CN104728838B - Double-cavity liquid film miniature liquid combustor and combustion method thereof - Google Patents
Double-cavity liquid film miniature liquid combustor and combustion method thereof Download PDFInfo
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- CN104728838B CN104728838B CN201510130876.2A CN201510130876A CN104728838B CN 104728838 B CN104728838 B CN 104728838B CN 201510130876 A CN201510130876 A CN 201510130876A CN 104728838 B CN104728838 B CN 104728838B
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- inner core
- liquid
- fuel
- air
- liquid film
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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
- F23D11/32—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space by electrostatic means
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2202/00—Liquid fuel burners
Abstract
The invention discloses a double-cavity liquid film miniature liquid combustor and a combustion method thereof. A combustion barrel is composed of an inner barrel and an outer barrel, a plurality of primary ventilation holes are formed in the inner barrel in the circumferential direction at intervals, a gap between the lower end of the inner barrel and a lower end cover serves as a secondary ventilation opening, and a grid is arranged above the primary ventilation holes. Air entering from an air inlet tube drives liquid fuel coming from a fuel inlet to enter a gap between the outer wall of the inner barrel and the inner wall of the outer barrel in a rotational flow mode, so that a liquid film is formed by the liquid fuel and attached to the outer wall of the inner barrel, the liquid film on the outer wall of the inner barrel evaporates constantly as the air flows, mixed gas is formed by the liquid film and the air, one part of the mixed gas enters the inner barrel through the primary ventilation holes, and the other part of the mixed gas enters the inner barrel through the secondary ventilation opening of a lower port of the inner barrel from bottom to top. The combustor solves the technical problems that as for an existing miniature combustor, fuel is combusted insufficiently and unstably, flames are prone to extinguishing and combustion efficiency is low.
Description
Technical field
The present invention relates to burner, more particularly, to a kind of two-chamber liquid film minisize liquid burner and its combustion method.
Background technology
Development with micromodule equipment and use are day by day swift and violent, and whether industry is microrobot, miniature nothing in military affairs
Man-machine, microrocket etc. equip, or civilian in various micromodule equipments popularization, including equipment such as mobile phone, flat boards.From technology
From the point of view of development trend, equipment miniaturization will have huge development prospect.And the miniature functional device of main flow is mainly lithium at present
Battery, but there is the deficiency of energy density low (about 1.2kj/kg) in it.In contrast, the energy of typical liquid hydrocarbon fuels
Metric density is about 45mj/kg, because if efficient, stable, safe microburner can be developed, its application prospect will
Boundless.
But compared with traditional combustion, micro-scale gas flow faces lot of challenges.It is that radiation loss is big first, microburner
Face body is than the hundred times being conventional combustion face body ratio it means that the ratio of heat loss and quantity of heat production is big two than normal burner
The order of magnitude.Secondly the ignition mixture time of staying is short, and because the yardstick of micro-burner is too small, burning time in passage is too short.
Be followed by wall extinguishing, the probability that burner yardstick is too small to be improved reaction free radical and collision with wall and destroy, therefore and
Lead to flame quenching.It is finally the restriction of material aspect.
Content of the invention
It is an object of the invention to overcoming the shortcoming and defect of above-mentioned prior art, provide a kind of miniature liquid of two-chamber liquid film
Body burner and its combustion method.Solve that the burning of existing burner fuel is insufficient, unstable, the easy extinguishing of flame, burning effect
The low technical problem of rate.
The present invention is achieved through the following technical solutions:
A kind of two-chamber liquid film minisize liquid burner, the fuel nozzle 8 including combustion barrel, being arranged on combustion barrel bottom, use
In the lighter 11 lighting combustion barrel fuel；
Described combustion barrel is divided into outer tube 6 and inner core 7, and inner core 7 is placed in outer tube 6, the inwall of the outer wall of inner core 7 and outer tube 6
Between there is gap；
The upper port of described inner core 7 and outer tube 6 is provided with upper end cover 12, and the lower port of outer tube 6 is provided with bottom end cover 13, institute
State outer tube 6 upper portion side wall and be provided with air inlet duct 1, the side wall of air inlet duct 1 is provided with fuel inlet 3；
The middle part of sliding channel of described inner core 7 is circumferentially spaced to be provided with multiple air vent 5-1, the lower end of inner core 7
Mouth is provided with twice aeration mouth 5-2, is provided with grid 9, grid 9 top is combustor 2 above an air vent 5-1；
The air being entered by air inlet duct 1 drives the liquid fuel from fuel inlet 3, entered in the way of eddy flow in
In gap between the outer wall of cylinder 7 and the inwall of outer tube 6, make liquid fuel form liquid film 4 and be attached on the outer wall of inner core 7, with
The flowing air makes the liquid film on inner core 7 outer wall constantly evaporate, and is allowed to form mixed gas, this mixed gas one with air
Part enters in inner core 7 from an air vent 5-1, and another part enters from bottom to top from the twice aeration mouth 5-2 of inner core 7 lower port
Enter in inner core 7.
The mixed gas that a described air vent 5-1 enters in inner core 7 enter mixing in inner core 7 with twice aeration mouth 5-2
Close gas, both airflow directions are mutually perpendicular to.
The lower port of described inner core 7 is not contacted with bottom end cover 13；Gaseous mixture in inner core 7 is entered by an air vent 5-1
Body be the mixed gas entering in inner core 7 radially into, twice aeration mouth 5-2 be axially into.
The airflow direction of described air inlet duct 1 and the liquid flow path direction of fuel inlet 3 are mutually perpendicular to；Described fuel nozzle 8
Connect DC power anode, grid connects negative pole.
The outer wall surface of described inner core 7 is non-smooth surface.
The middle part of described upper end cover 12 offers tail gas outlet 10.
Described fuel nozzle 8 stretches into the inside of inner core 7, the lower section of an air vent 5-1 through bottom end cover 13；Described fuel
Nozzle 8 is made up of one or more capillary tube.
Described outer tube 6 top is provided with transparent observing wall 14.
The distance between the lower port of described inner core 7 and bottom end cover 13 are 1～2mm.
The combustion method of above-mentioned two-chamber liquid film minisize liquid burner is as follows:
Connect the DC source of fuel nozzle 8 and grid 9, fuel nozzle 8 sprays liquid fuel and forms fluerics, occur
Rupture is captured by grid 9 after forming spray film；
The air being entered by air inlet duct 1 drives the liquid fuel from fuel inlet 3, entered in the way of eddy flow in
In gap between the outer wall of cylinder 7 and the inwall of outer tube 6, liquid fuel is made to be formed in the presence of eddy flow in liquid film 4 is attached to
The outside wall surface of cylinder 7；
Flowing with air and the burning of fuel in combustion chamber, make the liquid film 4 being attached to inner core 7 outside wall surface be heated simultaneously
Constantly evaporate, be allowed to and air is heated in the gap between the outer wall and the inwall of outer tube 6 of inner core 7, form gaseous mixture
Body；
, from an air vent 5-1 radially in inner core 7, another part is from inner core for a mixed gas part after heated
The twice aeration mouth 5-2 of 7 lower port is from bottom to top axially in inner core 7；Then, the mixed gas after being heated are through grid
After 9, realize the stable diffusion combustion in the combustor 2 above grid 9 of liquid fuel, the waste gas after burning is by tail gas outlet
10 discharges.
The present invention, with respect to prior art, at least has such advantages as and effect:
(1) it is directed to the variety of problems that current micro-scale gas flow exists, this burner is using being made up of inner core 7 and outer tube 6
Two-chamber liquid feeding membrane structure, under the drive of rotational flow air, liquid fuel is attached to inner core (combustor) outer wall in the form of liquid film
Surface, absorbs the amount of heat that high-temperature combustion product passes over, with the evaporation of liquid film, not only can cool down burner wall
Face, reduces heat-loss at wall loss；And liquid film evaporation can be made using the heat of flame.Using twice aeration structure, Neng Gouzeng
The evaporation rate of liquid on screening lattice, is particularly suited for the liquid burning of more difficult evaporation, such as aero oil etc., reduces burner
The probability of extinguishing, improves burner integral combustion efficiency.
(2) combustible vapor of liquid film evaporation and air form rotation in the gap between wall and outer tube inner wall outer tube
Stream, makes combustible vapor mix more fully with air, and after combustible vapor is mixed with air and be heated, stability significantly carries
High；During with respect to adopting liquid burning under single Charged atomization in prior art, on grid, liquid fuel gasification is not sufficient
Situation, especially to high viscosity fuel liquid such as aero oil, this burner obviously can increase flame holding and easily effectively
Combustion property.
(3) air vent located under grid, tentatively increased the gasification further of drop on grid, especially liquid combustion
Burning is high viscosity, is difficult the fuel of gasification, such as Aviation Fuel etc..Meanwhile, an air vent enters the mixed gas in inner core
Enter the mixed gas in inner core with twice aeration mouth, both airflow directions are mutually perpendicular to, also will enter and further increase sky
The disturbance of air-flow, the two collective effect be issued to so that overheavy firing purpose.
(4) adopt fuel nozzle and Mesh connection HVDC, constitute Charged atomization, liquid spray can be effectively increased
Atomizing effect, has positive effect to steady combustion and strengthening.
(5) outer tube has transparent observing wall, convenient observation liquid film, real-time control thickness of liquid film.
Brief description
Fig. 1 is present configuration schematic diagram.
Fig. 2 is Fig. 1 along a-a generalized section.
Fig. 3 is Fig. 1 along b-b generalized section.
Specific embodiment
With reference to specific embodiment, the present invention is more specifically described in detail.
Embodiment
As shown in Figures 1 to 3.A kind of present invention two-chamber liquid film minisize liquid burner, including combustion barrel, is arranged on combustion barrel
The fuel nozzle 8 of bottom, the lighter 11 for lighting combustion barrel fuel；
Described combustion barrel is divided into outer tube 6 and inner core 7, and inner core 7 is placed in outer tube 6, the inwall of the outer wall of inner core 7 and outer tube 6
Between there is gap；Outer tube 6 and inner core 7 are all using ceramic material.
The upper port of described inner core 7 and outer tube 6 is provided with upper end cover 12, and the lower port of outer tube 6 is provided with bottom end cover 13, institute
State outer tube 6 upper portion side wall and be provided with air inlet duct 1, the side wall of air inlet duct 1 is provided with fuel inlet 3；Air inlet duct 1
For stainless pipe, radius 0.5～1mm, length 1～2mm.Fuel inlet 3 openings of sizes is the toroidal of radius 0.3mm.
The middle part of sliding channel of described inner core 7 is circumferentially spaced be provided with multiple air vent 5-1 (a diameter of 0.5～
1mm), the lower port of inner core 7 is provided with twice aeration mouth 5-2, is provided with grid 9, on grid 9 above an air vent 5-1
Side is combustor 2；Grid 9 is circular flat board, using stainless steel material, radius 4mm, and identical with inner core 7 radius, thickness 0.2～
Between 0.4mm.Grid 9 is made up of tinsel, and processes through roughening.
The air being entered by air inlet duct 1 drives the liquid fuel from fuel inlet 3, entered in the way of eddy flow in
In gap between the outer wall of cylinder 7 and the inwall of outer tube 6, make liquid fuel form liquid film 4 and be attached on the outer wall of inner core 7, with
The flowing air makes the liquid film on inner core 7 outer wall constantly evaporate, and is allowed to form mixed gas, this mixed gas one with air
Part enters in inner core 7 from an air vent 5-1, and another part enters from bottom to top from the twice aeration mouth 5-2 of inner core 7 lower port
Enter in inner core 7.
The mixed gas that a described air vent 5-1 enters in inner core 7 enter mixing in inner core 7 with twice aeration mouth 5-2
Close gas, both airflow directions are mutually perpendicular to.
The lower port of described inner core 7 is not contacted with bottom end cover 13；Gaseous mixture in inner core 7 is entered by an air vent 5-1
Body be the mixed gas entering in inner core 7 radially into, twice aeration mouth 5-2 be axially into.
The airflow direction of described air inlet duct 1 and the liquid flow path direction of fuel inlet 3 are mutually perpendicular to；Described fuel nozzle 8
Connect DC source (voltage is 1～6kv) positive pole, grid connects negative pole or ground.
The outer wall surface of described inner core 7 is non-smooth surface, that is, carry out surface thick good fortune PROCESS FOR TREATMENT, makes liquid film adhere to effect
Fruit is more preferably.Liquid film 4 thickness is typically in the range of between 0.1～1mm.
The middle part of described upper end cover 12 offers tail gas outlet 10.
Described fuel nozzle 8 stretches into the inside of inner core 7, the lower section of an air vent 5-1 through bottom end cover 13；Described fuel
Nozzle 8 is made up of one or more capillary tube.The internal diameter of capillary tube is 0.3mm～1.0mm, and external diameter is 0.5mm～1.2mm.
Described outer tube 6 top is provided with transparent observing wall 14.
The distance between the lower port of described inner core 7 and bottom end cover 13 are 1～2mm.
The combustion method of this two-chamber liquid film minisize liquid burner can be realized by following step:
Connect the DC source of fuel nozzle 8 and grid 9, fuel nozzle 8 sprays liquid fuel and forms fluerics, occur
Rupture is captured by grid 9 after forming spray film；
The air being entered by air inlet duct 1 drives the liquid fuel from fuel inlet 3, entered in the way of eddy flow in
In gap between the outer wall of cylinder 7 and the inwall of outer tube 6, liquid fuel is made to be formed in the presence of eddy flow in liquid film 4 is attached to
The outside wall surface of cylinder 7；
Flowing with air and the burning of fuel in combustion chamber, make the liquid film 4 being attached to inner core 7 outside wall surface be heated simultaneously
Constantly evaporate, be allowed to and air is heated in the gap between the outer wall and the inwall of outer tube 6 of inner core 7, form gaseous mixture
Body；
, from an air vent 5-1 radially in inner core 7, another part is from inner core for a mixed gas part after heated
The twice aeration mouth 5-2 of 7 lower port is from bottom to top axially in inner core 7；Then, the mixed gas after being heated are through grid
After 9, realize the stable diffusion combustion in the combustor 2 above grid 9 of liquid fuel, the waste gas after burning is by tail gas outlet
10 discharges.
As described above, just can preferably realize the present invention.
Embodiments of the present invention are simultaneously not restricted to the described embodiments, other any spirit without departing from the present invention
With the change made under principle, modification, replacement, combine, simplify, all should be equivalent substitute mode, be included in the present invention's
Within protection domain.
Claims (10)
1. a kind of two-chamber liquid film minisize liquid burner, the fuel nozzle (8) including combustion barrel, being arranged on combustion barrel bottom, use
In the lighter (11) lighting combustion barrel fuel；It is characterized in that:
Described combustion barrel is divided into outer tube (6) and inner core (7), and inner core (7) is placed in outer tube (6), the outer wall of inner core (7) and outer tube
(6) between inwall, there is gap；
The upper port of described inner core (7) and outer tube (6) is provided with upper end cover (12), and the lower port of outer tube (6) is provided with bottom end cover
(13), described outer tube (6) upper portion side wall is provided with air inlet duct (1), and the side wall of air inlet duct (1) is provided with fuel inlet
(3)；
The middle part of sliding channel of described inner core (7) is circumferentially spaced to be provided with multiple air vents (5-1), under inner core (7)
Port is provided with twice aeration mouth (5-2), and the top of an air vent (5-1) is provided with grid (9), is combustion above grid (9)
Burn room (2)；
The air being entered by air inlet duct (1) drives the liquid fuel from fuel inlet (3), entered in the way of eddy flow in
In gap between the outer wall of cylinder (7) and the inwall of outer tube (6), make liquid fuel form liquid film (4) and be attached to the outer of inner core (7)
On wall, the flowing with air makes the liquid film on inner core (7) outer wall constantly evaporate, and is allowed to form mixed gas with air, should
A mixed gas part enters in inner core (7) from an air vent (5-1), and another part is secondary logical from inner core (7) lower port
Air port (5-2) enters in inner core (7) from bottom to top.
2. two-chamber liquid film minisize liquid burner according to claim 1 it is characterised in that: a described air vent (5-
1) mixed gas that the mixed gas in inner core (7) enter in inner core (7) with twice aeration mouth (5-2), both air-flows are entered
Direction is mutually perpendicular to.
3. two-chamber liquid film minisize liquid burner according to claim 1 it is characterised in that: the lower end of described inner core (7)
Mouth is not contacted with bottom end cover (13)；Entering the mixed gas in inner core (7) by an air vent (5-1) is radially into secondary
The mixed gas that vent (5-2) enters in inner core (7) be axially into.
4. two-chamber liquid film minisize liquid burner according to any one of claim 1 to 3 it is characterised in that: described sky
The airflow direction of gas inlet tube (1) is mutually perpendicular to the liquid flow path direction of fuel inlet (3)；Described fuel nozzle (8) connects direct current
Positive source, grid connects negative pole.
5. two-chamber liquid film minisize liquid burner according to claim 4 it is characterised in that: the outer wall of described inner core (7)
Surface is non-smooth surface.
6. two-chamber liquid film minisize liquid burner according to claim 4 it is characterised in that: in described upper end cover (12)
Portion offers tail gas outlet (10).
7. two-chamber liquid film minisize liquid burner according to claim 4 it is characterised in that: described fuel nozzle (8) is worn
Cross bottom end cover (13) and stretch into the inside of inner core (7), the lower section of an air vent (5-1)；Described fuel nozzle (8) is by one or many
Capillary is constituted.
8. two-chamber liquid film minisize liquid burner according to claim 4 it is characterised in that: described outer tube (6) top sets
There is transparent observing wall (14).
9. two-chamber liquid film minisize liquid burner according to claim 4 it is characterised in that: the lower end of described inner core (7)
The distance between mouth and bottom end cover (13) are 1～2mm.
10. the combustion method of two-chamber liquid film minisize liquid burner any one of claim 1 to 9 is it is characterised in that such as
Lower step:
Connect the DC source of fuel nozzle (8) and grid (9), fuel nozzle (8) sprays liquid fuel and forms fluerics, send out
Raw rupture is captured by grid (9) after forming spray film；
The air being entered by air inlet duct (1) drives the liquid fuel from fuel inlet (3), entered in the way of eddy flow in
In gap between the outer wall of cylinder (7) and the inwall of outer tube (6), liquid fuel is made to form liquid film (4) in the presence of eddy flow attached
The outside wall surface in inner core (7)；
Flowing with air and the burning of fuel in combustion chamber, make the liquid film (4) being attached to inner core (7) outside wall surface be heated simultaneously
Constantly evaporate, be allowed to and air is heated in the gap between the outer wall and the inwall of outer tube (6) of inner core (7), formed mixed
Close gas；
, from an air vent (5-1) radially in inner core (7), another part is from inner core for a mixed gas part after heated
(7) the twice aeration mouth (5-2) of lower port is from bottom to top axially in inner core (7)；Then, the mixed gas warp after being heated
After crossing grid (9), realize the stable diffusion combustion in the combustor (2) above grid (9) of liquid fuel, the waste gas after burning
Discharged by tail gas outlet (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510130876.2A CN104728838B (en) | 2015-03-24 | 2015-03-24 | Double-cavity liquid film miniature liquid combustor and combustion method thereof |
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| CN201510130876.2A CN104728838B (en) | 2015-03-24 | 2015-03-24 | Double-cavity liquid film miniature liquid combustor and combustion method thereof |
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| CN104728838B true CN104728838B (en) | 2017-01-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105674260B (en) * | 2016-03-17 | 2018-11-02 | 华南理工大学 | A kind of minisize liquid burner and its combustion method with double preheating structure |
| CN107314370A (en) * | 2017-08-08 | 2017-11-03 | 东华理工大学 | A kind of alcohol-based fuel Electrostatic Spraying Combustion device |
| CN109579002B (en) * | 2018-10-29 | 2020-01-10 | 合肥工业大学 | Controllable evaporation type micro burner utilizing waste heat of flue gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2009129547A1 (en) * | 2008-04-18 | 2009-10-22 | The Board Of Trustees Of The University Of Alabama | Meso-scaled combustion system |
| CN102878555A (en) * | 2012-09-11 | 2013-01-16 | 华南理工大学 | Electrospray liquid fuel combustor |
| WO2014153564A1 (en) * | 2013-03-22 | 2014-09-25 | Safarik Charles Robert | Systems, methods, and apparatuses for providing viscous fluid in a particular format and implementations thereof |
| CN103791497A (en) * | 2014-01-24 | 2014-05-14 | 华南理工大学 | Double-grating charging mist spray minitype liquid burner |
| CN103791498A (en) * | 2014-01-24 | 2014-05-14 | 华南理工大学 | Charged spray catalytic micro burner |
| CN204593384U (en) * | 2015-03-24 | 2015-08-26 | 华南理工大学 | A kind of two-chamber liquid film minisize liquid burner |
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