CN103604292B - Three-phase alternating current mineral hot furnace furnace control method and three-phase alternating current mineral hot furnace - Google Patents
Three-phase alternating current mineral hot furnace furnace control method and three-phase alternating current mineral hot furnace Download PDFInfo
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- CN103604292B CN103604292B CN201310584876.0A CN201310584876A CN103604292B CN 103604292 B CN103604292 B CN 103604292B CN 201310584876 A CN201310584876 A CN 201310584876A CN 103604292 B CN103604292 B CN 103604292B
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Abstract
The invention discloses a kind of three-phase alternating current mineral hot furnace furnace control method, there is in the burner hearth of described three-phase alternating current mineral hot furnace the electrode vertically arranged, furnace charge floor in burner hearth is longitudinally divided into several along it and smelts district, insulated from each other between each smelting district, the corresponding electrode in each smelting district.Also disclose a kind of three-phase alternating current mineral hot furnace, comprise the electrode in the burner hearth being vertically arranged in described three-phase alternating current mineral hot furnace, also comprise the high-temperature insulation device be arranged in burner hearth, burner hearth corresponding to furnace charge floor is longitudinally divided into several along it and smelts district by this high-temperature insulation device, thus make between each smelting district insulated from each other, the corresponding electrode in each smelting district.The method and this three-phase alternating current mineral hot furnace all can solve the impact that furnace charge layer branch current runs three-phase alternating current mineral hot furnace, improve working of a furnace stability, improve the secondary voltage that three-phase alternating current mineral hot furnace is run and the lower end reaction zone electric energy significantly increasing electrode, to reduce product specific energy consumption and to improve output simultaneously.
Description
Technical field
The present invention relates to mineral hot furnace furnace control method and mineral hot furnace, specifically relate to a kind of three-phase alternating current mineral hot furnace furnace control method and a kind of three-phase alternating current mineral hot furnace.
Background technology
Three-phase alternating current mineral hot furnace, belong to the one of mineral hot furnace, the product smelted comprises ferroalloy and calcium carbide, the yellow phosphorus etc. such as silicon system, chromium system, manganese system, during work, electrode inserts in the furnace charge in burner hearth, carries out arc-covering slag operation, inputs electric flux by electrode in stove, heat for thermal source with the electric arc occurred between electrode tip and furnace charge and charging resistance heat, therefore also claim resistor electric arc stove.After load melting, be divided into three layers in electric furnace, uppermost one deck is the furnace charge layer added, and the second layer is the conversion zone that the lower end material melting of electrode is formed, and third layer and orlop are the melting layers that melt (product) is formed.For three-phase alternating current mineral hot furnace, along with furnace charge, the change of method operation, furnace charge layer resistance, stove material layer temperature, stove bed permeability etc. also ensues change, furnace charge layer resistance characteristic also will change, the working of a furnace is caused repeatedly to change and cannot stablize, the working of a furnace will be caused slightly because of carelessness to worsen, electrode not under, bottom temperature is inadequate, to come out of the stove difficulty, now reflecting from instrument, is that current fluctuation is large, transformer gear lower (electric furnace secondary voltage is on the low side), furnace power factor is low, rise fall of electrodes is frequent, phenomenon in stove is then: furnace charge layer is overheated, and (crust in furnace charge face, furnace charge is flushing, and material is many, be partially formed fusion hole), material spray of collapsing is serious, furnace gas temperature is high, electrode is lifted serious, furnace temperature is low, then show as liquid form product when coming out of the stove to have some setbacks, flow velocity is slow, product is clamminess and easily blocks stove eye, disclosing at the moment round steel discloses less than burner hearth center, final result is then that product specific energy consumption is high, yield poorly, operating personnel feel very headache to this, the reason of such result is caused mainly to be: cold conditions Charging Stock Used can be poor, molten state mixture is good conductor, mixture charge resistance characteristic is that resistance reduces along with the rising of temperature, when furnace charge layer is overheated, furnace charge layer branch current is too large, thus affect the stable operation of electrode, cause the stability of the working of a furnace very poor, this feature determines the complexity and difficulties of three-phase alternating current mineral hot furnace furnace control, also be numerous forerunners being engaged in mineral hot furnace furnace control the causes for the success not yet so far.
Cause product specific energy consumption high to improve the three-phase alternating current mineral hot furnace working of a furnace unstable, the problem yielded poorly, traditional way safeguards by strengthening furnace charge face, regulate formula, reinforcement is come out of the stove, adjustment secondary operation voltage, the means such as lifting electrode realize, but these ways are all just passive when degradating trend appears in the working of a furnace or when worsening to be taked, these measures normally all will experience a levelling period from being implemented into the working of a furnace, or when the working of a furnace is judged inaccurate and adopt improper treatment measures time, the working of a furnace also can be caused to worsen further, this relies on the practical experience of method operating personnel completely, this also just causes the strange phenomenon that the working of a furnace varies with each individual, therefore, it is not very desirable that conventional approach improves effect to working of a furnace instability problem, so that it is high still to there is product specific energy consumption, the problem yielded poorly.
Summary of the invention
On the one hand, the technical problem to be solved in the present invention is: provide a kind of three-phase alternating current mineral hot furnace furnace control method, the method can solve the impact that furnace charge layer branch current runs three-phase alternating current mineral hot furnace, improve working of a furnace stability, improve the secondary voltage that three-phase alternating current mineral hot furnace is run and the lower end reaction zone electric energy significantly increasing electrode, to reduce product specific energy consumption and to improve output simultaneously.
On the other hand, the technical problem that the present invention also will solve is: provide a kind of three-phase alternating current mineral hot furnace, this three-phase alternating current mineral hot furnace can solve the impact that furnace charge layer branch current runs three-phase alternating current mineral hot furnace, improve working of a furnace stability, improve the secondary voltage that three-phase alternating current mineral hot furnace is run and the lower end reaction zone electric energy significantly increasing electrode, to reduce product specific energy consumption and to improve output simultaneously.
With regard to method of the present invention, in order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of three-phase alternating current mineral hot furnace furnace control method, there is in the burner hearth of described three-phase alternating current mineral hot furnace the electrode vertically arranged, described electrode inserts in the furnace charge in burner hearth, during smelting, furnace charge is heated by electrode current, from top to bottom form furnace charge layer, conversion zone and melting layer successively, wherein, the corresponding conversion zone of lower end of electrode, the liquid form product of melting layer flows out from plug for outlet, furnace charge floor in described burner hearth is longitudinally divided into several along it and smelts district, insulated from each other between each smelting district, the corresponding electrode in each smelting district.
Between described each smelting district, lower surface insulated from each other is positioned at more than the end face of the lower end of electrode.
With regard to three-phase alternating current mineral hot furnace of the present invention, in order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
A kind of three-phase alternating current mineral hot furnace, comprise the electrode in the burner hearth being vertically arranged in described three-phase alternating current mineral hot furnace, described electrode inserts in the furnace charge in burner hearth, during smelting, furnace charge is heated by electrode current, from top to bottom form furnace charge layer successively, conversion zone and melting layer, wherein, the corresponding conversion zone of lower end of electrode, the liquid form product of melting layer flows out from plug for outlet, also comprise the high-temperature insulation device be arranged in burner hearth, burner hearth corresponding to furnace charge floor is longitudinally divided into several along it and smelts district by this high-temperature insulation device, thus make between each smelting district insulated from each other, the corresponding electrode in each smelting district.
This three-phase alternating current mineral hot furnace is that three-phase three electrode exchanges mineral hot furnace, described high-temperature insulation device is made up of three pieces of heat resistance insulating sheets, the burner hearth of described three-phase alternating current mineral hot furnace is cylindric, described three pieces of heat resistance insulating sheets vertically insert in the burner hearth corresponding to furnace charge layer respectively, and their side combines connection in the central axis place of burner hearth, their another side is connected with the respective inner walls of burner hearth respectively, thus the burner hearth corresponding to furnace charge floor is longitudinally divided into three completely isolated in radial directions and smelting districts of insulation along it.
This three-phase alternating current mineral hot furnace is that three-phase three electrode exchanges mineral hot furnace, described high-temperature insulation device is made up of three pieces of heat resistance insulating sheets, the burner hearth of described three-phase alternating current mineral hot furnace is cylindric, described three pieces of heat resistance insulating sheets vertically insert in the burner hearth corresponding to furnace charge layer respectively, and their side leaves longitudinal gap and/or their another side respectively and leave longitudinal gap between the respective inner walls of burner hearth in the central axis place of burner hearth, thus the burner hearth corresponding to furnace charge floor is longitudinally divided into three smelting districts along it, each smelting district is interconnected by furnace charge at gap location.
This three-phase alternating current mineral hot furnace is that three-phase six-electrode exchanges mineral hot furnace, described high-temperature insulation device is made up of five pieces of heat resistance insulating sheets, the burner hearth of described three-phase alternating current mineral hot furnace is rectangular-shaped, described five pieces of heat resistance insulating sheets vertically to insert in the burner hearth corresponding to furnace charge layer and all parallel with same a pair mutually opposing sidewall of burner hearth respectively, another of this burner hearth is connected with the respective side edge of these heat resistance insulating sheets mutually opposing sidewall, thus the burner hearth corresponding to furnace charge floor is longitudinally divided into six completely isolated in the direction of the width and smelting districts of insulation along it.
This three-phase alternating current mineral hot furnace is that three-phase six-electrode exchanges mineral hot furnace, described high-temperature insulation device is made up of five pieces of heat resistance insulating sheets, the burner hearth of described three-phase alternating current mineral hot furnace is rectangular-shaped, described five pieces of heat resistance insulating sheets vertically to insert in the burner hearth corresponding to furnace charge layer and all parallel with same a pair mutually opposing sidewall of burner hearth respectively, another of this burner hearth leaves longitudinal gap between mutually opposing sidewall and the respective side edge of these heat resistance insulating sheets, thus the burner hearth corresponding to furnace charge floor is longitudinally divided into six smelting districts along it, each smelting district is interconnected by furnace charge at gap location.
The lower surface of described heat resistance insulating sheet is all positioned at more than the end face of the lower end of electrode.
Furnace charge floor in three-phase alternating current mineral hot furnace is longitudinally divided into several along it and smelts district by method of the present invention, insulated from each other between each smelting district, the corresponding electrode in each smelting district, so just can realize the stable of furnace charge layer resistance and maximize, the furnace charge layer branch current between the electrode of three-phase alternating current mineral hot furnace is made to be down to minimum, resistance again due to conversion zone and molten bath is relatively stable, resistance in the stove of at this moment whole three-phase alternating current mineral hot furnace is comparatively stable comparatively speaking, the electric energy of such input three-phase alternating current mineral hot furnace just can act on conversion zone and melting layer to greatest extent, the basic load of transformer is the resistive load in stove, therefore the working of a furnace is more stable, in this case, higher secondary voltage and lower secondary current can be used, three-phase alternating current mineral hot furnace full load is run, at this moment the voltage and current of electrode tip electric arc is all larger, arc radius and arc length then can improve a lot relatively, thus three-phase alternating current mineral hot furnace conversion zone and melting layer area are expanded, bottom temperature remains at the very high level needed for smelting, thus reach the object of Increasing Production and Energy Saving, the electrical efficiency of three-phase alternating current mineral hot furnace in this case, power factor (PF), utilization rate of electrical will significantly improve, even do not need reactive-load compensation just can meet the requirement of power factor (PF) under certain condition, at this moment the utilization rate of electric energy and electrical efficiency very high.
Mineral hot furnace of the present invention adopts high-temperature insulation device that the burner hearth corresponding to furnace charge floor is longitudinally divided into several smelting districts along it, thus make between each smelting district insulated from each other, and in each smelting district, an electrode is set, during work, just can realize the stable of furnace charge layer resistance and maximize, the furnace charge layer branch current between the electrode of three-phase alternating current mineral hot furnace is made to be down to minimum, resistance again due to conversion zone and melting layer is relatively stable, resistance in the stove of at this moment whole three-phase alternating current mineral hot furnace is comparatively stable comparatively speaking, the electric energy of such input three-phase alternating current mineral hot furnace just can act on conversion zone and melting layer to greatest extent, electrode can be stablized to greatest extent and go deep into the operation of furnace charge layer, therefore the three-phase alternating current mineral hot furnace working of a furnace of the present invention is more stable, thus improve utilization rate and the electrical efficiency of electric energy, reach the object of energy-saving and production-increase.
Accompanying drawing explanation
Fig. 1 is existing three-phase alternating current mineral hot furnace basic functional principle schematic diagram;
Fig. 2 is method operation principle schematic diagram of the present invention;
Fig. 3 is the top view of a kind of three-phase alternating current mineral hot furnace of the present invention;
Fig. 4 is that Fig. 3 a-a is intended to cross-section illustration;
Fig. 5 is the top view of another kind of three-phase alternating current mineral hot furnace of the present invention;
Fig. 6 is that Fig. 5 b-b is intended to cross-section illustration;
Fig. 7 is the top view of another three-phase alternating current mineral hot furnace of the present invention;
Fig. 8 is the top view of another three-phase alternating current mineral hot furnace again of the present invention.
Detailed description of the invention
For can technical characteristic of the present invention and effect be described in detail, and can realize according to the content of this description, below in conjunction with accompanying drawing, embodiments of the present invention be further illustrated.
In order to be illustrated more clearly in three-phase alternating current mineral hot furnace furnace control method of the present invention, the thinking of method of the present invention is first described in conjunction with existing three-phase alternating current mineral hot furnace basic functional principle, see Fig. 1, for existing three-phase alternating current mineral hot furnace operation principle schematic diagram is (in order to simplify, only schematically depict two electrode 2B, 2C), arrow in figure represents electric current and flow direction thereof, existing three-phase alternating current mineral hot furnace comprises body of heater 1 and is vertically arranged in the electrode 2B in the burner hearth of this three-phase alternating current mineral hot furnace, 2C, electrode 2B, 2C inserts in furnace charge, after load melting during work, three layers are divided in three-phase alternating current mineral hot furnace, the furnace charge layer 4 that uppermost one deck is, the second layer is the conversion zone 5 of load melting formation, third layer and orlop are the melting layers 6 that melt (liquid form product) is formed, electric current flows into from a wherein electrode 2B, at two electrode 2B, furnace charge layer 4 between 2C, conversion zone 5 and melting layer 6 form branch current respectively, then flow out after another root electrode 2C place converges, because the branch current of furnace charge layer 4 is excessive, electric current is by electrode 2B, furnace charge layer 4 between 2C also can produce a large amount of heats, furnace charge layer 4 is caused to be preheated seriously undue and to make the resistance of furnace charge layer 4 less, thus cause furnace charge layer 4 branch current too large, furnace charge layer 4 work done is too many, furnace charge layer 4 work done is more, furnace charge layer 4 temperature will be aggravated raise, furnace charge layer 4 resistance is declined further, such formation vicious circle, the overheated charge level that makes of last furnace charge layer 4 lumps, form a large amount of red material, even produce fusion hole, cause charge level poor air permeability and material spray phenomenon of collapsing, rise fall of electrodes is frequent, working of a furnace extremely unstable, on the other hand, because transformer capacity is certain, its fan-out capability is limited, and the aggravation of furnace charge layer 4 work done must cause conversion zone 5 and melting layer 6 work done reduction and three-phase alternating current mineral hot furnace stove overload operation, causes the electrical efficiency of three-phase alternating current mineral hot furnace, power factor (PF), utilization rate of electrical not high.
According to the above, stablize the whole three-phase alternating current mineral hot furnace working of a furnace to reach the object of Increasing Production and Energy Saving, resistance in the stove that key is to stablize whole three-phase alternating current mineral hot furnace, because the resistance of conversion zone 5 and molten bath layer 6 is relatively stable, and resistance in stove to be stablized, the crucial resistance being again stable furnace charge layer 4, based on this thinking, the present invention proposes a kind of three-phase alternating current mineral hot furnace furnace control method, and existing 2 pairs of the method are by reference to the accompanying drawings described.
See Fig. 2, be method operation principle schematic diagram of the present invention (in order to simplify, also only schematically depict two electrodes 2B, 2C), the arrow in figure represents electric current and flow direction thereof.A kind of three-phase alternating current mineral hot furnace furnace control method of the present invention, three-phase alternating current mineral hot furnace has body of heater 1, this three-phase alternating current mineral hot furnace comprises the electrode 2B be vertically arranged in its burner hearth, 2C, electrode 2B, 2C inserts in the furnace charge in burner hearth, during smelting, furnace charge is by electrode 2B, 2C current flow heats, from top to bottom form furnace charge layer 4 successively, conversion zone 5 and melting layer 6, wherein, electrode 2B, the corresponding conversion zone 5 of lower end part of 2C, the liquid form product of melting layer 6 flows out from plug for outlet 9, furnace charge floor 4 in burner hearth is longitudinally divided into several along it and smelts district, insulated from each other between each smelting district, such as resemble Fig. 2 and the object that high-temperature insulation band 3 can reach insulation is set between each smelting district, the corresponding electrode in each smelting district, the quantity of namely smelting district is identical with the quantity of electrode, and the quantity of electrode should meet the quantity of three-phase alternating current mineral hot furnace operation principle.Such technical scheme is adopted to be equivalent to increase electrode (electrode 2B in such as Fig. 2 between two, the resistance of furnace charge layer 4 2C), so very little by the electric current of the furnace charge layer 4 between two between electrode, namely furnace charge layer 4 branch current between two between electrode can be down to minimum, electric current is very little to furnace charge layer 4 work done, furnace charge layer 4 generates heat very slight, thus the resistance of whole furnace charge layer 4 is also relatively stable, the working of a furnace is also relatively stable, so just can use higher secondary voltage as much as possible and allow electrode is stable to be goed deep into furnace charge layer 4 and run, in order to the conversion zone 5 and the melting layer 6 that make electric energy in input stove act on electrode tip to greatest extent, electrode 2B, the lower end part of 2C answers corresponding conversion zone 5, namely lower surface insulated from each other between each smelting district should be more than furnace charge floor 4 in burner hearth and the interface between conversion zone 5, to obtain electrical efficiency large as far as possible and utilization rate of electrical, reduce product unit power consumption, in order to reduce as much as possible or stop furnace charge floor 4 work done and avoid lower surface insulated from each other between each smelting district to be damaged by high arc temperature and lose the effect of insulation, this respectively smelts the above correct position of end face that the degree of depth going deep into furnace charge floor 4 in lower surface insulated from each other between district should be positioned at electrode tip, and each distance of smelting between district between lower surface insulated from each other and the end face of electrode tip remains on 10cm and more than 10cm for better.
Known by describing above, adopt method of the present invention can change uncertainty and the complexity of operated in accordance with conventional methods, furnace control is simplified more; Adopt method of the present invention, furnace gas can be utilized to carry out abundant preheating to furnace charge, then reenter stove, rotary kiln-three-phase alternating current mineral hot furnace method route can be adopted, the consumption of electric furnace to electric energy can be reduced further like this, reduce product specific energy consumption further; Adopt method of the present invention, the electric geometric parameter of three-phase alternating current mineral hot furnace can to a certain degree be exaggerated, thus can improve the production capacity of three-phase alternating current mineral hot furnace further.
Below by citing, three-phase alternating current mineral hot furnace furnace control method of the present invention is described in detail.
Such as, when furnace of calcium carbide is smelted and is adopted method of the present invention, the quick lime in furnace charge can be utilized furnace charge floor 4 to be separated into three and to smelt districts' (smelting the quantity that the quantity in district and the quantity of electrode identical with the quantity of electrode should meet three-phase alternating current mineral hot furnace operation principle), namely utilize and the high temperature resistant and furnace charge of good insulation preformance (quick lime of furnace of calcium carbide) one can be formed extend simultaneously along the high-temperature insulation band 3 that burner hearth radial direction extends along furnace depth direction, like this furnace charge floor 4 between two between electrode is separated into three smelt district and insulate, structure as shown in Figure 3, then smelting work is carried out according to existing production process, also heat resistance insulating sheet can be adopted in certain the present embodiment to form high-temperature insulation band 3, the object of stable furnace condition can be reached equally, that is, high-temperature insulation band 3 can be not limited to form (as heat resistance insulating sheet or the high-temperature insulation band that is made up of the high temperature resistant and mineral hot furnace raw material of good insulation preformance), also shape (if high-temperature insulation band 3 can be plane or curved surface) is not limited to as long as the effect of high-temperature insulation can be reached, just can realize object of the present invention.
Below three-phase alternating current mineral hot furnace of the present invention is described.
Embodiment one
See Fig. 3 and Fig. 4, be a kind of three-phase alternating current mineral hot furnace of the present invention, be that a kind of three-phase three electrode exchanges mineral hot furnace, comprise body of heater 1, vertically be arranged in three electrode 2A in burner hearth, 2B, 2C and the high-temperature insulation device 3 ' be arranged in burner hearth, electrode 2A, 2B, 2C inserts in the furnace charge in burner hearth, and during smelting, furnace charge is by electrode 2A, 2B, 2C current flow heats, from top to bottom forms furnace charge layer 4 successively, conversion zone 5 and melting layer 6, wherein, electrode 2A, 2B, the corresponding conversion zone 5 of lower end part of 2C, the liquid form product of melting layer 5 flows out from plug for outlet 10, this high-temperature insulation device 3 ' is made up of three pieces of heat resistance insulating sheets, the burner hearth that this three electrode exchanges mineral hot furnace is cylindric, these three pieces of heat resistance insulating sheets vertically insert in the burner hearths corresponding to furnace charge layers 4 respectively and their side combines in the central axis place of burner hearth and connects, another side of these three pieces of heat resistance insulating sheets is connected with the respective inner walls of burner hearth respectively, thus the burner hearth corresponding to furnace charge floor 4 is longitudinally divided into three completely isolated in radial directions and smelting district 4-1 of insulation along it, 4-2, 4-3, thus make between each smelting district insulated from each other, in these three smelting districts, correspondence arranges electrode 2A respectively, electrode 2B and electrode 2C.
Embodiment two
See Fig. 5 and Fig. 6, be another kind of three-phase alternating current mineral hot furnace of the present invention, be that a kind of three-phase six-electrode exchanges mineral hot furnace, comprise body of heater 1, vertically be arranged in the electrode 2A in the burner hearth of this three-phase alternating current mineral hot furnace, 2B, 2C and 2X, 2Y, 2Z and the high-temperature insulation device 3 ' be arranged in burner hearth, electrode 2A, 2B, 2C and 2X, 2Y, 2Z inserts in the furnace charge in burner hearth, and during smelting, furnace charge is by electrode 2A, 2B, 2C and 2X, 2Y, 2Z current flow heats, from top to bottom forms furnace charge layer 4 successively, conversion zone 5 and melting layer 6, wherein, electrode 2A, 2B, 2C and 2X, 2Y, the corresponding conversion zone 5 of lower end part of 2Z, the liquid form product of melting layer 6 flows out from plug for outlet 10, this high-temperature insulation device 3 ' is made up of five pieces of heat resistance insulating sheets, these heat resistance insulating sheet upper ends are connected with a hydraulic jack 8 respectively, these hydraulic jacks 8 are fixed on mineral hot furnace petticoat pipe 7, insulator foot 9 is lined with between hydraulic jack 8 and mineral hot furnace petticoat pipe 7, like this these heat resistance insulating sheets to be hung in furnace charge layer 4 and to be driven can be moved up and down by hydraulic jack 8, thus the degree of depth that these heat resistance insulating sheets insert furnace charge layer 4 can be adjusted, the burner hearth of this three-phase alternating current mineral hot furnace is rectangular-shaped, these five pieces of heat resistance insulating sheets vertically to insert in burner hearths and all parallel with same a pair mutually opposing sidewall of burner hearth respectively, another of this burner hearth is connected with the respective side edge of these heat resistance insulating sheets mutually opposing sidewall, thus the burner hearth corresponding to furnace charge floor 4 is longitudinally divided into six completely isolated in the direction of the width and smelting district 4-1 of insulation along it, 4-2, 4-3, 4-4, 4-5, 4-6, thus make between each smelting district insulated from each other, in these six smelting districts, correspondence arranges electrode 2A respectively, electrode 2X, electrode 2B, electrode 2Y, electrode 2C and electrode 2Z.
In above-mentioned two embodiments, conversion zone 5 and melting layer 6 is acted on to greatest extent in order to make electric energy in input stove, the lower end part of electrode 2A, 2B, 2C or 2A, 2B, 2C, 2X, 2Y, 2Z is corresponding with conversion zone 4, namely the lower surface of heat resistance insulating sheet should be positioned on the lower surface of the burner hearth corresponding to furnace charge layer 4 of burner hearth, to improve electrical efficiency and utilization rate of electrical, reduce product unit power consumption; In order to reduce as much as possible or stop furnace charge layer 4 work done and avoid the lower surface of heat resistance insulating sheet to be damaged by high arc temperature and lose dielectric separation effect, the lower surface of heat resistance insulating sheet should be positioned at more than the end face of electrode tip, and the distance between the end face of the lower surface of heat resistance insulating sheet and electrode 2A, 2B, 2C or 2A, 2B, 2C, 2X, 2Y, 2Z termination remains on 10cm and more than 10cm for better.
In above-mentioned two embodiments, burner hearth is cylindric or rectangular-shaped, and this burner hearth can also be other shapes, such as prism-frustum-shaped or be oval column in horizontal cross-section; The quantity of electrode is not limited only to three or the six roots of sensation, can also be other quantity meeting three-phase alternating current mineral hot furnace operation principle, in this case, the quantity in the smelting district that the burner hearth corresponding to furnace charge floor 4 is longitudinally divided into along it should and one_to_one corresponding equal with the quantity of now electrode be arranged, and namely arranges an electrode in each smelting district; Heat resistance insulating sheet is not only confined to the plate of plane, it can also be the plate of curved surface, composition high-temperature insulation device 3 ' is not only confined to heat resistance insulating sheet, can also be other suitable shape or forms, high temperature resistant and the furnace charge of good insulation preformance (quick lime as furnace of calcium carbide) one can be formed extend simultaneously along the movable insulating tape that burner hearth radial direction extends along furnace depth direction as utilized, like this furnace charge floor 4 between two between electrode is smelted district and insulated, that is, as long as the effect of high-temperature insulation can be reached.
In above-mentioned two embodiments, the smelting district that burner hearth corresponding to furnace charge floor 4 is divided into by high-temperature insulation device 3 ' width or be in the radial direction completely isolated and insulation, also can be not exclusively isolate and insulate as shown in Figure 7 and Figure 8 like that, namely according to the actual working of a furnace of different mineral hot furnaces, also gap can be left between the respective side edge of heat resistance insulating sheet and/or between the side of heat resistance insulating sheet and the inwall of burner hearth, each smelting district is interconnected by furnace charge at gap location, also can reach object of the present invention.
In addition, it should be noted that, the material making above-mentioned high-temperature insulation device 3 ' or heat resistance insulating sheet can be selected from existing material, selection requirements is: resistant to elevated temperatures temperature should be not less than the highest smelting temperature in three-phase alternating current mineral hot furnace, and the highest secondary voltage of transformer that insulating properties are tackled in three-phase alternating current mineral hot furnace can reliably insulate.
Above with reference to embodiment to invention has been detailed description, be illustrative and not restrictive, in the change do not departed under general plotting of the present invention and amendment, all within protection scope of the present invention.
Claims (8)
1. a three-phase alternating current mineral hot furnace furnace control method, there is in the burner hearth of described three-phase alternating current mineral hot furnace the electrode vertically arranged, described electrode inserts in the furnace charge in burner hearth, during smelting, furnace charge is heated by electrode current, from top to bottom form furnace charge layer successively, conversion zone and melting layer, wherein, the corresponding conversion zone of lower end of electrode, the liquid form product of melting layer flows out from plug for outlet, it is characterized in that, furnace charge floor in described burner hearth is longitudinally divided into several along it and smelts district, insulated from each other between each smelting district, the corresponding electrode in each smelting district, the highest secondary voltage of transformer that between described smelting district, performance insulated from each other is tackled in three-phase alternating current mineral hot furnace can reliably insulate, and the resistant to elevated temperatures temperature of its part insulated from each other should be not less than the highest smelting temperature in three-phase alternating current mineral hot furnace, to ensure reliably to insulate each other between described smelting district, thus make the furnace charge layer branch current between two between electrode of three-phase alternating current mineral hot furnace be down to minimum.
2. three-phase alternating current mineral hot furnace furnace control method according to claim 1, is characterized in that, between described each smelting district, lower surface insulated from each other is positioned at more than the end face of the lower end of electrode.
3. a three-phase alternating current mineral hot furnace, comprise the electrode in the burner hearth being vertically arranged in described three-phase alternating current mineral hot furnace, described electrode inserts in the furnace charge in burner hearth, during smelting, furnace charge is heated by electrode current, from top to bottom form furnace charge layer successively, conversion zone and melting layer, wherein, the corresponding conversion zone of lower end of electrode, the liquid form product of melting layer flows out from plug for outlet, it is characterized in that, also comprise the high-temperature insulation device be arranged in burner hearth, burner hearth corresponding to furnace charge floor is longitudinally divided into several along it and smelts district by this high-temperature insulation device, thus make between each smelting district insulated from each other, the corresponding electrode in each smelting district, the highest secondary voltage of transformer that these high-temperature insulation device insulating properties are tackled in three-phase alternating current mineral hot furnace can reliably insulate, and its resistant to elevated temperatures temperature should be not less than the highest smelting temperature in three-phase alternating current mineral hot furnace, to ensure reliably to insulate each other between the furnace charge of high-temperature insulation device both sides, thus make the furnace charge layer branch current between two between electrode of three-phase alternating current mineral hot furnace be down to minimum.
4. three-phase alternating current mineral hot furnace according to claim 3, it is characterized in that, this three-phase alternating current mineral hot furnace is that three-phase three electrode exchanges mineral hot furnace, described high-temperature insulation device is made up of three pieces of heat resistance insulating sheets, the burner hearth of described three-phase alternating current mineral hot furnace is cylindric, described three pieces of heat resistance insulating sheets vertically insert in the burner hearth corresponding to furnace charge layer respectively, and their side combines connection in the central axis place of burner hearth, their another side is connected with the respective inner walls of burner hearth respectively, thus the burner hearth corresponding to furnace charge floor is longitudinally divided into three completely isolated in radial directions and smelting districts of insulation along it.
5. three-phase alternating current mineral hot furnace according to claim 3, it is characterized in that, this three-phase alternating current mineral hot furnace is that three-phase three electrode exchanges mineral hot furnace, described high-temperature insulation device is made up of three pieces of heat resistance insulating sheets, the burner hearth of described three-phase alternating current mineral hot furnace is cylindric, described three pieces of heat resistance insulating sheets vertically insert in the burner hearth corresponding to furnace charge layer respectively, and their side leaves longitudinal gap and/or their another side respectively and leave longitudinal gap between the respective inner walls of burner hearth in the central axis place of burner hearth, thus the burner hearth corresponding to furnace charge floor is longitudinally divided into three smelting districts along it, each smelting district is interconnected by furnace charge at gap location.
6. three-phase alternating current mineral hot furnace according to claim 3, it is characterized in that, this three-phase alternating current mineral hot furnace is that three-phase six-electrode exchanges mineral hot furnace, described high-temperature insulation device is made up of five pieces of heat resistance insulating sheets, the burner hearth of described three-phase alternating current mineral hot furnace is rectangular-shaped, described five pieces of heat resistance insulating sheets vertically to insert in the burner hearth corresponding to furnace charge layer and all parallel with same a pair mutually opposing sidewall of burner hearth respectively, another of this burner hearth is connected with the respective side edge of these heat resistance insulating sheets mutually opposing sidewall, thus the burner hearth corresponding to furnace charge floor is longitudinally divided into six completely isolated in the direction of the width and smelting districts of insulation along it.
7. three-phase alternating current mineral hot furnace according to claim 3, it is characterized in that, this three-phase alternating current mineral hot furnace is that three-phase six-electrode exchanges mineral hot furnace, described high-temperature insulation device is made up of five pieces of heat resistance insulating sheets, the burner hearth of described three-phase alternating current mineral hot furnace is rectangular-shaped, described five pieces of heat resistance insulating sheets vertically to insert in the burner hearth corresponding to furnace charge layer and all parallel with same a pair mutually opposing sidewall of burner hearth respectively, another of this burner hearth leaves longitudinal gap between mutually opposing sidewall and the respective side edge of these heat resistance insulating sheets, thus the burner hearth corresponding to furnace charge floor is longitudinally divided into six smelting districts along it, each smelting district is interconnected by furnace charge at gap location.
8. the three-phase alternating current mineral hot furnace according to any one of claim 4 to 7, is characterized in that, the lower surface of described heat resistance insulating sheet is all positioned at more than the end face of the lower end of electrode.
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| CN104486859B (en) * | 2014-12-19 | 2016-02-03 | 成都高威节能科技有限公司 | Electrodes in mine hot stove acting point is from the method for motion tracking bath surface track |
| CN106766972B (en) * | 2016-12-14 | 2019-02-19 | 内蒙古鄂尔多斯电力冶金集团股份有限公司 | A kind of charge level control method of three-phase alternating current mineral hot furnace |
| CN107401917A (en) * | 2017-09-15 | 2017-11-28 | 巴涌 | One kind is without interpolar branch current ore-smelting electric furnace |
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