CN111170618B - Molten glass steady flow control mechanism suitable for tin bath inlet of special glass float process - Google Patents
Molten glass steady flow control mechanism suitable for tin bath inlet of special glass float process Download PDFInfo
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- CN111170618B CN111170618B CN201911180312.4A CN201911180312A CN111170618B CN 111170618 B CN111170618 B CN 111170618B CN 201911180312 A CN201911180312 A CN 201911180312A CN 111170618 B CN111170618 B CN 111170618B
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- 239000011521 glass Substances 0.000 title claims abstract description 152
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 238000006124 Pilkington process Methods 0.000 title claims abstract description 23
- 239000006060 molten glass Substances 0.000 title claims abstract description 19
- 230000007246 mechanism Effects 0.000 title claims abstract description 17
- 239000011449 brick Substances 0.000 claims abstract description 182
- 239000007788 liquid Substances 0.000 claims abstract description 86
- 238000004519 manufacturing process Methods 0.000 claims abstract description 29
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 28
- 238000005485 electric heating Methods 0.000 claims abstract description 19
- 238000002844 melting Methods 0.000 claims abstract description 15
- 230000008018 melting Effects 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims abstract description 11
- 239000005329 float glass Substances 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- 230000007547 defect Effects 0.000 description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 8
- 239000005388 borosilicate glass Substances 0.000 description 7
- 238000013461 design Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 238000005498 polishing Methods 0.000 description 5
- 238000010992 reflux Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 description 3
- 238000007667 floating Methods 0.000 description 3
- 238000012827 research and development Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000012769 display material Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
- C03B18/18—Controlling or regulating the temperature of the float bath; Composition or purification of the float bath
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B18/00—Shaping glass in contact with the surface of a liquid
- C03B18/02—Forming sheets
- C03B18/16—Construction of the float tank; Use of material for the float tank; Coating or protection of the tank wall
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Furnace Charging Or Discharging (AREA)
Abstract
The invention belongs to the technical field of special glass float process production, and provides a molten glass steady flow control mechanism suitable for a tin bath inlet of a special glass float process. The proposed molten glass steady flow control mechanism suitable for the tin bath inlet of the special glass float process is provided with a flashboard arranged in a runner at the tail end of a melting furnace; the rear end of the melting furnace tail end runner is provided with a lip brick; the lip brick is positioned above the tin bath inlet and forms a combined liquid flow channel A with the side wall brick I; the rear end of the side wall brick I is provided with a side wall brick II which is attached to the side wall brick I; two sides of the tin bath inlet are provided with two-section type flow-limiting bricks connected with cambered surfaces; the rear end of the side wall brick II is provided with a lintel brick; a combined liquid flow channel B with an opening at the upper end is formed among the two side flow limiting bricks, the side wall bricks II and the lintel bricks; a cover plate brick is arranged above the combined liquid flow channel B; and a 0-shell sealing space is formed between the cover plate brick and the side wall brick II as well as between the cover plate brick and the lintel brick, and an electric heating silicon carbide rod is arranged in the 0-shell sealing space. The invention improves the quality and the yield of the special glass.
Description
Technical Field
The invention belongs to the technical field of special glass float process production, and mainly relates to a molten glass steady flow control mechanism suitable for a tin bath inlet of a special glass float process.
Background
The special glass produced by using a small float process in the field of glass research and development at present mainly comprises high-alumina silica glass, high-borosilicate glass and the like.
The high-alumina silica glass is used as a novel display material, is mainly used in the field of touch screens of smart phones, tablet computers, touch control integrated machines and the like, is used as a touch screen product in China for large consumers, and most of glass products in the past depend on import.
The high borosilicate glass has good optical and electrical properties and very low thermal expansion coefficient, and can work for a long period at a high temperature of 450 ℃. With the advent of float plate high borosilicate glass, the application fields of high borosilicate glass are further expanded, such as novel high-grade technological and safety fields of LCD projector protection cover plates, heat-resistant glass panels of outdoor large lamps, heat-resistant glass table tops, high-grade bulletproof glass, high-grade fireproof glass and the like.
Compared with common float glass, special glass such as high-alumina silicate glass, high-borosilicate glass and the like has the most outstanding characteristics of high melting temperature, high viscosity and high refractory property, and the production technology belongs to the front technology in the high-tip field, the foreign technology is strictly kept secret, the domestic research is started later, and the successful technology reference is lacking. In order to ensure the glass quality, the tonnage of the production line should not be too great. The tonnage of the float line of the high-quality special glass produced at home and abroad is generally 30-100 t/d.
The production place of Luoyang float glass, which is one of three large float glass processes in the world, in China is nearly 400 large and medium-sized float glass lines mainly used for producing building glass and automobile glass with general AL 2O3 being about 1.2%, and the production technology of the conventional soda-lime-silica float glass with the thickness of 3-15mm is skillful. If the float process technology is successfully expanded to the technical field of high-alumina-silica and high-borosilicate glass production, wherein the AL 2O3 reaches 4-20%, the melting temperature is higher, the glass forming viscosity is higher, the production variety and thickness span are larger by 0.3-8mm, and the forming control difficulty is higher, the technology upgrading of float glass in China can be greatly influenced.
At present, domestic very powerful float glass companies, scientific research institutions and the like are actively developing and constructing small float lines to produce special float glass. As the production line generally has the characteristics of small tonnage of 30-50t/d, large adjustable output range of 50%, large span of production variety and thickness change of 0.3-8mm, high production control difficulty and the like, the perfect and successful production technical experience and reasonable and fine process design are still gradually searched and searched. As the Al 2O3 content in the glass is higher, the glass is melted and the forming viscosity is higher, besides the defects that the temperature control of a melting furnace clarifying channel is unbalanced, clarification is insufficient and residual microbubbles are highlighted can be expected, and the forming defects of high glass surface waviness, high surface micro-corrugation, difficult glass flattening and polishing, large plate optical deformation, and drifting of fixed wet back ribs at two side parts of the glass towards the inside of an effective glass plate, and the like, which are caused by uneven temperature-viscosity due to imperfect configuration of a forming tin bath inlet flow channel, are more prominent, so that the production quality and the yield of special high-alumina silicon and high-borosilicate glass are seriously influenced, and the bottleneck for limiting the production technology of special float glass to obtain great breakthrough are formed.
The reasonable and fine design configuration and the thermal state fine maintenance exploration of the key part structure at the joint of the channel outlet and the inlet of the forming tin bath of the special glass small float glass kiln become the primary tasks which are needed to be solved by design research and development teams and production operators in the field at present.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a molten glass steady flow control mechanism suitable for a tin bath inlet of a special glass float process.
The invention adopts the technological analysis of the production flow form of the lip brick part at the key part of the joint of the passage outlet of the high-alumina silicon float glass kiln and the inlet of the forming tin bath as an entry point, and aims at the protruding forming defects of large glass surface waviness, prominent surface micro-wrinkles, fixed wet back line of the glass edge part, internal drifting of effective glass, small open bubbles or closed bubbles generated on the lower surface of the glass, difficult flattening and polishing of the glass, large optical deformation of the plate surface and the like caused by high content of glass AL 2O3, and adopts the research and development thought of combining theory and practice to gradually optimize the structural design and technological configuration of the lip brick part, thereby effectively controlling and relieving the forming defects and improving the quality and the yield of the glass.
The invention adopts the following technical scheme for accomplishing the purposes:
The molten glass steady flow control mechanism is suitable for the molten tin bath inlet of the special glass float process and is provided with a flashboard arranged in a runner at the tail end of a melting furnace; the flashboard is perpendicular to the flowing direction of the molten glass, and a gap for flowing the molten glass is formed between the lower end face of the flashboard and the bottom face of the flow passage at the tail end of the melting furnace; the rear end of the melting furnace tail end runner is provided with a lip brick; the lip brick outlet nose end is arranged in an inclined cambered surface, and is positioned above the tin bath inlet and forms a combined liquid flow channel A with the side wall brick I; the rear end of the side wall brick I is provided with a side wall brick II which is jointed with the side wall brick I; flow limiting bricks are arranged on two sides of the tin bath inlet; the flow limiting bricks are obliquely arranged from the lip bricks backwards and outwards; the front ends of the current limiting bricks at both sides are respectively attached to wet back bricks which are arranged in a tin bath below the lip bricks and are close to the front end wall of the tin bath, and the current limiting bricks are of novel movable two-section cambered surface connection combined structures; glass liquid flowing back from the wet back area in the channel between the flow limiting bricks on two sides and the inner side surfaces of the two side walls of the lip brick forms glass edges; the rear end of the side wall brick II is provided with a lintel brick which is parallel to the flashboard; the lintel brick is positioned above the tin bath, and a channel for flowing glass liquid is arranged between the lintel brick and the bottom surface of the tin bath; a combined liquid flow channel B with an opening at the upper end is formed among the flow limiting bricks, the side wall bricks II and the lintel bricks at the two sides; a cover plate brick is arranged above the combined liquid flow channel B; a 0-shell sealing space is formed among the cover plate bricks, the side wall bricks II and the lintel bricks, N 2 gas is introduced into the space during the production of conventional float glass, and the pollution of tin liquid after the outside air enters the tin bath space is effectively prevented through the gas sealing effect; when special glass is produced, an electric heating silicon carbide rod is arranged in the sealing space; the electric heating silicon carbide rods are arranged in a staggered manner from top to bottom, and are obliquely arranged from top to bottom; an electric heating silicon carbide rod is arranged between the lip brick and the wet back brick; and the cooling speed is slowed down by adopting a supplementary heating mode of an electric heating silicon carbide rod.
In a molten glass steady flow control mechanism of a tin bath inlet of a special glass float process, the control of the depth H 1 of a front runner of a flashboard needs to satisfy the formula 1:
In the formula 1, G is the flow rate t/d of glass liquid, ρ is the density G/cm3 of the glass liquid, W * is the width mm of the lip brick, and V is Flow of is the flow rate mm/s of the glass liquid at the outlet of the flow channel; the stability of the production liquid flow control is considered, the selection range of the width W of the flow channel outlet is 400-650 mm, and the flow velocity V Flow of of the glass liquid at the flow channel outlet is 3-6 mm/s.
In the glass liquid steady flow control mechanism of the tin bath inlet of the special glass float process, the distance H 2 of the lip brick from the tin liquid surface is required to meet the requirement of H 2 = 60-65 mm.
The distance between the lip brick and the wet back brick, namely the length L of the backflow area, is 100-140 mm.
The distance between the lip brick and the flow limiting brick is the reverse distance b=55 to 65mm.
The diameter of a single electric heating silicon carbide rod is 50-80 mm; the number of the electrically heated silicon carbide rods in the combined liquid flow channel B is 3-5 in balance according to the change trend of the viscosity of glass along with the temperature and the size of the cross section of 0 Bei Ceqiang, and the total power is 60-80 kw.
The invention provides a molten glass steady flow control mechanism suitable for a tin bath inlet of a special glass small float process, which combines production practice from mass conservation and flow morphology rules of fluid mechanics, and provides structural design and process configuration of a special runner lip brick position suitable for a special glass small float line, so that the molten glass flow morphology of the lip brick position of the special glass high viscosity, large span variety range and small float line is in a controllable and adjustable steady flow state: the method comprises the following steps:
1. And by adding the correction coefficient, the flow channels of H 1 and W and the lip brick channels are reasonably arranged, so that when the glass liquid from the melting furnace passes through the flow regulating flashboard, the kinetic energy requirement of the small-flow glass liquid can be met under the state of enough pressure difference.
2. The positioning structure of the H 2, the L and the B lip bricks is reasonably arranged, and a 0 Bei Kongjian silicon carbon rod with certain power is specially added for special glass in a 0-shell sealing space formed by a cover plate brick, a side wall brick II and a tin lintel brick, so that the temperature difference between the inner layer and the outer layer of glass liquid is slowed down, and the flattening and polishing quality of the surface of the glass liquid is improved; the electric heating of a silicon carbide rod in a wet back area is increased to strengthen the reflux quantity of float glass liquid in the upper space of a wet back brick at the lower part of the lip brick, so that when the glass liquid flows through a combined liquid flow channel formed by the lip brick and a side wall brick I thereof, a small quantity of glass liquid which is contacted with the lip brick is polluted by refractory materials, and when the glass liquid rich in refractory material oxides flows out of the nose end of the lip brick, the glass liquid which is separated from forward flowing flows towards the wet back brick, and a reasonably controlled wet back flow with certain kinetic energy and viscosity requirements is formed; then the wet back flow can naturally flow along the wet back bricks towards two sides, and then the wet back flow is converged with good glass liquid forward flow under the lip bricks through a reasonably arranged channel B-shaped area between the edge line of the lip bricks and the movable novel current-limiting bricks, so that the wet back line which is close to the edge of the glass ribbon as much as possible and is positioned in the cut edge removing range is formed. The movable novel flow limiting brick is a two-section cambered surface connection combined structure, and has the characteristics of being capable of flexibly adjusting the opening degree, the flow limiting length in the flowing process of glass liquid and the subsequent epitaxial flowing angle, and being convenient for hot state replacement. In this way, the polluted glass liquid contacting the launder lip brick forms glass edges due to the controllable reflux effect, so that defects are concentrated on the glass edges and removed in the glass cutting and edge removing process, and the glass quality and the assembly yield are ensured; meanwhile, the invention supplements and heats by means of the 0 Bei Oujian silicon carbide rod, slows down the temperature difference between the inner layer and the outer layer of the glass liquid, keeps the good glass liquid composition of the steady flow state of the upper layer and the middle layer in the lip brick channel, finally effectively meets the lower surface and the upper surface of the glass belt within the wide range of the plate, and improves the surface quality of the glass.
In summary, the invention makes the special glass with large surface waviness, prominent surface micro-wrinkles, inner drifting of fixed wet back line of glass edge, small open bubble or closed bubble generated on the lower surface of the glass, difficult flattening and polishing, and the prominent forming defects of large optical deformation of the plate surface, etc. effectively controlled and lightened, and the quality and the yield of the glass are improved.
Drawings
FIG. 1 is a schematic view of the lip block structure and glass flow of the special float process of the present invention.
Fig. 2 is a sectional view of the I-I of fig. 1.
In the figure: 1. flashboard, 2, lip brick, 3, sidewall brick I, 4, wet back brick, 5, current limiting brick, 6, 0 Bei Gaiban, 7, sidewall brick II, 8, lintel brick, 9, electric heating silicon carbide rod.
Detailed Description
The invention will be described with reference to the accompanying drawings and specific embodiments, wherein the front end and the rear end refer to the directions of glass liquid flow;
As shown in fig. 1 and 2, a molten glass steady flow control mechanism suitable for a tin bath inlet of a special glass float process is provided with a flashboard 1 arranged in a flow passage at the tail end of a melting furnace; the flashboard 1 is perpendicular to the flowing direction of the glass liquid, and a gap for flowing the glass liquid is formed between the lower end surface of the flashboard 1 and the bottom surface of the flow passage at the tail end of the melting furnace; the rear end of the melting furnace tail end runner is provided with a lip brick 2; the outlet nose end of the lip brick 2 is arranged in an inclined cambered surface manner, and the lip brick 2 is positioned above the inlet of the tin bath and forms a combined liquid flow channel A with the side wall brick I3; the rear end of the side wall brick I3 is provided with a side wall brick II 7 which is attached to the side wall brick I; flow limiting bricks 5 are arranged on two sides of the tin bath inlet; the flow limiting bricks 5 are obliquely arranged from the lip bricks backwards and outwards; the front ends of the current limiting bricks 5 on the two sides are respectively attached to a wet back brick 4 which is arranged in a tin bath below the lip brick and is close to the front end wall of the tin bath, and the current limiting bricks 5 are of a novel movable two-section cambered surface connection combined structure; glass liquid flowing back from the wet back area in a channel (B-shaped area) between the flow limiting bricks 5 on two sides and the inner side surfaces of two side walls of the lip brick 2 forms glass edges; the rear end of the side wall brick II 7 is provided with a lintel brick 8 which is parallel to the flashboard; the lintel brick 8 is positioned above the tin bath, and a channel for flowing glass liquid is arranged between the lintel brick and the bottom surface of the tin bath; a combined liquid flow channel B with an opening at the upper end is formed among the flow limiting bricks 5, the side wall bricks II 7 and the lintel bricks 8 at two sides; a cover plate brick 6 is arranged above the combined liquid flow channel B; a 0-shell sealing space is formed among the cover plate brick 6, the side wall brick II 7 and the lintel brick 8, N2 gas is introduced into the space during the production of conventional float glass, and the pollution of tin liquor after the outside air enters the tin bath space is effectively prevented through the gas sealing effect; in the production of special glass, an electric heating silicon carbide rod 9 is arranged in the sealed space; the electric heating silicon carbide rods 9 are arranged in a plurality of staggered layers from top to bottom, and the electric heating silicon carbide rods 9 are obliquely arranged from top to bottom; an electric heating silicon carbide rod is arranged between the lip brick 2 and the wet back brick 4; and the cooling speed is slowed down by adopting a supplementary heating mode of an electric heating silicon carbide rod.
In a molten glass steady flow control mechanism of a tin bath inlet of a special glass float process, the control of the depth H 1 of a front runner of a flashboard needs to satisfy the formula 1:
In the formula 1, G is the flow rate t/d of glass liquid, ρ is the density G/cm3 of the glass liquid, W * is the width mm of the lip brick, and V is Flow of is the flow rate mm/s of the glass liquid at the outlet of the flow channel; the stability of the production liquid flow control is considered, the width W of the outlet of the flow channel is selected to be 400-650 mm, and the flow velocity V of the glass liquid at the outlet of the flow channel is selected to be Flow of -6 mm/s.
In the glass liquid steady flow control mechanism of the tin bath inlet of the special glass float process, the distance H 2 of the lip brick from the tin liquid surface is required to meet the requirement of H 2 = 60-65 mm; the distance between the lip brick and the tin liquid level is H 2 =65-70 mm according to experience. The distance H 2 between the lip brick and the tin liquid level determines the free falling path of the glass liquid, the production capacity is large, the glass liquid flow is large, and the suspension height is correspondingly increased; the glass liquid is excessively small in suspension height, can inhibit backflow, and is spread backwards on the bottom surface of the launder to form retention, so that crystallization is easy to generate, and the glass liquid is unfavorable to flow. The glass liquid has overlarge suspension height, and the free flow of the glass is unstable, so that folds are generated, and folding bubbles appear. Aiming at the small floating normal line of special glass, the 'small flow and high viscosity' are considered, and the distance between the corresponding lip brick and the tin liquid level is H 2 x=60-65 mm.
The distance between the lip brick and the wet back brick, namely the length L of the backflow area, is 100-140 mm; typically normal to the float, the length of the return zone l=140 to 200mm. If the distance is too large, the wet back flow is increased, so that the wet back line moves inwards, the width of the edge to be cut is increased, and the yield is affected; if the distance is too small and the extending time is too short, the backflow of the glass liquid is limited, and the glass liquid with impurities is not shunted to the natural edge, so that the quality of the plate surface is affected. However, for the small floating normal of special glass, the kinetic energy of naturally spreading outwards from a falling point is insufficient when glass liquid flows down from a lip brick due to high viscosity of the glass, and the proper backflow of the glass liquid is considered due to small value of the width B of the lip brick, the length of a backflow area can be properly reduced, and the value range L is 100-140 mm according to physical simulation and practical experience; meanwhile, the electric heating supplementary heat of the silicon carbide rod is added in the wet back area, so that the reflux effect of the high-viscosity low-flow glass liquid is enhanced.
The distance between the lip brick and the flow limiting brick is the reverse distance B=55-65 mm; the general floating line is mainly produced by normal 3-12 mm glass, and the distance between the lip brick and the current-limiting brick (namely the reverse distance) B has no special requirement, but when the electronic glass production line below 3mm is produced, the importance of the distance B between the lip brick and the current-limiting brick is highlighted: too small interval can prevent the wet back from flowing forwards, and impurities and crystallization on the lower surface of the glass are easy to occur; the spacing is too large, the wet back line moves inwards, the width of the edge to be cut is increased, and the yield is affected.
For special glass small float, because of the high viscosity, the kinetic energy of the small flow of glass liquid flowing down from the lip brick is insufficient and the back flow of the glass liquid is small, the outstanding problem is that the glass liquid and the current-limiting brick are possibly separated, the distance between the two side boundaries of the lip brick and the current-limiting brick is large relatively, and the effect of the current-limiting brick is weakened, therefore, on one hand, the heating measures of the silicon carbide rod 9 can be added in the space and the wet back area at the upper part of the lip brick 2, see fig. 1 and 2, the kinetic energy of the back flow of the glass liquid and the outward spreading of the glass liquid at the falling point of the tin bath can be strengthened, on the other hand, the two-stage cambered surface connection combined novel movable current-limiting brick 5 can be adopted, the opening degree and the inclination angle of the current-limiting brick 5 can be flexibly adjusted, and the repeated practical verification is carried out for a plurality of times, and the distance between the lip brick boundary of the special glass small float and the current-limiting brick (i.e. the reverse distance) b=55-65 mm is reasonable.
The defects of large surface waviness, prominent surface micro-wrinkles, difficult flattening and polishing of the glass and large optical deformation of the plate surface are caused by small heat brought by small tonnage glass liquid, large cooling speed block of the upper surface of the glass, large temperature gradient in the thickness direction and large viscosity increase amplitude when the high-alumina glass flows through a kiln passage and a lip brick part. In this case, the normal operation of introducing N2 gas into the 0-bellow space is obviously unsuitable, but the surface cooling of the high-alumina glass is aggravated, and the surface waviness and wrinkle defect degree of the glass are enhanced. Therefore, when producing small tonnage high alumina glass, the N2 gas introduced into the zero-back space needs to be turned off, meanwhile, the heating mode of the silicon carbide rod shown in fig. 1 and 2 is adopted to slow down the cooling speed, and the hole reserved on the side wall brick II 7 of the zero-back space, which can penetrate through the silicon carbide rod 9, can be optimally in compliance with the shape that glass liquid flows into a tin bath from a lip brick, and is obliquely arranged from top to bottom. The hole can be used in the production process, and a silicon carbide rod is used for heating when glass with higher viscosity is produced, so that the surface viscosity is reduced, and the quality of the glass is improved; n2 gas can be properly introduced when the glass with low viscosity is produced, so that the pollution of the outside air to a tin bath is prevented.
Considering the factors of the consideration and considering the strength problem of a single silicon carbon rod, the diameter of the silicon carbon rod with the length of about 2000mm and the 0-shell space is increased is generally selected to be 50-80 mm; the number of the silicon carbide rods with the 0-shellfish space increased is 3-5 in balance according to the change trend amplitude of the viscosity of the glass along with the temperature and the size of the cross section of the wall brick II of 0 Bei Ce, and the total power of 60-80 kw is reasonable.
The defects of ' the fixed wet back line of the glass edge part ' and ' the small open bubbles or closed bubbles generated on the lower surface of the glass ' are all characterized in that ' the flow rate of production liquid is small, the heat quantity of the glass is small, the viscosity is large ' and the like of a special glass small tonnage production line, in contrast, the height H 2 from a lip brick to a tin liquid surface, which is set by adopting general float experience, is relatively larger, the reflow area L of a wet back brick area is relatively longer, the distance B between the lip brick edge line and a flow limiting brick is relatively larger, and thus the ' the temperature of the wet back area is lower, the phenomenon of ' the small backflow of glass liquid ' appears. It is typically on one side of the ribbon but sometimes extends to half of the lateral ribbon. On the other hand, small backflow of glass liquid can cause the inner movement of a wet back line, and the glass yield is affected.
The treatment measures of small bubbles on the lower surface of the glass are as follows: the temperature of the flow channel is increased, good sealing around the wet back area is ensured, a silicon carbide rod heater is additionally arranged in the space of the upper area of the wet back brick, back lining reflux liquid is strengthened, stagnation of glass liquid in the reflux area is weakened, and normal glass liquid flow in the wet back area is ensured.
Treatment measures for treating the damp back in-line symptomatic diseases: ① . The wet back tile area is inspected and if the recirculation zone is too long, the large size wet back tile can be replaced. ② . The spacing between the edge line of the lip brick and the current-limiting brick is checked, the spacing is overlarge, the position of the current-limiting brick can be adjusted, the front section part of the novel current-limiting brick is pushed inwards, and the opening of the rear section is reduced, so that the spacing is reduced.
Claims (2)
1. The molten glass steady flow control mechanism is suitable for the molten tin bath inlet of the special glass float process and is provided with a flashboard arranged in a runner at the tail end of a melting furnace; the flashboard is perpendicular to the flowing direction of the molten glass, and a gap for flowing the molten glass is formed between the lower end face of the flashboard and the bottom face of the flow passage at the tail end of the melting furnace; the rear end of the melting furnace tail end runner is provided with a lip brick; the lip brick outlet nose end is arranged in an inclined cambered surface, is positioned above the tin bath inlet, and forms a combined liquid flow channel A with the side wall brick I; the method is characterized in that: the rear end of the side wall brick I is provided with a side wall brick II which is jointed with the side wall brick I; flow limiting bricks are arranged on two sides of the tin bath inlet; the flow limiting bricks are obliquely arranged from the lip bricks backwards and outwards; the front ends of the flow limiting bricks at both sides are respectively attached to wet back bricks which are arranged in a tin bath below the lip bricks and are close to the front end wall of the tin bath, and the flow limiting bricks are of a movable two-section cambered surface connection combined structure; glass liquid flowing back from the wet back area in the channel between the flow limiting bricks on two sides and the inner side surfaces of the two side walls of the lip brick forms glass edges; the rear end of the side wall brick II is provided with a lintel brick which is parallel to the flashboard; the lintel brick is positioned above the tin bath, and a channel for flowing glass liquid is arranged between the lintel brick and the bottom surface of the tin bath; a combined liquid flow channel B with an opening at the upper end is formed among the flow limiting bricks, the side wall bricks II and the lintel bricks at the two sides; a cover plate brick is arranged above the combined liquid flow channel B; a 0-shell sealing space is formed among the cover plate bricks, the side wall bricks II and the lintel bricks, N2 gas is introduced into the space during the production of conventional float glass, and the pollution of tin liquor after the outside air enters the tin bath space is effectively prevented through the gas seal effect; when special glass is produced, an electric heating silicon carbide rod is arranged in the sealing space; the electric heating silicon carbide rods are arranged in a staggered manner from top to bottom, and are obliquely arranged from top to bottom; an electric heating silicon carbide rod is arranged between the lip brick and the wet back brick; adopting a heating mode of an electric heating silicon carbide rod to slow down the cooling speed; in a molten glass steady flow control mechanism of a tin bath inlet of a special glass float process, the control of the depth H 1 of a front runner of a flashboard needs to satisfy the formula 1:
In the formula 1, G is the flow rate t/d of glass liquid, ρ is the density G/cm 3,W* of the glass liquid, the width of the lip brick is mm, and V Flow of is the flow rate mm/s of the glass liquid at the outlet of the flow channel; the stability of production flow control is considered, the selection range of the width W of the flow channel outlet is 400-650 mm, and the flow velocity V of the glass liquid at the flow channel outlet is Flow of -6 mm/s; in the glass liquid steady flow control mechanism of the tin bath inlet of the special glass float process, the distance H 2 of the lip brick from the tin liquid surface is required to meet the requirement of H 2 = 60-65 mm; the distance between the lip brick and the wet back brick, namely the length L of the backflow area, is 100-140 mm; the distance between the lip brick and the flow limiting brick is the reverse distance b=55 to 65mm.
2. The molten glass steady flow control mechanism for a tin bath inlet of a special glass float process as claimed in claim 1, wherein: the diameter of a single electric heating silicon carbide rod is 50-80 mm; the number of the electrically heated silicon carbide rods in the 0-shell sealed space above the combined liquid flow channel B is 3-5 in balance and the total power is 60-80 kw according to the change trend of the viscosity of glass along with the temperature and the sectional area of the wall brick II of 0 Bei Ce.
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| JPH06227830A (en) * | 1993-02-05 | 1994-08-16 | Asahi Glass Co Ltd | Production apparatus for float glass |
| CN1289417C (en) * | 2003-09-28 | 2006-12-13 | 洛阳玻璃股份有限公司 | Method of sealing in small spatial obstructs at entrance end of tin pot in product line float glass, and seal structure |
| CN2743342Y (en) * | 2004-06-25 | 2005-11-30 | 中国洛阳浮法玻璃集团有限责任公司 | Sealing structure of tin glove inlet of ultrathin glass production line |
| CN102786204B (en) * | 2011-05-19 | 2015-01-21 | 信义电子玻璃（芜湖）有限公司 | Method and device for controlling glass liquid flowing stability in float glass production |
| JP2016153344A (en) * | 2013-06-20 | 2016-08-25 | 旭硝子株式会社 | Method and apparatus for manufacturing float glass, and float glass |
| CN105217936B (en) * | 2014-07-28 | 2018-06-01 | 信义电子玻璃（芜湖）有限公司 | Adjustable front arch structure and floatation glass production line |
| CN105859110A (en) * | 2016-05-12 | 2016-08-17 | 武汉理工大学 | Method of improving and stabilizing quality of glass and lip brick for float glass production |
| CN109052915B (en) * | 2018-09-27 | 2021-07-27 | 信义玻璃（营口）有限公司 | Float glass flow control device and installation method thereof |
| CN110451779A (en) * | 2019-07-19 | 2019-11-15 | 四川旭虹光电科技有限公司 | Glass tin tank heating structure |
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