CN1164000A - Low NOx burner - Google Patents
Low NOx burner Download PDFInfo
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- CN1164000A CN1164000A CN 96102934 CN96102934A CN1164000A CN 1164000 A CN1164000 A CN 1164000A CN 96102934 CN96102934 CN 96102934 CN 96102934 A CN96102934 A CN 96102934A CN 1164000 A CN1164000 A CN 1164000A
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- air
- nozzle
- fuel
- burner
- combustion
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- 239000000446 fuel Substances 0.000 claims abstract description 104
- 238000002485 combustion reaction Methods 0.000 claims abstract description 80
- 239000011819 refractory material Substances 0.000 claims abstract description 13
- 239000007921 spray Substances 0.000 claims abstract description 8
- 238000009825 accumulation Methods 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 230000008901 benefit Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 47
- 238000002347 injection Methods 0.000 description 15
- 239000007924 injection Substances 0.000 description 15
- 238000007599 discharging Methods 0.000 description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 238000010304 firing Methods 0.000 description 8
- 238000002156 mixing Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 230000002411 adverse Effects 0.000 description 6
- 239000000567 combustion gas Substances 0.000 description 6
- 239000002737 fuel gas Substances 0.000 description 6
- 238000000605 extraction Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000006722 reduction reaction Methods 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 230000001535 kindling effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000001914 calming effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Images
Abstract
A heat-accumulating and low-NOx burner features that the air nozzle whose spray speed is far higher than fuel nozzle and the fuel nozzle are parallelly arranged but their front ends form a step, that is, the front end of air nozzle is behind the fuel nozzle, and said two nozzles are surrounded by refractory material. Its advantage is lower content of NOx in high-temp and middle-temp combustion areas.
Description
Technical field that the present invention belongs to
The present invention relates to a kind of low NO
xBurner more particularly, the present invention relates to a kind of so low NO
xBurner, this burner not only can be reduced in the NO in its high-temperature area effectively when utilizing high-temperature preheated air to carry out heat-accumulation combustion
xContent, and can be reduced in NO in the temperature area wherein effectively
xContent, described high-temperature preheated air is obtained by gas of discharging by the burning of regenerator and the heat exchange between the combustion air.
Technical background
In the past, in order to reduce the NO in the burner
xContent has two sections methods such as burning of employing fuel as shown in Figure 5.Two sections firing methods of this fuel are at the combustion air A that flows in burner spray orifice 101, divide two sections to supply with primary nozzle 102 and secondary nozzle 103 fuel, forming flame by primary fuel and whole combustion airs when, make the high-temperature combustion gas reaction of a secondary fuel and a flame generation, form secondary flame thus.Near secondary fuel nozzle, because oxygen concentration is lower, the NO in flame
xContent can reduce because of this reduction reaction.Goal of the invention
Yet, in the burner that uses two sections firing methods of this fuel, its injection direction of secondary fuel that forms main flame is almost parallel with flowing to of combustion air, thereby, the poor stability of the secondary flame during low temperature, combustion air must be heated in advance about high temperature more than 1000 ℃, then flame could be stablized.Therefore, the stability of secondary flame when improving low temperature and with the injection direction of fuel when flowing to vertical direction with combustion air, though then flame is stablized, still, local burning takes place, local temperature raises and causes NO
xContent increases.Like this, improve the stability and the reduction NO of flame
xThese two is difficult to content make the best of both worlds.
Therefore, normally, employing is dissolved stove as aluminium, for example, the dissolving of Weir formula reflection-type keeps the thermal source of stove, when operating with the stable lower middle temperature area of temperature that carries out about 700～800 ℃, or when the low temperature of igniting, the bad stability of flame is difficult to carry out two sections firing methods of fuel in the past.
In addition, the problem that also has is, sprays required reasons such as pipeline complexity owing to primary fuel and secondary fuel being divided into two stages, and then except equipment complexity, construction trouble, the cost of equipment will improve, and the requirement in place is also increased.
Purpose of the present invention will be, a kind of small-sized, low NO efficiently is provided
xBurner.
Purpose of the present invention is again, and a kind of so low NO is provided
xBurner, this burner not only can reduce its NO in high-temperature area effectively when utilizing high-temperature preheated air to carry out heat-accumulation combustion
xContent, and can reduce its NO in middle temperature area effectively
xContent, and the having good stability of flame.The technical scheme of invention
For achieving the above object, the present invention is in the buner system of the heat-accumulation combustion type of the combustion air do burning of having used high temperature, nozzle and the nozzle for jetting fuel of its spray speed much larger than the high velocity jet combustion air of fuel be arranged in parallel, and with refractory material the time around the periphery of said nozzle, at the end face of the jet that forms fuel nozzle with form between the end face of jet of air nozzle and form jump, make the end face of fuel nozzle one side protrude in the end face of air nozzle one side.Here, fuel nozzle preferably has the function of auxiliary burner concurrently.
Therefore, at the low NO described in the claim 1 of the present invention
xIn the burner, along the partial combustion air that on the face of formed jump part between the end face of the jet of the end face of the jet of fuel nozzle and air nozzle, flows, spraying near fuel near the jump of a side end face, stably the whirlpool of formation and combustion-air flow adverse current sucks partial combustion gas the flame that becomes kindling material.Again, partly produce negative pressure, cause the recirculation of strong discharge gas, with before fuel gas mixes, suck the gas of discharging, reduce oxygen concentration at combustion air at jump.And at the downside of the end face of burner oil, fuel is inhaled in the air stream of burning usefulness, mixes wherein at any time.
Here, bigger during its volume expansion ratio normal temperature owing to be preheated to the high-temp combustion air of 700～800 ℃ or retrofit more than it, therefore, can be by the retrofit air nozzle, or by the tiny nozzle of employing, so that the flow velocity when low temperature is suitable.Thus, the above-mentioned combustion air that is preheated to high temperature can be sprayed than the fuel and the air of normal temperature with higher high speed.
For example, as the flow velocity ejection of fuel with 20～30m/s, then high-temperature preheated air can the above great flow velocity ejection of 100m/s.For this reason, the gas that burning is discharged by combustion air flow at a high speed consumingly winding go into, oxygen concentration (dividing potential drop) is reduced, simultaneously, fuel is brought in the combustion-air flow, ceaselessly does strong the mixing.Yet combustion air flows its speed higher compared with fuel, and the gas that a large amount of winding go into to discharge before the end face that arrives fuel, and combustion reaction does not take place sharp, and only ignition slowly takes place the superficial layer that contacts with fuel at combustion air.But,, can not produce kind of a fire and a flame yet, and cause stopping working because of the air swirl that between fuel gaseous blast and aerojet stream, takes place even the flow velocity of combustion air is very high, thereby, can keep stable flame.Particularly in the present invention of claim 2, a stable flame forms along the fuel discharging jet, and being inhaled into aerojet with fuel flows a side, can form more stable flame.Have, in combustion reaction, the mobile speed of combustion air is fast again, and sideband is gone into a large amount of discharge gas, and burning is proceeded on the limit, therefore, can promote slower burning.Thereby, mix on the superficial layer that contacts with each other with the combustion air of the high temperature of ejection at a high speed with by the fuel gas than low speed of its suction, burn slowly, simultaneously, form directed strong flame and burning gases stream.
Again, as when igniting, combustion air is the occasion of low temperature, though the flow velocity of combustion air is slack-off, the soakage of discharging gas reduces, because of the temperature of combustion air is low, and the NO that is taken place
xContent is original just few.On the contrary, because oxygen concentration improves, between near fuel injection stream the jet of fuel nozzle and combustion-air flow, can form the kind fire of not blown out, flame stabilization.
Thus, NO in the time of can being formed on high temperature
xContent is low, simultaneously, has the burner of excellent flame holding during low temperature.
In addition, low NO of the present invention
xBurner, near the part the air nozzle of the jet of its close fuel nozzle forms the extension on curved surface or inclined-plane, and the part of burner oil is flowed out in air nozzle one side.At this moment, fuel flows easily in air one side, follows the amount of the fuel gas of air stream, and increases near the fuel supplement amount of the kind fire the fuel injection orifice that occurs in nearly jump part.
Again, at low NO of the present invention
xIn the burner, the jump face between the end face of the end face of the formed refractory material of jet of fuel nozzle and the formed refractory material of jet of air nozzle is done external or intersection with respect to the jet of air nozzle.At this moment since around the jet of combustion air or its jet formed the jump part, this jump part promptly plays compulsory guide effect to the injection direction of combustion air, can form the big combustion-air flow of directionality.So, be accompanied by fuel and pass and to bring to fartherly, form strong flame and the combustion-gas flow of directionality.And, owing to produced negative pressure, can make the recirculation of the discharge gas in the stove stronger in the jump part.The effect of invention
At the described low NO of claim 1
xIn the burner, along the partial combustion air that on the face of formed jump part between the end face of the jet of the end face of the jet of fuel nozzle and air nozzle, flows, spraying near fuel near the jump of a side end face, stably the whirlpool of formation and combustion-air flow adverse current sucks partial combustion gas the flame that becomes kindling material.On the other hand,, produce negative pressure, cause strong waste gas recirculation, with before fuel gas mixes, suck the waste gas of discharge, the reduction oxygen concentration at combustion air in the jump part.And in the downstream of the end face of burner oil, fuel is inhaled into combustion-air flow and follows mixing wherein, therefore, when stable burning slowly takes place, forms strong flame and the combustion-gas flow of directionality.For this reason, when using the combustion air of high temperature, the very high this point of the stability of flame and can suppress NO needless to say
xWhen taking place, forming strong flame and the combustion-gas flow of directionality, thereby, can burn with uniform hot-fluid in the space of broadness.And as when igniting, combustion air is the occasion of low temperature, though the flow velocity of combustion air is slack-off, the soakage of discharging gas reduces, because of the temperature of combustion air is low, and the NO that is taken place
xOriginal just few.On the contrary, because oxygen concentration improves, between near (jet of fuel nozzle) fuel injection stream and combustion-air flow, can form the kind fire of not blown out, flame stabilization.
Have again, occasion in claim 4 of the present invention, when fuel nozzle is also used as auxiliary burner, can form a stable flame by simple structure, and make this flame and fuel be sucked combustion-air flow one side together by way of parenthesis, thereby, even with combustion-air flow and fuel sequential fuel injection, also can form stable flame, increase the soakage that gas is discharged in burning, carry out low NO
xChange.
Said method is under higher high temperature, for example the high temperature more than 1000 ℃ down the iron of operation be low NO in the temperature-rise period of heating furnace etc.
xChange is effective.Yet, for the low NO of nonferrous metal dissolving stove inexecutable in the past, operation at a lower temperature etc.
xStablizing of change and flame, said method is effective especially.
Again, in the occasion of claim 2 of the present invention, fuel flows easily in air one side, follow air stream fuel gas amount and, increase near the fuel supplement amount of the kind fire the fuel injection orifice that occurs in nearly jump part.Therefore, burn more completely can promoting, what prevent CO and HC etc. is free when not firing composition and take place, and can make at order difference part and divide the kind fire that forms stable, improves the stability of flame more.
In addition, occasion in claim 3 of the present invention, since around the jet of combustion air or its jet formed the jump part, this jump part promptly plays compulsory guide effect to the injection direction of combustion air, can form the big combustion-air flow of directionality.Simultaneously,, cause to make the recirculation of discharging gas in the stove owing to produced negative pressure in the jump part.So, fuel can be passed and bring to further flame that the formation directionality is strong and burning gases stream.And, because the negative pressure that jump partly produces makes the recirculation of discharging gas in the stove more powerful.The jet that described jump regards to air nozzle is done when external, the area that sucks because of discharge gas is big, the function that can have the oxygen concentration in the excellent reduction combustion air, again, become almost to coat the occasion of the jet of air nozzle at described jump hand-deliver fork-shaped, because the refractory material pipe fitting that described air nozzle uses, its nozzle segment until the flame front face is suppressed more, can make the strong air jet stream of directionality from flame end face ejection, burning gases have excellent in companion's mixing ability.
Description of drawings
Fig. 1 is explanation low NO of the present invention
xThe general configuration of burner and the schematic diagram of combustion position (A) are longitudinal sectional view, (B) are bottom view.Fig. 2 is for showing low NO of the present invention
xThe bottom view of other embodiment of burner.Fig. 3 is for using low NO of the present invention
xThe schematic diagram of an embodiment of burner.Fig. 4 measures low NO of the present invention for expression
xThe flow velocity of the combustion air in the burner and NO
xThe chart of the relation of content.Fig. 5 represents existing low NO
xThe schematic diagram of burner, general two sections burners of fuel.
Below the best enforcement state of invention, the embodiment shown in describes structure of the present invention in detail with reference to the accompanying drawings.
Fig. 1 has shown low NO of the present invention
xAn embodiment of burner.Should low NO
xBurner system utilizes regenerator and burning to discharge gas, fuel gas and the combustion-air flow that is preheated to high temperature are made the burner of parallel ejection, make air nozzle 1 and fuel (gas) nozzle 2 to be preheated to the combustion air of high temperature much larger than the high speed ejection of fuel, and run through refractory material pipe fitting 3, on two end faces 4,5 of the formation jump of refractory material pipe fitting 3, be penetrated with the jet 6,7 of nozzle respectively.Here, be embedded with conveyance conduit 8 that form to supply with primary air around fuel nozzle 2, around fuel nozzle 2, stream has 10% the primary air that accounts for auxiliary air.Offer jet 9 except main burner 7 at the fore-end of fuel nozzle 2, this jet 9 sprays a part of fuel towards primary air stream all around, and, the design of the fore-end of above-mentioned fuel nozzle 2 can make the part of fuel as auxiliary fuel, after bumping on the tube wall around the pipeline 8, be spread in the stream of primary air, obtain a good mixing state.At the leading section of fuel nozzle, be provided with igniter not shown in the figures, make and in burning, can form a stable flame 12.Pipe-line system only is made of the fuel channel (primary air pipeline 8 and fuel nozzle 2) of flowing through as the trunk line air nozzle 1 of most of combustion air of auxiliary air and flow through fuel and primary air, is a very compact system.
Have again, fuel injection orifice 7 and air jet 6 do not form in one plane, but are located on the different plane that forms jump, and described fuel injection orifice 7 is located at the downside of air jet 6.That is, fuel injection orifice 7 is located on the end face (being designated hereinafter simply as flame front) 5 that protrudes in end face 4, and described 4 for being provided with the end face (being designated hereinafter simply as datum level) of refractory component.Keep stable flame 12 of fuel ejiction opening 7 ejection of face 5 and fuel F by this flame.Combustion air sprays with high speed from the centre of refractory component 3.At this moment, keep at nearly flame near the jump part of face 5,, can stably form the whirlpool 11 of adverse current, mix rapidly, form and keep flame region with fuel, the gas of a part at combustion-air flow.Therefore, needless to say, during low temperature, also can form the stable kind fire of not blown out during high temperature.Air nozzle 1 and fuel nozzle 2 be arranged in parallel and the refractory component 3 that keeps, occasion at present embodiment, for to make integrally formed single piece spare structure, difference according to the field of employment, also can be formed separately part that keeps air nozzle 1 and the part that keeps fuel nozzle 2, be used in combination then.Have, in the present embodiment, air nozzle 1 also be can't help pipeline group and is become, but is made of the burner body that is opened in the hole on the refractory material pipe fitting 3 and is built-in with the refractory material pipe fitting.Certainly, described air nozzle 1 also can be made of pipeline.
When adopting above-mentioned structure, consider the problem that still has on the refractory material pipe fitting 3 on the intensity, between air nozzle 1 and fuel nozzle 2, be necessary to maintain a certain distance.Therefore, in the zone of fuel after just spraying, have and be difficult to be flowed the tendency that is attracted by air at a high speed.So, preferably the air nozzle on the fuel injection orifice 71 part 13 is nearby made as shown in Figure 1, towards the curve form of air nozzle 1 one sides.Thus, can make fuel be easy to flow out to combustion-air flow one side, can improve more fuel with mixing the mixing ability, prevent the free generation of not firing composition of CO or HC etc.In addition, also good for the fuel supply of the whirlpool 11 of the adverse current of combustion air, can form more stable kind fire.The shape of relevant above-mentioned air nozzle portions of proximal also can be not limited to curved surface, gets final product so long as can satisfy the shape of described function, and for example, can be the inclined-plane.
Air nozzle 1 is arranged at flame and keeps on the jump part on border of face 5 and datum level 4.And, make described nearly flame keep the part of face 5 to have with the function of mixing fuel combination; Make nearly datum level 4 have the function that gas is discharged in recirculation.That is, shown in Fig. 1 (B), the center that flame keeps the face 10 of the jump part of face 5 and datum level 4 to make transversal jet 4 is provided with, and makes it with the jet 6 of air nozzle 1 in two, at this moment, opposes each other with companion's mixed function and recirculation function.On the other hand, shown in Fig. 2 (A), the face 10 of jump part is external in setting on the jet 4 of air nozzle 1, at this moment, come compared with the occasion shown in Fig. 1 (B), suck the area of discharging gas and increase, can have the effect of the oxygen concentration of excellent reduction combustion air.Again, shown in Fig. 2 (B), when the face 10 of jump part almost completely coats jet 4 shapes arranged in a crossed manner, coated by refractory component 3 in the air that sprays and block that to keep the part of face 5 to flame more, make the stronger combustion-air flow of directionality keep face 5 ejection from flame, have excellent burning gases with companion's mixing ability.In addition, show two examples among Fig. 2, still, be not limited to these.
Have, combustion air can utilize burning to discharge gas again, for example, but jet preheat to 700～800 ℃ or air of high temperature preheating on this.For example, make burning discharge gas and combustion air, directly carry out heat exchange, can be preheated to the temperature that being close to burning discharge gas thus alternatively by regenerator.Here, though do not express the regenerator body in the drawings, can be loaded in burner body or the connected pipeline by interior, or connect by pipeline.
According to the low NO among the Fig. 1 shown in the structure like this
xBurner, when combustion air with high temperature, when spraying at a high speed, from flame keep face 5 ejections high speed, have direction-sense combustion air and can attract strongly earlier making the fuel of parallel injection than low speed, winding, mix this fuel, do long-range injection.Yet the combustion air flow velocity is much larger than fuel flow rate, and for example, its speed can be up to very high 100m/s, and before it arrived flame maintenance face, winding advanced to discharge gas in large quantities, and therefore, combustion reaction is not rapid generation, but carries out lentamente.Again by, air velocity is fast, then because winding that can be a large amount of in combustion reaction is carried out combustion reaction when advancing to discharge gas, so, can promote to burn more slowly.This point is from the flow velocity and the NO of as shown in Figure 4 combustion air
xThe relation of the generating capacity experimental result of trying to achieve and obvious: the jet velocity of combustion-air flow is big more, then NO
xAmount low more; And, quantity combusted big more (especially true under the high temperature occasion), then its effect is remarkable more.Thereby, according to the burner of the embodiment of the invention, can form comparatively evenly, long-range add hot-fluid, and can realize low NO
xChange.In addition, keep the nearby regional combustion air adverse current that takes place of the jump part of face 5 for flame, after a part of fuel is attracted, do diffusion, mix, become kind of a fire, form stable flame, therefore, much less, begin also can form stable flame during high temperature from low temperature.
Has aforesaid low NO of the present invention
xBurner can utilize the thermal source as the molten slurry stove of nonferrous metal, for example, and as the thermal source of reverberatory furnace.
Low No in the present embodiment
xBurner is one group of buner system 20 of forming a heat-accumulation combustion type with two burners 21,22 of alternate combustion.The buner system 20 of heat-accumulation combustion type is provided with the furnace wall, so that the space segment on the liquid level of the molten aluminum of reverberatory furnace heating clamber forms flame and burning gases.In addition, be the buner system 20 that is provided with a heat-accumulation combustion type in the present invention, still, two groups of above described systems can be set also.
The structure of the buner system 20 of heat-accumulation combustion type and combustion system thereof there is no any special restriction, in the present embodiment, its structure setting as shown in Figure 3, built-in regenerator 23 in burner body 14, after respectively burner 21,22 and regenerator 23 being made one, be combined into a system with these two groups, make its alternate combustion, simultaneously, the discharge gas of burning is discharged by the burner and the regenerator that are in flameout state in alternative combustion process.21,22 designs of being done are to two burners, by a cross valve 26, these two burners can selectively be connected with the gas extraction system 25 of discharging burning gases with the air supply system 24 of supplying with combustion-air flow.Burner 21 (or 22) to one of them is supplied combustion airs by accumulation of heat 23, simultaneously, another burner 22 (or 21) by regenerator, is made it to discharge burning gases.Combustion air can wait with the fan (not shown) of for example calming the anger and supply with, and burning is discharged gas and can for example be used, and the method for exhausting of drawing fan (not shown) etc. is drawn to this gas in the atmosphere from stove.In addition, a part of combustion air is without regenerator 23, and as primary air with fuel from pipeline 8,2 ejections.Again,, can for example pass through triple valve, it alternately is connected with in the burner 21,22 any, supply with fuel though do not express fuel feed system in the accompanying drawing.
Here, regenerator 23,23 is preferably used by the pressure loss is less but thermal capacity is bigger, the material that durability is higher, for example, by the pottery tube structure that form, that have many cellular mesh of cordierite, mullite etc.At this moment, when from burning discharge gas, reclaiming heat energy, be lower than below the dew-point temperature of acid, also can in pottery, collect sulfur-bearing composition and its chemical change material in the fuel even discharge gas, thus, unlikely pipeline etc. in the gas extraction system in road, back is caused cold end corrosion.Certainly, regenerator of the present invention is not limited to these, also can use other the regenerator as Ceramic Balls or nugget material etc.
The molten slurry stove of Weir formula reflection-type according to aforesaid structure, when operating in the middle temperature area about 700～800 ℃, keep on the face 5 near the flame the jump face 10, as resulting from the kind fire of adverse current of combustion air, formed stable flame, simultaneously, discharge gas is burned to suck with the flow at high speed of air stream, thus, oxygen concentration is reduced, and make the burned fuel that sucks with air stream be mixed in do burning slowly in the combustion air slowly.Like this, flame stabilization, NO
xContent does not increase.
On the other hand, burning is discharged in the burner of gas from flame-out by air nozzle 1 and regenerator 23, via gas extraction system 25 discharges.That is, one group of burner 21,22 passes through the switching of cross valve 26, alternately is connected in gas extraction system 25 and air supply system 24, when flame-out, promptly can be used as the passing away that gas is discharged in burning.The molten slurry of aluminium is heated by the radiant heat of flame and burning gases.Here,, supplied with again, therefore, be under the high temperature near effluent air temp because the combustion air that is supplied to burner 21,22 is via with after short time of regenerator 23 direct contacts preheating.Thereby a spot of fuel also can be done stable burning, obtains high-temperature gas.And because of can be along with the increase and decrease of quantity combusted, the temperature of combustion air also can be ensued variation at any time, and the thermoregulator response of molten slurry is good.
Have, burning can have for example 10 seconds～2 minutes interval with the switching of exhaust again, be preferably with 1 minute with interior interval, preferably carry out with about 10～40 seconds extremely short interval.In addition, also can be when the burning gases of discharging via regenerator 23 of discharging reach the temperature of setting, carry out above-mentioned switching when for example reaching about 200 ℃ of left and right sides.At this moment, because the flame burning position is mobile again and again, the heat in the combustion chamber distributes more even, and the minimizing heating is irregular and be incubated irregular.Reach not the fixedly effect of flame from the effect of this burner, can reach the homogenising of temperature in the stove easily.In view of the above, can improve the design temperature in the stove again, increase substantially the radiant heat transfer amount, thereby, improve the thermal efficiency, reduce fuel cost.
Burner according to present embodiment, regenerator 23,23, refractory component 3 and burner body are assembled into as a whole, and wherein pipeline is few, next compared with burner in the past, the burner of present embodiment, its more compact structure, can improve the free degree of its application, in the manufacturing construction, also have the low advantage of cost.Therefore, much less the extensive firing equipment of newly putting is exactly to reclaim in the reducing energy consumption of comparatively difficult small-scale firing equipment in investment in the past, also can solve the problem of investment recovery.
Again, though the foregoing description is an embodiment preferably of the present invention, still, the present invention is not limited to this example, only otherwise break away from main points of the present invention, in this scope, various variations can be arranged.For example, in the present embodiment, just mainly be with low NO of the present invention
xBurner is used for the explanation under the occasion of reverberatory furnace, still, is not limited thereto, though directly heating or indirect, low NO of the present invention
xBurner can be used for all firing equipments.In addition, in the present embodiment, just utilize the regenerator that connects or be built in the burner that the occasion of the combustion air alternate combustion of high temperature has been done main explanation, still, also be not restricted to this.The feed system that also can make regenerator face toward combustion air is done relative rotation with gas extraction system, or by using the pipeline switching device shifter, the flow direction for regenerator of switch fluids, or the like, can utilize the discharge heat of the burning discharge gas of high temperature thus, the combustion air that is preheated to high temperature is supplied to single burner continuously, keeps continuous burning.In the present embodiment, be the pipeline 8 that around fuel nozzle 2, is provided for mobile primary air again,, near jet, to form auxiliary burner, but be not restricted to this, according to the difference of occasion, also auxiliary burner can be placed this nozzle different with fuel nozzle near.Also have, in the present embodiment, do main explanation, still, be not specially limited, also can use liquid fuel as wet goods in this with regard to the occasion of having used gaseous fuel.
Claims (4)
1. low NO
xBurner, it is characterized in that, in the buner system of the heat-accumulation combustion type that the combustion air work that has used high temperature burns, nozzle and the nozzle for jetting fuel of its spray speed much larger than the high velocity jet combustion air of above-mentioned fuel be arranged in parallel, and when enclosing the periphery that places said nozzle with refractory material, between the formation end face of the jet of the formation end face of the jet of fuel nozzle and air nozzle, form jump, make the end face of described fuel nozzle one side protrude in the end face of air nozzle one side, described high-temp combustion alternately improves regenerator and obtains by making burning discharge gas and combustion air with air system.
2. low NO as claimed in claim 1
xBurner, its characteristic be, forms near the extension that the part of air nozzle has curved surface or inclined-plane to form at the jet of described fuel nozzle, and the part of burner oil flows out to air nozzle one side.
3. low NO as claimed in claim 1 or 2
xBurner, its characteristic be, the jump face between the end face of the end face of the formed refractory material of jet of described fuel nozzle and the formed refractory material of jet of air nozzle is external or intersect at the jet of described air nozzle.
4. low NO as claimed in claim 1
xBurner, its characteristic are that described fuel nozzle can be also used as auxiliary burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96102934 CN1099543C (en) | 1996-03-22 | 1996-03-22 | Low NOx burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96102934 CN1099543C (en) | 1996-03-22 | 1996-03-22 | Low NOx burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1164000A true CN1164000A (en) | 1997-11-05 |
| CN1099543C CN1099543C (en) | 2003-01-22 |
Family
ID=5117806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96102934 Expired - Fee Related CN1099543C (en) | 1996-03-22 | 1996-03-22 | Low NOx burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1099543C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102032568A (en) * | 2009-09-30 | 2011-04-27 | 株式会社日立制作所 | Burner for fuel containing hydrogen and method of running low nitrogen oxide (NOx) of same |
| CN102226522A (en) * | 2011-06-01 | 2011-10-26 | 中国科学院广州能源研究所 | Gas burner |
| CN103574600A (en) * | 2012-08-07 | 2014-02-12 | 韩国机械研究院 | Combustion apparatus |
-
1996
- 1996-03-22 CN CN 96102934 patent/CN1099543C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102032568A (en) * | 2009-09-30 | 2011-04-27 | 株式会社日立制作所 | Burner for fuel containing hydrogen and method of running low nitrogen oxide (NOx) of same |
| CN102032568B (en) * | 2009-09-30 | 2014-04-23 | 株式会社日立制作所 | Burner for fuel containing hydrogen and method of running low nitrogen oxide (NOx) of same |
| CN102226522A (en) * | 2011-06-01 | 2011-10-26 | 中国科学院广州能源研究所 | Gas burner |
| CN103574600A (en) * | 2012-08-07 | 2014-02-12 | 韩国机械研究院 | Combustion apparatus |
| CN103574600B (en) * | 2012-08-07 | 2016-03-09 | 韩国机械研究院 | Combustion apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1099543C (en) | 2003-01-22 |
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