CN101158469B - Sectional type porous ceramic dielectric gas fuel combusting device - Google Patents
Sectional type porous ceramic dielectric gas fuel combusting device Download PDFInfo
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- CN101158469B CN101158469B CN2007101579632A CN200710157963A CN101158469B CN 101158469 B CN101158469 B CN 101158469B CN 2007101579632 A CN2007101579632 A CN 2007101579632A CN 200710157963 A CN200710157963 A CN 200710157963A CN 101158469 B CN101158469 B CN 101158469B
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Abstract
The invention relates to a multi-stage multi-aperture ceramic dielectric gas fuel inflamer which includes an inflamer shell, a dust-removing wire netting or a metal brush, an air pipeline, a premixingchamber and a fuel gas pipeline. The invention is mainly characterized in that the inflamer shell is divided into an upper part and a lower part with a multi-aperture plate as a boundary. The inner part of the empty cavity at the upper part of the inflamer shell is sequentially provided with a ceramic multi-aperture dielectric of the large-aperture area which is arranged above a ceramic multi-aperture dielectric of the small-aperture area and the ceramic multi-aperture dielectric of the small-aperture area is arranged on the multi-aperture plate. The dust-removing wire netting or the metal brush is arranged under the multi-aperture plate and in the inflamer shell. The multi-aperture plate is imbedded into the middle of the upper and lower parts of the inflamer shell. The surrounding of the multi-aperture plate extends to the outside of the inflamer shell. The invention has the advantage that the multi-stage multi-aperture ceramic dielectric gas fuel inflamer has a higher thermal valuerange, thereby both the gas of a low thermal value or bum gas fuel and the gas of a higher thermal value can be burnt. The multi-aperture plate added in the inflamer has played a good role of radiating and can effectively prevent backfire or explosion.
Description
Technical field
The present invention relates to a kind of burner, be specifically related to a kind of sectional type porous ceramic dielectric gas fuel combusting device.
Background technology
At present, the burning of gaseous fuel mainly is to be the space combustion of feature with the free flame in China's industrial production, near the steep and skewness of the thermograde this combustion system, flame front, and the existence in localized hyperthermia district has caused a large amount of NO
XGenerate, incomplete combustion and the thermal efficiency is low, combustion stability is relatively poor.Now, the technology that adds porous media in burner is now progressively paid attention to by people.Premixed combustion in the porous media has many good qualities: the less poor combustion limit, higher burn rate and stability, load regulation range is wide, combustion intensity is high, the burner volume is little etc., and the content of pollutant such as nitride and sulfide composition is considerably less in the combustion product, therefore, the premixed combustion in the porous media has very big potentiality in real world applications.
In the burning of gaseous fuel, the material behavior aspect, characteristics such as that porous media must have is high temperature resistant, anti-oxidant, easy heat conduction, stainless steel, alloy, glass, pottery etc. all Ceng Zuowei research object are on probation by Chinese scholars.Configuration aspects, when the aperture was relatively large, radiation effects penetrated more far-reachingly, and temperature raises very fast; The aperture relatively hour, the optical thickness that porous media is relative is bigger, has good accumulation of heat effect.In order effectively to utilize the influencing characterisitic of pore size to burning, people adopt the porous media of non-single aperture, homogenous material mostly.As denomination of invention is that " a kind of metallic fiber---porous ceramic media surface burner " (application number is 200610135085.X, applying date 2006.12.27) the disclosed burner of patent application, its formation comprises in the cavity of burner housing, burner tubes, air duct, shell formation, set gradually metal fiber medium in the combustion zone from top to bottom, ceramic dielectric in the preheating zone, in the preheating zone, under the ceramic dielectric, be provided with dedusting wire netting or metallic brush in the cavity of gas pipeline top.Though the burner of this structure, has solved burner than the Metal Fibre Combustion device tempering phenomenon takes place easily in use, and the adjustable range of fuel and air is little, the problem that the thermal efficiency is low.But, still there is following defective in this porous media combustor use: the porous media aperture is very little, be very easy to block, so present most of burner only is used for single pure gaseous fuel, and great majority need higher coal gas of combustion ash dust content or mixed gas in the actual production, and this brings limitation for the practical application of porous media combustor.
Summary of the invention
Weak point at existing gaseous fuel porous media combustor the invention provides a kind of sectional type porous ceramic dielectric gas fuel combusting device, and this burner can be used for the combustion heat value excursion at 1000～10000kcal/m
3(4180～41800kJ/m
3), even higher gaseous fuel, can more effectively prevent tempering and blast simultaneously.
The formation of burner of the present invention comprises burner housing, dedusting wire netting or metallic brush, air duct, premixer and gas pipeline, the cavity inside that burner housing constitutes is provided with big bore region ceramic porous medium, dedusting wire netting or metallic brush are assemblied in the premixer of burner housing bottom, and main points are that the shell of burner is that the boundary divides upper and lower two ones with the porous plate.The cavity inside that burner housing top constitutes, be disposed with big bore region ceramic porous medium from top to bottom, big bore region ceramic porous medium is placed on above the orifice region ceramic porous medium, the orifice region ceramic porous medium is placed on above the porous plate, is cavity between the top and burner housing top end face of big bore region ceramic porous medium; Porous plate is clipped in the middle of the burner housing upper and lower part, and the porous plate periphery extends to the burner housing outside space.
Big bore region in the burner belongs to the combustion zone, and the porous media material of use is a pottery, to be suitable for high heating value gaseous fuel (ignition temperature can reach 1500 ℃, even more than); The orifice region aperture is less, can play the effect that prevents tempering, and orifice region is the preheating zone simultaneously, can effectively store the heat that the combustion zone produces, and the temperature here generally is no more than 1200 ℃, and the porous media material of use also is a pottery.In order to guarantee heat-conducting effect good between two zones, be designed to the two and be in tight contact condition.The orifice region ceramic porous medium is placed on the porous plate.The porous plate thermal conductivity is stronger, can derive heat rapidly, can prevent in combustion process, because misoperation or other reasons cause the generation of tempering.
The material of above-mentioned big bore region ceramic porous medium is selected yttria-base zirconia, calcium oxide-based zirconia or carborundum for use, and average pore size is 2.5～5mm, and porosity is 80～85%, and the arrangement mode in hole is for straight-through or unordered; The material of orifice region ceramic porous medium is selected corundum (Al for use
2O
3), calcium oxide-based zirconia or carborundum, average pore size is 0.25～0.5mm, porosity is 75～83%, the arrangement mode in hole is for straight-through or unordered; Porous plate selects for use heat conductivility good, the metal or alloy material of ability uniform temperature (＜600 ℃).Aperture on the plate is 2～5mm, and porosity is 80～90%, and the arrangement mode in hole is a through type.The hole of porous plate is the orthogonal arrangement mode or circularizes arrangement around the center.Dedusting wire netting or metallic brush material selection stainless steel.Burner housing material selection stainless steel, cast iron or high temperature resistant stainless steel.
The burner housing axial cross section is circle or polygon.
The present invention compared with prior art, Tu Chu characteristics and significant effect are the most: because the present invention has increased porous plate in burner structure, metal or alloy good by heat conductivility, the certain high temperature of ability (＜600 ℃) processes, and porous plate is after assembling, and its periphery is to extend in the burner housing outside.When flame during to the burner propagate upstream, the heat that flame carries can be delivered to the burner outside rapidly by the good porous plate of heat conductivility, is lost in the environment.There is anti-backfire or blast more effectively in aperture on the plate, has greatly improved the safety coefficient of burner application.
In addition, what adopted the combustion zone of the present invention design and preheating zone is ceramic porous medium, and the burner fuel thermal value range is bigger like this, both can lower heat of combustion gas or gaseous fuel inferior, the high heat value gas that can burn again, calorific value generally can be at 1000～10000kcal/m
3(4180～41800kJ/m
3), even higher gaseous fuel, as fuel such as blast furnace gas, coke oven coal or height, burnt mixed gas, natural gases, the present invention can be widely used in industries such as metallurgy, chemical industry, the energy.
Description of drawings
Fig. 1 is the axial section view of burner of the present invention;
Fig. 2 is a kind of form of the A-A of Fig. 1 to cutaway view, and the spread pattern in hole is an orthogonal arrangement;
Fig. 3 is the another kind of form of the A-A of Fig. 1 to cutaway view, and the spread pattern in hole is an annular array;
Among Fig. 1,2,3: 1 burner housing, 2 big bore region ceramic porous mediums, 3 orifice region ceramic porous mediums, 4 porous plates, 5 dedusting wire netting or metallic brush, 6 air ducts, 7 premixers, 8 gas pipelines, 9 flanges, 10 nuts, 11 bolts, 12 screws.
The specific embodiment
Example 1, as shown in Figure 1 and Figure 2, burner is by burner housing, big bore region ceramic porous medium, orifice region ceramic porous medium, porous plate, dedusting wire netting, air duct, premixer, gas pipeline formation.Burner housing is that the boundary divides upper and lower two parts with the porous plate, the cavity inside that burner housing top constitutes, what from top to bottom set gradually is big bore region ceramic porous medium, be placed on above the orifice region ceramic porous medium below the big bore region ceramic porous medium, the two is in tight contact condition.Be placed on above the porous plate below the orifice region ceramic porous medium, be in tight contact condition.Between the top and burner housing top end face of big bore region ceramic porous medium is cavity.Porous plate is clipped between the burner housing upper and lower part, connects by the flange on the burner housing upper and lower part, bolt.The porous plate periphery extends in the burner housing outside space, and mid portion is the perforated plate face in the porous plate periphery.The dedusting wire netting that adopts stainless steel to make embeds in the burner housing lower inner wall face groove, and its position is below porous plate, in the premixer in the burner housing more than the air duct.Air duct is welded on the sidewall of burner bottom, and the burner housing lower port is a fuel gas inlet.
Above-mentioned big bore region ceramic material is selected the yttria-base zirconia for use, and average pore size is 5mm, and porosity is 80%, and the arrangement mode in hole is unordered formula; The orifice region ceramic material is selected corundum (Al for use
2O
3), average diameter is 0.5mm, and porosity is 76%, and the arrangement mode in hole is unordered formula.Porous plate material is selected metallic copper for use, and average pore size is 5mm, and porosity is 82%.The hole be arranged as the through type arrangement that is orthogonal.The shell axial cross section of burner is circular, its material selection stainless steel.
Use burner of the present invention, after air and combustion gas are entered from air duct and gas pipeline respectively, in the premixer, mix, after the dedusting of dedusting wire netting, by porous plate, enter aperture medium in the lower preheating zone of temperature, enter macroporous matrix internal combustion in the combustion zone then.
Burning gases are blast furnace gas, and gas flow is 1500m
3/ h, air mass flow is 220m
3/ h.Combustion efficiency is: air fuel all need not enter the burner preheating; In the gas after the burning, unburned hydrocarbon, nitride, sulfide content are lower than 50ppm, and carbon monoxide is lower than 40ppm.
Example 2:
The structure of burner is identical with example 1.Difference is: big bore region ceramic material is selected calcium oxide-based zirconia for use, average pore size 4mm, and porosity is 85%, the arrangement mode in hole is a lack of alignment; The orifice region ceramic material is calcium oxide-based zirconia, and average pore size is 0.4mm, and porosity is 80%, the hole be arranged as lack of alignment; Porous plate material is selected the mild steel alloy for use, and average pore size is 4mm, and porosity is 83%.The through type that is arranged as in hole circularizes arrangement around the center.The burner housing axial cross section is a square, its material selection cast iron.The premix indoor set be the stainless steel dedusting metallic brush.
Burner application: burning gases are coke-stove gas, and gas flow is 800m
3/ h, air mass flow is 1500m
3/ h.Unburned hydrocarbon, nitride, sulfide content are lower than 50ppm in the gas of burning back, and carbon monoxide is lower than 40ppm.
Example 3: burner structure is identical with example 2.Difference is: big bore region ceramic material is selected carborundum for use, orifice region ceramic material carborundum, and porous plate material selects metallic aluminium, average pore size 3mm, porosity is 84%.The burner housing axial cross section is a hexagon, its material selection high temperature resistant stainless steel.
Burner application: burning gases are that natural gas, gas flow are 2000m
3/ h, air mass flow is 3000m
3/ h.Combustion efficiency is with example 2.
Example 4: the average pore size of big bore region ceramic material is 3mm in the burner, porosity 84%, and orifice region ceramic material average pore size is 0.3mm, porosity 82%, porous plate average pore size 2mm, porosity 86%.Other structures of burner, the selection of member and application result are all identical with example 1.
Example 5: the big bore region ceramic material of burner average pore size is 2.5mm, porosity 85%, and the orifice region ceramic material is elected zirconium nitride as, and average pore size is 0.25mm, porosity 83%.Other structures of burner, the member selection, all identical with example 1.Burning gases are selected liquefied gas for use in the application, and other are identical with example 1.
Example 6: the average pore size of big bore region ceramic material is 2.5mm in the burner, porosity 85%, and orifice region ceramic material average pore size is 0.25mm, porosity 83%, porous plate average pore size 2mm, porosity 86%.Other of burner constitutes all with embodiment 1.
Claims (4)
1. sectional type porous ceramic dielectric gas fuel combusting device, constitute and comprise burner housing, dedusting wire netting or metallic brush, air duct, premixer and gas pipeline, the cavity inside that burner housing constitutes, be provided with big bore region ceramic porous medium, dedusting wire netting or metallic brush are assemblied in the premixer, burner housing bottom, it is characterized in that burner housing is on the boundary divides with the porous plate, following two parts, the cavity inside that burner housing top constitutes, be disposed with big bore region ceramic porous medium from top to bottom, big bore region ceramic porous medium is placed on above the orifice region ceramic porous medium, the orifice region ceramic porous medium is placed on above the porous plate, above the big bore region ceramic porous medium and be cavity between the burner housing top end face; Porous plate is clipped in the middle of the burner housing upper and lower part, and the porous plate periphery extends to the burner housing outside.
2. by the described sectional type porous ceramic dielectric gas burner of claim 1, the material that it is characterized in that big bore region ceramic porous medium, select yttria-base zirconia, calcium oxide-based zirconia or carborundum for use, average pore size is 2.5～5mm, porosity is 80～85%, and the arrangement mode in hole is for straight-through or unordered; The material of orifice region ceramic porous medium is selected corundum (A1 for use
2O
3), calcium oxide-based zirconia or carborundum, average pore size is 0.25～0.5mm, porosity is 75～83%, the arrangement mode in hole is for straight-through or unordered; The material selection metal or alloy of porous plate, aperture are 2～5mm, and porosity is 80～90%, and the arrangement mode in hole is a through type.
3. by claim 1 or 2 described sectional type porous ceramic dielectric gas burners, the hole that it is characterized in that porous plate is the orthogonal arrangement mode or circularizes arrangement around the center.
4. by the described sectional type porous ceramic dielectric gas burner of claim 1, it is characterized in that described burner housing axial cross section is circle or polygon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101579632A CN101158469B (en) | 2007-11-06 | 2007-11-06 | Sectional type porous ceramic dielectric gas fuel combusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101579632A CN101158469B (en) | 2007-11-06 | 2007-11-06 | Sectional type porous ceramic dielectric gas fuel combusting device |
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| Publication Number | Publication Date |
|---|---|
| CN101158469A CN101158469A (en) | 2008-04-09 |
| CN101158469B true CN101158469B (en) | 2010-06-02 |
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|---|---|---|---|
| CN2007101579632A Expired - Fee Related CN101158469B (en) | 2007-11-06 | 2007-11-06 | Sectional type porous ceramic dielectric gas fuel combusting device |
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Cited By (2)
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|---|---|
| CN101158469A (en) | 2008-04-09 |
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