CN105864766B - A kind of multicenter combustor - Google Patents
A kind of multicenter combustor Download PDFInfo
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- CN105864766B CN105864766B CN201610262234.2A CN201610262234A CN105864766B CN 105864766 B CN105864766 B CN 105864766B CN 201610262234 A CN201610262234 A CN 201610262234A CN 105864766 B CN105864766 B CN 105864766B
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- burning gallery
- burning
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- segment passage
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- 239000007789 gas Substances 0.000 claims description 22
- 238000002485 combustion reaction Methods 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 14
- 239000007800 oxidant agent Substances 0.000 claims description 14
- 230000001590 oxidative effect Effects 0.000 claims description 12
- 239000002737 fuel gas Substances 0.000 claims description 11
- 239000001257 hydrogen Substances 0.000 claims description 8
- 229910052739 hydrogen Inorganic materials 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 7
- 239000010935 stainless steel Substances 0.000 claims description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 2
- 239000011521 glass Substances 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 13
- 238000010248 power generation Methods 0.000 abstract description 11
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 238000003786 synthesis reaction Methods 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 description 12
- 238000005457 optimization Methods 0.000 description 9
- 208000030208 low-grade fever Diseases 0.000 description 7
- 239000000446 fuel Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000003134 recirculating effect Effects 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005183 dynamical system Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000033772 system development Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
- H02S10/30—Thermophotovoltaic systems
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a kind of multicenter combustor, including multiple burning galleries arranged side by side, the center line of multiple burning galleries to be parallel to each other and be respectively positioned on same plane；For any one burning gallery, which includes first segment passage and second segment passage；The cross sectional area of the first segment passage on the centerline direction perpendicular to the burning gallery is less than cross sectional area of the second segment passage on the centerline direction perpendicular to the burning gallery；Burning gallery is used for burning combustible gas；Spacing in multiple burning galleries between two neighboring burning gallery center line is equal.Burner surface temperature height in the present invention, temperature uniformity are good, available for photovoltaic power generation apparatus radiated photons, produce thermal photovoltaic power generation effect, improve the synthesis transfer efficiency of energy.
Description
Technical field
The invention belongs to micro-scale gas flow technical field, and more particularly, to a kind of multicenter combustor, which is
A kind of micro-burner suitable for microkinetic/electricity generation system, can be applied to low-grade fever photovoltaic generating system etc..
Background technology
With the progress of human society, people increasingly increase the demand of the microminiature portable set of various civil and militaries
It is more.The fast development of micro-processing technology, make these microelectromechanical systems and equipment is manufactured as possibility, occurs in succession micro-
The portable electric appts such as type satellite, microrobot and mobile phone.At present, these equipment are mostly driven by traditional chemical cell
It is dynamic, but battery is there are the shortcomings of energy density is small, volume and weight is big, the charging interval is long, and the energy density of HC fuel
50-100 times is higher by than battery.Therefore, the microminiature dynamical system based on burning is expected to now widely used in future substitution
Chemical cell.Researchers have successfully been manufactured that micro- combustion gas turbine, Mini Rotary Engine, micromass culture system, low-grade fever photovoltaic
Electricity generation system and low-grade fever electric installation system etc., wherein, micro-burner is the critical component of microminiature dynamical system, due to micro- combustion
Burner active combustion space itself is very small, and often in millimeter level range, the fuel residence time is short, while minute yardstick situation following table
Area/volume ratio causes heat loss to dramatically increase into 100 times of increase.So as to, micro-burner combustion instability, flammable range compared with
Small, efficiency of combustion and the thermal efficiency are low, serious to restrict micro-burner technology and microkinetic/electricity generation system development based on burning.By
Contribute to solar-thermal generating system in high face body ratio, so low-grade fever photovoltaic generating system causes the pass of numerous domestic and international researchers
Note.
However, thermal photovoltaic power generation, which is the high-energy photon sent using burner outer wall face, excites photovoltaic cell, only photon
Energy, which is more than battery material band gap, effectively to be excited.According to Planck law, burner wall surface temperature improves, and radiation spectrum is left
Move, i.e., moved to shortwave direction, Net long wave radiation photon increases, and contributes to lifting system efficiency.Meanwhile to extend photovoltaic cell
Service life and generating efficiency are, it is necessary to which temperature uniformity is preferable.It is applied to the burner of thermal photovoltaic power field at present, by device size
Influence small, surface area/volume ratio is big, heat loss is big, energy conversion efficiency is low, can not obtain the burner with higher temperature
Wall；In addition, the micro-scale burner for being commonly used in photovoltaic generation only has a burning gallery, by the shadow of device microscopic dimensions
Ring, burner edge rapid heat dissipation, heat loss are big, and temperature unevenness phenomenon is also more serious, influences the power generation of photovoltaic cell
Efficiency.
The content of the invention
For the disadvantages described above or Improvement requirement of the prior art, it is an object of the invention to provide a kind of burning of multichannel
Device, wherein being mixed by the fuel gas in the structure and its set-up mode of the burning gallery crucial to its, each passage-oxidant
Equivalent proportion of thing etc. is improved, and can effectively solve the problem that microburner rapid heat dissipation, temperature can not be into one compared with prior art
The problem of step improves, and the burner is used for, radiation good to the hull-skin temperature uniformity of photovoltaic power generation apparatus radiated photons
Photon energy more concentrate (photon energy also increases with the rise of burner temperature), the photon of radiation is filled by photovoltaic generation
Put and also greatly improved using the ratio for producing photovoltaic generation effect so that had with the photovoltaic power generation apparatus that the burner is used cooperatively
There is good thermal photovoltaic power generation effect, improve the synthesis transfer efficiency of energy.
To achieve the above object, it is proposed, according to the invention, provide a kind of multicenter combustor, it is characterised in that including multiple
Burning gallery arranged side by side, each burning gallery are respectively provided with identical shape and structure；The center of the multiple burning gallery
Line is parallel to each other and is respectively positioned on same plane；
For any one of burning gallery, which includes first segment passage and second segment passage, and described
One section of passage is connected with the second segment passage；The first segment passage is on the centerline direction perpendicular to the burning gallery
Cross sectional area is less than cross sectional area of the second segment passage on the centerline direction perpendicular to the burning gallery；
The burning gallery is used for burning combustible gas, and the first segment passage is connected by first port with the external world, the first port
For being passed through the fuel gas and oxidant into the burning gallery；Described in the second segment passage is discharged by second port
Fuel gas carries out the material after combustion reaction with the oxidant；
In addition, the spacing in the multiple burning gallery between two neighboring burning gallery center line is equal.
As present invention further optimization, which, which has, is used for photovoltaic power generation apparatus radiated photons
Outer surface, plane of the plane residing for parallel to the center line of the multiple burning gallery where the outer surface.
As present invention further optimization, the length of the burning gallery is 10mm~25mm；It is any one of
Channel cross-section of the first segment passage of burning gallery on the centerline direction perpendicular to the burning gallery is in the multiple burning
The length of Projection Line Segment is 0.8mm~1.5mm in plane residing for the center line of passage.
As present invention further optimization, second segment passage and the first segment passage of any one of burning gallery exist
The area ratio of both channel cross-sections on the centerline direction of the burning gallery is 6.25~1.78；All is described
Section of the first segment passage on the centerline direction perpendicular to the burning gallery is with the burner perpendicular to the burning gallery
Centerline direction on section ratio between two be 0.09~0.33.
As present invention further optimization, for any one of burning gallery, the first segment passage is vertical
In the channel cross-section on the centerline direction of the burning gallery and the second segment passage perpendicular to the center of the burning gallery
Both channel cross-section on line direction shapes are similar, are circle or are polygon；Preferably, the first segment passage and
Channel cross-section of the second segment passage on the centerline direction perpendicular to the burning gallery is rectangle.
As present invention further optimization, the fuel gas is at least one of hydrogen, methane and ethene.
As present invention further optimization, in the multiple burning gallery arranged side by side, the burning at marginal position
The equivalent proportion of the fuel gas and the oxidant in passage is more than described in the burning gallery at centrally located place
The equivalent proportion of fuel gas and the oxidant.
As present invention further optimization, pass through solid dielectric phase between the conduit wall of the two neighboring burning gallery
Even, the solid dielectric is stainless steel, quartz glass or carborundum.
As present invention further optimization, the burner is to be internally formed the multiple combustion in one piece of board-like material
Burn through road.
As present invention further optimization, the board-like material is stainless steel material, silica glass material or carborundum
Material.
By the contemplated above technical scheme of the present invention, compared with prior art, by being used as burning in burner
The burning gallery of room is improved, and can effectively improve the radiometric temperature of burner, and the uniformity of the temperature.
Burner in the present invention uses multi-channel structure, and each burning gallery is respectively provided with identical shape and structure (such as
The correspondence such as first segment passage, the length of second segment passage, cross sectional shape and size is consistent), each burning gallery is equal
Including first segment passage and second segment passage, the cross-sectional sizes of both first segment passage and second segment passage it is different (section with
The centerline direction of the burning gallery is perpendicular).First segment passage is connected with second segment passage, and first segment passage is to second segment
The step that channel transition is formed is (since the area of section of first segment passage is less than the area of section of second segment passage, and combustible gas
Body and oxidant are to lead to second segment passage by first segment passage, are outwards widened equivalent to passage, therefore this transition shoulder
Referred to as sudden expansion step), due to using multiple burning galleries arranged side by side with sudden expansion in burner, sudden expansion step causes in passage
A low speed recirculating zone is formd, plays the role of fixed flame, it is ensured that burning is concentrated near sudden expansion step.First
Projection of the step that Duan Tongdao is formed to second segment channel transition in channel-length direction is shorter, and (projection is shorter, i.e., step is got over
It is mutation, the effect of fixed flame is more notable), mutation is formed especially when first segment passage transits directly to second segment passage
Transition shoulder (channel cross-section of the burning gallery on the centerline direction perpendicular to the burning gallery has and only two at this time
Kind situation) when, the effect for concentration of burning is best.
Burner in the present invention, the second segment passage and first segment passage of any one burning gallery are perpendicular to the combustion
The area ratio of both channel cross-sections on the centerline direction in burn through road is 6.25~1.78, with first segment passage and second segment
Exemplified by the section of passage is circle, for any one burning gallery, a diameter of 0.8mm~1.5mm of first segment passage,
The section of two sections of passages is 2mm；Section of all first segment passages on the centerline direction perpendicular to the burning gallery is with being somebody's turn to do
Section ratio between two of the burner on the centerline direction perpendicular to the burning gallery is 0.09~0.33, is set using above-mentioned
Put, can not only ensure the burning localization effects in each burning gallery, but also the heat distribution effect for ensuring burner entirety can be integrated
Fruit, improves the temperature value and temperature distribution evenness of burner wall.
Multiple burning galleries in the present invention form floor equivalent in a big passage, i.e., in whole burner
Inside form multiple combustion chambers；Further, since being provided with sudden expansion structure in each burning gallery, make each burning indoor
The equal Relatively centralized in primary combustion zone, can make the burner obtain the more uniform, thermal field of temperature higher, promote outside burner
Wall (especially to the use of photovoltaic power generation apparatus radiated photons outer surface) mean temperature raise, and improve at the same time
Burner outer wall face temperature distribution evenness.
Admixture of gas (the i.e. fuel gas and oxygen of different equivalent proportions are preferably distributed in the present invention in multiple burning galleries
The mixture of agent, oxidant can be gaseous oxidants, such as air, oxygen), further increase burner outer wall face temperature
Spend the uniformity of distribution.The equivalent proportion of two wing passages is bigger with respect to the equivalent of intermediate channel, in the whole burner unit interval
It can further improve temperature uniformity during the identical hydrogen of interior consumption.
Pre-mixing gas combustion/oxidant enters burning gallery by first port, the low speed reflux that sudden expansion step is formed in passage
Start to burn at area, form high-temp combustion region.The structure for the similar floor that multiple burning galleries are formed in burner internal, will
At the inverse conduction of combustion zone heat to burner inlet, mixed gas is preheated, it is (especially multiple to help to improve combustion stability
In burning gallery, it is connected between the conduit wall of two neighboring burning gallery by the good solid dielectric of thermal conductivity, is more conducively improved
Hot even results)；Meanwhile the structure of similar floor reduces burner internal effective flowing region area, promotes gas flow rate
Increase, the enhancing of heat convection effect；By setting more burning galleries, thermal current and the contact surface in burner inner wall face are increased
Product, it is possible to increase heat convection effect, and then make burner outer wall face temperature higher.Burner, which integrally uses, has good heat conductive
Material (such as stainless steel) is made, be integrally formed, heat can be promoted to conduct to whole burner, so that burner outer wall face temperature
Degree distribution is than more uniform.
Micro-burner in the present invention can be engaged with any one existing photovoltaic power generation apparatus (i.e. photovoltaic cell),
Applied to low-grade fever photovoltaic generation, the efficiency of low-grade fever photovoltaic generating system, while uniform temperature can be not only lifted to a high degree
Degree distribution can extend battery, and will not increase processing technology difficulty, cost etc..
To sum up, the present invention realizes that each passage separately fires by the way that single burning gallery is changed to multiple small micro-combustion passages
Burn, wall bulk temperature can be improved, while improve temperature distribution evenness.Furthermore, it is possible to different gas are set for each microchannel
Body flow and equivalent proportion, further improve burner outer wall face temperature uniformity, and improve the temperature of wall, contribute to low-grade fever light
Photovoltaic generating system improved efficiency.
Brief description of the drawings
Fig. 1 is the structure diagram of the present invention；
Fig. 2 is the structure diagram of each microchannel in the present invention；
Fig. 3 A are equivalent proportions 0.8, volume flow 100cm3During/s, the temperature of burner outer wall face (Y=0mm) in X direction
Spend distribution map；Fig. 3 B are equivalent proportions 0.8, volume flow 100cm3During/s, burner outer wall face is along Y-direction (X=11mm)
Temperature profile；
Fig. 4 is equivalent proportion 0.8, volume flow 100cm3During/s, each channel allocation difference equivalent proportion of multicenter combustor
When burner outer wall face temperature profile：(a) X=5mm, (b) X=11mm, (c) X=17mm.
The implication of each reference numeral is as follows in figure：1 is the first microchannel (that is, microchannel I), 2 for the second microchannel (i.e.,
Microchannel II), 3 be the 3rd microchannel (that is, microchannel III), and 4 be the 4th microchannel (that is, microchannel IV), and 5 be the 5th microchannel
(that is, microchannel V), 6 be shell.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is 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 long as in addition, technical characteristic involved in each embodiment of invention described below
Not forming conflict each other can be mutually combined.
Embodiment 1
As shown in Figure 1, the present embodiment miniature multi-channel burner is by microchannel I 1, microchannel II 2, microchannel III 3, micro- logical
Road IV 4, microchannel V 5 and shell 6 (that is, for the outer surface of photovoltaic power generation apparatus radiated photons) and form, overall structure
In rectangular-shape.
Microchannel I 1, microchannel II 2, microchannel III 3, microchannel IV 4, V 5 dimensional parameters of microchannel are identical, and central axes are simultaneously
Go and spacing is identical.
Miniature multi-channel burner is made of five micro- column type structure channels that are parallel, arranged side by side and being equally spaced；Often
A burning gallery is respectively provided with identical structure (including dimensional parameters, form parameter etc., keep identical), and burning gallery is length
Straight channel, the centerline parallel of passage are equipped with sudden expansion step in the length direction of passage, each microchannel header.Sudden expansion step
Implementation be：Microchannel first segment inlet diameter for D (i.e. first segment passage, entrance be correspondence first port), second segment
A diameter of D1(i.e. second segment passage), meets D<D1, with this so that microchannel second segment is internally formed low speed, recirculating zone, rise and stablize
Combustion.
In the present embodiment, each microchannel dimensional parameters are as shown in Fig. 2, thin diameter D is 0.8mm, and sudden expansion is from entrance spacing
L1For 5mm, major diameter D1For 2mm, sudden expansion is from exit spacing L2For 20mm.Burner housing 6 is made of stainless steel, shell 6
Overall dimension is long 25mm, wide 11.2mm, high 2.4mm.
XOY coordinate systems are established in the plane in shell 6, wherein, the direction edge of X-axis is in most middle burning gallery
Centerline direction, the origin of X-axis is projected position of the sudden expansion of the burning gallery on the center line, and is directed toward and led to origin
One end of the larger burning gallery of road area of section is as X-axis positive direction；Y-axis passes through origin, and is mutually perpendicular to X-axis；In addition,
Straight line where Y-axis by all burning galleries sudden expansion the shell 6 projection in the plane.
The fuel of the torch can be for conventional gas fuel such as：Hydrogen, methane etc..As shown in Figure 1, gas is premixed
Body (mixture of such as air and hydrogen) uniform cloth, mixed gas of low temperature in I 1- V 5 of microchannel is pre- by outer casing inner wall face
Heat and improve enthalpy, the stability of strengthen burning.High-temperature mixed gas after heated, sudden expansion step is formed in each microchannel
Low speed recirculating zone at start to burn.Fuel combustion discharges heat, and temperature of gas mixture increases, high temperature gas mixture and combustion
Burner outer casing inner wall face heat convection.In view of burner internal flow section reduces with respect to single channel burner, high-temperature gas
Flowing velocity increases, and convection transfer rate increase, strengthens according to formula (1) heat convection effect.Meanwhile inside multicenter combustor
Burn equivalent to single channel 1.23 times of heat exchange area, the increase of heat exchange area equally, can be into one based on formula (1) heat convection
Step enhancing.After high temperature gas mixture and burner housing internal face heat convection, shell is reached heat by conductive force
Outer shell outer wall face, makes outer shell outer wall face have higher temperature distribution.Meanwhile burner housing can be led in gas flow direction
Heat effect, promotes burner housing outside wall surface Temperature Distribution than more uniform.
Q=hA Δs t (1)
In formula (1), Q is the quantity of heat convection, and h is convection transfer rate, and A is heat convection area, and Δ t is heat transfer temperature difference.
Using the embodiment burner as model, simulated, adopted by general CFD software for calculation Fluent 6.3.26
It is fuel with hydrogen/air mixed gas, initial temperature 300K, equivalent proportion 0.8, calculates mixed gas volume flow respectively
Measure as 85,100,115 and 130cm3Combustion case during/s.Table 1 has counted outside wall surface mean temperature, by table 1 as it can be seen that mutually synchronized
Under degree, the outer wall temperature of multicenter combustor will be far above single channel burner, calculate and minimum under operating mode improve 35.8K.
Table 1
Fig. 3 is 100cm3Temperature profile on the axis of burner outer wall face, (a) are axial X-directions during/s, and (b) is transversal
Face Y-direction.By scheming (a) as it can be seen that under single speed, the wall surface temperature of chamber burner first increases along axis direction to be reduced afterwards,
But single channel burner temperature reduces trend and is become apparent with respect to multichannel.The wall surface temperature of multicenter combustor is relatively more
Height, especially downstream area, and Relative distribution is evenly.By scheme (b) as it can be seen that multicenter combustor central area temperature compared with
Height, two side areas temperature are relatively low.Under same speed, the cross-sectional direction temperature of multicenter combustor is higher than single channel
, and temperature curve distribution is more smooth, i.e., the temperature difference is smaller.In 100cm3During/s, the Temperature difference of multicenter combustor is
86.6K, and the up to 107.6K of single channel burner.As it can be seen that the wall temperature of multicenter combustor is not only higher, and Temperature Distribution ratio
It is more uniform.
Radiation energy and radiation efficiency under three kinds of speed are calculated according to formula (2) and (3) respectively, result of calculation is counted in table
In 1.As shown in Table 1, the radiation energy of multicenter combustor is all higher than single pass.Similarity rules are also presented in radiation efficiency, i.e., double
Cavity will be than the slightly higher 100cm of single cavity3During/s, radiation efficiency increases to multichannel from single pass 16.67%
18.84%, accordingly increase by 2.2%.
In formula (2), (3), P is to possess a person, and ε is burner outer wall surface launching rate, and σ is this fence-Boltzmann constant of making a mistake, Aout
It is burner outer wall face area, TwIt is outside wall surface temperature,It is hydrogen quality flow, HcIt is hydrogen high calorific power.
At the same time using the embodiment burner as model, it is 100cm to calculate total volumetric flow rate3During/s, each channel allocation
During different equivalent proportions, burner combustion performance, specific equivalent proportion distribution is as shown in table 2.
Table 2
Fig. 4 shows each X (being respectively 5mm, 11mm and 17mm) side during distribution of multicenter combustor Y-direction difference equivalent proportion
Upward outside wall surface Temperature Distribution.As shown in Figure 4, the central area wall temperature of case1 is higher than case2 and case3, but case1
Both sides wall temperature be minimum.Meanwhile distributed based on different equivalent proportions, the wall temperature curve of case2 and case3 in different X positions
It is all relatively more smooth, especially central area.Since higher equivalent proportion is set, the both sides wall temperature outline of case2 and case3
Higher than case1's.Therefore, Temperature Difference Ratio case1's during multicenter combustor case2 and case3 in the Y direction is small.Such as the institute of table 3
Show, during X=11mm, the temperature difference of case1, case2 and case3 are respectively 86.6K, 72.8K and 68.8K.However, 2 Hes of case
The radiation energy and radiation efficiency of case 3 will be lower slightly than case1's, but the radiation efficiency range of decrease of case 3 is less than 1%.To sum up
It is described, burner outer wall face temperature distribution evenness can be further improved for each channel allocation difference equivalent proportion, and can obtain
Good radiance.
Table 3
Its section of passage in above-described embodiment is circle, and in addition to circle, the section of passage can also use other shapes,
Such as rectangle, regular polygon (such as square, regular hexagon, octagon) polygonal shape.The burning gallery of the present invention is equal
It is divided into first segment passage and second segment passage, passes through sudden expansion transition, first segment passage between first segment passage and second segment passage
Both section and second segment channel cross-section shape is similar, area of section it is of different sizes (by taking rectangular cross-section shape as an example, first
The rectangular section of Duan Tongdao is similar but not exactly the same to both rectangular sections of second segment passage, the aspect ratio ratio phase of rectangle
Together；The diagonal intersection point of the rectangular section of first segment passage and the diagonal intersection point of the rectangular section of second segment passage are respectively positioned on this
On the center line of burning gallery), that is to say, that burning gallery can be divided into front and rear two according to the air flow direction in burning gallery
Section, this two sections of cross sectional shapes perpendicular to axis belong to same class shape, are such as circle, or be rectangle；The section of leading portion
Area is less than the area of section of back segment, forms sudden expansion.The passage of the present invention is hollow structure, it is preferred that perpendicular to channel center
Any one section of the burning gallery of line is central symmetry shape.
The burner can be on one piece of solid material (such as stainless steel materials, quartz glass or carborundum), drill out
One row has the passage of sudden expansion, so that the burner of overall structure form be prepared, the outer surface of the solid material corresponds to
The outer surface of shell.Certainly, the burner in the present invention, which can also be, is initially formed multiple passages with sudden expansion, then again more
Shell is made outside a passage；In this case the heat transfer effect between the burner being prepared its multiple passages and shell
Not as the burner of overall structure form, thermal uniformity effect has declined.In addition, when the equivalent proportion in each burning gallery is equal
When identical, the front end of the first segment passage of each burning gallery can be unified to set a first port, as flammable in the burner
The entrance of gas and oxidant.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., should all include
Within protection scope of the present invention.
Claims (8)
1. a kind of multicenter combustor, it is characterised in that including multiple burning galleries arranged side by side, each burning gallery has
There are identical shape and structure；The center line of the multiple burning gallery is parallel to each other and is respectively positioned on same plane；
For any one of burning gallery, which includes first segment passage and second segment passage, the first segment
Passage is connected with the second segment passage；The passage of the first segment passage on the centerline direction perpendicular to the burning gallery
Area of section is less than cross sectional area of the second segment passage on the centerline direction perpendicular to the burning gallery；It is described
Burning gallery is used for burning combustible gas, and the first segment passage is connected by first port with the external world, which is used for
The fuel gas and oxidant are passed through into the burning gallery；The second segment passage is discharged described flammable by second port
Gas carries out the material after combustion reaction with the oxidant；
In addition, the spacing in the multiple burning gallery between two neighboring burning gallery center line is equal；
The length of the burning gallery is 10mm~25mm；The first segment passage of any one of burning gallery perpendicular to
Projected in the plane residing for center line of the channel cross-section in the multiple burning gallery on the centerline direction of the burning gallery
The length of line segment is 0.8mm~1.5mm；
The second segment passage of any one of burning gallery is with first segment passage perpendicular to the center line side of the burning gallery
The area ratio of both upward channel cross-sections is 6.25~1.78；All first segment passages lead to perpendicular to the burning
Both section and section of the burner on the centerline direction perpendicular to the burning gallery on the centerline direction in road it
Than for 0.09~0.33；
The equivalent proportion of the fuel gas and the oxidant in the burning gallery at marginal position is more than positioned at centre
The equivalent proportion of the fuel gas and the oxidant in burning gallery at position.
2. multicenter combustor as claimed in claim 1, it is characterised in that the multicenter combustor, which has, to be used for photovoltaic generation
The outer surface of device radiated photons, plane where the outer surface is parallel to flat residing for the center line of the multiple burning gallery
Face.
3. multicenter combustor as claimed in claim 1, it is characterised in that for any one of burning gallery, described
Channel cross-section of one section of passage on the centerline direction perpendicular to the burning gallery is with the second segment passage perpendicular to this
Both channel cross-section on the centerline direction of burning gallery shapes are similar, are circle or are polygon.
4. multicenter combustor as claimed in claim 3, it is characterised in that the first segment passage and the second segment passage exist
Channel cross-section on the centerline direction of the burning gallery is rectangle.
5. multicenter combustor as claimed in claim 1, it is characterised in that the fuel gas is in hydrogen, methane and ethene
At least one.
6. multicenter combustor as claimed in claim 1, it is characterised in that between the conduit wall of the two neighboring burning gallery
It is connected by solid dielectric, the solid dielectric is stainless steel, quartz glass or carborundum.
7. multicenter combustor as claimed in claim 1, it is characterised in that the burner is in the inside of one piece of board-like material
Form the multiple burning gallery.
8. multicenter combustor as claimed in claim 7, it is characterised in that the board-like material is stainless steel material, quartzy glass
Glass material or carbofrax material.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610262234.2A CN105864766B (en) | 2016-04-26 | 2016-04-26 | A kind of multicenter combustor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610262234.2A CN105864766B (en) | 2016-04-26 | 2016-04-26 | A kind of multicenter combustor |
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| CN105864766A CN105864766A (en) | 2016-08-17 |
| CN105864766B true CN105864766B (en) | 2018-04-24 |
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| CN108278600B (en) * | 2018-02-08 | 2024-02-09 | 江苏大学 | Combined microscale regenerative burner |
| CN111765457B (en) * | 2020-06-28 | 2023-04-18 | 江苏科技大学 | Combined micro burner using waste heat |
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| 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 |
| CN104578975A (en) * | 2014-12-08 | 2015-04-29 | 天津大学 | Portable power supply device based on micro-combustion |
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