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- CN115854385A CN115854385A CN202310007613.7A CN202310007613A CN115854385A CN 115854385 A CN115854385 A CN 115854385A CN 202310007613 A CN202310007613 A CN 202310007613A CN 115854385 A CN115854385 A CN 115854385A
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- fuel
- swirler
- fuel oil
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- venturi
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Abstract
The invention discloses a combustion chamber head structure capable of adjusting the position of a nozzle, which comprises: the fuel oil channel sequentially comprises a fuel oil channel inlet channel, a fuel oil detention cavity and a nozzle mounting thread; the fuel way inlet channel is positioned in the center of the wall of the fuel retention cavity; the fuel oil detention cavity is connected behind the fuel oil way inlet channel; the nozzle mounting thread is positioned at the outlet end of the fuel oil retention cavity; the hexagonal knob is positioned at the fuel inflow end of the fuel channel; the limiting thread is positioned between the outer wall surface of the fuel oil channel and the inner ring wall surface of the swirler; the venturi tube swirler module is nested with the outer wall of the fuel oil detention cavity and comprises a swirler and a venturi tube, wherein the swirler and the venturi tube are arranged around the outer wall of the fuel oil passage, and the venturi tube is coaxially nested outside the swirler. The technical scheme of the invention can effectively improve the quality of fuel oil crushing and atomizing and the rapid mixing with the oxidant, and overcome the problems of difficult ignition and poor combustion stability under partial working conditions.
Description
Technical Field
The invention belongs to the technical field of industrial gas turbines, and particularly relates to a combustion chamber head structure capable of adjusting the position of a nozzle.
Background
As industrial gas turbines are continuously applied to the fields of power generation, distributed energy supply, ship power and the like, pollution caused by the industrial gas turbines is more and more concerned. Among them, since the emission of NOx causes a lot of environmental problems, the emission standards thereof are gradually increasing to meet a lot of demands. Therefore, the development of the gas turbine at present focuses more on how to effectively reach the NOx emission standard and meet the environmental protection requirement. The combustion temperature is reduced as an effective means for reducing NOx emission, and the method has the advantages of high combustion efficiency, controllable cost and the like, and has great application potential.
However, lowering the combustion temperature often causes significant problems such as poor combustion stability and difficulty in ignition after flame off. It is therefore necessary to modify or redesign the combustion chamber, wherein the head structure design is particularly critical.
The mixing of air and fuel, the crushing degree of the fuel and the air flowing structure of a reaction zone have great influence on the quick ignition and stable combustion of the fuel. In the case of greater restrictions on the optimization of the fuel injector, greater demands are made on the design of the head structure.
Disclosure of Invention
The present invention is directed to a burner head structure with adjustable nozzle position to solve the above problems as set forth in the background above.
According to an aspect of the present invention, there is provided a burner head structure with adjustable nozzle position, comprising: the fuel oil channel sequentially comprises a fuel oil channel inlet channel, a fuel oil detention cavity and a nozzle mounting thread; the fuel way inlet channel is positioned in the center of the wall of the fuel retention cavity and is used for being connected with a nozzle to inject the required liquid fuel; the fuel oil detention cavity is connected behind the fuel oil way inlet channel; the nozzle mounting thread is positioned at the outlet end of the fuel oil detention cavity and is used for mounting a fuel oil nozzle; the hexagonal knob is positioned at the fuel inflow end of the fuel channel; the limiting thread is positioned between the outer wall surface of the fuel oil channel and the inner ring wall surface of the swirler; the venturi tube swirler module is nested with the outer wall of the fuel retention cavity and comprises a swirler and a venturi tube, wherein the swirler and the venturi tube are arranged around the outer wall of the fuel passage, and the venturi tube is coaxially nested outside the swirler.
Furthermore, the limiting thread is positioned between the outer wall surface of the fuel oil channel and the inner wall surface of the swirler, the length of the thread on the outer wall surface of the fuel oil channel is about 1.5 times of that of the thread on the inner wall surface of the swirler, and the limiting thread is used for adjusting the relative position of the fuel oil injection point and the venturi structure of the swirler.
Furthermore, the hexagonal knob is located at a fuel inflow end of the fuel channel and used for rotatably adjusting the installation depth of the fuel channel, and the hexagonal diagonal distance is smaller than the diameter of the outer wall of the fuel channel.
Furthermore, the venturi is arranged at the downstream part of the cyclone, and the front section of the venturi is coaxially nested on the outer wall of the cyclone and is coaxially connected with the cyclone through a flange; the front end of the inner flow passage is internally contracted and used for increasing the air speed of the throat part to promote the fuel oil to be crushed and atomized, and the tail end of the inner flow passage is outwards expanded and used for limiting the radial expansion size of the air and simultaneously limiting the flame surface form during the reaction; the diameter of the venturi inlet is equal to the diameter of the swirler outlet, the ratio of the distance between the swirler outlet section and the venturi throat section to the diameter of the venturi throat section is greater than 0.6, and the angle between the tail end expansion section and the central axis of the venturi is 25-35 degrees.
The embodiment of the invention provides a combustion chamber head structure capable of adjusting the position of a nozzle, which provides an adjustable head matching design, effectively improves the atomization effect of fuel oil, improves the mixing quality and solves the problem of poor flame stability in a combustion chamber. The technology of the invention can be applied to low-emission gas turbine combustion chamber experiments in the fields of various ships, power generation and the like.
Drawings
The invention may be better understood by referring to the following description in conjunction with the accompanying drawings, in which like reference numerals are used throughout the figures to indicate like or similar parts. The accompanying drawings, which are incorporated in and form a part of this specification, further illustrate the function of the invention and, together with the detailed description, serve to explain the principles and advantages of the invention. Wherein:
FIG. 1 shows a left side view of a combustion chamber head structure;
FIG. 2 illustrates a front cross-sectional view of a combustor head configuration according to an embodiment of the present invention.
The fuel oil pipeline comprises 100-fuel oil pipeline channel, 101-fuel oil pipeline inlet channel, 102-fuel oil pipeline, 103-pipeline mounting thread, 104-fuel oil retention cavity, 105-fuel oil pipeline outer wall, 106-nozzle mounting thread, 107-limiting thread, 108-hexagonal knob, 200-venturi tube swirler module, 201-swirler, 202-swirler mounting flange, 203-venturi tube and 204-venturi tube flange.
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention.
The invention discloses a combustion chamber head structure capable of adjusting a nozzle position, wherein a fuel oil channel and a venturi tube swirler module are combined to form the combustion chamber head structure capable of adjusting the nozzle position, the problem of incomplete fuel oil crushing is effectively solved by the matching design of a venturi tube and a swirler, the mixing quality of fuel oil and air is effectively improved by an adjustable fuel oil nozzle mounting mode, and the problems of difficult ignition and unstable combustion are solved.
For the purpose of promoting a better understanding of the objects, features and advantages of the invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings.
In an embodiment of the present invention,base:Sub>A combustion chamber head structure with an adjustable nozzle position is provided, and fig. 1 showsbase:Sub>A left side view of the combustion chamber head structure, and fig. 2 showsbase:Sub>A front sectional view of the structurebase:Sub>A-base:Sub>A.
As shown in fig. 2, the burner head structure with adjustable nozzle position includes: the fuel oil road channel 100 comprises from inside to outside in sequence: the fuel oil path inlet channel 101 is positioned in the center of the wall of the fuel oil retention cavity and is used for being connected with a nozzle to inject the required liquid fuel oil; the fuel oil retention cavity 104 is connected behind the fuel oil way inlet channel 101 and used for stabilizing uneven spraying caused by fuel oil transportation; nozzle mounting threads 106 are provided at the outlet end of the fuel retention chamber 104 for mounting a fuel nozzle.
The burner head structure capable of adjusting the nozzle position further comprises a limiting thread 107, which is positioned between the outer wall surface of the fuel oil channel 100 and the inner ring wall surface of the swirler 201 and is used for adjusting the installation depth of the fuel oil channel 100.
In addition, the above-mentioned burner head structure with adjustable nozzle position further includes a venturi cyclone module 200, which is nested with the outer wall of the fuel stagnation chamber 104, and includes: a swirler 201 arranged around the outer wall of the fuel retention cavity 104; and the venturi 203 is nested outside the cyclone 201.
Wherein, fuel circuit inlet channel 101 includes: fuel piping 102 and mounting threads 103. The fuel pipe 102 is mounted at the fuel inlet passage 101 by mounting threads 103. Fuel is carried by the conduit and enters the fuel retention chamber 104 through the fuel inlet passage 101.
In addition, the inlet end of the fuel retention cavity 104 is connected with the fuel inlet channel 101, the limiting thread 107 is positioned between the outer wall 105 of the fuel channel and the swirler 201, and the fuel in the fuel retention cavity 104 is directly communicated with the nozzle.
As shown in fig. 2, nozzle mounting threads 106 are associated with the fuel stagnation chamber 104 for mounting of a fuel atomizing nozzle.
In addition, the burner head structure with adjustable nozzle position further comprises a hexagonal knob 108 at the inlet end (i.e. fuel inflow end) of the fuel passage 100, the hexagonal knob 108 being hollow for mounting the fuel passage 102, which can be used to rotationally adjust the screwing depth of the limit screw 107. Wherein the hexagonal diagonal distance is, for example, less than the diameter of the outer wall of the fuel passageway.
The swirler 201 is an axial flow swirler and is arranged on the outer side of the outer wall 105 of the fuel oil channel, and a limiting thread 107 is processed between the inner wall of the swirler and the outer wall 105 of the fuel oil channel, so that the position of the fuel oil channel can be conveniently adjusted. A mounting flange 202 is attached to the outer edge.
The venturi 203 is arranged at the downstream part of the swirler 201, the front end of the venturi is internally contracted and used for increasing the air speed at the throat part and promoting the good crushing and atomization of fuel oil, and the tail end of the venturi is outwards expanded and used for limiting the radial expansion size of air and limiting the flame surface form during reaction; the diameter of the venturi inlet is equal to the diameter of the swirler outlet, the ratio of the distance between the swirler outlet section and the venturi throat section to the diameter of the venturi throat section is 0.64, and the angle between the tail end expansion section and the central axis of the venturi is 25-35 degrees.
The venturi mounting flange 204 is nested outside the outer wall of the swirler 201 and corresponds to the mounting flange at the outer edge of the swirler 201.
After being sprayed out from the nozzle, the liquid fuel can be mixed with swirling air generated at the outlet end of the swirler 201 in the venturi 203, so that the mixing effect is enhanced, and the combustion is stabilized.
The invention relates to a combustion chamber head structure capable of adjusting the position of a nozzle, which can realize stable and efficient combustion of a combustion chamber of a gas turbine, and has the working principle that:
when the combustion chamber head structure with the position of the nozzle adjustable works, the relative position of the nozzle and the venturi structure of the cyclone is guaranteed to reach the preset position by adjusting the hexagonal knob. The fuel is conveyed through a fuel pipeline and enters the fuel retention cavity through a fuel path inlet channel, fuel droplets are sprayed to a venturi tube flow passage area through a nozzle under the action of pressure, swirling air generated at the outlet end of a swirler quickly breaks and atomizes the fuel droplets into smaller particles and quickly mixes the smaller particles with the smaller particles, and the smaller particles are sprayed into a combustion chamber, so that the well atomized droplets are fully mixed with the oxygen-deficient jet. When the combustion engine is ignited, the good atomization quality and the sufficient mixing can ensure quick ignition under the low-load state of the combustion engine.
After the fuel flow is gradually increased until a rated maximum working state is reached, micro droplets in the high-quality mixing jet flow are rapidly cracked and gasified under the action of a high-temperature combustion field, and a chemical reaction is generated to generate head flame for stable combustion.
While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this description, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The present invention has been disclosed in an illustrative rather than a restrictive sense, and the scope of the present invention is defined by the appended claims.
Claims (4)
1. A combustor head structure with adjustable nozzle position, comprising:
the fuel oil channel sequentially comprises a fuel oil channel inlet channel, a fuel oil detention cavity and a nozzle mounting thread; the fuel way inlet channel is positioned in the center of the wall of the fuel retention cavity and is used for being connected with a nozzle to inject the required liquid fuel; the fuel oil detention cavity is connected behind the fuel oil way inlet channel; the nozzle mounting thread is positioned at the outlet end of the fuel oil detention cavity and is used for mounting a fuel oil nozzle;
the hexagonal knob is positioned at the fuel inflow end of the fuel channel;
the limiting thread is positioned between the outer wall surface of the fuel oil channel and the inner ring wall surface of the swirler;
the venturi tube swirler module is nested with the outer wall of the fuel retention cavity and comprises a swirler and a venturi tube, wherein the swirler and the venturi tube are arranged around the outer wall of the fuel passage, and the venturi tube is coaxially nested outside the swirler.
2. The combustion chamber head structure as claimed in claim 1, wherein the limit screw is provided between an outer wall surface of the fuel passage and an inner wall surface of the swirler, and a length of the screw of the outer wall surface of the fuel passage is about 1.5 times a length of the screw of the inner wall surface of the swirler for adjusting a relative position of the fuel injection point and the venturi structure of the swirler.
3. The combustion chamber head structure of claim 1, wherein the hexagonal knob is located at a fuel inflow end of the fuel passage for rotatably adjusting an installation depth of the fuel passage, and a hexagonal diagonal distance is smaller than a diameter of an outer wall of the fuel passage.
4. The combustor head structure of any one of claims 1 to 3, wherein the venturi is at a downstream portion of the swirler, and the forward section is coaxially nested in an outer wall of the swirler and coaxially connected to the swirler by a flange; the front end of the inner flow passage is internally contracted and used for increasing the air speed of the throat part to promote the fuel oil to be crushed and atomized, and the tail end of the inner flow passage is outwards expanded and used for limiting the radial expansion size of the air and simultaneously limiting the flame surface form during the reaction; the diameter of the inlet of the venturi is equal to the diameter of the outlet of the swirler, the ratio of the distance between the cross section of the outlet of the swirler and the cross section of the throat part of the venturi to the diameter of the cross section of the throat part of the venturi is more than 0.6, and the angle between the tail end expanding section and the central axis of the venturi is 25-35 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310007613.7A CN115854385B (en) | 2023-01-04 | 2023-01-04 | Combustion chamber head structure with adjustable nozzle position |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310007613.7A CN115854385B (en) | 2023-01-04 | 2023-01-04 | Combustion chamber head structure with adjustable nozzle position |
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| CN115854385A true CN115854385A (en) | 2023-03-28 |
| CN115854385B CN115854385B (en) | 2023-07-14 |
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Citations (13)
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| GB589692A (en) * | 1945-03-27 | 1947-06-26 | Thomas Patrick Brian | Improvements in oil fuel burners |
| US5125227A (en) * | 1990-07-10 | 1992-06-30 | General Electric Company | Movable combustion system for a gas turbine |
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| CN108916911A (en) * | 2018-04-27 | 2018-11-30 | 北京航空航天大学 | A kind of pre-combustion grade uses the center classification low emission combustor head of pre- diaphragm plate structure |
| CN108916912A (en) * | 2018-05-08 | 2018-11-30 | 北京航空航天大学 | A kind of pre-combustion grade uses the low emission combustor head of cooling anti-carbon deposition structure |
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2023
- 2023-01-04 CN CN202310007613.7A patent/CN115854385B/en active Active
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| US5125227A (en) * | 1990-07-10 | 1992-06-30 | General Electric Company | Movable combustion system for a gas turbine |
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| FR2970551A1 (en) * | 2011-01-14 | 2012-07-20 | Snecma | Terminal portion for fuel injector of annular combustion chamber of e.g. turbojet of aircraft, has outer pipe for supplying fuel at end, and nose injector mounted on end of outer pipe by threaded ends that are screwed with each other |
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| CN113137636A (en) * | 2021-04-15 | 2021-07-20 | 中国航发湖南动力机械研究所 | Double-oil-way nozzle structure |
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| CN115854385B (en) | 2023-07-14 |
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