CN1130539C - Reverberatory melting keeping furnace - Google Patents
Reverberatory melting keeping furnace Download PDFInfo
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- CN1130539C CN1130539C CN96102933A CN96102933A CN1130539C CN 1130539 C CN1130539 C CN 1130539C CN 96102933 A CN96102933 A CN 96102933A CN 96102933 A CN96102933 A CN 96102933A CN 1130539 C CN1130539 C CN 1130539C
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Abstract
The present invention relates to a reflective fusion keeping furnace. The present invention utilizes a pair of burners as heating sources, that is to say, an opening is arranged on the diameter expansion part of a burner watt barrel, and the diameter of the opening is larger than that of an air ejection port for high temperature preheating. Fuel is ejected along the periphery of air flow for combustion from the diameter expansion part. A high-speed air nozzle for combustion and a fuel nozzle are arranged in mutual parallel. Fire-proof materials surround the nozzles. Steps are arranged among end surfaces forming the ejection port, and the end surface at the side of the fuel nozzle extends forwards. The pair of burners alternately burn, generate flame with unfixed positions, can uniformly heat the inner part of the furnace, decreases NOx, and improves thermal efficiency.
Description
Relate to the field
The present invention relates to the maintenance of the fusion of nonferrous metal or liquation or fuse the reverberatory melting keeping furnace that keeps with liquation simultaneously.Or rather, the present invention relates to as the burner of reverberatory melting keeping furnace heating source and the attached heat storage and the improvement of combustion method and control method.
Background technology
Shown in Figure 12 as described later, in traditional reverberatory melting keeping furnace, adopt diffusion burner 102 continuous, constant burning as heating source is general, for carrying out roasting, the central portion of aluminum melt is arranged on the body of heater 101.And, control by being used for the quantity combusted that the control signal control of spontaneous combustion load governor 107 is arranged on 105, the 106 pairs of burners 102 of flow control valve on combustion air feed system 103 and the fuel feed system 104, with temperature in the stove so that set point of temperature is set, adjusted to the aluminum melt temperature.On the other hand, scavenger fan 109 and exhaust damper 110 are set on the gas extraction system 108 of calciner 101, remain the furnace pressure setting certain by the aperture (switching degree) of adjusting exhaust damper 110 with furnace pressure controller 111.Therefore, in the occasion of using traditional diffusion burner 102, because be continuous, constant burning, make the furnace pressure change very little, therefore, only, the air door 110 of gas extraction system 108 is controlled, can furnace pressure fully be controlled with controller by detecting furnace pressure, it being remained certain value.
Yet, the central portion of aluminum melt is along oblique heating, inhomogeneous because of hot-fluid because for carrying out roasting in above-mentioned traditional reverberatory melting keeping furnace, easily make the non-uniform temperature of aluminum melt.In addition, in the common diffusion flame burning that with the excess air is prerequisite, because of the residual oxygen in the burning gases causes a large amount of scaling loss.In addition, also owing to the burning gases that diffusion burner 102 is taken place are discharged same as before, and there is the problem that delivery temperature improves, the heat extraction loss increases that makes in continuous constant burning.
Be to reduce the heat extraction loss, in the past, generally carry out recuperation of heat with storage heater etc.But, because traditional storage heater can not at high temperature use,, must below the heat-resisting allowable temperature of storage heater, carry out recuperation of heat because of air is sneaked in the exhaust, existence can only obtain the heat extraction rate of recovery problem below 50%.Therefore, there is the problem that the fusion cost is improved.For this reason, present inventor etc. once considered to utilize heat storage that combustion air is preheated to high temperature near delivery temperature, reclaimed and carry out high efficiency heat extraction.Generally, carrying out the heat-accumulation combustion occasion, NOx increased when the burning preheated air temperature becomes high temperature.In addition, because the reactivity height, even low air ratio also can fully be burnt, although can burn under reducing atmosphere, yet its opposite one side produces a large amount of HC, CO when the reduction burning.For these harmful exhaust gas compositions are reduced, and stopped improvement to conventional burners basic structure.For example, for reaching the NOx that reduces in the diffusivity burner, employing fuel two-stage combustion method as shown in figure 13 etc.This fuel two-stage combustion method is exactly the combustion air A that relatively flows through in the burner trunnion 201, fuel is supplied with primary nozzle 202 and 203 fens two-stages of secondary nozzle, when forming a flame, form secondary flame with the reaction of the high-temperature combustion gas of secondary fuel and a flame with the combustion air of primary fuel and full dose.Because the concentration of oxygen is low near the secondary fuel nozzle, can the NOx in the flame be reduced with reduction reaction.
Yet, in the burner of this fuel two-stage combustion method, the almost parallel that flows to owing to injection direction that makes the secondary fuel that forms main flame and combustion air, the poor stability of the secondary flame when making low temperature, high temperature as if combustion air being preheated to more than 1000 ℃ can make flame instability.Therefore, when the stability of the secondary flame when improving low temperature, and make flame stabilization when making injection direction approach the direction vertical, but cause that partial combustion and local temperature raise, NOx is increased with combustion-air flow.And the occasion that the reverberatory melting keeping furnace that lower mesophilic range about 700-800 ℃ is carried out specified operation uses as heating source, or at the low temperature situation that carries out this stove is lighted etc., the stability of flame is degenerated, traditional fuel two-stage combustion method is difficult to carry out.In addition, the HC, the CO that produce when the reduction burning can not be fully suppressed.
In addition, in traditional reverberatory melting keeping furnace, owing to have aluminium humite or flux powder etc. to sneak in exhaust, the exhaust damper 110 in gas extraction system 108, storage heater (not shown), scavenger fan 109 etc. are gone up and are produced adhering to of these dust mostly, make troubles to operation.
In addition, frequent transitions flows to and carries out the heat-accumulation combustion occasion at short notice, can not evenly heat heat storage, and making near stove one side becomes high temperature, becomes low temperature at the position of close switching valve one side relative with it.Being 1000 ℃ in stove one side for example, is 200 ℃ in valve one side.Owing to follow the big like this temperature difference, make material as heat storage can only be limited to use and have expensive material high temperature resistant, resistance to sudden heating.And, using ceramic honeycomb heat storage occasion, must be the material that can make different shape.In addition, for example, utilizing the flux occasion as the aluminium calciner, also must be the material that possesses corrosion resistance.The material that obtains to possess high-quality like this requirement is very difficult.
In addition, in the furnace pressure control of traditional reverberatory melting stove, carrying out short time alternate combustion occasion, because of not following the tracks of furnace pressure control, follow the furnace pressure change and cause door (pushing off the slag door etc.) rock and hot blast flows out the problem that produces thermal efficiency decline in fresh air or the stove because of sucking.
Summary of the invention
Therefore, the object of the invention is to provide that the generating capacity that can make NOx is few, efficient is high and the reverberatory melting keeping furnace of homogeneous heating.
In addition, further purpose of the present invention is to provide and can not only reaches low NOxization by burner configuration, and more can carry out the reverberatory melting keeping furnace that harmful exhaust gas compositions such as NOx, CO, HC purify.In addition, also to make the reverberatory melting keeping furnace that reliability improves when carrying out heat-accumulation combustion under high temperature, corrosive environment be purpose to provide in the present invention.And then the object of the invention also is to provide furnace pressure equable reverberatory melting keeping furnace.
For achieving the above object, reverberatory melting keeping furnace of the present invention, use heat-accumulation combustion type burner as heating source, described burner use is burnt through the combustion air that burning and gas-exhausting is preheated to high temperature, it is characterized in that, described burner has the nozzle for jetting fuel of configured in parallel and with the nozzle of the described combustion air of high velocity jet of 100m/s at least, center on these nozzles with refractory material, simultaneously ladder is set forming fuel nozzle jet end face and form between air nozzle jet end face, and the end face that makes fuel nozzle one side stretches out more forward than the end face of air nozzle one side.
In this occasion, part along the moving combustion air of the surface current of the step portion of ejection combustion air end face and ejection fuel end face stably forms the reverse vortex that relative combustion flows with air near the ladder near ejection fuel end face, the part of fuel gas is involved in and forms the flame that becomes kindling material.In addition, the negative pressure that produces in step portion causes powerful exhaust gas recirculatioon, thereby before combustion air and fuel gas mix, exhaust is involved in the concentration that makes oxygen reduces.And, in the downstream of burner oil end face, follow burned stream of fuel to attract then to mix with air.
Here, because being preheated to about 700-800 ℃ or higher high-temp combustion compares during with normal temperature with air, its volumetric expansion by air nozzle being set very thin or being adopted and set the thin nozzle that flow velocity is used when being suitable for low temperature for, makes it to compare very high high speed ejection with air with normal temperature fuel.For example with the fuel of the flow velocity of 20-30m/s ejection compare, high-temperature preheated air is sprayed with the high flow velocity more than the 100m/s.Therefore, with air stream burning and gas-exhausting is involved on the one hand, the concentration (dividing potential drop) of oxygen is descended with high-velocity combustion, also follow on the other hand fuel burned attract, be involved in gradually in the air stream with air stream mix.And, because the flow velocity of combustion air is far above the flow velocity of fuel stream, and spraying end face until arriving fuel, is involved in a large amount of exhausts, make the combustion reaction that causes inviolent, cause at combustion air and the fuel superficial layer that contacts and carry out smoulder.Because of forming a stable flame, can be formed on stable flame also not flame-out under the high flow rate.In addition, in combustion reaction, also, more promote smoulder because the flow velocity height of combustion air makes combustion reaction continue when exhaust is involved in a large number.Therefore form the flame and the combustion-gas flow of high directivity.
In addition, as the low occasion of combustion air temperature such as when lighting stove, the exhaust amount of being involved in is reduced, yet, because the combustion air temperature is low, make the NOx and the same the lacking originally of generation.Otherwise,, the stable kindling material that forms between near fuel stream of fuel nozzle jet and the combustion-air flow is not blown out, and formed stable flame because the concentration of oxygen increases.
Therefore, the invention described above since at least two burners of more satisfactory configuration as a pair of heating source, make the burning that hockets form the revocable flame in position, to evenly heating in the stove, and then position by this a pair of burner is arranged to abut mutually, make combustion air with the high velocity jet of 100m/s at least, can prevent to form the flame and the burning gases of short distance.In this occasion, owing between at least one pair of burner, alternately form flame and burning gases at short notice, thus make flame location unfixing, carry out the heating of heating object with uniform hot-fluid.In addition, owing to form the flame and the combustion-gas flow of high directivity,,, can make combustion gas arrive each corner of stove and after heating, carry out exhaust because of preventing short distance even a pair of burner configuration is become to abut mutually with the combustion air of high velocity jet.
In addition, reverberatory melting keeping furnace of the present invention has: the pressure electric converter that detects furnace pressure; To burning conversion detect, with the sensor of output burning switching signal; According to from the signal of pressure electric converter and to the switching of gas extraction system, be the main air door that extraction flow is controlled; The bypass of this air door; Be set in the bypass, according to the burning switching signal and to the switching of this bypass, be the bypass air door that extraction flow is controlled, can follow with the switching correspondence of bypass stream and frequently carry out the little furnace pressure change that the burner conversion causes, with the switching of carrying out the main exhaust system corresponding to the above big change of setting value, thereby absorb the furnace pressure change.In this occasion, owing to when carrying out burner combustion conversion, temporarily open the bypass air door, the capacity of exhaust in the stove is increased, can make and follow the furnace pressure change in the frequent cycle that the burner conversion causes to be suppressed.
In addition, reverberatory melting keeping furnace of the present invention uses the high-temperature preheated air formation reducing atmosphere that is roughly below the theoretical air requirement (making the necessary minimum air capacity of fuel completing combustion in the gaseous mixture) that heating object is heated.In this occasion,, can not make the heating object oxidation owing to cause that with the high-temperature preheated air near the burning and gas-exhausting temperature of being preheated to below theoretical air capacity roughly the reduction burning heats.
In addition, reverberatory melting keeping furnace of the present invention carries out the preheating of combustion air by the heat storage that allows combustion air and burning and gas-exhausting alternately pass through, and is divided into a plurality of parts to the flow direction of this heat storage longshore current body of major general.In this occasion, because going back streamwise at least cuts apart, even for improving the thermal efficiency, making the position of a side in close the stove of heat storage and the bigger temperature difference of generation between the position of close switching valve one side of this position opposition side by the heat-accumulation combustion that allows the combustion air alternating current of the burning and gas-exhausting of high temperature and low temperature cross at short notice, because of the thermal expansion difference of each heat storage is little, thereby can prevent to break.And then, the part of the interior side of close stove of this heat storage of cutting apart is formed by different materials with the part of changing a side near stream, like this, between near a side in the stove and an opposite side, produce the occasion of the big temperature difference with it, can only near the heat storage of a side in the stove, adopt to have stable on heating heat storage, and not have stable on heating heat storage cheaply in the switching valve one side employing of low temperature.In addition, the part of a side in the close stove of heat storage and the part of close stream switching mechanism one side are formed different structures, in this occasion, can make the heat storage employing of the initial interior side of stove that contact with the burning and gas-exhausting that contains high temperature such as dust have the heat storage of filtering function, can prevent that heat storage is blocked etc.And then, make on this is divided into the heat storage of a plurality of parts, to have the exhaust gas purification catalytic media that adapts to catalytic reaction temperature range.In this occasion, the HC, the CO that take place in reduction burning, NOx etc. are purified fully.
In addition, have on the sidewall in the cartridge type housing that can open and close lid and link to each other by heat storage can be contained in along the direction that flows perpendicular to burning gases or combustion air with coming in and going out, and be arranged to it freely to be taken out or puts into by the switching of described lid with burner.In this occasion gas extraction system is decomposed, can carry out the replacing of heat storage and only case lid is opened just.
In addition, reverberatory melting keeping furnace of the present invention is provided with the dust-collector that the burning and gas-exhausting by heat storage is imported.In this occasion,, also it can be separated, collects even can in burning and gas-exhausting, contain dust.
Below, effect of the present invention is described further.
The reverberatory melting keeping furnace according to the present invention, have in the burner watt tube of the diameter burner watt tube wide diameter portion bigger owing to use on the combustion air jet, to be provided with than this combustion air jet, from then on the burner of the fuel nozzle of burner watt tube wide diameter portion burner oil is set, flame holding when making low temperature improves, even make fuel injection direction near perpendicular to the combustion air flow path direction, also can suppress the generating capacity of NOx.Making on the one hand in burner watt tube rapidly exactly, the part of the combustion air of the fuel of diffusion and high temperature forms retention flame zone, make flame stabilization, on the other hand, make combustion-air flow introduced strongly in the burner watt tube with stove in the part of exhaust and fuel mix, cause exhaust gas recirculatioon burning in the stove, and then, because the unburnt gas that makes the oxygen of the outer remnants of burner watt tube and produce because of exhaust gas recirculatioon burning in the stove causes smoulder, thereby can realize the smooth combustion under the low NOx condition.Therefore, the present invention is particularly useful for little stove, or the narrow and small at interval stove of the wall relative with the wall that burner is set.
In addition, according to the present invention, owing to making on the one hand near a part along the moving combustion air of the surface current of the step portion of the ejection end face of combustion air and the fuel ejection end face stable relative combustion that forms ladder with the reverse vortex of air stream the part of fuel gas is involved in and form the flame that becomes kindling material near fuel ejection end face, on the other hand, produce negative pressure and cause powerful exhaust gas recirculatioon in step portion, make before combustion air and fuel gas mix, reduce because of exhaust being involved in the concentration that makes oxygen, and then, spray the downstream of end face at fuel, follow that fuel is burned to be attracted to mix with air, thereby one side stably causes smoulder, and one side forms the flame and the combustion-gas flow of high directivity.Therefore, using high-temp combustion air occasion, and much less the stability of flame is high, because when can suppress NOx and take place, the flame and the combustion-gas flow of formation high directivity can burn with uniform hot-fluid in vast space.And, even as when lighting stove etc. the low occasion of combustion air temperature under the situation, low and make burning and gas-exhausting be involved in scale because of the combustion air temperature is low existing and original the same because of the combustion air flow velocity, thereby make the NOx of generation few, otherwise, because of oxygen concentration improves, can not blow out the stable kindling material between fuel jet and combustion air jet flow, make the flame stabilization of formation.Therefore, the present invention also is specially adapted to the bigger occasion of stove, or the wide at interval stove of the wall relative with the wall that burner is set.
More than these, to be that the temperature-rise period of heating furnace etc. reaches low NOxization also effective for being formed on the iron that for example carries out operation more than 1000 ℃ than higher temperatures, yet, be difficult especially, promptly in the low NOxization of the nonferrous metal reverberatory melting keeping furnace that carries out operation than lower temperature etc. with make aspect the flame stabilization very effective for constituting in the past.
In addition,, can obtain uniform hot-fluid, implement equably to fuse heating object or keep its liquation state or carry out these both operations simultaneously evenly heating in the stove owing to, form the revocable flame in position according to the present invention.
In addition,, the sensible heat of burning gases can be effective to the heating of heating object, heat-economy is improved owing to, can prevent to produce the burning gases of short distance according to the present invention.
In addition, because according to the present invention, can be when carrying out the burner combustion conversion, temporarily open the bypass air door, the capacity of exhaust in the stove is increased, the cycle of following the burner conversion to cause, frequent furnace pressure change are suppressed, make the unstable of the body of heater that causes because of the furnace pressure change or door or rock to be prevented, do not make the fresh air inflow or do not make hot blast outflow in the stove, the thermal efficiency is improved.
In addition, owing to can in reducing atmosphere, heat, metal loss is reduced according to the present invention.
In addition, though since according to the present invention in stove a side and stream switching mechanism one side the big temperature difference takes place also needn't worry to take place crackle etc., thereby the conversion that can flow at short notice improves the thermal efficiency.
In addition, because can be according to being divided into requirement or the hear resistance part heat storage that uses suitable heat-storing material or accumulation of heat structure to form respectively not, thereby can making the low cost of heat storage and can make that equipment is long-term to be used continuously according to the present invention.
In addition, because according to the present invention, make to have the exhaust gas purification catalytic media on the heat storage and can collect CO and the HC that contains in the burning and gas-exhausting, even the smooth combustion occasion that makes when preferentially carrying out etc. as the reduction burning, and when not using the low-NOx combustor of complicated structure, NOx is lowered.
In addition, owing to can carry out the replacing of heat storage simply according to the present invention, even when heat storage produces fault, also can at short notice stove be refired.
In addition, because according to the present invention, even sneak into dust such as aluminium humite or flux in the exhaust in the stove, also can be with its separation and collection, so the working life of heat storage is prolonged.And, owing to before importing gatherer, make temperature decline and do not need dilution air, and because of exhaust volume reduces, enough with the tubule road, and also need not anti-burn etc., more help the dust arrester miniaturization.
Description of drawings.
Fig. 1 is the top plan view of schematic representation reverberatory melting keeping furnace structure of the present invention,
Fig. 2 is the profilograph that described fusion keeps stove,
Fig. 3 is the figure of schematic representation as the buner system structure embodiment of accumulation of heat alternate combustion,
Fig. 4 is schematic representation low-NOx combustor structure and schematic diagram that combustion position is described, and wherein (A) is profilograph, (B) is upward view,
Fig. 5 is the curve map of the measurement result that concerns between expression combustion air flow velocity of low-NOx combustor shown in Figure 10 and NOx,
Fig. 6 is low-NOx combustor structure among other embodiment of schematic representation and the schematic diagram that combustion position is described,
Fig. 7 (A) is the stereogram of expression as ceramic honeycomb heat storage one example, (B) for the expression ceramic heat storage body profile of example is installed,
Fig. 8 is the key diagram of expression regenerator temperature distribution, (A) decomposing state of expression heat storage, and (B) expression regenerator temperature distribution,
Fig. 9 is cut apart routine key diagram for the expression heat storage, (A) expression same configuration heat storage occasion, and (B) expression makes the occasion of not isostructure heat storage combination,
Figure 10 is the figure that simple expression furnace pressure control system is formed,
Figure 11 is the key diagram of expression because of the repressed furnace pressure variation of furnace pressure control system shown in Figure 10,
Figure 12 is the key diagram that the fusion of schematic representation traditional reflective type keeps stove,
Figure 13 is the schematic diagram of traditional two-stage combustion type low-NOx combustor.
The specific embodiment
Below, with reference to the accompanying drawings shown in an embodiment structure of the present invention is elaborated.
Fig. 1 represents the present invention is used for the embodiment of well formula reverberatory melting keeping furnace.This well formula reverberatory melting keeping furnace 30 is for generally having and be positioned at the heating clamber that fixed square calciner sidepiece is called as forehearth 31 and link to each other, and is exposed to the stove of the melting groove in the atmosphere.The purpose that forehearth 31 is set is mainly the fusion of carrying out secondary aluminium, and material is put into, and keeps heat to make with liquation and fuses.With upper and lower to pushing off the slag door 33 melting groove 32 and forehearth 31 separated, as required, with liquation pump (not shown) thus wait circulation promotion betwixt fused.
In melting groove 32 1 sides the liquid level almost parallel of heat-accumulation combustion type buner system 20 according to flame combustion gas that makes formation and aluminum melt 34 is arranged on the furnace wall 35 like that.In addition, the heat-accumulation combustion type buner system 20 of 1 system is set in the present embodiment, yet, also can install the system more than 2.
According to the liquid level almost parallel of the combustion air that makes ejection and fuel and aluminum melt 34, heat-accumulation combustion type buner system 20 is configured on the wall 35 of melting groove 32 along liquid level formation flame and gas-flow.In the present embodiment occasion, two burners 21,22 that making hockets burns constitute the heat-accumulation combustion type buner system 20 of 1 system as one group.This heat-accumulation combustion type buner system 20 in an embodiment as shown in Figure 3, heat storage 23 is arranged in the burner shell 27, make form respectively integrated, two of comprising burner 21,22 and heat storage 23,23 respectively are combined, be set to make on the one hand carry out alternate combustion, on the other hand by do not burn stop in burner and accumulation of heat physical efficiency burning and gas-exhausting is discharged.Be arranged in two burners 21,22, by stream switching mechanism 26 gas extraction system 25 of discharging burning gases is linked to each other with the gas system 24 that gives that supplies with combustion air, reach on the one hand by heat storage 23 and supply with combustion air, reach on the other hand by heat storage 23 and discharge burning gases from the opposing party's burner 22 (or 21) to a side burner 21 (or 22).For example be pressed into the supply combustion air, for example in stove, burning gases extracted out, after necessary processing such as collection dust, in atmosphere, discharge with the exhaust gear of scavenger fan 29 grades with fan 28 grades.By not shown selections such as for example triple valve, alternately fuel feed system is linked to each other with either party's burner 21,22, supply with fuel.In addition, 36 among the figure is dust accumulators such as cyclone dust collectors.
As each burner 21,22, for example be suitable for using low-NOx combustor shown in Figure 4 herein.This low-NOx combustor for to make the burner that sprays with the combustion-air flow that is preheated to high temperature with fuel gas with paralleling, and constitute in the following manner, promptly be included in air nozzle 1 that runs through the combustion air ejection that forms fuel (gas) nozzle 2 and will be preheated to high temperature with high speed on the refractory material block 3 and the jet 6,7 that on two end faces 4,5 with ladder of refractory material block 3, forms each nozzle far above fuel flow rate.In addition, around fuel nozzle 2, bury underground and constitute the pipe arrangement 8 that primary air is supplied with stream, about 10% the primary air that is about auxiliary air being flow through around fuel nozzle 2.And then, on the head portion of fuel nozzle 2, form other primary air stream on every side towards main jet loophole 7, the jet 9 that the part of fuel is sprayed, the part of this fuel is sprayed as guiding fuel, perisporium to pipe arrangement 8 is impacted, and in the primary air stream, expand, thereby constitute the pilot burner that obtains good admixture.And, also not shown igniter is set at this place in order in burning, to form a stable flame 12.Piping system is only by the main pipe arrangement that most of combustion air of using as auxiliary air is flow through, air nozzle 1 and make fuel and fuel distribution tube (primary air pipe arrangement 8 and fuel nozzle 2) that primary air flows through constitutes, thereby very compact.In addition, in the present embodiment, the pipe arrangement 8 that primary air is flow through is set around fuel nozzle 2, near jet, form pilot burner, yet, be not limited thereto, also can be according to circumstances, only near the jet of indivedual fuel nozzles of fuel nozzle, pilot burner is set.
In addition, form and to make fuel injection orifice 7 and air jet 6 not at grade, it is arranged on the different face with ladder, and fuel injection orifice 7 is configured in than air jet 6 side in downstream more.Exactly fuel ejiction opening 7 is arranged on from refractory material block end face (to call datum level in the following text) 4 end faces that stretch out (to call the flame stabilization face in the following text) 5 that air jet 6 is set.Make stable flame 12 and fuel F fuel ejiction opening 7 ejections of flame stabilization face 5 thus.Combustion air is sprayed with high speed from the central authorities of refractory material block 3.At this moment, can near the step portion of flame stabilization face 5, form the reverse vortex 11 of relative combustion, form the flame stabilization zone of sharply mixing with the part of fuel gas with air stream.Therefore, can form much less when high temperature, even when low temperature, also be difficult for stable flare blowing-out.In the present embodiment occasion, it is the single integrated member of refractory material block 3 formations with air nozzle 1 and fuel nozzle 2 configured in parallel and maintenance, yet, also can distinctly form part that keeps air nozzle 1 and the part that keeps fuel nozzle 2 according to occasion, use then combines it.In addition, the present embodiment occasion be used in without pipe arrangement perforate on the refractory material block 3 and in establish refractory material block 3 burner shell constitute air nozzle 1.Much less, also can constitute air nozzle 1 with pipe arrangement.
In addition,, consider, on refractory material block 3, be necessary to make air nozzle 1 and fuel nozzle 2 spaced apart certain distances from intensity adopting the said structure occasion.Therefore, exist in the zone that firm generation is sprayed, fuel is difficult to the tendency of being induced by high-speed air flow.Therefore, as shown in the figure, preferably the shape of the part 13 of the close air nozzle 1 of fuel injection orifice 7 is formed curve form towards a lateral bending song of air nozzle 1.In view of the above, fuel is gone out to combustion-air flow one effluent.Therefore, and then the mixing ability of following of fuel is improved, prevent that the free composition that do not fire such as CO, HC from taking place.In addition, because the fuel supply to the eddy current 11 that produces the combustion air adverse current is improved, thus can form more stable kindling material.Also be not limited to curved surface about above-mentioned shape, so long as it is just passable to satisfy the structure of such function, even for example also can in the inclined-plane.
In addition, air nozzle 1 is arranged on the step portion of flame stabilization face 5 and datum level 4 boundaries.And have the function that fuel is followed mixing near making on the part of flame stabilization face 5, making function with exhaust gas recirculatioon near on the part of datum level 4.Be exactly shown in Fig. 4 (B), the face 10 of flame stabilization face 5 with the step portion of datum level 4 is being configured to can obtain to have simultaneously the function of following the mixing and recycling two aspects with jet 6 perpendicular the splitting to two halves carry out the central authorities of jet 6 to cutting the occasion of configuration like that of this face 10 with air nozzle 1.On the other hand, be configured to the occasion (not shown) external at face 10 with the jet 6 of air nozzle 1 with step portion, compare with occasion shown in Fig. 4 (B),, the function that oxygen element concentration reduces in the combustion air is improved thereby become owing to make the enlarged areas that is involved in exhaust.In addition, face 10 cross-over configuration that make step portion, the occasion that jet 6 is wrapped into substantially, because the air that has sprayed increases until flame stabilization face 5 affined parts at refractory material block 3, make the combustion-air flow of high directivity and then from flame stabilization face 5 ejection, thereby make the mixing ability of following of burning gases become better.
When low-NOx combustor according to formation like this shown in Figure 4, spray occasion at combustion air with high temperature and high speed, to in early days, powerfully guide with fuel and make it to follow from flame stabilization face 5 combustion airs ejection, that have universal property with high speed, and when being involved in mixing gradually, extend at a distance than the low velocity parallel injection.But, because the combustion air flow velocity is far above fuel flow rate, for example for reaching high speed very high more than the 100m/s, and because the fuel of following is brought into gradually, just exhaust is being involved in a large number in the time of till arriving flame stabilization face 5, thereby sharply do not cause combustion reaction, and combustion reaction is slowly carried out.And then, because the air velocity height owing to carry out combustion reaction when being involved in exhaust in a large number in combustion reaction, more promotes smoulder again.More than can see clearlyer from the experimental result that concerns between combustion air flow velocity shown in Figure 5 and the NOx generating capacity, the jet velocity of combustion air is higher, the amount of NOx reduces, and its effect, promptly quantity combusted bigger (becoming the degree of high temperature) is more remarkable.Therefore, when burner, can form relatively even and longer hot-fluid and can realize low NOxization according to present embodiment.And, because a part of fuel is induced in the adverse current of the combustion air that causes in the zone near the step portion of flame stabilization face 5 and diffusion mixes, and become the stable flame of kindling material, when not mentionleting alone high temperature, even can form stable flame during low temperature yet.Therefore, present embodiment is applicable to the long stove of distance between the wall relative with the wall 35 that burner 21,22 is set, for example big shape stove etc.
In addition, as burner, preferably use low-NOx combustor shown in Figure 6.This burner is for being preheated to the combustion-air flow of high temperature relatively, make the burner that on every side spray of fuel from this air stream, be the burner watt tube 42 that configuration has the burner watt tube wide diameter portion 41 of larger diameter on combustion air jet 40, the fuel nozzle 43 from burner watt tube wide diameter portion 41 burner oils is set.In this occasion, as long as can make the inboard of fuel from the burner watt tube 42 of burner watt tube wide diameter portion 41, promptly spray to subsidiary combustion chamber 46, this injection direction is not limited especially, yet, preferably spray, be more preferably relative combustion, make to clash with air stream angular injection fuel in the face of combustion-air flow.In the occasion of relative combustion with air stream angular injection fuel, compare with the vertical occasion of spraying, can promote exhaust gas recirculatioon burning and the outer smoulder of burner watt tube in the stove, further reduce the generating capacity of NOx.In addition, in upstream one side of burner watt tube wide diameter portion 41 pilot burner 44 is set, with the injection of channeling conduct fuel.In this occasion, form the flame stabilization zone in the upstream of burner watt tube wide diameter portion 41 side, to become kindling material, even combustion air temperature step-down also can make flame stabilization.Supplying with combustion air ground occasion with about high temperature more than 1000 ℃, often burn near burner watt tube wide diameter portion 41 owing to unnecessary, also this pilot burner 44 can be arranged on more upstream one side.In addition, in the present embodiment occasion, the 1st fuel nozzle 45 that sprays primary fuel is set in burner throat 40.After being started working, stove stops using this 1st fuel nozzle 45, and lower in furnace temperature, when being difficult to make flameholding, exactly when stove is started working etc. under the situation, relative combustion becomes to spray primary fuel with air stream with intersecting vertically, makes rapid mixing, diffusion and reach smooth combustion.At this moment,, make the NOx of generation also few because furnace temperature is low, and in permissible range.And, when furnace temperature reaches set point of temperature, because of only making from the 2nd fuel nozzle 43 burner oils of burner watt tube wide diameter portion, the smoulder that produces above-mentioned exhaust gas recirculatioon burning and cause this unburnt gas and remaining oxygen, and make the generating capacity minimizing of NOx.In addition, present embodiment is indivedual examples of representing to be provided with respectively the 1st fuel nozzle 45 and pilot burner 44.Yet the present invention is not limited, also the 1st fuel nozzle 45 can be set especially, and only establish pilot burner 44, in addition, makes this pilot burner 44 be arranged in more upstream one side of Fig. 1 respective members, or makes near the 2nd fuel nozzle 43.In addition, as the 2nd fuel nozzle 43 also can adopt burner shown in Figure 4, with the fuel nozzle 2,8 of pilot burner dual-purpose, and fuel nozzle and pilot burner beyond the fuel nozzle of this 2nd pilot burner dual-purpose are not set.In addition, is certain occasion making burner watt tube wide diameter portion 41 apart from the degree of depth of stove internal face, also fuel nozzle 43 can be arranged on any part, yet in the described degree of depth is not a timing, for example do not give illustrated, burner is arranged to curved surface or makes occasions such as inclination is provided with, wish it is arranged on the bosom.The occasion that adopts pilot burner dual-purpose nozzles at the nozzle 43 of acting as a fuel too, at this moment, be arranged on shallow place and easily cause exhaust gas recirculatioon in the stove in burner watt tube wide diameter portion 41, yet, in the depths, because of exhaust in the stove is difficult to enter, the concentration of oxygen does not reduce, and make Ignition Stability good, therefore, if the arrangement of fuel nozzles of fuel nozzle 43 or pilot burner dual-purpose is left the darker place of the degree of depth of stove internal face at burner watt tube wide diameter portion 41, because of the concentration that does not make oxygen reduces, and make Ignition Stability good.
When according to the low-NOx combustor that constitutes like this, as shown in Figure 6, make along the part of the fuel of angular injection and mix diffusion mutually, and form the regional X1 of flame stabilization with the part of the combustion air that has been preheated to high temperature by heat storage, form stable flame.In addition, in the subsidiary combustion chamber 46 of burner watt tube wide diameter portion 41, the interior exhaust of stove is attracted with air strongly from the high-temp combustion of air trunnion with ejection at a high speed, and with mix mutually from the part of the fuel of the bight angular injection of burner watt tube wide diameter portion 41 and cause the exhaust gas recirculatioon burning, form recycle burning zone X2 because of the burning and gas-exhausting of lack of air.In addition, in the outside of burner watt tube 42, form that making reacts between the unburnt gas that takes place in oxygen in the burning gases and the exhaust gas recirculatioon combustion zone X2 in burner watt tube wide diameter portion 41 from remaining in of flame stabilization zone X1 causes the regional X3 of smoulder.In addition, in this occasion, because by at burner watt tube 42 inner direct fuel, unnecessary laterally gas diffusion is suppressed to make the flame axis that warms oneself in front of a fire, thereby the unreacted fuel gas scale of construction can be with burning the time suppresses to bottom line.Therefore, even be operated in the stove of 700-800 ℃ of left and right sides moderate temperature scope as well formula reverberatory melting protection stove, can make flame stabilization, NOx does not increase yet.The most suitable in this burner occasion for the narrow at interval stove of the wall relative with the wall 35 that burner is set.
In addition, in this burner occasion, temperature reaches till the set point of temperature in stove, and the whole fuel that spray from the 1st fuel nozzle 45 are burnt, and stove is warmed.At this moment,, the fuel that sprays from the 1st fuel nozzle 45 is mixed immediately with combustion air even the combustion air temperature is lower, and with making flameholding near the pilot flame that is provided with.And, when reaching set point of temperature, make fuel injection ceases by the 1st fuel nozzle, the fuel that carries out the 2nd fuel nozzle 43 is sprayed.Here, so-called set point of temperature is the processing temperature of stove not necessarily, and is meant temperature or its above temperature that only can keep flame with the burner oil of the 2nd fuel nozzle 43.In addition, in the occasion that adopts pilot burner dual-purpose nozzle as the 2nd fuel nozzle 43,, light stove by from beginning to make this 2nd fuel nozzle burning.In addition, burning for example is at 10 seconds-2 minutes at interval with the conversion of exhaust, wishes to be preferably in the utmost point short time interval of 10-40 about second and to carry out in about 1 minute.Carry out heat exchange in this occasion with the high temperature high efficiency.In addition, also can make the burning gases of discharging reach set point of temperature, for example change during 200 ℃ of left and right sides through heat storage 23.
As mentioned above, make at least one pair of burner occasion of burning that hockets like this, owing to make flame location frequently move, change, can make the hot transfer mode homogenising more the combustion chamber in, making the heating of appearance irregular, be incubated irregular phenomenon and tail off.
Here, for example utilize heat storage, alternately on this heat storage, flow through, directly carry out heat exchange by making burning and gas-exhausting and combustion air, the combustion air of being supplied with by Fig. 4 or burner shown in Figure 6 is preheated to roughly near the burning and gas-exhausting temperature, for example 700-800 ℃ or its above high temperature.
As heat storage 23, preferably use as shown in Figure 7, have certain actual internal area, and connected the ceramic honeycomb that flows through, for example other material of cordierite, mullite or heat-resisting acid-proof etc. along straight line.The thermal capacity of this ceramic honeycomb is big, durability is higher and the pressure loss is lower.And, can replace and ceaselessly carry out exhaust and give gas.Therefore, make dust in the exhaust etc. be difficult to adhere to even produce in the cellular stream attached to heat storage 23,, do not make contaminated because of by oppositely cleaning.In addition,,, caught shortly by ceramic surface, therefore can not make the pipeline etc. of downstream exhaust gas system 25 produce cold end corrosion because of the part of the ion in the exhaust and chemical change material thereof even delivery temperature is reduced to below the acid dew-point temperature carrying out from exhaust reclaiming when hot.In addition, will the heat storage 23 shown in Fig. 7 (b) make it can be along being housed in the casing 38 of the part of sidewall as lid 39 with coming in and going out, and be assembled between burner 21,22 and the stream switching mechanism 26 with the perpendicular direction of stream.Therefore, the heat storage that only just can easily take out breakage and even obstruction by uncap 39 is changed.
In addition, being imported into dust accumulator 36 after making the fusion powder that produces in when fusion that is included in the exhaust and dust etc. become low temperature by heat storage 23 collects.Therefore, the trouble that generation dust such as the stream switching mechanism 26 that is in dust accumulator 36 downstreams and scavenger fan 29 are adhered to.In addition, to the mode of dust accumulator 36, structure waits and not to limit especially, so long as just passable by merely changing the structure that flow direction can make dust fall.
In addition, shown in Fig. 9 (A), preferably the flow direction with heat storage 23 longshore current bodies is divided into multi-layer configuration.This be because, when make the burning that hockets of a pair of burner 21,22 at short notice in order to improve heat storage efficiency, promptly shown in Fig. 8 (B), make the temperature of close stove one side of heat storage 23 become high temperature, and the position of close stream switching mechanism 26 1 sides of its opposite side become low temperature.When such heat storage 23 is formed one, make the difference variation fierceness owing to carrying out the stream conversion continually, in addition,, the possibility that cracks because of the thermal expansion difference is increased because difference variation is big.Therefore,, every thermal expansion difference is diminished, thereby can prevent the crackle that causes because of thermal expansion difference by heat storage 23 is divided into multilayer.As an example, shown in Fig. 9 (A), be that heat storage 23 is divided into 3 layers.At this moment, be preferably in each heat storage 23,23,23 chien shih and sandwich buffer component 37.
In addition,, the corrosion of heat storage 23 is carried out significantly near the high temperature position of stove one side, and slower in corrosion near the low temperature position of stream switching mechanism 26 1 sides.Therefore, if whole heat storage 23 is made by the corrosion resistance material of costliness, cause unnecessary cost up.Therefore, only use the heat storage 23 of corrosion resistance material making, and use cheap heat-storing material just passable at other position at the high temperature position of stove one side.In addition, the method that prolongs as the working life that makes heat storage 23, also should be as far as possible with the honeycomb ceramics wall thickness t thickening of high temperature position.In this occasion, consider thermal shock resistance is descended, should adopt the high material of pyroconductivity can avoid this problem.In addition, be applicable to that furnace temperature is the high temperature furnace occasion about 1500 ℃, can be only using high heat-resisting heat-storing material, and use cheap material in other parts in part near the 1st, the 2nd heat storage 23,23 of a side in the stove.
In addition, when using honeycomb type heat storage 23 under the environment of supervening the such dust of fusion powder, exist to cause possibility of jamming.Therefore, as countermeasure, shown in Fig. 9 (B), the filtering bodies of the 1st heat storage 23 as an alternative can be imbedded the sphere or the nugget shape heat storage of high-fire resistance, in order to change at ordinary times, even and use the honeycomb type heat storage also can on the 2nd, the 3rd layer.
In the present embodiment, be that heat storage 23 is arranged on burner throat rear, yet, in order to reduce sensible heat loss and the space that can utilize the furnace walls thickness portion in the stove as far as possible, also heat storage can be arranged on stove one side.In this occasion, in general since burner that the space is set is not abundant, the possibility that existence can not all be inserted the heat storage with necessary capacity.In this occasion, when heat storage is cut apart, its part is arranged in the burner watt tube portion, when being arranged on its another part near stream switching mechanism 26, the high-temperature exhaust air loss being reduced, and reach the densification of stove.In addition, as mentioned above,, will it not be contained in the same regenerator in the occasion that multi-functional, multiple structure heat storage is used in combination yet.Cut apart adaptive functions are set, the regenerator of structure, by exhaust and air flow circuit being connected in series with heat-insulated pipe, the free degree in guaranteeing to design and construct.
In addition, the combustion air that is preheated to high temperature in use reduces the occasion of burning, even use as Fig. 4 or burner shown in Figure 6, compares worry still with tradition and can have to a certain degree NOx at least.Therefore, preferably make the heat storage 23 that has exhaust gas purification catalytic media function on its part.For example, the occasion purifying with the catalytic media that impels the CO oxidation can make about 150-700 ℃ of scope, and the CO that contains till about 5% reaches 100% purification.In addition, the occasion carry out alternate combustion with chien shih in short-term makes the temperature of heat storage 23 become high temperature (for example about 1000 ℃) in stove one side, and becomes low temperature (for example about 200 ℃) in a side of stream switching mechanism 26.Therefore, as shown in Figure 8 by the flow direction with heat storage 23 longshore current bodies be divided into multilayer by make on this block with catalytic media adapt to the Temperature Distribution scope of each catalytic media reaction, 100% CO can be purified.In addition, when carrying out the CO purification, in heat storage 23, cause exothermic reaction, yet, owing to after conversion, this heat can be used for the preheating of combustion air, thereby not produce heat loss.And then, if the purification of CO, HC becomes possibility, burning is carried out under the reducing atmosphere condition, can prevent heating object, aluminum melt generation oxidation.In addition, for NOx too, as long as make with catalytic media consistent just passable with necessary temperature range.For example, when only CO or HC being purified, can mainly use platinum as catalytic media.The range of reaction temperature of this platinum catalytic media is about 150 ℃-700 ℃, when being higher than this temperature, can not use because of sintering takes place, if below the temperature range, will not play catalytic reaction at this.In addition, when at the same time CO and NOx being purified, can use the catalytic media of additional a part of rhodium on platinum.The ratio of platinum and rhodium is preferably platinum: rhodium=5: 1-20: 1, and the temperature range of its adaptation is more satisfactory with 300 ℃-500 ℃.Therefore, burning and gas-exhausting is passed through therebetween, be heated to band platinum catalytic media on 150 ℃-700 ℃ the part, or make, can from exhaust, remove CO or HC and NOx being heated to band platinum rhodium catalytic media on 300 ℃-500 ℃ the part by making heat storage.
The present embodiment reverberatory melting keeping furnace of Gou Chenging as mentioned above, available following furnace pressure control system is controlled furnace pressure, can make the unstable of body of heater and door etc. or rock to be inhibited.
This fusion keeps the control of the furnace pressure of stove 30, and for example available furnace pressure control system shown in Figure 10 is carried out.This control system is by following part, promptly detect the pressure electric converter 51 of furnace pressure, detect the sensor 53 of burning conversion, output burning switching signal, according to signal from pressure electric converter 51, to the switching of gas extraction system 25, be the air door 54 that flow is controlled, the bypass 55 of this air door 54 is arranged in the bypass 55, to the switching of bypass 55, promptly the bypass air door 56 controlled of flow is formed according to the burning switching signal.Pressure electric converter 51 is from pressure sensor 52 input furnace pressure information.This control system takes place than cataclysm and is higher than setting value when above at furnace pressure, switching with the air door 54 of main exhaust system 25 adapts with it, yet, follow the burning conversion of burner 21,22, when frequently causing the less change of furnace pressure, switching and its adaptation with bypass 55, by in the burning conversion of carrying out burner 21,22, temporarily open bypass air door 56, the capacity of exhaust is increased suppress the cycle of following burner 21,22 conversions to cause, frequent furnace pressure change.Shown in the dotted line among Figure 11, the furnace pressure change is suppressed with this control.
In addition, with the foregoing description as one embodiment of the invention, yet, not limited, conceive scope all distortion can be arranged not leaving the present invention.For example, in the present embodiment, mainly to high-temp combustion is linked to each other with burner with air, and even the situation of the alternate combustion by establishing heat storage in utilizing describes, yet be not limited to this especially, for example, also can turn round with air supply system and gas extraction system by making the heat storage relative combustion, or utilize stream switching mechanism to make the fluid flow direction of relative heat storage produce conversion, utilize the heat extraction of the burning and gas-exhausting of high temperature, the combustion air that is preheated to high temperature is supplied with to single burner continuously, made and carry out continuous burning.In addition, present embodiment mainly describes the occasion of using gases fuel, yet can be not limited thereto, and for example, also can use the liquid fuel of an oily class.
Claims (11)
1. reverberatory melting keeping furnace, use heat-accumulation combustion type burner as heating source, described burner use is burnt through the combustion air that burning and gas-exhausting is preheated to high temperature, it is characterized in that, described burner has the nozzle for jetting fuel of configured in parallel and the nozzle of the described combustion air of high velocity jet of 100m/s at least, center on these nozzles with refractory material, simultaneously ladder is set forming fuel nozzle jet end face and form between air nozzle jet end face, and the end face that makes fuel nozzle one side stretches out more forward than the end face of air nozzle one side.
2. maintenance stove according to claim 1 is characterized in that, disposes a pair of burner at least as heating source, makes the burning that hockets of this a pair of burner, to form the unfixed flame in position to evenly heating in the stove.
3. maintenance stove according to claim 2 is characterized in that, in the adjacent position, the high speed ejection combustion air with 100m/s at least becomes short distance to prevent flame and burning gases with described a pair of burner configuration.
4. maintenance stove according to claim 2 is characterized in that, described maintenance stove and accessory has: the pressure electric converter that detects furnace pressure; To burning conversion detect, with the sensor of output burning switching signal; According to from the signal of pressure electric converter and to the switching of gas extraction system, be the main air door that extraction flow is controlled; The bypass of described air door; Be arranged in this bypass, according to the burning switching signal and to the switching of this bypass, be the bypass air door that extraction flow is controlled, corresponding with the switching of bypass with the less furnace pressure change of following frequent burning conversion to cause, surpass the bigger change that sets value with the switching and the furnace pressure change of main exhaust system and absorb furnace pressure accordingly and change.
5. maintenance stove according to claim 1 is characterized in that, forms reducing atmosphere with the following high-temperature preheated air of theoretical air requirement heating object is heated.
6. maintenance stove according to claim 1 is characterized in that, carries out the preheating of combustion air with the heat storage that allows combustion air and burning and gas-exhausting alternately pass through, and the flow direction of this heat storage longshore current body is divided into a plurality of parts at least.
7. maintenance stove according to claim 6 is characterized in that, the part of a side in the close stove of the described heat storage that is divided into a plurality of parts and near the part of flow path converter one side respectively with different material formations.
8. maintenance stove according to claim 6 is characterized in that, the part of a side in the close stove of the described heat storage that is divided into a plurality of parts and near the part of flow path converter one side respectively with different structure formations.
9. maintenance stove according to claim 6 is characterized in that, makes on the described heat storage that is divided into a plurality of parts to have the exhaust gas purification catalytic media corresponding with catalytic reaction temperature range.
10. maintenance stove according to claim 6, it is characterized in that, described heat storage is contained in the cartridge type housing that has lid to be opened/closed on sidewall and links to each other with burner, can come in and go out along flow direction, and freely come in and go out by the switching of described lid perpendicular to burning gases or combustion air.
11. maintenance stove according to claim 6 is characterized in that, the dust collection of introducing by the burning and gas-exhausting of heat storage is set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96102933A CN1130539C (en) | 1996-03-22 | 1996-03-22 | Reverberatory melting keeping furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96102933A CN1130539C (en) | 1996-03-22 | 1996-03-22 | Reverberatory melting keeping furnace |
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| CN1171536A CN1171536A (en) | 1998-01-28 |
| CN1130539C true CN1130539C (en) | 2003-12-10 |
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| CN96102933A Expired - Fee Related CN1130539C (en) | 1996-03-22 | 1996-03-22 | Reverberatory melting keeping furnace |
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| US9657945B2 (en) * | 2015-05-26 | 2017-05-23 | Air Products And Chemicals, Inc. | Selective oxy-fuel boost burner system and method for a regenerative furnace |
| JP7029277B2 (en) * | 2017-11-06 | 2022-03-03 | 日本碍子株式会社 | Manufacturing method for regenerative burners, industrial furnaces and fired products |
| CN111426194A (en) * | 2019-01-10 | 2020-07-17 | 吉达克精密金属科技（常熟）有限公司 | Continuous furnace empty burning prevention system and method |
| CN117206458A (en) * | 2023-11-08 | 2023-12-12 | 江苏锋拓精锻科技有限公司 | Alloy material forging furnace |
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| JPS6078207A (en) * | 1983-10-03 | 1985-05-02 | Babcock Hitachi Kk | Low nox type burner |
| US4602673A (en) * | 1983-10-03 | 1986-07-29 | L. & C. Steinmuller Gmbh | Apparatus for preheating combustion air, accompanied by simultaneous reduction of NOx contained in the flue gases |
| JPS60133205A (en) * | 1983-12-20 | 1985-07-16 | Babcock Hitachi Kk | Low nox burning method |
| JPS60162108A (en) * | 1984-01-31 | 1985-08-23 | Babcock Hitachi Kk | Low nox high efficiency combustion chamber |
| US4907962A (en) * | 1986-05-26 | 1990-03-13 | Hitachi, Ltd. | Low NOx burner |
| CN2068645U (en) * | 1990-02-20 | 1991-01-02 | 常熟市喷嘴厂 | Heat accumulation self-preheating burner |
| US5403181A (en) * | 1992-06-05 | 1995-04-04 | Nippon Furnace Kogyo Kaisha, Ltd | Method of low-NOx combustion and burner device for effecting same |
| JPH0777396A (en) * | 1993-06-21 | 1995-03-20 | Tokai Rubber Ind Ltd | Heat accumulator |
| CN2199437Y (en) * | 1994-07-15 | 1995-05-31 | 机械工业部第五设计研究院 | Heat accumulation type high-temp. reheating burner |
| WO1996002793A1 (en) * | 1994-07-18 | 1996-02-01 | Toyota Jidosha Kabushiki Kaisha | LOW NOx BURNER |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1171536A (en) | 1998-01-28 |
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