CN111170618A - Glass liquid steady flow control mechanism of molten tin bath inlet suitable for special glass float process - Google Patents
Glass liquid steady flow control mechanism of molten tin bath inlet suitable for special glass float process Download PDFInfo
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- CN111170618A CN111170618A CN201911180312.4A CN201911180312A CN111170618A CN 111170618 A CN111170618 A CN 111170618A CN 201911180312 A CN201911180312 A CN 201911180312A CN 111170618 A CN111170618 A CN 111170618A
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- 239000011521 glass Substances 0.000 title claims abstract description 155
- 239000007788 liquid Substances 0.000 title claims abstract description 81
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 238000006124 Pilkington process Methods 0.000 title claims abstract description 29
- 239000011449 brick Substances 0.000 claims abstract description 190
- 239000006060 molten glass Substances 0.000 claims abstract description 33
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 25
- 238000002844 melting Methods 0.000 claims abstract description 16
- 230000008018 melting Effects 0.000 claims abstract description 16
- 238000005485 electric heating Methods 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000005329 float glass Substances 0.000 claims description 14
- HMDDXIMCDZRSNE-UHFFFAOYSA-N [C].[Si] Chemical compound [C].[Si] HMDDXIMCDZRSNE-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 238000009736 wetting Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 description 8
- 239000005388 borosilicate glass Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000007667 floating Methods 0.000 description 5
- 230000003287 optical effect Effects 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
- 238000005498 polishing Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000010992 reflux Methods 0.000 description 3
- 238000012827 research and development Methods 0.000 description 3
- 238000003892 spreading Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910001563 bainite Inorganic materials 0.000 description 2
- 238000005352 clarification Methods 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
- 238000000465 moulding Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000002636 symptomatic treatment Methods 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012769 display material Substances 0.000 description 1
- 238000007496 glass forming Methods 0.000 description 1
- 125000001967 indiganyl group Chemical group [H][In]([H])[*] 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- 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
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- 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 production, and provides a molten glass steady flow control mechanism suitable for a tin bath inlet of a special glass float process. The glass liquid steady flow control mechanism of the tin bath inlet suitable for the special glass float process is provided with a flashboard arranged in a flow passage at the tail end of a melting furnace; the rear end of a flow passage at the tail end of the melting furnace is provided with a lip brick; the lip brick is positioned above the tin bath inlet, and a combined liquid flow channel A is formed between the lip brick and 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 inlet of the molten tin bath are provided with two-section type current-limiting bricks connected with arc 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 flow limiting bricks at the two sides, 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 among the cover plate brick, the side wall brick II 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 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
At present, special glass produced by using a small float process in the glass research and development field mainly comprises high alumina silica glass, high borosilicate glass and the like.
As a novel display material, the high-alumina-silica glass is mainly used in the field of touch screens of smart phones, tablet computers, touch control integrated machines and the like, and as a touch screen product, China consumes a large number of households, and most of the glass products are imported in the past.
The high borosilicate glass has good optical and electrical properties and very low thermal expansion coefficient, and can work for a long time at a high temperature of 450 ℃. With the emergence of float plate borosilicate glass, the use field of the borosilicate glass is further expanded, such as novel high-grade science and technology and safety fields of LCD projector protective cover plates, heat-resistant glass panels of outdoor large-scale lamps, heat-resistant glass table tops, high-grade bulletproof glass, high-grade fireproof glass and the like.
Compared with common float glass, the special glass such as high-alumina-silica glass, high-borosilicate glass and the like has the most outstanding characteristics of high melting temperature, high viscosity and high refractoriness, belongs to the leading-edge technology of the high-point field, strictly keeps the foreign technology secret, and lacks successful technical reference for late domestic research and initiation. The tonnage of the production line should not be too large in order to guarantee its glass quality. The tonnage of the float line of high-quality special glass produced at home and abroad is generally 30-100 t/d.
China is used as a birth place of the Luoyang float glass process which is one of three major float glass processes in the world to produce general AL2O3About 1.2 percent of large and medium float glass lines mainly comprising building glass and automobile glass are close to 400, and the production process technology of the conventional soda-lime-silica float glass with the thickness of 3-15mm is mastered. If the float process technology is successfully expanded to AL2O3The technical field of high-alumina-silica-high-borosilicate glass production, which achieves 4-20 percent, higher melting temperature, higher glass forming viscosity, larger production variety and thickness span of 0.3-8mm and higher forming control difficulty, has a profound influence on the technical upgrading of float glass in China.
At present, the float glass with great strength in ChinaDepartment and scientific research institute, etc. are actively developing and building small float glass to produce special float glass. As the production line generally has the characteristics of small tonnage of 30-50t/d, large adjustable range of output of nearly 50%, large span of variation of production varieties and thickness of 0.3-8mm, high production control difficulty and the like, the perfected successful production technical experience and reasonable and fine process design are still gradually searched and sought. Due to AL in the glass2O3The higher the content is, the higher the glass melting and forming viscosity is, besides the defects that the temperature control of a melting furnace clarification channel is unbalanced, the clarification is insufficient and micro bubbles are left to be highlighted, the forming defects of large glass surface waviness, prominent surface micro-wrinkles, difficult glass flattening and polishing, large optical deformation of a plate surface, drifting of fixed wet back ribs at two edges of the glass to the inside of an effective glass plate surface and the like caused by temperature-viscosity nonuniformity due to imperfect configuration of a forming tin bath inlet liquid flow channel are more prominent, the production quality and yield of special high-alumina-silica-silicon and high-borosilicate glass are seriously influenced, and the glass becomes a bottleneck restricting the production technology of special float glass to obtain great breakthrough.
The reasonable fine design configuration and the thermal state fine maintenance exploration of the key part structure at the joint of the channel outlet of the special glass small float glass kiln and the inlet of the forming tin bath become the first tasks which are urgently 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 takes the process analysis of the production liquid flow form of the lip brick part at the key part of the joint of the passage outlet of the high-aluminum-silicon float glass kiln and the inlet of the molding tin bath as the entry point, and aims at the glass AL2O3The high content causes the protruding molding of 'large waviness of the glass surface, prominent surface micro-wrinkles, drifting of the fixed wet back line at the edge of the glass to the inside of the 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 likeAnd the structural design and the process configuration of the lip brick part are gradually optimized by adopting a research and development idea combining theory and practice, so that the forming defects are effectively controlled and alleviated, and the glass quality and the finished product rate are improved.
The invention adopts the following technical scheme for achieving the purpose:
a glass liquid steady flow control mechanism suitable for the tin bath inlet of the special glass float process, the glass liquid steady flow control mechanism has flashboards arranged in the terminal flow passage of the melting furnace; the flashboard is arranged perpendicular to the flow direction of the molten glass, and a gap for flowing the molten glass is formed between the lower end surface of the flashboard and the bottom surface of a flow channel 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 as an inclined cambered surface, the lip brick is positioned above the tin bath inlet, and a combined liquid flow channel A is formed between the lip brick and 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; flow-limiting bricks are arranged on two sides of the molten tin bath inlet; the flow limiting brick is arranged backwards and outwards obliquely from the lip brick; the front ends of the flow limiting bricks on the two sides are attached to a back wetting brick 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 flow limiting bricks are of a novel movable two-section type cambered surface connection combined structure; glass liquid reflowing from the wet back area in a channel between the flow limiting bricks on two sides and the inner side surfaces of two side walls of the lip brick forms a glass edge; the rear end of the side wall brick II is provided with a lintel brick arranged in parallel to the flashboard; the lintel brick is positioned above the tin bath, and a channel for glass liquid to flow 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 at the two sides, the side wall bricks II and the lintel bricks; a cover plate brick is arranged above the combined liquid flow channel B; a0-shellfish sealed space is formed among the cover plate brick, the side wall brick II and the lintel brick, and N is introduced into the space during the production of the conventional float glass2The gas effectively prevents the outside air from polluting the tin liquid after entering the space of the tin bath through the gas sealing effect; when the special glass is produced, an electric heating silicon carbide rod is arranged in the sealed space; the electrical heating silicon carbide rods are arranged in a staggered manner from top to bottom, and the electrical heating silicon carbide rods are arranged in a staggered manner from top to bottomThe silicon carbide rods 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 a supplementary heating mode of an electric heating silicon carbide rod is adopted, so that the cooling speed is reduced.
In the glass liquid steady flow control mechanism at the inlet of the tin bath of the special glass float method, the depth H of the flow channel in front of the flashboard1The control needs to satisfy equation 1:
in formula 1, G is the molten glass flow rate t/d, ρ is the molten glass density G/cm3, and W is*The width of the lip brick is mm, VFlow ofThe flow rate of molten glass at the outlet of the flow channel is mm/s; considering the stability of the control of the production liquid flow, the selection range of the width W of the flow channel outlet is 400-650 mm, and the flow velocity V of the molten glass at the flow channel outletFlow ofAnd the concentration is 3-6 mm/s.
In the glass liquid steady flow control mechanism at the inlet of the tin bath of the special glass float process, the distance H between the lip brick and the tin liquid surface2The value of the letter should satisfy H2*=60~65mm。
The distance between the lip brick and the wet back brick, namely the value range of the length L of the backflow area is 100-140 mm.
The distance between the lip brick and the current limiting brick is reverse distance B = 55-65 mm.
The diameter of each electric heating silicon-carbon rod is 50-80 mm; the number of the electrically heated silicon-carbon rods in the combined liquid flow channel B is 3-5 according to the variation trend amplitude of the viscosity of the glass along with the temperature and the sectional area of the 0-Bei side wall, 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 float process, which starts from the mass conservation and the flow form rule of hydromechanics and combines the production practice to provide the special runner lip brick part structure design and process configuration suitable for the special glass float line, so that the molten glass flow form of the lip brick part of the special glass with high viscosity, large span variety range and small float line is in a controllable and adjustable steady flow state: the method comprises the following specific steps:
1. adding correction coefficient, rationalizingH of arrangement1And W is the flow channel and the lip brick channel, so that when the molten glass from the melting furnace passes through the flow regulating flashboard, the kinetic energy requirement of the small-flow molten glass can be met under the state of sufficient pressure difference.
2. Reasonably set H2In a 0-shell sealed space formed by the cover plate brick, the side wall brick II and the tin lintel brick, a 0-shell space silicon carbon rod with certain power is specially added for special glass to electrically heat, so that the temperature difference of the inner layer and the outer layer of the glass liquid is reduced, and the flattening and polishing quality of the surface of the glass liquid is improved; in the upper space of the wetback brick at the lower part of the lip brick, the electrical heating strengthening 'high viscosity and small flow' float glass liquid reflux quantity of a silicon carbon rod in the wetback area is increased, so that when glass liquid flows through a combined liquid flow channel formed by the lip brick and a side wall brick I of the lip brick, a small amount of glass liquid which is in contact with the lip brick, is polluted by refractory materials and is rich in refractory material oxides flows out of the nose end of the lip brick, and the glass liquid which is separated from the forward flowing glass liquid flows towards the direction of the wetback brick, thereby forming reasonably controlled wetback flow with certain kinetic energy and viscosity requirements; then wet back flow can flow to both sides along wet back brick naturally, later through lip brick's sideline and the novel movable current-limiting brick between the reasonable channel B region that sets up with the lip brick under good glass liquid advance the flow join, and then form as far as possible and be close to the glass tape edge portion and lie in the wet back line of being cut out the limit within range. The movable novel flow-limiting brick is of a two-section type cambered surface connection combined structure and has the characteristics of flexibly adjusting the opening degree, the flow-limiting length in the glass liquid flowing process and the subsequent epitaxial flowing angle and facilitating thermal state replacement. Therefore, the polluted glass liquid contacting the runner lip brick forms the edge of the glass due to the controllable backflow effect, so that the defects are concentrated on the edge of the glass and removed in the process of cutting and removing the edge of the glass, and the quality of the glass and the assembly yield are ensured; meanwhile, the invention utilizes the supplementary heating of the silicon carbide rod between 0 Bei to slow down the temperature difference of the inner layer and the outer layer of the glass liquid, keeps the stable flow state of the good glass liquid of the upper layer and the middle layer in the lip brick channel to form the lower surface and the upper surface of the glass belt within the range of the final effective qualified plate width, and improves the surface quality of the glass.
In conclusion, the invention effectively controls and alleviates the outstanding forming defects of large glass surface waviness, prominent surface micro-wrinkles, drifting of a fixed wet back line at the edge of the special glass towards the inside of the 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 a plate surface and the like, and improves the quality and the yield of the glass.
Drawings
FIG. 1 is a schematic diagram of the structure of a special small float channel lip brick part and the glass flow.
Fig. 2 is a sectional view taken along line I-I of fig. 1.
In the figure: 1. flashboard, 2, lip brick, 3, side wall brick I, 4, wet back brick, 5, current limiting brick, 6, 0 shell cover plate, 7, side wall brick II, 8, lintel brick, 9 and electrical heating silicon carbide rod.
Detailed Description
The invention will be described with reference to the accompanying drawings and specific examples, in which reference is made to the front and rear ends in the rear direction of the glass flow;
as shown in figures 1 and 2, the molten glass steady flow control mechanism of a tin bath inlet suitable for a special glass float process is provided with a gate plate 1 arranged in a flow passage at the tail end of a melting furnace; the gate plate 1 is arranged perpendicular to the flowing direction of the molten glass, and a gap for flowing the molten glass is formed between the lower end surface of the gate plate 1 and the bottom surface of a flow channel 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 as an inclined cambered surface, the lip brick 2 is positioned above the tin bath inlet, and a combined liquid flow channel A is formed between the lip brick 2 and 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 I3; two sides of the tin bath inlet are provided with flow-limiting bricks 5; the flow limiting brick 5 is obliquely arranged backwards and outwards from the lip brick; the front ends of the flow limiting bricks 5 on the two sides are 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 flow limiting bricks 5 are of a novel movable two-section cambered surface connection combined structure; glass liquid reflowing from the wet back area in a channel (B region) between the flow limiting bricks 5 at two sides and the inner side surfaces of two side walls of the lip brick 2 forms a glass edge; the rear end of the side wall brick II 7 is provided with a lintel brick 8 arranged in parallel to the flashboard; the lintel brick 8 is positioned above the tin bath, and a channel for glass liquid to flow is arranged between the lintel brick 8 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 at the two sides, the side wall bricks II 7 and the lintel bricks 8; a cover plate brick 6 is arranged above the combined liquid flow channel B; a 0-shell sealed 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 the conventional float glass, and the external air is effectively prevented from polluting tin liquid after entering the space of the tin bath through the gas sealing effect; when the special glass is produced, an electric heating silicon carbide rod 9 is arranged in the sealed space; the electrical heating silicon carbide rods 9 are arranged in a staggered manner from top to bottom, and the electrical 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 a supplementary heating mode of an electric heating silicon carbide rod is adopted, so that the cooling speed is reduced.
In the glass liquid steady flow control mechanism at the inlet of the tin bath of the special glass float method, the depth H of the flow channel in front of the flashboard1The control needs to satisfy equation 1:
in formula 1, G is the molten glass flow rate t/d, ρ is the molten glass density G/cm3, and W is*The width of the lip brick is mm, VFlow ofThe flow rate of molten glass at the outlet of the flow channel is mm/s; 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 of the molten glass at the flow channel outletFlow ofIs 3 to 6mm/s.
In the glass liquid steady flow control mechanism at the inlet of the tin bath of the special glass float process, the distance H between the lip brick and the tin liquid surface2The value of the letter should satisfy H2= 60-65 mm; the distance between the lip brick and the tin liquid level is H according to the experience of the general conventional floating normal line2And = 65-70 mm. Distance H between lip brick and tin liquid level2The free falling path of the molten glass is determined, the production capacity is large, the flow rate of the molten glass is large, and the suspension height is correspondingly increased; when the suspension height of the glass liquid is too small, the backflow is inhibited,the glass liquid spreads backwards on the bottom surface of the flow groove to form retention, crystallization is easy to generate, and the glass liquid is not beneficial to flowing. The suspension height of the glass liquid is too large, the free flow of the glass is unstable, and wrinkles and folding bubbles are generated. Aiming at the small floating normal line of the special glass, the small flow and the high viscosity are considered, and the distance between the corresponding lip brick and the tin liquid level takes the value H2*=60~65mm。
The distance between the lip brick and the wet back brick, namely the value range of the length L of the backflow area is 100-140 mm; the length L = 140-200 mm of the reflux zone of the general normal floating line. If the distance is too large, wet back flow is increased, so that a wet back line moves inwards, the width of the edge to be cut is increased, and the yield is influenced; if the distance is too small, the glass liquid is stretched into the short space, the backflow of the glass liquid is limited, and the glass liquid with impurities cannot be shunted to the natural edge, so that the quality of the plate surface is influenced. However, for the small float line of the special glass, because the viscosity of the glass is high, when the glass liquid flows down from the lip brick, the kinetic energy naturally spreading outwards from the falling point is insufficient, and because the width B of the lip brick is small, the proper backflow of the glass liquid is considered, the length of a backflow area can be properly reduced, and the value range L = 100-140 mm according to physical simulation and practical experience; meanwhile, the electrical heating of a silicon carbide rod is added in the wet back area to supplement heat, so that the backflow effect of the high-viscosity and small-flow glass liquid is strengthened.
The distance between the lip brick and the current limiting brick is reverse distance B = 55-65 mm; the general floating line is normally produced by 3-12 mm glass, the distance (reverse distance) B between the lip brick and the current-limiting brick has no special requirement, but when an electronic glass production line with the thickness of less than 3mm is produced, the importance of the distance B between the lip brick and the current-limiting brick is highlighted: the distance is too small, so that the wet back flow is blocked from flowing forwards, and impurities and crystallization on the lower surface of the glass are easy to appear; the spacing is too large, the wet back line moves inwards, the width of the edge needing to be cut is increased, and the rate of finished products is influenced.
Aiming at the special glass float method, when the glass liquid flow with small flow flows down from the lip brick due to large viscosity, the kinetic energy naturally spreading outwards from the total falling point is insufficient, the backflow amount of the glass liquid is small, the outstanding problem is that the glass liquid and the flow-limiting brick are possibly in a separated state, relatively speaking, the distance between the two side boundaries of the lip brick and the flow-limiting brick is large, the effect of the flow-limiting brick is weakened, therefore, on one hand, heating measures of a silicon carbide rod 9 can be added in the space above the lip brick 2 and a wet back area as shown in figures 1 and 2, the reflux quantity of glass liquid and the outward spreading kinetic energy of the glass liquid at the falling point of a tin bath are strengthened, on the other hand, a two-section type cambered surface connection combined novel movable current-limiting brick 5 can be adopted as shown in figure 2, the opening and the inclination angle of the flow limiting brick 5 can be flexibly adjusted, and repeated practical verification is carried out for many times, so that the distance (namely the reverse distance) B = 55-65 mm between the boundary of the special glass small floating normal lip brick and the flow limiting brick is reasonable.
The defects of large waviness of the glass surface, prominent surface micro-wrinkles and large optical deformation of the glass surface are caused by small heat brought by small-tonnage molten glass, large cooling speed block of the upper surface of the glass when the high-alumina glass flows through a kiln passage and a lip brick part, large temperature gradient in the thickness direction and large viscosity increase amplitude. In this case, the normal float line of N2 gas introduced into the 0-beta space is obviously not suitable, but rather, the surface cooling of the high alumina glass is increased, and the degree of surface waviness and wrinkle defects of the glass are increased. Therefore, when the small-tonnage high-alumina glass is produced, N2 gas introduced into the zero-bainite space needs to be cut off, meanwhile, the heating mode of the silicon carbide rod shown in the figures 1 and 2 is adopted, the cooling speed is reduced, holes which can penetrate through the silicon carbide rod 9 are reserved on the side wall brick II 7 of the zero-bainite space, the shape of glass liquid flowing into a tin bath from a lip brick can be preferably conformed, and the side wall brick II is obliquely arranged from top to bottom. The holes 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 glass quality is improved; n2 gas can be properly introduced when producing glass with low viscosity, so as to prevent the tin bath from being polluted by outside air.
Considering the above consideration factors and considering the strength problem of a single silicon carbide rod, the diameter of the silicon carbide rod increased by 0 shellfish space is generally 50-80 mm due to the length of about 2000 mm; the number of the silicon carbide rods with the space of 0 shell increased is 3-5 according to the trend amplitude of the viscosity of the glass along with the temperature change and the size of the sectional area of the side wall brick II with the space of 0 shell, and the total power of 60-80 kw is reasonable.
"fixing of glass edge portionThe defects that the wet back line drifts towards the inside of the effective glass and the small open bubbles or closed bubbles are generated on the lower surface of the glass are both caused by the characteristic factors of small production liquid flow, small heat brought by the glass, large viscosity and the like of a special glass small-tonnage production line, and relatively speaking, the height H from a lip brick arranged by adopting the general float process experience to the tin liquid level2The back flow area L in the back wet brick area is relatively overlong, the distance B between the edge line of the lip brick and the flow limiting brick is relatively overlarge, and the prominent phenomena of low temperature of the back wet area and small glass liquid backflow are further shown. It is usually on one side of the ribbon, but sometimes extends halfway across the ribbon. On the other hand, the small backflow of the molten glass can cause the wet back line to move inwards, and the glass yield is influenced.
And (3) performing symptomatic treatment on small bubbles on the lower surface of the glass: the temperature of the flow channel is increased to ensure good sealing around the wet back area, a silicon carbon rod heater is additionally arranged in the space of the upper area of the wet back brick to strengthen the back lining backflow liquid, so that the stagnation of the glass liquid in the backflow area is weakened, and the normal glass liquid flow of the wet back area is ensured.
the wet back line is moved inwards to take symptomatic treatment measures, namely, firstly, the area of the wet back brick is checked, if the backflow area is too long, the large-size wet back brick can be replaced, secondly, the distance between the edge line of the lip brick and the current-limiting brick is checked, the distance is too large, 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 degree of the rear section is reduced, so that the distance is reduced.
Claims (6)
1. A glass liquid steady flow control mechanism suitable for the tin bath inlet of the special glass float process, the glass liquid steady flow control mechanism has flashboards arranged in the terminal flow passage of the melting furnace; the flashboard is arranged perpendicular to the flow direction of the molten glass, and a gap for flowing the molten glass is formed between the lower end surface of the flashboard and the bottom surface of a flow channel 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 as an inclined cambered surface, the lip brick is positioned above the tin bath inlet, and a combined liquid flow channel A is formed between the lip brick and 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 attached to the side wall brick I; flow-limiting bricks are arranged on two sides of the molten tin bath inlet; the flow limiting brick is arranged backwards and outwards obliquely from the lip brick; the front ends of the flow limiting bricks on the two sides are attached to a back wetting brick 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 flow limiting bricks are of a movable two-section cambered surface connection combined structure; glass liquid reflowing from the wet back area in a channel between the flow limiting bricks on two sides and the inner side surfaces of two side walls of the lip brick forms a glass edge; the rear end of the side wall brick II is provided with a lintel brick arranged in parallel to the flashboard; the lintel brick is positioned above the tin bath, and a channel for glass liquid to flow 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 at the two sides, the side wall bricks II and the lintel bricks; a cover plate brick is arranged above the combined liquid flow channel B; a 0-shell sealed space is formed among the cover plate brick, the side wall brick II and the lintel brick, N2 gas is introduced into the space during the production of the conventional float glass, and the external air is effectively prevented from polluting tin liquor after entering the tin bath space through the gas sealing effect; when the special glass is produced, an electric heating silicon carbide rod is arranged in the sealed space; the electrical heating silicon carbon rods are arranged in staggered layers 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; the heating mode of electrically heating the silicon carbide rod is adopted, and the cooling speed is reduced.
2. The molten glass steady flow control mechanism of the tin bath inlet suitable for the special glass float process as claimed in claim 1, wherein: in the glass liquid steady flow control mechanism at the inlet of the tin bath of the special glass float method, the depth H of the flow channel in front of the flashboard1The control needs to satisfy equation 1:
in formula 1, G is the glass flow ratet/d, rho is the density of the glass liquid g/cm3，W*Is lip tile with width of mm and VFlow ofThe flow rate of molten glass at the outlet of the flow channel is mm/s; considering the stability of production flow control, the selection range of the width W of the outlet of the flow channel is 400-650 mm, and the flow velocity V of the molten glass at the outlet of the flow channelFlow ofIs 3 to 6mm/s.
3. The molten glass steady flow control mechanism of the tin bath inlet suitable for the special glass float process as claimed in claim 1, wherein: in the glass liquid steady flow control mechanism at the inlet of the tin bath of the special glass float process, the distance H between the lip brick and the tin liquid surface2The value of the letter should satisfy H2*=60~65mm。
4. The molten glass steady flow control mechanism of the tin bath inlet suitable for the special glass float process as claimed in claim 1, wherein: the distance between the lip brick and the wet back brick, namely the value range of the length L of the backflow area is 100-140 mm.
5. The molten glass steady flow control mechanism of the tin bath inlet suitable for the special glass float process as claimed in claim 1, wherein: the distance between the lip brick and the current limiting brick is reverse distance B = 55-65 mm.
6. The molten glass steady flow control mechanism of the tin bath inlet suitable for the special glass float process as claimed in claim 1, wherein: the diameter of each electric heating silicon-carbon rod is 50-80 mm; the number of the electrically heated silicon-carbon rods in the 0-shellfish sealed space above the combined liquid flow channel B is 3-5 according to the change trend amplitude of the viscosity of the glass along with the temperature and the sectional area of the 0-shellfish side wall brick II, and the total power is 60-80 kw.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113532695A (en) * | 2021-08-14 | 2021-10-22 | 中建材蚌埠玻璃工业设计研究院有限公司 | Tin bath physical simulation method suitable for float glass |
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