CN111189045A - Fuel oil stable superfine atomizing nozzle and atomizing method - Google Patents
Fuel oil stable superfine atomizing nozzle and atomizing method Download PDFInfo
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- CN111189045A CN111189045A CN202010055542.4A CN202010055542A CN111189045A CN 111189045 A CN111189045 A CN 111189045A CN 202010055542 A CN202010055542 A CN 202010055542A CN 111189045 A CN111189045 A CN 111189045A
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- atomizing
- atomization
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- fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/38—Nozzles; Cleaning devices therefor
Abstract
The invention belongs to the technical field of liquid fuel combustion, and discloses a fuel stable superfine atomizing nozzle and an atomizing method, wherein liquid fuel enters through a spray pipe and passes through an atomizing sheet; the atomizing sheet is made of a macroporous material which is orderly communicated in a porous material, the porosity is 50% or less, and the pore diameter of a single pore is 20 mu m or less, so that the liquid fuel is atomized; after atomization, the atomized liquid is sprayed out from the opening at the front end of the end cover. The material of the nozzle atomization sheet is atomized by the porous and macroporous materials with ordered connectivity, so that the atomization quality is improved, the particle size of atomized liquid drops is far smaller than that of a traditional machining nozzle, the superfine atomization effect is achieved, the precision machining work of the nozzle is reduced, and the operation parameters can be overcome; especially, the influence of secondary atomization parameters on the atomization effect ensures the stability of the atomization quality.
Description
Technical Field
The invention belongs to the technical field of liquid fuel combustion, and particularly relates to a stable superfine atomizing nozzle and an atomizing method for fuel oil.
Background
Currently, the closest prior art: liquid atomization is one of the important measures to ensure stable and efficient combustion of liquid fuels. Atomization is the process of breaking up the surface or column of flowing liquid by some means to form a large number of fine particles. The liquid fuel atomization mode is more in variety, and mainly comprises various traditional pressure (mechanical) atomization, medium (steam or air) atomization, various combined atomization and the like. The combustion efficiency and the energy release speed are directly influenced by the atomization effect.
For the fuel oil atomizing nozzle, no matter single-hole atomizing plate or multi-hole atomizing plate, the fuel oil atomizing nozzle is completed by adopting metal materials through machining, the fuel oil atomizing nozzle is limited by machining precision, the diameter of a spray hole of the atomizing plate is generally about 1mm at the minimum, the required machining precision is higher, the structure is also more complex, the fuel oil atomizing nozzle is formed by combining a plurality of sets of parts such as a spinning disk, an oil distributing nozzle and the like except the atomizing plate, the structure is complex, and the requirement on the machining precision is higher. In addition, the diameter of the spray holes of the atomizing plate is limited, and the normal average atomized particle diameter is only about 10-20 μm. Moreover, because the atomization effect of the existing atomization nozzle is influenced by the nozzle structure, and is influenced by more operation parameters such as pressure, temperature and air parameters during secondary atomization, once the operation parameters are changed, such as liquid flow or pressure drop suddenly, temperature drop rapidly, or air volume or air pressure drop suddenly, the atomization effect of the liquid must be influenced, the particle size of the atomized liquid drops is increased, the combustion reaction speed is reduced, and the combustion efficiency is reduced and the combustion stability is influenced. Therefore, for a conventional fuel atomizing nozzle, the atomizing effect depends on the operating parameters of the nozzle in addition to the design structure. Once the operation parameters are changed, the atomization effect is obviously changed, the atomization particle size is obviously increased, and the combustion condition is deteriorated.
The liquid is subjected to the combined action of fluid pressure and nozzle structure to form liquid drops when flowing out of the nozzle, which is called primary atomization, and the liquid is broken into smaller liquid drops under the action of air flow outside the nozzle, which belongs to secondary atomization. For a certain liquid at a certain temperature, the primary atomization characteristic is mainly influenced by the nozzle structure and the flowing pressure of the liquid, and the secondary atomization is mainly influenced by the flowing characteristic of the mixed gas flow, such as the flow speed, the rotating strength of the gas flow, the temperature of the gas flow and the like. Therefore, the actual atomization effect of the fuel is influenced by the structural parameters of the nozzle and the operating parameters of the fluid (including liquid and gas), while in the actual operation, the operating parameters are variable, and if the operating parameters are changed greatly, such as the oil pressure is reduced remarkably, or the oil speed is reduced, the air speed is reduced, and the like, the atomization quality, particularly the size of the atomization particle size, is influenced remarkably. Studies have shown that as the fuel pressure decreases, the atomized particle size increases significantly.
In summary, the problems of the prior art are as follows: the size of liquid atomized droplets of an atomizing nozzle in the prior art is easily influenced by changes of operating parameters, such as changes of pressure, flow, air parameters and the like; under extreme conditions of rapid changes in operating parameters, the stability of the atomization quality cannot be guaranteed. Meanwhile, the existing atomizing nozzle is complex in structure and high in machining precision requirement.
The difficulty of solving the technical problems is as follows:
the atomizing sheet provided by the invention is made of porous materials, and with the development of material disciplines, the use of various porous materials is gradually and widely realized, and the atomizing sheet is gradually applied to the fields of heat preservation and storage, heat storage and combustion, electric conduction and the like at present, and the production and processing of the materials are gradually mature and reliable. In addition, with the wide application, the properties of the porous material such as temperature resistance, pressure resistance, corrosion resistance and the like are gradually improved, so that the practical use of the present invention becomes possible.
The significance of solving the technical problems is as follows: the invention improves the atomization quality. Because the aperture of the atomizing sheet can be smaller, the size of the atomized liquid drops is smaller than that of the traditional atomizing mode, and superfine atomization is realized, so that the combustion efficiency can be improved, the combustion speed can be improved, the energy can be released more quickly, and the energy conversion speed is improved.
The invention has more stable atomization effect. As mentioned above, because the aperture of the atomizing plate is smaller, the dependence of the atomizing effect on the flow pressure is reduced, and simultaneously, the influence of the operation parameters or secondary atomization on the atomizing effect is also eliminated, so that the basically constant atomizing effect can be still kept under the condition that the flow pressure is reduced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a stable fuel oil superfine atomizing nozzle and an atomizing method. The material of the nozzle atomization sheet adopts an ordered and penetrable porous macroporous structure, so that the atomization quality is improved, the particle size of atomized liquid drops is far smaller than that of a traditional machining nozzle, the superfine atomization effect is achieved, the precision machining work of the nozzle is reduced, and the operation parameters can be overcome; especially, the influence of secondary atomization parameters on the atomization effect ensures the stability of the atomization quality.
The invention is realized in such a way that a fuel stable superfine atomizing nozzle atomizing method comprises the following steps:
step one, liquid fuel enters through a spray pipe and is atomized through an atomizing sheet at the front end of the spray pipe;
secondly, the atomizing sheet adopts a macroporous material which is orderly communicated in a porous material, the porosity is 50 percent or less, and the aperture of a single hole is 20 mu m or less, so as to atomize the liquid fuel;
and step three, spraying the atomized liquid drops from the opening at the front end of the end cover.
The invention aims to provide a fuel stabilizing superfine atomizing nozzle for implementing the fuel stabilizing superfine atomizing nozzle atomizing method, which is provided with:
a nozzle;
the end part of the spray pipe is connected with the end cover through threads, an atomizing sheet is clamped between the spray pipe and the end cover, and the front end of the end cover is provided with an opening;
the atomizing sheet is made of a macroporous material which is orderly communicated in a porous material, the porosity is 50% or less, and the pore diameter of a single pore is 20 mu m or less.
In summary, the advantages and positive effects of the invention are: porous materials have been widely used in many fields due to their special properties. According to the difference of pore size, the porous materials can be divided into porous (pore size less than 2nm), mesoporous (pore size 2-50nm) and macroporous (pore size greater than 50 nm). Wherein, the porous structure is a structure which is mutually communicated or mutually sealed; in the through structure, it is also classified into ordered and disordered porous materials.
In the combustion aspect, many application analyses and experiments are carried out on porous medium combustion; but is mainly used as a regenerative combustion method of gas fuel. Research on the combustion of porous media of liquid fuels has also been reported, and most of them are arranged outside the nozzle as a means of secondary atomization or evaporative atomization.
The atomizing sheet adopts a porous ordered through macroporous material, and because the pore size of the atomizing sheet is provided with tiny through holes which cannot be realized by common machining, finer atomized liquid drops are realized; and the size of the liquid atomized liquid drop is independent of the change of the operation parameters, such as pressure, flow, air and the like, so that the stability of the atomization quality can be ensured even under the extreme condition that the operation parameters are changed rapidly.
Drawings
FIG. 1 is a flow chart of a method for atomizing a fuel-stabilized ultrafine atomizing nozzle according to an embodiment of the present invention.
FIG. 2 is a schematic structural view of a fuel-stabilized ultrafine atomizing nozzle provided by an embodiment of the invention.
Fig. 3 is an enlarged schematic view of the structure of the macroporous material atomization sheet provided by the embodiment of the invention.
In the figure: 1. an atomizing sheet; 2. an end cap; 3. and (4) a spray pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Aiming at the problems in the prior art, the invention provides a fuel oil stabilizing superfine atomizing nozzle and an atomizing method, and the invention is described in detail below with reference to the attached drawings.
As shown in fig. 1, an atomization method of a fuel stable ultrafine atomization nozzle provided by an embodiment of the invention includes:
s101: liquid fuel enters through the lance and passes through the atomizing plate.
S102: the atomizing sheet is made of a macroporous material which is orderly communicated in a porous material, the porosity is 50% or less, and the pore diameter of a single pore is 20 mu m or less, so that the liquid fuel is atomized.
S103: after atomization, the atomized liquid is sprayed out from the opening at the front end of the end cover.
As shown in fig. 2, the fuel-stabilized ultrafine atomizing nozzle provided by the embodiment of the present invention includes: atomizing piece 1, end cover 2, spray tube 3.
The end of the spray pipe 3 is connected with the end cover 2 through threads, the atomization piece 1 is clamped between the spray pipe 3 and the end cover 2, and the front end of the end cover 2 is provided with an opening.
Preferably, the atomizing sheet 1 has an ordered through macroporous material structure, a porosity of 50% or less, and a single pore diameter of 20 μm or less.
Preferably, the material of the atomization sheet 1 is not limited to only a metal material.
Preferably, the atomizing sheet 1 is clamped between the spray pipe 3 and the end cover 2 and can be replaced after the atomizing sheet 1 fails; meanwhile, the atomizing plates with different pore diameters or porosity can be replaced according to different liquid fuels or different atomizing quality requirements, so that the use requirements are met.
The working principle of the invention is as follows: liquid fuel enters through the spray pipe 3, is atomized by the atomizing plate 1 and then is sprayed out from an opening at the front end of the end cover 2; wherein, the atomizing sheet 1 adopts a macroporous material which is orderly communicated in a porous material, the porosity is 50 percent or less, the aperture of a single hole is 20 mu m or less, and the aperture is difficult to reach by mechanical processing; therefore, the aperture size is used for ensuring that the atomized particle size is qualified, the atomization particle size is not influenced by the operation parameters of primary atomization and secondary atomization, such as the change of pressure, flow, air parameters and the like, and the porous structures with different porosities can meet the requirement of flow, thereby achieving the effect of stabilizing superfine atomization.
Meanwhile, the atomization plate 1 is clamped between the end cover 2 and the fuel spray pipe 3, and the end cover 2 and the spray pipe 3 are connected through threads. By adopting the connecting structure, the atomizing plate 1 can be replaced after being out of service, and meanwhile, the atomizing plates with different pore diameters or porosity can be replaced according to different liquid fuels or different atomizing quality requirements so as to meet the use requirements.
As shown in fig. 3, the structure of the macroporous material atomization sheet provided by the embodiment of the present invention is enlarged schematically (microstructure of ordered metal porous material).
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. The utility model provides a superfine atomizing nozzle is stabilized to fuel, its characterized in that, superfine atomizing nozzle is stabilized to fuel is provided with:
a nozzle;
the end part of the spray pipe is connected with the end cover through threads, an atomizing sheet is clamped between the spray pipe and the end cover, and the front end of the end cover is provided with an opening;
the atomizing sheet is a macroporous material in a porous material.
2. The fuel-stabilizing ultra-fine atomizing nozzle of claim 1, wherein said macroporous material has a single pore size greater than 50nm and less than 20 μm.
3. The fuel-stabilizing ultra-fine atomizing nozzle of claim 1, wherein said macroporous material structure has a porosity of less than 50%.
4. The fuel stabilizing ultra-fine atomizing nozzle according to claim 1, wherein the hole-like structure of the macro-porous material is a front-rear through structure.
5. The fuel stabilizing ultra-fine atomizing nozzle of claim 1, wherein the through structure is an ordered macroporous material.
6. A method for atomizing a fuel stabilizing superfine atomizing nozzle is characterized by comprising the following steps:
step one, liquid fuel enters through a spray pipe and passes through an atomizing sheet;
secondly, the atomizing sheet adopts a macroporous material which is orderly communicated in a porous material, the porosity is 50 percent or less, and the aperture of a single hole is 20 mu m or less, so as to atomize the liquid fuel;
and step three, spraying the atomized liquid drops from the opening at the front end of the end cover.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010055542.4A CN111189045B (en) | 2020-01-17 | 2020-01-17 | Fuel oil stable superfine atomizing nozzle and atomizing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010055542.4A CN111189045B (en) | 2020-01-17 | 2020-01-17 | Fuel oil stable superfine atomizing nozzle and atomizing method |
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| CN111189045A true CN111189045A (en) | 2020-05-22 |
| CN111189045B CN111189045B (en) | 2021-12-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4088104A (en) * | 1975-07-10 | 1978-05-09 | Ibbott Jack Kenneth | Device and method for improving vaporization rate of volatile fuels |
| US4088437A (en) * | 1975-09-25 | 1978-05-09 | Daimler-Benz Aktiengesellschaft | Combustion chamber |
| JPH05133507A (en) * | 1991-11-15 | 1993-05-28 | Matsushita Electric Ind Co Ltd | Liquid fuel combustion device |
| US5730367A (en) * | 1996-07-26 | 1998-03-24 | Siemens Automotive Corporation | Fuel injector with air bubble/fuel dispersion prior to injection and methods of operation |
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| CN111189045B (en) | 2021-12-14 |
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