CN101338356B - Heat treating furnace using porous medium combustor - Google Patents
Heat treating furnace using porous medium combustor Download PDFInfo
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- CN101338356B CN101338356B CN2008100126964A CN200810012696A CN101338356B CN 101338356 B CN101338356 B CN 101338356B CN 2008100126964 A CN2008100126964 A CN 2008100126964A CN 200810012696 A CN200810012696 A CN 200810012696A CN 101338356 B CN101338356 B CN 101338356B
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- furnace
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- burners
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Abstract
A heat processing furnace which adopts a porous medium burner belongs to the technical field of heat processing furnace. The furnace includes a hearth body and burners. The burners adopt porous ceramics foam; the burners are arranged on the top part or the side wall of the furnace; the surrounding masonrys of the outlet sections of the burners are designed to be of a gradually expanded horn shape; the crossing line of the extending surface of the outlet sections of two neighboring burners or the crossing line between the extending surface of the outlet sections of the burners and the wall of the furnace wall is arranged above a workpiece to be heated; the heat loss of the wall of the furnace arranged in the mode is less; the radiation heat transmission share is large. The ceramics materials of the burners are cordierite, yttrium oxide-based zirconia, calcium oxide-based zirconia, silicon nitride, aluminum oxide or the ceramics particles bonded by a bonding agent. The burner is formed by one or a plurality of same burning units. The porous medium burner of the invention has the advantages of small size, low manufacture cost, low mounting difficulty, large adjusting ratio, high burning intensity and low contamination discharge. The heat processing furnace has the advantages of high burning efficiency, less heat loss and high heating quality.
Description
Technical field
The invention belongs to the heat treatment furnace technical field, relate to a kind of industrial heat treatment furnace, particularly a kind of heat treatment furnace that adopts porous media combustor.
Background technology
Heat treatment furnace is the basic equipment of metallurgical works and engineering works heat treatment department.It is last procedure in metallurgical and the mechanical processing process.Up to now, heat treatment furnace generally adopts traditional burner, and combustion system mainly is diffusion combustion or premixed combustion.Combustion processes is finished at the burner hearth freeboard, and burning is analysed heat and mainly passed to workpiece by radiation and convection type by flame or high-temperature flue gas; Directly the heat that passes to workpiece by flame radiaton only accounts for several percentage points, and most of radiations heat energy at first arrives furnace wall, and part arrives workpiece through reflection and secondary emission, and part is scattered and disappeared through conduction after the furnace wall absorption inevitably, causes the loss of energy.
No matter be to adopt diffusion combustion or premixed combustion, the flame front thermograde is big, and temperature distribution is very inhomogeneous near it, and the existence in localized hyperthermia district can strengthen N in the combustion air
2Thereby cracking produce NOx; Be difficult to realize perfect combustion, thermo-efficiency is low; And contain CO, CO in the products of combustion
2, pollutent such as NOx, cause gaseous emission to cause pollution behind the atmosphere to environment.
The adjusting of conventional burners can only reach about 3 mostly than little.For geseous fuel of the same race, can improve intensity of combustion by strengthening gas flow, perhaps reduce gas flow workpiece is incubated, if but the gas flow intensity of variation is excessive, and burner just can't be worked; For different types of geseous fuel, fuel type changes, and calorific value also correspondingly changes, the gas flow that burning needs also changes thereupon, and fuel value changes excessive, and gas flow is excessive or too small, the adjusting that surpasses burner is than scope, and burner is cisco unity malfunction then.For example, the burner of burning blast furnace gas just was difficult to natural gas fuel in the past.
In addition, traditional burner volume is big, the structure more complicated, and manufacturing, installation and improvement cost are higher.
Summary of the invention
The present invention provides a kind of heat treatment furnace that adopts porous media combustor in order to overcome the weak point of prior heat treatment stove, and thermo-efficiency improves, and production cost reduces, and the quality of workpiece and output improve, and the quantity discharged of pollutent reduces.Burning is even, and the workpiece internal difference in temperature is little in the heat treatment process.
The technical solution used in the present invention is:
This stove comprises burner hearth main body and burner.The burner hearth main body is made of furnace roof, furnace sidewall, furnace bottom, fire door and exhanst gas outlet etc.Burner adopts the porous ceramics foam, be arranged on roof of the furnace or the side wall, masonry is designed to the hydraucone shape of flaring around the burner outlet cross section, and adjacent two burners are positioned at by the intersection of the intersection of the extended surface in mouth cross section or burner outlet cross section extended surface and furnace wall and are heated above the workpiece.
The material of the pottery of described burner can be used trichroite, yttria-base zirconium white, silicon nitride, aluminum oxide, or with binding agent agglutinating ceramic particle.Described burner is to be combined by one or more identical fuel elements, each fuel element comprises pre-confounding of upstream aperture ceramic foam and macropore ceramic foam combustion zone, downstream, or carry out the transition to the classification grading structure of macropore gradually by aperture, the pre-confounding of aperture ceramic foam is connected with the premix gas input channel of mounted valve, the aperture ceramic foam requires anti-high temperature more than 1200 ℃, and the macropore ceramic foam requires anti-high temperature more than 1500 ℃.The pre-confounding of aperture ceramic foam aperture 50～60PPI, porosity ε 73～85%; Macropore ceramic foam combustion zone aperture 10～20PPI, porosity ε 73～85%.The burner outlet cross-sectional shape can be circle, rectangle or other shapes.Being used for incendiary geseous fuel calorific value variation range is 800～9000kcal/m
3, can be blast furnace gas, coke-oven gas, high coke mixed gas, Sweet natural gas or liquefied gas.Heat treatment furnace can be multiple heat treatment furnaces such as intermittent type or continous way.
The burner body material of heat treatment furnace is the porous ceramics foam, it have high temperature resistant, anti-oxidant, heat resistanceheat resistant is shaken, characteristics such as anticorrosive; And based on the burner of this type of porous ceramics foam materials have the efficiency of combustion height, combustionvelocity is fast, pollutant emission is low, regulate than advantage such as big, that volume is little; Such burner can the combustion heat value variation range at 800～9000kcal/m
3(3344～37620kJ/m
3) even above geseous fuel, as blast furnace gas, coke-oven gas, high burnt platform coal gas, Sweet natural gas, the liquefied gas etc. of mixing.
Two sections of pre-confounding of porous media combustor body portion upstream aperture ceramic foam and macropore ceramic foam combustion zones, downstream mainly rely on the super-thermal insulating burning principle to improve temperature of combustion and speed, and burning is mainly finished in macroporous matrix.Compare with traditional unpolarized burning, the burning in the porous medium is comparatively complete, and most CO are converted to CO
2, the production rate of NOx reduces, the unburned hydrocarbon after the porous media combustor burning, and amount of nitrides is lower than 30ppm, and carbon monoxide content is lower than 10ppm.Burning analyse heat nearly 20% by burner outlet cross section (being generally the plane) with radiation mode output, nearly 80% is exported by the products of combustion enthalpy.And the energy of radiation output can directly reach workpiece surface mostly; Simultaneously, because burning is finished in macroporous matrix substantially, the products of combustion of cross section outlet reaches top temperature (near " heating temp "), this moment flue gas and workpiece temperature difference maximum, thereby strengthen convective heat exchange.This shows, adopt porous media combustor can raise the efficiency and enhancement of heat transfer.
Refractory materials masonry around the burner outlet cross section is designed to the hydraucone shape of flaring, and the intersection of the intersection of adjacent two burner outlet cross section extended surfaces or the extended surface in burner outlet cross section and furnace wall is positioned at and is heated the workpiece top.So, the radiation in burner outlet cross section can directly reach workpiece surface (small amount of attenuation that has the existence because of products of combustion to cause between from the outlet to the workpiece surface) mostly, and, avoid the appearance and the furnace wall thermosteresis in radiation dead band no longer through furnace wall reflection and secondary emission.
At different on-the-spot processing requirements and output requirement, the burner section can be designed to circle, square, rectangle or other shapes, also can be combined into larger-size burner to several fuel elements; Its decoration form can be horizontally, vertical to put or place at an angle with axis; The position is placed on roof of the furnace or burner hearth sidewall according to producing needs.
It is the multiple conventional burners of representative that porous media combustor can substitute with the flat flame burner, therefore be not limited to the use of heat treatment furnace as the porous media combustor of one of content of the present invention, it can also be applicable to other flame furnaces such as various process furnace, soaking pit etc.
Adopt the heat treatment furnace of porous media combustor can substitute multiple heat treatment furnaces such as existing intermittent type that uses geseous fuel (blast furnace gas, coke-oven gas, high coke mixed gas, Sweet natural gas, liquefied gas etc.) and continous way.Thereby reach the effect of save energy and minimizing pollutant emission.
The present invention adopts the geometry parameter value of heat treatment furnace of porous media combustor as follows:
Heat treatment furnace h
1140～300mm; h
2500～800mm;
Burner h
320～50mm; h
425～60mm; A (Φ) 100～240mm;
The pre-confounding of aperture ceramic foam aperture 50～60PPI; Porosity ε 73～85%;
Macropore ceramic foam combustion zone aperture 10～20PPI; Porosity ε 73～85%.
The relevant processing parameter of porous media combustor is as follows:
Combustion gases: blast furnace gas, coke-oven gas, high coke mixed gas, Sweet natural gas, liquefied gas;
Air flow quantity: 10～300m
3/ h (Sweet natural gas is an example);
Gas flow: 1.0～20m
3/ h (Sweet natural gas is an example);
Combustion efficacy: unburned hydrocarbon, amount of nitrides is lower than 30ppm, and carbon monoxide is lower than 10ppm.
The invention has the beneficial effects as follows: compare with conventional burners, the adjusting of porous media combustor is than big (more than 5 times), under the situation that the gas flow variation range changes than big or combustion gas kind, also can work, to adapt to harsher on-the-spot processing requirement.For the porous media combustor of being made up of several fuel elements, the valvular premix gas of each unit connecting band input channel according to processing requirement, can pass through the valve regulated feed rate.The porous media combustor volume is little, low cost of manufacture, and installation difficulty is low, and small and exquisite structure makes it can be arranged in any position of roof of the furnace or sidewall easily.
Description of drawings
Fig. 1 is the structural representation that adopts the heat treatment furnace of porous media combustor;
Fig. 2 is that rectangle outlet burner is vertically arranged synoptic diagram along the furnace superintendent direction;
Fig. 3 is that rectangle outlet burner is along furnace superintendent direction lateral arrangement synoptic diagram;
The porous media combustor synoptic diagram that Fig. 4 is made up of 3 fuel elements;
Fig. 5 is the multi-hole medium combustion modular construction synoptic diagram of two-part.
Among Fig. 1-5,1 porous media combustor, 2 furnace roofs, 3 heat treatment furnace burner hearths, 4 exhanst gas outlets, 5 fire doors, 6 premix gas input channels, 7 valves, the pre-confounding of 8 aperture ceramic foams, 9 macropore ceramic foam combustion zones.
The a-rectangle burner length of side (Φ circular burner internal diameter), h
1-furnace roof thickness, h
2-furnace height, h
3The pre-confounding height of-aperture ceramic foam, h
4-macropore ceramic foam combustion zone height.
Embodiment
With rectangle outlet porous media combustor is example, and the embodiment of the heat treatment furnace that adopts porous ceramics foam burner is described.As shown in Figure 1, heat treatment furnace burner hearth 3 is rectangular structure, burner hearth 3 fronts are equipped with fire door 5,2 is furnace roof, porous media combustor 1 is arranged on the furnace roof 2, in order to make the more characteristic of its radiation output share of porous ceramics foam burner 1 performance under the condition of high temperature, the downward refractory materials masonry in burner outlet cross section is designed to gradually wealthy trumpet type from top to bottom, and the intersection of the intersection of adjacent two burner outlet cross section extended surfaces or the extended surface in burner outlet cross section and furnace wall is positioned at and is heated the workpiece top.Exhanst gas outlet 4 is arranged on burner hearth 3 two side walls, and exhanst gas outlet 4 bottoms are concordant with furnace bottom.Fig. 2,3 has provided two kinds of decoration forms of rectangle outlet porous media combustor 1, and as shown in the figure, the rectangle burner 1 of 6 200 * 600mm is divided into two row, and 3 of every row are vertically placed or laterally placed along burner hearth 3 length directions.Fig. 4 has provided porous media combustor 1 synoptic diagram.Porous media combustor 1 is that foursquare fuel element combines by 3 cross sections.The fuel element upstream is the pre-confounding 8 of aperture ceramic foam, and the downstream is macropore ceramic foam combustion zone 9, connects premix gas input channel 6 on the pre-confounding 8 of aperture ceramic foam.During burner operation, premixed gas enters the pre-confounding 8 of aperture ceramic foam via pipeline 6 and carries out preheating, and the back is in macropore ceramic foam combustion zone 9 internal combustion.On each pipeline 6 valve 7 is housed, in the course of the work, by the flow in regulated valve 7 increases or the minimizing input channel 6, thereby control the thermal load of each fuel element, adding under the little situation of heat, even can close some valves 7 and do not influence the work of other fuel elements, reach the effect of further adjusting thermal load.
Geometrical dimension can the according to the form below value:
| Group value (mm) |
1 | 2 | 3 | 4 | 5 |
| h 1 | 150 | 180 | 210 | 240 | 270 |
| h 2 | 500 | 600 | 650 | 700 | 800 |
| h 3 | 20 | 25 | 30 | 35 | 50 |
| h 4 | 25 | 30 | 40 | 45 | 60 |
| a | 100 | 140 | 180 | 220 | 240 |
| Φ | 100 | 140 | 180 | 220 | 240 |
| Macropore ceramic foam combustion zone stupalith mean |
3 | 2.8 | 5 | 4.5 | 4 |
| Macropore ceramic foam combustion zone stupalith porosity % | 73 | 75 | 80 | 82 | 85 |
| Macropore ceramic foam combustion zone material | Yttria-stabilized zirconia | The stable calcium oxide zirconium white | Yttria-stabilized zirconia | The stable calcium oxide zirconium white | Yttria-stabilized zirconia |
| The pre-confounding stupalith of aperture ceramic foam mean pore size mm | 0.3 | 0.28 | 0.5 | 0.4 | 0.45 |
| The pre-confounding stupalith of aperture ceramic foam porosity % | 73 | 75 | 80 | 82 | 85 |
| The pre-confounding material of aperture ceramic foam | Silicon carbide | Trichroite | Aluminum oxide | Binding agent bonding ceramic particle | Silicon nitride |
Use apparatus of the present invention, specifically be exemplified below:
Select for use steel billet to lie in a horizontal plane on the furnace bottom roll as being heated workpiece, feed premixed gas to each fuel element respectively by pipeline 6, the high-temperature flue gas that burning produces is by convective heat exchange and radiation heat transfer heating steel billet, simultaneously, the outlet 1 of high temperature porous media combustor is by the radiation heating steel billet.
Heating condition
Equivalence ratio 0.75
Burner position furnace roof (laterally placing) along the furnace superintendent direction
Burner outlet cross section thermal load 1704.3kW/m
2
Burner dimensions 200mm * 600mm (6)
Macropore ceramic foam combustion zone material oxidation calcia-stabilised zirconia
The pre-confounding material oxidation of aperture ceramic foam aluminium
Steel billet thickness 110mm
Steel billet leaves furnace bottom height 50mm
Exhanst gas outlet size 220mm * 185mm (12)
The steel billet of heats: initial temperature 300K, through about 85 minutes, hot face temperature can reach 1420K.Rate of heating is fast, and section has a narrow range of temperature, uniformity of temperature profile.
Claims (5)
1. heat treatment furnace that adopts porous media combustor, comprise burner hearth main body and burner, wherein the burner hearth main body comprises furnace roof, furnace sidewall, furnace bottom, fire door and exhanst gas outlet, it is characterized in that burner adopts the porous ceramics foam, burner arrangement is on roof of the furnace or side wall, masonry is designed to the hydraucone shape of flaring around the burner outlet cross section, the intersection of the intersection of the extended surface in adjacent two burner outlet cross sections or burner outlet cross section extended surface and furnace wall is positioned at and is heated the workpiece top, described burner is to be combined by one or more identical fuel elements, each fuel element comprises pre-confounding of upstream aperture ceramic foam and macropore ceramic foam combustion zone, downstream, or carry out the transition to the classification grading structure of macropore gradually by aperture, the aperture ceramic foam requires anti-high temperature more than 1200 ℃, the macropore ceramic foam requires anti-high temperature more than 1500 ℃, the pre-confounding of aperture ceramic foam aperture 50～60PPI, porosity ε 73～85%, described macropore ceramic foam combustion zone aperture 10～20PPI, porosity ε 73～85%.
2. according to the described a kind of heat treatment furnace that adopts porous media combustor of claim 1, the material of pottery that it is characterized in that described burner is with trichroite, yttria-base zirconium white, silicon nitride, aluminum oxide, or with binding agent agglutinating ceramic particle.
3. according to claim 1 or 2 described a kind of heat treatment furnaces that adopt porous media combustor, it is characterized in that described burner outlet cross-sectional shape is circle or rectangle.
4. according to the described a kind of heat treatment furnace that adopts porous media combustor of claim 1, it is characterized in that the geseous fuel calorific value variation range of described burner combustion is 800～9000kcal/m
3, geseous fuel is blast furnace gas, coke-oven gas, high coke mixed gas, Sweet natural gas or liquefied gas.
5. the described a kind of application of adopting the heat treatment furnace of porous media combustor of claim 1 is characterized in that heat treatment furnace is intermittent type or continuous heat-treating drier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100126964A CN101338356B (en) | 2008-08-07 | 2008-08-07 | Heat treating furnace using porous medium combustor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100126964A CN101338356B (en) | 2008-08-07 | 2008-08-07 | Heat treating furnace using porous medium combustor |
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|---|---|
| CN101338356A CN101338356A (en) | 2009-01-07 |
| CN101338356B true CN101338356B (en) | 2010-06-09 |
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|---|---|---|---|
| CN2008100126964A Expired - Fee Related CN101338356B (en) | 2008-08-07 | 2008-08-07 | Heat treating furnace using porous medium combustor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102864288A (en) * | 2011-07-09 | 2013-01-09 | 耿凯 | Novel continuous annealing furnace for non-oxidation burner |
| CN111118264A (en) * | 2020-03-02 | 2020-05-08 | 松山湖材料实验室 | Mesh belt furnace |
| CN112179138B (en) * | 2020-09-23 | 2022-04-05 | 中国科学院金属研究所 | High-efficiency low NOXCombustion heating furnace discharging porous medium |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5522723A (en) * | 1993-07-02 | 1996-06-04 | Franz Durst | Burner having porous material of varying porosity |
| CN2484481Y (en) * | 2001-06-06 | 2002-04-03 | 浙江大学 | Gradual-change porous-medium burner |
| CN2500678Y (en) * | 2001-08-01 | 2002-07-17 | 湖北三峡新型建材股份有限公司 | Crystallizing thermal treatment furnace |
| EP1212258B1 (en) * | 1999-08-23 | 2003-10-01 | SGL Acotec GmbH | Method for a burner and a corresponding device |
| CN101158469A (en) * | 2007-11-06 | 2008-04-09 | 东北大学 | Sectional type porous ceramic dielectric gas fuel combusting device |
| CN201053022Y (en) * | 2007-06-26 | 2008-04-30 | 南京长江工业炉科技有限公司 | Steel cylinder normalizing furnace |
-
2008
- 2008-08-07 CN CN2008100126964A patent/CN101338356B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5522723A (en) * | 1993-07-02 | 1996-06-04 | Franz Durst | Burner having porous material of varying porosity |
| EP1212258B1 (en) * | 1999-08-23 | 2003-10-01 | SGL Acotec GmbH | Method for a burner and a corresponding device |
| CN2484481Y (en) * | 2001-06-06 | 2002-04-03 | 浙江大学 | Gradual-change porous-medium burner |
| CN2500678Y (en) * | 2001-08-01 | 2002-07-17 | 湖北三峡新型建材股份有限公司 | Crystallizing thermal treatment furnace |
| CN201053022Y (en) * | 2007-06-26 | 2008-04-30 | 南京长江工业炉科技有限公司 | Steel cylinder normalizing furnace |
| CN101158469A (en) * | 2007-11-06 | 2008-04-09 | 东北大学 | Sectional type porous ceramic dielectric gas fuel combusting device |
Non-Patent Citations (1)
| Title |
|---|
| 侯根富.多孔介质燃气预混燃烧研究现状与展望.中国土木工程学会燃气分会应用专业委员会2007年年会论文集.2007,(2007),11-15. * |
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