CN102910799A - Heating electrode and alkali-free boron-free aluminosilicate glass melting furnace with same - Google Patents
Heating electrode and alkali-free boron-free aluminosilicate glass melting furnace with same Download PDFInfo
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- CN102910799A CN102910799A CN2012103601580A CN201210360158A CN102910799A CN 102910799 A CN102910799 A CN 102910799A CN 2012103601580 A CN2012103601580 A CN 2012103601580A CN 201210360158 A CN201210360158 A CN 201210360158A CN 102910799 A CN102910799 A CN 102910799A
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Abstract
The invention discloses a heating electrode and an alkali-free boron-free aluminosilicate glass melting furnace with the same. The alkali-free boron-free aluminosilicate glass melting furnace comprises a melting furnace body which is a melting end, a plurality of heating electrodes are mounted at the pool bottom of the melting end, each heating electrode comprises a semispherical electrode which is a molybdenum electrode, a power source is connected to each electrode through a cable, a cooling water jacket is arranged below each electrode, and each cooling water jacket and the corresponding electrode are connected by a silver piece. The electrodes arranged at the pool bottom of the melting furnace are the semispherical molybdenum electrodes and long in service life and can be used in a whole melting furnace cycle, so that influences of damage of the electrodes on glass melting are avoided, and cost can be reduced by less molybdenum consumption.
Description
Technical field
The present invention relates to the glass melter technical field, particularly a kind of heating electrode and have the silicate glass containing boron and aluminium without alkali melting furnaces of this heating electrode.
Background technology
Silicate glass containing boron and aluminium without alkali has a series of good characteristics such as thermal expansivity is low, physical strength is high, chemical stability is good, high temperature resistant, is widely applied.Because silicon-dioxide and alumina content were high during glass formed, glass is infusibilized, and high temperature viscosity is large, clarification homogenizing difficulty, and for obtaining transparent even flawless glass, required temperature of fusion is high, generally will be higher than 1600 ℃; The boron volatile quantity is large under the high temperature, and the glass metal surface easily produces Si-rich phase, makes glass produce the defectives such as striped.Usually glass melter adopts the flame heating mostly because the thermal conductivity of glass metal and mobile relatively poor, and bottom glass liquid from flame away from, thereby the bottom glass liquid temp is lower so that the bottom produces stagnant layer, the easy crystallization of glass and affect the quality of glass.If only depend on the raising flame temperature to improve the bottom glass liquid temp, then can aggravate the volatilization of boron, the flame space temperature is too high in addition, can aggravate the erosion of melting furnaces refractory materials again, thereby produces more glass defect, shortens the work-ing life of melting furnaces.The alkali-free boroaluminosilicate is very high to the specification of quality of glass, and glass defect is many during with traditional flame melting furnaces fusing silicate glass containing boron and aluminium without alkali, qualification rate is low.Tradition flame melting furnaces upper space temperature is higher, and more from the heat radiation of kiln top and breastwork, high-temperature exhaust emission has been taken away amount of heat in addition, therefore traditional flame melting furnaces thermo-efficiency is low.
The deficiency of bringing for overcoming simple flame, VoelkerShi in 1902 obtain the patent of energising heating, molten glass in frit, and the SauvegeonShi of France in 1907 obtains the patent right of energising smelting furnace.
The mode of electric smelting has four kinds:
(1) direct-electrifying, the joule heating molten glass that namely utilizes electric current in glass metal, to produce;
(2) utilize the radiation of resistance heater, carry out indirect heating;
(3) adopt simultaneously the mode of above-mentioned (1) (2);
(4) ratio-frequency heating.
Relatively the method for (1)～(4) is extensively adopted by glass industry because the utilization efficiency of heat energy of method (1) is high.
Electricity fusing-aid is the electroconductibility of utilizing high temperature lower-glass liquid, by electrode in the insertion bottom glass liquid electric current is introduced in the glass metal, two interelectrode glass metals produce joule heating under the effect of electric current, thereby improve the temperature of bottom glass liquid, accelerate the fusing of admixtion, the clarification and homogenization of glass metal.
The advantage of electricity fusing-aid:
(1) improves the glass melting quality, to the whole heating of glass metal homogeneous, so can obtain homogeneous glass.
(2) can preserve volatile component in the raw material, with the flame burner ratio, owing to having improved the bottom glass liquid temp, the temperature of top flame space can suitably reduce, thereby has reduced the volatilization of volatile component.
(3) reduce topsoil, because fuel reduces, the corresponding minimizing of products of combustion, and volatile matter minimizing, the waste gas and the Dust Capacity that are discharged into atmosphere reduce, so reduced topsoil.
(4) production adaptative ability is strong, can regulate melting capacity by regulating electric power, satisfies need of production.
Compare with the flame melting furnaces, electricity fusing-aid is owing to having improved the bottom glass liquid temp, and glass metal is very fast to the erosion of refractory materials, needs to adopt high-quality refractory materials, to overcome the shortening of the bad and melting furnace life-span of glass that refractory corrosion brings.
Generally the heating electrode as electricity fusing-aid has: stannic oxide electrode, platinum electrode and molybdenum electrode.
Traditional stannic oxide electrode is owing to use temperature low (below 1500 ℃), reductibility are strong, poor thermal shock resistance has limited this electrode use.Because the silicate glass containing boron and aluminium without alkali temperature of fusion is high, the glass metal erosional competency is strong, is not suitable for using traditional stannic oxide electrode.
Platinum electrode is because very large by the electric current of electrode, and electrode tip easily makes the platinum electrode excessive loss because current density is excessive.Platinum is a kind of rare precious metals, and is expensive, and the life-span of electrode has not only been shortened in the loss of electrode, and cost is risen, and the platinum particle that loss produces causes product defects, affects quality product.
Molybdenum electrode is high temperature resistant because of its fusing point height, the conductivity performance is good, anticorrosive and be difficult for making the advantages such as glass coloring to be widely used in the heating electrode of opticglass, glass fibre, borosilicate glass melting furnaces.Shortcoming is expensive, and size and shape is restricted.
Adopt the glass melter of molybdenum electrode heating, the structure of molybdenum electrode and use directly affect the work-ing life of molybdenum electrode, thereby directly affect the work-ing life of refining quality and the melting furnaces of glass.The molybdenum electrode of carrying all is bar-shaped molybdenum electrodes among patent CN1041858A, CN1762865A, CN1837110A, CN102209408A, the CN201334426Y.Because bar-shaped molybdenum electrode diameter is less, add the heat request needs and do very longly for satisfying, stretch into the about 500-700mm of length of glass metal, so just determined the many and easy damage of the required Mo of bar-shaped molybdenum electrode, the one, easily fracture in the heating-up furnace temperature-rise period, the 2nd, the electrode root is easily oxidized in the use procedure corrodes and fracture with glass metal.After the lead rupture, glass can not normally melt, and easily produces glass defect, affects glass quality.Unaffected in order to ensure electricity fusing-aid, common way is with the jacking in the glass metal of an electrode that couples together, and needs to have a power failure, stop water coolant in the process of jacking, and is very large on the impact of glass melting.The watercooling jacket break accident easily occurs when having pushed up rear logical water coolant, and rear jacket water temperature is high because cutting off the water, due to water vapor is expanded.If electrode damage can't be repaired, then glass melting can't normally carry out, the melting furnaces cold repair of only stopping.
Molybdenum electrode described in the patent CN101921051A is mounted on the pool wall, is unfavorable for improving the temperature of bottom glass liquid, is unfavorable for giving full play to the effect of electricity fusing-aid.
Summary of the invention
The technical issues that need to address of the present invention are that existing molybdenum electrode is bar-shaped, and the many and easy damage of required Mo not only affects glass quality but also affects production schedule.
For solving the problems of the technologies described above, the invention provides a kind of heating electrode of glass melter, comprise electrode, the shape of described electrode is that semicircle is spherical, power supply is connected to described electrode by cable, described electrode is molybdenum electrode, described electrode below is provided with watercooling jacket, be connected by silver strip between described watercooling jacket and electrode, be provided with device for detecting temperature at cooling water outlet, also be provided with warning device in melting furnaces operation watch-keeping cubicle, the surface current density of described electrode is evenly distributed, and described electrode is that 99.96% Mo is made.
The present invention also provides a kind of silicate glass containing boron and aluminium without alkali melting furnaces with this heating electrode, comprise the melting furnaces main body, described melting furnaces main body is melting end, on a plurality of heating electrodes are installed at the bottom of the pond of described melting end, described heating electrode comprises electrode, the shape of described electrode is that semicircle is spherical, power supply is connected to described electrode by cable, described electrode is molybdenum electrode, and described electrode below is provided with watercooling jacket, is connected by silver strip between described watercooling jacket and electrode, be provided with device for detecting temperature at cooling water outlet, also be provided with warning device in melting furnaces operation watch-keeping cubicle, the surface current density of described electrode is evenly distributed, and described electrode is that 99.96% Mo is made.
As the preferred technical solution of the present invention, described melt portions is territory, charging opening lateral areas, middle section and territory, dog-hole lateral areas, be equipped with 2～4 pairs of heating electrodes in each zone, and described heating electrode is arranged symmetrically with along described melting furnaces main center line, the electrical heating power of the heating electrode in territory, described charging opening lateral areas, middle section and territory, dog-hole lateral areas is set separately respectively and is adjusted, and is set as and decides power control mode or decide current control mode; The pond bottom electrode brick that the melting end of heating electrode is installed adopts the strong high zirconia block of anti-glass metal erosional competency.
As a further improvement on the present invention, the breastwork in described melting end both sides is provided with total oxygen and burns rifle, and every pleurobranch wall is provided with total oxygen burning rifle 1-6 and props up, and the both sides total oxygen burns the rifle Heterogeneous Permutation, is provided with 1-2 flue on gable wall or the arch top in territory, charging opening lateral areas.
Silicate glass containing boron and aluminium without alkali melting furnaces of the present invention, on heating electrode is provided in a side of at the bottom of the melting end pond of melting furnaces main body, purpose is in order to improve the temperature of bottom glass liquid, to improve the convection current of glass metal, reduce melting end upper space temperature reduces the volatilization of boron.Be the temperature of balance melting end upper space, satisfy the glass melting needs, the breastwork in the melting end both sides is provided with total oxygen and burns rifle, the both sides total oxygen burns the rifle Heterogeneous Permutation, avoid increasing port coverage to burning and the flame collision, arranging of flue can be discharged the waste gas that flame produces.Electricity fusing-aid of the present invention is owing to having improved the bottom glass liquid temp, glass metal is accelerated the erosion of refractory materials, for overcoming the shortening of the bad and melting furnace life-span of glass that refractory corrosion brings, the pond bottom electrode brick that heating electrode is installed adopts the high zirconia block of the strong zirconia content about 95% of anti-glass metal erosional competency.
The invention has the beneficial effects as follows: compare with the electrode of prior art, at first, the electrode of silicate glass containing boron and aluminium without alkali melting furnaces is made by 99.96% Mo, fusing point is up to 2620 ℃, be particularly suitable for the requirement of infusibility silicate glass containing boron and aluminium without alkali high temperature melting, and can not pollute glass.The second, the electrode on being located at the bottom of the melting end pond is molybdenum electrode, and molybdenum electrode is that semicircle is spherical, the used Mo of semicircle sphere pole is few, can reduce cost, and the spherical molybdenum electrode heat resistanceheat resistant vibrations of semicircle performance is good, can fracture, guarantee can both bring into play in the phase at whole kiln the effect of electricity fusing-aid.Phenomenon of rupture as stick electrode can not occur, thereby do not need to cut off the water toward the interior jacking of stove, avoid the impact on fusing.The 3rd, the surface current density of the spherical molybdenum electrode of semicircle is evenly distributed, can not occur local current densities transfinite and occur fine discharge to the electrode injury, produce bubble.The 4th, electrode is provided with watercooling jacket, and coolant water temperature has monitoring device and warning device, and coolant water temperature can effectively be controlled, and good cooling results can effectively prolong electrode life.The 5th, be connected by silver strip between watercooling jacket and electrode, guarantee that contact is good.The 6th, the pond bottom electrode brick that heating electrode is installed adopts the high zirconia block of the strong zirconia content about 95% of anti-glass metal erosional competency, and the glass that can avoid refractory corrosion to bring is bad, prolongs the life-span of melting furnaces.
Silicate glass containing boron and aluminium without alkali melting furnaces of the present invention, the electrode on being located at the bottom of the melting end pond is molybdenum electrode, molybdenum electrode is that semicircle is spherical, long service life can be used in the cycle at whole melting furnaces, avoids electrode damage on the impact of glass melting, and used Mo is few, can reduce cost.
Description of drawings
Fig. 1 is the structural representation of melting furnaces main body of the present invention;
Fig. 2 is the vertical view of Fig. 1;
Fig. 3 is the structural representation of heating electrode of the present invention;
Wherein, 1-melting furnaces main body, the 2-electrode, the 3-cable, the 4-watercooling jacket, the 5-silver strip, the 6-device for detecting temperature, territory, 7-charging opening lateral areas, the 8-middle section, territory, 9-dog-hole lateral areas, the 10-total oxygen burns rifle, 11-flue.
Embodiment
Describe the preferred technical solution of the present invention in detail below in conjunction with accompanying drawing.
As shown in the figure, silicate glass containing boron and aluminium without alkali melting furnaces of the present invention, comprise melting furnaces main body 1, described melting furnaces main body 1 is melting end, on a plurality of heating electrodes are installed at the bottom of the described melting end pond, described heating electrode comprises electrode 2, the shape of described electrode 2 is that semicircle is spherical, and power supply is connected to described electrode 2 by cable 3, and described electrode 2 is molybdenum electrode, described electrode 2 belows are provided with watercooling jacket 4,2 at described watercooling jacket 4 and electrode are connected by silver strip 5, are provided with device for detecting temperature 6 at cooling water outlet, also are provided with warning device in melting furnaces operation watch-keeping cubicle, the surface current density of described electrode 2 is evenly distributed, and described electrode 2 is that 99.96% Mo is made; Described melt portions is territory, charging opening lateral areas 7, middle section 8 and territory, dog-hole lateral areas 9, be equipped with 2～4 pairs of heating electrodes in each zone, and described heating electrode is arranged symmetrically with along described melting furnaces main body 1 medullary ray, the electrical heating power of the heating electrode in territory, described charging opening lateral areas 7, middle section 8 and territory, dog-hole lateral areas 9 is set separately respectively and is adjusted, and is set as and decides power control mode or decide current control mode; The pond bottom electrode brick that the melting end of heating electrode is installed adopts the strong high zirconia block of anti-glass metal erosional competency; Breastwork in described melting end both sides is provided with total oxygen and burns rifle 10, and every pleurobranch wall is provided with 1-6 and props up total oxygen burning rifle 10, and the both sides total oxygen burns rifle 10 Heterogeneous Permutations, is provided with 1-2 flue 11 on gable wall or the arch top in territory, charging opening lateral areas 7.
Electrode of the present invention is provided with watercooling jacket, the material of watercooling jacket is heat-resistance stainless steel, water coolant is cyclic softening water, the flow of control water inlet I or water outlet O is guaranteed the cooling performance of electrode, cooling water outlet has device for detecting temperature and warning device, warning device is installed in melting furnaces operations watch-keeping cubicle, so that operator find that in time water temperature exceeds standard and in time regulate water temperature, cooling water outlet temperature is controlled in 45 ℃.The electrical heating power of territory, charging opening lateral areas, middle section and territory, dog-hole lateral areas heating electrode is set separately respectively and is adjusted, and is set as and decides power control mode or decide current control mode, can satisfy the difference in functionality needs of melting end different positions.Heating electrode can improve the temperature of molten glass to the molten glass direct heating, improves the convection current of glass metal, accelerates the fusing of admixtion, the clarification and homogenization of glass metal, not only can improve the output of melting furnaces, and can improve the quality of glass metal.The electricity fusing-aid heating both can be used separately, was all-electric melting, also can cooperate utilization with the flame heating, electricity fusing-aid heating and flame heating can complement one another, and regulate separately, have increased the operability of melting furnaces, for example, can increase separately or reduce as required the consumption of electricity or fuel.
Heating electrode of the present invention and have the silicate glass containing boron and aluminium without alkali melting furnaces of this heating electrode, on heating electrode is provided in a side of at the bottom of the melting end pond of melting furnaces main body, purpose is in order to improve the temperature of bottom glass liquid, improve the convection current of glass metal, reduce melting end upper space temperature reduces the volatilization of boron.Be the temperature of balance melting end upper space, satisfy the glass melting needs, the breastwork in the melting end both sides is provided with total oxygen and burns rifle, and the both sides total oxygen burns the rifle Heterogeneous Permutation, and avoiding increases port coverage to burning and the flame collision.Arranging of flue can be discharged the waste gas that flame produces.Electricity fusing-aid of the present invention is owing to having improved the bottom glass liquid temp, glass metal is accelerated the erosion of refractory materials, for overcoming the shortening of the bad and melting furnace life-span of glass that refractory corrosion brings, the pond bottom electrode brick that heating electrode is installed adopts the high zirconia block of the strong zirconia content about 95% of anti-glass metal erosional competency.
The invention has the beneficial effects as follows: compare with the electrode of prior art, at first, the electrode of silicate glass containing boron and aluminium without alkali melting furnaces is made by 99.96% Mo, fusing point is up to 2620 ℃, be particularly suitable for the requirement of infusibility silicate glass containing boron and aluminium without alkali high temperature melting, and can not pollute glass.The second, the electrode on being located at the bottom of the melting end pond is molybdenum electrode, and the shape of molybdenum electrode is that semicircle is spherical, the used Mo of semicircle sphere pole is few, can reduce cost, and the spherical molybdenum electrode heat resistanceheat resistant vibrations of semicircle performance is good, can fracture, guarantee can both bring into play in the phase at whole kiln the effect of electricity fusing-aid.Phenomenon of rupture as stick electrode can not occur, thereby do not need to cut off the water toward the interior jacking of stove, avoid the impact on fusing.The 3rd, the surface current density of the spherical molybdenum electrode of semicircle is evenly distributed, can not occur local current densities transfinite and occur fine discharge to the electrode injury, produce bubble, the maximized surface electric current of electrode can reach 1～3A/cm2.The 4th, electrode is provided with watercooling jacket, and coolant water temperature has monitoring device and warning device, and coolant water temperature can effectively be controlled, and good cooling results can effectively prolong electrode life.The 5th, be connected by silver strip between watercooling jacket and electrode, guarantee that contact is good.The 6th, the pond bottom electrode brick that heating electrode is installed adopts the high zirconia block of the strong zirconia content about 95% of anti-glass metal erosional competency, and the glass that can avoid refractory corrosion to bring is bad, prolongs the life-span of melting furnaces.
Heating electrode of the present invention and have the silicate glass containing boron and aluminium without alkali melting furnaces of this heating electrode, electrode on being located at the bottom of the melting end pond is molybdenum electrode, molybdenum electrode is that semicircle is spherical, has simple structure, is easy to realize, is conducive to improve thermo-efficiency, the raising glass quality of glass melter, can cooperate with flame the characteristics such as utilization, long service life can be used in the cycle at whole melting furnaces, avoids electrode damage on the impact of glass melting, and used Mo is few, can reduce cost.
Above-described embodiment only is used for further specifying heating electrode of the present invention and has silicate glass containing boron and aluminium without alkali melting furnaces and the employed heating electrode of this heating electrode; but the present invention is not limited to above-described embodiment; every foundation technical spirit of the present invention all falls into the protection domain of technical solution of the present invention to any simple modification, equivalent variations and modification that above embodiment does.
Claims (10)
1. heating electrode, it is characterized in that: comprise electrode (2), power supply is connected to described electrode (2) by cable (3), and described electrode is molybdenum electrode, described electrode (2) below is provided with watercooling jacket (4), is connected by silver strip (5) between described watercooling jacket (4) and electrode (2).
2. heating electrode as claimed in claim 1, it is characterized in that: the shape of described electrode (2) is that semicircle is spherical.
3. heating electrode as claimed in claim 1 or 2, it is characterized in that: the surface current density of described electrode (2) is evenly distributed, and described electrode (2) is that 99.96% Mo is made.
4. silicate glass containing boron and aluminium without alkali melting furnaces, it is characterized in that: comprise melting furnaces main body (1), described melting furnaces main body (1) is melting end, on a plurality of heating electrodes are installed at the bottom of the pond of described melting end, described heating electrode comprises electrode (2), power supply is connected to described electrode (2) by cable (3), described electrode is molybdenum electrode, described electrode (2) below is provided with watercooling jacket (4), be connected by silver strip (5) between described watercooling jacket (4) and electrode (2), be provided with device for detecting temperature (6) at cooling water outlet, in melting furnaces operation watch-keeping cubicle, also be provided with warning device.
5. silicate glass containing boron and aluminium without alkali melting furnaces as claimed in claim 4, it is characterized in that: the shape of described electrode (2) is that semicircle is spherical, is made by 99.96% Mo, the surface current density of described electrode (2) is evenly distributed.
6. silicate glass containing boron and aluminium without alkali melting furnaces as claimed in claim 4, it is characterized in that: described melt portions is territory, charging opening lateral areas (7), middle section (8) and territory, dog-hole lateral areas (9), be equipped with 2～4 pairs of heating electrodes in each zone, and described heating electrode is arranged symmetrically with along described melting furnaces main body (1) medullary ray.
7. silicate glass containing boron and aluminium without alkali melting furnaces as claimed in claim 6, it is characterized in that: the electrical heating power of the heating electrode in territory, described charging opening lateral areas (7), middle section (8) and territory, dog-hole lateral areas (9) is set separately respectively and is adjusted, and is set as and decides power control mode or decide current control mode.
8. silicate glass containing boron and aluminium without alkali melting furnaces as claimed in claim 4 is characterized in that: the pond bottom electrode brick that the melting end of heating electrode is installed adopts the strong high zirconia block of anti-glass metal erosional competency.
9. such as the described silicate glass containing boron and aluminium without alkali melting furnaces of each claim in the claim 4 to 8, it is characterized in that: the breastwork in described melting end both sides is provided with total oxygen and burns rifle (10), every pleurobranch wall is provided with total oxygen burning rifle (10) 1-6 and props up, and the both sides total oxygen burns rifle (10) Heterogeneous Permutation.
10. silicate glass containing boron and aluminium without alkali melting furnaces as claimed in claim 9 is characterized in that: gable wall or arch top in territory, charging opening lateral areas (7) are provided with 1-2 flue (11).
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|---|---|---|---|
| CN201210360158.0A CN102910799B (en) | 2012-09-25 | 2012-09-25 | Heating electrode and there are the silicate glass containing boron and aluminium without alkali melting furnaces of this heating electrode |
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|---|---|---|---|
| CN201210360158.0A CN102910799B (en) | 2012-09-25 | 2012-09-25 | Heating electrode and there are the silicate glass containing boron and aluminium without alkali melting furnaces of this heating electrode |
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| CN102910799A true CN102910799A (en) | 2013-02-06 |
| CN102910799B CN102910799B (en) | 2016-01-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111928658A (en) * | 2020-08-14 | 2020-11-13 | 蚌埠中光电科技有限公司 | High-temperature furnace for simulating electrode erosion experiment |
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| CN111928658A (en) * | 2020-08-14 | 2020-11-13 | 蚌埠中光电科技有限公司 | High-temperature furnace for simulating electrode erosion experiment |
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