CN107726302B - The micro-burner of flame holding is strengthened in a kind of gas preheating - Google Patents
The micro-burner of flame holding is strengthened in a kind of gas preheating Download PDFInfo
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- CN107726302B CN107726302B CN201710871505.9A CN201710871505A CN107726302B CN 107726302 B CN107726302 B CN 107726302B CN 201710871505 A CN201710871505 A CN 201710871505A CN 107726302 B CN107726302 B CN 107726302B
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- stage firing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C6/00—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion
- F23C6/04—Combustion apparatus characterised by the combination of two or more combustion chambers or combustion zones, e.g. for staged combustion in series connection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/03001—Miniaturized combustion devices using fluid fuels
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Abstract
The micro-burner for strengthening flame holding is preheated the invention discloses a kind of gas, including two first-stage firing chambers and a secondary combustion chamber being set between two first-stage firing chambers, two further respectively have an inlet channel between first-stage firing chamber and secondary combustion chamber；Gas enters inlet channel, successively enters first-stage firing chamber after tail gas preheating and the preheating of main burning gas；First-stage firing chamber, which is connected at inlet channel, is equipped with level-one flame stabilization bluff body；The high-temperature tail gas that first-stage firing chamber burning generates enters secondary combustion chamber, and the connectivity part of secondary combustion chamber and two first-stage firing chambers is equipped with second level flame stabilization bluff body, secondary combustion chamber burn away generation high-temperature tail gas discharge as heat source.The present invention is preheated by burning, and to reduce required energy of lighting a fire, shorten ignition delay time, reduction waste-heat rejection, while two-stage combustion room raising kindling rush is arranged and puts out the limit, widen inlet velocity.
Description
Technical field
The invention belongs to miniature scale technical field of power generation, preheat more particularly, to a kind of gas and strengthen flame holding
Micro-burner.
Background technique
With the development of microelectromechanical systems (MEMS) and the proposition of a variety of micromation military equipment concepts, volume is developed
Small, light weight, energy density be high, can the micro-energy system of continuous service have become various countries' focus of attention.Particularly, in recent years
Come, micro power systems are got over by its energy density height, long working life, easy to maintain and pollute the series of advantages such as small
More to cause the concern of numerous researchers at home and abroad.Such device can be by the chemical energy of hydrocarbon fuel by way of burning
Thermal energy is converted to, and provides power or electric energy by various energy conversion regimes for Micro Electro Mechanical System.As a kind of typical
Micro-power plant, minitype heat optoelectronic system structure is more simple, and does not have moving component, in numerous micro-power plants,
Its advantage is also obvious.The system burns generated thermal energy to burner outer wall using hydrocarbon fuel in microburner
Face is heated, and then high-temperature wall surface gives off the photon of certain amount, after hitting photoelectricity pool surface, to produce electricl energy.It is many
Multimachine structure devises the microburner of different structure, including annular micro-burner, swiss roll decline burner, straight tube or slit
Micro-burner etc., and tiny engine, minisize thermoelectric system, Micro-TPV systems system are developed according to different energy transform modes
A variety of miniature energy systems such as system, micro fuel cell, micro electromagnetic system.Due to the micromation of device, develop in recent years
Microburner generally faces the problem of the following aspects: combustion instability is even unable to ignition, fuel in microstructure size
Extremely short residence time leads to that efficiency of combustion is low, high-specific surface area causes heat heavy losses in the reactor with oxidant
Deng.
Summary of the invention
In view of the above-mentioned problems, the invention patent is to propose a kind of micro-combustion of gas preheating reinforcing flame holding
Device, it is intended that by preheating of burning, to reduce required energy of lighting a fire, shorten ignition delay time, reduction exhaust heat waste
It loses, while the raising kindling of two-stage combustion room is set and promotees to put out the limit, widen inlet velocity.
In order to realize technical purpose of the invention, the invention adopts the following technical scheme:
A kind of micro-burner, including two first-stage firing chambers and a secondary firing being set between two first-stage firing chambers
Room, two further respectively have an inlet channel between first-stage firing chamber and secondary combustion chamber；Gas enters inlet channel, successively
Enter first-stage firing chamber after the preheating of secondary combustion chamber's tail gas and the preheating of first-stage firing chamber burning gases；First-stage firing chamber connection
Level-one flame stabilization bluff body is equipped at inlet channel；The high-temperature tail gas that first-stage firing chamber burning generates enters secondary combustion chamber, and two
The connectivity part of grade combustion chamber and two first-stage firing chambers is equipped with second level flame stabilization bluff body, and secondary combustion chamber burns away generation
High-temperature tail gas discharge is used as heat source.
Further, the inlet channel includes channel partition, and master is formed between channel partition and first-stage firing chamber side wall
Burn preheating channel, and tail gas preheating channel is formed between channel partition and first-stage firing chamber side wall；Gas initially enters main burning
Preheating channel absorbs secondary combustion chamber's waste heat from tail gas, absorbs the burning of first-stage firing chamber gas subsequently into main burning preheating channel and releases
The heat put, finally enters first-stage firing chamber.
Further, inlet channel, first-stage firing chamber and secondary combustion chamber are plate, compact-sized, small in size, are accounted for
It is small with space.
Further, level-one flame stabilization bluff body section is triangle or circle or quadrangle, second level flame stabilization bluff body
Section is quadrangle.When entrance velocity is lower, gas is in the lesser single-stage combustion Indoor Combustion in space, using triangle or circle
Or the bluff body of quadrangular section can reduce flame stretching power, achieve the purpose that stable flame combustion；And entrance velocity it is higher when,
Gas is in the biggish secondary firing Indoor Combustion in space, using the bluff body of quadrangular section, on the one hand plays good water conservancy diversion and makees
With another aspect can also play the role of reducing flame stretching power raising flame holding.
Further, the ratio between the level-one bluff body width and first-stage firing chamber width are 0.2~0.4, second level bluff body width
It is 0.3~0.5 with the ratio between secondary combustion chamber width, there is the steady fuel efficiency fruit of optimal flame.
Further, when the burner inlet speed can stablize the maximum speed of burning lower than first-stage firing chamber, gas
It is formed in single-stage combustion room and stablizes flame, in single-stage combustion room and be completed at the same time burning in secondary firing room；Entrance velocity
When can stablize the maximum speed of burning more than first-stage firing chamber, gas is formed in secondary firing room to be stablized flame and fires in second level
Burn indoor completion burning.
The invention patent advantageous effects are embodied in:
(1) heat and waste heat from tail gas that can efficiently use primary combustion zone releasing (use non-premix to fuel and air
When combustion system) or they premix when premixed combustion mode (use) preheating, catalysis, to reduce needed for igniting
Energy shortens ignition delay time, while reducing waste-heat rejection；(2) entrance velocity can stablize burning lower than first-stage firing chamber
Maximum speed when, be sufficiently mixed using the recirculating zone of the low speed high temperature formed after bluff body fuel and air, extend combustion gas stop
Stay the time, stablize flame, in single-stage combustion room formed stablize flame, gas in first-stage firing chamber and secondary firing room simultaneously
Complete burning；(3) when entrance velocity is more than that first-stage firing chamber can stablize the maximum speed of burning, fuel combination and air are being flared
It is formed in the secondary firing room of type and stablizes flame, burning is completed in secondary firing room.Therefore, which can effectively expand surely
The limit is fired, efficiency of combustion is improved, is widely used in various microminiature dynamical systems.
Detailed description of the invention
Fig. 1 is the two-dimensional representation (its symmetrical structure, only draw half) of structure of the invention；
Fig. 2 is the 3 d effect graph of Fig. 1, and wherein this partial 3-D figure is a quarter part of practical pictorial diagram；
Fig. 3 is the photronic typical outside wall surface of one patch of the present invention (heavy black region outside wall surface is patch photoelectricity pool area)；
Fig. 4 is central symmetry section temperature distribution map under several friction speeds of the present invention；
Fig. 5 is typical outside wall surface temperature profile under several friction speeds of the present invention；
Fig. 6 is that outside wall surface mean temperature, temperature deviation, outlet temperature, efficiency of combustion are bent under several friction speeds of the present invention
Line chart；
Wherein, 1- entrance 2- waste heat from tail gas preheating channel 3- main burning gas preheating channel 4- level-one flame stabilization bluff body
5- first-stage firing chamber 6- first-stage firing chamber side wall 7- first-stage firing chamber exports water conservancy diversion protrusion platform 8- secondary combustion chamber 9- second level
The outlet flame stabilization bluff body 10- outer wall of combustion chamber face 11-
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1, microburner provided by the invention mainly includes two first-stage firing chambers, 5, secondary firings
Room 8, inlet channel, level-one flame stabilization bluff body 4, second level flame stabilization bluff body 9.
Secondary combustion chamber 8 is set between two first-stage firing chambers 5, between two first-stage firing chambers 5 and secondary combustion chamber 8 also
It is respectively equipped with an inlet channel；First-stage firing chamber 5, which is connected at inlet channel, is equipped with level-one flame stabilization bluff body 4；Single-stage combustion
The high-temperature tail gas that the burning of room 5 generates enters secondary combustion chamber 8, and secondary combustion chamber 8 and the connectivity part of two first-stage firing chambers 5 are set
Have a second level flame stabilization bluff body 9, secondary combustion chamber 8 burn away generation high-temperature tail gas discharge as heat source.
Fuel and air (when using non-premixed combustion mode) or their premix (use premixed combustion mode
When) successively enter one after the preheating twice that tail gas preheating and main burning gas preheat from entrance 1 by inlet channel respectively
Grade combustion chamber, ignition immediately, first-stage firing chamber generate high-temperature tail gas via after secondary combustion chamber 8 pass through offgas outlet 11
Discharge can be used to provide heat source for minisize thermoelectric device or miniature thermal photovoltaic system, also can be used as miniature propulsion system
High-temperature fuel gas generates thrust by subsequent jet pipe.
When entrance velocity can stablize the maximum speed of burning lower than first-stage firing chamber, gas is formed surely in single-stage combustion room
Determine flame, in single-stage combustion room and is completed at the same time burning in secondary firing room；Entrance velocity is more than that first-stage firing chamber can be stablized
When the maximum speed of burning, gas is formed in secondary firing room to be stablized flame and completes burning in secondary firing room.
According to a kind of preferable embodiment, inlet channel includes channel partition, channel partition and first-stage firing chamber side wall
Between formed main burning preheating channel 3, between channel partition and first-stage firing chamber side wall 6 formed tail gas preheating channel 2；Gas is first
It is introduced into tail gas preheating channel 2 and absorbs secondary combustion chamber's waste heat from tail gas, absorb single-stage combustion subsequently into main burning preheating channel 3
The heat of room gas burning release, finally enters first-stage firing chamber 5.
Level-one flame stabilization bluff body 4 is installed on 5 inlet of first-stage firing chamber, first-stage firing chamber bluff body section be triangle or
Round or quadrangle, is mounted on the inlet of first-stage firing chamber, and the ratio between bluff body width and combustion chamber width are 0.2~0.4.
Second level flame stabilization bluff body 9 is located at 8 inlet of secondary combustion chamber, and secondary combustion chamber's flame stabilization body 9 is four sides
Shape, the ratio between width and secondary combustion chamber's width are 0.3~0.5.
When entrance velocity is more than the blow-off velocity of first-stage firing chamber bluff body, flame cannot stablize burning in single-stage combustion room
It is even flame-out, but gas passes through secondary combustion chamber 8 and can achieve stable burning under the action of second level flame stabilization bluff body 9
Purpose, which greatly enhances the rush of flame to put out speed.
When entrance velocity is lower than the blow-off velocity of first-stage firing chamber, flame burns in first-stage firing chamber, secondary combustion chamber
It is used as fuel secondary furnace and accumulation of heat, achievees the purpose that reduce waste-heat rejection, improves efficiency of combustion.
When entrance velocity is between the blow-off velocity of first-stage firing chamber and the blow-off velocity of secondary combustion chamber, flame exists
Secondary combustion chamber's burning, first-stage firing chamber are preheated as fuel and air and are used.
Next we enumerate one embodiment: methane and air are using premixed combustion mode is shifted to an earlier date, and wherein burner is whole
Body thickness is 3mm (direction z, wherein cavity thickness are 2mm, wall thickness 0.5mm), and burner entire length is 16mm (x
Direction), burner overall width is 12mm (direction y).The width of preheating channel is 0.5mm, and first-stage firing chamber width is 2mm,
Secondary combustion chamber's width is 4mm, and burner overall thickness is 5mm, and wherein for outside wall surface with a thickness of 0.5mm, bluff body is that side length is 0.5mm
Equilateral triangle.Solid material is steel, and density, thermal capacitance, thermal coefficient and normal emittance are respectively 8000kg/m3、
500J/(kgK)、24W/(m2) and 0.2 K.Using the method for fluent numerical simulation, using detailed methyl hydride combustion mechanism (19
Walk 58 primitives), equivalent proportion has carried out numerical simulation for 0.7.It is illustrated in figure 4 central symmetry cross-section temperature field, it can be seen that
It all can still stablize burning reducing speed such as 1m/s or fair speed such as 6m/s or more, premixed gas；First-stage firing chamber and two
The critical speed of grade combustion chamber is 5.1m/s；When speed is between 0.5-5.1m/s, methane stablizes combustion in single-stage combustion room
It burns；When speed is in 5.1-15m/s, methane stablizes burning in secondary firing room.Burning velocity range between 1-15m/s,
Wider range.Be illustrated in figure 5 outside wall surface temperature field, Fig. 6 be outside wall surface temperature averages, temperature deviation, outlet temperature and
Efficiency of combustion, it can be seen that outside wall surface temperature highest under critical speed, and stablizing deviation is 16K, and efficiency of combustion is higher, reaches
Close to 100%.
As it will be easily appreciated by one skilled in the art that the above description is only an embodiment of the present invention, not to limit
The present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in this
Within the protection scope of invention.
Claims (5)
1. a kind of micro-burner, which is characterized in that be set between two first-stage firing chambers including two first-stage firing chambers and one
Secondary combustion chamber, two further respectively have an inlet channel between first-stage firing chamber and secondary combustion chamber；Gas enters air inlet
Channel successively enters first-stage firing chamber after the preheating of secondary combustion chamber's tail gas and the preheating of first-stage firing chamber burning gases；Level-one
Level-one flame stabilization bluff body is equipped at combustion chamber inlet channel；The high-temperature tail gas that first-stage firing chamber burning generates enters second level
The connectivity part of combustion chamber, secondary combustion chamber and two first-stage firing chambers is equipped with second level flame stabilization bluff body, and secondary combustion chamber continues
The high-temperature tail gas discharge that burning generates is used as heat source.
2. micro-burner according to claim 1, which is characterized in that the inlet channel includes channel partition, channel every
Main burning preheating channel is formed between plate and first-stage firing chamber side wall, forms tail gas between channel partition and first-stage firing chamber side wall
Preheating channel；Gas initially enters main burning preheating channel and absorbs secondary combustion chamber's waste heat from tail gas, preheats subsequently into main burning
Channel absorbs the heat of first-stage firing chamber gas burning release, finally enters first-stage firing chamber.
3. micro-burner according to claim 1 or 2, it is characterised in that inlet channel, first-stage firing chamber and secondary firing
Room is plate.
4. micro-burner according to claim 1 or 2, which is characterized in that level-one flame stabilization bluff body section is triangle
Or round or quadrangle, second level flame stabilization bluff body section are quadrangle.
5. micro-burner according to claim 4, which is characterized in that the level-one flame stabilization bluff body width and level-one are fired
Burning the ratio between room width is 0.2~0.4, and the ratio between second level flame stabilization bluff body width and secondary combustion chamber's width are 0.3~0.5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710871505.9A CN107726302B (en) | 2017-09-25 | 2017-09-25 | The micro-burner of flame holding is strengthened in a kind of gas preheating |
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| CN201710871505.9A CN107726302B (en) | 2017-09-25 | 2017-09-25 | The micro-burner of flame holding is strengthened in a kind of gas preheating |
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| CN107726302A CN107726302A (en) | 2018-02-23 |
| CN107726302B true CN107726302B (en) | 2019-04-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111623349A (en) * | 2020-05-27 | 2020-09-04 | 华中科技大学 | Double-cavity annular micro-combustor based on Swiss roll structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109163326B (en) * | 2018-07-09 | 2020-03-31 | 江苏大学 | Micro-combustor capable of controlling flame position |
| CN111864237B (en) * | 2020-06-17 | 2021-07-20 | 江苏大学 | Hydrogen fuel cell tail gas aftertreatment device based on catalysis and micro-combustion |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4720396B2 (en) * | 2005-09-21 | 2011-07-13 | 株式会社Ｉｈｉ | Micro combustor |
| CN202056882U (en) * | 2011-03-09 | 2011-11-30 | 华中科技大学 | Microminiature combustor |
| CN102678325A (en) * | 2012-05-14 | 2012-09-19 | 华中科技大学 | Microminiature thermoelectricity generating set based on combustion |
| CN103475268B (en) * | 2013-09-03 | 2016-04-20 | 华中科技大学 | A kind of micro-combustion Blast Furnace Top Gas Recovery Turbine Unit (TRT) |
| CN204153777U (en) * | 2014-09-23 | 2015-02-11 | 江苏嘉和热系统股份有限公司 | A kind of multi-channel miniature burner of built-in parallel baffle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111623349A (en) * | 2020-05-27 | 2020-09-04 | 华中科技大学 | Double-cavity annular micro-combustor based on Swiss roll structure |
| CN111623349B (en) * | 2020-05-27 | 2021-07-27 | 华中科技大学 | Double-cavity annular micro-combustor based on Swiss roll structure |
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