CN113880399A - High-electric-load kiln structure-based molten glass homogenizing circulation method and device - Google Patents
High-electric-load kiln structure-based molten glass homogenizing circulation method and device Download PDFInfo
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- 239000006060 molten glass Substances 0.000 title claims abstract description 114
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000002844 melting Methods 0.000 claims abstract description 168
- 230000008018 melting Effects 0.000 claims abstract description 168
- 239000011521 glass Substances 0.000 claims abstract description 79
- 238000007599 discharging Methods 0.000 claims abstract description 32
- 239000006066 glass batch Substances 0.000 claims abstract description 28
- 210000000481 breast Anatomy 0.000 claims abstract description 11
- 230000005684 electric field Effects 0.000 claims abstract description 7
- 238000003723 Smelting Methods 0.000 claims description 20
- 239000000156 glass melt Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 abstract description 56
- 230000000694 effects Effects 0.000 abstract description 21
- 239000000758 substrate Substances 0.000 abstract description 8
- 239000007789 gas Substances 0.000 description 29
- 238000000265 homogenisation Methods 0.000 description 20
- 239000000463 material Substances 0.000 description 14
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 7
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 5
- 229910052863 mullite Inorganic materials 0.000 description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 239000003345 natural gas Substances 0.000 description 4
- 238000005352 clarification Methods 0.000 description 3
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- 229910052697 platinum Inorganic materials 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 2
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- 239000004973 liquid crystal related substance Substances 0.000 description 2
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- 229910052760 oxygen Inorganic materials 0.000 description 2
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- 239000011819 refractory material Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 2
- 229910001887 tin oxide Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 229910001413 alkali metal ion Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 239000010439 graphite Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- 239000003607 modifier Substances 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/18—Stirring devices; Homogenisation
- C03B5/183—Stirring devices; Homogenisation using thermal means, e.g. for creating convection currents
- C03B5/185—Electric means
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B3/00—Charging the melting furnaces
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/02—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating
- C03B5/027—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating
- C03B5/03—Tank furnaces
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/02—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating
- C03B5/033—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating by using resistance heaters above or in the glass bath, i.e. by indirect resistance heating
- C03B5/0332—Tank furnaces
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
- C03B5/235—Heating the glass
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Glass Melting And Manufacturing (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
The invention provides a high-electric load kiln structure-based glass liquid homogenizing circulation method and device, which can be used for increasing the uniformity of glass, improving the homogenizing effect and improving the quality of a glass substrate by controlling the flow field influence factors in a kiln. The method comprises the following steps: putting the glass batch into the surface of molten glass in a melting tank according to a set feeding speed; electric melting electrode control electric fields are arranged at two sides of the melting tank respectively corresponding to the pre-melting zone, the hot spot zone and the discharging zone to heat and heat the molten glass to provide energy, a gas burning gun at a breast wall at the side part of the melting tank controls the thermal field to heat and heat the molten glass to provide energy, and the molten glass in the melting tank generates circulation; and the voltage value of the electric melting electrode in the pre-melting zone is smaller than that of the electric melting electrode in the hot spot zone.
Description
Technical Field
The invention relates to the technical field, in particular to a high-electric-load kiln structure-based molten glass homogenizing circulation device and method.
Background
Glass substrates are important components of liquid crystal display panels, glass quality plays a critical role in display quality, glass composition and manufacturing process are critical factors in determining surface quality, low density, high stability, and other desired attributes, and even small changes in elements or melting conditions can cause significant changes in the atomic state and structure of glass. This also puts high demands on the manufacture of the glass. At room temperature, glass is an electrical insulator with a conductivity of about 10-13-10-15Ω-1cm-1Dielectric strength of about 3x103-3x105In the meantime. However, when the glass is heated, its electrical conductivity increases significantly with increasing temperature. The conductivity of the glass melt at high temperatures is ion-conductive, the weakest binding capacity in the glass network structure is the alkali metal ion network modifier, which is the carrier of the electric current, and the conductivity of the glass in the molten state is about 0.1-1.0 omega-1cm-1And becomes a conductor completely, and although the electric conductivity is many times smaller than that of metal at this time, it is sufficient to serve as a heat generating body of joule effect. That is, the resistivity decreases with increasing temperature, and the trend of the change becomes gradually gentle with increasing temperature. Therefore, in order to conduct electricity, the external voltage must reach the critical voltage of the glass conduction, so that high electrical load must be applied to make the glass become an excellent electrical conductor under the condition, and the glass kiln is the most important thermal equipment in the glass production process.
After the batch is fed into a kiln, melting is started in a high-temperature environment of the kiln, the melting temperature of liquid crystal glass in the kiln generally reaches more than 1600 ℃, an electric boosting heating mode is usually adopted, 75% of energy is derived from electric energy, 25% of electric energy is derived from natural gas combustion, and the batch is melted into uniform and consistent glass liquid with quality meeting requirements through a series of complicated changes of physics, chemistry, heat transfer, mass transfer and the like so as to be formed. Glass melting is a very complex process involving a series of physical, chemical and physicochemical phenomena and reactions. The structural form, the geometric dimension and the process setting of the kiln can influence the melting quality of the glass to a certain extent, and due to the structural characteristics and the particularity of process parameters of the kiln, the difference between a thermal field and an electric field formed in each area inside the kiln is large, so that the uniformity of glass liquid inside the kiln is greatly influenced; meanwhile, as the temperature rises, the glass batch materials are gradually melted, the glass batch materials can form a temporary layer for melting glass between molten glass and new batch materials, the layer contains a large amount of bubbles and glass batch particles, the bubbles and the glass batch particles are attached above the molten glass, and the glass quality is greatly influenced when the glass batch materials flow into a forming device; good chemical and thermal homogeneity in the glass melt is a critical part of forming good quality glass.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a high-electric load kiln structure-based molten glass homogenizing circulation method and device, which can increase the uniformity of glass, improve the homogenizing effect and improve the quality of a glass substrate by controlling the influence factors of a flow field inside a kiln.
In order to achieve the purpose, the invention provides the following technical scheme:
a glass melt homogenizing circulation method based on a high-electric load kiln structure comprises the following steps:
putting the glass batch into the surface of molten glass in a melting tank according to a set feeding speed;
electric melting electrode control electric fields are arranged at two sides of the melting tank respectively corresponding to the pre-melting zone, the hot spot zone and the discharging zone to heat and heat the molten glass to provide energy, a gas burning gun at a breast wall at the side part of the melting tank controls the thermal field to heat and heat the molten glass to provide energy, and the molten glass in the melting tank generates circulation;
and the voltage value of the electric melting electrode in the pre-melting zone is smaller than that of the electric melting electrode in the hot spot zone.
Preferably, the voltage value relations of the electrofusion electrode in three areas are U1< U3< U2; wherein, U1 is the electric smelting electrode voltage value of premelting district, U2 is the electric smelting electrode voltage value of hot spot district, and U3 is the electric smelting electrode voltage value of ejection of compact district.
Preferably, the voltage value U1 of the pre-melting region electrofusion electrode is 600-900v, the voltage value U2 of the hot spot region electrofusion electrode is 800-1100v, and the voltage value U3 of the discharge region electrofusion electrode is 700-1000 v.
Preferably, the feeding rate is set by the formula:
M2＝M1*80％；
wherein M1 is the feed rate; m2 is the molten glass drawing amount.
Preferably, the temperature relationship of central points of the molten glass in the pre-melting zone, the hot spot zone and the discharging zone is that A is more than B and less than C, a local temperature difference is generated, and the molten glass at a low temperature flows to the molten glass at a high temperature to form a homogenizing circulation;
wherein A is the temperature of the central point of the molten glass in the premelting area, B is the temperature of the central point of the molten glass in the hot spot area, and C is the temperature of the central point of the molten glass in the discharging area.
Preferably, the temperature of the bottom of the molten glass in the pre-melting zone, the hot spot zone and the discharging zone is higher than the surface temperature, the surface of the molten glass is controlled to flow to the bottom of the molten glass to form a circulation, and the circulation drives the melting of the glass frit and the homogenization of the molten glass.
Preferably, the energy provided by the electrofusion electrode accounts for 60-80%; the energy provided by the gas burning gun accounts for 20-40%.
A glass liquid homogenizing circulation device based on a high-electric load kiln structure comprises an electric melting electrode, feeding equipment and a gas burning gun;
the melting tank comprises a head part, a tail part corresponding to the head part and two side parts, the head part, the tail part and the two side parts surround to form the melting tank, and the upper spaces of the two side parts are provided with breast walls;
the feeding equipment is arranged at the head of the melting tank;
a gas burning gun is arranged on the breast wall of the melting tank, and a nozzle of the gas burning gun is aligned to the upper space of the melting tank;
and a plurality of pairs of electric melting electrodes are symmetrically arranged at two side parts of the melting tank, and the number of the electric melting electrodes arranged in the hot spot area is greater than that of the electric melting electrodes arranged in the pre-melting area and the discharging area.
Preferably, the tail part of the melting tank is provided with a throat, and the bottom of the throat is flush with the bottom of the melting tank.
Preferably, the industrial television is further included and is arranged on the rear wall of the tail.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a glass liquid homogenizing circulation method based on a high-electric load kiln structure, different voltages are respectively applied to three areas through an electric melting electrode, joule heat is generated after the glass liquid is electrified, the heat quantity of the area near the electric melting electrode is higher, the glass liquid in the middle of a melting tank flows to the vicinity of the electric melting electrode, circulation is generated, the voltages of the three areas have specific size relationship setting, the difference of voltage is utilized to control the glass liquid in the melting tank to flow from a low-voltage area to a high-voltage area to form homogenizing circulation, the specific feeding speed is matched to facilitate the mixing and melting of glass powder, energy is provided by a gas burning gun in the upper space to form a flame space, the temperature of the glass liquid is heated through heat radiation, the temperature of the upper glass liquid is higher, the viscosity is lower, the glass liquid at the low temperature can flow to the glass liquid at the high temperature, and the circulation from the bottom to the upper part is formed, the method provided by the invention has the advantages that the electric field and the thermal field are properly controlled, the circulation effect can be improved, the circulation is enhanced, the circulation effect and the homogenization quality of the glass liquid are further stabilized and improved, the defects of the finished glass substrate can be effectively reduced, and the production yield is greatly improved.
The invention provides a glass liquid homogenizing circulation device based on a high-electric load kiln structure, wherein the inner part of a melting tank is divided into three areas, namely a pre-melting area, a hot spot area and a discharging area in sequence, the proportional relation between the feeding rate of glass batch and the glass liquid discharging amount is controlled by feeding equipment at the head of the melting tank, the heating power is controlled by controlling the setting position of an electric melting electrode and the voltage value of the electric melting electrode in different areas, and the gas flow is controlled by matching with a gas burning gun arranged in the upper space of the melting tank, so that the glass liquid in the melting tank generates circulation homogenization, the flow of the glass liquid is controlled, the uniformity of the glass is increased, the homogenization effect is improved, and the quality of a glass substrate is improved.
Further, the glass batch homogenizing device further comprises an industrial television, wherein the industrial television is arranged on the rear wall of the tail part and used for observing the flowing direction and the homogenizing effect of the molten glass, the fusion condition of the molten glass and the glass batch can be monitored in real time, the process adjustment can be conveniently carried out in time, and the quality of the glass is improved.
Furthermore, the circulating current speed and the circulating current area can be influenced by controlling the voltage, different voltages are set on the electric melting electrodes in different areas, the voltage is set in the middle area of the melting tank, the voltage in the middle area is greater than that in the front area and the rear area, and a hot spot area is formed in the middle of the melting tank, so that the molten glass in the melting tank flows from the front part to the middle part to form circulating current and promote the homogenization of the molten glass.
Drawings
FIG. 1 is a schematic top view of a kiln according to the present invention;
FIG. 2 is a side view of the kiln of the present invention;
FIG. 3 is a side view molten glass loop diagram of the furnace of the present invention.
In the figure, 1, a melting tank; 2. electric melting electrodes; 3. feeding equipment; 4. a liquid flowing hole; 5. a gas burning gun; 6. an industrial television; 7. glass batch; 100. a pre-melting zone; 110. a hot spot region; 120. a discharge zone.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
As shown in fig. 1 and 3, a glass liquid homogenizing circulation method based on a high electric load kiln structure comprises the following steps:
enabling the glass batch 7 to enter the surface of molten glass in the melting tank 1 through the feeding equipment 3 according to the set feeding speed;
heating the molten glass in the melting tank 1 by using an electric melting electrode 2 to provide energy, wherein voltage set values of the electric melting electrodes in the pre-melting zone 100, the hot spot zone 110 and the discharging zone 120 are different to generate voltage difference, wherein the voltage value of the electric melting electrode in the pre-melting zone 100 is smaller than that of the electric melting electrode in the hot spot zone 110, and the pre-melting zone generates a circulation current as shown in figure 1 due to the influence of local voltage difference and feeding factors, the circulation current in the pre-melting zone can effectively drive the melting of the glass frit and the homogenization of the molten glass, and when the molten glass reaches a certain homogenization quality, the molten glass flows to the hot spot zone to be clarified;
the gas burning gun 5 in the upper space of the melting tank 1 conveys fuel and heats the molten glass to provide energy, the upper space forms a flame space, the temperature of the bottom of the molten glass is higher than the surface temperature of the molten glass by controlling the gas flow for heating the electric melting electrode 2 and the gas burning gun 5, and the molten glass at a low temperature flows to the molten glass at a high temperature, so that a homogenizing circulation is formed.
The invention provides a high-electric load kiln structure-based molten glass homogenizing circulation method, wherein different voltages are respectively applied to three areas through an electric melting electrode 2, joule heat is generated after the molten glass is electrified, the heat quantity of the areas near the electric melting electrode 2 is higher, the molten glass in the middle of a melting tank 1 can flow to the vicinity of the electric melting electrode 2, circulation is generated, the voltages of the three areas have specific size relationship setting, the molten glass in the melting tank 1 is controlled to flow from a low-voltage area to a high-voltage area through voltage difference to form homogenizing circulation, the mixing and melting of glass powder are facilitated by matching with a specific feeding speed, a gas burning gun 5 provides energy to form a flame space in an upper space, the temperature of the molten glass is heated through heat radiation, so that the temperature of the molten glass at the upper part is higher, the viscosity is lower, and the molten glass at the low temperature can flow to the molten glass at the high temperature, the method provided by the invention has the advantages that the electric field and the thermal field are properly controlled, the circulation effect can be improved, the circulation is enhanced, the circulation effect and the homogenization quality of the glass liquid are further stabilized and improved, the defects of the finished glass substrate can be effectively reduced, and the production yield is greatly improved.
In this embodiment, the relationship of voltage values of the electrofusion electrode 2 in different regions is U1< U3< U2; wherein U1 is the voltage value of the premelting area, U2 is the voltage value of the hot spot area, and U3 is the voltage value of the discharging area.
The circulating current speed and the circulating current area can be influenced by controlling the voltage, different voltages are set on the electric melting electrodes 2 in different areas, the voltage U2 is set in the middle area of the melting tank 1, the voltage of the middle area is greater than that of the front area and that of the rear area, and a hot spot area 110 is formed in the middle of the melting tank 1, so that the molten glass in the melting tank 1 flows from the front to the middle to form circulating current, and the molten glass is homogenized.
In this embodiment, the voltage U1 of the pre-melting region for the electric melting electrode is 600-.
In this example, the relationship between the charging rate M1(kg/h) and the molten glass draw-out amount M2(kg/h) of the charging device 3 is: m2 ═ M1 × 80%.
In the embodiment, the energy provided by the electric smelting electrode 2 accounts for 60-80%; the energy provided by the gas-fired gun 5 accounts for 20-40%.
In this embodiment, the relationship of the central point temperature of the molten glass in the premelting zone 100, the hot spot zone 110 and the discharging zone 120 is A < B < C; wherein A is the temperature of the central point of the molten glass in the premelting area, B is the temperature of the central point of the molten glass in the hot spot area, and C is the temperature of the central point of the molten glass in the discharging area.
In the invention, the central temperature of the molten glass in the hot spot region is higher than that in the pre-melting region, so that the molten glass in the pre-melting region can flow in, a strong circulation is formed, and the homogenization effect of the molten glass is further improved. The glass liquid flows into the material flowing area through the hot spot area in a circulating manner, and the material flowing area can form a strong liquid circulating effect due to the liquid flowing hole and the high central temperature of the glass liquid, so that the glass liquid is clarified and homogenized again, and the quality of the glass liquid is improved.
In this embodiment, the bottom temperature of the molten glass in the premelting zone 100, the hot spot zone 110 and the discharge zone 120 is higher than the surface temperature.
Based on the simulation results of the thermal field and the flow field of the kiln and the field experience, the invention finds that the circulation of the molten glass in the kiln can be controlled by controlling the feeding speed, the discharge amount of the molten glass, the electrode voltage, the gas quantity and other parameters, so that the homogenization effect of the molten glass is improved, and the yield of the glass substrate can be improved. And through careful analysis and exploration of simulation results, the electric field and the thermal field in the glass kiln are properly controlled, the circulation effect can be improved, the circulation is enhanced, and the homogenization quality of the molten glass is further stabilized.
As shown in fig. 1 and 2, a molten glass homogenizing circulation device based on a high-electric load kiln structure comprises an electric melting electrode 2, a feeding device 3 and a gas burning gun 5; the melting tank 1 comprises a head part, a tail part corresponding to the head part and two side parts, the head part, the tail part and the two side parts jointly enclose the melting tank 1, and the upper spaces of the two side parts are provided with breast walls; the interior of the melting tank 1 is sequentially provided with a premelting area 100, a hot spot area 110 and a discharging area 120 from the head to the tail, and molten glass flows from the premelting area 100 to the hot spot area 110 to form a circular flow; the feeding equipment 3 is arranged at the head part of the melting tank 1; gas-burning guns 5 are arranged on two side parts of the upper space of the melting tank 1; a plurality of pairs of electric smelting electrodes 2 are symmetrically arranged on two sides of the lower space of the melting tank 1, wherein the number of the electric smelting electrodes 2 in the hot spot region 110 is greater than that of the electric smelting electrodes 2 in the pre-melting region 100 and the discharging region 120.
The invention provides a glass melt homogenizing circulation device based on a high-electric load kiln structure, which is characterized in that the interior of a melting tank 1 is divided into three areas, namely a pre-melting area 100, a hot spot area 110 and a discharging area 120 in sequence, the proportional relation between the feeding rate of glass batch 7 and the glass melt discharging amount is controlled through feeding equipment 3 at the head of the melting tank 1, the heating power is set and controlled through controlling the setting position of an electric melting electrode 2 and the voltage value of the electric melting electrode 2 in different areas, and the gas amount is controlled through matching with a gas burning gun 5 arranged in the upper space of the melting tank 1, so that the glass melt in the melting tank 1 generates homogenizing circulation, the flow of the glass melt is controlled, the uniformity of the glass is increased, the homogenizing effect is improved, and the quality of a glass substrate is improved.
In this embodiment, the gas burning guns 5 are staggered with the electric melting electrodes 2.
In this embodiment, the melting tank 1 is a rectangular parallelepiped and is made by stacking block-shaped refractory materials, and the material includes one or more of dense zirconium, alumina, and mullite.
In this embodiment, the electrofusion electrode 2 is formed by stacking a plurality of small electrode blocks, and the tail part is provided with an electric connection binding post.
In this embodiment, the material of the electrofusion electrode 2 is one or more of tin oxide, platinum and graphite.
In this embodiment, the number of the electrofusion electrodes 2 is 4-12 pairs, and the electrodes are symmetrically distributed on the side of the melting tank 1.
In the embodiment, the gas combustion gun 5 is wrapped and fixed by refractory materials, and the nozzle of the gas combustion gun 5 is aligned to the upper part inside the melting tank 1; the fuel of the gas-burning gun 5 adopts one or more of methane, natural gas and liquefied petroleum gas.
In this embodiment, the tail of the melting tank 1 is provided with a throat 4, and the bottom of the throat 4 is flush with the bottom of the melting tank 1.
In the embodiment, the glass batch homogenizing device further comprises an industrial television 6 which is arranged on the rear wall of the tail part and used for observing the flowing direction and the homogenizing effect of the molten glass, the fusion condition of the molten glass and the glass batch can be monitored in real time, the process adjustment can be conveniently carried out in time, and the quality of the glass is improved.
The circulation method and apparatus of the present invention will be further explained with reference to specific embodiments.
Example 1
In the actual production process, the feeding rate is controlled at 900KG/h, and the drawing amount of the molten glass is controlled at 800 KG/h; voltages of a pre-melting area 100, a hot spot area 110 and a liquid flowing area of the melting tank 1 are respectively set to be 900v, 1000v and 800 v; the gas amount was set to 80m 3/h. The setting of the conditions is favorable for forming circulation of the molten glass in the kiln, and the central temperature of the hot spot area is higher than the central temperature of the discharging area and higher than the central temperature of the pre-melting area through the control of voltage and gas quantity; the pre-melting zone 100 is influenced by local temperature difference and feeding factors, and then generates a circulation flow, as shown in fig. 1, which is beneficial to driving the glass batch 7 into the glass liquid, so as to promote melting of the glass batch 7; as shown in fig. 3, the bottom temperature of the molten glass is higher than the surface temperature of the molten glass due to the heating of the bottom electrode and the combustion cooperation of the upper combustion gun, so that the surface of the molten glass is controlled to flow to the bottom circulation of the molten glass. The circulation of the pre-melting zone 100 can effectively drive the melting of the glass batch 7 and the homogenization of the glass liquid, when the glass liquid reaches a certain homogenization quality, the glass liquid flows to the hot spot zone 110 for clarification, and the central temperature of the hot spot zone 110 is higher, so that the glass batch 7 in the pre-melting zone 100 flows in, a strong circulation is formed, and the homogenization effect of the glass liquid is further improved. The molten glass flows into the discharging area 120 in a circulating manner through the hot spot area 110, the tail part of the discharging area 120 is provided with the liquid flow hole 4, and the liquid flow hole 4 at the tail part of the discharging area 120 can form a strong liquid circulating effect, so that the molten glass is clarified and homogenized again, and the quality of the molten glass is improved.
Example 2
In the actual production process, the feeding rate is controlled to be 1000KG/h, and the drawing amount of the molten glass is controlled to be 800 KG/h; voltages of a pre-melting area 100, a hot spot area 110 and a liquid flowing area of the melting tank 1 are respectively set to be 800v, 1100v and 900 v; the gas amount was set to 90m 3/h. The setting of the conditions is favorable for forming circulation of the molten glass in the kiln, and the central temperature of the hot spot area is higher than the central temperature of the discharging area and higher than the central temperature of the pre-melting area through the control of voltage and gas quantity; the pre-melting zone 100 is influenced by local temperature difference and feeding factors, so that circulation flow can be generated, and the circulation flow is favorable for driving the glass batch 7 to enter the glass liquid, so that the melting of the glass batch 7 is promoted; meanwhile, the heating of the bottom electrode is matched with the combustion of the upper burning gun, so that the temperature of the bottom of the molten glass is higher than the temperature of the surface of the molten glass, and the surface of the molten glass is controlled to flow to the bottom circulation of the molten glass. The circulation of the pre-melting zone 100 can effectively drive the melting of the glass batch 7 and the homogenization of the glass liquid, when the glass liquid reaches a certain homogenization quality, the glass liquid flows to the hot spot zone 110 for clarification, and the central temperature of the hot spot zone 110 is higher, so that the glass batch 7 in the pre-melting zone 100 flows in, a strong circulation is formed, and the homogenization effect of the glass liquid is further improved. The molten glass flows into the discharging area 120 in a circulating manner through the hot spot area 110, the tail part of the discharging area 120 is provided with the liquid flow hole 4, and the liquid flow hole 4 at the tail part of the discharging area 120 can form a strong liquid circulating effect, so that the molten glass is clarified and homogenized again, and the quality of the molten glass is improved.
Example 3
In the actual production process, the feeding rate is controlled to be 1000KG/h, and the drawing amount of the molten glass is controlled to be 800 KG/h; voltages of a pre-melting area 100, a hot spot area 110 and a liquid flowing area of the melting tank 1 are respectively set to be 600v, 800v and 700 v; the gas amount was set to 80m 3/h. The setting of the conditions is favorable for forming circulation of the molten glass in the kiln, and the central temperature of the hot spot area is higher than the central temperature of the discharging area and higher than the central temperature of the pre-melting area through the control of voltage and gas quantity; the pre-melting zone 100 is influenced by local temperature difference and feeding factors, so that circulation flow can be generated, and the circulation flow is favorable for driving the glass batch 7 to enter the glass liquid, so that the melting of the glass batch 7 is promoted; meanwhile, the heating of the bottom electrode is matched with the combustion of the upper burning gun, so that the temperature of the bottom of the molten glass is higher than the temperature of the surface of the molten glass, and the surface of the molten glass is controlled to flow to the bottom circulation of the molten glass. The circulation of the pre-melting zone 100 can effectively drive the melting of the glass batch 7 and the homogenization of the glass liquid, when the glass liquid reaches a certain homogenization quality, the glass liquid flows to the hot spot zone 110 for clarification, and the central temperature of the hot spot zone 110 is higher, so that the glass batch 7 in the pre-melting zone 100 flows in, a strong circulation is formed, and the homogenization effect of the glass liquid is further improved. The molten glass flows into the discharging area 120 in a circulating manner through the hot spot area 110, the tail part of the discharging area 120 is provided with the liquid flow hole 4, and the liquid flow hole 4 at the tail part of the discharging area 120 can form a strong liquid circulating effect, so that the molten glass is clarified and homogenized again, and the quality of the molten glass is improved.
Claims (10)
1. A high-electric load kiln structure-based molten glass homogenizing circulation method is characterized by comprising the following steps:
putting the glass batch into the surface of molten glass in the melting tank (1) according to a set feeding speed;
electric fields are controlled by electric melting electrodes (2) arranged on two sides of the melting tank (1) and respectively corresponding to the pre-melting zone (100), the hot spot zone (110) and the discharging zone (120) to heat and heat molten glass to provide energy, a gas burning gun (5) on a breast wall on the side of the melting tank (1) controls the thermal fields to heat and heat the molten glass to provide energy, and the molten glass in the melting tank (1) generates circulation;
wherein the voltage value of the electrofusion electrode of the pre-melting zone (100) is smaller than the voltage value of the electrofusion electrode of the hot spot zone (110).
2. The high electric load furnace structure-based molten glass homogenizing circulation method according to claim 1, characterized in that the voltage value relationship of the electrofusion electrode (2) in three regions is U1< U3< U2; wherein, U1 is the electric smelting electrode voltage value of premelting district, U2 is the electric smelting electrode voltage value of hot spot district, and U3 is the electric smelting electrode voltage value of ejection of compact district.
3. The method for homogenizing and circulating molten glass based on the high-electric-load furnace structure as claimed in claim 2, wherein the voltage value of the pre-melting region electric melting electrode U1 is 600-900v, the voltage value of the hot spot region electric melting electrode U2 is 800-1100v, and the voltage value of the discharge region electric melting electrode U3 is 700-1000 v.
4. The method for circulating and homogenizing molten glass based on the high-electric-load kiln structure as claimed in claim 1, wherein the feeding rate is set according to the following formula:
M2＝M1*80％；
wherein M1 is the feed rate; m2 is the molten glass drawing amount.
5. The method for homogenizing circulation of molten glass based on the high-electric-load kiln structure is characterized in that the temperature relationship among central points of molten glass in the premelting area (100), the hot spot area (110) and the discharging area (120) is A < B < C, so that local temperature difference is generated, and the molten glass at a low temperature flows to the molten glass at a high temperature to form homogenizing circulation;
wherein A is the temperature of the central point of the molten glass in the premelting area, B is the temperature of the central point of the molten glass in the hot spot area, and C is the temperature of the central point of the molten glass in the discharging area.
6. The circulating flow method for homogenizing glass melt based on the high-electric-load kiln structure is characterized in that the temperatures of the bottoms of the glass melt in the pre-melting zone (100), the hot spot zone (110) and the discharging zone (120) are all higher than the surface temperature, the surface of the glass melt is controlled to flow to the bottom of the glass melt to form a circulating flow, and the circulating flow drives the melting of glass frits and the homogenizing of the glass melt.
7. The high-electric-load kiln structure-based molten glass homogenizing circulation method according to claim 1, characterized in that the electric melting electrode (2) provides energy in a ratio of 60-80%; the energy provided by the gas-fired gun (5) accounts for 20-40%.
8. A circulating device for homogenizing molten glass based on a high-electric-load kiln structure, which is characterized in that the circulating device is based on the circulating method of any one of claims 1 to 7 and comprises an electric smelting electrode (2), a feeding device (3) and a gas burning gun (5);
the melting tank (1) comprises a head part, a tail part corresponding to the head part and two side parts, the head part, the tail part and the two side parts surround to form the melting tank (1), and the upper spaces of the two side parts are provided with breast walls;
the feeding equipment (3) is arranged at the head part of the melting tank (1);
a gas burning gun (5) is arranged on the breast wall of the melting tank (1), and a nozzle of the gas burning gun (5) is aligned to the upper space of the melting tank (1);
the two sides of the melting tank (1) are symmetrically provided with a plurality of pairs of electric melting electrodes (2), and the number of the electric melting electrodes (2) arranged in the hot spot region (110) is larger than the number of the electric melting electrodes (2) arranged in the pre-melting region (100) and the discharge region (120).
9. The high-electric-load kiln structure-based molten glass homogenizing circulation device according to claim 8, characterized in that a throat (4) is arranged at the tail of the melting tank (1), and the bottom of the throat (4) is flush with the bottom of the melting tank (1).
10. The high electrical load furnace structure-based molten glass homogenizing circulation device according to claim 8, characterized by further comprising an industrial television (6) arranged on the rear wall of the tail.
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| CN115466037A (en) * | 2022-09-02 | 2022-12-13 | 湖南旗滨微晶新材料有限公司 | Special glass preparation system and preparation method of special glass |
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