CN109307264B - Micro combustor based on liquid fuel - Google Patents
Micro combustor based on liquid fuel Download PDFInfo
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- CN109307264B CN109307264B CN201811204418.9A CN201811204418A CN109307264B CN 109307264 B CN109307264 B CN 109307264B CN 201811204418 A CN201811204418 A CN 201811204418A CN 109307264 B CN109307264 B CN 109307264B
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- wall
- shell
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- oil
- combustor
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Classifications
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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
- F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
- F23D11/101—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet
- F23D11/102—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet in an internal mixing chamber
- F23D11/103—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour medium and fuel meeting before the burner outlet in an internal mixing chamber with means creating a swirl inside the mixing chamber
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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
- F23D11/44—Preheating devices; Vaporising devices
- F23D11/441—Vaporising devices incorporated with burners
- F23D11/443—Vaporising devices incorporated with burners heated by the main burner flame
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Nozzles For Spraying Of Liquid Fuel (AREA)
Abstract
The invention relates to a micro combustor based on liquid fuel, and relates to the technical field of engines. The invention 1) has no any restriction on the type of fuel oil, can adopt various liquid fuels and even gaseous fuels, and 2) preheats the fuel oil, thereby ensuring that the fuel oil can be efficiently evaporated and combusted; 3) ignition delay is reduced, ignition success rate is improved, and the increase of residence time of fuel oil and fuel gas can be realized in a smaller size, so that the geometric size required by an igniter is reduced; 4) the heat load formed on the inner wall in the combustion process can be effectively absorbed, so that the surface temperature is reduced, and the service life of the combustor is prolonged.
Description
Technical Field
the invention relates to the technical field of engines, in particular to a micro combustor based on liquid fuel.
Background
Liquid fuel-based micro-burners are micro-burners that use liquid fuel as fuel and air as oxidant, and have air flow rates on the order of "grams per second" (typically less than 5g/s) for the burner. The combustion device has great application potential in a micro-electromechanical system. The heat loss rate of the micro-combustor is in direct proportion to the surface area/volume (S/V) and the temperature of the outer wall surface, the S/V of the micro-combustor is 2-3 orders of magnitude greater than that of the micro-combustor under the conventional scale, and the increase of heat loss causes unstable flame, flameout, reduction of heat efficiency and the like. Compared with gas fuel, liquid fuel has the advantages of high energy density, easy transportation and storage, etc. The micro-combustor mainly uses gaseous fuel which is easy to burn as the main part, and the micro-combustor of liquid fuel has great difficulty, so that the micro-combustor lacks relevant information of application at present.
the alcohol-fueled micro-combustor shown in fig. 1 is constructed to operate by supplying high voltage to the fuel, and is complicated in construction and requires additional continuous power as an input condition.
the nozzle is connected with the anode of a high-voltage power supply, the grid is grounded, fuel is charged in a contact mode, is crushed into small liquid drops under the action of coulomb force and surface tension of charged liquid, spray is formed between the nozzle and the grid under the traction action of electric field force, and after the spray is collected by the grid, the spray is combusted in an external heat source heating ignition mode.
The main disadvantages of this construction are:
1) The structure is complex, and a metal net needs to be arranged in the combustor;
2) The system has low efficiency and weak functionality, and can atomize the liquid fuel only by continuous electric energy input;
3) the fuel type is single, and the fuel which is difficult to charge cannot be combusted;
4) The system is complex and the production cost is high.
Disclosure of Invention
Technical problem to be solved
The technical problem to be solved by the invention is as follows: how to design a low-cost, simple in construction, can burn many kinds of liquid fuel, long-lived, efficient miniature combustion device.
(II) technical scheme
In order to solve the technical problem, the invention provides a micro combustor based on liquid fuel, which comprises an upper shell 1 and a lower shell;
the molded surface of the upper shell 1 is one of a semi-elliptical, semi-circular, semi-elliptical and rectangular combined structure and a semi-circular and rectangular combined structure; the lower shell is formed by connecting an upper end wall 2, an outer shell 3, a lower end wall 5 and an inner wall 6 in a welding mode, and encloses an annular cavity serving as a gas collection cavity, 4-8 inclined holes with a wall surface normal inclination angle of 30-60 degrees are formed in the inner wall 6 and serve as gas inlet holes, and the inclined holes are uniformly arranged in the circumferential direction;
The upper shell 1 and the upper end wall 2 of the lower shell are connected, the inner wall 6 is a cylindrical surface, and the shape and the area of the lower port of the upper shell 1 are matched with those of the upper port of the inner wall 10; the upper shell 1 is provided with a semiconductor electric nozzle 10; an air inlet 4 is arranged on the outer shell 3 of the lower shell, and the air inlet 4 is connected with the outer shell 3 of the lower shell in a welding mode; an oil inlet 7 is further arranged at the position, opposite to the air inlet 4, on the outer shell 3, an evaporating pipe 8 is arranged in a combustor inner cavity defined by the upper shell 1 and the inner wall 6, the evaporating pipe 8 is L-shaped, the horizontal end penetrates through the inner wall 6 from the combustor inner cavity to be communicated with the annular cavity and is opposite to the oil inlet 7, and the vertical end is opposite to the center of the top of the upper shell 1; the oil inlet 7 is also connected with an oil supply device, and the oil supply device is connected with the oil inlet 7 in a threaded connection mode and is sealed through conical surface contact; the oil supply device is a hollow structure with two ends of a conical sealing head or a spherical sealing head, a hollow pipeline at the central shaft position of the oil supply device is used for fuel oil to flow through, and a metal pipe is arranged in the hollow pipeline.
preferably, the upper shell 1 and the upper end wall 2 of the lower shell are connected by screws 9.
Preferably, the number of the screws is 4-6, the screws are evenly arranged in the circumferential direction,
Preferably, the semiconductor electric nozzle 10 is connected with the upper shell 1 by adopting a threaded connection mode.
Preferably, the oil inlet 7 is welded to the outer housing 3.
preferably, the central axis of the evaporation pipe 8 passing through the port of the inner wall 6 is coaxial with the central axis of the oil inlet 7.
Preferably, the diameter of the hollow pipeline at the central axis position of the oil supply device is 0.2-0.6 mm.
Preferably, a metal pipe with the inner diameter smaller than 0.3mm is installed in the hollow pipeline.
(III) advantageous effects
In the invention, 1) the evaporation adopts an L-shaped evaporation pipe, the fuel atomization adopts a hollow pipeline in the fuel supply device, and the metal pipe is arranged in the pipeline, so that the scheme has no any limitation on the type of the fuel, and various liquid fuels and even gaseous fuels can be adopted. Adopt 2) reverse heat transfer structure: the fuel enters the combustor from the evaporating pipe, the inlet of the evaporating pipe is positioned at the rear part of the combustor, and in a working state, the fuel flows through the outer evaporating surface, so that the fuel is preheated, and the high-efficiency evaporation and combustion of the fuel are guaranteed. 3) The inner wall surface is designed with multiple inclined holes to form a vortex system structure for circumferential vortex combustion, the vortex system structure comprises a vortex system structure tightly attached to the inner wall surface of the inner wall, and a circumferential vortex system flow structure is formed by entrainment of internal flow by the vortex system structure. Ignition delay is reduced, ignition success rate is improved, and increase of residence time of fuel oil and gas can be realized in a smaller size, so that the geometric size required by the igniter is reduced. Adopting 4) a ring cavity heat insulation and preservation structure; the annular gas collecting cavity formed by the surrounding of the four walls forms a certain annular air flow, and can effectively absorb the heat load formed on the inner wall in the combustion process, thereby reducing the surface temperature and prolonging the service life of the combustor.
Drawings
FIG. 1 is a schematic diagram of the operation of a micro burner for ethanol fuel;
FIG. 2 is a cross-sectional view of the burner of the present invention;
Fig. 3 is a sectional view of the oil supply device of the present invention.
Detailed Description
In order to make the objects, contents, and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
as shown in fig. 2, the present invention provides a micro burner based on liquid fuel, comprising an upper case 1 and a lower case.
The molded surface of the upper shell 1 is one of a semi-elliptical, semi-circular, semi-elliptical and rectangular combined structure and a semi-circular and rectangular combined structure; the lower shell is formed by connecting an upper end wall 2, an outer shell 3, a lower end wall 5 and an inner wall 6 in a welding mode, and encloses an annular cavity serving as a gas collection cavity, 4-8 inclined holes with a wall surface normal inclination angle of 30-60 degrees are formed in the inner wall 6 and serve as gas inlet holes, and the inclined holes are uniformly arranged in the circumferential direction;
The upper shell 1 and the upper end wall 2 of the lower shell are connected by screws 9, the number of the screws is 4-6, the screws are circumferentially and uniformly arranged, the inner wall 6 is a cylindrical surface, and the shape and the area of the lower port of the upper shell 1 are matched with those of the upper port of the inner wall 10; the upper shell 1 is provided with a semiconductor electric nozzle 10; the semiconductor electric nozzle 10 is connected with the upper shell 1 in a threaded connection mode, the outer shell 3 of the lower shell is provided with an air inlet 4, and the air inlet 4 is connected with the outer shell 3 of the lower shell in a welding mode; an oil inlet 7 and an oil inlet 7 are further arranged on the outer shell 3 and are welded on the outer shell 3 at a position 180 degrees away from the air inlet 4, an evaporating pipe 8 is arranged in a combustor inner cavity defined by the upper shell 1 and the inner wall 6, the evaporating pipe 8 is L-shaped, one end of a short arm at a horizontal end penetrates through the inner wall 6 from the combustor inner cavity and is communicated with the annular cavity, the central axis of the evaporating pipe 8 which is opposite to the oil inlet 7 and penetrates through the port of the inner wall 6 is coaxial with the central axis of the oil inlet 7, and the vertical end is opposite to the top center of the upper shell 1. The oil inlet 7 is also connected with an oil supply device, and the oil supply device is connected with the oil inlet 7 in a threaded connection mode and is sealed through conical surface contact. As shown in figure 3, the oil supply device is a hollow structure with conical sealing heads or spherical sealing heads at two ends, the diameter of a hollow pipeline at the central shaft position of the oil supply device is 0.2-0.6mm for fuel oil to flow through, and a metal pipe with the inner diameter smaller than 0.3mm is installed in the pipeline.
The working process and principle of the burner of the invention are as follows:
Air enters the lower shell through the air inlet 4, an annular cavity serving as a gas collecting cavity is formed by the upper end wall 2, the outer shell 3, the lower end wall 5 and the inner wall 6, then enters the inner cavity of the combustor formed by the upper shell 1 and the lower shell through air inlets formed in the inner wall 6, and a certain rotational flow structure is formed due to the inclination of an air inlet angle. The fuel oil passes through a flow path with the diameter of 0.2-0.6mm in the oil supply device, the flowing continuity of the fuel oil is guaranteed, and the injection speed of the fuel oil is guaranteed, so that the radius of a fuel oil column sprayed from the outlet of the oil supply device or the diameter of fuel oil particles is small, the fuel oil directly enters the inlet of the evaporation pipe 8, is fully mixed with air entering the evaporation pipe 8, flows along the evaporation pipe 8 along with the air, and enters the inner cavity of the combustor. Due to the atomization, the fuel is injected into the burner interior in the form of fine particles. Furthermore, the fuel particles are fully mixed with the air in the combustion chamber, and the two-phase flow distribution structure has a certain oil-gas distribution rule. Further, the semiconductor electric nozzle 10 converts the electric energy into heat energy in the form of ignition spark, so as to ignite the oil gas distribution field, form a violent combustion chemical reaction, and produce high-temperature gas to be sprayed out of the combustor.
High-temperature fuel gas generated inside the combustion chamber passes through the evaporation tube 8 before being sprayed out of the combustor and then is subjected to strong heat exchange with air in the evaporation tube 8, so that the temperature of the air in the evaporation tube 8 and the temperature of fuel oil are increased, the fuel oil can be fully converted into a gaseous state from a liquid state before being discharged out of an outlet of the evaporation tube 8, and the completeness of combustion is guaranteed.
The air current gets into by air inlet 4 the ring chamber, then gets into the inclined hole of seting up on inner wall 6, and then gets into inside the combustor inner chamber, and this process had both let the ring chamber play the effect of gas collection, had ensured that each hole air input is the same, simultaneously, can cool off the inner wall again, absorbs the outside heat-conduction of inner wall, reduces the loss of whole combustor heat to the external environment.
The design of the lower shell outlet can be designed according to the object to be heated or the working medium injection object, so that the outlets with different radiuses can be switched.
Compared with the prior art, the combustor disclosed by the invention has the advantages that the service life is long, various liquid fuels such as kerosene, ethanol, diesel oil and heavy oil can be combusted), the usable range of the fuels is greatly widened, the high-efficiency and stable combustion can be realized, stable high-temperature fuel gas can be generated, and the working range is wide. Experiments prove that the gas-liquid separator can adapt to working environments with dozens of atmospheric pressures, the flow range of the generated gas is 0-10g/s, and the temperature range is 800-1800K.
the above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A micro burner based on liquid fuel is characterized by comprising an upper shell (1) and a lower shell;
The molded surface of the upper shell (1) is one of a semi-elliptical structure, a semi-circular structure, a combined structure of the semi-elliptical structure and a rectangular structure, and a combined structure of the semi-circular structure and the rectangular structure; the lower shell is formed by connecting an upper end wall (2), an outer shell (3), a lower end wall (5) and an inner wall (6) in a welding mode, and encloses an annular cavity serving as a gas collection cavity, 4-8 inclined holes with an inclination angle of 30-60 degrees to the normal direction of the wall surface are formed in the inner wall (6) and serve as gas inlet holes, and the inclined holes are uniformly arranged in the circumferential direction;
the upper end wall (2) of the upper shell (1) and the lower end wall (2) of the lower shell are connected, the inner wall (6) is a cylindrical surface, and the shape and the area of the lower port of the upper shell (1) are matched with those of the upper port of the inner wall (6); the upper shell (1) is provided with a semiconductor electric nozzle (10); an air inlet (4) is arranged on the outer shell (3) of the lower shell, and the air inlet (4) is connected with the outer shell (3) of the lower shell in a welding mode; an oil inlet (7) is further formed in the position, opposite to the air inlet (4), of the outer shell (3), an evaporating pipe (8) is arranged in a combustor inner cavity defined by the upper shell (1) and the inner wall (6), the evaporating pipe (8) is L-shaped, the horizontal end penetrates through the inner wall (6) from the combustor inner cavity to be communicated with the annular cavity and is opposite to the oil inlet (7), and the vertical end is opposite to the top center of the upper shell (1); the oil inlet (7) is also connected with an oil supply device, and the oil supply device is connected with the oil inlet (7) in a threaded connection mode and is sealed through conical surface contact; the oil supply device is a hollow structure with two ends of a conical sealing head or a spherical sealing head, a hollow pipeline at the central shaft position of the oil supply device is used for fuel oil to flow through, and a metal pipe is arranged in the hollow pipeline.
2. The micro-burner as claimed in claim 1, characterized in that the upper housing (1) and the upper end wall (2) of the lower housing are connected by means of screws (9).
3. The micro combustor according to claim 2, wherein the number of the screws is 4 to 6 and is circumferentially and uniformly arranged.
4. the micro burner as claimed in claim 1, wherein the semiconductor burner (10) is connected to the upper housing (1) by means of a screw connection.
5. The micro burner as claimed in claim 1, wherein the oil inlet (7) is welded to the outer housing (3).
6. the micro burner as claimed in claim 1, wherein the evaporation tube (8) is coaxial with the central axis of the oil inlet (7) through the central axis of the port of the inner wall (6).
7. The micro burner as claimed in claim 1, wherein the hollow pipe at the central axis position of the oil supplier has a diameter of 0.2 to 0.6 mm.
8. The micro-combustor of claim 7, wherein the hollow conduit has mounted therein a metal tubing having an inner diameter of less than 0.3 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811204418.9A CN109307264B (en) | 2018-10-16 | 2018-10-16 | Micro combustor based on liquid fuel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811204418.9A CN109307264B (en) | 2018-10-16 | 2018-10-16 | Micro combustor based on liquid fuel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109307264A CN109307264A (en) | 2019-02-05 |
| CN109307264B true CN109307264B (en) | 2019-12-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811204418.9A Active CN109307264B (en) | 2018-10-16 | 2018-10-16 | Micro combustor based on liquid fuel |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10205714A (en) * | 1997-01-22 | 1998-08-04 | Toshiba Home Technol Corp | Vaporization type combustion appliance |
| CN202303371U (en) * | 2011-08-31 | 2012-07-04 | 李永安 | Liquid fuel gasified combustion device |
| CN105674260A (en) * | 2016-03-17 | 2016-06-15 | 华南理工大学 | Miniature liquid burner adopting double-preheating structure and burning method of liquid burner |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201327884A (en) * | 2011-12-16 | 2013-07-01 | Univ Nat Cheng Kung | A combustor applied in thermophotovoltaic system |
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2018
- 2018-10-16 CN CN201811204418.9A patent/CN109307264B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10205714A (en) * | 1997-01-22 | 1998-08-04 | Toshiba Home Technol Corp | Vaporization type combustion appliance |
| CN202303371U (en) * | 2011-08-31 | 2012-07-04 | 李永安 | Liquid fuel gasified combustion device |
| CN105674260A (en) * | 2016-03-17 | 2016-06-15 | 华南理工大学 | Miniature liquid burner adopting double-preheating structure and burning method of liquid burner |
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| Publication number | Publication date |
|---|---|
| CN109307264A (en) | 2019-02-05 |
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